CN105390104B - Liquid crystal display device, scanning driver and driving display method - Google Patents
Liquid crystal display device, scanning driver and driving display method Download PDFInfo
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- CN105390104B CN105390104B CN201510844390.5A CN201510844390A CN105390104B CN 105390104 B CN105390104 B CN 105390104B CN 201510844390 A CN201510844390 A CN 201510844390A CN 105390104 B CN105390104 B CN 105390104B
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- 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
- G09G3/3674—Details of drivers for scan electrodes
Abstract
The invention discloses a liquid crystal display device, a scanning driver and a driving display method, wherein the liquid crystal display device comprises the scanning driver, a data driver and a liquid crystal display panel, the scanning driver comprises a plurality of cascaded shift registers, and each shift register comprises an input end, an output end and a time sequence signal control end; the input end of the first-stage shift register is used for receiving an initial signal STV, the output end of the 2n-1 stage shift register is connected with the input end of the 2 n-stage shift register, the output end of the 2n-1 stage shift register is also connected with the nth row scanning line, and n is a natural number; when the first stage shift register receives another start signal STV through the input terminal at an interval of 2N +1 timing signals CKV, the data driver outputs a black data driving signal to the data line, and N is a natural number. Through the mode, the method and the device can reduce the time for keeping the picture on the screen, reduce the influence on the visual persistence of human eyes and improve motion blur.
Description
Technical Field
The present invention relates to the field of liquid crystal display, and more particularly, to a liquid crystal display device, a scan driver and a driving display method.
Background
In the age of the technology development, liquid crystal displays have become widely used in electronic display products, such as televisions, computer screens, mobile phones, etc. The conventional lcd includes a data driver, a scan driver and an lcd panel, wherein the lcd panel has a pixel array, and the scan driver is used to sequentially turn on corresponding pixel rows in the pixel array, so as to transmit pixel data output by the data driver to the pixels, thereby displaying a picture to be displayed.
The present technology is implemented by using a shift register to sequentially turn on the scan drivers of the corresponding pixel rows in the pixel array. Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of an embodiment of a scan driver in the prior art, and fig. 2 is a timing diagram of an operation corresponding to the scan driver in fig. 1. As shown in fig. 1, the scan driver includes a plurality of shift registers, each shift register having an output, each output controlling a row of scan lines. During display, as shown in fig. 2, each row of pixels is turned on sequentially and continues to change until the next frame.
However, although the image of the liquid crystal display panel changes when the next frame of image signal arrives, the memory of the previous frame of image is still retained when the next frame of image is updated due to the persistence of vision of human eyes, thereby causing a problem that a viewer sees a blurred image.
Disclosure of Invention
The invention mainly solves the technical problem of providing a liquid crystal display device, a scanning driver and a driving display method, which can reduce the time for keeping a picture on a screen so as to reduce the influence on the visual persistence of human eyes and improve motion blur.
In order to solve the technical problems, the invention adopts a technical scheme that: the far liquid crystal display device comprises a scanning driver, a data driver and a liquid crystal display panel, wherein the liquid crystal display panel comprises a display area formed by a plurality of pairwise crossed but non-intersected data lines and scanning lines, the scanning driver is correspondingly connected with each scanning line, and the data driver is correspondingly connected with each data line
The scanning driver comprises a plurality of cascaded shift registers, each shift register comprises an input end, an output end and a time sequence signal control end, the time sequence signal control end of each stage of shift register is used for receiving a time sequence signal CKV, and the frequency of the time sequence signal CKV is doubled; the output end of the 2n-1 stage shift register is connected with the input end of the 2n stage shift register, the output end of the 2n-1 stage shift register is also connected with the nth row of scanning lines, and n is a natural number;
in each frame period, when the input end of the first stage shift register receives a start signal STV at intervals of 2N +1 timing signals CKV, the 2N-1 stage shift register outputs a control signal to the nth row of scan lines through the output end to turn on the scan lines, so as to receive a black data driving signal output by the data driver through the data lines; wherein N is a positive integer.
In the frame period, when the input terminal of the first stage shift register receives a start signal STV at a start time of the frame period, the output terminal of the 2n-1 stage shift register outputs a control signal to the nth row of scan lines to turn on the scan lines, so as to receive an image data driving signal output by the data driver through the data lines.
Wherein the data driver alternately outputs the image data driving signal and the black data driving signal in each line scanning period.
And the on-state maintaining time of the scanning lines in each row is the duration of a time sequence signal CKV.
In order to solve the technical problem, the invention adopts another technical scheme that: the scanning driver comprises a plurality of cascaded shift registers, wherein each shift register comprises an input end, an output end and a timing signal control end, the timing signal control end of each stage of shift register is used for receiving a timing signal CKV, and the frequency of the timing signal CKV is doubled; the output end of the 2n-1 stage shift register is connected with the input end of the 2n stage shift register, the output end of the 2n-1 stage shift register is connected with the nth row of scanning lines, and n is a natural number;
in each frame period, the input terminal of the first stage shift register receives a start signal STV at intervals of 2N +1 timing signals CKV, where N is a positive integer.
In the frame period, when the input terminal of the first stage shift register receives the start signal STV at the start time of the frame period, the output terminal of the 2n-1 stage shift register outputs a control signal to the nth row of scan lines to turn on the scan lines.
And the on-state maintaining time of the scanning lines in each row is the duration of a time sequence signal CKV.
In order to solve the technical problems, the invention adopts another technical scheme that: there is provided a method of driving a display, the method comprising:
when a first time sequence signal CKV is generated, a starting signal STV is sent to a first-stage shift register of a scanning driver, a 2n-1 stage shift register outputs a control signal to an nth row of scanning lines to conduct the corresponding scanning lines so as to receive image data driving signals output by corresponding data lines, and the frequency of the time sequence signal CKV is doubled; the scanning driver comprises a plurality of cascaded shift registers, the output end of the 2n-1 stage shift register is connected with the input end of the 2n stage shift register, the output end of the 2n-1 stage shift register is also connected with the nth row of scanning lines, and n is a natural number;
when a 2N +1 th timing signal CKV is generated, the starting signal STV is sent to the first-stage shift register, and the 2N-1 th-stage shift register outputs a control signal to the nth row of scanning lines to conduct the corresponding scanning lines so as to receive black data driving signals output by the corresponding data lines; n is a positive integer.
And the on-state maintaining time of the scanning lines in each row is the duration of a time sequence signal CKV.
The invention has the beneficial effects that: in distinction from the case of the prior art,
different from the prior art, the lcd device of the present embodiment increases a double shift register from the second stage shift register, controls the conduction of a row of scan lines through two cascaded shift registers, receives a start signal STV through the input terminal at an interval of 2N +1 timing signals CKV within a frame period, and outputs a black data driving signal to the data lines, so that the data frames displayed by the lcd device are switched to black frames line by line until the image data of the next frame arrives. The mode of alternately outputting the image data driving signal and the black data driving signal when the nth row of scanning lines receive the scanning signal output by the scanning driver every time not only obviously relieves the persistence of vision remained in the brain of a human, but also does not have the memory of the previous frame of picture when the next frame of picture arrives, so that the next frame of picture is clearer when the human eyes watch the next frame of picture, the phenomenon of dizziness or blurred vision can not occur any more, and the health of the human eyes is facilitated.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a scan driver of the prior art;
FIG. 2 is a timing diagram of prior art scan driver operation;
FIG. 3 is a schematic diagram of an LCD device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the LCD device of FIG. 3;
FIG. 5 is a timing diagram illustrating operation of one embodiment of the LCD apparatus of FIG. 4;
FIG. 6 is a schematic structural diagram of an embodiment of a scan driver of the present invention;
fig. 7 is a flowchart illustrating a driving display method according to an embodiment of the present invention.
Detailed Description
Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of a liquid crystal display device according to the present invention. As shown in fig. 3, the liquid crystal display device of this embodiment includes a scan driver 301, a data driver 302, and a liquid crystal display panel 303, where the liquid crystal display panel 303 includes a display region 3033 composed of a plurality of data lines 3031 and scan lines 3032 that cross each other two by two but do not intersect with each other, the scan driver 301 is correspondingly connected to each of the scan lines 3032, and the data driver 302 is correspondingly connected to each of the data lines 3031.
Specifically, as shown in fig. 3, the display region 3033 includes a thin film transistor TFT30331 having a gate connected to the scan line 3032 and a source connected to the data line 3021, a drain of the thin film transistor 30331 is connected to one end of the pixel electrode 30332 and one end of the storage capacitor 30333 connected in parallel, respectively, and the other end of the pixel electrode 30332 and the other end of the storage capacitor 30333 are connected to a common electrode. When the liquid crystal display device works, the scanning driver 301 sends scanning signals to the scanning lines 3032 line by line, the scanning lines 3032 are conducted line by line, the corresponding thin film transistor TFT30331 is controlled to be opened, the data driver 302 sends display data to the liquid crystal capacitor 30332 and the storage capacitor 30333 through the data line 3031, the liquid crystal display panel starts to display a display picture, and due to the existence of the storage capacitor 30333, the display data can be stored until the next frame picture is sent.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of the lcd panel of fig. 3. As shown in fig. 4, the scan driver 401 further includes a plurality of cascaded shift registers 401n, which include an input terminal 401n1, an output terminal 401n2, and a timing signal control terminal 401n 3. An input end 40111 of the first-stage shift register 4011 is configured to receive a start signal STV, an output end 4012n-12 of the 2n-1 th-stage shift register 4012n-1 is connected to an input end 4012n1 of the 2 n-th shift register 4012n, an output end 4012n-12 of the 2n-1 th-stage shift register 4012n-1 is further connected to an nth row scan line Gate n, and n is a natural number.
In each frame period, when the first stage shift register 4011 receives a start signal STV through the input terminal 40111 at an interval of 2N +1 timing signals CKV, the 2N-1 stage shift register 4012N-1 outputs a control signal to the nth row of scan lines Gate N through the output terminal 4012N-12 to turn on the scan lines Gate N, so as to receive a black data driving signal output by the data driver 402 to the data line 4031; wherein N is a natural number.
Specifically, referring to fig. 4 and 5, fig. 5 is a timing diagram illustrating operation of one embodiment of the liquid crystal display device of fig. 4. When the start signal STV is at a high level and the timing signal CKV is at a rising edge, the first stage shift register 4011 starts to operate, the OE signal is an output enable signal at a Gate end, and when OE is at a high level, the output of the scan line 4032 is at a low level.
As shown in fig. 4, when the lcd panel starts to work, the first stage shift register 4011 receives a start signal STV through the input terminal 40111 when the timing signal control terminal 40113 receives a timing signal CKV, the cascaded shift registers 401n are sequentially turned on under the driving of the timing signal CKV, the output terminal 4012n-12 of the 2n-1 stage shift register 4012n-1 outputs a control signal to the nth row of scan lines Gate n connected thereto to turn on the scan lines Gate n, and at the same time, the data driver 402 outputs the image data driving signal to the data line 4031, so that the nth row of liquid crystal pixels display normal image data until all the scan lines are driven, and the lcd device completes complete display of a frame. In a frame period, after the interval of 2N +1 timing signals CKV from the start time of the frame period by the input terminal 40111 of the first stage shift register 4011, if the first stage shift register 4011 receives another start signal STV through the input terminal 40111, the data driver 402 outputs a black data driving signal to the data line 4031, so that the data driver 402 alternately outputs the image data driving signal and the black data driving signal in each line scanning period.
For example, at the beginning of the frame period, the first stage shift register 4011 receives a start signal STV, and under the driving of the first stage shift register 4011, the first row scan line Gate 1 outputs a high level and keeps on for a duration of the timing signal CKV, at this time, the data driver 402 outputs an image data driving signal through the data line 4031, and the first row liquid crystal capacitor 40332 displays a normal image, because of the existence and influence of the liquid crystal capacitor 40332 and the storage capacitor 40333, the first row image is continuously displayed normally. After the first stage shift register 4011 turns on a timing signal CKV, the output terminal 40112 sends a control signal to the second stage shift register 4012, and the second stage shift register 4012 is turned on, because the second stage shift register 4012 does not directly drive the scan line Gate 2, the scan line 4032 is not turned on at this time. After a timing signal CKV, the third stage shift register 4013 is turned on, the second stage shift register 4012 sends the control signal to the third stage shift register 4013 through the output terminal 40122, and at this time, the second row of scan lines Gate 2 connected to the output terminal 40132 of the third stage shift register 4013 outputs a high level and keeps a CKV duration. The data driver 402 outputs an image data driving signal to the corresponding data line 4031, and the second row liquid crystal capacitor 40332 displays normal image data. After the third stage shift register 4013 is turned on by a timing signal CKV, the fourth stage shift register 4014 is turned on, and then the fifth stage shift register 4015 is turned on by a timing signal CKV, and the third row of scan lines Gate 3 connected to the output terminal 40152 of the fifth stage shift register 4015 outputs a high level and maintains a CKV duration. The data driver 402 outputs an image data driving signal to the corresponding data line 4031, and the second row liquid crystal capacitor 40332 displays normal image data. After the fifth stage shift register 4015 is turned on by a timing signal CKV, the sixth stage shift register 4016 is turned on without an interval of the timing signal CKV, the next stage shift register 4011 is sequentially turned on, and the scan lines Gate n connected to the output terminal of the 2n-1 stage shift register 4012n-1 sequentially output high levels, and the data driver 402 outputs the image data driving signal to the data line 4031, so that the liquid crystal capacitor 40332 in the nth row displays normal image data. Until all the scanning lines 4032 are driven, the liquid crystal display device completes the complete display of one frame of picture.
When the fifth shift register 4015 is turned on, the scan driver 401 receives 5 timing signals CKV from the start time of the frame period, and when the 6 th timing signal CKV is input, the first shift register 4011 receives a start signal STV through the input terminal 40111, the first shift register 4011 is turned on, and drives the first row of scan lines Gate 1 to output a high level again, and keeps on for a duration of the timing signal CKV, at this time, the data driver 402 outputs a black data driving signal through the data line 4031, and the first row of liquid crystal capacitors 40332 displays a black picture, because of the existence and influence of the liquid crystal capacitors 40332 and the storage capacitor 40333, the first row of pictures keeps displaying a black picture. According to the scanning mode in the above manner, after the first stage shift register 4011 is turned on by a timing signal CKV, the second stage shift register 4012 is turned on, and after the first stage shift register 4011 is turned on by a timing signal CKV, the third stage shift register 4013 is turned on, outputs a high level corresponding to the second row of scan lines Gate 2 connected to the output terminal 40132, and keeps a CKV duration. The data driver 402 outputs a black data driving signal to the corresponding data line 4031, and the second row of liquid crystal capacitors 40332 displays a black data picture, and sequentially scans downward one level at a time until all pictures displayed by the liquid crystal capacitors 40332 are switched to a black picture. When the next frame comes, the first stage shift register 4011 receives the first start signal STV again, the scan lines 4032 are driven by the shift register 401n to be sequentially turned on again, and the data driver 402 outputs the image data of the next frame to the data lines 4031. In fig. 5, active represents that the data driver output data is image data of a screen, and black represents that the data driver output data is black data.
Since the scanning frequency of the scan driver 401 is very high, the human eye cannot perceive the scan, and thus the human eye cannot perceive the existence of the black frame when viewing the image, and thus the normal viewing of the user is not affected. The physical time for actually displaying the image is actually reduced, so that the physical time for actually watching the image by human eyes is shorter than the time for not increasing the black image, the persistence of vision remained in the brain of a human is obviously relieved, and when the next image comes, the memory of the previous image is not provided any more, so that the next image watched by human eyes is clearer, the phenomena of dizziness or blurred vision can not occur any more, and the health of the human eyes is facilitated.
It should be noted that, the above-mentioned embodiment of receiving the start signal STV again after 5 clock signals CKV are separated in the same frame period is only an example, in practical applications, the time of receiving the start signal STV may be adjusted according to the time required to be displayed, for example, after 3 clock signals CKV are separated, that is, the second row of scan lines Gate 2 are turned on, or after 11 clock signals CKV are separated, the first stage shift register receives the second start signal STV, that is, the 5 th row of scan lines Gate 5 is turned on. And so on. Wherein, the smaller the number of the elapsed timing signals CKV, the earlier the time for receiving another start signal STV, i.e., the shorter the time for displaying the data frame, the longer the time for displaying the black data frame. Conversely, the larger the number of elapsed timing signals CKV, the later the time of receiving the second start signal STV, i.e., the longer the time of displaying the data picture, the shorter the time of displaying the black data picture. After the middle scanning line Gate (n/2) is turned on, that is, after the n-1 th shift register 401n-1 is turned on, the start signal STV is received again, and when the black data driving signal outputted by the data driver 402 through the data line 4031 starts to be received, the time length for outputting the image data driving signal is equal to the time length for outputting the black data driving signal.
Note that the frequency of the timing signal CKV in the present embodiment is doubled so as not to affect normal display of the liquid crystal display device.
Different from the prior art, the lcd device of the present embodiment increases a double shift register from the second stage shift register, controls the conduction of a row of scan lines through two cascaded shift registers, receives a start signal STV through the input terminal at an interval of 2N +1 timing signals CKV within a frame period, and outputs a black data driving signal to the data lines, so that the data frames displayed by the lcd device are switched to black frames line by line until the image data of the next frame arrives. The mode of alternately outputting the image data driving signal and the black data driving signal when the nth row of scanning lines receive the scanning signal output by the scanning driver every time not only obviously relieves the persistence of vision remained in the brain of a human, but also does not have the memory of the previous frame of picture when the next frame of picture arrives, so that the next frame of picture is clearer when the human eyes watch the next frame of picture, the phenomenon of dizziness or blurred vision can not occur any more, and the health of the human eyes is facilitated.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a scan driver according to an embodiment of the present invention. The scan driver of the present embodiment comprises a plurality of shift registers 60n connected in series, wherein the shift register 60n comprises an input terminal 60n1, an output terminal 60n2 and a timing signal control terminal 60n3, and the timing signal control terminal 60n3 of each stage of the shift register 60n is used for receiving a timing signal CKV; an input end 6011 of the first stage shift register 601 is configured to receive the start signal STV, an output end 602n-12 of the 2n-1 th stage shift register 602n-1 is connected to an input end 602n2 of the 2n-1 th stage shift register 602n, an output end 602n-12 of the 2n-1 th stage shift register 602n-1 is connected to the nth row scan line Gate n, n is a natural number.
In each frame period, when the input end 6011 of the first stage shift register 601 receives a timing signal CKV at the start time of the frame period and the timing signal control end 6013 receives a timing signal CKV, the first start signal STV is received, so that the output end 602n-12 of the 2n-1 th stage shift register 602n-1 sends a scan signal to the nth scan line Gate n to drive the data driver to output the image data driving signal to the data line; the input terminal 6011 of the first stage shift register 601 is further configured to receive a second start signal STV through the input terminal 6011 at an interval of 2N +1 timing signals CKV, so as to drive the data driver to output a black data driving signal to the data lines.
Specifically, in each frame period, when the scan driver starts to operate, the first stage shift register 601 sequentially opens the cascaded shift registers 60n under the driving of the timing signal CKV when receiving the start signal STV at the start time of the frame period, the output end 602n-12 of the 2n-1 stage shift register 602n-1 outputs a control signal to the nth row of scan lines Gate n connected thereto to turn on the scan lines Gate n, and at the same time, the data driver outputs the image data driving signal to the data lines to make the nth row of liquid crystal pixels display normal image data until all the scan lines are driven, so that the liquid crystal display device completes the complete display of a frame.
After receiving a timing signal CKV at the start time of the frame period and after 2N +1 timing signals CKV are spaced, if the first stage shift register 601 receives another start signal STV through the input end 6011, the cascaded shift registers 60N are sequentially turned on again, the output end 602N-12 of the 2N-1 stage shift register 602N-1 outputs a control signal to the nth row of scan lines Gate N connected thereto to turn on the scan lines Gate N, and the turn-on maintaining time of each row of scan lines Gate N is a duration of the timing signal CKV, so as to drive the data driver to output a black data driving signal to the data lines, so that the nth row of liquid crystal pixels display a black data picture until all the pictures displayed by the liquid crystal pixels are switched to a black picture. When the next frame comes, at the start time of the frame period, the first stage shift register 601 receives a start signal STV again, the scan lines Gate n are driven by the shift register 60n to be turned on again, and the data driver outputs the image data of the next frame to the data lines.
Because the scanning frequency of the scanning driver is very high, the scanning driver can not be detected by human eyes, and therefore, the human eyes can not sense the existence of the black picture when watching, and the normal watching of a user can not be influenced. Since the physical time for actually displaying the image picture is actually reduced, the physical time for human eyes to actually view the image picture is shorter than the time for which the black picture is not added.
It should be noted that, in practical applications, in a frame period, the time for receiving the start signal STV may be adjusted according to the time required to be displayed, for example, after 3 timing signals CKV are passed, that is, after the second row of scan lines Gate 2 is turned on, or after 11 timing signals CKV are passed, the first stage shift register 601 receives the second start signal STV, that is, after the 5 th row of scan lines Gate 5 is turned on. And so on. Wherein, the smaller the number of the elapsed timing signals CKV, the earlier the time for receiving another start signal STV, i.e., the shorter the time for displaying the data frame, the longer the time for displaying the black data frame. Conversely, the larger the number of elapsed timing signals CKV, the later the time of receiving the second start signal STV, i.e., the longer the time of displaying the data picture, the shorter the time of displaying the black data picture. After the middle scanning line Gate (n/2) is turned on, that is, the (n-1) th stage shift register 60n is turned on, the start signal STV is received again, and when the black data driving signal outputted from the data driver through the data line starts to be received, the time length for outputting the image data driving signal is equal to the time length for outputting the black data driving signal.
Note that the frequency of the timing signal CKV in the present embodiment is doubled so as not to affect normal display of the liquid crystal display device.
Different from the prior art, the scan driver of the embodiment correspondingly increases a double shift register from the second stage shift register, controls the conduction of a row of scan lines through two cascaded shift registers, receives a start signal STV through the input terminal at an interval of 2N +1 timing signals CKV within a frame period, and outputs a black data driving signal to the data lines, so that the data frames displayed by the liquid crystal display are switched into black frames line by line until the image data of the next frame arrives. The mode of alternately outputting the image data driving signal and the black data driving signal when the nth row of scanning lines receive the scanning signal output by the scanning driver every time not only obviously relieves the persistence of vision remained in the brain of a human, but also does not have the memory of the previous frame of picture when the next frame of picture arrives, so that the next frame of picture is clearer when the human eyes watch the next frame of picture, the phenomenon of dizziness or blurred vision can not occur any more, and the health of the human eyes is facilitated.
Referring to fig. 7, fig. 7 is a schematic flowchart illustrating a driving display method according to an embodiment of the present invention, wherein the driving display method according to the embodiment is applied to the liquid crystal display device and the scan driver according to any one of the embodiments of fig. 3 to 6. The method specifically comprises the following steps:
701: when the first timing signal CKV is generated, the start signal STV is sent to the first stage shift register of the scan driver, and the 2n-1 th stage shift register outputs a control signal to the nth row of scan lines to turn on the corresponding scan lines, so as to receive the image data driving signal output by the corresponding data lines.
The scanning driver comprises a plurality of cascaded shift registers, the output end of the 2n-1 stage shift register is connected with the input end of the 2n stage shift register, the output end of the 2n-1 stage shift register is also connected with the nth row of scanning lines, and n is a natural number;
when a 2N +1 th timing signal CKV is generated, the starting signal STV is sent to the first-stage shift register, and the 2N-1 th-stage shift register outputs a control signal to the nth row of scanning lines to conduct the corresponding scanning lines so as to receive black data driving signals output by the corresponding data lines; n is a positive integer.
Specifically, in each frame period, when the scan driver starts to operate, the first stage shift register receives an initial signal STV at the initial time of the frame period, the cascaded shift registers are sequentially turned on under the driving of a timing signal CKV, the output end of the 2n-1 stage shift register outputs a control signal to the nth row of scan lines connected thereto to turn on the scan lines, and at the same time, the data driver outputs the image data driving signal to the data lines, so that the nth row of liquid crystal pixels display normal image data until the driving of all the scan lines is completed, and the liquid crystal display device completes the complete display of one frame.
702: when a 2N +1 th timing signal CKV is generated, the starting signal STV is sent to the first-stage shift register, and the 2N-1 th-stage shift register outputs a control signal to the nth row of scanning lines to conduct the corresponding scanning lines so as to receive black data driving signals output by the corresponding data lines; n is a positive integer.
After receiving a timing signal CKV at the initial time of the frame period and after 2N +1 timing signals CKV are spaced, if the first-stage shift register receives another initial signal STV through the input end, the cascaded shift registers are sequentially opened again, the output end of the 2N-1 stage shift register outputs a control signal to the nth row of scanning lines connected with the first-stage shift register to conduct the scanning lines, and the conduction maintaining time of each row of scanning lines is the duration of one timing signal CKV to drive the data driver to output a black data driving signal to the data lines, so that the nth row of liquid crystal pixels display black data pictures until all the pictures displayed by the liquid crystal pixels are switched into the black pictures. And when the next frame of picture comes, at the starting time of the frame period, the first-stage shift register receives a starting signal STV again, the scanning lines are driven by the shift register to be opened again in sequence, and the data driver outputs the image data of the next frame of picture to the data lines.
Because the scanning frequency of the scanning driver is very high, the scanning driver can not be detected by human eyes, and therefore, the human eyes can not sense the existence of the black picture when watching, and the normal watching of a user can not be influenced. Since the physical time for actually displaying the image picture is actually reduced, the physical time for human eyes to actually view the image picture is shorter than the time for which the black picture is not added.
It should be noted that, in practical applications, in a frame period, the time for receiving the start signal STV may be adjusted according to the time required to be displayed, for example, after 3 timing signals CKV are passed, that is, after the second row of scan lines Gate 2 is turned on, or after 11 timing signals CKV are passed, the first stage shift register 601 receives the second start signal STV, that is, after the 5 th row of scan lines Gate 5 is turned on. And so on. Wherein, the smaller the number of the elapsed timing signals CKV, the earlier the time for receiving another start signal STV, i.e., the shorter the time for displaying the data frame, the longer the time for displaying the black data frame. Conversely, the larger the number of elapsed timing signals CKV, the later the time of receiving the second start signal STV, i.e., the longer the time of displaying the data picture, the shorter the time of displaying the black data picture. After the middle scanning line Gate (n/2) is turned on, that is, after the nth-1 stage shift register is turned on, the start signal STV is received again, and when the black data driving signal output by the data driver through the data line starts to be received, the time length for outputting the image data driving signal is equal to the time length for outputting the black data driving signal.
Note that the frequency of the timing signal CKV in the present embodiment is doubled so as not to affect normal display of the liquid crystal display device.
Different from the prior art, the scan driver of the embodiment sends the start signal STV to the first stage shift register of the scan driver when generating the first timing signal CKV, the 2N-1 th stage shift register outputs the control signal to the nth row scan line to turn on the corresponding scan line to receive the image data driving signal output by the corresponding data line, sends the start signal STV to the first stage shift register when generating the 2N +1 th timing signal CKV, and the 2N-1 th stage shift register outputs the control signal to the nth row scan line to turn on the corresponding scan line to receive the black data driving signal output by the corresponding data line. Starting from the second stage shift register, a doubling shift register is correspondingly added, the conduction of a row of scanning lines is controlled by two cascaded shift registers, another starting signal STV is received by an input end at an interval of 2N +1 timing signals CKV, a data driver is driven to output a black data driving signal to the data lines, and the data pictures displayed by the liquid crystal display are switched into black pictures line by line until the image data of the next frame picture arrives. The mode of alternately outputting the image data driving signal and the black data driving signal when the nth row of scanning lines receive the scanning signal output by the scanning driver every time not only obviously relieves the persistence of vision remained in the brain of a human, but also does not have the memory of the previous frame of picture when the next frame of picture arrives, so that the next frame of picture is clearer when the human eyes watch the next frame of picture, the phenomenon of dizziness or blurred vision can not occur any more, and the health of the human eyes is facilitated.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A liquid crystal display device comprises a scanning driver, a data driver and a liquid crystal display panel, wherein the liquid crystal display panel comprises a display area which is composed of a plurality of data lines and scanning lines which are crossed in pairs but not intersected, the scanning driver is correspondingly connected with each scanning line, the data driver is correspondingly connected with each data line, the liquid crystal display device is characterized in that,
the scanning driver comprises a plurality of cascaded shift registers, each shift register comprises an input end, an output end and a time sequence signal control end, the time sequence signal control end of each stage of shift register is used for receiving a time sequence signal CKV, and the frequency of the time sequence signal CKV is doubled; the output end of the 2n-1 stage shift register is connected with the input end of the 2n stage shift register, the output end of the 2n-1 stage shift register is also connected with the nth row of scanning lines, and n is a natural number;
in each frame period, when the input end of the first stage shift register receives a start signal STV at intervals of 2N +1 timing signals CKV, the 2N-1 stage shift register outputs a control signal to the nth row of scan lines through the output end to turn on the scan lines, so as to receive a black data driving signal output by the data driver through the data lines; wherein N is a positive integer.
2. The lcd apparatus of claim 1, wherein when the input terminal of the first stage shift register receives the start signal STV at a start time of the frame period during the frame period, the output terminal of the 2n-1 stage shift register outputs a control signal to the nth row of scan lines to turn on the scan lines to receive the image data driving signal outputted from the data driver through the data lines.
3. The liquid crystal display device according to claim 2, wherein the data driver alternately outputs the image data driving signal and the black data driving signal in each line scanning period.
4. The liquid crystal display device of claim 3, wherein each turn-on maintaining time of the scan line for each row is a duration of the clock signal CKV.
5. The liquid crystal display device according to claim 3, wherein a time period for outputting the image data driving signal is equal to a time period for outputting the black data driving signal in each of the line scanning periods.
6. A scan driver, comprising: the shift register comprises an input end, an output end and a time sequence signal control end, wherein the time sequence signal control end of each stage of the shift register is used for receiving a time sequence signal CKV, and the frequency of the time sequence signal CKV is doubled; the output end of the 2n-1 stage shift register is connected with the input end of the 2n stage shift register, the output end of the 2n-1 stage shift register is connected with the nth row of scanning lines, and n is a natural number;
in each frame period, the input terminal of the first stage shift register receives a start signal STV at intervals of 2N +1 timing signals CKV, where N is a positive integer.
7. The scan driver of claim 6, wherein during the frame period, when the input terminal of the first stage shift register receives the start signal STV at a start time of the frame period, the output terminal of the 2n-1 stage shift register outputs a control signal to the scan line of the n-th row to turn on the scan line.
8. The scan driver of claim 6, wherein each turn-on duration of the scan line of each row is one duration of the timing signal CKV.
9. A method of driving a display, the method comprising:
when a first time sequence signal CKV is generated, a starting signal STV is sent to a first-stage shift register of a scanning driver, a 2n-1 stage shift register outputs a control signal to an nth row of scanning lines to conduct the corresponding scanning lines so as to receive image data driving signals output by corresponding data lines, and the frequency of the time sequence signal CKV is doubled; the scanning driver comprises a plurality of cascaded shift registers, the output end of the 2n-1 stage shift register is connected with the input end of the 2n stage shift register, the output end of the 2n-1 stage shift register is also connected with the nth row of scanning lines, and n is a natural number;
when a 2N +1 th timing signal CKV is generated, the starting signal STV is sent to the first-stage shift register, and the 2N-1 th-stage shift register outputs a control signal to the nth row of scanning lines to conduct the corresponding scanning lines so as to receive black data driving signals output by the corresponding data lines; n is a positive integer.
10. The driving method of claim 9, wherein each turn-on hold time of the scan line of each row is one duration of the timing signal CKV.
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| KR100705617B1 (en) * | 2003-03-31 | 2007-04-11 | 비오이 하이디스 테크놀로지 주식회사 | Liquid crystal driving device |
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