CN106154668B - Pixel driving system, liquid crystal display and pixel driving method - Google Patents
Pixel driving system, liquid crystal display and pixel driving method Download PDFInfo
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- CN106154668B CN106154668B CN201610821979.8A CN201610821979A CN106154668B CN 106154668 B CN106154668 B CN 106154668B CN 201610821979 A CN201610821979 A CN 201610821979A CN 106154668 B CN106154668 B CN 106154668B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136227—Through-hole connection of the pixel electrode to the active element through an insulation layer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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Abstract
The invention discloses a pixel driving system, which comprises a plurality of first pixel electrode groups and a plurality of second pixel electrode groups, wherein the first pixel electrode groups and the second pixel electrode groups are sequentially and alternately arranged along the same direction, each first pixel electrode group comprises even number of first data lines, each first data line is connected between one row of pixel electrodes and a data driving circuit, each second pixel electrode group comprises even number of second data lines, each second data line is connected between one row of pixel electrodes and the data driving circuit, and in the same frame, the data driving circuit applies bias voltages with opposite polarities to the pixel electrodes of the first pixel electrode groups and the pixel electrodes of the second pixel electrode groups. The bias voltage applied to the pixel electrode does not influence the common voltage, the voltage difference between the pixel voltage displayed in the dark state and the common voltage is stable and unchanged, the pixel electrode displayed in the dark state normally displays the dark state effect, and the phenomenon that the picture of the display is whitened is avoided.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel driving system, a liquid crystal display and a pixel driving method.
Background
Thin Film Transistor liquid crystal displays (TFT-LCDs) have been developed rapidly and widely used in recent years, and are widely used in display devices of portable mobile electronic products, such as mobile phones, digital cameras, palm computers, GPRS and other mobile products. A liquid crystal display panel is generally formed by aligning a color film substrate and an array substrate, and a liquid crystal layer is enclosed in a space between the two substrates. The array substrate mainly comprises scanning lines, data lines and pixel electrodes, the scanning lines are perpendicular to the arrangement direction of the data lines, the pixel electrodes are formed in pixel areas formed by the scanning lines and the data lines in a staggered mode, thin film transistors are conducted through scanning line signals, signals sent by the data lines are sent to the corresponding pixel electrodes through the thin film transistors, bias voltage of the pixel electrodes is changed, and accordingly liquid crystal molecules are controlled to deflect. If the liquid crystal molecules are fixed at a certain bias voltage for a long time and do not change, even if the bias voltage is cancelled, the liquid crystal molecules cannot rotate due to the change of an electric field to form different gray scales, and the characteristics of the liquid crystal molecules are prevented from being damaged by reversing the polarity of the bias voltage at intervals in an actual product. Under special display modes such as a dot switch and the like, the display states of the pixel electrodes are divided into a bright state and a dark state, the pixel electrodes for bright state display and the pixel electrodes for dark state display are arranged in a staggered mode, and data driving realizes bright state display and dark state display by applying bias voltages with different magnitudes to the pixel electrodes.
In the prior art, the polarity inversion method is mainly a column inversion method, and the pixel electrodes of each column are connected through a data line and are commonly electrically connected to a data driving circuit. The two adjacent columns of pixel drive have opposite polarity bias voltage in the same frame picture, although overcome the problem of cross talk and display panel flicker, under the control of scanning drive to the on-off state of the thin film transistor, the data drive circuit applies the bias voltage to the pixel electrode of each row in turn. The bias voltages applied to the pixel electrodes of two adjacent columns and one row are the same in change rule, that is, along the column direction, the bias voltages of the pixel electrodes of the adjacent columns are simultaneously increased or simultaneously decreased, the common voltage of the common electrode is affected by the bias voltages of the pixel electrodes to be increased or decreased, and the pixel voltage displayed in a dark state is unchanged, so that the voltage difference between the pixel voltage displayed in the dark state and the common voltage is increased, the larger the voltage difference between the pixel voltage displayed in the dark state and the common voltage is, the brighter the pixel electrode displayed in the dark state is, and the problem that a picture of a display is whitened occurs.
