Image display device and video wall having same

Abstract

The present disclosure relates to an image display device and a video wall having same. The image display device according to an embodiment of the present disclosure comprises: a panel having a plurality of light-emitting diodes; and a driving control unit for outputting scan signals to the plurality of light-emitting diodes during each sub-frame period, wherein the driving control unit includes a buffer for storing frame data, and if the driving control unit is in a first mode in which a frame rate or a vertical synchronization signal varies and if the frequency of the varying vertical synchronization signal is less than a reference frequency, the driving control unit repeats the frame data stored in the buffer and controls such that only a part of the sub-frame data in the repeated frame data is output and the other part is not output. Accordingly, flickering can be reduced when the frame rate or the vertical synchronization signal varies.

Description

Video display device and video wall equipped with the same

[0001] The present disclosure relates to a video display device and a video wall having the same, and more particularly, to a video display device capable of reducing flicker when a frame rate or vertical synchronization signal is varied, and a video wall having the same.

[0002] A video display device is a device that has a display and displays images.

[0003] Meanwhile, various types of displays are used in video display devices, such as liquid crystal display panels and light-emitting diode panels.

[0004] Meanwhile, in the case of configuring a video display device based on a light-emitting diode panel, an active matrix driving method or a passive matrix driving method is used to drive the light-emitting diode panel.

[0005] When driving a display device based on a light-emitting diode panel based on a passive matrix driving method, a plurality of sub-frames are used to cause the light-emitting diode to emit light or not emit light.

[0006] However, if there is a significant non-luminous period among multiple sub-frames, a flicker phenomenon occurs during image output.

[0007] In particular, when the frame rate is variable, there is a disadvantage in that the flicker phenomenon becomes more severe because some sub-frame periods within the frame period are not illuminated.

[0008] The problem of the present disclosure is to provide a video display device capable of reducing flicker when a frame rate or vertical synchronization signal is variable, and a video wall having the same.

[0009] Another object of the present disclosure is to provide a video display device capable of easily reducing flicker even when the video output mode changes, and a video wall having the same.

[0010] Another object of the present disclosure is to provide a video display device capable of reducing flicker when a frame rate or a vertical synchronization signal is varied as an output of a data signal corresponding to a light-emitting diode, and a video wall having the same.

[0011] According to one embodiment of the present disclosure for achieving the above-described problem, a display device includes a panel having a plurality of light-emitting diodes, and a driving control unit for outputting a scan signal to the plurality of light-emitting diodes for each of a plurality of sub-frame periods, wherein the driving control unit includes a buffer for storing frame data, and wherein the driving control unit is in a first mode in which a frame rate or a vertical synchronization signal is variable, and when the frequency of the variable vertical synchronization signal is lower than a reference frequency, the frame data stored in the buffer is repeated, and only a part of the sub-frame data within the repeated frame data is output, and the other part is controlled not to be output.

[0012] Meanwhile, the driving control unit can control the frame rate or vertical synchronization signal to be in a first mode in which the frame rate or vertical synchronization signal is variable, and to output only a portion of the sub-frame data within the frame data and not output the other portion when the frequency of the variable vertical synchronization signal exceeds the reference frequency.

[0013] Meanwhile, the driving control unit can control to output all sub-frame data within the frame data in the first mode in which the frame rate or vertical synchronization signal is variable, and the frequency of the variable vertical synchronization signal is a reference frequency.

[0014] Meanwhile, the driving control unit is a first mode in which the frame rate or vertical synchronization signal is variable, and when the frequency of the variable vertical synchronization signal is less than a reference frequency, a first number of sub-frame periods can be set, and when the frequency exceeds the reference frequency, a second number of sub-frame periods smaller than the first number can be set.

[0015] Meanwhile, the driving control unit is a first mode in which the frame rate or vertical synchronization signal is variable, and can set the sub-frame period when the frequency of the variable vertical synchronization signal is less than the reference frequency to be the same as the sub-frame period when the frequency exceeds the reference frequency.

[0016] Meanwhile, the drive control unit can control to output all sub-frame data within the frame data when the frame rate or vertical synchronization signal is in a constant second mode.

[0017] Meanwhile, the driving control unit can control, in the case of the first mode in which the frame rate or vertical synchronization signal is variable, so that a non-light-emitting period does not occur during a plurality of sub-frame periods during a period between vertical synchronization signals.

[0018] Meanwhile, the driving control unit can control the interval between multiple sub-frame periods to be constant during the period between vertical synchronization signals in the first mode in which the frame rate or vertical synchronization signal is variable.

[0019] Meanwhile, the driving control unit can control the scan cycle of the scan signal to be constant during the period between vertical synchronization signals in the first mode in which the frame rate or vertical synchronization signal is variable.

[0020] Meanwhile, the driving control unit can control the non-lighting period to not occur during a plurality of sub-frame periods during a period between vertical synchronization signals when the frame rate or vertical synchronization signal is varied from the first level to the second level.

[0021] Meanwhile, the driving control unit can control the interval between the plurality of sub-frame periods to be constant during the period between the vertical synchronization signals when the frame rate or the vertical synchronization signal is varied from the first level to the second level.

[0022] Meanwhile, the driving control unit can control the scan cycle of the scan signal to be constant during the period between the vertical synchronization signals when the frame rate or the vertical synchronization signal is varied from the first level to the second level.

[0023] Meanwhile, in the first mode, the driving control unit can control the number of sub-frames within a frame to vary in response to the frequency of the variable vertical synchronization signal, but can control the interval between the multiple sub-frame periods to be constant.

[0024] Meanwhile, the plurality of light-emitting diodes include a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode, and the driving control unit can control the level of the data signal supplied to the red light-emitting diode to be lower than the level of the data signal supplied to the green light-emitting diode or the blue light-emitting diode.

[0025] Meanwhile, an image display device according to one embodiment of the present disclosure may further include a signal processing device that outputs an image signal to the display.

[0026] Meanwhile, a video display device according to another embodiment of the present disclosure includes a panel having a plurality of light-emitting diodes, and a driving control unit that outputs a scan signal to the plurality of light-emitting diodes for each of a plurality of sub-frame periods, wherein, when the video output mode is a game mode or a variable scan rate mode, the driving control unit controls the number of sub-frames within a frame to vary in response to a variable frequency of a vertical synchronization signal, while controlling the intervals between the plurality of sub-frame periods to be constant.

[0027] Meanwhile, the driving control unit can control to perform frame repeating and sub-frame cutting when the video output mode is a game mode or a variable refresh rate mode and the frequency of the variable vertical synchronization signal is lower than the reference frequency.

[0028] Meanwhile, the driving control unit can control to perform sub-frame cutting when the video output mode is a game mode or a variable refresh rate mode and the frequency of the variable vertical synchronization signal exceeds the reference frequency.

[0029] Meanwhile, when the image output mode is normal mode, the driving control unit can output a scan signal and a data signal respectively in response to a certain number of sub-frames within a frame based on a certain frequency of a vertical synchronization signal.

[0030] Meanwhile, a video wall according to one embodiment of the present disclosure includes a plurality of image display devices, the image display devices including a panel having a plurality of light-emitting diodes, and a driving control unit that outputs a scan signal to the plurality of light-emitting diodes for each of a plurality of sub-frame periods, the driving control unit including a buffer that stores frame data, and the driving control unit controls the frame data stored in the buffer to be repeated when the frame rate or the vertical synchronization signal is in a first mode in which the frame rate or the vertical synchronization signal is variable and the frequency of the variable vertical synchronization signal is lower than a reference frequency, and only a part of the sub-frame data within the repeated frame data is output, and the other part is not output.

[0031] Meanwhile, a video wall according to another embodiment of the present disclosure includes a plurality of image display devices, the image display devices including a panel having a plurality of light-emitting diodes, and a driving control unit that outputs a scan signal to the plurality of light-emitting diodes for each of a plurality of sub-frame periods, and the driving control unit controls the number of sub-frames within a frame to be varied in response to a variable frequency of a vertical synchronization signal when the image output mode is a game mode or a variable scan rate mode, while controlling the intervals between the plurality of sub-frame periods to be constant.

[0032] According to one embodiment of the present disclosure, a video display device includes a panel having a plurality of light-emitting diodes, and a driving control unit that outputs a scan signal to the plurality of light-emitting diodes for each of a plurality of sub-frame periods, wherein the driving control unit includes a buffer that stores frame data, and wherein the driving control unit is in a first mode in which a frame rate or a vertical synchronization signal is variable, and when the frequency of the variable vertical synchronization signal is lower than a reference frequency, the frame data stored in the buffer is repeated, and only a part of sub-frame data within the repeated frame data is output, and the other part is controlled not to be output. Accordingly, flicker can be reduced when the frame rate or the vertical synchronization signal is variable.

[0033] Meanwhile, the driving control unit can control the output of only a portion of sub-frame data within the frame data and not the other portion when the first mode is one in which the frame rate or vertical synchronization signal is variable, and the frequency of the variable vertical synchronization signal exceeds the reference frequency. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0034] Meanwhile, the drive control unit can control to output all sub-frame data within the frame data in the first mode in which the frame rate or vertical synchronization signal is variable, and the frequency of the variable vertical synchronization signal is the reference frequency. Accordingly, it is possible to output image data stably.

