CN118197258A - Pre-charging method and liquid crystal display screen - Google Patents
Pre-charging method and liquid crystal display screen Download PDFInfo
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- CN118197258A CN118197258A CN202410409814.4A CN202410409814A CN118197258A CN 118197258 A CN118197258 A CN 118197258A CN 202410409814 A CN202410409814 A CN 202410409814A CN 118197258 A CN118197258 A CN 118197258A
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Abstract
The invention discloses a precharge method and a liquid crystal display screen, wherein the method comprises the following steps: the liquid crystal display comprises a control unit and a timing unit, wherein the timing unit is used for outputting grid driving timing of the liquid crystal display according to a control instruction; providing a first grid driving time sequence for all pixels of the liquid crystal display screen by using a time sequence unit, and carrying out 3H charging on the pixels so as to carry out point inversion; wherein, 3H charges as: the first H unit time, the second H unit time, the third H unit time and the actual charging are performed after the second H unit time, and the second H unit time and the third H unit time are separated by 1H unit time. The 3H charging is provided for the pixels of the liquid crystal display screen row by row for dot inversion, so that the voltage difference during pixel charging is effectively reduced, the charging rate is improved, and the display quality is improved.
Description
Technical Field
The invention relates to the technical field of display screens, in particular to a pre-charging method and a liquid crystal display screen.
Background
The flicker problem of the conventional liquid crystal display can be solved by spatial fusion of the optical corresponding waveforms of the adjacent pixels, which requires that the driving voltages of the adjacent pixels keep opposite polarities. A large number of driving methods with opposite polarities of adjacent pixels can be realized, and there are various modes such as dot inversion, column inversion, and row inversion. When a picture is displayed, the pixel voltage Vp applied across the liquid crystal has two polarities, and when the signal voltage Vp on the pixel electrode is greater than the COM electrode voltage Vcom, it is called positive polarity, and vice versa. As long as the absolute value of the pixel voltage Vp at both ends of the liquid crystal is the same, the gray-scale picture with the same brightness can be displayed.
In the same frame, each point (sub-pixel) and four points (sub-pixels) adjacent to the point (sub-pixel) are kept with opposite polarities, and the driving mode is called point inversion, and in the next frame, the voltage polarities of all the sub-pixels are simultaneously inverted, and the adjacent sub-pixels continue to keep with opposite polarities. The point inversion mode is the most delicate on the space fusion of the flicker, and is refined to each sub-pixel, so that the optimal flicker suppression effect is achieved. However, the existing liquid crystal display screen adopts a 4H charging technology, so that the problem of insufficient charging rate exists in a dot inversion mode, and the display quality is reduced.
Disclosure of Invention
The existing liquid crystal display screen has the problem of insufficient charging rate when dot inversion is adopted, and the display quality is reduced.
Aiming at the problems, a pre-charging method and a liquid crystal display are provided, 3H charging is provided for pixels of the liquid crystal display line by line to perform point inversion, namely, pre-charging is performed for only two H unit time, and actual charging is performed for one H unit time, so that voltage difference during pixel charging is effectively reduced, charging rate is improved, and display quality is improved.
In a first aspect, a method of pre-charging includes:
Step 100, providing a liquid crystal display screen, wherein the liquid crystal display screen comprises a control unit and a timing unit, and the timing unit is used for outputting a grid driving timing sequence of the liquid crystal display screen according to a control instruction;
step 200, providing a first grid driving time sequence for all pixels of the liquid crystal display screen by using the time sequence unit, and carrying out 3H charging on the pixels so as to carry out point inversion;
Wherein, 3H charges as: the first H unit time, the second H unit time, the third H unit time and the actual charging are performed after the second H unit time, and the second H unit time and the third H unit time are separated by 1H unit time.
