Dimming Processing Device for Backlight Flicker Reduction
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Solution Overview
Problem
Current dimming technologies for backlights in electronic devices face challenges in reducing power consumption without affecting the user environment, leading to issues like artifacts, flicker, and inaccurate brightness control due to high differences in backlight brightness over time.
Innovation Solution
A dimming processing technique that adjusts the dimming value of a backlight using a mixed function with different characteristics in two intervals, allowing for rapid change in the initial interval and slow change in the latter interval, ensuring accurate and natural brightness adjustment without flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local dimming is applied to reduce power consumption, then power consumption decreases, but brightness uniformity deteriorates causing artifacts
Solution Approach 1:
A brightness filtering circuit is introduced as an intermediary component between the local dimming control and the backlight units. This filter processes the dimming values and applies smoothing algorithms to reduce abrupt brightness changes between adjacent regions, thereby eliminating artifacts while preserving the power-saving benefits of local dimming
2Stability of the object's composition
If brightness filtering is applied to remove artifacts, then brightness uniformity improves, but power consumption increases
Solution Approach 1:
The filtering operation is applied selectively and partially - only to specific regions where artifacts are detected or where brightness transitions exceed a threshold. The filtering intensity and scope are adjusted dynamically to achieve sufficient artifact reduction while minimizing the additional power consumption that would result from applying full-strength filtering across the entire display
3Object-generated harmful factors
If IIR filter is used for brightness filtering, then artifact removal improves, but target brightness accuracy deteriorates
Solution Approach 1:
Instead of directly modifying the original dimming values with the IIR filter, the patent creates a filtered copy of the brightness data for artifact removal purposes. The original unfiltered dimming values are preserved and used to drive the backlight, ensuring that the target brightness accuracy is maintained while the filtered copy is used solely for detecting and mitigating artifacts
4Speed
If dimming value changes rapidly between frames, then responsiveness improves, but visual naturalness deteriorates causing flicker
Solution Approach 1:
The patent implements dynamic dimming value adjustment that adapts to different display conditions and content types. The system automatically adjusts the dimming transition characteristics - using faster transitions for static or uniform content and slower, smoother transitions for content with complex brightness variations. This dynamic adaptation maintains both responsiveness and visual naturalness across different scenarios
Data Source
AI summary
An embodiment enables natural and smooth change in the brightness of a backlight unit and is able to reduce flicker by changing a dimming value between frames through a mixed function including a plurality of functions having different characteristics.