KR20100003858A - Display filter and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A display filter and a manufacturing method thereof are provided to simplify a manufacturing process by forming a light-shield pattern on both sides of a base unit. CONSTITUTION: A plurality of first light-shield patterns(520a) are located on an upper side of the base unit(510). The space between first light-shield patterns is filled with a first transparent resin(530a). A plurality of second light-shield patterns(520b) is located at the lower-part of the base unit. The space between second light-shield patterns is filled with the second transparent resin(530b). The first light-shield pattern and the second light-shield pattern are symmetrical and the base unit is located between them. The surface of the first light-shield pattern and the surface of the first transparent resin are on the same plane while the surface of the second light-shield pattern and the surface of the second transparent resin are the same plane.

Description

Display Filter and Manufacturing Method Thereof

A display filter used in the display device of the present invention and a method of manufacturing the same.

BACKGROUND ART In general, a plasma display panel is a flat panel display that displays an image or information using light emission by plasma discharge. The plasma display panel is classified into a DC type and an AC type according to a panel structure and a driving method.

The plasma display panel generates a plasma discharge inside the discharge cells separated by the partition walls, and when the ultraviolet rays generated by the discharge of gases such as He and Xe injected into each discharge cell excite the phosphor to return to the ground state. A display device using a light emission phenomenon of visible light generated by energy difference.

The plasma display panel has an advantage of realizing a large screen of 40 inches or more, in addition to the ease of fabrication due to a simple structure, excellent brightness and high luminous efficiency, a memory function, and a wide viewing angle of 160 degrees or more.

However, the plasma display panel has high emission amount of electromagnetic waves and near infrared rays due to its driving characteristics, high surface reflection of the phosphor, and color purity of the cathode ray tube (CRT) due to orange light emitted from He and Xe injected into each discharge cell. There is a disadvantage.

Therefore, in order to shield electromagnetic waves and near infrared rays, while reducing reflected light and improving color purity, filters having functions such as electromagnetic shielding, near infrared shielding, light surface reflection prevention and color purity improvement are employed. Since the filter is mounted on the front of the panel, transparency must be satisfied.

On the other hand, in the plasma display panel, in an external bright condition, external light may pass through the filter and flow into the panel. In this case, superposition of light generated in the discharge cells in the panel and external light introduced through the filter from the outside occurs. As a result, the contrast ratio is lowered, resulting in poor screen display capability of the plasma display panel.

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 a display filter and a method of manufacturing the same that can improve the brightness and contrast ratio of a display panel.

In order to achieve the above object, the display filter according to an embodiment of the present invention is a base portion, a plurality of first light-shielding pattern positioned on the upper surface of the base portion, the first transparent positioned between the plurality of first light-shielding pattern The resin may include a plurality of second light blocking patterns positioned on the bottom surface of the base part and a second transparent resin positioned between the plurality of second light blocking patterns.

In addition, the method of manufacturing a display filter according to an embodiment of the present invention is the step of applying a photosensitive transparent resin on both sides of the base portion, by performing a photolithography method on the photosensitive transparent resin a plurality of first transparent resin and a plurality of second Simultaneously forming a transparent resin and coating a photosensitive black resin on both surfaces of the base portion on which the plurality of first transparent resins and the plurality of second transparent resins are formed to form a first light blocking pattern and a second light blocking pattern. can do.

The display filter and the manufacturing method thereof according to the present invention has an advantage of improving the brightness and contrast ratio of the display panel.

In addition, the display filter and the method of manufacturing the same according to the present invention has an advantage that can simplify the process, reduce the manufacturing cost and improve the productivity.

Hereinafter, a display filter and a manufacturing method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1A to 1C, the plasma display panel 100 may include an upper substrate 200, a lower substrate 300, and a display filter 420.

In the upper substrate 200 of the plasma display panel 100, a transparent electrode 220, a bus electrode 230, an upper dielectric layer 240, and a protective layer 250 may be disposed below the first substrate 210. .

The transparent electrode 220 may be made of transparent indium tin oxide to transmit light supplied from the discharge cell.

The bus electrode 230 is positioned below the transparent electrode 220 and reduces the line resistance of the transparent electrode 220.

The bus electrode 230 may be formed of silver (Ag) having high conductivity, and thus the bus electrode 230 may be formed of a material having high conductivity, thereby reducing the driving voltage of the transparent electrode 220 having low conductivity. .

The upper dielectric layer 240 is a layer in direct contact with the bus electrode 230 made of a metal material, and may be made of glass to avoid chemical reaction with the bus electrode 230.

The upper dielectric layer 240 maintains a glow discharge by limiting the discharge current, and the charge generated during the plasma discharge is accumulated.

The passivation layer 250 prevents damage to the upper dielectric layer 240 due to sputtering during plasma discharge and increases discharge efficiency of secondary electrons. The passivation layer 250 may be made of magnesium oxide (MgO).

In the lower substrate 300 of the plasma display panel 100, an address electrode 320, a lower dielectric layer 330, a partition 340, and a fluorescent layer 350 may be positioned on the second substrate 310. .

The address electrode 320 is located at the center of each discharge cell. The address electrode 320 has a line width of about 70 to 80 μm.

The lower dielectric layer 330 is positioned in front of the address electrode 320 and the lower substrate 310 and protects the address electrode 320.

The partition wall 340 is formed above the lower dielectric layer 330 and is spaced apart from the address electrode 320 by a predetermined distance, and has a longer shape in the vertical direction.

The partition wall 340 may maintain a discharge distance and may serve to prevent electrical and optical interference between adjacent discharge cells.

The fluorescent layer 350 is positioned on both sides of the barrier rib 340 and the upper portion of the lower dielectric layer 330.

The fluorescent layer 350 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red (R), green (G), and blue (B).

Next, the display filter 420 is disposed above the first substrate 210 of the upper substrate 200. As shown in FIG. 1A, the display filter 420 may be disposed to be spaced apart from or in contact with the first substrate 210, and foreign matter may flow between the upper substrate 200 and the display filter 420. And may be combined with the adhesive 500, as shown in FIG. 1C to prevent and reinforce the strength of the display filter 420 itself.

Unlike the foregoing, referring to FIG. 1B, the plasma display panel according to the exemplary embodiment may further include a functional layer 410 on the display filter 420.

The functional layer 410 may include an antireflection layer 416 and an electromagnetic shielding layer 414 formed on the transparent substrate 412, and may further include a color correction layer 430.

The electromagnetic wave shielding layer 414 may be a layer that reflects or absorbs electromagnetic waves, and may use a conductive mesh film or a multilayer transparent conductive film in which a metal thin film and a high refractive index transparent film are laminated. In one embodiment of the present invention, the electromagnetic shielding layer 414 is formed on one surface of the transparent substrate 412, that is, the surface adjacent to the upper substrate 200, but is not limited thereto.

The conductive mesh film may be a metal coating on a mesh of grounded metal mesh, synthetic resin or metal fiber.

The multilayer transparent conductive film may be a high refractive transparent thin film represented by ITO.

In order for the electromagnetic wave shielding layer 414 to effectively absorb electromagnetic waves generated between the upper substrate 200 and the lower substrate 300, the conductive metal thin film should be formed to have a predetermined thickness or more, but the conductive metal thin film has a thick thickness. The higher the quality, the lower the visible light transmittance. However, the multilayer transparent conductive film laminated alternately with the conductive metal thin film using the high refractive index transparent thin film can increase the reflection interface and increase the reflection of electromagnetic waves.

The anti-reflection layer 416 may be formed on one surface of the transparent substrate 412, that is, on the opposite surface of the upper substrate 200. The antireflection layer 416 improves visibility by reducing reflection of external light.

The antireflection layer 416 may be formed using a fluorine-based transparent polymer resin having a refractive index of 1.5 or less with respect to visible light, a thin film of magnesium fluoride, a silicon resin, or silicon oxide.

Meanwhile, the functional layer 410 may further include a near infrared shielding layer (not shown) that shields the near infrared rays generated from the panel.

The functional layer 410 may further include a color correction layer 430 having a transmittance of 60% or more in the wavelength range of 580 to 600 nm. The color correction layer 430 changes or corrects the color balance by reducing or adjusting the amounts of red, green, and blue.

Generally, red visible light generated from the plasma in the panel tends to appear orange. Therefore, the orange color is represented as red using the color correction layer 430.

On the other hand, the orange is strongly emitted from the panel, because the light emitted from the plasma itself and the external light is reflected back from the panel tends to have an orange color.

In an embodiment of the present invention, the color correction layer 430 is formed to block external light from entering the panel, thereby essentially reducing the amount of orange light.

Hereinafter, the light emission operation of the plasma display panel will be described.

When a constant voltage is applied between the transparent electrode 220 and the bus electrode 230, when an additional voltage capable of generating plasma is applied to the address electrode 320, the bus electrode 230 and the bus electrode 230 adjacent to the bus electrode 230 are applied. Plasma is formed between them. There is a certain amount of free electrons in the gas. When the electric field is applied, the free electrons receive a force (F = qE).

When these energized electrons get enough energy to remove the outermost electrons of the inert gases, they ionize the gas, and the ions and electrons generated here move to both electrodes under the force of the electromagnetic field. In particular, when ions collide with the protective layer 250, secondary electrons are generated in the protective layer 250, which helps the formation of plasma.

Therefore, a high voltage is required to start the initial discharge, but once discharged, the electron density increases and a low voltage is required.

Gases injected into the plasma display panel are mainly inert gases such as Ne, Xe, and He. In particular, ultraviolet rays having wavelengths of 147 nm and 173 nm, which Xe emits in a metastable state, are applied to the fluorescent layer 350 to be red, green, or blue. Allow visible light to be generated.

The visible light generated at this time is determined according to the type of the fluorescent layer 350. As a result, each discharge cell becomes a pixel displaying red, green, and blue, respectively.

The color is controlled by a combination of the R, G, and B values of each discharge cell. In the case of the plasma display panel, the plasma generation time is controlled by controlling the time at which the plasma is generated.

The generated visible light is emitted to the outside through the upper substrate 210, the display filter 420, and the functional layer 410.

Hereinafter, the display filter described above will be described in more detail.

2A and 2B are a perspective view and a cross-sectional view showing a display filter according to an embodiment of the present invention.

2A and 2B, the display filter 500 according to an exemplary embodiment may include a base part 510, a plurality of first light blocking patterns 520a positioned on an upper surface of the base part 510, and A first transparent resin 530a positioned between the plurality of first light blocking patterns 520a, a plurality of second light blocking patterns 520b disposed on a lower surface of the base part 510, and a plurality of second light blocking patterns It may include a second transparent resin (530b) positioned between the 520b.

The base part 510 may serve to maintain stability by supporting the first light blocking pattern 520a, the second light blocking pattern 520b, the first transparent resin 530a, and the second transparent resin 530b.

The base portion 510 is preferably made of a transparent material. For example, glass may be used, and as the flexible material, any one selected from the group consisting of polyethylene terephthalate (PET), polycarbonate (PC), and polyvinyl chloride (PVC) may be used. Do not.

The base portion 510 is preferably a thickness of 30 to 250㎛ to ensure the reliability and transmittance of the support.

First and second light blocking patterns 520a and 520b may be positioned on both surfaces of the base unit 510. The first light blocking pattern 520a and the second light blocking pattern 520b may be arranged in a stripe shape in one direction.

The first light blocking pattern 520a and the second light blocking pattern 520b may be formed of a black inorganic material, a black organic material, or a metal capable of absorbing light.

Since the metal has high electrical conductivity, when the first light shielding pattern 520a and the second light shielding pattern 520b are formed by adding metal powder, the electrical resistance may be controlled by adjusting the concentration of the metal powder. In addition, when the surface is black, since external light shielding and electromagnetic wave shielding functions can be efficiently implemented, carbon black may be included as a material of the first light blocking pattern 520a and the second light blocking pattern 520b. A photosensitive black resin can be used.

The photosensitive black resin may include a material in which carbon black is mixed with a thermosetting resin, a photocurable resin, or an ultraviolet curable resin.

The ultraviolet curable resin is a material containing any one selected from the group consisting of polyester, urethane, epoxy, silicone and acrylic.

The first light blocking pattern 520a and the second light blocking pattern 520b may have a predetermined width and height in consideration of light and dark contrast ratio and transmittance. To this end, the first light blocking pattern 520a and the second light blocking pattern 520b may have a width of 10 to 150 μm and preferably have a height of 3 to 150 μm.

The first transparent resin 530a and the second transparent resin 530b positioned between the first light blocking pattern 520a and the second light blocking pattern 520b may be disposed on the base part 510.

The first transparent resin 530a and the second transparent resin 530b are positioned between the first light blocking pattern 520a and the second light blocking pattern 520b disposed on the base portion 510 and are disposed on the base portion 510. The adhesive may serve to support the display filter 500.

The first transparent resin 530a and the second transparent resin 530b may use an ultraviolet curable resin that may transmit light and may be cured by ultraviolet rays. The ultraviolet curable resin may include, for example, any one selected from the group consisting of polyester, urethane, epoxy, silicone, and acrylic.

2A and 2B, the surface of the first light blocking pattern 520a and the surface of the first transparent resin 530a may be disposed on the same line, and the second light blocking pattern 520b may be disposed on the same line. ) And the surface of the second transparent resin (530b) may be located on the same line.

The first transparent resin 530a and the second transparent resin 530b may have the same width as the first light blocking pattern 520a and the second light blocking pattern 520b. Alternatively, the first transparent resin 530a and the second transparent resin 530b may have a height of 3 to 150 μm. And, it may be made of a width of 10 to 150㎛.

Meanwhile, in the display filter 500 according to an exemplary embodiment, the first light blocking pattern 520a and the second light blocking pattern 520b may be positioned perpendicular to the base portion 510.

Therefore, when incident light is incident on the first light blocking pattern 520a, when incident light enters one surface of the first light blocking pattern 520a at an angle greater than a predetermined angle θ, total reflection occurs and the first transparent resin 530a is incident. It is emitted.

In addition, a part of the incident light from the panel may be absorbed by the first light blocking pattern 520a and the second light blocking pattern 520b, and a part of the incident light may pass through the first transparent resin 530a and the second transparent resin 530b. Can be emitted to the outside.

A portion of the incident light from the panel may be totally reflected on one surface of the first light blocking pattern 520a or the second light blocking pattern 520b to be emitted to the outside to increase the transmittance of the plasma display panel.

In general, the plasma display panel preferably has a high transmittance to visible light and a high contrast ratio. Contrast ratio may be expressed as in Equation 1.

When light emitted from the panel is passed through the outside without filtration to increase the transmittance of the plasma display panel, not only the luminance of white light but also the luminance of black light is increased. Therefore, when the brightness of the plasma display panel is increased, the overall contrast ratio is relatively low.

The display filter according to an embodiment of the present invention may further include a functional layer including any one or more of an antireflection layer, an electromagnetic shielding layer, and a color correction layer. Since the description of the functional layer has been described above, it will be omitted.

Accordingly, the present invention may increase the contrast ratio of the plasma display panel by absorbing a part of the incident light 510 in the first light blocking pattern 520a and the second light blocking pattern 520b to adjust the transmission amount to visible light.

Hereinafter, the manufacturing method of the display filter of the plasma display panel described above will be described in detail.

3A to 3H are views illustrating a method of manufacturing a display filter according to an embodiment of the present invention for each process.

As shown in FIG. 3A, the transparent resin 620 is coated on both surfaces of the base part 610 to have a predetermined thickness. At this time, the transparent resin 620 may be applied in a thickness corresponding to the height of the transparent resin to be formed.

Subsequently, as illustrated in FIG. 3B, the mask 630 is positioned on the transparent resin 620 and then exposed to light for a predetermined time, and then developed.

At this time, when the transparent resin 620 is a positive type, only the transparent resin at a position corresponding to the opening formed in the mask 630 is cured, and the transparent resin of the uncured portion is removed.

In addition, since the transparent resin 620 is formed on both surfaces of the base portion 610, when the exposure and development processes are performed, the transparent resin on the bottom surface as well as the top surface of the base portion 610 may be simultaneously patterned.

Accordingly, as shown in FIG. 3C, the first transparent resin 620a may be formed on the upper surface of the base 610, and the second transparent resin 620b may be formed on the lower surface of the base 610. .

In addition, since the first transparent resin 620a and the second transparent resin 620b are simultaneously patterned, the first transparent resin 620a and the second transparent resin 620b are formed symmetrically with respect to the base part 610. Can be.

Subsequently, as illustrated in FIG. 3D, the photosensitive black resin 650 is coated on both surfaces of the base 610 on which the first transparent resin 620a and the second transparent resin 620b are formed.

As described above, the photosensitive black resin 620 may use a material in which carbon black is added to the ultraviolet curable resin.

In this case, the photosensitive black resin 650 may be applied to cover the first transparent resin 620a and the second transparent resin 620b. Accordingly, the first light blocking pattern 650a may be formed to fill the space between the first transparent resin 620a, and the second light blocking pattern 650b may be formed to fill the space between the second transparent resin 620b. have.

3E and 3F, the first transparent resin 620a is formed using a blade or a squeezer 660 on the base 610 to which the photosensitive black resin 650 is applied. ) And the photosensitive black resin 650 outside the surface of the second transparent resin 620b may be removed to form the first light blocking pattern 650a and the second light blocking pattern 650b.

In this case, the surface of the first transparent resin 620a and the surface of the first light blocking pattern 650b are positioned on the same line, and the surface of the second transparent resin 620b and the surface of the second light blocking pattern 650b are the same line. It can be formed to be located on.

