KR100652059B1 - Liquid Crystal Display Device - Google Patents

Abstract

An object of the present invention is to provide a liquid crystal display device suitable for preventing irregularities in the screen due to an increase in the Ioff of the electrostatic element due to photocurrent. The liquid crystal display device for achieving the above object is provided inside the cover bottom. A backlight unit provided; A liquid crystal panel including upper and lower substrates filled with liquid crystals, and having a display area and a non-display area defined therein, wherein a gate pad, a data pad, and an electrostatic element are formed in the non-display area; A supporter main bent to surround the top and side surfaces of the cover bottom to cover the bottom of the electrostatic element formed in the liquid crystal panel; Characterized in that the case top formed in a rectangular frame to surround the upper edge of the liquid crystal panel and the side of the supporter main.

Electrostatic Device, Supporter Main

Description

Liquid Crystal Display Device

1 is a schematic plan view of a liquid crystal display according to the related art

2 is a schematic structural cross-sectional view of a liquid crystal display device according to the prior art;

3 is a structural cross-sectional view of the electrostatic device of FIG.

4 is a plan view of a liquid crystal display according to an exemplary embodiment of the present invention.

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

Explanation of symbols on the main parts of the drawings

31: gate line 31a: gate electrode

32: gate insulating film 33: active layer

34: ohmic contact layer 35: data line

35a: source electrode 35b: drain electrode

40: cover bottom 41: backlight unit

42: upper substrate 43: lower substrate

44: liquid crystal panel 45: supporter main

46: case top 47: gate pad

48: data pad 49: electrostatic elements

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device suitable for minimizing the photocurrent influence of the electrostatic device.

As the information society develops, the demand for display devices is increasing in various forms.In recent years, liquid crystal display (LCD), plasma display panel (PDP), electro luminescent display (ELD), and vacuum fluorescent display (VFD) have been developed. Various flat panel display devices have been studied, and some are already used as display devices in various devices.

Among them, LCD is the most widely used as a substitute for CRT (Cathode Ray Tube) for the use of mobile image display device because of the excellent image quality, light weight, thinness, and low power consumption, and mobile type such as monitor of notebook computer. In addition, it is being developed in various ways, such as a television for receiving and displaying broadcast signals, and a monitor of a computer.

As described above, although various technical advances have been made in order for the liquid crystal display device to serve as a screen display device in various fields, the task of improving the image quality as the screen display device has many advantages and disadvantages.

Therefore, in order for a liquid crystal display device to be used in various parts as a general screen display device, development of high quality images such as high definition, high brightness, and large area is maintained while maintaining the characteristics of light weight, thinness, and low power consumption. It can be said.

The liquid crystal display (LCD) generates a contrast by injecting a liquid crystal material, which is an intermediate material between a solid and a liquid, between two thin glass plates having a special surface treatment, and changing the arrangement of liquid crystal molecules by a voltage difference between electrodes on the upper and lower glass plates. It has an operating principle for displaying an image.

A general liquid crystal display module includes a liquid crystal panel for displaying an image; A backlight unit for providing a light source to the liquid crystal panel from the rear of the liquid crystal panel, and a driving circuit unit for receiving a video signal from the outside to implement a desired screen on the liquid crystal panel.

Hereinafter, a liquid crystal display according to the related art will be described with reference to the accompanying drawings.

1 is a schematic plan view of a liquid crystal display according to the prior art, and FIG. 2 is a schematic structural cross-sectional view of the liquid crystal display according to the prior art.

3 is a structural cross-sectional view of the electrostatic device of FIG. 2.

As shown in FIGS. 1 and 2, the LCD according to the related art includes a backlight unit 21 seated inside the cover bottom 20, and upper and lower substrates 22 and 23 bonded to liquid crystals. A liquid crystal panel 24 composed of a panel), a supporter main 25 bent to cover the upper and side surfaces of the cover bottom 20 to support a lower edge of the liquid crystal panel 24, and the liquid crystal panel 24. It is composed of a case top 26 formed in a rectangular frame to surround the upper edge of the and the side of the supporter main 25.

