KR20080058095A - External light shielding layer for display filter, display filter comprising the same and display device comprising the display filter - Google Patents

Abstract

An external light shielding layer for a display filter, a display filter comprising the same and a display device comprising the display filter are provided to increase brightness of an incident light by increasing aperture ratio as increasing contrast ration. A base film(263) is formed with a transparent resin. A light shielding pattern comprises a plurality of stripes(265) formed on one plane of the base film. The stripe comprises a plurality of light shielding pattern pieces(267) which are disconnected with each other. A straight line vertical to the stripe on the base film crosses with the light shielding pattern piece plural times. The base film is formed with a thermosetting resin, and the stripes are straight lines or curves.

Description

External light shielding layer for display filter, display filter comprising the same and display device comprising the display filter}

1 is an exploded perspective view showing a conventional PDP apparatus.

2A is a cross-sectional view of a conventional glass type display filter.

2B is a cross-sectional view of a conventional film type display filter.

3 is a perspective view showing a conventional external light shielding layer.

Figure 4 is a perspective view showing an embodiment of an external light shielding layer for a display filter according to the present invention.

5A is an enlarged plan view illustrating an example of a light shielding pattern piece according to the present invention.

5B is a comparative example for explaining the light shielding pattern of the present invention.

6A is a cross-sectional view taken along the line AA ′ of FIG. 5A.

FIG. 6B is a cross-sectional view taken along line BB ′ of FIG. 5B.

7 is a perspective view showing another embodiment of an external light shielding layer for a display filter according to the present invention.

8 is an enlarged plan view showing another embodiment of the light shielding pattern piece according to the present invention.

9 is an enlarged plan view showing still another embodiment of the light shielding pattern piece according to the present invention.

10A is a longitudinal sectional view showing an embodiment of a light shielding pattern piece according to the present invention.

10B is a longitudinal sectional view showing another embodiment of the light shielding pattern piece according to the present invention.

10C is a longitudinal sectional view showing still another embodiment of the light shielding pattern piece according to the present invention.

10D is a longitudinal sectional view showing still another embodiment of the light shielding pattern piece according to the present invention.

10E is a longitudinal sectional view showing still another embodiment of the light shielding pattern piece according to the present invention.

FIG. 11 is a partially enlarged view of the external light shielding layer surface of FIG. 4.

12A is a cross-sectional view of a glass type display filter according to an embodiment of the present invention.

12B is a cross-sectional view of a film type display filter according to an embodiment of the present invention.

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

100: plasma display panel (PDP) 110: case

120: drive circuit board 130: panel assembly

140: display filter 143: glass-type display filter

145: film type display filter 150: cover

210: antireflection film 220: glass substrate

230: electromagnetic shield 240: near infrared shield

250: color correction layer 260: external light shielding layer for the display filter

263: base material made of transparent resin 265: stripe

266: Light shielding pattern 267: Light shielding pattern

269: gap 270: support

310: incident light 320: external light

411: length of light shielding pattern piece 413: line width of light shielding pattern piece

415: longitudinal pitch of light shielding pattern piece 417: stripe pitch

The present invention relates to an external light shielding layer for a display filter, and more particularly, to an external light shielding layer for a display filter having a characteristic of increasing the contrast ratio and increasing the brightness of incident light while increasing the contrast ratio, and a display filter comprising the same. A display device is included.

Large display devices such as plasma display panel (PDP) devices, organic light emitting diode (OLED) devices, liquid crystal display (LCD) devices, or field emission display (FED) devices, personal digital assistants (PDAs), small game console displays, Small mobile display devices such as mobile phone display windows, and various display devices for displaying images such as flexible display devices are indispensable in the modern society, and thus, development of large-sized displays and thinning technologies of these displays are in progress.

In general, PDP (Plasma Display Panel) devices are being developed as a display device to replace CRTs because they can satisfy both size and thickness at the same time as CRTs representing conventional display devices.

As shown in FIG. 1, the conventional PDP 100 includes a case 110, a cover 150 covering an upper portion of the case, a driving circuit board 120 accommodated in the case, and a discharge cell in which gas discharge occurs. It consists of a panel assembly (panel assembly) 130 and the display filter 140.

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

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

Therefore, electromagnetic waves and near-infrared rays generated from 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, 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, the display filter 140 is employed.

The display filter 140 shields electromagnetic waves and prevents reflection of external light, and is classified into a glass type display filter 143 and a film type display filter 145. As shown in FIG. 2A, the glass type display filter 143 includes an antireflection coating 210, a glass substrate 220, an EMI shielding film 230, and a near infrared ray shielding film (NIR). 240, a color correction film 250, and the like. In this case, an adhesive layer is actually formed between the films of the display filter to bond the films. In addition, the color correction layer 250 is generally formed by inserting a specific material into the adhesive layer. The structure of the display filter varies slightly depending on the manufacturer, and the structure of the display filter is generally used here.

The anti-reflection film 210 prevents light incident from the outside from being reflected back to the outside to improve the contrast of the PDP. The anti-reflection film 210 is formed on the surface of the display filter. Meanwhile, the anti-reflection film 210 may be further formed on the rear surface of the display filter. The color correction layer 250 improves the optical characteristics of the PDP by decreasing the luminance of red and green of the light incident from the panel and increasing the luminance of blue.

The glass substrate 220 prevents the display filter 140 from being damaged from an external impact. In other words, the glass substrate 220 supports the display filter 140 to prevent the display filter 140 from being damaged from an external impact. The electromagnetic shielding layer 230 shields electromagnetic waves to prevent electromagnetic waves incident from the panel from being emitted to the outside. The near infrared rays (NIR) shielding layer 240 shields the near infrared rays and prevents the near infrared rays incident from the panel from being emitted to the outside. Here, the near infrared rays belong to the wavelength range of 700 to 1200 nm, and are generated by Xe emitting 800 to 1000 nm rays during discharge of the mixed gas filled in the panel of the PDP. When such near infrared rays are emitted to the outside, signals from devices such as remote controllers that transmit signals using infrared rays cannot be normally transmitted to the PDP. That is, the emission of near infrared rays causes a malfunction of the remote controller. As a result, the near-infrared shielding film uses a near-infrared absorbing dye to prevent signals from being transmitted from the remote controller to the panel. Meanwhile, the electromagnetic shielding film 230 and the near infrared shielding film 240 may be formed of one layer.

The glass substrate 220 is used in the conventional glass-type display filter 143 to prevent damage caused by the impact from the outside. However, when the glass substrate 220 is inserted into the display filter 140, the thickness of the display filter becomes thick, and the weight becomes heavy.

In order to solve such a problem, the film type display filter 145 having the glass substrate 220 removed as shown in FIG. 2B has been developed. The structure of the film type display filter 145 may vary depending on the manufacturer, but generally, an antireflection coating 210, an EMI shield 230, and a near infrared ray (NIR) shield 240, a color correction film 250, and the like.

Such a film type display filter 145 has an advantage that the weight is lighter and thinner than the glass type display filter 143. In addition, the film-type display filter 145 may reduce the manufacturing cost compared to the glass-type display filter 143.

An important problem in the display device, such as the PDP is that the external ambient light can be introduced into the panel assembly through the display filter in bright conditions, that is, bright room conditions. In this case, as shown in FIG. 2B, the incident light 310 generated in the discharge cell in the panel assembly and the external environment light introduced through the display filter from the outside occur. As a result, the contrast ratio is lowered under the brightest conditions, resulting in poor display capability of the PDP.

The external environmental light may be introduced at various angles with respect to the front surface of the PDP, but the external environmental light, which mainly affects the PDP, is mainly located above the PDP due to the sun, artificial lighting, etc., and thus mainly affects the PDP. As shown in FIG. 2B, the external ambient light introduced at an angle of 45 ° or less with respect to the plane of the display filter is called the external light 320, and is the main object when shielding the external ambient light.

In order to shield external environmental light flowing at various angles with respect to the front surface of the PDP, the Republic of Korea Patent Publication No. 10-2006-0080116, as shown in Figure 3, the light shielding pattern 266 consisting of a plurality of stripes 265 is a transparent resin Disclosed is an external light shielding layer 260 for a display filter in which an external light shielding layer formed on a substrate 263 is attached to a support 270. The technique can increase the contrast ratio of the PDP by absorbing external environmental light by the light shielding pattern, but the light shielding pattern has a surface aperture ratio of the external light shielding layer which is a space through which incident light generated in a discharge cell in the panel assembly can pass. Since the ratio of the surface area of the external light shielding layer plane excluding the pattern surface of the light shielding pattern to the total surface area of the external light shielding layer plane is also reduced simultaneously, there is a problem of reducing the luminance of incident light.

Accordingly, the first technical problem to be achieved by the present invention is to provide an external light shielding layer for a display filter having the characteristic of increasing the brightness ratio of incident light by increasing the aperture ratio while increasing the contrast ratio.

The second technical problem to be achieved by the present invention is to provide a display filter having a characteristic of increasing the brightness of incident light while increasing the contrast ratio.

A third object of the present invention is to provide a display apparatus including a display filter having a characteristic of increasing brightness of incident light while increasing contrast ratio.

The present invention to achieve the first technical problem,

Base material made of transparent resin; And

It includes a light shielding pattern consisting of a plurality of stripes formed on one surface of the substrate,

The stripe is formed of a plurality of light blocking pattern pieces that are disconnected from each other, and a straight line perpendicular to the stripe on the substrate surface intersects the light blocking pattern piece a plurality of times, thereby providing an external light shielding layer for a display filter.

According to an embodiment of the present invention, the substrate may be made of a photocurable resin.

According to another embodiment of the present invention, the stripe may be straight or curved.

According to another embodiment of the present invention, the cut surface of the light shielding pattern piece may be a flat, curved or irregular surface.

According to another embodiment of the present invention, the longitudinal cross-sectional shape of the light shielding pattern piece may be triangular, square, trapezoidal, circular or elliptical.

According to another embodiment of the present invention, the light shielding pattern may be composed of a black inorganic material, an organic material or a metal.

According to another embodiment of the present invention, the pitch of the stripe may be 50 ~ 100μm.

According to another embodiment of the present invention, the length of the light shielding pattern piece may be 50 ~ 1000μm.

According to another embodiment of the present invention, the longitudinal pitch of the light shielding pattern piece may be 100 to 1100 μm.

According to another embodiment of the present invention, the line width of the light shielding pattern piece may be 10 ~ 40μm.

According to another embodiment of the present invention, the light blocking pattern piece may have a depth of 30 μm to 150 μm.

The present invention provides a display filter including the external light shielding layer for the display filter in order to achieve the second technical problem.

The present invention provides a display device including the display filter in order to achieve the third technical problem.

The external environmental light may be introduced at various angles with respect to the front surface of the PDP. However, the external environmental light that mainly affects the PDP is generated from the sun, artificial lighting, etc. located at the top of the PDP. In the present invention, as shown in FIG. 2B, in particular, external environment light introduced at an angle of 45 ° or less with respect to the plane of the display filter is defined as external light 320, and is a main object of external environment light shielding according to the present invention. .

In addition, the display device used in the present invention is a large display device such as a plasma display panel (PDP) device, an organic light emitting diode (OLED) device, a liquid crystal display (LCD) device or a field emission display (FED) device, and a PDA. (Personal Digital Assistants), a small game console display window, a mobile phone display window, such as a small mobile (mobile) display device, a flexible (flexible) display device can be variously applied. 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, a PDP device is described as an example for convenience of description, but the present invention is not limited thereto.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings and examples, but the present invention is not limited thereto.

The external light shielding layer 260 for a display filter according to the present invention includes a substrate 263 made of a transparent resin as shown in FIG. 4; And a light shielding pattern 266 including a plurality of stripes 265 formed on one surface of the substrate, and the stripe 265 includes a plurality of light shielding pattern pieces 267 which are disconnected from each other. The stripe 265 absorbs external light to prevent external light from entering the panel assembly and totally reflects incident light from the panel assembly toward the viewer. Thus, a high transmittance to visible light and a high contrast ratio can be obtained. The light shielding pattern according to the present invention is characterized by consisting of a plurality of light shielding pattern pieces which are mutually disconnected unlike the prior art. The light shielding pattern 266 is formed of the light shielding pattern piece 267, thereby preventing the display filter external light shielding layer except for the pattern surface of the light shielding pattern 266 with respect to the entire surface area of the display filter external light shielding layer 260. 260) the opening ratio, which is the ratio of the surface area of the plane, is increased as compared with the prior art. Since the incident light is generally incident perpendicular to the plane of the external light shielding layer 260 for the display filter, the incident light can be transmitted through the gap 269 between the adjacent light shielding pattern pieces 267, and the light shielding pattern pieces 267 are included. The increase in the aperture ratio corresponds to the area of the gap 269 therebetween, which leads to an increase in the amount of incident light transmitted, thereby enabling an increase in the brightness of the incident light.

Further, the present invention is characterized in that a straight line AA 'perpendicular to the stripe 265 intersects the light shielding pattern piece 267 four times on the substrate surface as shown in FIG. 5A. do. Meaning that the vertical straight line intersects the light shielding pattern piece 267 more than once a plurality of times means that the gap between adjacent light shielding pattern pieces 267 has an interval enough to shield external light. That is, the light shielding pattern according to the present invention can prevent the external light 320 from passing through the gap 269 between adjacent light shielding pattern pieces 267, as shown in FIG. 6A showing the cross-section of AA ′ of FIG. 5A. have.

However, the interval of the gap 269 is wide enough that a straight line perpendicular to the stripe 265 does not intersect the light shielding pattern piece 267 a plurality of times as in the present invention, but crosses 0 or 1 time. When it loses, external light is transmitted as usual. That is, as shown in FIG. 5B, when the gap 269 is widened, a straight line BB ′ perpendicular to the stripe 265 is once on the light shielding pattern piece 267 on the substrate surface of FIG. 5B. In some cases, a straight line CC ′ perpendicular to the stripe 265 crosses the light shielding pattern piece 267 on the substrate surface zero times. The present invention is characterized by having a gap 269 as described above, except that the gap is widened to the extent shown in FIG. 5B.

That is, when the straight line BB 'perpendicular to the stripe 265 crosses the light shielding pattern piece 267 once on the substrate surface of FIG. 5B, as shown in FIG. The external light 320 is not absorbed and blocked by the light shielding pattern piece 267, and is transmitted through the gap 269 between adjacent light shielding pattern pieces 267. In addition, when the straight line CC ′ perpendicular to the stripe 265 crosses the light shielding pattern piece 267 on the substrate surface 0 times, external light is not absorbed at all by the light shielding pattern piece 267 and is not blocked. The light is transmitted as it is through the gap 269 between the light shielding pattern pieces 267. That is, according to the present invention, as shown in FIG. 5A, a straight line perpendicular to the stripe 265 on the substrate surface has a gap 269 that can cross the light shielding pattern piece 267 two or more times. As shown in FIG. 6A, a considerable amount of external light 320 is difficult to transmit through the gap 269 between adjacent light shielding pattern pieces 267. In addition, since the incident light 310 generated in the discharge cell in the panel assembly is generally incident perpendicular to the plane of the external light shielding layer, the incident light 310 is easily transmitted through the gap 269 between the adjacent light shielding pattern pieces 267. . That is, in the case of using the conventional uninterrupted light shielding pattern, there is a problem in that the aperture ratio, which is the ratio of the space for the incident light 310 to transmit, is reduced, but according to the present invention, the external light 320 is the same as the conventional art. At the same time, the opening ratio is increased compared to the external light shielding layer according to the prior art, and thus, the luminance of the incident light can be increased.

As shown in FIG. 4, the light blocking pattern of the present invention may be buried in one surface of the substrate, or may be in various forms such as a form attached to the substrate. In addition, the light shielding pattern parallel to the longitudinal direction of the external light shielding layer shown in FIG. 4 may be inclined, in addition to the shape of the lattice.

The light shielding pattern may be formed by a roll molding method, a heat press method using a thermoplastic resin, or an injection molding method in which a thermoplastic or thermosetting resin is filled into a substrate on which a shape opposite to the light shielding pattern is transferred.

In addition, the substrate according to the present invention may be made of a photocurable resin, and by using the substrate as a photocurable resin, a black inorganic material, an organic substance or a metal which can absorb light in a pattern portion of the photocurable resin having a desired pattern formed thereon. It is possible to implement the present invention by a simple process of injecting the light-shielding pattern. In addition, when the photocurable resin constituting the substrate has an antireflection function, an electromagnetic shielding function, a color control function, or a combination thereof, the external light shielding layer 260 for the display filter may additionally perform these functions. have.

The stripe 265 of the present invention may be not only a straight form shown in FIG. 4 but also a curved form shown in FIG. 7, and a plurality of stripes 265 of the present invention may be repeated such as a lattice pattern formed by being formed vertically and horizontally. Any form can be used.

In addition, the cut surface of the light shielding pattern piece 267 may be a curved surface shown in FIG. 8 or an irregular surface shown in FIG. 9 in addition to the plane shown in FIG. 4, but is not limited thereto.

In addition, the longitudinal cross-sectional shape of the light shielding pattern piece 267 may be formed in various shapes such as a rectangle, a triangle, a trapezoid, a circle, and an oval, as shown in FIGS. 10A to 10E.

The light shielding pattern 265 of the present invention may be formed of a black inorganic material, an organic material, or a metal that can absorb light. Particularly, in the case of metal, since the electrical conductivity is high, that is, the electrical resistance is low, when the light shielding pattern 265 is formed by adding the metal thin film, the light shielding pattern 265 may be controlled because the electrical resistance may be adjusted according to the concentration of the metal powder. Electromagnetic shielding function can be performed. In addition, when using a black metal surface or black surface can perform the external light shielding and electromagnetic shielding function. As the light shielding pattern 265, a photocurable resin containing carbon may be used.

The stripe pitch 417 according to the present invention shown in Figure 11 may be 50 ~ 100μm, when less than 50μm there is a fear that the aperture ratio is reduced by narrowing the spacing between the stripes, when the distance between the stripe is wider than 100μm wider external light The shielding effect may be reduced. The stripe pitch 417 is a distance between mutually corresponding positions between adjacent stripes, for example, a distance between corresponding surfaces as shown in FIG. 11 or a distance between a center portion of the stripe 265 when the stripe width is constant. it means. The length 411 of the light shielding pattern piece may be 50 to 1000 μm. When the length of the light shielding pattern piece is less than 50 μm, the length of the light blocking pattern piece may be shortened to reduce external light shielding effect. As shown in FIG. 11, the length 411 of the said light shielding pattern piece means the distance from the tip part of one cutting surface to the other cutting surface in the longitudinal direction of the light shielding pattern piece in one light shielding pattern piece 267. As shown in FIG. The lengthwise pitch 415 of the light shielding pattern piece may be 100 to 1100 μm. When the length of the light shielding pattern piece is less than 100 μm, the length of the light shielding pattern piece may be shortened, and the external light shielding effect may be reduced. There is a fear that the luminance decreases. The longitudinal pitch 415 of the light shielding pattern piece has a distance between corresponding positions between adjacent light shielding pattern pieces, for example, a distance between corresponding positions between adjacent light shielding pattern pieces or a length of the light shielding pattern piece is constant. In this case, it means the distance between the central portions of the light shielding pattern piece. The line width 413 of the light shielding pattern piece may be 10 to 40 μm. When the light shielding pattern piece is less than 10 μm, the external light shielding effect may be reduced, and when it exceeds 40 μm, the aperture ratio may be decreased. The light shielding pattern piece may have a depth (not shown) of 30 to 150 μm. When the light shielding pattern piece is less than 30 μm, the external light shielding effect may be reduced. When the light shielding pattern piece is over 150 μm, the thickness of the external light shielding layer for the display filter may be increased to reduce the surface hardness. There is concern.

12A or 12B show examples of the display filters 143 and 145 according to the present invention. For convenience of description, members having the same functions as the members of FIGS. 2 to 3 are denoted by the same reference numerals, and description thereof is omitted. do. As shown in FIG. 12A or 12B, the external light shielding layer 260 for a display filter according to the present invention may be attached to a conventional glass type display filter 143 or a film type display filter 145. The external light shielding layer 260 for the display filter may be directly formed on the display filter 143, but may be coupled to the display filter 143 using the support 270 as illustrated in FIG. 12A. In addition, the position of the external light shielding layer 260 for the display filter is not limited to the example illustrated in FIG. 12A or 12B, and the position may be changed as necessary, and the number of the external light shielding layers 260 for the display filter is also 2. The above can be used.

In addition, by applying the display filter according to the present invention to a conventional display device, while having the effect of increasing the contrast due to the external light shielding of the display device in the same manner as in the prior art, the aperture ratio is increased and the brightness is increased.

<Example 1>

Using a mold and a photocuring machine on a transparent resin substrate (300 μm thick) made of an acrylic photocurable resin (manufactured by SSCP, IRF UV1), the stripe pitch was 74 μm, the length of each pattern piece was 75 μm, the line width was 25 μm, the depth was 75 μm, and the longitudinal pitch was 100 μm. After the pattern was formed, a black paint (manufactured by Samwha, Enamel Black Paint Matte) was injected to form a black layer on the pattern, and then the same photocurable resin as the acrylic photocurable resin (thickness 300 μm) was formed. Was applied to a total thickness of 400 μm and photocured to prepare an external light shielding layer having a light shielding pattern of the form shown in FIG. 4.

<Example 2>

The same outer light shielding layer as in Example 1 was produced except that the length of each pattern piece was replaced with 150 μm and the longitudinal pitch was 175 μm.

<Example 3>

The same external light shielding layer as in Example 1 was produced except that the length of each pattern piece was replaced with 300 μm and the longitudinal pitch was 325 μm.

<Example 4>

The same outer light shielding layer as in Example 1 was produced except that the length of each pattern piece was replaced with 300 μm, line width 15 μm, and longitudinal pitch 325 μm.

<Example 5>

The same external light shielding layer as in Example 1 was prepared except that the length of each pattern piece was replaced with 300 μm, line width 35 μm, and longitudinal pitch 325 μm.

<Example 6>

The same outer light shielding layer as in Example 1 was produced except that the length of each pattern piece was replaced with 300 μm, line width 50 μm, depth 50 μm, and longitudinal pitch 325 μm.

<Example 7>

The same outer light shielding layer as in Example 1 was prepared except that the length of each pattern piece was replaced with 300 μm, line width 50 μm, depth 100 μm, and longitudinal pitch 325 μm.

Comparative Example 1

Using a mold and a photocuring machine on a transparent resin substrate (300 μm thick) made of acrylic photocurable resin (SSRF, IRF UV1), a pattern having a square pattern of 75 μm in pitch, 25 μm in line width and 75 μm in depth was formed. After forming, after injecting black paint (manufactured by Samwha, Enamel Black Paint Matte Type) to form a black layer on the pattern, the same photocurable resin (thickness 400m) as the photocurable resin was applied and then 4 to prepare an external light shielding layer having the same light shielding pattern in a continuous form without cutting.

<Test Example 1>

Contrast  exam

Examples of the external light shielding layers of Examples 1 to 7 and Comparative Example 1 are shown in FIG. 12B. A film type display filter (antireflection film), an electromagnetic shielding film (copper mesh), a near infrared shielding film (adding near infrared shielding dye to the resin), and color Attach the impact resistant film (ethylene-vinyl acetate-based adhesive film) on the opposite side of the external light to the correction film (adding color correction dye to the resin) to adjust the contrast ratio under the condition of 1% contrast in the bright room (CS-1000). Measured. In addition, a blank test was performed by measuring the contrast ratio in the same manner for the case where the external light shielding layer was not installed. The results are shown in Table 1.

<Test Example 2>

Measurement of luminance

The external light shielding layers of Test Examples 1 to 7 and Comparative Example 1 are shown in FIG. 12B in the form of a film-type display filter (antireflection film), an electromagnetic shielding film (copper mesh), a near infrared shielding film (adding near infrared shielding dye to the resin), and color. A correction film (adding color correction dyes to the resin) was attached to the opposite side of external light, and then mounted on the front surface of the panel assembly of the PDP, and the peak luminance was measured in a bright room (CS-1000). In addition, a blank test was performed by measuring luminance in the same manner for the case where the external light shielding layer was not installed. The results are shown in Table 1.

 Contrast Ratio Luminance (cd / m ² )  Blank experiment  316: 1  675  Example 1  430: 1  492  Comparative Example 1  652: 1  341  Example 2  507: 1  429  Example 3  558: 1  384  Example 4  452: 1  453  Example 5  681: 1  337  Example 6  503: 1  312  Example 7  621: 1  248

As can be seen from the results of Table 1, the contrast ratio of the external light shielding layer according to the present invention was increased in all examples compared to the experimental experiments, and also the contrast of Example 1 and Comparative Example 1 having similar pitch, line width, and depth of the stripe. It can be seen that the contrast ratio has a similar value. That is, according to the present invention, the contrast ratio has a value similar to that of the conventional continuous light shielding pattern, and it can be seen that the opening corresponding to the gap between each light shielding pattern piece is increased. As the opening increases, the luminance increases as shown in Table 1 below.

As described above, the external light shielding layer for a display filter according to the present invention has an effect of increasing the brightness ratio of the incident light by increasing the aperture ratio while increasing the contrast ratio, and the display filter and the display device using the same have the same effect.

Claims (13)

Base material made of transparent resin; And It includes a light shielding pattern consisting of a plurality of stripes formed on one surface of the substrate, And the stripe is formed of a plurality of light blocking pattern pieces that are disconnected from each other, and a straight line perpendicular to the stripe intersects the light blocking pattern piece a plurality of times on the substrate surface. The external light shielding layer for a display filter according to claim 1, wherein the substrate is made of a photocurable resin. The external light shielding layer of claim 1, wherein the stripe is straight or curved. The exterior light shielding layer of claim 1, wherein the cutout surface of the light shielding pattern piece is a flat surface, a curved surface, or an irregular surface. The external light shielding layer for a display filter according to claim 1, wherein the longitudinal cross-sectional shape of the light shielding pattern piece is triangular, square, trapezoidal, circular or elliptical. The external light shielding layer of claim 1, wherein the light shielding pattern is made of a black inorganic material, an organic material, or a metal. The external light shielding layer of claim 1, wherein the stripe has a pitch of 50 μm to 100 μm. The external light shielding layer for a display filter according to claim 1, wherein the light shielding pattern piece has a length of 50 to 1000 m. The external light shielding layer for a display filter according to claim 8, wherein the lengthwise pitch of the light shielding pattern piece is 100 to 1100 µm. The external light shielding layer for a display filter according to claim 1, wherein the line width of the light shielding pattern piece is 10 to 40 µm. The external light shielding layer for a display filter according to claim 1, wherein a depth of the light shielding pattern piece is 30 to 150 µm. A display filter comprising the external light shielding layer for any one of claims 1 to 11. A display device comprising the display filter of claim 12.

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