KR20050065115A - Driving unit of liquid crystal display - Google Patents

Abstract

The present invention relates to a driving part of a liquid crystal display device, wherein the driving part of the liquid crystal display device of the present invention includes a first substrate and a second substrate bonded to each other, a gate pad part disposed in an exposed area of the first substrate, A data pad unit, a plurality of gate lines and a plurality of data lines arranged vertically and horizontally on the first substrate, an image display unit provided in an area where the gate lines and the data lines intersect, and the first substrate, A first line-on-glass wiring and a second line-on-glass wiring, which are formed outside the image display unit and supply a scan signal, are electrically connected to the first line-on-glass wiring, and connected to the gate line. A plurality of first switching units which are individually connected to individually switch the scan signals applied from the first line-on-glass wiring, and are electrically connected to the second line-on-glass wiring And a plurality of second switching units individually connected to the gate lines to individually switch the scan signals applied from the second line-on-glass wiring, thereby making the liquid crystal display device thinner and lighter. Therefore, the production cost can be reduced.

Description

DRIVING UNIT OF LIQUID CRYSTAL DISPLAY}

The present invention relates to a driving unit of a liquid crystal display, and more particularly, to a driving unit of a liquid crystal display for applying a high potential scan signal and a low potential scan signal through separate lines.

 In general, a liquid crystal display is a thin film transistor array substrate and a color filter substrate facing each other are bonded to each other at regular intervals, and between the thin film transistor array substrate and the color filter substrate. A liquid crystal panel having a liquid crystal layer formed thereon, a data driver for supplying image information to the liquid crystal panel, and a gate driver for supplying a scan signal.

In the thin film transistor array substrate, a plurality of gate lines arranged to be uniformly spaced laterally and a plurality of data lines arranged to be vertically spaced apart intersect each other, and the gate line and the data are intersected with each other. Pixels are defined in regions where lines intersect. The pixels are individually provided with a switching device such as a thin film transistor (TFT), and the switching device is electrically connected to the data line and the gate line.

In addition, red, green, and blue color filters are formed at positions corresponding to the pixels on the color filter substrate, and black is formed to surround the outer edges of the color filters to prevent color interference of light passing through the pixels. A matrix is formed. A common electrode for applying an electric field to the liquid crystal is formed by the voltage difference between the pixel electrodes of the thin film transistor array substrate.

The gate driver sequentially applies a scan signal to the gate line every frame unit. In this case, the switching elements connected to the gate line to which the scan signal is applied are turned on, and image information applied from the data line is applied to the pixel electrode of the pixel through the switching element.

Hereinafter, a general liquid crystal display device will be described in detail with reference to the accompanying drawings.

1 is a view schematically showing a general liquid crystal display device.

Referring to FIG. 1, a liquid crystal panel 10, a plurality of gate TCPs 22 connected to one side of the liquid crystal panel 10 and a gate printed circuit board 21, and the gate TCP ( 22, a plurality of gate driving integrated circuits 23 mounted respectively, a plurality of data TCPs 32 connected to one side of the liquid crystal panel 10 and a data printed circuit board 31, and the data TCP ( And a plurality of data driving integrated circuits 33 respectively mounted on 32).

The liquid crystal panel 10 is bonded to the thin film transistor array substrate 11 and the color filter substrate 12 so as to have a constant cell-gap, and a liquid crystal layer is formed at the cell-gap. .

One side short side and one side long side of the thin film transistor array substrate 11 protrude from the color filter substrate 12, and the gate pad portion and the data pad portion are provided in the protruding region of the thin film transistor array substrate 11. In addition, an image display unit 13 in which an image is actually displayed is provided in an area where the thin film transistor array substrate 11 and the color filter substrate 12 face each other.

In the image display unit 13, a plurality of gate lines 20 are arranged in the horizontal direction and connected to the gate pad unit, and a plurality of data lines 30 are arranged in the longitudinal direction and connected to the data pad unit. In addition, the gate line 20 and the data line 30 cross each other, and pixels including the switching element and the pixel electrode are formed in the intersecting regions.

The image display part 13 of the color filter substrate 12 includes a red, green, and blue color filter that is separated and applied to each pixel by a black matrix, and a pixel electrode provided in the thin film transistor array substrate 11. A common electrode for applying an electric field to the layer is provided.

