Digital video display system

Claim 2

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video drawing command for video display, and first digital interface means for transmitting the video drawing command; a display unit, including second digital interface means for receiving the video drawing command transmitted from said first digital interface means; drawing processing means for generating digital video data and a synchronizing signal from the received video drawing command; video memory means for temporarily storing the digital video data and for outputting the digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; and display means for displaying pictures based both on the analog video signal and on the synchronizing signal.

Claim 3

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video drawing command for video display and an audio processing command for audio reproduction, and first digital interface means for transmitting the video drawing command and the audio processing command; a display unit, including second digital interface means for receiving the video drawing command and the audio processing command transmitted from said first digital interface means; drawing processing means for generating digital video signal data and a synchronizing signal from the received video drawing command; video memory means for temporarily storing the digital video data and for later outputting the digital video data; first digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; display means for displaying pictures based both on the analog video signal and on the synchronizing signal; audio processing means for generating digital audio data in accordance with the received audio processing command; audio memory means for temporarily storing the digital audio data and for outputting the digital audio data; second digital-analog conversion means for converting the digital audio data output from said audio memory means into an analog audio signal; and audio output means for outputting audio based on the analog audio signal.

Claim 4

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video drawing command for video display and an audio processing command for audio reproduction, and first digital interface means for transmitting the video drawing command and the audio processing command; a display unit, including second digital interface means for receiving the video drawing command and the audio processing command transmitted from said first digital interface means; drawing processing means for generating digital video signal data and a synchronizing signal from the received video drawing command; video memory means for temporarily storing the digital video data and for later outputting the digital video data; first digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; display means for displaying pictures based both on the analog video signal and on the synchronizing signal; audio processing means for generating digital audio data in accordance with the received audio processing command; audio memory means for temporarily storing the digital audio data and for outputting the digital audio data; second digital-analog conversion means for converting the digital audio data output from said audio memory means into an analog audio signal; and audio output means for outputting audio based on the analog audio signal.

Claim 5

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video drawing command for video display and a switching control command for switching control, and first digital interface means for transmitting the video drawing command and the switching control command; a display unit including second digital interface means for receiving the video drawing command and the switching control command transmitted from said first digital interface means; first input means for receiving an external analog video signal; preprocessing means for clamping the received analog video signal and for extracting a synchronizing signal from the received analog video signal; clock generation means for generating and outputting a clock signal in phase synchronization with the extracted synchronizing signal; analog-digital conversion means for converting the clamped analog video signal into digital video data using the clock signal output from said clock generating means as a sampling clock signal; temporary storage means for temporarily storing the digital video data; second input means for receiving an external video processing command; switching control means for outputting a switching command based either on the switching control command received by said second digital interface means or on the received video processing command input; drawing processing means for onverting the received video drawing command into digital video data and a synchronizing signal and for selectively outputting either the converted digital video data or the temporarily stored digital video data in accordance with the switching command; video memory means for temporarily storing the digital video data output from said drawing processing means and for later outputting said digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; and display means for displaying pictures based both on the analog video signal and on the generated synchronizing signal from said drawing processing means.

Claim 6

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video drawing command for video display and a switching control command for switching control, and first digital interface means for transmitting the video drawing command and the switching control command; a display unit including second digital interface means for receiving the video drawing command and the switching control command transmitted from said first digital interface means; first input means for receiving an external analog video signal; preprocessing means for clamping the received analog video signal and for extracting a synchronizing signal from the received analog video signal; clock generation means for generating and outputting a clock signal in phase synchronization with the extracted synchronizing signal; analog-digital conversion means for converting the clamped analog video signal into digital video data using the clock signal output from said clock generating means as a sampling clock signal; temporary storage means for temporarily storing the digital video data; second input means for receiving an external video processing command; switching control means for outputting a switching command based either on the switching control command received by said second digital interface means or on the received video processing command input; drawing processing means for onverting the received video drawing command into digital video data and a synchronizing signal and for selectively outputting either the converted digital video data or the temporarily stored digital video data in accordance with the switching command; video memory means for temporarily storing the digital video data output from said drawing processing means and for later outputting said digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; and display means for displaying pictures based both on the analog video signal and on the generated synchronizing signal from said drawing processing means.

