Backlight Source Control for Display Devices Reducing Light Leakage
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in efficiently controlling backlight sources to minimize light leakage and maintain image quality, particularly in display modes like wide-screen film display where certain regions are predominantly black or contain subtitles, leading to uneven brightness and potential light diffusion issues.
Innovation Solution
A method for dynamically adjusting the brightness of adjacent backlight subregions by determining specific backlight source weight values based on the gray-scale values of pixels, allowing for the reduction of light leakage while maintaining image quality. This involves determining the brightness of one subregion based on the adjacent subregion's brightness and using a mapping relation to set appropriate weight values for each backlight source, thereby minimizing the impact on the displayed image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the backlight source is turned off in certain display subregions to save energy and reduce light leakage, then energy consumption is reduced and light leakage is minimized, but light diffusion from adjacent subregions causes uneven brightness and affects image quality
Solution Approach 1:
The patent applies local quality by adjusting the brightness of adjacent backlight subregions dynamically. When a backlight source is turned off in a display subregion, the adjacent subregions' backlight sources have their brightness adjusted (typically reduced) to compensate for light diffusion effects. This creates non-uniform local brightness control that matches the actual light distribution pattern, thereby maintaining overall brightness uniformity while enabling energy savings from turned-off backlight sources.
2Manufacturing precision
If the brightness of adjacent backlight subregions is adjusted to compensate for light diffusion, then brightness uniformity is improved, but the complexity of the control system increases
Solution Approach 1:
The patent segments the backlight system into multiple independently controllable backlight subregions, each with its own brightness control. This segmentation allows the system to apply different brightness levels to different subregions based on local requirements, enabling precise compensation for light diffusion effects without requiring complex global control mechanisms. Each subregion can be controlled independently, simplifying the overall control architecture.
Solution Approach 2:
The patent implements preliminary action by pre-establishing the mapping relationship between display subregions and backlight subregions, and pre-calculating the brightness adjustment values for adjacent subregions based on expected light diffusion patterns. This allows the control system to anticipate and compensate for light diffusion effects before they manifest as brightness non-uniformity, simplifying real-time control requirements.
3Manufacturing precision
If weighted backlight source brightness values are used to minimize light leakage impact, then image quality is maintained, but the calculation and control complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing weight values that modify the brightness parameters of adjacent backlight subregions. These weight values are calculated based on the light diffusion characteristics and the specific configuration of the display and backlight systems. By changing the brightness parameters of adjacent subregions according to pre-calculated weights, the system compensates for light leakage effects while using relatively simple computational operations that can be efficiently implemented in real-time control.
Data Source
AI summary
One or more embodiments of the present application disclose a backlight source control method of a display device, the display device and a storage medium. The method includes: determining a display subregion corresponding to a backlight source to be turned off; determining a first backlight source brightness value of an adjacent display subregion of the display subregion corresponding to the backlight source to be turned off; lowering the first backlight source brightness value to obtain a second backlight source brightness value; and setting the backlight source brightness value corresponding to the adjacent display subregion to be the second backlight source brightness value.