Head-Up Display Optical Member Angles for Stereoscopic Effect
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Solution Overview
Problem
Head-up displays (HUDs) face a challenge in achieving a remarkable stereoscopic effect while maintaining the luminance of virtual images, as simple inclination of the liquid crystal panel lowers image brightness.
Innovation Solution
A HUD configuration with a light source, liquid crystal panel, and optical member where the light output surface intersects the optical axis at a first acute angle, and the liquid crystal panel's surface intersects at a second acute angle smaller than the first, utilizing a concave mirror and protruding portions on the optical member to refract light and enhance the stereoscopic effect without reducing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the liquid crystal panel is inclined with respect to the direction perpendicular to the optical axis to achieve a stereoscopic effect, then the stereoscopic effect is enhanced, but the luminance of the virtual image is lowered
Solution Approach 1:
An optical member is introduced as an intermediary component between the liquid crystal panel and the external environment. This optical member refracts light to adjust the angle at which light exits the liquid crystal panel, enabling the panel to be inclined for stereoscopic effect while maintaining luminance through proper light path management
Solution Approach 2:
The invention changes the optical parameters by introducing an optical member with specific refractive properties. By controlling the refractive index and geometry of the optical member, the system achieves the desired inclination angle for stereoscopic effect while compensating for luminance loss through optimized light refraction
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 achieves a more remarkable stereoscopic effect while maintaining higher luminance and contrast of the virtual image compared to traditional HUDs, as demonstrated by measurement results showing improved luminance and contrast ranges.
Implementation Method 1
an optical member configured to refract light that has passed through the liquid crystal panel
Data Source
AI summary
According to an aspect, a head-up display includes: a light source configured to emit light; a liquid crystal panel configured to transmit light from the light source to project an image; and an optical member configured to refract light that has passed through the liquid crystal panel. A light output surface of the light source intersects with an optical axis of output light at a first acute angle, the output light having passed through the optical member. A plate surface of the liquid crystal panel intersects with the optical axis of the output light at a second acute angle. The second acute angle is smaller than the first acute angle.