CN106257316B - Composite pattern light guide plate and manufacturing method thereof - Google Patents
Composite pattern light guide plate and manufacturing method thereof Download PDFInfo
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- CN106257316B CN106257316B CN201510671175.XA CN201510671175A CN106257316B CN 106257316 B CN106257316 B CN 106257316B CN 201510671175 A CN201510671175 A CN 201510671175A CN 106257316 B CN106257316 B CN 106257316B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
Abstract
The invention relates to a composite pattern light guide plate and a manufacturing method thereof, comprising a light incident surface 10 for receiving light, a lower surface 20 connected with the light incident surface 10 and a light incident surface 30 facing the lower surface 20 and used for emitting light, wherein the lower surface comprises a plurality of first dots 210 and a plurality of second dots 220 and forms a dot pattern, and the diameter of the second dots is smaller than that of the first dots. The invention can improve the spot formation and improve the hot spot and light leakage phenomenon, thereby having the advantage of improving the uneven picture.
Description
Technical Field
The present invention relates to a composite pattern light guide plate and a method for manufacturing the same, and more particularly, to a composite pattern light guide plate and a method for manufacturing the same, which can improve a phenomenon of non-uniformity of a display screen occurring on a thin light guide plate.
Background
In general, a display device is a device that outputs an image based on an image signal. Among display devices, for example, a display device such as a Liquid Crystal Display (LCD) has a color plate for outputting RGB colors, and since the color plate itself is a non-light-emitting body, it is necessary to provide a backlight unit for irradiating light to the color plate to output an image.
A backlight unit (BLU) includes a light guide plate that uniformly disperses a light source generating light and light emitted from the light source over an entire area of a display device to illuminate the display device.
The light guide plate can be classified into an edge type (edge light type) and a direct light type (direct light type) according to the light incident mode.
The edge type is a mode in which a light source is provided on a side surface of a light guide plate, and the direct type is a mode in which a light source is provided at a lower portion of a light guide plate. The edge type is widely used compared to the direct type because of its simple manufacturing process, relatively light weight, and relatively low manufacturing and usage costs due to the use of fewer light sources.
The lower surface of the light guide plate is adhered with a reflecting film. The reflective film prevents light from leaking (light leakage) from the lower surface of the light guide plate, and allows a large amount of light to be emitted from the upper surface of the light guide plate.
The lower surface of the light guide plate is formed with a pattern for refracting light such that the light passing through the refraction is uniformly condensed thereon.
On the light guide plate, a pattern is printed using a laser-processed stamp, and the pattern is formed by transfer and injection.
However, as shown in fig. 1, a protrusion 201 is formed in a groove patterned on a lower surface of the light guide plate 1 so that a space is formed between the light guide plate 1 and the reflective film 4. If foreign matter such as dust flows between the light guide plate 1 and the reflection film 4, spots are generated on the light guide plate 1.
Recently, as the display is made lighter and thinner, the light guide plate tends to be thinner. As the thickness of the light guide plate is reduced, when the light guide plate is combined with the reflective film and other components (when external pressure is applied), as shown in fig. 2, the light guide plate 1 is easily deformed, and the light guide plate 1 and the reflective film 4 are brought into contact with each other, thereby causing spots and unevenness on the display screen.
Disclosure of Invention
The present invention provides a light guide plate with a composite pattern and a method for manufacturing the same, which can improve the uneven display screen and the spot phenomenon on a thin light guide plate even if the light guide plate is deformed by an external pressure by preventing the light guide plate and a reflective film from contacting each other.
Another object of the present invention is to provide a composite pattern light guide plate and a method for manufacturing the same, which can improve hot spots (hot spots) caused by surface roughness of a light incident surface, enhance brightness, and improve a phenomenon of non-uniformity of a screen.
In order to achieve the object of the present invention, the light guide plate of the present invention includes a light incident surface for receiving light; the lower surface is connected with the light incident surface; and a light-facing surface facing the lower surface and emitting light, wherein the lower surface includes a plurality of first dots and a plurality of second dots forming a dot pattern, and a diameter of the second dots is smaller than a diameter of the first dots.
In the invention, the first dot is composed of a first groove and a first protruding part, the first groove is formed by recessing the lower surface, the first protruding part is positioned in the first groove and protrudes out of the depth of the first groove, and the second dot is composed of a second protruding part protruding out of the lower surface.
