Active-matrix display device, and active-matrix organic electroluminescent display device

摘要

An active-matrix display device employs current-programmed-type pixel circuits and performs the writing data to each of pixels on a line-by-line basis. The active-matrix display device having a matrix of current-programmed-type pixel circuits includes a data line driving circuit 15 formed of m current driving circuits (CD) 15-1 to 15-m arranged-corresponding to respective data lines 13-1 to 13-m. The data line driving circuit (CD) 15-1 to 15-m holds image data (luminance data herein) in the form of voltage, and then converts the voltage of the image data into a current signal. The current signal is then fed to the data lines 13-1 to 13-m at a time. The image information is thus written on the pixel circuits 11.

主权项

1. A display device comprising:
a pixel element configured to emit light; a current line coupled to the pixel element; and a driving circuit including a holding unit, a first transistor, a second transistor, a third transistor, a fourth transistor and a fifth transistor, wherein the holding unit is configured to hold a luminance data voltage corresponding to an image information signal, the third transistor and the fourth transistor are connected to the first transistor, and the fifth transistor is connected to the holding unit, and wherein the driving circuit is configured to operate such that: a reset signal and the image information signal are sequentially written to the holding unit, via the fifth transistor and the second transistor, respectively, during a predetermined period; the fourth transistor electrically connects a current node of the first transistor to a gate node of the first transistor; the third transistor switches current flow on and off from the first transistor to the current line, and is set in an off state in at least a portion of the predetermined period; and the first transistor transforms the luminance data voltage in the holding unit into a current signal, the current signal being supplied to the pixel element through the current line.