Abstract:
This present invention provides a flexible LED display by utilizing flexible wirings and the locations of the conductive pins on the bottom side of each single color LEDs or full color LEDs to make each of the single color LEDs or full color LEDs mount on each pixel defined by the flexible wires formed on the transparent flexible substrate, and this flexible LED display which characterizes in separating the wirings crossing over with each other by a so-called bridge technology and utilizing a single-layered substrate to save costs of processes and materials.

Description:
[0001]    This application claims the benefit of TW Invention Patent Application No._104,132,015 filed on Sep. 30, 2015 and TW Utility Model Patent Application No. 104,215,650 filed on Sep. 30, 2015, the entirety of which are incorporated by reference herein. 
       BACKGROUND OF THE INVENTION 
       [0002]    Field of the Invention 
         [0003]    The present invention relates to a matrix display, and in particular relates to a flexible LED display. 
         [0004]    Description of the Related Art 
         [0005]    Recently, a flexible display made of plastic and having light weight and anti-shock properties have been developed. The portability can be maximized by folding or rolling up the flexible display. Meanwhile, this flexible display can be used in many fields such as electronic billboards, window banners, exhibition bulletin boards, and so on. 
         [0006]    A conventional flexible display comprises a display device formed on a flexible substrate, wherein various display device can be chosen, such as OLED, LCD or EPD. The displays mentioned above usually comprise thin film transistors, so lots of thin film processes are necessary to form thin film transistors on a flexible substrate to generate a flexible display device. However, the flexible substrate having a thickness of about tens nm is too thin to proceed various thin film processes. Currently, a new method of manufacturing a flexible display was provided, wherein a flexible substrate was formed on a glass substrate in advance, then a display device was formed on the flexible substrate adhered on the glass substrate, then the flexible substrate and the glass substrate was separated. The thermal expansion coefficients (CTE) of flexible substrate made of plastic materials and the glass substrate are different. The flexible substrate and the glass substrate can be easily separated or bending during high temperature process when the bonding force therebetween is weak and results in serious defects. In addition, the conventional single-layered or double-layered flexible LED display is restricted in the wiring design, so the single color (two conductive pad) LEDs are chosen instead of full color LEDs for full color display. Accordingly, the applications of LED displays are still not popular. 
         [0007]    In accordance, a new and convenient method of manufacturing a full color flexible display which can overcome above disadvantages is highly expected. This present invention provides a flexible LED display by utilizing flexible wirings and the locations of the conductive pins on the bottom side of each single color LEDs or full color LEDs to make each of the single color LEDs or full color LEDs mount on each pixel defined by the flexible wires formed on the transparent flexible substrate. Furthermore, this present invention provide a flexible LED display which characterizes in separating the wirings crossing over with each other by a so-called bridge technology and utilizing a single-layered substrate to save costs of processes and materials. 
       SUMMARY OF THE INVENTION 
       [0008]    An aspect of this present invention provides a flexible LED display, comprising: a transparent flexible substrate having a top surface and a bottom surface opposite to each other; 3M columns of first flexible wirings and N rows of second flexible wirings formed on the top surface of the flexible substrate, whereby the first flexible wirings and the second flexible wirings cross over with each other to define M*N pixels, and each pixel is addressed by the (i), (i+1) and (i+2) columns of the first flexible wirings and the (j) row of the second flexible wiring, wherein M, N, i, j are natural numbers, and 1≦i≦3M−2, 1≦j≦N; an insulating layer sandwiched between the intersections of each first flexible wiring and each second flexible wiring or overlaid each second flexible wiring; a plurality of LED packages mounted within each of the pixels; a first fan-shaped circuit connected to the first flexible wirings; a second fan-shaped circuit connected to the second flexible wirings; and a driving circuit respectively interconnecting the first fan-shaped circuit and the second fan-shaped circuit. 
         [0009]    Another aspect of the LED display as mentioned above, wherein the transparent flexible substrate is selected from one of the group consisting of Polyethylene terephthalate (PET), Poly(methyl methacrylate (PMMA), Polyimide (PI), Polycarbonate (PC) and glass or combination thereof. 
         [0010]    Another aspect of the LED display as mentioned above, wherein the first flexible wires and the second flexible wires are selected from one of the group consisting of gold wire, silver wire, silver slurry, copper wire, carbon nanotube, poly-(3,4-ethylenedioxy thiophene)-polystyrene sulfonic acid (PEDOT) and nano silver or combination thereof. 
         [0011]    Another aspect of the LED display as mentioned above, wherein each of the LED packages is designed to emit red, green, blue emission spectrum and mixture thereof. 
         [0012]    Another aspect of the LED display as mentioned above, wherein each of the LED packages comprises a plurality of LED units designed to respectively emit red, green or blue emission spectrum. 
         [0013]    Another aspect of the LED display as mentioned above, wherein each of the LED packages comprises three LED units designed to respectively emit red, green or blue emission spectrum. 
         [0014]    Another aspect of the LED display as mentioned above, wherein each of the LED packages is mounted within each of the pixels by means of a conductive glue cured at a temperature lower than 250 degree C. and/or an anisotropic conductive film (ACF). 
         [0015]    Another aspect of the LED display as mentioned above, wherein the insulating layer is consisted of a single-layered or multiple-layered insulating material. 
         [0016]    Another aspect of the LED display as mentioned above, whereby each of the LED packages comprises a first conductive pin, a second conductive pin, a third conductive pin and a fourth conductive pin, and the (j) row of the second flexible wire has a first extension part connected to a first conductive pad, and the (i) column of the first flexible wire has a second extension part connected to a second conductive pad, and the (i+1) column of the first flexible wire has a fourth extension part connected to a fourth conductive pad, and the (i+2) column of the first flexible wire has a third extension part connected to a third conductive pad, wherein the first conductive pin is electrically connected to the (j) row of the second flexible wire by interconnecting the first conductive pad, the second conductive pin is electrically connected to the (i) column of the first flexible wire by interconnecting the second conductive pad, the fourth conductive pin is electrically connected to the (i+1) column of the first flexible wire by interconnecting the fourth conductive pad, and the third conductive pin is electrically connected to the (i+2) column of the first flexible wire by interconnecting the third conductive pad. 
