Thin film transistor substrate and display apparatus

• US 10,234,739 B2
• Filed: 11/04/2016
• Issued: 03/19/2019
• Est. Priority Date: 12/10/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Jeon, Yeonmun, Song, Minchul, Lim, Seongsu, Kim, Yanghee
• Primary Examiner(s): Nguyen, Hoan C
• Application Number:
  US15/344,224
• Publication Number:
  US 20170168332A1
• Time in Patent Office: 865 Days
• Field of Search: 349 43
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers
• CPC Class Codes: H01L 27/1222 with a particular composition, shape or crystalline structure of the active layer
• CPC Class Codes: H01L 27/1225 with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 29/0847 of field-effect transistors with insulated gate H01L29/0653 takes precedence; with a passive supplementary region between source or drain and substrate related to punch-through, capacity or isolation phenomena H01L29/1079; with LDD or DDD structure H01L29/7833; for thin film transistors H01L29/78618

Abstract

A thin film transistor substrate includes a substrate and thin film transistors arranged in first and second directions above the substrate. Each thin film transistor includes a gate electrode, a drain electrode, a source electrode and a semiconductor layer. The drain electrode is above the gate electrode and includes a first drain oblique portion and a second drain oblique portion extending from an end portion of the first drain oblique portion. The source electrode is spaced apart from the drain electrode above the gate electrode and includes a first source oblique portion and a second source oblique portion extending from an end portion of the first source oblique portion. The semiconductor layer at least partially overlaps the gate electrode and includes a drain region to which the drain electrode is connected, a source region to which the source electrode is connected, and a channel region therebetween.

Claims

1. A display apparatus comprising:

a substrate;

a plurality of thin film transistors arranged in a first direction and a second direction above the substrate;

a plurality of pixels arranged in the first direction and the second direction on the substrate; and

a plurality of data lines each connected to thin film transistors arranged in the second direction among the plurality of thin film transistors;

wherein each of the plurality of thin film transistors is included in a corresponding pixel among the plurality of pixels, and comprises;

a gate electrode on the substrate;

a drain electrode above the gate electrode, and comprising;

a first drain oblique portion extending in a direction between the first direction and the second direction, and

a second drain oblique portion extending from an end portion of the first drain oblique portion in a direction between a direction opposite to the first direction and the second direction;

a source electrode spaced apart from the drain electrode above the gate electrode, and comprising;

a first source oblique portion extending in the direction between the first direction and the second direction, and

a second source oblique portion extending from an end portion of the first source oblique portion in a direction between the direction opposite to the first direction and the second direction; and

a semiconductor layer at least partially overlapping the gate electrode, and comprising;

a drain region to which the drain electrode is connected,

a source region to which the source electrode is connected, and

a channel region between the drain region and the source region,

wherein each of the plurality of data lines includes connection parts and drain electrode parts, the drain electrode parts including the drain electrode of each of the thin film transistors arranged in the second direction,

wherein each of connecting parts directly connects the second drain oblique portion of a first thin film transistor to the first drain oblique portion of a second thin film transistor adjacent to the first thin film transistor in the second direction.

2. The display apparatus of claim 1, wherein plane shapes of the drain electrode and the source electrode viewed in a third direction perpendicular to the first and second directions are a left angle bracket “

<

”

or a right angle bracket “

>

”

.

3. The display apparatus of claim 1, wherein:

the drain electrode further comprises a third drain oblique portion extending from an end portion of the second drain oblique portion in the direction between the first direction and the second direction, and

the source electrode further comprises a first source oblique portion extending from an end portion of the second source oblique portion in the direction between the first direction and the second direction.

4. The display apparatus of claim 3, wherein plane shapes of the drain electrode and the source electrode viewed in the third direction perpendicular to the first and second directions are zigzag.

5. The display apparatus of claim 1, further comprising:

a plurality of gate lines extending in the first direction and connecting gate electrodes of thin film transistors arranged in the first direction among the plurality of thin film transistors; and

a plurality of data lines extending in the second direction and connecting drain electrodes of thin film transistors arranged in the second direction among the plurality of thin film transistors.

6. The display apparatus of claim 5, wherein:

each of the plurality of data lines comprises a plurality of data linear portions linearly extending in the second direction, and

each of the plurality of data linear portions is between drain electrodes of two neighboring thin film transistors among the plurality of transistors.

7. The display apparatus of claim 5, wherein:

each of the plurality of data lines comprises a plurality of connection portions connecting drain electrodes of two neighboring thin film transistors among the plurality of thin film transistors in the second direction, and

each of the plurality of connection portions comprises;

a first data oblique portion extending from an end portion of a second drain oblique portion of a drain electrode of a first thin film transistor of the two neighboring thin film transistors in a direction opposite to the first direction and the second direction, and

a second data oblique portion extending from an end portion of the first drain oblique portion to an end portion of a first drain oblique portion of a drain electrode of a second thin film transistor of the two neighboring thin film transistors in a direction between the first direction and the second direction.

