Abstract:
A backlight module includes a printed circuit board (PCB), and a light emitting diode (LEDs) arranged on the PCB. The PCB is configured with a fixing structure(s) for fixing the LED. The LEDs are configured with butting structures for butting with the fixing structures. The LEDs are mechanically fixed to the fixing structures of the PCB by the butting structures of the LEDs. The LEDs fixed by the fixing structures and the butting structures are removably connected, which facilitates replacement of the LEDs.

Description:
TECHNICAL FIELD 
     The present disclosure relates to the field of liquid crystal displays (LCDs), and more particularly to a backlight module, and a light emitting diode (LED) packaging structure. 
     BACKGROUND 
     As a key component of an LCD panel, a backlight module is mainly used for providing sufficient brightness and uniformly distributed light sources, to enable the LCD panel to display images. One or more LEDs are usually used as a light source of the backlight module. Optionally, a cold-cathode tube or other related structures can also be used as the light source of the backlight module. However, LEDs are widely used in typical LCDs because of the advantages of low energy consumption, long service life of LEDs. 
     In an LED backlight module, one lightbar is generally formed by soldering LED element(s) as light emitting unit(s) on a printed circuit board (PCB) by surface mount technology (SMT). If one of the LEDs is damaged or the chromaticity is not good (NG), the entire lightbar is required to be reworked in the PCI factory or scrapped. Additionally, because the damaged LED may not be able to be replaced in time, efficiency is reduced, and the reworking or scrapping and assembling directly affects manufacturing cost of LCDs. 
     SUMMARY 
     In view of the above-described problems, the aim of the present disclosure is to provide a backlight module and an LED packaging structure with low cost and convenient maintenance. 
     The aim of the present disclosure is achieved by the following technical scheme. 
     A backlight module comprises a backplane, a PCB arranged on the backplane, and LEDs arranged on the PCB. The backplane comprises a side wall(s) and a bottom plate. The PCB is positioned on the bottom plate. The LEDs are vertically arranged at an edge of the PCB, and an back of each LED is arranged close to the side will of the backplane. The PCB is configured with a first fixing structure on which a clamping slot is formed. Both two sides of a light emitting surface of the LED are configured with a second fixing structure on which a clamping strip is formed. The clamping strips on the two sides of the LED are respectively matched with and mechanically fixed to the clamping slot. An inner wall of the clamping slot is configured with convex structures. And a back surface and a bottom surface of the LED are configured with heat sinks. 
     The aim of the present disclosure can also be achieved by the following technical scheme. A backlight module comprises a PCB, and LEDs arranged on the PCB. The PCB is configured with a fixing structure(s) for fixing the LEDs. Each LED is configured with a butting structure used for butting with the fixing structure. The LED is mechanically fixed to the fixing structure of the PCB by the butting structure of the LED. 
     Preferably, the LED(s) is vertically arranged on the PCB. By vertically arranging the LED on the PCB, the light emitting surface of the LED is perpendicular to a surface of the PCB, and the PCB is positioned on a bottom plate of the backplane instead of being arranged on the side wall of the backplane, thereby increasing strength of the backplane without arranging holes for fixing the PCB in the side wall of the backplane. 
     Preferably, the backlight module comprises a backplane. The backplane comprises a side wall(s) and a bottom plate. The PCB is positioned on the bottom plate, the LEDs are vertically arranged at the edge of the PCB, and the back surfaces of the LEDs are arranged close to the side wall of the backplane. For an A value of an LCD module (distance from the light emitting surface of each LED to the edge of an active area of the LCD module), an thickness of the PCB can be increased and the optical quality can be improved by positioning the PCB on the bottom plate of the backplane and arranging the LEDs close to the side wall of the backplane. In addition, such arrangement enables the LEDs to be directly in contact with the side wall of the backplane, thereby favoring heat dissipation. 
     In one example, the fixing structure is a first fixing structure arranged on the PCB, and the first fixing structure is formed with a clamping slot. The butting structures of the second fixing structures arranged on the two opposite sides of each LED, and each of the second fixing structure is formed with a clamping strip. And the clamping strips of the two opposite sides of the LED are respectively matched with and fixed to the clamping slot. The LEDs can be directly and mechanically fixed to the PCB by matching the clamping slot with the clamping strips without any auxiliary tools. This is a convenient and quick mode. 
