KR101702967B1 - Apparatus for displaying image and method for operating the same - Google Patents

Abstract

The present invention relates to an image display apparatus and an operation method thereof. A method of operating an image display apparatus according to an embodiment of the present invention includes receiving a 3D image, calculating an average image level of the 3D image, and varying the depth of the 3D image according to the calculated average image level . Thereby, the crosstalk can be reduced.

Description

TECHNICAL FIELD [0001] The present invention relates to an image display apparatus and a method of operating the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display apparatus, and more particularly, to an image display apparatus or image display method capable of reducing crosstalk.

A video display device is a device having a function of displaying an image that a user can view. The user can view the broadcast through the video 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 changing from analog broadcasting to digital broadcasting around the world.

Digital broadcasting refers to broadcasting in which digital video and audio signals are transmitted. Compared to analog broadcasting, digital broadcasting is strong against external noise and has a small data loss, is advantageous for error correction, has a high resolution, and provides a clear screen. Also, unlike analog broadcasting, digital broadcasting is capable of bidirectional service.

In addition, various studies on stereoscopic images have been conducted recently, and stereoscopic image technology has become more common and practical in various other environments and technologies as well as computer graphics.

It is an object of the present invention to provide an image display apparatus and an operation method thereof capable of reducing crosstalk.

It is another object of the present invention to provide an image display apparatus and an operation method thereof capable of varying gradation according to a 3D image or a 2D image.

It is another object of the present invention to provide an image display apparatus and a method of operating the same that can change the gradation according to the temperature.

According to another aspect of the present invention, there is provided a method of operating a video display device, the method comprising: receiving a 3D image; calculating an average image level of the 3D image; And varying the depth of the image.

According to another aspect of the present invention, there is provided a method of operating a video display device, the method comprising: receiving a 3D image; computing an average image level of the 3D image; Varying the depth of the 3D image, varying the gradation of the current frame image according to the gradation difference between the current frame image of the depth-varied 3D image and the previous frame image, and displaying the gradation- .

According to another aspect of the present invention, there is provided an image display apparatus including: an average image level calculator for calculating an average image level of an input 3D image; A variable formatter, and a display for displaying a 3D image with a variable depth.

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

Further, by using the 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, the crosstalk can be reduced by increasing the frame rate and aligning the left eye image frame and the right eye image frame alternately in 3D image display.

1 is an internal block diagram of an image display apparatus according to an embodiment of the present invention.
FIG. 2 is a view showing an example of the inside of the power supply unit and the display of FIG. 1. FIG.
3 is a diagram illustrating a gradation level varying unit according to an embodiment of the present invention.
4 is an internal block diagram of the control unit of FIG.
5 is a view showing various formats of a 3D image.
FIG. 6 is a diagram illustrating the operation of the 3D viewing apparatus according to the format of FIG.
Fig. 7 is a view for explaining how images are formed by the left eye image and the right eye image.
8 is a view for explaining the depth of the 3D image according to the interval between the left eye image and the right eye image.
9 is a flowchart illustrating an operation method of an image display apparatus according to an embodiment of the present invention.
FIGS. 10 to 22 are views referred to explain various examples of the operation method of the video display device of FIG.

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

The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

1 is an internal block diagram of an image display apparatus according to an embodiment of the present invention.

1, an image display apparatus 100 according to an exemplary embodiment of the present invention includes a tuner 110, a demodulator 120, an external device interface 130, a network interface 135, A user input interface unit 150, a control unit 170, a display 180, an audio output unit 185, a power supply unit 190, and a 3D viewing device 195.

The tuner 110 selects a channel selected by the user or an RF broadcast signal corresponding to all previously stored channels among RF (Radio Frequency) broadcast signals received through the 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 can process a digital broadcast signal or an analog broadcast signal. The analog baseband video or audio signal (CVBS / SIF) output from the tuner 110 can 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.

In the present invention, 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 outputs the selected RF broadcast signals as an intermediate frequency signal, a baseband image, or a voice signal Can be converted.

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. At this time, the stream signal may be a signal in which a video signal, a voice signal, or a data signal is multiplexed. 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.

Meanwhile, the demodulating unit 120 may be separately provided according to the ATSC scheme and the DVB scheme. That is, it can be provided as an ATSC demodulation unit and a DVB demodulation unit.

The stream signal output from the demodulation unit 120 may be input to the controller 170. The control unit 170 performs demultiplexing, video / audio signal processing, and the like, and then outputs an image to the display 180 and outputs audio to the audio output unit 185.

The external device interface unit 130 can connect the external device and the video 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 can be connected to an external device such as a DVD (Digital Versatile Disk), a Blu ray, a game device, a camera, a camcorder, a computer (notebook) The external device interface unit 130 transmits external video, audio or data signals to the controller 170 of the video display device 100 through the connected external device. Also, the control unit 170 can output the processed video, audio, or data signal to the 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), a DVI (Digital Visual Interface) terminal, an HDMI (High Definition Multimedia Interface) terminal, an RGB terminal, a D-SUB terminal, and the like.

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

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

On the other hand, the external device interface unit 130 can transmit and receive data to and from the 3D viewing device 195.

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

The network interface unit 135 can receive, via the network, contents or data provided by the Internet or a content provider or a network operator. That is, it can receive contents such as movies, advertisements, games, VOD, broadcasting signals, and the like, provided from a contents provider 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 a content provider or network operator.

