JP5264226B2 - Display device, image output device, display device control method, and image output device control method - Google Patents

Description

The present invention relates to a display device that outputs a video signal having any one of a plurality of frame frequencies , an image output device , a display device control method, and an image output device control method .

In recent years, video playback devices and display devices that can input and output video at a frame frequency of 24 Hz have started to appear in consumer AV equipment. Patent Document 1 discloses a playback device having an output function with a frame frequency of 24 Hz.
JP 2006-2222938 A

  However, in the above-described conventional technique, when the image reproduction is performed at the frame frequency of 24 Hz, if the image quality setting of the display device is a high brightness and vivid setting, the judder may be emphasized more than necessary and may cause a disturbance. . For this reason, the displayed video does not necessarily have a desirable image quality.

Accordingly, the present invention provides a display device, an image output device , a display device control method, and an image output device control method capable of reducing the feeling of interference when viewing video by judder when displaying a video with high brightness. The purpose is to do.

In order to achieve the above object, a display device of the present invention is a display device connected to an image output device that outputs a video signal, the input means for inputting the video signal from the image output device, and the video One of a plurality of image quality modes including a display means for displaying an image based on a signal, a first image quality mode, and a second image quality mode for displaying lower brightness than the first image quality mode is selected. And changing the frame frequency of the video signal when the image quality mode selected by the selection unit is the first image quality mode and the frame frequency of the video signal is an integer multiple of 24 Hz. And control means for outputting an instruction signal for instructing the image output apparatus to the image output apparatus.

According to the onset bright, it is possible to change the frame frequency suitable for the image quality mode, when displaying an image with high luminance such as a dynamic mode, it is possible to reduce interference sensation during image viewing by judder. Therefore, the user can preferably view the video.

Will be described with reference to the drawings implementation of the present invention. Image control apparatus according to the present embodiment is applied to a video display system.

[First Embodiment]
FIG. 1 is a block diagram showing the configuration of the video display system in the first embodiment. The video display system includes a video display device 100 and a video playback device 150, and performs video playback by connecting the video display device 100 and the video playback device 150.

  Here, for the signal transmission between the digital demodulation circuit 101 of the video display device 100 and the digital modulation circuit 151 of the video reproduction device 150, a digital interface for moving images such as HDMI (trademark) corresponding to the multi format is used. It is done. The video playback device 150 plays back content such as movies and music and outputs a video signal to the video display device 100. The frame frequency of content output as a video signal is, for example, 24 Hz or 60 Hz.

  The video reproduction device 150 includes a data reading unit 161, a data storage device 164, a demodulation unit 171, a frame frequency conversion unit 172, a setting unit 181, a digital modulation circuit 151, and a digital interface (I / F) 155.

  The data storage device 164 records / stores data on an optical disc such as a Blu-ray Disk or HD DVD (trademark). The data reading unit 161 reads data recorded on an optical disk such as a Blu-ray Disk or HD DVD (trademark) in the data storage device 164, or an HDD or flash memory connected via a LAN or USB. Data read by the data reading unit 161 is MPEG-2, H.264, or the like. It is compressed with a compression format such as H.264 / AVC or VC-1.

  The demodulator 171 demodulates the data read by the data reader 161 into video data or the like.

  The setting unit 181 includes an input unit 181a and performs setting of each unit of the video reproduction device 150 by a GUI operation or the like by the user. The setting unit 181 also sets the video frame frequency of the frame frequency conversion unit 172. The setting unit 181 is provided with an external remote controller 191 that can be operated in substantially the same manner as the main body. The external remote controller 191 is also used to select an image quality mode and to instruct a change operation of a frame frequency to an input unit 131a of an image quality mode setting unit 131 (to be described later) on the video display device 100 side.

  The frame frequency conversion unit 172 converts the frame frequency of the video, and changes the frame frequency such as from 24 Hz (second frequency) to 60 Hz (first frequency) or from 60 Hz to 24 Hz. The frame frequency conversion unit 172 can also output through, such as 24 Hz as it is 24 Hz, or 60 Hz as it is as 60 Hz.

