Patent ID: 8049739

Claim:
A liquid crystal display comprising: a light source for emitting light; a first substrate; a second substrate parallel to and facing the first substrate; and a plurality of pixel units formed between the first substrate and the second substrate, at least one of the pixel units comprising: a reflecting element, disposed on the first substrate, for reflecting light from the light source; a photo-sensing element, formed on the second substrate, for outputting a sensing parameter based on light reflected from the reflecting element, wherein each reflecting element is extended out of the first substrate and faces one of the plurality of photo-sensing elements, and wherein a touch point is determined based on a shortened distance between the reflecting element and the corresponding photo-sensing element in response to a loss of reflective light detected by the photo-sensing element when a force is applied on the reflecting element; and a black matrix layer formed on the first substrate without facing the plurality of photo-sensing elements, for blocking the light emitted from the light source, wherein the reflecting element is adjacent to the black matrix and is spaced apart from the black matrix to avoid ambient light entering the photo sensing elements, so that the reflecting element reflects backlight.