Display current limiting method and device

Abstract

The invention discloses a current limiting method and device for a display screen. The current limiting method comprises the following steps: taking out the three-primary-color gray scales of all pixel units in the image input to the display screen; converting the three-primary-color gray scales of each pixel unit from RGB space to YCbCr space; constructing a current limiting look-up table to The brightness of each pixel unit is the index address, and the corresponding brightness offset is found in the current limit lookup table to calculate the new brightness; after replacing the original brightness with the new brightness of each pixel unit, convert from the YCbCr space to RGB space to obtain a new three-primary gray scale; and re-display the image input to the display screen according to the new three-primary gray scale of each pixel unit. Thus, the luminance of those high grayscale pixel units is reduced, and the luminance of the low grayscale pixel units remains unchanged, and the current limiting effect is prominent under the condition of the same image quality.

Description

technical field [0001] The invention relates to the display field, in particular to a current limiting technology of a display screen. Background technique [0002] Compared with other display screens (such as LCD, etc.), AMOLED (active matrix organic light-emitting diode, English: Active-matrix organic light-emitting diode) screen has many advantages, such as good image display effect, wide viewing angle range, short response time, etc. Wait. However, since the AMOLED displays by self-emission of the built-in light-emitting device OLED, its lifetime depends on the OLED. For high-grayscale pixel units, the current flowing through the OLED is relatively large, which will aggravate heat generation and accelerate the aging of the OLED device. Therefore, the aging of the AMOLED screen will be accelerated accordingly. In order to slow down the aging problem caused by this high current, it is necessary to reduce the current, however, reducing the current will inevitably affect t...

AI Technical Summary

Problems solved by technology

The lookup table used in this technology limits both high brightness and low brightness, so it seriously affects the visual effect of low brightness part of the image details. Although the current limit is realized, the visual effect of image display is seriously affected. The loss outweighs the gain

Some researchers have proposed such a technology, that is, using the high light efficiency characteristics of the white photon sub-pixel W to achieve current limitation without affecting the brightness of the image, but it is only applicable to RGBW display screens.

[0004] To sum up, the above-mentioned technologies all have certain defects, or they cannot take into account the strength of current limitation and the visual effect of the processed image, or they are only suitable for display screens with a single pixel structure.

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