Backlight Module Gap Design for LCD Thermal Management
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Solution Overview
Problem
Conventional backlight modules for LCDs suffer from inefficient heat dissipation, leading to elevated panel temperatures and the risk of liquid crystal liquefaction due to direct heat conduction from LED lightbars, which affects the optical display quality and longevity.
Innovation Solution
A backlight module design featuring a side frame with a groove to create a gap between the rear panel's side wall and the side frame, combined with a heat-shield material and thermal insulating spacers, prevents heat transfer from the light source to the LCD panel, maintaining the thin profile of LCD devices while enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the frame is directly arranged on the side wall in contact mode to achieve narrow frame design, then the device thickness is reduced, but heat is conducted from the LED lightbar through the side wall to the LCD panel causing overheating
Solution Approach 1:
The side wall structure is segmented into multiple parts: the first side wall portion contacts the frame, while the second side wall portion extends toward the LCD panel but maintains a gap. This segmentation allows the frame to be positioned away from the heat-generating LED lightbar while still providing structural support, thereby reducing heat conduction to the panel without significantly increasing device thickness.
Solution Approach 2:
The spacer serves as an intermediary component between the frame and the second side wall portion. It maintains a predetermined gap distance, preventing direct thermal contact between the frame (which is in contact with the LED lightbar) and the second side wall portion that is closer to the LCD panel, thus blocking the heat conduction path.
2Loss of energy
If air vents are used for heat dissipation through convection, then heat can be conducted outside, but the heat dissipation efficiency remains low
Solution Approach 1:
The harmful heat energy is extracted from the system by creating a gap between the frame and the second side wall portion, which interrupts the thermal conduction path. This extraction of heat through structural design, rather than relying solely on convection through air vents, significantly improves heat dissipation efficiency.
3Temperature
If the rear panel is moved backward to create a gap between the side wall and frame, then heat transfer is reduced, but the device thickness increases
Solution Approach 1:
The side wall is divided into two portions: the first side wall portion that contacts the frame and the second side wall portion that maintains a gap. This segmentation allows heat transfer prevention without requiring the entire rear panel to be moved backward, thus avoiding significant increases in device thickness.
Solution Approach 2:
Instead of creating distance in the thickness dimension (which would increase device volume), the solution creates a gap in the lateral dimension by extending the second side wall portion toward the LCD panel while maintaining separation from the frame. This dimensional approach prevents heat transfer without compromising the thin profile.
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
Effectively blocks heat transfer from the light source to the LCD panel, reducing the risk of liquid crystal liquefaction and improving optical display quality by utilizing a gap and heat-shield materials to manage heat dissipation without increasing device thickness.
Implementation Method 1
the heat of the LED lightbar is upward conducted to the frame through the side wall of the rear panel, and then is conducted to the panel through a spacer
Implementation Method 2
combined with a heat-shield material and thermal insulating spacers, prevents heat transfer from the light source to the LCD panel
Data Source
AI summary
The invention provides a backlight module and a LCD device. The backlight module includes a side frame, and a rear panel; the rear panel is provided with a side wall fixedly matched with the side frame, the side wall of the rear panel is provided with a light source, and a gap is reserved between the top of the side wall and the side frame. The invention can effectively block the path that the heat at the side of the light source is transferred to the LCD panel, and can effectively prevent the risk of the liquid crystal liquefaction of the LCD panel, thereby improving the optical display taste of the LCD panel.