The data TCP 32 is attached to and electrically connected to a part of the data printed circuit board 31 and a part of the data pad part. In addition, the data driving integrated circuit 33 is separately mounted on the data TCP 32. A TCP input line 34 and a TCP output line 35 are formed on the data TCP 31. The image information supplied from the data printed circuit board 31 is driven through the TCP input line 34. The image information applied to the integrated circuit 33 and digital-analog converted by the data driving integrated circuit 33 is outputted through the TCP output line and applied to the data line.

The gate TCP 22 is attached to and electrically connected to a portion of the gate printed circuit board 21 and a portion of the gate pad portion. The gate driving integrated circuit 23 is separately mounted on the gate TCP 22, and the gate driving integrated circuit 23 corresponds to various control signals and driving voltages applied from the gate printed circuit board 21. The scan signal is output to the gate line 30.

The gate driving integrated circuit 23 sequentially applies a scan signal to the gate line 20 every frame period. That is, the high potential scan signal is applied only to one gate line 20, and the low potential scan signal is applied to the other gate line 20. As such, when a high potential scan signal is applied to the gate line 20, switching devices (not shown) electrically connected to the gate line 20 are turned on, and the data line is connected to the data line through the switching devices. Image information supplied from 30 is applied to the pixel electrode. At this time, an electric field is formed between the pixel electrode and the common electrode of the color filter according to the voltage size of the applied image information, and the liquid crystal is driven by the electric field to display an image.

Recently, among various flat panel display devices, a liquid crystal display device providing a short thickness and high definition image quality is mainly used, and has been mass-produced to satisfy many demands. In mass production of such liquid crystal display devices, reduction of production costs and thinning and weight reduction of liquid crystal display devices according to recent trends are important factors.

However, in the conventional liquid crystal display device as described above, the gate printed circuit board and the data printed circuit board are provided, the gate TCP and the data TCP are connected to the pad part, and many lines are formed in each gate pad part and the data pad part. The manufacturing process is complicated and there is a limit in making the liquid crystal display device thinner and lighter.

Accordingly, the present invention has been devised to solve the same problem as the prior art, and the present invention can simplify the pad part by applying a scanning signal through separate lines provided on the outside of the image display part, and make the liquid crystal display device thinner and lighter. The purpose is to reduce production costs.

According to an aspect of the present invention, a liquid crystal display device includes: a first substrate and a second substrate bonded to each other, a gate pad portion and a data pad portion provided in an exposed area of the first substrate; A plurality of gate lines and a plurality of data lines arranged vertically and horizontally on the first substrate, an image display unit provided in an area where the gate lines and the data lines intersect, and formed on the first substrate, A first line-on-glass wiring and a second line-on-glass wiring and a first line-on-glass wiring to form a scan signal and are electrically connected to the first line-on-glass wiring, and the gate A plurality of first switching units which are individually connected to a line and individually switch the scan signals applied from the first line-on-glass wiring, and are electrically connected to the second line-on-glass wiring, Is separately connected to a trad in the second line is configured to include a plurality of second switches for individually switching the scanning signal is received from a glass wire-on.

The present invention constructed as described above removes the gate driving integrated circuit which previously outputs the scan signal, and separates the line-on-glass wiring for supplying the high potential scan signal and the low potential scan signal, respectively, on the thin film transistor array substrate. To simplify the gate pad portion. Therefore, the space of the gate pad portion can be utilized to form a circuit such as an antistatic circuit.

In addition, if the gate pad portion is simplified, the weight of the liquid crystal display device can be reduced and the thickness of the liquid crystal display device can be reduced, thereby making the liquid crystal display device thinner and lighter.

Hereinafter, a liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic view of a liquid crystal display according to a first embodiment of the present invention.

Referring to FIG. 2, a thin film transistor array substrate 111 and a color filter substrate 112 bonded to each other and a gate pad portion and data provided in an exposed edge region of the thin film transistor array substrate 111. A pad portion, a plurality of data lines and gate lines arranged vertically and horizontally on the thin film transistor array substrate, an image display portion provided in an area where the data lines and the gate lines intersect, and a plurality of data attached to the data pad portion Image information is applied to the data driving integrated circuit 133 through a TCP 132, a data driving integrated circuit 133 separately mounted on the data TCP 132, and the data TCP 132 electrically connected thereto. A data printed circuit board 131, a first line-on-glass wiring 140 and a second line-on-glass wiring 141 formed outside the image display unit to supply a scanning signal, and the first line-on-glass wiring 141. A - it is configured to include a plurality of the switching unit 145 that individually switches the scanning signal applied through the glass wiring 141-on-glass wiring 140 and the second line-on.

