CN1150588C - Shield for increasing color purity allowance at screen corner of color CRT and its design method - Google Patents
Shield for increasing color purity allowance at screen corner of color CRT and its design method Download PDFInfo
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- CN1150588C CN1150588C CNB991237854A CN99123785A CN1150588C CN 1150588 C CN1150588 C CN 1150588C CN B991237854 A CNB991237854 A CN B991237854A CN 99123785 A CN99123785 A CN 99123785A CN 1150588 C CN1150588 C CN 1150588C
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- upright opening
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Abstract
The present invention relates to a screen shield and a design method thereof for increasing color purity allowance at screen corners of a color CRT. The screen shield is made of sheet metal which is provided with a plurality of focusing holes, and is in a spherical surface shape. The distance of the vertical holes is P<V>1 in a position corresponding to the center area of which the curvature radius is longer on the inner surface of a screen, the distance of the vertical holes is P<V>2 in a position corresponding to the outer edge area of which the curvature radius is shorter on the inner surface of the screen, and the P<V>2 is smaller than the P<V>1. Each focusing hole is crossedly arranged along a longitudinal direction, and the distances of the vertical holes are gradually reduced along the directions of both sides of a horizontal axis of a screen center coordinate. A triad-color electron beam just can pass through each focusing hole and is accurately projected to corresponding fluorescent points in all the visual ranges of the inner surface of the screen.
Description
Technical field
The present invention relates to a kind of shadow mask (mask) and method for designing thereof that can be used for increasing color cathode ray tube (color CRT) corner screen (periphery of the display screen) colour purity allowance (color puritytolerance), especially the novel distribution method that refers to focal aperture (aperture) on a kind of shadow mask, can reduce the projection side-play amount (landing tilt) of electron beam (electron beam) by this method in corner screen, effectively increase the visual range of screen, and improve the colour purity adjustment remaining of corner screen video image.
Background technology
Referring to Fig. 1, in general conventional color cathode ray tube 10, be positioned on the position of screen 14 inboard preset distances, be equipped with a shadow mask 26, this shadow mask 26 is made by a high-tension sheet metal, is the body that is dome shape, which is provided with the focal aperture 26a that several are equidistant arrangement, the three-color electron beam 22 that this focal aperture 26a just can make the electron gun 20 of color cathode ray tube 10 be produced runs through wherein, is projected on the corresponding phosphor dot 24 that screen 14 inner faces lay.So shadow mask is equivalent to the negative electrode (color selectioncathode) that selects of the same colour, utilize focal aperture 26a, the three-color electron beam 22 that makes the electron gun 20 of color cathode ray tube 10 be produced can pass each focal aperture 26a, and be projected to exactly on the corresponding phosphor dot 24 of screen 14 inner faces.
Referring to Fig. 2, in general, edge is formed with a skirt section 44 (skirt) around the shadow mask 26 in the conventional color cathode ray tube, this skirt section 44 is fixed on the rectangular framework 52 by welding manner, edge in framework 52, respectively by metal setting element 48a, 48b, 48c and 48d, be fixed in the inboard of the glass encapsulating body 46 of color cathode ray tube, setting element 48a, 48b, 48c, and the locate mode of 48d is: an end is fixed on the framework 52 of shadow mask with welding manner, the other end then be fixed on respectively with glass encapsulating body 46 inboard correspondence positions on set projection 50a, 50b, on 50c and the 50d, make shadow mask 26 be located in the inboard corresponding position of glass encapsulating body 46, and and 14 designed distances that are maintained fixed of screen of color cathode ray tube 10.
On conventional color cathode ray tube, because screen and shadow mask all are along centrosymmetric dome shape, the screen of dome shape and shadow mask very easily make the convergent point (electronspot) of three-color electron beam on the screen inner surface be offset (tilt), and this skew situation is the most serious with the corner screen place especially.
Referring to Fig. 3, three convergent point 34R, 34Gs, the 34B of three-color electron beam on corner screen 32, to produce an angular deflection (angle tilt) because of the design of the dome shape of screen and shadow mask, and make electron beam can't be projected to exactly on the corresponding phosphor dot that the screen inner face laid.
Referring to Fig. 4, for proofreading and correct the defective of this convergent point skew, conventional practice is to adopt a kind of so-called Vari-Pv mode, make 37,38 of the transversely arranged adjacent two focal aperture row in these shadow mask 36 upper edges, vertically the upright opening of two adjacent focal apertures 35 is apart from Pv, along the variation of successively decreasing of the horizontal direction (being directions X) of screen, the distance between each focal aperture that the shadow mask upper edge is transversely arranged and the central horizontal line of screen (being X-axis) is successively decreased along the left and right sides direction of screen.This upright opening generally calculates by following formula apart from the design of Pv:
Pv (x)=Pv0* (1+a
1x
2+ a
2x
4+ a
3x
6+ ...), this formula is one to be the function of parameter with the coordinate distance of focal aperture on the trunnion axis X of center Screen coordinate.
