Virtual Image Display Mirror Layout for Distortion Suppression
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Solution Overview
Problem
Existing virtual image display apparatuses face challenges in removing distortion, particularly trapezoidal distortion, which necessitates electrical correction, increasing circuit size and power consumption.
Innovation Solution
The apparatus employs a non-coaxial optical system with specific mirror configurations, including a first mirror and a second mirror, where the distance from the imaging light emitting unit to the first mirror is shorter than to the second mirror, and the angle between incident and reflected imaging light at the second mirror is greater than 0° and 45° or less, reducing the need for circuit correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrical correction is used to remove distortion, then distortion is corrected, but circuit size and power consumption increase
Solution Approach 1:
The patent replaces the electrical correction system (software/digital processing) with a mechanically optimized optical system. By carefully designing the mirror arrangements, distances, and angles, the optical system inherently minimizes distortion aberration, eliminating or reducing the need for complex electrical correction circuits.
Solution Approach 2:
The patent extracts and removes the distortion correction function from the electrical domain and transfers it to the optical domain through precise mechanical design of the mirror system, thereby eliminating the need for additional correction circuits and reducing overall system complexity.
2Manufacturing precision
If electrical correction is used to remove distortion, then distortion is corrected, but power consumption increases
Solution Approach 1:
The patent substitutes the energy-consuming electrical correction process with a passive optical design. The distortion correction is achieved through the physical arrangement of optical components rather than active electrical processing, thereby reducing power consumption.
Solution Approach 2:
The optical system is designed to self-correct distortion through its inherent geometric configuration. The mirror distances and angles are optimized so that the system automatically minimizes distortion aberration without requiring additional energy input for correction.
3Manufacturing precision
If mirror distances and angles are optimized, then distortion aberration is suppressed, but optical system complexity increases
Solution Approach 1:
The patent optimizes specific parameters of the optical system (mirror distances, angles, and positions) to achieve distortion suppression. By carefully selecting and adjusting these geometric parameters, the system achieves low distortion while maintaining a relatively simple optical configuration.
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 suppresses distortion aberration, allowing for high-accuracy image formation without requiring electrical correction, thus minimizing circuit size and power consumption.
Implementation Method 1
a first mirror that reflects the imaging light from the imaging light emitting unit
Implementation Method 2
an optical member that includes a reflecting portion reflecting the imaging light reflected by the first mirror
Implementation Method 3
a second mirror that reflects the imaging light reflected by the reflecting portion toward a position of an exit pupil
Data Source
AI summary
Provided is a virtual image display apparatus including a display device configured to emit an imaging light; a first mirror configured to reflect the imaging light from the display device; a refractive reflective optical member including a mirror portion configured to reflect the imaging light reflected by the first mirror; and a second mirror configured to reflect the imaging light reflected by the mirror portion toward a position of an exit pupil, wherein a distance from the display device to the first mirror is shorter than a distance from the position of the exit pupil to the second mirror; and a first angle θ formed by the imaging light incident on the second mirror and the imaging light reflected by the second mirror is greater than 0° and 45° or less.