TWI493319B - Electronic device - Google Patents

Description

Electronic device

The present invention relates to an electronic device, and more particularly to an electronic device capable of reducing high frequency noise interference.

In the modern information society, computer systems have become an indispensable information tool for most people, and whether it is a desktop PC, a notebook computer or a server, it is moving toward a thin trend. Recently, consumers have become more and more demanding on the portability of notebook computers and multimedia audio and video quality. Therefore, "thin and light", "power saving" and "high resolution" are the trends in the development of notebook computers.

Please refer to FIG. 1 , which is a schematic diagram of an electronic device 100 applied to a notebook computer in the prior art. The electronic device 100 is a cover structure of a notebook computer, and includes a display panel 110, a driving circuit 120, a metal frame 130, an antenna 140, and a housing 150. The driving circuit 120 is electrically connected to the display panel 110 for driving the display panel 110 according to the display data to display an image. The antenna 140 is used to transmit or receive wireless signals. The housing 150 itself has an accommodating space, and the display panel 110, the driving circuit 120, the metal frame 130, and the antenna 140 are disposed in the accommodating space.

Please refer to Figure 1 and Figure 2 together. 2 is a graph of the output energy of the drive circuit 120 and the input energy ratio coupled to the antenna 140 in FIG. 1 in different frequency bands. The horizontal axis represents frequency and the vertical axis represents insertion loss (Insertion Loss). As shown in Fig. 2, at a communication band of 1 GHz, the coupling energy intensity ratio of the antenna 140 received from the drive circuit 120 is -89.2 dB. Since the liquid crystal display panel mostly uses a metal iron frame (that is, the metal frame 130 in FIG. 1) as an external fixing device, the metal frame 130 directly covers the driving circuit 120 and the wiring on the display panel 110, and is in high frequency communication. The wavelength of the signal transmitted on the band is smaller than the size that the metal frame 130 can shield. Therefore, the high-frequency noise energy radiated by the driving circuit 120 or the display panel 110 is propagated by the equivalent waveguide structure formed by the metal frame 130, thereby interfering with the upper edge of the metal frame 130. The antenna 140 thus causes a significant drop in communication quality.

Accordingly, it is an object of the present invention to provide an electronic device which can change the waveguide structure of a metal frame by suitable arrangement of metal conductors to solve the above problems.

According to an embodiment of the invention, an electronic device is provided. The electronic device includes a display panel, a driving circuit, a metal frame and a metal conductor. The display panel has a first surface and a second surface opposite to each other, wherein one of the first surface and the second surface is a display surface of the display panel. The driving circuit is electrically connected to the display panel for driving the display panel to display an image according to the display data. The metal frame is disposed on an edge region of the display panel to fix the display panel, wherein the metal frame further covers the driving circuit and has a waveguide structure. And the metal guiding system is disposed on one side of the second surface corresponding to the display panel for changing the waveguide structure of the metal frame.

Certain terms are used throughout the description and following claims to refer to particular elements. Those of ordinary skill in the art should understand that a hardware manufacturer may refer to the same component by a different noun. The scope of this specification and the subsequent patent application do not use the difference of the names as the means for distinguishing the elements, but the difference in function of the elements as the criterion for distinguishing. The term "including" as used throughout the specification and subsequent claims is an open term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used herein to include any direct and indirect electrical connection means. Therefore, if a first device is coupled to a second device, it means that the first device can be directly electrically connected to the device. The second device is indirectly electrically connected to the second device through other devices or connection means.

Please refer to FIG. 3, which is a schematic diagram of an electronic device 300 according to an embodiment of the present invention. The electronic device 300 includes, but is not limited to, a display panel 310, a driving circuit 320, a metal frame 330, an antenna 340, a housing 350, and a metal conductor 360. The display panel 310 has a first surface and a second surface opposite to each other. In the embodiment, the first surface is a display surface of the display panel 310. The driving circuit 320 is electrically connected to the display panel 310 for driving the display panel 310 according to the display data to display an image. The metal frame 330 is disposed on an edge region of the display panel 310 to fix the display panel 310. The metal frame 330 further covers the driving circuit 320 and has a first waveguide structure Ws1. Antenna 340 is used to transmit or receive wireless signals. The metal conductor 360 is disposed on a side corresponding to the second surface (non-display surface) of the display panel 310 for changing the original first waveguide structure Ws1 of the metal frame 330.

In order to more clearly show the positional relationship between the various components in the electronic device 300, please refer to FIG. 4, which is a cross-sectional view of the electronic device 300 shown in FIG. 3 along a tangent line 4'-4". The display panel 310, the driving circuit 320, the metal frame 330, the antenna 340, and the metal conductor 360 are all disposed in the accommodating space. The first surface A of the display panel 310 is a display surface. The two sides B are not the display surfaces. Note that the positional relationship between the respective elements shown in Fig. 4 is for illustrative purposes only and is not intended to be a limitation of the invention.

Please refer to Figure 3 and Figure 5 together. Figure 5 is a graph of the output energy of drive circuit 320 and the input energy ratio coupled to antenna 340 in Figure 3 of the different frequency bands. The horizontal axis represents frequency and the vertical axis represents insertion loss (Insertion Loss). As shown in FIG. 5, in the communication band 1 GHz, the coupling energy intensity ratio of the antenna 340 received from the driving circuit 320 is -102.1 dB, because the projection of the metal frame 330 on the plane of the metal conductor 360 is The metal conductor 360 is divided into two smaller areas, and the first waveguide structure Ws1 of the metal frame 330 is broken to form a second waveguide structure Ws2 with the metal conductor 360, thereby reducing the electromagnetic energy of the noise transmission on the metal frame 330. The characteristic is that the high frequency noise energy coupled to the antenna 340 is greatly reduced without causing serious interference to the communication quality.

