CN1427441A - Plane-type colour cathode-ray tube - Google Patents

Abstract

In plane color cathode ray tubes, the contrast of screen can be advanced and the steps for producing can be reduced using the raster of the tincture glass or dark tincture glass, in other word, it has advantage of reducing conventional coating step. By optimizing level pitch and transmissivity of shadow mask and transmissivity of screen, the problem can be solved that the brightness balance of the perimeter zone of the screen deteriorates due to the transmissivity difference of glass, which can ensure the resistance to impact and microphony characteristics of the aperture mask. In addition, the brightness balance and quality of the perimeter zone of the screen can be advanced by improving the transmissivity of the perimeter zone of shadow mask and transmissivity of the screen.

Description

Plane-type colour cathode-ray tube

Invention field

The present invention relates to a kind of plane-type colour cathode-ray tube, and relate in particular to a kind of like this plane-type colour cathode-ray tube, it can worsen and utilize tone glass panel or the low key tone glass panel that does not need traditional coating step to handle by the luminance balance that solves the screen periphery that is caused by glass transmission difference, come optimum level pitch and shadow mask passthrough rating and screen transmitance, improve the contrast-response characteristic of screen and reduce manufacturing step.

Background technology

Usually, as shown in Figure 1, in a kind of color cathode ray tube, the front glass that is called panel 10 combines with the rear part glass that is called funnel 20, and makes it be in high vacuum state their sealings.

And this color cathode ray tube comprises: face 40, and it is coated in panel 10 inner surfaces, and fulfils the function of luminescent material; Electron gun 130, its emission are used to shine the electron beam 60 of face 40; Shadow mask 70, it is used to make electronics beam from electron gun 130 in certain zone of face 40; Framework 30, it is used for fixing/supports shadow mask 70; Spring 80 and stud pin 120, it is used for frame unit 30 and panel 10 are combined; And inner shield 90, its certain surface with framework 30 combines and extends from panel one lateral funnels one side, is not subjected to influence of geomagnetic during in order to the work of protection cathode ray tube.

And, electron gun 130 is installed on the inner surface of neck 140 of funnel 20, deflection yoke 50 is installed on the outer surface of funnel 20 necks 140, in order to the electron beam 60 deflection certain orientations that electron gun 130 is produced, and CPM (assemble with colorimetric purity magnet ring) 100 is installed in the cathode ray tube, is used for accurately adjusting the yawing moment of electron beam 60.

And, not influenced by the damage of atmospheric pressure and external impact in order to protect panel 10 and funnel 20, reinforcing band 110 is installed in the exterior periphery of the built-up section of panel 10 and funnel 20.

At this moment, the electron beam that the electron gun 130 of funnel 20 necks 140 produces is mapped on the face 40 that is coated in panel 10 inner surfaces by the positive voltage that is applied on the cathode ray tube, here electron beam 60 is before it arrives face 40, under the effect that is formed on the deflection yoke 50 on funnel 20 outer surfaces upwards, deflection downwards, left and to the right.

And, because CPM (assembling and the colorimetric purity magnet ring) 100 has 2,4,6 magnetic poles, be used to change the electron beam orbit so that make it accurately arrive the target fluorescence area, so can prevent the colorimetric purity defective.

In addition, in order to improve contrast-response characteristic, particular dye can be coated on panel 10 outer surfaces.

Shadow mask 70 has domed shape, keeps specific range with panel 10 inner surfaces, and as shown in Figure 2, it comprises: active surface 71, and it has a plurality of circles that are positioned at the central area or the perforate 74 of strip: neighboring area 72, it is around active surface 71; And shadow mask shirt rim 73, its marginal portion by neighboring area 72 almost is bent to form perpendicular to neighboring area 72.

In addition, shadow mask 70 thickness are 0.1～0.3mm.

And, in the active surface 71 of shadow mask 70, form a plurality of lines of rabbet joint 74 as electron beam through-hole with certain arrangement mode, more specifically, the perforate 74 of circle or strip is arranged as multirow or multiple row, has the particular sections distance on vertical direction or horizontal direction.

For example, suppose that it is strips that electron beam passes hole 74, as shown in Figure 3, each line of rabbet joint 74 on the active surface 71 of shadow mask 70 all has a rectangle, it has width (Sw) and height (Sh), be provided with bridge (Br) between two lines of rabbet joint in vertical direction, normal pitch (Pv) is meant on the vertical direction distance between two lines of rabbet joint, and horizontal pitch (Ph) is meant on the horizontal direction distance between two lines of rabbet joint.

Here, change along with the incurvature radius of panel 10, keep the radius of curvature of the shadow mask 70 of certain distance also changing with panel 10 inner surfaces, thereby be used for determining that the change of shadow mask 70 horizontal pitchs (Ph) and panel 10 incurvature radiuses of the shape of shadow mask 70 has relation.

In traditional color cathode ray tube, electron beam 60 is penetrated by the electron gun 130 that is installed in funnel 20 ends, under the effect of the deflection yoke 50 that is installed in funnel 20 outer surfaces, electron beam 60 made progress before the face 40 of its arrival shadow mask 70, deflection downwards, left and to the right, electron beam 60 passes the shadow mask 70 with a plurality of perforates, be mapped on the face 40 that is formed on panel 10 inner surfaces and luminous, reproduced picture thus.

