KR20080000244A - Apparatus for communication between main board and sub board - Google Patents

Abstract

A communication apparatus between a main board and a sub board is provided to extend the life span of a mobile phone by executing communication between a main board and a sub board using optical or infrared data, without an FPCB(Flexible Printed Circuit Board) for communication with an external display element. A communication apparatus comprises a main board(200), a light guide unit(207), and a sub board(220). The main board(200) comprises the first converter(201) and an electric-to-optical conversion part(203). The first converter(201) converts data, inputted through one or more data bus lines, into one data. The electric-to-optical conversion part(203) converts electrical digital data, inputted from the first converter(201), into optical or infrared data and outputs the converted optical or infrared data. The light guide unit(207) delivers optical data, inputted from the main board(200), to the sub board(220). The sub board(220) converts optical or infrared data, inputted from the light guide unit(207), into electrical data.

Description

Communication device between main board and sub board {APPARATUS FOR COMMUNICATION BETWEEN MAIN BOARD AND SUB BOARD}

1 is a view showing a connection structure between the board according to the prior art, and

2 is a diagram illustrating a configuration of a communication device between a main board and a sub board according to the present invention.

The present invention relates to a communication device between a main board and a sub board, and more particularly, to a communication device between a main printed circuit board (PCB) and a display module using an optical or infrared communication method.

With the development of the telecommunications industry, mobile terminals for providing wireless communication services have become a necessity for most people. In addition, the launch of various types of mobile communication terminals to suit the user's tastes induces competition among producers, which has led to rapid advances in wireless communication. In this context, small mobile communication terminals have recently been introduced, and representatively, folding and slide mobile communication terminals have been in the spotlight of consumers.

The mobile communication terminal is composed of a main body portion and a folder portion (or slide portion) connected to the main body portion by a hinge device, and a main printed circuit board (hereinafter referred to as 'PCB') provided in the main body portion. ) Is connected by a display module of the folder unit (or slide unit) displaying the data input from the main body unit and a flexible printed circuit board (FPCB).

1 is a view showing a board-to-board connection structure according to the prior art.

Referring to FIG. 1, the main PCB 101 is mainly equipped with components that are responsible for important functions of the terminal such as a mobile station modem (MSM), a keypad, an antenna, a wireless transceiver, a memory, and a display module 103. ) Is equipped with one or two LCD screens, speakers, and cameras. In addition, the FPCB 105 has three or four layers and has about 30 to 40 data lines. The FPCB 105 transmits various types of data generated by the main PCB 101 to the display module 103 at a high speed. It serves to send.

However, as the functions of the mobile communication terminal are diversified, data lines and layers including the FPCBs connecting between the main PCB and the display module are increasing, which occupies the inner layer space. It is a design constraint. In addition, since there are too many data lines, the round formed around the data lines is weakened, and thus, electrostatic discharge (ESD) is also weakened. Recently, in order to solve such a problem, a technology of significantly reducing the number of data lines has been commercialized, but FPCB, which physically connects the main PCB and the display module, still serves as a limiting factor of the life of a mobile phone.

In addition, when an RF (Radio Frequency) radiator such as an antenna is located in an adjacent space, the high-speed data lines act as noises that reduce air sensitivity to each other, and expensive electromagnetic shielding to prevent the noise. (ElectroMagnetic Interference: EMI) When using a component that acts as a filter, there is a problem that causes a unit cost increase. This will be a factor that adversely affects performance in the development of mobile phones.

Finally, as the demands of users and the improvement of digital multimedia technology tend to increase the data rate, the frequency spectrum of digital pulse noise is changing to wide bandwidth. In the future, high-speed video display driving, a transmission medium such as FPCB has a problem in that it causes a bad effect on the mobile phone call performance due to loss and spurious radiation.

Accordingly, an object of the present invention is to provide a communication device between a main board and a sub board.

Another object of the present invention is to provide an apparatus for performing communication between a main board and a sub board using optical or infrared data.

According to an exemplary embodiment of the present invention, a communication device between a main board and a sub board includes: the main board converting electrical data into optical or infrared data and outputting the converted optical or infrared data; And a light guide device for transferring optical data input from the main board to the sub board, and the sub board for converting light or infrared data input from the light guide device into electrical data.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention will be described a communication device between the main board and the sub-board. Here, the main board and the sub-board may be, for example, a main PCB and a display module of the mobile communication terminal, and in the case of a wireless communication device, may be included in the present invention.

2 is a diagram illustrating a configuration of a communication device between a main board and a sub board according to the present invention. The communication device includes a main board 200 and a sub board 220, and a light guide device 207 connecting the main board 200 and the sub board 220. Here, the main board 200 includes a first converter 201, an electric / optical converter 203, and a control driver 205, and the sub board 220 includes a focusing unit 209 and an optical beam. And an electrical converter 211 and a second converter 213.

Referring to FIG. 2, the main board 200 includes, for example, main components such as a mobile station modem (MSM), a keypad, an antenna, a wireless transceiver, a memory, and other components that are responsible for important functions of the terminal. The main board 200 transmits a control signal or a data signal output from the main controller to the LCD screen of the sub board 220 through the light guide device 207.

Here, the first converter 201 converts one or more bus lines located on the main board 200 and connected to an external display and sensor, that is, the sub board 220 into one line, thereby converting several data bus lines. The data input through the data is converted into one data, and the converted data serves to output to the electrical / light conversion unit 203. In this case, the first converter 201 may be implemented as a digital multiplexer.

The electrical / light conversion unit 203 converts one piece of electrical digital data input from the first converter 201 into light (or infrared) data under the control of the control driver 205, and converts the converted light. (Or infrared) data is output to the focusing unit 209 of the sub-board 220 through the light guide device 207. The electrical / light conversion unit 203 may be implemented by, for example, a laser or an infrared source.

The control driver 205 controls the on / off of the electric / light conversion unit 203 to indicate '0' and '1' with or without light or infrared light.

The light guide device 207 transfers optical data input from the electric / light conversion unit 203 to an external display and a sensor, that is, the sub board 200. Here, the light guide device 207 may be implemented by, for example, an optical fiber or an optical waveguide.

For example, one or more liquid crystal screens, speakers, cameras, and the like are mounted on the sub-board 220, and control signals or data signals input from the main board 200 through the light guiding device 207 are internal liquid crystals. It plays a role of delivering to the screen.

Here, the focusing unit 209 serves to focus the light input through the light guiding device 207 to the optical / electrical conversion unit 211 as much as possible, for example, a lens. The photo coupler may be implemented.

The optical / electric converter 211 converts optical (or infrared) data received through the focusing unit 209 into electrical data and outputs the electrical data to the second converter 213. Photo detector, infrared sensor, or the like.

The second converter 213 distributes electrical data input from the optical / electric converter 211 to each data line of a liquid crystal display (LCD) module again. The second converter 213 may be implemented as a digital de-multiplexer.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention performs communication between the main board and the sub-board by using optical or infrared data, so that a flexible printed circuit board (FPCB) is used for communication with an external display device. Because it doesn't use, it can extend the life of mobile phone and it can improve RF (Radio Frequency) radiation and sensitivity because it uses optical system which does not generate noise at all. In addition, by effectively eliminating digital radiation noise sources in the mobile phone development stage in a short time, the development period can be considerably shortened, and it is suitable for high speed data display because it uses a light source of almost infinite bandwidth. Has the advantage of reducing the gain and spurious noise radiation caused by the FPCB. In addition, a liquid crystal display (hereinafter referred to as "LCD") data line is required when the artwork is performed using a 6/8 layer printed circuit board (hereinafter referred to as "PCB"). This eliminates the constraints on the PCB board caused by the passing of data lines, which is advantageous for securing design flexibility and securing performance on board, and significantly reducing the cost of mobile phones by significantly reducing the number of countermeasure parts to reduce digital LCD noise. It is effective. Finally, if there is no sensor such as a camera on the folder or slide side, only the power line goes up on the external display device, so ESD (Electro Static) such as memory or mobile station modem (MSM) located on the PCB board is removed. It is easy to isolate from the discharge, which is advantageous for the development of ESD-insensitive mobile phones.

Claims (12)

In the communication device between the main board and the sub board, The main board converting electrical data into optical or infrared data and outputting the converted optical or infrared data; A light guiding device transferring optical data input from the main board to the sub board; And the sub-board converting light or infrared data input from the light guiding device into electrical data. The method of claim 1, The main board, A first converter for converting data input through one or more data bus lines into one data; And an electrical / light conversion unit converting the electrical digital data input from the first converter into optical or infrared data and outputting the converted optical or infrared data. The method of claim 2, And wherein the first converter is implemented as a digital multiplexer. The method of claim 2, And a control driver for controlling on / off of the electric / light conversion unit. The method of claim 2, And the electrical / light conversion unit is implemented by at least one of a laser and an infrared source. The method of claim 1, The light guide device may be implemented by at least one of an optical fiber and an optical waveguide. The method of claim 1, The sub board, An optical / electric converter for converting input optical or infrared data into electrical data; And a second converter for distributing electrical data input from the optical / electric converter to each data line of the corresponding module. The method of claim 7, wherein And a focusing unit for focusing the input optical or infrared data so as to concentrate the optical / electric converter as much as possible and outputting the optical / electric converter to the optical / electric converter. The method of claim 8, The focusing unit may be implemented using at least one of a lens and a photo coupler. The method of claim 7, wherein And the optical / electric converter is implemented by at least one of a photo detector and an infrared sensor. The method of claim 7, wherein And the second converter is implemented by a digital de-multiplexer. The method of claim 7, wherein And said corresponding module is a liquid crystal display (LCD) module.

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