KR20210025308A - Display device having glass diffuser plast - Google Patents

Abstract

The present invention relates to a display device capable of implementing a narrow bezel and having an improved aperture ratio and luminance. The display device includes: a display panel; a glass diffusion plate disposed under the display panel; a frame supporting the glass diffusion plate; a lower cover coupled to the frame; and an adhesive tape attached to a lower surface or an upper surface of the glass diffusion plate and a side surface of the frame to fix the glass diffusion plate to the frame.

Description

Display device equipped with a glass diffusion plate {DISPLAY DEVICE HAVING GLASS DIFFUSER PLAST}

The present invention relates to a display device, and more particularly, to a display device having a glass diffusion plate.

In recent years, as various portable electronic devices such as mobile phones, PDAs, and notebook computers are developed, the demand for a flat panel display device for light, thin and short that can be applied thereto is gradually increasing. As such flat panel display devices, liquid crystal display devices, plasma display devices, organic electroluminescent display devices, and electrophoretic display devices have been actively studied. Currently, liquid crystal displays (LCDs) are widely used because of the realization of a large-area screen.

Such a liquid crystal display device is a non-light-emitting display device and displays an image by controlling the transmittance of light supplied from a backlight unit.

In general, the backlight is composed of an edge type and a direct type. In the edge-type backlight, a light guide plate is provided, and a light source is disposed on the side of the light guide plate, so that light output from a light source as a point light source is guided inside the light guide plate and is output to a surface light source through an upper surface to be supplied to the display panel. In this case, an optical sheet is provided between the light guide plate and the liquid crystal panel to improve the efficiency of light supplied from the light guide plate to the liquid crystal panel.

In a direct type backlight, a light source is disposed under the display panel, and light output from the light source is directly supplied to the display panel through an optical sheet such as a diffusion sheet.

As described above, in the conventional liquid crystal display device, since it is composed of many components such as a light source, a light guide plate, and an optical sheet, there is a limit in reducing weight and thickness. Moreover, when high-temperature heat generated from a light source is transferred to a light guide plate or an optical sheet, etc., there is a problem in that the light guide plate or an optical sheet is deformed and optical properties are deteriorated.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a display device having a glass diffusion plate to reduce weight and thickness, and to prevent deformation due to high temperature.

Another object of the present invention is to provide a display device capable of improving the aperture ratio and luminance by attaching an adhesive tape to the side of the frame to fix the glass diffusion plate to the frame, thereby minimizing the contact area between the glass diffusion plate and the frame. .

The present invention has been made in view of the above points, comprising: a display panel; A glass diffusion plate disposed under the display panel; A frame supporting the glass diffusion plate; A lower cover coupled to the frame; And an adhesive tape attached to a lower surface or an upper surface of the glass diffusion plate and a side surface of the frame to fix the glass diffusion plate to the frame.

The frame includes a coupling portion coupled to the lower cover and a support portion supporting the glass diffusion plate, and a reflective member is provided on a surface of the support portion facing the light source to reflect light incident from the light source to the display panel.

The support portion of the frame is formed in a curved surface and a step is formed in the setting area, so that the light incident from the light source is uniformly reflected to the entire area of the glass diffusion plate.

The adhesive tape is formed between a first adhesive region adhered to a lower surface or an upper surface of the glass diffusion plate, a second adhesive region adhered to a side surface of the frame, and the first adhesive region and the second adhesive region. And a bending line for bending the second bonding area, and the second bonding area of the adhesive tape extends to a side surface of the lower cover and is attached to the frame and side surfaces of the lower cover.

The first adhesive area of the adhesive tape is adhered to the lower surface of the glass diffusion plate, and an adhesive member is provided between the glass diffusion plate and the display panel to bond the glass diffusion plate and the display panel, and the adhesive tape is first adhered to each other. A region is attached to the upper surface of the glass diffusion plate and the display panel to bond the glass diffusion plate and the display panel.

A guide portion is formed on the upper surface of the corner region of the frame to guide the glass diffusion plate. In this case, the guide portion may be formed integrally with the frame or may be formed separately from the frame and attached to the frame.

In the present invention, since a glass diffuser plate is used instead of the conventional optical sheet to improve the efficiency of light supplied to the display panel, it is possible to reduce the weight and thickness of the display device, and to prevent defects due to variations in optical characteristics at high temperatures. .

In addition, in the present invention, an adhesive tape is attached to the side of the frame to fix the glass diffusion plate to the frame, thereby minimizing the contact area between the glass diffusion plate and the frame, thereby improving the aperture ratio and improving the brightness.

In addition, in the present invention, since the guide part is formed at the top edge of the frame fixing the display panel, the operator manually fixes the display panel to the frame or fixes the display panel to the frame using an inexpensive alignment device. The process is simplified and manufacturing costs can be reduced.

1 is an exploded perspective view of a display device according to a first embodiment of the present invention.
2 is a cross-sectional view of a display device according to a first embodiment of the present invention.
3 is a cross-sectional view of a glass diffusion plate of a display device according to a first exemplary embodiment of the present invention.
4 is a cross-sectional view showing the structure of a diffusion layer of a glass diffusion plate.
5A and 5B are diagrams illustrating light reflection when a frame of a display device has a linear shape and a curved shape, respectively.
6 is a cross-sectional view of a display device according to a second embodiment of the present invention.
7 is a plan view illustrating an adhesive tape of a display device according to a second exemplary embodiment of the present invention.
8A and 8B are graphs showing luminance of edge regions of the display device according to the first and second embodiments of the present invention, respectively.
9A and 9B are diagrams showing luminance of edge regions of the display device according to the first and second embodiments of the present invention, respectively.
10 is a diagram illustrating light reflection from a frame of a display device according to a second exemplary embodiment of the present invention.
11 is an exploded perspective view of a display device according to a third exemplary embodiment of the present invention.
12A and 12B are cross-sectional views taken along line A-A' and line B-B' of FIG. 11, respectively.
13A-13E are diagrams illustrating a method of assembling a display device according to a third exemplary embodiment of the present invention.
14 is a cross-sectional view of a display device according to a fourth exemplary embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to the possessor, and the invention is only defined by the scope of the claims.

