Video display device and video wall having same

Abstract

The present disclosure relates to a video display device and a video wall having same. According to one embodiment of the present disclosure, the video display device comprises: a light-emitting diode; a first switching element connected to an anode of the light-emitting diode and performing switching; a second switching element connected to a cathode of the light-emitting diode; a third switching element disposed between the anode of the light-emitting diode and a ground terminal; and a driving control unit outputting a scan signal to the second switching element for each of a plurality of subframe periods and outputting a variable pulse width-based data signal of the first switching element. The driving control unit outputs a discharge control signal for turning on the third switching element after a turn-on period of the first switching element based on the data signal. Accordingly, power consumption can be reduced.

Description

Video display device and video wall equipped with the same

[0001] The present disclosure relates to an image display device and a video wall equipped with the same, and more specifically, to an image display device capable of reducing power consumption and a video wall equipped with the same.

[0002] A video display device is a device that displays an image by having a display.

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

[0004] Meanwhile, when 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 light-emitting diode panel-based image display device based on a passive matrix driving method, multiple subframes are used to light up or de-light up the light-emitting diodes.

[0006] Meanwhile, when a pulse width-variable data signal is applied to light a light-emitting diode, there is a problem in that unnecessary power is consumed after the light-emitting diode is illuminated due to the tail current based on the data signal.

[0007] The problem to be solved by the present disclosure is to provide a video display device capable of reducing power consumption and a video wall equipped with the same.

[0008] Another problem that the present disclosure aims to solve is to provide an image display device capable of reducing power consumption while improving low-gradation expression capabilities, and a video wall equipped with the same.

[0009] A video display device and a video wall equipped with the same according to an embodiment of the present disclosure for achieving the above-mentioned problem comprises a light-emitting diode, a first switching element connected to the anode of the light-emitting diode and performing switching, a second switching element connected to the cathode of the light-emitting diode, a third switching element disposed between the anode of the light-emitting diode and a ground terminal, and a driving control unit that outputs a scan signal to the second switching element for a plurality of sub-frame periods and outputs a data signal based on the pulse width variation of the first switching element, wherein the driving control unit outputs a discharge control signal to turn on the third switching element after the turn-on period of the first switching element based on the data signal.

[0010] An image display device and a video wall equipped with the same according to one embodiment of the present disclosure further include a fourth switching element connected to the anode of a light-emitting diode and supplying a buffer current based on a switching operation, and a driving control unit can output a discharge control signal to turn on a third switching element during the off period of the fourth switching element.

[0011] Meanwhile, the driving control unit can turn on the fourth switching element during the precharge period and turn off the fourth switching element during the display period.

[0012] Meanwhile, the driving control unit can control the second switching element to turn on during the first display period from the first point in time during the first precharge period, control the first switching element to turn on from the second point in time to the third point in time during the first display period, and control the third switching element to turn on from the third point in time to the fourth point in time during the first display period.

[0013] Meanwhile, the driving control unit can control the turn-on period of the third switching element to be smaller than the turn-on period of the first switching element during the first display period.

[0014] Meanwhile, the driving control unit can control the third switching element to turn off from the fourth point in time during the first display period.

[0015] Meanwhile, the driving control unit can set the turn-on period of the third switching element based on the clock signal.

[0016] Meanwhile, the driving control unit can set the turn-on period of the third switching element based on the capacitance of the light-emitting diode.

[0017] Meanwhile, the driving control unit can be set so that the turn-on period of the third switching element increases as the capacitance of the light-emitting diode increases.

[0018] Meanwhile, the driving control unit can be set so that when the capacitance of the light-emitting diode is a green light-emitting diode or a blue light-emitting diode is greater than the capacitance of the red light-emitting diode, the turn-on period of the third switching element of the green light-emitting diode or the blue light-emitting diode is greater than the turn-on period of the third switching element of the red light-emitting diode.

[0019] Meanwhile, the driving control unit can be set so that when the capacitance of the light-emitting diode increases in the order of the red light-emitting diode, green light-emitting diode, and blue light-emitting diode, the turn-on period of the third switching element increases in the order of the red light-emitting diode, green light-emitting diode, and blue light-emitting diode.

[0020] Meanwhile, the driving control unit can control the output of a first level voltage to the red light-emitting diode, a second level voltage higher than the first level to the green light-emitting diode, and a third level voltage higher than the second level to the blue light-emitting diode during the pre-charge period.

[0021] Meanwhile, the driving control unit can control the output of a fourth level voltage higher than the first level to the red light-emitting diode, a fifth level voltage higher than the fourth level to the green light-emitting diode, and a sixth level voltage higher than the fifth level to the blue light-emitting diode during the display period.

[0022] Meanwhile, an image display device and a video wall equipped with the same according to another embodiment of the present disclosure include a panel having a plurality of light-emitting diodes and a discharge switching element disposed between the anode of the light-emitting diode and a ground terminal, and a driving control unit that outputs a scan signal to the light-emitting diode for each of the plurality of sub-frame periods and outputs a pulse width variable-based data signal, wherein the driving control unit supplies a positive polarity charging voltage to the anode of the light-emitting diode during the precharge period, supplies a positive polarity data voltage based on the pulse width variable-based data signal during the display period, and after the supply of the data voltage ends, turns on the discharge switching element to control the anode of the light-emitting diode to be connected to the ground terminal.

[0023] Meanwhile, the driving control unit can turn on the discharge switching element for a portion of the display period so that the anode of the light-emitting diode is connected to the ground terminal.

[0024] Meanwhile, the driving control unit can set the turn-on period of the discharge switching element based on the capacitance of the light-emitting diode.

[0025] Meanwhile, the driving control unit can be set so that when the capacitance of the light-emitting diode is greater than that of the green light-emitting diode or blue light-emitting diode than that of the red light-emitting diode, the turn-on period of the discharge switching element of the green light-emitting diode or blue light-emitting diode is greater than that of the red light-emitting diode.

[0026] Meanwhile, the driving control unit can be set so that when the capacitance of the light-emitting diode increases in the order of red light-emitting diode, green light-emitting diode, and blue light-emitting diode, the turn-on period of the discharge switching element increases in the order of red light-emitting diode, green light-emitting diode, and blue light-emitting diode.

[0027] A video display device and a video wall equipped with the same according to one embodiment of the present disclosure include a light-emitting diode, a first switching element connected to the anode of the light-emitting diode and performing switching, a second switching element connected to the cathode of the light-emitting diode, a third switching element disposed between the anode of the light-emitting diode and a ground terminal, and a driving control unit that outputs a scan signal to the second switching element for each of a plurality of sub-frame periods and outputs a data signal based on the pulse width variation of the first switching element, wherein the driving control unit outputs a discharge control signal to turn on the third switching element after the turn-on period of the first switching element based on the data signal. Accordingly, power consumption can be reduced. In particular, power consumption can be reduced while improving low-gradation expression capability.

[0028] An image display device and a video wall equipped with the same according to one embodiment of the present disclosure further include a fourth switching element connected to the anode of a light-emitting diode and supplying a buffer current based on a switching operation, and a driving control unit can output a discharge control signal to turn on a third switching element during the off period of the fourth switching element. Accordingly, power consumption can be reduced.

[0029] Meanwhile, the driving control unit can turn on the fourth switching element during the precharge period and turn off the fourth switching element during the display period. Accordingly, power consumption can be reduced.

[0030] Meanwhile, the driving control unit can control the second switching element to turn on during the first display period from the first point in time during the first precharge period, control the first switching element to turn on from the second point in time to the third point in time during the first display period, and control the third switching element to turn on from the third point in time to the fourth point in time during the first display period. Accordingly, power consumption can be reduced.

[0031] Meanwhile, the driving control unit can control the turn-on period of the third switching element to be shorter than the turn-on period of the first switching element during the first display period. Accordingly, power consumption can be reduced.

[0032] Meanwhile, the driving control unit can control the third switching element to turn off from the fourth point in time during the first display period. Accordingly, power consumption can be reduced.

[0033] Meanwhile, the driving control unit can set the turn-on period of the third switching element based on the clock signal. Accordingly, power consumption can be reduced.

[0034] Meanwhile, the driving control unit can set the turn-on period of the third switching element based on the capacitance of the light-emitting diode.

[0035] Meanwhile, the driving control unit can be set so that the turn-on period of the third switching element increases as the capacitance of the light-emitting diode increases. Accordingly, power consumption can be reduced.

[0036] Meanwhile, the driving control unit can be set so that when the capacitance of the light-emitting diode is a green light-emitting diode or a blue light-emitting diode is greater than the capacitance of the red light-emitting diode, the turn-on period of the third switching element of the green light-emitting diode or the blue light-emitting diode is greater than the turn-on period of the third switching element of the red light-emitting diode. Accordingly, power consumption can be reduced.

[0037] Meanwhile, the driving control unit can be set so that when the capacitance of the light-emitting diodes increases in the order of the red light-emitting diode, green light-emitting diode, and blue light-emitting diode, the turn-on period of the third switching element increases in the order of the red light-emitting diode, green light-emitting diode, and blue light-emitting diode. Accordingly, power consumption can be reduced.

[0038] Meanwhile, the driving control unit can control the output to a first level voltage to the red light-emitting diode, a second level voltage higher than the first level to the green light-emitting diode, and a third level voltage higher than the second level to the blue light-emitting diode during the pre-charge period. Accordingly, power consumption can be reduced.

[0039] Meanwhile, the driving control unit can control the output to a fourth level voltage higher than the first level to the red light-emitting diode, a fifth level voltage higher than the fourth level to the green light-emitting diode, and a sixth level voltage higher than the fifth level to the blue light-emitting diode during the display period. Accordingly, power consumption can be reduced.

[0040] Meanwhile, an image display device and a video wall equipped with the same according to another embodiment of the present disclosure include a panel having a plurality of light-emitting diodes and a discharge switching element disposed between the anode of a light-emitting diode and a ground terminal, and a driving control unit that outputs a scan signal to the light-emitting diode for each of a plurality of sub-frame periods and outputs a pulse width variable-based data signal. The driving control unit supplies a positive polarity charging voltage to the anode of the light-emitting diode during a precharge period, supplies a positive polarity data voltage based on the pulse width variable-based data signal during a display period, and after the supply of the data voltage ends, turns on the discharge switching element to control the anode of the light-emitting diode to be connected to the ground terminal. Accordingly, power consumption can be reduced. In particular, power consumption can be reduced while improving low-gradation expression capability.

[0041] Meanwhile, the driving control unit can turn on the discharge switching element for a portion of the display period so that the anode of the light-emitting diode is connected to the ground terminal. Accordingly, power consumption can be reduced.

[0042] Meanwhile, the driving control unit can set the turn-on period of the discharge switching element based on the capacitance of the light-emitting diode. Accordingly, power consumption can be reduced.

[0043] Meanwhile, the driving control unit can be set so that when the capacitance of the light-emitting diode is greater than that of the green light-emitting diode or blue light-emitting diode than that of the red light-emitting diode, the turn-on period of the discharge switching element of the green light-emitting diode or blue light-emitting diode is greater than that of the red light-emitting diode. Accordingly, power consumption can be reduced.

[0044] Meanwhile, the driving control unit can be set so that when the capacitance of the light-emitting diodes increases in the order of red light-emitting diode, green light-emitting diode, and blue light-emitting diode, the turn-on period of the discharge switching element increases in the order of red light-emitting diode, green light-emitting diode, and blue light-emitting diode. Accordingly, power consumption can be reduced.

[0045] FIG. 1 is a drawing illustrating a video wall according to one embodiment of the present disclosure.

[0046] Figure 2 is an example of an internal block diagram of the video wall of Figure 1.

[0047] Figure 3 is an example of an internal block diagram of the signal processing device of Figure 2.

[0048] Figure 4 is an internal block diagram of the display of Figure 2.

[0049] FIGS. 5a to 5c are drawings referenced in the description of the light-emitting panel of FIG. 4.

