KR20070063225A - (white balance control method of image display device and apparatus thereof - Google Patents

Abstract

An apparatus and a method for controlling white balance of an image display apparatus are provided to maintain consistent white balance by installing a CCD(Charge Coupled Device) for detecting an RGB(Red, Green and Blue) value of an image displayed on a display part and comparing the detected RGB value with an RGB value outputted to the display part. It is determined whether an automatic white balance control function is selected(S10). If the automatic white balance control function is selected, a highlight white pattern is displayed(S12). An RGB value of an image inputted through a sensing device is measured(S14). The measured RGB value is compared with an RGB value of the displayed highlight white pattern(S16). A gain of the RGB value of the highlight white pattern is controlled if the two compared RGB values are not equal to each other(S18). A low-light white pattern is displayed if the two compared RGB values are equal to each other(S20). An RGB value of an image inputted through the sensing device is measured(S22). The measured RGB value is compared with an RGB value of the displayed low-light white pattern(S24).

Description

WHITE BALANCE CONTROL METHOD OF IMAGE DISPLAY DEVICE AND APPARATUS THEREOF}

FIG. 1 is a diagram schematically illustrating a general image display apparatus. Referring to FIG.

FIG. 2 is a block diagram schematically illustrating a white balance adjusting apparatus of an image display apparatus according to the present invention.

Figure 3 is an exemplary view showing the installation state of the sensing element in the white balance adjustment device of the image display apparatus according to the present invention.

4 is a flowchart illustrating a method of adjusting white balance of an image display apparatus according to the present invention.

   -Explanation of symbols for the main parts of the drawings-

1 plasma display panel 2 control unit

2a: Analog-to-digital converter 3, 3 ': address driver

4, 5: first and second sustain drive unit

10: sensing element

20: correction unit

The present invention relates to a method for adjusting white balance of an image display apparatus and a device thereof. More particularly, a CCD device for detecting RGB values of an image to be displayed on a display unit of an image display apparatus is provided, and the display unit is provided with respect to a white image. The present invention relates to a method of adjusting a white balance of an image display apparatus and a device for adjusting a white balance by correcting an RGB value when a difference occurs by comparing an output RGB value with a detected RGB value.

As the modern society is called the information society, the importance of the display device is increasing with the development and spread of the information processing system, and the types thereof are gradually diversifying.

CRT (Cathode Ray Tube), which has been used most often as a display device, has various problems such as large size, high operating voltage, and distortion of display. Recently, research and development of various flat panel display devices having a matrix structure have been actively progressed because they are not suitable.

In other words, the flat panel display device has a matrix structure, which displays a stable image without display distortion and color bleeding, and has a flat structure, is thin, and has a low operating voltage. It can be applied to the field.

Among such flat panel display devices, a device including a plasma display panel which is a light emitting device and displaying a moving image or a still image by using a gas discharge phenomenon inside the plasma display panel is called a plasma display device.

FIG. 1 is a diagram schematically illustrating a general image display apparatus. Referring to FIG.

The image display apparatus shown here includes a plasma display panel (1) in which an address electrode and first and second sustain electrodes are formed; An analog / digital converter (2a) that receives and digitizes the analog image data of RGB and outputs the digitized signal, and outputs first and second emission sustain pulses and various control signals to be supplied to the first and second sustain electrodes according to the input signal, respectively. A control unit 2 for generating and outputting; An address driver (3, 3 ') for supplying digitized RGB image data (gradation data) output from the analog-to-digital converter (2a) to the address electrode in accordance with a control signal; And first and second sustain drivers 4 and 5 for supplying the first and second emission sustain pulses to the first and second sustain electrodes, respectively, in accordance with the control signal.

A method of displaying a moving picture and a still picture by the subfield method in the plasma display device configured as described above is as follows.

First, the control unit 2 and the first and second sustain drivers 4 and 5 supply specific pulses to the first and second sustain electrodes so that each cell of the plasma display panel 1 is not affected by the previous light emission state. After all the cells have been discharged, the first sustain driver 4 supplies a line scan pulse to the first sustain electrode while the address drivers 3 and 3 'digitize RGB image data of the corresponding line to the address electrode. One bit is supplied to light a specific cell supplied with 1 (high pulse) as a bit value.

Subsequently, when the control unit 2 and the first and second sustain drivers 4 and 5 supply the number of emission sustain pulses corresponding to the first subfield to the first and second sustain electrodes, light emission of a specific cell is performed in the first subfield. One frame of image is displayed on the plasma display panel 1 when the discharge erasing step, the image data supplying step, and the emission sustain pulse supplying step are repeatedly performed for the remaining subfields for the corresponding time of the field. .

