CN102376279B - Liquid crystal display device and driving method thereof - Google Patents
Liquid crystal display device and driving method thereof Download PDFInfo
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- CN102376279B CN102376279B CN201010251927.4A CN201010251927A CN102376279B CN 102376279 B CN102376279 B CN 102376279B CN 201010251927 A CN201010251927 A CN 201010251927A CN 102376279 B CN102376279 B CN 102376279B
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Abstract
The invention relates to a liquid crystal display device and a driving method thereof. The liquid crystal display device comprises a time sequence control circuit, a scanning driving circuit, a data driving circuit and a liquid crystal display panel, and the liquid crystal display panel comprises multiple pixels. The time sequence control circuit comprises a data analysis module, wherein the data analysis module is used for receiving and analyzing every frame of image data; in n lines of the pixels which are displayed continuously in one frame of the image data, when m lines of pixels which are displayed continuously display a black picture (n>=4, n>m>=2), the data analysis module outputs a first polarity inversion control signal to the data driving circuit, the data driving circuit is used for processing a data signal according to the first polarity inversion control signal so as to generate a plurality of gray scale voltages and the gray scale voltages are provided to the liquid crystal display panel; and when the plurality of pixels of the liquid crystal display panel display the frame of image, in the m lines of the pixels, which are displayed continuously and display the black picture, the polarities of all the pixels positioned in the same line are the same.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator and driving method thereof.
Background technology
The characteristics such as volume is little because having for liquid crystal indicator, quality is light, thin thickness, power consumption are low, do not glimmer, radiation is few, have been widely used in the electronic equipments such as TV, notebook computer, mobile phone, personal digital assistant.
Liquid crystal indicator generally includes display panels and provides the backlight module of planar light for this display panels.This display panels generally includes public electrode, pixel electrode and a plurality of liquid crystal molecule that driven by this public electrode and this pixel electrode and reverse.When be applied between this public electrode and pixel electrode change in voltage time, the windup-degree of this liquid crystal molecule is different, thus the light percent of pass of this display panels is different, cooperation colored filter can be realized the demonstration of different pictures.
Yet, it is found that, liquid crystal indicator is carrying out data processing or image while showing, often can produce the noise as buzzing, and industry is called: audible noise (Audible Noise).Due to the existence of audible noise, not only cause user quietly under environment, working and to live, and seriously, also may allow user think that liquid crystal indicator damages, and causes the inconvenience in live and work by mistake.
Summary of the invention
For liquid crystal indicator in solution prior art produces the technical matters of audible noise, be necessary to provide a kind of liquid crystal indicator that can improve audible noise.
Also be necessary to provide a kind of driving method that can improve the liquid crystal indicator of audible noise.
A kind of liquid crystal indicator, it comprises a sequential control circuit, scan driving circuit, one data drive circuit and a display panels, this display panels comprises a plurality of pixels, this sequential control circuit comprises a time-sequence control module, this time-sequence control module receives each frame image data, and produce clock signal and data-signal according to this view data, and export this clock signal to this data drive circuit and scan drive circuit to control work schedule, and export data-signal to this data drive circuit, this data drive circuit and scan drive circuit are for driving a plurality of pixels of this display panels to show image.This sequential control circuit also comprises a data analysis module, this data analysis module is for receiving and analyze each frame image data, in the capable pixel of n of the continuous demonstration of a frame image data, when the capable pixel of m showing continuously shows black picture, n≤4 wherein, n > m≤2, m and n are natural number, this data analysis module output one first reversal of poles controls signal to this data drive circuit, this data drive circuit is processed and is produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, while making a plurality of pixels of this display panels show this two field picture, in this continuous capable pixel of m that show and that show black picture, the polarity of all pixels that is positioned at same row is identical.
A kind of liquid crystal indicator, it comprises a sequential control circuit, scan driving circuit, one data drive circuit and a display panels, this display panels comprises a plurality of pixels, this sequential control circuit comprises a time-sequence control module, this time-sequence control module receives each frame image data, and produce clock signal and data-signal according to this view data, and export this clock signal to this data drive circuit and scan drive circuit to control work schedule, and export data-signal to this data drive circuit, this data drive circuit and scan drive circuit are for driving a plurality of pixels of this display panels to show image.This sequential control circuit also comprises a data analysis module, this data analysis module is for receiving and analyze each frame image data, in the capable pixel of n of the continuous demonstration of a frame image data, the capable pixel of m showing continuously shows when black picture and the capable pixel of other n-m show white picture, n≤4 wherein, n > m≤2, m and n are natural number, this data analysis module output one first reversal of poles controls signal to this data drive circuit, this data drive circuit is processed and is produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, while making a plurality of pixels of this display panels show this two field picture, in this continuous capable pixel of m that show and that show black picture, the polarity of all pixels that is positioned at same row is identical.
A kind of liquid crystal indicator, it comprises a sequential control circuit, scan driving circuit, one data drive circuit and a display panels, this display panels comprises a plurality of pixels, this sequential control circuit comprises a time-sequence control module, this time-sequence control module receives each frame image data, and produce clock signal and data-signal according to this view data, and export this clock signal to this data drive circuit and scan drive circuit to control work schedule, and export data-signal to this data drive circuit, this data drive circuit and scan drive circuit are for driving a plurality of pixels of this display panels to show image.This sequential control circuit also comprises a data analysis module, this data analysis module is for receiving and analyze each frame image data, in the capable pixel of n of the continuous demonstration of a frame image data, the capable pixel of m showing continuously shows when the pixel that has at least two row to show continuously in black picture and the capable pixel of other n-m shows white picture, n≤4 wherein, n > m≤2, m and n are natural number, this data analysis module output one first reversal of poles controls signal to this data drive circuit, this data drive circuit is processed and is produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, while making a plurality of pixels of this display panels show this two field picture, in this continuous capable pixel of m that show and that show black picture, the polarity of all pixels that is positioned at same row is identical.
