OLED Display Panel Touch Functional Layer High-Temperature Processing
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Solution Overview
Problem
Existing OLED display panels suffer from poor touch performance due to low-temperature processing, which affects the moisture and oxidation resistance of touch functional layers and the encapsulation layer, leading to suboptimal performance.
Innovation Solution
The OLED display panel incorporates a touch functional layer with self-capacitive or inter-capacitor touch electrodes, using transparent conductive materials or electrodes with holes to improve transparency, and is manufactured under high-temperature processes to prevent damage to the organic light emitting material, with the touch functional layer formed beneath the driving circuit and light emitting layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If low-temperature processing is used for OLED organic light emitting materials, then the organic light emitting material can be manufactured, but the moisture and oxidation resistance of the touch functional layer and encapsulation layer deteriorates
Solution Approach 1:
The patent divides the manufacturing process into two separate stages: first forming the touch functional layer at low temperature, then forming the OLED layers at high temperature. This segmentation allows each layer to be processed at its optimal temperature, resolving the contradiction between low-temperature processing requirements for OLED materials and high-temperature requirements for moisture/oxidation resistance.
Solution Approach 2:
The touch functional layer is formed in advance before the OLED organic light emitting materials are deposited. This preliminary action at low temperature preserves the OLED materials' properties, while subsequent high-temperature processing of the encapsulation layer at a later stage ensures moisture and oxidation resistance without damaging the already-formed OLED layers.
2Temperature
If low-temperature processing is used for OLED organic light emitting materials, then the organic light emitting material can be manufactured, but the touch performance of the touch functional layer deteriorates
Solution Approach 1:
The manufacturing process is segmented into distinct temperature zones and time periods, allowing the touch functional layer to be processed at low temperature initially, then subjected to high-temperature treatment later when the OLED layers are formed. This resolves the contradiction by separating the temperature requirements for different functional layers.
Solution Approach 2:
The patent changes the temperature parameter dynamically during the manufacturing process - low temperature for OLED material deposition, then high temperature for encapsulation layer formation. This parameter change allows both low-temperature OLED manufacturing and high-temperature touch performance optimization to coexist.
3Ease of operation
If the touch functional layer is formed above the light emitting functional layer, then the touch function can be implemented, but the organic light emitting material is damaged by low-temperature processing
Solution Approach 1:
The patent inverts the conventional layer formation sequence by forming the touch functional layer first at low temperature, then forming the OLED light emitting functional layer at high temperature. This inversion resolves the contradiction by ensuring the OLED materials are never exposed to low-temperature processing that would damage them, while still achieving touch functionality.
Solution Approach 2:
The touch functional layer is formed as a preliminary structure before the OLED layers are deposited. This preliminary formation at low temperature does not damage the OLED materials because they are not yet present, and subsequent high-temperature processing of the encapsulation layer improves moisture resistance without affecting the touch layer.
Data Source
AI summary
The present application provides an OLED display panel and a display device, the OLED display panel includes: a flexible substrate; a touch functional layer formed on the flexible substrate; a driving circuit layer formed on the touch functional layer; a light emitting functional layer formed on the driving circuit layer; and an encapsulation layer formed on the light emitting functional layer.