A smart driving method and system for a liquid crystal display screen

Abstract

This invention relates to the field of liquid crystal display technology, and more particularly to an intelligent driving method and system for liquid crystal displays. The method includes the following steps: recording the current decay waveform of the source driver charging the pixel capacitor during pixel charging; calculating the charging time constant based on the current decay waveform; calculating the current pixel capacitance value using the charging time constant and the transistor on-resistance; converting the current pixel capacitance value into an orientation angle corresponding to the pixel orientation state; comparing the current orientation angle with the target orientation angle corresponding to the pre-acquired target grayscale, and calculating the orientation angle deviation; and using a driving sequence containing multiple voltage pulses based on the orientation angle deviation. This invention achieves closed-loop precise driving based on pixel state feedback by deriving the pixel capacitance from the current decay and converting it into the pixel orientation state, overcoming the problem of long-term open-loop blind driving in liquid crystal displays.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal display technology, and in particular to an intelligent driving method and system for liquid crystal displays. Background Technology

[0002] In a TFT-LCD, a pixel is essentially a capacitor unit controlled by a thin-film transistor and connected to a data line. During display refresh, the driving circuit sequentially opens the gate of each row, turning on the transistor of that row's pixel. The data line voltage is then applied to the pixel capacitor, and the pixel begins to charge, gradually approaching the target voltage. Subsequently, the gate closes, the transistor turns off, and the pixel capacitor is disconnected from the outside world. The charged voltage is "locked" and maintained at that voltage throughout the entire frame cycle. The pixel orientation changes according to this voltage, thereby modulating the transmittance to form an image. During the holding phase, the pixel voltage slowly decays due to minute leakage current, and parasitic coupling at the moment of shutdown may cause a slight voltage shift. The entire pixel charging process is essentially the process of writing the data voltage into the pixel capacitor in a very short time and then relying on charge retention to achieve a stable display over a relatively long period.

[0003] Traditional LCD screens typically employ preset voltage-grayscale lookup tables or open-loop timing control strategies. This means that the driving voltage and scanning timing for different grayscale levels are determined during factory calibration, and the screen is driven directly according to these fixed parameters during actual operation. However, liquid crystal materials inherently possess significant nonlinearity, hysteresis, and temperature sensitivity. Furthermore, parameters such as pixel capacitance and thin-film transistor threshold voltage can change with manufacturing process deviations, usage time, and environmental conditions. This leads to inconsistent orientation responses from the same driving parameters in different pixels or under different operating conditions, resulting in problems such as grayscale errors, uneven response speeds, image retention, and flickering. Summary of the Invention

[0004] Therefore, the present invention needs to provide an intelligent driving method and system for a liquid crystal display screen to solve at least one of the above-mentioned technical problems.

[0005] To achieve the above objectives, a smart driving method for a liquid crystal display screen includes the following steps: Step S1: During pixel charging, record the current decay waveform when the source driver charges the pixel capacitor, and calculate the charging time constant based on the current decay waveform; use the charging time constant and the transistor on-resistance to calculate the current pixel capacitance value. Step S2: Convert the current pixel capacitance value into the orientation angle corresponding to the pixel orientation state; Step S3: Compare the current orientation angle with the target orientation angle corresponding to the target grayscale to be acquired, and calculate the orientation angle deviation; based on the orientation angle deviation, a driving sequence of multiple voltage pulses is included; Step S4: Apply the first voltage pulse in the driving sequence to the pixel, and remeasure the capacitance value during the next gate scan, thereby converting it into the corresponding remeasured orientation angle; Step S5: Compare the remeasured orientation angle with the preset expected orientation angle and calculate the response deviation; adjust the amplitude and application time of subsequent voltage pulses in the driving sequence according to the response deviation, and remeasure the orientation angle until the orientation angle deviation converges to the preset target range.

