KR100731025B1 - Liquid Crystal Display Panel and Fabrication Method for the same - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a liquid crystal display panel having a high aperture ratio and a method of manufacturing the liquid crystal display panel, wherein the liquid crystal display panel includes a first substrate having a plurality of data wirings and gate wirings each formed to cross each other, and a liquid crystal between the second substrate. An implanted liquid crystal display panel comprising: a thin film transistor formed on an intersection of data and gate lines on the first substrate; A pixel electrode connected to the thin film transistor; A color filter layer formed on the pixel electrode; A spacer formed by any one of a column spacer and a black matrix between the data line and the second substrate so as to contact the data line and the second substrate, and the spacer formed as described above prevents the formation of an abnormal liquid crystal layer. It completely blocks the light between the pixels to prevent light leakage in the left and right viewing angle directions and improves the panel transmittance (opening ratio).

Column spacer

Description

Liquid crystal display panel and its manufacturing method {Liquid Crystal Display Panel and Fabrication Method for the same}

1A is a plan view of a typical liquid crystal display panel

FIG. 1B is a cross-sectional view taken along the line II ′ of FIG. 1A.

1C is a plan view of a typical liquid crystal display panel

2A is a plan view of a liquid crystal display panel according to the present invention.

FIG. 2B is a cross-sectional view taken along the line II-II 'of FIG. 2A

FIG. 2C is a cross-sectional view taken along the line III-III 'of FIG. 2A

* Explanation of symbols for main parts of the drawings

1: upper glass 2: black matrix

3: color filter layer 4: common electrode

5 pixel electrode 6 protective film

7: insulating film 8: data wiring

9: lower glass 10: top plate

11: lower plate 12: gate wiring

13 spacer 14 gate electrode

15 semiconductor layer 16 ohmic contact layer                 

17 source electrode 18 drain electrode

The present invention relates to a liquid crystal display panel having a high aperture ratio and a manufacturing method thereof.

The TFT LCD panel controls the incident light of the backlight by using the birefringence of the liquid crystal, and the traveling direction of the incident light is a device which controls and displays the incident light by using the property of rotating in the major axis direction of the liquid crystal molecules, so that the liquid crystal is the incident direction of the incident light. Because the refractive index varies depending on the screen, the screen looks dark or inverted, so the viewing angle is narrower than that of the CDT.

FIG. 1A is a plan view of a general liquid crystal display panel in which a color filter layer is disposed on an upper glass, and FIG. 1B is a cross-sectional view taken along the line II ′ of FIG. 1A.

As shown in Fig. 1B, in the general structure, a black matrix 2 is arranged on the upper glass 1 to block the abnormal operation layer of the liquid crystal formed on the color filter layer 3 and the data wiring 8 above.

The liquid crystal layer formed between the color filter layer 3 and the ITO pixel electrode 5 transmits light incident from the polarizing plate formed on one side of the lower glass 9 to be applied to the pixel electrode 5 and the common electrode 4. The alignment direction is changed according to the alignment direction of the alignment layer, and the transmitted light is selectively passed through the polarizer according to the alignment state of the liquid crystal layer.

At this time, the light transmitted through the lower glass 9 by the abnormal liquid crystal layer is blocked by using the black matrix 2 to remove the interference between the pixels.

However, when the upper and lower plates 10 and 11 are misaligned, light is not blocked by the black matrix 2 and affects adjacent pixels depending on the arrangement state of the abnormal liquid crystal layer.

1C is a plan view of a general liquid crystal display panel, in which a color filter layer is disposed on a lower glass.

As shown in FIG. 1C, the color filter layer 3 is disposed on the lower plate 11 to fundamentally eliminate the upper and lower plates 10 and 11 miss-alignment problems in the general structure of FIGS. 1A and 1B. transistor).

In this case, the black matrix may be replaced by the wiring electrode 8 of the lower plate 11 or a separate black matrix layer (usually a resin black matrix) may be disposed on the wiring electrode 8, and the wiring electrode 8 may be disposed on the pigment. do.

The liquid crystal display panel formed on a substrate having a different TFT array and a color filter layer according to the prior art has a problem that light leaks due to abnormal operation of the liquid crystal layer when a misalignment occurs in the upper and lower panels of the LCD panel. In order to prevent this, a problem arises in that the overall aperture ratio of the panel is decreased when the black matrix is formed large.

In addition, in the case of a TFT LCD panel in which a color filter layer is disposed on a substrate on which a TFT array is formed, a problem of light leakage due to abnormal behavior of the liquid crystal layer when the liquid crystal is driven by the voltage of the pixel portion can be protected from the front, but viewed at an angle from the left and right viewing angles There is a problem that light leaks.

The above problem can be solved by installing a black matrix on the top plate, but also a margin for improving the overall aperture ratio of the panel is reduced when the black matrix is largely formed to prevent light leakage due to the misalignment of the top and bottom plates.

Accordingly, an object of the present invention is to provide a liquid crystal display panel having a high aperture ratio and a method of manufacturing the same.

Another object of the present invention is to provide a liquid crystal display panel and a method of manufacturing the same, in which a color filter layer is laminated on a lower TFT array in order to improve the aperture ratio of the color liquid crystal display panel.

Another object of the present invention is to introduce a column spacer using a resin in the design of the liquid crystal display panel to improve the light leakage problem in the left and right viewing angle and to have a high aperture ratio design margin.

A feature of the liquid crystal display panel according to the present invention for achieving the above object is a liquid crystal display panel in which a liquid crystal is injected between a first substrate and a second substrate having a plurality of data wirings and gate wirings formed to cross each other, respectively. A thin film transistor comprising: a thin film transistor formed on an intersection of data and gate lines on the first substrate; A pixel electrode connected to the thin film transistor; A color filter layer formed on the pixel electrode; And a spacer formed by any one of a column spacer and a black matrix between the data line and the second substrate so as to contact the data line and the second substrate.

A feature of the liquid crystal display panel manufacturing method according to the present invention for achieving the above object is in the manufacturing of a liquid crystal display panel in which a liquid crystal is injected between a first substrate having an active region composed of a plurality of unit pixels and a second substrate Forming a plurality of gate lines on the first substrate; Forming a thin film transistor per unit pixel of the active region, and forming a plurality of data lines in a direction crossing the plurality of gate lines; Forming a pixel electrode to be connected to the thin film transistor; Forming a spacer between any one of a column spacer and a black matrix between the data line and the second substrate so as to contact the data line and the second substrate; And forming a color filter layer on the pixel electrode.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

A preferred embodiment of a liquid crystal display panel having a high aperture ratio according to the present invention will be described with reference to the accompanying drawings.

FIG. 2A is a plan view of a liquid crystal display panel according to the present invention, and FIG. 2B is a sectional view taken along the line II-II 'of FIG. 2A.

2C is a cross-sectional view taken along the line III-III 'of FIG. 2A.

As shown in FIG. 2B and FIG. 2C, a spacer 13 capable of reaching the upper plate 10 is formed on the gate wiring and the data wiring 8.

As shown in FIG. 2B, a thin film transistor for driving pixels by turning on / off respective pixels on the liquid crystal layer and the lower glass 9 formed between the upper plate 10 and the lower plate 11, and the thin film transistor ON. A gate line 12 for applying a switching signal to be turned on / off and a data line 13 for applying a data signal, and a pixel region of the upper glass 1 and the lower glass 9, respectively, The upper plate 10 is formed to contact the upper plate 10 on the common electrode 4 and the pixel electrode 5, the R, G, and B color filter layers 3, and the data lines 8, which control the arrangement of the liquid crystal layers. It is configured to include a spacer 13 to maintain a constant space formed between the 10 and the lower plate 11 and to block light. In addition, the spacer 13 may be formed on the top plate 10 facing the data line 8 to be in contact with the top plate 10 or may be formed on the gate line 12.

In addition, although not shown, an LCD backlight formed on one side of the lower plate 11, an alignment layer formed on one side of the upper plate 10 and the lower plate 11 to align the liquid crystal layer in a fixed direction, the upper plate 10, and the lower plate. It is formed on one side of (11) and further comprises a polarizing filter that is irradiated by the backlight to control the light transmitted through the liquid crystal layer.

The spacer 13 is configured by applying a column spacer, which is being developed and applied recently, in place of a liquid crystal spacer, or by laminating a high layer with a resin black matrix.

By forming the spacer 13 in contact with the top plate 10, the abnormal liquid crystal layer in the portion without the ITO pixel electrode 5 is not formed, and of course, light is prevented from leaking not only at the front but also at an oblique angle.                     

The process of the lower plate 11 among the liquid crystal display panel forming process as described above is as follows. If only the process of forming the spacer 13 on the data line 8 will be described as follows.

The gate wiring 12 is formed at the same time as the gate electrode 14 is formed.

Next, the insulating film 6 is formed to cover the gate electrode 14, and the semiconductor layer 15 is formed.

Subsequently, the ohmic contact layer 16 is formed for the ohmic contact of the semiconductor layer 15, and then the source electrode 17 and the drain electrode 18 are formed.

A data line 8 is formed on the insulating film 6 together with the source electrode 17 and the drain electrode 18 formed on the ohmic contact layer 16.

Subsequently, a passivation layer 7 is formed on the entire surface including the source / drain electrodes 17 and 18 and patterned to expose a predetermined region of the drain electrode 18 and to be connected to the exposed drain electrode 18. (5) is formed. In this case, the pixel electrode 5 may be formed before the passivation layer 7.

