CN103953875A - Straight down type backlight module and display device - Google Patents
Straight down type backlight module and display device Download PDFInfo
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- CN103953875A CN103953875A CN201410158528.1A CN201410158528A CN103953875A CN 103953875 A CN103953875 A CN 103953875A CN 201410158528 A CN201410158528 A CN 201410158528A CN 103953875 A CN103953875 A CN 103953875A
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- 230000003287 optical effect Effects 0.000 claims abstract description 54
- 230000005142 aphototropism Effects 0.000 claims description 40
- 239000004973 liquid crystal related substance Substances 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 19
- 230000007547 defect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 11
- 238000004088 simulation Methods 0.000 description 8
- 238000005286 illumination Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
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Abstract
The embodiment of the invention provides a straight down type backlight module and a display device and relates to the technical field of display. While the backlight effect and the support supporting function are realized, the defects that the brightness value difference between a light spot central region and a support top region is larger, and the light ray uniformity of a backlight source is poorer in the prior art are overcome, and the display effect of the display device is improved. The straight down type backlight module comprises a backplate, a light source, a support, a lens and an optical module, wherein the light source is arranged on the backplate, the lens is arranged on the light source, the support is arranged on the out-light surface of the top of the lens, and the top of the support is used for supporting the optical module.
Description
Technical field
The present invention relates to Display Technique field, relate in particular to a kind of down straight aphototropism mode set and display unit.
Background technology
Along with the development of Display Technique, the application of liquid crystal display in people's life is more and more extensive.Liquid crystal display in liquid crystal display itself is non-luminous, in order to realize display effect, need to provide backlight to it, in prior art, the backlight of liquid crystal display provided by backlight module conventionally, and backlight module is divided into again according to the difference of light inlet mode: side-light backlight module and down straight aphototropism mode set.
As shown in Figure 1, down straight aphototropism mode set structure of the prior art generally comprises backboard 10 and the optical module 11 being oppositely arranged, be arranged at support 12, light source 13 on backboard 10, be arranged on the lens 14 on light source 13, the normal LED(light emitting diode that adopts of light source 13 of the prior art) light source, support 12 is arranged between light source 13 and light source 13, and the impact for fear of support on light adopts transparent material to make support conventionally.
The inventor finds in implementing prior art: the transparent material of support all has certain refractive index, this causes light can produce some deviations through in support, the light that makes script directive prop up top of the trellis can move to the direction away from a top of the trellis, and this has just caused the brightness of support top area to be less than the brightness of neighboring area; Although having adopted lens in prior art scheme disperses the light of LED light source, the exiting surface of lens is positioned at the top of lens, but as shown in Figure 2, the light of dispersing out from lens still can form a hot spot 20, the central area brightness of hot spot 20 is higher, therefore the brightness value between the central area of hot spot and the top area of support differs larger, makes the light homogeneity of backlight poor, affects final display effect.
Summary of the invention
Embodiments of the invention provide a kind of down straight aphototropism mode set and display unit, in can solving prior art when realizing backlight effect and stent support effect by the technical scheme in employing the present invention, between spot center region and support top area, brightness value differs larger, the poor defect of light homogeneity of backlight, can improve the display effect of display unit.
For achieving the above object, embodiments of the invention adopt following technical scheme:
Embodiments of the invention provide a kind of down straight aphototropism mode set, comprise backboard, light source, support, lens and optical module, described light source is arranged on described backboard, and described lens are arranged on described light source, described support is arranged on the exiting surface at described lens top, optical module described in the top braces of described support.
The side surface of described support is light reflection surface.
The bottom of described support is light tight portion.
The side surface of described support is elliptic curve in the cross section by support axis.
The side surface of described support is circular curve in the cross section by support axis.
Described support is cone.
The side surface of described support is hyperbola in the cross section by support axis, between the side surface of described support and the top of described support, is rounding off.
The top of described support is curved surface.
Described light reflection surface is reflectance coating or reflector plate.
The embodiment of the present invention provides a kind of display unit, comprises liquid crystal panel and backlight module, and described liquid crystal panel is fixed on described backlight module exiting surface, and described backlight module is the down straight aphototropism mode set with above-mentioned arbitrary characteristics.
