10T2C AMOLED Pixel Circuit Sharing Components to Reduce Pitch
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Solution Overview
Problem
Current AMOLED pixel circuits require a large number of Thin Film Transistors (TFTs) and capacitors, leading to unstable current drive for Organic Light Emitting Diodes (OLEDs) and limiting display quality due to the high performance requirements and inability to reduce pixel pitch.
Innovation Solution
A 10T2C AMOLED pixel circuit is designed, comprising two pixel sub-circuits and modules for initialization and data voltage writing, which reduces the overall size and pitch, allowing for increased pixel density and improved display quality by sharing signal lines between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the 6T1C pixel compensation circuit is used, then the threshold voltage drift can be compensated, but the pixel circuit size becomes large and pixel pitch cannot be further reduced
Solution Approach 1:
The patent merges two pixel circuits into a shared structure where common components (such as capacitors and signal lines) are shared between adjacent pixels. This reduces the total component count per pixel while maintaining the compensation function, directly addressing the contradiction between reliability and area.
Solution Approach 2:
The patent designs universal components that serve multiple functions: capacitors serve both as storage elements and as part of the compensation mechanism, while signal lines carry multiple signals sequentially. This multi-functionality reduces the number of dedicated components needed, shrinking pixel area while preserving threshold voltage compensation capability.
2Reliability
If 6 TFTs and one capacitor are arranged in one pixel, then threshold voltage compensation can be achieved, but the TFT device size must be very small and performance requirements become too high
Solution Approach 1:
Adjacent pixels share common capacitors and control lines, reducing the number of TFTs needed per pixel. This merging approach lowers the performance burden on individual TFT devices while maintaining the overall compensation function across the pixel array.
Solution Approach 2:
The patent segments the compensation function into temporal phases rather than requiring all components to be present simultaneously in each pixel. By using sequential writing and shared resources, the system achieves compensation with fewer and less demanding TFT devices.
3Reliability
If 12 TFTs and 2 capacitors are arranged in two pixels, then each pixel can be fully compensated, but the horizontal pixel arrangement becomes cumbersome and pixel density is limited
Solution Approach 1:
The patent merges two pixel circuits into a shared structure where common components (such as capacitors and signal lines) are shared between adjacent pixels. This reduces the total component count per pixel while maintaining the compensation function, directly addressing the contradiction between reliability and area.
Solution Approach 2:
The patent designs universal components that serve multiple functions: capacitors serve both as storage elements and as part of the compensation mechanism, while signal lines carry multiple signals sequentially. This multi-functionality reduces the number of dedicated components needed, shrinking pixel area while preserving threshold voltage compensation capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The 10T2C AMOLED pixel circuit effectively reduces pixel pitch, increases pixel density, and enhances display quality by implementing a more compact design that compensates for threshold voltages and supports efficient light emission.
Implementation Method 1
the fluctuation of the LTPS process would cause drifts of threshold voltages of Thin Film Transistor (TFT) devices, such as to cause currents for driving the Organic Light Emitting Diode (OLED) devices unstable
Data Source
AI summary
A pixel circuit and a display are configured to reduce the size of the pixel circuit, and in turn reduce the pixel pitch and increase the pixel number per unit area, and thus improve the display quality of pictures. The pixel circuit comprises a first pixel sub-circuit and a second pixel sub-circuit, and 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 level terminal, and is configured to initialize the first pixel sub-circuit and the second pixel sub-circuit under the control of a reset signal input at the reset signal terminal; and 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 input at the gate signal terminal, to firstly write a first data voltage to the first pixel sub-circuit and perform compensation for a driving module (331) of the first pixel sub-circuit, and then write a second data voltage to the second pixel sub-circuit and perform compensation for a driving module (332) of the second pixel sub-circuit.