Backlight module

Abstract

The invention discloses a backlight module which comprises a driving circuit substrate, a plurality of light-emitting elements and an antenna. The driving circuit substrate has a light-emitting element driving circuit. The plurality of light-emitting elements are arranged on the driving circuit substrate and are electrically connected to the light-emitting element driving circuit. The antenna is arranged on the driving circuit substrate.

Description

Technical Field

[0001] The invention relates to an optical module, and in particular to a backlight module. Background Art

[0002] Near Field Communication (NFC) technology allows two electronic devices equipped with antenna functions to communicate wirelessly within a few centimeters of each other. This contactless data exchange mechanism has the advantages of high response speed, high security, and convenience. Therefore, in recent years, many products on the market have integrated near-field wireless communication functions, such as electronic tickets (such as EasyCard, etc.), electronic payment devices (such as smart phones, smart watches, etc.). Users only need to bring an object with a near-field wireless communication tag (NFC tag) close to the card reader (NFC reader) to complete identity authentication and data exchange in a short time, providing users with a more convenient lifestyle. In recent years, in order to enhance the added value of display devices, the antenna used for near-field wireless communication technology is integrated into the backlight module of the display device. However, the magnetic field is not easy to penetrate the drive circuit substrate of the backlight module used to drive the light-emitting element, which affects the realization of the wireless communication function. Summary of the invention

[0003] The invention provides a backlight module with good antenna function.

[0004] A backlight module according to an embodiment of the present invention includes a driving circuit substrate, a plurality of light-emitting elements, an antenna, and a magnetic conductive element. The driving circuit substrate has a light-emitting element driving circuit. A plurality of light-emitting elements are arranged on the driving circuit substrate and are electrically connected to the light-emitting element driving circuit. The antenna is arranged on the driving circuit substrate. The magnetic conductive element overlaps the antenna. The antenna is arranged between the light-emitting element driving circuit and the magnetic conductive element, or the magnetic conductive element is arranged between the antenna and the light-emitting element driving circuit of the driving circuit substrate.

[0005] A backlight module according to an embodiment of the present invention includes a driving circuit substrate, a plurality of light-emitting elements and an antenna. The driving circuit substrate has a light-emitting element driving circuit. The plurality of light-emitting elements are arranged on the driving circuit substrate and are electrically connected to the light-emitting element driving circuit. The antenna is arranged on the driving circuit substrate. The driving circuit substrate has an antenna coverage area overlapping the antenna, and the light-emitting element driving circuit has a hollow portion in the antenna coverage area. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present invention.

[0007] Figure 2 It is a cross-sectional schematic diagram of a backlight module according to another embodiment of the present invention.

[0008] Figure 3 It is a top view and perspective diagram of an antenna, a magnetic conductive element, a reflective sheet and a plurality of light emitting elements of a backlight module according to another embodiment of the present invention.

[0009] Figure 4 It is a cross-sectional schematic diagram of a backlight module according to another embodiment of the present invention.

[0010] Wherein, the reference numerals are:

[0011] 10, 10A, 10B: Backlight module

[0012] 100: driving circuit substrate

[0013] 100a: first surface

[0014] 100b: second surface

[0015] 100c: Antenna coverage area

[0016] 100d: Non-antenna coverage area

[0017] 100e: Light emitting element setting area

[0018] 100f: Non-luminous element setting area

[0019] 110: Light emitting element driving circuit

[0020] 112: Hollow

[0021] 120: first dielectric layer

[0022] 130: second dielectric layer

[0023] 200: Light emitting element

[0024] 300, 300A: Antenna

[0025] 400:Reflective sheet

[0026] 410, 620: Opening

[0027] 500, 500A, 500B: Magnetic element

[0028] 510: Mesh

[0029] 600: Shell

[0030] 610: Accommodation space

[0031] 700: Bridge element

[0032] 800: Antenna pad

[0033] 900: Light emitting element driver chip

[0034] R: Layout range DETAILED DESCRIPTION

[0035] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0036] It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it may be directly on or connected to another element, or an intermediate element may also exist. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intermediate elements. As used herein, "connection" may refer to physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" may refer to the presence of other elements between two elements.

[0037] As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable deviation range of the particular value determined by one of ordinary skill in the art, taking into account the measurement in question and the particular amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, as used herein, "about", "approximately", or "substantially" can select a more acceptable deviation range or standard deviation depending on the optical property, etching property or other property, and can apply to all properties without a single standard deviation.

[0038] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted as an idealized or overly formal meaning unless explicitly defined as such herein.

[0039] Figure 1 It is a cross-sectional schematic diagram of a backlight module according to an embodiment of the present invention.

