A pre-charge method and liquid crystal display

Abstract

The application discloses a pre-charging method and a liquid crystal display screen. The method comprises the following steps: 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 gate driving timing sequence of the liquid crystal display screen according to a control instruction; and providing a first gate driving timing sequence to all pixels of the liquid crystal display screen by using the timing unit to perform 3H charging on the pixels to perform point flipping. The 3H charging is pre-charging in a first H unit time and a second H unit time, actual charging after a third H unit time, and the second H unit time is separated from the third H unit time by 1 H unit time. The point flipping is performed by providing 3H charging to the pixels of the liquid crystal display screen row by row, the voltage difference during the charging of the pixels is effectively reduced, the charging rate is improved, and the display quality is improved.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a pre-charging method and a liquid crystal display screen. Background Technology

[0002] Flickering is a common problem in liquid crystal displays (LCDs), which can be solved by spatially fusing the optical response waveforms of adjacent pixels. This requires that the driving voltages of adjacent pixels maintain opposite polarities. Many driving methods can achieve this, including dot-inversion, column-inversion, and row-inversion. When displaying an image, the pixel voltage Vp applied across the liquid crystal has two polarities: when the signal voltage Vp on the pixel electrode is greater than the COM electrode voltage Vcom, it is called positive polarity; otherwise, it is called negative polarity. As long as the absolute values ​​of the pixel voltages Vp across the liquid crystal are the same, a grayscale image with the same brightness can be displayed.

[0003] In a single frame, each subpixel maintains the opposite polarity to its four adjacent subpixels (up, down, left, and right). This driving method is called dot inversion. In the next frame, the voltage polarity of all subpixels is simultaneously reversed, and adjacent subpixels continue to maintain the opposite polarity. Dot inversion provides the finest spatial blending for flicker, down to each individual subpixel, thus offering the best flicker suppression effect. However, because existing LCD screens use 4H charging technology, dot inversion suffers from insufficient charging rate, reducing display quality. Summary of the Invention

[0004] Existing LCD screens suffer from insufficient charging rate when using dot-to-dot flipping, which reduces display quality.

[0005] To address the aforementioned issues, a pre-charging method and a liquid crystal display screen are proposed. By providing 3H charging to each row of pixels on the liquid crystal display screen for dot flipping, that is, performing pre-charging for only two H units of time and actual charging for one H unit of time, the voltage difference during pixel charging is effectively reduced, the charging rate is improved, and the display quality is enhanced.

[0006] In a first aspect, a pre-charging method includes:

[0007] Step 100: Provide a liquid crystal display screen, the liquid crystal display screen including a control unit and a timing unit, the timing unit being used to output the gate driving timing of the liquid crystal display screen according to a control command;

[0008] Step 200: Using the timing unit, provide the first gate driving timing to all pixels of the liquid crystal display screen to charge the pixels for 3H to perform dot flipping;

[0009] The 3H charging process consists of: pre-charging for the first H unit time and the second H unit time, followed by actual charging for the third H unit time, with a 1 H unit time interval between the second H unit time and the third H unit time.

[0010] In conjunction with the pre-charging method described in the first aspect of the present invention, in a first possible embodiment, step 200 includes:

[0011] Step 210: Sequentially provide the first gate driving timing to the pixels of the liquid crystal display screen within the current frame time to enable gate driving;

[0012] Step 220: During the unit time of the high-level pulse of the first gate driving timing, the pixel is charged with a first 3H, so that the voltage polarity of the pixel is opposite to that of its neighboring pixels.

[0013] In conjunction with the first possible embodiment of the first aspect of the present invention, in the second possible embodiment, step 200 further includes:

[0014] Step 230: In the next frame time sequence, provide the first gate driving timing to the pixels of the liquid crystal display screen to enable gate driving;

[0015] Step 240: During the unit time of the high-level pulse of the first gate drive timing, the pixel is charged with a second 3H, so that the voltage polarity of all pixels is reversed.

[0016] In conjunction with the pre-charging method described in the first aspect of the present invention, in a third possible embodiment, step 200 further includes:

[0017] Step 250: Precharge the positive voltage in the first H unit time, and precharge the negative voltage in the second H unit time;

[0018] Step 260: After the second H unit time, perform a low level for one H unit time;

[0019] Step 270: The actual negative polarity voltage is charged in the third H unit time.

[0020] In conjunction with the pre-charging method described in the first aspect of the present invention, in a third possible embodiment, step 200 further includes:

[0021] Step 280: Precharge the negative voltage in the first H unit time, and precharge the positive voltage in the second H unit time;

[0022] Step 290: After the second H unit time, perform a low level for one H unit time;

[0023] Step 291: The actual positive polarity voltage is charged in the third H unit time.

