KR20160082879A - Back light unit and method of manufacturing the same, and liquid crystal display device and method of manufacturing the same using the back light unit - Google Patents

Abstract

The present invention relates to a liquid crystal display device. Especially, the present invention is to provide a backlight unit including a guide panel having a push hole where a push bar is inserted and a manufacturing method thereof, and a liquid crystal display device using the same and a manufacturing method thereof. The backlight unit comprises: a light guide panel; and the guide panel of which one side has a light source groove having a light source mounted in a flexible printed circuit board connected to a liquid crystal panel inserted therein, and the other side has the push hole having the push bar pushing the light guide panel toward the light source groove inserted therein, having the light guide unit arranged therein, and supporting the liquid crystal panel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit, a method of manufacturing the same, a liquid crystal display using the same and a method of manufacturing the same. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit, and more particularly, to a backlight unit of a component inside type, in which a light source is mounted on a flexible printed circuit board connected to a panel, a manufacturing method thereof, a liquid crystal display device using the same, .

Flat panel displays (FPDs) are used in various types of electronic products including mobile phones, tablet PCs, and notebook computers. The flat panel display device includes a liquid crystal display device (LCD), a plasma display panel (PDP), and an organic light emitting display device (OLED) Device (EPD: electrophoretic display) is also widely used.

Of the flat panel display devices, the liquid crystal display device is most widely commercialized at present due to the advantages of mass production technology, ease of driving means, and high image quality.

2 is a view illustrating a method of mounting a light guide plate on a guide panel in a conventional liquid crystal display device, and FIG. 3 is a cross-sectional view of a light guide plate and a light guide plate in a conventional liquid crystal display device. And Fig.

1, the conventional liquid crystal display device includes a reflection plate 11, a light guide plate 12, an optical film unit 13, a guide panel 14, a liquid crystal panel 16, a light shielding tape 15, And a light source unit 20.

The light source unit 20 includes a flexible printed circuit board (FPCB) 21, a light source 22, and a component 23.

The liquid crystal panel 16 is attached to the light source unit 20, the light guide plate 12 and the optical film unit 13 by the shielding tape 15, The light source 22 and the component 23 are attached to the upper surface of the guide panel 14 using the shielding tape 15. The light source 22 and the component 23 are attached to the guide panel 14 through the lower end of the guide panel 14. [ And then fixed by the fixing tape, thereby completing the liquid crystal display device.

As the product simplification and the reliability demand due to the external impact increase, the demand for a component inside type as shown in Fig. 1 is increasing.

In the case of the liquid crystal display of the in-component type, the light source 23 is mounted on the flexible printed circuit board 21, and then inserted into the guide panel 14 and fixed.

2, the light guide plate 12 is disposed on the guide panel 14 by manual operation in the component inside type liquid crystal display device.

2 (a), the guide protrusion 12 formed on the guide panel 14 is inserted into the guide groove 14a formed in the guide panel 14, So that the light guide plate 12 can be fixed to the guide panel 14. In this case, the width C of the guide groove 14a is formed to be slightly larger than the width of the guide projection 12, as shown in FIG. 2 (b).

The width C of the guide groove 14a is formed to be slightly larger than the width of the guide projection 12 and the light guide plate 12 is arranged on the guide panel 14 by manual operation Therefore, the position of the guide protrusion 12 in the guide groove 14a can be changed. Accordingly, the gap (gap) between the light guide plate 12 and the light source 22 varies from one liquid crystal display device to another. Accordingly, the intensity of the light introduced into the light guide plate 12 may be different for each liquid crystal display device, and accordingly, the brightness of the light emitted from the light guide plate 12 to the panel 16 differs for each liquid crystal display device.

2 (b), when the light guide plate 12 is disposed in close contact with the rear surface direction B of the guide groove 14a, the light guide plate 12, which is in close contact with the light source 22, The light incident surface 12b of the guide panel 14 is spaced from the direction of the light source groove 14b in which the light source 22 is disposed. 3 (a), the interval X between the light-entering surface 12b of the guide panel 14 and the light source 22 is widened.

