KR101410015B1

KR101410015B1 - Touch key assembly and light indicator assembly for mobile device

Info

Publication number: KR101410015B1
Application number: KR1020140010816A
Authority: KR
Inventors: 정재용
Original assignee: 정재용
Priority date: 2013-11-18
Filing date: 2014-01-28
Publication date: 2014-06-20
Also published as: CN105283938A; WO2015072625A1; CN105283938B

Abstract

The present invention discloses a touch key assembly and a light indicator assembly of a mobile device which can prevent the leakage of light of touch key assembly including a light indicator assembly by a simple laminate structure, and a light indicator assembly. The touch key assembly of the present invention consists of a printed circuit board, a translucent frame, a translucent bottom plate, a reflective sheet and a light guide plate. The printed circuit board has a transmissive window which is formed by removing a part thereof, a touch key pattern which is formed to be adjacent to the transmissive window and a light source which is mounted on the bottom surface to be adjacent to the transmission window. The frame is attached to the bottom surface of the printed circuit board on which the light source is mounted and has a transmissive window by removing a part thereof to arrange the transmissive window of the printed circuit board and light source inside. The bottom plate is attached to the bottom surface of the frame to completely cover the transmissive window of the frame. The reflective sheet is accommodated to the transmissive window of the frame and is attached to the top surface of the bottom plate. The light guide plate is accommodated in the transmissive window of the frame, is attached to the top surface of the reflective sheet and has a scattering pattern to receive light from the light source and emits through the transmissive window. The light indicator assembly of the present invention includes a bottom plate, a reflective sheet, a light guide plate, a base sheet on which a frame is laminated, and a protective film which is attached on the top surface of the base sheet. According to the present invention, the assembly can prevents the leakage of light using the translucent frame and bottom plate which surround the vicinity of the light source, can increase the productivity by a simple laminate structure of the frame, bottom plate, reflective sheet and light guide plate, and can reduce the manufacturing costs.

Description

&Lt; Desc / Clms Page number 1 > TOUCH KEY ASSEMBLY AND LIGHT INDICATOR ASSEMBLY FOR MOBILE DEVICE <

The present invention relates to a mobile device, and more particularly, to a touch key assembly and a light indicator of a mobile device capable of preventing light-leakage property of a touch key assembly including a light indicator assembly by a simple lamination structure. Assembly.

A user interface of various mobile devices such as a smart phone, a tablet computer, a personal digital assistant (PDA), a portable multimedia player (PMP) , A touch pad button (touch pad button), and a touch screen (touch screen). It is important that the user interface of such a mobile device is designed to be easy to use and to allow the user to recognize the function easily. For example, Galaxy series.RTM. (Samsung Electronics Co., Ltd.) and tablet computer (Galaxy Tab.RTM., Samsung Electronics Co., Ltd.) as a smartphone are equipped with a home key button, a menu key, a back key, and a search key.

"Touch key assembly for a mobile terminal" of U.S. Patent Nos. 7,825,907 and 8,049,728 discloses a light source, an optical waveguide for visually displaying the operating state of a touch key, A reflector element, and a light guide assembly. As a light source, a light emitting diode (LED) is mounted in a separate recess of an optical waveguide. The reflection element is attached to the lower surface of the optical waveguide. The light guide is mounted on the touchpad to align with the touch key. An optional light disturbing element is formed on the lower surface of the optical waveguide so that the light of the LED is reflected toward the light guide. The light of the LED is displayed in front of the body through the optical waveguide and the light guide.

Korean Patent No. 10-1324591 entitled " Method for manufacturing a home key of a portable terminal "includes a home key, a menu key, and a back key on a flexible printed circuit board (FPCB) for light and short life of a mobile device. In this touch key assembly, the light indicator assembly for visually displaying the operation state of the menu key and the back key includes a thin optical waveguide attached to the surface of the FPCB, and an LED disposed on the FPCB so as to be adjacent to one side of the optical waveguide And is constituted by an edge light type provided.

