Patent Publication Number: US-8992066-B2

Title: Backlight system, backlight system manufacture method and panel display device

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to the field of displaying techniques, and in particular to a backlight system, backlight system manufacture method and panel display device. 
     2. The Related Arts 
     The known liquid crystal display device includes a front frame, a back panel and a backlight system, where the backlight system includes a back frame, reflector, light guide plate (LGP) and light set. 
     Currently, there are different sizes of display panel to meet the different application needs. For example, for TV, the liquid crystal panel provides the sizes of 31.5, 42, 46, 48 and 55 inches. Based on the size of the liquid crystal panel, different sizes of back frame molds must be used. 
     Referring to  FIG. 1 ,  FIG. 1  is a schematic view showing the structure of a back frame in a known liquid crystal displaying technique. As shown in  FIG. 1 , back frame  10  adopts a monolithic design, usually requires a metal stamping or plastic injection manufacture technique. Monolithic back frame  10  usually consumes a large amount of material and the cost is high. In addition, a larger stamping facility is required to manufacture large-sized back frame  10 . Also, a large mold is required, and the mold usually has complicated structure, which is costly. Therefore, the cost of known back frame technique is usually high. 
     Besides, when adopting LED as light source, the LED is packaged onto the MCPCB, and then attached directly to back frame  10  or to the aluminum extrusion contacting back frame  10 . The above approach uses more elements, and increases the element material cost. In addition, when adopting stent design to package the LED onto the stent, the heat generated by LED may not be dissipated in time so as to affect the optical effect of the liquid crystal display device. 
     SUMMARY OF THE INVENTION 
     The technical issue to be addressed by the present invention is to provide a backlight system, a backlight system manufacture method and a panel display device, so as to reduce the material cost, mold cost and solve the heat dissipation problem. 
     The present invention provides a panel display device, which comprises: a backlight system, the backlight system further comprising a back frame and LED light source; wherein the back frame comprising at least a first main splice element and a second main splice element; the first main splice element having one end disposed with at least two splice parts, with each of splice parts having a structure matching a corresponding end of the second main splice element; the first main splice element splicing with the corresponding end of the second main splice element through one of the splice parts; the first main splice element or the second main splice element comprising a bottom plate and a side plate extending upwards from long side of the bottom plate; the backlight system comprising a package stent, disposed on inner side of the side plate of the first main splice element or the second main splice element; number of LED light source being plural, and LED light source being packaged directly onto the package stent; the package stent being disposed with a heat dissipation layer partially or entirely. 
     According to preferred embodiment of the present invention, the back frame further comprises a third main splice element and a fourth main splice element; the first main splice element, the second main splice element, the third main splice element and the fourth main splice element are all of the long stripe shape, and are spliced together in a head-to-tail manner to form a surrounding rectangular main frame of the back frame. 
     The present invention provides a backlight system, which comprises: a back frame and semiconductor light source; wherein the back frame comprising at least a first main splice element and a second main splice element; the first main splice element having one end disposed with at least two splice parts, with each of splice parts having a structure matching a corresponding end of the second main splice element; the first main splice element splicing with the corresponding end of the second main splice element through one of the splice parts; the backlight system comprising a package stent, disposed on the first main splice element or the second main splice element; the semiconductor light source being packaged directly onto the package stent. 
     According to a preferred embodiment of the present invention, the package stent being disposed with a heat dissipation layer partially or entirely. 
     According to a preferred embodiment of the present invention, the first main splice element or the second main splice element comprising a bottom plate and a side plate extending upwards from long side of the bottom plate; and the package stent is disposed on inner side of the side plate. 
     According to a preferred embodiment of the present invention, the semiconductor light source is LED light source, number of LED light source is plural. 
     According to a preferred embodiment of the present invention, the at least two splice parts are located along the length direction of the first main splice element with separating gap between the splice parts. 
     According to a preferred embodiment of the present invention, the splice part is a concave part disposed on the first main splice element having a shape matching one end of the second main splice element to accommodate one end of the second main splice element. 
     According to a preferred embodiment of the present invention, the splice part is a concave part disposed on the first main splice element, the second main splice element has convex part disposed at corresponding location on surface, and the convex part can be embedded into the concave part to splice the first main splice element and the second main splice element. 
     According to a preferred embodiment of the present invention, surface of one end of the second main splice element is disposed with at least two convex parts along the length direction of the second main splice element with separating gap. 
     According to a preferred embodiment of the present invention, bottom of the concave part of the first main splice element is disposed with a first via hole, the second main splice element has a second via hole located at corresponding location, the back frame comprises fixed element, and the fixed element passes through the first via hole and the second via hole to splice the first main splice element and the second main splice element. 
     According to a preferred embodiment of the present invention, the back frame further comprises a third main splice element and a fourth main splice element; the first main splice element, the second main splice element, the third main splice element and the fourth main splice element are all of the long stripe shape, and are spliced together in a head-to-tail manner to form a surrounding rectangular main frame of the back frame. 
     According to a preferred embodiment of the present invention, the back frame further comprises auxiliary splice element disposed inside the main frame, the auxiliary-splice element is spliced to the main frame. 
     According to a preferred embodiment of the present invention, the auxiliary splice element comprises a first auxiliary splice element and a second auxiliary splice element, two ends of the first auxiliary element are spliced respectively with at least two main splice elements selected from the first main splice element, the second main splice element, the third main splice element, and the fourth main splice element; and two ends of the second auxiliary element are spliced respectively with at least two main splice elements selected from the first main splice element, the second main splice element, the third main splice element, and the fourth main splice element. 
     According to a preferred embodiment of the present invention, two ends of the first auxiliary splice element are spliced respectively with the first main splice element and the second main splice element, disposed adjacently, and two ends of the second auxiliary splice element are spliced respectively with the third main splice element and the fourth main splice element; alternatively, two ends of the first auxiliary splice element are spliced respectively with the first main splice element and the third main splice element, disposed adjacently, and two ends of the second auxiliary splice element are spliced respectively with the first main splice element and the third main splice element, disposed adjacently. 
     According to a preferred embodiment of the present invention, the back frame comprises at least a stent, detachable from and fixed to one or more selected from the first main splice element, the second main splice element, the third main splice element, the fourth main splice element, the first auxiliary splice element, and the second auxiliary splice element. 
     The present invention provides a backlight system manufacture method, which comprises: manufacturing at least a first main splice element and a second main splice element, wherein the first main splice element having one end disposed with at least two splice parts, with each of splice parts having a structure matching a corresponding end of the second main splice element; manufacturing a package stent, disposing the package stent to the first main splice element or to the second main splice element; packaging semiconductor light source directly onto the package stent; and after packaging the semiconductor light source, selecting one of the at least two splice parts to splice with corresponding end of the second main splice element based on size of back frame. 
     According to a preferred embodiment of the present invention, the method, during or after the step of manufacturing a package stent, further comprises a step of: disposing a head dissipation layer partially or entirely in corresponding packaged semiconductor light source. 
     According to a preferred embodiment of the present invention, the step of disposing a head dissipation layer partially or entirely in corresponding package semiconductor light source is specifically as: coating heat dissipation material partially or entirely on corresponding package semiconductor light source to form the heat dissipation layer. 
     According to a preferred embodiment of the present invention, when other splice part exists between splicing location on the second main splice element and adjacent end of the first main splice element, before or after the step of selecting one of the at least two splice parts to splice with corresponding end of the second main splice element based on size of back frame, the other splice parts of the first main splice element located outside of the splicing location on the second main splice element are cut off. 
     The efficacy of the present invention is that to be distinguished from the state of the art. The backlight system, the backlight system manufacture method and the panel display device according to the present invention, by disposing at least a first main splice element and a second main splice element, the first main splice element having one end disposed with at least two splice parts, the first main splice element splicing with corresponding end of the second main splice element through one of the splice parts, simplify the mold for back frame to reduce the cost of back frame mold, and save the material for back frame to reduce the manufacture cost of panel display device. In addition, the semiconductor light source is directly packaged onto the package stent to save the material cost. 
     Furthermore, the package stent is coated with heat dissipation material partially or entirely so as to solve the heat dissipation problem of semiconductor light source. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To make the technical solution of the embodiments according to the present invention, a brief description of the drawings that are necessary for the illustration of the embodiments will be given as follows. Apparently, the drawings described below show only example embodiments of the present invention and for those having ordinary skills in the art, other drawings may be easily obtained from these drawings without paying any creative effort. In the drawings: 
         FIG. 1  is a schematic view showing the structure of a known back frame of a liquid crystal display device; 
         FIG. 2  is schematic view showing the structure of the panel display device of the first embodiment according to the present invention; 
         FIG. 3  is a schematic, view showing the structure of the back frame of the backlight system of the second embodiment according to the present invention; 
         FIG. 4  is a schematic side view showing the structure of the package stent according to the present invention; 
         FIG. 5  is a schematic view showing the structure of the back frame of the backlight system of the third embodiment according to the present invention; 
         FIG. 6  is a schematic view showing the structure of the back frame of the backlight system of the fourth embodiment according to the present invention; 
         FIG. 7  is a schematic view showing the structure of the splicing manner of the backlight system of the fifth embodiment according to the present invention; 
         FIG. 8  is a schematic view showing the first auxiliary splice element disposed diagonally on the main frame of the backlight system of the sixth embodiment according to the present invention; 
         FIG. 9  is a schematic view showing the first auxiliary splice element and the second auxiliary splice element disposed diagonally on the main frame of the backlight system of the seventh embodiment according to the present invention; 
         FIG. 10  is a schematic view showing the splice parts in the back frame of the backlight system of the eighth embodiment according to the present invention; 
         FIG. 11  is a cross-sectional view showing the first embodiment of the splice parts in  FIG. 10 ; 
         FIG. 12  is a schematic view showing the splicing manner of the splice parts in the back frame of the backlight system of the ninth embodiment according to the present invention; 
         FIG. 13  is a schematic view showing the splicing manner of the splice parts in the back frame of the backlight system of the tenth embodiment according to the present invention; 
         FIG. 14  is a schematic view showing the splicing manner of the splice parts in the back frame of the backlight system of the eleventh embodiment according to the present invention; 
         FIG. 15  is a schematic view showing the structure of the splice parts in the back frame of the backlight system of the twelfth embodiment according to the present invention; 
         FIG. 16  is a schematic view showing the structure of the splice parts in the back frame of the backlight system of the thirteenth embodiment according to the present invention; 
         FIG. 17  shows a flowchart of a backlight system manufacture method of the fourteenth embodiment according to the present invention; 
         FIG. 18  is a schematic view showing the structure of panel display device having touch screen of the fifteenth embodiment according to the present invention; 
         FIG. 19  is a schematic view showing the structure of 3D display device of the sixteenth embodiment according to the present invention; and 
         FIG. 20  is a schematic view showing the structure of plasma display device of the seventeenth embodiment according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The following provides a clear and complete description of the technical solution according to the present invention using the drawing and the embodiment. Apparently, the drawings described below show only example embodiments of the present invention, instead of all embodiments. For other embodiments based on the disclosed drawings and embodiments, and obtained by those having ordinary skills in the art without paying any creative effort are also within the scope of the present invention. 
     Refer to  FIGS. 2-4 . As shown in  FIG. 2 , a panel display device  20  of the present embodiment comprises: a backlight system  21  and a display panel  22 . Backlight system is disposed on the back of display panel  22  and supplies light to display panel  22 . 
     In the instant embodiment, backlight system  21  comprises semiconductor light source  25 , uniform light mechanism  24 , package stent  210  and back frame  23 ; where back frame  23  carries semiconductor light source  25  and uniform light mechanism  24 . When backlight system  21  is of side-emitting type, uniform light mechanism  24  is a light guide plate (LGP). When backlight system  21  is of direct-lighting type, uniform light mechanism  24  is a diffuser. Back frame  23  comprises at least a first main splice element and a second main splice element. The first main splice element and the second main splice element form main frame  27  of back frame  23 . Package stent  210  is disposed on the first main splice element or on the second main splice element. Semiconductor light source  25  is directly packaged onto package stent  210 . 
     Also refer to  FIG. 3 . A first embodiment of back frame  23  comprises first main splice element  261  and second main splice element  262 . One end of first main splice element  261  is spliced with one end of second main splice element  262 , and the other end of first main splice element  261  is spliced with the other end of second main splice element  262  to form main frame  27  of back frame  23 . First main splice element  261  and second main splice element  262  are made of aluminum or galvanized steel. In the present embodiment, first main splice element  261  and second main splice element  262  are of L shape. 
     Take package stent  210  disposed on first main splice element  261  as example. Package stent  210  and first main splice element  261  are manufactured separately. Then, package stent  210  is fixed to first main splice element  261 . Obviously, when necessary, package stent  210  can also be detached without damage from first main splice element  261 . 
     Package stent  210  and first main splice element  261  are connected fixedly, and one or more semiconductor light source is packaged directly onto package stent  210 . In the present embodiment, first main splice element  261  comprises a bottom plate (not shown) and a side plate (not shown) extending upwards from long side of the bottom plate. Package stent  210  is connected fixedly to inner wall of the side plate. Semiconductor light source  25  is LED, and the number of LEDs can be one or more. 
     According to the required illumination, uniform light mechanism  24  may have different shape, the number of package stents can be one or more, and each package stent  210  is directly packaged with one or more semiconductor light source  25 . For example, package stents  210  can be disposed on the same side of uniform light mechanism  24 , or disposed on multiple sides of uniform light mechanism  24 . Package stent  210  is restricted to any specific material, for example, package stent  210  can be made of metal, alloy or plastic. 
     Because semiconductor light source  25  is directly packaged onto package stent  210  and semiconductor light source  25  generates heat when operating, to dissipate the heat generated by semiconductor light source  25  in time, package stent  210  is partially or entirely disposed with a heat dissipation layer (not shown). For example, a part of the area or the entire area of package stent  210  is coated with a heat dissipation material. Furthermore, before fixing package stent  210  to first main splice element  261 , a heat dissipation material can be coated into package stent  210 . For example, a plurality of package stents  210  can be arranged side by side and sprayed with head dissipation material individually or altogether. Besides, to ensure the physical strength of package stent  210  to avoid accidental deformation to affect the optical effect of backlight system  21 , package stent  210  can be further disposed with one or more enhancement rib  2102 . 
     Also refer to  FIG. 5 . A second embodiment of back frame  23  comprises first main splice element  281 , second main splice element  282 , and third main splice element  283 . First main splice element  281 , second main splice element  282 , and third main splice element  283  are spliced together to form main frame  27  of back frame  23 . First main splice element  281 , second main splice element  282 , and third main splice element  283  are made of aluminum or galvanized steel. In the present embodiment, first main splice element  281  is of L shape, and second main splice element  282  and third main splice element  283  are both of long stripe shape. In the present embodiment, package stent can be disposed on first main splice element  281 , second main splice element  282 , or third main splice element  283 . The structure of package stent is similar to the first embodiment, and the description will not be repeated here. 
     Besides, back frame  23  further comprises auxiliary splice element disposed inside main frame  27  to splice with main frame  27 . 
     The following uses four main splice elements and two auxiliary splice elements to describe back frame  23  of backlight system  21  of the present invention in details. 
     Referring to  FIG. 6 ,  FIG. 6  is a schematic view showing the structure of the back frame of the backlight system according to the fourth embodiment of the present invention. As shown in  FIG. 6 , back frame  23  in this embodiment comprises: a first main splice element  231 , a second main splice element  232 , a third main splice element  233 , a fourth main splice element  234 , a first auxiliary splice element  235 , a second auxiliary splice element  236 , and stents  2371 ,  2372 ,  2373 ,  2374 ,  2375 ,  2376 ,  2377 . First main splice element  231 , second main splice element  232 , third main splice element  233  and fourth main splice element  234  are spliced together in a head-to-tail manner to form rectangular main frame  27  of back frame  23 . First auxiliary splice element  235  and second splice element  236  are for assisting splicing, disposed inside main frame  27  and spliced with main frame  27 . In the present embodiment, package stent can be disposed on first main splice element  231 , second main splice element  232 , third main splice element  233  and fourth main splice element  234 . The structure of package stent is similar to the first embodiment, and the description will not be repeated here. 
     Specifically, one end of first main splice element  231  is spliced with one end of second main splice element  232 ; the other end of second main splice element  232  is spliced with one end of third main splice element  233 ; the other end of third main splice element  233  is spliced with one end of fourth main splice element  234 ; and the other end of fourth main splice element  234  is spliced with the other end of first main splice element  231  to form rectangular main frame  27 ; wherein first main splice element  231 , second main splice element  232 , third main splice element  233  and fourth main splice element  234  are all made of aluminum or galvanized steel. In the present embodiment, first main splice element  231 , second main splice element  232 , third main splice element  233  and fourth main splice element  234  are all of long stripe shape. In other embodiments, first main splice element  231 , second main splice element  232 , third main splice element  233  and fourth main splice element  234  can all be designed as L shape, or some are of long stripe shape and the rest are of L shape. For example, as shown in  FIG. 3 , first main splice element  261  and second main splice element  262  are both of L shape; while in  FIG. 5 , first main splice element  281  is of L shape, and second main splice element  282  and third main splice element  283  are of long stripe shape. 
     In the present embodiment, back frame  23  of backlight system  21  adopts splicing connection to splice fixedly. As shown in  FIG. 7 , take the one end of first main splice element  231  spliced with one end of second main splice element  232  as example. One end of second main splice element  232  is spliced with one end of first main splice element  231 , for example, by screw, buckle or soldering to splice one end of second main splice element  232  to one end of first main splice element  231 . 
     In the present embodiment, first auxiliary splice element  235  and second auxiliary splice element  236  are disposed inside main frame  27  of back frame  23 . One end of first auxiliary splice element  235  is spliced with first main splice element  231 , and the other end of first auxiliary splice element  235  is spliced with third main splice element  233 . One end of second auxiliary splice element  236  is spliced with first main splice element  231 , and the other end of second auxiliary splice element  236  is spliced with third main splice element  233 . Second main splice element  232 , fourth main splice element  234 , first auxiliary splice element  235  and second auxiliary splice element  236  are disposed in parallel. In other embodiments, at least an auxiliary splice element can be disposed inside main frame  27 . For example, a first auxiliary splice element  235  is disposed inside main frame  27 . In addition, two ends of first auxiliary splice element  235  are spliced with two main splice elements selected from first main splice element  231 , second main splice element  232 , third main splice element  233  and fourth main splice element  234 . For example, first auxiliary splice element  235  is disposed diagonally inside main frame  27 , as shown in  FIG. 8 . Similarly, two ends of second auxiliary splice element  236  are spliced with two main splice elements selected from first main splice element  231 , second main splice element  232 , third main splice element  233  and fourth main splice element  234 . For example, two ends of first auxiliary splice element  235  are spliced with two adjacent main splice elements, i.e., first main splice element  231  and second main splice element  232 , and two ends of second auxiliary splice element  236  are spliced with two adjacent main splice elements, i.e., third main splice element  233  and fourth main splice element  234 , as shown in  FIG. 9 . 
     In the present embodiment, back frame  23  comprises seven stents  2371 ,  2372 ,  2373 ,  2374 ,  2375 ,  2376 ,  2377 ; wherein stent  2371  is fixed onto fourth main splice element  234 , stents  2372 ,  2373  are fixed onto first auxiliary splice element  235 , stent  2374  is fixed onto second auxiliary splice element  236 , stent  2375  is fixed onto second main splice element  232 , two ends of stents  2376 ,  2377  are fixed to first auxiliary splice element  235  and second auxiliary splice element  236 , respectively. In fact, the stents can be fixed onto any one or more selected from first main splice element  231 , second main splice element  232 , third main splice element  233 , fourth main splice element  234 , first auxiliary splice element  235 , and second auxiliary splice element  236 . In other embodiments, back frame  23  can be disposed with other number of stents, such as, one or more stents. In addition, the stents can be fixed onto or detached from any one or more selected from first main splice element  231 , second main splice element  232 , third main splice element  233 , fourth main splice element  234 , first auxiliary splice element  235 , and second auxiliary splice element  236 . 
     Stents  2371 ,  2372 ,  2373 ,  2374 ,  2375 ,  2376 ,  2377  are disposed with bumps (now shown) on surface. Back frame  23  can use the bumps to fix circuit board or components. 
     The following describes the mold corresponding to back frame  23 . In the present embodiment, first main splice element  231  and third main splice element  233  have the same size and the same shape, and can be manufactured by using the same stamping mold. Second main splice element  232  and fourth main splice element  234  have the same size and the same shape, and can be manufactured by using the same stamping mold. Thus, mold-sharing is possible. Therefore, back frame  23  of the present invention can be manufactured through stamping using two small-sized molds. Compared to the large-sized mold used in known techniques for manufacturing back frame  10 , the molds for back frame  23  of the present invention are smaller in size and simpler in structure to further reduce the cost of back frame. In addition, less material is used in back frame  23  of the present invention in comparison with back frame  10  of known techniques, which results in manufacture cost of panel display device  20 . 
     Referring to  FIG. 10 ,  FIG. 10  is a schematic view showing the splice parts in the back frame of the backlight system of the eighth embodiment according to the present invention. As shown in  FIG. 10 , in the present embodiment, one end of first main splice element is disposed with two splice parts. Structure of the splice parts matches one corresponding end of the second main splice element so that first main splice element can splice with second main splice element. 
     Specifically, one end of first main splice element  231  is disposed with splice parts  2311 ,  2312 . Splice parts  2311 ,  2312  are arranged with separating space along long side direction of first main splice element  231 . Splice parts  2311 ,  2312  are concave parts disposed on first main splice element  231  having shape matching one end of second main splice element  232  for accommodating one end of second main splice element  232 . As shown in  FIG. 11 , take splice part  2311  as example. Splice part  2311  is a concave part with two oppositely facing sides not penetrating one end of first main splice element  231 . Shape of the concave part is rectangular. Second main splice element  232  is of a straight stripe shape. 
     When splicing for larger size back frame  23 , splice part  2311  closer to end of first main splice element is selected and second main splice element  232  of corresponding width is also selected. Then, one end of second main splice element  232  is disposed onto concave part of splice part  2311 . Then, using screw, buckle or soldering to fix one end of second main splice element  232  to splice part  2311 . When splicing for smaller size back frame  23 , splice part  2312  farther from end of first main splice element is selected and second main splice element  232  of corresponding width is also selected. Then, one end of second main splice element  232  is disposed onto concave part of splice part  2312 . Then, using screw, buckle or soldering to fix one end of second main splice element  232  to splice part  2312 . Specifically, for example, a convex part is disposed at the corresponding location on surface of second main splice element  232 , and the convex part of second main splice element  232  is embedded into the corresponding concave part on first main splice element  231  so as to splice first main splice element  231  and second main splice element  232  together, as shown in  FIG. 12 . In addition, one end of second main splice element  232  can be disposed with at least two convex parts along long side direction of second main splice element  232 , such as, two, three or four convex parts. 
     Furthermore, the concave part of first main splice element  231  can be of a multi-step structure, and convex part of second main splice element  232  can also be of a matching multi-step structure, as shown in  FIG. 13 . In addition, as shown in  FIG. 14 , take splice part  2311  as example. Bottom of concave part of first main splice element  231  is disposed with a first via hole  2313 , and a second via hole  2312  is disposed at corresponding location on second main splice element  232 . Back frame  23  further comprises fixed element  240 . Fixed element  240  penetrates first via hole  2313  and second via hole  2321  to splice first main splice element  231  and second main splice element together. 
     As shown in  FIG. 15 , in another embodiment of the back frame of the backlight system of the present invention, splice parts  2311 ,  2312  of first main splice element  231  are of a round shape. However, in other embodiments, the shape of concave parts can be designed as triangular or other shapes. 
     As shown in  FIG. 16 , in another embodiment of the back frame of the backlight system of the present invention, splice parts  2311 ,  2312  are the concave parts with two oppositely facing sides penetrating first main splice element  231  so that one end of second main splice element  232  can move on splice parts  2311 ,  2312 . For instance, after one end of second main splice element  232  penetrates splice part  2312  and fixed together, extra part can be cut off so as to adjust length of second main splice element  232  used as a main splice element when splicing back frame  23 . 
     In actual application, the other end of first main splice element  231  and two ends of third main splice element  233  are all disposed with two splice parts, with structure similar to splice parts  2311 ,  2312 . Two ends of second main splice element  232  and two ends of fourth main splice element  234  can also be disposed or not disposed with, depending on different situations: for example:
         (1) In the first scenario, as shown in  FIG. 11 , two ends of second main splice element  232  and two ends of fourth main splice element  234  can be not disposed with any design, i.e., the ends are of same structure as other parts. In such situation, when selecting different splice parts  2311  ( 2312 ) of one end of first main splice element  231  for splicing (the other end is processed similarly), if length of back frame  23  needs to be changed accordingly, lengths of the corresponding second main splice element  232  and fourth main splice element  234  must be selected accordingly. That is, if selecting splice part  2311  close to one end of first main splice element  231  for splicing, corresponding cut-off will not be performed on second main splice element  232  and fourth main splice element  234 , or only a shorter part will be cut off. On the other hand, if selecting splice part  2312  farther from one end of first main splice element  231  for splicing, corresponding cut-off must be performed on second main splice element  232  and fourth main splice element  234 , and cut-off lengths must be adjusted according to the distance to one end of first main splice element  231 ;   (2) In the second scenario, similar to the above scenario, as shown in  FIG. 12 . The difference is that second main splice element  232  and fourth main splice element  234  use different convex parts to match first main splice element  231  and third main splice element  233 , respectively, to achieve changing width of back frame  23 . Similarly, if another splice part  2312  other than splice part  2311  closest to one end of first main splice element  231  is selected for splicing, extra length of second main splice element  232  and fourth main splice element  234  must also be cut off before or after splicing.       

     The above scenarios are also applicable to main frame  27  of back frame  23  with splicing only two L shape main splice elements. 
     In summary, first main splice element of back frame  23  of the present invention is disposed with at least two splice parts, depending on the requirement to determine number of splice parts. The embodiments describe two splice parts  2311 ,  2312 . Therefore, when disposing mold for back frame  23 , only two sets of molds are required; that is, molds for first main splice element and molds for second main splice element. A plurality of splice parts are disposed on first main splice element to obtain different sizes of back frame  23 . When splicing for back frame  23 , respective splice part is selected according to size of back frame  23 . Second main splice element is spliced to splice part of first main splice element, and extra splice part beyond splice location where first main splice element is spliced with second main splice element is cut off to obtain the required size of back frame  23 . Compared to known techniques using different molds for different sizes of back frame  10 , the present invention only requires molds for first main splice element for back frame  23 , and molds for second main splice element  28  to achieve mold-sharing among different sizes of products. Also, the Structure of molds is simple and the mold cost is reduced. 
     In above embodiments, package stents can be disposed onto one or more main splice elements. 
     As shown in  FIG. 17 , the present invention further provides a backlight system manufacture method, which comprises the following steps: 
     Step  501 : manufacturing at least a first main splice element and a second main splice element, wherein the first main splice element having one end disposed with at least two splice parts, with each of splice parts having a structure matching a corresponding end of the second main splice element. 
     Step  502 : manufacturing a package stent, disposing the package stent to the first main splice element or to the second main splice element; packaging semiconductor light source directly onto the package stent. 
     Step  503 : after packaging the semiconductor light source, selecting one of the at least two splice parts to splice with corresponding end of the second main splice element based on size of back frame. 
     In the instant embodiment, when other splice parts exist between location where second main splice element spliced with first main splice element and adjacent end of first main splice element, the extra splice parts existing between location where second main splice element spliced with first main splice element are cut off before or after the step of selecting one of the at least two splice parts to splice with corresponding end of the second main splice element based on size of back frame; wherein first main splice element is the aforementioned first main splice element and second main splice element is the aforementioned second main splice element. The description will not be repeated here. 
     According to a preferred embodiment of the present invention, the method, during or after the step of manufacturing a package stent, further comprises a step of: disposing a head dissipation layer partially or entirely in corresponding package semiconductor light source. 
     According to a preferred embodiment of the present invention, the step of disposing a head dissipation layer partially or entirely in corresponding package semiconductor light source is specifically as: coating heat dissipation material partially or entirely on corresponding package semiconductor light source to form the heat dissipation layer. 
     As shown in  FIG. 18 , panel display device  20  of the present invention further comprises a touch panel  29 , disposed on light-emitting surface of display panel  22  of panel display device  20 ; wherein panel display device  20  comprises: backlight system  21  and aforementioned display panel  22 . Backlight system  21  is disposed at back of display panel  22  to supply light to display panel  22 . 
     Backlight system  22  comprises semiconductor light source  25 , uniform light mechanism  24 , and back frame  23 ; where back frame  23  carries semiconductor light source  25  and uniform light mechanism  24 . When backlight system  21  is of side-emitting type, uniform light mechanism  24  is a light guide plate (LGP). When backlight system  21  is of direct-lighting type, uniform light mechanism  24  is a diffuser. Back frame  23  comprises at least a first main splice element and a second main splice element. The first main splice element and the second main splice element form main frame  27  of back frame  23 . 
     Obviously, backlight system  21  can also be of any structure of aforementioned embodiments of backlight system. 
     It should be noted that panel display device  20  of the present invention can be liquid crystal display device or liquid crystal TV. 
     The present invention further provides a 3D display device, as shown in  FIG. 19 . 3D display device  30  comprises liquid crystal lens grating  31 , backlight system  32  and display panel  33 ; wherein liquid crystal lens grating  31  is disposed on light-emitting surface of display panel  33 . Backlight system  32  is the backlight system in aforementioned embodiments, such as, backlight system  32  comprising back frame  23 ; wherein back frame  23  comprises at least a first main splice element and a second main splice element. The first main splice element and the second main splice element form main frame of back frame. Backlight system  32  can also be of any structure of aforementioned embodiments of backlight system, and the description will not be repeated here. 
     The present invention further provides a plasma display device  40 , as shown in  FIG. 20 . Plasma display device  40  comprises a plasma display panel  41  and a back frame  42 . Back frame  42  is disposed at back of plasma display panel  41 ; wherein back frame  42  can be the back frames of any aforementioned embodiments, and the description will not be repeated here. 
     Through the above means, the backlight system, backlight manufacture method and panel display device of present invention can reduce material cost, mold cost and solve heat dissipation problem of semiconductor light source. 
     Embodiments of the present invention have been described, but not intending to impose any unduly constraint to the appended claims. Any modification of equivalent structure or equivalent process made according to the disclosure and drawings of the present invention, or any application thereof, directly or indirectly, to other related fields of technique, is considered encompassed in the scope of protection defined by the claims of the present invention.