KR20130076668A - Back light providing apparatus, display apparatus and controlling method thereof - Google Patents

Abstract

A display device is disclosed. The display apparatus combines a plurality of receivers each receiving a plurality of contents, a plurality of signal processors configured to process the contents received by the plurality of receivers to form an image frame, and a video frame of each of the contents configured in the plurality of signal processors. And a display unit for displaying. Accordingly, a display device that provides a plurality of contents to a plurality of users can perform optimized image processing for each of the contents without being influenced by other contents, and the user can watch the optimal image.

Description

Backlight providing device, display device and control method thereof {BACK LIGHT PROVIDING APPARATUS, DISPLAY APPARATUS AND CONTROLLING METHOD THEREOF}

The present invention relates to a backlight providing apparatus, a display apparatus and a control method thereof, and more particularly, to a backlight providing apparatus, a display apparatus and a control method for providing a backlight for a plurality of contents.

Various types of electronic products are being developed and distributed by the development of electronic technology. In particular, various display devices such as TVs, mobile phones, PCs, notebook PCs, and PDAs are used in most households.

As the use of display devices has increased, the user needs for more diverse functions have also increased. As a result, the efforts of manufacturers to meet user needs have increased, and products including new features such as the provision of 3D contents are emerging one after another.

In addition, in recent years, a development effort has been made for a display device in which a plurality of contents are simultaneously provided and a plurality of users can view different contents. However, when one signal processor is used for a plurality of contents as in a conventional display apparatus, a problem may occur in image processing.

1 is a block diagram illustrating a configuration of a display apparatus including one conventional signal processor.

Referring to FIG. 1, a conventional display apparatus 10 includes a receiver 1, a signal processor 2, and a display 3. The receiver 1 receives the content, and the signal processor 2 composes an image frame of the received content and displays it on the display 3.

However, when a plurality of contents are to be provided at the same time, the display unit 3 alternately arranges and displays the image frames of the plurality of contents. In particular, in the process of processing such image frames in the signal processing unit 2 In particular, in the process of converting the frame rate of the content, it is influenced by other content arranged adjacently, and thus, the optimized image processing cannot be performed.

In detail, the process of converting the frame rate is performed by generating a new image frame between successive image frames. The new image frame calculates an intermediate value by interpolating respective corresponding pixel values in the before and after image frames. Generated in such a way. In this process, if there is an image frame of different contents in the front and rear image frames, there may be a problem that an optimum image frame cannot be generated under the influence of the image frame of the other contents.

In addition, when providing a plurality of contents at the same time using such a display device, when providing a backlight by analyzing a plurality of image frames at the same time as in the conventional display device, filtering for gradually changing the brightness between each image frame In the filtering process, there is a problem in that an optimal brightness required for each image frame cannot be provided under the influence of image frames of other adjacent contents.

For example, when processing image frames of the plurality of contents A and B including the day image and the night image through one image analyzer, the image frames of the content A including the day image may be adjacent to the adjacent night image during the filtering process. It may be displayed darker than the required brightness under the influence of the image frame of the containing content B. In addition, the image frame of the content B may be displayed brighter than the required brightness under the influence of the image frame of the adjacent content A.

SUMMARY OF THE INVENTION The present invention is directed to the above-described necessity, and an object of the present invention is to provide a display apparatus for providing a plurality of contents to a plurality of users, the display apparatus being capable of performing optimal image processing without being influenced by other contents. It is to provide a control method.

Another object of the present invention is to provide a backlight providing apparatus and a control method thereof for providing a backlight having an optimal brightness for each of a plurality of contents. In addition, the present invention provides a display device including the backlight providing apparatus.

According to an aspect of the present invention, a backlight providing apparatus includes a plurality of image analyzers for detecting brightness characteristic information of an image frame for each content view, a light source unit for providing a backlight to a display panel, a backlight driver for driving the light source unit, And a controller configured to control the backlight driver to provide a backlight corresponding to the detected luminance characteristic information for each of the plurality of content views.

The controller may be configured to determine a duty ratio for each of the plurality of content views using the luminance characteristic information of each image frame, and apply the driving signal based on the determined duty ratio to the light source unit. Can be controlled.

The plurality of image analyzers may detect, as the luminance characteristic information, an average luminance value of each pixel constituting an image frame of the content.

In addition, in the method of controlling a backlight providing apparatus according to an embodiment of the present disclosure, when a plurality of contents combined in units of image frames is input, image frames of respective contents are divided by content views and image frames included in each content view. Detecting luminance characteristic information of the apparatus, and providing a backlight corresponding to the detected luminance characteristic information for each content view.

The providing of the backlight may include determining a duty ratio for each of the plurality of content views by using brightness characteristic information of each image frame, and generating a driving signal having the determined duty ratio. And applying the driving signal to a backlight unit to provide the backlight.

The luminance characteristic information may be an average luminance value of pixels constituting each image frame.

