JP2018185460A - Video generation system, video signal generation device, and display device - Google Patents

Abstract

Kind Code: A1 A display device having a display section composed of a plurality of pixels and a backlight provided corresponding to one or more pixels of the display device does not need to generate a backlight control signal on the side of the display device. To enable display of dynamic images. A video signal generation unit includes a video signal generation unit that generates a video signal, a backlight control data generation unit that generates backlight control data from the video signal, and arranges the generated video signal in an effective video area. and an SDI signal generator for converting the generated backlight control data into an SDI signal arranged in the blanking area and outputting the SDI signal. On the other hand, the display device includes an SDI separating section for separating the video signal and the backlight control data from the SDI signal, a display control section for controlling each pixel of the display section based on the video signal, and a backlight control data based on the backlight control data. and a backlight control unit for controlling the backlight. [Selection drawing] Fig. 1

Description

  The present invention relates to a video generation system, and more particularly to a video generation system including a display device that displays a dynamic video by performing local dimming control.

  In recent years, in a liquid crystal display device, which is a display device using liquid crystal, HDR (high dynamic range) images are generated by performing local deming control that individually controls the light emission states of a plurality of light emitting units constituting a backlight. A technique is known (Patent Document 1). Local deming control is rapidly spreading as a means for realizing richer and more powerful video expression.

  In order to perform local dimming control, a backlight control signal which is a signal for individually controlling a plurality of light emitting units is required in addition to a normal video signal. The backlight control signal is usually generated based on the video signal received on the display device side that has received the video signal.

  In addition to the display device, the video generation system includes a video signal generation device that generates a video signal by a technique such as shooting or composition. The video signal generation device and the display device are connected by some signal transmission means. Has been.

Japanese Patent Laying-Open No. 2015-4843

  In such a video generation system, when the backlight control signal is generated by the display device on the reception side as in the prior art, it is necessary to separately prepare a complicated processing circuit and program on the reception device side. However, in a video generation system such as a business camera equipped with a display device such as a VF (view finder), it is strongly desirable that the VF on the receiving side is configured to be small, so a configuration for generating a backlight signal There is not enough room to incorporate. In addition, in a video generation system that displays the same video signal on a plurality of display devices, it is necessary to provide a configuration for generating a backlight signal in each of a plurality of display devices on the receiving side, resulting in duplicate costs. There is a problem.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to display a dynamic image by local deming control in a liquid crystal display device without the need to generate a backlight control signal on the receiving side. It is to make it possible.

  In order to solve the above problem, an aspect of the present invention provides a video signal generation unit that generates a video signal, a backlight control data generation unit that generates backlight control data from the generated video signal, An SDI signal generating unit that arranges a generated video signal in an effective video area, converts the generated backlight control data into an SDI signal arranged in a blanking area, and outputs the SDI signal; is there.

  Another embodiment of the present invention is a display device including a display unit including a plurality of pixels and a backlight provided corresponding to one or more pixels of the display unit. Is arranged, and from the SDI signal in which the backlight control data is arranged in the blanking area, the SDI separation unit for separating the video signal and the backlight control data, and each pixel of the display unit is controlled based on the separated video signal And a backlight control unit that controls the backlight based on the separated backlight control data.

  According to another aspect of the present invention, a video signal generation unit that generates a video signal, a backlight control data generation unit that generates backlight control data from the generated video signal, and the generated video signal are enabled. A video signal generation device having an SDI signal generation unit arranged in a video region, converting the generated backlight control data into an SDI signal arranged in a blanking region and outputting the SDI signal; and a display unit comprising a plurality of pixels A display device having a backlight provided corresponding to one or more pixels of the display unit, wherein the video signal is arranged in the effective video area and the backlight control data is arranged in the blanking area. An SDI separation unit that separates the video signal and the backlight control data; a display control unit that controls each pixel of the display unit based on the video signal; A backlight control unit that controls the backlight based on backlight control data, and the display device controls the backlight based on the backlight control data generated by the video signal generation device. A video generation system to be controlled.

It is a figure which shows the structural example of a video generation system. It is a figure which shows arrangement | positioning of the pixel which comprises a display apparatus, and arrangement | positioning of the backlight corresponding to it. It is a figure which shows the structural example of the SDI processing part in a video signal generation apparatus. It is a figure which shows a part of data structure of an SDI signal. It is a figure explaining the example of arrangement | positioning of backlight control data. It is a figure which shows the structural example of the SDI processing part in a display apparatus.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is a diagram illustrating a configuration example of a video generation system according to the present embodiment. As shown in FIG. 1, the video generation system of the present embodiment has a configuration in which a video signal generation device 1 and a display device 2 are connected by a signal transmission means 3. The video generation system of this embodiment can be incorporated into, for example, a business camera. When the video generation system is incorporated into a commercial camera, the video signal generation device is an imaging device, the display device is a VF (viewfinder), and the signal transmission means is a coaxial cable that transmits an SDI (serial digital interface) signal. Can be configured.

  The video signal generation device 1 is a device that generates a video signal by various means such as imaging, drawing, and editing, converts the generated video signal into an SDI signal, and outputs the SDI signal. FIG. 1 illustrates an example in which the video signal generation device 1 processes a video acquired by imaging to generate a video signal. The video signal generation device 1 includes an imaging unit 11 and a video processing unit. 12, a backlight control data generation unit 13, and an SDI processing unit 14.

  The imaging unit 11 acquires a video by imaging a subject, and outputs the acquired video to the video processing unit 12.

  The video processing unit 12 processes the video acquired by the imaging unit 11 to generate a video signal, and outputs the generated video signal to the backlight control data generation unit 13 and the SDI processing unit 14.

  The backlight control data generation unit 13 generates local deming data for local deming (also simply referred to as backlight control data) from the video signal generated by the video processing unit 12.

  Here, local deming data (backlight control data) for local demming will be described.

  FIG. 2 is a diagram showing the arrangement of pixels constituting the display device and the arrangement of backlights corresponding thereto. In a display device having a backlight such as an LCD, as shown in FIG. 2, in addition to a method of controlling the brightness of each pixel by controlling the aperture ratio (backlight transmittance) of each pixel of the display device. In addition, it is possible to use a technique called local demming that performs backlight emission control in units of several horizontal and vertical pixels. It is known that a video image can be displayed partially brighter or darker by a technique called local dimming, so that a video signal can be dynamically expressed with an emphasis. The backlight control data for local dimming data is data for performing this backlight emission control. The backlight emission control in the local dimming may be on / off control of the backlight, but is not limited to the on / off control but includes control of the emission intensity of the backlight.

  For example, in the case of HDTV, the backlight control data includes video pixels having 1920 horizontal pixels and 1080 vertical pixels in one frame. Therefore, when the backlight is controlled in units of 8 × 8 pixels, Data for controlling (1920/8) × (1080/8) = 240 (horizontal) × 135 (vertical) = 32400 backlights is required as deming data.

  The backlight control data generation unit 13 generates local deming data (backlight control data) according to the brightness of each pixel constituting the video signal.

  The SDI processing unit 14 multiplexes data on the SDI standard such as a video signal, backlight control data, and a synchronization signal.

  FIG. 3 is a diagram illustrating a configuration example of the SDI processing unit 14. As shown in FIG. 3, the SDI processing unit 14 multiplexes a video signal, backlight control data, and data on the SDI standard such as a synchronization signal, and synchronization among the data on the SDI standard. A synchronization detection unit 142 that operates the horizontal / vertical counter 143 using a signal as a trigger, and a horizontal / vertical counter that is controlled by the synchronization detection unit 142 and counts the video signal, the horizontal position and the vertical position, and outputs a switching signal to the multiplexing unit 141. 143.