In combination with the precharge method according to the first aspect of the present invention, in a first possible implementation manner, the step 200 includes:
step 210, sequentially providing the first gate driving time sequence for the pixels of the liquid crystal display screen in the current frame time to start gate driving;
Step 220, performing a first 3H charging to the pixel in a unit time of the high level pulse of the first gate driving timing, so that the voltage polarity of the pixel is opposite to the voltage polarity of the adjacent pixel.
With reference to the first possible implementation manner of the first aspect of the present invention, in a second possible implementation manner, the step 200 further includes:
Step 230, providing the first gate driving timing sequence to the pixels of the liquid crystal display screen in the next frame time sequence to turn on the gate driving;
Step 240, performing a second 3H charge on the pixels in a unit time of the high level pulse of the first gate driving timing, so that voltage polarities of all pixels are reversed.
In combination with the precharge method according to the first aspect of the present invention, in a third possible implementation manner, the step 200 further includes:
step 250, pre-charging positive polarity voltage in the first H unit time, and pre-charging negative polarity voltage in the second H unit time;
step 260, after the second H unit time, performing a low level of one H unit time;
Step 270, actually charging negative polarity voltage in the third H unit time.
In combination with the precharge method according to the first aspect of the present invention, in a third possible implementation manner, the step 200 further includes:
Step 280, pre-charging a negative polarity voltage in the first H unit time, and pre-charging a positive polarity voltage in the second H unit time;
Step 290, performing a low level of H unit time after the second H unit time;
Step 291, actually charging a positive polarity voltage in the third H unit time.
In a second aspect, a liquid crystal display panel, employing the precharge method of the first aspect, includes:
A control unit;
A timing unit;
the time sequence unit is used for providing a first grid driving time sequence for all pixels of the liquid crystal display screen according to a control instruction to charge the pixels in 3H so as to perform point overturning;
Wherein, 3H charges as: the first H unit time, the second H unit time, the third H unit time and the actual charging are performed after the second H unit time, and the second H unit time and the third H unit time are separated by 1H unit time.
With reference to the liquid crystal display according to the second aspect of the present invention, in a first possible implementation manner, the timing unit is further configured to:
Sequentially providing the first grid driving time sequence for pixels of the liquid crystal display screen in the current frame time so as to start grid driving;
and in the unit time of the high-level pulse of the first grid driving time sequence, the pixel is charged with a first 3H so that the voltage polarity of the pixel is opposite to the voltage polarity of the adjacent pixel.
With reference to the liquid crystal display according to the second aspect of the present invention, in a second possible implementation manner, the timing unit is further configured to:
providing the first gate driving timing sequence to the pixels of the liquid crystal display screen in the next frame time sequence to start gate driving;
And in the unit time of the high-level pulse of the first grid driving time sequence, the second 3H charge is carried out on the pixels, so that the voltage polarities of all the pixels are reversed.
In combination with the liquid crystal display according to the second aspect of the present invention, in a third possible implementation manner, the timing unit is further configured to:
pre-charging a positive polarity voltage for the first H unit time, and pre-charging a negative polarity voltage for the second H unit time;
After the second H unit time, performing a low level of H unit time;
And actually charging the negative polarity voltage in the third H unit time.
With reference to the liquid crystal display according to the second aspect of the present invention, in a fourth possible implementation manner, the timing unit is further configured to:
pre-charging a negative polarity voltage at the first H unit time, and pre-charging a positive polarity voltage at the second H unit time;
After the second H unit time, performing a low level of H unit time;
And actually charging a positive polarity voltage in the third H unit time.
By implementing the precharge method and the liquid crystal display, 3H charge is provided for pixels of the liquid crystal display line by line to perform dot inversion, namely, only two H unit time precharge and one H unit time actual charge are performed, so that the voltage difference during pixel charge is effectively reduced, the charging rate is improved, and the display quality is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of dot inversion pixel polarity;
FIG. 2 is a schematic diagram of a conventional gate driving timing sequence;
FIG. 3 is a schematic diagram of a first gate driving timing diagram according to the present invention;
FIG. 4 is a first schematic diagram of the precharge method in embodiment 1;
FIG. 5 is a second schematic diagram of the precharge method in embodiment 1;
FIG. 6 is a third schematic diagram of the precharge method in embodiment 1;
FIG. 7 is a fourth schematic diagram of the precharge method in embodiment 1;
fig. 8 is a fifth schematic diagram of the precharge method in embodiment 1;
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. Based on the embodiments of the present invention, other embodiments that may be obtained by those of ordinary skill in the art without undue burden are within the scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The existing liquid crystal display screen has the problem of insufficient charging rate when dot inversion is adopted, and the display quality is reduced.
