Display Panel Color Filter Structure to Reduce External Reflectivity
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Solution Overview
Problem
Existing display panels face challenges in reducing external light reflectivity and enhancing visual perception, particularly in compact and slender electronic devices.
Innovation Solution
Incorporation of a color filter layer with a black matrix, color resists, and an index matching film, along with optional anti-reflection and anti-smudge layers, to manage light reflection and improve visual clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional color filter layer structure is used, then the display panel structure is simple, but the external light reflectivity is high and visual perception is poor
Solution Approach 1:
The color filter layer is divided into multiple functional sub-layers: a first color resist layer adjacent to the light emitting unit, a black matrix layer for light shielding, and a second color resist layer adjacent to the second substrate. This segmentation allows each layer to be optimized for its specific function, reducing overall reflectivity while maintaining structural organization.
Solution Approach 2:
An index matching film is introduced as an intermediary layer between the second substrate and the color filter layer. This film has a refractive index that is higher than the second substrate and lower than the black matrix, serving as an optical mediator to reduce reflectivity at the interface between the substrate and color filter layer.
2Object-affected harmful factors
If the refractive index difference between layers is large, then light transmission is blocked, but if the refractive index difference is small, then reflectivity is reduced
Solution Approach 1:
The refractive index parameter of the index matching film is specifically controlled to fall between the refractive indices of the second substrate and the black matrix. This parameter optimization creates a gradual refractive index transition, reducing the abrupt changes that cause reflection while maintaining adequate light transmission through the color filter layer.
3Ease of operation
If anti-reflection and anti-smudge layers are added, then visual perception is enhanced, but the device structure becomes more complex
Solution Approach 1:
The index matching film serves multiple functions simultaneously: it acts as an anti-reflection layer by reducing reflectivity at the substrate-color filter interface, and as an anti-smudge layer by providing a low surface energy coating that resists fingerprints and smudges. This multi-functionality enhances visual perception without requiring separate dedicated layers for each function.
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
Reduces external light reflectivity, enhances panel transmittance, and improves visual perception by minimizing glare and power consumption.
Implementation Method 1
A refractive index of the IMF ranges from a refractive index of the second substrate to a refractive index of the black matrix
Implementation Method 2
One portion of the black matrix is disposed between the first color resist and the second color resist
Data Source
AI summary
A display panel including a first substrate, a second substrate, a plurality of light emitting units, and a color filter layer is provided. The second substrate is disposed opposite to the first substrate. The second substrate includes a first surface and a second surface. The light emitting units are disposed on the first substrate. The color filter layer is disposed between the light emitting units and the second substrate. The color filter layer includes a black matrix, a first color resist, and a second color resist. The black matrix is disposed on the first color resist. One portion of the black matrix is disposed between the first color resist and the second color resist. The display panel provided in the disclosure is capable of reducing the reflectivity of external light or enhancing visual perception.