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Improvement of Spatial Luminance Uniformity in Emitted Light from Flexible Backlight Using Notch-Type Variable Light Distribution Films
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Summary :
In recent years, flexible liquid crystal displays (LCDs) have attracted much attention due to their thin and lightweight designs, as well as their ease of installation compared with conventional flat-panel LCDs. Most LCDs require backlight units (BLUs) to yield high-quality images. However, the luminance uniformity of flexible BLUs is drastically reduced in the curved state, as the light emitted from a typical BLU is mainly directed in the normal direction. Conventional BLUs do not provide the image quality of flexible BLUs due to uneven luminance distribution from the perspective of the observer. To overcome these issues, here we introduce a novel oblique-angled notched film for improved light distribution of a conventional BLU. The notched structure of the proposed film exhibits V-shaped split behavior during curvature. This elastic deformation is expected to compensate for the spatial luminance of the light emitted from the BLU. We investigated the design requirements for the proposed film based on geometrical calculations. The luminance distribution of a flexible BLU was then simulated using the proposed film, based on geometrical optics theory. The simulation results confirmed that the direction of travel of the light is controllable according to the total internal reflection of the proposed film, thus improving the luminance uniformity of the BLU in a convex-curved state. Based on these results, the proposed approach is expected to improve the luminance uniformity of convex-curved flexible LCDs.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E102-C No.11 pp.789-794
- Publication Date
- 2019/11/01
- Publicized
- Online ISSN
- 1745-1353
- DOI
- 10.1587/transele.2019DII0004
- Type of Manuscript
- Special Section INVITED PAPER (Special Section on Electronic Displays)
- Category
Authors
Takumi SHOJI
Tohoku University
Yosei SHIBATA
Tohoku University
Takahiro ISHINABE
Tohoku University
Hideo FUJIKAKE
Tohoku University
Keyword
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Takumi SHOJI, Yosei SHIBATA, Takahiro ISHINABE, Hideo FUJIKAKE, "Improvement of Spatial Luminance Uniformity in Emitted Light from Flexible Backlight Using Notch-Type Variable Light Distribution Films" in IEICE TRANSACTIONS on Electronics,
vol. E102-C, no. 11, pp. 789-794, November 2019, doi: 10.1587/transele.2019DII0004.
Abstract: In recent years, flexible liquid crystal displays (LCDs) have attracted much attention due to their thin and lightweight designs, as well as their ease of installation compared with conventional flat-panel LCDs. Most LCDs require backlight units (BLUs) to yield high-quality images. However, the luminance uniformity of flexible BLUs is drastically reduced in the curved state, as the light emitted from a typical BLU is mainly directed in the normal direction. Conventional BLUs do not provide the image quality of flexible BLUs due to uneven luminance distribution from the perspective of the observer. To overcome these issues, here we introduce a novel oblique-angled notched film for improved light distribution of a conventional BLU. The notched structure of the proposed film exhibits V-shaped split behavior during curvature. This elastic deformation is expected to compensate for the spatial luminance of the light emitted from the BLU. We investigated the design requirements for the proposed film based on geometrical calculations. The luminance distribution of a flexible BLU was then simulated using the proposed film, based on geometrical optics theory. The simulation results confirmed that the direction of travel of the light is controllable according to the total internal reflection of the proposed film, thus improving the luminance uniformity of the BLU in a convex-curved state. Based on these results, the proposed approach is expected to improve the luminance uniformity of convex-curved flexible LCDs.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.2019DII0004/_p
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@ARTICLE{e102-c_11_789,
author={Takumi SHOJI, Yosei SHIBATA, Takahiro ISHINABE, Hideo FUJIKAKE, },
journal={IEICE TRANSACTIONS on Electronics},
title={Improvement of Spatial Luminance Uniformity in Emitted Light from Flexible Backlight Using Notch-Type Variable Light Distribution Films},
year={2019},
volume={E102-C},
number={11},
pages={789-794},
abstract={In recent years, flexible liquid crystal displays (LCDs) have attracted much attention due to their thin and lightweight designs, as well as their ease of installation compared with conventional flat-panel LCDs. Most LCDs require backlight units (BLUs) to yield high-quality images. However, the luminance uniformity of flexible BLUs is drastically reduced in the curved state, as the light emitted from a typical BLU is mainly directed in the normal direction. Conventional BLUs do not provide the image quality of flexible BLUs due to uneven luminance distribution from the perspective of the observer. To overcome these issues, here we introduce a novel oblique-angled notched film for improved light distribution of a conventional BLU. The notched structure of the proposed film exhibits V-shaped split behavior during curvature. This elastic deformation is expected to compensate for the spatial luminance of the light emitted from the BLU. We investigated the design requirements for the proposed film based on geometrical calculations. The luminance distribution of a flexible BLU was then simulated using the proposed film, based on geometrical optics theory. The simulation results confirmed that the direction of travel of the light is controllable according to the total internal reflection of the proposed film, thus improving the luminance uniformity of the BLU in a convex-curved state. Based on these results, the proposed approach is expected to improve the luminance uniformity of convex-curved flexible LCDs.},
keywords={},
doi={10.1587/transele.2019DII0004},
ISSN={1745-1353},
month={November},}
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TY - JOUR
TI - Improvement of Spatial Luminance Uniformity in Emitted Light from Flexible Backlight Using Notch-Type Variable Light Distribution Films
T2 - IEICE TRANSACTIONS on Electronics
SP - 789
EP - 794
AU - Takumi SHOJI
AU - Yosei SHIBATA
AU - Takahiro ISHINABE
AU - Hideo FUJIKAKE
PY - 2019
DO - 10.1587/transele.2019DII0004
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E102-C
IS - 11
JA - IEICE TRANSACTIONS on Electronics
Y1 - November 2019
AB - In recent years, flexible liquid crystal displays (LCDs) have attracted much attention due to their thin and lightweight designs, as well as their ease of installation compared with conventional flat-panel LCDs. Most LCDs require backlight units (BLUs) to yield high-quality images. However, the luminance uniformity of flexible BLUs is drastically reduced in the curved state, as the light emitted from a typical BLU is mainly directed in the normal direction. Conventional BLUs do not provide the image quality of flexible BLUs due to uneven luminance distribution from the perspective of the observer. To overcome these issues, here we introduce a novel oblique-angled notched film for improved light distribution of a conventional BLU. The notched structure of the proposed film exhibits V-shaped split behavior during curvature. This elastic deformation is expected to compensate for the spatial luminance of the light emitted from the BLU. We investigated the design requirements for the proposed film based on geometrical calculations. The luminance distribution of a flexible BLU was then simulated using the proposed film, based on geometrical optics theory. The simulation results confirmed that the direction of travel of the light is controllable according to the total internal reflection of the proposed film, thus improving the luminance uniformity of the BLU in a convex-curved state. Based on these results, the proposed approach is expected to improve the luminance uniformity of convex-curved flexible LCDs.
ER -
English
