CN201311297Y - Electronic device and navigation device - Google Patents

Abstract

The utility model relates to an electronic device and navigation head. The electronic device includes a display, a Frequency Modulation (FM) module, and a coupling element. The display includes a display metal frame. The coupling element is electrically connected to the frequency modulation module and partially overlapped with the display metal frame, so that a capacitor structure is formed between the coupling element and the display metal frame.

Description

Electronic devices and navigation devices

technical field

The utility model relates to an electronic device, in particular to an electronic device using a display metal frame as a frequency modulation antenna.

Background technique

FM (Frequency Modulation, FM) wireless system is widely used in vehicle electronics. For example, the navigation device can use FM wireless transmission, so that the car audio system can receive the broadcast as voice navigation with FM, or the remote control of the navigation device FM frequency band can also be used for wireless connection. For example, the navigation device uses the frequency band 107.8 MHz as a voice navigation broadcast in the form of an overlay. In this way, you can know various information of voice navigation through the audio in the car.

However, the traditional navigation device must additionally design an antenna to receive the FM wireless signal. As a result, developers need to struggle to find a place for the antenna in the limited space. In addition, the antenna of the traditional navigation device is not conducive to reducing the overall size of the navigation device. Furthermore, purchasing additional antennas will increase the production cost and product weight, which is detrimental to the market competitiveness of the product.

Utility model content

The purpose of this utility model is to provide an electronic device, which can use its own existing metal frame of the display as a frequency modulation antenna, so that the research and development personnel do not need to bother to find a place for the antenna in the limited space; In addition, it will help reduce the overall volume of the product and reduce the production cost and product weight without purchasing additional antennas, so as to improve the market competitiveness of the product.

According to one aspect of the present invention, an electronic device is proposed, which is characterized in that it includes: a display, the display includes: a metal frame of the display; a frequency modulation module; and a coupling element electrically connected to the frequency modulation module and connected to the frequency modulation module The metal frame of the display partially overlaps, so that a capacitive structure is formed between the coupling element and the metal frame of the display.

According to another aspect of the present invention, a navigation device is proposed, which is characterized in that it includes: a display, the display includes: a metal frame of the display; a frequency modulation module; and a coupling element electrically connected to the frequency modulation module, And partially overlap with the metal frame of the display, so that a capacitive structure is formed between the coupling element and the metal frame of the display.

Preferably, the area of the coupling element is 1/8 to 1/16 of the metal frame of the display.

Preferably, the coupling element is a flexible circuit board.

Preferably, the area of the coupling element is just such that the wireless signal in the FM band passes through the capacitive structure.

Preferably, the coupling element is arranged on the outer surface of the metal frame of the display.

Preferably, the coupling element is arranged on the inner surface of the metal frame of the display.

Preferably, the electronic device further includes a transmission line.

Preferably, the transmission line is a single-core line.

Preferably, the peripheral length of the metal frame of the display is greater than 80mm.

Compared with the prior art, the utility model has the beneficial effects that it is not necessary to bother to find a place for the antenna in a limited space, which is beneficial to reduce the overall volume of the product, reduce the production cost and product weight, In order to improve product market competitiveness, all grounded metal parts in electronic devices or navigation devices are part of the FM antenna, which greatly improves the overall wireless performance, has the largest radar cross-sectional area, and greatly improves radio frequency electromagnetic compatibility.

Description of drawings

In order to make the above content of the utility model more obvious and understandable, the preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of an electronic device according to a preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of the first type of external antenna.

Fig. 3 is a measurement chart of the received signal strength indication of the first external antenna.

Fig. 4 is a schematic diagram of the second type of external antenna.

Fig. 5 is a measurement chart of the received signal strength indication of the second external antenna.

Fig. 6 is a measurement diagram of a received signal strength indicator whose area of the coupling element of the present invention is 1/16 of the metal frame of the display.

Fig. 7 is a measurement diagram of a received signal strength indicator whose area of the coupling element of the present invention is 1/8 of the metal frame of the display.

Fig. 8 is the measurement result of the attenuation value of the first external antenna.

Fig. 9 is the measurement result of the attenuation value of the second external antenna.

Fig. 10 is the measurement result of the attenuation value when the area of the coupling element of the present invention is 1/16 of the metal frame of the display.

Fig. 11 is the measurement result of the attenuation value when the area of the coupling element of the present invention is 1/8 of the metal frame of the display.

Detailed ways

Please refer to FIG. 1 , which shows a schematic diagram of an electronic device according to a preferred embodiment of the present invention. The electronic device 10 is, for example, a navigation device, and the electronic device 10 includes a display 110 , a coupling element 120 , a frequency modulation (FM) module 130 and a transmission line 140 . The display 110 includes a display metal frame 112 . The transmission line 140 is, for example, a single core line, and the transmission line 140 electrically connects the frequency modulation module 130 to the coupling element 120 . The coupling element 120 is, for example, a flexible printed circuit (FPC). The coupling element 120 is electrically connected to the frequency modulation module 130 through the transmission line 140 , and partially overlaps the display metal frame 112 , so that a capacitive structure is formed between the coupling element 120 and the display metal frame 112 .

In order to prevent electrostatic discharge (ESD) and suppress display noise, the metal frame 112 of the display is generally grounded. Therefore, in the traditional practice, the display metal frame 112 is not used as an FM antenna. Furthermore, since the display 110 is the main source of noise, the metal frame 112 of the display carries a certain amount of noise energy. If the display metal frame 112 is directly connected to the frequency modulation module 130 , it will seriously affect the normal operation of the frequency modulation module 130 .

In order to overcome the above problems, the capacitor structure formed between the coupling element 120 and the metal frame 112 of the display is used to isolate the DC component and the RF energy of the non-operating frequency band. In this way, the display metal frame 112 with the grounding function can be safely used as the FM antenna of the electronic device 10 . In addition, when using the display metal frame 112 as the FM antenna of the electronic device 10, since the display metal frame 112 is grounded, the grounded metal parts in the entire electronic device 10 will become a part of the FM antenna, and greatly Improve overall wireless performance. Furthermore, the display 110 occupies the largest area in the electronic device 10 , so using the display metal frame 112 as the FM antenna will have the largest radar cross-sectional area.

Moreover, since all the grounding parts of the electronic device 10 are FM antennas, the noise potential of the electronic device 10 is equal to the interference potential coupled to the antenna radiator. In this way, the two potentials are exactly the same without generating a potential difference, let alone generating a noise current, so as to fundamentally solve the problem of radio frequency electromagnetic compatibility.

The above-mentioned coupling element 120 may be disposed on the outer surface of the metal frame 112 of the display as shown in FIG. 1 . Alternatively, disposing the coupling element 120 on the inner surface of the metal frame 112 of the display can also achieve the same effect. In order to make the 88Mhz to 108MHz FM wireless signal pass through the capacitive structure formed between the coupling element 120 and the display metal frame 112 , the area of the coupling element 120 is preferably 1/8 to 1/16 of the display metal frame 112 . Since the FM antenna has a non-resonant structure, when the surrounding length of the metal frame 112 of the display is greater than 80 mm, the wireless signal can be sent and received well.

Please refer to Figure 2 to Figure 7 at the same time, Figure 2 is a schematic diagram of the first type of external antenna, Figure 3 is a measurement diagram of the received signal strength indicator of the first type of external antenna, Figure 4 is a schematic diagram of the second type of external antenna, Figure 5 It is the measurement diagram of the received signal strength indication of the second external antenna. Fig. 6 is a measurement diagram of the received signal strength indication whose area of the coupling element of the present invention is 1/16 of the metal frame of the display. Fig. 7 is the coupling element of the present invention The area of the display is 1/8 of the metal frame of the measurement chart of the received signal strength indication. It can be seen from Figure 2 to Figure 7 that no matter the area of the coupling element of the present invention is 1/8 or 1/16 of the metal frame of the display, its Received Signal Strength Index (RSSI) is better than that of Figure 2 and Figure 7. Figure 4 shows the external antenna.

