Light Condensing Light Guide Plate with Protrusions and Grooves
Solution Overview
Problem
Conventional backlight modules with multiple optical films and light guide plates are limited by high production costs and thickness, and struggle to efficiently direct light emission while minimizing stray light.
Innovation Solution
A light condensing light guide plate with protrusion structures and grooves is used, which reduces the light emission angle range and adjusts the main light-emitting direction, effectively suppressing stray light and enhancing brightness without the need for multiple optical films, thereby reducing production costs and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional backlight modules use multiple optical films (brightness enhancement films and diffusion sheets) to guide light beams, then the light intensity near the front viewing angle is improved, but the module thickness increases and production cost becomes high
Solution Approach 1:
The patent combines the functions of multiple optical films (brightness enhancement films and diffusion sheets) into a single integrated light guide plate with a complex 3D microstructure. The microstructure includes protrusions with inclined surfaces and cavities that perform both light redirection and diffusion functions that previously required separate layers, thereby reducing overall thickness while maintaining optical performance.
Solution Approach 2:
The patent transitions from a 2D planar optical film structure to a 3D microstructured surface. The light guide plate features protrusions with inclined surfaces and internal cavities that create three-dimensional light control, enabling the single component to achieve the light guiding and diffusion effects of multiple 2D films stacked together.
2Illumination intensity
If conventional backlight modules use multiple optical films to enhance brightness, then the light emission uniformity is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent merges multiple optical films into a single light guide plate with integrated microstructures. The complex 3D geometry including protrusions, inclined surfaces, and cavities performs multiple optical functions (light redirection, diffusion, and uniformity control) that previously required separate film layers, thereby reducing device complexity while maintaining light emission uniformity.
Solution Approach 2:
The light guide plate employs locally varied microstructures with different geometries, orientations, and distributions across its surface. This local quality variation enables different regions to control light in specific directions, achieving uniform light emission across the entire display area while using a single integrated component rather than multiple uniform films.
3Illumination intensity
If conventional backlight modules use multiple optical films to control light direction, then the viewing angle performance is improved, but the production cost becomes high
Solution Approach 1:
The patent combines the light direction control functions of multiple optical films into a single light guide plate with microstructures. The protrusions with specific inclined surfaces and internal cavities redirect light at controlled angles, achieving the viewing angle performance of multiple films while simplifying the component stack and reducing production costs associated with assembling and aligning multiple separate films.
4Ease of manufacture
If the light guide plate uses a simple flat structure, then the manufacturing is simple, but the light emission angle range is large and stray light is generated
Solution Approach 1:
The patent replaces the simple flat structure with a microstructured surface featuring curved inclined surfaces on protrusions and cavity geometries. These curved and angled surfaces redirect light at specific angles, confining the light emission angle range and preventing stray light generation, while the overall manufacturing process remains compatible with standard injection molding techniques.
5Illumination intensity
If the light guide plate uses protrusion structures with grooves, then the light condensing angle is reduced and brightness is enhanced, but the manufacturing precision requirement increases
Solution Approach 1:
The patent implements protrusion structures with grooves and inclined surfaces that provide precise light control in the critical viewing direction, while accepting that manufacturing precision requirements are concentrated in these specific features. The design focuses precision requirements on the light-condensing functional elements rather than the entire component, making high precision achievable through targeted manufacturing processes.
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 light emission uniformity and brightness while reducing production costs and module thickness, comparable to conventional brightness enhancement backlight modules.
Implementation Method 1
The protrusion structures include two side surfaces and are disposed along the first direction and extend toward the second direction... each of the protrusion structures has a light condensing angle along the first direction, the light condensing angle ranges from 10 degrees to 40 degrees, and the light condensing angle is an angle range corresponding to a half-height width of a light emission distribution of each of the protrusion structures
Implementation Method 2
The grooves are disposed in the protrusion structures of the light condensing light guide plate. The grooves are disposed along the second direction and extend toward the first direction, and the grooves are connected to the corresponding side surfaces... effectively suppressing the stray light generated by the backlight module
Data Source
AI summary
A light guide plate including a light emitting surface, a bottom surface, a light incident surface, multiple protrusion structures, and multiple grooves is provided. The light incident surface is connected between the light emitting surface and the bottom surface. The protrusion structures are disposed along a first direction and extend toward a second direction. The protrusion structures have a light condensing angle along the first direction, and the light condensing angle ranges from 10 degrees to 40 degrees. The grooves are disposed in the protrusion structures of the light guide plate. The grooves extend toward the first direction. The protrusion structures have a light receiving surface that defines each groove and is closer to the light incident surface. An angle between the light receiving surface and the bottom surface ranges from 35 degrees to 65 degrees. A display apparatus adopting the light guide plate is also provided.