Display device and driving method thereof

A display device with an adjustable viewing angle, comprising:

• a pixel array at least comprising a first pixel group and a second pixel group, wherein each of the first and second pixel groups at least comprises a first sub-pixel and a second sub-pixel, wherein
• each the first sub-pixel comprises a plurality of first electrodes which are substantially parallel with each other;
• and
• each the second sub-pixel comprises a plurality of second electrodes which are substantially parallel with each other, but not parallel with the first electrodes which are substantially parallel with each other;
• wherein
• when the display device is operated in a wide viewing angle mode, each of the first and second sub-pixels has an on-axis brightness at a predetermined gray level between 0 and 255, wherein the on-axis brightness at the predetermined gray level between 0 and 255 has a first critical range and a second critical range such that the on-axis brightness at the predetermined gray level between 0 and 255 is divided into a first range, a second range and a third range, the first critical range is between the first range and the second range, and the second critical range is between the second range and the third range,
• wherein the first critical range is substantially ranged from 192 to 232 and the second critical range is substantially ranged from 10 to 50;
• and
• when the display device is operated in a narrow viewing angle mode, one of the following can be selected:
• a) when the on-axis brightness at the gray levels of the first sub-pixel and the second sub-pixel is located in the first range, the ratio of the on-axis brightness at the gray level of the first sub-pixel to the on-axis brightness at the gray level of the second sub-pixel is substantially ranged from 0.3 to 1;
• b) when the on-axis brightness at the gray levels of the first sub-pixel and the second sub-pixel is located in the second range, the ratio of the on-axis brightness at the gray level of the first sub-pixels to the on-axis brightness at the gray level of the second sub-pixels is substantially ranged from 0 to 0.3;
• or
• c) when the on-axis brightness at the gray levels of the first sub-pixel and the second sub-pixel is located in the third range, the ratio of the on-axis brightness at the gray level of the first sub-pixels to the on-axis brightness at the gray level of the second sub-pixels is substantially ranged from 0.1 to 1.

A method for driving a display device with an adjustable viewing angle, comprising:

• providing a display device comprising a pixel array at least having a first pixel group and a second pixel group, each of the first and second pixel groups at least comprising a first sub-pixel and a second sub-pixel, wherein the first sub-pixel comprises a plurality of first electrodes which are substantially parallel with each other, and the second sub-pixels comprises a plurality of second electrodes which are substantially parallel with each other, wherein the second electrodes are not parallel to the first electrodes which are substantially parallel with each other;
• in a wide viewing angle mode, each of the first and second sub-pixels having an on-axis brightness at a predetermined gray level between 0 and 255, wherein the on-axis brightness at the predetermined gray level between 0 and 255 has a first critical range and a second critical range such that the on-axis brightness at the predetermined gray level between 0 and 255 is divided into a first range, a second range and a third range, the first critical range is between the first range and the second range, and the second critical range is between the second range and the third range, wherein the first critical range is substantially ranged from 192 to 232 and the second critical range is substantially ranged from 10 to 50;
• and
• in a narrow viewing angle mode, availably selecting one of the following:
• a) when the on-axis brightness at the gray levels of the first sub-pixel and the second sub-pixel is located in the first range, the ratio of the on-axis brightness at the gray level of the first sub-pixel to the on-axis brightness at the gray level of the second sub-pixel is substantially ranged from 0.3 to 1;
• b) when the on-axis brightness at the gray levels of the first sub-pixel and the second sub-pixel is located in the second range, the ratio of the on-axis brightness at the gray level of the first sub-pixels to the on-axis brightness at the gray level of the second sub-pixels is substantially ranged from 0 to 0.3;
• and
• c) when the on-axis brightness at the gray levels of the first sub-pixel and the second sub-pixel is located in the third range, the ratio of the on-axis brightness at the gray level of the first sub-pixels to the on-axis brightness at the gray level of the second sub-pixels is substantially equal to 0.

A method for driving a display device with an adjustable viewing angle, comprising:

• providing a display device comprising a pixel array at least having a first pixel group and a second pixel group, each of the first and second pixel groups to at least comprising a first sub-pixel and a second sub-pixel, wherein each of the first sub-pixels comprises a plurality of first electrodes which are substantially parallel with each other, and each of the second sub-pixels comprises a plurality of second electrodes which are substantially parallel with each other, wherein the second electrodes are not parallel to the first electrodes which are substantially parallel with each other;
• in a wide viewing angle mode, each of the first and the second sub-pixels having an on-axis brightness at a predetermined gray level between 0 and 255;
• and
• in a narrow viewing angle mode, when an on-axis brightness of each of the first and second sub-pixels is less than an on-axis brightness corresponding to a first critical gray level, the on-axis brightness of each the first sub-pixel is an on-axis brightness at a gray level of 0, wherein the first critical gray level is an integer between about 160 and about 220, and
• when an on-axis brightness of each of the first and second sub-pixels is greater than the on-axis brightness corresponding to the first critical gray level, the on-axis brightness of each the second sub-pixel is an on-axis brightness at a gray level of 255.