Touch Substrate Electrode Segmentation for Open Circuit Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch panel technologies cannot detect line quality issues, such as open circuits, in touch driving and sensing electrodes before the assembly of display modules, leading to waste of materials and defective products.
Innovation Solution
A touch substrate design with intercrossed touch electrodes and detection electrodes, where resistance and capacitance between electrode portions are measured via contact pads to identify open circuits, allowing for pre-manufacturing quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch electrodes are arranged with head end and tail end connected to different contact pads, then open circuit detection becomes possible, but device complexity increases
Solution Approach 1:
The touch electrode is segmented into three parts: head end, middle end, and tail end. The head end and tail end are connected to different contact pads, allowing independent electrical connection points for detection purposes. This segmentation enables open circuit detection without requiring additional external testing equipment.
Solution Approach 2:
The touch electrode structure serves multiple functions: it performs the primary touch sensing function while simultaneously enabling self-detection of line quality through its head-end and tail-end contact pad connections. This multi-functionality eliminates the need for separate detection structures.
2Reliability
If resistance and capacitance detection is performed before module assembly, then defective products are prevented, but manufacturing process complexity increases
Solution Approach 1:
The patent enables detection of open circuits and short circuits in touch electrodes before the display module assembly is completed. By performing resistance and capacitance measurements at intermediate stages using the contact pads, defects are identified early, preventing defective products from proceeding to final assembly.
Solution Approach 2:
The touch electrode structure provides self-detection capability through its inherent head-end and tail-end contact pad connections. The electrode itself serves as the detection path, eliminating the need for separate external testing structures or procedures.
3Reliability
If detection electrodes are added to the touch substrate, then line quality can be detected, but manufacturing cost increases
Solution Approach 1:
The patent merges the detection function with the existing touch electrode structure by utilizing the head end and tail end contact pad connections. No separate detection electrodes are added to the touch substrate; instead, the existing electrode structure is configured to provide detection capability, thereby avoiding additional manufacturing costs.
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
Enables the detection of open circuits and potential short circuits in touch electrodes before module assembly, preventing defective products and reducing material waste by allowing for quality testing independent of touch driving lines.
Implementation Method 1
detecting at least one of resistance and capacitance between the first touch electrode portion and the second touch electrode portion
Implementation Method 2
detecting at least one of resistance and capacitance between the first touch electrode portion and the second touch electrode portion
Data Source
AI summary
A touch substrate, a display device and a detection method of a touch electrode pattern are disclosed. The touch substrate including a plurality of touch electrodes sequentially arranged along a first direction, in which each touch electrode is extended along a second direction; each touch electrode has a head end, a middle end and a tail end; the middle end is close to a first edge of the touch substrate, and the head end and the tail end are close to a second edge of the touch substrate and are respectively connected with contact pads; and the contact pads connected with the head end and the tail end of the same touch electrode are different. The touch substrate can avoid the waste of module materials.