Patent Publication Number: US-8982144-B2

Title: Multi-primary color display device

Description:
PRIORITY STATEMENT 
     This application claims priority under 35 U.S.C. §119 from Korean Patent Application No. 2011-36201, filed on Apr. 19, 2011 in the Korean Intellectual Property Office (KIPO), the contents of which are herein incorporated by reference in their entirety. 
     BACKGROUND 
     1. Technical Field 
     Exemplary embodiments of the present disclosure are directed to a display device. More particularly, exemplary embodiments of the present disclosure are directed to a multi-primary color display device including a multi-primary subpixel. 
     2. Description of the Related Art 
     In general, a liquid crystal display (LCD) apparatus includes an LCD panel, a data driver and a gate driver. The LCD panel includes an array substrate, a color filter substrate and a liquid crystal layer. The array substrate includes a plurality of data lines, a plurality of gate lines, a plurality of switching elements and a plurality of pixel electrodes. The color filter substrate includes a plurality of color filters and a common electrode facing the pixel electrodes. The liquid crystal layer is disposed between the array substrate and the color filter substrate, and liquid crystals are arranged by an electric field between the pixel electrode and the common electrodes. 
     As described above, to reduce image crosstalk and flicker due to driving the LCD panel, an inversion driving method may be used that reverses a polarity of a data voltage applied to the pixel. 
     In general, the LCD panel has an RGB structure that includes red, green and blue subpixels. An LCD panel having an RGB structure may use a one-dot inversion driving method. In a one-dot inversion driving method, the voltages are applied to the subpixels in an order of positive (+), negative (−), positive (+) and negative (−) voltages. Thus, positive (+) and negative (−) voltages may be uniformly applied to red, green and blue subpixels during one frame. 
     Recently, to improve color reproduction and luminance of an LCD panel, an LCD panel having an RGBW structure including red, green, blue and white subpixels, and a multi-primary color display device including red, green, blue subpixels and an additional color subpixel, such as yellow, cyan or magenta, have been developed. For example, when the one-dot inversion driving method is applied to an LCD panel including red, green, blue and white subpixels arranged in one row, the red subpixels are only provided with the positive (+) voltage, the green subpixels are only provided with the negative (−) voltage, the blue subpixels are only provided with the positive (+) voltage and the white subpixels are only provided with the negative (−) voltage. Therefore, the same color subpixels are provided with the same polarity voltage. However, display deterioration, such as striped patterns due to image crosstalk, may occur. 
     SUMMARY 
     Exemplary embodiments of the present disclosure provide a multi-primary color display device including a multi-primary subpixel which improves display quality and driving reliability. 
     According to an exemplary embodiment of the present disclosure, a multi-primary color display device includes a unit pixel part, a plurality of data lines, a plurality of pads and a plurality of connection lines. The unit pixel part is disposed on a display area and includes at least four subpixels. The data lines extend in a first direction on display area, and are electrically connected to the subpixels. The pads are arranged in a second direction substantially perpendicular to the first direction on a peripheral area surrounding the display area, and are electrically connected to a driving chip. The connection lines connected the plurality of data lines to the plurality of pads disposed on the peripheral area. Each of the connection lines has a same line resistance. 
     In an exemplary embodiment, the unit pixel part may include a red subpixel, a green subpixel, a blue subpixel and a multi-primary subpixel. 
     In an exemplary embodiment, the multi-primary subpixel may represent at least one of white, yellow, cyan or magenta. 
     In an exemplary embodiment, the plurality of data lines includes first, second, third, and fourth data lines. The red subpixel may be electrically connected to the first data line, the green subpixel may be electrically connected to the second data line, the blue subpixel may be electrically connected to the third data line and the multi-primary subpixel may be electrically connected to the fourth data line. 
     In an exemplary embodiment, the plurality of pads includes first, second, third, and fourth pads and the plurality of connection lines includes first, second, third, and fourth connection lines. The first connection line electrically may connect the first data line to the first pad, the second connection line may electrically connect the second data line to the second pad, the third connection line may electrically connect the third data line to the third pad, and the fourth connection line may electrically connect the fourth data line to the fourth pad. 
     In an exemplary embodiment, the first, second, third and fourth pads may be arranged along a diagonal with respect to the first direction. 
