Pixel Driving Circuit Compensation for OLED Display Uniformity
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Solution Overview
Problem
Existing OLED display technologies face issues with uneven illumination due to variations in threshold voltage and power supply IR drop across different pixel positions, leading to deteriorated visual experience, especially in high PPI and large-size panels.
Innovation Solution
A pixel driving circuit with a compensation mechanism that includes a first switch circuit, a compensation circuit, a power control circuit, a driving circuit, an isolation circuit, and an energy storage circuit, which compensates for threshold voltage and power supply IR drop by using a series of transistors and a storage capacitor to ensure uniform driving current across pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional pixel driving circuits are used without compensation mechanisms, then the device complexity is low, but the display uniformity deteriorates due to threshold voltage variations and power supply IR drop across different pixel positions
Solution Approach 1:
The patent applies preliminary action by implementing a compensation mechanism that pre-corrects threshold voltage variations and power supply IR drop effects before they affect the OLED display output. The circuit performs compensation operations in advance during the charging and maintaining phases, ensuring uniform display across different pixel positions without requiring complex real-time adjustments during operation.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting voltage levels and timing sequences through multiple control signals (first control signal, second control signal, third control signal) to compensate for threshold voltage drift and IR drop. The circuit changes operational parameters such as charging voltage, maintaining voltage, and switching timing to maintain uniform display performance across different pixel positions.
2Speed
If the electroluminescent element is activated early without proper control, then the display response speed improves, but the service life of the luminescent material deteriorates
Solution Approach 1:
The patent applies preliminary action by preparing the pixel circuit in advance through a charging phase where capacitors are charged to appropriate voltage levels before the actual display operation begins. This preliminary charging ensures that when the electroluminescent element is activated, it receives the correct voltage immediately, achieving fast response without premature or excessive activation that would reduce material lifespan.
Solution Approach 2:
The patent utilizes dynamics by implementing a multi-phase control mechanism with dynamic switching between different operational states (charging phase, maintaining phase, resetting phase). The circuit dynamically adjusts voltage levels and switching timing based on the operational phase, ensuring the electroluminescent element is activated at the optimal moment for fast response while protecting the material from degradation through controlled deactivation during non-display periods.
Data Source
AI summary
The present disclosure relates to the field of display technologies, and in particular, to a pixel driving circuit, a pixel driving method, and a display panel. The pixel driving circuit includes a first switch circuit, a compensation circuit, a power control circuit, a second switch circuit, a driving circuit, an isolation circuit, and an energy storage circuit.