KR20030084198A - display apparatus and method for adjusting the brightness thereof - Google Patents

Abstract

PURPOSE: A display system and a method of controlling luminance of the display system are provided to adjust luminance of a video signal corresponding to a desired signal region. CONSTITUTION: A display system includes a signal processor, a luminance control selector, a luminance controller(5), and a controller(9). The signal processor processes video signals. The luminance controller changes a digital level of a video signal. The controller divides the video signal into at least two regions according to the digital input level of the video signal on the basis of a choice of the luminance control selector, and controls the input level for each region to provide the video signal to the signal processor. The luminance controller includes a memory for storing a video signal level conversion table, and outputs a video signal whose digital level has been converted on the basis of the video signal conversion table according to information provided by the controller.

Description

Display apparatus and method for adjusting the brightness approximately

The present invention relates to a brightness adjustment method of a display device, and more particularly, to a display device and a brightness adjustment method of a display device that can adjust the brightness according to the input level of the image signal.

In the case of the CRT, the display apparatus receives the video synchronization signal and the R / G / B video signal applied from the video card, amplifies the video signal through the preamplifier and the main amplifier, and displays it on the display screen. In this case, the display device should output the luminance proportional to the input voltage level.

Referring to the luminance curve shown in FIG. 3, the luminance curve is a graph showing a luminance change value compared to an input voltage, with the image signal applied from an image signal source such as a computer as the horizontal axis and the luminance output from the display device as the vertical axis. The output of the display device preferably has a linear luminance curve 31a in proportion to the voltage level of the input image signal, but the actual luminance value for the input voltage level for a certain period is less than the ideal luminance value and convex downward. It is represented by the luminance curve.

This is caused by the error of each component of the display device, the difference in the luminous efficiency of the display element. On the other hand, in the computer device, the image signal is gamma-corrected in advance and applied to the display device, or the brightness of the image signal is improved through a gamma correction circuit provided in the display device.

However, the conventional gamma correction method does not accurately determine whether the level of the actual video signal is properly compensated and the degree of compensation. The uniform simple gamma correction is such that the video signal is saturated when there are many signals with high input levels. Feel gives. In addition, even in a display device that receives an image signal, output characteristics are not precisely corrected and are not uniform, so even if the improvement is somewhat improved, too dark a portion of a portion of the input signal that is too bright for the user's needs. Too bright parts could not be reproduced a bit dark.

Accordingly, an object of the present invention is to provide a display apparatus capable of adjusting the luminance of an image signal corresponding to a desired signal region by dividing it into a plurality of regions according to the input level of the video signal and adjusting the input level of the video signal for each region. To provide an adjustment method.

1 is a configuration diagram of a display device according to the present invention;

2 is a flow chart of a brightness adjustment method of a display device according to the present invention;

3 is a reference point setting screen according to the brightness adjustment method of the display device of FIG.

4A and 4B illustrate luminance adjustment screens according to selection of an area below a reference point in FIG. 3;

5A and 5B are luminance adjustment screens according to selection of a region over a reference point in FIG. 3.

* Explanation of symbols for the main parts of the drawings

1: AD converter 3: luminance controller

5: scaler 7: user input unit

9: microcomputer 11: OSD generator

13 panel driving unit 15 panel

30: reference point setting screen 31: luminance curve

33: Reference point selection icon 35: Reference point luminance adjustment icon

37: luminance adjustment icon above the reference point 40, 40b: luminance adjustment screen below the reference point

41a, 41b: Luminance Adjustment Graph 43: Brightness Adjustment Selection Icon

45: Dark1 adjustment selection icon 50a, 50b: Luminance adjustment screen above the reference point

51a, 51b: Luminance Adjustment Graph 53: Brightness Adjustment Size Selection Icon

55: Dark2 adjustment selection icon

According to the present invention, there is provided a display apparatus having a signal processing section for processing a video signal, the display apparatus comprising: a brightness adjustment selecting section, a brightness adjusting section for changing a digital level of a video signal, and a brightness adjustment selecting section; And a controller for controlling the brightness adjusting unit to divide the input level into at least two areas according to the digital input level of the video signal and to adjust the input level for each area to provide the signal processing unit.

