LED Display Driving Method for Refresh Rate Brightness Compensation
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Solution Overview
Problem
LED displays experience brightness changes due to refresh rate variations, as the length of the programming part of the emission signal changes, affecting the pulse width modulation (PWM) part and resulting in inconsistent light emission.
Innovation Solution
A driving method that adjusts the duty ratio of the PWM part in the emission signal to compensate for brightness differences caused by refresh rate changes, ensuring consistent light emission across varying refresh rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the refresh rate of the LED display is varied, then the display can adapt to different usage scenarios (movies, documents, games), but brightness changes occur due to the length variation of the programming part
Solution Approach 1:
The patent changes the duty ratio parameter of the PWM part in response to refresh rate variations. When the refresh rate changes, the controller adjusts the duty ratio to compensate for the brightness difference caused by the programming part length change, thereby maintaining consistent perceived brightness across different refresh rates
Solution Approach 2:
The patent implements a feedback mechanism where the controller detects the refresh rate change and the resulting programming part length variation, then automatically adjusts the PWM duty ratio to compensate for the brightness difference, creating a closed-loop control system that maintains brightness consistency
2Adaptability or versatility
If the programming part length is changed in response to refresh rate variation, then the refresh rate adaptability is improved, but the PWM part length changes causing brightness inconsistency
Solution Approach 1:
The patent dynamically adjusts the duty ratio parameter of the PWM part based on the detected programming part length variation. By changing this parameter in response to refresh rate changes, the system compensates for the brightness difference and maintains precise brightness control despite the varying programming part lengths
3Illumination intensity
If the PWM part length is adjusted to compensate for programming part length change, then brightness consistency can be maintained, but the control complexity increases
Solution Approach 1:
The patent uses a feedback-based automatic adjustment mechanism where the controller detects programming part length changes and automatically calculates the required duty ratio compensation. This feedback loop maintains brightness consistency without requiring complex manual calibration or additional hardware components
Data Source
AI summary
A driving method of LED display, configured to be applied to an LED display capable of varying a refresh rate thereof and able to reduce brightness changes due to refresh rate variation, is disclosed in the present disclosure. This driving method includes: controlling an organic light-emitting diode of the LED display by an emission signal having a plurality of frame periods, with each of the frame periods having a PWM part with a duty ratio; detecting whether a change in the refresh rate of the LED display exists; and performing a compensation procedure when the change is detected, with the compensation procedure compensating a brightness difference of the organic light-emitting diode occurring due to the change in the refresh rate by adjusting the duty ratio of the PWM part. Said LED display is also disclosed.