Frequency-Variable Display Flicker Compensation in Vertical Blanking
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Solution Overview
Problem
Conventional display devices experience noticeable flicker and luminance deviations when rapidly changing frame frequencies due to the inability to accurately adjust data gain in real-time based on current frame information.
Innovation Solution
A frequency variable display apparatus with a flicker compensation circuit that applies compensation voltages to data and reference voltage lines during the vertical blank period to reduce luminance, thereby smoothing luminance transitions during rapid frequency changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional luminance algorithm technology determines data gain based on previous frame frequency information, then the system can operate with simpler control logic, but recognition luminance deviation occurs during rapid frame frequency changes
Solution Approach 1:
The patent applies preliminary action by determining data gain based on the frequency information of the previous frame before the current frame is displayed. This allows the system to prepare compensation values in advance during the vertical blank period of the previous frame, so that when rapid frequency changes occur, the luminance can be compensated without waiting for current frame frequency information to become available.
2Adaptability or versatility
If frame frequency is rapidly changed from low-speed to high-speed frame, then the display can adapt to varying video content requirements, but flicker phenomenon is recognized by users due to luminance deviation
Solution Approach 1:
The patent implements feedback by using the frequency information of the previous frame to determine data gain for the current frame. This feedback mechanism allows the system to anticipate and compensate for luminance deviations that occur during rapid frame frequency changes, thereby reducing flicker perception while maintaining frequency adaptability.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the data gain parameter based on the detected frame frequency and its changes. When rapid frequency transitions are detected, the system modifies the data gain parameter to compensate for luminance deviations, thereby maintaining consistent perceived luminance across different frame frequencies.
3Productivity
If data gain is adjusted without considering current frame frequency information, then the system can maintain simpler processing flow, but recognition luminance deviation occurs between frames after rapid frequency changes
Solution Approach 1:
The patent performs preliminary action by determining data gain based on previous frame frequency information before the current frame is processed. This allows the system to calculate appropriate compensation values in advance during the vertical blank period, maintaining processing efficiency while achieving luminance consistency without requiring complex real-time analysis of current frame frequency.
Data Source
AI summary
A frequency variable display apparatus can include a display panel including a plurality of subpixels, an image driving circuit configured to write, in each of the plurality of subpixels, a data voltage through a data line and a reference voltage through a reference voltage line during a vertical active period of one frame to implement active luminance, and a flicker compensation circuit configured to apply a compensation voltage to at least one of the data line and the reference voltage line in a vertical blank period of the one frame to implement blank luminance. The blank luminance is lower than the active luminance.