Full-in-cell Touch Screen Transistor Matrix for Charge Release
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Solution Overview
Problem
Full-in-cell touch screen panels face issues with liquid crystal polarization during long standby modes, leading to abnormal displays due to continuous touch scanning and electric charge coupling with the source electrode of thin-film transistors.
Innovation Solution
The integration of a plurality of transistors in the full-in-cell touch screen panel, where the source electrode of each transistor is connected to sensor pads, allowing for time division operation between touch scanning and display modes, ensuring electric charge is released and preventing liquid crystal polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous touch scanning is performed in standby mode, then touch detection function is maintained, but liquid crystal polarization occurs causing abnormal display
Solution Approach 1:
The patent implements periodic touch scanning instead of continuous scanning by controlling transistors to alternately connect sensor pads to data lines during specific time periods. This periodic connection maintains touch detection capability while preventing continuous electric charge coupling that causes liquid crystal polarization, thereby resolving the contradiction between maintaining touch function and preventing display abnormality.
2Device complexity
If touch sensor shares common electrode (Vcom) with display, then integration is achieved, but electric charge couples to source electrode causing polarization
Solution Approach 1:
The patent dynamically controls the connection between sensor pads and data lines through transistor gating. During display periods, sensor pads function as common electrode for display; during touch scanning periods, they are dynamically connected to data lines for touch detection. This dynamic switching prevents continuous charge coupling while maintaining the integrated full-in-cell structure, resolving the contradiction between integration and charge coupling prevention.
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
This solution effectively prevents liquid crystal polarization and abnormal displays by releasing electric charge during touch scanning periods, maintaining panel integrity and reducing power consumption.
Implementation Method 1
a plurality of transistors are formed on the data lines, wherein a drain electrode of each transistor is connected to the corresponding data line, so as to release electric charge coupled to the liquid crystal in the touch scanning period
Data Source
AI summary
The invention disclosure a full-in-cell touch screen panel and a mobile device including a plurality of the sensor pads arranged in a matrix, a plurality of data lines arranged along the row direction of the matrix, a data driving device connected to the data lines and a plurality of transistors formed on the data line, wherein each transistor of the plurality of the transistors is formed in each of the data line, the drain electrode of each transistor is connected to the corresponding data line, the gate electrodes of all of the plurality of the transistors are all connected to the specific enable terminal of the data driving device. According to the full-in-cell touch screen panel and its display apparatus, the electric charge coupled to the liquid crystal in the touch scanning period can be released.