Claim 7

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video drawing command for video display and a switching control command for switching control, and first digital interface means for transmitting the video drawing command and the switching control command; a display unit, including second digital interface means for receiving the video drawing command and the switching control command transmitted from said first digital interface means; first input means for receiving an external video processing command; switching control means for outputting a switching command based either on the switching control command or on the video processing command; second input means for receiving an external synchronizing signal; drawing processing means for converting the video drawing command into digital video data and to a second synchronizing signal in accordance with the switching command and in either synchronism or asynchronism with the received synchronizing signal, said drawing processing means further outputting a selection signal in accordance with the switching command; video memory means for temporarily storing the digital video data and for outputting said digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; selection means for selecting and outputting one of two analog video signals in accordance with the second selection signal, one of the two analog video signals being the external analog video signal along with the external synchronizing signal, the other of the two analog video signals being the analog video signal output by said digital-analog conversion means; and display means for displaying pictures based both on the analog video signal output by said selection means and on the synchronizing signal generated by said drawing processing means.

Claim 8

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video drawing command for video display and a switching control command for switching control, and first digital interface means for transmitting the video drawing command and the switching control command; a display unit, including second digital interface means for receiving the video drawing command and the switching control command transmitted from said first digital interface means; first input means for receiving an external video processing command; switching control means for outputting a switching command based either on the switching control command or on the video processing command; second input means for receiving an external synchronizing signal; drawing processing means for converting the video drawing command into digital video data and to a second synchronizing signal in accordance with the switching command and in either synchronism or asynchronism with the received synchronizing signal, said drawing processing means further outputting a selection signal in accordance with the switching command; video memory means for temporarily storing the digital video data and for outputting said digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; selection means for selecting and outputting one of two analog video signals in accordance with the second selection signal, one of the two analog video signals being the external analog video signal along with the external synchronizing signal, the other of the two analog video signals being the analog video signal output by said digital-analog conversion means; and display means for displaying pictures based both on the analog video signal output by said selection means and on the synchronizing signal generated by said drawing processing means.

Claim 9

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video drawing command for video display, and first digital interface means for transmitting the video drawing command; a display unit, including second digital interface means for receiving the video drawing command transmitted from said first digital interface means; drawing processing means for generating digital video data and a synchronizing signal from the received video drawing command; video memory means for temporarily storing the digital video data and for outputting the digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; display means for displaying pictures based both on the analog video signal and on the synchronizing signal; first input means adapted for connection to an external sensor for receipt of a detection signal; analog-digital conversion means connected to said first input means for detecting and outputting the display status of said display means, said analog-digital conversion means converting the detection signal into digital detection data; operation means for generating characteristic data about said display unit on the basis of the digital detection data; memory means for temporarily storing the characteristic data and for outputting the characteristic data; and means for transmitting the characteristic data output from said memory means to said digital data output unit via said drawing processing means and said second digital interface means.

Claim 10

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video drawing command for video display, and first digital interface means for transmitting the video drawing command; a display unit, including second digital interface means for receiving the video drawing command transmitted from said first digital interface means; drawing processing means for generating digital video data and a synchronizing signal from the received video drawing command; video memory means for temporarily storing the digital video data and for outputting the digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; display means for displaying pictures based both on the analog video signal and on the synchronizing signal; first input means adapted for connection to an external sensor for receipt of a detection signal; analog-digital conversion means connected to said first input means for detecting and outputting the display status of said display means, said analog-digital conversion means converting the detection signal into digital detection data; operation means for generating characteristic data about said display unit on the basis of the digital detection data; memory means for temporarily storing the characteristic data and for outputting the characteristic data; and means for transmitting the characteristic data output from said memory means to said digital data output unit via said drawing processing means and said second digital interface means.

Claim 11

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video display command; drawing processing means for generating digital video data and synchronizing signal data based on the video display command; data compression means for compressing the digital video data to provide compressed video data; and first digital interface means for transmitting both the compressed video data and the synchronizing signal data; a display unit including second digital interface means for receiving the compressed video data and the synchronizing signal data transmitted from said first digital interface means; data decompression means for decompressing the received compressed video data to provide the initial digital video data, said data decompression means further generating a synchronizing signal from the received synchronizing signal data; video memory means for temporarily storing the digital video data provided by said data decompression means and for outputting the digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; and display means for displaying pictures based on the analog video signal and the synchronizing signal generated by said data decompression means.

