KR20020017729A - Material that adhere reinforcing glass on Display - Google Patents

Abstract

PURPOSE: Provided is an adhesive material for attaching a reinforced glass to the front panel of an image display unit, which can improve contrast and a sense of color and prevent the change of color and improve productivity. CONSTITUTION: The adhesive material for the reinforced glass of the image display unit contains an ultraviolet curing resin and a pigment and additionally, an ultraviolet stabilizing agent such as benzophenone phenol or benzotriazole phenol and a heat stabilizing agent selected from the group consisting of Ba(OCOR)2, and Cd(OCOR)2, and ROCO(CH2)n.

Description

Reinforced glass adhesive material of image display device

The present invention relates to an image display device, and more particularly, to an adhesive material for adhering reinforcement glass to a panel of a front portion of an image display device.

Since the front panel is made of glass and the inside is high vacuum, the image display device is caused to be inflated due to suction and external impact inside, and also cracks while passing through high-temperature furnace such as baking during the manufacturing process. ) Occurs. Therefore, there is a constant curvature at which the stress is released or a thickness above a certain level is required. However, when the glass is thick, the transmittance is worse, the efficiency of the brightness, etc. are lowered, the weight is increased, and there is a problem economically.

Therefore, the above problem is solved by maintaining a suitable thickness and attaching reinforcing glass to the front surface. In particular, in the case of planar imagers, there is little curvature, so the demand for reinforcement is greater.

The method of attaching the reinforcing glass to the panel is based on a lamination process. At this time, it requires constant thickness, high transmittance, void, adhesion time, adhesion, delamination after adhesion, bubble free and scratch, reliability of light resistance and heat resistance, gas release, refractive index, workability and stability. . Therefore, in general, a resin that is cured using ultraviolet (UV) is used in the lamination process. The resin is mainly used in the form of acrylate having a short curing time. The monomers of urethane acrylate, isobonyl acrylate, and caprolactone are mainly used as oligomers, reaction diluents, and coupling agents. , Initiators and solvents, and exhibits different curing power and properties depending on the polymerization ratio and type upon polymerization thereof.

However, the conventional image display device emits three phosphors of red green blue as an acceleration current of an electron gun in order to produce white color. In order to produce whites having a predetermined color coordinate, proper tuning of the red green phosphors is required. Green and blue are similar in color, but red is different. Therefore, it is easy to overload the red side to produce white. Due to such an overload, the load of the current is increased in the phosphor, thereby deteriorating the focus, deteriorating the lifetime of the phosphor, shortening the purity and red color, and shortening the life of components such as an electron gun and a cathode.

In addition, as consumers' perception of color and demand for new designs are expanded, various demands on the body color of the front of the image display device are required, so that a colorful body color is required even when the image device is turned off. . However, the body color is affected by the transmittance and color of the panel, the color and reflectance of the PH portion of the fluorescent surface, and the size of the graphite band. However, in the conventional imaging apparatus, the color of the panel, the fluorescent surface, and the graphite cannot be easily changed.

In addition, coating properties and screen design vary according to manufacturing characteristics, and if not optimized due to the difference in luminous efficiency of phosphors, the color may be deteriorated to a specific color. Therefore, a color filter may be employed to improve this. Low productivity in terms of process and cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an image display device having improved characteristics of focus light by improving color of poor colors by adding color pigments to a resin to achieve IK ratio coordination. .

Another object of the present invention is to provide an image display apparatus which can realize a high quality body color with respect to the color of the entire visible light region and improve contrast by adjusting the transmittance.

Figures 1a to 1e is a graph showing the characteristics of the color spectrum of the pigment when the pigment applied to the resin.

2 is a graph showing the change in the characteristics of the spectrum according to the concentration of the pigment when the pigment is applied to the resin.

Figure 3 is a graph showing the change in body color for each color of the pigment.

FIG. 4 is a graph showing spot size change, which is a focus characteristic when the IK current is decreased.

The present invention provides an adhesive material for an image display device, wherein the adhesive material includes resin and pigment in the adhesive material for adhering the reinforcement glass to the panel on the front of the image display device.

Pigments are colored and opaque powders that are insoluble in water, oil, alcohol, and the like, and are pigments that color materials in a dispersed state of powder, and are generally divided into natural pigments, synthetic pigments, inorganic pigments, and organic pigments. Organic pigments have a clear color tone and excellent coloring power and transparency, while inorganic pigments are generally more stable than organic pigments, so that they do not change color, have good light resistance and heat resistance, but are opaque and insufficient in concentration.

In the present invention, all pigments exhibiting the color of the visible light region, which are suitable for the characteristics of the image display device and high-quality body color, can be used.

When the pigment is applied to the resin, a certain treatment must be performed to prevent the pigment from depositing on the resin and to ensure dispersibility. In other words, wetting treatment is performed to bury liquid resin around solid pigments to prevent deposition, and the pigments buried in solid state are separated by particles by physical milling and the like, and surfactants are removed. Dispersibility between particles can be ensured.

Characteristics of the image display device to which the pigment is applied to the resin are as follows.

Figures 1a to 1e is a characteristic of the color-specific spectrum of the pigment when the pigment applied to the resin. That is, since the luminance and contrast characteristics depend on the characteristics of the spectrum, it is possible to adjust the luminance and contrast by applying an appropriate pigment.

2 is a change in the characteristics of the spectrum according to the concentration of the pigment when the pigment is applied to the resin. The density is proportional to the thickness of the resin, and the brightness and contrast can be adjusted by adjusting the desired color and spectral characteristics as the same pigment by adjusting the density and thickness.

3 is a change in body color for each color of the pigment. Table 1 below shows the body color of the image display apparatus including the resin 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

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 pigment-based red pigment may be applied to a resin 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.

4 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.

When the pigment is applied, a large amount of the pigment may degrade the luminance characteristic, so it is necessary to harmonize with an appropriate body color. In this way, by adjusting the density and thickness of the panel using Clear with a 90% transmittance, the spectrum can be adjusted to bring high quality body color and contrast without deterioration of brightness, Although there is a decrease in luminance, an equal or higher luminance can be secured by increasing the G load current due to the improved IK ratio balance and improving the phosphor emission efficiency.

On the other hand, the resin to which the pigment is applied may be discolored by ultraviolet rays and heat or change properties. Therefore, in order to prevent the phenomenon, it is possible to add a UV stabilizer and a heat stabilizer to the resin to prevent discoloration and changes in physical properties of the pigment. As the UV stabilizer, benzophenonephenol, benzotriazole phenol, and the like may be used, and as the heat stabilizer, Ba (OCOR) ₂ , Cd (OCOR) ₂ , ROCO (CH ₂ ) ^n, or the like may be used.

Hereinafter, preferred embodiments of the present invention will be described.

The pigment was milled after wetting using a red organic pigment and uniformly dispersed in the resin. At this time, resins were acrylates, and ultraviolet rays used relatively long wavelength lamps having a wavelength of 400 nm.

The resin was defoamed for at least 5 hours, and a release agent was applied to the panel surface for ease of separation during the delamination.

The reinforcement glass was washed and the resin was injected in between to maintain the gap between the reinforcement glass and the bulb. The injection pressure was 1.4 to 1.8 Kgf / cm ² , and the injection time was 40 to 60 seconds. The injection time was reduced by using a heater in the vacuum pump and the inlet.

Thereafter, temporary curing was performed for 15 seconds at a lamp intensity of 400 W and a lamp wavelength band of 400 to 450 nm, and main curing was performed for 4 minutes and 15 seconds at a lamp intensity of 400 W and a lamp wavelength band of 400 to 450 nm after the first inspection.

As a result, the panel of the image display device and the reinforcement glass were laminated with an ultraviolet curing resin to which 0.015% of the red organic pigment was applied, and the thickness of the cured resin was 1.2 mm.

The results of the characteristics of the image display apparatus (here, CRT) according to the present embodiment and the comparison with the conventional products are shown in Table 2 below.

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

As described above, in the case of the embodiment according to the present invention, the ratio of R / G and R / B, which is a mismatching standard for R.G.B to R.G.B, was improved by 20% and 16%, respectively. In addition, the current overloaded on the R side was distributed to the G-side where the light emission intensity was high, resulting in a 2.3% increase in luminance compared to conventional products, and an increase in contrast by 11% as the resin's transmittance was controlled.

According to the present invention, since the spectral color changes according to the type and concentration of the pigment, the characteristics of the image display apparatus can be adjusted through these adjustments to secure various high-quality body color and IK current balances, and contrast and color Can be improved.

In addition, UV stabilizers and heat stabilizers may be added to maintain the color and properties of the pigment to prevent discoloration and to improve productivity by eliminating quality defects.

Claims (4)

An adhesive material for adhering a reinforcing glass to a panel on a front surface of an image display device, wherein the adhesive material comprises a resin and a pigment. The method of claim 1, The resin is an adhesive material of the image display device, characterized in that the ultraviolet curable resin. The method according to claim 1 or 2, The adhesive material may include an ultraviolet stabilizer and a heat stabilizer in addition to the resin and the pigment. The method of claim 3, wherein The ultraviolet stabilizer is benzophenone phenol or benzotriazole phenol, and the thermal stabilizer is any one selected from the group consisting of Ba (OCOR) ₂ , Cd (OCOR) ₂ , ROCO (CH ₂ ) ⁿ . Adhesive material of the device.