10T2C AMOLED Pixel Circuit for Reduced Pitch and Compensation
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Solution Overview
Problem
Existing high-end active matrix organic light emitting diode (AMOLED) products face instability in current due to threshold voltage drift of thin film transistors (TFTs) in low temperature poly-silicon (LTPS) processes, leading to decreased display quality and challenges in miniaturizing pixel circuits with six transistors and one capacitor, which limits pixel density and display performance.
Innovation Solution
A 10T2C AMOLED pixel circuit is introduced, comprising two pixel sub-circuits, an initialization module, and a data voltage writing module, which reduces the size of the pixel circuit, allowing for a lower pixel pitch and increased pixel density by sharing data and gate control signal lines between pixels, and performing threshold voltage compensation to improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 6T1C pixel circuit is used, then threshold voltage compensation can be achieved, but the pixel pitch cannot be decreased further and the circuit becomes complex
Solution Approach 1:
The patent merges the compensation circuit with the data voltage writing function into a unified 10T2C pixel circuit structure. The compensation capacitor and data voltage writing capacitor share spatial resources, and the compensation transistor and data voltage writing transistor share functional resources through time-division multiplexing, thereby reducing overall circuit complexity while maintaining compensation capability
Solution Approach 2:
The patent implements multi-functionality by enabling the same transistor and capacitor components to serve dual purposes: the compensation transistor also functions as a data voltage writing transistor, and the compensation capacitor also serves as a data voltage storage capacitor. This universal design reduces the total component count and simplifies the pixel circuit architecture
2Reliability
If six thin film transistors and one capacitor are disposed in one pixel, then compensation can be achieved, but the pixel pitch cannot be decreased and manufacturing becomes difficult
Solution Approach 1:
The patent combines multiple functions into fewer components: the data voltage writing module and compensation module share transistors and capacitors through time-division multiplexing. This merging reduces the number of separate manufacturing steps and simplifies the fabrication process while maintaining the compensation function
Solution Approach 2:
The patent performs preliminary initialization of the pixel circuit using an initialization module that sets up the compensation capacitor and data voltage writing capacitor before the main operation sequence. This preliminary action ensures proper circuit state and simplifies subsequent manufacturing and operation
3Area of moving object
If pixel circuit size is reduced, then pixel pitch decreases and pixel density increases, but circuit design becomes more challenging
Solution Approach 1:
The patent resolves the space-constraint problem by transitioning from a static spatial arrangement to a time-division multiplexed architecture. Operations that would traditionally require separate spatial components are instead executed sequentially in time, allowing the same physical components to serve multiple functions and enabling smaller pixel pitch
Solution Approach 2:
The patent merges the data voltage writing function and compensation function into a unified circuit design where the same transistors and capacitors are reused for both purposes through time-division multiplexing. This merging dramatically reduces the number of components needed and simplifies the overall circuit design while achieving smaller pixel pitch
Data Source
AI summary
A pixel circuit and a display are configured to reduce a size of the pixel circuit, so as to further reduce pixel pitch, increase the number of the pixels contained in per unit area and improve picture display quality. The pixel circuit includes: a first pixel sub-circuit and a second pixel sub-circuit, as well as an initialization module (31) and a data voltage writing module (32) connected to the first pixel sub-circuit and the second pixel sub-circuit; wherein the initialization module (31) is connected to a reset signal terminal and a low potential terminal, and is configured to initialize the first pixel sub-circuit and the second pixel sub-circuit under the control of a reset signal inputted from the reset signal terminal; the data voltage writing module (32) is connected to a data voltage terminal and a gate signal terminal, and is configured, under the control of a signal inputted from the gate signal terminal, to firstly write a first data voltage to the first pixel sub-circuit and the second pixel sub-circuit and perform compensation on a driving module (332) of the second pixel sub-circuit, and then to write a second data voltage to the first pixel sub-circuit and perform compensation on a driving module (331) of the first pixel sub-circuit.