Traditionally, the shadow mask that designs by this kind Vari-Pv mode is installed in inner face radius of curvature (theradius of curvature) on the screen of fixed constant (constant) time, though, some compensation and corrective action are arranged to the skew of three-color electron beam convergent point on the screen inner surface.Yet, birth along with flat square and high-res color cathode ray tube, three-color electron beam is in the position, four limits of adjacent screen visual range, will be less because of the inner face radius of curvature in the new-type screen of color cathode ray tube of this kind corner, and it is make the phenomenon of three-color electron beam, even even more serious than traditional screen with constant radius of curvature in this position generation angular deflection.At this moment, the shadow mask by traditional Vari-Pv mode designs promptly can't effectively compensate the angular deflection phenomenon that three-color electron beam is taken place on all visual ranges of screen, causes corner screen generation colour purity condition of poor.The manufacturer of general color cathode ray tube all tends to dwindle the effective area of shadow mask for remedying this defective, to avoid screen inner face radius of curvature variation zone greatly, improves the colour purity quality of corner screen video image.But this practice but makes the visual range of screen dwindle thereupon.
Summary of the invention
The objective of the invention is to design a kind of shadow mask and method for designing thereof that increases screen of color cathode ray tube corner colour purity allowance, the present invention is in order to solve conventional planar right angle and high-res color cathode ray tube, the phenomenon of angular deflection easily takes place in its three-color electron beam at the convergent point of corner screen, the shortcoming that will have a strong impact on video image colour purity quality on this position is made, the present invention is by adopting the two-stage compute mode, focal aperture on the design shadow mask, the shadow mask of made can increase the colour purity allowance of corner screen according to this, and need not revise under the situation of screen of color cathode ray tube effective area, obtain bigger screen visual range.
The object of the present invention is achieved like this: a kind of shadow mask that increases screen of color cathode ray tube corner colour purity allowance, comprise a high-tension sheet metal, sheet metal is dome shape, on establish more than one focal aperture, sheet metal is installed in the position of the inboard preset distance of screen of color cathode ray tube, pass on the corresponding phosphor dot that focal aperture is incident upon the screen inner face by the three-color electron beam that colour cathode-ray tube electron gun produced, it is characterized in that: the middle section corresponding position bigger on the described sheet metal with described screen inner face radius of curvature, between being listed as along transversely arranged adjacent two focal apertures, vertically the upright opening of two adjacent focal apertures distance is Pv1; The outer edge area corresponding position less with described screen inner face radius of curvature on the described sheet metal, the upright opening of vertical adjacent two focal apertures are apart from being Pv2, and Pv2 is less than Pv1; The upright opening of described focal aperture successively decreases apart from two side directions along described screen center coordinate trunnion axis.
A kind of mask design method that increases screen of color cathode ray tube corner colour purity allowance of the present invention, it is characterized in that: be to design on the shadow mask upright opening corresponding to the focal aperture of the bigger middle section of screen inner face radius of curvature respectively apart from Pv1 by the two-stage compute mode, and corresponding to the upright opening of the focal aperture of the less outer edge area of screen inner face radius of curvature apart from Pv2; Ask that along transversely arranged adjacent two focal apertures row the upright opening distance of vertical adjacent two focal apertures successively decrease along two side directions of screen center's coordinate trunnion axis, and Pv2 is less than Pv1; Each focal aperture on the described shadow mask just can make the three-color electron beam that electron gun produced of color cathode ray tube pass, and accurately is incident upon on the phosphor dot corresponding in all visual ranges of screen inner face.
Described upright opening is respectively that each focal aperture is the function of parameter at screen center's coordinate along the distance of the coordinate on the trunnion axis apart from Pv1 and Pv2.
Described upright opening is respectively that each focal aperture is the quadratic function of parameter at screen center's coordinate along the distance of the coordinate on the trunnion axis apart from Pv1 and Pv2.
Described upright opening apart from the computing formula of Pv1 is:
Pv1＝0.135*(1-1.21*10
6*X
2)；
Described upright opening apart from the computing formula of Pv2 is:
Pv2＝0.132*(1.246-13.397*10
-6*X
2)；
Described X represent each focal aperture at screen center's coordinate along the coordinate distance on the trunnion axis.