[0006] The present invention also provides an intelligent driving system for a liquid crystal display screen, used to execute the intelligent driving method for the liquid crystal display screen as described above, the intelligent driving system for the liquid crystal display screen comprising: The charging characteristic detection module is used to record the current decay waveform when the source driver charges the pixel capacitor during the pixel charging process, calculate the charging time constant based on the current decay waveform, and calculate the current pixel capacitance value using the charging time constant and the transistor on-resistance. The orientation angle conversion module is used to convert the current pixel capacitance value into the orientation angle corresponding to the pixel orientation state. The drive sequence generation module is used to compare the current orientation angle with the target orientation angle corresponding to the pre-acquired target grayscale, calculate the orientation angle deviation, and generate a drive sequence containing multiple voltage pulses based on the orientation angle deviation. The pulse application and state retest module is used to apply the first voltage pulse in the driving sequence to the pixel and retest the capacitance value during the next gate scan, thereby converting it into the corresponding retest orientation angle. The closed-loop correction control module is used to compare the remeasured orientation angle with the preset expected orientation angle and calculate the response deviation; adjust the amplitude and application time of subsequent voltage pulses in the drive sequence according to the response deviation, and remeasure the orientation angle until the orientation angle deviation converges to the preset target range.

[0007] This invention, through the aforementioned steps, introduces a closed-loop adaptive adjustment mechanism based on orientation angle feedback during pixel driving. This allows the actual orientation state of the pixel to no longer depend on fixed driving parameters, but rather to be dynamically corrected based on real-time response results, thereby significantly improving the accuracy and consistency of orientation control. This method, through capacitance retesting and orientation angle mapping, transforms the difficult-to-observe orientation state into quantifiable and calculable parameters, establishing driving adjustment based on real physical responses. This effectively reduces the impact of process discreteness, material aging, and environmental changes on pixel response.

[0008] The driving sequence participates in adjustment in both amplitude and timing dimensions simultaneously. Compared to methods relying solely on single-parameter correction, this approach is more effective in suppressing dynamic issues such as orientation overshoot or response hysteresis, resulting in a smoother and more controllable pixel orientation process. By determining the sign of the response deviation, automatic selection of the adjustment direction is achieved, avoiding repeated trial-and-error adjustments, improving convergence speed, and reducing the number of invalid drives, thus contributing to lower power consumption and thermal load. During multiple pulse iterations, the driving sequence gradually approaches the optimal state, ensuring stable convergence of pixel orientation within the expected angle range, enhancing display uniformity and grayscale consistency. This method requires no additional optical detection hardware, relying primarily on existing driving and electrical measurement structures to achieve feedback control. It boasts high system integration, low implementation cost, and is suitable for high-resolution, large-size, or high-refresh-rate display scenarios.

[0009] Overall, this method achieves fine-grained control of pixel orientation state while ensuring driving stability, providing effective technical support for improving display quality and long-term operational reliability. Attached Figure Description

[0010] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a flowchart illustrating the steps of an intelligent driving method for a liquid crystal display screen according to the present invention. Figure 2 This is a schematic diagram of the pixel arrangement of a liquid crystal display screen in the black state. Figure 3 This is a schematic diagram showing the arrangement of pixels in the middle grayscale of a liquid crystal display screen. Figure 4 This is a schematic diagram of the pixel arrangement of a liquid crystal display screen in the white state. Figure 5 This is a multi-pulse driven liquid crystal molecule tilt angle change process according to one embodiment of the present invention; Figure 6 This is a schematic diagram of a module of an intelligent driving system for a liquid crystal display screen according to the present invention. Detailed Implementation

[0011] The technical method of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0012] Furthermore, the accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor methods and / or microcontroller methods.

[0013] It should be understood that although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0014] To achieve the above objectives, please refer to Figures 1 to 6 This invention provides an intelligent driving method for a liquid crystal display screen, the method comprising the following steps: Step S1: During pixel charging, record the current decay waveform when the source driver charges the pixel capacitor, and calculate the charging time constant based on the current decay waveform; use the charging time constant and the transistor on-resistance to calculate the current pixel capacitance value. Step S2: Convert the current pixel capacitance value into the orientation angle corresponding to the pixel orientation state; Step S3: Compare the current orientation angle with the target orientation angle corresponding to the target grayscale to be acquired, and calculate the orientation angle deviation; based on the orientation angle deviation, a driving sequence of multiple voltage pulses is included; Step S4: Apply the first voltage pulse in the driving sequence to the pixel, and remeasure the capacitance value during the next gate scan, thereby converting it into the corresponding remeasured orientation angle; Step S5: Compare the remeasured orientation angle with the preset expected orientation angle and calculate the response deviation; adjust the amplitude and application time of subsequent voltage pulses in the driving sequence according to the response deviation, and remeasure the orientation angle until the orientation angle deviation converges to the preset target range.

