Patent US6816142B2 successfully refreshed from Google Patents.
US6816142B2
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Liquid crystal display device
Assignee: Mitsubishi Electric Corp
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Filing: 2001-11-13
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Granted: 2004-11-09
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Expires: 2021-11-13
Abstract
Abstract A liquid crystal display device comprising a signal correcting means for correcting a level of an original image signal to a level with which transmittance in a steady state of the pixel with the original image signal is attained within one frame period, a horizontal driving means for applying a voltage in correspondence with the corrected image signal to liquid crystal, and an illumination device for illuminating the display panel with a plurality of light emitting regions thereof, said light emitting regions sequentially turns on and off in synchronization with the application of the corrected image signal while holding a definite time delay thereto.
Inventors
- 👤 Kyoichiro Oda
- 👤 Akimasa Yuuki
- 👤 Shin Tahata
- 👤 Toshio Tobita
- 👤 Shiro Miyake
- 👤 Kazuhiro Kobayashi
- 👤 Keiichi Murayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:25
CPC Classifications
A; A63; A63J; A63J1/00; A63J1/02; G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3406; G09G3/342; A63C; A63C19/00; A63C19/005; A63J5/00; A63J5/02; G09G3/2007; G09G3/2011; G09G3/36; G09G3/3611; G09G3/3648; G09G2310/00; G09G2310/02; G09G2310/0224; G09G2310/024; G09G2310/06; G09G2310/061; G09G2310/08; G09G2320/00; G09G2320/02; G09G2320/0252; G09G2320/0261; G09G2320/0285; G09G2320/04; G09G2320/041; G09G2320/06; G09G2320/0626; G09G2320/0633; G09G2320/064; G09G2340/00; G09G2340/16
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
192 words
A liquid crystal display device comprising: display panel having pixels arranged in a matrix-like row and column configuration in a display area and switching means connected to each of the pixels, a vertical driving circuit for scanning the display area of the display panel in one frame period by selecting the rows of pixels alternately while turning on the switching means connected to the pixels of the rows of pixels, and horizontal driving means for applying a voltage, which corresponds to an image signal, to each pixel in the row selected by turning on the switching means, signal correcting means for generating a corrected image signal using a transmittance of a previous frame to determine a voltage level necessary for attaining a desired transmittance in a current frame, within one frame period, and for providing the corrected image signal to the horizontal driving means, and an illumination device having a plurality of light emitting regions for illuminating the display panel, the light emitting regions sequentially turning on and off in synchronization with selection of the rows of each light emitting region, while maintaining a definite time delay in the selection of rows.
Claim 2
Dependent Claim
192 words
A liquid crystal display device comprising: display panel having pixels arranged in a matrix-like row and column configuration in a display area and switching means connected to each of the pixels, a vertical driving circuit for scanning the display area of the display panel in one frame period by selecting the rows of pixels alternately while turning on the switching means connected to the pixels of the rows of pixels, and horizontal driving means for applying a voltage, which corresponds to an image signal, to each pixel in the row selected by turning on the switching means, signal correcting means for generating a corrected image signal using a transmittance of a previous frame to determine a voltage level necessary for attaining a desired transmittance in a current frame, within one frame period, and for providing the corrected image signal to the horizontal driving means, and an illumination device having a plurality of light emitting regions for illuminating the display panel, the light emitting regions sequentially turning on and off in synchronization with selection of the rows of each light emitting region, while maintaining a definite time delay in the selection of rows.
Claim 3
Dependent Claim
93 words
The liquid crystal display device of claim 1 comprising election means for selectively providing one of the corrected image signal and an erasure signal to the horizontal driving means, wherein the corrected image signals are provided for the pixels in even numbered rows while the erasure signal is provided for the pixels in odd numbered rows during even numbered frames, and the erasure signal is provided for the pixels in the even numbered rows while the corrected image signals are provided for the pixels in the odd numbered rows during odd numbered frames.
Claim 4
Dependent Claim
42 words
The liquid crystal display device of claim 1 comprising temperature detecting means for detecting temperature of a liquid crystal material in the display panel, wherein the signal correcting means corrects the level of an image signal using temperature detected as a parameter.
Claim 5
Dependent Claim
127 words
The liquid crystal display device of claim 1 comprising: temperature detecting means for detecting temperature of a liquid crystal material in the display panel, and election means selectively providing one of the corrected image signal and an erasure signal to the horizontal driving means, wherein the signal correcting means corrects the level of an image signal using the temperature detected as a parameter, and the corrected image signals are provided for the pixels in even numbered rows while the erasure signal is provided for the pixels in odd numbered rows during even numbered frames, and the erasure signal is provided for the pixels in the even numbered rows while the corrected image signals are provided for the pixels in the odd numbered rows during odd numbered frames.
Claim 6
Dependent Claim
24 words
The liquid crystal display device of claim 1 , in which currents flowing through respective lamps in the light emitting regions are independently controlled.
Claim 7
Dependent Claim
24 words
The liquid crystal display device of claim 1 , in which turn on periods of each of the light emitting regions are independently controlled.
Claim 8
Dependent Claim
30 words
The liquid crystal display device of claim 1 , in which turn on periods of each of the light emitting regions are divided into turn on and turn off sub-periods.
Claim 9
Dependent Claim
97 words
A liquid crystal display device in which an image signal of a current frame is externally input, a voltage, with which transmittance designated by current frame image data is attained within one frame period, is applied to the liquid crystal display device at the current frame, and the voltage applied to the liquid crystal display varies in accordance with temperature of a liquid crystal material of the liquid crystal display, wherein the voltage applied to the liquid crystal material during the current frame is determined depending on the current frame image data and previous frame image data.
Claim 10
Dependent Claim
97 words
A liquid crystal display device in which an image signal of a current frame is externally input, a voltage, with which transmittance designated by current frame image data is attained within one frame period, is applied to the liquid crystal display device at the current frame, and the voltage applied to the liquid crystal display varies in accordance with temperature of a liquid crystal material of the liquid crystal display, wherein the voltage applied to the liquid crystal material during the current frame is determined depending on the current frame image data and previous frame image data.
Claim 11
Dependent Claim
113 words
The liquid crystal display of claim 8 comprising: a temperature detection circuit for detecting the temperature of the liquid crystal material, a frame memory for storing a present frame image signal for a definite time to output a previous frame image signal, a plurality of signal conversion tables in which output data is stored in correspondence with each value of the previous frame image signal and each value of the current frame image signal, and a processor for determining the output data from the current frame image signal and the previous frame image signal by using one of the signal conversion tables selected based on the temperature detected by the temperature detection circuit.
Claim 12
Dependent Claim
44 words
The liquid crystal display of claim 9 wherein the output data in the signal conversion table is determined so that a transmittance designated by the current frame image signal is attained within one frame period by applying a voltage determined by the output data.
Claim 13
Dependent Claim
119 words
The liquid crystal display of claim 8 comprising: a temperature detection circuit for detecting the temperature of the liquid crystal material, a frame memory for storing a present frame image signal for a definite time to output a previous frame image signal, a plurality of signal conversion tables in which output data is stored in correspondence to a part of each value of the previous frame image signal and a part of each value of the current frame image signal, and a processor for determining the output data from the current frame image signal and the previous frame image signal by using one of the signal conversion tables selected based on the temperature detected by the temperature detection circuit.
Claim 14
Dependent Claim
33 words
The liquid crystal display of claim 11 wherein the frame memory stores a present frame image signal having a bit length converted for a definite time and outputs a previous frame image signal.
Claim 15
Dependent Claim
42 words
The liquid crystal display of claim 12 wherein a number of gradations, represented by a previous frame image signal having a bit length converted, is equal to a number of gradations of the previous frame image signal in the signal conversion table.
Claim 16
Dependent Claim
69 words
The liquid crystal display of claim 11 comprising a signal conversion interpolation table in which interpolation differential data is stored in correspondence to part of each value of the previous frame image signal and part of each value of the current frame image signal, wherein the processor determines output data using the signal conversion interpolation table as well as the signal conversion table selected based on the temperature detected.
Claim 17
Dependent Claim
32 words
The liquid crystal display of claim 14 wherein the frame memory stores a present frame image signal having bit length converted for a definite time and outputs a previous frame image signal.
Claim 18
Dependent Claim
122 words
A liquid crystal display device comprising: converting means for converting bit length of current frame image signal, a frame memory for storing a present frame image signal, having bit length converted, for a definite time, to output a previous frame image signal, a signal conversion table in which output data is stored in correspondence to each value of the previous frame image signal and part of each value of the current frame image signal, a processor for determining the output data from the current frame image signal and the previous frame image signal using the signal conversion table, and an illumination device for illuminating a display area of the liquid crystal display and including a plurality of horizontal stripe light emitting regions.
Claim 19
Dependent Claim
122 words
A liquid crystal display device comprising: converting means for converting bit length of current frame image signal, a frame memory for storing a present frame image signal, having bit length converted, for a definite time, to output a previous frame image signal, a signal conversion table in which output data is stored in correspondence to each value of the previous frame image signal and part of each value of the current frame image signal, a processor for determining the output data from the current frame image signal and the previous frame image signal using the signal conversion table, and an illumination device for illuminating a display area of the liquid crystal display and including a plurality of horizontal stripe light emitting regions.
Claim 20
Dependent Claim
85 words
The liquid crystal display of claim 16 further comprising: temperature detection circuit for detecting temperature of a liquid crystal material of the liquid crystal display, and a plurality of signal conversion tables in which output data is stored in correspondence to each value of the previous frame image signal and part of each value of the current frame image signal, wherein the processor determines the output data using one of the signal conversion tables selected based on the temperature detected by the temperature detection circuit.
Claim 21
Dependent Claim
111 words
A liquid crystal display device of an active matrix type wherein an interlaced image signal comprising even numbered fields and odd numbered fields is displayed, an original image signal designating a image to be displayed is corrected to enlarge a level difference between the original image signal and an erasure signal, and corrected image signals are provided for pixels in even numbered rows while an erasure signal is provided for pixels in odd numbered rows during even numbered fields, and the erasure signal is provided for the pixels in the even numbered rows while corrected image signals are provided for the pixels in the odd numbered rows during odd numbered fields.
Claim 22
Dependent Claim
111 words
A liquid crystal display device of an active matrix type wherein an interlaced image signal comprising even numbered fields and odd numbered fields is displayed, an original image signal designating a image to be displayed is corrected to enlarge a level difference between the original image signal and an erasure signal, and corrected image signals are provided for pixels in even numbered rows while an erasure signal is provided for pixels in odd numbered rows during even numbered fields, and the erasure signal is provided for the pixels in the even numbered rows while corrected image signals are provided for the pixels in the odd numbered rows during odd numbered fields.
Claim 23
Dependent Claim
89 words
The liquid crystal display device of claim 18 comprising an illumination device for illuminating the display area of the liquid crystal display with a plurality of horizontal stripe light emitting regions, wherein each light emitting region turns on only for a period which is delayed from completion of the selection of rows in each light emitting region, and the level of original image signal is corrected to a level with which transmittance in a steady state of the pixel with the original image signal is attained within one field.
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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) | 2007-11-09 | 2008-05-10 | 2008-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-11-09 | 2012-05-10 | 2012-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-11-09 | 2016-05-10 | 2016-11-09 | $7700.00 | Window Closed / Lapsed |