Claim 12

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video display command; drawing processing means for generating digital video data and synchronizing signal data based on the video display command; data compression means for compressing the digital video data to provide compressed video data; and first digital interface means for transmitting both the compressed video data and the synchronizing signal data; a display unit including second digital interface means for receiving the compressed video data and the synchronizing signal data transmitted from said first digital interface means; data decompression means for decompressing the received compressed video data to provide the initial digital video data, said data decompression means further generating a synchronizing signal from the received synchronizing signal data; video memory means for temporarily storing the digital video data provided by said data decompression means and for outputting the digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; and display means for displaying pictures based on the analog video signal and the synchronizing signal generated by said data decompression means.

Claim 13

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video display command; drawing processing means for generating digital video data and synchronizing signal data based on the video display data; video memory means for temporarily storing the digital video data and for outputting the digital video data; data compression means for compressing the digital video data output from said video memory means to provide compressed video data; and first digital interface means for transmitting both the compressed video data and the synchronizing signal data; a display unit, including second digital interface means for receiving the compressed video data and the synchronizing signal data transmitted from said first digital interface means; data decompression means for decompressing the received compressed video data to provide the initial digital video data, said data decompression means further generating a synchronizing signal from the received synchronizing signal data; digital-analog conversion means coupled to said data decompression means for converting the digital video data output of said data decompression means into an analog video signal; and display means for displaying pictures based both on the analog video signal and on the generated synchronizing signal.

Claim 14

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video display command; drawing processing means for generating digital video data and synchronizing signal data based on the video display data; video memory means for temporarily storing the digital video data and for outputting the digital video data; data compression means for compressing the digital video data output from said video memory means to provide compressed video data; and first digital interface means for transmitting both the compressed video data and the synchronizing signal data; a display unit, including second digital interface means for receiving the compressed video data and the synchronizing signal data transmitted from said first digital interface means; data decompression means for decompressing the received compressed video data to provide the initial digital video data, said data decompression means further generating a synchronizing signal from the received synchronizing signal data; digital-analog conversion means coupled to said data decompression means for converting the digital video data output of said data decompression means into an analog video signal; and display means for displaying pictures based both on the analog video signal and on the generated synchronizing signal.

Claim 15

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video display command and a switching control command; drawing processing means for generating digital video data and synchronizing signal data based on the video display command and the switching control command; data compression means coupled to said drawing processing means for compressing the digital video data to provide compressed video data; and first digital interface means for transmitting the compressed video data, the synchronizing signal data, and the switching control command; a display unit, including second digital interface means for receiving the compressed video data, the synchronizing signal data, and the switching control command transmitted from the first digital interface means; first input means for receiving an external video processing command; switching control means for outputting a switching command based on either one of two commands, one of said two commands being the received switching control command, the other of said two commands being the received external video processing command; second input means for receiving a second synchronizing signal; data decompression means for decompressing the received compressed video data in accordance with the switching command output from said switching control means in either synchronism or asynchronism with the second synchronizing signal to provide the initial digital video data, said data decompression means further generating a third synchronizing signal from the synchronizing signal data received by said second digital interface means and outputting a selection signal in accordance with the switching command output from said switching control means; video memory means for temporarily storing the digital video data output from said data decompression means and for outputting the digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; third input means for receiving an external analog video signal; selection means for selecting and outputting one of two analog video signals in accordance with the selection signal, one of said two analog video signals being the received external analog video signal along with the second synchronizing signal, the other of said two analog video signals being the analog video signal output from said digital-analog conversion means; and display means for displaying pictures based both on the analog video signal output from said selection means and on the third synchronizing signal.

Claim 16

A digital video display system comprising: a digital data output unit, including a CPU for generating and outputting a video display command and a switching control command; drawing processing means for generating digital video data and synchronizing signal data based on the video display command and the switching control command; data compression means coupled to said drawing processing means for compressing the digital video data to provide compressed video data; and first digital interface means for transmitting the compressed video data, the synchronizing signal data, and the switching control command; a display unit, including second digital interface means for receiving the compressed video data, the synchronizing signal data, and the switching control command transmitted from the first digital interface means; first input means for receiving an external video processing command; switching control means for outputting a switching command based on either one of two commands, one of said two commands being the received switching control command, the other of said two commands being the received external video processing command; second input means for receiving a second synchronizing signal; data decompression means for decompressing the received compressed video data in accordance with the switching command output from said switching control means in either synchronism or asynchronism with the second synchronizing signal to provide the initial digital video data, said data decompression means further generating a third synchronizing signal from the synchronizing signal data received by said second digital interface means and outputting a selection signal in accordance with the switching command output from said switching control means; video memory means for temporarily storing the digital video data output from said data decompression means and for outputting the digital video data; digital-analog conversion means coupled to said video memory means for converting the digital video data output of said video memory means into an analog video signal; third input means for receiving an external analog video signal; selection means for selecting and outputting one of two analog video signals in accordance with the selection signal, one of said two analog video signals being the received external analog video signal along with the second synchronizing signal, the other of said two analog video signals being the analog video signal output from said digital-analog conversion means; and display means for displaying pictures based both on the analog video signal output from said selection means and on the third synchronizing signal.

