Image display device and video wall having same

Abstract

The present invention relates to an image display device and a video wall having same. The image display device according to an embodiment of the present invention includes: a panel including a plurality of light emitting diodes; and a driving controller that outputs scan signals for each of a plurality of sub-frame periods and data signals for displaying images to the plurality of light emitting diodes. The driving controller controls to sequentially turn on the plurality of light emitting diodes in a first pixel group on the basis of first frame data during a first frame period, controls to sequentially turn on the plurality of light emitting diodes in the first pixel group during a second frame period following the first frame period when second frame data is identical to the first frame data, and controls so that the light emitting diodes turned on in the first pixel group during a first sub-frame period of the second frame period are different from the light emitting diodes turned on in the first pixel group during a first sub-frame period of the first frame period. Accordingly, flickering can be reduced.

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 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] Meanwhile, depending on the gradation of the video signal, a corresponding data signal is applied during a plurality of sub-frame periods, causing the light-emitting diode to emit light.

[0007] Meanwhile, when a light-emitting diode operates based on a pulse width-based data signal, if the off period is greater than the on period within a frame period, a flicker phenomenon occurs.

[0008] In particular, in the case of low grayscale, even if the frame rate is high, the off period becomes larger than the on period within the frame period, so the flicker phenomenon becomes prominent.

[0009] The problem of the present disclosure is to provide a video display device capable of reducing flicker 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 at low grayscale and a video wall having the same.

[0011] Another object of the present disclosure is to provide a video display device capable of reducing flicker in response to ambient illuminance and a video wall having the same.

[0012] According to one embodiment of the present disclosure for achieving the above-described problem, an image 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 and outputs a data signal for image display, wherein the driving control unit controls the plurality of light-emitting diodes in a first pixel group to be sequentially turned on based on first frame data during a first frame period, and controls the plurality of light-emitting diodes in the first pixel group to be sequentially turned on during a second frame period after the first frame period when the second frame data is the same as the first frame data, and controls the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the second frame period to be different from the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the first frame period.

[0013] Meanwhile, the driving control unit can control the light-emitting diodes to be turned on differently during each sub-frame period within the first frame period based on the first frame data.

[0014] Meanwhile, the driving control unit can control the light-emitting diodes to be turned on differently during each sub-frame period within the second frame period based on the first frame data.

[0015] Meanwhile, the driving control unit can control the light-emitting diodes to be turned on differently during each sub-frame period within the first frame period and each sub-frame period within the second frame period, when the second frame data is the same as the first frame data during the second frame period.

[0016] Meanwhile, the driving control unit may control a plurality of light-emitting diodes in the first pixel group to be sequentially turned on when the grayscale of the first pixel group is lower than or equal to a reference value during the first frame period, and may control a plurality of light-emitting diodes in the first pixel group to be sequentially turned on when the grayscale of the first pixel group is lower than or equal to a reference value during the second frame period, and may control the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the second frame period to be different from the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the first frame period.

[0017] Meanwhile, the driving control unit may control a plurality of light-emitting diodes in the second pixel group to be sequentially turned on when the grayscale of the second pixel group, which is different from the first pixel group, exceeds a reference value during the first frame period, and may control a plurality of light-emitting diodes in the second pixel group to be sequentially turned on when the grayscale of the second pixel group exceeds a reference value during the second frame period, and may control the light-emitting diodes turned on in the second pixel group during each sub-frame period within the second frame period to overlap partially.

[0018] Meanwhile, the driving control unit can vary the reference value based on the illuminance around the panel.

[0019] Meanwhile, the driving control unit can increase the reference value as the illuminance around the panel increases.

[0020] Meanwhile, the drive control unit can vary the frame rate based on the illumination around the panel.

[0021] Meanwhile, the driving control unit can control the frame rate to decrease as the illumination around the panel increases.

[0022] Meanwhile, the driving control unit may set the first pixel group to a first size so that the first pixel group includes a first number of light-emitting diodes when the average brightness level of the first frame period and the average brightness level of the second frame period are equal to or lower than a first predetermined value.

[0023] Meanwhile, the driving control unit may set the first pixel group to a second size smaller than the first size when the average brightness level of the first frame period and the average brightness level of the second frame period exceed the first predetermined value, so that the first pixel group includes a second number of light-emitting diodes smaller than the first number.

[0024] Meanwhile, the driving control unit can vary the size of the first pixel group or the number of light-emitting diodes included therein based on the average brightness level of the first frame period or the second frame period.

[0025] Meanwhile, the driving control unit may control a plurality of light-emitting diodes in the first pixel group to be sequentially turned on based on the first frame data during the first frame period, and may control a plurality of light-emitting diodes in the first pixel group to be sequentially turned on during the second frame period after the first frame period when the second frame data is different from the first frame data, and may control a light-emitting diode turned on in the first pixel group during the first sub-frame period within the second frame period to be different from a light-emitting diode turned on in the first pixel group during the first sub-frame period within the first frame period.

[0026] Meanwhile, the driving control unit may control a plurality of light-emitting diodes in the first pixel group to be randomly and sequentially turned on during each sub-frame period within the first frame period when the grayscale of the first pixel group is lower than or equal to a reference value during the first frame period, and may control a plurality of light-emitting diodes in the first pixel group to be randomly and sequentially turned on during each sub-frame period within the second frame period when the grayscale of the first pixel group is lower than or equal to a reference value during the second frame period, and may control a light-emitting diode turned on in the first pixel group during the first sub-frame period within the second frame period to be different from a light-emitting diode turned on in the first pixel group during the first sub-frame period within the first frame period.

[0027] According to another embodiment of the present disclosure, an image 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 and outputs a data signal for image display, wherein the driving control unit controls the plurality of light-emitting diodes in the first pixel group to be randomly turned on during each sub-frame period within the first frame period and the second frame period when the grayscale of the first pixel group is lower than or equal to a reference value during a first frame period and a second frame period, and controls the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the second frame period to be different from the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the first frame period.

[0028] 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 and outputs a data signal for image display, wherein the driving control unit controls a plurality of light emitting diodes in a first pixel group to be sequentially turned on based on first frame data during a first frame period, and controls a plurality of light emitting diodes in the first pixel group to be sequentially turned on during a second frame period after the first frame period when the second frame data is the same as the first frame data, and controls a light emitting diode turned on in the first pixel group during the first sub-frame period within the second frame period to be different from a light emitting diode turned on in the first pixel group during the first sub-frame period within the first frame period.

[0029] 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 outputs a data signal for image display, wherein the driving control unit controls the plurality of light-emitting diodes in the first pixel group to be randomly turned on during each sub-frame period within the first frame period and the second frame period when the grayscale of the first pixel group is lower than or equal to a reference value during a first frame period and a second frame period, and controls the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the second frame period to be different from the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the first frame period.

[0030] According to one embodiment of the present disclosure, an image 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 and outputs a data signal for image display, wherein the driving control unit controls, during a first frame period, a plurality of light-emitting diodes in a first pixel group to be sequentially turned on based on first frame data, and, during a second frame period after the first frame period, when the second frame data is identical to the first frame data, controls, during a second frame period, a plurality of light-emitting diodes in the first pixel group to be sequentially turned on, and controls, during a first sub-frame period within the second frame period, a light-emitting diode turned on in the first pixel group is different from a light-emitting diode turned on in the first sub-frame period within the first frame period. Accordingly, flicker can be reduced.

