Touch Sensor Routing Segmentation for Display Devices
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Solution Overview
Problem
Mutual capacitive touch sensors in display devices face challenges in detecting touch positions with precision due to small mutual capacitance and complex routing wire constructions, leading to reduced touch sensitivity and increased parasitic capacitance.
Innovation Solution
The display device integrates a touch sensor with routing wires arranged in both directions crossing each other, overlapping gate and data lines, and using multiplexers to supply common and touch driving voltages, which reduces parasitic capacitance and enhances touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mutual capacitive touch sensor uses X-axis and Y-axis electrode strings arranged in matrix, then touch sensing capability is enabled, but parasitic capacitance increases and touch detection precision decreases
Solution Approach 1:
The patent segments the routing wire connections by direction: first routing wires connect first electrode strings in a first direction, while second routing wires connect second electrode strings in a second direction crossing the first direction. This segmentation reduces parasitic capacitance interference between orthogonal electrode strings, thereby improving touch position detection precision while maintaining full touch sensing capability.
2Reliability
If routing wires are arranged to connect all touch electrodes, then touch sensor coverage is improved, but device complexity increases
Solution Approach 1:
The patent introduces a two-dimensional routing wire arrangement where first routing wires extend in a first direction and second routing wires extend in a second direction crossing the first direction. This dimensional approach allows comprehensive connection of all touch electrodes with organized, systematic routing rather than complex random connections, reducing overall device complexity while ensuring complete electrode 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 improves touch sensitivity by reducing parasitic capacitance and ensuring all touch electrodes are connected, thereby enhancing the accuracy and reliability of touch detection.
Implementation Method 1
The self-capacitive touch sensor may have a plurality of independent patterns in a touch area of a touch sensing panel, and measure changes in capacitance of each independent pattern, thereby detecting whether or not a touch operation is performed.
Implementation Method 2
the mutual capacitive touch sensor may have X-axis direction electrode strings (for example, driving electrode strings) and Y-axis direction electrode strings (for example, sensing electrode strings) which cross each other in the touch area of the touch sensing panel
Data Source
AI summary
Disclosed is a display device integrated with a touch sensor that may include a plurality of gate lines and a plurality data lines crossing each other; a plurality of pixel electrodes between the data lines; a plurality of touch/common electrodes arranged in a first direction and a second direction that cross each other, each of the plurality of touch/common electrodes overlapping at least one pixel electrode; 1-1 routing wires connected to 1-1 touch/common electrodes; 1-2 routing wires connected to 1-2 touch/common electrodes; 2-1 routing wires connected to 2-1 touch/common electrodes; and 2-2 routing wires connected to 2-2 touch/common electrodes.