[0015] Furthermore, the calculation of the charging time constant based on the current decay waveform in step S1 includes: When the gate driver turns on the thin-film transistor of a row of pixels, the source driver begins to charge the pixel capacitor through the data line; In one embodiment, during normal scanning of the display panel, the gate driver sequentially applies gate turn-on voltage to each row of pixels according to the row scanning timing. When the gate voltage of the target row reaches the conduction threshold of the thin-film transistor, the thin-film transistor of each pixel in that row enters the conducting state, causing the source driver to form an electrical connection with the pixel capacitor. At this time, the source driver injects charge into the corresponding pixel capacitor through the data line according to the current data voltage output level, thereby causing the pixel capacitor voltage to gradually rise and tend to stabilize.

[0016] For example, in a certain display frame, when the 120th row pixel is selected, the gate driver outputs a high level for one row cycle, and the source driver synchronously outputs the corresponding grayscale data voltage, so that the capacitor of that row pixel completes the charging process within that row cycle.

[0017] It should be noted that this charging process does not change the original display scanning timing; it only introduces current detection during the original charging process and does not affect the normal display driving of the pixels.

[0018] A current sampling circuit is set at the output of the source driver to continuously record the process of the charging current changing with time, which is recorded as the current decay waveform. In one embodiment, a current sampling circuit is connected in series on the output path of the source driver channel. This current sampling circuit may include a sampling resistor, a current mirror, or an integrated current sensing unit, used to convert the instantaneous charging current output by the source driver into an acquireable electrical signal. Simultaneously with the start of pixel charging, the control sampling circuit continuously samples the current signal at a sampling frequency higher than the dynamic rate of pixel charging change, thereby obtaining a data sequence of current changes over time.

[0019] For example, a milliohm sampling resistor can be connected in series in each source output channel, and the voltage signal can be acquired with microsecond time resolution by a high-speed analog-to-digital converter, thereby calculating the transient change curve of the pixel charging current.

[0020] It should be noted that the current sampling circuit is only used to detect the transient current characteristics during the charging process. Its equivalent impedance is designed to have a negligible impact on the source drive output in order to avoid interfering with the final charging voltage of the pixel.

[0021] The charging time constant is extracted by fitting an exponential function to the current decay waveform; In one embodiment, the acquired current decay waveform is considered as a first-order RC response process formed by the pixel capacitor when it is charged through the on-resistance of the thin-film transistor, and the corresponding current change satisfies the exponential decay characteristic. Based on this physical model, the effective interval of the current decay waveform is fitted with an exponential function, and the time constant parameter of the current decay curve with time is obtained by the least squares method or the equivalent parameter estimation method. The time constant reflects the charging dynamic characteristics under the combined action of the pixel capacitor and the on-resistance.

[0022] For example, the sampled current data can be fitted as The corresponding time constant is obtained through numerical fitting in the form of [formula / form]. .

[0023] Determine the on-resistance of the transistor in the source drive channel, and divide the charging time constant by the on-resistance to obtain the current pixel capacitance value.

[0024] In one embodiment, given the known on-resistance parameters of the thin-film transistor corresponding to the source driving channel, the extracted charging time constant is processed with the on-resistance according to the first-order RC circuit formula to calculate the equivalent capacitance value of the pixel capacitor. The transistor on-resistance can be pre-stored as an inherent parameter of the source driving channel and directly invoked during actual operation.

[0025] For example, if the charging time constant of a pixel is measured to be 2 microseconds, and the on-resistance of the thin-film transistor in the source drive channel of that pixel is 10 kiloohms, then the capacitance of that pixel can be calculated to be 200 picofarads.