[0035] Meanwhile, the driving control unit is configured to set a first number of sub-frame periods when the frequency of the variable vertical synchronization signal is less than a reference frequency in a first mode in which the frame rate or vertical synchronization signal is variable, and to set a second number of sub-frame periods smaller than the first number when the frequency of the variable vertical synchronization signal is greater than the reference frequency. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0036] Meanwhile, the driving control unit can be configured to have a first mode in which the frame rate or vertical synchronization signal is variable, and the sub-frame period when the frequency of the variable vertical synchronization signal is less than the reference frequency can be set to be the same as the sub-frame period when the frequency exceeds the reference frequency. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0037] Meanwhile, the drive control unit can control to output all sub-frame data within the frame data when the frame rate or vertical synchronization signal is in a constant second mode. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0038] Meanwhile, the driving control unit can control, in the case of the first mode in which the frame rate or vertical synchronization signal is variable, to prevent a non-luminous period from occurring during a plurality of sub-frame periods during the period between vertical synchronization signals. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0039] Meanwhile, the driving control unit can control the interval between multiple sub-frame periods to be constant during the period between vertical synchronization signals in the first mode in which the frame rate or vertical synchronization signal is variable. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0040] Meanwhile, the driving control unit can control the scan cycle of the scan signal to be constant during the period between vertical synchronization signals in the first mode in which the frame rate or vertical synchronization signal is variable. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0041] Meanwhile, the driving control unit can control the non-emission period to not occur during a plurality of sub-frame periods during the period between the vertical synchronization signals when the frame rate or vertical synchronization signal varies from the first level to the second level. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal varies.

[0042] Meanwhile, the driving control unit can control the interval between multiple sub-frame periods to be constant during the period between vertical synchronization signals when the frame rate or vertical synchronization signal varies from the first level to the second level. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal varies.

[0043] Meanwhile, the driving control unit can control the scan cycle of the scan signal to be constant during the period between the vertical synchronization signals when the frame rate or the vertical synchronization signal varies from the first level to the second level. Accordingly, flicker can be reduced when the frame rate or the vertical synchronization signal varies.

[0044] Meanwhile, in the first mode, the driving control unit can control the number of sub-frames within a frame to vary in response to the variable frequency of the vertical synchronization signal, while controlling the interval between the multiple sub-frame periods to be constant. Accordingly, flicker can be reduced when the frame rate or the vertical synchronization signal varies.

[0045] Meanwhile, the plurality of light-emitting diodes include a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode, and the driving control unit can control the level of the data signal supplied to the red light-emitting diode to be lower than the level of the data signal supplied to the green light-emitting diode or the blue light-emitting diode. Accordingly, it is possible to output a data signal corresponding to the light-emitting diode.

[0046] Meanwhile, an image display device according to one embodiment of the present disclosure may further include a signal processing device that outputs an image signal to the display. Accordingly, a signal-processed image can be displayed.

[0047] Meanwhile, a video display device according to another embodiment of the present disclosure includes a panel having a plurality of light-emitting diodes, and a driving control unit that outputs a scan signal to the plurality of light-emitting diodes for each of a plurality of sub-frame periods, wherein, when the video output mode is a game mode or a variable refresh rate mode, the driving control unit controls the number of sub-frames within a frame to vary in response to the frequency of a variable vertical synchronization signal, while controlling the interval between the plurality of sub-frame periods to be constant. Accordingly, flicker can be reduced when the frame rate or the vertical synchronization signal varies.

[0048] Meanwhile, the drive control unit can control frame repeating and sub-frame cutting to be performed when the video output mode is a game mode or a variable refresh rate mode and the frequency of the variable vertical synchronization signal is lower than the reference frequency. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0049] Meanwhile, the drive control unit can control to perform sub-frame cutting when the video output mode is a game mode or a variable refresh rate mode and the frequency of the variable vertical synchronization signal exceeds the reference frequency. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0050] Meanwhile, when the image output mode is normal mode, the drive control unit can output scan signals and data signals respectively in response to a certain number of sub-frames within a frame based on the frequency of a certain vertical synchronization signal. Accordingly, flicker can be easily reduced even when the image output mode changes.

[0051] Meanwhile, a video wall according to one embodiment of the present disclosure includes a plurality of image display devices, wherein the image display devices include a panel having a plurality of light-emitting diodes, and a driving control unit that outputs a scan signal to the plurality of light-emitting diodes for each of a plurality of sub-frame periods, wherein the driving control unit includes a buffer that stores frame data, and wherein the driving control unit is in a first mode in which a frame rate or a vertical synchronization signal is variable, and when the frequency of the variable vertical synchronization signal is lower than a reference frequency, the frame data stored in the buffer is repeated, and only a part of the sub-frame data within the repeated frame data is output, and the other part is controlled not to be output. Accordingly, flicker can be reduced when the frame rate or the vertical synchronization signal is variable.

[0052] Meanwhile, a video wall according to another embodiment of the present disclosure includes a plurality of image display devices, the image display devices including a panel having a plurality of light-emitting diodes, and a driving control unit that outputs a scan signal to the plurality of light-emitting diodes for each of a plurality of sub-frame periods, and the driving control unit controls the number of sub-frames within a frame to vary in response to the frequency of a variable vertical synchronization signal when the image output mode is a game mode or a variable refresh rate mode, while controlling the interval between the plurality of sub-frame periods to be constant. Accordingly, flicker can be reduced when the frame rate or the vertical synchronization signal varies.

[0053] FIG. 1 is a diagram illustrating a video wall according to one embodiment of the present disclosure.

[0054] Figure 2 is an example of an internal block diagram of the video wall of Figure 1.

[0055] Fig. 3 is an example of an internal block diagram of the signal processing device of Fig. 2.

[0056] Figure 4 is an internal block diagram of the display of Figure 2.

[0057] FIGS. 5A to 5C are drawings for reference in the description of the light-emitting panel of FIG. 4.

[0058] Fig. 6 is a drawing illustrating an example of the light-emitting panel of Fig. 4.

[0059] FIGS. 7A to 8D are drawings for reference in explaining the operation of a video display device related to the present disclosure.

[0060] FIG. 9a is a flowchart showing an operation method of an image display device according to one embodiment of the present disclosure.

[0061] FIG. 9b is a flowchart showing an operation method of an image display device according to another embodiment of the present disclosure.

[0062] Figures 10a to 10e are drawings referenced in the description of Figure 9a or Figure 9b.

[0063] Hereinafter, the present disclosure will be described in more detail with reference to the drawings.

[0064] The suffixes "module" and "part" used in the following description are given solely for the convenience of writing this specification and do not impart any particularly significant meaning or role to the components themselves. Therefore, the terms "module" and "part" may be used interchangeably.

[0065] FIG. 1 is a diagram illustrating a video wall according to one embodiment of the present disclosure.

[0066] Referring to the drawing, a video wall (10) according to one embodiment of the present disclosure may include a plurality of image display devices (100a to 100d).

[0067] A video wall (10) according to one embodiment of the present disclosure can receive images from a set-top box (not shown), a server (not shown), or an internal memory.

[0068] For example, the video wall (10) can receive a video signal from a set-top box (not shown) through an HDMI terminal.

[0069] As another example, the video wall (10) can receive a video signal from a server (not shown) through a network terminal.

[0070] Meanwhile, the video wall (10) can be installed inside or outside the building.

[0071] For example, a video wall (10) can be installed in public facilities such as vehicles, terminals, train stations, and airports to provide information such as advertisements, news, and notices. Furthermore, it can be placed around show windows in stores such as department stores, shopping malls, and large marts to advertise specific products.

[0072] As another example, the video wall (10) can be installed and placed on a wall inside a house.

[0073] Such a video wall (10) may be equipped with a plurality of displays (180a to 180d) arranged adjacently.

[0074] Meanwhile, the plurality of displays (180a to 180d) may be implemented using any one of various panels. For example, the plurality of displays (180a to 180d) may be any one of a liquid crystal display panel (LCD panel), an organic light-emitting diode (OLED) panel, an inorganic light-emitting panel (LED panel), etc.

[0075] In this disclosure, a plurality of displays (180a to 180d) are described with a focus on having inorganic light-emitting panels (LED panels).

[0076] Meanwhile, the inorganic light-emitting panel (LED panel) contains light-emitting diodes and has the advantages of excellent response speed and color reproduction.

[0077] Meanwhile, a plurality of displays (180a to 180d) may be provided with a plurality of panels (210a to 210d) and bezels (Ba to Bd) surrounding the panels (210a to 210d).

[0078] In the drawing, the video wall (10) is exemplified as having a plurality of video display devices (100a to 100d) each having a display (180a to 180d).

[0079] Alternatively, for displaying images on a video wall (10), a signal processing device (170 to 170d) provided in each of a plurality of image display devices (100a to 100d) may be used.

[0080] For example, an image distributed from a signal processing device (170) is input to a signal processing device (170 to 170d) provided in each of a plurality of image display devices (100a to 100d), and an image signal processed in each of the signal processing devices (170 to 170d) is input to each display (180a to 180d), and each display (180a to 180d) can display the corresponding image.

[0081] Accordingly, the viewer (50) can view the image displayed on the video wall (10), as shown in the drawing. In particular, the viewer can view the image displayed on multiple displays (180a to 180d).

[0082] As another example, the video wall (10) may include a single signal processing device that commonly controls multiple image display devices (100a to 100d). Accordingly, the common signal processing device can perform signal processing on the displayed image. Then, the image signal-processed image is input to each display (180a to 180d), and each display (180a to 180d) can display the corresponding image.

[0083] Meanwhile, a plurality of displays (180a to 180d) have inorganic light-emitting panels including light-emitting diodes, and use a plurality of sub-frames based on a passive matrix method. When the light-emitting diodes emit light or do not emit light, a flicker phenomenon may occur during image output.

[0084] In particular, flickering may become more severe when there are significant non-emitting periods among multiple sub-frames. Furthermore, when the frame rate is variable, flickering may become more severe as some sub-frame periods within a frame period are non-emitting.

