Backlight Zone Control for Display Halo Reduction
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Solution Overview
Problem
Display products with local light regulation suffer from a 'halo' phenomenon due to light leakage from lightened areas into extinguished areas, reducing contrast and display effectiveness.
Innovation Solution
A brightness regulating method that divides the backlight source into multiple light areas, acquires pixel quantities and grayscale values, determines brightness parameters, and adjusts brightness levels to minimize light leakage by maintaining extinguished states and adjusting lightened areas to specific brightness parameters, while also compensating for edge pixels through gradual brightness reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local light regulation is applied to improve display contrast, then brightness control is improved, but halo phenomenon occurs around lightened areas
Solution Approach 1:
The backlight source is divided into multiple independently controllable light areas (zones), allowing precise control of brightness in different regions. This segmentation enables the system to adjust specific areas without affecting others, reducing light leakage into adjacent extinguished areas and minimizing the halo phenomenon while maintaining contrast improvement benefits.
Solution Approach 2:
Different brightness parameters are applied to different light areas based on local display requirements. The system calculates average grayscale values for pixels in each light area and applies customized brightness regulation, allowing each region to have optimal brightness control tailored to its specific content and position, thereby reducing halo effects at boundaries.
2Illumination intensity
If light areas are lightened to improve visibility, then brightness is improved, but light leakage into extinguished areas increases
Solution Approach 1:
By segmenting the backlight into distinct light areas with independent control, the system can illuminate only the necessary regions while keeping adjacent areas extinguished. This prevents light from spilling into areas that should remain dark, reducing light leakage energy loss while maintaining visibility where needed.
Solution Approach 2:
The brightness of light areas is dynamically adjusted based on real-time pixel grayscale values and display content requirements. The system continuously monitors and regulates brightness parameters, optimizing the balance between visibility and light leakage prevention by adapting illumination levels to actual display needs.
Data Source
AI summary
The present disclosure provides a brightness regulating method. The brightness regulating method is applied to a displaying device. The displaying device includes a backlight module. The regulating method includes: dividing a backlight source of the backlight module into a plurality of light areas; acquiring pixel quantities and pixel grayscale values of pixels within pixel areas corresponding to each of the light areas; according to the pixel quantities and the pixel grayscale values, determining brightness parameters of the light areas; and according to the brightness parameters, regulating brightnesses of the light area. Because, in the process of the brightness regulation, each of the light areas corresponds to one brightness parameter, the light areas can be individually regulated according to the severity degrees of the halo phenomenon in the different areas, whereby, while alleviating the halo phenomenon, the brightness regulation has a better pertinence and a better effect.