Backlight Unit Light Guide Plate Groove Design for Uniform Illumination
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Solution Overview
Problem
Backlight units for LCDs using LEDs suffer from non-uniform light guidance, leading to hot spots and dark regions due to the absence of effective light distribution mechanisms.
Innovation Solution
The implementation of a backlight unit design featuring a light guide plate with first and second grooves, where the second grooves are strategically positioned between light source groups and circuit boards to refract and distribute light uniformly, reducing hot spots and dark regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are used for the backlight unit, then power consumption is reduced and color reproduction is improved, but light distribution becomes non-uniform causing hot spots and dark regions
Solution Approach 1:
The patent applies local quality by creating different groove structures at different locations on the light guide plate. First grooves are formed along the light source groups to guide light in the first direction, while second grooves are formed in regions between light source groups to guide light in the second direction. This localized structural variation ensures uniform light distribution across different areas of the display panel, preventing hot spots and dark regions while maintaining the energy efficiency of LED backlighting.
Solution Approach 2:
The patent introduces a second directional dimension for light guidance by forming second grooves that extend in a direction different from the first grooves. While first grooves guide light primarily in one direction along the light source groups, the second grooves add a perpendicular or angled component, redirecting light from regions between light source groups. This multi-directional approach creates comprehensive light coverage and uniformity across the display area.
2Ease of manufacture
If simple light guide plate structure is used, then manufacturing is easier, but light guidance is non-uniform causing hot spots and dark regions
Solution Approach 1:
The patent implements local quality by forming different groove patterns in different regions of the light guide plate. First grooves are created along the light source groups to manage light in those areas, while second grooves are created in the spaces between light source groups to address light distribution in those regions. This region-specific groove configuration achieves uniform light guidance without requiring complex additional optical components, maintaining manufacturing simplicity while improving light uniformity.
Solution Approach 2:
The light guide plate serves multiple functions through its dual groove system. The first grooves guide and distribute light along the light source groups, while the second grooves simultaneously guide light from the regions between light source groups. This multi-functional groove structure within a single light guide plate achieves comprehensive light distribution uniformity without requiring separate optical components for different regions, simplifying the overall 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
This design effectively collects and refracts light from adjacent light source groups, enhancing light distribution and reducing hot spots and dark regions, thereby improving the overall image quality.
Implementation Method 1
a light guide plate to guide light irradiated from the plurality of light source groups
Data Source
AI summary
The backlight unit includes a plurality of light source groups, each of which includes at least one light source, and a light guide plate to guide light irradiated from the plurality of light source groups, and the light guide plate includes first grooves disposed in a first direction, the plurality of light source groups being disposed within the first grooves, and at least one second groove disposed in a second direction differing from the first direction.