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

1 is an exploded perspective view showing a liquid crystal display device 100 according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view.

1 and 2, the liquid crystal display device 100 according to the first embodiment of the present invention is composed of a liquid crystal panel 110 and a backlight, and the liquid crystal panel 110 and the backlight are frame 130 After being supported by ), the frame 130 and the lower cover 140 are combined to be assembled.

Although not shown in the drawing, the liquid crystal panel 110 is made of glass and includes a first substrate and a second substrate facing each other, and a liquid crystal layer disposed between the first and second substrates.

A plurality of gate lines and data lines are arranged vertically on the first substrate to define a plurality of pixels in a matrix shape, and each pixel is connected to a thin film transistor as a switching element and the thin film transistor to be turned on as the thin film transistor is turned on. A pixel electrode to which an image signal is applied is disposed. On the second substrate, a black matrix for blocking light transmission in an area where an image is not displayed, a color filter layer for realizing actual colors, and a common electrode are disposed.

In the liquid crystal display of this configuration, as a scan signal is applied to the thin film transistor through the gate line, the thin film transistor is turned on and activated. At the same time, the image signal is applied to the pixel electrode through the data line, and the pixel electrode and the common electrode are applied. An electric field is formed between them. In this case, an image can be realized by adjusting the transmittance of light passing through the liquid crystal layer by adjusting the electric field strength between the pixel electrode and the common electrode.

The common electrode is formed on the second substrate and forms an electric field perpendicular to the surface of the substrate in the liquid crystal layer together with the pixel electrode, thereby driving the liquid crystal display in TN (Twistic Nematic) mode or VA (Vertical Alignment) mode. . In addition, the pixel electrode and the common electrode are disposed on the first substrate to form an electric field substantially horizontal to the surface of the substrate in the liquid crystal layer, so that the liquid crystal display device is in the IPS (In Plane Switching) mode or the FFS (Fringe Field Switching) mode. It can also be driven by.

The backlight includes a light source 150, a light source substrate 152 on which the light source 150 is mounted, a reflective plate 154, and a glass diffusion plate 120.

An LED package (Light Emitting Diode Package) may be used as the light source 150, but is not limited thereto. In this case, the LED package may be an R, G, B LED package that emits monochromatic light of R (Red), G (Green), and B (Blue), or a W (White) LED package that emits white light.

A plurality of light source substrates 152 are disposed on the lower cover 140 at regular intervals, and a plurality of light sources 150 are mounted on each light source substrate 152 along one direction. Although not shown in the drawing, a conductive wiring connected to the light source 150 is formed on the light source substrate 152 so that an external signal is applied to the light source 150 so that the light source 150 emits light.

The reflective plate 154 is disposed on the lower surface 140a of the lower cover 140, reflects light emitted downward from the light source 150 and supplies it to the liquid crystal panel 110. A light source substrate 152 may be disposed on the reflective plate 154. In addition, a partial region of the reflective plate 154 may be removed, and the light source substrate 152 may be disposed in the removed region.

The glass diffusion plate 120 is disposed above the light source 150 by a predetermined distance. The glass diffuser plate 120 diffuses light incident from the light source 150 so that light having a uniform illuminance is supplied to the liquid crystal panel 110, thereby improving light efficiency and image quality of the liquid crystal display.

3 is a cross-sectional view illustrating a glass diffusion plate 120 provided in the liquid crystal display device 100 according to the first embodiment of the present invention.

As shown in FIG. 3, the glass diffusion plate 120 includes a glass substrate 122 made of transparent glass, a diffusion layer 123 disposed on a lower surface (ie, a light incident surface) of the glass substrate 122, and the It is composed of a luminance enhancing layer 125 disposed on the upper surface (ie, the light-exiting surface) of the glass substrate 122.

Since the glass substrate 122 has good thermal stability, it does not expand or contract by the high-temperature heat generated from the light source 150, so that the displacement of the optical characteristics of the diffusion plate due to heat can be minimized. In addition, since the gap between the glass diffusion plate 120 and the light source 150 can be minimized by such thermal stability, the liquid crystal display device 100 can be made thinner.

The diffusion layer 123 diffuses and outputs the light output from the light source 150 a plurality of times so that uniform light is supplied to the liquid crystal panel 110. The diffusion layer 123 may have various structures. For example, in the present invention, the diffusion layer 123 may be formed of a plurality of air diffusing layers as shown in FIG. 4.

That is, the diffusion layer 123 includes a plurality of transparent base films 123a and a plurality of protrusions 123b formed on the upper surface of each of the base films 123a. PC (polycabonate) or PET (polyethylene terephthalate) may be used as the base film 123a, but is not limited thereto. In addition, the protrusion 123b may be formed of a transparent resin.

The protrusion 123b is disposed between the base film 123a to form an air layer 123c between the base film 123a and the base film 123a. Since the refractive index of the PC is about 1.58 and the refractive index of PET is about 1.6, when light is incident from the light source 150, light is refracted at the interface between the base film 123a and the air layer 123c, and this refraction is caused by the diffusion layer 123 ) The incident light is repeated multiple times in the entire area and is output.

