Abstract

To improve the color gamut of a liquid-crystal display (LCD), we propose a bandpass filter that is added to the backlight unit to optimize the backlight spectrum. The bandpass filter can only transmit red, green and blue light in the visible range, while reflecting the unwanted light. We study the optical properties of the bandpass filter using the transfer-matrix method, and the effect of the bandpass filter on the color gamuts of LCDs is also investigated. When a bandpass filter based on a 5-layer configuration comprising low and high refractive indices ((HL)2H) is used in phosphor-converted white-light-emitting diode (pc-WLED), K2SiF6:Mn4+ (KSF-LED), and quantum-dot (QD) backlights, the color gamuts of the LCDs improve from 72% to 95.3% of NTSC, from 92% to 106.7% of NTSC, and from 104.3% to 112.2% of NTSC respectively. When the incident angle of light increases to 30°, the color gamuts of LCDs with pc-WLED and KSF-LED backlights decrease by 2.9% and 1% respectively. For the QD backlight, the color gamut almost does not change. When the (HL)2H structure is coated on the diffusion film, the color gamut can be improved to 92.6% of NTSC (pc-WLED), 105.6% of NTSC (KSF-LED), and 111.9% of NTSC (QD). The diffusion film has no obvious effect on the color gamut. The results have an important potential application in wide-color-gamut LCDs.

PDF Article

References

  • View by:
  • |

  1. K. KakinumaTechnology of wide color gamut backlight with light-emitting diode for liquid crystal display televisionJpn. J. Appl. Phys.2006454330
  2. H. W. Chen, R. D. Zhu, J. He, , W. Duan, W. Hu, Y. Q. Lu, M. C. Li, S. L. Lee, Y. J. Dong, and S. T. WuGoing beyond the limit of an LCD’s color gamutLight Sci. Appl.20176e17043
  3. R. D. Zhu, Z. Y. Luo, H. W. Chen, Y. J. Dong, and S. T. WuRealizing Rec. 2020 color gamut with quantum dot displaysOpt. Express2015232368023693
  4. H. W. Chen, J. H. Lee, B. Y. Lin, S. Chen, and S. T. WuLiquid crystal display and organic light-emitting diode display: present status and future perspectivesLight. Sci. Appl.2018717168
  5. C. F . He, K. Y. Qian, and H. F. WangWide color gamut LCD module using white light LEDProc. SPIE201710244102440O
  6. C. C. Tsai, C. C. Lai, and S. M. HsiehWide color-gamut improvement of LCM using multi-phosphor white LED and modified rich color methodIEEE Trans. Consum. Electron.20095515661571
  7. Z. Luo, Y. Chen, and S. T. WuWide color gamut LCD with a quantum dot backlightOpt. Express2013212626926284
  8. Y. Y. Kang, Z. C. Song, X. F. Jiang, X. Yin, L. Fang, J. Gao, Y. H. Su, and F. ZhaoQuantum dots for wide color gamut displays from photoluminescence to electroluminescenceNanoscale Res. Lett.201712154
  9. K. Akahane, Y. Shibata, T. Ishinabe, and H. Fujikake67-3: Wide viewing angle Band-Pass reflective polarizer for Wide-Color-Gamut LCDsSID Int. Symp. Dig. Tech. Pap.201748988991
  10. H. Chen, R. Zhu, G. Tan, M.-C. Li, S.-L. Lee, and S.-T. WuEnlarging the color gamut of liquid crystal displays with a functional reflective polarizerOpt. Express201725102111
  11. D. H. Park, J. S. Han, W. Kim, and H. S. JangFacile synthesis of thermally stable CsPbBr3 perovskite quantum dot-inorganic SiO2 composites and their application to white light-emitting diodes with wide color gamutDyes Pigm.2018149246252
  12. H. C. Yoon, H. Kang, S. Lee, J. H. Oh, H. Yang, and Y. R. DoStudy of perovskite QD down-converted LEDs and six-color white LEDs for future displays with excellent color performanceACS Appl. Mater. Interfaces201681818918200
  13. L. YoungMultilayer interference filters with narrow stop bandsAppl. Opt.19676297315
  14. W. Withayachumnankul, B. M. Fischer, and D. AbbottQuarter-wavelength multilayer interference filter for terahertz wavesOpt. Commun.200828123742379
  15. B. Badoil, F. Lemarchand, M. Cathelinaud, and M. LequimeInterest of broadband optical monitoring for thin-film filter manufacturingAppl. Opt.20074642944303
  16. S. Ghoniemy and S. MahmoudPerformance optimization of thin film optical interference filters for optical communication systemsProc. IEEE International Conference on Signal Processing and CommunicationsDubai2007Nov.11111114
  17. C. Shou, Z. Luo, T. Wang, W. Shen, G. Rosengarten, W. Wei, C. Wang, M. Ni, and K. CenInvestigation of a broadband TiO2/SiO2 optical thin-film filter for hybrid solar power systemsAppl. Energy201292298306
  18. J. Fan, K. Hsiao, Y. J. Lee, R. C. Chien, C. Y. Lee, and S. J. Chen71-3: A new solution without quantum dots for LCD to achieve more than 90% BT.2020SID Int. Symp. Dig. Tech. Pap.201849949952
  19. H. A. MacleodThin Film Optical Filter4th ed.CRC PressRoca Raton2010
  20. R. J. Martin-Palma, J. M. Martinez-Duart, and A. MacleodDetermination of the optical constants of a semiconductor thin film employing the matrix methodIEEE Trans. Educ.2000436368
  21. S. H. Moo and C. K. HwangboEffects of annealing on the optical, structural, and chemical properties of TiO2 and MgF2 thin films prepared by plasma ion-assisted depositionAppl. Opt.20064514471455
  22. S. H. Moo and C. K. HwangboInfluence of plasma ion-beam assistance on TiO2 and MgF2 thin films deposited by plasma ion-assisted depositionSurf. Coat. Technol.200720182508257

