Display Device Lens Layer Refractive Index Optimization
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Solution Overview
Problem
Display devices with color filters face limitations in enhancing visual field angle characteristics and radiation angle, as existing technologies do not effectively increase these parameters without compromising image quality or causing color shifts.
Innovation Solution
The display device incorporates a substrate with a lens layer having a higher refractive index than the light-transmitting layer, where the lens is positioned corresponding to the pixel electrode and the color filter, allowing for increased radiation angle by refracting light closer to the inside of the transmissive substrate and expanding the visual field angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a color filter is added to improve color display quality, then color purity is improved, but the radiation angle decreases
Solution Approach 1:
The patent divides the optical path into multiple functional layers: a first optical layer containing the color filter close to the viewer, and a second optical layer containing the light-emitting layer farther from the viewer. This segmentation allows the color filter to be positioned optimally for color purity while the overall microlens structure manages light distribution to maintain radiation angle.
Solution Approach 2:
The patent introduces a vertical dimension to the optical design by positioning the color filter and microlens at different distances from the viewer along the optical axis. The color filter is placed closer to the viewer while the light-emitting layer is positioned farther away, creating a three-dimensional optical path that resolves the trade-off between color purity and radiation angle.
2Adaptability or versatility
If the microlens focal length is shortened to increase radiation angle, then viewing range is improved, but color shifts occur
Solution Approach 1:
The patent applies different optical properties to different parts of the system: the microlens has specific refractive index and curvature optimized for light extraction, while the color filter has spectral transmission characteristics optimized for color purity. Each component is locally optimized for its specific function rather than trying to make a single component perform all functions.
Solution Approach 2:
The patent introduces an intermediary optical arrangement where the color filter is positioned between the microlens and the viewer, acting as a mediator that receives light from the microlens and applies color filtering. This intermediary position allows the microlens to optimize for radiation angle while the color filter optimizes for color purity without direct interference between their functions.
3Adaptability or versatility
If a light-transmitting layer with lower refractive index is added to increase radiation angle, then viewing angle is improved, but light utilization efficiency decreases
Solution Approach 1:
The patent carefully selects and optimizes the refractive index parameter of the light-transmitting layer to be lower than the microlens material but higher than air. This parameter optimization ensures that the layer provides the necessary refraction to increase radiation angle while minimizing reflection losses and maintaining high light transmission efficiency.
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 configuration enhances the visual field angle characteristic and image quality by increasing the radiation angle, allowing for a wider viewing range without image quality degradation, such as color shifts, and improves light utilization efficiency.
Implementation Method 1
a refractive index of a constituent material for the lens is higher than a refractive index of a constituent material for the light-transmitting layer
Data Source
AI summary
A display device is provided that includes a substrate, a lens layer including a lens, a light-transmitting layer contacting a lens surface of the lens and having translucency, a pixel electrode disposed between the substrate and the lens layer, and a color filter disposed between the pixel electrode and the lens layer. The lens is disposed correspondingly to the pixel electrode. A refractive index of a constituent material for the lens is higher than a refractive index of a constituent material for the light-transmitting layer.