KR100920345B1 - a liquid crystal display - Google Patents

Abstract

In the present invention, the red, blue, and green pixels are sequentially arranged in the row direction, and the red and green pixels are alternately arranged in the column direction, and the blue pixels are arranged in the same manner, so that the two pixels are adjacent to each other. Four neighboring red and green pixels are disposed to face each other with respect to two neighboring blue pixels. At this time, each pixel has a transmissive area for displaying an image using light that passes therethrough or a reflective area for displaying an image using reflected light.

 Pixels, transflective, reflective, transmissive

Description

Liquid crystal display {a liquid crystal display}

1 is a layout view illustrating a pixel structure of a liquid crystal display according to a first exemplary embodiment of the present invention.

2 and 3 are cross-sectional views of a thin film transistor array substrate for a liquid crystal display device taken along lines II-II 'and III-III' of FIG. 1,

4 is a layout view illustrating a structure of a connection unit in a thin film transistor array substrate for a liquid crystal display according to a second exemplary embodiment of the present invention.

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

6 is a layout view illustrating a pixel structure of a liquid crystal display according to a third exemplary embodiment of the present invention.

FIG. 7 is a cross-sectional view of the TFT array substrate for a liquid crystal display device taken along the line VII-VII ′ in FIG. 6.

8 to 10 are diagrams illustrating an inversion driving method and a connection structure of wirings of a liquid crystal display according to a fourth to sixth embodiments of the present invention;

11 and 12 illustrate column inversion driving and two dot inversion driving using a liquid crystal display according to a fifth exemplary embodiment of the present invention.

13 and 14 are plan views illustrating structures of data line cross connection portions in the liquid crystal display according to the fourth to sixth embodiments of the present invention.

15 is a plan view illustrating a data line connection unit and a data line cross connection unit in the thin film transistor substrate for liquid crystal display according to the fourth to sixth embodiments of the present invention.

16 is a layout view illustrating a structure of a liquid crystal display device having a pixel array structure according to a seventh embodiment of the present invention.

17 is a layout view illustrating a pixel structure of a liquid crystal display according to an eighth exemplary embodiment of the present invention.

FIG. 18 is a layout view illustrating a unit pixel structure of a transflective type liquid crystal display device having a pixel array structure according to a ninth embodiment of the present invention.

19 is a cross-sectional view taken along the line XIX-XIX ′ of FIG. 18;

20A to 20C are layout views illustrating a structure of a transflective liquid crystal display device having a pixel array structure according to a seventh embodiment of the present invention.

21A and 21B are layout views illustrating a structure of a transflective liquid crystal display device having a pixel array structure according to a first embodiment of the present invention.

22A to 22C are layout views illustrating a structure of a transflective liquid crystal display device having a pixel array structure according to a sixth embodiment of the present invention.

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a pixel array structure for displaying a high resolution image.

In general, a liquid crystal display device injects a liquid crystal material between two substrates having an electrode generating an electric field, and applies an electric potential different from each other to form an electric field to change the arrangement of liquid crystal molecules, thereby transmitting light. It is a device that expresses the image by adjusting.

The liquid crystal display has a pixel electrode and a plurality of pixels in which red, green, and blue color filters are formed, and the pixels are driven by signals applied through wirings. The wiring includes a scan signal line or a gate line for transmitting a scan signal, an image signal line or a data line for transferring an image signal, and each pixel includes a thin film transistor connected to one gate line and one data line. The image signal transmitted to the pixel electrode formed in the is controlled.

In this case, there are various methods of arranging red (R), green (G), and blue (B) color filters in each pixel. A stripe type array of color filters of the same color in pixel columns, and a mosaic array of color filters of red (R), green (G), and blue (B) in the column and row directions. And a delta type in which the unit pixels are arranged in a zigzag form to be staggered in a column direction, and color filters of red (R), green (G), and blue (B) are sequentially arranged. In the case of the delta type, three unit pixels including red (R), green (G), and blue (B) color filters are represented by a circle or a diagonal line when displaying an image with one dot. It has the ability to express well.                         

In addition, a pixel array structure capable of minimizing the design cost while providing a high resolution representation that is more advantageous when displaying an image is proposed. In such a pixel array structure, blue unit pixels are shared together when displaying two dots, and blue unit pixels adjacent to each other transmit data signals by one data driving integrated circuit and different gate driving integrated circuits. Driven by Using this pixel array structure, UXGA-class resolution can be realized by using an SVGA-class display device, and the number of low-cost gate driver integrated circuits is increased, but the number of relatively expensive data driver integrated circuits can be reduced. The design cost of the device can be minimized.

However, even in a liquid crystal display device having such a pixel arrangement, there is a limit to the application to a product in which a delay occurs severely for a specific signal line and the display characteristics become uneven. In addition, the holding capacitance required in the liquid crystal display device must be easily formed, and a short circuit of the wiring does not easily occur, and display characteristics should not be degraded due to interference between signal lines. In addition, in order to prevent deterioration of the liquid crystal, inversion driving should be performed. In order to prevent deterioration of image quality of the display device such as a luminance difference between flicker or pixel columns, the inversion driving should be easily performed.

Meanwhile. In order to display an image at a high resolution even in a liquid crystal display having such a pixel array, a pixel must be driven using a rendering technique, and the image is displayed by using an internal light source and a reflection type that displays the image using external light. It is preferable to apply also to a transflective type having a transmissive type.

An object of the present invention is to provide a liquid crystal display device having excellent display capability and capable of preventing a short circuit between signal lines of neighboring pixels.

In addition, another technical problem of the present invention is to provide a liquid crystal display device having excellent display capability and capable of stably securing a storage capacitance.

In addition, another technical problem of the present invention is to provide a liquid crystal display device having excellent display capability and minimizing the size of a substrate, and which can easily arrange a repair line for repairing a short circuit or disconnection of a wiring.

In addition, another technical problem of the present invention is to manufacture a liquid crystal display device capable of performing regular inversion driving.

In addition, another technical problem of the present invention is to provide a liquid crystal display device which can easily apply a rendering driving technique for displaying an image at a high resolution.

In addition, another technical problem of the present invention is to provide a semi-transmissive liquid crystal display which displays both a reflective and a transmissive display.

In order to achieve the above object, in the liquid crystal display according to the present invention, red, green, and green pixels are sequentially arranged in the row direction, red and green pixels are alternately arranged in the column direction, and the blue pixel is The blue pixels have one pixel array arranged at the center of the four neighboring red and green pixels. At this time, the pixel lines are arranged in the horizontal direction, and gate lines for transmitting scan signals or gate signals are formed in the pixels. In the longitudinal direction, data lines are disposed to be insulated from and intersect with the gate lines, and to transmit an image or data signal, and to be arranged with respect to the pixel columns. Each pixel includes a pixel electrode, and each pixel includes a thin film transistor including a gate electrode connected to a gate line, a source electrode connected to a data line, and a drain electrode connected to a pixel electrode. In this case, the blue pixel has a transmissive area for displaying an image by using transmitted light and a reflective area for displaying an image by using reflected light.

One of the two red and green pixels facing the blue pixel may be formed of a reflective region, the other may be formed of a transmissive region, and each of the red and green pixels may have a transmissive region and a reflective region.

