Flexible Circuit Spacing for Touch Panel Bonding
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Solution Overview
Problem
Existing electro-luminescence display devices with on-cell type touch screen panels face challenges in manufacturing, particularly in preventing cracking of the touch screen panel pad during film-on-glass bonding due to insufficient indentation and pressure distribution.
Innovation Solution
A novel structure where the lower layer of the flexible printed circuit board is spaced apart from the ends of the adhesive and touch screen panel by a predetermined distance, reducing the pressure on the anisotropic conductive film and adhesive during bonding, and an anti-oxidation layer is applied to protect the conductive layer from oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lower layer of the flexible printed circuit board is positioned close to the touch screen panel during bonding, then bonding strength is improved, but cracking of the touch screen panel pad occurs due to excessive pressure concentration
Solution Approach 1:
The patent applies different spatial zones with distinct functions: the lower layer is positioned at a first distance from the adhesive end to concentrate pressure where needed, while simultaneously maintaining a second distance from the touch screen panel end to avoid excessive pressure concentration that causes cracking. This local differentiation of spatial zones resolves the contradiction between bonding strength and cracking resistance.
2Reliability
If the lower layer covers the entire conductive layer, then electrical connectivity is improved, but oxidation of the conductive layer increases due to exposure
Solution Approach 1:
The patent implements local quality by applying an anti-oxidation layer specifically on the conductive layer at the position where it contacts the touch screen panel, while maintaining the lower layer's insulating function in other areas. This localized protection approach ensures electrical connectivity is preserved while preventing oxidation at the critical contact interface.
3Reliability
If the lower layer is positioned far from the adhesive end, then cracking is suppressed, but bonding strength decreases due to insufficient pressure
Solution Approach 1:
The patent optimizes the spatial parameters by defining specific distance relationships: the lower layer is positioned at a first distance from the adhesive end and a second distance from the touch screen panel end. By carefully controlling these dimensional parameters, the patent achieves both sufficient bonding strength and cracking resistance simultaneously.
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 approach effectively suppresses cracking of the touch screen panel pad and ensures reliable electrical connectivity, enhancing the durability and performance of the electro-luminescence display device.
Implementation Method 1
Another portion of the conductive layer is attached to the touch screen panel by an anisotropic conductive film
Implementation Method 2
a touch screen panel attached to the display panel by an adhesive
Data Source
AI summary
The electroluminescence display device and the method of manufacturing the same are disclosed. The electroluminescence display device may include an on-cell type touch screen panel and a flexible printed circuit (FPC) for slimming down and cost reduction. It is possible to suppress cracks from being generated in the pad portion of the touch screen panel during film on glass (FOG) bonding by arranging the lower layer of the FPC at a certain distance away from the end of the touch screen panel.