AMOLED Pixel Circuit Sharing Transistors for In-Cell Touch
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Solution Overview
Problem
Current AMOLED display panels face challenges in manufacturing in-cell touch panels and driving circuits concurrently due to limited space and increased complexity, leading to reduced product quality and manufacturing difficulties.
Innovation Solution
An AMOLED pixel circuit is designed with a light emitting module, touching module, controlling module, and driving and amplifying module, where the controlling and driving modules are shared to enable time-sharing operation of touch and display signals, eliminating the need for an additional touch driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional TFTs are added to the pixel unit for touch sensing, then touch sensing function is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent makes the existing TFTs in the AMOLED pixel circuit perform dual functions: display driving and touch sensing. The first TFT serves as both a switching transistor for OLED control and a sensing transistor for touch detection, while the second TFT acts as both a compensation transistor for display and a sensing transistor for touch. This multi-functionality eliminates the need for additional dedicated touch TFTs, resolving the contradiction between touch function and device complexity
Solution Approach 2:
The patent combines the touch sensing circuit functions with the existing display driving circuit by sharing common components. The sensing module utilizes the same TFTs, signal lines, and control structures already present in the display circuit, merging two separate functions into a unified circuit architecture. This integration reduces overall device complexity while maintaining both display and touch capabilities
2Adaptability or versatility
If additional TFTs are added to the pixel unit for touch sensing, then touch sensing function is improved, but manufacturing precision and product quality decrease
Solution Approach 1:
By making existing TFTs serve dual purposes for both display and touch functions, the patent avoids the need to manufacture additional TFTs in each pixel unit. This reduces the total number of manufacturing steps and alignment requirements, thereby maintaining high manufacturing precision and product quality while still achieving touch sensing functionality
3Adaptability or versatility
If additional TFTs are added to the pixel unit for touch sensing, then touch sensing function is improved, but the free space in pixel unit is reduced
Solution Approach 1:
The patent achieves touch sensing functionality by repurposing existing TFTs rather than adding new ones, thereby utilizing already-allocated space in the pixel unit. The first and second TFTs are configured to perform both display driving and touch sensing operations, eliminating the need for additional space-consuming touch-specific transistors and preserving free space in the pixel unit
Data Source
AI summary
The present invention provides an AMOLED pixel circuit, a driving method thereof and a display device which can improve the integration degree of the in cell touch circuit and the AMOLED driving circuit. The AMOLED pixel circuit comprises: a light emitting module, a touching module, a controlling module and a driving and amplifying module. The embodiments of the present invention are used for manufacturing the AMOLED display device.