Reflective Diffusing Lens for LCD Backlight Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current reflective diffusing lenses in LCD backlight units face challenges in achieving sufficient light diffusion and uniform luminance, leading to luminance mura issues that degrade display quality, and increasing the number of LED elements to address this increases cost and power consumption.
Innovation Solution
A reflective diffusing lens design with a concave light incident part, a reflection part, and a re-reflection part, featuring a micro pattern on the upper surface and inclined emission surfaces, which enhances light reflection and distribution, minimizing luminance mura and improving even light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional reflective diffusing lens is used, then light diffusion is achieved, but luminance uniformity deteriorates due to luminance mura
Solution Approach 1:
The lens is divided into multiple functional parts: a light incident part with an incident surface, a reflection part with a reflection surface, and a light emitting part with an emission surface. Each part performs a specific function in controlling light paths, and together they achieve both diffusion and uniformity by segmenting the light control process into distinct stages.
Solution Approach 2:
The patent introduces a re-reflection part formed outside the radial direction of the light incident part on the lens lower surface. This adds a new spatial dimension for light reflection, allowing light to be re-reflected at angles that contribute to both diffusion and uniform luminance distribution across the emission surface.
2Manufacturing precision
If the number of LED light emitting elements is increased to prevent luminance mura, then luminance uniformity improves, but cost and power consumption increase
Solution Approach 1:
The reflective diffusing lens is designed to perform multiple functions simultaneously: it diffuses light, ensures uniform luminance distribution, and controls light paths through its multiple parts (incident part, reflection part, emission part, and re-reflection part). This multi-functionality allows a single lens to replace what would otherwise require multiple LED elements to achieve the same effect.
3Illumination intensity
If a refractive diffusing lens is used, then light is refracted to disperse light at a wide angle, but light reflection capability is insufficient
Solution Approach 1:
The lens combines refractive and reflective properties in a single structure. The light incident part, reflection part, and emission part work together to both refract and reflect light, creating a composite optical system that leverages both mechanisms to achieve superior light diffusion and uniformity compared to refractive lenses alone.
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 design improves light diffusion and luminance uniformity, reducing the need for multiple LED elements, thereby lowering costs and power consumption while maintaining high display quality.
Implementation Method 1
a reflection part which is disposed at the upper side of the light incident part and formed concavely toward a lower side, and has a reflection surface on which a part of the light emitted from the light incident part is reflected
Implementation Method 2
a re-reflection part which is formed outside a radial direction of the light incident part on a lens lower surface connecting the light incident part and the light emitting part and has a re-reflection surface on which the other part of the light emitted from the incident surface is reflected
Implementation Method 3
a light incident part which is formed concavely toward an upper side and has an incident surface to which the light emitted from the light emitting element is incident
Data Source
AI summary
Provided is a reflective diffusing lens which controls light emitted from a light emitting element according to an embodiment. The reflective diffusing lens is a reflective diffusing lens controlling the light emitted from the light emitting element and may comprise a light incident part which is formed concavely toward an upper side and has an incident surface to which the light emitted from the light emitting element is incident; a light emitting part which has an emission surface to which the light incident to the incident surface is emitted; a reflection part which is disposed at the upper side of the light incident part and formed concavely toward a lower side, and has a reflection surface on which a part of the light emitted from the light incident part is reflected; and a re-reflection part which is formed outside a radial direction of the light incident part on a lens lower surface connecting the light incident part and the light emitting part and has a re-reflection surface on which the other part of the light emitted from the incident surface is reflected.