[0026] Of particular importance is the determination of the transistor on-resistance for the source drive channel: During the initialization phase, several standard pixels with known capacitance values ​​are selected as references; A step voltage is applied to a standard pixel and the charging current waveform is recorded. The average charging time constant is obtained by fitting an exponential function and averaging the waveforms. The on-resistance of the thin-film transistor connected to the pixel is calculated by dividing the measured average charging time constant by the known standard pixel capacitance value, and the on-resistance of the transistor is stored as an inherent parameter of the source drive channel.

[0027] Furthermore, the specific steps of extracting the charging time constant by performing exponential function fitting on the current decay waveform are as follows: The moment when the current reaches its peak value in the current decay waveform is identified as the starting boundary. In one embodiment, after continuous sampling of the pixel charging current is completed, time-series analysis is performed on the collected current change data over time to find the inflection point where the current value changes from rising to falling, and the time corresponding to this inflection point is determined as the current peak time. Since the pixel capacitor begins to charge after the thin-film transistor is turned on, the current rises rapidly in the initial stage. When the pixel capacitor voltage gradually approaches the source output voltage, the charging current reaches its maximum value and then enters the exponential decay stage. Therefore, this peak time can stably identify the starting point of the exponential decay process.

[0028] For example, when sampling the charging current of a certain pixel, it is found that the current reaches its maximum value at 1.2 microseconds and then begins to decrease continuously. The sampling point corresponding to 1.2 microseconds is then determined as the starting boundary of the exponential fitting.

[0029] Starting from the initial boundary, the search proceeds backward. When the rate of change of current is less than the preset rate of change threshold, it is determined that the steady-state region has been entered, and this moment is taken as the termination boundary. In one embodiment, after determining the initial boundary, the rate of change of current between adjacent sampling points is calculated point by point along the time axis. When the rate of change of current is consistently less than a preset rate of change threshold, it is determined that the charging process is basically complete, the pixel capacitance has entered an approximately steady-state range, and the moment when this condition is first met is taken as the termination boundary of exponential fitting. The rate of change threshold is used to characterize that the current decay has become gradual and can be preset according to the system noise level and sampling accuracy.

[0030] For example, when the rate of change of current between several consecutive sampling points is less than 1% of the rate of change of the initial peak current, it can be determined that the current moment has entered the steady state region, and this moment can be taken as the termination boundary.

[0031] The sampled data between the starting boundary and the ending boundary is taken as the effective fitting interval, and the charging time constant is extracted by performing exponential function fitting on the data within the effective fitting interval.

[0032] In one embodiment, after determining the start and end boundaries, the corresponding current sampling data between them is extracted as an effective fitting interval. Based on a first-order RC circuit model of the pixel charging process, the current decay data within this interval is subjected to exponential function fitting to obtain the time constant parameter characterizing the charging dynamics. During the fitting process, the least squares method or equivalent parameter estimation method can be used to ensure that the fitted curve maintains consistency with the actual decay waveform in its overall trend.

[0033] For example, the current data within the effective fitting interval can be fitted as follows: In the form of, Using the initial boundary time as an example, the corresponding charging time constant is obtained through fitting. .

[0034] Furthermore, step S2 includes the following steps: Step S21: During the initialization phase, control the LCD screen to display a completely black state, and measure and record the capacitance value of the first pixel in the completely black state; In one embodiment, during system initialization, the display controller writes data voltages corresponding to the full-black grayscale to all pixels of the liquid crystal display, ensuring the stable orientation of the liquid crystal molecules in a full-black display state. After the display state stabilizes, the capacitance of the target pixel or a selected group of representative pixels is measured according to the aforementioned pixel capacitance measurement method based on the charging current decay waveform, and the measured pixel capacitance value is recorded as the first pixel capacitance value in the full-black state.

[0035] For example, after initialization, the display screen is set to a pure black screen and maintained for several display frame cycles. Then, the capacitance of the pixel located in the center area of ​​the display panel is measured, and the measured capacitance value is stored as the capacitance value of the first pixel.

[0036] It should be noted that the pixel capacitance value in the completely black state is used to characterize the orientation characteristics of liquid crystal molecules in the minimum transmittance state, and it serves as one of the reference points for subsequent orientation angle calibration.