Disclosure of Invention
The invention provides a pixel driving system, a liquid crystal display and a pixel driving method, which are used for solving the problems that in the prior art, under special display modes such as a dot switch and the like, the voltage difference between a bias voltage and a common voltage of dark state display becomes large, so that the display of a pixel electrode of the dark state display is bright and the display has a white picture.
To solve the above technical problems, in one aspect, the present invention provides a pixel driving system, comprising a data driving circuit and a pixel electrode array electrically connected to each other, the pixel electrode array comprises a plurality of first pixel electrode groups and a plurality of second pixel electrode groups which are sequentially and alternately arranged along the same direction, the first pixel electrode group includes an even number of first data lines each connected between a row of the pixel electrodes and the data driving circuit, the second pixel electrode group comprises an even number of second data lines, each second data line is connected between one row of the pixel electrodes and the data driving circuit, in the same frame, the data driving circuit applies bias voltages of opposite polarities to the pixel electrodes of the first pixel electrode group and the pixel electrodes of the second pixel electrode group.
Further, the pixel electrodes include first luminance electrodes and second luminance electrodes, the first luminance electrodes and the second luminance electrodes in each row are sequentially and alternately arranged, and an absolute value of a difference between a bias voltage of the first luminance electrodes and a common voltage is larger than an absolute value of a difference between a bias voltage of the second luminance electrodes and the common voltage, so that the first luminance electrodes display a bright state, and the second luminance electrodes display a dark state.
Further, the data driving circuit comprises a first output driver and a second output driver, the polarity of the bias voltage output by the first output driver is opposite to that of the bias voltage output by the second output driver, the first output driver is electrically connected with the first pixel electrode group through the first data line, and the second output driver is electrically connected with the second pixel electrode group through the second data line.
Furthermore, the pixel driving system further comprises a scanning driving circuit and scanning lines, wherein the scanning driving circuit is electrically connected with the pixel electrodes through the scanning lines and controls the on-off state among the first data line, the second data line and the pixel electrodes.
In another aspect, the present invention further provides a liquid crystal display, which includes a common electrode, a liquid crystal layer and the pixel driving system, wherein the liquid crystal layer is located between the common electrode and the pixel electrode and controls liquid crystal deflection through the data driving circuit so as to change image output.
In another aspect, the present invention further provides a pixel driving method, including:
there is provided a pixel driving system comprising a first set of output drivers and a first set of pixel electrodes, a second set of output drivers and a second set of pixel electrodes electrically connected to each other,
the system mainboard sends a digital signal containing image information to the time sequence control circuit;
the time sequence control circuit processes the digital signal and then sends a polarity inversion signal to the data driving circuit;
the first output driver of the data driving circuit applies a bias voltage to each pixel electrode of the first pixel electrode group, and the second output driver applies a bias voltage having a polarity opposite to that of the first output driver output to each pixel electrode of the second pixel electrode group.
Further, the "the first output driving of the data driving circuit applies a bias voltage to each pixel electrode of the first pixel electrode group, and the second output driving applies a bias voltage having a polarity opposite to that of the first output driving output to each pixel electrode of the second pixel electrode group" includes: the first output drive applies the bias voltages of opposite polarities to the first pixel electrode group in odd and even frames, and the second output drive applies the bias voltages of opposite polarities to the second pixel electrode group in odd and even frames.
Further, the "the first output driving of the data driving circuit applies a bias voltage to each pixel electrode of the first pixel electrode group, and the second output driving applies a bias voltage having a polarity opposite to that of the first output driving output to each pixel electrode of the second pixel electrode group" includes: the first output driver and the second output driver may both output a bright-state voltage and a dark-state voltage, an absolute value of a difference between the bright-state voltage and a common voltage is larger than an absolute value of a difference between the dark-state voltage and the common voltage, the first output driver sequentially outputs the bright-state voltage and the dark-state voltage to each of the pixel electrodes of the first pixel electrode group, and the second output driver sequentially outputs the bright-state voltage and the dark-state voltage to each of the pixel electrodes of the second pixel electrode group.