In this way, by configuring the diffusion layer 123 of the glass diffusion plate 120 to include the air layer 123c, it is possible to minimize the weight of the glass diffusion plate 120 and reduce the cost. However, the diffusion layer 123 of the glass diffusion plate 120 according to the present invention is not formed in a specific structure as described above, but may be formed in a different structure.

An adhesive layer 123d is provided on the upper surface of the diffusion layer 123 so that the diffusion layer 123 can be attached to the glass substrate 122.

The brightness enhancement layer 125 may be a Double Brightness Enchaned Film (DBEF), but is not limited thereto. The DBEF is a multilayer optical film in which hundreds of layers are overlapped so that the refractive index of the dielectric principal axis is completely matched to the other two kinds of polymer layers of A and B having a thickness of several hundred µm so that the refractive index in different directions is changed. Accordingly, it is possible to improve the luminance of light passing through the glass diffusion plate 120 by 30% or more.

The glass diffusion plate 120 is attached to the liquid crystal panel 110 by a transparent adhesive 114. At this time, the adhesive 114 is applied to the edge region of the glass diffusion plate 120 and attached to the liquid crystal panel 110.

Referring back to FIGS. 1 and 2, the liquid crystal panel 110 and the backlight are supported by the frame 130 and the lower cover 140 is assembled by combining the frame 130 to complete the liquid crystal display.

The lower cover 140 is formed of metal, but is not limited thereto. The lower cover 140 is composed of a lower surface 140a and a side surface 140b extending vertically from the edge of the four sides of the lower surface 140a, and a reflector 154 and a light source inside the lower surface 140a and the side surface 140b The light source substrate 152 on which the 150 is mounted is accommodated.

The lower cover 140 is preferably used as a metal having a high thermal conductivity so that heat generated from the light source 150 and the driving circuit can be discharged to the outside. For example, a metal such as aluminum, aluminum alloy, and stainless steel may be used as the lower cover 140.

The frame 130 is formed of metal to support the glass diffusion plate 120, but is not limited thereto and may be made of various materials. The frame 130 includes a first coupling portion 130a coupled to the lower surface 140a of the lower cover 140, a second coupling portion 130b coupled to the side surface 140b of the lower cover 140, and glass diffusion. It includes a support portion (130c) for supporting the plate 120 and the liquid crystal panel (110).

The first coupling portion 130a of the frame 130 coupled with the lower surface 140a of the lower cover 140 is disposed on the reflector 154. That is, since the reflector 154 is disposed under the first coupling portion 130a of the frame 130, the pressure in the downward direction of the first coupling portion 130a or the coupling force between the lower cover 140 and the frame 130 Accordingly, the reflective plate 154 is fixed to the lower surface 140a of the lower cover 140 to prevent the reflector 154 from being lifted from the lower surface 140a of the lower cover 140.

The support part 130c extends upward from the lower surface 140a of the lower cover 140, and an edge region of the glass diffusion plate 120 to which the liquid crystal panel 110 is attached is positioned on the upper surface thereof. At this time, the support part 130c is formed of a metal plate having a set width and height so that the upper surface supports the entire outer area of the glass diffusion plate 120. As described above, since the support part 130c is formed in a thin plate shape, the weight of the frame 130 can be minimized, and thus the liquid crystal display device 100 can be reduced in weight.

The support part 130c is reflected by the liquid crystal panel 110 emitted from the light source 150 and emitted to the side of the display device 100 to improve light efficiency. Since the frame 130 is made of a metal having a good reflectivity such as aluminum, light output from the light source 150 may be reflected to the support part 130c. However, in the present invention, in order to further improve the light efficiency, a reflective layer or a reflective film having a high reflectivity may be provided on the surface of the support part 130c facing the light source 150.

The support part 130c is formed in a curved surface having a set curvature, and the reason is as follows.

As shown in FIG. 5A, the support part 130c may be provided in a linear shape inclined at a certain angle θ with the lower surface 130a of the lower cover 140. In this configuration, light emitted from the light source 150 and emitted to the side of the liquid crystal display 100 reaches the support portion 130c of the frame 130. At this time, since the support part 130c of the frame 130 is formed of metal or a reflective member (reflective layer or reflective film) having good reflectivity is provided, the light emitted to the support part 130c of the frame 130 is reflected and It is supplied to the liquid crystal panel 110 of.

However, since the light reflected from the support member 130c disposed at a set angle is reflected in the vertical direction, the light emitted from the light source 150 is directly reflected in the outer area of the liquid crystal panel 110 located above the frame 130. In addition to being supplied, since light reflected from the support portion 130c of the frame 130 is supplied, the luminance is much higher than that of other regions, so that a bright line is generated on the screen of the display panel 110.

Moreover, since the density of light reflected and supplied to a specific area increases according to the angle of the support part 130c, it is difficult to achieve uniform luminance over the entire screen.

On the other hand, as shown in FIG. 5B, in the liquid crystal display device 100 according to the first embodiment of the present invention, since the support part 130c of the frame 130 is formed in a curved shape, the light source 150 The emitted light is not reflected from the support part 130c in a specific direction, but is reflected in a wide area and supplied to the liquid crystal panel 110. Moreover, since the area in which light is reflected can be adjusted by adjusting the curvature of the support part 130c, the reflected light is intensively supplied to the outer area of the liquid crystal panel 110 in a specific direction, and a bright line is generated on the screen in this area. It becomes possible to prevent it from doing.

In the drawing, although the support portion 130c of the frame 130 is formed in a specific curved shape, it may be formed in various shapes as long as it can reflect light incident from the light source 150 in various directions. For example, the support part 130c may be formed as an inclined surface having a step, but the angle of inclination may be varied to reflect input light in various directions.

