Slim Linear LED Lighting Device for Automotive Lamps
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Solution Overview
Problem
Conventional LED lighting devices for vehicular lamps face challenges in achieving uniform illumination, high luminous intensity, and compact design due to the size and spacing of LED light sources, which limits their suitability for streamlined and confined-space applications, and fails to meet photometry requirements for vehicular lamps.
Innovation Solution
A slim linear LED lighting device utilizing a printed circuit board with closely arranged LED Bars, each containing multiple LED chips and a strip-shaped condensing lens, which reduces the beam angle and enhances luminous intensity, allowing for uniform and continuous illumination suitable for vehicular lamps with a thin light blade structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional packaged LEDs are used as light sources, then the lamp body can be designed with simple structure, but the lamp body becomes larger or thicker and cannot meet the streamlined and confined-space requirements
Solution Approach 1:
The patent merges multiple LED chips (at least three) into a single integrated light emitting unit with shared optical components. The LED chips are arranged in an array and share common reflectors and diffusers, eliminating the need for separate optical components for each LED. This integration reduces the overall lamp body thickness while maintaining the required light output and uniformity.
Solution Approach 2:
The patent transitions from using individual packaged LEDs (point sources) to a planar array of multiple LED chips arranged in a specific geometric pattern. This dimensional arrangement allows the light sources to be distributed across a surface area, creating a linear light source that achieves uniform illumination without increasing the lamp body thickness in the perpendicular dimension.
2Illumination intensity
If additional optical components such as reflectors, diffusers, and refractive lenses are used to convert discrete point light sources into uniform planar or linear light sources, then uniform illumination is achieved, but the lamp body becomes larger or thicker
Solution Approach 1:
Multiple LED chips share common optical components including reflectors and diffusers. The reflectors are positioned behind the LED chip array to collect and redirect light, while diffusers are placed in front to scatter and uniformize the combined light output. This shared optical system achieves uniform linear light distribution without requiring separate optical components for each LED, thereby reducing overall thickness.
Solution Approach 2:
The patent employs different optical components at different locations to optimize light distribution. Reflectors are positioned at the rear of the LED array to address light extraction efficiency, while diffusers are positioned at the front to achieve uniform light output. Each optical component is strategically placed to address specific local requirements of the light distribution system.
3Ease of manufacture
If multiple packaged LEDs are arranged in a strip-shaped light source with larger size and spacing, then the manufacturing is easier, but the light output appears non-uniform with visible granular patterns
Solution Approach 1:
The light source is segmented into multiple individual LED chips arranged in a dense array pattern rather than using fewer packaged LEDs. This segmentation allows for finer spatial distribution of light sources, creating a more uniform linear light source that eliminates visible granular patterns while maintaining manufacturability through standardized chip mounting processes.
Solution Approach 2:
The patent changes the spatial parameters of the light source arrangement by reducing the spacing between individual LED chips and increasing the number of chips in the array. This parameter change transforms the light output from a granular appearance to a uniform linear distribution, achieving visual uniformity while the chips remain small enough for standard manufacturing processes.
4Area of stationary object
If conventional LED light sources with larger beam angles are used, then the illumination covers wider area, but the luminous intensity in the center direction is reduced and does not meet photometry requirements for vehicular lamps
Solution Approach 1:
The patent applies different optical functions at different locations within the light emitting system. Reflectors are positioned at the rear to collect and redirect light forward, while diffusers are positioned at the front to scatter light laterally. This spatial differentiation of optical functions allows the system to achieve both high forward luminous intensity (for photometry compliance) and wide lateral illumination coverage.
Solution Approach 2:
The patent combines multiple LED chips in an array configuration with shared optical components to achieve both wide coverage and high intensity. The array of chips provides broad illumination area, while the integrated reflector-diffuser system concentrates and directs light to maintain high luminous intensity in the center direction, satisfying both requirements simultaneously.
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
The solution provides a compact, high-intensity, and uniform light distribution that meets the photometry requirements of vehicular lamps with reduced light output and energy consumption, enabling animated lighting functions while maintaining a slim profile.
Implementation Method 1
Each of the LED Bars contains a plurality of same kind of LED chips which are regularly and closely arranged in a line or lines on the upper layer of a substrate... The LED Bar has a strip-shaped condensing lens structure... the light output of the LED Bar in the cross section is condensed to a small beam angle
Implementation Method 2
the light guide is used to enable the horizontal incident light of LED to form a vertical upward light mainly through the total internal reflection inside the light guide
Data Source
Figure 1A~1B
Figure 1C
Figure 2A~2C
AI summary
A slim linear LED lighting device (1, 1a, 1b, 1c, 1d, 1e) is provided, including: a printed circuit board (20, 20a, 20b, 20c, 20d, 20e) on which a connecting circuit is provided, at least one power input component, and a plurality of LED Bars (30, 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h, 30j, 30k, 30p, 30w, 30y). The LED Bar (30, 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h, 30j, 30k, 30p, 30w, 30y) is formed by a plurality of the same kind of LED chips (33, 331, 332, 333, 334), and has a slim strip-shaped condensing lens (371, 372, 373, 374, 375) structure integrally formed in the LED Bar (30, 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h, 30j, 30k, 30p, 30w, 30y) packaging process by molding process to control the beam angle of the LED Bar (30, 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h, 30j, 30k, 30p, 30w, 30y) and therefore the light distribution of the slim linear LED lighting device (1, 1a, 1b, 1c, 1d, 1e). The LED Bar's (30, 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h, 30j, 30k, 30p, 30w, 30y) condensing lens (371, 372, 373, 374, 375) has a small cross-sectional dimension; therefore the effective utilization factor of the light is improved as the slim linear LED lighting device (1, 1a, 1b, 1c, 1d, 1e) is applied to a linear automotive lamp designed with a thin light blade (2) structure.