KR101343118B1 - Light guide plate with variably arranged both sided pattern - Google Patents

Light guide plate with variably arranged both sided pattern Download PDF

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Publication number
KR101343118B1
KR101343118B1 KR1020120067307A KR20120067307A KR101343118B1 KR 101343118 B1 KR101343118 B1 KR 101343118B1 KR 1020120067307 A KR1020120067307 A KR 1020120067307A KR 20120067307 A KR20120067307 A KR 20120067307A KR 101343118 B1 KR101343118 B1 KR 101343118B1
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KR
South Korea
Prior art keywords
pattern
light guide
guide plate
pattern portion
variable
Prior art date
Application number
KR1020120067307A
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Korean (ko)
Inventor
엄기식
박성인
Original Assignee
주식회사 파인텍
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Priority to KR1020120067307A priority Critical patent/KR101343118B1/en
Application granted granted Critical
Publication of KR101343118B1 publication Critical patent/KR101343118B1/en

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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
    • 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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention provides a variably arranged both-sided pattern light guide panel including: a light guide panel; a polygonal pyramid- or a cone-shaped first pattern unit repetitively formed with a predetermined distance on the upper surface of the light guide panel; a hemisphere- or a dome-shaped second pattern unit repetitively formed with a predetermined distance on the bottom surface of the light guide panel, wherein the distance between the patterns of the first pattern units decreases as the horizontal distance from a side light source increases.

Description

Light Guide Plate with Variably Arranged Both Sided Pattern}

The present invention relates to a variable arrayed double-sided pattern light guide plate, and more particularly, to a variable-arranged double-sided pattern light guide plate having improved luminance and viewing characteristics.

Liquid crystal display device (LCD) is an electric element that converts and transmits the electrical information generated by the device to the visual information by using the change in the liquid crystal transmittance according to the applied voltage, the liquid crystal display device to other display devices Compared with the above-mentioned method, it is possible to reduce the weight, thickness and power consumption. Due to these characteristics, liquid crystal displays have been recently used in various display products such as TVs, monitors, navigation devices, mobile phones, and the like.

However, since the liquid crystal display device does not correspond to a self-luminous element, the display of the device depends on a backlight unit (BLU) located at the rear of the liquid crystal. The backlight unit is a unit that stably irradiates light on a display panel such as a liquid crystal display to express a display. The backlight unit generally includes a light source, a reflector, a light guide plate, a diffusion plate, a prism sheet, and other functional films. In particular, a light guide plate (LGP) is an essential component of a backlight unit for performing luminance and uniform illumination functions in a liquid crystal display device, and uniformly transmits light to the entire surface of a display device such as a liquid crystal display. It plays the role of plastic molding lens which plays a role.

Recently, as the competition for quality of liquid crystal display products is fierce, research on components having excellent brightness and visibility and thinning are being conducted. In particular, the light guide plate, which is the core component of the backlight unit, has a high overall brightness, excellent visibility characteristics, no moire, hot spots, and bright lines, and has a product characteristic capable of large area and thinness. Requires. Recently, research on patterned light guide plates for processing patterns on the light guide plate itself has been increasing instead of the conventional method of laminating various functional films on the light guide plate.

However, the conventional patterned light guide plate has a dot pattern and / or groove patterns or wave patterns formed on one or both surfaces of the light guide plate, and has excellent luminance as compared to general light guide plates. However, there is a problem that the overall luminance improvement rate is low, it is difficult to adjust the luminous sense, and the pattern design for improving the overall uniformity of the light guide plate is difficult.

Accordingly, the present inventors have led to the development of a variablely arranged double-sided pattern LGP having improved luminance and visibility, and easy pattern design and development.

SUMMARY OF THE INVENTION An object of the present invention is to provide a variablely arranged double-sided pattern light guide plate having improved luminance and viewing characteristics.

Another object of the present invention is to provide a variablely arranged double-sided pattern light guide plate that is easy to design and develop a pattern.

The above and other objects of the present invention can be achieved by the present invention described below.