In the present invention, starting from the lower face, the projection height H1 of the first projection is greater than the projection height H1 of the second projection.
In the present invention, the projection height H1 of the first projection is 1 μm to 6 μm and the projection height H1 of the second projection is 0.1 μm to 3 μm from the lower face.
In the present invention, the first dot is formed by a first groove formed by recessing the lower surface and a first protrusion portion positioned in the first groove and protruding higher than the depth of the first groove, the second dot is formed by a second groove formed by recessing the lower surface and a second protrusion portion positioned in the second groove and protruding higher than the depth of the second groove.
In the present invention, the depth H of the second groove is smaller than the depth H of the first groove.
In the present invention, the depth H of the first groove is 1 μm to 6 μm, and the depth H of the second groove is 0.1 μm to 3 μm.
In the present invention, the cross sections of the first groove and the second groove are circular, and the diameter D of the second groove is smaller than the diameter D of the first groove when viewed from the lower surface.
In the present invention, the cross-sections of the first grooves and the second grooves are circular, and the diameter D of the second grooves is smaller than the diameter D of the first grooves when viewed from the lower surface, and the difference is 10 to 90%.
In the present invention, the cross-sections of the first grooves and the second grooves are circular, and the diameter D of the first grooves is 25 μm to 100 μm and the diameter D of the second grooves is 15 μm to 90 μm when viewed from the lower surface.
In the invention, the surface roughness Ra of the light incident surface is 200nm-700 nm.
In the present invention, a V-CUT pattern or a dot pattern is formed on an optical surface.
In the invention, the V-CUT pattern or the dot pattern is formed on the light-facing surface away from the light-incident surface by a preset distance.
The invention provides a manufacturing method of a composite pattern light guide plate, which comprises a compression or injection molding step for processing a plurality of first round dots and a plurality of second round dots, wherein the first round dots are positioned on the lower surface of the light guide plate, and the diameter and the protruding height of the second round dots are smaller than those of the first round dots.
In the present invention, the light guide plate further includes a transcription step of forming a V-CUT pattern or a dot pattern on the light-facing surface of the emitted light.
In the invention, the V-CUT pattern or the dot pattern is formed on the light-facing surface away from the light-incident surface by a preset distance.
The invention prevents the contact between the light guide plate and the reflective film by forming a dot pattern having a plurality of two kinds of dots with different diameters, which can refract light, on the lower surface of the light guide plate, thereby improving the non-uniformity of the display screen on the thin light guide plate and having the effect of improving the dots.
In addition, the present invention can improve the effect of white spot phenomenon caused by dot overlapping by forming two kinds of dots having different diameters and depths on the lower surface of the light guide plate.
In addition, the invention improves the surface roughness of the light incident surface of the light guide plate and forms the V-CUT pattern on the light opposite surface which is at a preset distance from the light incident surface, thereby improving hot spots and enhancing brightness through the surface roughness of the light incident surface, and simultaneously improving the light leakage phenomenon, thereby achieving the effect of improving the problem of uneven pictures.
Drawings
Fig. 1 is a schematic view of a state in which a light guide plate and a reflective film are combined and the light guide plate is not under pressure.
Fig. 2 is a schematic view of a state in which the light guide plate and the reflective film are combined and the light guide plate is pressed.
Fig. 3 is a perspective view of a light guide plate according to a first embodiment of the present invention.
Fig. 4 is a sectional view of a light guide plate according to a first embodiment of the present invention.
Fig. 5 is a schematic view of a state in which the light guide plate and the reflective film are combined and the light guide plate is pressed according to the first embodiment of the present invention.
Fig. 6 is an enlarged cross-sectional view of a lower surface of a light guide plate according to a first embodiment of the present invention.
Fig. 7 is an enlarged cross-sectional view of a lower surface of a light guide plate according to a second embodiment of the present invention.
Fig. 8 is a schematic view illustrating a lower surface of a light guide plate according to a second embodiment of the present invention.
Fig. 9(a) is a schematic view showing the presence of a foreign substance between the light guide plate and the reflective film when the present invention is not used, and fig. 9(b) is a schematic view showing the presence of a foreign substance between the light guide plate and the reflective film when the present invention is used.
