ORGANIC LIGHT EMITTING DIODE DISPLAY

• US 20140332768A1
• Filed: 09/18/2013
• Published: 11/13/2014
• Est. Priority Date: 05/09/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Group)
• Original Assignee: Samsung Display Company Limited (Samsung Group)
• Inventors: KWON, Do-Hyun, LEE, Il-Jeong, IM, Choong-Youl, YOON, Ju-Won, KO, Moo-Soon, WOO, Min-Woo
• Granted Patent: US 9,135,852 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/045 Compensation of drifts in the characteristics of light emitting or modulating elements
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• 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 27/1251 comprising TFTs having a different architecture, e.g. top- and bottom gate TFTs
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals

Abstract

A display includes a switching transistor connected to a scan line and data line, a driving transistor connected to the switching transistor, a storage capacitor between a voltage line and the driving transistor, and an organic light emitting diode connected to the driving transistor. The data line and voltage line are at different layers, and the data line and a gate electrode of the driving transistor are at different layers. Also, a plate of the storage capacitor and the gate electrode of the driving transistor are of a same layer, and semiconductor layers of the switching and driving transistors are of a same layer.

Claims

1. An organic light emitting diode (OLED) display comprising:

a substrate;

a scan line on the substrate to transmit a scan signal;

a data line and a driving voltage line crossing the scan line, the data line and driving voltage line to respectively transmit a data signal and a driving voltage;

a switching transistor connected to the scan line and the data line and including a semiconductor layer, a gate electrode, and a drain electrode;

a driving transistor connected to the drain electrode of the switching transistor and including a semiconductor layer and a gate electrode; and

an organic light emitting diode connected to the drain electrode of the driving transistor, wherein the data line and the driving voltage line are at different layers, and wherein the data line and the gate electrode of the driving transistor are at different layers.

2. The display as claimed in claim 1, wherein the gate electrode of the driving transistor and the gate electrode of the switching transistor are at different layers.

3. The display as claimed in claim 2, further comprising:

a first gate insulating layer over the semiconductor layers of the driving and switching transistors; and

a second gate insulating layer on the first gate insulating layer and over the gate electrode of the switching transistor, wherein the gate electrode of the driving transistor is on the second gate insulating layer.

4. The display as claimed in claim 3, further comprising:

a first interlayer insulating layer over the gate electrode of the driving transistor; and

a second interlayer insulating layer over the data line formed on the first interlayer insulating layer, wherein the driving voltage line is formed on the second interlayer insulating layer.

5. The display as claimed in claim 4, further comprising

a storage capacitor including a first plate formed of a same layer as the gate electrode of the switching transistor and a second plate on the second gate insulating layer over the first plate, wherein the driving voltage line is connected to the second plate.

6. The display as claimed in claim 5, wherein the second gate insulating layer includes a high dielectric constant material.

7. The display as claimed in claim 6, wherein the second gate insulating layer includes one selected from HfOx, ZrOx, AlOx, and SiOx.

8. The display as claimed in claim 7, wherein the second plate is formed of a same material and is of a same layer as the gate electrode of the driving transistor.

9. An organic light emitting diode (OLED) display comprising:

a substrate;

a scan line on the substrate to transmit a scan signal;

a data line and a driving voltage line crossing the scan line, the data line and driving voltage line to respectively transmit a data signal and a driving voltage;

a switching transistor connected to the scan line and the data line and including a semiconductor layer and a gate electrode and a drain electrode;

a driving transistor connected to the drain electrode of the switching transistor and including a semiconductor layer and a gate electrode; and

an organic light emitting diode connected to the drain electrode of the driving transistor, wherein the data line and the driving voltage line are at different layers, and wherein the data line and the driving gate electrode are at a same layer.

10. The display as claimed in claim 9, wherein the gate electrode of the driving transistor is at a different layer from the gate electrode of the switching transistor.

11. The display as claimed in claim 10, further comprising:

a first gate insulating layer over a semiconductor layer including the semiconductor layers of the switching and driving transistors; and

a second gate insulating layer on the first gate insulating layer and over the gate electrode of the switching transistor, wherein the gate electrode of the driving transistor is on the second gate insulating layer.

12. The display as claimed in claim 11, further comprising

an interlayer insulating layer over the gate electrode of the driving transistor and the data line, wherein the driving voltage line is on the interlayer insulating layer.

13. The display as claimed in claim 12, further comprising

a storage capacitor including a first plate formed of a same layer as the gate electrode of the switching transistor and a second plate on the second gate insulating layer over the first plate, wherein the driving voltage line is connected to the second plate.

14. The display as claimed in claim 13, wherein the second gate insulating layer includes a high dielectric constant material.

15. The display as claimed in claim 14, wherein the second gate insulating layer includes one selected from HfOx, ZrOx, AlOx, and SiOx.

16. The display as claimed in claim 15, wherein the second plate is formed of a same material and is of a same layer as the gate electrode of the driving transistor.