Anisotropic Light-Diffusing Member for Moire Reduction
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Solution Overview
Problem
Liquid crystal display devices with light-diffusing members having non-random light shielding layers arrangements interfere with pixel pitch, causing moire interference fringes and decreased display characteristics.
Innovation Solution
A display device with a substrate having light transmissivity, light shielding layers formed at a recurring period, and a light-diffusing unit with a larger incident end face area than the emitting end face, where the light-diffusing unit's height exceeds the shielding layer thickness, and the periodic direction of the shielding layers is non-parallel to the pixel pitch, forming an anisotropic light-diffusing member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light shielding layers are arranged in a regular periodic pattern on the substrate, then the light-diffusing member can be manufactured with precise structure and controlled light diffusion, but the periodic arrangement interferes with the pixel pitch of the liquid crystal panel, causing strong moire interference fringes and decreased display characteristics
Solution Approach 1:
The patent introduces asymmetric elements into the periodic structure of light shielding layers. Specifically, the light shielding layers have different widths (first width and second width) alternating in a periodic pattern, creating an asymmetric periodic structure. This asymmetry disrupts the regular interference pattern that causes moire fringes, while maintaining the periodic arrangement for manufacturability. The asymmetric design allows the structure to diffuse light effectively without creating strong periodic interference with the pixel pitch.
Solution Approach 2:
The patent applies local quality by varying the properties of light shielding layers at different positions within the periodic structure. Different regions have different light shielding layer widths, creating localized variations in light diffusion characteristics. This local variation prevents uniform interference patterns across the entire display area, thereby reducing the visibility of moire interference fringes while maintaining overall structural regularity for ease of manufacture.
2Device complexity
If the light-diffusing unit has a small height, then the manufacturing process is simpler and the structure is more compact, but the light diffusion effect is insufficient to reduce moire interference fringes effectively
Solution Approach 1:
The patent optimizes the height parameter of the light-diffusing unit to achieve effective light diffusion without excessive structural complexity. By carefully selecting the height within a specific range (greater than the thickness of the light shielding layer but not excessively large), the patent achieves sufficient light diffusion to reduce moire interference fringes. This parameter optimization balances the trade-off between structural simplicity and functional effectiveness.
Solution Approach 2:
The patent utilizes the vertical dimension (height) of the light-diffusing unit as an additional degree of freedom to enhance light diffusion. By extending the structure in the vertical direction rather than increasing lateral dimensions or complexity, the patent achieves improved light diffusion capability. The height dimension provides an effective means to control light diffusion strength without complicating the overall structural design.
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 configuration reduces the visibility of moire interference fringes, thereby improving the display's visibility and characteristics by minimizing interference patterns.
Implementation Method 1
a light-diffusing unit that is formed in an area on the one face of the substrate except for the area where the light shielding layers are formed
Implementation Method 2
a plurality of light shielding layers that is formed at a recurring period on one face of the substrate
Data Source
AI summary
Provided is a display device including a substrate that has light transmissivity, a plurality of light shielding layers that is formed at a recurring period on one face of the substrate, and a light-diffusing unit that is formed in an area of the one face of the substrate except for the area where the light shielding layers are formed, in which the light-diffusing unit includes a light emitting end face on the substrate side and includes a light incident end face having an area larger than the area of the light emitting end face on the side opposite to the substrate side, the height of the light-diffusing unit from the light incident end face to the light emitting end face is greater than the thickness of the light shielding layer, and the periodic direction at which the light shielding layers are recurrently formed is non-parallel to the direction of a pixel pitch of a display body.