Side-Emitting Coupling Lens for Uniform Backlight Distribution
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Solution Overview
Problem
Existing semiconductor light emitting device packaging technologies fail to provide high efficiency side-emitting capabilities, particularly in backlight applications, where uniform light distribution and reduced device count are desired.
Innovation Solution
A side-emitting coupling lens system with a direct lens for directing light, a first lens surface for total internal reflection, and a second lens surface for further reflection, allowing an angle between reflection directions of 70 to 110 degrees, along with additional parallel surfaces, is used to efficiently redirect light from a vertical to a horizontal direction, enabling uniform light distribution and dynamic control of light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional semiconductor light emitting device packaging is used, then basic light emission is achieved, but side-emitting efficiency is insufficient and uniform light distribution is not achieved
Solution Approach 1:
The packaging structure is divided into multiple functional components: a light emitting device body, a coupling lens with specific geometric surfaces, and a substrate. The coupling lens is segmented into a first lens surface and a second lens surface with specific angles and orientations, each contributing to different stages of light redirection and distribution.
Solution Approach 2:
The invention transitions light from a vertical emission direction to a horizontal side-emission direction by utilizing the geometric configuration of the coupling lens surfaces. The first lens surface redirects light at a first angle, and the second lens surface redirects it again at a second angle, achieving multi-dimensional light path control.
2Illumination intensity
If more light emitting devices are used to achieve uniform light distribution, then illumination uniformity improves, but device quantity and system complexity increase
Solution Approach 1:
The coupling lens is designed to perform multiple functions simultaneously: it acts as a light redirector, a light distributor, and a directional controller. By optimizing the angles and surface configurations of the lens, a single light emitting device achieves uniform side-emission light distribution that would otherwise require multiple devices.
3Adaptability or versatility
If conventional packaging structures are used, then basic light emission is provided, but dynamic control of light emission patterns is not achieved
Solution Approach 1:
The coupling lens is designed with specific geometric parameters (first angle and second angle between 45° and 60°) that enable dynamic control of light emission patterns. The angular relationships between the lens surfaces and the light emitting device allow for flexible adjustment of light direction and distribution characteristics.
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 achieves high efficiency in side-emitting light distribution, reducing the number of light emitting devices required and ensuring uniformity in backlight applications, while allowing for dynamic control of light emission patterns.
Implementation Method 1
a first lens surface for total internal reflecting light from light source to the first direction
Implementation Method 2
a second lens surface for total internal reflecting light from the first direction to a second direction
Data Source
AI summary
The present invention discloses a coupling lens system, which comprises a collimation lens for collimating light from light source to a first direction; a first lens surface for total internal reflecting light from light source to the first direction; and a second lens surface for total internal reflecting light from the first direction to a second direction. Wherein an angle between the first direction and the second direction can be larger than, smaller than or equal to 90 degrees, and preferably between 70 to 100 degrees. Additionally, the system further comprises at least one extra surface parallel to the second lens surface, wherein at least one extra surface has a length L and is parallel to each other. At the same time, each surface and another surface has a distance D in between, and the length L can be equaled to or larger than the distance D according to purposes and further modifies a shape of the coupling lens system.