KR20000045832A - Cathode ray tube panel structure having coating type color filter - Google Patents

Abstract

PURPOSE: A cathode ray tube panel structure having a coating type color filter is provided to coat the outer perimeter of the RGB fluorescent particle with a nano particle with a size less than 100μm. CONSTITUTION: A cathode ray tube panel structure having a coating type color filter includes an RGB fluorescent member(3,5,7), a black matrix(9), and a panel glass(11). The size of the particles of the RGB fluorescent member(3,5,7) is in the range of 5μm to 10μm. The RGB fluorescent member as well as the black matrix(9) are applied on the panel glass(11). A pigment cushion particle(10) is coated on the outside of the particle(2) of the RGB fluorescent member. The size of the pigment cushion particle is much smaller compared with the particle of the fluorescent member.

Description

Crt panel structure with coating type color filter

The present invention relates to a CRT panel structure, and more particularly, in a CRT screen in which phosphor RGB having a particle size of 5 μm to 10 μm is applied to a panel glass, a black matrix is applied to the panel glass of about 100 nm or less. Coating color filter made of pigment powder composed of high purity and high permeability ultra fine particles to remove unnecessary band of light for the desired light emission wavelength by applying fine pigment coated phosphor RGB and to increase light transmission by increasing the selection efficiency. It relates to a CRT panel structure having a.

In general, a CRT is a display device that focuses electrons emitted from a cathode enclosed in a tube and then accelerates them to make an electron beam and control its direction by the action of an electric field or a magnetic field.

Referring to FIG. 1 attached to the structure of the above-described CRT, the temperature of the cathode 120 is increased by generating heat by receiving RGB signals, ie, amplified images of red, green, and blue. The main unit 110 modulates the luminance (brightness change) by adjusting the heater 110, the cathode 120 which emits electrons when a negative voltage is supplied from the heater 110, and the amount of electrons emitted from the cathode 120. The control grid 130 and the cathode 120 to supply a constant voltage (eg, + 110V to 400V) so that electrons emitted from the cathode 120 can reach the fluorescent layer 192 at the rear of the panel 190. An acceleration grid 140 that attracts electrons and accelerates them in the axial direction, and a medium acceleration grid that accelerates electrons that are accelerated primarily by the acceleration grid 140 to supply a predetermined voltage (for example, +10 mA or more). And electrons emitted from the cathode 120 and moved toward the fluorescent layer 192 of the panel 190. Focusing grid 160 to make thinner electron beams to diffuse by the repulsive force to each other, and electrons emitted from the cathode 120 accelerated twice through the acceleration grid 140, the medium acceleration grid 150 Supply a constant voltage (e.g., + 10㎸ or more) to the super acceleration grid 170 to accelerate the third order to collide with the phosphor layer (192) of the glass panel 190, and a constant voltage (e.g. + An anode terminal 180 for supplying a high voltage of 10 kV or more to the aluminum layer of the fluorescent layer 192 of the glass panel 190 and discharging the high voltage when the power is "off" is provided.

In addition, in the case of the color CRT, the electron gun has three RGB electron guns, which are largely classified into a delta type and an inline type according to the arrangement of the electron guns. In the tank gun in the CRT, each beam of RG B is deflected by deflection yoke coils and crosses the slit of the shadow mask to hit the RGB fluorescent layer of the glass panel. Will diverge.

In addition, in recent years, with the spread of OA devices and portable small TVs, liquid crystal displays (LCDs), electroluminescent (EL) devices, plasma displays (PDPs), and fluorescent display tubes (VFDs) have been used instead of CRTs. Research is being actively conducted, and the dual liquid crystal display is extremely lightweight, thin, low cost, low power consumption, and has good characteristics with integrated circuits, so it can be used as a lap top computer or a pocket computer. In addition to the display of a pocket computer, its use is rapidly expanding for vehicle loading and color TV images.

The liquid crystal panel includes a lower substrate on which thin film transistors, which are individual switching elements, are formed, that is, a TFT substrate, a liquid crystal layer, and three color filter layers of red, green, and blue. It consists of an upper board which is arranged repeatedly to colorize.

The invention disclosed in Korean Patent Application No. 95-4971 has been proposed as a structure and a manufacturing method of such a conventional color filter for liquid crystal display. The color filter for the liquid crystal display will be described with reference to FIGS. 2 and 3A to 3H.

As shown in FIG. 3A, a light blocking black matrix 214 is formed on the substrate 201 by treating the chromium with a thickness of 1000 to 2000 GPa for sputtering to prevent degradation of the TFT and improve contrast.

Thereafter, a negative photoresist having optimized spectral characteristics, for example, a red colored acrylic photosensitive resin 202 having a pigment dispersed thereon, is 1.0 to 2.0 μm in FIG. 3B on a substrate 201 having a black matrix 214 made of chromium. Apply as shown, soft-baked for 90 seconds on a hot plate of 60 to 110 degrees Celsius, and then on a colored film already formed with a water-soluble resin such as an oxygen barrier film 203 to prevent oxidation of the resist generated during exposure. After application drying, as shown in FIG. 3D, exposure 204 is performed with ultraviolet rays as shown in FIG. 3D.

