Display device and telecommunication system

• US 8,884,845 B2
• Filed: 09/29/2004
• Issued: 11/11/2014
• Est. Priority Date: 10/28/2003
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Miyagawa, Keisuke
• Primary Examiner(s): Moorad, Waseem
• Application Number:
  US10/952,163
• Publication Number:
  US 20050088365A1
• Time in Patent Office: 3,695 Days
• Field of Search: 345 7- 8, 345 76- 78, 340/988, 701/209, 701/213
• US Class Current: 345/8
• CPC Class Codes: G01C 21/365 Guidance using head up displays or projectors, e.g. virtual vehicles or arrows projected on the windscreen or on the road itself
• CPC Class Codes: G02B 2027/0112 comprising device for genereting colour display
• CPC Class Codes: G02B 2027/0132 comprising binocular systems
• CPC Class Codes: G02B 2027/014 comprising information/image processing systems
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: H04N 5/7491 of head mounted projectors

Abstract

The invention provides a display device with which a user'"'"'s view is not completely interrupted by an image that is displayed artificially and of which optical system is easy in design. In addition, the invention provides a telecommunication system capable of providing additional visual information by the use of the display device. According to the invention, an image can be displayed while securing a user'"'"'s view by using a light emitting device that can display an image and transmit light as a display device. Specifically, a pair of electrodes included in a light emitting element is formed to transmit light so as to transmit the outside light. By crossing a visual axis of a user and a pixel portion of the light emitting device, both of the outside light and the light emitted from the pixel portion can enter into the eyeballs of a user.

Claims

1. A display device comprising:

a first optical system comprising a first convex lens;

a second optical system comprising a second convex lens and a third convex lens;

a light emitting device including a pixel portion including a plurality of pixels and an associated controller, the plurality of pixels comprising a pixel comprising;

a first transistor;

a second transistor;

a third transistor;

a fourth transistor;

a capacitor; and

a light emitting element,

wherein a first terminal of the first transistor is connected to a first signal line,

wherein a second terminal of the first transistor is connected to a first terminal of the second transistor, a first terminal of the capacitor, and a gate of the third transistor,

wherein a second terminal of the second transistor, a second terminal of the capacitor, and a second terminal of the third transistor are connected to a second signal line in a direction parallel to the first signal line,

wherein a gate of the fourth transistor is connected to a third signal line in the direction parallel to the first signal line,

wherein a first electrode of the light emitting element is connected to a fourth signal line in a direction perpendicular to the first signal line,

wherein a second electrode of the light emitting element is connected to a first terminal of the fourth transistor,

wherein a second terminal of the fourth transistor is connected to a first terminal of the third transistor,

wherein a gate of the first transistor is connected to a fifth signal line in a direction parallel to the fourth signal line,

where a gate of the second transistor is connected to a sixth signal line in the direction parallel to the fourth signal line, and

wherein a ratio of a channel length to a channel width of the fourth transistor is 5 or more; and

a supporting portion configured to permit a user to wear the light emitting device,

wherein the light emitting element includes an electroluminescent layer interposed between the first electrode and the second electrode,

wherein each of the first electrode and the second electrode transmits light,

wherein an outside light is focused on the light emitting device by the third convex lens and the second convex lens,

wherein the supporting portion is configured to fix the light emitting device at a position at which a user'"'"'s visual axis can cross the pixel portion so that the outside light of an outside area, which is incident on a first side of the light emitting device, transmits through the first electrode and the second electrode to a second side of the light emitting device and is transmitted along with information about the outside area, which is provided at the second side of the light emitting device, to be received by the user'"'"'s eyes through the first convex lens while the electroluminescent layer emits light,

wherein the display device is configured to permit the outside area to be viewed by the user through the first electrode and the second electrode,

wherein the associated controller is configured to cause the information about the outside area to be displayed by the light emitting device and to vary the information based on a direction in which the light emitting device faces, and

wherein the light emitting device which displays the information about the outside area is located on the user'"'"'s visual axis when the user'"'"'s visual axis is directed toward the outside area.

7. The display device according to claim 1, wherein the light emitting device is interposed between the first optical system and the second optical system.

12. The display device according to claim 1, wherein the first transistor, the second transistor, the third transistor, and the fourth transistor have a same conductivity type.

15. The display device according to claim 1, wherein a ratio of a channel length to a channel width of the third transistor is 5 or more.

2. A display device comprising:

a light emitting device including a pixel portion including a plurality of pixels and an associated controller, the plurality of pixels comprising a pixel comprising;

a first transistor;

a second transistor;

a third transistor;

a fourth transistor;

a capacitor; and

a light emitting element,

wherein a first terminal of the first transistor is connected to a first signal line,

wherein a second terminal of the first transistor is connected to a first terminal of the second transistor, a first terminal of the capacitor, and a gate of the third transistor,

wherein a second terminal of the second transistor, a second terminal of the capacitor, and a second terminal of the third transistor are connected to a second signal line in a direction parallel to the first signal line,

wherein a gate of the fourth transistor is connected to a third signal line in the direction parallel to the first signal line,

wherein a first electrode of the light emitting element is connected to a fourth signal line in a direction perpendicular to the first signal line,

