Adaptive stepping-control system and method of dynamic backlight control

Abstract

The invention relates to adaptive stepping-control system and method of dynamic backlight control (DBLC). A stepping-control unit regulates the output of a backlight control device to ensure that illumination of backlight generated by the backlight unit is slowly changed, wherein the illumination change amount (i.e. stepping rate) of the backlight in per unit time is changed according to the content of image data.

Description

technical field [0001] The present invention relates to a dynamic backlight control, in particular to an adaptive stepping-control system and method for dynamic backlight control. Background technique [0002] Backlight is a technology used to illuminate a flat panel display (such as a liquid crystal display) from the back or side. The light source can be a cold cathode tube (CCFL), light emitting diode (LED) or other light source. [0003] The constant backlight will provide stable and fixed light no matter how the image data or surrounding light changes. One of the disadvantages of fixed backlights is that there is light leakage when displaying black levels ("0"), resulting in poor dynamic contrast characteristics. [0004] In order to increase the contrast, a dynamic backlight (DBL) technology must be used, which dynamically or adaptively adjusts the brightness of the overall or specific part of the backlight according to the distribution of image data or ambient light....

AI Technical Summary

Problems solved by technology

However, this conventional technique does not work well when the brightness of adjacent frames varies greatly, such as in animation or film

For example, when the backlight illumination is at figure 1 When the rising step shown increases, if the light frame suddenly changes to a dark frame at this time, the backlight illuminance will immediately change to a descending step, thus causing the target illuminance value (V+4) of the previous frame to be completely changed. unreachable

[0007] It can be seen that the traditional backlight control cannot keep up with the change of the image, obviously there are still inconveniences and defects, and further improvement is urgently needed

In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure and method for general products and methods to solve the above-mentioned problems. This is obviously a problem that relevant industry players are eager to solve

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