In another liquid crystal display according to the present invention, red, blue, and green pixels are sequentially arranged in a row direction, red and green pixels are alternately arranged in a column direction, and blue pixels are arranged in the same manner. Four neighboring red and green pixels around two neighboring blue pixels in two neighboring pixel rows have a pixel array arranged to face each other. In this case, gate lines are formed to be transverse to the pixel rows in the horizontal direction and transmit scan signals or gate signals to the pixels, and are arranged insulated from and cross the gate lines in the vertical direction to transmit image or data signals, respectively. Arranged data lines are formed. Each pixel includes a pixel electrode, and a thin film transistor including a gate electrode connected to a gate line, a source electrode connected to a data line, and a drain electrode connected to a pixel electrode. At this time, each pixel is composed of a transmission area for displaying an image by using transmitted light or a reflection area for displaying an image by using reflected light.

Here, the transmission region and the reflection region may be alternately arranged in the row and column direction of the pixels, are alternately arranged with respect to the pixel row, are alternately arranged in the pixel row direction, and are arranged in the pixel column direction. The red and green pixels are identically arranged in units of two pixel rows, and may be alternately arranged in the blue pixels.

For the two pixel rows, the pixel electrodes of the blue pixels may be connected through the pixel electrode connection parts, and the pixel electrode connection parts may be alternately arranged with respect to the two pixel rows.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, area, plate, etc. is said to be "on" another part, this includes not only the other part "directly" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

A liquid crystal display according to an exemplary embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a layout view illustrating a pixel array structure of a liquid crystal display according to a first exemplary embodiment of the present invention, and FIGS. 2 and 3 are liquid crystals cut along lines II-II 'and III-III' of FIG. 1. It is sectional drawing of the thin film transistor substrate for display devices. 2 is a cross-sectional view illustrating in detail a pixel portion and a pad portion, and FIG. 3 is a connection portion C for connecting a data line transferring a data signal to two neighboring blue pixels B1 and B2 with one pad. Is a cross-sectional view showing in detail.

As shown in FIG. 1, in the liquid crystal display according to the first exemplary embodiment of the present invention, pixels for red, blue, and green color filters arranged in a matrix form (R, B1, G, R, B2, G, ... are formed. At this time, the red, blue, and green pixels (.R, B1, G, R, B2, G, ...) are sequentially and repeatedly arranged in the row direction, and the red (R) and blue (B1) columns are arranged in sequence. , B2) and green (G) pixels are arranged in a line, respectively. Here, the red pixels and the green pixels are arranged to form separate columns, but the red pixels R and the green pixels G may be alternately arranged in the same column. In this case, the red pixel R and the green pixel G are arranged on both sides of the same pixel row centering on the blue pixels B1 and B2. At this time, as shown in FIG. 1, in the horizontal direction, one gate line (or one scan signal line 121) for transmitting the scan signal or the gate signal is formed in the pixel row direction, one for each pixel row, and the vertical direction. The data line 171, which transmits a data signal and crosses the gate line 121a and defines a unit pixel, is insulated from the gate line 121a, so that each pixel (... R, B1, G, R, B2, G, ... is formed for every column. Here, the gate electrode 123 connected to the gate line 121a and the source electrode 173 and the gate electrode connected to the data line 171 are formed at the intersection of the gate line 121a and the data line 171. A thin film transistor including a drain electrode 175 and a semiconductor layer 154 formed opposite the source electrode 173 with respect to 123 is formed, and each pixel includes a gate line 121a through the thin film transistor. ) And a pixel electrode 190 electrically connected to the data line 171. In this case, the pixel electrodes 190 formed in the two adjacent blue pixels B1 and B2 are connected to each other through the first and second pixel electrode connectors 901 and 902 that are alternately formed with respect to the pixel column. In the blue pixels B1 and B2 having the pixel electrode 190, thin film transistors are alternately arranged with respect to two pixel rows. That is, thin film transistors are formed in odd-numbered pixels of pixels in column B1, and thin film transistors are formed in even-numbered pixels in column B2. Here, the first and second pixel electrode connectors 901 and 902 are disposed to overlap the same gate line 121a, but the first pixel electrode connector 901 overlaps the odd-numbered gate lines and the second pixel electrode connector. 902 may be disposed to overlap the even-numbered gate line, and in this case, both the first and second pixel electrode connectors 901 and 902 may overlap with the gate line that transmits the scan signal to the magnetic pixel. have.                     

At this time, each pixel area has a rectangular shape, and the ratio of length to width is 2: 3. This is due to the fact that two blue pixels alternately display a single dot (dot) in combination with the red and green pixel pairs respectively disposed on the left and right sides thereof.

Next, the structure of the thin film transistor substrate of the liquid crystal display according to the first embodiment of the present invention having the pixel array structure will be described in more detail with reference to FIGS. 1 to 3.

First, as shown in FIGS. 1 to 3, in a thin film transistor array substrate for a liquid crystal display according to a first embodiment of the present invention, aluminum, aluminum alloy, molybdenum on the insulating substrate 110 is provided. A gate wiring including a metal or a conductor such as (Mo), chromium (Cr), tantalum (Ta) or silver or silver alloy (Au Alloy) is formed. The gate wiring is a gate connecting the scan signal lines or gate lines 121a and 121b extending in the horizontal direction, the gate electrode 123 of the thin film transistor that is part of the gate line 121a, and the double gate lines 121a and 121b. It is connected to the end of the line connecting portion 127 and the gate line 121a includes a gate pad 125 for receiving a scan signal from the outside to transfer to the gate line 121a. The gate wirings 121a, 121b, 123, 125, and 127 overlap with the pixel electrodes 190 of neighboring pixel rows, which will be described later, to form a storage capacitor having a storage capacitor for improving charge storage capability of the pixel. In this case, when the storage capacitor is not sufficient, the storage capacitor wiring may be separately formed on the same layer as the gate wirings 121a, 121b, 123, 125, and 127 to overlap the pixel electrode 190 to be described later. On the other hand, the first data for connecting the data line 171 of the column of blue pixels B1 and B2 adjacent to each other on the same layer as the gate wirings 121a, 121b, 123, 125, and 127 to one data pad 179. Pad connection portions 122 are formed in the C portion outside the display area D with respect to the blue pixel column, respectively. Here, the display area D refers to an area in which an image is displayed and is composed of a set of red, blue, and green pixels (. R, B1, G, R, B2, G, ...).

The gate wirings 121a, 121b, 123, 125, and 127 may be formed as a single layer, but may also be formed as a double layer or a triple layer. In the case of forming more than two layers, it is preferable that one layer is formed of a material having a low resistance and the other layer is formed of a material having good contact properties with other materials, and a double layer of Cr / Al (or Al alloy) or Bilayers are an example.

A gate insulating layer 140 made of silicon nitride (SiN _x ) is formed on the gate wires 121a, 121b, 123, 125, and 127 and the data pad connection part 122 to form the gate wires 121a, 121b, 123, 125, and 127. ) And the data pad connector 122.