After exposure, as shown in FIG. 3E, the oxygen barrier film 203 is peeled off for 1 to 2 minutes with DIW, then developed for 2 to 3 minutes with a developer, and then rinsed and dried for 1 to 2 minutes with DIW. Finally, the first color filter layer 205 having the optimized red spectral characteristics is formed by hard baking at a temperature of 180 to 230 degrees Celsius for 10 to 30 minutes in the baking oven as shown in FIG. 3f. As illustrated, a second color filter layer 208 and a third color filter layer 211 having green spectral characteristics are formed on the black matrix 214 to be separated from the first color filter layer 205.

Then, on the black matrix 214 and the color filter layers 205, 208 and 211, the protective film 212 for the purpose of flattening and protecting the RGB colored film is, for example, a transparent resin such as polyimide, polyacrylate, polyurethane or the like. To form a thickness of about 1 to 2㎛ and then heated to 150 to 220 ℃ for 30 minutes to 60 minutes in a hot bake oven to form as shown in Figure 3g.

Next, the color filter is completed by sputtering the ITO common electrode film 213 on which the voltage for driving the liquid crystal is applied on the entire surface of the protective film 212 to a thickness of about 500 to 2000 mW.

On the other hand, a color filter applied to a CRT such as a high-definition TV to improve contrast without lowering the brightness is generally a common outer filter such as AG / AR on the outer face of the face plate, as shown by reference numeral 300,301,302 in FIG. 4. In addition to the above, the black matrix 303 and the tricolor fluorescent layers 305, 307, and 309 are provided to correspond to RGB, respectively.

Here, the black matrix 303 is mainly used as black pigment, graphite particles as black particles. The common outer surface filter formed on the outer surface of the face plate is designed to face the RGB filters of the color filter layers 300, 301 and 302 in common, and is formed of silicon containing organic pigments or dyes.

Accordingly, the common outer color filters 300, 301, and 302 are formed between the black matrix 303 to selectively absorb external light of high visibility band and transmit light of different bands, and correspond to each RGB tricolor filter corresponding to the RGB tricolor fluorescent layer. The blue filter 300 mainly transmits the spectral wavelength light emitted from the blue phosphor, and transmits the spectral wavelength light of the green and red light, and the green filter 301 emits the spectral wavelength of the green phosphor. It transmits light and spectral light of another band, and the red filter 302 also transmits spectral wavelength light of a red phosphor and spectral wavelength light of another band.

By the way, according to the CRT panel structure as described above, the wavelength selection efficiency can be improved by eliminating unnecessary band light among the wavelengths emitted to the RGB light emitting device, but the visibility of contrast and luminance is poor, and the pigment particles are relatively assembled. Since the light transmittance is not high and relatively thick, there is a problem that the transmittance is also lowered.

In addition, a blue color filter as shown in FIG. 5 has been proposed to solve the above problems.

The CRT panel structure employing such a blue color filter is similarly coated with a carbon matrix black matrix 403 on the glass panel 401, and forms red, green, and blue tricolor fluorescent layers 405, 407, and 409, and then a metal plate 411. A blue color filter 413 is formed between the blue phosphor 409 and the glass panel 401 so as to reduce the reflectance of the blue phosphor 409.

Such a panel structure can thus obtain an effective color by absorbing the most visible wavelength, that is, a wavelength of 530 to 630 nm, can improve 23% of brightness and 8% of contrast, and does not increase the maximum cathode driving bolt. Without increasing the current ratio of the cathode.

In addition, whether the panel glass is used to increase the brightness, or if the effective area of the light emitting surface is increased, or the current and voltage are increased in the circuit, and the brightness is increased to increase the contrast and the reflectance of the fluorescent surface itself is low. In addition, although the surface reflectance was lowered, the light transmittance of the color filter could not be increased to a satisfactory level, and thus there was a problem in that it was not possible to meet the increasing demand for sharpness of CRT image quality of consumers.

Accordingly, the present invention has been made to solve the problems of the above-mentioned conventional CRT panel structure, the RGB fluorescence surrounded by pigment powder of fine particles of about 100㎛ or less on the back of the panel glass coated with a black matrix By applying a layer to remove unnecessary bands of light other than the desired light emission wavelength, the purpose of the present invention is to increase the light transmittance by increasing the selection efficiency, thereby improving luminance, contrast, and color purity.

1 is a diagram illustrating a configuration of a general CRT.

2 is a cross-sectional view showing the structure of a color filter for a liquid crystal display according to the prior art.

3A to 3H are cross-sectional views showing a procedure of manufacturing a color filter for a liquid crystal display according to the prior art.

4 is a schematic cross-sectional view of a CRT panel structure according to the prior art.

5 is a schematic cross-sectional view of a CRT panel structure with a blue color filter.

6 is a schematic cross-sectional view of a CRT panel structure having a coated color filter according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Panel structure 3,5,7: RGB fluorescent layer

9: black matrix

In order to achieve the above object, the present invention provides a CRT panel structure in which an RGB phosphor having a particle size of 5 µm to 10 µm is coated on a panel glass together with a black matrix, wherein each RGB phosphor particle has a relative value compared to RGB phosphor particles. In order to provide a CRT panel structure in which pigment particles having very small microparticles are coated around the phosphor particles.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the CRT panel structure according to the present invention, as shown in FIG. 6, a black matrix 9 is coated on the inside of the panel glass 11 as in the conventional panel structure, and a tricolor fluorescent layer ( 3, 5, and 7 are applied alternately in the order of RGB, wherein the particles 2 of the phosphor constituting the phosphor layers 3, 5, and 7 have a diameter of 5 μm to 10 μm.

Here, the microparticle pigment particles 10 having a diameter relatively smaller than the diameter of the particles 2 are coated around each of the RGB phosphors 3, 5, 7 particles 2. This pigment particle 10 is an ultrafine particle having a diameter of about 100 nm so as to surround the outer circumferential surface of each phosphor particle 2.

The trichromatic phosphors 3, 5, and 7 coated with the fine particle pigment particles 10 are coated on the rear surface of the black matrix 9, and the structures of the fluorescent layers 3, 5 and 7 have a thickness of 5 to 5, respectively. The black matrix 9 having a thickness of about 20 μm, formed of black pigment on the face inner surface, has a thickness of 0.5 to 1.0 μm, and the average particle size of the black pigment powder used is about 0.2 to 0.5 μm. . The common outer filter formed on the outer face of the face plate is designed to face the RGB filters of the color filter layers 13, 15 and 17 in common, and is formed of silicon containing organic pigments or dyes.

The common outer surface filter has a maximum absorption in the wavelength range of 500 to 600 nm, more specifically, the 575 ± 20 nm band with the best visibility of the human eye, and has a transmittance of 50 to 90% for the wavelength light in this band. Therefore, the common outer surface filter selectively absorbs external light of a high visibility band and transmits light of another band.

Therefore, according to the CRT panel structure 1 according to the present invention, the temperature of the cathode is increased by generating heat by receiving an image-amplified RGB signal, and electrons are emitted from the cathode when a negative voltage is supplied from the heater. . The amount of electrons emitted from the cathode is controlled by the control grid to determine the luminance, and the electrons emitted from the cathode can reach the fluorescent layers 3, 5, and 7 at the back of the panel 1, for example, It is attracted by the acceleration grid to a constant voltage of 110V to 400V and accelerated in the axial direction. The electrons accelerated primarily in the acceleration grid are secondary accelerated by a medium acceleration grid to a constant voltage of, for example, +10 mA or more.

The electrons that are emitted from the cathode and move toward the fluorescent layers 3, 5, and 7 of the panel 1 and diffuse due to mutual repulsive forces are concentrated in the axial direction by the focusing grid to form a thin electron beam. The electrons accelerated twice while passing through the inner grid are supplied with a constant voltage of +10 가 or more, for example, and are accelerated in the third order by the super-accelerated grid to impinge on the fluorescent layers 3, 5 and 7 of the panel glass 11, thereby providing RGB light. Will radiate.

At this time, since the three-color fluorescent layer (3, 5, 7) is coated and surrounded by 100 nm ultrafine pigment particles (10), each wavelength of the light emitted from the three-color fluorescent layer (3, 5, 7) is red (R) Selection of the wavelength by removing unnecessary bands of light for a desired emission wavelength in which the fluorescent layer 3 is 627 nm, the green (G) fluorescent layer 5 is 530 nm, and the blue (B) fluorescent layer 7 is 450 nm The efficiency can be improved, and thus the light transmittance through each of the fluorescent layers 3, 5, and 7 is increased.

As described above, according to the CRT panel structure of the present invention, in applying the RGB fluorescent layer to the rear surface of the panel glass coated with the black matrix, pigment powder particles made of ultra fine particles of about 100 μm or less are coated on the outer peripheral surface of the RGB fluorescent particles. By removing light in an unnecessary band other than the desired light emission wavelength, the light transmittance of the fluorescent layer can be increased to increase the brightness, contrast and color purity of the screen.

While the invention has been shown and described with respect to particular embodiments, those skilled in the art will recognize that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can easily know.

Claims (2)

In the CRT panel structure (1) in which the RGB phosphors (3, 5, 7) having a particle size of 2 to 5 µm are coated on the panel glass 11 together with the black matrix 9, the respective RGB Around the particles of phosphors 3, 5 and 7, pigment particles 10 made of microparticles having a relatively small size compared to the particles of RGB phosphors 3, 5 and 7 are formed. 7) CRT panel structure, characterized in that the coating is coated around the particle (2). The CRT panel structure according to claim 1, wherein the pigment particles (10) are made of fine particles of 100 nm.