[0085] Accordingly, the present disclosure adopts a method of outputting only a portion of sub-frame data within frame data, while omitting the remaining portion. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal varies. This will be described in detail with reference to FIG. 9a and below.

[0086] Figure 2 is an example of an internal block diagram of the video wall of Figure 1.

[0087] Referring to the drawing, the video wall (10) may be equipped with first to fourth video display devices (100a to 100d).

[0088] In the drawing, for convenience, the second to fourth image display devices (100b to 100d) are illustrated as having second to fourth displays (180b to 180d) and second to fourth signal processing devices (170b to 170d), respectively; however, alternatively, they may be provided with an external device interface unit, a network interface unit, a memory, an image distribution unit, a power supply unit, an audio output unit, etc.

[0089] Meanwhile, the first image display device (100a) may be equipped with an external device interface unit (130), a network interface unit (135), a memory (140), a user input interface unit (150), a signal processing device (170), a signal processing device (170), a first display (180a), a power supply unit (190), an audio output unit (185), etc.

[0090] The external device interface unit (130) can transmit and receive data with a connected external device (not shown). To this end, the external device interface unit (130) may include an A / V input / output unit (not shown) or a data input / output unit (not shown).

[0091] For example, the external device interface unit (130) may include an HDMI terminal, an RGB terminal, a component terminal, a USB terminal, a micro SD terminal, etc.

[0092] The network interface unit (135) provides an interface for connecting the video display device (100) to a wired / wireless network, including the Internet. For example, the network interface unit (135) can transmit and receive content or data provided by the Internet, a content provider, or a network operator via a network.

[0093] The memory (140) may store a program for each signal processing and control within the signal processing device (170), and may also store a signal-processed image, voice, or data signal.

[0094] Additionally, the memory (140) may also perform a function for temporary storage of image, voice, or data signals input to the external device interface unit (130).

[0095] Meanwhile, multiple displays (180a to 180d) can be arranged adjacent to each other and can be equipped with various display panels such as LCD, OLED, PDP, etc., and can display a predetermined image through the display panels.

[0096] The user input interface unit (150) transmits a signal input by the user to the signal processing device (170) or transmits a signal from the signal processing device (170) to the user.

[0097] To this end, the user input interface unit (150) may be equipped with a local key including a power key, a touch panel for inputting user information, etc.

[0098] The signal processing device (170) can distribute an input image stored in a memory (140), an input image received from an external device through an external device interface unit (130), or a network interface unit (135) into a plurality of images for display on a plurality of displays (180a to 180d).

[0099] For example, the signal processing device (170) can crop an input image into multiple images and perform scaling.

[0100] In particular, the signal processing device (170) can perform cropping, scaling, etc., taking into account the resolution, size, etc. of the plurality of displays (180a to 180d).

[0101] Meanwhile, the signal processing device (170) may perform overall control operations of the video wall (10). Specifically, it may control the operations of each unit within the video wall (10).

[0102] Meanwhile, the signal processing device (170) can distribute the image and transmit the distributed image to a plurality of signal processing devices (170 to 170d).

[0103] Meanwhile, at least one signal processing device may be provided to control multiple displays (180a to 180d).

[0104] Meanwhile, in the drawing, a plurality of signal processing devices (170 to 170d) corresponding to the number of the plurality of displays (180a to 180d) are illustrated to control the plurality of displays (180a to 180d).

[0105] A plurality of signal processing devices (170 to 170d) can perform control operations for displaying images on a plurality of displays (180a to 180d).

[0106] A plurality of signal processing devices (170 to 170d) can perform signal processing on an input image and transmit the processed image signal to a plurality of displays (180a to 180d).

[0107] That is, each of the plurality of signal processing devices (170 to 170d) can control the plurality of displays (180a to 180d) to output a predetermined image. Specifically, R, G, and B signals corresponding to the video image to be displayed can be output to the plurality of displays (180a to 180d). Accordingly, the plurality of displays (180a to 180d) can display each image.

[0108] The power supply unit (190) can supply power required for the operation of each component by receiving external power or internal power.

[0109] The power supply unit (190) supplies power to the entire image display device (100). In particular, it can supply power to a plurality of signal processing devices (170 to 170d) that can be implemented in the form of a system on chip (SOC), a plurality of displays (180a to 180d) for image display, and an audio output unit (185) for audio output.

[0110] The temperature sensing unit (not shown) can sense the temperature of the video wall (10).

[0111] The temperature detected by the temperature detection unit (not shown) can be input to at least one of the plurality of signal processing devices (170 to 170d), and at least one of the plurality of signal processing devices (170 to 170d) can control the operation of the fan driving unit (not shown) to reduce internal heat based on the detected temperature.

[0112] Meanwhile, an image display device (100A) according to an embodiment of the present disclosure may include an image receiving unit (105), a memory (140), a user input interface unit (150), a sensor unit (not shown), a signal processing unit (170), a display (180), and an audio output unit (185).

[0113] The video receiving unit (105) may include a tuner unit (110), a demodulation unit (120), a network interface unit (130), and an external device interface unit (130).

[0114] Meanwhile, unlike the drawing, the video receiving unit (105) may include only a tuner unit (110), a demodulator unit (120), and an external device interface unit (130). That is, it may not include a network interface unit (130).

[0115] The tuner unit (110) selects an RF broadcast signal corresponding to a channel selected by the user or all pre-stored channels among RF (Radio Frequency) broadcast signals received through an antenna (not shown). In addition, it converts the selected RF broadcast signal into an intermediate frequency signal or a baseband video or audio signal.

[0116] For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted into a digital IF signal (DIF), and if it is an analog broadcast signal, it is converted into an analog baseband video or audio signal (CVBS / SIF). That is, the tuner unit (110) can process a digital broadcast signal or an analog broadcast signal. The analog baseband video or audio signal (CVBS / SIF) output from the tuner unit (110) can be directly input to the signal processing device (170).

[0117] Meanwhile, the tuner unit (110) may be equipped with multiple tuners to receive broadcast signals of multiple channels. Alternatively, a single tuner that simultaneously receives broadcast signals of multiple channels is also possible.

[0118] The demodulation unit (120) receives the digital IF signal (DIF) converted from the tuner unit (110) and performs a demodulation operation.

[0119] The demodulator (120) can output a stream signal (TS) after performing demodulation and channel decoding. At this time, the stream signal may be a signal in which a video signal, an audio signal, or a data signal is multiplexed.

[0120] The stream signal output from the demodulator (120) can be input to the signal processing device (170). The signal processing device (170) performs demultiplexing, image / audio signal processing, etc., and then outputs an image to the display (180) and outputs an audio to the audio output device (185).

[0121] The external device interface unit (130) can transmit or receive data to or from a connected external device (not shown), for example, a set-top box (50). To this end, the external device interface unit (130) may include an A / V input / output unit (not shown).

[0122] The external device interface unit (130) can be connected to external devices such as a DVD (Digital Versatile Disk), Blu-ray, game device, camera, camcorder, computer (laptop), set-top box, etc., via wired / wireless connection, and can also perform input / output operations with the external devices.

[0123] The A / V input / output unit can receive video and audio signals from an external device. Meanwhile, the wireless communication unit (not shown) can perform short-range wireless communication with other electronic devices.

[0124] Through this wireless communication unit (not shown), the external device interface unit (130) can exchange data with an adjacent mobile terminal (600). In particular, the external device interface unit (130) can receive device information, running application information, application images, etc. from the mobile terminal (600) in mirroring mode.

[0125] The network interface unit (135) provides an interface for connecting the video display device (100) to a wired / wireless network, including the Internet. For example, the network interface unit (135) can receive content or data provided by the Internet, a content provider, or a network operator via a network.

[0126] Meanwhile, the network interface unit (135) may include a wireless communication unit (not shown).

[0127] The memory (140) may store a program for each signal processing and control within the signal processing device (170), and may also store a signal-processed image, voice, or data signal.

[0128] In addition, the memory (140) may also perform a function for temporary storage of video, audio, or data signals input to the external device interface unit (130). In addition, the memory (140) may store information about a specific broadcast channel through a channel memory function such as a channel map.

[0129] Although the memory (140) of FIG. 2 illustrates an embodiment in which the memory (140) is provided separately from the signal processing device (170), the scope of the present disclosure is not limited thereto. The memory (140) may be included within the signal processing device (170).

[0130] The user input interface unit (150) transmits a signal input by the user to the signal processing device (170) or transmits a signal from the signal processing device (170) to the user.

[0131] For example, a user input signal such as power on / off, channel selection, screen setting, etc. may be transmitted / received from a remote control device (200), a user input signal input from a local key (not shown) such as a power key, a channel key, a volume key, a setting value, etc. may be transmitted to a signal processing device (170), a user input signal input from a sensor unit (not shown) that senses a user's gesture may be transmitted to the signal processing device (170), or a signal from the signal processing device (170) may be transmitted to a sensor unit (not shown).

[0132] The signal processing device (170) can demultiplex an input stream or process demultiplexed signals through a tuner unit (110), a demodulator unit (120), a network interface unit (135), or an external device interface unit (130) to generate and output a signal for video or audio output.

[0133] For example, the signal processing device (170) can receive a broadcast signal or an HDMI signal received from the image receiving unit (105), perform signal processing based on the received broadcast signal or HDMI signal, and output a signal-processed image signal.

[0134] An image signal processed by a signal processing device (170) may be input to a display (180) and displayed as an image corresponding to the image signal. In addition, an image signal processed by a signal processing device (170) may be input to an external output device through an external device interface unit (130).

[0135] The voice signal processed in the signal processing device (170) can be output as sound to the audio output unit (185). In addition, the voice signal processed in the signal processing device (170) can be input to an external output device through the external device interface unit (130).

