KR102000989B1 - Liquid crystal display device - Google Patents

Abstract

In the liquid crystal display of the present invention, an insert mold structure is applied to a press guide panel to improve a flexural characteristic, thereby realizing a narrow bezel with sufficient rigidity. A liquid crystal panel for outputting an image, for reducing material costs and improving workability by deleting an additional configuration such as a silicon pad and a guide piece for the LCD panel; A backlight unit installed on a rear surface of the liquid crystal panel and emitting light over the entire surface of the liquid crystal panel; A cover bottom and a press guide panel for receiving and fixing the liquid crystal panel and the backlight unit; And an insert mold which is manufactured through a mold on the upper front surface of the press guide panel and seats and guides the liquid crystal panel.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device in which an insert mold is applied to a press guide panel to place a liquid crystal panel thereon.

2. Description of the Related Art In general, a liquid crystal display device is a display device which can display a desired image by individually supplying data signals according to image information to pixels arranged in a matrix form and adjusting light transmittance of the pixels.

Accordingly, a liquid crystal display device includes a liquid crystal panel in which pixels are arranged in a matrix form, and a driver for driving the pixels.

The liquid crystal panel is composed of a color filter substrate, an array substrate, and a liquid crystal layer formed in a cell gap between the color filter substrate and the array substrate so as to face each other to maintain a uniform cell gap. do.

At this time, a common electrode and a pixel electrode are formed on the liquid crystal panel in which the color filter substrate and the array substrate are bonded together to apply an electric field to the liquid crystal layer.

Therefore, when the voltage of the data signal applied to the pixel electrode is controlled while the voltage is applied to the common electrode, the liquid crystal of the liquid crystal layer is rotated by dielectric anisotropy according to the electric field between the common electrode and the pixel electrode to transmit or block the light by each pixel is to display a text or image.

In this case, since the liquid crystal display device is a light-receiving device that can not emit light itself but displays an image by adjusting the transmittance of light coming from the outside, a separate device for irradiating light to the liquid crystal panel, that is, a backlight unit Is required.

With reference to the drawings will be described in detail a typical liquid crystal display device.

1 is a perspective view schematically showing a structure of a general liquid crystal display device.

FIG. 2 is a perspective view showing an enlarged portion A of the general liquid crystal display device shown in FIG. 1. FIG. 3 is a perspective view showing an enlarged view of a portion B in the general liquid crystal display device shown in FIG. to be.

Referring to the drawings, a typical liquid crystal display device includes a liquid crystal panel 10 in which pixels are arranged in a matrix form to output an image, a driving unit (not shown) for driving the pixels, And a guide panel 30 for receiving and fixing a backlight unit that emits light over the entire surface of the liquid crystal panel 10.

Although not shown, the liquid crystal panel 10 includes a color filter substrate, an array substrate, and a liquid crystal layer formed in a cell gap between the color filter substrate and the array substrate so as to maintain a uniform cell gap so as to face each other.

A common electrode and a pixel electrode are formed on the liquid crystal panel 10 to which the color filter substrate and the array substrate are attached to each other. An electric field is applied to the liquid crystal layer. Data applied to the pixel electrode When the voltage of the signal is controlled, the liquid crystal of the liquid crystal layer rotates by dielectric anisotropy according to an electric field between the common electrode and the pixel electrode to transmit or block light for each pixel to display characters or images.

In order to control the voltage of the data signal applied to the pixel electrode on a pixel-by-pixel basis, a switching element such as a thin film transistor (TFT) is individually provided in the pixels.

The upper and lower polarizers are attached to the outside of the liquid crystal panel 10, and the lower polarizer polarizes the light passing through the backlight unit. The upper polarizer passes through the liquid crystal panel 10 Polarizes the light.

In detail, the backlight unit includes a light emitting diode (LED) assembly for emitting light on one side of a light guide plate, and a reflection plate is provided on a back surface of the light guide plate.

The light emitted from the LED array of the LED assembly is incident on a side surface of the light guide plate having a transparent material. The reflection plate disposed on the back surface of the light guide plate reflects the light transmitted to the back surface of the light guide plate toward the optical sheets on the upper surface of the light guide plate, reduce the loss thereby improving the uniformity.

The liquid crystal panel 10 composed of the color filter substrate and the array substrate is mounted on the upper part of the backlight unit thus configured through the guide panel 30. The liquid crystal panel 10, the guide panel 30, are connected to each other by a cover bottom (not shown) through a screw to constitute a liquid crystal display device.