A semiconductor layer 154 made of a semiconductor such as hydrogenated amorphous silicon is formed on the gate insulating layer 140, and is heavily doped with n-type impurities such as phosphorus (P) on the semiconductor layer 154. An ohmic contact layer or intermediate layers 163 and 165 made of amorphous silicon are formed.                     

On the contact layers 163 and 165, data wirings including conductive materials such as Al or Al alloys, Mo or MoW alloys, Cr, Ta, Cu or Cu alloys are formed. The data line is connected to one end of the data line 171 formed in the vertical direction, the source electrode 173 and the data line 171 of the thin film transistor connected to the data line 171 to apply an image signal from the outside. A data line portion formed of a receiving data pad 179 and separated from the data line portions 171, 173, and 179, and the source electrode 173 of the gate electrode 123 or the semiconductor layer 154 of the thin film transistor. A drain electrode 175 of the thin film transistor positioned on the opposite side is included. In this case, the data lines 171 of the columns of the blue pixels B1 and B2 adjacent to each other have a second data pad connection portion 172 protruding wider than other portions at the end thereof, and the first data pad connection portion 122 ) Is disposed adjacent to the second data pad connector 172.

The data wires 171, 173, 175, and 179 and the second data pad connection portion 172 may also be formed as a single layer like the gate wires 121a, 121b, 123, 125, and 127, but may be formed as a double layer or a triple layer. May be Of course, when forming more than two layers, it is preferable that one layer is made of a material having a low resistance and the other layer is made of a material having good contact properties with other materials.

The contact layers 163 and 165 lower the contact resistance between the semiconductor layer 154 thereunder and the source electrode 173 and the drain electrode 175 thereon.

A passivation layer 180 made of silicon nitride is formed on the data lines 171, 173, 175, and 179 and the semiconductor layer 154 not covered by the data line, and the passivation layer 180 includes a drain electrode 175 and a data pad. Each of the contact holes 181 and 183 exposing 179 is exposed, and the contact hole 182 exposing the gate pad 125 is provided together with the gate insulating layer 140. In addition, the passivation layer 180 includes a contact hole 184 exposing the second data pad connection part 172 and a contact hole 185 exposing the first data pad connection part 122 together with the gate insulating layer 140.

A pixel electrode 190 is formed on the passivation layer 180 to receive an image signal from the thin film transistor and generate an electric field together with the common electrode of the upper plate. The pixel electrode 190 is made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO), and the drain electrode 175 of the thin film transistor formed in the adjacent pixel row through the contact hole 181. ) Is connected physically and electrically to receive an image signal. The pixel electrode 190 overlaps the gate wirings 121a, 121b, 123, 125, and 127 of the front end that transmit the scan signal to the thin film transistors formed in the adjacent pixel rows at the front end to form the storage capacitor. However, in the case where the holding capacitance is not sufficient, the holding wiring may be separately formed to ensure sufficient holding capacitance. In this case, the pixel electrodes 190 of the neighboring blue pixel rows B1 and B2 are connected through the first and second pixel electrode connectors 901 and 902, respectively, and the blue pixels B1 and B2 are connected to each other. The pixel electrode 190 is connected to thin film transistors that are alternately arranged one by one in a neighboring blue pixel column with respect to two pixel rows. Therefore, in the portion B, the second pixel electrode connector 902 overlaps the previous gate lines 121a and 121b, but the pixel electrode 190 of the other blue pixel B1 of the two neighboring blue pixels B1 and B2 is adjacent. The first pixel electrode connector 901 connecting the N-th electrode overlaps its gate line 121a which transmits the gate signal to the pixels of the corresponding row as shown in part A. FIG. As a result, a parasitic capacitance formed by overlapping the first pixel electrode connection part 901 and the gate line 121a is formed, which acts as a cause of the kickback voltage that lowers the pixel voltage applied to the corresponding pixel electrode 190. As a result, a luminance difference between neighboring blue pixel columns occurs. In order to minimize this problem, in the structure according to the first embodiment in which the storage capacitor is formed through the superposition of the gate wirings 121a, 121b, 123, 125, and 127 and the pixel electrode 190, the storage capacitor is reduced. The parasitic capacitance formed by overlapping the first pixel electrode connection portion 901 and its gate line 121a in the portion A is 5 to the sum of the liquid crystal capacitance and the storage capacitance of the corresponding pixel. It is required to optimize the area where the first pixel electrode connection part 901 and the gate line 121a overlap with each other so as not to exceed%. When the parasitic capacitance between the first pixel electrode connection portion 901 and the gate line 121a exceeds 5% with respect to the sum of the liquid crystal capacitance and the storage capacitance of the corresponding pixel, the kickback voltage increases by about 1 Volt or more. The difference in luminance between the pixels appears to be severe. Meanwhile, an auxiliary gate pad 95 connected to the gate pad 125 and the data pad 179 through the contact holes 182 and 183 of the passivation layer 180 and the gate insulating layer 140 on the same layer as the pixel electrode 190. ) And auxiliary data pads 97, and whether or not they are applied is optional. In addition, a third data pad connection part for electrically connecting a data line 171 that transmits a data signal to two adjacent blue pixel columns B1 and B2 to one data pad 179 on the same layer as the pixel electrode 190. 903 is formed. At this time, the two second data pad connection portions 172 and the first data pad connection portions 122 adjacent thereto are connected to the data lines 171 which transmit data signals to two neighboring blue pixels B1 and B2 columns. It is connected to the third data pad connection portion 903 through exposed contact holes 184 and 185, which are insulated from and intersect with data lines of neighboring red and green pixels G and G, and two data lines of neighboring blue pixels. 171 is electrically connected to one data pad 179. At this time, the contact hole 184 by connecting the data line 171 of the neighboring blue pixels B1 and B2 to one data pad 179 using the first to second data pad connection parts 122, 172, and 903. , A load resistance may be added when the data signal is transmitted due to the contact resistance of the contact portion including the contact hole 185 and the wiring resistance of the first to third data pad connectors 122, 172, and 903. In this case, it is preferable to design the connection unit such that the additional load resistance generated by adding the connection unit does not exceed 20% of the total load resistance of the data line 171. If the additional load resistance caused by the addition of such a connection exceeds 20% of the total load resistance of the data line 171, the charging capacity of the pixel is reduced by 5% or more, which is a display characteristic when displaying an image. Will lower.

Meanwhile, in the structures of FIGS. 1 to 3, the third data pad connection part of the same layer as the pixel electrode 190 is connected to the connection part for connecting the data line for transmitting the data signal to the two blue pixels B1 and B2 with one pad. Although 903 is used, only the second data pad connection portion may be used. This will be described in detail with reference to FIGS. 4 and 5.                     

FIG. 4 is a connection part for connecting a data line for transmitting a data signal to two neighboring blue pixels B1 and B2 with one pad in the structure of a thin film transistor array substrate for a liquid crystal display according to a second exemplary embodiment of the present invention. 5 is a cross-sectional view taken along the line VV ′ of FIG. 4. Here, since most of the structure is the same as in the first embodiment, detailed drawings will be omitted.

