KR100977734B1 - LCD with Narrow BM - Google Patents

Abstract

The present invention relates to a liquid crystal display having a narrow beam to slim the width of the black matrix formed on the outer line of the liquid crystal panel, wherein at least one edge portion of the gate IC 112 on the COF 122 A TFT substrate 110 mounted on the TFT substrate, a color filter 120 bonded to the TFT substrate 110 to form a liquid crystal panel 100, and a backlight unit installed on a rear surface of the liquid crystal panel 100. In the liquid crystal display device, at least one of the Vcom lines 130 of the Vcom lines 130 mounted on the TFT substrate 110 to apply a reference voltage is a COF 122 having the gate IC 112 mounted thereon. Characterized in that it is installed via). The present invention can efficiently arrange the Vcom line 130, and minimizes the line resistance of the Vcom line 130 to minimize the potential difference between the short points, ultimately to the narrow bezel It has the effect of improving the continuity of the screen when configuring the multi-screen of the tiled form.

LCD, Black Matrix, BM, Liquid Crystal Panel, Vcom, Short Point, TFT, Color Filter

Description

Liquid crystal display having narrow black {{Liquid crystal display having narrow black matrix}

The present invention relates to a liquid crystal display having a narrow beam, and more particularly, to mount the Vcom line via a COF mounted with a gate IC, thereby minimizing the line resistance of the Vcom line and slimming the BM width of the liquid crystal panel. The present invention relates to a liquid crystal display having a narrow beam that can be designed.

In general, a liquid crystal display (LCD) is formed by bonding a TFT (Thin Film Transistor) substrate and a color filter to form a liquid crystal panel, and a back light unit (BLU) is installed on the rear side of the liquid crystal panel. do. In such an LCD, when a predetermined voltage is applied to the TFT formed on the TFT substrate, the arrangement of the liquid crystals enclosed in the liquid crystal panel is changed, and the optical characteristics of the light passing through the polarizing plate and the liquid crystal are changed to color through the color filter. It is a display means for outputting the image.

1 shows a laminated structure of a typical LCD. The LCD usually has a structure in which a BLU 10, a TFT substrate 20, and a color filter 30 are stacked in a chassis not shown. The BLU 10 is a light emitting means for giving visibility to the LCD. The TFT substrate 20 is provided with a TFT, a charge accumulation capacitor, a gate line wiring, a source line wiring, and the like, and is bonded to the color filter 30 to form a liquid crystal panel 40. The color filter 30 imparts a color to the amount of light that changes according to the arrangement change of the liquid crystal, and a photoresist of RGB is deposited on the glass substrate, and a polarizing film is attached onto the color filter 30. A drive IC for driving the panel is mounted at the edge portion of the TFT substrate 20. The source IC 23 is mounted on the lower edge portion of the TFT substrate 20, and the gate IC 27 is mounted on the side edge portion of the TFT substrate 20.

2 shows an example in which a conventional TFT substrate 20 and a color filter 30 are bonded to form a liquid crystal panel 40. The source IC 23 and the gate IC 27 described above may be mounted on the edge portion of the TFT substrate 20 in the form of a chip on the film (COF) or a chip on the glass (COG). Typically, in order to minimize the mounting area of the drive IC at the edge portion of the TFT substrate 20, the drive ICs are mounted in the form of COF.

Referring to FIG. 2, a COF 33 having a source IC 23 mounted thereon is installed at a lower edge portion of the TFT substrate 20, and a COF 37 having a gate IC 27 mounted thereon is installed at a right edge portion thereof. do. In addition, the left edge portion and the upper edge portion of the TFT substrate 20 form a dummy region 50, and the dummy pad 50 for inspecting the liquid crystal panel 40 after bonding ICs is formed in the dummy region 50. Are mounted.

As shown in FIG. 2, the Vcom line 60 is formed along the outer line of the portion where the TFT substrate 20 and the color filter 30 are bonded to each other. The Vcom line 60 is used to provide a reference voltage for determining polarity when driving the liquid crystal, and is used as a bias voltage of the charge storage capacitor formed in the TFT substrate 20. In some cases, the Vcom signal is transmitted to the color filter 30 through the short point 65.