[0031] Meanwhile, the driving control unit can control the light-emitting diodes to be turned on differently during each sub-frame period within the first frame period based on the first frame data. Accordingly, flicker can be reduced.

[0032] Meanwhile, the driving control unit can control the light-emitting diodes to be turned on differently during each sub-frame period within the second frame period based on the first frame data. Accordingly, flicker can be reduced.

[0033] Meanwhile, the driving control unit can control the light-emitting diodes to be turned on differently during each sub-frame period within the first frame period and each sub-frame period within the second frame period, when the second frame data is identical to the first frame data during the second frame period. Accordingly, flicker can be reduced.

[0034] Meanwhile, the driving control unit may control a plurality of light-emitting diodes within the first pixel group to be sequentially turned on when the grayscale of the first pixel group is lower than or equal to a reference value during the first frame period, and may control a plurality of light-emitting diodes within the first pixel group to be sequentially turned on when the grayscale of the first pixel group is lower than or equal to a reference value during the second frame period, and may control the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the second frame period to be different from the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the first frame period. Accordingly, flicker can be reduced at low grayscales.

[0035] Meanwhile, the driving control unit may control a plurality of light-emitting diodes in the second pixel group to be sequentially turned on when the grayscale of the second pixel group, which is different from the first pixel group, exceeds a reference value during the first frame period, and may control a plurality of light-emitting diodes in the second pixel group to be sequentially turned on when the grayscale of the second pixel group exceeds a reference value during the second frame period, and may control the light-emitting diodes turned on in the second pixel group during each sub-frame period within the second frame period to partially overlap with the light-emitting diodes turned on in the second pixel group during each sub-frame period within the first frame period. Accordingly, flicker can be reduced.

[0036] Meanwhile, the drive control unit can vary the reference value based on the ambient illuminance of the panel. This allows flicker to be reduced in response to the ambient illuminance.

[0037] Meanwhile, the drive control unit can increase the reference value as the ambient illumination around the panel increases. This allows flicker to be reduced in response to the ambient illumination.

[0038] Meanwhile, the drive control unit can vary the frame rate based on the ambient illumination around the panel. This allows flicker to be reduced in response to the ambient illumination.

[0039] Meanwhile, the drive control unit can control the frame rate to decrease as the illumination around the panel increases. This can reduce flickering.

[0040] Meanwhile, the driving control unit may set the first pixel group to a first size so that the first pixel group includes a first number of light-emitting diodes when the average brightness level of the first frame period and the average brightness level of the second frame period are equal to or lower than a first predetermined value. Accordingly, flicker can be reduced.

[0041] Meanwhile, the driving control unit may set the first pixel group to a second size smaller than the first size when the average brightness level of the first frame period and the average brightness level of the second frame period exceed the first predetermined value, so that the first pixel group includes a second number of light-emitting diodes smaller than the first number. Accordingly, flicker can be reduced.

[0042] Meanwhile, the driving control unit can vary the size of the first pixel group or the number of light-emitting diodes included in the first pixel group based on the average brightness level of the first frame period or the second frame period. Accordingly, flicker can be reduced.

[0043] Meanwhile, the driving control unit may control a plurality of light-emitting diodes in the first pixel group to be sequentially turned on based on the first frame data during the first frame period, and, during the second frame period after the first frame period, if the second frame data is different from the first frame data, control a plurality of light-emitting diodes in the first pixel group to be sequentially turned on, and control the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the second frame period to be different from the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the first frame period. Accordingly, flicker can be reduced.

[0044] Meanwhile, the driving control unit may control a plurality of light-emitting diodes in the first pixel group to be randomly and sequentially turned on during each sub-frame period within the first frame period when the grayscale of the first pixel group is lower than or equal to a reference value during the first frame period, and may control a plurality of light-emitting diodes in the first pixel group to be randomly and sequentially turned on during each sub-frame period within the second frame period when the grayscale of the first pixel group is lower than or equal to the reference value during the second frame period, and may control a light-emitting diode turned on in the first pixel group during the first sub-frame period within the second frame period to be different from a light-emitting diode turned on in the first pixel group during the first sub-frame period within the first frame period. Accordingly, flicker can be reduced at low grayscales.

[0045] According to another embodiment of the present disclosure, an image 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 and outputs a data signal for image display, wherein the driving control unit controls the plurality of light-emitting diodes in the first pixel group to be randomly turned on during each sub-frame period within the first frame period and the second frame period when the grayscale of the first pixel group is lower than or equal to a reference value during a first frame period and a second frame period, and controls the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the second frame period to be different from the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the first frame period. Accordingly, flicker can be reduced.

[0046] 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 and outputs a data signal for image display, wherein the driving control unit controls the plurality of light-emitting diodes in a first pixel group to be sequentially turned on based on first frame data during a first frame period, and controls the plurality of light-emitting diodes in the first pixel group to be sequentially turned on during a second frame period after the first frame period when the second frame data is the same as the first frame data, and controls the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the second frame period to be different from the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the first frame period. Accordingly, flicker can be reduced.

[0047] According to another embodiment of the present disclosure, a video wall 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 outputs a data signal for image display, wherein the driving control unit controls the plurality of light-emitting diodes in the first pixel group to be randomly turned on during each sub-frame period within the first frame period and the second frame period when the grayscale of the first pixel group is lower than or equal to a reference value during a first frame period and a second frame period, and controls the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the second frame period to be different from the light-emitting diodes turned on in the first pixel group during the first sub-frame period within the first frame period. Accordingly, flicker can be reduced.

[0048] FIG. 1 is a diagram illustrating a video wall according to one embodiment of the present disclosure.

[0049] Figure 2 is an example of an internal block diagram of the video wall of Figure 1.

[0050] Figure 3 is an example of an internal block diagram of the signal processing device of Figure 2.

[0051] Figure 4 is an internal block diagram of the display of Figure 2.

[0052] FIGS. 5A to 5C are drawings for reference in the description of the light-emitting panel of FIG. 4.

[0053] Fig. 6 is a drawing illustrating an example of the light-emitting panel of Fig. 4.

[0054] FIGS. 7A to 9C are drawings for reference in explaining the operation of a video display device related to the present disclosure.

[0055] FIG. 10 is a diagram showing the operation of a video display device according to one embodiment of the present disclosure.

[0056] Figures 11a to 14 are drawings referenced in the description of Figure 15.

[0057] Hereinafter, the present disclosure will be described in more detail with reference to the drawings.

[0058] 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.

[0059] FIG. 1 is a diagram illustrating a video wall according to one embodiment of the present disclosure.

[0060] 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).

[0061] 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.

[0062] For example, the video wall (10) can receive a video signal from a set-top box (not shown) through an HDMI terminal.

[0063] As another example, the video wall (10) can receive a video signal from a server (not shown) through a network terminal.

[0064] Meanwhile, the video wall (10) can be installed inside or outside the building.

[0065] 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.

[0066] As another example, the video wall (10) can be installed and placed on a wall inside a house.

[0067] Such a video wall (10) may be equipped with a plurality of displays (180a to 180d) that are arranged adjacently.

[0068] 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.

[0069] In this disclosure, a plurality of displays (180a to 180d) are described with a focus on having inorganic light-emitting panels (LED panels).

[0070] Meanwhile, the inorganic light-emitting panel (LED panel) contains light-emitting diodes and has the advantages of excellent response speed and color reproduction.

[0071] 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).

[0072] 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).

[0073] 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.

[0074] 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.

