Light Guide Plate Micro Structures for Light Utility Rate
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Solution Overview
Problem
In liquid crystal display devices, light guide plates suffer from low light utility rates due to reflection of light back into the plate, preventing it from passing through the light emitting surface, which is exacerbated by the inability of light to penetrate beyond a critical angle of incidence.
Innovation Solution
A light guide plate with first micro structures protruding from the light emitting surface, gradually arranged inward from the light incident surface, and second micro structures recessing from the diffusion surface, arranged to reduce incident angles and enhance light penetration, combined with a structured arrangement of LED light sources for uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light is emitted through the light guide plate, then the display panel receives light, but much light generates reflection on the light emitting surface and returns into the light guide plate, causing low light utility rate
Solution Approach 1:
The patent changes the physical parameters of the light guide plate by introducing micro structures (protrusions and recesses) on the light emitting surface. These structures modify the local geometry to alter light reflection angles, converting total internal reflection into useful light output. This parameter change resolves the contradiction by reducing harmful reflection while maintaining light guidance functionality.
Solution Approach 2:
The patent employs curved micro structures (protrusions and recesses) instead of flat surfaces on the light emitting surface. These curved geometries refract and reflect light at multiple angles, preventing single-direction total reflection and enabling light to escape the light guide plate effectively. This curvature-based approach increases light utility rate while maintaining structural integrity.
2Loss of energy
If micro structures are added to the light guide plate to improve light penetration, then light utility rate increases, but the device complexity increases
Solution Approach 1:
The patent segments the light emitting surface into multiple micro structures (protrusions and recesses) distributed across the surface. This segmentation allows different regions to handle light differently, improving overall light penetration while maintaining a relatively simple monolithic light guide plate structure. The segmentation is achieved through molding rather than assembly, avoiding additional components.
Solution Approach 2:
The patent replaces complex mechanical light control mechanisms with optically active micro structures that are integrated into the light guide plate itself. Instead of using movable mirrors, lenses, or adjustable components, the fixed micro structures passively manipulate light paths through refraction and reflection, reducing mechanical complexity while achieving improved light utility.
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 significantly increases the penetration rate of light through the light emitting surface, improving the light utility rate by reducing total reflection and ensuring even light distribution across the display panel.
Implementation Method 1
much light is prone to generate reflection on a light emitting surface of the light guide plate and return into the light guide plate
Implementation Method 2
the first micro structures protrude from the light emitting surface... the first micro structures are gradually tightly arranged on the light emitting surface inwards from the light incident surface. Widths of the first micro structures gradually reduce inwards from the light incident surface
Implementation Method 3
second micro structures recessing from the diffusion surface, arranged to reduce incident angles and enhance light penetration
Data Source
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AI summary
The present application discloses a light guide plate (10) and a display device. The light guide plate (10) has a light emitting surface (11) configured to guide light out, the light emitting surface (11) is provided with first micro structures (110), and the first micro structures (110) protrude from the light emitting surface (11); the first micro structures (110) are gradually tightly arranged on the light emitting surface (11) inwards from the light incident surface (13); widths of the first micro structures (110) gradually reduce inwards from the light incident surface (13). Light passes through the first micro structures (110) protruding from the light emitting surface (11), an incident angle is reduced, so that the light is not prone to generate total reflection, a penetration rate of the light on the light emitting surface (11) of the light guide plate (10) is improved, and a light utility rate is increased.