Light Guide Unit Without Prism Layer for LCD Color Mixing
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Solution Overview
Problem
Liquid crystal display devices face color mixing issues due to light transmission through a liquid crystal layer of one pixel being transmitted to the light emitting layer of an adjacent pixel, leading to degradation in display quality.
Innovation Solution
The display device employs a light guide unit with low birefringence and no intervening prism layer, guiding polarized light from a light source to a light emitting layer without prism sheets, ensuring the light remains parallel and maintaining polarization direction, thus preventing color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional light guide unit with prism layers is used, then light can be effectively guided to the light emitting layer, but color mixing occurs when light from one pixel is transmitted to adjacent pixels through the liquid crystal layer
Solution Approach 1:
The patent removes the prism layer from the light guide unit, extracting the problematic component that causes light to spread between adjacent pixels. This extraction eliminates the source of color mixing while maintaining effective light guidance through the modified light guide structure.
Solution Approach 2:
The patent applies different optical properties to different regions of the light guide unit. By creating a light guide unit with specific refractive index variations and removing prism layers in certain areas, the structure achieves localized light control that prevents color mixing in adjacent pixel regions while maintaining overall light guidance efficiency.
2Use of energy by moving object
If polarized light is used to improve light use efficiency, then energy consumption is reduced, but the light may cause color mixing when transmitted through the liquid crystal layer
Solution Approach 1:
The patent removes the prism layer that causes polarized light to spread between adjacent pixels. By extracting this component, the system maintains the energy efficiency benefits of polarized light while eliminating the color mixing problem that would otherwise occur with conventional light guide structures.
Solution Approach 2:
The patent changes the optical parameters of the light guide unit by removing the prism layer and adjusting the refractive index distribution. This parameter change allows polarized light to maintain its directional properties and energy efficiency while preventing the light from spreading to adjacent pixels and causing color mixing.
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 light use efficiency, reduces energy consumption, and prevents color mixing, resulting in improved display quality with wider color gamut and reduced luminance unevenness.
Implementation Method 1
The light guide unit has a light incident surface and a light extracting surface. The light guide unit guides the light from the light source toward the light emitting layer without any intervening prism layer.
Implementation Method 2
The lens concentrates the light emitted from the light source unit.
Implementation Method 3
the light emitting layer is excited by the light transmitted through the polarizer and emits photoluminescence light
Data Source
AI summary
According to one embodiment, a display device includes a light source unit, a light guide unit, a lens, and a light emitting layer. The light source unit emits light to the light guide unit. The lens concentrates the light emitted from the light source unit. The light guide unit guides the light concentrated by the lens toward the light emitting layer. The light guided by the light guide unit is transmitted to the light emission layer without any intervening prism layer.