[0075] 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).

[0076] 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.

[0077] Meanwhile, when a plurality of displays (180a to 180d) are driven based on a passive matrix method, inorganic light-emitting panels including light-emitting diodes, the light-emitting diodes are made to emit light or not emit light by using a plurality of sub-frames.

[0078] Meanwhile, when a light-emitting diode operates based on a pulse width-based data signal, there is a problem in that a flickering phenomenon occurs when the off period is greater than the on period within a frame period.

[0079] In this disclosure, a method for reducing flicker is proposed. This is described in detail with reference to FIG. 10 and below.

[0080] Figure 2 is an example of an internal block diagram of the video wall of Figure 1.

[0081] Referring to the drawing, the video wall (10) may be equipped with first to fourth video display devices (100a to 100d).

[0082] 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.

[0083] 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.

[0084] 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).

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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).

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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).

[0093] For example, the signal processing device (170) can crop an input image into multiple images and perform scaling.

[0094] 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).

[0095] 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).

[0096] 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).

[0097] Meanwhile, at least one signal processing device may be provided to control multiple displays (180a to 180d).

[0098] 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).

[0099] A plurality of signal processing devices (170 to 170d) can perform control operations for displaying images on a plurality of displays (180a to 180d).

[0100] 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).

[0101] 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.

[0102] The power supply unit (190) can supply power required for the operation of each component by receiving external power or internal power.

[0103] 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.

[0104] The temperature sensing unit (not shown) can sense the temperature of the video wall (10).

[0105] 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.

[0106] 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).

[0107] 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).

[0108] 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).

[0109] 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.

[0110] 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).

[0111] 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.

[0112] The demodulation unit (120) receives the digital IF signal (DIF) converted from the tuner unit (110) and performs a demodulation operation.

[0113] 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.

[0114] 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).

[0115] 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).

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] Meanwhile, the network interface unit (135) may include a wireless communication unit (not shown).

[0121] 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.

[0122] 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.

[0123] 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).

[0124] 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.

[0125] 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).

[0126] 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.

[0127] 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.

[0128] 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).

[0129] 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).

[0130] 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.

[0131] 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.

[0132] 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).

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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).

[0137] Meanwhile, the display (180) is configured as a touch screen and can be used as an input device in addition to an output device.

[0138] The audio output unit (185) receives a signal processed by the signal processing device (170) and outputs it as voice.

[0139] 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).

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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).

[0144] Meanwhile, the above-described video display device (100) may be a digital broadcast receiver capable of receiving fixed or mobile digital broadcasts.

[0145] 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.

[0146] Figure 3 is an example of an internal block diagram of the signal processing device of Figure 2.

[0147] 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.

[0148] 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).

[0149] 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).

[0150] 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).

[0151] 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).

[0152] 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.

[0153] The scaler (335) can scale an input video signal that has been decoded by a video decoder (325), etc.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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).

[0159] 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.

[0160] 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.

[0161] In particular, the formatter (360) can change the format of the video signal to correspond to the display panel.

[0162] The processor (330) can control the overall operation within the image display device (100) or the signal processing device (170).

[0163] 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.

[0164] 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).

[0165] Additionally, the processor (330) can perform data transmission control with the network interface unit (135) or the external device interface unit (130).

[0166] 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).

[0167] 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.

[0168] Additionally, the audio processing unit (370) within the signal processing device (170) can process bass, treble, volume control, etc.

[0169] 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.

[0170] 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.

[0171] In particular, the frame image rate conversion unit (350) and the formatter (360) may be provided separately from the image processing unit (320).

[0172] Figure 4 is an internal block diagram of the display of Figure 2.

[0173] 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.

[0174] 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).

[0175] 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).

[0176] 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).

[0177] 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).

[0178] The timing controller (232) can output a data driving signal (Sda) and a gate driving signal (Sga) based on a video signal (Vd).

[0179] 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).

[0180] 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.

[0181] 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).

[0182] 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.

[0183] Meanwhile, the timing controller (232) can further output a control signal (Cs) to the gate driver (234).

[0184] 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.

[0185] 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.

[0186] Meanwhile, the gate line (GL) may also be called a scan line because a scan signal is input.

[0187] 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).

[0188] 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.

[0189] Meanwhile, the timing controller (232), gate driver (234), and data driver (236) in the drawing can be implemented as a single integrated circuit (IC).

[0190] Accordingly, the timing controller (232), gate driver (234), and data driver (236) may be named a drive control unit (285).

[0191] Meanwhile, the drive control unit (285) may include a buffer (238) that stores frame data.

[0192] In particular, the timing controller (232) in the driving control unit (285) can output a gate signal and a data signal for image display based on frame data stored in the buffer (238).

[0193] FIGS. 5A to 5C are drawings for reference in the description of the light-emitting panel of FIG. 4.

[0194] First, FIG. 5a is a drawing showing pixels within a light-emitting panel (210).

[0195] 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.

[0196] 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.

[0197] 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).

[0198] FIG. 5b illustrates the circuit of one subpixel within a pixel of the light-emitting panel of FIG. 5a.

[0199] 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.

[0200] 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.

[0201] Meanwhile, light-emitting diodes can emit light or not, based on multiple sub-frames based on a passive matrix method.

[0202] Figure 5c is a diagram showing examples of scan signals and data signals.

[0203] 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.

[0204] At this time, the width of the scan signal (Vscan) can be set to Wa.

[0205] 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.

[0206] 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.

[0207] 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).

[0208] (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).

[0209] 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.

[0210] Accordingly, it is possible to output a data signal corresponding to the light-emitting diode, and further perform uniform color implementation.

[0211] 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.

[0212] Fig. 6 is a drawing illustrating an example of the light-emitting panel of Fig. 4.

[0213] Referring to the drawing, the light-emitting panel (210) may have a plurality of data lines and a plurality of scan lines.

[0214] 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.

[0215] FIGS. 7A to 9C are drawings for reference in explaining the operation of a video display device related to the present disclosure.

[0216] 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.

[0217] Referring to the drawing, a plurality of sub-frame periods (Subframe 1 to 3) may be provided within a frame period (Frame 1).

[0218] 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.

[0219] (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).

[0220] 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.

[0221] At this time, the pulse width of the data signal (Vdata 1~4) can be Wx.

[0222] 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.

[0223] Accordingly, during the first subframe (Subframe 1) period, 16 light-emitting diodes emit light, as shown in (c) of Fig. 7a.

[0224] 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.

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] In the drawing, during the third subframe (Subframe 3), data signals (Vdata 1 to 4) each having one pulse or voltage (Vx) on four data lines are illustrated.

[0230] 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.

[0231] Accordingly, during the third subframe (Subframe 3) period, four light-emitting diodes in the diagonal direction emit light, as shown in (c) of Fig. 7a.

[0232] 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.

[0233] (a) of FIG. 7b 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).

[0234] 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.

[0235] At this time, the pulse width of the data signal (Vdata 1~4) can be Wx.

[0236] (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).

[0237] Accordingly, during the first subframe (Subframe 1) period, 16 light-emitting diodes emit light, as shown in (c) of Fig. 7b.

[0238] Meanwhile, (a) of FIG. 7b illustrates that during the second subframe (Subframe 2) period among multiple subframe periods (Subframe 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 third subframe (Subframe 3) period, no pulse or voltage (Vx) is applied.

