KR20110017161A - Display device and method of controlling the same - Google Patents

Abstract

PURPOSE: A display device and a method of controlling the same are provided to supply an optimum image quality to a user by preventing the deterioration of an image in forcedly extending and shortening the color region of an image signal. CONSTITUTION: Setting information of an image quality function is monitored(S110). The image quality is supported by a display unit. An EDID content is changed by the setting information of the image quality function(S130,S140). Image quality information is defined by EDID. An external image device reads the changed EDID and is connected to a display device. .

Description

Display device and method of controlling the same}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display apparatus, and more particularly, to a display apparatus and a control method thereof capable of dynamically changing an EDID configuration to change whether to support an extended-gamut YCC (xvYCC) function.

In recent years, display apparatuses (eg, digital camcorders, TVs, set top boxes) have become common to embed recording media in which files are stored. Thus, the display apparatus can play back a file stored in a built-in recording medium.

In addition, the display device may be connected to an external device to communicate with each other. As such, since both are communicatively connected, the display device can also reproduce files stored in a recording medium built in an external device.

When the display apparatus plays an image, the display apparatus is based on a specific color gamut, and the range of the color gamut is widened according to the development of the display apparatus.

1 is a diagram illustrating a color range based on a standard YCbCr signal. The X axis represents a luminance signal (Y) value around the origin, and the Y axis represents a chromaticity signal (C) value.

As shown in FIG. 1, the color space is wide in order of the color gamut 110 for the sRGB signal, the color gamut for the sYCC 120 signal, and the color gamut for the xvYCC 130 signal.

Thus, the external device determines the color gamut of the image to be transmitted to the display device by using information about the color gamut supported by the display device. That is, if the display device supports the xvYCC function regardless of the input video signal, the external device converts the input video signal into an xvYCC signal and transmits the xvYCC signal to the display device.

However, the xvYCC function requires that the original image is captured / recorded in the xvYCC color gamut and transferred to the display device as it is, so that the display device can realize the best image quality without losing the image. However, the image recording supporting the xvYCC color gamut There is no existence of.

Accordingly, when the user of the display device turns off the xvYCC function, since there is no way for the external device to know, the sRGB signal is extended to the xvYCC signal and transmitted to the display device, and the display device transmits the xvYCC signal. Since the signal is reduced back to the sRGB signal, distortion of the original signal occurs.

According to an exemplary embodiment of the present invention, only when the xvYCC function is turned on in a display apparatus supporting the xvYCC function, an image signal transmitted by configuring the xvYCC color gamut may be provided.

In addition, according to an embodiment of the present invention, when the xvYCC function is turned off in a display device supporting the xvYCC function, an image signal made in the non-vvYCC color region as it is may be provided.

In addition, according to an embodiment of the present invention, EDID information corresponding to the setting state of the xvYCC function may be transmitted to an external device.

A control method of a display apparatus according to an exemplary embodiment of the present invention may include: determining a setting state of an image quality function supported by the display apparatus; Changing the EDID contents in which the information on the image quality function is defined based on the grasped state of the image quality function; And providing the read EDID to an external video device connected to the display device.

In addition, the display device according to an embodiment of the present invention includes an EDID memory unit for storing the EDID (Extended Display Identification Data) in which the quality information related information is defined; An external video device connected thereto, and a media interface configured to perform data communication with the connected external video device; And a controller configured to change an EDID stored in the EDID memory unit based on a preset state of the image quality function, and provide the changed EDID to be read by the connected external video device.

According to an embodiment of the present invention, since the EDID information is changed according to the setting state of the xvYCC function, the image quality of the video signal may be forcibly prevented from being deteriorated due to the expansion and contraction of the color gamut of the video signal, thereby providing the user with an image of optimum quality. It can work.

The proposed embodiment will be described.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. However, the spirit of the present invention is not limited to the embodiments presented, and other inventions which are further deteriorated by addition, change, deletion, etc. of other components, or other embodiments included within the scope of the present invention can be easily made. I can suggest.

