KR101186865B1 - Liquid crystal display panel - Google Patents

Abstract

The present invention relates to a liquid crystal display panel capable of stably maintaining a common voltage. The liquid crystal display panel according to the present invention includes an array substrate and a color filter substrate in which an image display unit is defined; A plurality of gate lines arranged in a first direction on the array substrate; A plurality of data lines crossing the gate lines perpendicularly to define a plurality of pixels; A switching element formed at an intersection of the gate line and the data line to switch the pixel; A common electrode formed on the color filter substrate; A failure turn formed along the periphery of the image display unit and electrically connected to the common electrode; A gate pad part and a data pad part connected to one side of the gate line and the data line, respectively, to transfer signals to the gate line and the data line; A link unit connecting the gate line and the data line to the gate pad unit and the data pad unit, respectively; And a liquid crystal layer formed between the array substrate and the color filter substrate, wherein a part of the fail turn overlaps the link part, and the common electrode is a color filter substrate except for a region where the link part and the fail turn overlap. Characterized in that formed on

LCD, Fail Turn, Conductive Particles, Common Electrode

Description

Liquid Crystal Display Panel {LIQUID CRYSTAL DISPLAY PANEL}

1 is a cross-sectional view of a general liquid crystal display panel.

2A and 2B are views showing a plane and a cross section of a liquid crystal display panel according to a first embodiment of the present invention.

3A and 3B illustrate a plan view and a cross section of a liquid crystal display panel according to a second embodiment of the present invention.

*** Description of the major symbols in the drawings ***

20a: pixel electrode 20b, 120b, 220b: common electrode

133, 233: link portion 135, 235: image display portion

150, 250: failure turn 150a, 250a: conductive particles

The present invention relates to a liquid crystal display panel, and more particularly, to a liquid crystal display panel capable of stably maintaining a common voltage.

In the recent information society, the importance of the flat panel display as a visual information transmission medium is emphasized. In order for such a flat panel display device to occupy a major position in the future, it is necessary to satisfy requirements such as low power consumption, thinness, light weight, and high quality. Liquid crystal display (LCD), the flagship product of flat panel display (FPD), has not only the ability to satisfy these conditions of display but also mass production, so it is not easy to create various new products. It is rapidly becoming a core component industry that can gradually replace the existing cathode ray tube (CRT).

In general, a liquid crystal display device displays a desired image by individually supplying data signals according to image information to liquid crystal cells arranged in a matrix, thereby adjusting a light transmittance of the liquid crystal cells. to be.

To this end, the liquid crystal display device includes a liquid crystal display panel in which liquid crystal cells are arranged in a matrix, and a driving circuit unit for driving the liquid crystal display panel. The liquid crystal display panel is provided with pixel electrodes and a common electrode for applying an electric field to each of the liquid crystal cells. In general, the pixel electrode is formed for each liquid crystal cell on the array substrate, while the common electrode is integrally formed on the front surface of the color filter substrate. Each of the pixel electrodes is connected to a thin film transistor used as a switching element, and drives the liquid crystal cell together with the common electrode according to a data signal supplied through the thin film transistor.

FIG. 1 is a cross-sectional view of a liquid crystal display panel which is commonly used. As shown in the drawing, a conventional liquid crystal display panel includes a color filter substrate 15 and an array substrate 10 facing each other.

A thin film transistor and a pixel electrode 20a connected to the thin film transistor are formed in the display area A of the array substrate 10, and a black matrix 22 is formed in the display area A of the color filter substrate 15. ), The color filter 24 and the common electrode 20b are formed. The liquid crystal is injected between the array substrate 10 and the display area A of the color filter substrate 15.

The thin film transistor is connected to the pixel electrode 20a through a gate electrode 16a connected to a gate line (not shown), a source electrode 8a connected to a data line (not shown), and a drain contact hole 5. A drain electrode 8b is provided. The thin film transistor further includes a semiconductor 14a and an ohmic contact layer 14b for forming a conductive channel between the source electrode 8a and the drain electrode 8b. The thin film transistor selectively supplies a data signal from a data line (not shown) to the pixel electrode 20a in response to a gate signal from the gate line.

