Display Panel Luminance Compensation During PWM Mode Switching
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Solution Overview
Problem
Visible flicker phenomena occur during the display of display panels, particularly when switching between different display modes, such as normal and local high-brightness modes, due to abrupt changes in the duty cycle of PWM signals, leading to poor user experience and reduced display effectiveness.
Innovation Solution
A luminance compensation method that involves obtaining a first luminance compensation value to adjust the luminance of the first i frames and a second luminance compensation value to adjust the luminance of subsequent frames, using a luminance adjustment mode that includes pulse width modulation and voltage modulation, to stabilize luminance and reduce flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance adjustment mode switches between normal and local high-brightness modes, then the display brightness is improved, but visible flicker occurs due to abrupt PWM duty cycle changes
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing luminance compensation values for different display modes before switching occurs. When a mode transition is detected, the system immediately applies the pre-computed compensation value to the PWM duty cycle, preventing abrupt changes that cause flicker. This advance preparation eliminates the harmful transition effect while maintaining the desired brightness improvement.
2Object-affected harmful factors
If multiple luminance compensation values are stored for different display modes, then flicker is reduced, but the memory requirements and device complexity increase
Solution Approach 1:
The patent applies local quality by storing luminance compensation values specifically targeted at the transition points between display modes, rather than storing comprehensive compensation data for all possible display conditions. The compensation values are localized to the specific mode transitions that cause flicker (normal to local high-brightness and vice versa), reducing memory requirements while effectively addressing the flicker problem at these critical transition points.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively alleviates flicker and improves display quality by stabilizing luminance, reducing the performance requirements on the drive chip and lowering costs by minimizing the need for additional luminance compensation values.
Implementation Method 1
A luminance adjustment mode of the display panel includes a pulse width modulation mode
Data Source
AI summary
The present disclosure discloses a luminance compensation method and apparatus for a display panel, and a display apparatus. The method includes: obtaining a first luminance compensation value based on an instruction to change the luminance adjustment mode; compensating luminances of the first i frames of display images in a current luminance adjustment mode to a target luminance based on the first luminance compensation value, where i is an integer greater than or equal to 1; obtaining a second luminance compensation value when the first i frames in the current luminance adjustment mode end; and compensating luminances of (i+1)th to (i+n)th frames of display images in the current luminance adjustment mode to the target luminance based on the second luminance compensation value, where n is an integer greater than 1, and the (i+n)th frame of display image is the last frame of display image in the current luminance adjustment mode.