PH4 led display is used indoor with the small pixel pitch. the led lamps are SMD3528 with the features of high brightness,short viewing distance,big size,high defination,small pixel pitch make the indoor SMD display be an ideal advertising in all indoor advertising field.The viewing distance can be as short as 1 meters, as far as 200 meters, has a overwhelming advantage to LCD panels.with the current technology, we can supply the customer with this specification, but the price is much expensive.With the continuous LED chip brightiness improving and cost lowering,the indoor SMD PH4mm LED will definetly be more and more popularized in the coming years.PH12 can be both 3rgb led display without virtual effect and 4rgb with the virtual effect. the module of the PH4 is32*32 and the pixel density is62500. the module size is 128*128, the cabinet size is 1280*1280