US6184874B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for driving a flat panel display
Assignee: Motorola Solutions Inc
•
Filing: 1997-11-19
•
Granted: 2001-02-06
•
Expires: 2017-11-19
Abstract
Abstract A method for driving a field emission display ( 10 ) includes the steps of dividing a digital video word ( 14 ), which has n-bits, into N digital sub-words ( 16, 17 ), each of which has n′-bits, and sequentially converting each of the digital sub-words ( 16, 17 ) into a control signal ( 27, 29 ). The control signals ( 27, 29 ) are sequentially utilized to control drive signals ( 28, 38, 39, 41 ) applied to the field emission display ( 10 ).
Inventors
- 👤 Robert T. Smith
- 👤 Cecil W. Penn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:48
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/2007; G09G3/2018
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
123 words
A method for driving a flat panel display comprising the steps of: receiving a digital video word; dividing the digital video word into a plurality of digital sub-words; converting a first one of the plurality of digital sub-words into a first control signal; utilizing the first control signal to control a first drive signal applied to the flat panel display; thereafter, converting a second one of the plurality of digital sub-words into a second control signal; and utilizing the second control signal to control a second drive signal applied to the flat panel display, wherein an active time of the first and second control signals is determined by a value of, respectively, the first and second one of the plurality of digital sub-words.
Claim 2
Independent Claim
123 words
A method for driving a flat panel display comprising the steps of: receiving a digital video word; dividing the digital video word into a plurality of digital sub-words; converting a first one of the plurality of digital sub-words into a first control signal; utilizing the first control signal to control a first drive signal applied to the flat panel display; thereafter, converting a second one of the plurality of digital sub-words into a second control signal; and utilizing the second control signal to control a second drive signal applied to the flat panel display, wherein an active time of the first and second control signals is determined by a value of, respectively, the first and second one of the plurality of digital sub-words.
Claim 3
Dependent Claim
45 words
The method for driving a flat panel display as claimed in claim 1 , wherein a value of the first drive signal is responsive to the first control signal, and wherein a value of the second drive signal is responsive to the second control signal.
Claim 4
Independent Claim
143 words
A method for driving a flat panel display comprising the steps of: receiving a digital video word, wherein the digital video word has a plurality of digital sub-words; selecting a first one of the plurality of digital sub-words; converting the first one of the plurality of digital sub-words into a first control signal; utilizing the first control signal to control a first drive signal applied to the flat panel display; thereafter, selecting a second one of the plurality of digital sub-words; converting the second one of the plurality of digital sub-words into a second control signal; and utilizing the second control signal to control a second drive signal applied to the flat panel display, wherein an active time of the first and second control signals is determined by a value of, respectively, the first and second one of the plurality of digital sub-words.
Claim 5
Independent Claim
143 words
A method for driving a flat panel display comprising the steps of: receiving a digital video word, wherein the digital video word has a plurality of digital sub-words; selecting a first one of the plurality of digital sub-words; converting the first one of the plurality of digital sub-words into a first control signal; utilizing the first control signal to control a first drive signal applied to the flat panel display; thereafter, selecting a second one of the plurality of digital sub-words; converting the second one of the plurality of digital sub-words into a second control signal; and utilizing the second control signal to control a second drive signal applied to the flat panel display, wherein an active time of the first and second control signals is determined by a value of, respectively, the first and second one of the plurality of digital sub-words.
Claim 6
Independent Claim
91 words
A method for driving a flat panel display comprising the steps of: receiving a digital video word; dividing the digital video word into a plurality of digital sub-words; sequentially converting each of the plurality of digital sub-words into a control signal to define a plurality of control signals; and sequentially utilizing each of the plurality of control signals to control a drive signal applied to the flat panel display wherein an active time of each of the plurality of control signals is determined by a value of its respective digital sub-word.
