Current drive circuit and image display device

Abstract

The present invention provide a display panel including a current-driven displaying elements arrayed therein, and a display device, which suppress the deterioration in the representation accuracy of grayscale levels of pixels, resulting from the variation in transistors formed within the display panel. A display panel according to the present invention is composed of a current-driven display element, a constant current control line, a constant current line, a current hold circuit, a switch circuit connected between said current-driven display element and said current hold circuit, a data line transmitting a data signal having a waveform corresponding to a grayscale level, and a control circuit provided with said data signal. Said current hold circuit outputs, when said constant current control line is deactivated, a drive current having an intensity substantially identical to that of a constant current provided thereto through said constant current line in the case that said constant current control line is activated. Said control circuit turns on and off said switch circuit in response to said data signal.