CN107564489B - Driving method of liquid crystal display device - Google Patents
Driving method of liquid crystal display device Download PDFInfo
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- CN107564489B CN107564489B CN201710943091.6A CN201710943091A CN107564489B CN 107564489 B CN107564489 B CN 107564489B CN 201710943091 A CN201710943091 A CN 201710943091A CN 107564489 B CN107564489 B CN 107564489B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000010409 thin film Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 230000000630 rising effect Effects 0.000 claims description 4
- 235000019557 luminance Nutrition 0.000 description 6
- 239000000758 substrate Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000010287 polarization Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000002834 transmittance Methods 0.000 description 1
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Abstract
The invention provides a driving method of a liquid crystal display device. The method utilizes a time schedule controller to judge the relation of the brightness to be displayed of two adjacent lines of pixels according to an initial data signal and generates a corresponding control signal to a source electrode driver, when the brightness to be displayed of the pixels in two adjacent rows is the same or the brightness to be displayed of the pixels in the previous row is smaller than the brightness to be displayed of the pixels in the next row, the source driver charge-shares the voltages on the adjacent two data lines in a period of the first high level of the line latch signal after the change of the inversion signal level, when the brightness to be displayed of the pixels in the previous row is greater than the brightness to be displayed of the pixels in the next row, the source driver shares the charges of the voltages on the two adjacent data lines in each high-level period of the row latch signal, therefore, in the period of time when the level of the inversion signal is not changed, the charge sharing is only carried out when the picture of the two adjacent rows of pixels is changed from white to black, and the power consumption and the temperature of the source driver are effectively reduced.
Description
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a driving method of a liquid crystal display device.
Background
Liquid Crystal Displays (LCDs) have many advantages such as thin body, power saving, no radiation, and the like, and are widely used. Such as: liquid crystal televisions, mobile phones, Personal Digital Assistants (PDAs), digital cameras, computer screens, notebook computer screens, or the like, are dominant in the field of flat panel displays.
Most of the existing liquid crystal displays in the market are backlight liquid crystal displays (lcds), which include a liquid crystal panel and a backlight module (backlight module). The liquid crystal panel operates on the principle that liquid crystal molecules are filled between a Thin film transistor Array Substrate (TFT Array Substrate) and a Color Filter Substrate (Color Filter, CF), and driving voltages are applied to the two substrates to control the rotation direction of the liquid crystal molecules, so that light rays of the backlight module are refracted out to generate a picture.
In the active liquid crystal panel, each pixel includes a Thin Film Transistor (TFT), a Gate (Gate) of the TFT is connected to a horizontal scan line, a Source (Source) is connected to a vertical data line, and a Drain (Drain) is connected to a pixel electrode. In the prior art, a plurality of data lines of the liquid crystal panel are connected to a Source Driver (Source Driver), and a signal voltage is input to each data line by using the Source Driver, so that after sufficient voltage is applied to a horizontal scanning line to turn on all TFTs electrically connected to the horizontal scanning line, the signal voltage on the data line can be written into a pixel, and the transmittance of different liquid crystals is controlled, thereby achieving the effect of controlling color and brightness.
In the prior art, to prevent liquid crystal molecules from being polarized under the action of an electric field in the same direction for a long time, a driving mode of applying a positive and negative alternating electric field to a liquid crystal layer, that is, an inversion driving mode, is generally adopted to periodically change the deflection direction of the liquid crystal molecules, thereby avoiding the occurrence of polarization phenomenon. The inversion driving mainly includes Frame inversion (Frame inversion), Column inversion (Column inversion), Dot inversion (Dot inversion), and the like. In the column inversion method, the polarities of the pixels in the same column are the same, and the polarities of the pixels in adjacent columns are opposite. Meanwhile, in the prior art, a Timing Controller (TCON) generally receives a Low Voltage Differential Signaling (LVDS) signal and transmits a corresponding data signal to a source driver, and outputs a reverse signal (POL) and a line latch signal (TP) to the source driver, where the reverse signal is a pulse signal, and generally changes a level once within a time period of one frame, the source driver inverts a polarity of a signal voltage output by the source driver after the level of the reverse signal changes, so as to prevent liquid crystal polarization, and the line latch signal is a pulse signal, the source driver latches the data signal when a rising edge of the line latch signal comes, and outputs a signal voltage corresponding to the latched data signal to a data line after a falling edge of the line latch signal comes, and the signal voltage is input to each pixel row by matching with TFTs that are turned on row by row, thereby implementing driving of a liquid crystal panel.
