Touch Sensor Integrated Display Device Aperture Ratio Optimization
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Solution Overview
Problem
Existing touch sensor integrated type display devices face issues with complex designs and reduced display characteristics due to the need for separate wires and contact holes for connecting touch driving and sensing electrodes, which also lead to increased thickness and manufacturing costs.
Innovation Solution
The solution involves forming touch driving and sensing electrodes on a common layer with resistance reducing wires that cross over bottlenecks, eliminating the need for contact holes and reducing mutual capacitance, thereby improving aperture ratio and touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate wires and contact holes are used to connect touch driving and sensing electrodes, then electrical connection is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the touch driving electrode and touch sensing electrode into a single common electrode layer, eliminating the need for separate connection wires and contact holes. This integration reduces structural complexity while maintaining electrical functionality through capacitive coupling between overlapping electrode regions.
Solution Approach 2:
The common electrode layer serves multiple functions simultaneously: it acts as both the touch driving electrode and touch sensing electrode, and also functions as the common electrode for the liquid crystal display. This multi-functionality eliminates the need for separate dedicated touch sensor electrodes and their associated connection structures.
2Reliability
If contact holes are formed to connect electrodes, then electrical connection is established, but aperture ratio decreases
Solution Approach 1:
The patent extracts and eliminates the contact hole structure from the design by using capacitive coupling between overlapping transparent electrode regions. This removal of contact holes increases the aperture ratio while maintaining electrical connection functionality through the electric field formed between the driving and sensing electrode regions.
3Adaptability or versatility
If multiple layers and processes are used for on-cell touch sensor, then integration is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines the touch sensor electrode formation process with the existing liquid crystal display manufacturing process. The common electrode layer is formed using the same transparent conductive material and deposition processes already used for the display electrodes, eliminating the need for separate touch sensor manufacturing steps and reducing overall manufacturing cost.
4Length of stationary object
If touch electrodes are formed on the same layer, then thickness is reduced, but mutual capacitance interference increases
Solution Approach 1:
The patent segments the common electrode layer into distinct driving electrode regions and sensing electrode regions that are spatially separated and patterned to minimize overlapping area. This segmentation reduces mutual capacitance interference while maintaining the thin-profile advantage of single-layer construction.
Solution Approach 2:
The patent applies different local patterns and spacing to different regions of the electrode layer. The driving and sensing electrode regions are designed with specific geometric configurations and spacing that optimize touch detection while minimizing parasitic capacitance, creating local quality variations that reduce interference.
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 design simplifies the connection of touch electrodes, increases the aperture ratio, and enhances touch sensitivity by reducing mutual capacitance and parasitic capacitance, making it suitable for large-sized high-resolution products.
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 capable of recognizing a user's touch operation is disclosed. The touch sensor integrated type display device includes a plurality of first electrodes each including a plurality of first electrode patterns, which are connected through a plurality of first bottlenecks, the plurality of first electrodes being arranged in a first direction, and a plurality of second electrodes arranged in a second direction crossing the first direction. The plurality of first electrode patterns and the plurality of second electrodes are alternately disposed. At least one unit pixel electrode is disposed corresponding to each of the plurality of first electrode patterns.