Backlight module

Abstract

A backlight module comprises a base layer, first and second light barriers, first, second and third light guide sheets, and first and second anti-dazzling screens. The base layer has first, second and third openings. The first light insulation sheet is arranged above the base layer and is provided with a first light insulation area, a second light insulation area and a fourth opening. The first light guide sheet is arranged in the first light isolation area. The second light guide sheet is arranged in the second light isolation area. The first light shielding sheet is arranged above the first light shielding sheet and is provided with a first light inlet window, a second light inlet window and a fifth opening. The third opening, the fourth opening and the fifth opening are correspondingly arranged. The second light shielding sheet is arranged above the first light shielding sheet and is provided with a third light shielding area. The third light guide sheet is arranged in the third light isolation area. The second light shielding sheet is arranged above the second light shielding sheet and is provided with a third light inlet window, a fourth light inlet window and a fifth light inlet window. Therefore, only a double-layer light guide structure is needed, and three display lighting effects can be independently presented in a limited occupied area.

Description

Technical Field

[0001] The present disclosure relates to a backlight module. Background Art

[0002] The Touch Function Row (TFR) module is a new touch application that replaces the physical function keys on the keyboard. It is basically a combination of a "touch panel" and a "backlight module". The TFR module includes a printed circuit board, a reflective sheet, a light guide plate, a light isolation structure, and an exterior sheet from bottom to top. Each layer is usually bonded to each other with water glue. The TFR module has two modes, one is a functional mode that replaces the physical function keys, and the other is a media mode that replaces the physical keys for controlling and adjusting the media keys. Both of the above modes allow users to use the TFR module to achieve the functions originally on the physical keys.

[0003] However, when a user's finger touches any icon, since all icons on the TFR module need to be arranged at equal distances, any icon may be smaller than the finger, resulting in the user being unable to immediately know whether the correct icon is being pressed when touching or pressing.

[0004] Therefore, how to propose a backlight module that can solve the above problems is one of the problems that the industry is eager to invest research and development resources to solve. Summary of the invention

[0005] In view of this, an object of the present disclosure is to provide a backlight module that can solve the above problems.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the present disclosure provides a backlight module, which includes a base layer, a first light partition, a first light guide, a second light guide, a first light shielding plate, a second light partition, a third light guide and a second light shielding plate. The base layer has a first opening, a second opening and a third opening. The first light partition is arranged above the base layer and has a first light partition area, a second light partition area and a fourth opening. The first light guide is arranged in the first light partition area. The second light guide is arranged in the second light partition area. The first light shielding plate is arranged above the first light partition and has a first light-transmitting window, a second light-transmitting window and a fifth opening. The third opening, the fourth opening and the fifth opening are arranged correspondingly. The second light partition is arranged above the first light shielding plate and has a third light partition area. The third light guide is arranged in the third light partition area. The second light shielding plate is arranged above the second light partition and has a third light-transmitting window, a fourth light-transmitting window and a fifth light-transmitting window. The first light-transmitting window and the third light-transmitting window are arranged correspondingly to form a first light exit path. The second light-transmitting window and the fourth light-transmitting window are arranged correspondingly to form a second light-emitting path. The fifth light-transmitting window forms a third light-emitting path.

[0007] In one or more embodiments of the present disclosure, the first light guide has a first microstructure group. The first microstructure group is correspondingly arranged with the first light-transmitting window and the third light-transmitting window to form a first light-exiting path. The second light guide has a second microstructure group. The second microstructure group is correspondingly arranged with the second light-transmitting window and the fourth light-transmitting window to form a second light-exiting path. The third light guide has a third microstructure group. The third microstructure group is correspondingly arranged with the fifth light-transmitting window to form a third light-exiting path.

[0008] In one or more embodiments of the present disclosure, at least one of the first light-isolating region, the second light-isolating region, and the third light-isolating region is a through hole or a notch.

[0009] In one or more embodiments of the present disclosure, the backlight module further includes a circuit board. The circuit board is disposed below the substrate and has a first light-emitting element, a second light-emitting element, and a third light-emitting element. The first light-emitting element passes through the first opening and is opposite to the side surface of the first light guide. The second light-emitting element passes through the second opening and is opposite to the side surface of the second light guide. The third light-emitting element passes through the third opening, the fourth opening, and the fifth opening in sequence and is opposite to the side surface of the third light guide.

[0010] In one or more embodiments of the present disclosure, the backlight module further includes a cover plate. The cover plate has a first light-transmitting portion, a second light-transmitting portion, and a third light-transmitting portion. The light emitted by the first light-emitting element reaches the first light-transmitting portion via the first light-emitting path. The light emitted by the second light-emitting element reaches the second light-transmitting portion via the second light-emitting path. The light emitted by the third light-emitting element reaches the third light-transmitting portion via the third light-emitting path.

[0011] In one or more embodiments of the present disclosure, any one of the first light-transmitting portion, the second light-transmitting portion, and the third light-transmitting portion is a graphic, a symbol, a text, or a combination thereof.

[0012] In one or more embodiments of the present disclosure, the first light-transmitting portion and the second light-transmitting portion are arranged along a first direction, and the third light-transmitting portion is opposite to the first light-transmitting portion and the second light-transmitting portion in a second direction perpendicular to the first direction.

