H
Hoi Sing Kwok
Researcher at Hong Kong University of Science and Technology
Publications - 1207
Citations - 32982
Hoi Sing Kwok is an academic researcher from Hong Kong University of Science and Technology. The author has contributed to research in topics: Liquid crystal & Thin-film transistor. The author has an hindex of 77, co-authored 1165 publications receiving 29448 citations. Previous affiliations of Hoi Sing Kwok include University of Hong Kong & University of California, Berkeley.
Papers
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Journal ArticleDOI
OFF-State-Stress-Induced Instability in Switching Polycrystalline Silicon Thin-Film Transistors and Its Improvement by a Bridged-Grain Structure
TL;DR: In this article, an off-state stress is proposed to simulate the operation conditions of switching polycrystalline thin-film transistors in active-matrix displays for the first time.
Patent
Method to obtain a controlled pretilt and azimuthal angles in a liquid crystal cell
TL;DR: In this paper, a method of preparing liquid crystal alignment layers that can produce controllable pretilt angles from near 0 to near 90° is presented, which is based on stacking of two alignment materials sequentially, with the first one being continuous and the second one being discontinuous leaving part of the first layer exposed.
Journal ArticleDOI
Interference-free and single exposure to generate continuous cycloidal alignment for large-area liquid crystal devices.
Da Chen,Huijie Zhao,Kexin Yan,Dong Xu,Qi Guo,Linghao Sun,Fan Wu,Vladimir G. Chigrinov,Hoi Sing Kwok +8 more
TL;DR: This exposure method provides an effective and robust way for fabricating large-area LC elements, therefore paving the way for widespread applications of high-performance diffractive LC devices.
Journal ArticleDOI
29.3: Very Bright and Efficient Top-Emitting OLED with Ultra-Thin Yb as Effective Electron Injector
TL;DR: Very bright and efficient top emitting organic light-emitting diodes (TOLEDs) using an ultra-thin ytterbium (Yb) layer capped with a semitransparent Ag layer as the effective electron-injection cathode were demonstrated.
Patent
Transflective liquid crystal display
TL;DR: In this article, a photo alignment technique is used together with a shadow mask in an embodiment of the invention, and double exposure of the alignment layer with different orientations produces different alignment directions, thereby achieving the different LCD modes for the subpixels.