TWI753265B - Electronic apparatus - Google Patents

Abstract

A display apparatus is provided, which includes a display panel, a display driving chip and a connection component. The display driver chip is coupled to the display panel. A signal trace of the connection component has a first portion and a second portion, in which the first portion is arranged for receiving an image data signal, and the second portion is coupled to the display driving chip. The impedence per unit of the second portion of the signal trace is greater than that that of the first portion of the signal trace.

Description

electronic device

The present invention refers to an electronic device, and particularly to an electronic device that can reduce the interference of image data signal transmission to wireless communication.

For an electronic device with a display panel, the display driving circuit usually receives the image data signal through the printed circuit board, processes the image data signal and outputs it to the display panel, so that the display panel can display the picture accordingly. In addition, many electronic devices, especially mobile electronic devices, have both screen display and wireless communication functions, such as cellular mobile communication, wireless local area network (WLAN) communication, and bluetooth communication. , near field communication (near field communication; NFC), global navigation satellite system (global navigation satellite system; GNSS) positioning, etc. In some common electronic devices, the application processor transmits the image data signal to the display driving circuit through the flexible printed circuit board. However, the electric field generated by the flexible printed circuit board when transmitting signals may interfere with the wireless communication, resulting in a decrease in the sensitivity of the wireless communication.

The purpose of the present invention is to provide an electronic device which can effectively reduce the interference to wireless communication during the transmission of image data signals and ensure the quality of wireless communication.

One aspect of the present invention relates to an electronic device including a display panel, a display driving chip and a connecting component. The display driver chip is coupled to the display panel. The connecting component has a first part and a second part, wherein the first part is used for receiving the image data signal, and the second part is coupled to the display driving chip. The impedance value per unit length of the signal traces of the second part is greater than the impedance value per unit length of the signal traces of the first part.

According to one or more embodiments of the present invention, the width of the signal traces of the second portion is smaller than the width of the signal traces of the first portion.

According to one or more embodiments of the present invention, the above-mentioned display driver chip is a touch with display driver integration (TDDI) chip.

According to one or more embodiments of the present invention, the display driving chip is directly disposed on the display panel.

According to one or more embodiments of the present invention, the connecting member is a flexible printed circuit (FPC) or a flexible flat cable (FFC).

According to one or more embodiments of the present invention, the above-mentioned connecting member further includes a flexible substrate. In the first part of the connection part, the signal trace and the ground trace of the connection part are located on opposite sides of the flexible substrate, and in the second part of the connection part, the signal trace and the ground trace of the connection part are located on opposite sides of the flexible substrate. The wires are on the same side of the flexible substrate.

According to one or more embodiments of the present invention, the electronic device further includes an application processor, which is coupled to the second portion of the connecting member and used to provide the image data signal.

According to one or more embodiments of the present invention, the signal transmission between the application processor and the display driver chip conforms to the Display Serial Interface (Display Serial Interface) defined by the Mobile Industry Processor Interface (MIPI) alliance. ; DSI) specifications.

According to one or more embodiments of the present invention, the electronic device further includes a wireless communication module for transmitting or receiving wireless signals.

According to one or more embodiments of the present invention, the wireless communication module is a cellular mobile communication module, a wireless local area network (WLAN) module, a bluetooth module, a near- A near field communication (NFC) module or a global navigation satellite system (GNSS) module.

100‧‧‧Electronic Devices

110‧‧‧Display panel

120‧‧‧Driver Display Chip

130‧‧‧Wireless Communication Module

140‧‧‧Application Processors

150‧‧‧Connecting parts

150A‧‧‧First Section

150B‧‧‧Second Section

150C‧‧‧Second Section

152‧‧‧Flexible substrate

154‧‧‧Signal traces

156‧‧‧Ground trace

W1, W2‧‧‧Width

For a more complete understanding of the embodiments and their advantages, reference is now made to the following description in conjunction with the accompanying drawings, wherein: [FIG. 1] is a schematic diagram of an electronic device according to an embodiment of the present invention; [FIG. 2] is a schematic diagram according to some examples A partial structural side view of the electronic device of [Fig. 1]; [FIG. 3] is a schematic partial plan view of the connecting member of [FIG. 2]; [FIG. 4A] and [FIG. 4B] are different examples of enlarged plan views of a partial area of the area connecting member of [FIG. 3]; and [FIG. 5] ] is the impedance distribution curve diagram of the connecting parts of the embodiment and the comparative example of the present invention.

The following will clearly illustrate the spirit of the present disclosure with drawings and detailed descriptions. Anyone with ordinary knowledge in the technical field can, after understanding the preferred embodiments of the present disclosure, be able to make changes and modifications by the techniques taught in the present disclosure. modifications, which do not depart from the spirit and scope of this disclosure.

The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the claims. Unless otherwise limited, the singular form "a" or "the" may also be used to refer to the plural form. In addition, the use of spatially relative terms is intended to describe different orientations of elements in use or operation, and is not limited to the orientation shown in the drawings. Elements may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein may be interpreted in the same manner.

For simplicity and clarity of illustration, reference numerals and/or letters may be repeated herein among various embodiments, but this does not imply a causal relationship between the various embodiments and/or configurations discussed.

In addition, spatially relative terms, such as "over", "on", "under", "below", etc., may be used in this document to facilitate the description as shown in the drawings. an element shown or the relationship of a feature to another element or feature. These spatially relative terms are intended to encompass different orientations of the elements in use or operation other than the orientation depicted in the figures.

Please refer to FIG. 1 , which is a schematic diagram of an electronic device 100 according to an embodiment of the present invention. The electronic device 100 is a device having a display screen and wireless communication functions, such as a tablet computer, a smart phone, etc., but not limited thereto. The electronic device 100 includes a display panel 110 , a display driver chip 120 , a wireless communication module 130 and an application processor 140 .

The display panel 110 is used for displaying images, which can be any type of liquid crystal display panel, inorganic or organic light emitting diode display panel, or other suitable display panels.

The display driving chip 120 is coupled to the display panel 110, and is used for processing the image data signal and then outputting pixel signals to the display panel 110, so that the display panel 110 can display a picture accordingly. The display driving chip 120 includes a data driving circuit for sequentially outputting pixel signals for the image data signals to each pixel row or pixel column of the display panel 110 . In some embodiments, the display driver chip 120 further includes a scan driver circuit, a timing control circuit, and the like, that is, the display driver chip 120 is a chip that integrates functions such as data driving, scan driving, and timing control.

In addition, in some embodiments, the display panel 110 further has a touch sensing function, and the display driving chip 120 is a touch with display driver integration (TDDI) chip, which provides display driving signals to the display panel 110 and touch sensing signals.

The wireless communication module 130 is used for transmitting and/or receiving wireless signals, and can perform wireless communication connection and/or transmission with other entities. The wireless communication module 130 can be a cellular (cellular) mobile communication module, a wireless local area network (WLAN) module, a bluetooth (bluetooth) module, a near field communication (NFC) module Group, Global Navigation Satellite System (GNSS) module, the above combination and/or other modules with wireless communication function. According to the above types, the wireless communication module 130 can be used in various wireless communication systems, such as cellular networks, wireless local area networks, Bluetooth networks, Internet of Things (IoT), satellite communication systems, combinations of the above and/or Other wireless communication systems, wherein the cellular network can be Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (Wideband) Code Division Multiple Access; WCDMA), Long Term Evolution (Long Term Evolution; LTE), Advanced Long Term Evolution (Advanced Long Term Evolution; LTE-A), combinations of the above and/or other cellular networks.

