KR20080112478A - Light unit and manufacturing method of light unit - Google Patents

Light unit and manufacturing method of light unit Download PDF

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Publication number
KR20080112478A
KR20080112478A KR1020070060918A KR20070060918A KR20080112478A KR 20080112478 A KR20080112478 A KR 20080112478A KR 1020070060918 A KR1020070060918 A KR 1020070060918A KR 20070060918 A KR20070060918 A KR 20070060918A KR 20080112478 A KR20080112478 A KR 20080112478A
Authority
KR
South Korea
Prior art keywords
light
housing
light guide
light source
guide plate
Prior art date
Application number
KR1020070060918A
Other languages
Korean (ko)
Inventor
박동욱
Original Assignee
엘지이노텍 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 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020070060918A priority Critical patent/KR20080112478A/en
Publication of KR20080112478A publication Critical patent/KR20080112478A/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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • 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)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

A lighting unit and a method for manufacturing the same provided to maximize the lighting efficiency, and prevent loss of photon during the transmission path. A light unit(100) is located on a receiving space which has one opening. A housing(110) has a light guide pattern(112) on the bottom of the housing. A light source(115) is mounted at the bottom of the receiving surface. A circuit pattern(114) is formed on the bottom of the light source receiving space. A casting light guide plate(117) is molded on the light guide pattern.

Description

Light unit and manufacturing method of light unit

1 is a side cross-sectional view schematically showing the components of a typical light unit.

Figure 2 is a side cross-sectional view schematically showing the components of the light unit according to an embodiment of the present invention.

3 is a flowchart illustrating a method of manufacturing a light unit according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

100: light unit 110: housing

112: light guide pattern 114: circuit pattern

115: light source 116: through hole

117: molding LGP 118: diffusion sheet

119: prism sheet

The present invention relates to a light unit.

Cathode ray tube (CRT), which is one of the display devices that are generally used, is mainly used for monitors such as televisions, measuring devices, information terminal devices, etc., but due to its own weight and size, It could not actively respond to the demand for miniaturization and weight reduction.

In order to replace the cathode ray tube, it has advantages such as small size, light weight and low power consumption, and liquid crystal display devices for displaying information by using the electrical and optical properties of the liquid crystal injected into the liquid crystal panel have been actively developed. Recently, it plays a role as a flat panel display device.

In general, a liquid crystal display includes a liquid crystal panel in which a liquid crystal material is injected between two glass substrates, and a backlight unit for supplying light to the liquid crystal panel.

1 is a side cross-sectional view schematically showing the components of a general light unit 10.

According to FIG. 1, the PCB 16 is positioned at one side of the bottom cover 11 of the general light unit 10, and a reflector sheet 13 is attached to the remaining area.

The PCB 16 mounts a light source 17 such as a CCFL or LED to supply power and transmit a driving signal.

A light guide panel (LGP) 15 is coupled to the reflection plate 13 and to the side of the light source 17, and the light guide plate 15 is formed by emitting a predetermined pattern 15a on a bottom surface thereof, or by printing. The light emitted from the light source 17 is uniformly irradiated upward.

The reflector cover reflects light emitted from the light source 17 in the direction of the light guide plate 15, and a diffuser sheet 18 and a prism sheet 19 are disposed on the light guide plate 15. Combined in turn.

In the case of such a general light unit 10, minute spacing easily occurs below the light guide plate pattern 15a, and due to the material property of the reflector 13, deformation is likely to occur during manufacturing or use.

As such, when deformation occurs in the light guide plate 15 and the reflection plate 13 that irradiate the light emitted from the light source 17 toward the upper liquid crystal panel (not shown), a large loss in light efficiency may occur, and the deformation may be prevented. Necessary parts are additionally required, which contributes to a price increase.

In addition, according to the structure of the conventional light unit 10, a separation distance is generated between the light source 17 and the light guide plate 15, and the light emitted from the light source 17 is partially transmitted without being directly transmitted to the light guide plate 15. Lost.

Therefore, there is a problem that the light efficiency of the light unit 10 is significantly reduced.

In particular, the light unit 10 is gradually becoming thinner, and as the light unit 10 becomes thinner, the unit price of the light guide plate 15 increases, which acts as a barrier to entry into the market.

