Backlight Module Light Guide Plate Prismatic Structures Brightness
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Solution Overview
Problem
Conventional printed light guide plates in LCD backlight modules limit the achievement of high brightness due to inefficient light utilization, leading to uneven brightness across the display device.
Innovation Solution
A backlight module with a light guide plate featuring prismatic structures and a brightness enhancement film, where the prismatic structures on the light guide plate ensure light beams enter the brightness enhancement film at an optimum incident angle, enhancing light utilization efficiency and uniform brightness across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a printed light guide plate is employed, then the structure is simple and easy to manufacture, but the light utilization efficiency is low and brightness is limited
Solution Approach 1:
The patent changes the surface structure parameters of the light guide plate by introducing prismatic structures with specific geometric parameters (refractive angles, ridge orientations) to optimize light extraction efficiency. This transforms the conventional flat printed surface into a micro-structured surface that controls light propagation angles, thereby increasing brightness while maintaining manufacturing feasibility through injection molding or embossing processes.
Solution Approach 2:
The patent employs curved prismatic structures with specific refractive angles instead of flat surfaces. The prismatic structures feature inclined surfaces and ridges that create controlled light refraction and reflection, optimizing the light extraction pattern to achieve uniform brightness distribution across the display panel.
2Ease of manufacture
If conventional light guide plate design is used, then manufacturing is straightforward, but light beams do not enter the brightness enhancement film at the optimum incident angle
Solution Approach 1:
The patent optimizes the geometric parameters of the prismatic structures, specifically the refractive angles and ridge orientations, to control the incident angle of light beams entering the brightness enhancement film. By precisely designing these angular parameters, the system achieves optimal light coupling efficiency without requiring complex manufacturing processes.
Solution Approach 2:
The patent introduces localized prismatic structures at specific regions of the light guide plate where light extraction is needed. These structures create localized control over light propagation angles, ensuring that light beams enter the brightness enhancement film at the optimum incident angle in critical areas while maintaining simple manufacturing elsewhere.
3Ease of manufacture
If printed light guide plate is employed, then manufacturing is simple, but brightness uniformity across the display device is poor
Solution Approach 1:
The patent employs prismatic structures with curved inclined surfaces that refract light at controlled angles. The geometric configuration of these prisms, with specific refractive angles and ridge patterns, creates uniform light distribution across the entire display surface by redirecting light beams from the edge-mounted LED source evenly across the panel.
Solution Approach 2:
The patent divides the light guide plate surface into multiple prismatic units with ridges oriented in different directions. This segmentation allows different regions to control light extraction in specific directions, achieving overall uniform brightness distribution across the display device while maintaining a relatively simple manufacturing process.
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 brightness of LCD panels by optimizing light distribution and meeting TCO 03 standards for display devices by ensuring no brightness difference between the left and right sides.
Implementation Method 1
The first surface has prismatic structures disposed side by side thereon. Each of the prismatic structures includes a first slope and a second slope being adjacent to each other and each having an included angle with respect to the first surface. The light beam exiting the light guide plate enters the brightness enhancement film at the optimum incident angle of the brightness enhancement film.
Data Source
AI summary
A backlight module having a light guide plate with prismatic structures and a manufacturing method thereof are provided. The backlight module includes a light guide plate, a brightness enhancement film, and a light source module. The light guide plate includes a first surface and a second surface opposite to each other. The first surface has prismatic structures disposed side by side thereon. Each of the prismatic structures includes a first slope and a second slope being adjacent to each other and having an included angle with respect to the first surface, respectively. The included angles are equivalent. The brightness enhancement film includes a third surface and a fourth surface opposite to each other. The third surface faces the second surface. The fourth surface has prisms disposed side by side thereon along the extending direction of the prismatic structure. The brightness enhancement film has an optimum incident angle associated with an angle of the prism and corresponding to the included angles. The light source module is disposed beside the light guide plate along the extending direction of the prismatic structure.