8. The display apparatus of claim 7, wherein:

an angle between a direction in which the second drain oblique portion extends and the second direction is greater than an angle between a direction in which the first data oblique portion extends and the second direction, and

an angle between a direction in which the first drain oblique portion extends and the second direction is greater than an angle between a direction in which the second data oblique portion extends and the second direction.

9. The display apparatus of claim 7, wherein:

an angle between a direction in which the second drain oblique portion extends and the second direction is the same as an angle between a direction in which the first data oblique portion extends and the second direction, and

an angle between a direction in which the first drain oblique portion extends and the second direction is the same as an angle between a direction in which the second data oblique portion extends and the second direction.

10. The display apparatus of claim 1, wherein:

a plane shape of the drain electrode viewed in a third direction perpendicular to the first and second directions corresponds to a plane shape of the source electrode viewed in the third direction, and

the source electrode is spaced apart from the drain electrode in the first direction.

11. The display apparatus of claim 1, wherein:

a plane shape of the drain electrode viewed in a third direction perpendicular to the first and second directions corresponds to a plane shape of the source electrode viewed in the third direction, and

the source electrode is spaced apart from the drain electrode in a direction opposite to the first direction.

12. The display apparatus of claim 1, wherein each of the plurality of thin film transistors is arranged in a center area of a pixel corresponding to the thin film transistor among the plurality of pixels.

13. The display apparatus of claim 1, further comprising:

a plurality of pixel electrodes respectively connected to source electrodes of the plurality of thin film transistors and included in the plurality of pixels; and

a liquid crystal layer on the plurality of pixel electrodes.

14. The display apparatus of claim 1, wherein an angle between a direction in which each of the first and second drain oblique portions and the first and second source oblique portions extends and the second direction is between about 30°

and about 60°

.

15. The display apparatus of claim 1, wherein the connection parts and the drain electrode parts are alternately extended.

16. A display apparatus comprising:

a substrate;

a plurality of thin film transistors arranged in a first direction and a second direction above the substrate;

a plurality of pixels comprising the plurality of thin film transistors;

a plurality of gate lines extending in the first direction and connecting gate electrodes of thin film transistors arranged in the first direction among the plurality of thin film transistors; and

a plurality of data lines extending in the second direction and connecting drain electrodes of thin film transistors arranged in the second direction among the plurality of thin film transistors,

wherein each of the plurality of thin film transistors comprises;

a gate electrode on the substrate;

a drain electrode above the gate electrode, and comprising;

a first drain oblique portion extending in a direction between the first direction and the second direction, and

a second drain oblique portion extending from an end portion of the first drain oblique portion in a direction between a direction opposite to the first direction and the second direction;

a source electrode spaced apart from the drain electrode above the gate electrode, and comprising;

a first source oblique portion extending in the direction between the first direction and the second direction, and

a second source oblique portion extending from an end portion of the first source oblique portion in a direction between the direction opposite to the first direction and the second direction; and

a semiconductor layer at least partially overlapping the gate electrode, and comprising;

a drain region to which the drain electrode is connected,

a source region to which the source electrode is connected, and

a channel region between the drain region and the source region,

wherein the plurality of gate lines connect gate electrodes of thin film transistors arranged in the first direction among the plurality of thin film transistors, and the plurality of data lines connect drain electrodes of thin film transistors arranged in the second direction among the plurality of thin film transistors

wherein each of the plurality of data lines comprises a plurality of connection portions connecting drain electrodes of two neighboring thin film transistors among the plurality of thin film transistors in the second direction.

17. The display apparatus of claim 16, wherein each of the plurality of connection portions comprises:

a first data oblique portion extending from an end portion of a second drain oblique portion of a drain electrode of a first thin film transistor of the two neighboring thin film transistors in a direction opposite to the first direction and the second direction, and

a second data oblique portion extending from an end portion of the first drain oblique portion to an end portion of a first drain oblique portion of a drain electrode of a second thin film transistor of the two neighboring thin film transistors in a direction between the first direction and the second direction.

18. The display apparatus of claim 17, wherein:

an angle between a direction in which the second drain oblique portion extends and the second direction is greater than an angle between a direction in which the first data oblique portion extends and the second direction, and

an angle between a direction in which the first drain oblique portion extends and the second direction is greater than an angle between a direction in which the second data oblique portion extends and the second direction.

19. The display apparatus of claim 17, wherein:

an angle between a direction in which the second drain oblique portion extends and the second direction is the same as an angle between a direction in which the first data oblique portion extends and the second direction, and

an angle between a direction in which the first drain oblique portion extends and the second direction is the same as an angle between a direction in which the second data oblique portion extends and the second direction.