[0136] Although not illustrated in FIG. 2, the signal processing device (170) may include a demultiplexing unit, an image processing unit, etc. That is, the signal processing device (170) may perform various signal processing operations and, accordingly, may be implemented in the form of a system on chip (SOC). This will be described later with reference to FIG. 3.

[0137] In addition, the signal processing device (170) can control the overall operation within the video display device (100). For example, the signal processing device (170) can control the tuner unit (110) to select (tune) an RF broadcast corresponding to a channel selected by a user or a pre-stored channel.

[0138] In addition, the signal processing device (170) can control the image display device (100) by a user command or internal program input through the user input interface unit (150).

[0139] Meanwhile, the signal processing device (170) can control the display (180) to display an image. At this time, the image displayed on the display (180) may be a still image or a moving image, and may be a 2D image or a 3D image.

[0140] Meanwhile, the signal processing device (170) can cause a predetermined object to be displayed within an image displayed on the display (180). For example, the object can be at least one of a connected web screen (newspaper, magazine, etc.), an EPG (Electronic Program Guide), various menus, widgets, icons, still images, videos, and text.

[0141] Meanwhile, the signal processing device (170) can recognize the user's location based on an image captured from a camera (not shown). For example, the distance (z-axis coordinate) between the user and the image display device (100) can be determined. In addition, the x-axis coordinate and y-axis coordinate within the display (180) corresponding to the user's location can be determined.

[0142] The display (180) generates a driving signal by converting a video signal, data signal, OSD signal, control signal, etc. processed by the signal processing device (170) or a video signal, data signal, control signal, etc. received from the external device interface unit (130).

[0143] Meanwhile, the display (180) is configured as a touch screen and can be used as an input device in addition to an output device.

[0144] The audio output unit (185) receives a signal processed by the signal processing device (170) and outputs it as voice.

[0145] A camera unit (not shown) photographs a user. The camera unit (not shown) may be implemented with a single camera, but is not limited thereto, and may also be implemented with multiple cameras. Image information captured by the camera unit (not shown) may be input to a signal processing device (170).

[0146] The signal processing device (170) can detect the user's gesture based on an image captured from a shooting unit (not shown) or a signal detected from a sensor unit (not shown), or a combination thereof.

[0147] The power supply unit (190) supplies power to the entire image display device (100). In particular, the power supply unit (190) can supply power to a signal processing device (170) that can be implemented in the form of a system on chip (SOC), a display (180) for image display, and an audio output unit (185) for audio output.

[0148] Specifically, the power supply unit (190) may be equipped with a converter that converts AC power into DC power and a dc / dc converter that converts the level of the DC power.

[0149] The remote control device (200) transmits user input to the user input interface unit (150). To this end, the remote control device (200) may use Bluetooth, RF (Radio Frequency) communication, IR (Infrared) communication, UWB (Ultra Wideband), ZigBee, etc. In addition, the remote control device (200) may receive video, audio, or data signals output from the user input interface unit (150) and display or output the same as audio on the remote control device (200).

[0150] Meanwhile, the above-described video display device (100) may be a digital broadcast receiver capable of receiving fixed or mobile digital broadcasts.

[0151] Meanwhile, the block diagram of the image display device (100) illustrated in FIG. 3 is a block diagram for one embodiment of the present disclosure. Each component of the block diagram may be integrated, added, or omitted depending on the specifications of the image display device (100) actually implemented. That is, two or more components may be combined into one component, or one component may be subdivided into two or more components, as needed. In addition, the functions performed by each block are intended to explain the embodiment of the present disclosure, and the specific operations or devices thereof do not limit the scope of the present disclosure.

[0152] Figure 3 is an example of an internal block diagram of the signal processing device of Figure 2.

[0153] Referring to the drawings, a signal processing device (170) according to an embodiment of the present disclosure may include a demultiplexing unit (310), an image processing unit (320), a processor (330), and an audio processing unit (370). In addition, a data processing unit (not shown) may be further included.

[0154] The demultiplexer (310) demultiplexes the input stream. For example, when MPEG-2 TS is input, it can be demultiplexed to separate it into video, audio, and data signals, respectively. Here, the stream signal input to the demultiplexer (310) may be a stream signal output from the tuner (110), the demodulator (120), or the external device interface (130).

[0155] The image processing unit (320) can perform signal processing on an input image. For example, the image processing unit (320) can perform image processing on an image signal demultiplexed from the demultiplexing unit (310).

[0156] To this end, the image processing unit (320) may include an image decoder (325), a scaler (335), an image quality processing unit (635), an image encoder (not shown), an OSD processing unit (340), a frame image rate conversion unit (350), and a formatter (360).

[0157] The video decoder (325) decodes the demultiplexed video signal, and the scaler (335) scales the resolution of the decoded video signal so that it can be output on the display (180).

[0158] The video decoder (325) can be equipped with decoders of various standards. For example, it can be equipped with an MPEG-2, H.264 decoder, a 3D video decoder for color images and depth images, a decoder for multi-view images, etc.

[0159] The scaler (335) can scale an input video signal that has been decoded by a video decoder (325), etc.

[0160] For example, the scaler (335) can upscale when the size or resolution of the input image signal is small, and downscale when the size or resolution of the input image signal is large.

[0161] The image quality processing unit (635) can perform image quality processing on an input image signal for which image decoding has been completed in the image decoder (325), etc.

[0162] For example, the image quality processing unit (635) may perform noise removal processing of an input image signal, expand the resolution of the gradation of an input image signal, perform image resolution enhancement, perform signal processing based on high dynamic range (HDR), vary the frame image rate, or perform image quality processing corresponding to panel characteristics, particularly a light-emitting panel.

[0163] The OSD processing unit (340) generates an OSD signal based on user input or on its own. For example, based on a user input signal, a signal for displaying various information in the form of graphics or text on the screen of the display (180) may be generated. The generated OSD signal may include various data such as the user interface screen of the image display device (100), various menu screens, widgets, and icons. In addition, the generated OSD signal may include a 2D object or a 3D object.

[0164] In addition, the OSD processing unit (340) can generate a pointer that can be displayed on the display based on a pointing signal input from the remote control device (200). In particular, such a pointer can be generated by the pointing control unit, and the OSD processing unit (240) can include such a pointing control unit (not shown). Of course, the pointing control unit (not shown) can also be provided separately rather than being included within the OSD processing unit (240).

[0165] The frame rate converter (FRC) (350) can convert the frame rate of an input video. Meanwhile, the frame rate converter (350) can also output the video as is without a separate frame rate conversion.

[0166] Meanwhile, the formatter (360) can change the format of an input video signal into a video signal for display on a display and output it.

[0167] In particular, the formatter (360) can change the format of the video signal to correspond to the display panel.

[0168] The processor (330) can control the overall operation within the image display device (100) or the signal processing device (170).

[0169] For example, the processor (330) can control the tuner (110) to select (tune) an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

[0170] In addition, the processor (330) can control the image display device (100) by a user command or internal program input through the user input interface unit (150).

[0171] Additionally, the processor (330) can perform data transmission control with the network interface unit (135) or the external device interface unit (130).

[0172] Additionally, the processor (330) can control the operation of the demultiplexing unit (310), the image processing unit (320), etc., within the signal processing device (170).

[0173] Meanwhile, the audio processing unit (370) within the signal processing device (170) can perform audio processing of the demultiplexed audio signal. For this purpose, the audio processing unit (370) can be equipped with various decoders.

[0174] Additionally, the audio processing unit (370) within the signal processing device (170) can process bass, treble, volume control, etc.

[0175] A data processing unit (not shown) within a signal processing device (170) can perform data processing on a demultiplexed data signal. For example, if the demultiplexed data signal is an encoded data signal, it can be decoded. The encoded data signal may be electronic program guide information (EPG) information that includes broadcast information such as the start time and end time of a broadcast program broadcast on each channel.

[0176] Meanwhile, the block diagram of the signal processing device (170) illustrated in FIG. 4 is a block diagram for one embodiment of the present disclosure. Each component of the block diagram may be integrated, added, or omitted depending on the specifications of the signal processing device (170) actually implemented.

[0177] In particular, the frame image rate conversion unit (350) and the formatter (360) may be provided separately from the image processing unit (320).

[0178] Figure 4 is an internal block diagram of the display of Figure 2.

[0179] Referring to the drawing, a display (180) based on a light-emitting panel may include a light-emitting panel (210), a first interface unit (230), a second interface unit (231), a timing controller (232), a gate driver unit (234), a data driver unit (236), a memory (240), a power supply unit (290), etc.

[0180] The display (180) receives a video signal (Vd), a first DC power source (V1), and a second DC power source (V2), and can display a predetermined image based on the video signal (Vd).

[0181] Meanwhile, the first interface unit (230) within the display (180) can receive a video signal (Vd) and a first DC power source (V1) from the signal processing device (170).

[0182] Here, the first DC power supply (V1) can be used for the operation of the power supply (290) and the timing controller (232) within the display (180).

[0183] Next, the second interface unit (231) can receive a second DC power supply (V2) from an external power supply unit (190). Meanwhile, the second DC power supply (V2) can be input to a data drive unit (236) within the display (180).

[0184] The timing controller (232) can output a data driving signal (Sda) and a gate driving signal (Sga) based on a video signal (Vd).

[0185] For example, when the first interface unit (230) converts an input image signal (Vd) and outputs a converted image signal (va1), the timing controller (232) can output a data driving signal (Sda) and a gate driving signal (Sga) based on the converted image signal (va1).

