Flexible display designed for minimal mechanical strain

• US 20060132025A1
• Filed: 12/22/2004
• Published: 06/22/2006
• Est. Priority Date: 12/22/2004
• Status: Abandoned Application

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Gao, Zhanjun, Ebrahim, Tabrez Y., Wien, Richard W.
• Application Number:
  US11/020,910
• Publication Number:
  US 20060132025A1
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/80 Constructional details
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements

Abstract

The invention relates to a balanced optical display comprising a flexible substrate, an electrical optical display element comprising at least one conductive layer adjacent to the display element wherein at least one of the conductive layers has an elongation to break of less than 2 percent, and a balancing layer on the side opposite to the substrate, wherein the thickness and Young'"'"'s modulus of each layers of the display is selected in such a way so that the display capable of being formed to a radius of curvature of 10 cm without damage.

Claims

1. A balanced optical display comprising a flexible substrate, an electrical optical display element comprising at least one conductive layer adjacent to the display element wherein at least one of the conductive layers has an elongation to break of less than 2 percent, and a balancing layer on the side opposite to the substrate, wherein the thickness and Young'"'"'s modulus of each layers of the display is selected in such a way so that the display capable of being formed to a radius of curvature of 10 cm without damage.

2. The balanced optical display of claim 1 wherein the thickness and Young'"'"'s modulus of each layers of the display is selected in such a way so that the elongation of the said at least one conductive layer is minimized.

3. The balanced optical display of claim 1 wherein the thickness and Young'"'"'s modulus of each layers of the display is selected in such a way so that the elongation of the said at least one conductive layer is substantially zero.

4. The balanced optical display of claim 1 wherein said balanced display is capable of being formed to a radius of curvature of 5mm without damage.

5. The balanced optical display of claim 1 wherein said flexible substrate has a Young'"'"'s modulus between 1 GPa to 8 Gpa.

6. The balanced optical display of claim 1 wherein the electrical optical display element comprises a liquid crystal display.

7. The balanced optical display of claim 1 wherein the electrical optical display element comprises an organic light emitting diode display.

8. The balanced optical display of claim 1 wherein said substrate has a thickness of between 1 mm and 20 mm.

9. The balanced optical display of claim 1 wherein said balancing layer has a thickness of between 1 mm and 20 mm.

10. The balanced optical display of claim 1 wherein said display element has a thickness of between 2 and 20 micrometers.

11. The balanced optical display of claim 1 wherein the conductive layers comprise indium tin oxide, indium-zinc oxide (IZO) and tin oxide.

12. The balanced optical display of claim 1 wherein the balancing layer is selected from at least one of a polymer layer, a glass layer, or a metal layer.

13. A balanced optical display comprising a flexible substrate, an electrical optical display element comprising at least one conductive layer adjacent to the display element wherein at least one of the conductive layers has an elongation to break of less than 2 percent, and a balancing layer as the flexible substrate on the side opposite to the substrate, wherein the thickness and Young'"'"'s modulus of each layers of the display is selected in such a way so that Equation (4) is satisfied, wherein the Equation is

$\begin{array}{c}{E}_1\end{array}$

∫

A 1 ⁢

y ⁢

 

⁢

ⅆ

A + E 2 ⁢

∫

A 2 ⁢

y ⁢

 

⁢

ⅆ

A + E 3 ⁢

∫

A 3 ⁢

y ⁢

 

⁢

ⅆ

A = 0. ( 4 )

14. The balanced optical display of claim 13 wherein said balanced display is capable of being formed to a radius of curvature of 5 mm without damage.

15. The balanced optical display of claim 13 wherein said flexible substrate has a Young'"'"'s modulus between 1 GPa to 8 GPa.

16. The balanced optical display of claim 13 wherein the electrical optical display element comprises a liquid crystal display.

17. The balanced optical display of claim 13 wherein the electrical optical display element comprises an organic light emitting diode display.

18. The balanced optical display of claim 13 wherein said substrate has a thickness of between 1 mm and 20 mm.

19. The balanced optical display of claim 13 wherein said balancing layer has a thickness of between 1 mm and 20 mm.

20. The balanced optical display of claim 13 wherein said display element has a thickness of between 2 and 20 micrometers.

21. The balanced optical display of claim 13 wherein the conductive layers comprise indium tin oxide, indium-zinc oxide (IZO) and tin oxide.

22. The balanced optical display of claim 13 wherein the balancing layer is selected from at least one of a polymer layer, a glass layer, or a metal layer.