As shown in FIGS. 4 and 5, two first data pad connectors 122 for connecting the data lines 171 of two neighboring blue pixels are connected to each other through a connection pattern 124. The insulating layer 140 has contact holes 141 exposing two first data pad connectors 122, respectively. In this case, the two data lines 171 that transmit data signals to two neighboring blue pixels have a second data pad connector 172 connected to each other to the first data pad connector 122 through the contact hole 141. They are electrically connected to each other.

Herein, a thin film transistor substrate for a liquid crystal display device of a transmissive mode using transparent ITO or IZO is used as an example of the material of the pixel electrode 190. However, the pixel electrode 190 is made of aluminum or an aluminum alloy, silver or silver alloy having reflectivity. Likewise, it may be formed of a conductive material having reflectivity.

In the structure according to the embodiment of the present invention, it can be easily applied when displaying a circle or diagonal image to facilitate the expression of letters and figures, so that the resolution of UXGA level can be realized only with the SVGA class pixel array. At the same time, the number of data pads 179 can be reduced, thereby reducing the number of expensive data driving integrated circuits, thereby minimizing the design cost of the display device. In addition, since the data line which transmits a signal to the blue unit pixel is formed in the same shape as other data lines which transmit a signal to the red and green unit pixels, the display characteristics can be prevented from being uneven. In addition, the storage capacitance can be secured through the overlapping of the gate line and the pixel electrode at the front end, and the parasitic capacitance generated by the overlapping of the gate line and the pixel electrode connection part of the front end can be optimized to uniformly form the storage capacitance. In addition, data lines for transmitting data signals to red or green pixels are arranged with unit pixels interposed therebetween, whereby short circuits of neighboring data lines can be prevented. In addition, since the adjacent blue pixels are driven using one driving integrated circuit, the size of the display device can be optimized, and a repair line for repairing disconnection or short circuit of the wiring can be easily formed around the display area. Can be.

In FIGS. 1 and 3, the structure in which the front gate line and the pixel electrode overlap each other to form a storage capacitor is described. However, referring to FIGS. 6 and 7, a separate storage capacitor wiring line is illustrated to form the storage capacitor. The structure of the thin film transistor substrate for a liquid crystal display according to the third embodiment of the present invention will be described in detail.

FIG. 6 is a layout view of a liquid crystal display according to a third exemplary embodiment of the present invention, and FIG. 7 is a cross-sectional view of a thin film transistor array substrate for a liquid crystal display, taken along the line VII-VII ′ in FIG. 6.

As shown in FIG. 6, the thin film transistor array substrate for a liquid crystal display according to the third embodiment of the present invention includes red, blue, and green color filter pixels (… R, B1, G, R, B2, G, ...) are arranged. At this time, as in the first embodiment, red, blue, and green pixels (... R, B1, G, R, B2, G, ...) are sequentially arranged in the row direction, and neighboring rows in the column direction. Red, green, and blue pixels (... R, B1, G, R, B2, G, ...) are arranged in the same direction. However, the difference from the first embodiment is that the blue pixels B1 and B2 have a rhombus shape, and two rows of pixels R and G adjacent to each other between two adjacent red and green pixels R and G columns and The red and green pixels R and G arranged in the center of four green and blue (G and B) one by one with respect to the blue pixels B1 and B2 are arranged in a rhombus-shaped blue pixel. It is arranged so as to face each of the four sides of (B1, B2). At this time, as shown in Fig. 1, in the horizontal direction, a gate line (or a gate line for transmitting a scan signal or a gate signal to a row of red, blue, and green pixels (R, B1, G, R, B2, G, ...) One scanning signal line 221, 222 is formed for each pixel row, and data signals are arranged in columns of red, blue, and green pixels (‥ R, B1, G, R, B2, G, ...) in the vertical direction. The transferred data lines (171R, 171B1, 171G, 171R, 171B2, 171G, ...) are insulated from and intersected with the gate lines 121, 122, and the pixels (‥ R, B1, G, R, B2, G, ...) It is formed with respect to the column direction of respectively. In addition, the pixel electrode to which an image signal is transmitted to each pixel (... R, B1, G, R, B2, G, ...) via data lines ... 171R, 171B1, 171G, 171R, 171B2, 171G, ... ... 190R, 190B1, 190G, 190R, 190B2, 190G, ... are formed. Further, in the column direction of the pixels, the first wirings 131 and 132 for the storage capacitors, which overlap with the pixel electrodes ‥ 190R, 190B1, 190G, 190R, 190B2, 190G, ..., form a storage capacitor and extend in the horizontal direction. And storage capacitor wirings including the storage capacitor second wirings 135, 134, and 133 extending along the sides of the pixel electrodes 190B1 and 190B2 of the blue pixel. Here, each pixel also includes gate lines 121 and 122, data lines 171R, 171B1, 171G, 171R, 171B2, 171G, and pixel electrodes 190R, 190B1, 190G, 190R, 190B2, 190G, ... ), A thin film transistor including a gate electrode 123, a source electrode 173, and a drain electrode 175 connected to each other is disposed.

More specifically, in the thin film transistor substrate for a liquid crystal display according to the third embodiment of the present invention, gate wiring and sustain wiring are alternately formed on the transparent insulating substrate 10. The gate wiring includes a scan signal line or gate lines 121 and 122 extending in the horizontal direction and a gate electrode 123 of a thin film transistor that is part of the gate line 121. As in the first embodiment, the gate line 121, 122 may include gate pads connected to each end. In this case, the gate electrode 123 connected to one gate line 121 is formed only in the blue pixel B1 column, and the gate electrode 123 connected to the other gate line 122 is the blue pixel B2. It is formed only in heat. The storage wiring extends in the horizontal direction and is connected to the storage capacitor first wirings 131 and 132 and the storage capacitance first wirings 131 and 132 which are alternately formed with the gate lines 121 and 122, respectively. And the second wirings 135, 134, and 133 for storage capacitors extending to the boundary of blue and green pixels (... R, B1, G, R, B2, G, ...). The sustain wirings 131, 131, 133, 134, and 135 are formed of pixel electrodes (190R, 190B1, 190G, 190R, 190B2, 190G, ...) of the pixels (... R, B1, G, R, B2, G, ...) to be described later. And superimposed on each of them to form a storage capacitor having a storage capacitor for improving the charge storage capability of the pixel. At this time, the two gate lines 121 and 122 which are adjacent to each other are formed to be spaced apart from both sides of the first wirings 131 and 132 for the storage capacitance, thereby preventing a short circuit of the gate wirings.

A data line made of a low resistance conductive material is formed on the gate insulating layer 14 covering the gate lines 121, 122, 123 and the sustain lines 131, 132, 133, 134, and 135. The data wires are formed in the vertical direction and are arranged one by one in pixel units of red, blue, and green pixels (... R, B1, G, R, B2, G, ...), and the data lines (171R, 171B1, 171G, and 171R). 171B2, 171G, ..., a thin film transistor positioned opposite to the source electrode 173 with respect to the source electrode 173 and the gate electrode 123 or the semiconductor layer 150 of the thin film transistor connected thereto. And a data pad connected to one end of the data line 171 to receive an image signal from the outside. At this time, the data line 171R of the red pixel R column is formed at the boundary between the red and green pixels R and G, while the data lines 171B1 and 171B2 of the blue pixel B1 and B2 columns are red and blue pixels. It is formed across the center of the column, and the data line 171G of the green pixel (G) column is also formed across the center of the green pixel column, so that the data lines (‥ 171R, 171B1, 171G, 171R, 171B2, 171G, ... are spaced apart from each other to prevent short circuit between the data lines (171R, 171B1, 171G, 171R, 171B2, 171G, ...), and It is possible to prevent indirect between data signals transmitted to,.