     In an exemplary embodiment, each of the first, second, third and fourth pads has a first side and a second side opposite to the first side, the first sides and the second sides of the pads extend parallel with each other along said first direction, and a distance between two adjacent sides in the second direction may be less than a pixel width. 
     In an exemplary embodiment, the first, second, third and fourth pads may be arranged along the first direction. 
     In an exemplary embodiment, the first connection line has a first length and a first width, the second connection line has a second length greater than the first length and a second width greater then the first width, the third connection line has a third length greater than the second length and a third width greater than the second width, and the fourth connection line has a fourth length greater than the third length and a fourth width greater than the third width. 
     In an exemplary embodiment, the driving chip may uniformly provide data voltages of a positive polarity (+) and a negative polarity (−) with respect to a reference voltage to the same color subpixels during one frame. 
     In an exemplary embodiment, the driving chip may provide voltages having an inversion period of positive (+), negative (−), positive (+), negative (−), negative (−), positive (+), negative (−) and positive (+), or negative (−), positive (+), negative (−), positive (+), positive (+), negative (−), positive (+) and negative (−), to the subpixels included in at least two unit pixel parts. 
     According to another exemplary embodiment of the present disclosure, a multi-primary color display device includes a unit pixel part and a plurality of pads. The unit pixel part is disposed on a display area, and includes a red subpixel, a green subpixel, a blue subpixel and at least one multi-primary subpixel. The pads are arranged in first direction on a peripheral area surrounding the display area that are electrically connected to a driving chip and to the subpixels. Each subpixel is associated with a pad. The plurality of pads includes first, second, third, and fourth pads. Each of the first, second, third and fourth pads has a first side and a second side opposite to the first side. The first and second sides of the pads extend parallel with each other along a second direction substantially perpendicular to the first direction, and a distance between two first sides of adjacent pads in the first direction is less than a pixel width. 
     In an exemplary embodiment, the multi-primary color display device may include a plurality of data lines extending in the second direction on the display area that are electrically connected to the subpixels, including first, second, third, and fourth data lines. The red subpixel may be electrically connected to the first data line, the green subpixel may be electrically connected to the second data line, the blue subpixel may be electrically connected to the third data line and the multi-primary subpixel may be electrically connected to the fourth data line. 
     In an exemplary embodiment, the multi-primary color display device may include a plurality of connection lines that includes first, second, third, and fourth connection lines. The first connection line may electrically connect the first data line to the first pad, the second connection line may electrically connect the second data line to the second pad, the third connection line may electrically connect the third data line to the third pad, and the fourth connection line may electrically connect the fourth data line to the fourth pad. Each of the connection lines may have a same line resistance. 
     In an exemplary embodiment, the first connection line may have a first length and a first width, the second connection line may have a second length greater than the first length and a second width greater then the first width, the third connection line may have a third length greater than the second length and a third width greater than the second width, and the fourth connection line may have a fourth length greater than the third length and a fourth width greater than the third width. 
     According to embodiments of the present disclosure, data lines disposed in a display area and pads disposed in a peripheral area are connected to connection lines having the same line resistance, to prevent signal distortion. In addition, the pads are arranged in a plurality of rows so that a contact area of the pads with bumps of the data driving chip may be increased to improve driving reliability. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram illustrating a display device according to an exemplary embodiment of the present disclosure. 
         FIG. 2  is a plan view illustrating a display panel of  FIG. 1 . 
         FIG. 3  is a schematic diagram illustrating the data pad part of  FIG. 2 . 
         FIG. 4  is a schematic diagram illustrating a data pad part according to another exemplary embodiment of the present disclosure. 
         FIG. 5  is a plan view illustrating a display panel according to still another exemplary embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, the present disclosure will be explained in detail with reference to the accompanying drawings. 
       FIG. 1  is a block diagram illustrating a display device according to an exemplary embodiment of the present disclosure. 
     Referring to  FIG. 1 , the display device includes a display panel  100  and a panel driving part  200 . 
     The display panel  100  includes a plurality of unit pixel parts P, a plurality of data lines DL 1 , . . . , DL K  (K is a natural number) extending in a first direction and a plurality of gate lines GL 1 , . . . , GL N  (N is a natural number) extending in a second direction substantially perpendicular to the first direction. According to exemplary embodiments, the plurality of data lines may be arranged in columns, and the plurality of gate lines may be arranged in rows, however, these embodiments are non-limiting, and in other exemplary embodiments, the reverse may be true. Each of the unit pixel parts P includes a main color subpixel and a multi-primary subpixel. The main color subpixel includes red, green and blue subpixels Rp, Gp and Bp, and the multi-primary subpixel Mp may include at least one of a white, yellow, cyan, or magenta subpixel, etc. The white subpixel may be a clear subpixel which lacks a color filter. When the display panel  100  includes the multi-primary subpixels Mp, the multi-primary subpixel may display various colors that improve the display panel luminance and increase the color reproduction range. Each of the subpixels includes a switching element (not shown) connected to the data line and the gate line and a pixel electrode connected to the switching element. 
     Each of the subpixels Rp, Gp, Bp or Mp may have a pixel size corresponding to a pixel area that may be equal to or different from the remaining subpixels. The red subpixel Rp and the blue subpixel Bp may have the same pixel size. The green subpixel Gp and the multi-primary subpixel Mp may have different pixel sizes. The red subpixel Rp may have a greater pixel size than that of each of the green subpixel Grp and the multi-primary subpixel Mp. 
     Each of the subpixels Rp, Gp, Bp and Mp includes an aperture area AA that substantially transmits light. The aperture area AA may be less than or equal to the pixel size of the subpixel. The aperture area AA of at least one of the subpixels may be different from the remaining subpixels. An aperture ratio of at least one of the subpixels may be different from the remaining subpixels. 
     The pixel size and the aperture area of the red subpixel Rp may be greater than or equal to those of each of the blue subpixel Bp, the green subpixel Gp, and the multi-primary subpixel Mp. 
     The pixel size and the aperture area of the blue subpixel Bp may be greater than or equal to those of each of the green subpixel Gp and the multi-primary subpixel Mp. The pixel size and the aperture area of the green subpixel Gp may be greater than or equal to those of the multi-primary subpixel Mp. 
     The pixel size and the aperture area of the multi-primary subpixel Mp may be less than or equal to those of at least one of the red, blue or green subpixels Rp, Gp and Bp. The red subpixel Rp may have the greatest aperture area of the subpixels Rp, Gp, Bp and Mp. The aperture areas of the subpixels Rp, Gp, Bp and Mp may decrease in size in order of the red subpixel Rp, the blue subpixel Bp, the green subpixel Gp and the multi-primary subpixel Mp. 
     In addition, the aperture area at of least one of the red subpixel Rp and the blue subpixel Bp may be greater than the aperture area of the multi-primary subpixel Mp. For example, when the multi-primary subpixel Mp is yellow, the aperture area of least one of the red subpixel Rp and the blue subpixel Bp may be greater than the aperture area of the yellow subpixel. The pixel size and the aperture area of the subpixels Rp, Gp, Bp and Mp are not limited thereto and may be varied to improve white level uniformity or increase the color reproduction range. 
     The panel driving part  200  includes a timing control part  210 , a data rearrangement part  230 , a data driving part  250 , and a gate driving part  270 . 
     The timing control part  210  generates timing signals  211 ,  212  and  213  based on a received synchronization signal SS and uses these timing signals  211 ,  212  and  213  to respectively control a driving timing of the data rearrangement part  230 , the data driving part  250  or the gate driving part  270 . 
     The data rearrangement part  230  generates red, green, blue and multi-primary data  231  using received red, green and blue data DS, rearranges the red, green, blue and multi-primary data  231  according to a subpixel structure of the display panel  100  and outputs the rearranged red, green, blue and multi-primary data  231  to the display panel  100 . 
     The data driving part  250  converts the red, green, blue and multi-primary data into red, green, blue and multi-primary data voltages using gamma voltages. The data driving part  250  outputs data voltages having a first polarity with respect to a reference voltage or a second polarity with respect to the reference voltage. The first polarity may be referred to as a positive polarity (+), the second polarity may be referred to as a negative polarity (−) and the reference voltage may be referred to as a common voltage Vcom. The data driving part  250  outputs to the data lines corresponding to adjacent two unit pixel parts data voltages having a positive (+), negative (−), positive (+), negative (−), negative (−), positive (+), negative (−) and positive (+) inversion period, or a negative (−), positive (+), negative (−), positive (+), positive (+), negative (−), positive (+) and negative (−) inversion period. In addition, the data driving part  250  reverses the data voltages being output for each horizontal period. 
     The gate driving part  270  may generate a plurality of gate signals and may sequentially output the gate signals to the gate lines GL 1 , . . . , GL N . 
       FIG. 2  is a plan view illustrating a display panel of  FIG. 1 . 
     Referring to  FIGS. 1 and 2 , the display panel  100  includes a display area DA and a peripheral areas PA 1 , PA 2  surrounding the display area DA. 
     A plurality of subpixels is disposed on the display area DA. The subpixels include a plurality of main color subpixels and at least one multi-primary subpixel. For example, the main color subpixels may include red, green and blue subpixels and the multi-primary subpixel may include at least one of a white, yellow, cyan or magenta subpixel. 
     Each of the subpixels may include a switching element TR, a pixel electrode PE and a color filter (not shown). The switching element TR is connected to the data line, the gate line and the pixel electrode PE. The color filter may be disposed on an area on which the pixel electrode PE is disposed. The color filter may include main color filters including red, green and blue and a multi-primary filter including at least one of yellow, cyan or magenta. When the multi-primary subpixel is a white subpixel, the color filter may be omitted. 
     For example, the red subpixels in a first red pixel column RC 1  of a first group of columns are electrically connected to a first data line DL 1  and to gate lines GL 1 , . . . , GL N  and each of the red subpixels include a red filter. The green subpixels in a first green pixel column GC 1  of the first group of columns are electrically connected to a second data line DL 2  and to gate lines GL 1 , . . . , GL N  and each of the green subpixels include a green filter. The blue subpixels in a first blue pixel column BC 1  of the first group of columns are electrically connected to a third data line DL 3  and to gate lines GL 1 , . . . , GL N  and each of the blue subpixels include a blue filter. The multi-primary subpixels in a first multi-primary pixel column MC 1  of the first group of columns are electrically connected to a fourth data line DL 4  and to gate lines GL 1 , . . . , GL N  and each of the multi-primary subpixels include a multi-primary filter. 
     The red subpixels in a second red pixel column RC 2  of a second group of columns are electrically connected to a fifth data line DL 5  and to gate lines GL 1 , . . . , GL N  and each of the red subpixels include a red filter. The green subpixels in a second green pixel column GC 2  of the second group of columns are electrically connected to a sixth data line DL 6  and to gate lines GL 1 , . . . , GL N  and each of the green subpixels include a green filter. The blue subpixels in a second blue pixel column BC 2  of the second group of columns are electrically connected to a seventh data line DL 7  and to gate lines GL 1 , . . . , GL N  and each of the second blue subpixels include a blue filter. The multi-primary subpixels in a second multi-primary pixel column MC 2  of the second group of columns are electrically connected to an eighth data line DL 8  and to gate lines GL 1 , . . . , GL N  and each of the second multi-primary subpixels include a multi-primary filter. 
     A data pad part  110  and a plurality of connection lines CL 1 , CL 2 , CL 3 , . . . , are disposed on a first peripheral area PA 1 . The data pad part  110  includes a plurality of data pads  111 ,  112 ,  113 , . . . that are electrically connected to the data driving part  250 . The connection lines CL 1 , CL 2 , CL 3 , . . . connect the data pads  111 ,  112 ,  113 , . . . to the data lines DL 1 , . . . , DLK. The data driving part  250  may be a data driving chip or a tape carrier package (TCP) which includes the data driving chip mounted on a flexible printed circuit board (FPCB). 
     The gate driving part  270  is disposed on a second peripheral area PA 2 . The gate driving part  270  may be a shift-register including a plurality of circuit switching elements and may be formed via substantially a same process as is used to form the switching elements TR of the display area DA. In exemplary embodiment, the gate driving part  270  including the circuit switching elements is disposed on the second peripheral area PA 2 , and a plurality of gate pads electrically connected with a plurality of bumps of the gate driving part may be disposed on the second peripheral area PA 2 . 
     The data pads  111 ,  112 ,  113 , . . . , may be arranged in a plurality of rows corresponding to the number of the subpixels included in a unit pixel part P of the display area PA. When a unit pixel part includes four subpixels, such as red, green, blue and multi-primary subpixels, the data pads are arranged in four rows. Four pads corresponding to the red, green, blue and multi-primary pixel columns of each group may be arranged along a diagonal with respect to the column direction. 
     For example, the data pad part  110  is disposed on the first peripheral area PA 1 . The data pad part  110  includes a first pad  111  connected to the first data line DL 1 , a second pad  112  connected to the second data line DL 2 , a third pad  113  connected to the third data line DL 3 , a fourth pad  114  connected to the fourth data line DL 4 , a fifth pad  115  connected to the fifth data line DL 5 , a sixth pad  116  connected to the sixth data line DL 6 , a seventh pad  117  connected to the seventh data line DL 7 , and an eighth pad  118  connected to the eighth data line DL 8 . 
     The first pad  111  and the fifth pad  115  are arranged in a first row. The second pad  112  and the sixth pad  116  are arranged in a second row located above the first row. The third pad  113  and the seventh pad  117  are arranged in a third row located above the second row. The fourth pad  114  and the eighth pad  118  are arranged in a fourth row located above the third row. 
     The first to fourth pads  111 ,  112 ,  113  and  114  are arranged along a first diagonal, and the fifth to eighth pads  115 ,  116 ,  117  and  118  are arranged along a second diagonal. The first and second diagonals may be parallel to each other. 
     The first and fifth pads  111  and  115  in the first row are separated from pixels in a first pixel row PR 1  of the display area DA by a first distance D 1 . The second and sixth pads  112  and  116  in the second row are separated from pixels in the first pixel row PR 1  by a second distance D 2  greater that the first distance D 1 . The third and seventh pads  113  and  117  in the third row are separated from pixels in the first pixel row PR 1  by a third distance D 3  greater that the second distance D 2 . The fourth and eighth pads  114  and  118  in the fourth row are separated from pixels in the first pixel row PR 1  by a fourth distance D 4  greater that the third distance D 3 . Alternatively, the first and fifth pads  111  and  115  of the first row are vertically separated from a boundary DA_B of the display area DA adjacent to the first pixel row PR 1  by the first distance D 1 . The second and sixth pads  112  and  116  of the second row are vertically separated from the boundary DA_B by the second distance D 2  greater than the first distance D 1 , the third and seventh pads  113  and  117  are vertically separated from the boundary DA_B by the third distance D 3  greater than the second distance D 2 , and the fourth and eighth pads  114  and  118  are vertically separated from the boundary DA_B by the fourth distance D 4  greater than the third distance D 3 . 
     The connection lines includes a first connection line CL 1 , a second connection line CL 2 , a third connection line CL 3 , a fourth connection line CL 4 , a fifth connection line CL 5 , a sixth connection line CL 6 , a seventh connection line CL 7  and an eighth connection line CL 8 . The first connection line CL 1  connects the first data line DL 1  to the first pad  111 , the second connection line CL 2  connects the second data line DL 2  to the second pad  112 , the third connection line CL 3  connects the third data line DL 3  to the third pad  113 , the fourth connection line CL 4  connects the fourth data line DL 4  to the fourth pad  114 , the fifth connection line CL 5  connects the fifth data line DL 5  to the fifth pad  115 , sixth connection line CL 6  connects the sixth data line DL 6  to the sixth pad  116 , the seventh connection line CL 7  connects the seventh data line DL 7  to the seventh pad  117  and the eighth connection line CL 8  connects the eighth data line DL 8  to the eighth pad  118 . 
     In exemplary embodiment, the first connection line CL 1  has a first length D 1 , the second connection line CL 2  has a second length D 2  greater than the first length D 1 , the third connection line CL 3  has a third length D 3  greater than the second length D 2  and the fourth connection line CL 4  has a fourth length D 4  greater than the third length D 3 . 
     The first to fourth connection lines CL 1 , CL 2 , CL 3  and CL 4  each have a different line width to maintain a common line resistance. When a line length of one of the first to fourth connection lines CL 1 , CL 2 , CL 3  and CL 4  is increased, the line width of the lengthened connection line may be increased to maintain the same line resistance. 
     For example, the first connection line CL 1  has a first width W 1 , the second connection line CL 2  has a second width W 2  greater than the first width W 1 , the third connection line CL 3  has a third width W 3  greater than the second width W 2 , and the fourth connection line CL 4  has a fourth width W 4  greater than the third width W 3 . As described above, each of the fifth to eighth connection lines CL 5 , CL 6 , CL 7  and CL 8  also has a different width to maintain the same line resistance. 
     The connection lines connected to the pads arranged in the rows have differing lengths and widths to maintain the same line resistance. Therefore, signal distortion through the data lines may be substantially prevented. 
       FIG. 3  is a schematic diagram illustrating the data pad part of  FIG.2 . 
     Referring to  FIGS. 2 and 3 , the first pad  111 , the second pad  112 , the third pad  113  and the fourth pad  114  respectively corresponding to the red, green, blue and multi-primary pixel columns RC 1 , GC 1 , BC 1  and MC 1  of each group, are arranged along a diagonal. 
     The first to fourth pads  111 ,  112 ,  113  and  114  all have the same size, with each of the first to fourth pads  111 ,  112 ,  113  and  114  having a first side in the column direction and a second side opposite to the first side. In other words, the first to fourth pads  111 ,  112 ,  113  and  114  have the same pad width PW along the row direction, the first pad  111  has first and second sides S 11  and S 12 , the second pad  112  has first and second sides S 21  and S 22 , the third pad  113  has first and second sides S 31  and S 32 , and the fourth pad  114  has first and second sides S 41  and S 42 . 
     The first side S 11  of the first pad  111  and the second side S 22  of the second pad  112  are vertically separated from each other. The first side S 21  of the second pad  112  and the second side S 32  of the third pad  113  are vertically separated from each other. The first side S 31  of the third pad  113  and the second side S 42  of the fourth pad  114  are vertically separated from each other. 
     In exemplary embodiment, the first to fourth pads  111 ,  112 ,  113  and  114  are arranged in four rows along a diagonal so that the size of each of the pads may be increased. Thus, a contact area of the pad with a bump of the data driving part  250  may be increased to improve driving reliability. 
       FIG. 4  is a schematic diagram illustrating a data pad part according to another exemplary embodiment of the present disclosure. 
     Referring to  FIGS. 2 and 4 , the first pad  111 , the second pad  112 , the third pad  113  and the fourth pad  114  respectively corresponding to the red, green, blue and multi-primary pixel columns RC 1 , GC 1 , BC 1  and MC 1  of each group, are arranged along a diagonal. 
     The first to fourth pads  111 ,  112 ,  113  and  114  all have the same pad width PW, the first pad  111  has a first side S 11  and a second side S 12  opposite to the first side S 11 , the second pad  112  has a first side S 21  and a second side S 22  opposite to the first side S 21 , the third pad  113  has a first side S 31  and a second side S 32  opposite to the first side S 31  and the fourth pad  114  has a first side S 41  and a second side S 42  opposite to the first side S 41 . 
     The second side S 22  of the second pad  112  is located on a vertical line displaced from the first side S 11  toward the second side S 12  of the first pad  111  by an overlap distance OD. The first pad  111  and the second pad  112  thus overlap each other by the overlap distance OD. 
     The second side S 32  of the third pad  113  is located on a vertical line displaced from the first side S 21  toward the second side S 22  of the second pad  112  by the overlap distance OD. The second pad  112  and the third pad  113  thus overlap each other by the overlap distance OD. 
     The second side S 42  of the fourth pad  114  is located on a vertical line displaced from the first side S 31  toward the second side S 32  of the third pad  113  by the overlap distance OD. The third pad  113  and the fourth pad  114  thus overlap each other by the overlap distance OD. In other words, the first sides S 11 , S 21 , S 31  and S 41 , and the second sides S 12 , S 22 , S 32  and S 42  of the first to fourth pads  111 ,  112 ,  113  and  114  are respectively located on vertical lines parallel with each other that are separated by a distance less than the pixel width PW. 
     As described above, each of the first to fourth pads  111 ,  112 ,  113  and  114  along a diagonal may overlap an adjacent pad by the overlap distance OD. 
     In exemplary embodiment, the first to fourth pads  111 ,  112 ,  113  and  114  are arranged in four rows along a diagonal so that the size of each of the pads may be increased. Thus, a contact area of the pad with a bump of the data driving part  250  may be increased to improve reliability of the display device. 
     As described in  FIGS. 3 and 4 , the overlap distance OD between the first pad  111  and the second pad  112  adjacent to the first pad  111  may be greater than or equal to 0 and less than or equal to the pad width PW: 0≦OD≦PW. 
       FIG. 5  is a plan view illustrating a display panel according to still another exemplary embodiment of the present disclosure. 
     Referring to  FIGS. 1 and 5 , the display panel  100  may include a display area DA and peripheral areas PA 1  and PA 2  surrounding the display area DA. 
     A plurality of subpixels is disposed on the display area DA. The subpixels include a main subpixel and a multi-primary subpixel. For example, the main color subpixel includes red, green and blue subpixels, and the multi-primary subpixel includes at least one of a white, yellow, cyan or magenta subpixel. 
     Each subpixel includes a switching element TR, a pixel electrode PE and a color filter. The switching element TR is connected to a data line, a gate line and the pixel electrode PE. The color filter is disposed on an area in which the pixel electrode PE is disposed. The color filter may include a main color filter including red, green and blue filters and a multi-primary filter including yellow, cyan or magenta filters. Alternatively, when the multi-primary subpixel is white, the white subpixel may be a clear subpixel that lacks a color filter. 
     For example, the red subpixels in a first red pixel column RC 1  of a first group of columns are electrically connected to a first data line DL 1  and to gate lines GL 1 , . . . , GL N  and each of the red subpixels includes a red filter. The green subpixels in a first green pixel column GC 1  of the first group of columns are electrically connected to a second data line DL 2  and to gate lines GL 1 , . . . , GL N  and each of the green subpixels includes a green filter. The blue subpixels in a first blue pixel column BC 1  of the first group of columns are electrically connected to a third data line DL 3  and to gate lines GL 1 , . . . , GL N  and each of the blue subpixels includes a blue filter. The multi-primary subpixels in a first multi-primary pixel column MC 1  of the first group of columns are electrically connected to a fourth data line DL 4  and to gate lines GL 1 , . . . , GL N  and each of the multi-primary subpixels includes a multi-primary filter. 
     Subpixels included in red, green, blue and multi-primary pixel columns RC 2 , GC 2 , BC 2  and MC 2  of a second group of columns are electrically connected to fifth, sixth, seventh and eighth data lines DL 5 , DL 6 , DL 7  and DL 8 , respectively, and to gate lines GL 1 , . . . , GL N . 
     A data pad part  120  and a plurality of connection lines CL 1 , CL 2 , CL 3 , . . . are disposed on the first peripheral area PA 1 . The data pad part  120  includes a plurality of pads  121 ,  122 ,  123 , . . . electrically connected to the data driving part  250 . The connection lines CL 1 , CL 2 , CL 3 , . . . , connect the pads  121 ,  122 ,  123 , . . . of the data pad part  120  and to data lines DL 1 , . . . , DLK. The data pad part  120  may be disposed on an area in which the data driving part  250  (the data driving chip) is mounted. The gate driving part  270  is disposed on the second peripheral area PA 2 . Alternatively, a plurality of gate pads may be disposed on the second peripheral area PA 2  in contact with a plurality of bumps on a gate driving chip. 
     The data pads may be arranged in a plurality of rows corresponding to the number of the subpixels included in the unit pixel part of the display area DA. 
     For example, when the unit pixel part includes red, green, blue and multi-primary subpixels, i.e., four subpixels, the data pads are arranged in four rows, and four pads corresponding to the red, green, blue and multi-primary pixel columns RC 1 , GC 1 , BC 1  and MC 1  of each group are arranged in a column. 
     The data pad part  120  includes a first pad  121  connected to the first data line DL 1 , a second pad  122  connected to the second data line DL 2 , a third pad  123  connected to the third data line DL 3 , a fourth pad  124  connected to the fourth data line DL 4 , a fifth pad  125  connected to the fifth data line DL 5 , a sixth pad  126  connected to the sixth data line DL 6 , a seventh pad  127  connected to the seventh data line DL 7  and an eighth pad  128  connected to the eighth data line DL 8 . 
     The first and fifth pads  121  and  125  are arranged in a first row. The second and sixth pads  122  and  126  are arranged in a second row above the first row. The third and seventh pads  123  and  127  are arranged in a third row above the second row. The fourth and eighth pads  124  and  128  are arranged in a fourth row above the third row. 
     The first to fourth pads  121 ,  122 ,  123  and  124  are arranged in a first column. The fifth to eighth pads  125 ,  126 ,  127  and  128  are arranged in a second column. The first and second columns may be parallel with each other. 
     The second pad  122  adjacent to the first pad  121  overlaps the first pad  121  by an overlap distance OD equal to the pad width PW so that the first and second pads  121 ,  122  are in a straight column. 
     According to exemplary embodiments described in  FIGS. 3 ,  4  and  5 , the second pad of the second row adjacent to the first row overlaps the first pad by an overlap distance OD which is greater than or equal to 0 and less than or equal to a pad width PW: 0≦OD≦PW. 
     The first and fifth pads  121  and  125  in the first row are separated from a first pixel row PR 1  of the display area DA by a first distance D 1 . The second and sixth pads  122  and  126  in the second row are separated from the first pixel row PR 1  by a second distance D 2  greater than the first distance D 1 . The third and seventh pads  123  and  127  in the third row are separated from the first pixel row PR 1  by a third distance D 3  greater than the second distance D 2 . The fourth and eighth pads  114  and  118  in the fourth row are separated from the first pixel row PR 1  by a fourth distance D 4  greater than the third distance D 3 . Alternatively, the first and fifth pads  121  and  125  of the first row are vertically separated from a boundary DA_B of the display area DA adjacent to the first pixel row PR 1  by the first distance D 1 . The second and sixth pads  122  and  126  of the second row are vertically separated from the boundary DA_B by the second distance D 2  greater than the first distance D 1 , the third and seventh pads  123  and  127  are vertically separated from the boundary DA_B by the third distance D 3  greater than the second distance D 2 , and the fourth and eighth pads  124  and  128  are vertically separated from the boundary DA_B by the fourth distance D 4  greater than the third distance D 3 . 
     The connection lines includes a first connection line CL 1 , a second connection line CL 2 , a third connection line CL 3 , a fourth connection line CL 4 , a fifth connection line CL 5 , a sixth connection line CL 6 , a seventh connection line CL 7  and an eighth connection line CL 8 . The first connection line CL 1  connects the first data line DL 1  to the first pad  121 , the second connection line CL 2  connects the second data line DL 2  to the second pad  122 , the third connection line CL 3  connects the third data line DL 3  to the third pad  123 , the fourth connection line CL 4  connects the fourth data line DL 4  to the fourth pad  124 , the fifth connection line CL 5  connects the fifth data line DL 5  to the fifth pad  125 , sixth connection line CL 6  connects the sixth data line DL 6  to the sixth pad  126 , the seventh connection line CL 7  connects the seventh data line DL 7  to the seventh pad  127 , and the eighth connection line CL 8  connects the eighth data line DL 8  to the eighth pad  128 . 
     In an exemplary embodiment, the first connection line CL 1  has a first length D 1 , the second connection line CL 2  has a second length D 2  greater than the first length D 1 , the third connection line CL 3  has a third length D 3  greater than the second length D 2  and the fourth connection line CL 4  has a fourth length D 4  greater than the third length D 3 . 
     Each of the first to fourth connection lines CL 1 , CL 2 , CL 3  and CL 4  has a different line width to maintain a same line resistance. When a line length of one of the first to fourth connection lines CL 1 , CL 2 , CL 3  and CL 4  is increased, the line width of lengthened connection line may be increased to maintain a same line resistance. For example, the first connection line CL 1  has a first width W 1 , the second connection line CL 2  has a second width W 2  greater than the first width W 1 , the third connection line CL 3  has a third width W 3  greater than the second width W 2 , and the fourth connection line CL 4  has a fourth width W 4  greater than the third width W 3 . As described above, each of the fifth to eighth connection lines CL 5 , CL 6 , CL 7  and CL 8  also has a different width to maintain the same line resistance. 
     According to embodiments of the present disclosure, data lines disposed in a display area and pads disposed in a peripheral area are connected by the connection lines having the same line resistance, to prevent signal distortion. In addition, the pads are arranged in a plurality of rows so that a contact area of the pads with bumps of the data driving part may be increased to improve driving reliability. 
     The foregoing is illustrative of embodiments of the present disclosure and is not to be construed as limiting thereof. Although a few exemplary embodiments of the present disclosure have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and features of the present disclosure. Therefore, it is to be understood that the foregoing is illustrative of the embodiments of the present disclosure and is not to be construed as limited to the specific exemplary embodiments disclosed, and that modifications to the disclosed exemplary embodiments, as well as other exemplary embodiments, are intended to be included within the scope of the appended claims. The present disclosure is defined by the following claims, with equivalents of the claims to be included therein.