KR101088032B1 - Display apparatus of which diplay filter contacts with panel assembly - Google Patents

Abstract

A display device is provided. The display device includes a transparent front substrate and a rear substrate coupled to face each other, a panel assembly including a plurality of cells between the front substrate and the rear substrate, and a display filter that is closely attached to the panel assembly or spaced apart by 2.1 mm or less. Include. The display filter may include a filter base having at least one of a near infrared shielding function, a neon light shielding function, an electromagnetic shielding function, a color correction function, an antireflection function, and a panel protection function, a panel formed on one surface of the filter base and facing the filter base. A light converging portion consisting of a plurality of micro lenses focusing the visible light generated from the assembly, formed in the filter base or on the other surface of the filter base and at a position corresponding to the portion except the portion where the visible light is focused by the light converging portion And a display filter including an external light shield to prevent external light from flowing into the panel assembly.

PDP device, PDP filter, light condenser, external light shield

Description

Display apparatus of which diplay filter contacts with panel assembly

1 is an exploded perspective view showing a PDP apparatus according to an embodiment of the present invention.

2A is a cross-sectional view illustrating a PDP filter included in a PDP apparatus according to an embodiment of the present invention.

2B and 2C are diagrams illustrating a PDP filter used in another embodiment of the present invention.

3A is a perspective view of a PDP apparatus according to an embodiment of the present invention.

3B is a cross-sectional view taken along line AA ′ of FIG. 3A to show that the PDP filter and the panel assembly are in close contact.

<Explanation of symbols for the main parts of the drawings>

100: cover 110: PDP filter

120: panel assembly 130: drive circuit board

140: case 250: filter base

265: external light shield 270: support

275: light condenser 280: micro lens

The present invention relates to a display device, and more particularly, to a display device in which a display filter and a panel assembly are closely arranged.

In today's high information age, photoelectronics-related components and devices are remarkably advanced and popularized. Among them, display apparatuses for displaying images are widely used for television apparatuses, monitor apparatuses of personal computers, and the like, and thinning is progressing at the same time as such displays are enlarged.

In general, a plasma display panel apparatus (PDP) can satisfy both size and thickness at the same time as a cathode ray tube (CRT), which represents a conventional display apparatus. The plasma display device displays an image using a gas discharge phenomenon, and is excellent in various display capabilities such as display capacity, brightness, contrast, afterimage, viewing angle, and the like. In addition, PDP devices are easier to be enlarged than other display devices, and are considered to be most suitable as high-quality digital televisions in the future as thin-type light-emitting display devices, and are being spotlighted as display devices that can replace CRTs.

The PDP device generates a discharge in the gas between the electrodes by a direct current or an alternating current voltage applied to the electrode, and excites the phosphor by the radiation of ultraviolet rays, which emits light.

However, due to its driving characteristics, the PDP device has a high emission amount of electromagnetic waves and near infrared rays, high surface reflection of the phosphor, and color purity of the PDP device due to the orange light emitted from the encapsulated helium (He) or xenon (Xe), which does not reach the cathode ray tube. There is this.

Therefore, electromagnetic waves and near-infrared rays generated in the PDP device may adversely affect the human body and cause malfunction of precision devices such as a wireless telephone or a remote controller. In order to use such a PDP apparatus, it is required to suppress the emission of electromagnetic waves and near-infrared rays emitted from the PDP apparatus below a predetermined value. To this end, in order to shield electromagnetic waves and near infrared rays, and to reduce reflected light and improve color purity, a PDP filter having a function such as shielding of electric vehicles, shielding near infrared rays, preventing surface reflection and / or improving color purity is employed.

Therefore, the PDP apparatus is composed of a panel assembly including a discharge cell in which gas discharge occurs, and a PDP filter shielding electromagnetic waves and near infrared rays.

