Light Source Module Prism Sheet Light Guidance
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Solution Overview
Problem
Conventional light source modules experience significant light energy attenuation due to repeated reflections between the prism sheet and the reflective sheet, leading to decreased luminance, and existing solutions like increasing the number of light sources or microstructures on the light guide plate are costly and offer limited improvements.
Innovation Solution
A light source module design featuring a light guide plate with a first, second, and third prism sheet, where the first prism sheet adjusts the beam to a specific angle, allowing it to bypass the reflective sheet and be refracted by the second and third prism sheets to align with the light emitting surface normal, thereby reducing reflections and enhancing luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of reflections between the prism sheet and the reflective sheet is increased, then the light can be guided more effectively, but the light energy attenuation increases and luminance decreases
Solution Approach 1:
The patent extracts the light guidance function from the reflective sheet by introducing a light guide plate with a light guide layer. This light guide layer guides light from the light source directly to the display panel, eliminating the need for repeated reflections between the prism sheet and reflective sheet, thereby reducing light energy attenuation while maintaining effective light guidance
Solution Approach 2:
The light guide plate acts as an intermediary component between the light source and the display panel. It receives light from the light source and guides it through total internal reflection within the light guide layer to the display panel, serving as a mediator that eliminates the harmful repeated reflections while maintaining light guidance effectiveness
2Illumination intensity
If the number of light sources or microstructures on the light guide plate is increased, then the luminance can be enhanced, but the manufacturing cost increases
Solution Approach 1:
The patent changes the parameters of the light guide layer, including its refractive index, thickness, and microstructure density, to optimize light extraction and luminance. By adjusting these parameters, the system achieves enhanced luminance without increasing the number of light sources or microstructures, thereby controlling manufacturing cost
3Illumination intensity
If microstructures with different densities or shapes are disposed on the light guide plate, then the light extraction can be improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by creating microstructures with varying densities or shapes at different locations on the light guide plate. This allows optimization of light extraction at specific regions while maintaining simpler structures in other areas, balancing light extraction efficiency with 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
This design effectively increases the luminance of the light source module by minimizing reflections and adjusting the vertical viewing angle, resulting in improved light output and distribution.
Implementation Method 1
the beam is transmitted toward the other end of the light guide plate by the principle of total reflection
Implementation Method 2
the beam reflected by the microstructure will diffuse at various angles, so that the total reflection condition and the interference of light are destroyed
Implementation Method 3
the first prism sheet includes a plurality of first prism units... the first prism units face a direction away from the light emitting surface
Data Source
AI summary
A light source module includes a light guide plate, a light source, a first prism sheet, a second prism sheet and a third prism sheet. The light guide plate includes a light emitting surface, a bottom surface and a light incident surface. The light source is disposed on the light incident surface and emits a beam into the light guide plate through the light incident surface. The first prism sheet is disposed on the light emitting surface and includes a plurality of first prism units located between the light emitting surface and the second prism sheet. The second prism sheet includes a plurality of second prism units extending in a first direction and located between the first prism sheet and the third prism sheet. The third prism sheet includes a plurality of third prism units extending in a second direction. The first direction is perpendicular to the second direction.