CN104516050A - Light guide plate and manufacturing method thereof, surface light source device, transmission type image display device, design method of grading pattern for light guide plate - Google Patents

Light guide plate and manufacturing method thereof, surface light source device, transmission type image display device, design method of grading pattern for light guide plate Download PDF

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Publication number
CN104516050A
CN104516050A CN201410514391.9A CN201410514391A CN104516050A CN 104516050 A CN104516050 A CN 104516050A CN 201410514391 A CN201410514391 A CN 201410514391A CN 104516050 A CN104516050 A CN 104516050A
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CN
China
Prior art keywords
reflection spot
light
guide plate
light guide
light reflection
Prior art date
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Pending
Application number
CN201410514391.9A
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Chinese (zh)
Inventor
百田健太郎
岛田芳永
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Seiren Co Ltd
Sumitomo Chemical Co Ltd
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Seiren Co Ltd
Sumitomo Chemical Co Ltd
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Application filed by Seiren Co Ltd, Sumitomo Chemical Co Ltd filed Critical Seiren Co Ltd
Publication of CN104516050A publication Critical patent/CN104516050A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0095—Light guides as housings, housing portions, shelves, doors, tiles, windows, or the like
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

A light guide plate and a manufacturing method thereof, a surface light source device, a transmission type image display device, and a design method of a grading pattern for the light guide plate. The task of the invention is to provide a light guide plate which can reduce linear brightness nonuniformity of a junction part of an ink gun, and in addition, can reduce isoheight-shaped patterns caused by light reflection point patterns from being seen. A light guide plate (1) in one embodiment of the invention is that in a light guide plate with light reflection points 12 formed on at least one face S2 of a light guide plate base material 11, in all areas formed by segmenting the at least one face S2 of the light guide plate base material 11 into a plurality of areas, grid points used for a printing objective are regularly arranged in a two-dimensional mode, the plurality of light reflection points 12a are formed on the grid points, and in all the areas, part of the light reflection points irregularly selected from the plurality of light reflection points 12a are replaced by replacing light reflection points 12b different from the plurality of light reflection points 12a in size.

Description

The method for designing of light guide plate and manufacture method thereof, planar light source device, transmission image display device, light guide plate light distribution patterns
Technical field
The present invention relates to light guide plate, planar light source device, transmission image display device, the method for designing of light guide plate light distribution patterns and the manufacture method of light guide plate.
Background technology
The transmission image display devices such as liquid crystal display device generally have and utilize light guide plate to supply the planar light source device of planar light as backlight.As the mode of planar light source device, have and the straight-down negative of light source is set in the rear side of light guide plate and the edge-light mode of light source is set along the side of light guide plate.Edge-light mode is favourable from the viewpoint of the slimming of image display device.
In the planar light source device of edge-light mode, the light distribution patterns of the rear side of light guide plate is arranged at (such as from the light utilization of the incident sideways of light guide plate, the light distribution patterns be made up of light reflection spot) effect and reflect and spread (scattering), the outgoing plane of the light of angular components more than critical angle from light guide plate is penetrated, thus supply planar light.In order to make the brightness uniformity of its light-emitting area, in the light guide plate described in patent documentation 1 and 2, implement make the density of light distribution patterns along with to light source away from and by rare to close gradual change.
In addition, in patent documentation 1, also disclose the method being formed the light distribution patterns of this point-like by drop ejection (such as, ink jet printing).Such as, in ink jet printing method, sometimes in order to shorten the print cycle, making the multiple arrangement of ink gun and printing.
Patent documentation 1: Japanese Unexamined Patent Publication 2004-240294 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2008-27609 publication
Summary of the invention
But, if make the multiple arrangement of ink gun and print, then due to its installation accuracy and position Adjustment precision, cause the brightness irregularities (striped is uneven) producing wire at ink gun linking portion each other.In this, if the position for more precisely adjusting ink gun, then need a large amount of time and labors.Especially in the region that the covering rate of light reflection spot is high, the brightness irregularities (striped is uneven) of wire is produced in ink gun linking part branch each other.
In addition, for the light guide plate for the mobile terminal such as notebook computer, tablet terminal, slimming is sought.If make the lower thickness of light guide plate, then in order to obtain identical brightness, the diameter of light reflection spot can be reduced.But, if make the lower thickness of light guide plate, then there is the trend of the pattern easily seeing light reflection spot from outgoing plane side.During the gradual change of especially changing the diameter administration phase of light reflection spot, in the region that the covering rate of light reflection spot is lower, that is, in the region that the diameter of light reflection spot is little, due to the pattern of light reflection spot, cause sometimes can seeing contour line effect.
Therefore, the object of the present invention is to provide the brightness irregularities of the wire that can reduce in ink gun linking portion each other, and the light guide plate seen of the contour line effect caused by light reflecting dot pattern, planar light source device, transmission image display device, the method for designing of light guide plate light distribution patterns and the manufacture method of light guide plate can be reduced.
Present inventors etc. conduct in-depth research repeatedly, it found that, by a part of light reflection spot in the multiple smooth reflection spot be selected from brokenly on light distribution patterns is substituted by the size light reflection spot different from the plurality of smooth reflection spot, the brightness irregularities of the wire in ink gun linking portion each other can be reduced, in addition, even if make light guide plate slimming and the diameter of reduction light reflection spot, also seeing of the contour line effect caused by light reflecting dot pattern can be reduced in the region that the covering rate of light reflection spot is low.
Therefore, with regard to light guide plate of the present invention, light reflection spot is formed at least one side of light guide plate base, wherein, the at least one side of light guide plate base is being divided into the regional in multiple region, and two-dimensional arrangements has the grid point for printing target regularly, and this grid point is formed multiple smooth reflection spot, in regional, a part of light reflection spot be selected from brokenly in multiple smooth reflection spot is substituted by the size replacement light reflection spot different from the plurality of smooth reflection spot.
According to this light guide plate, the a part of light reflection spot selected brokenly from the multiple smooth reflection spot of two-dimensional arrangements is regularly substituted by the size replacement light reflection spot different from the plurality of smooth reflection spot, therefore in the region that the covering rate of light reflection spot is high, the brightness irregularities of the wire in ink gun linking portion each other can be reduced.In addition, according to this light guide plate, even if make light guide plate slimming and the diameter of reduction light reflection spot, also seeing of the contour line effect caused by the pattern of light reflection spot can be reduced in the region that the covering rate of light reflection spot is low.
The Replacement rate of above-mentioned replacement light reflection spot can be 0.1% ~ 5% of the quantity of grid point.If increase the Replacement rate of light reflection spot, then the change (gradual change) of covering rate becomes discontinuous sometimes, produces the brightness irregularities of local.The brightness irregularities of local refers to 1cm 2the light and shade of left and right is uneven, and the brightness irregularities of this local is sometimes overall in light guide plate, and low being coated to especially near light in part commands troops to manifest consumingly, sometimes occurs brokenly with the interval of 2 ~ 5cm.But, thus, the Replacement rate of light reflection spot is less 0.1% ~ 5%, therefore the generation of the brightness irregularities of local can be suppressed, reduce the brightness irregularities of the wire in ink gun linking portion each other simultaneously, in addition, seeing of the contour line effect that caused by the pattern of light reflection spot can be reduced.