The network interface unit 135 is connected to, for example, an IP (Internet Protocol) TV and receives the processed video, audio or data signals from the settop box for IPTV to enable bidirectional communication, And can transmit the signals processed by the controller 170 to the IPTV set-top box.

Meanwhile, the IPTV may include ADSL-TV, VDSL-TV, FTTH-TV and the like depending on the type of the transmission network. The IPTV may include a TV over DSL, a video over DSL, a TV over IP 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 unit 140 may store a program for each signal processing and control in the control unit 170 or may store the processed video, audio, or data signals.

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

The storage unit 140 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory) RAM, ROM (EEPROM, etc.), and the like. The image display apparatus 100 can reproduce files (moving picture files, still picture files, music files, document files, etc.) stored in the storage unit 140 and provide them to users.

1 shows an embodiment in which the storage unit 140 is provided separately from the control unit 170, the scope of the present invention is not limited thereto. The storage unit 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 configured to turn on / off the power, select the channel, and display the screen from the remote control device 200 according to various communication methods such as a radio frequency (RF) communication method and an infrared Or transmit a signal from the control unit 170 to the remote control device 200. The remote control device 200 may be connected to the remote control device 200 via a network.

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.

For example, the user input interface unit 150 may transmit a user input signal input from a sensing unit (not shown) that senses the gesture of the user to the control unit 170 or a signal from the control unit 170 (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 control unit 170 demultiplexes the input stream or processes the demultiplexed signals through the tuner 110 or the demodulation unit 120 or the external device interface unit 130 to generate a signal for video or audio output Can be generated and output.

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

The audio signal processed by the control unit 170 may be output to the audio output unit 185 as an audio signal. The audio 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.

In addition, the control unit 170 can control the overall operation in the video display device 100. [ For example, the controller 170 controls the tuner 110 to control the tuner 110 to select an RF broadcast corresponding to a channel selected by the user or a previously stored channel.

In addition, the controller 170 may control the image display apparatus 100 according to 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 control unit 170 may output the video or audio signal processed by the user through the display 180 or the audio output unit 185 together with the channel information selected by the user.

The control unit 170 may be connected to the external device interface unit 130 through an external device such as a camera or a camcorder through the external device interface unit 130 in accordance with the external device video playback command received through the user input interface unit 150. [ So that the video signal or the audio signal of the display unit 180 or the audio output unit 185 can be outputted.

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

At this time, the image displayed on the display 180 may be a still image or a moving image, and may be a 2D image or a 3D image.

On the other hand, the controller 170 generates a 3D object for a predetermined object among the images displayed on the display 180, and displays the 3D object. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), EPG (Electronic Program Guide), various menus, widgets, icons, still images, moving images, 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 be projected relative to the image displayed on the display 180.

On the other hand, the control unit 170 recognizes the position of the user based on the image photographed from the photographing unit (not shown). For example, the distance (z-axis coordinate) between the user and the image display apparatus 100 can be grasped. In addition, the x-axis coordinate and the y-axis coordinate in the video display device 100 corresponding to the user position can be grasped.

Although not shown in the drawing, a channel browsing processing unit for generating a channel signal or a thumbnail image corresponding to an external input signal may be further provided. The channel browsing processing unit receives the stream signal TS output from the demodulation unit 120 or the stream signal output from the external device interface unit 130 and extracts an image from an input stream signal to generate a thumbnail image . The generated thumbnail image may be directly or encoded and input to the controller 170. In addition, the generated thumbnail image may be encoded in a stream format and input to the controller 170. The control unit 170 may display a thumbnail list having a plurality of thumbnail images on the display 180 using the input thumbnail image. At this time, the thumbnail list may be displayed in a simple view mode displayed on a partial area in a state where a predetermined image is displayed on the display 180, or in a full viewing mode displayed in most areas of the display 180.

The display 180 converts a video signal, a data signal, an OSD signal, a control signal processed by the control unit 170, a video signal, a data signal, a control signal, and the like received from the external device interface unit 130, .

The display 180 may be a PDP, an LCD, an OLED, a flexible display, or the like. In particular, according to an embodiment of the present invention, a three-dimensional display (3D display) is preferable.

The display 180 for viewing three-dimensional images can be divided into an additional display method and a single display method.

The single display method can realize a 3D image by the display 180 alone without a separate additional display, for example, glasses or the like. For example, various methods such as a lenticular method, a parallax barrier, Can be applied.

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

In the embodiment of the present invention, a 3D viewing apparatus 195 is provided for viewing 3D images. It is assumed that the 3D viewing device 195 is an additional display of the active type among various types described above. Hereinafter, the shutter glass will be mainly described.

Meanwhile, 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 control unit 170, for example, a stereo signal, a 3.1 channel signal, or a 5.1 channel signal, and outputs it as a voice. The voice output unit 185 may be implemented by various types of speakers.

In order to detect a user's gesture, a sensing unit (not shown) having at least one of a touch sensor, a voice sensor, a position sensor, and an operation sensor may be further provided in the image display apparatus 100 have. A signal sensed by a sensing unit (not shown) is transmitted to the controller 170 through the user input interface unit 150.

The control unit 170 can sense the gesture of the user by combining the images captured from the photographing unit (not shown) or the sensed signals from the sensing unit (not shown), respectively.