  The digital modulation circuit 151 performs digital modulation of video data. As described above, the digital interface (I / F) 155 (second communication unit) is a digital interface for moving images, such as HDMI (trademark), that supports multi-format. Note that the digital interface is not limited to HDMI (trademark), and a video signal and a device control signal may be transmitted using different signal lines. The digital interface 155 transmits the digitally modulated video data to the video display device 100 and sends an instruction signal transmitted from the video display device 100 to the setting unit 181 as described later.

  On the other hand, the video display device 100 includes a digital I / F 105, a digital demodulation circuit 101, a video signal processing unit 111, a viewing environment determination unit 121, a message generation unit 122, a signal generation unit 125, an image quality mode setting unit 131, and a display control unit 141. And a display portion 142.

  As described above, the digital interface (I / F) 105 (first communication means) is a digital interface for moving images, such as HDMI (trademark), that supports multi-format. Note that the digital interface is not limited to HDMI (trademark), but may be compatible with the digital I / F 155 and may transmit video signals and device control signals using separate signal lines. The digital interface 105 receives the digitally modulated video data transmitted from the video reproduction device 150 and transmits the instruction signal generated by the signal generation unit 125 to the video reproduction device 150 as described later.

  The video signal processing unit 111 performs signals such as gradation correction, color correction, I / P conversion, contour correction, noise reduction, and α synthesis on the video signal from the video reproduction device 150 demodulated by the digital demodulation circuit 101. Process.

  The image quality mode setting unit 131 provides a plurality of image quality modes so that the optimum image quality can be obtained depending on the usage scene, such as the type of content and viewing environment, and video signal processing is performed on each image quality parameter by GUI operation via the input unit 131a. Set in the unit 111 and the display control unit 141. In addition, the image quality mode setting unit 131 (mode selection unit) sends the image quality mode selected by the GUI operation or the like to the viewing environment determination unit 121.

  In the present embodiment, the image quality mode setting unit 131 presets image quality modes with the names “dynamic”, “standard”, and “cinema”, and each parameter is changed by a user GUI operation or the like.

  When the image quality mode is set to “cinema” (second mode), the movie content is displayed suitable for viewing in the theater environment, the brightness and contrast are kept low, and the video is reproduced with a calm tone. On the other hand, when the image quality mode is set to “dynamic” (first mode), the display is suitable for a bright viewing environment such as a storefront, and an image is reproduced with high brightness and vivid color image quality. Thus, the first mode is a display with higher luminance than the second mode, which is a display with low luminance.

  The viewing environment determination unit 121 receives data such as the video format and frame frequency of the video signal from the digital demodulation circuit 101, and sets the set values such as the image quality mode, brightness, and color temperature set by the image quality mode setting unit 131. Receive and make a decision.

  In the viewing environment determination unit 121, the message generation unit 122 generates a message that prompts the video reproduction device 150 to change the frame frequency when the image quality mode is “dynamic” and the frame frequency of the video format is 24 Hz. . Similarly, when the image quality mode is “dynamic” and the frame frequency of the video format is 24 Hz in the viewing environment determination unit 121, the signal generation unit 125 controls the digital I / F 105 to reproduce the video. An instruction signal to be transmitted to the device 150 is generated. For example, when the digital I / F 105 is configured with HDMI (trademark), a CEC (Consumer Electronics Control) signal that is a device control signal is used as the instruction signal. This instruction signal is a signal that is input to the setting unit 181 of the video reproduction device 150 and instructs to automatically change the frame frequency.

  The display control unit 141 (display control unit) receives a desired video signal from the video signal processing unit 111 and converts it into a signal suitable for the driving method of the display unit 142. For example, when the frame frequency of the video signal input to the video signal processing unit 111 is 24 Hz and the drive frequency of the display unit 142 is 120 Hz, the display control unit 141 converts the frame frequency from 24 Hz to 120 Hz. As the display unit 142, a flat panel having a digital interface such as a PDP, an LCD, an organic EL, and an FED is used.

  The operation of the video display system having the above configuration will be described. FIG. 2 is a flowchart showing an operation procedure of the video display apparatus 100. This process is mainly performed by the viewing environment determination unit 121. The viewing environment determination unit 121, the message generation unit 122, and the signal generation unit 125 correspond to the control means described in the claims.