The term used in the present invention was selected as a general term widely used as possible, but in some cases, the term is arbitrarily selected by the applicant, in which case the meaning is described in detail in the description of the invention, the name of a simple term It should be clear that the present invention is to be understood as a meaning of terms.

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

2 is a schematic view of a display system according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the display system according to an exemplary embodiment of the present invention includes an external video device 100 and a display device 300.

Here, the external image device 100 and the display device 300 are connected through a cable 201. In this case, although the external video device 100 and the display device are connected to each other through an HDMI (High Definition Multimedia Interface) cable, the external video device 100 and the display device are connected to a DVI cable other than the HDMI cable, and an S-Viedo cable. It will be apparent to those skilled in the art to which the present invention pertains. Hereinafter, it will be described on the assumption that the external video device 100 and the display apparatus 300 are connected through an HDMI cable.

In addition, the external video device 100 and the display apparatus 300 are connected through a display data channel (DDC) line 203. The DDC line 203 includes a data line and a clock line, and the HDMI cable 201 includes a Hot Plug Detection (HPD) signal line for confirming interconnection with a channel through which digital video and audio signals are transmitted.

The external video device 100 and the display device 300 are connected by the HDMI protocol, so that the external video device 100 corresponds to the HDMI transmitter and the display device 300 corresponds to the HDMI receiver. The external imaging apparatus 100 may also be referred to as a source apparatus or a host apparatus, and the display apparatus 300 may also be referred to as a sink apparatus corresponding to the external imaging apparatus 100.

The external video device 100 is connected to the display device 300 through the HDMI cable 201, transmits the digital video signal and the audio signal to the display device 300, and the display device 300 through the DDC line 203. EDID (Extended Display Identification Data) is read from.

The display apparatus 300 processes a digital video signal and an audio signal transmitted from the external video apparatus 100 and outputs the digital video signal to the user through a display unit and a speaker.

The external video device 100 transmits a video signal and an audio signal to the display apparatus 300. The external video device 100 includes a digital versatile disc (DVD) player, a set top box, a VTR, and a game machine. This corresponds.

The external video device 100 includes a decoder 101, an HDMI transmitter 103, and a transmitter control unit 105. The external video device 100 includes a tuner or an optical pickup according to a function unique to the external video device 100. And additional configurations such as an optical pickup device.

The decoder 101 parses and decompresses the original video data and audio data from the input AV stream under the control of the transmitter control unit 105, and decompresses and outputs the original video data and audio data to the HDMI transmitter 103.

The HDMI transmitter 103 is digitally generated by performing coding for an HDMI interface on the uncompressed digital video signal and / or audio signal received from the decoder 101 under the control of the transmitter side control unit 105. The video signal and / or the audio signal are transmitted to the display apparatus 300 through a transition minimized differential signaling (TMDS) channel.

The transmitter control unit 105 reads the EDID from the display apparatus 300 through the DDC line 203, and controls the decoder 101 and the HDMI transmitter 103 based on the read EDID to control the digital video signal and audio. The signal is controlled to be transmitted to the display apparatus 300.

Before the reception of the EDID and the transmission of the digital video / audio data, the transmitting side controller 105 receives a predetermined detection signal from the display apparatus 300 through the HDMI cable 201 to determine whether the display apparatus 300 is connected. To judge. Here, the detection signal received from the display apparatus 300 is preferably a hot plug detection (HPD) signal having a logic high level voltage.

The transmitter control unit 105 determines whether the voltage level of the HPD signal is a high level higher than or equal to a predetermined voltage level. Read The protocol in which the transmitting controller 105 reads the EDID from the display apparatus 300 may correspond to an inter-IC bus (I2C) protocol.

In addition, the transmitting side controller 105 analyzes the image quality function information defined in the specific region of the EDID read from the display apparatus 300 to determine whether the connected display apparatus 300 supports the image quality function.

Here, the image quality function is preferably an extended-gamut YCC (xvYCC) function.

The extended-gamut YCC (xvYCC) is a function newly added to the HDMI 1.3 standard and indicates a function for transmitting an image signal configured based on an extended color gamut.

Accordingly, the transmitter-side control unit 105 analyzes the extended-gamut YCC (xvYCC) information defined in the specific region of the EDID, and supports the extended-gamut YCC (xvYCC) function in the connected display device 300. Find out if you are.

As a result of analyzing the EDID, if the display apparatus supports the extended-gamut YCC (xvYCC) function, the transmitter-side control unit 105 may determine that an input signal corresponds to the extended-gamut YCC (xvYCC) color gamut. It is converted into and transmitted to the display device.

In addition, if the display apparatus does not support the extended-gamut YCC (xvYCC) function, the input signal corresponding to the primary color gamut is transmitted to the display apparatus as it is.

For example, when the display apparatus supports an extended-gamut YCC (xvYCC) function and the input signal is an sRGB signal, the transmitting side control unit 105 determines that the sRGB signal is an xvYCC (Extended-gamut YCC) signal. In order to control the expansion, the extended-gamut YCC (xvYCC) signal is transmitted to the display apparatus 300 accordingly. On the contrary, when the display apparatus does not support the extended-gamut YCC (xvYCC) function and the input signal is the sRGB signal, the transmitter side control unit 105 transmits the input sRGB signal to the display apparatus 300 as it is. To be transmitted.

The configuration of the external imaging apparatus 100 has been described above, and the configuration of the display apparatus 300 will be described below.

The display device 300 corresponds to a digital television (DTV) or a monitor, and processes and outputs a digital video signal and an audio signal transmitted from the external video device 100.

When the external image apparatus 100 is connected, the display apparatus 300 may inform the external image apparatus 100 that the external image apparatus 100 is connected to each other by outputting an HPD signal.

The display apparatus 300 may check the EDID data stored in the EDID memory unit 313 and restore the EDID data. Therefore, even if the EDID data recorded in the EDID memory unit 313 in the display device 300 is damaged, the external video device 100 reads the EDID data again by restoring the EDID memory unit 313 without replacing it. Do not have

The EDID refers to a standard for transferring display information from the display side to the host side. The specification here does not prescribe an interface signal like a display data channel (DDC), but rather a data format for conveying the capabilities of the display to the host. The EDID includes additional information such as a manufacturer ID, a product ID, a serial number of the display device, and also includes audio or video format information that can be accommodated by the EDID.

Here, in the embodiment according to the present invention, the EDID defines the extended-gamut YCC (xvYCC) function related information in the EDID, and the EDID memory unit 313 defines the EDID in which the extended-gamut YCC (xvYCC) function related information is defined. Store in The following description focuses on the operation of the EDID data structure and the processing of the input image signal of the display apparatus 300, and the description of other parts will be briefly described.

Referring to FIG. 1, the display apparatus 300 includes an HDMI receiver 301, an image processor 303, an audio processor 305, a display unit 307, an audio output unit 309, a memory 311, and an EDID ROM ( 313, a switching unit 315, a receiving side control unit 317, and a connection terminal 319.

The display device 300 is connected to the external video device 100 through the connection terminal 319. The HDMI receiver 301 decodes the digital video signal and the audio signal received from the HDMI transmitter 103 according to the HDMI protocol under the control of the receiver controller 317 to perform the video processor 303 and the audio processor 305. Will output

The image processor 303 processes the digital image signal received from the HDMI receiver 301 and displays the same to the user through the display unit 307 under the control of the receiver controller 317. In this case, the image processor 303 includes a scaler for converting the digital video signal into a signal suitable for the output format of the display unit 307, and a frame rate converter for converting the frame rate of the converted video signal.

The audio processor 305 converts the digital audio signal received from the HDMI receiver 301 into an analog audio signal and provides the converted audio signal to the audio output unit 309 under the control of the receiver controller 317. The audio output unit 309 amplifies the received analog audio signal and outputs the same through the speaker.

The memory 311 stores programs related to the operation of the display apparatus 300 and various data generated during the operation of the display apparatus 300.

The EDID memory unit 313 stores EDID data and is connected to the connection terminal 319 or the receiving side controller 317 through the switching unit 315. When the external video device 100 is connected, the EDID memory unit 313 may be connected to the DDC line 203 through the connection terminal 319, and may be connected to the transmitting side controller 105.

The EDID memory unit 313 is embodied as an EEPROM (Electrically Erasable Programmable Read-Only Memory), and is preferably connected to the transmitting side control unit 105 or the receiving side control unit 317 according to the I2C scheme.

Here, the structure of the EDID is as shown in FIG. That is, the code 400 of the EDID data is from 0 to 7, where the code '7' 410 can be arbitrarily designated and used by the user. That is, code '0' is a reserved code, code '1' is a code for audio data, and code '2' is a clock for video data.

In addition, the code '7' 410 is a use extended tag, and a user may arbitrarily set a code and configure a payload byte following it.

In addition, as shown in FIG. 3, the code '7' includes an extended tag code, which is a lower code of 0 to 255, and a specific extended tag code not used is related to the extended-gamut YCC (xvYCC) function. Can be used as code to define information.

That is, in the lower code of the code '7', 0 to 31 extended tag code is used to define specific information, and 32 to 255 extended tag code is generally empty to define specific information, and 32 to 255 extended. After specifying a specific extended tag code among tag codes as a code for defining the information related to the extended-gamut YCC (xvYCC) function, the information related to the extended-gamut YCC (xvYCC) function is defined in the payload byte following it. Can be. In addition, the code related to the extended-gamut YCC (xvYCC) function may be defined using a code other than the code '7'.

In the present invention, it will be described on the assumption that 32 Extended Tag Code is designated as a code for defining the extended-gamut YCC (xvYCC) function related information.

If the 32 Extended Tag Code 500 is designated as a code for defining information related to the extended-gamut YCC (xvYCC) function, the payload that follows is configured.

As shown in FIG. 5, corresponding code information 07h and length of following data block (in bytes) 03h are defined in the first byte of the following payload.

In the second byte, extended tag code information specified in the upper code 07h is defined. That is, if 32 Extended Tag Code is designated as a code for defining xvYCC (Extended-gamut YCC) function related information as described above, the second byte is defined as xvYCC (Extended-gamut YCC) support Tag code 32. . In addition, the following bytes are determined according to the data length defined in the first byte.

The third and fourth bytes define xvYCC (Extended-gamut YCC) function related information for the corresponding display, respectively. Here, the information related to the extended-gamut YCC (xvYCC) function includes information on whether the extended-gamut YCC (xvYCC) function is supported and the color gamut information to be supported.

That is, in the third byte, whether the support of the extended-gamut YCC (xvYCC) function for the corresponding display device is defined. For example, if xvYCC (Extended-gamut YCC) function is supported in the display device, it may be defined as '1' and '0' if not.

As shown in FIG. 6, xvYCC (Extended-gamut YCC) includes xvYCC ₆₀₁ and xvYCC ₇₀₉ is present.

The xvYCC ₆₀₁ is an xvYCC function of SD (Standard Definition) class, and the xvYCC ₇₀₉ is an xvYCC function of HD (High Difinition) class.

The switching unit 315 switches the EDID ROM 313 to be connected to one of the receiving side controller 317 and the transmitting side controller 105 under the control of the receiving side controller 317.

The switching unit 315 connects the transmitting side control unit 105 and the EDID ROM 313 in a normal state, and is connected to the receiving side control unit 317 under the control of the receiving side control unit 317. Do.

The receiving side controller 317 controls the overall operation of the display apparatus 300, processes the digital video signal and the audio signal transmitted from the external video apparatus 100, displays them on the display unit 307, and outputs them through a speaker. do.

That is, when the connection of the external video device 100 is detected, the receiving side controller 317 provides the connected external video device 100 to read the EDID data stored in the EDID memory unit 313. .

At this time, the receiving side controller 317 determines the setting state of the extended-gamut YCC (xvYCC). That is, the xvYCC (Extended-gamut YCC) function may be set to an on state, an off state, and an automatic state according to a user's selection.

When the extended-gamut YCC (xvYCC) function is set to the on state, the input signal is forcibly extended and provided to the xvYCC signal. In addition, when the extended-gamut YCC (xvYCC) function is set to the off state, the input signal is forcibly reduced to fit the non-xvYCC signal, and when set to the automatic state, xvYCC is selectively selected according to information of the input signal. Provided as a signal or a non-xvYCC signal.

In this case, if the display apparatus 300 supports the extended-gamut YCC (xvYCC) function, the external video apparatus always transmits only the signal extended with the xvYCC signal to the display apparatus.

In this case, when the sRGB signal is forcibly extended to the xvYCC signal, the display apparatus displays the extended xvYCC signal without any problem. However, when the xvYCC (Extended-gamut YCC) function is set to off, the xvYCC signal Since the display is reduced to the sRGB signal again, distortion occurs in the original signal.

Accordingly, the receiving side controller 317 determines the preset state of the extended-gamut YCC (xvYCC) function and changes the prestored EDID to match the setting state of the extended-gamut YCC (xvYCC) function.

That is, as shown in FIG. 5, information on whether to support the extended-gamut YCC (xvYCC) function is defined in a specific area of the EDID. As described above, when the extended-gamut YCC (xvYCC) function is supported, it is defined as a '1' code, and when the extended-gamut YCC (xvYCC) function is not supported, it is defined as a '0' code.

Therefore, when the extended-gamut YCC (xvYCC) function is set to an on state or an automatic state, the receiving side controller 317 changes the prestored EDID to a supported state of the extended-gamut YCC (xvYCC) function.

That is, as shown in FIG. 7, the area in which information about whether the xvYCC (Extended-gamut YCC) function is supported or not is changed to a '1' code so that the xvYCC (Extended-gamut YCC) function is changed in the display apparatus. Allow the external video device to recognize that it is supported.

In addition, when the extended-gamut YCC (xvYCC) function is set to the off state, the receiving controller 317 changes the prestored EDID to an unsupported state of the extended-gamut YCC (xvYCC) function.

That is, as shown in FIG. 8, by changing the region where the support of the extended-gamut YCC (xvYCC) function is defined to a '0' code, the extended-gamut YCC (xvYCC) function is not supported in the display device. Allow the external video device to recognize that the image is present.

Accordingly, when the extended-gamut YCC (xvYCC) function is set to the off state, the receiving side controller 317 may provide a primary color gamut signal (sRGB) signal that is not extended to the xvYCC signal from the external video device. do.

In addition, when the previously stored EDID is changed as described above, the receiving controller 317 outputs a control signal so that the connected EDID can be read again by the connected external video apparatus.

That is, as described above, when the high level HPD signal is provided from the display apparatus 300, the external imaging apparatus 100 detects a connection with the display apparatus, and accordingly detects the EDID stored in the display apparatus. Read it.

Accordingly, the receiving side controller 317 instantly changes the HPD signal of the media interface unit to which the external video device 100 is connected to the low state. If the HPD signal is changed from the high state to the low state and then changed back to the high state, the external video device 100 detects an abnormal connection with the display device and accordingly reads the EDID of the connected display device again. I will go.

Therefore, the receiving side controller 310 instantly changes the HPD signal to a low state and provides the external image apparatus 100 to read the changed EDID.

As described above, according to the embodiment of the present invention, since the EDID information is changed according to the setting state of the xvYCC function, the image quality is prevented from being deteriorated due to the expansion and contraction of the color gamut of the video signal, which is optimal for the user. Can provide an image.

9 is a flowchart illustrating a step-by-step control method of a display apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 9, first, a connection of an external video device is detected (step 100). That is, as the high level signal is detected through the Hot Plug Detection (HPD) signal line, the external image device is recognized.

When the connection of the external video device is detected, the setting state of the preset xvYCC function is determined (step 110). That is, it checks whether the xvYCC function is set to the on state, the off state, or the auto state.

Subsequently, it is determined whether the checked setting state of the xvYCC function is off (step 120).

If the checked setting of the xvYCC function is off, the previously stored EDID is changed to a state indicating that the xvYCC function is not supported (step 130). That is, as shown in FIG. 7, the code information of the region in which the xvYCC function related information is defined is changed to '0' so that the supported state of the xvYCC function becomes unsupported.

In addition, if the checked state of the xvYCC function is not turned off, the previously stored EDID is changed to indicate that the xvYCC function is supported (step 140). That is, as shown in FIG. 8, the external video apparatus may recognize that the display apparatus supports the xvYCC function by changing the code information of the region where the xvYCC function related information is defined by '1'fh. Make sure

In operation 150, the EDID in which the support state of the xvYCC function is changed is re-stored in the memory unit.

Then, the stored EDID is changed to the low state after the HPD signal is instantly changed to the high state so as to be read back from the connected external video device (steps 160 and 170).

As described above, according to the embodiment of the present invention, since the EDID information is changed according to the setting state of the xvYCC function, it is forcibly prevented from deterioration of image quality that may occur due to the expansion and reduction of the color gamut of the image signal, thereby making it optimal for the user. Can provide an image.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 shows a color range based on a standard YCbCr signal.

2 is a schematic diagram of a display system according to an exemplary embodiment of the present invention.

3 to 8 are diagrams for explaining an EDID structure in which xvYCC (Extended-gamut YCC) function related information is defined according to an embodiment of the present invention.

9 is a flowchart illustrating a step-by-step control method of a display apparatus according to an exemplary embodiment of the present invention.

Claims (12)

In the control method of the display device, Determining a setting state of an image quality function supported by the display apparatus; Changing the EDID contents in which the information on the image quality function is defined based on the grasped state of the image quality function; And, And providing the changed EDID to be read by an external video device connected to the display device. The method of claim 1, And the image quality function is an extended-gamut YCC (xvYCC) function. The method of claim 1, Changing the contents of the EDID is And changing a definition state of whether or not the image quality function is supported. The method of claim 1, And a setting state of the image quality function includes at least one of a first state, a second state, and a third state. The method of claim 4, wherein And the EDID is changed to an unsupported state of the image quality function when the setting state of the image quality function is the first state. The method of claim 4, wherein And the EDID is changed to a support state of the image quality function when the setting state of the image quality function is a second or third state. The method of claim 1, Providing the changed EDID to be read And changing the HPD (High Plug Detection) signal to a low state at a moment. The method of claim 5, And receiving a signal corresponding to a primary color region from the external video apparatus based on the EDID changed according to the first state. An EDID memory unit storing EDID (Extended Display Identification Data) in which image quality function related information is defined; A media interface connected to an external video device and performing data communication with the connected external video device; And, And a controller configured to change an EDID stored in the EDID memory unit based on a preset state of the image quality function, and provide the changed EDID to be read by the connected external video device. The method of claim 9, And the controller changes an EDID region in which information on whether the image quality function is supported or not is changed. The method of claim 10, And the control unit changes the contents of the EDID so that the image quality function is not supported when the image quality function is set to off. The method of claim 9, And the control unit changes the HPD (High Plug Detection) signal of the media interface unit to a low state when the EDID is changed and controls the external image apparatus to read the changed EDID.

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