TW201545190A - Backlight structure adapted to an illuminating keyboard and method for manufacturing same - Google Patents

Abstract

A backlight structure includes a light-guide plate, a light-emitting unit, a reflecting plate, a cure flowable layer and an adhesive layer. The light-guide plate has an incident surface, an emitting surface, a bottom surface opposite to the emitting surface and a lateral surface. The light-emitting unit is adjacent to the incident surface. A light emitted from the light-emitting unit enters the light-guide plate via the incident surface and emits from the emitting surface. The reflecting plate is disposed below the bottom surface for reflecting the light emitting from the bottom surface. The cure flowable layer is disposed on the lateral surface for masking the light from emitting from the lateral surface. The adhesive layer is attached to the light-guide plate and the reflecting plate for constraining a range that the cure flowable layer enters the reflecting plate and the light-guide plate during process that the cure flowable layer is disposed on a periphery of the reflecting plate.

Description

Backlight structure suitable for illuminating keyboard and manufacturing method thereof

The present invention relates to a backlight structure and a method of fabricating the same, and more particularly to a backlight structure capable of preventing edge leakage and a method of fabricating the same.

In terms of current personal computer usage habits, the keyboard is one of the indispensable input devices for entering text, symbols or numbers. Recently, with the improvement of consumer visual appeal, a illuminating backlit keyboard has become a new development direction in the industry. In general, a backlit keyboard adopts an edge-lit backlight module as its light source, and a light-emitting diode for emitting light is disposed on one side of a light-incident surface of one of the light guide plates, thereby being emitted by the light-emitting diode. The light can enter the light guide plate from the light incident surface and be emitted from the light exit surface of one of the light guide plates, so that the light is transmitted through the bottom plate to cause the keyboard to emit light. However, the light entering the light guide plate may also be emitted from the other edge of the light guide plate, so that the other edge of the light guide plate forms a bright spot and affects the appearance of the backlit keyboard.

Accordingly, the present invention provides a backlight structure capable of preventing edge leakage and a method of fabricating the same to solve the above problems.

In order to achieve the above object, the present invention discloses a backlight structure suitable for an illuminated keyboard, comprising a light guide plate, a light emitting unit, a reflective sheet, a first adhesive layer and a first fluid cured layer. The light guide plate has a light incident surface, a light exiting surface, a bottom surface and a side surface opposite to the light emitting surface, and the light emitting unit is adjacent to the light incident surface, and a light emitted by the light emitting unit passes through the light entering The surface enters the light guide plate and is emitted from the light exit surface. The reflective sheet is disposed under the bottom surface, and the reflective sheet is configured to reflect the light emitted from the bottom surface. The reflective sheet has a size larger than the size of the light guide plate. The reflective sheet has a reflective sheet edge, and the reflective sheet edge extends from the side surface. Highlight a specific distance. The first adhesive layer is disposed between the bottom surface and the reflective sheet. The first fluid cured layer is disposed at an edge of the reflective sheet adjacent to the side surface. The first fluid solidified layer is configured to block the light from being emitted through the side surface. The first fluid cured layer is flowable in an uncured state. The first adhesive layer limits a range in which the first fluid-cured layer can flow between the reflective sheet and the light guide plate when the first fluid-cured layer is disposed in the edge of the reflective sheet and is in the uncured state.

According to one embodiment of the present invention, a method for manufacturing a backlight structure of an illuminated keyboard includes the following steps (a): preparing a light guide plate having a light exit surface, a bottom surface, and a side surface; b) preparing a reflective sheet having a size larger than the size of the light guide plate, the reflective sheet having a reflective sheet edge; (c) bonding the light guide plate to the reflective sheet using a first adhesive layer, wherein the first adhesive layer a layer between the bottom surface and the reflective sheet, the edge of the reflective sheet extending from the side surface by a specific distance; and (d) a first fluid-cured layer disposed adjacent to the edge of the reflective sheet and adjacent to the side of the reflective sheet, and the first layer The adhesive layer limits the extent to which the first fluid-cured layer can flow between the reflective sheet and the light guide plate.

According to one embodiment of the present invention, a backlight structure suitable for an illuminated keyboard includes a light guide plate, a light emitting unit, a mask, a first adhesive layer, and a first fluid cured layer. The light guide plate has a light incident surface, a light exiting surface, a bottom surface and a side surface opposite to the light emitting surface, and the light emitting unit is adjacent to the light incident surface, and a light emitted by the light emitting unit enters the light through the light incident surface. The light plate is emitted from the light exit surface. The mask is disposed on the light-emitting surface, the mask is used to limit a light-emitting area of the light guide plate, the size of the mask is larger than the size of the light guide plate, and the mask has a matte edge, and the edge of the mask extends from the side Highlight a specific distance. The first adhesive layer is disposed between the light-emitting surface and the mask. The first fluid-cured layer is disposed at an edge of the mask and adjacent to the side surface. The first fluid-cured layer is configured to block the light from being emitted through the side. The first fluid cured layer is flowable in an uncured state. Providing the first fluid curing layer to the side of the mask The first adhesive layer limits the range in which the first fluid-cured layer can flow between the mask and the light guide plate during the edge process and in the uncured state.

According to one embodiment of the present invention, a method for manufacturing a backlight structure of an illuminated keyboard includes the following steps (a): preparing a light guide plate having a light emitting surface and a side surface; (b) preparing a mask having a size larger than the light guide plate, the mask having a matte edge; (c) bonding the light guide plate to the mask using a first adhesive layer, wherein the first adhesive layer is located at the light exiting layer Between the face and the mask, and the edge of the mask extends from the side by a specific distance and (d) a first fluid-cured layer is disposed adjacent to the edge of the mask and adjacent to the side, and the first adhesive layer is limited The first fluid-cured layer can flow into the range between the mask and the light guide plate.

In summary, the present invention can utilize a reflective sheet or a mask as a substrate, and an adhesive layer is used to adhere the light guide plate to the substrate (ie, a reflective sheet or a mask) to provide a fluid cured layer on the light guide plate. The edge is the basis of the edge of the hole on the light guide plate, so that the fluid solidified layer can be disposed on the edge of the light guide plate or the edge of the hole on the light guide plate, thereby blocking the light from being emitted from the edge of the light guide plate or the edge of the hole on the light guide plate, thereby reducing The light forms a bright spot on the edge of the light guide or at the edge of the hole on the light guide plate, thereby improving the appearance of the backlit keyboard. The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the embodiments of the invention.