  First, the video display device 100 waits until a video signal is detected by the digital demodulation circuit 101 that is an input of the video display device 100 via the digital I / F 105 (step S1).

  When the video signal is detected, the video display device 100 determines the frame frequency and the image quality mode of the video signal. That is, the video display apparatus 100 determines whether or not the frame frequency is an integer multiple of 24 Hz (step S2). In the present embodiment, a frame frequency of 24 Hz is described, but the same applies to a frame frequency of 48 Hz or the like. If the frame frequency is an integer multiple of 24 Hz, it is further determined whether or not the image quality mode is the dynamic mode (step S3).

  As a result of the determination, when the frame frequency is 24 Hz and the image quality mode is “dynamic”, the video display device 100 sends a message to the display unit 142 so as to change the frame frequency of the video playback device 150 to another frequency. Control to display is performed (step S4). Specifically, the display unit 142 performs GUI display (guide display) with a content such as “We recommend changing the frame frequency to 60 Hz!”.

  The video display apparatus 100 determines whether or not a frame frequency changing operation has been performed according to the message (step S5). When the change operation instruction is given, the video display apparatus 100 transmits an instruction signal for instructing the video reproduction apparatus 150 to change the frame frequency (step S6). Thereafter, the video display apparatus 100 returns to the process of step S1. On the other hand, when the change operation instruction is not performed in step S5, the video display apparatus 100 returns to the process of step S1 as it is.

  As described above, when the user looks at the GUI display on the display unit 142 and changes the frame frequency according to this message, the external remote controller 191 or the like is input to the input unit 131a in the image quality mode setting unit 131 of the video display device 100. Operate with. In the video display device 100, when the viewing environment determination unit 121 receives this operation, the signal generation unit 125 generates an instruction signal, controls the digital I / F 105, and transmits the instruction signal to the video reproduction device 150. As will be described later, when the instruction signal is received by the digital I / F 155 on the video playback device 150 side, even if the frame frequency of the content is 24 Hz by the frame frequency conversion unit 172, the frame frequency of the video output is It is changed to 60 Hz.

  Note that the user can also operate the input unit 181a in the setting unit 181 of the video reproduction device 150 with the external remote controller 191 or the like when changing the frame frequency. As a result, even if the frame frequency of the content is 24 Hz, the frame frequency of the video output can be changed to 60 Hz by the frame frequency conversion unit 172.

  On the other hand, when the image quality mode is not “dynamic” in step S3, the video display apparatus 100 stops the GUI display (guide display) of the message prompting the change of the frame frequency (step S7). Thereafter, the video display apparatus 100 returns to the process of step S1.

  FIG. 3 is a flowchart showing an operation procedure of the video reproduction apparatus 150. The video reproduction device 150 determines whether or not an instruction signal for instructing the change of the frame frequency is received from the video display device 100 or from the setting unit 181 via the digital I / F 155 (step S11). When the instruction signal is received, the video reproduction device 150 automatically changes the frame frequency set in the frame frequency conversion unit 172 (step S12). Thereafter, the video reproduction device 150 ends this process.

  FIG. 4 is a diagram showing frame frequency conversion. FIG. 4A shows the conversion of the frame frequency when the video content having a frame frequency of 24 Hz is displayed on the video display device 100 driven by 120 Hz. FIG. 5B shows an example of frame interpolation when the frame frequency of a 60 Hz video signal output from the video playback device 150 is changed according to the image quality mode. FIG. 3C shows an example of frame interpolation in the case where the frame frequency of the 24 Hz video signal output from the video playback device 150 is changed according to the image quality mode.

  As shown in FIG. 6A, when the image quality mode is “cinema”, the video playback device 150 outputs video with 24 Hz. And the video display apparatus 100 will convert into the frame frequency of 120 Hz by displaying the same frame image 5 times repeatedly, if the video signal of 24 Hz is input. Thus, in FIG. 9A, since smooth interpolation frame generation is not performed, even the judder feeling peculiar to movies is accurately reproduced, and cinema reproduction closer to the original becomes possible.