In this case, the liquid crystal panel 24 may be divided into a display area and a non-display area, and a gate pad and a data pad formation area and an electrostatic element formation area are defined in the non-display area.

A plurality of gate pads 27 are provided at a vertical edge of the lower substrate 23 of the non-display area, and a plurality of data pads 28 are provided at a horizontal edge of the lower substrate 23. . In addition, a plurality of electrostatic elements 29 are arranged in non-display areas above and below the display area.

At this time, the supporter main 25 does not cover the lower surface of the region in which the electrostatic element 29 is formed.

In this case, the configuration of the electrostatic element 29 formed in the non-display area will be described below.

As shown in FIGS. 1 and 3, the electrostatic element 29 has a gate line 31 arranged in one direction on the lower substrate 23, and protrudes from the gate line 31 to be gated in one region. An electrode 31a is formed, and a gate insulating film 32 is provided on the entire lower substrate 43 including the gate electrode 31a, and the data line 35 is perpendicular to the gate line 31. Are arranged, a source electrode 35a protrudes on one side of the data line 35, a drain electrode 35b is formed to be spaced apart from the source electrode 35a, and the data line 35, The active layer 33 is formed in a wider width under the source electrode 35a and the drain electrode 35b. At this time, an ohmic contact layer made of n + amorphous silicon is formed between each data line 35 and the active layer 33, the source electrode 35a and the active layer 33, and the drain electrode 35b and the active layer 33. 34) is further provided. In this case, the lower active layer 33 spaced apart from the source electrode 35a and the drain electrode 35b is defined as a channel layer.

The above-described electrostatic element 29 has the same configuration as the thin film transistor of the unit pixel region in the display area, and is intended to prevent a signal distorted by static electricity when transferring data to the data line 35.

As described above, since the lower portion of the electrostatic element 29 is not covered from the supporter main 25, the electrostatic element 29 is exposed to light as it is transmitted from the backlight unit 21 to the liquid crystal panel 24.

As described above, when light is transmitted to the electrostatic element 29 as it is (in particular, the channel layer), since the active layer 33 including the channel layer is composed of amorphous silicon including hydrogen, the bonding of amorphous silicon with hydrogen This becomes very weak and the bond between silicon and hydrogen is broken and electrons move to the surface of the active layer 33, thereby increasing the photo current.

As such, when electrons move to the surface of the active layer, Ioff increases, which causes a problem of lowering operating characteristics of the electrostatic device. That is, when electrons accumulate on the surface of the active layer of the electrostatic element for a long time and act as one cap, current may flow backward through the data line, causing abnormal current to enter the display area and cause panel failure.

As described above, when the operating characteristics of the electrostatic device are deteriorated due to an increase in photo current, irregular irregularities may occur on the screen.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid crystal display device suitable for preventing the occurrence of irregular irregularities on the screen by increasing the Ioff of the electrostatic element by the photo current.

A liquid crystal display according to the present invention for achieving the above object includes a backlight unit provided inside the cover bottom; A liquid crystal panel including upper and lower substrates filled with liquid crystals, and having a display area and a non-display area defined therein, wherein a gate pad, a data pad, and an electrostatic element are formed in the non-display area; A supporter main bent to surround the top and side surfaces of the cover bottom to cover the bottom of the electrostatic element formed in the liquid crystal panel; Characterized in that the case top formed in a rectangular frame to surround the upper edge of the liquid crystal panel and the side of the supporter main.

The gate pad is formed at a vertical edge of the lower substrate, the data pad is formed at a horizontal edge of the lower substrate, and the electrostatic elements are formed in the non-display area above and below the display area. It is characterized by.

The electrostatic device includes a gate line formed in one direction on the lower substrate, a gate electrode protruding from the gate line in one region, a gate insulating layer formed on the entire surface of the lower substrate including the gate electrode, and perpendicular to the gate line. An active material having a wider width under the data lines arranged in one direction, a source electrode protruding from one side of the data line, a drain electrode spaced apart from the source electrode, and a lower portion of the data line, source electrode, and drain electrode It is characterized by including a layer.

