Display device and folding portable terminal

• US 7,532,173 B2
• Filed: 02/27/2004
• Issued: 05/12/2009
• Est. Priority Date: 02/28/2003
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Tsuchiya, Kaoru, Arai, Yasuyuki, Godo, Hiromichi, Sakata, Junichiro, Watanabe, Yasuko, Anzai, Aya, Yamazaki, Shunpei
• Primary Examiner(s): Abdulselam; Abbas I
• Application Number:
  US10/788,255
• Publication Number:
  US 20050024339A1
• Time in Patent Office: 1,901 Days
• Field of Search: 345/1.1, 345/32, 345/33, 345/34, 345/44, 345/55, 455/566, 348/52, 359/465, 257/88, 257/98
• US Class Current: 345/1.1
• CPC Class Codes: G06F 1/1616 with folding flat displays, e.g. laptop computers or notebooks having a clamshell configuration, with body parts pivoting to an open position around an axis parallel to the plane they define in closed position
• CPC Class Codes: G06F 1/1637 Details related to the display arrangement, including those related to the mounting of the display in the housing
• CPC Class Codes: G06F 1/1647 including at least an additional display G06F1/1692 takes precedence
• CPC Class Codes: G06F 1/1677 for detecting open or closed state or particular intermediate positions assumed by movable parts of the enclosure, e.g. detection of display lid position with respect to main body in a laptop, detection of opening of the cover of battery compartment
• CPC Class Codes: G06F 1/1686 the I/O peripheral being an integrated camera
• CPC Class Codes: G06F 2200/1614 Image rotation following screen orientation, e.g. switching from landscape to portrait mode
• CPC Class Codes: G06F 3/1423 controlling a plurality of local displays, e.g. CRT and flat panel display
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2340/0492 Change of orientation of the displayed image, e.g. upside-down, mirrored
• CPC Class Codes: H04M 1/0214 Foldable telephones, i.e. with body parts pivoting to an open position around an axis parallel to the plane they define in closed position combined with translation movement H04M1/0235
• CPC Class Codes: H04M 1/0245 using open/close detection
• CPC Class Codes: H04M 1/724 User interfaces specially adapted for cordless or mobile telephones
• CPC Class Codes: H04M 2250/16 including more than one display unit
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 2102/351 Thickness
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/128 comprising two independent displays, e.g. for emitting information from two major sides of the display
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: H10K 59/65 OLEDs integrated with inorganic image sensors

Abstract

It is an object to provide a highly functioned and highly value-added display device and mobile terminal. It is another object to provide a display device and mobile terminal characterized by including a plurality of pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency, a second display screen over the opposite surface of the one surface of the substrate, each of the plurality of pixels having a light emitting element for emitting light toward the first display screen and the second display screen, and a first polarizer over one surface of the substrate and a second polarizer over the opposite surface of the one surface of the substrate.

Claims

1. A display device comprising:

a plurality of pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency;

a second display screen over an opposite surface of the substrate that is opposite to the one surface of the substrate, each of the plurality of pixels having a light emitting element for emitting light toward the first display screen and the second display screen, wherein the light emitting element comprises a first electrode and a second electrode both having a translucency, and a light-emitting layer interposed therebetween; and

a first polarizer over the one surface of the substrate and a second polarizer over the opposite surface of the one surface of the substrate.

2. A display device according to claim 1, wherein an angle formed by the first polarizer and the second polarizer is from 40°

to 90°

.

3. A display device comprising:

a plurality of pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency;

a second display screen over an opposite surface of the substrate that is opposite to the one surface of the substrate, each of the plurality of pixels having a light emitting element for emitting light toward the first display screen and the second display screen, wherein the light emitting element comprises a first electrode and a second electrode both having a translucency, and a light-emitting layer interposed therebetween;

one or both of a first ½

wave plate and a first ¼

wave plate and a first polarizer over the one surface of the substrate; and

one or both of a second ½

wave plate and a second ¼

wave plate and a second polarizer over the opposite surface of the substrate.

