OLED Array Substrate Embedded Touch Electrode Design
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Solution Overview
Problem
Current OLED display technologies face challenges in achieving precise touch control as the size of OLED displays increases, particularly due to limitations in the design of touch control electrodes that result in blind areas and reduced precision.
Innovation Solution
The OLED array substrate incorporates a conductive structure with multiple portions, including a first portion extending through pixel defining layers, a second portion connecting to a first electrode, and a third portion covering the top surface, along with an insulating layer and organic light-emitting device components, to ensure a uniform touch control electrode design and improved precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of OLED display increases, then the display area is improved, but touch control precision deteriorates due to blind areas in traditional electrode design
Solution Approach 1:
The patent embeds the touch control electrode within the pixel defining layer structure, transitioning from a traditional planar electrode configuration to a multi-layer embedded configuration. The conductive structure is positioned at different depths within the pixel defining layer, creating a three-dimensional arrangement that eliminates blind areas while maintaining touch sensitivity across the entire display area.
Solution Approach 2:
The touch control electrode is nested within the pixel defining layer structure, with the conductive structure embedded inside the pixel defining layer rather than being a separate surface element. This nested configuration allows the touch electrode to utilize the internal space of the pixel defining layer, eliminating dead zones at the edges and improving overall touch coverage.
2Device complexity
If traditional touch control electrode design is used, then the structure is simple, but blind areas are created reducing touch precision
Solution Approach 1:
The pixel defining layer serves multiple functions: it defines the pixel boundaries for light emission control and simultaneously houses the touch control electrode. The conductive structure within the pixel defining layer acts as both the pixel definition boundary and the touch sensing element, eliminating the need for separate electrode structures and removing blind areas.
3Measurement precision
If conductive structure is embedded in pixel defining layers, then touch control precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the pixel defining layer formation process with the touch control electrode formation process into a single integrated manufacturing step. The conductive structure is formed simultaneously with the pixel defining layer using the same patterning and deposition processes, eliminating the need for additional electrode fabrication steps and simplifying the overall manufacturing workflow.
Data Source
AI summary
There is provided an OLED array substrate, a production method thereof, and a display apparatus. This OLED array substrate comprises: a substrate; a plurality of pixel defining layers which are provided at intervals on the substrate; and a conductive structure which is at least partly located in at least one of the plurality of pixel defining layers.