         [0017]    Another aspect of the LED display as mentioned above, the driving circuit further comprising a driver IC. 
         [0018]    Another aspect of the LED display as mentioned above, wherein the (i) column of the first flexible wire is depicted on the left side of each LED package, the (i+2) of the first flexible wire is depicted on the right side of each LED package, and the (i+1) of the first flexible wire is depicted under each LED package. 
         [0019]    Another aspect of the LED display as mentioned above, wherein the (i) column of the first flexible wire is depicted on the left side of each LED package, and the (i+2), the (i+1) of the first flexible wire are depicted on the right side of each LED package. 
         [0020]    Another aspect of the LED display as mentioned above, further comprising a dielectric layer sandwiched between the intersection of third extension part of the (i+2) column of the first flexible wire and the (i+1) column of the first flexible wire. 
         [0021]    Another aspect of the LED display as mentioned above, the dielectric layer is consisted of a single-layered or multiple-layered insulating material. 
         [0022]    Another aspect of this invention provides another LED display, comprising: a transparent flexible substrate having a top surface and a bottom surface opposite to each other; 3P columns of first flexible wirings and Q rows of second flexible wirings formed on the top surface of the flexible substrate, whereby the first flexible wirings and the second flexible wirings cross over with each other to define P*Q pixels, and each pixel comprising: a first sub-pixel, addressed by the (r) column of the first flexible wirings and the (s) row of the second flexible wiring; a second sub-pixel, addressed by the (r+1) column of the first flexible wirings and the (s) row of the second flexible wiring; a third sub-pixel, addressed by the (r+2) column of the first flexible wirings and the (s) row of the second flexible wiring; wherein P, Q, r, s are natural numbers, and 1≦r≦3P−2, 1≦s≦Q; an insulating layer sandwiched between the intersections of each first flexible wiring and each second flexible wiring or overlaid each second flexible wiring; a plurality of first LED packages mounted within each of the first sub-pixels; a plurality of second LED packages mounted within each of the second sub-pixels; a plurality of third LED packages mounted within each of the third sub-pixels; a first fan-shaped circuit connected to the first flexible wirings; a second fan-shaped circuit connected to the second flexible wirings; and a driving circuit respectively interconnecting the first fan-shaped circuit and the second fan-shaped circuit. 
         [0023]    Another aspect of the LED display as mentioned above, wherein the transparent flexible substrate is selected from one of the group consisting of Polyethylene terephthalate (PET), Poly(methyl methacrylate (PMMA), Polyimide (PI), Polycarbonate (PC) and glass or combination thereof. 
         [0024]    Another aspect of the LED display as mentioned above, wherein the first flexible wires and the second flexible wires are selected from one of the group consisting of gold wire, silver wire, silver slurry, copper wire, carbon nanotube, poly-(3,4-ethylenedioxy thiophene)-polystyrene sulfonic acid (PEDOT) and nano silver or combination thereof. 
         [0025]    Another aspect of the LED display as mentioned above, wherein the first LED packages are red LED packages or red LED flip-chips. 
         [0026]    Another aspect of the LED display as mentioned above, wherein the second LED packages are green LED packages or green LED flip-chips. 
         [0027]    Another aspect of the LED display as mentioned above, wherein the third LED packages are blue LED packages or blue LED flip-chips. 
         [0028]    Another aspect of the LED display as mentioned above, wherein each of the first, second, third LED packages is respectively mounted within each of the first-subpixels, each of the second sub-pixels and each of the third sub-pixels by means of a conductive glue cured at a temperature lower than 250 degree C. and/or an anisotropic conductive film (ACF). 
         [0029]    Another aspect of the LED display as mentioned above, wherein the insulating layer is consisted of a single-layered or multiple-layered insulating material. 
         [0030]    Another aspect of the LED display as mentioned above, whereby: each of the first LED packages comprises a fifth conductive pin and a sixth conductive pin, and the (s) row of the second flexible wire has a fifth extension part connected to a fifth conductive pad, and the (r) column of the first flexible wire has a sixth extension part connected to a sixth conductive pad, wherein the fifth conductive pin is electrically connected to the (s) row of the second flexible wire by interconnecting the fifth conductive pad, and the sixth conductive pin is electrically connected to the (r) column of the first flexible wire by interconnecting the sixth conductive pad; each of the second LED packages comprises a seventh conductive pin and a eighth conductive pin, and the (s) row of the second flexible wire has a seventh extension part connected to a seventh conductive pad, and the (r+1) column of the first flexible wire has an eighth extension part connected to an eighth conductive pad, wherein the seventh conductive pin is electrically connected to the (s) row of the second flexible wire by interconnecting the seventh conductive pad, and the eighth conductive pin is electrically connected to the (r+1) column of the first flexible wire by interconnecting the eighth conductive pad; and each of the third LED packages comprises a ninth conductive pin and a tenth conductive pin, and the (s) row of the second flexible wire has a ninth extension part connected to a ninth conductive pad, and the (r+2) column of the first flexible wire has a tenth extension part connected to a tenth conductive pad, wherein the ninth conductive pin is electrically connected to the (s) row of the second flexible wire by interconnecting the ninth conductive pad, and the tenth conductive pin is electrically connected to the (r+2) column of the first flexible wire by interconnecting the tenth conductive pad 
         [0031]    Another aspect of the LED display as mentioned above, the driving circuit further comprising a driver IC. 