2 (b), when the light guide plate 12 is disposed so as to be in close contact with the guide groove 14a in the front direction A, the light guide plate 12, which is in close contact with the light source 22, The light surface 12b is closely attached in the direction of the light source groove 14b in which the light source 22 of the guide panel 14 is disposed. 3 (b), when the interval X 'between the light-incident surface 12b of the guide panel 14 and the light source 22 is smaller than the interval X' shown in FIG. 3 (a) (X).

After the panel 16 is disposed on the backlight unit including the light guide plate 12, the reflection plate 11 and the guide panel 14, the flexible printed circuit board 21 is manually And the arranged light source 22 is disposed in the light source groove 14b. In this case, the position of the light source 22 may be different in the light source groove 14b depending on the operator.

The gap (gap) between the light source 22 and the light incidence surface 12b may be different for each liquid crystal display device due to the above-described causes, so that a luminance deviation may occur between the liquid crystal display devices have. For example, when the distance between the light source 22 and the light incidence surface 12b is 0.3 mm, a luminance drop of 20% occurs.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above problems, and it is an object of the present invention to provide a backlight unit including a guide panel having a push hole into which a push bar is inserted, a method of manufacturing the same, and a liquid crystal display using the same and a method of manufacturing the same. It is a technical task.

According to an aspect of the present invention, there is provided a backlight unit comprising: a light guide plate; And a push-hole for inserting a pushbutton for pushing the light guide plate toward the light source groove is provided on the other side of the light guide plate, And a guide panel for supporting the liquid crystal panel.

According to another aspect of the present invention, there is provided a method of manufacturing a backlight unit, the method comprising: disposing a light guide plate on a top of the reflector after arranging a reflector on a guide panel; Disposing an optical film part on an upper end of the light guide plate; Attaching a light shielding tape to an upper end surface of the guide panel and an upper end surface of the optical film portion; A pushbutton provided on the other side of the guide panel opposite to the one side provided with the light source groove into which the light source mounted on the flexible printed circuit board connected to the liquid crystal panel is inserted, ; And attaching a fixing tape to the lower end surface of the guide panel and the lower end surface of the light guide plate to fix the guide panel and the light guide plate.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel having a flexible printed circuit board on which a light source is mounted; And a backlight unit which supports the liquid crystal panel and in which the light source is disposed, the backlight unit including: a light guide plate; And a push-hole for inserting a push bar for pushing the light guide plate in the direction of the light source groove is provided on the other side of the light guide groove, and the light guide plate is disposed, Panel.

According to another aspect of the present invention, there is provided a method of manufacturing a liquid crystal display device, the method including disposing a light guide plate on a guide panel, positioning the light guide plate in a light source groove direction in which a light source mounted on a flexible printed circuit board connected to the liquid crystal panel is inserted Fixing the lower end surface of the guide panel and the lower end surface of the light guide plate with a fixing tape after pushing; And disposing the liquid crystal panel in the guide panel, and inserting and fixing the light source in the light source groove.

According to the present invention, the luminance loss of the liquid crystal display device can be minimized, and the luminance deviation between the liquid crystal display devices can be minimized.

1 is an exemplary view showing a cross section of a conventional liquid crystal display device.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device.
3 is an exemplary view showing a gap between a light guide plate and a light source in a conventional liquid crystal display device.
4 is an exploded perspective view showing a liquid crystal display device according to the present invention.
5A to 5G are views showing an example of a method of manufacturing a liquid crystal display device according to the present invention.
6 is an exemplary view schematically showing a bottom surface of a backlight unit according to the present invention.
7 is a schematic view showing another example of a bottom surface of a backlight unit according to the present invention.

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

4 is an exploded perspective view showing a liquid crystal display device according to the present invention.

4, the liquid crystal display device according to the present invention includes a liquid crystal panel 150 having a flexible printed circuit board 181 on which a light source 182 is mounted, And a cover bottom 110 for supporting the backlight unit 200 and the backlight unit 200 on which the light source 182 is disposed.