     Preferably, the clamping slot comprises two vertical supports which are oppositely arranged, and a connecting structure for connecting the bottom ends of the two vertical supports. The clamping slot is fixed to the PCB by the connecting structure. The clamping slot has the advantages of simple structure and convenient manufacture. 
     Preferably, the inner wall of the clamping slot is configured with convex structures. A clamping force of the clamping slot to the clamping strips of the LEDs is increased by the convex structures arranged on the inner wall. Thus, mounting reliability of LEDs is improved. 
     Preferably, the fixing structure is the clamping strip arranged on the PCB, and the butting structure is the clamping slot which is matched with the clamping strip and arranged on the LED. Optionally, the clamping slot can be arranged on the LED. Correspondingly, the clamping strip also can be arranged on the PCB. 
     Preferably, the back surface of the LED is configured with heat sinks. Relatively to the typical arrangement of arranging the heat sinks on the back surface of a lightbar (namely, the back surface of the PCB), by directly arranging the heat sinks on the back surface of the LED, the LED can directly dissipate heat through the heat sinks without conducting heat through the PCB. Thus, the efficiency of dissipating heat is enhanced. 
     Preferably, the bottom of the LED contacted with the PCB also is configured with heat sinks. Thus, the efficiency of dissipating heat is further enhanced. 
     An LED packaging structure comprises the fixing structures arranged on the PCB, and the butting structures arranged on the LEDs. And the LED is mechanically fixed to the fixing structure of the PCB by the butting structure of the LED. 
     In the present disclosure, because the fixing structure and the butting structure are respectively arranged on the PCB and the LED, the LEDs can be directly arranged on the PCB without SMT soldering. When the LEDs are packaged, only the LEDs are mechanically fixed to the PCB. Meanwhile, the LEDs minimally fixed by the fixing structures and the butting structures are removably connected, which facilitates the replacement of the LEDs. When the LED is damaged or chromaticity has certain distortion, only the damaged LED is removed and good LED(s) is mounted, without returning the entire lightbar to a factory for maintaining or scraping the entire lightbar. 
    
    
     
       BRIEF DESCRIPTION OF FIGURES 
         FIG. 1  is a simplified diagram of an LED packaging structure of a first example of the present disclosure. 
         FIG. 2  is a simplified structure diagram of an LED of a first example of the present disclosure. 
         FIG. 3  is a simplified structure diagram of a first fixing structure on a PCB of a first example of the present disclosure. 
         FIG. 4  is a simplified structure diagram of a lightbar of a first example of the present disclosure. 
         FIG. 5  is a simplified structure diagram of an LED of a second example of the present disclosure. 
         FIG. 6  is a simplified structure diagram of an LED packaging structure of a second example of the present disclosure; 
         FIG. 7  is a simplified structure diagram of a backlight module of a first example of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  and  FIG. 6  show an LED packaging structure of the present disclosure. The LED packaging structure comprises a fixing structure(s)  210  (the first fixing structure  210   a  or the third structure  210   b ) arranged on a PCB  200  and butting structures  110  (the second fixing structure or the fourth fixing structure) arranged on LEDs  100 . Each LED  100  is mechanically fixed to the fixing structure on the PCB  200  by the butting structures. 
     The present disclosure will be further described in accordance with the Figures and preferred examples. 
     Example 1 
       FIG. 1  shows one example of a packaging structure of LEDs  100  on a lightbar  300  of the present disclosure. The packaging structure comprises a first fixing structure  210   a  arranged on a PCB  200  and the second fixing structure  110   a  arranged on the LEDs  100 . The LED is of a block structure and is vertically arranged on the PCB  200 . As shown in  FIG. 2 , protruding clamping strips  111  are formed on the second fixing structures  110   a  and the second fixing structures  110   a  are positioned on the two opposite sides of the LED  100 . As shown in  FIG. 3 , the first fixing structure  210   a  comprises two vertical supports  211  which are oppositely arranged, and a connecting structure  213  that connects the two vertical supports  211 . A clamping slot  217  that is used for clamping the clamping strips  111  is formed between the two vertical supports  211 . Thus, when the LED  100  is packaged in the PCB  200 , only the clamping strips  111  on the two sides of the LED  100  are directly inserted in the first fixing structures  210   a  of the PCB  200 . Installation process is simple and does not use any complicated soldering process. 
     As shown in  FIG. 3 , the vertical supports  211  of the first fixing structure  210   a  are configured with convex structures  212 , an inner protruding structure is formed on an inner wall of the clamping slot  217  by the convex structures  212 . When the clamping strips  111  are inserted in the clamping slot  217 , the clamping strips  111  are extruded by the convex structures  212  of the vertical supports  211 , and a clamping force of the clamping slot  217  to the clamping strips  111  of the LED  100  is increased. Thus, mounting reliability of the LED  100  is improved. Optionally, because the first fixing structure  210   a  has certain elastic properties, the clamping strips  111  can be inserted in the clamping slots  217  and clamped by the two vertical supports  211 . 
     As shown in  FIG. 4 , all the LEDs  100  on the lightbar  300  are fixed to the first fixing structure  210   a  of the PCB  200  by the fixing structures arranged on the two sides of each LED  100 . Thus, when any one of the LEDs  100  on the lightbar  300  is damaged or chromaticity is not good (NG), the LED  100  which is damaged or has NG chromaticity can be directly removed without returning the lightbar  300  to a factory for maintaining or scraping the lightbar  300 . 
     In addition, the first fixing structures  210   a  and the clamping strips  111  are components for connecting the LEDs  100  with the PCB  200 . Thus, the LEDs  100  can be electrically connected with the PCB  200  by contact between the first fixing structures  210   a  and the clamping strips  111 . 
     As shown in  FIG. 7 , the packaging structure of the LEDs  100  of the first example is used in the backlight module of the LCD device. The backlight module comprises a backplane  1 , a reflector plate  2  arranged on a bottom plate  11  of the backplane  1 , a light guide panel  3  arranged on the reflector plate  2 , and a diffuser plate  4  arranged on the light guide panel  3 . A PCB  200  of the lightbar  300  is positioned on the bottom plate  11  of the backplane  1 , the LEDs  100  are vertically arranged at the edge of the PCB  200 , and back surfaces of the LED are arranged close to a side wall  12  of the backplane  1 . Thus, for an A value of an LCD module (distance from an light emitting surface of each LED to an edge of an active area of the LCD module), thickness of one PCB can be increased, and optical quality can be improved. In addition, such arrangement enables the LEDs  100  to be directly in contact with the side wall  12  of the backplane  1 , thereby favoring heat dissipation. 
     To enhance efficiency of dissipating heat of the LEDs  100 , the back surface of each LED  100  is configured with a heat sink  101 , and a bottom of the LED  100  contacting with the PCB  200  is also configured with a heat sink  102 . Thus, the efficiency of dissipating heat of the lightbar  300  is further enhanced. 
     Example 2 
     As shown in  FIG. 5  and  FIG. 6 , the second example is different from the first example in that, the fourth fixing structure  110   b  of the LED  100  is formed with a clamping slot  127  in the first example, while the third fixing structure  210   b  arranged on the PCB  200  is formed with a clamping strip  221  in the second example. In the first example (as shown in  FIG. 1 ), strength of the butting structure can be improved by arranging the clamping strips  111  on the LED  100 , while the strength of the butting structure is lower than that of the first example if the clamping strip  221  is arranged on the PCB  200  (as shown in  FIG. 6 ) as in the second example. 
     The present disclosure is described in detail in accordance with the above contents with the specific preferred examples. However, this present disclosure is not limited to the specific examples. For the ordinary technical personnel of the technical field of the present disclosure, on the premise of keeping the conception of the present disclosure, the technical personnel can also make simple deductions or replacements, and all of which should be considered to belong to the protection scope of the present disclosure.