OLED Pixel Circuit With Time-Division Threshold Compensation
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Solution Overview
Problem
Current OLED display panels face limitations in achieving high pixel density due to limitations in array processes and film layer structures, leading to poor display effects and lower image fidelity.
Innovation Solution
A pixel circuit with a drive sub-circuit and threshold compensation sub-circuit configured for time-division voltage transmission, allowing for reset and threshold compensation without increasing the number of transistors, thereby maintaining high pixel density and improving display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional transistors are added to achieve reset and threshold compensation functions, then the reliability of pixel circuit operation is improved, but the pixel density is reduced due to increased device complexity
Solution Approach 1:
The first power line is designed to transmit multiple voltages (second reset voltage and first power voltage) in a time-division manner, enabling it to serve both reset and threshold compensation functions. This multi-functionality eliminates the need for separate dedicated transistor components for each function, thereby maintaining high pixel density while ensuring reliable circuit operation.
Solution Approach 2:
The first power line alternates between transmitting the second reset voltage and the first power voltage in different drive phases within the same display frame. This periodic action allows the circuit to perform reset and threshold compensation operations at different time intervals, achieving reliable operation without requiring additional simultaneous transistor components.
2Manufacturing precision
If more components are added to improve display performance, then the image fidelity is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The first power line serves multiple functions by transmitting different voltages at different times, eliminating the need for separate dedicated power lines and control components. This reduces the total number of components that need to be manufactured and assembled, simplifying the manufacturing process while maintaining high display performance through effective reset and threshold compensation.
Solution Approach 2:
The reset function and threshold compensation function are merged into a single integrated circuit architecture that uses the first power line for both purposes. By combining these functions rather than implementing them as separate independent systems, the manufacturing complexity is reduced while the display performance benefits from coordinated operation of the merged functions.
Data Source
AI summary
The pixel circuit includes: a drive sub-circuit, a first terminal of the drive sub-circuit being connected to a first power line, where in each drive cycle, a voltage of a first power signal on the first power line differs in at least two drive phases; and a threshold compensation sub-circuit, the threshold compensation sub-circuit being connected between a second terminal of the drive sub-circuit and a control terminal of the drive sub-circuit, and the threshold compensation sub-circuit being configured to reset the drive sub-circuit and perform threshold compensation on the drive sub-circuit in a time-division manner, where the first power signal includes a second reset voltage and a first power voltage.