How to reduce the operating temperature of the LCD screen through external heat
Date:2025-12-19
How to reduce the operating temperature of the LCD screen through external heat dissipation?
Strengthening external heat dissipation is the most direct, controllable, and effective method to reduce the operating temperature of LCD screens. The core idea is to efficiently export and accelerate the dissipation of heat generated inside the screen. The following is the operating plan of the system, from easy to difficult, you can combine and use it according to your actual situation:
Detailed explanation of core methods
1. Optimize the heat conduction path (basic and critical)
This is the foundation of all heat dissipation, with the aim of efficiently transferring heat from the heating point (mainly the driver IC and LED backlight area) to the external environment.
Locate hotspots: First, use an infrared thermal imager or thermometer to find the area with the highest temperature on the screen back panel.
Add heat sinks:
Material: Paste or lock aluminum or copper heat dissipation fins in hotspot areas. Aluminum is low-cost and lightweight; Copper conducts heat faster but is heavier and more expensive.
Tip: The direction of the fins should be parallel to the direction of air flow to increase the effective heat dissipation area.
Using thermal interface materials:
Thermal grease, thermal pads, or thermal phase change materials must be used between the heating components (such as chips) and the heat sink/metal casing. They can fill tiny air gaps that are invisible to the naked eye, greatly improving thermal conductivity efficiency.
Attention: Make sure to apply appropriate pressure to ensure tight contact.
2. Strengthen air convection heat dissipation (passive/active)
Quickly dissipate the heat conducted to the casing or heat sink.
Passive air duct design:
In terms of device structure, design reasonable air inlet and outlet ports for the screen area, and utilize natural convection or air ducts formed by other fans inside the device to dissipate heat.
Avoid trapping hot air: Ensure that there is sufficient space above or behind the screen and that the air vents are not obstructed.
Active forced convection:
This is the most effective method. Install a small DC fan near the screen heat sink or on the air duct.
Key selection points: Pay close attention to air volume (CFM) and wind pressure. The air volume determines the total amount of hot air carried away, while the air pressure determines whether the dense heat dissipation fins can be effectively blown through. It is necessary to balance the selection based on the resistance of the air duct.
3. Adopting an efficient active cooling solution (advanced)
For extreme high temperatures or confined spaces.
Heat pipe technology: One end of the heat pipe is attached to the hot spot on the screen, and the other end is connected to a distant set of heat dissipation fins. It can efficiently transfer heat from a small space to a location that is more conducive to heat dissipation.
Temperature equalizing plate: The principle is similar to a heat pipe, but it is more suitable for flat surfaces with larger areas and dispersed heat sources, such as the entire screen back panel.
4. Utilize thermal radiation (auxiliary means)
Perform anodizing and blackening treatment on the surface of the heat sink or screen metal backplate, or apply a high emissivity coating. This can enhance its infrared radiation capability and also dissipate some heat without relying on air.
Key points of system integration and verification
1. Collaborative design of the entire machine:
Consider incorporating screen heat dissipation into the overall cooling system to prevent the screen from inhaling hot air from other high-temperature components such as the CPU and power supply.
The internal air duct of the whole machine should be clear and free of short circuits to ensure that cold air can flow through the screen.
2. Monitoring and testing:
After the heat dissipation renovation, a long-term aging test must be conducted in the most stringent working environment (such as the highest ambient temperature and full brightness display), and a thermal imaging instrument must be used to verify whether the temperature has truly dropped to the safe range (usually requiring a temperature that is more than 10 ° C lower than the maximum working temperature specified in the screen specification).
3. Reliability considerations:
If a fan is used, its lifespan, noise, dust resistance, and redundancy design should be considered (industrial applications may require dual fan backup).
All additional heat dissipation structures must be firm and reliable to avoid loosening during vibration.
Quick reference for scheme selection
Application scenarios | Recommended combination plan | key objective |
Ordinary industrial equipment, stable rise not high | Thermal pad+aluminum heat sink+optimized air duct | Cost priority, passive heat dissipation |
Outdoor terminals or enclosed spaces | Thermal conductive silicone grease+powerful heat sink+variable speed fan | Active heat dissipation, balancing efficiency and noise |
Vehicle grade or extreme high temperature environment | Heat pipe/equalizing plate+high wind pressure fan+radiation coating | Extreme heat dissipation, reliability first |
Finally, a reminder: Before making any modifications, please make sure to confirm that it does not affect the optical structure and electrical safety of the screen, especially to avoid applying excessive pressure to the screen itself or blocking its ventilation holes.
If you can provide more specific application scenarios (such as the general structure of the device, internal space, main heat source location, etc.), I can provide more targeted heat dissipation layout suggestions.
AUO LCD DISPLAY:https://www.auo-lcd.com/products/auo-lcd-screen/
