Manufacture of microscale random pattern using indentation machining technology
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Manufacture of microscale random pattern using indentation machining technology Je‑Ryung Lee1,2 · Seung Hwan Moon1 · Tae‑Jin Je1,3 · Doo‑Sun Choi1,3 · Hwi Kim2 · Eun‑chae Jeon4 Received: 16 January 2020 / Revised: 10 April 2020 / Accepted: 4 June 2020 © Korean Society for Precision Engineering 2020
Abstract The display industries recently demand new microscale dot-type patterns for thinner and brighter displays with high energy efficiency, which are randomly distributed with irregular separation distances and have uniform optical characteristics. We developed a new program to generate the coordinates of the controlled microscale random patterns considering their diameter and the distance to the nearest pattern for preventing overlap of each pattern. Then the microscale random patterns were machined on a metal mold using the indentation machining which is a simple and low-cost machining method. We decreased the total machining time by the optimization of machining order of the random patterns. The coordinates, the diameter and the fill-factor of the machined patterns by the indentation machining were much consistent to the designed values. The controlled microscale random patterns had uniform optical characteristics over all areas of the manufactured optical film. Moreover, if optical films have the same diameters and fill-factor, they showed the same optical characteristics even they have totally different coordinates of random microscale patterns. This technology is expected to reduce the number of the optical films and the light sources in the display, which can save much energies. Keywords Indentation machining · Microscale random pattern · Fill-factor · Optical characteristics
1 Introduction Recently in the display industry, films with specific micropatterns have been manufactured and inserted into products to diffuse the light source. Film patterning can reduce the number of light sources in the display without decreasing the uniformity of luminance over the entire area [1–5]. Conventional micropatterns consist of continuous and linear patterns, such as a prism pattern [6, 7] a lenticular pattern, [8] and others [9]. These patterns are used for diffusing * Hwi Kim [email protected] * Eun‑chae Jeon [email protected] 1
Department of Nano Manufacturing, Korea Institute of Machinery and Materials, 34103 Daejeon, South Korea
2
Department of Electronics and Information Engineering, Korea University, 30019 Sejong, South Korea
3
Department of Nanomechatronics, University of Science and Technology, 34113 Daejeon, South Korea
4
School of Materials Science and Engineering, University of Ulsan, 44610 Ulsan, South Korea
or concentrating lights. As the displays are thinner, the diffusing of lights becomes more important because the lights should be distributed evenly on all surfaces of the display. In order to distribute the light evenly, the sufficient distance between the light sources and the surface of the display is needed to spread the l
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