LED Light Source Module with Reflective and Fluorescent Surfaces
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Solution Overview
Problem
Liquid crystal displays (LCDs) require a separate backlight unit for illumination, and existing LED-based backlight units face challenges in achieving uniform luminance distribution, preventing light leakage, and hot spots, especially in slim display structures.
Innovation Solution
A light source module with a circuit board, LED chips, a reflective surface on the upper surface to reflect light, and a fluorescent surface on the side surfaces to emit light, which controls the emission angles to achieve uniform luminance and prevent light leakage and hot spots without additional optical lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LED backlight units are used, then light source function is provided, but uniform luminance distribution cannot be achieved and hot spots occur
Solution Approach 1:
The LED chip is divided into distinct functional regions: a reflective surface region on the upper surface and fluorescent surface regions on the side surfaces. This segmentation allows different parts of the LED chip to perform different optical functions, with the reflective surface directing light upward and the fluorescent surfaces emitting light sideways, achieving uniform luminance distribution without hot spots
Solution Approach 2:
Different surfaces of the LED chip are given different optical properties: the upper surface has a reflective surface with high reflectivity to redirect light, while the side surfaces have fluorescent surfaces that convert and emit light. This local differentiation of optical quality enables precise control over light distribution patterns, eliminating hot spots and achieving uniform illumination
2Illumination intensity
If additional optical lenses are added to control light emission, then light distribution is improved, but device complexity and thickness increase
Solution Approach 1:
The optical control functions are merged directly into the LED chip structure itself. The reflective surface and fluorescent surfaces are integrated onto the LED chip, combining the light source generation and light distribution control into a single component. This eliminates the need for separate optical lenses and reduces overall device complexity while maintaining effective light distribution control
Solution Approach 2:
The LED chip is designed to perform multiple functions simultaneously: it generates light through LED emission, controls light direction through the reflective surface, and converts/emits light through the fluorescent surfaces. This multi-functionality consolidates what would traditionally require multiple separate components into a single universal light-emitting element, reducing device complexity and thickness
3Ease of manufacture
If LED chip structure is simplified, then manufacturing is easier, but light leakage and hot spots cannot be prevented
Solution Approach 1:
The LED chip is segmented into distinct reflective and fluorescent surface regions, creating a structured design that is straightforward to manufacture using standard semiconductor fabrication techniques. The clear functional separation makes the manufacturing process easier while the precise geometric arrangement of these segments effectively prevents light leakage and hot spots
Solution Approach 2:
The invention changes the optical parameters of different LED chip surfaces: the reflective surface is designed with specific reflectivity characteristics and geometric orientation, while the fluorescent surfaces have specific emission characteristics. These parameter changes are achieved through standard manufacturing processes and directly enable light leakage prevention and hot spot elimination without complicating fabrication
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 slim light source module with uniform luminance distribution, prevents light leakage and hot spots, and enhances the efficiency of the backlight unit by controlling light emission angles, suitable for slim display structures.
Implementation Method 1
a reflective surface on an upper surface of the LED chip configured to reflect light
Implementation Method 2
a fluorescent surface on at least one side surface of the LED chip configured to emit the light
Data Source
AI summary
Provided are a light source module and a backlight unit. According to an embodiment, the light source module comprises a circuit board, at least one LED chip electrically connected onto the circuit board, a reflective surface on an upper surface of the LED chip configured to reflect light, and a fluorescent surface on at least one side surface of the LED chip configured to emit the light.