A gate line and a data line arranged vertically and horizontally in the display area of the lower substrate, and a common line formed in at least one of upper, middle, and lower portions of the pixel area in a direction parallel to the gate line; A common electrode formed integrally with the common line and formed in the pixel area in a direction parallel to the data line, a gate electrode protruding from one side of the gate line, and a front surface of the lower substrate including the gate electrode; A gate insulating film formed, a source electrode protruding from the data line, a drain electrode spaced apart from the source electrode, an active layer having a wider width below the data line, the source electrode, and the drain electrode, and the drain electrode And pixels in contact with each other and staggered between the common electrodes. It characterized in that it comprises a pole.

The active layer is characterized by consisting of an amorphous silicon layer.

An ohmic contact layer made of n + amorphous silicon is formed under the source electrode, the drain electrode, and the data line.

Hereinafter, a liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

4 is a plan view of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 5 is a structural cross-sectional view of the liquid crystal display according to an exemplary embodiment of the present invention.

As shown in FIGS. 4 and 5, the liquid crystal display according to the exemplary embodiment of the present invention includes a backlight unit 41 provided inside the cover bottom 40 and upper and lower substrates in which liquid crystals are filled and bonded. A liquid crystal panel 44 composed of (42,43), a supporter main (45) bent to cover the upper and side surfaces of the cover bottom (40) to support the lower edge of the liquid crystal panel (44), and the liquid crystal (44) It is composed of a case top 46 formed in a rectangular frame to surround the upper edge of the panel 44 and the side surface of the supporter main 45.

In this case, the liquid crystal panel 44 may be divided into a display area and a non-display area, and a gate pad and a data pad formation area and an electrostatic element formation area are defined in the non-display area.

A plurality of gate pads 47 are provided at a vertical edge of the lower substrate 43 of the non-display area, and a plurality of data pads 48 are provided at a horizontal edge of the lower substrate 43. . In addition, a plurality of electrostatic elements 49 are arranged in the non-display areas above and below the display area. Although not shown in the drawing, a plurality of electrostatic elements may be arranged in non-display areas outside the left and right sides of the display area.

In this case, the supporter main 45 is extended to cover the lower surface of the region in which the electrostatic element 49 is formed.

The liquid crystal panel 44 includes upper and lower substrates bonded to each other with a space, and a liquid crystal layer (not shown) injected between the upper and lower substrates.

Although not shown in the drawing, gate lines and data lines arranged vertically and horizontally on the lower substrate 43 (TFT array substrate), and upper, middle, and lower portions of the pixel regions in a direction parallel to the gate lines. A common wiring formed in at least one portion of the common wiring, a common electrode formed integrally with the common wiring and formed in the pixel region in a direction parallel to the data line, and a gate electrode protruding from one side of the gate line; A gate insulating film formed of a material such as SiNx or SiOx on an entire surface of the lower substrate including the gate electrode, a source electrode protruding from the data line, a drain electrode spaced apart from the source electrode, and the data line and the source electrode An active layer having a wider width under the drain electrode and the drain; The pixel electrode is provided by being in contact with the electrode and being alternated between the common electrodes. The active layer may include an amorphous silicon layer, and an ohmic contact layer including an n + amorphous silicon layer may be further provided between the active layer and the data line, the active layer and the source electrode, and the active layer and the drain electrode.

The upper substrate 42 corresponding to the lower substrate 43 having the above-described configuration includes a black matrix layer for preventing light leakage and a color filter layer of R, G, and B formed in a portion corresponding to the pixel region. .

The upper and lower substrates 42 and 43 are bonded by a sealing material having a predetermined space by a spacer and having a liquid crystal injection hole, and a liquid crystal is injected between the two substrates.

As described above, in the liquid crystal display device of the present invention, the pixel electrode and the common electrode are formed on the lower substrate 43 by a cross, and the liquid crystal layer filled between the upper and lower substrates 42 and 43 is the lower substrate ( A transverse electric field type liquid crystal display device operated by a transverse electric field between the pixel electrode and the common electrode on 43), and a unit pixel area is manufactured by a four mask process.

When the liquid crystal display device is formed as described above, the configuration of the electrostatic element 49 in the non-display area will be described.