[0239] Accordingly, during the second subframe (Subframe 2) period, four light-emitting diodes in the diagonal direction, as shown in (c) of Fig. 7b, emit light, and during the third subframe (Subframe 3) period, all 16 light-emitting diodes are turned off and do not emit light.

[0240] As shown in Fig. 7b, if 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 may occur.

[0241] FIG. 7c illustrates an example of a data signal applied in response to a case where the frame grayscale is a third grayscale lower than the second grayscale during a plurality of sub-frame periods within a frame period.

[0242] (a) of FIG. 7c 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.

[0243] Figure 7c (b) 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).

[0244] Accordingly, during the first subframe (Subframe 1) period, four light-emitting diodes in the diagonal direction, as shown in (c) of Fig. 7c, 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.

[0245] As shown in Fig. 7c, 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 may occur.

[0246] In particular, in the case of Fig. 7c, the diode non-emission period becomes longer than in Fig. 7b, so the possibility of flicker occurrence increases.

[0247] FIG. 8a illustrates an example of a subframe driving method related to the present disclosure.

[0248] Referring to the drawing, the input grayscale can be varied in steps from 1 to 39.

[0249] In order to express the input grayscale, according to the driving method of the passive matrix, a data signal is output during a plurality of sub-frame periods.

[0250] The driving control unit (285) can output a first data signal (D1x) including an offset signal (OFx) and a first weighted signal (W1x) during the first subframe period (Subframe 1) when the input gray level is 1.

[0251] Meanwhile, the offset signal (OFx) may include multiple step-up signals (Rx) and multiple sustain signals (Sx).

[0252] At this time, the plurality of step-up signals (Rx) may include seven step-up signals that increase stepwise, and the plurality of sustain signals (Sx) may include seven basic weighted signals (Ux) of a certain level.

[0253] Meanwhile, the first weighted signal (W1x) may include one basic weighted signal (Ux).

[0254] That is, the first data signal (D1x) may include seven step-up signals that increase stepwise and eight basic weighted signals (Ux).

[0255] Meanwhile, the driving control unit (285) can output a second data signal (D2x) including an offset signal (OFx) and a second weighted signal (W2x) during the first subframe period (Subframe 1) when the input gray level is 2.

[0256] That is, the second data signal (D2x) may include one more basic weighted signal (Ux) than the first data signal (D1x).

[0257] Meanwhile, the driving control unit (285) can output a second data signal (D12x) including an offset signal (OFx) and a 12th weighted signal (W12x) during the first subframe period (Subframe 1) when the input gray level is 12.

[0258] The 12th weighted signal (W12x) at this time may include 12 basic weighted signals (Ux).

[0259] Meanwhile, the driving control unit (285) can output a data signal (D13xa) including an offset signal (OFx) and a 12th weighting signal (W12x) during the first subframe period (Subframe 1) when the input grayscale is 13, and can output a data signal (D13xb) including an offset signal (OFx) and one basic weighting signal (Ux) during the second subframe period (Subframe 2).

[0260] Comparing the case where the input grayscale is 12 and the case where it is 13, a data signal (D13xb) including an offset signal (OFx) and one basic weighting signal (Ux) is output more.

[0261] Meanwhile, the driving control unit (285) can output a data signal (D24xa) including an offset signal (OFx) and a 12th weighted signal (W12x) during the first subframe period (Subframe 1) when the input grayscale is 24, and can output a data signal (D24xb) including an offset signal (OFx) and a 12th weighted signal (W12x) during the second subframe period (Subframe 2).

[0262] Meanwhile, the driving control unit (285) can output a data signal (D25xa) including an offset signal (OFx) and a twelfth weighted signal (W12x) during a first sub-frame period (Subframe 1), output a data signal (D25xb) including an offset signal (OFx) and a twelfth weighted signal (W12x) during a second sub-frame period (Subframe 2), and output a data signal (D25xc) including an offset signal (OFx) and one basic weighted signal (Ux) during a third sub-frame period (Subframe 3).

[0263] Comparing the case where the input grayscale is 24 and the case where it is 25, an additional data signal (D25xc) including an offset signal (OFx) and one basic weighting signal (Ux) is output.

[0264] Meanwhile, the driving control unit (285) can output a data signal (D36xa) including an offset signal (OFx) and a 12th weighted signal (W12x) during a first sub-frame period (Subframe 1), a data signal (D36xb) including an offset signal (OFx) and a 12th weighted signal (W12x) during a second sub-frame period (Subframe 2), and a data signal (D36xc) including an offset signal (OFx) and a 12th weighted signal (W12x) during a third sub-frame period (Subframe 3), when the input grayscale is 36.

[0265] Meanwhile, the driving control unit (285) can output, when the input grayscale is 37, a data signal (D37xa) including an offset signal (OFx) and a twelfth weighted signal (W12x) during a first sub-frame period (Subframe 1), a data signal (D37xb) including an offset signal (OFx) and a twelfth weighted signal (W12x) during a second sub-frame period (Subframe 2), a data signal (D37xc) including an offset signal (OFx) and a twelfth weighted signal (W12x) during a third sub-frame period (Subframe 3), and a data signal (D37xd) including an offset signal (OFx) and one basic weighted signal (Ux) during a fourth sub-frame period (Subframe 4).

[0266] Comparing the case where the input grayscale is 36 and the case where it is 37, a data signal (D37xd) including an offset signal (OFx) and one basic weighting signal (Ux) is output more.

[0267] According to the method of FIG. 8a, as the number of subframes increases, an offset signal (OFx) and one basic weight signal (Ux) of data signals are additionally applied.

[0268] For example, when the luminance by the offset signal (OFx) is approximately 0.5 nits and the luminance by one basic weighting signal (Ux) is 0.04 nits, a change of 0.54 nits may occur instead of a change of 0.04 nits whenever the number of subframes changes.

[0269] FIG. 8b illustrates another example of a subframe driving method related to the present disclosure.

[0270] Referring to the drawing, the input grayscale can be varied in steps from 1 to 39.

[0271] In order to express the input grayscale, according to the driving method of the passive matrix, a data signal is output during a plurality of sub-frame periods.

[0272] The driving control unit (285) can output a first data signal (D1y) including an offset signal (OFy) and a first weighted signal (W1y) during the first subframe period (Subframe 1) when the input gray level is 1.

[0273] Meanwhile, the offset signal (OFy) may include multiple step-up signals (Ry) and multiple sustain signals (Sy).

[0274] At this time, the plurality of step-up signals (Ry) may include seven step-up signals that increase stepwise, and the plurality of sustain signals (Sy) may include seven basic weighted signals (Uy) of a certain level.

[0275] Meanwhile, the first weighted signal (W1y) may include one basic weighted signal (Uy).

[0276] That is, the first data signal (D1y) may include seven step-up signals that increase stepwise and eight basic weighted signals (Uy).

[0277] Meanwhile, the driving control unit (285) can output a second data signal (D2y) including an offset signal (OFy) and a second weighted signal (W2y) during the first subframe period (Subframe 1) when the input gray level is 2.

[0278] That is, the second data signal (D2y) may include one more basic weighted signal (Uy) than the first data signal (D1y).

[0279] Meanwhile, the driving control unit (285) can output a 23rd data signal (D23y) including an offset signal (OFy) and a 23rd weighted signal (W23y) during the first subframe period (Subframe 1) when the input gray level is 23.

[0280] The 23rd weighted signal (W12y) at this time may include 23 basic weighted signals (Uy).

