Backlight Drive Controller Local Dimming Response Speed
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Solution Overview
Problem
Liquid crystal display devices with local dimming control struggle to respond quickly to rapid changes in images, such as during scroll or zoom operations, due to the need to compute separate signals for the liquid crystal panel and backlight for each frame, leading to image quality degradation.
Innovation Solution
Implementing a special area control mode where a common luminance pattern is determined for multiple frames, allowing the backlight drive controller to compute and apply a luminance pattern based on average or maximum pixel luminances, reducing the need for frame-by-frame computation and improving response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If separate signals for liquid crystal panel and backlight are computed for each frame to achieve local dimming control, then image contrast is improved, but response speed deteriorates due to rapid computation requirements
Solution Approach 1:
The patent applies preliminary action by computing the luminance pattern in advance for multiple frames rather than computing separate signals for each frame. The backlight drive controller determines a common luminance pattern that covers a plurality of frames, allowing the system to prepare control signals ahead of time and thus improve response speed during rapid image changes while maintaining local dimming control for image contrast.
2Manufacturing precision
If frame-by-frame computation is performed for local dimming control, then image quality is maintained, but processing time increases leading to degradation during rapid operations
Solution Approach 1:
The patent applies merging by combining the computation for multiple frames into a single common luminance pattern. Instead of processing each frame separately, the backlight drive controller merges the computation across multiple frames to determine one luminance pattern that serves all of them, thereby reducing processing time while maintaining adequate image quality for local dimming control during rapid operations.
Data Source
AI summary
A liquid crystal display device comprising a liquid crystal panel, a backlight, a liquid crystal panel drive controller, and a backlight drive controller determining a luminance pattern defining a magnitude of luminance of each of the plurality of illumination parts on the basis of luminance information corresponding to each area to perform an area control for separately controlling the luminances of the plurality of illumination parts in accordance with the luminance pattern, the backlight drive controller having a special area control mode for performing the area control by determining the luminance pattern common to a plurality of frames of the image displayed on the display region, wherein the backlight drive controller, in the special area control mode, performs computation of an average value of the luminances of respective pixels of the image on the basis of the image signal for the plurality of frames to determine the luminance pattern.