US5856814A
Expired / Lapsed
US
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Driving method for display apparatus
Assignee: Canon Inc
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Filing: 1996-08-01
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Granted: 1999-01-05
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Expires: 2016-08-01
Abstract
Abstract A display apparatus includes an optical modulation device comprising a pair of electrodes, and a photoconductor layer and an optical modulation substance layer between the electrodes, a signal light source for supplying light data carrying gradation data to the photoconductor layer, and a readout light source for supplying readout light for reading out image data to the optical modulation substance layer. The display apparatus is driven by a method including: scanningly supplying the light data to the photoconductor layer, and scanningly supplying the readout light to the optical modulation substance layer. Preferably, the lighting time of the readout light source is controlled to modulate an overlapping time between a period of the optical modulation substance assuming a prescribed optical state and the lighting time depending on given gradation data.
Inventors
- 👤 Mineto Yagyu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:38
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/001; G09G3/002; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G09G3/02; G09G3/20; G09G3/2007; G09G3/2014; G09G3/34; G09G3/3406; G09G3/342; G09G3/36; G09G3/3611; G09G3/3648; G09G2310/00; G09G2310/02; G09G2310/0235; G09G2310/024; G09G2310/06; G09G2310/061; G09G2360/00; G09G2360/14; G09G2360/141
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
129 words
A driving method for a display apparatus including an optical modulation device comprising a pair of electrodes, and a photoconductor layer and an optical modulation substance layer disposed between the electrodes, a signal light source for supplying light data carrying gradation data to the photoconductor layer, and a readout light source for supplying readout light for reading out image data to the optical modulation substance layer, said driving method comprising: scanningly supplying the light data to the photoconductor layer, and scanningly supplying the readout light to the optical modulation substance layer, wherein a lighting time of the readout light source is controlled to modulate an overlapping time between a period of the optical modulation substance assuming a prescribed optical state and the lighting time depending on given gradation data.
Claim 2
Dependent Claim
129 words
A driving method for a display apparatus including an optical modulation device comprising a pair of electrodes, and a photoconductor layer and an optical modulation substance layer disposed between the electrodes, a signal light source for supplying light data carrying gradation data to the photoconductor layer, and a readout light source for supplying readout light for reading out image data to the optical modulation substance layer, said driving method comprising: scanningly supplying the light data to the photoconductor layer, and scanningly supplying the readout light to the optical modulation substance layer, wherein a lighting time of the readout light source is controlled to modulate an overlapping time between a period of the optical modulation substance assuming a prescribed optical state and the lighting time depending on given gradation data.
Claim 3
Dependent Claim
41 words
A driving method according to claim 1, wherein a portion of the photoconductor layer is supplied with the light data as one horizontal scanning and thereafter a corresponding portion of the optical modulation substance layer is scanned with the readout light.
Claim 4
Dependent Claim
25 words
A driving method according to claim 1, wherein the signal light source supplies at least two types of light data having mutually different wavelength regions.
Claim 5
Dependent Claim
20 words
A driving method according to claim 1, wherein the signal light source supplies light data of red, green and blue.
Claim 6
Dependent Claim
28 words
A driving method according to claim 1, wherein the display apparatus includes a plurality of signal light sources and an equal number of optical modulation devices corresponding thereto.
Claim 7
Dependent Claim
18 words
A driving method according to claim 1, wherein the readout light is scanningly moved by a movable mirror.
Claim 8
Dependent Claim
29 words
A driving method according to claim 1, wherein the readout light is divided into spectra by means of a mirror selectively transmitting or reflecting a prescribed wavelength of light.
Claim 9
Dependent Claim
22 words
A driving method according to claim 1, wherein the display apparatus includes a CRT, a movable mirror and a polarization beam splitter.
Claim 10
Dependent Claim
25 words
A driving method according to claim 1, wherein the optical modulation device is supplied with reset light prior to the supply of the light data.
Claim 11
Dependent Claim
28 words
A driving method according to claim 1, wherein a reset voltage of one polarity is applied and then a writing voltage is applied between the pair of electrodes.
Claim 12
Dependent Claim
72 words
A driving method according to claim 1, wherein the optical modulation device includes a plurality of scanning lines and a plurality of data lines disposed to intersect the scanning lines so as to form a matrix of pixels each at an intersection of the scanning lines and the data lines, each pixel comprising the pair of electrodes, and the photoconductor layer and the optical modulation substance layer are disposed between the electrodes.
Claim 13
Dependent Claim
22 words
A driving method according to claim 11, wherein the pixels on all the scanning lines are simultaneously supplied with a reset voltage.
Claim 14
Dependent Claim
26 words
A driving method according to claim 11, wherein the photoconductor layer corresponding to the pixels or all the scanning lines is simultaneously supplied with reset light.
