CN105473933A - Light guide plate, planar light source device, and transmissive image display device - Google Patents
Light guide plate, planar light source device, and transmissive image display device Download PDFInfo
- Publication number
- CN105473933A CN105473933A CN201480046899.9A CN201480046899A CN105473933A CN 105473933 A CN105473933 A CN 105473933A CN 201480046899 A CN201480046899 A CN 201480046899A CN 105473933 A CN105473933 A CN 105473933A
- Authority
- CN
- China
- Prior art keywords
- light
- guide plate
- light guide
- scattering point
- light scattering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
-
- 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
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
Abstract
A light guide plate (24) according to one embodiment is provided with: a light guide plate substrate (30) for allowing light entering from an edge surface (30c) to be propagated therein; and a plurality of light-scattering dots (32) for scattering a portion of the light propagated through the light guide plate substrate, the plurality of light-scattering dots (32) being formed on a main surface (30a) of the light guide plate substrate. The percentage of light-scattering dots in which P12 is (D1/2 + D2/2) or less is 10% or less of the total number of light-scattering dots present in the group of light-scattering dots, where, among two adjacent light-scattering dots in a group of light-scattering dots formed in a prescribed region (34a) of the main surface, a first light-scattering dot (321) has a maximum width of (D1), a second light-scattering dot (322) has a maximum width of (D2), and the distance between centers of the first and second light-scattering dots is (P12). The prescribed region is a region, among a plurality of regions (34) formed by making imaginary divisions in the main surface, where the coverage rate by the group of light-scattering dots is 30% or less.
Description
Technical field
The present invention relates to light guide plate, planar light source device and transmission image display device.
Background technology
As transmission image display devices such as liquid crystal indicators, be known to have the device (with reference to patent document 1) utilizing light guide plate to supply the planar light source device (back lighting device) of the light of planar.In above-mentioned planar light source device, the end face along light guide plate is provided with light source.Such planar light source device is called as edge-light type planar light source device.
In edge-light type planar light source device, repeatedly carry out total reflection limit from the light of the surface feeding sputtering of light guide plate in the internal edges of light guide plate and propagate.In its communication process, a part for light is arranged at multiple light scattering point scattering in a face of light guide plate.What produced by this scattering penetrates from light guide plate with the light of angle more than critical angle to outgoing plane incidence.Like this, a part for the light propagated in light guide plate penetrates from outgoing plane, thus the light of planar is penetrated from light guide plate.
In order to make the brightness uniformity of the light emergence face of light guide plate, usually with more away from the configuration pattern that the coverage rate of light source, light scattering point is higher, form multiple light scattering point.
Patent document 1: Japanese Unexamined Patent Publication 2005-38768 publication
In recent years, further lightening along with image display device, requires slim light guide plate.In so slim light guide plate, there is the trend of the coverage rate step-down of light scattering point.Such as, compared with existing light guide plate, in slim light guide plate, there is the trend that the region of coverage rate below 40% is increased.Further, there is slim light guide plate to load in the situation in high-resolution image display device under smaller picture dimension.Example in high-resolution image display device under smaller picture dimension is the image display device that smart mobile phone or panel computer use.To be often user stare display from closer distance (such as, apart from display frame about 0.3m) to such image display device schemes like that using method.
Present inventor finds, there is the trend that the link each other of light scattering point becomes uneven and easily in sight in slim light guide plate.Present inventor especially finds, if slim light guide plate loads user from the image display device staring the such using method of picture nearby, then there is the trend that the link each other of light scattering point becomes uneven and easily in sight.
Summary of the invention
Main purpose of the present invention is to provide the link of light scattering point to become uneven and is difficult to light guide plate, planar light source device and the transmission image display device seen.
Light guide plate involved by a mode of the present invention possesses: light guide plate base, and it makes from the light of surface feeding sputtering at internal communication; And multiple light scattering point, its interarea being formed at light guide plate base that is the interarea intersected with end face, and make a part of scattering of the light propagated in light guide plate base.In the light scattering point group in regulation region being formed at interarea, in adjacent light scattering point, the diameter of the first light scattering point is set to D
1, the second light scattering point diameter be set to D
2, the distance between centers of the first light scattering point and the second light scattering point is set to P
12time, the whole light scattering point had relative to light scattering point group, the ratio of the light scattering point that meets formula (1) is below 10%.Regulation region is the region of coverage rate below 30% of the light scattering point group hypothetically split in multiple regions of interarea gained.