[0013] In order to achieve the above-mentioned purpose, the embodiment of the present disclosure provides a backlight module, which includes a base layer, a first light partition, a first light guide, a first light shielding plate, a second light partition, a second light guide, a third light guide and a second light shielding plate. The base layer has an opening. The first light partition is arranged above the base layer and has a first light partition area. The first light guide is arranged in the first light partition area. The first light shielding plate is arranged above the first light partition and has a first light-transmitting window. The second light partition is arranged above the first light shielding plate and has a second light partition area and a third light partition area. The second light guide is arranged in the second light partition area. The third light guide is arranged in the third light partition area. The second light shielding plate is arranged above the second light partition and has a second light-transmitting window, a third light-transmitting window and a fourth light-transmitting window. The first light-transmitting window and the second light-transmitting window are arranged correspondingly to form a first light exit path. The third light-transmitting window forms a second light exit path. The fourth light-transmitting window forms a third light exit path.

[0014] In one or more embodiments of the present disclosure, the first light guide has a first microstructure group. The first microstructure group is correspondingly arranged with the first light-transmitting window and the second light-transmitting window to form a first light-exiting path. The second light guide has a second microstructure group. The second microstructure group is correspondingly arranged with the third light-transmitting window to form a second light-exiting path. The third light guide has a third microstructure group. The third microstructure group is correspondingly arranged with the fourth light-transmitting window to form a third light-exiting path.

[0015] In one or more embodiments of the present disclosure, at least one of the second light-isolating region and the third light-isolating region is a through hole or a notch.

[0016] In one or more embodiments of the present disclosure, the backlight module further includes a circuit board. The circuit board is disposed below the base layer and has a first light-emitting element, a second light-emitting element, and a third light-emitting element. The first light-emitting element passes through the opening and is opposite to the side surface of the first light guide. The second light-emitting element is laterally located on the same side of the base layer, the first light-spacer, the first light-shielding plate, and the second light-spacer and is opposite to the side surface of the second light guide. The third light-emitting element is laterally located on the same side of the base layer, the first light-spacer, the first light-shielding plate, and the second light-spacer and is opposite to the side surface of the third light guide.

[0017] In one or more embodiments of the present disclosure, the backlight module further includes a cover plate. The cover plate has a first light-transmitting portion, a second light-transmitting portion, and a third light-transmitting portion. The light emitted by the first light-emitting element reaches the third light-transmitting portion via the first light-emitting path. The light emitted by the second light-emitting element reaches the first light-transmitting portion via the second light-emitting path. The light emitted by the third light-emitting element reaches the second light-transmitting portion via the third light-emitting path.

[0018] In one or more embodiments of the present disclosure, any one of the first light-transmitting portion, the second light-transmitting portion, and the third light-transmitting portion is a graphic, a symbol, a text, or a combination thereof.

[0019] In one or more embodiments of the present disclosure, the first light-transmitting portion and the second light-transmitting portion are arranged along a first direction, and the third light-transmitting portion is opposite to the first light-transmitting portion and the second light-transmitting portion in a second direction perpendicular to the first direction.

[0020] In summary, the backlight module disclosed in the present invention mainly adopts a double-layer light guide structure, in which at least one of the three light output paths passes through two light guide layers at the same time. In this way, the backlight module disclosed in the present invention only needs a double-layer light guide structure to independently present three display light effects within a limited footprint. Further, the two light output paths emit light from the first light-transmitting portion and the second light-transmitting portion of the cover plate, respectively, to respectively produce two key mode (for example, functional mode and entertainment mode) light effects, and the third light output path emits light from the third light-transmitting portion of the cover plate, to produce a prompt light effect. In the implementation of the backlight module integrating the touch function, the third light-transmitting portion can be designed to emit light synchronously when the user's finger touches the first light-transmitting portion or the second light-transmitting portion. By making the third light-transmitting portion simultaneously opposite to the first light-transmitting portion and the second light-transmitting portion in one direction, even if the key mode light effect of the first light-transmitting portion or the second light-transmitting portion is blocked by the user's finger, the prompt light effect of the third light-transmitting portion can clearly let the user know whether the first light-transmitting portion or the second light-transmitting portion is successfully touched.

[0021] The above description is only used to illustrate the problem to be solved by the present disclosure, the technical means to solve the problem, and the effects produced, etc. The specific details of the present disclosure will be described in detail in the following implementation methods and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the above and other objects, features, advantages and embodiments of the present disclosure more clearly understood, the accompanying drawings are described as follows:

[0023] Figure 1 A schematic diagram illustrating an electronic device according to an embodiment of the present disclosure;

[0024] Figure 2 A partial top view of a backlight module according to an embodiment of the present disclosure is shown;

[0025] Figure 3 To illustrate Figure 2 A schematic cross-sectional view of a backlight module along line segment 3-3 in one embodiment;

[0026] Figure 4 To illustrate Figure 2 A schematic cross-sectional view of a backlight module along line segment 4-4 in one embodiment;

[0027] Figure 5 To illustrate Figure 3 A partial exploded view of a backlight module in one embodiment;

[0028] Figure 6 A partial exploded view of a backlight module according to another embodiment of the present disclosure is shown;

[0029] Figure 7 To illustrate the backlight module according to another embodiment of the present disclosure, Figure 2 A schematic cross-sectional view of line segment 3-3 in FIG.

[0030] Figure 8 To illustrate the backlight module according to another embodiment of the present disclosure, Figure 2 A schematic cross-sectional view of line segment 4-4 in FIG.

[0031] Fig. 9 To illustrate Figure 7 A partial exploded view of a backlight module in one embodiment;

[0032] Fig.10 A partial exploded view of a backlight module according to another embodiment of the present disclosure is shown;

[0033] Fig.11 FIG. 4 is a partial top view showing a finger touching a backlight module according to an embodiment of the present disclosure.

