CN101251674A - Backlight device and transmission type display apparatus - Google Patents
Backlight device and transmission type display apparatus Download PDFInfo
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- CN101251674A CN101251674A CNA200810009648XA CN200810009648A CN101251674A CN 101251674 A CN101251674 A CN 101251674A CN A200810009648X A CNA200810009648X A CN A200810009648XA CN 200810009648 A CN200810009648 A CN 200810009648A CN 101251674 A CN101251674 A CN 101251674A
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Abstract
The invention provides a backlight device capable of irradiating in a front direction and in a left-right direction and a penetrating display device. A first light source (2) is disposed at an end side of a first light guiding plate (1), and a first prism sheet (3) is disposed at a light outgoing side of the first light guiding plate (1) with a manner that the surface opposite to the first light guiding plate (1) is provided as a triangular prism row. A second light source (4) is disposed at the side of the first light guiding plate (1) opposite to the first prism sheet (3) separated by a vision field angle adjusting membrane. Light emitting by the second light source (4) is controlled by the vision field membrane (5), so that angle of light emitting from the second light source (4) distributes narrowly, and directionality is provided in a normal direction on an exit surface of the first prism sheet (3).
Description
Technical field
The present invention relates at back lighting device that does well on the illumination characteristic and the transmission display unit that on display characteristic, does well.
Background technology
The display device that openly has following configuration, promptly on 2 different light inlet end faces of light guide plate, dispose light source respectively, exiting surface side configuration in above-mentioned light guide plate has the two sides rib type lens that the triangle prism is listed as and cylinder lenses is listed as, and has disposed transluscent display panel in the exiting surface side of above-mentioned prismatic lens.In this display device, with respectively with the corresponding angle of horizontal parallax from the light of above-mentioned transluscent display panel outgoing from above-mentioned light source, and make it be synchronized with above-mentioned light source and make parallax as Alternation Display on transluscent display panel, can carry out stereo display (for example with reference to patent documentation 1) thus.
In addition, following liquid crystal indicator is disclosed also, the display panels that this liquid crystal indicator has used the image formation layer that comprises liquid crystal layer and disparity barrier layer to be provided with across hyaline layer.In this liquid crystal indicator, image formation layer and the distance adjustment between the disparity barrier layer are become to be suitable for the distance of double image demonstration by above-mentioned hyaline layer, the image that image that formed left side observer uses on above-mentioned image formation layer and right side observer use is by means of the transmitted light by disparity barrier, guided the observer who gives left side and right side respectively, thereby the double image that can show different separately images shows (for example with reference to patent documentation 2).
[patent documentation 1] international No. 04/027492 pamphlet (the 1st page) that disclose
[patent documentation 2] Jap.P. Publication Laid-Open 2005-258016 communique (the 1st page)
Though in the display device shown in the patent documentation 1, as long as synchronously repeat 2 different images and rewrite in liquid crystal panel with the switching of lighting of light source on 2 the different light inlet end faces that are configured in light guide plate respectively, just can make in the normal direction with display surface is that the center is watched different images respectively to the user who watches between 15 degree to the left with to the user who watches between 15 degree to the right, but have when main users one people faces display panel two images such problem that mixes on frontal.
In addition, the display panels of patent documentation 2, be provided with disparity barrier, so that the image that image that the observer uses on the left of showing on the pixel cambium layer and right side observer use, light from this each image outgoing is guided the observer who gives left side and right side respectively, so just have angles of display to tilt, be difficult to use such problem when facing display panel.In addition, exist because image formation layer is divided into observer's usefulness on left side and right side, thus the image of half pixel count become, and also therefore the part because of disparity barrier blocks transmitted light shows the problem that deepening is such.
Summary of the invention
The present invention finishes in order to address the above problem, and its purpose is to obtain a kind of back lighting device that can shine on frontal and left and right directions.
In addition, its purpose is to obtain a kind of transmission display unit that can show bright image on frontal and left and right directions.
Back lighting device involved in the present invention possesses: first prismatic lens has triangle prism row on a face; First light source, the light that has directivity on the direction that will tilt in the exit facet normal direction with respect to the side opposite with above-mentioned triangle prism row of this first prismatic lens incides the triangle prism row of above-mentioned first prismatic lens; And secondary light source, the light that will have directivity on the normal direction of the exit facet of above-mentioned first prismatic lens incides the triangle prism row of above-mentioned first prismatic lens.
The light that has directivity on the direction that the normal direction with respect to the exit facet of first prismatic lens tilts incides the triangle prism row of first prismatic lens, reflects on the inclined-plane of the triangle prism row of above-mentioned first prismatic lens and shines frontal.In addition, the light that has directivity on the normal direction of the exit facet of above-mentioned prismatic lens incides the triangle prism row of first prismatic lens, on above-mentioned prismatic lens, reflect, and from prismatic lens direction outgoing to the left and right.By above processing, can on frontal and left and right directions, shine.
Description of drawings
Fig. 1 is the stereographic map of the back lighting device of embodiment of the present invention 1.
Fig. 2 is the key diagram of expression from the optical transmission light path of the light source among Fig. 1.
Fig. 3 is that the expression embodiment of the present invention is 1 that relate to, the figure of the transmitted light path in first prismatic lens.
Fig. 4 is in the expression embodiment of the present invention 1, from the performance plot towards the angular distribution of the incident light of first prismatic lens and emergent light of the light of first light source.
Fig. 5 is in the expression embodiment of the present invention 1, from the performance plot towards the angular distribution of the incident light of first prismatic lens and emergent light of the light of secondary light source.
Fig. 6 is the key diagram of irradiating state of the back lighting device of embodiment of the present invention 1.
Fig. 7 is the performance plot of angular distribution of irradiates light of the back lighting device of expression embodiment of the present invention 2.
Fig. 8 is the performance plot of angular distribution of irradiates light of the back lighting device of expression embodiment of the present invention 2.
Fig. 9 is the performance plot of angular distribution of irradiates light of the back lighting device of expression embodiment of the present invention 2.
Figure 10 is the performance plot of angular distribution of irradiates light of the back lighting device of expression embodiment of the present invention 2.
Figure 11 is in the back lighting device of expression embodiment of the present invention 3, from the performance plot of the angular distribution of the emergent light of secondary light source.
