Light Guiding Plate V-Grooves for Backlight Uniformity
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Solution Overview
Problem
Conventional light guiding plates in backlight modules suffer from non-uniform brightness due to limited light emission angles of LEDs, resulting in dark and bright regions, which fails to meet high-quality requirements for liquid crystal displays.
Innovation Solution
The light guiding plate incorporates first and second V-shaped grooves on its incident surface to increase the range of incident angles and enhance light uniformity, utilizing these grooves to improve brightness and output uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional edge type backlight module with LEDs is used, then energy consumption is reduced and service life is extended, but light output uniformity deteriorates due to limited emission angles creating dark and bright regions
Solution Approach 1:
The light guiding plate incorporates different types of grooves (first grooves and second grooves) at different locations on its incident surface. The first grooves are positioned to receive light from LEDs and convert it to wide-angle emission, while the second grooves are positioned in dark regions to supplement light. This local differentiation of groove types and positions creates uniform light distribution across the entire light emitting surface, resolving the uniformity problem while maintaining LED energy efficiency.
2Ease of manufacture
If conventional light guiding plate with single groove type is used, then manufacturing is simplified, but light uniformity deteriorates due to inability to compensate for LED limited emission angles
Solution Approach 1:
The incident surface of the light guiding plate is segmented into different regions with different groove configurations. First grooves are placed in regions where LEDs emit light, while second grooves are placed in dark regions between LEDs. This segmentation allows each groove type to perform its specific function optimally, achieving uniform light distribution without significantly complicating the manufacturing process.
3Device complexity
If LEDs with limited emission angles are used, then device complexity is reduced, but brightness uniformity deteriorates creating dark regions between adjacent LEDs
Solution Approach 1:
The light guiding plate acts as an intermediary between the LEDs and the liquid crystal display. The grooves on the incident surface of the light guiding plate serve as optical mediators that convert the narrow-angle LED emission into wide-angle light distribution. This intermediary structure enables uniform brightness across the display without requiring complex LED arrangements or additional optical components.
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 high brightness and uniformity of light output, addressing the non-uniformity issues in conventional backlight modules and enhancing the performance of liquid crystal displays.
Implementation Method 1
the first grooves being configured for increasing a range of incident angles in which light beams enter the light guiding plate
Implementation Method 2
the second grooves being configured for complementing the functions of the first grooves thereby improving a uniformity of light output
Data Source
AI summary
A light guiding plate (120) includes a light incident surface (121), a light emitting surface (122) adjacent to the light incident surface, and a bottom surface (123) opposite to the light emitting surface. The light incident surface includes at least one row of first grooves (1211) and at least one row of second grooves (1212). The first grooves is configured for increasing a range of incident angles in which light beams enter the light guiding plate via the light incident surface and thereby improving a brightness of the light guiding plate, and the second grooves is configured for complementing the functions of the first grooves thereby improving a uniformity of light output by the light guiding plate.