A protective film 180 made of an organic insulating material such as silicon nitride or acrylic is formed on the data wirings (171R, 171B1, 171G, 171R, 171B2, 171G, ...) and the semiconductor layer 150 not covered therefrom. In the upper portion of the passivation layer 180, pixel electrodes (190R, 190B1, 190G, 190R, 190B2, 190G, ...), which are connected to the drain electrode 175 through the contact hole 185, each pixel (. B1, G, R, B2, G, ... are formed along the pixel shape.

Of course, even in the structure according to the third embodiment of the present invention, the structure of the data pad connection unit for connecting the data lines to one data pad based on two neighboring blue pixels provided in the first embodiment may be applied in the same manner. The data pad connection unit may be similarly applied to a conventional fan tile structure.

The thin film transistor substrate for a liquid crystal display according to the third exemplary embodiment of the present invention has a structure for securing a storage capacitance by using a storage wiring, and transmits gate and data signals to pixel rows and columns adjacent to the same with excellent display characteristics. Signal lines are spaced at regular intervals to prevent short circuits. In addition, the data line is formed to an optimal length across the center of the pixel, so that the delay of the signal transmitted through the data line can be made uniform. On the other hand, in such a structure, the signal line is formed to cross the center of the pixel, so that the pixel electrodes (‥ 191R, 191B1, 191G, 191R, 191B2, 191G, ‥) are formed as a reflective film of a conductive material having a reflectivity, thereby reflecting a liquid crystal display. It is advantageous to apply to the device. At this time, the passivation layer 180 between the data wires (... 171R, 171B1, 171G, 171R, 171B2, 171G, ...) and the pixel electrodes (... 190R, 190B1, 190G, 190R, 190B2, 190G, ...) has a low dielectric constant. It is desirable to ensure a sufficient wiring between layers made of an organic insulating material. In this case, the surface of the passivation layer 180 may be formed to have irregularities in order to increase the reflectance of the reflecting layer, and the passivation layer 180 is adopted as an insulating layer having a low reflectance and transmittance with respect to incident light and leaks between neighboring pixels. Blocking the light or blocking the light incident to the semiconductor layer 150 of the thin film transistor may impart a black matrix function, and change the shape of the gate wiring, data wiring and sustain wiring to leak between pixels. It can also be used as a black matrix to block out light.

Next, a method of driving the liquid crystal display of such a structure will be described.

In the driving method of the liquid crystal display device, in order to prevent deterioration of the liquid crystal, an image signal transmitted to the pixel electrode is driven to be repeated positively and negatively with respect to the common electrode. Such a driving method is called an inversion driving method. In this case, when the inverted polarity of the pixel is driven irregularly, the image signal transmitted to the pixel electrode is severely distorted to generate flicker, which causes a problem of deterioration in image quality of the liquid crystal display. In order to solve this problem, in a pixel array structure in which red, blue, and green pixel columns are sequentially arranged according to an exemplary embodiment of the present invention, one pad includes data lines of a first or second neighboring blue pixel column. The data signals of the red and green pixel columns that are adjacent to each other between the data lines of the blue pixel columns connected to one pad at the same time are connected to each other to transfer an image signal. This will be described in detail with reference to the drawings.

8 to 10 are diagrams illustrating an inversion driving of the liquid crystal display according to the fourth to sixth embodiments of the present invention and a connection structure of wirings therefor. Here, the display "??" indicates the position of the thin film transistor in the blue pixels arranged in the column direction, and "+" and "-" indicate pixel voltages (image signals applied to the pixel electrode with respect to the common voltage of the common electrode). ) Polarity.

8 to 10, in the liquid crystal display according to the fourth to sixth embodiments of the present invention, red, green, and blue pixels R, G, and B are sequentially arranged in the row direction. In the column direction, red and green pixels G and R are alternately arranged, and blue pixels B are arranged one by one for two rows of pixels between neighboring red and green pixels G and R columns. Four pixels, red and green, which are adjacent to the blue pixel B, are disposed facing the blue pixel B as a center.

As shown in FIG. 8, in the liquid crystal display according to the fourth exemplary embodiment, when the twelve pixel column is a unit, the data line 171 of the n + 4th blue pixel column is the data of the n + 1th blue pixel column. The n + 4th blue pixel column is electrically connected to the line 171 to receive an image signal through a data pad connected to the n + 1th data line 171, and the n + 7th blue pixel column The data line 171 is electrically connected to the data line 171 of the n + 10th blue pixel column, and the n + 7th blue pixel column is connected to the data line 171 connected to the n + 10th data line 171. Receive an image signal. Further, the data line 171 of the n + 5th green pixel column and the data line 171 of the n + 6th red pixel column cross each other so that the n + 6th green pixel column and the n + 5th red pixel are respectively crossed. Transfer the image signal to the heat.                     

When the liquid crystal display having such a connection structure is driven with dot inversion in the column and row directions, as shown in Fig. 8, in the row direction of the pixels with respect to the entire liquid crystal panel, ..., +++, ---, +-+ The inversion drive can be performed while having regularity of-,-+-and.

As shown in FIG. 9, in the liquid crystal display according to the fifth exemplary embodiment, the data line 171 of the n + 7th blue pixel column is electrically connected to the data line 171 of the n + 1th blue pixel column. The n + 7th blue pixel column receives an image signal through a data pad connected to the n + 1th data line 171, and the data line 171 of the n + 10th blue pixel column receives n + 4. Since the n + 10th blue pixel column is electrically connected to the data line 171 of the first blue pixel column, the image signal is transmitted through the data pad connected to the n + 4th data line 171. In addition, the data line 171 of the n + 8th green pixel column and the data line 171 of the n + 9th red pixel column cross each other, respectively, to the n + 9th green pixel column and the n + 8th red pixel column. Pass the image signal.

When the liquid crystal display according to the fifth embodiment having such a connection structure is driven with dot inversion in the column and row directions, as shown in FIG. 7, in the pixel row direction with respect to the entire liquid crystal panel, ..., +++,- Reverse driving can be performed with regularity of +-, ....

As shown in FIG. 10, in the liquid crystal display according to the sixth exemplary embodiment, the data line 171 of the n + 10 th blue pixel column is electrically connected to the data line 171 of the n + 1 th blue pixel column. The n + 10th blue pixel column receives an image signal through a data pad connected to the n + 1th data line 171, and the data line 171 of the n + 7th blue pixel column receives n + 4. The n + 7th blue pixel column is electrically connected to the data line 171 of the first blue pixel column and receives an image signal through a data pad connected to the n + 4th data line 171. In addition, the data line 171 of the n + 8th green pixel column and the data line 171 of the n + 9th red pixel column cross each other, respectively, to the n + 9th green pixel column and the n + 8th red pixel column. Pass the image signal.