The pixel electrode 20a is positioned in a cell region divided by a data line and a gate line, and is made of a transparent conductive material having high light transmittance. The pixel electrode 20a is formed on the passivation layer 18 that is applied to the entire surface of the array substrate 10, and is electrically connected to the drain electrode 5b through the drain contact hole 5 passing through the passivation layer 18. The pixel electrode 20a generates a potential difference from the common electrode 20b formed on the color filter substrate 15 by a data signal supplied through the thin film transistor. Due to this potential difference, the liquid crystal located between the array substrate 10 and the color filter substrate 15 rotates due to the dielectric anisotropy. The amount of light transmitted from the light source to the color filter substrate 15 through the pixel electrode 20a is adjusted by the rotated liquid crystal.

The black matrix 22 formed in the display area of the color filter substrate 15 is formed between adjacent liquid crystal cells to absorb light incident on it, and the color filter 24 transmits any one of red, green, and blue light. The light having the other wavelength band is absorbed to display a desired color. The common electrode 20b is applied with a common voltage to generate a potential difference with the pixel electrode 20a formed on the array substrate 10.

In the non-display area B of the array substrate 10, a metal electrode 11a and a signal electrode 11b are formed, and a conductive silver dot Ag is formed between the common electrode 20b formed on the color filter substrate 15. dotting, 50). One side of the silver dot 50 is in contact with the signal electrode 11b formed on the array substrate 10, and the other side is in contact with the common electrode 20b formed on the color filter substrate 15. The common voltage supplied to the 11a is supplied to the common electrode 20b via the signal electrode 11b and the silver dot 50.

However, since the silver dot 50 is dotting in a sticky slime state, it is not easy to be uniformly doped, and when the silver dotting state is not good, between the common electrode 20b and the signal electrode 11b. The contact force at is lowered, which increases the contact resistance.

Therefore, in order to solve such a problem, a plurality of common contact holes 11c are formed on the metal electrode 11a, and irregularities are applied to the signal electrode 11b, thereby increasing the adhesive force with the silver dot 50, thereby making it common. An attempt was made to reduce the voltage contact resistance.

However, since the common electrode 20b in contact with the other side of the silver dot 50 is designed in a flat shape, the adhesive force with the silver dot 50 is relatively weak, thereby increasing the common voltage contact resistance. In other words, since the contact area between the common electrode 20b formed on the color filter substrate 15 and the silver dot 50 is narrow, the common voltage contact when supplying the common voltage from the common electrode 20b through the silver dot 50 is performed. The resistance will increase. Accordingly, since the common voltage cannot be stably supplied, there is a problem of degrading the image quality.

Accordingly, to solve the above problems, an object of the present invention is to provide a liquid crystal display panel which can stably supply a common voltage to a common electrode on a color filter substrate by forming a plurality of conductive particles in a conventional failure turn. .

In addition, the present invention by patterning the common electrode on the color filter substrate in a specific form, so that no external signal other than the common voltage is applied to the common electrode, it is possible to prevent an abnormal occurrence in the screen drive by such an external signal. Another object of the present invention is to provide a liquid crystal display panel.

In addition, it is another object of the present invention to provide a liquid crystal display panel which can improve productivity by reducing the constraint of the array substrate design so that the failure turn including the conductive particles may overlap any electrode on the array substrate.

Accordingly, in order to achieve the above object, the liquid crystal display panel according to the present invention includes an array substrate and a color filter substrate in which an image display unit is defined; A plurality of gate lines arranged in a first direction on the array substrate; A plurality of data lines crossing the gate lines perpendicularly to define a plurality of pixels; A switching element formed at an intersection of the gate line and the data line to switch the pixel; A common electrode formed on the color filter substrate; A failure turn formed along the periphery of the image display unit and electrically connected to the common electrode; A gate pad part and a data pad part connected to one side of the gate line and the data line, respectively, to transfer signals to the gate line and the data line; A link unit connecting the gate line and the data line to the gate pad unit and the data pad unit, respectively; And a liquid crystal layer formed between the array substrate and the color filter substrate, wherein a part of the fail turn overlaps the link part, and the common electrode is a color filter substrate except for a region where the link part and the fail turn overlap. It is characterized in that formed on the phase.

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The liquid crystal display panel of the present invention further includes a pixel electrode formed on the array substrate to generate an electric field together with the common electrode.