[0040] Please refer to Figure 1, the backlight module 10 includes a driving circuit substrate 100 and a plurality of light-emitting elements 200. The driving circuit substrate 100 has a light-emitting element driving circuit 110. The plurality of light-emitting elements 200 are disposed on the driving circuit substrate 100 and are electrically connected to the light-emitting element driving circuit 110. For example, in some embodiments, the driving circuit substrate 100 may be a rigid printed circuit substrate. However, the present invention is not limited thereto, and in other embodiments, the driving circuit substrate 100 may also be a flexible circuit substrate. In some embodiments, the plurality of light-emitting elements 200 are, for example, mini light-emitting diodes (mini LEDs). However, the present invention is not limited thereto, and in other embodiments, the plurality of light-emitting elements 200 may also be light-emitting elements of other types and / or sizes.

[0041] In some embodiments, the backlight module 10 may further selectively include a reflective sheet 400 disposed on the driving circuit substrate 100. The reflective sheet 400 has a plurality of openings 410. The plurality of light emitting elements 200 pass through the plurality of openings 410 of the reflective sheet 400 respectively.

[0042] The backlight module 10 further includes an antenna 300 disposed on the driving circuit substrate 100. In some embodiments, the antenna 300 is used to implement near field wireless communication (NFC). The driving circuit substrate 100 has a first surface 100a facing the plurality of light-emitting elements 200 and a second surface 100b facing away from the plurality of light-emitting elements 200. In some embodiments, the antenna 300 can be selectively attached to the second surface 100b of the driving circuit substrate 100, and the second surface 100b of the driving circuit substrate 100 is located between the first surface 100a of the driving circuit substrate 100 and the antenna 300, but the present invention is not limited thereto.

[0043] The driving circuit substrate 100 has an antenna coverage area 100c overlapping the antenna 300. The boundary of the antenna coverage area 100c of the driving circuit substrate 100 is aligned with the outer edge of the antenna 300. It is worth noting that the light emitting element driving circuit 110 of the driving circuit substrate 100 has a hollow portion 112 in the antenna coverage area 100c. In other words, the light emitting element driving circuit 110 is relatively fragmented in the antenna coverage area 100c, which is conducive to the magnetic field energy transfer of the antenna 300.

[0044] In some embodiments, the driving circuit substrate 100 further has a non-antenna coverage area 100d, which is located outside the area of ​​the antenna 300, and the distribution density of the light-emitting element driving circuit 110 in the antenna coverage area 100c is less than the distribution density of the light-emitting element driving circuit 110 in the non-antenna coverage area 100d. In other words, the magnetic field penetration of the light-emitting element driving circuit 110 in the antenna coverage area 100c is greater than the magnetic field penetration of the light-emitting element driving circuit 110 in the non-antenna coverage area 100d. With this design, the arrangement of the light-emitting element driving circuit 110 and the improvement of magnetic field energy transfer can be taken into account.

[0045] In some embodiments, the backlight module 10 may further selectively include a magnetic conductive element 500, which overlaps the antenna 300. The magnetic conductive element 500 has a high magnetic permeability, can block interference from metal conductors, and maintain the magnetic field transmission capability of the antenna 300. For example, in some embodiments, the material of the magnetic conductive element 500 includes ferrite, but the present invention is not limited thereto.

[0046] In some embodiments, the antenna 300 is disposed between the light emitting element driving circuit 110 and the magnetic conductive element 500, and the plurality of light emitting elements 200 and the antenna 300 are respectively located on opposite sides of the driving circuit substrate 100. In some embodiments, the magnetic conductive element 500 can be selectively attached to the second surface 100b of the driving circuit substrate 100, and the antenna 300 is disposed between the light emitting element driving circuit 110 and the magnetic conductive element 500. In some embodiments, since the magnetic conductive element 500 is attached to the second surface 100b of the driving circuit substrate 100 and is located under the antenna 300, the magnetic conductive element 500 can be arbitrarily replaced according to actual needs.

[0047] In some embodiments, the backlight module 10 further includes a housing 600, the housing 600 defines a housing space 610, and the driving circuit substrate 100, the plurality of light-emitting elements 200, and the antenna 300 are disposed in the housing space 610. In some embodiments, the housing 600 may selectively have an opening 620, and a connecting element (not shown) may pass through the opening 620 of the housing 600 to electrically connect the antenna 300 to an external wireless communication circuit (not shown). However, the present invention is not limited thereto, and in other embodiments, the housing 600 may not have the opening 620.

[0048] It must be noted that the following embodiments use the component numbers and some contents of the previous embodiments, wherein the same number is used to represent the same or similar components, and the description of the same technical contents is omitted. The description of the omitted parts can refer to the previous embodiments, and the following embodiments will not be repeated.

[0049] Figure 2It is a cross-sectional schematic diagram of a backlight module according to another embodiment of the present invention. Figure 3 It is a top view and perspective diagram of an antenna, a magnetic conductive element, a reflective sheet and a plurality of light emitting elements of a backlight module according to another embodiment of the present invention.

[0050] Please refer to Figure 1 and Figure 2 The backlight module 10A of the present embodiment is similar to the aforementioned backlight module 10 , and the main difference between the two is that the antennas 300 , 300A and the magnetic conductive elements 500 , 500A are disposed at different locations and / or in different shapes.

[0051] Please refer to Figure 2 In this embodiment, the magnetic conductive element 500A is disposed between the antenna 300A and the light emitting element driving circuit 110 of the driving circuit substrate 100. Specifically, in this embodiment, the magnetic conductive element 500A is disposed on the first surface 100a of the driving circuit substrate 100, the antenna 300A is disposed on the magnetic conductive element 500A, the reflective sheet 400 is disposed on the antenna 300A, the magnetic conductive element 500A is disposed between the antenna 300A and the first surface 100a of the driving circuit substrate 100, and the antenna 300A is disposed between the reflective sheet 400 and the magnetic conductive element 500A. In this embodiment, the reflective sheet 400, the antenna 300A and the magnetic conductive element 500A can be attached to the first surface 100a of the driving circuit substrate 100.

[0052] Please refer to Figure 2 and Figure 3 In this embodiment, the first surface 100a of the driving circuit substrate 100 has a light emitting element setting area 100e and a non-light emitting element setting area 100f, the light emitting element 200 is set on the light emitting element setting area 100e of the first surface 100a of the driving circuit substrate 100, and the antenna 300A and the magnetic conductive element 500A are set on the non-light emitting element setting area 100f of the first surface 100a of the driving circuit substrate 100. In this embodiment, since the antenna 300A, the magnetic conductive element 500A and the light emitting element 200 are all set on the first surface 100a of the driving circuit substrate 100, the antenna 300A and the magnetic conductive element 500A are set to avoid multiple light emitting elements 200, and the antenna 300A and the magnetic conductive element 500A are located between the multiple light emitting elements 200.

[0053] Please refer to Figure 2 and Figure 3In this embodiment, the magnetic conductive element 500A may be mesh-shaped and have a plurality of mesh holes 510, and at least a portion of the plurality of light-emitting elements 200 are disposed in the plurality of mesh holes 510 of the magnetic conductive element 500A. In this embodiment, the plurality of mesh holes 510 of the magnetic conductive element 500A may be respectively located under the plurality of openings 410 of the reflective sheet 400. In this embodiment, the mesh holes 510 of the magnetic conductive element 500A and the openings 410 of the reflective sheet 400 may be substantially aligned, but the present invention is not limited thereto.

[0054] Please refer to Figure 3 , the magnetic conductive element 500A overlaps with the antenna 300A, and the antenna 300A may be located within the area of ​​the magnetic conductive element 500A. In this embodiment, the area of ​​the magnetic conductive element 500A may be larger than the area of ​​the antenna 300A. For example, in this embodiment, the area of ​​the magnetic conductive element 500A that exceeds the arrangement range R of the antenna 300A may fall within 10% to 20% of the area of ​​the arrangement range R of the antenna 300A, but the present invention is not limited thereto.

[0055] Please refer to Figure 2 In addition, in the present embodiment, the backlight module 10A further includes a bridge element 700 and an antenna pad 800. The antenna pad 800 is disposed on the second surface 100b of the driving circuit substrate 100. The bridge element 700 electrically connects the antenna 300A located on the first surface 100a and the antenna pad 800 located on the second surface 100b. In the present embodiment, the bridge element 700 is, for example, a flexible printed circuit substrate, but the present invention is not limited thereto. In the present embodiment, the backlight module 10A further includes a light-emitting element driver chip 900. The light-emitting element driver chip 900 is electrically connected to the light-emitting element driving circuit 110. The light-emitting element driver chip 900 can be selectively disposed on the second surface 100b of the driving circuit substrate 100, but the present invention is not limited thereto.

[0056] Figure 4 FIG. 2 is a cross-sectional diagram of a backlight module according to another embodiment of the present invention. Figure 2 and Figure 4 The backlight module 10B of this embodiment is similar to the aforementioned backlight module 10A, and the main difference between the two is that the locations and / or shapes of the magnetic conductive elements 500A and 500B are different.

[0057] Please refer to Figure 4Specifically, in the present embodiment, the magnetic conductive element 500B is integrated into the driving circuit substrate 100 and is located between the first surface 100a and the second surface 100b of the driving circuit substrate 100. For example, in the present embodiment, the driving circuit substrate 100 further has a first dielectric layer 120 and a second dielectric layer 130, the first dielectric layer 120 is disposed on the light emitting element driving circuit 110, the magnetic conductive element 500B is disposed on the first dielectric layer 120, the second dielectric layer 130 covers the magnetic conductive element 500B, and the magnetic conductive element 500B is located between the first dielectric layer 120 of the driving circuit substrate 100 and the second dielectric layer 130 of the driving circuit substrate 100.

[0058] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A backlight module, characterized in that: include: A driving circuit substrate having a light emitting element driving circuit; A plurality of light emitting elements are disposed on the driving circuit substrate and electrically connected to the light emitting element driving circuit; An antenna is disposed on the driving circuit substrate; as well as a magnetic conductive element overlapping the antenna; The antenna is arranged between the light emitting element driving circuit and the magnetic conductive element, or the magnetic conductive element is arranged between the antenna and the light emitting element driving circuit of the driving circuit substrate.

2. The backlight module according to claim 1, wherein: The driving circuit substrate has an antenna covering area overlapping the antenna, and the light emitting element driving circuit has a hollow part in the antenna covering area.

3. The backlight module according to claim 1, wherein: The driving circuit substrate has an antenna coverage area and a non-antenna coverage area, the antenna coverage area of ​​the driving circuit substrate overlaps the antenna, the non-antenna coverage area of ​​the driving circuit substrate is located outside the area of ​​the antenna, and a distribution density of the light-emitting element driving circuit in the antenna coverage area is less than a distribution density of the light-emitting element driving circuit in the non-antenna coverage area.

4. The backlight module according to claim 1, wherein: The antenna is arranged between the light emitting element driving circuit and the magnetic conductive element, and the light emitting elements and the antenna are respectively located on two opposite sides of the driving circuit substrate.

5. The backlight module according to claim 1, wherein: The driving circuit substrate has a first surface facing the light-emitting elements, the first surface has a light-emitting element setting area and a non-light-emitting element setting area, the light-emitting elements are set on the light-emitting element setting area of ​​the first surface of the driving circuit substrate, and the antenna is set on the non-light-emitting element setting area of ​​the first surface of the driving circuit substrate.

6. The backlight module according to claim 5, characterized in that: The magnetic conductive element is arranged between the antenna and the first surface of the driving circuit substrate.

7. The backlight module according to claim 6, wherein: The magnetic conductive element is in a mesh shape and has a plurality of mesh holes, and at least a portion of the light emitting elements are disposed in the mesh holes of the magnetic conductive element.

8. The backlight module according to claim 6, wherein: Also includes: A reflector is disposed on the first surface of the driving circuit substrate, wherein the antenna is located between the reflector and the magnetic conductive element, the reflector has a plurality of openings, the light-emitting elements are respectively disposed in the openings of the reflector, the magnetic conductive element is mesh-shaped and has a plurality of mesh holes, and the mesh holes of the magnetic conductive element are respectively located under the openings of the reflector.

9. The backlight module according to claim 5, wherein: The driving circuit substrate further has a second surface facing away from the light-emitting elements. The magnetic conductive element is integrated into the driving circuit substrate and is located between the first surface and the second surface of the driving circuit substrate.

10. The backlight module according to claim 1, wherein: The driving circuit substrate further has a first dielectric layer and a second dielectric layer, the first dielectric layer is arranged on the light-emitting element driving circuit, the magnetic conductive element is arranged on the first dielectric layer, the second dielectric layer covers the magnetic conductive element, and the magnetic conductive element is located between the first dielectric layer of the driving circuit substrate and the second dielectric layer of the driving circuit substrate.

11. A backlight module, characterized in that: include: A driving circuit substrate having a light emitting element driving circuit; A plurality of light emitting elements are disposed on the driving circuit substrate and electrically connected to the light emitting element driving circuit; as well as An antenna is disposed on the driving circuit substrate; The driving circuit substrate has an antenna covering area overlapping the antenna, and the light emitting element driving circuit has a hollow portion in the antenna covering area.

12. The backlight module according to claim 11, wherein: The driving circuit substrate further has a non-antenna coverage area, which is located outside the area of ​​the antenna, and a distribution density of the light-emitting element driving circuit in the antenna coverage area is smaller than a distribution density of the light-emitting element driving circuit in the non-antenna coverage area.

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