CN110349549B - Driving method and driving circuit of liquid crystal display panel and display device - Google Patents
Driving method and driving circuit of liquid crystal display panel and display device Download PDFInfo
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- CN110349549B CN110349549B CN201910645668.4A CN201910645668A CN110349549B CN 110349549 B CN110349549 B CN 110349549B CN 201910645668 A CN201910645668 A CN 201910645668A CN 110349549 B CN110349549 B CN 110349549B
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
Abstract
The invention provides a driving method and a driving circuit of a liquid crystal display panel and a display device, and belongs to the technical field of display. The driving method of the liquid crystal display panel comprises the following steps: and sending a common electrode signal to a common electrode line of the liquid crystal display panel, and enabling the common voltage signal passing through the common electrode line to be inverted between a first common voltage and a second common voltage by taking K frame as a unit, wherein the polarities of the first common voltage and the second common voltage relative to a reference voltage are opposite, and K is an integer greater than 1. The technical scheme of the invention can improve the color gamut of the display equipment, reduce the dynamic power consumption of the circuit system and reduce the EMI.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving method, a driving circuit, and a display device for a liquid crystal display panel.
Background
In the related art lcd panel, a higher driving voltage is required to drive the liquid crystal for inversion, and since the data voltage transmitted on the data line cannot meet the requirement of the driving voltage, the driving voltage needs to be increased by inverting the common voltage signal, the inversion frequency of the common voltage signal is a frame frequency, and adjacent frames generate a larger voltage change of the liquid crystal capacitor plate due to polarity inversion, which results in a longer charging and discharging time, and a shorter color gamut of the lcd panel, and the inversion of the common voltage signal results in a higher dynamic power consumption of the circuit system, and also causes EMI (Electro Magnetic Interference) to other electrical signals.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a driving method, a driving circuit and a display device for a liquid crystal display panel, which can improve the color gamut of a display device, reduce the dynamic power consumption of a circuit system and reduce EMI.
To solve the above technical problem, embodiments of the present invention provide the following technical solutions:
in one aspect, a method for driving a liquid crystal display panel includes:
and sending a common electrode signal to a common electrode line of the liquid crystal display panel, and enabling a common voltage signal passing through the common electrode line to be inverted between a first common voltage and a second common voltage by taking K frame as a unit, wherein the polarities of the first common voltage and the second common voltage relative to a reference voltage are opposite, and K is an integer greater than 1.
Optionally, the liquid crystal display panel includes M different color light sources, and K is equal to M.
Optionally, the method further comprises:
when a common electrode signal sent to the common electrode line is a first common voltage, inputting a first gray scale voltage to a pixel electrode of a pixel unit; when the common electrode signal sent to the common electrode line is a second common voltage, inputting a second gray scale voltage to the pixel electrode of the pixel unit, wherein the polarity of the first gray scale voltage relative to the first common voltage is opposite to the polarity of the second gray scale voltage relative to the second common voltage.
Optionally, the pixel unit includes a first frame pixel, a second frame pixel, and a third frame pixel that are different in color, and when a common electrode signal sent to the common electrode line is a first common voltage, the gray-scale voltages input to the first frame pixel, the second frame pixel, and the third frame pixel have the same polarity with respect to a reference voltage; when the common electrode signal sent to the common electrode line is a second common voltage, the gray scale voltages input to the first frame pixels, the second frame pixels and the third frame pixels have the same polarity relative to a reference voltage.
Optionally, the liquid crystal display panel is a transparent display panel.
The embodiment of the present invention further provides a driving circuit of a liquid crystal display panel, including:
and a common electrode driving unit for transmitting a common electrode signal to a common electrode line of the liquid crystal display panel to invert a common voltage signal passing through the common electrode line between a first common voltage and a second common voltage in units of K frames, the first common voltage and the second common voltage having opposite polarities with respect to a reference voltage, and K being an integer greater than 1.
Optionally, the liquid crystal display panel includes M different color light sources, and K is equal to M.
Optionally, the method further comprises:
the data driving unit is used for inputting a first gray scale voltage to the pixel electrode of the pixel unit when the common electrode signal sent to the common electrode line is a first common voltage; when the common electrode signal sent to the common electrode line is a second common voltage, inputting a second gray scale voltage to the pixel electrode of the pixel unit, wherein the polarity of the first gray scale voltage relative to the first common voltage is opposite to the polarity of the second gray scale voltage relative to the second common voltage.