[0034]

Explanation of symbols

[0035] 100: Electronic devices

[0036] 110:Host

[0037] 111: Keyboard set

[0038] 112:Touchpad

[0039] 120: Display

[0040] 200,300,400,500:Backlight module

[0041] 210,410: Circuit board

[0042] 211,411: first light emitting element

[0043] 212,412: Second light emitting element

[0044] 213,413: Third light emitting element

[0045] 220,420: Grassroots

[0046] 231,331,431,531: ​​First light barrier

[0047] 232,332,432,532: Second light barrier

[0048] 241,441: First light guide

[0049] 241a, 441a: First microstructure group

[0050] 242,442: Second light guide

[0051] 242a, 442a: Second microstructure group

[0052] 243,443: The third light guide

[0053] 243a,443a: The third microstructure group

[0054] 251,451: First shading sheet

[0055] 252,452: Second shading sheet

[0056] 260: Cover

[0057] BZ1: The first light-shielding area

[0058] BZ2: The second light-shielding zone

[0059] BZ3: The third light-shielding zone

[0060] D1: First direction

[0061] D2: Second direction

[0062] LT1: First light-transmitting part

[0063] LT2: Second light-transmitting part

[0064] LT3: The third light-transmitting part

[0065] OP: Opening

[0066] OP1: First opening

[0067] OP2: Second opening

[0068] OP3: The third opening

[0069] OP4: The fourth opening

[0070] OP5: The fifth opening

[0071] WD1: First light transmission window

[0072] WD2: Second light transmission window

[0073] WD3: The third light transmission window

[0074] WD4: The fourth light transmission window

[0075] WD5: The fifth light window DETAILED DESCRIPTION

[0076] The following will disclose multiple embodiments of the present disclosure with the accompanying drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present disclosure. In other words, in some embodiments of the present disclosure, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and elements will be depicted in a simple schematic manner in the drawings.

[0077] Please refer to Figure 1 , which is a schematic diagram illustrating an electronic device 100 according to an embodiment of the present disclosure. Figure 1 As shown, in this embodiment, the electronic device 100 includes a host 110 and a display 120. The host 110 and the display 120 are connected (for example, via a pivot or hinge device) and can be flipped over each other. The host 110 includes a keyboard group 111, a touch pad 112 and a backlight module 200. The keyboard group 111 is located between the touch pad 112 and the backlight module 200. The touch pad 112 is located on the side of the keyboard group 111 away from the display 120. The backlight module 200 is located on the side of the keyboard group 111 close to the display 120. Although the electronic device 100 of this embodiment takes a notebook computer as an example, the present disclosure is not limited to this. In other words, the concept of the electronic device 100 disclosed in the present disclosure can be applied to any electronic product that includes a backlight module 200. The structure, function, and connection and actuation relationship between some components included in the electronic device 100 will be described in detail below.

[0078] Please refer to Figure 2 , which is a partial top view of a backlight module 200 according to an embodiment of the present disclosure. Figure 2 As shown, in this embodiment, the backlight module 200 includes a cover plate 260. The cover plate 260 has a plurality of light-transmitting portions. Any light-transmitting portion is a graphic, a symbol, a text or a combination thereof. Specifically, the cover plate 260 has a plurality of icon combinations consisting of a first light-transmitting portion LT1, a second light-transmitting portion LT2 and a third light-transmitting portion LT3. The first light-transmitting portion LT1 in each group of icon combinations is a function key graphic or text, the second light-transmitting portion LT2 in each group of icon combinations is a control and adjustment media key graphic, and the third light-transmitting portion LT3 in each group of icon combinations is a graphic located around (e.g., below) the first light-transmitting portion LT1 and the second light-transmitting portion LT2, but the present disclosure is not limited thereto. The backlight module 200 can further integrate a touch function and be configured to emit light in response to being touched. In other words, the backlight module 200 of this embodiment can replace the top row of function key physical keys and control and adjustment media key physical keys in the existing keyboard group.

[0079] like Figure 2 As shown, the first light-transmitting portion LT1 and the second light-transmitting portion LT2 in each icon combination are arranged along the first direction D1, and the third light-transmitting portion LT3 is opposite to the first light-transmitting portion LT1 and the second light-transmitting portion LT2 in the second direction D2 perpendicular to the first direction D1. Figure 2 In the illustrated embodiment, the third light-transmitting portion LT3 in each icon combination spans the first light-transmitting portion LT1 and the second light-transmitting portion LT2 on the same side of the first light-transmitting portion LT1 and the second light-transmitting portion LT2.

[0080] Please refer to Figure 3 , Figure 4 as well as Figure 5 . Figure 3 To illustrate Figure 2 FIG. 2 is a schematic cross-sectional view of the backlight module 200 along line segment 3 - 3 in one embodiment. Figure 4 To illustrate Figure 2 FIG. 4 is a schematic cross-sectional view of the backlight module 200 along line segment 4 - 4 in one embodiment. Figure 5 To illustrate Figure 3 A partial exploded view of the backlight module 200 in one embodiment. Figures 3 to 5 As shown, the backlight module 200 further includes a base layer 220, a first light spacer 231, a first light guide plate 241, a second light guide plate 242, a first light shielding plate 251, a second light spacer 232, a third light guide plate 243 and a second light shielding plate 252. The base layer 220 has a first opening OP1, a second opening OP2 and a third opening OP3. The first light spacer 231 is disposed above the base layer 220, and has a first light isolation zone BZ1, a second light isolation zone BZ2 and a fourth opening OP4. The first light guide plate 241 is disposed in the first light isolation zone BZ1. The second light guide plate 242 is disposed in the second light isolation zone BZ2. The first light shielding plate 251 is disposed above the first light spacer 231, and has a first light-transmitting window WD1, a second light-transmitting window WD2 and a fifth opening OP5. The third opening OP3, the fourth opening OP4 and the fifth opening OP5 are disposed correspondingly. As shown Figure 3 As shown, the third opening OP3, the fourth opening OP4 and the fifth opening OP5 are aligned in the stacking direction of the base layer 220, the first light-isolating sheet 231 and the first light-shielding sheet 251. The second light-isolating sheet 232 is disposed above the first light-shielding sheet 251 and has a third light-shielding zone BZ3. The third light-guiding sheet 243 is disposed in the third light-shielding zone BZ3. The second light-shielding sheet 252 is disposed above the second light-isolating sheet 232 and has a third light-transmitting window WD3, a fourth light-transmitting window WD4 and a fifth light-transmitting window WD5. Figure 3 and Figure 4 As shown, the first light-transmitting window WD1 and the third light-transmitting window WD3 are arranged correspondingly (ie aligned in the aforementioned stacking direction) to form a first light-emitting path. Figure 4As shown, the second light-transmitting window WD2 and the fourth light-transmitting window WD4 are arranged correspondingly (ie aligned in the aforementioned stacking direction) to form a second light-emitting path. Figure 3 As shown, the fifth light-transmitting window WD5 forms a third light-emitting path.