Claim 17

A digital video display unit comprising input means adapted to be coupled to a digital data output unit for receiving therefrom a digital video drawing command for a video display, a video processor coupled to said input means for generating an analog video signal and synchronizing signals from the received digital video drawing command, a video circuit coupled to said video processor and responsive to the analog video signal for providing a video display signal, a driving circuit coupled to said video processor and responsive to the synchronizing signals for providing video deflection signals, and output means coupled to said video circuit and said driving circuit and adapted for connection to a video display device for applying the video display signal and the deflection signals to the video display device to cause on the video display device a video display in accordance with the digital video command.

Claim 18

A digital video display unit comprising input means adapted to be coupled to a digital data output unit for receiving therefrom a digital video drawing command for a video display, a video processor coupled to said input means for generating an analog video signal and synchronizing signals from the received digital video drawing command, a video circuit coupled to said video processor and responsive to the analog video signal for providing a video display signal, a driving circuit coupled to said video processor and responsive to the synchronizing signals for providing video deflection signals, and output means coupled to said video circuit and said driving circuit and adapted for connection to a video display device for applying the video display signal and the deflection signals to the video display device to cause on the video display device a video display in accordance with the digital video command.

Claim 19

A digital video display system comprising: a digital data output unit for providing a digital video drawing command for a video display; and a display unit, including input means coupled to said digital data output unit for receiving the digital video drawing command, a video processor coupled to said input means for generating an analog video signal and synchronizing signals from the received digital video drawing command, a video circuit coupled to said video processor and responsive to the analog video signal for providing a video display signal, a driving circuit coupled to said video processor and responsive to the synchronizing signals for providing video deflection signals, and output means coupled to said video circuit and said driving circuit and adapted for connection to a video display device for applying the video display signal and the deflection signals to the video display device to cause on the video display device a video display in accordance with the digital video drawing command.

Claim 20

A digital video display system comprising: a digital data output unit for providing a digital video drawing command for a video display; and a display unit, including input means coupled to said digital data output unit for receiving the digital video drawing command, a video processor coupled to said input means for generating an analog video signal and synchronizing signals from the received digital video drawing command, a video circuit coupled to said video processor and responsive to the analog video signal for providing a video display signal, a driving circuit coupled to said video processor and responsive to the synchronizing signals for providing video deflection signals, and output means coupled to said video circuit and said driving circuit and adapted for connection to a video display device for applying the video display signal and the deflection signals to the video display device to cause on the video display device a video display in accordance with the digital video drawing command.

Claim 21

A digital video display unit comprising: an interface circuit adapted to be coupled to a digital data output unit for receipt therefrom of a digital video signal; processing means for converting the digital video signal to an analog video signal and a synchronizing signal; a video circuit for receiving the analog video signal; a driving circuit for receiving the synchronizing signal; and a display device for displaying a video image in response to outputs from said video circuit and said driving circuit in accordance with the digital video signal.

Claim 22

A digital video display unit comprising: an interface circuit adapted to be coupled to a digital data output unit for receipt therefrom of a digital video signal; processing means for converting the digital video signal to an analog video signal and a synchronizing signal; a video circuit for receiving the analog video signal; a driving circuit for receiving the synchronizing signal; and a display device for displaying a video image in response to outputs from said video circuit and said driving circuit in accordance with the digital video signal.

Claim 23

A digital video display system comprising: a digital data output unit including a processor for generating a digital video signal, and a first interface circuit for transmitting the digital video signal; and a display unit including a second interface circuit for receiving the digital video signal from said digital data output unit, processing means for converting the digital video signal to an analog video signal and a synchronizing signal, a video circuit for receiving the analog video signal, a driving circuit for receiving the synchronizing signal, and a display device for displaying a video image in response to outputs from said video circuit and said driving circuit in accordance with the digital video signals.

Claim 24

A digital video display system comprising: a digital data output unit including a processor for generating a digital video signal, and a first interface circuit for transmitting the digital video signal; and a display unit including a second interface circuit for receiving the digital video signal from said digital data output unit, processing means for converting the digital video signal to an analog video signal and a synchronizing signal, a video circuit for receiving the analog video signal, a driving circuit for receiving the synchronizing signal, and a display device for displaying a video image in response to outputs from said video circuit and said driving circuit in accordance with the digital video signals.

