Backlight Module Heat Dissipation via Adhesive Tape
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Solution Overview
Problem
Existing backlight modules in liquid crystal display devices face challenges in heat dissipation efficiency due to increased thickness from heat dissipation structures and air gaps between reflective sheets and LEDs, which hinder effective temperature management.
Innovation Solution
A backlight module design featuring a mold frame, light guide board, optic film, light source, and a heat dissipative sheet directly attached to the light source using a double-sided adhesive tape, allowing for direct heat dissipation without additional obstacles, and optionally including a reflector sheet and extension sections for enhanced thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heat dissipation film is attached to the back side of the reflective sheet, then heat dissipation capability is improved, but the overall thickness of the module is increased
Solution Approach 1:
The heat dissipation structure transitions from a planar attachment on the reflective sheet to a three-dimensional heat dissipation cavity formed by the reflective sheet's bent portions. This dimensional change allows heat dissipation functionality to be integrated within the existing thickness envelope rather than adding to it externally.
Solution Approach 2:
The reflective sheet serves dual functions: it reflects light to illuminate the display and simultaneously acts as a heat dissipation structure through its bent portions forming cavities. This multi-functionality eliminates the need for separate heat dissipation components that would increase thickness.
2Ease of manufacture
If air gap is present between the reflective sheet and the LEDs, then ease of assembly is improved, but heat dissipation efficiency is worsened
Solution Approach 1:
The bent portions of the reflective sheet act as intermediary thermal conduction paths between the LEDs and the heat dissipation cavities. These structured portions provide direct thermal contact while maintaining the air gap for assembly ease, serving as thermal mediators that bridge the gap between conflicting requirements.
Solution Approach 2:
The reflective sheet has different structural qualities in different regions: flat portions for light reflection and bent portions for heat dissipation. This local differentiation allows the sheet to provide both assembly ease through air gaps in most areas while maintaining efficient heat dissipation through localized thermal contact points.
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 design improves heat dissipation efficiency by directly dissipating heat from the light source, reducing the overall thickness of the module and enhancing thermal conductivity, thereby maintaining display performance while preventing heat-related issues.
Implementation Method 1
The heat dissipative sheet is attached to a surface of the double-sided adhesive tape that is opposite to the mold frame in such a way that a projection of the light source is cast to the heat dissipative sheet
Implementation Method 2
The light source is fixed by a double-sided adhesive tape to the mold frame
Data Source
AI summary
A backlight module includes a mold frame, a light guide board, an optic film, a light source, and a heat dissipative sheet. The light guide board has a light incident surface and a light exit surface that is arranged adjacent to the light incident surface. The light source is arranged opposite to the light incident surface of the light guide board. The optic film is attached to the light exit surface. The light source and the light guide board are mounted inside the mold frame. The light source is fixed by a double-sided adhesive tape to the mold frame. The heat dissipative sheet is attached to a surface of the double-sided adhesive tape that is opposite to the mold frame and a projection of the light source is cast to the heat dissipative sheet. A liquid crystal panel and a display screen are also provided.