[0050] Figure 6 is a drawing illustrating an example of the light-emitting panel of Figure 4.

[0051] FIGS. 7a to 7d are drawings referenced in the description of the operation of an image display device related to the present disclosure.

[0052] FIG. 8 is a drawing illustrating an example of a light-emitting panel according to one embodiment of the present disclosure.

[0053] FIG. 9 illustrates an example of a scan signal and a data signal applied to a light-emitting diode.

[0054] FIG. 10a illustrates a pixel driving circuit related to the present disclosure.

[0055] FIGS. 10b to 11b are drawings referenced in the description of FIG. 10a.

[0056] FIG. 12 illustrates an example of a pixel driving circuit according to an embodiment of the present disclosure.

[0057] FIGS. 13a to 13c are drawings referenced in the description of FIG. 12.

[0058] FIG. 14 illustrates another example of a pixel driving circuit according to an embodiment of the present disclosure.

[0059] FIGS. 15a to 18d are drawings referenced in the description of FIG. 12 or FIG. 14.

[0060] The present disclosure will be described in more detail below with reference to the drawings.

[0061] The suffixes "module" and "part" for components used in the following description are assigned solely for the ease of drafting this specification and do not inherently confer any particularly significant meaning or role. Accordingly, the terms "module" and "part" may be used interchangeably.

[0062] FIG. 1 is a drawing illustrating a video wall according to one embodiment of the present disclosure.

[0063] Referring to the drawings, a video wall (10) according to one embodiment of the present disclosure may include a plurality of image display devices (100a to 100d).

[0064] A video wall (10) according to one embodiment of the present disclosure can receive video from a set-top box (not shown), a server (not shown), or an internal memory, etc.

[0065] For example, the video wall (10) can receive a video signal from a set-top box (not shown) through an HDMI terminal.

[0066] As another example, the video wall (10) can receive a video signal from a server (not shown) through a network terminal.

[0067] Meanwhile, the video wall (10) can be installed inside or outside the building.

[0068] For example, the 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 announcements. It can also be placed around show windows in stores such as department stores, shopping malls, and large supermarkets to advertise specific products.

[0069] As another example, the video wall (10) can be installed on a wall inside the house.

[0070] This video wall (10) may be equipped with a plurality of displays (180a to 180d) arranged adjacently.

[0071] Meanwhile, the plurality of displays (180a to 180d) can be implemented as any one of various panels. For example, the plurality of displays (180a to 180d) can be any one of a liquid crystal display panel (LCD panel), a light-emitting panel (OLED panel), an inorganic light-emitting panel (LED panel), etc.

[0072] In this disclosure, the focus is on describing a plurality of displays (180a to 180d) having inorganic light-emitting panels (LED panels).

[0073] Meanwhile, inorganic light-emitting panels (LED panels) contain light-emitting diodes and have the advantage of excellent response speed and color reproduction effects.

[0074] Meanwhile, a plurality of displays (180a to 180d) may be provided with a plurality of panels (210a to 210d) and a bezel (Ba to Bd) surrounding the panels (210a to 210d).

[0075] In the drawing, the video wall (10) is exemplified as having a plurality of image display devices (100a to 100d), each having a display (180a to 180d).

[0076] Alternatively, for displaying images on the video wall (10), signal processing devices (170~170d) provided in each of the plurality of image display devices (100a~100d) may be used.

[0077] For example, an image distributed from a signal processing device (170) is input to a signal processing device (170~170d) provided in each of a plurality of image display devices (100a~100d), and an image processed by each signal processing device (170~170d) is input to each display (180a~180d), and each display (180a~180d) can display the corresponding image.

[0078] Accordingly, the viewer (50) can watch the video displayed on the video wall (10) as shown in the drawing. In particular, the viewer can watch the video displayed on multiple displays (180a to 180d).

[0079] As another example, the video wall (10) may be equipped with a single signal processing device that controls a plurality of image display devices (100a to 100d) in common. Accordingly, the common signal processing device can perform signal processing for the displayed image. Then, the image signal processed is input to each display (180a to 180d), and each display (180a to 180d) can display the corresponding image.

[0080] Meanwhile, when a plurality of displays (180a to 180d) are driven based on a passive matrix method, an inorganic light-emitting panel including a light-emitting diode is driven, the light-emitting diode is made to emit light or not emit light by using a plurality of subframes.

[0081] Figure 2 is an example of an internal block diagram of the video wall of Figure 1.

[0082] Referring to the drawing, the video wall (10) may be equipped with first to fourth image display devices (100a to 100d).

[0083] In the drawings, for convenience, the second to fourth image display devices (100b to 100d) are each shown as having a second to fourth display (180b to 180d) and a second to fourth signal processing device (170b to 170d), but alternatively, they may be equipped 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.

[0084] Meanwhile, the first video 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 unit (170), a signal processing unit (170), a first display (180a), a power supply unit (190), an audio output unit (185), etc.

[0085] 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).

[0086] For example, the external device interface section (130) may include an HDMI terminal, an RGB terminal, a component terminal, a USB terminal, a micro SD terminal, etc.

[0087] The network interface unit (135) provides an interface for connecting the video display device (100) to a wired / wireless network including the Internet network. For example, the network interface unit (135) can transmit and receive content or data provided by the Internet or a content provider or network operator through the network.

[0088] 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.

[0089] Additionally, the memory (140) may perform the function of temporarily storing video, audio, or data signals input to the external device interface unit (130).

[0090] Meanwhile, a plurality of displays (180a to 180d) may be arranged adjacent to each other and may be equipped with various display panels such as LCD, OLED, and PDP, and may display a predetermined image through the display panel.

[0091] 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.

[0092] To this end, the user input interface unit (150) may be equipped with a local key including a power key, a touch panel capable of inputting user information, etc.

[0093] The signal processing device (170) can distribute the input image stored in the memory (140), the input image received from an external device through the external device interface unit (130), or the network interface unit (135) into multiple images for display on multiple displays (180a to 180d).

[0094] For example, the signal processing device (170) can crop the input image into multiple images and perform scaling.

[0095] In particular, the signal processing device (170) can perform cropping and scaling, etc., by taking into account the resolution and size of a plurality of displays (180a to 180d).

[0096] Meanwhile, the signal processing device (170) may perform overall control operations of the video wall (10). Specifically, it may control the operation of each unit within the video wall (10).

[0097] 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).

[0098] Meanwhile, at least one signal processing device may be provided to control multiple displays (180a to 180d).

[0099] Meanwhile, in the drawings, to control a plurality of displays (180a to 180d), a plurality of signal processing devices (170 to 170d) corresponding to the number of a plurality of displays (180a to 180d) are illustrated.

[0100] A plurality of signal processing devices (170 to 170d) can each perform a control operation for displaying images on a plurality of displays (180a to 180d).

[0101] A plurality of signal processing devices (170 to 170d) can process an input image signal and transmit the processed image signal to a plurality of displays (180a to 180d), respectively.

[0102] 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.

[0103] The power supply unit (190) can receive external power or internal power and supply power necessary for the operation of each component.

[0104] The power supply unit (190) supplies power throughout the image display device (100). In particular, it can supply power to a plurality of signal processing devices (170~170d) that can be implemented in the form of a System On Chip (SOC), a plurality of displays (180a~180d) for image display, and an audio output unit (185) for audio output.

[0105] A temperature sensing unit (not shown) can detect the temperature of the video wall (10).

[0106] The temperature detected by the temperature sensing unit (not shown) can be input to at least one of a 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 a fan driving unit (not shown) to reduce internal heat based on the detected temperature.

[0107] Meanwhile, an image display device (100A) according to one 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).

[0108] The video receiving unit (105) may include a tuner unit (110), a demodulator unit (120), a network interface unit (130), and an external device interface unit (130).

[0109] Meanwhile, the video receiving unit (105), unlike the drawing, may include only the tuner unit (110), the demodulation unit (120), and the external device interface unit (130). That is, it may not include the network interface unit (130).

[0110] The tuner unit (110) selects an RF (Radio Frequency) broadcast signal corresponding to a channel selected by the user or all previously stored channels among the RF broadcast signals received through an antenna (not shown). Additionally, it converts the selected RF broadcast signal into an intermediate frequency signal or a baseband video or audio signal.

[0111] 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 a signal processing device (170).

[0112] Meanwhile, the tuner unit (110) may be equipped with multiple tuners to receive multiple channels of broadcast signals. Alternatively, a single tuner that simultaneously receives multiple channels of broadcast signals is also possible.

[0113] The demodulator (120) receives the digital IF signal (DIF) converted by the tuner (110) and performs a demodulation operation.

[0114] The demodulation unit (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.

[0115] The stream signal output from the demodulation unit (120) can be input to the signal processing unit (170). The signal processing unit (170) performs demultiplexing, video / audio signal processing, etc., then outputs video to the display (180) and outputs audio to the audio output unit (185).

[0116] The external device interface unit (130) can transmit or receive data with 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).

[0117] The external device interface section (130) can be connected wirelessly or via wired connection to external devices such as a DVD (Digital Versatile Disk), Blu-ray, game console, camera, camcorder, computer (laptop), set-top box, etc., and can also perform input / output operations with the external devices.

[0118] 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.

[0119] Through such a 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, information on an application being executed, an application image, etc. from the mobile terminal (600) in mirroring mode.

[0120] The network interface unit (135) provides an interface for connecting the video display device (100) to a wired / wireless network including the Internet network. For example, the network interface unit (135) can receive content or data provided by the Internet or a content provider or network operator through the network.

[0121] Meanwhile, the network interface section (135) may include a wireless communication section (not shown).

[0122] 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.

[0123] Additionally, the memory (140) may perform the function of temporarily storing video, audio, or data signals input to the external device interface unit (130). Additionally, the memory (140) may store information regarding a predetermined broadcast channel through a channel memory function such as a channel map.

[0124] Although the memory (140) of FIG. 2 is illustrated in an embodiment in which it 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).

[0125] 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.

[0126] For example, user input signals such as power on / off, channel selection, and screen settings can be transmitted / received from a remote control device (200), user input signals input from local keys (not shown) such as a power key, channel key, volume key, and setting value can be transmitted to a signal processing device (170), user input signals input from a sensor unit (not shown) that senses a user's gesture can be transmitted to a signal processing device (170), or signals from the signal processing device (170) can be transmitted to a sensor unit (not shown).

[0127] The signal processing device (170) can demultiplex a stream input through the tuner unit (110), the demodulator unit (120), the network interface unit (135), or the external device interface unit (130), or process the demultiplexed signals to generate and output a signal for video or audio output.

[0128] For example, the signal processing device (170) can receive a broadcast signal or an HDMI signal, etc., received from the video receiving unit (105), perform signal processing based on the received broadcast signal or HDMI signal, and output a signal-processed video signal.

[0129] The image signal processed by the signal processing device (170) can be input to the display (180) and displayed as an image corresponding to the image signal. Additionally, the image signal processed by the signal processing device (170) can be input to an external output device through the external device interface unit (130).

[0130] The voice signal processed by the signal processing device (170) can be sound-outputted to the audio output unit (185). Additionally, the voice signal processed by the signal processing device (170) can be input to an external output device through the external device interface unit (130).

[0131] Although not illustrated in FIG. 2, the signal processing device (170) may include a demultiplexer, an image processing unit, etc. That is, the signal processing device (170) can perform various signal processing and, accordingly, can be implemented in the form of a System On Chip (SOC). This will be described later with reference to FIG. 3.

[0132] In addition, the signal processing device (170) can control the overall operation within the image display device (100). For example, the signal processing device (170) can control the tuner unit (110) to control the selection (tuning) of an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

[0133] Additionally, the signal processing device (170) can control the image display device (100) by means of a user command or internal program input through the user input interface unit (150).

[0134] 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 video, and may be a 2D image or a 3D image.

[0135] Meanwhile, the signal processing device (170) can cause a predetermined object to be displayed within the image displayed on the display (180). For example, the object may 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.

