Backlight Unit Charging for Smooth Gray Transitions
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Solution Overview
Problem
Conventional display panels experience unsmooth transitions between different gray values due to inaccurate charging of backlight units.
Innovation Solution
A display method and device that involves obtaining illuminating data for backlight units, dividing the display time into sub-periods with varying durations, and inputting sub-illuminating data corresponding to different voltage levels during each sub-period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional display panels use standard charging methods for backlight units, then the device complexity is reduced, but the transition smoothness between different gray values deteriorates
Solution Approach 1:
The patent segments the charging process into multiple stages by dividing the display frame into multiple sub-frames (first sub-frame, second sub-frame, third sub-frame). Each sub-frame corresponds to a different charging stage with specific voltage levels and time durations, enabling precise control of backlight unit charging to achieve smooth gray value transitions.
Solution Approach 2:
The patent applies dynamic charging control by adjusting voltage levels and time durations based on the specific gray values being displayed. The control method dynamically modifies charging parameters (voltage, time) for different backlight units depending on their required gray levels, transforming a static charging approach into a dynamic adaptive process.
2Measurement precision
If the display panel uses uniform charging for all backlight units, then the ease of operation is improved, but the luminance precision deteriorates
Solution Approach 1:
The patent implements local quality control by treating different backlight units differently based on their specific requirements. Each backlight unit is assigned specific voltage levels and time durations according to its target gray value, rather than applying uniform charging to all units. This localized approach enables precise luminance control for each backlight unit.
Solution Approach 2:
The patent changes charging parameters (voltage levels, time durations) based on the luminance requirements of different backlight units. By adjusting these parameters dynamically according to the gray values being displayed, the system achieves precise luminance control while managing complexity through systematic parameter variation.
3Measurement precision
If the display panel charges backlight units quickly, then the productivity is improved, but the charging accuracy deteriorates
Solution Approach 1:
The patent segments the charging process across multiple sub-frames within a display refresh cycle. By distributing charging operations across time (first sub-frame for initial charging, second sub-frame for intermediate charging, third sub-frame for final charging), the system achieves both accuracy and efficiency without compromising either parameter.
Solution Approach 2:
The patent employs periodic charging actions within the display refresh cycle, where backlight units are charged at multiple predetermined time points (sub-frames) rather than continuously or once. This periodic charging approach allows for accurate charging completion while maintaining high display refresh rates.
Data Source
AI summary
A display method used includes: obtaining a plurality of illuminating data corresponding to the plurality of backlight units, the plurality of illuminating data are configured for the plurality of backlight units to display a frame within a predetermined time period. The predetermined time period is divided to a plurality of sub-periods. Two of the sub-periods are not equal. The illuminating data includes sub-illuminating data corresponding to the sub-periods, and the sub-illuminating data correspond to data voltages of different voltage levels. When each of the plurality of the sub-periods begins, inputting a scan signal into the scan line to allow the plurality of backlight units to receive the plurality of sub-illuminating data.