The backlight unit 200 includes a light guide plate 120 and a light source groove into which the light source 182 is inserted at one side and a light source groove in which a push bar for pushing the light guide plate 120 toward the light source groove is inserted. And a guide panel 140 provided with a hole 141 and disposed with the light guide plate 120 and supporting the liquid crystal panel 150. In addition, the backlight unit 200 includes a light shielding tape 170 attached to a lower end surface of the liquid crystal panel 150, an optical film unit 130 composed of a plurality of optical sheets, A reflection plate 160 and a fixing tape 190.

First, the liquid crystal panel 150 includes a liquid crystal injected between an array substrate (TFT substrate) and a color filter substrate (CF substrate), and outputs an image by controlling a transmission amount of light emitted from the light source unit.

A polarizing film may be attached to the upper and lower surfaces of the liquid crystal panel 150. The polarizing film is attached to at least one of the upper surface and the lower surface of the liquid crystal panel 150 and passes only components in a specific direction among components of light transmitted through the light guide plate 120 Function.

A flexible printed circuit board (FPCB) 181 on which the light source 182 and the components 183 for driving the light source are mounted is mounted on the liquid crystal panel 150, Respectively.

The light source 182, the flexible printed circuit board 181 and the component 183 constitute a light source unit 180.

The component 183 may be various electronic components 183 for driving the light source.

In addition, the component 183 may be various electronic components 183 that function to drive the liquid crystal panel 150.

As the light source 182, various kinds of lamps may be used, and in particular, a light emitting diode (LED) may be used.

4, the light shielding tape 170 is formed in the shape of a rectangular frame and has a lower end surface of an outer frame portion (hereinafter, simply referred to as a "bezel") of the liquid crystal panel 150, And is attached to the upper surface of the panel 140. The light shielding tape 170 may be formed in various shapes according to the shape of the liquid crystal panel 150.

The light shielding tape 170 prevents the light transmitted from the light source unit 180 from flowing out between the guide panel 140 and the liquid crystal panel 150 and also prevents the light from flowing out through the bezel prevent.

Third, the guide panel 140 is formed in a rectangular frame shape so that the bezel of the liquid crystal panel 150 is disposed.

However, the guide panel 140 may be formed in various shapes depending on the shape of the liquid crystal panel 150.

The light shielding tape 170 is attached to the upper surface of the guide panel 140.

The guide panel 140 functions to guide the light source unit 180.

One side of the guide panel 140 is provided with a light source groove into which the light source 182 mounted on the flexible printed circuit board 181 connected to the liquid crystal panel 150 is inserted.

4, a push hole 141 into which a push bar for pushing the light guide plate 120 toward the light source groove is inserted is provided on the other side of the guide panel 140. As shown in FIG.

The number of the push holes 141 may be at least one or more.

The push hole 141 may be formed in various shapes such as a circle, an ellipse, a triangle, a rectangle, a pentagon, a hexagon, a star, a cross,

The light guiding plate 120 is disposed on the guide panel 140.

The guide panel 140 supports the liquid crystal panel 150.

Fourth, the optical film portion 130 includes a plurality of optical sheets.

The optical film unit 130 functions to diffuse light that has passed through the light guide plate 120 or to cause light that has passed through the light guide plate 120 to be incident on the liquid crystal panel 150 in a vertical direction.

For this purpose, the optical film unit 130 may include a diffuser sheet for diffusing light, a prism sheet for vertically converting light into the liquid crystal panel 150, and the like. .

Fifth, the light guide plate 120 irradiates the light outputted from the light source unit 180 toward the liquid crystal panel 150.

The light guide panel (LGP) 120 is formed of a transparent material and is formed into a plate shape. The light guide plate 120 scatters and reflects light emitted from the light source module 180 and transmits the light toward the liquid crystal panel 150 disposed at the upper end of the light guide plate.

The light guide plate may be formed of a plastic material such as PMMA (Polymethylmethacrylate) or a resin material.

Sixth, the reflection plate 160 is disposed on the bottom surface of the light guide plate.

