Frequency-Variable Display Flicker Compensation Circuit for Frame Changes
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Solution Overview
Problem
Frequency variable display apparatuses experience flicker phenomena due to rapid changes in frame frequency, leading to recognition luminance deviations that conventional luminance algorithms cannot effectively address since they rely on previous frame frequency information.
Innovation Solution
A frequency variable display apparatus with a flicker compensation circuit that causes a leakage current from subpixels to signal lines during the vertical blank period, adjusting the gate-off control voltage based on the length of the vertical front porch to reduce luminance and compensate for flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional luminance algorithm technology is used to adjust data gain based on previous frame frequency information, then the device can operate with variable refresh rate, but recognition luminance deviation occurs during rapid frame frequency changes
Solution Approach 1:
The patent applies preliminary action by performing flicker compensation in the vertical blank period before the next frame is displayed. The compensation circuit proactively adjusts the storage node voltage to pre-compensate for the luminance deviation that will occur when the frame frequency changes, rather than reacting after the deviation occurs. This allows the system to maintain luminance consistency during rapid frame frequency transitions.
2Adaptability or versatility
If frame frequency is rapidly changed to adapt to different video sources, then the display can follow varying content requirements, but flicker phenomenon is recognized by users
Solution Approach 1:
The patent implements feedback by using the vertical blank period to detect and compensate for the effects of frame frequency changes. The compensation circuit monitors the storage node voltage and adjusts it based on the known frame frequency transition, creating a closed-loop system that actively counteracts flicker before it becomes visible to users. This feedback mechanism allows rapid frame frequency changes while maintaining visual stability.
Data Source
AI summary
A frequency variable display apparatus includes a display panel where a plurality of subpixels are provided, an image driving circuit configured to write an input image in the plurality of subpixels in a vertical active period, where a data enable signal swings, of one frame to implement target luminance in the plurality of subpixels, and a flicker compensation circuit configured to cause a leakage current flowing from the plurality of subpixels to signal lines corresponding thereto in a vertical blank period, where the data enable signal does not swing, of the one frame to implement flicker compensation luminance which is lower than the target luminance in the plurality of subpixels.