Method of fabricating flexible devices

• US 9,210,810 B2
• Filed: 07/12/2012
• Issued: 12/08/2015
• Est. Priority Date: 07/12/2012
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: Hack, Michael, Krall, Emory, Ma, Ruiqing
• Primary Examiner(s): Phan, Thiem
• Application Number:
  US13/547,985
• Publication Number:
  US 20140016284A1
• Time in Patent Office: 1,244 Days
• Field of Search: 298/29, 298/25, 298/32, 298/35, 298/46, 257/750, 349/150, 349/152
• US Class Current: 1/1
• CPC Class Codes: H05K 1/028 Bending or folding regions of flexible printed circuits H05K1/0283 takes precedence
• CPC Class Codes: H05K 1/118 specially for flexible printed circuits, e.g. using folded portions
• CPC Class Codes: H05K 2201/055 Folded back on itself
• CPC Class Codes: H05K 2201/10128 Display
• CPC Class Codes: Y02E 10/549 Organic PV cells
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

Systems and methods for the design and fabrication of flexible devices, including high-performance large-area OLEDs, narrow border display panels and lighting panels are provided. Various described fabrication- and design-processes may be used to provide the necessary electrical drive to lighting and display panels. Electrical drive may be provided to one or more row- and column-signals by patterning conductive elements near the panel edge. The electrical elements may further be folded over a region near the panel edge back on itself, such that electrical traces may route around the display edge. This may allow the display active area to be substantially the same area as its viewing area, and furthermore may allow pixels go substantially all the way to the edge of the viewing area.

Claims

1. A method, comprising:

providing a flexible substrate having a first surface and a second surface;

disposing a flexible Organic Light Emitting Device (OLED) having a device footprint over the first surface of the flexible substrate;

disposing one or more conductors over at least a portion of a first region of the first surface of the flexible substrate;

disposing a continuous barrier layer over the first surface of the flexible substrate; and

folding the flexible substrate along the first region, wherein the fold crosses the one or more conductors.

2. The method of claim 1, wherein the step of folding the flexible substrate is performed after disposing the one or more conductors.

3. The method of claim 1, wherein the step of disposing the one or more conductors over at least a portion of the first region of the first surface of the flexible substrate comprises:

disposing the one or more conductors on the first surface of the substrate up to, but not across, the first region; and

subsequent to folding the substrate along the first region, disposing the one or more conductors over the first region.

4. The method of claim 1, wherein the step of folding the flexible substrate comprises folding the substrate by at least 45 degrees.

5. The method of claim 1, wherein the method further comprises the steps of:

disposing one or more conductors over at least a portion of a second region of the first surface of the flexible substrate; and

folding the flexible substrate along the second region, wherein the fold along the second region crosses the one or more conductors.

6. The method of claim 5, wherein the fold along the first region is disposed substantially perpendicular to the fold along the second region.

7. The method of claim 5, wherein the fold along the first region is disposed substantially parallel to the fold along the second region.

8. The method of claim 5, wherein the fold along the first region is disposed closer to the device footprint than the fold along the second region.

9. The method in claim 1, wherein the step of folding the flexible substrate creates a first edge along the first region of the flexible substrate.

10. The method of claim 9, wherein the device footprint is disposed within 5.0 mm of the first edge.

11. The method of claim 9,

wherein the device footprint comprises an active area and an inactive device area, and

wherein the active device area is disposed within 5.0 mm of the first edge.

12. The method of claim 9, wherein the device footprint is disposed within 1.0 mm of the first edge.

13. The method of claim 1, wherein the step of disposing the one or more conductors comprises:

depositing a conductive layer over the first surface of the flexible substrate; and

patterning the conductive layer to form a plurality of conductors.

14. The method of claim 1, wherein the step of disposing the one or more conductors comprises at least one step for:

direct printing a conductive material over the first surface of the flexible substrate to form the one or more conductors;

depositing a conductive layer to form the one or more conductors using a vacuum process; and

dipping the first surface of the substrate into a conductive material so as to form the one or more conductors.

15. The method of claim 1,

wherein the flexible substrate has a third edge and a fourth edge;

and

wherein the first region extends from the third edge to the fourth edge.

16. A product, comprising:

a first substrate having a first surface and a second surface, wherein the first surface comprises a first region;

a flexible Organic Light Emitting Device (OLED) having a device footprint disposed over the first surface of the first substrate;

one or more conductors disposed over the first surface of the first substrate, wherein the one or more conductors are disposed across the first region of the first substrate; and

a continuous barrier layer disposed over the first surface of the first substrate, wherein the first substrate is folded along the first region and the fold crosses the one or more conductors.

17. The product of claim 16,

wherein the first surface comprises a second region, wherein the first substrate is folded along the second region;

and

wherein the one or more conductors are disposed across the second region of the first substrate.

18. The product of claim 16, wherein the product comprises a display and wherein the display comprises

an OLED display.

19. The product of claim 16, further comprising:

a second substrate having a third surface and a fourth surface, wherein the third surface comprises a third region, wherein the second substrate is folded along the third region;

a device having a device footprint disposed over the third surface of the second substrate; and

one or more conductors disposed over the third surface of the second substrate, wherein the one or more conductors are disposed across the third region of the second substrate;

wherein the one or more conductors disposed over the first surface of the first substrate are electrically coupled to the one or more conductors disposed over the third surface of the second substrate.

20. The product of claim 19, further comprising:

a plurality of substrates disposed adjacent to the first substrate, wherein each of the plurality of substrates comprises a first surface and a second surface, wherein the first surface comprises a first region, and wherein each of the plurality of substrate is folded along the first region;

a plurality of devices each having a device footprint disposed over the first surface of each of the plurality of substrates; and

one or more conductors disposed over the first surface of each of the plurality of substrates, wherein the one or more conductors disposed over the first surface of each of the plurality of substrates are disposed across the first region of each of the substrates.