When the liquid crystal display device having such a connection structure is driven with dot inversion in the column and row directions, as shown in FIG. 10, in the row direction of the pixels with respect to the entire liquid crystal panel, ..., +++,-+-, +-+ Reverse driving can be performed with regularity.

Here, in the driving method of the liquid crystal display according to the sixth embodiment of the present invention, when driving in the dot inversion method, inversion driving can be performed with regularities of +++ and-+-in the row direction of the pixels. However, flicker may occur due to the inversion of the frame in the column direction with respect to the blue pixel column. In order to solve this problem, column inversion driving is performed or two dot inversion is performed in the column direction.

11 and 12 illustrate a column inversion driving and a two dot inversion driving of a liquid crystal display according to a fifth exemplary embodiment of the present invention.

As shown in FIG. 11, in the method of driving the liquid crystal display according to the fifth embodiment of the present invention, when the column inversion is performed in the row direction, the blue pixel column is also driven by the color inversion in the row direction to improve display characteristics. You can.

As shown in Fig. 12, when two dot inversion driving is performed in the column direction, the blue pixel can realize uniform dot inversion in the column direction and the row direction.

On the other hand, in the foregoing fourth to sixth embodiments, when the data lines 171 cross each other in order to cross-transfer image signals to red and green pixel columns that are adjacent to each other (see the first and second embodiments). ), Gate wirings (see the first and second embodiments) and pixel electrodes (see the first and second embodiments) are preferably formed in the same layer as the data line crossing wirings. It will be described in detail.

13 and 14 are plan views illustrating data line cross connection portions in the liquid crystal display according to the fourth to sixth embodiments of the present invention. Here, reference numeral 124 denotes a first crossing wiring formed of the same layer as the gate wiring, reference numerals 710 and 720 denote second crossing wiring formed of the same layer as the data wiring, and reference numeral 720 denotes a pixel electrode. It is the 3rd crossing wiring formed in the same layer as this.

As shown in FIG. 13, n + 5 and n + 6 or n + for transmitting an image signal to a red and green pixel column on the thin film transistor array substrate for a liquid crystal display according to the fourth to sixth embodiments of the present invention. The eighth or n + 9th data lines 171 are formed parallel to each other, and the data pads 179 are connected to each data line 171 by crossing each other. Here, the second cross wiring 710 is bent to electrically connect the n + 6 and n + 9th data pads 179 to the n + 5 and n + 8th data lines 171, respectively. The first cross wiring 124 and the third cross wiring 720 are connected to the n + 6 and n + 9th data lines 171 to the n + 5 and n + 8th data pads 179, respectively. . In this case, the first crossing wiring 124 is formed of the same layer as the gate wiring and bent to intersect the second crossing wiring 710, and the third crossing wiring 720 is referred to as the gate insulating layer 140 (see FIG. 2). ) Or the first intersecting wiring 124 and the data line 171 are electrically connected through the contact hole 910 formed in the passivation layer 180 (see FIG. 2).

FIG. 14 is a structure in which the second crossing wire 710 of FIG. 11 is changed like the first crossing wire 124 in order to make the contact resistance of the data line cross connection part uniform. As shown in FIG. 12, the second crossing wires 710 are adjacent to the data line (via the contact hole 910 formed in the gate insulating layer 140 (see FIG. 2) or the passivation layer 180 (see FIG. 2)). The third cross wires 720 connected to the 171 and the data pads 179 are connected to each other.

In addition, the data line which transmits an image signal to the red and green pixel columns and has a data line cross connection part has a contact portion between the first, second or third cross wires, and thus has a difference compared with the line resistance of other data lines. This may adversely affect the display characteristics of the liquid crystal display. As a method of improving such a problem, the line resistance variation of the entire data line should be minimized. For this purpose, it is preferable to form a connection portion in each data line, which will be described in detail with reference to FIG. 15.

FIG. 15 is a plan view illustrating a data line connection unit and a data line cross connection unit in the thin film transistor substrate for liquid crystal display according to the fourth to sixth exemplary embodiments.

As shown in FIG. 15, each data line 171 has a first connection wiring 126 formed of the same layer as the gate wiring and a second connection wiring 720 formed of the same layer as the pixel electrode. It is connected to the data pad 179 through.

In such a structure, the plurality of data lines 171 are connected to the data pads through two contact parts, respectively, to have uniform line resistance, thereby preventing the characteristics of the display device from being uneven.

Meanwhile, in order to express a high resolution image through the liquid crystal display having the pixel array structure according to the embodiment of the present invention described above, a rendering driving technique should be implemented. The rendering driving technique drives red, green, and blue pixels individually when displaying an image, and simultaneously drives pixels located around the pixels to be driven together to disperse the surrounding pixels and the brightness. It is a technology that expresses diagonal lines or curves more delicately and at the same time increases the resolution. However, a black matrix is formed between each pixel to block the light leaking between the pixels, and since the black matrix is always displayed in black, the area of the black matrix is determined by the rendering technique. The brightness cannot be adjusted, resulting in a phase error. To solve this problem, the width of the black matrix should be minimized to minimize the area occupied by the black matrix between pixels. To this end, the pixel electrodes 190, 190R, 190G, 190B1, 190B2 (see FIGS. 1 and 6) are formed to the maximum size in the unit pixel, and the edges of the pixel electrodes are formed on the gate line 121 and the data line 171. It is preferable to form so that and the edge portion overlap. In this case, in the structure of FIG. 1, the gate line 121 may be formed of only one wire, and the gate line connection part 127 may be omitted, and as shown in FIG. 2, an additional storage capacitor wire may be added. However, when the pixel electrodes 190, 190R, 190G, 190B1, 190B2 (see FIGS. 1 and 6) and the data line 190 overlap with each other, parasitic capacitance may be formed through the passivation layer 180 formed therebetween. As a result, the data signal transmitted through the data line 171 may be distorted. In order to solve this problem, the passivation layer 180 is formed of an organic insulating material such as acryl-based material having excellent low planarity and excellent planarization property or a chemical vapor deposition method, and has a low dielectric constant insulating material having a low dielectric constant of 4.0 or less, such as SiOC or SiOF. The passivation layer 180 should be formed. In this way, the size of the pixel electrodes 190, 190R, 190G, 190B1, 190B2 (see FIGS. 1 and 6) in the pixel can be maximized to ensure a high opening ratio, and to block light leakage between the pixels. The width of the black matrix can be minimized. By minimizing the area of the black matrix, the luminance can be increased to improve the color reproducibility, so that the rendering drive can be performed more delicately.

Meanwhile, in the structure of the thin film transistor array substrate for liquid crystal display devices according to the first to sixth embodiments, the pixel electrodes of the blue pixels of neighboring pixel rows are connected or the data lines of the neighboring blue pixels are connected to one pad or inverted. Various wiring structures or connection structures of wirings have been proposed for driving, but in order to easily perform reverse driving or rendering driving, or to simplify the structure of data wiring, a data pad may be connected to each data line to transfer data signals. It may be. This will be described in detail with reference to the drawings.

