OLED Touch Display Substrate Transparent Electrode Encapsulation
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Solution Overview
Problem
OLED touch display devices face performance impairment due to chemical reactions between metal cathodes and oxygen, leading to increased thickness and production costs when using traditional thin film encapsulation methods.
Innovation Solution
An OLED touch display substrate with a transparent electrode layer, a touch layer comprising interconnected electrodes and bridges, and inorganic-organic-inorganic stack structure for encapsulation, which reduces thickness and production processes while preventing vapor and oxygen permeation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal cathode is used in OLED touch display device, then the device can provide good electrical conductivity and charge injection, but the metal cathode reacts with vapor and oxygen permeating the device, affecting charge injection and potentially impairing device performance
Solution Approach 1:
The patent introduces an intermediate protective layer between the metal cathode and the organic layer. This protective layer acts as a mediator that prevents direct contact between the metal cathode and harmful substances (vapor and oxygen), thereby eliminating the harmful chemical reactions while maintaining electrical conductivity and charge injection functionality.
Solution Approach 2:
The patent employs composite material structures, specifically combining metal cathode materials with protective coating materials to create a multi-layer cathode assembly. This composite structure provides both the electrical conductivity of metal and the protective properties of the coating material, resolving the contradiction between conductivity and chemical stability.
2Reliability
If traditional thin film encapsulation is used to prevent vapor and oxygen permeation, then the device is protected from chemical reactions, but the device thickness increases and production costs increase
Solution Approach 1:
The patent merges the encapsulation function with the existing touch control layer structure. By integrating the protective function into the touch control electrode layers and their insulating coatings, the device achieves vapor and oxygen protection without adding separate encapsulation layers, thereby avoiding increased thickness.
Solution Approach 2:
The patent makes the touch control layer structure multi-functional by enabling it to serve both as the touch control electrode assembly and as the protective encapsulation barrier. This eliminates the need for dedicated encapsulation layers, reducing overall device thickness while maintaining protection against vapor and oxygen.
3Reliability
If traditional thin film encapsulation is used to prevent vapor and oxygen permeation, then the device is protected from chemical reactions, but the production process becomes more complex and costs increase
Solution Approach 1:
The patent combines the encapsulation manufacturing process with the existing touch control layer fabrication process. By forming protective insulating layers during the same manufacturing steps used to create touch control electrodes, the production process complexity remains unchanged while achieving effective encapsulation protection.
Data Source
AI summary
The present disclosure relates to the field of display technologies, and provides in embodiments an OLED touch display substrate, a manufacturing method thereof and a corresponding touch display device. Specifically, the OLED touch display substrate comprises: a first electrode layer and a second electrode layer opposite to each other; an organic layer between the first electrode layer and the second electrode layer; a touch layer on a side of the second electrode layer facing away from the organic layer; and a first insulating layer between the touch layer and the second electrode layer. The second electrode layer is a transparent electrode layer.