Embedded Electrodes in Planarization Layers for OLED Touch Integration
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Solution Overview
Problem
Capacitive touch screens face challenges in integrating touch control and sensing functions without increasing the thickness of organic light-emitting diode (OLED) substrates, while maintaining high resolution and light emission efficiency.
Innovation Solution
A display substrate design featuring a base substrate with a color filter layer, planarization layers, and embedded first and second electrodes in grooves, where the electrodes are formed using metal nano-particle ink and photon or laser sintering, allowing for touch control and sensing without additional thickness, and incorporating organic electroluminescent devices with a color filter layer for improved integration and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional capacitive touch screen structures are used with separate touch control and sensing electrode layers, then touch control and sensing functions can be achieved, but the substrate thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent combines touch control electrodes and sensing electrodes into a single planarization layer, forming both types of electrodes simultaneously through one set of grooves and filling operations. This merging eliminates the need for separate electrode layers, achieving integrated touch control and sensing functions while reducing substrate thickness and simplifying manufacturing processes.
2Adaptability or versatility
If additional electrode layers are added for touch control functionality, then capacitive touch capability is achieved, but the device complexity and manufacturing steps increase
Solution Approach 1:
The planarization layer serves multiple functions: it provides surface planarity for display quality and simultaneously houses both touch control electrodes and sensing electrodes. The grooves in the planarization layer are designed to accommodate both types of electrodes, allowing the same structural element to fulfill multiple functional roles, thereby reducing overall device complexity while maintaining capacitive touch capability.
3Measurement precision
If multiple electrode layers are implemented for high resolution touch control, then touch resolution is improved, but the manufacturing precision requirements and process complexity increase
Solution Approach 1:
The patent segments the planarization layer into multiple grooves that are precisely positioned to accommodate different electrode types. By dividing the electrode arrangement into discrete, pre-defined groove positions, the manufacturing process achieves high precision electrode placement without requiring complex multi-layer alignment procedures. The grooves act as guides that simplify the positioning of both touch control and sensing electrodes.
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 solution enables enhanced integration of touch control and sensing functions within the OLED substrate, achieving high resolution and improved brightness and color purity without increasing thickness, and allows for the omission of a circular polarizer, resulting in a thinner and lighter display panel.
Implementation Method 1
the electrodes are formed using metal nano-particle ink and photon or laser sintering
Implementation Method 2
the electrodes are formed using metal nano-particle ink and photon or laser sintering
Implementation Method 3
the display unit includes a plurality of organic electroluminescent devices
Data Source
AI summary
The present application provides a display substrate, a manufacturing method thereof, and a display apparatus. The display substrate of the present invention includes a base substrate, a display unit provided on the base substrate, a color filter layer provided on the display unit, a planarization layer provided on a surface of the color filter layer distal to the display unit, and a plurality of first electrodes and a plurality of second electrodes provided in the planarization layer. The planarization layer includes a first planarization layer and a second planarization layer, the plurality of first electrode are embedded in the first planarization layer, and the plurality of second electrodes are embedded in the second planarization layer.