[0136] Meanwhile, the signal processing device (170) can recognize the user's location based on an image captured by a shooting unit (not shown). For example, it can determine the distance (z-axis coordinate) between the user and the image display device (100). In addition, it can determine the x-axis coordinate and y-axis coordinate within the display (180) corresponding to the user's location.

[0137] The display (180) generates a driving signal by converting a video signal, data signal, OSD signal, control signal processed by a signal processing device (170) or a video signal, data signal, control signal, etc. received from an external device interface unit (130).

[0138] Meanwhile, the display (180) can be configured as a touch screen and used as an input device in addition to an output device.

[0139] The audio output unit (185) receives a voice-processed signal from the signal processing unit (170) and outputs it as voice.

[0140] The shooting unit (not shown) photographs the user. The shooting unit (not shown) can be implemented with one camera, but is not limited thereto, and can also be implemented with multiple cameras. The image information captured by the shooting unit (not shown) can be input to the signal processing device (170).

[0141] The signal processing device (170) can detect a user's gesture based on each or a combination of an image captured from a shooting unit (not shown) or a signal detected from a sensor unit (not shown).

[0142] The power supply unit (190) supplies power throughout the 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.

[0143] 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 DC power.

[0144] 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, infrared (IR) communication, UWB (Ultra Wideband), ZigBee, etc. Additionally, the remote control device (200) may receive video, audio, or data signals output from the user input interface unit (150) and display or output audio from the remote control device (200).

[0145] Meanwhile, the above-described video display device (100) may be a digital broadcast receiver capable of receiving fixed or mobile digital broadcasts.

[0146] Meanwhile, the block diagram of the image display device (100) illustrated in FIG. 3 is a block diagram for an embodiment of the present disclosure. Each component of the block diagram may be integrated, added, or omitted according to the specifications of the image display device (100) actually implemented. That is, as necessary, two or more components may be combined into one component, or one component may be subdivided into two or more components. Furthermore, the functions performed in each block are intended to explain the embodiments of the present disclosure, and the specific operations or devices thereof do not limit the scope of the rights of the present disclosure.

[0147] Figure 3 is an example of an internal block diagram of the signal processing device of Figure 2.

[0148] Referring to the drawings, a signal processing device (170) according to one embodiment of the present disclosure may include a demultiplexer (310), an image processing unit (320), a processor (330), and an audio processing unit (370). Additionally, it may further include a data processing unit (not shown).

[0149] The demultiplexer (310) demultiplexes the input stream. For example, if an MPEG-2 TS is input, it can be demultiplexed to separate it into video, audio, and data signals. 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).

[0150] The image processing unit (320) can perform signal processing on the input image. For example, the image processing unit (320) can perform image processing on the image signal demultiplexed from the demultiplexing unit (310).

[0151] 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), etc.

[0152] The video decoder (325) decodes the demultiplexed video signal, and the scaler (335) performs scaling so that the resolution of the decoded video signal can be output on the display (180).

[0153] The image decoder (325) may be equipped with decoders of various specifications. For example, it may be equipped with MPEG-2, H,264 decoders, 3D image decoders for color images and depth images, decoders for multiple viewpoint images, etc.

[0154] The scaler (335) can scale the input video signal, which has been decoded in the video decoder (325), etc.

[0155] For example, the scaler (335) can upscale when the size or resolution of the input video signal is small, and downscale when the size or resolution of the input video signal is large.

[0156] The image quality processing unit (635) can perform image quality processing on the input image signal, which has been decoded in the image decoder (325), etc.

[0157] For example, the image processing unit (635) can perform noise removal processing of the input image signal, expand the resolution of the grayscale of the input image signal, perform image resolution enhancement, perform high dynamic range (HDR) based signal processing, vary the frame image rate, and perform image processing corresponding to panel characteristics, particularly the light-emitting panel.

[0158] The OSD processing unit (340) generates an OSD signal based on user input or independently. For example, based on a user input signal, it can generate a signal to display various information as graphics or text on the screen of the display (180). The generated OSD signal may include various data such as user interface screens, various menu screens, widgets, and icons of the image display device (100). Additionally, the generated OSD signal may include 2D objects or 3D objects.

[0159] Additionally, the OSD processing unit (340) can generate a pointer that can be displayed on a display based on a pointing signal input from the remote control device (200). In particular, such a pointer can be generated by a pointing control unit, and the OSD processing unit (240) may include such a pointing control unit (not shown). Of course, it is also possible for the pointing control unit (not shown) to be provided separately rather than being provided within the OSD processing unit (240).

[0160] The frame rate converter (FRC) (350) can convert the frame rate of the input video. Meanwhile, the frame rate converter (350) can also output the video as is without converting the frame rate.

[0161] Meanwhile, the formatter (360) can convert the format of the input video signal into a video signal for display on a display and output it.

[0162] In particular, the formatter (360) can change the format of the video signal to correspond to the display panel.

[0163] The processor (330) can control the overall operation within the image display device (100) or the signal processing device (170).

[0164] For example, the processor (330) can control the tuner (110) to select (Tuning) an RF broadcast corresponding to a channel selected by the user or a pre-stored channel.

[0165] Additionally, the processor (330) can control the image display device (100) by means of a user command or an internal program input through the user input interface unit (150).

[0166] Additionally, the processor (330) can perform data transmission control with the network interface unit (135) or the external device interface unit (130).

[0167] Additionally, the processor (330) can control the operation of the demultiplexer (310), image processing unit (320), etc., within the signal processing device (170).

[0168] Meanwhile, the audio processing unit (370) within the signal processing device (170) can perform voice processing of the demultiplexed voice signal. To this end, the audio processing unit (370) may be equipped with various decoders.

[0169] Additionally, the audio processing unit (370) within the signal processing device (170) can process bass, treble, volume control, etc.

[0170] A data processing unit (not shown) within a signal processing device (170) can perform data processing of 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 containing broadcast information such as the start time and end time of a broadcast program aired on each channel.

[0171] Meanwhile, the block diagram of the signal processing device (170) illustrated in FIG. 4 is a block diagram for an embodiment of the present disclosure. Each component of the block diagram may be integrated, added, or omitted according to the specifications of the signal processing device (170) actually implemented.

[0172] In particular, the frame video rate converter (350) and the formatter (360) may be provided separately from the video processing unit (320).

[0173] Figure 4 is an internal block diagram of the display of Figure 2.

[0174] Referring to the drawing, the light-emitting panel-based display (180) may include a light-emitting panel (210), a first interface unit (230), a second interface unit (231), a timing controller (232), a scan driving unit (234), a data driving unit (236), a memory (240), a power supply unit (290), etc.

[0175] The display (180) receives a video signal (Vd), a first DC power supply (V1), and a second DC power supply (V2), and can display a predetermined image based on the video signal (Vd).

[0176] Meanwhile, the first interface unit (230) within the display (180) can receive a video signal (Vd) and a first DC power supply (V1) from the signal processing device (170).

[0177] Here, the first DC power supply (V1) can be used for the operation of the power supply unit (290) and the timing controller (232) within the display (180).

[0178] 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 driving unit (236) within the display (180).

[0179] The timing controller (232) can output a data driving signal (Sda) and a scan driving signal (Sga) based on the video signal (Vd).

[0180] For example, when the first interface unit (230) converts an input video signal (Vd) and outputs a converted video signal (va1), the timing controller (232) can output a data driving signal (Sda) and a scan driving signal (Sga) based on the converted video signal (va1).

[0181] The timing controller (232) can receive additional signals, such as a control signal and a vertical synchronization signal (Vsync), in addition to the video signal (Vd) from the signal processing device (170).

[0182] In addition, the timing controller (232) can output a scan drive signal (Sga) for the operation of the scan 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 the video signal (Vd).

[0183] 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.

[0184] Meanwhile, the timing controller (232) can further output a control signal (Cs) to the scan drive unit (234).

[0185] The scan driving unit (234) and the data driving unit (236) supply a scan signal and a data signal to the light-emitting panel (210) through the scan line (GL) and the data line (DL), respectively, according to the scan driving signal (Sga) and the data driving signal (Sda) from the timing controller (232). Accordingly, the light-emitting panel (210) displays a predetermined image.

[0186] Meanwhile, the light-emitting panel (210) may include a light-emitting layer, and to display an image, a plurality of scan lines (GL) and data lines (DL) may be arranged in an intersecting matrix form at each pixel corresponding to the light-emitting layer.

[0187] Meanwhile, the data driving unit (236) can output a data signal to the light-emitting panel (210) based on the second DC power supply (V2) from the second interface unit (231).

[0188] The power supply unit (290) can supply various power sources to the scan drive unit (234), data drive unit (236), timing controller (232), etc.

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

[0190] Accordingly, the timing controller (232), scan drive unit (234), and data drive unit (236) can be named as 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) within the drive 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 referenced in the description of the light-emitting panel of FIG. 4.

[0194] First, FIG. 5a is a drawing showing a pixel 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) that intersect 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 having RGB subpixels (SR1, SG1, SB1) is shown.

[0197] Meanwhile, a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode are placed in the RGB subpixels (SR1, SG1, SB1), respectively.

[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 subpixel circuit (CRTm) is of the passive type and can be equipped with only 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, a light-emitting diode can emit light or not emit light based on a plurality of subframes 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 so that it is 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 LVc level in response to the scan timing of the scan signal (Vscan).

[0208] Figure 5c (c) illustrates a data signal (Vdatam) that maintains the level of LVd and then rises to a level higher than LVc, LVe, in response to the scan timing of the scan signal (Vscan).

[0209] A data signal (Vdata) of the LVc level can be applied to a red light-emitting diode, and a data signal (Vdatam) of the LVe level, which is 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 furthermore, to achieve uniform color realization.

[0211] Meanwhile, the data signal (Vdata) of Fig. 5c (b) or the data signal (Vdatam) of Fig. 5c (c) is a pulse width variable-based data signal, and the brightness of the light-emitting diode is varied by varying the duty cycle corresponding to the pulse width.

[0212] Figure 6 is a drawing illustrating an example of the light-emitting panel of Figure 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, for convenience of explanation, four data lines (Data 1 to Data 4) and four scan lines (Scan 1 to Scan 4) are exemplified as an example of a light-emitting panel (210).

[0215] FIGS. 7a to 7d are drawings referenced in the description of the operation of an image display device related to the present disclosure.

[0216] FIG. 7a illustrates an example of a data signal applied in correspondence with the case where the frame gradation is the first gradation during a plurality of sub-frame periods within a frame period.

[0217] Referring to the drawing, multiple subframe periods (Subframe 1 to 3) may be provided within a frame period (Frame 1).

[0218] For convenience of explanation, the drawing shows three subframe periods (Subframe 1 to 3) within a frame period (Frame 1), but various variations are possible.

[0219] Figure 7a (a) illustrates that during the first subframe (Subframe 1) period among a plurality of subframes (Subframe 1 to 3), data signals (Vdata 1 to 4) are applied to each of the four data lines shown in Figure 6.

[0220] In the drawing, data signals (Vdata 1 to 4) having four pulses or voltages (V) each on four data lines are exemplified during the period of the first subframe (Subframe 1).

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

[0222] Figure 7a (b) illustrates that scan signals (Vscan 1 to 4) are sequentially applied to each of the four scan lines during the period of the first subframe (Subframe 1).

[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 period of the second subframe (Subframe 2), data signals (Vdata 1 to 4) are applied to each of the four data lines shown in Figure 6.

[0225] In the drawing, data signals (Vdata 1 to 4) having one pulse or voltage (V) on each of the four data lines during the period of the second subframe (Subframe 2) are exemplified.

[0226] Figure 7a (b) illustrates that scan signals (Vscan 1 to 4) are sequentially applied to each of the four scan lines during the period of the second subframe (Subframe 2).

[0227] Accordingly, during the second subframe 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 period, data signals (Vdata 1 to 4) are applied to each of the four data lines shown in Figure 6.

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

[0230] Figure 7a (b) illustrates that scan signals (Vscan 1 to 4) are sequentially applied to each of the four scan lines during the period of the third subframe (Subframe 3).