Further, an absolute value of a difference between the bright-state voltage and the common voltage is larger than an absolute value of a difference between the dark-state voltage and the common voltage.
Further, the step of sending a polarity inversion signal to the data driving circuit after the digital signal is processed by the timing control circuit includes that the timing control circuit also sends a clock signal to the scanning driving circuit, and the scanning driving circuit individually controls the on-off state of each pixel electrode and the data driving circuit according to the clock signal.
The invention has the following beneficial effects: the polarity of the bias voltage applied to each pixel electrode in each row in the first pixel electrode group is the same, and the polarity of the bias voltage applied to each pixel electrode in each row in the second pixel electrode group is the same, so that the problem of cross talk when the pixel electrodes are inverted is solved; the first pixel electrode group and the second pixel electrode group are sequentially and alternately arranged, and the polarity of bias voltage applied to each pixel electrode of the first pixel electrode group is opposite to that of the bias voltage applied to each pixel electrode of the second pixel electrode group, so that the problem of flicker of the display panel is solved. The bias voltage conversion trends of the two adjacent rows of pixel electrodes in the first pixel electrode group are opposite and mutually offset, the bias voltage conversion trends of the two adjacent rows of pixel electrodes in the second pixel electrode group are opposite and mutually offset, the bias voltage applied to the pixel electrodes does not influence the common voltage, the voltage difference between the pixel voltage displayed in the dark state and the common voltage is stable and unchanged, the pixel electrode displayed in the dark state normally displays the dark state effect, and the phenomenon that the picture of the display is whitened is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other obvious modifications can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a pixel driving system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a variation of a bias voltage in a pixel driving method according to an embodiment of the invention.
Fig. 3 is a flowchart of a pixel driving method according to an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a pixel driving system according to a second embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a pixel driving system according to a third embodiment of the present invention.
Fig. 6 is a schematic diagram of a liquid crystal display according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a pixel driving system according to an embodiment of the present invention, as shown in the figure, the pixel driving system includes a data driving circuit 20 and a pixel electrode 10 array electrically connected to each other, taking an 8 × 4 pixel electrode 10 array as an example, the pixel electrode 10 array includes two first pixel electrode groups 12 and two second pixel electrode groups 14 alternately arranged in sequence, the first pixel electrode group 12 includes two first data lines 122, each of the first data lines 122 connects one column of pixel electrodes 10 to form a first pixel electrode sub-group 120, that is, one first pixel electrode group 12 includes two first pixel electrode sub-groups 120; the second pixel electrode group 14 includes two second data lines 142, and each second data line 142 connects a column of pixel electrodes 10 to form a second pixel electrode subgroup 140, i.e. one second pixel electrode group 14 includes two second pixel electrode subgroups 140. In the same frame, the polarities of the bias voltages applied to the pixel electrodes 10 of the first pixel electrode subgroup 120 and the pixel electrodes 10 of the second pixel electrode subgroup 140 are opposite. Specifically, in the present embodiment, the four first data lines 122 are respectively connected to the first row of pixel electrodes 10, the second row of pixel electrodes 10, the fifth row of pixel electrodes 10 and the sixth row of pixel electrodes 10 to form four first pixel electrode sub-groups 120, wherein the first row of pixel electrodes 10 and the second row of pixel electrodes 10 form a first pixel electrode group 12, and the fifth row of pixel electrodes 10 and the sixth row of pixel electrodes 10 form a first pixel electrode group 12; the four second data lines 142 are respectively connected to the third row of pixel electrodes 10, the fourth row of pixel electrodes 10, the seventh row of pixel electrodes 10 and the eighth row of pixel electrodes 10 to form four second pixel electrode sub-groups 140, wherein the third row of pixel electrodes 10 and the fourth row of pixel electrodes 10 form a second pixel electrode group 14, and the seventh row of pixel electrodes 10 and the eighth row of pixel electrodes 10 form a first pixel electrode group 12.
