TW202046658A - 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 in particular to an electronic device that can reduce the interference of image data signal transmission to wireless communication.

For electronic devices with a display panel, the display driving circuit usually receives image data signals through a printed circuit board, processes the image data signals and outputs them to the display panel, so that the display panel displays images accordingly. In addition, many electronic devices, especially mobile electronic devices, have screen display and wireless communication functions at the same time, such as cellular mobile communication, wireless local area network (WLAN) communication, and Bluetooth (bluetooth) communication. , Near field communication (NFC), global navigation satellite system (GNSS) positioning, etc. In some common electronic devices, the application processor transmits image data signals to the display driving circuit through a flexible printed circuit board. However, the electric field generated by the flexible printed circuit board during signal transmission may cause interference to wireless communication, resulting in a desense of wireless communication.

The purpose of the present invention is to provide an electronic device which can effectively reduce the interference to wireless communication during image data signal transmission 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 connecting components. The display driver chip is coupled to the display panel. The connecting component has a first part and a second part. The first part is used for receiving the image data signal, and the second part is coupled to the display driver chip. The impedance per unit length of the signal trace in the second part is greater than the impedance per unit length of the signal trace in the first part.

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

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 driver chip is directly disposed on the display panel.

According to one or more embodiments of the present invention, the above-mentioned connecting component 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 connecting component, the signal trace and the ground trace of the connecting component are located on opposite sides of the flexible substrate, and in the second part of the connecting component, the signal trace and the ground trace of the connecting component The thread is on the same side of the flexible substrate.

According to one or more embodiments of the present invention, the above-mentioned electronic device further includes an application processor, which is coupled to the second part of the above-mentioned connecting member and used for providing the above-mentioned 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 aforementioned 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 above-mentioned wireless communication module is a cellular mobile communication module, a wireless local area network (WLAN) module, a bluetooth module, a proximity Near field communication (NFC) module or global navigation satellite system (GNSS) module.

100‧‧‧Electronic device

110‧‧‧Display Panel

120‧‧‧Drive the display chip

130‧‧‧Wireless communication module

140‧‧‧Application Processor

150‧‧‧Connecting parts

150A‧‧‧First section

150B‧‧‧Second section

150C‧‧‧Section 3

152‧‧‧Flexible substrate

154‧‧‧Signal trace

156‧‧‧Ground trace

W1, W2‧‧‧Width

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

The following will clearly illustrate the spirit of the present disclosure with figures and detailed descriptions. Anyone with ordinary knowledge in the technical field who understands the preferred embodiments of the present disclosure can make changes and changes based on the techniques taught in the present disclosure. Modifications do not depart from the spirit and scope of this disclosure.

The terms used in this text are only for describing specific embodiments and not for limiting the scope of patent applications. Unless otherwise restricted, the term "one" or "the" in the singular form can also be used to indicate the plural form. In addition, the use of the terms of spatial relativity is to describe the different orientations of the elements in use or operation, and is not limited to the directions shown in the drawings. Elements can also be oriented in other ways (rotated by 90 degrees or in other directions), and the spatial relativity description used here can also be interpreted in the same way.

In order to simplify and clarify the description, component symbols and/or letters may be repeatedly used in various embodiments herein, but this does not mean that there is a causal relationship between the various embodiments and/or configurations discussed.

In addition, spatial relative terms may be used in this article, such as "over", "on", "under", "below", etc., to facilitate the description of the diagram. Shows a component Or the relationship between a feature and another element or feature. In addition to the directions shown in the drawings, these spatial relative terms are intended to include different orientations of the elements in use or operation.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of an electronic device 100 according to an embodiment of the present invention. The electronic device 100 is a device with a display screen and wireless communication functions, such as a tablet computer, a smart phone, etc., but is 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 to display images, and it can be any type of liquid crystal display panel, an inorganic or organic light emitting diode display panel, or other suitable display panels.

The display driver chip 120 is coupled to the display panel 110, and is used for processing the image data signal and outputting the pixel signal to the display panel 110, so that the display panel 110 displays a picture accordingly. The display driver chip 120 includes a data driver circuit for sequentially outputting pixel signals to each pixel row or pixel column of the display panel 110 for the image data signal. In some embodiments, the display driver chip 120 further includes a scan driver circuit, a timing control circuit, etc., 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 driver chip 120 is a touch with display driver integration (TDDI) chip, which provides display driving signals to the display panel 110 And touch sensing signal.

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 may be a cellular mobile communication module, a wireless local area network (WLAN) module, a 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, among which the cellular network can be the Global System for Mobile Communications (GSM), Code Division Multiple Access (CDMA), and Wideband Multiple Access System (Wideband). Code Division Multiple Access; WCDMA), Long Term Evolution (LTE), Advanced Long Term Evolution (LTE-A), the above combination and/or other cellular networks.

The application processor 140 is used to control the operation of various functional modules (such as the display panel 110, the display driver chip 120, the wireless communication module 130 and/or other functional modules) of the electronic device 100 through different transmission interfaces. For example, the application processor 140 provides an image data signal and transmits it to the display driving circuit 120 through a transmission interface. The application processor 140 can be The integrated circuit, system chip, microprocessor or other similar components can be implemented, and can be set on a motherboard (not shown in the figure). 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 formulated 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 Low Latency Interface (LLI) specified by the Mobile Industry Processor Interface Alliance Specifications and/or I3C (Improved Inter-Integrated Circuit) specifications, etc.

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

FIG. 3 is a schematic diagram of a partial plan structure of the connecting member 150. The connecting component 150 is divided into first to third sections 150A~150C, where the first section 150A is coupled to a motherboard (not shown in the figure) containing the application processor 140 to receive image data signals from the application processor 140, The second section 150B is the bending part of the connecting member 150, and the third section 150C is joined with 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, side and display side of the display panel 110. The third section 150C of the connecting member 150 can be joined to the display panel 110 through packaging technologies 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 connected to the display panel 110 through a chip on glass (COG) packaging method, and is coupled to the third section 150C of the connecting component 150.

The signal trace 154 may have different widths in the first to third sections 150A to 150C of the connecting member 150, and in this way, the signal trace 154 is in the first to third sections 150A to 150C of the connecting member 150 The impedance per unit length in will also change accordingly. The first part of the signal trace 154 is in the first section 150A of the connecting member 150, and the second part of the signal trace 154 is in the second and third sections 150B, 150C of the connecting member 150. In this In the embodiment of the invention, the first part of the signal trace 154 has a larger impedance per unit length than the second part. For example, FIG. 4A is an example of an enlarged plan view of a partial area of the connecting member 150 in FIG. 3. As shown in FIG. 4A, the signal trace 154 is located in the middle of the flexible substrate 152, and the ground trace 156 is 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 changes from W1. Shrink to W2. FIG. 4B is another example of an enlarged plan view of a partial area of the connecting member 150 in 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 examples of FIGS. 4A and 4B, the impedance value per unit length of the signal trace 154 in the first section 150A of the connecting member 150 is larger than the impedance value per unit length in the second section 150B 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 unit length impedance relationship 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 component of 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 of the embodiment of the present invention is smaller than the width of the first part (as shown in FIG. 4B), and the comparison For example, the first part and the second part of the signal trace of the connecting part have the same width. In the impedance distribution curve of FIG. 5, the first to third sections correspond to the first to third sections 150A to 150C of the connecting member 150 of 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 the impedance of the connecting member of the comparative example. In addition, the electric field intensity generated by the connecting component of the comparative example is about 6.88×10 ^-3 volts/meter (v/m), while the electric field intensity generated by the connecting component of the embodiment 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 connecting member of the comparative example. Compared with the connecting part of the comparative example, the electric field intensity generated by the connecting part of the embodiment of the present invention is reduced by more than 3dB, so the interference to wireless communication is effectively reduced.

It can be seen from the above that the electronic device of the present invention can effectively reduce the intensity of the electric field generated when the image data signal is transmitted to its display panel, thereby reducing the interference to wireless communication and 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 familiar with 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 subject to those defined in the attached patent scope.

100‧‧‧Electronic device

110‧‧‧Display Panel

120‧‧‧Drive the display chip

130‧‧‧Wireless communication module

140‧‧‧Application Processor

Claims (10)

An electronic device includes: a display panel; a display driver chip coupled to the display panel; and a connecting component including a signal trace, the signal trace having a first part and a second part, wherein the signal The first part of the trace is used to receive the image data signal, and the second part of the signal trace is coupled to the display driver chip, and the second part of the signal trace has a higher impedance per unit length than the first part of the signal trace The impedance value per unit length. In the electronic device described in claim 1, wherein the width of the second part of the signal trace is smaller than the width of the first part of the signal trace. The electronic device described in claim 1, wherein the display driver chip is a touch with display driver integration (TDDI) chip. According to the electronic device described in item 1 of the scope of patent application, the display driver chip is directly arranged on the display panel. According to the electronic device described in item 1 of the scope of patent application, the connecting component is a flexible printed circuit (FPC) or a flexible flat cable (FFC). The electronic device described in claim 5, wherein the connecting component further comprises a flexible substrate, and in the connecting component, the first part of the signal trace and the ground trace are located on opposite sides of the flexible substrate The second part of the signal trace and a ground trace are located on the same side of the flexible substrate. For example, the electronic device described in claim 1 further includes an application processor (application processor) coupled to the second part of the connecting component, and the application processor is used to provide the image data signal. For the electronic device described in item 7 of the scope of patent application, the signal transmission between the application processor and the display driver chip conforms to the display serial interface (MIPI) specified by the Mobile Industry Processor Interface (MIPI) Alliance Display Serial Interface; DSI) specifications. The electronic device described in item 1 of the scope of patent application further includes: a wireless communication module for transmitting or receiving wireless signals. The electronic device described in claim 9, wherein the wireless communication module is a cellular mobile communication module Group, a wireless local area network (WLAN) module, a bluetooth module, a near field communication (NFC) module or a global navigation satellite system ; GNSS) module.

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