According to an embodiment of the present invention, a display apparatus includes a plurality of receivers each receiving a plurality of contents, a plurality of signal processing units configured to process the received plurality of contents, respectively, to form an image frame, and a plurality of signal processing units. A mux unit for multiplexing image frames of contents, a panel unit for displaying the multiplexed image frames, a data separator for separating the image frames of the plurality of contents provided to the panel unit for each content view, separated for each content view A plurality of image analyzers for detecting luminance characteristic information of each image frame, a backlight unit for providing a backlight to the panel unit, and a plurality of content views displayed on the panel unit, Providing backlight corresponding to luminance characteristic information And a control unit for controlling the backlight unit.

Herein, the controller may determine a duty ratio for each of the plurality of content views using the luminance characteristic information of each image frame, and control the backlight unit to apply a driving signal according to the determined duty ratio. .

The plurality of image analyzers may detect, as the luminance characteristic information, an average luminance value of each pixel constituting an image frame of the content.

Here, each of the plurality of signal processing units includes a decoder for decoding the image data included in the received content, a scaler for scaling the decoded image data, and a frame rate conversion for converting the frame rate of the image data. It may include wealth.

On the other hand, the control method of the display device according to an embodiment of the present invention, the step of receiving a plurality of contents, respectively, processing the contents received by the plurality of receivers to form an image frame and the plurality of signal processing unit And combining and outputting image frames of the configured contents.

The configuring of the image frame may include decoding the image data included in the received content, performing scaling on the decoded image data, and converting a frame rate of the image data. It may include.

According to various embodiments of the present disclosure as described above, in a display device that provides a plurality of contents to a plurality of users, the user may perform optimized image processing for each of the contents without being influenced by other contents. You can watch the best video.

In addition, it is possible to provide an optimal backlight corresponding to each content view without being affected by the image frame of other contents.

1 is a block diagram illustrating a configuration of a display apparatus including one conventional signal processor.
2A is a diagram for describing a method of providing a plurality of 2D contents according to an exemplary embodiment.
2B is a diagram for describing a method of providing a plurality of 3D contents according to an exemplary embodiment.
3 is a block diagram illustrating a display apparatus according to an exemplary embodiment.
4 is a block diagram illustrating a specific configuration of a signal processor according to an exemplary embodiment.
5 is a block diagram illustrating a configuration of a backlight providing apparatus according to an exemplary embodiment.
6 is a diagram illustrating an operation of a plurality of image analyzers according to an exemplary embodiment.
7 is a view for explaining the operation of the backlight driver and the control unit according to an embodiment of the present invention.
8 is a block diagram illustrating a configuration of a display apparatus according to another exemplary embodiment.
9 is a flowchart illustrating a control method of a display apparatus according to an exemplary embodiment.
10 is a flowchart illustrating a backlight providing method according to an embodiment of the present invention.

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

2A and 2B are schematic diagrams illustrating a configuration of a content providing system according to an exemplary embodiment. As shown in FIGS. 2A and 2B, the present content providing system includes a display apparatus 100 and an eyeglass apparatus 200.

2A is a diagram for describing a method of providing a plurality of 2D contents according to an exemplary embodiment.

The display apparatus 100 alternately displays a plurality of 2D contents (contents A and B) in the plurality of content views (content views 1 and 2), and the glasses apparatuses 1 and 2 200-1 corresponding to each content view. And generates a synchronization signal for synchronizing the 200-2, and transmits it to the eyeglasses 200-1 and 200-2.

In this case, the spectacle device 1 200-1 opens both the left shutter glass and the right shutter glass when one content A is displayed according to the synchronization signal, and the left shutter when the other content B is displayed. It may be operable to turn off both the glass and the right shutter glass. Accordingly, the viewer 1 wearing the spectacles 1 200-1 is placed in the content view A synchronized with the spectacles 1 200-1 among the plurality of contents A and B that are alternately displayed. Only one piece of content A is displayed. In the same manner, viewer 2 wearing the spectacles 2 200-2 may watch the content B only.

2B is a diagram for describing a method of providing a plurality of 3D contents according to an exemplary embodiment.

As shown in the drawing, when the plurality of 3D contents (contents A and B) are 3D contents, the display apparatus 100 alternately displays the plurality of 3D contents (contents A and B), while the left eye image of each 3D content and The right eye image can also be displayed alternately.

For example, the left eye image and the right eye images AL and AR of the 3D content A may be displayed, and the left eye image and the right eye images BL and BR of the 3D content B may be alternately displayed. In this case, the eyeglass apparatus 1 200-1 synchronized with the content view 1 opens the left and right eye glasses at the display time point of the left eye image and the right eye image AL and AR of the 3D content A, and is synchronized with the content view 2. The spectacle apparatus 2 200-2 may open the left and right eye glasses at the display time point of the left eye image and the right eye images BL and BR of the 3D content B. FIG.