[0081] Further, if Figure 3 and Figure 4 As shown, in this embodiment, the first light guide plate 241 has a first microstructure group 241a. The first microstructure group 241a is disposed on the side of the first light guide plate 241 facing the base layer 220. The first microstructure group 241a is disposed correspondingly to the first light-transmitting window WD1 of the first light-shielding plate 251 and the third light-transmitting window WD3 of the second light-shielding plate 252 (i.e., aligned in the aforementioned stacking direction) to form a first light-emitting path. The second light guide plate 242 has a second microstructure group 242a. The second microstructure group 242a is disposed on the side of the second light guide plate 242 facing the base layer 220. The second microstructure group 242a is disposed correspondingly to the second light-transmitting window WD2 of the first light-shielding plate 251 and the fourth light-transmitting window WD4 of the second light-shielding plate 252 (i.e., aligned in the aforementioned stacking direction) to form a second light-emitting path. The third light guide plate 243 has a third microstructure group 243a. The third microstructure group 243a is disposed on the side of the third light guide plate 243 facing the first light-shielding plate 251. The third microstructure group 243a is disposed correspondingly to the fifth light-transmitting window WD5 of the second light-shielding film 252 (ie, aligned in the aforementioned stacking direction) to form a third light-emitting path.

[0082] At Figure 3 and Figure 4 In the illustrated embodiment, the first microstructure group 241 a , the second microstructure group 242 a , and the third microstructure group 243 a are surface-concave microstructures, but the present disclosure is not limited thereto.

[0083] like Figures 3 to 5As shown, the backlight module 200 further includes a circuit board 210. The circuit board 210 is disposed below the substrate 220 and has a first light emitting element 211, a second light emitting element 212, and a third light emitting element 213. The first light emitting element 211 passes through the first opening OP1 of the substrate 220 and is opposite to the side surface of the first light guide plate 241. The second light emitting element 212 passes through the second opening OP2 of the substrate 220 and is opposite to the side surface of the second light guide plate 242. The third light emitting element 213 passes through the third opening OP3 of the substrate 220, the fourth opening OP4 of the first light partition sheet 231, and the fifth opening OP5 of the first light shielding sheet 251 in sequence and is opposite to the side surface of the third light guide plate 243. It can be seen that the first light guide plate 241 and the second light guide plate 242 are separated from the third light emitting element 213 by the first light partition sheet 231, so that the light emitted by the third light emitting element 213 will be blocked by the first light partition sheet 231 and will not enter the first light guide plate 241 and the second light guide plate 242. The light emitted by the first light emitting element 211 reaches the first light-transmitting portion LT1 via the first light-emitting path. The light emitted by the second light emitting element 212 reaches the second light-transmitting portion LT2 via the second light-emitting path. The light emitted by the third light emitting element 213 reaches the third light-transmitting portion LT3 via the third light-emitting path.

[0084] As can be seen from the above structural configuration, the backlight module 200 of this embodiment mainly adopts a double-layer light guide structure, in which one layer of the light guide structure includes a first light guide plate 241 and a second light guide plate 242, and the other layer of the light guide structure includes a third light guide plate 243. The first light exit path and the second light exit path pass through different layers of light guide structures at the same time (the first light exit path passes through the first light guide plate 241 and the third light guide plate 243, and the second light exit path passes through the second light guide plate 242 and the third light guide plate 243). In this way, the backlight module 200 of this embodiment only needs a double-layer light guide structure to independently present three display light effects within a limited footprint. For example, the first light exit path and the second light exit path emit light from the first light-transmitting portion LT1 and the second light-transmitting portion LT2, respectively, to respectively generate two key mode (for example, function mode and entertainment mode) light effects, and the third light exit path emits light from the third light-transmitting portion LT3 of the cover plate 260 to generate a prompt light effect.

[0085] In some embodiments, the material of the cover plate 260 includes glass or plastic, but the disclosure is not limited thereto. In some embodiments, the plastic includes polyester resin (Mylar), but the disclosure is not limited thereto.