Optionally, the pixel unit includes a first frame pixel, a second frame pixel, and a third frame pixel that are different in color, and when a common electrode signal sent to the common electrode line is a first common voltage, the polarities of gray-scale voltages input to the first frame pixel, the second frame pixel, and the third frame pixel by the data driving unit with respect to a reference voltage are the same; when the common electrode signal sent to the common electrode line is a second common voltage, the gray scale voltages input to the first frame pixels, the second frame pixels and the third frame pixels by the data driving unit have the same polarity relative to a reference voltage.
The embodiment of the invention also provides a display device which comprises the driving circuit of the liquid crystal display panel.
The embodiment of the invention has the following beneficial effects:
in the above scheme, the common voltage signal passing through the common electrode line is inverted between the first common voltage and the second common voltage by taking a K frame as a unit, wherein K is an integer greater than 1, so that the inversion frequency of the common voltage signal can be reduced, the charging and discharging time of the liquid crystal capacitor can be further reduced, the charging quality is improved, the lighting time can be correspondingly increased, the color gamut of the display device is improved, and in addition, the dynamic power consumption of a circuit system can be reduced by reducing the inversion frequency of the common voltage signal, and the EMI (electro-magnetic interference) is reduced.
Drawings
FIG. 1 is a timing diagram of the FSC display mode;
FIG. 2 is a diagram illustrating synchronization of common voltage signal inversion and frame inversion in the related art;
FIG. 3 is a schematic diagram illustrating a common voltage signal inversion according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an embodiment of the present invention, in which an FPGA controls the switching frequency of a COM generation circuit;
fig. 5 is a schematic diagram of controlling a polarity inversion signal POL of the source driver through the FPGA according to the embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The market demand for transparent display has been strong, the liquid crystal display panel in the transparent display mode has a low Color gamut, and the display mode of FSC (Field-Sequential Color) is adopted.
When the liquid crystal display panel in the transparent display mode includes three color pixels of red (R), green (G), and blue (B), the timing diagram of the FSC display mode is shown in fig. 1, the display time of each color frame includes three frames, DATA of three colors are sequentially written in the three frames, each frame includes a DATA refresh write-in phase (R-DATA, B-DATA, G-DATA) and a backlight lighting phase (R-LED, G-LED, B-LED), the DATA of three colors and the backlight are sequentially refreshed in a time-sharing manner, wherein the backlight lighting phase is used for displaying, and the backlight lighting phase is lighting time.
In addition, in some liquid crystal display panels of the transparent display mode, a higher driving voltage is required due to the type of liquid crystal used, for example, when the liquid crystal display panel uses PSLC (polymer network stabilized liquid crystal), the driving voltage (12V) is required, whereas the conventional driving scheme can only provide a driving voltage of up to 9V, and the VOP (operating voltage) of the liquid crystal needs to be increased by using a common voltage inversion method. The liquid crystal display panel of the related art adopts a mode of synchronizing the common voltage inversion and the frame inversion to achieve the effect of increasing the VOP of the liquid crystal, as shown in fig. 2, the working process includes: in the Nth frame, the pixel electrode of the red pixel inputs gray scale voltage of a first polarity, and the common electrode inputs common voltage of a second polarity, wherein the first polarity is opposite to the second polarity; in the (N + 1) th frame, inputting a gray scale voltage of a second polarity to a pixel electrode of a green pixel, and simultaneously inputting a common voltage of a first polarity to a common electrode; in the (N + 2) th frame, inputting a gray scale voltage of a first polarity to a pixel electrode of a blue pixel, and simultaneously inputting a common voltage of a second polarity to a common electrode; in the (N + 3) th frame, inputting a gray scale voltage of a second polarity to a pixel electrode of a red pixel, and simultaneously inputting a common voltage of a first polarity to a common electrode; in the (N + 4) th frame, inputting a gray scale voltage of a first polarity to a pixel electrode of a green pixel, and simultaneously inputting a common voltage of a second polarity to a common electrode; in the (N + 5) th frame, inputting a gray scale voltage of a second polarity to a pixel electrode of the blue pixel, and simultaneously inputting a common voltage of a first polarity to a common electrode; in the (N + 6) th frame, the pixel electrode of the red pixel inputs the gray scale voltage of the first polarity, and the common electrode inputs the common voltage of the second polarity, and so on.
