EP0261897A2
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EP
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Display device
Assignee: EMI Group Ltd
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Filing: 1987-09-18
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Granted: —
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Expires: 2007-09-18
Abstract
Abstract Television receiver 1 of Figure 1 has a liquid crystal display 2 formed of a lattice of display elements 3 made from liquid crystal material, each element being individually acutable, the lattice of elements 3 being backlit by fluorescent tubes 4 whose light intensity and duration of operation can be controlled. The video signal has a 70Hz scan rate and a scan period of 14mS, each picture of display information having an 8-bit word for each display element, a word beginning with the most-significant-bit and ending with the least-significant-bit. In the processing for the display of the most-significant-bits of the words, frame store 6 outputs the first bit of each word and sends the bits to a control unit 7 for an array of drivers 8, one being assigned to each row and column of the lattice for setting of each element to it appropriate condition. Once all the elements are set, driver control unit 7 activates the tubes 4 for a time duration and intensity appropriate to the significance of the bit.
Inventors
- 👤 Ian Mcdonald Green
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 05:05
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3406; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133621; G02F1/133622; G09G2310/00; G09G2310/02; G09G2310/0235; G09G2320/00; G09G2320/06; G09G2320/0626; G09G2320/064; G09G3/2007; G09G3/2018; G09G3/2022; G09G3/2074
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
114 words
A display device comprising: a lattice of bi-stable display elements; means to input a signal representing the display information for one picture to a store; means to output, from the store, the display information for one picture in sections, each section consisting of corresponding portions of display information for all the bi-stable display elements; a plurality of drivers, each allocated to a row or column of the lattice, to set each display element to a condition in accordance with its respective portion of the signal from the output means; means to produce a light output; and means to modulate the light output in accordance with the significance of the signal from the output means.
Claim 2
Dependent Claim
114 words
A display device comprising: a lattice of bi-stable display elements; means to input a signal representing the display information for one picture to a store; means to output, from the store, the display information for one picture in sections, each section consisting of corresponding portions of display information for all the bi-stable display elements; a plurality of drivers, each allocated to a row or column of the lattice, to set each display element to a condition in accordance with its respective portion of the signal from the output means; means to produce a light output; and means to modulate the light output in accordance with the significance of the signal from the output means.
Claim 3
Dependent Claim
90 words
A display device according to Claim 1, wherein the signal for one picture comprises a sequence of word each one corresponding to the display information for a display element in the lattice, and the output means has means to take out, from the store, the first bit in each word and pass them sequentially to the lattice, and then to take out, from the store, the second bit in each word and pass them sequentially to the lattice, this operation being repeated until all the bits have been so processed.
Claim 4
Dependent Claim
46 words
A display device according to Claims 1 or 2, wherein the light modulation means has means to regulate the intensity of the light output in accordance with the given bit-position, and/or means to regulate the duration of the light output in accordance with the given bit-position.
Claim 5
Dependent Claim
27 words
A display device according to any one of the preceding Claims, comprising means to blank the elements during setting of the elements for a given bit position.
Claim 6
Dependent Claim
36 words
A display device according to any one of the preceding Claims, comprising a lattice formed of groups of three display elements, each of the elements in a group producing a different colour and being set separately.
Claim 7
Dependent Claim
38 words
A display device according to any one of the preceding Claims, wherein the lattice is formed of single display elements, each of which is exposed to light of three colours sequentially, an element being re-set after each exposure.
Claim 8
Dependent Claim
20 words
A display device according to any one of the preceding Claims, wherein each row and column has an separate driver.
Claim 9
Dependent Claim
22 words
A display device according to any one of the preceding claims, wherein a display element comprises a selectively settable liquid crystal cell.
Claim 10
Independent Claim
170 words
A method of operating a grey-scale display having a lattice of bi-stable display elements, the method comprising:- inputting a signal, representing the display information for one picture, to a store; outputting from the store a section of the display information for one picture, the section consisting of corresponding portions of display information for all the bi-stable display elements; using a plurality of drivers, each allocated to a row or column of the lattice, to effect setting of each display element to a condition in accordance with its respective portion of the signal from the output means; producing a light output, once the elements are set, modulated in accordance with the significance of the portion of the video signal; outputting from the store a second section of the display information, the second section consisting of different corresponding portions of display information for all the bi-stable display elements, and effecting the setting and modulating operations for the second section; and repeating the outputting, setting and modulating operations on any further corresponding portions.
Claim 11
Independent Claim
170 words
A method of operating a grey-scale display having a lattice of bi-stable display elements, the method comprising:- inputting a signal, representing the display information for one picture, to a store; outputting from the store a section of the display information for one picture, the section consisting of corresponding portions of display information for all the bi-stable display elements; using a plurality of drivers, each allocated to a row or column of the lattice, to effect setting of each display element to a condition in accordance with its respective portion of the signal from the output means; producing a light output, once the elements are set, modulated in accordance with the significance of the portion of the video signal; outputting from the store a second section of the display information, the second section consisting of different corresponding portions of display information for all the bi-stable display elements, and effecting the setting and modulating operations for the second section; and repeating the outputting, setting and modulating operations on any further corresponding portions.
Claim 12
Dependent Claim
80 words
A method according to Claim 9, wherein the signal comprises an 8-bit word for each element, and the bits, of a predetermined significance, if the words are first output from the store for setting and display, and then thereafter the bits, of another significance, of the words are output from the store for setting and display, the total light outputting being of an appropriate ration to the previous output, this sequence being repeated until all the bits have been displayed.
Claim 13
Dependent Claim
30 words
A method according to Claim 9 or 10 wherein modulation of the light output is achieved by regulation of the light intensity and/or of the duration of the light output.
References Cited (Backward Citations)
No citation records indexed.
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