In order to prevent the signal voltage from changing too much in a short time, in a liquid crystal display device using column inversion driving, a conventional technique is to transmit a first control signal and a second control signal to a source driver through a timing controller, and control the source driver to perform charge sharing (charge sharing) on voltages on adjacent data lines, and there are two types of charge sharing methods: in the first charge sharing mode, the timing controller transmits a first control signal with a low level and a second control signal with a high level to the source driver, so that the source driver performs charge sharing on voltages on the 2n and 2n-1 data lines in a first high-level period of the line latch signal after the level of the inversion signal changes, and then the source driver drives the voltages on the data lines to signal voltages corresponding to the latched data signals when a first falling edge of the line latch signal comes; in the second charge sharing mode, the timing controller transmits a first control signal with a high level and a second control signal with a low level to the source driver, so that the source driver shares charges with the voltages on the 2n and 2n-1 data lines in each high-level period of the row latch signal, and then drives the voltages on the data lines to the signal voltages corresponding to the latched data signals when the falling edge of the row latch signal arrives. In the first charge sharing mode, the power consumption of the source driver is the largest and the temperature is the highest when the liquid crystal display device displays a picture which is alternately bright and dark line by line, and in the second charge sharing mode, the power consumption of the source driver is the largest and the temperature is the highest when the liquid crystal display device displays a white picture. The power consumption and the temperature of the source driver are too high to limit the liquid crystal display device to be developed to a larger size and a higher frequency.
Disclosure of Invention
The invention aims to provide a driving method of a liquid crystal display device, which can reduce the power consumption of a source driver of the liquid crystal display device, reduce the heat productivity of the source driver and is beneficial to realizing large size and high frequency of the liquid crystal display device.
In order to achieve the above object, the present invention provides a driving method of a liquid crystal display device, comprising the steps of:
step S1, providing a liquid crystal display device; the liquid crystal display device includes: the liquid crystal display panel comprises a time schedule controller, a source electrode driver and a liquid crystal panel, wherein the source electrode driver is electrically connected with the time schedule controller; the liquid crystal panel comprises a plurality of pixels arranged in an array, a plurality of data lines correspondingly connected with the plurality of columns of pixels, and a plurality of scanning lines correspondingly connected with the plurality of rows of pixels, wherein the plurality of data lines are electrically connected with the source driver;
step S2, inputting an initial data signal to the timing controller;
step S3, converting the initial data signal into a conversion data signal by the time schedule controller, judging the relation of brightness to be displayed of two adjacent lines of pixels according to the initial data signal to generate a corresponding control signal, and outputting the conversion data signal, the inversion signal, the line latch signal and the control signal to a source driver;
step S4, the source driver outputs signal voltages to the data lines according to the converted data signal, the inversion signal, the column latch signal, and the control signal, and performs column inversion driving on the liquid crystal panel;
when the brightness to be displayed of the pixels in two adjacent rows is the same or the brightness to be displayed of the pixels in the previous row is smaller than the brightness to be displayed of the pixels in the next row, the source driver performs charge sharing on the voltages on the 2n and 2n-1 data lines in the first high-level period of the line latch signal after the level change of the inversion signal according to the control signal transmitted by the timing controller in step S4; when the brightness to be displayed of the front row of pixels is greater than the brightness to be displayed of the back row of pixels, the source driver shares the charges of the voltages on the 2 n-th and 2n-1 data lines in each high-level period of the row latch signal according to the control signal transmitted by the timing controller.
The source driver latches a conversion data signal input thereto at the time of a rising edge of the row latch signal, and drives a voltage on the data line to a signal voltage corresponding to the latched conversion data signal after a falling edge of the row latch signal comes.
The control signal comprises a first control signal and a second control signal;
when the brightness to be displayed of two adjacent rows of pixels is the same or the brightness to be displayed of the previous row of pixels is smaller than the brightness to be displayed of the next row of pixels, the time sequence controller outputs a first control signal with low level and a second control signal with high level to the source electrode driver;
when the brightness to be displayed of the front row of pixels is greater than the brightness to be displayed of the back row of pixels, the time sequence controller outputs a first control signal with a high level and a second control signal with a low level to the source electrode driver.
The liquid crystal display device further comprises a gate driver;
the plurality of scanning lines are electrically connected with the grid driver.
In the step S3, the timing controller obtains the gray scale of the brightness to be displayed of the two adjacent rows of pixels according to the initial data signal, and determines the relationship between the brightness to be displayed of the two adjacent rows of pixels according to the gray scale.
The initial data signal is an LVDS signal.
