CN1169183C - Contrast improved colour CRT and its manufacture - Google Patents
Contrast improved colour CRT and its manufacture Download PDFInfo
- Publication number
- CN1169183C CN1169183C CNB00135521XA CN00135521A CN1169183C CN 1169183 C CN1169183 C CN 1169183C CN B00135521X A CNB00135521X A CN B00135521XA CN 00135521 A CN00135521 A CN 00135521A CN 1169183 C CN1169183 C CN 1169183C
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- China
- Prior art keywords
- phosphorus
- display screen
- panel
- coating
- glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 239000011521 glass Substances 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 16
- 239000010439 graphite Substances 0.000 claims abstract description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 37
- 229910052698 phosphorus Inorganic materials 0.000 claims description 31
- 239000011574 phosphorus Substances 0.000 claims description 31
- 239000011159 matrix material Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 7
- 239000011358 absorbing material Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 239000000243 solution Substances 0.000 description 13
- 238000010894 electron beam technology Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000008021 deposition Effects 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000002310 reflectometry Methods 0.000 description 4
- 239000003086 colorant Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000012010 growth Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003698 anagen phase Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H01J29/30—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines
- H01J29/32—Luminescent screens with luminescent material discontinuously arranged, e.g. in dots, in lines with adjacent dots or lines of different luminescent material, e.g. for colour television
- H01J29/327—Black matrix materials
-
- 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
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
-
- 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
- H01J9/2278—Application of light absorbing material, e.g. between the luminescent areas
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
Abstract
The invention relates to a method of manufacturing a colour cathode-ray tube (1), in which a graphite coating (22) of variable thickness is interposed between the glass faceplate (2) of the tube and the phosphors (25, 26, 27) intended to reproduce a colour image. The purpose of the coating (22) is to reduce the transmission of the glass, of which the faceplate is composed, to a defined value.
Description
Technical field
The method of the picture tube that the present invention relates to produce the color cathode ray tube display screen and combine with display screen, the present invention by reducing the reflectivity of kinescope panel, improves the contrast of the image that forms especially on display screen.
Background technology
Well also comfortable for the observability that makes the image that on CRT display screen, forms, in all internal environments, under the contingent lighting condition, be necessary to make display screen can have high-contrast.
In order to improve the contrast of the image that forms on CRT display screen, a normally used solution comprises, uses a lighttight carbon granules subband matrix between the row of the luminescent material of forming display screen.This structure improves by the display panel of introducing with glass production with low transmission coefficients; And when picture tube was turned off, such panel had the outward appearance of black, and this meets observer's taste.But in fact the use of low transmission coefficients glass produces a lot of problems.
For example, coefficient must be fit to the size of picture tube, and is fit to the type of the electron gun of use.
And present trend trends towards having the cathode ray tube of more flat panel; In order mechanically to bear the vacuum that exists in the picture tube, so particularly in the position at angle, the thickness of panel increases.On the angle of panel and middle thickness, exist very big difference like this.For such picture tube, the result can not use to have the too glass of low transmission coefficients, because the difference of the light that the center of display screen and border produce is too obvious concerning the observer.
Other technology is used to improve the contrast of image; For example, the use of the filter layer between display screen inside and luminescent material, as at United States Patent (USP) 4,135, described in 112, this makes uses complicatedly, and is expensive.Be coated with one deck filter in the outside of display screen, as at United States Patent (USP) 4,987, described in 338, also be expensive, and just think just to use when picture tube is finished, and coating is to the shock-sensitive of chemistry or grinding.
Like this, need provide a kind of and use simply and not expensive solution, the reflectivity of the panel of permission cathode ray tube is reduced to the value of setting.
Summary of the invention
Color cathode ray tube according to the present invention comprises the face glass on the inner surface, is placed with the phosphorus array on the inner surface and forms display screen.
Wherein the coating of light absorbing material is placed between the inner surface of phosphorus and panel, reduces the transmission coefficient that light passes panel.
Description of drawings
The advantage of the present invention and it below description and the help of accompanying drawing will more clearly be understood down, accompanying drawing comprises:
Fig. 1 has drawn according to cathode ray tube of the present invention, is phantom;
Fig. 2 has illustrated the profile according to the image display panel of prior art, and it is created in the inner surface of the face glass of picture tube;
Fig. 3 has drawn according to the section part of image display panel of the present invention;
Fig. 4 is the top view according to the inner surface of the face glass of cathode ray tube of the present invention;
Fig. 5 is the profile of the identical inner surface in the process of the present invention.
