Light Source Board Heat Radiation Protrusion for LCD Frame Width Reduction
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Solution Overview
Problem
Existing light source units for liquid crystal displays face challenges in reducing the width and thickness of the frame while maintaining component reliability and uniform light distribution, as increased arrangement density of light sources or current leads to heat generation issues, and conventional fixation methods like screws and adhesives either increase component count or fail due to heat-related issues.
Innovation Solution
A light source unit design that incorporates a light source board held by a case with integral, elastic holding members formed within the case's inner walls, eliminating the need for additional components and allowing for reduced frame width and thickness, while providing effective heat dissipation and maintaining positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat radiation members are provided to increase heat radiation capability, then heat dissipation is improved, but the width of frame or thickness of light source unit increases and number of components increases
Solution Approach 1:
The patent combines the heat radiation function with the light source board itself by providing a heat radiation protrusion that integrally protrudes from the light source board. This merging of functions eliminates the need for separate heat radiation members, thereby improving heat dissipation while avoiding increased frame width or component count.
2Temperature
If heat radiation members are provided to increase heat radiation capability, then heat dissipation is improved, but the number of components increases
Solution Approach 1:
The patent integrates the heat radiation function into the light source board structure itself through the heat radiation protrusion. This eliminates the need for separate heat radiation members, thereby improving heat dissipation while reducing the total number of components in the system.
Solution Approach 2:
The light source board is designed to serve multiple functions: it supports the light emitting elements, provides electrical connections, and simultaneously acts as a heat radiation structure through its protrusions. This multi-functionality improves heat dissipation without adding separate components.
3Reliability
If light source board is fixed with screws, then fixation reliability is improved, but spaces for screw heads are needed and frame thickness needs to be increased
Solution Approach 1:
The patent transitions from a two-dimensional fixation approach (screw heads on the surface) to a three-dimensional approach by providing protrusions that extend from the light source board and engage with corresponding structures in the frame. This dimensional change eliminates the need for screw heads while maintaining fixation reliability.
4Device complexity
If adhesive is used to fix light source board, then component count is reduced, but adhesive may peel off due to heat influence
Solution Approach 1:
The patent replaces the chemical bonding mechanism of adhesives with a mechanical interlocking system. The protrusions on the light source board engage with corresponding recesses or structures in the frame, providing a mechanical fixation that is resistant to heat-induced peeling while maintaining simple assembly.
5Illumination intensity
If arrangement density of light sources is increased, then luminance is improved, but heat generation increases
Solution Approach 1:
The patent segments the heat radiation function by providing multiple protrusions distributed across the light source board. This segmentation allows heat from multiple densely packed light emitting elements to be efficiently conducted and dissipated through multiple pathways, enabling high luminance while managing heat generation.
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 allows for reduced frame width and thickness without increasing the number of components, enhances heat radiation, and prevents positional deviation of the light source board, ensuring uniform light distribution and improved reliability.
Implementation Method 1
a light source device comprising: a light source board (6) on which light sources (5) are mounted; a case (A) which houses the light source board (6); and elastic holding members (9) which are formed integrally with inner walls of the case (A), and hold the light source board (6) with the case (A)
Implementation Method 2
the light emitted from a side light unit that incorporates a linear light source such as a cold cathode tube or point light sources such as a light emitting diode (LED) is reflected within the light guide plate and diffused by a diffusion pattern provided in the light guide plate
Implementation Method 3
the light emitted from a side light unit that incorporates a linear light source such as a cold cathode tube or point light sources such as a light emitting diode (LED) is reflected within the light guide plate and diffused by a diffusion pattern provided in the light guide plate
Implementation Method 4
the arrangement density of light sources or the current supplied to each light source is increased by providing the heat radiation member for radiating heat generated by the light sources
Data Source
AI summary
A light source unit includes: a light source board mounted with a light source; a case that houses the light source board; and a holding member that is disposed integrally with an inner wall of the case, and hold the light source board with the case.