KR102617176B1 - Cover window and Display device including the same - Google Patents

Abstract

The present invention provides a cover window with a light-shielding pattern formed therein and without steps, and a display device including the same.
Since the cover window of the present invention has no steps, adhesion to the display device is improved.

Description

Cover window and display device including the same}

The present invention relates to a display device, and more particularly to a cover window without steps caused by a light blocking pattern and a display device including the same.

In keeping with the information age, the display field has also developed rapidly, and in response to this, a liquid crystal display device (FPD) has been developed as a flat panel display device (FPD) with the advantages of thinner, lighter, and lower power consumption. Light emitting diode display devices have been developed and are widely applied.

Among these flat panel displays, a liquid crystal display device (LCD) displays images by optical anisotropy and polarization of liquid crystals.

This liquid crystal display device consists of a liquid crystal panel formed by forming a liquid crystal layer between two opposing substrates and bonding them together as an essential component, and a backlight unit is located at the bottom of the liquid crystal panel. The electric field within the liquid crystal panel changes the arrangement direction of the liquid crystal molecules, creating images through differences in transmittance for light from the backlight unit.

Meanwhile, a light-emitting diode display device uses a light-emitting diode panel containing light-emitting diodes as an essential component, and displays images by emitting light when holes and electrons from the anode and cathode combine in the light-emitting layer.

In such a display device, a cover window is attached to the display surface to protect the display panel (liquid crystal panel or light emitting diode panel).

1 is a schematic diagram of a conventional display device.

As shown in FIG. 1, the display device 1 includes a display panel 10, a frame 20 covering the back and side surfaces of the display panel 10, and a front surface of the display panel 10. ), that is, it includes a cover window 30 located on the display surface side, and an adhesive layer 40 that attaches the cover window 30 and the display panel 10.

A light shielding pattern 32 is located on the cover window 30 to prevent light leakage from the edge of the display device 1.

The cover window 30 must be firmly attached to the display panel 10 through the adhesive layer 40. However, in the conventional display device 1, there is a problem in that the adhesion between the cover window 30 and the adhesive layer 40 is reduced and the adhesion between the light-shielding pattern 32 and the adhesive layer 40 is further reduced under high temperature/high humidity conditions. Occurs.

The present invention seeks to solve the problem of reduced adhesion due to a light-shielding pattern formed on a cover window.

To this end, the present invention provides a cover window that includes a base, a light-shielding pattern located on an inner edge of the base, and has flat upper and lower surfaces.

The cover window may include a horizontal portion and a vertical portion connected to each other, the horizontal portion may have a thickness smaller than the base, and the vertical portion may have the same thickness as the base.

Additionally, the horizontal portion may form a portion of the upper surface of the base, the vertical portion may form a portion of the lower surface of the base and a side surface, and the width of the vertical portion may be greater than the thickness of the horizontal portion.

Additionally, the present invention provides a display device including a cover window having the above-described features.

In the present invention, a light-shielding pattern is formed inside the cover window by selective irradiation of light (UV) to the cover window.

That is, unlike the conventional cover window in which steps are created by the light-shielding pattern, the cover window including the light-shielding pattern in the present invention has a flat upper and lower surface. Accordingly, the problem of deterioration of adhesion to the display panel due to the step caused by the light-shielding pattern is prevented.

In addition, in the present invention, a light-shielding pattern consisting of a horizontal part and a vertical part is formed by a UV irradiation process on each of the front and side surfaces of the cover window, thereby eliminating the light leakage problem of the display device without damaging the cover window and adhesive layer due to excessive UV irradiation. can be prevented.

1 is a schematic diagram of a conventional display device.
2A and 2B are schematic plan and cross-sectional views of a display device according to a first embodiment of the present invention.
Figure 3 is a schematic cross-sectional view of the liquid crystal panel.
Figure 4 is a schematic cross-sectional view of a light emitting diode panel.
5A and 5B are schematic cross-sectional views illustrating a manufacturing process of a cover window for a display device according to a first embodiment of the present invention.
Figure 6 is a diagram for explaining the light leakage problem occurring in the display device according to the first embodiment of the present invention.
Figure 7 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention.
8A to 8C are schematic cross-sectional views illustrating a manufacturing process of a cover window for a display device according to a second embodiment of the present invention.

Referring again to FIG. 1, a light blocking pattern 32 is formed on the cover window 30 of a conventional display device 1 to prevent light leakage, and the light blocking pattern 32 creates a step in the cover window 30. do.

That is, the light blocking pattern 32 is formed on the lower surface of the cover window 30 to create a step, thereby reducing the adhesive force between the cover window 30 and the adhesive layer 40. Additionally, under high temperature/high humidity conditions, bubbles are generated between the light blocking pattern 32 and the adhesive layer 40, further reducing the adhesive strength between the cover window 30 and the adhesive layer 40.

The present invention provides a cover window that includes a base, a light-shielding pattern located on an inner edge of the base, and has flat upper and lower surfaces.

In the cover window of the present invention, the light blocking pattern has a horizontal portion and a vertical portion connected to the horizontal portion.

In the cover window of the present invention, the horizontal portion has a thickness smaller than the base, and the vertical portion has the same thickness as the base.

In the cover window of the present invention, a photochromic material is included between one surface of the base and the horizontal portion.

In the cover window of the present invention, the horizontal portion forms a portion of the upper surface of the base, and the vertical portion forms a portion and a side surface of the lower surface of the base.

In the cover window of the present invention, the width of the vertical portion is greater than the thickness of the horizontal portion.

In the cover window of the present invention, along the surface direction of the base, the horizontal portion has a greater length than the vertical portion.

From another perspective, the present invention provides a display device including a display panel, the above-described cover window located on one surface of the display panel, and an adhesive layer located between the display panel and the cover window.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings.

2A and 2B are schematic plan and cross-sectional views of a display device according to a first embodiment of the present invention.

As shown in FIGS. 2A and 2B, the display device 100 according to the first embodiment of the present invention includes a display panel 101 and a front surface of the display panel 101, that is, on the display surface side. It includes a cover window 170 that is located and has a light-shielding pattern 172 therein, and an adhesive layer 180 that attaches the cover window 170 and the display panel 101.

Additionally, the display device 100 may further include a frame 190 that covers the back and side surfaces of the display panel 101.

In contrast, the frame 190 may cover only the side surface of the display panel 101. Additionally, the cover window 170 may be attached to the display panel 101 without the frame 190.

For example, the display panel 101 may be a liquid crystal panel or a light emitting diode panel.

Referring to FIG. 3, which is a schematic cross-sectional view of the liquid crystal panel, the display panel 101 has first and second substrates 210 and 250 facing each other, and between the first and second substrates 210 and 250. It is interposed and includes a liquid crystal layer 260 containing liquid crystal molecules 262.

Each of the first and second substrates 210 and 250 may be a glass substrate or a flexible plastic substrate.

A first buffer layer 220 is formed on the first substrate 210, and a thin film transistor (Tr) is formed on the first buffer layer 220. The first buffer layer 220 may be omitted.

A gate electrode 222 is formed on the first buffer layer 220, and a gate insulating film 224 is formed covering the gate electrode 222. Additionally, a gate wire (not shown) connected to the gate electrode 222 is formed on the buffer layer 220.

A semiconductor layer 226 is formed on the gate insulating film 224 to correspond to the gate electrode 222. The semiconductor layer 226 may be made of an oxide semiconductor material. Meanwhile, the semiconductor layer 226 may include an active layer made of amorphous silicon and an ohmic contact layer made of impurity amorphous silicon.

A source electrode 230 and a drain electrode 232 are formed on the semiconductor layer 226 and are spaced apart from each other. Additionally, a data wire (not shown) connected to the source electrode 230 is formed to intersect the gate wire to define a pixel area.

The gate electrode 222, the semiconductor layer 226, the source electrode 230, and the drain electrode 232 constitute a thin film transistor (Tr).

A protective layer 234 having a drain contact hole 236 exposing the drain electrode 232 is formed on the thin film transistor Tr.

On the protective layer 234, a pixel electrode 240 is connected to the drain electrode 232 through the drain contact hole 236, and a common electrode 242 is alternately arranged with the pixel electrode 240. is formed

A second buffer layer 252 is formed on the second substrate 250, and a black matrix 254 that covers non-display areas such as the thin film transistor (Tr), the gate wire, and the data wire is formed on the second buffer layer 252. ) is formed. Additionally, a color filter layer 256 is formed corresponding to the pixel area. The second buffer layer 252 and the black matrix 254 may be omitted.

The first and second substrates 210 and 250 are bonded with a liquid crystal layer 260 therebetween, and the liquid crystal layer 260 is formed by an electric field generated between the pixel electrode 240 and the common electrode 242. ) liquid crystal molecules are driven. Meanwhile, the common electrode 242 may be formed on the second substrate 250.

Although not shown, an alignment film may be formed on the top of each of the first and second substrates 210 and 250 in contact with the liquid crystal layer 260, and on the outside of each of the first and second substrates 210 and 250. A polarizing plate having transmission axes perpendicular to each other may be attached.

Additionally, a backlight unit is disposed below the first substrate 210 to supply light to the display panel 101.

For example, the backlight unit includes a light guide plate located below the display panel 101, a light source located on at least one side of the light guide plate, a reflector located on the back of the light guide plate, and the light guide plate and the display panel 101. ) may include an optical sheet located between them.

Meanwhile, referring to FIG. 4, which is a schematic cross-sectional view of the light emitting diode panel, the display panel 101 includes a substrate 310, a thin film transistor (Tr) located on the substrate 310, and an upper portion of the substrate 310. It is located in and includes a light emitting diode (D) connected to the thin film transistor (Tr).

The substrate 310 may be a glass substrate or a flexible plastic substrate.

A buffer layer 320 is formed on the substrate 310, and a thin film transistor (Tr) is formed on the buffer layer 320. The buffer layer 320 may be omitted.

A semiconductor layer 322 is formed on the buffer layer 320. The semiconductor layer 322 may be made of an oxide semiconductor material or polycrystalline silicon.

When the semiconductor layer 322 is made of an oxide semiconductor material, a light blocking pattern (not shown) may be formed under the semiconductor layer 322, and the light blocking pattern prevents light from entering the semiconductor layer 322. This prevents the semiconductor layer 322 from being deteriorated by light. Alternatively, the semiconductor layer 322 may be made of polycrystalline silicon, and in this case, both edges of the semiconductor layer 322 may be doped with impurities.

A gate insulating film 324 made of an insulating material is formed on the semiconductor layer 322. The gate insulating film 324 may be made of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode 330 made of a conductive material such as metal is formed on the gate insulating film 324 corresponding to the center of the semiconductor layer 322.

In FIG. 4 , the gate insulating film 324 is formed on the entire surface of the substrate 310, but the gate insulating film 324 may be patterned to have the same shape as the gate electrode 330.

An interlayer insulating film 332 made of an insulating material is formed on the gate electrode 330. The interlayer insulating film 332 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride, or an organic insulating material such as benzocyclobutene or photo-acryl.

The interlayer insulating film 332 has first and second contact holes 334 and 336 exposing both sides of the semiconductor layer 322. The first and second contact holes 334 and 336 are located on both sides of the gate electrode 330 and are spaced apart from the gate electrode 330 .

Here, the first and second contact holes 334 and 336 are also formed within the gate insulating film 324. Alternatively, when the gate insulating film 324 is patterned to have the same shape as the gate electrode 330, the first and second contact holes 334 and 336 may be formed only within the interlayer insulating film 332.

A source electrode 340 and a drain electrode 342 made of a conductive material such as metal are formed on the interlayer insulating film 332.

The source electrode 340 and the drain electrode 342 are positioned spaced apart from each other around the gate electrode 330, and are provided on both sides of the semiconductor layer 322 through the first and second contact holes 334 and 336, respectively. come into contact with

The semiconductor layer 322, the gate electrode 330, the source electrode 340, and the drain electrode 342 form the thin film transistor (Tr), and the thin film transistor (Tr) is a driving element. ) functions as

The thin film transistor (Tr) has a coplanar structure in which the gate electrode 330, the source electrode 342, and the drain electrode 344 are located on the semiconductor layer 320.

In contrast, the thin film transistor (Tr) may have an inverted staggered structure in which the gate electrode is located at the bottom of the semiconductor layer and the source electrode and drain electrode are located at the top of the semiconductor layer. In this case, the semiconductor layer may be made of amorphous silicon.

Although not shown, gate wires and data wires intersect each other to define a pixel area, and a switching element connected to the gate wire and data wire is further formed. The switching element is connected to a thin film transistor (Tr), which is a driving element.

In addition, a power wire is formed parallel to and spaced apart from the data wire or the data wire, and a storage capacitor is further provided to maintain the voltage of the gate electrode of the thin film transistor (Tr), which is a driving element, constant during one frame. It can be configured.

A protective layer 350 having a drain contact hole 352 exposing the drain electrode 342 of the thin film transistor (Tr) is formed to cover the thin film transistor (Tr).

On the protective layer 350, a first electrode 360 connected to the drain electrode 342 of the thin film transistor (Tr) through the drain contact hole 352 is formed separately for each pixel area. The first electrode 360 may be an anode and may be made of a conductive material with a relatively high work function value. For example, the first electrode 360 may be made of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO). .

A reflective electrode or a reflective layer may be formed on or below the first electrode 360 to increase light efficiency. For example, the reflective electrode or the reflective layer may be made of aluminum-palladium-copper (APC) alloy. The first electrode 360 may have a triple layer structure of ITO/APC/ITO.

Additionally, a bank layer 366 is formed on the protective layer 350 to cover the edge of the first electrode 360. The bank layer 366 exposes the center of the first electrode 360 corresponding to the pixel area.

A light emitting layer 362 is formed on the first electrode 360. The light-emitting layer 362 may have a single-layer structure of an emitting material layer made of a light-emitting material. In addition, in order to increase luminous efficiency, the light-emitting layer 362 includes a hole injection layer, a hole transport layer, a light-emitting material layer, and an electron transport layer ( It may have a multi-layer structure of an electron transporting layer and an electron injection layer.

The light-emitting material layer may include an inorganic light-emitting material such as quantum dots, or an organic light-emitting material.

A second electrode 364 is formed on the plastic substrate 310 on which the light emitting layer 362 is formed. The second electrode 364 is located in front of the display area and is made of a conductive material with a relatively low work function value and can be used as a cathode. For example, the second electrode 364 may be made of any one of aluminum (Al), magnesium (Mg), and aluminum-magnesium alloy (AlMg).

The first electrode 360, the light emitting layer 362, and the second electrode 364 form a light emitting diode (D).

Although not shown, an encapsulation film may be formed on the second electrode 364 to prevent external moisture from penetrating into the light emitting diode (D). The encapsulation film may have a stacked structure of a first inorganic insulating layer, an organic insulating layer, and a second inorganic insulating layer, but is not limited to this. Additionally, a polarizing plate (not shown) may be attached on the encapsulation film to reduce external light reflection. For example, the polarizer may be a circular polarizer.

Referring again to FIGS. 2A and 2B, the cover window 170 is provided with a light-shielding pattern 172 therein and has a lower surface corresponding to the display surface side of the display panel 101 and an upper surface opposite thereto. Everything is flat.

The cover window 170 may be made of tempered glass or high-hardness plastic. For example, the cover window 170 may be made of plastic such as silicone epoxy resin or bis-phenol A (bis-phenol A) epoxy resin, and may contain a hardener.

The light blocking pattern 172 is located at the edge of the cover window 170 and prevents light from leaking from the edge of the display panel 101. The light blocking pattern 172 has the same thickness as the cover window 170 to prevent light leakage not only from the edge of the display surface of the display device 100 but also from the side edge of the display device 100.

The light blocking pattern 172 is formed by irradiating light (UV) to the cover window 170.

5A and 5B are schematic cross-sectional views illustrating a manufacturing process of a cover window for a display device according to a first embodiment of the present invention.

As shown in FIG. 5A, after preparing a base 170a containing a photochromic material 174 at the edge, a mask (not shown) is placed in the center of the base 170a, as shown in FIG. 5B. UV is irradiated to the edge of the base 170a while placed at the top. Accordingly, the photochromic material 174 may change color to form a cover window 170 with a light blocking pattern 172 formed therein.

The photochromic material 174 is irreversibly discolored by UV irradiation. For example, PMS1797U (Red, QCR solution company), PMS2995U (Blue, QCR solution company), and PMS1495U (Yellow, QCR solution company) may be used as the photochromic material 174. The photochromic material 174 may be added in an amount of about 1 to 10 wt% based on the base material 170a.

In the present invention, since the light blocking pattern 172 is formed by changing the color of the photochromic material 174 located inside the base 170a, the problem of the level difference of the cover window 170 caused by the light blocking pattern 172 is solved. does not occur

Referring again to FIG. 2B, the cover window 170 including the light blocking pattern 172 is attached to the display panel 101 through the adhesive layer 180.

The adhesive layer 180 is attached to the cover window 170 in the form of a film (or sheet). With the adhesive layer 180 attached to the cover window 170, the adhesive layer 180 is attached to the display panel 101 so that the cover window 170 is attached to the display surface of the display panel 101. A display device 100 is provided. The adhesive layer 180 may be an optically clear adhesive (OCA) made of an acrylate compound.

In the display device 100 according to the first embodiment of the present invention, the light blocking pattern 172 is provided inside and the cover window 170 has a flat surface. Accordingly, the adhesion between the cover window 170 and the display panel 101 is improved, thereby improving the durability of the display device 100.

However, light leakage may occur at the edge of the display device 100 according to the first embodiment of the present invention, which may cause a problem in which display quality deteriorates.

That is, referring to FIG. 6, which is a diagram for explaining the light leakage problem occurring in the display device according to the first embodiment of the present invention, UV is irradiated to the edge of the cover window 170 including the photochromic material 174. The light blocking pattern 172 is formed. UV is blocked by the photochromic material 174 on the upper side of the cover window 170, and the amount of UV irradiated to the photochromic material 174 on the lower side of the cover window 170 is reduced. decreases.

Accordingly, the light blocking characteristics are deteriorated at the lower side of the cover window 170, and light (L) leaks through the edge of the display device (100 in FIG. 2B), that is, a light leakage problem occurs.

In addition, the light blocking characteristics of the lower side of the cover window 170 can be increased by irradiating a very large amount of UV for a long time, but in this case, the characteristics of the cover window 170 and the adhesive layer (180 in FIG. 2B) may be deteriorated. .

For example, due to excessive UV irradiation, the cover window 170 may become brittle and the adhesive strength of the adhesive layer 180 may decrease.

Figure 7 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention.

As shown in FIG. 7, the display device 400 according to the second embodiment of the present invention includes a display panel 401 and is located in front of the display panel 401, that is, on the display surface side. It includes a cover window 470 having a light-shielding pattern 472 therein, and an adhesive layer 480 that attaches the cover window 470 and the display panel 401.

Additionally, the display device 400 may further include a frame 490 that covers the back and side surfaces of the display panel 401.

In contrast, the frame 490 may cover only the side surface of the display panel 401. Additionally, the cover window 470 may be attached to the display panel 401 without the frame 490.

For example, the display panel 401 may be a liquid crystal panel or a light emitting diode panel.

When the display panel 401 is a liquid crystal panel, as shown in FIG. 3, the first and second substrates 210 and 250 face each other and between the first and second substrates 210 and 250. It may include a liquid crystal layer 260 interposed and including liquid crystal molecules 262, a pixel electrode 240, and a common electrode 242.

Meanwhile, when the display panel 401 is a light-emitting diode panel, as shown in FIG. 4, a light-emitting diode (D) located on the substrate 310 is connected to the light-emitting diode (D) and the substrate 310 ) and a thin film transistor (Tr) located between the light emitting diode (D).

The cover window 470 is provided with a light-shielding pattern 472 therein, so that both the lower surface corresponding to the display surface side of the display panel 401 and the upper surface opposite thereto are flat.

The cover window 470 may be made of tempered glass or high-hardness plastic. For example, the cover window 470 may be made of plastic such as silicone epoxy resin or bis-phenol A (bis-phenol A) epoxy resin.

The light blocking pattern 472 includes a horizontal portion 474 and a vertical portion 476 connected to one end of the horizontal portion 474. The horizontal portion 474 is located on the upper side of the cover window 470, and the vertical portion 476 is located at the side edge of the cover window 470. Along the direction of the display surface of the cover window 470, the horizontal portion 474 has a first length, and the vertical portion 476 has a second length smaller than the first length (corresponding to the width w of the vertical portion) ) has. That is, the light blocking pattern 472 has an “ㄱ” shape (or reverse-L shape).

Light leakage from the front edge of the display device 400 is blocked by the horizontal portion 474 of the light blocking pattern 472, and the side surface of the display device 400 is blocked by the vertical portion 476 of the light blocking pattern 474. Light leakage from the edges is blocked.

The light blocking pattern 472 is formed by irradiating light (UV) to the cover window 470.

8A to 8C are schematic cross-sectional views for explaining the manufacturing process of a cover window for a display device according to a second embodiment of the present invention.

As shown in FIG. 8A, a base 470a containing a photochromic material 478 at the edge is prepared.

The photochromic material 478 is irreversibly discolored by UV irradiation. For example, PMS1797U (Red, QCR solution company), PMS2995U (Blue, QCR solution company), and PMS1495U (Yellow, QCR solution company) may be used as the photochromic material 478. The photochromic material 174 may be added in an amount of about 1 to 10 wt% based on the base material 470a.

Next, as shown in FIG. 8B, UV is irradiated to the edge of the base 470a with a mask (not shown) placed on the upper front center of the base 470a. (First UV irradiation process) Accordingly, the photochromic material 478 on the upper side of the base 470a is discolored to form the horizontal portion 474.

Next, as shown in FIG. 8C, UV is irradiated to the side of the base 470a. (Second UV irradiation process) Accordingly, the photochromic material 478 at the edge of the base 470a is discolored to form the vertical portion 476, thereby manufacturing the cover window 470 of the present invention.

In the cover window 470 manufactured in this way, the horizontal part 474 forms a part of the upper surface, and the vertical part 476 forms a part of the lower surface and a side surface of the cover window 470. Meanwhile, the photochromic material 478 remains between the lower surface of the cover window 470 and the horizontal portion 474.

A case where a light-shielding pattern (A type) of the same shape as Example 2 was formed on a cover window made of silicone epoxy with a photochromic material (PMS1797U, 3 wt%) added to the edge, and a light-shielding pattern (A type) of the same shape as Example 1 ( When forming type B, the transmittance, OD (optical density) value, and whether light leakage occurred were measured and listed in Table 1 below.

[Table 1]

As shown in Table 1, the cover window including the B type shading pattern has an OD value that is substantially the same as or greater than the OD value of the cover window including the A type shading pattern. However, as the thickness of the cover window increases, light leakage occurs.

That is, as described above, since the photochromic material does not smoothly photochromize on the lower side of the cover window according to the first embodiment of the present invention, a problem of light leakage through the side edge of the display device occurs. However, in the cover window according to the second embodiment of the present invention, such light leakage problem is prevented.

8B and 8C, after the first UV irradiation process for forming the horizontal portion 474, a second UV irradiation process for forming the vertical portion 476 is performed. Alternatively, a UV irradiation process for forming the horizontal portion 474 may be performed after the UV irradiation process for forming the vertical portion 476. Additionally, the first and second UV irradiation processes may be performed simultaneously.

The total amount of UV irradiated in the first and second UV irradiation processes is smaller than the amount of UV irradiated to form the light-shielding pattern 172 according to the first embodiment of the present invention. Therefore, damage to the cover window 470 and the adhesive layer 480 due to excessive UV irradiation can be minimized.

The UV intensity or UV irradiation time of the second UV irradiation process is greater than the UV intensity or UV irradiation time of the first UV irradiation process, and accordingly, the width w of the vertical portion 476 is greater than the UV irradiation time of the first UV irradiation process. It may be greater than the thickness (t) of (474). The horizontal part 474 has a thickness smaller than the cover window 470, and the vertical part 476 has the same thickness as the cover window 470.

Since the first UV irradiation process is performed on the entire surface of the cover window 470, damage to the adhesive layer 480 may occur if the amount of UV irradiation in the first UV irradiation process is large, but the second UV irradiation process may cause damage to the adhesive layer 480. In the process, the adhesive layer 480 is not irradiated with UV light. Therefore, by increasing the UV irradiation amount of the second UV irradiation process to be greater than the UV irradiation amount of the first UV irradiation process, the light blocking characteristics of the light blocking pattern 472 can be improved without damaging the adhesive layer 480.

For example, in the first UV irradiation process, UV having a wavelength of 365 nm and a first intensity of 1.35 mW/cm2 is irradiated for the first time, and in the second UV irradiation process, UV of the same wavelength and the same intensity is irradiated for the first time. It can be irradiated for a second time greater than one hour. Alternatively, in the second UV irradiation process, UV having a second intensity greater than the first intensity may be irradiated for the first time.

In the present invention, since the light blocking pattern 472 is formed by changing the color of the photochromic material 478 located inside the base 470a, the problem of the level difference of the cover window 470 caused by the light blocking pattern 472 is solved. does not occur Therefore, there is no problem of deterioration of adhesion due to the step of the cover window 470.

Referring again to FIG. 7 , the cover window 470 including the light blocking pattern 472 is attached to the display panel 101 through the adhesive layer 480.

The adhesive layer 480 is attached to the cover window 470 in the form of a film (or sheet). With the adhesive layer 480 attached to the cover window 470, the adhesive layer 480 is attached to the display panel 401 so that the cover window 470 is attached to the display surface of the display panel 401. A display device 400 is provided.

In the display device 400 according to the second embodiment of the present invention, the light blocking pattern 472 is provided inside and the cover window 470 has a flat surface. Accordingly, the adhesion between the cover window 470 and the display panel 401 is improved, thereby improving the durability of the display device 400.

In addition, since the light-shielding pattern 472 consisting of the horizontal part 474 and the vertical part 476 is formed by the UV irradiation process on the front and side surfaces of the cover window 470, the cover window 472 is formed by excessive UV irradiation. Light leakage problems of the display device 400 can be prevented without damaging the 470 and the adhesive layer 480.

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art may modify the present invention in various ways without departing from the technical spirit and scope of the present invention as set forth in the claims below. and that it can be changed.

100, 400: display device 101, 401: display panel
170, 470: Cover window 172, 472: Light blocking pattern
174, 478: Photochromic material 180, 480: Adhesive layer
190, 490: frame 474: horizontal part
476: vertical part

Claims (12)

with base;
It includes a light-shielding pattern located on an inner edge of the base and has a flat upper and lower surfaces,
A cover window wherein the light blocking pattern has a horizontal portion and a vertical portion connected to the horizontal portion, and a photochromic material is included between one surface of the base and the horizontal portion.

delete According to claim 1,
A cover window wherein the horizontal portion has a thickness less than that of the base, and the vertical portion has a thickness equal to that of the base.

delete According to claim 1,
A cover window wherein the horizontal portion forms a portion of the upper surface of the base, and the vertical portion forms a portion and a side surface of the lower surface of the base.
According to claim 1,
A cover window wherein the width of the vertical portion is greater than the thickness of the horizontal portion.
According to claim 1,
A cover window wherein, along the surface direction of the base, the horizontal portion has a greater length than the vertical portion.
a display panel;
a cover window of any one of claims 1, 3, and 5 to 7 located on one side of the display panel;
Adhesive layer located between the display panel and the cover window
A display device including a.
a display panel;
Located on one side of the display panel, it includes a base; a cover window including a light-shielding pattern located on an inner edge of the base and having flat upper and lower surfaces;
Comprising an adhesive layer located between the display panel and the cover window,
The light blocking pattern has a horizontal portion and a vertical portion connected to the horizontal portion, and the vertical portion is located between the display panel and the horizontal portion,
A display device comprising a photochromic material between one surface of the base and the horizontal portion.
preparing a base including a photochromic material at the edge and having a top surface, a bottom surface, and a side surface;
a first UV irradiation step of irradiating first UV to the edge from the upper surface side;
A second UV irradiation step of irradiating a second UV to the edge from the side side,
In the first UV irradiation step, the photochromic material on the upper surface is discolored to form a horizontal portion of the light-shielding pattern,
In the second UV irradiation step, the photochromic material on the side is discolored to form a vertical portion of the light blocking pattern.
According to claim 10,
A method of manufacturing a cover window, wherein the intensity of the second UV is greater than the intensity of the first UV.
According to claim 10,
A method of manufacturing a cover window, wherein the irradiation time of the second UV in the second UV irradiation step is greater than the irradiation time of the first UV in the first UV irradiation step.

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