Fig. 10(a) is a schematic view showing unevenness of a display screen when the present invention is not used, and fig. 10(b) is a schematic view showing unevenness of a display screen when the present invention is used.
Fig. 11 is a schematic view illustrating a first dot according to a first embodiment of the present invention.
FIG. 12 is a schematic diagram illustrating dot overlap during processing according to the first embodiment of the present invention.
Fig. 13(a) is a schematic diagram of a white point where display dots overlap when the present invention is not used, and fig. 13(b) is a schematic diagram of a white point where display dots overlap when the present invention is used.
FIG. 14 is a schematic diagram illustrating the increase of roughness of the light incident surface to form a V-CUT pattern on the light incident surface according to the third embodiment of the present invention.
Fig. 15(a) is a schematic view showing the occurrence of a hot spot phenomenon when the present invention is not used, and fig. 15(b) is a schematic view showing the absence of a hot spot phenomenon when the present invention is used.
FIG. 16 is a schematic diagram of a sawtooth pattern on the light-in surface and a V-CUT pattern on the light-out surface for comparison with the third embodiment of the present invention.
FIG. 17 is a diagram of a fourth embodiment of the present invention for increasing roughness in an in-plane surface to form a V-CUT pattern at locations on an out-of-plane surface that are a predetermined distance from the in-plane surface.
FIG. 18 is a schematic diagram of increasing roughness in the light-in surface and forming a V-CUT pattern over the entire light-in surface for comparison with the fourth embodiment of the present invention.
Fig. 19 is a schematic diagram illustrating whether hot spots and light leakage can be improved within the range of the surface roughness of the light incident surface of the present invention.
The attached drawings indicate the following:
1: light guide plate 201: projecting part
10: light incident surface 20: lower surface
210: first dots 211: first groove
213: first projecting portion 220: second dot
221: second groove 223: second projecting part
30: light-facing surface 310: V-CUT Pattern
4: the reflection film 5: light source
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Before explaining the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may be deemed unnecessary or necessary to describe the subject matter of the present invention. The embodiments of the present invention are provided to explain the present invention to those skilled in the art to enable a more complete understanding of the present invention. Therefore, the shapes and dimensions of the constituent elements in the drawings may be exaggerated for clearer and clearer explanation.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 3, the light guide plate with composite pattern according to the present invention includes a light incident surface 10 on a side surface, a lower surface 20, and a light opposite surface 30 facing the lower surface 20.
The light guide plate 1 is for uniformly distributing light flowing from the light source 5 located on the side surface to a predetermined region.
The light incident surface 10 is an incident surface of light in the light guide plate 1. The light incident surface 10 is provided with a light source 5 for irradiating light to the inside of the light guide plate 1. A plurality of light sources 5 may be disposed at the light incident surface 10 at a predetermined interval. The light source 5 may use a Light Emitting Diode (LED), a Cold Cathode Fluorescent Lamp (CCFL), or the like.
The lower surface 20 is connected to the light incident surface 10. The lower surface 20 is adhered with a reflection film 4, and the reflection film 4 reflects light leaking from the lower surface 20 back into the light guide plate 1 again, thereby preventing light loss. The reflective film 4 is preferably a material having high reflectivity and good thermal properties to prevent contraction and expansion caused by heat generated from the light source 5.
The light-facing surface 30 is a surface for emitting light toward the lower surface 20.
As shown in fig. 4, the lower surface 20 of the light guide plate 1 forms a dot pattern.
The dot pattern of the lower surface 20 causes light to be reflected according to the dot pattern, and the light is adjusted to have uniform brightness over the entire surface of the light guide plate 1 by a certain amount.
The dot pattern may include a plurality of first dots 210 and a plurality of second dots 220 having a diameter smaller than that of the first dots 210.
In the edge type light guide plate, the first dots 210 formed on the lower surface 20 of the light guide plate 1 are mostly emitted at a position away from the light source 5, and thus, the light is less irradiated, and the density of the mountain pattern is gradually increased in a direction away from the light incident surface 10, but in the case of a thin light guide plate, the phenomenon of deformation as shown in fig. 2 is likely to occur when external pressure is applied, and thus, the display is likely to have a spot or uneven screen.
