Display panel, driving method thereof, display panel driving chip and display device

Abstract

The application provides a display panel, a driving method thereof, a display panel driving chip and a display device. The driving method of the display panel comprises the following steps: providing a turn-on voltage to a scan line in a charging period; providing a holding period pre-charging voltage to a data line in a first pre-charging period, and the first pre-charging period is located in the holding period; providing an interval period pre-charging voltage to the data line in a second pre-charging period, and the second pre-charging period is located in an interval period, and the interval period is located between the charging period and an adjacent holding period. The driving method of the display panel can improve the flicker performance of the display panel and realize visual optimization of a display picture.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel and its driving method, a display panel driving chip and a display device. Background Technology

[0002] As market competition intensifies, the demand for cost control in mobile device display panels continues to grow. In particular, in low-temperature polysilicon (LTPS) display technology, reducing the number of masks to minimize yield loss and save manufacturing costs has become a research focus in the industry.

[0003] Mainstream LTPS display panels typically employ a 9-mask process for their array fabrication. To further reduce costs, some solutions attempt to eliminate the light-shielding layer and use an 8-mask process. However, this increases optical leakage current, leading to flicker performance and deterioration of crosstalk visual effects. Especially at low refresh rates, the increased pixel holding time amplifies the negative impact of optical leakage current, resulting in decreased display stability and quality. Currently, display characteristics are typically improved by increasing pixel capacitance (Cst) or reducing optical leakage current. However, these solutions involve multiple process and component adjustments, resulting in complex processes with poor controllability, making stable implementation in mass production difficult.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] Based on this, embodiments of this application provide a display panel and its driving method, a display panel driving chip and a display device, which can improve the flicker performance of the display panel and achieve visual optimization of the displayed image.

[0006] According to some embodiments, this application provides a display panel driving method, wherein the display panel operates in a first operating mode, and in the first operating mode, the operation of the display panel includes a charging period and a holding period. The display panel driving method includes:

[0007] During the charging period, a conduction voltage is provided to the scan line;

[0008] During the first precharge period, a hold-up precharge voltage is provided to the data line, and the first precharge period is located within the hold-up period.

[0009] During a second precharge period, an interval precharge voltage is provided to the data line. The second precharge period is located within an interval period, which is located between the charging period and the adjacent hold period.

[0010] According to some embodiments, this application also provides a display panel that applies the display panel driving method provided in the foregoing embodiments.

[0011] According to some embodiments, this application also provides a display panel driver chip, wherein the operating mode of the display panel includes a first operating mode, and in the first operating mode, the operating process of the display panel includes a charging period and a holding period; the display panel is configured with a scan driving unit for providing a conduction voltage to the scan lines during the charging period;

[0012] The display panel driver chip includes a data driver unit, which is used to provide a hold period precharge voltage to the data line during a first precharge period and to provide an interval period precharge voltage to the data line during a second precharge period.

[0013] The first pre-charging period is located within the holding period, the second pre-charging period is located within the interval period, and the interval period is located between the charging period and the adjacent holding period.

[0014] According to some embodiments, this application further provides a display device, the display device including the display panel provided in the foregoing embodiments and the display panel driver chip provided in the foregoing embodiments.

[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application.

[0016] The embodiments of this application may have, or at least have, the following advantages:

[0017] First, this application improves the flicker performance of the display panel by setting a first pre-charge period during the hold period and providing a hold period pre-charge voltage to the data line, enabling the pixels to have a stable potential state during the hold period and reducing the impact of leakage current. For example, in low-frequency operating mode, the hold time of the pixels increases. This application improves the flicker performance in low-frequency operating mode by enabling the pixels to obtain a stable potential state during the hold period, reducing the impact of leakage current caused by the extended hold time.

[0018] Meanwhile, this application also sets a second pre-charge period during the interval period and provides the data line with the pre-charge voltage during the interval period. By pre-charging during the hold period and the interval period respectively, the pixels can maintain a stable voltage distribution, thereby effectively reducing the uneven brightness and white frame visual abnormality caused by leakage current, achieving visual optimization of the display screen, and making the white frame area invisible in the display effect.

[0019] Other advantages, objectives, and features of this application will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from practice of this application. The objectives and other advantages of this application can be realized and obtained through the following description. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0021] Figure 1 This is a timing diagram showing the relationship between the precharge voltage signal during the holding period and the precharge voltage signal during the interval period in some embodiments of this application;

[0022] Figure 2 This is a top view of the display panel in some embodiments of this application;

[0023] Figure 3 This is a schematic diagram showing the layout of the common electrode and touch signal lines in some embodiments of this application;

[0024] Figure 4 for Figure 3 A schematic diagram of a partial structure of the common electrode shown;

[0025] Figure 5 This is a timing diagram showing the precharge voltage signal, touch pulse signal, and gate scan signal in some embodiments of this application;

[0026] Figure 6 This is a timing diagram showing the relationship between the precharge voltage during the first interval period, the precharge voltage during the holding period, and the precharge voltage during the second interval period in some embodiments of this application.

[0027] Figure 7 This is a schematic diagram illustrating the process of providing a holding period precharge voltage to the data line during the first precharge period in some embodiments of this application;

[0028] Figure 8 This is a timing diagram showing different pre-charge methods for maintaining the time period in some embodiments of this application;

[0029] Figure 9This is a schematic diagram illustrating the process of providing a holding period precharge voltage to the data line during the first precharge period in some other embodiments of this application;

[0030] Figure 10 This is a timing diagram showing the relationship between the third pre-charge voltage and the fourth pre-charge voltage during the holding period in some embodiments of this application;

[0031] Figure 11 This is a timing diagram of different pre-charge methods for different time intervals in some embodiments of this application;

[0032] Figure 12 This is a schematic diagram illustrating the process of providing an interval precharge voltage to the data line during the second precharge period in some embodiments of this application;

[0033] Figure 13 This is a timing diagram showing the relationship between the first pre-charge voltage and the second pre-charge voltage during the interval period in some embodiments of this application;

[0034] Figure 14 This is a schematic diagram showing the connection relationship between the display panel and the display panel driver chip in some embodiments of this application;

[0035] Figure 15 This is a schematic diagram of the structure of the display device in some embodiments of this application. Detailed Implementation

[0036] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0037] 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 application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0038] In the following text, although terms such as “first” and “second” may be used to describe various components, these components are not necessarily limited to the terms above. The terms above are only used to distinguish one component from another. It will also be understood that expressions used in the singular form include plural expressions, unless the singular form has a distinctly different meaning in the context.

[0039] When a phrase such as "at least one of..." follows a list of elements, it modifies the entire list of elements, not individual elements within that list. It should also be understood that terms such as "comprising / including" or "having" specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0040] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this application can be combined with each other without contradiction.

[0041] At low refresh rates, the holding time of pixels increases, making the adverse effects of optical leakage current more significant, leading to a decrease in display stability and quality. Currently, display characteristics are typically improved by increasing pixel capacitance (Cst) or reducing optical leakage current. However, such solutions involve multiple process and component adjustments, resulting in complex processes and poor controllability, making it difficult to achieve stable mass production.

[0042] In view of the above-mentioned shortcomings, this application provides a display panel and its driving method, a display panel driving chip and a display device, which can improve the flicker performance of the display panel and achieve visual optimization of the displayed image. Details will be described in subsequent embodiments.

[0043] Exemplary examples show that the display panel involved in this application may include a liquid crystal display (LCD), an organic light-emitting diode (OLED), a quantum dot light-emitting diode (QLED), a mini light-emitting diode display (Mini LED), or a micro light-emitting diode display (Micro LED), etc., but are not limited thereto. This application uses an LCD display panel as an example for illustration.

[0044] In this embodiment, the operating mode of the display panel includes a first operating mode. In the first operating mode, the operation process of the display panel includes a charging period and a holding period.

[0045] Please see Figure 1 , Figure 1 This is a flowchart illustrating the display panel driving method provided in an embodiment of this application. The display panel driving method includes the following working process:

[0046] During the charging period, a conduction voltage is provided to the scan line; during the first pre-charge period, a hold period pre-charge voltage is provided to the data line, which is located within the hold period; during the second pre-charge period, an interval period pre-charge voltage is provided to the data line, which is located within the interval period, which is located between the charging period and the adjacent hold period.

[0047] Specifically, during the charging period, the conduction voltage transmitted by the scan lines turns on the pixel switching transistors of the corresponding rows, allowing the data lines to write data signals to the pixel electrodes, thus completing the data voltage writing. The charging period can be used to complete the pixel charging operation, enabling the light-emitting element or liquid crystal cell corresponding to each pixel to obtain the driving voltage required for display.

[0048] During the hold period, a shutdown voltage is provided on the scan line, and the pixel switching transistor corresponding to the pixel is in the off state. The conduction path between the data line and the pixel electrode is cut off. Therefore, the hold period precharge voltage provided to the data line at this time will not be written to the pixel electrode. However, by setting a first precharge period during the hold period and applying the hold period precharge voltage to the data line during this period, the voltage difference between the source electrode and the drain electrode of the transistor can be adjusted, so that the transistor remains in a more stable off state, reducing the leakage current of the transistor. This avoids pixel voltage decay caused by leakage current, and the potential of the pixel electrode can remain stable throughout the hold period, thereby effectively improving the flicker performance and uneven display brightness in low-frequency operating mode.

[0049] In this embodiment, the interval period is located between the charging period and the adjacent hold period. During this time, the scan line is in a non-gated state, and the pixel switching transistor is off. Because the data voltage is prone to sudden changes during inter-frame switching, it can cause visual anomalies such as white frames or uneven brightness. By setting a second pre-charge period within the interval period and providing an interval pre-charge voltage to the data line, the potential of the data line is adjusted, reducing potential changes in the pixel electrodes during inter-frame switching, thereby improving the stability of the displayed image, suppressing white frame phenomena, and further optimizing flicker performance.

[0050] Figure 1This is a timing diagram showing the relationship between the precharge voltage signal during the holding period and the precharge voltage signal during the interval period in the embodiments of this application. Combined with... Figure 1 It is understood that the above-described display panel driving method improves the flicker performance of the display panel by setting a first pre-charge period during the hold period and providing a hold period pre-charge voltage to the data line, enabling the pixels to have a stable potential state during the hold period, reducing the impact of leakage current.

[0051] As an example, the first operating mode may correspond to the low-frequency operating mode of the display panel. For example, the refresh rate of the display panel may be 60 Hz, 45 Hz, 30 Hz, 20 Hz, 10 Hz, etc. In this mode, the refresh rate of the display panel is low, and the holding time of the pixels is relatively long, so it is more susceptible to leakage current, which can lead to display problems such as flicker or crosstalk.

[0052] The aforementioned display panel driving method improves flicker performance in low-frequency operating mode by enabling pixels to obtain a stable potential state during the holding period, thereby reducing the impact of leakage current caused by prolonged holding time.

[0053] Meanwhile, the aforementioned display panel driving method also sets a second pre-charge period during the interval period and provides the data line with the pre-charge voltage during the interval period, effectively extending the pre-charge duration. By performing pre-charge during the hold period and the interval period respectively, the pixels can maintain a stable voltage distribution, thereby effectively reducing the uneven brightness and white frame visual abnormality caused by leakage current, achieving visual optimization of the display screen, and making the white frame area invisible in the display effect.

[0054] Furthermore, in some embodiments, the display panel's operating mode may also include a second operating mode, corresponding to a high-frequency operating mode. In the high-frequency operating mode, the display panel's refresh rate can be greater than 60 Hz, such as 120 Hz, 144 Hz, etc. In the high-frequency operating mode, the display panel's refresh rate is higher, and the pixel holding time is significantly shortened or even eliminated. In this case, leakage current has a smaller impact, so a holding period is not required. The display panel driving method provided in this application can also be adapted to actual needs in this situation.

[0055] As an example, such as Figure 1 As shown, the hold period can be set after the charging period. It should be noted that the position of the hold period is not limited to this example; in other implementations, the hold period can be set at different positions according to the design requirements of the display timing. The following explanation uses the example of the hold period being after the charging period.

[0056] For example, the display panel may also include a common electrode, which may include multiple touch electrodes. In other words, the common electrode can be reused as a touch electrode to simultaneously perform the functions of display driving and touch detection.

[0057] During the display phase, the display panel can provide a common voltage to the common electrode (i.e., the touch electrode connected to each touch signal line) through the touch signal line; while during the touch phase, the display panel can provide touch signals (i.e., touch pulses) to the corresponding touch electrode through the touch signal line.

[0058] Please see Figures 2 to 4 , Figures 2 to 4 The diagram illustrates the electrode distribution within the display panel and its structural relationships related to touch control. It should be noted that... Figures 2 to 4 The pixel electrodes, common electrodes, and touch signal lines shown are simplified illustrations for explaining the principles of this application and are not drawn to scale.

[0059] like Figure 2 As shown, the display panel includes multiple rows and columns of pixel electrodes disposed on an array substrate, with each pixel electrode corresponding to a pixel unit. Figure 3 As shown, the display panel also includes a common electrode, which includes multiple touch electrodes. Touch signal lines are connected to the touch electrodes, and the touch electrodes are connected to the driver chip through the touch signal lines.

[0060] For example, such as Figure 4 As shown, a common electrode reused as a touch electrode can cover multiple rows and columns of pixel electrodes. For example... Figure 4 In the structure shown, a common electrode covers 2×2 pixel electrodes.

[0061] As an example, the operation of the display panel may also include multiple touch periods during which the display panel provides touch pulses.

[0062] Please combine Figure 5 understand, Figure 5 In this context, TP represents the touch signal transmitted on the touch signal line, and G1 to Gn represent the gate scan signals that are turned on sequentially. Figure 5 The VP, VN, and Vcom signals shown represent the signal states transmitted on the data lines at different stages. Specifically, Figure 5 Taking the nth frame as the positive frame and the (n+1)th frame as the negative frame as an example, VP indicates a positive data voltage signal, VN indicates a negative data voltage signal, and Vcom represents the common voltage value.

[0063] For ease of understanding Figure 5The timing relationships between the signals shown are illustrated with several auxiliary lines to clearly show the time correspondence between the touch pulse (TP) and the scan line signals (e.g., G1, G2, G3, etc.). It can be seen that the touch pulse and the gate scan signal do not overlap in time; that is, the touch pulse occurs outside the display phase.

[0064] The display panel driver chip (IC) may include a data driver unit and a touch driver unit. The data driver unit can provide a data voltage to the data line during the charging period to write data to the pixel, provide a hold period pre-charge voltage to the data line during the first pre-charge period, and provide an interval period pre-charge voltage to the data line during the second pre-charge period. The touch driver unit is used to generate a touch pulse during the touch period and provide the touch signal to the touch signal line.

[0065] As an example, the display panel driver chip can be bonded to the display panel using methods such as COF (Chip On Film) or COG (Chip On Glass). Exemplarily, the display panel driver chip is connected to both the data line and the touch signal line.

[0066] As an example, to reduce the power consumption of the display driver IC, the precharge signal provided to the data line and the touch signal provided to the touch signal line can be time-overlapped. In some embodiments, such as Figure 5 As shown, the interval period may include at least one touch period, and in time, the second precharge period is located within the touch pulse. In some embodiments, the hold period may also include at least one touch period, and in time, the first precharge period is located within the touch pulse.

[0067] In the above embodiments, by outputting both the precharge signal and the touch signal within the same time period, the display driver IC can complete the precharge operation synchronously when performing touch driving, without the need to add an additional precharge time segment, thereby effectively reducing the overall power consumption of the IC.

[0068] Furthermore, as an example, the charging period of the display panel also includes multiple touch periods. Specifically, during the charging period, the display panel alternately performs data writing and touch pulse output processes.

[0069] like Figure 5 As shown, when the scan lines (G1 to Gn) are sequentially turned on to write data voltage to the pixel, a common voltage is provided to the touch electrode (i.e., common electrode) corresponding to the touch signal line; while when the touch signal line provides touch signal to the touch electrode (i.e., common electrode), no conduction pulse voltage is provided on each scan line (G1 to Gn).

[0070] Please see Figure 6In some embodiments, the operation phase of the display panel may include multiple charging periods. The interval period may include a frame start segment between a charging period and a previous adjacent hold period, and a frame end segment between a charging period and a subsequent adjacent hold period.

[0071] The precharge method for the frame start segment can be set independently of the precharge method for the hold period. By using an independent precharge method for the frame start segment, it is possible to prevent over-precharge in the previous frame, which could result in a bright line appearing at the beginning of the next frame. It also helps to adjust the common voltage (Vcom).

[0072] The pre-charge method for the end-of-frame segment can also be set independently of the pre-charge method for the hold period. By setting an independent pre-charge method for the end-of-frame segment, the optimal common voltage (Vcom) for flicker and the optimal common voltage (Vcom) for 127 grayscale can be adjusted separately. Through adjustment, the two Vcom values ​​can be brought closer together, so that both flicker and 127 grayscale are at their optimal values, thereby achieving a better balance between brightness consistency and flicker performance of the display panel.

[0073] In some embodiments, such as Figure 6 As shown, step S300 provides an interval pre-charge voltage to the data line during the second pre-charge period, which may specifically include: providing a first interval pre-charge voltage to the data line in the first frame segment, and / or providing a second interval pre-charge voltage to the data line in the last frame segment.

[0074] As an example, the absolute value of the precharge voltage during the second interval period is greater than or equal to the absolute value of the precharge voltage during the holding period.

[0075] Specifically, in some embodiments, the absolute value of the pre-charge voltage during the second interval period is greater than the absolute value of the pre-charge voltage during the hold period. In this case, performing a higher-amplitude pre-charge in the end-of-frame segment can effectively compensate for the leakage current loss caused by the pixel being held for a long time in low-frequency operating mode, so that the pixel maintains a stable potential before the start of the next frame, thereby effectively improving the display stability and flicker performance of the image.

[0076] In other embodiments, the pre-charge voltage for the second interval period may be the same as the pre-charge voltage for the hold period, i.e., their absolute values ​​are equal. The specific numerical relationship between the pre-charge voltage for the second interval period and the pre-charge voltage for the hold period can be adaptively adjusted according to the characteristic parameters of the display panel, the driving frequency, and the target display effect, and this application does not impose specific limitations on this.

[0077] In some embodiments, the operation phase of the display panel may include multiple charging periods, and the multiple charging periods include alternating first polarity frames and second polarity frames. For example Figure 5As shown, the operation of the display panel includes alternating positive and negative frames. The following example illustrates the case where frame n is a positive frame (i.e., during the charging period of frame n, the data voltage transmitted by the data line is positive) and frame n+1 is a negative frame (i.e., during the charging period of frame n+1, the data voltage transmitted by the data line is negative).

[0078] In this embodiment, the polarity of the pre-charge voltage during the second interval period and the pre-charge voltage during the holding period can both be positive, and the voltage value of the pre-charge voltage during the second interval period can be higher than the voltage value of the pre-charge voltage during the holding period.

[0079] Correspondingly, when the nth frame is a negative frame (i.e., the data voltage transmitted by the data line during the charging period of the nth frame is negative) and the (n+1)th frame is a positive frame (i.e., the data voltage transmitted by the data line during the charging period of the (n+1)th frame is positive), the polarity of the pre-charge voltage during the second interval period and the pre-charge voltage during the holding period can both be negative, and the voltage value of the pre-charge voltage during the second interval period is lower than the voltage value of the pre-charge voltage during the holding period, that is, a negative pre-charge voltage with a larger absolute value is applied in the end segment of the frame.

[0080] In some embodiments, the pre-charge voltage for the first interval period is a ground voltage, or the polarity of the pre-charge voltage for the first interval period is opposite to the polarity of the pre-charge voltage for the second interval period.

[0081] Taking the case where frame n is a positive frame and frame (n+1) is a negative frame as an example, the pre-charge voltage for the second interval in the frame's end segment can be set to a positive pre-charge voltage, while the pre-charge voltage for the first interval in the frame's beginning segment can be set to ground voltage or a negative pre-charge voltage. Similarly, when frame n is a negative frame and frame (n+1) is a positive frame, a negative pre-charge voltage can be set in the frame's end segment, and a ground voltage or a positive pre-charge voltage can be set in the frame's beginning segment to achieve the same potential transition adjustment effect.

[0082] By using a pre-charge method with opposite polarities in the end-of-frame and beginning-of-frame segments, stability during inter-frame polarity reversal can be improved, reducing visual anomalies such as white frames or uneven brightness, thereby further enhancing the flicker performance of the display panel.

[0083] In some embodiments, the waveform of the precharge voltage during the interval of the second precharge period may be different from the waveform of the precharge voltage during the hold period of the first precharge period.

[0084] As an example, the different waveforms can specifically manifest as differences in pulse duration, pulse interval, voltage amplitude, and polarity, which can be adaptively set according to the operating frequency and timing characteristics of the display panel.

[0085] For example, please refer to Figure 7Step S200 provides a hold-up precharge voltage to the data line during the first precharge period, which may specifically include the following steps S211 to S212:

[0086] S211: During the hold period after the first polarity frame, a hold period first precharge voltage is provided to the data line in a first precharge mode.

[0087] S212: During the hold period after the second polarity frame, a second precharge voltage is provided to the data line in the second precharge mode for the hold period.

[0088] It should be noted that the first pre-charge mode and the second pre-charge mode mentioned above can be different, that is, the pre-charge methods of positive frames and negative frames during the holding period are allowed to be different. As for the specific pre-charge voltage, pre-charge voltage polarity, voltage amplitude or waveform, etc., they can be adaptively adjusted according to the characteristics of the display panel, the operating frequency and other actual display requirements, and this application does not make specific limitations in this regard.

[0089] For example, the first precharge voltage may be consistent with the polarity of the first polarity frame (i.e., the positive frame), such as... Figure 5 As shown; the second precharge voltage can be consistent with the polarity of the second polarity frame (i.e., the negative frame). Figure 5 (Not shown).

[0090] Please continue reading. Figure 1 and Figure 6 In some embodiments, the holding period may have multiple first precharge periods.

[0091] For ease of understanding, Figure 6 The dashed box within the hold period illustrates one of the first precharge periods. In some embodiments, the first precharge period may specifically include a plurality of first precharge sub-periods spaced apart, during which a hold period precharge voltage is provided to the data line.

[0092] It should be noted that in the above embodiments, during the interval between adjacent first precharge sub-periods, the data line does not provide the precharge voltage for the holding period, that is, the data line is in a non-precharge state.

[0093] Specifically, please combine Figure 6 and Figure 8 understand, Figure 6 The dashed box within the holding period indicates one of the first pre-charge periods. Figure 8 Figures (a) to (f) are timing diagrams of the first pre-charge period in some embodiments.

[0094] It can be seen that the pre-charge during the maintenance period can be a continuous pre-charge, such as... Figure 8 As shown in Figure (a); it can also be a form of multiple segmented small pre-fillings, such as Figure 8As shown in Figures (b) to (f).

[0095] Figure 8 Figure (b) shows multiple consecutive and equally wide first precharge sub-periods, with the precharge voltage amplitude of each first precharge sub-period being consistent. Figure 8 Figures (c) to (e) all include multiple segments of the first pre-filling sub-time period, but these segments are unevenly distributed. Specifically, compared with... Figure 8 Compared to diagram (b) in the middle, Figure 8 In Figure (c), the first pre-fill sub-period is concentrated in the first half of the hold period. Figure 8 In Figure (d), the first pre-fill sub-period is concentrated in the latter half of the hold period, while Figure 8 In Figure (e), the first pre-fill sub-period is located in the middle of the hold period. Figure 8 Figure (f) in the figure also consists of multiple consecutive and equally wide first precharge sub-periods, with the precharge voltage amplitude of each first precharge sub-period being consistent, but different from... Figure 8 Compared to diagram (b) in the middle, Figure 8 The interval between adjacent first pre-charge sub-time periods in Figure (f) is relatively wide.

[0096] Figure 8 The embodiments shown in Figures (b) to (f) all adopt a segmented pre-charging method, which can flexibly set the pre-charging interval and the duration of each first pre-charging sub-period according to the leakage characteristics of the pixel, so that the pixel can maintain a stable voltage distribution even during a longer holding time, which helps to further suppress the problem of uneven brightness or flickering caused by leakage, thereby improving display stability.

[0097] It should be understood that the number, time interval and duration of the above-mentioned multiple first pre-charge sub-periods can be adaptively set according to display requirements, and this application does not make specific limitations in this regard.

[0098] In some embodiments, the plurality of first pre-charge periods may specifically include a first type of first pre-charge period and a second type of first pre-charge period.

[0099] For example, please refer to Figure 9 and Figure 10 ,in Figure 10 It shows Figure 6 The first precharge period, shown in the dashed box, is the timing diagram in this example.

[0100] In this example, step S200 provides a hold-time pre-charge voltage to the data line during the first pre-charge period, and may further include the following steps S221 to S222:

[0101] S221: During the first pre-charge period of the first type, a third pre-charge voltage is provided to the data line to maintain the charge during the third pre-charge period.

[0102] S222: During the first pre-charge period of the second type, a fourth pre-charge voltage is provided to the data line during the holding period.

[0103] It should be noted that the different types of first pre-charge periods mentioned above can be manifested by different pre-charge voltage parameters, such as different amplitudes or polarities of the pre-charge voltage.

[0104] Please refer to the specific details. Figure 10 understand, Figure 10 The horizontal lines represent time. The third pre-charge voltage of the hold period above the horizontal line indicates that a positive pre-charge voltage is applied to the data line during the first pre-charge period of the first type. The fourth pre-charge voltage of the hold period below the horizontal line indicates that a negative pre-charge voltage is applied to the data line during the first pre-charge period of the second type.

[0105] And combined Figure 10 It can also be understood that the amplitude of the applied third pre-charge voltage during the holding period can be different in different first-type first pre-charge periods; and the amplitude of the applied fourth pre-charge voltage during the holding period can also be different in different second-type first pre-charge periods.

[0106] In the above embodiments, by providing a third pre-charge voltage during the first pre-charge period of the first type and a fourth pre-charge voltage during the second pre-charge period, the display panel can pre-charge using voltages of different polarities or amplitudes during different holding periods. Therefore, the pre-charge voltage parameters can be adjusted for different polarity frames or different pixel characteristics, resulting in more precise adjustment of the voltage difference between the transistor source and drain electrodes, further reducing transistor leakage current, and significantly improving flicker performance and uneven display brightness in low-frequency operating modes.

[0107] In some embodiments, there may be multiple second pre-charge periods within the interval period.

[0108] For ease of understanding, Figure 6 The dashed box within the intermediate interval indicates one of the second precharge periods. In some embodiments, the second precharge period may specifically include a plurality of second precharge sub-periods spaced apart, during which an interval precharge voltage is provided to the data line.

[0109] It should be noted that in the above embodiments, during the interval between adjacent second precharge sub-periods, the data line does not provide the precharge voltage for the holding period, that is, the data line is in a non-precharge state.

[0110] Specifically, please combine Figure 6 and Figure 11 understand, Figure 6The dashed box in the mid-frame end segment indicates one of the second precharge periods. Figure 11 Figures (a) to (f) are timing diagrams of the second pre-charge period in some embodiments.

[0111] It can be seen that pre-charging at intervals can also be a continuous pre-charging process, such as... Figure 11 As shown in Figure (a); it can also be a form of multiple segmented small pre-fillings, such as Figure 11 As shown in Figures (b) to (f).

[0112] Figure 11 Figure (b) shows multiple consecutive and equally wide second precharge sub-periods, with the precharge voltage amplitude of each second precharge sub-period being consistent. Figure 11 Figures (c) to (e) all include multiple segments of the second pre-filling sub-time period, but these segments are unevenly distributed. Specifically, compared with... Figure 11 Compared to diagram (b) in the middle, Figure 11 In Figure (c), the second pre-filling sub-period is concentrated in the first half of the holding period. Figure 11 In Figure (d), the second pre-fill sub-period is concentrated in the latter half of the hold period, while Figure 11 In Figure (e), the second pre-filled sub-period is located in the middle of the holding period. Figure 11 Figure (f) in the figure also consists of multiple consecutive second precharge sub-periods of equal width, with the precharge voltage amplitude of each second precharge sub-period being consistent, but differing from... Figure 11 Compared to diagram (b) in the middle, Figure 11 The interval between adjacent second pre-charge sub-time periods in Figure (f) is relatively wide.

[0113] Figure 11 The embodiments shown in Figures (b) to (f) all adopt a segmented pre-charging method. The pre-charging interval and the duration of each second pre-charging sub-period can be flexibly set according to the leakage characteristics of the pixels, so that the pixels can maintain a more stable voltage distribution, further reduce the uneven brightness and white frame visual abnormality caused by leakage, and improve the overall visual quality of the display.

[0114] In some embodiments, the plurality of second pre-charge periods may specifically include a first type of second pre-charge period and a second type of second pre-charge period.

[0115] For example, please combine Figure 12 and Figure 13 Understandably, step S300 provides the data line with an interval pre-charge voltage during the second pre-charge period, which may specifically include the following steps S311 to S312:

[0116] S311: During the second pre-charge period of the first type, a first pre-charge voltage is provided to the data line during the interval period.

[0117] S312: In the second type of second precharge period, provide the data line with an interval period of second precharge voltage.

[0118] It should be noted that the different types of second pre-charge periods mentioned above can be manifested by different pre-charge voltage parameters, such as different amplitudes or polarities of the pre-charge voltage.

[0119] In some embodiments, a hold-time precharge voltage is provided to the data line during a first precharge period, the duration of which may correspond to the time required to activate a preset number of gate signals.

[0120] In some embodiments, an interval precharge voltage is provided to the data line during a second precharge period, the duration of which may correspond to the time required to activate the gate signal of another preset row number.

[0121] As an example, the precharge duration of the end-of-frame segment can be set to be less than the precharge duration of the hold period. This application does not impose specific limitations on this, as long as effective leakage compensation of pixels can be achieved in low-frequency mode.

[0122] In some embodiments, when the second interval precharge voltage is provided to the data line in the end-of-frame segment, its duration may correspond to the time required to activate a preset number of gate signals. For example, the duration of the second interval precharge voltage provided to the data line in the end-of-frame segment may be set to be equivalent to the duration required to activate three rows of gate signals.

[0123] With the above settings, when providing the second interval precharge voltage to the data line in the end-of-frame segment, the precharge duration is only equivalent to the time required to activate the gate signal for a preset number of rows (e.g., three rows). The resulting leakage current compensation effect is roughly the same as that of a longer precharge duration. Therefore, while ensuring display performance, the end-of-frame precharge time can be appropriately shortened to reduce driving complexity and power consumption.

[0124] It should be noted that the above-mentioned pre-charging of the end-of-frame segment is only an exemplary setting. The number of pre-charging lines and the pre-charging duration can be flexibly adjusted according to the specific display panel design and application requirements. This application does not impose any specific limitations on this.

[0125] It should be noted that, in order to more clearly distinguish the different time periods of the display panel, for example, in combination with Figure 5 It is understood that the judgment can be made based on the timing characteristics of the touch panel signal (TP signal) and the gate scan signal (G1~Gn).

[0126] In some embodiments, the charging period refers to the period during which the signal on the scan line (as the gate signal of the transistor at the pixel position) controls the transistor at the pixel position to turn on, thereby charging the pixel capacitor corresponding to the pixel electrode via the data line; correspondingly, during the interval period, the TP signal is in an active state for touch scanning or signal acquisition; at the same time, the gate scan signal (G1~Gn) is in a cut-off state, the thin film transistor (TFT) of the pixel is turned off, and the display driver enters the preparation stage for the next frame.

[0127] Based on the same inventive concept, this application also provides a display panel driver chip for implementing the above-described display panel driving method. The solution provided by this display panel driver chip is similar to the implementation scheme described in the above-described display panel driving method.

[0128] Please combine Figure 14 It is understood that the display panel 10 involved in this application has at least a first operating mode. In the first operating mode, the operation of the display panel 10 includes a charging period and a holding period. Furthermore, the display panel 10 involved in this application is configured with a scan driving unit for providing a conduction voltage to the scan lines during the charging period.

[0129] The display panel driver chip 20 provided in this application includes a data driver unit 200, which is used to provide a holding period precharge voltage to the data line during a first precharge period and to provide an interval period precharge voltage to the data line during a second precharge period.

[0130] The first pre-charging period is located within the holding period, the second pre-charging period is located within the interval period, and the interval period is located between the charging period and the adjacent holding period.

[0131] The data driving unit 200 of the aforementioned display panel driver chip 20 provides a hold-time pre-charge voltage to the data line during the first pre-charge period of the hold-time period. This enables the pixels to maintain a stable potential state during the hold-time period, reducing the impact of leakage current and thus improving the flicker performance of the display panel 10. For example, in low-frequency operating mode, the hold-time of the pixels increases. Therefore, the aforementioned display panel driver chip 20 improves the flicker performance in low-frequency operating mode by enabling the pixels to obtain a stable potential state during the hold-time period, thereby reducing the impact of leakage current caused by the extended hold-time in low-frequency operating mode.

[0132] Meanwhile, the aforementioned display panel driver chip 20 also provides the data line with the interval pre-charge voltage during the second pre-charge period of the interval period. By performing pre-charging during the hold period and the interval period respectively, the pixels can maintain a stable voltage distribution, thereby effectively reducing the uneven brightness and white frame visual abnormality caused by leakage current, achieving visual optimization of the display screen, and making the white frame area invisible in the display effect.

[0133] The operation of the display panel 10 may further include multiple touch periods. In some embodiments, the display panel driver chip 20 may further include a touch driving unit for generating touch pulses during the touch periods. The interval period includes at least one touch period, and temporally, a second precharge period is located within the touch pulse.

[0134] It should be noted that the display panel driver chip 20 in the embodiments of this application can be used to implement the corresponding display panel driving method. Therefore, the technical features between the method embodiment and the chip embodiment can be substituted and supplemented for each other without conflict, so that those skilled in the art can understand the technical content of this application.

[0135] Based on the same inventive concept, embodiments of this application also provide a display device. Please refer to... Figure 15 The display device 1 includes a display panel 10 and a display panel driver chip provided in the aforementioned embodiments. Figure 15 (Not shown in the image). The specific limitations of the display panel driver chip have been described in detail in the foregoing embodiments and will not be repeated here. The display device 1 can also achieve the technical effects that the aforementioned display panel driver chip can achieve, and will not be described in detail here either.

[0136] For example, the display device 1 can be any electronic device with display function, such as an in-vehicle display device, mobile phone, tablet, computer, smart wearable device (e.g., smartwatch), etc., and the embodiments of this application do not limit it.

[0137] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0138] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0139] The embodiments described above are merely illustrative of several implementations of this application, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display panel driving method, characterized in that, The display panel's operating modes include a first operating mode. In the first operating mode, the display panel's operating process includes a charging period and a holding period. The display panel's operating phases include multiple charging periods. The display panel's driving method includes: During the charging period, a conduction voltage is provided to the scan line; During the first precharge period, a hold-up precharge voltage is provided to the data line, and the first precharge period is located within the hold-up period. During the second precharge period, an interval precharge voltage is provided to the data line. The second precharge period is located within the interval period, which is located between the charging period and the adjacent hold period. The interval period includes the frame start segment between the charging period and the previous adjacent hold period, and the frame end segment between the charging period and the next adjacent hold period. Providing the data line with an interval precharge voltage during the second precharge period includes: A first interval precharge voltage is provided to the data line in the first segment of the frame, and a second interval precharge voltage is provided to the data line in the last segment of the frame. Wherein, the absolute value of the precharge voltage during the second interval period is greater than or equal to the absolute value of the precharge voltage during the holding period period.

2. The display panel driving method according to claim 1, characterized in that, The operation of the display panel also includes multiple touch periods, during which the display panel provides touch pulses; The interval period includes at least one of the touch periods, and in time, the second precharge period is located within the touch pulse.

3. The display panel driving method according to claim 2, characterized in that, The hold period includes at least one of the touch periods, and in time, the first precharge period is located within the touch pulse.

4. The display panel driving method according to claim 1, characterized in that, The pre-charge voltage during the first interval period is the ground voltage, or the polarity of the pre-charge voltage during the first interval period is opposite to the polarity of the pre-charge voltage during the second interval period.

5. The display panel driving method according to claim 1, characterized in that, The waveform of the precharge voltage during the interval of the second precharge period is different from the waveform of the precharge voltage during the holding period of the first precharge period.

6. The display panel driving method according to claim 1, characterized in that, The operation phase of the display panel includes multiple charging periods, and the multiple charging periods include alternating first polarity frames and second polarity frames. The provision of a hold-up precharge voltage to the data line during the first precharge period includes: During the hold period following the first polarity frame, a hold period first precharge voltage is provided to the data line in a first precharge mode; During the hold period following the second polarity frame, a second precharge voltage is provided to the data line in a second precharge mode for the hold period.

7. The display panel driving method according to claim 1, characterized in that, The holding period includes multiple first pre-charge periods.

8. The display panel driving method according to claim 7, characterized in that, The first precharge period includes multiple first precharge sub-periods at intervals, during which the hold period precharge voltage is provided to the data line.

9. The display panel driving method according to claim 7, characterized in that, The multiple first pre-charging periods include a first type of first pre-charging period and a second type of first pre-charging period; The provision of a hold-up precharge voltage to the data line during the first precharge period includes: During the first pre-charge period of the first type, a third pre-charge voltage for the holding period is provided to the data line; During the first pre-charge period of the second type, a fourth pre-charge voltage for the holding period is provided to the data line.

10. The display panel driving method according to claim 1, characterized in that, The interval period includes multiple second pre-charge periods.

11. The display panel driving method according to claim 10, characterized in that, The second precharge period includes multiple second precharge sub-periods at intervals, during which the interval precharge voltage is provided to the data line.

12. The display panel driving method according to claim 10, characterized in that, The multiple second pre-charge periods include a first type of second pre-charge period and a second type of second pre-charge period; Providing the data line with an interval precharge voltage during the second precharge period includes: During the second pre-charge period of the first type, a first pre-charge voltage with an interval period is provided to the data line; During the second precharge period of the second type, a second precharge voltage is provided to the data line at intervals.

13. The display panel driving method according to claim 10, characterized in that, During the first precharge period, the hold period precharge voltage is provided to the data line, and the duration of the first precharge period corresponds to the time required to activate the gate signal of a preset number of rows. The data line is provided with the interval precharge voltage during the second precharge period, the duration of which corresponds to the time required to activate the gate signal of another preset row number.

14. A display panel, characterized in that, The display panel driving method as described in any one of claims 1 to 13 is applied.

15. A display panel driver chip, characterized in that, The display panel has a first working mode. In the first working mode, the working process of the display panel includes a charging period and a holding period. The working phase of the display panel includes multiple charging periods. The display panel is equipped with a scan driving unit for providing a conduction voltage to the scan lines during the charging period. The display panel driver chip includes a data driver unit, which is used to provide a hold period precharge voltage to the data line during a first precharge period and to provide an interval period precharge voltage to the data line during a second precharge period. Wherein, the first pre-charge period is located within the hold period, the second pre-charge period is located within the interval period, the interval period is located between the charging period and the adjacent hold period, and the interval period includes the frame beginning segment between the charging period and the previous adjacent hold period, and the frame end segment between the charging period and the next adjacent hold period; Providing the data line with an interval precharge voltage during the second precharge period includes: A first interval precharge voltage is provided to the data line in the first segment of the frame, and a second interval precharge voltage is provided to the data line in the last segment of the frame. Wherein, the absolute value of the precharge voltage during the second interval period is greater than or equal to the absolute value of the precharge voltage during the holding period period.

16. The display panel driver chip according to claim 15, characterized in that, The operation of the display panel also includes multiple touch-sensitive periods; The display panel driver chip also includes a touch driver unit, which is used to generate touch pulses during the touch period; The interval period includes at least one of the touch periods, and in time, the second precharge period is located within the touch pulse.

17. The display panel driver chip according to claim 16, characterized in that, The hold period includes at least one of the touch periods, and in time, the first precharge period is located within the touch pulse.

18. A display device, characterized in that, The display device includes the display panel as described in claim 16, and the display panel driver chip as described in any one of claims 15 to 17.

Images