Patent ID: 8164719

Claim:
A liquid crystal display device comprising: a liquid crystal display panel including an active matrix substrate and a backlight for illuminating the liquid crystal display panel, wherein the active matrix substrate includes: a photodiode comprised of a silicon film; a base substrate supporting the photodiode; and a light shielding film for shielding the photodiode against illumination light from the backlight, the shielding film comprises a semiconductor, wherein the shielding film is located between at least the photodiode and the base substrate; wherein the photodiode is configured so that the silicon film thereof is comprised of polycrystalline silicon or continuous grain silicon so that a sensitivity of the photodiode increases as a wavelength of incident light entering the photodiode decreases; and wherein the light shielding film is comprised of an amorphous silicon film so that a transmittance of incident light entering the light shielding film decreases as a wavelength of the incident light decreases.