KR100816366B1 - In-Plane switching mode LCD - Google Patents

Abstract

The present invention relates to a liquid crystal display device, and more particularly, to a transverse electric field type liquid crystal display device.

To summarize the present invention, a transparent conductive metal is formed on the front surface of the transverse electric field type liquid crystal panel to discharge electric charges introduced from the outside to the outside of the liquid crystal panel.

In this case, since the liquid crystal is not affected by the electric charges introduced from the outside, the problem of unevenness in the liquid crystal panel can be solved.

Description

Transverse electric field type liquid crystal display device {In-Plane switching mode LCD}             

1 is a cross-sectional view for explaining the operation characteristics of the transverse electric field mode,

2 is a plan view schematically illustrating a part of an array substrate for a transverse electric field type liquid crystal display device;

FIG. 3 is a cross-sectional view schematically illustrating a cross section of the liquid crystal panel obtained by cutting IV-IV ′ of FIG. 2.

4 is a schematic plan view of a transverse electric field type liquid crystal display device according to the present invention;

FIG. 5 is a cross-sectional view taken along the line VV ′ of FIG. 4.

<Brief description of the main parts of the drawing>

100 liquid crystal display device 102 upper substrate

104: lower substrate 106: gate TCP

108: data TCP 110: drive IC

112: gate PCB 114: data PCB

116: terminal wiring 118: transparent conductive metal layer

120: conductive tape 122: dummy pattern

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a transverse electric field type liquid crystal display device manufactured so that spots are not generated by charges introduced from the outside.

In general, the driving principle of the liquid crystal display device uses the optical anisotropy and polarization of the liquid crystal. Since the liquid crystal is thin and long in structure, the liquid crystal has directivity in the arrangement of molecules, and the direction of the molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal.

Accordingly, if the molecular arrangement direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular arrangement direction of the liquid crystal due to optical anisotropy to express image information.

Currently, an active matrix liquid crystal display device (AM-LCD: abbreviated as an active matrix LCD, abbreviated as a liquid crystal display device) in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner has the best resolution and video performance. It is attracting attention.

The liquid crystal display includes a color filter substrate (upper substrate) on which a common electrode is formed, an array substrate (lower substrate) on which a pixel electrode is formed, and a liquid crystal filled between upper and lower substrates. The liquid crystal is driven by an electric field applied up and down by the pixel electrode, so that the characteristics such as transmittance and aperture ratio are excellent.

However, the liquid crystal drive by the electric field applied up-down has a disadvantage that the viewing angle characteristics are not excellent. Therefore, new techniques have been proposed to overcome the above disadvantages. The liquid crystal display device to be described below has an advantage of excellent viewing angle characteristics by a liquid crystal driving method using a transverse electric field.

Hereinafter, a general transverse electric field type liquid crystal display device will be described in detail with reference to FIG. 1.

1 is a cross-sectional view showing a cross section of a general transverse electric field type liquid crystal display device.

As shown, the upper substrate 9, which is a color filter substrate, and the lower substrate 10, which is an array substrate, are spaced apart from each other and face each other. A liquid crystal layer 11 is interposed between the upper and lower substrates 9, 10. It is.

The common electrode 17 and the pixel electrode 30 are formed on the same plane on the lower substrate 10.

The liquid crystal layer 11 is operated by the horizontal electric field L of the common electrode 17 and the pixel electrode 30.

2 is a plan view schematically illustrating a part of a conventional array substrate for a transverse electric field type liquid crystal display device.

As shown in the drawing, a conventional array substrate 10 for a transverse electric field type liquid crystal display device has a plurality of gate wirings 12 arranged in one direction in parallel with a predetermined interval therebetween and in parallel with and close to the gate wiring 12. The storage wiring 16 arranged in one direction and the data wiring 24 intersecting the two wirings, and in particular the gate wiring 12, define the pixel region P.

