Micro-LED Display Flicker Reduction via Variable Emission Duty Ratio
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Solution Overview
Problem
Display apparatuses with micro-LEDs suffer from flicker issues due to luminance deviations caused by varying frame frequencies, which affect power consumption and image quality.
Innovation Solution
A display apparatus and method that control the duty ratio of an emission control signal in both active and blank periods of a frame, allowing for different duty ratios during these periods to minimize luminance deviations and reduce flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If micro-LEDs are driven with high current to improve light efficiency, then luminance output is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by implementing emission duty driving where micro-LEDs are driven in periodic emission periods rather than continuously. The emission control signal activates pixels only during specific time windows within each frame, creating a periodic on-off pattern that reduces average power consumption while maintaining required luminance levels through controlled emission bursts
2Use of energy by moving object
If emission duty driving is used to reduce power consumption, then power consumption is decreased, but luminance deviation occurs causing flicker
Solution Approach 1:
The patent applies local quality by differentiating the duty ratio of the emission control signal between different time periods within a frame. Specifically, the duty ratio during the active period is set differently from the duty ratio during the blank period, allowing optimized power consumption during active display while maintaining luminance stability during transitions, thereby reducing flicker caused by uniform duty cycling
3Use of energy by moving object
If frame frequency is varied to adjust emission time, then power consumption is optimized, but luminance deviation increases causing flicker
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the duty ratio parameter of the emission control signal based on the frame frequency and timing characteristics. When frame frequency varies to optimize power consumption, the duty ratio is simultaneously modified to compensate for luminance deviations, ensuring that the product of frame frequency and duty ratio maintains consistent average luminance output across different operating conditions
Data Source
AI summary
A display apparatus comprises: a display panel including pixels that emit light, wherein an amount of emitted light is controlled based on a data voltage, and an emission time of the pixels is controlled based on a duty ratio of an emission control signal applied to the pixels; a timing controller configured to control the emission control signal in an active period of one frame and in a blank period of the one frame, where the data voltage is supplied to the pixels during the active period of the one frame and the data voltage is maintained during the blank period of the one frame; and a gate driver configured to apply to the pixels the emission control signal having a first duty ratio during the active period and the emission control signal having a second duty ratio that is different from the first duty ratio during the blank period.