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KR-102962057-B1 - Substrate

KR102962057B1KR 102962057 B1KR102962057 B1KR 102962057B1KR-102962057-B1

Abstract

The present application provides a substrate comprising a substrate layer and a spacer pattern formed on the substrate layer. The present application provides a substrate that can be applied to various optical devices to ensure uniform and excellent optical performance without causing unnecessary diffraction phenomena. Furthermore, the substrate of the present application can be applied to an optical device to maintain a stable and uniform spacing between substrates. The present application also provides an optical device comprising the substrate.

Inventors

  • 서한민
  • 김민준
  • 김진홍
  • 박영진
  • 이승헌

Assignees

  • 주식회사 엘지화학

Dates

Publication Date
20260507
Application Date
20211209

Claims (14)

  1. A substrate comprising a substrate layer; and a spacer pattern formed on the substrate layer, The standard deviation of the lengths of the width, height, and left and right diagonals of the white image of a black and white image obtained by transmitting LED light of a wavelength of 550 nm through the above substrate is 80 or less, and The above spacer pattern includes a bulkhead spacer which is a non-linear line-type spacer satisfying the following Equation 1, and The average of X in Formula 1 below is within the range of 10 μm to 200 μm, and The standard deviation of the above X is within the range of 0.5 μm to 5 μm, and The pitch between the above non-linear linear spacers is within the range of 100 μm to 600 μm, and A substrate in which the above spacer pattern comprises only the above non-linear linear spacer, or comprises the above non-linear linear spacer and a bridge connecting adjacent above non-linear line spacers: [Equation 1] 250 ≤ L 1 /X ≤ 1000 In Equation 1, L1 is the length of a straight line connecting both ends of the non-linear linear spacer, and X is the distance between two straight lines parallel to the straight line of length L1 , which are in contact with the most protruding parts in the left and right directions of the non-linear linear spacer.
  2. A substrate according to claim 1, wherein the ratio (A1/A2) of the area of the back image (A1) of a black and white image obtained by transmitting LED light of a wavelength of 550 nm onto the substrate to the area of the back image (A2) of the black and white image of the LED light is 3 or less.
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  4. In claim 1, the non-linear line spacer is a substrate comprising two or more curved portions having different curvatures within the range of 20R to 90R.
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  6. A substrate comprising a substrate layer; and a spacer pattern formed on the substrate layer, The standard deviation of the lengths of the width, height, and left and right diagonals of the white image of a black and white image obtained by transmitting LED light of a wavelength of 550 nm through the above substrate is 80 or less, and The above spacer pattern includes a plurality of line-shaped spacers that intersect each other to form a net shape and form a plurality of closed shapes, At at least some of the intersection points of the plurality of linear spacers forming the above-mentioned closed shape, the linear spacers form a curved shape with a curvature within the range of 30R to 70R, and The line-shaped spacer connecting adjacent intersection points of some of the intersection points forming the above-mentioned closed shape includes a curved shape with a curvature within the range of 30R to 70R, and The average area of the plurality of closed shapes is within the range of 0.1 mm² to 2 mm² , and The standard deviation of the area of the plurality of closed shapes is greater than 0 mm² and less than or equal to 10 mm² , and A substrate satisfying the following Equation 6: [Equation 6] A ≠ 180×(n-2)/n In Equation 6, A is the interior angle of the closed figure formed by three adjacent intersections among the intersections that form a single closed figure in the net shape, and n is the number of intersections that form the single closed figure.
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  9. A substrate comprising a substrate layer; and a spacer pattern formed on the substrate layer, The standard deviation of the lengths of the width, height, and left and right diagonals of the white image of a black and white image obtained by transmitting LED light of a wavelength of 550 nm through the above substrate is 80 or less, and The above spacer pattern includes a plurality of line-shaped spacers that intersect each other to form a net shape and form a plurality of closed shapes, The above closed figure satisfies the following Equation 6, and the sides of the above closed figure are in the form of straight lines, and The average area of the plurality of closed shapes is within the range of 0.1 mm² to 2 mm² , and A substrate in which the standard deviation of the area of the plurality of closed shapes is 0.05 mm² to 0.6 mm² or less: [Equation 6] A ≠ 180×(n-2)/n In Equation 6, A is the interior angle of the closed figure formed by three adjacent intersections among the intersections that form a single closed figure in the net shape, and n is the number of intersections that form the single closed figure.
  10. In claim 6, a substrate in which the number of intersection points forming a single closed shape existing in a net form is within the range of 4 to 8.
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  12. In claim 6, a substrate in which the spacing between adjacent intersections is within the range of 100 μm to 1000 μm.
  13. An optical device comprising a substrate according to claim 1, 6, or 9, and a second substrate disposed opposite to the substrate, wherein a gap between the substrate and the second substrate is maintained by a spacer of the substrate.
  14. An optical device according to claim 13, wherein a liquid crystal material exists in the gap between substrates.