In addition, if increase the Replacement rate of light reflection spot, then in the region that the covering rate of light distribution patterns as the light in part side close with light source is low, brightness irregularities is remarkable.But thus, the Replacement rate of light reflection spot is less 0.1% ~ 5%, therefore can reduce the brightness irregularities of the wire in ink gun linking portion each other, in addition, can reduce seeing of the contour line effect caused by the pattern of light reflection spot.
In addition, at above-mentioned regional, also can between except a part of light reflection spot in multiple smooth reflection spot.Present inventors etc. obtain following opinion: by except the part in the multiple smooth reflection spot in light distribution patterns, can reduce the brightness irregularities of the wire in ink gun linking portion each other.Thus, except by a part of light reflection spot in the multiple smooth reflection spot of two-dimensional arrangements regularly, the brightness irregularities of the wire in ink gun linking portion each other therefore can be reduced further.
In addition, at above-mentioned regional, also can a part of light reflection spot in multiple smooth reflection spot by between except grid point in a part of grid point on configuration replace light reflection spot.By this formation, also can reduce the brightness irregularities of the wire in ink gun linking portion each other, in addition, seeing of the contour line effect caused by the pattern of light reflection spot can be reduced.
In addition, the diameter of above-mentioned multiple smooth reflection spot can be 10 μm ~ 100 μm, and the diameter replacing light reflection spot can be 10 μm ~ 80 μm.If relative to the size of multiple smooth reflection spot, the size differences replacing light reflection spot is very large, then the change (gradual change) of covering rate becomes discontinuous sometimes, produces the brightness irregularities of local.But, thus, the size replacing light reflection spot is the centre of the scope of the size that multiple smooth reflection spot can obtain in the change (gradual change) of covering rate, therefore the generation of the brightness irregularities of local can be suppressed, reduce the brightness irregularities of the wire in ink gun linking portion each other simultaneously, in addition, seeing of the contour line effect that caused by the pattern of light reflection spot can be reduced.
In addition, the thickness of above-mentioned light guide plate base can be 0.1 ~ 1.0mm.So, in the light guide plate that the thickness of light guide plate base is as thin as 0.1 ~ 1.0mm and the diameter of light reflection spot is little, the effect seen reducing the contour line effect caused by the pattern of light reflection spot is large.
In addition, the covering rate of above-mentioned multiple smooth reflection spot be less than 30% above-mentioned regional can account for light guide plate base at least one side more than 50%.So, the region being low to moderate less than 30% in the covering rate of light reflection spot accounts in the light guide plate of more than 50%, and the effect seen reducing the contour line effect caused by the pattern of light reflection spot is large.
In addition, the method for designing of light guide plate light distribution patterns of the present invention is the method for designing of the light distribution patterns be made up of the light reflection spot that at least one side is formed in light guide plate base, it comprises following operation: covering rate setting operation, the at least one side of light guide plate base is divided into multiple region, to each region setting covering rate be split to form; Grid point setting operation, to the grid point of each region setting for printing target, this grid point is by two-dimensional arrangements regularly; Grid point calculation process, obtains the quantity of grid point to each region; Light reflection spot setting operation, to each region, based on the quantity of covering rate and grid point, to meet the mode of covering rate, sets the size and number of the multiple smooth reflection spot formed in grid point; Light reflection spot arrangement step, to each region, based on the size and number of the light reflection spot set in light reflection spot setting operation, grid point configures multiple smooth reflection spot; Replace light reflection spot setting operation, replace the size and number of light reflection spot in the setting of each region, above-mentioned replacement light reflection spot is for being substituted in the part in the multiple smooth reflection spot that configures in light reflection spot arrangement step, and size is different from multiple smooth reflection spot; And light reflection spot replaces operation, to each region, based on the quantity replacing the replacement light reflection spot set in light reflection spot setting operation, from the multiple smooth reflection spot configured light reflection spot arrangement step, select a part of light reflection spot brokenly, the replacement light reflection spot replacing and set in light reflection spot setting operation will be substituted by by a part of light reflection spot selected.
The method for designing of this light guide plate light distribution patterns is also described above is substituted by the size replacement light reflection spot different from multiple smooth reflection spot by from by a part of light reflection spot selected brokenly in the multiple smooth reflection spot of two-dimensional arrangements regularly, therefore can reduce the brightness irregularities of the wire in ink gun linking portion each other.In addition, according to this light guide plate, even if make light guide plate slimming and the diameter of reduction light reflection spot, also seeing of the contour line effect caused by light reflecting dot pattern can be reduced in the region that the covering rate of light reflection spot is low.
In addition, in above-mentioned replacement light reflection spot setting operation, the mode that can become 0.1% ~ 5% of the quantity of grid point with the Replacement rate replacing light reflection spot sets the quantity of replacement light reflection spot.Thus, as mentioned above, the Replacement rate of light reflection spot is less 0.1% ~ 5%, therefore the generation of the brightness irregularities of local can be suppressed, reduce the brightness irregularities of the wire in ink gun linking portion each other simultaneously, in addition, seeing of the contour line effect that caused by light reflecting dot pattern can be reduced.
In addition, thus, as mentioned above, the Replacement rate of light reflection spot is less 0.1% ~ 5%, therefore the generation of the brightness irregularities of local can be suppressed, reduce the brightness irregularities of the wire in ink gun linking portion each other simultaneously, in addition, seeing of the contour line effect caused by light reflecting dot pattern can be reduced.
In addition, in above-mentioned smooth reflection spot setting operation, be little compared with the quantity of above-mentioned grid point by the quantity set of multiple smooth reflection spot, in above-mentioned smooth reflection spot arrangement step, with except the mode of a part of light reflection spot in multiple smooth reflection spot, grid point configures multiple smooth reflection spot.Thus, as mentioned above, by a part of light reflection spot in the multiple smooth reflection spot of two-dimensional arrangements regularly by between remove, therefore can reduce the brightness irregularities of the wire in ink gun linking portion each other further.
In addition, above-mentioned smooth reflection spot replaces in operation, based on the quantity replacing the replacement light reflection spot set in light reflection spot setting operation, from a part of light reflection spot in smooth reflection spot multiple light reflection spot arrangement step by between except grid point in select a part of grid point brokenly, also can be configured in by a part of grid point of selecting the part replacing the replacement light reflection spot set in light reflection spot setting operation.Thus, as mentioned above, the brightness irregularities of the wire in ink gun linking portion each other can be reduced, in addition, seeing of the contour line effect caused by the pattern of light reflection spot can be reduced.
In addition, the method for designing of above-mentioned light guide plate light distribution patterns also can be the method for designing of the light distribution patterns be made up of the light reflection spot that at least one side is formed of the light guide plate base being 0.1 ~ 1.0mm at thickness.So, be as thin as 0.1 ~ 1.0mm at the thickness of light guide plate base, and in the little light guide plate of the diameter of light reflection spot, the effect seen reducing the contour line effect caused by the pattern of light reflection spot is large.