A kind of liquid crystal indicator, it comprises a sequential control circuit, scan driving circuit, one data drive circuit and a display panels, this display panels comprises a plurality of pixels, this sequential control circuit comprises a time-sequence control module, this time-sequence control module receives each frame image data, and produce clock signal and data-signal according to this view data, and export this clock signal to this data drive circuit and scan drive circuit to control work schedule, and export data-signal to this data drive circuit, this data drive circuit and scan drive circuit are for driving a plurality of pixels of this display panels to show image.This sequential control circuit also comprises a data analysis module, this data analysis module is for receiving and analyze each frame image data, in the capable pixel of n of the continuous demonstration of a frame image data, when the capable pixel of m showing continuously shows black picture, and the pixel that has at least two row to show continuously in the capable pixel of other n-m shows white picture, n≤4 wherein, n > m≤2, m and n are natural number, this data analysis module output one first reversal of poles controls signal to this data drive circuit, this data drive circuit is processed and is produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, make a plurality of pixels of this display panels show this two field picture to be listed as the mode of reversion.
A driving method for liquid crystal indicator, this driving method comprises the steps: to receive view data; And analyze this view data, in the capable pixel of arbitrary continuation n of the two field picture that this liquid crystal indicator wish shows, there is the capable pixel of continuous m to show black picture, n≤4 wherein, m≤2 o'clock, m and n are natural number, and when controlling the capable pixel that shows black picture of this continuous m and showing, the polarity that is positioned at same row pixel is not reversed.
Compared with prior art, in liquid crystal indicator of the present invention and driving method thereof, by view data is analyzed, in the capable pixel of n of the continuous demonstration of a frame image data, when the capable pixel of m showing continuously shows black picture, n≤4 wherein, n > m≤2, m and n are natural number, when a plurality of pixels of controlling this display panels show this two field picture, this is continuously in capable pixel of m that show and that show black picture, and the polarity of all pixels that is positioned at same row is identical.Thus, this that is positioned at same row shows that the capable pixel of m of black picture does not exist polarity to switch, therefore when the capable pixel of this m shows, change in voltage on this column data line is less, and then the less difficult generation of the charging and discharging currents instantaneous variation of the ceramic condenser on printed circuit board (PCB) expands and shrink, thereby the phenomenon that corresponding printed circuit board (PCB) produces audible noise is enhanced.
Accompanying drawing explanation
Fig. 1 is the schematic equivalent circuit of liquid crystal indicator one better embodiment of the present invention.
Fig. 2 is the schematic diagram of row reversion and frame inversion driving mode.
Fig. 3 is the schematic diagram of several common inversion driving modes.
Fig. 4 is the circuit block diagram of data analysis module first embodiment of the liquid crystal indicator shown in Fig. 1.
Fig. 5 is a kind of distortion embodiment illustrated in fig. 4.
Fig. 6 is the circuit block diagram of data analysis module second embodiment of the liquid crystal indicator shown in Fig. 1.
Fig. 7 is the process flow diagram of the driving method of liquid crystal indicator shown in Fig. 1.
Main element symbol description
Liquid crystal indicator 100
Sequential control circuit 110
Data analysis module 120,220
Time-sequence control module 130
Data drive circuit 140
Scan drive circuit 150
Display panels 160
Sweep trace 161
Data line 163
Pixel 165
Thin film transistor (TFT) 167
Liquid crystal capacitance 169
Buffer 121,221
Decision circuitry 123,223
Reversal of poles control circuit 125,225
Tandom number generator 122
Data control circuit 124,228
Data comparator 226
Counter 227
Embodiment
For improving the phenomenon of the audible noise of liquid crystal indicator generation, the reason that first the present invention produces audible noise is studied and analyzes.Particularly, we find, when one of source of audible noise is liquid crystal indicator work, its printed circuit board (PCB) produces that vibration causes.For suppressing the noise of printed circuit board (PCB) generation of vibration, can provide acoustical cotton that printed circuit board (PCB) is coated, yet acoustical cotton belong to combustible material, this improvement scheme makes liquid crystal indicator have the higher unsafe factor of burning risk.
Further profound level is analyzed the source of noise, we find: the noise (audible noise) that falls into human auditory system scope mainly produces when showing some specific picture at liquid crystal indicator, and when liquid crystal indicator shows nonspecific picture, noise is very little, and is conventionally difficult for being realized.For instance, in the pixel that the matrix of liquid crystal indicator is arranged, if there is multirow pixel continuously, show white picture, and the continuous multirow pixel adjacent with above-mentioned pixel is while showing the situation of black picture, will produce larger audible noise.
By analysis, find, when liquid crystal indicator shows the specific picture of this type, when wherein black picture carries out polarity switching, because the variation of the voltage on same data line is larger, make the charging and discharging currents instantaneous variation of the ceramic condenser on printed circuit board (PCB) larger, and then the dielectric of ceramic condenser expands at direction of an electric field, in the plane perpendicular to this direction of an electric field, shrink, thereby cause expansion and the contraction of printed circuit board (PCB), produce noise and vibration.Thus, according to above-mentioned analysis result, the invention provides following embodiment and improve audible noise.
Refer to Fig. 1, the schematic equivalent circuit of its liquid crystal indicator the first embodiment of the present invention.This liquid crystal indicator 100 comprises a sequential control circuit 110, a data drive circuit 140, scan driving circuit 150 and a display panels 160.This sequential control circuit 110 comprises a data analysis module 120 and a time-sequence control module 130.
This time-sequence control module 130 receives each frame image data, and produce clock signal and data-signal according to this view data, and export this clock signal to this data drive circuit 140 and scan drive circuit 150 to control work schedule, and export data-signal to this data drive circuit 140.This data analysis module 120 is for receiving and analyze each frame image data, and according to analysis result output polarity reverse control signal to this data drive circuit 140, to control the reversal of poles mode (reversal of poles characteristic in other words) of each two field picture.In concrete application, this sequential control circuit 110 can be an integrated chip, and this data analysis module 120 and time-sequence control module 130 are integrated in a chip.Certainly in change embodiment, this sequential control circuit 110 also can comprise respectively that the chip and of this data analysis module 120 comprises the chip of this time-sequence control module 130.
