Liquid crystal display device with controllable viewing angle and driving method thereof
First Claim
1. A liquid crystal display device comprising:
- an upper substrate on which an upper substrate common electrode is disposed,a lower substrate parallel to the upper substrate on which a pixel electrode is disposed, anda liquid crystal layer sandwiched between the upper substrate and the lower substrate, and liquid crystal molecules are arranged perpendicular to the upper substrate in substance when no voltage is applied,wherein dielectric anisotropy of the liquid crystal molecules is negative,wherein a plurality of parallel strip-like lower substrate common electrodes are disposed on the lower substrate,wherein the liquid crystal display device is adapted to perform a first viewing angle mode by applying a voltage between the upper substrate common electrode and the pixel electrode to generate an electric field perpendicular to the upper substrate,wherein the liquid crystal display device is adapted to perform a second viewing angle mode by applying a voltage between the lower substrate common electrode and the pixel electrode to generate an electric field perpendicular to the upper substrate and an electric field parallel to the upper substrate, andwherein viewing direction in the first viewing angle mode is perpendicular to that in the second viewing angle mode.
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Abstract
A liquid crystal display device with controllable viewing angle of the present invention has an upper substrate (101) on which an upper substrate common electrode (103) is disposed, a lower substrate (102) on which a pixel electrode is disposed, and a liquid crystal layer (107) sandwiched between the upper substrate (101) and the lower substrate (102). The liquid crystal molecules are vertical to the upper substrate (101) in substance when no voltage is applied, and a plurality of parallel strip-like lower substrate common electrodes (104) are disposed on the lower substrate (102). The upper substrate common electrode (103) and the pixel electrode (105) provide an electric field perpendicular to the upper substrate (101) in order to form a first viewing angle mode when a voltage is applied, the lower substrate common electrode (104) and the pixel electrode (105) provide an electric field perpendicular to the upper substrate (101) and an electric field parallel to the upper substrate (101) in order to form a second viewing angle mode when a voltage is applied. A method of driving the said liquid crystal display device is also disclosed.
17 Citations
9 Claims
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1. A liquid crystal display device comprising:
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an upper substrate on which an upper substrate common electrode is disposed, a lower substrate parallel to the upper substrate on which a pixel electrode is disposed, and a liquid crystal layer sandwiched between the upper substrate and the lower substrate, and liquid crystal molecules are arranged perpendicular to the upper substrate in substance when no voltage is applied, wherein dielectric anisotropy of the liquid crystal molecules is negative, wherein a plurality of parallel strip-like lower substrate common electrodes are disposed on the lower substrate, wherein the liquid crystal display device is adapted to perform a first viewing angle mode by applying a voltage between the upper substrate common electrode and the pixel electrode to generate an electric field perpendicular to the upper substrate, wherein the liquid crystal display device is adapted to perform a second viewing angle mode by applying a voltage between the lower substrate common electrode and the pixel electrode to generate an electric field perpendicular to the upper substrate and an electric field parallel to the upper substrate, and wherein viewing direction in the first viewing angle mode is perpendicular to that in the second viewing angle mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A driving method for a liquid crystal display device, the liquid crystal display device comprising:
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an upper substrate on which an upper substrate common electrode is disposed, a lower substrate parallel to the upper substrate on which a pixel electrode is disposed, and a liquid crystal layer sandwiched between the upper substrate and the lower substrate, liquid crystal molecules are perpendicular to the upper substrate in substance when no voltage is applied, wherein dielectric anisotropy of the liquid crystal molecules is negative, and wherein a plurality of parallel strip-like lower substrate common electrodes are disposed on the lower substrate, the driving method comprising the following steps; applying a voltage between the upper substrate common electrode and the pixel electrode to generate an electric field perpendicular to the upper substrate and thus provide a first viewing angle mode; applying a voltage between the lower substrate common electrode and the pixel electrode to generate an electric field perpendicular to the upper substrate and an electric field parallel to the upper substrate and thus provide a second viewing angle mode; and switching between the first viewing angle mode and the second viewing angle mode by selectively applying the voltage to the upper substrate common electrode or the lower substrate common electrode, wherein a direction in the first viewing angle mode is perpendicular to that in the second viewing angle mode. - View Dependent Claims (9)
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Specification