[0186] The timing controller (232) can receive, in addition to the video signal (Vd) from the signal processing device (170), a control signal, a vertical synchronization signal (Vsync), etc.

[0187] In addition, the timing controller (232) can output a gate drive signal (Sga) for the operation of the gate drive unit (234) and a data drive signal (Sda) for the operation of the data drive unit (236) based on a control signal, a vertical synchronization signal (Vsync), etc., in addition to a video signal (Vd).

[0188] The data driving signal (Sda) at this time may be a data driving signal for driving RGB subpixels when the panel (210) has RGB subpixels.

[0189] Meanwhile, the timing controller (232) can further output a control signal (Cs) to the gate driver (234).

[0190] The gate driving unit (234) and the data driving unit (236) supply scan signals and data signals to the light-emitting panel (210) through the gate line (GL) and the data line (DL), respectively, in accordance with the gate driving signal (Sga) and the data driving signal (Sda) from the timing controller (232). Accordingly, the light-emitting panel (210) displays a predetermined image.

[0191] Meanwhile, the light-emitting panel (210) may include a light-emitting layer, and in order to display an image, a plurality of gate lines (GL) and data lines (DL) may be arranged in a matrix form to cross each pixel corresponding to the light-emitting layer.

[0192] Meanwhile, the gate line (GL) may also be called a scan line because a scan signal is input.

[0193] Meanwhile, the data driving unit (236) can output a data signal to the light-emitting panel (210) based on the second direct current power supply (V2) from the second interface unit (231).

[0194] The power supply unit (290) can supply various power sources to the gate driver unit (234), the data driver unit (236), the timing controller (232), etc.

[0195] Meanwhile, the timing controller (232), gate driver (234), and data driver (236) in the drawing can be implemented as a single integrated circuit (IC).

[0196] Accordingly, the timing controller (232), gate driver (234), and data driver (236) may be named a drive control unit (285).

[0197] Meanwhile, the drive control unit (285) may include a buffer (238) that stores frame data.

[0198] In particular, the timing controller (232) in the drive control unit (285) can output a gate drive signal and a data drive signal based on frame data stored in the buffer (238).

[0199] FIGS. 5A to 5C are drawings for reference in the description of the light-emitting panel of FIG. 4.

[0200] First, FIG. 5a is a drawing showing pixels within a light-emitting panel (210).

[0201] Referring to the drawing, the light-emitting panel (210) may have a plurality of scan lines (Scan 1 to Scan n) and a plurality of data lines (R1, G1, B1 to Rm, Gm, Bm) intersecting therewith.

[0202] Meanwhile, a pixel (subpixel) is defined in the intersection area of ​​the scan line and the data line within the light-emitting panel (210). In the drawing, a pixel (Pixel) having RGB subpixels (SR1, SG1, SB1) is illustrated.

[0203] Meanwhile, red light-emitting diodes, green light-emitting diodes, and blue light-emitting diodes are placed in each of the RGB subpixels (SR1, SG1, SB1).

[0204] FIG. 5b illustrates the circuit of one subpixel within a pixel of the light-emitting panel of FIG. 5a.

[0205] Referring to the drawing, the light-emitting sub-pixel circuit (CRTm) may be of a passive type and may only include a light-emitting diode (LED) without a separate switching element.

[0206] As shown in the drawing, the anode of the light emitting diode (LED) is connected to a data line, so that a data signal (Vdata) can be input, and the cathode of the light emitting diode (LED) is connected to a scan line, so that a scan signal (Vscan) can be input.

[0207] Meanwhile, light-emitting diodes can emit light or not, based on multiple sub-frames based on a passive matrix method.

[0208] Figure 5c is a diagram showing examples of scan signals and data signals.

[0209] Referring to the drawing, the scan signal (Vscan) applied to each of the red light-emitting diode, green light-emitting diode, and blue light-emitting diode maintains the LVb level and then drops to the LVa level at the scan timing.

[0210] At this time, the width of the scan signal (Vscan) can be set to Wa.

[0211] Meanwhile, red light-emitting diodes may have higher luminous efficiency than green light-emitting diodes and blue light-emitting diodes due to their device characteristics.

[0212] In response to this, the driving control unit (285) can control the level of the data signal supplied to the red light-emitting diode to be lower than the level of the data signal supplied to the green light-emitting diode or the blue light-emitting diode.

[0213] Figure 5c (b) illustrates a data signal (Vdata) that maintains the level of LVd and then rises to the level of LVc in response to the scan timing of the scan signal (Vscan).

[0214] (c) of Fig. 5c illustrates a data signal (Vdatam) that maintains the level of LVd and then rises to the LVe level, which is higher than the LVc level, in response to the scan timing of the scan signal (Vscan).

[0215] A data signal (Vdata) of LVc level can be applied to a red light-emitting diode, and a data signal (Vdatam) of LVe level higher than the LVc level is preferably applied to a green light-emitting diode or a blue light-emitting diode.

[0216] Accordingly, it is possible to output a data signal corresponding to the light-emitting diode, and further perform uniform color implementation.

[0217] Meanwhile, the data signal (Vdata) of (b) of Fig. 5c or the data signal (Vdatam) of (c) of Fig. 5c is a data signal based on pulse width variation, and the brightness of the light-emitting diode is varied by variation of the duty corresponding to the pulse width.

[0218] Fig. 6 is a drawing illustrating an example of the light-emitting panel of Fig. 4.

[0219] Referring to the drawing, the light-emitting panel (210) may have a plurality of data lines and a plurality of scan lines.

[0220] In Fig. 6, as an example of a light-emitting panel (210), for convenience of explanation, four data lines (Data 1 to Data 4) and four scan lines (Scan 1 to Scan 4) are illustrated.

[0221] FIGS. 7A to 8D are drawings for reference in explaining the operation of a video display device related to the present disclosure.

[0222] FIG. 7a illustrates an example of a data signal applied corresponding to a case where the frame grayscale is the first grayscale during a plurality of sub-frame periods within a frame period.

[0223] Referring to the drawing, a plurality of sub-frame periods (Subframe 1 to 3) may be provided within a frame period (Frame 1).

[0224] For convenience of explanation, the drawing illustrates three subframe periods (Subframe 1 to 3) within a frame period (Frame 1), but various variations are possible.

[0225] (a) of FIG. 7a illustrates that data signals (Vdata 1 to 4) are applied to each of the four data lines illustrated in FIG. 6 during the first subframe (Subframe 1) period among multiple subframe periods (Subframe 1 to 3).

[0226] In the drawing, during the first subframe (Subframe 1) period, data signals (Vdata 1 to 4) each having four pulses or voltages (Vx) on four data lines are illustrated.

[0227] At this time, the pulse width of the data signal (Vdata 1~4) can be Wx.

[0228] Figure 7a (b) illustrates that during the first subframe (Subframe 1), scan signals (Vscan 1 to 4) are sequentially applied to each of the four scan lines.

[0229] Accordingly, during the first subframe (Subframe 1) period, 16 light-emitting diodes emit light, as shown in (c) of Fig. 7a.

[0230] Figure 7a (a) illustrates that during the second subframe (Subframe 2) period, data signals (Vdata 1 to 4) are applied to each of the four data lines illustrated in Figure 6.

[0231] In the drawing, during the second subframe (Subframe 2) period, data signals (Vdata 1 to 4) each having one pulse or voltage (Vx) on four data lines are illustrated.

[0232] Figure 7a (b) illustrates that during the second subframe (Subframe 2) period, scan signals (Vscan 1 to 4) are sequentially applied to each of the four scan lines.

[0233] Accordingly, during the second subframe (Subframe 2) period, four light-emitting diodes in the diagonal direction emit light, as shown in (c) of Fig. 7a.

[0234] Figure 7a (a) illustrates that during the third subframe (Subframe 3) period, data signals (Vdata 1 to 4) are applied to each of the four data lines illustrated in Figure 6.

[0235] In the drawing, during the third subframe (Subframe 3) period, data signals (Vdata 1 to 4) each having one pulse or voltage (Vx) on four data lines are illustrated.

[0236] Figure 7a (b) illustrates that during the third subframe (Subframe 3), scan signals (Vscan 1 to 4) are sequentially applied to each of the four scan lines.

[0237] Accordingly, during the third subframe (Subframe 3), four light-emitting diodes in the diagonal direction emit light, as shown in (c) of Fig. 7a.

[0238] FIG. 7b illustrates an example of a data signal applied in response to a case where the frame grayscale is a second grayscale lower than the first grayscale during a plurality of sub-frame periods within a frame period.

[0239] (a) of FIG. 7b illustrates that during the first subframe (Subframe 1) period among multiple subframes (Subframes 1 to 3), data signals (Vdata 1 to 4) each having one pulse or voltage (Vx) are applied to the four data lines illustrated in FIG. 6, and during the second subframe (Subframe 2) period and the third subframe (Subframe 3) period, no pulse or voltage (Vx) is applied.

[0240] (b) of Fig. 7b illustrates that scan signals (Vscan 1 to 4) are sequentially applied to each of four scan lines during a period of multiple subframes (Subframe 1 to 3).

[0241] Accordingly, during the first subframe (Subframe 1) period, four light-emitting diodes in the diagonal direction, as shown in (c) of FIG. 7b, emit light, and during the second subframe (Subframe 2) period and the third subframe (Subframe 3) period, all 16 light-emitting diodes are turned off and do not emit light.

[0242] As shown in Fig. 7b, when multiple light-emitting diodes are turned off and do not emit light during some period of multiple subframes (Subframes 1 to 3), a flicker phenomenon occurs.

[0243] Figure 7c illustrates an on period (Pon) in which multiple light-emitting diodes are turned on and an off period (pff) in which they are turned off during a frame period (Frame 1) between vertical synchronization signals.

