Display device

• US 9,525,017 B2
• Filed: 09/09/2015
• Issued: 12/20/2016
• Est. Priority Date: 09/12/2014
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Shishido, Hideaki, Miyake, Hiroyuki, Toyotaka, Kouhei, Kaneyasu, Makoto
• Primary Examiner(s): Potter, Roy
• Assistant Examiner(s): PATTON, PAUL E
• Application Number:
  US14/848,698
• Publication Number:
  US 20160079333A1
• Time in Patent Office: 468 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 1/136277 formed on a semiconductor substrate, e.g. of silicon
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: G09G 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 3/2085 Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
• 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 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/35 : comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/351 : comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/352 : the areas of the RGB subpixels being different
• CPC Class Codes: H10K 59/353 : characterised by the geometrical arrangement of the RGB subpixels
• CPC Class Codes: H10K 59/40 : OLEDs integrated with touch screens

Abstract

Provided is a display device with high resolution, high display quality, or high aperture ratio. A pixel includes three subpixels and is electrically connected to two gate lines. One of the gate lines is electrically connected to a gate of a transistor included in each of the two subpixels, and the other gate line is electrically connected to a gate of a transistor included in the other subpixel. Display elements of the three subpixels are arranged in the same direction. Three pixel electrodes of the three subpixels are arranged in the same direction.

Claims

1. A display device comprising:

a pixel comprising a first subpixel, a second subpixel, and a third subpixel;

a first wiring; and

a second wiring,

wherein the first subpixel comprises a first transistor and a first display element,

wherein the second subpixel comprises a second transistor and a second display element,

wherein the third subpixel comprises a third transistor and a third display element,

wherein the first wiring is electrically connected to a gate of the first transistor and a gate of the second transistor,

wherein the second wiring is electrically connected to a gate of the third transistor,

wherein the first display element comprises a first electrode,

wherein the second display element comprises a second electrode

wherein the third display element comprises a third electrode, and

wherein the third electrode is provided between the first electrode and the second electrode,

wherein the first electrode and the second wiring are not overlapped with each other,

wherein the second electrode and the second wiring are not overlapped with each other, and

wherein the third electrode and the first wiring are overlapped with each other.

2. The display device according to claim 1, wherein a straight line through a centroid of the first electrode and a centroid of the second electrode does not overlap with a centroid of the third electrode in a plane view.

3. The display device according to claim 1, wherein a resolution is more than or equal to 400 ppi and less than or equal to 2000 ppi.

4. The display device according to claim 1, comprising a circuit,

wherein the circuit has a function of selectively outputting current flowing through the first display element, and

wherein the circuit has a function of supplying a predetermined potential to the first display element.

5. A display device comprising:

a first pixel comprising a first subpixel, a second subpixel, and a third subpixel;

a second pixel comprising a fourth subpixel, a fifth subpixel, and a sixth subpixel;

a first wiring;

a second wiring;

a third wiring;

a fourth wiring; and

a fifth wiring,

wherein the first subpixel comprises a first transistor and a first display element,

wherein the second subpixel comprises a second transistor and a second display element,

wherein the third subpixel comprises a third transistor and a third display element,

wherein the fourth subpixel comprises a fourth transistor and a fourth display element,

wherein the fifth subpixel comprises a fifth transistor and a fifth display element,

wherein the sixth subpixel comprises a sixth transistor and a sixth display element,

wherein the first wiring is electrically connected to a gate of the first transistor, a gate of the second transistor, and a gate of the fourth transistor,

wherein the second wiring is electrically connected to a gate of the third transistor, a gate of the fifth transistor, and a gate of the sixth transistor,

wherein one of a source and a drain of the first transistor is electrically connected to the third wiring,

wherein one of a source and a drain of the second transistor is electrically connected to the fourth wiring,

wherein one of a source and a drain of the third transistor is electrically connected to the third wiring,

wherein one of a source and a drain of the fourth transistor is electrically connected to the fifth wiring,

wherein one of a source and a drain of the fifth transistor is electrically connected to the fourth wiring, and

wherein one of a source and a drain of the sixth transistor is electrically connected to the fifth wiring.

6. The display device according to claim 5,

wherein the first display element comprises a first electrode,

wherein the second display element comprises a second electrode,

wherein the third display element comprises a third electrode,

wherein the fourth display element comprises a fourth electrode,

wherein the fifth display element comprises a fifth electrode,

wherein the sixth display element comprises a sixth electrode,

wherein the third electrode is provided between the first electrode and the second electrode,

wherein the fourth electrode is provided between the fifth electrode and the sixth electrode, and

wherein the second electrode is adjacent to the fifth electrode.

