Additional Polarizer for Head-Up Display Heat Management
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Solution Overview
Problem
High light power emitted to liquid crystal screens causes significant heating due to absorption in the input polarizer, disrupting the screen's operation and limiting the generation of bright images.
Innovation Solution
An additional polarizer is interposed between the light source and the liquid crystal screen, absorbing light components with different polarizations and reducing heat absorption by the screen, while the additional polarizer itself handles the heat through thermal connections and heat evacuation means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high light power is emitted by the light source to illuminate the liquid crystal screen, then the brightness of the generated image is improved, but the heating of the liquid crystal screen increases which disrupts its operation
Solution Approach 1:
An additional polarizer is introduced as an intermediary element between the light source and the liquid crystal screen. This additional polarizer absorbs the unwanted polarization components of light before they reach the screen's input polarizer, thereby reducing heat generation at the critical location while maintaining sufficient brightness for image generation.
Solution Approach 2:
The invention converts the harmful effect of light absorption (which causes heating) by relocating it from the liquid crystal screen to a dedicated additional polarizer. The additional polarizer is specifically positioned to absorb the unwanted polarization components, transforming the potential harm of heat generation away from the sensitive display elements while still achieving the necessary light filtering function.
2Reliability
If the light power absorbed in the input polarizer is high, then the polarization selection function is effective, but the heating of the screen increases which disrupts operation
Solution Approach 1:
The additional polarizer serves as a protective intermediary that performs the polarization selection function before light reaches the input polarizer of the liquid crystal screen. By handling the absorption of unwanted polarization components in advance, it prevents excessive heating at the screen while ensuring reliable operation through maintained polarization control.
Solution Approach 2:
The additional polarizer performs the polarization filtering action preliminarily, before the light reaches the liquid crystal screen's input polarizer. This preliminary polarization selection reduces the light power that needs to be absorbed by the screen's polarizer, thereby preventing overheating and ensuring stable operation from the outset.
3Temperature
If an additional polarizer is added to the optical path, then the heating of the liquid crystal screen is reduced, but the device complexity increases
Solution Approach 1:
The additional polarizer is strategically positioned in the optical path between the light source and the liquid crystal screen, serving as a dedicated intermediary for heat management. This separate element handles the absorption of unwanted polarization components, protecting the screen from overheating while maintaining a relatively simple overall device structure through functional specialization.
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 limits the heating of the liquid crystal screen, allowing for the generation of very bright images without compromising the screen's operation, and distributes heat sources within the image generation device.
Implementation Method 1
an additional polarizer, interposed on the path of the light between the light source and the liquid crystal screen, this additional polarizer being adapted to transmit said component of the light having said given polarization and to absorb a component of the light having a polarization different from said given polarization
Implementation Method 2
The input polarizer allows to select, in the light which illuminates the liquid crystal screen, a component having a given polarization, rectilinear. The input polarizer is most often an absorption polarizer, that is to say that light incident on this filter, and having a polarization different from that transmitted, is absorbed in the filter.
Implementation Method 3
a liquid crystal matrix (or liquid crystal cell) electrically controlled pixel by pixel
Data Source
Figure 1~3
AI summary
An image generation device (3) includes a liquid crystal display (5) and a light source (6) optically connected to the liquid crystal display (5) to illuminate said display (5); the liquid crystal display (5) includes an input polarizer (20) adapted to selectively transmit a component of light having a given polarization. The image generation device (3) includes an additional polarizer (8) interposed in the path of the light between the light source (6) and the liquid crystal display (5). This additional polarizer (8) is adapted to transmit said component of light having said given polarization and to absorb a component of light having a polarization different from said given polarization. A head-up display comprising such an image generation device is also described.