Please refer to Fig. 8 to Fig. 11 simultaneously, Fig. 8 is the measurement result of the attenuation value of the first kind of external antenna, Fig. 9 is the measurement result of the attenuation value of the second kind of external antenna, Fig. 10 is that the area of the coupling element of the present invention is The measurement result of the attenuation value of 1/16 of the metal frame of the display, Fig. 11 is the measurement result of the attenuation value of 1/8 of the display metal frame with the area of the coupling element of the present invention. Larger attenuation values shown in Figures 8 to 11 represent better sensitivity. It can be seen from Fig. 8 to Fig. 11 that no matter the area of the coupling element of the present invention is 1/8 or 1/16 of the metal frame of the display, its sensitivity is better than that of the external antenna shown in Fig. 2 and Fig. 4 .

The electronic device and navigation device disclosed in the above-mentioned embodiments of the present invention at least include the following advantages:

1. R&D personnel do not need to find a place for the antenna in the limited space.

Second, it is beneficial to reduce the overall volume of the product.

3. Reduce production cost and product weight to improve product market competitiveness.

4. All grounded metal parts in the electronic device or navigation device are part of the FM antenna, which greatly improves the overall wireless performance.

5. It has the largest radar cross-sectional area.

6. Significantly improve radio frequency electromagnetic compatibility.

In summary, although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the utility model belongs can make various equivalent changes or substitutions without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present utility model should be defined by the attached claims of the application.

Claims (20)

1. An electronic device, characterized in that it comprises: a display, comprising: A display metal frame; a frequency modulation module; and A coupling element is electrically connected to the frequency modulation module and partially overlaps with the metal frame of the display, so that a capacitive structure is formed between the coupling element and the metal frame of the display. 2. The electronic device according to claim 1, wherein an area of the coupling element is 1/8 to 1/16 of the metal frame of the display. 3. The electronic device according to claim 1, wherein the coupling element is a flexible circuit board. 4. The electronic device according to claim 1, wherein the area of the coupling element is just such that the wireless signal of the FM band passes through the capacitive structure. 5. The electronic device according to claim 4, wherein the coupling element is a flexible circuit board. 6. The electronic device according to claim 1, wherein the coupling element is disposed on an outer surface of the metal frame of the display. 7. The electronic device according to claim 1, wherein the coupling element is disposed on an inner surface of the metal frame of the display. 8. The electronic device according to claim 1, further comprising a transmission line. 9. The electronic device according to claim 8, wherein the transmission line is a single-core line. 10. The electronic device according to claim 1, wherein the peripheral length of the metal frame of the display is greater than 80 mm. 11. A navigation device, characterized in that it comprises: a display, comprising: A display metal frame; a frequency modulation module; and A coupling element is electrically connected to the frequency modulation module and partially overlaps with the metal frame of the display, so that a capacitive structure is formed between the coupling element and the metal frame of the display. 12. The navigation device according to claim 11, wherein the area of the coupling element is 1/8 to 1/16 of the metal frame of the display. 13. The navigation device according to claim 11, wherein the coupling element is a flexible circuit board. 14. The navigation device according to claim 11, wherein the area of the coupling element is just such that the wireless signal in the FM frequency band passes through the capacitive structure. 15. The navigation device according to claim 14, wherein the coupling element is a flexible circuit board. 16. The navigation device according to claim 11, wherein the coupling element is disposed on an outer surface of the metal frame of the display. 17. The navigation device according to claim 11, wherein the coupling element is disposed on an inner surface of the metal frame of the display. 18. The navigation device according to claim 11, further comprising a transmission line. 19. The navigation device according to claim 18, wherein the transmission line is a single-core line. 20. The navigation device according to claim 11, wherein the peripheral length of the metal frame of the display is greater than 80mm.

Images