Subsequently, although not shown in the drawing, an alignment layer is formed, a spacer 13 is formed on the data line 8, and a color filter layer 3 is formed on the pixel electrode 5.

The spacer 13 is formed to extend to the upper plate 10 and the color filter layer 3 is formed on the lower plate 11 having the thin film transistor, so that the left and right viewing angles due to the misalignment of the upper plate 10 and the lower plate 11 are formed. There is no light leaking problem.                     

The liquid crystal layer formed between the color filter layer 3 and the ITO pixel electrode 5 transmits light incident from the polarizing plate formed on one side of the lower glass 9 to be applied to the pixel electrode 5 and the common electrode 4. The alignment direction is changed in accordance with the alignment direction of the alignment layer according to the voltage, and the transmitted light is selectively passed through the polarizer according to the alignment state of the liquid crystal layer.

At this time, since the formation of the abnormal liquid crystal layer is prevented by using the spacer 13 and no light passes through the lower glass 9 by the abnormal liquid crystal layer, interference between pixels is eliminated.

As described above, the liquid crystal display panel and its manufacturing method according to the present invention have the following effects.

In a structure in which a color filter layer is laminated on a lower plate of a liquid crystal display panel on which a thin film transistor array is formed, formation of an abnormal liquid crystal layer is prevented by forming spacers on the upper side of the data line or on the upper plate facing the data line as much as the space between the upper and lower plates.

Therefore, the light can be prevented from leaking in the left and right viewing angle directions due to the light transmission to the liquid crystal layer.

In addition, since the spacer also serves to block light, it is not necessary to form a separate black matrix, which has an effect of improving panel transmittance (opening ratio).

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 embodiments, but should be defined by the claims.

Claims (15)

A liquid crystal display panel in which a liquid crystal is injected between a first substrate having a plurality of data wirings and gate wirings formed to cross each other and a second substrate, A thin film transistor formed on an intersection of data and gate lines on the first substrate; A pixel electrode connected to the thin film transistor; A color filter layer formed on the pixel electrode; And a spacer formed by any one of a column spacer and a black matrix between the data line and the second substrate so as to be in contact with the data line and the second substrate. The method of claim 1, wherein the thin film transistor A gate electrode formed on the first substrate together with a gate wiring; A gate insulating film formed on the entire surface including the gate electrode; And a semiconductor layer, a source electrode, and a drain electrode sequentially formed in a predetermined region on the gate insulating film. The liquid crystal display panel of claim 1, wherein the spacer is formed on any one of an upper portion of the data line and the second substrate facing the data line. The liquid crystal display panel of claim 1, wherein the spacer is further formed between the gate line and the second substrate. The liquid crystal display panel of claim 1, wherein the spacers are formed such that a predetermined space is formed between the first and second substrates. delete The liquid crystal display panel as claimed in claim 1, wherein the black matrix and the column spacer are formed of a resin. A liquid crystal display panel manufacturing method in which a liquid crystal is injected between a first substrate having an active region composed of a plurality of unit pixels and a second substrate, Forming a plurality of gate wirings on the first substrate; Forming a thin film transistor per unit pixel of the active region, and forming a plurality of data lines in a direction crossing the plurality of gate lines; Forming a pixel electrode to be connected to the thin film transistor; Forming a spacer between any one of a column spacer and a black matrix between the data line and the second substrate so as to contact the data line and the second substrate; And forming a color filter layer on the pixel electrode. The method of claim 8, wherein the forming of the thin film transistor Forming a gate electrode on the first substrate when the gate wiring is formed; Forming a gate insulating film on an entire surface of the insulating substrate including the gate electrode; Forming a semiconductor layer on the gate insulating film; And forming a source electrode and a drain electrode on the semiconductor layer when the data wiring is formed on the gate insulating film. The method of claim 8, wherein the spacer And an upper portion of the data line and a second substrate facing the data line. The method of claim 8, wherein the spacer is further formed between the gate wiring and the second substrate. The method of claim 8, wherein the spacers are formed such that a constant space is formed between the first and second substrates. delete The method of claim 8, wherein the black matrix and the column spacer are formed of a resin. In the liquid crystal display panel manufacturing method in which a liquid crystal was injected between a 1st board | substrate and a 2nd board | substrate, Forming a gate wiring and a gate electrode on the first substrate; Forming a gate insulating film on an entire surface of the first substrate including the gate electrode; Forming a semiconductor layer on the gate insulating film; Forming a data line on the gate insulating layer and forming a source electrode and a drain electrode on the semiconductor layer to form a thin film transistor; Forming and patterning a protective film on the entire surface including the source electrode and the drain electrode to expose a predetermined region of the drain electrode; Forming a pixel electrode to be connected to the exposed drain electrode; Forming a spacer between any one of a column spacer and a black matrix between the data line and the second substrate so as to contact the data line and the second substrate; And forming a color filter layer on the pixel electrode.

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