CN1328750C

CN1328750C - Field emission display possessing sealing arrangement

Info

Publication number: CN1328750C
Application number: CNB02151934XA
Authority: CN
Inventors: 陈杰良
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2002-11-05
Filing date: 2002-11-05
Publication date: 2007-07-25
Anticipated expiration: 2022-11-05
Also published as: CN1499567A

Abstract

The present invention discloses a field emitting display with a sealing device, which solves the problem that the heat expanding coefficients of the components of a sealing device are different, and thus, the service life and the performance of a field emitting display are reduced. The field emitting display with a sealing device of the present invention comprises a cathode board, a buffering layer in contact with the cathode board, an electron emitting end formed on the buffering layer, an anode board coated by a fluorescent layer and opposite to the cathode board, and a sealing device, wherein the sealing device defines a sealed inner space, and the cathode board, the buffering layer, the electron emitting end and the anode board are accommodated in the inner space. The sealing device comprises a front panel, a rear panel and a side wall which is fixed in the inner space formed between the front panel and the rear panel. The front panel and the rear panel are made of glass material, and the side wall is made of the Fe-Ni-Co alloy of which the heat expanding coefficient is identical to that of the glass material.

Description

The Field Emission Display of tool sealing device

[technical field]

The invention relates to a kind of Field Emission Display, especially about a kind of sealing device of Field Emission Display.

[background technology]

Advantage fast developments such as the cathode-ray tube display that flat-panel screens is more traditional is in light weight because of having, little power consumption.The cold-cathode field emission display is a kind of of flat-panel screens.

Field Emission Display comprises front panel that forms display screen and the rear board with electron transmitting terminal.Field Emission Display adopts electron transmitting terminal emitting electrons bump fluorescent display screen to make it luminous and produce visual pattern.Rear board includes the circuit of the electronics emission that is used to control electron transmitting terminal.Electron transmitting terminal and this front panel be from forming the gap, for obtaining stable display effect, electron transmitting terminal need vacuum pressure less than the vacuum environment of 10-6 holder under emitting electrons.So Field Emission Display needs good vacuum seal to guarantee its inner vacuum environment.

For obtaining better vacuum environment, getter can be set in Field Emission Display to absorb residual gas.Please refer to Fig. 1, United States Patent (USP) the 5th, 688, No. 708 (day for announcing is on November 18th, 1997) discloses a kind of Field Emission Display 100, and it comprises: be covered with fluorescence coating 104 positive plate 102, have the minus plate 106 of a plurality of electron transmitting terminals 108 and be placed in minus plate 106 and positive plate 102 between sidewall 112.Adopt glass material sealant (not indicating) that sidewall 112 is fixed on minus plate 106 and the positive plate 102 to form sealing area.100 nearly steps of Field Emission Display comprise a plurality of host cavities that communicate with sealing area 118, and first, second getter 120,122 is contained in respectively in the different host cavity 118.First, second getter 120,122 can be absorbed the interior residual gas of sealing area to improve vacuum environment.Yet a plurality of host cavities 118 of Field Emission Display 100 tools make its volume bigger, and make it be installed to generation inconvenience in the system because of host cavity 118 outwards protrudes.In addition, thermal coefficient of expansion difference between glass material sealant, minus plate 106, positive plate 102 and the sidewall 112, long-term use meeting reduces by 100 useful lifes of Field Emission Display and reliability because of the variation of external temperature environment causes seal failure between minus plate 106, positive plate 102 and the sidewall 112.

[summary of the invention]

The object of the invention is to provide a kind of tool excellent sealing, reliability and the Field Emission Display of the tool sealing device in long useful life.

Another object of the present invention is to provide the sealing device of the Field Emission Display of a kind of tool excellent sealing, reliability.

For realizing the object of the invention, the Field Emission Display of tool sealing device of the present invention comprises: minus plate, the resilient coating that leans with minus plate, be formed at the electron transmitting terminal on the resilient coating, relative with this minus plate and be covered with the positive plate and the sealing device of fluorescence coating, the sealing device defines the inner space of a sealing, and minus plate, resilient coating, electron transmitting terminal and positive plate are contained in this inner space, the sealing device comprises front panel, rear board and sidewall, this sidewall is fixed in and forms this inner space between this front panel and the rear board, this front panel and rear board are made by glass material, and this sidewall is made by the teleoseal identical with the glass material thermal coefficient of expansion.The sealing device also comprises the inwall that depends on this sidewall and be arranged at this inner space, and this inwall is made by chromium-doped teleoseal.

Compared to prior art, the present invention has following advantage: because the front panel and the rear board of the sealing device of the Field Emission Display of tool sealing device of the present invention are made by glass material, and the employing teleoseal identical with the glass material thermal coefficient of expansion be as the sidewall of sealing device, and make it have good sealing property, reliability and long useful life.

[description of drawings]

Fig. 1 is the profile of prior art Field Emission Display.

Fig. 2 is the profile of the Field Emission Display of tool sealing device of the present invention.

[embodiment]

Please refer to shown in Figure 2, the Field Emission Display 1 of tool sealing device of the present invention comprise a positive plate 30 that is covered with fluorescence coating 40, one with fluorescence coating 40 from resilient coating 60, a plurality of be formed at electron transmitting terminal 50 on the resilient coating 60, one and resilient coating 60 against minus plate 70, one silicon membrane layers 80 and a sealing device 5.Sealing device 5 defines an inner space (not indicating), and positive plate 30, fluorescence coating 40, resilient coating 60, electron transmitting terminal 50, minus plate 70 and silicon membrane layer 80 are arranged in this inner space.

Sealing device 5 comprises front panel 10, rear board 20 and sidewall 90.Sidewall 90 is fixed between front panel 10 and the rear board 20 to form the inner space of sealing.Front panel 10 and rear board 20 can adopt the glass manufacturing.Sidewall 90 is made by teleoseal, and teleoseal iron content 54%, nickel 29% and cobalt 17%.The impure carbon of teleoseal is no more than 0.1%.Teleoseal intensity is very big, and its tension stress is 4430 kilograms/square centimeter, and compression is 3000 kilograms/square centimeter.Teleoseal is identical with the thermal coefficient of expansion of the glass material of making front panel 10, rear board 20.

Be the mechanical strength of enhancing sealing device 5 and the vacuum environment of inner space, sealing device 5 further comprises the inwall of being made by gettering material 92, inwall 92 is housed in the inner space and in abutting connection with sidewall 90, can be sealing device 5 better mechanical strength and stability are provided.Gettering material is chromium-doped teleoseal Cr _xKovar _1-x, wherein x is in 0.1 to 0.5 scope.Chromium can be absorbed the steam, oxygen, carbon dioxide and other gas that residue in the sealing device 5 to improve the vacuum degree of sealing device 5 inner spaces.

Positive plate 30 is the transparency electrodes that are formed at light-permeable on the front panel 10, and transparency electrode can adopt the tin indium oxide manufacturing.Minus plate 70 is made by electric conducting material, and silicon membrane layer 80 is formed on the rear board 20, between minus plate 70 and rear board 20, makes between minus plate 70 and the rear board 20 effectively to contact.When driving voltage put on positive plate 30 and the minus plate 70, electron transmitting terminal 5 emitting electrons impact fluorescence layers 40 were luminous.

During sealing device 5 sealings, inwall 92 depends on sidewall 90, and sidewall 90 is arranged between front panel 10 and the rear board 20, and sidewall 90 can adopt the glass-sealing agent sealing to form the inner space of sealing with front panel 10, rear board 20 contact zones.Sidewall 90 fusing points that teleoseal is made be higher than glass material make before the fusing point of panel 10 and rear board 20, also can make the inner space that contact area softens and then cementation forms sealing mutually of front panel 10, rear board 20 and sidewall 90 to front panel 10, rear board 20 and the heating of sidewall 90 contact areas.Inwall 92 can be absorbed the residual gas of inner space with gas clean-up, and inwall 92 also strengthens the intensity of sealing device 5.

Sidewall 90, front panel 10 and the identical thermal coefficient of expansion of rear board 20 tools, the not sealing between the variable effect sidewall 90 of heat that can produce because of fluorescence coating 40 and external temperature and front panel 10, the rear board 20 can be guaranteed the sealing and the reliability of sealing device 5.Sidewall 90 adopts bigger teleoseal and the inwall 92 of intensity to depend on sidewall 90, for front panel 10 and rear board 20 provide stronger support, can guarantee the stability of sealing device 5.Inwall 92 is made by gettering material, and gettering material can be absorbed the gas of the inner space that remains in sealing device 5, can improve the vacuum degree of inner space.Adopt flat-panel screens tool good sealing property, reliability and the long useful life of sealing device 5.

Claims

1. A field emission display with a sealing device, comprising: a cathode plate, a buffer layer against the cathode plate, an electron emission terminal formed on the buffer layer, an anode plate opposite to the cathode plate and covered with a fluorescent layer and a sealing device, the sealing device defines a sealed internal space, and the cathode plate, the buffer layer, the electron emission terminal and the anode plate are accommodated in the internal space, the sealing device includes a side wall, and it is characterized in that: the sealing device includes a A front panel made of glass material and a rear panel made of glass material, the side wall is fixed between the front panel and the rear panel to form the internal space, and the side wall is made of iron with the same thermal expansion coefficient as the glass material Made of nickel-cobalt alloy, the sealing device also includes an inner wall attached to the side wall and arranged in the inner space, the inner wall is made of iron-nickel-cobalt alloy doped with chromium.

2. The field emission display with a sealing device according to claim 1, wherein the iron-nickel-cobalt alloy contains 54% iron, 29% nickel and 17% cobalt.

3 . The field emission display with sealing device according to claim 2 , wherein the composition of the chromium-doped iron-nickel-cobalt alloy is Cr _x Kovar _1-x , wherein x is in the range of 0.1 to 0.5.

4. The field emission display with sealing device according to claim 2, wherein the Fe-Ni-Co alloy contains impurity carbon less than or equal to 0.1%.

5 . The field emission display with a sealing device according to claim 1 , wherein the areas where the front panel, the rear panel and the sidewalls are in contact with each other are adhered to each other by heating. 6 .

6. The field emission display with a sealing device as claimed in claim 1, wherein the areas where the front panel, the rear panel and the sidewalls are in contact are sealed by a glass sealant.

7. A sealing device for a field emission display, comprising: a side wall, characterized in that: the sealing device further includes a front panel and a rear panel made of glass material, and the side wall is fixed to the front panel and the rear panel A sealed inner space is formed between them, and the side wall is made of an iron-nickel-cobalt alloy having the same thermal expansion coefficient as the glass material, and the sealing device also includes an inner wall attached to the side wall and arranged in the inner space, and the inner wall is made of Made of iron-nickel-cobalt alloy doped with chromium.

8. The sealing device according to claim 7, characterized in that the iron-nickel-cobalt alloy contains 54% iron, 29% nickel and 17% cobalt.

9 . The sealing device according to claim 8 , wherein the composition of the chromium-doped iron-nickel-cobalt alloy is Cr _x Kovar _1-x , wherein x is in the range of 0.1 to 0.5.

10. The sealing device according to claim 9, characterized in that the iron-nickel-cobalt alloy contains impurity carbon less than or equal to 0.1%.