AMOLED Pixel Circuit Sharing Touch and Display Modules
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Solution Overview
Problem
Current AMOLED display panels face challenges in manufacturing in-cell touch panels due to the limited space within the pixel unit, which complicates the concurrent production of in-cell touch and AMOLED driving circuits, leading to reduced product quality and increased manufacturing difficulties.
Innovation Solution
An AMOLED pixel circuit is designed with a light emitting module, a touching module, and a controlling module, where the light emitting module and touching module share common controlling and driving amplifier modules, allowing for time-sharing operation without an additional touch driving circuit, thereby enhancing the integration of in-cell touch and AMOLED driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional TFTs are added for touch sensing in each pixel unit, then touch sensing function is achieved, but pixel unit space is excessively occupied and manufacturing complexity increases
Solution Approach 1:
The patent makes the existing AMOLED driving circuit components (TFTs and capacitors) perform dual functions: driving the OLED display and sensing touch operations. The same TFTs that control OLED brightness also detect touch signals, and the same capacitors store both display and touch signals, eliminating the need for separate touch sensing components.
Solution Approach 2:
The patent merges the touch sensing circuit with the AMOLED driving circuit by integrating touch sensing electrodes and signal lines into the existing pixel structure. The touch sensing function is combined with the display function at the circuit level, allowing both functions to coexist in the same pixel unit without requiring additional space.
2Adaptability or versatility
If additional TFTs are added for touch sensing in each pixel unit, then touch sensing function is achieved, but manufacturing difficulty increases
Solution Approach 1:
The patent enables existing manufacturing processes to produce components that serve both AMOLED driving and touch sensing functions simultaneously. The same TFT fabrication process creates transistors that dual-purpose for display and touch, and the same capacitor fabrication creates storage elements for both signal types, allowing concurrent manufacturing without additional process steps.
3Adaptability or versatility
If additional TFTs are added for touch sensing in each pixel unit, then touch sensing function is achieved, but product quality decreases
Solution Approach 1:
The patent ensures that the dual-function components maintain high performance for both AMOLED driving and touch sensing. The TFTs are designed with electrical characteristics that satisfy both display drive requirements and touch signal detection sensitivity, while capacitors are sized to store both display grayscale information and touch capacitance changes accurately, preserving product quality.
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 amplifier module. The embodiments of the present invention are used for manufacturing the AMOLED display device.