The converted data signal is a mini-LVDS signal.
Each pixel comprises a thin film transistor and a pixel electrode; the grid electrode of the thin film transistor is electrically connected with the corresponding scanning line, the source electrode of the thin film transistor is electrically connected with the corresponding data line, and the drain electrode of the thin film transistor is electrically connected with the pixel electrode in the pixel where the thin film transistor is located.
The invention has the beneficial effects that: the invention provides a driving method of a liquid crystal display device, which utilizes a time schedule controller to judge the relation of the brightness to be displayed of two adjacent lines of pixels according to an initial data signal to generate a corresponding control signal to a source driver, so that when the brightness to be displayed of two adjacent lines of pixels is the same or the brightness to be displayed of a previous line of pixels is less than the brightness to be displayed of a next line of pixels, the source driver shares the charges of the voltages of two adjacent data lines in the period of the first high level of a line latching signal after the level of an inversion signal is changed, when the brightness to be displayed of the previous line of pixels is more than the brightness to be displayed of the next line of pixels, the source driver shares the charges of the voltages of two adjacent data lines in each period of the high level of the line latching signal, thereby the charges are shared only when the picture of the two adjacent lines of pixels is changed from white to black in the period of the level, the power consumption and the temperature of the source electrode driver are effectively reduced.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a flow chart of a driving method of a liquid crystal display device according to the present invention;
FIG. 2 is a diagram illustrating a step S1 of the driving method of the LCD device according to the present invention;
fig. 3 is a timing chart of the inversion signal level invariant period in step S4 of the driving method of the liquid crystal display device according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 1, the present invention provides a driving method of a liquid crystal display device, including the steps of:
step S1, please refer to fig. 1, providing a liquid crystal display device; the liquid crystal display device includes: a timing controller 100, a source driver 200 electrically connected to the timing controller 100, and a liquid crystal panel 300 electrically connected to the source driver 200; the liquid crystal panel 300 includes a plurality of pixels 310 arranged in an array, a plurality of data lines 320 correspondingly connected to the plurality of columns of pixels 310, and a plurality of scan lines 330 correspondingly connected to the plurality of columns of pixels 310, wherein the plurality of data lines 320 are electrically connected to the source driver 200.
Specifically, the liquid crystal display device further includes a gate driver 400; the scan lines 330 are electrically connected to the gate driver 400.
Specifically, each pixel 310 includes a thin film transistor T and a pixel electrode 311; the gate of the thin film transistor T is electrically connected to the corresponding scan line 330, the source is electrically connected to the corresponding data line 320, and the drain is electrically connected to the pixel electrode 311 of the pixel 310.
Step S2, inputting an initial data signal to the timing controller 100.
Specifically, the initial data signal is an LDVS signal.
In step S3, please refer to fig. 3, the timing controller 100 converts the initial data signal into a converted data signal, determines the relationship between the brightness to be displayed of two adjacent rows of pixels 310 according to the initial data signal to generate a corresponding control signal, and outputs the converted data signal, the inversion signal POL, the line latch signal TP, and the control signal to the source driver 200.
Specifically, the converted data signal is a micro-low voltage differential (mini-LDVS) signal.
Specifically, in the step S3, the timing controller 100 obtains the gray scale of the brightness to be displayed of the two adjacent rows of pixels 310 according to the initial data signal, and determines the relationship between the brightness to be displayed of the two adjacent rows of pixels 310 according to the gray scale. Further, in the step S3, the timing controller 100 stores the initial data signals corresponding to the pixels in the previous row of the pixels 310 in the two adjacent rows after receiving the initial data signals corresponding to the pixels in the next row of the pixels 310, and then obtains the relationship between the brightness to be displayed of the pixels 310 in the two adjacent rows according to the initial data signals corresponding to the pixels 310 in the next row.
In particular, the control signals include a first control signal LP1 and a second control signal LP 2; when the brightness to be displayed by two adjacent rows of pixels 310 is the same or the brightness to be displayed by the previous row of pixels 310 is less than the brightness to be displayed by the next row of pixels 310, the timing controller 100 outputs the first control signal LP1 with low level and the second control signal LP2 with high level to the source driver 200;
when the brightness to be displayed by the previous row of pixels 310 is greater than the brightness to be displayed by the next row of pixels 310, the timing controller 100 outputs the first control signal LP1 with a high level and the second control signal LP2 with a low level to the source driver 200.
