KR20110139596A - Apparatus for displaying image and method for operating the same - Google Patents

Abstract

PURPOSE: An image display device and an operating method thereof are provided to prevent crosstalk and non-operation phenomena. CONSTITUTION: A control unit(170) outputs a reference signal based on a synchronous signal of an image signal. A transmitting unit transmits a reference signal. A shutter glass(195) receives the reference signal and includes a left eye glass and a right eye glass. The left eye glass and the right eye glass are opened based on a frequency of the reference signal. The frequency of the reference signal is smaller than the frequency of the synchronous signal.

Description

Apparatus for displaying image and method for operating the same}

The present invention relates to a method of operating a video display device, and more particularly, to a video display device and a method of operating the same, which can reduce a crosstalk phenomenon when viewing a 3D image and more accurately view a 3D image.

The image display device is a device having a function of displaying an image that a user can watch. The user can watch the broadcast through the image display device. A video display device displays a broadcast selected by a user among broadcast signals transmitted from a broadcast station on a display. Currently, broadcasting is shifting from analog broadcasting to digital broadcasting worldwide.

Digital broadcasting refers to broadcasting for transmitting digital video and audio signals. Digital broadcasting is more resistant to external noise than analog broadcasting, so it has less data loss, is advantageous for error correction, has a higher resolution, and provides a clearer picture. In addition, unlike analog broadcasting, digital broadcasting is capable of bidirectional services.

Recently, various studies on stereoscopic images have been conducted, and stereoscopic imaging techniques are becoming more and more common and practical in computer graphics as well as in various other environments and technologies.

Disclosure of Invention An object of the present invention is to provide a video display device and a method of operating the same, which can reduce a crosstalk phenomenon when viewing a 3D video, and can view a 3D video more accurately.

According to an aspect of the present invention, there is provided a video display device including a controller for outputting a reference signal, a transmitter for transmitting the reference signal, and a reference signal for receiving the reference signal. And a shutter glass having a left eye glass and a right eye glass opened based on a frequency of the signal, wherein the frequency of the reference signal is smaller than the frequency of the synchronization signal.

In accordance with another aspect of the present invention, an image display device detects a rising or falling edge of a received reference signal, measures a frequency of the reference signal, and measures a frequency of the reference signal. And a shutter glass having a left eye glass and a right eye glass that are opened on the basis.

In accordance with another aspect of the present invention, there is provided a method of operating an image display apparatus, the method including generating a reference signal based on a synchronization signal of an image signal, transmitting the reference signal to a shutter glass, and the reference signal. And opening the left eye glass and the right eye glass of the shutter glass based on the frequency of the signal, wherein the frequency of the reference signal is smaller than the frequency of the synchronization signal.

According to the present invention, it is possible to prevent crosstalk and inaction, and to view 3D images more accurately and easily.

1 is an internal block diagram of an image display apparatus according to an embodiment of the present invention.
FIG. 2 is an internal block diagram of the controller of FIG. 1.
3 is a diagram illustrating an example of a 3D video signal format capable of implementing 3D video.
4 is a diagram illustrating an operation of a shutter glass according to a frame sequential format.
5 is an internal block diagram of a shutter glass according to an embodiment of the present invention.
6 to 7 are diagrams showing an example of a signal for a shutter glass.
8 is a flowchart illustrating a method of operating an image display apparatus according to an embodiment of the present invention.
9 to 10 are diagrams for describing an operating method of the image display apparatus of FIG. 8.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The suffixes "module" and "unit" for components used in the following description are merely given in consideration of ease of preparation of the present specification, and do not impart any particular meaning or role by themselves. Therefore, the "module" and "unit" may be used interchangeably.

1 to 2 are internal block diagrams of an image display apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the image display apparatus 100 according to an exemplary embodiment of the present invention includes a tuner 110, a demodulator 120, an external device interface unit 130, a network interface unit 135, and a storage unit ( 140, the user input interface unit 150, the control unit 170, the display unit 180, the audio output unit 185, the power supply unit 190, and the 3D image viewing apparatus, for example, the shutter glass 195. It may include.

The tuner 110 selects an RF broadcast signal corresponding to a channel selected by a user or all pre-stored channels among RF (Radio Frequency) broadcast signals received through an antenna. Also, the selected RF broadcast signal is converted into an intermediate frequency signal, a baseband image, or a voice signal.

For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted into a digital IF signal (DIF). If the selected RF broadcast signal is an analog broadcast signal, it is converted into an analog baseband image or voice signal (CVBS / SIF). That is, the tuner 110 may process a digital broadcast signal or an analog broadcast signal. The analog baseband video or audio signal CVBS / SIF output from the tuner 110 may be directly input to the controller 170.

Also, the tuner 110 can receive RF carrier signals of a single carrier according to an Advanced Television System Committee (ATSC) scheme or RF carriers of a plurality of carriers according to a DVB (Digital Video Broadcasting) scheme.

Meanwhile, the tuner 110 sequentially selects RF broadcast signals of all broadcast channels stored through a channel memory function among RF broadcast signals received through an antenna and converts them into intermediate frequency signals or baseband video or audio signals. I can convert it.

The demodulator 120 receives the digital IF signal DIF converted by the tuner 110 and performs a demodulation operation.

For example, when the digital IF signal output from the tuner 110 is the ATSC scheme, the demodulator 120 performs an 8-VSB (8-Vestigal Side Band) demodulation. Also, the demodulation unit 120 may perform channel decoding. To this end, the demodulator 120 includes a trellis decoder, a de-interleaver, and a reed solomon decoder to perform trellis decoding, deinterleaving, Solomon decoding can be performed.

For example, when the digital IF signal output from the tuner 110 is a DVB scheme, the demodulator 120 performs COFDMA (Coded Orthogonal Frequency Division Modulation) demodulation. Also, the demodulation unit 120 may perform channel decoding. For this, the demodulator 120 may include a convolution decoder, a deinterleaver, and a reed-solomon decoder to perform convolutional decoding, deinterleaving, and reed solomon decoding.

The demodulation unit 120 may perform demodulation and channel decoding, and then output a stream signal TS. In this case, the stream signal may be a signal multiplexed with a video signal, an audio signal, or a data signal. For example, the stream signal may be an MPEG-2 TS (Transport Stream) multiplexed with an MPEG-2 standard video signal, a Dolby AC-3 standard audio signal, or the like. Specifically, the MPEG-2 TS may include a header of 4 bytes and a payload of 184 bytes.

On the other hand, the demodulator 120 described above can be provided separately according to the ATSC system and the DVB system. That is, it can be provided as an ATSC demodulation unit and a DVB demodulation unit.

The stream signal output from the demodulator 120 may be input to the controller 170. After performing demultiplexing, image / audio signal processing, and the like, the controller 170 outputs an image to the display unit 180 and outputs an audio to the audio output unit 185.

The external device interface unit 130 may connect the external device to the image display device 100. To this end, the external device interface unit 130 may include an A / V input / output unit (not shown) or a wireless communication unit (not shown).

The external device interface unit 130 may be connected to an external device such as a digital versatile disk (DVD), a Blu-ray, a game device, a camera, a camcorder, a computer (laptop), or the like by wire / wireless. The external device interface unit 130 transmits an image, audio or data signal input from the outside to the controller 170 of the image display device 100 through a connected external device. In addition, the controller 170 may output an image, audio, or data signal processed by the controller 170 to a connected external device. To this end, the external device interface unit 130 may include an A / V input / output unit (not shown) or a wireless communication unit (not shown).

The A / V input / output unit includes a USB terminal, a CVBS (Composite Video Banking Sync) terminal, a component terminal, an S-video terminal (analog), and a DVI so that video and audio signals of an external device can be input to the video display device 100. (Digital Visual Interface) terminal, HDMI (High Definition Multimedia Interface) terminal, RGB terminal, D-SUB terminal and the like.

The wireless communication unit can perform short-range wireless communication with other electronic devices. The image display device 100 may be connected to other electronic devices and networks according to communication standards such as Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, etc. Can be connected.

In addition, the external device interface unit 130 may be connected through at least one of the various set top boxes and the various terminals described above to perform input / output operations with the set top box.

The external device interface unit 130 may transmit / receive data and signals with the shutter glass 195 according to various communication methods such as an RF (Radio Frequency) communication method and an infrared (IR) communication method.

The network interface unit 135 provides an interface for connecting the image display apparatus 100 to a wired / wireless network including an internet network. The network interface unit 135 may include an Ethernet terminal for connection with a wired network, and for connection with a wireless network, a WLAN (Wi-Fi) or a Wibro (Wireless). Broadband, Wimax (World Interoperability for Microwave Access), High Speed Downlink Packet Access (HSDPA) communication standards, and the like may be used.

The network interface unit 135 may receive content or data provided by the Internet or a content provider or a network operator through a network. That is, content such as a movie, an advertisement, a game, a VOD, a broadcast signal, and related information provided from a content provider may be received through a network. In addition, the update information and the update file of the firmware provided by the network operator can be received. It may also transmit data to the Internet or content provider or network operator.

In addition, the network interface unit 135 is connected to, for example, an Internet Protocol (IP) TV, and receives the video, audio, or data signals processed in the set-top box for the IPTV to enable bidirectional communication. The signal processed by the controller 170 may be transmitted to the set-top box for the IPTV.

Meanwhile, the above-described IPTV may mean ADSL-TV, VDSL-TV, FTTH-TV, etc. according to the type of transmission network, and include TV over DSL, Video over DSL, TV overIP (TVIP), and Broadband TV ( BTV) and the like. In addition, IPTV may also mean an Internet TV capable of accessing the Internet, or a full browsing TV.

The storage 140 may store a program for processing and controlling each signal in the controller 170, or may store a signal-processed video, audio, or data signal.

In addition, the storage unit 140 may perform a function for temporarily storing an image, audio, or data signal input to the external device interface unit 130. In addition, the storage 140 may store information on a predetermined broadcast channel through a channel storage function such as a channel map.

The storage unit 140 may include a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory), It may include at least one type of storage medium such as RAM, ROM (EEPROM, etc.). The image display apparatus 100 may reproduce and provide a file (video file, still image file, music file, document file, etc.) stored in the storage 140 to a user.

1 illustrates an embodiment in which the storage unit 140 is provided separately from the control unit 170, but the scope of the present invention is not limited thereto. The storage 140 may be included in the controller 170.

The user input interface unit 150 transmits a signal input by the user to the control unit 170 or a signal from the control unit 170 to the user.

For example, the user input interface unit 150 may be powered on / off, channel selection, and screen from the remote controller 200 according to various communication methods such as a radio frequency (RF) communication method and an infrared (IR) communication method. A user input signal such as a setting may be received, or a signal from the controller 170 may be transmitted to the remote controller 200.

In addition, for example, the user input interface unit 150 may transmit a user input signal input from a local key (not shown) such as a power key, a channel key, a volume key, and a set value to the controller 170.

In addition, for example, the user input interface unit 150 may transmit a user input signal input from a sensing unit (not shown) that senses a user's gesture to the controller 170 or may transmit a signal from the controller 170. The transmission may be transmitted to a sensing unit (not shown). Here, the sensing unit (not shown) may include a touch sensor, an audio sensor, a position sensor, an operation sensor, and the like.

The controller 170 demultiplexes the input stream or processes the demultiplexed signals through the tuner 110, the demodulator 120, or the external device interface unit 130, and outputs a video or audio signal. You can create and output.

The image signal processed by the controller 170 may be input to the display unit 180 and displayed as an image corresponding to the image signal. In addition, the image signal processed by the controller 170 may be input to the external output device through the external device interface unit 130.

The voice signal processed by the controller 170 may be sound output to the audio output unit 185. In addition, the voice signal processed by the controller 170 may be input to the external output device through the external device interface unit 130.

Although not shown in FIG. 1, the controller 170 may include a demultiplexer, an image processor, and the like. This will be described later with reference to FIG. 2.

In addition, the controller 170 may control overall operations of the image display apparatus 100. For example, the controller 170 may control the tuner 110 to control the tuner 110 to select an RF broadcast corresponding to a channel selected by a user or a pre-stored channel.

In addition, the controller 170 may control the image display apparatus 100 by a user command or an internal program input through the user input interface unit 150.

For example, the controller 170 controls the tuner 110 to input a signal of a selected channel according to a predetermined channel selection command received through the user input interface unit 150. Then, video, audio, or data signals of the selected channel are processed. The controller 170 allows the channel information selected by the user to be output through the display unit 180 or the audio output unit 185 together with the processed image or audio signal.

As another example, the controller 170 may, for example, receive an external device image playback command received through the user input interface unit 150, from an external device input through the external device interface unit 130, for example, a camera or a camcorder. Video signal or audio signal may be output through the display unit 180 or the audio output unit 185.

The controller 170 may control the display 180 to display an image. For example, a broadcast image input through the tuner 110, an external input image input through the external device interface unit 130, or an image input through the network interface unit 135 or an image stored in the storage unit 140. May be controlled to be displayed on the display unit 180.

In this case, the image displayed on the display unit 180 may be a still image or a video, and may be a 2D image or a 3D image.

Meanwhile, the controller 170 may generate and display a 3D object with respect to a predetermined object in the image displayed on the display 180. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), an EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and text.

Such a 3D object may be processed to have a depth different from that of the image displayed on the display unit 180. Preferably, the 3D object may be processed so as to protrude compared to the image displayed on the display unit 180.

The controller 170 recognizes a user's position based on an image photographed by a photographing unit (not shown). For example, the distance (z-axis coordinate) between the user and the image display apparatus 100 may be determined. In addition, the x-axis coordinates and the y-axis coordinates in the image display apparatus 100 corresponding to the user position can be grasped.

On the other hand, although not shown in the figure, it may be further provided with a channel browsing processing unit for generating a thumbnail image corresponding to the channel signal or the external input signal. The channel browsing processor may receive a stream signal TS output from the demodulator 120 or a stream signal output from the external device interface 130, extract a video from the input stream signal, and generate a thumbnail image. Can be. The generated thumbnail image may be input as it is or encoded to the controller 170. In addition, the generated thumbnail image may be encoded in a stream form and input to the controller 170. The controller 170 may display a thumbnail list including a plurality of thumbnail images on the display unit 180 using the input thumbnail image. In this case, the thumbnail list may be displayed in a simple viewing manner displayed in a partial region while a predetermined image is displayed on the display unit 180 or in an entire viewing manner displayed in most regions of the display 180. .

The display unit 180 converts an image signal, a data signal, an OSD signal, a control signal, or an image signal, a data signal, a control signal, etc. received from the external device interface unit 130 processed by the controller 170, and a driving signal. Create

The display unit 180 may be a PDP, an LCD, an OLED, a flexible display, and the like, and in particular, it is preferable that a 3D display is possible according to an embodiment of the present invention.

For viewing the 3D image, the display unit 180 may be divided into an additional display method and a single display method.

The independent display method may implement a 3D image by the display unit 180 alone without an additional display, for example, glasses, and the like, for example, various methods such as a lenticular method and a parallax barrier. This can be applied.

Meanwhile, the additional display method may implement an additional display, that is, a 3D image using a 3D image viewing apparatus in addition to the display unit 180. For example, various methods such as a head mounted display (HMD) type and glasses type may be applied. Can be. In addition, the spectacle type may be further divided into a passive method such as a polarized glasses type and an active method such as a shutter glass type. On the other hand, the head mounted display type can be divided into passive and active methods.

In one embodiment of the present invention, the shutter glasses 195 may be provided for viewing 3D images.

The display unit 180 may be configured as a touch screen and used as an input device in addition to the output device.

The audio output unit 185 receives a signal processed by the controller 170, for example, a stereo signal, a 3.1 channel signal, or a 5.1 channel signal, and outputs a voice signal. The audio output unit 185 may be implemented by various types of speakers.

Meanwhile, in order to detect a gesture of a user, as described above, a sensing unit (not shown) including at least one of a touch sensor, a voice sensor, a position sensor, and a motion sensor may be further provided in the image display apparatus 100. have. The signal detected by the sensing unit (not shown) is transmitted to the controller 170 through the user input interface unit 150.

The controller 170 may detect a gesture of the user by combining or combining the image photographed by the photographing unit (not shown) or the detected signal from the sensing unit (not shown).

The power supply unit 190 supplies the corresponding power throughout the image display apparatus 100. In particular, power may be supplied to the controller 170, which may be implemented in the form of a System On Chip (SOC), a display unit 180 for displaying an image, and an audio output unit 185 for audio output. Can be.

The remote control apparatus 200 transmits the user input to the user input interface unit 150. To this end, the remote control device 200 may use infrared (IR) communication, RF (Radio Frequency) communication, Bluetooth (Bluetooth), UWB (Ultra Wideband), ZigBee (ZigBee) method and the like. In addition, the remote control apparatus 200 may receive an image, an audio or a data signal output from the user input interface unit 150, and display or output the audio from the remote control apparatus 200.

The video display device 100 described above is a fixed type of ATSC (8-VSB) digital broadcasting, DVB-T (COFDM) digital broadcasting, ISDB-T (BST-OFDM) digital broadcasting, and the like. It may be a digital broadcast receiver capable of receiving at least one. In addition, as a mobile type, digital broadcasting of terrestrial DMB system, digital broadcasting of satellite DMB system, digital broadcasting of ATSC-M / H system, digital broadcasting of DVB-H system (COFDM system) and media flow link only system It may be a digital broadcast receiver capable of receiving at least one of digital broadcasts. It may also be a digital broadcast receiver for cable, satellite communications, or IPTV.

On the other hand, the video display device described in the present specification is a TV receiver, a mobile phone, a smart phone (notebook computer), a digital broadcasting terminal, PDA (Personal Digital Assistants), PMP (Portable Multimedia Player), etc. May be included.

Meanwhile, a block diagram of the image display apparatus 100 shown in FIG. 1 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted according to the specifications of the image display apparatus 100 that is actually implemented. That is, two or more constituent elements may be combined into one constituent element, or one constituent element may be constituted by two or more constituent elements, if necessary. In addition, the functions performed in each block are intended to illustrate the embodiments of the present invention, and the specific operations and apparatuses do not limit the scope of the present invention.

FIG. 2 is an internal block diagram of the controller of FIG. 1. FIG. 3 is a diagram illustrating an example of a 3D video signal format capable of implementing 3D video. FIG. 4 is a diagram illustrating an operation of a shutter glass according to a frame sequential format. .to be.

Referring to the drawings, the control unit 170 according to an embodiment of the present invention, the demultiplexer 210, the image processor 220, the OSD generator 240, the mixer 245, the frame rate converter 250, and a formatter 260. In addition, the apparatus may further include a voice processor (not shown) and a data processor (not shown).

The demultiplexer 210 demultiplexes an input stream. For example, when an MPEG-2 TS is input, it may be demultiplexed and separated into video, audio, and data signals, respectively. Here, the stream signal input to the demultiplexer 210 may be a stream signal output from the tuner 110, the demodulator 120, or the external device interface unit 130.

The image processor 220 may perform image processing of the demultiplexed image signal. To this end, the image processor 220 may include an image decoder 225 and a scaler 235.

The image decoder 225 decodes the demultiplexed image signal, and the scaler 235 performs scaling to output the resolution of the decoded image signal on the display 180.

The video decoder 225 may include decoders of various standards.

For example, when the demultiplexed video signal is an encoded 2D video signal of MPEG-2 standard, it may be decoded by an MPEG-2 decoder.

Also, for example, the demultiplexed 2D video signal is a digital video broadcasting (DMB) method or a video signal of H.264 standard according to DVB-H, or a depth video of MPEC-C part 3 , Multi-view video according to Multi-view Video Coding (MVC) or free-view video according to Free-viewpoint TV (TV), respectively, decoded by H.264 decoder, MPEC-C decoder, MVC decoder or FTV decoder Can be.

Meanwhile, the image signal decoded by the image processor 220 may be classified into a case in which only a 2D image signal is present, a case in which a 2D image signal and a 3D image signal are mixed, and a case in which only a 3D image signal is present.

The image processor 220 may detect whether the demultiplexed video signal is a 2D video signal or a 3D video signal. Whether the image is a 3D image signal may be detected based on a broadcast signal received from the tuner 110, an external input signal from an external device, or an external input signal received through a network. In particular, whether the 3D video signal is a 3D video signal may be determined by referring to a 3D video flag, 3D video metadata, or 3D video format information in the header of the stream. You can judge.

The image signal decoded by the image processor 220 may be a 3D image signal having various formats. For example, the image may be a 3D image signal including a color image and a depth image, or may be a 3D image signal including a plurality of view image signals. The plurality of viewpoint image signals may include, for example, a left eye image signal and a right eye image signal.

The 3D video signal format may be determined according to a method of disposing a left eye image and a right eye image generated to implement a 3D image.

The 3D image may be composed of a multi-view image. The user may view the multi-view image through the left eye and the right eye. The user may feel a three-dimensional effect of the 3D image through the difference of the image detected through the left eye and the right eye. According to an embodiment of the present invention, a multi-view image for implementing a 3D image includes a left eye image that can be recognized by the user through the left eye and a right eye image that can be recognized through the right eye.

As shown in FIG. 3A, a method in which the left eye image and the right eye image are arranged left and right is referred to as a side by side format. As shown in FIG. 3B, a method of disposing the left eye image and the right eye image up and down is referred to as a top / down format. As shown in FIG. 3C, a method of time-divisionally arranging a left eye image and a right eye image is called a frame sequential format. As shown in FIG. 3D, a method of mixing the left eye image and the right eye image for each line is called an interlaced format. As shown in FIG. 3E, a method of mixing the left eye image and the right eye image for each box is called a checker box format.

The image signal included in the signal input to the image display apparatus 100 from the outside may be a 3D image signal capable of realizing a 3D image. In addition, the graphic user interface image signal generated to display the image display apparatus 100 related information or to input a command related to the image display apparatus 100 may be a 3D image signal. The formatter 260 may mix the 3D image signal and the graphic user interface 3D image signal included in the signal input to the image display apparatus 100 from the outside and output the mixed image to the display 180.

The OSD generator 240 generates an OSD signal according to a user input or itself. For example, a signal for displaying various types of information on a screen of the display 180 as a graphic or text may be generated based on a user input signal. The generated OSD signal may include various data such as a user interface screen, various menu screens, widgets, and icons of the image display apparatus 100. In addition, the generated OSD signal may include a 2D object or a 3D object.

The mixer 245 may mix the OSD signal generated by the OSD generator 240 and the decoded image signal processed by the image processor 220. In this case, the OSD signal and the decoded video signal may each include at least one of a 2D signal and a 3D signal. The mixed video signal is provided to the frame rate converter 250.

The frame rate converter 250 converts the frame rate of the input video. For example, a 60Hz frame rate is converted to 120Hz or 240Hz. When converting a frame rate of 60 Hz to 120 Hz, it is possible to insert the same first frame or insert a third frame predicted from the first frame and the second frame between the first frame and the second frame. When converting a frame rate of 60 Hz to 240 Hz, it is possible to insert three more identical frames or three predicted frames.

The formatter 260 may receive a mixed signal from the mixer 245, that is, an OSD signal and a decoded video signal, and separate the 2D video signal and the 3D video signal.

Meanwhile, in the present specification, a 3D video signal means a 3D object, and examples of such an object include a picture in picture (PIP) image (still image or a video), an EPG indicating broadcast program information, various menus, widgets, There may be an icon, text, an object in the image, a person, a background, a web screen (newspaper, magazine, etc.).

The formatter 260 may change the format of the 3D video signal. For example, it may be changed to any one of the various formats illustrated in FIG. 3. In particular, according to an embodiment of the present invention, changing from the format of the 3D video signal to the frame sequential format is taken as an example. That is, the left eye image signal L and the right eye image signal R are alternately arranged in sequence. Accordingly, the 3D image viewing apparatus described with reference to FIG. 1 is preferably a shutter glass 195.

4 illustrates an operation relationship between the shutter glass 195 and the frame sequential format.

4A illustrates that when the left eye image L is displayed on the display unit 180, the left eye glass of the shutter glass 195 is opened and the right eye glass is closed. When the right eye image R is displayed on the display unit 180, the left eye glass of the shutter glass 195 is closed and the right eye glass is opened. That is, the left and right eyeglasses of the shutter glass 195 are opened and closed in synchronization with the image displayed on the screen.

Meanwhile, the external device interface unit 130 may transmit / receive various data and signals with the shutter glass 195 according to various communication methods such as an RF (Radio Frequency) communication method and an infrared (IR) communication method.

Alternatively, according to the embodiment, the shutter glass 195 transmits / receives through a user input interface unit 150 having a transmitter / receiver capable of transmitting / receiving according to an IR standard and an RF standard, or separately from an image display device. Various data and signals can be transmitted and received through the transceiver.

The formatter 260 may convert a 2D video signal into a 3D video signal. For example, an edge or selectable object may be detected within the 2D image signal according to a 3D image generation algorithm, and an object or selectable object according to the detected edge may be separated into a 3D image signal and generated. Can be. In this case, the generated 3D image signal may be separated into a left eye image signal L and a right eye image signal R as described above.

The voice processing unit (not shown) in the controller 170 may perform voice processing of the demultiplexed voice signal. To this end, the voice processing unit (not shown) may include various decoders.

For example, if the demultiplexed speech signal is a coded speech signal, it can be decoded. Specifically, when the demultiplexed speech signal is an encoded speech signal of MPEG-2 standard, it may be decoded by an MPEG-2 decoder. In addition, when the demultiplexed speech signal is an encoded speech signal of MPEG 4 Bit Sliced Arithmetic Coding (BSAC) standard according to the terrestrial digital multimedia broadcasting (DMB) scheme, it may be decoded by an MPEG 4 decoder. In addition, when the demultiplexed speech signal is an encoded audio signal of the AAC (Advanced Audio Codec) standard of MPEG 2 according to the satellite DMB scheme or DVB-H, it may be decoded by the AAC decoder. In addition, when the demultiplexed speech signal is a encoded speech signal of the Dolby AC-3 standard, it may be decoded by the AC-3 decoder.

Also, the voice processing unit (not shown) in the controller 170 may process a base, a treble, a volume control, and the like.

The data processor (not shown) in the controller 170 may perform data processing of the demultiplexed data signal. For example, when the demultiplexed data signal is an encoded data signal, it may be decoded. The encoded data signal may be EPG (Electronic Progtam Guide) information including broadcast information such as a start time and an end time of a broadcast program broadcasted in each channel. For example, the EPG information may be TSC-PSIP (ATSC-Program and System Information Protocol) information in the ATSC scheme, and may include DVB-Service Information (DVB-SI) in the DVB scheme. . The ATSC-PSIP information or the DVB-SI information may be information included in the aforementioned stream, that is, the header (4 bytes) of the MPEG-2 TS.

Meanwhile, although FIG. 2 illustrates that the signals from the OSD generator 240 and the image processor 220 are mixed in the mixer 245 and then 3D processed in the formatter 260, the mixer is not limited thereto. May be located after the formatter. That is, the output of the image processor 220 is 3D processed by the formatter 260, and the OSD generator 240 performs 3D processing together with OSD generation, and then mixes each processed 3D signal by the mixer 245. It is also possible.

Meanwhile, a block diagram of the controller 170 shown in FIG. 2 is a block diagram for an embodiment of the present invention. Each component of the block diagram may be integrated, added, or omitted according to the specification of the controller 170 that is actually implemented.

In particular, according to an exemplary embodiment, the frame rate converter 250 and the formatter 260 may not be provided in the controller 170, but may be separately provided. In some embodiments, the frame rate converter 250 may be a formatter. 260 may be included.

5 is an internal block diagram of a shutter glass according to an embodiment of the present invention.

Referring to the drawings, the shutter glass according to the embodiment of the present invention is a receiving unit 510 for receiving a variety of data, such as a synchronization signal from the image display device, a control unit for controlling the opening and closing operation of the shutter glass based on the synchronization signal 520 and left and right eyeglasses 550 that are opened and closed under the control of the controller 520.

According to the exemplary embodiment, the apparatus may further include a frequency converter 530 capable of generating various signals or converting frequencies.

The receiver 510 receives a signal transmitted from the image display apparatus, and the controller 520 converts the received signal into a driving signal for controlling the left eye glass 551 and the right eye glass 552. In some cases, the received signal may be output as it is as a driving signal. Meanwhile, according to an embodiment, the apparatus may further include a Mux 540 for signal processing.

Meanwhile, according to the driving signal, the left and right eyeglasses 550 finally perform an on and off operation, that is, an opening and closing operation.

The image display apparatus may sequentially arrange the left eye image signal L and the right eye image signal R, and thus, when the left eye image L is displayed on the display unit 180, the left eye glass 551 may be used. Is open and the right eye glass 552 is closed. When the right eye image R is displayed, the left eye glass 551 is closed and the right eye glass 552 is opened. That is, the opening and closing operations of the left and right eye glasses 550 may be synchronized with an image displayed by the image display device.

On the other hand, when the left and right sync (L, R sync) information transmitted from the shutter glass is transmitted from a plurality of image display apparatuses or an electronic device transmitting information in a form similar to the transmitted information, one receiver of the shutter glass is used. A plurality of synchronization information may be received. Then, the left and right eyeglasses cannot be operated in synchronization with the image displayed on the image display apparatus, and thus, a user cannot view an accurate 3D image from the desired image display apparatus.

In addition, even when a signal-free state in which a signal from the image display device is not received correctly occurs, the user may not easily view the 3D image.

6 to 7 are diagrams showing an example of a signal for a shutter glass.

Referring to FIG. 6, a signal for a 3D image viewing apparatus, for example, a shutter glass, may be generated based on the vertical frequency V_sync of an image displayed on the image display apparatus. For example, the left and right eye images may be displayed by dividing the unit frame into a left eye image frame and a right eye image frame in half, and the left and right eye glasses may be opened and closed in synchronization with the left and right eye frames.

Meanwhile, the vertical frequency of the image may be set variously, such as 24 Hz, 50 Hz, 60 Hz.

However, when the right eye glass of the shutter glass is opened according to the response characteristic of the display unit 180, the display unit 180 is still displaying the left eye image frame, or the left and right eye glasses of the shutter glass are opened (on). The operation of closing (off) may include a rising and falling section due to the response speed of the shutter, etc. In view of this, when the right eye glass is quickly opened, the display unit 180 still displays the left eye image frame. Crosstalk may occur.

7 illustrates an example of a synchronization signal and a driving signal when the synchronization signal is normally received and when the synchronization signal is abnormally received.

Referring to FIG. 7A, a synchronization signal having synchronization information on an image displayed on an image display device may be received at a predetermined cycle. Since the synchronization signal is normally received without interference or noise, the driving signals of the left and right eye glasses are also correctly generated as shown in FIG. In the area indicated by L, the left eye glass is opened, and in the area indicated by R, the right eye glass is opened.

7 (c) is an example of a noise component into which a part not included in the synchronization signal of FIG. 7 (a) flows. The shutter glass may also determine that the introduced noise component is a valid synchronization signal, and an incorrect driving signal as shown in FIG. 7 (d) may be generated. Accordingly, the user may not watch the 3D image smoothly due to the opening of the right eye glass or the opening / closing operation of the left eye image on the image display device.

In addition, when a signal is not received by the shutter glass according to an external environment, the opening and closing operation may not be performed. Accordingly, the user may not be able to watch the 3D image smoothly because only one of the left eye glass or the right eye glass is kept open or the opening / closing operation is not performed even though the image displayed on the image display apparatus is being switched.

An image display apparatus according to an exemplary embodiment of the present invention capable of preventing such a crosstalk phenomenon or a non-operation outputs a reference signal smaller than a frequency of the synchronization signal based on a synchronization signal of a 3D image signal, and the reference signal. The shutter glass is opened based on the frequency of the signal, or the rising or falling edge of the received reference signal is detected to measure the frequency of the reference signal, and the shutter glass is opened based on the frequency of the reference signal. It includes.

That is, the reference signal is generated and output at a frequency different from that of the synchronization signal, and the shutter glass is opened based on the reference signal. Accordingly, by minimizing the influence of external noise and noise, and performing the shutter glass opening and closing operation by the reference signal even in the non-signal state according to the external environment, the operation state, etc., the user can watch the 3D image accurately and seamlessly.

8 is a flowchart illustrating a method of operating an image display device according to an exemplary embodiment of the present invention, and FIGS. 9 to 10 are views for explaining an operation method of the image display device of FIG. 8.

In the method of operating an image display apparatus according to an exemplary embodiment of the present invention, first, the controller 170 generates and outputs a reference signal based on a synchronization signal of the image signal, for example, a vertical synchronization signal Vsync. )

The transmitter (not shown) transmits the reference signal to the shutter glass 195 (S820).

The transmitting unit (not shown) of the image display device is included in the external device interface unit 130 described with reference to FIG. 1, and according to various communication methods such as a radio frequency (RF) communication method and an infrared (IR) communication method, shutter glasses ( 195) data and signals can be transmitted and received. Alternatively, depending on the embodiment, it may be included in the user input interface unit 150, or may be provided as a separate transceiver.

When the driving signal for the shutter glass is generated and transmitted by the control unit of the image display device as in the conventional method, an irregularly received noise component is also recognized as a signal for the shutter glass, and the shutter glass is applied to a signal including the received noise. There is a risk of opening and closing the left eye glass and the right eye glass on the basis. In addition, in the non-signal state in which a signal for the shutter glass is not received, the shutter glass may be in an inoperative state.

The present invention outputs and transmits a reference signal generated at a predetermined frequency, and the shutter of the shutter glass periodically detects an interval of the received reference signal to open and close the shutter glass based on the detected frequency. In addition, by generating a driving signal based on the most recent received signal, it is possible to operate independently even in a no signal state.

9 shows examples of reference signals.

9 (a) outputs the same signal as the drive signal as a reference signal, and pulses having a predetermined period T1 are regularly applied.

On the other hand, the frequency of the reference signal is preferably smaller than the frequency of the synchronization signal. The smaller frequency is the same as the interval between pulses and the longer period, so it is easy to detect a certain period, and the interval between pulses is wider, so there is an advantage that the noise component flowing between pulses can be easily determined. In addition, since the number of pulses within a predetermined time is small, the number of times of detecting a pulse required for frequency discrimination can be reduced.

On the other hand, the frequency of the synchronization signal is more preferably an integer multiple of the frequency of the reference signal. 9 (b) and 9 (c) show driving signals in which the frequency is reduced to one half and one quarter of the synchronization signal frequency in Fig. 9 (a), respectively.

Since the frequency and the period are inversely proportional, the period T2 of the drive signal of FIG. 9B becomes twice the period T1 of the drive signal of FIG. 9A, and the period T3 of the drive signal of FIG. 9C. ) Is four times the period T1 of the drive signal of Fig. 9A.

When the frequency of the synchronization signal and the frequency of the reference signal have a proportional and inverse relationship between a predetermined integer, the time for detecting the frequency of the reference signal and greatly generating a driving signal based on the frequency of the reference signal is greatly reduced. Can be.

Thereafter, the left eye glass and the right eye glass of the shutter glass are opened based on the frequency of the reference signal.

On the other hand, the shutter glass 195, the shutter unit for receiving the reference signal and the frequency of the reference signal detects the shutter glass control unit for generating a drive signal for controlling the opening and closing operation of the left eye glass and the right eye glass. 520 may include.

That is, the shutter glass 195 may open and close the left and right eye glasses according to the reference signal, generate a drive signal based on the frequency of the reference signal, and open and close the left and right eye glasses according to the generated drive signal.

Referring to FIG. 10, the frequency of the reference signal of FIG. 10 (a) is detected. Since pulses applied at equal intervals are normal reference signals, the intervals T4 and T5 between the pulses will be the same. Meanwhile, driving signals for opening and closing the left eye glass and the right eye glass as shown in FIG. 10 (b) are generated based on the frequency of the reference signal.

The shutter glass controller 520 may generate the driving signal by increasing the frequency of the reference signal. That is, if the period is long and the interval between pulses is wide, it is easy to detect the period and noise of the reference signal, and the reference signal may be generated by decreasing the frequency from the synchronization signal. Therefore, in the driving signal of the shutter glass, the frequency may be increased to restore the shape of the signal.

The shutter glass controller 520 may periodically update the driving signal. Referring to FIG. 10, the driving signal of the F1 period may be used only within the period, and then the driving signal of the updated F2 period may be used.

In order to correct an error caused by the passage of time of the driving signal, the driving signal may be newly generated and updated periodically, for example, every 1 second to several seconds.

Meanwhile, the shutter glass 195 may further include a frequency converter 530 capable of converting the frequencies of the various signals described above with reference to FIG. 5.

The frequency converter 530 may be, for example, a variable controlled oscillator circuit (Vcxo). Variable crystal oscillator circuits can generate clocks and signals, sample the signal, or vary the frequency of the signal.

On the other hand, the image display device may further include a frequency converter for converting the frequencies of the various signals described above with reference to FIG. That is, the frequency converter may be included as at least one block of the shutter glass 195, the transmitter of the image display device, and the controller according to an exemplary embodiment.

 In addition, the image display apparatus may periodically update the reference signal. In order to correct an error caused by the passage of time of the reference signal, a reference signal may be newly generated and updated periodically, for example, every 1 second to several seconds.

According to an exemplary embodiment, the shutter glass 195, in particular the shutter glass controller 520, detects a rising or falling edge of the reference signal received using an internal timer to detect the rising edge of the reference signal. Frequency can be measured. In addition, the left eye glass and the right eye glass may be opened and closed based on the frequency of the reference signal.

An image display apparatus according to an embodiment of the present invention outputs a reference signal smaller than a frequency of the synchronization signal based on the synchronization signal of the image signal, and opens or receives the shutter glass based on the frequency of the reference signal. And a shutter glass that detects a rising or falling edge of the reference signal to measure a frequency of the reference signal and opens based on the frequency of the reference signal.

According to the present invention, it is possible to prevent crosstalk and inaction, and to view 3D images more accurately and easily.

The image display apparatus and the operation method thereof according to the present invention are not limited to the configuration and method of the embodiments described above, but the embodiments may be applied to all or some of the embodiments May be selectively combined.

Meanwhile, the operation method of the image display apparatus of the present invention can be implemented as a code that can be read by a processor on a recording medium readable by a processor included in the image display apparatus. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor. Examples of the processor-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet. . The processor-readable recording medium can also be distributed over network coupled computer systems so that the processor-readable code is stored and executed in a distributed fashion.

In addition, while the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

100: video display device
170:
180: display unit
195: shutter glass
200: remote control device

Claims (17)

A controller which outputs a reference signal based on a synchronization signal of the video signal;
A transmitter for transmitting the reference signal; And,
And a shutter glass that receives the reference signal and has a left eye glass and a right eye glass that are opened based on a frequency of the reference signal.
And the frequency of the reference signal is smaller than the frequency of the synchronization signal. The method of claim 1,
The shutter glass,
A receiver which receives the reference signal; And
And a shutter glass controller configured to detect a frequency of the reference signal and generate a driving signal for controlling opening and closing of the left eye glass and the right eye glass. The method of claim 2,
The shutter glass controller generates the driving signal by increasing the frequency of the reference signal. The method of claim 2,
And the shutter glass controller periodically updates the driving signal. The method of claim 1,
And a frequency converter for converting the frequency of the synchronization signal. The method of claim 5,
And the frequency converter is a variable crystal oscillator circuit (Vcxo). A controller which outputs a reference signal based on a synchronization signal of the video signal;
A transmitter for transmitting the reference signal; And,
A shutter glass having a left eye glass and a right eye glass opened based on a frequency of the reference signal by detecting a rising or falling edge of the received reference signal and measuring the frequency of the reference signal; Display. The method of claim 7, wherein
The shutter glass,
A receiver which receives the reference signal; And
And a shutter glass controller configured to measure a frequency of the reference signal and generate a driving signal for controlling opening and closing operations of the left eye glass and the right eye glass. The method of claim 8,
And the shutter glass controller generates the driving signal to have a frequency greater than that of the reference signal. The method of claim 8,
And the shutter glass controller periodically updates the driving signal. The method of claim 7, wherein
And a frequency converter for converting the frequency of the synchronization signal. The method of claim 7, wherein
And the frequency converter is a variable crystal oscillator circuit (Vcxo). Generating a reference signal based on a synchronization signal of the video signal;
Transmitting the reference signal to a shutter glass; And,
And opening the left eye glass and the right eye glass of the shutter glass based on the frequency of the reference signal.
And the frequency of the reference signal is smaller than the frequency of the synchronization signal. The method of claim 13,
And detecting a frequency of the reference signal to generate a driving signal for controlling the opening / closing operation of the left eye glass and the right eye glass. The method of claim 14,
And a frequency of the driving signal is greater than a frequency of the reference signal. The method of claim 14,
And the driving signal is generated by converting a frequency of the synchronization signal. The method of claim 14,
Periodically updating the driving signal; and operating the image display device.

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