Referring to FIG. 2, the Vcom line 60 is applied to both bottom edges of the TFT substrate 20 via the COF 33 having the source IC 23 mounted thereon, and short points 65 are formed at both bottom edges of the TFT substrate 20. do. The Vcom line 60 is formed on the left outer line and the upper outer line on which the gate IC 27 is not mounted, and short points 65 are formed at the upper left and upper right corners. Such a Vcom line 60 and a seal line (not shown) for bonding the TFT substrate 20 and the color filter 30 to each other should be concealed. For this purpose, the lower surface of the color filter 30 is diagonally illustrated in FIG. Black Matrix (BM) 35 is printed in the hatched area.

At this time, another problem that the Vcom line 60 is formed on the TFT substrate 20 is an increase in resistance along the length of the Vcom line 60. In general, in forming the Vcom line 60 by depositing aluminum, chromium, molyb, etc. on the TFT substrate 20, the thickness and width of the Vcom line 60 is inevitably limited due to design and process limitations. Therefore, an increase in resistance along the length of the Vcom line 60 occurs, which causes a slight change in the reference voltage at the short points 65.

In particular, as the Vcom line 60 is mounted avoiding an area in which the gate IC 27 is mounted, the Vcom signal is transmitted through the Vcom line 60 which is considerably longer to the short point 65 of the upper right end. Therefore, a potential difference between the short point 65 at the lower left end and the short point 65 at the upper right is generated, which causes afterimages or flickers during liquid crystal driving, which acts as a factor of degrading image quality.

On the other hand, in order to minimize the line resistance of the Vcom line 60, as shown in FIG. 2, the width of the Vcom line 60 of the left edge portion is designed to be wider than that of the Vcom line 60 of the upper edge portion. . However, there is still a phenomenon that the potential of the upper right short point 65 falls. Furthermore, increasing the width of Vcom line 60 causes an increase in the BM 35 width. Increasing the width of the BM 35 means that the bezel width of the LCD housing is increased.

In the case of general LCDs, the increase in the bezel width does not affect the competitiveness of the product. However, when a plurality of large-screen LCDs (approximately 40 inches or more) are combined to form a so-called "tiled" type multi-screen, the bezel outside the LCD is It decreases the continuity of the screen and acts as a factor that hinders the readability of characters.

The present invention has been proposed to solve the above problems, by installing the Vcom line via a COF mounted with a gate IC, more efficiently arrange the Vcom line and reduce the line resistance of the Vcom line to reduce the potential between the short points Ideally matched to the LCD panel by minimizing the BM width on the outside of the LCD panel to slim the bezel width, ultimately to improve the continuity of the screen and readability of the character when configuring a multi-screen multi-screen combination SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal display device having a narrow beam that improves the efficiency.

In addition, the present invention is to mount the remaining Vcom line on the transmission medium such as FPC or PCB to bypass the liquid crystal panel, so that the Vcom line has a sufficient thickness and width to minimize the voltage loss in the Vcom line It is an object of the present invention to provide a liquid crystal display device having a low BM.

A liquid crystal display having a narrow beam of the present invention for achieving the above object, the TFT substrate 110 in which the gate IC 112 is mounted on the COF 122 at at least one edge portion, and the TFT In the liquid crystal display device comprising a color filter 120 bonded to the substrate 110 to form a liquid crystal panel 100, and a backlight unit provided on the back of the liquid crystal panel 100, the TFT substrate ( At least one of the Vcom lines 130 mounted on the 110 and applying the reference voltage may be installed via the COF 122 in which the gate IC 112 is mounted.

According to a preferred embodiment, the Vcom line 130 is disposed behind the gate IC 112 on the COF 122 in which the gate IC 112 is mounted.

According to a more preferred embodiment, the Vcom line 130 is partially mounted on the black matrix 105 region or the glass region in which the gate IC 112 is mounted outside the liquid crystal panel 100.

