KR20080104524A - Light guiding member and light source unit for key pad of cellular phone or back light unit for liquid crystal display having the same - Google Patents

Light guiding member and light source unit for key pad of cellular phone or back light unit for liquid crystal display having the same Download PDF

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Publication number
KR20080104524A
KR20080104524A KR1020070051412A KR20070051412A KR20080104524A KR 20080104524 A KR20080104524 A KR 20080104524A KR 1020070051412 A KR1020070051412 A KR 1020070051412A KR 20070051412 A KR20070051412 A KR 20070051412A KR 20080104524 A KR20080104524 A KR 20080104524A
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KR
South Korea
Prior art keywords
light guide
led
light
guide sheet
thickness
Prior art date
Application number
KR1020070051412A
Other languages
Korean (ko)
Inventor
김종인
정진만
Original Assignee
주식회사 삼한일렉트로닉스
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.)
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Application filed by 주식회사 삼한일렉트로닉스 filed Critical 주식회사 삼한일렉트로닉스
Priority to KR1020070051412A priority Critical patent/KR20080104524A/en
Publication of KR20080104524A publication Critical patent/KR20080104524A/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
    • G02B6/0023—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
    • G02B6/0028—Light guide, e.g. taper
    • 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
    • G02B6/0055—Reflecting 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
    • 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)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Push-Button Switches (AREA)
  • Planar Illumination Modules (AREA)

Abstract

A backlight unit of a mobile terminal liquid crystal display device is provided to improve the light guide efficiency, and reduce the thickness. Light radiated from one or more LEDs(370) is guided to the side. Two LEDs are arranged in neighboring two vertexes of the edge of a printed circuit board(310). A protection resin(340) fixes a metal dome part(325) and fixing resin and protects the metal dome part. The thickness of a light guiding sheet(362) is 0.05 mm through 0.4. The secondary light guide part(364) having the thickness which is increased as it approaches to LED is formed on one surface of top or bottom.

Description

LIGHT GUIDING MEMBER AND LIGHT SOURCE UNIT FOR KEY PAD OF CELLULAR PHONE OR BACK LIGHT UNIT FOR LIQUID CRYSTAL DISPLAY HAVING THE SAME}

1 is an exploded perspective view of a mobile phone including a light source unit for a mobile phone keypad including a light guide member according to an embodiment of the present invention;

2 is an exploded perspective view of a light source unit for a mobile phone keypad of FIG. 1;

3 and 4 are cross-sectional views of the light source unit for the mobile phone keypad of FIG. 1 taken along III-III and IV-IV, respectively;

5 is a cross-sectional view of a light source unit for a mobile phone keypad with a light guide member according to another embodiment of the present invention; and

6 is an exploded perspective view of a liquid crystal display including a light guide member according to another exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

15, 360, 361: light guide member 16, 362: light guide sheet

17, 364, 366: Auxiliary light guide 369: Engraved pattern

12, 370, 371: LED 372, 373: cover member

374: electrode 376, 377: light emitting chip

378: fluorescent member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide member and a light source unit for a portable keypad or a backlight unit for a liquid crystal display including the light guide member, and in particular, a light guide member for guiding light emitted from a light emitting diode (LED) emitting sideways and a portable device including the same. A light source unit for a keypad or a backlight unit for a liquid crystal display device.

In general, the illumination method of the mobile phone keypad has been used a method of illuminating the entire keypad by emitting a plurality of LEDs that are arranged in the lower portion corresponding to the mobile phone keypad. The direct type LED arrangement makes it difficult to slim down the overall mobile phone. Therefore, recently, LEDs emitting sideways at the lower edge of the mobile phone keypad are arranged in an edge type, and a light guide plate disposed below the mobile phone keypad guides the light irradiated from the LED and supplies the keypad to the entire illumination of the keypad. I'm using the way I use it.

