TWI653650B - Keyboard device and manufacturing method thereof - Google Patents

Abstract

The invention provides a keyboard device and a keyboard device manufacturing method. The keyboard device comprises a button bottom plate, a film circuit board and a button. The film circuit board is disposed above the button bottom plate and includes a membrane switch corresponding to the button, and the film circuit board The first colloid and the second colloid made of the same material are disposed on the film, and the elastic system of the button is fixed on the film circuit board by the first colloid, and the second colloid is used to contact the balance bar of the button.

Description

Keyboard device and method of manufacturing same

The present invention relates to the field of input devices, and more particularly to a keyboard device.

Common input devices around the computer include a mouse device, a keyboard device 1, and a trackball device. The keyboard device allows the user to directly input characters and symbols to the computer, and thus is highly valued.

First, the structure and function of the conventional keyboard device 1 will be described. Referring to FIG. 1 to FIG. 3, FIG. 1 is a schematic structural view of a conventional keyboard device, and FIG. 2 is a perspective view of a portion of the keyboard device shown in FIG. FIG. 3 is a perspective exploded view showing a part of the structure of the keyboard device shown in FIG. 1 in another perspective view. For the sake of clarity, only a single button 10' and associated component structures are depicted in Figures 2 and 3. The conventional keyboard device 1 includes buttons 10, 10', a button bottom plate 11, and a film circuit board 12, and the film circuit board 12 has corresponding buttons 10, 10'. The plurality of membrane switches 121, and the buttons 10, 10' include a keycap 101, a scissor-type connecting member 102, and an elastic body 103. The scissor-type connecting member 102 is coupled between the keycap 101 and the key bottom plate 11, and includes a first frame 1021. And the second frame 1022 pivotally connected to the first frame 1021, so that the first frame 1021 and the second frame 1022 can swing relative to each other. Further, the elastic body 103 is disposed between the keycap 101 and the key bottom plate 11 and has a top portion 1031.

When the keycap 101 of any of the keys 10, 10' is pressed and moved downward relative to the key bottom plate 11, the first frame 1021 and the second frame 1022 of the scissor type connecting member 102 are changed from the open state to the superimposed state. The state, and the keycap 101 moving downward, presses the elastic body 103, causing the top 1031 of the elastic body 103 to abut and trigger the corresponding membrane switch 121, so that the keyboard device 1 generates a corresponding button signal. When the buttons 10, 10' are no longer touched, the keycap 101 moves upward relative to the button bottom plate 11 in response to the elastic force of the elastic body 103, and the first frame 1021 and the second frame 1022 are overlapped. The state is changed to the opening and closing state, and the keycap 101 is returned to the original position.

Furthermore, some of the buttons 10', such as those having a length L1 greater than the width W1, further include two balance bars 104, and each of the balance bars 104 includes a crossbar portion 1041 and two at the ends of the crossbar portion 1041. Hooks 1042. Further, the key bottom plate 11 includes a plate body 112 disposed under the film circuit board 12, and a plurality of connection structures 111 extending upward from the board body 112 and passing through the film circuit board 12, and each of the connection structures 111 has a through hole 1111. The crossbar portion 1041 of each balance bar 104 is pivotally connected to the key cap 101 of the button 10', and the two hook portions 1042 of each balance bar 104 respectively pass through the through holes 1111 of the corresponding connecting structure 111.

Please refer to FIG. 4 , which is a schematic diagram of the operation of the balance bar of the keyboard device shown in FIG. 1 . When the keycap 101 of the button 10' moves up or down relative to the button bottom plate 11 When moving, the balance bar 104 will move in the direction D11, the direction D12, the direction D13 or the direction D14, and will be turned in the direction D15 or the direction D16. The purpose of the design is to make the button 10' upward or upward relative to the button bottom plate 11. It can maintain balance without tilting when moving down, and can also increase the strength of the keycap 101.

However, the conventional keyboard device 1 has a disadvantage in that since the balance bar 104 and the key bottom plate 11 are made of a metal material, when the key cap 101 of any of the keys 10' is pressed and pressed down relative to the key bottom plate 11, When moving, the balance bar 104 may generate an audible sound due to the impact of the connection structure 111 or the plate body 112 of the key bottom plate 11, but such sound is unpleasant noise to the user.

