Backlight Unit Holder Members Prevent Light Guide Plate Thermal Deformation
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Solution Overview
Problem
Existing edge-type backlight units for LCD devices suffer from non-uniform luminance due to light reflection from guide grooves, thermal deformation of the light guide plate leading to boss breakage, and increased Bezel width due to enlarged light guide plate size.
Innovation Solution
A backlight unit design featuring a supporting case with holder members that deform to accommodate thermal expansion of the light guide plate, preventing deformation and movement, and maintaining uniform luminance while reducing Bezel width by eliminating the need for guide grooves and bosses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If guide grooves are formed in the light guide plate to prevent thermal deformation, then the light guide plate stability is improved, but non-uniform luminance occurs due to light reflection from the guide grooves
Solution Approach 1:
The patent removes the guide grooves from the light guide plate and extracts the stabilization function to separate holder members. This eliminates the harmful light reflection from grooves while maintaining thermal deformation prevention through the holder members that engage with boss structures.
Solution Approach 2:
The patent divides the stabilization function into separate components: holder members with elastic deformation capability and boss structures on the light guide plate. This segmentation allows the light guide plate surface to remain smooth for uniform luminance while the holder-boss mechanism handles thermal deformation independently.
2Stability of the object's composition
If boss structures are formed to prevent light guide plate movement, then the light guide plate position stability is improved, but the boss breaks due to thermal deformation stress
Solution Approach 1:
The patent makes the holder members dynamic by giving them elastic deformation capability. Instead of rigid boss structures that break under thermal stress, the holder members can elastically deform to accommodate thermal expansion and contraction, maintaining continuous contact and position stability without fracture.
Solution Approach 2:
The elastic holder members act as beforehand cushioning elements that absorb thermal deformation stresses before they can transmit damaging forces to the boss structures. This priorit cushioning prevents boss breakage while maintaining light guide plate stability.
3Stability of the object's composition
If guide grooves are added to the light guide plate to prevent thermal deformation, then the structural support is improved, but the Bezel width increases due to enlarged light guide plate size
Solution Approach 1:
The patent extracts the structural support function from the light guide plate itself (by removing guide grooves) and places it in separate holder members. This allows the light guide plate to maintain its original compact size for narrow Bezel width while the holder members provide the necessary structural support and thermal deformation prevention.
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 ensures uniform luminance and prevents thermal deformation of the light guide plate, thereby reducing Bezel width and enhancing the aesthetic and functional performance of LCD devices.
Implementation Method 1
a plurality of holder members disposed between said supporting side wall and side surfaces of said light guide plate, said holder members being deformed in shape by thermal deformation of said light guide plate
Implementation Method 2
thermal deformation of the light guide plate
Data Source
AI summary
Discussed are a backlight unit and an LCD device including the same, which prevent the thermal deformation and movement of a light guide plate and realize uniform luminance. The backlight unit includes a supporting case supporting a supporting side wall having a receiving space, a light guide plate placed in the receiving space of the supporting case, a light source member irradiating light on a light incident surface prepared in a side surface of the light guide plate, an optical sheet member disposed on the light guide plate, and a plurality of holder members disposed at certain intervals between the supporting side wall and some side surfaces of the light guide plate except the light incident surface. The holder members are deformed in shape by thermal deformation of the light guide plate.