Claim 25

A digital video display system as claimed in claim 1, wherein said digital-analog conversion means comprises a look-up table for translating the digital video data output of said video memory means into translated digital video data, and a digital-analog converter for converting the translated digital video data into the analog video signal.

Claim 26

A video display system as claimed in claim 2, wherein said first digital-analog conversion means comprises a look-up table for translating the digital video data output of said video memory means into translated digital video data, and a digital-analog converter for converting the translated digital video data into the analog video signal.

Claim 27

A digital video display system as claimed in claim 3, wherein said digital-analog conversion means comprises a look-up table for translating the digital video data output of said video memory means into translated digital video data, and a digital-analog converter for converting the translated digital video data into the analog video signal.

Claim 28

A digital video display system as claimed in claim 4, wherein said digital-analog conversion means comprises a look-up table for translating the digital video data output of said video memory means into translated digital video data, and a digital-analog converter for converting the translated digital video data into the analog video signal.

Claim 29

A digital video display system as claimed in claim 5, wherein said digital-analog conversion means comprises a look-up table for translating the digital video data output of said video memory means into translated digital video data, and a digital-analog converter for converting the translated digital video data into the analog video signal.

Claim 30

A digital video display system as claimed in claim 6, wherein said digital-analog conversion means comprises a look-up table for translating the digital video data output of said video memory means into translated digital video data, and a digital-analog converter for converting the translated digital video data into the analog video signal.

Claim 31

A digital video display system as claimed in claim 7, wherein said digital-analog conversion means comprises a look-up table for translating the digital video data output of said data decompression means into translated digital video data, and a digital-analog converter for converting the translated digital video data into the analog video signal.

Claim 32

A digital video display system as claimed in claim 8, wherein said digital-analog conversion means comprises a look-up table for translating the digital video data output of said video memory means into translated digital video data, and a digital-analog converter for converting the translated digital video data into the analog video signal.

Claim 33

A display unit, comprising: a digital data interface adapted to be coupled to digital equipment for receipt of digital data therefrom; a drawing processing circuit for generating digital video data and synchronizing signals in response to received digital data; a digital-analog converter for converting the digital video data from the drawing processing circuit into analog video signals; and a display device for displaying video images in response to the analog video signals and the synchronizing signals.

Claim 34

A display unit, comprising: a digital data interface adapted to be coupled to digital equipment for receipt of digital data therefrom; a drawing processing circuit for generating digital video data and synchronizing signals in response to received digital data; a digital-analog converter for converting the digital video data from the drawing processing circuit into analog video signals; and a display device for displaying video images in response to the analog video signals and the synchronizing signals.

Claim 35

A display unit, comprising: a digital data interface adapted to be coupled to digital equipment for receipt of digital data therefrom; a drawing processing circuit for generating digital video data and synchronizing signals in response to received digital data; a first digital-analog converter for converting the digital video data from said drawing processing circuit into analog video signals; a display device for displaying video images in response to the analog video signals and the synchronizing signals; an audio processing circuit for generating a digital audio signal in response to received digital data; a second digital-analog converter for converting the digital audio signal from said audio processing circuit into analog audio signals; and a speaker for providing an audio output in response to the analog audio signals.

Claim 36

A display unit, comprising: a digital data interface adapted to be coupled to digital equipment for receipt of digital data therefrom; a drawing processing circuit for generating digital video data and synchronizing signals in response to received digital data; a first digital-analog converter for converting the digital video data from said drawing processing circuit into analog video signals; a display device for displaying video images in response to the analog video signals and the synchronizing signals; an audio processing circuit for generating a digital audio signal in response to received digital data; a second digital-analog converter for converting the digital audio signal from said audio processing circuit into analog audio signals; and a speaker for providing an audio output in response to the analog audio signals.

Claim 37

A display unit, comprising: a digital data interface adapted to be coupled to digital equipment for receipt of digital data therefrom and transmission of digital data thereto; a drawing processing circuit for generating digital video data and synchronizing signals in response to received digital data; a digital-analog converter for converting the digital video data from said drawing processing circuit into analog video signals; a display device for displaying video images in response to the analog video signals and the synchronizing signals; a microphone for providing analog audio signals; an analog-digital converter for converting the analog audio signals from said microphone into digital audio signals; and an audio processing circuit for converting the digital audio signals into digital audio data and applying the digital audio data to said digital data interface for transmission of the digital audio data to the digital equipment.