Specifically, the inversion signal POL is a pulse signal used in the related art to control the source driver 200 to invert the polarity of the signal voltage output therefrom. Preferably, the high level time and the low level time of the inversion signal POL are both equal to each other in one frame duration of the liquid crystal panel 300, that is, the level of the inversion signal POL in the same frame is kept unchanged, and the levels of the inversion signal POL in two adjacent frames are different.
Specifically, the line latch signal TP is a pulse signal used to control the source driver 200 to output a corresponding signal voltage according to the converted data signal in the prior art. After the rising edge of the row latch signal TP comes, the source driver 200 latches the conversion data signal input thereto at that time, and drives the voltage on the data line to a signal voltage corresponding to the latched conversion data signal after the falling edge of the latch signal TP comes.
In step S4, the source driver 200 outputs signal voltages to the data lines 320 according to the converted data signal, the inversion signal POL, the row latch signal TP, and the control signal, so as to perform column inversion driving on the liquid crystal panel 300, that is, the same polarity is applied to the pixels 310 in the same column, and the polarities of the pixels 310 in two adjacent columns are opposite.
It is important to note that, in the step S4, when the brightness to be displayed by two adjacent rows of pixels 310 is the same or the brightness to be displayed by the previous row of pixels 310 is less than the brightness to be displayed by the next row of pixels 310, the timing controller 100 outputs the first control signal LP1 with low level and the second control signal LP2 with high level to the source driver 200, and after the source driver 200 receives the first control signal LP1 with low level and the second control signal LP2 with high level, the source driver starts the operation mode of performing charge sharing only when the level of the inversion signal POL changes and the line latch signal TP is at high level, specifically, the voltage V on the 2 n-th and 2n-1 data lines 320 is applied only in the first high level period of the line latch signal TP after the level of the inversion signal POL changes2n、V2n-1Charge sharing is performed, and the voltage V on the 2 n-th and 2n-1 data lines 320 is constant when the level of the inversion signal POL is constant2n、V2n-1No charge sharing is performed; when the brightness to be displayed by the previous row of pixels 310 is greater than the brightness to be displayed by the next row of pixels 310, the timing controller 100 outputs the first control signal LP1 with a high level and the second control signal LP2 with a low level to the source driver 200, and after the source driver 200 receives the first control signal LP1 with a high level and the second control signal LP2 with a low level, the source driver 200 starts the charge sharing mode when the row latch signal TP is at a high level, specifically, the voltages V on the 2n and 2n-1 data lines 320 are set to be equal in each high level period of the row latch signal TP2n、V2n-1Referring to fig. 3, in a period of time when the level of the inversion signal POL is not changed, the present invention only performs charge sharing when the frames of two adjacent rows of pixels 310 change from white to black, so that the power consumption of the source driver is reduced by approximately half, and the problem of temperature rise due to excessive power consumption of the source driver is prevented.
In summary, the driving method of the liquid crystal display device of the present invention utilizes the timing controller to determine the relationship between the luminances to be displayed of the two adjacent rows of pixels according to the initial data signal and generate the corresponding control signal to the source driver, so that when the luminances to be displayed of the two adjacent rows of pixels are the same or the luminance to be displayed of the previous row of pixels is less than the luminance to be displayed of the next row of pixels, the source driver performs charge sharing on the voltages of the two adjacent data lines during the first high level period of the line latch signal after the level of the inversion signal changes, and when the luminance to be displayed of the previous row of pixels is greater than the luminance to be displayed of the next row of pixels, the source driver performs charge sharing on the voltages of the two adjacent data lines during each high level period of the line latch signal, so that the charge sharing is performed only when the frames of the two adjacent rows of pixels change from white to black during the, the power consumption and the temperature of the source electrode driver are effectively reduced.
As described above, it will be apparent to those skilled in the art that various other changes and modifications can be made based on the technical solution and the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the appended claims.
