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Backlight control method used for liquid crystal panel and relevant liquid crystal display device

A liquid crystal display and liquid crystal panel technology, applied in static indicators, cathode ray tube indicators, instruments, etc., can solve problems such as halo, incomplete alignment of light emitting diode light, and affecting picture quality

Inactive Publication Date: 2011-07-27
HUAYING OPTOELECTRONICS
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Problems solved by technology

[0005] However, because the light of the LED is not completely collimated, that is, it has a divergence angle (Lambertian Angle), so when the backlight brightness difference between two adjacent backlight areas is too large, the area that originally wants to display a black image will be different due to the difference. The reason for the backlight of the adjacent area is that there will be a halo at the edge, as shown in Figure 2
[0006] In short, when the difference in grayscale values ​​between adjacent backlight areas is too large, conventional methods for determining the brightness of the backlight will cause halos at the edges of the displayed image, which will affect the picture quality

Method used

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  • Backlight control method used for liquid crystal panel and relevant liquid crystal display device
  • Backlight control method used for liquid crystal panel and relevant liquid crystal display device
  • Backlight control method used for liquid crystal panel and relevant liquid crystal display device

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Embodiment Construction

[0031] Certain terms are used in the specification and subsequent claims to refer to particular components. Those of ordinary skill in the art will appreciate that manufacturers may refer to the same component by different terms. This description and subsequent patent applications do not use the difference in name as a way to distinguish components, but use the difference in function of components as a basis for distinction. The "comprising" mentioned in the entire specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "electrical connection" here includes any direct and indirect electrical connection means. Therefore, if it is described in the text that a first device is electrically connected to a second device, it means that the first device can be directly connected to the second device, or indirectly connected to the second device through other devices or connection means.

[0032] ...

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Abstract

The invention relates to a backlight control method used for a liquid crystal panel, which comprises the following steps that: the liquid crystal panel is divided into a plurality of backlight regions; a calculation expanding region and a calculation weighing region of each backlight region are set; according to a gray-scale weighted average value calculated by all pixels of the calculation expanding region and the calculation weighing region, the backlight brightness of each backlight region is determined, wherein the calculation expanding region is formed by expanding each backlight region outwards; the calculation weighing region is concentrated in the center of each backlight region; and the range of the calculation weighing region is not more than that of the calculation expanding region. The method can effectively improve the phenomenon of displaying halation generated by the edge of images when the difference of the gray-scale values between the neighboring backlight regions ofthe liquid crystal panel, thereby improving the quality of the images.

Description

technical field [0001] The invention refers to a backlight control method for a liquid crystal panel, in particular to a backlight control method for improving mutual light mixing in adjacent regions caused by regional backlights. Background technique [0002] Traditionally, the backlight module of the liquid crystal panel uses a cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL) as the light source, and as the luminous efficiency of the light-emitting diode continues to increase and the cost decreases, the light-emitting diode (Light Emitting Diode, LED) There is a tendency to gradually replace cold cathode fluorescent lamps as the light source of the backlight module. [0003] In addition, due to the fast response of light-emitting diodes, today's backlight modules can divide the liquid crystal panel into multiple backlight areas through the method of zone control, that is, zone backlight, so that the brightness of the backlight in each zone increases with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36G09G3/34G09G5/10
Inventor 苏智平蔡继中刘家麟莫启能
Owner HUAYING OPTOELECTRONICS
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