The first coupling part 130a of the frame 130 is formed under the support part 130c and is coupled to the lower surface 140a of the lower cover 140, and the second coupling part 130b is a support part 130c. It is formed on the upper side and is coupled to the side surface 140b of the lower cover 140. At this time, the frame 130 and the lower cover 140 are coupled by screwing, but are not limited thereto and may be coupled by various methods such as adhesive or soldering.

Since the support part 130c not only supports the liquid crystal panel 110 and the glass diffusion plate 120, but also maintains a constant distance between the light source 150 and the liquid crystal panel 110, the distance between the support part 130c ( That is, the distance between the light source 150 and the liquid crystal panel 110) may be determined according to the intensity of light emitted from the light source 150, an emission angle, and a distance between the plurality of light sources 150.

The glass diffusion plate 120 is fixed by bonding the frame 130 to the upper surface by an adhesive member 134. The adhesive member 134 is provided between the edge region of the glass diffusion plate 120 and the upper surface of the support portion 130c of the frame 130 to fix the glass diffusion plate 120 so that when an external force acts, the glass diffusion plate 120 ) And the liquid crystal panel 110 not only prevents movement, but also absorbs and buffers an external force.

The adhesive member 134 may be an adhesive layer made of an adhesive. In this case, the adhesive is applied along the entire edge region of the glass diffusion plate 120 or applied to the upper surface of the support portion 130c of the frame 130, and then press-bonded to the glass diffusion plate 120 and the support portion 130c. By curing in the state, the glass diffusion plate 120 is attached to the frame 130. In this case, the adhesive member 134 may be formed with a width d1 set inward from the edge of the glass diffusion plate 120.

The adhesive member 134 may be made of a resin including a light blocking material. For example, the light blocking material may include black resin. As described above, as the light shielding material is included in the adhesive member 134, the light emitted from the light source 150 can be prevented from leaking along the edge region of the liquid crystal panel 110.

As described above, in the display device according to the first embodiment of the present invention, a liquid crystal panel is obtained by diffusing the light output from the light source 150 using the glass diffusion plate 120 without using a conventional film-type optical sheet. Supply to (110). Therefore, since deformation such as expansion of the diffusion plate 120 does not occur due to the high temperature heat generated from the light source 150, it is possible to prevent defects due to displacement of optical characteristics.

In addition, since the distance between the glass diffusion plate 120 and the light source 150 can be minimized without displacement of optical characteristics, the liquid crystal display device 100 can be made thinner.

Furthermore, in the present invention, the liquid crystal display device 100 is assembled by directly attaching the glass diffusion plate 120 bonded to the liquid crystal panel 110 to the frame 130 and combining the frame 130 with the lower cover 140. It is completed. Accordingly, since a separate structure conventionally used to fix the liquid crystal panel 110, such as a case top, is not required, the structure of the liquid crystal display device 100 can be simplified. In addition, since the conventional upper cover can reduce the bezel area generated by covering the edge area of the liquid crystal panel 110, the narrow bezel can be implemented.

6 is a cross-sectional view of a liquid crystal display 200 according to a second embodiment of the present invention. Since the liquid crystal display device 200 of this embodiment has a structure similar to that of the liquid crystal display device 100 of the first embodiment, description of the same structure will be omitted or simplified, and only other structures will be described in detail.

As shown in FIG. 6, the liquid crystal display 200 according to the second embodiment of the present invention includes a liquid crystal panel 210 and a backlight.

The liquid crystal panel 210 may include a TN mode liquid crystal panel, a VA mode liquid crystal panel, an IPS mode liquid crystal panel, and an FFS mode liquid crystal panel.

The backlight includes a light source 250, a light source substrate 152 on which the light source 250 is mounted, a reflective plate 254, and a glass diffusion plate 220.

The light source 250 may be an LED package, but is not limited thereto. The light source substrate 252 may be an LED substrate, and a plurality of light sources 250 are disposed on the lower cover 240 at regular intervals, and a plurality of light sources 250 are mounted on each light source substrate 252 along one direction.

The reflective plate 254 is disposed on the lower cover 240, reflects light emitted from the light source 250 in a downward direction, and supplies it to the liquid crystal panel 210.

The glass diffusion plate 220 is disposed above the light source 250 by a predetermined distance, so that uniform light is supplied from the light source 250 to the liquid crystal panel 210.

A transparent adhesive 214 is applied to the edge region of the upper surface of the glass diffuser plate 220 or the edge region of the lower surface of the liquid crystal panel 210, so that the glass diffuser plate 220 is attached to the liquid crystal panel 210.

The liquid crystal panel 210 and the backlight are supported by the frame 230 and the lower cover 240 is assembled by combining the frame 230 to manufacture a liquid crystal display.

The lower cover 240 is formed of metal and includes a lower surface 240a and a side surface 240b. The lower surface 240a and the side surface 240b form a storage space, and the reflection plate 254 and the light source substrate 252 on which the light source 250 is mounted are accommodated in the storage space.

The frame 230 is formed of metal to support the glass diffusion plate 220. The frame 230 includes a first coupling portion 230a coupled with the lower surface 240a of the lower cover 240, a second coupling portion 230b coupled with the side surface 240b of the lower cover 240, and glass diffusion. It includes a plate 220 and a support part 230c supporting the liquid crystal panel 210.

The support part 230c of the frame 230 extends upward from the lower surface 240a of the lower cover 240, and the edge region of the glass diffusion plate 220 to which the liquid crystal panel 210 is attached is located. do.

The support part 230c reflects light emitted from the light source 250 to the side in an upward direction to improve the efficiency of light supplied to the liquid crystal panel 210. The frame 230 is made of a metal having a good reflectivity such as aluminum, but in order to improve light reflection efficiency, a high reflectivity reflective layer or a high reflectivity reflective layer or a surface facing the light source 250 of the support portion 230c of the frame 230 A light reflective member such as a reflective film may be provided.

