LED Module Corner Extensions for LCD Light Uniformity
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Solution Overview
Problem
Conventional light-emitting diode (LED) modules mounted on strip-shaped printed circuit boards often exhibit low light uniformity in the corner and central areas of liquid crystal displays due to inadequate light distribution.
Innovation Solution
The design incorporates corner side extending portions on the light-emitting modules to direct light towards the corners and a concave-shaped light source support member with varying depth to enhance light uniformity, preventing dark regions and mura (uneven brightness) in these areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED packages are mounted on a strip-shaped PCB in a conventional manner, then the structure is simple and easy to manufacture, but light uniformity is poor in corner and central areas
Solution Approach 1:
The light emitting module is segmented into a body portion and four corner side extending portions, with each segment containing LED packages. This segmentation allows light to be distributed from multiple locations (center and corners) to improve overall light uniformity across the support member surface.
Solution Approach 2:
The corner side extending portions are specifically designed to extend toward corner areas that otherwise receive insufficient light. By placing LED packages in these extending portions, the invention provides localized light enhancement in the corner regions, creating non-uniform light source distribution that compensates for the non-uniform light reception pattern.
2Device complexity
If LED packages are mounted on a strip-shaped PCB, then the device complexity is low, but dark regions and mura appear in corner and central areas
Solution Approach 1:
The light emitting module is divided into a body portion and four corner side extending portions, with LED packages distributed across all segments. This segmentation enables light to reach corner and central areas of the support member, eliminating dark regions and mura without requiring complex additional optical components.
Solution Approach 2:
The corner side extending portions extend in directions toward the corner areas of the support member, adding spatial dimensionality to the light source arrangement. This dimensional extension ensures light coverage in previously underserved corner and central regions.
3Illumination intensity
If corner side extending portions are added to the light emitting module, then light uniformity is improved, but the device complexity increases
Solution Approach 1:
The corner side extending portions are merged with the body portion to form an integrated light emitting module. The PCB and LED packages are configured as a single unified structure, combining the functions of light generation and corner-area illumination in one component, thereby minimizing the increase in device complexity.
Solution Approach 2:
The light emitting module serves multiple functions: the body portion provides central illumination while the corner side extending portions provide corner area illumination. This multi-functional design improves light uniformity across the entire support member surface without requiring separate lighting systems for different regions.
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 configuration significantly improves light uniformity in both corner and central areas, preventing dark spots and mura, thereby enhancing the overall brightness and display quality of liquid crystal displays.
Implementation Method 1
A light-emitting diode (LED) is a semiconductor device which generates light
Implementation Method 2
a light emitting module having a form in which a large number of LED packages consisting of a light-emitting diode, a fluorescent member, an electrode, etc. are mounted
Data Source
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AI summary
An illuminating apparatus includes a support member comprising a light source support member having four corner areas; and a light emitter that is disposed on a surface of the light source support member, the light emitter including one or more light emitting modules, wherein each of the light emitting module comprises a strip-shaped printed circuit board (PCB) mounted on the light source support member and a plurality of light source packages that is mounted on the strip-shaped PCB and generates light; and four corner side extending portions that configure a portion of any one of one or more the light emitting modules and are extended toward the four corner areas of the light source support member.