1602的屏一般为标准屏，接口定义基本一样，但由于厂家的差异，默认对比度不完全相同，

部分屏标有定义（视厂家而定） 。-1602' s screen is generally the standard screen, interface definition essentially the same, but because of differences in factory default contrast is not exactly the same part of the screen marked with the definition (as the manufacturer may be).