Accordingly, viewer 1 wearing the spectacle device 1 200-1 views only the 3D content A, and viewer 2 wearing the spectacle device 2 200-2 only views the 3D content B. You will watch.

Here, the content view means a set of image frames for one content that can be viewed by a viewer wearing a spectacles when the image frames of each content are alternately arranged and displayed. However, the content view is a different concept from each content. For example, when the viewer 1 watches the content C by wearing the glasses device 200-1 synchronized with the content view 1 and changing the TV channel or playing another DVD content or the like while watching the content A, The content changes from A to C, but content view 1 does not change. That is, the concept of a kind of channel that can watch the content as the concept of the content.

On the other hand, the display device 100 and the glasses 200 are Wi-Fi (Bluetooth), Bluetooth (Bluetooth), IRDA (Infrared Data Association), RF (Radio Frequency), IEEE 802.11, WLAN, HR WPAN, UWB, LR WPAN, etc. It can communicate with the same various wireless communication technology.

3 is a block diagram illustrating a display apparatus according to an exemplary embodiment.

Referring to FIG. 3, the display apparatus 100 includes a plurality of receivers 110-1, 110-2,..., 110-n, and a plurality of signal processors 120-1, 120-2,. n), the display 190 and the controller 140. The display device 100 may be implemented as various devices including a display unit such as a TV, a mobile phone, a PDA, a notebook PC, a monitor, a tablet PC, an e-book, an electronic picture frame, a kiosk, and the like.

The plurality of receivers 110-1, 110-2,..., 110-n respectively receive a plurality of different contents. In detail, each receiver 110-1, 110-2,..., 110-n stores contents from a broadcasting station transmitting broadcast program content using a broadcast network or a web server transmitting content files using the Internet. Receive. It is also possible to receive content from various recording medium playback apparatuses provided in the display apparatus 100 or connected to the display apparatus 100. [ The recording medium playback device refers to a device that plays back content stored in various types of recording media such as CD, DVD, hard disk, Blu-ray disk, memory card, USB memory,

In an embodiment of receiving content from a broadcasting station, the plurality of receivers 110-1, 110-2,..., 110-n may include a tuner (not shown), a demodulator (not shown), and an equalizer (not shown). It may be implemented in a form including a configuration such as. In contrast, in an embodiment of receiving content from a source such as a web server, the plurality of receivers 110-1, 110-2,..., 110-n may be implemented as a network interface card (not shown). . Alternatively, in the case of receiving the contents from the various recording medium reproducing apparatuses described above, the plurality of receiving units 110-1, 110-2,..., 110-n may include an interface unit (not shown) connected to the recording medium reproducing apparatus. May be implemented. As such, the plurality of receivers 110-1, 110-2,..., 110-n may be implemented in various forms according to embodiments.

Also, the plurality of receivers 110-1, 110-2,..., 110-n do not necessarily receive content from a source of the same type, and the plurality of receivers 110-1, 110-2,. 110-n) may receive content from different types of sources. For example, the receiver 1 110-1 may be implemented in a form including a tuner, a demodulator, an equalizer, and the like. The receiver 2 110-2 may be implemented as a network interface card.

The signal processing units 120-1, 120-2,..., 120-n process the contents received from the plurality of receivers 110-1, 110-2,..., 110-n, respectively. An image frame can be configured. The signal processor 120 will be described in more detail with reference to FIG. 4.

4 is a block diagram illustrating a specific configuration of a signal processor according to an exemplary embodiment.

As shown in FIG. 4, the signal processor 1 120-1 includes a decoder 1 121-1, a scaler 122-1, and a frame rate converter 1 123-1. Although only one signal processor 1 120-1 is illustrated in FIG. 2, all of the other signal processors 120-2,..., 120-n may have the same structure as that of FIG. 3.

The decoder 1 121-1 decodes image data included in the content received from the receiver 1 110-1. The scaler unit 1 122-1 performs scaling on the decoded image data. In detail, the scaler 1 122-1 may perform up or down scaling in accordance with the screen size of the display 190.

The frame rate converter 1 123-1 converts the frame rate of the content provided from the scaler 1 122-1 to match the output rate of the display apparatus 100. For example, if the display apparatus 100 operates at 60 Hz in the single view mode, the frame rate converter 1 123-1 converts the frame rate of each content to 60 Hz, the same as the frame rate in the single view mode. I can convert it. In the multi-view mode, the display apparatus 100 operates at an output rate of n * 60Hz when there are n contents.

The method of converting the frame rate is the same as the method used in a general display device, which will be briefly described as a technique known to those skilled in the art.

For example, movie films generally have a frame rate of 24 Hz. In order to output such a motion picture film to a display device having an output rate of 60 Hz, 2-3 pull downs are performed. 2-3 pull down refers to converting two image frames of a motion picture film into two and three image frames, that is, five image frames, respectively.

