Backlight module

Abstract

A backlight module comprises a circuit board, a light guide layer, a light emitting module, a light shielding layer, a cover plate, a first light filtering layer and a second light filtering layer. The light guide layer is disposed over the circuit board and includes a microstructure group. The light-emitting module is arranged on the circuit board and is configured to emit first wave band light and second wave band light. The light shielding layer is arranged above the light emitting module and is provided with a first hollow part. The first filter layer is arranged between the shading layer and the cover plate and is provided with a second hollow part. The second filter layer is arranged between the shading layer and the cover plate and is provided with a third hollow part. The first wave band light is guided by the microstructure group, upwardly passes through the first hollow part, the third hollow part and the first filter layer and then is emitted by the cover plate, or the second wave band light is guided by the microstructure group, upwardly passes through the first hollow part, the second filter layer and the second hollow part and then is emitted by the cover plate. According to the backlight module disclosed by the invention, the volume occupied by the whole backlight module can be effectively reduced.

Description

Technical Field

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

[0002] Generally speaking, to present two panel display modes (dual mode) in a backlight module (e.g., a backlit touchpad), two light-emitting units, two light guide plates, and light-shielding blocks are typically provided in the backlight module. By providing a double-layer light guide plate and providing appropriate light shielding by the block, it is possible to achieve the effect of having one light-emitting unit illuminate only one light guide plate and the other light-emitting unit illuminate only the other light guide plate, thereby achieving dual mode in a single backlight module. However, such a double-layer light guide plate structure does not save space in the entire backlight module.

[0003] Therefore, how to propose a backlight module that can solve the above problems is one of the issues that the industry is eager to invest research and development resources to solve. Summary of the Invention

[0004] In view of this, an object of the present disclosure is to provide a backlight module that can solve the above problems.

[0005] In order to achieve the above-mentioned objectives, according to one embodiment of the present disclosure, a backlight module includes a circuit board, a light guide layer, a light emitting module, a light shielding layer, a cover plate, a first filter layer, and a second filter layer. The light guide layer is arranged above the circuit board and includes a microstructure group. The light emitting module is arranged on the circuit board and is configured to emit light of a first wavelength band and light of a second wavelength band. The light shielding layer is arranged above the light emitting module and has a first hollow portion corresponding to the microstructure group. The cover plate is arranged above the light shielding layer. The first filter layer is arranged between the light shielding layer and the cover plate and has a second hollow portion corresponding to the microstructure group. The second filter layer is arranged between the light shielding layer and the cover plate and has a third hollow portion corresponding to the microstructure group. The light of the first wavelength band is guided by the microstructure group and then passes upward through the first hollow portion, the third hollow portion, and the first filter layer and then exits from the cover plate, or the light of the second wavelength band is guided by the microstructure group and then passes upward through the first hollow portion, the second filter layer, and the second hollow portion and then exits from the cover plate.

[0006] In one or more embodiments of the present disclosure, the first filter layer is configured to block the light in the second wavelength band from passing through, and the second filter layer is configured to block the light in the first wavelength band from passing through.

[0007] In one or more embodiments of the present disclosure, the second hollow portion presents a first graphic, and the third hollow portion presents a second graphic. The first hollow portion presents one of the following: the first graphic; the second graphic; and a third graphic consisting of at least a union of the first and second graphics.

[0008] In one or more embodiments of the present disclosure, the light guide layer has a through hole configuration to accommodate the light emitting module.

[0009] In one or more embodiments of the present disclosure, the backlight module further includes a reflective layer disposed between the circuit board and the light guide layer.

[0010] In one or more embodiments of the present disclosure, the microstructure group is located on a side of the light guide layer close to the light reflective layer.

[0011] In one or more embodiments of the present disclosure, the light emitting module includes a first light emitting element and a second light emitting element. The first light emitting element emits light of a first wavelength band, and the second light emitting element emits light of a second wavelength band.

[0012] In one or more embodiments of the present disclosure, the first filter layer and the second filter layer are filter films or filter coatings coated on the cover plate.

[0013] In one or more embodiments of the present disclosure, the wavelength of the light in the first wavelength band is completely different from the wavelength of the light in the second wavelength band.

