Portability is another key selling point of portable projectors, and volume/size is an important purchasing consideration for consumers. But with single-panel LCD projectors, any decrease in size results in the problem of bottlenecking. This problem arises from the use by cheap portable projectors of smartphone LCDs as the main imaging component, because the LCD cannot achieve higher resolutions such as 720P if it is too small. With most smartphone LCD panels sized 5 to 6 inches, compared to 0.3-inch DMDs for DLP pico projectors, the difference in size can be up to ten or twenty fold. Additionally, for the light source to effectively cover the entire image when it shines on the LCD panel, all internal projector mechanics, including the lens and mirror, have to adjust according to panel size. As a result, single-panel LCD portable projectors are unable to achieve the portability of DLP portable projectors.