  On the other hand, as shown in FIG. 5B, when the image quality mode is “dynamic”, the video reproduction device 150 converts the frame frequency from 24 Hz to 60 Hz and outputs a 60 Hz video signal. Then, the video display device 100 converts the frame frequency from 60 Hz to 120 Hz. At that time, intermediate frames a1 ', a2', and a3 'having smooth motion are generated from the front and rear frames.

  FIG. 6C shows a frame frequency conversion process when the image quality mode is “dynamic” and the video reproduction apparatus 150 outputs a video signal of 24 Hz. If the video display device 100 can convert the frame frequency by frame interpolation, the video signal of 24 Hz is converted to a smooth (judderless) 120 Hz video signal, and the video is displayed at 120 Hz. At this time, intermediate frames a2 ', a3', a4 ', and a5' having smooth motion are generated from the front and rear frames.

  As a result, when a content having a frame frequency of 24 Hz is viewed in “dynamic” with higher brightness, judder does not stand out more than necessary even in a scene with movement between frames, and the feeling of interference is reduced.

  As described above, in the video display system according to the first embodiment, the following operation is performed. When the viewing environment determination unit 121 in the video display apparatus 100 determines that judder interference may be noticeable from the frame frequency of the video signal input from the outside and the set image quality mode, the frame frequency of the video signal A GUI (guide) display that prompts the user to change is displayed. When the user instructs the change of the frame frequency according to the GUI display, the video display device 100 transmits an instruction signal for instructing the video reproduction device 150 to change the frame frequency. When receiving this instruction signal, the video reproduction device 150 changes the frame frequency of the video signal output to the video display device 100 by the frame frequency conversion unit 172. Thereby, it is possible to change to a frame frequency suitable for the image quality mode, and when displaying a video with high luminance as in the dynamic mode, it is possible to reduce a feeling of interference when the video is viewed by judder. Therefore, the user can preferably view the video. In addition, the user can be prompted to change the frame frequency, and the intention of the user can be reflected when the frame frequency is changed.

[Second Embodiment]
FIG. 5 is a block diagram showing the configuration of the video display system in the second embodiment. In the video display device 100 of the second embodiment, an external light detection unit 132 is further added as compared to the first embodiment. For the external light detection unit (external light sensor) 132, for example, an illuminance sensor, an RGB sensor, a spectral sensor, a camera, or the like is used. The external light detection unit 132 detects the brightness of the room in which the video display device 100 is installed and the color temperature of the illumination light source. Since other configurations are the same as those of the first embodiment, the description thereof is omitted by giving the same reference numerals.

  In the second embodiment, the viewing environment determination unit 121 performs judder interference based on the ambient brightness detected by the external light detection unit 132 in addition to the image quality mode set by the image quality mode setting unit 131. Determine the conspicuous conditions.

  FIG. 6 is a flowchart showing an operation procedure of the video display apparatus 100. This process is mainly performed by the viewing environment determination unit 121. About the same step process as the said 1st Embodiment, the description is abbreviate | omitted by using the same step number.

  When the frame frequency is an integral multiple of 24 Hz in step S2 and the image quality mode is the dynamic mode in step S3, the video display device 100 determines that the ambient brightness detected by the external light detection unit 132 is less than a predetermined value. Is determined (step S3A). If the ambient brightness is less than the predetermined value, the video display apparatus 100 proceeds to the process of step S4 and causes the display unit 142 to display a message so as to change the frame frequency of the video reproduction apparatus 150 to another frequency. Take control. On the other hand, when the ambient brightness is not less than the predetermined value, the video display apparatus 100 returns to the process of step S1. In step S3A, the determination may be made based on the color temperature instead of the ambient brightness or together with the ambient brightness.

  FIG. 7 is a table used to determine the frame frequency of the video signal output from the video playback device 150. This table is stored in the viewing environment determination unit 121. Based on this table, the frame frequency of the video signal output from the video playback device 150 is determined by the image quality mode set by the image quality mode setting unit 131, the brightness detected by the external light detection unit 132, and the demodulation unit 171. It is determined according to the detected frame frequency. In particular, when the frame frequency of the content is 24 Hz, the image quality mode is the dynamic mode, and the external light is less than 200 lux (lx), the frame frequency of the video signal output from the video playback device 150 is determined to be 60 Hz. Is done.