Embodiment
Illustrated as Fig. 1, cathode ray tube 1 according to the present invention comprises approximately flat panel 2 and peripheral skirt 3.Panel links to each other with the funnel type rear portion 4 of picture tube by the glass melting sealing.The afterbody 5 of picture tube is around electron gun 6, and electron beam is wherein selected the display screen 13 of cover 8 irradiation luminous phosphorus by color.Metal support 9,10,11 and 12 is supported cover in picture tube inside to the accurate distance of display screen.
Traditionally, color cathode ray tube comprises the phosphorus array, in case the electron-beam excitation of being sent by electron gun they with luminous.This an array comprises the red phosphorus of representing primary colors, green phosphorus and blue phosphorus, therefrom produces coloured image.Phosphorus or be arranged in continuous row perhaps is arranged in the point of the different colours of triangular structure.Making sticks to the technology of the phosphorus of face glass inner surface, is shadow seal type, and wherein three look phosphorus arrays form by light non-transmittable layers being exposed to pass in the light of selecting the hole on the cover.Each array is realized and processing by baking, is obtained desirable the adhering to glass substrate.For the color separated that improves contrast and obtain, usually on glass surface, deposit the matrix of light-proof material in advance, carbon particle for example, the phosphorus array is deposited over the exposed portions serve of matrix then.Fig. 2 with sectional views this structure.Carbon ribbon matrix 21 is deposited over the inner surface of panel 2, is red phosphorus row 25, green phosphorus row 26 and blue phosphorus row 27 then.Below, whole set is covered by the organic material film, and it is as the substrate of very thin metal coating 20.This coating is made of aluminium usually, has the function that the light that luminescent material is sent by mirror effect reflexes to observer's direction, increases the brightness of display screen.In the subsequent step of production method, the organic material film is by the removal of burning in high temperature furnace.The application of conventional art throws into question in the process of new display screen once more, and wherein the outer surface of panel comes down to flat.For the vacuum that the end step that mechanically is supported in manufacturing produces in picture tube, panel is smooth more, and glass must be thick more.For fear of the glass that must use volume, because cost or too much weight keep enough mechanical strengths simultaneously, the thickness that the thickness that changes panel makes the center is possible less than the thickness at edge.The glass that use has a low optical transmission coefficient means that the transmission by each regional light of display screen becomes very different then.This is because the edge bigger than thickness, center of display screen will have littler weakening effect.Screen will not have consistent brightness then, and for the identical energy that phosphorus provides, edge and angle seem darker.
In process of the present invention, the glass that uses highly transparent is as substrate, and by deposited the coating of light absorption before the phosphorus deposition, it is possible adjusting its outward appearance to the observer.The optical transmission coefficient of panel is adjusted to required value like this, i.e. the value on the surface of filter glass composition.
The use of this coating is by Fig. 3,4 and 5 explanations.
Before the phosphorus deposition, coating 22 is deposited on the face glass 2.This coating can be placed on the matrix array 21 of light tight carbon row, if or glass do not comprise matrix array 21, then only be positioned on glass.The solution that is used to produce this coating is the suspension-turbid liquid of the graphite aqueous solution.Preferably have little diameter for the particle in the solution, this has several advantages:
The accurate control of-layer thickness allows the light transmittance of panel accurately to adjust, and adjusts to the value of needs according to thickness;
-graphite particle is full of the aperture of matrix 21, and carbon particle wherein has bigger diameter.As a result, the contrast of display screen improves, and graphite tape seems more black then;
The interface that-this equadag coating 22 produces causes smooth surface, wherein the deposition rate of phosphorus directly be deposited on adhere on the carbon ribbon of matrix 21 better.As a result, the brightness that increases image on display screen by the weight that increases the phosphorus that uses is possible, and needn't worry fluorescent material because its weight becomes easily separated.
Owing to these reasons, preferably select suspension-turbid liquid, wherein the size of graphite particle is arranged in the distribution that is no more than 300nm.For example the graphite of Shi Yonging is selected from the CB product group that Achenson Colloids sells.The solution that uses preferably includes traditional dispersant and surfactant, and they use in the display screen of making cathode ray tube usually.