[0281] Meanwhile, the driving control unit (285) can output a data signal (D24ya) including an offset signal (OFy) and a 12th weighted signal (W12y) during the first sub-frame period (Subframe 1) when the input gray level is 24, and can output a data signal (D24xb) including an offset signal (OFy) and a 12th weighted signal (W12y) during the second sub-frame period (Subframe 2).

[0282] At this time, the 12th weighted signal (W12y) may include 12 basic weighted signals (Uy).

[0283] Comparing the case where the input gray level is 23 and 24, an offset signal (OFy) and one more basic weighting signal (Uy) are output.

[0284] Meanwhile, the driving control unit (285) can output a data signal (D25ya) including an offset signal (OFy) and a 13th weighted signal (W12y) during the first sub-frame period (Subframe 1) when the input grayscale is 25, and can output a data signal (D25yb) including an offset signal (OFy) and a 12th weighted signal (W12y) during the second sub-frame period (Subframe 2).

[0285] Meanwhile, the driving control unit (285) can output a data signal (D35ya) including an offset signal (OFy) and an 18th weighted signal (W18y) during the first sub-frame period (Subframe 1) when the input grayscale is 35, and can output a data signal (D35yb) including an offset signal (OFy) and a 17th weighted signal (W17y) during the second sub-frame period (Subframe 2).

[0286] At this time, the 18th weighted signal (W18y) may include 18 basic weighted signals (Uy), and the 17th weighted signal (W17y) may include 17 basic weighted signals (Uy).

[0287] Meanwhile, the driving control unit (285) can output a data signal (D36ya) including an offset signal (OFy) and a twelfth weighted signal (W18y) during a first sub-frame period (Subframe 1), output a data signal (D35yb) including an offset signal (OFy) and a twelfth weighted signal (W12y) during a second sub-frame period (Subframe 2), and output a data signal (D36yc) including an offset signal (OFy) and a twelfth weighted signal (W12y) during a third sub-frame period (Subframe 3).

[0288] Comparing the cases where the input grayscale is 35 and 36, an offset signal (OFy) and one more basic weighting signal (Uy) are output.

[0289] According to the method of Fig. 8b, as the number of subframes increases, an offset signal (OFy) and one data signal equal to the basic weighting signal (Uy) are additionally applied.

[0290] For example, when the luminance by the offset signal (OFy) is approximately 0.5 nits and the luminance by one basic weighting signal (Uy) is 0.04 nits, a change of 0.54 nits may occur instead of a change of 0.04 nits whenever the number of subframes changes.

[0291] Fig. 9a is an example of a drive control unit related to the present disclosure.

[0292] Referring to the drawing, the driving control unit (285x) related to the present disclosure may include a fixed sub-frame mapping unit (237x) that performs fixed sub-frame mapping based on frame data among image data from a signal processing device (170), and a timing controller (232).

[0293] The fixed sub-frame mapping unit (237x) can distribute grayscale to a predetermined sub-frame based on the grayscale of the frame data.

[0294] For example, the fixed sub-frame mapping unit (237x) can distribute the grayscale to a given sub-frame, as in FIG. 8a or FIG. 8b, according to the grayscale of the frame data.

[0295] Figures 9b to 9c are drawings referenced in the description of Figure 9a.

[0296] Figure 9b is a diagram illustrating the operation of the fixed sub-frame mapping unit in the case of the first tone.

[0297] Referring to the drawing, when a pixel group (PXa1) has a plurality of light-emitting diodes (a to i) and a first grayscale is allocated during a first frame period (1FR), the fixed sub-frame mapping unit (237x) can perform grayscale mapping so that the plurality of light-emitting diodes (a to i) emit light only during the first sub-frame period (SF0) among the plurality of sub-frame periods (SF0 to SF3), as shown in the drawing.

[0298] That is, when the first grayscale is allocated during the first frame period (1FR), the plurality of light-emitting diodes (a to i) can be turned off during the second to fourth sub-frame periods (SF1 to SF3) among the plurality of sub-frame periods (SF0 to SF3).

[0299] Meanwhile, when the first grayscale is allocated during the second frame period (2FR) following the first frame period (1FR), as shown in the drawing, the plurality of light-emitting diodes (a to i) can emit light only during the first sub-frame period (SF0) among the plurality of sub-frame periods (SF0 to SF3).

[0300] As shown in Fig. 9b, since the plurality of light-emitting diodes (a to i) emit light only during the first sub-frame period (SF0) among the plurality of sub-frame periods (SF0 to SF3), the flicker phenomenon becomes severe.

[0301] Figure 9c is a drawing illustrating the operation of a fixed sub-frame mapping unit in the case of a second tone higher than the first tone.

[0302] Referring to the drawing, when a pixel group (PYa) has a plurality of light-emitting diodes (a to i) and a second grayscale is allocated during the first frame period (1FR), the fixed sub-frame mapping unit (237x) can perform grayscale mapping so that the plurality of light-emitting diodes (a to i) emit light only during the first sub-frame period (SF0) and the third sub-frame period (SF2) among the plurality of sub-frame periods (SF0 to SF3), as shown in the drawing.

[0303] That is, when the second grayscale is allocated during the first frame period (1FR), the plurality of light-emitting diodes (a to i) can be turned off during the second sub-frame period (SF1) and the fourth sub-frame period (SF3) among the plurality of sub-frame periods (SF0 to SF3).

[0304] Meanwhile, when the second grayscale is allocated during the second frame period (2FR) following the first frame period (1FR), as shown in the drawing, the plurality of light-emitting diodes (a to i) can emit light only during the first sub-frame period (SF0) and the third sub-frame period (SF2) among the plurality of sub-frame periods (SF0 to SF3).

[0305] As shown in Fig. 9b, among the multiple sub-frame periods (SF0 to SF3), the multiple light-emitting diodes (a to i) emit light only during the first sub-frame period (SF0) and the third sub-frame period (SF2), so a flickering phenomenon may occur.

[0306] Accordingly, this disclosure proposes a method for eliminating the flicker phenomenon. This is described with reference to FIG. 10 and below.

[0307] FIG. 10 is a diagram showing the operation of a video display device according to one embodiment of the present disclosure.

[0308] Referring to the drawing, the driving control unit (285) controls a plurality of light-emitting diodes (a to i) within the first pixel group (PXm) to be sequentially turned on based on the first frame data during the first frame period (1FR) (S1010).

[0309] Accordingly, during the first frame period (1FR), multiple light-emitting diodes (a to i) are sequentially turned on, thereby reducing flicker.

[0310] Next, the driving control unit (285) determines whether the second frame data is identical to the first frame data during the second frame period (2FR) following the first frame period (1FR) (S1020), and if so, controls the plurality of light-emitting diodes (a to i) within the first pixel group (PXm) to be sequentially turned on during the second frame period (2FR).

[0311] Accordingly, during the second frame period (2FR), multiple light-emitting diodes (a to i) are sequentially turned on, thereby reducing flicker.

[0312] In particular, the driving control unit (285) controls the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the second frame period (2FR) after the first frame period (1FR) so that, when the second frame data is the same as the first frame data, the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the first frame period (1FR) is different from the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the first frame period (1FR) (S1030).

[0313] Accordingly, the possibility of occurrence of a licker can be reduced during the second frame period (2FR) following the first frame period (1FR).

[0314] Meanwhile, the driving control unit (285) can control the light-emitting diodes to be turned on differently during each sub-frame period (SF0 to SF3) within the first frame period (1FR) based on the first frame data.