More specifically, three-beam electron-beam 60 according to signal specific under the effect of deflection yoke 50 upwards, deflection downwards, left and to the right, the electron beam that passes on the shadow mask 70 passes the hole, is mapped to R, G, B (red, green, blue) face 40 and sends R, G, B (red, green, blue) light on panel 10 inner surfaces.The combination of R, the G of picture by sending, three kinds of light of B (red, green, blue) is passed the panel 10 with certain thickness glass quality and is presented in spectators' the range of vision.Here, because fluorescence (brightness) difference can appear in transmissivity, the transmissivity (being referred to as hereinafter, " screen transmissivity ") of panel 10 faces and the glass transmissivity of panel 10 of shadow mask 70.

At this moment, determine the contrast of the picture that shows by above-mentioned steps according to the contrast difference.

In order to improve contrast-response characteristic, on panel 10 outer surfaces, apply particular dye.

After the coating, compare with skipping the screen that coating step handles, the dark areas on the screen (carrying out coating step handles) is darker and bright area is brighter, thereby has improved contrast-response characteristic.

At this moment, Fig. 4 A and 4B explanation has the panel 11 of incurvature radius and outer curvature radius simultaneously and has the shape of the plane panel 12 of outer curvature radius hardly.

Usually, the wedge rate refers to the ratio that the neighboring area thickness of glass of panel is compared with the central area thickness of glass, and shown in Fig. 4 B, the outer surface of panel is smooth more, and the wedge rate is big more.

More specifically, the inner surface of panel has the vaulted curved surface of certain curvature radius, and the outer surface of panel is similar to the plane, thereby the neighboring area of panel is thick more, and the glass wedge rate increases manyly more.

In addition, the outer surface of panel is plane (having outer curvature radius hardly), and the inner surface of panel has radius of curvature, thereby panel is thin more, and the glass transmissivity reduces fewly more.

Therefore, panel must use the clear glass with high-transmission rate as its manufacturing materials.

If like that, can improve fluorescence (brightness) characteristic, but mean that the contrast-response characteristic of the difference different with screen intensity has worsened, in order to remedy contrast-response characteristic, the coating transmissivity is 60%～80% black dyes on the outer surface of panel.

By applying, make dark areas darker, can improve contrast-response characteristic.But, this means and to carry out an additional coating step, and normally unwanted for this step of non-planar color cathode ray tube, thereby variety of problems has appearred, reduce such as additional manufacturing expense, difficulty and productivity ratio that the manufacturing step that increases is managed.

In order to address the above problem and to improve contrast-response characteristic, produced a kind of plane-type colour cathode-ray tube that utilizes the panel of tone glass or the manufacturing of low key tone glass.

But, by the clear glass manufacturing and have in the conventional planar type color cathode ray tube of 200% wedge rate, as shown in table 1, be 12.5mm and have in the panel of 200% wedge rate at a central area thickness, the transmissivity of clear glass central area be 80% and the transmissivity of neighboring area be 70%, and the transmissivity in tone center of glass zone be 51% and the transmissivity of neighboring area be 27%.Here, in this tone glass, the transmissivity of neighboring area is compared sharply with the transmissivity of central area and is reduced, thereby the non-constant of the luminance balance between neighboring area and the central area.

[table 1]

	Central area (%)	Neighboring area (%)
			Clear glass	????80	??????70
Tone glass	????51	??????27
			Low key tone glass	????40	??????18

As shown in table 1, the electron beam 60 that electron gun 130 sends passes the perforate 74 of shadow mask 70, and here the transmissivity of shadow mask 70 is about 14%～19%.

And the electron beam 60 that passes shadow mask 70 passes the face 40 that is coated on panel 10 inner surfaces, and the screen transmissivity is about 45%～60%.

And electron beam 60 passes the panel 10 that has certain thickness and make of glass material, arrives spectators' range of vision at last.

Therefore, in order to solve, wedge rate (referring to the ratio that the neighboring area thickness of glass of panel is compared with the central area thickness of glass) is kept to 180%～190% from 200% by sharply the descend luminance balance deterioration problem that causes and of neighboring area transmissivity simultaneously in order to reduce the spoilage in the heat treatment step.

More specifically, by reducing the thickness of glass of neighboring area, improve the transmissivity in glass periphery zone.

But, as mentioned above, by reducing the wedge rate, the inner surface of panel 10 becomes flat, in other words, radius of curvature has diminished, and is vaulted and keep the radius of curvature of the shadow mask 70 of certain distance to be associated with the change of the incurvature radius of panel 10 with the inner surface of panel 10.

Thereby, because the incurvature radius of panel 10 is to determine the principal element of microphony characteristic according to shadow mask 70 rigidities of structure, anti-internal impact characteristic and anti-external impact characteristic, so can not unrestrictedly reduce the wedge rate of panel 10.

Usually, when the horizontal pitch (Ph) of shadow mask increased, the radius of curvature of shadow mask 70 reduced, and when the horizontal pitch (Ph) of shadow mask when reducing, the radius of curvature of shadow mask 70 increases.Thereby the radius of curvature of shadow mask 70 is inversely proportional to the horizontal pitch (Ph) of shadow mask 70.

Thereby, in order to increase the radius of curvature of panel 10, have to increase the radius of curvature of shadow mask 70, this moment, horizontal pitch (Ph) structure of shadow mask 70 also had to change.More specifically, new structure must be able to make the deterioration of radius of curvature minimize and improve the transmissivity of shadow mask 70.

More specifically, as shown in table 1, when using tone glass or low key tone glass, the transmissivity of neighboring area sharply descends, in order to improve it, can reduce the wedge rate, but the wedge rate is reduced to exist a restriction, thereby only can not fully improve the transmissivity of the reduction of neighboring area with the method that reduces the glass wedge rate.

Summary of the invention

Therefore, in order to improve the problems referred to above, the purpose of this invention is to provide a kind of plane-type colour cathode-ray tube, it can solve the problem that worsens at screen neighboring area luminance balance, and this problem is to utilize tone glass panel or low key tone glass panel so that caused by the transmission difference according to the glass wedge rate under the situation of raising contrast-response characteristic.

In order to achieve the above object, in a kind of plane-type colour cathode-ray tube, comprise: rectangle panel, the inner surface that it has the outer surface that is roughly the plane and has the certain curvature radius; Funnel, it is installed in the back of panel; The face, it is coated in the inner surface of panel and fulfils certain lighting function; Electron gun, its emission is used to shine the electron beam of face; Shadow mask, it is used to make electronics beam from electron gun in certain zone of face; Framework, it is used for fixing/supports shadow mask; Spring and stud pin, it is used for frame unit and panel are combined; Inner shield, it combines with the certain surface of framework and extends from panel one lateral funnels one side, is not subjected to influence of geomagnetic during in order to the work of protection cathode ray tube; Electron gun, it is positioned at the funnel neck and produces electron beam; Deflection yoke, it is installed in the outer surface of funnel neck, in order to will be from the electron beam deflecting certain orientation of electron gun; CPM (assembling and the colorimetric purity magnet ring), it is used for accurately adjusting the yawing moment of electron beam; And reinforcing band, attach it to the neighboring of panel and funnel junction, avoid the influence of air pressure and external impact in order to protection panel and funnel, wherein plane-type colour cathode-ray tube is satisfied

1.2≤Ph _H/Ph _C≤1.6

1.2≤Ph _D/Ph _C≤1.6

This moment, the central area glass transmissivity of panel was about 45%～75%, the diagonal radius of curvature (Rp of panel _D) have a scope 3.5R≤Rp _D≤ 8.0R (R by the active surface diagonal angle axial length with panel multiply by 1.767 calculate get), the horizontal pitch that the electron beam that is positioned at the shadow mask central area passes the hole is Ph _C, the horizontal pitch that the electron beam of the ragged edge on long axis direction passes the hole is Ph _H, the horizontal pitch that the electron beam of the ragged edge on short-axis direction passes the hole is Ph _V, be Ph and the electron beam of the ragged edge on the diagonal axis direction passes the horizontal pitch in hole _D

In addition, in a kind of plane-type colour cathode-ray tube, comprise: rectangle panel, the inner surface that it has the outer surface that is roughly the plane and has the certain curvature radius; Funnel, it is installed in the back of panel; The face, it is coated in the inner surface of panel and fulfils specific lighting function; Electron gun, its emission is used to shine the electron beam of face; Shadow mask, it is used to make electronics beam from electron gun in certain zone of face; Framework, it is used for fixing/supports shadow mask; Spring and stud pin, it is used for frame unit and panel are combined; Inner shield, it combines with the certain surface of framework and extends from panel one lateral funnels one side, is not subjected to influence of geomagnetic during in order to the work of protection cathode ray tube; Electron gun, it is positioned at the funnel neck and produces electron beam; Deflection yoke, it is installed in the outer surface of funnel neck, in order to will be from the electron beam deflecting certain orientation of electron gun; CPM (assembling and the colorimetric purity magnet ring), it is used for accurately adjusting the yawing moment of electron beam; And reinforcing band, attach it to the neighboring of panel and funnel junction, avoid the influence of air pressure and external impact in order to protection panel and funnel, wherein plane-type colour cathode-ray tube is satisfied

0.80≤Ts _D/Ts _C≤1.20

This moment, the central area glass transmissivity of panel was about 45%～75%, the diagonal radius of curvature (Rp of panel _D) be positioned at scope 3.5R≤Rp _DIn≤the 8.0R (R multiply by 1.767 calculating by the active surface diagonal angle axial length with panel and gets), the peripheral part screen transmissivity of the active surface of panel is Ts _D, and core screen transmissivity is Ts _C

Brief description of the drawings

Graphic extension embodiments of the invention and be used to explain principle of the present invention in conjunction with explanatory note provide in conjunction with the accompanying drawings further explanation of the present invention, and accompanying drawing are provided and constitute the part of this specification.

In the accompanying drawings:

Fig. 1 is the cutaway view of the common cathode ray tube of explanation;

Fig. 2 is the perspective view of explanation shade mask structure;

Fig. 3 is that electron beam passes the perspective view of the structure in hole on the explanation shadow mask;

Fig. 4 A is the perspective view of the shape of explanation non-planar panel;

Fig. 4 B is the perspective view of the shape of illustrated planar type panel;

Fig. 5 is the exemplary view of the radius of curvature on major axis, minor axis and the diagonal axis direction of explanation panel and shadow mask;

Fig. 6 is the shadow mask radius of curvature of explanation certain limit and the curve chart of maximum applied shock amount (limit buckles);

Fig. 7 has illustrated the structure that is coated in the face on the panel inner surface;

Fig. 8 A is that explanation is coated in the face on the panel inner surface and the zoomed-in view of electron beam;

Fig. 8 B is the perspective view of the example of explanation purity nargin;

Fig. 8 C be explanation in the active surface the central area and the perspective view of neighboring area; And

Fig. 9 is the partial sectional view of explanation according to plane-type colour cathode-ray tube of the present invention.

