KR20100087960A

KR20100087960A - Liquid crystal display device

Info

Publication number: KR20100087960A
Application number: KR1020090007046A
Authority: KR
Inventors: 주종균; 박동녘
Original assignee: 엘지디스플레이 주식회사
Priority date: 2009-01-29
Filing date: 2009-01-29
Publication date: 2010-08-06
Also published as: KR101537413B1

Abstract

Embodiment of the present invention, the liquid crystal panel; A light source for emitting light; Optical sheets for providing the light emitted from the light source to the liquid crystal panel; A cover bottom including a first surface accommodating the light source, a second surface accommodating the optical sheets, and a hole bent in a lower bottom direction of the second surface; And a guide panel top attached to the cover bottom to support the optical sheets and the liquid crystal panel, respectively, and including a hook portion formed to penetrate the hole facing the second surface, wherein the diameter of the hole is widened toward the protruding end. Provided is a liquid crystal display device.

LCD, Cover Bottom, Hole

Description

[0001] The present invention relates to a liquid crystal display device,

An embodiment of the present invention relates to a liquid crystal display device.

With the development of information technology, the market for a display device, which is a connection medium between a user and information, is growing. Accordingly, flat panel displays (FPDs), such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs), and plasma display panels (PDPs), may be used. Usage is increasing.

Among the flat panel display devices as described above, liquid crystal displays are widely used because they can realize high resolution and can be miniaturized as well as large. Liquid crystal displays are classified as light receiving displays using light provided from a backlight unit positioned under the liquid crystal panel. The liquid crystal display is largely composed of a thin film transistor array substrate and a color filter substrate. The thin film transistor array substrate includes a thin film transistor including a gate, a semiconductor layer, a source and a drain, and a sub pixel including a pixel electrode and a common electrode applying an electric field to the liquid crystal layer. A color filter, a black matrix, and the like are formed on the color filter substrate.

On the other hand, there is a problem that the structure that serves as a guide when the screw assembly between the cover bottom and the guide panel top used in the conventional backlight assembly is ground or worn by external force or friction is required to improve the structural improvement.

Embodiment of the present invention for solving the above problems of the background art, solve the problem that the structure that serves as a guide when screw assembly between the cover bottom and the guide top panel is ground or worn by external force or friction to improve the reliability of the product It is to provide a liquid crystal display device that can be increased.

Embodiments of the present invention as a means for solving the above problems, the liquid crystal panel; A light source for emitting light; Optical sheets for providing the light emitted from the light source to the liquid crystal panel; A cover bottom including a first surface accommodating the light source, a second surface accommodating the optical sheets, and a hole bent in a lower bottom direction of the second surface; And a guide panel top attached to the cover bottom to support the optical sheets and the liquid crystal panel, respectively, and including a hook portion formed to penetrate the hole facing the second surface, wherein the diameter of the hole is widened toward the protruding end. Provided is a liquid crystal display device.

The cover bottom may have a stepped bent so that the second surface containing the optical sheets is higher than the first surface containing the light source.

The locking portion may protrude with a step to have a space for covering and supporting a portion of the optical sheets disposed between the second surface of the cover bottom and the guide panel top.

The distal edge of the catch may be round.

Embodiment of the present invention, the effect of providing a liquid crystal display device that can improve the reliability of the product by solving the problem that the structure that serves as a guide when screw assembly between the cover bottom and the guide top panel due to external force or friction, etc. There is.

Hereinafter, with reference to the accompanying drawings, the specific content for the practice of the present invention will be described.

1 is a cross-sectional view of a liquid crystal display device according to an exemplary embodiment of the present invention, and FIG. 2 is a diagram illustrating a structure of a liquid crystal panel.

As shown in FIG. 1, the liquid crystal display according to the exemplary embodiment of the present invention includes a liquid crystal panel 110, a light source 185, optical sheets 140, a cover bottom 170, and a guide panel top 190. It may include.

The liquid crystal panel 110 may have a structure in which the first substrate 110a on which the thin film transistor is formed and the second substrate 110b on which the color filter is formed are bonded to each other with the liquid crystal layer Cl interposed therebetween. An alignment layer may be positioned on the first substrate 110a and the second substrate 110b depending on the characteristics of the liquid crystal layer Cl. The polarizer 120 may be attached to upper and lower surfaces of the liquid crystal panel 110 to polarize light incident to the liquid crystal panel 110 and emitted light.

Hereinafter, the structure of the liquid crystal panel 110 will be described with reference to FIG. 2.

The gate 151 may be located on one surface of the first substrate 110a. The gate 151 is any one selected from the group consisting of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). It may be made of one or an alloy thereof. In addition, the gate 151 is made of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). It may be a multilayer made of any one or alloys thereof. In addition, the gate 151 may be a double layer of molybdenum / aluminum-neodymium or molybdenum / aluminum.

The first insulating layer 152 may be positioned on the gate 151. The first insulating layer 152 may be a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), or multiple layers thereof, but is not limited thereto.

