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Backlight smoothing method applied to liquid crystal display dynamic dimming and device

A dynamic dimming, liquid crystal display technology, applied in static indicators, instruments, etc., can solve the problem of discontinuous grayscale of displayed images

Active Publication Date: 2014-01-15
XI AN JIAOTONG UNIV +1
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Problems solved by technology

If the smooth transition effect of the backlight at the boundary of the partition is not corrected, or the correction is not enough, there will be a difference between the calculated value of the backlight and the actual value, which will cause grayscale discontinuity in the displayed image at the boundary of the partition

Method used

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  • Backlight smoothing method applied to liquid crystal display dynamic dimming and device
  • Backlight smoothing method applied to liquid crystal display dynamic dimming and device
  • Backlight smoothing method applied to liquid crystal display dynamic dimming and device

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Embodiment Construction

[0082] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0083] see figure 2 , the backlight brightness of each partition of the screen can be calculated by the dynamic dimming algorithm, such as figure 2 Partition A, Partition B, and Partition C in a. Ideally, the backlight in each partition should be uniform, and the brightness of the backlight between partitions should be distinct. But in practice, near the boundary of the partition, the backlight from different partitions has attenuation, diffusion and mutual superposition, so that the actual backlight brightness at the partition boundary deviates from the backlight brightness of the partition center area, similar to figure 2 The form of the smooth transition in b is shown. If the calculated value of the backlight brightness between the partitions is not smoothed, or the smoothing is not enough, there will be a large difference between the actual backligh...

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Abstract

The invention provides a backlight smoothing method applied to liquid crystal display dynamic dimming and a device. According to the backlight smoothing method, nonlinear interpolation is carried out on the known backlight brightness of the central points of four backlight partitions two times, and the backlight brightness of any pixel point in a rectangular region formed by the four points is obtained. The device for achieving the method is composed of an address selection module, a backlight brightness storage module, a lookup table module and a backlight smoothing operating module. Compared with linear interpolation, the backlight smoothing method enables backlight obtained through the nonlinear interpolation to be smoother, the smoothed backlight is made to accord with actual conditions better, the method is suitable for a side entering backlight type and a direct type backlight type, and the problem that boundary image gradation is discontinuous due to dynamic dimming is effectively solved. The device for achieving the method is simple in structure and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal display, and relates to a backlight smoothing method and device for dynamic dimming of liquid crystal display. Background technique [0002] Liquid crystal display (LCD) has become the most widely used flat panel display device due to its advantages of high resolution, light weight, and good color expression. LCD mainly consists of two parts: backlight and liquid crystal panel. For traditional display methods, the backlight source remains fully bright to provide a constant backlight for the liquid crystal, and the liquid crystal acts as a light valve to control the transmittance of light to achieve the purpose of displaying images. Because the backlight is always fully bright and the liquid crystal display has light leakage, the traditional method has disadvantages such as high power consumption and low contrast. Dynamic dimming technology can effectively reduce the power consumption of L...

Claims

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Application Information

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IPC IPC(8): G09G3/36G09G3/34
Inventor 张小宁屠震涛李超梁志虎杨雷李纯怀李浩何振伟朱立伟
Owner XI AN JIAOTONG UNIV
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