It can be seen that the frequency of the common voltage signal inversion is a frame frequency, which causes a large voltage change of the liquid crystal capacitor plate, resulting in a long charging and discharging time, and a lighting time is compressed, resulting in a further decrease in the color gamut of the liquid crystal display panel, and the inversion of the common voltage signal results in a high dynamic power consumption of the circuit system, and also causes EMI to other electrical signals.
In order to solve the above problems, embodiments of the present invention provide a driving method, a driving circuit, and a display device for a liquid crystal display panel, which can improve a color gamut of a display device, reduce dynamic power consumption of a circuit system, and reduce EMI.
The embodiment of the invention provides a driving method of a liquid crystal display panel, which comprises the following steps:
and sending a common electrode signal to a common electrode line of the liquid crystal display panel, and enabling a common voltage signal passing through the common electrode line to be inverted between a first common voltage and a second common voltage by taking K frame as a unit, wherein the polarities of the first common voltage and the second common voltage relative to a reference voltage are opposite, and K is an integer greater than 1.
In this embodiment, the common voltage signal passing through the common electrode line is inverted between the first common voltage and the second common voltage in units of K frames, where K is an integer greater than 1, so that the inversion frequency of the common voltage signal can be reduced, the charging and discharging time of the liquid crystal capacitor can be further reduced, the charging quality is improved, the lighting time can be correspondingly increased, the color gamut of the display device is improved, and in addition, the dynamic power consumption of the circuit system can be reduced by reducing the inversion frequency of the common voltage signal, and the EMI is reduced.
In this embodiment, in two adjacent N frames, the first common voltage and the second common voltage are respectively provided to the common electrode of the pixel unit, and the driving voltage of the liquid crystal capacitor is determined by the voltage difference between the pixel electrode and the common electrode, and the change frequency of the common electrode voltage is reduced, so that the voltage change range on the pixel electrode is reduced, and thus the output voltage of the driving circuit is reduced, and the power consumption is reduced.
The value of K is larger, the lower the frequency of the public voltage signal turnover is, the shorter the charging and discharging time of the liquid crystal capacitor is, the longer the display time is, and the lower the dynamic power consumption of the circuit system is. In order to ensure the driving voltage, the gray scale voltage input to the pixel electrode of the pixel unit is opposite to the polarity of the common voltage signal, if the polarity of the common voltage signal is not reversed for a long time, the gray scale voltage input to the pixel electrode of the pixel unit is also not reversed for a long time, liquid crystal polarization is easy to occur, and the value of K cannot be too large in order to ensure that the liquid crystal is not polarized.
In order to avoid polarization of liquid crystal, the driving method further includes:
when a common electrode signal sent to the common electrode line is a first common voltage, inputting a first gray scale voltage to a pixel electrode of a pixel unit; when the common electrode signal sent to the common electrode line is a second common voltage, inputting a second gray scale voltage to the pixel electrode of the pixel unit, wherein the polarity of the first gray scale voltage relative to the first common voltage is opposite to the polarity of the second gray scale voltage relative to the second common voltage.
The liquid crystal display panel of this embodiment may be a liquid crystal display panel in an FSC display mode, in the liquid crystal display panel in the FSC display mode, the pixel unit includes a first frame pixel, a second frame pixel, and a third frame pixel that are different in color, and in different frames, by lighting light sources of different colors, the same pixel unit can display different colors. In order to ensure a higher driving voltage and reduce the charging and discharging time of pixels, when a common electrode signal sent to the common electrode line is a first common voltage, the gray scale voltages input to the first frame of pixels, the second frame of pixels and the third frame of pixels have the same polarity relative to a reference voltage; when the common electrode signal sent to the common electrode line is a second common voltage, the gray scale voltages input to the first frame pixels, the second frame pixels and the third frame pixels have the same polarity relative to a reference voltage.
