Reflection Control Layer for Display Devices
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Solution Overview
Problem
Current display devices face challenges in maintaining high display quality and structural reliability over time, with existing structures failing to effectively absorb non-emission wavelength bands and ensuring long-term visibility and color accuracy.
Innovation Solution
A display device with a reflection control layer comprising a first layer and a second layer, where the second layer has a thickness less than the first layer and includes a liquid repellent material, selectively absorbs light in non-emission wavelength bands, and is integrated with a light-emitting layer and a low reflection inorganic layer to improve display quality and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer reflection control layer is used, then the structure is simple, but it cannot effectively absorb multiple non-emission wavelength bands and ensure long-term stability
Solution Approach 1:
The reflection control layer is divided into multiple layers (first reflection control layer and second reflection control layer), each with different thicknesses and liquid repellent material concentrations. This segmentation allows each layer to target specific non-emission wavelength bands, improving overall absorption effectiveness while maintaining manageable structural complexity
Solution Approach 2:
Different regions of the reflection control structure have different properties: the first layer has higher liquid repellent material concentration for absorbing certain wavelength bands, while the second layer has lower concentration for absorbing other wavelength bands. This local differentiation optimizes light absorption across multiple spectral ranges while ensuring long-term stability through varied material distribution
2Reliability
If uniform thickness is used throughout the reflection control layer, then manufacturing is simple, but it cannot optimize absorption across different non-emission wavelength bands
Solution Approach 1:
The reflection control layer is segmented into multiple sub-layers with different thicknesses. The first reflection control layer has a first thickness optimized for absorbing one set of non-emission wavelengths, while the second reflection control layer has a second thickness optimized for absorbing other non-emission wavelengths. This segmentation enables spectral optimization without requiring extremely precise uniform thickness control across the entire structure
Solution Approach 2:
The thickness parameter is varied across different layers of the reflection control structure. By changing the thickness parameter from the first layer to the second layer, the structure optimizes its light absorption characteristics for different wavelength bands, improving color accuracy while maintaining manufacturing feasibility
3Reliability
If liquid repellent material is uniformly distributed, then the structure is simple to manufacture, but it cannot provide enhanced liquid repellency and long-term durability
Solution Approach 1:
The liquid repellent material is non-uniformly distributed with different concentrations in different layers. The first reflection control layer contains a first concentration of liquid repellent material, while the second reflection control layer contains a second concentration. This local quality variation enhances overall liquid repellency by creating a gradient structure that prevents liquid penetration more effectively than uniform distribution
Solution Approach 2:
The reflection control layer is constructed as a composite structure combining multiple materials with different liquid repellent properties and concentrations. This composite approach creates a multi-functional layer that provides both optical absorption and enhanced liquid repellency, improving long-term durability through material diversity
4Reliability
If a single wavelength band is targeted for absorption, then the structure is simple, but it cannot improve display quality across the full spectrum
Solution Approach 1:
The reflection control structure is segmented into multiple layers, each optimized to absorb different non-emission wavelength bands. The first layer targets one spectral range while the second layer targets another, collectively covering a broader portion of the non-emission spectrum. This segmentation enables comprehensive spectral management without requiring an overly complex single-layer design
Solution Approach 2:
The multi-layer reflection control structure serves multiple functions simultaneously: it absorbs different non-emission wavelength bands, provides liquid repellency, and maintains structural stability. Each layer contributes to different aspects of display quality improvement, making the overall structure universally beneficial across multiple performance dimensions
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 enhances display quality by selectively absorbing light in non-emission wavelength bands, reducing external light reflectance and improving color accuracy, while ensuring structural reliability and long-term stability through the use of a liquid repellent material and a protective film.
Implementation Method 1
the reflection control layer selectively absorbs light in a wavelength band
Implementation Method 2
the second layer includes a liquid repellent material
Implementation Method 3
light reflected by the low reflection inorganic layer and light reflected by the second electrode may destructively interfere with each other
Data Source
AI summary
A display device includes sub-pixels corresponding to sub-pixel areas. Each of the sub-pixels includes a display unit including a light-emitting layer which emits light, and a reflection control layer disposed over the sub-pixel areas on the display unit, where the reflection control layer selectively absorbs light in a wavelength band. The reflection control layer includes a first layer and a second layer disposed on the first layer, where the second layer has a thickness less than a thickness of the first layer. The second layer includes a liquid repellent material.