This scan drive circuit 150 is for receiving this clock signal, and under the control of this clock signal, provides series of scanning signals to this display panels 160.This data drive circuit 140 is for receiving this data-signal, clock signal and this reversal of poles control signal, and when this display panels 160 is scanned, exports a plurality of gray scale voltages to this display panels 160.Particularly, thereby this data drive circuit 140 carries out data processing according to this reversal of poles control signal to this data-signal, produce a plurality of gray scale voltages, and under the control of this clock signal, the plurality of gray scale voltage is provided to display panels 160.This display panels 160 receives this series of scanning signals and a plurality of gray scale voltage is realized picture disply.
This display panels 160 comprises that multi-strip scanning line 161, many data lines 163 and a plurality of sweep trace 161 and data line 163 intersect a plurality of pixels 165 that define.Each pixel 165 comprises a thin film transistor (TFT) 167 and a liquid crystal capacitance 169, and wherein, the grid of this thin film transistor (TFT) 167 connects corresponding one scan line 161, and source electrode connects a corresponding data line 163, and drain electrode connects this liquid crystal capacitance 169.
A plurality of pixels 165 that definition is connected with same sweep trace 161 are one-row pixels 165, and a plurality of pixels 165 that are connected with same data line 163 are a row pixel 165.This multi-strip scanning line 161 is electrically connected to this scan drive circuit 150, for receiving this series of scanning signals.These many data lines 163 are electrically connected to this data drive circuit 140, for receiving the plurality of gray scale voltage, and under the control of this series of scanning signals, the plurality of gray scale voltage are sequentially provided to the plurality of pixel 165.Particularly, this series of scanning signals is a plurality of high level pulses, this multi-strip scanning line 161 is sequentially applied the plurality of high level pulse, when a sweep trace 161 is applied in high level pulse, the thin film transistor (TFT) 167 of the one-row pixels 165 being connected with this sweep trace 161 is opened, now a plurality of gray scale voltages on these many data lines 163 are write respectively a plurality of liquid crystal capacitances 169 of this row pixel 165, and this row pixel 165 realizes picture disply.Further, if two or multi-strip scanning line 161 sweep signal that is applied in continuous in time, two row that definition is connected with these two or multi-strip scanning line 161 or multirow pixel 165 are for showing continuously.For conventional driving, two row pixels 165 on two adjacent sweep traces 161 are applied in sweep signal continuously due to these two sweep traces 161 conventionally, therefore belong to two row pixels 165 of continuous demonstration.
For instance, all pixels 165 that are connected with article one sweep trace 161 are defined as the first row pixel 165, and all pixels 165 that are connected with article one data line 163 are defined as first row pixel 165.If article one sequentially applied sweep signal with second sweep trace 161, this first row pixel 165 and the second row pixel 165 are the pixel 165 showing continuously.Article one, the 3rd and the 5th sweep trace 161 sequentially applied sweep signal, if, this first row, the second row and fifth line pixel 165 are the pixel 165 showing continuously.
Further, when a plurality of pixels 165 of this display panels 160 show a two field picture, if lower than one first predetermined GTG, defining this pixel 165, the GTG that a pixel 165 shows shows black picture.For instance, for the image of 256 GTGs, this first predetermined GTG can be 32 GTGs, and preferably, the first predetermined GTG can be also 16 GTGs.Relatively, if higher than one second predetermined GTG, defining this pixel 165, the GTG that a pixel 165 shows shows white picture.For instance, for the image of 256 GTGs, this second predetermined GTG can be 200 GTGs, and preferably, the second predetermined GTG can be also 224 GTGs.Certainly, the value of this first, second predetermined GTG also can be set according to actual needs.
Further, when a plurality of pixels 165 of this display panels 160 show a two field picture, if one-row pixels 165 comprises more than 70% pixel and shows black picture, define this journey pixel 165 and show black picture, this row pixel 165 belongs to the pixel column that shows black picture.Relatively, if one-row pixels 165 comprises more than 70% pixel 165, show white picture, define this journey pixel 165 and show white picture, this row pixel 165 belongs to the pixel column that shows white picture.Certainly, above-mentioned number percent also can change according to actual needs, such as: in other changes embodiment, can define one-row pixels 165 and comprise that more than 90% pixel 165 shows black picture (or white picture), is defined as this journey pixel 165 pixel column that shows black picture (or white picture).
Particularly, when 120 pairs of frame image datas of this data analysis module are analyzed, in the capable pixel 165 of n of the continuous demonstration of a frame image data, when the capable pixel 165 of m showing continuously shows black picture, n≤4 wherein, n > m≤2, m and n are natural number, and these data analysis module 120 output one first reversal of poles control signal to this data drive circuit 140.This data drive circuit 140 is processed and is produced a plurality of gray scale voltages and provide to this display panels 160 this data-signal according to this first reversal of poles control signal, while making a plurality of pixels 165 this two field picture of demonstration of this display panels 160, in this continuous capable pixel 165 of m that show and that show black picture, be positioned at the polarity identical (being that polarity does not change) of all pixels 165 of same row.
Further, in one embodiment, when 120 pairs of frame image datas of this data analysis module are analyzed, only have in the capable pixel 165 of n of the continuous demonstration of working as a frame image data, the capable pixel 165 of m showing continuously shows when black picture and the capable pixel 165 of other n-m show white picture, these data analysis module 120 these the first reversal of poles control signals of output.For instance, in this frame image data, n=6, during m=3,3 row (m the is capable) pixel 165 that comprises continuous demonstration shows black picture, when other 3 row (n-m is capable) pixels 165 show white picture, and these data analysis module 120 these the first reversal of poles control signals of output.