Therefore, as shown in fig. 5, if the first circular dots 210 and the second circular dots 220 having different diameters are formed on the lower surface 20 of the light guide plate 1, even if the light guide plate 1 is deformed by an external pressure, the lower surface 20 of the light guide plate 1 is prevented from being stuck to the reflective film 4, thereby preventing the occurrence of spots on the display screen and the occurrence of screen unevenness.
The dot pattern is processed on the lower surface 20 of the light guide plate 1 by compressing the light guide plate and injecting the light guide plate for forming, and if the first dots 210 and the second dots 220 overlap during the processing, white dots may be generated on the picture. In order to prevent white spots from occurring due to dot overlap, the first dots 210 and the second dots 220 processed on the lower face 20 may have different diameters and depths.
The first and second embodiments form the first and second dots 210 and 220 having different diameters and depths, and the first and second embodiments may be selectively employed.
As shown in fig. 6, as the first embodiment, the first dot 210 is formed by a first groove 211 formed to be upwardly recessed from the lower surface 20 and a first protrusion 213 formed to be downwardly protruded beyond the depth of the first groove 211 in the first groove 211, and the second dot 220 may be formed by a second protrusion 223 formed to be downwardly protruded from the lower surface 20.
As shown in the above, the top (a) of the first protrusion 213 is connected to the bottom (b) of the first groove 211, and thus, as shown in fig. 6, the sidewall of the first groove 211 is separated from the outer surface of the first protrusion 213 in a certain direction. The first and second protrusions 213 and 223 are preferably hemispherical or convex in shape.
The first dots 210 have a function of emitting light entering the light guide plate 1 from the light incident surface 10 to the light incident surface 30.
The second convex portions 223 are randomly distributed on the lower face 20, thereby preventing sticking of the lower face 20 and the reflection film 4. The cross section of the second projection 223 may be square, circular, quadrangular, triangular, etc.
The projection height H1 of the first projection 213 from the lower face 20 is greater than the projection height H1 of the second projection 223. After the first dots 210 formed by the first grooves 211 and the first protrusions 213 are processed, the second protrusions 223 are processed, and if the volume of the second protrusions 223 is smaller than that of the first protrusions 213, the second protrusions 223 do not affect the first dots 210 even if they overlap with each other, so that the white spot phenomenon can be prevented.
When the reflection film 4 is attached to the light guide plate 1, since the second protrusion 223 has a relatively smaller size than the first protrusion 213, relatively large dust cannot enter between the light guide plate and the reflection film, and the second protrusion 223 can reduce the possibility of mutual contact of the light guide plate 1 and the reflection film 4.
Here, the second protrusion 223 is compression-molded using the same material as the light guide plate 1, so that the occurrence of a spot phenomenon on the display can be prevented.
The projection height H1 of first projection 213 from lower face 20 is preferably 1 μm to 6 μm, and the projection height H1 of second projection 223 is preferably 0.1 μm to 3 μm. The experimental results show that the effect of preventing the white spot phenomenon and the picture non-uniformity phenomenon is significant when the protrusion height H1 of the first protrusion 213 is 1 μm to 6 μm and the protrusion height H1 of the second protrusion 223 is 0.1 μm to 3 μm.
As shown in fig. 7, as a second embodiment, the first dot 210 is constituted by a first groove 211 and a first protrusion 213, the first groove 211 is formed to be recessed upward from the lower face 20, and the first protrusion 213 is formed to be protruded downward within the first groove 211 beyond the depth of the first groove 211; the second dot 220 is formed of a second groove 221 and a second protrusion 223, the second groove 221 is formed to be upwardly recessed from the lower surface 20, and the second protrusion 223 is formed to be downwardly protruded beyond the depth of the second groove 221 in the second groove 211.
The top (a) of the first protrusion 213 and the bottom (b) of the first groove are connected to each other, and thus, as shown in fig. 7 and 8, the sidewall of the first groove 211 and the outer face of the first protrusion 213 have a certain interval.
Further, the top (e) of the second projection 223 and the bottom (f) of the second groove 221 are connected to each other, and thus, as shown in fig. 7 and 8, the sidewall of the second groove 221 and the outer face of the second projection 223 have a certain interval.