In addition, the method for designing of above-mentioned light guide plate light distribution patterns also can be the method for designing of the light distribution patterns that the light reflection spot that at least one side is formed that the regional being less than 30% by the covering rate setting in operation the multiple smooth reflection spot set in covering rate accounts for the light guide plate base of more than 50% is formed.So, the region being low to moderate less than 30% in the covering rate of light reflection spot accounts in the light guide plate of more than 50%, and the effect seen reducing the contour line effect caused by the pattern of light reflection spot is large.
In addition, the manufacture method of light guide plate of the present invention is use the unit being arranged with multiple printing position for carrying out printing that possesses more than 2 and the printing equipment that arranges in the orientation at printing position of unit, be manufactured on the method at least simultaneously forming the light guide plate of the light distribution patterns be made up of light reflection spot of light guide plate base, utilize the method for designing design light distribution patterns of above-mentioned light guide plate light distribution patterns, while relative to light guide plate base relative mobile unit, above-mentioned light distribution patterns is printed in light guide plate base by the printing position of range site.
According to the manufacture method of this light guide plate, owing to using the method for designing of above-mentioned light guide plate light distribution patterns, therefore the brightness irregularities of the wire in ink gun linking portion each other can be reduced, even if make light guide plate slimming and the diameter of reduction light reflection spot, also seeing of the contour line effect caused by the pattern of light reflection spot can be reduced in the region that the covering rate of light reflection spot is low.
Above-mentioned printing position is nozzle, and said units is the ink gun arranging multiple nozzle, and above-mentioned smooth reflection spot is light guide plate uv-curing type ink jet ink.
Other light guide plate of the present invention possesses and utilizes the method for designing of above-mentioned light guide plate light distribution patterns and the light distribution patterns designed.In addition, another light guide plate of the present invention utilizes the manufacture method of above-mentioned light guide plate to manufacture.
Also the replacement light reflection spot from being substituted by different size by a part of light reflection spot selected brokenly the multiple smooth reflection spot of two-dimensional arrangements regularly described above in this light guide plate, therefore the brightness irregularities of the wire in ink gun linking portion each other can be reduced, in addition, even if make light guide plate slimming and the diameter of reduction light reflection spot, also seeing of the contour line effect caused by the pattern of light reflection spot can be reduced in the region that the covering rate of light reflection spot is low.
Planar light source device of the present invention is the planar light source device of edge-light type, possesses: the light source of above-mentioned light guide plate and the side supply light to light guide plate.According to this planar light source device, owing to possessing above-mentioned light guide plate, the brightness irregularities of the planar light source device of edge-light type therefore can be reduced.
Transmission type image device of the present invention possesses above-mentioned planar light source device and opposed with the outgoing plane of planar light source device the transmission type image display part configured.According to this transmission image display device, owing to possessing the planar light source device with above-mentioned light guide plate, the brightness irregularities of transmission image display device therefore can be reduced.
According to the present invention, easily can reduce the brightness irregularities of the wire in ink gun linking portion each other, in addition, seeing of the contour line effect caused by the pattern of light reflection spot can be reduced.In addition, the edge-light type planar light source device employing this light guide plate can be reduced, and employ the brightness irregularities of transmission image display device of this edge-light type planar light source device.
Accompanying drawing explanation
Fig. 1 is the sectional view of the transmission image display device representing the embodiment possessing light guide plate involved in the present invention.
Fig. 2 is vertical view when observing light guide plate from rear side.
Fig. 3 is the figure of the embodiment representing the light distribution patterns formed by multiple smooth reflection spot in detail.
Fig. 4 is the figure of an embodiment of the covering rate setting operation represented in the method for designing of light guide plate light distribution patterns involved in the present invention.
Fig. 5 is the figure of an embodiment of the grid point setting operation represented in the method for designing of light guide plate light distribution patterns involved in the present invention.
Fig. 6 is the figure of the modified example representing the grid point setting operation shown in Fig. 5.
Fig. 7 is the figure of the modified example representing the grid point setting operation shown in Fig. 5.
Fig. 8 is the figure of the modified example representing the grid point setting operation shown in Fig. 5.
Fig. 9 is the figure of an embodiment of the grid point calculation process represented in the method for designing of light guide plate light distribution patterns involved in the present invention.
Figure 10 is the figure of the embodiment representing light reflection spot setting operation in the method for designing of light guide plate light distribution patterns involved in the present invention and light reflection spot arrangement step.
Figure 11 represents that replacement light reflection spot setting operation in the method for designing of light guide plate light distribution patterns involved in the present invention and light reflection spot replace the figure of an embodiment of operation.
Figure 12 is the stereographic map of an embodiment of the manufacture method representing light guide plate.
Figure 13 is the schematic diagram of the example representing printing process.
Embodiment
Below, with reference to accompanying drawing, the preferred embodiment of the present invention is described in detail.Should illustrate, the symbol identical to portion markings same or equivalent in each accompanying drawing.
Fig. 1 is the sectional view of the transmission image display device representing the embodiment possessing light guide plate involved in the present invention.Transmission image display device 100 shown in Fig. 1 is formed primarily of planar light source device 20 and transmission type image display part 30.Planar light source device 20 is the edge-light type planar light source devices possessing the light guide plate 1 with light guide plate base 11 and the side being arranged at light guide plate 1 and light guide plate 1 is supplied to the light source 3 of light.
Light guide plate base 11 presents rectangular shape substantially, has outgoing plane S1, the back side S2 of opposition side of outgoing plane S1 and 4 end face S3 intersecting with outgoing plane S1 and back side S2 1~ S3 4.In the present embodiment, 4 end face S3 1~ S3 4vertical with back side S2 with outgoing plane S1 substantially.
Light guide plate base 11 is made up of translucent material, be preferably poly-(methyl) acid alkyl ester resin sheet material, polystyrene sheet material or polycarbonate-based resin sheet, among these, be preferably plexiglass sheet material (PMMA resin sheet).Light guide plate base 11 can comprise diffusion particle.Light guide plate base 11 as shown in the embodiment for tabular surface, also can have concaveconvex shape with the surface (outgoing plane S1) of surface (back side S2) opposition side being formed with light reflection spot 12.In addition, the thickness of light guide plate base 11 is 0.1 ~ 3.0mm, is preferably 0.1 ~ 1.0mm, more preferably 0.1 ~ 0.8mm.
The back side S2 of light guide plate base 11 can be the face of the almost whole surface of back side S2 having been implemented to liquid-proof process.The liquid-proof process implemented back side S2 makes contact angle when dripping water droplet to back side S2 become the liquid-proof process of 80 degree ~ 130 degree, preferably makes contact angle become 85 degree ~ 120 degree, more preferably make contact angle become the liquid-proof process of 90 degree ~ 110 degree.In the present embodiment, contact angle refers to static contact angle.
Multiple smooth reflection spot 12 is formed in the S2 side, the back side of this light guide plate base 11.That is, light guide plate 1 has the multiple smooth reflection spot 12 being arranged at S2 side, the back side further.The maximum gauge of each smooth reflection spot 12 is preferably less than 20 μm, is more preferably less than 15 μm.In addition, the shape of each smooth reflection spot 12 is circle, ellipse, quadrangle, rectangle, rhombus, triangle.Among these, from the ease that light reflection spot makes, the shape of light reflection spot 12 is preferably circular or oval.In addition, due to forming errors, the symmetry of light reflection spot shape also may be out of shape (also can be asymmetric).
