A light-emitting device using an LED as a light source, the light-emitting device comprising:
- a plurality of LED units each including one or a plurality of the LEDs, the plurality of LED units being provided, on a substrate logically divided into a plurality of areas, corresponding to the plurality of areas in a one-to-one manner;
- a plurality of area drive circuits each configured to drive the LED included in a corresponding one of the LED units, the plurality of area drive circuits being provided corresponding to the plurality of LED units in a one-to-one manner;
- a plurality of first write control lines;
- a plurality of data lines intersecting with the plurality of first write control lines;
- a plurality of second write control lines corresponding to the plurality of first write control lines in a one-to-one manner;
- a first power supply line configured to supply a first power supply voltage;
- a second power supply line configured to supply a second power supply voltage;
- and
- a drive control circuit connected to the plurality of first write control lines, the plurality of second write control lines, and the plurality of data lines, and configured to control an operation of the plurality of area drive circuits such that the LEDs included in the plurality of LED units are driven on a row-by-row basis,
- wherein the area drive circuits each include
- a drive transistor connected in series to the LED included in the corresponding one of the LED units, between the first power supply line and the second power supply line,
- a first write control transistor including a control terminal connected to a corresponding one of the first write control lines and including a first conduction terminal connected to a corresponding one of the data lines,
- a first holding capacitor including one end connected to a second conduction terminal of the first write control transistor and including another end connected to the second power supply line,
- a second write control transistor including a control terminal connected to a corresponding one of the second write control lines and including a first conduction terminal connected to the one end of the first holding capacitor, and
- a second holding capacitor including one end connected to a second conduction terminal of the second write control transistor and to a control terminal of the drive transistor and including another end connected to the second power supply line,
- the drive transistor is a MOSFET,
- each of the area drive circuits has a first write period in which the first write control transistor and the second write control transistor are both maintained in an on state, a first write stop period in which the first write control transistor and the second write control transistor are both maintained in an off state, and a second write period in which the first write control transistor is maintained in the off state and the second write control transistor is maintained in the on state, the periods being provided in this order in one frame period from a point when the first write control transistor changes from the off state to the on state to a point when the first write control transistor next changes from the off state to the on state.