Driving Circuit Touch Sensing Integration
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Solution Overview
Problem
Display panels with touch sensing functions often have reduced sensitivity due to ambient light and panel structure interference, leading to shorter display time and limited charging and resolution in touch sensing operations.
Innovation Solution
A driving circuit integrating a touch sensing electrode, sensing circuit, and read circuit with a driving transistor, capacitor, and reset circuit, where the touch sensing electrode's electric potential is transmitted to the driving transistor's gate, allowing for simultaneous touch sensing and pixel driving, thereby enhancing sensitivity and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If independent touch sensing circuits and pixel circuits are used separately, then touch sensing function is achieved, but display time is reduced and sensitivity is lowered due to ambient light interference
Solution Approach 1:
The patent merges the touch sensing circuit and pixel circuit into a single integrated circuit. The touch sensing electrode is coupled to the gate terminal of the driving transistor, allowing the same circuit to perform both pixel driving and touch sensing functions simultaneously, thereby maintaining display time while improving touch sensing sensitivity
Solution Approach 2:
The driving transistor's gate terminal serves dual purposes: it controls the pixel driving function while also receiving touch sensing signals from the touch sensing electrode. This multi-functional design eliminates the need for separate circuits and enables simultaneous operation of display and touch sensing
2Measurement precision
If separate touch sensing and pixel driving circuits are used, then touch sensing is enabled, but additional independent touch sensing time must be divided, limiting charging rate and resolution
Solution Approach 1:
The integrated circuit allows touch sensing and pixel driving to operate continuously and simultaneously without requiring separate time slots. The touch sensing electrode continuously monitors touch input while the pixel circuit maintains display operation, eliminating time division and enabling high-resolution touch sensing with fast charging rate
Data Source
AI summary
A driving circuit includes a driving transistor, a capacitor, a reset circuit, a touch sensing electrode, a sensing circuit, and a read circuit. The capacitor is electrically coupled to a gate terminal of the driving transistor. The reset circuit is electrically coupled to the gate terminal of the driving transistor, and the reset circuit is configured to reset the voltage level of the gate terminal of the driving transistor. The sensing circuit is electrically coupled between the touch sensing electrode and the gate terminal of the driving transistor, and the sensing circuit is configured to transmit the voltage level of the touch sensing electrode to the gate terminal of the driving transistor. The read circuit is electrically coupled to the driving transistor, and the read circuit is configured to output a touch sensing signal according to the voltage level of the gate terminal of the driving transistor.