At this time, the guide panel 30 is made of SUS (Steel Use Stainless) material of about 0.3 t to 0.4 t manufactured by pressing, and is fastened to the cover bottom at the outer periphery. A bending portion 35 serving as a guide is provided on one side and a coupling groove P for fastening the panel guide 25 of the cover bottom is formed.

The bending shape is applied to the press guide panel 30 and the cover bottom to guide the liquid crystal panel 10 and the panel guide of the cover bottom fastened through the fastening groove P of the guide panel 30 A silicon pad 42 and a guide piece 43 of a molded material are further applied between the liquid crystal panel 10 and the liquid crystal panel 10 to prevent the liquid crystal panel 10 from flowing.

However, the press guide panel 30 made of SUS is not only thin with a thickness of about 0.3 t to 0.4 t, but also has a structure that is vulnerable to bending deformation because a large number of coupling grooves P are formed.

The occurrence of warpage and flatness of the press guide panel 30 causes a defect that the black uniformity of the liquid crystal panel 10, which is a problem of the in-plane switching (IPS) type liquid crystal display, is lowered Meanwhile, light leakage through the plurality of coupling grooves P occurs. The unstable guide of the guide panel 30 and the bending portion of the guide panel 30 and the panel guide 25 of the cover bottom are unstable and unstable so that the liquid crystal panel 10 is not correctly seated, this shift in poor BM (Black Matrix) is generated.

In addition, when the liquid crystal panel 10 is assembled, the central stress of the press guide panel 30 causes a cracking in the liquid crystal panel 10, or the silicon pads 42 and the guide pieces 43), the additional cost is increased and the workability is lowered.

It is an object of the present invention to provide a liquid crystal display device in which an insert mold structure is applied to a press guide panel to improve a bending property.

Another object of the present invention is to provide a liquid crystal display device in which a liquid crystal panel is mounted without any additional structure such as a silicon pad or a guide piece, while improving an unstable guide and unstable fastening of the liquid crystal panel.

Other objects and features of the present invention will be described in the following description of the invention and claims.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel that outputs an image; A backlight unit installed on a rear surface of the liquid crystal panel and emitting light over the entire surface of the liquid crystal panel; A cover bottom and a press guide panel for receiving and fixing the backlight unit; And an insert mold which is manufactured through a mold on the upper front surface of the press guide panel and seats and guides the liquid crystal panel.

In this case, the press guide panel is fastened to the cover bottom at an outer periphery thereof with the insert mold applied thereto.

And the insert mold has a rectangular frame shape in the form of the press guide panel.

The insert mold has a double frame structure of a first insert mold for guiding the liquid crystal panel and a second insert mold for seating the liquid crystal panel.

The first insert mold guiding the liquid crystal panel may include a first panel guide and a second panel guide formed in a direction perpendicular to the first insert mold.

In this case, the second panel guide protrudes toward the second insert mold to guide the liquid crystal panel.

The first panel guide and the second panel guide guide the liquid crystal panel in X and Y axis directions.

The first insert mold and the second insert mold are formed on the upper surface of the press guide panel through a molding method using a mold material so that the liquid crystal panel is seated.

The first insert mold and the second insert mold each have an open portion formed at a lower portion thereof to relax shrinkage of the liquid crystal panel in a low temperature state.

As described above, the liquid crystal display device according to the present invention provides an effect of realizing a narrow bezel with a sufficient rigidity by applying an insert mold structure to a press guide panel to improve the bending property. In addition, as described above, the improvement of the flatness improves the black uniformity of the liquid crystal panel, and at the same time, the BM shift failure of the liquid crystal display device can be prevented.

In addition, the liquid crystal display device according to the present invention provides an effect of reducing the material cost and improving the workability by eliminating the additional configuration such as the silicon pad or the guide piece for seating the liquid crystal panel.

1 is a perspective view schematically showing a structure of a general liquid crystal display device.
2 is an enlarged perspective view of part A of the general liquid crystal display shown in FIG.
3 is an enlarged perspective view of a portion B of the general liquid crystal display shown in FIG.
4 is a perspective view schematically showing a structure of a liquid crystal display device according to an embodiment of the present invention.
FIGS. 5A and 5B are enlarged perspective views of a portion C of the liquid crystal display according to the embodiment of the present invention shown in FIG. 4; FIG.
FIG. 6 is a perspective view schematically showing the structure of the insert mold shown in FIG. 5B; FIG.
7A and 7B are photographs showing, for example, a guide panel used for stiffness simulation.
8A and 8B are simulation results showing deformation and stress test results in a general press guide panel.
9A and 9B are simulation results showing a result of deformation and stress test in a press guide panel to which an insert mold according to an embodiment of the present invention is applied.