[formula 1]
P
12≤(D
1/2+D
2/2)...(1)
In said structure, be in the regulation region of less than 30% in the coverage rate of light scattering point group, owing to meeting the ratio of the light scattering point of formula (1) below 10%, so be difficult to the inequality of the link seen based on light scattering point.
The gross area in whole afore mentioned rules regions also can more than 90% relative to the effective area of interarea.
In this case, due to the effective area at interarea more than 90% time meet the ratio of the light scattering point of formula (1) below 10%, so be more difficult to the inequality of the link seen based on light scattering point.
The Breadth Maximum of the light scattering point that above-mentioned light scattering point group comprises also can in the scope of 30 μm ~ 100 μm.In this case, even if the Breadth Maximum of light scattering point is in the scope of 30 μm ~ 100 μm, also due in the coverage rate of light scattering point group be less than 30% regulation region in, meet the ratio of the light scattering point of formula (1) below 10%, so be difficult to the inequality of the link seen based on light scattering point.
The thickness of above-mentioned light guide plate base also can less than 1mm.
Even if the thickness of light guide plate base is less than 1mm, also due in the coverage rate of light scattering point group be less than 30% regulation region in meet the ratio of the light scattering point of formula (1) below 10%, so be difficult to the inequality of the link seen based on light scattering point.
The plan view shape of above-mentioned light guide plate base also can be rectangle.In this case, the length of the minor face under the plan view shape of light guide plate base also can at below 250mm.
Have plan view shape be rectangle and the length of its minor face be the light guide plate base of 250mm light guide plate such as easily load smart mobile phone and panel computer etc.There is the trend of user from close-ups display frame in smart mobile phone and panel computer etc.Even such situation, also due in the coverage rate of light scattering point group be less than 30% regulation region in meet the ratio of the light scattering point of formula (1) below 10%, so be difficult to the inequality of the link seen based on light scattering point.
Planar light source device involved by another way of the present invention possesses: the light guide plate involved by a mode of the present invention; And light source, the end face supply light of its light guide plate base had to light guide plate.
Transmission image display device involved by another mode of the present invention possesses: the light guide plate involved by a mode of the present invention; Light source, the end face supply light of its light guide plate base had to light guide plate; And transmission type image display part, it is penetrated by the illumination penetrated from light guide plate and shows image.
In above-mentioned planar light source device and transmission image display device, owing to possessing the light guide plate involved by a mode of the present invention, so be difficult to the inequality of the link seen based on light scattering point.
According to the present invention, the light guide plate, planar light source device and the transmission image display device that are difficult to see the link of scattering point and become uneven can be provided.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the schematic configuration of the transmission image display device represented involved by an embodiment.
Fig. 2 is the top view observing the situation of the light guide plate involved by an embodiment from a forming surface side.
Fig. 3 is the accompanying drawing be described an example of the configuration of light scattering point.
Fig. 4 is the accompanying drawing be described another example of the configuration of light scattering point.
Fig. 5 represents the size of the first and second light scattering point and the accompanying drawing of position relationship.
Detailed description of the invention
Below, with reference to accompanying drawing, embodiments of the present invention are described.The Reference numeral identical to identical element annotation.The repetitive description thereof will be omitted.The dimensional ratios of accompanying drawing may not with illustrate consistent.In explanation, represent " on ", the word in the direction such as D score is word easily based on state shown in the drawings.
Fig. 1 is the schematic diagram of the schematic configuration of the embodiment representing transmission image display device.Fig. 2 is the top view of the situation from the unilateral observation light guide plate being formed with the light scattering point that light guide plate has.In FIG, show the structure of transmission image display device 10 with decomposing.Transmission image display device 10 can suitably for smart mobile phone, panel computer and mobile notebook computer etc.The application of transmission image display device 10 is not limited to illustrated smart mobile phone and panel computer etc.Transmission image display device 10 also can be applied to mobile notebook computer in addition and television equipment etc.
Transmission image display device 10 shown in Fig. 1 mainly possesses: transmission type image display part 12; And export the planar light source device 14 of the light being used for the planar supplied to transmission type image display part 12.Also optics 16 can be configured between transmission type image display part 12 and planar light source device 14.The example of optics comprises the optical sheets such as reflective polarizing light separate sheet, light diffusing sheet, micro lens sheet, bi-convex lens sheet and prismatic lens.Only otherwise depart from purport of the present invention, just illustrated optical sheet can be configured singly or in combination.
Below, for convenience of explanation, as shown in Figure 1, the direction that transmission type image display part 12 and optics 16 arrange relative to planar light source device 14 is called Z-direction.The both direction orthogonal with Z-direction is called X-direction and Y direction.X-direction and Y direction mutually orthogonal.