Meanwhile, the new image frame may be generated by interpolating the existing image frame. As described above, when this process is performed by one signal processor, a new image frame cannot be generated with an appropriate value by performing interpolation between different contents, but when each signal processor processes each received content The frame rate can be converted by generating an appropriate image frame without being affected by other contents.

In addition, the signal processor 1 120-1 may convert the image data into an image format corresponding to the frame rate converter 1 123-1. In detail, while the input image data is in a top-to-bottom format, the frame rate converter 1122-1 performs a frame in side-by-side format. In the case of processing, the signal processor 1 121-1 may convert the image frames of the respective contents into side-by-side format by connecting the image frames of each content in parallel in the horizontal direction.

The display 190 displays a combination of image frames of respective contents configured in the signal processing units 120-1, 120-2,..., 120-n. Specifically, the display 190 multiplexes the image frames of the contents provided from the signal processing units 120-1, 120-2,. do. In some cases, the display 190 may perform up or down scaling of an image frame for each content in accordance with the screen size.

For example, in the case of a shutter glass display device, the display 190 may alternately arrange at least one image frame of the first content, the image frame of the second content, ..., and the image frame of the n-th content. Configure to display. The user wears the spectacles 200 linked to the timing at which the contents are displayed on the display 190, and watches the contents desired by the user. Specifically, the spectacle device 200 is provided with a left eye shutter glass and a right eye shutter glass. The left eye shutter glass and the right eye shutter glass are alternately turned on / off when watching 3D content, but as described above, when viewing a frame in which at least one image frame is alternately arranged, output of the content synchronized with the spectacle apparatus. It is turned on and off collectively according to the timing. Accordingly, the user can watch the content separately from other users.

As described above, a mode of alternately arranging image frames of each content and displaying the same may be referred to as a multi view mode (or a dual view mode). When the display apparatus 100 operates in a normal mode (or a single view mode) displaying only one 2D content or 3D content, only one of the plurality of receivers 110-1, 110-2,..., 110-n is displayed. Can be activated to process content. When the user selects the multi-view mode while operating in the normal mode, the display apparatus 100 may activate the remaining receiver to process data in the above-described manner.

Meanwhile, the above-described content may be 2D content or 3D content. 3D content refers to content that allows a user to feel three-dimensional by using a plurality of images representing the same object from different perspectives.

When using a plurality of 3D contents, the display 190 may include a left eye image and a right eye included in each 3D content provided by the plurality of frame rate converters 122-1, 122-2, ..., 122-n. Images may be multiplexed in a predetermined arrangement and alternately arranged with image frames of other contents.

Accordingly, the left eye image, the right eye image of the first content, the left eye image of the second content, the right eye image, the left eye image of the n-th content, and the right eye image are sequentially arranged and displayed, and the user displays the eyeglasses 200. Through this, the left eye image and the right eye image of one content are recognized.

Meanwhile, although not shown in FIG. 3, the display apparatus 100 further includes a configuration in which audio data included in each content is differently provided for each user when operating in the multi-view mode. That is, a demultiplexer (not shown) for separating the image data and the audio data from the content received by each of the receivers 110-1, 110-2, ..., 110-n, and an audio decoder for decoding the separated audio data. (Not shown), a modulator (not shown) for modulating the decoded audio data into different frequency signals, an output unit (not shown) for transmitting the modulated audio data to the spectacle device, and the like. Each audio data output from the output unit is provided to the user through output means such as earphones provided in the spectacle device. Since these configurations are not directly related to the present invention, a separate illustration is omitted.

In addition, the display apparatus 100 includes a plurality of receivers 110-1, 110-2,..., 110-n, and a plurality of signal processing units 120-1, 120-2,. In addition to the display 190, the controller may further include a controller (not shown), a synchronization signal generator (not shown), and an interface unit (not shown).

The controller (not shown) controls the overall operation of the display apparatus 100. That is, the plurality of receivers 110-1, 110-2,..., 110-n, the plurality of signal processors 120-1, 120-2,..., 120-n, and the display 190. Each of the synchronization signal generator and the interface unit may be controlled to perform a corresponding operation.

The synchronization signal generator (not shown) generates a synchronization signal for synchronizing the glasses apparatus corresponding to each content according to the display timing of each content. That is, the synchronization signal generator generates a synchronization signal for opening the shutter glass of the spectacle device at the time when the image frame of each content is displayed in the multi-view mode.

The interface unit (not shown) communicates with the spectacles. In this case, the interface unit may communicate with the eyeglasses device according to various wireless methods, and transmit a synchronization signal to the eyeglasses device.

For example, the interface unit may be provided with a Bluetooth communication module to communicate with the glasses device, and generate a synchronization signal as a transport stream according to the Bluetooth communication standard to transmit the glasses to the glasses device.

The transport stream includes time information for turning on / off the shutter glass of the spectacle device in synchronization with the display timing of the content. Specifically, the time information includes an offset time for turning on the left eye shutter glass of the spectacle device, a left shutter close offset for turning off the left eye shutter glass, and an offset time for turning on the right eye shutter glass. open offset), and information on the right shutter close offset of turning off the right eye shutter glass.