3000‧‧‧Backlit keyboard

1‧‧‧ Keyboard Department

10‧‧‧floor

11‧‧‧ button

2, 2', 2", 2'''‧‧‧ backlight structure

20‧‧‧Light guide

201‧‧‧Into the glossy surface

202‧‧‧Glossy surface

2021‧‧‧ peripheral surface

2022‧‧‧Central light exit area

203‧‧‧ bottom

2031‧‧‧ peripheral bottom

2032‧‧‧Central reflection zone

204‧‧‧ side

205‧‧‧Perforation

2051‧‧‧Perforated side

206‧‧‧ outer periphery of the light guide plate

207‧‧‧The inner circumference of the light guide plate

208‧‧‧ inside area

209‧‧‧Outer area

21‧‧‧Lighting unit

22‧‧‧reflector

221‧‧‧reflector edge

23‧‧‧First fluid solidified layer

231‧‧‧Part 1

232‧‧‧Part II

233‧‧‧Part III

24, 24', 24" ‧ ‧ first adhesive layer

241, 241', 241" ‧ ‧ outside

242, 242', 242" ‧ ‧ inside

25‧‧‧Second fluid solidified layer

26‧‧‧Second adhesive layer

27‧‧‧Mask

271‧‧‧Light transmission area

272‧‧‧Opacity zone

273‧‧‧Mask edge

28‧‧‧reflective layer

L‧‧‧Light

D, D', D" ‧ ‧ specific distance

W, W', W", W'''‧‧‧ width

S1‧‧‧ first infiltration space

S2‧‧‧Second infiltration space

X-X, Y-Y‧‧‧ hatching

100~106, 300~306‧‧‧ steps

1 is a schematic view of a backlit keyboard according to a first embodiment of the present invention.

2 is a schematic exploded view of a backlight structure according to a first embodiment of the present invention.

Figure 3A is a partial cross-sectional view of the backlight structure shown in Figure 2 along section line X-X.

Figure 3B is a partial cross-sectional view of the backlight structure shown in Figure 2 along section line Y-Y.

4 is a flow chart showing a method of manufacturing a backlight structure according to a first embodiment of the present invention.

FIG. 5A is a schematic top plan view showing the steps 100 and 102 of the backlight structure according to the first embodiment of the present invention.

Fig. 5B is a schematic cross-sectional view showing the assembly of the backlight structure shown in Fig. 5A.

FIG. 6A is a schematic top plan view showing the step 104 of the backlight structure according to the first embodiment of the present invention.

Figure 6B is a schematic cross-sectional view showing the assembly of the backlight structure shown in Figure 6A.

FIG. 7A is a schematic top plan view showing the step 106 of the backlight structure according to the first embodiment of the present invention.

Figure 7B is a schematic cross-sectional view showing the assembly of the backlight structure shown in Figure 7A.

FIG. 8A is a top plan view showing the assembly of the backlight structure according to the first embodiment of the present invention.

Figure 8B is a schematic cross-sectional view showing the assembly of the backlight structure shown in Figure 8A.

FIG. 9 is a top plan view showing the final assembly cross section of the backlight structure according to the first embodiment of the present invention.

Figure 10 is a cross-sectional view showing a backlight structure of a second embodiment of the present invention.

Figure 11 is a cross-sectional view showing a backlight structure of a third embodiment of the present invention.

Figure 12 is a flow chart showing a method of fabricating a backlight structure in accordance with a third embodiment of the present invention.

FIG. 13 is a cross-sectional view showing the assembly of the backlight structure corresponding to step 300 and step 302 of the third embodiment of the present invention.

FIG. 14 is a schematic cross-sectional view showing the assembly of the backlight structure corresponding to step 304 of the third embodiment of the present invention.

Figure 15 is a cross-sectional view showing the assembly of the backlight structure corresponding to step 306 of the third embodiment of the present invention.

Figure 16 is a cross-sectional view showing the assembly of the backlight structure according to the third embodiment of the present invention.

Figure 17 is a cross-sectional view showing a backlight structure of a fourth embodiment of the present invention.

The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation. Please refer to FIG. 1. FIG. 1 is a schematic diagram of a backlit keyboard 3000 according to a first embodiment of the present invention. As shown in FIG. 1 , the backlight keyboard 3000 includes a keyboard portion 1 and a backlight structure 2 . The keyboard portion 1 is disposed on the backlight structure 2 , and the backlight structure 2 is configured to provide a light source of the keyboard portion 1 to cause the backlight keyboard 3000 to emit light. Visual effect.

Please refer to FIG. 1 , FIG. 2 , FIG. 3A and FIG. 3B , and FIG. 2 is the present invention. FIG. 3A is a partial cross-sectional view of the backlight structure 2 along the section line XX, and FIG. 3B is a part of the backlight structure 2 along the section line YY shown in FIG. 2; Schematic diagram of the section. As shown in FIG. 1 , FIG. 2 , FIG. 3A and FIG. 3B , the keyboard portion 1 of the backlit keyboard 3000 includes a bottom plate 10 and a plurality of buttons 11 , and a plurality of buttons 11 are disposed on the bottom plate 10 for use. The user presses to enable the user to perform a key input command, such as entering a text, a symbol, or a number. Further, the backlight structure 2 is disposed under the bottom plate 10 and includes a light guide plate 20, a light emitting unit 21, a reflective sheet 22, a first fluid cured layer 23, a first adhesive layer 24, and a second fluid cured layer 25. And a second adhesive layer 26, the light guide plate 20 has a light incident surface 201, a light exit surface 202, a bottom surface 203 and a side surface 204, wherein the bottom surface 203 is opposite to the light exit surface 202. The light emitting unit 21 is adjacent to the light incident surface 201, the light emitting unit 21 is configured to emit a light L, and the light guide plate 20 is used to guide the light L emitted by the light emitting unit 21, so that the light L emitted by the light emitting unit 21 passes through the light incident surface. After entering the light guide plate 20, the 201 can be emitted from the light exit surface 202 of the light guide plate 20.

