Display system and electrical appliance

• US 9,087,476 B2
• Filed: 05/13/2014
• Issued: 07/21/2015
• Est. Priority Date: 01/17/2000
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Koyama, Jun, Shibata, Noriko
• Primary Examiner(s): FARAGALLA, MICHAEL A
• Application Number:
  US14/275,961
• Publication Number:
  US 20140247256A1
• Time in Patent Office: 434 Days
• Field of Search: 345/76, 345/82, 345/77
• US Class Current: 1/1
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/029 by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/028 Generation of voltages supplied to electrode drivers in a matrix display other than LCD
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 2360/14 Detecting light within display terminals, e.g. using a single or a plurality of photosensors
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/145 the light originating from the display screen
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/30 using electroluminescent panels
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

A display system in which the luminance of light-emitting elements in a light-emitting device is adjusted based on information on an environment. A sensor obtains information on an environment as an electrical signal. A CPU converts, based on comparison data set in advance, the information signal into a correction signal for correcting the luminance of EL elements. Upon receiving this correction signal, a voltage changer applies a predetermined corrected potential to the EL elements. Thus, this display system enables control of the luminance of the EL elements.

Claims

1. An electrical appliance comprising:

a light-emitting device, the light-emitting device comprising;

an insulating film over a first substrate;

an EL element over the insulating film, the EL element comprising;

a first electrode over the insulating film;

an EL layer over the first electrode; and

a second electrode over the EL layer, and

a second substrate over the EL element,

a sensor obtaining an information signal; and

a CPU controlling a luminance of the EL element based on the information signal,

wherein the information signal is any one of an environment information signal and a living-body information signal.

2. The electrical appliance according to claim 1, wherein the insulating film is any one of a silicon oxide film, a silicon nitride film, and a silicon oxynitride film.

3. The electrical appliance according to claim 1, wherein the EL layer comprises a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer.

4. The electrical appliance according to claim 1, further comprising a film over the second electrode.

5. The electrical appliance according to claim 4, wherein the film is a silicon nitride film.

6. The electrical appliance according to claim 1, the sensor and the CPU are formed over the first substrate.

7. An electrical appliance comprising:

a light-emitting device, the light-emitting device comprising;

an insulating film over a first substrate;

an EL element over the insulating film, the EL element comprising;

a first electrode over the insulating film;

an EL layer over the first electrode; and

a second electrode over the EL layer, and

a second substrate over the EL element,

a sensor obtaining an information signal; and

a CPU controlling a luminance of the EL element based on the information signal,

wherein the information signal is an environment information signal, and

wherein the first substrate is a plastic substrate.

8. The electrical appliance according to claim 7, wherein the insulating film is any one of a silicon oxide film, a silicon nitride film, and a silicon oxynitride film.

9. The electrical appliance according to claim 7, wherein the EL layer comprises a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer.

10. The electrical appliance according to claim 7, further comprising a film over the second electrode.

11. The electrical appliance according to claim 10, wherein the film is a silicon nitride film.

12. The electrical appliance according to claim 7, the sensor and the CPU are formed over the first substrate.

13. An electrical appliance comprising:

a first light-emitting device and a second light-emitting device, each of the first light-emitting device and the second light-emitting device comprising;

an insulating film over a first substrate;

an EL element over the insulating film, the EL element comprising;

a first electrode over the insulating film;

an EL layer over the first electrode; and

a second electrode over the EL layer, and

a second substrate over the EL element,

a sensor obtaining an information signal; and

a CPU controlling a luminance of the EL element based on the information signal,

wherein the first light-emitting device forms a first image for right-eye, and

wherein the second light-emitting device forms a second image for left-eye.

14. The electrical appliance according to claim 13, wherein the information signal is a living-body information signal.

15. The electrical appliance according to claim 13, wherein the insulating film is any one of a silicon oxide film, a silicon nitride film, and a silicon oxynitride film.

16. The electrical appliance according to claim 13, wherein the EL layer comprises a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer.

17. The electrical appliance according to claim 13, further comprising a film over the second electrode.

18. The electrical appliance according to claim 17, wherein the film is a silicon nitride film.

19. The electrical appliance according to claim 13, the sensor and the CPU are formed over the first substrate.