Variablely arranged double-sided pattern light guide plate according to the present invention, the light guide plate; A first pattern portion having a polygonal pyramid or a cone shape repeatedly formed at a predetermined interval on an upper surface of the light guide plate; And a second pattern portion having a hemispherical shape or a dome shape repeatedly formed at predetermined intervals on a lower surface of the light guide plate, wherein the distance between the patterns of the first pattern portion decreases as the horizontal distance from the side light source increases. It is characterized by.

Here, the distance between the patterns of the second pattern portion decreases as the horizontal distance from the side light source increases.

The distance between the patterns is reduced in quadratic order as the horizontal distance from the side light source increases.

The light guide plate is characterized in that the wedge-shaped light guide plate.

The light guide plate is characterized in that the transparent plastic injection molding.

The light guide plate may be made of polycarbonate or poly methyl methacrylate.

The first pattern portion has a polygonal pyramid shape, and one vertex of the polygonal pyramid shape is disposed to face the side light source.

In the polygonal pyramid shape of the first pattern part, one side connecting a vertex in contact with an upper surface of the light guide plate and a vertex located at the top of the polygonal pyramid shape is horizontal to the direction of light emitted from the side light source. .

The first pattern portion is characterized in that the triangular pyramid shape.

The first pattern portion is characterized in that it is formed with a pattern height of 1 to 5㎛.

The first pattern portion is characterized in that it is formed with a pattern height of 2 to 3㎛.

The second pattern portion is characterized in that formed at a pattern height of 1 to 5㎛.

The second pattern portion is characterized in that formed at a pattern height of 3 to 4㎛.

The present invention has the effect of the invention to provide a variable-arranged double-sided pattern light guide plate having excellent brightness and luminous characteristics and easy pattern design and development.

1 is a side view schematically showing the appearance of a variable-arranged double-sided pattern light guide plate according to an embodiment of the present invention.
Figure 2 is a plan view schematically showing the appearance of a variable-arranged double-sided pattern light guide plate according to an embodiment of the present invention.
3 is an image of a portion of a first pattern portion of a variablely arranged double-sided pattern LGP according to the present invention;
4 is a graph showing a pattern distance of a first pattern portion and a second pattern portion with a Bezier curve with respect to the distance of the variablely arranged double-sided pattern LGP of the present invention.
Fig. 5A is luminance measurement data of a conventional pattern light guide plate in which dome pattern portions are continuously arranged at equal intervals on a lower surface of the light guide plate, and (B) is luminance measurement data of a variable-arranged double-sided pattern light guide plate of the present invention.

The above objects, features and other advantages of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings. Hereinafter, a variable-arranged double-sided pattern light guide plate according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side view schematically showing the appearance of a variable-arranged double-sided pattern light guide plate according to an embodiment of the present invention.

As shown in FIG. 1, the variable-arranged double-sided patterned light guide plate according to the present invention includes a light guide plate 10; It is comprised including the 1st pattern part 20 and the 2nd pattern part 30. FIG.

The light guide plate 10 is a transparent plastic injection molding that uniformly transmits the light emitted from the light source to the front surface of the display. Since the light guide plate 10 is used with respect to the side light source 40, the light guide plate 10 is preferably configured as a wedge type light guide plate. In order to reduce costs, it is desirable to manufacture a transparent plastic injection molding. In addition, the material of the LGP 10 is not particularly limited, but it is preferable to use polycarbonate (PC) or polymethyl methacrylate (PMMA) having excellent refractive index.

The first pattern portion 20 is formed on the upper surface of the light guide plate 10 repeatedly at predetermined intervals and has a polygonal or cone shape. The first pattern portion 20 has a horizontal distance from the side light source 40. The distance between the patterns of the first pattern portion 20 decreases as the number increases. Preferably, the first pattern portion 20 is preferably configured in the shape of a polygonal pyramid, most preferably in a triangular pyramid. For example, the first pattern portion 20 of the present invention may be configured in the shape of a polygonal pyramid such as a triangular pyramid, a square pyramid, a pentagonal pyramid, a hexagonal pyramid, or a cone. Therefore, as long as it does not depart from the spirit of the present invention, the minute design changes or the minute morphological differences with respect to the shape of the first pattern portion of the present invention will all be considered to be within the scope of the present invention.

