ORGANIC LIGHT EMITTING DIODE DISPLAY AND MANUFACTURING METHOD THEREOF

• US 20070159433A1
• Filed: 01/10/2007
• Published: 07/12/2007
• Est. Priority Date: 01/10/2006
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: CHOI, Joon-Hoo
• Granted Patent: US 8,040,298 B2
• Time in Patent Office: Days
• US Class Current: 345/92
• CPC Class Codes: G09G 2300/0417 Special arrangements specific to the use of low carrier mobility technology
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/0214 with crosstalk due to leakage current of pixel switch in active matrix panels
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1222 with a particular composition, shape or crystalline structure of the active layer
• CPC Class Codes: H01L 29/78678 with inverted-type structure, e.g. with bottom gate
• CPC Class Codes: H01L 29/78696 characterised by the structure of the channel, e.g. multichannel, transverse or longitudinal shape, length or width, doping structure, or the overlap or alignment between the channel and the gate, the source or the drain, or the contacting structure of the channel H01L29/78612 takes precedence; transistors having a drain offset region or a lightly doped drain [LDD] H01L29/78621
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals

Abstract

An OLED display according to an exemplary embodiment of the present invention includes a substrate, a gate line formed on the substrate and including a first control electrode, a data line intersecting the gate line, a switching TFT connected to the gate line and the data line, a driving TFT connected to the switching TFT, a first electrode connected to the driving TFT, a second electrode facing the first electrode, and a light emitting member formed between the first electrode and the second electrode. At least one of the switching TFT and the driving TFT includes a plurality of channels.

Claims

1. An organic light emitting diode display comprising:

a substrate;

a gate line formed on the substrate and including a first control electrode;

a data line intersecting the gate line;

a switching TFT connected to the gate line and the data line;

a driving TFT connected to the switching TFT;

a first electrode connected to the driving TFT;

a second electrode facing the first electrode; and

a light emitting member formed between the first electrode and the second electrode,

wherein at least one of the switching TFT and the driving TFT each includes a plurality of channels.

2. The organic light emitting diode display of claim 1, wherein the switching TFT includes a polycrystalline semiconductor.

3. The organic light emitting diode display of claim 1, wherein the driving TFT includes a polycrystalline semiconductor.

4. The organic light emitting diode display of claim 1, further comprising a secondary gate line substantially parallel to the gate line and including a secondary control electrode.

5. The organic light emitting diode display of claim 4, wherein the secondary gate line is supplied with a voltage different from that of the gate line.

6. The organic light emitting diode display of claim 5, wherein the secondary gate line is supplied with a positive voltage when the gate line is supplied with a gate-off voltage.

7. The organic light emitting diode display of claim 5, wherein the secondary gate line is floating when the gate line is supplied with a gate-off voltage.

8. The organic light emitting diode display of claim 4, wherein the secondary control electrode includes a first secondary control electrode and a second secondary control electrode, and the first control electrode is located between the first secondary control electrode and the second secondary control electrode.

9. The organic light emitting diode display of claim 8, wherein each interval between the first control electrode, and the first secondary control electrode and the second secondary control electrode, is about 4 μ

m or less.

10. The organic light emitting diode display of claim 8, wherein the plurality of channels include a first channel formed on the first secondary control electrode, a second channel formed on the first control electrode and a third channel formed on the second secondary control electrode.

11. The organic light emitting diode display of claim 10, wherein the first, second and third channels are formed on a polycrystalline semiconductor.

12. The organic light emitting diode display of claim 8, wherein the switching TFT comprises:

a first switching TFT including the first secondary control electrode, a first input electrode connected to the data line, and a first output electrode facing the first input electrode;

a second switching TFT including the first control electrode, a second input electrode connected to the first output electrode, and a second output electrode facing the second input electrode; and

a third switching TFT including the second secondary control electrode, a third input electrode connected to the second output electrode, and a third output electrode facing the third input electrode.

13. The organic light emitting diode display of claim 12, wherein the first switching TFT, the second switching TFT and the third switching TFT include a polycrystalline semiconductor.

14. An organic light emitting diode display, comprising:

a substrate;

a gate line formed on the substrate and including a first control electrode;

a secondary gate line substantially parallel to the gate line;

a secondary control electrode connected to the secondary gate line, and including a first portion and a second portion;

a first semiconductor formed on the first control electrode and the secondary control electrode;

a data line intersecting the gate line and the secondary gate line;

a first input electrode connected to the data line, and partially overlapping the first semiconductor;

a first input and output electrode partially overlapping the first portion of the secondary control electrode and the first control electrode, and including a portion facing the first input electrode;

a second input and output electrode partially overlapping the second portion of the secondary control electrode, and including a portion facing the first input and output electrode;

a first output electrode partially overlapping the second portion of the secondary control electrode, and including a portion facing the second input and output electrode;

a second control electrode connected to the first output electrode;

a second semiconductor formed on the second control electrode;

a second input electrode and a second output electrode partially overlapping the second semiconductor;

a first electrode connected to the second output electrode;

a second electrode facing the first electrode; and

a light emitting member formed between the first electrode and the second electrode.

15. The organic light emitting diode display of claim 14, wherein the secondary control electrode surrounds the first control electrode, and the first control electrode is located between the first portion of the secondary control electrode and the second portion of the secondary control electrode.

16. The organic light emitting diode display of claim 15, wherein the secondary control electrode and the first control electrode are separated from each other by an interval of about 4 μ

m.

17. The organic light emitting diode display of claim 14, wherein the first input electrode, the first input and output electrode, the second input and output electrode and the first output electrode are connected to each other by the first semiconductor.

18. The organic light emitting diode display of claim 14, wherein the first semiconductor and the second semiconductor include a polycrystalline semiconductor.

19. The organic light emitting diode display of claim 14, wherein the secondary gate line is supplied with a voltage different from that of the gate line.

20. The organic light emitting diode display of claim 19, wherein the secondary gate line is supplied with a positive voltage when the gate line is supplied with a gate-off voltage.

21. The organic light emitting diode display of claim 19, wherein the secondary gate line is floating when the gate line is supplied with a gate-off voltage.

22. A method of manufacturing an organic light emitting diode display, the method comprising:

forming gate conductors including a gate line including a first control electrode, a secondary gate line including a secondary control electrode, and a second control electrode on a substrate;

forming a gate insulating layer and a semiconductor layer on the gate conductors and the substrate;

crystallizing the semiconductor layer;

forming data conductors including a data line, a driving voltage line, a plurality of input electrodes, and a plurality of output electrodes on the crystallized semiconductor layer;

forming a first electrode connected to one of the plurality of output electrodes;

forming a light emitting member on the first electrode; and

forming a second electrode on the light emitting member.

23. The method of claim 22, wherein the crystallization of the semiconductor layer is performed using solid phase crystallization.

24. The method of claim 22, wherein the forming of the gate insulating layer and the semiconductor layer includes forming an ohmic contact layer on the semiconductor layer, simultaneously.