Color Filter Display Structure for Low Ambient Light Reflection
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Solution Overview
Problem
In highly illuminated environments, ambient light reflected by display devices increases the brightness of dark states, leading to low contrast due to ineffective management of light reflection.
Innovation Solution
A display device design incorporating a substrate with light-emitting units, color filter units, and a protecting layer, where the color filter units are strategically positioned to absorb ambient light, and the protecting layer's refractive index and dimensions are optimized to reduce reflected light while maintaining light extraction efficiency, adhering to the condition 2*tan{sin-1[sin(θ2)n1]}*(HCF+H)+WL≤WCF≤12*P.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional display structure is used, then the device is simple to manufacture, but ambient light reflection increases brightness of dark states and reduces contrast
Solution Approach 1:
The patent applies the color filter unit to convert harmful ambient light reflection into beneficial light absorption. The color filter unit is designed to absorb ambient light at specific wavelengths, transforming the harmful reflective effect into a beneficial absorption effect that improves contrast in high illumination environments.
Solution Approach 2:
The patent changes the optical parameters of the display structure by introducing a color filter unit with specific optical properties (absorption characteristics) and optimizing the air gap thickness parameter. This parameter change enables the system to control ambient light reflection and improve contrast while maintaining manufacturing feasibility.
2Object-affected harmful factors
If the color filter unit is positioned closer to the light-emitting unit, then ambient light absorption is improved, but light extraction efficiency may be compromised
Solution Approach 1:
The patent optimizes the air gap thickness parameter between the color filter unit and light-emitting unit to achieve the best balance. By carefully controlling this parameter, the design maximizes ambient light absorption while preserving light extraction efficiency, resolving the contradiction between these two opposing requirements.
Solution Approach 2:
The color filter unit is strategically positioned to create local optical properties that differ from the bulk structure. The air gap creates a localized region with specific optical characteristics that enhance ambient light absorption without significantly impacting the overall light extraction efficiency of the display device.
3Object-affected harmful factors
If the color filter unit width is increased to reduce reflection, then manufacturing complexity increases due to precise width control requirements
Solution Approach 1:
The patent establishes a specific width range for the color filter unit (WCF) that balances reflection reduction with manufacturing feasibility. By defining this parameter within a practical range, the design achieves effective ambient light management without imposing excessive manufacturing complexity.
Solution Approach 2:
The color filter unit width is designed to be sufficient to reduce ambient light reflection effectively, but not excessively large. This partial action approach achieves the necessary reflection reduction while maintaining reasonable manufacturing complexity and device integration.
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
This design effectively reduces ambient light reflection, enhancing the contrast of the display device while preserving light extraction efficiency.
Implementation Method 1
the color filter units are strategically positioned to absorb ambient light
Implementation Method 2
the protecting layer's refractive index and dimensions are optimized to reduce reflected light
Data Source
AI summary
A display device includes a substrate, a plurality of light-emitting units, a plurality of color filter units and a protecting layer. The plurality of color filter units are disposed on the plurality of light-emitting units and include a first color filter unit. The first color filter unit is overlapped with a first light-emitting unit of the plurality of light-emitting units. The protecting layer is arranged on the plurality of color filter units. The display device has a maximum light-emitting angle θ2, the protecting layer has a refractive index n1, the first color filter unit has a width WCF along a first direction, the light-emitting layer of the first light-emitting unit has a width WL along the first direction, and the first color filter unit has a thickness HCF, a distance H is formed between the first light-emitting unit and the first color filter unit.