[0244] Referring to the drawing, when a plurality of light-emitting diodes are divided into an on period (Pon) in which they are turned on and an off period (Poff) in which they are turned off during a frame period (Frame 1), an image (790) displayed on the display can be exemplified as shown in the drawing.

[0245] In particular, the image (790) recognized by the user's eyes can be divided into a flicker-free area (Ara) and a flicker-producing area (Arb).

[0246] The area (Ara) without flicker at this time may correspond to the on period (Pon) in which multiple light-emitting diodes in the drawing are turned on, and the area (Arb) in which flicker occurs may correspond to the off period (Poff) in which multiple light-emitting diodes in the drawing are turned off.

[0247] FIG. 8a is a diagram illustrating an image (810) in a first mode in which the frame rate or vertical synchronization signal (Vsync) is variable.

[0248] The first mode can be either game mode or variable refresh rate (VRR) mode.

[0249] In the first mode, the frame rate or frequency of the vertical synchronization signal (Vsync) can be varied within a range of approximately 40 to 144 Hz.

[0250] Figure 8b illustrates an image display method of various frame rates or vertical synchronization signals (Vsync) in an active matrix display.

[0251] Referring to the drawing, an active matrix display has a scan switching element, a data switching element, and a storage capacitor within a pixel, so that data signals can be stored, and the image display period can be varied.

[0252] That is, as in (a) of Fig. 8b, at 120 Hz, the image (821) can be displayed for 1 / 120 second, as in (b) of Fig. 8b, at 144 Hz, the image (821) can be displayed for 1 / 144 second, and as in (c) of Fig. 8b, at 60 Hz, the image (821) can be displayed for 1 / 60 second.

[0253] FIG. 8c illustrates an example of how images are displayed at various frame rates or vertical synchronization signals (Vsync) in a passive matrix display.

[0254] Referring to the drawing, a passive matrix display does not have a scan switching element, a data switching element, a storage capacitor, etc., within the pixel circuit, and displays an image using only a scan signal and a data signal, so the image display period is determined by the pulse width of the scan signal.

[0255] Figure 8c illustrates a case where the pulse width of the scan signal is constant, and the frame rate or the frequency of the vertical synchronization signal (Vsync) is varied.

[0256] As shown in (a) of Fig. 8c, at 120 Hz, 16 images (831) can be displayed during 16 subfield periods, as shown in (b) of Fig. 8c, 14 images (833) can be displayed during 14 subfield periods, and as shown in (c) of Fig. 8c, at 60 Hz, 32 images (835) can be displayed during 32 subfield periods.

[0257] That is, as the frame rate or the frequency of the vertical synchronization signal (Vsync) increases, the number of subfield periods decreases, and accordingly, the corresponding number of images are displayed.

[0258] FIG. 8d illustrates another example of how images are displayed at various frame rates or vertical synchronization signals (Vsync) in a passive matrix display.

[0259] FIG. 8d illustrates, unlike FIG. 8c, that the pulse width of the scan signal is varied according to the variation of the frame rate or the frequency of the vertical synchronization signal (Vsync).

[0260] Specifically, a constant number of subfields are arranged even when the frame rate or the frequency of the vertical synchronization signal (Vsync) is variable.

[0261] That is, Fig. 8d illustrates a case where the pulse width of the scan signal is varied when the frame rate or the frequency of the vertical synchronization signal (Vsync) is varied.

[0262] Accordingly, as shown in (a) of FIG. 8d, 14 images (841) can be displayed during 14 sub-field periods at 120 Hz, as shown in (b) of FIG. 8d, 14 images (843) can be displayed during 14 sub-field periods, and as shown in (c) of FIG. 8d, 14 images (845) can be displayed during 14 sub-field periods at 60 Hz.

[0263] That is, even if the frame rate or the frequency of the vertical synchronization signal (Vsync) increases, the number of subfield periods remains constant, and thus, a constant number of images are displayed.

[0264] FIG. 8e is a diagram illustrating a driving method when the frequency of the frame rate or vertical synchronization signal (Vsync) is the first frequency and the second frequency.

[0265] Figure 8e (a) illustrates the light sensor waveform (GRax), sub-frame waveform (GRbx), vertical synchronization signal input waveform (GRcx), and vertical synchronization signal output waveform (GRdx) when the frequency of the frame rate or vertical synchronization signal (Vsync) is the first frequency.

[0266] Figure 8e (b) illustrates the light sensor waveform (GRay), sub-frame waveform (GRby), vertical synchronization signal input waveform (GRcy), and vertical synchronization signal output waveform (GRdy) when the frequency of the frame rate or vertical synchronization signal (Vsync) is a second frequency lower than the first frequency.

[0267] At this time, the first frequency may be 120 Hz and the second frequency may be 70 Hz.

[0268] When configuring frame data and sub-frame data within the frame data based on the first frequency, it is possible to arrange sub-frames at regular intervals, as in the sub-frame waveform (GRbx) of (a) of Fig. 8e, but when the frequency is varied to the second frequency, a part in which the sub-frame arrangement within the frame data is omitted appears.

[0269] Accordingly, in the light sensor waveform (GRay) of (b) of Fig. 8e, a section with low light intensity occurs after the section where the sub-frame arrangement is omitted. This section with low light intensity has the disadvantage of causing flicker.

[0270] In this disclosure, a method for reducing flicker when the frame rate or vertical synchronization signal is variable is proposed. This is described with reference to FIG. 9a.

[0271] FIG. 9a is a flowchart showing an operation method of an image display device according to one embodiment of the present disclosure.

[0272] Referring to the drawing, the driving control unit (285) in the image display device (100) according to one embodiment of the present disclosure controls to drive at a constant frame rate when the image output mode is normal mode (S910) (S913).

[0273] For example, the drive control unit (285) can output a scan signal and a data signal based on a constant frame rate when the image output mode is normal mode.

[0274] Specifically, the drive control unit (285) can output a scan signal and a data signal based on 60 Hz, as an example of a constant frame rate, when the image output mode is normal mode.

[0275] Meanwhile, in step 910 (S910), if the video output mode is not the normal mode, the driving control unit (285) determines whether the video output mode is the game mode or the variable refresh rate mode (S915), and if so, varies the frame rate (S920).

[0276] The drive control unit (285) can vary the frame rate or the frequency of the vertical synchronization signal (Vsync) within a range of approximately 40 to 144 Hz when the video output mode is a game mode or a variable refresh rate mode.

[0277] Next, the drive control unit (285) determines whether the range of the variable frame rate is the first range (S923).

[0278] The first range at this time may be when the frequency of the vertical synchronization signal (Vsync) is approximately 40 Hz or more and less than 60 Hz.

[0279] Next, the drive control unit (285) performs frame repeating and sub-frame cutting when the frame rate or the frequency of the vertical synchronization signal (Vsync) is in the first range (S926).

[0280] Meanwhile, in step 923 (S923), if the range of the variable frame rate is not the first range, the driving control unit (285) determines whether it is the second range (S930), and if so, skips frame repeating and performs sub-frame cutting (S933).

[0281] The second range at this time may be when the frequency of the vertical synchronization signal (Vsync) is approximately greater than 60 Hz and less than or equal to 144 Hz.

[0282] Meanwhile, step 923 (S923) may have the same meaning as determining whether the frequency of the vertical synchronization signal (Vsync) is less than the reference frequency.

[0283] Meanwhile, step 930 (S930) may have the same meaning as determining whether the frequency of the vertical synchronization signal (Vsync) exceeds the reference frequency.

[0284] Meanwhile, frame repeating can refer to repeatedly outputting frame data.

[0285] Subframe cutting may be a method of outputting only some of the multiple subframe data within the frame data and not outputting other parts.

[0286] The driving control unit (285) in the image display device (100) according to one embodiment of the present disclosure is in a first mode in which the frame rate or vertical synchronization signal (Vsync) is variable, and when the frequency of the variable vertical synchronization signal (Vsync) is lower than the reference frequency, the driving control unit (285) repeats the frame data stored in the buffer (2238), and controls so that only a part of the sub-frame data in the repeated frame data is output, and the other part is not output.

[0287] That is, according to step 926 (S926), the drive control unit (285) performs frame repeating and sub-frame cutting.

[0288] Accordingly, flicker can be reduced when the frame rate or vertical sync signal is variable.

[0289] The first mode at this time can be game mode or variable refresh rate mode.

[0290] Meanwhile, the drive control unit (285) is a first mode in which the frame rate or vertical synchronization signal (Vsync) is variable, and when the frequency of the variable vertical synchronization signal (Vsync) exceeds the reference frequency, it can control so that only a part of the sub-frame data within the frame data is output and the other part is not output.

[0291] That is, according to step 933 (S933), the drive control unit (285) performs frame repeating and sub-frame cutting.

[0292] Accordingly, flicker can be reduced when the frame rate or vertical sync signal is variable.

[0293] Meanwhile, the drive control unit (285) can control to output all sub-frame data within the frame data in the first mode in which the frame rate or vertical synchronization signal (Vsync) is variable, and the frequency of the variable vertical synchronization signal (Vsync) is the reference frequency.

[0294] For example, the reference frequency may be 60 Hz.

[0295] Specifically, the drive control unit (285) can control to output all sub-frame data within the frame data without sub-frame cutting when the frequency of the variable vertical synchronization signal (Vsync) is the reference frequency of 60 Hz. Accordingly, when the frequency of the vertical synchronization signal (Vsync) is variable, it is possible to display an image without image flicker.