If such a PDP filter is protected from heat generated in the panel assembly, and a physical-mechanical shock is applied to the PDP filter located at the outermost part of the PDP device, the impact is transmitted directly to the panel assembly and the panel assembly is damaged. To prevent this, the PDP filter and the panel assembly are integrated into the PDP device at a predetermined distance, in particular about 3 to 5 mm.

 However, in the case of a PDP filter having a light focusing unit such as a microlens in a PDP filter that has been researched and developed in recent years, if a predetermined separation distance exists between the PDP filter and the panel assembly, the light focusing by the microlens generally Considering that the panel assembly and the PDP filter are designed to be in close contact with each other, there is a problem that the focal length is blurred and the screen is not clear.

The technical problem to be achieved by the present invention is to provide a display device that can improve the sharpness of the screen by maintaining the focal length accurately by eliminating the separation distance between the display filter and the panel assembly in close contact.

Technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a display apparatus including a transparent front substrate and a rear substrate coupled to face each other, and a plurality of cells between the front substrate and the rear substrate. And a display filter in close contact with the panel assembly or spaced apart by less than 2.1 mm. The display filter may include a filter base having at least one of a near infrared shielding function, a neon light shielding function, an electromagnetic wave shielding function, a color correction function, an antireflection function, and a panel protection function, and formed on one surface of the filter base, Corresponding to a portion except for a light converging portion composed of a plurality of micro lenses focusing the visible light generated from the opposing panel assembly, and a portion formed in or on the other surface of the filter base and focused by the light converging portion. It is formed at a position to include an external light shield to prevent external light from entering the panel assembly.

According to another aspect of the present invention, there is provided a display assembly including a transparent front substrate and a rear substrate coupled to face each other, and a plurality of cells between the front substrate and the rear substrate. And a display filter in close contact with the panel assembly or spaced apart by less than 2.1 mm. Wherein the display filter is formed in, or on, a filter base having a function of at least one of a near infrared shielding function, a neon light shielding function, an electromagnetic wave shielding function, a color correction function, an antireflection function, and a panel protection function. And an external light shield having a plurality of wedge-shaped patterns that prevent external light from entering the panel assembly and totally reflect visible light generated from the panel assembly.

Specific details of other embodiments are included in the detailed description and the accompanying drawings.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

The display device used in the present invention includes a plasma display panel (PDP) device, an organic light emitting diode (OLED) device, a liquid crystal display (LCD) device, or a field emission device that implements RGB with pixels of a grid pattern. It can be applied to a large display device such as a display device, a small mobile display device such as a personal digital assistant (PDA), a small game machine display window, a mobile phone display window, and a flexible display device. In particular, the present invention can be effectively applied to outdoor display devices having strong external light and display devices installed indoors of public facilities. Hereinafter, the present invention will be described using a PDP device and a PDP filter used for convenience of description, but the present invention is not limited thereto and may be applied to the aforementioned various display devices and display filters used therein.

1 is an exploded perspective view showing a PDP device according to embodiments of the present invention.

As shown in FIG. 1, the PDP device 10 according to the exemplary embodiments of the present invention may include a case 140, a cover 100 covering an upper portion of the case 140, and a driving circuit board accommodated in the case 140. 130, a panel assembly 120 including a discharge cell in which gas discharge occurs, and a PDP filter 110.

The PDP filter 110 includes a conductive layer formed of a material having excellent conductivity on the transparent substrate, and the conductive layer is grounded to the case 140 through the cover 100. That is, before the electromagnetic wave generated from the panel assembly 120 reaches the user, it is grounded to the cover 100 and the case 140 through the conductive layer of the PDP filter 110.

Hereinafter, the PDP filter 110 will be described first, and then, the PDP device 10 including the PDP filter 110 and the panel assembly 120 will be described.

2A is a cross-sectional view illustrating a PDP filter 110 included in the PDP device 10 according to an embodiment of the present invention, and FIGS. 2B and 2C illustrate a PDP device 10 according to other embodiments of the present invention. It is sectional drawing which shows the PDP filter 110 contained.

As shown in FIGS. 2A to 2C, the PDP filter 110 includes a filter base 250, a light converging unit 275, and an external light shielding unit 265 in which a layer having various shielding functions is formed on the transparent substrate 210. It includes.

Here, the filter base 250 is formed by stacking the transparent substrate 210, the near infrared shielding layer 235, the neon light shielding layer 230, the antireflection layer 240, and the electromagnetic shielding layer 220 in any order. .

Hereinafter, the layers corresponding to the electromagnetic wave shielding function, the neon light shielding function, the near-infrared shielding function, the color correction function, and the antireflection function will be described separately as separate ones, but the present invention is not limited thereto.

In the filter base 250, a light converging portion 275 is formed on a surface of the panel assembly (see 120 of FIG. 1), that is, a surface opposite to the user side when the PDP filter 110 is mounted to the PDP device 10. .

In FIG. 2A, the light focusing unit 275 is composed of a plurality of micro lenses 280 that focus visible light generated from the panel assembly (see 120 of FIG. 1). The light condenser 275 may be directly bonded to the filter base 250, but may be combined with the filter base 250 through the support 270 as in the embodiment of the present invention illustrated in FIG. 2A. The support 270 supports the light condenser 275. In one embodiment of the present invention, the support 270 is preferably a transparent resin film having ultraviolet transmittance. As the material of the support 270, for example, polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC), or the like may be used. Of course, the support 270 may be a film having an inherent function of a filter, for example, an antireflection layer 240, a near infrared shielding layer 235, a neon light shielding layer 230, or an electromagnetic shielding layer 220.

Here, the microlens 280 means any structure capable of collecting light. As shown in FIG. 2A, in order to increase the efficiency of the visible light emitted from the discharge cells (not shown) positioned to face the lower portion of the PDP filter 110 to the outside, a position corresponding to each discharge cell (not shown) The micro lens 280 is disposed every time.

Therefore, since the light converging unit 275 focuses the visible light generated from the discharge cell (not shown), it is possible to efficiently use the same amount of light emitted from the discharge cell (not shown).

In order to effectively focus the visible light generated from the discharge cells (not shown), the microlens 280 is processed into a lens shape having a curved surface. In addition, in order to focus the visible light effectively, it is advantageous to make the micro lens 280 convex in the direction of the panel assembly (see 120 in FIG. 1).

The microlenses 280 may be formed in close contact with each other without being spaced apart from each other, or the microlenses 280 may be formed at regular intervals so as to have a separation distance from each other.

As shown in FIG. 2A, the light condenser 275 is advantageously disposed between the filter base 250 and the panel assembly located below it (see 120 in FIG. 1), but the present invention is limited to this position. May be disposed at any position within the filter base 250.

The microlens 280 of the light converging portion 275 may satisfy a structure capable of concentrating light efficiently, and it is particularly preferable to have a semi-cylindrical relief shape.

Referring again to FIG. 2A, the external light shielding portion 265 is formed on a surface opposite to the panel assembly side of the filter base 250, that is, when the PDP filter 110 is mounted to the PDP device. The external light shield 265 may be directly bonded to the filter base 250, but in one embodiment of the present invention, the external light shield 265 may be coupled to the filter base 250 through the support 260 as illustrated in FIG. 2A. have. The support 260 supports the external light shield 265. In one embodiment of the present invention, the support 260 for supporting the external light shielding portion 265 may be made of the same configuration and material as the support 270 for supporting the light converging portion 275 described above.

As illustrated in FIG. 2A, the external light shielding part 265 may be formed on the upper side of the filter base 250, that is, on the opposite side of the filter base 250 in which the light focusing part 275 is formed.

However, the light converging portion 275 may be located closer to the panel assembly than the external light shielding portion 265. The external light shield 265 may be disposed at any portion, but it is advantageous to be disposed at a portion except for a position where visible light generated from a discharge cell (not shown) is focused through the microlens 280.

That is, the external light shield 265 may be formed on one surface of the filter base 250 but may be formed inside the filter base 265.

As shown in FIG. 2A, the filter base 250 of the PDP filter 110 of the present invention has a near-infrared shielding layer 235, a neon light shielding layer 230, and an anti-reflection layer 240 on an upper surface of the transparent substrate 210. ) Is sequentially stacked and the electromagnetic shielding layer 220 is formed on the lower surface of the transparent substrate 210. However, the present invention is not limited to this stacking order.

As the distance between the external light shielding unit 265 and the light converging unit 275 approaches, the radius of curvature of the microlens 280 of the light converging unit 275 is adjusted to be small so that the visible light generated from the microlens 280 is reduced. The external light shielding portion 265 is focused on the formed portion.

The external light shield 265 may be a light shielding pattern having a stripe shape formed at predetermined intervals. At this time, the light converging portion 275 is formed to connect the visible light generated from each discharge cell (not shown) between the light shielding patterns constituting the external light shielding portion 265 by adjusting the radius of curvature of the micro lens 280. It is desirable to.

The external light shield 265 prevents external light from flowing into the panel assembly and simultaneously prevents visible light generated from a discharge cell (not shown) from being concentrated through the light condenser 275.

For example, the external light shield 265 is preferably disposed at a position corresponding to the boundary of each micro lens 280 of the light condenser 275.

In addition, preferably, the pitch L1 of the external light shielding portion 265 and the pitch L2 of the light focusing portion 275 may be the same. In one embodiment of the present invention, the shape of the external light shielding portion 265 is sufficient to prevent the inflow of external light and prevent the visible light from being focused by the light converging portion 275 and the shape of the light shielding pattern mentioned above. It is not limited to.

2B and 2C are diagrams illustrating a PDP filter 110 used in other embodiments of the present invention, in which the same reference numerals denote the same members as those of FIG. 2A, and specifically, FIGS. 2B and 2C. The PDP filter according to the present invention does not have a lens-type light concentrator (see 275 in FIG. 2A), and instead, the external light shield 265 is not a stripe pattern but has a wedge, that is, a triangle or an inverted triangle in cross section. There is a difference in that it is in the form of a pattern with a polygonal shape. The polygonal exterior light shield 265 may be embossed or engraved with respect to the support 260.

That is, when the external light shielding portion 265 is formed in a wedge shape, total reflection occurs at a pointed lower surface of the wedge-shaped external light shielding portion 265 even though the light converging portion (275 in FIG. 2A) is not provided. Will reduce.

As shown in FIGS. 2B and 2C, the PDP filter 110 including the wedge shaped external light shielding part 265 may also be coupled to the panel assembly 120 at a close distance of not more than 2.1 mm.

The reason is that the shape of the wedge pattern of the wedge shaped external light shield 265 and the degree of inclination of the wedge shape are designed based on the close contact between the panel assembly 120 and the PDP filter 110. In order to form the wedge-shaped outer light shield 265 is formed in close contact with the PDP filter 110 and the panel assembly 120, it is preferable not to exceed the separation distance as much as 2.1mm maximum.

It has not only a PDP filter having a wedge shaped external light shield 265 having a cross-sectional shape in reverse triangle shown in FIG. 2B, but also a wedge shaped external light shield 265 having a triangular cross section shown in FIG. 2C. This is true for all PDP filters.

In FIG. 2B and FIG. 2C, the external light shielding part 265 is disposed on the outermost layer, that is, on the opposite side of the panel assembly 120, but is not limited thereto and may be located at any position inside the PDP filter.

The above has described the PDP filter 110 according to an embodiment of the present invention. Hereinafter, a PDP device using the PDP filter 110 will be described.

3A is a perspective view of a PDP apparatus according to an embodiment of the present invention. 3B is a cross-sectional view taken along line AA ′ of FIG. 3A to show that the PDP filter and the panel assembly are in close contact.

