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.
You may search our site by your laptop MODEL NUMBER. The model number can usually be found on the bottom of your laptop, LCD monitor or touch pad. If you have an IBM T42, enter T42 as your search term. If no results have come up for your full Model Number IE: DV4-2145dx, try inputting the short version  DV4 . You may also try browsing for your key using the menu to the left.