US 12,334,015 B2
Light emitting device, display device, photoelectric conversion device, electronic apparatus, illumination device, and moving body
Akihito Komazawa, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 6, 2024, as Appl. No. 18/597,103.
Claims priority of application No. 2023-041080 (JP), filed on Mar. 15, 2023.
Prior Publication US 2024/0312408 A1, Sep. 19, 2024
Int. Cl. G09G 3/3233 (2016.01); H10K 59/131 (2023.01)
CPC G09G 3/3233 (2013.01) [H10K 59/131 (2023.02); G09G 2300/0842 (2013.01); G09G 2320/0223 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/043 (2013.01); G09G 2330/02 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A light emitting device comprising:
a pixel that includes (1) a current path including a light emitting element and a driving transistor configured to supply a current corresponding to a luminance signal to the light emitting element,
(2) a capacitive element arranged between a gate and a source of the driving transistor,
(3) a first switching transistor arranged between the current path and a first power supply line configured to supply a current to the light emitting element,
(4) a second switching transistor arranged between the current path and a second power supply line configured to supply a current to the light emitting element, and
(5) a write transistor configured to write the luminance signal in the gate,
wherein a potential of the first power supply line is lower than a potential of the second power supply line,
wherein one frame period includes a write period in which the write transistor is rendered conductive to write the luminance signal in the gate, and a light emission period in which the light emitting element is caused to emit light after the write period,
wherein in the write period, the second switching transistor is rendered conductive while the write transistor is rendered conductive, and
wherein in the light emission period, the first switching transistor keeps in a conductive state.