In addition, the support part 230c is formed in a curved surface having a set curvature, and reflects light incident from the light source 250 in various directions of the liquid crystal panel 210, thereby preventing light reflection to a specific area. Reflected light is intensively supplied to the outer area of the liquid crystal panel 210, so that the generation of bright lines on the screen in this area can be prevented.

The first coupling portion 230a of the frame 230 is coupled to the lower surface 240a of the lower cover 240, and the second coupling portion 130b of the frame 230 is a side surface 240b of the lower cover 140 ) And is combined. At this time, the frame 230 and the lower cover 240 are coupled by screwing, but are not limited thereto and may be coupled by various methods such as adhesive or soldering.

The glass diffusion plate 220 is attached to the frame 230 by an adhesive tape 234. The adhesive tape 234 is attached to the lower surface of the glass diffusion plate 220 and the side surface of the frame 230 to relatively fix the glass diffusion plate 220 and the frame 230,

7 is a view showing the adhesive tape 234.

As shown in FIG. 7, the adhesive tape 234 extends outward from the first adhesive region 234a attached to the lower surface of the glass diffusion plate 220 and the first adhesive region 234a. It is composed of a second bonding area 234b attached to a side surface, and a bending line 234c formed between the first bonding area 234a and the second bonding area 234b. At this time, since the length of the second bonding area 234b is smaller than the length of the side of the first bonding area 234a, the second bonding area 234b is spaced a certain distance from the edge area of the first bonding area 234a. It is located in the designated area.

The adhesive tape 234 is formed by applying an adhesive material on a transparent film made of a material such as polyethylene terephthalate (PET) or polycarbonates (PC), and the adhesive material is applied to the adhesive tape 234 in the first adhesive area 234a. ), and the adhesive material is applied to the lower surface of the adhesive tape 234 in the second adhesive region 234b.

Referring back to FIG. 6, the upper surface of the first adhesive region 234a of the adhesive tape 234 is attached to the lower surface of the glass diffusion plate 220. The second adhesive area 234b of the adhesive tape 234 is bent 90 degrees downward from the bending line 234c, and then the lower surface is attached to the side surface of the frame 230.

At this time, the second adhesive region 23b of the adhesive tape 234 is formed to have a length smaller than that of the first adhesive region 234a and is not formed at the edge of the first adhesive region 234a, so that the adhesive tape 234 is glass diffused. When attached to the plate 220 and the frame 230, the second bonding area 234b of the adhesive tape 234 is attached only to the side surface of the frame 230 except for the edge area.

The glass diffusion plate 220 (and the liquid crystal panel 210 to which the glass diffusion plate is attached) by the adhesive force of the adhesive tape 234 and the glass diffusion plate 22 and the adhesive force between the adhesive tape 234 and the frame 230 ) Is attached to the frame 230.

The first adhesive area 234a of the adhesive tape 234 may be formed to have substantially the same area as the lower surface of the glass diffusion plate 220, but is not limited thereto and may be formed in an area smaller than the area of the glass diffusion plate 220. Can be formed. In addition, the second adhesive region 234b of the adhesive tape 234 is formed to be smaller than the length of the side surface of the frame 230 so that the second adhesive region 234b of the adhesive tape 234 is It may be attached only to, and the second adhesive region 234b is formed larger than the length of the side surface of the frame 230 so that the second adhesive region 234b of the adhesive tape 234 is formed on the side and the lower cover of the frame 230. It may be attached to the side of 240. In other words, the first adhesive region 234a and the second adhesive region 234b of the adhesive tape 234 are not limited to a specific shape or length, but the glass diffusion plate 220 is stably fixed to the frame 230 If possible, it could be formed in a variety of shapes and lengths.

In the first embodiment of the present invention, the glass diffusion plate 120 is attached to and fixed to the frame 130 by the adhesive member 134, whereas in this embodiment, the glass diffusion plate 220 is fixed by the adhesive tape 234. Is fixed by attaching to the frame 230, the reason for this is as follows.

1 and 2, in the first embodiment of the present invention, after the adhesive member 134 is applied to the upper surface of the frame 130, the glass diffusion plate 120 is formed by the adhesive member 134. It is attached to the frame 130. Therefore, the upper surface of the frame 130 in contact with the lower surface of the glass diffusion plate 120 is a support area for supporting the glass diffusion plate 120 and an attachment area for attaching the glass diffusion plate 120 to the frame 130 to be.

Therefore, in the first embodiment, in order to stably fix the glass diffusion plate 120 and the frame 130, it is necessary to secure a set bonding force or more, so that the contact area between the glass diffusion plate 120 and the frame 130 is a set size. It should be more than that. In the first embodiment of the present invention, the contact area between the glass diffusion plate 120 and the frame 130, that is, the bonding area d1 between the glass diffusion plate 120 and the frame 130 is about 0.9 mm.

On the other hand, in the second embodiment of the present invention, bonding (or bonding) of the glass diffusion plate 220 and the frame 230 is performed by an adhesive tape 254, and the adhesive tape 254 is adhered to the frame 230 ) In terms of. Therefore, since the upper surface of the frame 230 in contact with the lower surface of the glass diffusion plate 220 is not a bonding region but a simple support region, the area of the frame 230 in contact with the lower surface of the glass diffusion plate 220 is glass diffusion. It only needs to be able to support the plate 220. According to the present invention, the contact area d2 between the glass diffusion plate 120 and the frame 130 in the second embodiment is 0.5 mm.

That is, compared to the liquid crystal display device 100 of the first embodiment, the contact area d2 between the glass diffusion plate 220 and the frame 230 in the liquid crystal display device 200 of the second embodiment can be reduced by about 0.4 mm. As the contact area d2 decreases, the following effects can be obtained.

