Pixel Driver Circuit for AMOLED In-Cell Touch Integration
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Solution Overview
Problem
Current AMOLED display panels face challenges in integrating both touch and display functions into a single circuit, particularly due to the inability to incorporate an in-cell touch sensor circuit into the pixel circuit, which complicates the overall circuit design and increases the number of thin film transistors (TFTs) and capacitors required.
Innovation Solution
A pixel driver circuit is designed with a driving transistor, storage capacitor, touch element connection unit, driving control unit, touch detection unit, and threshold compensation control unit, allowing for both touch sensing and display driving functions within the same circuit, reducing the number of TFTs and capacitors needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an in-cell touch sensor circuit is integrated into the AMOLED pixel circuit, then the number of TFTs and capacitors is reduced and circuit complexity is simplified, but the ability to provide both touch and display functions simultaneously is lost
Solution Approach 1:
The pixel driver circuit is designed to perform both touch sensing and display driving functions through the same circuit components. The driving transistor and storage capacitor are utilized in both touch detection mode and display driving mode, allowing a single circuit to achieve multiple functions without requiring separate dedicated circuits for each function.
Solution Approach 2:
The touch sensing circuit and display driving circuit are merged into a single integrated pixel driver circuit. The touch element connection unit, driving control unit, and threshold compensation control unit are combined with the display driving components (driving transistor, storage capacitor) to create a unified circuit structure that handles both touch and display operations.
2Quantity of substance
If touch and display functions are integrated into a single pixel driver circuit, then the number of TFTs and capacitors is reduced, but the circuit design becomes more complex
Solution Approach 1:
The integrated pixel driver circuit is divided into distinct functional modules: a touch element connection unit for connecting touch elements, a driving control unit for controlling the driving transistor, and a threshold compensation control unit for voltage compensation. This segmentation allows each module to be designed and optimized independently while maintaining overall integration.
Solution Approach 2:
The circuit operates in different operational modes (touch sensing mode and display driving mode) by dynamically controlling the switching states of transistors and the connectivity of circuit components. The control signals dynamically reconfigure the circuit topology to suit the current operational requirement, enabling flexible dual-function operation.
Data Source
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AI summary
The present disclosure provides a pixel driver circuit, a pixel driving method, a pixel circuit and a display device. The pixel driver circuit includes: a touch element connection unit connected between a touch element and a second end of a storage capacitor; a diving control unit connected between a gate electrode of a driving transistor and the second end of the storage capacitor; a first power voltage application unit connected between a second electrode of the driving transistor and a first power line; a touch detection unit connected between a touch detection line and a first electrode of the driving transistor; and a threshold compensation control unit configured to receive a reference voltage and connected to the gate electrode of the driving transistor and the second end of the storage capacitor.