CN108877705B - Common voltage generating circuit, source electrode driving circuit and liquid crystal display device - Google Patents
Common voltage generating circuit, source electrode driving circuit and liquid crystal display device Download PDFInfo
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- CN108877705B CN108877705B CN201810574958.XA CN201810574958A CN108877705B CN 108877705 B CN108877705 B CN 108877705B CN 201810574958 A CN201810574958 A CN 201810574958A CN 108877705 B CN108877705 B CN 108877705B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention provides a public voltage generating circuit, which receives a first public voltage and a second public voltage, and outputs a first alternating public voltage and a second alternating public voltage with opposite polarities according to a polarity inversion control signal, wherein the first alternating public voltage or the second alternating public voltage is consistent with the polarity of a data signal output by a source electrode driving circuit on a corresponding data line, and the data signal and the alternating public voltage with the consistent polarity of the data signal act on the same pixel unit of a display panel together. The invention also provides a source electrode driving circuit. The invention also provides a liquid crystal display device. According to the common voltage generation circuit, the source electrode driving circuit and the liquid crystal display device, the first alternating current common voltage or the second alternating current common voltage can be consistent with the polarity of the data signals output by the source electrode driving circuit on each data line, so that the generation of a reverse color phenomenon on a liquid crystal display panel is avoided.
Description
Technical Field
The invention relates to the field of liquid crystal display, in particular to a common voltage generating circuit, a source electrode driving circuit and a liquid crystal display device.
Background
Liquid Crystal Displays (LCDs) have many advantages such as being light and thin, saving energy, and having no radiation, and thus have gradually replaced conventional Cathode Ray Tube (CRT) displays. Liquid crystal displays are widely used in high definition digital televisions, desktop computers, Personal Digital Assistants (PDAs), notebook computers, mobile phones, digital cameras, and other electronic devices.
Currently, in order to meet various requirements of liquid crystal display performance, liquid crystal displays include display modes such as a wide viewing angle display mode and a narrow viewing angle display mode. While the common voltage applied to the common electrode in different display modes is not exactly the same, the common voltage can be divided into a Dc Common Voltage (DCVCOM) and an Ac Common Voltage (ACVCOM), and in the narrow viewing angle mode, the common voltage applied to the common electrode is the Ac Common Voltage (ACVCOM).
However, the Ac Common Voltage (ACVCOM) applied to the common electrode needs to be consistent with the polarity of the data signal output by the source driving circuit on the corresponding data line, i.e. a fixed polarity relationship is maintained, otherwise, a color inversion phenomenon may occur on the liquid crystal display panel. However, in the prior art, the fixed polarity relationship can be maintained only when the liquid crystal display panel is normally powered on, and the fixed polarity relationship cannot be set, so that a phenomenon of reverse color occurs when the screen is expanded.
Disclosure of Invention
In view of the above, the present invention is directed to a common voltage generating circuit, a source driving circuit and a liquid crystal display device, which can solve the problem of the occurrence of a color inversion phenomenon on a liquid crystal display panel.
Specifically, the present invention provides a common voltage generating circuit, which includes a common voltage generating circuit, wherein the common voltage generating circuit receives a first common voltage and a second common voltage, and outputs a first ac common voltage and a second ac common voltage having opposite polarities according to a polarity inversion control signal output by a source driving circuit, and the first ac common voltage or the second ac common voltage is identical to a polarity of a data signal output by the source driving circuit on a corresponding data line, and the data signal and the ac common voltage having the same polarity as the data signal are applied to the same pixel unit of a display panel together.
Preferably, the polarity inversion control signal is from a data decoder of the source driving circuit or from a timing control circuit.
Preferably, with each polarity inversion of the polarity inversion control signal, the voltage of the first alternating common voltage changes from the first common voltage to the second common voltage or from the second common voltage to the first common voltage.