Figure 12 is in the back lighting device of expression embodiment of the present invention 3, from the performance plot of the angular distribution of the emergent light of secondary light source.
Figure 13 is in the back lighting device of expression embodiment of the present invention 3, from the performance plot of the angular distribution of the emergent light of secondary light source.
Figure 14 is in the back lighting device of expression embodiment of the present invention 3, from the performance plot of the angular distribution of the emergent light of secondary light source.
Figure 15 is in the back lighting device of expression embodiment of the present invention 3, from the performance plot of the angular distribution of the emergent light of secondary light source.
Figure 16 is in the back lighting device of expression embodiment of the present invention 3, from the performance plot of the angular distribution of the emergent light of secondary light source.
Figure 17 is the pie graph of the back lighting device of embodiment of the present invention 4.
Figure 18 is the back lighting device of embodiment of the present invention 5 and the stereographic map that has used its transmission display unit.
Figure 19 is the figure of the transmissive state of the transmitted light path of the back lighting device of expression among Figure 18 and transmission-type panel.
Figure 20 is the synoptic diagram of the state of orientation of the liquid crystal molecule in the optics that relates to of expression embodiment of the present invention 5.
Figure 21 is the synoptic diagram of the state of orientation of the liquid crystal material in the optics that relates to of other back lighting device of expression embodiment of the present invention 5.
Figure 22 is the sectional view of other first light guide plate of embodiment of the present invention 5.
Figure 23 is the back lighting device of embodiment of the present invention 6 and the pie graph that has used its transmission display unit.
Figure 24 is the pie graph of the transmission display unit of embodiment of the present invention 7.
Figure 25 is the pie graph of the transmission display unit of embodiment of the present invention 8.
Figure 26 is the key diagram that utilizes the display image that the transmission display unit of embodiment of the present invention 8 forms.
Embodiment
Fig. 1 is the stereographic map of the back lighting device of embodiment of the present invention 1.Fig. 2 be expression from the optical transmission light path key diagram of the light source among Fig. 1, used sectional view perpendicular to the face of the crest line direction of the triangle prism row of prismatic lens.
On two end face sides of difference of first light guide plate 1, dispose first light source 2 respectively, on the taking-up side (exiting side) of the light of first light guide plate 1, first prismatic lens 3 is set, on a side opposite of first light guide plate 1, adjust film 5 configuration secondary light sources 4 across field angle with first prismatic lens 3.In addition, light source control portion 6 is set also, carries out brightness regulation or flicker switching from the light of first light source 2 and secondary light source 4.
As the first related light source 2 of present embodiment, use LED or electric light usually, incide the end face of first light guide plate 1 from the light of the first light source outgoing.In addition,, except that LED and electric light, also use the area source of electroluminescence etc., incide the interarea of first light guide plate 1 from the light of secondary light source outgoing as the related secondary light source 4 of present embodiment.
In addition, though first light source 2 and secondary light source 4 are configured at least one and get final product, but it is such shown in present embodiment, when two the different end face sides that first light source 2 are configured in first light guide plate 1 respectively, or when disposing a plurality of the 2nd light source 4, can realize the brightness uniformity in the shady face and the luminous intensity distribution angular distribution of irradiation symmetrically.
The 1st light guide plate 1 that present embodiment is related, the rectangular shape in its side and be tabular on the whole, the one side at least in top and bottom forms concavo-convex prism or the gauffer of being made up of the degree inclined-plane, obtuse angle of the low dip below 5 degree in order to take out light.Incide from first light source first light guide plate 1 end face light on one side repeatedly total reflection advance on one side, a part run into light take out usefulness gauffer male and fomale(M﹠F) and from 1 outgoing of first light guide plate.
In addition, make the incident end face almost parallel from the light of first light source 2 of the crest line direction of triangle prism row of the first related prismatic lens 3 of present embodiment and first light guide plate 1.By making it parallel, can make from the light of first prismatic lens, 3 outgoing and easily in 3 of first prismatic lenses, become even.
Adjust film 5 as the related field angle of present embodiment, the light control film that for example uses Sumitomo 3M (ス リ one エ system) (strain) to make, make from the angular distribution of the light of secondary light source 4 outgoing narrow, with the controlling party tropism.In the present embodiment, adjust film 5 by field angle and absorb the light that leaks into the below from the 1st light guide plate, thereby can prevent to become parasitic light.The light of missing on left and right directions when first light source 2 is lighted by the minimizing parasitic light can tail off.
In addition, the first related prismatic lens 3 of present embodiment for example forms with the material of refractive index 1.5, be configured on the triangle prism that the direction of the end face that is parallel to first light guide plate 1 is extended is listed in direction with the paper quadrature, extend, and be arranged to the face side relative with first light guide plate 1 is listed as the triangle prism at crest line on the face.Incide above-mentioned triangle prism row from the light of first, second light source, and from face, i.e. exit facet 30 outgoing of first prismatic lens 3 of the side opposite with first light guide plate 1 of first prismatic lens 3.
Fig. 3 is the figure from the optical transmission light path of first, second light source in expression, first prismatic lens 3 relevant with the back lighting device of present embodiment, and the drift angle that is triangle prism row is the examples that wait film triangle formation of 60 degree.
As shown in Figure 3, from the light of first light source 2 from first light guide plate 1 as the light that on the direction that tilts with respect to the normal direction of the exit facet 30 of first prismatic lens 3 (below, abbreviate normal direction as), has directivity and outgoing.This has the inclined-plane 3b incident of the light a1 of directivity from the triangle prism row of first prismatic lens 3 on the direction that tilts with respect to normal direction, and the inclined-plane 3a that is listed as at the triangle prism reflects, exit facet 30 from first prismatic lens 3, as the light a2 that on normal direction, has directivity and frontal is shone in outgoing thus.In addition, adjust film 5 from the light of secondary light source 4 by field angle and come the controlling party tropism, become the light b1 that on normal direction, has directivity, this has the inclined-plane 3a incident of the light b1 of directivity from the triangle prism row of first prismatic lens 3 on normal direction, when the inclined-plane 3a that incides triangle prism row, reflect, from the exit facet 30 of first prismatic lens 3, left and right directions is shone in outgoing thus as have the light b2 of directivity on the direction that tilts with respect to normal direction.
