Light Guide Mirrors with Variable Reflectance for Uniform Image Quality
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Solution Overview
Problem
Existing display apparatuses using light guide plates suffer from significant light loss due to inefficient light distribution and reflection, resulting in non-uniform image quality and reduced light quantity reaching the viewer's eye.
Innovation Solution
A display apparatus is designed with a light guide element comprising a first and second light guide part, where the first light guide part includes a plurality of mirrors with different reflection regions to guide light from a display element, optimizing light propagation and reflection to minimize light loss and enhance image quality by using a combination of half mirrors and high-reflectance mirrors in the horizontal and vertical mirror sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light guide plate with mirrors is used to guide light from a display element, then light can be directed to the viewer's eye, but significant light loss occurs due to inefficient light distribution and reflection
Solution Approach 1:
The patent applies local quality by dividing the mirror surfaces into multiple regions with different reflectance characteristics. Specifically, each mirror includes a first reflection region with lower reflectance and a second reflection region with higher reflectance. This localized differentiation optimizes light distribution by allowing certain regions to transmit more light while others reflect more, thereby reducing overall light loss in the light guide plate system.
Solution Approach 2:
The patent implements parameter changes by varying the reflectance parameters of different mirror regions. The first reflection region has a lower reflectance parameter while the second reflection region has a higher reflectance parameter. This parameter differentiation enables optimized light control, reducing light loss while maintaining efficient light guidance to the viewer's eye.
2Manufacturing precision
If mirrors with uniform reflectance are used in the light guide plate, then the structure is simple, but non-uniform image quality results due to inefficient light distribution
Solution Approach 1:
The patent resolves this contradiction by applying local quality through non-uniform mirror design. Each mirror is divided into first and second reflection regions with different reflectance characteristics. This localized variation in mirror properties achieves uniform light distribution across the display, improving image quality uniformity while maintaining a relatively simple overall mirror structure that can be manufactured using conventional techniques.
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 solution significantly reduces light loss and improves image quality by ensuring uniform light distribution and increased reflectance, allowing for a higher-quality image display with reduced gaps in the light quantity, thus enhancing the viewer's experience.
Implementation Method 1
The first light guide part has a plurality of mirrors disposed along the first direction and configured to guide the light to the second light guide part by reflecting the light
Data Source
AI summary
A display apparatus includes a guide element, and an incident optical system causing light from a display element to enter the guide element. The guide element includes a first light guide part guiding the light from the incident optical system in a first direction and a second light guide part guiding the light from the first light guide part in a second direction intersecting with the first direction. The first light guide part has mirrors disposed along the first direction and guiding the light to the second light guide part by reflection. The mirrors include a first mirror and a second mirror. Each of the first and second mirrors has a first reflection region and a second reflection region having a higher reflectance than the first reflection region. Light having transmitted through the first reflection region of the first mirror enters the second reflection region of the second mirror.