Edge-Lit Lighting Unit With Dual Light Source Groups
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Solution Overview
Problem
Conventional edge light type lighting units for large screen liquid crystal display equipment face challenges in achieving sufficient light intensity and uniformity due to the limited number of light sources and thicker light-guiding members, which result in ineffective areas and difficulty in obtaining the necessary light intensity for display equipment.
Innovation Solution
A lighting unit design featuring a light-guiding member with distinct areas for light mixing and output, where first and second light source groups are arranged adjacently with a tapered shape, and a central flat plane, allowing for efficient light mixing and output, reducing ineffective areas and enabling a thinner, brighter, and more uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional edge light type lighting unit uses a single light source group on one terminal surface, then the structure is simple, but the light intensity and uniformity are insufficient for large screen display
Solution Approach 1:
The lighting unit is divided into two independent light source groups (first and second light source groups) positioned on opposite terminal surfaces of the light-guiding member. Each group contains multiple light emitting devices that independently illuminate the light-guiding member from opposite directions, thereby increasing overall light intensity and improving uniformity across the display screen without creating a single point of failure
Solution Approach 2:
The patent combines the functions of multiple light sources and light mixing areas into a single integrated light-guiding member structure. The first and second light mixing areas merge the light paths from both light source groups, allowing the system to achieve high light intensity and uniformity while maintaining a compact overall structure
2Illumination intensity
If the light-guiding member is made thicker to accommodate more light sources, then light intensity increases, but the ineffective area for light mixing increases and the device becomes bulkier
Solution Approach 1:
Instead of increasing thickness in one dimension to accommodate more light sources, the patent utilizes the longitudinal dimension by placing light source groups on both terminal surfaces of the light-guiding member. This dimensional approach allows light to enter from both ends and mix efficiently within the existing thickness, achieving high light intensity without increasing the device profile
Solution Approach 2:
The light-guiding member is designed with distinct functional zones: first and second light mixing areas positioned near each terminal surface respectively, and a central light outputting area in the middle. This local differentiation allows each region to perform its specific function optimally - light mixing near the sources and light outputting from the center - thereby improving overall light efficiency without requiring increased thickness
3Illumination intensity
If a single light mixing area is used, then the structure is simpler, but light uniformity and distribution quality deteriorate
Solution Approach 1:
The light-guiding member is designed with distinct functional zones: first and second light mixing areas positioned near each terminal surface respectively, and a central light outputting area in the middle. This local differentiation allows each region to perform its specific function optimally - light mixing near the sources and light outputting from the center - thereby improving overall light efficiency without increasing thickness
Solution Approach 2:
The lighting unit is divided into two independent light source groups (first and second light source groups) positioned on opposite terminal surfaces of the light-guiding member. Each group contains multiple light emitting devices that independently illuminate the light-guiding member from opposite directions, thereby increasing overall light intensity and improving uniformity across the display screen
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 achieves high uniformity of illumination and a narrow frame, allowing for thin and bright display equipment with improved light intensity distribution, effectively addressing the limitations of conventional units.
Implementation Method 1
a light-guiding member (10)
Implementation Method 2
The light which is reflected at the reflector is light guided within the light-guiding member again
Data Source
AI summary
A light-guiding member is provided with two light source groups on its both terminals and the light-guiding board comprises two light mixing areas which have a cross section form which is symmetry for its center line, and a light outputting area between these. The light mixing areas function as an area in which the lights from each adjacent light source group are mixed and at the same time function as an area to output the mixed lights from each remote light source group. The light outputting area functions as an area to pass a part of the mixed lights from the two light source groups and at the same time functions as an area to output the rest.