DISPLAY DEVICE AND ELECTRONIC DEVICE

• US 20140313446A1
• Filed: 04/10/2014
• Published: 10/23/2014
• Est. Priority Date: 04/19/2013
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: KUBOTA, Daisuke
• Granted Patent: US 9,915,848 B2
• Time in Patent Office: Days
• US Class Current: 349/43
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio
• 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 27/1255 integrated with passive devices, e.g. auxiliary capacitors

Abstract

A display device having fewer alignment defects is provided. A display device having a high aperture ratio and including a capacitor with increased charge capacity is provided. A display device having a high aperture ratio, including a capacitor with large charge capacity, and having fewer alignment defects is provided. The display device includes a pixel electrode, a transistor including a light-transmitting semiconductor layer connected to the pixel electrode, and a capacitor, a scan line, and a data line connected to the transistor. The transistor is arranged to overlap with the scan line. One of electrodes of the capacitor is formed on the same surface where the semiconductor layer is formed, and is formed in a region divided by the scan lines and the data lines. The other of the electrodes of the capacitor is a pixel electrode. The pixel electrode extends so as to intersect with the scan line.

Claims

1. A display device comprising:

a pixel electrode;

a transistor electrically connected to the pixel electrode, the transistor comprising a light-transmitting semiconductor layer;

a scan line electrically connected to the transistor;

a data line electrically connected to the transistor; and

a capacitor electrically connected to the transistor, the capacitor comprising an electrode and the pixel electrode,

wherein the transistor and the scan line overlap with each other,

wherein the electrode and the light-transmitting semiconductor layer are on a same surface, and

wherein the pixel electrode extends to intersect with the scan line.

2. The display device according to claim 1,

wherein the light-transmitting semiconductor layer comprises an oxide semiconductor.

3. The display device according to claim 2,

wherein the light-transmitting semiconductor layer comprises In, Zn, and M (M is a material selected from Al, Ga, Ge, Y, Zr, Sn, La, Ce, and Hf).

4. The display device according to claim 1,

wherein the scan line is positioned between a first part of the pixel electrode and a second part of the pixel electrode,

wherein the electrode comprises a first layer and a second layer, the first layer and the first part of the pixel electrode overlap with each other, and the second layer and the second part of the pixel electrode overlap with each other,

wherein the scan line is between the first layer and the second layer, and

wherein the first layer is electrically connected to the second layer through a capacitor line, and the capacitor line extends in a direction substantially parallel to the data line.

5. An electronic device comprising the display device according to claim 1.

6. A display device comprising:

a first substrate;

a second substrate;

a liquid crystal between the first substrate and the second substrate;

a pixel electrode over the first substrate;

a transistor electrically connected to the pixel electrode, the transistor comprising a light-transmitting semiconductor layer;

a scan line electrically connected to the transistor;

a data line electrically connected to the transistor; and

a capacitor electrically connected to the transistor, the capacitor comprising an electrode and the pixel electrode,

wherein the transistor and the scan line overlap with each other,

wherein the electrode and the light-transmitting semiconductor layer are on a same surface, and

wherein the pixel electrode extends to intersect with the scan line.

7. The display device according to claim 6,

wherein the light-transmitting semiconductor layer comprises an oxide semiconductor.

8. The display device according to claim 7,

wherein the light-transmitting semiconductor layer comprises In, Zn, and M (M is a material selected from Al, Ga, Ge, Y, Zr, Sn, La, Ce, and Hf).

9. The display device according to claim 6,

wherein the scan line is positioned between a first part of the pixel electrode and a second part of the pixel electrode,

wherein the electrode comprises a first layer and a second layer, the first layer and the first part of the pixel electrode overlap with each other, and the second layer and the second part of the pixel electrode overlap with each other,

wherein the scan line is between the first layer and the second layer, and

wherein the first layer is electrically connected to the second layer through a capacitor line, and the capacitor line extends in a direction substantially parallel to the data line.

10. An electronic device comprising the display device according to claim 6.

11. A display device comprising:

a first scan line;

a second scan line;

a data line;

a first pixel comprising;

a first transistor electrically connected to the first scan line and the data line, the first transistor comprising a first light-transmitting semiconductor layer;

a first pixel electrode electrically connected to the first transistor, wherein the first pixel electrode extends to intersect with the first scan line; and

a first capacitor electrically connected to the first transistor, the first capacitor comprising a first electrode and the first pixel electrode; and

a second pixel adjacent to the first pixel, the second pixel comprising;

a second transistor electrically connected to the second scan line and the data line, the second transistor comprising a second light-transmitting semiconductor layer;

a second pixel electrode electrically connected to the second transistor, wherein the second pixel electrode extends to intersect with the second scan line; and

a second capacitor electrically connected to the second transistor, the second capacitor comprising a second electrode and the second pixel electrode,

wherein the first electrode, the second electrode, the first light-transmitting semiconductor layer, and the second light-transmitting semiconductor layer are on a same surface, and

wherein the first electrode and the second electrode share a first layer.

12. The display device according to claim 11,

wherein the first light-transmitting semiconductor layer comprises an oxide semiconductor.

13. The display device according to claim 12,

wherein the first light-transmitting semiconductor layer comprises In, Zn, and M (M is a material selected from Al, Ga, Ge, Y, Zr, Sn, La, Ce, and Hf).

14. The display device according to claim 11,

wherein the first scan line is positioned between a first part of the first pixel electrode and a second part of the first pixel electrode,

wherein the first electrode comprises the first layer and a second layer, the first layer and the first part of the first pixel electrode overlap with each other, and the second layer and the second part of the first pixel electrode overlap with each other,

wherein the first scan line is between the first layer and the second layer, and

wherein the first layer is electrically connected to the second layer through a capacitor line, and the capacitor line extends in a direction substantially parallel to the data line.

15. An electronic device comprising the display device according to claim 11.