Vehicle Head-Up Display Radiator for Thermal Dissipation
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Solution Overview
Problem
Head-up displays in motor vehicles face excessive heating issues due to light absorption by the backlit screen, which can lead to altered or damaged functionality beyond a critical temperature, despite the use of optical conduits to confine and manage heat.
Innovation Solution
Incorporating a passive radiator between the backlit screen's frame and optical conduit, with ends extending outside to facilitate thermal heat dissipation, thereby reducing heat accumulation and preventing overheating while maintaining the protective benefits of the optical conduit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical conduit is used to confine light and protect against parasitic shadows, then the quality of the virtual image is improved, but thermal heat is confined causing excessive heating of the backlit screen
Solution Approach 1:
The optical conduit is segmented into two separate conduits: an upstream optical conduit that confines light from the source to the screen, and a downstream optical conduit that confines light from the screen to the reflective blade. This segmentation allows independent thermal management at different locations, preventing heat accumulation in the screen area while maintaining optical protection where needed.
Solution Approach 2:
A radiator is introduced as an intermediary component between the backlit screen and the optical conduit. This radiator acts as a thermal mediator that conducts heat away from the screen and dissipates it to the surrounding environment, thereby decoupling the optical confinement function from the thermal management function.
2Reliability
If the backlit screen absorbs light to form the virtual image, then the display functionality is achieved, but thermal heat accumulates causing damage beyond critical temperature
Solution Approach 1:
The radiator serves as a thermal intermediary between the backlit screen and the environment. It conducts excess heat away from the screen through direct thermal contact and dissipates it to the surrounding air, thereby protecting the screen from thermal damage while allowing continuous display operation.
Solution Approach 2:
The system changes the thermal parameters of the backlit screen by introducing a radiator that actively manages heat dissipation. This parameter change ensures the screen temperature remains below the critical damage threshold even during continuous operation at full brightness.
3Reliability
If the optical conduit confines thermal heat, then light protection is maintained, but the backlit screen heats up more quickly
Solution Approach 1:
The optical system is divided into separate upstream and downstream conduits, allowing the upstream conduit to focus on light protection while the radiator handles thermal management. This segmentation enables optimized performance for each function without compromise.
Solution Approach 2:
The radiator is positioned as a thermal intermediary between the backlit screen and the optical conduit, preventing direct thermal coupling. This allows the optical conduit to maintain light confinement effectiveness while the radiator independently manages heat dissipation to the environment.
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
Significantly reduces thermal heat diffusion to the backlit screen, preventing excessive heating and ensuring prolonged functionality by effectively dissipating heat outside the optical conduit, thus preserving the screen's operation beyond its critical temperature.
Implementation Method 1
the radiator comprising at least one end extending outside the optical conduit so as to promote the dissipation of thermal heat from the frame outside the optical conduit
Implementation Method 2
the presence of the radiator thus makes it possible to significantly reduce the quantity of thermal heat diffused by the backlit screen
Implementation Method 3
The absorption of part of the light by the backlit screen causes it to heat up
Data Source
Figure 1~3
Figure 4~6
AI summary
The invention relates to a head-up display (2) for a motor vehicle, comprising a radiator (26) for cooling a backlit screen (10). A head-up display (2) according to the invention comprises a backlit screen (12) having a frame (121) surrounding a matrix (122) made up of elements whose transmittance varies in a controlled manner over time, and an optical duct arranged opposite the matrix (122). The display is notable in that it comprises a radiator (26) interposed between the frame (121) and the optical duct, comprising a window (30) allowing the passage of a light beam between the matrix and the optical duct, the radiator (26) having at least one end (36) extending outside the optical duct so as to promote the dissipation of thermal heat from the frame (121) outside the optical duct.