KR20100004184A - A display apparatus and method for compensating phase of image - Google Patents

Abstract

PURPOSE: A display apparatus and a phase compensation method thereof are provided to achieve a stable image in the display apparatus by measuring changes in the brightness of a sampling block and compensating the phase of the display apparatus. CONSTITUTION: A panel(150) displays an image under the control of a panel driver(140). A scaler(130) transmits an input image signal to the panel driver. A controller(160) displays a sampling block for compensation of phase offset to the input signal and compensates the phase offset based on the brightness change of the sampling block.

Description

A display apparatus and method for compensating phase of image

According to an embodiment of the present invention, in the display device, a phase of an external input signal may be automatically corrected, and such a configuration may also be easily corrected by using a luminance value of an image called a sampling block, and a phase correction thereof. It's about how.

Since the conventional display device does not have an automatic surface compensator, a user who purchases a display device has to manually perform screen calibration after inputting an image signal (RGB / H / V) output from his PC to the display device.

A screen correction method in the conventional display device will be described with reference to FIG. 1.

First, referring to a configuration of a display apparatus related to screen correction in the related art, an AD converter 1 for receiving an analog video signal RGB / H / V and converting it into a digital signal, and the AD converter 1 A format converting unit 4 for converting a format of the digital image signal outputted from the control panel to a display unit 5 of the display device, and outputting a video signal outputted from the format converting unit 4. A display unit 5 for receiving an image and displaying an image, and a microcomputer 3 for inputting screen adjustment data set by a user through a key input unit 2 and adjusting an image signal output to the display unit 5. .

When the user inputs the vertical / horizontal position adjustment data of the current video signal through the key input unit 2, the microcomputer 3 adjusts the H / V adjustment unit 4a of the format conversion unit 4 to present the PC. Adjust the vertical and horizontal position of the signal.

In this case, the vertical / horizontal position should be manually adjusted while the user visually checks the display state of the image.

In addition, when a user inputs phase adjustment data of a current video signal through the key input unit 2, the microcomputer 3 inputs a phase of a PC signal through a phase adjustment unit 1a of the AD converter 1. Adjust it.

In addition, the phase adjustment at this time is also manually adjusted while the user directly checks the distortion degree of the image.

As described above, when a user purchases a display device in the related art, the user visually checks the displayed image for the vertical / horizontal position and phase for each video signal mode (window mode, DOS mode, etc.) so as to fit the PC owned by the user. Had to be adjusted.

Further, it is difficult to visually determine the adjustment state, such as phase adjustment, it is difficult to perform manual adjustment.

The present invention has been proposed to solve the above problems, and when a video signal having various phases and frequencies is provided from the outside, a stable screen is provided to a user by measuring a luminance change of a sampling block and correcting the phase of the display device. An object of the present invention is to propose a display device and a method of providing the same.

A display device according to an embodiment of the present invention includes a panel for displaying an image; A panel driver for displaying an image on the panel; A scaler for transmitting an input image signal to the panel driver; And a controller configured to display a sampling block to correct a phase offset of the input video signal, and to vary the phase offset by using a luminance change of the sampling block.

According to another aspect of the present invention, a phase correction method of the display device is a method for correcting a phase of the RGB image signal in a display device that receives an RGB image signal provided from an external device and displays the same. Displaying a sampling block having; Calculating an amount of change in luminance with respect to an area or a pixel of the sampling block; Detecting a movement of the sampling block from the detected luminance change amount; And continuously varying a phase offset of the RGB image signal such that a movement amount of the sampling block is equal to or less than a preset reference value.

According to the embodiment of the present invention, there is an advantage that the phase of the image signal of the external input can be automatically corrected, and the execution of this process is also performed by displaying the sampling block and using the luminance value change thereto. The advantage is that no complicated hardware configuration is required.

Hereinafter, with reference to the accompanying drawings for the present embodiment will be described in detail. However, the scope of the idea of the present invention may be determined from the matters disclosed by the present embodiment, and the idea of the invention of the present embodiment may be performed by adding, deleting, or modifying components to the proposed embodiment. It will be said to include variations.

In the following description, the word 'comprising' does not exclude the presence of other elements or steps than those listed.

1 is a view showing the configuration of a display device according to an embodiment of the present invention.

Referring to FIG. 1, the display apparatus according to the embodiment includes a panel 150 displaying an image, a panel driver 140 for displaying an image on the panel 150, and an input image signal. And a controller 160 for correcting the phase and the frequency of the input video signal so as not to cause the shaking or shaking of the screen.

When the input image signal is analog RGB, the analog RGB is transmitted to the A / D converter 120 through the D-SUB connector 110, and the A / D converter 120 converts the analog RGB. Converted to digital RGB and transferred to the scaler (130).

When the input video signal is a digital signal, the digital signal is transmitted to the TMDS 170 through the DVI connector 180, and the TMDS 170 converts the digital signal into digital RGB to convert the scaler ( 130).

Meanwhile, when an analog RGB signal is input to the D-SUB connector 110, for example, when an analog RGB signal is input from a PC connected to a display device, the scaler 130 adjusts the phase and frequency of the received RGB signal. A scaling operation is performed to fit the panel 150.

Here, an analog RGB image signal having various phases and frequencies may be received through the D-SUB connector 110, and the controller 160 uses a sampling block for the received image to phase and frequency the image signal. To compensate for the panel 150 to fit.

That is, the controller 160 may be configured to suppress the shaking or shaking of the image displayed on the panel 150 by varying an offset of the phase with respect to an analog RGB image currently input by the user or automatically. Play a role.

In addition, the phase change of the RGB image by the controller 160 is performed when the resolution (or frequency) of the input RGB image does not match the panel 150, and is performed or input at the user's request. It can be done automatically by periodically checking the phase and frequency of.

In detail, the controller 160 performs an operation for detecting whether shaking or shaking occurs when the analog RGB signal input from the PC is displayed on the panel 150.

The controller 160 displays a sampling block corresponding to the received RGB signal and a cross hatch pattern serving as a reference line for determining whether the sampling block is damaged.

Here, the cross hatch pattern is used as a reference line for designating the designated position of the sampling block and the position of each pixel or unit region constituting the sampling block, and also as a reference line for determining the shaking of the sampling block. do.

The sampling pattern and the cross hatch pattern displayed by the controller 160 are illustrated in FIGS. 2 and 3, and will be described in detail with reference to this.

That is, the controller 160 selects a position to display the sampling block 200 in the register by using the H-back porch value and the V-back porch value delivered by the scaler 130. In this case, the sampling block 200 is displayed in the area where the video signal provided from the PC is displayed. The back porch signal has a direct current voltage level, referred to as a blank level (eg O Volt).

For example, it may be helpful to assume that a video signal for an Internet Explorer window from a PC is provided to the display device.

In addition, since the luminance of the sampling block 200 should be measured by the controller 160 in units of pixels or masks of a predetermined size, according to an exemplary embodiment of the present invention, it is preferable that the sampling block 200 has a single color. .

Meanwhile, the controller 160 displays the sampling block 200 by using the back porch value transmitted from the scaler 130 with respect to the input RGB signal, and measures the degree of movement of the sampling block 200. The cross hatch pattern 210 may be displayed as a reference line.

The cross hatch pattern 210 is formed of a first pattern 211 in a vertical direction and a second pattern 212 in a horizontal direction, and is formed between the first pattern 211 and the second pattern 212. The intervals of the intervals or the intervals between the patterns may be variously changed according to embodiments. However, the size of the cross hatch pattern 210 may be adjusted in consideration of the size of the sampling block 200 to be displayed.

Next, the controller 160 uses the luminance change of the sampling block 200 to determine whether a movement (or shaking) of the sampling block 200 occurs based on the cross hatch pattern 210.

That is, the controller 160 stores the positions of the respective points of the displayed sampling block 200 and detects whether a change in luminance with respect to the positions of the respective points is displayed. This is because, when the sampling block 200 is shaken, the luminance change occurs in the area around the edge of the sampling block 200. Therefore, measuring the luminance of the sampling block according to the embodiment of the present invention may be performed only for the edge region of the sampling block according to the embodiment.

Since the sampling block 200 is an image generated and displayed at the output terminal of the scaler 130, the image is shaken when the frequency and phase of the RGB image signal provided from the PC are not suitable for the panel 150. Therefore, the sampling block 200 also shakes due to the difference in phase and frequency.

In addition, the controller 160 detects whether a luminance change occurs in each of a plurality of regions (or pixels) of the displayed sampling block 200, and changes the phase offset of the RGB image signal according to the change amount. Do the work.

For example, the luminance of a specific pixel on the leftmost edge of the sampling block 200 is changed from the first luminance value to the second luminance value. If the change time is 3/60 seconds, the phase offset value may be changed by the corresponding time. . When the luminance values of the left and right edge regions of the sampling block 200 are changed, the image is swayed left and right, and thus the phase offset for adjusting the horizontal frequency may be varied.

The controller 160 may use a preset lookup table for a change amount of the luminance value or a phase offset change amount for the luminance value change time, and the lookup table is stored in the memory unit 190.

That is, the controller 160 measures the luminance value, the luminance change amount, or the luminance change time of the partial region (some pixels) or the entire region (all pixels) of the sampling block 200, and varies the luminance while varying the phase offset. Repeat this process until the amount of change drops below the preset value.

As a result, the controller 160 outputs a sampling block corresponding to the image in response to the image shaking caused by the phase of the input analog RGB signal not being suitable for the panel of the display device. Detecting a change in the luminance value of the control panel and suppressing the shaking of the image while gradually changing the phase offset according to the detected result.

Embodiments of the present invention as described above will be summarized with reference to the accompanying flowchart of FIG. 4.

First, when an embodiment of the present invention performs the process of varying the phase offset according to the user's selection, the user selects the automatic phase adjustment menu (S401).

Subsequently, the controller 160 of the display apparatus displays a sampling block for adjusting phase offset and a cross hatch pattern that can represent up, down, left, and right movements of the sampling block instead of the analog RGB image transmitted from the PC (S402).

In addition, the controller 160 calculates an amount of fluctuation variation for each region or each pixel of the sampling block (S403), and determines whether the sampling block moves, the movement speed, and the direction of movement from the detected luminance change amount (S404). .

Next, it is determined whether the movement degree of the sampling block is less than or equal to a preset reference value (S405), and when the movement is greater than or equal to the set value, the operation of changing the RGB phase offset is performed (S406). Here, the variation of the RGB phase offset may use a lookup table in which a phase offset variable value is recorded according to a degree of motion prepared in advance.

In addition, the variable operation of the RGB-PC phase offset is continuously performed until there is no movement of the sampling block or falls below a predetermined reference value.

By this operation, when the resolution of an image provided from an external device such as a PC and the panel resolution of the display device do not match, the phase offset of the RGB signal, which is an external input signal, can be automatically set to match the panel of the display device. There is an advantage.

In the above description, '~ part' indicating a component of the broadcasting system may be implemented as a kind of module. Here, the term 'module' refers to a software component or a hardware component such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and a module plays a role. However, modules are not meant to be limited to software or hardware. The module may be configured to be in an addressable storage medium and may be configured to execute one or more processors.

1 is a view showing the configuration of a display device according to an embodiment of the present invention.

2 and 3 are diagrams illustrating a configuration of displaying a sampling block using a back porch signal provided from a scaler according to an embodiment of the present invention.

4 is a view for explaining a phase correction method of a display device according to an embodiment of the present invention.

Claims (7)

A panel displaying an image; A panel driver for displaying an image on the panel; A scaler for transmitting an input image signal to the panel driver; And And a controller configured to display a sampling block to correct a phase offset with respect to the input video signal, and to vary the phase offset by using a luminance change of the sampling block. The method of claim 1, And the control unit displays the sampling block using a horizontal or vertical back porch value transmitted from the scaler. The method of claim 1, And the control unit displays a cross hatch pattern which serves as a reference line for the up, down, left, and right movements of the sampling block together with the sampling block. The method of claim 1, And the controller is configured to vary the phase offset until a luminance change of the sampling block falls below a preset reference value. A method for correcting a phase of an RGB image signal in a display device receiving an RGB image signal provided from an external device and displaying the same, Displaying a sampling block having a predetermined size; Calculating an amount of change in luminance with respect to an area or a pixel of the sampling block; Detecting a movement of the sampling block from the detected luminance change amount; And And continuously varying a phase offset of the RGB image signal such that a movement amount of the sampling block is equal to or less than a preset reference value. The method of claim 5, wherein The displaying of the sampling block may include displaying a first pattern serving as a reference line for left and right movements of the sampling block and a second pattern serving as a reference line for moving up and down the sampling block. Phase correction method. The method of claim 5, wherein The displaying of the sampling block may include determining a display position of the sampling block by using a horizontal back porch value or a vertical back porch value provided from a scaler performing a scaling operation on a decoded video signal. Phase correction method of the device.

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