Display Device Light Guide Structure for Uniform Color Mixing
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Solution Overview
Problem
Existing liquid crystal display devices, particularly those used in head-mounted displays, face challenges in achieving both reduced size and improved display quality, such as non-uniformity in luminance and color, and require efficient light mixing and distribution.
Innovation Solution
The display device incorporates a configuration with a first light guide, a second light guide, a transparent element, and a reflective element, where the transparent element's width and inclination optimize light guidance, and the light sources emit linearly polarized laser beams to enhance light mixing and distribution, reducing device size while improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the device size is reduced for head-mounted display, then the portability and wearability are improved, but the light mixing and distribution becomes insufficient causing non-uniformity in luminance and color
Solution Approach 1:
The illumination device is divided into multiple independent light sources (first light source, second light source, third light source) with different colors (red, green, blue). Each light source has its own light guide and optical path, allowing independent control and optimization of light distribution for each color channel, thereby achieving uniform luminance and color distribution even in a compact device structure.
Solution Approach 2:
The patent introduces a reflective element that redirects light from the light guides in a different spatial dimension. The light guides are arranged in a specific configuration with the reflective element positioned to bounce light at angled orientations, adding a dimensional transformation to the light path and enabling better light distribution across the display panel within a reduced device volume.
2Adaptability or versatility
If multiple light sources of different colors are used, then the color display quality is improved, but the device complexity and light path management becomes more difficult
Solution Approach 1:
Multiple light sources of different colors (red, green, blue laser beams) are combined and guided through a shared optical system. The light guides and reflective element serve common purposes for all color channels, merging the light path management functions. This approach maintains color display quality while reducing overall device complexity compared to having separate optical paths for each color.
Solution Approach 2:
The reflective element acts as an intermediary component that mediates between the multiple light sources and the display panel. It receives light from different colored light guides and redirects it to appropriate positions on the display panel, simplifying the light path management by using a single intermediary component to handle multiple color channels.
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 effectively mixes and distributes light beams, reducing non-uniformity in luminance and color, thereby enhancing display quality and minimizing device size.
Implementation Method 1
a first light guide which has a first side surface facing the light sources, and a second side surface on a side opposite to the first side surface, a second light guide which faces the first light guide
Implementation Method 2
a transparent element which has a first plane being in contact with the second side surface and the third side surface, and a second plane located on a side opposite to the first plane and inclining with respect to the first plane
Implementation Method 3
a reflective element which faces the second plane
Implementation Method 4
a liquid crystal panel
Data Source
AI summary
According to one embodiment, a display device includes a liquid crystal panel, an illumination device, and an optical sheet provided between the liquid crystal panel and the illumination device. The illumination device includes a plurality of light sources, a first light guide which has a first side surface facing the light sources, and a second side surface on a side opposite to the first side surface, a second light guide which faces the first light guide and has a third side surface, a transparent element which has a first plane being in contact with the second side surface and the third side surface, and a second plane located on a side opposite to the first plane and inclining with respect to the first plane, and a reflective element which faces the second plane.