[0024] In a second aspect, a liquid crystal display screen employs the pre-charging method described in the first aspect, comprising:

[0025] Control unit;

[0026] Timing unit;

[0027] The timing unit is used to provide a first gate driving timing to all pixels of the liquid crystal display screen according to the control command to charge the pixels for 3H, so as to perform dot flipping;

[0028] The 3H charging process consists of: pre-charging for the first H unit time and the second H unit time, followed by actual charging for the third H unit time, with a 1 H unit time interval between the second H unit time and the third H unit time.

[0029] In conjunction with the liquid crystal display screen described in the second aspect of the present invention, in a first possible embodiment, the timing unit is further configured to:

[0030] The first gate drive timing is sequentially provided to the pixels of the liquid crystal display screen within the current frame time to enable gate drive;

[0031] During the unit time of the high-level pulse of the first gate drive timing, the pixel is charged with a first 3H, such that the voltage polarity of the pixel is opposite to that of its neighboring pixels.

[0032] In conjunction with the liquid crystal display screen described in the second aspect of the present invention, in a second possible embodiment, the timing unit is further configured to:

[0033] The first gate drive timing is provided to the pixels of the liquid crystal display screen in the next frame time sequence to enable gate drive;

[0034] During the unit time of the high-level pulse of the first gate drive timing, the pixel is charged with a second 3H, causing the voltage polarity of all pixels to be reversed.

[0035] In conjunction with the liquid crystal display screen described in the second aspect of the present invention, in a third possible embodiment, the timing unit is further configured to:

[0036] The positive voltage is pre-charged in the first H unit time, and the negative voltage is pre-charged in the second H unit time;

[0037] After the second H unit time, a low level is applied for one H unit time;

[0038] The actual negative polarity voltage is charged in the third unit time (H).

[0039] In conjunction with the liquid crystal display screen described in the second aspect of the present invention, in a fourth possible embodiment, the timing unit is further configured to:

[0040] The negative polarity voltage is pre-charged in the first H unit time, and the positive polarity voltage is pre-charged in the second H unit time;

[0041] After the second H unit time, a low level is applied for one H unit time;

[0042] The actual positive polarity voltage is charged in the third unit time (H).

[0043] By implementing the pre-charging method and liquid crystal display screen described in this invention, and by providing 3H charging to the pixels of the liquid crystal display screen row by row for dot flipping, that is, only performing two H unit time of pre-charging and one H unit time of actual charging, the voltage difference during pixel charging is effectively reduced, the charging rate is improved, and the display quality is improved. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 A diagram illustrating the polarity of a pixel being flipped.

[0046] Figure 2 This is a schematic diagram of a common gate drive timing.

[0047] Figure 3 This is a schematic diagram of the first gate driving timing of the present invention;

[0048] Figure 4 This is a first schematic diagram of the pre-charging method in Example 1;

[0049] Figure 5 This is a second schematic diagram of the pre-charging method in Example 1;

[0050] Figure 6 This is a third schematic diagram of the pre-charging method in Example 1;

[0051] Figure 7 This is a fourth schematic diagram of the pre-charging method in Example 1;

[0052] Figure 8 This is the fifth schematic diagram of the pre-charging method in Example 1; Detailed Implementation

[0053] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are all within the scope of protection of this invention.

[0054] Unless otherwise defined, 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 pertains. The terminology used herein in the specification of this 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.

[0055] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0056] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0058] Existing LCD screens suffer from insufficient charging rate when using dot-to-dot flipping, which reduces display quality.

[0059] To address the above problems, a pre-charging method and a liquid crystal display screen are proposed.

[0060] Example 1

[0061] Firstly, such as Figure 4 , Figure 4 This is a first schematic diagram of the pre-charging method in Example 1; a pre-charging method includes:

[0062] Step 100: Provide a liquid crystal display screen, the liquid crystal display screen including a control unit and a timing unit, the timing unit being used to output the gate driving timing of the liquid crystal display screen according to the control command;

[0063] Step 200: Use the timing unit to provide the first gate drive timing to all pixels of the liquid crystal display screen to charge the pixels for 3H to perform dot flipping; wherein, the 3H charging is: pre-charging for the first H unit time and the second H unit time, and actual charging after the third H unit time, with an interval of 1 H unit time between the second H unit time and the third H unit time.

[0064] The dot flipping method of an LCD screen is that the voltage polarity of the pixels surrounding a given pixel is opposite to the voltage polarity of that pixel.

