Touch Substrate Bias Mesh for Accurate Remote Interaction
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Solution Overview
Problem
Current touch control technologies are limited to contact-type interactions, preventing remote touch interaction and limiting their application, especially in large-sized products where impedance differences in bias lines affect signal recognition accuracy.
Innovation Solution
A touch substrate with a photosensitive region containing non-visible light sensors, a mesh structure of bias lines, and a closed-loop trace to reduce impedance and improve signal uniformity, enabling accurate remote non-contact interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mesh structure of bias lines is used to provide bias voltage to non-visible light sensors, then the touch substrate can support remote non-contact interaction, but impedance differences in bias lines affect signal recognition accuracy
Solution Approach 1:
The patent changes the physical parameters of the bias lines by introducing a mesh structure with specific line widths (8-15 μm) and spacing, and by creating closed-loop traces with larger line widths (200-500 μm) in the non-photosensitive region. These parameter adjustments reduce impedance differences along the bias lines, thereby improving signal recognition accuracy while maintaining remote interaction capability
Solution Approach 2:
The bias line structure is segmented into multiple components: first bias lines extending in a first direction, second bias lines extending in a second direction (crossing the first), and closed-loop traces connecting these lines. This segmentation allows each segment to be optimized for specific functions, reducing overall impedance variation across the large-area touch substrate
2Reliability
If the line width of bias lines is increased to reduce impedance, then signal uniformity improves, but the area occupied by bias lines increases
Solution Approach 1:
The patent applies different line width specifications to different regions and functions: bias lines have line widths of 8-15 μm for normal operation, while closed-loop traces in the non-photosensitive region have larger line widths of 200-500 μm to provide low-impedance reference paths. This local differentiation optimizes signal uniformity where needed while minimizing area consumption in photosensitive regions
3Measurement precision
If photosensitive pixels are arranged in an array with specific ratio to enable millimeter-level positioning, then positioning accuracy improves, but the density of sensors increases
Solution Approach 1:
The patent creates equipotential regions through the closed-loop traces that connect multiple bias lines together in the non-photosensitive region. This equipotential structure provides stable reference voltages to multiple sensors simultaneously, enabling accurate positioning measurements without requiring each sensor to be independently optimized, thus reducing the overall system complexity
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
The solution enables accurate millimeter-level positioning and fast response in remote touch interactions, enhancing the recognition effect and flexibility of touch control systems.
Implementation Method 1
each photosensitive pixel includes one non-visible light sensor
Data Source
AI summary
A touch substrate, a display apparatus and a display system are provided. The touch substrate includes a base substrate including a photosensitive region; a plurality of photosensitive pixels in an array in the photosensitive region, each photosensitive pixel includes one non-visible light sensor, and a ratio of a side length of each photosensitive pixel to a distance between the non-visible light sensors of two adjacent photosensitive pixels is in a range from 25:24 to 12:11; and a plurality of bias lines on a side of the plurality of non-visible light sensors away from the base substrate, the plurality of bias lines include a plurality of first bias lines and a plurality of second bias lines crossing with each other, and at least one of the plurality of first bias lines and the plurality of second bias lines is electrically connected to each non-visible light sensor.