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

[0232]

[0233] FIG. 7b illustrates an example of a data signal applied in response to a case where the frame gradation is a second gradation lower than the first gradation during a plurality of sub-frame periods within a frame period.

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

[0235] In the drawing, data signals (Vdata 1 to 4) having four pulses or voltages (V) each on four data lines are exemplified during the period of the first subframe (Subframe 1).

[0236] At this time, the pulse width of the data signal (Vdata 1~4) can be Wx.

[0237] Figure 7b (b) illustrates that scan signals (Vscan 1 to 4) are sequentially applied to each of the four scan lines during a period of multiple subframes (Subframe 1 to 3).

[0238] Accordingly, during the first subframe (Subframe 1) period, 16 light-emitting diodes emit light as shown in (c) of Fig. 7b.

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

[0240] Accordingly, during the second subframe (Subframe 2) period, four light-emitting diodes in the diagonal direction light up as shown in (c) of FIG. 7b, and during the third subframe (Subframe 3) period, all 16 light-emitting diodes are turned off and do not light up.

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

[0242] FIG. 7c(a) illustrates that during the first subframe (Subframe 1) period of a plurality of subframes (Subframe 1 to 3), data signals (Vdata 1 to 4) each having one pulse or voltage (V) are applied to the four data lines shown in FIG. 6, and during the second subframe (Subframe 2) period and the third subframe (Subframe 3) period, no pulse or voltage (V) is applied.

[0243] Figure 7c (b) illustrates that scan signals (Vscan 1 to 4) are sequentially applied to each of the 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 light up as shown in (c) of FIG. 7c, 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 light up.

[0245] FIG. 8 is a drawing illustrating an example of a light-emitting panel according to one embodiment of the present disclosure.

[0246] Referring to the drawings, a light-emitting panel (210) according to one embodiment of the present disclosure has a plurality of driving control units (285a to 285h).

[0247] In the drawings, drive control units (285a~285h) arranged in an n*4 configuration are exemplified, but are not limited thereto and various variations are possible.

[0248] Meanwhile, each driving control unit (285a~285h) outputs a scan signal to a plurality of light-emitting diodes for a plurality of sub-frame periods and outputs a data signal for image display.

[0249] For example, each drive control unit (285a to 285h) can output a data signal based on pulse width modulation (PWM) based on a constant current source.

[0250] FIG. 9 illustrates an example of a scan signal and a data signal applied to a light-emitting diode.

[0251] Referring to the drawing, a scan signal (SC) and a data signal (DT) applied to a light-emitting diode (LED) based on a clock signal (GCLK) can be output.

[0252] The data signal (DT) may be a data signal based on pulse width modulation (PWM) based on a constant current source.

[0253] Meanwhile, the scan signal (SC) has a high level and a low level, and the scan switching element can be turned on in response to the low level.

[0254] Meanwhile, the data signal (DT) has a high level and a low level, and the data switching element can be turned on in response to the low level.

[0255] FIG. 10a illustrates a pixel driving circuit related to the present disclosure.

[0256] Referring to the drawings, the pixel driving circuit (1000) related to the present disclosure may include a current source (ICH) that outputs current, a light-emitting diode (LED), a data switching element (SWD) between the current source (ICH) and the light-emitting diode (LED), a scan switching element (SWC) between the light-emitting diode (LED) and a ground terminal, and a precharge switching element (SWB) between a buffer (AMP) and the light-emitting diode (LED).

[0257] The data switching element (SWD) can switch based on a data signal or a data switching control signal (SSWD).

[0258] The scan switching element (SWC) can switch based on a scan signal or a scan switching control signal (SSWC).

[0259] The precharge switching element (SWB) can switch based on the precharge switching control signal (SSWB).

[0260] Meanwhile, a buffer control signal (SEN) can be supplied to the buffer (AMP).

[0261] Meanwhile, the data switching element (SWD) and the scan switching element (SWC) may be P-type metal oxide semiconductors (PMOS) that are turned on at a low level.

[0262] Meanwhile, the precharge switching device (SWB) may be an N-type metal oxide semiconductor (NMOS) that is turned on at a high level.

[0263] FIGS. 10b to 11b are drawings referenced in the description of FIG. 10a.

[0264] FIGS. 10b to 10d are drawings illustrating the discharge of a light-emitting diode using an amplifier.

[0265] First, FIG. 10b illustrates an example of each switching control signal within the pixel driving circuit (1000) of FIG. 10a.

[0266] Referring to the drawing, during the first precharge period (Pra), the precharge switching control signal (SSWBx) is at a high level, and accordingly, the precharge switching element (SWB) can be turned on.

[0267] Meanwhile, during the first pre-charge period (Pra), the data switching control signal (SSWDx) is at a high level, and accordingly, the data switching element (SWD) can be turned off.

[0268] Meanwhile, during the first precharge period (Pra), the buffer control signal (SEN) may be at a high level.

[0269] Meanwhile, the buffer control signal (SEN) may remain at a high level for a first precharge period (Pra), a display period (Pda), and a second precharge period (Prb).

[0270] Meanwhile, at the time of Tox within the first pre-charge period (Pra), the scan switching control signal (SSWCx) is converted from a high level to a low level. Accordingly, from the time of Tox, the scan switching element (SWC) is turned on.

[0271] Accordingly, during the first precharge period (Pra), between the Tox period and the T1x period, current flows through the buffer (AMP), precharge switching element (SWB), light-emitting diode (LED), and scan switching element (SWC).

[0272]

[0273] Ultimately, between the Tox period and the T1x period, the anode of the light-emitting diode (LED) can be charged with a high-level voltage of the buffer control signal (SEN).

[0274] During the indication period (Pda) after the first precharge period (Pra), the scan switching control signal (SSWCx) may be at a low level.

[0275] Meanwhile, during the display period (Pda), from time T1x to time T2x, the precharge switching control signal (SSWBx) and the data switching control signal (SSWDx) may be at a low level.

[0276] Accordingly, during the display period (Pda), from time T1x to time T2x, the precharge switching element (SWB) is turned off and the data switching element (SWD) is turned on.

[0277] That is, during the display period (Pda), from time T1x to time T2x, current flows through the current source (ICH), data switching element (SWD), light-emitting diode (LED), and scan switching element (SWC). Accordingly, the light-emitting diode (LED) emits light.

[0278] Meanwhile, the data switching control signal (SSWDx) is a pulse width variable signal, and accordingly, the time T2x is varied so that the brightness of the light-emitting diode (LED) can be controlled.

[0279] Meanwhile, during the display period (Pda), from time T2x to time T3x, the data switching control signal (SSWDx) may be at a high level. Accordingly, the data switching element (SWD) is turned off, and the light-emitting diode (LED) does not emit light.

[0280] Meanwhile, during the indication period (Pda), from time T2x to time T3x, the precharge switching control signal (SSWBx) may be at a high level.

[0281] That is, during the display period (Pda), from time point T2x to time point T3x, current can flow through the buffer (AMP), precharge switching element (SWB), light-emitting diode (LED), and scan switching element (SWC). Accordingly, after time point T2x during the display period (Pda), the voltage of the anode of the light-emitting diode (LED) can be discharged using the buffer (AMP).

[0282] Meanwhile, during the second precharge period (Prb) after the indication period (Pda), the precharge switching control signal (SSWBx) is at a high level, the data switching control signal (SSWDx) is at a high level, and the scan switching control signal (SSWCx) may be at a high level.

[0283] FIG. 10c is a diagram illustrating each signal waveform from time T1x to time T2x during the display period (Pda).

[0284] Referring to the drawing, during the display period (Pda), from time T1x to time T2x, the data switching control signal (SSWDx) may be at a high level.

[0285] For example, if the data switching element (SWD) is an N-type metal oxide semiconductor (NMOS), the data switching element (SWD) can be turned on according to the high level of the data switching control signal (SSWDx) from time T1x to time T2x during the display period (Pda).

[0286] Meanwhile, during the display period (Pda), from time T1x to time T2x, the precharge switching control signal (SSWBx) may be at a low level.

[0287] For example, if the precharge switching element (SWB) is an N-type metal oxide semiconductor (NMOS), the precharge switching element (SWB) can be turned off according to the low level of the precharge switching control signal (SSWBx) from time T1x to time T2x during the indication period (Pda).

[0288] Accordingly, the voltage (VDx) applied to the light-emitting diode (LED) rises from time T1x and maintains a high level.

[0289] Similarly, the current (IDx) flowing through the light-emitting diode (LED) rises from time T1x and maintains a high level.

[0290] Meanwhile, after time T2x, the data switching control signal (SSWDx) may be at a low level and the precharge switching control signal (SSWBx) may be at a high level.

[0291] Meanwhile, during the display period (Pda), the buffer control signal (SEN) can continue to maintain a high level.

[0292] FIG. 10d illustrates the operation of the pixel driving circuit (100) after the time T2x.

[0293] Referring to the drawing, after time T2x, the data switching control signal (SSWDx) is at a low level and the precharge switching control signal (SSWBx) is at a high level, so the data switching element (SWD) is turned off and the precharge switching control signal (SSWBx) is turned on.

[0294] Accordingly, the voltage (VDx) of the light-emitting diode (LED) decreases from time T2x and maintains a low level at time Tax.

[0295] Similarly, the current (IDx) flowing through the light-emitting diode (LED) decreases from time T2x and maintains a low level at time Tax.

[0296] That is, after the T2x time point, current can flow through the buffer (AMP), precharge switching element (SWB), light-emitting diode (LED), and scan switching element (SWC). Accordingly, the voltage of the light-emitting diode (LED) anode can be discharged after the T2x time point during the display period (Pda).

[0297] According to the discharge technique using this buffer (APM), a tail current (ARm) occurs from T2x, the point in time when the level of the data switching control signal (SSWDx) varies, until the point in time of Tax, and consequently, there is a disadvantage of unnecessary power consumption.

[0298] In particular, after the T2x point, since the buffer control signal (SEN) from the buffer (AMP) is supplied to the light-emitting diode (LED), there is a disadvantage of unnecessary power consumption.

[0299] FIGS. 11a to 11c are drawings illustrating the floating discharge of a light-emitting diode.

[0300] FIGS. 11a to 11c are drawings illustrating the floating discharge of a light-emitting diode.

[0301] First, FIG. 11a illustrates another example of each switching control signal within the pixel driving circuit (1000) of FIG. 10a.

[0302] Referring to the drawing, during the first precharge period (Pra), the precharge switching control signal (SSWBy) is at a high level, and accordingly, the precharge switching element (SWB) can be turned on.

[0303] Meanwhile, during the first pre-charge period (Pra), the data switching control signal (SSWDy) is at a high level, and accordingly, the data switching element (SWD) can be turned off.

[0304] Meanwhile, during the first precharge period (Pra), the buffer control signal (SEN) may be at a high level.

[0305] Meanwhile, the buffer control signal (SEN) may be at a high level during the first precharge period (Pra), at a low level during the indication period (Pda), and at a high level during the second precharge period (Prb).

[0306] Meanwhile, at the Toy time within the first pre-charge period (Pra), the scan switching control signal (SSWCy) is converted from a high level to a low level. Accordingly, the scan switching element (SWC) can be turned on from the Toy time.

[0307] Accordingly, during the first precharge period (Pra), between the Toy period and the T1y period, current flows through the buffer (AMP), precharge switching element (SWB), light-emitting diode (LED), and scan switching element (SWC).

[0308] Ultimately, between the Toy period and the T1y period, the anode of the light-emitting diode (LED) can be charged with a high-level voltage of the buffer control signal (SEN).

[0309] During the indication period (Pda) after the first precharge period (Pra), the scan switching control signal (SSWCy) may remain at a low level.

[0310] Meanwhile, during the indication period (Pda), the precharge switching control signal (SSWBy) may be at a low level.

[0311] Meanwhile, during the display period (Pda), from time T1y to time T2y, the data switching control signal (SSWDy) is at a low level, and from time T2y to time T3y, it may be at a high level.

