Non-Pixel Touch Capacitor Layout for Cleaner Display Sensing
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Solution Overview
Problem
Current sensors integrated into display panels, particularly touch and light sensors, cause signal crosstalk with pixel areas, leading to a low signal-to-noise ratio and increased cost.
Innovation Solution
An array substrate design with a touch unit located in the non-pixel area, comprising a touch transistor with a multiplexed gate as a touch capacitor, reducing signal crosstalk by integrating the touch transistor and read transistor processes without additional steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If sensors are integrated into the pixel area, then light sensor efficiency is improved, but signal crosstalk increases and signal-to-noise ratio decreases
Solution Approach 1:
The array substrate is divided into distinct pixel regions and non-pixel regions. Touch sensors and light sensors are specifically positioned in the non-pixel regions, separating them from the pixel areas to eliminate signal crosstalk while maintaining sensing functionality.
Solution Approach 2:
The patent utilizes the spatial dimension by extending sensor placement beyond the traditional pixel area into the non-pixel region space. This dimensional expansion allows sensors to function without interfering with pixel operations, resolving the crosstalk issue.
2Ease of manufacture
If touch transistor and read transistor are integrated, then manufacturing process is simplified, but device complexity increases
Solution Approach 1:
The touch transistor and read transistor are merged into a single integrated structure where the touch transistor's gate serves dual functions as both the touch electrode and the read transistor's control element. This merging eliminates the need for separate transistors and reduces manufacturing steps.
Solution Approach 2:
The gate of the touch transistor is designed to perform multiple functions: it acts as the control electrode for the touch transistor, the read electrode for the touch capacitor, and simultaneously serves as the gate for the read transistor. This multi-functionality reduces the total component count while maintaining all necessary functions.
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
Improves signal-to-noise ratio by eliminating the need for intermediate signal lines and simplifying the preparation process, while maintaining touch performance and reducing coupling influences with other capacitors.
Implementation Method 1
a pressure-sensitive layer disposed on the first gate
Implementation Method 2
the first gate, the pressure-sensitive layer and the first touch electrode constitute a touch capacitor
Data Source
AI summary
The application discloses an array substrate, a preparation method thereof, and a display panel. The array substrate includes a substrate and a touch unit. The substrate includes a non-pixel region. The touch unit is disposed on the substrate, and the touch unit is located in the non-pixel area. The touch unit includes a touch transistor disposed on the substrate, a pressure-sensitive layer, and a first touch electrode. The touch transistor comprises a first gate. The pressure-sensitive layer and the first touch electrode are sequentially stacked on the first gate.