The offset time is delay information from the reference time set for each content to the on or off time of the shutter glass. That is, the spectacle apparatus turns on / off the left eye shutter glass and the right eye shutter glass when the offset time has elapsed from the reference time point.

For example, the reference time point may be a time point at which a vertical sync signal (ie, frame sync) is generated in an image frame, and information about the reference time point may be included in the transport stream. In addition, the transport stream may include information about a clock signal used in the display apparatus 100. Therefore, upon receiving the transport stream, the spectacle device synchronizes its clock signal with the clock signal of the display apparatus 100, and determines whether the offset time has elapsed from the time when the vertical synchronization signal is generated using the clock signal. The glass can be turned on / off.

In addition, the transport stream may further include information on the period of the frame sink, information for indicating the decimal point information when the period of the frame sink has a decimal point.

Meanwhile, the interface unit transmits / receives a Bluetooth device address, a pin code, and the like with the glasses device, and performs pairing according to a Bluetooth communication method.

When pairing is completed, information about the glasses device, for example, identification information unique to the glasses device, may be registered in the interface unit. The interface unit matches information about each eyeglass device to a transport stream corresponding to the display timing of each content, and transmits the transport stream to each eyeglass device based on the information obtained through pairing.

When the glasses device receives the transport stream, the glasses device may determine whether the glasses device corresponds to the glasses device information, and may turn the glasses on or off based on the time information included in the checked transport stream.

Although the above-described embodiment has been described that the interface unit and the spectacle device communicate according to the Bluetooth communication method, this is only an example. That is, in addition to the Bluetooth method, it is possible to use a communication method such as infrared communication, Zigbee, etc., and to perform communication according to various wireless communication methods capable of transmitting and receiving signals by forming a communication channel in other local areas. .

According to the above-described embodiments, even when a plurality of users views a plurality of contents, the image processing may be optimized for each of the contents without being affected by other contents, and the user may view the optimal image. .

In the case of providing a plurality of contents at the same time according to the above-described embodiment, when providing a backlight by analyzing a plurality of image frames at the same time as the conventional backlight providing apparatus, filtering to gradually change the brightness between each image frame In the filtering process, the optimum brightness required for each image frame cannot be provided due to the influence of the image frames of other adjacent contents. The backlight providing apparatus according to an embodiment of the present invention is to solve this problem.

5 is a block diagram illustrating a configuration of a backlight providing apparatus according to an exemplary embodiment.

Referring to FIG. 5, the backlight providing apparatus 300 may include a plurality of image analyzers 310-1, 310-2,..., 310-n, a light source 320, a backlight driver 330, and a backlight controller 340. ).

The plurality of image analyzers 310-1, 310-2,..., 310-n detect the luminance characteristic information of the image frame for each content view. In detail, each of the image analyzers 310-1, 310-2,..., 310-n receives image frames separated for each content view, and detects luminance characteristic information of the received image frames. Therefore, the number of image analyzers may vary depending on the number of content views displayed.

The plurality of image analyzers 310-1, 310-2,..., 310-n may detect, as luminance characteristic information, an average luminance value of each pixel constituting an image frame of content. The average luminance value means an average value of luminance values of each pixel constituting one image frame.

The luminance characteristic information may be not only an average luminance value, but also various values such as a maximum value, a minimum value, a median value, or a mode value among luminance values of each pixel.

In addition, each of the image analyzers 310-1, 310-2,..., 310-n may include a filtering unit (not shown) that performs filtering so that the backlight provided in each image frame is gradually changed. . The filtering unit (not shown) included in each of the image analyzers 310-1, 310-2,..., 310-n may perform filtering without being affected by an image frame of another content view.

The light source unit 320 provides a backlight to a display panel (not shown). The light source unit 320 may be implemented as a light emitting diode (LED-BLU), a cold cathode fluorescent lamp (CCFL), an external electrofluorescence lamp (EEFL), or the like.

On the other hand, the light source unit 320 provides a backlight to the display panel (not shown) on the back of the display panel (not shown), that is, the surface opposite to the surface on which the image is displayed.

The backlight driver 330 drives the light source 320 under the control of the backlight controller 340. In detail, the backlight driver 330 drives the light source 320 by generating a driving signal under the control of the backlight controller 340. The driving signal may be generated such that the brightness of the screen may be changed by adjusting the turn-on time and the turn-off time of the light source unit 320.

The backlight controller 340 controls the backlight driver 330. The backlight controller 340 may provide a backlight corresponding to luminance characteristic information of each image frame detected by the plurality of image analyzers 310-1, 310-2,..., 310-n for each of a plurality of content views. The backlight driver 330 is controlled.

In addition, the backlight controller 340 may control the overall operation of the backlight providing apparatus 300. In detail, the controller 340 may control each of the plurality of image analyzers 310-1, 310-2,..., 310-n and the backlight driver 330 to perform a corresponding operation. .

