Liquid crystal display device and method of driving the same
AssigneeJapan Display Inc.
InventorsYukio Tanaka, Toshiyuki Higano, Kenji Nakao, Hirofumi Wakemoto
Life of this patent
Estimating the term…
Abstract
According to one embodiment, a liquid crystal display device includes an array substrate, a counter substrate, a liquid crystal layer and a driving unit. The driving unit is configured to perform polarity inversion driving by applying, to the pixel electrode, positive and negative video signals. When applying the video signals to the pixel electrode, the driving unit superposes a correction signal corresponding to a polarity inversion frequency and the gray level on the video signals in advance.
Claims14
A liquid crystal display device comprising:
- an array substrate;
- a counter substrate arranged opposite to the array substrate;
- a liquid crystal layer between the array substrate and the counter substrate;
- and
- a driving unit controlling the liquid crystal layer,
- wherein the driving unit applies positive and negative video signals based on a gray level input to the driving unit,
- the driving unit superposes a bias voltage corresponding to a polarity inversion frequency and the gray level on the video signals,
- the polarity inversion frequency comprises a first polarity inversion frequency and a second polarity inversion frequency which is higher than the first polarity inversion frequency,
- the bias voltage comprises a first bias voltage corresponding to the first polarity frequency and a second bias voltage corresponding to the second polarity frequency, and
- the first bias voltage is less than the second bias voltage for each gray level.
A method of driving a liquid crystal display device comprising an array substrate, a counter substrate arranged opposite to the array substrate, a liquid crystal layer between the array substrate and the counter substrate, and a driving unit, the method comprising:
- performing polarity inversion driving by applying positive and negative video signals corresponding to a gray level of an image to be displayed by the driving unit;
- and
- when applying the video signals, superposing a bias voltage corresponding to a polarity inversion frequency and the gray level on the video signals in advance by the driving unit,
- wherein the polarity inversion frequency comprises a first polarity inversion frequency and a second polarity inversion frequency,
- the bias voltage comprises a first bias voltage corresponding to the first polarity frequency and a second bias voltage corresponding to the second polarity frequency, and
- when the first polarity inversion frequency is higher than the second polarity inversion frequency, a voltage value of the first bias voltage is not more than a voltage value of the second bias voltage for each gray level.
A liquid crystal display device comprising:
- an array substrate;
- a counter substrate arranged opposite to the array substrate;
- a liquid crystal layer between the array substrate and the counter substrate;
- and
- a driving unit controlling the liquid crystal layer,
- wherein the driving unit applies positive and negative video signals based on a gray level input to the driving unit,
- when applying the video signals, the driving unit superposes a bias voltage corresponding to a polarity inversion frequency and the gray level on the video signals in advance,
- the polarity inversion frequency comprises a first polarity inversion frequency and a second polarity inversion frequency,
- the bias voltage comprises a first bias voltage corresponding to the first polarity frequency and a second bias voltage corresponding to the second polarity frequency, and
- when the first polarity inversion frequency is higher than the second polarity inversion frequency, the first bias voltage is lower than the second bias voltage.
Dependencies are inferred from the claim text.