Touch Sensor Electrode Sizing for Uniform Accuracy
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Solution Overview
Problem
Touch sensor integrated type display devices face issues with uniform touch accuracy, particularly at the edges and middle of the active area, due to differences in the sensing region and the lack of sub-routing wires connected to outermost first touch electrodes, leading to increased touch channel load and potential connectivity problems with screen size expansion.
Innovation Solution
The design includes first touch electrodes that are smaller in size at the outermost edges of the active area compared to those in the inner columns, with a reconfigured layout of sub-routing wires and main routing wires to ensure equal sensing area coverage and improved touch accuracy, while maintaining connectivity and minimizing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all first touch electrodes are made the same size, then manufacturing is simplified, but touch accuracy becomes non-uniform at edges and middle of the active area
Solution Approach 1:
The patent applies local quality by making first touch electrodes at the outermost both sides smaller than those at inner columns. This differential sizing compensates for the different sensing regions at edges versus middle of the active area, achieving uniform touch accuracy across the entire display while maintaining a relatively simple manufacturing process.
2Device complexity
If sub routing wires are not connected to outermost first touch electrodes, then device complexity is reduced, but touch channel load increases and connectivity problems occur
Solution Approach 1:
The patent segments the routing wire configuration by introducing sub routing wires that specifically connect to outermost first touch electrodes. This segmentation ensures that all touch channels are properly connected and loaded uniformly, improving reliability without significantly increasing overall device complexity.
3Area of stationary object
If screen size is expanded, then display area increases, but touch channel load increases and connectivity problems arise
Solution Approach 1:
The patent addresses screen size expansion by reconfiguring the routing wire layout in the bezel area rather than simply scaling up the existing configuration. This dimensional reorganization ensures that touch channels remain properly connected and loaded even as the display area increases, maintaining reliability across different screen sizes.
Data Source
AI summary
A touch sensor integrated type display device includes first touch electrodes located in the active area and divided in first and second directions crossing each other; second touch electrodes located in the active area, divided in the first direction, and alternating with the first touch electrodes arranged in the first direction; and a plurality of first sub routing wires respectively connected to the plurality of first touch electrodes, and arranged side by side in the second direction, wherein the first touch electrodes located in outermost both sides of the active area in the first direction, among the first touch electrodes arranged in the second direction, are smaller in size than another first touch electrodes.