In this way, the light L can be projected toward the bottom plate 10 of the keyboard portion 1 and the button 11, so that the backlight keyboard 3000 produces a light-emitting effect. Further, the reflection sheet 22 is disposed below the bottom surface 203 of the light guide plate 20. In practice, when the light L emitted from the light guide unit 20 is emitted from the light exit surface 202, a part of the light L is emitted from the bottom surface 203 of the light guide plate 20, and the reflection sheet 22 can be used to reflect the bottom surface 203. The emitted light L is directed to the light exiting surface 202 to concentrate the light L toward the bottom plate 10 of the keyboard portion 1 and the button 11, thereby increasing the light emitting effect of the backlit keyboard 3000.

In this embodiment, the backlight structure 2 can further include a mask 27 disposed on the light-emitting surface 202 of the light guide plate 20, that is, the mask 27 is located on the light guide plate 20 of the backlight structure 2 and the bottom plate 10 of the keyboard portion 1. The light-shielding region 271 has a light-transmissive region 271 and an opaque region 272. The light-transmitting region 271 can pass the light L emitted from the light-emitting surface 202 of the light guide plate 20, and the non-transparent region 272 can block The light L emitted from the light exit surface 202 of the light guide plate 20 passes. In other words, the backlight structure 2 can be designed by using the transparent region 271 and the opaque region 272 of the mask 27, so that the light L can only be transmitted through the transparent region 271 on the mask 27, thereby limiting the light guide plate 20. The light exit area. In practice, the light transmissive area 271 of the backlight structure 2 can correspond to the position of each button 11 of the keyboard portion 1 , thereby backlighting the keyboard 3000 The light beam L can be restricted from being projected by the lower side of the button 11 by the mask 27 to achieve the desired light emission effect.

As shown in FIG. 3A and FIG. 3B , the first fluid-cured layer 23 is disposed on the side surface 204 of the light guide plate 20 and covers the side surface 204 of the light guide plate 20 , wherein the first fluid-cured layer 23 is in an uncured state. flow. When the light guide L emitted from the light guide unit 20 is emitted from the light exit surface 202, a part of the light L is emitted from the side surface 204 of the light guide plate 20, and the first fluid solidified layer 23 can be used to block the light L from the side. The light is emitted from the side surface 204 of the light guide plate 20, thereby improving the problem of light leakage on the side of the light guide plate 20. In this embodiment, the first fluid-cured layer 23 can be made of an opaque ink material, and the first fluid-cured layer 23 can be formed on the side surface 204 of the light guide plate 20 by ink printing. The material of the first fluid-cured layer 23 of the present invention may not be limited to that described in this embodiment. For example, the first fluid-cured layer 23 may also be made of a semi-transparent ink material, and the above design is adopted, depending on actual needs. .

It is worth mentioning that the manner in which the first fluid-cured layer 23 is formed on the side surface 204 of the light guide plate 20 is not limited to the manner of ink printing. For example, the first fluid-cured layer 23 can also be formed on the side surface 204 of the light guide plate 20 by inkjet printing using an industrial inkjet machine; or the light guide plate 20 can be erected to make the light guide plate 20 Surrounding each other to dipping the pool filled with the first fluid-cured layer 23, and then placing the light guide plate 20 flat on the first adhesive layer 24; or using a slit head for slot coating The first fluid-cured layer 23 is applied around the periphery of the light guide plate 20; or the first fluid-cured layer 23 is coated around the periphery of the light guide plate 20 by a curtain coating in a curtain coating manner. In summary, the process of providing the first fluid-cured layer 23 to the edge of the reflective sheet 22 may be selected from the group consisting of inkjet, dip, slit, curtain, and printing processes. As for which of the above designs is adopted, it depends on actual needs.

In addition, the first adhesive layer 24 is adhered between the bottom surface 203 of the light guide plate 20 and the reflective sheet 22 . As described above, the first adhesive layer 24 can be bonded to the light guide plate 20 and the reflective sheet 22 to form a retaining wall structure, so that the first fluid cured layer 23 is disposed in the edge of the reflective sheet 22 and is in the uncured state. The first adhesive layer 24 (ie, the retaining wall structure) can be used to limit the first fluid solidified layer 23 The first fluid layer 23 can be disposed in the range between the reflective sheet 22 and the light guide plate 20, so that the first fluid cured layer 23 is disposed on the reflective sheet edge 221 of the reflective sheet 22 and adjacent to the side surface 204 of the light guide plate 20, that is, the first adhesive layer 24 can be The first fluid-cured layer 23 is prevented from excessively overflowing into the range between the reflective sheet 22 and the light guide plate 20, and the first fluid-cured layer 23 is restricted from being adjacent to the side surface 204 of the light guide plate 20 without covering the bottom surface 203 of the light guide plate 20. In this way, the reflection sheet 22 can reflect most of the light L emitted from the bottom surface 203 of the light guide plate 20, thereby maintaining the light-emitting quality of the backlight structure 2.

It is worth mentioning that the light-emitting surface 202 of the light guide plate 20 has a peripheral surface 2021 and a central light-emitting region 2022 (as shown in FIG. 3B ), and is formed on the first light-curing layer 23 by ink printing on the light guide plate 20 . During the process of the side surface 204, a fixture (not shown) may be used to limit the first fluid-cured layer 23 to only cover the peripheral surface 2021 without being applied to the central exit region 2022. In this way, the first fluid-cured layer 23 does not block the light L emitted from the central light-emitting region 2022 of the light-emitting surface 202 of the light guide plate 20. In practice, the jig can be a commonly used screen for screen printing, but the invention is not limited thereto.

Further, the first adhesive layer 24 has an outer side 241 , and the outer side 241 of the first adhesive layer 24 is adjacent to the side surface 204 of the light guide plate 20 . In addition, the first adhesive layer 24 further has an inner side 242, and the outer side 241 and the inner side 242 of the first adhesive layer 24 are spaced apart by a width W. In this embodiment, the width W may be 2 cm, but the invention is not limited thereto. In addition, the outer side 241 of the first adhesive layer 24 can exceed the side surface 204 of the light guide plate 20 , that is, the projection of the side surface 204 of the light guide plate 20 on the first adhesive layer 24 is located on the outer side 241 and the inner side 242 of the first adhesive layer 24 . Between (that is, the range covered by the width W).