The above-described U.S. Patent Nos. 7,825,907 and 8,049,728 entitled "Touch Key Assembly of Mobile Terminal" have to be manufactured by thickening the optical waveguide by the structure in which the LED is immersed in the separate recess of the optical waveguide, (Thin) of the substrate. In addition, there is a disadvantage in that the configuration is complicated and the production cost is increased because the separate recess and the selective optical interference element are formed in the optical waveguide.

A light indicator assembly, which is applied to a touch key assembly of Korean Patent No. 10-1324591, includes an impermeable adhesive tape having a light-passing window formed to prevent leakage of light out of the LED tape to cover the LED and FPCB. However, the taping of the impermeable adhesive tape is performed by the manual operation of the operator, so that the productivity is low and the production cost is high. Further, the edge of the adhesive tape is easily lifted from the FPCB to generate a gap, and light leakage phenomenon occurs due to the gap, thereby deteriorating the quality of the mobile device.

The present invention is intended to solve various problems of the touch key assembly of the conventional mobile device. It is an object of the present invention to provide a touch key assembly and a light indicator assembly of a new mobile device capable of preventing light leakage by a laminated structure.

It is another object of the present invention to provide a touch key assembly and a light indicator assembly of a mobile device that can increase productivity by a simple laminated structure and can greatly reduce a production cost.

According to an aspect of the invention, there is provided a touch key assembly for a mobile device. A touch key assembly of a mobile device according to the present invention includes a printed circuit board having a transmission window formed by removing a portion thereof, a touch key pattern formed adjacent to the transmission window, and a light source disposed on a lower surface adjacent to the transmission window; An opaque rim attached to a lower surface of a printed circuit board on which the light source is mounted and having a transmission window formed by removing a part of the transmission window and the light source of the printed circuit board so as to be disposed inside; An impermeable base attached to the underside of the impermeable frame to completely cover the transmissive window of the impermeable frame; A reflective sheet accommodated in the transmissive window of the impermeable frame and attached to the upper surface of the impermeable base; And a light guide plate which is accommodated in the transmission window of the impermeable frame and attached to the upper surface of the reflection sheet and has a scattering pattern so as to receive the light from the light source and emit the light to the transmission window of the printed circuit board.

A light indicator assembly of a mobile device according to another aspect of the present invention includes a first strip and a second strip separated along the length direction, a base sheet having scraps arranged to surround the first and second strips, ; A plurality of opaque base plates attached to the upper surface of the first and second strips along the longitudinal direction; A plurality of reflective sheets attached to the upper surface of each of the plurality of opaque base plates; A plurality of light guide plates attached to the upper surface of each of the plurality of reflection sheets and having a scattering pattern for scattering light; An opaque rim having a plurality of reflective sheets and a transmissive window formed by partially removing the plurality of light guide plates, the opaque rim being attached to the upper surface of each of the plurality of opaque base plates; And a protective film attached to the upper surface of the base sheet, wherein one side surface of each of the plurality of light guide plates is arranged to receive light of a light source disposed in the transmission window and to exit the transmission window.

The touch key assembly and the light indicator assembly of the mobile device according to the present invention can prevent the light leakage phenomenon due to the impermeable rim and the base plate surrounding the periphery of the light source and provide a simple laminated structure of the rim, Thus, productivity can be enhanced and there is a very useful effect of reducing the production cost.