[0315] For example, the driving control unit (285) can control the turn-on diode in the first pixel group (PXm) to be different during each sub-frame period (SF0 to SF3) within the first frame period (1FR) based on the first frame data. Accordingly, flicker can be reduced.

[0316] Meanwhile, the driving control unit (285) can control the light-emitting diodes to be turned on differently during each sub-frame period (SF0 to SF3) within the second frame period (2FR) based on the second frame data.

[0317] For example, the driving control unit (285) can control the turn-on diode in the first pixel group (PXm) to be different during each sub-frame period (SF0 to SF3) within the second frame period (2FR) based on the second frame data. Accordingly, flicker can be reduced.

[0318] Meanwhile, the driving control unit (285) can control the light-emitting diodes to be turned on differently during each sub-frame period (SF0 to SF3) within the first frame period (1FR) and each sub-frame period (SF0 to SF3) within the second frame period (2FR) when the second frame data is the same as the first frame data during the second frame period (2FR).

[0319] For example, the driving control unit (285) can control the light-emitting diodes to be turned on differently in each of the sub-frame periods (SF0 to SF3) within the first frame period (1FR) and in each of the sub-frame periods (SF0 to SF3) within the second frame period (2FR) when the second frame data is the same as the first frame data during the second frame period (2FR).

[0320] Furthermore, the driving control unit (285) can control the light-emitting diodes to be turned on differently during each sub-frame period (SF0 to SF3) within the first frame period (1FR) and each sub-frame period (SF0 to SF3) within the second frame period (2FR), when the second frame data is the same as the first frame data during the second frame period (2FR). Accordingly, flicker can be reduced.

[0321] Meanwhile, the operating method of Fig. 10 can also be performed only when the grayscale of the first pixel group (PXm) is below a reference value.

[0322] That is, the driving control unit (285) can control a plurality of light-emitting diodes (a to i) within the first pixel group (PXm) to be sequentially turned on when the grayscale of the first pixel group (PXm) is below a reference value during the first frame period (1FR), and can control a plurality of light-emitting diodes (a to i) within the first pixel group (PXm) to be sequentially turned on when the grayscale of the first pixel group (PXm) is below a reference value during the second frame period (2FR).

[0323] At this time, the driving control unit (285) can control the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the second frame period (2FR) to be different from the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the first frame period (1FR). Accordingly, flicker can be reduced at low gray levels.

[0324] Meanwhile, the driving control unit (285) can control a plurality of light-emitting diodes (a to i) within the second pixel group to be sequentially turned on when the grayscale of the second pixel group, which is different from the first pixel group (PXm), exceeds a reference value during the first frame period (1FR).

[0325] In addition, the driving control unit (285) can control a plurality of light-emitting diodes (a to i) within the second pixel group to be sequentially turned on when the grayscale of the second pixel group exceeds the reference value during the second frame period (2FR).

[0326] At this time, the driving control unit (285) can control the light emitting diodes that are turned on in the second pixel group during each sub-frame period (SF0 to SF3) within the second frame period (2FR) to be partially overlapped with the light emitting diodes that are turned on in the second pixel group during each sub-frame period (SF0 to SF3) within the first frame period (1FR).

[0327] Meanwhile, the driving control unit (285) can vary the reference value based on the illuminance around the panel (210).

[0328] Meanwhile, as the illumination around the panel (210) increases, the flicker phenomenon in which the image flickers may become more severe.

[0329] That is, the driving control unit (285) can increase the reference value as the illumination around the panel (210) increases.

[0330] For example, when the ambient illuminance around the panel (210) is at a second level that is greater than the first level, the driving control unit (285) can increase the reference value to control the number of light-emitting diodes sequentially turned on in the first pixel group (PXm) to increase further. Accordingly, flicker can be reduced in response to the ambient illuminance.

[0331] Meanwhile, the driving control unit (285) can vary the frame rate based on the illumination around the panel (210).

[0332] That is, the driving control unit (285) can control the frame rate to decrease as the illumination around the panel (210) increases.

[0333] For example, when the ambient illuminance around the panel (210) is at a second level that is greater than the first level, the driving control unit (285) can control the light-emitting diodes within the first pixel group (PXm) to be sequentially turned on during each sub-frame period within the first frame period (1FR) by lowering the frame rate. Accordingly, flicker can be reduced in response to the ambient illuminance.

[0334] Figure 11a is a flowchart explaining pixel grouping.

[0335] Referring to the drawing, the driving control unit (285) can perform pixel grouping based on the average brightness level of the image (S1055).

[0336] For example, the driving control unit (285) can vary the size of a pixel group or vary the number of light-emitting diodes included in a pixel group based on the average brightness level of the image.

[0337] Next, the driving control unit (285) can perform sub-frame mapping based on the size of the set pixel group or the light-emitting diodes included in the pixel group (S1062).

[0338] Figure 11b illustrates an example of the size of a pixel group.

[0339] Referring to the drawing, the driving control unit (285) can set the first pixel group (PYm) to a first size so that the first pixel group (PYm) includes a first number of light-emitting diodes when the average brightness level of the first frame period (1FR) and the average brightness level of the second frame period (2FR) are equal to or lower than a first predetermined value.

[0340] In the drawing, it is illustrated that nine light-emitting diodes (a~i) of 3*3 are included within the first pixel group (PYm).

[0341] Figure 11c illustrates another example of the size of a pixel group.

[0342] Meanwhile, the driving control unit (285) may set the first pixel group (PXmb) to a second size smaller than the first size when the average brightness level of the first frame period (1FR) and the average brightness level of the second frame period (2FR) exceed the first predetermined value, so that the first pixel group (PXmb) may include a second number of light-emitting diodes smaller than the first number.

[0343] In the drawing, it is illustrated that four light-emitting diodes (a to d) of 2*2 are included within the first pixel group (PXmb).

[0344] In this way, flicker can be adaptively reduced by varying the size of pixel groups, etc. based on the average brightness level.

[0345] FIG. 12a is an example of an internal block diagram of a drive control unit according to an embodiment of the present disclosure.

[0346] Referring to the drawing, the driving control unit (285) according to the embodiment of the present disclosure may include a variable sub-frame mapping unit (237) that performs variable sub-frame mapping based on frame data among image data from a signal processing device (170), and a timing controller (232).

[0347] The variable sub-frame mapping unit (237) can distribute the grayscale to the variable sub-frame based on the grayscale of the frame data.

[0348] For example, the variable sub-frame mapping unit (237) can distribute the grayscale during each sub-frame period (SF0 to SF3) when the grayscale of the frame data is below a reference value.

[0349] Meanwhile, the timing controller (232) can control the gate signal and data signal to be output respectively according to the grayscale assigned in the variable sub-frame mapping unit (237).

[0350] Figure 12b is a drawing referenced in the description of Figure 12a.

[0351] Referring to the drawing, the variable sub-frame mapping unit (237) within the driving control unit (285) can control the driving control unit (285) to turn on a plurality of light-emitting diodes (a to i) within the first pixel group (PXm) randomly and sequentially during each sub-frame period (SF0 to SF3) within the first frame period (1FR) when the grayscale of the first pixel group (PXm) is below a reference value during the first frame period (1FR).

[0352] In particular, the variable sub-frame mapping unit (237) within the driving control unit (285) can allocate 2 tones to the first sub-frame period (SF0), 2 tones to the second sub-frame period (SF1), 2 tones to the third sub-frame period (SF2), and 3 tones to the fourth sub-frame period (SF3) when the grayscale of the first pixel group (PXm) is 9 and less than or equal to the reference value of 30.