As in the second embodiment, the second dots 220 have a structure similar to that of the first dots 210, and the second dots 220, such as the first dots 210, have the function of emitting the light entering the light guide plate 1 from the light incident surface 10 to the light incident surface 30.
Here, the arrangement and density distribution of the first dots 210 are not important, and in order to prevent the display luminance non-uniformity, the second dots 220 should be designed to minimize the function of emitting the light entering the light incident surface 10 from the light incident surface 30.
For this reason, the depth H of the second groove 221 should be smaller than the depth H of the first groove 211, and the difference between the depth H of the second groove 221 and the depth H of the first groove 211 is preferably 20% or more. More preferably, the depth H of the first grooves 211 is 1 μm to 6 μm, and the depth H of the second grooves 221 is 0.1 μm to 3 μm.
When the cross sections of the first groove 211 and the second groove 221 are circular, in order to improve the brightness unevenness of the display, the diameter D of the second groove 221 in the lower surface 20 is preferably smaller than the diameter D of the first groove 211, and the difference between the diameter D of the second groove 221 in the lower surface 20 and the diameter D of the first groove 211 is preferably 20% or more.
Specifically, the volume of the second groove 221 is preferably smaller than the volume of the first groove 211, and the volume of the second projection 223 is preferably smaller than the volume of the first projection 213. If the volume of the second projection 223 is smaller than that of the first projection 213, the second projection 223 is received by the first projection 213 and the first groove 211 without affecting the first dot 210 even though they overlap each other, so that the white spot phenomenon can be prevented.
In the lower surface 20, when the diameter D of the first groove 211 is 25 μm-100 μm and the diameter D of the second groove 221 is 15 μm-90 μm, the effect of preventing the white spot phenomenon and the display brightness non-uniformity phenomenon is obvious.
As a third embodiment, in order to improve a hot spot (hotspot) phenomenon caused by surface roughness of the light incident surface 10, the light incident surface 10 may be roughened. For example, the formation of fine irregularities on the light incident surface can improve the hot spot phenomenon by diffracting light at the irregularities.
In the third embodiment, the first embodiment and the second embodiment may be selectively included.
In order to reduce power consumption and product price, when the light source 5 is reduced, the distance between the light source 5 and the light source 5 is increased, and in the light incident surface 10, the light-dark division between the bright portion, which is the region corresponding to the light source 5, and the dark portion, which is the region other than the bright portion, is very obvious, and a region brighter than the other portions is formed around the bright portion.
As described above, the phenomenon that the light incident surface 10 forms a bright dark portion and a luminance spot is formed in the vicinity of the incident light is called a hot spot, and the hot spot causes a picture unevenness phenomenon.
If the light incident surface 10 is formed as a rough surface or the entire light incident surface 10 is formed as a zigzag pattern, the light is incident at a wide angle due to an increase in the radiation angle of the light, and thus the hot spot phenomenon can be improved.
However, if a zigzag pattern is formed on the light incident surface 10 and a V-CUT pattern or a dot pattern is formed on the light incident surface 30 in order to improve the hot spot phenomenon, a phenomenon in which the screen is not uniform due to light cross occurs on the screen. Therefore, it is preferable that the zigzag pattern is not formed on the light incident surface 10.
As a fourth embodiment, the light incident surface 10 may be formed into a rough surface and a V-CUT pattern or a dot pattern in which peaks and valleys are repeated may be formed on the light incident surface 30.
The light-facing surface 30 preferably has a V-CUT pattern with a V-shaped valley bottom. The V-CUT pattern can function to change an emission angle of light emitted from the light guide 30 to enhance brightness.
If the light guide plate 1 is simultaneously formed with a dot pattern for changing a path so that the light incident on the lower surface 20 is not totally reflected, a V-CUT pattern 310 for enhancing the brightness by changing the emission angle of the light emitted to the light output surface 30, and a zigzag pattern for widening the emission angle of the light at the light input surface 10, bright lines occur due to light crossing at the front end of the light source 5, and thus, the screen is not uniform.
In order to prevent the above phenomenon, the light incident surface 10 does not use a zigzag pattern, but increases surface roughness, thereby preventing the occurrence of bright lines and hot spots. If the light incident surface 30 is not patterned, brightness will be reduced by merely increasing the roughness of the light incident surface 10 or by forming a zigzag pattern to remove hot spots.
The light incident surface 10 is not patterned, and has an effect of enhancing brightness only when the light surface 30 is patterned, and has an effect of blocking foreign substances because turbidity is increased when the light surface 30 is patterned.
In order to improve the hot spot, the roughness Ra of the surface of the light incident surface is 200nm-700 nm. When the surface roughness Ra of the light incident surface is in the range of 200nm-700nm, the radiation angle is increased when light emitted by a light source is incident on the light guide plate, and hot spots can be improved.
The V-CUT pattern 310 is preferably formed on the light-incident surface 30 at a predetermined interval from the light-incident surface 10.
The reason why the V-CUT pattern 310 is formed on the light-incident surface 30 at a predetermined distance from the light-incident surface 10 is that no hot spot occurs when the V-CUT pattern is formed on the entire surface of the light-incident surface 30, but light leakage occurs at the front end of the light source 5 to cause unevenness of a screen. Therefore, the V-CUT pattern is separated from the light incident surface 10 by a predetermined distance, and light leakage and hot spot phenomena occurring at the front end of the light source 5 can be improved.
The method for manufacturing the composite pattern light guide plate comprises a step of processing a first circular point 210 on the lower surface of the light guide plate in a compression molding mode, and a step of processing a second circular point 220 with a volume smaller than that of the first circular point 210 on the lower surface 20 of the light guide plate 1 processed with the first circular point 210 in a compression molding mode.
The light guide plate 1 may further include a transcription step of forming a V-CUT pattern or a dot pattern on the light-facing surface 30 from which light is emitted.
In addition to transcription, a V-CUT pattern or a dot pattern can be formed by etching with an etching solution, processing with a V-CUT processing device, or the like.
The V-CUT pattern or the dot pattern is preferably formed on the light incident surface 30 at a predetermined interval from the light incident surface 10 to ensure simultaneous improvement of hot spots and light leakage.
Preferably, the V-CUT pattern or the dot pattern is uniformly formed on the light incident surface 30 at a predetermined distance from the light incident surface 10.
Here, the V-CUT pattern or the dot pattern is preferably 0.2 to 5mm from the light incident surface 10, and the distance may be adjusted according to the entire area of the light guide plate 1.
The present invention will be described in more detail below with reference to fig. 9 to 19 by way of examples and comparative examples.
< first embodiment >
First and second dots having different diameters and depths are formed under the light guide plate.
The first dot 210 is formed of a first groove 211 formed to be upwardly recessed from the lower surface 20 and a first protrusion 213 formed to be downwardly protruded beyond the depth of the first groove 211 in the first groove 211, and the second dot 220 is formed of a second protrusion 223 formed to be downwardly protruded from the lower surface 20 and a second protrusion 223.
< first comparative example >
The dots are formed of first and second protrusions protruding from a lower surface of the light guide plate, the first and second protrusions having diameters of different lengths.
As shown in fig. 9(a), in the first comparative example, minute foreign substances between the light guide plate and the reflective film are displayed in the form of spots on the display. As shown in fig. 9(b), in the first embodiment, the minute foreign substances between the light guide plate and the reflective film are reduced in the number of displays, so that the spot phenomenon is improved.
As shown in fig. 10(a) and (b), comparing the first embodiment using the present invention with the first comparative example not using the present invention, the phenomenon of screen unevenness occurring on the display is improved.
Fig. 11 illustrates the first dot of the first embodiment to which the present invention relates, and the shapes of the first projection and the first groove of the first dot.
As shown in fig. 12, when the second convex portion is processed, a phenomenon in which the first convex portion and the second convex portion overlap occurs, and as shown in fig. 13(a), in the first comparative example, generally, white dots appear by dot overlapping, and as shown in fig. 13(b), in the first embodiment, white dots do not appear by dot overlapping.
That is, in the first embodiment, the first and second projections have different diameters and depths, and when the second projection is machined, the first projection can accommodate the second projection, and even if dots overlap, a white spot phenomenon does not occur.
< third embodiment >
As shown in fig. 14, the light incident surface 10 is not formed with a zigzag pattern, but only the surface roughness of the light incident surface 10 is increased, and a V-CUT pattern is formed over the entire light incident surface 30.
