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display drive circuit

A display driver and circuit technology, applied in static indicators, instruments, etc., can solve the problems of large area of ​​frame memory chip and inability to add frame memory for maintaining image processing results, and achieve the effect of reducing power consumption

Active Publication Date: 2020-09-15
SYNAPTICS JAPAN GK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the technique described in Patent Document 4, a frame memory is required for comparing image data between a plurality of frames, and furthermore, in the image processing described in Patent Documents 1 to 3, if it is not necessary to hold one frame If there is another frame memory for the image processing results of a large amount, it is impossible to stop the image data supply from the host processor and stop the image processing when the image is still.
At this time, the chip area occupied by the frame memory in the display driver IC (Integrated Circuit) is extremely large, and therefore, due to cost constraints, it is not possible to add a frame memory for storing image processing results

Method used

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Examples

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Embodiment approach 1

[0102] figure 1 It is a block diagram showing a configuration example of the display driving circuit 30 according to the first embodiment.

[0103] The display drive circuit (display driver) 30 is connected to the display panel 50 , its backlight (back light) 60 , and a host processor (Host, host) 40 , and outputs images to the display panel 50 based on image data supplied from the host processor 40 . The source electrode is driven by a source signal and controls the backlight 60 . The control method at this time is, for example, the aforementioned CABC. The frequency distribution (histogram) of the luminance of the image data of one frame is obtained, and the luminance of the backlight 60 is lowered according to the maximum luminance. On the other hand, the output of the source signal is shifted to the high luminance side (increasing the transmittance in the LCD) side) processing, thereby reducing power consumption by an amount that lowers the brightness of the backlight wh...

Embodiment approach 2

[0130] Figure 4 It is a block diagram showing a configuration example of the display driving circuit 30 according to the second embodiment.

[0131] and figure 1Similarly to the display driving circuit 30 of Embodiment 1 shown, the display driving circuit (display driver) 30 is connected to the display panel 50, its backlight 60, and the host processor (Host, host) 40, and the output is based on the output from the host processor 40. The supplied image data is a source signal for driving source electrodes of the display panel 50 to control the backlight 60 . The display driver 30 also includes an I / F module 10, a backlight control circuit 11, an image processing IP1, a detection circuit 6, a clock (CLK) control circuit 7, a register 8, a data latch 12, a grayscale voltage selection circuit 13, and The image processing IP1 is composed of a source driver 14, and the image processing IP1 includes a parameter generation unit 2 composed of a data extraction circuit 3 and an anal...

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Abstract

A circuit apparatus is provided for driving source electrodes of a display panel based on image data and to control a backlight of the display panel. For example, the circuit apparatus includes a display drive (DD) circuit having a parameter generation (PG) part and an image data conversion (IDC) part. The PG part is operable to generate an image data-conversion parameter and a backlight control parameter based on a brightness distribution of the image data of one frame. The IDC part is operable to convert the image data based on the image data-conversion parameter. The DD circuit is operable to output source signals generated based on the converted image data and output, control the backlight based on the backlight control parameter, and stop an action of the parameter generation part in response to no change in the image data of one frame from image data of a preceding frame being detected.

Description

technical field [0001] The present invention relates to a display driving circuit, and in particular, it can be preferably used in a display driving circuit accompanying backlight control. Background technique [0002] In recent years, the size of display panels such as liquid crystal display (LCD: Liquid Crystal Display) panels has been increased, and the reduction of power consumption by backlight control and the accompanying requirements for image quality have become stricter. In response to this demand, for example, a backlight control method based on a histogram of a displayed image called CABC (Contents Adaptive Backlight Control), and a method for improving image quality along with it have been proposed. Image processing called CE (Color Enhancement, Color Enhancement). [0003] Patent Documents 1 and 2 disclose a display driver that performs a backlight control method based on the above-mentioned image histogram. [0004] Patent Document 3 discloses a display drive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34G09G3/36
CPCG09G3/2096G09G2310/08G09G2320/0247G09G2320/0626G09G2320/064G09G2320/0646G09G2330/022
Inventor 四方淳史
Owner SYNAPTICS JAPAN GK