16 is a layout view illustrating a structure of a liquid crystal display device having a pixel array structure according to a seventh embodiment of the present invention. Here, most of the cross-sectional structure or pad structure is the same as the structure of the first to third embodiments of the present invention, the description of the cross-sectional structure will be omitted, and only the arrangement structure will be described in detail.

As shown in FIG. 16, in the liquid crystal display device having the pixel arrangement according to the seventh embodiment of the present invention, pixels for red, blue, and green color filters arranged in a matrix form (.. R, B, G, ...) Are formed. At this time, red, blue, and green pixels (... R, B, G, ...) are sequentially arranged in the row direction, and red, green pixels (... R, G, ...) are alternately arranged in the column direction. It is divided into a column which consists only of a column arrange | positioned and a blue pixel (B). In the same pixel row, both the red pixel R and the green pixel G are disposed on both sides of the blue pixel B as a center. In this case, as shown in FIG. 16, a gate line (or a scan signal line 121) for transmitting a scan signal or a gate signal is formed in the horizontal direction, one for each pixel row in the pixel row direction, and in the vertical direction. The data line 171 which transmits a data signal and crosses the gate line 121 and defines a unit pixel is formed for each pixel column (R, B, G, ...).

At this time, each pixel area has a rectangular shape, and the ratio of length to width is 2: 3. This is due to the fact that two blue pixels alternately display a single dot (dot) in combination with the red and green pixel pairs respectively disposed on the left and right sides thereof.

Also, unlike the first to sixth embodiments, the liquid crystal display according to the seventh embodiment of the present invention has the same arrangement structure as that of the red and green pixels. That is, the gate electrode 123 connected to the gate line 121, the source electrode 173 connected to the data line 171, and the gate electrode at a portion where the gate line 121 and the data line 171 cross each other. A thin film transistor including a drain electrode 175 and a semiconductor layer 154 formed opposite to the source electrode 173 is formed with respect to 123, and each blue pixel includes a gate line through the thin film transistor. Pixel electrodes 190 electrically connected to the 121 and the data lines 171 are formed, respectively. In addition, unlike the first and second embodiments, the storage electrode line 131 is formed in the horizontal direction to overlap the pixel electrode 190 in the same layer as the gate line 121 to form the storage capacitor. In addition, a contact hole 181 of the passivation layer 180 (see FIGS. 1 and 2) for connecting the pixel electrode 190 and the data line is formed on the drain electrode 173, and ends of each data line 171 are provided. Data pads 179 for receiving an image signal from the outside and transmitting the image signal to the data line 171 are connected to each other. In this structure, the data line 171 for transmitting the data signal to the blue pixel B column receives the data signal through the respective data pads 179 to easily perform the inversion driving. As in the example, it is not necessary to have a complicated wiring structure in order to perform the inversion driving, and the data wiring does not need to have the data line connection part and the data line cross connection part for the inversion drive, thereby ensuring the line resistance of the wiring evenly throughout the board. can do. In addition, the data line 175 of the blue pixel B may be connected to each of the data pads 179 to receive an image signal, thereby facilitating the driving of rendering, and the effects of the first to third embodiments. Have together

In this case, since the blue pixel has a small effect on the resolution when rendering driving is performed, the pixel voltage is applied only to the red pixel and the green pixel. As shown in the fourth to tenth embodiments, the red or green pixel is a blue pixel. It is arranged irregularly and has an asymmetrical structure up, down, left and right. For this reason, the center of the pixel on which the image is displayed and the center of the pixel set for the driving of the rendering are distorted, resulting in a phase error. That is, since blue pixels have little effect on the resolution, the pixel voltage applied to the red or green pixel is applied under the condition that the blue pixel area is ignored during the driving operation. The center of the pixel on which the image is displayed and the center of the pixel during the driving of the rendering are distorted, resulting in a phase error. In order to solve this problem, it is preferable to reduce the area occupied by the blue pixel by forming the area of the blue pixel smaller than the area of the red and green pixels. This will be described in detail with reference to the drawings.

17 is a layout view illustrating a structure of a thin film transistor array substrate for a liquid crystal display according to the eighth embodiment of the present invention.                     

As shown in Fig. 17, most structures are the same as in the seventh embodiment.

However, the area of the blue pixel B is smaller than the area of the red and green pixels R and G. Specifically, the width of the blue pixel B is smaller than the width of the red and green pixels R and G. In the structure according to the present invention, the area occupied by the blue pixel B is substantially smaller, and thus the red and green pixels with respect to the data voltage set when the driving of the red and green pixels R and G on which the image is displayed are rendered ( Close to the center of R, G) can minimize the phase error (phase error). In this case, since the blue pixel B is smaller than the other red and green pixels R and G, the storage capacitor must also be formed small. For this purpose, the conductor capacitor 68 for the storage capacitor of the blue pixel B may have different red and green colors. The area smaller than that of the conductive capacitor conductor pattern 68 for the green pixels R and G overlaps with the storage capacitor line 23.

However, in the case where the area of the blue pixel B is reduced with respect to the areas of the green and red pixels G and R, the area of the green pixel G is relatively large, so that the luminance is increased, but the values of X and Y in the color coordinates are increased. This increases, causing a problem that the image turns yellow overall. In order to solve this problem, it is preferable to increase the amount of blue light relative to the amount of red and green light of the backlight under the optimal conditions displayed in white when manufacturing a backlight that is a light source of the liquid crystal display device. In this way, the same color coordinates as in the case where the area ratios of red, green and blue are the same and the ratios of the red, green and blue light amounts in the backlight are the same can be obtained. As a result, when the area of the blue pixel is reduced to minimize the phase error during the rendering driving, the color coordinates may be adjusted to a desired value by adjusting the amount of blue light in the backlight, thereby optimizing color reproducibility.

Meanwhile, the above-described embodiment of the pixel electrode made of a transparent conductive material or a conductive material having a reflectivity has been described. The pixel electrode may include a transparent conductive film and a reflective conductive film together. Such a structure is semi-transmissive. It will be described in detail. Such a transflective liquid crystal display may be used interchangeably when displaying an image by reflecting light generated by an external light source to the pixel electrode or displaying an image by transmitting light generated from an internal light source to the pixel electrode.

FIG. 18 is a layout view illustrating a unit pixel structure of a transflective type liquid crystal display having a pixel array structure according to a ninth embodiment of the present invention, and FIG. 19 is cut along the line XIX-XIX ′ of FIG. 18. 20A to 20C are layout views showing the structure of a transflective liquid crystal display device having a pixel array structure according to a seventh embodiment of the present invention, and FIGS. 21A and 21B are first embodiment of the present invention. FIG. 22 is a layout view illustrating a structure of a transflective liquid crystal display device having a pixel array structure according to an example, and FIGS. 22A to 22C illustrate a structure of a transflective liquid crystal display device having a pixel array structure according to a sixth embodiment of the present invention. It is a layout. 20A to 22C, the structure of the unit pixel is not illustrated in detail, and only the arrangement structure of the transmission region and the reflection region in the pixel is schematically illustrated.

18 and 19, in the transflective liquid crystal display according to the ninth embodiment, the unit pixel structure of the thin film transistor substrate is the same as that of the first and seventh embodiments.