Shadow mask of the present invention and method for designing thereof, each focal aperture longitudinally is staggered on the shadow mask, be that the position that changes with screen inner face radius of curvature is as the line of demarcation, utilize the two-stage compute mode, on this shadow mask corresponding to the bigger middle section of screen inner face radius of curvature, design the upright opening of adjacent focal aperture on the shadow mask apart from Pv1 in the Vari-Pv mode, and on this shadow mask corresponding to the less outer edge area of screen inner face radius of curvature, the zone that promptly surpasses the effective visual range of screen, then design the upright opening of adjacent focal aperture on the shadow mask apart from Pv2 in the bigger Vari-Pv mode of another compensation rate, make designed shadow mask make suitable compensation respectively on screen according to the difference that the angular deflection amount takes place three-color electron beam, make the color cathode ray tube can be under the situation of not revising the screen effective area, obtain bigger screen visual range, and the focal aperture of guaranteeing shadow mask can make three-color electron beam be projected to exactly on the phosphor dot of screen inner face correspondence position, effectively improves the brightness of video image on the corner screen, colour purity and colour purity are adjusted remaining.
Description of drawings
Fig. 1 is the structural representation of conventional color cathode ray tube.
Fig. 2 is the syndeton schematic diagram of shadow mask and glass encapsulating body among Fig. 1.
Fig. 3 is the convergent point distributing position schematic diagram of three-color electron beam on the screen of color cathode ray tube.
Fig. 4 is traditional distribution relation schematic diagram that utilizes each focal aperture on the shadow mask that the Vari-Pv mode makes.
Fig. 5 is the schematic diagram that concerns that the present invention utilizes shadow mask that two-stage Vari-Pv mode makes and screen.
Fig. 6 is the distribution relation schematic diagram that the present invention utilizes each focal aperture on the embodiment shadow mask that two-stage Vari-Pv mode makes.
Embodiment
Further specify technology of the present invention below in conjunction with embodiment and accompanying drawing:
Address before Fig. 1 to Fig. 4 illustrates, repeat no more.
Referring to Fig. 5, shadow mask is 62 among the figure, and middle section is 64, and focal aperture is 62a, outer edge area 66.
The present invention installs a shadow mask 62 on a preset distance position of a screen of color cathode ray tube 60 inboards.Etching has several focal apertures 62a on the shadow mask 62, these screen 60 surfaces are according to the size of its radius of curvature, can be divided into bigger middle section of a radius of curvature 64 and the less outer edge area 66 of a radius of curvature, middle section 64 is more smooth zones, screen 60 inboards, 66 of outer edge area are the more uneven zones of adjacent screen 60 peripheries, this two interregional existence, one line of demarcation 68, this line of demarcation 68 is D with the distance of these screen 60 central points.Because screen 60 is rectangle among the present invention, so this distance D will change along the path in this line of demarcation 68.
Because the screen 60 of color cathode ray tube is to be distinguished into the different zone of two radius of curvature with line of demarcation 68,, on the surface corresponding to screen 60 inner face middle sections 64 on the shadow mask 62, press the first following formula so the present invention promptly utilizes this characteristic:
Pv1=0.135* (1-1.21*10
-6* X
2), calculate between the transversely arranged adjacent two focal apertures row in shadow mask 62 upper edges, vertically the upright opening of two adjacent focal aperture 62a is apart from Pv1, the position of the focal aperture 62a that is offered in view of the above, the three-color electron beam that just can make colour cathode-ray tube electron gun produce can pass this focal aperture 62a, is projected to exactly on the phosphor dot of screen 60 inner face middle sections 64 correspondences.In this first formula, X is used to represent the coordinate distance of focal aperture on the trunnion axis X of screen center's coordinate.
The present invention is again on the surface corresponding to the outer edge area 66 of screen 60 inner faces on the shadow mask 62, by the second following formula:
Pv2=0.132* (1.246-13.397*10
-6* X
2), calculate between the transversely arranged adjacent two focal apertures row in shadow mask 62 upper edges, vertically the upright opening of two adjacent focal aperture 62a is apart from Pv2, the position of the focal aperture 62a that is offered in view of the above, just can make the three-color electron beam that electron gun produced of this color cathode ray tube, can pass each focal aperture 62a, be projected to exactly on the phosphor dot of outer edge area 66 correspondences of screen 60 inner faces.
The present invention utilizes the Vari-Pv compute mode of two-stage, designing respectively on the zones of different surface of shadow mask, along between transversely arranged adjacent two focal apertures row, the upright opening distance of vertical adjacent two focal apertures, each focal aperture of being offered, just can make three-color electron beam pass, be projected to exactly on the corresponding phosphor dot on the screen inner face different curvature radius zone, designed shadow mask can increase the colour purity allowance of corner screen, and, obtain bigger screen visual range need not to revise under the situation of screen of color cathode ray tube effective area.
Shown in Figure 5 is the preferred embodiment that is example with 15 inches screens of the present invention, the radius of curvature of the inner face middle section 64 of this screen 60 is 900R, the radius of curvature of its outer edge area 66 is 7R, so effective visual range of this screen 60 is about 14 inches, cornerwise distance D is 13.89 inches between two interregional lines of demarcation 68 and screen 60 central points.
