KR100686171B1 - Method and apparatus of reulating picture - Google Patents

Abstract

An object of the present invention is to provide a screen adjusting method and apparatus for compensating a black level in accordance with human optic nerve characteristics by outputting a black image to a screen adjusting band on a predetermined portion of the screen according to external brightness. The present invention achieves the above object and the screen adjusting method of the display device according to the present invention for solving the problems of the prior art comprises the steps of reducing the image output area of the screen; And outputting a screen adjustment band in which a black image is output in a margin part as the image output area of the screen is reduced. In addition, the screen adjusting apparatus according to the present invention includes a video signal processor for processing video data; A video signal output unit configured to output video data output by the video signal processor as an image; A brightness sensor unit for sensing external brightness; A memory unit for storing a black level value corresponding to an external brightness value; The black level value corresponding to the external brightness value sensed by the brightness sensor unit is read from the memory unit, the image output area of the screen is reduced, and the black level value corresponds to the margin part as the image output area of the screen is reduced. And a controller for controlling the video signal processor to output a screen adjustment band for outputting a black image.

 Display device, screen adjustment

Description

Screen adjustment method and device {METHOD AND APPARATUS OF REULATING PICTURE}

1 is a configuration diagram of a display device to which the present invention is applicable.

FIG. 2 is a structural diagram of a memory unit of FIG. 1; FIG.

3 is a diagram showing a screen display example according to a preferred embodiment of the present invention.

4 is a flowchart of a screen adjusting method according to a preferred embodiment of the present invention.

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

100: control unit

102: memory

104: micom

106: user interface unit

108: tuner

110: broadcast signal processing unit

112: video signal processing unit

114: video signal output unit

116: Audio Decoder

118: audio signal output unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display apparatus, and more particularly, to a screen adjusting method and apparatus capable of outputting a clear image even when an external environment changes.

In general, a display device such as a television broadcast receiver improves image quality by compensating for black level by adjusting contrast or brightness. This method makes it possible to control factors related to image quality such as contrast or brightness, and to set a display format suitable for the user's viewing environment for ease of use, and the user can select one of the display formats. It is implemented to select.

However, even if the black level is compensated according to the above-described conventional technique, when the screen is output in a very dark place such as a dark room, the black level is recognized brightly due to the characteristics of the human optic nerve, and thus a low quality image with low contrast ratio and sharpness is output. There was a problem of being mistaken.

Unlike the above, in the related art, a technique has been proposed in which the contrast ratio is improved by treating the brightness as a black at a predetermined luminance level or less while maintaining the maximum white value.

This prior art has the effect of lowering the black level without losing the contrast ratio, but it does not lower the absolute black level. Therefore, when outputting the screen in a very dark place such as a dark room, the black level is recognized brightly due to the characteristics of the human optic nerve. There was a problem that it was mistaken that an image of low quality with reduced ratio and sharpness was output.

Accordingly, the development of a technology capable of providing a high-quality image by compensating the black level according to the characteristics of the human optic nerve even in a dark place such as a dark room is urgently needed.

The present invention is to overcome the above-mentioned problems, screen output method that can compensate for the black level in accordance with the characteristics of the human optic nerve by outputting a black image on the screen adjustment band to a predetermined portion of the screen according to the external brightness And an apparatus.

According to another aspect of the present invention, there is provided a method for adjusting a screen of a display device, the method including: reducing a video output area of a screen by a predetermined distance toward a center; And outputting a screen adjustment band of a black image in a predetermined width to a screen margin margin as the image output area of the screen is reduced.
Outputting a screen adjustment band of the black image; Sensing external brightness; Storing a black level value corresponding to a value of sensing the external brightness; And outputting a black image corresponding to the black level value to the screen adjustment band.
The screen adjustment band is displayed only when the value of sensing the external brightness is equal to or less than a preset reference value.
In addition, the screen adjusting apparatus of the present invention, the screen adjusting apparatus of the display device, the video signal processing unit for processing video data; A video signal output unit configured to output video data output by the video signal processor as an image; A brightness sensor unit for sensing external brightness; A memory unit for storing a black level value corresponding to an external brightness value; Screen edge margins as the black level value corresponding to the external brightness value sensed by the brightness sensor unit is read from the memory unit, the image output area of the screen is reduced by a predetermined distance toward the center, and the image output area of the screen is reduced. And a controller configured to control the video signal processor to output a screen adjustment band of a black image corresponding to the black level value in a predetermined width.
The controller displays the screen adjustment band only when the value of sensing the external brightness is equal to or less than a preset reference value.

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The present invention places a screen adjustment band for compensating the black level at the edge portion of the screen and displays a black image on the screen adjustment band to cause a contrast adjustment effect in accordance with human optic nerve characteristics.

In particular, the black level value of the black image is changed according to the external brightness, so that a high quality image can be viewed even in a very dark environment.

The configuration of the television broadcast receiver to which the present invention described above is applicable will be described with reference to FIG. Herein, the present invention is applicable to all display devices, but only an example applied to a television broadcast receiver is described.

The control unit 100 controls the television broadcast receiver as a whole, and according to the preferred embodiment of the present invention, the black image having the black level value corresponding to the value of the external brightness is positioned at the edge of the screen. Display on the screen adjustment band.

The memory unit 102 stores various information including a processing program of the control unit 100, and in particular, adjusts screens corresponding to a plurality of external brightness values as shown in FIG. 2 according to an exemplary embodiment of the present invention. The black level value of the band is stored, and the black level value of the first to Nth screen adjustment bands corresponding to the first to Nth brightness values is a value that provides a contrast adjustment effect in accordance with human optic nerve characteristics through experiments or the like. It is decided.

The microcomputer 104 provides various commands or information of the user through the user interface unit 106 to the controller 100.

The tuner 108 tunes a broadcast signal of a channel under the control of the controller 100 among the broadcast signals and provides the tuner 108 to the broadcast signal processor 110.

The broadcast signal processor 110 restores the broadcast signal to a transport stream and provides the broadcast signal to the video signal processor 112.

The video signal processor 112 restores the audio stream, the video stream, and the data stream from the transport stream provided by the broadcast signal processor 112 provided by the broadcast signal processor 110 under the control of the controller 100. The video stream is restored to video data and output through the video signal output unit 114. The video signal processor 112 provides the audio stream to the audio decoder 116. The audio decoder 116 restores the audio stream to audio data and outputs the audio stream through the audio signal output unit 118.

In addition, the video signal processing unit 112 reduces the image output area of the screen under the control of the control unit 100 and black image corresponding to the black level value of the screen adjustment band to the screen adjustment band located at the edge of the screen. Is displayed.

The brightness sensor unit 120 is installed to be exposed to the outside of the television broadcast receiver, senses the external brightness of the television broadcast receiver, and provides the result to the controller 100.

A screen adjustment method according to a preferred embodiment of the present invention applicable to the television broadcast receiver will now be described with reference to FIG.

The control unit 100 of the television broadcast receiver measures the external brightness through the brightness sensor unit 120 (400). When the measurement of the external brightness is completed, the controller 100 reads the black level value of the screen adjustment band corresponding to the measured external brightness value from the memory unit 102 (step 402). When the black level value of the screen adjustment band corresponding to the measured external brightness value is read out, the controller 100 reduces the image output area for outputting the video signal from the broadcast signal and reduces the size of the reduced image output area. A black image corresponding to the black level value of the read screen adjustment band is displayed on the screen adjustment band positioned at the edge of the screen, which is a margin (step 404).

Here, referring to FIG. 3 illustrating a screen on which the screen adjustment band is displayed, an image reconstructed from an actual television broadcast signal is displayed in a predetermined area P around the center of the screen. The screen adjustment band B is displayed at the edge of the screen, and the screen adjustment band is output as a black image.

As described above, the present invention outputs a black image to a screen adjustment band on a predetermined portion of the screen according to an external environment, thereby compensating the black level in accordance with the characteristics of the optic nerve of a human.

In the above-described preferred embodiment of the present invention, only the black level value of the black image output to the screen adjustment band is changed to correspond to the external brightness, but the screen adjustment is performed only when the external brightness sensing value is lower than a predetermined value such as a dark room. You can also output a black image to the band.

As described above, the present invention outputs a black image on the screen adjustment band to a predetermined portion of the screen according to the external brightness, thereby compensating the black level according to the optic nerve characteristics of the human.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible.

Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

Claims (5)

In the screen adjustment method of the display device, Reducing the image output area of the screen toward a center by a predetermined distance; Outputting a screen adjustment band of a black image in a predetermined width on a screen margin margin as the image output area of the screen is reduced; Screen adjustment method for a display device characterized in that it comprises a. The method of claim 1, Outputting a screen adjustment band of the black image; Sensing external brightness; Storing a black level value corresponding to a value of sensing the external brightness; And outputting a black image corresponding to the black level value to the screen adjustment band. The method of claim 2, And the screen adjustment band is displayed only when the value of sensing the external brightness is equal to or less than a preset reference value. In the screen adjustment device of the display device, A video signal processor which processes video data; A video signal output unit configured to output video data output by the video signal processor as an image; A brightness sensor unit for sensing external brightness; A memory unit for storing a black level value corresponding to an external brightness value; Screen edge margins as the black level value corresponding to the external brightness value sensed by the brightness sensor unit is read from the memory unit, the image output area of the screen is reduced by a predetermined distance toward the center, and the image output area of the screen is reduced. A controller configured to control the video signal processor to output a screen adjustment band of a black image corresponding to the black level value to a predetermined width at a; Screen adjustment apparatus comprising a. The method of claim 4, wherein And the control unit displays the screen adjustment band only when the value of sensing the external brightness is equal to or less than a preset reference value.

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