The power supply unit 190 supplies power to the entire image display apparatus 100. Particularly, it is possible to supply power to a control unit 170 that can 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. Also, the remote control apparatus 200 can receive the video, audio, or data signal output from the user input interface unit 150 and display it or output it by the remote control apparatus 200.

The video display apparatus 100 described above can be applied to a digital broadcasting of ATSC system (8-VSB system), digital broadcasting of DVB-T system (COFDM system), digital broadcasting of ISDB-T system (BST-OFDM system) And a digital broadcasting receiver capable of receiving at least one of the digital broadcasting signals. In addition, as a portable type, digital terrestrial DMB broadcasting, satellite DMB broadcasting, ATSC-M / H broadcasting, DVB-H broadcasting (COFDM broadcasting), MediaFoward Link Only And a digital broadcasting receiver capable of receiving at least one of digital broadcasting and the like. It may also be a digital broadcast receiver for cable, satellite communications, or IPTV.

Meanwhile, the video display device described in the present specification can be applied to a TV set, a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player) .

Meanwhile, the 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 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 will be described mainly focusing on a liquid crystal display panel (LCD panel) -based display that is capable of three-dimensional display and requires a separate backlight unit.

FIG. 2 is a view showing an example of the inside of the power supply unit and the display of FIG. 1. FIG.

A display 180 based on a liquid crystal display panel (LCD panel) includes a liquid crystal panel 210, a driving circuit unit 230, and a backlight unit 250.

The liquid crystal panel 210 includes a plurality of gate lines GL and data lines DL arranged in a matrix in order to display an image and a thin film transistor and a pixel electrode connected thereto are formed in an intersecting region A second substrate provided 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 control unit 170 shown in Fig. 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 the control signal from the controller 170 and the R, G, and B data signals and the vertical synchronization signal Vsync and outputs a control signal to the gate driver 234 and the data driver 236 ), Rearranges the R, G, and B data signals, and provides the R, G, and B data signals to the data drive 236.

Meanwhile, the timing controller 232 may include a gradation changing unit 300 for changing the gradation of the current frame image according to the gradation difference between the current frame image of the input image and the previous frame image. For example, the gradation of the R, G and B data signals of the current frame image and the gradation of the R, G and B data signals of the previous frame image are used as the gradation of the R, Can be varied. This will be described later with reference to FIG. 3 and the like.

The scanning signal and the video signal are supplied to the liquid crystal panel 210 through the gate line GL and the data line DL under the control of the gate driver 234, the data driver 236 and the timing controller 232 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 as a light source, a scan driver 254 for controlling the scanning drive of the backlight lamp 252, And a ramp driver 256 which is turned off.

When a plurality of backlight lamps (not shown) are turned on, a diffusion plate (not shown) for diffusing light from the lamp, a reflection plate (not shown) for reflecting light, an optical sheet for polarizing, Or the like, light is irradiated onto the entire surface of the liquid crystal panel 210.

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

On the other hand, a plurality of backlight lamps (not shown) can be simultaneously turned on or sequentially driven on a block-by-block basis. Also, a plurality of backlight lamps (not shown) may be a backlight lamp of the LED (light emitting diode) type.

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

The power supply unit 190 supplies the common electrode voltage Vcom to the liquid crystal panel 210 and supplies the gamma voltage to the data driver 236. [ Further, a driving power source for driving the backlight lamp 252 is supplied to the backlight unit 250.

3 is a diagram illustrating a gradation level varying unit according to an embodiment of the present invention.

The gray scale controller 300 according to the 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 level varying unit 300 varies the gradation of the input image. To this end, the gray level varying section 300 includes a lookup table 310, a frame buffer 320, and a gray level setting section 330.

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

The set gradation stored separately in the control unit 170 or the storage unit 140 is transferred from the control unit 170 or the storage unit 140 to the gradation variable unit May be received in look-up table 310 in mobile station 300.

On the other hand, the setting gradation data (LUT) in the lookup table 310 is input to the gradation setting section and can be utilized in gradation setting.

The frame buffer 320 stores the current frame image frame_c received from the controller 170. [ It also stores the previous frame image frame_b. The frame buffer 320 provides the previous frame image frame_b to the gray-level setting unit 330.

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

The gradation setting unit 330 can vary the gradation of the current frame image using the current frame image frame_c, the previous frame image frame_b, and the setting gradation data LUT in the lookup table 310. [

On the other hand, the gray-level setting unit 330 may vary the gray level of the current frame image according to the frame rate of the current frame image frame_c. For example, the larger the frame rate of the current frame image (frame_c), the greater the magnitude of the gradation change amount of the variable gradation.

On the other hand, the gray-level setting unit 330 may vary the gray level of the current frame image according to the temperature in the image display apparatus 100 or the surrounding temperature. For example, the lower the temperature, the greater the magnitude of the gradation variation in the gradation that is varied.

On the other hand, the current frame image frame_v having a variable gradation can 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 gradation can be rearranged and provided to the data drive 236. [

FIG. 4 is an internal block diagram of the control unit 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.

The control unit 170 includes a demultiplexing unit 410, an image processing unit 420, an OSD generating unit 440, a mixer 445, a frame rate converting unit 420, An APL calculation unit 455, and a formatter 460. The APL calculation unit 455 and the formatter 460 may be the same. A voice processing unit (not shown), and a data processing unit (not shown).

The demultiplexer 410 demultiplexes the input stream. For example, when an MPEG-2 TS is input, it can be demultiplexed into video, audio, and data signals, respectively. The stream signal input to the demultiplexer 410 may be a stream signal output from the tuner 110 or the demodulator 120 or the external device interface 130.

