Patent EP0509727A2 successfully refreshed from Google Patents.
EP0509727A2
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Liquid crystal display device
Assignee: Sharp Corp
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Filing: 1992-04-10
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Granted: —
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Expires: 2012-04-10
Abstract
Abstract It is an object of the invention to present a liquid crystal display device capable of displaying high precisely and brightly. The incident light into the reflection type liquid crystal display element (2) is selectively varied by using the light selecting means (3), that is. cyan filter (19C), magenta filter (19M), and yellow filter (19Y), and red light, green light, and blue light are entered in every unit time. By controlling the reflection/cutoff of color lights of these three primary color by the reflection type liquid crystal display element (2), multicolor display of eight colors or full-color display is realized.
Inventors
- 👤 Yutaka Ishii
- 👤 Yoshitaka Yamamoto
- 👤 Terutoshi Tsuchihira
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 16:29
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3406; G09G3/3413; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13475; G09G3/36; G09G3/3607; G09G2300/00; G09G2300/08; G09G2300/0809; G09G2300/0842; G09G2300/0852; G09G2310/00; G09G2310/02; G09G2310/0235
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
A liquid crystal display device (1) comprising: a liquid crystal display element (2) composed of electrodes formed on the confronting surfaces of a transparent substrate (7) and a substrate (8) having light reflecting means for reflecting the incident light from the transparent substrate side, using the electrode overlapped regions display region, and placing an interposing liquid crystal (9) between the transparent substrate (7) and the substrate (8), and light selecting means (3) disposed at the transparent substrate side for varying the wavelength of the incident light in the liquid crystal display element (2) in every predetermined unit time.
Claim 2
Dependent Claim
166 words
A liquid crystal display device of claim 1, wherein the light selecting means (3) comprises: a cyan filter (19C) forming transparent electrodes nearly over the entire area of the confronting surfaces of a pair of transparent substrates (10,11), and placing an interposing liquid crystal (12) containing dichroic pigment of cyan between the pair of transparent substrates (10,11), a magenta filter (19M) forming transparent electrodes nearly over the entire area of the confronting surfaces of a pair of transparent substrates (13,14), and placing an interposing liquid crystal (15) containing dichroic pigment of magenta between the pair of transparent substrates (13,14), a yellow filter (19Y) forming transparent electrodes nearly over the entire area of the confronting surfaces of a pair of transparent substrates (16,17), and placing an interposing liquid crystal (18) containing dichroic pigment of yellow between the pair of transparent substrates (16,17), and filter driving means (5) for applying a voltage selectively to the transparent electrodes of cyan filter (19C), magenta filter (19M) and yellow filter (19Y).
Claim 3
Dependent Claim
88 words
A liquid crystal display device of claim 2, wherein the filter driving means (5) sequentially drives the cyan filter (19C), magenta filter (19M) and yellow filter (19Y) in every predetermined unit time, forms a red display period in which the incident light to the liquid crystal display element (2) is red, a green display period in which it is green, and a blue display period in which it is blue, and sets the unit display period by the red display period, green display period, and blue display period.
Claim 4
Dependent Claim
51 words
A liquid crystal display device of claim 3, wherein the liquid crystal display element (2) is driven by the liquid crystal driving means (4) for driving individually the quantity of reflected light in each display region, in every display period of red, green and blue for composing the unit display period.
Claim 5
Dependent Claim
33 words
A liquid crystal display device of claim 4, wherein the liquid crystal driving means sets (4) the quantity of reflected light in each display region either at 0 or at a predetermined value.
Claim 6
Dependent Claim
34 words
A liquid crystal display device of claim 4, wherein the liquid crystal driving means (4) changes the quantity of reflected light in each display region continuously or stepwise between 0 and a predetermined value.
Claim 7
Dependent Claim
58 words
A liquid crystal display device of claim 1, 2, 3, 4, 5 or 6, wherein the liquid crystal display element (2) is an active matrix type liquid crystal display element forming one common electrode nearly over the entire surface of the transparent substrate (7), and forming plural display electrodes for forming display regions on the confronting substrate (8).
Claim 8
Dependent Claim
46 words
A liquid crystal display device of claim 7, wherein the liquid crystal driving means (4) is controlled by display control means (6) for producing a scanning signal for specifying the plural display electrodes individually, and a driving signal for applying a voltage to each display electrode.
Claim 9
Dependent Claim
105 words
A liquid crystal display device of claim 8, wherein the liquid crystal driving means (4) comprises plural unit driving parts corresponding to the plural display electrodes individually, and the unit driving part comprises a signal scanning part (32) controlled on/off by the scanning signal for producing the driving signal in ON state, a buffer circuit (34) for applying a voltage to the display electrode according to the driving signal from the signal scanning part (32), and a signal holding capacitor (33) disposed between the signal scanning part (32) and buffer circuit (34) for holding the potential of the driving signal from the signal scanning part.
Claim 10
Dependent Claim
159 words
A liquid crystal display device of claim 8, wherein the liquid crystal driving means (4a) comprises plural unit driving parts corresponding to the plural display electrodes individually, and the unit driving part comprises a signal scanning part (32) controlled on/off by the scanning signal for producing the driving signal in ON state, a buffer circuit (34) for applying a voltage to the display electrode according to the driving signal from the signal scanning part (32), two signal holding capacitors (33a, 33b) disposed between the signal scanning part (32) and buffer circuit (34) for holding the potential of the driving signal from the signal scanning part (32), and connection changeover means (SW1, SW2) for connecting other capacitor to the buffer circuit (34) when connecting one capacitor or the two signal holding capacitors (33a, 33b) to the signal scanning part (32), and connecting one capacitor to the buffer circuit (34) when connecting the other capacitor to the signal scanning part (32).
References Cited (Backward Citations)
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