If the polarities of the adjacent pixel electrodes 10 are opposite, and the display brightness of the display panel under the bias voltages of the positive polarity and the negative polarity is different, when the positive polarity and the negative polarity of the pixel electrodes 10 are switched, the display panel can generate an obvious flicker phenomenon; if the polarities of the adjacent pixel electrodes 10 are the same, cross talk occurs between the pixel electrodes 10 with different polarities during the inversion process. In this embodiment, the polarities of the bias voltages applied to the pixel electrodes 10 in the first pixel electrode group 12 are the same, and the polarities of the bias voltages applied to the pixel electrodes 10 in the second pixel electrode group 14 are the same, so that the problem of cross talk when the pixel electrodes 10 are inverted is solved; the first pixel electrode group 12 and the second pixel electrode group 14 are alternately arranged in sequence, and the polarity of the bias voltage applied to each pixel electrode 10 of the first pixel electrode group 12 is opposite to that of each pixel electrode 10 of the second pixel electrode group 14, so that the problem of flicker of the display panel is solved.
In this embodiment, the pixel electrode 10 includes a first luminance electrode 102 and a second luminance electrode 104, the first luminance electrode 102 and the second luminance electrode 104 in the column direction are sequentially and alternately arranged, and the first luminance electrode 102 and the second luminance electrode 104 in the row direction are sequentially and alternately arranged. Specifically, the pixel electrodes 10 adjacent to each other in the row direction and the column direction of each first luminance electrode 102 are the second luminance electrodes 104, and the pixel electrodes 10 adjacent to each other in the row direction and the column direction of each second luminance electrode 104 are the first luminance electrodes 102. Further, the absolute value of the difference between the bias voltage of the first luminance electrode 102 and the common voltage is larger than the absolute value of the difference between the bias voltage of the second luminance electrode 104 and the common voltage. In one embodiment, the absolute value of the difference between the bias voltage of the first luminance electrode 102 and the common voltage is greater than the absolute value of the difference between the bias voltage of the second luminance electrode 104 and the common voltage by 6V, but in other embodiments, the difference may be greater or smaller.
Further, referring to fig. 2, in the first frame, the driving circuit outputs a positive voltage to the first pixel electrode group 12, that is, the bias voltages of the first luminance electrode 102 and the second luminance electrode 104 in the first pixel electrode group 12 are both higher than the common voltage, where the bias voltage of the first luminance electrode 102 is a bright-state voltage, the bias voltage of the second luminance electrode 104 is a dark-state voltage, and a voltage difference between the bright-state voltage and the common voltage is 6V greater than a voltage difference between the dark-state voltage and the common voltage. Taking the first row of pixel electrodes 10 and the second row of pixel electrodes 10 as an example, when the data driving circuit 20 sequentially outputs the bias voltage to the pixel electrodes 10 of each row of the first row along the row direction, the bias voltage is sequentially switched between the bright state voltage and the dark state voltage from the bright state voltage, and when the data driving circuit 20 sequentially outputs the bias voltage to the pixel electrodes 10 of each row of the first row, the bias voltage is sequentially switched between the bright state voltage and the dark state voltage from the dark state voltage, the bright state voltage and the dark state voltage are respectively applied to the two pixel electrodes 10 of the same row of the first row and the second row, that is, the change rules of the bias voltages of the first row and the second row are opposite, the opposite bias voltage change trends are mutually cancelled, the common voltage is not coupled and influenced, the magnitude of the common voltage is changed, and the difference value of the dark state voltage in the common voltage is stable and unchanged, the second brightness electrode 104 performs normal dark state display, thereby avoiding the occurrence of the phenomenon of white display.
Meanwhile, in the first frame, the driving circuit outputs a negative voltage to the second pixel electrode group 14, that is, the bias voltages of the first luminance electrode 102 and the second luminance electrode 104 in the second pixel electrode group 14 are both lower than the common voltage, where the bias voltage of the first luminance electrode 102 is a bright-state voltage, the bias voltage of the second luminance electrode 104 is a dark-state voltage, and the voltage difference between the bright-state voltage and the common voltage is greater than the voltage difference between the dark-state voltage and the common voltage by 6V. Taking the third row of pixel electrodes 10 and the fourth row of pixel electrodes 10 as an example, when the data driving circuit 20 sequentially outputs the bias voltage to the pixel electrodes 10 of each row of the third row along the row direction, the bias voltage is sequentially switched between the bright state voltage and the dark state voltage from the bright state voltage, and when the data driving circuit 20 sequentially outputs the bias voltage to the pixel electrodes 10 of each row of the fourth row, the bias voltage is sequentially switched between the bright state voltage and the dark state voltage from the dark state voltage, the bright state voltage and the dark state voltage are respectively applied to the two pixel electrodes 10 of the same row of the third row and the fourth row, that is, the change rules of the bias voltages of the third row and the fourth row are opposite, the opposite bias voltage change trends are mutually cancelled, the common voltage is not coupled and influenced, the magnitude of the common voltage is changed, and the difference value of the dark state voltage in the common voltage is stable and constant, the second brightness electrode 104 performs normal dark state display, thereby avoiding the occurrence of the phenomenon of white display.
The bias voltage conversion trends of the two first pixel electrode subgroups 120 in the first pixel electrode group 12 are opposite and mutually offset, the bias voltage conversion trends of the two second pixel electrode subgroups 140 in the second pixel electrode group 14 are also opposite and mutually offset, when the pixel electrodes 10 and the common electrode 30 work in a matching manner, the bias voltage applied to the pixel electrodes 10 cannot influence and change the common voltage, the voltage difference between the bias voltage for dark state display and the common voltage is stable and unchanged, the pixel electrodes 10 for dark state display normally display a dark state effect, and the phenomenon that the display is whitened is avoided.
In this embodiment, the data driving circuit 20 includes a first output driver 22 and a second output driver 24, in the same frame, the polarities of the bias voltages output by the first output driver 22 and the second output driver 24 are opposite, the first output driver 22 is electrically connected to the first pixel electrode subset 120 through the first data line 122, and the second output driver 24 is electrically connected to the second pixel electrode subset 140 through the second data line 142. Specifically, the first output driver 22 outputs a positive bias voltage and the second output driver 24 outputs a negative bias voltage in the first frame, and the first output driver 22 outputs a negative bias voltage and the second output driver 24 outputs a positive bias voltage in the next frame.
The polarity of the bias voltage applied to each pixel electrode 10 in the first pixel electrode group 12 by the first output driver 22 is the same, and the polarity of the bias voltage applied to each pixel electrode 10 in the second pixel electrode group 14 by the second output driver 24 is the same, so that the problem of cross talk when the pixel electrodes 10 are inverted is solved; the first pixel electrode group 12 and the second pixel electrode group 14 are alternately arranged in sequence, and the bias voltage output by the first output driver 22 is opposite to the bias voltage output by the second output driver 24, so that the problem of flicker of the display panel is solved.
In this embodiment, the pixel driving system further includes a scan driving circuit and scan lines, wherein the scan driving circuit is electrically connected to each pixel electrode 10 through the scan lines and controls the on/off states between the first data line 122, the second data line 142 and the pixel electrode 10. Further, the scanning lines connect the pixel electrodes 10 in each row to the scanning driving circuit, and the scanning driving circuit sequentially controls the on-off states of the pixel electrodes 10 and the first data lines 122 or the second data lines 142 in each row and in each row, specifically, only one row of the pixel electrodes 10 is kept connected with the first data lines 122 or the second data lines 142 at the same time in each scanning line. Each time the on-off state of a row of pixel electrodes 10 is switched, the data driving circuit 20 simultaneously switches the bright-state voltage and the dark-state voltage once, and different bias voltages are applied to two pixel electrodes 10 adjacent to each other in the column direction in respective connected states.
The scanning driving and scanning line controls each pixel electrode 10 to be sequentially communicated with the first data line 122 or the second data line 142, so that the first brightness electrode 102 sequentially receives the bright-state voltage and the second brightness electrode 104 sequentially receives the dark-state voltage, the first brightness electrode 102 and the second brightness electrode 104 alternately work, and each pixel electrode 10 works according to the work requirement.