1 is a front view illustrating a configuration in which a touch key assembly of a mobile device according to the present invention is applied to a smartphone.
2 is a perspective view partially showing a touch key assembly according to the present invention.
3 is a perspective view showing the configuration of FIG. 2 in isolation.
4 is a sectional view taken along the line IV-IV in Fig.
5 is a perspective view of a light indicator assembly in accordance with the present invention.
6 is a sectional view taken along a line VI-VI in Fig.
7 is a perspective view partially illustrating the process of assembling the light indicator assembly according to the present invention.
8 is a perspective view showing a structure in which an impermeable rim is attached to a base sheet in a light indicator assembly according to the present invention.
9 is a sectional view taken along line IX-IX of Fig.
10 is a plan view illustrating a process of assembling a touch key assembly using the light indicator assembly according to the present invention.
11 is a partially enlarged perspective view of another embodiment of the light guide plate in the light indicator assembly according to the present invention.
12 is a plan view showing the light guide plate of Fig.
FIG. 13 is a perspective view partially showing another embodiment of the touch key assembly to which the light guide plate of FIG. 12 (a) is applied.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of a touch key assembly and a light indicator assembly of a mobile device according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 4, a touch key assembly 100 of a mobile device according to the present invention includes an FPCB 110. A transmission window 112 is formed on one side of the FPCB 110 as a printed circuit board. The transmission window 112 is formed by removing a part of the FPCB 110 in a rectangular shape. A touch key pattern 114 is formed on the FPCB 110 around the transmission window 112. For example, with the smartphone 10, the Galaxy series has two touch keys. The two touch keys are formed to be adjacent to both ends of the FPCB 110. One of the two touch keys may be used as the back key 12 and the other may be used as the menu key 14. [ A switch 116 is formed on the upper surface of the FPCB 110. [ The switch 116 may be used as the home key 16 of the smartphone 10. A connector (connector) 118 is mounted on one side of the FPCB 110. The connector 118 is connected to the PCB 18 of the smartphone 10. In general, the back key 12, the menu key 14, and the home key 16 are formed at the lower end of the touch screen 20.

The touch key assembly 100 of the mobile device according to the present invention includes a light source 120 for generating light in order to visually display the operation state of the touch key pattern 114. [ The light source 120 is mounted on the lower surface of the FPCB 110 so as to be adjacent to the transmission window 112. The light source 120 may include an LED 122 and a vertical surface emitting laser.

An impermeable border 130 is attached to the underside of the FPCB 110 so as to completely surround the transmissive window 112 and the LED 122. The rim 130 is configured to receive the transmissive window 112 and the LED 122 and has a transmissive window 132 disposed below the transmissive window 112. The transmission window 132 is formed by removing a part of the rim 130 in a rectangular shape. The upper surface of the rim 130 is bonded to the lower surface of the FPCB 110 by an adhesive layer 134. The rim 130 may be formed of a polyurethane foam tape, a black plastic, a rubber, or the like. The polyurethane foam tape is available from PORON (trade name). The black plastic can be produced by injection molding, for example, by blending a black pigment with a material such as polycarbonate (PC) or acrylic. As the black pigment, for example, carbon black may be used.

An impermeable bottom board 140 is attached to the underside of the rim 130 to completely cover the transmission window 132. The upper surface of the base plate 140 is bonded to the lower surface of the rim 130 by the adhesive layer 142. The base plate 140 may be made of black plastic, polyurethane foam tape. Preferably, the base plate 140 is made of black plastic. The base plate 140 of the black plastic may be thinned to a thickness of about 0.1 mm or less by injection molding. The base plate 140 of the black plastic can be manufactured by attaching an adhesive tape to both sides of polyethylene terephthalate (PET), for example.

A reflection sheet 150 is attached to the upper surface of the bottom plate 140. The reflective sheet 150 is bonded to the upper surface of the base plate 140 by the adhesive layer 142. The adhesive layer 152 is coated on the upper surface of the reflective sheet 150. The reflective sheet 150 may be formed in the form of a double-sided tape having an adhesive layer coated on the upper and lower surfaces thereof. The reflective sheet 150 may be made of PET.

A light guide plate 160 is attached to the upper surface of the reflective sheet 150 to receive the light from the LED 122 and emit the light to the transmission window 112. The upper surface of the light guide plate 160 is exposed through the transmission window 132 of the frame 130 and the transmission window 112 of the FPCB 110. [ One side 162 of the light guide plate 160 is disposed within the rim 130 so as to be adjacent to the LED 122. The lower surface of the light guide plate 160 is bonded to the upper surface of the reflective sheet 150 by the adhesive layer 152. The light guide plate 160 may be made of polymethyl methacrylate (PMMA). In some embodiments, the reflective sheet 150 may be configured as a double-sided tape for joining the bottom plate 140 and the light guide plate 160.