[0312] Accordingly, during the display period (Pda), from time T1y to time T2y, the precharge switching element (SWB) is turned off, and the data switching element (SWD) can be turned on.

[0313] That is, during the display period (Pda), from time T1y to time T2y, current flows through the current source (ICH), data switching element (SWD), light-emitting diode (LED), and scan switching element (SWC). Accordingly, the light-emitting diode (LED) emits light.

[0314] Meanwhile, the data switching control signal (SSWDy) is a pulse width variable signal, and accordingly, the time T2y is varied so that the brightness of the light-emitting diode (LED) can be controlled.

[0315] Meanwhile, during the display period (Pda), from time T2y to time T3y, the precharge switching element (SWB) is turned off, and the data switching element (SWD) can be turned off.

[0316] That is, during the display period (Pda), from time T2y to time T3y, the data switching element (SWD) is turned off, and the light-emitting diode (LED) does not emit light.

[0317] Meanwhile, after time T2y, when the data switching control signal (SSWDx) is at a low level and the precharge switching control signal (SSWBy) is at a low level, floating discharge is performed on the light-emitting diode (LED).

[0318] Meanwhile, during the second precharge period (Prb) after the indication period (Pda), the precharge switching control signal (SSWBy) is at a high level, the data switching control signal (SSWDy) is at a high level, and the scan switching control signal (SSWCy) may be at a high level.

[0319] FIG. 11b is a diagram illustrating each signal waveform from time T1y to time T2y during the display period (Pda).

[0320] Referring to the drawing, during the display period (Pda), from time T1y to time T2y, the data switching control signal (SSWDy) may be at a high level.

[0321] For example, if the data switching element (SWD) is an NMOS, the data switching element (SWD) can be turned on according to the high level of the data switching control signal (SSWDy) from time T1y to time T2y during the display period (Pda).

[0322] Meanwhile, during the display period (Pda), from time T1y to time T2y, the precharge switching control signal (SSWBy) may be at a low level.

[0323] For example, if the precharge switching element (SWB) is an NMOS, the precharge switching element (SWB) can be turned off according to the low level of the precharge switching control signal (SSWBy) from time T1y to time T2y during the indication period (Pda).

[0324] Accordingly, the voltage (VDy) applied to the light-emitting diode (LED) rises from time T1y and maintains a high level.

[0325] Similarly, the current (IDy) flowing through the light-emitting diode (LED) rises from time T1y and maintains a high level.

[0326] Meanwhile, after the time T2y, the data switching control signal (SSWDy) may be at a low level and the precharge switching control signal (SSWBy) may be at a low level.

[0327] Meanwhile, during the display period (Pda), the buffer control signal (SEN) can remain at a low level.

[0328] FIG. 11c illustrates the operation of the pixel driving circuit (100) after the time T2y.

[0329] Referring to the drawing, after time T2y, when the data switching control signal (SSWDy) is at a low level and the precharge switching control signal (SSWBy) is at a low level, the data switching element (SWD) is turned off and the precharge switching control signal (SSWBy) is turned off.

[0330] Accordingly, the voltage (VDy) of the light-emitting diode (LED) decreases from time T2y and maintains a low level at time Tay.

[0331] Similarly, the current (IDy) flowing through the light-emitting diode (LED) decreases from time T2y and maintains a low level at time Tay.

[0332] That is, after the T2y point, the voltage of the anode of the light-emitting diode (LED) can be discharged by floating discharge.

[0333] According to this floating discharge technique, a significant tail current (ARn) occurs from time T2y, when the level of the data switching control signal (SSWDy) varies, to time Tay, and consequently, there is a disadvantage of unnecessary power consumption.

[0334] FIG. 12 illustrates an example of a pixel driving circuit according to an embodiment of the present disclosure.

[0335] Referring to the drawings, a pixel driving circuit (1200) according to an embodiment of the present disclosure comprises a light-emitting diode (LED), a first switching element (SWD) connected to the anode of the light-emitting diode (LED) and performing switching, a second switching element (SWC) connected to the cathode of the light-emitting diode (LED), and a third switching element (SWDIS) disposed between the anode of the light-emitting diode (LED) and a ground terminal (GND).

[0336] Meanwhile, an image display device (100) according to an embodiment of the present disclosure comprises a light-emitting diode (LED), a first switching element (SWD) connected to the anode of the light-emitting diode (LED) and performing switching, a second switching element (SWC) connected to the cathode of the light-emitting diode (LED), a third switching element (SWDIS) disposed between the anode of the light-emitting diode (LED) and a ground terminal (GND), and a driving control unit (285) that outputs a scan signal (Vscan) to the second switching element (SWC) for each of a plurality of sub-frame periods and outputs a pulse width variable-based data signal (Vdata) of the first switching element (SWD).

[0337] Meanwhile, the drive control unit (285) outputs a discharge control signal (SSWDIS) that turns on the third switching element (SWDIS) after the turn-on period (T2-T3 in FIG. 13a) of the first switching element (SWD) based on the data signal (Vdata). Accordingly, power consumption can be reduced. In particular, power consumption can be reduced while improving low-gradation expression capabilities.

[0338] A pixel driving circuit (1200) according to an embodiment of the present disclosure may further include a fourth switching element (SWB) connected to the anode of a light-emitting diode (LED) and supplying a buffer current based on a switching operation.

[0339] Meanwhile, the drive control unit (285) can output a discharge control signal (SSWDIS) that turns on the third switching element (SWDIS) during the off period (T2-T5 in FIG. 13a) of the fourth switching element (SWB). Accordingly, power consumption can be reduced.

[0340] Meanwhile, the first switching element (SWD) may be a data switching element, the second switching element (SWC) may be a scan switching element, and the third switching element (SWDIS) may be named a discharge switching element.

[0341] Meanwhile, the fourth switching element (SWB) can be named a precharge switching element.

[0342] A pixel driving circuit (1200) according to an embodiment of the present disclosure may further include a current source (ICH) connected to a second switching element (SWC) and outputting current to the second switching element (SWC).

[0343] The first switching element (SWD) can switch based on a data signal (DT) or a data switching control signal (SSWD).

[0344] Meanwhile, the data signal (DT) or data switching control signal (SSWD) may be a signal based on pulse width modulation (PWM) based on a constant current source.

[0345] The second switching element (SWC) can switch based on a scan signal (SC) or a scan switching control signal (SSWC).

[0346] The third switching element (SWDIS) can switch based on the discharge switching control signal (SSWDIS).

[0347] The fourth switching element (SWB) can switch based on the precharge switching control signal (SSWB).

[0348] Meanwhile, a buffer control signal (SEN) can be supplied to the buffer (AMP) to output a low level during the display period (Pda) and output a high level during the precharge period (Pra, Prb).

[0349] Meanwhile, the first switching element (SWD) and the second switching element (SWC) may be P-type metal oxide semiconductors (PMOS) that are turned on at a low level.

[0350] Meanwhile, the third switching element (SWDIS) and the fourth switching element (SWB) may be N-type metal oxide semiconductors (NMOS) that are turned on at a high level.

[0351] Meanwhile, the driving control unit (285) can control the output of a scan signal (SC) and a data signal (DT) applied to a light-emitting diode (LED) based on a clock signal (GCLK).

[0352] Meanwhile, the drive control unit (285) can control the output of a scan switching control signal (SSWC), a data switching control signal (SSWD), a precharge switching control signal (SSWB), a discharge switching control signal (SSWDIS), and a precharge switching control signal (SSWB) based on a clock signal (GCLK).

[0353] FIGS. 13a to 13c are drawings referenced in the description of FIG. 12.

[0354] First, FIG. 13a illustrates an example of each switching control signal within the pixel driving circuit (1200) of FIG. 12.

[0355] Referring to the drawing, during the first precharge period (Pra), the precharge switching control signal (SSWB) is at a high level, and accordingly, the fourth switching element (SWB) can be turned on.

[0356] Meanwhile, during the first precharge period (Pra), the data switching control signal (SSWD) is at a high level, and accordingly, the first switching element (SWD) can be turned off.

[0357] Meanwhile, during the first precharge period (Pra), the buffer control signal (SEN) may be at a high level.

[0358] Meanwhile, the buffer control signal (SEN) may be at a high level during the first precharge period (Pra), at a low level during the indication period (Pda), and at a high level during the second precharge period (Prb).

[0359] Meanwhile, during the first precharge period (Pra), the scan switching control signal (SSWC) is at a high level before the first time point (T1), and during the first precharge period (Pra), from the first time point (T1) to the second time point (T2), the scan switching control signal (SSWC) may be at a low level.

[0360] Meanwhile, the driving control unit (285) can turn on the fourth switching element (SWB) during the precharge period (PRa, PRb) and turn off the fourth switching element (SWC) during the display period (Pd). Accordingly, the anode of the light-emitting diode (LED) can be precharged only during the precharge period (PRa, PRb).

[0361] Meanwhile, the driving control unit (285) can control the second switching element (SWC) to be turned on during the first display period (Pd) from the first time point (T1) during the first precharge period (PRa).

[0362] That is, the driving control unit (285) can control the second switching element (SWC) to be turned on from the first time point (T1) during the first precharge period (PRa) until the end time point T5 of the first display period (Pd).

[0363] Accordingly, during the first precharge period (PRa), from the first time point (T1) to the second time point (T2), current flows through the buffer (AMP), the fourth switching element (SWB), the light-emitting diode (LED), and the second switching element (SWC).

[0364] Ultimately, between the first time point (T1) and the second time point (T2), the anode of the light-emitting diode (LED) can be charged with a high-level voltage of the buffer control signal (SEN).

[0365] Meanwhile, during the first display period (Pd), the scan switching control signal (SSWC) remains at a low level, and accordingly, the second switching element (SWC) can be turned on.

[0366] Meanwhile, during the first indication period (Pd), the precharge switching control signal (SSWB) is at a low level, and accordingly, the fourth switching element (SWB) can be turned off.

[0367] Meanwhile, during the first display period (Pd), from the second time point (T2) to the third time point (T2), the data switching control signal (SSWD) is at a low level, and accordingly, the first switching element (SWD) can be turned on.

[0368] Meanwhile, during the first display period (Pd), from the third time point (T3) to the fifth time point (T5), the data switching control signal (SSWD) is at a high level, and accordingly, the first switching element (SWD) can be turned off.

[0369] Meanwhile, during the first display period (Pd), from the second time point (T2) to the third time point (T2), and from the fourth time point (T4) to the fifth time point (T5), the discharge control signal (SSWDIS) is at a low level, and accordingly, the third switching element (SWDIS) can be turned off.

[0370] Meanwhile, during the first display period (Pd), from the third time point (T3) to the fourth time point (T4), the discharge control signal (SSWDIS) is at a high level, and accordingly, the third switching element (SWDIS) can be turned on.

[0371] Meanwhile, during the first display period (Pd), the buffer control signal (SEN) may be at a low level.

[0372] Meanwhile, the drive control unit (285) can control the first switching element (SWD) to turn on from the second time point (T2) to the third time point (T2) during the first display period (Pd).

[0373] Accordingly, during the first display period (Pd), from the second time point (T2) to the third time point (T2), current flows through the current source (ICH), the first switching element (SWD), the light-emitting diode (LED), and the second switching element (SWC). Accordingly, the light-emitting diode (LED) emits light.

[0374] Meanwhile, the data switching control signal (SSWD) is a pulse width variable signal, and accordingly, the time T2 is varied so that the brightness of the light-emitting diode (LED) can be controlled.

[0375] Meanwhile, the driving control unit (285) can turn on the discharge switching element (SWDIS) for a portion of the display period (Pd) so that the anode of the light-emitting diode (LED) is connected to the ground terminal (GND).

[0376] For example, the drive control unit (285) can control the first switching element (SWD) to be turned off from the third time point (T2) to the fifth time point (T5) during the first display period (Pd), and control the third switching element (SWDIS) to be turned on from the third time point (T3) to the fourth time point (T4) during the first display period (Pd).

