Display driving circuit

A display drive and circuit technology, applied in TV, electrical components, color TV, etc., can solve the problems of still image quality degradation, insufficient brightness, and slow response speed of liquid crystal

Inactive Publication Date: 2015-03-25
SYNAPTICS JAPAN GK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Embodiment approach 1

[0135] "Structure of Display Driver"

[0136] figure 1 It is a diagram showing the configuration of the display driving device according to Embodiment 1 of the present invention.

[0137] exist figure 1 Among them, reference numeral 100 is a portable terminal, reference numeral 105 is a display portion of the portable terminal 100, that is, a liquid crystal panel, reference numeral 101 is a liquid crystal drive circuit for driving the liquid crystal panel 105, and reference numeral 102 is a central processing unit (CPU: Central) for controlling the portable terminal 100. Processing Unit), reference numeral 103 is a memory for temporarily storing display data, etc., and reference numeral 104 is an internal bus connected to the CPU 102, memory 103, and liquid crystal drive circuit 101 to transmit data to each other.

[0138]The liquid crystal drive circuit 101 includes: an interface circuit 106 for receiving display images and instructions for display, etc. from an internal ...

Embodiment approach 2

[0225] Figure 13 It is a diagram showing the configuration of a display driving device according to Embodiment 2 of the present invention.

[0226] Figure 13 The display driving device according to Embodiment 2 of the present invention and figure 1 The difference between the shown display driving device according to Embodiment 1 of the present invention lies in the following points.

[0227] First, the difference is that in Figure 13 In the display driving device according to Embodiment 2 of the present invention shown, the display area of ​​the liquid crystal panel 105 can be divided into a plurality of display areas 1301 to 1306 .

[0228] Thus, in Figure 13 In the shown display driving device according to Embodiment 2 of the present invention, since the display area of ​​liquid crystal panel 105 can be divided into a plurality of display areas 1301 to 1306 , display driving circuit 101 includes area determination register 1308 . Therefore, according to the value set...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36H04N19/625H04N19/124G02F1/133G09G3/20H04N5/66
CPCG09G3/3648G09G2320/103H04N19/124H04N19/42G09G2340/02G09G2340/16G09G2320/0252H04N19/172H04N19/60G09G2320/0686H04N19/146G09G2320/0261
Inventor 片山由佳利赤井亮仁黑川能毅内田裕介
Owner SYNAPTICS JAPAN GK
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