The switching element is a thin film transistor, the gate electrode formed as part of the gate line; A source electrode formed as part of the data line; And a drain electrode spaced apart from the source electrode by a predetermined interval and connected to the pixel electrode through a drain contact hole.

In addition, the liquid crystal display panel of the present invention further includes a protective film on the resultant of the array substrate, and further includes a transparent conductor layer on an area corresponding to the gate line, the data line and the switching element on the protective film. Can be.

In addition, the common electrode and the pixel electrode may be formed of at least one material selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), and tin oxide (TO). .

Hereinafter, the liquid crystal display panel of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, FIG. 2A schematically illustrates a structure of a liquid crystal display panel according to a first embodiment of the present invention. As shown in the drawing, the liquid crystal display panel of the present invention may be arranged with an array substrate 110 and a color facing each other. It is composed of a liquid crystal layer (not shown) formed in the separation space between the filter substrate 115 and the array substrate 110 and the color filter substrate 115.

In the array substrate 110 and the color filter substrate 115, pixels are arranged in a matrix to form an image display unit 135 for displaying an image. The image display unit 135 includes an array substrate 110 and a color filter substrate. The area is defined inside the failure turn 150 that engages 115.

In the image display unit 135 of the array substrate 110, a plurality of gate lines 116 arranged in a first direction are formed, and the plurality of gate lines 116 perpendicularly intersect the gate lines 116 to define a plurality of pixels. A plurality of data lines 117 are formed.

The gate pad part 131 connected to the gate lines 116 and the data lines 117 are connected to edge regions of the array substrate 110 that do not overlap the color filter substrate 115. The data pad part 132 is formed. The gate pad unit 131 supplies a scan signal supplied from a gate driver (not shown) to the gate lines 116 of the pixel unit 135, and the data pad unit 132 is provided from a data driver (not shown). The supplied image information is supplied to the data lines 117 of the pixel unit 135.

In this case, the gate pad unit 131 and the data pad unit 132 are connected to the gate line 116 and the data line 117 through the link unit 133, and the link unit 133 is the failure turn ( Overlap with part of 150).

In addition, the data lines 117 to which image information is applied and the gate lines 116 to which a scan signal is applied are arranged on the array substrate 110 so that the data lines 117 and the gate lines 116 intersect each other. The switching element (not shown) and the pixel electrode (not shown) are provided in the area | region divided by these.

In this case, the switching element is a thin film transistor, the gate electrode formed as part of the gate line, the source electrode formed as part of the data line, and the source electrode and are spaced apart from the predetermined interval, and the pixel electrode through the drain contact hole And a drain electrode connected to the pixel electrode to transmit a data signal to the pixel electrode.

Although not shown in the drawing, the color filter substrate 115 includes color filters coated for each pixel by a black matrix, and a common electrode which is a counter electrode of the pixel electrode formed on the array substrate 110. It is provided.

Therefore, when a data signal is applied to the pixel electrode and a common voltage is applied to the common electrode, an electric field is generated between the pixel electrode and the common electrode to be formed between the array substrate 110 and the color filter substrate 115. Drive the liquid crystal.

On the other hand, the failure turn 150 of the present invention is formed along the outside of the image display unit 135 in a state containing a plurality of conductive particles therein, is electrically connected to the common electrode, applying a common voltage to the common electrode Done. In this case, at least one side of the failure turn 150 is connected to at least one common voltage applying pad 135 disposed outside the array substrate 110 to receive the common voltage.

FIG. 2B is a cross-sectional view taken along line II ′ of FIG. 2A, and as shown in the drawing, a metal electrode 135a extending from a pad for applying a common voltage is formed on the array substrate 110, and a gate insulating film is formed thereon. A common contact hole penetrating through the 112 and the passivation layer 118 is formed, and the transparent conductive layer 140 is stacked on the passivation layer 118 including the common contact hole. The conductive particles 150a are disposed between the common electrode 120b formed on the color filter substrate 115 and the metal electrode 135a of the array substrate 110. One side of the failure turn 150 including the conductive particles 150a communicates with the metal electrode 135a formed on the array substrate 110, and the other side of the failed turn 150 includes the common electrode 120b formed on the color filter substrate 115. ) And a common voltage supplied from the outside to the metal electrode 135a is supplied to the common electrode 120b through the transparent conductor 140 and the conductive particles 150a.