The reflection plate 160 is disposed on the lower end surface of the light guide plate 120 and is disposed at the upper end of the light guide plate 120 so as to output light emitted from the light source module 180 and proceeding toward the lower end of the light guide plate 120. To the direction of the liquid crystal panel 150.

For example, light emitted from the light source module 180 and introduced into the light guide plate 120 is refracted by a pattern or the like formed on the light guide plate and is reflected toward the liquid crystal panel 150.

However, there may be a light that is not reflected in the direction of the liquid crystal panel 150 but flows out to the outside through the lower end surface of the light guide plate 120.

The reflection plate 160 reflects light emitted to the outside through the lower end surface of the light guide plate 120 toward the light guide plate 120 and guides the light toward the liquid crystal panel 150.

Seventh, the cover bottom 110 supports the backlight unit 200, specifically, the guide panel 140.

Therefore, the cover bottom 110 functions not only to receive the guide panel 140, but also to accommodate the components as described above.

In this case, the cover bottom 110 may be coupled to a case top covering the bezel of the liquid crystal panel 150 to receive the components, but the components may be accommodated independently of the case tops .

Further, in the liquid crystal display device according to the present invention, the cover bottom 110 may be omitted.

Eighth, the fixing tape 190 is attached to the lower end surface of the guide panel 140 and the lower end surface of the light guide plate 120 to fix the guide panel 140 and the light guide plate 120 at a predetermined position .

Accordingly, the light guide plate 120 may be fixed to the guide panel 140 in a state in which the light guide plate 120 is in close contact with the light source groove 142.

In addition, the fixing tape 190 may fix the flexible printed circuit board 181 to the guide panel 140.

For this purpose, the fixing tape 190 may be a double-sided tape.

5A to 5G are views showing an exemplary method of manufacturing a liquid crystal display device according to the present invention.

The method for manufacturing a liquid crystal display device according to the present invention is characterized in that the light guide plate 120 is disposed on the guide panel 140 and the light guide plate 120 is disposed on the flexible printed circuit board 181 connected to the liquid crystal panel 150, The lower end surface of the guide panel 140 and the lower end surface of the light guide plate 120 are fixed with the fixing tape 190 after the light source 182 mounted on the guide panel 140 is inserted in the direction of the light source groove 142, And disposing the liquid crystal panel 150 on the guide panel 140 and inserting and fixing the light source 182 into the light source groove 142.

5A, the flexible printed circuit board 181 on which the light source 182 and the component 183 are mounted is attached to the liquid crystal panel 150. FIG.

The flexible printed circuit board 181 is attached to a non-display area (bezel) of the liquid crystal panel 150.

The flexible printed circuit board 181 may be attached to the TFT substrate, particularly the TFT substrate and the CF substrates constituting the liquid crystal panel 150.

5B, after the reflection plate 160 is disposed on the guide panel 140, the light guide plate 120 is disposed on an upper end of the reflection plate 160. Referring to FIG.

5B, the light source 182 mounted on the flexible printed circuit board 181 connected to the liquid crystal panel 150 is inserted into the guide panel 140, for example, A groove 142 is provided.

The push hole 141 for pushing the light guide plate 120 in the direction of the light source groove 142 is provided at the other side of the guide panel 140, for example, do.

Next, referring to FIG. 5C, the optical film unit 130 is disposed on an upper end of the light guide plate 120.

5D, a light shielding tape is attached to the upper end surface of the guide panel 140 and the upper end surface of the optical film part 130. As shown in FIG.

5E, one side of the guide panel 140 where the light source groove 142 in which the light source 182 mounted on the flexible printed circuit board 181 connected to the liquid crystal panel is inserted The push bar 300 is inserted into the push groove 141 provided on the other side facing the light guide plate 120 so that the light guide plate 120 is moved in the direction of the light source groove 142.

The light guide plate 120 may be in close contact with the light source groove 142 and the light source 182 disposed in the light source groove 142 and the light incoming surface 121 of the light guide plate 120 may be in close contact with each other. .