In this embodiment, the shape of the reflective sheet 22 is substantially the same as the shape of the light guide plate 20, and the size of the reflective sheet 22 is larger than the size of the light guide plate 20. That is, the reflective sheet 22 has a reflective sheet edge 221. When the reflective sheet 22 is disposed under the bottom surface 203 of the light guide plate 20, the reflective sheet edge 221 extends from the side surface 204 of the light guide plate 20 to protrude by a specific distance D to provide a A first portion 231 of a fluid-cured layer 23 is located in the space on the reflective sheet 22. In practice, the specific distance D can be between 1.5 cm and 2 cm. In this embodiment, the second portion 232 of one of the first fluid cured layers 23 The first surface 231 of the first fluid-cured layer 23, the second portion 232, and a third portion 233 connecting the first portion 231 and the second portion 232 may be covered on the peripheral surface 2021 of the light-emitting surface 202 of the light guide plate 20. The side surface 204 of the light guide plate 20 may be coated together to improve the light leakage problem of the light L at the side surface 204 of the light guide plate 20.

As shown in FIG. 3A, a light guide plate 20 is formed with a through hole 205. The through hole 205 has a perforated side surface 2051, and the second fluid solidified layer 25 covers the perforated side surface 2051 of the through hole 205. When the second fluid-cured layer 25 is applied to the perforated side surface 2051 of the through hole 205, the second adhesive layer 26 can limit the range in which the second fluid-cured layer 25 can enter between the reflective sheet 22 and the light guide plate 20. When the light guide L emitted from the light guide unit 20 is emitted from the light exit surface 202, a part of the light L is emitted from the perforated side surface 2051 of the through hole 205 of the light guide plate 20, and the second fluid solidified layer 25 can be used for blocking. The light L is emitted by the perforated side surface 2051 of the through hole 205 to reduce the light L to form a bright spot at the perforated side surface 2051 of the through hole 205 of the light guide plate 20, thereby improving the appearance of the backlit keyboard 3000. The structural arrangement between the second fluid-cured layer 25 and the second adhesive layer 26 is the same as that of the first fluid-cured layer 23 and the first adhesive layer 24. For the sake of brevity, no further details are provided herein.

Referring to FIG. 4, FIG. 4 is a flow chart of a method for manufacturing the backlight structure 2 according to the first embodiment of the present invention, which includes the following steps:

Step 100: Preparing the light guide plate 20.

Step 102: Prepare a reflective sheet 22.

Step 104: Bonding the light guide plate 20 to the reflective sheet 22 using the first adhesive layer 24 and the second adhesive layer 26, wherein the reflective sheet edge 221 extends from the side surface 204 by a certain distance D.

Step 106: A first fluid-cured layer 23 is disposed at the edge 221 of the reflective sheet and adjacent to the side 204 of the light guide plate 20, and a second fluid-cured layer 25 is disposed on the perforated side 2051 of the through-hole 205.

Hereinafter, a method of manufacturing the backlight structure 2 will be described in detail. Please refer to FIG. 5A, FIG. 5B, FIG. 6A, FIG. 6B, FIG. 7A, FIG. 7B, FIG. 8A, FIG. 8B, and ninth. 5A is a top plan view showing the assembly of the backlight structure 2 corresponding to the step 100 and the step 102 in the first embodiment of the present invention, and FIG. 5B is an assembly sectional view showing the backlight structure 2 shown in FIG. 5A. 6A is a schematic top view of the assembly of the backlight structure 2 corresponding to the step 104 of the first embodiment of the present invention, and FIG. 6B is a schematic cross-sectional view of the backlight structure 2 of the 6A, and FIG. 7A is a first embodiment of the present invention. FIG. 7B is an assembled cross-sectional view of the backlight structure 2 shown in FIG. 7A, and FIG. 8A is a schematic top view of the assembled backlight structure 2 according to the first embodiment of the present invention, FIG. 8B FIG. 8 is a schematic cross-sectional view showing the assembled structure of the backlight structure 2 shown in FIG. 8A, and FIG. 9 is a schematic cross-sectional view showing the final assembly of the backlight structure 2 according to the first embodiment of the present invention.

As shown in FIG. 5A and FIG. 5B, the reflective sheet 22 and the light guide plate 20 may be prepared first (step 100 and step 102), wherein the light guide plate 20 has a light guide plate outer circumference 206 and a shape formed along the edge of the through hole 205. The inner periphery of the light guide plate 207. As shown in FIG. 6A and FIG. 6B , the first adhesive layer 24 is continuously disposed along the outer circumference 206 of the light guide plate, and the second adhesive layer 26 is continuously disposed along the circumference of the inner circumference 207 of the light guide plate, thereby the light guide plate 20 can be The first adhesive layer 24 defines an inner region 208 and an outer region 209 is defined by the second adhesive layer 26, and then the first adhesive layer 24 and the second adhesive layer 26 are used to bond the light guide plate 20 to the reflective sheet 22 ( Step 104). It is to be noted that, since the size of the reflective sheet 22 is larger than the size of the light guide plate 20, when the light guide plate 20 is adhered to the reflective sheet 22, the reflective sheet edge 221 of the reflective sheet 22 can extend from the side surface 204 of the light guide plate 20. A specific distance D'. In practice, the specific distance D' may be 7 cm, but the invention is not limited thereto.

As shown in FIG. 7A and FIG. 7B, the first fluid-cured layer 23 is disposed on the reflective sheet edge 221 of the reflective sheet 22 and adjacent to the side surface 204 of the light guide plate 20, so that the first fluid-cured layer 23 is coated outside the light guide plate. A peripheral edge 206, and a second fluid-cured layer 25 is disposed on the perforated side 2051 of the perforation 205 (step 106) to apply the second fluid-cured layer 25 to the inner periphery 207 of the light guide. It is worth mentioning that when the first fluid-cured layer 23 is disposed in the outer periphery 206 of the light guide plate and is in the uncured state, the first adhesive layer 24 can be used to block the first fluid-cured layer 23, so that the first The fluid cured layer 23 is confined outside of the inner region 208. On the other hand, when the second fluid-cured layer 25 is disposed in the inner peripheral edge 207 of the light guide plate and is in the uncured state, the second adhesive layer 26 can be used to block the second fluid-cured layer 25 to solidify the second fluid. Layer 25 is confined outside of outer region 209.

As shown in FIG. 8A and FIG. 8B, the first side 204 of the light guide plate 20 is provided with the first After the fluid-cured layer 23 and the second fluid-cured layer 25 are disposed at the edge of the through-hole 205, the first fluid-cured layer 23 and the second fluid-cured layer 25 may be baked to cure the first fluid-cured layer 23 and the second fluid. The layer 25 is cured. After the first fluid-cured layer 23 and the second fluid-cured layer 25 are cured, the reflective sheet 22 and the light guide plate 20 may be further cut to remove part of the first fluid-cured layer 23 and the second fluid-cured layer 25, so that The perforations 205 remain therethrough without being blocked by the second fluid-cured layer 25. Then, the mask 27 is adhered to the light guide plate 20, and the opaque region 272 (hatched pattern region) of the mask 27 covers the boundary between the first fluid-cured layer 23 and the light guide plate 20. (As shown in FIG. 9), the light-emitting unit 21 is finally disposed on one side of the light guide plate 20 and adjacent to the light-incident surface 201 of the light guide plate 20 (as shown in FIG. 3). In this way, the assembly of the backlight structure 2 can be completed.

Please refer to FIG. 10, which is a cross-sectional view of a backlight structure 2' according to a second embodiment of the present invention. As shown in FIG. 10 , the main difference between the backlight structure 2 ′ and the backlight structure 2 described above is that an outer side 241 ′ of a first adhesive layer 24 ′ of the backlight structure 2 ′ does not exceed the side surface 204 of the light guide plate 20 , and That is, in this embodiment, the outer side 241' of the first adhesive layer 24' and the inner side 242' may be separated by a width W', wherein the width W' may be 0.5 cm, and the outer side 241' of the first adhesive layer 24' The projection of the side surface 204 of the light guide plate 20, that is, the side surface 204 of the light guide plate 20 on the first adhesive layer 24' is outside the range covered by the width W' of the first adhesive layer 24'. As described above, since the outer side 241 ′ of the first adhesive layer 24 ′ does not exceed the side surface 204 of the light guide plate 20 , when the first adhesive layer 24 ′ is bonded to the light guide plate 20 and the reflective sheet 22 , the first adhesive layer 24 ′ The outer side 241 ′, the light guide plate 20 and the reflective sheet 22 may define a first infiltration space S1 , and the first portion 231 of the first fluid solid layer 23 may enter the first infiltration space S1 during the setting process. The components of the embodiment having the same reference numerals as in the above embodiments have the same structural design and function principle, and are not described herein for brevity.

Please refer to FIG. 11. FIG. 11 is a cross-sectional view showing a backlight structure 2" according to a third embodiment of the present invention. As shown in FIG. 11, the main difference between the backlight structure 2" and the back backlight structure 2 described above is that the backlight The structure 2" does not have the reflective sheet 22 but includes a reflective layer 28, and the reflective layer 28 is applied to the bottom surface 203 of the light guide plate 20. The reflective layer 28 reflects the light L emitted from the bottom surface 203, and the first fluid solidified layer 23 covers The reflective layer 28 is at the junction with the light guide plate 20, and the first fluid solidified layer 23 is oriented The structure of the bottom surface of the reflective layer 28 is not limited to the embodiment of the present invention, that is, the backlight structure 2" can selectively include the reflective sheet 22 or the reflective layer 28, The design of the above is based on the actual needs. In addition, the first adhesive layer 24 of the backlight structure 2" is bonded between the light-emitting surface 202 of the light guide plate 20 and the mask 27. In other words, the backlight structure 2" does not have a reflective sheet structure, so the light guide plate 20 of the backlight structure 2" is bonded to the mask 27, and its structural configuration is bonded to the light guide plate 20 of the backlight structure 2 described above to the reflective sheet 22. The structure of the configuration is different. In this embodiment, the size of the mask 27 is larger than the size of the light guide plate 20, and the mask 27 has a mask edge 273. When the first adhesive layer 24 is bonded to the light guide plate 20 and the mask 27, the mask edge 273 Extending from the side 204 a specific distance D".

As described above, the first adhesive layer 24 of the backlight structure 2" can be adhered to the light guide plate 20 and the mask 27 to form a retaining wall structure. Therefore, the first fluid cured layer 23 is disposed on the side surface 204 of the light guide plate 20. When in the uncured state, the first adhesive layer 24 (ie, the retaining wall structure) can be used to limit the range between the first fluid curing layer 23 and the light shielding plate 20 to make the first fluid The cured layer 23 is disposed on the mask edge 273 of the mask 27 and adjacent to the side surface 204 of the light guide plate 20, that is, the first adhesive layer 24 prevents the first fluid solidified layer 23 from excessively overflowing between the mask 27 and the light guide plate 20. The first fluid-cured layer 23 is disposed adjacent to the side surface 204 of the light guide plate 20 without covering the light-emitting surface 202 of the light guide plate 20, so that the light-emitting surface 202 of the light guide plate 20 can transmit most of the light L. Further, the light-emitting quality of the backlight structure 2" is maintained.

It is worth mentioning that the bottom surface 203 of the light guide plate 20 has a peripheral bottom surface 2031 and a central reflection area 2032 (as shown in FIG. 11). During the setting process of the first fluid solid layer 23, a jig can be utilized ( Not shown in the drawings) the first fluid-cured layer 23 is limited to cover only the peripheral bottom surface 2031 and is not applied to the central reflective region 2032. In this way, the first fluid-cured layer 23 does not block the central reflection region 2032 of the bottom surface 203 of the light guide plate 20, so that the reflection sheet 22 or the reflection layer 28 can reflect most of the light L. In practice, the jig can be a grid structure, but the invention is not limited thereto.

It is worth mentioning that the outer side 241 and the inner side of the first adhesive layer 24 of the backlight structure 2" 242 may have a width W", wherein the width W" may be 2 cm, and the outer side 241 of the first adhesive layer 24 may exceed the side surface 204 of the light guide plate 20, that is, the side surface 204 of the light guide plate 20 is on the first adhesive layer 24. The projection system is located within the range of the width W" (ie, 2 cm) of the first adhesive layer 24. The components of the embodiment having the same reference numerals as in the above embodiments have the same structural design and operation principle. Seeking simplicity, I won't go into details here.

Referring to FIG. 12, FIG. 12 is a flowchart of a method for manufacturing a backlight structure 2" according to a third embodiment of the present invention, which includes the following steps:

Step 300: Preparing the light guide plate 20.

Step 302: Prepare a mask 27.

Step 304: Bonding the light guide plate 20 to the mask 27 using the first adhesive layer 24 and the second adhesive layer 26, wherein the mask edge 273 extends from the side surface 204 by a certain distance D".

Step 306: The first fluid-cured layer 23 is disposed at the edge of the mask edge 273 and adjacent to the side surface 204 of the light guide plate 20, and the second fluid-cured layer 25 is disposed on the perforated side surface 2051 of the through hole 205.

The following is a detailed description of the manufacturing method of the backlight structure 2". Please refer to FIG. 13 to FIG. 16 together. FIG. 13 is a schematic cross-sectional view showing the assembly of the backlight structure 2" corresponding to step 300 and step 302 according to the third embodiment of the present invention. Figure 14 is a cross-sectional view showing the assembly of the backlight structure 2" corresponding to the step 304 of the third embodiment of the present invention, and Figure 15 is a schematic cross-sectional view showing the assembly of the backlight structure 2" corresponding to the step 306 of the third embodiment of the present invention. Third Embodiment Backlight Structure 2" completed assembly cross-sectional view.

As shown in Fig. 13, the mask 27 and the light guide plate 20 can be prepared first (steps 300 and 302). As shown in FIG. 14, the first adhesive layer 24 and the second adhesive layer 26 are used to bond the light guide plate 20 to the mask 27 (step 304). As shown in FIG. 15, the first fluid-cured layer 23 is provided on (1) the side surface 204 of the light guide plate 20, (2) the boundary between the reflective layer 28 and the light guide plate 20, and (3) the outer periphery of the bottom surface of the reflective layer 28, and A second fluid-cured layer 25 is disposed at the edge of the perforation 205 (step 306). As shown in FIG. 16, the first fluid solidified layer 23 is disposed on the side surface 204 of the light guide plate 20 and at the edge of the through hole 205. After the second fluid-cured layer 25 is disposed, the first fluid-cured layer 23 and the second fluid-cured layer 25 may be baked to cure the first fluid-cured layer 23 and the second fluid-cured layer 25. After the first fluid-cured layer 23 and the second fluid-cured layer 25 are cured, the reflective layer 28 and the light guide plate 20 may be further cut to remove the excess first fluid-cured layer 23 and the second fluid-cured layer 25, and finally The light emitting unit 21 is disposed on one side of the light guide plate 20 and adjacent to the light incident surface 201 of the light guide plate 20 (as shown in FIG. 11). In this way, the assembly of the backlight structure 2" can be completed.

Referring to FIG. 17, FIG. 17 is a cross-sectional view showing a backlight structure 2'' of a fourth embodiment of the present invention. As shown in FIG. 17, the main difference between the backlight structure 2''' and the backlight structure 2" described above is that an outer side 241" of a first adhesive layer 24" of the backlight structure 2"" does not exceed the light guide plate 20. The side surface 204, that is, in this embodiment, the outer side 241" of the first adhesive layer 24" and the inner side 242" can be separated by a width W"", wherein the width W"" can be 0.5 cm, and the The outer side 241" of the adhesive layer 24" does not exceed the side surface 204 of the light guide plate 20, that is, the projection of the side surface 204 of the light guide plate 20 on the first adhesive layer 24" is located at the width W"' of the first adhesive layer 24". Beyond the scope covered. As described above, since the outer side 241" of the first adhesive layer 24" does not exceed the side surface 204 of the light guide plate 20, when the first adhesive layer 24" is bonded to the light guide plate 20 and the reflective sheet 22, the first adhesive layer 24" The outer side 241", the light guide plate 20 and the reflective sheet 22 can jointly define a second infiltration space S2, and the second portion 232 of the first fluid solidified layer 23 can enter the second infiltration space S2 during the setting process. In this embodiment, the backlight structure 2 ′′′ includes a reflective sheet 22 , and the structure for reflecting light in the present invention is not limited to the embodiment of the embodiment, that is, the backlight structure 2 ′′′ is selectable. The reflective sheet 22 or the reflective layer 28 is included, and the design of the above embodiment is based on the actual requirements. The components of the embodiment having the same reference numerals as in the above embodiments have the same structural design and function principle. Seeking simplicity, I won't go into details here.

Compared with the prior art, the present invention can utilize a reflective sheet or a mask as a substrate, and another adhesive layer is used to adhere the light guide plate to the substrate (ie, a reflective sheet or a mask) to provide a fluid curing layer disposed on the substrate. The edge of the light plate or the edge of the hole on the light guide plate, whereby the fluid solidified layer can be disposed on the edge of the light guide plate or the edge of the hole on the light guide plate, thereby blocking the light from being emitted from the edge of the light guide plate or the edge of the hole on the light guide plate, thereby Improve the problem of light leakage on the side or hole of the light guide. The above is only this The preferred variations and modifications of the invention are intended to be within the scope of the invention.

2‧‧‧Backlight structure

20‧‧‧Light guide

202‧‧‧Glossy surface

2021‧‧‧ peripheral surface

2022‧‧‧Central light exit area

203‧‧‧ bottom

204‧‧‧ side

22‧‧‧reflector

221‧‧‧reflector edge

23‧‧‧First fluid solidified layer

231‧‧‧Part 1

232‧‧‧Part II

233‧‧‧Part III

24‧‧‧First adhesive layer

241‧‧‧ outside

242‧‧‧ inside

27‧‧‧Mask

271‧‧‧Light transmission area

272‧‧‧Opacity zone

D‧‧‧Specific distance

W‧‧‧Width

Claims (43)

A backlight structure suitable for an illuminated keyboard, comprising: a light guide plate having a light incident surface, a light exiting surface, a bottom surface and a side surface opposite to the light emitting surface; and a light emitting unit adjacent to the light incident surface, the light emitting unit One of the light emitted by the light-emitting unit enters the light guide plate through the light-incident surface and is emitted from the light-emitting surface; a reflective sheet is disposed under the bottom surface, and the reflective sheet is for reflecting the light emitted from the bottom surface, the reflective sheet The size of the reflector is larger than the size of the light guide plate. The reflective sheet has a reflective sheet edge extending from the side surface by a specific distance; a first adhesive layer is adhered between the bottom surface and the reflective sheet; and a first fluid is cured. a layer disposed at an edge of the reflective sheet adjacent to the side surface, the first fluid-cured layer is configured to block the light from being emitted through the side surface, and the first fluid-cured layer is flowable in an uncured state; The first adhesive layer limits the flow of the first fluid-cured layer into the reflective sheet and the light guide when a fluid-cured layer is disposed in the edge of the reflective sheet and is in the uncured state. Range between. The backlight structure of claim 1, wherein the first adhesive layer has an outer side, and the outer side of the first adhesive layer is adjacent to the side of the light guide plate. The backlight structure of claim 2, wherein the outer side of the first adhesive layer exceeds the side. The backlight structure of claim 2, wherein the outer side of the first adhesive layer does not exceed the side surface, and the outer surface of the first adhesive layer defines a first infiltration space together with the reflective sheet. A fluid cured layer portion enters the first infiltration space. The backlight structure of claim 2, wherein the first adhesive layer has an inner side, the outer side and the outer layer The inner side is spaced apart by a width and the width is between 0.5 cm and 2 cm. The backlight structure of claim 1, wherein the light-emitting surface has a peripheral surface and a central light-emitting region, wherein the first fluid is restricted by the fixture when the first fluid-cured layer is disposed to the edge of the reflective sheet The cured layer covers only the peripheral surface and is not applied to the central exit region. The backlight structure of claim 1, wherein the light guide plate has a through hole, the through hole has a perforated side, and the backlight structure further comprises: a second fluid solidified layer covering the side of the through hole. The backlight structure of claim 1, further comprising: a mask disposed on the light-emitting surface, the mask having at least one light-transmitting region and an opaque region to limit a light-emitting region of the light guide plate, The opaque region covers a boundary between the first fluid-cured layer and the light guide plate. The backlight structure of claim 1, wherein the process of providing the first fluid-cured layer to the edge of the reflective sheet is selected from the group consisting of inkjet, dip, slit, curtain, and printing processes. The backlight structure of claim 1, wherein the light guide plate has an outer peripheral edge of the light guide plate, and the first adhesive layer is continuously disposed along the outer circumference of the light guide plate to define an inner region, when the first fluid solidified layer is coated. When the light guide plate is on the side of the light guide plate, the first adhesive layer blocks the first fluid solidified layer, so that the first fluid solidified layer cannot enter the inner region. The backlight structure of claim 1, wherein the light guide plate has a perforation, the perforation has a perforated side, the light guide plate defines a inner periphery of the light guide plate along the edge of the perforation, and the backlight structure further comprises: a second adhesive layer is continuously disposed along the inner circumference of the light guide plate to define an outer region; and a second fluid solidified layer is coated on the side of the perforation, when the second fluid solidified layer is coated on the side of the perforation The second adhesive layer blocks the second fluid solidified layer to cure the second fluid The layer cannot enter the outer area. A method for manufacturing a backlight structure of an illuminated keyboard, comprising the steps of: (a) preparing a light guide plate having a light exit surface, a bottom surface and a side surface; (b) preparing a reflective sheet, the reflective sheet having a size larger than the a light guide plate having a reflective sheet edge; (c) bonding the light guide plate to the reflective sheet by using a first adhesive layer, wherein the first adhesive layer is located between the bottom surface and the reflective sheet, the reflection Extending a certain distance from the side surface; and (d) providing a first fluid-cured layer adjacent to the edge of the reflective sheet and adjacent to the side surface, and the first adhesive layer restricting the first fluid-solidified layer from flowing into the The range between the reflective sheet and the light guide plate. The manufacturing method of claim 12, wherein the first adhesive layer has an outer side, and the outer side of the first adhesive layer is adjacent to the side of the light guide plate. The manufacturing method of claim 13, wherein the outer side of the first adhesive layer exceeds the side surface. The manufacturing method of claim 13, wherein the outer side of the first adhesive layer does not exceed the side surface, the outer side of the first adhesive layer, the light guide plate and the reflective sheet together define a first infiltration space, in the step In (d), the first fluid-cured layer portion enters the first infiltration space. The manufacturing method of claim 12, wherein the light-emitting surface has a peripheral surface and a central light-emitting region, wherein in step (d), the fixture is used to restrict the first fluid-cured layer from covering only the peripheral surface, and Will not be applied to the central light exit area. The manufacturing method of claim 12, wherein the light guide plate has a perforation, the perforation having A perforated side, and step (d) further comprises the step of providing a second fluid-cured layer on the side of the perforation. The manufacturing method of claim 17, wherein the step (d) further comprises the steps of: baking the second fluid solidified layer, and then removing a portion of the second fluid solidified layer to keep the perforation through without being affected by the second fluid The cured layer is blocked. The method of claim 12, wherein the step (d) further comprises the steps of: baking the first fluid-cured layer, and then removing a portion of the first fluid-cured layer and a portion of the reflective sheet to cause the first fluid-cured layer The outer edge is substantially aligned with the edge of the reflective sheet. The manufacturing method of claim 12, wherein the light guide plate has an outer periphery of the light guide plate, and the step (c) further comprises the step of: defining the first adhesive layer continuously along the outer circumference of the light guide plate to define an inner region; And in the step (d), the first adhesive layer blocks the first fluid-cured layer such that the first fluid-cured layer cannot enter the inner region. The manufacturing method of claim 12, wherein the light guide plate has a perforation, the perforation has a perforated side, the light guide plate forms an inner periphery of the light guide plate along the edge of the perforation, and the step (c) further comprises the following steps: a second adhesive layer is continuously disposed along the inner circumference of the light guide plate to define an outer region; and in the step (d), the first adhesive layer blocks the first fluid solidified layer, so that the first fluid solidified layer cannot enter The outer area. A backlight structure suitable for an illuminated keyboard, comprising: a light guide plate having a light incident surface, a light exiting surface, a bottom surface and a side surface opposite to the light emitting surface; a light-emitting unit adjacent to the light-incident surface, wherein a light emitted by the light-emitting unit enters the light guide plate through the light-incident surface and is emitted from the light-emitting surface; a mask is disposed on the light-emitting surface, and the reflective sheet is used for the reflective sheet To limit the light exiting area of the light guide plate, the size of the mask is larger than the size of the light guide plate, the mask has a matte edge, the edge of the mask extends from the side to protrude a certain distance; a first adhesive layer is adhered to the light And a first fluid-cured layer disposed at an edge of the mask and adjacent to the side surface, the first fluid-cured layer is configured to block the light from being emitted through the side, the first fluid-solidified layer being The uncured state is flowable; wherein the first adhesive layer limits the flow of the first fluid-cure layer into the mask when the first fluid-cured layer is disposed to the edge of the mask and is in the uncured state The range between the light guide plate and the light guide plate. The backlight structure of claim 22, wherein the first adhesive layer has an outer side, and the outer side of the adhesive layer is adjacent to the side of the light guide plate. The backlight structure of claim 23, wherein the outer side of the first adhesive layer exceeds the side. The backlight structure of claim 23, wherein the outer side of the first adhesive layer does not exceed the side surface, and the light-emitting surface of the light guide plate and the mask jointly define a second infiltration space. The first fluid cured layer portion enters the second infiltration space. The backlight structure of claim 23, wherein the first adhesive layer has an inner side, the outer side and the inner side are spaced apart by a width, and the width is between 0.5 mm and 2 mm. The backlight structure of claim 22, wherein the bottom surface has a peripheral bottom surface and a central reflection a region, wherein during the setting of the first fluid-cured layer, the fixture is used to restrict the first fluid-cured layer from covering only the bottom surface of the circumference without being applied to the central reflection region. The backlight structure of claim 22, wherein the light guide plate has a through hole, the through hole has a perforated side, and the backlight structure: a second fluid solidified layer covering the side of the through hole. The backlight structure of claim 22, wherein the process of providing the first fluid-cured layer to the edge of the reflective sheet is selected from the group consisting of inkjet, dip, slit, curtain, and printing processes. The backlight structure of claim 22, further comprising: a reflective layer coated on the bottom surface of the light guide plate, the reflective layer for reflecting the light emitted from the bottom surface, the first fluid cured layer covering the The reflective layer interfaces with the light guide plate and extends to the periphery of the bottom surface of the reflective layer. The backlight structure of claim 22, wherein the light guide plate has an outer periphery of the light guide plate, and the first adhesive layer is continuously disposed along the outer circumference of the light guide plate to define an inner region, when the first fluid solidified layer is coated. When the light guide plate is on the side of the light guide plate, the first adhesive layer blocks the first fluid solidified layer, so that the first fluid solidified layer cannot enter the inner region. The backlight structure of claim 22, wherein the light guide plate has a perforation, the perforation has a perforated side, the light guide plate defines a inner periphery of the light guide plate along the edge of the perforation, and the backlight structure further comprises: a second adhesive layer is continuously disposed along the inner circumference of the light guide plate to define an outer region; and a second fluid solidified layer is coated on the side of the perforation, when the second fluid solidified layer is coated on the side of the perforation The second adhesive layer blocks the second fluid solidified layer to cure the second fluid The layer cannot enter the outer area. A method for manufacturing a backlight structure of an illuminated keyboard, comprising the steps of: (a) preparing a light guide plate having a light emitting surface and a side surface; and (b) preparing a mask having a size larger than the light guide plate. The mask has a matte edge; (c) the light guide is bonded to the mask by using a first adhesive layer, wherein the first adhesive layer is located between the light emitting surface and the mask, and the edge of the mask Extending from the side surface by a specific distance; and (d) providing a first fluid-cured layer adjacent to the edge of the mask and adjacent to the side surface, and the first adhesive layer restricting the first fluid-solidified layer from flowing into the mask The range between the light guide plate and the light guide plate. The manufacturing method of claim 33, wherein the first adhesive layer has an outer side, and the outer side of the first adhesive layer is adjacent to the side of the light guide plate. The manufacturing method of claim 34, wherein the outer side of the first adhesive layer exceeds the side surface. The manufacturing method of claim 34, wherein the outer side of the first adhesive layer does not exceed the side surface, and the outer side of the first adhesive layer, the light guide plate and the cover sheet together define a second infiltration space, in the step ( In d), the first fluid solidified layer partially enters the second infiltration space. The manufacturing method of claim 33, wherein the bottom surface has a peripheral bottom surface and a central reflection area, wherein in step (d), the fixture is used to restrict the first fluid-cured layer from covering only the bottom surface of the circumference, instead of Will be applied to the central reflection zone. The manufacturing method of claim 33, wherein the light guide plate has a perforation having a perforated side, and the method (d) comprises the step of disposing a second fluid-cured layer on the side of the perforation. The method of claim 38, wherein the step (d) comprises the steps of: baking the second fluid-cured layer, and then removing a portion of the second fluid-cure layer to maintain the perforation through without being cured by the second fluid The layer is blocked. The method of claim 33, wherein the step (d) further comprises the steps of: baking the first fluid-cured layer, and then removing a portion of the first fluid-cured layer and a portion of the mask to cause the first fluid-cured layer The outer edge substantially aligns the edge of the matte. The method of claim 33, wherein the light guide plate has an outer periphery of the light guide plate, and the step (c) further comprises the step of: defining the first adhesive layer continuously along the outer circumference of the light guide plate to define an inner region; And in the step (d), the first adhesive layer blocks the first fluid-cured layer such that the first fluid-cured layer cannot enter the inner region. The manufacturing method of claim 33, wherein the light guide plate has a through hole having a perforated side surface, the light guide plate is formed with an inner circumference of the light guide plate along an edge of the perforation, and the step (c) comprises the following steps: The second adhesive layer is continuously disposed along the inner circumference of the light guide plate to define an outer region; and in the step (d), the first adhesive layer blocks the first fluid solidified layer, so that the first fluid solidified layer cannot enter the Outer area. The method of claim 33, wherein the light guide plate further comprises a bottom surface opposite to the light exit surface, the step (a) further comprises the steps of: coating a reflective layer on the bottom surface; and step (d) further comprises: simultaneously setting The first fluid-cured layer is at a boundary between the reflective layer and the light guide plate and a bottom surface of the reflective layer.