As such, the common electrode 120b supplied with the common voltage generates an electric field together with the pixel electrode receiving the data signal.

As described above, the present invention forms a plurality of conductive particles within the failure turn, thereby stably supplying the common voltage to the common electrode on the color filter substrate.

On the other hand, the failure turn 150 according to the first embodiment of the present invention including a plurality of conductive particles (150a) is a link unit 133 connecting the plurality of gate lines and data lines and the plurality of gate pads and data pads, respectively. ) And a predetermined area overlap each other.

However, in the above configuration, an external signal such as a data signal may be applied to the conductive particles 150a disposed on the link unit 133, and thus, external signals other than the common voltage may be applied to the common electrode 120b. By transmitting, causing signal interference, an abnormality may occur in screen driving.

Furthermore, when a thin film transistor such as an antistatic circuit (not shown) adjacent to the link portion 133 contacts a failure turn including conductive particles, noise such as static electricity is common on the color filter substrate 115 through the conductive particles. It may be delivered to the electrode 120b.

Therefore, in the liquid crystal display according to the second exemplary embodiment of the present invention, in order to prevent an external signal from being applied to the common electrode on the color filter substrate through the conductive particles in the failed turn, the common part corresponding to the section where the failed turn and the link part overlap each other. By removing the electrodes, in particular, the external signal generated on the upper portion of the link portion is prevented from causing signal interference to the common voltage.

FIG. 3A illustrates a liquid crystal display panel according to a second exemplary embodiment of the present invention, which is a plan view of a color filter substrate on which a common electrode and a failure turn are formed. Since the configuration of the second embodiment is similar to that of the first embodiment, the following description will focus on the differences and the effects thereof.

Although not shown in the drawings, the liquid crystal display panel of the second embodiment is a liquid crystal layer formed in a space between the array substrate (not shown) and the color filter substrate 215 and the array substrate and the color filter substrate 215 facing each other. (Not shown).

In the array substrate and the color filter substrate 215, pixels are arranged in a matrix to form an image display unit 235 for displaying an image. The image display unit 235 bonds the array substrate and the color filter substrate 215 to each other. The region is defined within the note failure turn 250.

A plurality of gate lines (not shown) arranged in a first direction are formed in the image display unit of the array substrate, and a plurality of data lines (not shown) defining vertically crossing the gate lines. Is formed.

In addition, a gate pad portion (not shown) connected to gate lines of the image display portion and a data pad portion (not shown) are connected to edge regions of the array substrate not overlapping the color filter substrate 215. ) Is formed. The gate pad unit supplies a scan signal supplied from a gate driver (not shown) to the gate lines of the pixel unit, and the data pad unit supplies image information supplied from a data driver (not shown) to the data lines of the image display unit.

In this case, the gate pad part and the data pad part are connected to the gate line and the data line through the link part, and the link part overlaps with a part of the failure turn 250.

The array substrate is provided with a switching element (not shown) and a pixel electrode (not shown) in regions partitioned by data lines and gate lines, respectively.

In this case, the switching element is a thin film transistor, the gate electrode formed as part of the gate line, the source electrode formed as part of the data line, and the source electrode and are spaced apart from each other by a predetermined distance, the pixel through the drain contact hole And a drain electrode connected to the electrode to transmit a data signal to the pixel electrode.

Although not shown in the drawings, the color filter substrate 215 includes color filters coated for each pixel by a black matrix and a common electrode 220b which is a counter electrode of the pixel electrode formed on the array substrate. It is provided.

Therefore, when a data signal is applied to the pixel electrode and a common voltage is applied to the common electrode 220b, an electric field is generated between the pixel electrode and the common electrode 220b, such that the array substrate and the color filter substrate 215 are applied. It drives the liquid crystal formed in between.

In this case, the common electrode 220b is electrically connected to the conductive particles inside the failure turn 250 to receive a common voltage through the conductive particles, and at least one side of the failure turn 250 is disposed on the array substrate. It is connected to at least one common voltage applying pad (not shown) disposed outside, and receives a common voltage.

On the other hand, the common electrode 220b of the present invention, the link unit and the failure turn 250 to prevent the external signal generated from the link unit is transmitted to the common electrode 220b through the conductive particles in the failure turn 250 The common electrode 220b on the overlapping region is removed.

FIG. 3B is a cross-sectional view taken along the line II-II 'of FIG. 3A and illustrates a cross-sectional view of the color filter substrate 215 and the array substrate 210 corresponding thereto.

As shown in the figure, a gate insulating film 212 is stacked on the array substrate 210 according to the second embodiment of the present invention, and a data line (not shown) and a data pad (not shown) are connected thereon. Link portion 233a is formed. In addition, the passivation layer 218 and the transparent conductive layer 240 are formed on the entire surface of the array substrate 210 including the link unit 233a.

A failure turn 250 including conductive particles 250a is formed between the array substrate 210 and the color filter substrate 215 corresponding thereto.

Meanwhile, the common electrode 220b of the color filter substrate 215 in the region corresponding to the link portion 233a of the array substrate 210 is patterned so that the failure turn 250 and the common electrode 220b contact each other in this region. Since it does not, the signal interference by the external signal applied from the link unit 233a is not received.

As a result, the present invention prevents the common voltage from being distorted by the external signal by minimizing the application of the external signal by patterning the common electrode 220b.

That is, by preventing the contact between the conductive particles affected by the external signal and the common electrode, by preventing noise such as data signals or static electricity from being applied to the common electrode through the conductive particles, the common voltage is stably maintained. Normalize screen operation. In addition, since the common electrode is patterned so as not to contact the conductive particles in the failure turn, there is no restriction in design of the array substrate and the productivity of the liquid crystal display panel is improved.

The embodiments described above are illustrated to illustrate the present invention, but do not limit the scope of the present invention.

Accordingly, the scope of the invention should be determined by the appended claims rather than by the foregoing description.

Therefore, as described above, the present invention patterns the common electrode on the color filter, thereby preventing the conductive particles and the common electrode from being affected by the external signal, thereby maintaining the common voltage stably and normalizing the screen driving. do.

In addition, by reducing the constraints of the array substrate design so that the failure turn including the conductive particles may overlap any electrode on the array substrate, productivity of the liquid crystal display panel may be improved.

Claims (11)

An array substrate and a color filter substrate on which an image display unit is defined; A plurality of gate lines arranged in a first direction on the array substrate; A plurality of data lines crossing the gate lines perpendicularly to define a plurality of pixels; A switching element formed at an intersection of the gate line and the data line to switch the pixel; A common electrode formed on the color filter substrate; A failure turn formed along the periphery of the image display unit and electrically connected to the common electrode; And A gate pad part and a data pad part connected to one side of a gate line and a data line, respectively, to transfer signals to the gate line and the data line; A link unit connecting the gate line and the data line to the gate pad unit and the data pad unit, respectively; And It comprises a liquid crystal layer formed between the array substrate and the color filter substrate, A part of the failure turn overlaps the link part, and a part of the common electrode is removed in a window shape along an area where the link part and the failure turn overlap, except for a region where the common electrode overlaps the link part and the failure turn. And a failing turn of a region formed on the color filter substrate and overlapping the link part and the failing turn, electrically shorted with the common electrode. The liquid crystal display panel of claim 1, wherein the failing turn comprises a plurality of conductive particles. delete delete delete The liquid crystal display panel of claim 1, further comprising a pixel electrode formed on the array substrate to generate an electric field together with the common electrode. The liquid crystal display panel of claim 1, wherein the switching element is a thin film transistor. The method of claim 7, wherein the thin film transistor, A gate electrode formed as part of the gate line; A source electrode formed as part of the data line; And And a drain electrode facing the source electrode and spaced apart from the source electrode, the drain electrode being connected to the pixel electrode through the drain contact hole. The liquid crystal display panel of claim 1, further comprising a protective layer on the resultant of the array substrate. 10. The liquid crystal display panel of claim 9, further comprising a transparent conductor layer on an upper portion of the passivation layer corresponding to the gate line, the data line, and the switching element. The method of claim 1, wherein the common electrode is at least one material selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), and tin oxide (TO). LCD panel.

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