In addition, in first prismatic lens 3, when the inclined-plane 3a that incides triangle prism row, reflect and have the β angle with respect to normal direction from the light b2 of secondary light source.Half angle at the drift angle of the triangle prism of first prismatic lens 3 row is under the situation of α, if establish β≤α, then above-mentioned smooth b2 can outgoing on left and right directions, and can not reflect on the inclined-plane 3b relative with inclined-plane 3a of triangle prism row.
Fig. 4 is that expression will be as shown in Figure 2 from 2 outgoing of first light source and via first light guide plate 1, the angular distribution of emergent light a2 when inciding the angular distribution of first prismatic lens, 3 incident light a1 and incident light a1 from 3 outgoing of first prismatic lens, the performance plot of the simulation result when having carried out emulation based on the ray trajectory tracing of Monte Carlo method.Among the figure, transverse axis is the angle with respect to normal direction, on the paper of Fig. 2, with respect to the left side of normal direction for negative, right side for just, the longitudinal axis is that light intensity is represented with arbitrary unit.
Fig. 4 (a) is from 2 outgoing of first light source, incides the angular distribution of the incident light a1 of first prismatic lens 3, among the figure, angular distribution shown in the solid line is the angular distribution by the incident light of first light source, 2 generations in the left side of paper in Fig. 2, angular distribution shown in the dotted line is that phase is mirror each other by the angular distribution of first light source, 2 generations on right side.That is to say, from about the light of first light source, 2 outgoing as having the light of angular distribution and incide first prismatic lens 3 from first light guide plate at 60 degree～80 degree at the light a1 that-80 degree～-60 degree have an angular distribution with respect to normal direction.
Fig. 4 (b) is the angular distribution of the emergent light a2 of incident light a1 during from 3 outgoing of first prismatic lens that incide first prismatic lens 3, and expression has angular distribution with respect to normal direction on-20 degree～20 degree, and on normal direction optically focused.
Fig. 5 be expression will be as shown in Figure 2 from secondary light source 4 outgoing and incide the angular distribution of incident light b1 of first prismatic lens 3 and the angular distribution of the emergent light b2 of incident light b1 during from 3 outgoing of first prismatic lens, the performance plot of the simulation result when having carried out emulation based on the ray trajectory tracing of Monte Carlo method.Among the figure, transverse axis is the angle with respect to normal direction, on the paper of Fig. 2, with respect to the left side of normal direction for negative, right side for just, the longitudinal axis is a light intensity, represents with arbitrary unit.
Fig. 5 (a) is from secondary light source 4 outgoing and incides the angular distribution of incident light b1 of the triangle prism row of first prismatic lens 3, for example adjust film 5 and make it narrow on-35 degree～35 degree, having angular distribution with respect to normal direction by field angle, and on normal direction the controlling party tropism.Fig. 5 (b) is the angular distribution of the emergent light b2 of incident light b1 during from 3 outgoing of the 1st prismatic lens that incide first prismatic lens 3, expression is not outgoing on normal direction, but with respect to normal direction at-30 degree following and 30 modes that have angular distribution more than spending on left and right directions, separately carry out outgoing.
Fig. 6 is the key diagram of irradiating state of the back lighting device of present embodiment.Emergent light from back lighting device 10, to the outgoing of observer's side, if establish the left eye 8a of observer when being in right opposite and the about 65mm of distance of right eye 8b, to the about 300mm of observer's line-of-sight distance, the normal direction 9 of then above-mentioned exit facet 30 and the straight line angulation 9a that links left eye 8a or right eye 8b are about 6 degree from the exit facet 30 of first prismatic lens 3.In addition, an eye is under the situation of right opposite in observer's the left and right sides, and the another eye is on the direction of-12 degree and 12 degree.
According to above narration, frontal in this instructions be meant with the normal direction on the above-mentioned exit facet 30 be the center about 12 degree, promptly comprise angular regions with respect to the angular ranges of normal direction-12 degree～+ 12 degree, the angular range that will depart from above-mentioned frontal is defined as left and right directions.
Thereby, as described above, in the present embodiment, because the light of the angular distribution shown in Fig. 4 (a) is converged in the mode that has angular distribution with respect to normal direction on-20 degree～20 degree by first prismatic lens 3, so can fully comprise the angular range (with respect to the scopes of normal direction-12 degree～+ 12 degree) of the emergent light that the observer can discern at frontal, by first light source, 2 irradiation frontals.
In addition, since the light of the angular distribution shown in Fig. 5 (a) by first prismatic lens 3 so that following and 30 modes that have angular distribution more than spending are being able to bending at-30 degree with respect to normal direction, so can depart from the angular range (with respect to the scopes of normal direction-12 degree～+ 12 degree) of the emergent light that the observer can discern at frontal, by secondary light source 4 irradiation left and right directions.
The drift angle that uses triangular prism to be listed as is respectively first prismatic lens 3 of 70 degree, 65 degree, 60 degree or 55 degree, as the incident light b1 that incides first prismatic lens 3 from secondary light source 4, use at the light that have directivity on the normal direction and on-35 degree～35 degree, having the light of angular distribution, promptly have the wide angular distribution of 70 degree as the center, similarly carried out the emulation of light from first, second light source angular distribution of each emergent light during outgoing on above-mentioned each first prismatic lens 3 with embodiment 1 with normal direction with respect to normal direction.
Fig. 7～Figure 10 is under the situation of first prismatic lens 3 that has used the triangular prism row with above-mentioned different drift angles separately, on above-mentioned each first prismatic lens 3 simulation result of the angular distribution of each emergent light b2 of outgoing, be the angular distribution of irradiates light of the back lighting device of present embodiment.In addition, in each figure, (a) being the simulation result that light from first light source 2 incides the angular distribution of the emergent light a2 of outgoing after first prismatic lens 3, (b) is the simulation result that incides the angular distribution of the emergent light b2 of outgoing after first prismatic lens 3 from secondary light source 4.
At prism vertex angle is under the situation of 70 degree, such shown in Fig. 7 (a), on-10 degree～10 degree, has angular distribution with respect to the normal direction of shadow surface towards the irradiates light of frontal, angular distribution is wide narrower, such shown in Fig. 7 (b), irradiates light to left and right direction is following and distributing more than 20 degree at-20 degree, all is difficult to the darker angular range seen so just become any light between-20 degree～-10 degree and 10 degree～20 degree, and the observer is difficult to use.
