This has become a common display type for mid-range to high-end phones. OLED/AMOLED. OLED & AMOLED utilizes 'organic' LEDs which emits light and in the majority of cases does away with the need for the back-light of an LCD display resulting in a potentially thinner panel.
1 The model number is located on a small label located on the frame around the computer screen. (e.g., VGN-FW550F)  The computer information and compliance label, located on the bottom of the laptop case, indicates the actual model number.
It begins with the letters MB and ends with 9 numbers and is located in the lower left of the bottom of the system. In the example below, the serial number is in the blue box and is MB056222765. Model number: The model number is located in two places on the bottom of the back, near the bar codes.