KR20080043603A - Image displaying device and method of displaying the image - Google Patents

Abstract

An image displaying device and an image displaying method are provided to set and store variously the available clock frequency range of EDID for storing display information, and change the available clock frequency range of the EDID when image quality is deteriorated due to interference between the display clock frequency and DMB frequency of a DMB receive, and display a screen based on the changed clock frequency range of the EDID, thereby enabling a user to use DMB anywhere regardless of a location. A DMB(Digital Multimedia Broadcasting) receiver receives a DMB signal to output video, audio, and data signals. A display unit(210) displays video data received through the DMB receiver on a screen. Data associated with the display unit is stored in EDID(Extended Display Identification Data), and the available clock frequency range of the display unit is variously set and stored in the EDID. A controller(230) controls the available clock frequency range of the EDID according to the request of a user and displays the screen based on the controlled available clock frequency range of the EDID.

Description

Image display device and method of displaying the image}

1 is a perspective view for explaining the external structure of a DMB laptop computer according to the present invention.

2 is an internal configuration diagram of a notebook computer including a DMB broadcast receiving device and a display according to the present invention.

3 is a flowchart illustrating a digital multimedia broadcasting reception method using a notebook computer according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device and an image display method, and more particularly, to an image display device capable of viewing digital multimedia broadcasting (DMB) in an improved image quality by changing a clock frequency of a display. It relates to an image display method.

In general, digital broadcasting refers to a system that provides a user with high quality, high quality CD, and higher service than a conventional analog broadcasting. Such digital broadcasting has developed into two types of terrestrial broadcasting and satellite broadcasting. Here, terrestrial broadcasting is a service that can receive broadcasts through a terrestrial repeater, and satellite broadcasting is a service that receives digital broadcasting using an artificial satellite as a repeater. DMB service is a representative example of digital broadcasting. DMB services are also divided into two types: terrestrial DMB and satellite DMB. As described above, the terrestrial DMB provides a broadcast service to a user through a terrestrial repeater, and the satellite DMB provides a broadcast service using an artificial satellite rather than a terrestrial repeater.

The DMB terminal for using the DMB service includes a fixed dedicated terminal used at home, a mobile dedicated terminal used while moving to a vehicle, and a portable terminal such as a PDA, a laptop, and a mobile phone.

By the way, there is a problem that the clock frequency of the liquid crystal display device employed as the display of the notebook computer and the frequency of the DMB broadcasting medium interfere. For example, a display with a resolution of 1280x800 has a clock frequency of 68.9 MHz, with a DMB frequency of 206.7 MHz, which is a tripled frequency of this frequency, interfering with the clock frequency of the display. This problem occurs frequently when using a DMB dual-use notebook computer used abroad. In other words, different DMB frequencies are set in different countries. If a laptop computer used in Korea is used overseas, the DMB frequency of the country and the clock frequency of the display of the laptop computer may cause interference. Accordingly, there is a problem that the DMB reception sensitivity is lowered and the image quality is lowered.

An object of the present invention is to provide an image display apparatus and an image display method capable of eliminating frequency interference with the DMB frequency by adjusting the display clock frequency of the DMB receiving apparatus.

Another object of the present invention is to set and store various clock frequency ranges available for Extended Display Indentification Data (EDID) for storing display information of a DMB receiving device, and adjust the clock frequency of the display according to a user's request. An image display device and an image display method capable of eliminating frequency interference between a clock frequency and a DMB frequency are provided.

An image display device according to the present invention comprises: a DMB receiver for receiving a DMB signal and outputting video, audio, and data signals; A display unit displaying video data received through the DMB receiving unit on a screen; An EDID that stores data related to the display unit, and sets and stores various available clock frequency ranges of the display; A memory for storing the EDID; And a controller for adjusting the available clock frequency range of the EDID according to a user's request and displaying a screen based on the available clock frequency range.

The display includes a liquid crystal display or an OLED.

The EDID is stored in memory.

The memory includes an EEPROM.

The image display method according to the present invention comprises the steps of setting a variety of usable clock frequency range of the display and storing in the EDID; Requesting a user to improve the image quality when the image quality is degraded by mutual interference between the clock frequency and the DMB frequency of the display; Changing a usable clock frequency range set by the display controller according to the user's request and displaying a screen according to the changed clock frequency; Checking whether an image quality of a screen displayed according to the changed clock frequency is improved; And changing the usable clock frequency range set in the EDID until the image quality is improved if the image quality is not improved as a result of the checking.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is an example of a DMB receiving apparatus according to the present invention, which is a diagram for explaining the external structure of a DMB combined laptop computer.

Referring to FIG. 1, a notebook computer is a computer which is small in size, light in weight, and operated by a secondary battery, and thus can be used regardless of location, and includes a base unit 10 having an input means such as a keyboard 17. ) And a display unit 20 provided with a liquid crystal display device 21 for displaying the processing result of the data input by the input means to the user.

The display unit 20 includes a back cover 22 supporting the liquid crystal display device 21 and a front cover 23 coupled to the back cover 22. The base unit 10 includes an upper case 11, Information processing unit such as a lower case 12, a main board, a CPU, various chipsets, and a hard disk, a data input means including a keyboard 17 and a touch pad 18, a LAN card (not shown) for supporting wired and wireless data communication, and the like. The base unit 10 and the display unit 20 are connected by the hinge unit 40 to be collapsible.

The notebook computer having such a structure folds the display unit 20 and the base unit 10 to be held by being held by the latch 30, and when used, releases the latch 30 and releases the latch 30. The display unit 20 is unfolded at an appropriate angle so as to conform to. When the display unit 20 is opened, the user performs a predetermined task through the data input means of the base unit 10, and the result of data processing is displayed on the liquid crystal display device 21 of the display unit 20. .

In addition, in order to receive the DMB signal, the notebook computer is provided with a DMB receiving module for viewing the DMB and a receiving antenna 50 electrically connected to the DMB receiving module. A connection jack 52 is provided at one end of the base unit 10 of the notebook computer so that the reception antenna 50 can be detached and grounded to the DMB reception module, and the connection jack 52 and the DMB reception module of the information processing unit are provided. The DMB is activated by the liquid crystal display device 21 of the display unit 20 by being connected to the data line, so that the user can view it.

In addition, the connection between the antenna receiving the DMB signal and the notebook computer is provided with a socket (for example, a slot into which a LAN card is inserted) in the notebook computer so as to be interoperable or compatible with other devices, and the antenna may be detachable from the socket. .

2 is a schematic configuration diagram of a DMB receiving apparatus including a DMB receiving module and a display capable of adjusting a clock frequency according to the present invention.

2, the tuner 100, the A / D converter 110, the decoder 120, the outer decoder 130, the D / A converter 140, the speaker 150, and the DMB controller 160. , MPEG-2 TS Demultiplex 170, MPEG-4 System Decoder 180, MPEG-4 AVC Decoder 190, MPEG-4 Audio Decoder 200, and Display 210.

The DMB controller 160 controls the operation of the tuner 100, the decoder 120, etc. according to a user's request to receive any one DMB broadcast channel. For example, terrestrial DMB broadcasting provides broadcasting service using VHF (12 or 8 channel) band, one channel is assigned three ensembles (eg, a kind of broadcasting station), and one ensemble has a plurality of ensembles. There is a broadcasting station. In addition, a broadcasting station can select and transmit a desired broadcasting signal among audio, video, and data. The data transmission speed of audio broadcasting is 128Kbps, the data transmission speed of video broadcasting is 500Kbps, and the data transmission speed of the ensemble is 1.5Mbps. The ensemble will have about 10 audio and 2 video services.

The DMB broadcast signal received through the tuner 100 is converted into a digital signal by the A / D converter 110 and then includes, for example, a DAB channel decoder and a musiccam decoder. The decoder 120 decodes the digital broadcast data stream, and the outer decoder 130 performs an error correction (ECC) operation on the decoded broadcast data stream.

Meanwhile, the MPEG-2 TS demultiplex 170 demultiplexes an error corrected data stream into separate MPEG-4 video, audio, and data information, and the MPEG-4 system decoder 180 separates the data stream. The output data information is decoded, and the MPEG-4 AVC (Advanced Video Coding) decoder 190 decodes the output video data.

In addition, the MPEG-4 audio decoder 200 decodes the audio data separately output. The audio and video data are output timing controlled by the data information, and the data information is displayed on the display 210 together with the video data. Can be displayed. The display 21 includes a liquid crystal display device and an OLED.

In the memory 220 such as an EEPROM (Electrically Erasable and Programmable Read Only Memory) embedded in the display 210, configuration information and control information of the display 210 are stored in an Extended Display Indentification Data (EDID) format. EDID is a data format provided by the Video Electri \ onics Standards Association (VESA) .It is a product number (Serial No.) indicating the date of manufacture of a product, a model name of a product, a manufacturer's ID, and a clock that can be used. Information such as the frequency range and whether or not display power management signaling is supported is included. In the present invention, the usable clock frequency range of the EDID is set in various ways, and the EDID is stored in the memory 220.

The display controller 230 controlling the display 210 obtains configuration information and control information of the display 210 stored in the memory 220 using the I2C communication method with the memory 210, and then displays a display suitable for the display 210. Data and control data are transmitted, and the available clock frequency range of the EDID stored in the memory 220 is changed according to a user's request and transmitted as display data.

3 is a flowchart illustrating a method of driving a DMB receiving apparatus according to the present invention, which is a flowchart illustrating a procedure of changing a display clock frequency of a DMB receiving apparatus that is interfering with the DMB frequency.

EDID including information such as the date of manufacture of the display, the serial number representing the model name, the manufacturer's ID, the available frequency range, and whether or not the display power management signaling is supported. Set the available frequency range of the various and stores the EDID in the memory (S100).

In a specific region, for example, a foreign country using a different DMB frequency than the domestic one, a picture quality of a screen displayed on the display may be degraded due to mutual interference between the clock frequency of the display and the DMB broadcasting medium frequency (S200). For example, a display with a resolution of 1280x800 has a clock frequency of 68.9 MHz, with a DMB frequency of 206.7 MHz, which is three times the frequency of this clock frequency, interfering with the clock frequency of the display. Therefore, when the DMB frequency and the clock frequency of the display interfere with each other and the image quality of the display is degraded, the range of the available clock frequencies is changed so as not to cause mutual interference with the DMB frequency of 206.7 MHz. To this end, the display controller changes the available clock frequency range of the EDID stored in the memory according to a user's request (S300), and displays a screen according to the changed clock frequency (S400).

Check whether the image quality of the displayed screen is improved according to the changed clock frequency (S500).

If the result of the check is that the image quality is improved, it is viewed as it is. If the image quality is not improved, the display controller changes the available clock frequency range set in the EDID.

As described above, according to the present invention, various clock frequency ranges available for the EDID for storing display information are set and stored, and image quality is degraded due to mutual interference between the display clock frequency and the DMB frequency of a DMB receiving apparatus such as a notebook computer. If you do, you can change the available clock frequency range of the EDID and display the screen accordingly so that you can use the DMB anywhere in any location.

Claims (5)

A DMB receiver for receiving a DMB signal and outputting video, audio, and data signals; A display unit displaying video data received through the DMB receiving unit on a screen; An EDID that stores data related to the display unit and variously sets and stores a usable clock frequency range of the display unit; And And a controller for adjusting the available clock frequency range of the EDID according to a user's request and displaying a screen based on the available clock frequency range. The image display device of claim 1, wherein the display comprises a liquid crystal display device or an OLED. The image display device of claim 1, wherein the EDID is stored in a memory. 4. The image display device of claim 3, wherein the memory comprises an EEPROM. Varying the available clock frequency range of the display and storing it in the EDID; Requesting a user to improve the image quality when the image quality is degraded by mutual interference between the clock frequency and the DMB frequency of the display; Changing a usable clock frequency range set by the display controller according to the user's request and displaying a screen according to the changed clock frequency; Checking whether an image quality of a screen displayed according to the changed clock frequency is improved; Changing the usable clock frequency range set in the EDID if the image quality is not improved as a result of the checking.

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