[0065] Preferably, such as Figure 5 , Figure 5 This is a second schematic diagram of the pre-charging method in Embodiment 1; Step 200 includes: Step 210, sequentially providing a first gate driving timing sequence to the pixels of the liquid crystal display screen within the current frame time to enable gate driving; Step 220, charging the pixels for the first 3H within a unit time of the high-level pulse of the first gate driving timing sequence, so that the voltage polarity of the pixel is opposite to that of its adjacent pixels.

[0066] Preferably, such as Figure 6 , Figure 6 This is a third schematic diagram of the pre-charging method in Embodiment 1; Step 200 further includes: 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 enable gate driving; Step 240, performing a second 3H charging on the pixels within a unit time of the high-level pulse of the first gate driving timing sequence, so that the voltage polarity of all pixels is reversed.

[0067] Point flipping means that the voltage polarity of each pixel in the same frame is opposite to that of its neighboring pixels, and the voltage polarity of pixels in different frames is reversed.

[0068] When using 4H charging for pixel driving, a 3H pre-charge is performed first, and the final 1H charging is the actual charging. For example... Figure 2 , Figure 2 Here is a schematic diagram of a common gate drive timing, such as Figure 2In the gate drive timing, the first H of the high-level pulse precharges the positive voltage per unit time, the second H precharges the negative voltage per unit time, the third H precharges the positive voltage per unit time, and the fourth H actually charges the negative voltage per unit time. If it is charging from +5V to -5V, there is a voltage difference of more than 10V in between. Under the current timing, there is a situation of insufficient charging, resulting in poor display quality.

[0069] In this embodiment, as Figure 7 , Figure 7 This is a fourth schematic diagram of the pre-charging method in Embodiment 1; the pre-charging step 200 for one pixel may include:

[0070] Step 250: Precharge the positive voltage in the first H unit time, and precharge the negative voltage in the second H unit time; Step 260: After the second H unit time, perform a low level for one H unit time; Step 270: Actually charge the negative voltage in the third H unit time.

[0071] In this embodiment, as Figure 8 , Figure 8 This is a first schematic diagram of the pre-charging method in Embodiment 1; the pre-charging step 200 of another pixel may also include:

[0072] Step 280: Precharge the negative voltage in the first H unit time, and precharge the positive voltage in the second H unit time; Step 290: After the second H unit time, perform a low level for one H unit time; Step 291: Actually charge the positive voltage in the third H unit time.

[0073] like Figure 3 , Figure 3 This is a schematic diagram of the first gate driving timing of the present invention; as shown below. Figure 3 The first driving timing in the process adopts a 3H charging method, that is, pre-charging is performed in the first H unit time and the second H unit time, and actual charging is performed after the third H unit time. There is an interval of 1 H unit time between the second H unit time and the third H unit time. During this interval of H unit time, the timing is low, that is, the pre-charging of the pixel is turned off during the H unit time, so as to reduce the voltage difference during the charging of the pixel and improve the charging rate.

[0074] The first gate driving timing sequence charges a positive voltage in the first H unit time, and a negative voltage in the second H unit time. During the H unit time interval, the gate goes low, meaning the gate signal is off. This means the positive voltage data in the H unit time cannot charge the pixel. When the negative voltage arrives in the third H unit time, the gate is turned on again. At this point, the negative voltage is charged based on the negative voltage of the second H unit time. If charging from -5V to 0V, the voltage difference is at most slightly over 5V, significantly improving the charging rate. This is an improvement over existing pre-charging technologies, resulting in a better display effect. This process continues to charge the entire screen. By providing 3H charging cycles to each pixel of the LCD screen for dot flipping, i.e., only two H unit time intervals of pre-charging and one H unit time interval of actual charging, the voltage difference during pixel charging is effectively reduced, improving the charging rate and display quality.

[0075] Example 2

[0076] In a second aspect, a liquid crystal display screen employs the pre-charging method of the first aspect, comprising a control unit and a timing unit; the timing unit is used to provide a first gate driving timing to all pixels of the liquid crystal display screen according to a control instruction to charge the pixels for 3H, so as to perform dot flipping; wherein, the 3H charging is: pre-charging for a first H unit time, pre-charging for a second H unit time, and actual charging after a third H unit time, with an interval of 1 H unit time between the second H unit time and the third H unit time.

[0077] Furthermore, the timing unit is also used for:

[0078] Within the current frame time, the first gate drive timing is sequentially provided to the pixels of the liquid crystal display to enable gate drive; within a unit time of the high-level pulse of the first gate drive timing, the pixel is charged with the first 3H, so that the voltage polarity of the pixel is opposite to that of its adjacent pixels.

[0079] Furthermore, timing units are also used for:

[0080] In the next frame time sequence, the first gate drive timing is provided to the pixels of the liquid crystal display to enable gate drive. During the unit time of the high-level pulse of the first gate drive timing, the pixels are charged with the second 3H, so that the voltage polarity of all pixels is reversed.

[0081] Furthermore, timing units are also used for:

[0082] The positive voltage is precharged in the first H unit time, the negative voltage is precharged in the second H unit time, a low level is applied for one H unit time after the second H unit time, and the negative voltage is actually charged in the third H unit time.

[0083] Furthermore, timing units are also used for:

[0084] The negative voltage is precharged in the first H unit time, the positive voltage is precharged in the second H unit time, and after the second H unit time, a low level is applied for one H unit time. The positive voltage is actually charged in the third H unit time.

[0085] The pre-charging method and liquid crystal display screen of the present invention effectively reduce the voltage difference during pixel charging, improve the charging rate, and improve the display quality by providing 3H charging to the pixels of the liquid crystal display screen row by row for dot flipping, that is, only performing two H unit time of pre-charging and one H unit time of actual charging.

[0086] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pre-charging method, characterized in that, include: Step 100: Provide a liquid crystal display screen, the liquid crystal display screen including a control unit and a timing unit, the timing unit being used to output the gate driving timing of the liquid crystal display screen according to a control command; Step 200: Using the timing unit, provide the first gate driving timing to all pixels of the liquid crystal display screen to charge the pixels for 3H to perform dot flipping; The 3H charging includes: pre-charging in the first H unit time and the second H unit time; after the second H unit time, performing a low level for one H unit time; and after the low level for one H unit time, performing actual charging in the third H unit time. Step 200 further includes: Step 250: Precharge the positive voltage in the first H unit time, and precharge the negative voltage in the second H unit time; Step 260: After the second H unit time, perform a low level for one H unit time; Step 270: Actually charge the negative voltage in the third H unit time.

2. The pre-charging method according to claim 1, characterized in that, Step 200 includes: Step 210: Sequentially provide the first gate driving timing to the pixels of the liquid crystal display screen within the current frame time to enable gate driving; Step 220: During the unit time of the high-level pulse of the first gate driving timing, the pixel is charged with a first 3H, so that the voltage polarity of the pixel is opposite to that of its neighboring pixels.

3. The pre-charging method according to claim 2, characterized in that, Step 200 further includes: Step 230: In the next frame time sequence, provide the first gate driving timing to the pixels of the liquid crystal display screen to enable gate driving; Step 240: During the unit time of the high-level pulse of the first gate drive timing, the pixel is charged with a second 3H, so that the voltage polarity of all pixels is reversed.

4. The pre-charging method according to claim 1, characterized in that, The pre-charging includes pre-charging the negative voltage in the first H unit time and pre-charging the positive voltage in the second H unit time; the actual charging is actually charging the positive voltage in the third H unit time.

5. A liquid crystal display screen, employing the pre-charging method according to any one of claims 1-4, characterized in that, include: Control unit; Timing unit; The timing unit is used to provide a first gate driving timing to all pixels of the liquid crystal display screen according to the control command to charge the pixels for 3H, so as to perform dot flipping; The 3H charging process includes: pre-charging in the first H unit time and the second H unit time; performing a low level for one H unit time after the second H unit time; and performing actual charging in the third H unit time after the low level for the first H unit time.

6. The liquid crystal display screen according to claim 5, characterized in that, The timing unit is also used for: The first gate drive timing is sequentially provided to the pixels of the liquid crystal display screen within the current frame time to enable gate drive; During the unit time of the high-level pulse of the first gate drive timing, the pixel is charged with a first 3H, such that the voltage polarity of the pixel is opposite to that of its neighboring pixels.

7. The liquid crystal display screen according to claim 6, characterized in that, The timing unit is also used for: The first gate drive timing is provided to the pixels of the liquid crystal display screen in the next frame time sequence to enable gate drive; During the unit time of the high-level pulse of the first gate drive timing, the pixel is charged with a second 3H, causing the voltage polarity of all pixels to be reversed.

8. The liquid crystal display screen according to claim 5, characterized in that, The timing unit is also used for: The positive voltage is pre-charged in the first H unit time, the negative voltage is pre-charged in the second H unit time, and the negative voltage is actually charged in the third H unit time.

9. The liquid crystal display screen according to claim 5, characterized in that, The timing unit is also used for: The negative polarity voltage is pre-charged in the first H unit time, the positive polarity voltage is pre-charged in the second H unit time, and the positive polarity voltage is actually charged in the third H unit time.

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