Hereinafter, preferred embodiments of the liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

4 is a perspective view schematically showing a structure of a liquid crystal display device according to an embodiment of the present invention.

5A and 5B are enlarged perspective views of a portion C of the liquid crystal display according to the embodiment of the present invention shown in FIG.

5A shows a part of the guide panel on which the liquid crystal panel is mounted, and FIG. 5B shows a part of the guide panel on which the liquid crystal panel is removed.

6 is a perspective view schematically showing the structure of the insert mold shown in FIG. 5B.

Referring to the drawings, a liquid crystal display according to an embodiment of the present invention includes a liquid crystal panel 110 in which pixels are arranged in a matrix to output an image, a driving unit (not shown) for driving the pixels, And a guide panel 130 for receiving and fixing a backlight unit that emits light over the entire surface of the liquid crystal panel 110. [

Although not shown, the liquid crystal panel 110 includes a color filter substrate, an array substrate, and a liquid crystal layer formed in a cell gap between the color filter substrate and the array substrate so that a uniform cell gap is maintained opposite to each other.

Wherein the color filter substrate comprises a color filter composed of a plurality of sub-color filters embodying a color of red, green and blue and a color filter separating the sub- And a transparent common electrode for applying a voltage to the liquid crystal layer.

The array substrate includes a plurality of gate lines and data lines arranged vertically and horizontally to define a plurality of pixel regions, a thin film transistor serving as a switching element formed in a crossing region between the gate lines and the data lines, and pixel electrodes formed on the pixel regions . In this case, in the case of an in-plane switching (IPS) liquid crystal display device, a common electrode is formed on the array substrate instead of the color filter substrate.

In the liquid crystal panel 110 in which the color filter substrate and the array substrate are bonded together, a common electrode and a pixel electrode are formed to apply an electric field to the liquid crystal layer. Data applied to the pixel electrode in a state where a voltage is applied to the common electrode When the voltage of the signal is controlled, the liquid crystal of the liquid crystal layer rotates by dielectric anisotropy according to an electric field between the common electrode and the pixel electrode to transmit or block light for each pixel to display characters or images.

The upper and lower polarizers are attached to the outside of the liquid crystal panel 110, and the lower polarizer polarizes the light passing through the backlight unit. The upper polarizer passes through the liquid crystal panel 110 Polarizes the light.

In detail, the backlight unit is provided with a light emitting diode assembly for emitting light on one side of the light guide plate, and a reflection plate is provided on the back side of the light guide plate.

The light emitted from the LED array of the LED assembly is incident on a side surface of the light guide plate having a transparent material. The reflection plate disposed on the back surface of the light guide plate reflects the light transmitted to the back surface of the light guide plate toward the optical sheets on the upper surface of the light guide plate, And the uniformity is improved.

The liquid crystal panel 110 including the color filter substrate and the array substrate is mounted on the upper part of the backlight unit thus configured through the guide panel 130. The liquid crystal panel 110 and the guide panel 130 and the backlight unit are fastened (Not shown) through a lower cover bottom (not shown) to constitute a liquid crystal display device.

At this time, the guide panel 130 manufactured by the press is fastened to the cover bottom at the outer periphery in a state where the insert mold 150 manufactured through the mold is applied to the upper part thereof, and the liquid crystal panel 110 is fixed to the insert mold 150, and guided through the plurality of panel guides 151, 152.

A general press guide panel is applied to a liquid crystal panel such as a model for navigation of an automobile, and the width of a liquid crystal panel mounting part can be reduced as compared with a mold guide panel, thereby making it possible to implement a narrow bezel.

However, as described above, such a press guide panel is disadvantageous in that the rigidity of a single product is poor and management is difficult due to problems such as flatness.

Therefore, in the present invention, the structure of the insert mold 150 is applied to the upper part of the press guide panel 130 to improve the bending property, while applying a simple and stable structure for guiding the liquid crystal panel 110, It characterized in that to improve a shift and low light leakage.

Further, according to the present invention, it is possible to eliminate additional structures such as a silicon pad or a guide piece for seating the liquid crystal panel 110 by applying the insert mold 150, thereby reducing the material cost and improving the workability.

The insert mold 150 may have a rectangular frame shape in the form of the press guide panel 130 and may include a first insert mold 150a for guiding the liquid crystal panel 110 and a second insert mold 150b for guiding the liquid crystal panel 110 And a second insert mold 150b for mounting the second insert mold 150b.

The first insert mold 150a for guiding the liquid crystal panel 110 includes a first panel guide 151 and a second panel guide 152 formed in a direction perpendicular to the first insert mold 150a In particular, the second panel guide 152 protrudes toward the second insert mold 150b to guide the liquid crystal panel 110.

The first panel guide 151 and the second panel guide 152 are configured such that the liquid crystal panel 110 is guided in the X and Y axis directions and the stable mounting of the liquid crystal panel 110 relative to the bending portion of the conventional guide panel Further, as described above, there is no need for an additional structure such as a silicon pad or a guide piece for seating the liquid crystal panel 110. Thus it can be made approximately $ 0.15 of cost reduction.

The first insert mold 150a and the second insert mold 150b are configured such that the liquid crystal panel 110 is seated and a mold material such as polycarbonate (PC) ), Which is formed through the insert method, and plays a role of improving the warping characteristics of the product.

The first insert mold 150a and the second insert mold 150b are formed to have a minimum width for the inner bezel and open portions 151 'and 152' are formed at the bottom of the first insert mold 150a and the second insert mold 150b, respectively It is possible to alleviate the shrinkage of the product at a low temperature and at the same time to weaken the pressure for pressing the liquid crystal panel 110, thereby improving defective appearance such as low temperature light leakage.

Hereinafter, the rigidity characteristics of the press guide panel of the present invention to which the conventional press guide panel and the insert mold are applied will be described in detail through simulation.

7A and 7B are photographs showing, for example, a guide panel used for stiffness simulation.

7A illustrates a conventional press guide panel, and FIG. 7B illustrates a press guide panel to which an insert mold according to an exemplary embodiment of the present invention is applied. Referring to FIG.

At this time, the stiffness simulation test is performed, for example, by applying a force in the Z-axis direction to one point while holding four points and fixing three points.

For example, the three fixed points created points at the midpoint of each slope, and a force of 100 N in the Z-axis direction was applied to the remaining one point.

8A and 8B are simulation results showing deformation and stress test results in a general press guide panel.

Referring to the drawings, in the general press guide panel, the maximum values of deformation amount and stress were measured to be 26.682 mm and 23506 MPa, respectively.

9A and 9B are simulation results showing the results of deformation and stress test in a press guide panel to which an insert mold according to an embodiment of the present invention is applied.

  Referring to the drawings, in the general press guide panel, the maximum values of deformation amount and stress were measured to be 16.447 mm and 3442.8 MPa, respectively.

As described above, the amount of deformation is reduced by about 10 mm compared to the prior art, and the stress is reduced by about 38%, while the stress is reduced by about 1/10 to 85%, thereby improving the rigidity.

While a great many are described in the foregoing description, it should be construed as an example of preferred embodiments rather than limiting the scope of the invention. Therefore, the invention should not be construed as limited to the embodiments described, but should be determined by equivalents to the appended claims and the claims.

110: liquid crystal panel 130: guide panel
150, 150a, 150b: insert mold 151, 152: panel guide
151 ', 152': open section

Claims (9)

A liquid crystal panel for outputting an image;
A backlight unit installed on a rear surface of the liquid crystal panel to irradiate light to the liquid crystal panel;
A cover bottom and a press guide panel for receiving and fixing the backlight unit; And
And an insert mold on an upper portion of the press guide panel, the insert mold having the liquid crystal panel mounted thereon to guide the liquid crystal panel,
Wherein the insert mold has a double frame structure of a first insert mold for guiding the liquid crystal panel and a second insert mold for seating the liquid crystal panel. The liquid crystal display of claim 1, wherein the press guide panel is fastened to the cover bottom at an outer periphery thereof with the insert mold applied thereto. The liquid crystal display of claim 1, wherein the insert mold has a rectangular frame shape in the form of the press guide panel. delete The liquid crystal display of claim 1, wherein the first insert mold guiding the liquid crystal panel has a first panel guide and a second panel guide formed in a direction perpendicular to the first insert mold. The liquid crystal display of claim 5, wherein the second panel guide protrudes toward the second insert mold to guide the liquid crystal panel. The liquid crystal display device according to claim 5, wherein the first panel guide and the second panel guide guide the liquid crystal panel in X and Y axis directions. The liquid crystal display of claim 1, wherein the first insert mold and the second insert mold are formed on the upper part of the press guide panel through a molding method using a molding material in which the liquid crystal panel is seated. The liquid crystal display of claim 1, wherein each of the first insert mold and the second insert mold has an open portion formed under the first insert mold and the second insert mold, thereby relieving the shrinkage of the liquid crystal panel in a low temperature state.

Images