Other (22)

K. KakinumaTechnology of wide color gamut backlight with light-emitting diode for liquid crystal display televisionJpn. J. Appl. Phys.2006454330

H. W. Chen, R. D. Zhu, J. He, , W. Duan, W. Hu, Y. Q. Lu, M. C. Li, S. L. Lee, Y. J. Dong, and S. T. WuGoing beyond the limit of an LCD’s color gamutLight Sci. Appl.20176e17043

R. D. Zhu, Z. Y. Luo, H. W. Chen, Y. J. Dong, and S. T. WuRealizing Rec. 2020 color gamut with quantum dot displaysOpt. Express2015232368023693

H. W. Chen, J. H. Lee, B. Y. Lin, S. Chen, and S. T. WuLiquid crystal display and organic light-emitting diode display: present status and future perspectivesLight. Sci. Appl.2018717168

C. F . He, K. Y. Qian, and H. F. WangWide color gamut LCD module using white light LEDProc. SPIE201710244102440O

C. C. Tsai, C. C. Lai, and S. M. HsiehWide color-gamut improvement of LCM using multi-phosphor white LED and modified rich color methodIEEE Trans. Consum. Electron.20095515661571

Z. Luo, Y. Chen, and S. T. WuWide color gamut LCD with a quantum dot backlightOpt. Express2013212626926284

Y. Y. Kang, Z. C. Song, X. F. Jiang, X. Yin, L. Fang, J. Gao, Y. H. Su, and F. ZhaoQuantum dots for wide color gamut displays from photoluminescence to electroluminescenceNanoscale Res. Lett.201712154

K. Akahane, Y. Shibata, T. Ishinabe, and H. Fujikake67-3: Wide viewing angle Band-Pass reflective polarizer for Wide-Color-Gamut LCDsSID Int. Symp. Dig. Tech. Pap.201748988991

H. Chen, R. Zhu, G. Tan, M.-C. Li, S.-L. Lee, and S.-T. WuEnlarging the color gamut of liquid crystal displays with a functional reflective polarizerOpt. Express201725102111

D. H. Park, J. S. Han, W. Kim, and H. S. JangFacile synthesis of thermally stable CsPbBr3 perovskite quantum dot-inorganic SiO2 composites and their application to white light-emitting diodes with wide color gamutDyes Pigm.2018149246252

H. C. Yoon, H. Kang, S. Lee, J. H. Oh, H. Yang, and Y. R. DoStudy of perovskite QD down-converted LEDs and six-color white LEDs for future displays with excellent color performanceACS Appl. Mater. Interfaces201681818918200

L. YoungMultilayer interference filters with narrow stop bandsAppl. Opt.19676297315

W. Withayachumnankul, B. M. Fischer, and D. AbbottQuarter-wavelength multilayer interference filter for terahertz wavesOpt. Commun.200828123742379

B. Badoil, F. Lemarchand, M. Cathelinaud, and M. LequimeInterest of broadband optical monitoring for thin-film filter manufacturingAppl. Opt.20074642944303

S. Ghoniemy and S. MahmoudPerformance optimization of thin film optical interference filters for optical communication systemsProc. IEEE International Conference on Signal Processing and CommunicationsDubai2007Nov.11111114

C. Shou, Z. Luo, T. Wang, W. Shen, G. Rosengarten, W. Wei, C. Wang, M. Ni, and K. CenInvestigation of a broadband TiO2/SiO2 optical thin-film filter for hybrid solar power systemsAppl. Energy201292298306

J. Fan, K. Hsiao, Y. J. Lee, R. C. Chien, C. Y. Lee, and S. J. Chen71-3: A new solution without quantum dots for LCD to achieve more than 90% BT.2020SID Int. Symp. Dig. Tech. Pap.201849949952

H. A. MacleodThin Film Optical Filter4th ed.CRC PressRoca Raton2010

R. J. Martin-Palma, J. M. Martinez-Duart, and A. MacleodDetermination of the optical constants of a semiconductor thin film employing the matrix methodIEEE Trans. Educ.2000436368

S. H. Moo and C. K. HwangboEffects of annealing on the optical, structural, and chemical properties of TiO2 and MgF2 thin films prepared by plasma ion-assisted depositionAppl. Opt.20064514471455

S. H. Moo and C. K. HwangboInfluence of plasma ion-beam assistance on TiO2 and MgF2 thin films deposited by plasma ion-assisted depositionSurf. Coat. Technol.200720182508257

Cited By

OSA participates in Crossref's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.