         [0032]    Another aspect of this invention provides another LED display, comprising: a transparent flexible substrate having a top surface and a bottom surface opposite to each other; 2A columns of first flexible wirings and 2B rows of second flexible wirings formed on the top surface of the flexible substrate, whereby the first flexible wirings and the second flexible wirings cross over with each other to define A*B pixels, and each pixel comprising: a first sub-pixel, addressed by the (d) column of the first flexible wirings and the (e) row of the second flexible wiring; a second sub-pixel, addressed by the (d+1) column of the first flexible wirings and the (e) row of the second flexible wiring; a third sub-pixel, addressed by the (d) column of the first flexible wirings and the (e+1) row of the second flexible wiring; a fourth sub-pixel, addressed by the (d+1) column of the first flexible wirings and the (e+1) row of the second flexible wiring; wherein A, B, d, e are natural numbers, and 1≦d≦2A−1, 1≦e≦2B−1; an insulating layer sandwiched between the intersections of each first flexible wiring and each second flexible wiring or overlaid each second flexible wiring; a plurality of first LED packages mounted within each of the first sub-pixels; a plurality of second LED packages mounted within each of the second sub-pixels; a plurality of third LED packages mounted within each of the third sub-pixels; a plurality of fourth LED packages mounted within each of the fourth sub-pixels; a first fan-shaped circuit connected to the first flexible wirings; a second fan-shaped circuit connected to the second flexible wirings; and driving circuit respectively interconnecting the first fan-shaped circuit and the second fan-shaped circuit. 
         [0033]    Another aspect of the LED display as mentioned above, wherein the transparent flexible substrate is selected from one of the group consisting of Polyethylene terephthalate (PET), Poly(methyl methacrylate (PMMA), Polyimide (PI), Polycarbonate (PC) and glass or combination thereof. 
         [0034]    Another aspect of the LED display as mentioned above, wherein the first flexible wires and the second flexible wires are selected from one of the group consisting of gold wire, silver wire, silver slurry, copper wire, carbon nanotube, poly-(3,4-ethylenedioxy thiophene)-polystyrene sulfonic acid (PEDOT) and nano silver or combination thereof. 
         [0035]    Another aspect of the LED display as mentioned above, wherein the first LED packages are red LED packages or red LED flip-chips. 
         [0036]    Another aspect of the LED display as mentioned above, wherein the second LED packages are green LED packages or green LED flip-chips. 
         [0037]    Another aspect of the LED display as mentioned above, wherein the third LED packages are blue LED packages or blue LED flip-chips. 
         [0038]    Another aspect of the LED display as mentioned above, wherein the fourth LED packages are yellow LED packages or yellow LED flip-chips. 
         [0039]    Another aspect of the LED display as mentioned above, wherein the fourth LED packages are white LED packages or white LED flip-chips. 
         [0040]    Another aspect of the LED display as mentioned above, wherein each of the first, second, third LED and fourth packages is respectively mounted within each of the first-subpixels, each of the second sub-pixels, each of the third sub-pixels and each of the fourth sub-pixels by means of a conductive glue cured at a temperature lower than 250 degree C. and/or an anisotropic conductive film (ACF). 
         [0041]    Another aspect of the LED display as mentioned above, wherein the insulating layer is consisted of a single-layered or multiple-layered insulating material. 
         [0042]    Another aspect of the LED display as mentioned above, whereby: each of the first LED packages comprises a fifth conductive pin and a sixth conductive pin, and the (e) row of the second flexible wire has a fifth extension part connected to a fifth conductive pad, and the (d) column of the first flexible wire has a sixth extension part connected to a sixth conductive pad, wherein the fifth conductive pin is electrically connected to the (e) row of the second flexible wire by interconnecting the fifth conductive pad, and the sixth conductive pin is electrically connected to the (d) column of the first flexible wire by interconnecting the sixth conductive pad; each of the second LED packages comprises a seventh conductive pin and a eighth conductive pin, and the (e) row of the second flexible wire has a seventh extension part connected to a seventh conductive pad, and the (d+1) column of the first flexible wire has an eighth extension part connected to an eighth conductive pad, wherein the seventh conductive pin is electrically connected to the (e) row of the second flexible wire by interconnecting the seventh conductive pad, and the eighth conductive pin is electrically connected to the (d+1) column of the first flexible wire by interconnecting the eighth conductive pad; each of the third LED packages comprises a ninth conductive pin and a tenth conductive pin, and the (e+1) row of the second flexible wire has a ninth extension part connected to a ninth conductive pad, and the (d) column of the first flexible wire has a tenth extension part connected to a tenth conductive pad, wherein the ninth conductive pin is electrically connected to the (e+1) row of the second flexible wire by interconnecting the ninth conductive pad, and the tenth conductive pin is electrically connected to the (d) column of the first flexible wire by interconnecting the tenth conductive pad; and each of the fourth LED packages comprises a eleventh conductive pin and a twelfth conductive pin, and the (e+1) row of the second flexible wire has a eleventh extension part connected to a eleventh conductive pad, and the (d+1) column of the first flexible wire has a twelfth extension part connected to a twelfth conductive pad, wherein the eleventh conductive pin is electrically connected to the (e+1) row of the second flexible wire by interconnecting the eleventh conductive pad, and the twelfth conductive pin is electrically connected to the (d+1) column of the first flexible wire by interconnecting the twelfth conductive pad. 
         [0043]    Another aspect of the LED display as mentioned above, the driving circuit further comprising a driver IC. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0044]      FIG. 1A  illustrates the top-view of the flexible LED display according to the embodiment 1. 
           [0045]      FIGS. 1B ˜ 1 C illustrate the enlarged views of one of the pixels  150  as shown in  FIG. 1A . 
           [0046]      FIG. 1A ′ illustrates the top-view of the flexible LED display according to the embodiment 2. 
           [0047]      FIGS. 1B ′˜ 1 C′ illustrate the enlarged views of one of the pixels  150 ′ as shown in  FIG. 1A ′. 
           [0048]      FIG. 2A  illustrates the top-view of the flexible LED display according to the embodiment 3. 
