Background technology
LCD (Liquid Crystal Display, liquid crystal display device) backlight module (Backlight Module)Enter light mode, respectively side incident type and directly lower light formula including two kinds.
As shown in figure 1, in the structure design of side injection type backlight module, light source 11 is arranged at the side of light guide plate 12,The light that light source 11 is sent enters light guide plate 12 from the incidence surface of light guide plate 12, and is penetrated inside it after diffusing reflection from exiting surfaceGo out, then via various blooming pieces 13, such as diffusion sheet and prismatic lens form uniform area source and are supplied to liquid crystal panel14。
As shown in Fig. 2 in the structure design of straight lower light formula backlight module, light source 21 is arranged at the lower section of light guide plate 22,The light that light source 21 is sent forms uniform area source after light guide plate 22 and various blooming pieces 23, and is supplied to liquid crystal panel24。
It can be seen that, the brightness that existing backlight module is required to blooming piece to improve light source 11 is spent with neat, but optical filmThe setting of piece is unfavorable for the reduction of backlight cost.
The content of the invention
In view of this, the present invention provides a kind of backlight module and liquid crystal display device, can reduce the optics needed for backlightDiaphragm, advantageously reduces backlight cost.
The backlight module of one embodiment of the invention, including backboard, light guide plate and light source, backboard include vertical plate body and inclinationPlate body, one end of vertical plate body is mutually fixed with the one end for tilting plate body, and tilting the other end of plate body is used to fix with liquid crystal panel,Vertical plate body is set with liquid crystal panel parallel interval, and the angle for tilting plate body and vertical plate body is obtuse angle, and light guide plate and light source are setIt is placed between vertical plate body and liquid crystal panel, the side for tilting plate body towards light guide plate is provided with reflector plate, the light guide plate bagInclude incidence surface and incidence surface exiting surface connected vertically and the bottom surface being oppositely arranged with the exiting surface, the bottom surfaceIt is provided with equally distributed site, light source and the neighbouring setting of incidence surface, exiting surface and is provided with multiple lens.
The liquid crystal display device of one embodiment of the invention, including above-mentioned backlight module.
Beneficial effect：The light that present invention design light source is sent passes through after light guide plate, then by tilting the reflector plate of plate bodyLiquid crystal panel can just be entered, increase light mixing distance, site mura (hot spot) phenomenon, the site of bottom surface of light guide plate can be avoided the occurrence ofDiffusing reflection is carried out to the light entered in light guide plate, the equal light action of diffusion sheet can be realized, the light of the lens of light guide plate to outgoingReflected to improve backlight illumination, the collection light action of prismatic lens can be realized, without setting diffusion sheet and prismatic lens, subtractedBlooming piece needed for few backlight, advantageously reduces backlight cost.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the skill of each exemplary embodiment provided by the present inventionArt scheme is clearly and completely described.In the case where not conflicting, each following embodiment and technical characteristic of the present inventionIt can be mutually combined.Also, the directional terminology of the invention used in full, such as "left", "right", is for preferablyEach embodiment is described, protection scope of the present invention is not intended to limit.
Referring to Fig. 3, being the liquid crystal display device of one embodiment of the invention.Liquid crystal display device 30 include backlight module withAnd the liquid crystal panel 50 on the light direction of backlight module is arranged at, the backlight module is used to provide the display picture of liquid crystal panel 50Required backlight, its light source 42, light guide plate 43, reflector plate 44 for including backboard 41 and being carried on backboard 41.
Backboard 41 includes vertical plate body 411 and tilts plate body 412, as shown in figure 3, vertical plate body 411 vertically prolongsSetting is stretched, vertical plate body 411 is set with the parallel interval of liquid crystal panel 50, and it is blunt to tilt the angle of plate body 412 and vertical plate body 411Angle.One end of vertical plate body 411 is mutually fixed with the one end for tilting plate body 412, is tilted the other end of plate body 412 and is used for and liquid crystal surfacePlate 50 is mutually fixed, and the side for tilting plate body 412 towards light guide plate 43 is provided with reflector plate 44.
Certainly, backboard 41 is also provided with the horizontal plate body 413 perpendicular with vertical plate body 411, the horizontal plate body 413One end mutually fixed with vertical plate body 411, the other end of horizontal plate body 413 is used to mutually fix with liquid crystal panel 50.The level boardBody 413 can be used for carrying and lightguide plate fixing 43 and light source 42, also, the side of horizontal plate body 413 towards light guide plate 43 also may be usedTo be provided with reflector plate 44.Further, the heat sink 45 and drive circuit of backlight module can be fixed on horizontal plate body 413 and carry on the backTo the side of light guide plate 43, the drive circuit can be FPCB (Flexible Printed Circuit Board, flexible printingCircuit board), and it is fixed on heat sink 45, such as drive circuit be fixed on heat sink 45 dorsad horizontal plate body 413 oneSide.
In the course of work of backlight module, drive circuit is used for switch and the brightness for controlling light source 42, and heat sink 45 is usedQuick diffusing is carried out in the heat to generations such as light source 42, drive circuits.Also, because drive circuit is fixed on heat sink 45,Rather than be fixed on the horizontal plate body 413 of backboard 41, therefore, the horizontal plate body 413 of backboard 41 need not open up fixed drive circuitScrew, the manufacturing cost of backboard 41 can be saved.In practical application scene, the backboard 41 with said structure can be oneForming structure, and the present invention can replace metal to manufacture backboard 41 using plastics, so as to reduce material cost and die sinkingCost.
Light guide plate 43 and light source 42 are arranged between the vertical plate body 411 of backboard 41 and liquid crystal panel 50.Specifically, light source42 can be arranged at light guide plate 43 close to one end of liquid crystal panel 50, and the other end of light guide plate 43 is planted and is fixed on vertical plate bodyIn 411 necks opened up, so as to prevent light leak.Certainly, reflector plate 44 can be provided with the neck, should by reflector plate 44The light leak in region is reflected into light guide plate 43, improves light utilization efficiency.
The light guide plate 43 of the present embodiment is side incident type structure, and it includes incidence surface and incidence surface light extraction connected verticallyFace and the bottom surface being oppositely arranged with exiting surface, light source 42 and the neighbouring setting of the incidence surface.With reference to shown in Fig. 4, the light extractionMultiple lens 431 are provided with face, the bottom surface is provided with equally distributed site 432.
In the course of work of backlight module, the light that light source 42 is sent enters light guide plate 43, and is being irradiated to each siteDiffusing reflection occurs after 432, irreflexive light is when reaching the exiting surface of light guide plate 43, and lens 431 are reflected to the light of outgoingTo improve backlight illumination.Fig. 3 is further regarded to, the light that light source 42 is sent is after light guide plate 43, then passes through on inclination plate body 412Reflector plate 44 can just enter liquid crystal panel 50, light mixing distance is sufficient, can avoid the occurrence of site mura phenomenons.Also, bottom surfaceThe light that enters in light guide plate 43 of 432 pairs of site carry out diffusing reflection, the equal light action of diffusion sheet (diffuser) can be realized, ledThe lens 431 of tabula rasa 43 are reflected to improve backlight illumination to the light of outgoing, can realize prismatic lens (BrightnessEnhancement film, also known as blast piece) collection light action, without setting diffusion sheet and prismatic lens, reduce backlight instituteThe blooming piece needed, advantageously reduces backlight cost.
The present invention can be by optimizing the curvature of each lens 431 so that is reached from the brightness of the light of the outgoing of light guide plate 43It is optimal.Also, in order to be supplied to the uniform area source of liquid crystal panel 50, along direction from left to right, i.e., along light source 42 towards erectingThe direction of straight panel body 411, the curvature of the lens 431 increases successively.Because curvature is bigger, focal length is shorter, and convergence effect is stronger,Therefore, the collection light action of the lens 431 away from light source 42 is stronger, so that the lens of the light of its outgoing and neighbouring light source 42The similar intensity of the light of 431 outgoing is even identical.
It should be appreciated that backlight module 30 shown in Fig. 3 is only the goal of the invention schematic diagram for illustrating the present invention, the back of the body of the inventionOptical mode group can also have other structures.For example, the manufacture material of above-mentioned light guide plate 43 can (Polycarbonate gathers for PCCarbonic ester or engineering plastics), or glass.Because the diffusion of light in glass is good in PC, therefore spot light is changedFor area source and the identical uniformity is realized, the path reflected needed for light guide plate 43 of the light in glass material is less than in PC materialsLight guide plate 43 needed for the path that reflects, therefore the thickness of light guide plate 43 can be reduced using glass material, so as to reduce wholeThe thickness of individual backlight module 30.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hairTechnical characteristic is mutual between equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, such as each embodimentWith reference to, or other related technical fields are directly or indirectly used in, it is included within the scope of the present invention.