Laptop displays
TFT, LCD, VGA
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LCD (liquid crystal display) screens come in various sizes and resolutions. Resolution is defined as the number of pixels or small dots that make up an LCD screen. The pixel is the smallest unit that makes up an image. Most screens sold today are TFT active matrix LCD screens. TFT active matrix is a technology in which each pixel has a transistor attached to it to control the back light shining through. The screen are perfectly flat, about half an inch thick, and don't use much power. For passive matrix screens, HPA screens are harder to view at angles, but newer versions have improved greatly from the vague and translucent image quality of old DSTN screens. Still, TFT screens are brighter and sharper than even the best passive matrix screens. Each pixel on the screen is made up of 3 sub-pixels (red, green and blue). Each of these pixels turns on and off and filters light through colored sub-pixels which results in an image. Occasionally, these individual transistors will short or remain open resulting in a dead pixel. Considering the number of pixels contained in an LCD panel, the defective rate should dead pixels be present is usually quite minute. For a typical laptop screen, a 14.1" screen with XGA resolution (1024 x 768 pixels), has a total of 2,359,296 red, green and blue pixels (1024 x 768 x 3). Each of these pixels turns on and off and filters light through colored sub-pixels which results in an image. The more pixels or higher the resolution a screen is the crisper the image. In addition, higher resolution screens allow more of an image to be viewable. Here's a range of laptop screen sizes and the resolutions that are often displayed on the screen:
As can be seen in the table above, LCD screens are considered either standard-aspect or wide-aspect. Wide-aspect ratio screens which have become quite popular recently are LCD screens with a resolution aspect ratio greater than 1.33x (number of horizontal pixels / number of vertical pixels). Less expensive screens typically have the 1024x768 resolution. This resolution is fine as text is more comfortable to read. For a larger desktop space, the recommended resolution is a 1400x1050 or 1600x1200 screen. Standard 1280x1024 screens are not as common lately as they once were. Any laptop models come with more than one type of LCD screen. This is most obvious for those laptop models that come with LCD screens of different sizes or resolutions. For example, the Dell Inspiron 5100 may have a 14.1" XGA (1024 x 768 pixels) display, a 15.0" XGA (1024 x 768 pixels) display or a 15.0" SXGA+ (1400 x 1050 pixels) display. Moreover, prices of LCD screens commonly vary by size and resolution in addition to other characteristics. A laptop with a 14" or 15" diagonal screen is going to be physically larger than one with a 12" or 13" screen. The actual size of the laptop has been increased in order to hold the larger screen. So, choose wisely if you want a big screen. As time goes on, larger screens will keep getting cheaper, and instead of increasing screen size, laptop prices will go down. I can't imagine a laptop with a 17" LCD screen, but it is possible if there is demand for it. If you are aiming for a very small notebook, you will most probably end up with a 12" screen. More about notebooks' displays and sound |
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