Light Guide Element Mirror Configuration for Beam Expansion
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Solution Overview
Problem
Existing display apparatuses using light guide plates struggle to expand beam width in two-dimensional directions while minimizing light quantity loss, as previous configurations either result in significant light loss or uneven light distribution.
Innovation Solution
A display apparatus comprising a light guide element with a first and second light guide part, where the second light guide part has a mirror set to reflect light in a third direction intersecting with the first and second directions, and an incident optical system that enters light from a display element obliquely to reduce reflection losses and enhance light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a mirror set is disposed on a planar substrate to expand beam width in two-dimensional directions, then beam width is increased, but light quantity loss increases
Solution Approach 1:
The patent transitions from one-dimensional beam expansion (using mirrors in a single plane) to two-dimensional beam expansion by introducing a second set of mirrors arranged perpendicular to the first set. This allows the beam to be expanded in both horizontal and vertical directions simultaneously, achieving comprehensive beam width increase while maintaining optical efficiency through proper geometric arrangement.
Solution Approach 2:
The mirror system is divided into two independent mirror sets: a first mirror set for expanding the beam in a first direction, and a second mirror set for expanding the beam in a second direction perpendicular to the first. This segmentation allows each mirror set to be optimized independently for its specific directional expansion task, reducing overall light loss compared to a single complex mirror system.
2Loss of energy
If light enters the light guide element obliquely to reduce reflection losses, then light quantity loss is reduced, but optical system complexity increases
Solution Approach 1:
The patent optimizes the incident angle of light entering the light guide element to be within a specific range (30-60 degrees relative to the normal). By changing this angular parameter, the system achieves reduced reflection losses at the air-glass interface while maintaining a relatively simple optical structure. The oblique incidence angle is carefully selected to balance anti-reflection performance with structural simplicity.
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 effectively expands beam width in two-dimensional directions with reduced light quantity loss, ensuring uniform light distribution and improved image display quality by optimizing the placement and configuration of mirrors within the light guide plate.
Implementation Method 1
The first light guide part has a first reflection surface facing the first mirror set. The second light guide part has a second reflection surface facing the second mirror set.
Implementation Method 2
The second light guide part has a second mirror set configured to output the light in a third direction from the light guide element by reflecting the light.
Implementation Method 3
A display apparatus using a light guide plate guides light emitted from a display element to a viewer's eye with the light guide plate
Data Source
AI summary
A display apparatus includes: a guide element including a first part guiding light from the incident optical system in first direction and a second part guiding the light from the first part in second direction intersecting with the first direction; and an incident optical system. The first part has a first mirrors guiding the light to the second propagation part by reflection. The second part has a second mirror set causing the light to exit in third direction from the light element by reflection. The first part has a first reflection surface facing the first mirrors. The second part has a second reflection surface facing the second mirrors. The incident optical system causes the light coming from the display element to enter the first part obliquely with respect to the second and third directions. The first mirrors are disposed between the first reflection surface and the second part.