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

The video decoder 425 decodes the demultiplexed video signal, and the scaler 435 performs scaling so that the resolution of the decoded video signal can be output from the display 180.

The video decoder 425 can be equipped with a decoder of various standards.

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

For example, if the demultiplexed 2D video signal is a video signal of the H.264 standard according to a DMB (Digital Multimedia Broadcasting) scheme or DVB-H, a depth video of MPEC-C part 3 Viewpoint video according to MVC (Multi-view Video Coding) or free-view video according to a TV (Free-viewpoint TV), it is decoded by an H.264 decoder, MPEC-C decoder, MVC decoder or FTV decoder, .

On the other hand, the image signal decoded by the image processing unit 420 can be divided into a case where there is only a 2D image signal, a case where a 2D image signal and a 3D image signal are mixed, and a case where there is only a 3D image signal.

Meanwhile, the image processor 420 can detect whether the demultiplexed image signal is a 2D image signal or a 3D image signal. Whether or not the 3D video signal is a 3D video signal can 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 image signal is a 3D image signal is determined by referring to a 3D image flag, 3D image meta data, or format information of a 3D image in a header of a stream, It can be judged.

Meanwhile, the image signal decoded by the image processing unit 420 may be a 3D image signal of various formats. For example, a 3D image signal composed of a color image and a depth image, or a 3D image signal composed of 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 includes 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. 5, A top / down format (FIG. 5C) in which the left and right eye image signals and the right eye image signal are arranged in an interlace format (FIG. 5B) 5d), a checker box format (FIG. 5e) in which the left eye image signal and the right eye image signal are mixed box by box, and the like.

The OSD generation unit 440 generates an OSD signal according to a user input or by itself. For example, based on a user input signal, a signal for displaying various information in a graphic or text form on the screen of the display 180 can be generated. The generated OSD signal may include various data such as a user interface screen of the video display device 100, various menu screens, a widget, and an icon. 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 video signal processed by the image processor 420. At this time, the OSD signal and the decoded video signal may include at least one of a 2D signal and a 3D signal. The mixed video signal is supplied to a frame rate converter 450.

A frame rate converter (FRC) 450 converts the frame rate of an input image. For example, a frame rate of 60 Hz is converted to 120 Hz or 240 Hz. When converting the frame rate of 60 Hz to 120 Hz, it is possible to insert the same first frame between the first frame and the second frame, or insert the third frame predicted from 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 insert three predicted frames.

An average picture level calculation unit (APL calculation unit) 455 calculates an average picture level (APL) of an input picture. Particularly, according to the embodiment of the present invention, the average image level of the 3D image is calculated. The higher the APL, the larger the average picture level, and the lower the APL, the lower the average picture level. The image level at this time may be data representing luminance. Also, the APL may be an average picture level per unit frame. Therefore, if the APL is high, it can mean that the average luminance per unit frame is high.

The formatter 460 receives the mixed signal, that is, the OSD signal and the decoded video signal in the mixer 445, and can separate the 2D video signal and the 3D video signal.

In the present specification, the 3D video signal includes a 3D object. Examples of the 3D object include a picuture in picture (PIP) image (still image or moving picture), an EPG indicating broadcasting program information, various menus, widgets, Icons, texts, objects in images, people, backgrounds, web screens (newspapers, magazines, etc.).

On the other hand, the formatter 460 can change the format of the 3D video signal. For example, regardless of the format of the inputted 3D video signal, it can be changed to any one of the various formats illustrated in FIG. Accordingly, according to the format, the operation of the 3D viewing apparatus can be performed as shown in FIG.

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

6 (b) is a view showing that the left eye glass of the shutter glass 195 is opened and the right eye glass is closed when the left eye image L is displayed on the display 180, Is closed, and the right eye glass is opened.

On the other hand, Fig. 6B illustrates the operation of the polarizing glass 195 when the formatter 460 outputs the side-by-side format of the format of Fig. The polarizing glass 195 is passive, and both the left eye glass and the right eye glass remain open.

Meanwhile, the formatter 460 may convert the 2D video signal to a 3D video signal. For example, according to a 3D image generation algorithm, an edge or a selectable object is detected in a 2D image signal, and an object or a selectable object according to the detected edge is separated into a 3D image signal and is generated . At this time, the generated 3D image signal can be separated into the left eye image signal L and the right eye image signal R as described above.

On the other hand, the formatter 460 can vary the depth according to the APL computed by the APL computing unit 455. [ To this end, the parallax (distance) between the left eye image and the right eye image can be adjusted. In particular, when the APL is equal to or less than the first predetermined value (Low_th), the depth is set to be small. Further, when the APL is equal to or greater than the second predetermined value (High_th), the depth is set to be small. This will be described later with reference to FIG.

On the other hand, the audio processing unit (not shown) in the control unit 170 can perform the audio processing of the demultiplexed audio 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 MPEG-2 standard encoded speech signal, it can be decoded by an MPEG-2 decoder. In addition, if the demultiplexed speech signal is a coded voice signal of the MPEG 4 BSAC (Bit Sliced Arithmetic Coding) standard according to a terrestrial DMB (Digital Multimedia Broadcasting) scheme, it can be decoded by an MPEG 4 decoder. Also, if 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 can be decoded by the AAC decoder. If the demultiplexed speech signal is a Dolby AC-3 standard encoded audio signal, it can be decoded by an AC-3 decoder.

