US5093652A
Expired / Lapsed
US
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Display device
Assignee: Central Research Laboratories Ltd
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Filing: 1991-02-26
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Granted: 1992-03-03
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Expires: 2011-02-26
Abstract
Abstract A display device has a lattice of pixel elements each selectably settable. A method of operating the display device comprises the steps of receiving a signal representing a picture for display during a display period and illuminating the lattice to produce, during a first interval within the display period, a first light output from the lattice having a first predetermined color characteristic and to produce at least one additional light output from the lattice. Each said additional light output has a different predetermined color characteristic and a respective interval within the display period separate from the first interval. The method further comprises the step of time-multiplex addressing blocks of pixel elements a plurality of address times during each interval. The addressing step includes setting a group of blocks, the group consisting of a plurality of blocks spaced apart in the addressing sequence such that the blocks in the group form a series with adjacent blocks having a temporal separation in the addressing sequence exhibiting a geometric progression with a common ratio N being an integer equal to 2 or more. In this way, addressing of the lattice occurs simultaneously with its illumination by the appropriate color, allowing a greater proportion of the frame time for the addressing operation so that additional addressing information can be utilized.
Inventors
- 👤 Stephen D. Bull
- 👤 Christopher J. Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3406; G09G2310/00; G09G2310/02; G09G2310/0202; G09G2310/0218; G09G2310/0235; G09G2310/06; G09G2310/061; G09G3/2007; G09G3/2018; G09G3/2022
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
160 words
A method of operating a display device having a lattice of pixel elements such selectably settable, the method comprising: receiving data representing a picture for display during a display period, which data comprises data-bits weighted in accordance with their significance; illuminating the lattice to produce, during a first interval within the display period, a first light output from the lattice having a first predetermined colour characteristic and to produce at least one additional light output from the lattice, each said additional light output having a different predetermined colour characteristic and having a respective interval within the display period separate from the first interval; and time-multiplex addressing, with the data, blocks of pixel elements a plurality of address times during each interval; the blocks of pixel elements for time-multiplex addressing being selected such that they are spatially separated in accordance with a binary sequence, and selected blocks are selectively set for display in accordance with the significance of the weighted data-bits.
Claim 2
Independent Claim
160 words
A method of operating a display device having a lattice of pixel elements such selectably settable, the method comprising: receiving data representing a picture for display during a display period, which data comprises data-bits weighted in accordance with their significance; illuminating the lattice to produce, during a first interval within the display period, a first light output from the lattice having a first predetermined colour characteristic and to produce at least one additional light output from the lattice, each said additional light output having a different predetermined colour characteristic and having a respective interval within the display period separate from the first interval; and time-multiplex addressing, with the data, blocks of pixel elements a plurality of address times during each interval; the blocks of pixel elements for time-multiplex addressing being selected such that they are spatially separated in accordance with a binary sequence, and selected blocks are selectively set for display in accordance with the significance of the weighted data-bits.
Claim 3
Dependent Claim
59 words
A method according to claim 1 wherein said step of illuminating the lattice includes a first step of illuminating the lattice during said first interval with a light source of said first predetermined colour characteristic and a second step of illuminating the lattice during said a respective interval with a light source of said a different predetermined colour characteristic.
Claim 4
Dependent Claim
18 words
A method according to claim 1 further comprising the step of blanking the lattice prior to each interval.
Claim 5
Dependent Claim
35 words
A method according to claim 1 wherein the step of blanking the lattice prior to each interval has a longer duration than a switching period between said first and second steps of illuminating the lattice.
Claim 6
Dependent Claim
47 words
A method according to claim 1 wherein the number of address times for said first interval is greater than the number of address times during said a respective interval whereby the resolution of said first predetermined colour is greater than the resolution of said different predetermined colour.
Claim 7
Dependent Claim
22 words
A method according to claim 1 wherein said first predetermined colour is green and the different predetermined colours are red and blue.
Claim 8
Dependent Claim
183 words
A display device comprising: a lattice of pixel elements, each selectively settable in dependence upon a respective part of received data representing one picture for display in a display period, which data comprises data-bits weighted in accordance with their significance; means for illuminating the lattice to produce, during a first interval within the display period, a first light output from the lattice having a first predetermined colour characteristic and to produce at least one additional light output from the lattice, each said additional light output having a different predetermined colour characteristic and having a respective interval within the display period and separate from the first interval; and means for effecting time-multiplex addressing, with the data, blocks of pixel elements a plurality of address times for each interval of the illumination means; the time-multiplex addressing means including means for selecting the blocks of pixel elements for time multiplex addressing such that the blocks of pixel elements are spatially separated in accordance with a binary sequence, and such that selected blocks are selectively set for display in accordance with the significance of the weighted data-bits.
Claim 9
Dependent Claim
183 words
A display device comprising: a lattice of pixel elements, each selectively settable in dependence upon a respective part of received data representing one picture for display in a display period, which data comprises data-bits weighted in accordance with their significance; means for illuminating the lattice to produce, during a first interval within the display period, a first light output from the lattice having a first predetermined colour characteristic and to produce at least one additional light output from the lattice, each said additional light output having a different predetermined colour characteristic and having a respective interval within the display period and separate from the first interval; and means for effecting time-multiplex addressing, with the data, blocks of pixel elements a plurality of address times for each interval of the illumination means; the time-multiplex addressing means including means for selecting the blocks of pixel elements for time multiplex addressing such that the blocks of pixel elements are spatially separated in accordance with a binary sequence, and such that selected blocks are selectively set for display in accordance with the significance of the weighted data-bits.
Claim 10
Dependent Claim
32 words
A display device according to claim 7 wherein the illumination means comprises a light source of said first predetermined colour characteristic and a light source of each said different predetermined colour characteristic.
Claim 11
Dependent Claim
18 words
A display device according to claim 7 further comprising means for blanking the lattice prior to each interval.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |