KR101449621B1 - Display device and manufacturing method thereof - Google Patents

Abstract

A display device includes a display panel having a display region in which an image is displayed and a non-display region provided on at least one side of the display region, and a light-shielding region corresponding to the display region and a shielding region corresponding to the non- A black matrix layer provided on a surface of the window base in the direction of the display panel in the light shielding region; a step relaxation portion disposed in contact with the black matrix layer in the light transmitting region; And an adhesive layer provided between the window member having the step reducing portion and the display panel.

Description

DISPLAY APPARATUS AND MANUFACTURING METHOD THEREOF [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a display device and a manufacturing method thereof, and more particularly to a display device capable of suppressing bubble generation when a window is bonded to a display panel, and a manufacturing method thereof.

The display device may include a display panel, a case accommodating the display panel, and a window protecting the display panel.
The window serves to protect the display panel from being broken by an external impact. The window is opposed to the display panel on the display panel and covers the display area and the peripheral area of the display panel.
A portion of the window where information is not displayed through the display panel is provided with a black matrix layer so that the inside of the display device is not visible.
The window having the black matrix layer is attached to the display panel through an adhesive layer.
However, when the adhesive layer is adhered to the window, bubbles are generated between the adhesive layer and the window due to the step due to the black matrix layer.

1. Japanese Laid-Open Patent Publication No. 2011-022523 (Mar. 23, 2011) 2. Japanese Patent Application Laid-Open No. 2000-181368 (June 30, 2000)

Disclosure of the Invention An object of the present invention is to suppress generation of air bubbles between a display panel and the adhesive layer when a window is adhered to a display panel using an adhesive layer.

The present invention relates to a display panel, a display panel, a window base provided opposite to the display panel, a black matrix layer and a step difference modifier provided on other areas of the window base and in contact with each other, And an adhesive layer for adhering the window member provided with the step reducing portion to the display panel.

The step relaxation portion may have a triangular shape in cross section perpendicular to one surface in contact with the black matrix layer or a curved surface in contact with the adhesive layer.

After the black matrix layer is provided in the window base, the black matrix layer may be plasma treated.

It is possible to suppress the occurrence of bubbles in the module of the display device according to the present invention, thereby reducing the product defects and slimming down the product thickness.

1 is an exploded perspective view of a display device according to the present invention.
2 is a cross-sectional view of the display apparatus shown in FIG. 1 according to an embodiment of the present invention.
3 is a cross-sectional view of a window member according to one embodiment.
4 is a partially cutaway perspective view of the window member shown in Fig.
5 and 6 are flowcharts of a method of manufacturing a display device according to an embodiment.
7 is a cross-sectional view of a window member according to another embodiment.
8 is a partially cutaway perspective view of the window member shown in Fig.

The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the degree of the structures is enlarged in actuality for clarity of the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, where a section such as a layer, a film, an area, a plate, or the like is referred to as being "on" another section, it includes not only the case where it is "directly on" another part but also the case where there is another part in between. On the contrary, where a section such as a layer, a film, an area, a plate, etc. is referred to as being "under" another section, this includes not only the case where the section is "directly underneath"

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a display device according to the present invention.

1, the display device 10 of the present invention includes a display panel 100, a housing 200 for accommodating the display panel 100, a display panel 100 disposed between the display panel 100 and the housing 200, A window member 400 disposed on the display panel 100 and an adhesive layer 500 disposed between the display panel 100 and the window member 400.

The display panel 100 can display an image. The display panel 100 is not particularly limited. For example, as the display panel 100, it is possible to use a spontaneous display panel such as an organic light emitting display panel. The display panel 100 may include a liquid crystal display panel, an electrowetting display panel, an electrophoretic display panel, a microelectromechanical system display panel It is possible to use a non-luminescent display panel. When the non-luminous display panel is used as the display panel 100, the display device 10 may include a backlight unit for supplying light to the display panel 100. [

The display panel 100 includes a display area DA for displaying an image and a non-display area NDA for displaying no image. The non-display area NDA surrounds the display area DA.

The housing 200 accommodates the display panel 100. FIG. 1 exemplarily shows a housing 200 composed of a single member provided with a space capable of accommodating the display panel 100. However, the housing 200 may be constructed by combining two or more members.

In addition, the housing 200 may further include a circuit board (not shown) having a driving element mounted thereon in addition to the display panel 100. In addition, a power unit (not shown) such as a battery may be further accommodated depending on the type of the display device 10.

The shock absorbing sheet 300 is disposed between the display panel 100 and the housing 200 to absorb an external impact that may be applied to the display panel 100. Therefore, the shock-absorbing sheet 300 prevents an external impact from acting on the display panel 100 directly.

The window member 400 is disposed in a direction in which an image is emitted from the display panel 100 and is coupled to the housing 200 to form an outer surface of the display device 10 together with the housing 200 .

The window member 400 includes a light transmitting region LTA through which light is transmitted and a light shielding region SA surrounding the light transmitting region LTA and blocking light.

Further, at least a part of the light shielding area SA may be defined as an input icon area IIA. The input icon area IIA can be activated when the display device 10 operates in a specific mode.

The adhesive layer 500 is provided between the display panel 100 and the window member 400 so that the display panel 100 and the window member 400 can be tightly coupled.

The display device 10 may further include a polarizing plate and a touch screen panel. When the polarizing plate is provided, the polarizing plate may be positioned on the display panel 100. The polarizing plate prevents the display performance of the display panel 100 from being degraded due to reflection of light incident from the outside, and improves the visibility and the like in terms of the viewer.

When the display device 10 includes a touch screen panel, the touch panel may be provided on the display panel 100. More precisely, the touch screen panel may be provided between the display panel 100 and the polarizing plate, if the polarizing plate is further provided in the display device 10.

FIG. 2 is a cross-sectional view according to an embodiment of the display device shown in FIG. 1, and FIG. 3 is a cross- 4 is a partially cutaway perspective view of the window member shown in Fig. 3. Fig.

2 to 4, in the display device 10, the housing 200 can receive the display panel 100. An impact-absorbing sheet 300 is disposed between the display panel 100 and the housing 200. The display panel 100 is attached to the window member 400 through the adhesive layer 500.

The window member 400 includes a window base 410, a black matrix layer 420, and a step relaxation part 430.

The window base 410 may have a rectangular plate shape, and the vicinity of a vertex of the plate may be rounded. At this time, the window base 410 may be made of a plastic material such as acrylic having impact resistance or a glass material.

The window base 410 includes a light transmitting region LTA through which light is transmitted in a plane and a light shielding region SA surrounding the light transmitting region LTA. The light is not transmitted through the shielding area SA. Therefore, the light-shielding area SA can be formed in such a manner that the viewer can see the image of the display panel 100, while the light-transmissive area LTA can transmit the light generated in the display panel 100, ) Can not be seen. That is, the light-transmissive area LTA corresponds to the display area DA of the display panel 100, and the light-shielding area SA corresponds to the non-display area NDA of the display panel 100, respectively.

The black matrix layer 420 is disposed in the light shielding area SA. More precisely, the black matrix layer 420 is provided on the surface of the window base 410 in the direction of the display panel 100 in the light shielding area SA.

The step reducing portion 430 can alleviate the step of the black matrix layer. The step reducing portion 430 may be arranged in the light transmitting region LTA in contact with the black matrix layer 420.

The step reducing portion 430 is thicker than a portion of the step reducing portion 430 that is in contact with the black matrix layer 420 in the center direction of the light transmitting region LTA. More specifically, the step reducing portion 430 may have a sloped surface in contact with the adhesive layer 500, which will be described later. Accordingly, the step reducing portion 430 may have a triangular shape in cross section perpendicular to the one surface contacting the black matrix layer 420 and perpendicular to the window base 410.

The step reducing portion 430 may include a transparent liquid adhesive.

The adhesive layer 500 is provided between the surface of the window member 400 on which the black matrix layer 420 and the step reducing portion 430 are provided and the display panel 100. Accordingly, the adhesive layer 500 can be provided in a state where the display panel 100 and the window member 400 are tightly coupled. When the polarizing plate is provided on the display panel 100, the adhesive layer 500 may be provided between the polarizing plate and the window member 400.

At this time, the adhesive layer 500 may be an optically clear adhesive (OCA) to prevent the brightness of an image emitted from the display panel 100 from being reduced. For example, the adhesive layer 500 may include a transparent polymer resin that is tacky and can be cured as light or heat, and may be a double-sided tape.

The index of refraction of the adhesive layer 500 may be the same as the index of refraction of the stepped portion 430 so that the visibility of the viewer is not deteriorated as the index of refraction of the adhesive layer 500 differs from that of the stepped portion 430 .

As the step reducing portion 430 is provided on the window member 400, bubble generation can be suppressed when the adhesive layer 500 is disposed. More precisely, since the inclination of the surface of the adhesive layer 500 in contact with the step reducing portion 430 is gentle, the adhesive layer 500 can evenly cover the entire surface of one surface of the window member 400, The occurrence can be suppressed.

That is, when the step relaxation part 430 is not provided, the window base 410 on which the black matrix layer 420 is formed has a stepped shape. That is, a step is formed between the window base 410 and the black matrix layer 420. In this case, when the adhesive layer 500 is provided, the adhesive layer 500 does not completely cover the black matrix layer 420 and the light-transmitting region LTA. That is, on one side of the window member 400 covered with the adhesive layer 500, a void space in which the adhesive layer 500 is not provided is generated. The bubbles are disposed in the empty space, which results in lowering the visibility as the refractive index of the bubbles differs from the refractive index of the adhesive layer 500 and the window base 410, which is not preferable.

The thickness of the adhesive layer 500 is increased to increase the adhesion of the adhesive layer 500 to the window base 410 to suppress the generation of bubbles between the window member 400 and the adhesive layer 500 . However, in recent trends of slimmer display device 10 being accelerated, thickening of the adhesive layer 500 is an obstacle to slimming down the device. Therefore, it was important to suppress the generation of bubbles without increasing the thickness of the adhesive layer 500.

When the step reducing portion 430 is provided according to an embodiment of the present invention, the surface of the step reducing portion 430, which is in contact with the adhesive layer 500, has a gentle and flat inclined surface, (Not shown). Therefore, when the adhesive layer 500 covers one surface of the window member 400, it is possible to uniformly cover the entire surface. As a result, no voids are formed between the adhesive layer 500 and one surface of the window member 400, so that the generation of bubbles is suppressed. Therefore, the visibility is not reduced, and the adhesive layer 500 can effectively cover the window member 400 without increasing the thickness of the adhesive layer 500.

Hereinafter, a method of manufacturing a display device according to an embodiment of the present invention will be described. In the following description, in order to avoid overlapping description with the embodiment described above, differences will be mainly described.

5 and 6 are flowcharts of a method of manufacturing a display device according to an embodiment of the present invention and another embodiment. Here, the manufacturing method of the display device will be described with reference to the display device shown in Figs. 1 to 4 together with Fig. 5 and Fig.

5 and 6, a method of manufacturing the display device 10 according to an embodiment of the present invention includes a window member forming step S1, an adhesive layer forming step S2, And attaching the panel and the window member (S3). The window member forming step S1 includes a window base preparing step S11, a black matrix layer forming step S12, and a step reducing part forming step S13.

In the window base preparation step S11, the window base 410 is prepared. The window base 410 may be made of a plastic material such as acrylic having impact resistance or a glass material. In addition, the window base 410 includes a light transmitting region LTA through which light is transmitted in a plane and a light shielding region SA surrounding the light transmitting region LTA.

The black matrix layer forming step S12 is formed on the surface of the window base 410 in the direction of the display panel 100 on the light shielding area SA. The black matrix layer 420 may be formed by patterning using a mask from a photosensitive film.

After the black matrix layer 420 is formed, the surface of the black matrix layer 420 may be plasma-treated.

In the step reducing portion forming step S13, the step reducing portion 430 disposed in contact with the black matrix layer 420 in the light transmitting region LTA is formed. Here, the step relaxation portion contacts the entire area of the surfaces of the black matrix layer 420 at the boundary between the light-shielding area SA and the light-transmitting area LTA in a part of the light-transmitting area LTA, Region LTA. The step reducing portion 430 is thicker than a portion of the step reducing portion 430 that is in contact with the black matrix layer 420 in the center direction of the light transmitting region LTA.

When the step reducing part 430 is provided as a transparent liquid adhesive, it may further include irradiating light or applying heat to cure the liquid level step reducing part 430. In the step reducing portion 430 after curing, the surface in contact with the adhesive layer 500 becomes an inclined surface.

The shock absorbing sheet 300 and the display panel 100 can be sequentially housed in the housing 200 when the window member 400 is completed.

In the adhesive layer forming step (S2), the adhesive layer (500) is formed on the display panel (100). That is, the adhesive layer 500 is formed on the exposed surface of the display panel 100. On the other hand, when the polarizing plate is provided on the display panel 100, the optical transparent adhesive may be formed on the surface exposed to the outside of the polarizing plate to form the adhesive layer 500.

In the display panel and the window member attaching step S3, the display panel 100 on which the adhesive layer 500 is formed is attached to the window member 400 (S3).

When the liquid crystal transparent polymer resin is used as the adhesive layer 500, heat is applied to the adhesive layer 500 after attaching the display panel 100 and the window member 400 to the adhesive layer 500, It can be cured.

According to the manufacturing method of the embodiment described above, when the black matrix layer 420 is formed on the window base 410 and the step reducing portion 430 is formed, the adhesive layer 500 is formed on the window member 400, The effect of suppressing the generation of bubbles can be seen. A similar effect can be obtained by plasma-treating the black matrix layer 420 after forming the black matrix layer 420, and then forming the step reducing portion 430. That is, since the adhesive layer 500 is adhered to one surface of the window member 400 more closely, the occurrence of voids between one side of the adhesive layer 500 and the window member 400 is reduced , The volume of the empty space is reduced. Accordingly, bubbles disposed in the empty space are reduced, the product defect rate is reduced, and the adhesive layer 500 is not required to be thicker, so that the product thickness can be reduced.

Hereinafter, a display device according to another embodiment of the present invention will be described. In the following description, the same or similar elements as those shown in Figs. 1 to 6 are denoted by the same reference numerals, and a detailed description thereof will be omitted. Also, to avoid redundant explanations, the differences should be emphasized.

FIG. 7 is a sectional view of the window member according to another embodiment, and FIG. 8 is a partially cutaway perspective view of the window member shown in FIG. Here, the manufacturing method according to another embodiment of the display device will be described with reference to the display device shown in Figs. 1 and 2 together with Figs. 7 and 8. Fig.

Referring to FIGS. 7 and 8, the window member 400 includes a window base 410, a black matrix layer 420, and a step relaxation part 440.

The step difference modifying part 440 is different from the above embodiment in that the step reducing part 440 is an inclined surface having a curved surface in contact with the adhesive layer 500. For example, the step reducing portion 440 may have a convex shape with respect to a direction extending from the window base 410 to the black matrix layer 420.

Alternatively, the step reducing portion 440 may have a concave shape with respect to the one direction. That is, since the step reducing portion 440 is provided in a transparent liquid form, the final shape after curing can be changed to a desired shape. Even if the final shape of the step reducing portion 440 is provided differently from the one embodiment and the other embodiment, the step reducing portion 440 may alleviate the step of the black matrix layer 420, Any shape can be used as long as the adhesive layer 500 can be provided so as not to generate a void space when adhering to the window member 400.

Hereinafter, a method of manufacturing the display device 10 according to another embodiment of the present invention will be described with reference to FIGS. 1 and 2, except that the step reducing portion 440 is formed of a curved surface in contact with the adhesive layer 500 So it is omitted.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications and changes may be made thereto without departing from the scope of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

10: Display device 100: Display panel
200: housing 300: shock-absorbing sheet
400: window member 410: window base
420: black matrix layer 430, 440:
500: adhesive layer SA: shielding area
LTA: Emissive area IIA: Input icon area
DA: display area NDA: non-display area

Claims (12)

A display panel having a display area in which an image is displayed and a non-display area provided on at least one side of the display area;
A window member disposed in a direction in which an image is emitted from the display panel; And
And an adhesive layer disposed between the display panel and the window member,
The window member
A window base having a light-transmitting region corresponding to the display region and a light-shielding region corresponding to the non-display region;
A black matrix layer provided on a surface of the window base in the direction of the display panel in the light shielding region; And
And a step relaxation part provided to extend to the light-transmissive area while being in contact with the surfaces of the black matrix layer at the boundary between the light-shielding area and the light-transmissive area in a part of the light-
Wherein the step reducing portion has a maximum thickness at a portion in contact with the black matrix layer,
Wherein a thickness of the step reducing portion is thicker than a portion of the step reducing portion that is in contact with the black matrix layer is located in a center direction of the light transmitting region. The method according to claim 1,
Wherein the step reducing portion has an inclined surface in contact with the adhesive layer. The method according to claim 1,
Wherein the step reducing portion is an inclined surface having a curved surface in contact with the adhesive layer. The method according to claim 1,
Wherein the step reducing portion is a transparent liquid adhesive. The method according to claim 1,
Wherein the step reducing portion and the adhesive layer have the same refractive index. Forming a window member;
Forming an adhesive layer on the display panel; And
And attaching the one surface of the display panel on which the adhesive layer is formed and the window member,
The step of forming the window member
Preparing a window base having a light-transmitting region and a light-blocking region surrounding the light-transmitting region;
Forming a black matrix layer on one side of the window base in the shielding region; And
Forming a step relaxation portion in a part of the light-projecting region so as to extend to the light-projecting region while being in contact with the surfaces of the black matrix layer at the boundary between the light-shielding region and the light-
Wherein the step reducing portion has a maximum thickness at a portion in contact with the black matrix layer,
Wherein a thickness of the step reducing portion is thicker than a portion of the step reducing portion that is in contact with the black matrix layer and is located in a center direction of the light transmitting region. The method according to claim 6,
Wherein the step reducing portion has an inclined surface in contact with the adhesive layer. The method according to claim 6,
Wherein the step reducing portion is formed of an inclined surface having a curved surface in contact with the adhesive layer. The method according to claim 6,
Wherein the step reducing portion is a transparent liquid adhesive. The method according to claim 6,
Wherein the step reducing portion and the adhesive layer have the same refractive index. The method according to claim 6,
Further comprising the step of plasma-treating the black matrix layer. The method according to claim 6,
Wherein the adhesive layer is an optically clear adhesive (OCA).

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