Fig. 3 is a flowchart of a pixel driving method according to an embodiment of the present invention, where as shown in the figure, the pixel driving method includes the following steps:
1. the system mainboard sends a digital signal containing image information to the timing control circuit.
Specifically, the digital signal sent by the system main board contains image content information to be displayed, and the image content information enters the time sequence control circuit, is analyzed and processed by the plurality of processing modules and then is sent to different devices of the display device to finally realize the display of the image.
2. The timing control circuit processes the digital signal and transmits a polarity inversion signal to the data driving circuit 20.
Specifically, the timing control circuit further sends a clock signal to the scan driving circuit, and the scan driving circuit individually controls the on/off state of each pixel electrode 10 and the data driving circuit 20 according to the clock signal. The scanning driving and scanning line controls each pixel electrode 10 to be sequentially communicated with the first data line 122 or the second data line 142, so that the first brightness electrode 102 sequentially receives the bright-state voltage and the second brightness electrode 104 sequentially receives the dark-state voltage, the first brightness electrode 102 and the second brightness electrode 104 alternately work, and each pixel electrode 10 works according to the work requirement.
3. The first output driver 22 of the data driving circuit 20 applies a bias voltage to each pixel electrode 10 of the first pixel electrode sub-group 120, and the second output driver 24 applies a bias voltage having a polarity opposite to that output by the first output driver 22 to each pixel electrode 10 of the second pixel electrode sub-group 140.
Specifically, the first output driver 22 applies a bias voltage having an opposite polarity to the first pixel electrode sub-group 120 in odd and even frames, and the second output driver 24 applies a bias voltage having an opposite polarity to the second pixel electrode sub-group 140 in odd and even frames. The polarity of the bias voltage applied to each pixel electrode 10 in the first pixel electrode group 12 is the same, and the polarity of the bias voltage applied to each pixel electrode 10 in the second pixel electrode group 14 is the same, so that the problem of cross talk when the pixel electrodes 10 are inverted is solved; the first pixel electrode group 12 and the second pixel electrode group 14 are alternately arranged in sequence, and the polarity of the bias voltage applied to each pixel electrode 10 of the first pixel electrode group 12 is opposite to that of each pixel electrode 10 of the second pixel electrode group 14, so that the problem of flicker of the display panel is solved.
Further, the first output driver 22 and the second output driver 24 may both output a bright-state voltage and a dark-state voltage, an absolute value of a difference between the bright-state voltage and the common voltage is greater than an absolute value of a difference between the dark-state voltage and the common voltage, the first output driver 22 sequentially outputs the bright-state voltage and the dark-state voltage to each pixel electrode 10 of the first pixel electrode sub-group 120, and the second output driver 24 sequentially outputs the bright-state voltage and the dark-state voltage to each pixel electrode 10 of the second pixel electrode sub-group 140. The bias voltage conversion trends of the two first pixel electrode subgroups 120 in the first pixel electrode group 12 are opposite and mutually offset, the bias voltage conversion trends of the two second pixel electrode subgroups 140 in the second pixel electrode group 14 are also opposite and mutually offset, when the pixel electrodes 10 and the common electrode 30 work in a matching manner, the bias voltage applied to the pixel electrodes 10 cannot influence and change the common voltage, the voltage difference between the bias voltage for dark state display and the common voltage is stable and unchanged, the pixel electrodes 10 for dark state display normally display a dark state effect, and the phenomenon that the display is whitened is avoided.
Fig. 4 is a schematic structural diagram of a pixel driving system according to a second embodiment of the present invention, as shown in the drawing, the second embodiment differs from the first embodiment in that each first pixel electrode group 12 includes four first pixel electrode subsets 120, each second pixel electrode group 14 includes four second pixel electrode subsets 140, each first pixel electrode subset 120 includes a first data line 122 and a row of pixel electrodes 10, and each second pixel electrode subset 140 includes a second data line 142 and a row of pixel electrodes 10.
The polarity conversion frequency of the pixel electrode 10 of this embodiment is lower than that of the first embodiment, and the effect of improving the cross talk problem when the pixel electrode 10 is inverted is better, but the effect of improving the flicker problem of the display panel is not as good as that of the first embodiment, and the two embodiments are respectively suitable for different use environments and requirements.
