Touch Pixel Array Substrate Voltage-Shielding Lines Signal Interference
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Solution Overview
Problem
The integration of touch panels and display panels in electronic devices often results in signal interference due to electrical coupling between read-out lines and other circuits, leading to inaccurate touch event detection and performance deterioration.
Innovation Solution
The implementation of a touch pixel array substrate with read-out lines positioned between data lines and voltage-shielding lines, where the voltage-shielding lines are placed between read-out lines and data lines, preventing electromagnetic interference and ensuring reliable signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If read-out lines are configured onto the pixel array substrate to transmit touch event signals, then signal transmission capability is improved, but electrical coupling interference between read-out lines and other circuits occurs, deteriorating touch event detection accuracy
Solution Approach 1:
The patent introduces voltage-shielding lines as intermediary elements positioned between the read-out lines and data lines. These voltage-shielding lines act as mediators that block electrical coupling interference from propagating to the read-out lines, thereby protecting signal transmission reliability while maintaining the necessary circuit layout for touch event detection
Solution Approach 2:
The patent converts the potentially harmful electrical coupling effect into a beneficial shielding mechanism by utilizing the voltage-shielding lines. The interference that would normally deteriorate signal quality is transformed into a controlled electromagnetic shielding effect, where the voltage-shielding lines actively prevent harmful coupling while being part of the same circuit substrate
2Area of stationary object
If photo-sensing units are arranged in matrix form to detect touch events, then touch detection coverage is improved, but signal interference from adjacent circuits increases, reducing measurement precision
Solution Approach 1:
The voltage-shielding lines serve as intermediary protective elements positioned between the read-out lines carrying photo-sensing unit signals and the data lines. This intermediary structure prevents electrical coupling interference from compromising the precision of touch event detection while maintaining the matrix arrangement for comprehensive coverage
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 configuration enhances the signal transmission performance by reducing interference between read-out lines and data lines, thereby improving the accuracy and reliability of touch event detection in optical touch display panels.
Implementation Method 1
each of the voltage-shielding lines is located between one of the read-out lines and one of the data lines
Data Source
AI summary
A touch pixel array substrate suitable for a touch display panel includes a first substrate, scan lines, data lines, signal-control lines, read-out lines, voltage-shielding lines, active devices, pixel electrodes, and photo-sensing units. The scan lines, the data lines, the signal-control lines, the read-out lines, and the voltage-shielding lines are located on the first substrate. Each of the read-out lines is located between two adjacent data lines. Each of the voltage-shielding lines is located between one of the read-out lines and one of the data lines. Both sides of each of the read-out lines are adjacent to two voltage-shielding lines. The photo-sensing units are located on the first substrate and electrically connected to the scan lines, the signal-control lines, and the read-out lines correspondingly. A touch display panel and a touch pixel structure are also provided.