You cannot directly compare digital camera megapixels with display megapixels. The former uses Bayer-interpolation (except very few cameras with Foveon sensor)

You cannot directly compare digital camera megapixels with display megapixels. The former uses Bayer-interpolation (except very few cameras with Foveon sensor) while the latter has true RGB pixels. In the other words, the digital camera's pixel count of two million is shared between R, G, G, B pixels (500k of each – yes, most sensors have double green pixels). A Full HD monitor has 3 * 1920 * 1080 (sub)pixels. Because of Bayer interpolation, the true resolution of 3MP sensor roughly equals 2MP screen resolution. (Yes; I fully agree with your point that a phone doesn't need megazillion pixels. Sensor size is more important factor when speaking of image quality. [Not to mention the optics.])