The example that is used for producing the solution of coating 22 illustrates in following table:
Table 1
| Material concentration | Amount * 10kg | The percentage of solution (%) |
| Graphite, 10% | 500 | ?0.5 |
| Deionized water | 8800 | ?99.25 |
| Dispersant, 1% | 500 | ?0.05 |
| Surfactant, 10% | 200 | ?0.2 |
The whole bag of tricks can be used for the inner surface of solution deposition at panel.Can use spraying, and in this case, the quantity of flow velocity and surperficial upper outlet will determine the final thickness of coating.This can realize that solution will scatter by the inner surface of centrifuge at display screen by the center deposition certain quantity solution at screen, and the primary quantity of product and centrifugal speed and time are determined the distribution of coating layer thickness on the display screen then.
After deposition, the graphite suspension-turbid liquid is dried, and for example uses heating head to produce infrared ray, forms coating 22.
In a preferred embodiment, the thickness of coating 22 is uneven on the whole surface of display screen inner face, but thicker on edge and angle at the center of display screen ratio.As illustrated in the Figure 4 and 5, in the situation below, the thickness ratio of face glass 2 on the angle by 53 and 51 display screens of representing separately is bigger at the thickness of core, and be bigger at the thickness at edge at the thickness ratio at center by 50 and 52 coatings of representing separately 22.The light transmittance of panel 2 is uniformly like this, and the brightness of display screen is consistent when operation.
The subduplicate ratio of the reflection coefficient of the luminous energy counter plate by panel transmission, be BCT (Brightness/Contrast Performance, be the brightness/contrast performance) and measure at the core of display screen usually, be the index that must keep a sufficiently high value.It measures the compromise of two facts, and promptly panel must must enough hang down the image that contrast is provided by reflectivity enough transparent to the luminous energy that passes it and display screen.
The measurement that following table 2 provides has shown that the use of coating 22 does not influence BCP.This is because although the luminous efficiency of image display panel reduces about the graphite concentration of coating, owing to cause light to reduce by the transmission coefficient of panel, this reduces to compensate by the increase from the contrast that reduces to cause of the reflectivity of panel.BCP only changes very slightly to the graphite concentration of putting into solution generation coating 22 subsequently, and this is like this when the weight grade of graphite concentration about 0.03% to 0.9%.
Table 2
| Graphite concentration (percentage by weight %) | The percentage (%) of panel transmission | The luminous efficiency of picture tube (lumen/W) | ?BCP | |
| The center | The angle | |||
| 0.00 | ?42.7 | ?38.3 | ?28.3 | ?265 |
| 0.30 | ?24.1 | ?33.7 | ?21.8 | ?263 |
| 0.70 | ?12.8 | ?16.8 | ?17.2 | ?266 |
After figure layer 22 drying, the phosphorus of every kind of primary colors continues to be deposited in a conventional manner above the figure layer.This production method provides special advantage, and it is derived from the green phosphorus of successive sedimentation, blue phosphorus, red phosphorus then then.This be because these phosphorus do not have identical efficient and, for the identical energy that the respective electronic rifle provides, green phosphorus has the highest efficient, is blue phosphorus then, is red phosphorus at last.Electron beam must be corrected according to energy usually subsequently, comes the faithful reappearance coloured image, for example in order to obtain and actual close white.This correction is according to the ratio that sends from electron gun between the electric current that obtains loyal image, and produces by the additional electronic circuit device.
The present invention can avoid the correction to the value that produces electron beam current, because in process of production, green phosphorus is at first deposited, growth then deposits blue phosphorus with continuous with about identical mode then, is red phosphorus then.After each growth, be exposed to the coating 22 slight attenuation in the growth phase.In identical display screen area, than thicker under blue phosphorus, ratio is thicker under red phosphorus under blue phosphorus under green phosphorus for coating 22 subsequently.These difference in thickness make the electron beam current of being given produce approximately consistent light quantity to all types of phosphorus becomes possibility.The ratio that produces white electron beam current has been avoided the needs to the circuit of revising electron beam intensity so in fact near 1 subsequently.
And, the invention provides other advantage and provide solution relevant issues.
The fact that can use transparent glass panel more is an advantage to the lifelong circulation of environment and picture tube, because the glass that uses comprises less heavy metal, it is generally used for making the glass deepening.
From the viewpoint of industry, the present invention allows the picture tube with identical glass production several types, and the minimizing of flexibility and production cost is provided like this.In the past, every type panel must have a transparency, for example, was applicable to its size and the interior technology of using of picture tube.From now on, final transparency obtains by the thickness of adjusting coating 22.As a result, be easier to the rate of finished products of control panel thus.