In general, the thin film transistor array substrate 111 has a larger area than the color filter substrate 112. Therefore, when the thin film transistor array substrate 111 and the color filter substrate 112 are bonded together, a part of the thin film transistor array substrate 111 is exposed to the outside. In this case, the data pad portion and the gate pad portion are exposed in the exposed area. It is provided.

The data pad part and the gate pad part may be formed on one side or both sides, respectively, according to the bonding position of the thin film transistor array substrate 111 and the color filter substrate 112.

The data driving integrated circuit 133 is mounted on the data TCP 132, and the data TCP 132 is attached to each of the data pad part and the data printed circuit board 131. Image information supplied from 131 is applied to the data driving integrated circuit 133 via the data TCP 132. In this case, the data driving integrated circuit 133 converts the applied digital image information into analog image information and outputs the image information to the data lines 120.

The data lines 120 are arranged to be vertically spaced apart from each other, and intersect with the gate lines 130 arranged to be horizontally spaced apart from each other to define a plurality of rectangular regions. The rectangular area is defined as a pixel, and the plurality of pixels are arranged in a matrix to constitute an image display unit in which an image is actually displayed.

As shown, first and second line-on-glass wiring lines 140 and 141 are formed in the gate pad portions provided on both sides of the thin film transistor array substrate 111. More precisely, it is formed outside the image display unit.

The first line-on-glass wiring 140 extends to the first data TCP 132 to receive a high potential scan signal from the data printed circuit board 131, and the second line-on-glass wiring 141. ) Extends to the last data TCP 132 to receive a low potential scan signal from the data printed circuit board 131. That is, the first line-on-glass wiring 140 and the second line-on-glass wiring 141 receive scan signals of different potentials.

In this case, the first data TCP and the last data TCP are designed to be slightly wider than the other data TCP 132 because the first line-on-glass wiring 140 and the second line-on-glass wiring 141 are formed to extend. It is desirable to.

Meanwhile, a plurality of switching units 145 and 146 are electrically connected to the first line-on-glass wiring 140 and the second line-on-glass wiring 141, respectively, and the switching units 145 and 146 respectively. Scan signals applied through the first line-on-glass wiring 140 or the second line-on-glass wiring 141 are individually switched.

The first switching unit 145 and the second switching unit 146 are connected to one side and the other side of each gate line 120. In other words, the first switching unit 145 is connected to one side of each gate line 120, and the second switching unit 146 is connected to the other side thereof.

The first switching unit 145 and the second switching unit 146 as described above will be described in more detail with reference to the drawings.

3 is a view schematically showing a connection configuration of a switching unit.

In this drawing, the first line-on-glass wiring 240 and the second line-on-glass wiring 241, the switching units SB_H1 to SB-H5, SB_L1 to SB_L5 and the gate which are important components of the present invention are shown. The interconnect arrangement of line 220 is shown intensively, and the remaining components are omitted.

Referring to FIG. 3, a first line-on-glass wiring 240 and a second line-on-glass wiring 241 are formed on a thin film transistor array substrate (not shown). A plurality of first switching units SB_H1 to SB_H5 are electrically connected to the first line-on-glass wiring 240, respectively, and a plurality of second switching units to the second line-on-glass wiring 241. (SB_L1 to SB_L5) are each electrically connected.

When the high potential scan signal VGH is applied to the first switching units SB_H1 to SB_H5 through the first line-on-glass wiring 240, each of the first switching units SB_H1 to SB_H5 is individually provided. Switch the applied high potential scan signal (VGH). Similarly, when the low potential scan signal VGL is applied to the second switching units SB_L1 to SB_L5 through the second line-on-glass wiring 241, each of the second switching units SB_L1 to SB_L5 is applied. Switches individually the applied low potential scan signal VGL.

First switching units SB_H1 to SB_H5 and second switching units SB_L1 to SB_L5 are connected to both sides of the gate line 220, respectively, and the first switching units SB_H1 to SB_H5 and the second switching unit SB_L1 are connected to each other. Only one switching unit of SB_L5 operates. Therefore, only one scan signal of the high potential scan signal and the low potential scan signal is applied to the gate line 220. At this time, when the switching unit is operating, the line-on-glass wiring 240 and 241 is electrically connected to the gate line 220, so that the scan signal is applied to the gate line 220 through the switching unit, and the switching unit is not operated. The line-on-glass wirings 240 and 241 and the gate line 220 are electrically blocked.