As shown in Figure 2, multiple smooth reflection spot 12 overleaf S2 configures disconnected from each otherly.Fig. 2 is vertical view when observing light guide plate from rear side.In fig. 2, for convenience of description, also display light source 3 together.As shown in Figure 2, light reflection spot 12 is little in the light in part side close with light source 3, along with to light source 3 away from and become large.The whole surface of light reflection spot 12 S2 is overleaf formed as the grid point of two-dimensional arrangements regularly, and therefore the covering rate of light reflection spot 12 is low in the light in part side close with light source 3, along with to light source 3 away from and uprise.Preferred light reflection spot 12 does not link each other, but in fact sometimes also can link.Now, from the incident sideways of light guide plate to a part for the light in light guide plate diffuse reflection by the light reflection spot at the back side, outgoing plane side is incident to.In fig. 2, change the size of light reflection spot 12, number etc. for convenience of description, as described below, the number of light reflection spot 12 and configuration pattern adjust in the mode penetrating uniform planar light from outgoing plane S1 efficiently.
Fig. 3 is the figure representing the light distribution patterns formed by multiple smooth reflection spot 12 in detail.As shown in Figure 3, in the present embodiment, the back side S2 of light guide plate base 11 is divided into 7 × 9 region A 1,1~ A 7,9, to each region A m, nthe size of design light reflection spot 12 and covering rate etc. (m is 1 ~ 7, n is 1 ~ 9).At regional A m, nin, multiple smooth reflection spot 12a is formed on for printing target and by the grid point of two-dimensional arrangements regularly.In the present embodiment, in grid point, multiple smooth reflection spot 12a is configured in a mode for a part of light reflection spot removed in multiple smooth reflection spot 12a.In addition, a part of light reflection spot selected brokenly from multiple smooth reflection spot 12a is substituted by the size replacement light reflection spot 12b different from light reflection spot 12a.
Be set to 0.1% ~ 5% of the quantity of grid point by a part of light reflection spot selected brokenly from multiple smooth reflection spot 12a to the Replacement rate replacing light reflection spot 12b, be preferably set to 0.3% ~ 4%, be preferably set to 0.5% ~ 3% further.In addition, the diameter of multiple smooth reflection spot 12a is 10 ~ 100 μm, is preferably 20 ~ 90 μm, more preferably 30 ~ 80 μm.On the other hand, the diameter replacing light reflection spot 12b is 10 ~ 80 μm, is preferably 10 ~ 50 μm.By a part of light reflection spot being substituted by the light reflection spot of the diameter of 10 ~ 80 μm, brightness irregularities can be reduced.
Return Fig. 1 and Fig. 2, light source 3 is configured in a pair mutually opposing end face S3 1, S3 2side.Light source 3 can be the linear light sources such as cold-cathode fluorescence lamp (CCFL), but is preferably the point source of lights such as LED.In this case, as shown in Figure 2, such as form 2 limits mutually opposing in 4 limits of the back side S2 of rectangle along translucent resin sheet material 11, be arranged with multiple point source of light.When the light reflection spot 12 formed utilizing following jetted ink is with LED combination, be particularly conducive to the light obtaining nature tone.
As shown in Figure 1, transmission type image display part 30 is oppositely disposed in the outgoing plane S1 side of light guide plate 1 and light guide plate 1.Transmission type image display part 30 is such as having the liquid crystal display part of liquid crystal cells.
In above-mentioned formation, the light exported by light source 3 is by end face S3 1, S3 2be incident to light guide plate base 11.The light being incident to light guide plate base 11, by carrying out diffuse reflection at light reflection spot 12, mainly penetrates from outgoing plane S1.The light penetrated by outgoing plane S1 is supplied to transmission type image display part 30.Number and the configuration pattern of light reflection spot 12 is adjusted in the mode penetrating uniform planar light from outgoing plane S1 efficiently.
Then, the method for designing of the light distribution patterns of light guide plate 1 is described.
First, as shown in Figure 4, the back side S2 of such as light guide plate base 11 is divided into 7 × 9 region A 1,1~ A 7,9, to each region A m, nsetting covering rate (m is 1 ~ 7, n is 1 ~ 9).Specifically, covering rate is set in the mode penetrating uniform planar light from outgoing plane efficiently.In the present embodiment, by making the lower thickness of light guide plate base 11, covering rate is the regional A of less than 30% m, naccount for more than 50% of the back side S2 entirety of light guide plate base 11.Here, covering rate refers to the covering rate of light reflection spot 12a, that is, to the covering rate (covering rate setting operation) of the light reflection spot 12a replaced before light reflection spot 12b replacement.
Then, as shown in Figure 5, to each region A m, nsetting be used for light reflection spot printing target and by the grid point P of two-dimensional arrangements regularly.Specifically, the intersection point of the 1st straight line group L1 parallel to each other and the 2nd straight line group L2 parallel to each other is set to grid point P.Should illustrate, in Figure 5, the 1st straight line group L1 vertical with the 2nd straight line group L2 (grid point setting operation).
As shown in Figure 6 to 8, the 1st straight line group L1 and the 2nd straight line group L2 also can out of plumb.The intersecting angle θ of the 1st straight line group L1 and the 2nd straight line group L2 is 30 degree ~ 150 degree, is preferably 60 degree ~ 120 degree.By the intersecting angle θ of the 1st straight line group L1 and the 2nd straight line group L2 is set to 30 degree ~ 150 degree, can configure separated from one another for light reflection spot, and the light distribution patterns that can be formed by light reflection spot with higher covering rate printing.Its result, can improve the brightness of the injection light of planar light source device.
In addition, the distance between each straight line in the 1st straight line group L1 and the 2nd straight line group L2 is 40 μm ~ 200 μm, is preferably 50 μm ~ 180 μm, more preferably 60 μm ~ 120 μm.By the distance between each straight line is set to 40 μm ~ 200 μm, can configure separated from one another for light reflection spot, and the light distribution patterns that can be formed by light reflection spot with higher covering rate printing.Its result, can improve the brightness of the injection light of planar light source device.
Then, as shown in Figure 9, to each region A m, nthe quantity of the grid point P set by calculating.In the present embodiment, the quantity of grid point P is 5 × 5 (grid point calculation process).
Then, as shown in Figure 10, to each region A m, n, based on the covering rate of setting and the quantity of grid point P, in the mode of the covering rate of satisfied setting, be set in the size of light reflection spot 12a and the quantity of light reflection spot 12a that grid point P is formed.In the present embodiment, be little compared with the quantity of grid point P by the quantity set of light reflection spot 12a.In addition, the quantity of light reflection spot 12a can be set to identical with the quantity of grid point P.The size of light reflection spot 12a is determined by the dripping number of the ink in such as ink jet printing (light reflection spot sets operation).
Then, to each region A m, n, based on the size and number of the light reflection spot 12a set in light reflection spot setting operation, grid point P configures multiple smooth reflection spot 12a.In the present embodiment, with between brokenly except the mode of a part of light reflection spot in multiple smooth reflection spot 12a configures multiple smooth reflection spot 12a on grid point P.Between the scrambling removed such as use random number to decide (light reflection spot arrangement step).
