Light Guide Plate V-Groove Reflection Surface for Backlight Uniformity
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Solution Overview
Problem
Existing edge-light type backlight systems for liquid crystal displays face challenges in achieving balanced viewing angle characteristics, luminance uniformity, and dimming characteristics, often requiring multiple expensive prism sheets and complex assembly.
Innovation Solution
A light guide plate with a reflection surface featuring alternating V-shaped grooves of two or more cross-sectional shapes, optimized to direct both direct and reflected light efficiently, reducing the need for multiple prism sheets and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple prism sheets are used to achieve balanced viewing angle characteristics and luminance uniformity, then optical performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple prism sheet functions into a single light guide plate by forming different types of prisms (first prisms with smaller apex angles and second prisms with larger apex angles) directly on the reflection surface of the light guide plate. This integration eliminates the need for separate prism sheets while achieving both viewing angle control and luminance uniformity
Solution Approach 2:
The light guide plate serves multiple functions simultaneously: it guides light from the light source, reflects light through the reflection surface, and provides viewing angle control through the different prism types. This multi-functionality reduces the overall number of components needed in the display device
2Illumination intensity
If multiple prism sheets are used to improve dimming characteristics, then optical performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates dimming control functionality into the light guide plate itself by forming specific prism patterns on the reflection surface. This eliminates the need for separate dimming control sheets, reducing material costs and assembly complexity
Solution Approach 2:
The patent applies different prism types at different locations on the reflection surface - first prisms in certain regions and second prisms in other regions. This localized optimization achieves uniform dimming characteristics across the display while using cost-effective single-sided formation processes
3Illumination intensity
If multiple prism sheets are used to achieve balanced viewing angle characteristics, then optical performance is improved, but assembly complexity increases
Solution Approach 1:
The patent merges viewing angle control functionality into the light guide plate by forming different apex angle prisms directly on its reflection surface. This eliminates the need to assemble multiple separate prism sheets, significantly simplifying the assembly process
Solution Approach 2:
The patent segments the prism structures into different types (first prisms with smaller apex angles and second prisms with larger apex angles) that are formed in different regions of the reflection surface. This segmentation allows each prism type to optimize specific viewing angle characteristics while being integrated into a single component
4Illumination intensity
If complex multiple prism sheet structures are used, then luminance uniformity is improved, but local non-uniformity problems persist
Solution Approach 1:
The patent applies different prism types in different regions of the reflection surface to address local optical characteristics. First prisms with smaller apex angles are formed in regions requiring one type of light distribution, while second prisms with larger apex angles are formed in regions requiring different distribution patterns, achieving uniform luminance across the entire display surface
Solution Approach 2:
The patent changes the apex angle parameter of the prisms to optimize light distribution - using smaller apex angles for first prisms and larger apex angles for second prisms. This parameter variation allows precise control over light reflection angles to eliminate local non-uniformity while maintaining overall luminance uniformity
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 enhances viewing angle characteristics, increases front luminance, and improves dimming characteristics, achieving uniform luminance distribution and reduced local non-uniformity while reducing component complexity and cost.
Implementation Method 1
a propagating reflection surface which is a surface opposite to the emitting surface and which propagates and reflects light incident from the incident surface toward the emitting surface
Data Source
AI summary
A light source device including a light guide plate and a light source, in which the light guide plate includes an incident surface on which light emitted from the light source is incident, an emission surface emitting light incident from the incident surface, and a propagating reflection surface which is a surface opposite to the emission surface and which propagates and reflects the light incident from the incident surface toward the emission surface, the propagating reflection surface has approximately V-shaped grooves and the V-shaped grooves have two kinds of grooves.