Lightguide Plate Light Control Grooves for Display Contrast
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Solution Overview
Problem
Current light-emitting modules for liquid crystal display devices face challenges in achieving a high contrast ratio between lit and non-lit areas, as existing techniques do not effectively control light distribution and absorption between adjacent light-emitting regions.
Innovation Solution
A light-emitting module design featuring a lightguide plate with strategically placed light sources and light control grooves that refract or reflect light to prevent illumination overlap between adjacent regions, enhancing contrast by directing light emission and absorption patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If light sources are arranged in adjacent light source placement sections, then the illuminated area is expanded, but light leakage between adjacent regions occurs and contrast ratio deteriorates
Solution Approach 1:
The lightguide plate is segmented into multiple light source placement sections by light control grooves. These grooves physically divide the plate into distinct regions, allowing light from adjacent light sources to be contained within their respective sections. This segmentation prevents light leakage between regions while maintaining expanded illumination coverage through the array of multiple sections.
Solution Approach 2:
Light control grooves serve as intermediary structures between adjacent light source placement sections. These grooves act as optical barriers that mediate the interaction between light from different sources, preventing direct light leakage while allowing each section to maintain its illumination. The grooves are strategically positioned to block light paths between adjacent regions.
2Illumination intensity
If light control grooves are added to prevent light leakage, then contrast ratio is improved, but device complexity increases
Solution Approach 1:
The light control grooves are designed with optimized parameters including depth, width, and spacing to achieve effective light control. By carefully adjusting these geometric parameters, the grooves provide sufficient light blocking capability to improve contrast ratio while minimizing the overall structural complexity. The parameters are tuned to achieve the desired optical effect with the simplest possible groove geometry.
3Area of stationary object
If multiple light sources are arranged closely to reduce module size, then compactness is improved, but light distribution control becomes difficult
Solution Approach 1:
Instead of controlling light distribution only in the horizontal plane, the solution introduces vertical dimension control through light control grooves with specific depths. The grooves extend downward into the lightguide plate, creating optical barriers in the vertical dimension that effectively segment light paths. This dimensional approach allows compact horizontal arrangement while maintaining precise light distribution control through the vertical groove structures.
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 improves the contrast ratio between lit and non-lit areas by effectively managing light distribution, reducing brightness variations and preventing light leakage between adjacent regions, thereby enhancing overall display performance.
Implementation Method 1
light control grooves that refract or reflect light to prevent illumination overlap between adjacent regions
Implementation Method 2
light control grooves that refract or reflect light to prevent illumination overlap between adjacent regions
Data Source
AI summary
A light-emitting module includes: a plurality of light sources; and a lightguide plate including a plurality of light source placement sections, in each of which at least one light source is arranged, arrayed in a first direction and a second direction orthogonal to the first direction. The lightguide plate defines at least one first-A light control groove and at least one first-B light control groove that extend parallel to the second direction between a first light source placement section and a second light source placement section adjacent to the first light source placement section in the first direction, and at least one second-A light control groove and at least one second-B light control groove that extend parallel to the first direction between the first light source placement section and a third light source placement section adjacent to the first light source placement section in the second direction.