Display Conductive Pattern for Static Discharge
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Solution Overview
Problem
Existing liquid crystal displays with touch detection functions face challenges in reducing static electricity-induced disturbances without compromising optical properties, as increasing the thickness or area ratio of conductive patterns to lower sheet resistance degrades transmittance.
Innovation Solution
A display design with a conductive pattern on the opposing substrate, covered by a protection layer and a conductive layer, where the conductive pattern has a sheet resistance not exceeding 8 Ω/square and an area ratio of 1 to 22% overlap with pixels, and the conductive layer has a higher resistance than the pattern, facilitating static electricity discharge without impacting optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness or area ratio of the conductive pattern is increased to reduce sheet resistance, then static electricity discharge capability is improved, but transmittance is degraded and optical properties are deteriorated
Solution Approach 1:
The invention transitions from a single-layer conductive pattern to a multi-layer structure with a conductive pattern layer and a separate conductive film layer. This dimensional change allows the conductive pattern to provide discharge capability while the transparent conductive film maintains optical properties, resolving the contradiction between reliability and transmittance.
Solution Approach 2:
The invention uses a composite structure combining a conductive pattern (metal oxide semiconductor layer) with a transparent conductive film. This composite approach allows the metal oxide semiconductor to provide low sheet resistance for static electricity discharge while the transparent conductive film ensures high transmittance, thus resolving the contradiction between discharge capability and optical properties.
2Reliability
If the sheet resistance of the conductive pattern is reduced to facilitate static electricity discharge, then discharge efficiency is improved, but the conductive pattern requires greater thickness or area ratio which degrades transmittance
Solution Approach 1:
The invention adds a separate conductive film layer dimension to the structure, allowing the conductive pattern to be thin with small area ratio while achieving low overall sheet resistance through the combination with the transparent conductive film. This resolves the contradiction between discharge efficiency and material quantity.
Solution Approach 2:
The invention changes the electrical conductivity parameter by introducing a transparent conductive film with controlled sheet resistance (10-1000 Ω/square) in combination with the conductive pattern. This parameter change allows achieving low overall sheet resistance for efficient static electricity discharge without requiring increased thickness or area of the conductive pattern, thus maintaining high transmittance.
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
Effectively reduces static electricity disturbances while maintaining high transmittance and preventing optical property deterioration, ensuring clear image display and reliable touch detection.
Implementation Method 1
static electricity applied to the display can be discharged to the exterior of the display through the conductive layer or the conductive pattern
Data Source
AI summary
To reduce disturbances in display of images due to static electricity without deteriorating optical properties in a display. The display includes a conductive pattern provided on the upper surface of the substrate, a protection layer provided on the upper surface of the substrate to cover the conductive pattern, and a conductive layer provided on the protection layer. The sheet resistance of the conductive pattern is not more than 8 Ω/square. A ratio of the total sum of areas of portions of the plurality of sub-pixels that overlap the conductive pattern in a plan view to the total sum of the areas of the plurality of sub-pixels is 1 to 22%. A sheet resistance of the conductive layer is higher than the sheet resistance of the conductive pattern.