KR20020079003A - Glass substrate for emissive display devices and method thereof - Google Patents

Abstract

PURPOSE: A glass substrate and method for manufacturing the same is provided to achieve improved display quality by enhancing color purity and contrast, while simplifying manufacturing procedures and reducing manufacturing cost. CONSTITUTION: A method for manufacturing glass substrate for luminous type flat panel display, comprises the steps of forming an electromagnetic shielding screen(13') on a surface of a soda lime glass(12), wherein the electromagnetic shielding screen is formed by adding Nd2O3 20 to 30 mole percent to ZnO; and forming a diffusion prevention screen(14') onto the electromagnetic shield screen, wherein the diffusion prevention screen is formed by adding Nd2O3 20 to 30 mole percent to SiO2. The electromagnetic shielding screen and the diffusion prevention screen are formed by a vacuum deposition method or printing method.

Description

Glass substrate for emissive flat panel display device and its manufacturing method {Glass substrate for emissive display devices and method}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate glass for a light emitting flat panel display device and a method of manufacturing the same. More specifically, a small amount of neodymium oxide (Nd ₂ O ₃ ), which is a rare earth oxide, is added to metal oxides such as zinc oxide and silicon oxide. A substrate glass for a light emitting flat panel display device having a color filter, an electromagnetic shielding function, and an ion diffusion preventing function having improved color purity and contrast of a phosphor by forming a film by vacuum deposition or printing using a material, and a method of manufacturing the same will be.

The structure of a light emitting flat panel display device such as a plasma display device (PDP), an organic / inorganic field emission device (EL), a field emission device (FED), a fluorescent display tube (VFD), a light emitting diode (LDE), and the like is shown in FIG. Although somewhat different depending on the device, it generally has the following structure. The display electrode 2 formed by the vacuum deposition method or the printing method between the front substrate glass 1 and the back substrate glass 8, the address electrode 7 and the light emitting layer 3 which forms visible light by the vacuum deposition method or the printing method. It consists of. The light emitting layer 3 basically consists of a red phosphor 4, a green phosphor 5, and a blue phosphor 6, and direct current or alternating current is applied to the display electrode 2 and the address electrode 7 to the driving circuit 9. When applied by the red phosphor 4, the green phosphor 5, and the blue phosphor 6, the excitation is relaxed to give visible light, thereby displaying an image or information. However, the current technology level of the phosphor for light emitting display devices has not reached perfect red, green, and blue reproduction. In addition, the reflection of external light on the panel surface is also serious. In particular, in the case of the PDP using excitation of the phosphor by gas discharge, the neon gas which is the discharge gas gives orange visible light having a wavelength of 585 nm, thereby degrading color purity and contrast. The color purity problem of the phosphor, the surface reflection of the external light, and visible light other than red, green, and blue from the discharge gas may have a fatal effect on the display quality of the flat panel display.

On the other hand, conventional light emitting display devices such as plasma display devices (PDP), organic and inorganic electroluminescent devices (EL), field emission devices (FED), fluorescent display tubes (VFD), light emitting diodes (LEDs), and the like, The substrate glass [FIG. 3] vacuum absorbs indium tin oxide (ITO) which is transparent to visible light and has good conductivity to shield electromagnetic waves generated from the device, thereby forming an electromagnetic shielding film 13 on one side of the soda lime glass 12. However, since indium tin oxide is an expensive material, there is a disadvantage of causing an increase in manufacturing cost. The diffusion barrier film 14, which is another oxide layer employed in the conventional substrate glass [Fig. 3], is mainly formed of silicon oxide by vacuum deposition, which is an alkali ion of the soda-lime glass 12 during the thermal process of device fabrication. This substrate material serves to prevent diffusion to the transparent electrode 15. The substrate glass [Fig. 3] used in the conventional light emitting flat panel display device has a simple manufacturing method and prevents electromagnetic shielding and ion diffusion. Although there is an advantage, it does not have a function as a color filter which has high manufacturing cost and improves color purity and contrast. As described above, adopting the color filter for flat panel display elements [Fig. 2] to improve the color purity and contrast to improve the display quality, disadvantages such as an increase in manufacturing cost and shortening of the element life cannot be avoided.

Even when the sensitivity (30%) of luminance is accompanied, the color filter for the flat panel display device shown in FIG. 2 is proposed as a method of improving display quality by improving color purity and contrast. In the conventional color filter for a flat panel display device as shown in FIG. 2, a red color filter 4 ′ and a green color filter between the front substrate glass 1 and the display electrode 2 or between the display electrode 2 and the light emitting layer 3. 5 'and the blue color filter 6' are formed by thick film firing, respectively, by screen printing or the like, and then a transparent dielectric or a black dielectric 11 is filled between the color filters. Iron oxide inorganic pigment is used as a material of the red color filter, and cobalt oxide inorganic pigment is used as a material of the green and blue color filter. In the case of screen printing, these inorganic pigments are mixed with low-temperature decomposable resins such as ethyl cellulose and organic solvents such as butyl carbitol acetate to form a paste, followed by thick film firing of red, green and blue color filters three times in sequence. do. The color filter for flat panel display elements formed by such a conventional screen printing method has to undergo three thermal processes of thick film firing, so that the manufacturing process is long and the consumption of materials is high, thus increasing the manufacturing cost and making a large area flat panel display element. There is a limit. In addition, thermal and electrical properties of the front substrate glass 1 and the display electrode 2 may be changed during the thermal process, and chemical reactions with the display electrode 2 may occur to shorten the life of the device. have.

Thus, the inventors of the present invention perform the function of the color filter instead of the electromagnetic shielding film 13 'and the diffusion barrier 14 having the function of the color filter instead of the electromagnetic shielding film 13 of the conventional substrate glass [FIG. 3] as shown in FIG. The present invention is completed by manufacturing a substrate glass for a light emitting flat panel display device having a diffusion barrier layer 14 'having a color filter function, an electromagnetic shielding function and an ion diffusion prevention function, which improve color purity and contrast of a phosphor. It became.

Therefore, the present invention forms a two-layer oxide dielectric film (electromagnetic shielding film, diffusion barrier film) on the substrate glass, a light emitting flat plate having the function of the color filter, the electromagnetic shielding function and the ion diffusion prevention function to improve the color purity and contrast of the phosphor An object of the present invention is to provide a substrate glass for a display device and a method of manufacturing the same.

1 is a cross-sectional view of a general structure of a light emitting flat panel display device.

2 is a cross-sectional view of a conventional color filter for flat panel display elements.

3 is a cross-sectional view of a conventional substrate glass for flat panel display elements.

Figure 4 shows a cross-sectional view of a multifunctional substrate glass having a color filter function according to the present invention.

Figure 5 shows the visible light transmission characteristics of the multi-functional substrate glass according to the present invention.

[Explanation of symbols on the main parts of the drawings]

DESCRIPTION OF SYMBOLS 1 Front substrate glass 2 Display electrode (transparent electrode) 3 Light emitting layer

4: red phosphor 4 ': red color filter

5: Green phosphor 5 ': Green color filter

6: blue phosphor 6 ': blue color filter

7 address electrode 8 back substrate glass 9 drive circuit

10: display light 11: transparent (or black) dielectric

12 soda-lime glass 13 electromagnetic shielding film

13 ': electromagnetic shielding film with color filter function

14: diffusion barrier 14 ': diffusion barrier having a color filter function

15: transparent conductive film

The present invention forms an electromagnetic shielding film in which 20-30 mol% of neodymium oxide (Nd ₂ O ₃ ) is added to zinc oxide (ZnO) on one side of soda-lime glass, and neodymium oxide on silicon oxide (SiO ₂ ). and the (Nd ₂ O ₃₎ of 20 ~ 30 ㏖ a diffusion prevention% addition of emissive flat panel display device and a method of manufacturing a glass substrate for forming thereon with its features.

Hereinafter, a method of manufacturing a substrate glass for a light emitting flat panel display device having a function of a color filter, an electromagnetic shielding function and an ion diffusion prevention function according to the present invention will be described in detail with reference to the accompanying drawings.

0.5 to 2 mol% of alumina (Al ₂ O ₃ ) or indium oxide (In ₂ O ₃ ) and 20 to 30 mol% of neodymium oxide (Nd ₂ O ₃ ) are added together to the zinc oxide (ZnO) powder 1100 to 1500 The material sintered at a temperature of < RTI ID = 0.0 > C < / RTI > is formed on the one side of the soda lime glass 12 by vacuum deposition or printing such as sputtering to a thickness of 1000 to 2000 nm to form an electromagnetic shielding film 13 'having the function of a color filter. Subsequently, a material obtained by mixing neodymium oxide (Nd ₂ O ₃ ) with a silicon oxide (SiO ₂ ) powder at a ratio of 20 to 30 mol% and sintering at 1100 to 1500 ° C., a thick film such as vacuum deposition or printing, such as sputtering A calcination method is formed on the electromagnetic shielding film 13 'with a thickness of 3000 to 5000 nm to form a diffusion barrier 14' having the function of a color filter.

The multifunctional substrate glass [FIG. 4] manufactured by the above method is used in the zinc oxide (ZnO) layer to which aluminum (Al) or indium (In) is added, so that aluminum or indium acts as an electron donor (donor). It can absorb the emitted electromagnetic wave by dipole current, and at the same time, neodymium (Nd) is added, and it transmits red, blue, green visible light without large loss by dipole transition of Nd, and absorbs the remaining light well and functions as a color filter. Will be shown. That is, it not only retains the functions of the electromagnetic shielding film and the diffusion barrier film, but also exhibits good visible light transmission characteristics as shown in FIG.

Example

1 mol% of alumina (Al ₂ O ₃ ) and 30 mol% of neodymium oxide were added together to a zinc oxide (ZnO) powder soda-lime glass (12) by vacuum evaporation or printing such as sputtering. A film having a thickness of 2000 nm was formed on one surface to form an electromagnetic shielding film 13 'having the function of a color filter. Subsequently, a silicon oxide (SiO ₂ ) powder was mixed with neodymium oxide (Nd ₂ O ₃ ) at a rate of 30 mol%, and the material sintered at 1400 ° C. was subjected to vacuum thin film deposition such as sputtering or thick film firing such as printing. A 5000 nm thick film was formed on the electromagnetic shielding film to form a diffusion barrier 14 'having a function of a color filter.

As can be seen in Figure 5, the multifunctional substrate glass having a ZnO: Al, Nd layer and SiO ₂ : Nd layer blocks most of the orange light of the wavelength of 585 nm and a transmission loss of less than 30% for red, green, and blue light. As seen, it was confirmed that sharp transmission peaks of 450 nm (blue), 485 nm (blue), 545 nm (green), 620 nm (red) and 650 nm (red) were shown. Therefore, BaMgAl ₁₀ O ₁₇ : Eu (blue) having a light emission size of 450 nm, YBO: Tb (green) having a light emission of 545 nm, Y ₂ O ₃ : Eu having a light emission of 590, 612, and 626 nm as a phosphor of a light emitting flat panel display device. When using phosphors such as red), it showed good red, green and blue color filters in addition to the functions of the electromagnetic shielding film and the diffusion barrier film.

As described above, the multifunctional substrate glass of the present invention has a simple manufacturing method by forming an oxide dielectric film containing a neodymium oxide (Nd ₂ O ₃ ) component which is a rare earth oxide by a thick film firing method such as vacuum deposition or printing. While reducing manufacturing costs, it is possible to achieve an outstanding visible color filter function, electromagnetic shielding function and ion diffusion prevention function simultaneously. Since the light absorption function of neodymium (Nd) used in the present invention is caused by the transition of electromagnetically shielded cabinet electrons which hardly change in any oxide, an oxide other than zinc oxide or silicon oxide, namely Ta _2, The same color filter is exhibited even when added to oxides such as O ₅ or Al ₂ O ₃ to form a thick film or a thin film.

Claims (5)

An electromagnetic shielding film in which 20-30 mol% of neodymium oxide (Nd ₂ O ₃ ) was added to zinc oxide (ZnO) was formed on one side of soda-lime glass, and neodymium oxide (Nd ₂ ) was formed on silicon oxide (SiO ₂ ). A diffusion preventing film containing 20 to 30 mol% of O ₃ ) is formed thereon. The method for manufacturing a substrate glass for light emitting flat panel display device according to claim 1, wherein aluminum or indium is added to the zinc oxide. The method of manufacturing a substrate glass for a light emitting flat panel display device according to claim 1, wherein the electromagnetic shielding film and the diffusion barrier film are formed by a vacuum deposition method or a printing method. An electromagnetic shielding film in which 20-30 mol% of neodymium oxide (Nd ₂ O ₃ ) was added to zinc oxide (ZnO) was formed on one side of the soda-lime glass, and neodymium oxide (Nd ₂ ) was formed on silicon oxide (SiO ₂ ). A diffusion barrier film containing 20 to 30 mol% of O ₃ ) is formed thereon, the substrate glass for light emitting flat panel display elements. The substrate glass for light emitting flat panel display device according to claim 4, wherein aluminum or indium is added to the zinc oxide.