A dot pattern 164 is patterned on the lower surface of the light guide plate 160 by a scattering pattern that scatters light of the LED 122. The dot pattern 164 scatters the light of the LED 122 and emits the light to the upper surface of the light guide plate 160. The dot pattern 164 can be formed by laser processing. In some embodiments, the dot pattern 164 may be formed on the bottom surface of the light guide plate 160 by inkjet printing, imprinting, or the like. In addition, the dot pattern 154 may be formed on the lower surface of the light guide plate 160 by coining. Meanwhile, the light guide plate 160 may be formed of a polymer scattering type light guide plate in which a polymer scattering light is scattered.

Referring to FIG. 1, when the user presses the back key 12 or the menu key 14 of the smartphone 10, the touch key pattern 114 and the LED 122 are activated. The light from the LED 122 is incident on the light guide plate 160 through one side surface 162 of the light guide plate 160. The light guide plate 160 guides the light of the LED 122 to the transmission window 132 of the frame 130 and the transmission window 112 of the FPCB 110 and shines under the back key 12 or the menu key 14 . Thus, the user can easily identify the operating state of the back key 12 or the menu key 14. [ On the other hand, the LED light is completely blocked by the opaque rim 130 and the bottom plate 140 to prevent light leakage, thereby improving the reliability of the mobile device.

5 to 10, the touch key assembly 100 of the mobile device according to the present invention can be manufactured using the light indicator assembly 200. The light indicator assembly 200 includes a plurality of opaque rims 130, a plurality of impermeable base plates 140, a plurality of reflective sheets 150, and a plurality of light guide plates 160 for the structure of the touch key assembly 100 In the form of a sheet or film laminate.

As shown in FIGS. 5 to 7, the light indicator assembly 200 includes a base sheet 210 formed of strips having a narrow width and a long length. Each of the rims 130, the bottom plates 140, the reflective sheets 150 and the light guide plates 160 are attached to the upper surface of the base sheet 210. The base sheet 210 may be made of PC, polyethylene (PE), PET, polypropylene (PP), or the like.

The base sheet 210 includes first to third horizontal cutting lines 212a, 212b and 212c and first to third horizontal cutting lines 212a, 212b and 212c A first strip 214a, a second strip 214b and a scrap (not shown) are formed by first and second vertical cutting lines 212d and 212e formed along the width direction so as to connect both ends of the first strip 214a, Scrap: 214c). The scrap 214c surrounds the first and second strips 214a and 214b.

A plurality of windows 216 are formed in each of the first and second strips 214a and 214b in a row in the longitudinal direction of the base sheet 210. The windows 216 are arranged obliquely with respect to the longitudinal direction of the base sheet 210 to increase the area availability of the base sheet 210. A plurality of holes 218 are formed at intervals along the second horizontal cutting line 212b. Each of the holes 218 is formed between two adjacent windows 216 along the width direction of the base sheet 210 among the windows 216. [ A plurality of locator pin holes 220 are formed at both edges of the first and second strips 214a and 214b. A plurality of locator pin holes 222 are formed at both edges of the scrap 214c. Locator pin holes 222 are used to position the base sheet 210 during punching for the fabrication of the windows 216, for example.

Each of the plurality of impermeable base plates 140 is attached to the upper surface of the base sheet 210 so as to be disposed between the windows 216 and the holes 218 along the longitudinal direction. The impermeable base plates 140 are bonded to the upper surface of the base sheet 210 by the adhesive layer 142. The bottom plates 140 may be formed in the same shape as a double-sided tape on which an adhesive layer is coated on the lower and upper surfaces, respectively. Each of the reflective sheets 150 is bonded to the upper surface of the base plates 140 by an adhesive layer 142. The reflective sheets 150 may be composed of a PET film. Each of the light guide plates 160 is attached to the upper surface of the reflective sheet 150 by the adhesive layer 152. Each of the opaque rims 130 is attached to the top surface of each of the opaque base plates 140 by an adhesive layer 142. Each of the light guide plates 160 is accommodated in the transmission window 132 so that its edge is completely surrounded by the rims 130. [