Referring to Fig. 6, utilize two-stage Vari-Pv design of the present invention, on shadow mask 72, design upright opening apart from being the focal aperture 74 of Pv1 by first formula, this focal aperture 74 can effectively compensate the angular deflection phenomenon that three-color electron beam is taken place in the visual range of the trunnion axis X=0-135.49mm of its central coordinate of screen upper edge.If effective visual range of this screen is 14.07 inches, then effective compensation range of this shadow mask 72 will increase to 137.36mm by 135.49mm.In this embodiment, the present invention apart from being the focal aperture 74 of Pv2, then can compensate the angular deflection phenomenon that three-color electron beam is taken place in other visual range by the designed upright opening that goes out of second formula on screen.So, utilize the designed shadow mask of two-stage Vari-Pv compute mode of the present invention, can compensate the angular deflection phenomenon that three-color electron beam is produced in all visual ranges of screen, the visual range that makes screen is by 13.89 " be increased to 14.07 ", and effectively improve the colour purity unfavorable condition that occurs in the corner screen place, guarantee to have good colour purity picture.
The above only is a preferred embodiment of the present invention, and the interest field that the present invention advocated is not limited thereto, all personages in the art, and according to the disclosed technology contents of the present invention, the equivalence of being done changes, and all should belong to protection scope of the present invention.
Claims (2)
1. shadow mask that can increase screen of color cathode ray tube corner colour purity allowance, comprise a high-tension sheet metal, sheet metal is dome shape, on establish more than one focal aperture, sheet metal is installed in the position of the inboard preset distance of screen of color cathode ray tube, pass on the corresponding phosphor dot that focal aperture is incident upon the screen inner face by the three-color electron beam that colour cathode-ray tube electron gun produced, it is characterized in that: the middle section corresponding position bigger on the described sheet metal with described screen inner face radius of curvature, between being listed as along transversely arranged adjacent two focal apertures, vertically the upright opening of two adjacent focal apertures distance is Pv1; The outer edge area corresponding position less with described screen inner face radius of curvature on the described sheet metal, the upright opening of vertical adjacent two focal apertures are apart from being Pv2, and Pv2 is less than Pv1; The upright opening of described focal aperture successively decreases apart from two side directions along described screen center coordinate trunnion axis;
Described upright opening apart from the computing formula of Pv1 is:
Pv1＝0.135*(1-1.21*10
-6*X
2)；
Described upright opening apart from the computing formula of Pv2 is:
Pv2＝0.132*(1.246-13.397*10
-6*X
2)；
Described X represent each focal aperture at screen center's coordinate along the coordinate distance on the trunnion axis.
2. mask design method that can increase screen of color cathode ray tube corner colour purity allowance, it is characterized in that: be to design on the shadow mask upright opening corresponding to the focal aperture of the bigger middle section of screen inner face radius of curvature respectively apart from Pv1 by the two-stage compute mode, and corresponding to the upright opening of the focal aperture of the less outer edge area of screen inner face radius of curvature apart from Pv2; Along between transversely arranged adjacent two focal apertures row, the upright opening distance of vertical adjacent two focal apertures successively decrease along two side directions of screen center's coordinate trunnion axis, and Pv2 is less than Pv1; Each focal aperture on the described shadow mask just can make the three-color electron beam that electron gun produced of color cathode ray tube pass, and accurately is incident upon on the phosphor dot corresponding in all visual ranges of screen inner face;
Described upright opening apart from the computing formula of Pv1 is:
Pv1＝0.135*(1-1.21*10
-6*X
2)；
Described upright opening apart from the computing formula of Pv2 is:
Pv2＝0.132*(1.246-13.397*10
-6*X
2)；
Described X represent each focal aperture at screen center's coordinate along the coordinate distance on the trunnion axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991237854A CN1150588C (en) | 1999-11-23 | 1999-11-23 | Shield for increasing color purity allowance at screen corner of color CRT and its design method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991237854A CN1150588C (en) | 1999-11-23 | 1999-11-23 | Shield for increasing color purity allowance at screen corner of color CRT and its design method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1297245A CN1297245A (en) | 2001-05-30 |
| CN1150588C true CN1150588C (en) | 2004-05-19 |
Family
ID=5282987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991237854A Expired - Fee Related CN1150588C (en) | 1999-11-23 | 1999-11-23 | Shield for increasing color purity allowance at screen corner of color CRT and its design method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1150588C (en) |
-
1999
- 1999-11-23 CN CNB991237854A patent/CN1150588C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1297245A (en) | 2001-05-30 |
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Granted publication date: 20040519 Termination date: 20121123 |