OLED Pixel Circuit Reset Signal Timing for Leakage Control
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Solution Overview
Problem
OLED display panels face a higher risk of transverse leakage of electricity as resolution increases, leading to reduced display effect, especially at low grayscale or low brightness.
Innovation Solution
A display panel with a pixel circuit that includes an enable signal terminal and a reset signal terminal, where the enable signal is a pulse width modulation signal with active and inactive levels, and the reset signal has active and inactive levels that correspond to the inactive levels of the enable signal, effectively resetting the light-emitting element during inactive periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of OLED display panel is increased, then the display quality is improved, but the risk of transverse leakage of electricity increases
Solution Approach 1:
The patent applies preliminary action by resetting the light-emitting element during the inactive period before the next active period begins. The reset signal is output in advance during the inactive period to clear accumulated charges before they can cause transverse leakage, preventing the problem before it occurs in the high-resolution display structure
Solution Approach 2:
The patent implements periodic action by alternating between active periods (for light emission) and inactive periods (for resetting) in a cyclic manner. This periodic switching allows the display to maintain high resolution while periodically clearing charges to prevent transverse leakage, resolving the contradiction between display quality and electrical reliability
2Measurement precision
If the resolution of OLED display panel is increased, then the display quality is improved, but the display effect at low grayscale or low brightness deteriorates
Solution Approach 1:
The reset operation is performed in advance during the inactive period before the active period begins. This preliminary resetting ensures that when low grayscale or low brightness is displayed in the subsequent active period, there are no residual charges from previous frames to interfere, thereby maintaining good display effect at low luminance levels while preserving high resolution
Solution Approach 2:
The periodic alternation between active and inactive periods enables the display to maintain high resolution while periodically clearing charges that would otherwise accumulate and degrade low grayscale display performance. This periodic resetting ensures consistent display quality across all brightness levels
Data Source
AI summary
A display panel, a method for driving the display panel and a display apparatus are provided. The display panel includes a light-emitting element and a pixel circuit, the pixel circuit includes: an enable signal terminal being a pulse width modulation signal, including a plurality of first active levels spaced in one frame light-emitting duration, a first inactive level being between two adjacent first active levels, where the enable signal is capable of driving the light-emitting element to emit light during a first active level period; a reset signal terminal including at least one second active level and one second inactive level in one frame light-emitting duration, the second active level being in a first inactive level period, and the first active level being in a second inactive level period, where the reset signal is capable of resetting the light-emitting device during a second active level period.