Display device and controlling method thereof

Patent metadata

Field	Value
Publication number	US-9147698-B2
Application number	US-201414321874-A
Country	US
Kind code	B2
Filing date	Jul 2, 2014
Priority date	Oct 31, 2002
Publication date	Sep 29, 2015
Grant date	Sep 29, 2015

Abstract

A conventional setting voltage was a value with an estimated margin of a characteristic change of a light emitting element. Therefore, a voltage between the source and drain of a driver transistor V ds had to be set high (V ds ≧V gs −V Th +a). This caused high heat generation and power consumption because a voltage applied to the light emitting element. The invention is characterized by feedbacking a change in a current value in accordance with the deterioration of a light emitting element and a power source voltage controller which modifies a setting voltage. Namely, according to the invention, the setting voltage is to be set in the vicinity of the boundary (critical part) between a saturation region and a linear region, and a voltage margin for the deterioration is not required particularly for an initial setting voltage.

First claim

What is claimed is:

1. A display device comprising:
a first region comprising a pixel, the pixel comprising a first semiconductor film;
a second region comprising a second semiconductor film;
a first line overlapping the first semiconductor film and the second semiconductor film;
a second line overlapping the first line; and
a third line overlapping the first line,
wherein the first semiconductor film and the second semiconductor film have substantially a same shape,
w…

Assignees

• Semiconductor Energy Lab

Inventors

• Miyagawa Keisuke
• Koyama Jun

Classifications

• G09G2310/0251

  Physics · mapped topic

• G09G2300/0861

  Physics · mapped topic

• G09G2300/0426

  Physics · mapped topic

• G09G2300/0842

  Physics · mapped topic

• G09G3/3233 Primary

  Physics · mapped topic