Light Control Lens TIR Surface Uniformity
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Solution Overview
Problem
Conventional LED backlight devices suffer from non-uniform light distribution and light loss due to partial reflection at the light emitting surface, leading to inefficiencies in illumination uniformity and flux.
Innovation Solution
A light control lens with a total internal reflection (TIR) inclined surface, an aspherical light emitting surface, and a light incident surface with specific optical active areas and path conversion points, which redistributes light to enhance illumination uniformity and divergence angle, and reuses reflected light to improve light utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical lenses with enhanced refractive power are used to reduce luminous intensity in the paraxial region and compensate it to the far-axis region, then light uniformity is improved, but Fresnel's reflection phenomenon occurs on the light emitting surface, decreasing total flux
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the reflected light from the light emitting surface, which would normally be considered a loss, and redirecting it through the TIR inclined surface to become a useful component of the light distribution. The reflected light is converted from a harmful factor into a beneficial factor that contributes to uniform illumination.
Solution Approach 2:
The patent changes the optical parameters by introducing a TIR inclined surface with a specific included angle (less than 45 degrees) to control the reflection and redirection of light. This parameter change enables the system to achieve both improved light uniformity and maintained total flux by optimizing the light paths through precise angular control.
2Illumination intensity
If lenses with enhanced refractive power are used to redistribute light beam, then illumination uniformity is improved, but light utilization efficiency decreases due to reflection loss
Solution Approach 1:
The patent converts the harmful reflected light into a beneficial resource by using the TIR inclined surface to redirect it into the desired light distribution pattern. This eliminates the need to sacrifice light utilization efficiency for achieving uniform illumination.
Solution Approach 2:
The TIR inclined surface acts as an intermediary element between the light emitting surface and the final light distribution. It mediates the interaction by capturing the reflected light and redirecting it through total internal reflection, thereby improving both illumination uniformity and light utilization efficiency simultaneously.
3Illumination intensity
If conventional optical structures are used to control light distribution, then light uniformity is improved, but device complexity increases due to multiple optical components
Solution Approach 1:
The patent merges multiple optical functions into a single integrated light control lens structure. The combination of the light emitting surface, light incident surface, and TIR inclined surface in one component achieves light redistribution and reflection control without requiring separate optical elements, thereby reducing device complexity.
Solution Approach 2:
The light control lens is designed with multi-functionality, serving as both a light redistributing element and a reflection control element. The single component performs multiple functions that would traditionally require separate optical components, simplifying the overall device structure while maintaining improved light uniformity.
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 improved illumination uniformity and effective divergence angle of at least 120°, reducing light loss and heat accumulation, while allowing for more efficient light distribution and cost-effective design.
Implementation Method 1
at least a part of the light beam reflected from the light emitting surface is totally internally reflected by the TIR inclined surface
Implementation Method 2
using a lens to refract the light from an LED is the mainly solution in prior arts
Data Source
AI summary
The present disclosure discloses a light control lens and a light source device using the same. The light control lens comprises a light emitting surface, a light incident surface, and a total internal reflection (TIR) inclined surface. The light incident surface and the TIR inclined surface are at the opposite side of the light emitting surface. The TIR inclined surface is at the peripheral side of the light incident surface. Between the TIR inclined surface and a plane perpendicular to an optical axis of the light control lens, there is an included angle α of less than 45°. An effective radius of the light emitting surface is larger than the distance from an arbitrary point on the light emitting surface to a plane through an incident origin and perpendicular to the optical axis along the optical axis direction.