The Iphone features a capacitive touchscreen that supports multi-touch sensing.
The iPhone is currently on its 5th generation. The first three generations – iPhone Original, iPhone 3G, and iPhone 3GS – have slightly lower resolution compared to the latest iPhone versions (iPhone 4 and iPhone 4S).
Although different generations might have slightly different overall dimensions, all the five versions of iPhone have 3.5 inches display – measured diagonally.
Here is a comparison of their screen properties:
|
IPhone 4S |
iPhone 4 |
iPhone 3GS |
iPhone 3G |
iPhone (Original) |
|
| Screen Size in inches | 3.5-inch diagonal | 3.5-inch diagonal | 3.5-inch diagonal | 3.5-inch diagonal | 3.5-inch diagonal |
| Screen Resolution | (640) × (960) pixels at 330 ppi | (640) × (960) pixels at 326 ppi | (320) × (480) pixels at 163 ppi | (320) × (480) pixels at 163 ppi | (320) × (480) pixels at 163 ppi |
| Colors | 16.7 million colors24-bit | 16.7 million colors24-bit | 16.7 million colors24-bit | 262,144 colors18-bit | 262,144 colors18-bit |
| iPhone Dimensions | (4.5) × (2.31) × (0.37) inches | (4.5) × (2.31) × (0.37) inches | (4.5) × (2.4) × (0.48) inches | (4.5) × (2.4) × (0.48) inches | (4.5) × (2.4) × (0.46) inches |