The embodiment of the present invention provides a kind of down straight aphototropism mode set and display unit, comprise backboard, light source, support, lens and optical module, described light source is arranged on described backboard, and described lens are arranged on described light source, described support is arranged on the exiting surface at described lens top, optical module described in the top braces of described support.Because the light that LED light source sends is lambertian distribution, light is more concentrated directly over LED light source, so the light that LED light source scioptics center is penetrated is higher than peripheral region, these light sources from the outgoing of region, lens centre are concentrated in the central area of hot spot, make the brightness in spot center region higher, in the down straight aphototropism mode set and display unit providing in technical solution of the present invention, by the support arranging on the exiting surface of lens, stopped the light from the outgoing of lens exiting surface to spot center region originally, this part light light path after a series of reflection and refraction changes and away from the central area of hot spot, thereby reduced the brightness in spot center region, and the position between lens and lens does not arrange support, the brightness of the top area of former support can be lowered, thereby improved the light homogeneity of backlight, make display unit have good display effect.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is down straight aphototropism mode set structural representation of the prior art;
Fig. 2 is light source hot spot schematic diagram of the prior art;
The down straight aphototropism mode set structural representation that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the lens that Fig. 4 provides for the embodiment of the present invention;
The structural representation of the support that Fig. 5 provides for the embodiment of the present invention;
The lens that Fig. 6 provides for the embodiment of the present invention and the structural representation of holder combination;
The down straight aphototropism mode set light transmission schematic diagram one that Fig. 7 provides for the embodiment of the present invention;
The support axis schematic cross-section one excessively that Fig. 8 provides for the embodiment of the present invention;
The oval schematic diagram of the formation support that Fig. 9 provides for the embodiment of the present invention;
The not increase support simulation hot spot schematic diagram that Figure 10 provides for the embodiment of the present invention;
The increase support simulation hot spot schematic diagram one that Figure 11 provides for the embodiment of the present invention;
The support axis schematic cross-section two excessively that Figure 12 provides for the embodiment of the present invention;
Two round intersection schematic diagrames of the formation support that Figure 13 provides for the embodiment of the present invention;
The increase support simulation hot spot schematic diagram two that Figure 14 provides for the embodiment of the present invention;
The support axis schematic cross-section three excessively that Figure 15 provides for the embodiment of the present invention;
The hyperbola schematic diagram of the formation support that Figure 16 provides for the embodiment of the present invention;
The increase support simulation hot spot schematic diagram three that Figure 17 provides for the embodiment of the present invention;
The down straight aphototropism mode set light transmission schematic diagram two that Figure 18 provides for the embodiment of the present invention;
The down straight aphototropism mode set light transmission schematic diagram three that Figure 19 provides for the embodiment of the present invention;
The increase support simulation hot spot schematic diagram four that Figure 20 provides for the embodiment of the present invention.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-
Embodiments of the invention provide a kind of down straight aphototropism mode set, as shown in Figure 3, comprise backboard 30, light source 32, support 33, lens 34 and optical module 31, light source 32 is arranged on backboard 30, lens 34 are arranged on light source 32, and support 33 is arranged on the exiting surface 340 at lens top, the top 331 support of optical assemblies 31 of support.
Wherein, optical module 31 comprises blooming piece and diffuser plate from top to bottom successively, and the top 331 of support is inconsistent with support of optical assembly 31 with diffuser plate, describes in Fig. 3 and is marked for convenience.
Further, the side surface of support is light reflection surface.
Concrete, as shown in Figure 3, the side surface 332 of support is light reflection surface, so that be irradiated to the light reflection of the side surface 332 of support, the area of bottom 330 cross sections of support is greater than the area of top 331 cross sections of support.
Further, the bottom of support is light tight portion.
It should be noted that, the bottom that the bottom 330 of support can be support for light tight portion is set to reflection layer, the bottom that can be also support is set to light absorbing zone, can also be to choose opaque material to make support, so that the bottom of support is light tight, the embodiment of the present invention is not done concrete restriction to this.
Wherein, as shown in Figure 4, lens 34 top concave surfaces are exiting surface to the structure of lens 34, and exiting surface can be free form surface; The structure of support 33 as shown in Figure 5; As shown in Figure 6, the bottom of support is connected with the exiting surface of lens the structure of lens 34 and support 33 combinations, and the bottom of support can be also that other mode is fixed on lens by being adhesively fixed on lens, and the embodiment of the present invention does not limit this.
Further, described light reflection surface is reflectance coating or reflector plate.
Concrete, the side surface of support is light reflection surface, this light reflection surface can be to apply reflectance coating on the side surface of support, and can be also reflector plate is set, can also be that the side surface of support is directly made to reflecting surface, the present embodiment does not limit this.