However, even in the case of edge type, the light guide plate has a certain thickness, so there is a certain limit in slimming the mobile phone as a whole. If the thickness of the light guide plate is excessively reduced compared to the height of the side emitting LED, the amount of light incident to the light guide plate is reduced. The efficiency will be reduced.

Meanwhile, even when the side light emitting LED and the light guide plate are used for the backlight unit of the liquid crystal display device, the same problem occurs when the thickness of the light guide plate is reduced for the slimming of the liquid crystal display device as a whole.

Accordingly, the technical problem to be achieved by the present invention is to provide a light guide member that is more slim and excellent in light guide efficiency.

Another object of the present invention is to provide a light source unit for a mobile phone keypad or a backlight unit for a liquid crystal display using a light guide member, which is more slim and excellent in light guide efficiency.

The light guide member according to the present invention guides light irradiated from at least one LED emitting light to the side, and has a light guide sheet having a thickness of 0.05 to 0.4 mm, and an upper surface and a bottom surface of an edge of the light guide sheet corresponding to the LED. It is formed on at least one surface and includes an auxiliary light guide having an increased thickness closer to the LED.

The LED may have a height in a direction perpendicular to the plane direction of the light guide sheet of 0.15 to 0.8 mm.

The auxiliary light guide part may have a thickness of 0.1 to 0.55 mm in the vicinity of the LED.

The light guide sheet and the auxiliary light guide part may be made of the same material.

The light guide sheet and the auxiliary light guide part are each made of one of polymethyl meta acrylate (PMMA), polycarbonate (PC), polyurethane, and polyethylene terephthalate (PET). Can be.

The auxiliary light guide part may have a length of 0.5 to 10 mm in a direction parallel to the surface direction of the light guide sheet.

The light guide sheet may have an uneven pattern formed thereon.

The uneven pattern may be an intaglio pattern having a depth of 0.001 to 0.25 mm in a direction perpendicular to the plane direction of the light guide sheet.

Meanwhile, a light source unit for a mobile phone keypad according to the present invention is formed on a printed circuit board and the printed circuit board, and fixes a gap between a plurality of metal domes providing a contact with the printed circuit board and the plurality of metal domes. A metal dome part comprising a resin, at least one LED disposed on an edge of the printed circuit board and emitting side light, and disposed on the metal dome part and corresponding to a light guide sheet having a thickness of 0.05 to 0.4 mm and the LED. And a light guide member formed on at least one of an upper surface and a lower surface of an edge of the light guide sheet, the auxiliary light guide portion having an increased thickness as the LED is closer to the LED.

The LED may have a height in a direction perpendicular to the surface direction of the light guide sheet of 0.15 to 0.8 mm, and the auxiliary light guide portion may have a thickness of 0.1 to 0.55 mm in the vicinity of the LED.

The light guide sheet and the auxiliary light guide part are each made of one of polymethyl meta acrylate (PMMA), polycarbonate (PC), polyurethane, and polyethylene terephthalate (PET). Can be.

The auxiliary light guide part may have a length of 0.5 to 10 mm in a direction parallel to the surface direction of the light guide sheet.

The light guide sheet may have an uneven pattern formed at a portion corresponding to the plurality of metal domes.

The uneven pattern may be an intaglio pattern having a depth of 0.001 to 0.25 mm in a direction perpendicular to the plane direction of the light guide sheet.

A protective resin may be further attached on the metal dome, and may further include a double-sided adhesive film attached to at least a portion of an edge of the protective resin and the light guide member.

The fixed resin may be removed in a region where the auxiliary light guide part is located.

The protective resin and the double-sided adhesive film may be removed in a region where the auxiliary light guide part is located.

In addition, the backlight unit for a liquid crystal display according to the present invention includes a light adjusting member, at least one LED positioned at an edge of the lower part of the light adjusting member and emitting light to the side, and a lower part of the light adjusting member. Guides the light irradiated from the at least one LED, and is formed on at least one of an upper surface and a lower surface of an edge of the light guide sheet having a thickness of 0.05 to 0.4 mm and the light guide sheet corresponding to the at least one LED; And may include a light guiding member including an auxiliary light guiding part having an increased thickness as the LED is closer to the LED.

