US Patent 7915648 Light-receiving element and display device

A light-receiving element includes: a first-conductivity-type semiconductor region configured to be formed over an element formation surface; a second-conductivity-type semiconductor region configured to be formed over the element formation surface; an intermediate semiconductor region configured to be formed over the element formation surface between the first-conductivity-type semiconductor region and the second-conductivity-type semiconductor region, and have an impurity concentration lower than impurity concentrations of the first-conductivity-type semiconductor region and the second-conductivity-type semiconductor region. The light-receiving element further includes: a first electrode configured to be electrically connected to the first-conductivity-type semiconductor region; a second electrode configured to be electrically connected to the second-conductivity-type semiconductor region; and a control electrode configured to be formed in an opposed area that exists on the element formation surface.