Preferably, the common voltage generating circuit includes a first switching element, a second switching element, a third switching element, a fourth switching element, and a first inverting element. The first switch element comprises a first control end, a first path end and a second path end, the first control end of the first switch element receives the polarity inversion control signal, and the second path end of the first switch element receives the second common voltage. The second switch element comprises a second control end, a third path end and a fourth path end, the second control end of the second switch element receives a polarity inversion signal of the polarity inversion control signal, and the fourth path end of the second switch element receives the second common voltage. The third switching element comprises a third control end, a fifth path end and a sixth path end, the third control end of the third switching element is connected with the third path end of the second switching element, the fifth path end of the third switching element receives the first common voltage, and the sixth path end of the third switching element is connected with the first path end of the first switching element. The fourth switch element comprises a fourth control end, a seventh path end and an eighth path end, the fourth control end of the fourth switch element is connected with the first path end of the first switch element, the seventh path end of the fourth switch element receives the second public voltage, and the eighth path end of the fourth switch element is connected with the third path end of the second switch element and outputs the first alternating public voltage. The first inverting element comprises an input end and an output end, the input end of the first inverting element is connected with the eighth path end of the fourth switching element, and the output end of the first inverting element outputs the second alternating current public voltage.
Preferably, the first switching element and the second switching element are NMOS transistors, and the third switching element and the fourth switching element are PMOS transistors.
Preferably, the common voltage generating circuit includes a second inverting element, the second inverting element includes an input terminal and an output terminal, the input terminal of the second inverting element receives the polarity inversion control signal, and the output terminal of the second inverting element is connected to the second control terminal of the second switching element.
Preferably, the first ac common voltage corresponds to a polarity of a data signal output from the source driving circuit on a data line of an odd column, and the second ac common voltage corresponds to a polarity of a data signal output from the source driving circuit on a data line of an even column.
Preferably, the first ac common voltage corresponds to a polarity of the data signal output from the source driving circuit on the data line of the odd-numbered column, and the first ac common voltage corresponds to a polarity of the data signal output from the source driving circuit on the data line of the even-numbered column.
The invention also provides a source electrode driving circuit which comprises the common voltage generating circuit.
The invention also provides a liquid crystal display device which comprises the common voltage generating circuit.
According to the common voltage generating circuit, the source electrode driving circuit and the liquid crystal display device, the common voltage generating circuit receives the first common voltage and the second common voltage and outputs the first alternating current common voltage and the second alternating current common voltage with opposite polarities according to the polarity inversion control signal, so that the first alternating current common voltage or the second alternating current common voltage can be consistent with the polarities of the data signals output by the source electrode driving circuit on each data line, and the generation of the reverse color phenomenon on the liquid crystal display panel is avoided.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic connection diagram of a common voltage generation circuit according to an embodiment.
Fig. 2 is a circuit connection diagram of a common voltage generating circuit according to an embodiment.
FIG. 3 is a waveform diagram of an output voltage of the common voltage generating circuit according to an embodiment.
FIG. 4 is a waveform diagram of an output voltage of the common voltage generating circuit according to an embodiment.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose, the following detailed description is given to specific embodiments, methods, steps, structures, features and effects of the common voltage generating circuit, the source driving circuit and the liquid crystal display device according to the present invention with reference to the accompanying drawings and preferred embodiments.
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings. While the invention has been described in connection with specific embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.
First embodiment
Referring to fig. 1, fig. 1 is a connection schematic diagram of a common voltage generating circuit according to an embodiment. As shown in fig. 1, the common voltage generating circuit of the present embodiment includes a common voltage generating circuit 100, the common voltage generating circuit 100 receives a first common voltage VCOM1 and a second common voltage VCOM2, and outputs a first ac common voltage ACVCOM1 and a second ac common voltage ACVCOM2 with opposite polarities according to a polarity inversion control signal POL output by a source driving circuit 200, and the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM2 is consistent with the polarities of data signals (S1, S2.. Sn in fig. 1) output by the source driving circuit 200 on corresponding data lines, and the data signals and the ac common voltage consistent with the polarity of the data signals are commonly applied to the same pixel unit of a display panel 300.
