Backlight Module Heat-Radiating Sheet With Bendable Extensions
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Solution Overview
Problem
Current high-brightness backlight modules for liquid crystal displays face challenges in heat dissipation without increasing module thickness, as existing heat-radiating structures often require additional components that bulk up the design.
Innovation Solution
A backlight module design incorporating a rubber frame, light guiding plate, light strip circuit board, optical film, and a heat-radiating sheet with bendable extension portions that can be attached to the light strip circuit board and other heat sources, using graphite or graphene materials to enhance heat dissipation without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If more LEDs or double crystal LED are used to improve brightness, then brightness is improved, but thermal power consumption increases
Solution Approach 1:
The patent converts the harmful thermal energy generated by LEDs into a beneficial heating effect for the phase change material. The heat-radiating sheet directs LED-generated heat to the phase change material, which absorbs thermal energy during phase transition, thereby converting waste heat into a useful thermal management function that cools the LED while maintaining display performance.
Solution Approach 2:
The patent introduces a phase change material as an intermediary between the heat source (LED) and the heat dissipation path. This intermediate layer absorbs and stores thermal energy through phase transition, mediating the heat transfer process and preventing direct thermal coupling between LEDs and the display panel, thus reducing thermal power consumption impact.
2Temperature
If a graphite heat-radiating sheet is added under the reflecting sheet or metal back plate, then heat-radiating effect is improved, but thickness of the module increases
Solution Approach 1:
The patent transitions from traditional planar heat dissipation architecture to a three-dimensional vertical integration approach. The heat-radiating sheet and phase change material are stacked within the existing module thickness, utilizing the vertical dimension for heat management functions without increasing the overall footprint or lateral dimensions of the display module.
Solution Approach 2:
The patent implements a nested structure where the phase change material is positioned between the heat-radiating sheet and the display panel, creating a layered configuration. The heat-radiating sheet is integrated with the back light assembly, and the phase change material is nested within the module thickness, allowing multiple functional layers to coexist without increasing overall module thickness.
3Temperature
If heat-radiating sheet with extension portions is used to improve heat dissipation, then heat-radiating efficiency is improved, but device complexity increases
Solution Approach 1:
The heat-radiating sheet serves multiple functions: it conducts heat from LEDs, directs heat to the phase change material through extension portions, provides structural support, and acts as a thermal interface layer. This multi-functionality reduces the need for separate dedicated heat dissipation components, thereby managing complexity while improving heat-radiating efficiency.
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
The solution effectively improves heat-radiating efficiency by allowing for selective connection of heat sources and distribution of heat across the module, preventing localized high temperatures and maintaining module thickness, while also potentially offering electromagnetic shielding.
Implementation Method 1
a heat-radiating sheet is disposed on a surface of a side of the light strip circuit board deviating from the light guiding plate, wherein the heat-radiating sheet includes a fitting portion attached onto the light strip circuit board and a first extension portion extending to an outside of the rubber frame
Implementation Method 2
a phase change material is disposed between the light guiding plate and the display panel
Data Source
AI summary
The present disclosure provides a backlight module including a rubber frame, a light guiding plate disposed in the rubber frame, a light strip located on a light incident side of the light guiding plate, an optical film set disposed on a surface of a side of the light guiding plate, and a reflecting sheet disposed on a surface of a side of the light guiding plate deviating from the optical film set. The reflecting sheet is fixed on the rubber frame by a double-faced adhesive, the light strip includes a light strip circuit board, a heat-radiating sheet is disposed on a surface of a side of the light strip circuit board deviating from the light guiding plate, and the heat-radiating sheet includes a fitting portion attached onto the light strip circuit board and a bendable first extension portion extending to an outside of the rubber frame.