CN203311132U - Backlight module and liquid crystal display device - Google Patents
Backlight module and liquid crystal display device Download PDFInfo
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- CN203311132U CN203311132U CN2013203464225U CN201320346422U CN203311132U CN 203311132 U CN203311132 U CN 203311132U CN 2013203464225 U CN2013203464225 U CN 2013203464225U CN 201320346422 U CN201320346422 U CN 201320346422U CN 203311132 U CN203311132 U CN 203311132U
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Abstract
The utility model discloses a backlight module and a liquid crystal display device and aims to effectively avoid the phenomenon of a lamp post in an existing backlight module. The backlight module at least comprises a light guide plate and light emitting diode (LED) light bars, wherein at least one light incidence surface is arranged on the light guide plate; optical devices for converting circular light beams emitted by the LED light bars into elliptical light beams and emitting the elliptical light beams into the light incidence surfaces of the light guide plate are arranged between the light incidence surfaces of the light guide plate and the LED light bars; the long semiaxis of the elliptical light beams is parallel to the arrangement direction of the LED light bars. According to the backlight module, the phenomenon of light beads caused by increasing of a distance between two adjacent groups of LED light bars is reduced or eliminated, a subjective effect and the light emergence gray scale of the backlight module are improved, and the display effect of the liquid crystal display device using the backlight module is enhanced.
Description
Technical field
The utility model relates to the back light model setting technology field, is specifically related to a kind of backlight module and applies the liquid crystal indicator of this backlight module.
Background technology
For side-light backlight module field, backlight module develops towards slimming, and the LED lamp of backlight module is also towards high brightness simultaneously, high-luminous-efficiency, powerful future development, along with this development trend of LED, therefore the more original quantity of quantity of the LED lamp in the backlight module under similarity condition will greatly reduce, and the spacing between lamp and lamp can increase simultaneously.As shown in Figure 1, because the lighting angle of LED lamp is certain, after the spacing between lamp and lamp has increased, relatively large over against the ray density of the position incidence surface of LED lamp is that luminous energy is larger, but the ray density less of the incidence surface of corresponding LED lamp both sides is that luminous energy is less, because the light inlet sidelight energy distribution of light guide plate is inhomogeneous, thereby easily cause the phenomenon that produces the light and shade inequality in the light inlet side, be commonly called as lamp pearl phenomenon.
The major measure of the lamp of tradition change at present pearl phenomenon has:
1. under the glue frame, paste seal, the method that blooming piece, light guide plate, seal and glue frame are pressed on together solves lamp pearl phenomenon.But because blooming piece is thinner, in seal process, be easy to wrinkling, manufacture craft inconvenience, and wrinkling blooming piece will be eliminated, and cause the wasting of resources.
2. in the part blacking near light source, absorb a part of light.This kind method has been wasted part luminous energy, and the luminous energy service efficiency is low.
3. when dot surface is layouted, at the light source place, do not establish or establish less site, reduce refraction and reflection to light.This kind method, due to the bad control in the gap of not layouting of light guide plate light inlet side, easily causes the phenomenon of light inlet side blanking bar.
4. when layouting, the net-pont design of light inlet side is serrate, makes light in the light inlet side, not form bright spot as far as possible.This kind method is distributed with strict demand to the sawtooth of light source and light guide plate, and being slightly offset the speck phenomenon can increase the weight of.
The method that tradition is improved lamp pearl phenomenon respectively has drawback, and the change that backlight module is carried out of above-mentioned the whole bag of tricks all can not meet backlight module to the trend of thinning future development more.
The utility model content
For the problems referred to above, the utility model provide a kind of easily manufactured, cost is low, in the situation that can effectively improve because square between between two adjacent groups LED lamp bar causes more greatly backlight module lamp pearl phenomenon, and the display device that can not introduce the backlight module of new optical problem and use this backlight module.
For achieving the above object, the utility model backlight module, at least comprise backboard, be arranged on light guide plate and LED lamp bar on described backboard, described light guide plate is provided with at least one incidence surface, between the incidence surface of described light guide plate and described LED lamp bar, be provided with the circular light beam of described LED lamp bar emission is become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the arragement direction of described LED lamp bar.
Particularly, the clearance D between the incidence surface of described optical devices and described light guide plate is by diffusion angle [alpha] and the decision of the spacing L between adjacent two optical devices of optical devices exiting surface, and namely D is not less than (L/2) * cot (α/2).
Especially, the end face that described incidence surface is corresponding is that the end face that planar structure or described incidence surface are corresponding is the V-arrangement end face structure.
Further, the angle between two of described V-arrangement end face structure end faces is more than or equal to 70 degree and is less than or equal to 110 degree.
Further, two of described V-arrangement end face structure end faces are provided with the lateral reflection blooming piece.
Preferably, the size of two of described V-arrangement end face structure end faces equates.
Further, described optical devices comprise collimating part and diffusion part, wherein said collimating part is directional light by the beam collimation that described LED lamp bar sends, and described diffusion part is diffused as by the described directional light that described collimating part sends the incidence surface that oval-shaped light beam is injected described light guide plate.
In a specific embodiment, described collimating part is lens, and wherein said lens are simple lens or poly-lens, and described diffusion part is cylindrical mirror or is biprism.
Further, on the incidence surface of described optical devices and exiting surface, all be coated with the anti-reflection film in visible spectrum zone.
For achieving the above object, the utility model liquid crystal indicator, comprise backlight module at least, and described backlight module is above-mentioned backlight module.
The utility model beneficial effect:
1, the utility model backlight module, the place ahead by the incidence surface in light guide plate arranges the optical devices that the circular light beam of LED lamp bar become to oval-shaped beam, the optical axis of the optical axis of light source and light guide plate is separated and forms from the axle optical devices, increased thus the relative ray density of incidence surface corresponding between adjacent two light sources, therefore alleviate and eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, having improved subjective effect and the bright dipping gray scale of backlight module.
2, the utility model liquid crystal indicator, by the backlight module of the backlight module using above-mentioned improvement as liquid crystal indicator, eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, improve subjective effect and the bright dipping gray scale of backlight module, and then promoted the display effect of liquid crystal indicator.
The accompanying drawing explanation
Fig. 1 is the schematic diagram that lamp pearl phenomenon produces;
Fig. 2 is that LED lamp bar is mapped to before the incidence surface of light guide plate without optical devices and has passed through the comparison diagram of the light beam that optical devices form;
Fig. 3 is the structural representation that the light guide plate front end of the embodiment 1 of the utility model backlight module increases optical devices;
Fig. 4 is the structural representation that the light guide plate front end of the embodiment 1 of the utility model backlight module increases optical devices;
Fig. 5 is the structural representation that the light guide plate front end of the embodiment 3 of the utility model backlight module increases optical devices;
Fig. 6 is the structural representation that the light guide plate front end of the embodiment 3 of the utility model backlight module increases optical devices;
Fig. 7 is the structural representation that the light guide plate front end of the embodiment 5 of the utility model backlight module increases optical devices;
Fig. 8 is the structural representation that the light guide plate front end of the embodiment 5 of the utility model backlight module increases optical devices;
Fig. 9 is the structural representation that the light guide plate front end of the embodiment 7 of the utility model backlight module increases optical devices;
Figure 10 is the structural representation that the light guide plate front end of the embodiment 7 of the utility model backlight module increases optical devices;
Figure 11 is the structural representation that the light guide plate front end of the embodiment 9 of the utility model backlight module increases optical devices;
Figure 12 is the structural representation that the light guide plate front end of the embodiment 9 of the utility model backlight module increases optical devices;
Figure 13 is the structural representation that the light guide plate front end of the embodiment 13 of the utility model backlight module increases optical devices;
Figure 14 is the structural representation that the light guide plate front end of the embodiment 13 of the utility model backlight module increases optical devices;
Figure 15 is the structural representation that the light guide plate front end of the embodiment 13 of the utility model backlight module increases optical devices;
Figure 16 is the structural representation that the light guide plate front end of the embodiment 13 of the utility model backlight module increases optical devices;
Figure 17 is the structural representation that the light guide plate front end of the embodiment 15 of the utility model backlight module increases optical devices;
Figure 18 is the structural representation that the light guide plate front end of the embodiment 15 of the utility model backlight module increases optical devices.
Embodiment
Below in conjunction with Figure of description, the utility model is further described.
The utility model backlight module, at least comprise backboard, be arranged on light guide plate and LED lamp bar on described backboard, described light guide plate is provided with at least one incidence surface, between the incidence surface of described light guide plate and described LED lamp bar, be provided with the circular light beam of described LED lamp bar emission is become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the arragement direction of described LED lamp bar.
As shown in Figure 2, LED lamp bar is mapped to before the incidence surface of light guide plate without optical devices and has passed through the comparison diagram of the light beam that optical devices form.The circular light beam 21 that LED lamp 2 shoots out, the circular light beam that optical devices send LED lamp bar becomes the oval-shaped beam 22 of flat, the major radius of adjacent two oval-shaped beams is joined mutually, oval-shaped major radius is greater than circular radius, light beam between such two adjacent light sources has had more intersection area, light that light source sends and contact area between the light guide plate incidence surface have been increased, thereby eliminated because spacing between light source increases, the phenomenon in light inlet side generation light and shade inequality caused is the lamppost phenomenon.
The utility model liquid crystal indicator, comprise backlight module at least, and described backlight module is above-mentioned backlight module.
As shown in Figs. 3-4, the present embodiment backlight module, at least comprise backboard, the LED lamp bar 2 that is arranged on the light guide plate 1 on described backboard and is arranged on incidence surface one side of institute's light guide plate, described backlight module is the side entrance back module of monolateral light inlet, the end face structure that the incidence surface of described LED lamp bar is corresponding is planar structure, front end at described light guide plate incidence surface is provided with and the circular light beam of LED lamp bar emission can be become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices 3 of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the bearing of trend of described incidence surface.In Fig. 3 to 4, only show light guide plate, LED lamp bar and optical devices.In the present embodiment, the specification of light guide plate is 600*440mm, needs 10 groups of LED lamp bars, and every group of LED lamp bar is over against answering one group of optical devices, and the spacing between the two adjacent groups optical devices is 40mm, and the diffusion angle of optical devices is 48 degree.Diffusion angle [alpha] and the spacing L between adjacent two optical devices by the optical devices exiting surface determines due to the clearance D between the incidence surface of described optical devices and described light guide plate, be that D is not less than (L/2) * cot (α/2), the gap between the incidence surface of optical devices and light guide plate should be not less than 45mm, and in the present embodiment, the gap of the incidence surface of optical devices and light guide plate such as tabula rasa is 50mm.
The present embodiment backlight module, the place ahead by the incidence surface in light guide plate arranges the optical devices that the circular light beam of LED lamp bar become to oval-shaped beam, the optical axis of the optical axis of light source and light guide plate is separated and forms from the axle optical devices, increased thus the relative ray density of incidence surface corresponding between adjacent two light sources, therefore alleviate and eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, having improved subjective effect and the bright dipping gray scale of backlight module.
The present embodiment liquid crystal indicator, comprise backlight module at least, and described backlight module is the backlight module described in above-described embodiment 1.The present embodiment is by the backlight module using the backlight module of above-mentioned improvement as liquid crystal indicator, eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, improve subjective effect and the bright dipping gray scale of backlight module, and then promoted the display effect of liquid crystal indicator.
As shown in Fig. 5 to 6, the present embodiment backlight module, at least comprise backboard, the LED lamp bar 2 that is arranged on the light guide plate 1 on described backboard and is arranged on incidence surface one side of institute's light guide plate, described backlight module is the side entrance back module of monolateral light inlet, the end face structure that the incidence surface of described LED lamp bar is corresponding is the V-arrangement end face structure, front end at described light guide plate incidence surface is provided with and the circular light beam of LED lamp bar emission can be become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices 3 of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the bearing of trend of described incidence surface.In Fig. 5 to 6, only show light guide plate, LED lamp bar and optical devices.In the present embodiment, the specification of light guide plate is 600*440mm, need 8 groups of LED lamp bars, every group of LED lamp bar is over against answering one group of optical devices, spacing between the two adjacent groups optical devices is 63mm, the diffusion angle of optical devices is 60 degree, the gap between the incidence surface of optical devices and light guide plate should be not less than 36mm, and in the present embodiment, the gap of the incidence surface of optical devices and light guide plate such as tabula rasa is 55mm.
The present embodiment backlight module, the place ahead by the incidence surface in light guide plate arranges the optical devices that the circular light beam of LED lamp bar become to oval-shaped beam, the optical axis of the optical axis of light source and light guide plate is separated and forms from the axle optical devices, increased thus the relative ray density of incidence surface corresponding between adjacent two light sources, therefore alleviate and eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, having improved subjective effect and the bright dipping gray scale of backlight module.Simultaneously, the present embodiment changes for the V-arrangement end face structure compared to end face structure corresponding to the incidence surface of the light guide plate described in embodiment 1, angle 70 degree of two end faces of V-arrangement end face, the V-type end face makes the light generation light path counter-rotating of incident, optical devices just can be placed on a side of the dot surface of light guide plate incidence surface thus, optical devices do not need to take light guide plate broadside space length in addition, the structure of the light guide plate described in the present embodiment can better adapt to the development of the super narrow trend of backlight module, when improving lamp pearl phenomenon, can not increase the width of light guide plate.
Embodiment 4
The present embodiment liquid crystal indicator, comprise backlight module at least, and described backlight module is the backlight module described in above-described embodiment 3.The present embodiment is by the backlight module using the backlight module of above-mentioned improvement as liquid crystal indicator, eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, improve subjective effect and the bright dipping gray scale of backlight module, and then promoted the display effect of liquid crystal indicator.