Subsequently, ultraviolet rays (UV) are irradiated to the first light blocking pattern 650a and the second light blocking pattern 650b for a predetermined time to cure the first light blocking pattern 650a and the second light blocking pattern 650b.

By the above-described method, it becomes possible to manufacture a display filter in large quantities.

As described above, in the display filter of the plasma display panel, since the light shielding pattern may be simultaneously formed on both surfaces of the base part, there is an advantage that the manufacturing process may be simplified, the manufacturing cost may be reduced, and the productivity may be improved.

Meanwhile, as illustrated in FIG. 3G, an adhesive layer 670 may be further formed on the display filter as illustrated in FIG. 3F. This is effective when the display filter must be attached directly to the plasma display panel.

In addition, when storing the display filter separately, in order to prevent damage to the display filter, as shown in Figure 3h, the protective film (680a, 680b) may be further coated on the upper and lower portions of the display filter.

When manufacturing the plasma display panel using the display filter manufactured as described above, after removing the protective films 680a and 680b, the adhesive layer 670 may be attached to the upper substrate of the plasma display panel.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

1A and 1B are perspective views illustrating a plasma display panel according to an embodiment of the present invention, and FIG. 1C is a cross-sectional view taken along line II ′ of FIG. 1B.

2A and 2B illustrate a display filter according to an exemplary embodiment of the present invention.

3A to 3H are cross-sectional views illustrating a method of manufacturing a display filter according to one embodiment of the present invention.

Claims (22)

A base portion; A plurality of first light blocking patterns positioned on an upper surface of the base part; A first transparent resin positioned between the plurality of first light blocking patterns; A plurality of second light blocking patterns on the bottom surface of the base part; And And a second transparent resin disposed between the plurality of second light blocking patterns. The method of claim 1, The first light blocking pattern and the second light blocking pattern are symmetrical with respect to the base part. The method of claim 1, And a surface of the first light blocking pattern, a surface of the first transparent resin, or a surface of the second light blocking pattern and a surface of the second transparent resin on the same line. The method of claim 1, The base portion is a display filter made of glass (glass). The method of claim 1, The base unit is any one selected from the group consisting of polyethylene terephthalate (PET), polycarbonate (PC) and polyvinyl chloride (PVC). The method of claim 1, The first light blocking pattern and the second light blocking pattern include a photosensitive black resin. The method of claim 6, The photosensitive black resin includes a black inorganic material or a black organic material. The method of claim 7, wherein The black inorganic material is carbon black (carbon black) display filter. The method of claim 1, And the first transparent resin and the second transparent resin are ultraviolet curing resins. The method of claim 9, The UV curable resin includes any one selected from the group consisting of polyester, urethane, epoxy, silicone and acrylic. The method of claim 1, The display filter further includes a functional layer, And the functional layer comprises an antireflection layer or an electromagnetic shielding layer. The method of claim 11, The functional layer further comprises a color correction layer. Applying photosensitive transparent resin on both sides of the base portion; Performing a photolithography method on the photosensitive transparent resin to form a plurality of first transparent resins and a plurality of second transparent resins simultaneously; And And forming a first light blocking pattern and a second light blocking pattern by coating a photosensitive black resin on both surfaces of the base part on which the plurality of first transparent resins and the plurality of second transparent resins are formed. The method of claim 13, In the forming of the first light blocking pattern and the second light blocking pattern, And removing the photosensitive black resin coated on the surfaces of the first transparent resin and the second transparent resin. The method of claim 13, Removing the photosensitive black resin is a method of manufacturing a display filter using a blade or a squeezer. The method of claim 13, The first light blocking pattern and the second light blocking pattern are formed symmetrically with respect to the base portion. The method of claim 13, The base portion manufacturing method of the display filter is formed of glass (glass). The method of claim 13, The base portion is a method of manufacturing a display filter formed of any one selected from the group consisting of polyethylene terephthalate (PET), polycarbonate (PC) and polyvinyl chloride (PVC). The method of claim 13, The photosensitive black resin is a manufacturing method of a display filter comprising a black inorganic material or a black organic material. The method of claim 19, The black inorganic material is carbon black (carbon black) manufacturing method of the display filter. The method of claim 13, The first transparent resin and the second transparent resin is a manufacturing method of a display filter of the ultraviolet curable resin. The method of claim 21, The UV curable resin is a method of manufacturing a display filter comprising an oligomer or monomer having any one functional group selected from the group consisting of polyester, urethane, epoxy, silicone and acrylic.

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