OLED Touch Display Panel With Integrated Circular Polarizer
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Solution Overview
Problem
Conventional touch panels for OLED display devices require an additional attachment process, increasing the thickness and making it difficult to achieve flexibility, lightweight, and thin designs.
Innovation Solution
An OLED touch display panel is designed with touch electrodes formed on the internal film layer, utilizing indium tin oxide for driving electrode lines and conductive filaments or carbon nanotubes for sensing electrode lines, integrated within a circular polarizer plate, eliminating the need for a separate touch panel attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate touch panel is attached to the OLED display panel surface, then touch functionality is achieved, but the thickness of the OLED display device increases
Solution Approach 1:
The patent merges the touch panel structure with the OLED display panel by integrating touch electrodes into the OLED's internal film layers. The cathode metal layer of the OLED serves as the driving electrode, and additional sensing electrodes are formed within the encapsulation layer or circular polarizer plate, eliminating the need for a separate attached touch panel.
Solution Approach 2:
The cathode metal layer of the OLED display panel is designed to serve dual functions: as the cathode for light emission and as the driving electrode for touch sensing. This multi-functionality reduces the need for additional separate components and attachment processes.
2Reliability
If a separate touch panel is attached to the OLED display panel surface, then touch functionality is achieved, but the weight of the OLED display device increases
Solution Approach 1:
The touch panel structure is merged with the OLED display panel's internal layers, eliminating the need for a separate attached touch panel component. This integration removes the weight of the separate touch panel assembly while maintaining touch functionality through the integrated electrodes.
3Reliability
If a separate touch panel is attached to the OLED display panel surface, then touch functionality is achieved, but the manufacturing process complexity increases
Solution Approach 1:
The touch electrode layers are integrated into the OLED manufacturing process itself. The cathode metal layer is patterned during OLED fabrication to form driving electrodes, and sensing electrodes are formed within the encapsulation or polarizer layers, eliminating the separate touch panel attachment process and reducing manufacturing complexity.
4Reliability
If conventional ITO material is used for touch electrodes, then electrical conductivity is achieved, but flexibility requirements are not met
Solution Approach 1:
The patent uses composite material structures for the touch electrodes. The cathode metal layer (such as aluminum, silver, or other flexible metals) serves as the driving electrode, replacing conventional ITO. This metallic composite structure provides both the required electrical conductivity and the flexibility needed for bendable displays.
Data Source
AI summary
The present invention provides an OLED touch display panel including an array substrate, an organic light-emitting layer; and a cathode metal layer patterned to form first touch signal lines arranged parallel to and spaced from each other. The OLED touch display panel further including an encapsulation layer; a circular polarizer plate; second touch signal lines disposed in or at a side of the circular polarizer plate; and the first touch signal lines and the second touch signal lines formed a touch panel.