Display device and electronic device

• US 10,042,174 B2
• Filed: 05/02/2013
• Issued: 08/07/2018
• Est. Priority Date: 05/09/2012
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Hirakata, Yoshiharu
• Primary Examiner(s): Tung, Kee M
• Assistant Examiner(s): Li, Grace Q
• Application Number:
  US13/875,588
• Publication Number:
  US 20130301124A1
• Time in Patent Office: 1,923 Days
• CPC Class Codes: G02B 30/00 Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images in microscopes G02B21/22
• CPC Class Codes: G02B 30/27 involving lenticular arrays
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
• CPC Class Codes: H04N 13/144 for flicker reduction
• CPC Class Codes: H04N 13/302 for viewing without the aid of special glasses, i.e. using autostereoscopic displays
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/30 Devices specially adapted for multicolour light emission
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/878 comprising reflective means

Abstract

A display device has an NTSC ratio of higher than or equal to 80% and a contrast ratio of higher than or equal to 500 and includes a display portion. In the display portion, a pixel is provided at a resolution of greater than or equal to 80 ppi, and the pixel includes a light-emitting module capable of emitting light with a spectral line half-width of less than or equal to 60 nm. Further, the light emission of the light-emitting module is raised to a desired luminance with a gradient of greater than or equal to 0 in response to an input signal within a response time of longer than or equal to 1 μs and shorter than 1 ms.

Claims

1. A display device comprising:

a display portion in which pixels are provided at a resolution of greater than or equal to 80 ppi, wherein a light-emitting module capable of emitting light with a spectral line half-width of less than or equal to 60 nm is in each pixel of the pixels; and

a circuit configured to generate a signal that corrects a response time of light emission of the light-emitting module and to output the signal to the display portion, so that luminance of light emission of the light-emitting module is raised with a gradient of greater than 0 in response to the signal in a response time of longer than or equal to 1 μ

s and shorter than 1 ms,

wherein a light-emitting module of a first pixel of the pixels is capable of emitting light of a first color with a first spectral line half-width of less than or equal to 60 nm, and a light-emitting module of a second pixel of the pixels is capable of emitting light of a second color with a second spectral line half-width of less than or equal to 60 nm, the first spectral line half-width being different from the second spectral line half-width,

wherein the display device has an NTSC ratio of higher than or equal to 80% and a contrast ratio of higher than or equal to 500, and

wherein the signal has a voltage waveform in which the voltage is raised in a stepwise manner.

2. The display device according to claim 1,

wherein the light-emitting module comprises:

a reflective film;

a semi-transmissive and semi-reflective film; and

a light-emitting element between the reflective film and the semi-transmissive and semi-reflective film, the light-emitting element comprising;

a pair of electrodes; and

a layer comprising a light-emitting organic compound between the pair of electrodes.

3. The display device according to claim 1,

wherein the light-emitting module comprises:

a reflective film;

a semi-transmissive and semi-reflective film;

a light-emitting element between the reflective film and the semi-transmissive and semi-reflective film, the light-emitting element comprising;

a pair of electrodes;

a plurality of layers each comprising a light-emitting organic compound between the pair of electrodes; and

an interlayer between one of the plurality of layers and another of the plurality of layers; and

a color filter overlapping with the light-emitting element with the semi-transmissive and semi-reflective film provided therebetween.

4. The display device according to claim 3, comprising:

a first light-emitting module comprising;

a color filter transmitting red light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to i/2 times (i is a natural number) a length greater than or equal to 600 nm and less than 800 nm;

a second light-emitting module comprising;

a color filter transmitting green light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to j/2 times (j is a natural number) a length greater than or equal to 500 nm and less than 600 nm; and

a third light-emitting module comprising;

a color filter transmitting blue light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to k/2 times (k is a natural number) a length greater than or equal to 400 nm and less than 500 nm.

5. The display device according to claim 3, comprising:

a first light-emitting module comprising;

a color filter transmitting red light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to i/2 times (i is a natural number) a length greater than or equal to 600 nm and less than 800 nm;

a second light-emitting module comprising;

a color filter transmitting green light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to j/2 times (j is a natural number) a length greater than or equal to 500 nm and less than 600 nm; and

a third light-emitting module comprising;

a color filter transmitting blue light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to k/2 times (k is a natural number) a length greater than or equal to 400 nm and less than 500 nm,

wherein the first light-emitting module, the second light-emitting module, and the third light-emitting module comprise a layer comprising a same light-emitting organic compound.

6. The display device according to claim 1, comprising:

a first light-emitting module configured to emit red light with a spectral line half-width of less than 50 nm;

a second light-emitting module configured to emit green light with a spectral line half-width of less than the spectral line half-width of the red light; and

a third light-emitting module configured to emit blue light with a spectral line half-width of less than the spectral line half-width of the green light.