According to a more preferred embodiment, the Vcom line 130 is mounted on the FPC 132 or PCB 162 is installed outside the liquid crystal panel 100, the gate from the FPC 132 or PCB 162 The IC 112 is applied to the outer portion of the liquid crystal panel 100 via the mounted COF 122 to form the short point 135.

In the above embodiment, a power line and a signal line for driving the gate IC 112 are mounted together on the FPC 132 or the PCB 162.

According to the liquid crystal display device having a narrow beam of the present invention, the Vcom line is installed via a COF in which the gate IC is mounted, so that the Vcom line can be arranged close to the region where the gate IC is mounted, so that the Vcom line is installed. In the COF, it is easy to select a conductive material such as copper as the material of the Vcom line, and the thickness and width of the Vcom line can be designed large enough to minimize the line resistance of the Vcom line to minimize the The potential difference can be matched ideally, and the width of the Vcom line can be reduced at the edge of the liquid crystal panel, so that the width of the BM can be designed slim, and the tiled multi-screen is constructed toward the narrow bezel of the LCD. In this case, it has the effect of improving the continuity of the screen and improving the readability of the characters at the border between the LCD.

In addition, according to the present invention, the Vcom line is partially mounted on a transmission medium such as an FPC or a PCB, thereby minimizing a voltage loss in the Vcom line.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

First, the present invention is to design a slim bezel width of the LCD outside by minimizing the width of the black matrix (hereinafter referred to as "BM") of the liquid crystal panel, the Vcom line for applying a reference voltage to the liquid crystal panel It is installed so as to pass through the COF in which the gate IC is mounted, so that the width of the Vcom line can be reduced in the liquid crystal panel edge part, and a liquid having a narrow beam that can slimly design the BM area outside the liquid crystal panel correspondingly. It relates to a display device.

In the following description, the configuration of the liquid crystal panel for slimming the BM region as described above will be mainly described, and detailed description of the configuration of the BLU, chassis, etc. will be omitted.

3 is a plan view illustrating an exemplary configuration of the liquid crystal panel according to the present invention, and shows a state in which the gate IC 112 and the source IC 116 of the TFT substrate 110 are mounted. The gate IC 112 is a drive IC that applies a drive signal to a horizontal gate line formed on the TFT substrate 110, and the source IC 116 is a drive IC that applies a drive signal to a source line in the longitudinal direction. In the example shown, gate IC 112 and source IC 116 are each mounted in the form of a COF. As shown, the COF 122 on which the gate IC 112 is mounted is attached to the right edge glass region of the TFT substrate, and the COF 126 on which the source IC 116 is mounted is attached to the lower edge glass of the TFT substrate. Attached to the area.

The dummy region 150 is formed at the left edge portion and the upper edge portion of the liquid crystal panel 100. In this dummy region 150, inspection pads 152 for inspecting the liquid crystal panel 100 are mounted before bonding of the ICs. After the TFT substrate 110 and the color filter 120 are bonded, the liquid crystal panel 100 needs to be inspected before the T_con block 140 for applying the driving signal to the drive ICs is coupled. In the first inspection process, a probe is connected to the inspection pad 152 to apply a test signal to the gate line and the source line formed on the TFT substrate 110. The dummy area 150 is a mounting area for the test pad 152 for receiving the test signal, and is a substantially unnecessary area after the T_con block 140 is connected. Therefore, the dummy region 150 may be removed after the first inspection of the liquid crystal panel 100 is completed. On the other hand, in the case of a large screen LCD, the dummy region 150 as described above may not exist. For example, the probe may be directly connected to a COF pad connected to the gate line and the source line without applying the test pad 152 to apply a test signal.

