KR20090110655A - A display filter and a liquid crystal display device comprising the same - Google Patents

Abstract

PURPOSE: A display filter and a liquid crystal display device comprising the same are provided to reflect a visible ray emitted from a panel by forming a metal reflection layer on a pattern. CONSTITUTION: A display filter includes at least one pattern part(325), a reflecting layer(330), and a film layer(335). The pattern is formed at the base part to absorb an external light. The reflecting layer is formed at least one side of the pattern part, and the film layer is formed at least one side of the base portion. The film layer includes at least one of Poly Ethylene Terephthalate and Poly methyl Meta Acrylate. The film layer including PET has a high transparency, and the film layer including PET radiates the light from the film panel.

Description

A display filter and a liquid crystal display device comprising the same

The present invention relates to a display filter and a liquid crystal display device having the same. More particularly, a reflective layer made of a metal material is formed on at least one surface of a pattern portion of a filter to efficiently collect visible light generated from a panel, thereby increasing the brightness of a display image. The present invention relates to a filter capable of improving the liquid crystal display and a liquid crystal display device having the same.

Recently, the display field for visually expressing various electrical signal information is rapidly developing, and in response to this, various flat panel displays (FPDs) with excellent characteristics such as thinness, light weight, and low power consumption are being developed. It is introduced and rapidly replaced the existing CRT (Cathode Ray Tube).

Examples of such flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), and electroluminescence displays (ELDs). The liquid crystal display has a large contrast ratio and is excellent in moving image display, and is currently used most widely in the field of display screens, monitors, and TVs for notebook computers.

However, in the conventional liquid crystal display, when a black image is implemented, external light is reflected from the front of the panel due to the white phosphor exposed on the lower panel of the display panel, so that the black image is a dark series of bright colors. There is a problem that the perceived dark contrast is reduced.

Accordingly, an object of the present invention is to provide a display filter and a liquid crystal display device having the same, in which a reflective layer made of a metal material is formed on at least one surface of a pattern portion in the filter, thereby reflecting visible light emitted from the panel to increase luminance. have.

The display filter and the liquid crystal display device having the same according to the present invention for achieving the above object, in the display filter formed on the front surface of the liquid crystal display panel, a base portion and a plurality of formed on the base portion to absorb external light The pattern portion of, and at least one surface of the pattern portion includes a reflective layer made of a metal material.

A filter according to the present invention and a liquid crystal display having the same. A reflective layer made of a metal material may be formed on the base portion of the filter formed on the front surface of the liquid crystal display panel and the at least one pattern portion absorbing external light to reflect the visible light emitted from the panel to increase the luminance. have.

Hereinafter, with reference to the drawings will be described the present invention in more detail.

1 is a cross-sectional view showing the structure of a display filter.

Referring to FIG. 1, the display filter is formed by including a reflective layer (not shown) on at least one surface of the base part 100, the pattern part 110, and the pattern part 110.

Base portion 100 is preferably made of a transparent plastic material, for example, a resin-based material formed by UV (UV) curing so that light can be transmitted through smoothly, and enhances the effect of protecting the front of the panel. For this purpose, a solid glass material may be used.

The pattern portion 110 is formed on the base portion 100 and absorbs external light. The pattern portion 110 may have a triangular shape, in addition, may have various shapes such as a trapezoid and a quadrangle. The pattern part 110 is formed of a material of darker color than the base part 100, and preferably, a material of black color.

For example, the pattern unit 110 may be formed of a carbon-based material or may apply a black dye to maximize the effect of absorbing external light. Hereinafter, the wider of the upper and lower ends of the pattern unit 110 is referred to as the lower end of the pattern unit 110.

The pattern unit 110 may include light absorbing particles, and the light absorbing particles may be resin particles colored in a specific color. In order to maximize the light absorption effect, the light absorbing particles are preferably colored black.

In order to facilitate the manufacture of the light absorbing particles and the addition into the pattern unit 110 and to maximize the effect of absorbing external light, the size of the light absorbing particles may be 1 μm to 10 μm.

Also, when the size of the light absorbing particles is 1 μm to 10 μm, the pattern unit 110 may include 10 wt% or more of the light absorbing particles in order to effectively absorb external light refracted by the pattern unit 110. That is, light absorbing particles having a weight of 10% or more of the total weight of the pattern unit 110 may be included in the pattern unit 210.

The reflective layer (not shown) is made of a metal material that reflects light incident on the pattern portion, and a detailed description of the reflective layer (not shown) will be described later with reference to FIG. 6.

2 to 5 are cross-sectional views illustrating various examples for describing optical characteristics according to the structure of a display filter.

In the case of FIG. 2, in order to absorb and block external light and totally reflect visible light emitted from the panel 210 to increase the reflectance of the panel light, the refractive index of the pattern portion 205 and the inclined surface that is at least part of the pattern portion 205. Is the case where the refractive index of is smaller than the refractive index of the base portion 200.

As described above, the external light that lowers the clear room contrast of the panel is often located above the panel 210.

Referring to FIG. 2, according to Snell's law, external light (indicated by a dotted line) incident at an angle to the filter is refracted and absorbed into the pattern portion 205 having a refractive index smaller than that of the base portion 200. External light refracted into the pattern portion 205 may be absorbed by the light absorbing particles. In addition, the light emitted from the panel 210 to the outside (indicated by the solid line) for display is totally reflected on the inclined surface of the pattern portion 205 and reflected to the outside, which is the observer's side.

As described above, the external light (indicated by the dotted line) is refracted and absorbed by the pattern portion 205 and the light emitted by the panel 210 (indicated by the solid line) is totally reflected in the pattern portion 205. As shown, the angle of external light with the inclined surface of the pattern portion 205 is greater than the angle between the light of the panel 210 and the inclined surface of the pattern portion 205.

Therefore, the display filter according to the present invention absorbs the external light so that the external light is not reflected to the observer side, and improves the clear contrast of the display image by increasing the reflection amount of the light emitted from the panel 210.

In order to maximize absorption of external light and total reflection of light of the panel 205 in consideration of the angle of external light incident on the panel 210, the refractive index of the pattern part 205 may be 0.3 times or more and less than 1 times the refractive index of the base part 200. desirable. In order to maximize the total reflection of the light emitted from the panel 210 on the inclined surface of the pattern portion 205, considering the vertical viewing angle of the panel, the refractive index of the pattern portion 205 is 0.3 times to the refractive index of the base portion 200. It is preferable that it is 0.999 times.

3 illustrates an example in which an upper end of the pattern part 225 is disposed on the observer's side and a refractive index of the pattern part 225 is greater than that of the base part 220. Referring to FIG. 3, since the refractive index of the pattern portion 225 is greater than the refractive index of the base portion 220, all the external light and the panel light incident on the pattern portion 225 according to Snell's law are absorbed by the pattern portion 225. do.

Therefore, when the upper end of the pattern portion 225 is disposed on the observer side and the refractive index of the pattern portion 225 is larger than the refractive index of the base portion 220, the ghost phenomenon can be reduced. In order to sufficiently absorb the panel light incident on the pattern portion 225 to prevent ghosting, the difference between the refractive index of the pattern portion 225 and the refractive index of the base portion 220 is preferably 0.05 or more.

When the refractive index of the pattern portion 225 is larger than the refractive index of the base portion 220, the refractive index of the pattern portion 225 and the base portion 220 may be used to prevent ghosting and not to significantly reduce the transmittance of the filter. The difference in refractive index is preferably 0.05 to 0.3.

In addition, in order to prevent the ghost phenomenon and to maintain the clear yarn coat of the panel at an appropriate level, the refractive index of the pattern portion 225 is preferably 1.001 times to 1.3 times the refractive index of the base portion 220.

4 illustrates a case where the lower end of the pattern part 245 is disposed on the observer's side and the refractive index of the pattern part 245 is smaller than that of the base part 240.

As illustrated in FIG. 4, the lower end of the pattern part 245 is disposed on the observer side to which external light is incident, so that the external light is absorbed at the lower end of the pattern part 245, thereby improving external light blocking effect of the display filter. In addition, since the interval between the lower ends of the pattern portion 245 can be made larger than that shown in FIG. 3, the aperture ratio of the display filter can be improved.

As shown in FIG. 4, the panel light emitted from the panel 250 may be reflected at the inclined surface of the pattern part 245, and may be gathered around the panel light passing through the base part 240. Thus, the ghost phenomenon can be reduced without significantly reducing the transmittance of the filter.

In order to prevent the ghost phenomenon as the panel light is reflected from the inclined surface of the pattern part 245 and passes through the base part 240 as the center, the distance d between the panel 250 and the filter is 1. It is preferable that they are mm-3mm.

5 illustrates a case where the lower end of the pattern part 265 is disposed on the observer's side and the refractive index of the pattern part 265 is larger than that of the base part 260.

As shown in FIG. 5, since the refractive index of the pattern portion 265 is greater than that of the base portion 260, the panel light incident on the inclined surface of the pattern portion 265 may be absorbed by the pattern portion 265. Accordingly, since the image is displayed by the panel light passing through the base unit 260, the ghost phenomenon can be reduced.

In addition, since the refractive index of the pattern portion 265 is larger than that of the base portion 260, the external light absorbing effect may be improved.

6 is a cross-sectional view showing the structure of a display filter according to an embodiment of the present invention.

Referring to FIG. 6, the display filter includes a base 300, a pattern 310, and a reflective layer 315 at the bottom of the pattern 310.

Since the optical characteristics and the base portion 300 and the pattern portion 310 of the display filter are similar to those described with reference to FIGS. 1 to 6, they will be omitted below.

Since the lower end of the pattern part 310 of the display filter is disposed on the panel side, the reflective layer 315 may be formed on the lower end of the pattern part 310, and the upper end of the pattern part 310 may be disposed on the observer side where external light is incident. have.

The lower end of the pattern unit 110 may be disposed on the panel side, and the upper end of the pattern unit 110 may be disposed on the observer side where external light is incident.

Since the external light source is generally located above the panel, the external light is incident on the panel at an angle from the upper side and absorbed by the pattern portion 310.

The reflective layer 310 may not absorb light incident from the panel into the pattern portion 310 of the display filter, and may reflect the incident light to efficiently collect the light, thereby improving the brightness of the display image.

The reflective layer 310 may be formed of a metal or plastic material having excellent workability. Preferably, a reflective layer 310 made of Ag, Ni, Cu, Cr, and Al may be formed.

7 to 9 are cross-sectional views illustrating various structures of a display filter according to another embodiment of the present invention.

Referring to FIG. 7, the display filter of the present invention is formed on the base part 320, the base part 320, and at least one pattern part 325 for absorbing external light and at least one surface of the pattern part 325. The film layer 335 is formed on at least one surface of the reflective layer 330 and the base portion 320 formed in the. The detailed configuration of the base portion 325 and the at least one pattern portion 325 is the same as described above, and will not be described below.

The film layer 335 may include at least one of poly ethylene terephthalate (PET) or poly methyl meta acrylate (PMMA). When PET is used as the film layer 335, light generated from a panel (not shown) can be easily emitted to the outside due to high transparency, and when PMMA is used as the film layer 335, the thickness of the filter is thick while heat resistance is achieved. This good heat generation can be used for many large display devices.

Referring to FIG. 8, the display filter of the present invention is formed on the base part 320, the base part 320, and at least one pattern part 325 that absorbs external light, and at least one surface of the pattern part 325. It includes a reflective layer 330 is formed on, at least one surface of the base portion 320, the film layer 335 and at least one glass particle 340 formed on at least one surface of the film layer 335.

A detailed configuration of the base portion 325, the at least one pattern portion 325, and the film layer 335 is the same as that of FIG. 7, and will not be described below.

The glass particles 340 may be formed on at least one surface of the film layer 335, and although not shown, may be formed close to the base 320 of the filter or may be formed on the entire film layer 335.

In order to prevent the transmittance of the panel light from decreasing, the glass particles 340 may be included in a predetermined weight part on the film layer 335, and the glass particles 340 distributed in the film layer 335 may be a film layer 335. It may have an irregular distribution without having a regular distribution within.

In addition, the glass particles 340 distributed in the film layer 335 may be completely included in the film layer 335 so as not to be exposed on the surface of the film layer 335.

The glass particles 340 may diffuse the panel light transmitted through the filter, thereby improving luminance.

Referring to FIG. 9, the filter 350 according to the present invention may further include an AR / NIR sheet 360 and an EMI shielding sheet 370, and may be disposed between the filter 350 and the sheets 360 and 370. The adhesive layer 380 may be formed.

The AR / NIR sheet 360 is an anti-reflection (AR) layer 361 that has a function of reducing glare by preventing reflection of light incident from the outside on the front surface of the base sheet 363 made of a transparent plastic material. NIR (Near Infrared) shielding sheet 362 may be attached to the rear, shielding the near-infrared radiation emitted from the panel so that the signals transmitted using infrared rays such as a remote control can be normally transmitted.

The EMI shielding sheet 370 shields electromagnetic interference (EMI) to prevent the EMI emitted from the panel from being emitted to the outside, and a plurality of conductive layers, for example, a plurality of reflective layers and conductive transparent layers It may have an alternately stacked structure.

An adhesive layer 380 may be formed between the AR / NIR sheet 360, the EMI shield sheet 370, and the filter 350, and may further include a base sheet included between the sheets 360 and 370. It is preferable to use substantially the same material as a material in consideration of ease of manufacture.

Meanwhile, in FIG. 9, the AR / NIR sheet 360, the EMI shield sheet 370, and the filter 350 are stacked in this order, but the stacking order may be differently stacked by those skilled in the art.

In addition, at least one of the illustrated sheets 360 and 370 may be omitted, or another functional layer may be added.

At least one of the basesheets shown in FIG. 9 may be omitted, and any one of the basesheets may be made of hard glass, which is not made of plastic, to improve a function of protecting the panel. . The glass is preferably formed spaced apart from the panel at a predetermined interval.

As described above, the filter according to the present invention may be formed as a film filter type attached to a panel using an adhesive, and alternatively, it may be formed as a glass filter type spaced apart from a panel including glass.

10 is a perspective view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 10, the liquid crystal display device 400 may display an image by using the electro-optical characteristics of the liquid crystal.

The liquid crystal display device 400 may include a filter 405, a backlight unit 410, and a liquid crystal panel 480.

The backlight unit 410 may be mounted under the liquid crystal panel 480, and may provide light to the liquid crystal panel 480.

The backlight unit 410 may include a light source 420 and a prism sheet 430. In addition, the backlight unit 410 may further include a light guide plate 440, a reflective plate 450, a bottom cover 460, and a mold frame 470.

The liquid crystal panel 480 may be seated on the mold frame 470 and may be fixed by the top cover 490 fastened to the bottom cover 460 in a top-down manner.

The liquid crystal panel 480 may display an image using light provided from the backlight unit 410, specifically, light emitted from the light source 420.

The liquid crystal panel 480 may include a color filter substrate 482 and a thin film transistor substrate 485 facing each other with the liquid crystal interposed therebetween.

The color filter substrate 482 may implement colors of the image displayed through the liquid crystal panel 480.

The color filter substrate 482 may include a color filter array formed of a thin film on a transparent substrate such as glass or plastic, for example, a red / green / blue color filter. Here, the upper polarizer may be disposed on the color filter plate 482.

The thin film transistor substrate 485 is electrically connected to the printed circuit board 418 on which a plurality of circuit components are mounted through the driving film 416. The thin film transistor substrate 485 may apply a driving voltage provided from the printed circuit board 418 to the liquid crystal in response to a driving signal provided from the printed circuit board 418.

The thin film transistor substrate 485 may include a thin film transistor and a pixel electrode formed of a thin film on another substrate of a transparent material such as glass or plastic.

In addition, referring to FIG. 10, it is preferable that the display filter 405 is formed on the front surface of the liquid crystal panel 480 of the liquid crystal display device 400 according to the present invention. Since the description of the display filter 405 is the same as the above-described FIGS. 7 to 9, a description thereof will be omitted.

FIG. 11 is a cross-sectional view illustrating light passing from a backlight unit of the liquid crystal display of FIG. 10 passing through a filter.

Referring to FIG. 10, the liquid crystal display device 400 according to the present invention may include a display filter 405, a backlight unit 410, and a liquid crystal panel 480. Since the description of the display filter 405, the backlight unit 410, and the liquid crystal panel 480 is the same as that described with reference to FIG. 8, it will be omitted below.

When the backlight unit 410 mounted below the liquid crystal panel 480 provides light to the liquid crystal panel 480, light is incident on the filter 405 on the liquid crystal panel 480.

When light is incident on the display filter 405 on the liquid crystal panel 480, the light incident on the base portion 402 is emitted to the outside of the liquid crystal display device 400.

On the other hand, when the light is incident on the pattern portion 407 is not absorbed by the pattern portion 407, the light is reflected by the reflective layer 406 formed at the bottom of the pattern portion 407 is included in the backlight unit 410 The light is emitted to the outside of the liquid crystal display device 400 through the reflective plate 450, thereby improving the transmittance of the light, thereby improving the luminance.

In addition, the display filter 405 is disposed on the front surface of the liquid crystal panel 480 to absorb external light incident on the liquid crystal panel 480 from the pattern unit 407 so that a person other than the external light blocking effect and the observation difference is displayed on the panel. It can have security effects that can not be seen.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a cross-sectional view showing the structure of a display filter;

2 to 5 are cross-sectional views showing various examples for explaining the optical characteristics according to the structure of the display filter,

6 is a cross-sectional view showing the structure of a display filter according to an embodiment of the present invention;

7 to 9 are cross-sectional views showing various structures of a display filter according to another embodiment of the present invention;

10 is a perspective view illustrating a liquid crystal display according to an embodiment of the present invention; and

FIG. 11 is a cross-sectional view illustrating light passing from a backlight unit of the liquid crystal display of FIG. 10 passing through a filter.

<Explanation of symbols on main parts of the drawings>

320: base portion 325: pattern portion

330: reflective layer 335: film layer

Claims (15)

In the display filter formed on the front of the liquid crystal display panel, A base portion; At least one pattern portion formed on the base portion to absorb external light; And And a reflective layer made of a metal material on at least one surface of the pattern portion. The method of claim 1, The display filter further comprises a film layer formed on at least one surface of the base portion. The method of claim 2, The base part is positioned between the panel and the film layer, wherein the reflective layer is formed on the lower end of the wider of the upper end and the lower end of the pattern portion. The method of claim 3, And a wide bottom of the pattern portion is disposed closer to the panel. The method of claim 1, The reflective layer comprises at least one of Al, Ag, Ni, Cu and Cr. The method of claim 1, And the pattern portion includes light absorbing particles. The method of claim 6, Display filter, characterized in that the size of the light absorbing particles are 1㎛ to 10㎛. The method of claim 1, And the refractive index of the pattern portion is smaller than the refractive index of the base portion, and the refractive index of the pattern portion is 0.3 times to 0.999 times the refractive index of the base portion. The method of claim 1, And the refractive index of the pattern portion is greater than the refractive index of the base portion, and the difference between the refractive index of the pattern portion and the refractive index of the base portion is 0.001 to 0.3. The method of claim 1, The base unit display filter, characterized in that it comprises at least one of UV-curable resin-based and glass materials. The method of claim 2, The film layer is a display filter comprising at least one of PET (Poly Ethylene Terephthalate) and PMMA (Poly Methyl Meta Acrylate). The method of claim 2, At least one glass particle is formed on at least one surface of the film layer. The method of claim 1, At least one of an anti-reflection (AR) layer for preventing reflection of external light, a near infrared shielding layer for shielding near infrared rays emitted from the panel, and an electromagnetic interference shielding layer for shielding electromagnetic waves Display filter characterized in that. The liquid crystal display device of any one of Claims 1-13 arrange | positioned at the front surface of a liquid crystal display panel. The method of claim 14, And a distance between the panel and the display filter is 1 mm to 3 mm.

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