In addition, be that 65 degree (shown in Figure 8) and 60 are spent under the situation of (shown in Figure 9) at prism vertex angle, above-mentioned darker angular regions is quite narrow and be improved.But, when prism vertex angle is 55 degree (shown in Figure 10), on frontal, produce the valley point of brightness, on frontal, can see darker concealed wire.
According to above narration, as can be known as the drift angle of the prism of first prismatic lens 5 60 degree～65 degree preferably.
The have drift angle of use in embodiment 1 is first prismatic lens 3 that 60 triangular prisms of spending are listed as, has directivity at the light b1 that incides first prismatic lens 3 from secondary light source 4 in normal direction, and spend～20-20 respectively with respect to normal direction and spend,-30 degree～30 degree,-35 degree～35 degree,-40 degree～40 degree,-45 degree～45 degree, perhaps-50 has angular distribution on degree～50 degree, promptly, with the normal direction is that the center has 40 degree respectively, 60 degree, 70 degree, 80 degree, 90 degree, under the situation of the wide angular distribution of 100 degree, the emulation of the incident light b1 that has similarly carried out having above-mentioned each angular distribution with embodiment 1 angular distribution of each the emergent light b2 during outgoing on first prismatic lens 3.
Figure 11～Figure 16 is the simulation result of incident light b1 angular distribution during from 3 outgoing of first prismatic lens, emergent light b2 with above-mentioned different separately angular distribution, in each figure, (a) being the angular distribution of incident light b1 that incides the triangle prism row of first prismatic lens 3 from secondary light source 4, (b) is the simulation result of the angular distribution of the emergent light b2 of light b1 during from 3 outgoing of first prismatic lens that incide above-mentioned first prismatic lens 3.
Such shown in Figure 15 (spending upper angles at-45 degree～45 distributes) and Figure 16 (distributing) at-50 degree～50 degree upper angles, if incide the incident light b1 of first prismatic lens 3 with respect to normal direction from secondary light source 4, the angular distribution broadening is to the above scope of-45～45 degree, and then the emergent light b2 from first prismatic lens 3 will increase to the leakage of frontal.In addition, as shown in Figure 11, if incide the narrow scope below-20 degree～20 degree of angular distribution of the incident light b1 of first prismatic lens 3 from above-mentioned secondary light source 4, then the scope from the angular distribution of the emergent light b2 of first prismatic lens 3 also narrows down, the brightness of the inclination that-60 degree are following, 60 degree are above will reduce, so the exposure of left and right directions reduces, scope also will narrow down in addition.
Thereby, as can be known as the angular distribution of the incident light b1 of the triangle prism row that incide first prismatic lens 3 from secondary light source 4, such shown in Figure 12 (distributing), Figure 13 (spending upper angles at-35 degree～35 distributes) and Figure 14 (distributing) at-40 degree～40 degree upper angles at-30 degree～30 degree upper angles, with the normal direction is the center, and the light with the wide angular distribution of 60～80 degree is for best.In addition, the light of above-mentioned angular distribution can obtain by appropriate combination diffuser and field angle adjustment film.
The back lighting device of embodiment of the present invention 4 is with the light from secondary light source, take out as the light that on normal direction, has directivity via prismatic lens, will adjust film 5 and incide first prismatic lens 3 by field angle from the light of secondary light source 4 as the light that on normal direction, has directivity to be substituted in the embodiment 1.
Figure 17 is the pie graph of the back lighting device of embodiment of the present invention 4.
A side opposite with first prismatic lens of first light guide plate in the back lighting device of embodiment 1 adjusted film 5 and diffusion disk 8 and second prismatic lens is set across field angle, in the side opposite with first light guide plate of second prismatic lens second light guide plate is set.Secondary light source 4 is configured in the end face side of second light guide plate 11, in the side opposite with second prismatic lens 13 of second light guide plate 11 reflector plate 9 is set.
In the back lighting device of present embodiment, the light that comes out from first light source 2 among first light guide plate 1 on one side repeatedly total reflection advance on one side, and come out from first light guide plate 1, on the inclined-plane of the triangle prism row of first prismatic lens 3 through reflection and towards the frontal outgoing.In addition, the light that comes out from secondary light source 4 is also with above-mentioned same, on the inclined-plane of the triangle prism of second prismatic lens 13 row through reflection and towards the frontal outgoing, the emergent light that has directivity on normal direction incides the triangle prism row of first prismatic lens 3, same with embodiment 1, from first prismatic lens 3 outgoing to left and right direction.
In addition, the drift angle of the triangle prism of first, second prismatic lens in the back light part of present embodiment is 60 degree, and the angular distribution of light that incides first prismatic lens 3 is identical with Fig. 4, Fig. 5 with simulation result from the angular distribution of the light of first prismatic lens, 3 outgoing.
In addition, in the present embodiment, owing to, adjust less, the luminance efficiency advantage of higher of light that film 5 is absorbed so exist by field angle from the higher light of second prismatic lens, 13 outgoing directivity on normal direction.
Figure 18 is the back lighting device of embodiment of the present invention 5 and the stereographic map that has used its transmission display unit.In addition, Figure 19 is the key diagram of the transmissive state of the transmitted light path of the back lighting device of expression among Figure 18 and transmission-type panel, uses the sectional view perpendicular to the face of the length direction of the groove row that are provided with on first light guide plate.
The back lighting device 10 of present embodiment is that first light guide plate 1 has groove row 1 on the interarea of a side opposite with first prismatic lens 3 in embodiment 1
y, have optically anisotropic optics 1
aBe close to groove row 1
y Groove face 1
z, identical with embodiment 1 in addition.