[0296] Meanwhile, the driving control unit (285), in the first mode, controls the number of sub-frames within a frame to vary in response to the frequency of a variable vertical synchronization signal (Vsync), but can control the interval between the multiple sub-frame periods to be constant.

[0297] Meanwhile, the driving control unit (285) is a first mode in which the frame rate or vertical synchronization signal (Vsync) is variable, and when the frequency of the variable vertical synchronization signal (Vsync) is less than a reference frequency, a first number of sub-frame periods can be set, and when it exceeds the reference frequency, a second number of sub-frame periods smaller than the first number can be set.

[0298] For example, the drive control unit (285) can set 48 sub-frame periods when the frequency of the variable vertical synchronization signal (Vsync) is 45 Hz, which is less than the reference frequency, and can set 16 sub-frame periods when the frequency of the variable vertical synchronization signal (Vsync) is 120 Hz, which is greater than the reference frequency.

[0299] Meanwhile, the driving control unit (285) can set 32 ​​sub-frame periods when the frequency of the variable vertical synchronization signal (Vsync) is 60 Hz, which is the reference frequency, as shown in FIG. 8c, set 16 sub-frame periods when the frequency of the variable vertical synchronization signal (Vsync) is 120 Hz, which is higher than the reference frequency, and set 14 sub-frame periods when the frequency of the variable vertical synchronization signal (Vsync) is 1440 Hz, which is higher than the reference frequency.

[0300] Accordingly, flicker can be reduced when the frame rate or vertical sync signal is variable.

[0301] Meanwhile, the driving control unit (285) is a first mode in which the frame rate or vertical synchronization signal (Vsync) is variable, and can be set so that the sub-frame period when the frequency of the variable vertical synchronization signal (Vsync) is less than the reference frequency and the sub-frame period when it exceeds the reference frequency are the same.

[0302] For example, the driving control unit (285) may set 48 sub-frame periods so that each sub-frame period becomes the first period when the frequency of the variable vertical synchronization signal (Vsync) is 45 Hz, which is less than the reference frequency, and may set 16 sub-frame periods so that each sub-frame period becomes the first period when the frequency of the variable vertical synchronization signal (Vsync) is 120 Hz, which is greater than the reference frequency.

[0303] Meanwhile, the driving control unit (285) may set 32 ​​sub-frame periods so that each sub-frame period becomes the first period, as shown in FIG. 8c, when the frequency of the variable vertical synchronization signal (Vsync) is 60 Hz, which is the reference frequency, and may set 16 sub-frame periods so that each sub-frame period becomes the first period, and may set 14 sub-frame periods so that each sub-frame period becomes the first period, when the frequency of the variable vertical synchronization signal (Vsync) is 120 Hz, which is higher than the reference frequency.

[0304] Accordingly, flicker can be reduced when the frame rate or vertical sync signal is variable.

[0305] Meanwhile, the drive control unit (285) can control to output all sub-frame data within the frame data when the frame rate or vertical synchronization signal (Vsync) is in a constant second mode. The second mode at this time may be a normal mode.

[0306] Meanwhile, the drive control unit (285) can set the frame rate or the frequency of the vertical synchronization signal (Vsync) as a reference frequency when the image output mode is normal mode, and configure and output frame data.

[0307] That is, when the image output mode is normal mode, the driving control unit (285) can set 32 ​​sub-frame periods corresponding to the reference frequency of 60 Hz and set each sub-frame period to be the first period. Accordingly, image data can be output stably.

[0308] Meanwhile, the driving control unit (285) can control, in the case of the first mode in which the frame rate or vertical synchronization signal (Vsync) is variable, to prevent a non-luminous period from occurring during a plurality of sub-frame periods during the period between vertical synchronization signals (Vsync). Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0309] Meanwhile, the driving control unit (285) can control the interval between multiple sub-frame periods to be constant during the period between vertical synchronization signals (Vsync) in the first mode in which the frame rate or vertical synchronization signal (Vsync) is variable. Accordingly, flicker can be reduced in the case in which the frame rate or vertical synchronization signal is variable.

[0310] Meanwhile, the drive control unit (285) can control the scan cycle of the scan signal to be constant during the period between vertical synchronization signals (Vsync) in the first mode in which the frame rate or vertical synchronization signal (Vsync) is variable. Accordingly, flicker can be reduced in the case in which the frame rate or vertical synchronization signal is variable.

[0311] FIG. 9b is a flowchart showing an operation method of an image display device according to another embodiment of the present disclosure.

[0312] Referring to the drawing, the driving control unit (285) in the image display device (100) according to one embodiment of the present disclosure controls to drive at a frequency of a constant vertical synchronization signal when the image output mode is normal mode (S960) (S965).

[0313] For example, when the image output mode is normal mode, the drive control unit (285) can output a scan signal and a data signal based on a vertical synchronization signal based on a constant frame rate, for example, 60 Hz. The pulse width of the scan signal at this time can be the first level.

[0314] Meanwhile, in step 960 (S960), if the image output mode is not the normal mode, the driving control unit (285) determines whether the image output mode is the game mode or the variable scan rate mode (S970), and if so, changes the frequency of the vertical synchronization signal and controls the cycle of the scan signal to be constant (S975).

[0315] The drive control unit (285) can vary the frame rate or the frequency of the vertical synchronization signal (Vsync) within a range of approximately 40 to 144 Hz when the video output mode is a game mode or a variable refresh rate mode.

[0316] In response to this, the drive control unit (285) can vary the number of sub-frames, as shown in FIG. 8c, when the frequency of the vertical synchronization signal (Vsync) is varied.

[0317] In addition, the drive control unit (285) can control the cycle of the scan signal to be constant when the frequency of the vertical synchronization signal (Vsync) is varied.

[0318] That is, the drive control unit (285) can control the interval of the scan signal or the interval of the sub-frame to be constant when the frequency of the vertical synchronization signal (Vsync) is varied. Accordingly, the cycle of the scan signal can be constant.

[0319] The second range at this time may be when the frequency of the vertical synchronization signal (Vsync) exceeds approximately 60 Hz and is less than or equal to 144 Hz. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal is variable.

[0320] Figures 10a to 10e are drawings referenced in the description of Figure 9a or Figure 9b.

[0321] Figure 10a is an example of an internal block diagram of a drive control unit for variable frame rate.

[0322] Referring to the drawing, the driving control unit (285) may include a controller (1010) that outputs pixel data and start point information of the vertical synchronization signal based on image data (SGa) whose frame rate or frequency of the vertical synchronization signal (Vsync) varies between 40 and 144 Hz, and a data output unit (1020) that outputs corresponding image data (SGd) based on the pixel data and the start point information.

[0323] Meanwhile, the image data (SGa) that varies between 40 and 144 Hz may be image data received from the signal processing device (170).

[0324] For example, the signal processing device (170) can output 60Hz-based image data when the image output mode is normal mode.

[0325] As another example, the signal processing device (170) can output image data (SGa) based on 40 to 144 Hz when the image output mode is a game mode or a variable refresh rate mode.

[0326] The controller (1010) can receive image data (SGa) based on 40 to 144 Hz, and can output pixel data (SGb) based on 144 Hz, which is the highest frequency, for image quality processing.

[0327] Meanwhile, the controller (1010) can further output a clock signal based on the highest frequency, 144 Hz.

[0328] Meanwhile, the controller (1010) can output start point information (SGc) of a variable vertical synchronization signal in response to a frame rate variation between 40 and 144 Hz.

[0329] The data output unit (1020) can output image data (SGd) based on a reference frequency of 60 Hz, based on pixel data (SGb) and start point information (SGc) of a vertical synchronization signal.

[0330] At this time, the driving control unit (285) controls the number of sub-frames within a frame to vary in response to the frequency of the variable vertical synchronization signal (Vsync) when the video output mode is a game mode or a variable refresh rate mode, but controls the interval between the multiple sub-frame periods to be constant.

[0331] FIG. 10b is a diagram illustrating sub-frame data output when the video output mode is game mode or variable refresh rate mode.

[0332] Figure 10b (a) illustrates that the frequency of the vertical synchronization signal (Vsync) varies from 40 to 144 Hz.

[0333] Meanwhile, the driving control unit (285) can control to perform frame repeating and sub-frame cutting when the video output mode is a game mode or a variable refresh rate mode and the frequency of the variable vertical synchronization signal (Vsync) is lower than the reference frequency.

[0334] As shown in (b) of Fig. 10b, when the frequency of the vertical synchronization signal (Vsync) is 40 Hz or more and less than 60 Hz, which is less than the reference frequency, the driving control unit (285) can use the start point information (SGc) of the vertical synchronization signal to place frame data (FRa) and copied repeated frame data (FRa2) between two vertical synchronization signals (Vsync).

[0335] In addition, the driving control unit (285) controls a part of the repetitive frame data (FRa2) arranged within the second vertical synchronization signal (Vsync) to be output, and controls another part of the repetitive frame data (FRa2) arranged outside the second vertical synchronization signal (Vsync) to not be output.

[0336] Meanwhile, the drive control unit (285) can control to output all sub-frame data within the frame data when the image output mode is a game mode or a variable refresh rate mode and the frequency of the variable vertical synchronization signal (Vsync) is a reference frequency.

[0337] As shown in (c) of Fig. 10b, when the frequency of the vertical synchronization signal (Vsync) is 60 Hz, which is the reference frequency, the drive control unit (285) can place frame data (FRb) between two vertical synchronization signals (Vsync) using the start point information (SGc) of the vertical synchronization signal.

[0338] Since the data output unit (1020) outputs image data (SGd) based on the reference frequency of 60 Hz, the driving control unit (285) can output all of the multiple sub-frame data within the frame data (FRb).

[0339] Meanwhile, the driving control unit (285) can control to perform sub-frame cutting when the video output mode is a game mode or a variable injection rate mode and the frequency of the variable vertical synchronization signal (Vsync) exceeds the reference frequency.

[0340] As shown in (d) of Fig. 10b, when the frequency of the vertical synchronization signal (Vsync) is greater than 60 Hz, which is greater than the reference frequency, and less than or equal to 144 Hz, the drive control unit (285) can place frame data (FRc) between two vertical synchronization signals (Vsync) using the start point information (SGc) of the vertical synchronization signal.

[0341] In addition, the driving control unit (285) controls a part of the frame data (FRc) arranged within the second vertical synchronization signal (Vsync) to be output, and controls another part of the frame data (FRc) arranged outside the second vertical synchronization signal (Vsync) to not be output.

[0342] Accordingly, flicker can be reduced when the frame rate or vertical sync signal is variable.

[0343] Meanwhile, the driving control unit (285) can respond to the case of (c) of Fig. 10b when the image output mode is normal mode.

[0344] That is, when the image output mode is normal mode, the drive control unit (285) can output a scan signal and a data signal corresponding to a certain number of sub-frames within a frame, based on a reference frequency, which is the frequency of a certain vertical synchronization signal (Vsync).

[0345] FIG. 10c illustrates a light sensor waveform (GRam), a sub-frame waveform (GRbm), a vertical synchronization signal input waveform (GRcm), and a vertical synchronization signal output waveform (GRdm) when the frequency of the frame rate or vertical synchronization signal (Vsync) is the first frequency.

[0346] At this time, the first frequency may be 120 Hz.

[0347] Referring to the drawing, the driving control unit (285) can control, in the case of the first mode in which the frame rate or the vertical synchronization signal (Vsync) is variable, so that a non-luminous period does not occur during a plurality of sub-frame periods during the period between the vertical synchronization signals (Vsync), as shown in FIG. 10c. Accordingly, flicker can be reduced when the frame rate or the vertical synchronization signal is variable.

[0348] FIG. 10d illustrates a light sensor waveform (GRan), a sub-frame waveform (GRbn), a vertical synchronization signal input waveform (GRcn), and a vertical synchronization signal output waveform (GRdn) when the frequency of the frame rate or vertical synchronization signal (Vsync) is a second frequency lower than the first frequency.

[0349] Referring to the drawing, the driving control unit (285) can control, in the case of the first mode in which the frame rate or the vertical synchronization signal (Vsync) is variable, so that a non-luminous period does not occur during a plurality of sub-frame periods during the period between the vertical synchronization signals (Vsync), as shown in FIG. 10d. Accordingly, flicker can be reduced when the frame rate or the vertical synchronization signal is variable.

[0350] At this time, the second frequency may be 70 Hz.

[0351] Compared to Fig. 8e, Fig. 10d does not omit subframe arrangements, and multiple subframe periods are arranged during periods between vertical synchronization signals (Vsync). Therefore, a period in which the light quantity is low does not occur.

[0352] FIG. 10e illustrates a light sensor waveform (GRao), a sub-frame waveform (GRbo), a vertical synchronization signal input waveform (GRco), and a vertical synchronization signal output waveform (GRdo) when the vertical synchronization signal (Vsync) varies from the first level to the second level.

[0353] Referring to the drawing, the vertical synchronization signal (Vsync) may be at the first level between the Ta time point and the Tb time point, and the vertical synchronization signal (Vsync) may be at the second level between the Tb time point and the Tc time point.

[0354] For example, the first level may be 60 Hz, the second level may be 70 Hz, etc.

[0355] Meanwhile, the driving control unit (285) can control, as shown in FIG. 10e, so that a non-lighting period does not occur during a plurality of sub-frame periods during the period between vertical synchronization signals (Vsync) when the frame rate or vertical synchronization signal (Vsync) varies from the first level to the second level. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal varies.

[0356] Meanwhile, the drive control unit (285) can control the interval (GPa) of multiple sub-frame periods to be constant during the period between vertical synchronization signals (Vsync), as shown in FIG. 10e, when the frame rate or vertical synchronization signal (Vsync) varies from the first level to the second level. Accordingly, flicker can be reduced when the frame rate or vertical synchronization signal varies.

[0357] Meanwhile, the drive control unit (285) can control the scan period (GPa) of the scan signal to be constant during the period between the vertical synchronization signals (Vsync), as shown in FIG. 10e, when the frame rate or the vertical synchronization signal (Vsync) varies from the first level to the second level. Accordingly, flicker can be reduced when the frame rate or the vertical synchronization signal varies.

[0358] Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the present invention pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea or prospect of the present disclosure.

Claims

1. A panel having a plurality of light-emitting diodes; A driving control unit that outputs a scan signal for each of a plurality of sub-frame periods to the plurality of light-emitting diodes; The above driving control unit, Contains a buffer that stores frame data, The above driving control unit, A video display device in which the frame rate or vertical synchronization signal is variable in the first mode, and in which, when the frequency of the variable vertical synchronization signal is lower than the reference frequency, the frame data stored in the buffer is repeated, and only a part of the sub-frame data within the repeated frame data is output, and the other part is controlled so that it is not output.

2. In paragraph 1, The above driving control unit, A video display device in which the frame rate or vertical synchronization signal is variable in the first mode, and in which, when the frequency of the variable vertical synchronization signal exceeds the reference frequency, only a part of the sub-frame data within the frame data is output, and the other part is controlled not to be output.

3. In paragraph 1, The above driving control unit, A video display device in which the first mode is variable in the frame rate or vertical synchronization signal, and in which the frequency of the variable vertical synchronization signal is the reference frequency, all sub-frame data within the frame data is controlled to be output.

4. In paragraph 2, The above driving control unit, A video display device in which the first mode is variable in the frame rate or vertical synchronization signal, and a first number of sub-frame periods are set when the frequency of the variable vertical synchronization signal is less than the reference frequency, and a second number of sub-frame periods are set less than the first number when the frequency exceeds the reference frequency.

5. In paragraph 2, The above driving control unit, A video display device in which the first mode is variable in which the frame rate or vertical synchronization signal is variable, and the sub-frame period when the frequency of the variable vertical synchronization signal is less than the reference frequency and the sub-frame period when the frequency exceeds the reference frequency are set to be the same.

6. In paragraph 2, The above driving control unit, A video display device that controls to output all sub-frame data within the frame data when the above frame rate or vertical synchronization signal is a constant second mode.

7. In paragraph 1, The above driving control unit, A display device, wherein, in the case of the first mode in which the frame rate or vertical synchronization signal is variable, a non-luminous period is controlled so that no non-luminous period occurs during a plurality of sub-frame periods during the period between the vertical synchronization signals.

8. In paragraph 1, The above driving control unit, A video display device in which, when the frame rate or vertical synchronization signal is variable in the first mode, the interval between the plurality of sub-frame periods is controlled to be constant during the period between the vertical synchronization signals.

9. In paragraph 1, The above driving control unit, A display device in which, when the frame rate or vertical synchronization signal is the first mode in which the frame rate or vertical synchronization signal is variable, the scan cycle of the scan signal is controlled to be constant during the period between the vertical synchronization signals.

10. In paragraph 1, The above driving control unit, A display device that controls so that, when the frame rate or vertical synchronization signal changes from a first level to a second level, a non-emission period does not occur during a plurality of sub-frame periods during a period between the vertical synchronization signals.

11. In paragraph 1, The above driving control unit, A video display device that controls the interval between multiple sub-frame periods to be constant during a period between the vertical synchronization signals when the frame rate or vertical synchronization signal is varied from a first level to a second level.

12. In paragraph 1, The above driving control unit, A display device that controls the scan cycle of a scan signal to be constant during a period between the vertical synchronization signals when the frame rate or vertical synchronization signal changes from a first level to a second level.

13. In paragraph 1, The above driving control unit, A video display device in which, in the case of the first mode, the number of sub-frames within a frame is controlled to vary in response to the frequency of a variable vertical synchronization signal, but the interval between the periods of multiple sub-frames is controlled to be constant.

14. In paragraph 1, The above plurality of light emitting diodes are, Includes red light-emitting diodes, green light-emitting diodes, and blue light-emitting diodes, The above driving control unit, An image display device that controls the level of the data signal supplied to the red light-emitting diode to be lower than the level of the data signal supplied to the green light-emitting diode or the blue light-emitting diode.

15. In paragraph 1, A video display device further comprising a signal processing device that outputs a video signal to the display.

16. A panel having a plurality of light-emitting diodes; A driving control unit that outputs a scan signal for each of a plurality of sub-frame periods to the plurality of light-emitting diodes; The above driving control unit, A video display device that controls the number of sub-frames within a frame to vary in response to the frequency of a variable vertical synchronization signal when the video output mode is a game mode or a variable refresh rate mode, but controls the interval between multiple sub-frame periods to be constant.

17. In paragraph 16, The above driving control unit, A video display device in which the video output mode is the game mode or the variable refresh rate mode, and the frequency of the variable vertical synchronization signal is lower than the reference frequency, and the device controls frame repeating and sub-frame cutting.

18. In paragraph 17, The above driving control unit, A video display device in which the video output mode is the game mode or the variable refresh rate mode, and the frequency of the variable vertical synchronization signal exceeds the reference frequency, is controlled to perform the sub-frame cutting.

19. In paragraph 16, The above driving control unit, A video display device that outputs a scan signal and a data signal respectively in response to a certain number of sub-frames within a frame based on the frequency of a certain vertical synchronization signal when the video output mode is normal mode.

20. Includes multiple video display devices; The above video display device, A video wall comprising a video display device according to any one of claims 1 to 19.

Images