Display Driving Device Phase Delay Control for Brightness Difference Reduction
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Solution Overview
Problem
Active matrix organic light-emitting diode (AMOLED) displays suffer from visual discomfort due to brightness differences caused by the coupling of reference voltage, resulting in noticeable bright dark lines.
Innovation Solution
A display driving method that includes delaying the phase of light-emission control signals by a predetermined duration in each delay cycle, subdividing the influence of reference voltage coupling, and using pulse width modulation signals to control light-emission control signals during each frame of display time periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light-emission control signals are applied without phase delay, then display refresh is efficient and timely, but brightness differences and visible bright dark lines occur due to reference voltage coupling
Solution Approach 1:
The patent divides the light-emission control signal application into multiple delay cycles, where each cycle applies signals with different phase delays to different pixel rows. This segmentation distributes the reference voltage coupling effect across multiple time periods, preventing the accumulation of brightness differences that would occur with simultaneous signal application, thereby reducing visible bright dark lines while maintaining acceptable refresh timing.
2Object-affected harmful factors
If light-emission control signals are delayed by multiple cycles, then brightness difference is reduced, but display response time increases
Solution Approach 1:
The patent implements periodic phase delay cycling, where the phase delay amount varies periodically across different delay cycles. This periodic action allows the display to systematically address brightness differences by cycling through different delay patterns, reducing bright dark lines through controlled temporal distribution while maintaining an overall responsive display performance by not applying maximum delay continuously.
Data Source
AI summary
A display driving method, a display driving device and a display module are provided. The display driving method includes: during each delay cycle, controlling a first light-emission control signal to be delayed by a predetermined duration from a second light-emission control signal, the predetermined duration corresponding to the delay cycle. The first light-emission control signal is a light-emission control signal outputted by each light-emission control line during an (n+1)-th frame of display time period in the delay cycle, and the second light-emission control signal is a light-emission control signal outputted by the corresponding light-emission control line during an n-th frame of display time period in the delay cycle. Each delay cycle includes N frames of display time periods, N is a positive integer greater than a first predetermined number, and n is a positive integer less than N.