4. A display device according to claim 3, wherein an angle formed by the first polarizer and the second polarizer is from 40°

to 90°

.

5. A folding portable terminal comprising:

a first housing having a double-sided display panel and a second housing having operation buttons, the first housing and the second housing being connected through a hinge;

the double-sided display panel having plurality of pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency and a second display screen over an opposite surface of the substrate that is opposite to the one surface of the substrate; and

each of the plurality of pixels having a light emitting element which emits light toward the first display screen and the second display screen, wherein the light emitting element comprises a first electrode and a second electrode both having a translucency, and a light-emitting layer interposed therebetween.

6. A folding portable terminal according to claim 5, wherein each of the plurality of pixels has a plurality of transistors controlling the light emitting elements.

7. A folding portable terminal according to claim 5, wherein the first housing includes a microphone and a second housing includes a speaker.

8. A folding portable terminal according to claim 5, wherein the light-emitting layer includes organic compounds emitting red, green and blue light, and

wherein one or more factors selected from transmittances, absorption coefficients and reflectivities of light through the first electrode and light through the second electrode are identical with each other.

9. A folding portable terminal comprising:

a first housing having a double-sided display panel and a second housing having operation buttons, the first housing and the second housing being connected through a hinge;

the double-sided display panel having a plurality of pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency and a second display screen over an opposite surface of the substrate that is opposite to the one surface of the substrate;

each of the plurality of pixels having a light emitting element which emits light toward the first display screen and the second display screen, wherein the light emitting element comprises a first electrode and a second electrode both having a translucency, and a light-emitting layer interposed therebetween; and

a first polarizer over the one surface of the substrate and a second polarizer over the opposite surface of the substrate.

10. A folding portable terminal according to claim 9, wherein an angle formed by the first polarizer and the second polarizer is from 40°

to 90°

.

11. A folding portable terminal according to claim 9, wherein each of the plurality of pixels has a plurality of transistors controlling the light emitting elements.

12. A folding portable terminal according to claim 9, wherein the first housing includes a microphone and a second housing includes a speaker.

13. A folding portable terminal according to claim 9, wherein the light-emitting layer includes organic compounds emitting red, green and blue light, and

wherein one or more factors selected from transmittances, absorption coefficients and reflectivities of light through the first electrode and light through the second electrode are identical with each other.

14. A folding portable terminal comprising:

a first housing having a double-sided display panel and a second housing having operation buttons, the first housing and the second housing being connected through a hinge;

the double-sided display panel having a plurality of pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency and a second display screen over an opposite surface of the substrate that is opposite to the one surface of the substrate;

each of the plurality of pixels having a light emitting element which emits light toward the first display screen and the second display screen, wherein the light emitting element comprises a first electrode and a second electrode both having a translucency, and a light-emitting layer interposed therebetween;

one or both of a first ½

wave plate and a first ¼

wave plate and a first polarizer over the one surface of the substrate; and

one or both of a second ½

wave plate and a second ¼

wave plate and a second polarizer over the opposite surface of the substrate.

15. A folding portable terminal according to claim 14, wherein an angle formed by the first polarizer and the second polarizer is from 40°

to 90°

.

16. A folding portable terminal according to claim 14, wherein each of the plurality of pixels has a plurality of transistors controlling the light emitting elements.

17. A folding portable terminal according to claim 14, wherein the first housing includes a microphone and a second housing includes a speaker.

18. A folding portable terminal according to claim 14, wherein the light-emitting layer includes organic compounds emitting red, green and blue light, and

wherein one or more factors selected from transmittances, absorption coefficients and reflectivities of light through the first electrode and light through the second electrode are identical with each other.

19. A folding portable terminal comprising:

a first housing having a double-sided display panel and a second housing having operation buttons, the first housing and the second housing being connected through a hinge;

the double-sided display panel having a plurality of pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency and a second display screen over an opposite surface of the substrate that is opposite to the one surface of the substrate; and

each of the plurality of pixels having a light emitting element emitting light toward the first display screen and the second display screen and an optoelectronic transducer, wherein the light emitting element comprises a first electrode and a second electrode both having a translucency, and a light-emitting layer interposed therebetween.