Embodiment 5
As shown in Fig. 7 to 8, the present embodiment backlight module, at least comprise backboard, the LED lamp bar 2 that is arranged on the light guide plate 1 on described backboard and is arranged on the both sides incidence surface front end of described light guide plate, described backlight module is the side entrance back module of bilateral light inlet, wherein, the end face of the incidence surface of described LED lamp bar is planar structure, front end at described light guide plate incidence surface is provided with and the circular light beam of LED lamp bar emission can be become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the bearing of trend of described incidence surface.In Fig. 7 to 8, only show light guide plate, LED lamp bar and optical devices 3.In the present embodiment, the specification of light guide plate is 720*460mm, each side all needs 15 groups of LED lamp bars, every group of LED lamp bar is over against answering one group of optical devices, every group of optical devices include collimating part and diffusion part, the beam collimation that wherein said collimating part sends described LED lamp bar is the simple lens 31 of directional light, the described directional light that described diffusion part sends described collimating part is diffused as the cylindrical mirror 33 that oval-shaped light beam is injected the incidence surface of described light guide plate, and optical devices corresponding to both sides are identical.Diffusion angle [alpha] and the spacing L between adjacent two optical devices by the optical devices exiting surface determines due to the clearance D between the incidence surface of described optical devices and described light guide plate, be that D is not less than (L/2) * cot (α/2), the spacing between the two adjacent groups optical devices is 33mm, the diffusion angle of cylindrical mirror is 50 degree, the gap between the incidence surface of cylindrical mirror and light guide plate should be not less than 13.8mm, but the gap between cylindrical mirror and light guide plate incidence surface should be less than 360mm in the present embodiment, in the present embodiment, the gap of the incidence surface of optical devices and light guide plate such as tabula rasa is 20mm.
The present embodiment backlight module, the place ahead by the incidence surface in light guide plate arranges the optical devices that the circular light beam of LED lamp bar become to oval-shaped beam, the optical axis of the optical axis of light source and light guide plate is separated and forms from the axle optical devices, increased thus the relative ray density of incidence surface corresponding between adjacent two light sources, therefore alleviate and eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, having improved subjective effect and the bright dipping gray scale of backlight module.The light beam of LED lamp bar first passes through simple lens, the beam collimation that described simple lens sends LED lamp bar is directional light, then described directional light is elongated as thin flat ellipse through cylindrical mirror, wherein simple lens is the waste that directional light is avoided luminous energy on the one hand by beam collimation, uniform light density on the other hand, for light, from cylindrical mirror, spreading out and prepare, make can be transmitted into uniformly from the light that the exiting surface of cylindrical mirror sends the incidence surface of light guide plate.
Embodiment 6
The present embodiment liquid crystal indicator, comprise backlight module at least, and described backlight module is the backlight module described in above-described embodiment 5.The present embodiment is by the backlight module using the backlight module of above-mentioned improvement as liquid crystal indicator, eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, improve subjective effect and the bright dipping gray scale of backlight module, and then promoted the display effect of liquid crystal indicator.
Embodiment 7
As shown in Fig. 9 to 10, the present embodiment backlight module, at least comprise backboard, the LED lamp bar 2 that is arranged on the light guide plate 1 on described backboard and is arranged on the incidence surface front end of described light guide plate both sides, described backlight module is the side entrance back module of bilateral light inlet, wherein, the end face that the incidence surface of described LED lamp bar is corresponding is V-structure, and the angle of described V-type face is 80 degree.Front end at described light guide plate incidence surface is provided with and the circular light beam of LED lamp bar emission can be become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the bearing of trend of described incidence surface.In Fig. 9 to 10, only show light guide plate, LED lamp bar and optical devices.In the present embodiment, the specification of light guide plate is 720*460mm, each side all needs 13 groups of LED lamp bars, every group of LED lamp bar is over against answering one group of optical devices, every group of optical devices include collimating part and diffusion part, the beam collimation that wherein said collimating part sends described LED lamp bar is the poly-lens 32 of directional light, the described directional light that described diffusion part sends described collimating part is diffused as the biprism 34 that oval-shaped light beam is injected the incidence surface of described light guide plate, and optical devices corresponding to both sides are identical.Spacing between the two adjacent groups optical devices is 38mm, the diffusion angle of biprism is 30 degree, the gap between the incidence surface of biprism and light guide plate should be not less than 27mm, but the gap between biprism and light guide plate incidence surface should be less than 360mm in the present embodiment, in the present embodiment, the gap of the incidence surface of optical devices and light guide plate such as tabula rasa is 80mm.
The present embodiment backlight module, the place ahead by the incidence surface in light guide plate arranges the optical devices that the circular light beam of LED lamp bar become to oval-shaped beam, the optical axis of the optical axis of light source and light guide plate is separated and forms from the axle optical devices, increased thus the relative ray density of incidence surface corresponding between adjacent two light sources, therefore alleviate and eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, having improved subjective effect and the bright dipping gray scale of backlight module.The light beam of LED lamp bar first passes through poly-lens, the beam collimation that described poly-lens sends LED lamp bar is directional light, then described directional light is elongated as thin flat ellipse through biprism, wherein poly-lens is the waste that directional light is avoided luminous energy on the one hand by beam collimation, uniform light density on the other hand, for light, from biprism, spreading out and prepare, make can be transmitted into uniformly from the light that the exiting surface of biprism sends the incidence surface of light guide plate.Simultaneously, the present embodiment changes incidence surface for the V-type face compared to the structure of the incidence surface of the light guide plate described in embodiment 5, the angle of V-type face is 80 degree, the V-type face makes the light generation light path counter-rotating of incident, optical devices just can be placed on a side of the dot surface of light guide plate incidence surface thus, optical devices do not need to take light guide plate broadside space length in addition, the structure of the light guide plate described in the present embodiment can better adapt to the development of the super narrow trend of backlight module, can not increase the width of light guide plate when improving lamp pearl phenomenon.
Embodiment 8
The present embodiment liquid crystal indicator, comprise backlight module at least, and described backlight module is the backlight module described in above-described embodiment 7.The present embodiment is by the backlight module using the backlight module of above-mentioned improvement as liquid crystal indicator, eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, improve subjective effect and the bright dipping gray scale of backlight module, and then promoted the display effect of liquid crystal indicator.
Embodiment 9
As shown in Figure 11 to 12, the present embodiment backlight module, at least comprise backboard, the many groups backlight LED lamp bar 2 that is arranged on the light guide plate 1 on described backboard and is arranged on incidence surface one side of institute's light guide plate, described backlight module is the side entrance back module of monolateral light inlet, the end face structure that the incidence surface of described backlight LED lamp bar is corresponding is planar structure, front end at described light guide plate incidence surface, be provided with and the circular light beam of backlight LED lamp bar emission can be become to the optical devices of oval-shaped beam, front end at described light guide plate incidence surface is provided with and the circular light beam of backlight LED lamp bar emission can be become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the bearing of trend of described incidence surface.In Figure 11 to 12, only show light guide plate, backlight LED lamp bar and optical devices.In the present embodiment, the specification of light guide plate is 936mm*534mm, need 15 groups of backlight LED lamp bars, every group of backlight LED lamp bar is over against answering one group of optical devices, every group of optical devices include collimating part and diffusion part, wherein said collimating part is the poly-lens of directional light by the beam collimation that described backlight LED lamp bar sends, described diffusion part is diffused as by the described directional light that described collimating part sends the cylindrical mirror that oval-shaped light beam is injected the incidence surface of described light guide plate, on the poly-lens 32 of described optical devices and the incidence surface of cylindrical mirror 33 and exiting surface, all be coated with the anti-reflection film in visible spectrum zone.Diffusion angle [alpha] and the spacing L between adjacent two optical devices by the optical devices exiting surface determines due to the clearance D between the incidence surface of described optical devices and described light guide plate, be that D is not less than (L/2) * cot (α/2), the spacing between the two adjacent groups optical devices is 34mm, the diffusion angle of cylindrical mirror is 60 degree, the gap between the incidence surface of cylindrical mirror and light guide plate should be not less than 22mm, but the gap between cylindrical mirror and light guide plate incidence surface should be less than 468mm in the present embodiment, in the present embodiment, the gap of the incidence surface of optical devices and light guide plate such as tabula rasa is 468mm.
The present embodiment backlight module, the place ahead by the incidence surface in light guide plate arranges the optical devices that the circular light beam of LED lamp bar become to oval-shaped beam, the optical axis of the optical axis of light source and light guide plate is separated and forms from the axle optical devices, increased thus the relative ray density of incidence surface corresponding between adjacent two light sources, therefore alleviate and eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, having improved subjective effect and the bright dipping gray scale of backlight module.The light beam of LED lamp bar first passes through poly-lens, the beam collimation that described poly-lens sends LED lamp bar is directional light, then described directional light is elongated as thin flat ellipse through cylindrical mirror, wherein poly-lens is the waste that directional light is avoided luminous energy on the one hand by beam collimation, uniform light density on the other hand, for light, from cylindrical mirror, spreading out and prepare, make can be transmitted into uniformly from the light that the exiting surface of cylindrical mirror sends the incidence surface of light guide plate.Anti-reflection film incidence surface and the exiting surface of poly-lens and cylindrical mirror plates visible region, can reduce reflection ray, improved light utilization efficiency, and then promoted the backlight module display effect.
Embodiment 10
The present embodiment liquid crystal indicator, comprise backlight module at least, and described backlight module is the backlight module described in above-described embodiment 9.The present embodiment is by the backlight module using the backlight module of above-mentioned improvement as liquid crystal indicator, eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, improve subjective effect and the bright dipping gray scale of backlight module, and then promoted the display effect of liquid crystal indicator.
Embodiment 11
As shown in Figure 13 to 14, the present embodiment backlight module, at least comprise backboard, the many groups LED lamp bar 2 that is arranged on the light guide plate 1 on described backboard and is arranged on incidence surface one side of institute's light guide plate, described backlight module is the side entrance back module of monolateral light inlet, wherein, the incidence surface of described LED lamp bar is V-structure, the angle of described V-type face is 90 degree, front end at described light guide plate incidence surface is provided with and the circular light beam of LED lamp bar emission can be become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the bearing of trend of described incidence surface.In Figure 13 to 14, only show light guide plate, LED lamp bar and optical devices.In the present embodiment, the specification of light guide plate is 800*660mm, each side all needs 11 groups of LED lamp bars, every group of LED lamp bar is over against answering one group of optical devices, every group of optical devices include collimating part and diffusion part, the beam collimation that wherein said collimating part sends described LED lamp bar is the poly-lens 32 of directional light, the described directional light that described diffusion part sends described collimating part is diffused as the cylindrical mirror 33 that oval-shaped light beam is injected the incidence surface of described light guide plate, on the poly-lens of described optical devices and the incidence surface of cylindrical mirror and exiting surface, all be coated with the anti-reflection film in visible spectrum zone.Diffusion angle [alpha] and the spacing L between adjacent two optical devices by the optical devices exiting surface determines due to the clearance D between the incidence surface of described optical devices and described light guide plate, be that D is not less than (L/2) * cot (α/2), the spacing between the two adjacent groups optical devices is 46mm, the diffusion angle of cylindrical mirror is 70 degree, the gap between the incidence surface of cylindrical mirror and light guide plate should be not less than 33mm, but the gap between cylindrical mirror and light guide plate incidence surface should be less than 300mm in the present embodiment, in the present embodiment, the gap of the incidence surface of optical devices and light guide plate such as tabula rasa is 80mm.
The present embodiment backlight module, the place ahead by the incidence surface in light guide plate arranges the optical devices that the circular light beam of LED lamp bar become to oval-shaped beam, the optical axis of the optical axis of light source and light guide plate is separated and forms from the axle optical devices, increased thus the relative ray density of incidence surface corresponding between adjacent two light sources, therefore alleviate and eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, having improved subjective effect and the bright dipping gray scale of backlight module.The light beam of LED lamp bar first passes through poly-lens, the beam collimation that described poly-lens sends LED lamp bar is directional light, then described directional light is elongated as thin flat ellipse through cylindrical mirror, wherein poly-lens is the waste that directional light is avoided luminous energy on the one hand by beam collimation, uniform light density on the other hand, for light from cylindrical mirror, spreading out and prepare, make can be transmitted into uniformly from the light that the exiting surface of cylindrical mirror sends the incidence surface of light guide plate, the anti-reflection film that plates visible region at incidence surface and the exiting surface of poly-lens and cylindrical mirror, can reduce reflection ray, improved light utilization efficiency, and then promoted the backlight module display effect.Simultaneously, the present embodiment changes incidence surface for the V-type face compared to the structure of the incidence surface of the light guide plate described in embodiment 9, the angle of V-type face is 80 degree, the V-type face makes the light generation light path counter-rotating of incident, the size of two end faces of v-shaped structure equates, make light energy distribution even, optical devices just can be placed on a side of the dot surface of light guide plate incidence surface thus, optical devices do not need to take light guide plate broadside space length in addition, the structure of the light guide plate described in the present embodiment can better adapt to the development of the super narrow trend of backlight module, when improving lamp pearl phenomenon, can not increase the width of light guide plate.
Embodiment 12
The present embodiment liquid crystal indicator, comprise backlight module at least, and described backlight module is the backlight module described in above-described embodiment 11.The present embodiment is by the backlight module using the backlight module of above-mentioned improvement as liquid crystal indicator, eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, improve subjective effect and the bright dipping gray scale of backlight module, and then promoted the display effect of liquid crystal indicator.
Embodiment 13
As shown in Figure 15 to 16, the present embodiment backlight module, at least comprise backboard, the many groups LED lamp bar 2 that is arranged on the light guide plate 1 on described backboard and is arranged on the both sides incidence surface front end of described light guide plate, described backlight module is the side entrance back module of bilateral light inlet, wherein, the end face of the incidence surface of described LED lamp bar is planar structure, front end at described light guide plate incidence surface is provided with and the circular light beam of LED lamp bar emission can be become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the bearing of trend of described incidence surface.In Figure 15 to 16, only show light guide plate, LED lamp bar and optical devices 3.In the present embodiment, the specification of light guide plate is 1020*880mm, needs 11 groups of LED lamp bars, and every group of LED lamp bar is over against answering one group of optical devices.Every group of optical devices include collimating part and diffusion part, wherein said collimating part is directional light by the beam collimation that described LED lamp bar sends, described diffusion part is diffused as by the described directional light that described collimating part sends the incidence surface that oval-shaped light beam is injected described light guide plate, the collimating part of one side is simple lens 31, and diffusion part is biprism 34; The collimating part of opposite side is poly-lens 32, and diffusion part is cylindrical mirror 33.On the simple lens of described optical devices and the incidence surface of biprism and exiting surface, all be coated with the anti-reflection film in visible spectrum zone.Diffusion angle [alpha] and the spacing L between adjacent two optical devices by the optical devices exiting surface determines due to the clearance D between the incidence surface of described optical devices and described light guide plate, be that D is not less than (L/2) * cot (α/2), in the present embodiment, the spacing between the two adjacent groups optical devices is 88mm, the diffusion angle of biprism is 48 degree, the gap between the incidence surface of biprism and light guide plate should be not less than 60mm, the diffusion angle of cylindrical mirror is 60 degree, the gap between cylindrical mirror and light guide plate incidence surface should be not less than 46mm, but the gap between the optical devices of both sides and light guide plate incidence surface should be less than 510mm in the present embodiment, in the present embodiment, diffusion part is that the gap of the incidence surface of the optical devices of biprism one side and light guide plate such as tabula rasa is 60mm, diffusion part is that the gap of the incidence surface of the optical devices of cylindrical mirror one side and light guide plate such as tabula rasa is 80mm.
The present embodiment backlight module, the place ahead by the incidence surface in light guide plate arranges the optical devices that the circular light beam of LED lamp bar become to oval-shaped beam, the optical axis of the optical axis of light source and light guide plate is separated and forms from the axle optical devices, increased thus the relative ray density of incidence surface corresponding between adjacent two light sources, therefore alleviate and eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, having improved subjective effect and the bright dipping gray scale of backlight module.The light beam of LED lamp bar first passes through simple lens or the poly-lens of collimating part, the beam collimation that described simple lens or poly-lens send LED lamp bar is directional light, then described directional light is elongated as thin flat ellipse through biprism or cylindrical mirror, wherein simple lens or poly-lens are the waste that directional light is avoided luminous energy on the one hand by beam collimation, uniform light density on the other hand, for light, from biprism or cylindrical mirror, spreading out and prepare, make can be transmitted into uniformly from the light that the exiting surface of biprism sends the incidence surface of light guide plate.Anti-reflection film incidence surface and the exiting surface of simple lens and biprism plates visible region, can reduce reflection ray, improved light utilization efficiency, and then promoted the backlight module display effect.The optical devices that arrange at both sides incidence surface front end in the present embodiment simultaneously, be comprised of different optical elements.
Embodiment 14
The present embodiment liquid crystal indicator, comprise backlight module at least, and described backlight module is the backlight module described in above-described embodiment 13.The present embodiment is by the backlight module using the backlight module of above-mentioned improvement as liquid crystal indicator, eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, improve subjective effect and the bright dipping gray scale of backlight module, and then promoted the display effect of liquid crystal indicator.
Embodiment 15
As shown in Figure 17 to 18, the present embodiment backlight module, at least comprise backboard, the LED lamp bar 2 that is arranged on the light guide plate 1 on described backboard and is arranged on described backboard both sides, described backlight module is the side entrance back module of bilateral light inlet, wherein, the incidence surface of described LED lamp bar is V-structure, the angle of described V-type face is 110 degree, two face sizes of described V-type end face equate, on described V-type face, post the lateral reflection diaphragm, front end at described light guide plate incidence surface is provided with and the circular light beam of LED lamp bar emission can be become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices 3 of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the bearing of trend of described incidence surface.In Figure 17 to 18, only show light guide plate, LED lamp bar and optical devices.In the present embodiment, the specification of light guide plate is 1020*880mm, needs 11 groups of LED lamp bars, and every group of LED lamp bar is over against answering one group of optical devices.Every group of optical devices include collimating part and diffusion part, wherein said collimating part is directional light by the beam collimation that described LED lamp bar sends, described diffusion part is diffused as by the described directional light that described collimating part sends the incidence surface that oval-shaped light beam is injected described light guide plate, the collimating part of one side is simple lens 31, and diffusion part is biprism 34; The collimating part of opposite side is poly-lens 32, and diffusion part is cylindrical mirror 33.On the simple lens of described optical devices and the incidence surface of biprism and exiting surface, all be coated with the anti-reflection film in visible spectrum zone.Diffusion angle [alpha] and the spacing L between adjacent two optical devices by the optical devices exiting surface determines due to the clearance D between the incidence surface of described optical devices and described light guide plate, be that D is not less than (L/2) * cot (α/2), in the present embodiment, the spacing between the two adjacent groups optical devices is 88mm, the diffusion angle of biprism is 48 degree, the gap between the incidence surface of biprism and light guide plate should be not less than 60mm, the diffusion angle of cylindrical mirror is 60 degree, the gap between cylindrical mirror and light guide plate incidence surface should be not less than 46mm, but the gap between the optical devices of both sides and light guide plate incidence surface should be less than 510mm in the present embodiment, in the present embodiment, diffusion part is that the gap of the incidence surface of the optical devices of biprism one side and light guide plate such as tabula rasa is 70mm, diffusion part is that the gap of the incidence surface of the optical devices of cylindrical mirror one side and light guide plate such as tabula rasa is 60mm.
The present embodiment backlight module, the place ahead by the incidence surface in light guide plate arranges the optical devices that the circular light beam of LED lamp bar become to oval-shaped beam, the optical axis of the optical axis of light source and light guide plate is separated and forms from the axle optical devices, increased thus the relative ray density of incidence surface corresponding between adjacent two light sources, therefore alleviate and eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, having improved subjective effect and the bright dipping gray scale of backlight module.
The light beam of LED lamp bar first passes through simple lens or the poly-lens of collimating part, the beam collimation that described simple lens or poly-lens send LED lamp bar is directional light, then described directional light is elongated as thin flat ellipse through biprism or cylindrical mirror, wherein simple lens or poly-lens are the waste that directional light is avoided luminous energy on the one hand by beam collimation, uniform light density on the other hand, for light, from biprism or cylindrical mirror, spreading out and prepare, make can be transmitted into uniformly from the light that the exiting surface of biprism sends the incidence surface of light guide plate.Anti-reflection film incidence surface and the exiting surface of simple lens and biprism plates visible region, can reduce reflection ray, improved light utilization efficiency, and then promoted the backlight module display effect.Simultaneously, the present embodiment changes incidence surface for the V-type face compared to the structure of the incidence surface of the light guide plate described in embodiment 13, the angle of V-type face is 110 degree, the V-type face makes the light generation light path counter-rotating of incident, the size of two end faces of v-shaped structure equates, make light energy distribution even, the reflection diaphragm pasted on two V-type incidence surfaces can better make light reverse, and increases the service efficiency of incident light.Optical devices just can be placed on a side of the dot surface of light guide plate incidence surface thus, optical devices do not need to take light guide plate broadside space length in addition, the structure of the light guide plate described in the present embodiment can better adapt to the development of the super narrow trend of backlight module, can not increase the width of light guide plate when improving lamp pearl phenomenon.
Embodiment 16
The present embodiment liquid crystal indicator, comprise backlight module at least, and described backlight module is the backlight module described in above-described embodiment 15.The present embodiment is by the backlight module using the backlight module of above-mentioned improvement as liquid crystal indicator, eliminated because two adjacent groups LED lamp stripe pitch increases the lamp pearl phenomenon caused, improve subjective effect and the bright dipping gray scale of backlight module, and then promoted the display effect of liquid crystal indicator.
Above; it is only preferred embodiment of the present utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement, within all should being encompassed in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain that claim was defined.
Claims (10)
1. backlight module, at least comprise backboard, be arranged on light guide plate and LED lamp bar on described backboard, described light guide plate is provided with at least one incidence surface, it is characterized in that: between the incidence surface of described light guide plate and described LED lamp bar, be provided with the circular light beam of described LED lamp bar emission is become to oval-shaped beam, and described oval-shaped beam is transmitted into to the optical devices of the incidence surface of described light guide plate, the major semi-axis of wherein said oval-shaped beam parallels with the arragement direction of described LED lamp bar.
2. backlight module according to claim 1, it is characterized in that: the clearance D between the incidence surface of described optical devices and described light guide plate is by diffusion angle [alpha] and the decision of the spacing L between adjacent two optical devices of optical devices exiting surface, and namely D is not less than (L/2) * cot (α/2).
3. backlight module according to claim 1, it is characterized in that: the end face that described incidence surface is corresponding is that the end face that planar structure or described incidence surface are corresponding is the V-arrangement end face structure.
4. backlight module according to claim 3 is characterized in that: the angle between two end faces of described V-arrangement end face structure is more than or equal to 70 degree and is less than or equal to 110 degree.
5. backlight module according to claim 3, it is characterized in that: two end faces of described V-arrangement end face structure are provided with the lateral reflection blooming piece.
6. according to claim 3,4 or 5 described backlight modules, it is characterized in that: the size of two end faces of described V-arrangement end face structure equates.
7. backlight module according to claim 1, it is characterized in that: described optical devices comprise collimating part and diffusion part, wherein said collimating part is directional light by the beam collimation that described LED lamp bar sends, and described diffusion part is diffused as by the described directional light that described collimating part sends the incidence surface that oval-shaped light beam is injected described light guide plate.
8. backlight module according to claim 7, it is characterized in that: described collimating part is lens, and wherein said lens are simple lens or poly-lens, and described diffusion part is cylindrical mirror or is biprism.
9. backlight module according to claim 1, is characterized in that: the anti-reflection film that all is coated with the visible spectrum zone on the incidence surface of described optical devices and exiting surface.
10. a liquid crystal indicator, comprise backlight module at least, it is characterized in that: described backlight module is arbitrary described backlight module in claim 1 to 9.
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|---|---|---|---|
| CN2013203464225U CN203311132U (en) | 2013-06-17 | 2013-06-17 | Backlight module and liquid crystal display device |
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| CN2013203464225U CN203311132U (en) | 2013-06-17 | 2013-06-17 | Backlight module and liquid crystal display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799565A (en) * | 2019-01-28 | 2019-05-24 | 凤阳硅谷智能有限公司 | A kind of glass light guide plate and backlight module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799565A (en) * | 2019-01-28 | 2019-05-24 | 凤阳硅谷智能有限公司 | A kind of glass light guide plate and backlight module |
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