Light-Shielding Portions with Low Duty Ratio for PDL Display Diffraction
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Solution Overview
Problem
Display devices using polymer dispersed liquid crystals face degradation in display quality due to diffraction patterns caused by the interaction of light with periodic patterns, which affects image clarity and visibility, especially when viewed from certain angles.
Innovation Solution
The implementation of a display device configuration with specific light-shielding portions arranged in particular directions and duty ratios less than or equal to 0.2, which minimizes diffraction patterns by optimizing the ratio of light-shielding to transmissive areas, thereby reducing diffraction efficiency and enhancing image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If periodic patterns are used in the display device structure, then manufacturing is simplified and structural regularity is achieved, but diffraction patterns occur that degrade display quality and image clarity
Solution Approach 1:
The patent applies asymmetry by configuring light-shielding portions with non-uniform pitch relationships. Specifically, the pitch between adjacent first light-shielding portions in the first direction is made different from the pitch between adjacent second light-shielding portions in the second direction. This asymmetric arrangement disrupts the periodicity that causes diffraction patterns while maintaining manufacturing simplicity through systematic design.
Solution Approach 2:
The patent implements local quality by varying the pitch of light-shielding portions in different regions and directions. The first light-shielding portions have a specific pitch in the first direction, while second light-shielding portions have a different pitch in the second direction. This local variation in pitch creates non-uniform light shielding characteristics that prevent diffraction while maintaining overall structural order.
2Object-affected harmful factors
If light-shielding portions are added to reduce diffraction patterns, then display quality improves, but the complexity of the device structure increases
Solution Approach 1:
The patent merges the light-shielding function with existing structural elements by configuring light-shielding portions that serve both as diffraction prevention mechanisms and as part of the overall display device structure. The first and second light-shielding portions are integrated into the substrate structure, combining multiple functions into a unified design that reduces overall complexity.
Solution Approach 2:
The patent segments the light-shielding structure into multiple discrete portions (first light-shielding portions in the first direction and second light-shielding portions in the second direction) with different pitches. This segmentation allows independent optimization of each portion's pitch to prevent diffraction while maintaining manufacturing simplicity through modular design.
3Object-affected harmful factors
If the pitch of light-shielding portions is reduced to minimize diffraction, then diffraction efficiency decreases, but the transmissive area and brightness are reduced
Solution Approach 1:
The patent uses asymmetry in pitch configuration where first light-shielding portions have a pitch optimized for preventing diffraction in the first direction, while second light-shielding portions have a different pitch optimized for the second direction. This asymmetric approach allows each direction to have optimal pitch values that balance diffraction prevention with light transmission, rather than using a uniform pitch that would compromise one direction.
Solution Approach 2:
The patent applies local quality by assigning different pitch values to light-shielding portions in different directions and regions. The pitch of first light-shielding portions is locally optimized for the first direction, while the pitch of second light-shielding portions is locally optimized for the second direction, allowing maximum light transmission in each direction while preventing diffraction patterns.
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 effectively prevents the degradation of display quality by minimizing the visibility of diffraction patterns, ensuring high transparency and image clarity even when viewed from different angles, with desirable duty ratios less than or equal to 0.2 significantly reducing iridescent unevenness and maintaining high transmittance.
Implementation Method 1
a display device using a polymer dispersed liquid crystal which can switch the state between a scattered state for scattering incident light and a transmissive state for transmitting incident light
Implementation Method 2
Display devices using polymer dispersed liquid crystals face degradation in display quality due to diffraction patterns caused by the interaction of light with periodic patterns
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate, a liquid crystal layer located between the first substrate and the second substrate and containing a polymer and a liquid crystal molecule, and a light emitting module provided along a side surface of the second transparent substrate. At least one of the first substrate and the second substrate includes first light-shielding portions arranged in a first direction. When a width of each of the first light-shielding portions in the first direction is defined as Lx, and an interval of the adjacent first light-shielding portions in the first direction is defined as Sx, a duty ratio Dx shown by Lx/(Sx+Lx) is less than or equal to 0.2.