The present invention provides a light unit that can prevent the phenomenon of light loss by strengthening the coupling structure of the optical structure such as the light guide plate, the reflecting plate and the like.

In addition, the present invention provides a light unit that can prevent the phenomenon that the light generated from the light source is lost in the process of transferring to the light guide plate by removing the space between the light source and the light guide plate.

In addition, the present invention does not need to use an expensive slim light guide plate product even when the light unit is designed in a thin film structure, and provides a light unit having a light guide plate structure that can be thinly adjusted according to the design structure.

The light unit according to the present invention includes a housing in which an opening is formed toward an upper surface, a mounting space is formed, and a light guide pattern is formed on a bottom of the mounting space; A light source mounted at one end of a bottom surface of the mounting space; And a casting light guide plate molded on the light guide pattern.

Method of manufacturing a light unit according to the present invention comprises the steps of the opening is formed in the upper surface, the mounting space is formed, the housing is processed so that the light guide pattern is formed on the bottom of the mounting space; Mounting a light source at one end of a bottom surface of the housing mounting space; And a molding member is injected into the housing to form a casting light guide plate.

Hereinafter, a method of manufacturing a light unit and a line unit according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In describing the embodiment of the present invention, a configuration of the light unit and a method of manufacturing the same will be described together. Let's do it.

2 is a side cross-sectional view schematically showing the components of the light unit 100 according to an embodiment of the present invention, Figure 3 is a flow chart showing a manufacturing method of the light unit 100 according to an embodiment of the present invention. .

Referring to FIG. 2, the light unit 100 according to the embodiment of the present invention includes a housing 110, a light source 115, a casting light guide plate 117, a diffusion sheet 118, and a prism sheet 119. .

First, the housing 110 is formed, the housing 110 is formed by processing a metal plate, for example, aluminum or stainless steel may be used.

The housing 110 may include a light guide panel (LGP) pattern 112 and a bottom region in which a circuit pattern 114 is formed such that a light source 115 is mounted at one end thereof, and the casting light guide plate 117 is formed. It consists of a cup-shaped side wall area to be molded, a cover portion (110a) area to block the loss of light to the upper portion of the light source 115, the top area other than the cover portion (110a) is an opening opening Is formed.

Therefore, the light guide pattern 112 is formed on a part of the metal plate through, for example, a cutting / scratching process, a press molding process, a die casting process using a milling machine (S100), and the light guide pattern 112 is located next to the light guide pattern 112. A circuit (PCB) pattern 114 is formed (S105).

The light guide pattern 112 has a triangular cross section (a shape for reflecting light emitted from the light source 115 upward), and is formed in a row-shaped protrusion structure, and the circuit pattern 114 is formed using a conductive paste. Can be.

In the region where the circuit pattern 114 is formed, a layer made of a dielectric material is formed, and the circuit pattern 114 is completed through a curing process after a line is formed using a conductive paste thereon.

When the circuit pattern 114 is completed, the remaining regions except for the circuit pattern 114 region may be coated with a reflective material. For example, the circuit pattern 114 may be coated with a metal such as silver (Ag) having good reflectance.

Subsequently, the edge portion of the metal plate is bent to form sidewalls (S110). At this time, the circuit pattern 114, that is, the sidewalls around the region where the light source 115 is located, is bent once more to form the cover part 110a. do.

In addition, when a bending process is performed to form sidewalls, air vents (for example, may be formed in a line shape) 116 are formed in the sidewalls that are bent to form the cover part 110a. The through hole 116 removes bubbles that may be generated when the molding member is injected into the housing 110 to form the casting light guide plate 117, and prevents the inside of the housing 110 from being unfilled. It is to.

When the housing 110 is completed through the above process, the light source 115 is mounted on the circuit pattern 114 (S115).

In an embodiment of the present invention, the light source 115 may be a semiconductor light emitting device such as a cold cathode fluorescent lamp (CCFL), a light emitting device (LED), and the like. When the device is used, it is preferable to use a product manufactured in a side view package.

For example, the light source 115 may be bonded / mounted on the circuit pattern 114 through a surface mounting technology (SMT).

As described above, some of the processes of forming the housing 110 and mounting the light source 115 may be processed in a reversed order. For example, the circuit pattern 114 is formed first and then the light guide pattern 112 is formed. This can be formed.

In addition, when the mounting process of the light source 115 becomes difficult due to the side wall, the light source 115 may be mounted before the edge of the metal plate is bent, and then the side wall may be formed through the bending process.

After the light source 115 is mounted, a casting light guide plate 117 is formed, and a light-transmitting molding member such as a synthetic resin such as PMMA, PC, etc. is injected into the housing 110 (S120), and a curing process is performed. Through the casting light guide plate 117 is completed (S125).

In this case, the casting light guide plate 117 is formed to cover the light source 115 or to be in contact with at least the light emitting surface of the light source 115, so that the light path (spaced space) from the conventional light source 115 to the light guide plate 117. Can be removed, and the light efficiency can be significantly improved.

As described above, the casting light guide plate 117 is minimized by the through-hole 116, which may be generated when the molding member is injected, and may be prevented from being unfilled.

When the casting light guide plate 117 is cured, molding member dregs (commonly referred to as “flash”) formed on the outer surface of the housing 110 through the through holes 116 or overflowing through the openings of the upper surface thereof are formed. Remove (S130).

Then, the optical component is coupled (S135), first, the diffusion sheet (Diffusor sheet) 118 is bonded on the casting light guide plate 117, the prism sheet (Prism sheet) 119 is coupled thereon.

The diffusion sheet 118 diffuses the surface light source emitted from the casting light guide plate 117, and the (horizontal and vertical) prism sheet 119 condenses the diffused light into the emission region.

At this time, if necessary, an optical component such as a protective sheet for protecting the prism acid formed on the prism sheet 119, a reflective polarizing film, or the like may be further combined.

Finally, the optical parts 118 and 1119 are aligned, and aligned using a finishing material such as a light shielding tape (which may be provided as a double-sided black tape) or a reflective tape (which has a metal material coated on a non-adhesive surface). The optical parts 118 and 119 are fixed to the housing 110 (S135).

By using the light blocking tape or the reflective tape, light leakage can be prevented through the non-light emitting region (eg, a minute gap between the housing 110 and the optical components 118 and 119), and the reflection efficiency can be improved. Can be.

As such, when the light unit 100 is completed, a liquid crystal panel may be coupled thereon (not shown), and the liquid crystal panel is formed by injecting a liquid crystal layer between upper and lower substrates, and absorbing both surfaces thereof. A type polarizing film is attached. The upper and lower substrates are transparent glass substrates, and a thin film transistor (TFT) element, which is a switching element of each pixel, is provided in a region where each pixel of the transparent electrode, a color filter, and a liquid crystal element is defined. The driver IC is mounted on the transistor substrate.

As such, the light unit according to the present invention is not a structure in which a separate light guide plate product is inserted into the housing, but is integrally molded, and the reflecting plate is processed in a coating form, thereby securing reliability in the coupling structure of the light guide plate, the reflecting plate, and the housing. can do.

In addition, since the thickness of the light guide plate 117 can be adjusted by adjusting the injection amount of the molding member, the thin light unit can be easily manufactured, and the production cost can be lowered because there is no need to provide an expensive light guide plate product.

Although the present invention has been described above with reference to the embodiments, these are only examples and are not intended to limit the present invention, and those skilled in the art to which the present invention pertains may have an abnormality within the scope not departing from the essential characteristics of the present invention. It will be appreciated that various modifications and applications are not illustrated. For example, each component specifically shown in the embodiment of the present invention can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

According to the light unit according to the present invention, by strengthening the coupling structure of the optical structure, it is easy to process the process, the life of the product is improved, the process failure rate can be lowered, there is an effect that can reduce the production cost.

In addition, according to the present invention, the optical structure including the light source, the light guide plate, and the reflecting plate may be integrally manufactured to prevent a photon from being lost on the transmission path, thereby maximizing the luminous efficiency.

In addition, according to the present invention, it is possible to manufacture a thin film type light unit without using an expensive slim light guide plate product.

Claims (23)

A housing in which an opening is formed at an upper surface, a mounting space is formed, and a light guide pattern is formed at a bottom of the mounting space; A light source mounted at one end of a bottom surface of the mounting space; And And a casting light guide plate molded on the light guide pattern. The method of claim 1, And a diffusion sheet coupled to the casting light guide plate. The method of claim 1, And a prism sheet coupled to the casting light guide plate. The method of claim 1, wherein the casting light guide plate The light unit is molded including the mounting area of the light source. The method of claim 1, wherein the light source A light unit comprising at least one of a fluorescent lamp, a semiconductor light emitting element. The method of claim 1, wherein the housing The light unit has a circuit pattern formed on a portion of the bottom surface on which the light source is mounted. The method of claim 1, wherein the housing Light unit coated on inner surface with reflective material. The method of claim 1, wherein the light guide pattern is A light unit with a stripe structure. The method of claim 1, wherein the housing In the opening is formed, the light unit is formed on the upper surface side of the light source. The method of claim 9, wherein the housing The light unit has a through hole formed on a portion of the cover portion. The method of claim 1, wherein the housing Light unit made of metal. The method of claim 7, wherein the housing The light unit is coated on the inner surface of the silver. An opening is formed at an upper surface side, a mounting space is formed, and a housing is formed to form a light guide pattern on a bottom surface of the mounting space; Mounting a light source at one end of a bottom surface of the housing mounting space; And And a molding member is injected into the housing to form a casting light guide plate. Forming a light guide pattern on a metal plate and forming a circuit pattern on a plate area in which the light source is mounted; Mounting a light source on the circuit pattern; Bending the metal plate to form a housing having an opening formed on an upper surface thereof; And And a molding member is injected into the housing to form a casting light guide plate. The method of claim 13, wherein the housing is formed Forming a light guide pattern on a metal plate and forming a circuit pattern on a plate area in which the light source is mounted; And And the plate is bent to form the mounting space. The method of claim 13, wherein the casting light guide plate is formed. And a step of curing the injected molding member. The method of claim 13, wherein the casting light guide plate is formed. And removing a portion of the molding member formed around the housing after the molding member is injected. The method of claim 13, wherein the housing is formed Method of manufacturing a light unit comprising the step of coating the inner surface of the housing with a reflective material. The method of claim 14, wherein the forming of the circuit pattern is performed. And after the light guide pattern is formed, coating the metal plate with a reflective material. The method according to claim 13 or 14, wherein the housing is formed The opening is formed, the light unit manufacturing method comprising the step of forming a cover portion on the upper portion of the mounting area of the light source. The method of claim 21, wherein forming the cover portion And a through hole formed on a portion of the cover portion. The method according to claim 13 or 14, And combining an optical component including at least one of a diffusion sheet and a prism sheet on the casting light guide plate. The method of claim 22, wherein the optical component is coupled And after the optical component is coupled, fixing the optical component using a finishing material including at least one of a light blocking tape and a reflective tape.
KR1020070060918A 2007-06-21 2007-06-21 Light unit and manufacturing method of light unit KR20080112478A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011108871A2 (en) * 2010-03-04 2011-09-09 에스에스씨피주식회사 Surface emitting device and liquid crystal display device
CN103047584A (en) * 2012-12-07 2013-04-17 京东方科技集团股份有限公司 Backlight module, production method thereof and display device
KR101491465B1 (en) * 2013-03-13 2015-02-11 희성전자 주식회사 Light Converting Module with Cover Buttom

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011108871A2 (en) * 2010-03-04 2011-09-09 에스에스씨피주식회사 Surface emitting device and liquid crystal display device
WO2011108871A3 (en) * 2010-03-04 2011-12-29 에스에스씨피주식회사 Surface emitting device and liquid crystal display device
CN103097944A (en) * 2010-03-04 2013-05-08 Sscp株式会社 Surface emitting device and liquid crystal display device
CN103047584A (en) * 2012-12-07 2013-04-17 京东方科技集团股份有限公司 Backlight module, production method thereof and display device
KR101491465B1 (en) * 2013-03-13 2015-02-11 희성전자 주식회사 Light Converting Module with Cover Buttom

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