In the present invention, the contact area between the glass diffusion plate 220 and the frame 230 is a blocking area that blocks light transmission. Therefore, since the contact area d2 of the liquid crystal display device 200 of the second embodiment is smaller than the contact area d1 of the first embodiment (d2 <d1), the liquid crystal display device of the second embodiment is The area of the blocking area is reduced compared to the liquid crystal display device. As a result, compared to the liquid crystal display device 100 of the first embodiment, the luminance in the corner region of the liquid crystal display device 200 of the second embodiment increases, and as a result, the aperture ratio of the liquid crystal display device 200 increases. .

8A and 8B are graphs showing luminance distribution in a liquid crystal display device according to the first and second embodiments of the present invention, respectively, and FIGS. 9A and 9B are views showing actual luminance on the screen.

As shown in FIG. 8A, in the liquid crystal display device 100 according to the first embodiment of the present invention, the luminance is about 1900-2100 cd/m ² in the center region, whereas the luminance is about 800-900 cd/m 2 in the edge region. It decreases to ^{m 2.} That is, the luminance of the edge area of the screen where the glass diffusion plate 120 and the frame 130 are in contact is reduced to 1/2 or less compared to the center area. Accordingly, as shown in Fig. 9A, a black line of a certain width appears in this area, and this area becomes an image non-display area in which no image is displayed.

As shown in FIG. 8B, in the liquid crystal display 200 according to the second embodiment of the present invention, the luminance is about 1900-2100 cd/m ² in the center region, whereas the luminance is about 1300-1400 cd/m 2 in the edge region. It decreases to ^{m 2.} That is, the luminance of the edge area of the screen where the glass diffusion plate 120 and the frame 130 contact is reduced to about 2/3 or less compared to the center area. Accordingly, as shown in FIG. 9B, the luminance of the edge area of the screen increases, and the width of the black line generated in this area decreases compared to the width of the black line of the first embodiment.

Accordingly, compared to the liquid crystal display device 100 according to the first embodiment, the liquid crystal display device 200 according to the second embodiment can achieve a uniform luminance over the entire screen area, as well as a high aperture ratio and improved luminance. You will be able to do it.

Referring back to FIG. 6, a step S is formed in the support part 230c of the frame 230. The step S changes the shape of the area where the light of the support part 230c is reflected, thereby changing the area to which the light emitted from the light source 150 reaches.

Compared to the liquid crystal display device 100 of the first embodiment, in the liquid crystal display device 200 of the second embodiment, the contact area d2 between the glass diffuser plate 220 and the frame 230 is reduced. Light must be supplied to the area. However, in the liquid crystal display device 100 of the first embodiment, since the support portion 130c of the frame 130 is formed in a curved shape protruding toward the light source 150, it enters the contact area, which is the edge area of the glass diffusion plate 120. The light is reflected by the support portion 130c and is supplied to another region, and the light reflected from the support portion 130c could not be supplied to the contact region.

However, as shown in FIG. 10, in the liquid crystal display 200 according to the second embodiment of the present invention, light incident to the contact area of the frame 230, that is, the edge area of the glass diffusion plate 220 is reflected. By forming a step (S) in the support portion 230c of the frame 230 in the region, the light emitted from the light source 250 is not reflected by the support portion 230c and is supplied to the contact region of the frame 230 as it is. . In addition, by changing the reflection direction of the support part 230c by the step S, the light reflected from the support part 230c is supplied to the contact area of the frame 230.

Accordingly, it is possible to supply uniform light over the entire area of the liquid crystal panel 210 by the step S, thereby improving the luminance in the edge area of the screen. An image with uniform luminance can be displayed.

11 is a perspective exploded view of a liquid crystal display according to a third embodiment of the present invention, and FIGS. 12A and 12B are cross-sectional views taken along lines A-A' and B-B' of FIG. 11. At this time, since the structure of this embodiment is similar to the structure of the second embodiment shown in FIG. 6, description of the same structure will be omitted or simplified, and only other structures will be described in detail.

11, 12A and 12B, in the liquid crystal display device 300 of this embodiment, a glass diffusion plate 320 is attached to the lower surface of the liquid crystal panel 310 by a transparent adhesive 314, and the The glass diffusion plate 320 is supported by, attached to, and fixed to the frame 330. In addition, a light source substrate 352 on which a plurality of light sources 350 such as an LED package is mounted is disposed on the lower surface 340a of the lower cover 340. The lower cover 340 and the frame 330 are coupled by a coupling means such as a screw, so that the liquid crystal display 300 is assembled.

The glass diffusion plate 320 is attached to and fixed to the frame 330 by an adhesive tape 334. The adhesive tape 334 may include a first adhesive region 334a and a second adhesive region 334b, as shown in FIG. 7. The first adhesive region 334a of the adhesive tape 334 is attached to the lower surface of the glass diffusion plate 320, and the second adhesive region 334b is bent from the first adhesive region 334a, It is attached to the side. In this case, the second adhesive region 334b may be attached to not only the side surface of the frame 330 but also the side surface of the lower cover 340.

A guide portion 335 is formed in a corner region of the frame 330. The guide portion 335 is formed to extend a predetermined distance from the edge region of the upper surface of the frame 330 to the side. In this case, the frame 330 may be formed in four corner regions of the frame 330, but is not limited thereto, and may be formed in one corner region or two or three corner regions.

In this embodiment, the installation of the guide portion 335 on the upper edge of the frame 330 is for easily assembling and fixing the glass diffusion plate 320 to the frame 330, and will be described in detail as follows. .

