Local Dimming Timing Control for Frame-Synced LCD Backlights
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Solution Overview
Problem
The display quality is compromised due to the backlight unit and liquid crystal display panel displaying data from different frames, resulting from a significant output delay between local dimming data and image data.
Innovation Solution
A data processing method that synchronizes the output of local dimming data with image data by determining an earlier start and later end for local dimming data output based on image data synchronization signals, utilizing extracting, filtering, and caching circuits to minimize delay, and controlling backlight unit power supply during overlapping and non-overlapping periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If local dimming data is collected completely before output to prevent output delay, then data synchronization is improved, but output time is delayed beyond one frame duration causing frame mismatch
Solution Approach 1:
The patent applies preliminary action by starting to output local dimming data before the image data output is complete. Specifically, the local dimming data output starts at a first moment and continues to a second moment, while image data output starts at a second moment and ends at a third moment. This overlapping output strategy ensures that the backlight unit receives synchronized data without waiting for complete data collection, thereby preventing frame mismatch while maintaining synchronization reliability.
2Reliability
If local dimming data output starts earlier to overlap with image data output, then frame synchronization is improved, but data processing completeness may be compromised
Solution Approach 1:
The patent implements preliminary action by initiating local dimming data output before the image data output cycle completes. The local dimming data is processed and begins output at a first moment, overlapping with the image data output that occurs from the second moment to the third moment. This approach ensures frame synchronization is maintained while the data processing system has already prepared the necessary local dimming data in advance, thus not compromising processing completeness.
Data Source
AI summary
A data processing method and device, where the method includes: obtaining current-frame image data and a synchronization signal of the current-frame image data, processing the current-frame image data to obtain current-frame local dimming data, and outputting the current-frame local dimming data according to the synchronization signal of the current-frame image data, wherein an output starting moment of the current-frame local dimming data is earlier than an output termination moment of the current-frame image data, and an output termination moment of the current-frame local dimming data is later than the output termination moment of the current-frame image data, so that an output time period of the current-frame local dimming data partially overlaps with an output time period of the current-frame image data. By means of this arrangement, a liquid crystal display panel and a backlight unit display data of the same frame, thereby improving the display quality.