Display Panel Tandem Layer for Low Visible-Light Reflectivity
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Solution Overview
Problem
High reflectivity of display panels in bright environments interferes with the displayed image, reducing the effectiveness of the display.
Innovation Solution
A display panel design featuring a tandem layer with alternating first and second sub-layers of varying refractive indices and thicknesses, combined with a light-transmitting conducting layer and a composite polarizing film, to achieve a visible-light reflectivity of less than or equal to 1.1%, enhancing the 'extremely black' effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the display panel uses conventional single-layer anti-reflection coating, then the manufacturing process is simple, but the visible-light reflectivity is high (greater than 1.1%)
Solution Approach 1:
The anti-reflection coating is divided into multiple sub-layers (first sub-layer, second sub-layer, third sub-layer) with different refractive indices and thicknesses. Each sub-layer contributes to reducing reflectivity at different wavelengths and angles, achieving superior anti-reflection performance (visible-light reflectivity ≤ 1.1%) that cannot be achieved with a single layer.
Solution Approach 2:
The patent uses composite material structure with different materials having distinct refractive indices (e.g., silicon nitride with n=2.0, silicon oxide with n=1.46, magnesium fluoride with n=1.38). This composite approach creates a gradient refractive index profile that progressively reduces light reflection across the visible spectrum.
2Object-affected harmful factors
If the display panel uses high-refractive-index materials to reduce reflectivity, then the anti-reflection performance improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes specific parameters including film thicknesses (first sub-layer: 80-120nm, second sub-layer: 150-250nm, third sub-layer: 100-200nm) and refractive indices of each layer. By carefully controlling these parameters, the design achieves effective anti-reflection with relaxed manufacturing tolerances compared to conventional single-layer designs.
Solution Approach 2:
Instead of relying solely on precise control of a single layer thickness, the patent introduces an additional dimension of control by using multiple layers with different thicknesses and refractive indices. This multi-dimensional approach provides more degrees of freedom for optimizing anti-reflection performance while maintaining manufacturing feasibility.
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 design significantly reduces visible-light reflectivity, minimizing image interference from external light and achieving an 'extremely black' display effect.
Implementation Method 1
a refractive index of each of the first sub-layers is greater than a refractive index of each of the second sub-layers; the tandem layer located at a light exiting side of the glass substrate
Implementation Method 2
refracting and scattering external light, minimizing interference from ambient light
Data Source
AI summary
A display panel and a display device are provided by the present application. The display panel includes: a glass substrate, wherein the glass substrate is a substrate at the light exiting side of the display panel; and a tandem layer located at the light exiting side of the glass substrate. The tandem layer includes one or more first sub-layers and one or more second sub-layers, and the first sub-layers and the second sub-layers are arranged alternately. A refractive index of each of the first sub-layers and a refractive index of each of the second sub-layers are unequal. A thickness of each of the first sub-layers is less than a thickness of each of the second sub-layers. A visible-light reflectivity of the display panel is less than or equal to 1.1%. The display panel is used to manufacture low-reflectivity display products.