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WO2007017990A1 - Dispositif d’affichage - Google Patents

Dispositif d’affichage Download PDF

Info

Publication number
WO2007017990A1
WO2007017990A1 PCT/JP2006/312635 JP2006312635W WO2007017990A1 WO 2007017990 A1 WO2007017990 A1 WO 2007017990A1 JP 2006312635 W JP2006312635 W JP 2006312635W WO 2007017990 A1 WO2007017990 A1 WO 2007017990A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
spacer
resistance
film
front substrate
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.)
Ceased
Application number
PCT/JP2006/312635
Other languages
English (en)
Japanese (ja)
Inventor
Satoshi Ishikawa
Satoko Oyaizu
Ken Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of WO2007017990A1 publication Critical patent/WO2007017990A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/864—Spacers between faceplate and backplate of flat panel cathode ray tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/123—Flat display tubes
    • H01J31/125—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection
    • H01J31/127—Flat display tubes provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digital selection using large area or array sources, i.e. essentially a source for each pixel group
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2329/00—Electron emission display panels, e.g. field emission display panels
    • H01J2329/86—Vessels
    • H01J2329/8625—Spacing members
    • H01J2329/8645—Spacing members with coatings on the lateral surfaces thereof

Definitions

  • the present invention relates to a display device that displays a color image by emitting electrons from an electron-emitting device provided on a rear substrate and exciting a phosphor layer provided on the front substrate to emit light.
  • a liquid crystal display has been known as a display device having a vacuum envelope having a flat flat panel structure.
  • a display device (hereinafter referred to as SED) including a surface conduction electron-emitting device is being developed.
  • the SED has a front substrate and a rear substrate that are arranged to face each other with a predetermined gap.
  • These substrates are joined to each other at their peripheral portions via rectangular frame-shaped side walls, and the inside is evacuated to form a flat envelope having a flat panel structure.
  • a phosphor layer of three colors is formed on the inner surface of the front substrate, and on the inner surface of the rear substrate, a large number of electron-emitting devices corresponding to each pixel are used as an electron emission source for exciting and emitting the phosphor layer. Aligned. On the inner surface of the back substrate, a large number of wirings for driving the electron-emitting devices are provided in a matrix, and the end portions are drawn out of the vacuum envelope.
  • a plate-shaped grid is disposed between the front substrate and the rear substrate.
  • many beam passage holes are formed in a positional relationship aligned with the electron-emitting devices, and the gap between the substrates is maintained by contacting the inner surfaces of the front substrate and the rear substrate.
  • a plurality of columnar spacers are provided (for example, see Patent Document 1).
  • a method of suppressing the charging by covering the spacer with a high resistance material such as oxychrome chrome can be considered.
  • this type of high-resistance material has the property that the resistance changes when the temperature changes, so that when the front substrate having a phosphor layer becomes higher in temperature than the rear substrate due to electron beam irradiation, it is close to the front substrate.
  • the edge of the spacer on the side becomes hotter than the edge on the side close to the back substrate, and the resistance of the spacer film on the front substrate side and the back substrate side is different, which adversely affects the trajectory of the electron beam. Occurs.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2003-312818
  • An object of the present invention is to provide a display device capable of suppressing a change in trajectory of an electron beam with time and displaying a high-quality image.
  • a display device of the present invention includes a first substrate having an image display surface, and is disposed to face the image display surface of the first substrate with a gap between them.
  • a second substrate having a number of electron emission sources that emit electron beams that excite the light source, and abutting between the first and second substrates, and supporting an atmospheric pressure load acting on the first and second substrates
  • a spacer, and the spacer has a rate of change of resistance with respect to a change in temperature along the gap direction between the substrates.
  • the rate of change of resistance with respect to the temperature change of the spacer supporting the atmospheric pressure load acting on the first substrate and the second substrate is varied along the gap direction between the substrates. For this reason, even when the first substrate having the image display surface heated by the irradiation of the electron beam becomes hot compared to the second substrate, the spacer end portion closer to the first substrate It is possible to prevent the resistance from greatly differing from the end of the spacer near the second substrate, and to suppress adverse effects on the trajectory of the electron beam passing through the vicinity.
  • FIG. 1 is an external perspective view showing a vacuum envelope of an SED according to an embodiment of the present invention. is there.
  • FIG. 2 is a cross-sectional perspective view of the vacuum envelope of FIG. 1 cut along line II II.
  • FIG. 3 is a partially enlarged sectional view showing a partially enlarged section of FIG. 2.
  • FIG. 4 is a diagram for explaining a method of forming a spacer according to the first embodiment incorporated in the SED of FIG.
  • FIG. 5 is a diagram for explaining a film forming method according to a second embodiment.
  • FIG. 6 is a diagram for explaining a film forming method according to a third embodiment.
  • FIG. 1 is a perspective view showing the vacuum envelope 10 of the SED 1 with the front substrate 2 partially cut away, and FIG. 2 shows the vacuum envelope 10 of FIG. 1 at the position of line ⁇ - ⁇ .
  • FIG. 3 is a partially enlarged sectional view in which the section of FIG. 2 is partially enlarged.
  • the SED 1 is a front substrate 2 made of a rectangular glass plate.
  • the back substrate 4 has a size that is one size larger than the front substrate 2.
  • the front substrate 2 and the rear substrate 4 are joined to each other through a rectangular frame-shaped side wall 6 made of glass, and constitute a vacuum envelope 10 having a flat planar panel structure in which the inside is a vacuum.
  • a phosphor screen 12 that functions as an image display surface is formed on the inner surface of the front substrate 2.
  • the phosphor screen 12 is configured by arranging red, blue, and green phosphor layers R, G, and B, and a light shielding layer 11, and these phosphor layers are formed in a stripe shape or a dot shape. Further, on the phosphor screen 12, a metal back 14 having an aluminum thin film isotropic force is formed.
  • a type of electron-emitting device 16 is provided. These electron-emitting devices 16 They are arranged in multiple columns and multiple rows corresponding to each element, that is, for each of the phosphor layers R, G, and B. Each electron-emitting device 16 includes an electron emitting portion (not shown) and a pair of device electrodes for applying a voltage to the electron emitting portion. Further, on the inner surface of the back substrate 4, a large number of wirings 18 for applying a driving voltage to each electron-emitting device 16 are provided in a matrix shape, and the end portions thereof are drawn out of the vacuum envelope 10. Yes.
  • the side wall 6 functioning as a joining member is sealed to the peripheral portion of the front substrate 2 and the peripheral portion of the rear substrate 4 by a sealing material 19 such as low melting point glass or low melting point metal, for example.
  • a sealing material 19 such as low melting point glass or low melting point metal, for example.
  • the plates are joined together.
  • the back substrate 4 and the side wall 6 are bonded using frit glass 19a, and the front substrate 2 and the side wall 6 are bonded using indium 19b. If the back substrate 4 and the side wall 6 with the wiring 18 are sealed with a low melting point metal, it is necessary to provide an insulating layer as an intermediate layer in order to avoid an electrical short between the wiring 18 and the sealing material 19.
  • the SED 1 includes a plurality of columnar spacers 8 between the front substrate 2 and the rear substrate 4.
  • Each spacer 8 includes an upper end 8a that contacts the inner surface of the front substrate 2 through the metal back 14 and the light shielding layer 11 of the phosphor screen 12, and a wiring 18 provided on the inner surface of the rear substrate 4.
  • the lower end 8b is in contact with the front substrate 2 and functions to support an atmospheric pressure load acting on the outer force of the front substrate 2 and the rear substrate 4 and to maintain the distance between the substrates at a predetermined value.
  • the SED 1 includes a voltage supply unit (not shown) that applies an anode voltage between the metal back 14 of the front substrate 2 and the rear substrate 4.
  • the voltage supply unit sets the potential of the back substrate 4 to OV and applies an anode voltage between the two so that the potential of the metal back 14 is about 10 kV.
  • the SED 1 when an image is displayed, a voltage is applied between the element electrodes of the electron-emitting device 16 via a drive circuit (not shown) connected to the wiring 18, and the arbitrary electron-emitting device 16 The electron emission force also emits an electron beam, and an anode voltage is applied to the metal back 14. The electron beam emitted from the electron emitting portion is accelerated by the anode voltage and collides with the phosphor screen 12. As a result, the phosphor layers R, G, and B of the phosphor screen 12 are excited to emit light, and a color image is displayed.
  • phosphor screen 12 and metal are previously prepared.
  • a front substrate 2 provided with knocks 14 is prepared, and a rear substrate 4 provided with electron-emitting devices 16 and wirings 18 and with side walls 6 and spacers 8 bonded thereto is prepared.
  • the front substrate 2 and the rear substrate 4 are placed in a vacuum chamber (not shown), the inside of the vacuum chamber is evacuated, and then the front substrate 2 is joined to the rear substrate 4 via the side wall 6.
  • a vacuum chamber not shown
  • the front substrate 2 is heated to a relatively high temperature (about 50 ° C.) over time, The temperature near the upper end 8a of the spacer 8 on the front substrate 2 side is higher than that near the lower end 8b of the spacer 8 on the rear substrate 4 side.
  • a temperature distribution is generated in the spacer 8 along the gap direction between the substrates (the axial direction of the spacer 8)
  • a temperature distribution is also generated in the coated high resistance member.
  • this type of high resistance member has a property that the resistance changes when the temperature changes, if a temperature distribution is generated along the axial direction of the spacer 8 as described above, the resistance of the high resistance member is reduced. Distribution, and the resistance distribution of the high resistance member also changes the initial value force, adversely affects the trajectory of the electron beam passing near the spacer 8 and causes a shift in the landing position of the electron beam. Problems arise.
  • each spacer 8 when the front substrate 2 is heated with time and the temperature distribution along the axial direction of each spacer 8 is changed, it is emitted from each electron-emitting device 16.
  • the rate of change in resistance to the temperature change along the axial direction of each spacer 8 is different.
  • the rate of change of resistance a with respect to the temperature change of a specific substance is the temperature at the temperature T ° C of the substance. If the resistance value is R (T) ⁇ and the resistance value at the reference temperature ⁇ is R,
  • this change rate ⁇ is referred to as a resistance temperature coefficient.
  • a high resistance member that covers the surface of each spacer 8 to prevent charging.
  • the upper end 8a side force of each spacer 8 is also formed by depositing oxygen chrome and the spacer 8 is 180 degrees.
  • a tantalum and aluminum oxide compound was formed from the lower end 8b side of the spacer 8 by sputtering.
  • the temperature coefficient of resistance of the film 20 can be gradually changed along the axial direction of the spacer 8, specifically, the film 20 from the front substrate 2 toward the rear substrate 4. The temperature coefficient of resistance was gradually increased. As a result, even when the temperature rises significantly near the upper end 8a of the spacer 8, the rate of change in resistance with respect to the temperature change of the coating 20 can be kept low compared to the case near the lower end 8b. The adverse effect on the electron beam trajectory can be suppressed.
  • oxide chromium is deposited from the upper end 8a side of each spacer 8 by sputtering, and the axial direction of the spacer 8 is
  • the film thickness of the film 20 was varied along the lines. Specifically, the film thickness was reduced from the upper end 8a to the lower end 8b.
  • the temperature coefficient of resistance of the film 20 can be gradually changed according to the change in film thickness, and the resistance temperature coefficient of the film 20 is gradually increased from the front substrate 2 to the back substrate 4. I was able to.
  • each spacer 8 is divided into two in the axial direction, and oxide chrome is formed on the side surface on the upper end 8a side. Then, an acid compound of tantalum and aluminum was formed on the side surface on the lower end 8b side.
  • the temperature coefficient of resistance of the coating on the upper end 8a side and the lower end 8b side of the spacer 8 can be made different in two stages, and the rate of change in resistance near the upper end 8a of the spacer 8 is reduced.
  • the electronic The adverse effect on the beam trajectory can be suppressed.
  • the side surface of the spacer 3 may be divided into three or more regions and covered with different high resistance members.
  • the resistance temperature coefficient of the coating 20 is increased along the axial direction of each spacer 8 (the gap direction between the front substrate 2 and the rear substrate 4). Because the difference is made, even if the temperature of the front substrate 2 rises over time, the change in trajectory of the electron beam emitted from each electron emitting element 16 over time can be suppressed, resulting in a deviation in the landing position. And can display high-quality images without color shift over a long period of time.
  • the present invention is not limited to the above-described embodiment as it is, but can be embodied by modifying the constituent elements without departing from the spirit of the invention in the implementation stage.
  • various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiment. For example, some components may be deleted from the total component force shown in the above-described embodiment.
  • the constituent elements in different embodiments may be appropriately combined.
  • the resistance temperature coefficient of the coating 20 covering the surface of each spacer 8 is varied along the axial direction of the spacer 8, thereby
  • the present invention is not limited to this, and the temperature coefficient of resistance along the axial direction of the spacer 8 may be varied using other methods. good.
  • the present invention is not limited to this, and an elongated strip spacer may be used. Even in this case, it is sufficient if the temperature coefficient of resistance of the coating covering each spacer is different between the upper end side contacting the front substrate 2 and the lower end side contacting the rear substrate 4.
  • the present invention is not limited to this, and any film forming method may be used. good.
  • the display device of the present invention has the above-described configuration and action, It is possible to suppress changes in the trajectory over time and to display high-quality images.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Abstract

La présente invention concerne un dispositif d’affichage comprenant un substrat arrière (4) doté d’un grand nombre d’éléments de décharge d’électrons par conduction de surface (16), un substrat avant (2) doté d’une couche de phosphore (12), une paroi latérale (6) pour fixer le substrat avant et celui arrière, et un grand nombre d’espaceurs (8). Un film destiné à éviter la formation de charge est disposé sur la surface de l’espaceur. Un coefficient de résistance thermique du film augmente graduellement en allant du substrat avant à celui arrière. Même lorsque la température du substrat avant dépasse celle du substrat arrière, la résistance du film ne varie pas sensiblement entre les deux extrémités de l’espaceur et il n’en résulte aucun effet négatif sur l’orbite d’un faisceau d’électrons passant à proximité de l’espaceur. Le coefficient de résistance thermique du film est variable en fonction de l’épaisseur ou du matériau du film.
PCT/JP2006/312635 2005-08-05 2006-06-23 Dispositif d’affichage Ceased WO2007017990A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005228455A JP2007048468A (ja) 2005-08-05 2005-08-05 表示装置
JP2005-228455 2005-08-05

Publications (1)

Publication Number Publication Date
WO2007017990A1 true WO2007017990A1 (fr) 2007-02-15

Family

ID=37727181

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/312635 Ceased WO2007017990A1 (fr) 2005-08-05 2006-06-23 Dispositif d’affichage

Country Status (3)

Country Link
JP (1) JP2007048468A (fr)
TW (1) TW200721223A (fr)
WO (1) WO2007017990A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102610471B (zh) * 2012-03-27 2014-09-10 福州大学 用厚膜介质作为隔离子的场致发射显示结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002505502A (ja) * 1998-02-27 2002-02-19 キャンデセント・テクノロジーズ・コーポレイション 温度差に適応するスペーサシステムを備えたフラットパネルディスプレイの設計及び製造
JP2005026176A (ja) * 2003-07-02 2005-01-27 Sony Corp 表示装置
JP2005063811A (ja) * 2003-08-12 2005-03-10 Canon Inc 画像形成装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002505502A (ja) * 1998-02-27 2002-02-19 キャンデセント・テクノロジーズ・コーポレイション 温度差に適応するスペーサシステムを備えたフラットパネルディスプレイの設計及び製造
JP2005026176A (ja) * 2003-07-02 2005-01-27 Sony Corp 表示装置
JP2005063811A (ja) * 2003-08-12 2005-03-10 Canon Inc 画像形成装置

Also Published As

Publication number Publication date
TW200721223A (en) 2007-06-01
JP2007048468A (ja) 2007-02-22

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