RGB三基色的LCD显示器件在高端的应用领域已经不能满足细节显示要求。研究发现可以增加基色的数量, 如黄色, 形成RYGB四基色, 实验证明显示的色域有明显的改善。文中首先研究LCD的电光特性, 而后重点研究频谱带宽对LCD电光特性的影响。在1 kHz固定频率驱动下, 通过改变电压来改变LCD的透过率, 随着驱动电压的变化, LCD的透过率有较大变化。选取四种基色对应的波长, 研究它们的电光特性曲线, 得出LCD四基色的电光特性曲线随电压变化的趋势一致；研究不同带宽下四基色波长的透过率, 得出带宽对红、黄、绿三种基色的透过率影响不大, 而带宽对蓝基色的透过率影响较大。

Using the three primary colors RGB in liquid crystal display (LCD) is not sufficient to display the details required in high-end applications. By using more primary colors, such as adding yellow, the four primary colors RYGB is formed, the color gamut could be improved remarkably. Firstly, the electro-optical properties of LCD are researched. And then, the influence of spectral bandwidth on LCD electro-optical properties is studied deeply. Driven by 1 kHz fixed frequency, the transmittance of LCD changes with the changing of the voltage. With the changing of the driving voltage, the transmittance of LCD changes dramatically. Furthermore, by selecting the wavelengths corresponding to the four primary colors, the electro-optical property curves are researched, and the curves changing accords with the voltage changing trends. Through researching the transmittances of four primary colors wavelength under different bandwidth, it is found that the transmittances of three primary colors such as red, yellow and green is little influenced by the bandwidth, but the transmittance of blue primary color is greatly influenced.