[0014] In one or more embodiments of the present disclosure, the wavelength of the first wavelength band light is within the range of 580 nm to 780 nm, and the wavelength of the second wavelength band light is within the range of 435 nm to 579 nm.

[0015] In summary, in the backlight module disclosed herein, because the first hollow portion of the light-shielding layer, the second hollow portion of the first filter layer, and the third hollow portion of the second filter layer are all arranged corresponding to the microstructure group, both the first wavelength band and the second wavelength band can be guided by the microstructure group to emit upward, thereby presenting a pattern. In the backlight module disclosed herein, because the patterned first filter layer allows the first wavelength band to pass through while blocking the second wavelength band, and the patterned second filter layer allows the second wavelength band to pass through while blocking the first wavelength band, the light-emitting module can present different patterns when emitting light of different wavelength bands, without the need for an additional light-guiding layer. In short, the backlight module disclosed herein can effectively reduce the overall volume occupied by the backlight module.

[0016] The above description is merely 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 embodiments and related drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To make the above and other objects, features, advantages and embodiments of the present disclosure more apparent and understandable, the accompanying drawings are described as follows:

[0018] Figure 1 A schematic diagram illustrating a backlight module according to one embodiment of the present disclosure is shown;

[0019] Figure 2A schematic diagram illustrating a backlight module according to one embodiment of the present disclosure is shown;

[0020] Figure 3 A schematic diagram illustrating a first graphic, a second graphic, and a third graphic according to an embodiment of the present disclosure;

[0021] Figure 4 A schematic diagram illustrating a third graph according to an embodiment of the present disclosure;

[0022] Figure 5 A schematic diagram illustrating light of a first wavelength band and light of a second wavelength band sequentially passing through a light shielding layer, a second filter layer, and a first filter layer according to one embodiment of the present disclosure is shown.

[0023]

Explanation of symbols

[0024] 100: Backlight module

[0025] 110: Circuit board

[0026] 120: Reflective layer

[0027] 130: Light guide layer

[0028] 140: Light isolation part

[0029] 150:Light-shielding layer

[0030] 160: first filter layer

[0031] 170: Second filter layer

[0032] 180: Cover

[0033] 182: Translucent cover

[0034] 184: Transparent cover

[0035] HP1: First hollow part

[0036] HP2: Second hollow part

[0037] HP3: The third hollow part

[0038] ISA: Intersection Area

[0039] L1: first wavelength light

[0040] L2: second wavelength light

[0041] LE1: first light-emitting element

[0042] LE2: Second light-emitting element

[0043] LM: Light emitting module

[0044] MG: Microstructure Group

[0045] PN1: First Graphic

[0046] PN2: Second Graphic

[0047] PN3: Third Figure

[0048] TH:Through hole DETAILED DESCRIPTION

[0049] The following drawings illustrate various embodiments of the present disclosure. For clarity, many practical details will be included in the following description. However, it should be understood that these practical details are not intended to limit the present disclosure. In other words, these practical details are not essential to some embodiments of the present disclosure. Furthermore, to simplify the drawings, some commonly used structures and components are depicted in simplified schematic form. The same reference numerals will be used throughout the drawings to indicate identical or similar components.

[0050] The structure and function of each component included in the backlight module 100 of this embodiment and the connection relationship between the components will be described in detail below.

[0051] Please refer to Figure 1 . Figure 1 FIG is a schematic diagram of a backlight module 100 according to an embodiment of the present disclosure. Figure 1 As shown, in this embodiment, a backlight module 100 is provided. The backlight module 100 includes a circuit board 110, a reflective layer 120, a light guide layer 130, a light emitting module LM, a light isolation portion 140, a light shielding layer 150, a first filter layer 160, a second filter layer 170, and a cover plate 180. The reflective layer 120 is disposed on the circuit board 110. The light guide layer 130 is disposed above the circuit board 110. In some embodiments, the reflective layer 120 is disposed between the circuit board 110 and the light guide layer 130. The light guide layer 130 includes a microstructure group MG. Specifically, the microstructure group MG includes a plurality of microstructures configured to guide light. In some embodiments, the microstructure group MG is located on a side of the light guide layer 130 adjacent to the reflective layer 120. The light emitting module LM is disposed on the circuit board 110 and configured to emit light. Specifically, the light guide layer 130 has a through hole TH configured to accommodate the light emitting module LM. In some embodiments, the light reflecting layer 120 also has through holes TH, so that the light emitting module LM is located in the through holes TH and can be disposed on the circuit board 110. In some embodiments, the through holes TH of the light reflecting layer 120 and the through holes TH of the light guiding layer 130 correspond to each other in a direction (e.g., a top view direction).

