Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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An Analysis of Patent Co-Classification Network for Exploring Core Technologies of Firms: An Application to the Foldable Display Sector

기업별 핵심기술 탐색을 위한 특허의 동시분류 네트워크 분석: 폴더블 디스플레이 분야에 대한 적용

  • Yun, Namshik (Department of Semiconductor-Display Science and Management, KOREATECH) ;
  • Ji, Ilyong (Department of Semiconductor-Display Science and Management, KOREATECH)
  • 윤남식 (한국기술교육대학교 반도체디스플레이과학경영학과) ;
  • 지일용 (한국기술교육대학교 반도체디스플레이과학경영학과)
  • Received : 2019.02.25
  • Accepted : 2019.04.05
  • Published : 2019.04.30
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Abstract

As there is severe competition in the global foldable display market, strategic technology planning is required. Patent analysis as a tool for technology planning has frequently been used due to data characteristics such as openness, formality, and detailed information. However, traditional patent analysis has various limitations such as quantitative approaches are limited in evaluating contents of patents and identifying core technologies of firms as they rely on number of patents, and qualitative approaches have time and cost problems as researchers have to investigate each patent on a case-by-case basis. In this research, we analyze core technologies of firms in the foldable display sector analyzing patent co-classification Network. Results show that the number of patent applications has rapidly increased since 2014, and 92% of these patents are held by two panel manufacturers, SDC and LGD, and two device manufacturers, SEC and LGE. Network analysis shows that the two panel manufacturers' core technologies are similar and two device manufacturers are notably different. This research provides implications to the sector. Moreover, this study provides unique results drawn from co-classification network analysis, and therefore, our research suggests patent co-classification analysis as an effective tool for technology planning.

글로벌 폴더블 디스플레이 시장은 최근 업체들 간 치열한 경쟁이 벌어지고 있어, 정확한 기술 동향 분석을 통한 전략적 기술기획이 요구되고 있다. 기술기획을 위한 분석 방법으로서의 특허분석은 그 개방성, 정형성, 기술에 대한 상세정보 등의 데이터 특성으로 인해 현장에서 자주 활용되고 있다. 그런데 이 가운데 정성분석은 특허의 내용을 건별로 파악하여야 하는 관계로 시간과 비용의 문제가 발생하며, 전통적인 정량분석은 주로 특허의 수에 의존함으로써 특허의 내용 및 기업별 핵심기술을 파악하는 데 한계가 존재한다. 따라서 본 연구에서는 특허의 동시분류 네크워크 분석 방법을 활용하여 기업별 핵심기술을 분석해 보고자 하였다. 분석 결과, 폴더블 디스플레이 관련 특허 출원은 2014년부터 급격히 성장하여 출원 기업의 92%가 한국의 2개 패널 제조사(SDC 및 LGD)와 2개 세트 제조사(SEC 및 LGE)의 출원으로 확인되었다. 동시분류 네트워크를 분석해 본 결과, 패널 제조사인 SDC와 LGD는 핵심기술 분야가 서로 유사한 반면, 세트 제조사인 SEC와 LGE는 눈에 띄는 차별성이 존재함을 확인하였다. 이러한 결과는 본 분야 기업의 기술전략에 대한 시사점을 제공한다. 또한 특허 동시분류 네트워크를 통해서만 확인이 가능한 것으로, 이 분석이 기업 기술전략에 유용하게 활용될 수 있음을 확인하였다.

Keywords

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Fig. 1. Number of Patents by Year

SHGSCZ_2019_v20n4_382_f0002.png 이미지

Fig. 2. IPC Network (All Patents)

SHGSCZ_2019_v20n4_382_f0003.png 이미지

Fig. 3. IPC Network (SDC)

SHGSCZ_2019_v20n4_382_f0004.png 이미지

Fig. 4. IPC Network (LGD)

SHGSCZ_2019_v20n4_382_f0005.png 이미지

Fig. 5. IPC Network (SEC)

SHGSCZ_2019_v20n4_382_f0006.png 이미지

Fig. 6. IPC Network (LGE)

Table 1. Number of Patents by Applicants

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Table 2. Top 10 Degree Centrality (All Patents)

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Table 3. Top 10 Degree Centrality (SDC)

SHGSCZ_2019_v20n4_382_t0003.png 이미지

Table 4. Top 10 Degree Centrality (LGD)

SHGSCZ_2019_v20n4_382_t0004.png 이미지

Table 5. Degree Centrality (BOE)

SHGSCZ_2019_v20n4_382_t0005.png 이미지

Table 6. Top 10 Degree Centrality (SEC)

SHGSCZ_2019_v20n4_382_t0006.png 이미지

Table 7. Degree Centrality (LGE)

SHGSCZ_2019_v20n4_382_t0007.png 이미지

Table 8. Degree Centrality (Apple)

SHGSCZ_2019_v20n4_382_t0008.png 이미지

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