However, the upper surface of the passivation layer 180 has an uneven pattern, and the pixel electrode 190 connected to the drain electrode 175 through the contact hole 185 of the passivation layer 180 is made of a transparent conductive material. A reflective conductive film 192 is formed of a conductive material having excellent reflectivity on the top of the film 191 and the transparent conductive film 191 and has a transmission window 196 exposing the transparent conductive film 191. In this case, the area occupied by the transmission window 196 is a transmission area T that transmits light from an internal light source to display an image, and the remaining area of the pixel area P reflects light incident to an external light source. It is a reflection area S which reflects the film 192 and displays an image.

In the ninth embodiment of the present invention, a structure in which one unit pixel region P includes a transmission region T and a reflection region S in a transflective type liquid crystal display having a pixel array structure is described. The pixel structure having the transmission region T and the reflection region S may be similarly applied to the first to third embodiments and the seventh and eighth embodiments.

20A to 20C are diagrams of a liquid crystal display having a pixel array structure according to a seventh embodiment of the present invention, having a transflective type having a transmissive region T and a reflective region S. FIG. At this time, as shown in FIG. 20A, the transmission region T and the reflection region S may be alternately disposed in the column and row directions of the pixels with respect to the red (R), green (G), and blue (B) pixels. As shown in FIG. 20B, the transmission region T and the reflection region S may be alternately arranged in units of pixel rows, and as illustrated in FIG. 20C, red (R) and green ( The transmission region T and the reflection region S may be alternately disposed with respect to the G) and blue (B) pixels.

21A and 21B show a liquid crystal display having a pixel array structure according to a first embodiment of the present invention in a transflective type having a transmission region T and a reflection region S. FIG. In this case, as shown in FIGS. 21A and 21B, the transmission region T and the reflection region S may be alternately arranged with respect to the pixel row in the red (R) and green (G) pixels, and the blue (B). In the pixel, they are alternately arranged in the upper pixel and the lower pixel.

22A and 22B are diagrams illustrating a liquid crystal display having a pixel array structure according to a third exemplary embodiment of the present invention in a transflective type having a transmission region T and a reflection region S. FIG. As shown in FIG. 22A, the reflection area S and the transmission area T are disposed by dividing left and right in the blue (B) pixel, and the blue (B) pixel in the red (R) and green (G) pixels. One of the two red (R) and green (G) pixels facing each other has a reflection area S, and the other pixel has a transmission area T. At this time, the reflection area S and the transmission area T of the red (R) and green (G) pixels are positioned opposite to the reflection area S and the transmission area (T) of the blue (B) pixel. In addition, as shown in FIG. 22B, in each of the red (R) and green (G) blue (B) pixels, the reflection region S and the transmission region T are divided into two pixel regions.

Therefore, in the pixel array structure according to the present invention, it is possible to minimize the design cost while displaying a high resolution expressive ability which is more advantageous when displaying images of letters and figures, and at the same time, different data lines for transmitting signals to the blue unit pixels. In the same manner as in the above, it is possible to prevent the display characteristics from becoming uneven by forming in a straight line shape. In addition, the storage capacitor may be secured by using the gate line at the front end, and the storage capacitor may be uniformly formed by optimizing the parasitic capacitance generated by the overlap of the gate line and the pixel electrode connection unit. In addition, since the data wires and the gate wires are spaced apart at regular intervals, short circuits between neighboring wires can be prevented, and data driving integrated circuits can be arranged on one side of the display area using the data pad connection part. The size of the device can be optimized so that a repair line for repairing disconnection or short circuit of the wiring can be easily formed around the display area. In addition, inverting driving having a more uniform polarity can be performed by applying the image signals of the red and green pixel columns adjacent to each other between two blue pixel columns electrically connected to each other. In addition, by shifting the adjacent blue pixel columns by 1/2 pixel, uniform inversion driving can be performed by using the gate line or the gate line of the front end in all the blue pixels, and the holding capacitance can be uniformly ensured. . In addition, the maximum aperture ratio can be ensured by overlapping the gate line, the data line, and the pixel electrode through an insulating material having a low dielectric constant, and through this, the rendering driving technique can be effectively applied to express the image more delicately and with higher resolution. . In addition, by transferring the image signal through the data pads through each data pad, it is not necessary to construct a complicated wiring structure or a connection structure, and the rendering driving or the inversion driving can be easily performed. In addition, by applying a pixel array structure capable of high resolution to a semi-transmissive type, it is possible to improve the transmittance and reflectance of the pixel, thereby improving the contrast ratio and visibility of the liquid crystal display.

Claims (13)

A pixel array composed of a blue pixel and a pair of red and green pixels arranged to surround the blue pixel, wherein pixels of the same color are disposed on a diagonal line around the blue pixel; A gate line transferring a scan signal or a gate signal to the pixel; A data line transferring an image or data signal to the pixel, Pixel electrodes disposed in the pixels, A thin film transistor disposed on the pixel and including a gate electrode connected to the gate line, a source electrode connected to the data line, and a drain electrode connected to the pixel electrode, Wherein each of the blue pixels has a transmissive region for displaying an image using transmitted light and a reflective region for displaying an image using reflected light. In claim 1, One of the two red and green pixels facing the blue pixel as a center consists of a reflection area, and the other is a transmission area. In claim 1, Each of the red and green pixels has a transmission region and a reflection region together. A first column and a second column in which red and green pixels are alternately repeated in a column direction, and a third column positioned between the first and second columns and in which blue pixels are arranged in a column direction; A pixel array in which red pixels of the first column and green pixels of the second column are disposed to face each other; A gate line transferring a scan signal or a gate signal to the pixel; A data line insulated from and crossing the gate line to transfer an image or data signal to the pixel; Pixel electrodes disposed in the pixels, A thin film transistor disposed on the pixel and including a gate electrode connected to the gate line, a source electrode connected to the data line, and a drain electrode connected to the pixel electrode, Wherein each of the pixels comprises a transmissive region for displaying an image using transmitted light or a reflective region for displaying an image using reflected light. In claim 4, And the transmission area and the reflection area are alternately disposed with respect to the pixel row. In claim 5, And a pixel positioned diagonally around the pixel area of the pixel array in the same reflective or transmissive area. In claim 4, In the blue pixel, a reflection area and a transmission area are alternately disposed every two rows. And a reflective or transmissive region different from the blue pixel on an opposite side of the blue pixel. In any one of claims 5 to 7, And the pixel electrode of the blue pixel is connected through a pixel electrode connection part with respect to two pixel rows. In claim 8, And the pixel electrode connection parts are alternately arranged with respect to two pixel rows. In claim 2, The blue pixel has a reflection area and a transmission area together. And a reflection area of the blue pixel and a reflection area of the red and green pixels are opposite to each other with respect to the vertical center line of the pixel array. In claim 1, And the pixel array is a rectangle. In claim 11, The blue pixel is a rhombus, Wherein the green and red pixels are squares with corners chamfered, and the blue pixels are the chamfered sides. In claim 12, And an area occupied by the blue pixel in the pixel array is smaller than an area occupied by the red pixel or the green pixel.

Images