Light Source Module with Parabolic Reflective Surface
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Solution Overview
Problem
Conventional light source modules have broad light emitting angles, resulting in lower brightness at the normal viewing direction due to the distribution of light beams in both horizontal and vertical directions.
Innovation Solution
A light source module featuring a light guide plate with optical microstructure units, including recess and protrusion portions, and a light-collecting structure with parabolic reflective surfaces, which guides light beams to focus towards the normal viewing direction by refracting and reflecting them through a series of microstructures and a reflection sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light guide plate with dots, diffuser and prism films is used, then the light guide function is achieved, but the light emitting angle is broad and brightness at normal viewing direction is low
Solution Approach 1:
The light guide plate bottom surface is segmented into multiple optical microstructure units, each containing multiple optical microstructures with different orientations. This segmentation allows different regions to control light in different directions, achieving narrow beam angles while maintaining broad coverage.
Solution Approach 2:
Different optical microstructure units are designed with different local qualities - some units have optical microstructures oriented in first direction while others are oriented in second direction. This local differentiation enables precise control of light distribution in different angular ranges, focusing brightness at normal viewing direction.
2Stability of the object's composition
If optical microstructure units with recess and protrusion portions are introduced, then light collimation is improved, but device complexity increases
Solution Approach 1:
The optical microstructure units integrate multiple functions into a single component: light guidance, collimation, and angular control are all achieved within the light guide plate itself through the recess and protrusion portions, eliminating the need for separate optical elements.
Solution Approach 2:
The optical microstructures extend in different directional dimensions - some oriented in first direction and others in second direction. This dimensional arrangement enables three-dimensional light control from a two-dimensional surface structure, achieving narrow beam angles without adding physical layers.
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 module achieves high collimation and favorable brightness distribution in the normal direction by reducing light exiting angles and enhancing light usage efficiency, focusing light beams in both vertical and horizontal directions towards the normal viewing position.
Implementation Method 1
The light beams, entering the light guide plate, are guide by the optical microstructure unit to the first light emitting surface
Implementation Method 2
a first reflective surface connected with the second light emitting surface and the second light incident surface
Implementation Method 3
A section of the second reflective surface obtained by a first reference plane includes a sectional line, and the sectional line includes a first parabola
Data Source
AI summary
A light source module including a light guide plate, a light-collecting structure and a light emitting device is provided. The light guide plate has a first light emitting surface, a bottom surface, a first light incident surface connecting with the bottom surface and the first light emitting surface, and an optical microstructure unit. The optical microstructure unit includes at least two optical microstructures. Each optical microstructure has a recessing part and a protruding part on the bottom surface. The light-collecting structure has a second light emitting surface connecting with the first light incident surface, a second light incident surface and a reflecting surface connecting with the second light emitting surface and the second light incident surface. A sectional line obtained by sectioning the reflecting surface along a first reference plane includes a first parabola. The reference plane is parallel to the first light emitting surface.