Dual Reset Pixel Circuit for OLED Brightness Consistency
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Solution Overview
Problem
Display panels, particularly OLEDs, face issues with brightness inconsistencies between frames, residual shadow phenomena, and insufficient charging due to inaccuracies in reset signal potentials, leading to sub-optimal display performance.
Innovation Solution
The implementation of a pixel circuit with a driving transistor and dual reset modules, where the first reset module uses alternating high and low levels to reset the gate electrode, and the second reset module resets the anode of the organic light-emitting element, allowing for more precise data signal writing and reduced voltage differences, thereby optimizing charging and reducing brightness discrepancies between frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single reset signal is used to reset the gate electrode of the driving transistor, then the circuit complexity is reduced, but the charging accuracy deteriorates and residual shadow phenomena occur
Solution Approach 1:
The reset function is segmented into two independent modules: a first reset module that resets the gate electrode of the driving transistor, and a second reset module that resets the anode of the organic light-emitting element. This segmentation allows each module to independently optimize the reset signal for its specific target, improving charging accuracy while preventing residual shadow phenomena that occur with a single shared reset signal.
Solution Approach 2:
Different reset signals with locally optimized characteristics are applied to different parts of the pixel circuit. The first reset module applies a signal optimized for the gate electrode's electrical characteristics, while the second reset module applies a signal optimized for the anode's electrical characteristics. This local quality approach ensures each component receives the most appropriate reset signal for its specific requirements.
2Device complexity
If the reset signal potential is not precisely controlled, then the circuit design is simplified, but brightness consistency between frames deteriorates
Solution Approach 1:
The dual reset module structure provides implicit feedback control by independently monitoring and resetting both the gate electrode and anode potentials. This allows the system to detect and correct potential deviations in each node separately, ensuring brightness consistency across frames without requiring complex external feedback circuits.
Solution Approach 2:
The invention changes the electrical parameters (potential levels) of reset signals applied to different nodes of the pixel circuit. By optimizing the potential characteristics of reset signals for both the gate electrode and anode separately, the system achieves precise control over charging accuracy and brightness consistency, transforming a single-parameter control approach into a multi-parameter control strategy.
3Productivity
If charging time is insufficient, then the frame rate is increased, but the charging completeness deteriorates leading to residual shadows
Solution Approach 1:
The dual reset modules perform preliminary resetting of both the gate electrode and anode before the charging phase begins. By pre-establishing the correct initial potential states in both nodes, the system reduces the actual charging time required during each frame cycle, thereby preventing residual shadow phenomena while maintaining high frame rates.
Data Source
AI summary
Provided is a display panel including n pixel sets. Each pixel set includes 2m pixel rows arranged along a first direction. n and m are positive integers. Each pixel row includes pixel circuits arranged along a second direction intersecting with the first direction. Each pixel circuit includes a driving transistor, a first reset module configured to transmit, in response to a first scan signal provided by a first scan signal line, a first reset signal provided by a first reset signal line to a gate electrode of the driving transistor, and a second reset module configured to transmit, in response to a second scan signal provided by a second scan signal line, a second reset signal provided by a second reset signal line to an anode of an organic light-emitting element. The gate electrode receives high and low levels that are configured to reset the gate electrode.