An active layer 154a positioned in a region corresponding to the gate 151 may be disposed on the first insulating layer 152, and an ohmic contact layer 154b may be disposed in the active layer 154a to lower the contact resistance. have. In addition, the data line 153 may be positioned on the first insulating layer 152, but the present invention is not limited thereto.

The source 155a and the drain 155b may be positioned on the active layer 154a. The source 155a and the drain 155b may be formed of a single layer or multiple layers. When the source 155a and the drain 155b are a single layer, molybdenum (Mo), aluminum (Al), chromium (Cr), and gold may be used. (Au), titanium (Ti), nickel (Ni), neodymium (Nd) and copper (Cu) may be made of any one or an alloy thereof selected from the group consisting of. In addition, when the source 155a and the drain 155b are multiple layers, the double layer of molybdenum / aluminum-neodymium and the triple layer of molybdenum / aluminum / molybdenum or molybdenum / aluminum-neodymium / molybdenum may be used.

The second insulating layer 156 may be positioned on the source 155a and the drain 155b. The second insulating layer 156 may be a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), or a multilayer thereof, but is not limited thereto. The second insulating layer 156 may be a passivation layer.

The pixel electrode 157 connected to the source 155a or the drain 155b may be positioned on the second insulating layer 156. The pixel electrode 157 may be formed of a transparent electrode such as indium tin oxide (ITO), indium zinc oxide (IZO), or zinc oxide (ZnO).

The common electrode (not shown) may be positioned on the second insulating layer 156 to face the pixel electrode 157. The common electrode may be positioned on the first substrate 110a or the second substrate 110b.

A spacer 158 may be positioned on the first substrate 110a to maintain a cell gap with the second substrate 110b on the second insulating layer 156 corresponding to the source 155a and the drain 155b. have.

The black matrix BM may be positioned on one surface of the second substrate 110b. The black matrix BM is a non-display area and may be positioned to correspond to the area where the spacer 158 is located.

The black matrix (BM) may be formed of a photosensitive organic material to which black pigment is added, and as the black pigment, carbon black or titanium oxide may be used.

Color filters CFR, CFG, and CFB may be disposed between the black matrices BM. The color filters CFR, CFG, and CFB may have other colors as well as red (CFR), green (CFG), and blue (CFB).

The overcoat layer 159 may be positioned on the black matrix BM and the color filters CFR, CFG, and CFB. The overcoating layer 159 may be omitted in the second substrate 150b on which the black matrix BM and the color filters CFR, CFG, and CFB are formed.

Although not shown, the first substrate 110a may include a scan driver for supplying a driving signal and a driver including a data driver. The driver is connected to the data line 153 and the gate line formed on the first substrate 110a constituting the liquid crystal panel 110. The driving unit may be connected to the liquid crystal panel 110 in which a film circuit in which the driving unit is mounted is connected to a chip on film (COF) or tape carrier package (TCP) method. However, the driving unit may be directly mounted on the first substrate 110a in a chip on glass (COG) manner or may be formed and embedded on the first substrate 110a in a thin film transistor forming process.

The liquid crystal panel 110 formed as described above may display an image on each subpixel according to a scan signal supplied through the gate lines and a data voltage supplied through the data lines. Here, the scan signal may be a pulse signal in which the gate high voltage supplied for one horizontal time and the gate low voltage supplied for the remaining time are alternately limited.

Meanwhile, the thin film transistor included in the subpixel may be turned on when the gate high voltage is supplied from the gate lines to supply the data voltage applied from the data lines to the liquid crystal layer Cl. Accordingly, in the liquid crystal panel 110, when the thin film transistors of the respective sub pixels are turned on and the data voltage is applied to the pixel electrode 157, the liquid crystal layer Cl is charged with the difference voltage between the data voltage and the common voltage. Can be displayed. On the contrary, when the gate low voltage is supplied from the gate lines, the thin film transistor is turned off and the data voltage charged in the liquid crystal layer Cl may be maintained for one frame period by the storage capacitor. The liquid crystal panel 110 may repeat different operations according to a scan signal supplied through the gate lines.

The light source 185 may be formed on the printed circuit board 180. The light source 185 includes a Cold Cathode Fluorescent Lamp (CCFL), a Hot Cathode Fluorescent Lamp (HCFL), an External Electrode Fluorescent Lamp (EEFL), and a Light Emitting Diode (Light Emitting). Diode: LED) may be selected, but is not limited thereto.

The optical sheets 140 may include, but are not limited to, a diffusion plate, a diffusion sheet, a prism sheet, and a protective sheet so as to efficiently provide the light emitted from the light source 185 to the liquid crystal panel.

The cover bottom 170 may include a first surface accommodating the light source 185, a second surface accommodating the optical sheets 140, and a hole H that is bent and protruded toward the bottom surface of the second surface. . The height of the second surface formed on the cover bottom 170 and accommodating the optical sheets 140 is higher than the height of the first surface accommodating the light source 185. That is, the first surface and the second surface of the cover bottom 170 may have a stepped bent so as to form a height difference more than a predetermined interval. On the other hand, in the case of the hole (H) formed on the second surface of the cover bottom 170, the diameter of the hole (H) is formed wider toward the protruding end.