[0086] In some embodiments, the cover plate 260 includes a base layer, a semi-transparent layer, and an opaque layer (not shown). In some embodiments, the semi-transparent layer can be formed by applying a semi-transparent ink to the bottom surface of the base layer through a coating process. In some embodiments, the opaque layer can be formed by applying a light-shielding ink to the side of the semi-transparent layer away from the base layer through a coating process. The opaque layer has a hollow area. Through the aforementioned structural configuration, the light reaching the cover plate 260 from below will leave the cover plate 260 after passing through the hollow area in the opaque layer, the semi-transparent layer, and the base layer in sequence. The area where the user can see the light emitted by the first light-emitting element 211 above the cover plate 260 is the aforementioned first light-transmitting portion LT1. The area where the user can see the light emitted by the second light-emitting element 212 above the cover plate 260 is the aforementioned second light-transmitting portion LT2. The area where the user can see the light emitted by the third light-emitting element 213 above the cover plate 260 is the aforementioned third light-transmitting portion LT3.

[0087] In some embodiments, the base layer 220 is a soda lime glass layer, but the present disclosure is not limited thereto.

[0088] In some embodiments, the material of at least one of the first light-isolating sheet 231 and the second light-isolating sheet 232 includes plastic, but the disclosure is not limited thereto. In some embodiments, the plastic includes polycarbonate (PC), but the disclosure is not limited thereto.

[0089] In some embodiments, the material of the first light shielding sheet 251 includes plastic, but the disclosure is not limited thereto. In some embodiments, the aforementioned plastic includes polyethylene terephthalate (PET), but the disclosure is not limited thereto. In some embodiments, the first light shielding sheet 251 is printed with black material to achieve the light shielding effect, and the unprinted portion forms the aforementioned first light-transmitting window WD1 and the second light-transmitting window WD2.

[0090] In some embodiments, the second light shielding sheet 252 is a black film with a central area that is light-transmissive (ie, the third light-transmissive window WD3, the fourth light-transmissive window WD4, and the fifth light-transmissive window WD5), but the present disclosure is not limited thereto. Figure 3 As shown, the second light shielding film 252 can at least cover the third light guide plate 243, the first light shielding film 251, the first light guide plate 241, the second light guide plate 242, the base layer 220 to one side of the circuit board 210 to prevent light leakage from the side and prevent moisture from escaping into the backlight module 200.

[0091] In some embodiments, at least one of the first light emitting element 211 , the second light emitting element 212 , and the third light emitting element 213 is a light emitting diode, but the present disclosure is not limited thereto.

[0092] In some embodiments, the backlight module 200 integrates a touch function, and can be designed so that the third light-transmitting portion LT3 emits light synchronously when the user's finger touches the first light-transmitting portion LT1 or the second light-transmitting portion LT2. In some embodiments, as described above, the first light-transmitting portion LT1 and the second light-transmitting portion LT2 are arranged along the first direction D1, and the third light-transmitting portion LT3 is opposite to the first light-transmitting portion LT1 and the second light-transmitting portion LT2 at the same time in the second direction D2 perpendicular to the first direction D1. In other words, the third light-transmitting portion LT3 spans the first light-transmitting portion LT1 and the second light-transmitting portion LT2 on the same side of the first light-transmitting portion LT1 and the second light-transmitting portion LT2. In this way, even if the key mode light effect of the first light-transmitting portion LT1 or the second light-transmitting portion LT2 is blocked by the user's finger, the prompt light effect of the third light-transmitting portion LT3 can clearly let the user know whether the first light-transmitting portion LT1 or the second light-transmitting portion LT2 is successfully touched.

[0093] like Figure 5 As shown, in this embodiment, the first light isolation area BZ1 and the second light isolation area BZ2 of the first light isolation sheet 231 and the third light isolation area BZ3 of the second light isolation sheet 232 are gaps formed by side depressions, but the disclosure is not limited thereto.

[0094] Please refer to Figure 6 , which is a partial exploded view of a backlight module 300 according to another embodiment of the present disclosure. Figure 6 As shown, in this embodiment, the backlight module 300 includes a circuit board 210, a base layer 220, a first light barrier 331, a first light guide 241, a second light guide 242, a first light shielding sheet 251, a second light barrier 332, a third light guide 243, a second light shielding sheet 252 and a cover plate 260, wherein the circuit board 210, the base layer 220, the first light guide 241, the second light guide 242, the first light shielding sheet 251, the third light guide 243, the second light shielding sheet 252 and the cover plate 260 are the same as Figure 5 Therefore, please refer to the above related descriptions, and will not repeat them here. Figure 5 The difference between the illustrated embodiment is that the first light isolation zone BZ1 and the second light isolation zone BZ2 of the first light isolation sheet 331 and the third light isolation zone BZ3 of the second light isolation sheet 332 in this embodiment are closed through holes.

[0095] In practical applications, at least one of the first light isolation zone BZ1 and the second light isolation zone BZ2 of the first light isolation sheet 231 and the third light isolation zone BZ3 of the second light isolation sheet 232 is a through hole or a notch, that is, it can be any combination of a through hole and a notch.

