Head-Mounted Display Thermal Paths for Brightness and Temperature Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
AR glasses face challenges in maintaining surface temperature below 39 degrees for user comfort and ensuring sufficient brightness under varying usage conditions, particularly during extreme image brightness levels or low workload scenarios, due to limited power handling and heat dissipation through natural convection.
Innovation Solution
A head-mounted display design incorporating multiple display panels connected via thermally conductive material layers, with a control module adjusting light intensity based on ambient brightness to manage surface temperature, using thermally conductive materials and sensors to dissipate heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If natural convection of airflow is used for heat dissipation to maintain lightweight design, then the AR glasses remain lightweight and simple, but the power handling capability is very limited and surface temperature cannot be controlled under extreme conditions
Solution Approach 1:
The heat dissipation system is segmented into multiple thermal conduction paths through separate thermally conductive material layers (first and second thermally conductive material layers) that independently conduct heat from different components (display panels and control module) to the casing, enabling distributed heat management without increasing overall system weight
Solution Approach 2:
Thermally conductive material layers are introduced as intermediary substances between the heat-generating components (display panels and control module) and the casing to facilitate efficient heat transfer. These material layers act as thermal mediators that conduct heat away from sensitive components while maintaining the lightweight structure
2Illumination intensity
If light intensity is increased to ensure sufficient brightness, then image quality improves, but surface temperature exceeds the comfortable threshold for skin contact
Solution Approach 1:
A feedback control mechanism is implemented where the control module monitors ambient light conditions and adjusts the light intensity of the display panels accordingly. The control module determines whether the ambient light brightness value exceeds a threshold and相应地 adjusts the light intensity, preventing excessive heat generation while maintaining sufficient brightness for image quality
Solution Approach 2:
The system dynamically changes the light intensity parameter of the display panels based on ambient light conditions. By adjusting this parameter, the system optimizes the balance between brightness (image quality) and heat generation (surface temperature), ensuring comfortable wearing conditions while maintaining adequate display performance
3Temperature
If power consumption is reduced to maintain temperature below 39 degrees, then surface temperature remains comfortable for skin contact, but brightness may be underestimated under low workload conditions
Solution Approach 1:
The light intensity of the display panels is made dynamic rather than static. The control module continuously monitors ambient light conditions and adjusts the light intensity in real-time based on whether the ambient brightness exceeds a predetermined threshold. This dynamic adjustment allows the system to optimize brightness for each working condition while managing power consumption and surface temperature
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
Maintains image quality and brightness while adhering to temperature regulations, enhancing user experience by effectively dissipating heat and adjusting light intensity to prevent overheating.
Implementation Method 1
The first display panel, the second display panel, and the third display panel are connected to the casing through the first thermally conductive material layer
Implementation Method 2
The first display panel, the second display panel, and the third display panel are connected to the casing through the first thermally conductive material layer, and are configured to emit a first image beam, a second image beam, and a third image beam respectively
Implementation Method 3
The first image beam, the second image beam, and the third image beam are projected out of the head-mounted display through the projection optical engine and the imaging lens
Data Source
AI summary
A head-mounted display includes a casing, a first display panel, a second display panel, a third display panel, a projection optical engine, a first thermally conductive material layer, a control module, and an imaging lens. The first display panel, the second display panel, the third display panel, and the control module are disposed in the casing. The imaging lens is disposed on the casing. The first display panel, the second display panel, and the third display panel are configured to emit image beam respectively. The control module is electrically connected to the first display panel, the second display panel, and the third display panel to adjust light intensity of the image beam respectively according to a brightness value of ambient light to adjust a surface temperature of the casing. A light intensity adjustment method of the head-mounted display is further disclosed.