KR100628099B1 - Video display device and method for controlling brightness thereof - Google Patents

Abstract

According to the present invention, when the brightness of the entire screen is sensed to realize a clearer screen, the image display apparatus capable of clearing the brightness of all images on the screen by sensing the brightness in each area in the case of a screen larger than a double window. And a brightness adjusting method thereof. As described above, the present invention provides a scaler for scaling image data according to a resolution, a display unit for displaying the scaled image, a frame memory unit for storing the image data as a frame, and the two stored in the frame memory unit. An adaptive gamma correction unit for adaptively compensating brightness data of each broadcast video frame with respect to the frames of the broadcast video is provided. Therefore, according to the present invention, an image display device capable of displaying a double window or more screen can brighten the screen of each screen area more clearly.

Display device, brightness

Description

Video display device and method for controlling brightness

1 is a block diagram illustrating a conventional image display apparatus;

2 is a view for explaining screen brightness sensing in a display area of an image display apparatus according to the related art.

3 is a view for explaining a gamma characteristic of a screen in an image display apparatus according to the related art.

4 is a block diagram illustrating a video display device according to the present invention.

5 is a diagram illustrating screen brightness sensing in a display area of an image display device according to an exemplary embodiment of the present invention.

6 is a view for explaining a gamma characteristic of a screen in an image display apparatus according to the present invention.

7 is a flowchart illustrating a method of adjusting brightness in an image display apparatus according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: frame memory unit 20: scaler unit

40: display unit 50: image mixing unit

70, 80; Double window area

The present invention relates to an image display device and a brightness control method thereof. In particular, when a brightness of the entire screen is to be sensed to realize a clearer screen, a screen of more than a double window senses brightness in each area of the screen. The present invention relates to an image display apparatus capable of sharpening the brightness of all images and a method of adjusting the brightness thereof.

Broadcasting is a mass media that targets an unspecified number, which is advantageous because it can be compressed like computer data compression because all elements (video, audio, data) are treated digitally.

After color TV broadcasting, stereo sound, remote control device, subtitle broadcasting, data broadcasting, etc. have adopted some digital technologies. In the 90's, computer and network technologies have been spreading more rapidly, so that the broadcasting field can realize high-definition and multifunctional TV. Digital TV was pursued as a video device.

In the case of digital TV (hereinafter, DTV), one program of HDTV level and three or more programs of SDTV level can be transmitted to one channel, and digital signal transmission and processing make it possible to enjoy a much cleaner screen. The ghost phenomenon can be solved on its own, and radio waves reflected by obstacles can be solved on their own.

Looking at the status of domestic broadcasting, after the pilot broadcast in 2000, the metropolitan area is performing the main broadcast in 2002, the metropolitan city is scheduled for 2004, and will complete the conversion of DTV broadcasting by 2010.

Recently, DTV has been implemented using LCD, PDP or OLED (ORGANIC LIGHT EMITTING DIODES) modules as well as CRT or projection TV. Such LCDs, PDPs, and OLEDs have the advantage of being considerably thinner than CRTs or projection methods.

Such display devices are attracting attention not only as TVs but also as monitors of computers, and they are still expensive. However, they are already popularized or widely used as monitors of TVs. Doing.

In addition, almost all TVs recently released are provided with a double window method of simultaneously displaying two screens through PIP (Picture in Picture) or POP (Picture On Picture).

Hereinafter, an image display apparatus according to the related art will be described with reference to the accompanying drawings.

1 is a block diagram illustrating an image display apparatus according to the prior art, FIG. 2 is a diagram illustrating screen brightness sensing in a display area of the image display apparatus according to the prior art, and FIG. FIG. 7 is a diagram illustrating a gamma characteristic of a screen in an image display device.

The image display apparatus according to the related art displays a scaler 20 for scaling image data according to a resolution, and displays two or more broadcast images on one display unit 40 with a double window (PIP or POP). The image mixing unit 50 for mixing the image, the display unit 40 for displaying the image, the frame memory unit 10 for storing the input image frame, and the image frame stored in the frame memory unit 10 to read the image. It consists of an adaptive gamma correction unit 30 for adaptively compensating for brightness.

In this case, in order to compensate for the brightness of the image in the related art, the adaptive gamma correction unit 30 adjusts the average of the overall brightness data of the screen with respect to the entire screen area 60 of the display unit 40 as shown in FIG. 2. Obtained. In this case, the adaptive gamma correction unit 30 changes the brightness of the image signal according to the brightness of the screen by changing the gamma characteristic as shown in FIG. 3 with respect to the image signal.

However, in the image display apparatus according to the related art, it can be seen from FIG. 3 for explaining the gamma characteristic of the screen that the brightness of the screen is related to the driving voltage. In the above case, when one screen is dark and one screen is bright, the average value of the detected image has a different value from that of the original image, thereby correcting the screen brightness with an incorrect gamma value.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to sense the brightness in each area when the image signal displayed on the display device is displayed on a screen more than a double window brightness of all the images of the screen It is to provide an image display device and a brightness control method that can be more clear each.

In order to achieve the above object, the present invention provides a scaler for scaling image data according to a resolution, a display unit for displaying the scaled image, a frame memory unit for storing the image data as a frame, and the frame memory unit. And an adaptive gamma correction unit for adaptively compensating brightness data of each broadcast image frame with respect to the frames of the two or more broadcast images stored in the apparatus.

In this case, the adaptive gamma corrector may separately obtain a characteristic of a gamma curve according to an average of brightness data of each of the two or more broadcast images of the display unit.

In order to achieve the above object, the present invention provides a method of sensing screen brightness for each screen area when the screen area for displaying an image displayed through the display unit is divided, and for each screen area according to the sensing result. It provides a method of adjusting the brightness of the image display device, characterized in that it comprises the step of adaptively changing the screen brightness.

In this case, when the screen is divided, it is preferable that two or more broadcasts are displayed through one of the PIP and POP methods through the display unit.

Therefore, according to the present invention, when displaying a screen of more than a double window, the brightness in each area can be made more clear.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

4 is a block diagram illustrating an image display device according to the present invention, FIG. 5 is a view for explaining screen brightness sensing in a display area of the image display device according to the present invention, and FIG. FIG. 7 is a diagram illustrating a gamma characteristic of a screen in an image display apparatus.

The video display device according to the present invention is a scaler 20 for scaling image data according to a resolution, and when two or more broadcast images are respectively displayed on one display unit 40 with a double window (PIP or POP). Image mixing unit 50 for mixing the image, display unit 40 for displaying an image, frame memory unit 10 for storing an input image frame, and the two or more stored in the frame memory unit 10. The adaptive gamma corrector 100 is configured to adaptively compensate brightness data of each broadcast video frame with respect to the frame of the broadcast video.

That is, in the present invention, in order to compensate for the brightness of the image, the adaptive gamma correction unit 100 broadcasts the broadcast image of each of the first and second screen areas 70 and 80 of the display unit 40 as shown in FIG. 5. The average of the brightness data of the frame is separately obtained and the characteristics of the gamma curve are separately obtained as shown in FIG.

That is, each gamma characteristic curve is changed for each screen of the first screen area 70 (A) and the second screen area 80 (B).

7 is a flowchart illustrating a method of adjusting brightness in an image display apparatus according to the present invention.

If the brightness control method in the image display device according to the present invention is set to operate with the adaptive screen brightness (S10), it is determined whether the screen of the display unit is divided (S20). That is, it is determined whether the broadcast video is displayed by one of the PIP or POP methods.

If it is determined that the screen is not divided (S20), the brightness of the entire screen is sensed (30) and, accordingly, the brightness of the entire screen is adaptively compensated (S40).

However, if the screen is divided (S20), the screen brightness for each area is sensed (S50), and accordingly the screen brightness for each area is adaptively changed (S60).

In the image display device and its brightness control method according to the present invention, if there are two or more broadcast images displayed on the display unit, the brightness is sensed in each area and the gamma correction is performed in each area to thereby perform a double window or more. There is an effect that can provide a clear screen for each screen.                     

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (4)

A scaler for scaling image data according to a resolution; A display unit which displays the scaled image; A frame memory unit which stores the image data as a frame; An adaptive gamma correction unit for adaptively compensating brightness data of each broadcast video frame with respect to the two or more frames of the broadcast video stored in the frame memory unit. Including, The adaptive gamma correction unit separately obtains a characteristic of a gamma curve according to an average of brightness data of each broadcast video frame of the two or more broadcast images, and the display unit displays the two or more broadcast images on one screen. Image display device, characterized in that. delete Determining an average of brightness data for each area of the screen when the screen area for displaying an image displayed through the display is divided; Obtaining characteristics of a gamma curve according to the average determination result; Adaptively compensating screen brightness data for each screen region according to the characteristics of the gamma curve How to adjust the brightness of the image display device comprising a. The method of claim 3, wherein If the screen is divided, the brightness control method of the video display device, characterized in that the two or more broadcasts are displayed by one of the PIP or POP method through the display unit.

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