Transmission type image display part 12 is by the optical illumination of planar that penetrates from planar light source device 14 thus display image.The example of transmission type image display part 12 is the display panels as Polarizer fitting body being configured with Polarizer 20,22 on the two sides of liquid crystal cell 18 respectively.In this case, transmission image display device 10 is liquid crystal indicator (or LCD TVs).As liquid crystal cell 18 and Polarizer 20,22, the liquid crystal cell that the transmission image display devices such as existing liquid crystal indicator can be used to use and Polarizer.The example of liquid crystal cell 18 is TFT (ThinFilmTransistor) type liquid crystal cells.As other examples of liquid crystal cell 18, also enumerate the liquid crystal cell etc. of STN (SuperTwistedNematic) type, TN (TwistedNematic) type, IPS (InPlaneSwitching) type, VA (VerticalAlignment) type.
Planar light source device 14 shown in Fig. 1 is the edge-light type planar light source devices supplying light to transmission type image display part 12.Planar light source device 14 possesses light guide plate 24 and is configured at the light source portion 26 of side of light guide plate 24.
Light source portion 26 has the multiple point source of light 26a being arranged as wire (along Y direction arrangement in Fig. 1).The example of point source of light 26a is light emitting diode.Light guide plate 24 is incident to efficiently in order to make light, light source portion 26 also can the upper and lower of light source portion 26 or according to circumstances and in the side contrary with light guide plate 24 side, possesses the light reflection that makes from light source portion 26 and the reflector as reflecting part for guiding to light guide plate 24.Here, the light source portion 26 with multiple point source of light 26a is illustrated.But light source portion 26 also can be the linear light sources such as cold-cathode tube (CCFL:ColdCathodeFluorescentLamp).
Planar light source device 14 also can possess the reflecting plate 28 being positioned at the side contrary with transmission type image display part 12 relative to light guide plate 24.Reflecting plate 28 is for making the light penetrated to reflecting plate 28 side from light guide plate 24 again to the parts of light guide plate 24 incidence.As shown in Figure 1, reflecting plate 28 also can be sheet.Reflecting plate 28 also can be the housing bottom surface to the planar light source device 14 that light guide plate 24 is accommodated.The reflecting surface of reflecting plate 28 can be the face of light being carried out to mirror-reflection, or also can be that limit makes light scattering and the face reflected it.
The light penetrated from light source portion 26 is converted to the light of planar and penetrates to transmission type image display part 12 by light guide plate 24.Light guide plate 24 has light guide plate base 30 and is arranged at multiple light scattering points 32 of light guide plate base 30.In Fig. 1 and Fig. 2, schematically illustrate light scattering point 32, its size and number may not be consistent with other figure.Light guide plate 24 utilizes light scattering point 32 to make from the incident light scattering of also being propagated in light guide plate base 30 by total reflection of light source portion 26, thus the light from light source portion 26 is converted to the light of planar and penetrates.The scattering of the light utilizing light scattering point 32 to carry out comprises diffuse reflection.
Light guide plate base 30 has: the interarea that is the some forming surface 30a that form a side of multiple light scattering point 32; Play interarea that is the outgoing plane 30b of the opposing party of function as the face of injection light in light guide plate 24; And four end faces 30c, 30d, 30e, 30f intersecting with a forming surface 30a and outgoing plane 30b.The example of the plan view shape of light guide plate base 30 comprises approximate rectangular and approximating square.In the following description, as long as do not particularly point out, then the plan view shape of light guide plate base 30 is approximate rectangular.In one embodiment, end face 30c, 30d, 30e, 30f is roughly orthogonal with some forming surface 30a and outgoing plane 30b like that as illustrated in Figure 1.End face 30c can be smooth face, also can be irregular of the formation of prism shape and lenticular shapes and so on.
Point forming surface 30a can be the face of general planar.Point forming surface 30a also can be the face being implemented lyophoby process.Outgoing plane 30b is the face of the side contrary with a forming surface 30a.Outgoing plane 30b is opposed with transmission type image display part 12 (or optics 16) in transmission image display device 10.Outgoing plane 30b can be tabular surface as in the present embodiment, but also can be the face with concaveconvex shape.As shown in Figure 2, end face 30c and end face 30d is positioned at mutually opposite side in the X-axis direction.End face 30c is opposed with light source portion 26.In this case, end face 30c is for the incidence surface from the light incidence of light source portion 26.End face 30e and end face 30f is positioned at mutually opposite side in the Y-axis direction.
