KR20030013642A - Display Device and Method of manufacturing the same - Google Patents

Abstract

PURPOSE: An image display apparatus and a manufacturing method therefor are provided to improve the focusing characteristics by improving the color feeling of inferior color. CONSTITUTION: A reinforcement glass(300) is layered on a panel(100) on which an image is played. The reinforcement glass(300) has a thickness of 1-5 mm. A bonding material layer(200) is formed between the panel(100) and the reinforcement glass(300) in order to adhere the reinforcement glass(300) onto the panel(100). The bonding material layer(200) having a thickness of 0.1-3 mm includes a thermoplastic resin and a pigment. The reinforcement glass(300) and the bonding material layer(200) protect an image display apparatus from the impact.

Description

Display device and method of manufacturing the same

The present invention relates to an image display device and a method for manufacturing the same, and more particularly, to an image display device and a method for manufacturing the reinforcing glass is bonded to the outer surface of the panel.

In the image display apparatus, the color cathode ray tube is composed of a panel 1 having a fluorescent film 4 attached to its inner surface and a funnel 2 having a funnel-shaped neck portion 3 rearward as shown in FIG. The neck portion 3 has a built-in electron gun 6 that emits three electron beams R, G, and B for displaying a phosphor screen, so that the electron beam 5 emitted from the electron gun 6 is necked. The screen is controlled by the magnetic field of the deflection yoke 7 attached to the negative outer circumference, and color screening is performed by the shadow mask 8 so as to collide with a predetermined position on the screen of the fluorescent film 4 so as to emit the phosphor to display the screen. It is a display.

In the color cathode ray tube, the panel 1 is made of glass, and the inside of the panel is high vacuum, so that the panel 1 undergoes a high-temperature furnace such as baking during the manufacturing process. Cracks occur. Therefore, there is a constant curvature at which the stress will escape or a thickness above a certain level is required. However, when the glass is thick, the transmittance is worsened, such as the efficiency of the brightness is lowered, the weight is increased and the price is increased.

Therefore, the above problem is solved by maintaining an appropriate thickness and attaching the reinforcing material 10 to the front surface thereof. In particular, in the case of a planar imager, there is almost no curvature, so the demand for reinforcement is greater. Accordingly, the reinforcement glass or the reinforcement film is generally used, but since the reinforcement film is deteriorated due to the cloudy feeling, the reinforcement glass is used for the high-quality imaging device.

The method of attaching the reinforcement glass 10 to the panel 1 is based on a lamination process. In the lamination process, as shown in FIG. 2, ultraviolet (UV) light is used as an adhesive material between the panel 1 and the reinforcement glass 10. ) Is used to cure the resin (20). However, when using the ultraviolet curable resin 20, a complicated process is required, and the defect rate is high, and in order to increase the explosion-proof function, the film thickness must be thickened. If the thickness becomes thick during UV curing, light transmittance may be reduced and non-uniform, resulting in uneven crosslinking, which may cause problems such as deterioration of membrane properties and staining, and increase in manufacturing cost. There is a problem that contains.

On the other hand, the image display device emits red, green, and blue phosphors as an acceleration current from the electron gun to implement color. In order to realize the white color of a predetermined color coordinate, the phosphors of red, green, and blue must be properly adjusted. At this time, green and blue are similar in color, but red is different. Therefore, it is easy to overload the red side in order to produce white. In addition, when color coordinates do not match due to differences in applicability, screen design, transmittance of panels and reinforcing glass, and luminous efficiency of each color of the phosphor, overload of a current ratio with respect to a specific color, especially a red side occurs. Due to such overload, poor focus and color purity occur, and deterioration of the red phosphor and shortening of lifespan occur. In addition, there is a problem in that the life of components such as the electron gun and the cathode is shortened due to the overload caused by the red side of the electron gun.

In addition, various demands on the body color of the front surface of the image display apparatus have been generated due to the expansion of consumer's awareness of the color, so that a colorful object color is required even when the image display apparatus is turned off. This object color is generally measured using La * b * coordinates and is affected by panel transmittance, color, color and reflectivity of the PH portion of the fluorescent surface, and size of the graphite band. Very hard. Therefore, the conventional video display device cannot easily change colors of panels, fluorescent screens, graphite, and the like, and thus it is difficult to meet the demands of the consumer.

In addition, in order to improve the contrast characteristics of the color cathode ray tube, there is a method of coloring the panel or the reinforcement glass as necessary to adjust the transmittance, but it is difficult to adjust the proper transmittance due to manufacturing process or technical difficulties, and the price of parts is increased. There is a problem. On the other hand, the outer panel is flat, the inner panel has a curvature of the Easy Flat cathode ray tube, the luminance uniformity of the cathode ray tube is reduced due to the difference in the thickness of the center and the peripheral panel, the outer coating having a low transmittance to solve this problem Although there is a method of forming a thickness difference between the central part and the peripheral part, it is very difficult to adjust the uniform transmittance while satisfying the anti-reflection and anti-static properties of the coating. The conditions are difficult and the productivity is lowered.

Therefore, there is a need for a method for adhering the reinforcement glass to the panel surface by a simple process, realizing a color of a predetermined color coordinate, a colorful object color without overload, and adjusting an appropriate transmittance.

The present invention has been made to solve the above problems, an object of the present invention is to improve the color of poor color without overload, to implement a high-quality body color for the color of the entire visible light region, the contrast by adjusting the transmittance The present invention provides an improved image display device and a method of manufacturing the same.

Another object of the present invention is to provide an image display apparatus and a method of manufacturing the formed tempered glass excellent in explosion-proof characteristics by a simple process.

1 is a schematic cross-sectional view of a typical cathode ray tube.

FIG. 2B is a cross-sectional view of portion A of FIG. 1.

3 is a cross-sectional view of a panel of the image display device according to the present invention.

4A to 4E are cross-sectional views of a manufacturing process of an image display device according to the present invention.

5A is a general structural formula of a dye.

5b and 5c are photographs showing the structures of inorganic pigments and organic pigments, respectively.

6a to 6e are graphs showing the characteristics of the color spectrum of the pigment.

7 is a graph showing changes in the characteristics of the spectrum according to the concentration of the pigment.

8 is a graph showing changes in body color for each color of the pigment.

FIG. 9 is a graph illustrating spot size change, which is a focus characteristic when the IK current is decreased.

<Description of main parts of drawing>

1, 100: panel

10, 300: tempered glass

20, 200: adhesive material layer

In order to achieve the above object, the present invention is a video display device in which the reinforcement glass is laminated on the panel surface on which the image is displayed, the thermoplastic resin and pigment between the panel and the reinforcement glass in order to adhere the reinforcement glass on the panel Provided are an image display device and a method of manufacturing the same, wherein an adhesive material layer is formed.

In this case, the image display device is a panel coated with a fluorescent film on the inner surface, a funnel having a funnel-shaped neck portion rearward, an electron gun mounted to the neck portion to emit an electron beam, a deflection yoke for deflecting the electron beam, the deflection yoke It may be a color cathode ray tube, or a planar color cathode ray tube, characterized in that it comprises a shadow mask for screening the deflected electron beam.

The inventors of the present invention devised the application of the pigment to solve the problems of the conventional image display device, if the coating of the pigment on the outer surface of the panel, the quality and performance of the existing coating is reduced, uniform dispersion is difficult, Since it is difficult to apply due to degeneration or crystallization due to the environment, it was devised to add an additional pigment to the material layer for bonding the reinforcement glass to the panel.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

3 is a cross-sectional view of a panel portion of an image display apparatus according to the present invention. In the present invention, a reinforcement glass 300 is laminated on a surface of a panel 100 on which an image is displayed, and the reinforcement glass 300 is disposed on the panel 100. Provided is an image display device in which an adhesive material layer 200 including a thermoplastic resin and a pigment is formed between the panel 100 and the reinforcing glass 300 to bond the same.

As said thermoplastic resin, polyvinyl butyral is preferable. Polyvinyl butyral is a thermoplastic resin of polyvinyl acetals, and is produced by condensation reaction of polyvinyl alcohol and butyl aldehyde. It is colorless and transparent, having a light transmittance of 98% or more and 1.48 to 1.5, similar to the refractive index of glass (1.52). It has a refractive index of, so that the dual phase due to the external light transmission of the color cathode ray tube does not appear, it is plasticized at low temperature (glass transition temperature (Tg) ≒ 78 ° C), and it is easy to bond, and the sheet is flexible at low temperature and has a high impact strength. This is because it has a strong function of mitigating the external shock of the color cathode ray tube. As such, when the polyvinyl butyral is laminated between the panel 100 and the reinforcement glass 300, the polyvinyl butyral is interposed between the OH component of the polyvinyl butyral and the silanolic acid of the panel 100 and the reinforcement glass 300. Hydrogen bonds are strongly attached to each other.

The pigment may be used as long as it exhibits a color suitable for characteristics of an image display device and high-quality body color, but has a light emission spectrum in a wavelength range of 380 to 780 nm, which is a visible light region, and has black, purple, red, green, blue, and yellow colors. And at least one pigment among white pigments.

In order to apply color, dyes or pigments may be added. Generally, dyes have a structure as shown in FIG. 5A, and have excellent coloring and dispersibility, but have poor light resistance and heat resistance, and thus may be denatured within 100 ° C. The hiding power for is not good.

Pigments are broadly divided into inorganic pigments and organic pigments. Inorganic pigments are pigments composed of inorganic compounds having a structure as shown in FIG. 5B, and are also called mineral pigments. However, it is opaque and insufficient in concentration. The organic pigment is an organic colorant having a structure as shown in FIG. 5C and used in a state of being insoluble in a solvent such as water or oil and dispersed in a medium. The organic colorant has a clear color tone and excellent colorability and transparency, but is lower than an inorganic pigment in light resistance. .

The reinforcing glass and the adhesive material layer is to reduce the impact on the external impact of the image display device, the adhesive material layer is preferably a thickness of 0.1 to 3mm, considering the cost and explosion-proof characteristics of 0.3 to 1.0mm thickness Is more preferable. On the other hand, the thickness of the reinforcement glass is preferably 1 to 5mm.

4A to 4E are cross-sectional views of a manufacturing process of an image display apparatus according to the present invention, the present invention comprises the steps of preparing a bonding material by uniformly dispersing a specific pigment in a thermoplastic resin; Stacking the adhesive material on the panel 100 surface of the image display device so as to have an uneven shape (see FIG. 4A); Stacking the reinforcement glass 300 on the adhesive material layer 200 (see FIG. 4B); Vacuum-processing the image display apparatus in which the tempered glass is stacked (see FIG. 4C); And removing the vacuum (FIG. 4E) after heating (FIG. 4D) and cooling the vacuum-processed image display apparatus (FIG. 4E).

The preparing of the adhesive material is a process of uniformly dispersing a specific pigment in the thermoplastic resin. In this way, a pigment of a desired color is added to the adhesive material composed of the thermoplastic resin together with a plasticizer in an appropriate amount according to a desired transmittance. Treatment is necessary to prevent and to ensure dispersibility.

In order to prevent the deposition, it is preferable to perform a wetting process in which a liquid surfactant is buried around the solid pigment, and in order to secure the dispersibility, the pigments that are aggregated in the solid state by physical milling or the like are used. The method of separating by particles is preferable.

As the thermoplastic resin, polyvinyl butyral is preferable, and the pigment may be used as long as the pigment exhibits a color suitable for the characteristics of a video display device and a high-quality body color. It is preferable to have it, and consist of at least 1 or more pigments of a pigment of black, purple, red, green, blue, yellow, and white.

4A is a cross-sectional view of an adhesive material laminated on the surface of the panel 100 of the image display device to have an uneven shape, and the adhesive material is laminated in the uneven shape to provide a passage through which air can escape in a subsequent vacuum treatment process. It is.

Figure 4b shows a cross-section of the reinforcing glass 300 is laminated on the adhesive material layer 200 laminated in the concave-convex shape.

FIG. 4c illustrates a vacuum processing step of the image display device, and includes a vacuum band made of a material such as silicone rubber having excellent heat resistance and softness to prevent air bubbles caused by the air layer between the panel, the adhesive material layer and the reinforcement glass. The outer shell is sealed and a vacuum is formed between the reinforcing glass and the adhesive material layer and between the adhesive material layer and the panel. Vacuuming may be performed using a vacuum pump after placing the CRT assembly in a vacuum chamber. The vacuum treatment is preferably 50 torr or less.

4D illustrates a step of heating the vacuum-processed image display apparatus, and the heating is performed at 120 to 200 ° C. for about 10 to 30 minutes using an infrared heater, a halogen heater, a heating plate, or a hot air. As a result of the heating, the adhesive material layer is softened, and the concave-convex shape is deformed as shown in FIG. 4E due to the air pressure from the outside and the compression effect by the vacuum between the reinforcing glass and the panel. Thereafter, cooling is performed, and the vacuum is removed to complete the image display apparatus.

Hereinafter, the characteristics of the image display apparatus manufactured by the above method will be described with reference to the drawings.

6a to 6e are characteristics of the spectrum for each color of the pigment when the pigment is applied to the adhesive material, and the brightness and contrast properties depend on the characteristics of the spectrum, so that it is possible to adjust the brightness and contrast by applying a suitable pigment.

7 is a change in the characteristics of the spectrum according to the concentration of the pigment when the pigment applied to the adhesive material. The density can be adjusted in proportion to the thickness of the adhesive material layer, and the brightness and contrast can be controlled by adjusting the desired color and spectral characteristics as the same pigment by adjusting the density and thickness.

Considering that the thickness of the preferred adhesive material layer of the present invention is in the range of 0.1 to 3 mm, the concentration of the pigment is preferably 0.0001% to 0.5%.

8 is a change in the object color for each color of the pigment. Table 1 below shows the object color of the image display device including the adhesive material to which the pigment is applied as La * b * coordinates.

SPL purple green blue White Red Red + blue L 16.76 16.245 14.525 22.585 15.41 17.76 a * 4.78 -7.05 -0.865 -0.385 4.88 -2.525 b * -8.895 -3.57 -3.07 -6.55 1.525 -6.085

La * b * coordinate system is a color space for measuring object color.

L is the reflected luminance and shows achromatic color toward the center.

a * and b * are color coordinates based on the tristimulus values of the standard perfect reflector.

In other words, it is possible to implement a body color of the color desired by the consumer by applying the pigment, and by adjusting the sea color to improve the color of the desired color to secure the balance of the discordant IK ratio. For example, when an IK current is overloaded in a red phosphor, an iron oxide-based red pigment may be applied to an adhesive material layer to improve red color, thereby controlling the IK ratio to prevent overload on red. In addition, it prevents deterioration and lifespan reduction of overloaded phosphors, especially red phosphors using a rare earth metal as a core, improves purity and red color, and improves lifetime of components such as cathodes.

However, when the pigment is applied in a large amount, it is possible to reduce the luminance characteristic, so that it is necessary to match with an appropriate body color. In this way, the panel is controlled by adjusting the concentration and thickness by using a clear band having a transmittance of 90%, thereby improving the body color and contrast of a high quality without degrading the brightness, and decreasing the transmittance of the adhesive material layer. Although there is a decrease in brightness due to the increase in the G load current due to the improvement of the IK ratio balance and the phosphor emission efficiency can be secured equal or more. In addition, it is possible to improve the IK ratio and to improve the color by improving the color of the one lacking color.

9 shows a change in spot size, which is a focus characteristic when the IK current is reduced. That is, by applying a pigment, the focus is improved by reducing the current overloaded by the phosphor due to the reduction of the IK current.

Hereinafter, the experiments performed by the present inventors and their results will be described in order to compare the image display device (the embodiment) according to the present invention with the image display device (the comparative example) according to the prior art.

Example 1

1. 0.015% of red organic pigment was milled and then wetted and dispersed in polyvinyl butyral resin to form an adhesive material.

2. The adhesive material prepared in 1 was laminated on the outer surface of the cathode ray tube panel to a thickness of 0.76 mm, and then the reinforcing glass having an antistatic coating formed on the outer surface was laminated on the adhesive material layer.

3. Seal the outside of the cathode ray tube on which the reinforcement glass is laminated and seal it with a vacuum band, and then remove the air between the reinforcement glass and the adhesive material layer, and the adhesive material layer and the panel by using a vacuum pump. A vacuum was formed.

4. The temperature of the adhesive material layer itself was heated to 120 ° C. for 10 minutes using a halogen heater.

5. The upper layer of the tempered glass was pressurized with a pneumatic cylinder, cooled, and then vacuum was removed to prepare a cathode ray tube.

Comparative Example 1

A cathode ray tube was manufactured in the same manner as in Example, except that an ultraviolet curable resin was used instead of the polyvinyl butyral resin.

Comparative Example 2

A cathode ray tube was manufactured in the same manner as in Example, except that only the polyvinyl butyral resin was used as an adhesive without applying a pigment.

Characteristics of the cathode ray tube manufactured by the above method are shown in Table 1 below.

Table 1

IK ratio Luminance Contrast R / G R / B (500 ㎂ / FL) 200 Lux Comparative Example 1 1.42 1.34 28.8 18.7 Comparative Example 2 1.41 1.32 28.9 18.7 Example 1 1.15 (20%) 1.12 (16%) 29.4 (102.3%) 20.8 (111%)

As can be seen from Table 1, the cathode ray tube manufactured according to the embodiment of the present invention was improved by 20% and 16%, respectively, of the ratios of R / G and R / B, which is a mismatch of IK ratios for R, G, and B, respectively. . In addition, since the current overloaded on the R side was distributed to the G side where the light emission luminance was high, the luminance was also increased by 2.3% and the contrast was increased by 11%.

Example 2

Cathode ray tubes were prepared in the same manner by applying the same pigments as in Example 1 above to an Easy Flat cathode ray tube having an outer plane and an inner clear panel of curvature.

Comparative Example 3

A cathode ray tube was manufactured by coating the exterior of the Easy Flat cathode ray tube having a tin panel without applying a pigment as in Example 2.

In Example 2 and Comparative Example 3, the luminance uniformity, that is, the results of measuring the luminance ratio of the peripheral portion to the peripheral portion luminance are shown in Table 2 below.

TABLE 2

One 2 3 4 5 6 7 8 9 Average Comparative Example 3 82% 81% 79% 83% 100% 80% 91% 92% 88% 86% Example 2 98% 94% 97% 96% 100% 95% 94% 95% 98% 96%

As can be seen in Table 2, in the embodiment according to the present invention, the luminance uniformity was improved by 10% compared to the comparative example according to the prior art.

The image display device according to the present invention by the above structure improves the color of the poor color by a simple process to secure the IK harmonization, improve the focusing characteristics, and implement the desired high-quality body color for the color of all visible light region It is possible to change the transmittance freely, and the contrast is improved.

In addition, luminance uniformity is improved in an Easy Flat cathode ray tube product.

Claims (13)

In an image display apparatus in which reinforcement glass is laminated on a panel surface on which an image is displayed, an adhesive material layer including a thermoplastic resin and a pigment is formed between the panel and the reinforcement glass in order to bond the reinforcement glass on the panel. An image display device. The method of claim 1, And the thermoplastic resin is polyvinyl butyral. The method of claim 1, The pigment has an emission spectrum in the wavelength range of 380 to 780nm which is a visible light region, and the image display device, characterized in that at least one or more of the pigments of black, purple, red, green, blue, yellow and white. The method of claim 1, The pigment is an image display device, characterized in that the concentration is 0.0001% to 0.5%. The method of claim 1, And the thickness of the adhesive material layer is 0.1 to 3 mm. The method of claim 1, The thickness of the reinforcement glass is an image display device, characterized in that 1 to 5mm. Preparing an adhesive material by uniformly dispersing a specific pigment in a thermoplastic resin; Stacking the adhesive material to have a concave-convex shape on the panel surface of the image display device; Stacking a reinforcement glass on the adhesive material layer; Vacuum processing the image display apparatus on which the reinforcing glass is laminated; And And removing the vacuum after heating and cooling the vacuum processed image display device. The method of claim 7, wherein And the thermoplastic resin is polyvinyl butyral. The method of claim 7, wherein The preparing of the adhesive material is a method of manufacturing an image display apparatus, characterized in that the pigment is uniformly dispersed in a thermoplastic resin by wetting after milling. The method of claim 7, wherein The thickness of the adhesive material layer is a manufacturing method of the image display device, characterized in that the laminated to a thickness of 0.1mm to 3mm. The method of claim 7, wherein The thickness of the reinforcement glass is a manufacturing method of the image display device, characterized in that 1mm to 5mm. The method of claim 7, wherein And said vacuum process is 50 torr or less. The method of claim 7, wherein And the heat treatment is performed at 120 to 200 ° C. for about 10 to 30 minutes.