EP0261896A2
Expired / Lapsed
EP
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Display device
Assignee: Central Research Laboratories Ltd
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Filing: 1987-09-18
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Granted: —
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Expires: 2007-09-18
Abstract
Abstract A colour-sequential display 1 is formed by a matrix of surface-stabilised bi-stable ferroelectric liquid crystal elements 2, each being separately settable by a matrix driver 3, to provide brightness control of the display, the activation duration of the sets of fluorescent tubes is variable, being dependent on the binary significance of the brightness information for the relevant colour in the input signal. Half of the frame time (T) is used for the numerous setting operations on the matrix of elements and half is used for the backlighting operations of the various settings.
Inventors
- 👤 David John Gibbons
- 👤 Ian Mcdonald Green
- 👤 Bernard Jeffrey Green
- 👤 Andrew Terence Rowley
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 18:43
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3406; G09G3/3413; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3629; 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; G09G2300/00; G09G2300/04; G09G2300/0439; G09G2300/0443; G09G2310/00; G09G2310/02; G09G2310/0202; G09G2310/0205; G09G2310/0235; G09G2310/024; G09G2310/06; G09G2310/061; G09G2310/08; G09G2320/00; G09G2320/06; G09G2320/0626; G09G2320/0633; G09G2320/064; G09G2320/0666; G09G3/2007; G09G3/2018; G09G3/2022; G09G3/2074
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A display device comprising a lattice of liquid crystal display elements, each element selectively settable between two states, one state allowing the transmission of light therethrough and the other state not allowing the transmission of light therethrough, means to effect setting of the lattice in accordance with a portion of a signal for display, and means to control the light output by the display device for a given setting of the lattice, said control means including means to render the amount of light passing through the lattice for a given setting proportional to the binary significance of that portion of the input signal.
Claim 2
Dependent Claim
103 words
A display device comprising a lattice of liquid crystal display elements, each element selectively settable between two states, one state allowing the transmission of light therethrough and the other state not allowing the transmission of light therethrough, means to effect setting of the lattice in accordance with a portion of a signal for display, and means to control the light output by the display device for a given setting of the lattice, said control means including means to render the amount of light passing through the lattice for a given setting proportional to the binary significance of that portion of the input signal.
Claim 3
Dependent Claim
44 words
A display device according to Claim 1, wherein the light passage means comprises means to operate, for a given setting, a light source at a light intensity proportional to the binary significance of the portion of the signal for display at that given setting.
Claim 4
Dependent Claim
51 words
A display device according to Claim 1 or 2, wherein in a colour display, the light-passage means comprises means to operate three light sources of different colour characteristics, such that the intensity of each light source is proportional to the binary significance of that portion of the signal for that setting.
Claim 5
Dependent Claim
20 words
A display device according to Claim 3, wherein the maximum intensity for the three light sources is not the same.
Claim 6
Dependent Claim
40 words
A display device according to any one of the preceding claims, wherein the light-passage means comprises means to generate a light source for a time duration proportional to the binary significance of that portion of the signal for that setting.
Claim 7
Dependent Claim
48 words
A display according to Claim 5 wherein, in a colour display, the light-passage means comprises means to operate three light sources of different colour characteristics, such that the intensity of each light source is proportional to the binary significance of that portion of the signal for that setting.
Claim 8
Dependent Claim
20 words
A display according to Claim 6, wherein the maximum time duration for the three light sources is not the same.
Claim 9
Independent Claim
102 words
A method of operating a display device comprising a lattice of liquid crystal display elements, each element selectively settable between two states, one state allowing the transmission of light therethrough and the other state not allowing the transmission of light therethrough, and method comprising setting the lattice in accordance with a portion of a signal for display, and controlling the light output by the display device for a given setting of the lattice, said control stage including rendering the amount of light passing through the lattice for a given setting proportional to the binary significance of that portion of the input signal.
Claim 10
Independent Claim
102 words
A method of operating a display device comprising a lattice of liquid crystal display elements, each element selectively settable between two states, one state allowing the transmission of light therethrough and the other state not allowing the transmission of light therethrough, and method comprising setting the lattice in accordance with a portion of a signal for display, and controlling the light output by the display device for a given setting of the lattice, said control stage including rendering the amount of light passing through the lattice for a given setting proportional to the binary significance of that portion of the input signal.
Claim 11
Dependent Claim
19 words
A method according to Claim 8, comprising operating, for a given setting, a light source at a light intensity.
Claim 12
Independent Claim
31 words
A method according to claims 8 or 9 comprising generating a light source for a time duration proportional to the binary significance of that portion of the signal for that setting.
References Cited (Backward Citations)
No citation records indexed.
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