The thin film transistor T including the gate electrode 14, the active layer 20, the source electrode 26, and the drain electrode 28 is formed at the intersection of the gate wiring 12 and the data wiring 24. The source electrode 26 is connected to the data line 24 and the gate electrode 14 is connected to the gate line 12.

The pixel electrode 30 connected to the drain electrode 28 and the common electrode 17 connected in parallel with the pixel electrode 30 and connected to the storage wiring 16 are disposed on the pixel area P. This is made up.

The pixel electrode 30 includes an extension part 30a extending from the drain electrode 28, a plurality of vertical parts 30b extending vertically from the extension part 30a and spaced apart from each other by a predetermined distance, and the storage wiring. It consists of a horizontal part 30c which connects the vertical part 30b to one in the upper part of 16.

The common electrode 17 extends vertically downward from the storage wiring 16, and includes a plurality of vertical portions 17b intersecting with the vertical portions 30b of the pixel electrode, and the vertical portions 17b. It consists of a horizontal portion (17a) for connecting one.

The vertical portion 17b of the common electrode 17 formed in the pixel area P is configured to be spaced apart from the data line 24 by a predetermined distance.

3 is a cross-sectional view illustrating a cross section of a transverse electric field type liquid crystal panel cut along line IV-IV ′ of FIG. 2.

As illustrated, the liquid crystal panel 21 is formed by bonding the color filter substrate, which is the upper substrate 9, and the array substrate, which is the lower substrate 10, to be bonded.                         

The black matrix 42 and the color filter 44 are formed on the upper substrate 9, and the passivation layer 46 and the first alignment layer 48 are sequentially formed on the black matrix 42 and the color filter 44. do.

As described above, the lower substrate 10 includes a common electrode 17b and a pixel electrode 30b.

A second alignment layer 34 is formed on the uppermost layer of the substrate 10 including the common electrode 17b and the pixel electrode 30b.

The black matrix 42 is configured to correspond to a region spaced apart from the common electrode 17b adjacent to the data line 24.

The first polarizing plate 52 and the second polarizing plate 54 are attached to front surfaces of the upper substrate 9 and the lower substrate 10, respectively.

When driving the liquid crystal panel 21 having the above-described configuration, a transverse electric field is distributed between the common electrode 17b and the pixel electrode 30b to drive the liquid crystal 50.

In the transverse electric field type liquid crystal display device configured as described above, charges Q1 may be introduced from the outside by static electricity, and in this case, when the amount of charges Q1 is greater than the charges Q2 transferred to the electrode, The liquid crystals 50 are not properly controlled so that they do not exhibit normal operating characteristics.

Therefore, unevenness occurs in the liquid crystal panel.

The present invention has been proposed for the purpose of solving the above problems, to form a transparent conductive metal layer on the upper portion of the liquid crystal panel manufactured by bonding the upper substrate and the lower substrate to discharge the electric charge introduced from the outside.

In this case, abnormal alignment of the liquid crystal does not occur due to electric charges introduced into the liquid crystal panel from the outside, so that unevenness does not occur.

A transverse electric field type liquid crystal display device according to the present invention for achieving the above object includes a first substrate; A second substrate spaced apart from the first substrate, the second substrate including a gate wiring, a data wiring, a storage wiring, a common electrode, and a pixel electrode; A plurality of gates TCP in contact with one side of the first substrate, and a plurality of data TCPs configured in an area not parallel to the plurality of gates TCP; A transparent conductive metal layer formed on the entire surface of the first substrate not facing the second substrate; A conductive tape bonded over the transparent conductive metal layer and the lower substrate; A first polarizing plate formed on the transparent conductive metal layer; And a second polarizing plate configured under the second substrate.

A conductive dummy pattern in contact with the conductive tape is further formed on the lower substrate.

The dummy pattern is configured to contact the gate TCP or data TCP.

