OLED Display Driving Method Synchronizing Pulse-Off Durations with Brightness
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Solution Overview
Problem
Conventional OLED display panel driving methods cause flicker issues due to mismatched frequencies between scan signals and light emitting signals, leading to poor image display quality, especially with variations in light emitting brightness.
Innovation Solution
A display driving method where the pulse-off durations of pulse signals in the light emitting signal are adjusted to match the variation trend of light emitting brightness, either decreasing with decreasing brightness or increasing with increasing brightness, ensuring consistent pulse-off duration trends during the light emitting period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional OLED display panel driving methods are used with fixed pulse signals, then the device complexity is low and ease of manufacture is high, but flicker occurs and image display quality deteriorates
Solution Approach 1:
The light emitting signal is transformed from a fixed pulse pattern to a dynamic one where pulse-off durations vary according to a predetermined variation pattern. This dynamic adjustment synchronizes the light emitting signal with the scan signal frequency, eliminating flicker while maintaining manageable device complexity through algorithmic control rather than hardware complexity
Solution Approach 2:
The pulse-off duration parameter of the light emitting signal is changed dynamically during the light emitting period according to a predetermined variation pattern. This parameter change approach allows the system to adapt to different brightness levels and scan frequencies, improving image display quality without requiring complete redesign of the driving circuit
2Reliability
If pulse-off durations are adjusted to match brightness variations, then flicker is reduced and image display quality improves, but the control mechanism becomes more complex
Solution Approach 1:
The light emitting signal is structured as a periodic signal with multiple pulse signals during the light emitting period. The pulse-off durations follow a predetermined periodic variation pattern that synchronizes with the scan signal, creating a periodic control mechanism that reduces flicker while maintaining systematic simplicity
Solution Approach 2:
The control mechanism uses a predetermined variation pattern that implicitly provides feedback between the scan signal frequency and the light emitting signal characteristics. This feedback approach allows automatic flicker reduction without requiring complex real-time sensing and adjustment circuits
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
This approach effectively reduces flicker in OLED display panels, thereby enhancing image display quality by synchronizing pulse signal durations with light emitting element brightness variations.
Implementation Method 1
The light emitting element is configured to emit light based on a driving current
Data Source
AI summary
A display panel, a display driving method and a display pixel driving circuit therefor are provided. In the display driving method, the light emitting signal includes multiple pulse signals, and the variation trend of the pulse-off durations of the pulse signals is consistent with the variation trend of the light emitting brightness of the light emitting element during the light emitting period, that is, the pulse-off durations decreases sequentially with the decrease of the light emitting brightness of the light emitting element, or sequentially increases with the increase of the light emitting brightness of the light emitting element. Therefore, the flicker problem in the display panel when emitting light can be solved, and improving the image display quality.