Light Guide Layer for UV Curing in OLED Display Panels
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Solution Overview
Problem
Current OLED display panel manufacturing methods face challenges in effectively curing photocurable materials without damaging other layers, particularly due to issues with UV light absorption by quantum dot materials and reflection effects that hinder the curing process, leading to unstable encapsulation and reduced luminous efficiency.
Innovation Solution
A display panel design incorporating a light guide layer between the substrates to direct curing light to the photocurable material, ensuring effective curing without adverse effects on other layers, using a light guide layer with openings and refractive index differences to facilitate light propagation and prevent color crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV light is used to cure photocurable material in OLED display panel manufacturing, then the photocurable material can be cured effectively, but the quantum dot materials absorb the UV light causing damage and reducing luminous efficiency
Solution Approach 1:
The patent introduces a transparent resin layer as an intermediary between the UV light source and the quantum dot materials. This layer has high transmittance to UV light, allowing the light to pass through to cure the photocurable material while protecting the quantum dot materials from direct UV exposure and absorption damage
Solution Approach 2:
The patent segments the functional layers by positioning the transparent resin layer specifically between the UV light source and the quantum dot materials, separating the curing function from the light-emitting function to avoid harmful interactions
2Reliability
If UV light is directed through the display substrate to cure adhesive layers, then curing can be achieved, but reflection effects occur that hinder the curing process
Solution Approach 1:
The patent inverts the conventional curing approach by directing UV light from the opposite side (through the color filter substrate rather than the display substrate), eliminating reflection effects and enabling effective curing of adhesive layers without energy loss
3Manufacturing precision
If quantum dot materials are exposed to UV light for curing, then the photocurable material can be cured, but the quantum dot materials are damaged reducing luminous efficiency
Solution Approach 1:
The transparent resin layer serves as a protective intermediary that allows UV light to pass through for precise curing of photocurable materials while preventing direct UV exposure to quantum dot materials, thereby maintaining their luminous efficiency
Solution Approach 2:
The patent applies different properties to different regions: the transparent resin layer has high UV transmittance in the curing region while the quantum dot materials maintain their light-emitting properties in the display region, achieving local optimization of both curing and luminous efficiency
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
Ensures effective curing of the photocurable material while preventing damage to other layers, improving encapsulation and maintaining luminous efficiency, thereby enhancing the manufacturing process for OLED display panels.
Implementation Method 1
directing light from a side face of the light guide layer into the light guide layer to cure the photocurable material included in the first adhesive layer
Implementation Method 2
curing the photocurable material included in the first adhesive layer, thereby forming a photo-cured layer
Data Source
AI summary
The present disclosure relates to a display panel. The display panel includes a display substrate, an opposite substrate, and a first adhesive layer and light guide layer located between the display substrate and the opposite substrate and stacked on each other. The first adhesive layer includes a photo-cured layer formed by curing a photocurable material layer. And the light guide layer is used to direct light to the photocurable material layer during the curing to form the cured layer.