Further specifically, an interarea in the first related light guide plate 1 of present embodiment is provided with groove row 1 continuously
y, these groove row 1
yLength direction and the incident end face 1 from the light of first light source 2 of first light guide plate 1
x, and the crest line direction almost parallel of the triangle prism of first prismatic lens 3 row.Optics 1
aBe by with having optically anisotropic liquid crystal material with landfill groove row 1
yMode fill and form, have optical anisotropy, and be close to groove row 1
y Groove face 1
z
For example, the first related light guide plate 1 of present embodiment adopts acrylic resin (refractive index 1.49), the optics 1 that present embodiment is related
aHave optical anisotropy, adopt the liquid crystal material (refractive index of long axis direction is 1.5, the refractive index of short-axis direction be 1.7) of UV cured property, and can make as described below.But, as described above, form optics 1
aA side the refractive index of liquid crystal material and the refractive index of first light guide plate 1 about equally.
At first, use the aforesaid propylene acid resin, be produced on and have length direction on the interarea and from the incident end face 1 of the light of first light source 2 by injection mo(u)lding
xThe groove row 1 of almost parallel
yFirst light guide plate 1, and as required at groove row 1
yThe surface form alignment films or implement friction treatment.
Secondly, in order to carry out the groove row 1 of first light guide plate 1
yLandfill, and apply the liquid crystal material of above-mentioned UV cured property, and irradiation ultraviolet radiation hardens, form thus and have optically anisotropic optics 1.
Figure 20 be the expression present embodiment related have an optically anisotropic optics 1
aIn, the synoptic diagram of the state of orientation of liquid crystal molecule.As shown in Figure 20, perpendicular to groove row 1 set on first light guide plate 1
yThe cross sectional shape of length direction be that drift angle γ is about 160～175 degree, the drift angle broad etc. the film triangle.The optics 1 that present embodiment is related
aAs shown in Figure 20, fill the cross section and be triangle groove so that bar-shaped liquid crystal molecule 40 its long axis directions and the smooth interarea of first light guide plate 1 generally perpendicularly be orientated, and form through overcure and to be the triangle prism, have perpendicular to the direction of the interarea of first light guide plate 1 optical anisotropy as optic axis.Here, the refractive index of the short-axis direction of liquid crystal molecule 40 is different with the refractive index of first light guide plate 1, and the refractive index of the refractive index of long axis direction and first light guide plate 1 about equally.
In addition, vertical orientated for more stable formation liquid crystal molecule as described above is as being coated on groove row 1
y Groove face 1
z Alignment films 50, use the polyimide or the polyvinyl alcohol film of band alkyl chain comparatively effective.
Used present embodiment back lighting device 10 transmission display unit as shown in Figure 19, transluscent display panel 7 is set on back lighting device 10, transluscent display panel 7 keeps liquid crystal layer 7c between glass substrate 7a, 7b, and then in the mode that clips glass substrate 7a, 7b polaroid 7d, 7e is set.
Generally speaking, in transmission display unit, the light that comes out from back lighting device 10 is selection wire polarized light component only by means of the polaroid 7e of transluscent display panel 7, and by arriving liquid crystal layer 7c behind the glass substrate 7b.Polaroid has been mostly owing to be found two look absorbabilities, and absorbs the suitable polarisation of light light component of absorption axes with polarization plates 7e among the light that comes out from back lighting device 10.Promptly half of the light that comes out from back lighting device 10 be by useless absorption, and become the essential factor that the light utilization ratio that makes liquid crystal indicator reduces greatly.
Thereby, the back lighting device 10 of present embodiment as shown in Figure 20, by groove row 1 in first light guide plate 1
yLast setting has optically anisotropic optics 1
a, utilize the above-mentioned light that becomes useless, below just action describe.
As shown in Figure 19, the light that comes out from first light source 2 has at the groove row 1 perpendicular to first light guide plate 1
yThe linearly polarized light that length direction (being in the paper) comprises electric field component is a p ripple 2
p, and be parallel to the groove row 1 of first light guide plate 1
yThe linearly polarized light that length direction (promptly with the perpendicular face of paper in) comprises electric field component is a s ripple 2
s, and from end face 1
xIncide first light guide plate 1.
Among the light of incident, p ripple 2
pIn first light guide plate 1 and optics 1
aThe interface on the refringence 0.2 of corresponding acrylic resin and liquid crystal material carry out Fresnel reflection, and surpass the light of critical angle from the radiation of the one side of transluscent display panel 7 sides, utilize first prismatic lens 3 polaroid 7e by transluscent display panel 7 after the frontal bending.At this moment, the axis of homology of polaroid 7e be configured to by the p ripple towards owing to do not have light loss here, so the utilization ratio of light is higher.
On the other hand, from light source 2 come out, from end face 1
xIncide among the light of first light guide plate 1 s ripple 2
sAnd with optics 1
aThe interface on the p ripple that reflects, at optics 1
aThe bottom surface carry out propagating in first light guide plate 1 after the total reflection, on the way because the birefringence that the acrylic resin of first light guide plate 1 has, s ripple 2
sIts phase place also produces p ripple 2 thereupon changing
pComponent, and show with above-mentioned similarly being used to.
In addition, in the present embodiment, as shown in Figure 19, paste reflecting plate 51 and 1/4 wavelength plate 52 at the end face of first light guide plate 1, an opposite side with first light source 2.
Therefore, propagate in first light guide plate 1 and arrive the light of the end face of a side opposite, reflect, incide first light guide plate 1 once more by reflecting plate 51 with first light source 2.At this moment, by 1/4 wavelength plate 52, the s ripple 2 that remaining proportion is higher
sBecome p ripple 2
pIncide the p ripple 2 of first light guide plate 1 once more
pWith above-mentioned similarly with optics 1
aThe interface on reflect, and show with above-mentioned similarly being used to.
As described above, in the back lighting device 10 of present embodiment, can be with the major part of the light that comes out from first light source 2 as p ripple 2
pTake out from first light guide plate 1, and the light of first light source 2 can be used for expeditiously showing and can improve brightness.
In addition, even if use related first light guide plate 1 and the optics 1 of present embodiment
a, owing to do not produce new parasitic light, thus such as shown in Embodiment 1, have directivity and from 1 outgoing of first light guide plate from the light of first light source 2.That is to say, the above-mentioned triangle prism row that incide first prismatic lens 3 from the light of first light source 2 as the light a1 that on the direction that tilts with respect to normal direction, has directivity, and reflect on the inclined-plane of triangle prism row, as exit facet 30 outgoing of the light a2 that on normal direction, has directivity, shine frontal thus from first prismatic lens 3.
