Optically excited phosphor display screens having coloring filtering pigments embedded in phosphor mixtures

Patent metadata

Field	Value
Publication number	US-2016146433-A1
Application number	US-201514866692-A
Country	US
Kind code	A1
Filing date	Sep 25, 2015
Priority date	Sep 25, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

Techniques and optically excited light-emitting devices based on phosphors are provided to use phosphor materials which absorb excitation light to emit visible light and include a composite phosphor material including two or more different transition metal compounds that, under optical excitation of the excitation light, emit visible light at spectrally close but different spectral wavelengths or bands that spectrally overlap to produce a desired color.

First claim

What is claimed is:

1 . A display device, comprising:
a display screen comprising a light-emitting layer including different phosphor regions that absorb excitation light to emit visible light of designated colors, respectively, wherein two adjacent phosphor regions emit light of two different colors, each phosphor region includes a phosphor mixture including a light-emitting phosphor material that emits light of a designated color in an emission spectral bandwidth, and one or more color filtering pigments embedded within the light-emitting phosphor material to transmit light of a respective designated color of the phosphor region while absorbing light of colors different from the respective designated color to reduce an output spectral bandwidth of the respective designated color produced by the phosphor region to be narrower than the emission spectral bandwidth, each phosphor mixture being formulated to keep phosphor particles dispersed without clumping; and an optical module operable to produce the excitation light that scans across the display screen and carries optical pulses that carry information of different colors on a colored image to be generated by the emitted visible light of different colors by the display screen.

2 . The device as in claim 1 , wherein:
each phosphor region includes one or more color filtering pigments embedded in the light-emitting phosphor material where each color filtering pigment exhibits a different optical absorption spectral profile within its phosphor region effectuating an optical transmission spectral profile, where each color filtering pigment has a distinct optical absorption spectral profile so that the output color of the emitted light out of the phosphor region is shifted in wavelength from a color of the emitted light by the light-emitting phosphor material without the one or more embedded color filtering pigments.

3 . The device as in claim 2 , wherein:
the light-emitting layer includes blue phosphor regions that emit blue light, and one or more color filtering pigments embedded in the light-emitting phosphor material transmit the blue light while absorbing light of other colors and include Pigment Blue 60 and Pigment Blue 15:4.

4 . The device as in claim 2 , wherein:
the light-emitting layer includes green phosphor regions that emit green light, and two or more color filtering pigments embedded in the light-emitting phosphor material transmit the green light while absorbing light of other colors and include (Sr,Ba,Ca) 2 SiO 4 :Eu; Sr 0.01-1.2 Ca 0.01-1.2 Al 0.8-1.2 Si 0.8-1.2 N 2.0-4.0 :Eu 0.001-0.1 and PG36 Lionol Green 6YKP-N, PG7 Heliogen Green D 8730, PG7 Sunfast Green 7 264-8735, PB15:4+PY128 (e.g., RJA D3410-B15:4+Cromophtal Yellow D 0980 J), PB15:4+PY150 (e.g., RJA D3410-B15:4+RJA D3410 Y150).

5 . The device as in claim 2 , wherein:
the light-emitting layer includes red phosphor regions that emit red light, and two or more color filtering pigments embedded in the light-emitting phosphor material transmit the red light while absorbing light of other colors and include (Ba,Ca,Sr, Eu) 2 Si 5 N 8-2x O X C X (0<x<12); Si 3-6 Al 0.01-3 N 5-8 :Eu 0.001-0.1 and PV19 red shade RJA dispersion, PV55 RJA dispersion, PR254 Irgaphor Red 3612 CF, PR264 Irgazin Rubine L 4030 NA

6 . The device as in claim 1 , wherein:
each phosphor region includes two or more color filtering pigments embedded in the light-emitting phosphor material where different color filtering pigments exhibit different optical transmission spectral profiles for two different colors to effectuate a combined optical transmission spectral profile that is for a respective designated color of the phosphor region and has the output spectral bandwidth narrower than the emission spectral bandwidth of the light-emitting phosphor material.

7 . The device as in claim 6 , wherein:
the light-emitting layer includes green phosphor regions that emit green light, and two or more color filtering pigments embedded in the light-emitting phosphor material in each green phosphor region includes (1) a combination of PB15:4 that transmits blue light and PY128 that transmits yellow light, (2) a combination of PB15:4 that transmits blue light and PY150 that transmits yellow light, or (3) a first color filtering pigment containing PY128 to transmit a yellow light and a second color filtering pigment containing Heliogen Green D 8730, PG36, or Sunfast G7 2648735 to transmit green light.

8 . The device as in claim 6 , wherein:
the light-emitting layer includes blue phosphor regions that emit blue light, and two or more color filtering pigments embedded in the light-emitting phosphor material in each blue phosphor region includes a first color filtering pigment containing PB60 RJA D3410-B60 to transmit a blue light and a second color filtering pigment containing PB15:6 RJA D3410C-15:6 to transmit blue light.

9 . The device as in claim 6 , wherein:
the light-emitting layer includes red phosphor regions that emit red light, and two or more color filtering pigments embedded in the light-emitting phosphor material in each red phosphor region includes a first color filtering pigment containing PV55 RJA dispersion to transmit a red light and a second color filtering pigment containing PV19 red shade RJA dispersion to transmit red light.

10 . The device as in claim 1 , wherein the one or more color filtering pigments embedded in the light-emitting phosphor material in a phosphor region that emits red light include PV19, PV55, PR254 or PR264.

11 . The device as in claim 1 , wherein the one or more color filtering pigments embedded in the light-emitting phosphor material in a phosphor region that emits red light include a quinacridone or diketopyrrolopyrrole.

12 . The device as in claim 1 , wherein the one or more color filtering pigments embedded in the light-emitting phosphor material in a phosphor region that emits green light include PG36, PG7, a combination of PB15:4 and PY128, or a combination of PB15:4 and PY150.

13 . The device as in claim 1 , wherein the one or more color filtering pigments embedded in the light-emitting phosphor material in a phosphor region that emits green light include copper bromochlorophthalocyanine, a copper perchlororphthalocyanine, a combination of copper phthalocyanine and an azo (e.g., CAS Registry #79953-85-8), or a combination of copper phthalocyanine and a nickel azomethine.

14 . The device as in claim 1 , wherein the one or more color filtering pigments embedded in the light-emitting phosphor material in a phosphor region that emits blue light include PB60 or PB15:6.

15 . The device as in claim 1 , wherein the one or more color filtering pigments embedded in the light-emitting phosphor material in a phosphor region that emits blue light include indanthrone or copper phthalocyanine.

16 . The device as in claim 1 , wherein a light-emitting phosphor material that emits blue light in a phosphor region of the display screen includes a blue phosphor Sr 3 MgSi 2 O 8 :Eu.

17 . The device as in claim 16 , wherein the one or more color filtering pigments embedded in the light-emitting phosphor material in a phosphor region that emits blue light include indanthrone or copper phthalocyanine.

18 . The device as in claim 1 , wherein a light-emitting phosphor material that emits green in a phosphor region of the display screen includes a green phosphor including (Sr,Ba,Ca) 2 SiO 4 :Eu and Sr 0.01-1.2 Ca 0.01-1.2 Al 0.8-1.2 Si 0.8-1.2 N 2.0-4.0 :Eu 0.001-0.1 .

19 . The device as in claim 18 , wherei

Assignees

• Prysm Inc

Inventors

• Bukesov Sergey A
• Stuhl Louis S

Classifications

• G02B1/10 Primary

  Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence) · CPC title

• G02B5/201

  in the form of arrays · CPC title

• H04N9/3182

  Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607) · CPC title

• F21V9/16 Primary

  Mechanical Engineering · mapped topic

• H04N9/3141

  Constructional details thereof (details not peculiar to the presence of an electronic spatial light modulator G03B21/14) · CPC title