EP0354480A2
Expired / Lapsed
EP
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Display signal generator
Assignee: Seiko Epson Corp
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Filing: 1989-08-03
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Granted: —
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Expires: 2009-08-03
Abstract
Abstract A display signal generator for graphic display has a pallet (6) or look-up table for converting digital color code data into display data. The display data converted by the pallet are processed to RGB signals for producing a CRT display and, at the same time, are supplied to a flat-panel interface unit, without using an analog-to-digital converter and corresponding control circuits. A clock signal synchronized with the display data is produced by circuits formed on the same semiconductor substrate as the other components of the display signal generator. The delay time involved in the conversion of the digital color code data into display data is also imparted to display control signals such as horizontal and vertical synchronizing signals in order to maintain a stable timing relation between the display data and the display control signals. The display signal generator can be constructed in a smaller size and at lower cost than the existing systems and can process the data at a higher speed.
Inventors
- 👤 Shigeo C/O Seiko Epson Corporation Tsuruoka
- 👤 Jun C/O Seiko Epson Corporation Nakamura
- 👤 Akira C/O Seiko Epson Corporation Nakada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 12:50
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/02; G09G5/06; G06; G06F; G06F3/00; G06F3/14; G06F3/147
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
A display signal generator which converts digital display data with a pixel as a unit into a display signal and sends the display signal to a display device, comprising: converter means (6; 102) which converts said display data into digital color data; a digital-to-analog converter (12-14; 103-108) for receiving said color data output from said converter means and generating analog signals to produce a color display corresponding to said color data on a CRT display; first output terminals (44-46; 109-111) for outputting said analog signals for driving a CRT display unit; and a second output terminal (47) for outputting at least part of said color data from said converter means for driving a flat-panel display unit.
Claim 2
Dependent Claim
116 words
A display signal generator which converts digital display data with a pixel as a unit into a display signal and sends the display signal to a display device, comprising: converter means (6; 102) which converts said display data into digital color data; a digital-to-analog converter (12-14; 103-108) for receiving said color data output from said converter means and generating analog signals to produce a color display corresponding to said color data on a CRT display; first output terminals (44-46; 109-111) for outputting said analog signals for driving a CRT display unit; and a second output terminal (47) for outputting at least part of said color data from said converter means for driving a flat-panel display unit.
Claim 3
Dependent Claim
42 words
The signal generator according to claim 1, further comprising a third output terminal (41) for outputting a pixel clock signal having a pixel frequency, said pixel clock signal being synchronized with said color data output from said second output terminals (44-46; 109-111).
Claim 4
Dependent Claim
29 words
The signal generator according to claim 2, wherein said converter means (6; 102), said digital-to-analog converter (12-14; 103-108) and said output terminals are formed on the same semiconductor substrate.
Claim 5
Dependent Claim
44 words
The signal generator according to claim 3, further comprising first storage means (11) which stores at least part of said color data output from said converter means (6) in accordance with said pixel clock signal, and sends it to said second output terminal (47).
Claim 6
Dependent Claim
39 words
The signal generator according to claim 4, further comprising second storage means (8-10) which stores said color data output from said converter means (6) in accordance with said pixel clock signal, and sends it to said digital-to-analog converter (12-14).
Claim 7
Dependent Claim
93 words
The signal generator according to any of claims 1 to 5, wherein the integrated circuit formed on said semiconductor substrate includes a first input terminal (19) which receives said display data from an external unit and sends it to said converter means (6), a second input terminal (16) which receives from an external unit the original clock signal which is in synchronism with said display data and has said pixel frequency, and means (1) generating said pixel clock signal by buffering or delaying the original clock signal input to said second input terminal.
Claim 8
Dependent Claim
107 words
The signal generator according to claim 6, further including a clock signal generator (1) for generating in response to the original clock signal first and second pixel clock signals (24, 25) of which the second pixel clock signal (25) is delayed with respect to the first pixel clock signal (24), and third storage means (3) which stores the display data input from said first input terminal (19) in accordance with said first pixel clock signal, and which sends the display data to said converter means (6), wherein said second pixel clock signal is supplied to said first storage means (11) and to said third output terminal (41).
Claim 9
Dependent Claim
101 words
A display signal generator which converts digital display data with a pixel as a unit into a digital display signal for a flat-panel display, comprising clock generator means (127; 146) which generates a first pixel clock signal having a pixel frequency, converter means (131; 151) which converts said display data into said display signal, and first storage means (135; 155) which stores said display signal output from said converter means in accordance with said first pixel clock signal, wherein said first pixel clock signal and said display signal stored in said first storage means are sent to a flat-panel display device.
Claim 10
Dependent Claim
101 words
A display signal generator which converts digital display data with a pixel as a unit into a digital display signal for a flat-panel display, comprising clock generator means (127; 146) which generates a first pixel clock signal having a pixel frequency, converter means (131; 151) which converts said display data into said display signal, and first storage means (135; 155) which stores said display signal output from said converter means in accordance with said first pixel clock signal, wherein said first pixel clock signal and said display signal stored in said first storage means are sent to a flat-panel display device.
Claim 11
Dependent Claim
130 words
A display signal generator which converts digital display data with a pixel as a unit into a display signal for display on a display device, comprising clock generator means (1) for generating a first pixel clock signal (25) having a pixel frequency; converter means (6) for converting said display data into said display signal; first storage means (8-11) for storing said display signal output from said converter means (6) in accordance with said first pixel clock signal (25), and second storage means (7) for storing synchronizing signals and/or blanking signals for the display in accordance with said first pixel clock signal (25), wherein said display signal stored in said first storage means and said synchronizing or blanking signals stored in said second storage means are sent to the display device.
Claim 12
Dependent Claim
130 words
A display signal generator which converts digital display data with a pixel as a unit into a display signal for display on a display device, comprising clock generator means (1) for generating a first pixel clock signal (25) having a pixel frequency; converter means (6) for converting said display data into said display signal; first storage means (8-11) for storing said display signal output from said converter means (6) in accordance with said first pixel clock signal (25), and second storage means (7) for storing synchronizing signals and/or blanking signals for the display in accordance with said first pixel clock signal (25), wherein said display signal stored in said first storage means and said synchronizing or blanking signals stored in said second storage means are sent to the display device.
References Cited (Backward Citations)
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