[0052] In this embodiment, the light-isolating portion 140 is disposed above the circuit board 110 and is located on one side of the light-guiding layer 130 and one side of the light-emitting module LM. The light-isolating portion 140 and the light-guiding layer 130 define a space for the through hole TH. The light-isolating portion 140 is configured to block light emitted by the light-emitting module LM to prevent light leakage. The light-shielding layer 150 is disposed above the light-emitting module LM. The cover plate 180 is disposed above the light-shielding layer 150. The first filter layer 160 and the second filter layer 170 are disposed between the light-shielding layer 150 and the cover plate 180. The first filter layer 160 is located between the second filter layer 170 and the cover plate 180. In some embodiments, when assembling the backlight module 100, the manufacturer may first place the light-shielding layer 150, the first filter layer 160, and the second filter layer 170 on the cover plate 180, and then place the processed cover plate 180 over the light-guiding layer 130 and the light-emitting module LM.

[0053] In some embodiments, the light emitting module LM may include, for example, a light emitting diode (LED) or other suitable light source. In some embodiments, the light emitting module LM may be, for example, a single RGB LED. However, the present disclosure is not intended to limit the type of light emitting module LM.

[0054] In some embodiments, the light-isolating portion 140 is substantially opaque. In some embodiments, the light-isolating portion 140 can be, for example, black polycarbonate (PC) or other opaque materials. However, the present disclosure is not intended to limit the material of the light-isolating portion 140.

[0055] In some embodiments, the first filter layer 160 and the second filter layer 170 can be, for example, filter films or filter paints coated on the cover plate 180. However, the present disclosure is not intended to limit the materials of the first filter layer 160 and the second filter layer 170.

[0056] Please refer to Figure 2 . Figure 2 FIG is a schematic diagram of a backlight module 100 according to an embodiment of the present disclosure. For simplicity of explanation, Figure 2 The circuit board 110, the reflective layer 120 and the light isolation portion 140 are omitted. Figure 2As shown, in this embodiment, the light-emitting module LM is configured to emit light in a first wavelength band L1 and light in a second wavelength band L2. In some embodiments, the light-emitting module LM includes a first light-emitting element LE1 and a second light-emitting element LE2. The first light-emitting element LE1 emits light in the first wavelength band L1, and the second light-emitting element LE2 emits light in the second wavelength band L2. Specifically, the light-emitting module LM does not necessarily need to be implemented with a single light-emitting element capable of emitting light in multiple wavelength ranges; instead, it can be implemented with the first light-emitting element LE1 and the second light-emitting element LE2 capable of emitting monochromatic light. The wavelength of the first wavelength band L1 and the wavelength of the second wavelength band L2 are completely offset. In some embodiments, the wavelength of the first wavelength band L1 is greater than the wavelength of the second wavelength band L2. In some embodiments, the wavelength of the first wavelength band L1 is between 580 nanometers and 780 nanometers, and the wavelength of the second wavelength band L2 is between 435 nanometers and 579 nanometers. In some embodiments, the first wavelength band L1 can be, for example, red light, and the second wavelength band L2 can be, for example, blue light.

