基于金属-电介质-金属结构的滤波器提升LCD色域的研究

为了拓宽LCD的色域,提出了在背光系统中添加基于TiO2-Ag-TiO2-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%。

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

In order to improve color gamut of the LCD,a filter based on TiO2-Ag-TiO2-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.