Tilted Prism Sheet Head-Up Display Image Clarity
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Solution Overview
Problem
Existing head-up display devices suffer from reduced visibility of virtual images due to overlapping reflected external light, which affects the clarity and contrast of the projected images.
Innovation Solution
A head-up display configuration that includes a tilted liquid crystal panel and prism sheet, where the prism sheet is oriented relative to the liquid crystal panel to refract light and prevent overlapping of reflected external light with the virtual image, using specific tilt angles to minimize reflection and maintain image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a prism sheet is used to refract light in a head-up display, then light transmission and image projection are improved, but external light reflection overlaps with the virtual image and reduces visibility
Solution Approach 1:
The prism sheet is tilted at a specific angle (5-15 degrees) relative to the liquid crystal panel, creating an asymmetric configuration that causes reflected external light to diverge at different angles rather than reflecting uniformly back toward the viewer. This asymmetric tilt ensures that reflected light does not overlap with the virtual image, maintaining image visibility while preserving the light refracting function of the prism sheet.
Solution Approach 2:
The solution introduces a new dimensional parameter - the tilt angle of the prism sheet - which was not present in the conventional flat configuration. By adding this angular dimension to the optical path design, the system separates the reflected light from the virtual image in the angular domain, effectively solving the overlap problem while maintaining the one-dimensional light transmission function.
2Reliability
If the prism sheet is tilted to reduce reflected light overlap, then visibility is improved, but the structural complexity of the display device increases
Solution Approach 1:
The invention changes a key physical parameter - the orientation angle of the prism sheet - from the conventional 0-degree (flat) position to a tilted position of 5-15 degrees. This parameter change fundamentally alters the light reflection characteristics without requiring additional components or complex mechanisms, thereby improving reliability while keeping the structural complexity increase minimal and manageable.
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 inhibits the deterioration of virtual image visibility by controlling the tilt angles of the liquid crystal panel and prism sheet, ensuring reduced luminance loss and improved contrast, even under external light conditions.
Implementation Method 1
a liquid crystal panel that is configured to transmit light emitted from the light source and projects an image
Implementation Method 2
a prism sheet that is tilted with respect to a plate surface of the liquid crystal panel and configured to refract light transmitted through the liquid crystal panel
Data Source
AI summary
According to an aspect, a head-up display includes: a light source; a liquid crystal panel that is configured to transmit light emitted from the light source and projects an image; and a prism sheet that is tilted with respect to a plate surface of the liquid crystal panel and configured to refract light transmitted through the liquid crystal panel.