7. The display device according to claim 6,

wherein a centroid of the first electrode, a centroid of the second electrode, and a centroid of the fourth electrode are in a first line,

wherein a centroid of the third electrode, a centroid of the fifth electrode, and a centroid of the sixth electrode are in a second line, and

the first line is parallel to and does not overlap with the second line.

8. The display device according to claim 6,

wherein the first electrode and the second wiring are not overlapped with each other,

wherein the second electrode and the second wiring are not overlapped with each other,

wherein the third electrode and the first wiring are overlapped with each other

wherein the fourth electrode and the second wiring are not overlapped with each other,

wherein the fifth electrode and the first wiring are overlapped with each other, and

wherein the sixth electrode and the first wiring are overlapped with each other.

9. The display device according to claim 5,

wherein the first display element and the fifth display element have a function of emitting light of a first color,

wherein the second display element and the sixth display element have a function of emitting light of a second color, and

wherein the third display element and the fourth display element have a function of emitting light of a third color.

10. The display device according to claim 5, wherein a resolution is more than or equal to 400 ppi and less than or equal to 2000 ppi.

11. The display device according to claim 5, comprising a circuit,

wherein the circuit has a function of selectively outputting current flowing through the first display element, and

wherein the circuit has a function of supplying a predetermined potential to the first to third display element.

12. A display device comprising:

a first pixel comprising a first subpixel, a second subpixel, and a third subpixel;

a first wiring; and

a second wiring,

wherein the first subpixel comprises a first transistor and a first display element comprising a first electrode,

wherein the second subpixel comprises a second transistor and a second display element comprising a second electrode,

wherein the third subpixel comprises a third transistor and a third display element comprising a third electrode,

wherein the first wiring is electrically connected to a gate of the first transistor and a gate of the second transistor,

wherein the second wiring is electrically connected to a gate of the third transistor,

wherein the first electrode, the second electrode, and the third electrode are along a first direction parallel to the first wiring,

wherein the first transistor and the second transistor are along the first direction, and

wherein the first transistor and the third transistor are along a second direction perpendicular to the first wiring.

13. The display device according to claim 12, wherein the third electrode is provided between the first electrode and the second electrode.

14. The display device according to claim 12, further comprising:

a second pixel comprising a fourth subpixel, a fifth subpixel, and a sixth subpixel;

wherein the fourth subpixel comprises a fourth transistor and a fourth display element comprising a fourth electrode,

wherein the fifth subpixel comprises a fifth transistor and a fifth display element comprising a fifth electrode,

wherein the sixth subpixel comprises a sixth transistor and a sixth display element comprising a sixth electrode,

wherein the first wiring is electrically connected to the gate of the first transistor, the gate of the second transistor, and a gate of the fourth transistor,

wherein the second wiring is electrically connected to the gate of the third transistor, a gate of the fifth transistor, and a gate of the sixth transistor, and

wherein the fourth electrode, the fifth electrode, and the sixth electrode are along the first direction.

15. The display device according to claim 14,

wherein the first transistor, the second transistor, and the fourth transistor are along the first direction,

wherein the third transistor, the fifth transistor, and the sixth transistor are along the first direction,

wherein the first transistor and the third transistor are along the second direction,

wherein the second transistor and the fifth transistor are along the second direction, and

wherein the fourth transistor and the sixth transistor are along the second direction.

16. A display device comprising:

a pixel comprising a first subpixel, a second subpixel, and a third subpixel;

a first wiring;

a second wiring;

a third wiring; and

a fourth wiring,

wherein the first subpixel comprises a first transistor and a first display element,

wherein the second subpixel comprises a second transistor and a second display element,

wherein the third subpixel comprises a third transistor and a third display element,

wherein the first wiring is electrically connected to a gate of the first transistor and a gate of the second transistor,

wherein the second wiring is electrically connected to a gate of the third transistor,

wherein the third wiring is electrically connected to one of a source and a drain of the first transistor and one of a source and a drain of the third transistor, and

wherein the fourth wiring is electrically connected to one of a source and a drain of the second transistor.

17. The display device according to claim 16,

wherein the first display element can emit light of red color,

wherein the second display element can emit light of blue color, and

wherein the third display element can emit light of green color.

18. The display device according to claim 16,

wherein the first transistor and the second transistor are arranged in a first direction which is parallel to the first wiring, and

wherein the first transistor and the third transistor are arranged in a second direction which is parallel to the third wiring.

19. The display device according to claim 16, wherein a resolution is more than or equal to 400 ppi and less than or equal to 2000 ppi.

20. The display device according to claim 16, comprising a circuit,

wherein the circuit has a function of selectively outputting current flowing through the first display element, and

wherein the circuit has a function of supplying a predetermined potential to the first display element.