As shown in fig. 2, the frequency at which the common voltage signal COM is inverted is a frame frequency, the common voltage signal is inverted between a first common voltage + V and a second common voltage (-V), and the first common voltage + V and the second common voltage (-V) have opposite polarities with respect to the reference voltage C; the gray scale voltage inputted by the pixel electrode of the red pixel is inverted between + R and-R, and the + R and-R have opposite polarities with respect to the reference voltage C; the gray scale voltage inputted by the pixel electrode of the green pixel is inverted between + G and-G, the + G and-G having opposite polarities with respect to the reference voltage C; the gray scale voltage inputted to the pixel electrode of the blue pixel is inverted between + B and-B, which have opposite polarities with respect to the reference voltage C. In the nth frame, the red pixel displays, the gray scale voltage input to the pixel electrode of the red pixel is + R, the common voltage signal COM is-V, and the liquid crystal VOP is (+ R) - (-V) (+ R) + V; in the (N + 1) th frame, data inversion is performed to avoid liquid crystal polarization, the gray scale voltage input to the pixel electrode of the green pixel is-G, COM is also inverted to + V to maintain a high VOP, and the liquid crystal VOP is (-G) - (+ V) ═ G) -V; in the (N + 2) th frame, in order to avoid liquid crystal polarization, data inversion is performed, the gray scale voltage input to the pixel electrode of the blue pixel is + B, at this time, COM is also inverted to-V in order to maintain a high VOP, and the liquid crystal VOP is (+ B) - (-V) (+ B) + V; by analogy, it can be seen that the liquid crystal VOP can be kept high by the inversion of the common voltage signal.
In this embodiment, when the liquid crystal display panel includes a red light source, a green light source, and a blue light source, the common voltage signal is inverted once every 3 frames, so that the pixel voltage of the same pixel electrode is prevented from having great voltage change in two adjacent frames, the charging and discharging time and the charging effect of the liquid crystal capacitor are ensured, and the liquid crystal is ensured not to be polarized.
As shown in fig. 3, the frequency of the common voltage signal COM inversion is 3 frames, the common voltage signal is inverted between the first common voltage + V and the second common voltage (-V), and the first common voltage + V and the second common voltage (-V) have opposite polarities with respect to the reference voltage C; the gray scale voltage inputted by the pixel electrode of the red pixel is inverted between + R and-R, and the + R and-R have opposite polarities with respect to the reference voltage C; the gray scale voltage inputted by the pixel electrode of the green pixel is inverted between + G and-G, the + G and-G having opposite polarities with respect to the reference voltage C; the gray scale voltage inputted to the pixel electrode of the blue pixel is inverted between + B and-B, which have opposite polarities with respect to the reference voltage C. In the nth frame, the red pixel displays, the gray scale voltage input to the pixel electrode of the red pixel is + R, the common voltage signal COM is-V, and the liquid crystal VOP is (+ R) - (-V) (+ R) + V; in the (N + 1) th frame, the gray scale voltage input to the pixel electrode of the green pixel is + G, the common voltage signal COM does not need to be inverted and is still-V, and the liquid crystal VOP is G- (-V) (+ G) + V; in the (N + 2) th frame, the gray scale voltage input to the pixel electrode of the blue pixel is + B, the common voltage signal COM does not need to be inverted and is still-V, and the liquid crystal VOP is (+ B) - (-V) (+ B) + V; at this time, the voltage of the liquid crystal plate is kept for three frames without inversion, so as to avoid liquid crystal polarization, when the N +4 th frame, the red pixel displays, the gray scale voltage input to the pixel electrode of the red pixel is inverted to-R, the common voltage signal COM is simultaneously inverted to + V, and the liquid crystal VOP is (-R) - (+ V) ═ R) -V; in the (N + 5) th frame, the gray scale voltage input to the pixel electrode of the green pixel is inverted to-G, the common voltage signal COM is simultaneously inverted to + V, and the liquid crystal VOP is (-G) - (+ V) ═ G) -V; in the (N + 6) th frame, the gray scale voltage input to the pixel electrode of the blue pixel is inverted to-B, the common voltage signal COM is simultaneously inverted to + V, and the liquid crystal VOP is (-B) - (+ V) ═ B) -V; and so on.
As can be seen from fig. 3, the polarities of the pixel voltages are the same in the nth frame to the N +2 th frame, and the polarities of the pixel voltages are the same in the N +3 th frame to the N +5 th frame, that is, the polarities of the pixel voltages do not change in the adjacent three frames, so that the voltage change of the adjacent frames of the same pixel electrode can be reduced, and the charging and discharging time and the charging effect of the capacitor can be ensured.
It can be seen that, on the premise of ensuring that the liquid crystal is not polarized, the present embodiment reduces the voltage variation of the liquid crystal pixel electrode plate, shortens the charge-discharge time of the liquid crystal capacitor, improves the charge quality, correspondingly increases the lighting time, and further improves the color gamut of the transparent display. Meanwhile, because the COM overturning frequency is changed to be one third of the original COM overturning frequency, the dynamic power consumption of a circuit system generating COM overturning is greatly reduced, and the EMI is also well improved.
Specifically, the liquid crystal display panel can be a transparent display panel, and the color gamut of the transparent display panel can be improved through the technical scheme of the invention.
The embodiment of the present invention further provides a driving circuit of a liquid crystal display panel, including:
and a common electrode driving unit for transmitting a common electrode signal to a common electrode line of the liquid crystal display panel to invert a common voltage signal passing through the common electrode line between a first common voltage and a second common voltage in units of K frames, the first common voltage and the second common voltage having opposite polarities with respect to a reference voltage, and K being an integer greater than 1.
In this embodiment, the common voltage signal passing through the common electrode line is inverted between the first common voltage and the second common voltage in units of K frames, where K is an integer greater than 1, so that the inversion frequency of the common voltage signal can be reduced, the charging and discharging time of the liquid crystal capacitor can be further reduced, the charging quality is improved, the lighting time can be correspondingly increased, the color gamut of the display device is improved, and in addition, the dynamic power consumption of the circuit system can be reduced by reducing the inversion frequency of the common voltage signal, and the EMI is reduced.
The value of K is larger, the lower the frequency of the public voltage signal turnover is, the shorter the charging and discharging time of the liquid crystal capacitor is, the longer the display time is, and the lower the dynamic power consumption of the circuit system is. In order to ensure the driving voltage, the gray scale voltage input to the pixel electrode of the pixel unit is opposite to the polarity of the common voltage signal, if the polarity of the common voltage signal is not reversed for a long time, the gray scale voltage input to the pixel electrode of the pixel unit is also not reversed for a long time, liquid crystal polarization is easy to occur, and the value of K cannot be too large in order to ensure that the liquid crystal is not polarized.
In order to avoid polarization of the liquid crystal, the driving device further includes:
the data driving unit is used for inputting a first gray scale voltage to the pixel electrode of the pixel unit when the common electrode signal sent to the common electrode line is a first common voltage; when the common electrode signal sent to the common electrode line is a second common voltage, inputting a second gray scale voltage to the pixel electrode of the pixel unit, wherein the polarity of the first gray scale voltage relative to the first common voltage is opposite to the polarity of the second gray scale voltage relative to the second common voltage.
The liquid crystal display panel of this embodiment may be a liquid crystal display panel in an FSC display mode, in the liquid crystal display panel in the FSC display mode, the pixel unit includes a first frame pixel, a second frame pixel, and a third frame pixel that are different in color, and in different frames, by lighting light sources of different colors, the same pixel unit can display different colors. In order to ensure a higher driving voltage and reduce the charging and discharging time of pixels, when a common electrode signal sent to the common electrode line is a first common voltage, the gray scale voltages input to the first frame of pixels, the second frame of pixels and the third frame of pixels by the data driving unit have the same polarity relative to a reference voltage; when the common electrode signal sent to the common electrode line is a second common voltage, the gray scale voltages input to the first frame pixels, the second frame pixels and the third frame pixels by the data driving unit have the same polarity relative to a reference voltage.
As shown in fig. 2, the frequency at which the common voltage signal COM is inverted is a frame frequency, the common voltage signal is inverted between a first common voltage + V and a second common voltage (-V), and the first common voltage + V and the second common voltage (-V) have opposite polarities with respect to the reference voltage C; the gray scale voltage inputted from the pixel electrode of the red pixel is inverted between + R and-R, which have opposite polarities with respect to the reference voltage C; the gray scale voltage inputted by the pixel electrode of the green pixel is inverted between + G and-G, the + G and-G having opposite polarities with respect to the reference voltage C; the gray scale voltage inputted to the pixel electrode of the blue pixel is inverted between + B and-B, which have opposite polarities with respect to the reference voltage C. In the nth frame, the red pixel displays, the gray scale voltage input to the pixel electrode of the red pixel is + R, the common voltage signal COM is-V, and the liquid crystal VOP is (+ R) - (-V) (+ R) + V; in the (N + 1) th frame, data inversion is performed to avoid liquid crystal polarization, the gray scale voltage input to the pixel electrode of the green pixel is-G, COM is also inverted to + V to maintain a high VOP, and the liquid crystal VOP is (-G) - (+ V) ═ G) -V; in the (N + 2) th frame, in order to avoid liquid crystal polarization, data inversion is performed, the gray scale voltage input to the pixel electrode of the blue pixel is + B, at this time, COM is also inverted to-V in order to maintain a high VOP, and the liquid crystal VOP is (+ B) - (-V) (+ B) + V; by analogy, it can be seen that the liquid crystal VOP can be kept high by the inversion of the common voltage signal.
In this embodiment, when the liquid crystal display panel includes a red light source, a green light source, and a blue light source, the common voltage signal is inverted once every 3 frames, so that the pixel voltage of the same pixel electrode is prevented from having great voltage variation in two adjacent frames, the charging and discharging time and the charging effect of the liquid crystal capacitor are ensured, and the liquid crystal is ensured not to be polarized.
As shown in fig. 3, the frequency of the common voltage signal COM inversion is 3 frames, the common voltage signal is inverted between the first common voltage + V and the second common voltage (-V), and the first common voltage + V and the second common voltage (-V) have opposite polarities with respect to the reference voltage C; the gray scale voltage inputted by the pixel electrode of the red pixel is inverted between + R and-R, and the + R and-R have opposite polarities with respect to the reference voltage C; the gray scale voltage inputted by the pixel electrode of the green pixel is inverted between + G and-G, the + G and-G having opposite polarities with respect to the reference voltage C; the gray scale voltage inputted to the pixel electrode of the blue pixel is inverted between + B and-B, which have opposite polarities with respect to the reference voltage C. In the nth frame, the red pixel displays, the gray scale voltage input to the pixel electrode of the red pixel is + R, the common voltage signal COM is-V, and the liquid crystal VOP is (+ R) - (-V) (+ R) + V; in the (N + 1) th frame, the gray scale voltage input to the pixel electrode of the green pixel is + G, the common voltage signal COM does not need to be inverted and is still-V, and the liquid crystal VOP is G- (-V) (+ G) + V; in the (N + 2) th frame, the gray scale voltage input to the pixel electrode of the blue pixel is + B, the common voltage signal COM does not need to be inverted and is still-V, and the liquid crystal VOP is (+ B) - (-V) (+ B) + V; at this time, the voltage of the liquid crystal plate is kept for three frames without inversion, so as to avoid liquid crystal polarization, when the N +4 th frame, the red pixel displays, the gray scale voltage input to the pixel electrode of the red pixel is inverted to-R, the common voltage signal COM is simultaneously inverted to + V, and the liquid crystal VOP is (-R) - (+ V) ═ R) -V; in the (N + 5) th frame, the gray scale voltage input to the pixel electrode of the green pixel is inverted to-G, the common voltage signal COM is simultaneously inverted to + V, and the liquid crystal VOP is (-G) - (+ V) (-G) -V; in the (N + 6) th frame, the gray scale voltage input to the pixel electrode of the blue pixel is inverted to-B, the common voltage signal COM is simultaneously inverted to + V, and the liquid crystal VOP is (-B) - (+ V) ═ B) -V; and so on.
As can be seen from fig. 3, the polarities of the pixel voltages are the same in the nth frame to the N +2 th frame, and the polarities of the pixel voltages are the same in the N +3 th frame to the N +5 th frame, that is, the polarities of the pixel voltages do not change in the adjacent three frames, so that the voltage change of the adjacent frames of the same pixel electrode can be reduced, and the charging and discharging time and the charging effect of the capacitor can be ensured.
It can be seen that, on the premise of ensuring that the liquid crystal is not polarized, the present embodiment reduces the voltage variation of the liquid crystal pixel electrode plate, shortens the charge-discharge time of the liquid crystal capacitor, improves the charge quality, correspondingly increases the lighting time, and further improves the color gamut of the transparent display. Meanwhile, the COM overturning frequency is changed to one third of the original COM overturning frequency, so that the dynamic power consumption of a circuit system generating COM overturning is greatly reduced, and the EMI is also better improved.
Specifically, the switching frequency of the COM generation circuit may be controlled by an FPGA (Field Programmable Gate Array), as shown in fig. 4, the FPGA is connected to the analog switch, and the + V or-V common voltage signal is controlled by the analog switch to be output to the common electrode of the liquid crystal display panel.
As shown in fig. 5, the polarity inversion signal POL of the source driver (source driver circuit) may be controlled by the FPGA, so as to control the positive and negative polarities of each frame data.
The embodiment of the invention also provides a display device which comprises the driving circuit of the liquid crystal display panel.
The display device includes but is not limited to: radio frequency unit, network module, audio output unit, input unit, sensor, display unit, user input unit, interface unit, memory, processor, and power supply. It will be appreciated by those skilled in the art that the above described configuration of the display device does not constitute a limitation of the display device, and that the display device may comprise more or less of the components described above, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the display device includes, but is not limited to, a display, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, and the like.
The display device may be: the display device comprises any product or component with a display function, such as a liquid crystal television, a liquid crystal display, a digital photo frame, a mobile phone, a tablet personal computer and the like, wherein the display device further comprises a flexible circuit board, a printed circuit board and a back plate.
It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the embodiments, since they are substantially similar to the product embodiments, the description is simple, and the relevant points can be referred to the partial description of the product embodiments.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present disclosure, and shall cover the scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.
Claims (4)
1. A method of driving a liquid crystal display panel, comprising:
sending a common electrode signal to a common electrode line of the liquid crystal display panel, and enabling a common voltage signal passing through the common electrode line to be inverted between a first common voltage and a second common voltage by taking K frame as a unit, wherein the polarities of the first common voltage and the second common voltage relative to a reference voltage are opposite, and K is an integer greater than 1; the liquid crystal display panel comprises M light sources with different colors, and K is equal to M;
when a common electrode signal sent to the common electrode line is a first common voltage, inputting a first gray scale voltage to a pixel electrode of a pixel unit; when a common electrode signal sent to the common electrode line is a second common voltage, inputting a second gray scale voltage to a pixel electrode of a pixel unit, wherein the polarity of the first gray scale voltage relative to the first common voltage is opposite to that of the second gray scale voltage relative to the second common voltage;
the pixel unit comprises a first frame pixel, a second frame pixel and a third frame pixel which are different in color, and when a public electrode signal sent to the public electrode line is a first public voltage, the polarities of gray scale voltages input to the first frame pixel, the second frame pixel and the third frame pixel relative to a reference voltage are the same; when the common electrode signal sent to the common electrode line is a second common voltage, the gray scale voltages input to the first frame pixels, the second frame pixels and the third frame pixels have the same polarity relative to the reference voltage.
2. The method for driving a liquid crystal display panel according to claim 1, wherein the liquid crystal display panel is a transparent display panel.
3. A driving circuit of a liquid crystal display panel, comprising:
a common electrode driving unit for transmitting a common electrode signal to a common electrode line of the liquid crystal display panel to invert a common voltage signal passing through the common electrode line between a first common voltage and a second common voltage in units of K frames, the first common voltage and the second common voltage having opposite polarities with respect to a reference voltage, K being an integer greater than 1; the liquid crystal display panel comprises M light sources with different colors, and K is equal to M;
the data driving unit is used for inputting a first gray scale voltage to the pixel electrode of the pixel unit when the common electrode signal sent to the common electrode line is a first common voltage; when a common electrode signal sent to the common electrode line is a second common voltage, inputting a second gray scale voltage to a pixel electrode of a pixel unit, wherein the polarity of the first gray scale voltage relative to the first common voltage is opposite to the polarity of the second gray scale voltage relative to the second common voltage;
the pixel unit comprises a first frame pixel, a second frame pixel and a third frame pixel which are different in color, and when a common electrode signal sent to the common electrode line is a first common voltage, the gray scale voltages input to the first frame pixel, the second frame pixel and the third frame pixel by the data driving unit are same in polarity relative to a reference voltage; when the common electrode signal sent to the common electrode line is a second common voltage, the gray scale voltages input to the first frame pixels, the second frame pixels and the third frame pixels by the data driving unit have the same polarity relative to a reference voltage.
4. A display device characterized by comprising the driving circuit of the liquid crystal display panel according to claim 3.
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