Secondly, consider to incide the action of light b1 of the interarea of first light guide plate 1 from secondary light source 4.Has linearly polarized light 4 from the light b1 of secondary light source 4 by polaroid 7e
xWith absorbed linearly polarized light 4
yNo matter, but which kind of light, its electric field component all is parallel to the smooth interarea of first light guide plate 1.About being parallel to the direction of first light guide plate, 1 interarea, because in first light guide plate 1 and optics 1
aThe interface do not have refringence, so these linearly polarized lights can not reflect the ground former state advance.
Thereby, on second light guide plate 11 of the back lighting device of embodiment 4, the groove row similarly are set with related first light guide plate 1 of present embodiment, and make present embodiment related have a groove face that optically anisotropic optics is close to these groove row.Thus, just can make light b1 become the light of holding by the linearly polarized light component of polaroid 7e morely, can improve utilization ratio, the brightness of back lighting device 10 is further improved from the light b1 of secondary light source 4 from secondary light source 4.
Then, just that present embodiment is related optics 1
aAdopt discoid plate-like (discotic) liquid crystal molecule and form, bar-shaped liquid crystal molecule is orientated as shown in Figure 20 and situation about forming describes with replacement.
Figure 21 is the related optics 1 of other back lighting devices of expression present embodiment
aThe synoptic diagram of liquid crystal molecular orientation state.That is to say, use the groove row 1 that are provided with cross sectional shape shown in Figure 20
yFirst light guide plate 1, in the mode of the smooth interarea almost parallel ground of discoid discotic liquid-crystalline molecules 41 its radial directions and first light guide plate 1 orientation with groove row 1
yFill and harden.The orientation of this liquid crystal molecule can be by suitably selecting the groove row 1 of first light guide plate
yGroove face 1
zThe alignment films 50 of last setting and realizing.
Here, with the refractive index and the optics 1 of the acrylic resin of first light guide plate 1
aThe refractive index of radial direction of liquid crystal molecule of plate-like be made as about equally value, be made as different value with the refractive index of aforesaid propylene acid resin with perpendicular to the refractive index of the direction of the radial direction of cholesteric crystal molecule 41.Thus, can with the situation of having used above-mentioned bar-shaped liquid crystal molecule 40 similarly by optics 1
aReflection p ripple, and from first light guide plate 1 outgoing p ripple and be used for showing expeditiously, and can improve brightness.
In the present embodiment, as Figure 20 or as shown in Figure 21, just with first light guide plate, 1 groove row 1
yThe cross section of the perpendicular direction of length direction be that hypotenuse is the triangle of straight line, be close to groove row 1
y Groove face 1
z Optics 1
aThe situation that constitutes triangle prism row is illustrated, but groove row 1
yWith optics 1
aShape be not limited thereto.That is to say, can also be such as shown in figure 22, with the groove row 1 of first light guide plate 1
yThe cross sectional shape of the perpendicular direction of length direction be that hypotenuse is not to be straight line as shown in Figure 20, but than straight line a little laterally or the triangle of inside bend.In the case, if maximum inclination angle α, the β of the curve of hypotenuse are and interarea direction inclination 3 degree～10 degree of first light guide plate 1 just can easily obtain the effect same with present embodiment.
In addition, present embodiment, optics 1
aBe set at a side opposite of first light guide plate 1, but no matter be arranged on first prismatic lens, 3 sides of first light guide plate 1, still and then be arranged on the both sides of first light guide plate 1, can both obtain the effect same with present embodiment with first prismatic lens 3.
In addition, present embodiment has been represented optics 1
aOne side has optically anisotropic situation, but no matter is that first light guide plate, 1 one sides have optical anisotropy, and still two sides have optically anisotropic material, can both obtain the effect same with present embodiment.Wherein, the selected material that constitutes first light guide plate 1 and optics 1a makes first light guide plate 1 and optics 1 so that exist
aRefractive index value about equally refractive index value each other.
In addition, in the present embodiment, because the crest line direction of the triangle prism of first prismatic lens 3 row is parallel to the incident end face from the light of first light source 2 of first light guide plate 1, thus can make from the light of first prismatic lens, 3 outgoing easily in 3 of first prismatic lenses evenly.And then, owing to establish the groove row 1 of first light guide plate 1
yThe crest line direction of triangle prism row of length direction and first prismatic lens 3 parallel, so can prevent to prevent rotation during by first prismatic lens 3 at polarized light.And, because the groove row 1 of first light guide plate 1
yLength direction be parallel to incident end face 1 from the light of first light source 2
xSo, be difficult to take place brightness disproportionation.
Figure 23 is the key diagram of transmissive state of transmitted light path and the transmission-type panel of the back lighting device of expression embodiment of the present invention 6 and the transmission display unit that has used it, adopt with first light guide plate on the sectional view of the perpendicular face of the length direction that is listed as of the groove that is provided with.
The back lighting device 10 of present embodiment obtains optics 1 by bar-shaped liquid crystal molecule used in the embodiment 5 is orientated on the direction different with embodiment 5
a, identical with embodiment 5 in addition.
That is to say that present embodiment is related has anisotropic optics 1
aBe to make the long axis direction of bar-shaped liquid crystal molecule be parallel to first light guide plate, 1 groove row 1
yLength direction direction, that is to say that face direction perpendicular to paper is orientated and obtain.
First light guide plate 1 that present embodiment is related, acrylic resin that will be identical with above-mentioned embodiment be as moulding material, for example with the groove row 1 of first light guide plate 1
yThe perpendicular side of length direction inlet (door) when inner chamber injects the moulding material that has melted is set, and make by injection mo(u)lding.
Then, for the groove row 1 of landfill first light guide plate 1
y, the liquid crystal material of used identical UV cured property in coating and the embodiment 5, and irradiation ultraviolet radiation hardens, and makes the groove row 1 of its long axis direction of rod shaped liquid crystal molecule and first light guide plate 1
yLength direction be orientated abreast, form and to have optically anisotropic optics 1
a
On the other hand, groove row 1 have been formed in suitable making
yFirst light guide plate 1 after, with lapping compound to groove face 1
zRub, afterwards,, similarly apply the liquid crystal material of UV cured property and harden, make the groove row 1 of rod shaped liquid crystal molecule 40 its long axis directions and first light guide plate 1 thus with above-mentioned also by selecting lapping compound
yLength direction be orientated abreast, form and to have optically anisotropic optics 1
a
In addition, the optics 1 that obtains as described above
aOptic axis just become and be parallel to groove row 1
yLength direction.
