KR20070070760A - Mobile communication terminal and method for setting transfer rate according to amount of data - Google Patents

Abstract

A mobile terminal for setting a transmission rate according to an amount of data and its method are provided to be less sensitive to noise generated from the outside by setting a serializer and a deserializer at a low speed, and improve temperature characteristics. A serializer(110) converts parallel data to serial data in synchronization with an inputted clock and transmits it through a transmission line. A deserializer(120) converts the serial data which has been transmitted through the transmission line into parallel data. A display unit(140) converts the converted parallel data into visual data and outputs it. A controller(100) sets a clock frequency by an amount of data transmitted to the serializer. A clock varying unit(130) generates clock according to the set clock frequency and supplies it to the serializer and the deserializer.

Description

Mobile communication terminal and method for setting transfer rate according to amount of data

1 is a block diagram schematically illustrating a configuration of a mobile communication terminal for setting a transmission rate according to an amount of data according to an embodiment of the present invention;

2 is a flowchart schematically illustrating a method of setting a transmission rate according to an amount of data according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: control unit 110: serializer

120: deserializer 130: clock variable part

140: display

The present invention relates to a mobile communication terminal, and more particularly, to a transmission rate of data to be displayed. In the microprocessor of the mobile communication terminal and in the display device, data transfer therein is performed through a data bus. In this process, the data bus communicates in parallel. However, in the data transmission from the microprocessor to the display device, since the transmission distance is relatively far, serial communication is advantageous in the data communication therebetween. Thus, a serializer (serializer) and a deserializer (serializer) are located between the microprocessor and the driver IC of the display device. The serializer converts the parallel data on the data bus into serial data and sends the converted signal to the deserializer. The deserializer restores the converted data back to the parallel data and transmits the converted data to the driver IC input of the display device.

In general, when a serializer and a deserializer are used to transmit data, data is transmitted according to a fixed transmission clock. At this time, the clock frequency is usually set according to high speed data transmission. However, the display device of the mobile phone does not always require high-speed data transmission. For example, during a voice call, there is not much data to display. Therefore, in this case, since it is unnecessarily set at a high speed, it is more sensitive to external noise than when it is set at a low speed, and has a disadvantage in that temperature characteristics are lower.

The present invention is derived from such a background, and an object thereof is that the transmission speed can be varied according to the amount of data.

A mobile communication terminal for setting a transmission rate according to an amount of data according to an aspect of the present invention for achieving the above object is characterized by setting a clock frequency in the serializer and the deserializer according to the amount of data.

According to the present invention according to this aspect of the present invention, when there is not a large amount of data such as a voice call, it is not necessary to apply an unnecessary load by setting the transmission clock frequency that is set unnecessarily to a low speed. In addition, since the serializer and the deserializer are set at a low speed, the serializer and the deserializer are less sensitive to external noise and have excellent temperature characteristics.

The foregoing and additional aspects of the present invention are described in detail below to enable those skilled in the art to readily understand and reproduce the present invention with reference to the embodiments described with reference to the accompanying drawings.

1 is a block diagram schematically illustrating a configuration of a mobile communication terminal for setting a transmission rate according to an amount of data according to an embodiment of the present invention. As shown, a mobile communication terminal for setting a transmission rate according to the amount of data according to the present invention includes a serializer 110 for converting parallel data into serial data and synchronizing with an input clock and transmitting the same through a transmission line, and a transmission line. Deserializer 110 for converting the serial data transmitted through the parallel data to the parallel data, the display unit 140 for converting the data converted in the deserializer 120 to the visual data and outputted to the serializer 110 The controller 100 sets a clock frequency according to the amount of data, and a clock generator 130 generating a clock according to the set clock frequency and supplying the clock to the serializer 110 and the deserializer 130.

The serializer 110 includes a shift register and a 1-bit delay element. The serializer 110 may be built in a chip for an MSM (Mobile Station Modem) modem manufactured by Qualcomm for performing various functions of a mobile phone device. In the present embodiment, the serializer 110 converts the parallel data received from the data bus of the microprocessor into serial data.

The deserializer 130 receives serial data converted by the serializer 110 through a transmission line, and converts the data into parallel data again. The deserializer 120 applies the clock supplied from the clock generator 130 to restore the received data into parallel data and transmits the received data to the display 140.

The controller 100 includes a digital signal processor (DSP), a microprocessor, and other circuits, and is a typical configuration for controlling the overall operation of the mobile communication terminal. In the present embodiment, the control unit 100 senses the amount of data transmitted to the serializer 110, and sets the clock frequency variable according to the amount. In the present embodiment, the data transmitted to the serializer 100 may be content stored in the memory of the terminal. In another embodiment, the data may be an image captured from a camera mounted on the terminal. It may also be data transmitted from the communication unit.

The clock generator 130 may be a multiplication circuit including an L and C tuning circuit as a transmission clock conversion circuit. In the present embodiment, the reference clock frequency may be multiplied by two through a multiplication circuit to supply the serializer and the deserializer. In addition, in the present embodiment, when the amount of data is further increased, the clock frequency can be multiplied by four and supplied. Since the technology for the multiplication circuit is already known, a detailed description thereof will be omitted. In another embodiment, the clock generator 130 may be configured to include a plurality of latch elements and a comparison / selection output circuit, and the present invention is construed to cover such obvious modifications.

The display unit 140 includes an LCD driver, an LCD controller, and a display unit. Preferably, the control unit 100 receives a driving control signal including a reset control signal. The display unit displays screen display information input from the display driver and is preferably implemented by an LCD (Liquid Cristal Display). The display unit converts and displays various display data and text data generated in the mobile communication terminal into visual data. In the present embodiment, the display 140 may display a call state during a call. In addition, it outputs the image taken from the camera and displays it for the user to watch.

According to a characteristic aspect of the present invention, the clock generator 130 includes a phase locked loop (PLL) circuit, and the controller controls the division ratio of the phase locked loop (PLL) circuit. The output frequency can be varied by controlling the division ratio of the divider included in the phase locked loop (PLL) circuit in software.

The controller 100 causes the reference clock frequency to be supplied to the serializer 110 and the deserializer 120 when the amount of data is less than the predetermined amount. However, when the predetermined amount or more, the division ratio is controlled to multiply the output frequency of the clock generator 130. A clock is generated according to the multiplied output frequency and set to be supplied to the serializer 110 and the deserializer 120. In the present embodiment, the reference clock frequency may be 19.2 MHz used in a typical mobile communication terminal. In the present embodiment, the control unit 100 applies a reference clock frequency when the display unit 140 displays a call state. For example, when displaying an image photographed by a camera or a moving image stored in a memory, it is preferable to control the clock generator 130 to apply a clock frequency multiplied by 2 or 4 times. In this case, the clock can be generated by applying a clock frequency of 38.4 MHz, which is twice the 19.2 MHz.

Accordingly, when displaying video data on the screen, the data amount of the parallel data bus increases, and at this time, the transmission speed is increased to prevent distortion of the signal.

Hereinafter, a method of setting a transmission rate according to the amount of data according to the present invention will be described. 2 is a flowchart schematically illustrating a method of setting a transmission rate according to an amount of data according to an embodiment of the present invention.

In this embodiment, the steps of setting a clock frequency in accordance with the amount of data to be transmitted, generating a clock in accordance with the set clock frequency, generating a clock in accordance with the multiplied clock frequency, parallel data Converting the serial data into a synchronized clock and transmitting the converted serial data; converting the transmitted serial data into parallel data; and reproducing and displaying the converted parallel data.

First, the controller determines whether there is data transmitted to the serializer 110 (step S210). As described above, the controller 100 determines the amount of data to be output to the display 140. In one embodiment, it may be data indicating a call state during a call, or may be video taken by a camera mounted on a mobile communication terminal or video data received through a communication unit. Then, it is determined whether the amount of data is more or less based on the predetermined amount (step S220). In the present embodiment, the predetermined amount is preferably such that the data for notifying the call state can be distinguished from the video data.

Subsequently, the controller 100 determines that the amount of the supplied data is equal to or greater than a predetermined amount, that is, when the supplied data is determined as the image captured by the camera or the video data received through the communication unit, the clock generator 130 clocks. Control to increase the frequency (step S230). Then, the clock generator 130 reduces the distribution ratio of the dividers included in the PLL circuit, thereby multiplying the reference clock frequency by 2 or 4 times. However, if the data amount is less than the predetermined amount, i.e., if the supplied data is simply data indicating the call state, the reference clock frequency is applied (step S235). The clock generator 130 generates a clock corresponding to the frequency and supplies the clock to the serializer 110 and the deserializer 120 (step S240).

The serializer then converts the parallel data transmitted through the data bus of the controller 100 into serial data (step S250) and transmits the data through the transmission line in synchronization with the supplied clock. The deserializer 120 then receives this serial data and restores it back to parallel data. The data is converted back into parallel data and transmitted to the display unit 140 (step S260). Then, the display unit 140 receives the parallel data, converts it into visual data, and outputs the converted data (step S270).

As described above in detail, according to the present invention, when there is not much data such as a voice call, the transmission clock frequency is set to a low speed so that unnecessary load is not applied. In addition, as the serializer and deserializer are set at low speeds, they can be less sensitive to external noise and provide better temperature characteristics. In addition, when displaying video data on the screen, the amount of data in the parallel data bus increases, and at this time, the transmission speed is increased to prevent distortion of the signal.

On the other hand, the present invention has been described with reference to the embodiments shown in the drawings but this is only exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (3)

A serializer converting parallel data into serial data and synchronizing with an input clock to transmit the parallel data through a transmission line; A deserializer for converting serial data transmitted through the transmission line into parallel data; A display unit converting the data converted by the deserializer into visual data and outputting the visual data; A controller for setting a clock frequency in accordance with the amount of data transmitted to the serializer; And a clock generator for generating a clock according to the set clock frequency and supplying the clock to the serializer and the deserializer. The method of claim 1, The clock generator includes a phase locked loop (PLL) circuit, And the controller controls the division ratio of the phase locked loop circuit. Setting a clock frequency in accordance with the amount of data to transmit; Generating a clock according to the set clock frequency; Converting the parallel data into serial data and synchronizing with the generated clock to transmit the parallel data; Converting the transmitted serial data into parallel data; Playing and displaying the converted parallel data; and setting the transmission rate according to the amount of data.

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