The backlight controller 340 determines the duty ratio for each of the plurality of content views using the luminance characteristic information of each image frame, and applies the driving signal according to the determined duty ratio to the light source unit. To control.

For example, if the luminance characteristic information of each detected image has a high value, the duty ratio may be set to be high, and if the duty ratio is high, the driving time of the backlight provided to the corresponding image frame becomes long, thereby allowing the viewer to watch a bright image frame. have. On the contrary, when the luminance characteristic information of each detected image has a low value, the duty ratio may be set low, and the viewer may watch a dark image frame because the driving time of the backlight provided to the corresponding image frame is shortened.

The duty ratio means the ratio of the time that the current flows to the time when the current does not flow in the pulse signal of one cycle. That is, in the case of the driving signal represented as a pulse signal, a pulse signal of one cycle is a time when one image frame is output, and is turned on for a time when the light source is turned off during the time when one image frame is output. on) means the ratio of time.

6 and 7 will be described in more detail with respect to the backlight providing apparatus according to an embodiment of the present invention.

6 is a diagram illustrating an operation of a plurality of image analyzers according to an exemplary embodiment.

Referring to FIG. 6, contents views 1 and 2 display contents corresponding to day and night images, respectively. Here, since there are two content views, the image analyzer 1 310-1 and the image analyzer 2 310-2 of the plurality of image analyzers 310-1, 310-2, ..., 310-n. Only the example will be explained. The image frame of the content corresponding to the daytime image to be displayed in the content view 1 is input to the image analyzer 1 310-1, and the image frame of the content corresponding to the night image to be displayed in the content view 2 is the image analyzer 2 ( 310-2).

The image analyzers 1 and 2 310-1 and 310-2 detect luminance characteristic information of each image frame of the received content. As described above, the luminance characteristic information may be an average value, a maximum value, a minimum value, a median value, or a mode value among luminance values of each pixel. For convenience of explanation, it is assumed that the luminance characteristic information is an average luminance value.

The image analyzer 1 310-1 detects a luminance value of each pixel in an image frame of a content corresponding to a daytime image, and detects an average luminance value using the luminance value of each pixel. As shown in FIG. 6, the average luminance value of the image frame corresponding to the daytime image may be higher than the average luminance value of the image frame corresponding to the nighttime image.

The image analyzer 2 310-2 detects a luminance value of each pixel in an image frame of a content corresponding to a night image, and detects an average luminance value using the luminance value of each pixel. As shown in FIG. 6, the average luminance value of the image frame corresponding to the night image may be lower than the average luminance value of the image frame corresponding to the daytime image.

7 is a view for explaining the operation of the backlight driver and the control unit according to an embodiment of the present invention.

The backlight controller 340 uses the average luminance values detected by the image analyzers 1 and 2 310-1 and 310-2 to determine the duty ratio of the image frame for each content view, that is, for the content views 1 and 2, respectively. Determine. For example, as shown in FIG. 4, since each image frame of the content view 1 has a high average luminance value, it is determined to have a relatively high duty ratio of 2: 1, and each image frame of the content view 2 Since it has a low average brightness value, it can be determined to have a relatively low duty ratio of 0.5: 1.

When the duty ratio is determined, the backlight controller 340 controls the backlight driver 330 to generate a driving signal according to the determined duty ratio. In detail, the backlight controller 340 generates a driving signal for driving the light source unit according to the display timing of each image frame of the content to be displayed in the content views 1 and 2 according to the duty ratio determined for each image frame. 330 may be controlled. The driving signal of FIG. 5 represents the driving signal generated according to the determined duty ratio. The section corresponding to the image frame to be displayed in the content view 1 has a high duty ratio, and the section corresponding to the image frame to be displayed in the content view 2 has a low duty ratio.

Meanwhile, the backlight driver 330 applies a driving signal to the light source unit 320 under the control of the backlight controller 340, and the light source unit 320 displays a display panel according to the display timing of each image frame according to the driving signal. To provide backlight. Accordingly, as illustrated in FIG. 7, the image frame displayed in the content view 1 is bright on the display screen (not shown), and the image frame of the content displayed in the content view 2 is dark.

Accordingly, when the image frames of the plurality of contents are alternately arranged and displayed, the image frames of the respective contents may be displayed at the optimum brightness without being affected by the image frames of the other contents.

Meanwhile, the backlight providing apparatus 300 may be included in the display apparatus 100 to operate the backlight providing apparatus 300 and may provide a backlight to a display panel (not shown) of the display apparatus 100. The display apparatus 100 including the backlight providing apparatus 300 will be described with reference to FIG. 8.

8 is a block diagram illustrating a configuration of a display apparatus according to another exemplary embodiment. Since the configuration of the display apparatus has been described in detail with reference to FIG. 3, a description will be given based on differences.