Such as shown in figure 23, come out from first light source 2, and from end face 1
zIncide the s ripple 2 among the light of first light guide plate 1
s, in first light guide plate 1 and optics 1
aThe interface on corresponding refringence 0.2 carry out Fresnel reflection, and simultaneously radiate light above critical angle from transluscent display panel 7 sides, utilize first prismatic lens 3 polaroid 7e by transluscent display panel 7 after the frontal a2 bending.At this moment, the axis of homology of polaroid 7e be configured to by the s ripple towards owing to do not have light loss here, so the utilization ratio of light is higher.In addition, because the Fresnel reflection rate of s ripple is also higher than p ripple,, has the effect of the light utilization ratio that can improve generally so light is easy from the taking-up of light guide plate.
As described above, in the back lighting device 10 of present embodiment, can be with the major part of the light that comes out from first light source 2 as s ripple 2
sTake out from first light guide plate 1, the light of first light source 2 can be used for expeditiously showing and can improve brightness.
In addition, even if use related first light guide plate 1 and the optics 1 of present embodiment
a, owing to do not produce new parasitic light, thus such as shown in Embodiment 1, have directivity and from 1 outgoing of first light guide plate from the light of first light source 2.That is to say, the above-mentioned triangle prism row that incide first prismatic lens 3 from the light of first light source 2 as the light a1 that on the direction that tilts with respect to normal direction, has directivity, and reflect on the inclined-plane of triangle prism row, as the light a2 outgoing that has directivity in normal direction, shine frontal from the exit facet 30 of first prismatic lens 3 thus.
Secondly, consider to incide the action of light b1 of the interarea of first light guide plate 1 from secondary light source 4.Has linearly polarized light 4 from the light b1 of secondary light source 4 by polarization plates 7e
xWith absorbed linearly polarized light 4
y, electric field component is perpendicular to the groove row 1 of first light guide plate 1
yThe linearly polarized light of length direction because at first light guide plate 1 and optics 1
yThe interface on because of there not being refringence to pass through.On the other hand, electric field component is parallel to the groove row 1 of first light guide plate 1
yThe linearly polarized light of length direction, at first light guide plate 1 and optics 1
yThe interface on reflect because of refringence.For this reason, wish optics 1
aBe that drift angle is the obtuse angle degree of 170～175 degree.
In addition, even if replace the related optics 1 of present embodiment
a, the smooth interarea almost parallel ground that makes the radial direction of liquid crystal molecule 41 of discoid plate-like and first light guide plate 1 is orientated and forms optics 1
a, also can obtain the effect same with present embodiment.That is to say, can with come out from first light source 2, from end face 1
xIncide the s ripple 2 among the light of first light guide plate 1
sTake out expeditiously from first light guide plate 1, and show with above-mentioned similarly being used for expeditiously.But in the case, with the refractive index and the optics 1 of the acrylic resin of first light guide plate 1
aThe refractive index of radial direction of cholesteric crystal be made as different value, and be made as about equally value with the refractive index of acrylic resin with the refractive index of the perpendicular direction of the radial direction of cholesteric crystal molecule.
Figure 24 is the pie graph of structure of the transmission display unit of expression embodiment of the present invention 7, has used the back lighting device 10 of transluscent display panel 7 with embodiment 1.On transluscent display panel 7, come display image signals by the image-driven parts, in back lighting device 10, come out from the light of first light source, 2 outgoing from first light guide plate 1, reflect and advance towards frontal in the prism facets of first prismatic lens 3, in addition, the light that has directivity on normal direction from secondary light source is crooked to left and right direction by first prismatic lens 3, shines the frontal and the left and right directions of transluscent display panel 7 respectively.
The back lighting device 10 that is being used for present embodiment, such shown in Fig. 4 (b), the light that comes from first light source 2 is with respect to normal direction, carries out optically focused and towards observer's outgoing on-20 degree～20 degree, can give the observer of frontal with being presented at image transfer on the transluscent display panel 7.
On the other hand, such shown in Fig. 5 (b), the light that comes from secondary light source 4 is with respect to normal direction, at-30 degree following and 30 more than spending the enterprising line bend of left and right directions and towards observer's outgoing, can will be presented at that image on the transluscent display panel 7 departs from frontal and the observer that passes to left and right directions.
In addition, in the present embodiment, adjust frontal and left and right directions independently, just can shine uniform light thus with the field angle of broadness by light source control portion 6.
Figure 25 is the pie graph of the transmission display unit of embodiment of the present invention 8, has increased driven in synchronism portion on the transmission display unit of embodiment 5～7.
On transluscent display panel 7, alternately show 2 different picture signals by the image-driven parts, and synchronize them in above-mentioned each picture signal by driven in synchronism portion 16, alternately switch the secondary light source of the left and right directions of first light source of frontal of irradiation transluscent display panel 7 and irradiation transluscent display panel 7.Particularly, use driven in synchronism portion 16, the period that the image of using at frontal is shown is lighted first light source 2, and light secondary light source 4 in the period that the image that left and right directions is used is shown, and when side's light source igniting, the opposing party's light source being extinguished, this switches by light source control portion 6.
Figure 26 is the key diagram of display image that utilizes the transmission display unit of embodiment of the present invention 8, Figure 26 (a) is directed to the observer's of frontal image with from the angular distribution of the irradiates light of back lighting device, and Figure 26 (b) is directed to the observer's of left and right directions image with from the angular distribution of the irradiates light of back lighting device.
By the back lighting device relevant 10 with present embodiment, shown in Fig. 4 (b) like that with respect to normal direction the light of the angular distribution that is converged on-20 degree～20 degree and as Fig. 5 (b) shown in like that with respect to the rayed transluscent display panel 7 of normal direction in the angular distribution of the bending of direction to the left and right that-30 degree are following more than spending with 30.On the other hand, the A image of on liquid crystal panel 20 frontal being used by the image-driven parts alternately shows with these two different images of B image that left and right directions is used.Thereby, by driven in synchronism portion 16, make above-mentioned each picture signal and utilize first light source 2 of light source control portion 6 to carry out synchronously with the switching of secondary light source 4, if this switching is carried out repeatedly with the frequency more than the 60Hz, then such as shown in figure 26, the A image is by the observer of frontal identification brightly, and the B image is as continuous bright image and by the identification of the observer of left and right directions institute.
As described above, acquisition can show the image that the observer that faces is easy to see, and to from about vergence direction watch around people show different images, can make image that positive observer watches to around the people hide such effect.
In addition, in back lighting device 10, be set at the face side opposite of first light guide plate, leak into the light of below so play absorption from first light guide plate 3, and prevent to become the effect of parasitic light with prism side because field angle is adjusted film 5.Because by reducing parasitic light, and the light that leaks into left and right directions when top first light source 4 is lighted tails off, so the danger that direct picture is spied on from left and right directions reduces.
Claims (15)
1. back lighting device is characterized in that possessing:
First prismatic lens has triangle prism row on a face;
First light source, the light that has directivity on the direction that will tilt in the exit facet normal direction with respect to the side opposite with above-mentioned triangle prism row of this first prismatic lens incides the triangle prism row of above-mentioned first prismatic lens; And
Secondary light source, the light that will have directivity on the normal direction of the exit facet of above-mentioned first prismatic lens incides the triangle prism row of above-mentioned first prismatic lens.
2. the back lighting device of putting down in writing according to claim 1 is characterized in that possessing:
First light guide plate is arranged on the face side of the triangle prism row of first prismatic lens,
Wherein, first light source is arranged on the end face side of above-mentioned first light guide plate, and secondary light source is arranged on a side opposite with above-mentioned first prismatic lens of above-mentioned first light guide plate.
3. the back lighting device of putting down in writing according to claim 1 is characterized in that:
Incide the light of the triangle prism row of first prismatic lens from secondary light source, the normal direction that has with the exit facet of first prismatic lens is the wide angular distribution of 60 degree～80 degree at center.
4. the back lighting device of putting down in writing according to claim 3 is characterized in that:
The prism vertex angle of triangle prism row is 60 degree～65 degree.
5. the back lighting device of putting down in writing according to claim 2 is characterized in that:
Secondary light source is adjusted film and is provided with across field angle.
6. the back lighting device of putting down in writing according to claim 2 is characterized in that possessing:
Second prismatic lens is arranged on the side opposite with first prismatic lens of first light guide plate; And
Second light guide plate is arranged on the side opposite with above-mentioned first light guide plate of above-mentioned second prismatic lens, and
Secondary light source is arranged on the end face side of above-mentioned second light guide plate.
7. the back lighting device of putting down in writing according to claim 2 is characterized in that:
First light guide plate has the continuous groove row that are provided with in crest line direction almost parallel ground of the triangle prism row of the length direction and first prismatic lens at least one side's interarea,
And possess the groove face of being close to these groove row and have optically anisotropic optics.
8. the back lighting device of putting down in writing according to claim 7 is characterized in that:
One side's of optics the refractive index and the refractive index of first light guide plate are about equally.
9. the back lighting device of putting down in writing according to claim 7 is characterized in that:
Optics is, and to be the long axis direction that makes this liquid crystal molecule with bar-shaped liquid crystal molecular orientation be formed generally perpendicularly with respect to the interarea of first light guide plate.
10. the back lighting device of putting down in writing according to claim 7 is characterized in that:
Optics is to be that the interarea almost parallel ground of the radial direction of this liquid crystal molecule and first light guide plate is formed with discoid liquid crystal molecular orientation.
11. the back lighting device according to claim 7 is put down in writing is characterized in that:
Optics is to be the length direction almost parallel ground formation that makes the groove row of the long axis direction of this liquid crystal molecule and first light guide plate with bar-shaped liquid crystal molecular orientation.
12. the back lighting device according to claim 6 is put down in writing is characterized in that:
Second light guide plate has the continuous groove row that are provided with in crest line direction almost parallel ground of the triangle prism row of the length direction and second prismatic lens at least one side's interarea,
And possess the groove face of being close to these groove row and have optically anisotropic optics.
13. the back lighting device according to claim 1 is put down in writing is characterized in that:
The light source control portion that possesses the action of controlling first, second light source independently.
14. a transmission display unit possesses the back lighting device that transluscent display panel and claim 1 are put down in writing.
15. a transmission display unit possesses:
Transluscent display panel;
The image-driven parts that on transluscent display panel, alternately show 2 different picture signals;
The back lighting device that claim 13 is put down in writing;
Make the flicker of first, second light source of the light source control portion that utilizes this back lighting device be synchronized with above-mentioned each picture signal, and the driven in synchronism portion of alternately switching.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007038030 | 2007-02-19 | ||
| JP2007038030 | 2007-02-19 | ||
| JP2007267800 | 2007-10-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101251674A true CN101251674A (en) | 2008-08-27 |
| CN100585469C CN100585469C (en) | 2010-01-27 |
Family
ID=39907792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810009648A Active CN100585469C (en) | 2007-02-19 | 2008-02-19 | Backlight device and transmission type display apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4780081B2 (en) |
| CN (1) | CN100585469C (en) |
| TW (1) | TW200844576A (en) |
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| US11946621B2 (en) | 2020-07-02 | 2024-04-02 | Lumileds Llc | Integrated optical system for dynamic diffuse and directional lighting |
| CN115047672A (en) * | 2021-03-09 | 2022-09-13 | 矽光学有限公司 | Lighting device for a display screen having at least two operating modes |
| CN113204070A (en) * | 2021-04-23 | 2021-08-03 | 伟时电子股份有限公司 | Backlight module and double-vision display device |
| CN113204070B (en) * | 2021-04-23 | 2023-11-03 | 伟时电子股份有限公司 | Backlight module and double-vision display device |
| CN113641042A (en) * | 2021-08-13 | 2021-11-12 | 武汉华星光电技术有限公司 | Display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4780081B2 (en) | 2011-09-28 |
| JP2008235245A (en) | 2008-10-02 |
| TW200844576A (en) | 2008-11-16 |
| CN100585469C (en) | 2010-01-27 |
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