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US 9,318,062 B2Granted
Liquid crystal display device and method of driving the same
AssigneeJapan Display Inc.
InventorsHiroki Tsuda, Junichi Kobayashi
Life of this patent
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Abstract
According to one embodiment, a liquid crystal display device includes a driving module configured to apply a DC bias to a voltage corresponding to a gradation which is displayed on a pixel and to supply a resultant voltage to a pixel electrode, the driving module being configured to apply a higher DC bias in a white display state in which a potential difference is produced between a pixel electrode and a common electrode than in a black display state in which no potential difference is produced between the pixel electrode and the common electrode.
Claims21
A liquid crystal display device comprising:
- a first substrate including a switching element disposed in each of pixels of an active area, a common electrode disposed over a plurality of pixels, a pixel electrode electrically connected to the switching element and disposed in each of the pixels, and a first alignment film;
- a second substrate including a second alignment film which is opposed to the first alignment film;
- a liquid crystal layer including liquid crystal molecules held between the first alignment film and the second alignment film;
- and
- a driving module configured to apply a DC bias to a voltage corresponding to a gradation which is displayed on the pixel and to supply a resultant voltage to the pixel electrode, the driving module being configured to apply a higher DC bias in a white display state in which a potential difference is produced between the pixel electrode and the common electrode than in a black display state in which no potential difference is produced between the pixel electrode and the common electrode,
- wherein the driving module is configured to apply the DC bias of a negative polarity on a low gradation side near the black display state, and the DC bias of a positive polarity on a high gradation side near the white display state.
3 more elements
A method of driving a liquid crystal display device, the liquid crystal display device comprising:
- a first substrate including a switching element disposed in each of pixels of an active area, a common electrode disposed over a plurality of pixels, an insulation film disposed on the common electrode, a pixel electrode electrically connected to the switching element, disposed in each of the pixels on the insulation film and having a slit formed to face the common electrode, and a first alignment film covering the pixel electrode;
- a second substrate including a second alignment film which is opposed to the first alignment film;
- and
- a liquid crystal layer including liquid crystal molecules held between the first alignment film and the second alignment film,
- the method comprising applying a higher DC bias in a white display state in which a potential difference is produced between the pixel electrode and the common electrode than in a black display state in which no potential difference is produced between the pixel electrode and the common electrode, at a time of applying a DC bias to a voltage corresponding to a gradation which is displayed on the pixel and supplying a resultant voltage to the pixel electrode,
- wherein the DC bias has a negative polarity on a low gradation side near the black display state, and the DC bias has a positive polarity on a high gradation side near the white display state.
3 more elements
A method of driving a liquid crystal display device, the liquid crystal display device comprising:
- a first substrate including a switching element disposed in each of pixels of an active area, a common electrode disposed over a plurality of pixels, a pixel electrode electrically connected to the switching element and disposed in each of the pixels, and a first alignment film;
- a second substrate including a second alignment film which is opposed to the first alignment film;
- and
- a liquid crystal layer including liquid crystal molecules held between the first alignment film and the second alignment film,
- the method comprising applying a higher DC bias in a white display state in which a potential difference is produced between the pixel electrode and the common electrode than in a black display state in which no potential difference is produced between the pixel electrode and the common electrode, at a time of applying a DC bias to a voltage corresponding to a gradation which is displayed on the pixel and supplying a resultant voltage to the pixel electrode,
- wherein the DC bias has a negative polarity on a low gradation side near the black display state, and the DC bias has a positive polarity on a high gradation side near the white display state.
3 more elements
Dependencies are inferred from the claim text.