TWI420164B - Light guiding assembly and the back light module using the same - Google Patents

Description

Light guide plate combination and backlight module having the same

The invention relates to a light guide plate, in particular to a combined light guide plate applied to a backlight module.

Referring to the first figure, it is a schematic diagram of the combination of the conventional light guide plate 10. The light guide plate 10 includes a light incident surface 12, a light exit surface 16, and a side surface 18. The light incident surface 12 is configured to allow a light to enter the light guide plate 10, and the light incident surface 12 is formed with a recess 14 adjacent to one side of the light exit surface 16. The side surface 18 is adjacent to the light-emitting surface 16 and parallel to the light-incident surface 16 , and the width of the side surface 18 is equal to the length of the light-emitting surface 16 of the groove 14 adjacent to the plane of the light-incident surface 12 . .

In the actual assembly, the light guide plate 10 has one side of the side surface 18 superposed on the groove 14 of the adjacent light guide plate 10, and the side surface 18 is flatly attached to the groove 14 adjacent to the light exit surface 16 The plane is such that the light exiting faces 16 of the adjacent light guide plates 10 are located on the same plane.

However, since the bonding surface of the first side surface 14 and the second side surface 18 is not adhered or stuck, the light guide plate 10 which is formed by stacking is not firm, and is easy to be transported. Vibrate and produce a slit. When light enters the light guide plate 10 from the light incident surface 12, the slits will generate light leakage, so that the light is guided by the light guide When the slits of the light guide plate 10 are ejected, the backlight module using the light guide plates 10 generates a distinct bright line, which causes the brightness of the entire backlight module to be uneven, and the use rate of the light is lowered.

In view of the prior art, it is an object of the present invention to provide a light guide plate assembly.

Another object of the present invention is to provide a backlight module having the above-described light guide plate combination.

To achieve the above objective, the present invention provides a light guide plate assembly, which is applied to a backlight module. The backlight module includes a back plate, a light guide plate combination, and a plurality of light emitting units. The light guide plate assembly includes a plurality of light guide plates, and the light guide plates are disposed on the back plate. Each of the light guide plates includes a light exit surface, a bottom surface, a first side surface, and a second side surface. The bottom surface is inclined at an angle to the light-emitting surface; the first side is adjacent to one side of the bottom surface, and the first side is formed adjacent to one side of the light-emitting surface and has a opening toward the first side Card slot. The second side is adjacent to the other side of the bottom surface and is formed with a projection.

The light emitting units are disposed on the first side of the light guide plates, and emit light toward the first side surfaces, the light is transmitted to the second side along the inside of each of the light guide plates; and correspondingly embedded The card slot of each of the light guide plates and the adjacent light guide plate enables the light to be transmitted within the light guide plate assembly.

In addition, the present invention further provides a backlight module, which includes a backboard, a light guide panel combination, and a plurality of light emitting units. The light guide plate combination includes a plurality of The light guide plate is disposed on the back plate, and each of the light guide plates includes a light emitting surface, a bottom surface, a first side surface and a second side surface. The bottom surface is inclined at an angle to the light-emitting surface; the first side is adjacent to one side of the bottom surface, and the first side is formed adjacent to one side of the bottom surface and has a opening toward the first side Card slot. The second side surface is adjacent to the other side of the bottom surface, and a protrusion is formed. The protrusion of each of the light guide plates is correspondingly engaged with the card slot of the adjacent light guide plate. The light emitting units are disposed on the first side of the light guide plates, and emit light toward the first side, the light is transmitted to the second side along the inside of each of the light guide plates; The light guide plates allow the light to be transmitted in adjacent light guide plates.

The light guide plate formed by splicing the light guide plates in a manner of being combined with the stacking manner described in the prior art is more solid and can avoid obvious occurrence of the light-emitting surface due to insufficient stitching. Bright line.

<Prior technology>

1‧‧‧Light guide plate

12‧‧‧Into the glossy surface

14‧‧‧ Groove

16‧‧‧Glossy

18‧‧‧ side

<present invention>

100‧‧‧Light guide plate

102‧‧‧ first side

103‧‧‧ card slot

104‧‧‧Glossy surface

106‧‧‧ second side

107‧‧‧Protruding

108‧‧‧ bottom surface

110‧‧‧ first surface

112‧‧‧ second surface

114‧‧‧ third surface

116‧‧‧Fourth surface

200‧‧‧Lighting unit

300‧‧‧ Backplane

400‧‧‧reflector

600‧‧‧Light guide plate

602‧‧‧Glossy

604‧‧‧ first side

605‧‧‧ card slot

606‧‧‧ second side

607‧‧‧protrusion

608‧‧‧ third side

609‧‧‧ Groove

610‧‧‧ fourth side

611‧‧‧Bump

612‧‧‧ bottom surface

The first figure is a schematic diagram of the combination of the conventional light guide plates.

The second figure is a perspective view of a light guide plate assembly according to a first embodiment of the present invention.

The third figure is a cross-sectional view of the light guide plate assembly of the first embodiment of the present invention.

FIG. 4 is an exploded perspective view of a backlight module according to a first embodiment of the present invention.

The fifth figure is a side view of the backlight module of the first embodiment of the present invention.

Figure 6 is a perspective view of a light guide plate according to a second embodiment of the present invention.

FIG. 7 is a schematic view showing the splicing of the light guide plate according to the second embodiment of the present invention.

Referring to the second and third figures, respectively, a perspective view and a cross-sectional view of the light guide plate assembly of the present invention. The light guide plate is used inside a backlight module, and is mainly used for guiding the direction of light to provide a light source with uniform brightness of the liquid crystal display device. The light guide plate assembly includes a plurality of light guide plates 100. Each of the light guide plates 100 includes a first side surface 102, a light exit surface 104, a second side surface 106, and a bottom surface 108. The bottom surface 108 is inclined at an angle to the light exit surface 104. The first side surface 102 is adjacent to one side of the bottom surface 108, and a side of the first side surface 102 adjacent to the light-emitting surface 104 is formed with a card slot 103 opening toward the first side surface 104; the second side surface 106 Adjacent to the other side of the bottom surface 108, the bottom surface 108 extends outwardly to form a projection 107.

The card slot 103 of each of the light guide plates 100 includes a first surface 110 substantially parallel to the bottom surface 108, a second surface 112 substantially perpendicular to the first surface 110, a second surface 112 adjacent to the second surface 112, and facing the first surface 112 A third surface 114 of a surface 110 and a fourth surface 116 adjacent to the third surface 114 and parallel to the first side surface 102.

In the actual assembly, the protruding portion 107 of each of the light guide plates 100 abuts against the second surface 112 of the adjacent light guide plate 100, and the second side surface 106 of each of the light guide plates 100 is flatly attached to the adjacent light guide plate 100. The four surfaces 116, the bottom surface 108 of each of the light guide plates 100 are in contact with the first surface 110 of the adjacent light guide plate 100.

The first side 102 of the light guide plate 100 is provided with a light emitting unit 200, and the light emitting unit 200 emits light toward the first side surface 102. Through the correspondingly fitting projections 107 and the card slots 103, the light guide plate assembly is tightly joined to avoid light. The line leaks from the junction of the light guide plates 100 to produce a bright line, causing a problem of uneven brightness of the liquid crystal display device.

Each of the light guide plates 100 is made of a material that does not absorb light, such as polymethylmethacrylate (PMMA), synthetic resin, acryl, polycarbonate (PC), polyester (Polyethylene terephthalate, PET). ), Polyolefines or glass, a smooth plate made by injection molding. Further, each of the bottom surface 108 of the light guide plate 100 is provided with a plurality of light guiding units (not shown) made of a highly reflective and non-light absorbing material, and the size and arrangement of the light guiding units are different. When the light is incident on the light guiding unit, the reflected light is led out from the light emitting surface 104 of the light guiding plate 100 at an angle contrary to the law of reflection, thereby distributing the light uniformly on the light emitting surface 104 of the light guiding plate 100.

Referring to the fourth and fifth figures, respectively, a perspective view and a cross-sectional view of a backlight module having a light guide plate 100 of the present invention. The backlight module includes the above-mentioned light guide plate combination, a plurality of light-emitting units 200, a back plate 300, and a reflection sheet 400.

The backplane 300 is the main support structure of the entire backlight module, and can also serve as a barrier for electromagnetic interference, and has the function of promoting heat dissipation and homogenizing the temperature.

The light guide plates 100 are disposed on the back plate 300, and the protrusions 107 of the light guide plates 100 are engaged with the card slots 103 of the adjacent light guide plates 100 such that the light guide plates 100 are along a specific The direction extends from one edge of the backing plate 300 to the opposite side of the edge.

The light emitting units 200 are disposed on the first side 102 of the light guide plate 100, and Each of the first side surfaces 102 emits light, and the light is transmitted to the second side surface 106 along the inside of the light guide plate 100; and is transmitted to the light guide plate 100 through the protruding portion 107 formed on the second side surface 106. The card slot 103 of the first side 102 is used to provide a uniform light source required by the backlight module. The light-emitting units 200 are composed of a plurality of light-emitting diodes.

The reflective sheet 400 is disposed between the backplane 300 and the light guide plate 100, and is mainly used for reflecting light emitted by the light emitting unit 200 but leaking the light guide plate 100 back into the light guide plate 100 to improve the use of light. effectiveness.

Referring to the sixth figure, a perspective view of a light guide plate assembly according to a second embodiment of the present invention is shown. The light guide plate assembly includes a plurality of light guide plates 600. Each of the light guide plates 600 includes a light exit surface 602, a first side surface 604, a second side surface 606, a third side surface 608, and a fourth side surface 610 and a bottom surface. 612. The bottom surface 612 is wedged at an angle to the light exiting surface; the first side surface 604 is adjacent to one side of the bottom surface 612, and the first side surface 604 is formed adjacent to one side of the bottom surface 612. The first side 604 is open with a card slot 605. The second side 606 is adjacent to the bottom surface 612 and is located on the opposite side of the first side 604, and a protrusion 607 is formed outwardly from the bottom surface 612. The third side 608 and the fourth side 610 are respectively adjacent to the other sides of the light-emitting surface 602, and perpendicular to the first side 604 and the second side 606, respectively, and the third side 608 and the fourth side Each of the 610s is formed with a recess 609 and a stud 611.

FIG. 7 is a schematic view showing the splicing of the light guide plate according to the second embodiment of the present invention. When the light guide plate 600 is actually assembled, in the X-axis direction, the protruding portion 607 of the second side surface 606 of the light guide plate 600 is a card slot of the first side surface 604 of the adjacent light guide plate 600. The 605 corresponds to the fitting and extends outward in the X-axis direction. In addition, in the Y-axis direction perpendicular to the X-axis direction, the groove 609 of the third side surface 608 of the light guide plate 600 is correspondingly fitted with the protrusion 611 of the fourth side surface 610 of the adjacent light guide plate 600, and along The Y-axis direction extends outward so that the entire light guide plates 600 are arranged in a matrix and extend outward in two predetermined directions perpendicular to each other.

In addition, the light guide plates 600 arranged in a matrix may be combined with the light emitting units 200, the back plate 300, and the reflective sheet 400 of the first embodiment of the present invention to form a backlight module. The light guide plate 600 is disposed between the back plate 300 and the reflective sheet 400, and the light guide plate 600 extends from one side of the back plate 300 along two mutually perpendicular directions to the side. side. The light emitting unit 200 is disposed on the first side surface 604 of the light guide plate 600 and emits light toward the first side surface 604. The light is transmitted to the second side surface 606 through the interior of the light guide plate 600. The three sides 608 and the fourth side 610 are further transmitted to the adjacent light guide plate 600 via the protrusion 607 on the second side 606, the groove 609 of the third side 608, and the protrusion 611 of the fourth side 610. The groove 605, the protrusion 611 and the groove 609. The light emitted by the light-emitting units 200 can be uniformly guided to the entire light guide plate assembly through the light guide plates 600 to provide a uniform surface light source of the liquid crystal display device.

In summary, the present invention utilizes correspondingly engaged card slots and projections, recesses and studs to enable a single light guide plate to be stably spliced into a larger illuminating surface in one or two specific directions. Moreover, the light guide plates are combined to form the light guide plates in a manner of being combined, and the light guide plates composed of the stacked manners described in the prior art are more solid and can be prevented from being tightly stitched. This leads to a distinct bright line on the glazed surface.

However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention should still be covered by the patent of the present invention. The scope of the scope is intended to protect.

100‧‧‧Light guide plate

102‧‧‧ first side

103‧‧‧ card slot

104‧‧‧Glossy surface

106‧‧‧ second side

107‧‧‧Protruding

Claims (22)

A light guide plate assembly is applied to a backlight module. The backlight module includes a back plate, a plurality of light emitting units, and a light guide plate combination. The light guide plate assembly includes a plurality of light guide plates, and the light guide plates are disposed on the light guide plate. Each of the light guide plates includes: a light emitting surface; a bottom surface is inclined at an angle to the light emitting surface; a first side surface is adjacent to one side of the bottom surface, and the first surface a side surface adjacent to the light-emitting surface is formed with a card slot opening toward the first side surface; and a second side surface is adjacent to the other side of the bottom surface, and a convex surface is formed to extend outwardly from the bottom surface The light emitting unit is disposed on the first side of the light guide plate and emits light toward the first side, the light is transmitted to the second side along the inside of each of the light guide plates, and Correspondingly fitting the protrusions of each of the light guide plates and the adjacent light guide plates such that the light is transmitted in the light guide plate assembly. The light guide plate assembly of claim 1, wherein the card slot of each of the light guide plates comprises a first surface substantially parallel to the bottom surface, a second surface substantially perpendicular to the first surface, and an adjacent The second surface faces the third surface of the first surface and a fourth surface adjacent to the third surface and parallel to the first surface. The light guide plate assembly of claim 2, wherein the protruding portion of each of the light guide plates abuts against a second surface of the adjacent light guide plate, and the second side of each of the light guide plates The light is applied to the fourth surface of the adjacent light guide plate such that the bottom surface of each of the light guide plates is in contact with the first surface of the adjacent light guide plate. The light guide plate assembly of claim 1, wherein the light guide plate further comprises: a third side surface adjacent to the light exit surface, and perpendicular to the first side surface on the second side surface, the third side surface The upper part is formed with a groove; a fourth side is adjacent to the light-emitting surface, and is located on the opposite side of the third side, and a protrusion is formed on the fourth side. The light guide plate assembly of claim 4, wherein the protruding portion of the first side of the light guide plate is engaged with the card slot of the second side of the adjacent light guide plate, and the third side of the light guide plate The groove is matched with the protrusion of the fourth side of the adjacent light guide plate, so that the light guide plate can extend from one side of the back plate to the opposite side of the back plate along two mutually perpendicular directions. . The light guide plate assembly of claim 4, wherein the card slot of each of the light guide plates extends from the third side to the fourth side. The light guide plate assembly of claim 4, wherein the protruding portion of each of the light guide plates extends from the third side surface to the fourth side surface. The light guide plate assembly of claim 1, further comprising a plurality of light guiding units disposed on the bottom surface of the light guide plate. The light guide plate assembly of claim 1, wherein the card slot is U-shaped or V-shaped. The light guide plate assembly of claim 1, wherein the light guide plate utilizes polymethylmethacrylate (PMMA), synthetic resin, acryl, polycarbonate, PC, and poly Polyethylene terephthalate (PET), polyolefin (Polyolefines) Made of glass or glass. A backlight module comprising: a backing plate; a light guiding plate assembly comprising a plurality of light guiding plates, wherein the light guiding plates are disposed on the backing plate, each of the light guiding plates comprises: a light emitting surface; a bottom surface, And a first side surface adjacent to one side of the bottom surface, and a side of the first side surface adjacent to the light emitting surface is formed with a card opening toward the first side surface a second side is adjacent to the other side of the bottom surface, and is formed with a protruding portion, and the protruding portion of each of the light guiding plates is correspondingly engaged with the card slot of the adjacent light guiding plate; and a plurality of light emitting portions The unit is disposed on the first side of the light guide plate, and emits light toward the first side, the light is transmitted to the second side along the interior of the light guide plate, and The light guide plate allows the light to be transmitted in the adjacent light guide plate. The backlight module of claim 11, further comprising a reflective sheet disposed between the back plate and the light guide plate assembly. The backlight module of claim 11, wherein the card slot of each of the light guide plates comprises a first surface substantially parallel to the bottom surface, a second surface substantially perpendicular to the first surface, and an adjacent The second surface faces the third surface of the first surface and a fourth surface adjacent to the third surface and parallel to the first surface. The backlight module of claim 13, wherein the protruding portion of each of the light guiding plates abuts against the second surface of the adjacent light guiding plate, and the second side of each of the light guiding plates is flat The fourth surface of the adjacent light guide plate is attached to the bottom surface of each of the light guide plates to be in contact with the first surface of the adjacent light guide plate. The backlight module of claim 11, wherein the light guide plate further comprises: a third side surface adjacent to the light emitting surface, and perpendicular to the first side surface on the second side surface, the third side surface The upper part is formed with a groove; a fourth side is adjacent to the light-emitting surface, and is located on the opposite side of the third side, and a protrusion is formed on the fourth side. The backlight module of claim 15, wherein the protruding portion of the first side of the light guiding plate is engaged with the card slot of the second side of the adjacent light guiding plate, and the third side of the light guiding plate The groove is matched with the protrusion of the fourth side of the adjacent light guide plate, so that the light guide plate can extend from one side of the back plate to the opposite side of the back plate along two mutually perpendicular directions. . The backlight module of claim 15, wherein the card slot of each of the light guide plates extends from the third side to the fourth side. The backlight module of claim 15, wherein the protruding portion of each of the light guiding plates extends from the third side to the fourth side. The backlight module of claim 11, wherein the light guide plate further comprises a plurality of light guiding units disposed on the bottom surface. The backlight module of claim 11, wherein the card slot of each of the light guide plates is U-shaped or V-shaped. The backlight module of claim 11, wherein the light guide plate utilizes polymethylmethacrylate (PMMA), synthetic resin, acryl, polycarbonate, PC, and poly Polyethylene terephthalate (PET), polyolefin (Polyolefines) Made of glass or glass. The backlight module of claim 11, wherein the light emitting unit is a light emitting diode.