Referring to FIG. 8, the display apparatus 100 includes a plurality of receivers 110-1, 110-2,..., 110-n, and a plurality of signal processors 120-1, 120-2,. -n), the mux unit 130, the panel unit 140, the data separation unit 150, the plurality of image analyzers 160-1, 160-2, ..., 160-n) backlight unit 170 and The backlight controller 180 is included. The display device 100 may be implemented as various devices including a display unit such as a TV, a mobile phone, a PDA, a notebook PC, a monitor, a tablet PC, an e-book, an electronic picture frame, a kiosk, and the like.

The mux unit 130 multiplexes image frames of a plurality of contents. In detail, the mux unit 130 may multiplex and output the image frames such that the image frames of the plurality of contents configured in the signal processing unit are alternately arranged at least one by one.

The panel unit 140 displays the multiplexed image frame. Accordingly, the panel unit 140 may be displayed in a form in which multiplexed image frames output from the mux unit 130 are alternately arranged at least one by one.

Meanwhile, the panel unit 140 may include a display panel (not shown) composed of a plurality of pixels to display an image frame, and a panel driver (not shown) for driving the display panel under the control of the controller 180. have.

The data separator 150 separates the image frames multiplexed by the mux unit 130 for each content view. That is, the data separating unit 150 receives the image frames of the plurality of contents provided to the panel unit 140, separates the image frames of the respective contents for each content view, and displays each image analyzing unit 160-1, 160-2, ..., 160-n).

The plurality of image analyzers 160-1, 160-2,..., 160-n detect luminance characteristic information of each image frame separated for each content view. The plurality of image analyzers 160-1, 160-2,..., 160-n may include the plurality of image analyzers 310-1, 310-2,..., 310-of the backlight providing apparatus 300. n), and therefore, descriptions of specific operations will be omitted.

The backlight unit 170 provides a backlight to the panel unit 140. Specifically, the backlight unit 170 may provide a backlight to the display panel (not shown) of the panel unit 140.

The backlight unit 170 may include a light source unit (not shown) for providing a backlight to the display panel (not shown) and a backlight driver (not shown) for driving the light source unit (not shown). The light source unit and the backlight driver of the backlight unit 170 respectively correspond to the light source unit 320 and the backlight driver 330 of the backlight providing apparatus 300, and thus, a detailed description thereof will be omitted.

The backlight controller 180 controls the backlight 170. The backlight controller 180 controls the backlight unit 170 to provide a backlight corresponding to the luminance characteristic information of the image frame of each content view in cooperation with the plurality of content views displayed on the panel unit 140.

In addition, the backlight controller 180 may control the backlight unit 170 to determine the duty ratio for each of the plurality of content views using the luminance characteristic information of each image frame and to apply a driving signal according to the determined duty ratio.

Although not shown in FIG. 6, the backlight controller 180 may control the overall operation of the display apparatus 100 as well as the backlight 170. In detail, the controller 180 includes a plurality of receivers 110-1, 110-2,..., 110-n, and a plurality of signal processors 120-1, 120-2,. , The mux unit 130, the panel unit 140, the data separator 150, the plurality of image analyzers 160-1, 160-2,..., 160-n and the backlight unit 170, respectively. By controlling, the corresponding operation may be performed.

The backlight controller 180 corresponds to the controller 140 of the backlight providing apparatus 300, and thus, a description of the specific operation will be omitted.

In the above description, the backlight corresponding to each image frame is provided for each content view by detecting luminance characteristic information for each of the plurality of content views. However, the backlight may be provided in consideration of the influence of the image frame of another adjacent content view. have. For example, when a duty ratio difference with an image frame of another adjacent content view is greater than a preset value in the process of generating a driving signal, the determined duty ratio is changed to generate a driving signal according to the changed duty ratio to provide a backlight. You can do it.

Meanwhile, in the display apparatus 100 described with reference to FIG. 8, it has been described that the backlight providing apparatus 300 receives the image frame by separating the multiplexed image frame for each content view from the data separator 150. However, the backlight providing apparatus 300 may receive an image frame directly from the signal processing units 120-1, 120-2,..., 120-n. In this case, the data separating unit 150 Can be omitted. In addition, each of the plurality of image analyzers 160-1, 160-2,..., 160-n is included in the plurality of signal processing units 120-1, 120-2,. The corresponding function may be performed or the corresponding functions may be performed by the plurality of signal processing units 120-1, 120-2,..., 120-n.

9 is a flowchart illustrating a control method of a display apparatus according to an exemplary embodiment.

According to FIG. 9, the display method receives a plurality of contents, respectively (S910). The received content is processed to form an image frame (S920). In detail, configuring the image frame may include performing decoding on the image data included in the received content, performing scaling on the decoded image data, and converting a frame rate of the image data. can do. Since a detailed method of configuring the image frame has been described in detail with reference to FIGS. 3 and 4, it will be omitted.

In operation S930, the image frames of the configured contents are combined and displayed.