As described above with reference to FIG. 3, the electrostatic element 49 has a gate line 31 arranged in one direction on the lower substrate 43, protrudes from the gate line 31, and has a gate electrode in one region. The gate insulating layer 32 is formed on the entire surface of the lower substrate 43 including the gate electrode 31a, and the data line 35 is perpendicular to the gate line 31. The source electrode 35a protrudes from one side of the data line 35, the drain electrode 35b is formed to be spaced apart from the source electrode 35a, and the data line 35 and the source are disposed. The active layer 33 is formed in a wider width under the electrode 35a and the drain electrode 35b.

At this time, an ohmic contact layer made of n + amorphous silicon is formed between each data line 35 and the active layer 33, the source electrode 35a and the active layer 33, and the drain electrode 35b and the active layer 33. 34) is further provided.

In this case, the lower active layer 33 spaced apart from the source electrode 35a and the drain electrode 35b is defined as a channel layer.

The above-described electrostatic element 49 has the same configuration as the thin film transistor of the unit pixel region in the display area, and is intended to prevent a signal distorted by static electricity when transferring data to the data line 45.

According to the above, since the lower portion of the electrostatic element 49 is covered by the supporter main 45, the electrostatic element 49 is not exposed to light when the light is transmitted from the backlight unit 41 to the liquid crystal panel 44.

As described above, by extending the supporter main 45 so that the electrostatic element 49 is not exposed to the light transmitted from the backlight unit, electrons move to the surface of the active layer 33 as in the prior art, so that photocurrent ( photo current) increases, thereby increasing Ioff, thereby preventing the problem of deteriorating the operating characteristics of the electrostatic device.

In addition, it is possible to prevent the problem that the irregularity is generated on the screen by deteriorating the operating characteristics of the electrostatic element by increasing the photo current (photo current) as in the prior art.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the above embodiments, but should be defined by the claims.

The liquid crystal display of the present invention as described above has the following effects.

Since the supporter main is extended to cover the lower part of the electrostatic element, it is possible to prevent the problem that the photocurrent is increased by the light emitted from the backlight unit and the Ioff is increased.

As a result, irregular stains may not occur on the screen even after time passes.

Claims (6)

A backlight unit provided inside the cover bottom; It consists of upper and lower substrates which are filled with liquid crystal and are bonded to each other. The display area and the non-display area are defined. Gate pads and data pads are formed in the non-display area. A liquid crystal panel in which an electrostatic element is formed in a non-display area of the liquid crystal panel; A supporter main bent to surround the top and side surfaces of the cover bottom to cover the bottom of the electrostatic element formed in the liquid crystal panel; And a case top formed in a rectangular frame shape to surround an upper edge of the liquid crystal panel and a side surface of the supporter main. The method of claim 1, The gate pad is formed on the longitudinal edge of the lower substrate, And the data pad is formed at a horizontal edge of the lower substrate. The method of claim 1, The electrostatic device includes a gate line formed in one direction on the lower substrate; A gate electrode protruding from the gate line and formed in one region; A gate insulating film formed on an entire surface of the lower substrate including the gate electrode; A data line arranged in a direction perpendicular to the gate line; A source electrode protruding from one side of the data line; A drain electrode spaced apart from the source electrode, And an active layer formed wider than the data line, the source electrode, and the drain electrode. The method of claim 1, A gate line and a data line arranged vertically and horizontally in the display area of the lower substrate to define a pixel area; A common wiring formed in at least one of upper, middle, and lower portions of the pixel region in a direction parallel to the gate line; A plurality of common electrodes formed integrally with the common line and formed in the pixel area in a direction parallel to the data line; A gate electrode protruding from one side of the gate line; A gate insulating film formed on an entire surface of the lower substrate including the gate electrode; A source electrode protruding from the data line, A drain electrode spaced apart from the source electrode, An active layer having a wider width under the data line, the source electrode, and the drain electrode; And a pixel electrode in contact with the drain electrode and alternately formed between the common electrode. The method according to claim 3 or 4, And the active layer is formed of an amorphous silicon layer. The method according to claim 3 or 4, And an ohmic contact layer formed of n + amorphous silicon under the source electrode, the drain electrode and the data line.

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