
The portable computer monitors are flat screens. They are mostly active matrix (usually with Thin Film Transistor, or TFT, technology), which means that each pixel is controlled individually, thus enabling a smoother display than passive matrix displays, for which the pixels are controlled by row and column. The latest generations favor active matrices over the passive ones. The monitor size is characterized primarily by its height in inches, corresponding to the diagonal of the screen. Unlike monitors with cathode ray tubes (CRT), the diagonal of a flat screen is the display bleeding.

On the other hand, given the technology-based liquid crystals used in flat panel displays, the quality of a flat screen is defined by the response time, which is the time needed to bring a pixel from white to black, and then from black to white. The display format is generally 4:3 (4 units wide to 3 units high), but there are other formats for laptop screens such as 16:9 or 15:10, which are sometimes more suitable for viewing video (DVD for example). This type of screen usually has a diagonal size that does not measure as a whole number (for example 15.4 inches).
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