< second comparative example >
As shown in fig. 16, the light incident surface 10 is formed with a zigzag pattern, and the light incident surface 30 is formed with a V-CUT pattern over its entire surface.
Table 1 shows haze values measured depending on the presence or absence of a V-CUT pattern (upper pattern) on the light-receiving surface of the light guide plate.
[ TABLE 1 ]
According to Table 1, when a pattern is formed on the glossy surface, the effect of shielding foreign matter can be obtained due to the high haze.
In addition, as shown in fig. 14, in the third embodiment, no crossover phenomenon occurs, no hot spot occurs, and the picture is good.
As shown in fig. 15, (a) of fig. 15 shows that when the roughness of the surface of the light incident portion is less than 200nm, light emitted from the light source enters the light guide plate at a small incident angle, and a hot spot phenomenon occurs, resulting in non-uniformity of the screen. Fig. 15(b) shows that when the surface roughness of the light incident portion exceeds 200nm, the light emitted from the light source is incident on the light guide plate at a wider incident angle, and the hot spot phenomenon is improved.
As shown in fig. 16, in the second comparative example, due to the zigzag pattern of the light incident surface 10 and the V-CUT pattern 310 of the light incident surface 30, the light incident surface appears to intersect and the bright line phenomenon appears.
< fourth embodiment >
As shown in fig. 17, the light incident surface 10 has enhanced surface roughness, and V-CUT patterns are formed on the light incident surface 30 spaced apart from the light incident surface by a predetermined distance.
< third comparative example >
As shown in fig. 18, the light incident surface 10 has enhanced surface roughness, and V-CUT patterns are formed on the entire light incident surface 30.
Table 2 shows whether the hot spots and light leakage are improved over the range of surface roughness of the light-in surface.
As shown in fig. 17, when the V-CUT pattern 310 is formed on the light collimating section 30 at a predetermined distance from the light incident surface 10, no light leakage occurs at the front end of the light source 5, i.e., at the light incident section m.
As shown in fig. 18, when the V-CUT pattern 310 is formed on the light incident portion 30 without a distance from the light incident surface 10, light leakage occurs at the front end of the light source 5, that is, at the light incident portion n.
Table 2 shows whether hot spots and light leakage are improved over the range of surface roughness of the light-in surface.
[ TABLE 2 ]
As shown in Table 2 and FIG. 19, the surface roughness of the light incident surface is in the range of 200-700nm, and the hot spot and the light leakage phenomenon at the light incident part are improved.
As is apparent from the fourth embodiment and the third comparative example, the light incident surface is roughened to increase the surface roughness, thereby forming a V-CUT pattern on the light incident portion, thereby improving the hot spot phenomenon, and the light leakage phenomenon at the light incident portion is improved by forming the V-CUT pattern at a predetermined distance from the light incident portion, thereby improving both the hot spot and the light leakage phenomenon at the light incident portion.
From the above experimental results, it is known that the unevenness and the mottling of the display screen can be improved by forming a plurality of two kinds of dots having different diameters on the lower surface of the light guide plate.
In addition, by forming two kinds of dots having different diameters and depths on the lower surface of the light guide plate, a white spot phenomenon caused by overlapping of the dots can be improved.
In addition, by increasing the roughness of the light incident surface and forming patterns on the light incident surface at a predetermined interval from the light incident surface, hot spot phenomenon and light leakage phenomenon can be simultaneously improved, thereby improving picture unevenness.
As described above, the light guide plate according to the present invention is not limited to the specific example, and various modifications can be made without departing from the scope of the present invention, and the present invention also includes such modifications.