[0353] In the drawing, it is exemplified that the a light-emitting diode and the h light-emitting diode within the first pixel group (PXm) are turned on in the first sub-frame period (SF0), the b light-emitting diode and the f light-emitting diode within the first pixel group (PXm) are turned on in the second sub-frame period (SF1), the d light-emitting diode and the i light-emitting diode within the first pixel group (PXm) are turned on in the third sub-frame period (SF2), and the c light-emitting diode, the e light-emitting diode, and the g light-emitting diode within the first pixel group (PXm) are turned on in the fourth sub-frame period (SF3).

[0354] Meanwhile, the driving control unit (285) can control a plurality of light-emitting diodes (a to i) within the first pixel group (PXm) to be randomly and sequentially turned on during each sub-frame period (SF0 to SF3) within the second frame period (2FR) when the grayscale of the first pixel group (PXm) is below a reference value during the second frame period (2FR).

[0355] Meanwhile, the driving control unit (285) can control the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the second frame period (2FR) to be different from the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the first frame period (1FR). Accordingly, flicker can be reduced at low gray levels.

[0356] In the drawing, it is exemplified that the a light-emitting diode and the h light-emitting diode within the first pixel group (PXm) are turned on in the first sub-frame period (SF0) within the first frame period (1FR), and the f light-emitting diode and the g light-emitting diode within the first pixel group (PXm) are turned on in the first sub-frame period (SF0) within the second frame period (2FR). Accordingly, flicker can be reduced at low gray levels.

[0357] Meanwhile, the driving control unit (285) according to another embodiment of the present disclosure controls a plurality of light-emitting diodes (a to i) in the first pixel group (PXm) to be randomly turned on during each sub-frame period (SF0 to SF3) within the first frame period (1FR) and the second frame period (2FR) after the first frame period (1FR) and the second frame period (2FR), when the grayscale of the first pixel group (PXm) is lower than or equal to a reference value.

[0358] Meanwhile, the driving control unit (285) according to the embodiment of the present disclosure controls the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the second frame period (2FR) to be different from the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the first frame period (1FR). Accordingly, flicker can be reduced.

[0359] Figure 12c is a drawing referenced in the description of Figure 12a.

[0360] Referring to the drawing, the variable sub-frame mapping unit (237) within the driving control unit (285) can allocate 4 tones to the first sub-frame period (SF0), 4 tones to the second sub-frame period (SF1), 4 tones to the third sub-frame period (SF2), and 34 to the fourth sub-frame period (SF3) when the grayscale of the first pixel group (PXn) is 18 and less than or equal to the reference value of 30.

[0361] In the drawing, it is illustrated that in a first sub-frame period (SF0), the a, c, e, h light-emitting diodes in the first pixel group (PXn) are turned on, in a second sub-frame period (SF1), the b, d, f, g, h light-emitting diodes in the first pixel group (PXn) are turned on, in a third sub-frame period (SF2), the a, b, d, f, i light-emitting diodes in the first pixel group (PXn) are turned on, and in a fourth sub-frame period (SF3), the c, e, g, i light-emitting diodes in the first pixel group (PXn) are turned on.

[0362] Meanwhile, the driving control unit (285) can control a plurality of light-emitting diodes (a to i) within the first pixel group (PXn) to be turned on randomly and sequentially during each sub-frame period (SF0 to SF3) within the second frame period (2FR) when the grayscale of the first pixel group (PXn) is below a reference value during the second frame period (2FR).

[0363] In the drawing, it is exemplified that the a, c, e, and h light-emitting diodes within the first pixel group (PXn) are turned on in the first sub-frame period (SF0) within the first frame period (1FR), and the f light-emitting diode and the g light-emitting diode within the first pixel group (PXn) are turned on in the first sub-frame period (SF0) within the second frame period (2FR). Accordingly, flicker can be reduced at low gray levels.

[0364] Figure 13a is a drawing illustrating the same grayscale in the first frame period and the second frame period.

[0365] Referring to the drawing, the grayscale of the first pixel group (PXm) may be 9 during the first frame period (1FR), and the grayscale of the first pixel group (PXm) may be 9 during the second frame period (2FR).

[0366] Meanwhile, the driving control unit (285) can control a plurality of light-emitting diodes (a to i) within the first pixel group (PXm) to be sequentially turned on when the grayscale of the first pixel group (PXm) is below a reference value during the first frame period (1FR).

[0367] Meanwhile, the driving control unit (285) can control a plurality of light-emitting diodes (a to i) within the first pixel group (PXm) to be sequentially turned on when the grayscale of the first pixel group (PXm) is below a reference value during the second frame period (2FR).

[0368] Meanwhile, the driving control unit (285) can control the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the second frame period (2FR) to be different from the light emitting diode turned on in the first pixel group (PXm) during the first sub-frame period (SF0) within the first frame period (1FR).

[0369] In the drawing, during the first frame period (1FR), the a and h light-emitting diodes in the first pixel group (PXm) are turned on in the first sub-frame period (SF0), the b and f light-emitting diodes in the first pixel group (PXm) are turned on in the second sub-frame period (SF1), the d and i light-emitting diodes in the first pixel group (PXm) are turned on in the third sub-frame period (SF2), and the c, e, and g light-emitting diodes in the first pixel group (PXm) are turned on in the fourth sub-frame period (SF3).

[0370] Meanwhile, during the second frame period (2FR), the f and g light-emitting diodes in the first pixel group (PXm) are turned on in the first sub-frame period (SF0), the e and h light-emitting diodes in the first pixel group (PXm) are turned on in the second sub-frame period (SF1), the a and i light-emitting diodes in the first pixel group (PXm) are turned on in the third sub-frame period (SF2), and the b, c, and d light-emitting diodes in the first pixel group (PXm) are turned on in the fourth sub-frame period (SF3).

[0371] Meanwhile, during the third frame period (3FR), the d, i light-emitting diodes in the first pixel group (PXm) are turned on in the first sub-frame period (SF0). Accordingly, flicker can be reduced at low gray levels.

[0372] Figure 13b is a drawing illustrating different grayscale levels in the first frame period and the second frame period.

[0373] Referring to the drawing, the grayscale of the first pixel group (PXn) during the first frame period (1FR) may be 9, and the grayscale of the first pixel group (PXn) during the second frame period (2FR) may be 18.

[0374] Meanwhile, the driving control unit (285) may control a plurality of light-emitting diodes (a to i) in the first pixel group (PXn) to be sequentially turned on based on the first frame data during the first frame period (1FR), and may control a plurality of light-emitting diodes (a to i) in the first pixel group (PXn) to be sequentially turned on during the second frame period (2FR) after the first frame period (1FR) when the second frame data is different from the first frame data.

[0375] Meanwhile, the light emitting diode turned on in the first pixel group (PXn) during the first sub-frame period (SF0) within the second frame period (2FR) can be controlled to be different from the light emitting diode turned on in the first pixel group (PXn) during the first sub-frame period (SF0) within the first frame period (1FR). Accordingly, flicker can be reduced.

[0376] In the drawing, during the first frame period (1FR), the a and h light-emitting diodes in the first pixel group (PXn) are turned on in the first sub-frame period (SF0), the b and f light-emitting diodes in the first pixel group (PXn) are turned on in the second sub-frame period (SF1), the d and i light-emitting diodes in the first pixel group (PXn) are turned on in the third sub-frame period (SF2), and the c, e, and g light-emitting diodes in the first pixel group (PXn) are turned on in the fourth sub-frame period (SF3).