[0377] Accordingly, during the first display period (Pd), from the third time point (T3) to the fourth time point (T4), current flows through the light-emitting diode (LED), the third switching element (SWDIS), and the ground terminal. Accordingly, the voltage of the anode of the light-emitting diode (LED) is rapidly discharged.

[0378] Meanwhile, the driving control unit (285) can control the turn-on period (T3-T4) of the third switching element (SWDIS) to be shorter than the turn-on period (T2-T3) of the first switching element (SWD) during the first display period (Pd). Accordingly, after the light-emitting diode (LED) has sufficiently emitted light, the voltage of the anode of the light-emitting diode (LED) can be discharged quickly.

[0379] Meanwhile, the drive control unit (285) can control the third switching element (SWDIS) to turn off from the fourth time point (T4) during the first display period (Pd). Accordingly, unnecessary power consumption of the third switching element (SWDIS) can be reduced after the discharge operation is completed. Thus, power consumption can be reduced.

[0380] Meanwhile, the drive control unit (285) can set the turn-on period (T3-T4) of the third switching element (SWDIS) based on the clock signal (GCLK).

[0381] Specifically, the driving control unit (285) can set the turn-on period (T3-T4) of the third switching element (SWDIS) based on the capacitance of the light-emitting diode (LED).

[0382] For example, the driving control unit (285) can be set so that the turn-on period (T3-T4) of the third switching element (SWDIS) increases as the capacitance of the light-emitting diode (LED) increases. Accordingly, power consumption can be adaptedly reduced based on the capacitance of the light-emitting diode (LED).

[0383] Meanwhile, the driving control unit (285) can control the second switching element (SWC) to be turned off based on the high level of the scan switching control signal (SSWC) during the second pre-charge period (Prb) after the display period (Pda).

[0384] Meanwhile, the driving control unit (285) can control the fourth switching element (SWB) to turn on based on the high level of the precharge switching control signal (SSWB) during the second precharge period (Prb) after the display period (Pda).

[0385] Meanwhile, the drive control unit (285) can control the first switching element (SWD) to be turned off based on the high level of the data switching control signal (SSWD) during the second pre-charge period (Prb) after the display period (Pda).

[0386] Meanwhile, the drive control unit (285) can control the third switching element (SWDIS) to be turned off based on the low level of the discharge control signal (SSWDIS) during the second pre-charge period (Prb) after the display period (Pda).

[0387] FIG. 13b is a diagram illustrating an example of each signal waveform from time To to time Tb during the display period (Pda).

[0388] Referring to the drawing, during the display period (Pda), the data switching control signal (SSWD) is at a high level from time To to time Ta, and may be at a low level from time Ta onwards.

[0389] For example, if the first switching element (SWD) is an N-type metal oxide semiconductor (NMOS), the first switching element (SWD) can be turned on based on the high level of the data switching control signal (SSWD) from time To to time Ta during the display period (Pda), and then turned off from time Ta onwards.

[0390] Accordingly, the current (IDa) flowing through the light-emitting diode (LED) can rise from time To, maintain a high level, and then decrease from time Ta.

[0391] Meanwhile, the drive control unit (285) can output a discharge control signal (SSWDIS) that turns on the third switching element (SWDIS) from time Ta to time Tb, which is after the turn-on period (To-Ta) of the first switching element (SWD).

[0392] In the drawing, the discharge control signal (SSWDIS) maintains a low level and then maintains a high level from time Ta to time Tb.

[0393] Accordingly, from time Ta to time Tb, current flows through the light-emitting diode (LED), the third switching element (SWDIS), and the ground terminal. Accordingly, the voltage of the anode of the light-emitting diode (LED) is rapidly discharged using the discharge switching element (SWDIS).

[0394] Meanwhile, the drive control unit (285) can set the high-level pulse width of the discharge control signal (SSWDIS) based on N clock signals (GCLK).

[0395] FIG. 13c is a diagram illustrating different examples of each signal waveform from time point Ta to time point Tb during the display period (Pda).

[0396] Referring to the drawing, during the display period (Pda), the data switching control signal (SSWD) is at a high level from time Tp to time Ta, and may be at a low level from time Ta onwards.

[0397] For example, if the first switching element (SWD) is an N-type metal oxide semiconductor (NMOS), the first switching element (SWD) can be turned on based on the high level of the data switching control signal (SSWD) from time Tp to time Ta during the display period (Pda), and then turned off from time Ta onwards.

[0398] Accordingly, the voltage (VDa) applied to the light-emitting diode (LED) can rise from time Tp and maintain a high level, and then fall from time Ta.

[0399] Meanwhile, the drive control unit (285) can output a discharge control signal (SSWDIS) that turns on the third switching element (SWDIS) from time Ta to time Tb, which is after the turn-on period (Tp-Ta) of the first switching element (SWD).

[0400] In the drawing, the discharge control signal (SSWDIS) maintains a low level and then maintains a high level from time Ta to time Tb.

[0401] Accordingly, from time Ta to time Tb, current flows through the light-emitting diode (LED), the third switching element (SWDIS), and the ground terminal. Accordingly, the voltage of the anode of the light-emitting diode (LED) is rapidly discharged using the discharge switching element (SWDIS).

[0402] Meanwhile, the drive control unit (285) can set the high-level pulse width of the discharge control signal (SSWDIS) based on N clock signals (GCLK).

[0403] According to the method of FIG. 13a to FIG. 13b, compared to the discharge method using the buffer of FIG. 10b, the buffer control signal (SEN) from the buffer (AMP) is not supplied to the light-emitting diode (LED) during the display period (Pda), so there is an advantage of not generating unnecessary power consumption.

[0404] In addition, according to the method of FIG. 13a and FIG. 13b, compared to the discharge method using floating of FIG. 11a, almost no tail current is generated after the turn-off of the light-emitting diode (LED), so there is an advantage of not generating unnecessary power consumption.

[0405] Meanwhile, an image display device (100) according to another embodiment of the present disclosure includes a panel (210) having a plurality of light-emitting diodes (LEDs) and a discharge switching element (SWDIS) disposed between the anode and the ground terminal (GND) of the light-emitting diodes (LEDs), and a driving control unit (285) that outputs a scan signal (Vscan) to the light-emitting diodes (LEDs) for each of the plurality of sub-frame periods and outputs a pulse width variable-based data signal (Vdata).

[0406] Meanwhile, the driving control unit (285) supplies a positive polarity charging voltage to the anode of the light-emitting diode (LED) during the precharge period (PRa, PRb), supplies a positive polarity data voltage based on the pulse width variable-based data signal (Vdata) during the display period (Pd), and after the supply of the data voltage ends, turns on the discharge switching element (SWDIS) to control the anode of the light-emitting diode (LED) to be connected to the ground terminal (GND). Accordingly, power consumption can be reduced. In particular, unnecessary power consumption after the light-emitting diode (LED) emits light can be reduced.

[0407] FIG. 14 illustrates another example of a pixel driving circuit according to an embodiment of the present disclosure.

[0408] Referring to the drawings, a pixel driving circuit (1400) according to an embodiment of the present disclosure comprises a red light-emitting diode (LEDR), a green light-emitting diode (LEDG), a blue light-emitting diode (LEDB), a first switching element (SWDR, SWWDG, SWDB) connected to the anode of each light-emitting diode (LEDR, LEDG, LEDB) and performing switching, a second switching element (SWCR, SWCG, SWCB) connected to the cathode of each light-emitting diode (LEDR, LEDG, LEDB), and a third switching element (SWDISR, SWDISG, SWDISB) disposed between the anode of each light-emitting diode (LEDR, LEDG, LEDB) and the ground terminal (GND).

[0409] Meanwhile, the pixel driving circuit (1400) according to an embodiment of the present disclosure may further include a fourth switching element (SWBR, SWBG, SWBB) connected to the anode of each light-emitting diode (LEDR, LEDG, LEDB) and supplying each buffer current based on a switching operation.

[0410] Meanwhile, the pixel driving circuit (1400) according to an embodiment of the present disclosure may further include a current source (ICHR, ICHG, ICHB) connected to each second switching element (SWCR, SWCG, SWCB) and outputting current to each second switching element (SWCR, SWCG, SWCB).

[0411] FIGS. 15a to 18d are drawings referenced in the description of FIG. 12 or FIG. 14.

[0412] Figure 15a is a diagram illustrating the voltage change of the light-emitting diode of Figure 12.

[0413] Referring to the drawing, a pre-charge voltage (Vpre) is supplied to the anode of the light-emitting diode (LED) based on the turn-on of the fourth switching element (SWB).

[0414] Accordingly, at the time of Tfo, the voltage (VCH) of the anode of the light-emitting diode (LED) can correspond to the pre-charge voltage (Vpre).

[0415] Meanwhile, when the first switching element (SWD) is turned on at the time of Tfo, the voltage VCH of the anode of the light-emitting diode (LED) rises sequentially and can rise to a high level VF voltage.

[0416] Meanwhile, at time Tf1, when the first switching element (SWD) is turned off, the voltage VCH of the anode of the light-emitting diode (LED) can sequentially decrease.

[0417] Meanwhile, from time Tf1 to time Tf2, when the discharge control signal (SSWDIS) is at a high level, the third switching element (SWDIS) can be turned on.

[0418] Accordingly, from time Tf1 to time Tf2, current flows through the light-emitting diode (LED), the third switching element (SWDIS), and the ground terminal. Accordingly, the voltage VCH of the anode of the light-emitting diode (LED) is rapidly discharged using the discharge switching element (SWDIS).

[0419] Meanwhile, the turn-on time (dt) of the third switching element (SWDIS) can be determined based on the difference (dV) between the high level and the low level of the anode voltage of the light-emitting diode (LED).

[0420] That is, the driving control unit (285) can set the turn-on time (dt) of the third switching element (SWDIS) based on the difference (dV) between the high level and the low level of the anode voltage of the light-emitting diode (LED).

[0421] For example, the drive control unit (285) can set the turn-on time (dt) of the third switching element (SWDIS) based on the following mathematical formula 1.

[0422] [Mathematical Formula 1]

[0423] dt=(VF-Vpre)×C / I

[0424] Here, VF is the high-level voltage of the light-emitting diode (LED), Vpre is the low-level voltage of the light-emitting diode (LED), C is the capacitance of the light-emitting diode (LED), and I is the current flowing through the light-emitting diode (LED).

[0425] FIG. 15b illustrates the data switching control signal and the discharge switching control signal of FIG. 12.

[0426] Referring to the drawing, from time Tfm to time Tfn, based on the high level of the data switching control signal, the first switching element (SWD) is turned on so that the light-emitting diode (LED) can emit light.

[0427] Meanwhile, after the Tfn time, based on the low level of the data switching control signal, the first switching element (SWD) is turned off, and the light-emitting diode (LED) does not emit light.

[0428] Meanwhile, from time Tfn to time Tf0, the third switching element (SWDIS) can be turned on based on the high level of the discharge switching control signal (SSWDIS).

[0429] Accordingly, from time Tfn to time Tf0, current flows through the light-emitting diode (LED), the third switching element (SWDIS), and the ground terminal. Accordingly, the voltage of the anode of the light-emitting diode (LED) is rapidly discharged using the discharge switching element (SWDIS).

[0430] Meanwhile, the drive control unit (285) can set the high-level pulse width of the discharge switching control signal (SSWDIS) based on n clock signals (GCLK).

[0431] FIG. 16a is a diagram illustrating an example of the voltage change of each light-emitting diode in FIG. 14.

[0432] Referring to the drawing, the driving control unit (285) can control the output of a voltage of a first level (LV1) to a red light-emitting diode (LEDR) during the precharge period (PRa, PRb), a voltage of a second level (LV2) higher than the first level (LV1) to a green light-emitting diode (LEDG), and a voltage of a third level (LV3) higher than the second level (LV2) to a blue light-emitting diode (LEDB).

[0433] For example, different levels of pre-charge voltage (Vpre) are supplied to the anodes of each light-emitting diode (LEDR, LEDG, LEDB) of FIG. 14 based on the turn-on of each fourth switching element (SWBR, SWBG, SWBB).

[0434] In the drawing, as a pre-charge voltage (Vpre), a voltage of the first level (LV1) is supplied to a red light-emitting diode (LEDR), a voltage of the second level (LV2) which is higher than the first level (LV1) is supplied to a green light-emitting diode (LEDG), and a voltage of the third level (LV3) which is higher than the second level (LV2) is supplied to a blue light-emitting diode (LEDB).

[0435] Meanwhile, at the time of Tgo, when each first switching element (SWDR, SWDG, SWDB) is turned on, the voltage of the anode of each light-emitting diode (LEDR, LEDG, LEDB) rises sequentially and can rise to each high level voltage.

[0436] For example, the driving control unit (285) can control to output a voltage of a fourth level (LV4) higher than a first level (LV1) to a red light-emitting diode (LEDR), output a voltage of a fifth level (LV5) higher than a fourth level (LV4) to a green light-emitting diode (LEDG), and output a voltage of a sixth level (LV6) higher than a fifth level (LV5) to a blue light-emitting diode (LEDB) during the display period (Pd).

[0437] Meanwhile, from time Tgo to time Tg1, each light-emitting diode (LEDR, LEDG, LEDB) emits light.

[0438] Meanwhile, at time Tg1, when each first switching element (SWDR, SWWDG, SWDB) is turned off, the anode voltage (VRa, VGa, VBa) of each light-emitting diode (LEDR, LEDG, LEDB) can sequentially decrease.

[0439] Meanwhile, the driving control unit (285) can be set so that when the capacitance of the green light-emitting diode (LEDG) or the blue light-emitting diode (LEDB) is greater than the capacitance of the red light-emitting diode (LEDR), the turn-on period (Tg1-Tg3) of the third switching element (SWDISG, SWDISB) of the green light-emitting diode (LEDG) or the blue light-emitting diode (LEDB) is greater than the turn-on period (Tg1-Tg2) of the third switching element (SWDISR) of the red light-emitting diode (LEDR).

[0440] For example, the driving control unit (285) can control the third switching element (SWDISR) to turn on based on the high level of the red discharge control signal (SSWDISR) from time Tg1 to time Tg2.

[0441] Accordingly, from time Tg1 to time Tg2, current flows through the red light-emitting diode (LEDR), the third switching element (SWDISR), and the ground terminal. Accordingly, the voltage (VRa) of the anode of the red light-emitting diode (LEDR) is rapidly discharged using the discharge switching element (SWDISR).

[0442] Meanwhile, the drive control unit (285) can control the third switching element (SWDISG) to turn on based on the high level of the green discharge control signal (SSWDISG) from time Tg1 to time Tg3.

[0443] Accordingly, from time Tg1 to time Tg3, current flows through the green light-emitting diode (LEDG), the third switching element (SWDISG), and the ground terminal. Accordingly, the voltage (VGa) of the anode of the green light-emitting diode (LEDG) is rapidly discharged using the discharge switching element (SWDISG).

[0444] Meanwhile, the driving control unit (285) can control the third switching element (SWDISB) to turn on based on the high level of the blue discharge control signal (SSWDISB) from time Tg1 to time Tg3.

[0445] Accordingly, from time Tg1 to time Tg3, current flows through the blue light-emitting diode (LEDB), the third switching element (SWDISB), and the ground terminal. Accordingly, the voltage (VBa) of the anode of the blue light-emitting diode (LEDB) is rapidly discharged using the discharge switching element (SWDISB).

[0446] FIG. 16b is a diagram illustrating the low level and high level voltages of the anode voltage of each light-emitting diode (LEDR, LEDG, LEDB) of FIG. 16a.

[0447] Referring to the drawing, the low level or precharge voltage level of the anode voltage of each light-emitting diode (LEDR, LEDG, LEDB) may be approximately 0.7V, 1.8V, and 2V.

[0448] The high level of the anode voltage of each light-emitting diode (LEDR, LEDG, LEDB) can be approximately 1.9V, 2.5V, and 2.7V.

[0449] Meanwhile, the capacitance of each light-emitting diode (LEDR, LEDG, LEDB) may be greater in the case of a green light-emitting diode (LEDG) or a blue light-emitting diode (LEDB) than in the case of a red light-emitting diode (LEDR).

[0450]

[0451] * Accordingly, the driving control unit (285) can set the turn-on period of the third switching element (SWDISR) of the red light-emitting diode (LEDR) to twice the clock signal (GCLK), and the turn-on period of the third switching element (SWDISG, SWDISB) of the green light-emitting diode (LEDG) or blue light-emitting diode (LEDB) to four times the clock signal (GCLK). Accordingly, the third switching element (SWDIS) can be adaptedly operated based on the coffee-saturn of the light-emitting diode (LED). Consequently, power consumption can be reduced.

[0452] FIG. 16c is a diagram illustrating another example of the voltage change of each light-emitting diode in FIG. 14.

[0453] Referring to the drawing, the driving control unit (285) can control the output of a voltage of a first level (LV1) to a red light-emitting diode (LEDR) during the precharge period (PRa, PRb), a voltage of a second level (LV2) higher than the first level (LV1) to a green light-emitting diode (LEDG), and a voltage of a third level (LV3) higher than the second level (LV2) to a blue light-emitting diode (LEDB).

[0454] For example, different levels of pre-charge voltage (Vpre) are supplied to the anodes of each light-emitting diode (LEDR, LEDG, LEDB) of FIG. 14 based on the turn-on of each fourth switching element (SWBR, SWBG, SWBB).

[0455] Meanwhile, at the time of Tho, when each first switching element (SWDR, SWDG, SWDB) is turned on, the voltage of the anode of each light-emitting diode (LEDR, LEDG, LEDB) rises sequentially and can rise to each high level voltage.

[0456] For example, the driving control unit (285) can control to output a voltage of a fourth level (LV4) higher than a first level (LV1) to a red light-emitting diode (LEDR), output a voltage of a fifth level (LV5) higher than a fourth level (LV4) to a green light-emitting diode (LEDG), and output a voltage of a sixth level (LV6) higher than a fifth level (LV5) to a blue light-emitting diode (LEDB) during the display period (Pd).

[0457] Meanwhile, from time Tho to time Th1, each light-emitting diode (LEDR, LEDG, LEDB) emits light.

[0458] Meanwhile, at time Th1, when each first switching element (SWDR, SWDG, SWDB) is turned off, the anode voltage (VRa, VGa, VBa) of each light-emitting diode (LEDR, LEDG, LEDB) can sequentially decrease.

[0459] Meanwhile, the driving control unit (285) can be set so that the turn-on period of the third switching element (SWDISG, SWDISB) increases in the order of the red light-emitting diode (LEDR), green light-emitting diode (LEDG), and blue light-emitting diode (LEDB).

[0460] For example, the driving control unit (285) can control the third switching element (SWDISR) to turn on based on the high level of the red discharge control signal (SSWDISR) from time Th1 to time Th2.

[0461] Accordingly, from time Th1 to time Th2, current flows through the red light-emitting diode (LEDR), the third switching element (SWDISR), and the ground terminal. Accordingly, the voltage (VRa) of the anode of the red light-emitting diode (LEDR) is rapidly discharged using the discharge switching element (SWDISR).

[0462] Meanwhile, the driving control unit (285) can control the third switching element (SWDISG) to turn on based on the high level of the green discharge control signal (SSWDISG) from time Th1 to time Th3.

[0463] Accordingly, from time Th1 to time Th3, current flows through the green light-emitting diode (LEDG), the third switching element (SWDISG), and the ground terminal. Accordingly, the voltage (VGa) of the anode of the green light-emitting diode (LEDG) is rapidly discharged using the discharge switching element (SWDISG).

[0464] Meanwhile, the driving control unit (285) can control the third switching element (SWDISB) to turn on based on the high level of the blue discharge control signal (SSWDISB) from time Th1 to time Th4.

[0465] Accordingly, from time Th1 to time Th4, current flows through the blue light-emitting diode (LEDB), the third switching element (SWDISB), and the ground terminal. Accordingly, the voltage (VBa) of the anode of the blue light-emitting diode (LEDB) is rapidly discharged using the discharge switching element (SWDISB).

[0466] FIG. 16d is a diagram illustrating the low level and high level voltages of the anode voltage of each light-emitting diode (LEDR, LEDG, LEDB) of FIG. 16c.

[0467] Referring to the drawing, the low level or precharge voltage level of the anode voltage of each light-emitting diode (LEDR, LEDG, LEDB) may be approximately 0.7V, 1.8V, and 2V.

[0468] The high level of the anode voltage of each light-emitting diode (LEDR, LEDG, LEDB) can be approximately 1.9V, 2.5V, and 2.7V.

[0469] Meanwhile, the capacitance of each light-emitting diode (LEDR, LEDG, LEDB) can increase in the order of red light-emitting diode (LEDR), green light-emitting diode (LEDG), and blue light-emitting diode (LEDB).

[0470] Accordingly, the driving control unit (285) can set the turn-on period of the third switching element (SWDISR) of the red light-emitting diode (LEDR) to twice the clock signal (GCLK), set the turn-on period of the third switching element (SWDISG) of the green light-emitting diode (LEDG) to four times the clock signal (GCLK), and set the turn-on period of the third switching element (SWDISB) of the blue light-emitting diode (LEDB) to five times the clock signal (GCLK). Accordingly, the third switching element (SWDIS) can be adaptedly operated based on the coffee-saturn of the light-emitting diode (LED). Consequently, power consumption can be reduced.

[0471] Figure 17a illustrates the brightness according to the gradation of a light-emitting diode (LED) when the discharge of the anode voltage of the light-emitting diode (LED) is in a floating manner.

[0472] Referring to the drawing, when the pulse width of a pulse width variable-based data signal or a data switching control signal is sequentially increased from 1 to 10, the brightness of each light-emitting diode (LEDR, LEDG, LEDB) can be shown as in FIG. 17a.

[0473] The shaded area in Fig. 17a represents an area where the luminance (nit) relative to the pulse width of the data switching control signal exceeds a multiple of the reference luminance of 0.01 nit.

[0474] That is, the shaded area in Fig. 17a represents an area exceeding the reference brightness based on the tail current (ARn) in Fig. 11b.

[0475] According to this, when the pulse width of a pulse width variable-based data signal or a data switching control signal is 1, the red light-emitting diode (LEDR) and the blue light-emitting diode (LEDB) normally output brightness corresponding to the pulse width, but the green light-emitting diode (LEDG) outputs brightness much greater than the pulse width. Therefore, due to the discharge by the floating method, low-gradation expression capability is deteriorated, and furthermore, power consumption becomes significant.

[0476] Figure 17b illustrates the brightness according to the gradation of a light-emitting diode (LED) when the discharge of the anode voltage of the light-emitting diode (LED) is in an amplifier mode.

[0477] Referring to the drawing, when the pulse width of a pulse width variable-based data signal or a data switching control signal is sequentially increased from 1 to 10, the brightness of each light-emitting diode (LEDR, LEDG, LEDB) can be shown as in FIG. 17b.

[0478] The shaded area in Fig. 17b represents an area where the luminance (nit) exceeds a multiple of the reference luminance of 0.01 nit in relation to the pulse width of the data switching control signal.

[0479] That is, the shaded area in Fig. 17b represents an area exceeding the reference luminance based on the tail current (ARm) in Fig. 10c.

[0480] According to this, when the pulse width of the pulse width variable-based data signal or data switching control signal is 1, each light-emitting diode (LEDR, LEDG, LEDB) normally outputs brightness corresponding to the pulse width, but when the pulse width is 2, the green light-emitting diode (LEDG) outputs brightness much greater than the pulse width. Therefore, according to the discharge by the amplifier method, low-gradation expression capability is deteriorated, and furthermore, power consumption becomes significant.