As shown in FIGS. 3A and 3B, a PDP device according to an embodiment of the present invention includes a PDP filter 110 and a panel assembly 120.

Since the PDP filter 110 is the same as mentioned above, the panel assembly 120 will be described in detail below.

As shown in FIG. 3A, a plurality of sustain electrodes 315 are disposed on the surface of the front substrate 310 in a stripe shape. Bus electrodes 320 are formed on each sustain electrode 315 to reduce signal delay.

The dielectric layer 325 is formed on the surface where the sustain electrode 315 is disposed to cover the whole. A dielectric protective film 330 is formed on the surface of the dielectric layer 325.

On the other hand, a plurality of address electrodes 340 are arranged in a stripe shape on a surface of the rear substrate 335 facing the front substrate 310. The arrangement direction of the address electrode 340 is a direction crossing the storage electrode 315 when the front substrate 310 and the rear substrate 335 are disposed to face each other. The dielectric layer 345 is formed to cover the entire surface on which the address electrode 340 is disposed. On the surface of the dielectric layer 345, a plurality of partition walls 350 protruding toward the front substrate 310 while being parallel to the address electrode 340 are provided. The partition wall 350 is disposed in an area between the neighboring address electrode 340 and the address electrode 340.

The phosphor layer 355 is disposed on the side surface of the groove portion formed of the neighboring partition wall 350, the partition wall 350, and the dielectric layer 345. In the phosphor layer 355, a red phosphor layer 355R, a green phosphor layer 355G, and a blue phosphor layer 355B are disposed in each groove portion partitioned by the partition wall 350.

The panel assembly 120 having the above structure basically has a light emitting principle such as a fluorescent lamp, and ultraviolet rays emitted from the discharge gas according to the discharge inside the discharge cell 360 excite the phosphor layer 355 to produce visible light. Is converted.

Hereinafter, the relationship between the panel assembly 120 and the PDP filter 110 will be described with reference to FIG. 3B.

As shown in FIG. 3B, the PDP filter 110 is disposed in close contact with an upper surface of the front substrate 310 of the panel assembly 120.

The PDP filter 110 and the panel assembly 120 are preferably arranged such that there is no separation distance, that is, a close contact with each other.

The reason for arranging the PDP filter 110 in close contact with the panel assembly 120 is that the light converging portion 275 composed of the microlenses 280 formed on one surface of the PDP filter 110 generally has the panel assembly 120 in close contact with the panel assembly 120. This is because the screen focus is formed on the surface of the PDP filter 110.

The PDP filter 110 is provided with an external light shield 265 to prevent external light from entering the panel assembly 120. The external light is mainly absorbed or reflected by the external light shield 265, thereby reducing external light passing through the front substrate 310 to excite the phosphor layer 335. Therefore, the contrast of the PDP device can be improved under the clear condition.

In addition, a light condenser 275 is formed on the surface of the PDP filter 110 facing the panel assembly 120 to focus visible light generated from the discharge cell 360 and to emit the light to the outside, thereby reducing the loss of light. As a result, the luminance of the PDP device can be improved.

As shown in FIG. 3B, when the light condenser 275 according to an embodiment of the present invention is a semi-cylindrical type, the light condenser 275 and the partition wall 350 may be disposed in parallel. More preferably, the boundary portion of the microlens 280 is disposed at a position corresponding to the partition wall 350 so as to focus the visible light. In one embodiment of the present invention, the pitch L3 of the partition wall 350 is preferably an integer multiple of the pitch L2 of the light converging portion 275. Therefore, it is preferable for one or more micro lenses 280 to correspond to the unit discharge cell 360 to focus visible light.

Although the PDP device having the PDP filter having the microlenses has been described above, it is preferable that the PDP filter 110 and the panel assembly 120 are arranged in close contact with each other or disposed at a distance of 2.1 mm or less. It is also applied when the PDP filter 110 having the wedge shaped external light shield of FIGS. 2B and 2C is coupled to the panel assembly 120.

