Backlight Module Viewing Angle Convergence Structure
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Solution Overview
Problem
Conventional edge-lit backlight modules are unable to effectively increase light-emitting brightness and suffer from an inability to converge light-emitting angles, resulting in reduced brightness and contrast due to the configuration of optical films, which also makes them thick.
Innovation Solution
A backlight module incorporating a light guide plate with a viewing angle convergence structure, a prism plate with cross-oriented first and second prism columns, and an inverse prism plate with differently angled third prism columns, which effectively converges the light-emitting viewing angle and reduces the number of optical films needed, allowing for improved brightness and contrast while maintaining a thin design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If many optical films are configured in the light-emitting direction of the light guide plate to increase light-emitting brightness, then the brightness is improved, but the thickness of the backlight module increases
Solution Approach 1:
The patent combines multiple optical functions into a single integrated light guide plate structure. The light guide plate integrates the viewing angle convergence structure, light distribution control, and brightness enhancement functions that would traditionally require separate optical films, thereby reducing the overall thickness while maintaining brightness improvement
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: it guides light from the edge, converges viewing angles through the prism structure, controls light distribution, and enhances brightness. This multi-functionality eliminates the need for multiple separate optical films, resolving the contradiction between brightness enhancement and thickness reduction
2Illumination intensity
If conventional optical films are configured to increase light-emitting brightness, then the brightness is improved, but the light-emitting angle cannot be effectively converged, resulting in insignificant effect
Solution Approach 1:
The light guide plate incorporates a viewing angle convergence structure with prism columns that have specific geometric configurations. These local structural features are designed to converge light rays at specific angles, creating localized optical control that effectively narrows the viewing angle while enhancing brightness in the forward direction
Solution Approach 2:
The patent changes the optical parameters of the light guide plate by incorporating a viewing angle convergence structure with specific prism geometries. This structural modification alters the light propagation parameters, enabling effective convergence of light-emitting angles and improving the directional brightness control
3Length of moving object
If the backlight module is designed to be thin by reducing optical films, then the thickness is reduced, but the light-emitting brightness cannot be effectively increased
Solution Approach 1:
The patent transitions from using multiple thin optical films stacked in one dimension to a single light guide plate with three-dimensional prism structures. This dimensional change allows the plate to achieve optical enhancement functions through its volumetric geometry rather than through multiple layered surfaces, maintaining thinness while improving brightness
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 proposed solution effectively converges the light-emitting viewing angle, enhancing brightness and contrast, and reduces the thickness of the backlight module by utilizing fewer optical films, while ensuring uniform light emission and minimizing stray light.
Implementation Method 1
a light beam generated by the light-emitting element can be led by the light guide plate to emit from a light-exiting surface close to the display panel
Implementation Method 2
the viewing angle convergence structure is located at the surface... effectively converges the light-emitting viewing angle
Implementation Method 3
the prism plate has a plurality of first prism columns and a plurality of second prism columns... the inverse prism plate has a plurality of third prism columns
Data Source
AI summary
A backlight module includes the following features. A light guide plate has a viewing angle convergence structure, a light-incident surface and a surface connected to the light-incident surface. The viewing angle convergence structure is located at the surface. The prism plate has first prism columns and second prism columns disposed cross to each other. The inverse prism plate has third prism columns respectively having a first side surface and a second side surface. The first side surface and the second side surface are connected to each other and are respectively connected to the second surface. The first side surface faces a side of the backlight module with the light-emitting element, and the second side surface faces away from the side. An included angle between the first side surface and the second surface is larger than an included angle between the second side surface and the second surface.