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Dynamic backlight driving method

A driving method and dynamic backlight technology, applied to static indicators, instruments, etc., can solve the problems of high cost of external circuits, high cost of drive circuits, single backlight mode of direct-lit LED backlight, etc., and achieve the effect of improving smear

Inactive Publication Date: 2013-01-23
NANJING CEC PANDA LCD TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Purpose of the invention: The purpose of the present invention is to overcome the above-mentioned single backlight method that is only applicable to the direct-type LED backlight, and the problems of high external circuit cost and high drive circuit cost caused by the huge technical data of the image data

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0028] In this embodiment, the structure of a liquid crystal display with a light-emitting diode (LED) designed as a side-lit light bar is used as a backlight for illustration (this patent is not limited to the LED backlight). First, the backlight of the LED backlight is divided into multiple areas in the vertical direction. In this embodiment, the backlight of the LED backlight is divided into four areas in the vertical direction. Vertically, the area is divided into fo...

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Abstract

The invention relates to a dynamic backlight driving method which comprises the following steps of: dividing backlight into a plurality of areas in the vertical direction, wherein the brightness of a backlight source can be independently controlled by backlight in each area; for an image in each area, counting and analyzing an image gray scale of each area, and re-determining the backlight gray of each area; recalculating the image gray scale of each area according to the re-determined backlight gray of each area, so that gray values of pixels passing through the backlight is invariable; and displaying a final image picture on a liquid crystal display panel. According to the scheme, the dynamic backlight driving method is applicable to a direct type backlight mode and an edge-type backlight mode; the problems that the method is only applicable to a single backlight mode of direct type light-emitting diode (LED) backlight and the cost of an external circuit and a driving loop is relatively high due to huge technical data of image data in the prior art are effectively solved; and meanwhile, by the adoption of a pulse wave type backlight driving display panel, smears in a process of moving the image is greatly improved.

Description

technical field [0001] The invention relates to a dynamic backlight driving method, in particular to an LED backlight driving method. Background technique [0002] In conventional liquid crystal display devices, light emitting diodes (LEDs), which consume less power and can improve image quality, are used as light sources for backlights of liquid crystal panels. However, the backlight emits light at a constant brightness regardless of the video signal, and by controlling the light transmittance of the liquid crystal panel according to the brightness of the video signal, video with a desired brightness is displayed. Therefore, even in darker video, the power of the backlight does not decrease, but is consumed constantly, and the power efficiency is not good. As a countermeasure against this, there has been proposed a technique in which the luminance of the backlight is variable, and the gradation of the liquid crystal panel and the luminance of the backlight are controlled b...

Claims

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Application Information

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IPC IPC(8): G09G3/34G09G3/36
Inventor 蓝东鑫
Owner NANJING CEC PANDA LCD TECH