GB2093269A - Color Cathode Ray Tube - Google Patents
Color Cathode Ray Tube Download PDFInfo
- Publication number
- GB2093269A GB2093269A GB8202538A GB8202538A GB2093269A GB 2093269 A GB2093269 A GB 2093269A GB 8202538 A GB8202538 A GB 8202538A GB 8202538 A GB8202538 A GB 8202538A GB 2093269 A GB2093269 A GB 2093269A
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- Prior art keywords
- phosphor
- red
- y2o2s
- content
- emission
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/20—Luminescent screens characterised by the luminescent material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/185—Luminescent screens measures against halo-phenomena
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/24—Supports for luminescent material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
- H01J9/22—Applying luminescent coatings
- H01J9/227—Applying luminescent coatings with luminescent material discontinuously arranged, e.g. in dots or lines
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Luminescent Compositions (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
A color cathode ray tube comprises a face plate glass containing neodymium oxide component at a content for effective optical effect corresponding to 0.3 to 1.5 wt.% of neodymium oxide in a glass having a thickness of 10 mm; and a phosphor screen made of plural color phosphors formed on an inner surface of said face plate glass comprises: (a) an europium activated yttrium oxysulfide phosphor (Y2O2S:Eu) having Eu component at a content of 0.04 to 0.08 g.-atom to 1 mole of Y2O2S as a red phosphor or; (b) an europium-activated yttrium oxysulfide phosphor (Y2O2S Eu) having Eu component at a content of 0.025 to 0.07 g.-atom at 1 mole of Y2O2S as a red phosphor which is coated with red oxide red colorant particles in an amount of 0.05 to 0.5 wt.% based on said phosphor. The arrangements provide improved red emission with a deeper tone of red while minimizing the expensive Eu component of the phosphor.
Description
SPECIFICATION
Color Cathode Ray Tube
Background of the Invention
Field of the Invention
The present invention relates to a color cathode ray tube having a phosphor screen.
Description of the Prior Art
A phosphor screen of a conventional color cathode ray tube will be illustrated referring to
Figures 1 and 2. Figure 1 is a sectional model of the phosphor screen of the color cathode ray tube wherein the reference numeral (1 ) designates a face plate glass and three color phosphor dots (3) of red (R), green (G) and blue (B) are formed on the inner surface of the face plate glass.
Figure 2 shows the spectral transmittance curve of the face plate glass (1) and the emission spectra of the three color phosphors of red (R), green (G) and blue (B).
In Figure 2, the curve (a) designates one example of the spectral transmittance curve of the glass used as a clear glass for the face plate glass (1) of the color cathode ray tube and the spectral transmittance curve is substantiallySlat in all visible wavelength region. On the other hand, the curves (b), (c), (d) respectively show emission spectra of the three color phosphors of blue (B), green (G) and red (R). Since the spectral transmittance distribution of the face plate glass (1) is substantially flat in the emission spectral region, the light emitted from the three color phosphors to a spectator of the color cathode ray tube through the face plate glass (1) has the spectral distribution similar to the emission spectral distribution of the three color phosphors of blue (B), green (G) and red (R).That is, in accordance with the color cathode ray tube in which a glass having a substantially flat transmittance distribution in visible wavelength region as a clear glass is used as the face plate glass (1), the spectator feels light having tint substantially the same as the tint of the light emission of the phosphors.
On the other hand, the remarkable improvement has been recently attained for a phosphor screen of a color cathode ray tube. It has been seriously required to improve chromaticity of the three colors of blue (B), green (G) and red (R) that is chromaticity to improve light emission chromaticity of the phosphors of blue (B), green (G) and red (R).
Summary of the Invention
It is an object of the present invention to improve red (R) light emission chromaticity among the three colors of blue, green and red light emission on a phosphor screen of a color cathode ray tube.
The foregoing and other objects of the present invention have been attained by providing a color cathode ray tube which comprises a face plate glass containing neodymium oxide component at a content for effective optical effect corresponding to 0.3 to 1.5 wt% of neodymium oxide in a glass having a thickness of 10 mm; and a phosphor screen made of plural color phosphors formed on an inner surface of said face plate glass which comprises an europium-activated yttrium oxysulfide phosphor (Y202S:Eu) having Eu component at a content of 0.04 to 0.08 g.-atom to 1 mole of Y2O2S as a red phosphor.
Brief Description of the Drawings
Figure 1 is a sectional model of a phosphor screen of a color cathode ray tube;
Figure 2 shows spectral transmittance curve of a face plate glass made of clear glass;
Figure 3 shows one example of emission spectral distribution of Y202S:Eu phosphor;
Figure 4 shows the relation of contents of Eu activator in the Y2O2S:Eu phosphor and chromaticity points of emission colors;
Figure 5 shows spectral transmittance curves of face plate glasses made of Nd-containing glass having various contents of Nd203;
Figure 6 show chromaticity points of emission color emitted from various Y2O2S:Eu phosphors and passed through the face plate glass made of
Nd-containing glass;
Figures 7 to 9 show the relations of contents of
Eu activator in the Y202S::Eu phosphor with a colorant and chromaticity points of emission colors;
Figure 10 shows spectral transmittance curves of face plate glasses made of Nd-containing glass having various contents of Nd2O3;
Figures 11-13 show chromaticity points of emission color emitted from various Y2O2S:Eu phosphors with various colorants and passed through the face plate glass made of Nccontaining glass.
Detailed Description of the Preferred
Embodiments
Rare earth phosphors having linear light emission spectrum have been mainly used as a red (R) light emission phosphor on a phosphor screen of a color cathode ray tube in view of emission brightness and chromaticity. Among the red (R) light emission rare earth phosphors, an yttrium oxysulfide phosphor activated by europium (Y2O2S:Eu) has been mainly used because the chromaticity of the emission color can be controlled depending upon a content of Eu in certain degree to provide a selectivity to chromaticity. Therefore, it has been mainly used for a phosphor screen of a color cathode ray tube.
Figure 3 shows one example of light emission spectral distribution of Y2O2S:Eu phosphor which has a main peak at 626 nm and certain small peaks in the shorter wavelength region. In the
Y202S:Eu phosphor, when the content of Eu to an activator for the main component of yttrium oxide-sulfide increases, the ratio of the main peak emission intensity at about 626 nm to those of the small peaks is relatively increased and the color is relatively shifted to the long wavelength side.
Figure 4 is a CIE chromaticity diagram plotting relation of contents of Eu as an activator for Y2O2S :Eu phosphor and emission colors on the phosphor screen of the color cathode ray tube. In
Figure 4, the points (A), (B), (C) and (D) respectively designate chromaticity points of the emission color at the content of Eu of 0.02 g atom, 0.04 g-atom, 0.06 g-atom, and 0.08 gatom to 1 mole of Y2O2S as the main component.
As it is clearly found from the chromaticity points, when the content of Eu as the activator in the Y2C2S:Eu phosphor increases, the x-coordinates of the chromaticity points of the emission color increase and the y-coordinates thereof decreases whereby the emission color becomes deep red color to improve the chromaticity of the emission color.
The chromaticity allowed as the red (R) emission chromaticity on the phosphor screen of the color cathode ray tube has x-value of 0.620 or more y-value of 0.360 or less (range of hatching on the chromaticity diagram) and Eu used in the Y2O2S:Eu phosphor is expensive. Therefore, the content of Eu in the Y2O2S:Eu red (R) emission phosphor is set in about 0.6 g-atom to 1 mole of
Y202S except special color cathode ray tubes.
The inventors have studied to obtain a color cathode ray tube for deeper tone red (R) emission without a substantial increase of the content of Eu in the Y2C2S:Eu phosphor or obtain a color cathode ray tube for the same deep tone red (R) emission with lower content of Eu, the spectral transmittance distribution of the face plate glass (1 ) of the phosphor screen is changed from the flat distribution of the conventional clear glass to give selective absorption and the light emission from the phosphor is partially modified to apply it to a spectator whereby the chromaticity of the red (R) emission is improved. As a result, it has found a desired relation of the transmittance distribution of the face plate glass (1 ) and the emission spectral distribution of the Y2O2S:Eu phosphor i.e.
the content of Eu.
Referring to Figures 5 and 6, the relation will be illustrated in detail.
