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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.:

US 9876062 B1

PDFFull Text
Date of Patent:
Jan. 23, 2018

Filed:

Jun. 03, 2016

Light emitting device, driving method of light emitting device and electronic device

Applicant:

Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;

Inventors:

Shunpei Yamazaki, Tokyo, JP;

Mai Akiba, Kanagawa, JP;

Jun Koyama, Kanagawa, JP;

Assignee:

Semiconductor Energy Laboratory Co., Ltd., Atsugi-shi, Kanagawa-ken, JP;

Attorney:

Fish & Richardson P.C.

Primary Examiner:

Thinh T Nguyen

Int. Cl.
CPC ...
H01L 29/04 (2006.01); H01L 27/32 (2006.01); G09G 3/20 (2006.01); G09G 3/3241 (2016.01); G09G 3/3283 (2016.01); H01L 27/15 (2006.01); H01L 27/12 (2006.01); G09G 3/3233 (2016.01); G09G 3/3258 (2016.01); H01L 51/52 (2006.01); G09G 3/3225 (2016.01); G09G 3/22 (2006.01); G09G 3/325 (2016.01); H01L 27/13 (2006.01); H01L 29/49 (2006.01); H01L 29/66 (2006.01); H01L 33/20 (2010.01); H01L 33/32 (2010.01); H01L 51/00 (2006.01);
U.S. Cl.
CPC ...
H01L 27/3248 (2013.01); G09G 3/2018 (2013.01); G09G 3/3225 (2013.01); G09G 3/3233 (2013.01); G09G 3/3241 (2013.01); G09G 3/3258 (2013.01); G09G 3/3283 (2013.01); H01L 27/12 (2013.01); H01L 27/124 (2013.01); H01L 27/1255 (2013.01); H01L 27/15 (2013.01); H01L 27/3244 (2013.01); H01L 27/3258 (2013.01); H01L 27/3262 (2013.01); H01L 27/3265 (2013.01); H01L 27/3276 (2013.01); H01L 27/3279 (2013.01); H01L 51/5259 (2013.01); G09G 3/2022 (2013.01); G09G 3/22 (2013.01); G09G 3/325 (2013.01); G09G 2300/04 (2013.01); G09G 2300/0426 (2013.01); G09G 2300/0814 (2013.01); G09G 2300/0842 (2013.01); G09G 2300/0861 (2013.01); G09G 2300/0866 (2013.01); G09G 2310/027 (2013.01); G09G 2310/0256 (2013.01); G09G 2310/0262 (2013.01); G09G 2310/0286 (2013.01); G09G 2310/0291 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/043 (2013.01); G09G 2320/045 (2013.01); G09G 2330/028 (2013.01); G09G 2330/04 (2013.01); G09G 2330/045 (2013.01); H01L 27/1285 (2013.01); H01L 27/13 (2013.01); H01L 29/4908 (2013.01); H01L 29/66757 (2013.01); H01L 33/20 (2013.01); H01L 33/32 (2013.01); H01L 51/0036 (2013.01); H01L 51/0038 (2013.01); H01L 51/0039 (2013.01); H01L 51/0059 (2013.01); H01L 51/0073 (2013.01); H01L 51/0081 (2013.01); H01L 51/0085 (2013.01); H01L 51/0087 (2013.01); H01L 2227/323 (2013.01); H01L 2251/308 (2013.01);
Abstract

By controlling the luminance of light emitting element not by means of a voltage to be impressed to the TFT but by means of controlling a current that flows to the TFT in a signal line drive circuit, the current that flows to the light emitting element is held to a desired value without depending on the characteristics of the TFT. Further, a voltage of inverted bias is impressed to the light emitting element every predetermined period. Since a multiplier effect is given by the two configurations described above, it is possible to prevent the luminance from deteriorating due to a deterioration of the organic luminescent layer, and further, it is possible to maintain the current that flows to the light emitting element to a desired value without depending on the characteristics of the TFT.

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