KR20080032828A - Image display device and control method of resolution using it - Google Patents

Abstract

A video display device and a resolution control method using the same are provided to output an image signal of resolution which is not supported on a screen by using a software algorithm without changing hardware. An image signal is received from the exterior(S100) and an image mode is discriminated according to horizontal and vertical synchronous signal frequencies of the inputted image signal(S110). If the image has resolution which is not supported by a video display device according to the discriminated image mode, a controller controls an OSD(On Screen Display) generating unit to display a message of 'out of range' and precise timing information of the image signal(S120,S130). The controller reduces a frequency of a source by reducing the number of samplings in capturing the image signal(S140). When the under-sampled image signal is processed to have resolution which can be supported by the video display device(S150), a corresponding message informing the user about the under-sampled and outputted signal is displayed as OSD(S160). The controller provides the under-sampled image signal to an image processing unit, and the image processing unit outputs the image signal on a screen(S170).

Description

IMAGE DISPLAY DEVICE AND CONTROL METHOD OF RESOLUTION USING IT}

1 is a block diagram showing the configuration of a video display device according to an embodiment of the present invention;

2 is a flowchart illustrating a method of adjusting a resolution of a video display device according to an embodiment of the present invention;

3 is a screen state diagram illustrating a message displayed when a resolution-adjusted screen is provided according to an embodiment of the present invention.

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

10: control unit 20: memory unit

30: A / D Converter 40: PLL (Phase Locked Loop)

50: image processing unit 60: OSD generation unit

70: display unit

The present invention relates to an image display device, and more particularly, when an image signal which is not supported by the image display device is input, an image display device which undersamples the input image signal to be displayed on a screen; It relates to a resolution control method using the same.

In general, a video display device is a device for displaying a video signal of a predetermined format transmitted from a broadcasting station on a screen through a series of signals, such as digital sampling and scaling, according to the development of modern technology in a small display device using a cathode ray tube. According to the trend of increasing the size of the video display device, a digital method using an LCD is being used as a representative flat panel display device suitable for a large display device.

In addition, the image display capability of the image display device is represented by a resolution, and may be classified into VGA, SVGA, XGA, SXGA, and the like.

Here, among the high resolutions of standard (VESA) timing, there are reduced blanking timings for lowering the base resolution and source clock, and resolution CVT timings for TVs. Was unable to determine whether the resolution was in redox timing or native resolution.

Recently, the resolution that can be input as the flat TV display reduction is getting higher, but if the scaler can only support the reduction timing when using the existing technology, from the user's point of view is the same resolution, some timings, and some timings There is a problem that does not come out and cause confusion.

That is, if the video display device is a Full HD display panel, the TV supports up to Full HD format and the PC input supports 1920 * 1080 or 1920 * 1200 resolution. However, currently produced scalers only support up to 154Mhz or 165Mhz, so there is a limit to receiving more than Full HD sources.

For example, among the two formats of 1920 * 1080 60hz VESA-CVT: 173Mhz, 1920 * 1080 60hz VESA: Redox Blacking Timing: 138.6Mhz, CVT timing cannot show video in 'out of range' There was a problem showing only the redox blacking timing.

Thus, the user can determine whether their graphics card is a redox blacking timing or a CVT timing.

If you do not know whether the screen does not come out connected to the PC or laptop output in the CVT timing, there was a problem that is mistaken.

The present invention is to solve the above problems, an object of the present invention is to input a video signal having a resolution that is not supported by the video display device until a source clock that can support the signal comes out? An image display device for automatically undersampling and displaying a corresponding image and a resolution adjusting method using the same are provided.

According to an aspect of the present invention, there is provided a method of adjusting a resolution of a video display device, the method comprising: receiving a video signal from an external device, determining a type of a video mode according to a frequency of an input horizontal / vertical sync signal, and a video mode; Determining whether the resolution is supported, performing an undersampling process to reduce the number of sampling of the video signal when the video signal is not supported, and when the video signal is undersampled to the supported resolution, And displaying the video signal on the screen.

In this case, when the input video signal is a resolution that cannot be supported, timing information may be displayed together with a message indicating that the signal is an 'Out of Range' signal.

Here, the step of undersampling the video signal is to reduce the clock frequency of the source, and when the video signal is undersampled by the clock of a source that can be supported and displayed on the screen, a message indicating that the video signal is undersampled and a reduction ratio of the screen together It is characterized by displaying.

Further, the image display apparatus, A / D converter and horizontal / vertical sync signals to convert a portion emitter input analog R / G / B image signals to the outside into a digital image signal for achieving the object of the present invention described above Determines the type of image mode according to the frequency, checks whether the image mode is a resolution that can be supported, and if the image signal is not supported, performs an undersampling process that reduces the number of sampling of the image signal. And a control unit for controlling the undersampling to a supported resolution and a display unit for displaying the undersampled video signal on the screen.

Here, the control unit is characterized in that to reduce the clock frequency of the source.

In this case, the display unit displays timing information together with a message indicating that the image signal is an 'out of range' signal when the resolution is not supported.

The apparatus further includes an OSD generator for generating and providing a message indicating that the image is undersampled and reducing ratio data of the screen when the image signal is undersampled by a clock of a source that can be supported and displayed on the screen.

Hereinafter, an accompanying display will be described in detail with respect to an image display device and a resolution adjusting method using the same according to an embodiment of the present invention.

1 is a block diagram schematically illustrating a video display device according to an embodiment of the present invention.

As shown in FIG. 1, an image display device according to an exemplary embodiment of the present invention includes a control unit 10 which controls the image device as a whole, and a PLL (Phase Locked Loop) which generates a clock pulse under the control of the control unit 10. , 40), an A / D converter 30 for converting an input R / G / B video signal into a digital signal, an image processor 50 for processing an image signal on a screen, and an image processor Memory unit 20 for storing the output of the 50, the display unit 70 for displaying the image signal on the screen and the OSD generator 60 for providing information of the image signal in accordance with the control signal of the control unit 10 It includes.

First, the controller 10 controls the image display apparatus as a whole. In particular, according to an embodiment of the present invention, the controller 10 determines a mode of the image signal whether the image signal transmitted from the outside is a signal that can be supported by the image display apparatus. That is, the video signal is received from the outside and the type of the video mode is determined according to the frequency of the input horizontal / vertical synchronization signal.

In this case, when the input image signal does not support the resolution, the controller 10 reduces the sampling frequency of the image signal and automatically undersamples the clock until the clock of the supportable source is output.

The PLL 40 generates a clock pulse according to the control signal of the controller 10.

The A / D converter 30 samples an externally input R / G / B video signal according to a clock pulse supplied from the PLL 40 and converts the R / G / B video signal into a digital R / G / B video signal.

The image processor 50 processes the undersampled image signal transmitted from the controller 10 into an image signal that can be displayed on the screen.

The OSD generator 60 generates a message indicating that the image signal is undersampled and reduction ratio data of the screen when the image signal is undersampled by a clock of a source capable of being supported and displayed on the screen.

A resolution adjusting method according to an embodiment of an image display device having such a configuration will be described with reference to FIG. 2 as follows.

2 is a flowchart sequentially illustrating a resolution adjusting method according to an embodiment of the present invention.

As shown in FIG. 2, the resolution adjusting invention of an image display device according to an exemplary embodiment of the present invention receives or receives an image signal from an external device (S100) according to horizontal and vertical synchronization signal frequencies of an input image signal. The image mode is determined (S110).

After that, when the determined image mode is a resolution that can be supported by the image display apparatus (S120), the controller 10 controls to output the corresponding image signal on the screen (S170).

Meanwhile, when an image signal having a resolution that the determined image mode is not supported by the image display apparatus, that is, a resolution higher than the resolution supported by the image display apparatus is input, the controller 10 may notify the user of the OSD generator 60. ).

The OSD generator 60 controls the timing of the video signal with an 'out of range' message indicating that the video signal currently input under the control of the controller 10 has a higher resolution than that supported by the video display device. ) Information is displayed (S130).

Thereafter, the controller 10 reduces the frequency of the source by reducing the number of sampling when capturing the image signal in order to display the input high resolution image signal on the screen (S140).

Here, the controller 10 continuously undersamples the input video signal and automatically samples the clock until a clock of a source that can be supported by the video display device is output.

Subsequently, when the undersampled image signal is processed at a resolution that can be supported by the image display apparatus (S150), the control unit 10 may not perform the undersampling of the image signal instead of a signal having the originally input resolution before providing the image signal to the screen. And displays a message for informing the user that the signal is an output signal through the OSD (S160). In this case, the OSD may generate and provide reduction ratio data of the screen.

Subsequently, the control unit 10 provides the image processor 50 to display the undersampled image signal on the display unit 70, and the image processing unit 50 outputs the image signal to the screen (S170). .

In this case, the size of the image displayed on the screen may be smaller than the original image, but the image having a resolution not supported unlike the conventional image may be displayed on the screen.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments without departing from the spirit of the present invention as claimed in the claims. Of course, any person skilled in the art can make various modifications, and such changes are within the scope of the claims.

According to the present invention as described above, when a high resolution video signal that is not supported by the video display device is input, the user may 'out of range' by providing an image by undersampling the video signal until a supported source clock is provided. The video can also be watched for the signal, thereby enhancing the satisfaction.

In addition, an image signal having a resolution not supported by a software algorithm alone without a hardware change may be output to a screen.

Claims (8)

Receiving an image signal from an external source and identifying a type of image mode according to the frequency of the input horizontal / vertical synchronization signal; Determining whether the video mode is a supported resolution; Performing an undersampling process to reduce the number of sampling of the video signal when the video signal has a resolution that cannot be supported; And  If the video signal is undersampled at a resolution that can be supported, displaying the video signal on a screen. The method of claim 1, And displaying timing information together with a message indicating that the video signal is an unsupported resolution. The method of claim 1, wherein the undersampling of the video signal comprises: A method for adjusting the resolution of an image signal, characterized by reducing the clock frequency of the source. The method of claim 1, When the video signal is undersampled by a clock of a source that can be supported and displayed on a screen, displaying a message indicating that the video signal is undersampled together with a reduction ratio of the screen. An A / D converter for converting an analog R / G / B video signal input from the outside into a digital video signal; Determines the type of image mode according to the frequency of the horizontal / vertical synchronization signal, checks whether the image mode is a resolution that can be supported, and reduces the number of sampling of the image signal when the image signal is not supported. A controller configured to perform an undersampling process so that the image signal is undersampled at a resolution that can be supported; And And a display unit for displaying the undersampled image signal on a screen. The method of claim 5, wherein the control unit A method for adjusting the resolution of an image signal, characterized by reducing the clock frequency of the source. The method of claim 5, wherein the display unit And displaying timing information together with a message indicating that the video signal is an unsupported resolution. The method of claim 5, And an OSD generator configured to generate and provide a reduction ratio data of the screen and a message indicating that the image signal is undersampled when the image signal is undersampled by a clock of a supported source and displayed on the screen.

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