Head-Up Display Phase Element for Polarization and Luminance Control
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Solution Overview
Problem
The display light in head-up displays is affected by the arrangement of optical elements, leading to unintended polarization and luminance reduction when passing through or being reflected by mirrors, a translucent dust cover, and a windshield, resulting in suboptimal display quality.
Innovation Solution
A head-up display design incorporating a phase element with multiple phase difference plates having different polarization characteristics, disposed at a predetermined inclination relative to the principal ray of the display light, to mitigate the adverse effects on display quality by optimizing the propagation characteristics and polarizing characteristics of the light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If display light passes through multiple optical elements (reflecting mirrors, translucent dust cover, windshield), then the head-up display can be implemented with basic optical path, but unintended polarization and luminance reduction occur
Solution Approach 1:
A phase element is introduced as an intermediary component between the display element and the optical elements. This phase element includes a plurality of phase difference plates with different polarization characteristics that actively compensate for the polarization changes and luminance reduction caused by the optical elements (reflecting mirrors, translucent dust cover, windshield), thereby maintaining display quality while preserving the basic optical path structure
2Ease of manufacture
If display light passes through multiple optical elements (reflecting mirrors, translucent dust cover, windshield), then the head-up display can be implemented with basic optical path, but unintended polarization occurs
Solution Approach 1:
A phase element is introduced as an intermediary component between the display element and the optical elements. This phase element includes a plurality of phase difference plates with different polarization characteristics that actively compensate for the polarization changes caused by the optical elements (reflecting mirrors, translucent dust cover, windshield), thereby maintaining display quality while preserving the basic optical path structure
Solution Approach 2:
The phase difference plates in the phase element utilize the polarization changes caused by optical elements and convert this harmful effect into a beneficial one by compensating for the polarization shifts. The phase difference plates are specifically designed to counteract the unintended polarization introduced by mirrors, dust covers, and windshields, transforming the harmful polarization effect into improved display performance
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 enhances the display quality of the virtual image by canceling out adverse effects caused by the optical elements, resulting in improved luminance and polarization efficiency.
Implementation Method 1
a phase element 2 that includes a plurality of phase difference plates 21 to 23 having different polarization characteristics
Implementation Method 2
display light emitted from a liquid crystal display is reflected by a plurality of reflecting mirrors
Implementation Method 3
passes through a translucent dust cover 33 that covers an emission port
Data Source
AI summary
A head-up display includes a display element that emits display light indicating vehicle information, a case that accommodates the display element and has an emission port from which the display light is emitted to the outside, an optical element including a translucent dust cover that covers the emission port, and a phase element that is constituted from a plurality of phase difference plates having different polarization characteristics and is disposed at a prescribed inclination with respect to the principal ray of the display light. The phase element is designed by a first step for setting a light propagation characteristic of the optical element, and a second step for setting a target value of emission light of the optical element and calculating the polarization characteristics of each of the plurality of phase difference plates and the inclination serving as an approximate solution for the target value.