In addition, an appropriate amount of RGB cells emitted in an appropriate amount according to the image data of the digitized RGB (consisting of the same number of bits as the number of subfields) supplied to any one pixel, that is, an address electrode of three cells of RGB during the period of one frame Various colors are realized in any one pixel by a combination of, blue and green visible light.

In other words, when the same image data (gradation data) is supplied to each of the RGB cells constituting one pixel, theoretically white (achromatic color) is realized, and when different image data is supplied, various colors are realized according to the ratio of the amount of emission of each of the RGB cells do.

On the other hand, when the plasma display device is deteriorated due to deterioration due to long-term use or for various other reasons, the accurate color of the image data may not be realized on the plasma display panel 1.

Accordingly, although not shown in the prior art, a plurality of white balance correction address electrodes are additionally formed on the plasma display panel such that address electrodes of the plasma display panel, that is, separate white balance correction address lines correspond to each address line. When the white balance was adjusted, separate RGB correction data was supplied to each of the white balance correction address electrodes.

In order to obtain the correction data of the RGB for white balance correction, it is possible to determine the difference between the setting value and the detection value by using a specific measuring instrument. There is a problem that is not implemented.

The present invention was created to solve the above problems, and an object of the present invention is to install a CCD element for detecting the RGB value of the image displayed on the display unit of the image display device and output to the display unit for the white image The present invention provides a method of adjusting a white balance of an image display apparatus and a device for adjusting a white balance by correcting an RGB value when a difference occurs by comparing an RGB value with a detected RGB value.

White balance adjustment method of the image display apparatus according to the present invention for achieving the above object is a first step of determining whether the automatic white balance adjustment function is selected, and a high light when the automatic white balance adjustment function is selected in the first step A second step of displaying a white pattern, a third step of measuring a RGB value of an image input through the sensing element after displaying the high light white pattern in a second step, and an RGB value and display measured in the third step The fourth step of comparing the RGB values of one high light white pattern, and if the comparison result is not the same in the fourth step, after adjusting the gain of the RGB values of the high light white pattern, the method returns to the second step and returns the high light white pattern. A fifth step of displaying a low light white pattern if the display is the same; A sixth step of measuring the RGB value of the image input through the sensing element after displaying the low light white pattern in the system; and comparing the RGB value measured in the sixth step with the RGB value of the displayed low light white pattern. If the comparison result in step 7 and step 7 is not the same, after adjusting the bias of the RGB value of the low light white pattern, the method returns to step 5 to display the low light white pattern, and if it is the same, terminating the white balance adjustment. Characterized by consisting of eight steps.

In the present invention, the high light white pattern is an 80% white pattern, and the RGB value is 204: 204: 204.

In the present invention, the low light white pattern is a 40% white pattern, characterized in that the RGB value is 102: 102: 102.

In addition, a white balance adjusting apparatus of an image display apparatus according to the present invention is a video display apparatus for digitizing RGB image data to display on a display, comprising: a sensing element for measuring an RGB value of an image displayed on a display unit, and And a correction unit for generating and outputting correction data by comparing the RGB values measured by the device with the RGB values output to the display unit.

In the present invention, the sensing element is installed on the front of the image display device is characterized in that it is installed to receive the image displayed by the reflecting mechanism.

At this time, the sensing device is characterized in that the CCD device.

The present invention thus achieved measures the RGB value of the image displayed through the sensing element for measuring the RGB value of the image displayed on the image display apparatus, and compares it with the RGB value of the image data output to the display unit. By adjusting the gain or bias of the RGB value of the output image data, the white balance can be easily adjusted.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the present embodiment is not intended to limit the scope of the present invention, but is presented by way of example only and the same parts as in the conventional configuration using the same reference numerals and names.

FIG. 2 is a block diagram schematically illustrating a white balance adjusting apparatus of an image display apparatus according to the present invention.

The image display device shown here includes a plasma display panel (1) having an address electrode and first and second sustain electrodes formed thereon as a plasma display device; An analog / digital converter (2a) that receives and digitizes the analog image data of RGB and outputs the digitized signal, and outputs first and second emission sustain pulses and various control signals to be supplied to the first and second sustain electrodes according to the input signal, respectively. A control unit 2 for generating and outputting; An address driver (3, 3 ') for supplying digitized RGB image data (gradation data) output from the analog-to-digital converter (2a) to the address electrode in accordance with a control signal; And first and second sustain drivers 4 and 5 for supplying the first and second emission sustain pulses to the first and second sustain electrodes, respectively, in accordance with the control signal.

In addition, the sensing element 10 of the CCD element for measuring the RGB value of the image displayed on the plasma display panel 1 for white balance adjustment, the RGB value measured by the sensing element 10 and the control unit 2 And a correction unit 20 for generating correction data by comparing the RGB values of the output image data with each other and outputting the correction data to the control unit 2.

In this case, as illustrated in FIG. 3, the sensing element is installed in front of the image display apparatus and is configured to receive an image displayed by a reflector when measuring the RGB value of the image displayed for white balance adjustment.

Therefore, when the white balance is to be adjusted, the image display apparatus outputs a white pattern as a reference and measures the RGB value of the output image through the sensing element 10 and compares it with the RGB value of the output image data. This allows the white balance to be adjusted automatically.

This will be described with reference to a flowchart for explaining a white balance adjusting method of an image display apparatus according to the present invention shown in FIG.

First, it is determined whether a function for automatic white balance adjustment is selected.

In this case, when the automatic white balance adjustment function is selected, a high light white pattern, which is an 80% white pattern, is output to the plasma display panel 1.

The RGB light of the image displayed on the panel 1 is measured by inputting the high light white pattern output to the panel 1 to the CCD element, which is the sensing element 10, by using a reflecting mechanism (not shown).

In this way, if the RGB values 204: 204: 204, which are outputted to the panel 1, are compared with the measured RGB values, the white balance is distorted, and after adjusting the RGB gain of the other part, the 80% white pattern is again displayed. Print out 1) and repeat the above process.

Thus, when the RGB value output to the panel 1 and the RGB value measured through the sensing element 10 are the same, a low light white pattern, which is a 40% white pattern, is output.

The RGB value of the image displayed on the panel 1 is measured by inputting the low light white pattern output to the panel 1 to the CCD element, which is a sensing element, by using a reflector (not shown).

In this way, if the RGB values 102: 102: 102, which are output to the panel 1, are compared with the measured RGB values, the white balance is not corrected. If the above process is repeated with 1) output, the automatic white balance adjustment is terminated.

When outputting the high light white pattern and the low light white pattern, the measured RGB value and the output RGB value are compared with each other, and if a difference occurs, the gain or bias of the difference RGB value is adjusted. By adjusting the white balance, the user can adjust the white balance simply by activating the automatic white balance function, even if there is no separate measuring device.

As described above, the present invention provides a CCD device for detecting the RGB value of the image displayed on the display unit of the image display apparatus, and compares the RGB value outputted to the display unit with the detected RGB value with respect to the white image. When it occurs, it is possible to adjust the white balance by correcting the RGB value, but it has the advantage of maintaining a constant white balance at all times by simply adjusting the white balance.

Claims (6)

The first step of determining whether the automatic white balance adjustment function is selected, A second step of displaying a high light white pattern when the automatic white balance adjustment function is selected in the first step; A third step of measuring an RGB value of an image input through a sensing device after displaying the high light white pattern in the second step; A fourth step of comparing the RGB value measured in the third step with the RGB value of the displayed high light white pattern; If it is not the same as a result of the comparison in the fourth step, after adjusting the gain of the RGB value of the high light white pattern, the display returns to the second step to display the high light white pattern and, if the same, to display the low light white pattern. The fifth step, A sixth step of measuring an RGB value of an image input through the sensing device after displaying the low light white pattern in the fifth step; A seventh step of comparing the RGB value measured in the sixth step with the RGB value of the displayed low light white pattern; If it is not the same as a result of the comparison in the seventh step, after adjusting the bias of the RGB value of the low light white pattern, the process returns to the fifth step to display the low light white pattern and, if the same, ends the white balance adjustment. 8 levels White balance adjustment method of the image display device comprising a. The method of claim 1, wherein the high light white pattern is an 80% white pattern and has an RGB value of 204: 204: 204. The method of claim 1, wherein the low light white pattern is a 40% white pattern and has an RGB value of 102: 102: 102. A video display apparatus for digitizing RGB image data to display on a display unit, A sensing element for measuring the RGB value of the image displayed on the display unit; A compensator for generating and outputting correction data by comparing the RGB values measured by the sensing element with the RGB values output to the display unit. White balance adjustment device of the video display device, characterized in that further comprises. 5. The apparatus of claim 4, wherein the sensing element is installed in front of the image display apparatus to receive an image displayed by a reflecting mechanism. 6. The apparatus of claim 4 or 5, wherein the sensing element is a CCD element.

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