Patent Abstract:
Provided is a driver IC chip of a liquid crystal display (LCD). The driver IC chip has a layout of power pads, which may uniformly apply an adhesive force on the entire adhesion surface of the driver IC chip, when the driver IC chip is mounted on a display panel according to a chip-on-glass (COG) technique.

Full Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation-in-part application of U.S. patent application Ser. No. 12/997,206, filed Dec. 9, 2010 (now pending), the disclosure of which is herein incorporated by reference in its entirety. The U.S. patent application Ser. No. 12/997,206 is a national entry of International Application No. PCT/KR2009/002692, filed on May 22, 2009, which claims priority to Korean Application No. 10-2008-0056179 filed on Jun. 16, 2008, the entire contents of which are incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a driver IC chip, and more particularly, to a driver IC chip and a pad layout method thereof, which are capable of improving adhesion performance of a driver IC mounted through a chip-on-glass (COG) technique. 
         [0004]    2. Description of the Related Art 
         [0005]    Liquid crystal displays (LCD) refer to devices which displays image data by passing light through liquid crystal, using a characteristic that the alignment state of liquid crystal molecules differ depending on an applied voltage. Recently, a thin film transistor (TFT) LCD has been most actively used among the devices. The TFT LCD is fabricated through a technology for fabricating a silicon IC circuit. 
         [0006]    The above-described LCD is an example of flat panel display devices which may include an organic light emitting diode (OLED) and the like. 
         [0007]      FIG. 1  schematically illustrates the structure of a conventional LCD as an example of flat panel displays. 
         [0008]    The TFT LCD includes a TFT array substrate and a color filter substrate which face each other and are bonded to each other with a predetermined space provided therebetween. The TFT LCD further includes an LCD panel  30  formed by injecting an liquid crystal layer into the predetermined space and a driving circuit for driving the LCD panel  30 . 
         [0009]    The driving circuit includes a gate driver IC  40 , a source driver IC  20 , a timing control unit  10 , and a power supply unit (not illustrated). The gate driver IC  40  is configured to sequentially apply a scanning signal to gate lines at each frame, the source driver IC  20  is configured to drive a source line in response to the scanning signal of the gate driver IC  40 , the timing control unit  10  is configured to control the gate driver IC  40  and the source driver IC  20  and output pixel data, and the power supply unit is configured to supply various voltages used in the LCD. 
         [0010]    In general, a method for connecting the driver IC to the LCD panel may include a tape automated bonding (TAB) method and a COG method. According to the TAB method, a driver IC is mounted on a thin flexible film made of polymer, that is, a tape carrier package (TCP), and the film is connected to the LCD so as to electrically connect between the driver IC and the LCD panel. According to the COG method, the driver IC is directly mounted and connected on a glass substrate of a LCD panel through a bump. 
         [0011]    Conventionally, the TAB method has been frequently used because the TAB method has reliable connection and may be easily improved. Recently, however, with the development of micro mounting technology, the COG method has been mainly used because the COG method is favorable to miniaturization and has a low fabrication cost. 
         [0012]    According to the COG method, an output electrode of a driver IC is directly connected to a pad so as to integrate a substrate and the driver IC. In the COG method, a bump and the pad are bonded through conductive particles positioned between the bump and the pad. 
         [0013]    Furthermore, driver IC chips mounted on an LCD panel are connected to each other according to a line-on-glass (LOG) method in which signal lines are directly mounted on a TFT array substrate, and receive a control signal and driving voltages from a timing control unit and a power supply unit. 
         [0014]      FIG. 2  illustrates the pad layout of a conventional driver IC chip that is mounted according to the COG method. 
         [0015]    Referring to  FIG. 2 , the driver IC chip may be formed in a rectangular shape having longitudinal sides and transverse sides on the basis of characteristics of a flat panel display device such as an LCD application. 
         [0016]    The conventional driver IC chip  200 , which is mounted according to the COG method, includes an internal circuit  210  disposed between the longitudinal sides facing each other, an input pad  220  between the internal circuit  210  and one of the longitudinal sides, and an output pad  230  disposed between the internal circuit  210  and the other of the longitudinal sides. The driver IC chip  200  may further include a plurality of power pads  241   a  to  241   d  and  242   a  to  242   d  and the like, which are disposed therein. Reference numerals  251  and  252  represent power lines formed on glass. 
         [0017]    When all of the internal circuit, the input pad, the output pad, the power pads and the like are designed in the driver IC chip of the flat panel display device, the area of the driver IC chip must be increased. As the area of the driver IC chip is increased, the utilization efficiency of glass may be reduced. 
         [0018]    Thus, according to the conventional method, when a source driver IC chip and a gate driver IC chip are designed, power pads are disposed at the input pad of the source driver IC chip and the gate driver IC chip, in order to reduce an area occupied by power lines and ground lines. Alternatively, the power pads may be disposed at a left or right side surface A of the source driver IC chip and the gate driver IC chip. 
         [0019]    When the power pads are disposed at the input pad or the side surface A of the source driver IC chip and the gate driver IC chip, a force (adhesive force) for bonding the driver IC chip  200  on glass according to the COG method may not be uniformly applied onto the entire adhesion surface of the driver IC chip  200 . That is, when the power pads exist only at the input pad, an adhesive force of the input pad section may be larger than an adhesive force of the output pad section. Thus, an electrical connection state of the output pad section having a relatively small adhesive force may be degraded. As a result, an image defect may occur. On the other hand, when the adhesive force of the output pad section is larger than the adhesive force of the input pad section, an electrical connection state of the power pads of the input pad section having a relatively small adhesive force may be degraded. As a result, image noise or frequency defect may occur. 
         [0020]    In the source driver IC chip and the gate driver IC chip, the adhesive force may not be uniformly applied because of the structural problem of the pad layout, and an image defect or frequency defect may occur due to the non-uniform adhesive force. 
       SUMMARY OF THE INVENTION 
       [0021]    Accordingly, the present invention has been made in an effort to solve the problems occurring in the related art, and an object of the present invention is to provide a driver IC chip and a pad layout method thereof, which is capable of uniformly applying an adhesive force onto an adhesion surface of a driver IC chip mounted on a flat panel display device according to a COG method. 
         [0022]    Another object of the present invention is to provide a driver IC chip and a pad layout method thereof, which applies dummy pads for improving an adhesive force of an adhesion surface of a driver IC chip mounted on a flat panel display device according to a COG method. 
         [0023]    In order to achieve the above object, according to one aspect of the present invention, there is provided a driver IC chip including: an input pad section disposed in a longitudinal direction at one of two longitudinal sides of the driver IC chip; an output pad section disposed in the longitudinal direction at the other of two longitudinal sides of the driver IC chip; a first power pad section disposed between an end portion of the input pad section in the longitudinal direction and an end portion of the driver IC chip corresponding to the end portion of the input pad section; a second power pad section disposed between another end portion of the input pad section in the longitudinal direction and an end portion of the driver IC chip corresponding to the another end portion of the input pad section; a third power pad section disposed between an end portion of the output pad section in the longitudinal direction and an end portion of the driver IC chip corresponding to the end portion of the output pad section; and a fourth power pad section disposed between another end portion of the output pad section in the longitudinal direction and an end portion of the driver IC chip corresponding to the another end portion of the output pad section. 
         [0024]    According to another aspect of the present invention, there is provided a driver IC chip including: an input pad section disposed at one longitudinal side of a rectangular adhesion surface and including one or two or more input pads arranged in a longitudinal direction; an output pad section disposed at the other longitudinal side of the adhesion surface so as to face the input pad section and including two or more output pads arranged in the longitudinal direction; a first power pad section including first power pads arranged at both sides of the input pad section in the longitudinal direction at the one longitudinal side, the first power pads are arranged seriately to the input pad section; and a second power pad section including second power pads arranged at both sides of the output pad section in the longitudinal direction at the other longitudinal side and providing an adhesive force corresponding to the first power pad section, the second power pads are arranged seriately to the output pad section. 
         [0025]    According to another aspect of the present invention, there is provided a pay layout method of a driver IC chip, including: arranging one or two or more input pads in a longitudinal direction at the center of one longitudinal side of a rectangular adhesion surface so as to form an input pad section; arranging two or more output pads in the longitudinal direction at positions of the other longitudinal side of the adhesion surface, corresponding to the input pads, so as to form an output pad section; arranging first power pads at both sides of the input pad section in the longitudinal direction at the one longitudinal side so as to form a first power pad section, the first power pads are arranged seriately to the input pad section; and arranging second power pads at both sides of the output pad section in the longitudinal direction at the other longitudinal side so as to form a second power pad section for providing an adhesive force corresponding to the first power pad, the second power pads are arranged seriately to the output power pad section. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0026]    The above objects, and other features and advantages of the present invention will become more apparent after a reading of the following detailed description taken in conjunction with the drawings, in which: 
           [0027]      FIG. 1  schematically illustrates the structure of a conventional LCD as an example of flat panel displays; 
           [0028]      FIG. 2  illustrates the pad layout of a conventional driver IC chip that is mounted according to a COG method; 
           [0029]      FIG. 3  illustrates a driver IC chip according to an embodiment of the present invention; and 
           [0030]      FIG. 4  illustrates a driver IC chip according to another embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0031]    Reference will now be made in greater detail to a preferred embodiment of the invention, an example of which is illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings and the description to refer to the same or like parts. 
         [0032]      FIG. 3  illustrates a pad layout of a driver IC chip according to an embodiment of the present invention. The driver IC chip according to the embodiment of  FIG. 3  may be used as a gate driver IC chip or source driver IC chip used in a flat panel display such as an LCD or OLED. The driver IC according to the embodiment of  FIG. 3  is based on a COG method in which a driver IC is mounted on glass (not illustrated), and the glass may correspond to glass constituting an LCD panel. 
         [0033]    Referring to  FIG. 3 , the driver IC chip  300  according to the embodiment of the present invention includes a plurality of pads formed on an adhesion surface which is bonded to power lines over the glass through a bump. The pads may be divided into an input pad section  320 , an output pad section  330 , and a plurality of power pads  341  to  346 . Furthermore, the adhesion surface of the driver IC chip  300  indicates a surface on which the plurality of pads are formed and which faces the glass when the driver IC chip  300  is bonded according to the COG method. The adhesion surface of the driver IC chip  300  is represented by the same reference numeral as the driver IC chip  300 , for convenience of description. 
         [0034]    The driver IC chip  300  includes an internal circuit  310  disposed in the center thereof. The internal circuit  310  is mounted inside a package. The internal circuit  310  of  FIG. 3  represents a plan position corresponding to the adhesion surface. Furthermore, the plurality of pads according to the embodiment of  FIG. 3  may be formed to be exposed to the adhesion surface facing the glass, for the adhesion through bumps. 
         [0035]    According to the embodiment of  FIG. 3 , the input pad section  320  is disposed in a longitudinal direction at one of two longitudinal sides of the adhesion surface of the driver IC chip  300 , and the output pad section  330  is disposed in the longitudinal direction at the other of two longitudinal sides. The input pad section  320  is used as a terminal to receive an external signal such as data or a control signal, and the output pad section  330  is used as a terminal to output a signal processed in the driver IC chip  300 . The signal outputted from the output pad section  330  may include a source driving signal in the case of a source driver IC chip and a gate driving signal in the case of a gate driver IC circuit. The input pad section  320  and the output pad section  320  may be disposed in areas deviating from the internal circuit  310  and adjacent to the respective longitudinal sides. Furthermore, the input pad section  320  may include one or more input pads arranged to have the same structure or a symmetrical structure with respect to the center of the longitudinal side, and the output pad unit  330  may include one or more output pads arranged to have the same structure or a symmetrical structure with respect to the center of the longitudinal side. 
         [0036]    According to the embodiment of the present invention, the power pads are disposed at the two longitudinal sides of the adhesion surface of the driver IC chip  300 , where the input pad section  320  and the output pad section  330  are disposed or the two longitudinal sides and two transverse sides of the driver IC chip  300 , unlike the conventional driver IC chip in which the power pads are disposed only at the input pad section or the side surface of the driver IC chip  300 . 
         [0037]      FIG. 3  illustrates that the power pads are disposed at the two longitudinal sides and the two transverse sides of the driver IC chip  300 . The power pads  341   a  to  341   d  disposed at one side of the input pad section  320  positioned at one of the two longitudinal sides of the adhesion surface are referred to as a first power pad section  341 , the power pads  342   a  to  342   d  disposed at another side of the input pad section  320  positioned at the one of the two longitudinal sides of the adhesion surface are referred to as a second power pad section  342 , the power pads  343   a  to  343   d  disposed at one side of the output pad section  330  positioned at the other of the two longitudinal sides of the adhesion surface are referred to as a third power pad section  343 , and the power pads  344   a  to  344   d  disposed at another side of the output pad section  330  positioned at the other of the two longitudinal sides of the adhesion surface are referred to as a fourth power pad section  344 . Furthermore, the power pads  345   a  to  345   d  and the power pads  355   a  to  355   d  disposed at the transverse sides in both sides of the adhesion surface are referred to as fifth and sixth power pad sections  345  and  346 , respectively. 
         [0038]    The first power pad section  341  is disposed at an area closer to an end portion of the input pad section  320  in the longitudinal direction than an end portion of the driver IC chip  300  corresponding to the end portion of the input pad section  320  in the longitudinal direction, the second power pad section  342  is disposed at an area closer to another end portion of the input pad section  320  in the longitudinal direction than an end portion of the driver IC chip  300  corresponding to the another end portion of the input pad section  320  in the longitudinal direction. The third power pad section  343  is disposed at an area closer to an end portion of the output pad section  330  in the longitudinal direction than an end portion of the driver IC chip  300  corresponding to the end portion of the output pad section  320  in the longitudinal direction. The fourth power pad section  344  is disposed at an area closer to another end portion of the output pad section  330  in the longitudinal direction than the end portion of the driver IC chip  300  corresponding to the another end portion of the output pad section  330  in the longitudinal direction. 
         [0039]    The respective power pads of the first to sixth power pad sections  341  to  346  may be electrically connected to power lines  351  to  356  for supplying power, and the power lines  351  to  356  may include power lines formed on glass according to the LOG method. That is, the power pads at the longitudinal sides and the power pads at the transverse sides may be connected through the power lines formed in the LOG method so as to bypass the driver IC chip  300 . 
         [0040]    The first to sixth power pad section  341  to  346  may include the first power pads  341   a  to  346   a  for supplying a first power VDD, the second power pads  341   b  to  346   b  for supplying a second power VSS 1 , the third power pads  341   c  to  346   c  for supplying a third power VCC, and the fourth power pads  341   d  to  346   d  for supplying a fourth power VSS 2 . 
         [0041]    At this time, the first power VDD may be used as a power supply voltage for processing a digital signal, the second power VSS 1  may be used as a ground voltage for processing a digital signal, the third power VCC may be used as a power supply voltage for processing an analog signal, and the fourth power VSS 2  may be used as a ground voltage for processing an analog signal. 
         [0042]    The first power pad section  341  formed at one end portion of the input pad section  320  in the longitudinal direction on the adhesion surface of the driver IC chip  300  is electrically connected to the fifth power pad section  345  positioned at an area closer to the first power pad section  341  between the fifth and sixth power pad sections  345  and  346  disposed at both sides of the adhesion surface of the driver IC chip  300 . At this time, a first power pad  341   a  of the first power pad section  341  and a first power pad  345   a  of the fifth power pad section  345  are connected through a first power pad connection line  361   a , and a second power pad  341   b  of the first power pad section  341  and a second power pad  345   b  of the fifth power pad section  345  are connected through a second power pad connection line  361   b.    
         [0043]    The third power pad section  343  formed at one end portion of the output pad section  330  in the longitudinal direction on the adhesion surface of the driver IC chip  300  is electrically connected to the fifth power pad section  345  positioned at an area closer to the third power pad section  343  between the fifth and sixth power pad sections  345  and  346  disposed at both sides of the adhesion surface of the driver IC chip  300 . At this time, a third power pad  343   c  of the first power pad section  343  and a third power pad  345   c  of the third power pad section  345  are connected through a third power pad connection line  361   c , and a fourth power pad  343   d  of the first power pad section  343  and a fourth power pad  345   d  of the fifth power pad section  345  are connected through a fourth power pad connection line  361   d.    
         [0044]    The first power pad connection line  361   a,  the second power pad connection line  361   b,  the third power pad connection line  361   c , and the fourth power pad connection line  361   d  may be formed on glass according to the LOG method or formed in the driver IC  300 . 
         [0045]    The second power pad section  342  formed at another end portion of the input pad section  320  in the longitudinal direction on the adhesion surface of the driver IC chip  300  is connected to the sixth power pad section  346  positioned at an area closer to the second power pad section  342  between the fifth and sixth power pad sections  345  and  346  disposed at both sides of the driver IC chip  300 . At this time, a first power pad  342   a  of the second power pad section  342  and a first power pad  346   a  of the sixth power pad section  346  are connected through a first power pad connection line  362   a , and a second power pad  342   b  of the second power section  342  and a second power pad  346   b  of the sixth power pad section  346  are connected through a second power pad connection line  362   b.    
         [0046]    The fourth power pad section  344  formed at another end portion of the output pad section  330  in the longitudinal direction on the adhesion surface of the driver IC  300  is connected to the sixth power pad section  346  positioned at an area closer to the fourth power pad section  344  between the fifth and sixth power pad sections  345  and  346  disposed at both sides of the driver IC chip  300 . At this time, a third power pad  344   c  of the fourth power pad section  344  and a third power pad  346   c  of the sixth power pad section  346  are connected through a third power pad connection line  362   c , and a fourth power pad  344   d  of the fourth power pad section  344  and a fourth power pad  346   d  of the sixth power pad section  346  are connected through a fourth power pad connection line  362   d.    
         [0047]    The first power pad connection line  362   a , the second power pad connection line  362   b , the third power pad connection line  362   c , and the fourth power pad connection line  362   d  may be formed on glass according to the LOG method or formed in the driver IC chip  300 . According to the embodiment of  FIG. 3 , the first and second power pad sections  341  and  342  are formed at one longitudinal side of the adhesion surface of the driver IC chip  300 , where the input pad section  320  is formed, and the third and fourth power pads sections  343  and  344  for providing an adhesive force corresponding to the adhesive force of the first and second power pad sections  341  and  342  are formed at the other longitudinal side where the output pad section  330  is formed. Thus, according to the embodiment of  FIG. 3 , the adhesive force of the adhesion surface may be uniformly applied to the entire surface. 
         [0048]    Furthermore, according to the embodiment of  FIG. 3 , the fifth and sixth power pad sections  345  and  346  are formed at two transverse sides of the adhesion surface of the driver IC chip  300 . Thus, the adhesive force of the adhesion surface may be more uniformly applied to the entire surface. 
         [0049]    The embodiment of the present invention may be configured as illustrated in  FIG. 4 . 
         [0050]    According to the embodiment of  FIG. 4 , an input pad IN constituting an input pad section  420  is formed at one of two longitudinal sides of a rectangular adhesion surface of a driver IC chip  400 , and four output pads OUT constituting an output pad section  430  are formed at the other of the two longitudinal sides.  FIG. 4  illustrates that the input pad section  420  include one input pad IN. However, the present invention is not limited thereto, but the input pad section  420  may include a plurality of input pads IN arranged in the longitudinal direction. Furthermore,  FIG. 4  illustrates that the output pad section  430  includes four output pads OUT. However, the present invention is not limited thereto, but the output pad section  430  may include two or more output pads arranged in the longitudinal direction. 
         [0051]    The input pad section  420  and the output pad section  430  may be configured to have the same or a symmetrical structure with respect to the center of the longitudinal side, and may have different lengths from each other. The length difference between the input pad section  420  and the output pad section  430  may cause a difference in adhesive force. The difference in adhesive force, caused by the length difference between the input pad section  420  and the output pad section  430 , may be compensated for by dummy pads DM formed in the first power pad section  440 . 
         [0052]    The embodiment of  FIG. 4  includes a first power pad section  440  formed at the one of the two longitudinal sides. The first power pad section  440  includes first power pads VCC, VSS 2 , and DM arranged at both sides of the input pad section  420  in the longitudinal direction. The first power pads VCC, VSS 2 , and DM of the first power pad section  440  may be arranged seriately to the input pad section  430 . 
         [0053]    Furthermore, the embodiment of  FIG. 4  includes a second power pad section  450  formed at the other of the two longitudinal sides. The second power pad section  450  includes second power pads VCC, VDD, VSS 1 , VSS 2 , and DM arranged at both sides of the output pad section  430  in the longitudinal direction. The second power pads VCC, VDD, VSS 1 , VSS 2 , and DM of the second power pad  450  may be arranged seriately to the power pad section  430 , in order to provide an adhesive force corresponding to the first power pad section  440 . 
         [0054]    In the embodiment of  FIG. 4 , the first power pads of the first power pad section  440  include one or more power pads VCC for a power supply voltage for processing an analog signal, one or more power pads VSS 2  for a ground voltage for processing an analog signal, and one or more dummy pads DM. Furthermore, the second power pads of the second power pad  450  include one or more power pad VDD for a power supply voltage for processing a digital signal, one or more power pads VCC 1  for a ground voltage for processing a digital signal, a power pad VCC for a power supply voltage for processing an analog signal, a power pad VSS 2  for a ground voltage for processing an analog signal, and one or more dummy pads DM. 
         [0055]    The number of the first power pads VCC, VSS 1  and DM of the first power pad section  440  and the number of the second power pads VCC, VDD, VSS 1 , VSS 2  and DM of the second power pad section  450  may be set to be equal to each other, in order to uniformize the adhesive force. Furthermore, the first power pad section  440  and the second power section  450  may have the same structure or a symmetrical structure.  FIG. 4  illustrates a symmetrical structure. 
         [0056]    Furthermore, the first power pads VCC, VSS 1  and DM of the first power pad section  440  and the second power pads VCC, VDD, VSS 1 , VSS 2  and DM of the second power pad section  450  may be arranged to the have the same structure or a symmetrical structure with respect to the center of the longitudinal side, in order to equalize the adhesive force. The embodiment of  FIG. 4  has a symmetrical structure. 
         [0057]    As described above, the first and second power pad sections  440  and  450  include one or more dummy pads DM. The dummy pads DM are formed to compensate for a pattern such that the first and second power pad sections  440  and  450  arranged to have the same structure or a symmetrical structure. The dummy pads DM may be arranged symmetrically with respect to the center of the longitudinal side in one or more of the first and second power pad sections  440  and  450 . Furthermore, the first power pad section  440  may include a dummy pad DM formed in an area adjacent to the input pad section  420  so as to compensate for a length difference between the input pad section  420  and the output pad section  430 . 
         [0058]    The first and second power pad sections  440  and  450  may include one or more power pads formed in an area divided on the basis of the center of the longitudinal side and configured to provide the same power. 
         [0059]    A pad layout method for forming the embodiment of  FIG. 4  includes arranging one or two or more input pads at one longitudinal side of a rectangular adhesion surface in a longitudinal direction so as to form the input pad section  420 ; 
         [0060]    arranging two or more output pads at positions of the other longitudinal side of the adhesion surface, corresponding to the input pads, in the longitudinal direction so as to form the output pad section  430 ; and arranging first power pads formed at the one longitudinal side so as to form the first power pad section  440 , such that the first power pads are arranged seriately to the input pad at both sides of the input pad section  420  in the longitudinal direction; and arranging second power pads formed at the other longitudinal side so as to form the second power pad section  450  for providing an adhesive force corresponding to the first power pad section  440 , such that the second power pads are are arranged seriately to the output pads at both sides of the output pad section  430  in the longitudinal direction. 
         [0061]    The embodiment of  FIG. 4  may include a third power pad section  460  and a fourth power pad section  470  which are formed at transverse sides in both sides of the adhesion surface of the driver IC chip  400 , and the third and fourth power pad section  460  and  470  include four power pads VDD, VSS 1 , VCC and VSS 2  as third and fourth power pads, respectively. The embodiment of  FIG. 4  may have an adhesive force increased by the third and fourth power pad sections  460  and  470 . As a result, a uniform adhesive force may be applied to the adhesion surface of the driver IC chip  400 . 
         [0062]    The third power pads VDD, VSS 1 , VCC and VSS 2  of the third power pad section  460  and the fourth power pads VDD, VSS 1 , VCC and VSS 2  of the fourth power pad section  470  may be arranged symmetrically with respect to the center of the longitudinal side. 
         [0063]    In the embodiment of  FIG. 4 , power pads at one side of the center of the first and second power pad sections  440  and  450  may be electrically connected to the power pads of the third power pad section  460  through a first power pad connection line (not illustrated). Furthermore, power pads at the other side of the center of the first and second power pad sections  440  and  450  may be electrically connected to the power pads of the fourth power pad section  470  through the second power pad connection line (not illustrated). The first and second power pad connection lines may be formed in an LOG type so as to bypass the driver IC chip. 
         [0064]    As described above with reference to  FIGS. 3 and 4 , the adhesive force may be uniformly applied onto the entire surfaces of the driver IC chips  300  and  400 . Thus, it is possible to prevent an image defect, image noise or noise defect which may occur due to an adhesion defect, when the driver IC chips  300 ,  400  is bonded according to a COF method. 
         [0065]    Furthermore, the power pads are formed at four sides of the driver IC chips  300  and  400 . Thus, the embodiments of the present invention not only may uniformly provide an adhesive force for four sides, but also may provide power according to various mounting methods. 
         [0066]    The embodiments of the present invention may be applied to a panel for a source driver IC cascade type COG, a GIP (Gate In Panel) for a source driver IC cascade type COG, and an LCD module or LCD display system fabricated using the panel. 
         [0067]    According to the embodiments of the present invention, the adhesion surface of the driver IC chip mounted on a flat panel display device according to the COG method may have a uniform adhesive force through the pads which are uniformly distributed at the longitudinal sides or transverse sides. Thus, the adhesion state between the driver IC chip and the glass may be improved, and an image defect, image noise and frequency defect may be prevented. 
         [0068]    Although a preferred embodiment of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and the spirit of the invention as disclosed in the accompanying claims.

Technology Classification (CPC): 8