wherein a second electrode of the light emitting element is connected to a first terminal of the fourth transistor,

wherein a second terminal of the fourth transistor is connected to a first terminal of the third transistor,

wherein a gate of the first transistor is connected to a fifth signal line in a direction parallel to the fourth signal line,

where a gate of the second transistor is connected to a sixth signal line in the direction parallel to the fourth signal line, and

wherein a ratio of a channel length to a channel width of the fourth transistor is 5 or more;

a supporting portion configured to permit a user to wear the light emitting device;

an antenna for transmitting/receiving signals;

a receiver circuit for processing GPS signals that are transmitted from a GPS satellite; and

an arithmetic circuit for calculating positional information by using the GPS signals,

wherein the light emitting element includes an electroluminescent layer interposed between the first electrode and the second electrode,

wherein each of the first electrode and the second electrode transmits light,

wherein the supporting portion is configured to fix the light emitting device at a position at which a user'"'"'s visual axis can cross the pixel portion so that an outside light of an outside area, which is incident on a first side of the light emitting device, transmits through the first electrode and the second electrode to a second side of the light emitting device and is transmitted along with information about the outside area, which is provided at the second side of the light emitting device, to be received by the user'"'"'s eyes while the electroluminescent layer emits light,

wherein the display device is configured to permit the outside area to be viewed by the user through the first electrode and the second electrode,

wherein the associated controller is configured to cause the information about the outside area to be displayed by the light emitting device and to vary the information based on a direction in which the light emitting device faces, and

wherein the light emitting device which displays the information about the outside area is located on the user'"'"'s visual axis when the user'"'"'s visual axis is directed toward the outside area.

4. The display device according to claim 2, wherein the positional information comprises a latitude and a longitude.

5. The display device according to claim 2 further comprising a memory for storing a processed GPS signal and the positional information as data.

8. The display device according to claim 2, further comprising:

a first optical system comprising a first convex lens; and

a second optical system comprising a second convex lens and a third convex lens,

wherein the outside light is focused on the light emitting device through the third convex lens and the second convex lens, and

wherein the outside light is received by the user'"'"'s eyes through the first convex lens while the electroluminescent layer emits light.

10. The display device according to claim 2, wherein the outside light reaches the display device directly, without going through an optical system.

13. The display device according to claim 2, wherein the first transistor, the second transistor, the third transistor, and the fourth transistor have a same conductivity type.

16. The display device according to claim 2, wherein a ratio of a channel length to a channel width of the third transistor is 5 or more.

3. A display device comprising:

a light emitting device including a pixel portion including a plurality of pixels and an associated controller, the plurality of pixels comprising a pixel comprising;

a first transistor;

a second transistor;

a third transistor;

a fourth transistor;

a capacitor; and

a light emitting element,

wherein a first terminal of the first transistor is connected to a first signal line,

wherein a second terminal of the first transistor is connected to a first terminal of the second transistor, a first terminal of the capacitor, and a gate of the third transistor,

wherein a second terminal of the second transistor, a second terminal of the capacitor, and a second terminal of the third transistor are connected to a second signal line in a direction parallel to the first signal line,

wherein a gate of the fourth transistor is connected to a third signal line in the direction parallel to the first signal line,

wherein a first electrode of the light emitting element is connected to a fourth signal line in a direction perpendicular to the first signal line,

wherein a second electrode of the light emitting element is connected to a first terminal of the fourth transistor,

wherein a second terminal of the fourth transistor is connected to a first terminal of the third transistor,

wherein a gate of the first transistor is connected to a fifth signal line in a direction parallel to the fourth signal line,

where a gate of the second transistor is connected to a sixth signal line in the direction parallel to the fourth signal line, and

wherein a ratio of a channel length to a channel width of the fourth transistor is 5 or more; and

a supporting portion configured to permit a user to wear the light emitting device,

wherein the light emitting element includes an electroluminescent layer interposed between the first electrode and the second electrode,

wherein each of the first electrode and the second electrode transmits light,

wherein the supporting portion is configured to fix the light emitting device at a position at which a user'"'"'s visual axis can cross the pixel portion so that an outside light of an outside area, which is incident on a first side of the light emitting device, transmits through the first electrode and the second electrode to a second side of the light emitting device and is transmitted along with information about the outside area, which is provided at the second side of the light emitting device, to be received by the user'"'"'s eyes while the electroluminescent layer emits light, and

wherein the display device is configured to permit the outside area to be viewed by the user through the first electrode and the second electrode.

6. The display device according to claim 3 further comprising a memory for storing a processed GPS signal and a positional information as data.

9. The display device according to claim 3, further comprising:

a first optical system comprising a first convex lens; and

a second optical system comprising a second convex lens and a third convex lens,

wherein the outside light is focused on the light emitting device through the third convex lens and the second convex lens, and

wherein the outside light is received by the user'"'"'s eyes through the first convex lens while the electroluminescent layer emits light.

11. The display device according to claim 3, wherein the outside light reaches the display device directly, without going through an optical system.

14. The display device according to claim 3, wherein the first transistor, the second transistor, the third transistor, and the fourth transistor have a same conductivity type.

17. The display device according to claim 3, wherein a ratio of a channel length to a channel width of the third transistor is 5 or more.