[0096] Please refer to Figure 7 , Figure 8 as well as Fig. 9 . Figure 7To illustrate a backlight module 400 according to another embodiment of the present disclosure, Figure 2 Schematic cross-sectional view of line segment 3-3 in FIG. Figure 8 To illustrate a backlight module 400 according to another embodiment of the present disclosure, Figure 2 Schematic cross-sectional view of line segment 4-4 in FIG. Fig. 9 To illustrate Figure 7 A partial exploded view of the backlight module 400 in one embodiment. Figures 7 to 9 As shown, the backlight module 400 includes a circuit board 410, a base layer 420, a first light isolation sheet 431, a first light guide sheet 441, a first light shielding sheet 451, a second light isolation sheet 432, a second light guide sheet 442, a third light guide sheet 443, a second light shielding sheet 452 and a cover plate 260, wherein the cover plate 260 is the same as Figure 5 The embodiment shown in the figure can therefore refer to the above-mentioned related description, which will not be repeated here. The base layer 420 has an opening OP. The circuit board 410 is arranged below the base layer 420 and has a first light-emitting element 411, a second light-emitting element 412 and a third light-emitting element 413. The first light-emitting element 411 passes through the opening OP of the base layer 420 and is opposite to the side surface of the first light guide plate 441. The first light-isolating plate 431 is arranged above the base layer 420 and has a first light-isolating area BZ1. The first light-guiding plate 441 is arranged in the first light-isolating area BZ1. The first light-shielding plate 451 is arranged above the first light-shielding plate 431 and has a first light-transmitting window WD1. The second light-shielding plate 432 is arranged above the first light-shielding plate 451 and has a second light-isolating area BZ2 and a third light-isolating area BZ3. The second light-guiding plate 442 is arranged in the second light-isolating area BZ2. The third light-guiding plate 443 is arranged in the third light-isolating area BZ3. The second light shielding sheet 452 is disposed above the second light isolation sheet 432 and has a second light transmission window WD2, a third light transmission window WD3 and a fourth light transmission window WD4. Figure 7 As shown, the first light-transmitting window WD1 and the second light-transmitting window WD2 are arranged correspondingly (ie aligned in the aforementioned stacking direction) to form a first light-emitting path. Figure 8 As shown, the third light-transmitting window WD3 forms a second light-emitting path. Figure 8As shown, the fourth light-transmitting window WD4 forms a third light-emitting path. The second light-emitting element 412 is laterally located on the same side of the base layer 420, the first light-isolating sheet 431, the first light-shielding sheet 451 and the second light-isolating sheet 432 and opposite to the side surface of the second light-guiding sheet 442. The third light-emitting element 413 is laterally located on the same side of the base layer 420, the first light-isolating sheet 431, the first light-shielding sheet 451 and the second light-isolating sheet 432 and opposite to the side surface of the third light-guiding sheet 443. It can be seen that the first light-guiding sheet 441 is separated from the second light-emitting element 412 and the third light-emitting element 413 by the first light-isolating sheet 431, so that the light emitted by the second light-emitting element 412 and the third light-emitting element 413 will be blocked by the first light-isolating sheet 431 and will not enter the first light-guiding sheet 441. The light emitted by the first light-emitting element 411 reaches the third light-transmitting portion LT3 via the first light-emitting path. The light emitted by the second light-emitting element 412 reaches the first light-transmitting portion LT1 via the second light-emitting path. The light emitted by the third light emitting element 413 reaches the second light-transmitting portion LT2 via the third light-emitting path.

[0097] Further, if Figure 7 and Figure 8 As shown, in this embodiment, the first light guide plate 441 has a first microstructure group 441a. The first microstructure group 441a is disposed on the side of the first light guide plate 441 facing the base layer 420. The first microstructure group 441a is disposed correspondingly to the first light-transmitting window WD1 of the first light-shielding plate 451 and the second light-transmitting window WD2 of the second light-shielding plate 452 (i.e., aligned in the aforementioned stacking direction) to form a first light-emitting path. The second light guide plate 442 has a second microstructure group 442a. The second microstructure group 442a is disposed on the side of the second light guide plate 442 facing the first light-shielding plate 451. The second microstructure group 442a is disposed correspondingly to the third light-transmitting window WD3 of the second light-shielding plate 452 (i.e., aligned in the aforementioned stacking direction) to form a second light-emitting path. The third light guide plate 443 has a third microstructure group 443a. The third microstructure group 443a is disposed on the side of the third light guide plate 443 facing the first light-shielding plate 451. The third microstructure group 443a is disposed correspondingly to the fourth light-transmitting window WD4 of the second light-shielding sheet 452 (ie, aligned in the aforementioned stacking direction) to form a third light-emitting path.

[0098] At Figure 7 and Figure 8 In the illustrated embodiment, the first microstructure group 441 a , the second microstructure group 442 a , and the third microstructure group 443 a are surface-concave microstructures, but the present disclosure is not limited thereto.

[0099] As can be seen from the aforementioned structural configuration, the backlight module 400 of the present embodiment mainly adopts a double-layer light guide structure, in which one layer of the light guide structure includes a first light guide plate 441, and the other layer of the light guide structure includes a second light guide plate 442 and a third light guide plate 443. The first light output path passes through different layers of light guide structures at the same time (that is, it passes through the first light guide plate 441, the second light guide plate 442 and the third light guide plate 443 at the same time). In this way, the backlight module 400 of the present embodiment only needs a double-layer light guide structure to independently present three display light effects within a limited footprint. For example, the second light output path and the third light output path are emitted by the first light-transmitting portion LT1 and the second light-transmitting portion LT2, respectively, to respectively produce two key mode (for example, functional mode and entertainment mode) light effects, and the first light output path is emitted by the third light-transmitting portion LT3 of the cover plate 260 to produce a prompt light effect.

[0100] In some embodiments, as described above, the cover plate 260 includes a base layer, a semi-transparent layer, and an opaque layer (not shown). The area above the cover plate 260 where the user can see the light emitted by the second light-emitting element 412 is the aforementioned first light-transmitting portion LT1. The area above the cover plate 260 where the user can see the light emitted by the third light-emitting element 413 is the aforementioned second light-transmitting portion LT2. The area above the cover plate 260 where the user can see the light emitted by the first light-emitting element 411 is the aforementioned third light-transmitting portion LT3.

[0101] In some embodiments, the base layer 420 is a soda-lime glass layer, but the present disclosure is not limited thereto.

[0102] In some embodiments, the material of at least one of the first light-isolating sheet 431 and the second light-isolating sheet 432 includes plastic, but the disclosure is not limited thereto. In some embodiments, the plastic includes polycarbonate, but the disclosure is not limited thereto.

[0103] In some embodiments, the material of the first light shielding sheet 451 includes plastic, but the disclosure is not limited thereto. In some embodiments, the aforementioned plastic includes polyethylene terephthalate, but the disclosure is not limited thereto. In some embodiments, the first light shielding sheet 451 is printed with black material to achieve the light shielding effect, and the unprinted portion forms the aforementioned first light-transmitting window WD1.

[0104] In some embodiments, the second light shielding sheet 452 is a black film with a central area that is light-transmissive (ie, the second light-transmissive window WD2, the third light-transmissive window WD3, and the fourth light-transmissive window WD4), but the present disclosure is not limited thereto. Figure 7As shown, the second light shielding film 452 can at least cover the third light guide plate 443, the first light shielding film 451, the first light guide plate 441, the second light guide plate 442, the base layer 420 to one side of the circuit board 410 to prevent light leakage from the side and prevent moisture from escaping into the backlight module 400.

[0105] In some embodiments, at least one of the first light emitting element 411 , the second light emitting element 412 , and the third light emitting element 413 is a light emitting diode, but the present disclosure is not limited thereto.

[0106] like Fig. 9 As shown, in this embodiment, the first light isolation zone BZ1 of the first light isolation sheet 431 and the second light isolation zone BZ2 and the third light isolation zone BZ3 of the second light isolation sheet 432 are gaps formed by side depressions, but the present disclosure is not limited thereto.

[0107] Please refer to Fig.10 , which is a partial exploded view of a backlight module 500 according to another embodiment of the present disclosure. Fig.10 As shown, in this embodiment, the backlight module 500 includes a circuit board 410, a base layer 420, a first light barrier 531, a first light guide 441, a first light shielding sheet 451, a second light barrier 532, a second light guide 442, a third light guide 443, a second light shielding sheet 452 and a cover plate 260, wherein the circuit board 410, the base layer 420, the first light guide 441, the first light shielding sheet 451, the second light guide 442, the third light guide 443, the second light shielding sheet 452 and the cover plate 260 are the same as Fig. 9 Therefore, please refer to the above related descriptions, and will not repeat them here. Fig. 9 The difference between the illustrated embodiment is that the first light isolation zone BZ1 of the first light isolation sheet 531 and the second light isolation zone BZ2 and the third light isolation zone BZ3 of the second light isolation sheet 532 in this embodiment are closed through holes.

[0108] In practical applications, at least one of the first light isolation zone BZ1 of the first light isolation sheet 431 and the second light isolation zone BZ2 and the third light isolation zone BZ3 of the second light isolation sheet 432 is a through hole or a notch, that is, it can be any combination of a through hole and a notch.

[0109] Please refer to Fig.11 , which is a partial top view showing a finger touching the backlight module 200 according to an embodiment of the present disclosure. Fig.11As shown, in the implementation of the backlight module 200 integrating the touch function, when the backlight module 200 is in the display light effect of the function mode, the first light-transmitting portion LT1 (i.e., the function key graphic or text) in each group of icon combinations transmits light, while the second light-transmitting portion LT2 (i.e., the control and adjustment media key graphic) does not transmit light. When the backlight module 200 is in the display light effect of the entertainment mode, the first light-transmitting portion LT1 (i.e., the function key graphic or text) in each group of icon combinations does not transmit light, while the second light-transmitting portion LT2 (i.e., the control and adjustment media key graphic) transmits light. When the user's finger touches the first light-transmitting portion LT1 or the second light-transmitting portion LT2 in one group of icon combinations, the third light-transmitting portion LT3 in the same group of icon combinations emits light synchronously. Thereby, even if the key mode light effect of the first light-transmitting portion LT1 or the second light-transmitting portion LT2 is blocked by the user's finger, the prompt light effect of the third light-transmitting portion LT3 can clearly let the user know whether the first light-transmitting portion LT1 or the second light-transmitting portion LT2 is successfully touched.

[0110] From the above detailed description of the specific implementation methods of the present disclosure, it can be clearly seen that the backlight module of the present disclosure mainly adopts a double-layer light-guiding structure, in which at least one of the three light-emitting paths passes through two light-guiding layers at the same time. Thereby, the backlight module of the present disclosure only needs a double-layer light-guiding structure to independently present three display light effects in a limited footprint. Further, the aforementioned two light-emitting paths emit light from the first light-transmitting portion and the second light-transmitting portion of the cover plate, respectively, to respectively produce two key mode (for example, functional mode and entertainment mode) light effects, and the aforementioned third light-emitting path emits light from the third light-transmitting portion of the cover plate, to produce a prompt light effect. In the implementation method of integrating the touch function into the backlight module, the third light-transmitting portion can be designed to emit light synchronously when the user's finger touches the first light-transmitting portion or the second light-transmitting portion. By making the third light-transmitting portion opposite to the first light-transmitting portion and the second light-transmitting portion in one direction at the same time, even if the key mode light effect of the first light-transmitting portion or the second light-transmitting portion is blocked by the user's finger, the prompt light effect of the third light-transmitting portion can clearly let the user know whether the first light-transmitting portion or the second light-transmitting portion is successfully touched.

[0111] Although the present disclosure has been disclosed in the above embodiments, it is not intended to limit the present disclosure. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be determined by the definition of the attached claims.

