Abstract:
The present invention relates to a chip-on-film panel structure, which has a panel body and fan-out leads, first metal sheets, array leads and second metal leads thereon. The array leads are disposed at two sides of the fan-out leads, the second metal sheets are disposed at two sides of the first metal sheets, and the length of each of the second metal sheet is less than the length of each of the first metal sheet to form a lead-out area that the array leads are led out from the second metal sheets via the lead-out area. The chip-on-film panel structure having an arranged fan-out area for array leads can settle the problem of being difficult to narrow the frame of the panel because the array leads occupy available room for fan-out leads and force the fan-out area to expand longitudinally.

Description:
FIELD OF THE INVENTION 
       [0001]    The present invention relates to a design field of panel structure, especially to a chip-on-film panel structure having a lead-out area for array leads. 
       BACKGROUND OF THE INVENTION 
       [0002]    At present, OLB (Out Leader Bonding) technique that is used frequently in liquid crystal display device industry has two types: COF (Chip on Film) and COG (Chip on Glass). Usually, if the OLB technique is applied in COF type, when arranging fan-out leads  110  at the initial stage of panel structure design, the panel using COF type usually needs to have more space (an experience value may be 2 mm) to be reserved at two opposite sides for arranging array leads  130  by a WOA (Wire on Array) lead-arrangement technique (as shown in  FIG. 1 ). The arrangement of the array leads  130  shown in  FIG. 1  on one hand occupies available space of the fan-out leads  110 , and on the other hand it makes the area of the fan-out leads  110  expand in length such that it is difficult to accomplish narrowing the frame of the panel. 
         [0003]    Hence, it is necessary to provide a chip-on-film panel structure to overcome the problems existing in the conventional technology. 
       SUMMARY OF THE INVENTION 
       [0004]    An object of the invention is to provide a chip-on-film panel structure having a lead-out area for array leads to settle the technical problem of a conventional chip-on-film panel structure of being difficult to narrow the frame of the panel because the array leads occupy available room for fan-out leads and force the fan-out area to expand longitudinally. 
         [0005]    In order to settle the aforementioned problems, a technical solution provided by the present invention is as follows: 
         [0006]    The present invention relates to a chip-on-film panel structure, which comprises a panel body, a plurality of fan-out leads mounted on the panel body, a plurality of first metal sheets mounted on the panel body and used to be connected to the fan-out leads, a plurality of array leads mounted on the panel body and a plurality of second metal sheets mounted on the panel body and used to be connected to the array leads, wherein the array leads are disposed at two sides of the fan-out leads, the second metal sheets are disposed at two sides of the first metal sheets, the length of each of the second metal sheets is less than the length of each of the first metal sheets to form a lead-out area, and the array leads are led out from the second metal sheets via the lead-out area; the first metal sheets and the second metal sheets are mounted parallel to each other, and each of the metal sheets has a first end and a second end, wherein the first ends of the first metal sheets are connected to the fan-out leads, the first ends of the second metal sheets are aligned with the first ends of the first metal sheets, and the lead-out area is positioned beside the second ends of the second metal sheets; the array leads are led out from the second ends of the second metal sheets; the length of each of the second metal sheets is ⅓ up to ⅔ of the length of each of the first metal sheets; the width of each of the second metal sheets is greater than the width of each of the first metal sheets; and the area of each of the second metal sheets is determined by the area of each of the first metal sheets. 
         [0007]    The present invention relates to a chip-on-film panel structure, which comprises a panel body, a plurality of fan-out leads mounted on the panel body, a plurality of first metal sheets mounted on the panel body and used to be connected to the fan-out leads, a plurality of array leads mounted on the panel body and a plurality of second metal sheets mounted on the panel body and used to be connected to the array leads, wherein the array leads are disposed at two sides of the fan-out leads, the second metal sheets are disposed at two sides of the first metal sheets, the length of each of the second metal sheets is less than the length of each of the first metal sheets to form a lead-out area, and the array leads are led out from the second metal sheets via the lead-out area. 
         [0008]    In the chip-on-film panel structure of the present invention, the first metal sheets and the second metal sheets are mounted parallel to each other, and each of the metal sheets has a first end and a second end, wherein the first ends of the first metal sheets are connected to the fan-out leads, the first ends of the second metal sheets are aligned with the first ends of the first metal sheets, and the lead-out area is at a position beside the second ends of the second metal sheets; the array leads are led out from the second ends of the second metal sheets. 
         [0009]    In the chip-on-film panel structure of the present invention, the first metal sheets and the second metal sheets are mounted parallel to each other, and each of the metal sheets has a first end and a second end, wherein the first ends of the first metal sheets are connected to the fan-out leads, the second ends of the second metal sheets are aligned with the second ends of the first metal sheets, and the lead-out area is at a position beside the first ends of the second metal sheets; the array leads are led out from the first ends of the second metal sheets. 
         [0010]    In the chip-on-film panel structure of the present invention, the first metal sheets and the second metal sheets are mounted parallel to each other, and each of the metal sheets has a first end and a second end, wherein the first ends of the first metal sheets are connected to the fan-out leads, the lead-out area is at positions respectively beside the first ends and the second ends of the second metal sheets; the array leads are led out from the first ends and the second ends of the second metal sheets. 
         [0011]    In the chip-on-film panel structure of the present invention, the length of each of the second metal sheets is ⅓ up to ⅔ of the length of each of the first metal sheets. 
         [0012]    In the chip-on-film panel structure of the present invention, the length of each of the second metal sheets is ranged from 0.4 to 0.6 mm. 
         [0013]    In the chip-on-film panel structure of the present invention, the width of each of the second metal sheets is greater than the width of each of the first metal sheets. 
         [0014]    In the chip-on-film panel structure of the present invention, the area of each of the second metal sheets is determined by the area of each of the first metal sheets. 
         [0015]    The chip-on-film panel structure of the present invention has following advantages: arranging a lead-out area for array leads can settle the technical problem of a conventional chip-on-film panel structure that the frame of the panel is difficult to be narrowed because the array leads occupy the available room for fan-out leads and make the fan-out area to expand longitudinally. 
         [0016]    This invention is detailed described with reference to the following preferred embodiments and the accompanying drawings, where the aforementioned contents of this invention can be made more clear and understandable. 
     
    
     
       DESCRIPTION OF THE DRAWINGS 
         [0017]      FIG. 1  is a structural scheme view of a conventional chip-on-film panel structure; 
           [0018]      FIG. 2  is a structural scheme view of a first preferred embodiment of a chip-on-film panel structure in accordance with the present invention; 
           [0019]      FIG. 3  is a structural scheme view of a second preferred embodiment of a chip-on-film panel structure in accordance with the present invention; and 
           [0020]      FIG. 4  is a structural scheme view of a third preferred embodiment of a chip-on-film panel structure in accordance with the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0021]    The following embodiments are described with reference to the following accompanying drawings which exemplify the realization of the present invention. In the following drawings, objects in similar structure are marked by same numerals. 
         [0022]      FIG. 2  is a structural scheme view of a first preferred embodiment of a chip-on-film panel structure in accordance with the present invention, and the chip-on-film panel structure comprises a panel body  200  a plurality of fan-out leads  210  mounted on the panel body  200 , a plurality of first metal sheets  220  mounted on the panel body  200  and used to be connected to the fan-out leads  210 , a plurality of array leads  230  mounted on the panel body  200  and a plurality of second metal sheets  240  mounted on the panel body  200  and used to be connected to the array leads  230 . The array leads  230  are positioned at two sides of the fan-out leads  210 , and the second metal sheets  240  are disposed at two sides of the first metal sheets  220 , wherein the length of each of the second metal sheets  240  is less than the length of each of the first metal sheets  220  to form a lead-out area  250  such that the array leads  230  are led out from the second metal sheets  240  via the lead-out area  250 . 
         [0023]    In  FIG. 2 , the first metal sheets  220  and the second metal sheets  240  are mounted parallel to each other. Each of the metal sheets has a first end and a second end. The first ends of the first metal sheets  220  are connected to the fan-out leads  210 . The first ends of the second metal sheets  240  are aligned with the first ends of the first metal sheets  220 . The lead-out area  250  is disposed at a position beside the second ends of the second metal sheets  240 , and the array leads  230  are led out from the second ends of the second metal sheets  240 . 
         [0024]    Because the fan-out leads  210  are to be led out from the first ends of the first metal sheets  220 , if the array leads  230  are led out from the first ends of the second metal sheets  240 , some available room for the fan-out leads  210  will be occupied and the length of the area of the fan-out leads  210  will be increased. The chip-on-film panel structure having the lead-out area  250  can enormously reduce the affection to the available room for the fan-out leads  210  that the leading-out of the array leads  230  may cause. Meanwhile, in this embodiment, the array leads  230  are led out from the second ends of the second metal sheets  240 , the led-out direction thereof is opposite to the led-out direction of the fan-out leads  210 , which sufficiently uses spare room of the panel body  200  to reduce the affection of the array leads  230  causing on the available room for the fan-out leads  210  by the greatest extent. 
         [0025]    In the first preferred embodiment of the chip-on-film panel structure of the present invention, the length of each of the second metal sheets  240  is ⅓ up to ⅔ of the length of each of the first metal sheets  220 , and the length of the second metal sheet  240  is ranged from 0.4 to 0.6 mm. 
         [0026]    The decrement of the lengths of the second metal sheets  240  determines the size of the lead-out area  250 . If the lengths of the second metal sheets  240  are excessive, the size of the lead-out area  250  will be too small and not sufficient for all the array leads  230  to be led out. If the lengths of the second metal sheets  240  are inadequate, the panel body  200  may have too much room that affects the appearance of the panel (each of the metal sheets requires sufficient pressing area and electric conductive particles while executing the chip-on-film bonding process; as the length of the metal sheet is reduced, the width of the metal sheet must be increased correspondingly to ensure the size of the area of the metal sheet (pressing area)). The length of each of the second metal sheets  240  being ⅓ up to ⅔ of the length of each of the first metal sheets  220  (approximately 0.4 to 0.6 mm) ensures the size of the lead-out area  250  and the appearance of the panel body  200 . 
         [0027]      FIG. 3  is a structural scheme view of a second preferred embodiment of a chip-on-film panel structure in accordance with the present invention. In  FIG. 3 , the first metal sheets  320  and the second metal sheets  340  are mounted parallel to each other. Each of the metal sheets has a first end and a second end. The first ends of the first metal sheets  320  are connected to the fan-out leads  310 . The second ends of the second metal sheets  340  are aligned with the second ends of the first metal sheets  320 . The lead-out area  350  is disposed at a position beside the first ends of the second metal sheets  340 , and the array leads  330  are led out from the first ends of the second metal sheets  340 . 
         [0028]    In this embodiment, as aligning the second ends of the second metal sheets  340  with the second ends of the first metal sheets  320  and arranging the lead-out area  350  at the position beside the first ends of the second metal sheets  340 , though the array leads  330  are still led out from the first ends of the second metal sheets  340 , the design of the lead-out area  350  enormously reduces the affection that leading out the array leads  330  may cause on the available room for the fan-out leads  310 . 
         [0029]    As the second preferred embodiment of the chip-on-film panel structure of the present invention, the length of each of the second metal sheets  340  is ⅓ up to ⅔ of the length of each of the first metal sheets  320 , and the length of the second metal sheet  340  is ranged from 0.4 to 0.6 mm. 
         [0030]    The decrement of the lengths of the second metal sheets  340  determines the size of the lead-out area  350 . If the lengths of the second metal sheets  340  are excessive, the size of the lead-out area  350  will be too small and not sufficient for all the array leads  330  to be led out. If the lengths of the second metal sheets  340  are inadequate, the panel body  300  may have too much room that affects the appearance of the panel (each of the metal sheets requires sufficient pressing area and electric conductive particles while executing the chip-on-film bonding process; as the length of the metal sheet is reduced, the width of the metal sheet must be increased correspondingly to ensure the size of the area of the metal sheet (pressing area)). The length of each of the second metal sheets  340  being ⅓ up to ⅔ of the length of each of the first metal sheets  320  (approximately 0.4 to 0.6 mm) ensures the size of the lead-out area  350  and the appearance of the panel body  300 . 
         [0031]      FIG. 4  is a structural scheme view of a third preferred embodiment of a chip-on-film panel structure in accordance with the present invention. In  FIG. 4 , the first metal sheets  420  and the second metal sheets  440  are mounted parallel to each other. Each of the metal sheets has a first end and a second end. The first ends of the first metal sheets  420  are connected to the fan-out leads  410 . The lead-out area  450  is disposed at both positions beside the first ends and the second ends of the second metal sheets  440 , and the array leads  430  are led out both from the first ends and the second ends of the second metal sheets  440 . 
         [0032]    In this embodiment, as the lead-out area  450  is disposed at positions beside the first ends and the second ends of the second metal sheets  440 , the array leads  430  can be selectively led out from the first ends or the second ends of the second metal sheets  440  according to specific requirements. No matter which ends of the second metal sheets  440  the array leads  430  are led from, the design of the lead-out area  450  will reduce the affection that leading out the array leads  430  may cause on the available room for the fan-out leads  410 . 
         [0033]    As the second preferred embodiment of the chip-on-film panel structure of the present invention, the length of each of the second metal sheets  440  is ⅓ up to ⅔ of the length of each of the first metal sheets  420 , and the length of the second metal sheet  440  is ranged from 0.4 to 0.6 mm. 
         [0034]    The decrement of the lengths of the second metal sheets  440  determines the size of the lead-out area  450 . If the lengths of the second metal sheets  440  are excessive, the size of the lead-out area  450  will be too small and not sufficient for all the array leads  430  to be led out. If the lengths of the second metal sheets  440  are inadequate, the panel body  400  may have too much room left that affects the appearance of the panel (each of the metal sheets requires sufficient pressing area and electric conductive particles while executing the chip-on-film bonding process; as the length of the metal sheet is decreased, the width of the metal sheet must be increased correspondingly to ensure the size of the area of the metal sheet (pressing area)). The length of each of the second metal sheets  440  being ⅓ up to ⅔ of the length of each of the first metal sheets  420  (approximately 0.4 to 0.6 mm) ensures the size of the lead-out area  450  and the appearance of the panel body  400 . 
         [0035]    As the preferred embodiment of the chip-on-film panel structure of the present invention, the width of each of the second metal sheets is greater than the width of each of the first metal sheets, and the area of each of the second metal sheets is determined by the area of each of the first metal sheets. 
         [0036]    The chip-on-film panel structure of the present invention increases the width of each of the second metal sheets while forming the lead-out area by reducing the lengths of the second metal sheets, and thereby ensures that each second metal sheet has sufficient area and electric conductive particles for bonding operation. When the area of each of the second metal sheets is substantially equal to the area of each of the first metal sheets, it will achieve the same bonding effect as conventional second metal sheets may achieve in the prior art. 
         [0037]    By means of the arrangement of the lead-out area, the chip-on-film panel structure of the present invention does not need to reserve in advance or reduce the room for arranging the array leads, such that the length of the fan-out area can be shortened and the frame of the panel can be further narrowed. 
         [0038]    In conclusion, although a few embodiments of the present invention have been disclosed, the above preferred embodiments are not used for limiting this invention, and it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention. The invention is intended to be limited only by the appended claims.