Claim 7
Independent Claim
91 words
A method for driving a flat panel display comprising the steps of: receiving a digital video word; dividing the digital video word into a plurality of digital sub-words; sequentially converting each of the plurality of digital sub-words into a control signal to define a plurality of control signals; and sequentially utilizing each of the plurality of control signals to control a drive signal applied to the flat panel display wherein an active time of each of the plurality of control signals is determined by a value of its respective digital sub-word.
Claim 8
Dependent Claim
64 words
The method for driving a flat panel display as claimed in claim 4 , further including the step of providing a line time, and wherein the step of sequentially utilizing each of the plurality of control signals to control a drive signal, comprises the step of sequentially utilizing each of the plurality of control signals to control a drive signal during the line time.
Claim 9
Dependent Claim
60 words
The method for driving a flat panel display as claimed in claim 4 , further including the step of providing a plurality of sub-frames, and wherein the step of sequentially utilizing each of the plurality of control signals to control a drive signal comprises the step of utilizing the plurality of control signals one each in the plurality of sub-frames.
Claim 10
Dependent Claim
59 words
The method for driving a flat panel display as claimed in claim 4 , wherein the step of sequentially utilizing each of the plurality of control signals to control a drive signal comprises the step of sequentially applying each of the plurality of control signals to a voltage source to control an active time of an output voltage value.
Claim 11
Dependent Claim
69 words
The method for driving a flat panel display as claimed in claim 4 , wherein the step of sequentially utilizing each of the plurality of control signals to control a drive signal includes the step of sequentially applying each of the plurality of control signals to a current source responsive to each of the plurality of control signals, wherein an output of the current source defines the drive signal.
Claim 12
Dependent Claim
46 words
The method for driving a flat panel display as claimed in claim 4 , wherein the step of dividing the digital video word into a plurality of digital sub-words comprises the step of dividing an 8-bit video word into a first nibble and a second nibble.
Claim 13
Independent Claim
161 words
A method for driving a flat panel display comprising the steps of: providing an 8-bit video word, wherein the 8-bit video word has a least significant nibble and a most significant nibble; selecting the least significant nibble converting the least significant nibble into a first control signal, wherein the first control signal has an active time responsive to a value of the least significant nibble; utilizing the first control signal to control a first drive signal applied to the flat panel display, wherein an active time of the first drive signal is responsive to the first control signal; thereafter, converting the most significant nibble into a second control signal, wherein the second control signal has an active time responsive to a value of the most significant nibble; and utilizing the second control signal to control a second drive signal applied to the flat panel display, wherein an active time of the second drive signal is responsive to the second control signal.
Claim 14
Independent Claim
161 words
A method for driving a flat panel display comprising the steps of: providing an 8-bit video word, wherein the 8-bit video word has a least significant nibble and a most significant nibble; selecting the least significant nibble converting the least significant nibble into a first control signal, wherein the first control signal has an active time responsive to a value of the least significant nibble; utilizing the first control signal to control a first drive signal applied to the flat panel display, wherein an active time of the first drive signal is responsive to the first control signal; thereafter, converting the most significant nibble into a second control signal, wherein the second control signal has an active time responsive to a value of the most significant nibble; and utilizing the second control signal to control a second drive signal applied to the flat panel display, wherein an active time of the second drive signal is responsive to the second control signal.
Claim 15
Dependent Claim
45 words
The method for driving a flat panel display as claimed in claim 10 , wherein a value of the first drive signal is responsive to the first control signal, and wherein a value of the second drive signal is responsive to the second control signal.
Claim 16
Independent Claim
161 words
A method for driving a flat panel display comprising the steps of: providing an 8-bit video word, wherein the 8-bit video word has a least significant nibble and a most significant nibble; selecting the most significant nibble; converting the most significant nibble into a first control signal, wherein the first control signal has an active time responsive to a value of the most significant nibble; utilizing the first control signal to control a first drive signal applied to the flat panel display, wherein an active time of the first drive signal is responsive to the first control signal; thereafter, converting the least significant nibble into a second control signal, wherein the second control signal has an active time responsive to a value of the least significant nibble; and utilizing the second control signal to control a second drive signal applied to the flat panel display, wherein an active time of the second drive signal is responsive to the second control signal.
Claim 17
Independent Claim
161 words
A method for driving a flat panel display comprising the steps of: providing an 8-bit video word, wherein the 8-bit video word has a least significant nibble and a most significant nibble; selecting the most significant nibble; converting the most significant nibble into a first control signal, wherein the first control signal has an active time responsive to a value of the most significant nibble; utilizing the first control signal to control a first drive signal applied to the flat panel display, wherein an active time of the first drive signal is responsive to the first control signal; thereafter, converting the least significant nibble into a second control signal, wherein the second control signal has an active time responsive to a value of the least significant nibble; and utilizing the second control signal to control a second drive signal applied to the flat panel display, wherein an active time of the second drive signal is responsive to the second control signal.
Claim 18
Independent Claim
161 words
A method for driving a field emission display comprising the steps of: providing an 8-bit video word, wherein the 8-bit video word has a least significant nibble and a most significant nibble; selecting the least significant nibble; converting the least significant nibble into a first control signal, wherein the first control signal has an active time responsive to a value of the least significant nibble; utilizing the first control signal to control a first drive signal applied to the field emission display, wherein an active time of the first drive signal is responsive to the first control signal; thereafter, converting the most significant nibble into a second control signal, wherein the second control signal has an active time responsive to a value of the most significant nibble; and utilizing the second control signal to control a second drive signal applied to the field emission display, wherein an active time of the second drive signal is responsive to the second control signal.
Claim 19
Independent Claim
161 words
A method for driving a field emission display comprising the steps of: providing an 8-bit video word, wherein the 8-bit video word has a least significant nibble and a most significant nibble; selecting the least significant nibble; converting the least significant nibble into a first control signal, wherein the first control signal has an active time responsive to a value of the least significant nibble; utilizing the first control signal to control a first drive signal applied to the field emission display, wherein an active time of the first drive signal is responsive to the first control signal; thereafter, converting the most significant nibble into a second control signal, wherein the second control signal has an active time responsive to a value of the most significant nibble; and utilizing the second control signal to control a second drive signal applied to the field emission display, wherein an active time of the second drive signal is responsive to the second control signal.
Claim 20
Dependent Claim
45 words
The method for driving a field emission display as claimed in claim 13 , wherein a value of the first drive signal is responsive to the first control signal, and wherein a value of the second drive signal is responsive to the second control signal.
Claim 21
Dependent Claim
84 words
The method for driving a field emission display as claimed in claim 13 , further comprising the steps of providing a gate voltage; providing, concurrent with the step of utilizing the first control signal to control a first drive signal, a first value of the gate voltage to define a first emission current; and providing, concurrent with the step of utilizing the second control signal to control a second drive signal, a second value of the gate voltage to define a second emission current.
Claim 22
Dependent Claim
78 words
The method for driving a field emission display as claimed in claim 15 , wherein the gate voltage is defined by an offset voltage and a switching voltage, and wherein the step of providing a first value of the gate voltage comprises the step of providing a first value of the offset voltage, and wherein the step of providing a second value of the gate voltage comprises the step of providing a second value of the offset voltage.
Claim 23
Dependent Claim
78 words
The method for driving a field emission display as claimed in claim 15 , wherein the gate voltage is defined by an offset voltage and a switching voltage, and wherein the step of providing a first value of the gate voltage comprises the step of providing a first value of the switching voltage, and wherein the step of providing a second value of the gate voltage comprises the step of providing a second value of the switching voltage.
References Cited (Backward Citations)
US5477110A
Cited
US5929828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-02-06 | 2004-08-07 | 2005-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-02-06 | 2008-08-07 | 2009-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-02-06 | 2012-08-07 | 2013-02-06 | $7700.00 | Window Closed / Lapsed |