  On the other hand, the operation on the video playback device 150 side is the same as that in the first embodiment. That is, when receiving the instruction signal, the video reproduction device 150 changes the frame frequency of the video signal output from the video reproduction device 150 by the frame frequency conversion unit 172.

  In the video display system of the second embodiment, the video display device 100 allows the user to play judder when the brightness of the installed room is dark and the image quality mode is a dynamic mode setting that emphasizes video reproduction. Judge that there is a high risk of perception. Then, the video display device 100 performs guide display using a GUI or the like so as to change to a preferable frame frequency. In this way, the viewing environment such as ambient brightness can be taken into consideration, and the feeling of interference during video viewing by judder can be reduced more appropriately.

[Third Embodiment]
FIG. 8 is a block diagram showing the configuration of the video display system in the third embodiment. In the video display device 100 of the second embodiment, the message generation unit 122 is omitted as compared to the second embodiment. Further, a frequency changing unit 123 is provided instead of the viewing environment determining unit 121 and the signal generating unit 125. The frequency changing unit 123 stores the table shown in FIG.

  Further, the digital modulation circuit 151 and the digital I / F 155 of the video reproduction device 150 are omitted, and an interface 152 made of HDMI (trademark) is provided instead. Further, the digital demodulation circuit 101 and the digital I / F 105 of the video display device 100 are omitted, and an interface 102 made of HDMI (trademark) is provided instead. Therefore, the video display device 100 and the video playback device 150 are connected by an interface 102 made of HDMI (trademark) and an interface 152 made of HDMI (trademark). A CEC signal is used as an instruction signal from the video display device 100 to the video playback device 150. Since other configurations are the same as those of the second embodiment, the description thereof is omitted by giving the same reference numerals.

  FIG. 9 is a flowchart showing an operation procedure of the video display apparatus 100. This process is mainly performed by the frequency changing unit 123. About the same step process as the said 2nd Embodiment, the description is abbreviate | omitted by using the same step number.

  When the ambient brightness detected in step S3A is less than the predetermined value, the video display device 100 instructs to change the frame frequency in step S6 without performing control to display the GUI image on the display unit 142. The signal is transmitted to the video reproduction device 150.

  On the other hand, the operation on the video playback device 150 side is the same as that in the first embodiment. That is, when receiving the instruction signal, the video reproduction device 150 changes the frame frequency of the video signal output from the video reproduction device 150 by the frame frequency conversion unit 172. That is, when the frame frequency of the video recorded on the Blu-ray Disk is 24 Hz, the image quality mode is the dynamic mode, and the detection value of the external light sensor 132 is less than 200 lx, the output frame frequency of the video reproduction device is 24 Hz. Automatically changes from 60 Hz to 60 Hz.

  As described above, in the video display system according to the third embodiment, the video display device 100 displays the image prompting the change of the frame frequency and accepts the change operation instruction from the user, without receiving an instruction for the change operation from the user. Instructs to automatically change the frame frequency. Accordingly, the output frame frequency of the video reproduction device 150 can be automatically and promptly changed according to the viewing environment such as the frame frequency of the content, the image quality mode of the video display device 100, and the brightness of the room.

  The present invention is not limited to the configuration of the above-described embodiment, and any configuration can be used as long as the functions shown in the claims or the functions of the configuration of the present embodiment can be achieved. Is also applicable.

  For example, even when the frame frequency is automatically changed, a message indicating that the frame frequency has been automatically changed may be displayed on the display unit as an image. Thereby, the user can know the change.

  In the above-described embodiment, the case where the frame frequencies are 24 Hz and 60 Hz is shown, but it is needless to say that the frame frequencies are not limited to these.

