Backlight Module Light Guide Plate Corner Design
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Solution Overview
Problem
The challenge in designing a backlight module using LEDs is achieving high luminance and uniformity while maintaining a lightweight and thin form factor, as high-power LEDs required for corner placement face difficulties in heat dissipation and integration with the light guide plate.
Innovation Solution
The design incorporates a light guide plate with a chamfering plane and a cambered surface between intersecting side surfaces, allowing for efficient light transmission and reflection, which enhances optical efficiency and uniformity, and includes LEDs disposed at the corners to achieve the desired light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-power LEDs are used to achieve sufficient luminance at corner placement, then the luminance requirement is met, but the LED size increases making it difficult to dispose at the corner and heat dissipation problems worsen
Solution Approach 1:
The patent applies local quality by creating a specialized chamfering structure at the corner region of the light guide plate where the LED is disposed. This chamfering plane with specific angles (45-60 degrees) is localized to the light incident area, allowing concentrated light transmission to the corner while the rest of the plate maintains its optical properties. This resolves the contradiction by enabling high luminance at the corner without requiring larger high-power LEDs that would generate excessive heat.
Solution Approach 2:
The patent changes optical parameters by introducing a chamfering plane with specific angle ranges (45-60 degrees) and a cambered surface with controlled curvature radius (0.5-2mm). These parameter changes optimize light transmission efficiency to the corner region, allowing the use of smaller, lower-power LEDs that generate less heat while still achieving the required luminance output.
2Ease of manufacture
If fewer LEDs are used to reduce cost and maintain thin design, then manufacturing cost and thickness are reduced, but achieving the same luminance effect becomes more difficult
Solution Approach 1:
The patent introduces a cambered surface (curved surface) between the light incident surface and the first side surface of the light guide plate. This curved surface with a specific radius of curvature (0.5-2mm) optimizes light distribution and transmission paths, maximizing the luminance effect from fewer LEDs. The curvature helps spread and uniformize the light output, achieving the same visual effect as multiple LEDs would provide.
Solution Approach 2:
The patent adds dimensional complexity by introducing a chamfering plane at the corner and a cambered surface in the light transmission path. These three-dimensional structural modifications optimize light propagation in multiple directions, enabling fewer LEDs to achieve uniform luminance distribution across the display area that would otherwise require multiple LEDs.
3Length of stationary object
If the LED is disposed at the corner of the light guide plate to achieve light and thin design, then the product thickness is reduced, but the luminance uniformity deteriorates due to difficult light distribution
Solution Approach 1:
The patent segments the light guide plate structure into distinct functional zones: a chamfering plane at the corner for concentrated light entry, a cambered surface for light distribution, and a flat light reflection surface for uniform light output. This segmentation allows the corner LED placement to be optimized for thin design while the segmented optical paths ensure uniform luminance distribution across the display area.
Solution Approach 2:
The patent employs asymmetric结构设计 with a chamfering plane at the corner (asymmetric to the main plate surface) and a cambered surface with specific curvature. This asymmetric design optimizes light transmission from the corner LED position, creating balanced luminance distribution despite the asymmetric LED placement, thus maintaining uniformity while enabling thin corner-mounted design.
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 configuration increases light transmission efficiency and uniformity, preventing mura effects and ensuring that the backlight module maintains a desirable optical performance while adhering to the trend of lightweight and thin designs.
Implementation Method 1
The light source is disposed next to the light incident surface, so as to transmit light into the light guide plate through the light incident surface
Implementation Method 2
The light reflection surface is a cambered surface connected between the first side surface and the light incident surface
Data Source
AI summary
A backlight module including a light guide plate and a light source is provided. The light guide plate has a light incident surface, a light reflection surface, a first side surface and a second side surface. The light incident surface is connected to the second side surface. The reflection surface is connected between the first side surface and the light incident surface. The first and the second side surfaces are two planes with their extending planes intersected. The light incident surface is a chamfering plane connected between the first and the second side surfaces. The light reflection surface is a cambered surface connected between the first side surface and the light incident surface. The light source is disposed next to the light incident surface, so as to transmit light into the light guide plate through the light incident surface.