Single-Layered Touch Sensor Structure for Display Devices
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Solution Overview
Problem
Touch display devices face challenges in manufacturing due to complex touch sensor structures, leading to low yield and high costs, along with difficulties in designing pad areas and maintaining touch sensitivity due to variations in signal transmission path lengths.
Innovation Solution
A touch display device with a single-layered touch sensor structure that reduces the number of mask processes and touch pads, utilizing intersecting X and Y touch electrode lines with connecting lines to minimize path length differences and improve sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multi-layered touch sensor structure is used, then touch sensitivity can be improved, but the manufacturing process becomes complicated and manufacturing yield decreases
Solution Approach 1:
The patent combines multiple touch sensor layers into a single-layered structure where X and Y electrode lines are formed in the same layer. This merging approach maintains the functional separation of X and Y electrodes while eliminating the need for multiple sequential deposition layers, thereby simplifying the manufacturing process and improving yield without sacrificing touch sensitivity
Solution Approach 2:
The patent uses routing lines that extend in different directions (first direction for X electrodes, second direction for Y electrodes) to connect electrodes to pad areas. This dimensional approach allows signal transmission paths to be optimized independently for each electrode type, reducing path length differences and maintaining sensitivity in the simplified single-layer structure
2Measurement precision
If the number of touch electrodes is increased to improve touch accuracy, then the number of touch pads increases, but pad area design becomes difficult
Solution Approach 1:
The patent makes routing lines serve multiple functions: they connect touch electrodes to pad areas, transmit signals, and their directional arrangement (X-direction for X electrodes, Y-direction for Y electrodes) automatically organizes the connection topology. This multi-functionality reduces the need for additional dedicated connection structures and simplifies pad area design despite increased electrode counts
3Quantity of substance
If signal transmission paths are made longer to connect more electrodes, then more electrodes can be accommodated, but touch sensitivity deteriorates due to path length differences
Solution Approach 1:
The patent applies different routing strategies for X and Y electrodes based on their local requirements. X electrode routing lines extend in the first direction while Y electrode routing lines extend in the second direction, allowing each electrode type to have optimized path lengths suited to its position and function, thereby minimizing overall path length differences and maintaining sensitivity
Data Source
AI summary
The present disclosure relates to a touch display device and a touch sensing method, and more specifically, to a touch display device and a touch sensing method that provides a single-layered touch sensor structure by a touch electrode connecting line that electrically connects touch electrodes arranged in one direction and is arranged to bypass and surround touch electrodes arranged in another direction, thereby enabling a simple manufacturing process, a high manufacturing yield, and a low manufacturing cost.