Preferred embodiment is described in detail

Hereinafter, the preferred embodiments of the present invention will be described in conjunction with the accompanying drawings.

Usually, when tone glass or low key tone glass are used for plane-type colour cathode-ray tube,, make luminance balance (center: periphery) worsen because the transmissivity of neighboring area sharply descends.

As mentioned above, the electron beam that electron gun electrons emitted bundle passes shadow mask passes the hole, is about 14%～19% in the transmissivity of this shadow mask.The electron beam that passes shadow mask passes the face that is coated on the panel inner surface, is about 45%～60% in this shadow mask transmissivity.At last, electron beam passes the range of vision that arrives spectators with the panel of glass material making, has 27%～50% glass transmissivity (as shown in table 1) at this tone glass.

In passing the process of above-mentioned part, luminance balance has worsened, and the transmissivity of neighboring area is always less than the transmissivity of central area.

Therefore,, in conventional art, utilize a kind of method that reduces the glass wedge rate, but it can cause the microphonic characteristic of the reduction of the rigidity of structure owing to shadow mask, anti-internal impact characteristic and anti-external impact characteristic to reduce in order to remedy it.

Therefore, provide a kind of like this structure, its neighboring area at shadow mask has high-transmission rate, and has guaranteed the stiffness characteristics of shadow mask, and the neighboring area of screen has high-transmission rate, and described screen is made of black matrix" and fluorescence band as the face.

, must consider purity nargin to the horizontal pitch of shadow mask and the optimization of phosphor strip bandwidth here, wherein electron beam is not mapped to the fluorescence band that still has been mapped to other on the target fluorescence band.

More specifically, in traditional plane-type colour cathode-ray tube, use the clear glass panel, when using tone glass panel or low key tone glass panel, horizontal pitch of CRT aperture mask that will be optimized and screen transmissivity, be used to solve the problem that the luminance balance of screen neighboring area worsens, this question attribution is in the glass transmission difference.

Use plane-type colour cathode-ray tube of the present invention and comprise a rectangle panel and a shadow mask, the outer surface of described rectangle panel is roughly the plane, its diagonal radius of curvature (Rp _D) scope is 3.5R≤Rp _D≤ 8.0R, and central area glass transmissivity is 45%～60%, and described shadow mask has a plurality of electron beams and passes the hole, is formed at certain intervals on the inner surface of panel.

Especially, preferably the present invention is applied to large-sized plane-type colour cathode-ray tube that catercorner length is not less than 55cm.

The radius of curvature of shadow mask is at first described.

Usually, keep a determining deviation with the inner surface of panel and for the radius of curvature of the vaulted shadow mask incurvature radius according to panel changes, more specifically, the stiffness characteristics of shadow mask is subjected to the influence of the radius of curvature of shadow mask.

Below table 2 and Fig. 5 the relation of limit buckles and shadow mask radius of curvature is described.

[table 2]

Radius of curvature R m D(R)	Limit buckles (G)
		?????2.21	????19
?????2.12	????20
		?????2.04	????21
?????1.97	????22
		?????1.90	????23

In the curve chart of table 2 and Fig. 5, when shadow mask has radius of curvature on certain diagonal angle axis direction, the microphonic characteristic that can keep shadow mask and the maximum external impact amount of anti-internal impact characteristic have been described, here G is the unit of buckles, limit buckles is big more, and the recruitment of shadow mask rigidity also must be big more.In order to realize it, the radius of curvature of shadow mask must be very little.

In 29 inches traditional plane-type colour cathode-ray tubes, before the external impact amount reaches about 20～21G, shadow mask is less than having only the very little dispersion phenomenon owing to impact on deformation that causes because of impact and the screen, therefore common plane-type colour cathode-ray tube has to have a minimum to be not less than the limit buckles of 20G, so that satisfy the internal impact rigidity and the requirement of microphonic characteristic owing to external impact of shadow mask.

Therefore, shown in experimental data in the table 2, when the axial radius of curvature in shadow mask diagonal angle was not more than 2.12R, limit buckles was not less than 20G.

Therefore, when external impact was not less than 20G, the radius of curvature of shadow mask must guarantee not change owing to the screen characteristic of shadow mask deformation or microphonic.

Therefore, the axial radius of curvature R m in shadow mask diagonal angle _DBe not more than 2.1R.

In addition, the radius of curvature of short-axis direction is more littler than the axial radius of curvature of long axis direction or diagonal angle, and shadow mask is just stable more, when the radius of curvature of shadow mask long axis direction is Rm _H, the shadow mask short-axis direction radius of curvature be Rm _V, and the axial radius of curvature in shadow mask diagonal angle is Rm _DThe time, shadow mask satisfies Rm _V≤ Rm _D≤ Rm _H

Fig. 6 is the exemplary view of the radius of curvature of explanation shadow mask on major axis, minor axis and diagonal axis direction.

The electron beam transmissivity of shadow mask 70 neighboring areas will be described below.

At first, as shown in table 1 for use central area glass transmissivity in plane-type colour cathode-ray tube is 45%～75% tone glass or low key tone glass, must remedy the reduction of the transmissivity of panel neighboring area.

Therefore, the wedge rate that is used for the glass of conventional transparent glass panel is about 200%, only makes less than 170%～200% by reducing the wedge rate when using tone glass or low key tone glass panel, is difficult to make it to have the brightness quality identical with traditional neighboring area.

In order to address the above problem, preferably increase the transmissivity of neighboring area.More preferably be when increasing the neighboring area transmissivity, to increase the screen transmissivity.

