Pixel circuit and display device

摘要

A pixel circuit includes: a light emitting element; an n-channel drive transistor T1 that has a source connected with an anode of the light emitting element, a gate connected with a pixel node, and controls a light emission current flowing in the light emitting element in accordance with a light emission control voltage between the gate and the source; a transfer transistor T2 which is interposed between a data signal line and the pixel node, and has a gate connected with a scan signal line; a control transistor T3 which is interposed between the source and a drain of the drive transistor T1, has a gate connected with the scan signal line, and comes into an ON state simultaneously with the transfer transistor T2; and a capacitance element which is interposed between the gate and the source of the drive transistor T1, and holds the light emission control voltage.

主权项

1. A display device in which a plurality of pixel circuits are arranged in a row direction and a column direction to constitute a pixel circuit array,
the pixel circuit comprising: a light emitting element which emits light by a light emission current flowing from an anode electrode to a cathode electrode; a first transistor element of an n-channel insulated gate thin-film transistor that has a source electrode connected with the anode electrode of the light emitting element, a gate electrode connected with a pixel node, and controls the light emission current in accordance with a light emission control voltage between the gate electrode and the source electrode; a first switch circuit which is interposed between a data signal line and the pixel node and is controlled for conduction/non-conduction in accordance with a voltage level of a first control terminal connected with a scan signal line; a second switch circuit which is interposed between the source electrode and a drain electrode of the first transistor element and is controlled for conduction/non-conduction in accordance with a voltage level of a second control terminal connected with the scan signal line, and comes into a conduction state at the time of conduction of the first switch circuit in accordance with a voltage level of the scan signal line, to selectivity short-circuit between the source electrode and the drain electrode of the first transistor; and a capacitance element which is interposed between the gate electrode and the source electrode of the first transistor element, and holds the light emission control voltage, wherein the pixel circuits arranged on an identical column each have one end of the first switch circuit connected to the data signal line extending in the column direction along the identical column, and the pixel circuits arranged on an identical row each have the first control terminal of the first switch circuit and the second control terminal of the second switch circuit connected to the scan signal line extending in the row direction along the identical row, and the drain electrode of the first transistor element connected to a light emission voltage supply line extending in the row direction along the identical row, the display device comprising: a data signal line drive circuit which individually drives the data signal line provided in plural; a scan signal line drive circuit which individually drives the scan signal line provided in plural; a light emission voltage supply line drive circuit which individually drives the light emission voltage supply line provided in plural; a monitor circuit which has a dummy pixel circuit configured by removing at least the light emitting element from the pixel circuit, and detects a current flowing between the drain electrode and the source electrode of the first transistor element provided in the dummy pixel circuit, to perform simulation monitoring of a change in electric characteristic of the first transistor element in the pixel circuit; and a correction circuit which corrects a voltage level of the data signal line driven by the data signal line drive circuit based on a current amount detected by the monitor circuit or a value equivalent to the current amount.