Lens Array Sheet with Embedded Reflection for Moire Suppression
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in maintaining high image quality and reducing moire fringes due to the interference between the regular pixel patterns and structured patterns in the optical sheet, which is difficult to address with conventional lens array layers that also have regular patterns, leading to incomplete suppression of moire fringes.
Innovation Solution
A lens array sheet with a light diffusion layer and a light reflection portion embedded in the non-light focusing regions, which diffuses and reflects light to convert it into parallel light, reducing the impact of moire fringes by minimizing light not converted into parallel light and enhancing light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lens array layer with regular pattern is used to guide light, then front face brightness and viewing angle are improved, but moire fringes are produced due to overlapping with pixel patterns
Solution Approach 1:
The patent applies local quality by creating light reflection portions only in the non-light focusing regions of the lens array layer, while leaving the light focusing regions intact. This localized modification allows the lens to maintain its light-guiding function in focal regions while suppressing moire fringes in non-focal regions where regular patterns would otherwise interfere with pixel patterns.
Solution Approach 2:
The light diffusion layer acts as an intermediary between the lens array layer and the liquid crystal panel. It diffuses light in the non-focusing regions, converting the regular patterned light into diffuse light that does not create moire fringes, while still allowing the lens array to guide light effectively in the focusing regions.
2Object-generated harmful factors
If the array pitch of pixels is adjusted to minimize moire fringes, then visibility is improved, but design and manufacturing complexity of the liquid crystal panel increases
Solution Approach 1:
The patent segments the lens array layer into two distinct functional regions: light focusing regions that maintain regular patterns for effective light guiding, and non-light focusing regions with light reflection portions that suppress moire fringes. This segmentation allows each region to perform its specific function optimally without requiring changes to the overall pixel array design.
Solution Approach 2:
The patent converts the harmful regular pattern in non-focusing regions into a beneficial light-reflecting structure. By adding light reflection portions in these regions, the regular pattern that would otherwise create moire fringes is transformed into a feature that actively suppresses moire fringes by reflecting light back through the diffusion layer.
3Object-generated harmful factors
If a light diffusion layer is added to suppress moire fringes, then moire fringe production is reduced, but light use efficiency may be degraded
Solution Approach 1:
The light diffusion function is applied locally only in the non-light focusing regions through the light diffusion layer, while the light focusing regions maintain their original light-guiding properties. This localized application ensures that light diffusion occurs only where needed to suppress moire fringes, without degrading the overall light use efficiency of the lens array structure.
Solution Approach 2:
The light diffusion layer serves as an intermediary that selectively diffuses light in non-focusing regions while allowing focused light to pass through. This mediation ensures that light use efficiency is maintained for the primary light-guiding function while still achieving moire fringe suppression in the non-focusing regions.
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 effectively suppresses moire fringes while maintaining image quality and improving front face brightness and viewing angle, as demonstrated by the reduced production of moire fringes and enhanced light use efficiency in liquid crystal display devices.
Implementation Method 1
a light diffusion layer arranged at an opposite side to the lens surface of the lens layer, for diffusing light directing toward the lens layer
Implementation Method 2
a light reflection portion, which is embedded in at least a part of a non-light focusing region of the lens layer, for reflecting light passing through the non-light focusing region and directing toward the lens layer
Implementation Method 3
a lens layer having a lens surface on which a plurality of lenses are formed in an array... for converting light into parallel light
Data Source
AI summary
A lens array sheet includes a lens layer having a lens surface on which a plurality of lenses are formed in an array, and a light diffusion layer arranged at an opposite side to the lens surface of the lens layer, for diffusing light directing toward the lens layer, wherein the light diffusion layer has a light reflection portion, which is embedded in at least a part of a non-light focusing region of the lens layer, for reflecting light passing through the non-light focusing region and directing toward the lens layer.