KR200435609Y1 - Apparatus for optimizing color-temperature or brightness automatically - Google Patents

Abstract

The present invention relates to a device for automatically compensating for color temperature or luminance, and compensating for at least one of color temperature and luminance of a display apparatus by receiving feedback of RGB cathode current of a video driver. An apparatus, comprising: signal generating means for generating a highlight signal for color temperature or luminance compensation under the control of a control means to detect a change in voltage level of a display device; Signal measuring means for measuring a feedback current of the display device according to a change in voltage level under the control of the control means; Storage means for storing color temperature or luminance compensation data; And comparing the measured current (measured value) with the data (reference value) and generating a cut-off voltage and gain adjustment control signal based thereon, thereby compensating for the color temperature or luminance of the display device. Control means.

Color Temperature, Luminance, Auto Compensation, CRT, Display

Description

Apparatus for optimizing color-temperature or brightness automatically}

1 is a block diagram of a conventional color temperature and luminance compensation device.

2 is an overall configuration diagram of an embodiment of an automatic color temperature or luminance compensation device according to the present invention.

3 is a detailed configuration diagram of an embodiment of an automatic color temperature or luminance compensation device according to the present invention.

4 is a diagram illustrating an embodiment of a color temperature or luminance compensation signal used in the present invention.

5 is a flowchart illustrating an embodiment of a color temperature compensation process of an automatic color temperature or luminance compensation device according to the present invention.

6 is a flowchart illustrating a luminance compensation process of an automatic color temperature or luminance automatic compensation device according to the present invention.

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

11: Pre-Amp 12: Video Driver

13: display device (CRT) 21: control unit (MCU)

22: storage unit (EEPROM) 23: highlight signal generator

24 cathode current feedback unit 25 cut-off voltage control unit

231: highlight signal modulation circuit 241: highlight signal demodulation circuit

242: Multiplexer (MUX) 243: A / D converter

The present invention relates to an automatic color temperature or luminance automatic compensation device, and in particular, changes in the characteristics of the CRT by automatically compensating (optimizing) the color temperature or brightness of an image display device such as a medical CRT (Cathod Ray Tube) monitor. The present invention relates to a device capable of automatically compensating for a change in color temperature or luminance according to the present invention.

In general, an image display apparatus refers to an apparatus for displaying information on a display screen of information among various peripheral apparatuses that process information generated from a main apparatus, that is, a computer main body, in a system apparatus for handling information.

As an example of such an image display apparatus, an image is reproduced by emitting a phosphor in front of the CRT by an electron beam controlled by an image signal using a CRT.

However, color temperature, brightness, and the like are factors that have a great influence on the color of the image display apparatus.

Color temperature can be referred to as the luminance ratio of red, green, and blue, and the brightness of one or more of these three colors becomes higher or lower and the same white and reddish color. It gives a bluish feeling. That is, as the luminance ratio of Red increases, the color coordinates of white move toward Red, and in the opposite case, the color coordinates move toward Blue. Thus, by measuring the color coordinates of white, it is possible to grasp the difference in the overall color tone of the monitor.

This white color coordinate measurement is possible by measuring the current flowing through the monitor, which can adjust the cut-off voltage (for example, by changing the bias voltage of the RGB electron gun) to compensate for the color temperature or luminance. will be.

A color temperature and luminance compensation apparatus according to the related art of the image display apparatus will be described with reference to FIG. 1.

As shown in FIG. 1, in processing and displaying a red and blue (RGB) signal, a conventional color temperature and luminance compensator preamplifies an output (RGB signal processing) output from a video driver 12. (Pre-Amp) 11 receives the feedback (FeedBack) to simply compensate for the color temperature and brightness. That is, the preamplifier 11 has a function of a natural color correction circuit (AKB), and compensates the color (color temperature and luminance) by receiving a signal from the video driver 12 and the like.

However, if the aging of the CRT and other components occurs as the display device (CRT Monitor) 13 is used for a long time, the color temperature and luminance (the color temperature) of the display device 13 having the display function according to the RGB signal processing There is a limit to compensating brightness. Also, if the Back Raster is dark, you will not be able to compensate. Accordingly, an image display device such as a medical device requires an apparatus capable of compensating color temperature or luminance more quickly and accurately. In addition, compensation should be made when the back luminance, that is, the back raster is cut off.

The present invention has been proposed to meet the above requirements, and automatically compensates (optimizes) the color temperature or brightness in a video display device such as a medical CRT (Cathod Ray Tube) monitor, and optimizes the reference luminance. It is an object of the present invention to provide a device that can automatically compensate for color temperature or luminance regardless of the setting of (Base Brightness) value.

The objects of the present invention are not limited to the above-mentioned purposes, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention for achieving the above object, in the device for compensating at least one of the color temperature and the brightness of the display device by receiving a feedback (Red) Cathode Current (RGB) cathode current of the video driver (Video Driver) Signal generation means for detecting a change in voltage level of the display device by generating a highlight signal for color temperature or luminance compensation under the control of the control means; Signal measuring means for measuring a feedback current of the display device according to a change in voltage level under the control of the control means; Storage means for storing color temperature or luminance compensation data; And comparing the measured current (measured value) with the data (reference value) and generating a cut-off voltage and gain adjustment control signal based thereon, thereby compensating for the color temperature or luminance of the display device. Characterized in that it comprises a control means.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, only the embodiments of the present invention to make the disclosure of the present invention is complete and common knowledge in the art to which the present invention belongs It is provided to fully inform the person having a scope of the invention, the invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

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

2 and 3 show the configuration of an embodiment of the automatic color temperature or luminance compensation device according to the present invention.

As shown in FIG. 2, the color temperature or luminance automatic compensation device according to the present invention receives a feedback of an RGB cathode current of a video driver 12 and receives a feedback (FeedBack) to the display device (CRT) 13. In the apparatus for compensating at least one of the color temperature and the luminance of the display panel (see FIG. 1), under the control of the control unit MCU 21, a highlight signal for compensating for the color temperature or the luminance is generated to generate a display device. Under the control of the highlight signal generator 23 and the control unit MCU 21 for detecting a change in the voltage level of the CRT 13, the display device CRT ( A cathode current feedback unit 24 for measuring the feedback current of the circuit 13, and a storage unit (EEPROM: Electrically Erasable PROM) 22 storing compensation data of at least one of color temperature and luminance. With measured The flow rate (measured value) is compared with the data (reference value), and based on this, the cut-off voltage and gain adjustment control signal (Bias / Gain of the RGB red electron gun is changed to change the color temperature. And the cut-off voltage control unit 25 and the preamplifier 11 to generate at least one of the control unit (MCU) 21 to correct at least one of the luminance and the luminance. And a controller (MCU: Micro Controller Unit) 21 for compensating for color temperature or luminance.

Here, the highlight signal for color temperature or luminance compensation is blanking (or a signal for vertical synchronization of the display device (CRT) 13) as shown in FIG. 4. It is added to the back porch area, and the control unit (MCU) 21 sends a trigger signal to the highlight signal generator 23 in accordance with the vertical synchronization to generate it. That is, the highlight signal generator 23 receives a trigger signal from the control unit MCU 21 so as to measure the current of the display apparatus CRT 13 and receives a highlight signal from the display device crt ( 13) to send. Therefore, the highlight signal generator 23 generates a compensation highlight signal of at least one of the color temperature and the luminance, so that the color temperature even when the display device (CRT) 13 is low brightness (ie, dark). And change in luminance. This may be particularly useful for medical display Cathode Ray Tubes (CRTs) that use a low base luminance (using Low Brightness).

In addition, as illustrated in FIG. 3, the cathode current feedback unit 24 includes a highlight signal demodulation circuit 241 for demodulating the feedback current of the display device 13 according to the voltage level change, and Under the control of the control unit (MCU) 21, a multiplexer (MUX) 242 for selecting each red cyan (RGB) channel and an analog demodulation signal of the selected corresponding video channel are converted into a digital signal to control the control unit (MCU). It consists of an analog / digital converter (A / D Converter) 243 to the (21).

Accordingly, the control unit (MCU) 21 compares the measured value with the reference value, and based on this, a control signal (Bias of the RGB red electron gun) for adjusting the cut-off voltage and the gain. ) Is generated to the cutoff voltage control unit 25 and the preamplifier 11 to change at least one of the color temperature and the luminance to change the gain. The cutoff voltage control unit 25 and the preamplifier 11 are controlled to increase the bias / gain and to reduce the bias / gain if the measured value is larger than the reference value.

As such, the controller 21 may compensate the color temperature or the luminance of the display device 13 more quickly and automatically. To this end, the color temperature or the luminance compensation algorithm of FIG. 5 and FIG. 21, data (reference values) used for color temperature or luminance compensation are optimized by an automatic adjustment program and stored in a storage unit (EEPROM) 22.

Then, the operation of each component of the color temperature or luminance automatic compensation device according to the present invention having the above configuration will be described in more detail.

First, an arbitrary signal is placed in a blanking (or back porch) region of the vertical synchronization signal to generate a signal (a compensation signal for at least one of color temperature and luminance) for detecting a current flowing through the display device (CRT) 13. Add. This causes the control unit (MCU) 21 to send a trigger signal to the highlight signal modulation circuit (highlight signal generator 23 in FIG. 1) 231 in accordance with vertical synchronization.

The highlight signal modulation circuit (highlight signal generators 23 and 231) receives a signal from the controller 21 and applies a high voltage to the G1 terminal of the display device (CRT) 13. Then, a white line appears at the top (not visible when the vertical size is normal) of the display device (CRT) 13 (this is called 'Highlight'), and the current that can be measured by the display device (CRT) 13 is measured. Flows.

As such, when the highlight signal modulation circuit 231 generates a highlight signal, a measurable current flows in the display device (CRT) 13, and the highlight signal demodulation circuit of the cathode current feedback unit 24 flows. The furnace 241 demodulates the signal so that it can be measured.

At this time, the control unit (MCU) 21 controls the multiplexer (MUX: Multiplexer) 242 to select each RGB channel, and read the value of the A / D converter (243).

Thereafter, the control unit (MCU) 21 reads the optimized value (reference value) from the storage unit (EEPROM) 22 to compensate for the color temperature or the luminance by using a compensation algorithm. In this case, when the measured value is smaller than the reference value, the bias / gain is increased, and when the measured value is larger than the reference value, the cutoff voltage controller 25 and the preamplifier 11 are controlled to reduce the bias / gain. Cut-off voltage and gain adjustment control signal (command control signal for correcting color temperature or brightness by changing bias / gain of RGB green electron gun) cutoff voltage controller 25 And the preamplifier 11.

Then, referring to FIG. 5, the color temperature compensation algorithm driven by the control unit (MCU) 21 is first checked whether it is a highlight section (current measurement section) (501). The value entered at 243 is read (502), and the measured value (measured value) is compared with the reference value (503). At this time, the storage unit (EEPROM) 22 stores the reference value (bias voltage) for each RGB used in color temperature compensation by the automatic adjustment program.

As a result of the comparison, when the measured value is smaller than the reference value, the bias is increased (504), and when it is large, the bias is reduced (505). Thereafter, the corresponding RGB channel is selected to transmit a bias (506).

By transmitting the cutoff voltage adjustment control signal to the cutoff voltage controller 25, the color temperature may be corrected by changing the bias voltage of the red and green (RGB) electron gun.

Meanwhile, referring to FIG. 6, a luminance compensation algorithm driven by the control unit (MCU) 21 is first checked by checking whether an AGC (Auto Gain Control) section (current measurement section) is performed (601). The value input to the D converter 243 is read (602), and the measured value (measured value) is compared with the reference value (603). At this time, the storage unit (EEPROM) 22 optimizes and stores the reference value (gain) for each RGB used for luminance compensation by an automatic adjustment program.

Here, the AGC (Auto Gain Control), the display device (CRT) 13 is output on the assumption that all the video (video) input has passed. However, in practice, there are some gain differences between systems, so white may look different. It is a function to correct the difference of input by automatic correction.

As a result of the comparison, the gain is increased when the measured value is smaller than the reference value (604), and the gain is decreased (605) when the measurement value is larger. Thereafter, the corresponding RGB channel is selected to deliver a gain (606).

By transmitting the video gain adjustment control signal to the preamplifier 11, it is possible to correct the luminance by changing the gain of the red and green (RGB) electron gun.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may realize the present invention in other specific forms without changing its technical spirit or essential features. I can understand that. Therefore, the embodiments described above are to be understood in all respects as illustrative and not restrictive.

According to the present invention as described above, even if the aging of the CRT (Cathode Ray Tube) and other components occurs as the video display device is used for a long time, the color temperature or brightness of the monitor screen is quickly and accurately controlled by the control unit. It has the effect of automatically compensating (optimizing) (fast response and accuracy).

Claims (7)

An apparatus for compensating at least one of a color temperature and a luminance of a display device by receiving feedback of a red cathode (CGB) cathode current of a video driver. Signal generation means for generating a color signal or luminance compensation highlight signal under the control of the control means to detect a change in the voltage level of the display device; Signal measuring means for measuring a feedback current of the display device according to a change in voltage level under the control of the control means; Storage means for storing color temperature or luminance compensation data; And The control for compensating for the color temperature or luminance of the display device by comparing the measured current (measured value) with the data (reference value) and generating a cut-off voltage and gain adjustment control signal based thereon. Way Color temperature or luminance automatic compensation device comprising a. The method of claim 1, The signal generating means, And generating a highlight signal for the color temperature or luminance compensation, so that the display apparatus can detect a change in luminance even when the display apparatus is low brightness (that is, even when it is dark). The method of claim 2, The color temperature or luminance compensation highlight signal, A color temperature characterized by being added to a blanking (or back porch) region of the vertical synchronization signal, wherein the control means sends a trigger signal to the signal generating means in accordance with vertical synchronization to generate the color temperature. Or luminance automatic compensation device. The method of claim 1, The cutoff voltage and gain adjustment control signal, And a command control signal of said control means for correcting color temperature / luminance by changing a bias / gain voltage of a red-green-blue electron gun. The method according to any one of claims 1 to 4, The signal measuring means, Demodulation means for demodulating the feedback current of the display device in response to a change in voltage level; Channel selection means for selecting each red cyan (RGB) channel under the control of the control means; And Analog-to-digital conversion means for converting the analog demodulation signal of the selected video channel to a digital signal, and transmits it to the control means Color temperature or luminance automatic compensation device comprising a. The method of claim 5, The control means, The digital demodulation signal (measurement value) of the corresponding video channel transmitted from the analog / digital converting means is compared with at least one compensation data (reference value) of color temperature and luminance stored in the storage means, The cutoff voltage and gain adjustment control signals for the control command to increase the bias / gain if the reference value is smaller than the reference value and to decrease the bias / gain if the measured value is larger than the reference value are controlled by the cutoff voltage controller and the free signal. Color temperature or luminance automatic compensation device characterized in that the transmission to the amplifier. The method of claim 6, The display device, A color temperature or luminance automatic compensation device, characterized in that the medical display CRT (Cathod Ray Tube) used to darken the brightness.

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