Specifically, the common voltage generating circuit of the present embodiment includes a common voltage generating circuit 100, the common voltage generating circuit 100 receives a first common voltage VCOM1 and a second common voltage VCOM2, and outputs a first ac common voltage ACVCOM1 and a second ac common voltage ACVCOM2 with opposite polarities according to a polarity inversion control signal POL, wherein the polarity inversion control signal POL ensures that the polarity of the data signal output by the source driving circuit 200 on each data line is changed, and the first ac common voltage ACVCOM1 and the second ac common voltage ACVCOM2 are also changed simultaneously, so that the polarity of the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM2 can be consistent with the polarity of the data signal (S1, S2.. Sn in fig. 1) output by the source driving circuit 200 on each data line, for example, the first ac common voltage ACVCOM1 can be consistent with the data signal (S1, s3..) the polarities of the first ac common voltage ACVCOM2 and the data signal (S2, S4..) output by the data line of the even column are kept consistent, so that the data signal (S1, S3..) output by the data line of the odd column is a positive polarity signal, the data signal (S2, S4..) output by the data line of the even column is a negative polarity signal, accordingly, the first ac common voltage ACVCOM1 outputs a positive polarity signal, and the second ac common voltage ACVCOM2 outputs a negative polarity signal; the polarity inversion control signal POL performs high-low level conversion so that the data signals output from the data lines are inverted in polarity, and the first ac common voltage ACVCOM1 and the second ac common voltage ACVCOM2 are simultaneously inverted in polarity, so that the data signals (S1, S3..) output from the data lines in the odd-numbered columns become negative polarity signals, the data signals (S2, S4..) output from the data lines in the even-numbered columns become positive polarity signals, and accordingly, the first ac common voltage ACVCOM1 outputs a negative polarity signal, and the second ac common voltage ACVCOM2 outputs a positive polarity signal. Thus, the data signal output from the data line maintains the same polarity as the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM 2. Similarly, when the polarity inversion control signal POL is changed to the high or low level again, the data signal output from the data line maintains the same polarity as the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM 2. The data signal and the ac common voltage having the same polarity as the data signal are commonly applied to the same pixel cell of the display panel 300, for example, the data signal (S1, S3.) output by the data line in the odd-numbered column and the first ac common voltage ACVCOM1 are commonly applied to the same pixel cell of the display panel, and the data signal (S2, S4.) output by the data line in the even-numbered column and the second ac common voltage ACVCOM2 are commonly applied to the same pixel cell of the display panel. Therefore, the ac common voltage applied to the common electrode corresponding to the pixel unit is consistent with the polarity of the data signal output by the source driving circuit 200 on the corresponding data line, thereby preventing the occurrence of the reverse color phenomenon on the liquid crystal display panel 300.
The common electrode corresponding to all the pixel units connected to a data line may be the same, the common electrode receives the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM2 with the same polarity as the polarity of the data line, and the connection line for receiving signals may be obtained by etching.
In one embodiment, the polarity inversion control signal POL may be, but is not limited to, from a data decoder of the source driving circuit 200 or from a timing control circuit. Among them, the data decoder of the source driving circuit 200 may be configured to receive the data signal transmitted to the source driving circuit 200 and decode the polarity inversion control signal POL, the image data signal, and the like.
The present invention is not limited to the specific voltage waveform of the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM2, and those skilled in the art can convert the received first common voltage VCOM1 and the second common voltage VCOM2 into the corresponding first ac common voltage ACVCOM1 or second common voltage VCOM2 according to the display mode. In one embodiment, with each polarity inversion of the polarity inversion control signal POL, the voltage of the first ac common voltage ACVCOM1 changes from the first common voltage VCOM1 to the second common voltage VCOM2 or from the second common voltage VCOM2 to the first common voltage VCOM 1.
In the common voltage generating circuit of this embodiment, the common voltage generating circuit 100 receives the first common voltage VCOM1 and the second common voltage VCOM2 and outputs the first ac common voltage ACVCOM1 and the second ac common voltage ACVCOM2 with opposite polarities according to the polarity inversion control signal POL, so that the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM2 can keep the same polarity as the data signals output by the source driving circuit 200 on each data line, thereby preventing the generation of the reverse color phenomenon on the liquid crystal display panel 300.