[0057] Please continue to refer to Figure 2 .like Figure 2 As shown, in this embodiment, the light shielding layer 150 is configured to block light in the first wavelength band L1 and light in the second wavelength band L2, the first filter layer 160 is configured to block light in the second wavelength band L2, and the second filter layer 170 is configured to block light in the first wavelength band L1. The light shielding layer 150 has a first hollow portion HP1, the first filter layer 160 has a second hollow portion HP2, and the second filter layer 170 has a third hollow portion HP3. The first, second, and third hollow portions HP1, HP2, and HP3 are arranged to correspond to the microstructure group MG of the light guide layer 130. Specifically, in the vertical direction, the first, second, and third hollow portions HP1, HP2, and HP3 are all substantially within the microstructure group MG. The cover plate 180 includes a translucent cover plate 182 and a transparent cover plate 184. The transparent cover plate 184 is disposed on the translucent cover plate 182 , and the translucent cover plate 182 is located between the first filter layer 160 and the transparent cover plate 184 .

[0058] In summary, when the first wavelength band light L1, guided by the microstructure group MG, travels upward and reaches the light shielding layer 150, it is blocked by the light shielding layer 150 and cannot escape from the cover plate 180. When the first wavelength band light L1 travels upward and reaches the first hollow portion HP1 of the light shielding layer 150, it passes through the first hollow portion HP1. Then, when the first wavelength band light L1 passes through the first hollow portion HP1 and reaches the second filter layer 170, it is blocked by the second filter layer 170 and cannot escape from the cover plate 180. If the first wavelength band light L1 passes through the first hollow portion HP1 and reaches the third hollow portion HP3, it will pass through the third hollow portion HP3. Then, when the first wavelength band light L1 passes through the third hollow portion HP3 and reaches the first filter layer 160 or the second hollow portion HP2 , the first wavelength band light L1 will pass through the first filter layer 160 or the second hollow portion HP2 and can be emitted from the cover plate 180 .

[0059] Similarly, when the second wavelength band light L2, guided by the microstructure group MG, travels upward and reaches the light shielding layer 150, it is blocked by the light shielding layer 150 and cannot escape from the cover plate 180. When the second wavelength band light L2 travels upward and reaches the first hollow portion HP1 of the light shielding layer 150, it passes through the first hollow portion HP1. Then, when the second wavelength band light L2 passes through the first hollow portion HP1 and reaches the second filter layer 170 or the third hollow portion HP3, it passes through the second filter layer 170 or the third hollow portion HP3. Then, when the second wavelength band light L2 passes through the second filter layer 170 or the third hollow portion HP3 and reaches the first filter layer 160, it is blocked by the first filter layer 160 and cannot escape from the cover plate 180. If the second wavelength band light L2 passes through the second filter layer 170 or the third hollow portion HP3 and reaches the second hollow portion HP2 , the second wavelength band light L2 will pass through the second hollow portion HP2 and can be emitted from the cover plate 180 .

[0060] In some embodiments, the light-shielding layer 150 may be, for example, a light-shielding black ink. In some embodiments, the first filter layer 160 may be, for example, a light-transmitting red ink. In some embodiments, the second filter layer 170 may be, for example, a light-transmitting blue ink. However, the present disclosure is not intended to limit the colors of the light-shielding layer 150, the first filter layer 160, and the second filter layer 170.

[0061] In some embodiments, the translucent cover 182 may be, for example, a translucent black cover. However, the present disclosure is not intended to be limited to the color of the translucent cover 182. In some embodiments, the transparent cover 184 may be, for example, a colorless transparent cover.

[0062] In some embodiments, the first light emitting element LE1 and the second light emitting element LE2 may be, for example, light emitting diodes (LEDs) or other suitable light sources. However, the present disclosure is not intended to limit the types of the first light emitting element LE1 and the second light emitting element LE2.

[0063] Please refer to Figure 3 . Figure 3 FIG is a schematic diagram of a first pattern PN1, a second pattern PN2, and a third pattern PN3 according to an embodiment of the present disclosure. Figure 3 As shown, in this embodiment, the first filter layer 160 has a first pattern PN1, the second filter layer 170 has a second pattern PN2, and the light shielding layer 150 has a third pattern PN3. The first pattern PN1, the second pattern PN2, and the third pattern PN3 each include a plurality of icons, and the plurality of icons of the first pattern PN1, the second pattern PN2, and the third pattern PN3 correspond to each other in a direction (for example, a vertical direction). Specifically, as Figure 2 as well as Figure 3 As shown, the second hollow portion HP2 of the first filter layer 160 displays the first pattern PN1, the third hollow portion HP3 of the second filter layer 170 displays the second pattern PN2, and the first hollow portion HP1 of the light shielding layer 150 displays the third pattern PN3. Specifically, the third pattern PN3 is composed of at least the union of the first pattern PN1 and the second pattern PN2. In other embodiments, the first hollow portion HP1 of the light shielding layer 150 may also display the first pattern PN1 or the second pattern PN2 to achieve a specific pattern effect.

