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Chinese Journal of Liquid Crystals and Displays, Volume. 37, Issue 4, 451(2022)

Application and development of polyimide in foldable AMOLED displays

He-jin WANG*, Xue-kai YANG, Song ZHANG, Zheng LIU, Li-bin LIU, Bao-ming CAI, Shi-ming SHI, and Da-wei WANG
Author Affiliations
  • BOE Technology Group Co.，Ltd.，Beijing 100176，China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (6)
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    References (16)
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    Figures & Tables(6)
    Flexible substrate.（a）Glass；（b）Metal；（c）Polymer.

    Fig. 1. Flexible substrate.（a）Glass；（b）Metal；（c）Polymer.

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    Structure and process of foldable AMOLED

    Fig. 2. Structure and process of foldable AMOLED

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    Polyimide prepared with BPDA and PDA

    Fig. 3. Polyimide prepared with BPDA and PDA

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    • Table 1. Performance of different substrate

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      Table 1. Performance of different substrate

      项目玻璃基板金属基板聚合物基板
      厚度-+++
      柔韧性-+++
      抗冲击性-+++
      成本+++++
      绝缘性++-++
      透明性++-++
      表面平坦性++-+/++
      耐高温++++-
      高温尺寸稳定性+++++
      水氧阻隔++++-

    • Table 2. Properties of U-Varnish S［15］

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      Table 2. Properties of U-Varnish S［15］

      薄膜特性规格溶液特性规格
      热分解温度/℃>550粘度/cP4 000~6 000
      玻璃化温度/℃>400固含量/%18.0±1
      热膨胀系数/（10-6/K）12密度/（g·cm-3）1.10~1.11
      拉伸强度/MPa392总金属离子含量/ppm-
      断裂伸长率/%30
      拉伸模量/GPa8.83
      介电常数3.5@1 kHz

    • Table 3. Performance comparison of CPI，UTG and PET［18-20］

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      Table 3. Performance comparison of CPI，UTG and PET［18-20］

      材料光学抗冲击抗蠕变弯折性成本优势
      CPI★★★★★★★★★★★★★★★
      UTG★★★★★★★★★★★★★★★★
      PET★★★★★★★★★★★★★★★★★
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    He-jin WANG, Xue-kai YANG, Song ZHANG, Zheng LIU, Li-bin LIU, Bao-ming CAI, Shi-ming SHI, Da-wei WANG. Application and development of polyimide in foldable AMOLED displays[J]. Chinese Journal of Liquid Crystals and Displays, 2022, 37(4): 451

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    Paper Information

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    Received: Dec. 29, 2021

    Accepted: --

    Published Online: Jun. 20, 2022

    The Author Email: He-jin WANG (wanghejin@boe.com.cn)

    DOI:10.37188/CJLCD.2021-0348

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