Liquid crystal display apparatus and driving method
View Patent ↗An object of the invention is to improve the moving-picture quality of an active matrix type liquid crystal display apparatus. The apparatus comprises liquid crystal pixels disposed in a matrix configuration, a line drive circuit sequentially scanning each line of the pixels at every frame repeating with a predetermined frequency, and a column drive circuit writing an image signal into the pixels in sync with the sequential scanning. The frame is divided into a preceding and following sub-frame. The line drive circuit scans sequentially for the preceding and a following sub-frame. The column drive circuit writes an image signal originally assigned to a frame into the pixels for the preceding sub-frame, and then writes an image signal for adjusting the image quality into the pixels for the following sub-frame. The image signal for adjusting the image quality is obtained by operating the image signal assigned to the frame and an image signal assigned to the next frame.
1. A driving method of a liquid crystal display apparatus including a plurality of liquid crystal pixels disposed in a row-column matrix configuration, a line drive circuit sequentially scanning each line of said liquid crystal pixels at every frame repeating with a predetermined frequency, and a column drive circuit writing an image signal into said liquid crystal pixels in sync with said sequential scanning, comprising the steps of:
dividing said every frame into a preceding sub-frame and a following sub-frame,
performing said sequential scanning for said preceding sub-frame, and performing said sequential scanning again for said following sub-frame, and
writing an image signal originally assigned to a frame pertain into said liquid crystal pixels in sync with said sequential scanning for said preceding sub-frame, and writing an image signal for adjusting image quality into said liquid crystal pixels in sync with said sequential scanning for said following sub-frame, said image signal for adjusting image quality being obtained by performing a reduction operation on said image signal originally assigned to a frame pertain, wherein:
said image signal for adjusting image quality, which is obtained by reducing said image signal originally assigned to a frame pertain by half, is written into said liquid crystal pixels.
2. A driving method of a liquid crystal display apparatus according to claim 1 , wherein:
said image signals are written into said liquid crystal pixels having a response characteristic of 10 msec or less.
3. A liquid crystal display apparatus including a plurality of liquid crystal pixels disposed in a row-column matrix configuration, a line drive circuit sequentially scanning each line of said liquid crystal pixels at every frame repeating with a predetermined frequency, and a column drive circuit writing an image signal into said liquid crystal pixels in sync with said sequential scanning, wherein:
said every frame is divided into a preceding sub-frame and a following sub-frame,
said line drive circuit performs said sequential scanning for said preceding sub-frame, and performs said sequential scanning again for said following sub-frame, and
said column drive circuit writes an image signal originally assigned to a frame pertain into said liquid crystal pixels in sync with said sequential scanning for said preceding sub-frame, and writes an image signal for adjusting image quality into said liquid crystal pixels in sync with said sequential scanning for said following sub-frame, said image signal for adjusting image quality being obtained by performing a reduction operation on said image signal originally assigned to a frame pertain, wherein:
said column drive circuit writes said image signal for adjusting image quality, which is obtained by reducing said image signal originally assigned to a frame pertain by half, into said liquid crystal pixels.
4. A liquid crystal display apparatus according to claim 3 , wherein:
said liquid crystal pixels have a response characteristic of 10 msec or less for an image signal to be written.