The application processor 140 is used to control the operation of each functional module (eg, the display panel 110 , the display driver chip 120 , the wireless communication module 130 and/or other functional modules) in the electronic device 100 through different transmission interfaces. For example, the application processor 140 provides the image data signal and transmits it to the display driving circuit 120 through a transmission interface. The application processor 140 can be Integrated circuits, system chips, microprocessors, or other similar components are implemented, and may be provided on a motherboard (not shown). In some embodiments, the signal transmission between the application processor 140 and the display driver chip 120 conforms to the Display Serial Interface (DSI) specification established by the Mobile Industry Processor Interface (MIPI) alliance. And the signal transmission between the application processor 140 and the wireless communication module 120 conforms to the Virtual GPIO Interface (VGI) specification and the Low Latency Interface (LLI) developed by the Mobile Industry Processor Interface Alliance. specifications and/or I3C (Improved Inter-Integrated Circuit) specifications, etc.

FIG. 2 is a partial structural side view of the electronic device 100 according to some examples. As shown in FIG. 2 , the display driver chip 120 is disposed on the display side of the display panel 110 and is coupled to the connecting member 150 , and the connecting member 150 extends outward from one side of the display panel 110 and is bent to the back of the display panel 110 . The display driving chip 120 is disposed outside the display area of the display panel 110 to avoid blocking the image display of the display panel 110 . The connecting component 150 may be a flexible printed circuit (FPC), a flexible flat cable (FFC) or other flexible components with a signal transmission function, which includes a flexible substrate 152, signal traces 154 and Ground traces 156 , wherein the signal traces 154 and the ground traces 156 are respectively located on opposite sides of the flexible substrate 152 on the back side of the display panel 110 . The signal traces 154 and the ground traces 156 are on the same side of the flexible substrate 152 at the bend of the connecting member 150 and the display side. In other embodiments, the signal traces 154 and the ground traces 156 are respectively located on the backside of the display panel 110 on the flexible substrate 152 . same side. In other examples, the driving display chip 120 may be directly disposed on the connecting member 150 and electrically connected to the display panel 110 via the connecting member 150 .

FIG. 3 is a partial plan view of the structure of the connecting member 150 . The connecting component 150 is divided into first to third sections 150A- 150C, wherein the first section 150A is coupled to the motherboard (not shown) including the application processor 140 to receive image data signals from the application processor 140 , The second section 150B is the bend of the connecting member 150 , and the third section 150C is joined to the display panel 110 . When the connecting member 150 is bent, the first to third sections 150A to 150C are respectively located on the back side, the side side and the display side of the display panel 110 . The third section 150C of the connection part 150 may be bonded to the display panel 110 through packaging techniques such as chip on film (COF) or tape carrier package (TCP). As shown in FIG. 3 , the driving display chip 120 is disposed on the third section 150C of the connecting member 150 , and is coupled to the display panel 110 via the connecting member 150 . In other embodiments, the driving display chip 120 is directly bonded to the display panel 110 through packaging such as chip on glass (COG), and is coupled to the third section 150C of the connection member 150 .

The signal traces 154 may have different widths in the first to third sections 150A- 150C of the connecting part 150 , and as such, the signal traces 154 are in the first to third sections 150A- 150C of the connecting part 150 . The value of impedance per unit length in will also change accordingly. The first portion of the signal trace 154 is in the first section 150A of the connection member 150 and the second portion of the signal trace 154 is in the second and third sections 150B, 150C of the connection member 150 . in this In the embodiment of the invention, the second portion of the signal trace 154 has a larger impedance value per unit length than the first portion. For example, FIG. 4A is an example of an enlarged plan view of a partial area of the connecting member 150 of FIG. 3 . As shown in FIG. 4A , the signal traces 154 are located in the middle of the flexible substrate 152 , and the ground traces 156 are located on the left and right sides of the flexible substrate 152 , respectively. In the first section 150A of the connecting member 150 , the width of the first portion of the signal trace 154 is W1 , and in the second section 150B of the connecting member 150 , the width of the second portion of the signal trace 154 gradually increases from W1 Scale down to W2. FIG. 4B is another example of an enlarged plan view of a partial region of the connecting member 150 of FIG. 3 . The difference between FIG. 4B and FIG. 4A is that in the second section 150B of the connecting member 150 , the width of the second portion of the signal trace 154 is W2 . According to the example of FIGS. 4A and 4B , the impedance value per unit length of the signal trace 154 in the second section 150B of the connecting member 150 is greater than the impedance value per unit length in the first section 150A of the connecting member 150 . Examples of Figures 4A and 4B. Other examples derived from the content of FIG. 4A or FIG. 4B can also achieve the impedance value relationship per unit length of the first and second portions of the signal trace 154 in the first and second sections 150A, 150B of the connecting member 150 .

5 is a graph showing the impedance distribution of the connecting components according to the embodiment of the present invention and the comparative example, wherein the width of the second part of the signal trace of the connecting component according to the embodiment of the present invention is smaller than the width of the first part (as shown in FIG. 4B ), and the comparison The first portion and the second portion of the signal traces of the connecting components have the same width. In the impedance distribution graph of FIG. 5 , the first to third sections correspond to the first to third sections 150A˜ 150C of the connecting member 150 in FIG. 3 , respectively. As shown in FIG. 5 , in the second section, the impedance of the connecting member of the embodiment of the present invention is greater than that of the connecting member of the comparative example. In addition, the electric field strength generated by the connecting member of the comparative example is about 6.88×10 ^-3 volts/meter (v/m), while the electric field strength generated by the connecting member of the present invention is about 3.00×10 ^-3 volts /meter (V/m), which is less than half of the electric field intensity generated by the connection member of the comparative example. Compared with the connecting member of the comparative example, the electric field intensity generated by the connecting member of the embodiment of the present invention is reduced by more than 3 dB, thus effectively reducing the interference to wireless communication.

As can be seen from the above, the electronic device of the present invention can effectively reduce the electric field intensity generated when the image data signal is transmitted to the display panel, thereby reducing the interference to wireless communication, thereby ensuring the quality of wireless communication.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be determined by the scope of the appended patent application.

100‧‧‧Electronic Devices

110‧‧‧Display panel

120‧‧‧Driver Display Chip

130‧‧‧Wireless Communication Module

140‧‧‧Application Processors

Claims (10)

An electronic device comprising: a display panel; a display driver chip coupled to the display panel; and a connecting component including a signal trace, the signal trace has a first part and a second part, wherein the signal The first part of the trace is used for receiving the image data signal, and the second part of the signal trace is located at the bend of the connecting part and is coupled to the display driver chip, and the second part of the signal trace has an impedance per unit length The value is greater than the impedance value per unit length of the first portion of the signal trace. The electronic device of claim 1, wherein the width of the second portion of the signal trace is smaller than the width of the first portion of the signal trace. The electronic device of claim 1, wherein the display driver chip is a touch with display driver integration (TDDI) chip. The electronic device as described in claim 1, wherein the display driving chip is directly disposed on the display panel. The electronic device as described in claim 1, wherein the connecting member is a flexible printed circuit board (flexible printed circuit board) circuit; FPC) or a flexible flat cable (flexible flat cable; FFC). The electronic device as described in claim 5, wherein the connecting member further comprises a flexible substrate, and in the connecting member, the first portion of the signal trace and the ground trace are located at two opposite sides of the flexible substrate. side, and the second portion of the signal trace and a ground trace are located on the same side of the flexible substrate. The electronic device as described in item 1 of the claimed scope further comprises: an application processor coupled to the first part of the connection component, and the application processor is used for providing the image data signal. The electronic device as described in claim 7, wherein the signal transmission between the application processor and the display driver chip conforms to the Serial Display Interface (Display Serial Interface) ( Display Serial Interface; DSI) specification. The electronic device as described in item 1 of the claimed scope further comprises: a wireless communication module for transmitting or receiving wireless signals. The electronic device according to claim 9, wherein the wireless communication module is a cellular (cellular) mobile communication module, a wireless local area network (WLAN) module, a Bluetooth ( bluetooth) module, a near field communication (near field communication; NFC) module or a global navigation satellite system (global navigation satellite system; GNSS) module.

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