LED Light Bar Structure with Complementary Chromaticity Mixing
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Solution Overview
Problem
Conventional LED light bar structures face challenges in achieving uniform white light emission and controlling chromaticity, leading to material wastage and difficulty in maintaining consistent chromaticity across different backlight modules, resulting in the 'Mura' phenomenon.
Innovation Solution
The LED light bar structure comprises a circuit board with light source sets, each consisting of a first LED and a second LED with complementary chromaticities, arranged in an up-down or left-right configuration, allowing for uniform white light mixing without considering other sets, and optionally including a third LED with a white light area chromaticity between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LED light bar structures use optical mixing methods (blue LED with yellow fluorescent body, or ultraviolet LED with RGB fluorescent body), then white light can be generated, but chromaticity difference and non-uniform mixing occur
Solution Approach 1:
The patent divides the light source into multiple independent LED chips with different chromaticities (first LED with first chromaticity, second LED with second chromaticity, third LED with third chromaticity) arranged in specific patterns. Each LED chip operates independently, and their lights mix optically to produce uniform white light, avoiding the chromaticity control issues of conventional single-source optical mixing methods.
Solution Approach 2:
The patent applies different chromaticity characteristics to different local positions of the light bar structure. Specifically, it uses first LEDs with first chromaticity, second LEDs with second chromaticity, and third LEDs with third chromaticity arranged in specific spatial patterns (alternate arrangement, group arrangement, or mixed arrangement) to achieve uniform chromaticity distribution across the entire light bar.
2Manufacturing precision
If alternate mixing of LEDs with different chromaticities is used to achieve white light, then chromaticity can be controlled, but material selection becomes too exacting causing material wastage
Solution Approach 1:
The patent changes the chromaticity parameters of the LED chips by selecting LEDs with different chromaticity values (first chromaticity, second chromaticity, third chromaticity) from available LED types. This allows flexible combination of different chromaticity parameters to achieve uniform white light without requiring extremely precise chromaticity matching, thereby reducing material wastage.
Solution Approach 2:
The patent creates a composite light source system combining multiple LED chips with different chromaticities (first LED, second LED, third LED) in a single light bar structure. This composite approach allows the system to achieve uniform white light output by leveraging the complementary chromaticity characteristics of different LED materials, reducing the need for exacting material selection.
3Loss of energy
If conventional LED light bar structures are used, then energy saving and environmental protection are achieved, but uniform white light emission and consistent chromaticity control across different modules remain difficult
Solution Approach 1:
The patent segments the light bar into multiple independent LED chip units with different chromaticities arranged in specific patterns. This segmentation allows each LED type to contribute its specific chromaticity characteristics, and through optical mixing, achieves uniform white light emission that is consistent across different light bar modules while maintaining LED energy efficiency.
Solution Approach 2:
The patent creates a universal light bar structure that can be applied to different display panel sizes and types (including large-size panels) while maintaining consistent chromaticity performance. The multi-chromacity LED arrangement pattern serves multiple functions: achieving uniform white light, ensuring chromaticity consistency across modules, and providing flexibility for different application scenarios.
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 ensures uniform white light emission, prevents material wastage, and simplifies the control of identical chromaticity across different backlight modules, eliminating the 'Mura' phenomenon and enhancing flexibility for larger LCD panels.
Implementation Method 1
each of the light source sets comprises a first LED and a second LED; and the chromaticity of the first LED and the chromaticity of the second LED are complementary
Implementation Method 2
The white light LED is usually achieved by a means of optical mixing
Implementation Method 3
emit lights toward a side edge of a light guide plate, and then emit lights toward a top surface of the light guide plate by special reflection of the light guide plate
Data Source
AI summary
The present invention discloses a light emitting diode (LED) light bar structure and a backlight module. The LED light bar structure is provided with a plurality of the light source sets. Each of the light source sets comprises a first LED and a second LED, and the chromaticity of the first LED and the chromaticity of the second LED are complementary. Hence, it is not necessary to consider with the others of the light source sets, so that it can achieve mixing a uniform white light, and the backlight module will not appear the phenomenon of “Mura”. Besides, the material of the LED will not be wasted, and it is easy to control the identical chromaticity between the different backlight modules.