Mr. Koichiro Yoshida Profile

Koichiro Yoshida

Senior Researcher at HOYA Corp

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Proceedings Article | 12 June 2018 Paper

New half-tone lithography uses for FPD proximity printing

Shuhei Kobayashi, Koichiro Yoshida, Masayuki Miyoshi, Yutaka Yoshikawa

Proceedings Volume 10807, 1080706 (2018) https://doi.org/10.1117/12.2324654

KEYWORDS: SRAF, Photomasks, Lithography, Resolution enhancement technologies, LCDs, Halftones, Optical proximity correction, Flat panel displays

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Liquid Crystal Displays (LCDs), which are the current prevalent displays, can be roughly separated into two modules. Of these, the Color Filter (CF) module is frequently manufactured using a proximity exposure system also known as proximity printing, which offers relatively lower resolution and higher throughput. This is because the CF only functions as an optical filter and so only requires rough patterning with the width of large sub-pixel units. However, due to the recent rapid shrinkage of pixel units, the productivity of CF is worsening. This is particularly evident in Black Matrix (BM), which requires finer patterns than for other CF layers and therefore is becoming a bottleneck preventing the progress of displays, especially for manufacturers who have only proximity printing equipment. We demonstrated that it is possible to achieve practical optical image miniaturization in FPD lithography via the appropriate use of Half-Tone (HT) exposure which suppresses the light intensity, as per the Fresnel diffraction theory which governs proximity printing. Two desirable results were subsequently obtained in tests using actual BM processes: stable formation with fine BM lines of less than 6μm width, and an improvement in the corner shape using sub-resolution HT features.

Proceedings Article | 28 September 2017 Paper

Technical trends of large-size photomasks for flat panel displays

Koichiro Yoshida

Proceedings Volume 10446, 104460D (2017) https://doi.org/10.1117/12.2279601

KEYWORDS: LCDs, Photomasks, Organic light emitting diodes, Flat panel displays, Optical lithography, Information technology

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Currently, flat panel displays (FPDs) are one of the main parts for information technology devices and sets. From 1990's to 2000's, liquid crystal displays (LCDs) and plasma displays had been mainstream FPDs. In the middle of 2000's, demand of plasma displays declined and organic light emitting diodes (OLEDs) newly came into FPD market. And today, major technology of FPDs are LCDs and OLEDs. Especially for mobile devices, the penetration of OLEDs is remarkable. In FPDs panel production, photolithography is the key technology as same as LSI. Photomasks for FPDs are used not only as original master of circuit pattern, but also as a tool to form other functional structures of FPDs. Photomasks for FPDs are called as "Large Size Photomasks(LSPMs)", since the remarkable feature is " Size" which reaches over 1- meter square and over 100kg. In this report, we discuss three LSPMs technical topics with FPDs technical transition and trend. The first topics is upsizing of LSPMs, the second is the challenge for higher resolution patterning, and the last is “Multi-Tone Mask” for "Half -Tone Exposure".

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