The guide panel top 190 is attached to the cover bottom 170 to support the optical sheets 140 and the liquid crystal panel 110, respectively, and a hook portion formed to penetrate the hole H of the surface facing the second surface ( 195). The locking unit 195 may protrude with a step to have a space for covering and supporting a part of the optical sheets 140 disposed between the second surface of the cover bottom 170 and the guide panel top 190.

The engaging portion 195 formed in the guide panel top 190 and the hole H formed in the cover bottom 170 are screws to which the screw is fastened when assembling the screw for attachment between the cover bottom 170 and the guide panel top 190. It acts as a guide to increase the workability by preventing the flow of holes. In general, the diameter of the locking portion 195 formed to penetrate the hole H formed in the cover bottom 170 has an area substantially the same as the diameter of the hole H. In the case of the locking unit 195, the distal edge of the locking unit 195 may be formed in a rounded shape so as to fit smoothly into the hole (H), but is not limited thereto.

Hereinafter, the hole H formed in the cover bottom 170 will be described in more detail.

3 is a partial view of the cover bottom for explaining a process of expanding the diameter of the hole formed in the cover bottom, Figure 4 is a view after the process of Figure 3 is completed.

As shown in FIGS. 3 and 4, the hole H formed in the cover bottom 170 is widened by a reverse punching process of the punch PH applied in the lower bottom direction of the second surface of the cover bottom 170. Can be. This process is applicable to the cover bottom 170 conventionally used.

As shown in the figure, the shape of the punch PH may be one having a narrowly narrowed shape where the width of the lower pillar is narrower than the width of the upper pillar so that the diameter of the hole H becomes wider toward the protruding end.

As described above, when the reverse punching is performed in the hole H in the lower bottom direction of the second surface of the cover bottom 170, the following effects can be obtained.

5 is a view showing a cover bottom and a guide panel top assembled according to the prior art, Figure 6 is a view showing a cover bottom and a guide panel top assembled according to an embodiment.

First, referring to FIG. 5, a cover bottom 170 and a guide panel top 195 assembled by the prior art are shown. In the prior art, the hole H formed in the cover bottom 170 and the locking portion 195 formed in the guide panel top 195 have the same width so as to fit snugly. Therefore, when external force or friction is applied after fastening the hole H and the locking portion 195 serving as a guide when assembling the screw between the cover bottom and the guide top panel, there is a problem of grinding or wear between the guide structures. This can cause a problem of deteriorating the reliability of the product, such as foreign matter occurs.

Next, referring to FIG. 6, the cover bottom 170 and the guide panel top 195 assembled by the embodiment are shown. In the embodiment, the hole H formed in the cover bottom 170 has a structure that is wider toward the protruding end. Accordingly, even if an external force or friction is applied after the hole H and the locking portion 195 that serve as guides when the screw is assembled between the cover bottom and the guide top panel, the area to be ground or worn between the structures serving as the guide is reduced. Since it rarely exists, it is possible to improve the problem of deteriorating the reliability of the product, such as foreign matter occurs.

Embodiments of the present invention provide a liquid crystal display device that can improve the reliability of the product by solving the problem that the structure that serves as a guide when screw assembly between the cover bottom and the guide top panel due to external force or friction, etc. It works.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

1 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.

2 is a diagram illustrating a structure of a liquid crystal panel.

3 is a partial view of the cover bottom for explaining the process of expanding the diameter of the hole formed in the cover bottom.

4 is a view after the process of FIG. 3 is completed.

Figure 5 is a view showing a cover bottom and a guide panel top assembled by the prior art.

6 is a view showing the cover bottom and the guide panel top assembled by the embodiment.

110: liquid crystal panel 120: polarizing plate

140: optical sheets 170: cover bottom

190: guide panel top 195: locking portion

Hall: H

Claims

A liquid crystal panel;

A light source for emitting light;

Optical sheets for providing the light emitted from the light source to the liquid crystal panel;

A cover bottom including a first surface accommodating the light source, a second surface accommodating the optical sheets, and a hole bent in a lower bottom direction of the second surface; And

And a guide panel top attached to the cover bottom and supporting the optical sheets and the liquid crystal panel, respectively, and including a locking portion formed to penetrate the hole on the surface facing the second surface.

The diameter of the hole, the liquid crystal display device characterized in that it is wider toward the protruding end.

The method of claim 1,

The cover bottom is,

And a step which is bent so that the second surface for accommodating the optical sheets is higher than the first surface for accommodating the light source.

The method of claim 1,

The locking portion,

And a stepped portion protruding to have a space for supporting and supporting a portion of the optical sheets disposed between the second surface of the cover bottom and the guide panel top.

The method of claim 1,

The end edge of the locking portion is a liquid crystal display, characterized in that the rounded shape.