In addition, the audio processing unit (not shown) in the control unit 170 can process a base, a treble, a volume control, and the like.

The data processing unit (not shown) in the control unit 170 can perform data processing of the demultiplexed data signal. For example, if the demultiplexed data signal is a coded data signal, it can be decoded. The encoded data signal may be EPG (Electronic Program Guide) information including broadcast information such as a start time and an end time of a broadcast program broadcasted on 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-SI information in the DVB scheme . The ATSC-PSIP information or DVB-SI information may be information included in the above-described stream, i.e., the header (4 bytes) of the MPEG-2 TS.

4 shows that the signals from the OSD generating unit 440 and the image processing unit 420 are mixed in the mixer 445 and then 3D processed in the formatter 460. However, May be located behind the formatter. That is, the output of the image processing unit 420 is 3D-processed by the formatter 460, and the OSD generating unit 440 performs 3D processing together with the OSD generation, and then the 3D signals processed by the mixer 445 are mixed It is also possible to do.

Meanwhile, the block diagram of the controller 170 shown in FIG. 4 is a block diagram for an embodiment of the present invention. Each component of the block diagram can be integrated, added, or omitted according to the specifications of the control unit 170 actually implemented.

In particular, the frame rate converter 450 and the formatter 460 are not provided in the controller 170, but may be separately provided.

FIG. 7 is a view for explaining how images are formed by a left eye image and a right eye image, and FIG. 8 is a view for explaining depths 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, L based on the first left eye image signal and a first right eye image 713, R based on the first right eye image signal, It is exemplified that the interval between the first left eye image 711, L and the first right eye image 713, R is d1 on the display 180. At this time, the user recognizes that an image is formed at an intersection of an extension line connecting the left eye 701 and the first left eye image 711 and an extension line connecting the right eye 703 and the first right eye image 703. Accordingly, the user recognizes that the first object 715 is positioned behind the display 180. [

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

The third object 735 and the fourth object 745 are arranged in the order of the third left eye image 731, L and the second right eye image 733, R, the fourth left eye image 741, Right eye image 743 (R), and their 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 positions where images are formed, respectively, and recognizes that they are located before the display 180 in the drawing.

At this time, it is recognized that the fourth object 745 is ahead of or more protruded than the third object 735. This means that the interval between the fourth left eye image 741, L and the fourth right eye image 743, R d4 is larger than the interval d3 between the third left eye image 731, L and the third right eye image 733, R.

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

8, the interval a between the left eye image 801 and the right eye image 802 in FIG. 8 (a) is smaller than the interval (a) between the left eye image 801 and the right eye image 802 shown in FIG. 8 (b) (b ') is smaller than the depth (a') of the 3D object in FIG. 8 (a) and the depth (b ') in the 3D object in FIG. 8 (b).

In this way, when the 3D image is exemplified as the left eye image and the right eye image, the positions recognized as images are different depending on the interval between the left eye image and the right eye image. Accordingly, by adjusting the display intervals of the left eye image and the right eye image, the depth of the 3D image or the 3D object composed of the left eye image and the right eye image can be adjusted.

FIG. 9 is a flowchart illustrating an operation method of an image display apparatus according to an embodiment of the present invention, and FIGS. 10 to 22 are referred to for explaining various examples of an operation method of the image display apparatus of FIG.

Referring to FIG. 9, first, a 3D image is received (S910). The image input to the image display apparatus 100 may be a broadcast image from a broadcast signal received from the tuner 110, an external input image from an external apparatus, an image stored in the storage unit 140, And may be an image input from a content provider.

On the other hand, when the information including the 3D image or the flag is included in the stream including the image, the control unit 170 obtains the information or flag at the time of demultiplexing or decoding, It is possible to judge whether or not it is a 3D image.

Meanwhile, when the input image is a multiple 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, the average image level of the 3D image is calculated (S915). The control unit 170 calculates the average image level (APL) of the input 3D image. Specifically, the APL arithmetic unit 455 in the control unit 170 calculates the average image level of the 3D image have.

The higher the APL, the larger the average picture level, and the lower the APL, the lower the average picture level. The image level at this time may be data representing luminance. Also, the APL may be an average picture level per unit frame. Therefore, if the APL is high, it can mean that the average luminance per unit frame is high.

On the other hand, 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). Then, the depth of the 3D image is varied according to the calculated average image level (S925). Then, the depth-varying 3D image is alternately aligned with the left eye image and the right eye image (S930). Then, the gradation of the current frame image is varied according to the gradation difference between the current frame image of the input 3D image and the previous frame image (S935). Then, the variable-gradation current frame image is displayed (S940).

10 (a) illustrates image frames of a 3D image imaged by the image processing unit 420. FIG. At this time, it can be seen that the format of the 3D image frame 1010 is a top / down format (see FIG. 5 (b)).

Next, with respect to operation 920 (S920), the frame rate conversion unit 450 converts the frame rate of the 3D image. For example, a frame rate of 60 Hz is converted to 120 Hz or 240 Hz.

10 (b) illustrates an example in which the frame rate converter 450 increases the frame rate of the 3D image. The frame rate conversion unit 450 may increase the frame rate by repeatedly inserting the 3D image frame 1020. [ At this time, the 3D image format is maintained in the top down format.

