KR100461462B1 - Display device having a function of white-washing and method thereof - Google Patents

Abstract

The present invention relates to a method for removing a screen afterimage of a video display device. The afterimage removal method may include: setting a sequence of sequential operation modes for removing afterimages, inputting a command to perform an afterimage removal function, blocking an output of an input image signal from a memory unit, And sequentially performing the preset sequential operation mode to remove the afterimage of the screen, and displaying the normally input image when the preset sequential operation mode is completed.

By the method of removing the afterimage of the screen according to the present invention, it is possible to prevent a phenomenon in which the product is heated or an increase in power consumption during the afterimage removal period.

Description

DISPLAY DEVICE HAVING A FUNCTION OF WHITE-WASHING AND METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of removing after-images of a video display device, and more particularly, to a method of removing after-images of a screen by varying signal output levels at regular time intervals using a timer.

1 is a block diagram schematically illustrating an internal configuration of a general video display device. Hereinafter, a configuration of an image display device will be described with reference to FIG. 1.

As illustrated in FIG. 1, the image display device may include a signal input unit 100 for converting various image signals input from the outside into a form of a suitable signal in a display device, and resolution of the image signal transmitted from the signal input unit 100. A scaler 110 for converting to match the resolution of the display unit, a microcontroller 120 for controlling the overall operation, a memory 130 for storing image signals or data, a picture-in-picture (PIP) function or an OSD The overlay controller 140 supports a function, and a display device 150 such as an LCD or a PDP.

Various video signals are inputted from the outside through the signal input unit 100 and the input video signals are converted into a form of a signal that can be processed by the video display device and outputted. When the input video signal is an analog signal, an ADC (Analog to Digital Converter) converts to digital signal, DVI (Digital Video Interface) signal is converted through TMDS (Transition Minimized Differential Signaling) receiver, and NTSC or PAL broadcast signal through TV decoder The broadcast signal of the HDTV is converted by the MPEG2 converter.

The image signals converted through the signal input unit 100 are converted in accordance with the resolution of the display device unit 150 by the signal processing unit including the scaler 110 and the like, and displayed on the display device unit 150.

Meanwhile, under the control of the microcontroller 120, the image signals output from the scaler 110 implement the PIP or OSD function on the screen by using the memory unit 130 and the overlay controller 140.

At this time, an image display device using a PDP may cause an image sticking phenomenon when a certain level of signal data is scanned over the same pixel over a long period of time by a still image or a screen freezing function.

The image display device provides a white wash function for removing the afterimage phenomenon as described above. 2 is a flowchart sequentially illustrating a process of removing a screen afterimage according to the related art.

Hereinafter, the afterimage removal process according to the related art will be described with reference to FIG. 2.

First, when a fixed signal is input for a long time, such as a pattern fixed to a video display device or a logo in a video, and after-image occurrence occurs, the user turns on the White Wash function to remove the after-image. (ON) (step 200). When the afterimage removal function is turned on, the memory unit is disabled to block the image signal input from the outside from being displayed on the screen (step 210) and to output the R, G, and B image signals through the overlay controller. By setting the gain to the maximum value FFh and outputting it (step 220), a white pattern is displayed on the screen.

Next, the white pattern is continuously displayed on the screen until a completion signal is input from the user to complete the screen afterimage removal function.

When the completion signal for completing the afterimage removal function is input from the user (step 230), the memory unit is operated normally so that the video signal input from the outside is normally displayed on the screen (step 240). The output gain for the signal is set to the minimum value (00h) and output (step 250) to return to the original screen.

Fig. 3 is a waveform diagram of analog analysis of output signals of R, G, and B video signals while the screen afterimage removal function is executed according to the conventional technique described above. As shown in FIG. 3, it can be seen that in the afterimage removal section in which the afterimage removal function is executed, the output values of the R, G, and B image signals are all maximum values FFh.

However, the afterimage removal method according to the related art continuously outputs the maximum output value until the user inputs the completion signal, thereby consuming the maximum power of the video display device for a long time, and the power consumption is continuously increased. As a result, there is a problem that occurs due to overheating of the product and heat generation phenomenon due to the overheating of the product or adversely affect the reliability of the product.

An object of the present invention for solving the above-mentioned problems is to provide a method for removing the afterimage of the screen, the power consumption is not high in the image display device.

1 is a block diagram schematically illustrating an internal configuration of a general video display device.

2 is a flowchart sequentially illustrating a method of removing an afterimage of a screen according to the related art.

3 is a waveform diagram of R, G, and B image signals outputted during a screen afterimage removal period according to the related art.

4 is a flowchart sequentially showing a method of removing an afterimage of a screen according to the present invention;

FIG. 5 is a diagram illustrating an embodiment of a sequential operation mode set by a method of removing afterimages according to the present invention; FIG.

6 is a waveform diagram of an R, G, B image signal output during an afterimage removal period according to the present invention;

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

100: signal input unit

110: scaler

120: microcontroller

130: memory unit

140: overlay control

150: display device

According to an aspect of the present invention, there is provided a method of removing a residual image in a video display device, the method comprising: setting a sequential operation mode for removing a residual image, and receiving a command for performing a residual image removal function; Step of blocking the output of the input image signal from the memory unit, executing the after-sequence of the predetermined sequential operation mode to sequentially remove the afterimage, when the sequential operation mode is completed, displays the normally input image It comprises the step of.

In this case, the sequential operation mode is performed at least once, and sets an output gain value for the R, G, and B video signals according to each operation mode, and the first operation mode is the R, G, and B video signals for a predetermined time. It is desirable to set the output gain to the maximum value and output the result.

According to another aspect of the present invention, an image display device having an afterimage removal function includes a memory unit and an afterimage removal function, in which output gain values of R, G, and B image signals are preset for at least one sequential operation mode; As requested, the microcomputer reads the sequential operation modes stored in the memory unit and outputs R, G, and B image signals according to the output gain values of the read sequential operation modes, and sequentially executes each sequential operation mode. It has a controller.

In this case, in the first sequential operation mode of the at least one sequential operation mode, it is preferable that the output gain values of the R, G, and B image signals have a maximum value.

By the method of removing the afterimage of the screen according to the present invention, it is possible to prevent a phenomenon in which the product is heated or an increase in power consumption during the afterimage removal period.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. First, in adding reference numerals to the components of each drawing, it should be noted that the same components are denoted by the same reference numerals as much as possible, even if displayed on different drawings.

Hereinafter, a method of removing afterimages of the screen of the video display device according to the present invention will be described in detail with reference to FIGS. 4 to 6. In particular, it is preferable that the afterimage removing method according to the present invention is applied to a video display device using a PDP panel.

4 is a flowchart sequentially illustrating a method of removing afterimages according to the present invention, and FIG. 5 is a diagram illustrating an exemplary embodiment of a sequential operation mode used in the afterimage removal method according to the present invention.

Referring to FIG. 4, first, the sequential operation modes for the afterimage removal function are preset and stored (step 400). It is preferable that the sequential operation mode is made at least once, and as shown in FIG. 5, the sequential operation mode includes N circuits in the embodiment of FIG. 5. Then, the output gain values for the R, G, and B video signals according to the operation modes are set. In this case, it is preferable to set the output gain values for the R, G, and B video signals to the maximum value (= FFh) in the first operation mode. When the setting operation for the sequential operation mode is completed, it is stored.

Next, if a screen afterimage removal function is requested (step 410), the screen afterimage removal function according to the present invention is executed. In this case, the afterimage removal function may be requested from the user through a remote controller or a key input, or may be generated at a preset time in the image display device. That is, by setting the data variable period in the video display device in advance, when the same video signal is input for a predetermined time, the microcontroller in the video display device can execute the afterimage removal function according to the preset data variable period. have. For example, when the same video signal is input for 6 hours or more, the data variable period is set to 2 hours in advance, so that the corresponding video display device performs screen afterimage removal every 2 hours.

As the afterimage removal function is requested, the memory unit is disabled to block the image signal input from the outside from being displayed on the screen (step 420). Next, the screen afterimage removal function is executed by sequentially changing the output gain values of the R, G, and B video signals according to the preset sequential operation mode (step 430). A process of sequentially removing the afterimages according to the sequential operation mode will be described with reference to FIG. 5. As shown in FIG. 5, first, the output gain of the R video signal is FFh, the output gain of the G video signal is FFh, and the output gain of the B video signal is FFh, according to the set data of n = 0. Set each one and output the corresponding video signal on the screen for a certain time. Next, according to the set data of n = 1, the output gain for the R video signal is set to AAh, the output gain for the G video signal to CCh, and the output gain for the B video signal to AAh, respectively. Output the corresponding video signal on the screen. This process is repeated up to N times to eliminate afterimages.

When all the sequential operation modes are completed or a completion signal is input from the user to terminate the afterimage removal function during the sequential operation mode execution, the memory unit operates normally, and the image signal input from the outside is normally displayed on the screen. Display (step 440). Next, the output gain values for the R, G, and B video signals are set to minimum values and output (step 450).

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

According to an exemplary embodiment of the present invention, the image display device may execute at least one sequential operation mode having different output levels to remove afterimages, thereby preventing a product from being heated or increasing power consumption during the afterimage removal period. have. On the other hand, the initial sequential mode of operation can effectively satisfy the screen afterimage removal function initially by outputting the maximum gain for the R, G, B video signal for a predetermined time.

According to the present invention, high voltages are not scanned in the same pixel for a long time, and chemical degradation of each cell can be prevented to some extent. In addition, it is possible to more effectively perform screen residue removal by outputting the output level while increasing or decreasing the output data fixed to each pixel. In addition, since the user automatically turns off the screen afterimage removal function (ON), it is possible to ensure the safety of the product.

Claims (4)

In the method of removing the afterimage of the screen in the video display device, Setting a series of sequential operation modes for removing afterimages; Inputting a command to perform a screen afterimage removal function; Blocking an input image signal from being output from the memory unit; Executing the preset sequential operation mode sequentially for a predetermined time to perform afterimage removal; Displaying a normally input image when the preset sequential operation mode is completed The afterimage removal method of the video display device, characterized in that it comprises a. The method of claim 1, wherein the sequential operation mode is performed at least once, and sets output gain values for R, G, and B video signals according to each operation mode, and the first operation mode is R, G for a predetermined time. And outputting by setting the output gain of the B video signal to a maximum value. In the video display device having a screen afterimage removal function, A memory unit in which output gain values of R, G, and B image signals for at least one sequential operation mode are preset and stored; When the afterimage removal function is requested, the sequential operation mode stored in the memory unit is read, and the R, G, and B image signals are output according to the output gain values of the read sequential operation mode, and the respective sequential operation modes are written. Micro controller executes sequentially for a set time The video display device to execute the screen afterimage removal function. 4. The image display of claim 3, wherein the first sequential operation mode of the at least one sequential operation mode has a maximum value of an output gain value for R, G, and B image signals. device.