           [0049]      FIGS. 2B ˜ 2 C illustrate the enlarged views of one of the pixels  250  as shown in  FIG. 2A . 
           [0050]      FIG. 3A  illustrates the top-view of the flexible LED display according to the embodiment 4. 
           [0051]      FIGS. 3B ˜ 3 C illustrate the enlarged views of one of the pixels  350  as shown in  FIG. 3A . 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Embodiment 1 
       [0052]    First, please refer to  FIG. 1A  which illustrates the top-view of the flexible LED display  100  according to the embodiment 1. As shown in  FIG. 1A , the LED display  100  comprises a transparent flexible substrate  110  having a top surface  110 A and a bottom surface opposite to each other, which can be selected from one of the group consisting of Polyethylene terephthalate (PET), Poly(methyl methacrylate (PMMA), Polyimide (PI), Polycarbonate (PC) and glass or combination thereof The transparent flexible substrate  110  of this embodiment is consisted of PET. 
         [0053]    There are M columns of first flexible wires  120 A, M columns of the first flexible wires  120 B, and M columns of the first flexible wires  120 C alternatively formed in parallel on the top surface  110 A of the transparent flexible substrate  110 , and N rows of second flexible wires  130  formed on the top surface  110 A of the transparent flexible substrate  110  and cross over with the first flexible wires  120 A,  120 B and  120 C to define M*N pixels  150 , wherein M and N are both natural numbers. 
         [0054]    Besides, the first flexible wires  120 A,  120 B and  120 C are electrically connected to the flexible print circuit board (FPC)  180  via the first fan-shaped circuit  140 A to interconnect the driving circuit (not shown) on the driver IC units and control circuit units  190 , and the second flexible wires  130  are electrically connected to the flexible print circuit board (FPC)  180  via the second fan-shaped circuit  140 B to interconnect the driving circuit (not shown) having driver ICs and control units on the control board  190 . 
         [0055]    The first flexible wires  120 A,  120 B and  120 C, and the second flexible wires  130  can be selected from one of the group consisting of gold wire, silver wire, silver slurry, copper wire, carbon nanotube, poly-(3,4-ethylenedioxy thiophene)-polystyrene sulfonic acid (PEDOT) and nano silver or combination thereof. The first flexible wires  120 A,  120 B and  120 C, and the second flexible wires  130  of this embodiment are consisted of carbon nanotube. 
         [0056]    Next, please refer to  FIGS. 1B and 1C  which illustrate the enlarged views of one of the pixels  150  as shown in  FIG. 1A . As illustrated in  FIG. 1B , the pixel  150  is addressed by the (i), (i+1) and (i+2) columns of the first flexible wires  120 A,  120 B and  120 C, and the (j) row of the second flexible wiring  130 , wherein the (i) column of the first flexible wire  120 A is depicted on the left side of each LED package  160 , the (i+2) column of the first flexible wire  120 C is depicted on the right side of each LED package  160 , and the (i+1) column of the first flexible wire  120 B is depicted under each LED package  160 . A LED package  160  emitting red, green, blue light or mixture thereof is mounted within the pixel  150 , wherein i and j are both natural numbers, and 1≦i≦3M−2, 1≦j≦N. Besides, as shown in  FIG. 1C , an insulating layer  125  is sandwiched between the intersections of the first flexible wires  120 A,  120 B,  120 C and the second flexible wire  130 . Furthermore, the insulating layer  125  can be a single-layered or a double-layered insulating material (not shown) to avoid disconnection owing to the height gap of the first flexible wires  120 A,  120 B,  120 C across each of the second flexible wires  130 . Alternatively, the insulating layer  125  can also overall overlay each of the second flexible wires  130  in other embodiments of this invention (not shown). 
         [0057]    Each of the LED packages  160  comprises a plurality of LED units (not shown) designed to respectively emit red, green, or blue emission spectrum. The LED units of this embodiment are LED chips respectively emitting red, green or blue emission. In addition, the non-emitting bottom side (not shown) of each LED package  160  comprises a first conductive pin  160 A, a second conductive pin  160 B, a third conductive pin  160 C and a fourth conductive pin  160 D. LED units emits suitable visible emission spectrum other than red, green and blue emission spectrums can also be selected as the LED units of the LED package  160 . The arrangement of these LED units inside the LED package  160  can be adjusted as needed. 
         [0058]    As illustrated in  FIGS. 1B ˜ 1 C, the (j) row of the second flexible wire  130  has a first extension part  131  connected to a first conductive pad  145 A, and the (i) column of the first flexible wire  120 A has a second extension part  120 A 1  connected to a second conductive pad  145 B, and the (i+1) column of the first flexible wire  120 B has a fourth extension part  120 B 1  connected to a fourth conductive pad  145 D, and the (i+2) column of the first flexible wire  120 C has a third extension part  120 C 1  connected to a third conductive pad  145 C, whereby the first conductive pin  160 A of the LED package  160  is electrically connected to the (j) row of the second flexible wire  130  by interconnecting the first conductive pad  145 A by means of the conductive glue  155  cured at a temperature lower than 250 degree C.; the second conductive pin  160 B of the LED package  160  is electrically connected to the (i) column of the first flexible wire  120 A by interconnecting the second conductive pad  145 B by means of the conductive glue  155  cured at a temperature lower than 250 degree C.; the third conductive pin  160 C of the LED package  160  is electrically connected to the (i+2) column first flexible wire  120 C by interconnecting the third conductive pad  145 C by means of the conductive glue  155  cured at a temperature lower than 250 degree C.; and the fourth conductive pin  160 D of the LED package  160  is electrically connected to the (i+1) column first flexible wire  120 C by interconnecting the fourth conductive pad  145 D by means of the conductive glue  155  cured at a temperature lower than 250 degree C. Furthermore, the conductive glue  255  can also be used together with an anisotropic conductive film (ACF) (not shown) or replaced with the anisotropic conductive film (ACF) (not shown) in other embodiments of this invention. 