20. A folding portable terminal according to claim 19, wherein each of the plurality of pixels has a plurality of transistors controlling the light emitting elements.

21. A folding portable terminal according to claim 19, wherein the first housing includes a microphone and a second housing includes a speaker.

22. A folding portable terminal according to claim 19, wherein the light-emitting layer includes organic compounds emitting red, green and blue light, and

wherein one or more factors selected from transmittances, absorption coefficients and reflectivities of light through the first electrode and light through the second electrode are identical with each other.

23. A folding portable terminal comprising:

a first housing having a double-sided display panel and a second housing having operation buttons, the first housing and the second housing being connected through a hinge;

the double-sided display panel having a plurality of first pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency and a plurality of second pixels arranged in a matrix form and a second display screen over an opposite surface of the substrate that is opposite to the one surface of the substrate; and

each of the plurality of first and second pixels having a light emitting element emitting light toward the first display screen and the second display screen, wherein the light emitting element comprises a first electrode and a second electrode both having a translucency, and a light-emitting layer interposed therebetween.

24. A folding portable terminal according to claim 23, wherein each of the plurality of pixels has a plurality of transistors controlling the light emitting elements.

25. A folding portable terminal according to claim 23, wherein the first housing includes a microphone and a second housing includes a speaker.

26. A folding portable terminal according to claim 23, wherein the light-emitting layer includes organic compounds emitting red, green and blue light, and

wherein one or more factors selected from transmittances, absorption coefficients and reflectivities of light through the first electrode and light through the second electrode are identical with each other.

27. A folding portable terminal comprising:

a first housing having a plurality of double-sided display panels and a second housing having operation buttons, the first housing and the second housing being connected through a hinge;

each of the plurality of double-sided display panels having plurality of pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency and a second display screen over an opposite surface of the substrate that is opposite to the one surface of the substrate; and

each of the plurality of pixels having a light emitting element emitting light toward the first display screen and the second display screen, wherein the light emitting element comprises a first electrode and a second electrode both having a translucency, and a light-emitting layer interposed therebetween.

28. A folding portable terminal according to claim 27, wherein each of the plurality of pixels has a plurality of transistors controlling the light emitting elements.

29. A folding portable terminal according to claim 27, wherein the first housing includes a microphone and a second housing includes a speaker.

30. A folding portable terminal according to claim 27, wherein the light-emitting layer includes organic compounds emitting red, green and blue light, and

wherein one or more factors selected from transmittances, absorption coefficients and reflectivities of light through the first electrode and light through the second electrode are identical with each other.

31. A folding portable terminal comprising:

a first housing having first to third double-sided display panels and a second housing having operation buttons, the first housing and the second housing being connected through a hinge;

each of the first to third double-sided display panels having a plurality of pixels arranged in a matrix form and a first display screen over one surface of a substrate having a translucency and a second display screen over an opposite surface of the substrate that is opposite to the one surface of the substrate;

each of the plurality of pixels having a light emitting element emitting light toward the first display screen and the second display screen; and

the first double-sided display panel having a red display element, the second double-sided display panel having a green display element, and the third double-sided display panel having a blue display element.

32. A folding portable terminal according to claim 31, wherein each of the plurality of pixels has a plurality of transistors controlling the light emitting elements.

33. A folding portable terminal according to claim 31, wherein the first housing includes a microphone and a second housing includes a speaker.

34. A folding portable terminal according to claim 31, wherein the light emitting element has a first electrode having a translucency, a layer including organic compounds emitting red, green and blue light in contact with the first electrode, and a second electrode having a translucency in contact with the layer including the organic compounds, and

wherein one or more factors selected from transmittances, absorption coefficients and reflectivities of light through the first electrode and light through the second electrode are identical with each other.