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

Example

The transverse electric field type liquid crystal display device according to the present invention is characterized by forming a transparent conductive metal layer on the entire surface of the liquid crystal panel formed by bonding the upper substrate and the lower substrate.

Hereinafter, the transverse electric field type liquid crystal display device according to the present invention will be described with reference to FIGS. 4 and 5.

4 is a plan view schematically illustrating a transverse electric field type liquid crystal display device according to an exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line VV ′ of FIG. 4.

As shown, the liquid crystal panel 100 includes an array substrate, which is a lower substrate 104, and a color filter substrate, which is an upper substrate 102. The lower substrate 104 is formed with a gate wiring as described with reference to FIG. Storage wiring, data wiring, common electrode, pixel electrode, and thin film transistor are included.

On one side and the other side of the liquid crystal panel 100, gate TCP 106 and data TCP 108 are respectively formed by using an anisotropic adhesive at one end of the gate line (not shown) and one end of the data line (not shown). Attach.

The TCP refers to a state in which the driver IC 110 is attached and packaged on a flexible film.

One side of the gate TCP 106 and the data TCP 108 is attached to the first PCB substrate 112 and the second PCB 114 substrate, respectively.

Therefore, each of the TCPs 106 and 108 sequentially transmits the signals input from the PCB substrates 112 and 114 to the liquid crystal panel 100.

In this case, the gate signal is transferred to the first PCB substrate 112 through the second PCB substrate 114 and the terminal wiring 116 and sequentially input to the gate wiring (not shown) through the gate TCP 106.

The conductive metal layer 118 is formed by depositing a transparent conductive metal material including indium tin oxide (ITO) and indium zinc oxide (IZO) on the entire surface of the liquid crystal panel 100 fabricated as described above. .

After the conductive metal layer 118 is formed, the conductive tape 120 is adhered to the conductive metal layer 118 and the lower substrate 104.

In this case, the lower substrate 104 is provided with a dummy pattern 122 that can contact the conductive tape 120.

At this time, the dummy pattern 122 is in contact with the dummy line of the TCP.

As described above, when the transverse electric field type liquid crystal display device is configured, charges introduced from the outside of the liquid crystal panel 100 are discharged to the outside through the conductive metal layer 118, the conductive tape 120, and the dummy pattern 122. .

In addition, the conductive metal layer 118 may be formed on the opposite side of the gate TCP 106 or the data TCP 108, and may be discharged using a dummy material connected to the upper substrate 102. The conductive metal layer and the TCP may be connected to the circuit.

The first polarizing plate 130a and the second polarizing plate 130b are formed on the upper and lower portions of the liquid crystal panel 100 as described above, thereby manufacturing a transverse electric field type liquid crystal display device according to the present invention.

Accordingly, the transverse electric field type liquid crystal display device according to the present invention forms a transparent conductive metal on the entire surface of the liquid crystal panel to discharge electric charges introduced from the outside, so that the alignment direction of the liquid crystal is changed by the introduced electric charges. The phenomenon that occurs can be prevented.

Therefore, there is an effect that can produce a transverse electric field type liquid crystal display device that implements high luminance.

Claims (3)

A first substrate; A second substrate spaced apart from the first substrate, the second substrate including a gate wiring, a data wiring, a storage wiring, a common electrode, and a pixel electrode; A plurality of gate TCPs connected to the gate wires on one side of the second substrate and a plurality of data TCPs connected to the data wires in an area not parallel to the gate wires; A transparent conductive metal layer formed on the entire surface of the first substrate not facing the second substrate; A conductive tape in contact with said transparent conductive metal layer and extending to said second substrate; A first polarizing plate formed on the transparent conductive metal layer; A second polarizing plate formed under the second substrate Transverse electric field type liquid crystal display device comprising a. The method of claim 1, And a conductive dummy pattern in contact with the conductive tape on the second substrate. The method of claim 2, And the dummy pattern is in contact with the gate TCP or data TCP.

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