Integrated Touch Sensor Electrode Design for Aperture Ratio
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Solution Overview
Problem
Touch sensor integrated type display devices face challenges with reduced aperture ratio due to complex wire configurations and increased mutual and parasitic capacitance, which affect touch performance and visibility.
Innovation Solution
The design includes a configuration where touch driving and sensing electrodes are formed on the same layer, with resistance reducing wires overlapping data or gate lines, reducing the need for contact holes and minimizing electrode overlap, thereby simplifying wire connections and reducing capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch driving electrodes and touch sensing electrodes are formed on the same layer and connected through contact holes, then the touch sensor can recognize touch operations, but the aperture ratio is reduced due to complex wire configurations and multiple contact holes
Solution Approach 1:
The patent merges the touch driving electrode and touch sensing electrode into a single electrode layer, eliminating the need for separate electrode layers and their associated contact holes. This integration maintains touch recognition functionality while significantly reducing the number of contact holes and improving the aperture ratio.
Solution Approach 2:
The single electrode layer performs dual functions as both a touch driving electrode and a touch sensing electrode. By making the electrode serve multiple purposes, the patent eliminates the need for separate electrode structures and their corresponding connection pathways, thereby increasing the aperture ratio.
2Ease of manufacture
If touch driving electrodes and touch sensing electrodes are formed on the same layer, then the manufacturing process is simplified, but mutual capacitance and parasitic capacitance increase, affecting touch performance
Solution Approach 1:
The patent applies different properties to different regions of the single electrode layer. By controlling the electrical characteristics in specific areas, the design reduces mutual capacitance and parasitic capacitance effects while maintaining the simplified single-layer structure, thus preserving touch performance.
3Area of stationary object
If resistance reducing wires are formed to overlap data or gate lines, then the aperture ratio is enhanced and wire connections are simplified, but the electrical conductivity requirements become more challenging
Solution Approach 1:
The resistance reducing wires are merged with the data lines or gate lines, forming an integrated structure that serves both as a signal transmission line and a resistance reduction path. This eliminates the need for separate resistance reduction structures and maintains electrical conductivity while maximizing the aperture ratio.
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 enhances the aperture ratio, improves touch performance by reducing mutual and parasitic capacitance, and increases touch sensitivity, particularly beneficial for large-sized high-resolution displays.
Implementation Method 1
measures changes in a mutual capacitance generated in a touch operation and recognizes a touch or non-touch input and a touch position in the touch input
Data Source
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AI summary
A touch sensor integrated type display device includes gate lines and data lines crossing over the gate lines, a plurality of pixel electrodes respectively disposed in areas defined by the crossing of the gate lines and the data lines, a plurality of 1-1 electrodes each of which is disposed correspondingly to some of the pixel electrodes and has a first size, a plurality of 1-2 electrodes connected to the plurality of 1-1 electrodes, each of which is disposed correspondingly to another some of the pixel electrodes, and has a second size greater than the first size, and a plurality of second electrodes, each of which is disposed between the 1-1 and 1-2 electrode and is arranged in a direction crossing the 1-1 and 1-2 electrodes. The two 1-1 electrodes are disposed between the 1-2 electrodes in parallel.