Pixel charging method and display panel

Abstract

This application discloses a pixel charging method and a display panel. In the pixel charging method and display panel of this application, in the first frame, a positive polarity signal is input to a portion of the data lines, and after a first preset time interval, a negative polarity signal is input to the other data lines to change the phase of the positive and negative polarity signals (positive polarity first, negative polarity last); in the second frame, a negative polarity signal is input to a portion of the data lines, and after a second preset time interval, a positive polarity signal is input to the other data lines to change the phase of the positive and negative polarity signals (negative polarity first, positive polarity last); that is, in the first frame, the power supply voltage will shift with the polarity direction, and the first power supply interference will occur; in the second frame, the power supply voltage will shift with the polarity direction, and the second power supply interference will occur; through the mutual cancellation of the two interferences, while ensuring a high overall charging rate, horizontal crosstalk during display can be avoided.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a pixel charging method and a display panel. Background Technology

[0002] Please see Figure 1 , Figure 1 A diagram illustrating the charging of pixels in an existing display panel. (Example) Figure 1 As shown, existing display panels have the same charging time for both positive and negative polarities. The positive signal P and the negative signal N are transmitted to the data line simultaneously. Due to the relatively long falling edge time of the gate signal, the positive signal P may not charge the pixel (V+) sufficiently, and the negative signal N may charge the pixel (V-) incorrectly. Therefore, by utilizing the time difference between the output of the positive and negative signals, the charging process can be improved.

[0003] However, when there is a time difference between the output of positive and negative signals, the power supply voltage will shift with the polarity direction, causing power supply interference. This interference affects the common electrode voltage, resulting in horizontal crosstalk during display. Summary of the Invention

[0004] This application provides a pixel charging method and a display panel to solve the technical problem that, while ensuring a high overall charging rate, when there is a time difference between the output of positive and negative polarity signals, the power supply voltage will shift with the polarity direction and cause power supply interference, which will affect the voltage of the common electrode and cause horizontal crosstalk during display.

[0005] In a first aspect, this application provides a pixel charging method for a display panel, the display panel including a pixel array, a first data line, and a second data line, the first data line and the second data line being electrically connected to the pixel array, the pixel charging method including:

[0006] In the first frame, a positive signal is input to the first data line, and after a first preset time interval, a negative signal is input to the second data line; and

[0007] In the second frame, a negative polarity signal is input to the first data line, and after a second preset time interval, a positive polarity signal is input to the second data line.

[0008] In the pixel charging method provided in this application, the first preset duration is equal to the second preset duration.

[0009] In the pixel charging method provided in this application, the step of inputting a positive polarity signal to the first data line in the first frame, and then inputting a negative polarity signal to the second data line after a first preset time interval, includes:

[0010] Turn on the thin-film transistor switch of the current row pixel;

[0011] Input a positive polarity signal to the first data line;

[0012] At a first preset time interval, a negative polarity signal is input to the second data line;

[0013] Turn off the thin-film transistor switch of the current row pixel.

[0014] In the pixel charging method provided in this application, before the step of turning on the thin-film transistor switch of the current row pixel, the method further includes:

[0015] The time difference between the turn-off time of the thin-film transistor switch corresponding to the first data line with the input positive polarity signal and the turn-off time of the thin-film transistor switch corresponding to the second data line with the input negative polarity signal is obtained; wherein, the first preset duration is the duration of the time difference.

[0016] In the pixel charging method provided in this application, the step of turning off the thin-film transistor switch of the current row pixel includes:

[0017] Pause or stop sending gate signals to the current row pixel;

[0018] The thin-film transistor switch corresponding to the first data line that receives a positive polarity signal is turned off after a first delay.

[0019] The thin-film transistor switch corresponding to the second data line that receives the negative polarity signal is turned off after a second delay, the second delay being longer than the first delay.

[0020] In the pixel charging method provided in this application, the step of inputting a negative polarity signal to the first data line in the second frame, and then inputting a positive polarity signal to the second data line after a second preset time interval, includes:

[0021] Turn on the thin-film transistor switch of the current row pixel;

[0022] Input a negative polarity signal to the first data line;

[0023] At a second preset time interval, a positive polarity signal is input to the second data line;

[0024] Turn off the thin-film transistor switch of the current row pixel.

[0025] In the pixel charging method provided in this application, before the step of turning on the thin-film transistor switch of the current row pixel, the method further includes:

[0026] The time difference between the turn-off time of the thin-film transistor switch corresponding to the first data line of the input negative polarity signal and the turn-off time of the thin-film transistor switch corresponding to the second data line of the input positive polarity signal is obtained; wherein, the second preset duration is the duration of the time difference.

[0027] In the pixel charging method provided in this application, the step of turning off the thin-film transistor switch of the current row pixel includes:

[0028] Pause or stop sending gate signals to the current row pixel;

[0029] The thin-film transistor switch corresponding to the first data line that receives a negative polarity signal is turned off after a first delay.

[0030] The thin-film transistor switch corresponding to the second data line that receives the positive polarity signal is turned off after a second delay, the second delay being longer than the first delay.

[0031] In the pixel charging method provided in this application, both the first preset duration and the second preset duration are between 0.5 microseconds and 1 microsecond.

[0032] Secondly, this application also provides a display panel, which includes:

[0033] The first charging module is used to input a positive polarity signal to the first data line in the first frame and input a negative polarity signal to the second data line after an interval of a first preset time.

[0034] The second charging module is used to input a negative polarity signal to the first data line in the second frame, and then input a positive polarity signal to the second data line after a second preset time interval.

[0035] In the pixel charging method and display panel of this application, in the first frame, a positive polarity signal is input to a portion of the data lines, and after a first preset time interval, a negative polarity signal is input to the other data lines to change the phase of the positive and negative polarity signals (positive polarity first, negative polarity last); in the second frame, a negative polarity signal is input to a portion of the data lines, and after a second preset time interval, a positive polarity signal is input to the other data lines to change the phase of the positive and negative polarity signals (negative polarity first, positive polarity last); that is, in the first frame, the power supply voltage will shift with the polarity direction, and the first power supply interference will occur; in the second frame, the power supply voltage will shift with the polarity direction, and the second power supply interference will occur; through the mutual cancellation of the two interferences, while ensuring a high overall charging rate, horizontal crosstalk problems during display can be avoided. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic diagram illustrating the charging of pixels in an existing display panel;

[0038] Figure 2 This is a schematic flowchart of a pixel charging method according to an embodiment of this application;

[0039] Figure 3 This is a schematic diagram of a first specific process of a pixel charging method according to an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of a first charging method for the display panel according to an embodiment of this application;

[0041] Figure 5 This is a schematic diagram of a second specific process of the pixel charging method according to an embodiment of this application;

[0042] Figure 6 This is a schematic diagram of a second charging method for the display panel according to an embodiment of this application;

[0043] Figure 7 This is a schematic diagram of the structure of the display panel according to an embodiment of this application. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. It should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. The terms "first," "second," etc., in the claims and specification of this application are used to distinguish different objects, not to describe a specific order.

[0045] Please see Figure 2 , Figure 2 This is a schematic flowchart of a pixel charging method according to an embodiment of this application. This application provides a pixel charging method for a display panel, wherein the display panel is a liquid crystal display panel.

[0046] The display panel includes a pixel array and data lines electrically connected to the pixel array. The data lines include a first data line and a second data line. Both the first data line and the second data line are electrically connected to the pixel array. The pixel charging method of this application embodiment includes:

[0047] Step S1: In the first frame, a positive signal is input to the first data line, and after a first preset time interval, a negative signal is input to the second data line.

[0048] Step S2: In the second frame, input a negative polarity signal to the first data line, and after a second preset time interval, input a positive polarity signal to the second data line.

[0049] The pixel charging method of this application embodiment inputs a positive polarity signal to a portion of the data lines in the first frame, and then inputs a negative polarity signal to the other data lines after a first preset time interval, thereby changing the phase of the positive and negative polarity signals (positive polarity first, negative polarity last); in the second frame, a negative polarity signal is input to a portion of the data lines, and then a positive polarity signal is input to the other data lines after a second preset time interval, thereby changing the phase of the positive and negative polarity signals (negative polarity first, positive polarity last); that is, in the first frame, the power supply voltage will shift with the polarity direction, and the first power supply interference will occur; in the second frame, the power supply voltage will shift with the polarity direction, and the second power supply interference will occur; through the mutual cancellation of the two interferences, while ensuring a high overall charging rate, horizontal crosstalk problems can be avoided during display.

[0050] For details, please refer to Figure 3 , Figure 3 This is a schematic diagram illustrating a first specific process of the pixel charging method according to an embodiment of this application. (Combined with...) Figure 2, Figure 3 As shown, the step of inputting a positive polarity signal to the first data line in the first frame, and then inputting a negative polarity signal to the second data line after a first preset time interval, includes:

[0051] Step S11: Turn on the thin-film transistor switch of the current row pixel;

[0052] Step S12: Input a positive polarity signal to the first data line;

[0053] Step S13: After a first preset time interval, input a negative polarity signal to the second data line;

[0054] Step S14: Turn off the thin-film transistor switch of the current row pixel.

[0055] In step S11, the display panel may include a display substrate and multiple rows of scan lines, multiple columns of data lines, and multiple rows and columns of pixels disposed on the display substrate. It should be understood that each pixel is electrically connected to one row of scan lines and one column of data lines, so that when a gate signal is input to a row of scan lines to turn on the thin-film transistor switch, and a voltage signal is written to a column of data lines, the voltage signal can be charged into the pixel connected to that row of scan lines and that column of data lines. Optionally, the gate of the thin-film transistor of each pixel is electrically connected to a scan line, and the source or drain of the thin-film transistor of each pixel is electrically connected to a data line.

[0056] In step S12, a positive polarity signal can be input to the first data line based on the confirmation result of the polarity of the voltage signals to be input to the first and second data lines respectively. For example, according to the confirmation result, a positive polarity signal needs to be input to the first data line in the i-th frame. Therefore, when the thin-film transistor switch in the current row is turned on, a positive polarity signal can be input to the first data line, where i is a positive integer.

[0057] In step S13, based on the example in step S12 and according to the above confirmation result: a negative polarity signal is input to the second data line, then after an interval of a first preset time, a negative polarity signal can be input to the second data line again. Optionally, the first preset time can be between 0.5 microseconds (inclusive) and 1 microsecond (inclusive). In this embodiment, the first preset time can also be 0.6 microseconds, 0.7 microseconds, 0.8 microseconds, or 0.9 microseconds.

[0058] For details, please refer to Figure 4 , Figure 4This is a schematic diagram of a first charging method for a display panel according to an embodiment of this application. The pixel charging method of this embodiment controls the switching of a thin-film transistor switch via a gate signal. It uses a positive signal input to the corresponding data line a first preset time before the negative signal to change the phase of the positive signal P and the negative signal N (positive signal first, negative signal last), thereby increasing the charging time of the positive signal P, improving the charging rate, and decreasing the charging time of the negative signal N to avoid incorrect charging, thus improving the overall charging rate of the display panel.

[0059] In step S14, the step of turning off the thin-film transistor switch of the current row pixel includes: pausing or stopping the transmission of gate signals to the current row pixel; turning off the thin-film transistor switch corresponding to the first data line receiving a positive polarity signal for a first duration; and turning off the thin-film transistor switch corresponding to the second data line receiving a negative polarity signal for a second duration. The second duration is longer than the first duration.

[0060] Specifically, pausing or stopping the transmission of gate signals to the current row pixel means turning off the gate signal of the current row scan line. Because the falling edge of the gate signal has a longer time and the voltage of the positive signal is higher than that of the negative signal, even with the same gate signal, the thin-film transistor switch corresponding to the positive signal will turn off earlier than the thin-film transistor switch corresponding to the negative signal.

[0061] Furthermore, before the step of turning on the thin-film transistor switch of the current row pixel, the method further includes: obtaining the time difference between the thin-film transistor switch turning off time corresponding to the first data line of the input positive polarity signal and the thin-film transistor switch turning off time corresponding to the second data line of the input negative polarity signal; the first preset duration is the duration of the time difference.

[0062] Specifically, a pixel includes a thin-film transistor (TFT) switch and a pixel electrode electrically connected to the TFT switch. The TFT switch can be a P-type or N-type transistor switch. During the trial operation of the display panel, the gate signal of the current row of pixels is turned off, thus turning off the TFT switch of the current row of pixels. Specifically, the TFT switch is considered off when the gate signal is lower than the voltage signal of its corresponding data line. During the TFT switch turning off process, because the falling edge time of the gate signal is longer and the positive voltage is higher than the negative voltage, even with the same gate signal, the TFT switch corresponding to the positive polarity will turn off earlier than the TFT switch corresponding to the negative polarity. Therefore, when the positive and negative polarity signals are simultaneously input to the corresponding data lines, the charging time of the positive electrode is shorter than that of the negative electrode.

[0063] Because the thin-film transistor switch corresponding to the positive polarity signal turns off earlier than the thin-film transistor switch corresponding to the negative polarity signal, there is a time difference between them. This embodiment aims to obtain the duration of this time difference. Optionally, the time difference can be the average or median of the time differences obtained from multiple times the thin-film transistor switch is turned off in the current row, or it can be other values.

[0064] Optionally, the duration of the time difference is between 0.5 microseconds (inclusive) and 1 microsecond (inclusive). In this embodiment, the duration of the time difference can be 0.6 microseconds, 0.7 microseconds, 0.8 microseconds, or 0.9 microseconds.

[0065] For details, please refer to Figure 5 , Figure 5 This is a schematic diagram illustrating a second specific process of the pixel charging method according to an embodiment of this application. (In conjunction with...) Figure 2 , Figure 5 As shown, in the second frame, the step of inputting a negative polarity signal to the first data line and then, after a second preset time interval, inputting a positive polarity signal to the second data line includes:

[0066] Step S21: Turn on the thin-film transistor switch of the current row pixel;

[0067] Step S22: Input a negative polarity signal to the first data line;

[0068] Step S23: At a second preset time interval, input a positive polarity signal to the second data line;

[0069] Step S24: Turn off the thin-film transistor switch of the current row pixel.

[0070] In step S21, the display panel may include a display substrate and multiple rows of scan lines, multiple columns of data lines, and multiple rows and columns of pixels disposed on the display substrate. It should be understood that each pixel is electrically connected to one row of scan lines and one column of data lines, so that when a gate signal is input to a row of scan lines to turn on the thin-film transistor switch, and a voltage signal is written to a column of data lines, the voltage signal can be injected into the pixel connected to that row of scan lines and that column of data lines. Optionally, the gate of the thin-film transistor of each pixel is electrically connected to a scan line, and the source or drain of the thin-film transistor of each pixel is electrically connected to a data line.

[0071] In step S22, a negative polarity signal can be input to the first data line based on the confirmation result of the polarity of the voltage signals to be input to the first and second data lines respectively. For example, according to the confirmation result, if a negative polarity signal needs to be input to the first data line in the i-th frame, then when the thin-film transistor switch in the current row is turned on, a negative polarity signal can be input to the first data line, where i is a positive integer.

[0072] In step S23, based on the example in step S12, and according to the confirmation result above: if a negative polarity signal is input to the second data line, then after a second preset time interval, a positive polarity signal can be input to the second data line. Optionally, the second preset time interval can be between 0.5 microseconds (inclusive) and 1 microsecond (inclusive). In this embodiment, the second preset time interval can also be 0.6 microseconds, 0.7 microseconds, 0.8 microseconds, or 0.9 microseconds.

[0073] For details, please refer to Figure 6 , Figure 6 This is a schematic diagram of a second charging method for the display panel according to an embodiment of this application. The pixel charging method of this embodiment controls the switching of a thin-film transistor switch via a gate signal. It uses a negative polarity signal input to the corresponding data line a second preset time before the positive polarity signal, thereby changing the phase of the positive polarity signal P and the negative polarity signal N (negative polarity first, positive polarity last). This increases the charging time of the negative polarity signal N, improving the charging rate, and decreases the charging time of the positive polarity signal N, avoiding incorrect charging, thus improving the overall charging rate of the display panel.

[0074] In step S24, the step of turning off the thin-film transistor switch of the current row pixel includes: pausing or stopping the transmission of gate signals to the current row pixel; delaying the closing of the thin-film transistor switch corresponding to the first data line receiving a negative polarity signal for a first duration; and delaying the closing of the thin-film transistor switch corresponding to the second data line receiving a positive polarity signal for a second duration. The second duration is longer than the first duration.

[0075] Specifically, pausing or stopping the transmission of gate signals to the current row pixel means turning off the gate signal of the current row scan line. Because the falling edge of the gate signal has a longer time and the voltage of the positive signal is higher than that of the negative signal, even with the same gate signal, the thin-film transistor switch corresponding to the positive signal will turn off earlier than the thin-film transistor switch corresponding to the negative signal.

[0076] Furthermore, before the step of turning on the thin-film transistor switch of the current row pixel, the method further includes: obtaining the time difference between the thin-film transistor switch turning off time corresponding to the first data line of the input negative polarity signal and the thin-film transistor switch turning off time corresponding to the second data line of the input positive polarity signal; the second preset duration is the duration of the time difference.

[0077] Specifically, a pixel includes a thin-film transistor (TFT) switch and a pixel electrode electrically connected to the TFT switch. The TFT switch can be a P-type or N-type transistor switch. During the trial operation of the display panel, the gate signal of the current row of pixels is turned off, thus turning off the TFT switch of the current row of pixels. Specifically, the TFT switch is considered off when the gate signal is lower than the voltage signal of its corresponding data line. During the TFT switch turning off process, because the falling edge time of the gate signal is longer and the positive voltage is higher than the negative voltage, even with the same gate signal, the TFT switch corresponding to the positive polarity will turn off earlier than the TFT switch corresponding to the negative polarity. Therefore, when the positive and negative polarity signals are simultaneously input to the corresponding data lines, the charging time of the positive electrode is shorter than that of the negative electrode.

[0078] Because the thin-film transistor switch corresponding to the positive polarity signal turns off earlier than the thin-film transistor switch corresponding to the negative polarity signal, there is a time difference between them. This embodiment aims to obtain the duration of this time difference. Optionally, the time difference can be the average or median of the time differences obtained from multiple times the thin-film transistor switch is turned off in the current row, or it can be other values.

[0079] Optionally, the duration of the time difference is between 0.5 microseconds (inclusive) and 1 microsecond (inclusive). In this embodiment, the duration of the time difference can be 0.6 microseconds, 0.7 microseconds, 0.8 microseconds, or 0.9 microseconds.

[0080] In this embodiment, the first preset duration is equal to the second preset duration. That is, in the pixel charging method of this application, in the first frame, a positive polarity signal is input to a portion of the data lines, and after a first preset duration, a negative polarity signal is input to the other data lines to change the phase of the positive and negative polarity signals (positive polarity first, negative polarity last); in the second frame, a negative polarity signal is input to a portion of the data lines, and after a second preset duration, a positive polarity signal is input to the other data lines to change the phase of the positive and negative polarity signals (negative polarity first, positive polarity last). In other words, in the first frame, the power supply voltage shifts with the polarity direction, resulting in the first power supply interference; in the second frame, the power supply voltage shifts with the polarity direction, resulting in the second power supply interference. Through the mutual cancellation of the two interferences, while ensuring a high overall charging rate, horizontal crosstalk during display can be avoided.

[0081] Please see Figure 7 , Figure 7 This is a schematic diagram of the display panel structure according to an embodiment of this application. Figure 7As shown, the application embodiment also relates to a display panel 100, which includes a first charging module and a second charging module. The first charging module is used to input a positive polarity signal to a first data line in a first frame, and then input a negative polarity signal to a second data line after a first preset time interval. The second charging module is used to input a negative polarity signal to the first data line in a second frame, and then input a positive polarity signal to the second data line after a second preset time interval. It should be noted that the display panel in this application embodiment uses the pixel charging method described above, which can be referred to the above description and will not be repeated here.

[0082] The display panel of this application inputs a positive polarity signal to a portion of the data lines in the first frame, and then inputs a negative polarity signal to the other data lines after a first preset time interval, thereby changing the phase of the positive and negative polarity signals (positive polarity first, negative polarity last); in the second frame, it inputs a negative polarity signal to a portion of the data lines, and then inputs a positive polarity signal to the other data lines after a second preset time interval, thereby changing the phase of the positive and negative polarity signals (negative polarity first, positive polarity last). That is, in the first frame, the power supply voltage will shift with the polarity direction, resulting in the first power supply interference; in the second frame, the power supply voltage will shift with the polarity direction, resulting in the second power supply interference. Through the mutual cancellation of the two interferences, while ensuring a high overall charging rate, horizontal crosstalk during display can be avoided.

[0083] The pixel charging method and display panel provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A pixel charging method for a display panel, the display panel comprising a pixel array, a first data line, and a second data line, wherein the first data line and the second data line are both electrically connected to the pixel array, characterized in that, The pixel charging method includes: In the first frame, a first time difference is obtained between the turn-off time of the thin-film transistor switch corresponding to the first data line receiving a positive input signal and the turn-off time of the thin-film transistor switch corresponding to the second data line receiving a negative input signal. The duration of the first time difference is determined as a first preset duration. The thin-film transistor switch of the current row pixel is turned on, a positive input signal is input to the first data line, and after an interval of the first preset duration, a negative input signal is input to the second data line to turn off the thin-film transistor switch of the current row pixel. In the second frame, the second time difference between the closing time of the thin-film transistor switch corresponding to the first data line that inputs a negative polarity signal and the closing time of the thin-film transistor switch corresponding to the second data line that inputs a positive polarity signal is obtained. The duration of the second time difference is determined as a second preset duration. The thin-film transistor switch of the current row pixel is turned on, a negative polarity signal is input to the first data line, and after an interval of the second preset duration, a positive polarity signal is input to the second data line to turn off the thin-film transistor switch of the current row pixel.

2. The pixel charging method according to claim 1, characterized in that, The first preset duration is equal to the second preset duration.

3. The pixel charging method according to claim 1, characterized in that, The step of turning off the thin-film transistor switch of the current row pixel includes: Pause or stop sending gate signals to the current row pixel; The thin-film transistor switch corresponding to the first data line that receives a positive polarity signal is turned off after a first delay. The thin-film transistor switch corresponding to the second data line that receives the negative polarity signal is turned off after a second delay, the second delay being longer than the first delay.

4. The pixel charging method according to claim 1, characterized in that, The step of turning off the thin-film transistor switch of the current row pixel includes: Pause or stop sending gate signals to the current row pixel; The thin-film transistor switch corresponding to the first data line that receives a negative polarity signal is turned off after a first delay. The thin-film transistor switch corresponding to the second data line that receives the positive polarity signal is turned off after a second delay, the second delay being longer than the first delay.

5. The pixel charging method according to claim 1, characterized in that, Both the first preset duration and the second preset duration are between 0.5 microseconds and 1 microsecond.

6. A display panel, characterized in that, include: The first charging module is used to input a positive polarity signal to the first data line in the first frame and input a negative polarity signal to the second data line after a first preset time interval. The second charging module is used to input a negative polarity signal to the first data line in the second frame and input a positive polarity signal to the second data line after a second preset time interval. The first preset duration is the duration of the first time difference between the turn-off time of the thin-film transistor switch corresponding to the first data line with the input positive polarity signal and the turn-off time of the thin-film transistor switch corresponding to the second data line with the input negative polarity signal. The second preset duration is the duration of the second time difference between the turn-off time of the thin-film transistor switch corresponding to the first data line with the input negative polarity signal and the turn-off time of the thin-film transistor switch corresponding to the second data line with the input positive polarity signal.

Images