The light indicator assembly 200 includes a release film 230 attached to the underside of the base sheet 210. An adhesive layer 232 is coated on the upper surface of the release film 230. The release film 230 is bonded to the lower surface of the base sheet 210 by the adhesive layer 232 to maintain the shape of the first and second strips 214a and 214b and the scrap 214c. A protection film 240 is attached to the upper surface of the base sheet 210 to protect the light guide plate 160. In the present embodiment, the frame 130, the bottom plates 140, the reflective sheets 150 and the light guide plates 160 each have a structure for attaching heat to the upper surface of the base sheet 210 However, this is an illustrative example, and the heat of each of the rims 130, the bottom plates 140, the reflective sheets 150, and the light guide plates 160 attached to the upper surface of the base sheet 210 may be increased .

Referring to FIG. 7, a plurality of light guide plates 160 are fabricated by processing the optical waveguide film 250. The light guiding plates 160 are embossed and half blanked so that the light guiding plates 160 are arranged in two rows at intervals along the longitudinal direction of the optical waveguide film 250. The outline of each of the light guide plates 160 is determined by a cutting line 252 formed by half blanking. Each of the light guide plates 160 can be easily separated from the optical waveguide film 250 by the cutting line 252 and attached to the reflection sheet 150. [ A plurality of locator pin holes 254 are formed on both sides of the optical waveguide film 250. Locator pin holes 254 of the optical waveguide film 250 are formed to align with the locator pin holes 220 of the base sheet 210.

Referring to FIGS. 8 and 9, each of the plurality of opaque rims 130 is attached at a distance from one another along the longitudinal direction of the base sheet 260. The base sheet 260 includes a plurality of windows 262 formed in two rows at intervals along the longitudinal direction, a plurality of recesses 264 formed at the edges of the windows 262, And a plurality of locator pin holes 266 formed on both sides thereof. The windows 262 are formed to be aligned with the light guide plates 160 formed on the optical waveguide film 250. Each of the rims 130 is immersed in the recesses 262. [ The locator pin holes 266 of the base sheet 260 are formed to align with the locator pin holes 254 of the optical waveguide film 250. The base sheet 260 may be composed of PC, PE, PET, PP, or the like.

7, the operator may attach a base sheet 210 (not shown) to the locator pins 272 of the jig 270 to which the impermeable base plates 140 and the reflective sheets 150 are attached for attachment of the light guide plates 160 ) Of the locator pin holes (220). The operator inserts the locator pin holes 254 of the optical waveguide film 250 into the locator pins 272 to stack the base sheet 210 and the optical waveguide film 250. The operator presses and joins the light guide plates 160 to the adhesive layer 152, and then removes the optical waveguide film 250 from the base sheet 210.

The operator removes the optical waveguide film 250 and then fits the locator pin holes 220 of the base sheet 260 to the locator pins 272 such that the opaque rim 130 faces downward. The operator pushes the edges 130 to the adhesive layer 142 and joins them, and then removes the base sheet 260 from the base sheet 210. [ The rims 130 are joined to the upper surface of the base plates 140 to completely enclose the light guide plates 160 and block them. The operator removes the base sheet 210, and then attaches the protective film 240 to the upper surface of the base sheet 210.

10, the operator removes the release film 230 and the protective film 240 from the base sheet 210 for the construction of the touch key assembly 100, and then the first and second strips 214a and 214b ) From the scrap 214c. The operator inserts the locator pin holes 220 of the first and second strips 214a and 214b into the locator pins 282 of the jig 280 to form first and second strips 214a and 214b on the top surface of the jig 280, 214b.

2 to 4 and 10, the operator joins each of the opaque rims 130 to the underside of the FPCB 110 by means of the adhesive layer 134. At this time, the operator places the frames 130 on the FPCB 110 (110) so that each of the frames 130 surrounds the transmission window 112 and the LED 122 and the LED 122 faces the one side 162 of the light guide plate 160 ). The operator removes the base plates 140 from the first and second straps 214a, 214b after attachment of the rims 130. [ After the rim 130 is attached to the FPCB 110 in a state where the rim 130, the bottom plate 140, the reflection sheet 150 and the light guide plate 160 are laminated on the base sheet 210 , And the base plate (210) from the base plate (140), the touch key assembly (100) can be easily assembled. Since the frame 130, the base plate 140, the reflection sheet 150 and the light guide plate 160 can be attached to the FPCB 110 in a stacked state, the assembling process can be simplified to improve productivity, Can greatly improve.

11 and 12, a user interface symbol 370 or an icon is formed on the lower surface of the light guide plate 360 in a scattering pattern for scattering light of the LED 122. The user interface symbol 270 is printed by light diffusion ink. Printing of the user interface symbol 370 may be performed by gravure printing, silk screen printing, offset lithography printing, or the like. The user interface symbol 370 shown in FIG. 12 (a) represents the back key symbol 372. The user interface symbol 370 shown in FIG. 12 (b) represents the search key symbol 374.

12, the user interface symbol 370 is formed of a stripe pattern 376 parallel to the optical axis 124 of the LED 122. The stripe pattern 376 is composed of a plurality of stripes 376b arranged at intervals relative to each other so as to have a plurality of optical paths 376a arranged along the optical axis 124. [ That is, the user interface symbol 370 forms the stripes 376b at intervals along the optical axis 124 by printing the light diffusion ink. The light of the LED 122 is reflected along the optical path 376a to make the brightness uniform. On the other hand, when the entire area of the user interface symbol is formed by printing of the light diffusion ink without securing the optical path, the brightness of the user interface symbol is lower than that of the upper surface of the light guide plate 360 where the light diffusion ink is not printed do.

A light diffusion film 378 is formed on the light guide plate 360 opposite to the one side surface 362 by printing of the light diffusion ink to increase the uniformity of the brightness as shown in Figure 12 (b) As shown in Fig. The light diffusion film 378 is formed in a band shape having a constant width along a direction orthogonal to the optical axis 126 and is spaced apart from the user interface symbol 370. The light from the LED 122 is diffused by the light diffusion film 378 to brighten the surroundings, thereby making the brightness of the light guide plate 360 uniform.

11 and 12, the impermeable film 380 is formed in the shape of a band having a constant width along the upper surface edge of the light guide plate 360. As shown in FIG. The impermeable film 380 is printed by impermeable ink, for example Black ink. The impermeable film 380 is printed on the lower surface adjacent to one side 362 of the light guide plate 360. The hot spot refers to a phenomenon that the periphery of the LED 122 appears brighter than the surrounding area. Such a hot spot may be generated at the edge of the light guide plate 360 adjacent to the LED 122. The impermeable film 380 blocks transmission of light through the upper surface of the light guide plate 360 adjacent to the one side surface 362 of the LED 122 on which light is incident, thereby preventing hot spots. The user interface symbol 370, the light diffusion film 378 and the impermeable film 380 are printed on the lower surface of the light guide plate 360 to make the light guide plate 160 thinner than the light guide plate 160 described above.

13 shows another embodiment of the light guide plate in the light indicator assembly according to the present invention. Referring to FIG. 13, a plurality of light guide plates 360 are fabricated by processing the optical waveguide film 350. Each of the light guide plates 360 is arranged at a distance from one another along the longitudinal direction of the optical waveguide film 350. Each of the light guide plates 360 can be easily separated from the optical waveguide film 350 by the cutting line 352. [ The light guiding plate 360 separated from the optical waveguide film 350 is attached to the upper surface of the reflective sheet 150 such that one side surface 362 of the light guiding plate 360 is adjacent to the LED 122, Thereby constituting the key assembly 100.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Touch key assembly 110: FPCB
112: transmission window 120: light source
122: LED 130: Impermeable frame
132: transmission window 140: impermeable base plate
150: reflective sheet 160, 360: light guide plate
200: light indicator assembly 210: base sheet
214a: first strip 214b: second strip
230: release film 240: protective film
250, 350: optical waveguide film 260: base sheet
270, 280: jig 370: user interface symbol
376: stripe pattern 378: light diffusion film
380: Impermeable membrane

Claims

A printed circuit board on which a transparent window is formed, a touch key pattern is formed adjacent to the transparent window, and a light source is mounted on a lower surface of the transparent window so as to be adjacent to the transparent window;
An impermeable frame attached to a lower surface of the printed circuit board on which the light source is mounted and having a transmission window formed by removing a part of the transmission window and the light source to be disposed inside;
An impermeable base attached to the underside of the impermeable rim to completely cover the transmissive window of the impermeable rim;
A reflective sheet accommodated in the transmissive window of the impermeable frame and attached to the upper surface of the impermeable base plate;
And a light guiding plate accommodated in the transmissive window of the opaque frame and attached to the upper surface of the reflective sheet and having a scattering pattern for receiving light from the light source and emitting the light to a transmission window of the printed circuit board The touch key assembly of the mobile device.

The method according to claim 1,
Wherein the light source, the reflective sheet, and the light guide plate are housed in a transmission window of the opaque rim.

3. The method according to claim 1 or 2,
Wherein the scattering pattern comprises a dot pattern formed on a lower surface of the light guide plate to scatter light of the light source.

3. The method according to claim 1 or 2,
Wherein the scattering pattern comprises a user interface symbol printed on a lower surface of the light guide plate by light diffusing ink so as to scatter light of the light source.

5. The method of claim 4,
Wherein the user interface symbol comprises a stripe pattern parallel to the optical axis of the light source such that a plurality of optical paths are formed along the optical axis of the light source.

6. The method of claim 5,
Wherein a light diffusion film is further printed on the lower surface of the light guide plate opposite to the light source by a light diffusion ink along a direction orthogonal to an optical axis of the light source so as to be spaced apart from the interface symbol.

5. The method of claim 4,
Wherein the opaque film is further printed on the edge of one side of the light guide plate adjacent to the light source by impermeable ink.

3. The method according to claim 1 or 2,
Wherein the opaque rim is made of one of a polyurethane foam tape, a black plastic, and a rubber, the opaque base plate is made of black plastic, and the light source is an LED.

A base sheet having a first strip and a second strip separated along the longitudinal direction, and a scrap disposed to surround the first and second strips;
A plurality of opaque base plates attached to the upper surface of the first and second strips along the longitudinal direction;
A plurality of reflective sheets attached to upper surfaces of the plurality of opaque base plates;
A plurality of light guide plates attached to the upper surface of each of the plurality of reflection sheets and having a scattering pattern for scattering light;
An opaque rim having a plurality of reflective sheets and a transmissive window partially formed to receive the plurality of light guide plates, the opaque rim attached to the upper surface of each of the plurality of impervious base plates;
And a protective film attached to an upper surface of the base sheet,
Wherein one side of each of the plurality of light guide plates is arranged to receive light of a light source disposed in the transmission window and to exit to the transmission window.

10. The method of claim 9,
Wherein a release film is further attached to the first and second strips and the underside of the scrap.

11. The method according to claim 9 or 10,
Wherein the scattering pattern comprises a dot pattern formed on a lower surface of the light guide plate so as to scatter light of the light source.

11. The method according to claim 9 or 10,
Wherein the scattering pattern comprises user interface symbols printed on the underside of the light guide plate by light diffusing ink to scatter light of the light source.

13. The method of claim 12,
Wherein the user interface symbol is configured in a stripe pattern parallel to an optical axis of the light source to have a plurality of optical paths arranged along an optical axis of the light source.

14. The method of claim 13,
Wherein a light diffusion film is further printed by a light diffusion ink along a direction orthogonal to an optical axis of the light source so as to be spaced apart from the interface symbol on a lower surface of the light guide plate opposite to the light source.

14. The method of claim 13,
Wherein the opaque film is printed by impermeable ink on one side edge of the light guide plate adjacent to the light source.

11. The method according to claim 9 or 10,
Wherein the plurality of opaque rims and the plurality of opaque rims are attached to the top surface of the plurality of opaque rims so that the opaque windows of the plurality of opaque rims are completely covered by the plurality of impermeable rims, Light indicator assembly of a mobile device comprising a urethane foam tape.