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US 8,149,198 B2Granted
Liquid crystal display device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsShunpei Yamazaki, Jun Koyama
Life of this patent
Estimating the term…
Abstract
Gray scale display is performed by combining time ratio gray scale and voltage gray scale in a liquid crystal display device which performs display in OCB mode. In doing so, one frame is divided into subframes corresponding to the number of bit for the time ratio gray scale. Initialize voltage is applied onto the liquid crystal upon display of a subframe.
Claims60
A liquid crystal display device comprising:
- a pixel;
- a thin film transistor in the pixel;
- source and drain electrodes over the thin film transistor;
- an insulating film comprising organic resin over the source and drain electrodes;
- a pixel electrode over the insulating film;
- an opposing electrode opposed to the pixel electrode;
- and
- a liquid crystal interposed between the pixel electrode and the opposing electrode;
- wherein a voltage higher than an analogue gray scale voltage is applied to the pixel before the analogue gray scale voltage is applied to the pixel, and
- wherein a gray scale displayed when the voltage higher than the analogue gray scale voltage is applied and a gray scale displayed when the analogue gray scale voltage is applied are substantially a same.
7 more elements
A liquid crystal display device comprising:
- a pixel;
- a thin film transistor in the pixel;
- source and drain electrodes over the thin film transistor, the source and drain electrodes comprising a laminated film comprising aluminum;
- an insulating film comprising organic resin over the source and drain electrodes;
- a pixel electrode over the insulating film;
- an opposing electrode opposed to the pixel electrode;
- and
- a liquid crystal interposed between the pixel electrode and the opposing electrode;
- wherein a voltage higher than an analogue gray scale voltage is applied to the pixel before the analogue gray scale voltage is applied to the pixel, and
- wherein a gray scale displayed when the voltage higher than the analogue gray scale voltage is applied and a gray scale displayed when the analogue gray scale voltage is applied are substantially a same.
7 more elements
A liquid crystal display device comprising:
- a pixel;
- a thin film transistor in the pixel;
- source and drain electrodes over the thin film transistor, the source and drain electrodes comprising a laminated film comprising aluminum;
- an insulating film comprising organic resin over the source and drain electrodes,
- a pixel electrode over the insulating film;
- an opposing electrode opposed to the pixel electrode;
- and
- a liquid crystal interposed between the pixel electrode and the opposing electrode;
- wherein the liquid crystal display device has an LED backlight;
- and
- wherein a voltage higher than an analogue gray scale voltage is applied to the pixel before the analogue gray scale voltage is applied to the pixel, and
- wherein a gray scale displayed when the voltage higher than the analogue gray scale voltage is applied and a gray scale displayed when the analogue gray scale voltage is applied are substantially a same.
9 more elements
A liquid crystal display device comprising:
- a pixel;
- a thin film transistor in the pixel;
- source and drain electrodes over the thin film transistor, the source and drain electrodes comprising a laminated film comprising aluminum;
- a film comprising silicon nitride over the source and drain electrodes;
- an insulating film comprising organic resin over the film comprising the silicon nitride;
- a pixel electrode over the insulating film;
- an opposing electrode opposed to the pixel electrode;
- and
- a liquid crystal interposed between the pixel electrode and the opposing electrode;
- wherein the liquid crystal display device has an LED backlight;
- wherein a voltage higher than an analogue gray scale voltage is applied to the pixel before the analogue gray scale voltage is applied to the pixel, and
- wherein a gray scale displayed when the voltage higher than the analogue gray scale voltage is applied and a gray scale displayed when the analogue gray scale voltage is applied are substantially a same.
9 more elements
A liquid crystal display device comprising:
- a pixel;
- a thin film transistor in the pixel;
- source and drain electrodes over the thin film transistor, the source and drain electrodes comprising a laminated film comprising aluminum;
- a film comprising silicon nitride over the source and drain electrodes;
- a first contact hole formed in the film comprising the silicon nitride;
- an insulating film comprising organic resin over the film comprising the silicon nitride;
- a second contact hole formed in the insulating film;
- a pixel electrode provided over the insulating film and inside the first and second contact holes;
- an opposing electrode opposed to the pixel electrode;
- and
- a liquid crystal interposed between the pixel electrode and the opposing electrode;
- wherein the liquid crystal display device has an LED backlight;
- and
- wherein a voltage higher than an analogue gray scale voltage is applied to the pixel before the analogue gray scale voltage is applied to the pixel.
11 more elements
A liquid crystal display device comprising:
- a first substrate;
- a thin film transistor formed over the first substrate;
- a pixel electrode electrically connected to the thin film transistor;
- a second substrate opposed to the first substrate, the second substrate having an inner side and an outer side;
- a liquid crystal interposed between the first substrate and the inner side of the second substrate;
- and
- a biaxial phase difference plate adjacent to the outer side of the second substrate,
- wherein a voltage higher than an analogue gray scale voltage is applied to the pixel electrode before the analogue gray scale voltage is applied to the pixel electrode, and
- wherein a gray scale displayed when the voltage higher than the analogue gray scale voltage is applied and a gray scale displayed when the analogue gray scale voltage is applied are substantially a same.
6 more elements
A liquid crystal display device comprising:
- a first substrate;
- a thin film transistor formed over the first substrate;
- a pixel electrode electrically connected to the thin film transistor;
- a second substrate opposed to the first substrate, the second substrate having an inner side and an outer side;
- a liquid crystal interposed between the first substrate and the inner side of the second substrate;
- a biaxial phase difference plate adjacent to the outer side of the second substrate;
- and
- a pair of polarizing plates whose transmission axes are substantially perpendicular to each other wherein the first and second substrates are located between the pair of polarizing plates,
- wherein a voltage higher than an analogue gray scale voltage is applied to the pixel electrode before the analogue gray scale voltage is applied to the pixel electrode, and
- wherein a gray scale displayed when the voltage higher than the analogue gray scale voltage is applied and a gray scale displayed when the analogue gray scale voltage is applied are substantially a same.
7 more elements
An electronic device having a liquid crystal display device comprising:
- a first substrate;
- a thin film transistor formed over the first substrate;
- a pixel electrode electrically connected to the thin film transistor;
- a second substrate opposed to the first substrate, the second substrate having an inner side and an outer side;
- a liquid crystal interposed between the first substrate and the inner side of the second substrate;
- and
- a biaxial phase difference plate adjacent to the outer side of the second substrate,
- wherein a voltage higher than an analogue gray scale voltage is applied to the pixel electrode before the analogue gray scale voltage is applied to the pixel electrode,
- wherein a gray scale displayed when the voltage higher than the analogue gray scale voltage is applied and a gray scale displayed when the analogue gray scale voltage is applied are substantially a same, and
- wherein a diagonal of the liquid crystal display device is 30 inches or larger.
7 more elements
An electronic device comprising:
- a first substrate;
- a thin film transistor formed over the first substrate;
- a pixel electrode electrically connected to the thin film transistor;
- a second substrate opposed to the first substrate, the second substrate having an inner side and an outer side;
- a liquid crystal interposed between the first substrate and the inner side of the second substrate;
- a biaxial phase difference plate adjacent to the outer side of the second substrate;
- and
- a pair of polarizing plates whose transmission axes are substantially perpendicular to each other wherein the first and second substrates are located between the pair of polarizing plates,
- wherein a voltage higher than an analogue gray scale voltage is applied to the pixel electrode before the analogue gray scale voltage is applied to the pixel electrode,
- wherein a gray scale displayed when the voltage higher than the analogue gray scale voltage is applied and a gray scale displayed when the analogue gray scale voltage is applied are substantially a same, and
- wherein a diagonal of the liquid crystal display device is 30 inches or larger.
8 more elements
Dependencies are inferred from the claim text.