KR20160018012A - Low power consumption display apparatus and driving method thereof - Google Patents
Low power consumption display apparatus and driving method thereof Download PDFInfo
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- 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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- 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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- 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.
Description
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
The
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
The
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
Accordingly, the
The
The
The
The
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
The
The
2 shows a block diagram of a frame rate converter (FRC) according to one embodiment.
The
The detecting
The moving
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
Specifically, the moving
The movement
When the moving speed of the object is equal to or greater than the preset first threshold speed, the detecting
The
The
The
The
Through this, the
In FIG. 2, the
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
In the lower part of FIG. 3, the pixel screen of the
3, the position of the
The waveform of the voltage applied to each gate line is shown on the left side of the
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
Accordingly, the first gate line corresponding to the
The waveform shown on the left side of the
The motion of the
Therefore, in a case where the
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
In FIG. 4, a voltage application time such as the
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
5 also compares the
The interframe 530 can be generated only for the
Accordingly, the first gate line corresponding to the
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
5 shows the waveform of a voltage applied to the gate line in the process of changing to the
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).
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).
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
The term can be multiplied. 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
In
In
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
The
In
The
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)
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.
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.
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.
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.
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:
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 gate driver for selectively driving the first gate line among the plurality of gate lines based on the gate line control signal,
.
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.
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.
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.
Memory for storing input frames
And a display device.
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 control signal generating unit for generating a gate line control signal for controlling the first gate line including the first pixel,
/ RTI >
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.
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.
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.
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