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

A liquid crystal display, liquid crystal panel technology, applied in static indicators, cathode ray tube indicators, instruments, etc., can solve the problems of incomplete collimation of light emitting diodes, halo, display image halo phenomenon, etc.

Inactive Publication Date: 2009-09-30
HUAYING OPTOELECTRONICS
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  • Abstract
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  • Claims
  • Application Information

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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 in the adjacent area causes halos on the edges, such as figure 2 shown
[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] In the specification and subsequent patent applications, certain words are used to refer to specific components. Those with general knowledge in the field should understand that manufacturers may use different terms to refer to the same components. The scope of this specification and subsequent patent applications does not use differences in names as a way to distinguish components, but uses differences in functions of components as a basis for distinction. The "include" mentioned in the entire manual and subsequent request items is an open term, so it should be interpreted as "include but not limited to". In addition, the term "electrical connection" here includes any direct and indirect electrical connection means. Therefore, if it is described 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...

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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 of the liquid crystal panel, thereby improving the quality of the images.

Description

Technical field [0001] The present invention refers to a backlight control method for a liquid crystal panel, in particular to a backlight control method for improving the mutual light mixing of adjacent areas caused by the area backlight. Background technique [0002] Traditionally, the backlight module of the liquid crystal panel uses Cold Cathode Fluorescent Lamp (CCFL) as the light source. As the luminous efficiency of light-emitting diodes continues to increase and the cost is decreasing, light-emitting diodes (LEDs) There is a tendency to gradually replace cold cathode fluorescent tubes as the light source of the backlight module. [0003] In addition, due to the fast response characteristics of light-emitting diodes, the current backlight module can be divided into a plurality of backlight regions by means of zone control, that is, regional backlighting, so that the backlight brightness of each region can follow the LCD panel. The picture changes and changes to some extent...

Claims

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Application Information

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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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