SYSTEM AND METHOD FOR MATCHING ELECTRODE RESISTANCES IN OLED LIGHT PANELS

• US 20190326541A1
• Filed: 06/25/2019
• Published: 10/24/2019
• Est. Priority Date: 12/13/2012
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: PANG, Huiqing, MA, Ruiqing
• Granted Patent: US 10,797,258 B2
• Time in Patent Office: Days
• CPC Class Codes: H01J 1/62 Luminescent screens; Selection of materials for luminescent coatings on vessels
• CPC Class Codes: H10K 2101/00 Properties of the organic materials covered by group H10K85/00
• CPC Class Codes: H10K 2101/40 Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/155 comprising dopants
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/813 characterised by their shape
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/822 characterised by their shape
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/60 Forming conductive regions or layers, e.g. electrodes

Abstract

Provided are an OLED device and a method of manufacturing the OLED device that may provide improved luminance uniformity. The disclosed OLED may have a first electrode that has a first sheet resistance Rs, and a second electrode that has a second sheet resistance, wherein the second sheet resistance may be in the range of 0.3 Rs-1.3 Rs. In addition, the disclosed OLED may have a plurality of equal potential difference between points on a first electrode and a second electrode. The equal potential difference may be provided by a gradient resistance formed on at least one of the electrodes.

Claims

1-43. -43. (canceled)

44. A method of fabricating an electrode for an organic light emitting device, comprising:

obtaining a first electrode material source;

disposing the first electrode material source over a substrate;

arranging the substrate at an angle θ

relative to a line normal to the substrate from the first electrode material source, where 0<

θ

<

90°

; and

depositing the first electrode material from the first electrode material source onto the substrate to form a first electrode having a non-uniform thickness.

45. The method of claim 44, wherein the thickness is greater on one end of the first electrode and decreases gradually to the other end of the first electrode.

49. The method of claim 44, further comprising:

depositing the first electrode material to form an electrode contact for an electrode on a single edge of the electrode.

50. The method of claim 44, further comprising:

disposing a mask between a deposition device used to deposit the electrode material and the substrate concurrently with depositing the first electrode material over the substrate.

51. The method of claim 44, wherein the first electrode material is deposited over the substrate in multiple passes of the substrate beneath a deposition device used to deposit the first electrode material over the substrate.

52. The method of claim 44, wherein the first electrode material is deposited over the substrate in a single pass of the substrate beneath a deposition device used to deposit the first electrode material over the substrate to form the first electrode.

53. The method of claim 44, wherein the depositing the first electrode material is performed within a linear vacuum deposition system.

54. The method of claim 44, further comprising:

selecting the non-uniform thickness to result in a selected gradient resistance of the first electrode after deposition of the first electrode material.

55. The method of claim 44, further comprising:

moving the substrate relative to an electrode material deposition device at a constant rate.

46. A method of fabricating an electrode for an organic light emitting device, comprising:

depositing a plurality of layers of an electrode material through each of a series of shadow masks, each shadow mask in the series of shadow masks having a smaller area through which the electrode material is deposited than the previous shadow mask in the series.

47. A method of fabricating an electrode for an organic light emitting device, comprising:

passing a substrate through a plurality of positions in a linear deposition system; and

at each position, depositing electrode material over the substrate at a different thickness and over a different portion of an area of the substrate than at each of the other positions.

48. The method of claim 47, further comprising moving the substrate through the plurality of positions at a varied speed to cause the electrode material to be deposited at a different thickness at each position.