Display Device Frame Rate Adaptive Luminance Correction Circuit
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Solution Overview
Problem
Conventional display technologies fail to address display unevenness when the frame rate of a video changes, leading to correction errors and potential display issues due to the deterioration of light emitting layers in self-luminous elements.
Innovation Solution
A display device with a correction circuit that adjusts input gradation values based on an efficiency residual rate, calculating corrected luminance values and stress amounts to account for frame rate changes, ensuring uniform light emission across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional correction techniques are used to correct video signals, then display unevenness is reduced under fixed frame rates, but correction errors occur and display unevenness reappears when frame rates change
Solution Approach 1:
The correction circuit dynamically adjusts the correction amount based on the detected frame rate. Instead of using a fixed correction value, the system changes correction parameters in real-time according to the actual frame rate, enabling accurate correction across varying frame rates and preventing display unevenness.
Solution Approach 2:
The invention changes the correction parameters (such as correction amounts or lookup tables) according to different frame rates. By storing multiple sets of correction parameters corresponding to different frame rates and selecting the appropriate set based on detected frame rate, the system achieves accurate correction under various operating conditions.
2Manufacturing precision
If frame rate detection and dynamic correction are implemented, then display uniformity is maintained under varying frame rates, but device complexity increases
Solution Approach 1:
The correction circuit includes a frame rate detection mechanism that continuously monitors the actual frame rate and feeds this information back to adjust correction parameters. This feedback loop enables automatic adaptation to frame rate changes without requiring complex manual intervention or multiple separate correction systems.
Solution Approach 2:
The correction circuit is designed to handle multiple frame rates using a single unified structure. By incorporating frame rate detection and parameter selection capabilities within the existing correction architecture, the system achieves multi-frame-rate support without requiring entirely separate correction circuits for each frame rate.
Data Source
AI summary
A display device includes: luminance converter that converts an input gradation value into a target luminance value corresponding to the input gradation value; correction calculator that calculates an output gradation value from the target luminance value and calculates a corrected luminance value from the output gradation value using an efficiency residual rate; cumulative stress calculator that updates the efficiency residual rate using a cumulative stress amount obtained by converting a stress amount on the light emitting element calculated from the corrected luminance value into a first stress amount at a reference current and accumulating a second stress amount obtained by converting the converted first stress amount according to a frame rate; and stress amount converter that converts the first stress amount into the second stress amount by multiplying the first stress amount by a conversion coefficient corresponding to the frame rate obtained from the video signal.