Liquid crystal display device and method for driving liquid crystal display device

摘要

An object of the invention is to suppress degradation in image quality of a liquid crystal display device which performs display by field sequential method and to reduce power consumption of a backlight. The highest brightness of a first color light in a pixel region is detected. Gamma correction is performed so that transmittance of a pixel of the region displaying the highest brightness of the first color light is set to maximum and transmittance of other pixel of the region is decreased in accordance with lowering of the first color light intensity, and the region is irradiated with the highest brightness of the first color light. Similarly, a second color light is irradiated in another region concurrently with irradiation of the first color, whereby input of an image signal and lighting of the backlight are performed simultaneously in every region of the pixel portion.

主权项

1. A liquid crystal display device comprising a liquid crystal panel and an image processing circuit, the image processing circuit comprising:
a frame memory configured to store at least data of an image to be displayed by the liquid crystal panel; and a maximum value detection circuit functionally connected to the frame memory, and comprising:
a first maximum value detection sub-circuit configured to detect a highest brightness of a first color tone in a first region of the image; anda second maximum value detection sub-circuit configured to detect a highest brightness of a second color tone in a second region of the image, wherein the liquid crystal display device is configured to:input in a same period a first color image signal for the first color tone in rows of pixels of the first region and a second color image signal for the second color tone in rows of pixels of the second region,write image data for the first color tone in a second row of pixels of the first region while emitting light of the first color tone in a first row of pixels of the first region, the first row immediately preceding the second row, andemit simultaneously light of the first color tone in the first row and in the second row, wherein the first region and the second region are respectively formed of first consecutive rows of pixels and second consecutive rows of pixels distinct from the first consecutive rows of pixels, each pixel being able to emit light of the first color tone and light of the second color tone, wherein the first row of pixels belongs to a first group of consecutive rows of pixels of the first region to which image data for the first color tone are written in a first period, wherein the second row of pixels belongs to a second group of consecutive rows of pixels of the first region emitting light of a color tone different from the first color tone during the first period, and wherein emission of different color tones does not occur simultaneously in the first group of consecutive rows of pixels and in the second group of consecutive rows of pixels.