Please note that in another embodiment of the present invention, the display panel 310 can be a liquid crystal display panel, but this is not a limitation of the present invention, and other display devices that can be used to display images are also within the scope of the present invention. In addition, the antenna 340 can be a wireless wide area network (WWAN) antenna, but this is not a limitation of the present invention, and other multi-frequency antennas applicable to electronic devices are also within the scope of the present invention.

Furthermore, the driving circuit 320 can be composed of a plurality of Cascade Modulated Driver Interface (CMDI) source driving chips, and the backlight is backed by a light-emitting diode (LED). On a computer, the serial-modulated driver interface technology can integrate a liquid crystal display (LCD) circuit board and a light-emitting diode driver board into a small piece, and is placed on the lower edge of the liquid crystal display panel. Bend the LCD panel to the back of the panel to reduce the thickness of the panel. In addition, the serial modulation driver interface technology transfers the control signals and power paths originally transmitted by the circuit board and the soft board to the panel glass, and changes the source driver IC to the glass. The structure of the chip on glass (COG) transmits the signal between the source driver ICs in series, which can effectively reduce the area of the circuit board and the soft board, thereby saving the cost of the circuit board and the soft board, and making the entire panel The module becomes lighter and thinner. Please note that this is not a limitation of the present invention, and other driving chips that can drive the image display device are also within the scope of the present invention.

Please refer to FIG. 6. FIG. 6 is a schematic diagram of an electronic device 600 according to another embodiment of the present invention. The electronic device 600 is different from the electronic device 300 in that the metal conductor 660 in the electronic device 600 has a cross-shaped structure.

It should be noted that the above-described embodiments are merely illustrative of the technical features of the present invention and are not intended to limit the scope of the present invention. In the above embodiment, the metal conductor 360 has a "one-word" structure, but this is not a limitation of the present invention. Any metal conductor structure capable of changing the waveguide structure of the metal frame 330 to reduce the noise intensity coupled to the antenna 340, For example, in FIG. 6, the metal conductor 660 is a "cross-shaped" structure, such that the projection of the metal frame 630 on the plane of the metal conductor 660 is divided by the metal conductor 660 into four smaller areas, and such variations are The scope of the invention.

In addition, in another embodiment of the present invention, the metal conductor 360 may also be disposed on a side corresponding to the display surface of the display panel 310, and the metal is changed by using a transparent (transparent) metal material as the metal conductor 360. The frame 330 waveguide structure does not affect the image display function of the display panel 310.

The electronic device disclosed in the present invention can be used to implement the upper cover structure of a notebook computer, wherein the housing 350 is the upper cover of the notebook computer. However, this is only one application of the electronic device disclosed in the present invention, but the present invention is adopted. The disclosed apparatus for applying a metal conductor to change the waveguide structure of a metal frame is within the scope of the present invention.

In summary, the present invention provides an electronic device capable of reducing noise interference. The metal conductor 360 is disposed in the electronic device 300 to change the waveguide structure of the metal frame 330 to reduce the noise intensity coupled to the antenna 340. In addition, the present invention is also applicable to any circuit or device that is subject to high frequency noise interference.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100, 300, 600. . . Electronic device

110, 310, 610. . . Display panel

120, 320, 620‧‧‧ drive circuit

130, 330, 630‧‧ metal frames

140, 340, 640‧‧‧ antenna

150, 350, 650 ‧ ‧ shell

351‧‧‧ accommodating space

360, 660‧‧‧Metal conductor

FIG. 1 is a schematic diagram of an electronic device applied to a notebook computer in the prior art.

Figure 2 is a graph of the output energy of the drive circuit and the input energy ratio coupled to the antenna in Figure 1 for different frequency bands.

Figure 3 is a schematic diagram of an electronic device in an embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view of the electronic device shown in Fig. 3 taken along line 4'-4".

Figure 5 is a graph of the output energy of the drive circuit and the input energy ratio coupled to the antenna in Figure 3 of the different frequency bands.

Figure 6 is a schematic diagram of an electronic device in another embodiment of the present invention.

300. . . Electronic device

310. . . Display panel

320. . . Drive circuit

330. . . metal frame

340. . . antenna

350. . . case

360. . . Metal conductor

Claims (10)

An electronic device includes: a display panel having a first surface and a second surface opposite to each other, wherein one of the first surface and the second surface is a display surface of the display panel; a driving circuit electrically connected to the display panel for driving the display panel to display an image according to the display data; a metal frame disposed at an edge region of the display panel to fix the display panel, wherein the metal frame further covers the driving a circuit having a waveguide structure; and a metal conductor disposed on one side of the second side of the display panel for changing the waveguide structure of the metal frame; wherein the metal frame is located in the metal conductor The projection on the plane is divided into a plurality of regions by the metal conductor. The electronic device of claim 1, further comprising: an antenna for transmitting or receiving the wireless signal; and a housing having an accommodating space; wherein the antenna, the display panel, and the driving circuit The metal frame and the metal conductor are disposed in the accommodating space. The display device of claim 2, wherein the antenna is a Wireless Wide Area Network (WWAN) antenna. The electronic device of claim 2, wherein the display panel is a liquid crystal display panel. The electronic device of claim 4, wherein the driving circuit comprises a plurality of Cascade Modulated Driver Interface (CMDI) source driving chips. The electronic device of claim 4, wherein the housing is an upper cover of a notebook computer. The electronic device of claim 1, wherein the metal frame has a one-word structure. The electronic device of claim 1, wherein the metal frame is a cross-shaped structure. The electronic device of claim 1, wherein the first surface is the display surface of the display panel. The electronic device of claim 1, wherein the second surface is the display surface of the display panel.