Most of the light output from the light source 182 may be introduced into the light guide plate 120 through the light incidence surface 121 when the light incidence surface 121 and the light source 182 are in close contact with each other.

When a large amount of light enters the light guide plate 120, the amount of light irradiated to the liquid crystal panel 150 increases.

Therefore, the luminance loss of the liquid crystal display device can be minimized.

When the light incidence surface 121 and the light source 182 are in close contact with each other, errors in the intervals between the light incidence surface 121 and the light source 182 in the different liquid crystal display devices are reduced.

Accordingly, the luminance deviation between the liquid crystal display devices can be minimized.

5F, the fixing tape 190 is attached to the lower end surface of the guide panel 140 and the lower end surface of the light guide plate 120 so that the guide panel 140 and the light guide plate 120 .

5E, the light incident surface 121 of the light guide plate 120 is in close contact with the light source groove 142 and the light guide plate 120 is in contact with the light source groove 142. In this case, The fixing tape 190 is fixed to the lower end surface of the guide panel 140 and the lower end surface of the light guide plate 120. [

Accordingly, the light guide plate 120 can be fixed to the guide panel 140 in a state in which the light guide plate 120 is in close contact with the light source groove 142.

5G, by attaching the flexible printed circuit board 181 to the fixing tape 190, the flexible printed circuit board 181 is attached to the lower end surface of the guide panel 140 And may be fixed to the lower end surface of the light guide plate 120.

For example, the liquid crystal panel 150 as shown in FIG. 5A is disposed at an upper end of the guide panel 140 that has undergone the process shown in FIG. 5F.

In this case, the liquid crystal panel 150 is attached to the light shielding tape 170. Accordingly, the liquid crystal panel 150 may be fixed to the guide panel 140.

The flexible printed circuit board 181 attached to the liquid crystal panel 150 is bent in a direction from the upper surface of the guide panel 140 toward the lower surface.

The light source 182 mounted on the flexible printed circuit board 181 is inserted into the light source groove 142 in a state in which the flexible printed circuit board 181 is bent in the direction of the bottom surface of the guide panel 140. [ do.

In this case, the component 183 mounted on the flexible printed circuit board 181 is also inserted into the groove formed in the guide panel 140.

The flexible printed circuit board 181 is fixed to the fixing tape 190 so that the flexible printed circuit board 181 can be fixed to the guide panel 140. [

The fixing tape 190 has a function of fixing the guide panel 140 and the light guide plate 120 and a function of fixing the flexible printed circuit board 181 to the guide panel 140.

For this purpose, the fixing tape 190 may be a double-sided tape.

Through the above-described processes, the liquid crystal display device according to the present invention can be manufactured.

FIG. 6 is a schematic view illustrating a bottom surface of the backlight unit according to the present invention. FIG. 6 also shows the fixing tape 190 attached to the bottom surface of the guide panel 140. 7 is a schematic view illustrating a lower end surface of the backlight unit according to the present invention. In particular, FIG. 7 shows a lower end surface of the guide panel 140 to which the fixing tape 190 is attached. In the guide panel 140 shown in Figs. 6 and 7, the groove into which the component 183 is inserted is not shown.

6 and 7 illustrate a process of attaching the fixing tape 190 to the lower end surface of the guide panel 140 and the lower end surface of the light guide plate 120, Process.

As described above, after the reflection plate 160 and the light guide plate 120 are disposed on the guide panel 140, the light guide plate 120 is guided by the push bar 300 to the light source groove 142 ) Direction.

In this case, the reflection plate 160 may be fixed to the guide panel 140 through the adhesive tape 161.

6, in a state in which the light entrance surface 121 of the light guide plate 120 is in close contact with the light source groove 142, the fixing tape 190 is fixed to the lower end of the guide panel 140 And to be attached to the lower end surface of the light guide plate 120.

7, the fixing tape 190 is attached to the lower end surface of the guide panel 140 and the lower end surface of the light guide plate 120. As shown in FIG.

Accordingly, the light guide plate 120 can be fixed to the guide panel 140 in a state in which the light guide plate 120 is in close contact with the light source groove 142.

The features of the present invention described above can be summarized as follows.

The guide bar 140 is provided with the push bar 200 for pushing the light guide plate 120 in the direction of the light source groove 184 in which the light source 182 of the guide panel 140 is disposed, A push hole 141 is provided.

Thereby, the light loss can be minimized, and the luminance deviation between the respective liquid crystal display devices can be minimized.

The light guide plate 120 may be inserted into the light source groove (not shown) provided in the guide panel 140 by using the push bar 200 and the push hole 141 when the backlight unit is assembled, 184, the interval between the light source 182 and the light guide plate 120 can be minimized, and the luminance deviation between the liquid crystal display devices can be reduced.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

110: cover bottom 120: light guide plate
130: optical film part 140: guide panel
150: liquid crystal panel 160: reflector
170: Shading tape 180: Light source part
141: Push hole 300: Push bar
190: Fixed tape

Claims (8)

A light guide plate; And
A light source groove to which a light source mounted on a flexible printed circuit board connected to the liquid crystal panel is inserted and a push hole into which the push bar for pushing the light guide plate toward the light source groove is inserted is provided on the other side, And a guide panel for supporting the liquid crystal panel. The method according to claim 1,
Wherein a lower end surface of the guide panel and a lower end surface of the light guide plate are fixed by a fixing tape. Disposing a light guide plate on the upper side of the reflector after arranging the reflector on the guide panel;
Disposing an optical film part on an upper end of the light guide plate;
Attaching a light shielding tape to an upper end surface of the guide panel and an upper end surface of the optical film portion;
A pushbutton provided on the other side of the guide panel opposite to the one side provided with the light source groove into which the light source mounted on the flexible printed circuit board connected to the liquid crystal panel is inserted, ; And
And attaching a fixing tape to the lower end surface of the guide panel and the lower end surface of the light guide plate to fix the guide panel and the light guide plate. A liquid crystal panel having a flexible printed circuit board on which a light source is mounted; And
And a backlight unit which supports the liquid crystal panel and in which the light source is disposed,
The backlight unit includes:
A light guide plate; And
A light guide groove for receiving the light source is provided on one side and a push hole for inserting a push bar for pushing the light guide plate toward the light source groove direction is provided on the other side, And the liquid crystal display device. 5. The method of claim 4,
Wherein a lower end surface of the guide panel and a lower end surface of the light guide plate are fixed by a fixing tape. The light guide plate is disposed on the guide panel and the light guide plate is pushed in the direction of the light source groove in which the light source mounted on the flexible printed circuit board connected to the liquid crystal panel is inserted and the lower end face of the guide panel and the lower end face of the light guide plate are fixed, ; And
Disposing the liquid crystal panel on the guide panel, and inserting the light source into the light source groove to fix the liquid crystal panel. The method according to claim 6,
The light guide plate is disposed on the guide panel and the light guide plate is pushed in the direction of the light source groove in which the light source mounted on the flexible printed circuit board connected to the liquid crystal panel is inserted and the lower end face of the guide panel and the lower end face of the light guide plate are fixed, , ≪ / RTI >
Disposing a light guide plate on the upper side of the reflector after arranging the reflector on the guide panel;
Disposing an optical film part on an upper end of the light guide plate;
Attaching a light shielding tape to an upper end surface of the guide panel and an upper end surface of the optical film portion;
A pushbutton provided on the other side of the guide panel opposite to the one side provided with the light source groove into which the light source mounted on the flexible printed circuit board connected to the liquid crystal panel is inserted, ; And
And attaching a fixing tape to the lower end surface of the guide panel and the lower end surface of the light guide plate to fix the guide panel and the light guide plate. 8. The method of claim 7,
The step of inserting and fixing the light source into the light source groove comprises:
A liquid crystal display device manufacturing method of inserting the light source into the light source groove and then attaching the flexible printed circuit board to the fixing tape to fix the flexible printed circuit board to the lower end face of the guide panel and the lower end face of the light guide plate Way.

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