Claims (8)
1. A method for driving a liquid crystal display device, comprising the steps of:
step S1, providing a liquid crystal display device; the liquid crystal display device includes: the liquid crystal display panel comprises a time schedule controller (100), a source driver (200) electrically connected with the time schedule controller (100), and a liquid crystal panel (300) electrically connected with the source driver (200); the liquid crystal panel (300) comprises a plurality of pixels (310) arranged in an array, a plurality of data lines (320) correspondingly connected with the plurality of columns of pixels (310), and a plurality of scanning lines (330) correspondingly connected with the plurality of rows of pixels (310), wherein the plurality of data lines (320) are electrically connected with the source driver (200);
step S2, inputting an initial data signal to the timing controller (100);
step S3, converting the initial data signal into a conversion data signal by the time schedule controller (100), judging the relation of the brightness to be displayed of two adjacent lines of pixels (310) according to the initial data signal to generate a corresponding control signal, and outputting the conversion data signal, the inversion signal (POL), the line latch signal (TP) and the control signal to a source driver (200);
step S4, the source driver (200) outputs signal voltages to the plurality of data lines (320) according to the conversion data signal, the inversion signal (POL), the line latch signal (TP), and the control signal, and performs column inversion driving on the liquid crystal panel (300);
when the brightness to be displayed of the pixels (310) in two adjacent rows is the same or the brightness to be displayed of the pixels (310) in the previous row is smaller than the brightness to be displayed of the pixels (310) in the next row, the source driver (200) performs charge sharing on the voltages on the 2 n-th and 2n-1 data lines (320) in a period of the first high level of the line latch signal (TP) after the level of the inversion signal (POL) is changed according to the control signal transmitted by the timing controller (100) in the step S4; when the brightness to be displayed of the pixels (310) in the previous row is greater than the brightness to be displayed of the pixels (310) in the next row, the source driver (200) shares the charges of the voltages on the 2n and 2n-1 data lines (320) in each high-level period of the row latch signal (TP) according to the control signal transmitted by the timing controller (100).
2. The method of driving a liquid crystal display device according to claim 1, wherein the source driver (200) latches a conversion data signal inputted thereto at the time of a rising edge of the row latch signal (TP), and drives the voltage on the data line (320) to a signal voltage corresponding to the latched conversion data signal after a falling edge of the row latch signal (TP) comes.
3. The method of driving a liquid crystal display device according to claim 1, wherein the control signal comprises a first control signal (LP1) and a second control signal (LP 2);
when the brightness to be displayed of the pixels (310) in two adjacent rows is the same or the brightness to be displayed of the pixels (310) in the previous row is smaller than the brightness to be displayed of the pixels (310) in the next row, the timing controller (100) outputs a first control signal (LP1) with a low level and a second control signal (LP2) with a high level to the source driver (200);
when the brightness to be displayed of the previous row of pixels (310) is greater than the brightness to be displayed of the next row of pixels (310), the timing controller (100) outputs a first control signal (LP1) with a high level and a second control signal (LP2) with a low level to the source driver (200).
4. The driving method of the liquid crystal display device according to claim 1, wherein the liquid crystal display device further comprises a gate driver (400);
the plurality of scanning lines (330) are all electrically connected with the gate driver (400).
5. The method as claimed in claim 1, wherein in step S3, the timing controller (100) obtains a gray scale of the brightness to be displayed of the pixels (310) in two adjacent rows according to the initial data signal, and determines the relationship between the brightness to be displayed of the pixels (310) in two adjacent rows according to the gray scale.
6. The method for driving a liquid crystal display device according to claim 1, wherein the initial data signal is an LVDS signal.
7. The method of driving a liquid crystal display device according to claim 6, wherein the converted data signal is a mini-LVDS signal.
8. The driving method of the liquid crystal display device according to claim 1, wherein each pixel (310) comprises a thin film transistor (T) and a pixel electrode (311); the grid electrode of the thin film transistor (T) is electrically connected with the corresponding scanning line (330), the source electrode is electrically connected with the corresponding data line (320), and the drain electrode is electrically connected with the pixel electrode (311) in the pixel (310) where the thin film transistor is positioned.
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| CN112509532B (en) * | 2020-12-08 | 2021-11-23 | 惠科股份有限公司 | Driving method and driving device of liquid crystal display panel and display device |
| CN112967693A (en) * | 2021-02-26 | 2021-06-15 | 北京集创北方科技股份有限公司 | Driving method and device, chip and electronic equipment |
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| CN101800036A (en) * | 2009-02-05 | 2010-08-11 | 联咏科技股份有限公司 | Method for driving liquid crystal display and related driving device thereof |
| TWI413968B (en) * | 2009-01-23 | 2013-11-01 | Novatek Microelectronics Corp | Method for driving a liquid crystal display monitor and related apparatus |
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| TWI413968B (en) * | 2009-01-23 | 2013-11-01 | Novatek Microelectronics Corp | Method for driving a liquid crystal display monitor and related apparatus |
| CN101800036A (en) * | 2009-02-05 | 2010-08-11 | 联咏科技股份有限公司 | Method for driving liquid crystal display and related driving device thereof |
| CN105513520A (en) * | 2014-10-13 | 2016-04-20 | 三星显示有限公司 | Method and system for driving display panel and display apparatus for performing method |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL China Star Optoelectronics Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |