Backlight Block Timing Control for LCD Motion Blur
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Solution Overview
Problem
Existing liquid crystal display panel technologies face issues with motion blur, luminance efficiency, and power consumption due to imperfect backlight control, particularly with scanning backlight drives that suffer from light leakage and uneven luminance across the screen, leading to ghost images and decreased picture quality.
Innovation Solution
A display panel control device that synchronizes the light-up and light-off timings of backlight blocks with video and black image scanning, ensuring a light-off period within each block is equal to or less than the period from the end of black image scanning to the start of video scanning on the first display line, using a correction constant to optimize luminance and motion blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If scanning backlight drive is used to improve motion blur, then motion blur is reduced, but light leakage occurs between backlight blocks causing ghost images and uneven luminance
Solution Approach 1:
The patent extracts and eliminates the problematic space parts between backlight blocks that cause light leakage. By removing these spaces or filling them with light-shielding materials, the harmful light leakage is eliminated while preserving the scanning backlight drive's motion blur reduction benefits.
Solution Approach 2:
The patent applies preliminary anti-action by pre-preventing light leakage through design modifications to the backlight block structure. By eliminating spaces between blocks before operation, the system prevents ghost images and luminance unevenness from occurring in the first place.
2Use of energy by moving object
If blinking backlight drive is used to reduce power consumption, then power consumption is reduced, but luminance efficiency deteriorates due to constant backlight lighting
Solution Approach 1:
The patent implements periodic action through scanning backlight drive, where backlight blocks are illuminated in sequential periods rather than continuously. This periodic illumination reduces power consumption while maintaining luminance efficiency by ensuring light is produced only when and where needed.
3Illumination intensity
If line sequential scanning is used for backlight control, then motion blur is improved, but luminance becomes uneven across the screen due to different frame information rewrite timings
Solution Approach 1:
The patent segments the backlight into multiple independent blocks that can be controlled separately. This segmentation allows each block to be optimized for uniform luminance output while maintaining the overall scanning sequence that reduces motion blur.
Solution Approach 2:
The patent applies local quality by ensuring each backlight block has optimized characteristics for uniform luminance distribution. By controlling each block's light output and timing locally, the system achieves both motion blur reduction and luminance uniformity across the entire screen.
Data Source
AI summary
To provide a display panel control device capable of improving gap of moving pictures, etc., without increasing the dividing number of the backlight. The device includes: a black image insertion driving part which performs, on a display panel, black image insertion drive in which video display scanning and black image display scanning are executed in a specific period; and a light-up timing control part which controls a light-up start timing and a light-off start timing of each light source block based on a synchronous signal which synchronizes with the start timing of the video display scanning or the black image display scanning. The light-off period of the light source block is equal to or less than a period from the end of black image display scanning performed on all display lines within a block area to the start of video scanning performed on the first display line within the area.