Concrete, for the light transmission that makes to stop through frame bottom is to optical module, reflecting layer is set on backboard conventionally.As shown in Figure 7, propagation in the down straight aphototropism mode set that light provides in the embodiment of the present invention, line with arrow in figure represents to propagate light, as can be seen from Figure 7, in the light of light source outgoing, the stopping of bottom that a part can be passed through from the light of region, lens centre outgoing support is reflected, be transferred on reflecting layer 35, after the reflection in reflecting layer 35 back into being mapped in lens 34, there is total reflection in the side at lens 34, finally from the exiting surface of lens 34, reflect, when light is irradiated to the side surface of support 33, reflection through support 33 side surfaces departs from original direction, finally be irradiated on optical module 31, the light in another part directive spot center region is directly incident on the side of lens 34 and reflects from light source 33 sends, on upper surface (being exiting surface) by lens 34, reflect, when light is irradiated to the side surface of support 33, reflection through support 33 side surfaces, is finally irradiated on optical module 31, in sum, because support has stopped from the light of region, lens centre outgoing, make light through reflecting layer and the refraction of lens, reflection, pass through again the reflected illumination on bracket side surface to optical module, spread the light of light source outgoing, thereby the brightness in the spot center region that the light that has reduced light source outgoing forms, the side surface of described support is light reflection surface, the effect simultaneously with reflection is reflected a part of light in directive spot center region in prior art, further reduced the brightness in spot center region, solved the poor problem of homogeneity of backlight, improved the display effect of display unit.
The side surface with light reflection surface of described support can will originally be radiated at the part light reflection of hot spot inside to the periphery of hot spot, and then increased the area of hot spot, this point has well been described in the simulation drawing of hot spot effect in embodiment, the brightness in the region between the hot spot that any two light sources produce is less than the brightness of spot area, facula area also can make the brightness in the region between two hot spots increase to some extent when expanding, can further improve the light homogeneity of backlight like this, and then obtain better display effect.
It should be noted that, only provided the route of transmission of several exemplary light in figure, the propagation of other light can be with reference to above-mentioned explanation, and the present embodiment does not enumerate description at this.
In backlight module of the prior art in order to prevent that optical module from subsiding, at least one supporting construction need to be set between backboard and optical module, in order not affect the propagation of light in backlight module, be conventionally set to transparent configuration, conventionally adopt transparent material to make support, but transparent material all has certain refractive index, this causes light can produce some deviations through in support, this light that makes script directive prop up top of the trellis can move to the direction away from a top of the trellis, this has just caused the brightness of support top area to be less than the brightness of neighboring area, and the embodiment of the present invention provides support in backlight module to be arranged on lens and is opaque structure, this support can support of optical assembly, when realizing supporting role, reduced the brightness in spot center region.
The embodiment of the present invention provides a kind of down straight aphototropism mode set, comprise backboard, light source, support, lens and optical module, described light source is arranged on described backboard, and described lens are arranged on described light source, described support is arranged on the exiting surface at described lens top, optical module described in the top braces of described support.Because the light that LED light source sends is lambertian distribution, light is more concentrated directly over LED light source, so the light that LED light source scioptics center is penetrated is higher than peripheral region, these light sources from the outgoing of region, lens centre are concentrated in the central area of hot spot, make the brightness in spot center region higher, in the down straight aphototropism mode set providing in technical solution of the present invention, by the support arranging on the exiting surface of lens, stopped the light from the outgoing of lens exiting surface to spot center region originally, this part light light path after a series of reflection and refraction changes and away from the central area of hot spot, thereby reduced the brightness in spot center region, and the position between lens and lens does not arrange support, the brightness of the top area of former support can be lowered, thereby improved the light homogeneity of backlight, make display unit have good display effect.
Embodiment bis-
Embodiments of the invention provide a kind of down straight aphototropism mode set, as shown in Figure 3, comprise backboard 30, light source 32, support 33, lens 34 and optical module 31, light source 32 is arranged on backboard 30, lens 34 are arranged on light source 32, and support 33 is arranged on the exiting surface 340 at lens top, the top 331 support of optical assemblies 31 of support.
Wherein, optical module 31 comprises blooming piece and diffuser plate from top to bottom successively, and the top 331 of support is inconsistent with support of optical assembly 31 with diffuser plate, describes in Fig. 3 and is marked for convenience.