Light guide plate base 30 is formed primarily of translucent material.As translucent material, be preferably poly-(methyl) acrylic acid alkyl resin sheet, polystyrene resin sheet or Merlon series resin sheet, among them, be preferably plexiglass sheet (PMMA resin sheet).Light guide plate base 30 also can comprise diffusion particle.When light guide plate base 30 is made up of translucent resin, light guide plate base 30 is translucent resin sheets.
In one embodiment, light guide plate base 30 can meet at least one in following (a) and (b).
A the thickness of () light guide plate base 30 is less than 1mm.
B the length of the minor face of () light guide plate base 30 is at below 250mm.
The thickness of light guide plate base 30 is usually at more than 0.3mm.The length of the minor face of light guide plate base 30 is usually at more than 50mm.
Fig. 2 ~ Fig. 4 is utilized to be described multiple light scattering point 32.Fig. 3 is the accompanying drawing for being described the configuration of light scattering point 32.Fig. 4 is the accompanying drawing for being described the relation of two adjacent light scattering points 32.
The example being formed at the plan view shape of the light scattering point 32 of a forming surface 30a is sub-circular.The ink that the materials'use of light scattering point 32 is light scattering.As the material of light scattering point 32, such as, use ultraviolet curable ink, water color ink or solvent type ink etc.Light scattering point 32 can be formed by ink jet printing method and silk screen print method etc.Also light scattering point 32 can be formed by the irradiation of laser rays.
As shown in the chain-dotted line in Fig. 3 and Fig. 4, when a forming surface 30a is divided into multiple imaginary area 34, multiple light scattering point 32 is to meet the mode of the coverage rate of setting in each imaginary area 34, in the upper formation of imaginary grid point (hereinafter referred to as imaginary grid point) for the formation of light scattering point 32.As shown in the dotted line in Fig. 2 ~ Fig. 4, imaginary grid point is the intersection point along first direction the first imaginary line L1 extended and the second imaginary line L2 extended along the second direction orthogonal relative to first direction.In Fig. 2 ~ Fig. 4, first direction is the direction parallel with minor face.Multiple first imaginary line L1 is parallel to each other.Similarly, multiple second imaginary line L2 is also parallel to each other.First imaginary line L1 and the second imaginary line L2 also can be non-orthogonal.The intersecting angle θ of the first imaginary line L1 and the second imaginary line L2 is 30 degree ~ 150 degree, is preferably 60 degree ~ 120 degree.
In Fig. 3 and Fig. 4, hypothetically a forming surface 30a is divided into 8 × 13.This Segmentation Number sets for convenience of explanation, and Segmentation Number is not limited to 8 × 13.As long as it is identical that the size of imaginary area 34 is set as making the quantity of the imaginary above-mentioned grid point in imaginary area 34, just there is no particular limitation.
In Fig. 3 and Fig. 4, show the example of whole of hypothetically cut-point forming surface 30a.But, as long as the some forming region of the formation light scattering point 32 in a forming surface 30a is divided into multiple imaginary area.Such as, exist, near the periphery of a forming surface 30a, the situation not forming the region of light scattering point 32 is set with constant width.When for such structure, the region of the some forming surface 30a outside the region removing above-mentioned constant width is the some forming region forming light scattering point 32.As above-mentioned constant width, such as, when the size of a forming surface 30a is 175mm × 300mm, being 3mm in incidence surface (being end face 30c in Fig. 2) side, is 1mm at other three avris.That is, when the size of a forming surface 30a is 175mm × 300mm, an example of the size of some forming region is 171mm × 298mm.Usually, the area putting forming region relative to the area of a forming surface 30a more than 95%.In the following description, for the purpose of simplifying the description, whole of a forming surface 30a is described as a forming region.
In imaginary area 34, the coverage rate of setting is the ratio of summation relative to the area of imaginary area 34 of the area (area of plan view shape) of the light scattering point 32 that this imaginary area 34 comprises.
Coverage rate is set to make the mode of brightness uniformity in outgoing plane 30b.Usually, light scattering point 32 is configured to along with away from light source portion 26, coverage rate uprises.Configuring in one side light inlet type of light source portion 26 relative to an end face (being end face 30c in Fig. 2), to make the mode that the coverage rate near the end face of the side contrary from the end face of light source portion 26 incidence with supplying light (for end face 30d Fig. 2) is higher, configuration light scattering point 32.
