Light Source Luminance Control for Display Flicker Reduction
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Solution Overview
Problem
Display panels experience luminance differences due to voltage leaks, leading to flicker and reduced display quality when driven by low-frequency vertical start signals, which existing technologies fail to adequately address.
Innovation Solution
A method and apparatus that store display panel luminance change data to adjust light source luminance accordingly, using dimming signals to modulate light output based on panel luminance changes, ensuring symmetric waveforms between panel and light source luminance to minimize luminance differences and prevent flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If low-frequency vertical start signals are used to drive the display panel, then power consumption is reduced and simplicity is maintained, but luminance differences increase causing flicker and deteriorating display quality
Solution Approach 1:
The patent implements a feedback mechanism where the luminance change data of the display panel is fed back to control the light source. The light source driving signal is generated based on the panel's luminance variations, creating a closed-loop system that automatically compensates for luminance differences and prevents flicker while maintaining low-frequency operation
Solution Approach 2:
The patent changes the parameter of light source luminance dynamically based on the display panel's luminance changes. By adjusting the light source output level in response to panel luminance variations, the system compensates for voltage leaks and maintains stable display quality without increasing the vertical start signal frequency
2Reliability
If voltage is applied to pixel electrodes to maintain display luminance, then display quality is improved, but voltage leakage causes luminance differences and flicker
Solution Approach 1:
The patent converts the harmful effect of voltage leakage into a beneficial control mechanism. Instead of trying to eliminate voltage leakage, the system detects the resulting luminance changes and uses this information to adjust the light source output, transforming the leakage issue into a feedback control opportunity that maintains display quality
3Reliability
If light source luminance is increased to compensate for panel luminance decrease, then display uniformity is improved, but overall luminance control precision is reduced
Solution Approach 1:
The patent dynamically changes the light source luminance parameter in response to detected panel luminance changes. By adjusting the light source output level based on real-time panel characteristics, the system maintains optimal display uniformity while preserving precise luminance control through the feedback mechanism
Data Source
AI summary
A light source apparatus includes a display panel luminance change storing part, a light source part and a light source driving part. The display panel luminance change data storing part stores a display panel luminance change data indicating a luminance change of a display panel with respect to time. The light source part provides a light to the display panel and outputs a light source luminance. The light source driving part drives the light source part based on the display panel luminance change data so that the light source luminance is decreased when a display panel luminance is increased and the light source luminance is increased when the display panel luminance is decreased. Thus, a display quality of a display apparatus may be enhanced.