Array of thermally conductive elements in an oled display

• US 6,777,870 B2
• Filed: 06/29/2001
• Issued: 08/17/2004
• Est. Priority Date: 06/29/2001
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Sundahl, Robert C.
• Primary Examiner(s): Patel, Nimeshkumar D.
• Assistant Examiner(s): HARPER, HOLLY R
• Application Number:
  US09/897,738
• Publication Number:
  US 20030001488A1
• Time in Patent Office: 1,145 Days
• Field of Search: 313/504, 313/498, 438/99, 445/24
• US Class Current: 313/504
• CPC Class Codes: H10K 50/87 Arrangements for heating or cooling
• CPC Class Codes: H10K 59/17 Passive-matrix OLED displays
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/8794 Arrangements for heating and cooling

Abstract

An organic light emitting diode (OLED) display includes an array of OLED pixels that generate heat and an array of thermally conductive elements positioned between the OLED pixels and a thermally conductive back panel. In one embodiment of the invention, the thermally conductive elements may be solder joints deposited over cathode contacts and anode contacts at each OLED pixel. The solder joints provide a path of low thermal resistance from the OLED pixels to the back panel. Also, the solder joints may serve as an array of electrical connections from back panel interconnects to the cathode lines and anode lines.

Claims

1. An OLED display, comprising;

a back panel having at least one electrical interconnection line;

a front panel substantially parallel to the back panel;

an array of OLED pixels positioned between the front panel and the back panel, the array of OLED pixels having at least one centrally located OLED pixel that is formed at a non-edge location of the array, wherein the centrally located pixel has an anode contact located at the non-edge location; and

a thermally conductive element on the anode contact at the non-edge location to electrically connect the anode contact and the electrical interconnection line of the back panel.

2. The display of claim 1, wherein the central pixel has a cathode contact located at the non-edge location, and a second thermally conductive element is formed on the cathode contact to electrically connect the cathode contact to the electrical connection line of the back panel.

3. The display of claim 1, wherein each OLED pixel comprises a plurality of OLED sub-pixel regions that emit different colors of light.

4. The display of claim 1, wherein the thermally conductive elements comprise solder.

5. The display of claim 1, wherein the back panel comprises a ceramic material.

6. The display of claim 1, further comprising an epoxy material to affix the front panel to the back panel.

7. The display of claim 1, further comprising a heat dissipating structure coupled to a surface of the back panel opposite to the front panel.

8. The display of claim 7, wherein the heat dissipating structure is a heat fin coupled to the surface of the back panel opposite to the front panel.

9. The display of claim 8, further comprising a cooling fan to force airflow over the heat fin.

10. The display of claim 1, wherein the centrally located pixel generates heat when electrical current is conducted though the pixel.

11. The display of claim 10, wherein at least a portion of the heat generated by the centrally located pixel is dissipated to the back panel through at least one thermally conductive element in proximity to the pixel.

12. An OLED display, comprising:

a back panel having at least one electrical interconnection line formed thereon;

a front panel substantially parallel to the back panel; and

an array of OLED pixels positioned between the front panel and the back panel, wherein each OLED pixel is operable to emit light when an electrical current is conducted though the OLED pixel between an anode line and a cathode line,

wherein each cathode line is electrically connected to a corresponding electrical interconnection line of the back panel by thermally conductive elements formed at each OLED pixel and positioned between the cathode line and the corresponding electrical interconnection line;

wherein each anode line is electrically connected to at least one electrical interconnection line of the back panel by thermally conductive elements formed at each OLED pixel and positioned between the anode line and the electrical interconnection line of the back panel.

13. The display of claim 12, wherein each OLED pixel comprises a plurality of OLED sub-pixel regions that emit different colors of light.

14. The display of claim 12, wherein the back panel comprises a ceramic material.

15. The display of claim 12, further comprising an epoxy material to affix the front panel to the back panel such that the epoxy material occupies the space between the thermally conductive elements.

16. The display of claim 12, wherein the thermally conductive elements comprise solder.

17. The display of claim 16, wherein each OLED pixel has:

at least one cathode contact formed between the cathode line and the electrical interconnection line of the back panel; and

a solder joint for each OLED pixel on the cathode contact between the OLED pixel and the back panel.

18. The display of claim 12, wherein each OLED pixel generates heat when electrical current is conducted though the OLED pixel.

19. The display of claim 18, wherein at least a portion of the heat generated by each OLED pixel is dissipated to the back panel through at least one thermally conductive element in proximity to the OLED pixel.

20. The display of claim 12, further comprising a heat dissipating structure coupled to a surface of the back panel opposite to the front panel.

21. The display of claim 20, wherein the heat dissipating structure is a heat fin coupled to the surface of the back panel opposite to the front panel.

22. The display of claim 21, further comprising a cooling fan to force airflow over the heat fin.