In the first embodiment of the present invention, the glass diffusion plate 120 is fixed by the adhesive member 134. Therefore, in the first embodiment, when the glass diffusion plate 120 and the frame 130 are aligned and then the glass diffusion plate 120 is placed on the upper surface of the frame 130, the glass diffusion plate 120 and the frame 130 Since this adhesive force is adhered by the strong adhesive member 134, the glass diffusion plate 120 does not flow.

On the other hand, in the second embodiment of the present invention, since the adhesive tape 234 is attached to the side of the frame 230 to fix the glass diffusion plate 220 to the frame 230, the glass diffusion plate 220 is In the state placed on the upper surface of the 230), adhesive force does not occur, so that the glass diffusion plate 220 can flow. Therefore, in the second embodiment of the present invention, assembly failure may occur due to the flow of the glass diffusion plate 220.

In this embodiment, by forming the guide portion 335 in the corner region of the frame 330 to prevent the flow of the glass diffusion plate (320). That is, when the glass diffusion plate 320 is placed on the frame 330, the edge of the glass diffusion plate 320 comes into contact with the guide part 335 and is fixed, so that no flow occurs in the glass diffusion plate 320. Will not be.

In addition, the guide portion 335 guides the glass diffusion plate 320 to be placed at a set position when placing the glass diffusion plate 320 on the upper surface of the frame 330. That is, in this embodiment, when the glass diffusion plate 320 is bonded to the frame 330, the glass diffusion plate 320 is seated at a set position by the guide part 335.

As described above, in this embodiment, since the guide portion 335 is provided to bond the glass diffusion plate 320 and the frame 330, it is possible to quickly assemble the liquid crystal display 300 without using an expensive ultra-precise alignment device. It is done.

That is, in the first and second embodiments, in order to bond the glass diffusion plate and the frame together, the glass diffusion plate must be placed at a predetermined location on the upper surface of the frame to prevent assembly failure of the liquid crystal display device. Accordingly, in order to manufacture the liquid crystal display device according to the first and second embodiments, a complicated alignment process using a high-precision alignment device is required.

On the other hand, in this embodiment, since the glass diffusion plate 320 is guided by the guide unit 335 and disposed at a set position on the upper surface of the frame 330, the glass diffusion plate 320 is easily carried out by a human hand (manual operation). ) Can be disposed at a set position on the upper surface of the frame 330, thereby simplifying the bonding process of the glass diffusion plate 320 and the frame 330.

In addition, in this embodiment, even when the alignment device is used, the glass diffusion plate 320 can be disposed at a set position on the upper surface of the frame 330 by using a low-cost alignment device instead of an expensive ultra-precision alignment device. It will be possible to reduce the cost.

The guide part 335 may be integrally formed with the frame 330. For example, the guide part 335 and the frame 330 may be made of metal. In this case, an impact absorbing layer 326 may be formed on the edge side of the glass diffusion plate 320. When the impact absorbing layer 326 is guided to the upper surface of the frame 330 by the guide portion 335, the impact absorbing layer 326 absorbs the impact caused by the collision between the glass and the metal. Prevent breakage.

The impact absorbing layer 326 may be formed over the entire area of the side surface of the glass diffusion plate 320, but may be formed only on the side surface of the glass diffusion plate 320 in contact with the guide portion 335. The impact absorbing layer 326 may be formed of a white resin having good elasticity, but is not limited thereto and may be formed of a colored resin such as black resin.

The guide part 335 may be manufactured separately from the frame 330 and attached to the upper surface of the corner of the frame 330 to be configured. That is, the guide part 335 may not be formed integrally with the frame 330 but may be formed separately and then attached to the upper surface of the corner of the frame 330. In this case, the guide part 335 may be formed of the same metal as the frame 335 or may be formed of a different metal.

When the guide part 335 is attached to the frame 335, the guide part 335 may be made of a material having a lower hardness than metal, such as plastic. In this case, since the plastic itself absorbs the impact caused by the collision between the glass and the metal, the impact absorbing layer 326 disposed on the side of the glass diffusion plate 320 may be removed.

As described above, in the liquid crystal display device 300 of this embodiment, by forming the guide portion 335 on the frame 330, the glass diffusion plate 320 can be easily disposed on the upper surface of the frame 330. , A quick liquid crystal display device 300 can be assembled.

13A-13E are diagrams illustrating a method of assembling a liquid crystal display device 300 according to a third exemplary embodiment of the present invention.

First, as shown in FIG. 13A, the first adhesive region 334a of the adhesive tape 334 is attached to the lower surface of the glass diffusion plate 320. Subsequently, after the reflective plate 354 and the light source substrate 352 on which the plurality of light sources 350 are mounted are disposed on the lower cover 340, the lower cover 340 is coupled to the frame 330 by screws or the like.

Subsequently, as shown in FIG. 13B, the glass diffusion plate 320 to which the adhesive tape 334 is attached is mounted on the structure to which the frame 330 and the lower cover 340 are combined.

As shown in FIG. 13C, the glass diffusion plate 320 is guided by a guide portion 335 formed on the upper surface of the corner of the frame 330 and is seated at a set position on the upper surface of the frame 330. At this time, the impact absorbing layer 326 is formed on the side of the glass diffusion plate 320 to absorb the impact between the glass diffusion plate 320 and the guide unit 335.

The second bonding area 334b of the adhesive tape 334 adhered to the lower surface of the glass diffusion plate 320 is disposed to extend outside the glass diffusion plate 320 and the frame 330.

Thereafter, as shown in FIG. 13D, the second adhesive area 334b of the adhesive tape 334 is folded at a bending line and attached to the side surface of the frame 330. In this case, the second adhesive area 334b of the adhesive tape 334 may be attached to both sides of the frame 330 and the lower cover 340.