As shown, the BM 105 is formed along the outer line of the liquid crystal panel 100. In more detail, when fabrication of each of the TFT substrate 110 and the color filter 120 is completed, the foreign matter on the surface is removed through a cleaning process, a process of printing an alignment film, and the like, followed by the TFT substrate 110 and the color filter. A seal is applied along the outline of 120. In this case, the BM 105 is printed on the lower surface of the outer line of the color filter 120 to conceal the region where the seal is applied and the Vcom line 130 formed on the outer line of the TFT substrate 110.

In the liquid crystal panel 100 of the present invention, the Vcom line 130 is mounted on the left edge portion and the right edge portion, as shown. The upper left short point 135 and the upper right short point 135 receive Vcom signals from the Vcom line 130 of the left edge portion and the Vcom line 130 of the right edge portion, respectively.

The lower left short point 135 and the lower right short point 135 receive a Vcom signal through the COF 126 in which the lower source IC 116 is mounted, as in the related art. The Vcom line 130 of the left edge portion extends from the lower left short point 135 to be formed on the left BM 105 region and ends with the upper left short point 135. In this case, since the Vcom line 130 does not need to be mounted on the upper edge portion, the Vcom line 130 on the left edge portion may be designed to have a slim width as compared with the related art. In addition, the Vcom line 130 of the left edge portion of the present invention has a shorter total length of the Vcom line than the Vcom line is formed over the left edge portion and the upper edge portion, and thus, the line resistance of the Vcom line 130 is increased. This is greatly reduced.

The reason why the Vcom line could not be formed near the edge portion where the gate IC was mounted in the related art was because of the difficulty in wiring because the signal line drawn from the gate IC 112 and the Vcom line cross each other. However, in the present invention, as shown, the Vcom line 130 is installed via the COF 122 in which the gate IC 112 is mounted, so that the Vcom line 130 can be mounted on the right edge portion.

Preferably, as shown in FIG. 3, the Vcom line 130 is disposed behind the gate IC 112 on the COF 122 in which the gate IC 112 is mounted. Accordingly, the Vcom line 130 may be mounted on the right edge portion so as not to cross-wire with the signal line drawn from the gate IC 112.

The Vcom line 130 at the right edge may start from the short point 135 at the bottom right. More preferably, as shown in the drawing, the lowermost COF 122 of the COF 122 mounted with the Vcom circuit unit 142 and the gate IC 112 that generates the Vcom signal in the T_con block 140 is replaced with an FPC ( A Vcom line 130 is formed on the FPC 132 by connecting to a transfer medium such as 132, and the Vcom line 130 is transferred to the lowest COF 122. The Vcom line 130 drawn out from the lowest COF 122 is transferred to the next COF 122 through the BM 105 region of the right edge portion or the glass region of the right edge portion.

Although conceptually illustrated in FIG. 3, the gate IC 112 is typically mounted in an area of most of the glass region of the right edge portion. Therefore, the Vcom line 130 of the right edge portion mostly passes through the COF 122, and a relatively small portion is mounted in the BM 105 or the glass region.

In this way, the Vcom line 130 is provided so as to pass through the COF 122 in which the gate IC 112 is mounted, so that the Vcom line does not need to be mounted at the upper edge portion, and the left edge portion and the right edge portion, respectively. Since the Vcom line 130 may be arranged, the Vcom line 130 may be more efficiently arranged. In addition, since the total length of the Vcom line 130 of the left edge portion is shortened, the line resistance can be greatly reduced. Since a substantial portion of the Vcom line 130 of the right edge portion is mounted on the COF 122, copper (Cu) may be used as a material for forming the Vcom line 130, as well as the thickness of the Vcom line 130. It does not have to be limited in width. Therefore, an increase in resistance due to the length of the Vcom line 130 hardly occurs. As such, the reduction in line resistance by Vcom line 130 makes it possible to ideally match the potential difference between short points 135. Therefore, a more uniform reference voltage can be provided to the TFT substrate 110 or the color filter 120 side, and it is possible to prevent afterimage generation or flicker due to the potential difference between the short points 135.

Furthermore, the width of the Vcom line 130 at the left and right edges becomes very slim, which means that the area of the BM 105 for concealing the Vcom line 130 can be reduced. Accordingly, it is possible to implement a narrow beam and narrow bezel to which the present invention is directed.

