KR20160018012A - Low power consumption display apparatus and driving method thereof - Google Patents

Low power consumption display apparatus and driving method thereof Download PDF

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Publication number
KR20160018012A
KR20160018012A KR1020140101859A KR20140101859A KR20160018012A KR 20160018012 A KR20160018012 A KR 20160018012A KR 1020140101859 A KR1020140101859 A KR 1020140101859A KR 20140101859 A KR20140101859 A KR 20140101859A KR 20160018012 A KR20160018012 A KR 20160018012A
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frame
pixel
gate line
interframe
gate
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KR1020140101859A
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Korean (ko)
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최병덕
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한양대학교 산학협력단
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Priority to KR1020140101859A priority Critical patent/KR20160018012A/en
Publication of KR20160018012A publication Critical patent/KR20160018012A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

A display device for removing motion blur through selective gate line driving and a method for driving the display device are provided. The display device includes a gate driver for comparing the first frame and the second frame before the first frame to detect a first pixel where a motion blur occurs and controlling a gate line for controlling the first gate line including the first pixel And generating a control signal to selectively drive the first gate line based on the gate line control signal to reduce power consumption.

Figure P1020140101859

Description

[0001] LOW POWER CONSUMPTION DISPLAY APPARATUS AND DRIVING METHOD THEREOF [0002]

A display device and a method of driving a display device that reduce motion blurring phenomenon at low power through selective gate line driving are provided. More specifically, in improving motion blur, a method of selectively driving some gate lines among all gate lines to reduce power consumption is provided.

LCD (Liquid Crystal Display) has a problem that a motion blur occurs when a moving picture is reproduced due to a hold type display device. The motion blur phenomenon is a moving picture phenomenon caused by the inherent problem of the hold type display.

In order to solve the problem of motion blur, a technique of inserting an interpolated frame between existing frames using a frame frequency higher than the frequency of an existing frame is widely used.

For example, if the frequency of the existing frame is 60 Hz, interpolated frames are inserted between existing frames using 120 Hz or 240 Hz which is higher than the frequency of the existing frame to solve the motion blur phenomenon.

This can reduce the motion blur, but the problem is that the power consumption is doubled (120 Hz driving) and 4 times (240 Hz driving) due to the increase of the frame frequency. Accordingly, there is a demand for a method capable of minimizing the increase of the power consumption while reducing the motion blur phenomenon.

According to one aspect, in a display device in which a plurality of gate lines and data lines are composed of m rows and n columns, a first frame is compared with a second frame before the first frame, Generating a gate line control signal for controlling a first gate line including the first pixel and generating a gate line control signal for controlling the first gate line among the plurality of gate lines based on the gate line control signal. And selectively driving the display device.

According to one embodiment, the first pixel can be detected based on a comparison between a moving speed of an object included in the first frame and the second frame and a preset first threshold speed.

If the moving speed of the object is equal to or greater than the predetermined first threshold speed, the step of detecting the first pixel may include: a step of detecting a pixel for displaying the object in the first frame and a pixel for displaying the object in the second frame It is possible to detect the first pixel from which the motion blur occurs.

In addition, the moving speed of the object may be determined based on a change in a pixel indicating an edge of the object when the first frame is switched in the second frame.

According to an embodiment, the method may further include generating at least one interframe inserted between the first frame and the second frame for the first pixel after detecting the first pixel.

According to an embodiment, the step of selectively driving the first gate line among the plurality of gate lines includes turning off the second gate line excluding the first gate line among the plurality of gate lines, A pixel coupled to the gate line may hold a voltage applied in the second frame.

According to another aspect of the present invention, there is provided a method of driving a liquid crystal display device, comprising: comparing a first frame and a second frame before the first frame to detect a first pixel where a motion blur occurs; A frame rate converter for generating a line control signal, and a gate driver for selectively driving the first gate line among the plurality of gate lines based on the gate line control signal.

According to one embodiment, the first pixel can be detected based on a comparison between a moving speed of an object included in the first frame and the second frame and a preset first threshold speed.

According to one embodiment, when the moving speed of the object is equal to or greater than the preset first threshold speed, the frame rate converter may include a pixel for displaying an object in the first frame and a pixel for displaying an object in the second frame It is possible to detect the first pixel from which the motion blur occurs.

In addition, the frame rate converter may generate at least one interframe inserted between the first frame and the second frame for the first pixel.

According to one embodiment, the memory may further include a memory for storing an input frame, and the frame rate converter and the memory may be integrated into a timing controller that controls the plurality of gate drivers and the plurality of data drivers to operate .

According to another aspect of the present invention, there is provided a method of driving a liquid crystal display device, comprising: detecting a first pixel by comparing a first frame and a second frame before the first frame to detect a first pixel where a motion blur occurs; And a control signal generating section for generating a gate line control signal for controlling the frame rate of the video signal.

According to an embodiment of the present invention, there is further provided a moving speed determining unit for determining a moving speed of an object included in the first frame and the second frame, wherein the detecting unit detects a moving speed of the object and a preset first threshold speed The first pixel can be detected based on the comparison.

When the moving speed of the object is equal to or greater than the predetermined first threshold speed, the detecting unit may generate a pixel for displaying the object in the second frame and a pixel for displaying the object in the first frame, It can be detected by the first pixel.

According to an exemplary embodiment, the apparatus may further include an inter frame generator for generating at least one interframe inserted between the first frame and the second frame for the first pixel.

Figure 1 shows a block diagram of a display device according to one embodiment.
2 shows a block diagram of a frame rate converter (FRC) according to one embodiment.
FIG. 3 illustrates a method of removing motion blur by inserting an interframe according to one comparative example.
4 illustrates a method of removing motion blur by inserting an interframe according to an embodiment and a waveform of a voltage applied to a gate line.
FIG. 5 illustrates a method of inserting an interframe according to another embodiment to remove motion blur and a waveform of a voltage applied to a gate line.
Figures 6A-6B show the voltage change with frame change.
Figure 7 illustrates a gate line pattern that is selectively driven based on an image pattern according to one embodiment.
8 is a flowchart of a method of driving a display device according to an embodiment.
9 is a flowchart of a method of driving a display device according to an embodiment.

In the following, some embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the rights is not limited or limited by these embodiments. Like reference symbols in the drawings denote like elements.

The terms used in the following description are chosen to be generic and universal in the art to which they are related, but other terms may exist depending on the development and / or change in technology, customs, preferences of the technician, and the like. Accordingly, the terminology used in the following description should not be construed as limiting the technical thought, but should be understood in the exemplary language used to describe the embodiments.

Figure 1 shows a block diagram of a display device according to one embodiment.

According to one embodiment, the display device may include a timing controller 110, a gate driver 120, a data driver 130 and a panel 140.

The timing controller 110 may control the gate driver 120 and the data driver 130 to operate. The timing controller 110 may include a frame rate converter 150 for generating an interframe to insert an interframe between frames to remove the motion blurring phenomenon, and a memory 160 for storing an input frame.

Motion blur is a moving picture phenomenon that occurs due to the inherent problem of the hold type display, and can be detected through the comparison between frames. In order to improve the motion blur, a driving method of increasing the frame frequency by inserting an interframe between frames has been used.

An interframe is a frame inserted between general frames to improve the motion blur phenomenon. In the conventional motion blur removal method, an interframe is generated for a portion of an inserted interframe that has no motion of an object. Therefore, unnecessary charging and discharging are performed also for a portion where there is no motion of the object, thereby increasing power consumption.

The frame rate converter 150 receives the first frame and can compare the first frame with the second frame before the first frame. The frame rate converter 150 can detect the first pixel where the motion blur occurs by comparing the first frame and the second frame.

The frame rate converter 150 may generate at least one interframe for the first pixel corresponding to the portion where the motion blur occurs without generating the interframe corresponding to the entire pixel when generating the interframe . Frame rate converter 150 may transmit data to data driver 130, which may be a second frame, at least one interframe, and a first frame. The frame rate converter may sequentially transmit the second frame, the at least one interframe, and the first frame to the data driver 130.

In this way, the display device sequentially displays the second frame, the at least one interframe, and the first frame, thereby displaying an image in which motion blur is eliminated.

In addition, the frame rate converter 150 may generate a gate line control signal for controlling the first gate line including the detected first pixel. The frame rate converter 150 can selectively drive the first gate line by transmitting the generated gate line control signal to the gate driver 120. [

Accordingly, the gate driver 120 can reduce the power consumption by selectively driving the first gate line among all the gate lines without driving all the gate lines.

The frame rate converter 150 may determine that no motion blur occurs when there is no image change as a result of comparing the first frame and the second frame. In this case, the frame rate converter can switch from the second frame to the first frame without generating the interframe.

The memory 160 may store an incoming frame. The frame rate converter 150 may compare the frames input with the frames stored in the memory 160. The frame rate converter 150 and the memory 160 may be integrated in the timing controller 110. [

The frame rate converter 150 receives the first frame and reads the second frame before the first frame stored in the memory 160. [ The frame rate converter 150 can detect the first pixel where the motion blur occurs by comparing the received first frame with the second frame read from the memory 160.

The gate driver 120 may selectively drive the gate line based on the gate line control signal received from the frame rate converter 150. In general, the gate driver 120 may sequentially drive gate lines to display a frame.

However, when all the gate lines are driven to display inter frames, power consumption may be unnecessarily generated because the gate lines corresponding to the portions where there is no motion of the object must be driven as described above.

Therefore, based on the received gate line control signal to reduce the power consumption from the timing controller 110, the gate driver 120 selectively drives the first gate line including the first pixel where the motion blur occurs .

The gate driver 120 may hold the voltage applied in the second frame to the pixel connected to the second gate line by turning off the second gate line except for the first gate line among the plurality of gate lines. In this way, the existing second frame can be maintained for a portion where there is no motion of the object.

The data driver 130 may output the display data to the data line when the switching element connected to the gate line is turned on. The data driver 130 sequentially outputs a second frame, at least one interframe, and a first frame, which are received from the timing controller 110, so that the frames sequentially include a plurality of pixels, As shown in FIG.

2 shows a block diagram of a frame rate converter (FRC) according to one embodiment.

The frame rate converter 150 may include a moving speed determining unit 210, a detecting unit 220, an interframe generating unit 230, and a control signal generating unit 240.

The detecting unit 220 may compare the first frame with the second frame before the first frame to detect the first pixel where the motion blur occurs. The detection unit 220 can use the moving speed of the object included in the first frame and the second frame as a reference for detecting the first pixel where motion blur occurs.

The moving speed determining unit 210 can determine the moving speed of the object included in the first frame and the second frame. The moving speed of the object may be determined based on a change in the pixel indicating the edge of the object when the first frame is switched in the second frame.

As described above, motion blur is a moving picture phenomenon caused by a birth problem of a hold-type display, and may occur when motion of an object occurs over a certain standard.

Therefore, the moving speed of the object can be used as a reference on which such motion blur occurs. The moving speed of an object can be determined by how many pixels the edge of the object moves when the frame is switched. For example, it can be determined that motion blur occurs when the moving speed of the object is equal to or greater than a preset first threshold speed. On the other hand, when the moving speed of the object is less than the preset first threshold speed, it can be determined that no motion blur occurs.

Therefore, the moving speed determining unit 210 can determine the moving speed of the object to provide a criterion for determining whether or not motion blur occurs. Specifically, the moving speed determining unit 210 can determine the moving speed of the object using the pixel indicating the edge of the object in the second frame and the pixel indicating the edge of the object in the first frame.

Specifically, the moving speed determination unit 210 can determine the moving speed of the object using the pixel position at which the edge of the object is displayed in the second frame and the pixel position at which the edge of the object is displayed in the first frame.

The movement speed determination unit 210 can transmit the determined movement speed of the object to the detection unit 220. [ The detecting unit 220 may compare the moving speed of the transmitted object with a preset first threshold speed. The first threshold rate is a value corresponding to a criterion for generating motion blur, and may be set in advance in consideration of hardware performance of the display device, frame frequency, and the like.

When the moving speed of the object is equal to or greater than the preset first threshold speed, the detecting unit 220 detects a pixel for displaying the object in the second frame and a pixel for displaying the object in the first frame, It can be detected with one pixel.

The interframe generation unit 230 may generate at least one interframe inserted between the first frame and the second frame for the first pixel. The interframe generation unit 230 may generate an interframe for the detected first pixel instead of generating at least one interframe for all the pixels.

The interframe generation unit 230 may determine the number of interframes generated based on the increased frame frequency according to the inserted interframe. For example, an interframe that is an interpolated frame between existing frames can be inserted using the existing interframe frequency of 60 Hz and a frequency higher than the existing frame frequency of 120 Hz or 240 Hz. When 120 Hz is used, one interframe can be generated. When 240 Hz is used, three interframes can be generated.

The frame rate converter 150 can sequentially transmit the second frame, the at least one interframe generated through the interframe generation unit 230, and the first frame to the data driver 130 in sequence.

The control signal generator 240 may generate a gate line control signal for controlling the first gate line including the first pixel detected through the detector 220. In addition, the frame rate converter 150 can transmit the gate line control signal generated by the control signal generator 240 to the gate driver 120.

Through this, the gate driver 120 can selectively drive the first gate line without driving the entire gate line. By selectively driving the first gate line in this manner, power consumption consumed in the display device can be reduced.

In FIG. 2, the frame rate converter 150 has been described as a separate unit for convenience of explanation. However, the frame rate converter 150 may be a single processor included in the frame rate converter 150, It will be apparent to those of ordinary skill in the art that the present invention can be implemented through a computer.

FIG. 3 illustrates a method of removing motion blur by inserting an interframe according to one comparative example.

FIG. 3 shows a screen in which an interframe 330 is inserted between a first frame 310 and a second frame 320 according to a comparative example. As shown in FIG. 3, an interframe 330 is created for the entire screen regardless of the motion of the object.

In the lower part of FIG. 3, the pixel screen of the second frame 320, the interframe 330 and the first frame 310 and the pixel screen of the second frame 320, the interframe 335, and the first frame 315 And the voltage applied to the gate line is shown. The pixels are briefly shown for the purpose of illustration, in which six pixels are arranged in one row and six columns.

3, the position of the object 340 on the pixel in the second frame 320, the interframe 330, and the first frame 310 is shown. However, in the prior art, the inter frame 330 is generated for all the pixels regardless of the motion of the object 340, and the entire gate line is driven to display the inter frame 330.

The waveform of the voltage applied to each gate line is shown on the left side of the second frame 320, the interframe 330, and the first frame 310. Referring to the waveform of the voltage, it can be seen that the voltage is applied sequentially from the top gate line. In this way, although the position of the object on the pixel is limited to the second and third lines from the top, the entire gate lines are sequentially driven as in the case of displaying the first frame 310. [

In such a method of providing motion blur through interframe insertion, unnecessary charging and discharging are performed by driving the entire gate line irrespective of the motion of the object, thereby increasing the power consumption Respectively.

4 illustrates a method of removing motion blur by inserting an interframe according to an embodiment and a waveform of a voltage applied to a gate line.

FIG. 4 schematically shows waveforms of voltages applied to the screen and gate lines divided by pixels of each frame. According to one embodiment, the interframe 430 can be generated only for the portion 431 in which the motion of the object occurs in the inserted interframe 430. And can be maintained in the existing second frame 420 in the portion 432 in which the object is not moving.

Accordingly, the first gate line corresponding to the portion 431 in which the motion of the object is generated may be selectively driven, and the second gate line corresponding to the portion 432 in which the object does not move may not be driven. The second gate line may maintain a voltage applied to indicate the second frame so that no separate charge and discharge may occur. As a result, the power consumption may be reduced as compared with a method of driving the entire gate lines in the process of inserting inter frames.

The waveform shown on the left side of the interframe 430 is a simplified representation of the waveform of the voltage applied to the gate line. It can be seen that only the gate line including the pixel for displaying the object 440 is driven by voltage have.

The motion of the object 440 included in the first frame 410 and the second frame 420 can be determined by comparing the first frame 410 and the second frame 420 before the first frame. A first pixel indicating an object 440 in which motion occurs in the first frame 410 and the second frame 420 can be detected.

Therefore, in a case where the interframe 430 is displayed instead of driving all the gate lines as in the case of displaying the first frame 410, only the first gate line can be selectively driven.

In addition, even if the gate line excluding the first gate line is not driven, the motion blur is not generated in the portion where the motion of the object does not occur, so that the effect of removing the motion blur can be maintained as usual.

4 shows a waveform of a voltage applied to the gate line in the process of switching to the second frame 420, the interframe 430, and the first frame 410. FIG. In the second frame 420 and the first frame 410, a voltage is applied to the entire gate line to display each frame. However, in the interframe 430, it can be seen that the voltage is applied only to the first gate line including the first pixel for displaying the object.

In FIG. 4, a voltage application time such as the second frame 420 and the first frame 410 may be applied to the first gate line. Therefore, a time delay occurs because the upper one gate line of the first gate line is not driven, and the first gate line can be driven after a delay time. Also, before the first gate line is driven and before the first frame is switched, three gate lines at the bottom of the first gate line may not be driven, resulting in a delay time. Therefore, even when the gate lines are sequentially driven, the first gate lines can be selectively driven.

FIG. 5 illustrates a method of inserting an interframe according to another embodiment to remove motion blur and a waveform of a voltage applied to a gate line.

In FIG. 5, the waveforms of the voltages applied to the screen and the gate lines classified by the pixels of each frame are schematically shown in FIG. 4 is a waveform of a voltage applied to the gate line shown on the left side of the interframe 530. [ 5, the waveform of the voltage applied to the gate line for displaying the first frame 510 may be different from the waveform of the voltage applied to the first gate line including the first pixel for displaying the object.

5 also compares the first frame 510 and the second frame 520 before the first frame to determine the movement of the object 540 included in the first frame 510 and the second frame 520 . Whereby a first pixel indicating an object 540 in which motion occurs in the first frame 510 and the second frame 520 can be detected.

The interframe 530 can be generated only for the portion 531 where the motion of the object occurs in the inserted interframe 530 as described in FIG. And can be maintained in the existing second frame 520 in the portion 532 where there is no motion of the object.

Accordingly, the first gate line corresponding to the portion 531 in which the motion of the object is generated may be selectively driven, and the second gate line corresponding to the portion 532 in which the object does not move may not be driven.

4, the voltage applied to the first gate line is not added to the delay time generated by the gate line of the first gate line, The voltage may be directly applied to the first gate line. Also, in the process of switching from the interframe 530 to the first frame 510, the three gate lines at the bottom of the first gate line are not driven, so that the first frame 510 can be directly switched without a delay time .

5 shows the waveform of a voltage applied to the gate line in the process of changing to the second frame 520, the interframe 530, and the first frame 510. In FIG. As described above, unlike FIG. 4, when driving the first gate line, a voltage can be applied to the first gate line without a separate delay time.

4 and 5, unnecessary charge and discharge are not generated in the gate line excluding the first gate line by selectively driving only the first gate line including the pixel for displaying the motion-generating object . As a result, the power consumption can be reduced as compared with the case of driving the entire gate line.

Figures 6A-6B show the voltage change with frame change.

6A is a graph illustrating a transmittance according to a voltage in a process of changing a frame. And the polarity of the voltage applied to the pixel is inversion with the change of the frame based on the common electrode V COM . Thus, the polarity of the applied voltage may be changed during the frame switching.

For example, when a voltage applied to a pixel of a previous frame is a negative voltage (-V Negative ), the voltage may be changed to a positive voltage (V Positive ) as the frame is switched. On the other hand, when the voltage applied to the pixel of the previous frame is a positive voltage (V Positive ), the voltage may be changed to a negative voltage (-V Negative ) as the frame is switched.

6B is a graph showing a change in voltage with time in a process of switching to a frame. When the voltage applied to the pixel in the previous frame is a negative voltage (-V Negative ), the voltage applied to the pixel may be switched to a positive voltage (V Positive ) when the frame is switched. The negative voltage (-V Negative ) and the positive voltage (V Positive ) may be determined to have the same gray level when they have the same absolute value based on V COM .

Referring to FIGS. 6A and 6B, the power consumed in the display can be expressed by Equation (1).

Figure pat00001

Where P CONV represents the power consumption when driving the entire gate line, C represents the capacitance of the pixel, V DD represents the maximum value of the supply voltage, and V SWING represents the positive voltage (V Positive ) and negative Represents the difference of the voltage (-V Negative ), and f represents the frequency.

On the other hand, the power consumption in the case of selectively driving the gate line in generating the interframe according to an embodiment can be expressed by Equation (2).

Figure pat00002

Here P proposed denotes the power consumption in the case of selectively driving the gate lines in accordance with one embodiment, N Row_moving indicates the number of gate lines corresponding to the pixels for displaying the object to the motion generation, N Row full Represents the number of gate lines corresponding to pixels.

According to one embodiment, in generating an interframe, an interframe is not generated for all pixels. Therefore, instead of driving the entire gate line, the first gate line including the first pixel which is detected as the occurrence of the motion blur is selectively driven, so that in calculating the power consumption

Figure pat00003
The term can be multiplied.
Figure pat00004
Term is a term indicating the ratio of the width of the entire gate line to the width of the gate line to be selectively driven, and it is understood that P proposed is reduced as compared with P CONV since the number is less than 1.

Figure 7 illustrates a gate line pattern that is selectively driven based on an image pattern according to one embodiment.

FIG. 7 shows a pattern of gate lines selectively driven based on three image patterns. The image patterns of the second frames 710, 720, and 730 and the interframes 715, 725, and 735 are shown, and the black portions in each image represent moving objects.

In the process of converting from the second frames 710 and 720 to the inter frames 715 and 725, when the object moves horizontally, it is possible to selectively drive the first gate line including the pixel representing the object.

Since the object is moving horizontally, the horizontal position of the object on the pixel in the second frame 710, 720 and the horizontal position of the object on the interframe 715, 725 may be the same. Therefore, it is possible to selectively drive only the first gate line (1/10 R) corresponding to the pixel position of the object displayed in the first frame and the second frame.

The power consumed when the selectively driven first gate line 1 / 10R is 1/10 of the total gate line R consumes about the power consumption when driving the entire gate line to generate an inter frame 55%.

On the other hand, in the process of converting from the second frame 730 to the interframe paper 735, the object can move not only in the horizontal direction but also in the vertical direction. In this case as well, it is possible to selectively drive the first gate line including the pixel representing the object based on the motion of the object.

In the interframe 735, the object is not displayed at the position of the pixel of the object displayed in the second frame 730, but may be displayed at the position of the new pixel according to the movement of the object.

Therefore, the gate line 1/10 R corresponding to the pixel position of the object displayed in the second frame 730 and the gate line 1/10 R corresponding to the pixel position of the new object according to the motion of the object And may be selectively driven to the first gate line (1/5 R).

The power consumption when the first gate line (1/5 R) is selectively driven is higher than the power consumption of the first gate line (1/10 R) described above, but when the entire gate line is driven Of the power consumption of the battery.

The above-described ratio of the power consumption is only an exemplary value for the purpose of explanation, and is not limited thereto.

As described above, by selectively driving the first gate line including the pixel for displaying the motion of the object, the power consumption can be reduced as compared with driving the entire gate line.

8 is a flowchart of a method of driving a display device according to an embodiment.

In step 810, the frame rate converter 150 may compare the first frame with the second frame before the first frame to detect the first pixel where the motion blur occurs. This is to generate at least one interframe for the first pixel in which motion blur occurs, rather than generating an interframe for the entire pixel.

In step 820, the frame rate converter 150 may generate a gate line control signal for controlling the first gate line including the first pixel. Frame rate converter 150 may transmit the generated gate line control signal to gate driver 120. [

In step 830, the gate driver 120 may selectively drive the first gate line based on the received gate line control signal. In this manner, unnecessary charging and discharging can be prevented by selectively driving the first gate line without driving the entire gate line to display the interframe. Thus, the power consumption in driving the display device can be reduced.

9 is a flowchart of a method of driving a display device according to an embodiment.

After detecting the first pixel at which the motion blur occurs in step 810, the frame rate converter 150 in step 910 determines at least one interframe inserted between the first frame and the second frame as the first pixel Can be generated.

The frame rate converter 150 may generate an interframe for the detected first pixel instead of generating at least one interframe for the entire pixel.

In step 920, the display device may sequentially display the second frame, the at least one interframe, and the first frame through the panel 140. Frame rate converter 150 may generate at least one interframe at step 910 and then sequentially transmit the second frame, at least one interframe, and the first frame to data driver 130.

The data driver 130 may output the display data to the data line when the switching element connected to the gate line is turned on. The data driver 130 sequentially outputs a second frame, at least one interframe, and a first frame, which are received from the timing controller 110, so that the frames sequentially include a plurality of pixels, As shown in FIG.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA) A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command 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, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (16)

In a display device in which a plurality of gate lines and data lines are composed of m rows and n columns,
Comparing a first frame with a second frame preceding the first frame to detect a first pixel where motion blur occurs;
Generating a gate line control signal for controlling a first gate line including the first pixel; And
Selectively driving the first gate line among the plurality of gate lines based on the gate line control signal
And a display device. The method according to claim 1,
Wherein the first pixel comprises:
And detecting a movement speed of an object included in the first frame and the second frame based on a comparison of a preset first threshold speed. 3. The method of claim 2,
Wherein the step of detecting the first pixel comprises:
A pixel for displaying an object in the first frame and a pixel for displaying an object in the second frame are detected as a first pixel generated by the motion blur when the moving speed of the object is equal to or greater than the predetermined first threshold speed , And a method of driving the display device. 3. The method of claim 2,
The movement speed of the object
And when the first frame is switched in the second frame, a determination is made based on a change in a pixel indicating an edge of the object. The method according to claim 1,
Generating at least one interframe inserted between the first frame and the second frame for the first pixel after detecting the first pixel,
Wherein the display device further comprises: The method according to claim 1,
Wherein the step of selectively driving the first gate line among the plurality of gate lines comprises:
And holding a voltage applied in the second frame to a pixel connected to the second gate line by turning off a second gate line excluding the first gate line among the plurality of gate lines. A first frame is compared with a second frame before the first frame to detect a first pixel where motion blur occurs and a gate line control signal for controlling a first gate line including the first pixel is generated A frame rate converter; And
A gate driver for selectively driving the first gate line among the plurality of gate lines based on the gate line control signal,
. 8. The method of claim 7,
Wherein the first pixel comprises:
And detecting a movement speed of an object included in the first frame and the second frame and a preset first threshold speed. 9. The method of claim 8,
Wherein the frame rate converter comprises:
A pixel for displaying an object in the first frame and a pixel for displaying an object in the second frame are detected as a first pixel generated by the motion blur when the moving speed of the object is equal to or greater than the predetermined first threshold speed , A display device. 9. The method of claim 8,
Wherein the frame rate converter comprises:
And generates at least one interframe inserted between the first frame and the second frame for the first pixel. 9. The method of claim 8,
Memory for storing input frames
And a display device. 12. The method of claim 11,
Wherein the frame rate converter and the memory are integrated in a timing controller that controls the plurality of gate drivers and the plurality of data drivers to operate. A detector comparing the first frame with a second frame preceding the first frame to detect a first pixel where motion blur occurs; And
A control signal generating unit for generating a gate line control signal for controlling the first gate line including the first pixel,
/ RTI > 14. The method of claim 13,
A moving speed determining unit for determining a moving speed of an object included in the first frame and the second frame,
Further comprising:
Wherein the detection unit detects the first pixel based on a comparison between a moving speed of the object and a preset first threshold speed. 15. The method of claim 14,
Wherein:
A pixel displaying the object in the second frame and a pixel displaying the object in the first frame are detected as the first pixel generated by the motion blur when the moving speed of the object is equal to or greater than the preset first threshold speed , Frame rate converter. 14. The method of claim 13,
An inter-frame generation unit for generating at least one inter-frame inserted between the first frame and the second frame for the first pixel,
Further comprising a frame rate converter.
KR1020140101859A 2014-08-07 2014-08-07 Low power consumption display apparatus and driving method thereof KR20160018012A (en)

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