Fig. 5 is a schematic structural diagram of a pixel driving system according to a third embodiment of the present invention, as shown in the drawing, the difference between the third embodiment and the first embodiment is that a first data line 122 is connected to a row of pixel electrodes 10 to form a first pixel electrode sub-group 120, an even number of adjacent pixel electrodes 10 sub-groups form a first pixel electrode group 12, a second data line 142 is connected to a row of pixel electrodes 10 to form a second pixel electrode sub-group 140, and an even number of adjacent pixel electrodes 10 sub-groups form a second pixel electrode group 14.
In this embodiment, the first data line 122 and the second data line 142 are arranged horizontally, meanwhile, the scan lines are arranged vertically, and the scan driving circuit controls the pixel electrode 10 of each column to be connected or disconnected with the first data line 122 or the second data line 142 in sequence. The third embodiment is different from the first embodiment in the arrangement of the first data line 122 and the second data line 142, and has the same use effect as the first embodiment, but can be applied to different use environments or use requirements. For example, the pixel electrode 10 provided in the first embodiment mounts the data driving circuit 20 at the upper or lower frame of the liquid crystal display, and the scan driving circuit is mounted at the left or right frame of the liquid crystal display, while the pixel electrode 10 provided in the second embodiment mounts the data driving circuit 20 at the upper or lower frame of the liquid crystal display, and the scan driving circuit is mounted at the upper or lower frame of the liquid crystal display.
Fig. 6 is a schematic diagram of an lcd according to an embodiment of the present invention, wherein the lcd includes a common electrode 30, a liquid crystal layer 40 and a pixel driving system, and the liquid crystal layer 40 is disposed between the common electrode 30 and the pixel electrode 10 and controls liquid crystal deflection by the data driving circuit 20 to change image output.
Furthermore, the liquid crystal display also comprises a backlight module, the liquid crystal molecules do not emit light, the backlight module is required to provide a backlight source, and the light transmittance of the backlight source penetrating through the display panel can be changed by changing the deflection angle of the liquid crystal molecules, so that the brightness and the content of images displayed by the liquid crystal display are changed.
The polarity of the bias voltage applied to each pixel electrode 10 in the first pixel electrode group 12 is the same, and the polarity of the bias voltage applied to each pixel electrode 10 in the second pixel electrode group 14 is the same, so that the problem of cross talk when the pixel electrodes 10 are inverted is solved; the first pixel electrode group 12 and the second pixel electrode group 14 are alternately arranged in sequence, and the polarity of the bias voltage applied to each pixel electrode 10 of the first pixel electrode group 12 is opposite to that of each pixel electrode 10 of the second pixel electrode group 14, so that the problem of flicker of the display panel is solved. The bias voltage conversion trends of even number of first pixel electrode subgroups 120 in the first pixel electrode group 12 are opposite and mutually offset, the bias voltage conversion trends of even number of second pixel electrode subgroups 140 in the second pixel electrode group 14 are also opposite and mutually offset, when the pixel electrodes 10 and the common electrodes 30 work in a matching way, the bias voltage applied to the pixel electrodes 10 cannot influence and change the common voltage, the voltage difference between the bias voltage for dark state display and the common voltage is stable and unchanged, the pixel electrodes 10 for dark state display normally display the dark state effect, and the phenomenon that the display appears white is avoided.
While the invention has been described with reference to a number of illustrative embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A pixel driving system comprises a data driving circuit and a pixel electrode array electrically connected with each other, wherein the pixel electrode array comprises a plurality of first pixel electrode groups and a plurality of second pixel electrode groups which are sequentially and alternately arranged along the same direction, the first pixel electrode group includes an even number of first data lines each connected between a row of the pixel electrodes and the data driving circuit, the second pixel electrode group includes an even number of second data lines each connected between one row of the pixel electrodes and the data driving circuit, the pixel electrodes comprise first brightness electrodes and second brightness electrodes, the first brightness electrodes and the second brightness electrodes in each row are sequentially and alternately arranged, and the bias voltage of the first brightness electrodes in the same row has the same polarity as the bias voltage of the second brightness electrodes; the absolute value of the difference between the bias voltage of the first brightness electrode and the common voltage is larger than the absolute value of the difference between the bias voltage of the second brightness electrode and the common voltage, so that the first brightness electrode displays a bright state and the second brightness electrode displays a dark state; in the same frame, the data driving circuit applies bias voltages with opposite polarities to the pixel electrodes of the first pixel electrode group and the pixel electrodes of the second pixel electrode group.
2. The pixel driving system according to claim 1, wherein the data driving circuit comprises a first output driver and a second output driver, the first output driver and the second output driver have opposite polarities of bias voltages, the first output driver is electrically connected to the first pixel electrode group through the first data line, and the second output driver is electrically connected to the second pixel electrode group through the second data line.
3. The pixel driving system according to claim 1, further comprising a scan driving circuit and scan lines, wherein the scan driving circuit is electrically connected to the pixel electrodes through the scan lines and controls on/off states among the first data lines, the second data lines, and the pixel electrodes.
4. A liquid crystal display comprising a common electrode, a liquid crystal layer and the pixel driving system of any one of claims 1 to 3, the liquid crystal layer being disposed between the common electrode and the pixel electrode and controlling liquid crystal deflection by the data driving circuit to change an image output.
5. A pixel driving method, comprising:
providing a pixel drive system according to any one of claims 1-3, the pixel drive system comprising a first set of output drive and first pixel electrodes, a second set of output drive and second pixel electrodes electrically connected to each other,
the system mainboard sends a digital signal containing image information to the time sequence control circuit;
the time sequence control circuit processes the digital signal and then sends a polarity inversion signal to the data driving circuit;
the first output driver of the data driving circuit applies a bias voltage to each pixel electrode of the first pixel electrode group, and the second output driver applies a bias voltage having a polarity opposite to that of the first output driver output to each pixel electrode of the second pixel electrode group.
6. The pixel driving method according to claim 5, wherein the "the first output driving of the data driving circuit applies a bias voltage to each pixel electrode of the first pixel electrode group, and the second output driving applies a bias voltage having a polarity opposite to that of the first output driving output to each pixel electrode of the second pixel electrode group" includes: the first output drive applies the bias voltages of opposite polarities to the first pixel electrode group in odd and even frames, and the second output drive applies the bias voltages of opposite polarities to the second pixel electrode group in odd and even frames.
7. The pixel driving method according to claim 6, wherein the "the first output driving of the data driving circuit applies a bias voltage to each pixel electrode of the first pixel electrode group, and the second output driving applies a bias voltage having a polarity opposite to that of the first output driving output to each pixel electrode of the second pixel electrode group" includes: the first output driver and the second output driver may both output a bright-state voltage and a dark-state voltage, an absolute value of a difference between the bright-state voltage and a common voltage is larger than an absolute value of a difference between the dark-state voltage and the common voltage, the first output driver sequentially outputs the bright-state voltage and the dark-state voltage to each of the pixel electrodes of the first pixel electrode group, and the second output driver sequentially outputs the bright-state voltage and the dark-state voltage to each of the pixel electrodes of the second pixel electrode group.
8. The pixel driving method according to claim 7, wherein an absolute value of a difference between the bright-state voltage and a common voltage is larger than an absolute value of a difference between the dark-state voltage and the common voltage.
9. The pixel driving method according to claim 5, wherein the step of sending the polarity inversion signal to the data driving circuit after the digital signal is processed by the timing control circuit comprises sending a clock signal to a scan driving circuit, and the scan driving circuit individually controls the on/off state of each pixel electrode and the data driving circuit according to the clock signal.
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| JP2019184638A (en) * | 2018-04-02 | 2019-10-24 | シャープ株式会社 | Liquid crystal display device and electronic apparatus |
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| CN111739452B (en) | 2020-06-16 | 2022-06-07 | 深圳市华星光电半导体显示技术有限公司 | Method and device for debugging dark state voltage of liquid crystal display panel and storage medium |
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