analog signal vs digital signal

{"title":"2.88 'Inch TFT LCD HD Display 480*640 Industrial Digital LCD Display with Driving IC ST7701S","imgUrl":"https:\/\/img.chinax.com\/nimg\/af\/be\/40bdc9307ccb066bb3592d9170bf-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"RGH","Model Number":"RT28VG015A","Minimum Order Quantity":"3PICS","Delivery Time":"3-5weeks","Certification":"ISO9001\/ISO14001","Place of Origin":"Shenzhen,China","Payment Terms":"L\/C, T\/T,Paypal","Supply Ability":"3.5kk","Packaging Details":"Standard Exportation Package","Size":"2.8 inch","Resolution":"480 X\uff08RGB\uff09 X640","LCD Type":"Transmissive TFT","Viewing Direction":"ALL o\u2019clock","LCM Outline Dimension":"46.90 (H) X66.55(V) X2.35(T) mm","Active area":"43.20(H) X57.60 (V) mm","Brightness":"500 cd\/m2","Operation Temperature":"-20\u2103~70\u2103","Storage temperature":"-30\u2103~80\u2103","Number Of Pixel":"480 X\uff08RGB\uff09 X640","Driving IC":"ST7701S","Response time":"35ms","Contrast ratio":"1000:1","Interface":"SPI"}}