         [0059]    Accordingly, a flexible LED display with a high density array according to this embodiment 1 can be easily manufactured by forming flexible wires on a transparent flexible substrate and mounting each of full color LED packages within each of pixels defined by the flexible wires. 
       Embodiment 2 
       [0060]    First, please refer to  FIG. 1A ′ which illustrates the top-view of the flexible LED display  100 ′ according to the embodiment 2. As shown in  FIG. 1A ′, the LED display  100 ′ comprises a transparent flexible substrate  110  having a top surface  110 A and a bottom surface  110 B opposite to each other, which can be selected from one of the group consisting of Polyethylene terephthalate (PET), Poly(methyl methacrylate (PMMA), Polyimide (PI), Polycarbonate (PC) and glass or combination thereof The transparent flexible substrate  110  of this embodiment is consisted of PET. 
         [0061]    There are M columns of first flexible wires  120 A, M columns of the first flexible wires  120 B, and M columns of the first flexible wires  120 C alternatively formed in parallel on the top surface  110 A of the transparent flexible substrate  110 , and N rows of second flexible wires  130  formed on the top surface  110 A of the transparent flexible substrate  110  and cross over with the first flexible wires  120 A,  120 B and  120 C to define M*N pixels  150 , wherein M and N are both natural numbers. 
         [0062]    Besides, the first flexible wires  120 A,  120 B and  120 C are electrically connected to the flexible print circuit board (FPC)  180  via the first fan-shaped circuit  140 A to interconnect the driving circuit (not shown) on the driver IC units and control circuit units  190 , and the second flexible wires  130  are electrically connected to the flexible print circuit board (FPC)  180  via the second fan-shaped circuit  140 B to interconnect the driving circuit (not shown) having driver ICs and control units on the control board  190 . 
         [0063]    The first flexible wires  120 A,  120 B and  120 C, and the second flexible wires  130  can be selected from one of the group consisting of gold wire, silver wire, silver slurry, copper wire, carbon nanotube, poly-(3,4-ethylenedioxy thiophene)-polystyrene sulfonic acid (PEDOT) and nano silver or combination thereof. The first flexible wires  120 A,  120 B and  120 C, and the second flexible wires  130  of this embodiment are consisted of carbon nanotube. 
         [0064]    Next, please refer to  FIGS. 1B ′ and  1 C′ which illustrate the enlarged views of one of the pixels  150  as shown in  FIG. 1A ′. As shown in  FIG. 1B ′, the pixel  150  is addressed by the (i), (i+1) and (i+2) columns of the first flexible wires  120 A,  120 B and  120 C, and the (j) row of the second flexible wiring  130 , wherein the (i) column of the first flexible wire  120 A is depicted on the left side of each LED package  160 , the (i+1) and (i+2) columns of the first flexible wire  120 B and  120 C are depicted on the right side of each LED package  160 . A LED package  160  emitting red, green, blue light or mixture thereof is mounted within each pixel  150 , wherein i and j are both natural numbers, and 1≦i≦3M−2, 1≦j≦N. Besides, an insulating layer  125  is formed to overall overlay each of the second flexible wires  130 . 
         [0065]    The difference between the embodiments 1 and 2 is the first flexible wire  120 B of embodiment 2 is depicted on the right side of the LED package  160  instead of depicting under the LED package  160  as that of embodiment 1. In addition, the insulating layer  125 ′ of this embodiment is a double-layered structure including a first insulating layer  125 A and a second insulating layer  125 B formed on the first insulating layer  125 A, and the vertical projection area of the second insulating layer  125 B is smaller than that of the first insulating layer  125 A. The insulating layer  125 ′ can also be a single-layered structure (not shown) or sandwiched between the intersections of the first flexible wires  120 A,  120 B,  120 C and the second flexible wires  130  in other embodiments of this invention. 
         [0066]    Each of the LED packages  160  comprises various LED units (not shown) designed to respectively emit red, green, or blue emission spectrum. The LED units of this embodiment are LED chips respectively emitting red, green or blue emission. In addition, the non-emitting bottom side (not shown) of each LED package  160  comprises a first conductive pin  160 A, a second conductive pin  160 B, a third conductive pin  160 C and a fourth conductive pin  160 D. LED units emits suitable visible emission spectrum other than red, green and blue emission spectrums can also be selected as the LED units of the LED package  160 . The arrangement of these LED units inside the LED package  160  can be adjusted as needed. 
         [0067]    As illustrated in  FIGS. 1B ′˜ 1 C′, the (j) row of the second flexible wire  130  has a first extension part  131  connected to a first conductive pad  145 A, and the (i) column of the first flexible wire  120 A has a second extension part  120 A 1  connected to a second conductive pad  145 B, and the (i+1) column of the first flexible wire  120 B has a fourth extension part  120 B 1  connected to a fourth conductive pad  145 D, and the (i+2) column of the first flexible wire  120 C has a third extension part  120 C 1  connected to a third conductive pad  145 C, whereby the first conductive pin  160 A of the LED package  160  is electrically connected to the (j) row of the second flexible wire  130  by interconnecting the first conductive pad  145 A by means of the conductive glue  155  cured at a temperature lower than 250 degree C.; the second conductive pin  160 B of the LED package  160  is electrically connected to the (i) column of the first flexible wire  120 A by interconnecting the second conductive pad  145 B by means of the conductive glue  155  cured at a temperature lower than 250 degree C.; the third conductive pin  160 C of the LED package  160  is electrically connected to the (i+2) column first flexible wire  120 C by interconnecting the third conductive pad  145 C by means of the conductive glue  155  cured at a temperature lower than 250 degree C.; and the fourth conductive pin  160 D of the LED package  160  is electrically connected to the (i+1) column first flexible wire  120 B by interconnecting the fourth conductive pad  145 D by means of the conductive glue  155  cured at a temperature lower than 250 degree C. Furthermore, the conductive glue  155  can also be used together with the anisotropic conductive film (ACF) or replaced with the anisotropic conductive film (ACF) in other embodiments of this invention. A dielectric layer  126  is sandwiched between the intersection of the third extension part  120 C 1  of the first flexible wire  120 C and the first flexible wire  120 B, wherein the dielectric layer  126  of this embodiment is a double-layered structure including a first dielectric layer  126 A and a second dielectric layer  126 B, and the vertical projection area of the second dielectric layer  126 B is smaller than that of the first dielectric layer  126 A. The dielectric layer  126  of other embodiments of this invention can also be a single-layered structure. Furthermore, the conductive glue  255  can also be used together with an anisotropic conductive film (ACF) (not shown) or replaced with the anisotropic conductive film (ACF) (not shown) in other embodiments of this invention. 
