Segmented Back Light Unit for Uniform Display Illumination
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Solution Overview
Problem
Conventional back light units require replacing the entire light guide plate if it is damaged, leading to inefficiencies in assembly and management, especially for large-sized displays, where the size of the light guide plate increases with the screen size, making manufacturing and assembly cumbersome and time-consuming.
Innovation Solution
A back light unit comprising multiple light emitting device assemblies with a light emitting device module, a light guide plate, a reflective sheet, and adjustable light parts that allow for partial overlap and spacing to distribute light uniformly, reducing the need for full plate replacement and enhancing assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single large-sized light guide plate is used to cover the entire screen, then the light distribution can be continuous, but the assembly becomes troublesome and time-consuming, and replacement is required for the entire plate if any portion is defective
Solution Approach 1:
The light guide plate is divided into multiple smaller light guide plates that are arranged adjacent to each other. Each light guide plate is covered by a separate light emitting device assembly, allowing independent assembly and replacement. This segmentation resolves the contradiction by maintaining continuous light distribution through proper arrangement while significantly improving assembly efficiency and reducing replacement scope when defects occur.
2Area of stationary object
If a single large-sized light guide plate is used, then light can be distributed across the entire screen, but the size increases in proportion to screen size making manufacturing and assembly cumbersome
Solution Approach 1:
The large light guide plate is segmented into multiple smaller light guide plates corresponding to different regions of the screen. Each smaller plate can be manufactured and assembled independently, making the process much easier and less cumbersome while still achieving full screen coverage when all segments are arranged together.
Solution Approach 2:
The light guide plate assembly transitions from a single-plane large plate to a multi-plane segmented arrangement. Multiple light guide plates are disposed adjacent to each other in a distributed configuration, achieving full area coverage while simplifying manufacturing and assembly through reduced individual component sizes.
3Device complexity
If a single light guide plate is used, then the structure is simple, but if any portion is scratched, stained or deformed, the entire plate must be replaced
Solution Approach 1:
The light guide plate is divided into multiple independent segments, each covered by a light emitting device assembly. This segmentation maintains relative structural simplicity while dramatically improving ease of repair, as only the specific segmented portion containing the defect needs to be replaced rather than the entire plate.
4Productivity
If multiple light emitting device assemblies are used, then assembly and management become easier, but uniform light distribution must be maintained across boundaries
Solution Approach 1:
Light adjustment parts are provided on the light guide plates with different light reflection rates at different locations. Specifically, light adjustment parts are disposed at regions adjacent to the light emitting device modules, and these parts have different reflection characteristics compared to other regions. This local quality adjustment ensures uniform light distribution across the boundaries of adjacent light guide plates while maintaining the benefits of multiple assemblies.
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 enables easier assembly and management of light emitting device assemblies, ensuring uniform light distribution across the screen while minimizing the risk of hot spots and thermal deformation, thus improving the overall performance and reliability of the back light unit.
Implementation Method 1
a light guide plate having a light incidence part disposed adjacent to the light emitting device module so that light generated from the light emitting device is incident upon the light incidence part and a light emission part from which the incident light is emitted
Implementation Method 2
a reflective sheet provided at one side of the light guide plate
Data Source
AI summary
A back light unit including a light emitting device assembly is disclosed. The light emitting device assembly includes a light emitting device module having a light emitting device, a light guide plate having a light incidence part disposed adjacent to the light emitting device module so that light generated from the light emitting device is incident upon the light incidence part and a light emission part from which the incident light is emitted, a reflective sheet provided at one side of the light guide plate, and a light adjustment part extending from the reflective sheet for adjusting a reflection amount of the light emitted from the light guide plate.