Touch Electrode Line Layout to Prevent Foreign Material Defects
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Solution Overview
Problem
Existing touch detection modules in display devices are prone to defects and foreign substance deposition during manufacturing, complicating the process and reducing production yield.
Innovation Solution
The touch detection module is designed with specific intervals and arrangements of touch driving and sensing lines, connection electrodes, and insulating layers to prevent foreign substance deposition and simplify manufacturing, including alternating electrode configurations and wider intervals to accommodate foreign materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch driving lines and sensing lines are arranged closely together, then the touch detection module achieves higher integration and smaller size, but foreign substances deposit more easily causing defects
Solution Approach 1:
The patent introduces a third dimension (vertical stacking) by forming touch driving lines and sensing lines on different layers. The touch driving lines are formed on a first insulating layer while sensing lines are formed on a second insulating layer, allowing close integration without horizontal crowding that would cause foreign substance deposition issues.
Solution Approach 2:
The patent segments the conductive lines into different layers - touch driving lines on one layer and sensing lines on another layer, separated by insulating layers. This segmentation allows each line type to be optimized independently while preventing foreign substance accumulation in narrow gaps.
2Reliability
If complex manufacturing processes are used to prevent foreign substance deposition, then defect prevention improves, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates foreign substance prevention design into the initial manufacturing steps. By designing lines with sufficient intervals from the outset and forming them through standard patterning processes, the need for additional complex prevention steps is eliminated.
Solution Approach 2:
The patent optimizes the interval parameters between lines to be sufficient for preventing foreign substance deposition while maintaining compact overall design. The interval is specifically designed to accommodate potential foreign substances without requiring complex manufacturing interventions.
3Ease of manufacture
If standard patterning processes are used for all lines, then manufacturing simplicity is maintained, but foreign substance deposition cannot be prevented
Solution Approach 1:
The patent uses vertical layering to resolve the conflict between simple patterning and foreign substance prevention. Standard patterning processes are applied to form lines on separate layers, and the vertical separation inherently prevents foreign substance issues without requiring modified patterning procedures.
Data Source
AI summary
Provided is a display device comprising a touch detection module including a plurality of driving electrodes arranged side by side in a touch sensing area, a plurality of sensing electrodes alternately arranged with the plurality of driving electrodes, a plurality of touch driving lines arranged in a touch peripheral area to supply touch driving signals to the plurality of driving electrodes, a plurality of touch sensing lines arranged in the touch peripheral area to transmit touch driving electrodes to the plurality of driving electrodes, and a touch driving circuit receiving the touch sensing signal to detect a touch position coordinate, wherein at least one of the lines among the plurality of touch driving lines and the plurality of touch sensing lines is formed to have a first interval or a second interval according to a preset size of a foreign material.