Touch-Integrated Display Encapsulation for Bend Crack Resistance
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Solution Overview
Problem
Existing touch screen-integrated display apparatuses face issues such as increased thickness and process time due to separate manufacturing of touch screen panels, which can lead to cracks and moisture permeation in bending areas, affecting reliability and reducing light transmittance and viewing angle.
Innovation Solution
A manufacturing process where inorganic insulating layers are formed with reduced ammonia gas flow rates to enhance ductility, and the thickness of these layers is minimized in emission areas to reduce stress and improve reliability, transmittance, and viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic insulating layers are formed with standard ammonia gas flow rates, then the layers have sufficient thickness for insulation, but cracks occur in bending areas and moisture permeation increases
Solution Approach 1:
The patent applies parameter changes by reducing the ammonia gas flow rate during the formation of inorganic insulating layers. This parameter modification changes the deposition characteristics, resulting in layers with enhanced ductility and reduced cracking tendency in bending areas, while maintaining adequate insulation properties
Solution Approach 2:
The patent applies local quality by forming inorganic insulating layers with different thicknesses in different regions. The layers are thinner in bending areas to reduce stress concentration and cracking, while maintaining sufficient thickness in non-bending areas for adequate insulation, thus addressing both reliability and moisture protection requirements
2Illumination intensity
If the thickness of inorganic insulating layers is reduced in emission areas, then light transmittance and viewing angle improve, but the layers become more susceptible to cracks and moisture permeation
Solution Approach 1:
The patent implements local quality by spatially varying the thickness of inorganic insulating layers. In emission areas, the layers are made thinner to improve light transmittance and viewing angle characteristics. In bending areas and non-emission regions, the layers maintain sufficient thickness or are formed with modified parameters to ensure structural integrity and resistance to cracking and moisture permeation
Solution Approach 2:
The patent applies parameter changes by modifying the ammonia gas flow rate specifically for forming inorganic insulating layers in different regions. This results in layers with different ductility characteristics - enhanced ductility in bending areas to prevent cracking, while controlling thickness in emission areas to optimize optical performance
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
The approach reduces cracks and moisture permeation in bending areas, enhancing the reliability and optical performance of the display apparatus while maintaining structural integrity.
Implementation Method 1
formed by lowering a flow rate of ammonia NH3 gas during the process of forming the first inorganic insulating layer and the second inorganic insulating layer
Data Source
AI summary
A display apparatus can include a substrate including a display area and a non-display area, a transistor on the substrate, a dam in the non-display area, an encapsulation part on the transistor and including first and second inorganic encapsulation layers and an organic encapsulation layer between the first and second inorganic encapsulation layers, a first touch insulating layer on the encapsulation part, a touch part on the first touch insulating layer, and a second touch insulating layer on the touch part. The first inorganic encapsulation layer, the second inorganic encapsulation layer, the first touch insulating layer and the second touch insulating layer extend from the dam toward an edge of the substrate. Also, the touch part has a mesh shape, the display area includes sub-pixels, and the second touch insulating layer includes an opening disposed at an area overlapping with the display area corresponding to one of the sub-pixels.