Light scattering point 32 can be formed in whole imaginary grid point as shown in FIG. 2 and 3, or also can not form light scattering point 32 in the imaginary grid point of a part as illustrated in fig. 4.As shown in FIG. 2 and 3, whole imaginary grid point is formed light scattering point 32, the distance between centers of light scattering point 32 adjacent on first and second direction is constant.On the other hand, as shown in Figure 4, when the imaginary grid point of a part does not form light scattering point 32, the distance between centers of light scattering point 32 adjacent on first and second direction respectively can be respectively first and second direction on the integral multiple at imaginary grid point interval.To penetrate the mode of uniform light from outgoing plane 30b, suitably select the distance between centers of the light scattering point 32 corresponding with the integral multiple at imaginary grid point interval.As long as configure light scattering point 32 in the mode penetrating uniform light from outgoing plane 30b, then such as the light scattering point 32 of a part also can configure from imaginary grid point with offseting slightly.
Whole imaginary grid point is formed light scattering point 32, coverage rate decides primarily of the size of the light scattering point 32 being formed at imaginary grid point.When whole formation light scattering point 32 not in the imaginary grid point in an imaginary area 34, namely when and compared with the situation that all imaginary grid point form light scattering point 32, light scattering point 32 is rejected at interval, mainly utilize the size of the quantity of the point of the light scattering in an imaginary area 34 32 and light scattering point 32 together to determine coverage rate.
At the thickness of light guide plate base 30 less than in the slim light guide plate 24 of 1mm, the coverage rate of imaginary area 34 usually can below 40%.At the thickness of light guide plate base 30 less than in the slim light guide plate 24 of 1mm, the region of the area of in the effective area of some forming surface 30a more than 90% can be the region of coverage rate below 30%.The effective area of some forming surface 30a refers to the area of aforementioned some forming region.In other words, the effective area of some forming surface 30a is the area in the region that the multiple light scattering points 32 be formed on a forming surface 30a configure, and it is corresponding with the summation of the area of multiple imaginary area.
Below, each imaginary area 34 of coverage rate in imaginary area 34 below 30% is called regulation region 34a.Regulation region 34a is such as each imaginary area 34 of the part having marked hatching in Fig. 3.The light scattering point 32 of the side in two light scattering points 32 adjacent in the light scattering point group of regulation region 34a is called the first light scattering point 32
1, the light scattering of the opposing party point 32 is called the second light scattering point 32
2.
Fig. 5 represents the first and second light scattering point 32
1, 32
2size and the accompanying drawing of position relationship.
In light guide plate 24, by the first light scattering point 32
1diameter (Breadth Maximum during top view light scattering point) be set to D
1, by the second light scattering point 32
2diameter (Breadth Maximum) be set to D
2, by the first and second light scattering point 32
1, 32
2distance between centers be set to P
12time, P
12meet the ratio of the light scattering point 32 of following formula (2) below 10%.In one embodiment, the example of the diameter of the light scattering point 32 in the 34a of regulation region can be 30 μm ~ 100 μm.
[formula 2]
P
12≤(D
1/2+D
2/2)…(2)
P
12the ratio meeting the light scattering point 32 of formula (2) refers to below 10%, and the quantity that will meet the light scattering point 32 of formula (2) specifies that divided by formation the percentages show of the numerical value of the quantity gained of whole light scattering point 32 of the light scattering point group of region 34a is below 10.When counting the quantity of the light scattering point 32 meeting formula (2), such as, relative to a first light scattering point 32
1in different directions (such as, first direction and second direction), upper existence meets the second adjacent light scattering point 32 of formula (2) respectively
2when, the above-mentioned first light scattering point 32 shared
1count is one.In other words, in two groups of light scattering points 32 adjoined, a light scattering point 32 is for identical, and the quantity meeting the light scattering point 32 of formula (2) is 3.
In light guide plate 24 under the above constitution, carry out total reflection limit from the light of end face 30c incidence in the internal edges of light guide plate base 30 and propagate.In the process of this propagation, incident to outgoing plane 30b under the condition different from total reflection condition by the light of light scattering point 32 scattering, therefore penetrate from outgoing plane 30b.A part for the light propagated in light guide plate base 30 penetrates from outgoing plane 30b, therefore penetrates the light of planar from outgoing plane 30b.
Be in the region of less than 30% at regulation region 34a and coverage rate, owing to meeting the ratio of the light scattering point 32 of formula (2) below 10%, so suppress the link of adjacent light scattering point 32,32.Therefore, such as, even if user is from nearby, (such as, within display frame 0.3m) stares the display frame of the transmission image display device 10 enclosing light guide plate 24, is also difficult to the inequality of the link seen based on light scattering point 32.