[0481] FIG. 17c illustrates the brightness according to the gradation of a light-emitting diode (LED) when the discharge of the anode voltage of the light-emitting diode is a discharge switching element according to an embodiment of the present disclosure.

[0482] Referring to the drawing, when the pulse width of a pulse width variable-based data signal or a data switching control signal is sequentially increased from 1 to 10, the brightness of each light-emitting diode (LEDR, LEDG, LEDB) can be shown as in FIG. 17c.

[0483] The shaded area in Fig. 17c represents an area where the luminance (nit) relative to the pulse width of the data switching control signal exceeds a multiple of the reference luminance of 0.01 nit.

[0484] That is, the shaded area in Fig. 17c represents an area exceeding the reference luminance, and the unshaded area represents an area corresponding to the reference luminance.

[0485] According to this, when the pulse width of a pulse width variable-based data signal or a data switching control signal is 1 to 3, each light-emitting diode (LEDR, LEDG, LEDB) can normally output brightness corresponding to the pulse width.

[0486] Accordingly, when performing a discharge of a light-emitting diode using a discharge switching element according to an embodiment of the present disclosure, power consumption can be reduced while maintaining expressive power at low grayscale levels.

[0487] Meanwhile, when charging the anode voltage of a light-emitting diode (LED), a transient period occurs during which the anode voltage rises. Below, the pulse width of the data switching control signal (SSWD) and the transient period are compared and explained.

[0488] FIG. 18a illustrates the waveforms, etc., when the pulse width of the data switching control signal (SSWD) is greater than the transient period.

[0489] Referring to the drawing, during the first precharge period (PRa), the anode voltage of the light-emitting diode (LED) is precharged to the precharge voltage (Vprecharge).

[0490] Next, during the first display period (Pd), from time Tp1 to time Tp2, when the first switching element (SWD) is turned on based on the pulse width of the data switching control signal (SSWD), the anode voltage rises sequentially and rises to a high level voltage (Vforward).

[0491] Next, when the first switching element (SWD) is turned off from time Tp2, the anode voltage of the light-emitting diode (LED) decreases.

[0492] At this time, from time Tp2 to time Tp3, based on the high level of the discharge control signal (SSWDISa), the third switching element (SWDIS) is turned on, and the anode voltage of the light-emitting diode (LED) rapidly drops to the precharge voltage (Vprecharge).

[0493] Meanwhile, the buffer control signal (SSENa) may be at a low level from time Tp1, which is the first indication period (Pd), to time TP4.

[0494] As shown in FIG. 18a, since the pulse width (Tp1~Tp2) of the data switching control signal (SSWD) is greater than the transient period in which the anode voltage rises sequentially, it is preferable that the high-level discharge control signal (SSWDISa) be supplied from the time point TP2 onwards.

[0495] FIG. 18b illustrates an example of each waveform when the pulse width of the data switching control signal (SSWD) is smaller than the transient period.

[0496] Referring to the drawing, during the first precharge period (PRa), the anode voltage of the light-emitting diode (LED) is precharged to the precharge voltage (Vprecharge).

[0497] Next, during the first display period (Pd), from time Tk1 to time Tk2, when the first switching element (SWD) is turned on based on the pulse width of the data switching control signal (SSWD), the anode voltage rises sequentially.

[0498] Meanwhile, while the anode voltage is rising sequentially, if the first switching element (SWD) is turned off from time Tk2, the anode voltage of the light-emitting diode (LED) decreases.

[0499] At this time, from time Tk2 to time Tk3, based on the high level of the discharge control signal (SSWDISa), the third switching element (SWDIS) is turned on, and the anode voltage of the light-emitting diode (LED) rapidly drops to a voltage level lower than the precharge voltage (Vprecharge).

[0500] Meanwhile, at Tk4, which is the end point of the first display period (Pd), the anode voltage of the light-emitting diode (LED) is at a level lower than the precharge voltage (Vprecharge). Therefore, during the second precharge period (PRb), separate power is consumed to raise the anode voltage of the light-emitting diode (LED) to the precharge voltage (Vprecharge).

[0501] FIG. 18c illustrates another example of each waveform when the pulse width of the data switching control signal (SSWD) is smaller than the transient period.

[0502] Referring to the drawing, during the first precharge period (PRa), the anode voltage of the light-emitting diode (LED) is precharged to the precharge voltage (Vprecharge).

[0503] Next, during the first display period (Pd), from time point Tr1 to time point Tr2, when the first switching element (SWD) is turned on based on the pulse width of the data switching control signal (SSWD), the anode voltage rises sequentially.

[0504] Meanwhile, while the anode voltage is rising sequentially, if the first switching element (SWD) is turned off from time Tr2, the anode voltage of the light-emitting diode (LED) decreases.

[0505] Meanwhile, a driving control unit (285) according to one embodiment of the present disclosure can control the anode voltage of a light-emitting diode (LED) to drop to a precharge voltage (Vprecharge) by varying the pulse width of the high level of the discharge control signal (SSWDIS) when the first switching element (SWD) is turned off while the anode voltage of the light-emitting diode (LED) has not risen to a high level.

[0506] That is, the driving control unit (285) according to one embodiment of the present disclosure can control the high-level pulse width of the discharge control signal (SSWDIS) to become smaller as the difference in the high-level anode voltage of the light-emitting diode (LED) increases.

[0507] For example, from time point Tr2 to time point Tr3, based on the high level of the discharge control signal (SSWDISa), the third switching element (SWDIS) is turned on, and the anode voltage of the light-emitting diode (LED) is rapidly lowered to the precharge voltage (Vprecharge).

[0508] At this time, it is preferable that the high-level pulse width (Tr2-Tr3) of the discharge control signal (SSWDISa) is smaller than the pulse width (Tk2-Tk3) of FIG. 18b.

[0509] Meanwhile, since the anode voltage of the light-emitting diode (LED) is the precharge voltage (Vprecharge) at Tr4, which is the end point of the first display period (Pd), it is not necessary to raise the anode voltage of the light-emitting diode (LED) to the precharge voltage (Vprecharge) during the second precharge period (PRb), so no separate power is consumed.

[0510] FIG. 18d is a diagram comparing cases where the pulse width of the data switching control signal (SSWD) is larger than the transient period and cases where it is smaller.

[0511] Referring to the drawing, Gra illustrates the anode voltage waveform of a light-emitting diode (LED) when the pulse width (Ts1~TS4) of the data switching control signal (SSWD) is greater than the transient period (Ts1~Ts3).

[0512] In response to this, the drive control unit (285) can output a discharge control signal (SSWDIS) such as GRb. At this time, it is preferable that the high-level pulse width (Ts4~Ts5) of the discharge control signal (SSWDIS) is smaller than the transient interval (Ts1~Ts3).

[0513] Grc exemplifies the anode voltage waveform of a light-emitting diode (LED) when the pulse width (Ts1~TS2) of the data switching control signal (SSWD) is smaller than or equal to the transient period.

[0514] In response to this, the drive control unit (285) can output a discharge control signal (SSWDIS) such as GRd. At this time, it is preferable that the high-level pulse width (2×GCLK) of the discharge control signal (SSWDIS) is smaller than the transient interval (5×GCLK).

[0515] Although preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present disclosure.

Claims

1. Light-emitting diode; A first switching element connected to the anode of the light-emitting diode and performing switching; A second switching element connected to the cathode of the light-emitting diode; A third switching element disposed between the anode and the ground terminal of the light-emitting diode above; A driving control unit that outputs a scan signal to the second switching element for each of a plurality of sub-frame periods and outputs a data signal based on the pulse width variation of the first switching element; The above drive control unit is, An image display device that outputs a discharge control signal to turn on the third switching element after the turn-on period of the first switching element based on the data signal.

2. In Paragraph 1, A fourth switching element connected to the anode of the light-emitting diode and supplying a buffer current based on a switching operation; further comprising The above drive control unit is, An image display device that outputs a discharge control signal to turn on the third switching element during the off period of the fourth switching element.

3. In Paragraph 2, The above drive control unit is, During the precharge period, the fourth switching element is turned on, and An image display device that turns off the fourth switching element during the display period.

4. In Paragraph 1, The above drive control unit is, Controlling the second switching element to turn on during the first display period from the first point in time during the first precharge period, and Controls the first switching element to turn on from the second point in time to the third point in time during the first display period, and An image display device that controls the third switching element to turn on from the third point in time to the fourth point in time during the first display period.

5. In Paragraph 4, The above drive control unit is, An image display device that controls the turn-on period of the third switching element to be smaller than the turn-on period of the first switching element during the first display period.

6. In Paragraph 4, The above drive control unit is, An image display device that controls the third switching element to turn off from the fourth point in time during the first display period.

7. In Paragraph 1, The above drive control unit is, An image display device that sets the turn-on period of the third switching element based on a clock signal.

8. In Paragraph 1, The above drive control unit is, An image display device that sets the turn-on period of the third switching element based on the capacitance of the light-emitting diode.

9. In Paragraph 8, The above drive control unit is, An image display device configured such that the turn-on period of the third switching element increases as the capacitance of the light-emitting diode increases.

10. In Paragraph 1, The above drive control unit is, If the capacitance of the above light-emitting diode is greater when it is a green light-emitting diode or a blue light-emitting diode than when it is a red light-emitting diode, An image display device configured such that the turn-on period of the third switching element of the green light-emitting diode or the blue light-emitting diode is greater than the turn-on period of the third switching element of the red light-emitting diode.

11. In Paragraph 1, The above drive control unit is, When the capacitance of the above light-emitting diodes increases in the order of red light-emitting diode, green light-emitting diode, and blue light-emitting diode, An image display device configured such that the turn-on period of the third switching element becomes larger in the order of the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode.

12. In Paragraph 1, The above drive control unit is, During the precharge period, Output a first level voltage to a red light-emitting diode, and Output a second level voltage higher than the first level to a green light-emitting diode, and An image display device that controls the output of a third level voltage higher than the second level to a blue light-emitting diode.

13. In Paragraph 12, The above drive control unit is, During the display period, Outputting a fourth level voltage higher than the first level to the red light-emitting diode, and Outputting a fifth level voltage higher than the fourth level to the green light-emitting diode, and An image display device that controls the output of a sixth level voltage higher than the fifth level to the blue light-emitting diode.

14. A panel comprising a plurality of light-emitting diodes and a discharge switching element disposed between the anode and the ground terminal of the light-emitting diodes; The above light-emitting diode includes a driving control unit that outputs a scan signal for each of a plurality of sub-frame periods and outputs a pulse width variable-based data signal. The above drive control unit is, During the precharge period, a positive polarity charging voltage is supplied to the anode of the light-emitting diode, and During the display period, based on the data signal based on the pulse width variation, a positive polarity data voltage is supplied, and An image display device that controls the discharge switching element to turn on after the supply of the above data voltage ends, so that the anode of the light-emitting diode is connected to the ground terminal.

15. In Paragraph 14, The above drive control unit is, An image display device that controls the discharge switching element to turn on during a portion of the above display period so that the anode of the light-emitting diode is connected to the ground terminal.

16. In Paragraph 14, The above drive control unit is, An image display device that sets the turn-on period of the discharge switching element based on the capacitance of the light-emitting diode.

17. In Paragraph 14, The above drive control unit is, If the capacitance of the above light-emitting diode is greater when it is a green light-emitting diode or a blue light-emitting diode than when it is a red light-emitting diode, An image display device configured such that the turn-on period of the discharge switching element of the green light-emitting diode or the blue light-emitting diode is greater than that of the red light-emitting diode.

18. In Paragraph 14, The above drive control unit is, When the capacitance of the above light-emitting diodes increases in the order of red light-emitting diode, green light-emitting diode, and blue light-emitting diode, An image display device configured such that the turn-on period of the discharge switching element becomes larger in the order of the red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode.

19. Includes a plurality of image display devices; and The above image display device is, A video wall comprising a video display device according to any one of paragraphs 1 through 18.

Images