In order to solve the above problems, a precharge method and a liquid crystal display are provided.
Example 1
In a first aspect, as shown in fig. 4, fig. 4 is a first schematic diagram of a precharge method in embodiment 1; a method of pre-charging, comprising:
step 100, providing a liquid crystal display screen, wherein the liquid crystal display screen comprises a control unit and a timing unit, and the timing unit is used for outputting a grid driving timing sequence of the liquid crystal display screen according to a control instruction;
Step 200, providing a first grid driving time sequence for all pixels of a liquid crystal display screen by using a time sequence unit, and carrying out 3H charging on the pixels so as to carry out point inversion; wherein, 3H charges as: the first H unit time, the second H unit time, the third H unit time and the actual charging are performed after the second H unit time, and the second H unit time and the third H unit time are separated by 1H unit time.
The dot inversion mode of the liquid crystal display screen is that the polarity of the pixel voltage around a certain pixel point is opposite to the polarity of the voltage of the pixel point.
Preferably, as shown in fig. 5, fig. 5 is a second schematic diagram of the precharge method in embodiment 1; step 200 comprises: step 210, sequentially providing a first gate driving time sequence for pixels of the liquid crystal display screen in the current frame time to start gate driving; step 220, in a unit time of the high level pulse of the first gate driving timing, the pixel is charged by the first 3H so that the voltage polarity of the pixel is opposite to the voltage polarity of the adjacent pixel.
Preferably, as shown in fig. 6, fig. 6 is a third schematic diagram of the precharge method in embodiment 1; step 200 further comprises: step 230, providing a first gate driving timing sequence to the pixels of the liquid crystal display screen in the next frame time sequence to turn on the gate driving; step 240, in a unit time of the high level pulse of the first gate driving timing, performing the second 3H charging to the pixels, so that the voltage polarities of all the pixels are reversed.
The dot inversion is that the voltage polarity of each pixel of the same frame picture is opposite to the voltage polarity of the adjacent pixels, and the voltage polarities of the pixels of different frame pictures are inverted.
When the 4H charge is used for driving the pixel, the 3H precharge is performed, that is, the 3H precharge is performed first, and the 1H charge is actually performed in a true sense. As shown in fig. 2, fig. 2 is a schematic diagram of a conventional gate driving timing, such as the gate driving timing in fig. 2, in which the first H unit time of the high level pulse is precharged with the positive polarity voltage, the second H unit time is precharged with the negative polarity voltage, the third H unit time is precharged with the positive polarity voltage, the fourth H unit time is actually charged with the negative polarity voltage, if the voltage is charged from +5v to-5V, there is a 10V voltage difference in between, and in the conventional timing state, there is a shortage of charge, resulting in poor display quality.
In this embodiment, as shown in fig. 7, fig. 7 is a fourth schematic diagram of the precharge method in embodiment 1; the precharge step 200 of one pixel may include:
Step 250, pre-charging positive polarity voltage in a first H unit time, and pre-charging negative polarity voltage in a second H unit time; step 260, after the second H unit time, performing a low level of H unit time; step 270, actually charging negative polarity voltage in the third H unit time.
In this embodiment, as shown in fig. 8, fig. 8 is a first schematic diagram of the precharge method in embodiment 1; the precharge step 200 of another pixel may also include:
280, pre-charging negative polarity voltage in a first H unit time, and pre-charging positive polarity voltage in a second H unit time; step 290, after the second H unit time, performing a low level of H unit time; step 291, actually charges the positive polarity voltage in the third H unit time.
Fig. 3 is a schematic diagram of a first gate driving timing diagram according to the present invention; as shown in the first driving timing sequence in fig. 3, 3H charging is adopted, that is, the first H unit time and the second H unit time are used for pre-charging, the third H unit time is used for actual charging, 1H unit time is separated between the second H unit time and the third H unit time, and in the separated H unit time, the timing sequence is at a low level, that is, the pre-charging of the pixel is closed in the H unit time, so that the voltage difference in charging of the pixel is reduced, and the charging rate is improved.
The first grid driving time sequence charges positive voltage in the first H unit time, charges negative voltage in the second H unit time, the grid electrode in the interval H unit time changes to be low level, namely the grid electrode signal is in an off state at the moment, namely positive voltage data in the H unit time at the moment cannot be charged into the pixel, when the third H unit time arrives at the negative voltage, the grid electrode is started again, the voltage of the negative voltage is charged on the basis of the negative voltage in the second H unit time, if the voltage is charged from-5V to 0V, the voltage difference is at most 5V, the charging rate is improved greatly, and therefore compared with the existing pre-charging technology, the display effect is improved well. And the like, the whole screen is charged. The 3H charging is provided for the pixels of the liquid crystal display screen row by row to perform point inversion, namely, only two H unit time precharging is performed, and one H unit time actual charging is performed, so that the voltage difference during pixel charging is effectively reduced, the charging rate is improved, and the display quality is improved.
Example 2
In a second aspect, a liquid crystal display panel, which adopts the precharge method of the first aspect, includes a control unit and a timing unit; the time sequence unit is used for providing a first grid driving time sequence for all pixels of the liquid crystal display screen according to the control instruction to charge the pixels for 3H so as to perform point turnover; wherein, 3H charges as: the first H unit time, the second H unit time, the third H unit time and the actual charging are performed after the second H unit time, and the second H unit time and the third H unit time are separated by 1H unit time.
Further, the timing unit is further configured to:
Sequentially providing a first grid driving time sequence for pixels of the liquid crystal display screen in the current frame time so as to start grid driving; the first 3H charge is performed to the pixel such that the voltage polarity of the pixel is opposite to the voltage polarity of its neighboring pixels in a unit time of the high level pulse of the first gate driving timing.
Further, the timing unit is further configured to:
And providing a first grid driving time sequence for the pixels of the liquid crystal display screen in the next frame time sequence so as to start grid driving, and carrying out second 3H charging on the pixels in the unit time of high-level pulses of the first grid driving time sequence so as to enable the voltage polarities of all the pixels to be reversed.
Further, the timing unit is further configured to:
The positive polarity voltage is precharged for a first H unit time, the negative polarity voltage is precharged for a second H unit time, a low level is performed for one H unit time after the second H unit time, and the negative polarity voltage is actually precharged for a third H unit time.
Further, the timing unit is further configured to:
The negative polarity voltage is precharged for the first H unit time, the positive polarity voltage is precharged for the second H unit time, the low level for one H unit time is performed after the second H unit time, and the positive polarity voltage is actually precharged for the third H unit time.
By implementing the precharge method and the liquid crystal display, 3H charge is provided for pixels of the liquid crystal display line by line to perform dot inversion, namely, only two H unit time precharge and one H unit time actual charge are performed, so that the voltage difference during pixel charge is effectively reduced, the charging rate is improved, and the display quality is improved.
The foregoing is only illustrative of the present invention and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present invention.
Claims (10)
1. A method of precharging comprising:
Step 100, providing a liquid crystal display screen, wherein the liquid crystal display screen comprises a control unit and a timing unit, and the timing unit is used for outputting a grid driving timing sequence of the liquid crystal display screen according to a control instruction;
step 200, providing a first grid driving time sequence for all pixels of the liquid crystal display screen by using the time sequence unit, and carrying out 3H charging on the pixels so as to carry out point inversion;
Wherein, 3H charges as: the first H unit time, the second H unit time, the third H unit time and the actual charging are performed after the second H unit time, and the second H unit time and the third H unit time are separated by 1H unit time.
2. The method of pre-charging as set forth in claim 1, wherein the step 200 includes:
step 210, sequentially providing the first gate driving time sequence for the pixels of the liquid crystal display screen in the current frame time to start gate driving;
Step 220, performing a first 3H charging to the pixel in a unit time of the high level pulse of the first gate driving timing, so that the voltage polarity of the pixel is opposite to the voltage polarity of the adjacent pixel.
3. The method of pre-charging of claim 2, wherein the step 200 further comprises:
Step 230, providing the first gate driving timing sequence to the pixels of the liquid crystal display screen in the next frame time sequence to turn on the gate driving;
Step 240, performing a second 3H charge on the pixels in a unit time of the high level pulse of the first gate driving timing, so that voltage polarities of all pixels are reversed.
4. The method of claim 1, wherein the step 200 further comprises:
step 250, pre-charging positive polarity voltage in the first H unit time, and pre-charging negative polarity voltage in the second H unit time;
step 260, after the second H unit time, performing a low level of one H unit time;
Step 270, actually charging negative polarity voltage in the third H unit time.
5. The method of claim 1, wherein the step 200 further comprises:
Step 280, pre-charging a negative polarity voltage in the first H unit time, and pre-charging a positive polarity voltage in the second H unit time;
Step 290, performing a low level of H unit time after the second H unit time;
Step 291, actually charging a positive polarity voltage in the third H unit time.
6. A liquid crystal display panel employing the precharge method according to any one of claims 1 to 5, comprising:
A control unit;
A timing unit;
the time sequence unit is used for providing a first grid driving time sequence for all pixels of the liquid crystal display screen according to a control instruction to charge the pixels in 3H so as to perform point overturning;
Wherein, 3H charges as: the first H unit time, the second H unit time, the third H unit time and the actual charging are performed after the second H unit time, and the second H unit time and the third H unit time are separated by 1H unit time.
7. The liquid crystal display of claim 6, wherein the timing unit is further configured to:
Sequentially providing the first grid driving time sequence for pixels of the liquid crystal display screen in the current frame time so as to start grid driving;
and in the unit time of the high-level pulse of the first grid driving time sequence, the pixel is charged with a first 3H so that the voltage polarity of the pixel is opposite to the voltage polarity of the adjacent pixel.
8. The liquid crystal display of claim 6, wherein the timing unit is further configured to:
providing the first gate driving timing sequence to the pixels of the liquid crystal display screen in the next frame time sequence to start gate driving;
And in the unit time of the high-level pulse of the first grid driving time sequence, the second 3H charge is carried out on the pixels, so that the voltage polarities of all the pixels are reversed.
9. The liquid crystal display of claim 6, wherein the timing unit is further configured to:
pre-charging a positive polarity voltage for the first H unit time, and pre-charging a negative polarity voltage for the second H unit time;
After the second H unit time, performing a low level of H unit time;
And actually charging the negative polarity voltage in the third H unit time.
10. The liquid crystal display of claim 6, wherein the timing unit is further configured to:
pre-charging a negative polarity voltage at the first H unit time, and pre-charging a positive polarity voltage at the second H unit time;
After the second H unit time, performing a low level of H unit time;
And actually charging a positive polarity voltage in the third H unit time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410409814.4A CN118197258A (en) | 2024-04-07 | 2024-04-07 | Pre-charging method and liquid crystal display screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410409814.4A CN118197258A (en) | 2024-04-07 | 2024-04-07 | Pre-charging method and liquid crystal display screen |
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| CN118197258A true CN118197258A (en) | 2024-06-14 |
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| CN202410409814.4A Pending CN118197258A (en) | 2024-04-07 | 2024-04-07 | Pre-charging method and liquid crystal display screen |
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