Further, the side surface of support is light reflection surface.
Concrete, as shown in Figure 3, the side surface 332 of support is light reflection surface, so that be irradiated to the light reflection of the side surface 332 of support, the area of bottom 330 cross sections of support is greater than the area of top 331 cross sections of support.
Further, the bottom of support is light tight portion.
It should be noted that, the bottom that the bottom 330 of support can be support for light tight portion is set to reflection layer, the bottom that can be also support is set to light absorbing zone, can also be to choose opaque material to make support, so that the bottom of support is light tight, the embodiment of the present invention is not done concrete restriction to this.
In a kind of possible implementation, the side surface of described support is elliptic curve in the cross section by support axis.
Concrete, the side surface of described support at the sectional view by support axis as shown in Figure 8, the axis that in figure, dotted line is support, side surface is elliptic curve 81 in the cross section by support axis.The top of this support is curved surface.Wherein, obtain the method for this support, as shown in Figure 9, get an ellipse, setting this oval semi-major axis is a, and semi-minor axis is b, in figure, oval heavy line part is rotated one week formed structure around its major axis A B and is support, and the value of a is for being greater than 0 and be less than cavity thickness D; The value of b for be greater than 0 and be less than lens place plane diameter of a circle r(as shown in Figure 4), cavity thickness D is the vertical range (as shown in Figure 3) between backboard and optical module.
It should be noted that, in Fig. 9, oval heavy line part can be oval half, can be also 1/3rd oval places, can also be other value, and the present embodiment does not limit this.
Exemplary, if getting oval semi-major axis long is 12mm, semi-minor axis is long is 2.5mm, this ellipse, around its semi-major axis formation support that rotates a circle, in the situation that other condition is constant, is arranged on this support on lens, the bottom of support is connected with the exiting surface of lens, by optical simulation software, to increasing support on lens, do not simulate with the hot spot increasing after support, as shown in Figure 10, Figure 11, in figure, the scale in left side is illuminance value (W/m
2) with the light and shade corresponding relation of hot spot, darkness deepens for hot spot from top to bottom, corresponding illuminance value is increasing, in figure, right side is hot spot coordinate figure, X, the unit of Y coordinate is millimeters(millimeter), Figure 10 is the simulation hot spot figure while not increasing support, darkness deepens by export-oriented center for hot spot, be that hot spot is increasing by the illuminance value at export-oriented center, in figure, central point illuminance is 4200 to the maximum, Figure 11 is for increasing the simulation hot spot figure after support, in figure, central point illuminance is 1900, compare when not increasing support, by obtaining increasing the diameter of hot spot after support after optics software simulation, increase 100%, central point illumination is reduced to 1900 by the analogue value 4200.According to analog result, can learn: spot center brightness value reduces, it is large that facula area becomes, because be subject to stopping of support from the light of region, lens centre outgoing after support is set on lens, refraction, reflection through lens and bracket side surface are spread, make the brightness of hot spot zones of different carry out distribution again, the light reflection surface on bracket side surface also reflects a part of light in directive spot center region, further reduce the brightness in spot center region, thereby solved the poor problem of homogeneity of backlight.
For this support is arranged on to the backlight module on lens, the direction of propagation of light in this backlight module can reference example one in Fig. 7 and above-mentioned for Fig. 7 in the description of light transmission, the present embodiment does not repeat them here.
Embodiment tri-
Embodiments of the invention provide a kind of down straight aphototropism mode set, as shown in Figure 3, comprise backboard 30, light source 32, support 33, lens 34 and optical module 31, light source 32 is arranged on backboard 30, lens 34 are arranged on light source 32, and support 33 is arranged on the exiting surface 340 at lens top, the top 331 support of optical assemblies 31 of support.
Wherein, optical module 31 comprises blooming piece and diffuser plate from top to bottom successively, and the top 331 of support is inconsistent with support of optical assembly 31 with diffuser plate, describes in Fig. 3 and is marked for convenience.
Further, the side surface of support is light reflection surface.
Concrete, as shown in Figure 3, the side surface 332 of support is light reflection surface, so that be irradiated to the light reflection of the side surface 332 of support, the area of bottom 330 cross sections of support is greater than the area of top 331 cross sections of support.
Further, the bottom of support is light tight portion.
It should be noted that, the bottom that the bottom 330 of support can be support for light tight portion is set to reflection layer, the bottom that can be also support is set to light absorbing zone, can also be to choose opaque material to make support, so that the bottom of support is light tight, the embodiment of the present invention is not done concrete restriction to this.
