US 12,340,749 B2
Display device including a plurality of pixel circuits and luminance driving method therefor
Seiichi Uchida, Kameyama (JP)
Assigned to SHARP DISPLAY TECHNOLOGY CORPORATION, Kameyama (JP)
Appl. No. 18/692,939
Filed by Sharp Display Technology Corporation, Kameyama (JP)
PCT Filed Nov. 5, 2021, PCT No. PCT/JP2021/040727
§ 371(c)(1), (2) Date Mar. 18, 2024,
PCT Pub. No. WO2023/079674, PCT Pub. Date May 11, 2023.
Prior Publication US 2024/0395204 A1, Nov. 28, 2024
Int. Cl. G09G 3/30 (2006.01); G09G 3/3233 (2016.01); G09G 3/3266 (2016.01); G09G 3/3275 (2016.01)
CPC G09G 3/3233 (2013.01) [G09G 3/3266 (2013.01); G09G 3/3275 (2013.01); G09G 2310/08 (2013.01); G09G 2330/023 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A display device including a plurality of pixel circuits, each of the pixel circuits including a display element configured to emit light with luminance depending on an amount of a drive current to be supplied, the display device comprising:
a first power supply line to which a first power supply potential is applied;
a second power supply line to which a second power supply potential is applied;
an initialization power supply line to which an initialization potential is applied;
an adjustment circuit configured to adjust an amount of the drive current; and
an adjustment capacitor,
wherein each of the plurality of pixel circuits includes:
the display element provided between the first power supply line and the second power supply line, and including a first terminal on a side of the first power supply line and a second terminal on a side of the second power supply line;
a drive transistor including a control terminal, a first conduction terminal, and a second conduction terminal, and provided in series with the display element to supply the drive current to the display element during a predetermined light emission period; and
a drive current control node connected to the control terminal of the drive transistor and one end of the adjustment capacitor, and configured to be charged based on a data signal during a predetermined charging period,
the adjustment circuit includes:
a light emission intensity adjustment node connected to another end of the adjustment capacitor;
a light receiving circuit including a light receiving element and connected to the light emission intensity adjustment node, the light receiving circuit being configured to generate a photocurrent depending on intensity of light incident on the light receiving element during the charging period; and
a light emission intensity adjustment node initialization circuit configured to initialize the light emission intensity adjustment node based on the initialization potential during a period between the charging period and the light emission period,
the light receiving circuit includes a photocurrent control transistor including a control terminal, a first conduction terminal, and a second conduction terminal and provided in series with the light receiving element between the first power supply line and the light emission intensity adjustment node, and
the photocurrent control transistor is maintained in an off state during a period other than the charging period, and is turned on during the charging period.