7. An electronic device comprising the display device according to claim 1.

8. The display device according to claim 1, wherein the light-emitting module comprises no liquid-crystal element.

9. A display device comprising:

a display portion in which pixels are provided at a resolution of greater than or equal to 80 ppi, wherein a light-emitting module capable of emitting light with a spectral line half-width of less than or equal to 60 nm is in each pixel of the pixels; and

a circuit configured to generate a signal that corrects a response time of luminance of light emission of the light-emitting module and to output the signal to the display portion, so that luminance of light emission of the light-emitting module is raised with a gradient of greater than 0 in response to the signal in a response time of longer than or equal to 1 μ

s and shorter than 1 ms,

wherein a light-emitting module of a first pixel of the pixels is capable of emitting light of a first color with a first spectral line half-width of less than or equal to 60 nm, and a light-emitting module of a second pixel of the pixels is capable of emitting light of a second color with a second spectral line half-width of less than or equal to 60 nm, the first spectral line half-width being different from the second spectral line half-width,

wherein the display device has an NTSC ratio of higher than or equal to 80% and a contrast ratio of higher than or equal to 500,

wherein the signal has a voltage waveform in which the voltage is raised in a stepwise manner, and

wherein the light-emitting module comprises no liquid-crystal element.

10. The display device according to claim 9,

wherein the light-emitting module comprises:

a reflective film;

a semi-transmissive and semi-reflective film; and

a light-emitting element between the reflective film and the semi-transmissive and semi-reflective film, the light-emitting element comprising;

a pair of electrodes; and

a layer comprising a light-emitting organic compound between the pair of electrodes.

11. The display device according to claim 9,

wherein the light-emitting module comprises:

a reflective film;

a semi-transmissive and semi-reflective film;

a light-emitting element between the reflective film and the semi-transmissive and semi-reflective film, the light-emitting element comprising;

a pair of electrodes;

a plurality of layers each comprising a light-emitting organic compound between the pair of electrodes; and

an interlayer between one of the plurality of layers and another of the plurality of layers; and

a color filter overlapping with the light-emitting element with the semi-transmissive and semi-reflective film provided therebetween.

12. The display device according to claim 11, comprising:

a first light-emitting module comprising;

a color filter transmitting red light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to i/2 times (i is a natural number) a length greater than or equal to 600 nm and less than 800 nm;

a second light-emitting module comprising;

a color filter transmitting green light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to j/2 times (j is a natural number) a length greater than or equal to 500 nm and less than 600 nm; and

a third light-emitting module comprising;

a color filter transmitting blue light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to k/2 times (k is a natural number) a length greater than or equal to 400 nm and less than 500 nm.

13. The display device according to claim 11, comprising:

a first light-emitting module comprising;

a color filter transmitting red light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to i/2 times (i is a natural number) a length greater than or equal to 600 nm and less than 800 nm;

a second light-emitting module comprising;

a color filter transmitting green light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to j/2 times (j is a natural number) a length greater than or equal to 500 nm and less than 600 nm; and

a third light-emitting module comprising;

a color filter transmitting blue light; and

the reflective film and the semi-transmissive and semi-reflective film between which an optical path length is adjusted to k/2 times (k is a natural number) a length greater than or equal to 400 nm and less than 500 nm, and

wherein the first light-emitting module, the second light-emitting module, the third light-emitting module comprise a layer comprising a same light-emitting organic compound.

14. The display device according to claim 9, comprising:

a first light-emitting module configured to emit red light with a spectral line half-width of less than 50 nm;

a second light-emitting module configured to emit green light with a spectral line half-width of less than the spectral line half-width of the red light; and

a third light-emitting module configured to emit blue light with a spectral line half-width of less than the spectral line half-width of the green light.

15. An electronic device comprising the display device according to claim 9.

16. A display device comprising:

a display portion in which pixels are provided at a resolution of greater than or equal to 80 ppi, wherein a light-emitting module capable of emitting light with a spectral line half-width of less than or equal to 60 nm is in each pixel of the pixels; and

a circuit configured to generate a signal that corrects a response time of light emission of the light-emitting module and to output the signal to the display portion, so that luminance of light emission of the light-emitting module is raised with a gradient of greater than 0 in response to the signal in a response time of longer than or equal to 1 μ

s and shorter than 1 ms,

wherein the display device has an NTSC ratio of higher than or equal to 80% and a contrast ratio of higher than or equal to 500, and

wherein the signal has a voltage waveform in which the voltage is raised in a stepwise manner.

17. The display device according to claim 16, wherein the light-emitting module comprising:

a pair of electrodes; and

a layer comprising a light-emitting organic compound between the pair of electrodes.

18. The display device according to claim 17, wherein the light-emitting organic compound is one of a fluorescent organic compound and a phosphorescent organic compound.

19. An electronic device comprising the display device according to claim 16.

20. The display device according to claim 16, wherein the light-emitting module comprises no liquid-crystal element.