KR20150027355A - Light Guiding Plate having LED array and Backlight unit including the Same - Google Patents

Light Guiding Plate having LED array and Backlight unit including the Same Download PDF

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Publication number
KR20150027355A
KR20150027355A KR20130104262A KR20130104262A KR20150027355A KR 20150027355 A KR20150027355 A KR 20150027355A KR 20130104262 A KR20130104262 A KR 20130104262A KR 20130104262 A KR20130104262 A KR 20130104262A KR 20150027355 A KR20150027355 A KR 20150027355A
Authority
KR
South Korea
Prior art keywords
light
guide plate
light guide
led package
light emitting
Prior art date
Application number
KR20130104262A
Other languages
Korean (ko)
Inventor
오주석
Original Assignee
희성전자 주식회사
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 희성전자 주식회사 filed Critical 희성전자 주식회사
Priority to KR20130104262A priority Critical patent/KR20150027355A/en
Publication of KR20150027355A publication Critical patent/KR20150027355A/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—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
    • 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
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • 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
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/125—Bends, branchings or intersections
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side-type backlight device having a structure for eliminating light leakage by eliminating a gap between a light source and a light guide plate. A plurality of LED packages are mounted on a substrate and a light emitting portion is integrally joined to the light guiding portion so that the light emitting surface of the LED package faces the light guiding portion at at least one side of the light guiding portion.
According to the present invention, the light guide plate and the LED package are integrally formed without a gap, thereby preventing damage to the LED package due to thermal expansion of the light guide plate and change of optical characteristics, It is possible to improve the light efficiency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate having a light source and a backlight unit having the light guide plate,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device, and more particularly, to a side-view backlight device having a structure for preventing leakage of light by eliminating a gap between a light source and a light guide plate.

Background Art [0002] A backlight device is an illumination device for realizing an image of a display device such as a liquid crystal display device. Recently, a light emitting diode (LED) has been spotlighted as a light source of a backlight device. Such a backlight device is classified into a direct lighting type or an edge lighting type backlight device according to the position of a light source. The direct-type backlight device illuminates light directly on a liquid crystal panel through an optical sheet in a lower light source. In a side-type backlight device, a light source is disposed on a side of a light guide plate, and indirectly illuminates light through a light guide plate and an optical sheet. .

FIG. 1 is an exploded perspective view showing a main structure of a conventional side-type backlight device, and FIG. 2 is an enlarged cross-sectional view illustrating a detailed structure of a light source part of the backlight device of FIG.

As shown in these figures, in the side-type backlight device, the LED array 20 is disposed on one side of the light guide plate 10, and the diffusion sheet 30 and the prism sheet 40 are stacked on the upper side of the light guide plate 10 . Here, the light guide plate 10 has a rectangular plate shape. In the LED array 20, a plurality of LED packages 22 are mounted at regular intervals on a substrate 21 on which a predetermined circuit is printed. In such a side-view backlight device, the light of a plurality of point light sources emitted from the LED array 20 enters the light guide plate 10 through the light entrance surface 10a and is totally reflected within the light guide plate 10, And is emitted upward.

On the other hand, when light passes through the light guide plate 10, heat is generated by light, and the light guide plate 10 made of a transparent resin material expands due to heat. The thermal expansion of the light guide plate 10 causes contact between the LED package 22 and the light incident surface 10a of the light guide plate 10 to damage the LED package 22 or to change the light characteristics incident on the light guide plate 10 . In order to prevent this, a side clearance backlight device is essentially provided with a predetermined clearance D between the LED package 22 and the light guide plate 10 in consideration of thermal expansion.

However, in the side-type backlight device having the above-described structure, it is possible to prevent damage to the LED package due to thermal expansion of the light guide plate and deterioration of optical characteristics, There is a disadvantage in that light leaks at an interval D between the light emitting portions 10a. That is, the light emitted from the LED package has a predetermined directivity angle, and most of the light is incident into the light guide plate, but a part of light emitted at the upward or downward directional angle can not be incident on the light guide plate, do. Therefore, in the conventional side-type backlight device, there is a problem that light efficiency is lowered due to light loss between the LED package and the light guide plate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a light guide plate and a backlight unit which are integrated with a light source and prevent damage to an LED package due to thermal expansion of a light guide plate and changes in optical characteristics.