And, the invention is not restricted to use the suspension-turbid liquid of graphite solution to produce coating 22, for convenience, preferentially select graphite, because this raw material use usually in the stage of producing picture tube.Any other material with absorbing light characteristic can be as alternative.
Claims (4)
1. a color cathode ray tube (1) comprises face glass (2), and its surface has been placed phosphorus array (25,26,27), forms display screen (13),
It is characterized in that phosphorus is deposited on the light absorbing material coating (22), light absorbing material coating (22) has thickness (50,52), and the thickness of light absorbing material coating is thicker in its edge in the display screen center.
2. according to the cathode ray tube (1) of claim 1, it is characterized in that light absorbing material coating (22) is placed on the light tight matrix array (21).
3. according to the cathode ray tube (1) of claim 1 or 2, it is characterized in that light absorbing material coating (22) is made of graphite particle.
4. according to the cathode ray tube (1) of claim 3, it is characterized in that most of graphite particle has the size less than 0.3 μ m.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI99A002325 | 1999-11-05 | ||
| IT1999MI002325A IT1313925B1 (en) | 1999-11-05 | 1999-11-05 | METHOD OF MANUFACTURE OF A SCREEN FOR COLORED CATHODIC RAYS TUBES AND INCORPORATING TUBE SUCH SCREEN. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1295335A CN1295335A (en) | 2001-05-16 |
| CN1169183C true CN1169183C (en) | 2004-09-29 |
Family
ID=11383912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB00135521XA Expired - Fee Related CN1169183C (en) | 1999-11-05 | 2000-11-04 | Contrast improved colour CRT and its manufacture |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1098348A3 (en) |
| JP (1) | JP2001167712A (en) |
| KR (1) | KR20010051401A (en) |
| CN (1) | CN1169183C (en) |
| IT (1) | IT1313925B1 (en) |
| MX (1) | MXPA00010841A (en) |
| MY (1) | MY136611A (en) |
| TW (1) | TW501367B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010055947A (en) * | 2008-08-28 | 2010-03-11 | Canon Inc | Face panel for color image display, panel for color image display using the face panel, and color image display equipped with the panel |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4132919A (en) * | 1977-12-12 | 1979-01-02 | Lockheed Missiles & Space Company, Inc. | Absorbing inhomogeneous film for high contrast display devices |
| US4310783A (en) * | 1979-05-07 | 1982-01-12 | Temple Michael D | Cathode ray tube face plate construction for suppressing the halo having a low reflection and method |
| JPS577048A (en) * | 1980-06-16 | 1982-01-14 | Toshiba Corp | Fluorescent light emission screen |
| JPS60101831A (en) * | 1983-11-07 | 1985-06-05 | Mitsubishi Electric Corp | Light-absorbent film forming method for color picture tube |
| KR950014541B1 (en) * | 1991-05-24 | 1995-12-05 | 미쯔비시덴끼 가부시끼가이샤 | Cpt having intermediate layer |
-
1999
- 1999-11-05 IT IT1999MI002325A patent/IT1313925B1/en active
-
2000
- 2000-10-16 TW TW089121584A patent/TW501367B/en not_active IP Right Cessation
- 2000-10-31 EP EP00403032A patent/EP1098348A3/en not_active Withdrawn
- 2000-11-01 JP JP2000334711A patent/JP2001167712A/en active Pending
- 2000-11-02 KR KR1020000064858A patent/KR20010051401A/en not_active Application Discontinuation
- 2000-11-03 MX MXPA00010841A patent/MXPA00010841A/en unknown
- 2000-11-04 CN CNB00135521XA patent/CN1169183C/en not_active Expired - Fee Related
- 2000-11-06 MY MYPI20005190A patent/MY136611A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP1098348A2 (en) | 2001-05-09 |
| TW501367B (en) | 2002-09-01 |
| ITMI992325A0 (en) | 1999-11-05 |
| MXPA00010841A (en) | 2003-06-06 |
| IT1313925B1 (en) | 2002-09-26 |
| ITMI992325A1 (en) | 2001-05-05 |
| KR20010051401A (en) | 2001-06-25 |
| CN1295335A (en) | 2001-05-16 |
| EP1098348A3 (en) | 2002-07-17 |
| JP2001167712A (en) | 2001-06-22 |
| MY136611A (en) | 2008-10-31 |
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