The second pattern portion 30 has a hemisphere or dome shape that is repeatedly formed at a predetermined interval on the lower surface of the light guide plate 10, and the second pattern portion 30 increases as the horizontal distance from the side light source 40 increases. The distance between the patterns of the pattern portion 30 may be reduced. That is, the second pattern portion 30 is attached to the lower surface of the light guide plate 10 to reflect light traveling to the lower surface of the light guide plate 10 to the upper surface to prevent light loss.

The variable arrangement of the first pattern portion 20 and the second pattern portion 30 will be described later.

2 is a plan view schematically showing a state of a variablely arranged double-sided pattern LGP according to an exemplary embodiment of the present invention, and FIG. 3 is an image of a portion of the first pattern portion of the variable-arranged double-sided pattern LGP of the present invention. .

2 and 3, the first pattern portion 20 according to the present invention is formed on the upper surface of the light guide plate 10 and has a triangular pyramid shape. In this case, one vertex in the triangular pyramid shape is disposed to face the side light source 40. Preferably, the light emitted from the side light source 40 connecting one vertex in contact with the upper surface of the light guide plate 10 and the vertex located at the top of the triangular pyramid shape in the triangular pyramid shape of the first pattern portion 20. Place it horizontally with the direction of. In FIGS. 2 and 3, only the first pattern portion 20 having a triangular pyramid shape has been described. However, even when the shape of the first pattern portion 20 includes a polygonal pyramid such as a square pyramid and a pentagonal pyramid, in addition to the triangular pyramid, As long as the effects are not departed, the fine structure and the arrangement change of the first pattern portion are all considered to be within the scope of the present invention.

4 is a graph showing a pattern distance of a first pattern portion and a second pattern portion with a Bezier curve with respect to the distance of the variablely arranged double-sided pattern LGP of the present invention.

As shown in FIG. 4, the first pattern portion 20 and the second pattern portion 30 according to the present invention have a Bezier curve with respect to the pattern density according to the distance from the side light source 40. In other words, the pitch between the patterns decreases quadratically as the horizontal distance from the side light source 40 increases. That is, the horizontal distance between the patterns gradually decreases to 250 μm, 130 μm, 70 μm, 48 μm, and 45 μm from the light source adjacent to the light source 40 adjacent to the light source 40 from the side light source 40. As the horizontal distance between the pattern of the portion 20 and the second pattern portion 30 moves away from the side light source 40, the distance between the patterns decreases.

Pattern height of a 1st pattern part is 1-5 micrometers, Preferably it is 2-3 micrometers. When the pattern height of the first pattern portion is less than 1 µm or exceeds 5 µm, the luminance and luminous improvement effect due to the pattern is weak or a problem of uniformity decreases. Moreover, the pattern height of a 2nd pattern part shall be 1-5 micrometers, Preferably it is 3-4 micrometers. If the pattern height of the second pattern portion is less than 1 µm or exceeds 5 µm, it is difficult to expect brightness enhancement and poor uniformity occurs.

FIG. 5A shows luminance measurement data of a conventional pattern light guide plate in which dome-shaped pattern portions are continuously arranged at equal intervals on a lower surface of the light guide plate, and (B) is luminance measurement data of a variable-arranged double-sided pattern light guide plate of the present invention.

As shown in FIG. 5, the average brightness of the conventional pattern LGP having the domed pattern portion continuously arranged at the same interval on the lower surface of the LGP was measured to be about 1506 nit, but the first pattern portion that is variably arranged according to the present invention. And the average brightness of the double-sided pattern LGP having a second pattern portion is about 1614 nit, so that the variable-arranged double-sided pattern LGP B according to the present invention has a brightness improvement effect of about 7.17% over the conventional patterned LGP. It was investigated to have. In addition, the variable-arranged double-sided patterned light guide plate B of the present invention was measured to have better visibility and better uniformity than the conventional patterned light guide plate A.