[0377] Meanwhile, during the second frame period (2FR), the a, c, e, h light-emitting diodes in the first pixel group (PXn) are turned on in the first sub-frame period (SF0), the b, d, f, g, h light-emitting diodes in the first pixel group (PXn) are turned on in the second sub-frame period (SF1), the a, b, d, f, i light-emitting diodes in the first pixel group (PXn) are turned on in the third sub-frame period (SF2), and the c, e, g, i light-emitting diodes in the first pixel group (PXn) are turned on in the fourth sub-frame period (SF3).

[0378] Meanwhile, during the third frame period (3FR), the f and g light-emitting diodes in the first pixel group (PXn) are turned on in the first sub-frame period (SF0). Accordingly, flicker can be reduced at low gray levels.

[0379] Figure 14 is a diagram illustrating various examples of subframe mapping.

[0380] Referring to the drawing, (a) of FIG. 14 illustrates a frame period (T vsync) by vertical synchronization frequency.

[0381] Meanwhile, n sub-frame periods can be arranged within a frame period (Tvsync).

[0382] Meanwhile, the driving control unit (285) can allocate grayscale for each first sub-frame period (SGa, SGa2, SGa3) of each frame, as shown in (b) of Fig. 14. Accordingly, flicker can be reduced.

[0383] Meanwhile, the driving control unit (285) can reduce the frame rate, as shown in (c) of Fig. 14, and allocate grayscale for each first sub-frame period of each frame based on the reduced frame rate. Accordingly, flicker can be reduced.

[0384] In Fig. 14 (c), compared to Fig. 14 (a), the frame period (T vsync) is doubled, i.e., the frame rate is reduced.

[0385] Meanwhile, the driving control unit (285) can randomly allocate grayscale levels within the sub-frame periods (SGc, SGc2, SG3) for each frame, as shown in (d) of Fig. 14. Accordingly, flicker can be reduced.

[0386] 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 is included that outputs a scan signal for each of a plurality of sub-frame periods to the plurality of light-emitting diodes and outputs a data signal for image display; The above driving control unit, During the first frame period, a plurality of light-emitting diodes within the first pixel group are controlled to be sequentially turned on based on the first frame data, During a second frame period after the first frame period, if the second frame data is identical to the first frame data, the plurality of light-emitting diodes within the first pixel group are controlled to be sequentially turned on. An image display device that controls a light emitting diode that is turned on in the first pixel group during the first sub-frame period within the second frame period to be different from a light emitting diode that is turned on in the first pixel group during the first sub-frame period within the first frame period.

2. In paragraph 1, The above driving control unit, An image display device that controls light-emitting diodes to be turned on differently during each sub-frame period within the first frame period based on the first frame data.

3. In paragraph 1, The above driving control unit, An image display device that controls light-emitting diodes to be turned on differently during each sub-frame period within the second frame period based on the first frame data.

4. In paragraph 1, The above driving control unit, An image display device, wherein, during the second frame period, when the second frame data is identical to the first frame data, the light-emitting diodes are controlled to be turned on differently during each sub-frame period within the first frame period and each sub-frame period within the second frame period.

5. In paragraph 1, The above driving control unit, When the gradation of the first pixel group is below a reference value during the first frame period, a plurality of light-emitting diodes within the first pixel group are controlled to be sequentially turned on, When the gradation of the first pixel group is lower than or equal to the reference value during the second frame period, a plurality of light-emitting diodes within the first pixel group are controlled to be sequentially turned on. An image display device in which a light emitting diode turned on in the first pixel group during the first sub-frame period within the second frame period is controlled differently from a light emitting diode turned on in the first pixel group during the first sub-frame period within the first frame period.

6. In paragraph 5, The above driving control unit, When the gradation of the second pixel group, which is different from the first pixel group during the first frame period, exceeds the reference value, a plurality of light-emitting diodes within the second pixel group are controlled to be sequentially turned on, When the gradation of the second pixel group exceeds the reference value during the second frame period, a plurality of light-emitting diodes within the second pixel group are controlled to be sequentially turned on. An image display device in which a light emitting diode turned on in the second pixel group during each sub-frame period within the second frame period is controlled to partially overlap with a light emitting diode turned on in the second pixel group during each sub-frame period within the first frame period.

7. In paragraph 5, The above driving control unit, An image display device that varies the reference value based on the illuminance around the panel.

8. In paragraph 7, The above driving control unit, An image display device that increases the reference value as the illuminance around the panel increases.

9. In paragraph 1, The above driving control unit, A display device that varies the frame rate based on the illuminance around the panel.

10. In paragraph 9, The above driving control unit, A display device that controls the frame rate to decrease as the illumination around the panel increases.

11. In paragraph 1, The above driving control unit, An image display device, wherein, when the average brightness level of the first frame period and the average brightness level of the second frame period are equal to or lower than a first predetermined value, the first pixel group is set to a first size so as to include a first number of light-emitting diodes.

12. In paragraph 11, The above driving control unit, An image display device, wherein, when the average brightness level of the first frame period and the average brightness level of the second frame period exceed the first predetermined value, the first pixel group is set to a second size smaller than the first size, so that the first pixel group includes a second number of light-emitting diodes smaller than the first number.

13. In paragraph 1, The above driving control unit, An image display device that varies the size of the first pixel group or varies the number of light-emitting diodes included in the first pixel group based on the average brightness level of the first frame period or the second frame period.

14. In paragraph 1, The above driving control unit, During the first frame period, a plurality of light-emitting diodes within the first pixel group are controlled to be sequentially turned on based on the first frame data, During a second frame period after the first frame period, if the second frame data is different from the first frame data, the plurality of light-emitting diodes within the first pixel group are controlled to be sequentially turned on. An image display device in which a light emitting diode turned on in the first pixel group during the first sub-frame period within the second frame period is controlled differently from a light emitting diode turned on in the first pixel group during the first sub-frame period within the first frame period.

15. In paragraph 1, The above driving control unit, If the gradation of the first pixel group is below a reference value during the first frame period, a plurality of light-emitting diodes within the first pixel group are controlled to be turned on randomly and sequentially during each sub-frame period within the first frame period, If the gradation of the first pixel group is lower than or equal to the reference value during the second frame period, a plurality of light-emitting diodes within the first pixel group are controlled to be turned on randomly and sequentially during each sub-frame period within the second frame period. An image display device in which a light emitting diode turned on in the first pixel group during the first sub-frame period within the second frame period is controlled differently from a light emitting diode turned on in the first pixel group during the first sub-frame period within the first frame period.

16. A panel having a plurality of light-emitting diodes; A driving control unit is included that outputs a scan signal for each of a plurality of sub-frame periods to the plurality of light-emitting diodes and outputs a data signal for image display; The above driving control unit, During the first frame period and the second frame period following the second frame period, if the gradation of the first pixel group is lower than or equal to the reference value, a plurality of light-emitting diodes within the first pixel group are controlled to be randomly turned on during each sub-frame period within the first frame period and the second frame period. An image display device that controls a light emitting diode that is turned on in the first pixel group during the first sub-frame period within the second frame period to be different from a light emitting diode that is turned on in the first pixel group during the first sub-frame period within the first frame period.

17. Including 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 16.

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