Backlight Partition Control for Double-Cell Display Halation
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Solution Overview
Problem
Display devices with a double-cell panel structure suffer from low brightness, halation, and light leakage due to inadequate brightness control and light diffusion issues.
Innovation Solution
A display device comprising a backlight module, a first display panel, and a second display panel, where a processor adjusts the light-emitting brightness of each backlight partition based on grayscale information and light diffusion coefficients, and corrects the brightness to achieve optimal grayscale and color correction for improved contrast and peak brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a double-cell display panel structure is used to improve display contrast, then contrast effect is improved, but display brightness and peak brightness become low
Solution Approach 1:
The backlight module is divided into multiple independently controllable backlight partitions, allowing selective dimming or turning off of specific regions. This segmentation enables local brightness control without affecting the entire display, thereby maintaining high display brightness while improving contrast in specific areas where it is needed.
2Illumination intensity
If a double-cell display panel structure is used to improve display contrast, then contrast effect is improved, but halation and light leakage occur
Solution Approach 1:
By segmenting the backlight into multiple partitions and controlling them independently, the patent can turn off or dim backlight partitions adjacent to dark image regions. This prevents light from leaking into areas where it should not be present, thereby reducing halation effects while maintaining the contrast benefits of the double-cell structure.
Solution Approach 2:
The patent applies different brightness levels to different regions of the display based on local image content requirements. By adjusting the brightness of specific backlight partitions according to the local grayscale values of the displayed image, it achieves optimal contrast in each region while preventing light leakage into adjacent regions, thus eliminating halation without compromising overall display contrast.
3Manufacturing precision
If traditional brightness control methods are used in double-cell panels, then manufacturing is simpler, but brightness uniformity and image quality deteriorate
Solution Approach 1:
The patent implements dynamic brightness control where the backlight partition brightness is continuously adjusted based on the grayscale values of the displayed image content. This dynamic adjustment ensures high brightness uniformity across different display scenarios without requiring complex manufacturing precision, as the system adapts to different content automatically.
Solution Approach 2:
The system uses the grayscale matrix of the displayed image as feedback to control the backlight partition brightness. By continuously monitoring the image content and adjusting the backlight accordingly, the patent achieves high brightness uniformity and image quality without needing complex manufacturing processes, as the control system compensates for variations dynamically.
Data Source
AI summary
A display device and a display control method, and the display device includes: a backlight module, a first display panel, and a second display panel, and a processor. The processor is configured to: acquire a pixel grayscale matrix of an image to be displayed; determine desired brightness of each pixel by using a grayscale-brightness curve of the second display panel based on the pixel grayscale matrix; determine set light-emitting brightness of backlight partition according to grayscale information in the pixel grayscale matrix corresponding to the backlight partition; obtain a first corrected brightness of each backlight partition based on light diffusion coefficients of the plurality of backlight partitions; determine a grayscale of pixel unit according to a brightness difference between the first corrected brightness and the desired brightness; obtain a second corrected brightness of the backlight partition.