In a kind of possible implementation, the side surface of described support is circular curve in the cross section by support axis.
Concrete, the side surface of described support at the sectional view by support axis as shown in figure 12, the axis that in figure, dotted line is support, the side surface of described support is circular curve 121 in the cross section by support axis.The top of this support is curved surface.Wherein, obtain the method for this support, as shown in figure 13, get two identical circles of radius and intersect, partly around the axle EF perpendicular to two circle center line connectings, being rotated one week resulting structure is this support to get its crossing heavy line.Suppose that two radius of a circles are R, as shown in Figure 3, straight-down negative module cavity thickness is D, the thickness of the mid portion of lens is d, the span of d is less than D for being greater than 0, and frame bottom cross section diameter of a circle is H, and H is the distance between KL in Figure 13, cavity thickness D is the vertical range between backboard and optical module, and the span of H is less than lens place plane diameter of a circle r(as shown in Figure 4 for being greater than 0).
According to right angled triangle MEI, the pass on its three limit is, ME
2=EI
2+ MI
2
Can draw:
Above formula is simplified and can be obtained:
From above formula, if the thickness D of cavity is changeless, R is the interior thickness d about lens, the function of frame bottom cross section diameter of a circle H.If the interior thickness of known lens is d, and the frame bottom cross section diameter of a circle H needing, can calculate R, two round intersection of getting this radius and be R are rotated and can be obtained support.
It should be noted that, in Figure 13, two crossing heavy line parts of circle can be two round intersection 1/2nd places, can be also 1/3rd places of two round intersection, can also be other values, and the present embodiment does not limit this.
Exemplary, getting the circle that two radiuses are 150mm intersects, intersection intercepting width is 5mm, and the length of KL is 5mm, gets crossing part and is rotated and obtains support, under backlight module cavity thickness and the immovable prerequisite of lens shape, this support is arranged on lens, and the bottom of support is connected with lens exiting surface, by optical simulation software, to increasing support, does not simulate with the hot spot increasing after support, as shown in figure 14, in figure, the scale in left side is illuminance value (W/m
2) with the light and shade corresponding relation of hot spot, darkness deepens for hot spot from top to bottom, corresponding illuminance value is increasing, in figure, right side is hot spot coordinate figure, the unit of X, Y coordinate is millimeters(millimeter), in figure, central point illuminance is 3400, the hot spot of Figure 10 does not compare when increasing support, by the spot diameter that obtains increasing after optics software simulation after support, increase 30%, central point illuminance reduces by 3400 by the analogue value 4200.According to analog result, can learn: spot center brightness value reduces, it is large that facula area becomes, because be subject to stopping of support from the light of region, lens centre outgoing after support is set on lens, refraction, reflection through lens and bracket side surface are spread, make the brightness of hot spot zones of different carry out distribution again, the light reflection surface on bracket side surface also reflects a part of light in directive spot center region, further reduce the brightness in spot center region, thereby solved the poor problem of homogeneity of backlight.
For this support is arranged on to the backlight module on lens, the direction of propagation of light in this backlight module can reference example one in Fig. 7 and for Fig. 7 in the description of light transmission, the present embodiment does not repeat them here.
The embodiment of the present invention provides a kind of down straight aphototropism mode set, comprise backboard, light source, support, lens and optical module, described light source is arranged on described backboard, and described lens are arranged on described light source, described support is arranged on the exiting surface at described lens top, optical module described in the top braces of described support.Because the light that LED light source sends is lambertian distribution, light is more concentrated directly over LED light source, so the light that LED light source scioptics center is penetrated is higher than peripheral region, these light sources from the outgoing of region, lens centre are concentrated in the central area of hot spot, make the brightness in spot center region higher, in the down straight aphototropism mode set providing in technical solution of the present invention, by the support arranging on the exiting surface of lens, stopped the light from the outgoing of lens exiting surface to spot center region originally, this part light light path after a series of reflection and refraction changes and away from the central area of hot spot, thereby reduced the brightness in spot center region, and the position between lens and lens does not arrange support, the brightness of the top area of former support can be lowered, thereby improved the light homogeneity of backlight, make display unit have good display effect.