In view of this, another conventional technique proposes an improvement scheme. Please refer to FIG. 5, which is a partial structural diagram of another conventional keyboard device, and the keyboard device disclosed in FIG. 5 is also a keyboard device disclosed in Taiwan Patent Publication No. TWI598916. In the keyboard device 9 disclosed in FIG. 5, the keyboard device 9 further includes a flexible cover 911 and a cushion 912. The flexible cover 911 is disposed on the button bottom plate 91 and forms a plurality of perforations 9111 with the button bottom plate 911. The through hole 9112 is configured to extend the hook portion 9042 of the balance bar 904 into the through hole 9111, and the cushion 912 is disposed on the upper surface of the button bottom plate 91 and located in the through hole 9111 to partition the hook portion 9042 of the balance bar 904 from the button bottom plate 91. The soft cover 911 and the cushion 912 are made of a soft plastic material. Therefore, when the balance bar 904 is activated by the key cap (not shown), the keyboard device 9 does not have metal. The impact sound between the two, in order to achieve the effect of reducing noise.

However, the disadvantages of the conventional keyboard device 9 are as follows. The flexible cover 911 and the cushion 912 are all disposed on the upper surface of the key bottom plate 91 in an adhesive manner. Therefore, in the process, the soft cover body 911 is adhered to the key bottom plate 91. As well as the cushion 912, the process is complicated. Further, the flexible cover 911 and the cushion 912 adhered to the key bottom plate 91 are easily detached, and once the detachment occurs, the keyboard device 9 loses the effect of noise reduction. Further, since the flexible cover 911 is made of a soft plastic material such as rubber, the soft cover 911 is easily broken by frequent operation by the user.

According to the above description, the conventional keyboard device still has an improved space.

The main object of the present invention is to provide a keyboard device having a first colloid and a second colloid made of the same material on a film circuit board. The first colloid mainly allows the elastic body of the button to be fixed via the first colloid. On the film circuit board, the second colloid is mainly used for buffering when the balance bar of the button is provided after solidification, so that the keyboard device has the function of noise reduction.

In a preferred embodiment, the present invention provides a keyboard device comprising: a button bottom plate; a film circuit board disposed above the button bottom plate and including a membrane switch; and a button including a key cap and a a balance bar and an elastic body, and the balance bar is connected between the key cap and the bottom plate of the button, and the elastic body is disposed between the key cap and the film circuit board and has an abutting top when the key cap is When pressed, the elastomer is compressed such that the abutting top abuts the membrane switch, when the key cap is no longer touched, The elastic body provides an elastic force to the key cap to return the key cap to the original position; wherein the film circuit board is provided with a first colloid and a second colloid, and the first colloid and the second adhesive system are identical The material is made of a material, and the elastic body is fixed on the film circuit board by the first colloid, and the second gel is used to contact the balance bar.

In a preferred embodiment, the present invention also provides a method for manufacturing a keyboard device, comprising: (P1) forming a first transparent adhesive region and a second transparent adhesive region on a screen; (P2) a plate is placed over the film circuit board; and (P3) coating a gel on the mesh plate to form the first colloid on the film circuit board corresponding to the first adhesive region and to make the film The second colloid is formed on the circuit board corresponding to the second transparent adhesive region.