  Here, the multiplexing in the multiplexing unit 141 will be described. The multiplexed data output from the multiplexing unit 141 is output in the data structure of the SDI signal. The data structure of the SDI signal is determined according to the SDI standard.

  FIG. 4 shows a part of the data structure of the SDI signal. As shown in FIG. 4, the SDI signal has a Y data series and a Cb / Cr data series, and for each of these data series, a digital effective line as an effective video area and a digital line blanking as a blanking area. A digital line (horizontal period) composed of a (horizontal blanking) period is set. In a digital line (horizontal period), a video signal of one line (one horizontal period) constituting a video and a control signal corresponding to the video signal are arranged, and a video of one frame includes a plurality of digital lines. It can be configured using signals. The digital line blanking period is composed of an EAV (End of Active Video) period, a line number data period, an error detection code data period, an auxiliary data / undefined word data period, and a SAV (Start of Active Video) period. ing. In the digital line blanking period, the data usage is determined except for the auxiliary data / undefined word data period.

  The SDI processing unit 14 of this embodiment inserts backlight control data in this auxiliary data / undefined word data period. In this auxiliary data / undefined word data period, there is an empty area of 268 words, but the horizontal portion of the backlight control data when the backlight control is performed in units of 8 × 8 pixels in the HDTV calculated above is 240. Therefore, the backlight control data exemplified above can be sufficiently arranged. Actually, since there are two series of Y data series and Cb / Cr data series, the number of stored data can be further increased. In this case, it is possible to individually deal with a finer backlight arrangement.

  Since one word of the SDI signal is 10 bits, the bit width of the backlight control data can be increased to 20 bits using two series of Y data series and Cb / Cr data series. Furthermore, two of the plurality of backlight control data having a 10-bit width can be simultaneously provided for the same backlight position.

  FIG. 5 is a diagram for explaining an arrangement example of backlight control data. As shown in FIG. 5, the backlight control data can be two 10-bit width data arranged in a Y data series and a Cb / Cr data series for one backlight, and the order of arrangement of the backlights. The control data can be sequentially arranged in the horizontal direction.

  It should be noted that the SDI signal has a prohibited word for the signal. For example, when the prohibited words are 0 to 3 and 1020 to 1023, and one word of the backlight control data is the same 10-bit width data as the data transmission unit of the SDI signal, it is generated by the backlight control data generation unit 13 The backlight control data 0 to 1015 may be transmitted after being converted into data of 4 to 1019 with an offset for the prohibited word. You can restore the original data by subtracting the offset on the receiving side. If the scaling of the control data is 0 to 1000 and 100%, it is possible to perform 0 to 100% control.

  As described above, the SDI processing unit 14 outputs the multiplexed data obtained by multiplexing the data in the SDI standard such as the video signal, the backlight control data, and the synchronization signal to the signal transmission unit 3.

  The display device 2 is a device that performs display using a backlight such as an LCD, and can control brightness by controlling a backlight that is different from pixels, and can perform more dynamic display. It is.

  The display device 2 is a device that receives the multiplexed data output from the SDI processing unit 14 via the signal transmission means 3 and displays a video based on the received multiplexed data. As shown in FIG. A processing unit 21, a video processing unit 22, a backlight control unit 23, a display unit 24, and a backlight 25 are provided.

  The SDI processing unit 21 separates the video signal, the backlight control data, and the SDI standard such as the synchronization signal from the received multiplexed data. FIG. 6 is a diagram illustrating a configuration example of the SDI processing unit 21. As shown in FIG. 6, a separation unit 211, a synchronization detection unit 212, and a horizontal / vertical counter 213 are included. In the SDI processing unit 21, a synchronization signal is detected by the synchronization detection unit 212, a horizontal / vertical counter is operated using the detected synchronization signal as a trigger, and a horizontal position and a vertical position are counted by the horizontal / vertical counter 213 to separate switching signals. When output to the unit 211, the separation unit 211 sequentially separates the data on the SDI signal such as the synchronization of the video signal and the backlight control data from the multiplexed data (data arranged in accordance with the SDI signal standard).

  The SDI processing unit 21 outputs the video signal and additional data such as a synchronization signal among the separated data to the video processing unit 22, and outputs the backlight control data and the synchronization signal to the backlight control unit 23. .

  The video processing unit 22 performs video processing on the received video signal based on additional data such as a synchronization signal, and controls each pixel of the display unit 24 to perform video display.

  The backlight control unit 23 controls the backlight in synchronization with the video displayed on the display unit 24 using the received backlight control data and the synchronization signal.

  As described above, in the video generation system according to the present embodiment, the display device 2 simply separates the backlight control data from the SDI signal in the same manner as the video signal, and turns on the backlight based on the separated backlight control data. By controlling, local deming control is possible. Therefore, it is not necessary to provide a complicated circuit for generating backlight control data on the display device 2 side.

  The signal transmission means 3 can be configured by a coaxial cable or the like that can transmit an SDI signal. In the video generation system of this embodiment, the signal transmission means is not limited as long as video data and backlight control data can be transmitted between the video signal generation device 1 and the display device 2 in the form of an SDI signal.

  According to the video generation system of the present embodiment, the backlight control data is arranged in the auxiliary data / undefined word data period of the digital line blanking period in the SDI signal that is the data transmission form of the video signal, thereby allowing the existing SDI With the signal, a dynamic video can be displayed by local deming control in the liquid crystal display device without having to generate a backlight control signal on the receiving side.

  In the above embodiment, the display device 2 on the receiving side has been described by taking as an example a configuration that does not generate backlight control data at all. However, the display device 2 on the receiving side generates backlight control data. It is not excluded to provide a configuration for performing the above.

DESCRIPTION OF SYMBOLS 1 Video signal generation apparatus 11 Imaging part 12 Video processing part 13 Backlight control data generation part 14 SDI processing part 141 Multiplexing part 142 Synchronization detection part 143 Horizontal / vertical counter 2 Display device 21 SDI processing part 211 Separation part 212 Synchronization detection part 213 Horizontal / vertical counter 22 Video processing unit 23 Backlight control unit 24 Display unit 25 Backlight 3 Signal transmission means

Claims (5)

A video signal generator for generating a video signal;
A backlight control data generation unit for generating backlight control data from the generated video signal;
An SDI signal generation unit that arranges the generated video signal in an effective video area, converts the generated backlight control data into an SDI signal arranged in a blanking area, and outputs the SDI signal; A video signal generating device. A display device comprising a display unit comprising a plurality of pixels and a backlight provided corresponding to one or more pixels of the display unit,
An SDI separation unit for separating the video signal and the backlight control data from the SDI signal in which the video signal is arranged in the effective video region and the backlight control data is arranged in the blanking region;
A display control unit for controlling each pixel of the display unit based on the separated video signal;
A display device further comprising: a backlight control unit that controls the backlight based on the separated backlight control data. A video signal generator for generating a video signal;
A backlight control data generation unit for generating backlight control data from the generated video signal;
A video signal generating device having an SDI signal generating unit that arranges the generated video signal in an effective video region, converts the generated backlight control data into an SDI signal arranged in a blanking region, and outputs the SDI signal;
A display device having a display unit composed of a plurality of pixels and a backlight provided corresponding to one or more pixels of the display unit,
An SDI separation unit for separating the video signal and the backlight control data from the SDI signal in which the video signal is arranged in the effective video region and the backlight control data is arranged in the blanking region;
A display control unit that controls each pixel of the display unit based on the video signal;
The display device having a backlight control unit for controlling the backlight based on the backlight control data,
The video display system, wherein the display device controls the backlight based on backlight control data generated by the video signal generator.   4. The video generation system according to claim 3, wherein the video signal generation device and the display device are signal-connected by a coaxial cable.   5. The video generation system according to claim 3, wherein the display device is a viewfinder.

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