Improving the color gamut of LCD by a filter based on metal-dielectric-metal structure

Yan SUN; Chi ZHANG; Xiao-shuai LI; Yan-ling YANG; Hong-mei MA; Yu-bao SUN

doi:10.3788/YJYXS20203501.0019

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Improving the color gamut of LCD by a filter based on metal-dielectric-metal structure

Materials and Devices | 更新时间：2020-07-05

- Improving the color gamut of LCD by a filter based on metal-dielectric-metal structure
- Chinese Journal of Liquid Crystals and Displays Vol. 35, Issue 1, Pages: 19-25(2020)
- 作者机构：
  
  河北工业大学应用物理系, 天津 300401
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20203501.0019
  CLC： TN27
- Received：19 July 2019，
  
  Revised：29 September 2019，
  
  Accepted：29 September 2019，
  
  Published：05 February 2020
- 稿件说明：
移动端阅览
Yan SUN, Chi ZHANG, Xiao-shuai LI, et al. Improving the color gamut of LCD by a filter based on metal-dielectric-metal structure[J]. Chinese journal of liquid crystals and displays, 2020, 35(1): 19-25.
DOI：

Yan SUN, Chi ZHANG, Xiao-shuai LI, et al. Improving the color gamut of LCD by a filter based on metal-dielectric-metal structure[J]. Chinese journal of liquid crystals and displays, 2020, 35(1): 19-25. DOI： 10.3788/YJYXS20203501.0019.

摘要

为了拓宽LCD的色域，提出了在背光系统中添加基于TiO

-Ag-TiO

-Ag-Glass膜层结构的滤波器来优化背光源光谱。所提出的滤波器在可见光范围内可以仅通过红、绿和蓝3种颜色的光，而反射其他颜色的光。利用TechWiz 1D软件模拟了滤波器对于LCD色域的影响。当所提出的滤波器分别与黄色荧光粉（pc-WLED）、新红粉（KSF-LED）以及量子点（QD）背光源相结合时，LCD的色域分别从72%提升至102.6% NTSC，从92.3%提升至113.8% NTSC，从104.3%提升至119.9% NTSC。当入射光的角度从0°增加到40°时，3种背光源的色域变化都很小。模拟结果表明：基于金属-电介质-金属（MDM）膜层结构的滤波器拥有小的角度依赖性，因此对实现宽色域LCD，是一种非常有效的方法。但其光利用率很低，3种背光源的光效率分别为26.5%、35.4%以及40.7%。

Abstract

In order to improve color gamut of the LCD

a filter based on TiO

-Ag-TiO

-Ag-glass structure is added in the backlight unit to optimize the backlight spectra. The proposed filter can only transmit the red

green and blue light in visible light range

while reflecting other color light. The effect of a filter on the color gamut of LCD is simulated by TechWiz 1D software. When the proposed filter integrated with pc-WLED

KSF-LCD and QD backlight

the color gamut of LCD can be improved from 72% to 102.6% NTSC

from 92.3% to 113.8% NTSC

and from 104.3% to 119.9% NTSC

respectively. When the incident angle of light increases from 0° to 40°

the color gamut with three backlight changes a little. The simulation results show that the filter based on MDM structure has a smaller angle dependence

so it is a very effective method to realize wide color gamut LCDs. However

the light utilization rate is very low

and the light efficiency of the three backlights is 26.5%

35.4%

and 40.7%

respectively.

关键词

Keywords

references

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