CN103900031A - Light guide device for liquid crystal display - Google Patents
Light guide device for liquid crystal display Download PDFInfo
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- CN103900031A CN103900031A CN201210579594.7A CN201210579594A CN103900031A CN 103900031 A CN103900031 A CN 103900031A CN 201210579594 A CN201210579594 A CN 201210579594A CN 103900031 A CN103900031 A CN 103900031A
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- wedge shape
- conduction board
- guiding device
- light conduction
- shape light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0028—Light guide, e.g. taper
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a light guide device for a liquid crystal display. The light guide device comprises a cuboid light guide plate and a wedge-shaped light guide plate. The cuboid light guide plate is provided with an incident surface, a bottom surface and an emergent surface, the bottom surface of the cuboid light guide plate is adjacent to the incident surface of the cuboid light guide plate, and the emergent surface of the cuboid light guide plate is opposite to the bottom surface of the cuboid light guide plate; the wedge-shaped light guide plate is provided with an incident surface, a bottom surface, an emergent surface and an inclined surface, the bottom surface of the wedge-shaped light guide plate is adjacent to the incident surface of the wedge-shaped light guide plate, the emergent surface of the wedge-shaped light guide plate is parallel to the incident surface of the wedge-shaped light guide plate, and the inclined surface of the wedge-shaped light guide plate is opposite to the bottom surface of the wedge-shaped light guide plate; the incident surface of the cuboid light guide plate coincides with the emergent surface of the wedge-shaped light guide plate, the bottom surface of the cuboid light guide plate and the bottom surface of the wedge-shaped light guide plate are located on the same plane, and the inclined surface of the wedge-shaped light guide plate is gradually inclined from the incident surface of the wedge-shaped light guide plate towards the emergent surface of the wedge-shaped light guide plate to form a protruded cylindrical surface. The light guide device has the advantages that the inclined surface of the wedge-shaped light guide plate is protruded, and accordingly light leakage of the wedge-shaped light guide plate can be reduced.
Description
Technical field
The present invention relates to technical field of liquid crystal display, especially relate to a kind of guiding device for liquid crystal display.
Background technology
Existing liquid crystal indicator comprises display panels and backlight module conventionally, display panels is made up of thin film transistor base plate, colored filter substrate and the liquid crystal layer that is disposed between these two substrates, and backlight module is to be used to provide the required light source of this display panels.
Guiding device (Light Guide Plate, referred to as LGP) is an important assembly in backlight module, Main Function be the light that sends of guiding light source by a plane outgoing, improve the uniformity of glorious degrees and the luminosity of display panels simultaneously.In existing small-medium size liquid crystal indicator, wedge shape guiding device can be realized the lightening design of backlight modular structure.Fig. 1 is the front view of existing wedge shape guiding device 100.As shown in Figure 1, can incide wedge shape guiding device 100 exiting surface 101 outgoing by wedge shape guiding device 100 from the light of LED light source 102.But the light that incides the tapered plane 103 of wedge shape guiding device 100 exists from tapered plane 103 and reflects away and cause the problem of wedge shape guiding device 100 light leaks.For example, incide the tapered plane 103 of wedge shape guiding device 100 from light A, B, the C of LED light source 102, when wherein light A, B march to tapered plane 103, because being less than light, its incident angle reflects away from tapered plane 103 in the angle of total reflection of the tapered plane 103 of wedge shape guiding device 100, thereby cause wedge shape guiding device 100 light leaks, cause the bright dipping regional luminance of backlight module to reduce, finally affected the display performance of display panels.
Summary of the invention
The object of the invention is to propose a kind of improved guiding device for liquid crystal display, can make described guiding device there is less light leak rate and higher light emission rate.
For achieving the above object, the present invention is achieved through the following technical solutions:
For a guiding device for liquid crystal display, comprising:
Cuboid LGP, described cuboid LGP has incidence surface, the basal surface adjacent with described incidence surface and the exiting surface being oppositely arranged with described basal surface;
Wedge shape light conduction board, described Wedge shape light conduction board has incidence surface, the basal surface adjacent with described incidence surface, the exiting surface arranging abreast with described incidence surface and the inclined surface being oppositely arranged with described basal surface;
Wherein, the incidence surface of described cuboid LGP overlaps with the exiting surface of described Wedge shape light conduction board, the basal surface of described cuboid LGP and the basal surface of described Wedge shape light conduction board are coplanar, and the inclined surface of described Wedge shape light conduction board is formed slopely the face of cylinder of evagination gradually to the exiting surface of described Wedge shape light conduction board from the incidence surface of described Wedge shape light conduction board.
Further, described cuboid LGP and described Wedge shape light conduction board are made up of polymethyl methacrylate (PMMA).
Further, the inclined surface of described Wedge shape light conduction board has the vertical section of circular shape, and the ratio of the distance between the radius of curvature of described circular arc and the incidence surface of described Wedge shape light conduction board and the exiting surface of described Wedge shape light conduction board is in 2.125 to 6.875 scope.
Further, the ratio of the distance between the radius of curvature of described circular arc and the incidence surface of described Wedge shape light conduction board and the exiting surface of described Wedge shape light conduction board is 3.375.
Further, described guiding device also comprises the reflecting plate being arranged under the basal surface of described cuboid LGP and the basal surface of described Wedge shape light conduction board.
Further, described guiding device also comprises the diffuser plate on the exiting surface that is arranged at cuboid LGP.
Further, described guiding device also comprises the brightness enhancement film being arranged on described diffuser plate.
Further, described cuboid LGP and described Wedge shape light conduction board integrated molding.
Correspondingly, the invention allows for another guiding device for liquid crystal display, described guiding device comprises:
Cuboid LGP, described cuboid LGP has incidence surface, the basal surface adjacent with described incidence surface and the exiting surface being oppositely arranged with described basal surface;
Wedge shape light conduction board, described Wedge shape light conduction board has incidence surface, the basal surface adjacent with described incidence surface, the exiting surface arranging abreast with described incidence surface and the inclined surface being oppositely arranged with described basal surface;
Wherein, the incidence surface of described cuboid LGP overlaps with the exiting surface of described Wedge shape light conduction board, the basal surface of described cuboid LGP and the basal surface of described Wedge shape light conduction board are coplanar, the inclined surface of described Wedge shape light conduction board is formed slopely the inclined surface of evagination gradually to the exiting surface of described Wedge shape light conduction board from the incidence surface of described Wedge shape light conduction board, described inclined surface has the vertical section of V-arrangement.
Further, the angle between two of the vertical section of described V-arrangement limits is greater than 120 degree.
Further, described cuboid LGP and described Wedge shape light conduction board are made up of polymethyl methacrylate (PMMA).
Further, described guiding device also comprises the reflecting plate being arranged under the basal surface of described cuboid LGP and the basal surface of described Wedge shape light conduction board.
Further, described guiding device also comprises the diffuser plate on the exiting surface that is arranged at cuboid LGP.
Further, described guiding device also comprises the brightness enhancement film being arranged on described diffuser plate.
Further, described cuboid LGP and described Wedge shape light conduction board integrated molding.
Correspondingly, the invention allows for a kind of liquid crystal display, described liquid crystal display has the guiding device as described in above scheme.
The guiding device that the present invention proposes, by the inclined plane of Wedge shape light conduction board is become to the inclined surface of evagination from the tapered plane of prior art, make the incidence angle of the light of the inclined surface that marches to described Wedge shape light conduction board be greater than light and produce total reflection in the angle of total reflection of described inclined surface, so not only reduce the light leak of described Wedge shape light conduction board, can also improve the utilization rate of light at described guiding device, the required brightness in the positive visual angle of described guiding device is improved.
Accompanying drawing explanation
Fig. 1 is the front view of existing wedge shape guiding device;
Fig. 2 is according to the three-dimensional view of the guiding device for liquid crystal display of first embodiment of the invention;
Fig. 3 is according to the front view of the guiding device for liquid crystal display of first embodiment of the invention;
Fig. 4 is that light is at the comparison schematic diagram with the refraction on the tapered plane of prior art guiding device according to the refraction on the inclined surface of the guiding device of first embodiment of the invention;
Fig. 5 is the front view of four kinds of guiding devices;
Fig. 6 is light leak and the bright dipping comparative analysis figure of four kinds of guiding devices of Fig. 5 of emulation acquisition;
Fig. 7 is the light leak of four kinds of guiding devices and the graph of relation of bright dipping of Fig. 5 of emulation acquisition;
Fig. 8 is the schematic diagram of advancing of light in two kinds of different guiding devices;
Fig. 9 is according to the three-dimensional view of the guiding device for liquid crystal display of second embodiment of the invention;
Figure 10 is according to the front view of the guiding device for liquid crystal display of second embodiment of the invention;
Figure 11 is according to the front view of the guiding device for liquid crystal display of third embodiment of the invention.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, in accompanying drawing, only show part related to the present invention but not entire infrastructure.
The first embodiment of the present invention has been shown in Fig. 2-4.
Fig. 2 is according to the three-dimensional view of the guiding device 200 for liquid crystal display of first embodiment of the invention; Fig. 3 is according to the front view of the guiding device 200 for liquid crystal display of first embodiment of the invention.As shown in Figure 3, the guiding device 200 described in the present embodiment comprises: cuboid LGP 220 and Wedge shape light conduction board 210.Described cuboid LGP 220 has incidence surface 224, the basal surface 223 adjacent with described incidence surface 224 and the exiting surface 221 being oppositely arranged with described basal surface 223.And described Wedge shape light conduction board 210 has incidence surface 212, the basal surface 213 adjacent with described incidence surface 212, the exiting surface 214 arranging abreast with described incidence surface 212 and the inclined surface 211 being oppositely arranged with described basal surface 213.Wherein, the incidence surface 224 of described cuboid LGP 220 overlaps with the exiting surface 214 of described Wedge shape light conduction board 210, the basal surface 223 of described cuboid LGP 220 is coplanar with the basal surface 213 of described Wedge shape light conduction board 210, and the inclined surface 211 of described Wedge shape light conduction board 210 is formed slopely the face of cylinder of evagination gradually to the exiting surface 214 of described Wedge shape light conduction board 210 from the incidence surface 212 of described Wedge shape light conduction board 210.
In the first embodiment, described cuboid LGP 220 and described Wedge shape light conduction board 210 are made up of polymethyl methacrylate (PMMA).As the preferred mode of one, can integrated molding described in cuboid LGP 220 and described Wedge shape light conduction board 210.
In a preferred embodiment of the present embodiment, described Wedge shape light conduction board 210 can also comprise a level connection joint portion 240, and this level connection joint portion 240 extends to light source 230 from incidence surface 212, the basal surface 213 of described Wedge shape light conduction board 210.By means of this level connection joint portion 240, the light that is derived from light source 230 is directed in described guiding device 200 better, thereby contributes to be increased in the luminous flux in guiding device 200.
In the first embodiment, by the inclined surface of described Wedge shape light conduction board 210 211 is become to the face of cylinder of the evagination with radian from the wedge shape tapered plane of prior art, make the incidence angle of the light of the inclined surface 211 that marches to described Wedge shape light conduction board 210 be greater than light and produce total reflection in the angle of total reflection of described inclined surface 211, so not only can reduce the light leak of described Wedge shape light conduction board 210, can also improve the utilization rate of light at described guiding device 200, the required brightness in positive visual angle of described guiding device 200 is improved.
Fig. 4 is light according to the comparison schematic diagram of the refraction on the refraction on the inclined surface 211 of the guiding device 200 of first embodiment of the invention and tapered plane 261 at prior art guiding device.On the basis of Fig. 2-3, further referring to Fig. 4, described Wedge shape light conduction board 210 is made up of polymethyl methacrylate (PMMA) material, and the medium refraction index of this PMMA material is 1.4935, and the angle of total reflection is 43.352 °.In Fig. 4, in the time that the light a of the inclined plane of directive Wedge shape light conduction board 210 upside arrives the tapered plane 261 of prior art guiding device, the normal angle of light a and tapered plane 261 is 42 ° (being less than the angle of total reflection), thereby light a will cause light leak through tapered plane 261.And in the time that the light a of the inclined plane of directive Wedge shape light conduction board 210 upside arrives the inclined surface 211 according to first embodiment of the invention, with the angle of the normal of inclined surface (curved surface) 211 be 48 ° (being greater than the angle of total reflection), therefore light a will be totally reflected go back to Wedge shape light conduction board 210 inside, can not cause light leak.
Continue referring to Fig. 4, in the time that the light b of the inclined plane of directive Wedge shape light conduction board 210 downside arrives the tapered plane 261 of prior art guiding device, with the normal angle of plane be 66 °, be greater than the angle of total reflection, therefore light b will be totally reflected go back to Wedge shape light conduction board 210 inside; And in the time that light b arrives according to the inclined surface 211 of first embodiment of the invention, with the angle of the normal of inclined surface (curved surface) 211 be 60 °, be still greater than the angle of total reflection, therefore light b also will be totally reflected go back to Wedge shape light conduction board 210 inside.That is to say, although the angle that the normal of the light b of the inclined plane downside of directive Wedge shape light conduction board 210 and inclined surface (curved surface) 211 forms is less with the angle that tapered plane 261 forms than light b, but because these two angles are all greater than the angle of total reflection, so light b can be reflected back toward Wedge shape light conduction board 210 inside, thereby can not cause the light leak of Wedge shape light conduction board 210.
Fig. 5-Fig. 8 be for existing guiding device with adopting under the prerequisite of identical manufactured materials according to the guiding device of first embodiment of the invention, emulation obtains the comparison diagram of every optical parametric.At this, adopt simulation softward (for example Tracepro simulation softward) to carry out emulation to the optical characteristics of four kinds of guiding device LGP1-LGP4.
Fig. 5 shows the front view of four kinds of guiding device LGP1-LGP4, wherein, and the guiding device that LGP1 is prior art; And LGP2-LGP4 is the guiding device according to first embodiment of the invention, difference is only the radius of curvature difference of inclined surface (curved surface).As shown in Figure 5, the radius of curvature R of the inclined surface (curved surface) of guiding device LGP2 is 5.5mm, the radius of curvature R of the inclined surface (curved surface) of guiding device LGP3 is 2.7mm, and the radius of curvature R of the inclined surface of guiding device LGP4 (curved surface) is 1.7mm.Four kinds of guiding devices of this shown in Fig. 5 are to be all made up of PMMA material, its medium refraction index is 1.4935, the angle of total reflection is 43.352 °, and the distance between incidence surface and the exiting surface of the Wedge shape light conduction board of these four kinds of guiding devices is all that the long measure in 0.8mm(Fig. 5 is mm).
Fig. 6 is light leak and the bright dipping comparative analysis figure of four kinds of guiding device LGP1-LGP4 of emulation acquisition.Known according to the contrast of the every optical data in Fig. 6, there is more light leak in the region of Wedge shape light conduction board in guiding device LGP1, and guiding device LGP2-LGP4 is relatively less at the light leak in the region of Wedge shape light conduction board, embody good guiding device optical characteristics.Especially, the region light leak amount minimum of the Wedge shape light conduction board of guiding device LGP3, effectively amount of light maximum, is most suitable Wedge shape light conduction board design in these four kinds of guiding devices.
Fig. 7 is the light leak of four kinds of guiding device LGP1-LGP4 and the graph of relation of bright dipping that emulation obtains.Wherein, transverse axis represents this four kinds of guiding device LGP1-LGP4, and the longitudinal axis represents the light leak amount in the Wedge shape light conduction board region of guiding device, and unit is watt (W).Known according to two curve comparisons in Fig. 7, the inclined plane of Wedge shape light conduction board becomes curved surface from tapered plane, can effectively reduce the light leak amount in Wedge shape light conduction board region, increases the effective amount of light of visible area of guiding device.For example, according to the guiding device LGP2-LGP4 of first embodiment of the invention compared with existing guiding device LGP1, reduce to some extent the light leak amount in Wedge shape light conduction board region, especially guiding device LGP3, aspect light leak amount and effective two parameters of bright dipping, embody larger data edge, demonstrated effective enhancing of the optical property to guiding device.
Further can find out from the emulated data shown in Fig. 6 and Fig. 7, not be the bigger the better according to the curvature of the inclined surface of the guiding device of first embodiment of the invention (curved surface), exist an optimum curvature to make the light leakage effect minimum in Wedge shape light conduction board region.For example, the curvature of the ratio of curvature guiding device LGP3 of the inclined surface of guiding device LGP4 (curved surface) is larger, but the light leak problem in the Wedge shape light conduction board region of guiding device LGP4 is more serious.The reason of above-mentioned light leak problem can be with further reference to the explanation to Fig. 8, and Fig. 8 shows the schematic diagram of advancing of light in guiding device LGP3 and guiding device LGP4.As can be seen from Figure 8, same light a can penetrate Wedge shape light conduction board region and cause light leak in guiding device LGP4, thereby can be totally reflected back in Wedge shape light conduction board and be re-used in guiding device LGP3.So, in practice, can radius of curvature R of initial setting, make light a and surface normal angle be slightly larger than the angle of total reflection, then slight modification radius of curvature R or other parameter do simulation relatively, can find out very soon the scheme of optimal curvatures radius R.
To sum up, compared with existing guiding device LGP1, not only effectively reduce the light leak amount in Wedge shape light conduction board region according to the guiding device LGP2-LGP4 of first embodiment of the invention, can also strengthen to some extent the optical property of guiding device.
Fig. 9-10 show the second embodiment of the present invention.
Fig. 9 is according to the three-dimensional view of the guiding device 900 for liquid crystal display of second embodiment of the invention; Figure 10 is according to the front view of the guiding device 900 for liquid crystal display of second embodiment of the invention.As shown in figure 10, the guiding device 900 described in the present embodiment comprises: cuboid LGP 920 and Wedge shape light conduction board 910.Described cuboid LGP 920 has incidence surface 924, the basal surface 923 adjacent with described incidence surface 924 and the exiting surface 921 being oppositely arranged with described basal surface 923.And described Wedge shape light conduction board 910 has incidence surface 912, the basal surface 913 adjacent with described incidence surface 912, the exiting surface 914 arranging abreast with described incidence surface 912 and the inclined surface 911 being oppositely arranged with described basal surface 913.Wherein, the incidence surface 924 of described cuboid LGP 920 overlaps with the exiting surface 914 of described Wedge shape light conduction board 910, the basal surface 923 of described cuboid LGP 920 is coplanar with the basal surface 913 of described Wedge shape light conduction board 910, the inclined surface 911 of described Wedge shape light conduction board 910 is formed slopely the inclined surface of evagination gradually to the exiting surface 914 of described Wedge shape light conduction board 910 from the incidence surface 912 of described Wedge shape light conduction board 910, described inclined surface 911 has the vertical section of V-arrangement.
In a second embodiment, described cuboid LGP 920 and described Wedge shape light conduction board 910 are made up of polymethyl methacrylate (PMMA).As the preferred mode of one, can integrated molding described in cuboid LGP 920 and described Wedge shape light conduction board 910.
In a preferred embodiment of the present embodiment, described Wedge shape light conduction board 910 can also comprise a level connection joint portion 940, and this level connection joint portion 940 is extended to light source 930 by incidence surface 912, the basal surface 913 of described Wedge shape light conduction board 910.By means of this level connection joint portion 940, the light that is derived from light source 930 is directed in described guiding device 900 better, thereby has further increased the luminous flux in guiding device 900.
As can be seen from Figure 10, different from the first embodiment, described inclined surface 911 is not in a second embodiment the face of cylinder of evagination but has the vertical section of V-arrangement.Preferably, the angle β between two of the vertical section of described V-arrangement limits is greater than 120 degree.
In a second embodiment, by the inclined surface of described Wedge shape light conduction board 910 911 is become to the inclined surface of the evagination of the vertical section with V-arrangement from the tapered plane of prior art, make the incidence angle of the light of the inclined surface 911 that marches to described Wedge shape light conduction board 910 be greater than light and produce total reflection in the angle of total reflection of described inclined surface 911, so not only can reduce the light leak of described Wedge shape light conduction board 910, can also improve the utilization rate of light at described guiding device 900, the required brightness in positive visual angle of described guiding device 900 is improved.
Figure 11 shows the third embodiment of the present invention.
Figure 11 is according to the front view of the guiding device 1100 for liquid crystal display of third embodiment of the invention.As shown in figure 11, the guiding device 1100 described in the present embodiment comprises: cuboid LGP 1120 and Wedge shape light conduction board 1110.Described cuboid LGP 1120 has incidence surface 1124, the basal surface 1123 adjacent with described incidence surface 1124 and the exiting surface 1121 being oppositely arranged with described basal surface 1123.And described Wedge shape light conduction board 1110 has incidence surface 1112, the basal surface 1113 adjacent with described incidence surface 1112, the exiting surface 1114 arranging abreast with described incidence surface 1112 and the inclined surface 1111 being oppositely arranged with described basal surface 1113.Wherein, the incidence surface 1124 of described cuboid LGP 1120 overlaps with the exiting surface 1114 of described Wedge shape light conduction board 1110, the basal surface 1123 of described cuboid LGP 1120 is coplanar with the basal surface 1113 of described Wedge shape light conduction board 1110, and the inclined surface 1111 of described Wedge shape light conduction board 1110 is formed slopely the face of cylinder of evagination gradually to the exiting surface 1114 of described Wedge shape light conduction board 1110 from the incidence surface 1112 of described Wedge shape light conduction board 1110.
In the 3rd embodiment, cuboid LGP 1120, Wedge shape light conduction board 1110 in above-mentioned guiding device 1100 are identical with the corresponding light conducting plate structure in the first embodiment, do not repeat them here.
As can be seen from Figure 11, different from the first embodiment, the guiding device 1100 in the 3rd embodiment also comprises: be arranged at the reflecting plate 1160 under the basal surface 1123 of described cuboid LGP 1120 and the basal surface 1113 of described Wedge shape light conduction board 1110; And be arranged at the diffuser plate 1180 on the exiting surface 1121 of cuboid LGP 1120.As the preferred mode of one, described guiding device 1100 also comprises the brightness enhancement film 1190 being arranged on described diffuser plate 1180.
By above-mentioned guiding device 1100 is increased to reflecting plate 1160, diffuser plate 1180 and brightness enhancement film 1190, can further optimize the optical property of described guiding device 1100.
In addition, the invention allows for a kind of liquid crystal display, described liquid crystal display has the guiding device as described in one of above first, second, third embodiment.
The guiding device that the present invention proposes, by the inclined plane of Wedge shape light conduction board is become to the inclined surface of evagination from the tapered plane of prior art, make the incidence angle of the light of the inclined surface that marches to described Wedge shape light conduction board be greater than light and produce total reflection in the angle of total reflection of described inclined surface, so not only reduce the light leak of described Wedge shape light conduction board, can also improve the utilization rate of light at described guiding device, the required brightness in the positive visual angle of described guiding device is improved.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection scope of the present invention.Therefore, although the present invention is described in further detail by above embodiment, the present invention is not limited only to above embodiment, in the situation that not departing from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.
Claims (16)
1. for a guiding device for liquid crystal display, comprising:
Cuboid LGP, described cuboid LGP has incidence surface, the basal surface adjacent with described incidence surface and the exiting surface being oppositely arranged with described basal surface;
Wedge shape light conduction board, described Wedge shape light conduction board has incidence surface, the basal surface adjacent with described incidence surface, the exiting surface arranging abreast with described incidence surface and the inclined surface being oppositely arranged with described basal surface;
Wherein, the incidence surface of described cuboid LGP overlaps with the exiting surface of described Wedge shape light conduction board, the basal surface of described cuboid LGP and the basal surface of described Wedge shape light conduction board are coplanar, and the inclined surface of described Wedge shape light conduction board is formed slopely the face of cylinder of evagination gradually to the exiting surface of described Wedge shape light conduction board from the incidence surface of described Wedge shape light conduction board.
2. the guiding device for liquid crystal display according to claim 1, is characterized in that, described cuboid LGP and described Wedge shape light conduction board are made up of polymethyl methacrylate (PMMA).
3. the guiding device for liquid crystal display according to claim 2, it is characterized in that, the inclined surface of described Wedge shape light conduction board has the vertical section of circular shape, and the ratio of the distance between the radius of curvature of described circular arc and the incidence surface of described Wedge shape light conduction board and the exiting surface of described Wedge shape light conduction board is in 2.125 to 6.875 scope.
4. the guiding device for liquid crystal display according to claim 3, is characterized in that, the ratio of the distance between the radius of curvature of described circular arc and the incidence surface of described Wedge shape light conduction board and the exiting surface of described Wedge shape light conduction board is 3.375.
5. according to the guiding device for liquid crystal display described in claim 1-4, it is characterized in that, described guiding device also comprises the reflecting plate being arranged under the basal surface of described cuboid LGP and the basal surface of described Wedge shape light conduction board.
6. according to the guiding device for liquid crystal display described in claim 1-4, it is characterized in that, described guiding device also comprises the diffuser plate on the exiting surface that is arranged at cuboid LGP.
7. the guiding device for liquid crystal display according to claim 6, is characterized in that, described guiding device also comprises the brightness enhancement film being arranged on described diffuser plate.
8. want the guiding device for liquid crystal display described in 1-4 according to right, it is characterized in that described cuboid LGP and described Wedge shape light conduction board integrated molding.
9. for a guiding device for liquid crystal display, comprising:
Cuboid LGP, described cuboid LGP has incidence surface, the basal surface adjacent with described incidence surface and the exiting surface being oppositely arranged with described basal surface;
Wedge shape light conduction board, described Wedge shape light conduction board has incidence surface, the basal surface adjacent with described incidence surface, the exiting surface arranging abreast with described incidence surface and the inclined surface being oppositely arranged with described basal surface;
Wherein, the incidence surface of described cuboid LGP overlaps with the exiting surface of described Wedge shape light conduction board, the basal surface of described cuboid LGP and the basal surface of described Wedge shape light conduction board are coplanar, the inclined surface of described Wedge shape light conduction board is formed slopely the inclined surface of evagination gradually to the exiting surface of described Wedge shape light conduction board from the incidence surface of described Wedge shape light conduction board, described inclined surface has the vertical section of V-arrangement.
10. want the guiding device for liquid crystal display described in 9 according to right, it is characterized in that, the angle between two limits of the vertical section of described V-arrangement is greater than 120 degree.
11. according to the guiding device for liquid crystal display described in claim 9-10, it is characterized in that, described cuboid LGP and described Wedge shape light conduction board are made up of polymethyl methacrylate (PMMA).
12. guiding devices for liquid crystal display according to claim 9, is characterized in that, described guiding device also comprises the reflecting plate being arranged under the basal surface of described cuboid LGP and the basal surface of described Wedge shape light conduction board.
13. guiding devices for liquid crystal display according to claim 9, is characterized in that, described guiding device also comprises the diffuser plate on the exiting surface that is arranged at cuboid LGP.
14. guiding devices for liquid crystal display according to claim 13, is characterized in that, described guiding device also comprises the brightness enhancement film being arranged on described diffuser plate.
15. want the guiding device for liquid crystal display described in 1-4 according to right, it is characterized in that described cuboid LGP and described Wedge shape light conduction board integrated molding.
16. 1 kinds of liquid crystal displays, have the guiding device as described in one of above claim 1-15.
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| CN201510930661.9A CN105511008B (en) | 2012-12-27 | 2012-12-27 | A kind of guiding device for liquid crystal display |
| CN201210579594.7A CN103900031B (en) | 2012-12-27 | 2012-12-27 | A kind of guiding device for liquid crystal display |
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| CN201210579594.7A CN103900031B (en) | 2012-12-27 | 2012-12-27 | A kind of guiding device for liquid crystal display |
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| CN103900031B CN103900031B (en) | 2016-05-11 |
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| TWI574064B (en) * | 2015-08-14 | 2017-03-11 | Light guiding film, backlight module, and display device | |
| CN115542611A (en) * | 2022-11-25 | 2022-12-30 | 惠科股份有限公司 | Backlight module and display device |
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| CN107703581A (en) * | 2017-09-30 | 2018-02-16 | 长沙市宇顺显示技术有限公司 | A kind of light guide plate and backlight module |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105511008A (en) | 2016-04-20 |
| CN103900031B (en) | 2016-05-11 |
| CN105511008B (en) | 2018-12-18 |
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