Embodiment tetra-
Embodiments of the invention provide a kind of down straight aphototropism mode set, as shown in Figure 3, comprise backboard 30, light source 32, support 33, lens 34 and optical module 31, light source 32 is arranged on backboard 30, lens 34 are arranged on light source 32, and support 33 is arranged on the exiting surface 340 at lens top, the top 331 support of optical assemblies 31 of support.
Wherein, optical module 31 comprises blooming piece and diffuser plate from top to bottom successively, and the top 331 of support is inconsistent with support of optical assembly 31 with diffuser plate, describes in Fig. 3 and is marked for convenience.
Further, the side surface of support is light reflection surface.
Concrete, as shown in Figure 3, the side surface 332 of support is light reflection surface, so that be irradiated to the light reflection of the side surface 332 of support, the area of bottom 330 cross sections of support is greater than the area of top 331 cross sections of support.
Further, the bottom of support is light tight portion.
It should be noted that, the bottom that the bottom 330 of support can be support for light tight portion is set to reflection layer, the bottom that can be also support is set to light absorbing zone, can also be to choose opaque material to make support, so that the bottom of support is light tight, the embodiment of the present invention is not done concrete restriction to this.
In a kind of possible implementation, the side surface of described support is hyperbola in the cross section by support axis.
Concrete, the side surface of described support at the sectional view by support axis as shown in figure 15, the axis that in figure, dotted line is support, side surface is hyperbola 151 in the cross section by support axis.It between the side surface of this support and top, is rounding off.Wherein, obtain the method for this support, as shown in figure 16, in hyperbola, heavy line part is rotated around rotating shaft GH the structure obtaining and is support.The value of the cross-sectional diameter of the bottom of support be greater than 0 and be less than lens place plane diameter of a circle r(as shown in Figure 4), the height of support is to be greater than the 0 cavity thickness D(that is less than module as shown in Figure 3).
It should be noted that, in Figure 16 hyp heavy line part can be hyp half, can be also hyp 1/3rd places, can also be other value, the present embodiment does not limit this.
Exemplary, if hyperbola is
this hyperbola is rotated to the structure obtaining around rotating shaft GH and is support, under backlight module cavity thickness and the immovable prerequisite of lens shape, this support is arranged on lens, the bottom of support is connected with lens exiting surface, by optical simulation software, to increasing support, do not simulate with the hot spot increasing after support, as shown in figure 17, in figure, the scale in left side is illuminance value (W/m
2) with the light and shade corresponding relation of hot spot, darkness deepens for hot spot from top to bottom, corresponding illuminance value is increasing, in figure, right side is hot spot coordinate figure, the unit of X, Y coordinate is millimeters(millimeter), in figure, central point illuminance is 3200, the hot spot of Figure 10 does not compare when increasing support, by obtaining the diameter of hot spot after optics software simulation, increase 30%, central point illumination is reduced to 3200 by the analogue value 4200.According to analog result, can learn: spot center brightness value reduces, it is large that facula area becomes, because be subject to stopping of support from the light of region, lens centre outgoing after support is set on lens, refraction, reflection through lens and bracket side surface are spread, make the brightness of hot spot zones of different carry out distribution again, the light reflection surface on bracket side surface also reflects a part of light in directive spot center region, further reduce the brightness in spot center region, thereby solved the poor problem of homogeneity of backlight.
Concrete, for the light transmission that makes to stop through frame bottom is to optical module, reflecting layer is set on backboard conventionally.As shown in figure 18, line with arrow in figure represents to propagate light, as can be seen from Figure 18, in the light of light source outgoing, the stopping of bottom that a part can be passed through from the light of region, lens centre outgoing support is reflected, be transferred on reflecting layer 35, after the reflection in reflecting layer 35 back into being mapped in lens 34, there is total reflection in the side at lens 34, finally from the upper surface of lens 34, reflect, when light is irradiated to the side surface of support 33, the reflection of process support 33 side surfaces departs from original direction, is finally irradiated on optical module 31, the light in another part directive spot center region is directly incident on the side of lens 34 and reflects from light source 33 sends, on upper surface by lens 34, reflect, when light is irradiated to the side surface of support 33, the reflection through support 33 side surfaces, is finally irradiated on optical module 31, in sum, the outgoing of the light when there is no support has larger shooting angle, because support has stopped from the light of region, lens centre outgoing, make light through reflecting layer and the refraction of lens, reflection, pass through again the reflected illumination on bracket side surface to optical module, spread the light of light source outgoing, thereby the brightness in the spot center region that the light that has reduced light source outgoing forms, the light reflection surface on bracket side surface also reflects a part of light in directive spot center region, further reduced the brightness in spot center region, solved the poor problem of homogeneity of backlight, can improve the display effect of display unit.
It should be noted that, only provided the route of transmission of several exemplary light in figure, the propagation of other light can be with reference to above-mentioned explanation, and the present embodiment will not enumerate description at this.
It should be noted that, the side surface of described support can be elliptic curve, circular curve or hyperbola in the cross section by support axis, can be also free form surface.
The embodiment of the present invention provides a kind of down straight aphototropism mode set, comprise backboard, light source, support, lens and optical module, described light source is arranged on described backboard, and described lens are arranged on described light source, described support is arranged on the exiting surface at described lens top, optical module described in the top braces of described support.Because the light that LED light source sends is lambertian distribution, light is more concentrated directly over LED light source, so the light that LED light source scioptics center is penetrated is higher than peripheral region, these light sources from the outgoing of region, lens centre are concentrated in the central area of hot spot, make the brightness in spot center region higher, in the down straight aphototropism mode set providing in technical solution of the present invention, by the support arranging on the exiting surface of lens, stopped the light from the outgoing of lens exiting surface to spot center region originally, this part light light path after a series of reflection and refraction changes and away from the central area of hot spot, thereby reduced the brightness in spot center region, and the position between lens and lens does not arrange support, the brightness of the top area of former support can be lowered, thereby improved the light homogeneity of backlight, make display unit have good display effect.
Embodiment five
Embodiments of the invention provide a kind of down straight aphototropism mode set, as shown in Figure 3, comprise backboard 30, light source 32, support 33, lens 34 and optical module 31, light source 32 is arranged on backboard 30, lens 34 are arranged on light source 32, and support 33 is arranged on the exiting surface 340 at lens top, the top 331 support of optical assemblies 31 of support.
Wherein, optical module 31 comprises blooming piece and diffuser plate from top to bottom successively, and the top 331 of support is inconsistent with support of optical assembly 31 with diffuser plate, describes in Fig. 3 and is marked for convenience.
Further, the side surface of support is light reflection surface.
Concrete, as shown in Figure 3, the side surface 332 of support is light reflection surface, so that be irradiated to the light reflection of the side surface 332 of support, the area of bottom 330 cross sections of support is greater than the area of top 331 cross sections of support.
Further, the bottom of support is light tight portion.
It should be noted that, the bottom that the bottom 330 of support can be support for light tight portion is set to reflection layer, the bottom that can be also support is set to light absorbing zone, can also be to choose opaque material to make support, so that the bottom of support is light tight, the embodiment of the present invention is not done concrete restriction to this.
In a kind of possible implementation, described support is cone.
Concrete, if support is cone, the top of this cone support is curved surface.For the light transmission that makes to stop through frame bottom is to optical module, reflecting layer is set on backboard conventionally.As shown in figure 19, propagation in the down straight aphototropism mode set that light provides at the present embodiment, line with arrow in figure represents to propagate light, as can be seen from Figure 19, in the light of light source outgoing, the stopping of bottom that a part can be passed through from the light of region, lens centre outgoing support is reflected, be transferred on reflecting layer 35, after the reflection in reflecting layer 35 back into being mapped in lens 34, there is total reflection in the side at lens 34, finally from the upper surface of lens 34, reflect, when light is irradiated to the side surface of support 33, reflection through support 33 side surfaces departs from original direction, finally be irradiated on optical module 31, the light in another part directive spot center region is directly incident on the side of lens 34 and reflects from light source 33 sends, on upper surface by lens 34, reflect, when light is irradiated to the side surface of support 33, the reflection through support 33 side surfaces, is finally irradiated on optical module 31, in sum, because support has stopped from the light of region, lens centre outgoing, make light through reflecting layer and the refraction of lens, reflection, pass through again the reflected illumination on bracket side surface to optical module, spread the light of light source outgoing, thereby the brightness in the spot center region that the light that has reduced light source outgoing forms, the light reflection surface on bracket side surface also reflects a part of light in directive spot center region, further reduced the brightness in spot center region, solved the poor problem of homogeneity of backlight, can improve the display effect of display unit.
It should be noted that, only provided the route of transmission of several exemplary light in figure, the propagation of other light can be with reference to above-mentioned explanation, and the present embodiment will not enumerate description at this.
Exemplary, if taper cone angle is 10 °, under backlight module cavity thickness and the immovable prerequisite of lens shape, this cone support is arranged on lens, the bottom of support is connected with lens exiting surface, by optical simulation software, to increasing support, do not simulate with the hot spot increasing after support, as shown in figure 20, in figure, the scale in left side is illuminance value (W/m
2) with the light and shade corresponding relation of hot spot, darkness deepens for hot spot from top to bottom, corresponding illuminance value is increasing, in figure, right side is hot spot coordinate figure, the unit of X, Y coordinate is millimeters(millimeter), in figure, central point illuminance is 1900, the hot spot of Figure 10 does not compare when increasing support, it is large that the diameter of hot spot becomes, and central point illumination has the analogue value to reduce.According to analog result, can learn: spot center brightness value reduces, it is large that facula area becomes, because be subject to stopping of support from the light of region, lens centre outgoing after support is set on lens, refraction, reflection through lens and bracket side surface are spread, make the brightness of hot spot zones of different carry out distribution again, the light reflection surface on bracket side surface also reflects a part of light in directive spot center region, further reduce the brightness in spot center region, thereby solved the poor problem of homogeneity of backlight.
The embodiment of the present invention provides a kind of down straight aphototropism mode set, comprise backboard, light source, support, lens and optical module, described light source is arranged on described backboard, and described lens are arranged on described light source, described support is arranged on the exiting surface at described lens top, optical module described in the top braces of described support.Because the light that LED light source sends is lambertian distribution, light is more concentrated directly over LED light source, so the light that LED light source scioptics center is penetrated is higher than peripheral region, these light sources from the outgoing of region, lens centre are concentrated in the central area of hot spot, make the brightness in spot center region higher, in the down straight aphototropism mode set providing in technical solution of the present invention, by the support arranging on the exiting surface of lens, stopped the light from the outgoing of lens exiting surface to spot center region originally, this part light light path after a series of reflection and refraction changes and away from the central area of hot spot, thereby reduced the brightness in spot center region, and the position between lens and lens does not arrange support, the brightness of the top area of former support can be lowered, thereby improved the light homogeneity of backlight, make display unit have good display effect.
Embodiment six
The embodiment of the present invention provides a kind of display unit, comprises liquid crystal panel and backlight module, and described liquid crystal panel is fixed on described backlight module exiting surface, and described backlight module is the down straight aphototropism mode set with above-mentioned arbitrary characteristics.
The display unit that the embodiment of the present invention provides can have the product of Presentation Function or other for liquid crystal display, LCD TV, DPF, mobile phone, panel computer etc., and the embodiment of the present invention does not limit.
The display unit providing based on the embodiment of the present invention, center by the exiting surface at lens arranges support, stopped the light from the outgoing of lens exiting surface to spot center region originally, this part light can be away from the central area of hot spot after a series of reflection and refraction, thereby reduced the brightness in spot center region, improved the light homogeneity of backlight, made display unit have good display effect.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. a down straight aphototropism mode set, comprise backboard, light source, support, lens and optical module, described light source is arranged on described backboard, described lens are arranged on described light source, it is characterized in that, described support is arranged on the exiting surface at described lens top, optical module described in the top braces of described support.
2. down straight aphototropism mode set according to claim 1, is characterized in that, the side surface of described support is light reflection surface.
3. down straight aphototropism mode set according to claim 2, is characterized in that, the bottom of described support is light tight portion.
4. down straight aphototropism mode set according to claim 3, is characterized in that, the side surface of described support is elliptic curve in the cross section by support axis.
5. down straight aphototropism mode set according to claim 3, is characterized in that, the side surface of described support is circular curve in the cross section by support axis.
6. down straight aphototropism mode set according to claim 3, is characterized in that, described support is cone.
7. down straight aphototropism mode set according to claim 3, is characterized in that, the side surface of described support is hyperbola in the cross section by support axis, between the side surface of described support and the top of described support, is rounding off.
8. according to the down straight aphototropism mode set described in claim 4-6 any one, it is characterized in that, the top of described support is curved surface.
9. down straight aphototropism mode set according to claim 2, is characterized in that, described light reflection surface is reflectance coating or reflector plate.
10. a display unit, comprises liquid crystal panel and backlight module, and described liquid crystal panel is fixed on described backlight module exiting surface, it is characterized in that, described backlight module is the down straight aphototropism mode set with the arbitrary characteristics described in claim 1-9.
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| CN103953875B (en) | 2016-05-11 |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |