KR20220000760A - Display device and operating method for the same - Google Patents

Abstract

Disclosed is a display device which comprises: a display including a plurality of LEDs corresponding to a plurality of scan lines; and a display driving unit controlling the operation of the plurality of LEDs for each scan line. The display driving unit turns on only LEDs corresponding to a first group of scan lines from among a plurality of groups in which the plurality of scan lines are divided in order, for a first sub-frame period of a plurality of sub-frame periods included in a frame period displaying one frame, and turns on only LEDs corresponding to a second group of scan lines from among the plurality of groups, for a second sub-frame period of the plurality of sub-frame periods.

Description

Display device and operating method for the same

Various embodiments relate to a display device and an operating method thereof, and more particularly, to a display device for driving pixels included in a display in a passive matrix manner, and an operating method thereof.

With the recent development of electronic technology, various types of display devices are being developed and distributed, and the demand for large-sized display devices is increasing. In addition, display devices providing ultra-high resolution such as 4K resolution and 8K resolution are increasing.

Meanwhile, when driving pixels included in a display in a passive matrix method, a driver IC for driving a plurality of scan lines and a plurality of channels is required. When the number of pixels increases, the number of driver ICs increases. When the number of driver ICs increases, material cost and power consumption increase accordingly. In order to reduce material cost and power consumption, it is necessary to increase the number of scan lines driven by one driver IC. On the other hand, when the number of scan lines increases, there is a problem in that the maximum brightness of the pixel decreases due to the characteristics of the passive matrix driving method.

Various embodiments may provide a display device that does not decrease the maximum brightness of a pixel even if the number of scan lines switched in one driver IC is increased when driving in a passive matrix manner, and an operating method thereof.

A display device according to an embodiment includes a display including a plurality of LEDs corresponding to a plurality of scan lines, and a display driver controlling an operation of the plurality of LEDs for each scan line, wherein the display driver includes: An LED corresponding to the scan lines of the first group among a plurality of groups in which the plurality of scan lines are sequentially divided during a first sub frame period among a plurality of sub frame periods included in a frame period displaying one frame only LEDs may be turned on, and only LEDs corresponding to the scan lines of the second group among the plurality of groups may be turned on during a second subframe period among the plurality of subframe periods.

A plurality of LEDs according to an embodiment are arranged in a matrix form to be positioned at points where the plurality of scan lines and a plurality of channels intersect, and each of the plurality of LEDs is formed by one scan line and one channel. The operation may be controlled.

The display driving unit according to an embodiment may include a scan control unit that switches each of the plurality of scan lines to control an operation of the plurality of LEDs for each scan line, and based on the brightness of each of the LEDs, the plurality of It may include a channel control unit for supplying power to the channels of.

The channel controller according to an embodiment, based on the brightness of each of the LEDs, determines a PWM duty, and a PWM generator that generates a PWM signal according to the determined PWM duty, and converts the PWM signal into a current and a current generator configured to convert the LEDs, control the magnitude of the current based on the brightness of each of the LEDs, and supply the current to the plurality of channels.

The luminous efficiency of the plurality of LEDs according to an embodiment may decrease as the switching time by the scan controller increases, and the switching time may decrease as the number of the plurality of groups increases.

The scan lines according to an embodiment may be divided into the first group and the second group, and the order of scan lines in the first group may be odd, and the order of scan lines in the second group may be even.

The display driver according to an embodiment may turn on only LEDs corresponding to the scan lines of the first group during a third sub-frame period among the plurality of sub-frame periods, and a fourth sub-frame among the plurality of sub-frame periods During the frame period, only LEDs corresponding to the scan lines of the second group among the plurality of groups may be turned on.

The display driver according to an embodiment may turn on only 1/2 of the LEDs of the plurality of LEDs during one of the plurality of sub-frame periods.

The scan lines according to an embodiment are divided into the first group, the second group, the third group, and the fourth group, and the display driver may include the display driver during a third subframe period among the plurality of subframe periods. Only the LEDs corresponding to the scan lines of the third group are turned on, and only the LEDs corresponding to the scan lines of the fourth group are turned on during the fourth sub-frame period among the plurality of sub-frame periods. can

The scan lines included in the first group according to an embodiment have an index indicating the order of the scan lines of 4n (n=0, 1, 2, ..., k), and the scan lines included in the second group are scan lines The index indicating the order of n is 4n+1 (n=0, 1, 2, ..., k), and the scan lines included in the third group have an index indicating the order of the scan lines of 4n+2 (n=0, k). 1, 2,..., k), and the scan lines included in the fourth group may have an index indicating the order of the scan lines of 4n+3 (n=0, 1, 2,..., k).

The display driver according to an embodiment may turn on only 1/4 of the LEDs among the plurality of LEDs during one of the plurality of sub-frame periods.

According to an exemplary embodiment, in a method of operating a display apparatus including a plurality of LEDs corresponding to a plurality of scan lines, during a first sub-frame period among a plurality of sub-frame periods included in a frame period displaying one frame , turning on only LEDs corresponding to scan lines included in a first group among a plurality of groups divided in order of the plurality of scan lines, and during a second sub frame period among the plurality of sub frame periods The method may include turning on only LEDs corresponding to the scan lines of the second group among the plurality of groups.

The display device according to an exemplary embodiment may prevent a decrease in luminous efficiency of pixels even if the number of scan lines is increased when the display is driven in a passive matrix manner. Accordingly, it is possible to prevent a decrease in the maximum brightness of a pixel even when the number of scan lines is increased.

Accordingly, it is possible to prevent an increase in material cost and power consumption in configuring a large-sized display or a display providing ultra-high resolution.

1 is a diagram illustrating a display device according to an exemplary embodiment.
2 is a block diagram illustrating a configuration of a display apparatus according to an exemplary embodiment.
3 is a diagram referenced to describe an operation of a display driver according to an exemplary embodiment.
4 is a diagram illustrating a form in which pixels included in a display module emit light when the display driver operates in a general scramble mode.
5 is a diagram illustrating a form in which a display module emits light when a display driver operates in a dual scramble mode according to an exemplary embodiment.
6 is a diagram illustrating a form in which a display module emits light when a display driver operates in a quad scramble mode according to an exemplary embodiment.
7 is a flowchart illustrating a method of operating a display apparatus according to an exemplary embodiment.
8 is a flowchart illustrating an operation method when a display apparatus operates in a dual scramble mode according to an exemplary embodiment.
9 is a flowchart illustrating an operation method when a display apparatus operates in a dual scramble mode according to an exemplary embodiment.

Terms used in this specification will be briefly described, and the present invention will be described in detail.

The terms used in the present invention have been selected as currently widely used general terms as possible while considering the functions in the present invention, but these may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technology, and the like. In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than the name of a simple term.

In the entire specification, when a part "includes" a certain element, this means that other elements may be further included, rather than excluding other elements, unless otherwise stated. In addition, terms such as "...unit" and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software. .

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

In the embodiment of the present specification, the term “user” means a person who controls a system, function, or operation, and may include a developer, an administrator, or an installer.

1 is a diagram illustrating a display device according to an exemplary embodiment.

The display apparatus 100 according to an embodiment may be a TV, but this is only an embodiment and may be implemented in various forms including a display. For example, the display device 100 may be a mobile phone, a tablet PC, a digital camera, a camcorder, a laptop computer, a tablet PC, a desktop, an e-book terminal, a digital broadcasting terminal, a personal digital assistant (PDA), or a portable computer (PMP). Multimedia Player), a navigation system, an MP3 player, and a wearable device may be implemented as various electronic devices. In particular, the embodiments may be easily implemented in a display device having a large display, such as a signage or a TV, but is not limited thereto. Also, the display apparatus 100 may be of a fixed type or a mobile type, and may be a digital broadcasting receiver capable of receiving digital broadcasting.

The display device 100 may be implemented not only as a flat display device, but also as a curved display device that is a screen having a curvature or a flexible display device with an adjustable curvature. The output resolution of the display apparatus 100 may include, for example, a resolution higher than that of High Definition (HD), Full HD, Ultra HD, or Ultra HD.

The display apparatus 100 according to an embodiment may include the display 130 , and the display 130 may be implemented as one display module 131 or may be implemented in a form in which a plurality of display modules are physically connected. can

The display module 131 may include a plurality of pixels arranged in a matrix form. For example, the display module 131 includes a plurality of scan lines and a plurality of channels, and the plurality of scan lines extend in a horizontal direction, and the plurality of channels cross the plurality of scan lines in a vertical direction. has been extended One scan line and one channel are connected to one pixel.

In addition, the display module 131 may include an LED module in which each of the plurality of pixels is implemented as an LED pixel, but is not limited thereto.

Also, the display module 131 according to an embodiment may operate in a passive matrix method.

The passive matrix method is a method of driving all one scan line, and refers to a method of sequentially driving a plurality of scan lines. For example, when at least one scan line is selected from among a plurality of scan lines in a horizontal direction, data may be applied to pixels included in the selected scan line using vertical channels. The passive matrix method will be described later in detail with reference to FIG. 3 .

2 is a block diagram illustrating a configuration of a display apparatus according to an exemplary embodiment.

The display apparatus 100 according to an embodiment may include a processor 110 , a display driver 120 , a display 130 , and a memory 140 .

The processor 110 controls the overall operation of the display apparatus 100 and a signal flow between durable components of the display apparatus 100 , and performs a function of processing data.

The processor 110 may include a single core, a dual core, a triple core, a quad core, and multiple cores thereof. Also, the processor 110 may include a plurality of processors. For example, the processor 110 may be implemented as a main processor (not shown) and a sub processor (not shown) operating in a sleep mode.

The memory 140 according to an embodiment may store various data, programs, or applications for driving and controlling the display apparatus 100 .

Also, a program stored in the memory 140 may include one or more instructions. A program (one or more instructions) or an application stored in the memory 140 may be executed by the processor 110 .

The processor 110 according to an embodiment may process video data. The processor 110 may include a video decoder that performs decoding on video data, and may perform various image processing on the video data, such as scaling, noise filtering, frame rate conversion, resolution conversion, and the like. The processed video data may be displayed on the display 130 .

In addition, the processor 110 may generate a screen including various objects such as icons, images, and texts by using the operation unit and the rendering unit. The operation unit calculates attribute values such as coordinate values, shape, size, color, etc. of each object to be displayed according to the layout of the screen by using the user input received by the display apparatus 100 . The rendering unit generates screens of various layouts including objects based on the attribute values calculated by the operation unit. The screen generated by the rendering unit may be displayed on the display 130 .

The display driver 120 according to an embodiment may convert an image signal, a video signal, a data signal, an OSD signal, a control signal, etc. processed by the processor 110 to generate a driving signal for operating the display 130 . have. The display driver 120 will be described later in detail with reference to FIG. 3 .

The display 130 according to an embodiment may be implemented as a PDP, LCD, OLED, flexible display, etc., and may also be implemented as a 3D display. Also, the display 140 may be configured as a touch screen and used as an input device in addition to an output device.

Also, the display 130 according to an embodiment may be implemented as one display module or a form in which a plurality of display modules are physically connected. The display module may include a plurality of pixels arranged in a matrix form. For example, the display module may include an LED module in which each of a plurality of pixels is implemented as an LED pixel. However, the present invention is not limited thereto.

Each of the plurality of pixels included in the display module may operate according to a signal output from the display driver 120 .

Meanwhile, a block diagram of the display apparatus 100 illustrated in FIG. 2 is a block diagram for an exemplary embodiment. Each component in the block diagram may be integrated, added, or omitted according to the specifications of the actually implemented display device 100 . That is, two or more components may be combined into one component, or one component may be subdivided into two or more components as needed. In addition, the function performed in each block is for describing the embodiments, and the specific operation or device does not limit the scope of the present invention.

3 is a diagram referenced to describe an operation of a display driver according to an exemplary embodiment.

Referring to FIG. 3 , the display driver 120 according to an embodiment may include a signal controller 210 , a scan controller 220 , and a channel controller 230 .

The signal control unit 210 according to an embodiment may include a frame storage unit, and when video data is input to the signal control unit 210 , the video data may be stored in the frame storage unit for each frame.

The signal controller 210 may transmit scramble mode information to the scan controller 220 . The scramble mode information may include information on how many sub-frame sections one frame section is divided into, information on a ratio of pixels to emit light among all pixels during one sub-frame section, and the like. The scan controller 220 may control a plurality of scan lines based on the scramble mode information. The scan controller 220 may switch the plurality of pixels to be turned on/off for each scan line. At this time, the scan control unit 220 determines scan lines for which switches are to be turned on based on the scramble mode information, and in the determined scan lines, the order of turning on the switches and turning on the switches You can control the time.

According to the scramble mode, the scan control unit 220 according to an embodiment may control only some pixels among all pixels to emit light during one sub-frame period. For example, when operating in the dual scramble mode, the scan controller 220 may control to emit light of only 1/2 of all pixels during one subframe period. The scan controller 220 may determine the switching order according to the order in which the scan lines are arranged. The scan control unit 220 may control each of the even-numbered scan lines to be sequentially turned on during one sub-frame period, and each of the odd-numbered scan lines may be sequentially turned on during the other sub-frame period. ) can be controlled.

When operating in the quad scramble mode, the scan controller 220 may control only 1/4 of all pixels to emit light during one subframe period. When operating in the quad scramble mode, the plurality of scan lines may be divided into four groups (first to fourth groups), and the scan controller 220 controls the scan lines of the first group during the first subframe period. Each may be controlled to be sequentially turned on, each of the scan lines of the second group is controlled to be sequentially turned on during the second sub-frame period, and each of the scan lines of the third group is sequentially turned on during the third sub-frame period It is controlled to be turned on, and each of the scan lines of the fourth group can be sequentially turned on during the fourth subframe period.

However, the present invention is not limited thereto, and the scramble mode according to an embodiment may be configured in various ways, and the scan controller 220 may control only some scan lines to be turned on during one subframe period according to various scrambling modes. .

The signal controller 210 may transmit video data (frame data) to the PWM generator 231 . The PWM generator 231 may determine the brightness of each of the pixels based on the video data, and may adjust the PWM duty according to the brightness of each of the pixels.

The PWM generator 231 may transmit the generated PWM signal to the current generator 232 , and the current generator 232 may convert the PWM signal into a current. In this case, the current generator 232 may adjust the brightness of each of the pixels by controlling the magnitude of the current.

The current generator 232 may supply the generated current to each of the channels. Accordingly, pixels (LEDs) corresponding to the scan lines switched on by the scan controller 220 may be turned on.

Meanwhile, a block diagram of the display driver 120 illustrated in FIG. 3 is a block diagram for an exemplary embodiment. Each component in the block diagram may be integrated, added, or omitted according to the specifications of the display driving unit 120 that are actually implemented. That is, two or more components may be combined into one component, or one component may be subdivided into two or more components as needed. In addition, the function performed in each block is for describing the embodiments, and the specific operation or device does not limit the scope of the present invention.

4 is a diagram illustrating a form in which pixels included in a display module emit light when the display driver operates in a general scramble mode.

Referring to FIG. 4 , a frame period F displaying one frame may be divided into a plurality of sub frame periods SF.

Hereinafter, for convenience of description, it will be described with reference to an example in which one frame section is composed of 64 sub-frame sections SF0 to SF63. Accordingly, when the frame rate is 60 Hz, the time corresponding to one frame period F may be 0.016 sec, and the time corresponding to one sub frame period SF may be 260.4 usec.

In addition, hereinafter, for convenience of description, the number of the plurality of scan lines is 32 as an example.

When the display driver 120 according to an embodiment operates in the general scramble mode, the display driver 120 may sequentially switch 32 scan lines during one subframe period. For example, the scan control unit 220 divides one sub-frame section into 32 sections again, turns on the switch of the first scan line scan0 during the first section T0, to turn on the first scan line LEDs corresponding to (scan0) can be controlled to emit light. During the first period T0, the switches of the remaining 31 scan lines scan1 to scan31 are turned off. Also, when the first period T0 ends and the second period T1 begins, the switch of the first scan line scan0 is turned off and the switch of the second scan line scan1 is turned on. ) to control the LEDs corresponding to the second scan line scan1 to emit light. Even during the second period T1 , the switches of the remaining 31 scan lines scan0 , scan2 to scan31 except for the second scan line scan1 are turned off. By sequentially switching from the first scan line scan0 to the 32nd scan line scan31 in the same manner, all pixels may be emitted during the sub-frame period SF. Accordingly, in the general scramble mode, switching occurs 32 times during one subframe period SF.

5 is a diagram illustrating a form in which a display module emits light when a display driver operates in a dual scramble mode according to an exemplary embodiment.

The plurality of scan lines according to an embodiment may be divided into a plurality of groups according to the order of the scan lines. For example, in the dual scramble mode, a first group in which the order of scan lines is odd and a second group in which the order of scan lines are even may be divided. However, the present invention is not limited thereto.

In FIG. 5, for convenience of explanation, the number of the plurality of scan lines will be described as being 32 as an example.

When the display driver 120 according to an embodiment operates in the dual scramble mode, the display driver 120 sequentially scans the scan lines included in one of the first group or the second group during one sub-frame period. can be switched For example, the scan controller 220 may sequentially switch the scan lines of the first group during the first sub-frame period SF0, and sequentially switch the scan lines of the second group during the second sub-frame period SF1. can be switched to Also, the scan lines of the first group may be sequentially switched again during the third sub-frame period SF3.

In addition, the scan control unit 220 divides the first sub-frame period SF0 into 16 periods again, and turns on the switch of the first scan line scan0 of the first group during the first period T0. , it is possible to control the LEDs corresponding to the first scan line scan0 to emit light. In addition, during the first period T0, the remaining 15 scan lines scan2, scan4, ..., scan 30 of the first group and the 16 scan lines scna1, scan3, ..., scan31 of the second group are switched are all off. Also, when the first period T0 ends and the second period T1 begins, the switch of the first scan line scan0 is turned off, and the second scan line scan2 of the first group is turned off. By turning on the switch, LEDs corresponding to the second scan line scan2 may be controlled to emit light. During the second period T1, the remaining 15 scan lines scan0, scan4, scna6, ..., scan30 of the first group except for the second scan line scan2 and the 16 scan lines scna1 of the second group , scan3, ..., scan31) are all off. In the same manner, the scan control unit 220 sequentially switches from the first scan line of the first group to the sixteenth scan line scan 2n (n=0, 1, ..., 15), so that the first sub-frame period ( During SF0), 1/2 of the total number of LEDs (LEDs corresponding to the first group) may be emitted.

In addition, the scan control unit 220 divides the second sub-frame period SF1 into 16 periods and turns on the switch of the first scan line scan1 of the second group during the first period T2, LEDs corresponding to the first scan line scan1 may be controlled to emit light. In addition, during the first period T2, the switches of the remaining 15 scan lines scan3, scan5, ..., scan31 of the second group and the 16 scan lines scan0, scan2, ..., scan30 of the first group are All are off (off). Also, when the first period T2 ends and the second period T3 begins, the switch of the first scan line scan1 is turned off, and the second scan line scan3 of the second group is turned off. By turning on the switch, LEDs corresponding to the second scan line scan3 may be controlled to emit light. During the second period T3, the remaining 15 scan lines scan1, scan5, scan7, ..., scan31 of the second group except for the second scan line scan3 and the 16 scan lines scan0 of the first group , scan2, ..., scan30) are all off. In the same manner, the scan control unit 220 sequentially switches from the first scan line of the second group to the sixteenth scan line scan 2n+1 (n=0, 1, ..., 15), whereby the second sub-frame During the period SF1, 1/2 of the total number of LEDs (LEDs corresponding to the second group) may be emitted.

Accordingly, in the dual scramble mode, only 1/2 of all LEDs are emitted during one sub-frame period, and the emission time of each of the LEDs during one sub-frame period is the general scramble mode of FIG. 4 . Compared with , it is doubled.

In addition, during the two sub-frame periods, all LEDs corresponding to the first group and the second group emit light, and the total light-emitting time of each of the LEDs during the two sub-frame periods is compared with the general scramble mode of FIG. 4 , same.

In addition, switching occurs 16 times during one subframe period, and compared to the general scramble mode of FIG. 4 , the number of switching is reduced to 1/2.

Meanwhile, Equation 1 below represents the LED luminous efficiency.

[Equation 1]

LED luminous efficiency=[(1/Frame rate)-scan*scramble*switch time]/(1/Frame rate)

In Equation 1, scan means the number of scan lines switched on (switching number) during one subframe period, scramble means the number of subframe periods included in one frame period, and switch time (switching time) means a time required for conversion between an on state of the switch and an off state of the switch according to switching.

Therefore, comparing the general scramble mode of FIG. 4 and the dual scramble mode of FIG. 5 , when operating in the dual scramble mode of FIG. 5 , the number of scan lines switched on during one subframe period is reduced by half. , the total switching time is also reduced to 1/2, and the luminous efficiency of the LED is increased according to Equation (1). In addition, when the luminous efficiency of the LED is increased, the maximum brightness of the LED is increased.

Therefore, when the number of scan lines is increased to operate in the dual scramble mode, the maximum brightness of the LED may not be reduced compared to the case of operating in the basic scramble mode without increasing the number of scan lines. For example, when the number of scan lines is doubled and operated in the dual scramble mode, the total switching time may be the same as that of operating in the basic scramble mode without increasing the number of scan lines, The maximum brightness of the LED can be maintained.

6 is a diagram illustrating a form in which a display module emits light when a display driver operates in a quad scramble mode according to an exemplary embodiment.

In the quad scramble mode of the plurality of scan lines according to an embodiment, the plurality of scan lines may be divided into a first group to a fourth group according to the order of the scan lines. For convenience of explanation in FIG. 6 , the number of the plurality of scan lines is 32 as an example. For example, scan lines having an index indicating the order of the plurality of scan lines of 4n (n=0, 1,.., 7) are the first group, and the index is 4n+1 (n=0, 1,.. , 7) as the second group, the scan lines with index 4n+2 (n=0, 1,..., 7) as the third group, and index 4n+3 (n=0, 1, .., 7) may be divided into the fourth group, but is not limited thereto.

When operating in the quad scramble mode, the display driver 120 may sequentially switch scan lines included in one of the first to fourth groups during one subframe period. For example, the scan control unit 220 may sequentially switch the scan lines scan0, scan4, ..., scan 28 of the first group during the first subframe period SF0, and the second subframe period During (SF1), the scan lines scan1, scan5, ..., scna29 of the second group may be sequentially switched. Also, the scan controller 220 may sequentially switch the third group of scan lines during the third sub-frame period SF2 and sequentially switch the fourth group of scan lines during the fourth sub-frame period SF3 . can do. Also, the scan lines of the first group may be sequentially switched again during the fifth sub-frame period.

In addition, the scan control unit 220 divides the first sub-frame period SF0 into eight periods again, and turns on the switch of the first scan line scan0 of the first group during the first period T0. , it is possible to control the LEDs corresponding to the first scan line scan0 to emit light. In addition, during the first period T0, the remaining seven scan lines scan4, scan8, ..., scan 28 of the first group and switches of the scan lines included in the second to fourth groups are all off do. Also, when the first period T0 ends and the second period T1 begins, the switch of the first scan line scan0 is turned off, and the second scan line scan 4 of the first group is turned off. By turning on the switch of , the remaining seven scan lines scan0, scan8, ..., scan28 of the first group except for the second scan line scan 4 and scans included in the second to fourth groups All lines are switched off. In the same manner, the scan control unit 220 sequentially switches from the first scan line of the first group to the eighth scan line scan 4n (n=0, 1, ..., 7), so that during the first sub-frame period (SF0) Among all LEDs, 1/4 of the number of LEDs (LEDs corresponding to the scan lines of the first group) may be emitted.

In addition, the scan control unit 220 divides the second sub-frame period SF1 into eight periods, and turns on the switch of the first scan line scan1 of the second group during the first period T2, LEDs corresponding to the first scan line scan1 may be controlled to emit light. During the first period T2, the switches of the remaining seven scan lines of the second group and the scan lines included in the first group, the third group, and the fourth group are all turned off. Also, when the first period T2 ends and the second period T3 begins, the switch of the first scan line scan 1 is turned off, and the second scan line scan 5 of the second group is turned off. ) is turned on to control the LEDs corresponding to the second scan line scan 5 to emit light. Even during the second period T3, the switches of the remaining seven scan lines of the second group except for the second scan line scan 5 and the scan lines included in the first group, the third group, and the fourth group are all turned off. becomes (off). In the same manner, the scan control unit 220 sequentially switches from the first scan line of the second group to the eighth scan line scan 4n+1 (n=0, 1, ..., 7), whereby the second sub During the frame period, 1/4 of the total number of LEDs (LEDs corresponding to the second group) may be emitted.

Also, the scan controller 220 sequentially extends from the first scan line to the eighth scan line of the third group during the third sub-frame period SF2 (scan 4n+2 (n=0, 1, ..., 7)). By switching, during the third sub-frame period, 1/4 of the total number of LEDs (LEDs corresponding to the third group) may be emitted.

Also, during the fourth sub-frame period SF3, the scan controller 220 sequentially extends from the first scan line of the fourth group to the eighth scan line scan 4n+3 (n=0, 1, ..., 7). By switching, 1/4 of all LEDs (LEDs corresponding to the fourth group) may be emitted during the fourth sub-frame period SF3 .

That is, in the quad scramble mode, only 1/4 of all LEDs are emitted during one sub-frame period, and the emission time of each of the LEDs during one sub-frame period is compared with the general scramble mode of FIG. 4 . If you do, it will be quadrupled.

In addition, during the four sub-frame periods, all LEDs corresponding to the first to fourth groups emit light, and the total light-emitting time of each of the LEDs during the four sub-frame periods is the same as compared to the general scramble mode of FIG. 4 , do.

In addition, switching occurs 8 times during one subframe period, and compared to the general scramble mode of FIG. 4 , the number of switching is reduced to 1/4.

Comparing the general scramble mode of FIG. 4 and the quad scramble mode of FIG. 6 , when operating in the quad scramble mode of FIG. 6 , the number of scan lines switched on during one subframe period is reduced to 1/4, so that the total The switching time is reduced to 1/4, and the luminous efficiency of the LED is increased by Equation (1). In addition, when the luminous efficiency of the LED is increased, the maximum brightness of the LED is increased.

Accordingly, when the number of scan lines is increased to operate in the quad scramble mode, the maximum brightness of the LED may not be reduced compared to the case of operating in the basic scramble mode without increasing the number of scan lines. For example, when the number of scan lines is quadrupled and operated in the quad scramble mode, the total switching time may be the same as that of the basic scramble mode without increasing the number of scan lines, The maximum brightness of the LED can be maintained.

7 is a flowchart illustrating a method of operating a display apparatus according to an exemplary embodiment.

Referring to FIG. 7 , the display apparatus 100 according to an embodiment may switch on only scan lines included in the first group among all scan lines during the first sub-frame period ( S710 ).

The display apparatus 100 according to an embodiment includes a display, and the display may include a plurality of pixels arranged in a matrix form, and each of the plurality of pixels may include an LED. The display includes a plurality of scan lines arranged in a horizontal direction and a plurality of channels arranged in a vertical direction, and an LED is arranged at a point where the scan line and the channel intersect.

The plurality of scan lines according to an embodiment may be divided into a plurality of groups according to a scramble mode. For example, in the dual scramble mode, the plurality of scan lines may be divided into two groups, and in the quad scramble mode, the plurality of scan lines may be divided into four groups. However, the present invention is not limited thereto, and the plurality of scan lines may be divided into a larger number of groups.

Also, a frame section in which one frame is displayed may be divided into a plurality of sub-frame sections. In this case, during one frame period, pixels are driven based on the same frame data.

When the plurality of scan lines are divided into a plurality of groups according to the scramble mode, only the scan lines included in the first group among the plurality of groups are sequentially switched on and switched on during the first subframe period. LEDs corresponding to the scan lines may be turned on. At this time, when the number of scan lines included in the first group is n, the first sub-frame period is divided into n periods, one scan line is switched on during one period, and the remaining (n- 1) It is possible to turn off the switches of the scan lines. For example, during a first period among n periods, a switch of the first scan line may be turned on, and switches of the remaining scan lines may be turned off. During a second period following the first period, the switch of the first scan line may be turned off and the switch of the second scan line may be turned on. In addition, the switches of the remaining (n-2) scan lines may be maintained in an off state. During a third period following the second period, the switch of the second scan line may be turned off and the switch of the third scan line may be turned on, and the switches of the remaining (n-2) scan lines are It can be kept in an off state. The display apparatus 100 according to an embodiment may sequentially switch the n scan lines included in the first group during the first sub-frame period in the same manner.

The display apparatus 100 according to an embodiment may switch on only the scan lines included in the second group among all the scan lines during the second sub-frame period that is the period following the first sub-frame period ( S720).

For example, during the second sub-frame period, when scan lines included in the second group among the plurality of groups are sequentially switched on, LEDs corresponding to the switched-on scan lines are turned on ) can be In this case, when the number of scan lines included in the second group is n, the second subframe period is divided into n periods, one scan line is switched on during one period, and the remaining (n- 1) It is possible to turn off the switches of the scan lines. For example, during a first period among n periods, a switch of the first scan line of the second group may be turned on, and switches of the remaining scan lines may be turned off. During the second period following the first period, the switch of the first scan line of the second group may be turned off and the switch of the second scan line may be turned on. The switches of the remaining (n-2) scan lines may be maintained in an off state. During the third period following the second period, the switch of the second scan line of the second group may be turned off, the switch of the third scan line may be turned on, and the remaining (n-2) scans may be performed. The lines can keep the switches off. The display apparatus 100 according to an embodiment may sequentially switch the n scan lines included in the second group during the second sub-frame period in the same manner.

As described above, the display apparatus 100 according to an embodiment sequentially switches on only the scan lines included in one group among the plurality of groups during one sub-frame period, and for each sub-frame period, each of the plurality of groups By alternately switching on the scan lines included in the LED, driving of the LEDs can be controlled.

8 is a flowchart illustrating an operation method when the display apparatus according to an embodiment operates in the dual scramble mode. When the display apparatus 100 according to an embodiment operates in the dual scramble mode, all scan lines are scanned According to the order of the lines, a first group having an odd order and a second group having an even order of scan lines are divided. The scan lines included in the first group may be sequentially switched on (S810).

Since the operation of sequentially switching on the scan lines included in one group has been described in detail with reference to FIG. 7 , the same description will be omitted. When the scan lines are sequentially switched on, LEDs corresponding to the switched-on scan lines may be turned on.

Also, the display apparatus 100 may sequentially switch on the scan lines included in the second group having an even number during the second subframe period that is the period following the first subframe period ( S820 ). Accordingly, LEDs corresponding to the switched-on scan lines may be turned on.

In addition, the display apparatus 100 may sequentially switch on the scan lines included in the first group having an odd order during the third sub-frame period, which is the period following the second sub-frame period (S830), and the third sub-frame period During the fourth sub-frame period, which is the next period of the frame period, scan lines included in the second group having an even order may be sequentially switched on ( S840 ).

As described above, in the dual scramble mode, the display apparatus 100 according to an exemplary embodiment alternately switches on the scan lines of the first group having an odd order and the scan lines of the second group having an even number in each subframe period. By doing so, it is possible to control the driving of the LEDs.

9 is a flowchart illustrating an operation method when a display apparatus operates in a quad scramble mode according to an exemplary embodiment.

When the display apparatus 100 according to an embodiment operates in the quad scramble mode, all scan lines are scanned in which an index is 4n (n=0, 1, .., k) according to an index indicating the order of the scan lines. The lines are the first group, the scan lines with an index of 4n+1 (n=0, 1,.., k) are the second group, and the index is 4n+2 (n=0, 1,.., k) In scan lines are divided into a third group, and scan lines having an index of 4n+3 (n=0, 1,..., k) are divided into a fourth group.

The display apparatus 100 sequentially performs scan lines having an index of 4n (n=0, 1, .., k) included in the first group among all scan lines during a first sub-frame period among a plurality of sub-frame periods. can be switched on (S910).

Since the operation of sequentially switching on the scan lines included in one group has been described in detail with reference to FIG. 7 , the same description will be omitted. When the scan lines are sequentially switched on, LEDs corresponding to the switched-on scan lines may be turned on.

In the display apparatus 100 according to an embodiment, an index included in the second group among all scan lines is 4n+1 (n=0, 1, .., k) of the scan lines may be sequentially switched on (S920). Accordingly, LEDs corresponding to the switched-on scan lines may be turned on.

Also, in the display apparatus 100, during the third sub-frame period, which is the period following the second sub-frame period, the index included in the third group among all scan lines is 4n+2 (n=0, 1,.., k ) of scan lines may be sequentially switched on (S930), and during the fourth subframe period that is the period following the third subframe period, the index included in the fourth group among all scan lines is 4n The scan lines of +3 (n=0, 1,..., k) may be switched on (S940).

As described above, the display apparatus 100 according to an exemplary embodiment alternately switches on scan lines included in each of the first to fourth groups for each sub-frame period in the quad scramble mode, thereby driving the LEDs. can be controlled.

In FIGS. 8 and 9 , a case in which all scan lines are divided into 2 groups and 4 groups, respectively, has been described as an example, but the present invention is not limited thereto, and when all scan lines are divided into n groups, a subframe By alternately switching on the scan lines of each of the n groups in each section, it is possible to control the driving of the LEDs.

The method of operating a display apparatus according to an embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

In addition, the display apparatus or the method of operating the display apparatus according to the disclosed embodiments may be provided as included in a computer program product. Computer program products may be traded between sellers and buyers as commodities.

The computer program product may include a S/W program and a computer-readable storage medium in which the S/W program is stored. For example, computer program products may include products (eg, downloadable apps) in the form of S/W programs distributed electronically through manufacturers of electronic devices or electronic markets (eg, Google Play Store, App Store). have. For electronic distribution, at least a portion of the S/W program may be stored in a storage medium or may be temporarily generated. In this case, the storage medium may be a server of a manufacturer, a server of an electronic market, or a storage medium of a relay server temporarily storing a SW program.

The computer program product, in a system consisting of a server and a client device, may include a storage medium of the server or a storage medium of the client device. Alternatively, if there is a third device (eg, a smart phone) that is communicatively connected to the server or the client device, the computer program product may include a storage medium of the third device. Alternatively, the computer program product may include the S/W program itself transmitted from the server to the client device or the third device, or transmitted from the third device to the client device.

In this case, one of the server, the client device and the third device may execute the computer program product to perform the method according to the disclosed embodiments. Alternatively, two or more of a server, a client device, and a third device may execute a computer program product to distribute the method according to the disclosed embodiments.

For example, a server (eg, a cloud server or an artificial intelligence server) may execute a computer program product stored in the server to control a client device communicatively connected with the server to perform the method according to the disclosed embodiments.

Although the embodiments have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also included in the scope of the present invention. belongs to

Claims (23)

a display including a plurality of LEDs corresponding to a plurality of scan lines; and
For each scan line, comprising a display driving unit for controlling the operation of the plurality of LEDs,
The display driving unit,
During a first sub-frame section among a plurality of sub-frame sections included in a frame section displaying one frame, the scan lines corresponding to the first group of scan lines among the plurality of groups in which the plurality of scan lines are sequentially divided A display apparatus that turns on only LEDs and turns on only LEDs corresponding to scan lines of a second group among the plurality of groups during a second sub-frame period among the plurality of sub-frame periods. According to claim 1,
The plurality of LEDs are arranged in a matrix form to be positioned at points where the plurality of scan lines and the plurality of channels intersect,
The operation of each of the plurality of LEDs is controlled by one scan line and one channel. 3. The method of claim 2,
The display driving unit,
a scan control unit that switches each of the plurality of scan lines to control operations of the plurality of LEDs for each scan line; and
and a channel controller for supplying power to the plurality of channels based on the brightness of each of the LEDs. 4. The method of claim 3,
The channel control unit,
a PWM generator that determines a PWM duty based on the brightness of each of the LEDs, and generates a PWM signal according to the determined PWM duty; and
and a current generator that converts the PWM signal into a current, controls the magnitude of the current based on the brightness of each of the LEDs, and supplies the current to the plurality of channels. 4. The method of claim 3,
The luminous efficiency of the plurality of LEDs decreases as the switching time by the scan control unit increases,
The switching time decreases as the number of the plurality of groups increases. According to claim 1,
The scan lines are divided into the first group and the second group,
The first group has an odd number of scan lines, and the second group has an even number of scan lines. 7. The method of claim 6,
The display driving unit,
Only LEDs corresponding to the scan lines of the first group are turned on during a third subframe period among the plurality of subframe periods, and among the plurality of groups during a fourth subframe period among the plurality of subframe periods A display device that turns on only the LEDs corresponding to the scan lines of the second group. 7. The method of claim 6,
The display driving unit,
A display device that turns on only 1/2 of the LEDs among the plurality of LEDs during one of the plurality of sub-frame periods. According to claim 1,
The scan lines are divided into the first group, the second group, the third group and the fourth group,
The display driving unit,
Only LEDs corresponding to the scan lines of the third group are turned on during a third subframe period among the plurality of subframe periods, and during a fourth subframe period among the plurality of subframe periods, the fourth A display device that turns on only the LEDs corresponding to the group scan lines. 10. The method of claim 9,
The scan lines included in the first group have an index indicating the order of the scan lines of 4n (n=0, 1, 2, ..., k), and the scan lines included in the second group indicate the order of the scan lines. The index is 4n+1 (n=0, 1, 2,..., k), and the scan lines included in the third group have an index indicating the order of the scan lines of 4n+2 (n=0, 1, 2, . 10. The method of claim 9,
The display driving unit,
A display device that turns on only 1/4 of the plurality of LEDs during one of the plurality of sub-frame periods. A method of operating a display device including a plurality of LEDs corresponding to a plurality of scan lines, the method comprising:
During a first sub-frame section among a plurality of sub-frame sections included in a frame section displaying one frame, scan lines included in the first group among a plurality of groups in which the plurality of scan lines are sequentially divided turning on only the corresponding LEDs; and
and turning on only LEDs corresponding to scan lines of a second group among the plurality of groups during a second sub-frame period among the plurality of sub-frame periods. 13. The method of claim 12,
The plurality of LEDs are arranged in a matrix form to be positioned at points where the plurality of scan lines and the plurality of channels intersect,
The operation method of each of the plurality of LEDs, the operation of which is controlled by one scan line and one channel. 13. The method of claim 12,
The step of turning on only the LEDs corresponding to the scan lines included in the first group includes:
Switching each of the scan lines included in the first group to turn on LEDs corresponding to the scan lines included in the first group for each scan line;
The step of turning on only the LEDs corresponding to the scan lines included in the second group includes:
and switching on each of the scan lines included in the second group to turn on LEDs corresponding to the scan lines included in the second group for each scan line. 13. The method of claim 12,
The method of operation is
determining a PWM duty based on the brightness of each of the LEDs, and generating a PWM signal according to the determined PWM duty; and
converting the PWM signal into a current, controlling the magnitude of the current based on the brightness of each of the LEDs, and supplying the current to the plurality of channels. 13. The method of claim 12,
The luminous efficiency of the plurality of LEDs decreases as the switching time of the plurality of scan lines increases,
and the switching time decreases as the number of the plurality of groups increases. 13. The method of claim 12,
The scan lines are divided into the first group and the second group,
The first group has an odd number of scan lines, and the second group has an even number of scan lines. 18. The method of claim 17,
The method of operation is
turning on only LEDs corresponding to the scan lines of the first group during a third sub-frame period among the plurality of sub-frame periods; and
The method of claim 1, further comprising: turning on only LEDs corresponding to scan lines of a second group among the plurality of groups during a fourth sub-frame period among the plurality of sub-frame periods. 18. The method of claim 17,
A method of operating a display apparatus for turning on only 1/2 of the plurality of LEDs during one sub-frame period among the plurality of sub-frame periods. 13. The method of claim 12,
The scan lines are divided into the first group, the second group, the third group and the fourth group,
The method of operation is
turning on only LEDs corresponding to the scan lines of the third group during a third sub-frame period among the plurality of sub-frame periods; and
and turning on only LEDs corresponding to the scan lines of the fourth group during a fourth sub-frame period among the plurality of sub-frame periods. 21. The method of claim 20,
The scan lines included in the first group have an index indicating the order of the scan lines of 4n (n=0, 1, 2, ..., k), and the scan lines included in the second group indicate the order of the scan lines. The index is 4n+1 (n=0, 1, 2,..., k), and the scan lines included in the third group have an index indicating the order of the scan lines of 4n+2 (n=0, 1, 2, . 21. The method of claim 20,
A method of operating a display apparatus for turning on only 1/4 of the plurality of LEDs during one of the plurality of sub-frame periods. One or more computer-readable recording media in which a program for performing the method of claim 12 is stored.

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