Hereinafter, a concrete experimental example will be described in which forming the panel assembly 120 and the PDP filter 110 in close contact with each other or at intervals of 2.1 mm or less is advantageous in terms of sharpness and contrast ratio. However, even if the content is not described herein, those skilled in the art can be inferred, so description thereof will be omitted.

Table 1 is in close contact with the PDP filter 110 and the panel assembly 120 having a wedge-shaped external light shield, and the brightness of the white and black parts were measured using a CCD (Charge coupled Device) camera while increasing the separation distance. It shows the result of measuring MTF.

In this case, MTF is an abbreviation of Modulation Transfer Function, which is a video focus test for measuring the contrast ratio of adjacent black and white lines with one pixel width. The higher the MTF value, the faster the resolution of the interface between black and white lines. It means higher.

According to the present invention, when the MTF value is set to 43% as a specification and has an MTF value of 43% or less, the maximum separation distance between the PDP module and the PDP filter is determined with the criterion that the sharpness decreases and is inappropriate for realizing an image. The experiment was conducted on the basis of setting.

As shown in Table 1, the MTF value was measured while changing the separation distance by about 0.1mm. As a result, it was confirmed that the MTF value was 43.0% when the separation distance was 2.10mm.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments and can be manufactured in various forms, and a person of ordinary skill in the art to which the present invention belongs. It will be appreciated that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

As described above, according to the display device according to the present invention, the focus of the visible light generated from the panel assembly is accurately formed on the surface of the display filter, thereby making the display device clearer as a whole.

Claims (8)

A panel assembly including a transparent front substrate and a rear substrate coupled to face each other and a plurality of partitions partitioning a space between the front substrate and the rear substrate; And A display filter adhered to the panel assembly or spaced apart by less than 2.1 mm, The display filter, A filter base having a transparent substrate and having at least one of a near infrared shielding function, a neon light shielding function, an electromagnetic wave shielding function, a color correction function, an antireflection function, and a panel protection function; A light concentrating portion formed on one surface of the filter base and composed of a plurality of micro lenses for focusing visible light generated from the panel assembly facing the filter base; External light which is formed in the filter base or on the other surface of the filter base and is formed at a position corresponding to a portion other than a portion where the visible light is focused by the light converging unit, thereby preventing external light from flowing into the panel assembly. Including a shield, The pitch of the partition wall has an integer multiple of the pitch of the light converging portion and the pitch of the external light shielding portion, the boundary portion of the micro lens and the external light shielding portion is formed at a position corresponding to the partition wall. delete The method of claim 1, The external light shielding portion is a display device, characterized in that the light shielding pattern of the black stripe form. The method of claim 1, And the light focusing unit is a half cylinder type. The method according to claim 1 or 4, And the light converging portion has an embossed shape. The method of claim 1, The plurality of micro lenses are arranged in close contact with each other, or are arranged spaced apart from each other. A panel assembly including a transparent front substrate and a rear substrate coupled to face each other and a plurality of partitions partitioning a space between the front substrate and the rear substrate; And A display filter adhered to the panel assembly or spaced apart by less than 2.1 mm, The display filter, A filter base having a transparent substrate and having at least one of a near infrared shielding function, a neon light shielding function, an electromagnetic wave shielding function, a color correction function, an antireflection function, and a panel protection function; An external light shield formed in the filter base or on the filter base, the external light shield having a plurality of wedge-shaped patterns for preventing external light from entering the panel assembly and totally reflecting visible light generated from the panel assembly; The pitch of the partition wall has an integer multiple of the pitch of the outer light shielding portion, characterized in that the outer light shielding portion is formed in a position corresponding to the partition wall. The method of claim 7, wherein The wedge-shaped pattern is a display device, characterized in that the cross section has the shape of a triangle or inverted triangle.

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