Reflective Unit Air Cells for LED Luminance
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Solution Overview
Problem
Conventional lighting devices face challenges in maximizing luminance and light reflectance without increasing thickness or the number of light sources, particularly in large-scale applications where image quality is compromised due to the thickness of light guide plates.
Innovation Solution
A lighting device with a reflective unit featuring a patterned adhesive material on a printed circuit board, creating air cells that communicate with each other, and a resin layer that replaces the light guide plate, enhancing light reflection and diffusion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate is used to guide light from LED sources, then light distribution is improved, but the thickness of the lighting device increases
Solution Approach 1:
The patent removes the light guide plate from the lighting device structure entirely. Instead of using a light guide plate to distribute light, the invention uses LED arrays directly mounted on the printed circuit board with reflective patterns on the board surface to achieve light distribution, thereby eliminating the thickness contribution of the light guide plate
Solution Approach 2:
The printed circuit board is given multiple functions: it serves as both the electrical connection substrate for LED mounting and as a light distribution component through its reflective patterns. This eliminates the need for a separate light guide plate while maintaining light distribution functionality
2Illumination intensity
If the number of LED light sources is increased to improve luminance, then brightness is improved, but device complexity and thickness increase
Solution Approach 1:
The patent applies reflective patterns with varying densities at different locations on the printed circuit board. Areas with higher light reflection needs have denser or more reflective patterns, optimizing light distribution and luminance without uniformly increasing the number of LED sources across the entire device
Solution Approach 2:
The invention changes the optical parameters of the printed circuit board by applying reflective patterns with different reflectivity levels, densities, and geometries. This allows optimization of light extraction and distribution efficiency from existing LED sources, improving luminance without adding more LEDs
3Illumination intensity
If optical sheets are added to improve light efficiency, then light control is improved, but the thickness of the device increases
Solution Approach 1:
The patent combines the light control function previously performed by separate optical sheets with the printed circuit board structure itself. The reflective patterns are integrated directly into the PCB, merging the electrical substrate and optical control functions into a single component, thereby eliminating the need for additional optical sheets that would increase thickness
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 improves luminance and light reflectance, reduces the thickness of the lighting device, and allows for flexible design by eliminating the need for a light guide plate, while maintaining stable and uniform optical characteristics.
Implementation Method 1
light L incident to the light guide plate 30 is reflected upward by a fine reflective pattern or a reflection sheet 40 provided a bottom surface of the light guide plate
Implementation Method 2
a first adhesive pattern layer which bonds the first and second reflective films
Data Source
AI summary
Provided is a lighting device comprising: a plurality of LED light sources formed on a printed circuit board; and a reflective unit stacked on the printed circuit board in a structure in which the LED light sources penetrate, wherein the reflective unit comprises a first reflective film and a second reflective film disposed to oppose to each other, and a first adhesive pattern layer which bonds the first and second reflective films, and in which a plurality of unit air cells having a first air area formed in an inner part thereof are closely disposed to communicate with each other.According to the present invention, it is advantageous that the improvement of luminance as well as the improvement of light reflectance can be maximized by providing the reflective unit having an air area to a surface of the printed circuit board.