Display device and driving method thereof

Abstract

A display device and its driving method are proposed. The display device includes a display panel, a gate driver, and a source driver. The display panel has a plurality of driving pixels. The gate driver provides a plurality of gate drive signals to the plurality of driving pixels. The source driver distinguishes each of a plurality of frame periods as a plurality of sub-frame periods and provides a drive voltage according to the corresponding driving pixel, so that the driving pixel is in a first display state or a second display state in each sub-frame period. The source driver adjusts the number of driving pixels in the first display state or the second display state in each sub-frame period according to the display grayscale level of the driving pixel. The display brightness of the driving pixel is different in the first display state and the second display state.

Claims

1. A display device, comprising: A display panel having multiple driving pixels, wherein the display panel is a cholesteric liquid crystal panel; A gate driver, coupled to the display panel, provides a plurality of gate drive signals to the driving pixels; and a source driver, coupled to the display panel, wherein the source driver is used to distinguish each of a plurality of frame periods as a plurality of subframe periods, and to provide a drive voltage according to a corresponding driving pixel, so that the driving pixel is in a first display state or a second display state in each of the subframe periods, wherein the first display state is a planar spiral state to present a bright display state, and the second display state is a vertically aligned state to present a dark display state, wherein the source driver adjusts the number of driving pixels in the first display state or the second display state in each of the subframe periods according to the display grayscale level of the driving pixel, wherein the display brightness of the driving pixel is different in the first display state and the second display state.

2. The display device as claimed in claim 1, wherein the number of times the driving pixel is in the first display state during each of the subframes is proportional to the display grayscale level of the driving pixel.

3. The display device as claimed in claim 1, wherein during a reset period, the source driver provides the driving voltage having a first polarity or a second polarity to the driving pixel, such that the driving pixel is in the second display state during the reset period.

4. The display device as claimed in claim 3, wherein the reset period is set before or before each of the frame periods.

5. The display device as claimed in claim 1, wherein a first terminal of the driving pixel receives the driving voltage, a second terminal of the driving pixel receives a common voltage, and the source driver adjusts the voltage level of the driving voltage according to the magnitude of the common voltage.

6. The display device of claim 5, wherein when the absolute value of the voltage difference between the driving voltage and the common voltage is zero, the driving pixel is in the first display state during each of the subframes, and when the absolute value of the voltage difference between the driving voltage and the common voltage is a preset voltage, the driving pixel is in the second display state during each of the subframes.

7. A method for driving a display device, comprising: A display panel having multiple driving pixels is provided, wherein the display panel is a cholesteric liquid crystal panel; A gate driver is provided, which provides a plurality of gate drive signals to the driving pixels; a source driver is provided, which distinguishes each of a plurality of frame periods as a plurality of subframe periods; the source driver provides a drive voltage according to a corresponding driving pixel, so that the driving pixel is in a first display state or a second display state in each of the subframe periods, wherein the first display state is a planar spiral state to present a bright display state, and the second display state is a vertically aligned state to present a dark display state; and the source driver adjusts the number of driving pixels in the first display state or the second display state in each of the subframe periods according to the display grayscale level of the driving pixel, wherein the display brightness of the driving pixel is different in the first display state and the second display state.

8. The driving method as described in claim 7, wherein the number of times the driving pixel is in the first display state during each of the subframes is proportional to the display grayscale level of the driving pixel.

9. The driving method as described in claim 7, further comprising: During a reset, the source driver provides the driving voltage having a first polarity or a second polarity to the driving pixel, so that the driving pixel is in the second display state during the reset.

10. The driving method as described in claim 9, wherein the reset period is set before or before each of the frame periods.

11. The driving method as described in claim 7, further comprising: The first and second terminals of the driving pixel respectively receive the driving voltage and a common voltage; And to enable the source driver to adjust the voltage level of the drive voltage according to the magnitude of the common voltage.

12. The driving method of claim 11, wherein when the absolute value of the voltage difference between the driving voltage and the common voltage is zero, the driving pixel is in the first display state during each of the subframes, and when the absolute value of the voltage difference between the driving voltage and the common voltage is a preset voltage, the driving pixel is in the second display state during each of the subframes.

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