Color temperature dynamic regulation method

Abstract

Via recognizing the image hue info of each frame and adopting accordingly different color temperatures (CT), the background lights (BL) of different CT are adopted for different pictures to ensure more lively beautiful pictures. This CT dynamically regulation method includes steps of: (1) firstly, determining the hue tropism (HT) of single image element (IE) on one frame picture; (2) making statistic of numbers of lean-red / lean-blue IEs of this frame picture; (3) comparing numbers of lean-red / lean-blue IEs of this frame picture to determine HT of this frame; (4) according to the determined HT, regulating CT of BL, i.e. controlling the brightness values of the red / blue LEDs. This offered CT dynamically regulation method ensures the vivid color of the picture and boosts the visible enjoyment. Besides, the brightness of blue light is reduced relatively when the picture appears low CT. It raises the luminescence efficiency of BL and reduces energy consumption.

Description

technical field [0001] The invention relates to the improvement of the image of the display device, in particular to a method for adjusting the color temperature of the LED backlight display device. Background technique [0002] In the display characteristics of color TV, color temperature is an important indicator. When performing color reproduction on video images, it is necessary to define a standard white, and then use the standard white as a reference point for generating other colors. Color temperature is one way to describe standard white. [0003] In fact, the color temperature of white is not a definite value, but a range. Generally, the color temperature range from 2800K to 10000K can be called white color temperature. The higher the color temperature, the cooler the blue-blue color will be, and the warmer the reddish-yellow color will be when the color temperature is lower. That is, when the blue component is high, the color temperature is relatively high; when...

AI Technical Summary

Problems solved by technology

When the color temperature is set to a higher state, such as 9300K, the color performance of cool-toned natural scenes such as blue sky, sea, forest, and grassland on the screen is better, while human skin may turn blue, and warm-toned scenes such as flowers are also not good. Not bright enough; on the contrary, set the color TV to a lower color temperature state, such as 6500K (reference white recommended by CIE and Chinese standards) or 6770K (reference white of NTSC TV system). However, natural scenery with cool tones such as forests and grasslands appear yellowish, spring is like autumn, and blue sky and sea give people a gray and unclear feeling.

In short, no matter how much the color temperature is set, the color of some scenes is always unsatisfactory.

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