Figure 5 shows the examples of the spectral transmittance distribution of the face plate glass of the phosphor screen of the cathode ray tube of the present invention as (a) the spectral transmittance curve of the face plate glass made of a clear glass and (d) the emission spectrum distribution of the Y2O2S:Eu red (R) emission phosphor.
Figure 5 (e), (f), (g) respectively show spectral transmittance curves of face plate glasses (1) made of each glass incorporating Nd2O3 at a content of 0.5, 1.0 or 1.5 wt% in a face plate glass made of the clear glass materials having a thickness of 10 mm (hereinafter referring to as
Nd-containing glass). The Nd-containing glass has a main sharp absorption band at 560-61 5 nm and subabsorption bands in a region of 490545 nm.
The spectral transmittance curve of Ndcontaining glass has strong absorption band at the wavelength for the small peaks of the
Y202S:Eu phosphor and has not a substantial absorption at the wavelength for the main peak of the phosphor as shown in Figure 5. Therefore, when the light emitted from the phosphor is passed through the face plate glass (1) made of the Nd-containing glass to the spectator, the emission of the phosphor is modified to give deeper red chromaticity shifting the emission color to long wavelength side the same as that of the increase of the content of Eu in the Y2O2S:Eu phosphor and to improve the chromaticity of the emission color.
Figure 6 is a CIE chromaticity diagram showing variations of the chromaticity given by passing the
light emitted from the Y2O2S:Eu phosphors having various contents of Eu as an activator through the face plate glass (1) made of the Nd-containing glass in comparison with the original chromaticity of the light emitted from the phosphor (points A,
B, C and D).In Figure 6, the references (A,), (B,), (C,), (D,), respectively designate chromaticity points of the emission color in the case of the pass-through of the face plate glass (1) having a thickness of 10 mm and made of Nd-containing glass having a content of Nd2O3 of 0.5 wt%; and (A2), (B2), (C2), (D2) respectively designate chromaticity points of the emission color in the case of a content of Nd2O3 of 1.0 wt%; and (A3), (B3), (C3), (D3) respectively designate chromaticity points of the emission color in the case of a content of Nd2O3 of 1.5 wt%.
As it is clearly found in Figure 6, it required a content of Eu of 0.06 g-atom as the activator to 1 mole of Y2O2S in the Y2O2S:Eu phosphor in order to attain a desired red (R) emission in the case of the face plate glass (1) made of the conventional clear glass, whereas a desired red (R) emission can be given even though a content of Eu is only 0.04 g-atom to 1 mole of Y2O2S in the phosphor in the case of the face plate glass (1) made of the
Nd-containing glass having a content of Nd2O3 of
1.5 wt%. Therefore, the content of Eu which is remarkably expensive can be reduced to contribute to the remarkable reduction of the cost of the color cathode ray tube.
When the Y2O2S:Eu phosphor activated with 0.06 g-atom of Eu per 1 mole of Y2O2S is used in combination with the improved face plate glass, the chromaticity of the red (R) emission of the phosphor screen of the color cathode ray tube can be improved to be deeper without an increase of the content of Eu as the expensive material.
When a content of Eu in the Y2O2S:Eu phosphor is more than 0.08 g-atom to 1 mole of Y2O2S, the brightness of the emission of the phosphor is disadvantageously, remarkably reduced.
On the other hand, with regard to a content of Nd2O3 in the Nd-containing glass, when it is less than 0.3 wt% per 10 mm of a thickness of the face plate glass, the degree of the modification of the transmission light is disadvantageously too small whereas, when it is more than 1.5 wt%, the light transmittance in all of visible wavelength region is reduced to be disadvantageous for brightness characteristics of the color cathode ray tube. Thus, the content of Nd203 in the Ndcontaining glass is preferably in a range of 0.3 to 1.5 wt% especially 0.5 to 1.0 wt% per 10 mm of the thickness of the face plate glass. When the thickness of the glass is remarkably thinner than 10 mm, or thicker than 10 mm, the content of Nd2O3 can be controlled to give an equal optical effect to that of the thickness of 10 mm.
A black matrix type phosphor screen having a photoabsorption layer between the three color phosphors has been usually used to improve the contrast of the phosphor screen. The present invention can be also applied for such phosphor screen.
In accordance with the color cathode ray tube of the present invention, the modification of the emission color of the Y202S:Eu red (R) emission phosphor is attained by Nod203 incorporated in the face plate glass whereby the red (R) emission having the same or more of the chromaticity can be given even though the content of Eu in the Y2O2S;Eu phosphor is remarkably reduced from the case of the use of the face plate glass made of the clear glass and moreover, the deep red (R) chromaticity can be given without an increase of the content of Eu. Therefore, in accordance with the present invention the cost of the color cathode ray tube can be remarkably reduced and the high quality color cathode ray tube having improved basic characteristics can be obtained.
The other embodiment of the present invention will be illustrated. It has been considered to use an Y2O2S:Eu phosphor with a colorant which is prepared by coating red oxide red colorant particles on the Y2O2S:Eu phosphor to reduce an exterior light reflectivity of the phosphor to improve a contrast of the phosphor screen.
In the specification "red oxide" means "iron oxide in red color".
The light emission spectral distribution of the
Y202S:Eu phosphor with a colorant is substantially the same as that of the Y2O2S:Eu phosphor. Certain small peak emission is absorbed by the red oxide colorant particles coated on the Y2O2S:Eu phosphor whereby the emission color is relatively shifted to long wavelength side. When an amount of the colorant is too much, the brightness emitted by the phosphor is remarkably reduced, whereas when it is too small, the exterior light reflectivity of the phosphor is not satisfactorily reduced whereby the improvement of a contrast of the phosphor screen is not enough. Therefore, an amount of the red oxide red colorant is in a range of 0.05 to 0.5 wt% based on the Y2O2S:Eu phosphor.
Figures 7 to 9 are respectively CIE chromaticity diagram plotting relations of contents of Eu as an activator for the Y2O2S:Eu phosphors and emission colors on the phosphor screen of the color cathode ray tube in the cases of an amount of red oxide red colorant of 0.1 wt% (Figure 7), 0.2 wt% (Figure 8), and 0.5 wt% (Figure 9).
In Figures 7 to 9, the points (A'), (B'), (C'), (D'), (E'), (F') and (G') respectively designate chromaticity points of the emission color at the content of Eu of 0.02, 0.03, 0.04, 0.05, 0.06, 0.07 and 0.08 gram-atom to 1 mole of Y2O2S as the main component. As it is clearly found from the chromaticity points, when the content of Eu as the activator in the Y2O2S:Eu phosphor increases, the x-coordinates of the chromaticity points oF the emission color increase and the ycoordinates thereof decreases whereby the emission color becomes deep red color to improve the chromaticity of the emission color.
The chromaticity allowed as the red (R) emission chromaticity on the phosphor screen of the color cathode ray tube has x-value of 0.620 or more y-value of 0.360 or less (range of hatching on the chromaticity diagram) and Eu used in the Y2O2S:Eu phosphor with a red colorant is expensive. Therefore, the content of Eu in the Y2O2 S:Eu red (R) emission phosphor is set in about 0.037-0.045 g-atom to 1 mole of Y2O2S except special color cathode ray tubes.
The inventors have studied to obtain a color cathode ray tube for deeper tone red (R) emission without a substantial increase of the content of Eu in the Y2O2S:Eu phosphor with a red colorant or obtain a color cathode ray tube for the same deep tone red (R) emission with lower content of Eu, the spectral transmittance distribution of the face plate glass (1) of the phosphor screen is changed from the flat distribution of the conventional clear glass to give selective absorption and the light emission from the phosphor is partially modified to apply it to a spectator whereby the chromaticity of the red (R) emission of the Y2O28:Eu red (R) emission phosphor with a red colorant Referring to Figure 10 to 13, the feature will be illustratecLin detail.
Figure 10 shows the spectral transmittance distribution of the face plate glass (1) on the phosphor screen of the cathode ray tube of the present invention a spectral transmittance curve (a) of the face plate glass (1) made of a clear glass and the emission spectral distribution (d) of the Y2O2S:Eu red phosphor with a red colorant.
Figure 10 (e), (f) (g) respectively show spectral transmittance curves of face plate glasses (1) made of each glass incorporating Nd203 at a content of 0.5, 1.0 or 1.5 wt% in a face plate glass made of the clear glass materials having a thickness of 10 mm (hereinafter referring to as
Nd-containing glass). The Nd-containing glass has a main sharp absorption band at 560-615 nm and sub-absorption bands in a region of 490545 nm.
The spectral transmittance curve of Ndcontaining glass has strong absorption band at the wavelength for the small peaks of the Y2O2S:Eu phosphor with the red colorant and has not a substantial absorption at the wavelength for the main peak of the phosphor as shown in Figure
10. Therefore, when the light emitted from the phosphor with the red colorant is passed through the face plate glass (1) made of the Nd-containing glass to the spectator, the emission of the phosphor with the red colorant is modified to give deeper red chromaticity shifting the emission color to long wavelength side the same as that of the increase of the content of Eu in the Y2O2S:Eu phosphor with the red colorant and to improve the chromacity of the emission color.
Figures 11 to 13 are respectively CIE chromaticity diagrams showing variations of the chromaticity given by passing the light emitted from the Y2O2S:Eu phosphors with the red colorant having various contents of Eu as an activator shown in Figures 7 to 9 through the face plate glass (1) made of the Nd-containing glass in comparison with the original chromaticity of the light emitted from the phosphor (points A', B', C',
D', E', F' and G').In Figures, the references (A'1), (B'1), (C ), (D'1), (E'1), (F'1), (G'1) respectively designate chromaticity points of the emission color in the case of the pass-through of the face plate glass (1) having a thickness of 10 mm and made of Nd-containing glass having a content of Nd2O3 of 0.5 wt%; and (A'2), (B'2), (C'2), (D'2), (E'2), (F'2), (G'2) respectively designate chromaticity points of the emission color in the case of a content of Nd2O3 of 1.0 wt%; and (A'3), (B'3), (C'3),
D'3), (E'3), (F'3), (G'3) respectively designate chromaticity points of the emission color in the case of a content of Nod203 of 1.5 wt%.
The amount of the red oxide red colorant particles based on the phosphor is 0.1 wt% (Figure 11), 0.2 wt% (Figure 12) and 0.5 wt% (Figure 13).
As it is clearly found in Figures, it required a content of Eu of 0.037 g-atom as the activator to
1 mole of Y2O2S in the Y2O2S:Eu phosphor with the red colorant though it may slightly differ depending upon the amount of the colorant in order to attain a desired red (R) emission in the case of the face plate glass (1) made of the conventional clear glass, whereas a desired red (R) emission can be given even though a content of Eu is only 0.025 g-atom to 1 mole of Y2O2S in the phosphor with 0.5 wt% of the red oxide red colorant in the case of the face plate glass (1) made of the Nd-containing glass having a content of Nd2O3 of 1.5 wt%.Therefore, the content of Eu which is remarkably expensive can be reduced to contribute to the remarkable reduction of the cost of the color cathode ray tube.
When the Y2O2S:Eu phosphor activated with 0.037 g-atom or more of Eu per 1 mole of Y2O2S is used in combination with the improved face plate glass, the chromaticity of the red (R) emission of the phosphor screen of the color cathode ray tube can be improved to be deeper without an increase of the content of Eu as the expensive material.
When a content of Eu in the Y2O2S:Eu phosphor is more than 0.07 g-atom to 1 mole of
Y202S, the brightness of the emission of the phosphor is disadvantageously, remarkably reduced.
The face plate glass can be a combination of a main face plate glass made of a clear glass and a front plate glass made of the Nd-containing glass.
Claims (3)
1. A color cathode ray tube which comprises a face plate glass containing neodymium oxide component at a content for effective optical effect corresponding to 0.3 to 1.5 wt% of neodymium oxide in a glass having a thickness of 10 mm; and a phosphor screen made of plural color phosphors formed on an inner surface of said face plate glass which comprises an europium-activated yttrium oxysulfide phosphor (Y2O2S:Eu) having Eu component at a content of 0.04 to 0.08 g-atom to 1 mole of Y2O2S as a red phosphor.
2. A color cathode ray tube which comprises a face plate glass containing neodymium oxide component at a content for effective optical effect corresponding to 0.3 to 1.5 wt% of neodymium oxide in a glass having a thickness of 10 mm; and a phosphor screen made of plural color phosphors formed on an inner surface of said face plate glass which comprises an europium-activated yttrium oxysulfide phosphor (Y2O2S:Eu) having Eu component at a content of 0.025 to 0.07 g-atom at 1 mole of Y2O2S as a red phosphor which is coated with red oxide red colorant particles in an amount of 0.05 to 0.5 wt% based on said phosphor.
3. A cathode ray tube substantially as herein particularly described.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2247081A JPS57136742A (en) | 1981-02-17 | 1981-02-17 | Color cathode-ray tube |
| JP2247781A JPS57136743A (en) | 1981-02-17 | 1981-02-17 | Color cathode-ray tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2093269A true GB2093269A (en) | 1982-08-25 |
| GB2093269B GB2093269B (en) | 1984-08-30 |
Family
ID=26359699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8202538A Expired GB2093269B (en) | 1981-02-17 | 1982-01-29 | Color cathode ray tube |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR870001634B1 (en) |
| DE (1) | DE3205031A1 (en) |
| GB (1) | GB2093269B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0178024A2 (en) * | 1984-10-09 | 1986-04-16 | Koninklijke Philips Electronics N.V. | Direct luminescent cathode ray device with improved color filtering system |
| EP0621624A1 (en) * | 1993-04-20 | 1994-10-26 | Koninklijke Philips Electronics N.V. | Colour display device |
| WO2004059686A1 (en) * | 2002-12-26 | 2004-07-15 | Kabushiki Kaisha Toshiba | Display |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0625848B2 (en) * | 1985-07-08 | 1994-04-06 | 富士写真フイルム株式会社 | Color image forming method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3926837A (en) * | 1974-10-29 | 1975-12-16 | Westinghouse Electric Corp | Method for the preparation of europium activated yttrium oxysulfide |
| JPS5545712A (en) * | 1978-09-27 | 1980-03-31 | Hitachi Ltd | Manufacture of pigment-adhered red luminescent fluophor |
| DE3012055A1 (en) * | 1980-03-28 | 1981-10-08 | Videocolor GmbH, 7900 Ulm | Pigmenting phosphor particles by wet process with calcination - in air to increase adhesion and impart hydrophilic nature, useful in colour picture tube |
| EP0041339B1 (en) * | 1980-05-29 | 1984-08-08 | Mitsubishi Denki Kabushiki Kaisha | Color cathode ray tube |
| DE3045970A1 (en) * | 1980-12-05 | 1982-07-08 | Videocolor GmbH, 7900 Ulm | Applying pigment to surface of fluorescent grains - by grinding, and fixing with resin emulsion |
-
1982
- 1982-01-29 GB GB8202538A patent/GB2093269B/en not_active Expired
- 1982-02-09 KR KR8200543A patent/KR870001634B1/en active
- 1982-02-12 DE DE19823205031 patent/DE3205031A1/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0178024A2 (en) * | 1984-10-09 | 1986-04-16 | Koninklijke Philips Electronics N.V. | Direct luminescent cathode ray device with improved color filtering system |
| EP0178024A3 (en) * | 1984-10-09 | 1986-07-23 | N.V. Philips' Gloeilampenfabrieken | Direct luminescent cathode ray device with improved color filtering system |
| EP0621624A1 (en) * | 1993-04-20 | 1994-10-26 | Koninklijke Philips Electronics N.V. | Colour display device |
| WO2004059686A1 (en) * | 2002-12-26 | 2004-07-15 | Kabushiki Kaisha Toshiba | Display |
| US7202594B2 (en) | 2002-12-26 | 2007-04-10 | Kabushiki Kaisha Toshiba | Display device panel with an emitting fluorescent film composed of red fluorescent particles covered with a red pigment |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3205031A1 (en) | 1983-02-24 |
| KR830009640A (en) | 1983-12-22 |
| KR870001634B1 (en) | 1987-09-17 |
| GB2093269B (en) | 1984-08-30 |
| DE3205031C2 (en) | 1987-04-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) |
Effective date: 20000126 |
|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20010129 |