1‧‧‧ keyboard device

2‧‧‧ keyboard device

3‧‧‧ stencil

4‧‧‧ colloid

9‧‧‧ keyboard device

10‧‧‧ button

10’‧‧‧ button

11‧‧‧Keyboard

12‧‧‧film circuit board

20‧‧‧ button

20’‧‧‧ button

21‧‧‧Keyboard

22‧‧‧film circuit board

31‧‧‧First transparent area

32‧‧‧Second transparent area

33‧‧‧Mesh

101‧‧‧Key Cap

102‧‧‧Scissors connecting components

103‧‧‧ Elastomers

104‧‧‧Balance rod

111‧‧‧Connection structure

121‧‧‧ Membrane switch

201‧‧‧Key Cap

202‧‧‧Connecting components

203‧‧‧ Elastomers

204‧‧‧Balance rod

211‧‧‧ Connection structure

212‧‧‧ board

213‧‧‧First floor card hook

214‧‧‧Second floor card hook

221‧‧‧ membrane switch

222‧‧‧Upper film

223‧‧‧Under film

224‧‧‧Medium film

225‧‧‧Extension

226‧‧‧First colloid

227‧‧‧Second colloid

904‧‧‧Balance rod

911‧‧‧Soft cover

912‧‧‧ cushion

1021‧‧‧ first frame

1022‧‧‧ second framework

1031‧‧‧ arrive at the top

1041‧‧‧crossbar

1042‧‧‧Hook

1111‧‧‧Perforation

2011‧‧‧fixed hook

2012‧‧‧ activity card

2013‧‧‧Balance rod buckle

2021‧‧‧ first frame

2022‧‧‧ second framework

2031‧‧‧ arrive at the top

2041‧‧‧crossbar

2042‧‧‧Hook

2111‧‧‧Perforation

2221‧‧‧First circuit pattern

2222‧‧‧Contacts

2231‧‧‧Second circuit pattern

2232‧‧‧Contacts

2241‧‧‧Contact opening

2251‧‧‧Extended convex

9042‧‧‧Hook

9111‧‧‧Perforation

20211‧‧‧ First end of the first frame

20212‧‧‧The second end of the first frame

20221‧‧‧ First end of the second frame

20222‧‧‧ second end of the second frame

D11‧‧ Direction

D12‧‧ Direction

D13‧‧ Direction

D14‧‧ Direction

D15‧‧ Direction

D16‧‧ Direction

D21‧‧ Direction

D22‧‧ Direction

D23‧‧ Direction

D24‧‧ Direction

D25‧‧ Direction

D26‧‧ Direction

D27‧‧ Direction

D28‧‧ Direction

L1‧‧‧ length

L2‧‧‧ length

P1‧‧‧ steps

P2‧‧‧ steps

P3‧‧‧ steps

W1‧‧‧Width

W2‧‧‧Width

Figure 1 is a schematic diagram showing the appearance of a conventional keyboard device.

2 is a perspective exploded view showing a portion of the structure of the keyboard device shown in FIG. 1 at a viewing angle.

Figure 3 is a perspective exploded view showing a portion of the structure of the keyboard device shown in Figure 1 in a different perspective.

Fig. 4 is a schematic view showing the operation of the balance bar of the keyboard device shown in Fig. 1.

Fig. 5 is a partial structural schematic view of another conventional keyboard device.

Figure 6 is a view showing the appearance of a keyboard device of the present invention in a preferred embodiment Schematic diagram.

Figure 7 is a perspective exploded view showing a portion of the structure of the keyboard device shown in Figure 6 in a perspective view.

Figure 8 is a perspective exploded view showing a portion of the structure of the keyboard device shown in Figure 6 in a different perspective.

Fig. 9 is a perspective exploded view showing the film circuit board of the keyboard device shown in Fig. 6.

Fig. 10 is a structural schematic view showing the assembled of the key bottom plate and the film circuit board of the keyboard device shown in Fig. 6.

Figure 11 is a schematic view showing the operation of the balance bar of the keyboard device shown in Figure 6.

Figure 12 is a block diagram showing a preferred block diagram of a method of manufacturing a keyboard device of the present invention.

Figure 13 is a schematic illustration of a preferred concept for performing the method of Figure 12.

FIG. 14 is a structural schematic view of the keyboard device, the film circuit board and the balance bar of the keyboard device of the present invention after being assembled according to another preferred embodiment.

Referring to FIG. 6 to FIG. 8 , FIG. 6 is a schematic structural view of a keyboard device according to a preferred embodiment of the present invention. FIG. 7 is a perspective exploded view of a portion of the keyboard device shown in FIG. FIG. 6 is a perspective exploded view of a portion of the keyboard device shown in another perspective. In order to make it clearer, Figure 7 and Figure 8 and the other figures below depict only a single button 20' and associated component structure. The keyboard device 2 includes a plurality of buttons 20, 20', a button bottom plate 21, and a film circuit board 22, and the buttons 20, 20' can be classified into general keys, numeric keys, function keys, etc., respectively, for the user to touch with a finger. Pressing causes the keyboard device 2 to generate a corresponding button signal to the computer, thereby causing the computer to perform corresponding functions, such as a general button for inputting symbols such as English letters, a numeric button for inputting numbers, and a function button for providing various functions. Quick functions, such as F1~F12.

In addition, please refer to FIG. 9 in synchronization, which is a perspective exploded view of the film circuit board of the keyboard device shown in FIG. 6. In order to clearly show the structure of each layer in FIG. 9, the thickness of each film in FIG. 7 is merely an example, and Only a single upper contact, a single lower contact, and a single contact opening are depicted in FIG. The film circuit board 22 includes an upper film 222, a lower film 223, and a middle film 224 which are laminated on each other. The lower surface of the upper film 222 has a first circuit pattern 2221, and the first circuit pattern 2221 has corresponding buttons 20, 20', respectively. a plurality of upper contacts 2222, and the upper surface of the lower film 223 has a second circuit pattern 2231, and the second circuit pattern 2231 has a plurality of lower contacts 2232 corresponding to the plurality of upper contacts 2222, respectively; wherein each upper contact 2222 has a spacing between its corresponding lower contact 2232 and forms a membrane switch 221 with the corresponding lower contact 2232. The intermediate film 224 is disposed between the upper film 222 and the lower film 223, and the intermediate film 224 has a corresponding upper contact 2222, respectively, in order to have a spacing between each of the upper contacts 2222 and the corresponding lower contacts 2232. And a plurality of contact openings 2241 of the lower contacts 2232. Preferably, but not limited thereto, any of the upper film 222, the lower film 223, and the intermediate film 224 may be made of polycarbonate (PC) or polyethylene terephthalate (PET). Acrylic plastic (PMMA) material, polyurethane (Polyurethane, PU) material or polyimine Made of (Polyimide, PI) material.

Moreover, each of the buttons 20, 20' includes a keycap 201, a connecting member 202, and an elastic body 203, and the connecting member 202 is coupled between the keycap 201 and the key bottom plate 21 for making the keycap 201 movable relative to the key bottom plate 21. The upper body 203 is disposed between the keycap 201 and the button bottom plate 21 and has an abutting top portion 2031. In the preferred embodiment, the lower surface of the keycap 201 further has a fixed hook 201 and a movable hook 2012, and the connecting component 202 is a scissor connecting component, and includes a first frame 2021 and a pivotal connection. The second frame 2022 of the first frame 2021, and the first frame 2021 and the second frame 2022 are an inner frame and an outer frame, respectively.

Furthermore, the key bottom plate 21 includes a plate body 212 disposed under the film circuit board 22, and a first bottom plate hook 213 and a second bottom plate hook 214 extending upward from the plate body 212 and passing through the film circuit board 22. The first end 20211 and the second end 20212 of the first frame 2021 are respectively connected to the fixed hooks 2011 of the keycap 201 and the second bottom hooks 214 of the button bottom plate 21, and the first end 20221 of the second frame 2022 is The second end 20222 is respectively connected to the first bottom plate hook 213 of the button bottom plate 21 and the movable hook 2012 of the key cap 201. Based on the above structural design, the first frame 2021 and the second frame 2022 can be swung relative to each other to be overlapped. The state transitions to the open or close state or from the open and close state to the merged state. However, the above is only one embodiment, and the connection relationship between the connecting member 202, the button bottom plate 21, and the keycap 201 is not limited thereto.

When the keycap 201 of any of the buttons 20, 20' is pressed and moved downward relative to the key bottom plate 21, the first frame 2021 and the second frame 2022 of the connecting member 202 are changed from the open state to the overlap state. And the keycap 201 moving down will squeeze The elastic body 203 is pressed to abut the top 2031 of the elastic body 203 and trigger the corresponding upper contact 2222, so that the corresponding upper contact 2222 contacts the corresponding contact opening 2241 via the corresponding contact opening 2241. The lower contact 2232 is used to electrically connect the corresponding membrane switch 221 to cause the keyboard device 2 to generate a corresponding button signal. When the key cap 201 of the button 20, 20' is no longer touched, the key cap 201 moves upward relative to the button bottom plate 21 in response to the elastic force of the elastic body 203, and the first frame 2021 and the second frame 2022 are at this time. The superimposed state is changed to the open state, and the keycap 201 is returned to the original position.

Please refer to FIG. 6 to FIG. 8 again. Some buttons 20' (such as the button whose length L2 is greater than the width W2) further include two balance bars 204, and each balance bar 204 is connected to the button 20' and the button bottom plate 21. And including a crossbar portion 2041 and two hook portions 2042 respectively located at two ends of the crossbar portion 2041. Moreover, the keycaps 201 of the buttons 20' further include a balance bar latching portion 2013 on the lower surface of the keycap 201, and the crossbar portion 2041 of each balance bar 204 passes through the balance of the corresponding keycap 201. The lever latching portion 2013 is pivotally connected to the corresponding keycap 201, and the button bottom plate 21 further includes a plurality of connecting structures 211 extending upward from the board body 212 and passing through the film wiring board 22, and each connecting structure 211 has A through hole 2111, wherein the hook portions 2042 of the balance bars 204 pass through the through holes 2111 of the corresponding connecting structures 211, respectively.

Referring to FIG. 9, the film circuit board 22 of the keyboard device 2 of the present invention further includes a plurality of extending portions 225 extending from the lower film 223 toward the connecting structures 211, and each extending portion 225 has a through hole 2111. One side extends to the other side of the through hole 2111 to extend an extension 2251. However, the above-mentioned extensions 225 are not limited to extend from the lower film 223 to the connecting structures 211, and the extensions 225 may also be modified to be designed from the middle film 224. Or the upper film 222 extends in the direction of the connecting structures 211, respectively.

Furthermore, in the invention of the present invention, a plurality of first colloids 226 and a plurality of second colloids 227 are further disposed on the film circuit board. For the sake of clarity, FIGS. 7, 9 and the following other figures are only drawn one by one. The first colloid and a portion of the second colloid. The positions of the first colloids 226 are respectively corresponding to the positions of the elastic bodies 203 of the buttons 20, 20', so that the elastic body 203 can be fixed on the film circuit board 22 via the first colloid 226, and The second colloids 227 are respectively located on the extensions 225, which are mainly used for providing a buffer when the balance bar 204 is actuated after solidification, which will be described in detail later.

Please refer to FIG. 10 and FIG. 11. FIG. 10 is a schematic structural view of the keyboard bottom plate and the film circuit board of the keyboard device shown in FIG. 6, and FIG. 11 is a schematic diagram of the operation of the balance bar of the keyboard device shown in FIG. For the sake of clarity, elements such as the keycap 201, the connecting member 202, and the elastic body 203 are not depicted in FIGS. 10 and 11. When the keycap 201 of the button 20' moves up or down relative to the button bottom plate 21, each balance bar 204 will repeatedly move in the direction D21 and the direction D22, and/or in the direction D23 and the direction D24, and/or Or moving in the direction D25 and the direction D26, and inverting in the direction D27 or the direction D28, and the crossbar portion 2041 is also rotated relative to the plurality of balance bar latching portions 2013 of the keycap 201, so that the purpose is to make the button 20' can maintain balance without tilting when moving up or down with respect to the key bottom plate 21, and can also increase the strength of the keycap 201.

As shown in FIG. 10 and FIG. 11 , the film circuit board 22 of the keyboard device 2 of the present invention includes an extension portion 225 that partitions the two hook portions 2042 of the balance bar 204 from the button bottom plate 21, and the extension portion 225 is provided. The second colloid 227 is in contact with the hook portion 2042 of the balance bar 204 and is movable on the second colloid 227, therefore, Even if the balance bar 204 and the button bottom plate 21 are made of a metal material, when the key cap 201 of the button 20' moves up or down relative to the button bottom plate 21 to cause the balance bar 204 to operate, the film circuit board The second colloid 227 on the 22 can buffer the impact of the hook portion 2042 of the balance bar 204, so that the sound of the impact of the keyboard device 2 can be reduced to achieve the effect of noise reduction.

Specifically, the first colloids 226 and the second colloids 227 on the film circuit board 22 are made of the same material and formed on the film wiring board 22 through the same process. Further, in order to fix the elastic body 203 of the button 20, 20', the first colloid 226 is disposed on the film circuit board 22 in the process of the keyboard device 2, and the invention is provided with the first colloid 226. The second colloid 227 is simultaneously disposed on the step of the keyboard device 2, so that the step of setting the second colloid 227 is not required to be added in the process of the keyboard device 2, which is quite easy in the process, and is also effective for improving the softness through the adhesive manner as shown in FIG. Defects caused by the cover 911 and the cushion 912.

In summary of the above description, the present invention also provides a method of manufacturing a keyboard device. Referring to FIG. 12 and FIG. 13, FIG. 12 is a schematic block diagram of a method for manufacturing a keyboard device according to the present invention, and FIG. 13 is a schematic diagram of a preferred embodiment of the method shown in FIG. The method for manufacturing the keyboard device of the present invention includes the steps P1 to P3, but it is only an embodiment, and is not limited thereto.

In step P1, a plurality of first transparent adhesive regions 31 and a plurality of second transparent adhesive regions 32 are formed on the stencil 3; wherein the positions of the first transparent adhesive regions 31 are fixed according to the thin film circuit board 22 The position of the elastic body 203 is determined, and the second transparent adhesive regions 32 are determined according to the position on the film circuit board 22 that needs to be in contact with the balance bar 204.

In a preferred embodiment, the mesh panel 3 is formed by fixing a mesh cloth 33 made of a material such as a nylon mesh cloth, a Tedron mesh cloth, a steel mesh cloth, or the like to the frame. After the position of the glue region 31 and the position of the second transparent rubber regions 32 are determined, the mesh cloth 33 is first coated with a photosensitive paint (not shown), and then the first transparent rubber regions 31 are The second transparent regions 32 are flushed out. However, the above is only an embodiment, and the manner of fabricating the stencil 3 and rinsing out the first transparent adhesive region 31 and the second transparent adhesive region 32 are not limited to the above, and are known to those skilled in the art. This will not be repeated here.

In step P2, the stencil 3 is aligned on the film wiring board 22.

In step P3, the coating body 4 is applied to the stencil 3 to form a first colloid 226 corresponding to the first permeable adhesive region 31 on the film circuit board 22 and the film permeable panel 22 corresponding to the second permeable adhesive region 32. A second colloid 227 is formed.

Further, in a preferred embodiment, the colloid 4 is flattened by the scraper (not shown) from the first transparent adhesive region 31 and the second transparent adhesive regions 32 to form a colloid. 4, respectively, from the first transparent adhesive region 31 and the second transparent adhesive region 32 to the thin film circuit board 22 to have the first colloid 226 and the second film on the thin film circuit board 22 Colloid 227. The first colloids 226 are respectively fixed to the thin film circuit board 22 by the elastic bodies 203, and the second colloids 226 are configured to provide a buffer for the balance bar 204 to be actuated.

Of course, the above is only an embodiment, and any person skilled in the art can make any equal change design according to actual application requirements. For example, please refer to FIG. 14 , which is a structural diagram of the keyboard device, the film circuit board and the balance bar of the keyboard device according to another preferred embodiment of the present invention. For the sake of clarity, elements such as a keycap, a connecting member, and an elastomer are not depicted in FIG. Among them, the preferred implementation The keyboard device of the example is substantially similar to that described in the prior preferred embodiment and will not be further described herein. The preferred embodiment is different from the foregoing preferred embodiment in that the second colloids 227 are disposed on the extending portions 225 and are disposed on the crossbar portions 2041 corresponding to the balance bars 204. The process method is also the same as that shown in Fig. 12, and will not be described again here.

The second colloids 227 correspondingly disposed under the crossbar portion 2041 of the balance bar 204 are also used for buffering when the balance bar 204 is actuated after solidification, that is, when the key cap of the button is opposite to When the button bottom plate 21 moves up or down to make the balance bar 204 actuate, the second colloids 227 correspondingly disposed under the cross bar portion 2041 of the balance bar 204 have a cross bar portion that can buffer the balance bar 204. The effect of the 2041 striking the film circuit board 22 and the key bottom plate 21 reduces the noise of the keyboard device 2 and reduces the noise.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, any equivalent changes or modifications made without departing from the spirit of the present invention should be included in the present invention. Within the scope of the patent application.

Claims (1)

A keyboard device includes a button bottom plate, a film circuit board disposed above the button bottom plate and including a membrane switch, and a button including a key cap, a balance bar and an elastic body, and The balance bar is connected between the key cap and the bottom plate of the button, and the elastic body is disposed between the key cap and the film circuit board. The manufacturing method comprises: forming a first colloid and a film on the film circuit board a second colloid, the first colloid and the second adhesive system are made of the same material, and the elastic body is fixed on the thin film circuit board by the first colloid, and the second colloid is used for balancing with the second colloid Contacting the rods includes the steps of: (P1) forming a first transparent area on a stencil and a second transparent area; (P2) placing the stencil above the thin film circuit; and (P3) Applying a colloid to the stencil to form the first colloid corresponding to the first permeable region on the film circuit board and corresponding to the second permeable region on the film circuit board The second colloid is formed.