LED Lens with Alternating Side Surfaces for Uniform Illumination
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Solution Overview
Problem
Conventional liquid crystal display devices using side light sources face challenges in achieving high light efficiency and uniform luminance distribution due to the inefficiencies in coupling light from light emitting diodes (LEDs) with light guide plates, leading to non-uniform illumination and reduced light output.
Innovation Solution
A light source module comprising a circuit board with LEDs sealed by a lens body having alternating first and second side surfaces, where the LEDs are arranged to emit light at varying angles, enhancing light coupling and distribution, and a lens body with a cylindrical shape extending parallel to the LEDs' rectangular upper surfaces to improve light focusing and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional cylindrical lenses are used to focus light from LEDs on light guide plates, then light focusing capability is improved, but light coupling efficiency and luminance uniformity deteriorate
Solution Approach 1:
The lens body is divided into multiple lens units, each corresponding to a group of three LEDs (red, green, blue). Each lens unit independently focuses light from its corresponding LEDs, enabling precise control of light distribution and improving coupling efficiency with the light guide plate while maintaining uniform luminance.
Solution Approach 2:
The lens body has different local structures: the upper surface includes lens surfaces with specific curvatures for focusing, while side surfaces include light blocking portions to control light direction. This local differentiation allows the lens to simultaneously achieve good focusing capability and high coupling efficiency by directing light precisely where needed on the light guide plate.
2Reliability
If light emitting diodes are mounted on a circuit board and sealed by transparent resin, then LED protection and structural integrity are improved, but light efficiency and coupling deteriorate
Solution Approach 1:
The lens body acts as an intermediary component between the LEDs and the light guide plate. It provides protection to the LEDs while simultaneously functioning as an optical element that focuses and directs light, thereby maintaining high light coupling efficiency. The light blocking portions on the side surfaces further optimize light direction to improve coupling with the light guide plate.
3Length of moving object
If conventional optical systems are used with side light sources, then device thickness is reduced, but light coupling efficiency and luminance uniformity deteriorate
Solution Approach 1:
The lens body performs multiple functions simultaneously: it protects the LEDs, focuses light from each LED group, directs light toward the light guide plate through strategically positioned light blocking portions, and ensures uniform luminance distribution. This multi-functionality allows for a compact design with reduced thickness while maintaining high light coupling efficiency and uniform illumination.
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 significantly enhances light efficiency and achieves uniform luminance distribution by optimizing light emission angles and focusing, resulting in improved illumination for liquid crystal display devices.
Implementation Method 1
The light emitting diodes are sealed by a lens body. The lens body includes first portions each having two first side surfaces and second portions each having two second side surfaces
Implementation Method 2
The light emitted by the side light sources is diffusely reflected and directed to a back portion of a liquid crystal section by the light guide plate as a surface light source
Data Source
AI summary
The present invention provides an illumination device capable of improving an efficiency of acquiring light emitted by light emitting diodes, which are provided in a light source module and used as a light source, and capable of achieving a uniform luminance distribution, and provides a liquid crystal display device using the illumination device. The illumination device includes a circuit board, red, green and blue light emitting diodes, and a lens body. Each red, green and blue light emitting diode is mounted on the circuit board and connected with a wiring pattern formed on the circuit board. The lens covers the red, green and blue light emitting diodes, and includes first portions each having two first side surfaces and second portions each having two second side surfaces. The first and second portions are alternately arranged. A distance between the first side surfaces is larger than a distance between the second side surfaces. The three red, green and blue light emitting diodes are provided in each first portion of the lens.