A plurality of LEDs are disposed along at least one edge of the lower portion of the light control member, and the light guide member is disposed along at least one of an upper surface and a lower surface of one edge of the light guide sheet corresponding to the LED. It may be formed.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

Next, a mobile phone including a light source unit for a mobile phone keypad having a light guide member according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is an exploded perspective view of a mobile phone including a light source unit for a mobile phone keypad including a light guide member according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the light source unit for a mobile phone keypad of FIG. 1, and FIGS. 3 and 4. 1 is a cross-sectional view of the light source unit for a mobile phone keypad of FIG. 1 taken along III-III and IV-IV, respectively.

The mobile phone according to an embodiment of the present invention includes an LCD module 200 and a light source unit 300 for a keypad accommodated between the upper case 100, the lower case 150, and both cases 100 and 150. .

A display window 110 is formed in the upper case 100, and a plurality of keypads 120 are formed below the display window 110.

The LCD module 200 is a combination of a liquid crystal display panel unit (not shown) and a backlight unit (not shown).

The liquid crystal display panel unit (not shown) displays an image to the outside through the display window 110, and the backlight unit (not shown) supplies light for image display to the liquid crystal display panel unit (not shown).

The light source unit 300 for the keypad includes a printed circuit board 310, a metal dome part 320, a protective resin 340, a double-sided adhesive film 350, a light guide member 360, and an LED 370 capable of emitting side surfaces. do.

The printed circuit board 310 may further include a separate connection part extended for connection with an external power source, a driver, and the like.

Two LEDs 370 are disposed, one at each of two adjacent vertices of the edge of the printed circuit board 310. The number and arrangement of the LEDs 370 can be changed as long as the side light emission type is different from the present embodiment.

The LED 370 is formed in the cover member 372 having one side opened, the electrode 374 connected to the side of the cover member 372, and the cover member 372, and is connected to the electrode 374. A light emitting chip 376 and a phosphor 378 covering the light emitting chip 376. The LED 370 preferably has a height of 0.15 to 0.8 mm according to the miniaturization trend for slimming.

The metal dome 320 formed on the printed circuit board 310 includes a plurality of metal domes 325 and a fixed resin 327.

The metal domes 325 are respectively located at portions corresponding to the keypad 120, and provide contact with the printed circuit board 310.

The fixing resin 327 fills the gap between the plurality of metal domes 325 and fixes the position of the metal dome 325. The fixed resin 327 is removed in the region adjacent to the LED 370. The fixed resin 327 may be made of polycarbonate (PC) or polyethylene terephthalate (PET) to have excellent light reflection efficiency.

The protective resin 340 is attached directly on the metal dome 320. The protective resin 340 fixes the metal dome 325 and the fixed resin 327 and protects the metal dome 320. The protective resin 340 is also removed in the region adjacent to the LED 370.

The double-sided adhesive film 350 is attached to a part of the edge of the protective resin 340 that is not adjacent to the LED 370, and the light guide member 360 is attached to the double-sided adhesive film 350.

The light guide member 360 includes a light guide sheet 362 and an auxiliary light guide 364.

The light guide sheet 362 has a thickness d1 of 0.05 to 0.4 mm, which may have flexibility unlike a conventional light guide plate. The light guide sheet 362 is made using any one of polymethyl meta acrylate (PMMA), polycarbonate (PC), polyurethane, and polyethylene terephthalate (PET). .

In addition, the light guide sheet 362 changes the traveling path of the light incident from the LED 370 to the lower surface portion corresponding to the metal dome 325 as shown in FIG. An intaglio pattern 369 is formed as a pattern. The intaglio pattern 369 has a hemispherical cross section having a depth of 0.001 to 0.25 mm, but may also have a conical shape, a polygonal pyramid shape, a truncated cone shape, and a truncated polypyramidal shape. In addition, the intaglio pattern 369 may be formed on an upper surface portion corresponding to the metal dome 325. On the other hand, unlike the present embodiment, the uneven pattern may be an embossed pattern instead of an intaglio pattern 369.