Claims (7)
1. A composite pattern light guide plate comprises
A light incident surface for receiving light;
the lower surface is connected with the light incident surface; and
a light-facing surface facing the lower surface and emitting light, characterized in that,
the lower face comprises a plurality of first dots and a plurality of second dots and forms a dot pattern, the diameter of the second dots is smaller than that of the first dots, at least one second dot is arranged between every two first dots,
the first dots are composed of first grooves and first convex parts, the first grooves are formed by concave lower surfaces, the first convex parts are positioned in the first grooves and are higher than the first grooves in depth to be convex, the second dots are composed of second convex parts convex from the lower surfaces,
starting from the lower face, the projection height H1 of the first projection is greater than the projection height H1 of the second projection,
the projection height H1 of the first projection is 1 μm to 6 μm, the projection height H1 of the second projection is 0.1 μm to 3 μm, taking the lower face as a starting point,
the first dot is composed of a first groove and a first convex part, the first groove is formed by concave of the lower surface, and the first convex part is positioned in the first groove and is higher than the depth of the first groove to be convex; the second dot is constituted by a second groove formed by recessing the lower surface and a second protrusion which is located in the second groove and protrudes higher than the depth of the second groove,
the depth H of the second groove is smaller than the depth H of the first groove,
the depth H of the first groove is 1-6 μm, and the depth H of the second groove is 0.1-3 μm.
2. The composite pattern light guide plate according to claim 1,
the cross-sections of the first groove and the second groove are circular, and the diameter D of the second groove is smaller than the diameter D of the first groove when viewed from the lower surface.
3. The composite pattern light guide plate according to claim 1,
the cross sections of the first groove and the second groove are circular, and the diameter D of the second groove is smaller than the diameter D of the first groove when viewed from the lower surface, and the difference is 10-90%.
4. The composite pattern light guide plate according to claim 1,
the cross sections of the first grooves and the second grooves are circular, the diameter D of the first grooves is 25-100 μm, and the diameter D of the second grooves is 15-90 μm.
5. The composite pattern light guide plate according to claim 1,
the surface roughness Ra of the light incident surface is 200nm-700 nm.
6. The composite pattern light guide plate according to claim 1,
the light-facing surface is formed with a V-CUT pattern or a dot pattern.
7. The composite pattern light guide plate according to claim 6,
the V-CUT pattern or the dot pattern is formed on the light-facing surface away from the light-incident surface by a preset distance.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2015-0087147 | 2015-06-19 | ||
| KR1020150087147A KR101608963B1 (en) | 2015-06-19 | 2015-06-19 | Light guide plate having complex pattern and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106257316A CN106257316A (en) | 2016-12-28 |
| CN106257316B true CN106257316B (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510671175.XA Active CN106257316B (en) | 2015-06-19 | 2015-10-16 | Composite pattern light guide plate and manufacturing method thereof |
| CN201520803975.8U Expired - Fee Related CN205139417U (en) | 2015-06-19 | 2015-10-16 | Compound pattern light guide plate |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520803975.8U Expired - Fee Related CN205139417U (en) | 2015-06-19 | 2015-10-16 | Compound pattern light guide plate |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR101608963B1 (en) |
| CN (2) | CN106257316B (en) |
| WO (1) | WO2016204340A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101608963B1 (en) * | 2015-06-19 | 2016-04-04 | (주)코이즈 | Light guide plate having complex pattern and method of manufacturing the same |
| WO2018178790A1 (en) * | 2017-03-31 | 2018-10-04 | 3M Innovative Properties Company | Lightguide |
| KR101865856B1 (en) * | 2017-04-28 | 2018-06-11 | (주)코이즈 | Light guide panel and method of manufacturing the same |
| CN109358389B (en) * | 2018-10-30 | 2024-03-22 | 东莞市谷麦光学科技有限公司 | Light guide assembly of mobile phone |
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| KR20130117587A (en) * | 2012-04-18 | 2013-10-28 | 김철영 | A fuel saving apparatus of vehicle |
| CN202583505U (en) * | 2012-05-28 | 2012-12-05 | 陈飞 | Light guide plate having multi-ring-type screen dot |
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2015
- 2015-06-19 KR KR1020150087147A patent/KR101608963B1/en active IP Right Grant
- 2015-08-27 WO PCT/KR2015/009017 patent/WO2016204340A1/en active Application Filing
- 2015-10-16 CN CN201510671175.XA patent/CN106257316B/en active Active
- 2015-10-16 CN CN201520803975.8U patent/CN205139417U/en not_active Expired - Fee Related
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| CN1387075A (en) * | 2001-05-22 | 2002-12-25 | 日亚化学工业株式会社 | Light guide plate of face luminous device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN205139417U (en) | 2016-04-06 |
| KR101608963B1 (en) | 2016-04-04 |
| WO2016204340A1 (en) | 2016-12-22 |
| CN106257316A (en) | 2016-12-28 |
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