Optical Device Recessed Curved Surface Uniform Light Distribution
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Solution Overview
Problem
Wide beam angle lenses in light emitting device packages often result in non-uniform light distribution, leading to defects such as Mura in lighting and display devices due to uneven diffusion of light.
Innovation Solution
An optical device with a recessed curved surface and a pointed vertex in its central portion, where the light is incident, and a convex second surface for uniform light emission, ensuring continuous slope variations and improved diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide beam angle lens is used to spread light laterally, then light distribution coverage is improved, but luminance uniformity deteriorates due to non-uniform diffusion
Solution Approach 1:
The incident portion is designed with a pointed vertex in its central region and curved surfaces with varying slopes, creating non-uniform local optical properties. This causes light rays incident at different positions to be refracted at different angles, redistributing the light intensity to achieve uniform luminance across the exit surface while maintaining wide beam angle coverage.
Solution Approach 2:
The optical device changes the refraction parameters by designing the incident portion with specific curved surface profiles and slope variations. By controlling the angle and curvature of the incident surface, the light path and intensity distribution are modified to achieve both wide coverage and uniform luminance output.
2Ease of manufacture
If a conventional lens structure is used, then manufacturing process is simple, but optical uniformity is poor leading to Mura defects
Solution Approach 1:
The incident portion employs curved surfaces with specific geometric profiles, including a pointed vertex and continuously varying slopes. This curved geometry is designed to refract light uniformly across different incident angles and positions, eliminating Mura defects while maintaining compatibility with conventional injection molding processes for ease of manufacture.
3Device complexity
If light is incident uniformly on the lens, then the structure is simple, but luminance distribution becomes non-uniform in the central region
Solution Approach 1:
Instead of requiring complex external light control systems, the solution embeds the uniforming function directly into the lens structure through the incident portion's pointed vertex and curved surfaces. This local structural modification passively achieves uniform luminance distribution without increasing overall device complexity.
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 optical device enhances luminance uniformity, enabling the emission of soft, diffused light while simplifying the manufacturing process and reducing costs through improved productivity.
Implementation Method 1
wide beam angle lenses are used to spread light laterally over a wide region from a central portion thereof, using the principle of refraction
Data Source
AI summary
An optical device and a light source module including the same are provided. The optical device includes a first surface including an incident portion through which light that is emitted from a light source is incident, and a second surface through which the light incident through the incident portion is emitted. The incident portion may include a curved surface that is recessed toward the second surface, and a pointed vertex to which the curved surface is recessed, the pointed vertex being in a central portion of the optical device, and the central portion being through which an optical axis of the optical device passes.