Abstract:
The present invention provides a multi-block backlight device having light guiding to solve the problems met in the current backlight devices with high cost, difficult matching with the panels, and inefficient lighting area. The multi-block backlight device comprises a plurality of light guiding devices, the light guiding device comprises at least one incident portion, the incident portion comprises at least one light source and an incident area; at least one eave, and a diffusion portion with uniform thickness. The eave can increase effective lighting area of the multi-block backlight device, and the diffusion portion can make the multi-block backlight device easier to couple, therefore achieving cost decreasing and effective usage.

Description:
FIELD OF INVENTION 
       [0001]    The present invention relates to a backlight device; more specifically, the present invention relates to a multi-block backlight device having light guiding device. 
       BACKGROUND 
       [0002]    Backlight devices are a type of lighting device commonly used in Liquid Crystal Displays (LCDs). LCDs use backlight to increase contrast, and also makes the information displayed by the LCDs clear in a dark environment. The presently backlight light source can be Light Emitting Diode (LED), Electroluminescent Panel, Cold Cathode Fluorescent etc., the backlight light source can provide a more uniform light source when combined with a diffusion panel. When using LED as backlight light source, chrominance performance of the LCD can be increased. However, the uniformity of a backlight device is difficult to achieve. In addition, a backlight device also needs to be power saving and with low manufacturing cost. 
         [0003]    In order to solve the problems described above, the present technologies including a backlight device  100  as shown in  FIG. 1 .  FIG. 1A  is a side view of two coupled backlight devices  100 ; and  FIG. 1B  is an elevation view of two coupled backlight devices  100 . The backlight device  100  comprises a plurality of LEDs  110 ; an incident area  120  and a light emitter  130 . The plurality of LEDs  110  emit lights penetrating the incident area  120  and reflect against the bottom of the light emitter  130 , and emit through a upper surface of the light emitter  130 . A plurality of backlight devices  100  can be coupled according to their coupling characteristic, to match difference sizes of panels. However, the backlight device  100  has a wedge shape, which makes it difficult to assemble and requires high precision manufacturing. Furthermore, a single backlight device  100  needs a plurality of LEDs  110  and therefore increases the manufacturing cost of the backlight device  100 . Another present technology please refers to  FIG. 2 .  FIG. 2A  is a prospective view of a light guiding device  200  in the prior art; and  FIG. 2B  an elevation view of the light guiding device  200  in the prior art. Light guiding device  200  comprises LED  210  and light emitter  220 . Light guiding device  200  solves the problem of backlight device  100  requiring a plurality of LED. However, the effective lighting area of light guiding device  200  is shown by broken line in  FIG. 2B , and light guiding device  200  still has areas that do not emit light. Therefore, light guiding device  200  is not effectively used. Additionally, light guiding device  200  cannot be coupled together to form a backlight panel; therefore the manufacturing cost is increased. 
         [0004]    Therefore, it requires a backlight device to solve the problems mentioned above, which are high cost, difficult to match with panel sizes and unable to effectively use the lighting area. 
       SUMMARY OF INVENTION 
       [0005]    In order to solve the above-mentioned problems, the present invention provides a light guiding device, comprising at least one incident portion with at least one light source and an incident area; a diffusion portion having uniform thickness; and at least one eave connected to the diffusion portion to form a light output surface of the light guiding device. 
         [0006]    The present invention provides a multi-block backlight device, comprising a plurality of above-mentioned light guiding device. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0007]      FIG. 1A  is a side view of two coupled backlight devices of the prior art. 
           [0008]      FIG. 1B  is an elevation view of two coupled backlight devices of the prior art. 
           [0009]      FIG. 2A  is a prospective view of a light guiding device in the prior art. 
           [0010]      FIG. 2B  is an elevation view of the light guiding device in the prior art. 
           [0011]      FIG. 3  is a prospective view of a light guiding device according to the present invention 
           [0012]      FIG. 4  is a prospective view of another light guiding device according to the present invention 
           [0013]      FIG. 5  is a prospective view of another light guiding device according to the present invention. 
           [0014]      FIG. 6  is a zoom-in view of an incident portion of a light guiding device. 
           [0015]      FIG. 7  is a prospective view of another light guiding device according to the present invention. 
           [0016]      FIG. 8  is a prospective view of another light guiding device according to the present invention. 
           [0017]      FIG. 9  is a prospective view of another light guiding device according to the present invention. 
           [0018]      FIG. 10  is a prospective view of backlight device according to the present invention. 
           [0019]      FIG. 11  is a prospective view of a multi-block backlight device according to the present invention. 
           [0020]      FIG. 12  is a prospective view of another multi-block backlight device according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0021]      FIG. 3  is a prospective view of a light guiding device  300  according to the present invention. The light guiding device  300  comprises an incident portion  310 ; a diffusion portion  320  and an eave  330 ; wherein the incident portion  310  comprises a light source  340  and an incident area  350 . The incident portion  310  is connected to the diffusion portion  320 , and the incident portion  310  is at a corner of the light guiding device  300 . The eave  330  is above the incident portion  310 , and a surface of the eave  330  and a surface of the diffusion portion  320  together forms a surface of the light guiding device  300 . The diffusion portion  320  has uniform thickness. And the light source  340  of the incident area  350  is formed by one or more LEDs. 
         [0022]    The light source  340  emits lights that pass through the incident portion  310  and enter the diffusion portion  320 . In addition, since the eave  330  is connected to the diffusion portion  320 , lights diffused from the diffusion portion  320  enter the eave  330 , diffuse from a bottom side of the eave  330  and uniformly emit out from an upper surface. Therefore, the effective lighting area of the light guiding device  300  in the present invention is the entire surface, and only one light source  340  is provided. Therefore, achieving cost decreasing and effective usage of the light guiding device  300 . 
         [0023]      FIG. 4  is a prospective view of another light guiding device  400  according to the present invention. Light guiding device  400  is similar to the above-mentioned light guiding device  300 , with the differences being that light guiding device  400  has two incident portions  410   a  and  410   b , and two eaves  430   a  and  430   b  respectively disposed at two opposite corners of light guiding device  400 , which allows the light guiding device  400  to provide a more uniform light output. 
         [0024]      FIG. 5  is a prospective view of another light guiding device  500  according to the present invention. Light guiding device  500  is similar to the above-mentioned light guiding device  300 , with the differences being that an upper surface of incident area  550  of light guiding device  500  is a parabolic surface. As shown in  FIG. 6 ,  FIG. 6  is a zoom-in view of incident portion  510  of light guiding device  500 . Light source  540  uses the parabolic surface of incident area  510  to reflect light, and light enters diffusion portion  520  after reflection. Lights entered from reflection can make an entire surface of light guiding device  500  glow, and provide a more uniform light source, which increases coupling efficiency in incident portion  510  and hence increases efficiency in light usage. 
         [0025]      FIG. 7  is a prospective view of another light guiding device  700  according to the present invention. Light guiding device  700  is similar to the above-mentioned light guiding device  500 , with the differences being that light guiding device  400  has two incident portions  710   a  and  710   b , and two eaves  730   a  and  730   b  respectively disposed at two opposite corners of light guiding device  700 , which allows the light guiding device  700  to provide a more uniform light output. 
         [0026]      FIG. 8  is a prospective view of another light guiding device  800  according to the present invention. Light guiding device  800  comprises an incident portion  810 ; a diffusion portion  820  and an eave  830 ; wherein the incident portion  810  comprises at least one light source  840  and incident area  850 , and light source  840  can be composed of one or more LEDs. Incident portion  810  is connected to diffusion portion  820  and incident portion  810  is on one side of light guiding device  800 . The eave  830  is above the incident portion  810 , and a surface of the eave  830  and a surface of the diffusion portion  820  together form a surface of the light guiding device  800 . The diffusion portion  820  has uniform thickness. 
         [0027]    The light source  840  emits lights that pass through the incident portion  810  and enter the diffusion portion  820 . In addition, since the eave  830  is connected to the diffusion portion  820 , lights diffused from the diffusion portion  820  enter the eave  830 , diffuse from a bottom side of the eave  830  and uniformly emit out from an upper surface. Therefore, the effective lighting area of the light guiding device  800  in the present invention is the entire upper surface, achieving cost decreasing and effective usage of the light guiding device  800 . 
         [0028]      FIG. 9  is a prospective view of another light guiding device  900  according to the present invention. Light guiding device  900  comprises an incident portion  910 ; a diffusion portion  920  and an eave  930 ; wherein the incident portion  910  comprises at least one light source  940  and incident area  950 , and light source  940  can be composed of one or more LEDs. Incident portion  910  is connected to diffusion portion  920  and incident portion  910  is on a side of light guiding device  900 . The eave  930  is on the opposite side of incident portion  910 , and a surface of the eave  930  and a surface of the diffusion portion  920  together forms a surface of the light guiding device  900 . The diffusion portion  920  has uniform thickness. 
         [0029]    Diffusion portion  920  of light guiding device  900  has a uniform thickness, which allows easy assembly without high precision manufacturing techniques; therefore significantly reduces manufacturing cost. And eave  930  is connected to diffusion portion  920 , lights diffused from the diffusion portion  920  enter the eave  930 , diffuse from a bottom side of the eave  930  and uniformly emit out from an upper surface. This does not limit the effective lighting area of light guiding device  900 . 
         [0030]      FIG. 10  is a prospective view of a backlight device  1000  according to the present invention. Backlight device  1000  comprises a light guiding device  1010 ; a diffusion device  1020  and a reflecting device  1030 . Wherein light guiding device  1010  shown is light guiding device  300  or any one of light guiding devices described above. As shown in  FIG. 10 , diffusion device  1020  is disposed above light guiding device  1010  and light guiding device  1010  is disposed above reflecting device  1030 . Lights emitted from light guiding device  1010  in all directions can be reflected to diffusion device  1020  by reflecting device  1030 , or direct to diffusion device  1020  before emitting through diffusion device  1020 . Backlight device  1000  can further comprise a side-reflecting device  1040  for increasing light usage efficiency, so that light emitted from light guiding device  1010  is able to uniformly reflect to diffusion device  1020 . 
         [0031]      FIG. 11  is a prospective view of a multi-block backlight device  1100  according to the present invention, comprising 9 backlight devices  1000  as described above. Multi-block backlight device  1100  meets the different size requirement by coupling a plurality of backlight devices  1000 , and because of backlight devices  1000  are uniformly shaped, coupling each with another can be easily done.  FIG. 11  displays only a multi-block backlight device  1100  formed with backlight device  1000  of light guiding device  300 , wherein light guiding device can also be light guiding device  300 ,  400 ,  500 ,  700  or  800 . 
         [0032]      FIG. 12  is a prospective view of another multi-block backlight device  1200  according to the present invention, comprising backlight device  1000  formed of 6 light guiding devices  900 . Multi-block backlight device  1200  meets the different sizes requirement by coupling a plurality of backlight devices  1000 , and because of backlight devices  1000  are uniformly shaped, coupling each with another can be easily done. 
         [0033]    Although the technical contents and features of the present invention are disclosed as above, persons skilled in the art should practice this invention with necessary modifications without departing from scope of the present invention. Therefore, the scope of the present invention is not limited to disclose embodiments; modifications and alternations without departing from scope of the present invention shall be seen as covered by those claimed.