Display driving circuit

Abstract

The display driving circuit includes: an OD (OverDrive) calculation circuit operable to generate an OD driving signal for improving the response characteristic of a display device according to display image data; a drive-output circuit operable to supply an OD driving signal to the display device; and a compression circuit operable to store compressed display data in a memory. The compression circuit includes a DCT calculation module operable to execute DCT (Discrete Cosine Transform) of display image data, and an entropy coding module operable to execute variable length entropy coding of DCT conversion display data. Preferably, the display driving circuit further includes a decompression circuit operable to supply an OD calculation circuit with display data resulting from decompression of compressed display data read out the memory.

Description

technical field [0001] The present invention relates to a display driving circuit, and more particularly to a technology that can be effectively used to reduce image quality degradation by reducing the storage capacity of a memory for overdriving a display driving circuit for improving the response characteristics of a display device (overdriving: overdrive activation) to store the display grayscale of 1 frame ago. Background technique [0002] In recent years, television images such as terrestrial digital broadcasting (one-segment broadcasting) are generally being displayed on mobile devices such as mobile phones. In addition, the provision of game software and the like for mobile phones has also increased, and the demand for clearly displaying moving images on mobile phones has also increased. [0003] Generally, overdrive (hereinafter abbreviated as OD) is used as a method of improving the response characteristics of liquid crystal displays, but in principle a frame memo...

AI Technical Summary

Problems solved by technology

However, the response speed of liquid crystal is slow, so even if the applied voltage is switched rapidly, such as Figure 8 As shown in (d), the response speed of the brightness of the liquid crystal panel is also slow, and the target brightness is not reached after one frame period (after 1 / 60 second), resulting in insufficient brightness 802

However, if OD processing is performed using an image quantized (compressed) and expanded from an image 1 frame earlier and the current uncompressed image, an error occurs due to compression, and a still image is judged to be a moving image. OD processing is performed, so there is a problem of deteriorating the image quality of still images

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