In one embodiment, the diameter of the light scattering point 32 in the 34a of regulation region is 30 μm ~ 100 μm.Even such mode, also owing to meeting the ratio of the light scattering point 32 of formula (2) in the 34a of regulation region below 10%, so be difficult to the inequality of the link seen based on light scattering point 32.
In one embodiment, light guide plate 24 is that the thickness of light guide plate base 30 is less than 1mm, less than 0.8mm or the slim light guide plate such less than 0.5mm.Even such mode, be also difficult to the inequality of the link seen based on light scattering point 32.
In one embodiment, whole areas (gross area in whole regulation regions) shared by the 34a of regulation region a forming surface 30a effective area more than 90%.In such mode, due to the effective area at a forming surface 30a more than 90% time meet the ratio of the light scattering point 32 of formula (2) below 10%, so be difficult to the inequality of the link seen based on light scattering point 32 further.
For the light guide plate 24 loaded in the transmission image display device such as smart mobile phone and panel computer, under most cases, the length of minor face is at below 250mm, even at below 200mm.Further, the user of smart mobile phone and panel computer etc. has the trend of staring display frame on hand.Even such situation, as long as the ratio meeting the light scattering point 32 of formula (2) in the 34a of regulation region is below 10%, the inequality of the link based on light scattering point 32 just can be reduced.
In one embodiment, the shape of light guide plate base 30 meets at least one party of above-mentioned (a) and (b), and whole areas shared by the 34a of regulation region a forming surface 30a effective area more than 90%.Even such mode, also owing to meeting the ratio of the light scattering point 32 of formula (2) below 10%, so be more difficult to the inequality of the link seen based on light scattering point 32.
In one embodiment, the regulation region 34a of coverage rate below 20% in multiple regulation region 34a is present in a forming surface 30a.In such mode, even if the summation of the area of the regulation region 34a of coverage rate below 20% be effective area 85%, be even 90%, also owing to meeting the ratio of the light scattering point 32 of formula (2) below 10%, so reduce the inequality based on the link of light scattering point 32.
In one embodiment, the regulation region 34a of coverage rate below 10% in multiple regulation region 34a is present in a forming surface 30a.In such mode, even if the summation of the area of the regulation region 34a of coverage rate below 10% be effective area 50%, be even 60%, also owing to meeting the ratio of the light scattering point 32 of formula (2) below 10%, so reduce the inequality based on the link of light scattering point 32.
In other words, coverage rate in multiple regulation region 34a is present in a some forming surface 30a below 20% with the regulation region 34a of at least one of less than 10%, the structure meeting the light guide plate 24 of ratio below 10% of the light scattering point 32 of formula (2) in the 34a of regulation region is more effective.
Above, embodiments of the present invention are illustrated, but the present invention is not limited to above-mentioned embodiment, various change can be carried out in the scope of purport not departing from invention.
In the above-described embodiment, light scattering point 32 is configured in imaginary grid point.But such as, at least one light scattering point 32 also can be formed from imaginary grid point skew.For light guide plate 24, also can from end face 30d incident light except end face 30c.Or, three end faces that also can have from light guide plate 24 or four surface feeding sputtering light.Light enters shooting method such as can be decided by the application planar light source device of light guide plate 24 or the size of transmission image display device and using method thereof towards light guide plate 24.
In light guide plate 24, also can be formed with light scattering point 32 at outgoing plane 30b.Be formed at the configuration of the light scattering point 32 of outgoing plane 30b the condition that meets be formed at the some forming surface 30a shown in Fig. 1 light scattering point 32 configuration the condition that meets identical.The light scattering point 32 being formed at outgoing plane 30b such as also can make light transmission and carries out diffuse reflection to it thus make light scattering in limit.When outgoing plane 30b forms light scattering point 32, can not form light scattering point 32 in the face of the side contrary with outgoing plane 30b yet.
The plan view shape of light scattering point 32 is not limited to circle, also can be ellipse, triangle and quadrangle.When the shape of light scattering point 32 is oval, Breadth Maximum is the length on long limit, when the shape of light scattering point 32 be triangle and quadrangle, Breadth Maximum is the length on the limit grown most.As long as the center position of centre of gravity such as of light scattering point 32.
Mainly make the plan view shape of light guide plate base 30 be that rectangle is illustrated, but as mentioned above, the plan view shape of light guide plate base 30 also can be square.In this case, even if such as at below 250mm, also owing to meeting the ratio of the light scattering point 32 of formula (2) below 10%, so be more difficult to the inequality of the link seen based on light scattering point 32.
The explanation of Reference numeral
10 ... transmission image display device; 12 ... transmission type image display part; 14 ... planar light source device; 24 ... light guide plate; 26 ... light source portion; 30 ... light guide plate base; 30a ... point forming surface (interarea); 30c ... end face; 32 ... light scattering point; 34 ... imaginary area; 34a ... regulation region; 32
1first light scattering point; 32
2second light scattering point.
Claims (7)
1. a light guide plate, is characterized in that, possesses:
Light guide plate base, it makes from the light of surface feeding sputtering at internal communication; And
Multiple light scattering point, its interarea being formed at described light guide plate base that is the described interarea intersected with described end face, and make a part of scattering of the described light propagated in described light guide plate base,
In the light scattering point group being formed at the regulation region in described interarea, in two adjacent light scattering points, the Breadth Maximum during top view of the first light scattering point is set to D
1, the second light scattering point top view time Breadth Maximum be set to D
2, described first light scattering point and described second light scattering point distance between centers be set to P
12time, the whole light scattering point had relative to described light scattering point group, the ratio of the light scattering point that meets formula (1) below 10%,
Described regulation region is the region of coverage rate below 30% of the described light scattering point group hypothetically split in multiple regions of described interarea gained,
P
12≤(D
1/2+D
2/2)···(1)。
2. light guide plate according to claim 1, is characterized in that,
The gross area in whole described regulation regions relative to the effective area of described interarea more than 90%.
3. light guide plate according to claim 1 and 2, is characterized in that,
The Breadth Maximum of the light scattering point that described light scattering point group comprises is in the scope of 30 μm ~ 100 μm.
4. the light guide plate according to any one of claims 1 to 3, is characterized in that,
The thickness of described light guide plate base is less than 1mm.
5. the light guide plate according to any one of Claims 1 to 4, is characterized in that,
The plan view shape of described light guide plate base is rectangle,
The length of the minor face under the described plan view shape of described light guide plate base is at below 250mm.
6. a planar light source device, is characterized in that, possesses:
Light guide plate according to any one of Claims 1 to 5; And
Light source, the described end face supply light of its described light guide plate base had to described light guide plate.
7. a transmission image display device, is characterized in that, possesses:
Light guide plate according to any one of Claims 1 to 5;
Light source, the described end face supply light of its described light guide plate base had to described light guide plate; And
Transmission type image display part, it is penetrated by the illumination penetrated from described light guide plate and shows image.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-179234 | 2013-08-30 | ||
| JP2013179234A JP2015049968A (en) | 2013-08-30 | 2013-08-30 | Light guide plate |
| PCT/JP2014/069109 WO2015029639A1 (en) | 2013-08-30 | 2014-07-17 | Light guide plate, planar light source device, and transmissive image display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105473933A true CN105473933A (en) | 2016-04-06 |
Family
ID=52586214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480046899.9A Pending CN105473933A (en) | 2013-08-30 | 2014-07-17 | Light guide plate, planar light source device, and transmissive image display device |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP2015049968A (en) |
| KR (1) | KR20160048873A (en) |
| CN (1) | CN105473933A (en) |
| TW (1) | TW201514561A (en) |
| WO (1) | WO2015029639A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112083601A (en) * | 2019-06-12 | 2020-12-15 | 三星显示有限公司 | Backlight unit and display apparatus having the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9739927B2 (en) * | 2013-05-28 | 2017-08-22 | Sakai Display Products Corporation | Light source device and display apparatus |
| CN107407465B (en) * | 2015-04-01 | 2019-04-05 | 夏普株式会社 | Lighting device, display device and radiovisor |
| JP2017204435A (en) * | 2016-05-13 | 2017-11-16 | 株式会社小糸製作所 | Lighting fixture and vehicular lighting fixture |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11183731A (en) * | 1997-12-18 | 1999-07-09 | Nissha Printing Co Ltd | Surface light emitting device |
| JP2002231031A (en) * | 2001-02-06 | 2002-08-16 | Enplas Corp | Flat light source device, image display device and light guide plate |
| CN101356233A (en) * | 2006-01-06 | 2009-01-28 | 三菱工程塑料株式会社 | Aromatic polycarbonate resin composition for lightguide plate, and lightguide plate |
| JP2012059645A (en) * | 2010-09-10 | 2012-03-22 | Fujikura Ltd | Planar light-emitting device and lighting module |
| CN102565919A (en) * | 2010-12-28 | 2012-07-11 | 住友化学株式会社 | Light guide plate, surface light source device, and transmission image display device |
| CN102628975A (en) * | 2011-02-02 | 2012-08-08 | 住友化学株式会社 | Light guide plate, surface light source device, transmission-type image display device, method of manufacturing light guide plate, and ultraviolet curing type ink-jet ink for light guide plate |
| CN103091764A (en) * | 2011-10-28 | 2013-05-08 | 住友化学株式会社 | Light guide plate and method of manufacturing light guide plate, surface light source apparatus and transmission type image display apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012160378A (en) * | 2011-02-01 | 2012-08-23 | Sumitomo Chemical Co Ltd | Method for producing light guide plate |
-
2013
- 2013-08-30 JP JP2013179234A patent/JP2015049968A/en active Pending
-
2014
- 2014-07-17 WO PCT/JP2014/069109 patent/WO2015029639A1/en active Application Filing
- 2014-07-17 CN CN201480046899.9A patent/CN105473933A/en active Pending
- 2014-07-17 KR KR1020167007813A patent/KR20160048873A/en not_active Application Discontinuation
- 2014-08-18 TW TW103128336A patent/TW201514561A/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11183731A (en) * | 1997-12-18 | 1999-07-09 | Nissha Printing Co Ltd | Surface light emitting device |
| JP2002231031A (en) * | 2001-02-06 | 2002-08-16 | Enplas Corp | Flat light source device, image display device and light guide plate |
| CN101356233A (en) * | 2006-01-06 | 2009-01-28 | 三菱工程塑料株式会社 | Aromatic polycarbonate resin composition for lightguide plate, and lightguide plate |
| JP2012059645A (en) * | 2010-09-10 | 2012-03-22 | Fujikura Ltd | Planar light-emitting device and lighting module |
| CN102565919A (en) * | 2010-12-28 | 2012-07-11 | 住友化学株式会社 | Light guide plate, surface light source device, and transmission image display device |
| CN102628975A (en) * | 2011-02-02 | 2012-08-08 | 住友化学株式会社 | Light guide plate, surface light source device, transmission-type image display device, method of manufacturing light guide plate, and ultraviolet curing type ink-jet ink for light guide plate |
| CN103091764A (en) * | 2011-10-28 | 2013-05-08 | 住友化学株式会社 | Light guide plate and method of manufacturing light guide plate, surface light source apparatus and transmission type image display apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112083601A (en) * | 2019-06-12 | 2020-12-15 | 三星显示有限公司 | Backlight unit and display apparatus having the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015049968A (en) | 2015-03-16 |
| TW201514561A (en) | 2015-04-16 |
| WO2015029639A1 (en) | 2015-03-05 |
| KR20160048873A (en) | 2016-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100754400B1 (en) | Backlight unit and display device employing the same | |
| US7568827B2 (en) | Light guide member and backlight unit including light guide member | |
| US7635200B2 (en) | Planar light source device and display using the same | |
| US9703032B2 (en) | Planar light source | |
| TWI317433B (en) | Light guide plate and back-lighted module having light guide plate | |
| US8287172B2 (en) | Planar illumination device | |
| CN102287679A (en) | Light source module and backlight module | |
| CN105319641A (en) | Light guide plate, method for fabricating same, backlight unit, and liquid crystal display | |
| EP3358379A1 (en) | Optical element, light guide plate, prism, backlight unit and display apparatus | |
| JP2013206834A (en) | Illumination unit using light guide body, and display device having the same | |
| CN103901528A (en) | Surface light source device and its light guide plate | |
| CN105473933A (en) | Light guide plate, planar light source device, and transmissive image display device | |
| JP2014186913A (en) | Lighting unit and display device | |
| WO2008099989A1 (en) | Backlight unit | |
| CN103782082A (en) | Light guide plate, surface light source device, and transmissive image display device | |
| CN103822139A (en) | Backlight source module and display device | |
| CN103900033A (en) | Light guide plate and backlight module | |
| CN103105695A (en) | Liquid crystal panel assembly and image display apparatus having the same | |
| JP2012079460A (en) | Lighting unit using concealment lens sheet and display device equipped with this | |
| CN101452086A (en) | Prismatic lens, back light module unit and LCD device | |
| US20130148054A1 (en) | Light guide plate as well as backlight module and liquid crystal display device including the same | |
| JP4984512B2 (en) | Surface light emitting device and liquid crystal display device | |
| KR101173131B1 (en) | Back light unit having unified optical sheet | |
| CN104235637B (en) | Area source | |
| KR20140062323A (en) | Light guide panel and liquid display apparatus using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160406 |