Claim 38

A display unit, comprising: a digital data interface adapted to be coupled to digital equipment for receipt of digital data therefrom and transmission of digital data thereto; a drawing processing circuit for generating digital video data and synchronizing signals in response to received digital data; a digital-analog converter for converting the digital video data from said drawing processing circuit into analog video signals; a display device for displaying video images in response to the analog video signals and the synchronizing signals; a microphone for providing analog audio signals; an analog-digital converter for converting the analog audio signals from said microphone into digital audio signals; and an audio processing circuit for converting the digital audio signals into digital audio data and applying the digital audio data to said digital data interface for transmission of the digital audio data to the digital equipment.

Claim 39

A display unit, comprising: a first interface for receiving a first analog video signal; an analog-digital converter for converting the first analog video signal to a first digital video signal; a memory for storing the first digital video signal; a second interface adapted to be coupled to digital equipment for receiving digital data therefrom; a drawing processing circuit for generating a second digital video signal in response to the received digital data; a combining circuit for combining the first and second digital video signal signals to provide a combined digital video signal; a digital-analog converter for converting the combined digital video signal to a second analog video signal; and a display device for displaying video images in response to the second analog video signal.

Claim 40

A display unit, comprising: a first interface for receiving a first analog video signal; an analog-digital converter for converting the first analog video signal to a first digital video signal; a memory for storing the first digital video signal; a second interface adapted to be coupled to digital equipment for receiving digital data therefrom; a drawing processing circuit for generating a second digital video signal in response to the received digital data; a combining circuit for combining the first and second digital video signal signals to provide a combined digital video signal; a digital-analog converter for converting the combined digital video signal to a second analog video signal; and a display device for displaying video images in response to the second analog video signal.

Claim 41

A display unit as claimed in claim 24, wherein said combining circuit comprises a switching circuit.

Claim 42

A display unit, comprising: a first interface for receiving a first analog video signal, including a first synchronizing signal; a second interface adapted to be coupled to digital equipment for receiving digital data therefrom; a drawing processing circuit connected to said second interface for generating digital video data and a second synchronizing signal in response to the received digital data; a digital-analog converter for converting the digital video signal from said drawing processing circuit into a second analog video signal; a switching circuit having a first input connected to the first interface, to receive the first analog video signal and the first synchronizing signal, and a second input connected to the digital-analog converter, to receive the second analog video signal, and connected to the drawing processing circuit, to receive the second synchronizing signal, said switching circuit having an output and being capable of assuming alternatively a first state in which said first input is coupled to said output and a second state in which said second input is coupled to said output; and a display device connected to said switching circuit output for displaying video images in response to the first and second analog video signals and the first and second synchronizing signals.

Claim 43

A display unit, comprising: a first interface for receiving a first analog video signal, including a first synchronizing signal; a second interface adapted to be coupled to digital equipment for receiving digital data therefrom; a drawing processing circuit connected to said second interface for generating digital video data and a second synchronizing signal in response to the received digital data; a digital-analog converter for converting the digital video signal from said drawing processing circuit into a second analog video signal; a switching circuit having a first input connected to the first interface, to receive the first analog video signal and the first synchronizing signal, and a second input connected to the digital-analog converter, to receive the second analog video signal, and connected to the drawing processing circuit, to receive the second synchronizing signal, said switching circuit having an output and being capable of assuming alternatively a first state in which said first input is coupled to said output and a second state in which said second input is coupled to said output; and a display device connected to said switching circuit output for displaying video images in response to the first and second analog video signals and the first and second synchronizing signals.

Claim 44

A display unit, comprising: a digital interface circuit adapted to be coupled to digital equipment for receipt of compressed digital data therefrom; a decompression circuit for decompressing the received compressed digital data to provide a digital video signal and a synchronizing signal; a digital-analog converter for converting the digital video signal from the decompression circuit into an analog video signal; and a display device for displaying video images in response to the analog video signal and the synchronizing signal.

Claim 45

A display unit, comprising: a digital interface circuit adapted to be coupled to digital equipment for receipt of compressed digital data therefrom; a decompression circuit for decompressing the received compressed digital data to provide a digital video signal and a synchronizing signal; a digital-analog converter for converting the digital video signal from the decompression circuit into an analog video signal; and a display device for displaying video images in response to the analog video signal and the synchronizing signal.