Patent US4908613A successfully refreshed from Google Patents.
US4908613A
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Display device
Assignee: EMI Group Ltd
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Filing: 1987-09-18
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Granted: 1990-03-13
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Expires: 2007-09-18
Abstract
Abstract A liquid crystal display has a matrix of pixels each with a continuously clocked counter used both as the data store and as the mechanism of grey scale generation. The grey level of each pixel is stored as the phase of the counter with respect to a reference count. The data bus, load clock, counter clock and master phase reference are all lines which transport signals common to a large number of pixels. The shift data line is used to propagate a bit which enables the counter load input. Each pixel circuit instructs the adjacent circuit that it is next to be loaded, by use of a clock delay. Thus pixels are loaded in sequence from data on the load bus, that data being between load clock pulses. The bistable circuit element, set from the master timing and reset from the counter, has an output which directly drives a bistable liquid crystal display device.
Inventors
- 👤 Ian M. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:32
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G3/3651; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127; G09G2300/00; G09G2300/08; G09G2300/0809; G09G2300/0828; G09G2330/00; G09G2330/12; G09G3/2007; G09G3/2014; G09G3/3614; G09G3/3655
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
65 words
A display device for displaying a picture represented by picture-signals, the display device comprising: a lattice of pixels for displaying the picture; an associated counter for each pixel, each associated counter being operable for continuous counting; and means to operate each associated counter to effect actuation of each pixel for a time period dependent upon at least the value of the picture-signal for that pixel.
Claim 2
Dependent Claim
65 words
A display device for displaying a picture represented by picture-signals, the display device comprising: a lattice of pixels for displaying the picture; an associated counter for each pixel, each associated counter being operable for continuous counting; and means to operate each associated counter to effect actuation of each pixel for a time period dependent upon at least the value of the picture-signal for that pixel.
Claim 3
Dependent Claim
32 words
A display device according to claim 1 wherein the display device has means to input the picture-signal for a pixel to that pixel in order to set that pixel to a state.
Claim 4
Dependent Claim
80 words
A display device according to claim 1, the picture signal for a pixel having a detectable characteristic, the display device also comprising means for producing and applying a reference signal to each pixel, the reference signal having another detectable characteristic such that an interval of time between the reception at a pixel of said detectable characteristic and the reception of said another detectable characteristic can be determined wherein the time period for said pixel corresponds to said interval of time.
Claim 5
Dependent Claim
47 words
A display device according to claim 1, the picture signal for a pixel having a detectable characteristic, wherein an associated counter has means to monitor for the presence of said detectable characteristic and means to set said pixel to a state upon detection of said detectable characteristic.
Claim 6
Dependent Claim
18 words
A display device according to claim 1, 2, 3 or 4 wherein liquid crystal cells form the lattice.
Claim 7
Independent Claim
71 words
A method of operating a display device to display a picture represented by picture signals, the display device comprising a lattice of pixels for displaying the picture and an associated counter for each pixel, each associated counter being operable for continuous counting, the method comprising operating each associated counter to effect actuation of each pixel for a time period dependent upon at least the value of the picture-signal for that pixel.
Claim 8
Independent Claim
71 words
A method of operating a display device to display a picture represented by picture signals, the display device comprising a lattice of pixels for displaying the picture and an associated counter for each pixel, each associated counter being operable for continuous counting, the method comprising operating each associated counter to effect actuation of each pixel for a time period dependent upon at least the value of the picture-signal for that pixel.
Claim 9
Dependent Claim
79 words
A method according to claim 6, the picture signal for a pixel having a detectable characteristic, the method further comprising the steps of producing a reference signal having another detectable characteristic and of applying the reference signal to a pixel wherein the interval of time between the reception at a pixel of said detectable characteristic and the reception of said another detectable characteristic can be determined and the time period for said pixel corresponds to said interval of time.
Claim 10
Dependent Claim
41 words
A method according to claim 6, the picture signal for a pixel having a detectable characteristic wherein an associated counter monitors for the presence of said detectable characteristic and sets said pixel to a state upon detection of said detectable characteristic.
Claim 11
Dependent Claim
25 words
A method according to claim 6, comprising inputting the picture-signal for a pixel to that pixel in order to set that pixel to a state.
Claim 12
Dependent Claim
70 words
A display device for displaying a picture represented by a picture signal, the display device comprising: a lattice of pixels for displaying the picture; an associated counter for each pixel, each associated counter being operable for continuous counting; and means to operate each associated counter to effect actuation of each pixel at a brightness level for the picture dependent upon at least the value of the picture-signal for that pixel.
Claim 13
Dependent Claim
70 words
A display device for displaying a picture represented by a picture signal, the display device comprising: a lattice of pixels for displaying the picture; an associated counter for each pixel, each associated counter being operable for continuous counting; and means to operate each associated counter to effect actuation of each pixel at a brightness level for the picture dependent upon at least the value of the picture-signal for that pixel.
Claim 14
Dependent Claim
81 words
A display device according to claim 10, the picture signal for a pixel having a detectable characteristic, the display device also comprising means for producing and applying a reference signal to each pixel, the reference signal having another detectable characteristic such that an interval of time between the reception at a pixel of said detectable characteristic and the reception of said another detectable characteristic can be determined wherein the brightness level of a pixel is determined by said interval of time.
Claim 15
Independent Claim
72 words
A method of operating a display device to display a picture represented by picture-signals, the display device comprising a lattice of pixels for displaying a picture and an associated counter for each pixel each associated counter being operable for continuous counting, the method comprising operating each counter to effect actuation of each pixel at a brightness level for the picture dependent upon at least the value of the picture-signal for that pixel.
Claim 16
Independent Claim
72 words
A method of operating a display device to display a picture represented by picture-signals, the display device comprising a lattice of pixels for displaying a picture and an associated counter for each pixel each associated counter being operable for continuous counting, the method comprising operating each counter to effect actuation of each pixel at a brightness level for the picture dependent upon at least the value of the picture-signal for that pixel.
Claim 17
Dependent Claim
77 words
A method according to claim 12, the picture signal for a pixel having a detectable characteristic, the method further comprising the steps of producing a reference signal having another detectable characteristic and of applying the reference signal to a pixel wherein the interval of time between the reception at a pixel of said detectable characteristic and the reception of said another detectable characteristic can be determined and said brightness level is determined by said interval of time.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |