KR20120027820A - 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 vary the depth of 3D image APL(Average Pixel Level). CONSTITUTION: A control unit varies the depth of 3D image by a calculated APL(S925). The control unit alternatingly arranges a depth varied 3D image as a right eye image and a left eye image(S930). The control unit varies the gradation of the current frame image by the gradation difference between the current frame image and the previous frame image of the 3D image(S935). The control unit displays the current frame image with a varied gradation on a display(S940).

Description

Apparatus for displaying image and method for operating the same}

The present invention relates to an operation method of an image display apparatus, and more particularly, to an image display apparatus or an image display method capable of reducing cross talk.

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.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image display device and an operation method thereof capable of reducing cross talk.

Another object of the present invention is to provide an image display apparatus capable of varying gray scale according to a 3D image or a 2D image, and an operation method thereof.

Further, another object of the present invention is to provide an image display apparatus and a method of operating the same, which can vary the gray scale according to temperature.

According to an aspect of the present invention, there is provided a method of operating an image display apparatus, the method including receiving a 3D image, calculating an average image level of the 3D image, and calculating the 3D image according to the calculated average image level. Varying the depth of the image.

In addition, the operation method of the image display apparatus according to an embodiment of the present invention for achieving the above object, receiving the 3D image, calculating the average image level of the 3D image, and according to the calculated average image level Varying the gradation of the 3D image, varying the gradation of the current frame image according to the gradation difference between the current frame image and the previous frame image of the 3D image, and displaying the gradation-variable current frame image. It includes a step.

In addition, the image display apparatus according to an embodiment of the present invention for achieving the above object, the average image level calculation unit for calculating the average image level of the input 3D image, and the depth of the 3D image according to the calculated average image level And a display for displaying a variable formatter and a 3D image having a variable depth.

According to an embodiment of the present invention, crosstalk can be reduced by varying the depth according to the APL of the 3D image.

In addition, by using overdriving, the gradation can be adaptively changed, and blurring can be prevented.

On the other hand, when the image display apparatus uses a hold type liquid crystal panel, crosstalk can be reduced by increasing the frame rate and alternately aligning the left eye image frame and the right eye image frame during 3D image display.

1 is a block diagram illustrating an image display apparatus according to an exemplary embodiment of the present invention.
FIG. 2 is a diagram illustrating an example of an interior of a power supply unit and a display of FIG. 1.
3 is a diagram illustrating a gradation variable part according to an exemplary embodiment of the present invention.
4 is an internal block diagram of the controller of FIG. 1.
5 is a diagram illustrating various formats of a 3D image.
6 is a diagram illustrating an operation of a 3D viewing apparatus according to the format of FIG. 5.
FIG. 7 is a diagram illustrating an image formed by a left eye image and a right eye image.
8 is a diagram illustrating depth of a 3D image according to a distance between a left eye image and a right eye image.
9 is a flowchart illustrating a method of operating an image display apparatus according to an exemplary embodiment.
10 to 22 are views referred to for describing various examples of an operating method of the image display apparatus of FIG. 9.

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

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 is a block diagram illustrating an image display apparatus according to an exemplary 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, a user input interface unit 150, a controller 170, a display 180, an audio output unit 185, a power supply unit 190, and a 3D viewing device 195.

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 180 and outputs 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 with the 3D viewing device 195.

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 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. 4.

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 may output the channel information selected by the user together with the processed video or audio signal through the display 180 or the audio output unit 185.

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. The video signal or the audio signal may be output through the display 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 180.

In this case, the image displayed on the display 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 different depth than the image displayed on the display 180. [ Preferably, the 3D object may be processed to appear protruding from the image displayed on the display 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 180 by 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 180 or in an overall viewing manner displayed in most regions of the display 180.

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

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

The display 180 may be divided into an additional display method and a single display method for viewing a 3D image.

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

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

In an embodiment of the present invention, the 3D viewing apparatus 195 is provided for viewing 3D images. The 3D viewing apparatus 195 is assumed to be an active display additional display among the various types described above. Hereinafter, the description will be based on the shutter glass.

The display 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 voice 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 180 for displaying an image, and an audio output unit 185 for audio output. have.

The remote control apparatus 200 transmits the user input to the user input interface unit 150. To this end, the remote control apparatus 200 can use Bluetooth, RF (radio frequency) communication, infrared (IR) communication, UWB (Ultra Wideband), ZigBee, or 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.

Hereinafter, the image display apparatus 100 according to the embodiment of the present invention is capable of a three-dimensional display, and will be described based on a liquid crystal display panel (LCD panel) based display that requires a separate backlight unit.

FIG. 2 is a diagram illustrating an example of an interior of a power supply unit and a display of FIG. 1.

Referring to the drawings, a liquid crystal display panel (LCD panel) based display 180 includes a liquid crystal panel 210, a driving circuit unit 230, and a backlight unit 250.

In order to display an image, the liquid crystal panel 210 includes a plurality of gate lines GL and data lines DL intersected in a matrix, and a thin film transistor and pixel electrodes connected thereto are formed in the crossing regions. A first substrate, a second substrate with a common electrode, and a liquid crystal layer formed between the first substrate and the second substrate.

The driving circuit unit 230 drives the liquid crystal panel 210 through a control signal and a data signal supplied from the controller 170 of FIG. 1. To this end, the driving circuit unit 230 includes a timing controller 232, a gate driver 234, and a data driver 236.

The timing controller 232 receives a control signal from the control unit 170, an R, G, B data signal, a vertical synchronization signal Vsync, and the like, and responds to the control signal with the gate driver 234 and the data driver 236. ), The R, G, and B data signals are rearranged and provided to the data drive 236.

The timing controller 232 may include a gradation variable unit 300 that varies the gradation of the current frame image according to the gradation difference between the current frame image and the previous frame image of the input image. For example, the gray level of the R, G, B data signal of the current frame image is adjusted according to the gray level difference of the R, G, B data signal of the current frame image and the gray level of the R, G, B data signal of the previous frame image. Can be variable. This will be described later with reference to FIG. 3 and the like.

Meanwhile, under the control of the gate driver 234, the data driver 236, and the timing controller 232, the scan signal and the image signal are supplied to the liquid crystal panel 210 through the gate line GL and the data line DL. do.

The backlight unit 250 supplies light to the liquid crystal panel 210. To this end, the backlight unit 250 includes a plurality of backlight lamps 252, which are light sources, a scan driver 254 that controls scanning driving of the backlight lamp 252, and a backlight lamp 252 on / off. It may include a lamp driver 256 to turn off (Off).

When a plurality of backlight lamps (not shown) are turned on, a diffuser plate (not shown) for diffusing light from the lamp, a reflector plate (not shown) for reflecting light, and an optical sheet (not shown) for polarizing, point light, and diffusing light The light is irradiated onto the entire surface of the liquid crystal panel 210 by using the?

The plurality of backlight lamps (not shown) may be disposed on the rear surface of the liquid crystal panel 210, and in particular, may be sequentially disposed. This is called a direct type. On the other hand, a plurality of backlight lamps (not shown) may be disposed on the rear surface of the liquid crystal panel 210, in particular, above and below the liquid crystal panel 210. This is called an edge type.

Meanwhile, the plurality of backlight lamps (not shown) may be turned on at the same time or may be sequentially driven for each block. In addition, the plurality of backlight lamps (not shown) may be a backlight lamp of a light emitting diode (LED) type.

A predetermined image is displayed using light emitted from the backlight unit 250 in a state in which light transmittance of the liquid crystal layer is controlled by an electric field formed between the pixel electrode and the common electrode of the liquid crystal panel 210.

The power supply unit 190 may supply the common electrode voltage Vcom to the liquid crystal panel 210 and supply the gamma voltage to the data driver 236. In addition, the driving power for driving the backlight lamp 252 is supplied to the backlight unit 250.

3 is a diagram illustrating a gradation variable part according to an exemplary embodiment of the present invention.

Referring to the drawings, the gradation variable part 300 according to an embodiment of the present invention may be provided in the timing controller 232, but is not limited thereto and may be provided in front of the timing controller 232. In the following description, it is assumed that the timing controller 232 is provided.

The gradation variable unit 300 varies the gradation of an input video. To this end, the gradation variable unit 300 includes a lookup table 310, a frame buffer 320, and a gradation setting unit 330.

The lookup table 310 stores OD data set based on the gradation of the current frame image and the gradation of the previous frame image. For example, when the gray level of the current frame image and the previous frame image are the same, the set gray level also has the same gray level. As another example, when the gradation of the current frame image is larger than the gradation of the previous frame image, the set gradation may be larger than the gradation of the current frame image. This will be described later with reference to FIG. 19.

On the other hand, the set gradation data (OD data) set in the lookup table 310 is transmitted from the control unit 170 or the storage unit 140 to the set gradation stored separately in the control unit 170 or the storage unit 140, and the gradation variable unit. It may be received at the lookup table 310 in the (300).

On the other hand, the setting grayscale data LUT in the lookup table 310 may be input to the grayscale setting unit, and may be used when grayscale setting.

The frame buffer 320 stores the current frame image frame_c received from the controller 170. In addition, the previous frame image (frame_b) is also stored. The frame buffer 320 provides the previous frame image frame_b to the gray scale setting unit 330.

For example, when the input image is a 3D image, the frame buffer 320 may store left and right eye images aligned by the formatter 460 in the controller 170, respectively.

The gray level setting unit 330 may change the gray level of the current frame image by using the set gray level data LUT in the current frame image frame_c, the previous frame image frame_b, and the lookup table 310.

The gray level setting unit 330 may vary the gray level of the current frame image differently according to the frame rate of the current frame image frame_c. For example, as the frame rate of the current frame image frame_c increases, the magnitude of the gray scale change amount of the variable gray scale may be larger.

The gray scale setting unit 330 may vary the gray scale of the current frame image according to the temperature in the image display apparatus 100 or the temperature of the surroundings. For example, the lower the temperature, the larger the magnitude of gray scale variation of the variable gray scale.

Meanwhile, the current frame image frame_v having the variable gray level may be rearranged in the timing controller 232. That is, the R, G, and B data signals of the current frame image frame_v having the variable gray level may be rearranged and provided to the data drive 236.

4 is an internal block diagram of the controller of FIG. 1, FIG. 5 is a diagram illustrating various formats of a 3D image, and FIG. 6 is a diagram illustrating an operation of a 3D viewing apparatus according to the format of FIG. 5.

Referring to the drawings, the control unit 170 according to an embodiment of the present invention, the demultiplexer 410, the image processor 420, the OSD generator 440, the mixer 445, the frame rate converter 450, an APL operator 455, and a formatter 460. In addition, the apparatus may further include a voice processor (not shown) and a data processor (not shown).

The demultiplexer 410 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 410 may be a stream signal output from the tuner 110, the demodulator 120, or the external device interface unit 130.

The image processor 420 may perform image processing of the demultiplexed image signal. To this end, the image processor 420 may include an image decoder 425 and a scaler 435.

The image decoder 425 decodes the demultiplexed image signal, and the scaler 435 performs scaling to output the resolution of the decoded image signal on the display 180.

The video decoder 425 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 420 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 exists.

The image processor 420 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 420 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.

Here, the format of the 3D video signal is a side by side format (FIG. 5A) in which the left eye video signal L and the right eye video signal R are arranged left and right, as shown in FIG. Frame Sequential format (FIG. 5B), Top / Down format (FIG. 5C) arranged up and down, and Interlaced format for mixing a left eye image signal and a right eye image signal line by line (FIG. 5B). 5d), a checker box format (FIG. 5E) for mixing the left eye image signal and the right eye image signal for each box.

The OSD generator 440 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 445 may mix the OSD signal generated by the OSD generator 440 and the decoded image signal processed by the image processor 420. 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 450.

The frame rate converter 450 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.

An average image level calculating unit (APL calculating unit) 455 calculates an average image level (APL) of the input video. In particular, in accordance with an embodiment of the present invention, the average image level of the 3D image is calculated. Higher APL means higher average picture level, and lower APL means lower average picture level. The image level at this time may be data indicating luminance. Also, the APL may be an average picture level per unit frame. Therefore, when APL is high, it may mean that the average brightness per unit frame is high.

The formatter 460 may receive a mixed signal from the mixer 445, 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 460 may change the format of the 3D video signal. For example, regardless of the format of the input 3D video signal, it may be changed to any one of various formats illustrated in FIG. 5. Accordingly, according to the format, the operation of the 3D viewing apparatus may be performed as shown in FIG. 6.

First, FIG. 6A illustrates an operation of the shutter glass 195 when the formatter 460 outputs the frame sequential format among the formats of FIG. 5.

That is, when the left eye image L is displayed on the display 180, the left eye glass of the shutter glass 195 is opened and the right eye glass is closed. FIG. 6B illustrates the left eye glass of the shutter glass 195. Closes and the right eye glass is opened.

6B illustrates the operation of the polarizing glass 195 when the formatter 460 outputs the side by side format of the format of FIG. 5. The polarizing glass 195 is passive, so that both the left eye glass and the right eye glass remain open.

The formatter 460 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.

Meanwhile, the formatter 460 may vary the depth according to the APL calculated by the APL calculator 455. To this end, the parallax (distance) between the left eye image and the right eye image may be adjusted. In particular, when the APL is less than or equal to the first predetermined value Low_th, the depth is set to be small. If the APL is equal to or larger than the second predetermined value High_th, the depth is set to be small. This will be described later with reference to FIG. 9 or below.

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 ATSC-PSIP (ATSC-Program and System Information Protocol) information in the case of the ATSC scheme, and may include DVB-Service Information (DVB-SI) in the case of 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.

In FIG. 4, although the signals from the OSD generator 440 and the image processor 420 are mixed by the mixer 445, the formatter 460 performs 3D processing, but the present invention is not limited thereto. May be located after the formatter. That is, the output of the image processor 420 is 3D processed by the formatter 460, and the OSD generator 440 performs 3D processing together with OSD generation, and then mixes each processed 3D signal in the mixer 445. It is also possible.

On the other hand, a block diagram of the controller 170 shown in Figure 4 is a block diagram for one 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, the frame rate converter 450 and the formatter 460 may not be provided in the controller 170, but may be provided separately.

FIG. 7 is a diagram illustrating an image formed by a left eye image and a right eye image, and FIG. 8 is a diagram illustrating a depth of a 3D image according to an interval between a left eye image and a right eye image.

First, referring to FIG. 7, a plurality of images or a plurality of objects 715, 725, 735, and 745 are illustrated.

First, the first object 715 includes a first left eye image 711 and L based on the first left eye image signal and a first right eye image 713 and R based on the first right eye image signal. An interval between the first left eye images 711 and L and the first right eye images 713 and R is illustrated to be d1 on the display 180. In this case, the user recognizes that the image is formed at an intersection point of the extension line connecting the left eye 701 and the first left eye image 711 and the extension line connecting the right eye 703 and the first right eye image 703. Accordingly, the user recognizes that the first object 715 is located behind the display 180.

Next, since the second object 725 includes the second left eye images 721 and L and the second right eye images 723 and R, the second object 725 overlaps each other and is displayed on the display 180. do. Accordingly, the user recognizes that the second object 725 is positioned on the display 180.

The third object 735 and the fourth object 745 are the third left eye images 731 and L, the second right eye images 733 and R, the fourth left eye images 741 and L and the fourth object, respectively. The right eye image 743 and R are included, and the intervals are d3 and d4, respectively.

According to the above-described method, the user recognizes that the third object 735 and the fourth object 745 are located at the positions where the images are formed, respectively, and in the figure, each of them is located in front of the display 180.

In this case, it is recognized that the fourth object 745 is protruded earlier, that is, more protruding than the third object 735, which is the distance between the fourth left eye images 741 and L and the fourth right eye images 743 and R. d4) is larger than the distance d3 between the third left eye images 731 and L and the third right eye images 733 and R.

Meanwhile, in the exemplary embodiment of the present invention, the distance between the display 180 and the objects 715, 725, 735, and 745 recognized by the user is expressed as a depth. Accordingly, the depth when the user is recognized as if it is located behind the display 180 has a negative value (-), and the depth when the user is recognized as if it is located before the display 180. (depth) is assumed to have a negative value (+). That is, the greater the degree of protrusion in the direction of the user, the greater the size of the depth.

Referring to FIG. 8, the distance a between the left eye image 801 and the right eye image 802 of FIG. 8A is the distance between the left eye image 801 and the right eye image 802 shown in FIG. 8B. When (b) is smaller, it can be seen that it is smaller than the depth b 'of the 3D object of FIG. 8 (b) than the depth a' of the 3D object of FIG.

As such, when the 3D image is exemplified as the left eye image and the right eye image, a position recognized as image formation from the user's point of view varies depending on the distance between the left eye image and the right eye image. Therefore, by adjusting the display interval of the left eye image and the right eye image, it is possible to adjust the depth of the 3D image or 3D object composed of the left eye image and the right eye image.

9 is a flowchart illustrating a method of operating an image display apparatus according to an exemplary embodiment, and FIGS. 10 to 22 are views for explaining various examples of the method of operating the image display apparatus of FIG. 9.

Referring to FIG. 9, first, a 3D image is received (S910). An image input to the image display apparatus 100 may be, for example, a broadcast image from a broadcast signal received by the tuner 110, an external input image from an external device, an image stored in the storage 140, or a network. It may be an image input from a content provider.

Meanwhile, when information or a flag indicating whether the image is a 3D image is provided in the stream including the image, the controller 170 obtains such information or flag during demultiplexing or decoding, and inputs the image. It may be determined whether the image is a 3D image.

When the input image is a multi-view image, the controller 170 may determine whether the input image is a 3D image by checking whether the input image includes a left eye image and a right eye image.

Next, an average image level of the 3D image is calculated (S915). The control unit 170 calculates an average image level (APL) of the input 3D image. Specifically, the APL calculating unit 455 in the control unit 170 may calculate the average image level of the 3D image. have.

Higher APL means higher average picture level, and lower APL means lower average picture level. The image level at this time may be data indicating luminance. Also, the APL may be an average picture level per unit frame. Therefore, when APL is high, it may mean that the average brightness per unit frame is high.

The brightness of the screen according to the APL is illustrated in FIGS. 12, 14, and 16, respectively, which will be described later.

Next, the frame rate of the 3D image is converted (S920). The depth of the 3D image is varied according to the calculated average image level (S925). The depth-variable 3D image is alternately aligned to the left eye image and the right eye image (S930). The gray level of the current frame image is varied according to the gray level difference between the current frame image and the previous frame image of the input 3D image (S935). In operation S940, the current frame image of the variable gray scale is displayed.

10A illustrates image frames of a 3D image processed by the image processor 420. In this case, it can be seen that the format of the 3D image frame 1010 is a top / down format (see FIG. 5B).

Next, in operation S920, the frame rate converter 450 converts the frame rate of the 3D image. For example, a 60 Hz frame rate is converted to 120 Hz or 240 Hz.

FIG. 10B illustrates that the frame rate converter 450 increases the frame rate of the 3D image. The frame rate converter 450 may increase the frame rate by repeatedly inserting the 3D image frame 1020. At this time, the format of the 3D image is maintained as the top-down format.

10B illustrates an example in which the frame rate is increased by four times, but is not limited thereto, and may be increased by various settings such as two times. On the other hand, frame rate conversion may be selectively performed.

Next, in operation 925, the formatter 460 varies the depth of the 3D image according to the APL calculated by the APL calculator 420.

11 illustrates a graph for the calculated APL and set depth.

For example, the formatter 460 has a small depth of the 3D image when the APL is smaller than or equal to the first predetermined value Low_th or greater than or equal to the second predetermined value HIgh_th larger than the first predetermined value Low_th. Signal processing can be performed.

In particular, when the depth is variable, the formatter 460 may set the depth of the 3D image to become smaller as the lower limit (eg, 0) is calculated when the calculated APL is less than or equal to the first predetermined value Low_th.

In addition, the formatter 460 may set the depth of the 3D image to become smaller as the upper limit value increases when the calculated APL is greater than or equal to the second predetermined value HIgh_th.

Performing the variable depth of the 3D image according to the calculated APL is related to over driving of the liquid crystal panel described later with reference to FIG. 18.

Briefly, in order to improve the response speed of the liquid crystal panel, as shown in FIG. 18, in the state in which the overdriving driving applying the additional voltage or the additional tone is performed, as shown in FIG. Gray scale) or low gray scale (eg, zero gray scale), overdriving may not be performed, and a limit in which data is displayed in 256 gray scales or zero gray scales may occur. This phenomenon can occur in both 2D image display or 3D image display.

In particular, when displaying a 3D image, a crosstalk phenomenon, which is a stacking phenomenon between the left eye image and the right eye image, is highly likely due to the slow response speed of the liquid crystal panel, and thus the stereoscopic effect is halved.

In the embodiment of the present invention, in order to minimize this, it is proposed to vary the depth according to the APL calculated by the APL operation unit 455.

In particular, as described above with reference to FIG. 11, when the APL is less than or equal to the first predetermined value Low_th or greater than or equal to the second predetermined value HIgh_th because the overdriving is difficult to be performed properly and the crosstalk characteristic is not good, the depth of the 3D image is increased. It is desirable to vary the depth. In particular, it is preferable to reduce the depth of the set 3D image and perform signal processing to be smaller. Accordingly, crosstalk characteristics are improved when displaying 3D images.

Meanwhile, the depth variable signal processing of the 3D image will be described later in detail with reference to FIGS. 12 to 17.

Next, in operation S930, the formatter 460 alternately arranges the 3D image into a left eye image and a right eye image. That is, it converts to the frame sequential format illustrated in FIG.

10 (c) and 10 (d) illustrate an example of converting, by the formatter 460, the format of the 3D video frame, which has been frame rate converted by the frame rate converter 450, into a 3D video frame having a frame sequential format. do.

FIG. 10C illustrates a first left eye video frame L1 1030, a first left eye video frame L1, a first right eye video frame R1, a first right eye video frame R1, and FIG. The second left eye image frame L2 may be arranged in order. That is, the same left eye image frame is continuously arranged, after which the same right eye image frame is continuously arranged.

10 (d) shows a first left eye image frame (L1) 1030, a black frame 1040, a first right eye image frame R1, a black frame, and a second left eye image frame L2 as shown in FIG. 10. ), And so on. That is, a black frame is arranged between the left eye image frame and the right eye image frame.

As such, when the left eye image frame and the right eye image frame are alternately arranged in the formatter 460, the respective frames are input to the display 180.

12-17 illustrate various examples of varying depth according to APL.

First, FIG. 12 illustrates that the APL values of the left eye image 1210 and the right eye image 1220 are equal to or less than the first predetermined value Low_th, as shown in FIG. 11.

First, the left eye image 1210 and the right eye image 1225 include 3D objects 1215 and 1225, respectively. In response to the parallax L1 of the 3D object 1215 in the left eye image 1210 and the 3D object 1225 in the right eye image 1220, when the 3D viewing apparatus is worn, as shown in FIG. ), The image 1310 and the 3D object 1315 having a predetermined depth d1 are displayed.

As described above, the formatter 460 varies the depth. That is, as shown in FIG. 12, the parallax L2 of the 3D object 1235 in the left eye image 1210 and the 3D object 1245 in the right eye image 1220 is reduced.

Accordingly, when the 3D viewing apparatus is worn, as shown in FIG. 13B, an image 1310 and a 3D object 1325 having a reduced depth d2 are displayed on the display 180.

On the other hand, the APL values of the left eye image 1210 and the right eye image 1220 are equal to or less than the first predetermined value Low_th, and the formatter 460 moves to the left eye image 1210 as the lower limit value (for example, 0) is reached. The parallax between the 3D object 1235 and the 3D object 1245 in the right eye image 1220 may be gradually reduced. Accordingly, the depth of the displayed 3D object becomes smaller and smaller.

Next, FIG. 14 illustrates that the APL values of the left eye image 1410 and the right eye image 1420 are larger than the first predetermined value Low_th and smaller than the second predetermined value High_th, as shown in FIG. 11. do.

First, the left eye image 1410 and the right eye image 1425 include 3D objects 1415 and 1425, respectively. In response to the parallax L3 of the 3D object 1415 in the left eye image 1410 and the 3D object 1425 in the right eye image 1420, when the 3D viewing apparatus is worn, as shown in FIG. ), The image 1510 and the 3D object 1515 having a predetermined depth d3 are displayed.

As described above, the formatter 460 varies the depth. That is, as shown in FIG. 14, the parallax L4 of the 3D object 1435 in the left eye image 1410 and the 3D object 1445 in the right eye image 1420 is reduced.

Therefore, when the 3D viewing apparatus is worn, the image 1510 and the 3D object 1525 having the reduced depth d4 are displayed on the display 180 as shown in FIG. 15B.

On the other hand, compared with the 3D object 1525 of FIG. 13B, it can be seen that the depth d4 is larger.

On the other hand, unlike the drawing, when the APL values of the left eye image 1410 and the right eye image 1420 are larger than the first predetermined value Low_th and smaller than the second predetermined value High_th, as shown in FIG. 11. It is also possible to display the set depth as it is, without an additional depth variable step. That is, as shown in FIG. 15A, the image 1510 and the 3D object 1515 having a predetermined depth d3 may be displayed on the display 180 as it is.

Next, FIG. 16 illustrates that the APL values of the left eye image 1610 and the right eye image 1620 are greater than or equal to a second predetermined value High_th as shown in FIG. 11.

First, the left eye image 1610 and the right eye image 1625 respectively include 3D objects 1615 and 1625. In response to the parallax L5 of the 3D object 1615 in the left eye image 1610 and the 3D object 1625 in the right eye image 1620, when the 3D viewing apparatus is worn, as shown in FIG. ), The image 1710 and the 3D object 1715 of a predetermined depth d5 are displayed.

As described above, the formatter 460 varies the depth. That is, as shown in FIG. 16, the parallax L6 of the 3D object 1635 in the left eye image 1610 and the 3D object 1645 in the right eye image 1620 is reduced.

Therefore, when the 3D viewing apparatus is worn, as shown in FIG. 17B, an image 1710 and a 3D object 1725 having a reduced depth d6 are displayed on the display 180.

On the other hand, the APL values of the left eye image 1610 and the right eye image 1620 are equal to or greater than the second predetermined value High_th, and as the upper limit value increases, the formatter 460 is connected to the 3D object 1635 in the left eye image 1610. The parallax of the 3D object 1645 in the right eye image 1620 may be gradually reduced. Accordingly, the depth of the displayed 3D object becomes smaller and smaller.

18 is a diagram referred to for description of overdriving used when driving a liquid crystal panel.

As described above, the liquid crystal panel 210 has characteristics of a response speed and a hold type of the liquid crystal, and thus a cross talk phenomenon occurs while the upper and lower display points of the liquid crystal panel 210 are delayed. .

FIG. 18A illustrates normal driving of the liquid crystal panel, and FIG. 18B illustrates over driving.

18 (a) shows the liquid crystal response speed L according to the voltage V applied to the liquid crystal panel. That is, when a first voltage V1 is applied during a predetermined frame and a second voltage V2 higher than the first voltage V1 is instantaneously applied, according to a slow response speed of the liquid crystal, the second voltage V2 is applied. It does not immediately react to, but has a transition period like the first period T1 as shown in the figure. This transition period becomes longer as the difference Vd1 between the first voltage V1 and the second voltage V2 increases. As a result, a motion blurring phenomenon in which the screen is blurred in a video occurs. In addition, when the 3D image is implemented, a crosstalk phenomenon, which is an image overlapping phenomenon between the left eye image and the right eye image, is generated.

In order to prevent this, an embodiment of the present invention applies overdriving, as shown in FIG.

18 (b) shows the liquid crystal response speed L according to the voltage V applied to the liquid crystal panel. That is, while the first voltage V1 is applied during the predetermined frame, and before the second voltage V2 higher than the first voltage V1 is instantaneously applied, the third voltage V3 higher than the second voltage V2 is applied. Is instantaneously applied to improve the slow response speed of the liquid crystal.

In the figure, it can be seen that the transition period is a second period T2 that is significantly reduced compared to the first period T1 of FIG. 18A. In order to shorten the transition period, it is preferable to further increase the level of the third voltage V3. That is, the larger the difference Vd2 between the second voltage V2 and the third voltage V3, the shorter the transition period.

On the other hand, since the applied voltage in FIG. 18 is applied in proportion to the gray level of the frame image, the following description will focus on the gray instead of the applied voltage. That is, in the embodiment of the present invention, the gray level of the frame image is varied for overdriving. This will be described later with reference to FIG. 19.

Next, in operation S935, after the left eye image and the right eye image of the 3D image are alternately aligned (S930), the controller 170 or the storage 140 may vary the gray level in the timing controller 232. The grayscale data (OD data) corresponding to the 3D image may be transmitted to the unit 300. As described above with reference to FIG. 3, the lookup table 310 stores predetermined grayscale data (OD data) based on the grayscale of the current frame image and the grayscale of the previous frame image.

The gray scale setting unit 330 in the gray scale variable unit 300 may present the current frame image frame_c of the input image and the gray scale difference between the previous frame image frame_b stored in the frame buffer 320. The gray level of the frame image is varied.

For example, referring to FIG. 19, when the gray level of the previous frame image is 64 and the gray level of the current frame image is 128, the set gray level may be 139 larger than 128 gray levels. In this way, by increasing the gray scale change amount and overdriving, it is possible to prevent a crosstalk phenomenon that may occur during 3D image display.

As another example, referring to FIG. 19, when the gray level of the previous frame image is 128 and the gray level of the current frame image is 64, the set gray level may be 53 smaller than 64 gray levels.

Meanwhile, as described above, when the gray level of the current frame image is 256, which is the maximum gray level, it is set to 256 regardless of the gray level of the previous frame image, and when the gray level of the current frame image is 0, which is the lowest gray level, the previous frame image It can be seen that it is set to 0 regardless of the gradation of.

20 illustrates an example of grayscale Ga of the input image during overdriving. That is, when the first grayscale G1 is applied during the predetermined frame and the second grayscale G2 higher than the first grayscale G1 is set, the third grayscale higher than the second grayscale G2 for overdriving. (G3) can be set. In other words, the gray scale change amount Gd2 between the second grayscale G2 and the third grayscale G3 is set to be large.

Meanwhile, as the gray level difference GD1 between the first gray level G1 and the second gray level G2 increases, the third gray level G3 of FIG. 20A may be set larger. Thereby, overdriving can be performed more efficiently. As such, by increasing the gray scale change amount and overdriving, it is possible to prevent the crosstalk phenomenon during the 3D video display.

21 shows another example of the grayscale Gb of the input image during overdriving. That is, when the fifth grayscale G5 is applied during the predetermined frame and the sixth grayscale G6 lower than the fifth grayscale G5 is set, the seventh lower than the sixth grayscale G6 for overdriving. The gray level G7 can be set. In other words, the gray scale change amount Gd5 between the sixth grayscale G6 and the seventh grayscale G7 is set to be large.

Meanwhile, as the gray level difference GD4 between the fifth grayscale G5 and the sixth grayscale G6 increases, the seventh grayscale G7 of FIG. 21A may be set smaller. Thereby, overdriving can be performed more efficiently.

The gray level setting unit 330 may vary the gray level of the current frame image differently according to the frame rate of the current frame image frame_c. For example, as the frame rate of the current frame image frame_c increases, the magnitude of the gray scale change amount of the variable gray scale may be larger.

Meanwhile, in operation S940, the current frame image having a variable gray level is displayed. For example, in the case of a 3D image that is variable in depth according to ASL, the left eye image is displayed first and the right eye image is displayed thereafter according to the frame sequential format. To this end, the backlight lamp 252 is turned on in synchronization with sequentially aligned left eye images and right eye images. In addition, when the above-described gray scale variable is performed, the left-eye image subjected to the gray scale variable is displayed first, and then the right eye image is displayed thereafter.

Referring to FIG. 22, as illustrated in FIG. 10C, in the state in which the formatter 460 is aligned with the left eye image frame and the right eye image frame, the backlight lamp 252 is synchronized with the left eye image frame and the right eye image frame, respectively. Turn on).

FIG. 22A illustrates a vertical synchronization frequency Vsync indicating a display time point of each frame. FIG. 22B illustrates that the backlight lamp 252 is operated when each frame is input to the liquid crystal panel 210. It turns on in synchronization with the left eye image frame and the right eye image frame.

FIG. 22B illustrates a backlight lamp 252 and a liquid crystal panel disposed above the liquid crystal panel 210 during a portion of a left eye image frame that is continuously arranged or a portion of a right eye image frame that is continuously disposed. An example of turning on the backlight lamp 252 disposed under the 210 is illustrated. By such driving, the crosstalk phenomenon in which adjacent images (left eye image and right eye image) are overlapped and recognized during 3D image display is reduced. In addition, the cross talk phenomenon is reduced by the above-described variable depth or gradation variable driving according to ASL.

Meanwhile, FIG. 22B illustrates turning on the backlight lamp 252 disposed above the panel first, and turning on the backlight lamp 252 disposed below the panel later.

Referring to the drawings, when the backlight lamp 252 disposed on the upper side of the panel is turned on, it shows that light is transmitted and displayed from the upper side to the center of the panel, and the backlight lamp 252 disposed below the panel is turned on. In this case, the light is transmitted from the lower side of the panel to the center part and is displayed.

Meanwhile, FIG. 22C shows the turn on / turn off timing of the backlight lamp 252. In the drawing, it is assumed that the backlight lamp 252 is turned on at a high level.

Meanwhile, FIG. 22 (d) shows the operation signal timing of the shutter glass 195. According to the operation signal timing of the shutter glass 195, only the left eye glass is opened when the left eye image frames L1, L2, and L3 are displayed, and only the right eye glass is opened when the right eye image frames R1, R2, and R3 are displayed. do.

On the other hand, when displaying a 3D image, by displaying a backlight in each of the left eye image frame and the right eye image frame, crosstalk can be reduced.

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, although the preferred embodiment of the present invention has 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.

Claims (17)

Receiving a 3D image;
Calculating an average image level of the 3D image; And
And varying the depth of the 3D image in accordance with the calculated average image level. The method of claim 1,
The depth variable step,
The depth of the 3D image is set to be smaller when the calculated average image level is less than or equal to a first predetermined value or when the calculated average image level is greater than or equal to a second predetermined value larger than the first predetermined value. Operation method of display device. The method of claim 1,
The depth variable step,
And when the calculated average image level is less than or equal to a first predetermined value, setting the depth of the 3D image to decrease as the lower limit value is reached. The method of claim 1,
The depth variable step,
And if the calculated average image level is equal to or greater than a second predetermined value, setting the depth of the 3D image to decrease as the upper limit value increases. The method of claim 1
Displaying the depth-variable 3D image; and operating the image display device. The method of claim 1,
Converting a frame rate of the received 3D image;
The depth variable step,
And operating the frame rate converted 3D image based on the frame rate converted 3D image. The method of claim 1
And varying the gradation of the current frame image according to the gradation difference between the current frame image and the previous frame image of the depth-variable 3D image. The method of claim 7, wherein
The gradation variable step,
And a gray level of the current frame image is varied by using a lookup table having set gray level data according to the gray level difference between the current frame image and the previous frame image. Receiving a 3D image;
Calculating an average image level of the 3D image; And
Varying a depth of the 3D image according to the calculated average image level;
Varying the gray level of the current frame image according to the gray level difference between the current frame image and the previous frame image of the depth-variable 3D image; And
And displaying the grayscale current frame image. 10. The method of claim 9,
Converting a frame rate of the decoded 3D image;
The depth variable step,
And operating the frame rate converted 3D image based on the frame rate converted 3D image. An average image level calculator for calculating an average image level of an input 3D image;
A formatter configured to vary the depth of the 3D image according to the calculated average image level; And
And a display for displaying the 3D image having the variable depth. The method of claim 11,
The formatter,
And setting the depth of the 3D image to be smaller when the calculated average image level is less than or equal to a first predetermined value or when the calculated average image level is greater than or equal to a second predetermined value larger than the first predetermined value. Display. The method of claim 11,
The formatter,
And when the calculated average image level is less than or equal to a first predetermined value, the depth of the 3D image decreases as the lower limit value is set. The method of claim 11,
And setting the depth of the 3D image to be smaller as the calculated average image level is greater than or equal to a second predetermined value. The method of claim 11,
And a frame rate converter configured to convert the frame rate of the input 3D image.
The formatter,
And a depth of the frame rate-converted 3D image is varied according to the calculated average image level. The method of claim 11,
And a gradation variable unit configured to vary the gradation of the current frame image according to the gradation difference between the current frame image and the previous frame image of the input image. The method of claim 11,
The display includes a plurality of backlight lamps disposed on a rear surface of the display panel to supply light to the panel,
And the lamp is turned on in synchronization with a left eye image and a right eye image of the depth-variable 3D image.

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