It is a block diagram which shows the structure of the video display system in 1st Embodiment. 3 is a flowchart showing an operation procedure of the video display apparatus 100. 5 is a flowchart showing an operation procedure of the video reproduction device 150. It is a figure which shows conversion of a frame frequency. It is a block diagram which shows the structure of the video display system in 2nd Embodiment. 3 is a flowchart showing an operation procedure of the video display apparatus 100. 4 is a table used to determine the frame frequency of a video signal output from the video playback device 150. It is a block diagram which shows the structure of the video display system in 3rd Embodiment. 3 is a flowchart showing an operation procedure of the video display apparatus 100.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Video display apparatus 102,152 Interface 150 Video | video reproduction apparatus 121 Viewing environment determination part 122 Message generation part 123 Frequency change part 125 Signal generation part 131 Image quality mode setting part 132 Ambient light detection part 141 Display control part 142 Display part 155,165 Digital Interface (I / F)
172 Frame frequency conversion unit 181 Setting unit 191 External remote control

Claims (10)

A display device connected to an image output device that outputs a video signal,
Input means for inputting the video signal from the image output device;
Display means for displaying an image based on the video signal;
Selection means for selecting any one of a plurality of image quality modes including a first image quality mode and a second image quality mode for displaying lower brightness than the first image quality mode;
When the image quality mode selected by the selection means is the first image quality mode and the frame frequency of the video signal is an integer multiple of 24 Hz, the change of the frame frequency of the video signal is made to the image output device. A display device comprising: control means for outputting an instruction signal to instruct the image output device. Comprising an operation means for inputting an operation of changing the frame frequency;
The control means displays an image prompting the change of the frame frequency on the display means, and outputs the instruction signal to the image output device when the operation of changing the frame frequency is input. The display device according to claim 1. Comprising detection means for detecting the brightness around the display device;
The control means is such that the image quality mode selected by the selection means is the first image quality mode, the frame frequency of the video signal is an integral multiple of 24 Hz, and the brightness detected by the detection means is The display device according to claim 1, wherein the instruction signal is output to the image output device when the value is less than a predetermined value. Wherein, wherein when if the image quality mode selected by the selection means is the second image quality mode, or the frame frequency before Kiutsu image signal is 60Hz, the change in the frame frequency of the video signal 3. The display device according to claim 1, wherein an instruction signal for instructing the image output device is not output to the image output device. An image output device connected to the display device according to any one of claims 1 to 4,
A communication means for receiving an instruction signal from the display device;
An image output apparatus comprising: changing means for changing a frame frequency of the video signal output to the display device in accordance with the received instruction signal. A method of controlling a display device connected to an image output device that outputs a video signal,
An input step in which the communication means of the display device inputs the video signal from the image output device;
A display step in which display means of the display device displays an image based on the video signal;
A selection step in which the selection unit of the display device selects any one of a plurality of image quality modes including a first image quality mode and a second image quality mode for performing lower-luminance display than the first image quality mode; ,
When the image quality mode selected in the selection step is the first image quality mode and the frame frequency of the video signal is an integer multiple of 24 Hz, the control means of the display device controls the frame frequency of the video signal. And a control step of outputting an instruction signal for instructing the image output device to change the image output device to the image output device. The operation means of the display device has an operation step of receiving an input of the change operation of the frame frequency,
The control means of the display device displays an image prompting the change of the frame frequency on the display means in the control step, and when the change operation of the frame frequency is inputted, the instruction signal is sent to the image output device. The display device control method according to claim 6, wherein the display device is output to the display device. The detection means of the display device has a detection step of detecting the brightness around the display device,
The control means of the display device has the image quality mode selected by the selection means in the control step is the first image quality mode, and the frame frequency of the video signal is an integer multiple of 24 Hz, and the detection 8. The method of controlling a display device according to claim 6, wherein the instruction signal is output to the image output device when the brightness detected by the means is less than a predetermined value. Control means of said display device, in the control step, when said selecting means image quality mode selected by is the second image quality mode, or when the frame frequency before SL video signal is 60Hz, the 8. The display device control method according to claim 6, wherein an instruction signal for instructing the image output device to change the frame frequency of the video signal is not output to the image output device. A control method for an image output device connected to the display device to which the control method for a display device according to any one of claims 6 to 9 is applied,
A communication step in which the communication means of the image output device receives an instruction signal from the display device;
A method for controlling an image output device, comprising: a changing step for changing a frame frequency of the video signal output to the display device in accordance with the received instruction signal.

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