As shown in Figure 4, the shadow mask transmissivity is to multiply by electron beam that vertical height (Sh) calculates with horizontal pitch (Sw) to pass hole area and the ratio that multiply by the shadow mask area that normal pitch (PV) calculates with horizontal pitch (Ph).

Usually, two kinds of methods that improve the shadow mask transmissivity are arranged, a kind of method is to increase the area that each electron beam passes the hole when increasing shadow mask neighboring area horizontal pitch, and another method is to reduce or keeping increasing the area that each electron beam passes the hole in the horizontal pitch of shadow mask neighboring area.

But for a kind of method in back, when horizontal pitch of CRT aperture mask reduced, the radius of curvature of shadow mask increased (shadow mask is more flat), can not get enough rigidity, a kind of method before therefore more preferably being to use.

Therefore, by increasing the horizontal pitch value of shadow mask neighboring area, can improve the transmissivity of shadow mask neighboring area.

In addition, increase ratio, can improve the transmissivity of shadow mask by increasing the horizontal pitch of comparing with the central area shadow mask neighboring area.

More specifically, to pass the horizontal pitch in hole be Ph to shadow mask central area electron beam _C, the horizontal pitch that the electron beam of the ragged edge on long axis direction passes the hole is Ph _H, the horizontal pitch that the electron beam of the ragged edge on short-axis direction passes the hole is Ph _V, the horizontal pitch that the electron beam of the ragged edge on the diagonal axis direction passes the hole is Ph _D, this shadow mask satisfies 0.67mm≤Ph _C≤ 0.8mm, 1.2≤Ph _H/ Ph _C≤ 1.6 and 1.2≤Ph _D/ Ph _C≤ 1.6.

But, horizontal pitch (Ph when shadow mask 70 central areas _C) when being not more than 0.67mm, shown in Fig. 8 A and 8B, the width of black matrix" 41, band 42 and purity nargin (PM) etc. has all reduced, so productivity ratio descends rapidly.For the central area horizontal pitch be 0.67mm 32 " plane-type colour cathode-ray tube, its productivity ratio and 25 " with 29 " plane-type colour cathode-ray tube is compared and has been reduced about 7～10%.

Following table 3 has been described shadow mask central area normal pitch (Ph _C) and the horizontal pitch of the ragged edge on the diagonal axis direction of shadow mask be Ph _D

[table 3]

	??Ph C(mm)	???Ph C(mm)	???Ph D/Ph C
				????25″	????0.78	????10.32	????1.32
????28″	????0.74	????0.999	????1.35
				????29″	????0.75	????0.970	????1.29
????32″	????0.67	????0.898	????1.30

Therefore, as shown in table 3, in conventional art, horizontal pitch on the diagonal axis direction or on long axis direction is 1.3 with the horizontal pitch of central area horizontal pitch than approximately, as 0.67mm≤Ph _C≤ 0.8mm, Ph _H/ Ph _C〉=1.6 and Ph _D/ Ph _C〉=1.6 o'clock, the central area horizontal pitch increased, and the definition of screen sharply descends, so Ph _H/ Ph _CWith Ph _D/ Ph _CValue must be not more than 1.6.

And if the horizontal pitch of shadow mask increases, then radius of curvature reduces, if the horizontal pitch of shadow mask reduces, then radius of curvature increases, and works as Ph _H/ Ph _CWith Ph _D/ Ph _CBe not more than at 1.2 o'clock, the horizontal pitch of neighboring area is more little, and then the shadow mask radius of curvature increases just manyly more.Under the sort of situation, radius of curvature is not less than 2.1R, therefore can not guarantee the stiffness characteristics of shadow mask.

Therefore, the horizontal pitch of the neighboring area of shadow mask must be not less than 1.2.

In Fig. 8 A, the Reference numeral of note (a) is not the invisible zone that black matrix" blocks electron beam, (b) is the luminosity zone that electron beam is mapped to target region, and (c) is the size of electron beam.

Next,, compare the horizontal pitch that must increase the neighboring area with conventional art, and each electron beam that must increase shadow mask simultaneously passes the area in hole in order to improve the transmissivity of shadow mask.

In the present invention, the shadow mask transmissivity is to multiply by electron beam that vertical height (Sh) calculates with horizontal pitch (Sw) to pass hole area and the ratio that multiply by the shadow mask area that normal pitch (Pv) calculates with horizontal pitch (Ph), this moment, the shadow mask transmissivity was Tm, and the transmissivity of shadow mask central area is Tm _C, and the transmissivity of shadow mask neighboring area is Tm _D, Tm _DSatisfy 10%～20%, transmissivity compares Tm _D/ Tm _CSatisfy 0.85≤Tm _D/ Tm _C≤ 0.90.

But, the size of passing the horizontal pitch of hole area and shadow mask and normal pitch when electron beam is compared when excessive, then the size of electron beam has increased, more specifically, shown in Fig. 8 A and 8B, to pass the electron beam dimensions in hole too big because pass electron beam, and then electron beam has been mapped on other face that exceeds the target face.

Here, purity nargin refers to that R, G, three kinds of electron beams of B are mapped to the tolerance limit before other face outside the target face, preferably determines transmissivity by adjusting the area that electron beam passes the hole on the basis of considering purity nargin.

Following table 4 has been described the relation of central area transmissivity and neighboring area transmissivity and screen inch size.

[table 4]

	Central area (%)	Neighboring area (%)
			????25″	??????18.9	?????15.7
????28″	??????17.1	?????14.2
			????29″	??????17.6	?????15.2
????32″	??????18.1	?????14.7

As shown in table 4, usually, the transmissivity of traditional plane-type colour cathode-ray tube is about 15%, when it exceeds 20%, the size that electron beam passes the hole increases, increase and to cause purity nargin to reduce owing to passing size that electron beam passes the electron beam in hole, many purity nargin defectives therefore when the plane-type colour cathode-ray tube image reconstruction, can occur.

Therefore, preferably make the transmissivity of shadow mask be not more than 20%.

For Tm _D/ Tm _C(neighboring area transmissivity/central area transmissivity) is 0.81～0.86 in the conventional art, is 0.85～0.90 by improving the neighboring area transmissivity with its increase preferably.

At this moment, 10%～20% the electron beam that penetrates of electron gun passes shadow mask and passes face 40 on the inner surface that is coated in panel.

In face 40, alternately be coated with the black matrix" 41 and the band 42 of sending out R, G, B light of electron beam 60.

Shown in Fig. 7 and Fig. 8 A, the portions of electronics Shu Yin that passes shadow mask is completely cut off by black matrix" 41 and can not pass panel 10, the portions of electronics beam is passed panel 10 to being coated in the band 42 on the panel inner surface with the form of light, be defined as screen transmissivity (Ts) with the transmissivity that light passes panel 10 this moment, and screen transmissivity (Ts) influences luminance balance.

When the screen active surface 13 of panel 10 is presented at the outer surface of panel 10, screen active surface 13 is formed by the black matrix" of representing with piece 41 with the band 42 that R, G, B fluorescent material are coated between the black matrix" 41, the width of screen transmissivity (Ts) finger band 42 and ratio with the summation of black matrix" width and strip width addition, in the present invention, be not less than 50% by the screen transmissivity that guarantees the neighboring area and can improve luminance balance.

But, when the screen transmissivity surpasses 60%, mean that strip width increases too much, on the contrary, the black matrix" width has reduced.Here, shown in Fig. 8 A and Fig. 8 B, because the electron beam that is completely cut off by black matrix" 41 is easy to be exposed by other face, purity nargin has reduced, so the screen transmissivity preferably is in 50%～60% scope.

Shown in Fig. 8 C, being positioned at the width at panel center and zone that length is 50mm is central area (CP), is neighboring area (DP) from the zone of active surface major axis edge 71 inside 50mm scopes, Ts _D/ Ts _C(the screen transmissivity of the screen transmissivity/central area of neighboring area) is 0.80～1.20, preferably improves the screen transmissivity of neighboring area.

Following table 5 has been described the strip width (BM in screen center zone _C) and the strip width (BM of neighboring area _D) with the relation of screen inch size.

[table 5]

	???BM C(mm)	????BM D(mm)	???BM D/BM C
				????25″	????0.180	????0.190	????1.06
????28″	????0.170	????0.190	????1.12
				????29″	????0.180	????0.187	????1.04

At black matrix" 41 and band 42, in the present invention, BM _D/ BM _CScope be set at 1.12～1.50, in other words, it is more that the width of band increases, and compares with the conventional art with 1.00～1.12 scopes, makes the neighboring area than at the more fluorescence of central area radiation.

Hereinafter, will application of the present invention be described in conjunction with 29 ＂ falt shape CRTs.

" in the falt shape CRT, the screen active surface catercorner length that panel has is 68cm, and the outer curvature radius that panel has is not less than 50, and 000R, the outer surface of panel are close to and are the plane, and the inner surface of panel has certain radius of curvature 29.

Here, wedge rate (neighboring area thickness of glass/central area thickness of glass) is 183%, using the central area transmissivity is 58% tone glass, and the shadow mask of installing have vaulted, keep having a plurality of electron beams to pass the hole on a determining deviation and its active surface with the inner surface of panel.

Radius of curvature (Rm on the long axis direction of shadow mask _H) be 2.3R, the radius of curvature on the short-axis direction is (Rm _V) be 2.0R, the radius of curvature on the diagonal axis direction is 2.05R.Therefore, under being not less than the situation of 20G (as shown in table 1), can satisfy the limit buckles rigidity and the requirement of microphonic characteristic of shadow mask.

More specifically, the shadow mask radius of curvature on the long axis direction, short-axis direction and the diagonal axis direction satisfies following formula.

Rm _D≤2.1R????------------------------(1)

Rm _V≤Rm _D≤Rm _H??--------------------(2)

In having the shadow mask of above-mentioned radius of curvature, pass the horizontal pitch (Ph in hole when shadow mask central area electron beam _C) be 0.720mm, the electron beam of the ragged edge on long axis direction passes the horizontal pitch (Ph in hole _H) be 1.029mm, the electron beam of the ragged edge on short-axis direction passes the horizontal pitch (Ph in hole _V) be the horizontal pitch (Ph that the electron beam of 0.710mm and the ragged edge on the diagonal axis direction passes the hole _D) when being 1.050mm, they satisfy following formula.

0.67mm≤Ph _C≤0.8mm??-------------(3)

1.2≤Ph _H/Ph _C≤1.5?--------------(4)

1.2≤Ph _D/Ph _C≤1.5?--------------(5)

0.9≤Ph _V/Ph _C≤1.1??----------------(6)

The central area transmissivity of shadow mask is 18.5%, and the neighboring area transmissivity of shadow mask is 16.0%.

In addition, the black matrix" width of central area is 103 μ m, and the phosphor strip bandwidth of central area is 150 μ m, and the black matrix" width of neighboring area is 185 μ m, and the phosphor strip bandwidth of neighboring area is 210 μ m.Therefore, BM _D/ BM _CBe about 1.40, its between scope 1.12～1.50, the screen transmissivity (Ts of neighboring area _D) be about 53%, the screen transmissivity (Ts of central area _C) be about 59%.

Here, Ts _D/ Ts _CValue be 0.90.

Usually, be about electron beam and pass 1.8 times of hole horizontal width (Sw) passing the size of electron beam that electron beam is mapped to the inner surface of panel after passing the hole, when the peripheral transmissivity of shadow mask is 16%, electron beam passes hole horizontal width (Sw) and is about 219 μ m, when passing electron beam that the electron beam with 16% transmissivity and 210 μ m horizontal widths (Sw) passes the hole and arrive the inner surface of panel, the size of electron beam is about 395 μ m.

As neighboring area screen transmissivity (Ts _D) be about at 60% o'clock, shown in Fig. 8 B, the black matrix" width of neighboring area is about 160 μ m, and the strip width of neighboring area is about 235 μ m.

Here, colorimetric purity nargin is 80 μ m, when it is not more than 80 μ m, to 32, and " situation is similar, because color purity nargin has reduced, so the chromatic dispersion defective can occur and reduce productivity ratio.

Following table 6 has been described the neighboring area transmissivity (Ts of panel _D) and central area transmissivity (Ts _C) ratio with the inch relation.

[table 6]

	???Ts D/Ts C	????Ts D(％)	????Ts D(％)
				????25″	?????0.73	????47	????64
????28″	?????0.75	????49	????65
				????29″	?????0.75	????51	????68
????32″	?????0.78	????47	????60

For the screen transmissivity in the conventional art, neighboring area screen transmissivity generally is not more than 50%, BM _D/ BM _C(neighboring area strip width/central area strip width) generally is not more than 1.10.

Therefore, neighboring area screen transmissivity (Ts _D) be 50%～60%, BM _D/ BM _CScope satisfy 1.12≤BM _D/ BM _C≤ 1.50.

For traditional use tone glass 29 " plane-type colour cathode-ray tube and use product of the present invention, will to following some describe: the electron beam of the ragged edge on the diagonal axis direction of shadow mask passes the horizontal pitch (Ph in hole _D) and central area horizontal pitch (Ph _C) ratio, the neighboring area transmissivity (Tm of shadow mask _D), the neighboring area strip width (BM of screen _D) and central area strip width (BM _C) ratio, the neighboring area screen transmissivity (Ts of screen _D) and luminance balance (B/U).

[table 7]

	Conventional art	The present invention
			????Ph D/Ph C	????1.3	????1.46
????Tm D	????15.7％	????16.0％
			????BM D/BM C	????1.06	????1.40
????Ts D	????46％	????53％
			????B/U	????45％	????52％

The electron beam 60 that electron gun 130 penetrates arrives spectators' range of vision after the electron beam that passes shadow mask passes hole 74, face 40 (being made up of black matrix" 41 and band 42) and tone glass panel 10.

Here, the luminance balance of describing neighboring area brightness and central area brightness ratio is B/U, and the B/U value is high more, and luminance balance improves just manyly more.

Therefore, as shown in table 7, by increasing Ph as horizontal pitch of CRT aperture mask ratio _D/ Ph _CValue, neighboring area shadow mask transmissivity (Tm _D) and neighboring area screen transmissivity, luminance balance of the present invention exceeds 7% than traditional plane-type colour cathode-ray tube approximately.

Fig. 9 is the partial sectional view of explanation according to plane-type colour cathode-ray tube of the present invention (1000).

As mentioned above, utilize the panel of tone glass or low key tone glass to have the advantage that reduces manufacturing step, the shadow mask that has the radius of curvature that can guarantee anti-interior impact and microphonic characteristic by use, and, can improve contrast-response characteristic, luminance balance and the quality of screen by the neighboring area transmissivity of raising shadow mask and the neighboring area transmissivity of screen.

Only otherwise deviate from spirit of the present invention or essential characteristic, the present invention can be specifically embodied as various form, can also understand like this, be not limited to aforementioned any details of the foregoing description, except as otherwise noted, make an explanation but should indeed work as briefly within its spirit described in additional claims and scope, and therefore fall in the claim scope change and revise, or the equivalent of this scope all should be included in the additional claim.

Claims (14)

1, a kind of plane-type colour cathode-ray tube, it comprises: rectangle panel, the inner surface that it has the outer surface that is roughly the plane and has the certain curvature radius; Funnel, it is installed in the back of panel; The face, it is coated in the inner surface of panel and fulfils the function of luminescent material; Electron gun, its emission is used to shine the electron beam of face; Shadow mask, it is used to make electronics beam from electron gun in certain zone of face; Framework, it is used for fixing/supports shadow mask; Spring and stud pin, it is used for frame unit and panel are combined; Inner shield, it combines with the certain surface of framework and extends from panel one lateral funnels one side, is not subjected to influence of geomagnetic during in order to the work of protection cathode ray tube; Electron gun, it is positioned at the funnel neck and produces electron beam; Deflection yoke, it is installed in the outer surface of funnel neck, in order to will be from the electron beam deflecting certain orientation of electron gun; CPM (assembling and the colorimetric purity magnet ring), it is used for accurately adjusting the yawing moment of electron beam; And reinforcing band, attach it to the neighboring of panel and funnel junction, avoid the influence of air pressure and external impact in order to protection panel and funnel, wherein plane-type colour cathode-ray tube is satisfied