Claim 15
Dependent Claim
27 words
A driving method according to claim 11, wherein one horizontal scanning with the readout light is performed in synchronism with one horizontal scanning with the light data.
Claim 16
Dependent Claim
32 words
A driving method according to claim 1, wherein the readout light is supplied to a pixel for a period wherein the optical modulation substance in the pixel can change its optical state.
Claim 17
Dependent Claim
37 words
A driving method according to claim 1, wherein the optical modulation substance changes its optical state at a point in time which varies depending on the supplied light data within a period for supplying the readout light.
Claim 18
Dependent Claim
20 words
A driving method according to claim 1, wherein the optical modulation substance comprises a liquid crystal having a memory characteristic.
Claim 19
Dependent Claim
18 words
A driving method according to claim 1, wherein the optical modulation substance comprises a chiral smectic liquid crystal.
Claim 20
Dependent Claim
25 words
A driving method according to any one of claims 1-18, wherein the readout light is continuously supplied for a period of at most 1/30 sec.
Claim 21
Dependent Claim
25 words
A driving method according to any one of claims 1-18, wherein the readout light is continuously supplied for a period of at most 1/60 sec.
Claim 22
Dependent Claim
148 words
A driving method for a display apparatus including (a) an optical modulation device comprising a plurality of two-dimensionally arranged pixels, each comprising an optical modulation element formed by disposing an optical modulation substance layer between a pair of electrodes and a drive element for supplying an electric signal carrying gradation data to the optical modulation element, and (b) a readout light source for supplying readout light for reading out image data to the optical modulation substance layer, said driving method comprising: supplying the electric signal to a scanningly selected pixel, scanning the pixels with readout light to supply the readout light to the optical modulation substance layer at the selected pixel, and controlling a lighting time of the readout light source to modulate an overlapping time between a period of the optical modulation substance assuming a prescribed optical state and the lighting time depending on given gradation data.
Claim 23
Dependent Claim
148 words
A driving method for a display apparatus including (a) an optical modulation device comprising a plurality of two-dimensionally arranged pixels, each comprising an optical modulation element formed by disposing an optical modulation substance layer between a pair of electrodes and a drive element for supplying an electric signal carrying gradation data to the optical modulation element, and (b) a readout light source for supplying readout light for reading out image data to the optical modulation substance layer, said driving method comprising: supplying the electric signal to a scanningly selected pixel, scanning the pixels with readout light to supply the readout light to the optical modulation substance layer at the selected pixel, and controlling a lighting time of the readout light source to modulate an overlapping time between a period of the optical modulation substance assuming a prescribed optical state and the lighting time depending on given gradation data.
Claim 24
Dependent Claim
34 words
A driving method according to claim 21, wherein one horizontal row of pixels including the selected pixel are supplied with electric signals and thereafter the row of pixels is scanned with the readout light.
Claim 25
Dependent Claim
14 words
A driving method according to claim 21, wherein the drive element comprises a transistor.
Claim 26
Dependent Claim
18 words
A driving method according to claim 21, wherein the drive element comprises a transistor and a resistive element.
Claim 27
Dependent Claim
21 words
A driving method according to claim 21, wherein the drive element comprises a transistor, a resistive element, and a capacitive element.
Claim 28
Dependent Claim
25 words
A driving method according to claim 21, wherein the readout light is illuminated for a period longer than a scanning selection period of a pixel.
Claim 29
Dependent Claim
28 words
A driving method according to claim 21, wherein a point in time when a voltage applied to the optical modulation substance subsides below a prescribed value is modulated.
Claim 30
Dependent Claim
36 words
A driving method according to claim 21, wherein the drive element comprises a transistor connected to a pixel and having a source, a gate and a drain, and the electric signal is supplied to the source.
Claim 31
Dependent Claim
33 words
A driving method according to claim 20, wherein the readout light is supplied to a pixel for a period such that the optical modulation substance in the pixel can change its optical state.
Claim 32
Dependent Claim
37 words
A driving method according to claim 21, wherein the optical modulation substance changes its optical state at a point in time which varies depending on the supplied light data within a period for supplying the readout light.
Claim 33
Dependent Claim
20 words
A driving method according to claim 21, wherein the optical modulation substance comprises a liquid crystal having a memory characteristic.
Claim 34
Dependent Claim
11 words
A driving method according to claim 21, wherein the optical modulation
References Cited (Backward Citations)
JPS5688193A
Cited
EP0125692A1
Cited
US4712877A
Cited
US4747671A
Cited
US4796980A
Cited
EP0361981A2
Cited
US5130830A
Cited
EP0453033A1
Cited
US5221980A
Cited
EP0512842A2
Cited
EP0514083A2
Cited
EP0573989A2
Cited
US5548420A
Cited
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