10 (b) illustrates that the frame rate is increased four times, but not limited thereto, and may be increased by various settings such as twice. On the other hand, the frame rate conversion can be selectively performed.

Next, with respect to step 925 (S925), the formatter 460 varies the depth of the 3D image according to the APL computed by the APL computing unit 420. [

Figure 11 illustrates a graph of the calculated APL and set depth.

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

In particular, the formatter 460 can be set so that the depth of the 3D image becomes smaller as the APL is lowered to a lower limit (for example, 0) when the computed APL is equal to or less than the first predetermined value (Low_th).

In addition, the formatter 460 can be set so that the depth of the 3D image becomes smaller as the upper limit is reached, when the calculated APL is equal to or greater than the second predetermined value HIgh_th.

The depth variable of the 3D image according to the calculated APL is related to the over driving of the liquid crystal panel, which will be described later with reference to FIG. 18 and the like.

In order to improve the response speed of the liquid crystal panel, in a state in which overdriving drive for applying an additional voltage or additional tones is performed as shown in Fig. 18 (b), a high gray level Overdriving can not be performed in the case of a low gray level (e.g., 0 gray level) or a low gray level (e.g., 0 gray level). This phenomenon can occur in both 2D image display and 3D image display.

Particularly, when a 3D image is displayed, a crosstalk phenomenon, which is a folding phenomenon of a left eye image and a right eye image, is likely to occur due to a slow response speed of the liquid crystal panel, and thus the stereoscopic effect is halved.

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

11, when the APL is not less than the first predetermined value (Low_th) or is not less than the second predetermined value (HIgh_th) because the overdriving is difficult to perform adequately and the crosstalk characteristic is poor, it is preferable to vary the depth. Particularly, it is preferable to reduce the depth of the set 3D image and perform signal processing so as to be smaller. As a result, the crosstalk characteristics are improved in 3D image display.

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

Next, with respect to step 930 (S930), the formatter 460 alternately aligns the 3D image with the left eye image and the right eye image. In other words, it is converted into the frame sequential format exemplified in Fig. 5 (c).

10C and 10D illustrate that the formatter 460 converts the format of the 3D image frame converted from the frame rate by the frame rate converter 450 into the 3D image frame of the frame sequential format do.

10 (c) shows a first left eye image frame L1, a first left eye image frame L1, a first right eye image frame R1, a first right eye image frame R1, The second left eye image frame L2, and the like. That is, the same left eye image frames are successively arranged, and thereafter the same right eye image frames are successively arranged.

10D shows a first left eye image frame (L1) 1030, a black frame 1040, a first right eye image frame R1, a black frame, a second left eye image frame L2 ), 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 arranged alternately in the formatter 460, the respective frames are inputted to the display 180.

Next, Figs. 12 to 17 illustrate various examples of varying the 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 a first predetermined value (Low_th), as shown in FIG.

First, the left eye image 1210 and the right eye image 1225 include 3D objects 1215 and 1225, respectively. 13A, when the 3D viewing device is worn, corresponding to the parallax L1 between the 3D object 1215 in the left eye image 1210 and the 3D object 1225 in the right eye image 1220, And a 3D object 1315 having a predetermined depth d1 are displayed on the screen 1310. [

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

Therefore, when the 3D viewing apparatus is worn, the 3D object 1325 of the image 1310 and the reduced depth d2 is displayed on the display 180 as shown in FIG. 13 (b).

On the other hand, when the APL value of the left eye image 1210 and the right eye image 1220 is less than or equal to the first predetermined value Low_th and the formatter 460 moves from the left eye image 1210 to the lower limit value (for example, The parallax between the 3D object 1235 in the right eye image 1220 and the 3D object 1245 in the right eye image 1220 can be gradually reduced. As a result, the depth of the displayed 3D object becomes smaller.

14 shows an example in which the APL value of the left eye image 1410 and the right eye image 1420 is smaller than the first predetermined value Low_th and smaller than the second predetermined value High_th as shown in FIG. do.

First, the left eye image 1410 and the right eye image 1425 include 3D objects 1415 and 1425, respectively. Corresponding to the parallax L3 between the 3D object 1415 in the left eye image 1410 and the 3D object 1425 in the right eye image 1420, The 3D object 1515 of the image 1510 and the 3D object 1515 of the predetermined depth d3 are displayed.

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

Accordingly, when the 3D viewing apparatus is worn, the 3D object 1525 of the image 1510 and the reduced depth d4 is displayed on the display 180 as shown in FIG. 15 (b).

On the other hand, it can be seen that the depth d4 is larger than the 3D object 1525 of Fig. 13 (b).

11, when the APL value of the left eye image 1410 and the right eye image 1420 is 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 that the set depth is displayed as it is without a separate depth changing step. That is, as shown in FIG. 15 (a), the display 180 may display the image 1510 and the 3D object 1515 having the predetermined depth d3 as it is.

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

First, the left eye image 1610 and the right eye image 1625 include 3D objects 1615 and 1625, respectively. Corresponding to the parallax L5 between the 3D object 1615 in the left eye image 1610 and the 3D object 1625 in the right eye image 1620, And a 3D object 1715 having a predetermined depth d5 are displayed on the screen 1710. [

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

Accordingly, when the 3D viewing apparatus is worn, the 3D object 1725 of the image 1710 and the reduced depth d6 is displayed on the display 180 as shown in FIG. 17 (b).

