Title:
DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP2019074750
Kind Code:
A
Abstract:
To provide a display device in which a light emitting element can emit light at a constant luminance even when the current characteristic is changed due to degradation or the like, which is fast in writing signals to pixels, which can display images in accurate gray scales, and which can be reduced in size with a low cost, and also to provide a driving method thereof.SOLUTION: Each pixel of the display device has a current supply circuit, a switch portion, and a light emitting element. The light emitting element, the current supply circuit, and the switch portion are connected in series between a power supply reference line and a power supply line. The switch portion is switched between ON and OFF using a digital video signal. The amount of constant current flowing in the current supply circuit is determined by a control signal input from the outside of the pixel. When the switch portion is ON, a constant current determined by the current supply circuit flows in the light emitting element and light is emitted.SELECTED DRAWING: Figure 1
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Inventors:
KIMURA HAJIME
Application Number:
JP2018235669A
Publication Date:
May 16, 2019
Filing Date:
December 17, 2018
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB CO LTD
International Classes:
G09G3/3233; G09G3/20; G09G3/32; G09G5/00; G09G5/399; H01L27/32; H01L51/50; H05B44/00
Domestic Patent References:
| JPH0854835A | 1996-02-27 |
Foreign References:
| WO1998048403A1 | 1998-10-29 |