Patent ID: 8854343
Filing Date: 2014-10-07
Classification: G09G

Abstract:
1. A current-driven type display device that performs color display comprising: a plurality of pixel circuits arranged at respective intersections of a plurality of scanning lines and a plurality of data lines; and a gate and source drive circuits that select, from the plurality of pixel circuits, a selected pixel circuit using a corresponding scanning line, and write a corrected data voltage into the selected pixel circuit using a corresponding data line, wherein each pixel circuit is one of a plurality of different color pixel circuits including a red pixel circuit, a green pixel circuit and a blue pixel circuit, and includes an electro-optic element; a drive element having a control terminal, a first conduction terminal and a second conduction terminal to which a supply voltage is applied, and controlling an amount of current flowing through the electro-optic element according to a potential difference between the control terminal and the second conduction terminal; a first capacitor provided between the control terminal and the second conduction terminal of the drive element; a writing switching element provided between the control terminal of the drive element and the corresponding data line; and a compensation switching element provided between the control terminal and the first conduction terminal of the drive element, wherein the gate drive circuit is configured to set an initialization period within a selection period of the pixel circuit, set a threshold correction period within the selection period after the initialization period, and set a write period within the selection period after the threshold correction period; control the writing switching element to a conducting state during the selection period, and control the writing switching element to a non-conducting state outside the selection period; control the compensation switching element to the conducting state during the initialization period; control the compensation switching element to the conducting state during the threshold correction period; and control the compensation switching element to the non-conducting state during the writing period, wherein the source drive circuit includes a second capacitor corresponding to each of the plurality of data lines, and is configured to apply a first initial voltage to the control terminal of the drive element during the initialization period to set an initial potential difference between the control terminal and the second conduction terminal of the drive element to a difference between the supply voltage and the first initial voltage by applying the first initial voltage to the corresponding data line, the first initial voltage being selected from among a plurality of different initial voltages based on a color of the pixel circuit; make a correction current flow through the compensation switching element during the threshold correction period by applying no voltages to the corresponding data line, and store a voltage of the corresponding data line to the second capacitor at the end of the threshold correction period; and apply the corrected data voltage to the control terminal of the drive element during the writing period by applying a data voltage corrected using the voltage stored in the second capacitor, and wherein the plurality of the initial voltages are set such that the correction current flowing through the compensation switching element during the threshold correction period is smallest in the pixel circuit for green among the three types of pixel circuits.