In a kind of change embodiment, when 120 pairs of frame image datas of this data analysis module are analyzed, only have in the capable pixel 165 of n of the continuous demonstration of working as a frame image data, the capable pixel 165 of m showing continuously shows black picture, in the capable pixel 165 of other n-m, have at least the pixel 165 that two row show continuously to show white picture, these data analysis module 120 these the first reversal of poles control signals of output.For instance, in this frame image data, n=6, during m=3,3 row (m the is capable) pixel 165 that comprises continuous demonstration shows black picture, while having the continuous pixel showing 165 of two row to show white picture in other 3 row (n-m is capable), and these data analysis module 120 these the first reversal of poles control signals of output.
More specifically, when this data drive circuit 140 is controlled the reversal of poles mode of a two field picture according to this first reversal of poles control signal, in one embodiment, in the time of can controlling a plurality of pixels 165 this two field picture of demonstration of this display panels 160, the polarity of all pixels 165 that is positioned at same row is all identical, particularly, a plurality of pixels 165 that this data drive circuit 140 can be controlled this display panels 160 according to this first reversal of poles control signal show this two field picture in the mode of row reversion or frame reversion.Wherein, row reversions comprises single-row reversion and biserial reversion, consults Fig. 2, single-row reversion, biserial reversion and frame reversion respectively as shown in Fig. 2 (1), (2) and (3).
Further, when 120 pairs of frame image datas of this data analysis module are analyzed, when a frame image data does not meet the situation of above-mentioned " in the capable pixel 165 of n showing continuously; the capable pixel 165 of m showing continuously shows black picture; n≤4 wherein; n > m≤2 ", this data analysis module 120 can be exported one second reversal of poles and control signal to this data drive circuit 140.This data drive circuit 140 is processed and is produced a plurality of gray scale voltages and provide to this display panels 160 this data-signal according to this second reversal of poles control signal, makes a plurality of pixels 165 of this display panels 160 show this two field picture with common inversion driving mode.Refer to Fig. 3, it is the schematic diagram of several common inversion driving modes.This common inversion driving mode can be that a reversion, a line add two line reversions, single line reversion or two-wire reversion, and its mid point reversion, a line add two line reversions, single line reversion and two-wire reversion respectively as shown in Fig. 3 (1), (2), (3) and (4).
Refer to Fig. 4, it is the schematic diagram of the first embodiment of this data analysis module 120.This data analysis module 120 comprises a buffer 121, a decision circuitry 123 and a reversal of poles control circuit 125.This buffer 121 is for each frame image data sequentially receiving and temporary external circuit (as: Low Voltage Differential Signal connector) provides, this decision circuitry 123 is for reading each frame image data of these buffer 121 storages, and this each frame image data is analyzed, and control this reversal of poles control circuit 125 this first reversal of poles control signal of output or the second reversal of poles control signals according to analysis result.Please further consult Fig. 5, in a kind of change embodiment, this buffer 121 can further provide the view data of its storage to this time-sequence control module 130, and then this time-sequence control module 130 can receive view data and view data is carried out to data processing.
This decision circuitry 123 comprises a tandom number generator 122, a data control circuit 124.This tandom number generator 122 sequentially produces many group random numbers and provides this many groups random number to this data control circuit 124.Every group of random number comprises k addressing address, k pixel data in this k the corresponding one-row pixels 165 of addressing address difference.This data control circuit 124 reads k pixel data in one-row pixels in the frame image data from this buffer 121 according to this k addressing address, and analyze this k pixel data.If the data of this k pixel have seven ten at least percent pixel data to belong to black picture data, this row pixel 165 belongs to the pixel column that shows black picture.The further analysis to k pixel data according to above-mentioned analysis of this data control circuit 124, to described black picture pixel, capable and total number of lines of pixels is counted, when there being above-mentioned n≤4, during the situation of n > m≤2, this data control circuit 124 is controlled this reversal of poles control circuit 125 these the first reversal of poles control signals of output; Otherwise this data control circuit 124 is controlled this reversal of poles control circuit 125 these the second reversal of poles control signals of output.Wherein, the value of k can be set according to actual needs, as is set in k=200.In preferred embodiment, if this k pixel data all belongs to black picture data, these data control circuit 124 these row pixels 165 of judgement belong to the pixel column that shows black picture.
In one embodiment, every group of random number can comprise two parts, and these two parts are defined as respectively a first and second portion, and the random number of these two parts is successively twice generation of this tandom number generator.That is to say, may there is with the random number of second portion the situation that part is identical in the random number of first, thereby may there is the situation that part is identical in k2 the addressing address corresponding with the random number of second portion, k1 addressing address corresponding to random number of this first.For instance, if the value of every group of random number is k=200, k1=100, k2=100, this tandom number generator 122 first produces 100 random numbers of first, produce again 100 random numbers of second portion, 100 random numbers of Er Gai first may be identical with 100 random number parts of this second portion, therefore, 100 addressing addresses corresponding with the random number of second portion, 100 addressing addresses corresponding to 100 random numbers of first are may parts identical, and then in the process of 200 pixel datas that read according to these 200 addressing addresses, correspondingly may occur that partial pixel data are read and have analyzed twice.This tandom number generator 122 at twice or more times produce every group of random number, relatively can reach the analysis result effect more accurately that makes this data control circuit 124.
Further, in one embodiment, this data control circuit 124 can be analyzed each data of this k pixel data, if this k pixel data has seven ten at least percent data to belong to white picture data, this row pixel 165 belongs to the pixel column that shows white picture.When this data control circuit 124 is found by counting: in the capable pixel of n showing continuously, the capable pixel of m showing continuously shows black picture, n≤4, n > m≤2, and the pixel that has at least two row to show continuously in the capable pixel of other n-m shows white picture, this data control circuit 124 is controlled this reversal of poles control circuit 125 these the first reversal of poles control signals of output output.Preferably, if capable this k pixel data of other n-m all belongs to white picture data, this data control circuit 124 is controlled this reversal of poles control circuit and is exported this first reversal of poles control signal.
Below in conjunction with Fig. 1 and Fig. 4, take a two field picture as example, the principle of work of liquid crystal indicator preferred embodiment of the present invention is introduced.
One Low Voltage Differential Signal connector (not shown) provides a frame image data to this sequential control circuit 110, and further, this frame image data is provided to buffer 121 and this time-sequence control module 130 of 120 of this data analysis moulds.Wherein, this frame image data comprises multirow pixel data.
It is other to random number that should multirow pixel data that this tandom number generator 122 produces polycomponents, every group of corresponding one-row pixels data of random number wherein, and comprise a plurality of addressing address.Particularly, this tandom number generator 122 produces every group of random number at twice, and the quantity of supposing every group of random number is 200, and this tandom number generator 122 first produces 100 random numbers, then produces other 100 random numbers.
This many groups random number is sequentially provided to this data control circuit 124, and this data control circuit 124 reads corresponding pixel data according to a plurality of addressing address of this many groups random number from this buffer 121, and the pixel data reading is analyzed.Particularly, this data control circuit 124 is according to a plurality of addressing address of every group of random number, in one-row pixels data corresponding to this group random number, read a plurality of pixel datas of corresponding the plurality of addressing address, when the quantity of this group random number is 200, this data control circuit 124 reads 200 pixel datas in corresponding one-row pixels data from this buffer 121.This data control circuit 124 is analyzed by the pixel data reading from every a line pixel data (as: these 200 pixel datas), judge that this row pixel 165 is that black picture data is capable, or white picture data is capable, to judge in this frame image data, whether meet " in the capable pixel 165 of n showing continuously, the capable pixel 165 of m showing continuously shows black picture, n≤4, n > m≤2, and in the capable pixel of other n-m, have at least the pixel 165 that two row show continuously to show white picture " situation, if result is yes, this data control circuit 124 is controlled this reversal of poles control circuit 125 these the first reversal of poles control signals of output, if the result is negative, this data control circuit 124 is controlled this reversal of poles control circuit 125 these the second reversal of poles control signals of output.
Further, this data control circuit 124 also can be set value and the condition of n and m, as set: this n=10, m=5, and the capable pixel 165 of other n-m be continuously the pixel column of demonstration, the situation that 5 row are black, 5 row are white; Or n=8, m=4, and the capable pixel 165 of other n-m is the pixel column showing continuously, the situation that 4 row are black, 4 row are white; Or n=3, m=3, and the capable pixel of other n-m is the pixel column showing continuously, the situation that 3 row are black, 3 row are white.With n=8, m=4, and the condition that the capable pixel 165 of other n-m is the continuous pixel column showing is example, this data control circuit 124 also can be set: this frame image data comprises 8 row pixel datas of continuous demonstration, the pixel 165 that wherein 4 row show continuously shows black picture, and the pixel 165 that other 4 row show continuously shows white picture.And when a two field picture comprises the capable pixel of n that meets above-mentioned condition, this data control circuit 124 is controlled this reversal of poles control circuit 125 these the first reversal of poles control signals of output; Otherwise this data control circuit 124 is controlled this reversal of poles control circuit 125 these the second reversal of poles control signals of output.
On the other hand, this time-sequence control module 130 receives after this frame image data, this frame image data is carried out to data processing and produce clock signal and data-signal, and this clock signal is offered to scan drive circuit 150 and data drive circuit 140 for controlling work schedule, also further this data-signal is provided to this data drive circuit 140.
This scan drive circuit 150 receives this clock signal, and exports series of scanning signals to the multi-strip scanning line 161 of this display panels 160.
This data drive circuit 140 receives this first or second reversal of poles control signal and data-signal, it is converted to a plurality of gray scale voltages according to this first or second reversal of poles control signal by this data-signal, and under the control of this clock signal, by the plurality of gray scale voltage, sequentially provide bar data line 163 at the most.
When this data drive circuit 140 receive be this first polarity control signal time, when a plurality of pixels 165 of this display panels 160 show this two field picture, in the capable pixel 165 of m of the corresponding black picture of described continuous demonstration, the polarity of pixel 165 that is positioned at same row is identical.Preferably, a plurality of pixels 165 of this display panels 160 show this two field picture in the mode of row reversion.
When this data drive circuit 140 receive be this second polarity control signal time, a plurality of pixels 165 of this display panels 160 add two lines reversions, single line reversion or two-wire inversion mode with a reversion, a line and show this two field picture.Preferably, the mode that a plurality of pixels of this display panels 160 add two line reversions with a line shows this two field picture.
Compared with prior art, in liquid crystal indicator 100 of the present invention, by this data analysis module 120, the view data of each frame is analyzed, in the capable pixel 165 of n of the continuous demonstration of a frame image data, when the capable pixel 165 of m showing continuously shows black picture, n≤4 wherein, n > m≤2, m and n are natural number, and these data analysis module 120 these first reversal of poles of output control signal to this data drive circuit 140.This data drive circuit 140 is processed and is produced a plurality of gray scale voltages and provide to this display panels 160 this data-signal according to this first reversal of poles control signal, while making a plurality of pixels 165 this two field picture of demonstration of this display panels 160, this is continuously in capable pixel 165 of m that show and that show black picture, and the polarity of all pixels 165 that is positioned at same row is identical.Thus, this that is positioned at same row shows that the capable pixel 165 of m of black picture does not exist polarity to switch, therefore when the capable pixel 165 of this m shows, change in voltage on this column data line 163 is less, and then the less difficult generation of the charging and discharging currents instantaneous variation of the ceramic condenser on printed circuit board (PCB) expands and shrink, thereby the phenomenon that corresponding printed circuit board (PCB) produces audible noise is enhanced.
Further, this data analysis module 120 adopts the pixel 165 of 122 pairs of every a line of this tandom number generator optionally to analyze, can save accordingly time and the step of some data processings, make the structure of this data analysis module 120 relatively simple, cost is lower.
