Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
  • H01J11/20—Constructional details
  • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C3/00—Glass compositions
  • C03C3/04—Glass compositions containing silica
  • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
  • C03C8/02—Frit compositions, i.e. in a powdered or comminuted form
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
  • C03C8/24—Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
  • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
  • H01J11/20—Constructional details
  • H01J11/48—Sealing, e.g. seals specially adapted for leading-in conductors
• • 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
  • H01J29/863—Vessels or containers characterised by the material thereof

Definitions

• the present invention relates to a display panel in which a front plate glass and a back plate glass are hermetically sealed via a low melting point sealing glass, and in particular, the front plate glass and the rear plate glass are hermetically sealed via a low melting point sealing glass.
• the present invention relates to a plasma display panel.
• a plasma display panel (hereinafter referred to as “PDP”) has a structure in which a front plate glass and a back plate glass are bonded together via a low melting point sealing glass.
• the front plate glass is formed with a transparent electrode made of an ITO film, a nesa film or the like on its surface, and a dielectric layer is formed after the dielectric glass is applied thereon.
• the back plate glass has electrodes made of Al, Ag, Ni, etc. formed on the surface thereof, and a barrier rib (also referred to as a barrier rib) is formed after dielectric glass and barrier rib material are applied thereon.
• the front plate glass and the rear plate glass are made to face each other and the electrodes and the like are aligned, and then the front plate glass and the rear plate glass are hermetically sealed using the low melting point sealing glass.
• Patent Document 3 even if warpage occurs in the plate glass, if the plate glass with the amount of warpage specified in the range of 1 X 10 _2 m _ 1 ⁇ l / R ⁇ 1 X ⁇ ⁇ ⁇ 1 is used, it is hermetically sealed. It is described that it is possible to suppress the breakage of the glass sheet during wearing and to improve the yield.
• R is the curvature radius of the curvature of the glass sheet.
• Patent Document 1 JP-A-8-290938
• Patent Document 2 JP-A-8-290939
• Patent Document 3 Japanese Patent Laid-Open No. 10-283941
• the PDP warps after the front plate glass and the rear plate glass are hermetically sealed with the low-melting point sealing glass, the PDP is used for the vacuum exhaust, rare gas sealing, and exhaust pipe sealing processes that are provided thereafter.
• the PDP easily shifts in a firing furnace such as a belt furnace, resulting in a decrease in the production yield of the PDP.
• the sheet glass used for PDP has a plate thickness of approximately 2.8 mm. However, if the sheet thickness is less than 2 Omm, for example, it will be possible to make a significant contribution to the overall light weight of the PDP. . However, if the plate thickness of the plate glass is reduced, the plate glass is likely to be thermally deformed or shrunk in the PDP manufacturing process, which causes the same problem as in the case of increasing the screen size.
• Patent Documents 1 and 2 when high strain point glass having a strain point of 570 ° C or higher is used as a plate glass, thermal deformation caused by the thermal properties (strain point, etc.) of the plate glass in the PDP manufacturing process. Shape and heat shrinkage can be suppressed.
• Patent Document 3 when the difference in coefficient of thermal expansion between the plate glass and the dielectric layer is set to an appropriate value, it is possible to suppress the warpage of the plate glass that occurs when the dielectric layer is formed on the plate glass. However, even when a high strain point glass having a strain point of 570 ° C or higher is used and the thermal expansion coefficient of the dielectric layer formed on the plate glass is set to an appropriate value, the thickness of the plate glass is small. When the size is large, when the front and rear glass plates are hermetically sealed with the low melting point sealing glass, the plate glass is greatly warped, which is a major obstacle to achieving a large screen, high definition and light weight. Become.
• the present invention has been made in view of the above circumstances, and even when a plate glass having a small plate thickness and a large size is used, the front plate glass and the back plate glass are sealed with a low melting point. It is an object of the present invention to provide a display panel that does not warp the plate glass when hermetically sealing with the glass, and to contribute to achieving a large screen, high definition, and light weight of the display panel.
• the present inventors have found that the front plate glass and the back plate glass are placed on the display panel in which the front plate glass and the back plate glass are hermetically sealed via the low melting point sealing glass.
• the present inventors have found that a large screen, high definition, and light weight can be achieved for the panel, and propose the present invention.
• a display panel in which a front plate glass and a rear plate glass are hermetically sealed via a low-melting point sealing glass, for example, a PDP has a gap (gap) between the front and rear plate glasses that is sealed with a low-melting point sealing glass. It corresponds to the thickness and has a very small value.
• the thermal expansion coefficients of the front plate glass and the rear plate glass are mismatched, the front plate glass and the rear plate glass are hermetically sealed with a low-melting-point sealing glass, and then concave on the side of the plate glass having a large thermal expansion coefficient. It became clear that warping occurred in the display panel due to this.
• the thickness of the PDP front and back glass is less than 2.8 mm
• the plate glass thickness is less than 2.8 mm
• the thermal expansion coefficients of the front plate glass and the rear plate glass are mismatched, the front plate glass and the rear plate glass are hermetically sealed with the low melting point sealing glass, It has been clarified that a concave warp tends to occur on the side of the plate glass having a large expansion coefficient.
• the present inventors restricted the difference in thermal expansion coefficient between the front plate glass and the rear plate glass to 2. OX 10_ 7 / ° C or less when the plate glass thickness is less than 2.8 mm. Then, after the front plate glass and the back plate glass were hermetically sealed with the low melting point sealing glass, it was found that a situation in which a concave warp occurs on the side of the plate glass having a large thermal expansion coefficient can be suppressed.
• the manufacturing conditions of the plate glass for example, when manufactured by the float method, precise temperature control and melting of the glass melt flowing into the tin bath.
• a thorough management method such as precise temperature control of tin, precise control of heater output and prevention of output fluctuations, and strict management of batch component fluctuations is also effective.
• the difference in thermal expansion coefficient between the front plate glass and the rear plate glass is preferably 0.01 X 10 _7 / ° C or more. If the difference in coefficient of thermal expansion between the front plate glass and the back plate glass is regulated to less than ⁇ ⁇ 01 X 1CT 7 / ° C, the plate glass manufacturing cost may increase and the display panel manufacturing cost may increase.
• the display panel of the present invention has a thickness of less than 2.8 mm between the front plate glass and the rear plate glass, which is sealed with the display panel in which the front plate glass and the rear plate glass are hermetically sealed via the low melting point sealing glass.
• the front plate glass and the back plate glass are low melting point sealing glass in the display panel manufacturing process. When it is hermetically sealed, it can greatly contribute to achieving a large display, high definition, and light weight of the display panel without warping the glass sheet.
• the display panel of the present invention it is possible to remarkably reduce the warpage of the plate glass caused by the difference in thermal expansion coefficient between the front plate glass and the back plate glass, and in addition, the display panel screen is distorted, curved, or blurred. Etc. can be remarkably reduced.
• an internal structure in which the inside of the cell is appropriately partitioned can be ensured, and as a result, high-definition image quality without turbidity (crosstalk) of the emission color can be realized.
• the “thermal expansion coefficient difference” means an average thermal expansion coefficient difference in a temperature range of 30 to 380 ° C.
• the front plate glass and the back plate glass are not intended to exclude an aspect in which the glass composition is different.
• the weight of the entire PDP can be greatly reduced by reducing the thickness of the power plate glass in which a plate glass having a thickness of 2.8 mm is mainly used for the PDP.
• the plate thickness of the plate glass is reduced, the warpage of the plate glass increases due to the difference in thermal expansion coefficient between the front plate glass and the back plate glass, and the tendency is large when the plate thickness is less than 2.5 mm, and less than 2.0 mm. When it is larger than 1. When it is less than 5mm, it is even larger. If the thickness of the plate glass is halved, the warp of the display panel due to the difference in thermal expansion coefficient between the front plate glass and the back plate glass will be doubled.
• the effect brought about by the display panel force S of the present invention can be enjoyed more accurately.
• plate glass thickness If the front plate glass and the rear plate glass have a difference in thermal expansion coefficient of 2.8 mm or more, the display panel warps when the front plate glass and the rear plate glass are hermetically sealed with the low melting point sealing glass. The effect of the display panel of the present invention is poor.
• the thermal expansion coefficient difference of the back plate glass front plate glass is a 2.0X10- 7 / ° C or less, preferably 1. 0X10- 7 / ° C or less, more preferably 0. 7X10- 7 Z ° C, more preferably 0. 5X10- 7 Z ° C, and most preferably not more than 0.4X10- 7 / ° c.
• the higher the definition of the display panel the greater the effect of display warpage on the display image. In particular, have you the high-definition PDP of 40 inches or more, desirable that the thermal expansion coefficient difference of the back plate glass front plate glass below 0. 5X10_ 7 / ° C instrument particularly, the thickness of the glass sheet 2.
• the thickness of the plate glass is t (mm)
• the thermal expansion coefficient of the front plate glass is ⁇ (X 10 " 7 / ° ⁇
• the thermal expansion coefficient of the rear plate glass is ⁇ (X 10
• the thickness of the plate glass is t (mm)
• the coefficient of thermal expansion of the front plate glass is H (X 10 ⁇ / ° C)
• the coefficient of thermal expansion of the rear plate glass is H (X 10-so C). 40 inches or more in size 1
• the thickness of the plate glass is t (mm), and the thermal expansion coefficient of the front plate glass is ⁇ (X 10_ 7
• the size of the glass sheet according to the display panel of the present invention is preferably 37 inches (eg, length of 500 mm x width of 900 mm) or more and 32 inches (eg, length 450 mm x width 800 mm), and 42 inches (eg, 550mm x 1000mm), 50 inches (eg 700mm x 1200mm), 58 inches (800mm x 1350mm), 65 inches (eg 850mm x 1500mm) and more preferable.
• the plate glass size increases, the warpage of the display panel due to the difference in thermal expansion coefficient between the front plate glass and the back plate glass increases. That is, as the size of the plate glass increases, the effect brought about by the display panel of the present invention can be properly enjoyed.
• the size of the plate glass is less than 32 inches, even if there is a difference in the thermal expansion coefficient between the front plate glass and the rear plate glass, when the front plate glass and the rear plate glass are hermetically sealed with the low melting point sealing glass, the display panel Therefore, the effect of the display panel of the present invention becomes poor.
• the sealing thickness of the low-melting point sealing glass according to the display panel of the present invention is less than 500 ⁇ m, preferably less than 400 zm, more preferably less than 300 zm, more preferably less than 300 zm, more preferably less than 250 zm. Most preferred. If the sealing thickness of the low melting point sealing glass is reduced, the degree of adhesion between the front plate glass and the rear plate glass is increased, and the warpage of the display panel is increased. That is, as the sealing thickness of the low melting point sealing glass becomes smaller, the effect brought about by the display panel of the present invention can be enjoyed more accurately.
• low melting point refers to a case where the softening point measured by a differential thermal analysis (DTA) apparatus is 600 ° C. or lower.
• the strain point of the plate glass according to the display panel of the present invention is preferably 570 ° C or more, more preferably 580 ° C or more, more preferably 590 ° C or more, and most preferably 600 ° C or more. If the glass strain point is less than 570 ° C, the glass sheet tends to crack or warp due to the thermal characteristics of the glass sheet during the heat treatment process when manufacturing the display panel. It becomes easy to cause deformation.
• the plate glass according to the display panel of the present invention can use various glasses such as soda lime glass, borosilicate glass, aluminosilicate glass, barium strontium glass, and the like. ⁇ 50-70%, ⁇ 1 ⁇ 0-10%
• SiO is a glass network former. Suitable content is 50-70%, especially
• Al 2 O is a component that increases the strain point of glass. Suitable content is 0 to: 10%, in particular 0 to 8
• MgO is a component that lowers the high-temperature viscosity of the glass to increase the moldability and meltability of the glass and increase the strain point of glass.
• the preferred content is 0 to: 10%, in particular 1 to 9%.
• CaO is a component that lowers the high-temperature viscosity of glass to improve the moldability and meltability of the glass and increase the strain point of the glass.
• the preferred content is from 0 to: 10%, in particular from 0 to 6%.
• SrO lowers the high temperature viscosity of the glass to improve the moldability and meltability of the glass. It is a component that raises the strain point of the process.
• the preferred content is from 0 to: 15%, in particular from 2 to: 13%.
• Sr_ ⁇ is the density of the glass is increased more, also there tends force s devitrification temperature of the glass rises.
• BaO like SrO, is a component that lowers the high-temperature viscosity of the glass and increases the moldability and meltability of the glass.
• the preferred content is 0 to: 15%, in particular 0 to 8%.
• BaO increases, the glass density increases and the devitrification temperature of the glass tends to increase. Since BaO is an environmentally hazardous substance, it is desirable to reduce it as much as possible without damaging its properties.
• ZrO is a component that increases the strain point of glass.
• the preferred range is 0 to: 10%, especially 0 to 6%
• B 2 O is a component that lowers the viscosity of the glass and improves the meltability and formability.
• the content of B ⁇ exceeds 5%, it will be added to the plate glass in the thermal process when manufacturing PDP.
• NaO is a component that controls the coefficient of thermal expansion of glass and increases the meltability of glass.
• the preferred content is 0 to: 10%, in particular 1 to 7%.
• KO like Na 2 O, controlled the coefficient of thermal expansion of glass and increased the meltability of glass.
• This component is The preferred content is 0 to 10%, in particular 2 to 10%.
• K O is a lot
• the plate glass used in the present invention can be applied with various components.
• various components for example, to prevent coloring by ultraviolet rays, up to 5% of Ti ⁇ and CeO
• clarifiers such as As ⁇ , Sb ⁇ , S ⁇ , SnO, CI etc.
• thermal expansion coefficient of the glass sheet according to the display panel of the present invention in the temperature range of 30 to 380 ° C, preferably it is 60 ⁇ 90 X 10- 7 / ° C instrument 65 ⁇ 85 X 10- 7 / ° C is even better.
• the thermal expansion coefficient becomes larger than 90 X 10_ 7 / ° C, Oite the manufacturing process of the display panel, heat cracking of the glass sheet due to the thermal expansion coefficient of the glass tends to occur.
• the thermal expansion coefficient of less than 60 X 10- 7 / ° C due to inconsistent thermal expansion coefficient of the dielectric glass or low melting point sealing glass and plate glass, as a result, the plate glass in the manufacturing process of the display panel The problem of thermal cracking is likely to occur.
• the plate glass according to the display panel of the present invention is charged with a glass raw material prepared to have a desired glass composition in a continuous melting furnace, and the glass raw material is heated and melted, defoamed, and then supplied to a molding apparatus. It can be produced by forming molten glass into a plate shape and slowly cooling it.
• a method for forming the plate glass according to the display panel of the present invention various forming methods such as a float method, a slot down draw method, an overflow down draw method, a redraw method and the like can be adopted, but the plate method is formed by the float method. It is preferable to do. The reason is that in the case of the float process, it is easy to obtain a large plate glass at a relatively low cost.
• the glass When a glass substrate is formed by the float process, the glass may be colored by a reducing atmosphere such as molten tin hydrogen or nitrogen. If a colored glass substrate is used as the front plate glass, it may cause problems such as deterioration of the image quality of the display panel. It can be used as the back plate glass.
• a reducing atmosphere such as molten tin hydrogen or nitrogen.
• the display panel of the present invention can have a structure corresponding to the type of display to be applied.
• an dielectric layer is formed on the surface of the front plate glass and the back plate glass.
• the formed dielectric layer regulates the thermal expansion coefficient of the dielectric layer to the value described in Patent Document 3, thereby suppressing the warpage of the display panel due to the difference in thermal expansion coefficient between the plate glass and the dielectric layer. Can be suppressed.
• the residual stress remaining on the plate glass should be as small as possible in order to suppress warpage and cracking of the plate glass due to the difference in thermal expansion coefficient between the plate glass and the dielectric layer.
• residual stress remaining on the glass sheet is regulated within the range of _800 to 1500 (psi) (preferably 1 to 1300 (psi), more preferably 0 to 1300 (psi)), the above problem will be solved. It becomes difficult to occur.
• residual stress remaining in the plate glass means that in the plate glass after firing, It means the residual stress existing in the plate glass observed when the interface with the dielectric layer is observed with a strain gauge. If the residual stress is a compressive stress, it is indicated by a “negative” value. If it is a bow stress, it is indicated by a “positive” value.
• the low melting point sealing glass used in the display panel of the present invention includes a PbO-B 2 O-based glass.
• V O -PO glass can be made into a glass composition that does not substantially contain PbO.
• substantially does not contain PbO refers to the case where the content of PbO in the glass composition is lOOOppm or less.
• Bi_ ⁇ _B O based glass a glass composition, in mol 0/0 Display, Bi_ ⁇ 30 to 50%, B
• It preferably contains ⁇ 25% (preferably 1-20%). If the glass fiber formation range is regulated as described above, a glass having a low melting point and good water resistance and thermal stability can be obtained.
• V_ ⁇ one P_ ⁇ based glass, as a glass composition, in mol 0/0 Display, VO 10 to 60%, P
• R is one or more selected from Mg, Ca, Ba, Sr
• 0-35% preferably 3-25%
• the low-melting point sealing glass has a thermal expansion coefficient matching with that of the plate glass.
• a fireproof filler is appropriately added for the purpose of improving the mechanical strength of the low-melting point sealing glass (for example, with respect to 100 parts by weight of the glass). Use 5 to 80 parts by weight of refractory filler).
• the thermal expansion coefficient of the low melting point sealing glass is adjusted so that a slight stress of tension is applied to the plate glass.
• fire resistant filler As one example, cordierite, willemite and tin oxide are made of Bi ⁇ BO-based glass, S
• the softening point of the low melting point sealing glass is preferably 450 ° C or lower.
• the sealing temperature must be higher than 530 ° C. Therefore, when air-sealing the front and back plate glasses with the low melting point sealing glass, There is a risk of thermal deformation and thermal contraction due to the thermal properties (strain point, etc.) of the plate glass.
• the display panel of the present invention is preferably applied to a PDP.
• PDP has a strong need to reduce the thickness of plate glass and increase the size of plate glass, which demands large screen size, high definition and light weight.
• PDP performs hermetic sealing between the front and rear glass plates in a thermal process of approximately 450 to 520 ° C, and the plate glass caused by the difference in thermal expansion coefficient between the front and rear glass sheets in the sealing process. This is because there is a high risk of warping.
• the display panel of the present invention is preferably applied to a field emission display (hereinafter referred to as FED).
• FED field emission display
• the warp of the plate glass can be reduced, the distance between the front plate glass and the rear plate glass can be made uniform, and the acceleration voltage applied between the front plate glass and the rear plate glass inside the FED apparatus. It is unlikely that the brightness of the FED will be adversely affected by variations in the speed of electrons or changes in the velocity of electrons that impact the phosphor.
• FED like PDP, has a strong need to reduce the plate thickness and increase the size of the plate glass, which demands a larger screen, higher definition, and lighter weight.
• the FED referred to in the present invention includes all types of FED having various electron-emitting devices.
• the structure of the present invention is a structure in which a front plate glass and a rear plate glass are hermetically sealed via a low-melting glass, and the thickness of the front plate glass and the rear plate glass is less than 2.8 mm, and the front plate glass And the difference in thermal expansion coefficient between the back plate glass and 2.0 ⁇ 10_ 7 Z ° C or less. Since the structure of the present invention can have the same structure and effects as the display panel of the present invention described above, the description thereof is omitted here for convenience. Needless to say, the structure of the present invention can have the same characteristics as those of the display panel of the present invention.
• the flat glass set for producing a display panel of the present invention is a flat glass set for producing a display panel having a front plate glass and a back plate glass, and has a coefficient of thermal expansion of the front plate glass and a coefficient of thermal expansion of the back plate glass. -2. 0 X 10_ 7
• the obtained display panel can have the same effects as the display panel of the present invention, in addition to the same characteristics.
• the description is omitted here for the sake of convenience.
• the front plate glass of the present invention is a front plate glass for producing a display panel having a front plate glass and a back plate glass, wherein the thermal expansion coefficient of the front plate glass is used and the thermal expansion coefficient of the rear plate glass is used.
• the back plate glass of the present invention is a back plate glass for producing a display panel having a front plate glass and a back plate glass.
• the thermal expansion coefficient of the front plate glass is ⁇
• the thermal expansion coefficient of the back plate glass is ⁇ .
• Tables 1 to 3 show examples of the present invention, and Table 4 shows comparative examples of the present invention.
• front plate glasses and back plate glasses having thermal expansion coefficients, strain points, and plate thicknesses as shown in Tables 1 to 4 were prepared.
• the front plate glass and the back plate glass shown in Tables 1 to 4 have the same electrode and dielectric layer formed. A lath having no cracks or warpage was used.
• the thermal expansion coefficients of the low melting point sealing glass and the dielectric layer are set to values that do not cause a mismatch with the thermal expansion coefficient of the plate glass.
• the low melting point sealing glass' dielectric layer The thermal deformation and thermal shrinkage caused by the mismatch between the thermal expansion coefficients of the glass and the plate glass were set to negligible values.
• PDPs were prepared using conventional PDP manufacturing parts and conventional PDP manufacturing methods.
• the thermal expansion coefficient of the plate glass was calculated by measuring the average thermal expansion coefficient in a temperature range of 30 to 380 ° C using a plate glass described in the Examples as a sample and a dilatometer.
• the strain point of the sheet glass was measured by a method in accordance with ASTM C336-71. As the temperature of the strain point is higher, it becomes possible to suppress thermal deformation and thermal contraction of the plate glass due to the thermal process in manufacturing the display.
• the strain point of the front plate glass and the back plate glass is considerably higher than the sealing temperature of the low melting glass, so that the glass deformation due to the thermal characteristics of the glass is negligibly small. is there.
• the amount of warpage of the display panel was calculated by irradiating a plate glass with a laser beam in parallel along the plate width direction and measuring the amount of change in shading of the laser beam due to the amount of warpage of the plate glass.
• Display panel warpage width for each side of the front glass And the value having the largest warp width was defined as the “warp amount”.
• a display with a warp of less than 3.5 mm means that the image quality is not reduced due to the effects of screen distortion, curvature, blurring, and so on.
• Table 5 in Table 4 has a large plate glass thickness of 3.5 mm, but the difference in thermal expansion coefficient between the front plate glass and the back plate glass is as large as 3.0 X 10 _7 Z ° C. The amount of warpage was 3.9 mm.
• Table 5 shows glass composition examples of plate glass applicable to the display panel of the present invention.
• the glass composition of the front plate glass is Glass A
• the glass composition of the back plate glass is Glass B
• a display panel is produced in the same manner as Example No. 1 in Table 1
• the amount of warpage of the display panel obtained is It can be seen that the value is the same as that of the display panel of Example No. 1 of 1.
• the display panel of the present invention has a thickness of less than 2.8 mm between the front plate glass and the rear plate glass, which is sealed with the display panel in which the front plate glass and the rear plate glass are hermetically sealed via a low melting point sealing glass.
• the front plate glass and the back plate glass are low melting point sealing glass in the display panel manufacturing process. When it is hermetically sealed, it can greatly contribute to achieving a large display, high definition, and light weight of the display panel without warping the glass sheet.
• the display panel of the present invention it is possible to remarkably reduce the warpage of the plate glass caused by the difference in thermal expansion coefficient between the front plate glass and the back plate glass, and in addition, the display panel screen is distorted, curved, or blurred. Etc. can be remarkably reduced.
• the display panel of the present invention is suitable not only for PDP but also for other displays.
• the display panel of the present invention is, for example, FED, plasma display. It is also suitable for dressed liquid crystal panels (PALC).
• PLC dressed liquid crystal panels

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• 2007
  • 2007-01-19 JP JP2007009728A patent/JP2007294395A/ja not_active Withdrawn
  • 2007-02-15 KR KR1020087010365A patent/KR20080055969A/ko active Search and Examination
  • 2007-02-15 WO PCT/JP2007/052667 patent/WO2007111054A1/ja active Application Filing
  • 2007-02-15 CN CN2007800017161A patent/CN101361155B/zh not_active Expired - Fee Related

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