1.2≤Ph _H/Ph _C≤1.6，

1.2≤Ph _D/Ph _C≤1.6

This moment, the central area glass transmissivity of panel was about 45%～75%, the diagonal radius of curvature (Rp of panel _D) have a scope 3.5R≤Rp _D≤ 8.0R (R by the active surface diagonal angle axial length with panel multiply by 1.767 calculate get), the horizontal pitch that the electron beam that is positioned at the shadow mask central area passes the hole is Ph _C, the horizontal pitch that the electron beam of the ragged edge on long axis direction passes the hole is Ph _H, the horizontal pitch that the electron beam of the ragged edge on short-axis direction passes the hole is Ph _V, be Ph and the electron beam of the ragged edge on the diagonal axis direction passes the horizontal pitch in hole _D

2, plane-type colour cathode-ray tube as claimed in claim 1, wherein the catercorner length of the screen active surface of panel is 55cm.

3, plane-type colour cathode-ray tube as claimed in claim 1, the electron beam that wherein is positioned at the shadow mask central area passes the horizontal pitch (Ph in hole _C) satisfy scope 0.67mm≤Ph _C≤ 0.8mm.

4, plane-type colour cathode-ray tube as claimed in claim 1, wherein shadow mask satisfies

0.9≤Ph _V/Ph _C≤1.1

This moment the electron beam of ragged edge on short-axis direction to pass the horizontal pitch in hole be Ph _V, be Ph and the electron beam that is positioned at the shadow mask central area passes the horizontal pitch in hole _C

5, plane-type colour cathode-ray tube as claimed in claim 1, wherein the transmissivity of shadow mask satisfies

0.85≤Tm _D/Tm _C≤0.9

This moment, the transmissivity of shadow mask neighboring area was Tm _D, and the transmissivity of shadow mask central area is Tm _C

6, plane-type colour cathode-ray tube as claimed in claim 5, wherein shadow mask satisfies

10％≤Tm _D≤20％

This moment, the transmissivity of shadow mask neighboring area was Tm _D

7, plane-type colour cathode-ray tube as claimed in claim 1, wherein shadow mask satisfies

Rm _D≤2.1R，

Rm _V≤Rm _D≤Rm _H

Radius of curvature on the long axis direction of shadow mask is Rm at this moment _H, the radius of curvature on the short-axis direction of shadow mask is Rm _V, the radius of curvature on the diagonal axis direction of shadow mask is Rm _D

8, plane-type colour cathode-ray tube as claimed in claim 1, wherein panel satisfies

0.80≤Ts _D/Ts _C≤1.20

The screen transmissivity of the neighboring area of panel is Ts at this moment _D, and the screen transmissivity of the central area of panel is Ts _C

9, plane-type colour cathode-ray tube as claimed in claim 1, wherein the screen transmissivity of the neighboring area of panel is in 50%≤Ts _DAmong≤60% scope.

10, plane-type colour cathode-ray tube as claimed in claim 1, wherein panel satisfies

1.12≤BM _D/BM _C≤1.5

The neighboring area strip width of the active surface of panel is BM at this moment _D, and the central area strip width of the active surface of panel is BM _C

11, a kind of plane-type colour cathode-ray tube, it comprises: rectangle panel, the inner surface that it has the outer surface that is roughly the plane and has the certain curvature radius; Funnel, it is installed in the back of panel; The face, it is coated in the inner surface of panel and fulfils the function of luminescent material; Electron gun, its emission is used to shine the electron beam of face; Shadow mask, it is used to make electronics beam from electron gun in certain zone of face; Framework, it is used for fixing/supports shadow mask; Spring and stud pin, it is used for frame unit and panel are combined; Inner shield, it combines with the certain surface of framework and extends from panel one lateral funnels one side, is not subjected to influence of geomagnetic during in order to the work of protection cathode ray tube; Electron gun, it is positioned at the funnel neck and produces electron beam; Deflection yoke, it is installed in the outer surface of funnel neck, in order to will be from the electron beam deflecting certain orientation of electron gun; CPM (assembling and the colorimetric purity magnet ring), it is used for accurately adjusting the yawing moment of electron beam; And reinforcing band, attach it to the neighboring of panel and funnel junction, avoid the influence of air pressure and external impact in order to protection panel and funnel, wherein plane-type colour cathode-ray tube is satisfied

0.80≤Ts _D/Ts _C≤1.20

This moment, the central area glass transmissivity of panel was about 45%～75%, the diagonal radius of curvature (Rp of panel _D) be positioned at scope 3.5R≤Rp _DIn≤the 8.0R (R multiply by 1.767 calculating by the active surface diagonal angle axial length with panel and gets), the peripheral part screen transmissivity of the active surface of panel is Ts _D, and core screen transmissivity is Ts _C

12, plane-type colour cathode-ray tube as claimed in claim 11, wherein the screen transmissivity (Ts of the neighboring area of panel _D) be in 50%≤Ts _DAmong≤60% scope.

13, plane-type colour cathode-ray tube as claimed in claim 11, wherein panel satisfies

1.12≤BM _D/BM _C≤1.5

The neighboring area strip width of the active surface of panel is BM at this moment _D, and the central area strip width of the active surface of panel is BM _C

14, plane-type colour cathode-ray tube as claimed in claim 11, wherein the catercorner length of the screen active surface of panel is 55cm.

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