Refer to Fig. 6, it is the circuit block diagram of data analysis module second embodiment of the liquid crystal indicator 100 shown in Fig. 1 of the present invention.The key distinction of the data analysis module 120 of this data analysis module 220 and the first embodiment is: its decision circuitry 223 comprises a data comparator 226, a counter 227 and a data control circuit 228.This data comparator 226 receives each frame image data of storage in this buffer 221, and each data analysis to each frame image data, to determine whether every a line pixel data belongs to the black picture data of a line.This counter 227 records the analysis result of this data comparator, and analysis result is provided to this data control circuit 228.This data control circuit 228 is according to this analysis result judgement, during the situation of " in the capable pixel of n of the continuous demonstration of a frame image data; when the capable pixel of m showing continuously shows black picture; n≤4 wherein; n > m≤2 ", this data control circuit 228 is controlled this reversal of poles control circuit 225 these the first reversal of poles control signals of output when existing; Otherwise this data control circuit 228 is controlled this reversal of poles control circuit 225 these the second reversal of poles control signals of output output.
Particularly, when this data comparator 226 is analyzed one-row pixels data, if one-row pixels data have seven ten at least percent data to belong to black picture data, these data comparator 226 these row pixels of judgement belong to the pixel that shows black picture.
Compare with the first embodiment, adopt the liquid crystal indicator of above-mentioned data analysis module 220, because this data analysis module 220 is analyzed each pixel data, and then the analysis result of this data analysis module 220 is relatively more accurate, and fiduciary level is higher.
In addition, in a kind of change design of this second embodiment, this data comparator 226 can further be analyzed every a line view data and whether belong to the white picture data of a line, particularly, data line in this frame image data has seven ten at least percent data to belong to white picture data, and this row pixel belongs to the pixel that shows white picture.And, in the capable pixel of n of the continuous demonstration of a frame image data, the capable pixel of m showing continuously shows black picture, the pixel that has at least two row to show continuously in the capable pixel of other n-m shows white picture, this data control circuit 228 is controlled this reversal of poles control circuit 225 these the first reversal of poles control signals of output output, otherwise this data control circuit 228 is controlled this reversal of poles control circuit 225 these the second reversal of poles control signals of output output.
The present invention also provides a kind of driving method of liquid crystal indicator of the audible noise that can improve, and refers to Fig. 7, and it is the process flow diagram of the driving method of liquid crystal indicator shown in Fig. 1 100.This driving method comprises the steps:
One, receive view data;
Particularly, in this step, this view data Yi Zhengwei unit, can receive the frame image data that a Low Voltage Differential Signal connector is exported;
Two, analyze this view data, in the capable pixel of arbitrary continuation n of the two field picture that this liquid crystal indicator wish shows, there is the capable pixel of continuous m to show black picture, n≤4 wherein, m≤2 o'clock, when controlling the capable pixel that shows black picture of this continuous m and showing, the polarity that is positioned at same row pixel is not reversed.
Particularly, in this step, judge this frame image data, if in the capable pixel of arbitrary continuation n of the two field picture that this liquid crystal indicator wish shows, whether have the capable pixel of continuous m to show black picture, n≤4 wherein, m≤2, m and n are natural number;
When above-mentioned judgment result is that is, when controlling the capable pixel that shows black picture of this continuous m and showing, the polarity that is positioned at same row pixel is not reversed.
The determination result is NO when above-mentioned, controls the mode that this two field picture adds two lines reversions, single line reversion or two-wire reversion with a reversion, a line and show.
Further, in one embodiment, while analyzing this view data, only have in the capable pixel of n of the continuous demonstration of working as a frame image data, the capable pixel of m showing continuously shows when black picture and the capable pixel of other n-m show white picture, when just controlling the capable pixel that shows black picture of this continuous m and showing, the polarity that is positioned at same row pixel is not reversed.
In a kind of change embodiment, while analyzing this view data, only have in the capable pixel of n of the continuous demonstration of working as a frame image data, the capable pixel of m showing continuously shows black picture, the pixel that has at least two row to show continuously in the capable pixel of other n-m shows white picture, when just controlling the capable pixel that shows black picture of this continuous m and showing, the polarity that is positioned at same row pixel is not reversed.
Particularly, the situation of aforesaid " when controlling the capable pixel that shows black picture of this continuous m and showing; the polarity that is positioned at same row pixel is not reversed " comprises to be controlled while making a plurality of pixels of this liquid crystal indicator show this two field picture, the polarity of all pixels that is positioned at same row is identical, as: a plurality of pixels that make this display panels show this two field picture in the mode of row reversion or frame reversion.
Claims (24)
1. a liquid crystal indicator, it comprises a sequential control circuit, scan driving circuit, one data drive circuit and a display panels, this display panels comprises a plurality of pixels, this sequential control circuit comprises a time-sequence control module, this time-sequence control module receives each frame image data, and produce clock signal and data-signal according to this view data, and export this clock signal to this data drive circuit and scan drive circuit to control work schedule, and export data-signal to this data drive circuit, this data drive circuit and scan drive circuit are for driving a plurality of pixels of this display panels to show image, it is characterized in that: this sequential control circuit also comprises a data analysis module, this data analysis module is for receiving and analyze each frame image data, in the capable pixel of n of the continuous demonstration of a frame image data, when the capable pixel of m showing continuously shows black picture, n≤4 wherein, n > m≤2, m and n are natural number, this data analysis module output one first reversal of poles controls signal to this data drive circuit, this data drive circuit is processed and is produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, while making a plurality of pixels of this display panels show this two field picture, in this continuous capable pixel of m that show and that show black picture, the polarity of all pixels that is positioned at same row is identical.
2. liquid crystal indicator as claimed in claim 1, it is characterized in that: this data drive circuit is processed and produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, while making a plurality of pixels of this display panels show this two field picture, the polarity of all pixels that is positioned at same row is identical.
3. liquid crystal indicator as claimed in claim 2, it is characterized in that: this data drive circuit is processed and produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, make a plurality of pixels of this display panels show this two field picture in the mode that row reverse or frame reverses.
4. liquid crystal indicator as claimed in claim 1, it is characterized in that: this data analysis module comprises a buffer, a decision circuitry and a reversal of poles control circuit, this buffer is for sequentially receiving and keep in this each frame image data, this decision circuitry is for reading each frame image data that this buffer is stored, and this each frame image data is analyzed, in the capable pixel of n of the continuous demonstration of a frame image data, when the capable pixel of m showing continuously shows black picture, it is controlled this reversal of poles control circuit and exports this first reversal of poles control signal.
5. liquid crystal indicator as claimed in claim 4, it is characterized in that: this decision circuitry comprises a tandom number generator, one data control circuit, this tandom number generator sequentially produces many group random numbers and provides this many groups random number to this data control circuit, every group of random number comprises k addressing address, the data of k pixel in this k the corresponding one-row pixels of addressing address difference, this data control circuit reads the data of k pixel in one-row pixels in the frame image data from this buffer according to this k addressing address, and analyze each data of this k pixel, capable to judge whether this row pixel belongs to black picture pixel, this data control circuit further capable to described black picture pixel and total number of lines of pixels is counted, when there being above-mentioned n≤4, during the situation of n > m≤2, this data control circuit is controlled this reversal of poles control circuit and is exported this first reversal of poles control signal.
6. liquid crystal indicator as claimed in claim 5, it is characterized in that: when this data control circuit is analyzed each data of this k pixel, if the data of this k pixel all belong to black picture data, this data control circuit judges that this row pixel belongs to the pixel that shows black picture.
7. liquid crystal indicator as claimed in claim 6, it is characterized in that: it is capable that this data control circuit also judges whether this row pixel belongs to white picture pixel while analyzing each data of this k pixel, in the capable pixel of n of the continuous demonstration of a frame image data, the capable pixel of m showing continuously shows black picture, the pixel that has at least two row to show continuously in the capable pixel of other n-m shows white picture, and this data control circuit is controlled this reversal of poles control circuit and exported this first reversal of poles control signal.
8. liquid crystal indicator as claimed in claim 7, it is characterized in that: when this data control circuit is analyzed each data of this k pixel, if the data of this k pixel all belong to white picture data, this data control circuit judges that this row pixel belongs to the pixel that shows white picture.
9. liquid crystal indicator as claimed in claim 4, it is characterized in that: this decision circuitry comprises a data comparator, one counter and a data control circuit, this data comparator receives each frame image data of storing in this buffer, and each data analysis to each frame image data, data line in this frame image data has seven ten at least percent data to belong to black picture data, this data comparator judges that this row pixel belongs to the pixel that shows black picture, this counter is for recording the analysis result of this data comparator, and analysis result is provided to this data control circuit, this data control circuit judges that according to this analysis result this n and m meet n≤4, during the situation of n > m≤2, this data control circuit is controlled this reversal of poles control circuit and is exported this first reversal of poles control signal.
10. liquid crystal indicator as claimed in claim 9, it is characterized in that: this data comparator is further analyzed each data of each frame image data, data line in this frame image data has seven ten at least percent data to belong to white picture data, this row pixel belongs to the pixel that shows white picture, in the capable pixel of n of the continuous demonstration of a frame image data, the capable pixel of m showing continuously shows black picture, the pixel that has at least two row to show continuously in the capable pixel of other n-m shows white picture, this data control circuit is controlled this reversal of poles control circuit and is exported this first reversal of poles control signal.
11. liquid crystal indicators as described in claim 8 or 10, is characterized in that: this black picture data be GTG lower than the data of one first predetermined GTG, this white picture data is that GTG is higher than the data of one second predetermined GTG.
12. liquid crystal indicators as claimed in claim 11, is characterized in that: this first predetermined GTG is 32, and this second predetermined GTG is 200.
13. liquid crystal indicators as claimed in claim 1, it is characterized in that: when this data analysis module is analyzed a frame image data, when this frame image data does not meet above-mentioned " in the capable pixel of n showing continuously, the capable pixel of m showing continuously shows black picture, n≤4 wherein, n > m≤2 " situation time, this data analysis module output one second reversal of poles controls signal to this data drive circuit, this data drive circuit is processed and is produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this second reversal of poles control signal, make a plurality of pixels of this display panels with a reversion, one line adds two line reversions, single line reversion or two-wire reversion show this two field picture.
14. 1 kinds of liquid crystal indicators, it comprises a sequential control circuit, scan driving circuit, one data drive circuit and a display panels, this display panels comprises a plurality of pixels, this sequential control circuit comprises a time-sequence control module, this time-sequence control module receives each frame image data, and produce clock signal and data-signal according to this view data, and export this clock signal to this data drive circuit and scan drive circuit to control work schedule, and export data-signal to this data drive circuit, this data drive circuit and scan drive circuit are for driving a plurality of pixels of this display panels to show image, it is characterized in that: this sequential control circuit also comprises a data analysis module, this data analysis module is for receiving and analyze each frame image data, in the capable pixel of n of the continuous demonstration of a frame image data, the capable pixel of m showing continuously shows when black picture and the capable pixel of other n-m show white picture, n≤4 wherein, n > m≤2, m and n are natural number, this data analysis module output one first reversal of poles controls signal to this data drive circuit, this data drive circuit is processed and is produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, while making a plurality of pixels of this display panels show this two field picture, in this continuous capable pixel of m that show and that show black picture, the polarity of all pixels that is positioned at same row is identical.
15. 1 kinds of liquid crystal indicators, it comprises a sequential control circuit, scan driving circuit, one data drive circuit and a display panels, this display panels comprises a plurality of pixels, this sequential control circuit comprises a time-sequence control module, this time-sequence control module receives each frame image data, and produce clock signal and data-signal according to this view data, and export this clock signal to this data drive circuit and scan drive circuit to control work schedule, and export data-signal to this data drive circuit, this data drive circuit and scan drive circuit are for driving a plurality of pixels of this display panels to show image, it is characterized in that: this sequential control circuit also comprises a data analysis module, this data analysis module is for receiving and analyze each frame image data, in the capable pixel of n of the continuous demonstration of a frame image data, the capable pixel of m showing continuously shows when the pixel that has at least two row to show continuously in black picture and the capable pixel of other n-m shows white picture, n≤4 wherein, n > m≤2, m and n are natural number, this data analysis module output one first reversal of poles controls signal to this data drive circuit, this data drive circuit is processed and is produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, while making a plurality of pixels of this display panels show this two field picture, in this continuous capable pixel of m that show and that show black picture, the polarity of all pixels that is positioned at same row is identical.
16. 1 kinds of liquid crystal indicators, it comprises a sequential control circuit, scan driving circuit, one data drive circuit and a display panels, this display panels comprises a plurality of pixels, this sequential control circuit comprises a time-sequence control module, this time-sequence control module receives each frame image data, and produce clock signal and data-signal according to this view data, and export this clock signal to this data drive circuit and scan drive circuit to control work schedule, and export data-signal to this data drive circuit, this data drive circuit and scan drive circuit are for driving a plurality of pixels of this display panels to show image, it is characterized in that: this sequential control circuit also comprises a data analysis module, this data analysis module is for receiving and analyze each frame image data, in the capable pixel of n of the continuous demonstration of a frame image data, when the capable pixel of m showing continuously shows black picture, and the pixel that has at least two row to show continuously in the capable pixel of other n-m shows white picture, n≤4 wherein, n > m≤2, m and n are natural number, this data analysis module output one first reversal of poles controls signal to this data drive circuit, this data drive circuit is processed and is produced a plurality of gray scale voltages and provide to this display panels this data-signal according to this first reversal of poles control signal, make a plurality of pixels of this display panels show this two field picture to be listed as the mode of reversion.
The driving method of 17. 1 kinds of liquid crystal indicators, this driving method comprises the steps:
A. receive view data;
B. analyze this view data, in the capable pixel of arbitrary continuation n of the two field picture that this liquid crystal indicator wish shows, there is the capable pixel of continuous m to show black picture, n≤4 wherein, m≤2, when m and n are natural number, when controlling the capable pixel that shows black picture of this continuous m and showing, the polarity that is positioned at same row pixel is not reversed, so that the polarity between same row pixel is all identical.
The driving method of 18. liquid crystal indicators as claimed in claim 17, is characterized in that: in this step a, this view data Yi Zhengwei unit, receives the frame image data that a Low Voltage Differential Signal connector is exported.
The driving method of 19. liquid crystal indicators as claimed in claim 17, it is characterized in that: in this step b, analyze in the capable pixel of arbitrary continuation n that this view data comprises the two field picture that this liquid crystal indicator wish of judgement shows, whether have the capable pixel of continuous m to show the step of black picture.
The driving method of 20. liquid crystal indicators as claimed in claim 19, it is characterized in that: when judgment result is that, be, when controlling the capable pixel that shows black picture of this continuous m and showing, the polarity that is positioned at same row pixel is not reversed, so that the polarity between same row pixel is all identical; When the determination result is NO, control this two field picture and add the mode that two lines reverse, single line reverses or two-wire reverses and show with a reversion, a line.
The driving method of 21. liquid crystal indicators as claimed in claim 19, is characterized in that: when judgment result is that, be that, when a plurality of pixels of controlling this display panels show this two field picture, the polarity of all pixels that is positioned at same row is identical; When the determination result is NO, control this two field picture and add the mode that two lines reverse, single line reverses or two-wire reverses and show with a reversion, a line.
The driving method of 22. liquid crystal indicators as claimed in claim 19, is characterized in that: when judgment result is that, be to control this display panels and show this two field picture in the mode that row reverse or frame reverses; When the determination result is NO, control the mode that this two field picture adds two lines reversions, single line reversion or two-wire reversion with a reversion, a line and show this two field picture.
The driving method of 23. liquid crystal indicators as claimed in claim 17, it is characterized in that: while analyzing this view data, in the capable pixel of n of the continuous demonstration of a frame image data, the capable pixel of m showing continuously shows when black picture and the capable pixel of other n-m show white picture, when just controlling the capable pixel that shows black picture of this continuous m and showing, the polarity that is positioned at same row pixel is not reversed, so that the polarity between same row pixel is all identical.
The driving method of 24. liquid crystal indicators as claimed in claim 17, it is characterized in that: while analyzing this view data, in the capable pixel of n of the continuous demonstration of a frame image data, the capable pixel of m showing continuously shows black picture, the pixel that has at least two row to show continuously in the capable pixel of other n-m shows white picture, when just controlling the capable pixel that shows black picture of this continuous m and showing, the polarity that is positioned at same row pixel is not reversed, so that the polarity between same row pixel is all identical.
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| TWI464732B (en) * | 2012-06-22 | 2014-12-11 | Benq Corp | Monitor and method of displaying pixels on displaying device |
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| CN104766588B (en) * | 2015-05-08 | 2017-07-28 | 京东方科技集团股份有限公司 | A kind of driving method of display panel, display device |
| CN105448223B (en) * | 2015-12-30 | 2018-06-12 | 荆溪瑞 | A kind of display control circuit and display device |
| CN105654917B (en) * | 2016-04-08 | 2018-03-30 | 京东方科技集团股份有限公司 | Polarity reversal driving method, data driver and liquid crystal panel |
| JP6957903B2 (en) * | 2017-03-08 | 2021-11-02 | セイコーエプソン株式会社 | Display devices and electronic devices |
| CN109859715B (en) * | 2019-04-08 | 2021-02-02 | 惠科股份有限公司 | Display driving method and liquid crystal display device |
| CN111326120B (en) * | 2020-04-08 | 2021-08-24 | Tcl华星光电技术有限公司 | Local backlight dimming circuit and dimming method and liquid crystal display device |
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