The auxiliary light guide 364 is formed to have an increased thickness as the LED 370 is closer to the lower surface of the edge of the light guide sheet 362 adjacent to the LED 370. That is, as shown in FIG. 4, the auxiliary light guide part 364 has a right triangle shape. Like the light guide sheet 362, the auxiliary light guide part 364 also has polymethyl meta acrylate (PMMA), polycarbonate (PC), polyurethane, and polyethylene terephthalate (PET). It may be made using any one of), it is preferable to be made of the same material as the light guide sheet 362 in consideration of the convenience of manufacturing and the light refractive index.

The length (l) of the bottom side of the auxiliary light guide portion 364 having a right-angled triangular cross section is preferably 0.5 to 10 mm in consideration of a spaced distance from the metal dome 325, and corresponds to a thickness d2. Is preferably 0.1 to 0.55 mm so that the thicknesses d1 and d2 of the entire light guide member 360 in the region adjacent to the LED 370 are substantially the same as the height h1 of the LED 370. Since the fixed resin 327, the protective resin 340, and the double-sided adhesive film 350 are not located in the region where the auxiliary light guide part 364 is located, the auxiliary light guide part 364 has a different location and thickness. It is not restricted.

As described above, the auxiliary light guide part 364 is further formed on the light guide sheet 362 to reduce the thickness of the light guide sheet 362 as compared with the conventional light guide plate, thereby making the overall mobile phone more slimmer. In addition, since a part of the light irradiated from the light emitting chip 376 of the LED 370 enters the auxiliary light guiding portion 364, the light guiding member 360 may travel toward the keypad 120 via the light guiding sheet 362. ) Can further improve the light guide efficiency.

On the other hand, unlike the present embodiment, when the auxiliary light guide 364 satisfies that the height d2 corresponding to the thickness is 0.1 to 0.55 mm in the region adjacent to the LED 370, the cross section is not a right triangle, but another shape. And may be located on the upper surface of the light guide sheet 362.

Hereinafter, with reference to FIG. 5, a light source unit for a mobile phone keypad including a light guide member according to another exemplary embodiment will be described based on differences from the light source unit for a mobile phone keypad of FIG. 4.

5 is a cross-sectional view of a light source unit for a mobile phone keypad with a light guide member according to another embodiment of the present invention.

In the light source unit for a mobile phone keypad according to another embodiment of the present invention, the size of the cover member 373 and the light emitting chip 377 is increased so that the overall height h2 of the LED 371 is shown in FIG. 4. ) Is high at the height h1. Accordingly, the light guide member 361 is the same as the light source unit for the mobile phone keypad of FIG. 4 except that the light guide member 361 further includes an additional auxiliary light guide 364 formed on the top surface of the light guide sheet 362.

The height d3 of the additional auxiliary light guide 366 is determined in consideration of the height h2 of the LED 371. The introduction of the additional auxiliary light guide 366 allows the light emitting chip as shown in FIG. Since a portion a of the light irradiated from 377 can also travel toward the keypad 120 via the light guide sheet 362, the light guide efficiency of the light guide member 361 can be further improved.

Hereinafter, a liquid crystal display including a light guide member according to another exemplary embodiment of the present invention will be described with reference to FIG. 6.

6 is an exploded perspective view of a liquid crystal display including a light guide member according to another exemplary embodiment of the present invention.

As shown in FIG. 6, the liquid crystal display device includes a backlight unit 20 for largely supplying light and a liquid crystal display panel unit 70 in which an image is displayed by receiving light. In addition, it includes a top chassis 60, a mold frame 22 and a bottom chassis 28 for fixing and holding them.

The liquid crystal display panel unit 70 includes a liquid crystal display panel 75, an integrated circuit chip 77, and a flexible printed circuit board 79.

The liquid crystal display panel 75 includes a thin film transistor substrate 73 including a plurality of thin film transistors, a color filter substrate 71 positioned on the thin film transistor substrate 73, and the substrates 71 and 73. It includes a liquid crystal (not shown) injected in between. Polarizers (not shown) are further attached to the upper portion of the color filter substrate 71 and the lower portion of the thin film transistor substrate 73 to polarize light passing through the liquid crystal display panel 75.

The integrated circuit chip 77 is mounted on the thin film transistor substrate 73 to control the liquid crystal display panel 75.

The flexible printed circuit board 79 generates a data signal, a gate driving signal, a signal for driving the liquid crystal display, and a plurality of timing signals for applying these signals at an appropriate time, and generates the gate driving signal and the data driving signal. The gate lines and the data lines of the liquid crystal display panel 75 are respectively applied.

The backlight unit 20 includes a plurality of side-emitting LEDs 12, a light guide member 15, a reflective sheet 26, and a light control member 24 formed on the flexible printed circuit board 14. .

The light adjusting member 24 may be positioned below the liquid crystal display panel unit 70 and may be formed of a diffusion film, a prism film, a protective film, and the like.

A plurality of LEDs 12 are located along one side of the edge of the lower part of the light control member 24.

The light guide member 15 is also positioned below the light control member 24 to guide the light irradiated from the LED 12, and includes a light guide sheet 16 and an auxiliary light guide 17.

The auxiliary light guide part 17 is formed along one edge of the upper surface of the light guide sheet 16 corresponding to the plurality of LEDs 12 to guide a part of the light irradiated to the plurality of LEDs 12 to the light guide sheet 16. It is. Here, the values of the height of the LED 12, the thickness of the light guide sheet 16 and the size of the concave-convex pattern, the thickness of the auxiliary light guide portion 17, the length of the base and the like are the same as those described in the previous embodiment. Unlike the present embodiment, the light guide sheet 16 may be continuously formed along one edge of one side of the lower surface of the light guide sheet 16 corresponding to the plurality of LEDs 12 or one edge of both the top and bottom surfaces thereof.

According to the liquid crystal display device including the light guide member according to the present exemplary embodiment, the light guide member 15 may further include an auxiliary light guide portion 17 formed on the light guide sheet 16. Since the thickness can be reduced, the overall liquid crystal display device can be made slimmer. In addition, since a part of the light irradiated from the LED 12 is incident on the auxiliary light guide part 364 and passes through the light guide sheet 16, the light guide efficiency of the light guide member 360 is advanced. This is further improved.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

As described above, according to the present invention, a light guide member which is more slim and excellent in light guide efficiency is provided. Further, according to the present invention, the light guide unit for a mobile phone keypad or a backlight unit for a liquid crystal display device is provided by adopting such a light guide member, which is slimmer and excellent in light guide efficiency.

Claims (18)

Guides the light emitted from at least one LED that emits laterally, A light guide sheet having a thickness of 0.05 to 0.4 mm, An auxiliary light guide portion formed on at least one of an upper surface and a lower surface of an edge of the light guide sheet corresponding to the LED and having an increased thickness as the LED is closer to the LED. The light guide member including a. In claim 1, The LED has a height in the direction perpendicular to the plane direction of the light guide sheet is 0.15 to 0.8 mm, The auxiliary light guide portion is a light guide member having a thickness of 0.1 to 0.55 mm in the vicinity of the LED. In claim 1, The light guide member and the auxiliary light guide part are made of the same material. In claim 1, The light guide sheet and the auxiliary light guide part are each made of one of polymethyl meta acrylate (PMMA), polycarbonate (PC), polyurethane, and polyethylene terephthalate (PET). Light guide member.        In claim 1, The auxiliary light guide portion is a light guide member having a length of 0.5 to 10 mm in a direction parallel to the surface direction of the light guide sheet. In claim 1, The light guide sheet is a light guide member in which an uneven pattern is formed. In claim 6, The uneven pattern is a light guide member having an intaglio pattern having a depth of 0.001 to 0.25 mm in the direction perpendicular to the surface direction of the light guide sheet. Printed circuit board, A metal dome portion formed on the printed circuit board, the metal dome portion including a fixed resin filling a gap between the plurality of metal domes providing a contact with the printed circuit board and the plurality of metal domes; At least one LED disposed on an edge of the printed circuit board and emitting sideways; and It is disposed on the metal dome, and formed on at least one of the upper and lower surfaces of a light guide sheet having a thickness of 0.05 to 0.4 mm and an edge of the light guide sheet corresponding to the LED, and increases closer to the LED. A light guide member including an auxiliary light guide having a predetermined thickness Light source unit for a mobile phone keypad comprising a. In claim 8, The LED has a height in the direction perpendicular to the plane direction of the light guide sheet is 0.15 to 0.8 mm, The auxiliary light guide portion has a thickness of 0.1 to 0.55 mm in the vicinity of the LED. Light source unit for mobile phone keypad. In claim 8, The light guide sheet and the auxiliary light guide part are each made of one of polymethyl meta acrylate (PMMA), polycarbonate (PC), polyurethane, and polyethylene terephthalate (PET). Light source unit for mobile phone keypad.        In claim 8, And the auxiliary light guiding portion has a length of 0.5 to 10 mm in a direction horizontal to the surface direction of the light guiding sheet. In claim 8, The light guide unit is a light source unit for a mobile phone keypad, the concave-convex pattern is formed in a portion corresponding to the plurality of metal dome. In claim 12, The uneven pattern is a light source unit for a mobile phone keypad is an intaglio pattern having a depth of 0.001 to 0.25 mm in the direction perpendicular to the surface direction of the light guide sheet. In claim 8, Further comprising a protective resin attached on the metal dome, Further comprising a double-sided adhesive film attached to at least a portion of the edge of the protective resin and the light guide member, respectively Light source unit for mobile phone keypad. In claim 8, And the fixing resin is removed in a region where the auxiliary light guide portion is located. The method of claim 14, And the protective resin and the double-sided adhesive film are removed in an area where the auxiliary light guide part is located. In claim 1, With a light control member, At least one LED positioned at an edge of the lower part of the light control member and emitting light to the side; Located at the bottom of the light control member, and guides the light irradiated from the at least one LED, the light guide sheet having a thickness of 0.05 to 0.4 mm and the upper surface of the edge of the light guide sheet corresponding to the at least one LED and The light guide member is formed on at least one surface of a lower surface and includes an auxiliary light guide portion having an increased thickness closer to the LED. A backlight unit for a liquid crystal display device comprising a. The method of claim 17, The plurality of LEDs are disposed along at least one edge of the lower portion of the light control member, The light guide member is formed along at least one of an upper surface and a lower surface of one edge of the light guide sheet corresponding to the LED. Backlight unit for liquid crystal display device.
KR1020070051412A 2007-05-28 2007-05-28 Light guiding member and light source unit for key pad of cellular phone or back light unit for liquid crystal display having the same KR20080104524A (en)

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KR1020070051412A KR20080104524A (en) 2007-05-28 2007-05-28 Light guiding member and light source unit for key pad of cellular phone or back light unit for liquid crystal display having the same

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KR1020070051412A KR20080104524A (en) 2007-05-28 2007-05-28 Light guiding member and light source unit for key pad of cellular phone or back light unit for liquid crystal display having the same

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111722734A (en) * 2019-03-20 2020-09-29 群光电能科技股份有限公司 Light-emitting touch panel device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111722734A (en) * 2019-03-20 2020-09-29 群光电能科技股份有限公司 Light-emitting touch panel device
CN111722734B (en) * 2019-03-20 2024-01-02 群光电能科技股份有限公司 Luminous touch panel device

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