Display Panel Ineffective Pulse Duration for Flicker Reduction
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Solution Overview
Problem
Existing display panels with electroluminescent elements experience unnatural brightness-level changes and noticeable flicker when switching between high and low refresh rates, leading to poor user experience.
Innovation Solution
A display panel design that includes a pixel circuit with a drive module and a light emission control module, featuring a display period with two stages: the first stage has an ineffective pulse duration of T1, and the second stage has an ineffective pulse duration of T2, where T1 > T2, to control the drive current and maintain brightness levels during refresh frequency switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the refresh rate is switched from high frequency to low frequency, then power consumption is reduced, but brightness-level change occurs resulting in obvious flicker
Solution Approach 1:
The light emission control module dynamically adjusts the ineffective pulse duration based on the current display stage. In the first display stage, it uses a longer ineffective pulse duration (T1) to suppress brightness increase, while in the second display stage, it uses a shorter ineffective pulse duration (T2) to prevent brightness decrease, thereby adapting to different temporal requirements within the same refresh cycle.
Solution Approach 2:
The patent changes the parameter of ineffective pulse duration from a fixed value to a variable value that differs between display stages. By setting T1 > T2, the system modifies the light emission control signal characteristics to compensate for brightness variations caused by refresh rate switching, maintaining stable perceived brightness while enabling power consumption reduction at lower refresh rates.
2Adaptability or versatility
If the refresh rate is updated according to changing refresh rate, then driving flexibility is improved, but unnatural brightness-level change is perceived by user
Solution Approach 1:
The light emission control module implements dynamic control by differentiating between first and second display stages within each refresh cycle. It applies distinct ineffective pulse durations (T1 for first stage, T2 for second stage) to compensate for the non-uniform brightness distribution caused by flexible refresh rate updates, ensuring natural visual perception across varying refresh rates.
Solution Approach 2:
The patent applies preliminary anti-action by introducing ineffective pulses that preemptively counteract brightness variations before they become perceptible. The longer ineffective pulse (T1) in the first stage prevents excessive brightness accumulation, while the shorter ineffective pulse (T2) in the second stage prevents brightness drop, thereby maintaining uniform perceived brightness during refresh rate transitions.
Data Source
AI summary
Provided display panel includes at least one pixel circuit and at least one light-emitting element. The at least one pixel circuit is configured to drive the at least one light-emitting element to emit light. The at least one pixel circuit includes a drive module and a light emission control module. The drive module is configured to generate a drive current. The light emission control module is configured to control the drive current to be transmitted to a light-emitting element in response to a light emission control signal. A display period of the display panel includes a first display stage and a second display stage, where in the first display stage, an ineffective pulse duration for the light emission control signal is T1, in the second display stage, an ineffective pulse duration for the light emission control signal is T2, and T1>T2.