Then, as shown in figure 11, to each region A m, nsetting replaces the size of light reflection spot 12b and replaces the quantity of light reflection spot 12b, and above-mentioned replacement light reflection spot is for replacing the part in the multiple smooth reflection spot 12a that configured, and size is different from light reflection spot 12a.In the present embodiment, the mode becoming 0.1% ~ 5% of the quantity of grid point P with the Replacement rate replacing light reflection spot 12b sets the quantity replacing light reflection spot 12b.Such as, when the quantity of grid point P is 12 × 12=144,
When the replacement number of replacement light reflection spot 12b is 1,1/144 × 100=about 0.69% (lower limit),
When the replacement number of replacement light reflection spot 12b is 7,7/144 × 100=about 4.86% (upper limit).
In addition, when the quantity of grid point P is 18 × 18=324,
When the replacement number of replacement light reflection spot 12b is 1,1/324 × 100=about 0.31% (lower limit),
When the replacement number of replacement light reflection spot 12b is 16,16/324 × 100=about 4.94% (upper limit).The size of light reflection spot 12b is such as determined (replace light reflection spot and set operation) by the number that drips of the ink in ink jet printing.
Then, to each region A m, n, based on the quantity (Replacement rate) of the replacement light reflection spot 12b of setting, from the multiple smooth reflection spot 12a of configuration, select a part of light reflection spot brokenly, and the replacement light reflection spot 12b of setting will be substituted by by a part of light reflection spot selected.The scrambling replaced such as uses random number to decide (light reflection spot replaces operation).
Then, the method manufacturing light guide plate 1 to using the light distribution patterns that designed by the method for designing of the light distribution patterns of this light guide plate 1 is described.
The manufacturing installation 200 of the light guide plate 1 shown in Figure 12 is formed by carrying the supply unit 40 of light guide plate base 11, ink jet head section 5, UV lamp 7 and testing fixture 9.Ink jet head section 5, UV lamp 7 and testing fixture 9 configure successively from upstream side at the moving direction A of light guide plate base 11.
Light guide plate base 11 utilizes conveying mechanism 40 to carry continuously or off and on along direction A.Light guide plate base 11 preferably utilizes the neutralizer (not shown) being configured in the upstream side of ink jet head section 5 except after electricity, is transported to ink jet head section 5.Except electricity normally with the carried charge of light guide plate base 11 be ± 300V within mode carry out.Light guide plate base 11 can meet the size of manufactured light guide plate and block in advance, also can form light reflection spot 12 in long light guide plate base 11, light guide plate base 11 be blocked thereafter.Conveying mechanism 40 in present embodiment is travelling table, but conveying mechanism is not limited thereto, and also can be such as belt conveyor, roller or air supporting transfer.
At the surperficial S0 of light guide plate base 11, utilize the ink jet head section 5 being supported on support portion 41 that the jetted ink point-like of droplet-like is carried out pattern printing.Now, pattern printing is that the jetted ink of the droplet-like dropping to surperficial S0 mode disconnected from each other is carried out.
Ink jet head section 5 be have on the whole Width (with the direction that A is vertical) being formed with the region of light reflection spot 12 of the surperficial S0 of light guide plate base 11 arrange opposedly with the surperficial S0 of light guide plate base 11 (back side S2) fixing 1 arrange or 2 arrange more than multiple nozzles.The ink of the droplet-like utilizing ink-jetting style to spray from these multiple nozzles is printed on the whole Width of light guide plate base 11 simultaneously together.The preferred light guide plate base 11 that makes is mobile while printing-ink continuously with certain speed.Or, the operation of printing-ink under the state stopping light guide plate base 11 and the operation that stops after making light guide plate base 11 move to next printing position are carried out repeatedly, also can with the pattern printing-ink be efficiently made up of the point of multiple row.
The translational speed of light guide plate base 11 carries out adjusting in the suitably mode of printing-ink.When present embodiment, as shown in figure 13, ink jet head section 5 is made up of multiple ink guns (unit) 5a ~ 5c respectively with multiple nozzle 51.These multiple ink gun 5a ~ 5c are arranged in the direction vertical with carrying the direction A of light guide plate base 11, link via fixed component 52 (with reference to Figure 12) in the mode of mutual end in throughput direction A overlap.
When present embodiment, can under the state of multiple nozzles of fixing ink jet head section 5, printing-ink together on the whole Width of light guide plate base 11.Thus, compared with the situation moving printing-ink successively with the Width making movable nozzle along light guide plate base 11, the throughput rate of light guide plate 1 improves tremendously.
In addition, according to ink-jet method, even such as maximum gauge is less than 100 μm such small light reflection spots 12, also can easily and correctly formed.When light guide plate base 11 is thin, light reflection spot 12 can be seen from outgoing plane S1 side through ground, but by reducing light reflection spot 12, this situation can be prevented.
The nozzle of ink jet head section 5 links via conduit 55 and inking unit 50.Inking unit 50 such as has the collecting print cartridge of ink and the pump for sending ink.Multiple conduit 55 can link with single print cartridge, also can link with multiple print cartridge respectively.
In order to form light reflection spot 12 can be the ink of the ultraviolet hardening containing pigment, optical polymerism composition and Photoepolymerizationinitiater initiater for the jetted ink of ink jet printing, also can be aqueous ink, solvent system ink etc.Should illustrate, jetted ink may not contain pigment.
Pigment be preferably in calcium carbonate particle, barium sulfate particles and TiO 2 particles at least any one.Calcium carbonate particle, barium sulfate particles and TiO 2 particles accumulation 50% particle diameter D50 is separately 50 ~ 3000nm, is more preferably 100 ~ 1500nm, more preferably 300 ~ 600nm.Accumulate the calcium carbonate particle in scope that 50% particle diameter D50 is 50 ~ 3000nm, barium sulfate particles, TiO 2 particles can by suitably selecting based on size-grade distribution to obtain from commercially available product.With the total quality of ink for benchmark, pigment is generally about 0.5 ~ 15.0 quality % containing proportional in ink.The ink that make use of the pigment of at least one in calcium carbonate particle, barium sulfate particles and TiO 2 particles is the ink that make use of inorganics.Consider the storage stability of the ink that make use of this inorganics, that is, during inorganic pigment precipitability, as ink, more preferably utilize calcium carbonate particle that in 3 kinds of particles, proportion is minimum as pigment.
The viscosity of the jetted ink 50 ± 10 DEG C time is preferably 5.0 ~ 15.0mPaS, is more preferably 8.0 ~ 12.0mPaS.The viscosity of jetted ink is such as by the weight-average molecular weight of aliphatic polyurethane (methyl) acrylate and/or containing proportional and adjust.If the weight-average molecular weight of aliphatic polyurethane (methyl) acrylate and large containing proportional change, then the viscosity that there is ink becomes large trend.
The surface tension of the jetted ink 25.0 DEG C time is preferably 25.0 ~ 45.0mJ/m 2, be more preferably 25.0 ~ 37.0mJ/m 2.The surface tension of jetted ink such as adjusts by the surfactants such as silicon system and fluorine system are matched with ink.
Printed ink is solidified in region 70 by the ultraviolet irradiated from the UV lamp 7 being supported on support portion 42.Time after printing-ink to irradiation ultraviolet radiation is generally 5 seconds ~ 120 seconds.Thus, the light reflection spot 12 be made up of the ink solidified is formed.
Thereafter, the operation of the state of the light reflection spot 12 formed through utilizing testing fixture 9 inspection being supported on support portion 43, can obtain light guide plate 1.Light guide plate 1 is truncated as required as required size.The testing fixture in the downstream being arranged at ink jet head section may not be utilized as in this embodiment to check light guide plate continuously, the testing fixture prepared in addition also can be utilized to check light guide plate with off-line mode.Or, also can omit the light guide plate inspection utilizing testing fixture to carry out.
Usually, the printed patterns of the ink of light reflection spot 12 to be become is designed so that uniform planar light efficiently from the pattern needed for outgoing plane S1 injection.In this case, the configuration pattern of multiple smooth reflection spot 12 becomes required pattern substantially, therefore can penetrate from light emergence face S1 the light being supplied to translucent resin sheet material 11 from light source 3 efficiently.Its result, can penetrate light with higher brightness from the light emergence face S1 of light guide plate 1.In addition, the configuration pattern due to light reflection spot 12 described above is required pattern, therefore, it is possible to from light emergence face S1 substantial uniform penetrate light.
Planar light source device 20 possesses light guide plate 1, therefore can with higher brightness injection light.In addition, transmission image display device 100 is with the optical illumination of the more high brightness penetrated from planar light source device 20, can the good image of the such display quality of more clear display comparison degree therefore, it is possible to demonstrate.
Here, as shown in figure 13, if arrange multiple ink gun (unit) 5a ~ 5c and print, then due to its installation accuracy and position Adjustment precision, cause the brightness irregularities (striped is uneven) producing wire at ink gun (unit) 5a ~ 5c linking portion C each other.
But, according to the light guide plate 1 of this present embodiment, the a part of light reflection spot selected brokenly from the multiple smooth reflection spot 12a of two-dimensional arrangements is regularly substituted by the size replacement light reflection spot different from light reflection spot 12a, therefore can reduces the brightness irregularities of the wire at ink gun (unit) 5a ~ 5c linking portion C each other.
In addition, light guide plate 1 according to the present embodiment, even if make light guide plate slimming and the diameter of reduction light reflection spot, also can reduce seeing of the contour line effect caused by the pattern of light reflection spot in the region that the covering rate of light reflection spot is low.Especially be as thin as 0.1mm ~ 1.0mm for the thickness of light guide plate base as the light guide plate for the mobile terminal such as notebook computer, tablet terminal and the little light guide plate of the diameter of light reflection spot, the effect seen reducing the contour line effect caused by the pattern of light reflection spot is large.In addition, the region that covering rate for the light reflection spot before replacing as the light guide plate for the mobile terminal such as notebook computer, tablet terminal is low to moderate less than 30% accounts for the light guide plate of more than 50%, and the effect seen reducing the contour line effect caused by the pattern of light reflection spot is large.
And if increase the Replacement rate of light reflection spot, then the change (gradual change) of covering rate becomes discontinuous sometimes, produce the brightness irregularities of local.But, light guide plate 1 according to the present embodiment, the Replacement rate of light reflection spot 12b is less 0.1% ~ 5%, therefore the generation of the brightness irregularities of local can be suppressed, and reduce the brightness irregularities of the wire in ink gun linking portion each other, in addition, seeing of the contour line effect that caused by the pattern of light reflection spot can be reduced.
In addition, if increase the Replacement rate of light reflection spot, then in the region that the covering rate of the light in part side such light distribution patterns close with light source is low, brightness significantly uneven.But, light guide plate 1 according to the present embodiment, the Replacement rate of light reflection spot 12b is less 0.1% ~ 5%, therefore the generation of the brightness irregularities of local can be suppressed, reduce the brightness irregularities of the wire in ink gun linking portion each other simultaneously, in addition, seeing of the contour line effect that caused by the pattern of light reflection spot can be reduced.
In addition, if relative to the size of multiple smooth reflection spot, the size differences replacing light reflection spot is very large, then the change (gradual change) of covering rate becomes discontinuous sometimes, produces the brightness irregularities of local.But, light guide plate 1 according to the present embodiment, the centre of the scope of the size that the size replacing light reflection spot 12b can obtain in the change (gradual change) of multiple smooth reflection spot 12a in covering rate, therefore the generation of the brightness irregularities of local can be suppressed, and reduce the brightness irregularities of the wire in ink gun linking portion each other, in addition, seeing of the contour line effect that caused by the pattern of light reflection spot can be reduced.
In addition, light guide plate 1 according to the present embodiment, except by a part of light reflection spot in the multiple smooth reflection spot 12a of two-dimensional arrangements regularly, therefore can reduce the brightness irregularities of the wire in ink gun linking portion each other further.
In addition, the present invention is not limited to above-mentioned present embodiment, can carry out various modification.Such as, light reflection spot in present embodiment replaces in operation, based on the quantity (Replacement rate) of the replacement light reflection spot 12b of setting, a part of light reflection spot is selected brokenly from the multiple smooth reflection spot 12a of configuration, the replacement light reflection spot 12b of setting will be substituted by by a part of light reflection spot selected, but also can replace in operation at light reflection spot, based on the quantity (Replacement rate) of the replacement light reflection spot of setting, from light reflection spot 12a light reflection spot arrangement step by between except grid point in select a part of grid point brokenly, a part of grid point of selecting also is being configured a part of the replacement light reflection spot 12b of setting.
This formation also can reduce the brightness irregularities of the wire in ink gun linking portion each other, in addition, can reduce seeing of the contour line effect caused by the pattern of light reflection spot.
In addition, in the present embodiment, the light reflection spot 12a alternatively, illustrates and has the light reflection spot with a kind of size, but also can have the light reflection spot 12a of two or more size with irregular being arranged in order.In this case, a part of these light reflection spots 12a is substituted by the size replacement light reflection spot 12b different from these light reflection spots 12a.
So, if there is the light reflection spot of two or more size with irregular being arranged in order, then can reduce the gray shade scale change caused by light reflection spot.Its result, in the low region of the covering rate of the light in part side such light distribution patterns close with light source, can reduce brightness irregularities.Especially utilize the hidden rate of multiple smooth reflection spot be less than 50% regional there is effect.
In addition, in the present embodiment shown with the example printing surface of the light distribution patterns in light guide plate base 11 being divided into 7 × 9 regions, but the printing surface of light guide plate base 11 can be divided into arbitrary M × N number of region A 1,1~ A m, N(M, N are the arbitrary integer of more than 2).
In addition, in the present embodiment shown with at regional A m, nin for printing the example that the grid point P of target is 5 × 5, but grid point P can be set as arbitrary quantity.
In addition, in the present embodiment exemplified with at end face S3 opposite one another 1, S3 2side configure the situation of light source 3 respectively.But light source 3 is configured at the side of at least one end face intersected with the light emergence face S1 of translucent resin sheet material 11 (or back side S2).
In addition, in the present embodiment exemplified with ink jet printing, but feature of the present invention also can be applied to laser printing etc. links the multiple head of arrangement and carry out all printings of printing.
[embodiment]
The light guide plate 1 of trial-production involved by embodiments of the present invention, as embodiment, carries out the comparative evaluation with the light guide plate of comparative example.The light guide plate of embodiment and comparative example is as described below.
(embodiment 1)
Prepare the PMMA resin sheet of 300mm × 200mm × 0.55mm as translucent resin sheet material, use uv-curing type ink jet ink to manufacture light guide plate.
Specifically, first, the back side S2 of light guide plate base 11 is divided into multiple region, covering rate is set to each region (1.014mm × 1.014mm).Then, will the printing target of light reflection spot be used for each region and be set as 12 × 12 (namely 144) by the grid point of two-dimensional arrangements regularly.Then, to size (diameter) and the quantity of each region setting covering rate, light reflection spot.Covering rate is the mode to penetrate uniform planar light efficiently from outgoing plane, be set to along with regional to light source away from, covering rate uprises.Should illustrate, in following evaluation, because light source is arranged in the long side direction of light guide plate, therefore the covering rate of regional gently uprises according to short side direction.In addition, the size (diameter) of light reflection spot is formed by 40 μm, 45 μm, 50 μm, 54 μm, 58 μm, 65 μm, and the sum of the light reflection spot in regional is set as 144.And then the mode that the regional being less than 30% with the covering rate of multiple smooth reflection spot accounts for 92% of at least one side of light guide plate base sets covering rate.Then, to each region, based on the size and number of light reflection spot, the configuration of the multiple smooth reflection spot in setting grid point, thus make fundamental design.
Then, each region is set to size and the Replacement rate (replacing the quantity of light reflection spot) of the size replacement light reflection spot different from multiple smooth reflection spot.Should illustrate, the diameter replacing light reflection spot is set to 35 μm, and Replacement rate was set to for 0.7% (replacing several 1: 1/144 × 100=about 0.7%).Then, based on Replacement rate, from the multiple smooth reflection spot be configured in grid point, select a part of light reflection spot brokenly, replace light reflection spot by being substituted by by a part of light reflection spot selected, thus obtain the light distribution patterns of Replacement rate 0.7%.
Then, masking film is peeled off from PMMA resin sheet, utilize uv-curing type ink jet ink by the light distribution patterns ink jet printing of gained in the face of peeling off.Then, to the jetted ink irradiation ultraviolet radiation of printing, ink photocuring is made.Its result, obtain being formed with Replacement rate 0.7% and light reflection spot by the light guide plate of the embodiment 1 of light distribution patterns replaced brokenly.
(embodiment 2)
Use the fundamental design made in embodiment 1, and the diameter replacing light reflection spot is set to 35 μm, Replacement rate be set to 2.1% (replacing several 3: 3/144 × 100=about 2.1%) and design and form light distribution patterns, in addition, the light guide plate of embodiment 2 is obtained similarly to Example 1.
(embodiment 3)
Use the fundamental design made in embodiment 1, and the diameter replacing light reflection spot is set to 35 μm, Replacement rate be set to 5.6% (replacing several 8: 1/144 × 100=about 5.6%) and design and form light distribution patterns, in addition, the light guide plate of embodiment 3 is obtained similarly to Example 1.
(embodiment 4)
In the fundamental design made in embodiment 1, the size (diameter) of light reflection spot is set to 35 μm, 45 μm, 50 μm, 54 μm, 58 μm, 65 μm, and the diameter replacing light reflection spot is set to 40 μm, Replacement rate be set to 0.7% (replacing several 1: 1/144 × 100=about 0.7%) and design and form light distribution patterns, in addition, the light guide plate of embodiment 4 is obtained similarly to Example 1.
(embodiment 5)
In the fundamental design made in embodiment 1, the size (diameter) of light reflection spot is set to 35 μm, 40 μm, 50 μm, 54 μm, 58 μm, 65 μm, and the diameter replacing light reflection spot is set to 45 μm, Replacement rate be set to 0.7% (replacing several 1: 1/144 × 100=about 0.7%) and design and form light distribution patterns, in addition, the light guide plate of embodiment 5 is obtained similarly to Example 1.
(embodiment 6)
The size (diameter) of light reflection spot in the fundamental design made in embodiment 1 is being set to 35 μm, 50 μm and be configured at brokenly in grid point, in addition, in the fundamental design made in embodiment 1,144 grid point all do not configure light reflection spot and be by a state removed, it is 40 μm to replace the diameter of light reflection spot, Replacement rate is that the mode of 4.9% (replacing several 7: 7/144 × 100=about 4.9%) is selected brokenly and replaces multiple grid point, design and form light distribution patterns, in addition, obtain the light guide plate of embodiment 6 similarly to Example 1.
(comparative example 1)
Use the fundamental design made in embodiment 1, do not carry out, to the replacement replacing light reflection spot, in addition, obtaining the light guide plate of comparative example 1 similarly to Example 1.
(comparative example 2)
Use the fundamental design made in embodiment 6, do not carry out, to the replacement replacing light reflection spot, in addition, obtaining the light guide plate of comparative example 2 similarly to Example 6.
In this evaluation, in using LED as the notebook computer of light source, be assembled into the light guide plate of embodiment 1 ~ 6 and comparative example 1 ~ 2 respectively.Then, open these notebook computers, only carry out visual valuation (without diffusion barrier) with the brightness disproportionation evenness of light guide plate to the brightness disproportionation evenness (striped is uneven) of wire, contour line effect, local.Then, diffusion barrier is made to be piled up in the light guide plate of embodiment 1 ~ 6 and comparative example 1 ~ 2, open these notebook computers, visual valuation (having diffusion barrier) is carried out to the brightness disproportionation evenness of the brightness disproportionation evenness (striped is uneven) of wire, contour line effect, local.These evaluation results are shown in table 1.
[table 1]
Here,
" ◎ " represents for light guide plate monomer, fails to see the level of the brightness disproportionation evenness (striped is uneven) of contour line effect, wire, the brightness disproportionation evenness of local,
"○" represent in light guide plate, to have the state of diffusion barrier under fail to see the level of the brightness disproportionation evenness (striped is uneven) of contour line effect, wire, the brightness disproportionation evenness of local,
Even if "×" represent in light guide plate, to have the state of diffusion barrier under also can see the level of the brightness disproportionation evenness (striped is uneven) of contour line effect, wire, the brightness disproportionation evenness of local.
Should illustrate, as long as " ◎ " and "○", be just permissible level (can be used as BLU to use).
According to this evaluation result, by the part in the multiple smooth reflection spot in light distribution patterns being substituted by the replacement light reflection spot of different size, the striped inequality (brightness irregularities of wire) in ink gun linking portion each other can be reduced, in addition, even if make light guide plate slimming and the diameter of reduction light reflection spot, also seeing of the contour line effect caused by the pattern of light reflection spot can be reduced in the region that the covering rate of light reflection spot is low.
In addition, known, when the Replacement rate of light reflection spot is less 0.1% ~ 5%, the brightness irregularities of the wire in ink gun linking portion each other can be reduced, in addition, while realize the problem seeing such the application reducing the contour line effect caused by the pattern of light reflection spot, the generation of the brightness irregularities of local also can be suppressed.
[symbol description]
1... light guide plate, 3 ... light source, 11 ... light guide plate base, 12 ... light reflection spot, 12a ... light reflection spot before replacement, 12b... replaces light reflection spot, and 20 ... planar light source device, 30 ... transmission type image display part, 100 ... transmission image display device (liquid crystal indicator), S0 ... surface (having carried out the one side of liquid-proof process), S1... outgoing plane, S2 ... the back side (having carried out the one side of liquid-proof process), S3 1~ S3 4end face, A 1,1~ A 7,9regional, grid point P.

Claims (19)

1. a light guide plate, is formed with light reflection spot at least one side of light guide plate base, wherein,
At least one side of described light guide plate base is being divided into the regional in multiple region, and two-dimensional arrangements has the grid point for printing target regularly, and this grid point is formed multiple smooth reflection spot,
In described regional, a part of light reflection spot be selected from brokenly in described multiple smooth reflection spot is substituted by the size replacement light reflection spot different from the plurality of smooth reflection spot.
2. light guide plate as claimed in claim 1, wherein, the Replacement rate of described replacement light reflection spot is 0.1% ~ 5% of the quantity of described grid point.
3. light guide plate as claimed in claim 1 or 2, wherein, in described regional, removes between a part of light reflection spot quilt in described multiple smooth reflection spot.
4. light guide plate as claimed in claim 3, wherein, in described regional, a part of light reflection spot in described multiple smooth reflection spot by between except grid point in a part of grid point on be configured with described replacement light reflection spot.
5. light guide plate as claimed in claim 1, wherein,
The diameter of described multiple smooth reflection spot is 10 μm ~ 100 μm,
The diameter of described replacement light reflection spot is 10 μm ~ 80 μm.
6. light guide plate as claimed in claim 1, wherein, the thickness of described light guide plate base is 0.1mm ~ 1.0mm.
7. light guide plate as claimed in claim 1, wherein, the covering rate of described multiple smooth reflection spot be less than 30% described regional account for more than 50% of at least one side of described light guide plate base.
8. a method for designing for light guide plate light distribution patterns, this light distribution patterns is made up of the light reflection spot of at least one side being formed on light guide plate base, wherein, comprises following operation:
Covering rate setting operation, is divided into multiple region by least one side of described light guide plate base, to each region setting covering rate be split to form;
Grid point setting operation, to the grid point of described each region setting for printing target, this grid point is by two-dimensional arrangements regularly;
Grid point calculation process, obtains the quantity of described grid point to described each region;
Light reflection spot setting operation, to described each region, based on the quantity of described covering rate and described grid point, to meet the mode of described covering rate, sets the size and number of the multiple smooth reflection spot formed in described grid point;
Light reflection spot arrangement step, to described each region, based on the size and number of the light reflection spot set in described smooth reflection spot setting operation, grid point configures multiple smooth reflection spot;
Replace light reflection spot setting operation, described each region setting is replaced to the size and number of light reflection spot, described replacement light reflection spot is for replacing the part in the multiple smooth reflection spot that configures in described smooth reflection spot arrangement step, and size is different from described multiple smooth reflection spot; And
Light reflection spot replaces operation, to described each region, based on the quantity of the replacement light reflection spot set in described replacement light reflection spot setting operation, from the multiple smooth reflection spot configured described smooth reflection spot arrangement step, select a part of light reflection spot brokenly, the replacement light reflection spot set in described replacement light reflection spot setting operation will be substituted by by a part of light reflection spot selected.
9. the method for designing of light guide plate light distribution patterns as claimed in claim 8, wherein, in described replacement light reflection spot setting operation, the mode being 0.1% ~ 5% of the quantity of described grid point with the Replacement rate of described replacement light reflection spot sets the quantity of described replacement light reflection spot.
10. the method for designing of light guide plate light distribution patterns as claimed in claim 8 or 9, wherein,
In described smooth reflection spot setting operation, be little compared with the quantity of described grid point by the quantity set of described multiple smooth reflection spot,
In described smooth reflection spot arrangement step, in grid point, configure multiple smooth reflection spot in a mode for a part of light reflection spot removed in described multiple smooth reflection spot.
The method for designing of 11. light guide plate light distribution patterns as claimed in claim 10, wherein,
Replace in operation at described smooth reflection spot, based on the quantity of the replacement light reflection spot set in described replacement light reflection spot setting operation, from a part of light reflection spot replaced at described smooth reflection spot multiple smooth reflection spot described in operation by between except grid point in select a part of grid point brokenly, a part of grid point of selecting also is being configured in a part for the replacement light reflection spot set in described replacement light reflection spot setting operation.
The method for designing of 12. 1 kinds of light guide plate light distribution patterns, it is the method for designing of light guide plate light distribution patterns according to claim 8, wherein, this light guide plate light distribution patterns by be formed on thickness be the described light guide plate base of 0.1mm ~ 1.0mm at least one side light reflection spot form.
The method for designing of 13. 1 kinds of light guide plate light distribution patterns, it is the method for designing of light guide plate light distribution patterns according to claim 8, wherein, this light guide plate light distribution patterns is made up of light reflection spot, this light reflection spot be formed on the covering rate of described multiple smooth reflection spots set in described covering rate setting operation be less than 30% described regional account at least one side of the described light guide plate base of more than 50%.
14. 1 kinds of light guide plate, possess the method for designing of light guide plate light distribution patterns according to claim 8 and the light distribution patterns designed.
The manufacture method of 15. 1 kinds of light guide plate, that at least one side using printing equipment to be manufactured on light guide plate base is formed with the method for the light guide plate of the light distribution patterns be made up of light reflection spot, described printing equipment possesses the unit being arranged with multiple printing position for carrying out printing of more than 2, and described unit is arranged in the orientation at described printing position, wherein
The method for designing of the light guide plate light distribution patterns described in claim 8 is utilized to design described light distribution patterns, and
While relative to unit described in described light guide plate base relative movement, utilize the printing position of described unit that described light distribution patterns is printed in described light guide plate base.
The manufacture method of 16. light guide plate as claimed in claim 15, wherein,
Described printing position is nozzle,
Described unit is the ink gun being arranged with multiple nozzle,
Described smooth reflection spot is light guide plate uv-curing type ink jet ink.
17. 1 kinds of light guide plate, are manufactured by the manufacture method of light guide plate according to claim 15.
The planar light source device of 18. 1 kinds of edge-light types, possesses:
The light guide plate described in any one in claim 1,14 and 17, and
To the light source of the side supply light of described light guide plate.
19. 1 kinds of transmission image display devices, possess:
Planar light source device according to claim 18, and
The transmission type image display part configured opposedly with the outgoing plane of described planar light source device.
CN201410514391.9A 2013-10-04 2014-09-29 Light guide plate and manufacturing method thereof, surface light source device, transmission type image display device, design method of grading pattern for light guide plate Pending CN104516050A (en)

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