Claims

1. A backlight module, characterized in that: Include: A base layer having a first opening, a second opening and a third opening; A first light-isolating sheet is disposed above the base layer and has a first light-isolating area, a second light-isolating area and a fourth opening; A first light guide plate, disposed in the first light isolation area; A second light guide plate, disposed in the second light isolation area; A first light shielding sheet is disposed above the first light isolating sheet and has a first light-transmitting window, a second light-transmitting window and a fifth opening, wherein the third opening, the fourth opening and the fifth opening are disposed correspondingly; a second light-isolating sheet, disposed above the first light-shielding sheet and having a third light-isolating area; a third light guide plate, disposed in the third light isolation area; as well as A second light shielding sheet is disposed above the second light isolating sheet and has a third light-transmitting window, a fourth light-transmitting window and a fifth light-transmitting window; The first light-transmitting window and the third light-transmitting window are correspondingly arranged to form a first light-emitting path, the second light-transmitting window and the fourth light-transmitting window are correspondingly arranged to form a second light-emitting path, and the fifth light-transmitting window forms a third light-emitting path.

2. The backlight module according to claim 1, wherein: The first light guide plate has a first microstructure group, and the first microstructure group is arranged corresponding to the first light-transmitting window and the third light-transmitting window to form the first light-emitting path. The second light guide plate has a second microstructure group, and the second microstructure group is arranged corresponding to the second light-transmitting window and the fourth light-transmitting window to form the second light-emitting path. The third light guide plate has a third microstructure group, and the third microstructure group is arranged corresponding to the fifth light-transmitting window to form the third light-emitting path.

3. The backlight module according to claim 1, wherein: At least one of the first light-isolating area, the second light-isolating area and the third light-isolating area is a through hole or a notch.

4. The backlight module according to claim 1, wherein: It further includes a circuit board, which is arranged under the base layer and has a first light-emitting element, a second light-emitting element and a third light-emitting element. The first light-emitting element passes through the first opening and is opposite to a side surface of the first light guide, the second light-emitting element passes through the second opening and is opposite to a side surface of the second light guide, and the third light-emitting element passes through the third opening, the fourth opening and the fifth opening in sequence and is opposite to a side surface of the third light guide.

5. The backlight module according to claim 4, wherein: The invention further comprises a cover plate having a first light-transmitting portion, a second light-transmitting portion and a third light-transmitting portion, wherein the light emitted by the first light-emitting element reaches the first light-transmitting portion via the first light-emitting path, the light emitted by the second light-emitting element reaches the second light-transmitting portion via the second light-emitting path, and the light emitted by the third light-emitting element reaches the third light-transmitting portion via the third light-emitting path.

6. The backlight module according to claim 5, characterized in that: Any one of the first light-transmitting portion, the second light-transmitting portion and the third light-transmitting portion is a graphic, a symbol, a text or a combination thereof.

7. The backlight module according to claim 5, wherein: The first light-transmitting portion and the second light-transmitting portion are arranged along a first direction, and the third light-transmitting portion is opposite to the first light-transmitting portion and the second light-transmitting portion in a second direction perpendicular to the first direction.

8. A backlight module, characterized in that: Include: a base layer having an opening; A first light-isolating sheet is disposed above the base layer and has a first light-isolating area; A first light guide plate, disposed in the first light isolation area; A first light shielding sheet, disposed above the first light isolating sheet and having a first light-transmitting window; A second light-isolating sheet, disposed above the first light-shielding sheet, and having a second light-isolating area and a third light-isolating area; A second light guide plate, disposed in the second light isolation area; a third light guide plate, disposed in the third light isolation area; and A second light shielding sheet is disposed above the second light isolating sheet and has a second light-transmitting window, a third light-transmitting window and a fourth light-transmitting window; The first light-transmitting window and the second light-transmitting window are arranged correspondingly to form a first light-emitting path, the third light-transmitting window forms a second light-emitting path, and the fourth light-transmitting window forms a third light-emitting path.

9. The backlight module according to claim 8, wherein: The first light guide plate has a first microstructure group, and the first microstructure group is arranged corresponding to the first light-transmitting window and the second light-transmitting window to form the first light-emitting path. The second light guide plate has a second microstructure group, and the second microstructure group is arranged corresponding to the third light-transmitting window to form the second light-emitting path. The third light guide plate has a third microstructure group, and the third microstructure group is arranged corresponding to the fourth light-transmitting window to form the third light-emitting path.

10. The backlight module according to claim 8, wherein: At least one of the second light-isolating area and the third light-isolating area is a through hole or a notch.

11. The backlight module according to claim 8, wherein: It further includes a circuit board, which is arranged below the base layer and has a first light-emitting element, a second light-emitting element and a third light-emitting element. The first light-emitting element passes through the opening and is opposite to a side surface of the first light guide, the second light-emitting element is laterally located on the same side of the base layer, the first light spacer, the first light shielding film and the second light spacer and is opposite to a side surface of the second light guide, and the third light-emitting element is laterally located on the same side of the base layer, the first light spacer, the first light shielding film and the second light spacer and is opposite to a side surface of the third light guide.

12. The backlight module according to claim 11, wherein: The invention further comprises a cover plate having a first light-transmitting portion, a second light-transmitting portion and a third light-transmitting portion, wherein the light emitted by the first light-emitting element reaches the third light-transmitting portion via the first light-emitting path, the light emitted by the second light-emitting element reaches the first light-transmitting portion via the second light-emitting path, and the light emitted by the third light-emitting element reaches the second light-transmitting portion via the third light-emitting path.

13. The backlight module according to claim 12, wherein: Any one of the first light-transmitting portion, the second light-transmitting portion and the third light-transmitting portion is a graphic, a symbol, a text or a combination thereof.

14. The backlight module according to claim 12, wherein: The first light-transmitting portion and the second light-transmitting portion are arranged along a first direction, and the third light-transmitting portion is opposite to the first light-transmitting portion and the second light-transmitting portion in a second direction perpendicular to the first direction.

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