The operations of the first switching units SB_H1 to SB_H5 and the second switching units SB_L1 to SB_L5 will be described in detail as follows.

The scan signal is applied to the first line-on-glass wiring 240 and the second line-on-glass wiring 241 every horizontal period. In this case, since the high potential scan signal VGH should be applied to only one gate line 220 in every horizontal period, the high potential scan signal VGH supplied through the first line-on-glass wiring 240 is The gate line 220 is applied to the corresponding gate line 220 only through one of the first switching units SB_H1 to SB_H5 among the plurality of first switching units SB_H1 to SB_H5. The low potential scan signal VGL supplied through the second line-on-glass wiring 241 is applied to the remaining gate lines 220 except for the gate line 220 to which the high potential scan signal VGH is applied. Is approved.

For example, when the high potential scan signal VGH supplied through the first line-on-glass wiring 240 is applied to the first gate line 220A through the first first switching units SB_H1 to SB_H5, The low potential scan signal VGL supplied through the second line-on-glass wiring 241 receives the first second switching unit SB_L1 in the gate lines 220B to 220E except for the first gate line 220A. The remaining second switching units SB_L1 to SB_L5 are applied. At this time, the switching unit connected to the other side of the same gate line 220 is cut off to correspond to the switching unit to which the high potential scan signal VGH or the low potential scan signal VGL is applied.

In addition, when the high potential scan signal VGH supplied through the first line-on-glass wiring 240 is applied to the second gate line 220B through the second first switching unit SB_H2, the second gate line. The first second switching unit SB_L2 connected to the other side of 220B is blocked. The low potential scan signal VGL is applied to the corresponding gate line 220 through the remaining second switching units SB_L1, SB_L3, SB_L4, and SB_L5 except for the second second switching unit SB_L2.

As described above, the driving unit of the liquid crystal display device of the present invention forms a line-on-glass wiring for supplying a high potential scan signal and a low potential scan signal to the liquid crystal panel, thereby providing a gate TCP and a gate driving integrated circuit from the liquid crystal display device. Can be removed to secure the space of the pad portion, and thus, some parts can be removed, thereby making the liquid crystal display device thinner and lighter. In addition, the production cost can be reduced by removing the parts.

1 is a schematic view showing a general liquid crystal display device.

2 is a schematic view showing a liquid crystal display device according to a first embodiment of the present invention;

3 is a view showing briefly the connection configuration of the switching unit.

** Description of the symbols for the main parts of the drawings **

110: liquid crystal panel 111: thin film transistor array substrate

112: color filter substrate 113: image display unit

120: gate line 130: data line

131: data printed circuit board 132: data TCP

133: data driving integrated circuit 134: TCP input line

135: TCP output line 140: first line-on-glass wiring

141: second line-on-glass wiring 145: first switching unit

146: second switching unit

Claims (7)

A first substrate and a second substrate bonded together to maintain a constant cell-gap opposite to each other; A gate pad part and a data pad part disposed in an edge region of the first substrate; A plurality of gate lines and a plurality of data lines arranged vertically and horizontally on the first substrate; An image display unit provided in an area where the gate line and the data line cross each other, and displaying an image; First line-on-glass wiring and second line-on-glass wiring formed outside the image display unit to supply a scanning signal; A plurality of first switching units electrically connected to the first line-on-glass wirings and individually connected to the gate lines to individually switch the scan signals applied from the first line-on-glass wirings; And A plurality of second switching units electrically connected to the second line-on-glass wirings and individually connected to the gate lines to individually switch the scan signals applied from the second line-on-glass wirings And a driving unit of the liquid crystal display device. The liquid crystal display driver of claim 1, wherein the first substrate is a thin film transistor array substrate, and the second substrate is a color filter substrate. The liquid crystal display driver of claim 1, wherein the gate pad parts are provided on both sides of the first substrate. The liquid crystal display of claim 1, wherein a high potential scan signal is applied through the first line-on-glass wiring, and a low potential scan signal is applied through the second line-on-glass wiring. Driving part. The driving unit of claim 1, wherein the first switching unit is connected to one side of each gate line, and the second switching unit is connected to the other side of the gate line. 6. The driving unit of claim 5, wherein only one of the first switching unit and the second switching unit connected to one gate line is driven. The liquid crystal display driver of claim 1, wherein only one of the plurality of first switching units is driven at every horizontal period.