Light Guide Plate Elongated Microstructures Brightness Distribution
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Solution Overview
Problem
Conventional light guide plates with microstructures suffer from low luminous efficiency due to uneven light distribution, particularly along the direction x, where the brightness is higher at the middle position and lower at the fringes, leading to light energy loss and inability to concentrate light effectively.
Innovation Solution
The light guide plate features elongated microstructures with adjustable curve parameters such as curvature radius, arc length, tangential edge angle, base angle, width, or height, which are varied symmetrically or discontinuously along the extending direction to adjust brightness distribution, allowing for higher brightness at the middle position and lower brightness at the fringes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional light guide plate with microstructures is used, then manufacturing cost is reduced and production speed is increased, but luminous efficiency is low due to uneven light distribution
Solution Approach 1:
The patent applies local quality by varying the curve parameters (curvature radius, arc length, tangential edge angle, base angle, width, or height) of elongated microstructures at different positions along the extending direction. This allows different regions of the light guide plate to have different light extraction characteristics, concentrating light at the middle position while reducing extraction at fringe positions, thereby improving luminous efficiency without changing the overall microstructure approach
Solution Approach 2:
The patent implements parameter changes by systematically altering at least one curve parameter of the elongated microstructures according to position variation in the extending direction. This enables continuous or discontinuous adjustment of brightness distribution along the light guide plate, optimizing light utilization while maintaining the microstructure manufacturing approach
2Ease of manufacture
If conventional light guide plate with uniform microstructures is used, then manufacturing process is simplified, but brightness distribution cannot be adjusted according to user requirements
Solution Approach 1:
The patent maintains ease of manufacture by continuing to use elongated microstructures while applying local quality through position-dependent curve parameter variations. This allows the manufacturing process to remain relatively simple while achieving customizable brightness distributions that adapt to different user requirements for middle-position enhancement or fringe-position compensation
Solution Approach 2:
The patent introduces dynamics by making the microstructure curve parameters variable rather than fixed, allowing the brightness distribution to be dynamically adjusted according to different application scenarios. The parameters can be varied continuously or discontinuously to achieve different lighting effects while using the same basic microstructure manufacturing approach
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 adjustment enhances luminous efficiency by optimizing light distribution, ensuring uniform illumination and increasing the utilization rate of light, allowing for customizable brightness profiles to meet user requirements.
Implementation Method 1
a plurality of elongated microstructures disposed on one side which is opposite to a light-emitting surface of the light guide plate, and parallel to the light-incident surface
Implementation Method 2
the light guide plate has scattering patterns or microstructures
Data Source
AI summary
The present invention provides a light guide plate and a backlight module. The backlight module comprises the light guide plate. The light guide plate comprises a plurality of elongated microstructures disposed on the light guide plate and parallel to a light-incident surface thereof. At least one curve parameter of profiles of the elongated microstructures is altered according to a position variation in an extending direction of the elongated microstructures, so as to adjust a brightness distribution in the extending direction of the elongated microstructures. The invention can improve a luminous efficiency of the light guide plate.