Second embodiment
Fig. 2 is a circuit connection diagram of a common voltage generating circuit according to an embodiment. As shown in fig. 2, the present embodiment provides a specific circuit connection of the common voltage generating circuit 100 in the common voltage generating circuit. The common voltage generating circuit 100 includes a first switching element T1, a second switching element T2, a third switching element T3, a fourth switching element T4, and a first inverting element 101. The first switching element T1 includes a first control terminal, a first path terminal, and a second path terminal, the first control terminal of the first switching element T1 receives the polarity inversion control signal POL, and the second path terminal of the first switching element T1 receives the second common voltage VCOM 2. The second switching element T2 includes a second control terminal, a third path terminal and a fourth path terminal, the second control terminal of the second switching element T2 receives the polarity inversion signal of the polarity inversion control signal POL, and the fourth path terminal of the second switching element T2 receives the second common voltage VCOM 2. The third switching element T3 includes a third control terminal, a fifth path terminal and a sixth path terminal, the third control terminal of the third switching element T3 is connected to the third path terminal of the second switching element T2, the fifth path terminal of the third switching element T3 receives the first common voltage VCOM1, and the sixth path terminal of the third switching element T3 is connected to the first path terminal of the first switching element T1. The fourth switching element T4 includes a fourth control terminal, a seventh path terminal and an eighth path terminal, the fourth control terminal of the fourth switching element T4 is connected to the first path terminal of the first switching element T1, the seventh path terminal of the fourth switching element T4 receives the first common voltage VOM1, the eighth path terminal of the fourth switching element T4 is connected to the third path terminal of the second switching element T2, and the first ac common voltage ACVCOM1 is further output. The first inverting element 101 includes an input terminal and an output terminal, the input terminal of the first inverting element 101 is connected to the eighth path terminal of the fourth switching element T4, and the output terminal of the first inverting element 101 outputs the second ac common voltage ACVCOM 2.
In an embodiment, the first switching element T1 and the second switching element T2 may be, but are not limited to, NMOS transistors, such as NPN transistors; the third switching element T3 and the fourth switching element T4 may be, but are not limited to, PMOS transistors, and may also be, for example, PNP-type transistors or the like.
In one embodiment, the common voltage generating circuit 100 includes a second inverting element having an input terminal receiving the polarity inversion control signal POL and an output terminal connected to the second control terminal of the second switching element T2.
Specifically, the second common voltage VCOM2 is a low voltage lower than the turn-on voltages of the third switching element T3 and the fourth switching element T4, that is, when the third control terminal of the third switching element T3 receives the second common voltage VCOM2, the third switching element T3 is turned on, the fifth path terminal and the sixth path terminal thereof are turned on, and when the fourth control terminal of the fourth switching element T4 receives the second common voltage VCOM2, the fourth switching element T4 is turned on, and the seventh path terminal and the eighth path terminal thereof are turned on. When the polarity inversion control signal POL is at a high level, the first control terminal of the first switching element T1 receives the polarity inversion control signal POL as a high level, so that the first switching element T1 is turned on, so that the first path terminal of the first switching element T1 receives the second common voltage VCOM2 as a low level through the turned-on first switching element T1, and the first path terminal of the first switching element T1 is connected to the fourth control terminal of the fourth switching element T4, so that the fourth control terminal of the fourth switching element T4 receives a low level, so that the fourth switching element T4 is turned on, and the eighth path terminal of the fourth switching element T4 receives the first common voltage VCOM1 as a high level through the turned-on fourth switching element T4, so that the first ac common voltage ACVCOM1 output from the eighth path terminal of the fourth switching element T4 is a high level signal of the first common voltage VCOM 1. At this time, the second control terminal of the second switching element T2 receives the polarity inversion signal, i.e., the low level signal, of the polarity inversion control signal POL, so that the second switching element T2 is turned off; the eighth path terminal of the fourth switching element T4 is further connected to the third control terminal of the third switching element T3, and the third control terminal of the third switching element T3 receives a high level to turn off the third switching element T3.
Therefore, when the polarity inversion control signal POL is at a high level, only the first switching element T1 of the first switching element T1 and the second switching element T2 is turned on, only the fourth switching element T4 of the third switching element T3 and the fourth switching element T4 is turned on, the first ac common voltage ACVCOM1 is the first common voltage VCOM1, and the second ac common voltage ACVCOM2 is the first ac common voltage ACVCOM1 obtained by the first inverter, and then the second ac common voltage ACVCOM2 is a polarity inversion voltage of the first common voltage VCOM 1.
Similarly, when the polarity inversion control signal POL is at a low level, the second control terminal of the second switch element T2 receives the polarity inversion signal of the polarity inversion control signal POL and turns to a high level, so that the second switch element T2 is turned on, and the third connection terminal of the second switch element T2 receives the second common voltage VCOM2 as a low level through the turned-on second switch element T2, while the third connection terminal of the second switch element T2 is connected to the eighth connection terminal of the fourth switch element T4, so that the first ac common voltage ACVCOM1 output by the eighth connection terminal of the fourth switch element T4 is a low level signal of the second common voltage VCOM 2. And the third terminal of the second switching element T2 is connected to the third control terminal of the third switching element T3, so that the third control terminal of the third switching element T3 receives a low level to turn on the third switching element T3, and the sixth terminal of the third switching element T3 receives the first common voltage VCOM1 as a high level through the turned-on third switching element T3. At this time, the first control terminal of the first switching element T1 receives the polarity inversion signal, i.e., the high level signal, of the polarity inversion control signal POL, so that the first switching element T1 is turned off; the sixth path terminal of the third switching element T3 is further connected to the fourth control terminal of the fourth switching element T4, and the fourth control terminal of the fourth switching element T4 receives a high level to turn off the fourth switching element T4.
