The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 15, 2026
Filed:
Oct. 24, 2022
Semiconductor Energy Laboratory Co., Ltd., Atsugi, JP;
Semiconductor Energy Laboratory Co., Ltd., Atsugi, JP;
Abstract
A display device whose change in chromaticity is small and grayscale controllability is high is provided. Light emission of the light-emitting device can be performed by PAM and PWM control (a pulse width control involving changes in amplitude), so that the amount of change in chromaticity can be reduced and the controllability on the low grayscale side can be increased. The display device includes a pulse-signal-generation portion and a light-emitting control portion in a pixel and is capable of charging a signal potential in the light-emitting control portion and then discharging the signal potential in accordance with a pulse signal generated in the pulse-signal-generation portion. Thus, the light-emitting device can emit light in a desired period with desired emission intensity.