Chiplet display with electrode connectors

• US 8,599,118 B2
• Filed: 02/16/2011
• Issued: 12/03/2013
• Est. Priority Date: 02/16/2011
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Inventors: Cok, Ronald S.
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): LAM, VINH TANG
• Application Number:
  US13/028,685
• Publication Number:
  US 20120206428A1
• Time in Patent Office: 1,021 Days
• Field of Search: 345205-206, 313503-504, 3151691-1693
• US Class Current: 345/80
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/129 Chiplets
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/179 Interconnections, e.g. wiring lines or terminals

Abstract

A display device comprising a transparent substrate, transparent electrodes, light-emitting layers, and reflective electrodes that define light-emitting pixels in which chiplets with pixel driving circuits are connected to pixel connection pads that are connected to the transparent electrode by an opaque electrode connector such that at least a portion of one opaque electrode connector overlaps at least a portion of a transparent electrode to which the opaque electrode connector is not electrically connected. The device provides a display having improved pixel-driving performance and increased light-emitting area.

Claims

1. A display device, comprising:

a) a transparent substrate having a display area;

b) a plurality of transparent electrodes formed over the transparent substrate in the display area, one or more light-emitting layers formed over the transparent electrodes, one or more reflective electrodes formed over the one or more light-emitting layers, where an overlap between the plurality of transparent electrodes and the one or more reflective electrodes defines a corresponding plurality of light-emitting pixels;

c) one or more chiplets including pixel driving circuits connected to pixel connection pads, each pixel connection pad electrically connected to a transparent electrode by an electrically conductive opaque electrode connector, the pixel driving circuits providing current through the connection pads and the electrically conductive opaque electrode connectors to the transparent electrodes to drive the pixels to emit light; and

d) wherein the electrically conductive opaque electrode connectors are formed over the transparent substrate in the display area and the transparent electrodes are formed over, and separated from, the electrically conductive opaque electrode connectors by a transparent insulator and wherein at least a portion of one electrically conductive opaque electrode connector overlaps at least a portion of a transparent electrode to which the electrically conductive opaque electrode connector is not electrically connected.

2. The display device of claim 1, wherein a chiplet drives more than four pixels.

3. The display device of claim 1, wherein the chiplets are located between the transparent electrodes and the substrate in the display area and wherein the transparent electrodes extend over the substrate in a portion of the same display area as the chiplets.

4. The display device of claim 1, wherein the side of the electrically conductive opaque electrode connectors facing the transparent electrode is reflective.

5. The display device of claim 1, wherein the side of the electrically conductive opaque electrode connectors facing the transparent electrode is light-scattering.

6. The display device of claim 1, wherein the side of the electrically conductive opaque electrode connectors opposite the transparent electrode is light absorptive.

7. The display device of claim 1, wherein the connection pads are located in one or more rows along a long axis of the chiplet.

8. The display device of claim 7, wherein the extent of the connection pads in the direction of the long axis is less than the extent of the pixels to which the chiplet is connected in the axis direction.

9. The display device of claim 1, wherein the transparent electrodes are column electrodes formed in columns in a column direction and the reflective electrode includes a plurality of row electrodes formed in rows in a row direction different from the column direction, and the pixels are defined by the overlap of the column electrodes and the row electrodes.

10. The display device of claim 9, wherein at least one chiplet is located under or adjacent to a first column electrode connected to a first connection pad on the at least one chiplet by a first electrically conductive opaque electrode connector and a second electrically conductive opaque electrode is connected to a second connection pad on the at least one chiplet and to a second column electrode different from the first column electrode.

11. The display device of claim 10, wherein the second electrically conductive opaque electrode connector passes under the first column electrode.

12. The display device of claim 11, wherein the second electrically conductive opaque electrode connector passes under the first column electrode and under a first row electrode and under at least a portion of a second row electrode adjacent to the first row electrode.

13. The display device of claim 12, wherein the second electrically conductive opaque electrode connector is connected to the second column electrode under the second row electrode.

14. The display device of claim 10, further comprising a third electrically conductive opaque electrode connected to a third connection pad on the at least one chiplet and to a third column electrode different from the first and second column electrodes.

15. The display device of claim 14, wherein the third opaque electrically conductive electrode connector passes under the first column electrode and under the second column electrode.

16. The display device of claim 15, wherein the third opaque electrically conductive electrode connector passes under a first row electrode and under a second row electrode adjacent to the first row electrode.

17. The display device of claim 1, wherein at least two transparent electrodes have different areas.

18. The display device of claim 9, wherein at least two row or two column electrodes have different areas.

19. The display device of claim 9, wherein at least one pixel has an area different from any of the other pixels that are obscured by the opaque electrodes and located in the same row or wherein at least one pixel has an area different from any of the other pixels that are obscured by the opaque electrodes and located in the same column.

20. The display device of claim 19, wherein either the lifetime or luminance of the at least one pixel and the pixels obscured by the opaque electrodes are equivalent.