Therefore, when the polarity inversion control signal POL is at a low level, only the second switching element T2 of the first switching element T1 and the second switching element T2 is turned on, only the third switching element T3 of the third switching element T3 and the fourth switching element T4 is turned on, the first ac common voltage ACVCOM1 is the second common voltage VCOM2, and the second ac common voltage ACVCOM2 is the first ac common voltage ACVCOM1 obtained by the first inverter, and then the second ac common voltage ACVCOM2 is the polarity inversion voltage of the second common voltage VCOM 2.
As can be seen from the above, the common voltage generating circuit of the present embodiment is electrically connected such that the voltage of the first ac common voltage ACVCOM1 changes from the first common voltage VCOM1 to the second common voltage VCOM2 or from the second common voltage VCOM2 to the first common voltage VCOM1 with each polarity inversion of the polarity inversion control signal POL, thereby realizing polarity inversion of the first common voltage ACVCOM 1. Accordingly, with each polarity inversion of the polarity inversion control signal POL, the voltage of the second alternating common voltage ACVCOM2 is changed from the polarity inversion voltage of the first common voltage VCOM1 to the polarity inversion voltage of the second common voltage VCOM2 or from the polarity inversion voltage of the second common voltage VCOM2 to the polarity inversion voltage of the first common voltage VCOM1, achieving polarity inversion of the second common voltage ACVCOM 2.
The common voltage generating circuit of the embodiment receives the first common voltage VCOM1 and the second common voltage VCOM2 through corresponding circuit connections of the common voltage generating circuit 100, and outputs the first ac common voltage ACVCOM1 and the second ac common voltage ACVCOM2 with opposite polarities according to the polarity inversion control signal POL, so that the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM2 can be kept consistent with the polarities of the data signals output by the source driving circuit 200 on each data line, thereby preventing the generation of the reverse color phenomenon on the liquid crystal display panel 300.
Third embodiment
FIG. 3 is a waveform diagram of an output voltage of the common voltage generating circuit according to an embodiment. In this example, the first ac common voltage ACVCOM1 is identical to the polarity of the data signal output by the source driving circuit 200 on the data lines of the odd-numbered columns, and the second ac common voltage ACVCOM2 is identical to the polarity of the data signal output by the source driving circuit 200 on the data lines of the even-numbered columns, and the waveform shown in fig. 3 can be obtained.
Specifically, the first ac common voltage ACVCOM1 and the second ac common voltage ACVCOM2 follow the polarity inversion with each polarity inversion of the polarity inversion control signal POL, and the polarity of the data signal Odd Source output by the Source driving circuit 200 on the data line of the Odd column is consistent with that of the first ac common voltage ACVCOM1, so that the first ac common voltage ACVCOM1 and the data signal Odd Source output by the Source driving circuit 200 on the data line of the Odd column act together on the same pixel cell of the display panel 300, thereby avoiding the generation of the color inversion phenomenon of the pixel cell connected to the data line of the Odd column; the polarity of the second ac common voltage ACVCOM2 is consistent with the polarity of the data signal Even Source output by the Source driving circuit 200 on the data lines of the Even columns, so that the second ac common voltage ACVCOM2 and the data signal Even Source output by the Source driving circuit 200 on the data lines of the Even columns jointly act on the same pixel unit of the display panel 300, and the occurrence of the reverse color phenomenon of the pixel unit connected to the data lines of the Even columns is avoided. Because the first ac common voltage ACVCOM1 and the second ac common voltage ACVCOM2 have opposite polarities, the polarity of the Odd data signal Odd Source output on the data lines of the Odd columns is opposite to the polarity of the Even data signal Even Source output on the data lines of the Even columns, so that the pixel cells on the display panel 300 can be column-inverted or dot-inverted.
FIG. 4 is a waveform diagram of an output voltage of the common voltage generating circuit according to an embodiment. As shown, in an embodiment, the first ac common voltage ACVCOM1 is identical to the polarity of the data signal output by the source driving circuit 200 on the data lines of the odd-numbered columns, and the first ac common voltage ACVCOM1 is also identical to the polarity of the data signal output by the source driving circuit 200 on the data lines of the even-numbered columns. Specifically, the first ac common voltage ACVCOM1 is consistent with the polarity of the data signal output by the source driving circuit 200 on the data line of the odd column, so that the first ac common voltage ACVCOM1 and the data signal output by the source driving circuit 200 on the data line of the odd column jointly act on the same pixel cell of the display panel 300, thereby avoiding the generation of the reverse color phenomenon of the pixel cell connected to the data line of the odd column; by the first ac common voltage ACVCOM1 and the data signals output by the source driving circuit 200 on the data lines of the even columns having the same polarity, the first ac common voltage ACVCOM1 and the data signals output by the source driving circuit 200 on the data lines of the even columns act on the same pixel cell of the display panel 300 together, and the occurrence of the reverse color phenomenon of the pixel cell connected to the data lines of the even columns is avoided. The ac common voltage ACVCOM1 not only matches the polarity of the data signals output by the data lines in the odd-numbered columns, but also matches the polarity of the data signals output by the data lines in the even-numbered columns, so that the pixel cells on the display panel 300 can be row-inverted or frame-inverted. In the common voltage generating circuit of the present embodiment, the polarity of the data signal output by the source driving circuit 200 on the data line of the odd-numbered column or the even-numbered column is kept consistent with the polarity of the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM2, so as to avoid the generation of the reverse color phenomenon on the liquid crystal display panel 300, and simultaneously, the polarity of the pixel unit on the display panel 300 is reversed correspondingly.
Fourth embodiment
The present embodiment further provides a source driving circuit 200, wherein the source driving circuit 200 includes the common voltage generating circuit.
In the source driving circuit 200 of the present embodiment, the common voltage generating circuit 100 receives the first common voltage VCOM1 and the second common voltage VCOM2 and outputs the first ac common voltage ACVCOM1 and the second ac common voltage ACVCOM2 with opposite polarities according to the polarity inversion control signal POL, so that the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM2 can be kept consistent with the polarity of the data signal output by the source driving circuit 200 on each data line, thereby preventing the generation of the color inversion phenomenon on the liquid crystal display panel 300.
Fifth embodiment
The embodiment also provides a liquid crystal display device which comprises the common voltage generating circuit.
In the liquid crystal display device of the embodiment, the common voltage generating circuit 100 receives the first common voltage VCOM1 and the second common voltage VCOM2 and outputs the first ac common voltage ACVCOM1 and the second ac common voltage ACVCOM2 with opposite polarities according to the polarity inversion control signal POL, so that the first ac common voltage ACVCOM1 or the second ac common voltage ACVCOM2 can be kept consistent with the polarity of the data signal output by the source driving circuit 200 on each data line, thereby preventing the generation of the color inversion phenomenon on the liquid crystal display panel 300.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A common voltage generating circuit (100) receives a first common voltage (VCOM1) and a second common voltage (VCOM2), and outputs a first alternating common voltage (ACVCOM1) and a second alternating common voltage (ACVCOM2) having opposite polarities according to a polarity inversion control signal (POL), and the first alternating common voltage (ACVCOM1) or the second alternating common voltage (ACVCOM2) is identical to the polarity of a data signal output by a source driving circuit (200) on a corresponding data line, and the data signal and the alternating common voltage identical to the polarity of the data signal are applied to the same pixel cell of a display panel (300) together; wherein the content of the first and second substances,
the common voltage generation circuit (100) includes:
a first switching element (T1), the first switching element (T1) including a first control terminal, a first path terminal and a second path terminal, the first control terminal of the first switching element (T1) receiving the polarity inversion control signal (POL), the second path terminal of the first switching element (T1) receiving the second common voltage (VCOM 2);
a second switching element (T2), the second switching element (T2) including a second control terminal, a third path terminal and a fourth path terminal, the second control terminal of the second switching element (T2) receiving the polarity inversion signal of the polarity inversion control signal (POL), the fourth path terminal of the second switching element (T2) receiving the second common voltage (VCOM 2);
a third switching element (T3), the third switching element (T3) including a third control terminal, a fifth pass terminal and a sixth pass terminal, the third control terminal of the third switching element (T3) being connected to the third pass terminal of the second switching element (T2), the fifth pass terminal of the third switching element (T3) receiving the first common voltage (VCOM1), the sixth pass terminal of the third switching element (T3) being connected to the first pass terminal of the first switching element (T1);
a fourth switching element (T4), the fourth switching element (T4) including a fourth control terminal, a seventh path terminal and an eighth path terminal, the fourth control terminal of the fourth switching element (T4) being connected to the first path terminal of the first switching element (T1), the seventh path terminal of the fourth switching element (T4) receiving the first common voltage (VCOM1), the eighth path terminal of the fourth switching element (T4) being connected to the third path terminal of the second switching element (T2), and further outputting the first alternating common voltage (ACVCOM 1);
a first inverting element (101), the first inverting element (101) including an input terminal and an output terminal, the input terminal of the first inverting element (101) being connected to the eighth path terminal of the fourth switching element (T4), the output terminal of the first inverting element (101) outputting the second alternating common voltage (ACVCOM 2).
2. The common voltage generating circuit as claimed in claim 1, wherein the polarity inversion control signal (POL) is from a data decoder of the source driving circuit (200) or from a timing control circuit.
3. The common voltage generating circuit of claim 1, wherein the voltage of the first alternating common voltage (ACVCOM1) changes from the first common voltage (VCOM1) to the second common voltage (VCOM2) or from the second common voltage (VCOM2) to the first common voltage (VCOM1) with each polarity inversion of the polarity inversion control signal (POL).
4. The common voltage generating circuit as claimed in claim 1, wherein the first switching element (T1) and the second switching element (T2) are NMOS transistors, and the third switching element (T3) and the fourth switching element (T4) are PMOS transistors.
5. The common voltage generating circuit according to claim 1, wherein said common voltage generating circuit (100) comprises a second inverting element, said second inverting element comprising an input terminal and an output terminal, said input terminal of said second inverting element receiving said polarity reversing control signal (POL), said output terminal of said second inverting element being connected to said second control terminal of said second switching element (T2).
6. The common voltage generating circuit as claimed in claim 1, wherein the first ac common voltage (ACVCOM1) corresponds to a polarity of a data signal output by the source driving circuit (200) on a data line of an odd column, and the second ac common voltage (ACVCOM2) corresponds to a polarity of a data signal output by the source driving circuit (200) on a data line of an even column.
7. The common voltage generating circuit as claimed in claim 1, wherein the first ac common voltage (ACVCOM1) coincides with a polarity of the data signal output by the source driving circuit (200) on the data lines of the odd columns, and the first ac common voltage (ACVCOM1) also coincides with a polarity of the data signal output by the source driving circuit (200) on the data lines of the even columns.
8. A source driver circuit, characterized in that the source driver circuit (200) comprises a common voltage generating circuit according to any one of claims 1 to 7.
9. A liquid crystal display device characterized by comprising the common voltage generating circuit according to any one of claims 1 to 7.
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| CN113076027B (en) * | 2021-03-26 | 2024-01-19 | 厦门天马微电子有限公司 | Driving method of touch display panel, touch display panel and device |
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| CN105629606A (en) * | 2016-01-13 | 2016-06-01 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and driving method thereof |
| JP2017156401A (en) * | 2016-02-29 | 2017-09-07 | 京セラディスプレイ株式会社 | Dot matrix type display device |
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| CN101308271B (en) * | 2008-06-30 | 2011-10-26 | 昆山龙腾光电有限公司 | Liquid crystal panel, LCD display device and its drive method |
| KR101609836B1 (en) * | 2009-12-10 | 2016-04-07 | 엘지디스플레이 주식회사 | Liquid crystal display device and method of manufacturing the same |
| WO2012141133A1 (en) * | 2011-04-12 | 2012-10-18 | シャープ株式会社 | Liquid crystal display device and multi-display system |
| CN105609066B (en) * | 2015-12-31 | 2018-07-13 | 上海天马微电子有限公司 | A kind of display panel and its driving method and display device |
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| CN105629606A (en) * | 2016-01-13 | 2016-06-01 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and driving method thereof |
| JP2017156401A (en) * | 2016-02-29 | 2017-09-07 | 京セラディスプレイ株式会社 | Dot matrix type display device |
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