US 12,217,694 B2
Display device and method of manufacturing the same
Keun Woo Kim, Yongin-si (KR); Mee Jae Kang, Yongin-si (KR); Doo Na Kim, Yongin-si (KR); Yun Jung Oh, Yongin-si (KR); Yong Su Lee, Yongin-si (KR); and Jae Hwan Chu, Yongin-si (KR)
Assigned to Samsung Display Co., Ltd., Yongin-si (KR)
Filed by Samsung Display Co., Ltd., Yongin-si (KR)
Filed on Apr. 15, 2020, as Appl. No. 16/849,882.
Claims priority of application No. 10-2019-0101685 (KR), filed on Aug. 20, 2019.
Prior Publication US 2021/0057458 A1, Feb. 25, 2021
Int. Cl. G09G 3/3266 (2016.01); G09G 3/20 (2006.01); H01L 27/12 (2006.01)
CPC G09G 3/3266 (2013.01) [G09G 3/20 (2013.01); H01L 27/1229 (2013.01); H01L 27/1251 (2013.01); H01L 27/1285 (2013.01); G09G 2300/08 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A display device comprising:
a plurality of pixels connected to gate lines and data lines;
a gate driver to supply a gate signal to the gate lines; and
a data driver to supply a data signal to the data lines;
wherein the gate driver comprises:
a first transistor comprising a first active layer at a first layer;
a second transistor comprising a second active layer at a second layer on the first layer; and
an insulating layer on the second layer to cover the second active layer,
wherein the first and second transistors are different from pixel transistors of the plurality of pixels,
wherein the first active layer and the second active layer overlap with each other in a plan view and at least one contact hole penetrates through the insulating layer to expose a region of the first active layer that does not overlap with the second active layer in the plan view, and
wherein:
the first transistor further includes a first source electrode, a first drain electrode, and a first gate;
the second transistor further includes a second source electrode, a second drain electrode, and a second gate;
the at least one contact hole includes a first contact hole and a second contact hole;
the first source electrode fills the first contact hole such that the first source electrode and a portion of the first active layer are electrically connected to each other;
the first drain electrode fills the second contact hole such that the first drain electrode and another portion of the first active layer are electrically connected to each other;
the second source electrode is electrically connected to a portion of the second active layer;
the second drain electrode is electrically connected to another portion of the second active layer;
the display device further comprises:
a first insulating layer disposed between the first active layer and the first gate; and
a second insulating layer disposed between the first gate and the second active layer;
the insulating layer includes a third insulating layer, and a fourth insulating layer on the third insulating layer;
at least a portion of the third insulating layer is disposed between the second active layer and the second gate;
an upper surface of the fourth insulating layer contacts the first source electrode, the second source electrode, the first drain electrode, and the second drain electrode; and
the first source electrode, the second source electrode, the first drain electrode, and the second drain electrode are disposed on a same layer.