On the other hand, when the APL value of the left eye image 1610 and the right eye image 1620 is equal to or greater than the second predetermined value (High_th) and the formatter 460 moves from the 3D object 1635 in the left eye image 1610 , The parallax of the 3D object 1645 in the right eye image 1620 can be gradually reduced. As a result, the depth of the displayed 3D object becomes smaller.

On the other hand, Fig. 18 is a diagram referred to for explaining overdriving used in driving the liquid crystal panel.

As described above, since the liquid crystal panel 210 has the characteristics of response speed and hold type of the liquid crystal, the display time of the upper and lower portions of the liquid crystal panel 210 is delayed and a crosstalk phenomenon occurs .

Fig. 18 (a) illustrates normal driving of the liquid crystal panel, and Fig. 18 (b) 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 the first voltage V1 is applied during a predetermined frame and the second voltage V2 higher than the first voltage V1 is momentarily applied, the second voltage V2 is changed according to the slow response speed of the liquid crystal, And has the same transition period as 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) is larger. As a result, a motion blurring phenomenon in which a picture is blurred in the moving picture occurs. In addition, when a 3D image is implemented, a crosstalk phenomenon occurs, which is an image overlapping phenomenon between a left eye image and a right eye image.

In order to prevent this, the embodiment of the present invention applies overdriving as shown in Fig. 18 (b).

18 (b) shows the liquid crystal response speed L according to the voltage V applied to the liquid crystal panel. That is, a third voltage V3 higher than the second voltage V2 is applied before the second voltage V2, which is higher than the first voltage V1, is applied momentarily while the first voltage V1 is applied for a predetermined frame, So that the slow response speed of the liquid crystal is improved.

In the figure, it can be seen that the transition period is the second period T2 which is considerably reduced compared to the first period T1 of FIG. 18 (a). In order to shorten the transition period, it is desirable to further raise the level of the third voltage V3. That is, the larger the difference (Vd2) between the second voltage (V2) and the third voltage (V3) is, the shorter the transition period becomes.

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

The control unit 170 or the storage unit 140 stores the gray level variable in the timing controller 232 in step S930 after the left eye image and the right eye image of the 3D image are alternately aligned (OD data) corresponding to the 3D image can be transmitted to the display unit 300. [ 3, the look-up table 310 stores predetermined gradation data (OD data) based on the gradation of the current frame image and the gradation of the previous frame image.

The gray level setting unit 330 in the gray level varying unit 300 sets the gray level of the current frame image frame_c in accordance with the difference in gray level between the current frame image frame_c of the input image and the previous frame image frame_b stored in the frame buffer 320 The gradation 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 gray level to be set may be 139, which is larger than 128 gray levels. As described above, by increasing the gradation change amount and performing overdriving, it is possible to prevent a crosstalk phenomenon that may occur during 3D image display.

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.

On the other hand, 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 without regard to the gray level of the previous frame image. When the gray level of the current frame image is 0, 0 ", regardless of the grayscale of the pixel.

20 shows an example of the gradation Ga of the input image at the time of over driving. That is, when the first gradation G1 is applied during a predetermined frame and the second gradation G2 higher than the first gradation G1 is set, the third gradation G2, which is higher than the second gradation G2, (G3) can be set. That is, the gradation change amount Gd2 between the second gradation G2 and the third gradation G3 is set to be larger.

On the other hand, the larger the gradation difference GD1 between the first gradation G1 and the second gradation G2, the larger the third gradation G3 in Fig. 20A can be set. Whereby overdriving can be performed more efficiently. As described above, by increasing the gradation change amount and over driving, it is possible to prevent the crosstalk phenomenon in 3D image display.

Fig. 21 shows another example of the gradation Gb of the input image at the time of overdriving. That is, when the fifth gradation G5 is applied during a predetermined frame, and the sixth gradation G6 lower than the fifth gradation G5 is set, for overdriving, the seventh gradation G6, which is lower than the sixth gradation G6, The gradation G7 can be set. That is, the gradation change amount Gd5 between the sixth gradation G6 and the seventh gradation G7 is set to be large.

On the other hand, the larger the gradation difference GD4 between the fifth gradation G5 and the sixth gradation G6, the smaller the seventh gradation G7 in Fig. 21A can be set. Whereby overdriving can be performed more efficiently.

On the other hand, the gray-level setting unit 330 may vary the gray level of the current frame image according to the frame rate of the current frame image frame_c. For example, the larger the frame rate of the current frame image (frame_c), the greater the magnitude of the gradation change amount of the variable gradation.

On the other hand, in step 940 (S940), the current frame image of the variable gradation is displayed. For example, in the case of a 3D image having a variable depth according to the ASL, the left eye image is displayed first and the right eye image is displayed thereafter in accordance with the frame sequential format. For this, the backlight lamp 252 is turned on in synchronization with the sequentially arranged left eye image and right eye image, respectively. When the above-described gradation change is performed, the gradation-varied left eye image is displayed first, and the right eye image is displayed thereafter.

22, in a state in which the left eye image frame and the right eye image frame are aligned in the formatter 460, as shown in FIG. 10C, a backlight lamp 252 ).

22 (a) shows a vertical synchronizing frequency (Vsync) for indicating the display time of each frame, FIG. 22 (b) shows a case where the backlight lamp 252 is in a state in which each frame is inputted to the liquid crystal panel 210 The left eye image frame and the right eye image frame are turned on in synchronization with each other.