The variable-arranged double-sided pattern LGP according to the present invention is arranged such that the horizontal distance between the patterns of the first pattern portion and / or the second pattern portion decreases away from the side light source to reduce the overall light loss formed inside the LGP or the pattern portion. By improving the brightness and luminous characteristics of the display, and since it is composed of a dot pattern, it is easy to design and change a pattern related to the quality of the display, and thus it can be usefully used as a part of the backlight unit.

Although the preferred embodiments of the present invention have been described, the present invention is not limited to the specific embodiments described above. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the appended claims. All equivalents should be regarded as falling within the scope of the present invention.

10: Light guide plate 20: First pattern portion
30: second pattern portion 40: light source

Claims (13)

A light guide plate;
A first pattern portion having a polygonal pyramid or a cone shape repeatedly formed at a predetermined interval on an upper surface of the light guide plate; And
A second pattern portion having a hemisphere or a dome shape repeatedly formed at a predetermined interval on a lower surface of the light guide plate;
Wherein the first pattern portion decreases the distance between the patterns of the first pattern portion as the horizontal distance increases from the side light source, and the distance between the patterns of the first pattern portion decreases quadratically as the horizontal distance increases from the side light source. A variable array double-sided pattern light guide plate, characterized in that. The method of claim 1, wherein the distance between the patterns of the second pattern portion decreases as the horizontal distance from the side light source increases, and the distance between the patterns of the second pattern portion is quadratic as the horizontal distance increases from the side light source. Variable arrayed double-sided pattern light guide plate, characterized in that the reduction. delete The variable array double-sided pattern LGP of claim 1 or 2, wherein the LGP is a wedge-shaped LGP. The variable array double-sided pattern light guide plate according to claim 1 or 2, wherein the light guide plate is a transparent plastic injection molding. The variable light guide plate of claim 1 or 2, wherein the light guide plate is made of polycarbonate or poly methyl methacrylate. The variable patterned double-sided pattern LGP of claim 1, wherein the first pattern portion has a polygonal pyramid shape, and one vertex of the polygonal pyramid shape is disposed to face a side light source. The method of claim 7, wherein one side of the first pattern portion that connects a vertex in contact with an upper surface of the light guide plate and a vertex located at an uppermost portion of the polygonal pyramid has a direction of light emitted from the side light source. A variable arrayed double-sided pattern light guide plate, characterized in that horizontal. The variable-arranged double-sided pattern LGP of claim 7 or 8, wherein the first pattern portion has a triangular pyramid shape. The variable-arranged double-sided pattern light guide plate of claim 1 or 2, wherein the first pattern portion is formed at a pattern height of 1 to 5 µm. The variable-arranged double-sided pattern LGP of claim 1 or 2, wherein the first pattern portion is formed at a pattern height of 2 to 3 µm. The variable patterned double-sided pattern LGP of claim 1, wherein the second pattern portion is formed at a pattern height of 1 to 5 μm. The variable-arranged double-sided pattern LGP of claim 1 or 2, wherein the second pattern portion is formed to have a pattern height of 3 to 4 µm.
KR1020120067307A 2012-06-22 2012-06-22 Light guide plate with variably arranged both sided pattern KR101343118B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170015623A (en) * 2015-07-29 2017-02-09 엘지디스플레이 주식회사 Light guide plate, backlight and moblie device comprising the same
CN106707616A (en) * 2016-12-23 2017-05-24 上海创功通讯技术有限公司 Backlight module and display device
US10234621B2 (en) 2015-08-27 2019-03-19 Samsung Display Co., Ltd. Display device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170015623A (en) * 2015-07-29 2017-02-09 엘지디스플레이 주식회사 Light guide plate, backlight and moblie device comprising the same
KR102378189B1 (en) * 2015-07-29 2022-03-24 엘지디스플레이 주식회사 Light guide plate, backlight and moblie device comprising the same
US10234621B2 (en) 2015-08-27 2019-03-19 Samsung Display Co., Ltd. Display device
CN106707616A (en) * 2016-12-23 2017-05-24 上海创功通讯技术有限公司 Backlight module and display device

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