Polarized Light Modulation Element for Head-Up Display Temperature Control
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Solution Overview
Problem
Head-up display devices experience degradation in display quality due to temperature increases caused by external light, particularly from the sun, which can lead to phase transitions in liquid crystal display panels, resulting in display abnormalities.
Innovation Solution
Incorporation of a polarized light modulation element, such as a liquid crystal lens, between the display panel and the magnification mirror to diffuse external light, reducing the amount of converging light that reaches the display panel and minimizing temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a head-up display device is used, then information can be provided to the driver, but display quality degrades due to temperature increases from external light
Solution Approach 1:
A polarized light modulation element is introduced as an intermediary component between the display panel and the external environment. This element selectively modulates polarized light to reduce the amount of external light reaching the display panel, thereby controlling temperature increase while maintaining display functionality
Solution Approach 2:
The invention changes the optical parameters of the system by introducing polarized light modulation. By controlling the polarization state of light and using polarizing filters at specific angles, the system reduces the intensity of external light reaching the display panel,ไป่ controlling temperature rise
2Illumination intensity
If external light reaches the display panel, then the display panel can be illuminated, but phase transitions occur causing display abnormalities
Solution Approach 1:
The polarized light modulation element acts as an intermediary that selectively filters external light based on its polarization state. This allows controlled illumination of the display panel while preventing excessive light intensity that would cause liquid crystal phase transitions
Solution Approach 2:
The invention converts the harmful effect of external light (which causes temperature rise and phase transitions) into a beneficial effect by using the same external light as a source for polarized light modulation. The polarizing filters convert unpolarized or randomly polarized external light into controlled polarized light patterns that can be managed by the display system
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 suppresses temperature increases in the display panel, preventing phase transitions and maintaining display quality by diffusing external light, thereby ensuring stable image projection on vehicle windshields.
Implementation Method 1
a polarized light modulation element which transmits the image light from the display panel and diffuses external light
Implementation Method 2
diffuses external light, reducing the amount of converging light that reaches the display panel
Data Source
AI summary
According to one embodiment, a display device includes an illumination device, a display panel modulating light from the illumination device and emitting image light, a polarized light modulation element transmitting the image light from the display panel and diffusing external light, and a magnification mirror magnifying an image by the image light transmitted through the polarized light modulation element. The polarized light modulation element is a liquid crystal lens including a first substrate, a second substrate, a liquid crystal layer held between the first substrate and the second substrate, and a first control electrode and a second control electrode applying voltage to the liquid crystal layer.