The brightness adjusting unit may include a memory in which a video signal level changing table is stored, and outputs a video signal whose digital level is changed based on the video signal changing table according to the change information provided from the controller.

The brightness adjustment selector includes an OSD selector, and the controller displays a brightness adjustment screen for adjusting brightness by dividing the display into a plurality of areas according to an input level of the digital video signal according to the selection of the OSD selector. The brightness can be easily adjusted with reference to the screen.

The luminance adjustment screen may include a reference point selection screen for dividing the input level into a plurality of sections, a reference point abnormality adjustment screen for adjusting an input level of a video signal above the reference point based on a reference point selected on the reference point selection screen, and By including a reference point adjustment screen for adjusting the input level of the video signal below the reference point, the input level of the video signal can be adjusted for each area inside and outside the reference point.

The reference point selection screen includes at least one reference point selection icon, and the adjustment screen below the reference point and the adjustment point above the reference point preferably include a plurality of adjustment icons for adjusting the input level of the video signal below the reference point.

Meanwhile, according to another aspect of the present invention, there is provided a method of adjusting a brightness of a display device, the method comprising: presenting a reference point selection screen provided with a brightness curve; Selecting at least one reference point for dividing into a plurality of areas according to an input size of the video signal in the luminance curve; Selecting at least one of a video signal above the reference point and a video signal below the reference point; Adjusting an input level of a video signal corresponding to the selected signal region; It may also be achieved by including processing the video signal whose input level is adjusted and displaying it as an image.

The method may further include presenting a brightness adjustment screen for respectively adjusting the brightness of the video signal above the reference point and the video signal below the reference point, and separately adjusting the input levels of the video signals in the areas inside and outside the reference point.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a control block diagram of a display apparatus according to the present invention. As shown in the figure, the LCD monitor to which the present invention is applied includes an AD converter 1 for converting an analog image signal to digital, and a user input unit 3 that receives a digitized image signal from the AD converter 1 and selects a brightness adjustment. From the luminance adjusting unit 5 for adjusting the input level to the selected luminance adjusting value, the scaler 7 for receiving the digital image signal adjusted by the luminance adjusting unit 5 and adjusting it to the panel size, and from the scaler 7 A panel driver 13 for driving the LCD panel 15 so that the adjusted video signal is displayed as an image, an OSD generator 11 for generating a luminance adjustment OSD screen for adjusting the brightness of the video signal, and a user; It consists of a control part 9 which controls the brightness adjusting part 5 according to the brightness adjustment value adjusted from the selection part 3.

The controller 9 controls the OSD generator 11 when the brightness adjustment is selected through the user selector 3 to display a brightness adjustment screen (see FIGS. 3 to 5B) to be described later, and displays the brightness adjustment screen. Based on the information selected by the user selecting section 3, the display is divided into at least two areas according to the input level of the digital video signal, and the luminance is adjusted for each region. ) To control the input level of the video signal of the selected area.

The brightness adjusting section 5 includes a video signal level changing table for changing the digital input signal level according to the selection area information and the brightness adjusting information provided from the control section 9, and provided from the control section 9 according to the brightness adjustment value selected by the user. An algorithm for reading a video signal level change table based on the change information and outputting a video signal having a changed level is stored.

2 is a control flowchart of a brightness adjusting method of a display apparatus according to the present invention. Referring to Figures 3 to 5b it will be described the brightness adjustment method of the present invention as follows. As shown in the figure, when the user selects the OSD control button of the user input unit 3 provided on the lower front of the LCD monitor (S1), a menu screen (not shown) including a brightness adjustment function is displayed on the screen. When the brightness control function provided on the OSD menu screen is not selected by the OSD control buttons, a reference point setting screen (see Fig. 3, 30) to be described below is displayed on the screen as the first selection screen constituting the brightness adjustment screen. S3).

When the user selects the icon 33 of the reference point 2 on the reference point setting screen 30 (S5) and selects the luminance adjustment icon 35 below the reference point (S7), the input level below the reference point selected on the luminance curve 31a is selected. An area luminance adjustment screen (see Figs. 4A and 4B) below the reference point that can adjust the luminance with respect to is displayed (S9). Here, if the brightness adjustment 2 icon 43 is selected on the luminance adjustment screen 40a below the reference point (S11), and the storage icon is selected (S15), the area below the reference point on the abnormal luminance curve 31a is convex upward. The brightness of the image displayed by the video signal whose input level is below the reference point is adjusted to increase. On the other hand, if the shadow adjustment 2 icon 45 is selected on the luminance adjustment screen 40b below the reference point (S13) and the storage icon is selected (S15), the region below the reference point on the abnormal luminance curve 31a is convex downward. The brightness of an image displayed on an image signal having an input level below the reference point is reduced accordingly.

On the other hand, when the reference point anomaly area luminance adjustment icon 37 is selected on the reference point setting screen (see FIG. 3) (S8), the luminance above the reference point area where the luminance for the input value above the reference point selected on the abnormal luminance curve 31a can be adjusted. The adjustment screen (see Figs. 5A and 5B) is displayed (S10). When the brightness adjustment 2 icon 53 is selected on the luminance adjustment screen 50a below the reference point (S12), and the storage icon is selected (S15), the area beyond the reference point on the abnormal luminance curve 31a is adjusted to a convex curve upward and the reference point The brightness of the image displayed by the video signal having the above input level is increased. On the other hand, if the shadow adjustment 2 icon 55 is selected on the luminance adjustment screen 50b below the reference point (S14) and the storage icon is selected (S15), the region above the reference point on the abnormal luminance curve 31a is convex downward. The brightness of the image displayed by the video signal having an input level above the reference point is reduced.

As shown in FIG. 3, an abnormal luminance graph 31 for selecting a reference point from the abnormal luminance curve 31a is provided in the left region of the reference point setting screen 30, and a plurality of ideal points for selecting each reference point are provided in the right region. Adjusting the input signal luminance adjustment selection icon 35 below the reference point and the output level (luminance) for the input level above the reference point for adjusting the reference point icon 33 of the control point and the output level (luminance) for the input level below the selected reference point The input signal brightness adjustment selection icon 37 is provided for the reference point or more.

As shown in Figs. 4A and 4B, a plurality of brightness adjustment selection icons 43a and a darkness adjustment selection icon 45b are provided on the input signal brightness adjustment screens 40a and 40b below the reference point. When the brightness adjustment selection icon 43a is selected, the ideal luminance curve 31a indicating the ideal output level (luminance) for the input level below the reference point set on the ideal luminance curve 31a is upward as shown in Fig. 4A. The convex curves 45a and bright1 are adjusted, and the convexity of the upwardly convex curve increases according to the brightness adjustment levels 1, 2 and 3. On the other hand, when the darkness adjustment selection icon 43b is selected, an ideal luminance curve 31a indicating an ideal output level (luminance) for an input level below the reference point set on the luminance curve 31a is shown in Fig. 4B. It is adjusted by the convex curves 45b and Dark1, and the degree of convex is adjusted according to the darkness adjustment levels 1, 2, and 3. Accordingly, the image signal having an input level below the reference point becomes brighter or darker in accordance with the adjusted luminance curve.

Meanwhile, as illustrated in FIGS. 5 and 5B, a plurality of brightness adjustment selection icons 53 and a plurality of darkness adjustment selection icons 55 are provided on the reference point abnormal area luminance adjustment screens 50a and 50b. When the brightness adjustment selection icon 53 is selected, the ideal luminance curve 31a indicating the ideal output level (luminance) with respect to the input level above the reference point set on the ideal luminance curve 31a is shown in Fig. 5A. The convex curves 55a and Bright2 are adjusted, and the convexity of the upwardly convex curve increases according to the brightness adjustment level. On the other hand, when the darkness adjustment selection icon 55 is selected, an ideal luminance curve 31a indicating an ideal output level (luminance) for an input level below the reference point set on the luminance curve 31a is shown in Fig. 5B. The lower convex curves 55b and Dark2 are adjusted, and the convexity is adjusted according to the darkness adjustment level. Accordingly, the image signal having an input level above the reference point becomes brighter or darker in accordance with the adjusted luminance curve.

In the above-described embodiment, the reference point selection icons are limited to three in the ideal luminance graph, but the number of reference points may be variously provided.

In the above-described embodiment, the present invention has been described as being applied to an LCD monitor. However, the luminance adjusting unit according to the present invention may be provided in a CRT monitor receiving a digital signal to process the gamma-corrected image signal in the luminance adjusting unit.

By such a configuration, when adjusting the brightness of the video signal, the brightness can be adjusted for each area by dividing into a plurality of areas according to the input level of the video signal.

As described above, according to the present invention, a display apparatus capable of adjusting the luminance of an image signal corresponding to a desired signal region by dividing the video signal into a plurality of regions according to the input level of the video signal and adjusting the input level of the video signal for each region; The brightness adjustment method is provided.

Claims (11)

In the display device having a signal processing unit for processing a video signal, Brightness adjustment selector, A brightness adjusting unit for changing the digital level of the video signal; And a controller controlling the luminance adjusting unit to divide the input level into at least two regions according to the digital input level of the video signal based on the selection of the luminance adjusting selector, and adjust the input level for each region to provide the signal processing unit. Display device characterized in that. The method of claim 1, And the brightness adjusting unit includes a memory in which a video signal level changing table is stored, and outputs a video signal whose digital level is changed based on the video signal changing table according to the change information provided from the control unit. The method of claim 1, The brightness adjustment selector includes an OSD selector, And the controller is further configured to display a brightness adjustment screen for adjusting brightness by dividing the display into a plurality of areas according to an input level of the digital video signal according to selection of the OSD selection unit. The method of claim 3, The luminance adjustment screen includes a reference point selection screen for dividing the input level into a plurality of areas, a reference point abnormality adjustment screen for adjusting an input level of a video signal above the reference point, and the reference point based on a reference point selected on the reference point selection screen. And an adjustment screen below a reference point for adjusting the input level of the following video signal. The method of claim 4, wherein And the reference point selection screen includes at least one reference point selection icon. The method of claim 5, And the adjustment screen below the reference point and the adjustment screen above the reference point include a plurality of adjustment icons for adjusting an input level of a video signal below the reference point. In the brightness adjustment method of the display device, Presenting a reference point selection screen provided with a luminance curve; Selecting at least one reference point for dividing into a plurality of areas according to an input size of the video signal in the luminance curve; Selecting at least one of a video signal above the reference point and a video signal below the reference point; Adjusting an input level of a video signal corresponding to the selected signal region; And processing the video signal whose input level is adjusted and displaying the picture as an image. The method of claim 7, wherein And presenting a brightness adjustment screen for respectively adjusting brightness of the video signal above the reference point and the video signal below the reference point. The method of claim 8, The luminance adjustment screen includes a reference point selection screen for dividing the input level into a plurality of areas, a reference point abnormality adjustment screen for adjusting an input level of a video signal above the reference point, and the reference point based on a reference point selected on the reference point selection screen. And an adjustment screen below a reference point for adjusting the input level of the following video signal. The method of claim 9, And the reference point selection screen includes at least one reference point selection icon. The method of claim 10, And the adjustment screen below the reference point and the adjustment screen above the reference point include a plurality of adjustment icons for adjusting an input level of a video signal below the reference point.