22 (b) is a view showing a state in which the backlight lamp 252 and the liquid crystal panel (not shown) disposed above the liquid crystal panel 210 during a partial period of a continuously arranged left eye image frame or a part of a continuous right eye image frame The backlight lamp 252 disposed on the lower side of the display panel 210 is turned on. By this driving, the crosstalk phenomenon in which the adjacent images (the left eye image and the right eye image) overlap each other when the 3D image is displayed is reduced. In addition, the crosstalk phenomenon is reduced by the depth variable or gradation variable driving according to the ASL described above.

22 (b) illustrates that the backlight lamp 252 disposed on the upper side of the panel is first turned on and the backlight lamp 252 disposed on the lower side of the panel is turned on later.

When the backlight lamp 252 disposed on the upper side of the panel is turned on, light is transmitted from the upper side to the center side of the panel, and the backlight lamp 252 disposed on the lower side of the panel is turned on The light is transmitted from the lower side to the central portion of the panel and is displayed.

On the other hand, FIG. 22 (c) shows the turn-on / turn-off timing of the backlight lamp 252. FIG. In the drawing, it is assumed that the backlight lamp 252 is turned on at a high level.

On the other hand, FIG. 22 (d) shows the timing of the operation signal 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 according to the operation signal timing of the shutter glass 195 do.

On the other hand, in the 3D image display, by displaying the backlight in each of the left eye image frame and the right eye image frame, the 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 can 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 apparatuses in which data that can be read by the processor is stored. Examples of the recording medium that can be read by the processor include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an 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 . In addition, the processor-readable recording medium may be distributed over network-connected computer systems so that code readable by the processor in a distributed fashion can be stored and executed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

Claims (17)

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 picture level;
Varying a gradation of a current frame image according to a gradation difference between a current frame image of the depth-variable 3D image and a previous frame image; / RTI >
Wherein the step of varying the depth comprises:
Setting the depth of the 3D image to be smaller when the calculated average image level is equal to or less than a first predetermined value or the calculated average image level is equal to or greater than a second predetermined value larger than the first predetermined value,
Wherein the gradation-
Wherein the control is performed so that the gradation change amount of the variable gradation becomes larger as the temperature of the video display device becomes lower. delete The method according to claim 1,
Wherein the step of varying the depth comprises:
Wherein when the calculated average picture level is equal to or less than a first predetermined value, the depth of the 3D image is set to become smaller toward a lower limit value. The method according to claim 1,
Wherein the step of varying the depth comprises:
And when the calculated average picture level is equal to or greater than the second predetermined value, the depth of the 3D image is set to become smaller toward the upper limit value. The method of claim 1, wherein
And displaying the 3D image with the variable depth. The method according to claim 1,
And converting the frame rate of the received 3D image,
Wherein the step of varying the depth comprises:
Wherein the frame rate conversion is performed based on the frame rate converted 3D image. delete The method according to claim 1,
Wherein the gradation-
Wherein the grayscale of the current frame image is varied by using a lookup table having set grayscale data according to a grayscale 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 picture level;
Varying a gradation of a current frame image according to a gradation difference between a current frame image of the depth-variable 3D image and a previous frame image; And
And displaying the gradation-changed current frame image,
Wherein the step of varying the depth comprises:
Setting the depth of the 3D image to be smaller when the calculated average image level is equal to or less than a first predetermined value or the calculated average image level is equal to or greater than a second predetermined value larger than the first predetermined value,
Wherein the gradation-
Wherein the control is performed so that the gradation change amount of the variable gradation becomes larger as the temperature of the video display device becomes lower. 10. The method of claim 9,
And converting the frame rate of the decoded 3D image,
Wherein the step of varying the depth comprises:
Wherein the frame rate conversion is performed based on the frame rate converted 3D image. An average image level calculating unit for calculating an average image level of the input 3D image;
A formatter for varying the depth of the 3D image according to the calculated average picture level;
A gray level varying unit for changing a gray level of the current frame image according to a gray level difference between a current frame image of the input image and a previous frame image; And
And a display for displaying the depth-varied and gradated 3D image,
Setting the depth of the 3D image to be smaller when the calculated average image level is equal to or less than a first predetermined value or the calculated average image level is equal to or greater than a second predetermined value larger than the first predetermined value,
Wherein the gradation-
And controls so that the gradation change amount of the variable gradation becomes larger as the temperature of the image display apparatus becomes lower. 12. The method of claim 11,
The formatter comprising:
And sets the depth of the 3D image to be smaller when the calculated average image level is equal to or smaller than a first predetermined value or the calculated average image level is equal to or larger than a second predetermined value larger than the first predetermined value Display device. 12. The method of claim 11,
The formatter comprising:
And sets the depth of the 3D image to be smaller as the calculated average image level is lower than the first predetermined value. 12. The method of claim 11,
And sets the depth of the 3D image to be smaller as the calculated average picture level becomes the upper limit value when the calculated average picture level is equal to or greater than the second predetermined value. 12. The method of claim 11,
And a frame rate conversion unit for converting a frame rate of the input 3D image,
The formatter comprising:
And the depth of the 3D-converted image is varied according to the calculated average image level. delete 12. The method of claim 11,
The display includes a plurality of backlight lamps disposed on a back surface of a display panel to supply light to the panel,
Wherein the lamp is turned on in synchronization with the left eye image and the right eye image of the depth-varying 3D image.

Images