Another object of the present invention is to provide a light guide plate and a backlight unit of a light source integrated type capable of improving light efficiency by eliminating a gap between a light source and a light guide plate to prevent light loss.

According to an aspect of the present invention, there is provided a light guide plate comprising: a light guide portion of a transparent resin;

A plurality of LED packages are mounted on a substrate and a light emitting portion is integrally joined to the light guiding portion so that the light emitting surface of the LED package faces the light guiding portion at at least one side of the light guiding portion.

Here, the light guiding part is bonded to the light emitting part to seal the LED package.

In addition, the side-view backlight device of the present invention includes the light guide plate having the above-described structure; And an optical sheet laminated on the upper side of the light guide plate.

According to the present invention, the light guide plate and the LED package are integrally formed without a gap, thereby preventing damage to the LED package due to thermal expansion of the light guide plate and change of optical characteristics, It is possible to improve the light efficiency.

1 is an exploded perspective view showing a main structure of a side-view backlight device according to a conventional technique,
FIG. 2 is an enlarged cross-sectional view showing a detailed structure of a light source part for the backlight device of FIG. 1,
3 is an exploded perspective view showing a main configuration of a side-type backlight device according to an embodiment of the present invention, and Fig.
4 is an enlarged cross-sectional view illustrating the light source structure of the backlight device of FIG. 3 in detail.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is an exploded perspective view illustrating a main configuration of a side-type backlight device according to an embodiment of the present invention, and FIG. 4 is an enlarged cross-sectional view illustrating a light source structure of the backlight device of FIG.

As shown in these figures, the backlight device of the present invention includes a light guide plate 100 integrally provided with a light source on one side, a diffusion sheet 200 and a prism sheet 300 disposed on the upper side of the light guide plate 100 . The light guide plate 100, the diffusion sheet 200, and the prism sheet 300 are sequentially placed on a cover bottom (not shown), and are stably fixed by a guide panel (not shown) fastened to the cover bottom from above the cover bottom . Further, a reflective sheet (not shown) may be further disposed under the light guide plate 100.

Specifically, the light guide plate 100 has a structure in which light sources are integrally joined to one side. That is, the light guide plate 100 of the present invention is composed of the light guide unit 110 and the light emitting unit 120 provided on one side of the light guide unit 110. The light guide unit 110 and the light emitting unit 120 are transparent And is integrally molded through a resin injection process.

Here, the light guiding unit 110 converts the light of a plurality of point light sources incident from the light emitting unit 120 into total light through the total internal reflection, and emits the light to the upper side. The light guiding portion 110 may be made of a transparent acrylic resin having a square plate shape, for example, by injection molding using a PMMA resin. In addition, a light pattern may be formed on the upper surface or the lower surface of the light guiding portion 110 to scatter light totally reflected therein and to control an outgoing angle of light emitted to the upper surface.

The light emitting unit 120 is bonded to one side of the light guide unit 110 and allows light from a plurality of point light sources to enter the light guide unit 110. The light emitting unit 120 is configured in the form of an array in which a plurality of LED packages 122 are mounted on the substrate 121 at regular intervals. The substrate 121 has a predetermined width and length, and a circuit pattern for driving the LED package 122 is printed. The LED package 122 is a light source of the backlight device and emits light to the window region of the side surface to allow light to be incident into the light guiding portion 110. The LED package 122 may have a light emitting surface of a side view type or a top view type.

4, the light guiding unit 110 and the light emitting unit 120 are arranged such that the light emitting surface 122a of the LED package 122 and the light incident surface 110a of the light guiding unit 110 are bonded to each other Structure. The LED package 122 of the light emitting unit 120 may be embedded in the light guiding unit 110 while being embedded in the light guiding unit 110 so that the upper and lower ends of the light guiding unit 110 completely cover the LED package 122 110).

The diffusion sheet 200 diffuses the light emitted from the light guide plate 100 to make the brightness uniform, and the prism sheet 300 condenses the light that has passed through the diffusion sheet 200 to have high brightness. The diffusion sheet 200 and the prism sheet 300 are optical members for improving the optical characteristics of the backlight device. In the present invention, the diffusion sheet and the prism sheet are exemplified as the optical members. However, the diffusion sheet and the prism sheet may be composed of optical members having various functions such as a brightness enhancement film or a pair of prism patterns having vertical and horizontal prism patterns.

2) is formed between the light emitting surface 122a of the LED package 122 that is the light emitting portion 120 and the light incident surface 110a of the light guiding portion 110 in the backlight device having the above structure The light emitted from the light emitting surface 122a of the LED package 122 is incident into the light guiding portion 110 through the light incident surface 110a without leakage. Generally, when a distance of 0.1 mm is formed between the light emitting surface of the LED package and the light incident surface of the light guide plate, light loss of about 1.25% is caused. In the present invention, however, And can exhibit 100% light efficiency in the incident area.

The LGP-integrated light guide plate according to the embodiment of the present invention can be manufactured by an insert molding process using a metal mold.

More specifically, in a separate process, a light emitting portion 120 having a plurality of LED packages 122 mounted on a substrate 121 is prepared and prepared, and at the same time, a cavity having a predetermined thickness Prepare a mold apparatus. Then, the light emitting unit 120 manufactured in advance is fixed in the cavity of the mold apparatus. At this time, the light emitting portion 120 is disposed at one side edge in the cavity, and the light emitting surface of the LED package 122 should be directed toward the center of the space.

In addition, a liquid transparent resin is injected into the space in the cavity where the light emitting portion 120 is fixed, thereby forming a molded article of the light guiding portion. At this time, the transparent resin press-fitted into the cavity of the cavity is brought into contact with one side of the light emitting part 120, and in particular, a plurality of LED packages 122 are enclosed and sealed. After the transparent resin is completely filled in the cavity, it is cured and cooled for a predetermined period of time. After the transparent resin is completely cured, the light emitting portion 120 and the light guide portion 110 are integrally molded The light guide plate 100 is taken out.

The light source integrated light guide plate of the present invention can be easily manufactured by an insert injection process using a mold apparatus as described above. Light emitted from the LED package provided on one side is directly incident into the light guide plate without loss , It can exhibit high light efficiency in the incident light region.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100: light guide plate
110: light guiding unit 120:
121: substrate 122: LED package
200: diffusion sheet
300: prism sheet

Claims (3)

A light guide portion of a transparent resin;
And a light emitting portion integrally connected to the light guiding portion such that a light emitting surface of the LED package is directed to the inside of the light guiding portion at at least one side of the light guiding portion, wherein a plurality of LED packages are mounted on the substrate, . The light-emitting device according to claim 1,
And the light emitting part is bonded to the light emitting part to seal the LED package. A light guide plate according to claim 1 or 2; And
And an optical sheet laminated on the light guide plate.
KR20130104262A 2013-08-30 2013-08-30 Light Guiding Plate having LED array and Backlight unit including the Same KR20150027355A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR20130104262A KR20150027355A (en) 2013-08-30 2013-08-30 Light Guiding Plate having LED array and Backlight unit including the Same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR20130104262A KR20150027355A (en) 2013-08-30 2013-08-30 Light Guiding Plate having LED array and Backlight unit including the Same

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KR20150027355A true KR20150027355A (en) 2015-03-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170019018A (en) * 2015-08-10 2017-02-21 삼성디스플레이 주식회사 Display device and fabrication method of the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170019018A (en) * 2015-08-10 2017-02-21 삼성디스플레이 주식회사 Display device and fabrication method of the same

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