Touch Array Substrate Sequential Scanning for In-Cell Accuracy
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Solution Overview
Problem
The accuracy of touch recognition in In-cell touch screens is limited by the number of ports of the timing controller, resulting in low accuracy due to the restricted number of touch blocks that can be placed on the array substrate.
Innovation Solution
A touch array substrate design that includes a timing controller with clock output and reception/detection terminals, receiving lines, transmitting lines, and a transmitting driven unit, where the transmitting driven unit sequentially outputs signals to the transmitting lines, forming touch capacitors with receiving lines to determine touch positions, reducing the number of ports required for accurate touch recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a self-capacitance structure with multiple touch blocks is used in In-cell touch screens, then the touch recognition accuracy can be improved, but the number of ports required for the timing controller increases, leading to device complexity
Solution Approach 1:
The patent divides the touch control function into two independent parts: a timing controller that generates clock signals, and a transmitting driven unit that sequentially controls transmitting lines. This segmentation allows the timing controller to use fewer ports while maintaining high touch recognition accuracy through sequential scanning of multiple touch blocks.
Solution Approach 2:
The patent implements periodic action by sequentially activating different transmitting lines at different time periods based on clock signals. Each transmitting line is activated in turn to form touch capacitors with receiving lines, enabling multiple touch blocks to be detected over time with fewer simultaneous ports required.
2Measurement precision
If the number of touch blocks is increased to improve touch recognition accuracy, then more ports are needed for the timing controller, but the number of ports is limited, resulting in low accuracy
Solution Approach 1:
The patent makes the transmitting lines dynamic by sequentially activating them in different time periods rather than having all lines active simultaneously. This dynamic approach allows the system to handle a larger number of touch blocks than the number of ports available, as each port is reused across different time periods.
Solution Approach 2:
The patent adds the time dimension to the touch detection process. Instead of detecting all touch blocks simultaneously in space (requiring many ports), the system detects them sequentially in time, transforming a spatial problem into a temporal solution that reduces port requirements.
3Measurement precision
If more ports are provided on the timing controller to support more touch blocks, then touch recognition accuracy improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The transmitting driven unit serves multiple functions: it receives clock signals from the timing controller, generates driving signals for transmitting lines, and controls the sequential activation of touch blocks. This multi-functional design consolidates what would otherwise require multiple separate components, simplifying manufacturing.
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 design enhances touch recognition accuracy while reducing the number of ports needed, allowing for more flexible design options and higher accuracy with the same number of touch detecting points, compared to traditional methods.
Implementation Method 1
each transmitting line can be with the plurality of receiving lines to form a plurality of corresponding touch capacitors
Data Source
AI summary
Disclosed are a touch array substrate, a touch positioning method and a display panel. The touch array substrate includes: a plurality of receiving lines, a plurality of transmitting lines and a transmitting driven unit. Each receiving line is connected to the reception and detection terminal of the timing controller, each transmitting line can be with the plurality of receiving lines to form a plurality of corresponding touch capacitors; a plurality of clock input terminals of the transmitting driven unit are connected to the plurality of clock output terminals of the timing controller one-by-one; a plurality of output terminals of the transmitting driven unit are connected to input terminals of the plurality of the transmitting lines one-by-one, and the transmitting driven unit can sequentially output transmitting driven signals to the plurality of transmitting lines according to a plurality of received clock signals, to drive the transmitting lines to work sequentially.