[0064] Please refer to Figure 4 . Figure 4 FIG. 1 is a schematic diagram of a third graph PN3 according to an embodiment of the present disclosure. Figure 4 As shown in FIG. 1 , in this embodiment, the first hollow portion HP1 is composed of the union of the second hollow portion HP2 and the third hollow portion HP3. The third figure PN3 includes the intersection area ISA of the first figure PN1 and the second figure PN2. Figures 2 to 4 As shown, the intersection area ISA corresponds to the vertical overlap of the first hollow portion HP1, the second hollow portion HP2, and the third hollow portion HP3. Because the intersection area ISA is hollow, the complete second pattern PN2 and first pattern PN1 can only be displayed when the light-emitting module LM emits the first wavelength band light L1 or the second wavelength band light L2, respectively.

[0065] Please refer to Figure 5 . Figure 51 is a schematic diagram showing that the first wavelength band light L1 and the second wavelength band light L2 sequentially pass through the light shielding layer 150 , the second filter layer 170 , and the first filter layer 160 according to one embodiment of the present disclosure. Figure 5 From left to right, the patterns of the light emitted when the first wavelength band light L1 and the second wavelength band light L2 pass through the light shielding layer 150, the second filter layer 170 and the first filter layer 160 in sequence are shown. Figures 2 to 5 As shown, in this embodiment, when the light-emitting module LM itself or the first light-emitting element LE1 of the light-emitting module LM emits a first wavelength band light L1, the first wavelength band light L1 is guided upward by the microstructure group MG of the light-guiding layer 130 and reaches the light-shielding layer 150. The light-shielding layer 150 blocks the first wavelength band light L1 from passing through, while the first hollow portion HP1 allows the first wavelength band light L1 to pass through. As a result, the first wavelength band light L1 presents a third pattern PN3 when passing through the light-shielding layer 150. Next, when the first wavelength band light L1 enters the second filter layer 170 from the light-shielding layer 150, the second filter layer 170 blocks the first wavelength band light L1 from passing through, while the third hollow portion HP3 allows the first wavelength band light L1 to pass through. As a result, the first wavelength band light L1 presents a second pattern PN2 when passing through the second filter layer 170. Next, when the first wavelength band light L1 enters the first filter layer 160 from the second filter layer 170, even if the first filter layer 160 has the second hollow portion HP2 showing the first pattern PN1 (please refer to Figure 2 as well as Figure 3 ), the first filter layer 160 will completely allow the first wavelength band light L1 to pass through, so that the first wavelength band light L1 still presents the second pattern PN2 when passing through the first filter layer 160.

[0066] Similarly, Figures 2 to 5 As shown, when the light-emitting module LM itself or the second light-emitting element LE2 of the light-emitting module LM emits the second wavelength band light L2, the second wavelength band light L2 is guided by the microstructure group MG of the light-guiding layer 130 and travels upward to reach the light-shielding layer 150. The light-shielding layer 150 blocks the second wavelength band light L2 from passing through, while the first hollow portion HP1 allows the second wavelength band light L2 to pass through. As a result, the second wavelength band light L2 presents the third pattern PN3 when passing through the light-shielding layer 150. Next, when the second wavelength band light L2 enters the second filter layer 170 from the light-shielding layer 150, the second filter layer 170 fully allows the second wavelength band light L2 to pass through. As a result, the second wavelength band light L2 still presents the third pattern PN3 when passing through the second filter layer 170. Next, when the second wavelength band light L2 enters the first wavelength filter layer 160 from the second filter layer 170, the first wavelength filter layer 160 will block the second wavelength band light L2 from passing through, while the second hollow portion HP2 allows the second wavelength band light L2 to pass through, so that the second wavelength band light L2 presents the first pattern PN1 when passing through the first filter layer 160.

[0067] Through the above structural configuration, such as Figures 2 to 5 As shown, since the second hollow portion HP2 of the first filter layer 160 and the third hollow portion HP3 of the second filter layer 170 respectively have a first pattern PN1 and a second pattern PN2 that are different from each other, and the intersection area ISA of the first pattern PN1 and the second pattern PN2 corresponds to the overlapping area of ​​the first hollow portion HP1, the second hollow portion HP2, and the third hollow portion HP3, the backlight module 100 only needs to be provided with a single light guide layer 130 to make the first band light L1 and the second band light L2 present different patterns, thereby achieving a single-layer dual-mode effect.

[0068] From the above detailed description of the specific embodiments of the present disclosure, it can be clearly seen that in the backlight module of the present disclosure, since the first hollow portion of the light-shielding layer, the second hollow portion of the first filter layer, and the third hollow portion of the second filter layer are all arranged corresponding to the microstructure group, the first wavelength band light and the second wavelength band light can be guided by the microstructure group to emit upward and present a pattern. In the backlight module of the present disclosure, since the first filter layer with a pattern allows the first wavelength band light to pass through and blocks the second wavelength band light from penetrating, and the second filter layer with a pattern allows the second wavelength band light to pass through and blocks the first wavelength band light from penetrating, the light-emitting module can present different patterns when emitting light of different wavelength bands without the need for an additional light-guiding layer. In summary, the backlight module of the present disclosure can effectively reduce the volume occupied by the entire backlight module.

[0069] Although the present disclosure has been disclosed above in the form of embodiments, it is not intended to limit the present disclosure. Anyone skilled in the art may 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 appended claims.

Claims

1. A backlight module, characterized in that: Include: circuit boards; a light guide layer, disposed above the circuit board and comprising a microstructure group; a light emitting module, disposed on the circuit board and configured to emit light of a first wavelength band and light of a second wavelength band; a light shielding layer, disposed above the light emitting module and having a first hollow portion corresponding to the microstructure group; a cover plate, disposed above the light-shielding layer; A first filter layer is disposed between the light shielding layer and the cover plate and has a second hollow portion corresponding to the microstructure group; as well as The second filter layer is disposed between the light shielding layer and the cover plate and has a third hollow portion corresponding to the microstructure group. The first-band light is guided by the microstructure group and then passes upward through the first hollow portion, the third hollow portion and the first filter layer before emitting from the cover plate, or the second-band light is guided by the microstructure group and then passes upward through the first hollow portion, the second filter layer and the second hollow portion before emitting from the cover plate.

2. The backlight module according to claim 1, wherein: The first filter layer is configured to block the second wavelength band light from penetrating, and the second filter layer is configured to block the first wavelength band light from penetrating.

3. The backlight module according to claim 1, wherein: The second hollow portion presents a first graphic, and the third hollow portion presents a second graphic, wherein the first hollow portion presents one of the following: the first graphic; the second graphic; as well as A third graph is composed of at least the union of the first graph and the second graph.

4. The backlight module according to claim 1, wherein: The light guide layer has a through hole configuration to accommodate the light emitting module.

5. The backlight module according to claim 1, wherein: The invention further comprises a reflective layer disposed between the circuit board and the light guide layer.

6. The backlight module according to claim 5, wherein: The microstructure group is located on a side of the light guide layer close to the light reflecting layer.

7. The backlight module according to claim 1, wherein: The light emitting module includes a first light emitting element and a second light emitting element. The first light emitting element emits light of the first wavelength band, and the second light emitting element emits light of the second wavelength band.

8. The backlight module according to claim 1, wherein: The first filter layer and the second filter layer are filter films or filter paints coated on the cover plate.

9. The backlight module according to claim 1, wherein: The wavelength of the light in the first wavelength band is completely different from the wavelength of the light in the second wavelength band.

10. The backlight module according to claim 1, wherein: The wavelength of the first wavelength band light is within the range of 580 nanometers to 780 nanometers, and the wavelength of the second wavelength band light is within the range of 435 nanometers to 579 nanometers.

Images