4 shows another configuration of the liquid crystal panel according to the present invention. In FIG. 4, the configuration of the Vcom line 130 at the left edge part is the same as that of the embodiment of FIG. 3, and thus redundant descriptions thereof will be omitted.

Looking at the configuration of the Vcom line 130 of the right edge portion in Figure 4, as shown, the Vcom line 130 is mounted on the PCB 162 in the right edge portion is installed outside the liquid crystal panel 100. And, Vcom line 130 only partially passes through COF 122. In FIG. 4, the PCB 162 is divided into two, but the PCB 162 may be formed of a single PCB or may be replaced with another transmission medium such as an FPC. If a single PCB 162 is installed, the area where the Vcom line 130 passes through the COF 122 on which the gate IC 112 is mounted will be further reduced.

As described above, when the Vcom line 130 reduces the area passing through the COF 122, it is difficult to solve the wiring problem in which the signal line wiring of the gate IC 112 and the Vcom line 130 wiring do not overlap each other. It will be easier to solve.

In addition, the embodiment of FIG. 4 provides other technical advantages. Although not shown, a driving line such as a power line and a signal line for driving the gate IC 112 is drawn from the T_con block 140, and these driving lines are connected to the gate IC 112. Conventionally, such driving lines have passed through the BM 105 region or the glass region of the right edge portion. In this case, as in the embodiment of FIG. 4, when a substantial portion of the Vcom line 130 is mounted by bypassing the liquid crystal panel 100 using a transmission medium such as the PCB 162 or the FPC 132, The same gate IC driving lines may be mounted on the PCB 162 or the FPC 132 together. Accordingly, as in the case of the Vcom line 130, signals through the driving line can be transmitted to the gate IC 112 without loss, and the BM 105 or the glass region outside the liquid crystal panel 100 is narrower. Can be designed.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is an exploded perspective view showing a laminated structure of a general LCD

2 is a plan view showing a configuration example of a conventional liquid crystal panel

3 is a plan view showing a configuration example of a liquid crystal panel according to an embodiment of the present invention;

4 is a plan view illustrating a configuration example of a liquid crystal panel according to another exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: liquid crystal panel 105: black matrix

110 TFT substrate 112 gate IC

116 Source IC 120 Color Filter

122: COF 126: COF

130: Vcom line 132: FPC

135: Short point 140: T_con block

142: Vcom circuit section 150: dummy area

152: inspection pad 162: PCB

Claims (5)

At least one edge portion includes a TFT substrate 110 having a gate IC 112 mounted on a COF 122, a color filter 120 bonded to the TFT substrate 110 to form a liquid crystal panel 100, and In the liquid crystal display device comprising a backlight unit installed on the back of the liquid crystal panel 100, At least one Vcom line 130 of the Vcom lines 130 mounted on the TFT substrate 110 to apply a reference voltage is installed via the COF 122 on which the gate IC 112 is mounted. A liquid crystal display having a narrow beam, characterized in that the gate IC (112) is connected to a short point (135) located at the edge of the mounted region on the substrate (110). The method of claim 1, And the Vcom line (130) is disposed behind the gate IC (112) on the COF (122) on which the gate IC (112) is mounted. The method of claim 1, The Vcom line 130 may be partially mounted on the black matrix 105 region or the glass region on which the gate IC 112 is mounted outside the liquid crystal panel 100. . The method of claim 1, The Vcom line 130 is mounted on the FPC 132 or the PCB 162 to be installed outside the liquid crystal panel 100, and the gate IC 112 is mounted from the FPC 132 or the PCB 162. A liquid crystal display having a narrow beam, which is applied to an outer portion of the liquid crystal panel (100) via a COF (122) to form a short point (135). The method of claim 4, wherein The FPC (132) or the PCB (162) is a liquid crystal display having a narrow beam, characterized in that the power line and signal line for driving the gate IC (112) is mounted together.

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