Anti-Reflection Film with Gradient Refractive Index for OLED Displays
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Solution Overview
Problem
The high cost and color cast issues associated with conventional anti-reflection structures in OLED display panels hinder the effective reduction of ambient light reflection, impacting display quality and manufacturing costs.
Innovation Solution
A display module with an anti-reflection film comprising a buffer layer and a function layer, where the refractive index of the buffer layer is greater than that of the function layer, allowing for destructive interference of ambient light and reducing reflection with fewer layers, thereby minimizing thickness and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional anti-reflection structure is formed on the OLED display panel, then the reflection of ambient light is reduced, but the manufacturing cost is substantially high
Solution Approach 1:
The anti-reflection film is divided into multiple layers with different refractive indices (first anti-reflection layer, second anti-reflection layer, and third anti-reflection layer), where each layer has a specific refractive index range. This segmentation allows for effective anti-reflection performance while using simpler and more cost-effective materials compared to conventional single-layer structures
Solution Approach 2:
The patent specifies precise refractive index parameters for each layer (first layer: 1.30-1.45, second layer: 1.45-1.60, third layer: 1.60-1.75) to optimize anti-reflection performance. By controlling these optical parameters, the structure achieves effective ambient light reflection reduction while maintaining manufacturing feasibility
2Object-affected harmful factors
If multiple layers are used in the anti-reflection film to reduce reflection, then the anti-reflection effect is improved, but the thickness of the display panel increases
Solution Approach 1:
The patent employs thin film structures for the anti-reflection layers, where each layer has a controlled thickness designed to achieve optimal anti-reflection performance. The use of multiple thin layers with gradient refractive indices provides effective anti-reflection while minimizing the overall thickness increase of the display panel
3Object-affected harmful factors
If a conventional anti-reflection coating is applied, then the reflection is reduced, but color cast issues occur affecting display quality
Solution Approach 1:
The anti-reflection structure is segmented into multiple layers with progressively increasing refractive indices from the outer surface toward the display panel. This gradient structure distributes the reflection reduction across different wavelengths, preventing color cast and maintaining neutral color reproduction in the display
Solution Approach 2:
The patent uses composite material structures with different refractive indices arranged in specific layers. This composite approach allows for broadband anti-reflection performance that maintains color accuracy, avoiding the color cast problems associated with single-material coatings
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 proposed solution effectively reduces ambient light reflection, enhances display quality, and avoids color cast issues, achieving a cost-effective and thin anti-reflection structure for OLED display panels.
Implementation Method 1
an anti-reflection film disposed on a light-emitting side of the display panel, wherein the anti-reflection film includes a buffer layer and a function layer disposed on a side of the buffer layer away from the display panel, and a refractive index of the buffer layer is greater than a refractive index of the function layer
Data Source
AI summary
A display module and a display device are provided. The display module includes a display panel, and an anti-reflection film disposed on a light-emitting side of the display panel. The anti-reflection film includes a buffer layer and a function layer disposed on a side of the buffer layer away from the display panel, and a refractive index of the buffer layer is greater than a refractive index of the function layer.