Accordingly, by receiving a plurality of contents and signal processing, it is possible to prevent the influence of other contents in the signal processing process, thereby enabling optimal signal processing.

10 is a flowchart illustrating a control method of a backlight providing apparatus according to an exemplary embodiment.

Referring to FIG. 10, in the backlight providing method according to an embodiment of the present disclosure, luminance characteristic information of an image frame included in each content view is detected (S1010). In detail, when a plurality of contents combined in units of image frames is input, image frames of respective contents are separated for each content view, and brightness characteristic information of image frames included in each content view is detected. In operation S1020, a backlight corresponding to luminance characteristic information of each image frame is provided for each content view. The providing of the backlight (S1020) may include determining a duty ratio for each of a plurality of content views using luminance characteristic information of each image frame, generating a driving signal having the determined duty ratio, and driving the backlight. Applying a signal to the light source to provide a backlight.

The luminance characteristic information may be an average luminance value of pixels constituting the image frame. Meanwhile, as described above, the luminance characteristic information may be not only an average luminance value but also a maximum value, a minimum value, a median value, or a mode value among the luminance values of each pixel.

Meanwhile, the program for performing the method according to various embodiments of the present disclosure described above may be stored and used in various types of recording media.

Specifically, the code for carrying out the above-described methods may be stored in a memory such as a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an Electronically Erasable and Programmable ROM (EEPROM), a hard disk, And may be stored in various types of nonvolatile recording media such as a USB memory, a CD-ROM, and the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100: display device
110-1, 110-2, ..., 110-n: a plurality of receivers
120-1, 120-2, ..., 120-n: a plurality of signal processing units
121-1: decoder 122-1: scaler unit
123-1: frame rate converter 130: mux
140: panel unit 150: data separation unit
160-1, 160-2, ..., 160-n: a plurality of image analyzers
170: backlight 180: control unit
190: display unit
200: glasses device 300: backlight providing device
310-1, 310-2, ..., 310-n: a plurality of image analysis unit
320: light source unit 330: backlight driving unit
340:

Claims (12)

A plurality of image analyzers detecting luminance characteristic information of an image frame for each content view;
A light source unit for providing a backlight to the display panel;
A backlight driver for driving the light source unit; And
And a controller configured to control the backlight driver to provide a backlight corresponding to the detected luminance characteristic information for each of the plurality of content views. The method of claim 1,
The control unit,
And determining a duty ratio for each of the plurality of content views using the luminance characteristic information of each image frame, and controlling the backlight driver to apply a driving signal according to the determined duty ratio to the light source unit. Back light providing device. The method of claim 2,
The plurality of image analyzers,
And an average luminance value of each pixel constituting the image frame of the content as the luminance characteristic information. When a plurality of contents combined in units of image frames is input, separating image frames of respective contents for each content view and detecting brightness characteristic information of the image frame included in each content view; And
And providing a backlight corresponding to the detected luminance characteristic information for each content view. 5. The method of claim 4,
Providing the backlight,
Determining a duty ratio for each of the plurality of content views by using brightness characteristic information of each image frame;
Generating a drive signal having the determined duty ratio; And
And providing the backlight by applying the driving signal to a backlight unit. The method of claim 5,
The brightness characteristic information,
And a mean luminance value of pixels constituting each image frame. A plurality of receivers each receiving a plurality of contents;
A plurality of signal processing units configured to process the plurality of received contents to form an image frame;
A mux unit for multiplexing image frames of a plurality of contents configured in the signal processing unit;
A panel unit for displaying the multiplexed image frame;
A data separator for separating image frames of the plurality of contents provided to the panel unit for each content view;
A plurality of image analyzers detecting luminance characteristic information of each of the image frames separated for each content view;
A backlight unit for providing a backlight to the panel unit; And
And a controller configured to control the backlight unit to provide a backlight corresponding to luminance characteristic information of an image frame of each content view in association with the plurality of content views displayed on the panel unit. The method of claim 7, wherein
The control unit,
And controlling the backlight unit to determine a duty ratio for each of the plurality of content views using the luminance characteristic information of each image frame and to apply a driving signal according to the determined duty ratio. 9. The method of claim 8,
The plurality of image analyzers,
And an average luminance value of each pixel constituting the image frame of the content as the luminance characteristic information. The method of claim 7, wherein
Each of the plurality of signal processing units,
A decoder for decoding the image data included in the received content;
A scaler that performs scaling on the decoded image data; And
And a frame rate converter for converting the frame rate of the image data. In the display method for providing a plurality of content to a plurality of users,
Receiving a plurality of contents, respectively;
Constructing an image frame by processing contents received by the plurality of receivers, respectively; And
And combining and outputting image frames of respective contents configured in the plurality of signal processing units. The method of claim 3,
Comprising the image frame,
Decoding the image data included in the received content;
Performing scaling on the decoded image data; And
And converting the frame rate of the image data.

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