Description

Substrate This application relates to a substrate. An optical device is known that can control light transmittance, color, or reflectance by placing a light modulating material, such as a liquid crystal compound or a mixture of a liquid crystal compound and a dye, between opposing substrates. In such a device, so-called spacers are positioned between the substrates to maintain the gap between them. So-called ball spacers and bulkhead spacers are typically used as spacers. The shape and arrangement of the spacers affect the performance of the optical device. For example, spacers with a regular shape and arrangement cause optical defects, such as unnecessary and undesirable diffraction phenomena in some optical devices, which degrade the visibility or optical performance of the optical device. One can consider a method to resolve the aforementioned optical defects by irregularly arranging column spacers, etc. However, in such cases, it is difficult to maintain a uniform spacing between substrates in the optical device, and non-uniform spacing between substrates can also cause optical defects. In addition, a column spacer of the above type is disadvantageous in terms of the durability and mechanical properties of the optical device, and is also disadvantageous when, for example, configuring the optical device in a curved shape or configuring a flexible device. Furthermore, a column spacer of the above type is not advantageous in terms of securing adhesion between substrates. FIG. 1 is a schematic diagram illustrating a diffraction test performed on a substrate of the present application. Figure 2 is a diagram showing a method for measuring the size of the diffraction pattern of a back image. FIG. 3 is a drawing of an exemplary spacer pattern of the present application. Figure 4 is a diagram showing the process of forming the spacer pattern of Figure 3. FIGS. 5 and 6 are drawings of exemplary spacer patterns of the present application. Figure 7 is a drawing of the spacer pattern of the comparative example. Figures 8 and 9 are images showing the results of diffraction tests performed on the examples and comparative examples. FIGS. 10 to 12 are drawings of exemplary spacer patterns of the present application. Figure 13 is a drawing of a spacer pattern of a comparative example. Figures 14 to 16 are images showing the results of diffraction tests performed on the examples and comparative examples. FIG. 17 is a drawing of an exemplary spacer pattern of the present application. Figure 18 is a drawing of a spacer pattern of a comparative example. FIG. 19 is a drawing of an exemplary spacer pattern of the present application. FIG. 20 is a drawing for explaining the process of calculating the area of a closed shape of an exemplary spacer pattern of the present application. FIG. 21 is a drawing of an exemplary spacer pattern of the present application. FIG. 22 is a diagram illustrating the process of calculating the area of a closed shape of an exemplary spacer pattern of the present application. FIGS. 23 to 26 are images showing the results of diffraction tests performed on the examples and comparative examples. FIG. 27 is a drawing of an exemplary spacer pattern of the present application. FIG. 28 is a diagram illustrating the process of forming the spacer pattern of FIG. 27. FIG. 29 is a diagram illustrating the process of calculating the area of a closed shape of an exemplary spacer pattern of the present application. Figures 30 and 31 are images showing the results of diffraction tests performed on the examples and comparative examples. FIG. 32 is a drawing for explaining the process of forming a spacer pattern of the present application. The present application will be specifically described through the following examples, but the scope of the present application is not limited by the following examples. 1. Analysis of the substrate's diffraction pattern The diffraction pattern was analyzed for the substrate (structure of substrate layer/ITO electrode layer/spacer pattern) prepared in the example or comparative example. When analyzing the diffraction pattern, the substrate was applied with a width and length of 100 mm each. The process of conducting the above analysis is schematically illustrated in Figure 1. As shown in FIG. 1, a circular LED light source with a diameter of about 3 mm and a camera (cannon lens) capable of receiving light from the light source were placed at a distance of about 60 cm. Then, the substrate was placed between the light source and the camera. As shown in FIG. 1, the substrate was placed at a distance of 30 cm from each of the light source and the camera. A light source was positioned to irradiate light onto the center (center of gravity) of the substrate, and a camera was positioned so that light irradiated from the light source could be directly incident upon it in the absence of the substrate. Additionally, the substrate was positioned so that the surface on which the spacer is forme