         [0068]    Accordingly, a flexible LED display with a high density array of this embodiment 2 can be easily manufactured by forming flexible wires on a transparent flexible substrate and mounting each of full color LED packages in each of pixels defined by the flexible wires. 
       Embodiment 3 
       [0069]    First, please refer to  FIG. 2A  which illustrates the top-view of the flexible LED display according to the embodiment 3. As shown in  FIG. 2A , the LED display  200  comprises a transparent flexible substrate  210  having a top surface  210 A and a bottom surface  210 B opposite to each other, which can be selected from one of the group consisting of Polyethylene terephthalate (PET), Poly(methyl methacrylate (PMMA), Polyimide (PI), Polycarbonate (PC) and glass or combination thereof The transparent flexible substrate  210  of this embodiment is consisted of PET. 
         [0070]    There are P columns of first flexible wires  220 A, P columns of the first flexible wires  220 B, and P columns of the first flexible wires  220 C alternatively formed in parallel on the top surface  210 A of the transparent flexible substrate  210 , and Q rows of second flexible wires  230  formed on the top surface  210 A of the transparent flexible substrate  210  and cross over with the first flexible wires  220 A,  220 B and  220 C to define P*Q pixels  250 , wherein P and Q are both natural numbers. 
         [0071]    Besides, the first flexible wires  220 A,  220 B and  220 C are electrically connected to the flexible print circuit board (FPC)  280  via the first fan-shaped circuit  240 A to interconnect the driving circuit (not shown) on the driver IC units and control circuit units  290 , and the second flexible wires  230  are electrically connected to the flexible print circuit board (FPC)  280  via the second fan-shaped circuit  240 B to interconnect the driving circuit (not shown) having driver ICs and control units on the control board  290 . 
         [0072]    The first flexible wires  220 A,  220 B and  220 C, and the second flexible wires  230  can be selected from one of the group consisting of gold wire, silver wire, silver slurry, copper wire, carbon nanotube, poly-(3,4-ethylenedioxy thiophene)-polystyrene sulfonic acid (PEDOT) and nano silver or combination thereof. The first flexible wires  220 A,  220 B and  220 C, and the second flexible wires  230  of this embodiment are consisted of carbon nanotube. 
         [0073]    Next, please refer to  FIGS. 2B and 2C  which illustrate the enlarged views of one of the pixels  250  as shown in  FIG. 2A . As illustrated in  FIG. 2B , each pixel  250  includes a first sub-pixel  250 A addressed by the (r) column of the first flexible wires  220 A and the (s) row of the second flexible wiring  230 ; a second sub-pixel  250 B addressed by the (r+1) column of the first flexible wires  220 B and the (s) row of the second flexible wiring  230 ; and a third sub-pixel  250 C addressed by the (r+2) column of the first flexible wires  220 C and the (s) row of the second flexible wiring  230 , whereby r, s are both natural numbers, and 1≦r≦3P−2, 1≦s≦Q. 
         [0074]    As illustrated in  FIGS. 2B and 2C , each of the second flexible wires  230  is overlaid by an insulating layer  225  to insulate the first flexible wires  220 A,  220 B and  220 C. The insulating layer  225  is a double-layered structure including a first insulating layer  225 A and a second insulating layer  225 B formed on the first insulating layer  225 B, and the vertical projection area of the second insulating layer  225 B is smaller than that of the first insulating layer  225 A. The insulating layer  225  of other embodiments of this invention can also be a single-layered structure (not shown) or sandwiched between the intersections (not shown) of the first flexible wires  220 A,  220 B,  220 C and the second flexible wires  230 . 
         [0075]    Next, a plurality of first LEDs  260 A are provided and mounted within each first sub-pixel  250 A, whereby each of the first LEDs  260 A has a fifth conductive pin  260 A 1  and a sixth conductive pin  260 A 2  on its non-emitting side (not shown). A plurality of second LEDs  260 B are provided and mounted within each second sub-pixel  250 B, whereby each of the second LEDs  260 B has a seventh conductive pin  260 B 1  and a eighth conductive pin  260 B 2  on its non-emitting side (not shown). A plurality of third LEDs  260 C are provided and mounted within each third sub-pixel  250 C, whereby each of the third LEDs  260 C has a ninth conductive pin  260 C 1  and a tenth conductive pin  260 C 2  on its non-emitting side (not shown). 
         [0076]    The first LEDs  260 A of this embodiment are red LED packages; the second LEDs  260 B of this embodiment are green LED packages; and the third LEDs  260 C of this embodiment are blue LED packages. The first LEDs  260 A, the second LEDs  260 B and the third LEDs  260 C of other embodiments of this invention can be selected from LED packages emitting visible spectrum other than red, green and blue emission spectrum, and the arrangement of these LED packages can be adjusted as needed. Furthermore, the first LEDs  260 A, the second LEDs  260 B and the third LEDs  260 C can also be replaced with red LED flip chips, green LED flip chips and blue LED flip chips, and the arrangement of these LED flip chips can also be adjusted as needed. 
         [0077]    As illustrated in  FIGS. 2B and 2C , the (s) row of the second flexible wire  230  has a fifth extension part  230 A 1  connected to a fifth conductive pad  245 R 1 , and the (r) column of the first flexible wire  220 A has a sixth extension part  220 A 1  connected to a sixth conductive pad  245 R 2 , whereby the fifth conductive pin  260 A 1  of the first LED  260 A is electrically connected to the (s) row of the second flexible wire  230 A by interconnecting the fifth conductive pad  245 R 1  by means of a conductive glue  255  cured at a temperature lower than 250 degree C., and the sixth conductive pin  260 A 2  is electrically connected to the (r) column of the first flexible wire  220 A by interconnecting the sixth conductive pad  245 R 2  by means of a conductive glue  255  cured at a temperature lower than 250 degree C.; the (s) row of the second flexible wire  230  has a seventh extension part  230 A 2  connected to a seventh conductive pad  245 G 1 , and the (r+1) column of the first flexible wire  220 B has an eighth extension part  220 B 1  connected to an eighth conductive pad  245 G 2 , wherein the seventh conductive pin  260 B 1  is electrically connected to the (s) row of the second flexible wire  230  by interconnecting the seventh conductive pad  245 G 1 , and the eighth conductive pin  260 B 2  is electrically connected to the (r+1) column of the first flexible wire  220 B by interconnecting the eighth conductive pad  245 G 2  by means of a conductive glue  255  cured at a temperature lower than 250 degree C.; and the (s) row of the second flexible wire  230  has a ninth extension part  230 A 3  connected to a ninth conductive pad  245 B 1 , and the (r+2) column of the first flexible wire  220 C has a tenth extension part  220 C 1  connected to a tenth conductive pad  245 B 2 , wherein the ninth conductive pin  260 C 1  is electrically connected to the (s) row of the second flexible wire  230  by interconnecting the ninth conductive pad  245 B 1  by means of a conductive glue  255  cured at a temperature lower than 250 degree C., and the tenth conductive pin  260 C 2  is electrically connected to the (r+2) column of the first flexible wire  220 C by interconnecting the tenth conductive pad  245 B 2  by means of a conductive glue  255  cured at a temperature lower than 250 degree C. Furthermore, the conductive glue  255  can also be used together with an anisotropic conductive film (ACF) (not shown) or replaced with the anisotropic conductive film (ACF) (not shown) in other embodiments of this invention. 
         [0078]    Accordingly, a flexible LED display with a high density array of this embodiment 3 can be easily manufactured by forming flexible wires on a transparent flexible substrate and mounting each of red, green and blue LED packages or flip chips in each of pixels defined by the flexible wires. 
       Embodiment 4 
       [0079]    First, please refer to  FIG. 3A  which illustrates the top-view of the flexible LED display  300  according to the embodiment 4. As illustrated in  FIG. 3A , the LED display  300  comprises a transparent flexible substrate  310  having a top surface  310 A and a bottom surface  310 B opposite to each other, which can be selected from one of the group consisting of Polyethylene terephthalate (PET), Poly(methyl methacrylate (PMMA), Polyimide (PI), Polycarbonate (PC) and glass or combination thereof The transparent flexible substrate  310  of this embodiment is consisted of PET. 
         [0080]    There are A columns of first flexible wires  320 A and A columns of the second flexible wires  320 B alternatively formed in parallel on the top surface  310 A of the transparent flexible substrate  310 , and B rows of second flexible wires  330 A and B rows of second flexible wires  330 B alternatively formed in parallel on the top surface  310 A of the transparent flexible substrate  310  and cross over with the first flexible wires  320 A and  320 B to define A*B pixels  350 , wherein A and B are both natural numbers. 
         [0081]    Besides, the first flexible wires  320 A and  320 B are electrically connected to the flexible print circuit board (FPC)  380  via the first fan-shaped circuit  340 A to interconnect the driving circuit (not shown) on the driver IC units and control circuit units  390 , and the second flexible wires  330 A and  330 B are electrically connected to the flexible print circuit board (FPC)  380  via the second fan-shaped circuit  340 B to interconnect the driving circuit (not shown) having driver ICs and control units on the control board  390 . 
         [0082]    The first flexible wires  320 A and  320 B, and the second flexible wires  330 A and  330 B can be selected from one of the group consisting of gold wire, silver wire, silver slurry, copper wire, carbon nanotube, poly-(3,4-ethylenedioxy thiophene)-polystyrene sulfonic acid (PEDOT) and nano silver or combination thereof. The first flexible wires  320 A and  320 B, and the second flexible wires  330 A and  330 B of this embodiment are consisted of carbon nanotube. 
         [0083]    Next, please refer to  FIGS. 3B and 3C  which illustrate the enlarged views of one of the pixels  350  as shown in  FIG. 3A . As illustrated in  FIG. 3B , each pixel  350  includes a first sub-pixel  350 A addressed by the (d) column of the first flexible wires  320 A and the (e) row of the second flexible wiring  330 A; a second sub-pixel  350 B addressed by the (d+1) column of the first flexible wires  320 B and the (e) row of the second flexible wiring  330 A; and a third sub-pixel  350 C addressed by the (d) column of the first flexible wires  320 A and the (e+1) row of the second flexible wiring  330 B; and a fourth sub-pixel  350 D addressed by the (d+1) column of the first flexible wires  320 B and the (e+1) row of the second flexible wiring  330 B, whereby d and e are both natural numbers, and 1≦d≦2A−1, 1≦e≦2B−1. 
         [0084]    Each of the second flexible wires  330 A and  330 B is overlaid by an insulating layer  325  to insulate the first flexible wires  320 A and  320 B. The insulating layer  325  is a double-layered structure including a first insulating layer  325 A and a second insulating layer  325 B formed on the first insulating layer  325 B, and the vertical projection area of the second insulating layer  325 B is smaller than that of the first insulating layer  325 A. The insulating layer  325  of other embodiments of this invention can also be a single-layered structure (not shown) or sandwiched between the intersections (not shown) of the first flexible wires  320 A and  320 B and the second flexible wires  330 A and  330 B. 
         [0085]    Next, A plurality of first LEDs  360 A are provided and mounted within each first sub-pixel  350 A, whereby each of the first LEDs  360 A having a fifth conductive pin  360 A 1  and a sixth conductive pin  360 A 2  on its non-emitting side (not shown). A plurality of second LEDs  360 B are provided and mounted within each second sub-pixel  350 B, whereby each of the second LEDs  360 B having a seventh conductive pin  360 B 1  and a eighth conductive pin  360 B 2  on its non-emitting side (not shown). A plurality of third LEDs  360 C are provided and mounted within each third sub-pixel  350 C, whereby each of the third LEDs  360 C having a ninth conductive pin  360 C 1  and a tenth conductive pin  360 C 2  on its non-emitting side (not shown). A plurality of fourth LEDs  360 D are provided and mounted within each fourth sub-pixel  350 D, whereby each of the fourth LEDs  360 D having a eleventh conductive pin  360 D 1  and a twelfth conductive pin  360 D 2  on its non-emitting side (not shown). 
         [0086]    The first LEDs  360 A of this embodiment are red LED packages; the second LEDs  360 B of this embodiment are green LED packages; the third LEDs  360 C of this embodiment are blue LED packages; and the fourth LEDs  360 D of this embodiment are yellow or white LED packages. The first LEDs  360 A, the second LEDs  360 B, the third LEDs  360 C and the fourth LEDs  360 D of other embodiments of this invention can be selected from LED packages emitting visible spectrum other than red, green, blue, yellow and white emission spectrum, and the arrangement of these LED packages can be adjusted as needed. Furthermore, the first LEDs  360 A, the second LEDs  360 B, the third LEDs  360 C and the fourth LEDs  360 D can also be replaced with red LED flip chips, green LED flip chips, blue LED flip chips and yellow or white LED flip chips, and the arrangement of these LED flip chips can also be adjusted as needed. 
         [0087]    As illustrated in  FIGS. 3B and 3C , the (e) row of the second flexible wire  330 A has a fifth extension part  330 A 1  connected to a fifth conductive pad  345 R 1 , and the (d) column of the first flexible wire  320 A has a sixth extension part  320 A 1  connected to a sixth conductive pad  345 R 2 , whereby the fifth conductive pin  360 A 1  of the first LED  360 A is electrically connected to the (e) row of the second flexible wire  330 A by interconnecting the fifth conductive pad  345 R 1  by means of a conductive glue  355  cured at a temperature lower than 250 degree C., and the sixth conductive pin  360 A 2  is electrically connected to the (d) column of the first flexible wire  320 A by interconnecting the sixth conductive pad  345 R 2  by means of a conductive glue  355  cured at a temperature lower than 250 degree C.; the (e) row of the second flexible wire  230  has a seventh extension part  330 A 2  connected to a seventh conductive pad  345 G 1 , and the (d+1) column of the first flexible wire  320 B has an eighth extension part  320 B 1  connected to an eighth conductive pad  345 G 2 , wherein the seventh conductive pin  360 B 1  of the second LED  360 B is electrically connected to the (e) row of the second flexible wire  330 A by interconnecting the seventh conductive pad  345 G 1  by means of a conductive glue  355  cured at a temperature lower than 250 degree C., and the eighth conductive pin  360 B 2  is electrically connected to the (d+1) column of the first flexible wire  320 B by interconnecting the eighth conductive pad  345 G 2  by means of a conductive glue  2355  cured at a temperature lower than 250 degree C.; the (d) row of the second flexible wire  320 A has a ninth extension part  320 A 2  connected to a ninth conductive pad  345 B 1 , and the (e+1) column of the first flexible wire  330 B has a tenth extension part  330 B 1  connected to a tenth conductive pad  345 B 2 , wherein the ninth conductive pin  360 C 1  of the third LED  360 C is electrically connected to the (e+1) row of the second flexible wire  330 B by interconnecting the ninth conductive pad  345 B 1  by means of a conductive glue  355  cured at a temperature lower than 250 degree C., and the tenth conductive pin  360 C 2  is electrically connected to the (d) column of the first flexible wire  320 A by interconnecting the tenth conductive pad  345 B 2  by means of a conductive glue  355  cured at a temperature lower than 250 degree C.; and the (e+1) row of the second flexible wire  330 B has a eleventh extension part  330 B 2  connected to a eleventh conductive pad  345 Y 1 , and the (d+1) column of the first flexible wire  320 B has a twelfth extension part  320 B 1  connected to a twelfth conductive pad  345 Y 2 , wherein the eleventh conductive pin  360 D 1  of the fourth LED  360 D is electrically connected to the (e+1) row of the second flexible wire  330 B by interconnecting the eleventh conductive pad  345 Y 1  by means of a conductive glue  355  cured at a temperature lower than 250 degree C., and the twelfth conductive pin  360 D 2  is electrically connected to the (d+1) column of the first flexible wire  320 B by interconnecting the twelfth conductive pad  345 Y 2  by means of a conductive glue  355  cured at a temperature lower than 250 degree C. Furthermore, the conductive glue  255  can also be used together with an anisotropic conductive film (ACF) (not shown) or replaced with the anisotropic conductive film (ACF) (not shown) in other embodiments of this invention. 
         [0088]    Accordingly, a flexible LED display with a high density array of this embodiment 4 can be easily manufactured by forming flexible wires on a transparent flexible substrate and mounting each of red, green, blue and yellow or white LED packages or flip chips in each of pixels defined by the flexible wires. 
         [0089]    To sum up, this present invention provides a flexible LED display by utilizing flexible wirings and the locations of the conductive pins on the bottom side of each single color LEDs or full color LEDs to make each of the single color LEDs or full color LEDs mount on each pixel defined by the flexible wires formed on the transparent flexible substrate. 
         [0090]    While the invention has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangement.