Cheap Laptops and faulty pixels
There are three major types of faulty pixels: hot pixels (always on, white), dead pixels (always off, black), and stuck or partially responsive pixels (one or more sub-pixels, i.e., red, blue, or green are always on or off) – for example, green and blue work, but red is stuck either on or off, therefore, the pixel displays an incorrect color. In a dead pixel, all three sub-pixels are permanently off, producing a permanently black pixel.
How faulty pixels appear? Firstly, even a new Cheap laptop with a new LCD screen can be sold with faulty pixels (manufacturing defect). Of course, it is not fair to sell a product that most people would not accept if they knew it had these defects. But such dishonest things still happen. Secondly, they can occur later because of a poor technology, for example, TFT (Thin Film Transistor that is linked to pixel) may degrade and eventually become blown. Thirdly, LCD screens are more fragile than old CRTs and faulty pixels can be easily contributed by computer users by putting a pressure upon screen.
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