1.2 CQ Flashcards
Which kind of video technology do most laptop LCDs use?
Image A. TFT active matrix
Image B. Passive matrix
Image C. OLED
Image D. MAC ID
. TFT active-matrix displays are the most common in laptops that use LCDs. Passive-matrix screens have been discontinued, but you might see an older laptop that utilizes this technology. OLED technology is a newer and different technology that is not based on TFT displays, but instead uses emissive display technology, meaning that each dot on the screen is illuminated by a separate diode. OLED displays can, however, be passive-matrix or active-matrix controlled. The MAC ID is the hexadecimal address associated with a network adapter, such as a Wi-Fi adapter or network card.
Which of the following uses an organic compound that emits light?
Image A. TFT active matrix
Image B. IPS
Image C. OLED
Image D. LCD
Image E. LED
C. OLED (organic light emitting diode) displays use an organic compound or film that emits light. TFT active matrix implies LCD, and neither of them uses organic compounds the way OLED does. In-plane switching (IPS) is a type of LCD technology that increases the available viewing angle compared to older technologies such as twisted-nematic (TN) matrix LCDs. However, IPS is generally considered inferior to OLED screens when it comes to brightness and contrast ratio when viewed from an angle. LED screens use a film and diodes, but not organically in the way that OLED does, and not at such a small size.
Which of the following are two possible reasons why a laptop’s LCD suddenly went blank with no user intervention? (Select the two best answers.)
Image A. Damaged inverter
Image B. Damaged LCD
Image C. Burned-out backlight
Image D. Incorrect resolution setting
A and C. A damaged inverter or burned-out bulb could cause a laptop’s display to go blank. You can verify whether the LCD is still getting a signal by shining a flashlight at the screen. A damaged LCD usually works to a certain extent and will either be cracked, have areas of the Windows interface missing, or show other signs of damage. An incorrect resolution setting can indeed make the screen suddenly go blank (or look garbled), but that scenario will most likely occur only if the user has changed the resolution setting—the question specifies with no user intervention.
Which of the following allows us to access a WLAN?
Image A. LED
Image B. Webcam
Image C. Digitizer
Image D. Stylus
Image E. Wi-Fi card
E. A Wi-Fi card, also known as a Wi-Fi network adapter, allows us to connect to a WLAN (wireless local area network), which is essentially another name for a Wi-Fi network. LED is a type of display. A webcam is used to communicate visually and audibly with others, or to record oneself. A digitizer is the device that converts tapped or written impulses on a screen into digital information that the operating system can use. A stylus is a writing device used with a digitizer or touchscreen.
