Backlight Unit Height Difference Alignment
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Solution Overview
Problem
The existing liquid crystal display devices face challenges in light efficiency and assemblability due to misalignment between the outgoing side of the light emitting diode and the incident surface of the light guide plate, leading to light loss and assembly issues.
Innovation Solution
A backlight unit design with a bottom cover featuring a height difference region allows the outgoing side of the light emitting diode and the incident side of the light guide plate to face each other, minimizing light loss and improving assembly precision by ensuring proper alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the second reflective sheet is disposed on the FPC and the light guide plate is disposed on the reflective sheet, then light loss can be reduced, but it is difficult to assemble the outgoing side of the light emitting diode and the incident surface of the light guide plate to correspond to each other
Solution Approach 1:
The patent introduces a height dimension by forming a protrusion on the bottom cover and a corresponding recess on the light guide plate. This vertical dimensional change enables precise alignment between the LED outgoing side and the light guide plate incident surface, resolving the alignment difficulty while maintaining the reflective sheet configuration for light loss reduction.
2Ease of manufacture
If a uniform interval between the incident side and the FPC is maintained, then assembly can proceed, but assemblability deteriorates if the light guide plate moves freely or defective alignments occur
Solution Approach 1:
The patent implements preliminary anti-action by designing the protrusion and recess structures before assembly occurs. These pre-formed complementary features prevent unwanted movement and misalignment of the light guide plate during assembly, thereby maintaining assembly ease while significantly improving assembly reliability by eliminating free movement and defective alignments.
3Ease of operation
If the outgoing side of the light emitting diode and the incident surface of the light guide plate are not disposed to correspond to each other, then assembly may be simpler, but there may be a region where no light reaches and thus light efficiency can be deteriorated
Solution Approach 1:
The patent uses the protrusion and recess structures as intermediary alignment features that facilitate precise correspondence between the LED outgoing side and the light guide plate incident surface. This intermediary mechanism ensures optimal light transmission efficiency while maintaining assembly simplicity, as the complementary features guide proper alignment during the assembly process itself.
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 enhances light efficiency by maximizing light transmission and improves assemblability by preventing movement-related defects and misalignments, resulting in a more efficient and reliable liquid crystal display device.
Implementation Method 1
a light guide plate converting a light emitted from the light source into a plane light
Implementation Method 2
a reflective sheet disposed on the rear of the light guide plate... First and second reflective sheets 61 and 63 are disposed at a region having the light emitting diode 50 to guide light toward the light guide plate 40
Data Source
AI summary
A backlight unit is provided. The backlight unit includes: a bottom cover having a height difference region; a flexible printed circuit board side-contacting an inner side, the inner side corresponding to the height difference region of the bottom cover; a plurality of light emitting diodes mounted on the flexible printed circuit board; a light guide plate disposed on the same plane as the light emitting diode; and a reflective sheet attached to a bottom of the light guide plate to correspond to the height difference region of the bottom cover.