Subsequently, as shown in FIG. 13E, after disposing the liquid crystal panel 310 on the upper portion of the glass diffusion plate 320, the The liquid crystal display device 300 is completed by attaching the liquid crystal panel 310 to the glass diffusion plate 320.

14 is a cross-sectional view showing the structure of a liquid crystal display device 400 according to a fourth embodiment of the present invention. At this time, since the liquid crystal display device 400 of this embodiment is similar in structure to the liquid crystal display devices 200 and 300 of the second and third embodiments, the description of the same structure is omitted or simplified, and only other structures are detailed. Explain.

14, in the liquid crystal display device 400 of this embodiment, the first adhesive region 434a of the adhesive tape 434 having adhesive layers formed on both sides is between the liquid crystal panel 410 and the glass diffusion plate 420 The liquid crystal panel 410 and the glass diffusion plate 420 are bonded to each other by the adhesive tape 434, and the second adhesive area 434b of the adhesive tape 434 is bent downward to the frame 430 (and It is attached to the side of the lower cover (440).

In other words, in the liquid crystal display device 400 of this embodiment, not only the glass diffusion plate 420 and the frame 430 are fixed by the adhesive tape 434, but also the liquid crystal panel 410 and the glass diffusion plate 420 are bonded together. Therefore, a separate adhesive member for bonding the liquid crystal panel 410 and the glass diffusion plate 420 is not used. Accordingly, it is possible to reduce the manufacturing cost of the liquid crystal display device 400 and to simplify the manufacturing process.

At this time, the adhesive tape 434 is disposed between the liquid crystal panel 410 and the glass diffusion plate 420 so that the light diffused from the glass diffusion plate 420 is transferred to the liquid crystal panel 410 through the adhesive tape 434. Since it is supplied directly, the transparent film, which is the substrate of the adhesive tape 434, must transmit light as it is without changing its optical properties. Therefore, it is preferable to use PC (polycarbonates) as the base material of the adhesive tape 434 of this embodiment, but any material may be used as long as the characteristics of light are not changed.

As described above, in the present invention, since the glass diffuser plate is used instead of the conventional optical sheet to change the characteristics of the light supplied to the liquid crystal panel, it is possible to prevent the deterioration of the image quality by preventing the change in optical characteristics due to high temperature. In addition, in the present invention, since the contact area between the glass diffusion plate and the frame can be minimized by attaching the adhesive tape to the side of the frame (and the lower cover), the aperture ratio and brightness of the liquid crystal display can be improved.

Although many items are specifically described in the above description, this should be interpreted as an illustration of a preferred embodiment rather than limiting the scope of the invention. Therefore, the invention should not be determined by the described embodiments, but should be defined by the claims and equivalents to the claims.

110,210,310,410: liquid crystal panel 114,214,314: adhesive
120,220,320,420: glass diffuser 130,230,330,430: frame
14,240,340,440: lower cover 234,334,434: adhesive tape
326: shock absorbing layer 335,435: guide part

Claims (18)

Display panel;
A glass diffusion plate disposed under the display panel;
A frame supporting the glass diffusion plate;
A lower cover coupled to the frame; And
A display device comprising an adhesive tape attached to a lower surface or an upper surface of the glass diffusion plate and a side surface of the frame to fix the glass diffusion plate to the frame.
The method of claim 1,
A plurality of light source substrates accommodated in the lower cover;
A plurality of light sources mounted on the light source substrate; And
The display device further comprises a reflector accommodated in the lower cover.
The method of claim 2, wherein the frame,
A coupling portion coupled to the lower cover; And
A display device including a support portion supporting the glass diffusion plate.
The display device of claim 3, wherein the coupling portion of the frame is disposed above the reflecting plate to apply pressure to the reflecting plate.
4. The display device of claim 3, wherein a reflective member is provided on a surface of the support unit that faces the light source.
The display device of claim 3, wherein the support portion of the frame has a curved surface.
The display device of claim 6, wherein a step is formed in the support portion of the frame.
The method of claim 1, wherein the adhesive tape,
A first adhesive region adhered to a lower surface or an upper surface of the glass diffusion plate;
A second adhesive region adhered to a side surface of the frame; And
A display device including a bent line formed between the first adhesive region and the second adhesive region to bend the second adhesive region. The display device of claim 8, wherein the second adhesive area of the adhesive tape extends to a side surface of the lower cover and is attached to the frame and side surfaces of the lower cover.
The display of claim 8, wherein the first adhesive area of the adhesive tape is adhered to the lower surface of the glass diffusion plate, and an adhesive member is provided between the glass diffusion plate and the display panel to bond the glass diffusion plate and the display panel together. Device.
The display device of claim 8, wherein the first adhesive region of the adhesive tape is attached to the upper surface of the glass diffusion plate and the display panel, and bonds the glass diffusion plate and the display panel.
The display device of claim 1, further comprising a guide portion formed in a corner region of the frame to guide the glass diffusion plate.
The display device of claim 12, wherein the guide part is integrally formed with the frame.
The display device of claim 12, wherein the guide portion is formed separately from the frame and is attached to the frame.
The display device of claim 12, further comprising a shock absorbing unit formed on a side surface of the glass diffusion plate to absorb an impact between the glass diffusion plate and the guide unit.
The display device of claim 15, wherein the impact absorbing portion is formed on an entire side surface of the glass diffusion plate or on a side surface corresponding to the guide portion.
16. The display device of claim 15, wherein the shock absorber is made of a resin having elasticity.
The method of claim 1, wherein the glass diffusion plate,
Base film;
A diffusion layer formed on the first surface of the base film to which light is incident; And
A display device comprising a luminance enhancing layer formed on a second surface of the base film from which light is emitted.

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