[0037] Step S22: Control the LCD screen to display a full white state, and measure and record the capacitance value of the second pixel in the full white state; In one embodiment, after completing the pixel capacitance measurement in the all-black state, the display controller is controlled to uniformly write the corresponding all-white grayscale data voltage to all pixels of the liquid crystal display screen, so that the liquid crystal molecules enter a stable orientation in the all-white display state. After the display state reaches a steady state, the same capacitance measurement method as in the all-black state is used to measure the pixel capacitance at the same pixel position, and the measured capacitance value is recorded as the second pixel capacitance value in the all-white state.

[0038] For example, after the display screen is switched to a pure white screen and remains stable, the charging current is detected again at the same pixel position that was previously measured, and the obtained capacitance value is stored as the second pixel capacitance value.

[0039] It should be noted that by measuring pixel capacitance under two extreme display states of full black and full white, the effective range of liquid crystal molecule orientation changes can be covered, providing boundary conditions for establishing a complete mapping relationship in the future.

[0040] Step S23: Mark the capacitance value of the first pixel as the corresponding orientation angle of zero degrees, and mark the capacitance value of the second pixel as the corresponding orientation angle of ninety degrees; In one embodiment, after obtaining the first pixel capacitance value in the all-black state and the second pixel capacitance value in the all-white state, a correspondence is established between the two and the predefined orientation angle endpoints, wherein the first pixel capacitance value is defined as the capacitance reference value when the liquid crystal molecule orientation angle is zero degrees, and the second pixel capacitance value is defined as the capacitance reference value when the liquid crystal molecule orientation angle is ninety degrees, thereby completing the endpoint calibration of the capacitance-orientation angle mapping relationship.

[0041] For example, two records can be created in the system storage unit, storing the first pixel capacitance value associated with the orientation angle 0° and the second pixel capacitance value associated with the orientation angle 90°.

[0042] Step S24: Calculate the capacitance value corresponding to the intermediate orientation angle within the range of 0 degrees to 90 degrees according to the preset angle interval, and establish a mapping lookup table from capacitance value to orientation angle; In one embodiment, after the orientation angle endpoints are calibrated, multiple intermediate orientation angle nodes are divided within the orientation angle range of 0 to 90 degrees according to a preset angular interval. Based on the relationship between the first pixel capacitance value and the second pixel capacitance value, a pixel capacitance reference value corresponding to each intermediate orientation angle is calculated, thereby forming a capacitance value to orientation angle mapping table for lookup. The mapping lookup table can be stored in the controller's storage unit for use during operation.

[0043] For example, when the preset angle interval is 5°, multiple orientation angle nodes from 0° to 90° can be generated, and the corresponding capacitance value can be calculated for each node to form a lookup table containing multiple sets of "capacitance value-orientation angle" correspondences.

[0044] Step S25: During actual operation, the measured pixel capacitance value is searched in the mapping lookup table, and the corresponding orientation angle value is obtained through linear interpolation.

[0045] In one embodiment, during normal operation of the display screen, after obtaining the current capacitance value of a certain pixel through charging current attenuation analysis, the capacitance value is compared with each reference capacitance value in the mapping lookup table to determine the adjacent orientation angle interval in which it is located, and linear interpolation is performed on the two orientation angle nodes in the interval to calculate the orientation angle value corresponding to the current pixel capacitance value.

[0046] For example, when the measured pixel capacitance value is between the capacitance values ​​corresponding to 30° and 35° in the mapping lookup table, the current orientation angle of the pixel can be calculated to be approximately 32° through linear interpolation.

[0047] See Figure 2In a fully black LCD display, the pixels exhibit an initial alignment angle of 0°. A layer of liquid crystal molecules fills the space between the upper and lower glass substrates, aligning horizontally along an initial direction. The lower glass substrate houses thin-film transistors (TFTs) with gate (G), source (S), and drain (D), as well as a storage capacitor (Cst) connected to the pixel electrode. The source driver charges the pixel capacitor via a data line, controlling the liquid crystal molecules to maintain a black display. When displaying a fully black image, the liquid crystal molecules align parallel to the polarizer direction, creating maximum photoresistivity and thus displaying black.

[0048] See Figure 3 In a liquid crystal display (LCD), pixels exhibit an orientation angle of approximately 45° in the intermediate grayscale state. The liquid crystal molecules partially rotate relative to their black state, and the angle between the liquid crystal molecules on the upper and lower glass substrates gradually increases to achieve grayscale adjustment. The TFT controller on the lower glass substrate applies a preset voltage to rotate the liquid crystal molecules to the intermediate angle, thus adjusting the light transmittance. When a 50% grayscale image needs to be displayed, the capacitance value is measured and mapped to the orientation angle, causing the liquid crystal molecules to rotate approximately 45° to achieve intermediate grayscale brightness.

[0049] See Figure 4 In a liquid crystal display (LCD) screen, the pixels are aligned at a 90° angle when in a pure white state. The liquid crystal molecules rotate to their maximum angle, maximizing light transmission through the polarizer and creating a white display. The TFTs on the lower glass substrate are driven by a source driver that applies maximum voltage, rotating the liquid crystal molecules to the target steady-state angle of 90°, which is maintained by the storage capacitor Cst. When displaying a pure white image, the liquid crystal molecules align perpendicular to their initial orientation, achieving full light transmission.

[0050] Furthermore, step S3 includes the following steps: Step S31: During the initialization phase, a single step voltage pulse is applied to the pixel, and the change curve of the pixel orientation angle over time is recorded by continuous capacitance measurement. In one embodiment, during system initialization or calibration, the source driver applies a step voltage pulse from a low level to a preset level to a selected pixel, causing a sudden change in the pixel capacitor voltage within a short time, thereby driving the liquid crystal molecules to generate an orientation response. Throughout the entire response process after the step voltage is applied, the pixel capacitance value is repeatedly measured in multiple consecutive gate scan cycles according to the aforementioned capacitance measurement method based on charging current decay, and the capacitance value at each moment is converted into the corresponding orientation angle, thereby forming a response curve of the orientation angle changing with time.

[0051] For example, a step voltage higher than its current gray level can be applied to a pixel during initialization, and the capacitance value of the pixel can be continuously measured in several subsequent display frames to obtain a time curve of its orientation angle gradually changing from the initial state and tending to stabilize.

[0052] Step S32: Perform spectral analysis on the orientation angle variation curve, extract the main frequency components, and calculate the quasi-resonance period; In one embodiment, after obtaining the response curve of the pixel orientation angle changing over time, the time series is subjected to frequency domain analysis, for example, by using discrete Fourier transform or equivalent spectrum analysis to convert the orientation angle change signal from the time domain to the frequency domain, and to identify the dominant frequency component with the highest energy proportion in the spectrum. The dominant frequency reflects the main oscillation or rebound characteristics of the pixel orientation state after being excited, and its corresponding period is defined as the quasi-resonant period of the pixel.

[0053] For example, if a spectrum analysis is performed on the orientation angle variation curve of a pixel and a significant peak is found at a certain frequency, then the period corresponding to that frequency can be taken as the quasi-resonant period of the pixel.

[0054] Step S33: Set half of the quasi-resonance period as the pulse interval reference value.

[0055] In one embodiment, after obtaining the quasi-resonant period of a pixel, half of this period is used as a reference value for the time interval between adjacent voltage pulses in the driving sequence. This ensures that subsequent applied voltage pulses match the natural response rhythm of the pixel's orientation state, thereby improving driving efficiency and reducing orientation overshoot. The pulse interval reference value can be stored as a fixed parameter for generating driving sequences at different target gray levels.

[0056] For example, when the quasi-resonance period of a certain pixel is measured to be 4 milliseconds, then 2 milliseconds is set as the pulse interval reference value corresponding to that pixel.

[0057] Furthermore, step S3 also includes the following steps: Step S34: Compare the current orientation angle with the target orientation angle corresponding to the target grayscale to be acquired, and calculate the orientation angle deviation; In one embodiment, during actual display operation, when a pixel needs to be driven to a certain target grayscale, the target orientation angle corresponding to the target grayscale is first obtained according to the mapping lookup table, and then compared with the currently measured pixel orientation angle. The current orientation angle deviation is calculated by the difference between the two. This orientation angle deviation is used to reflect the gap between the current state of the pixel and the desired display state.

[0058] For example, when the orientation angle corresponding to the target grayscale is 40°, and the currently measured orientation angle is 25°, the orientation angle deviation is 15°.

[0059] Step S35: Determine the number of voltage pulses in the driving sequence based on the magnitude of the orientation angle deviation. Set the amplitude of the first voltage pulse to be higher than the steady-state voltage corresponding to the target gray level, and set the amplitude of subsequent voltage pulses according to the decreasing rule to obtain the voltage pulse amplitude sequence. In one embodiment, based on the calculated orientation angle deviation, the number of voltage pulses required to gradually drive the pixel orientation state to approach the target orientation angle is determined. When the orientation angle deviation is large, a driving sequence containing more pulses is generated; when the deviation is small, only a few pulses are generated. The amplitude of the first voltage pulse in the driving sequence is set to be higher than the steady-state voltage corresponding to the target grayscale to quickly drive the orientation state change, while the amplitude of subsequent voltage pulses gradually decreases according to a decreasing rule to avoid overshoot and achieve fine adjustment.

[0060] For example, when the orientation angle deviation is large, an amplitude sequence containing three voltage pulses can be generated, where the amplitude of the first pulse is significantly higher than the steady-state voltage, and the amplitudes of the second and third pulses decrease sequentially.

[0061] Step S36: Arrange the application times of each voltage pulse amplitude sequence according to the pulse interval reference value to form a driving sequence containing multiple voltage pulses.

[0062] In one embodiment, after determining the amplitude sequence of the voltage pulses, the application time is sequentially assigned to each voltage pulse using the pulse interval reference value as a time reference, ensuring that the time interval between adjacent pulses remains consistent with the reference value, thereby forming a complete multi-pulse driving sequence. The generated driving sequence is then used to actually drive the pixels and combined with subsequent retesting and closed-loop correction steps.

[0063] For example, when the pulse interval reference value is 2 milliseconds and three voltage pulses are generated, the corresponding voltage pulses can be applied sequentially at 0 milliseconds, 2 milliseconds and 4 milliseconds on the time axis.

[0064] Furthermore, in step S35, the amplitude of each voltage pulse is set as follows: During initialization, test pulses of different amplitudes are applied to the pixels, and the response speed and overshoot of the pixel orientation state under each amplitude are recorded. The maximum amplitude with fast response and no overshoot is selected as the amplitude of the first voltage pulse. In one embodiment, during system initialization or calibration, the source driver sequentially applies multiple test voltage pulses with progressively increasing amplitudes to a selected pixel. After each pulse application, the orientation state is converted into an orientation angle through continuous pixel capacitance measurement, and the process of the orientation angle changing over time is recorded. For each test pulse amplitude, the response time required for the pixel orientation state to stabilize and whether overshoot exceeding the stable orientation angle occurs are evaluated to comprehensively determine the driving effect corresponding to that amplitude.

[0065] For example, the pulse amplitude can be gradually increased starting from a lower voltage. When it is found that the orientation angle can approach the stable value in the shortest time without significantly exceeding the stable orientation angle at a certain amplitude, this amplitude is determined as the amplitude of the first voltage pulse.

[0066] Based on the angle of rotation of the pixel orientation state after the first pulse is applied, calculate the additional driving force required to reach the target orientation angle, and set the amplitude of the second voltage pulse to the voltage value corresponding to the additional driving force. In one embodiment, after the first voltage pulse is applied and the orientation angle remeasurement is completed, the remaining angle difference between the current orientation angle of the pixel and the target orientation angle is obtained. Based on the response relationship of the pixel orientation angle to the driving voltage, the driving force required to make up the remaining angle difference is calculated, thereby determining the amplitude of the second voltage pulse. This amplitude is typically smaller than the amplitude of the first pulse, and is used to continue to push the orientation state toward the target orientation angle without causing overshoot.

[0067] For example, when the first pulse rotates the pixel orientation angle by 20° from the initial state, and the target orientation angle is 30°, the corresponding driving voltage is calculated based on the remaining 10° orientation angle deviation, and this is set as the amplitude of the second voltage pulse.

[0068] Starting from the third voltage pulse, the remaining deviation is calculated based on the actual orientation angle measured after the previous pulse is applied, and the current pulse amplitude is set as the driving voltage corresponding to the remaining deviation. In one embodiment, after the second and subsequent voltage pulses are applied and the orientation angle is remeasured, the remaining deviation between the current pixel orientation angle and the target orientation angle is recalculated, and the amplitude of the next voltage pulse is determined based on the driving requirements corresponding to the remaining deviation. As the orientation angle gradually approaches the target value, the set voltage pulse amplitude decreases, thereby achieving fine adjustment of the pixel orientation state.

[0069] For example, when the remaining orientation angle deviation is 3° after the second pulse is applied, the amplitude of the third pulse can be set to a voltage value that is only sufficient to drive the 3° change.

[0070] When the remaining deviation is less than the preset threshold, no further pulses are generated, and the voltage pulse amplitude sequence is completed.

[0071] In one embodiment, after each pulse is applied and the orientation angle measurement is completed, the current remaining orientation angle deviation is compared with a preset convergence threshold. When the remaining deviation is less than the threshold, it is determined that the pixel orientation state has reached the allowable error range of the target orientation angle, thereby stopping the generation of new voltage pulses and ending the amplitude setting process of this driving sequence.

[0072] For example, when the preset convergence threshold is 1°, and the remaining orientation angle deviation measured after a certain pulse is applied is 0.6°, no further voltage pulses will be generated.

[0073] Furthermore, step S4 includes the following steps: Step S41: Apply voltage pulses from the driving sequence to the target pixel via the source driver, start a timer while applying the pulses, and stop applying the pulses when the timer reaches the duration of the pulse. In one embodiment, after the driving sequence is generated, the display controller controls the source driver to output a voltage signal of corresponding amplitude to the data line of the target pixel within the corresponding time window, based on the preset voltage pulse amplitude and duration parameters in the driving sequence. A timer is started simultaneously with the output of the voltage pulse to count the duration of the applied voltage pulse. When the timer reaches the duration corresponding to the pulse, the source driver is controlled to stop outputting the voltage pulse, thereby ensuring that the duration of the voltage pulse is consistent with the driving sequence design.

[0074] For example, when a voltage pulse is set to have an amplitude of V1 and a duration of T1, a timer is started at the same time as the output V1, and the voltage output is immediately turned off after the timer reaches T1.

[0075] Step S42: Wait until the next gate scan cycle arrives, the gate driver turns on the thin film transistor of the pixel in that row, and calculates the capacitance value to obtain the remeasured capacitance value after the pulse is applied; In one embodiment, after the current voltage pulse is applied, pixel capacitance measurement is not performed immediately. Instead, the system waits for the display system to enter the next gate scan cycle. When the gate driver turns on the thin-film transistor containing the row where the target pixel is located, the capacitance of the target pixel is measured again using the aforementioned measurement method based on the charging current decay waveform. The capacitance value obtained in this way reflects the actual change in the pixel orientation state after the voltage pulse is applied.

[0076] For example, after a voltage pulse is applied, wait for the pixel row to be selected in the next display frame, and then perform a complete charging current sampling and time constant calculation on the pixel to obtain the corresponding remeasured capacitance value.

[0077] Step S43: Look up the remeasured capacitance value in the mapping lookup table and obtain the remeasured orientation angle after applying the pulse through linear interpolation.

[0078] In one embodiment, after obtaining the remeasured capacitance value after the applied voltage pulse, this capacitance value is used as an input parameter and compared with the capacitance value to orientation angle mapping lookup table established during the initialization phase to determine the adjacent capacitance interval. Linear interpolation is then performed on the corresponding orientation angle node to calculate the actual orientation angle value of the pixel after the applied voltage pulse. This remeasured orientation angle serves as an important basis for calculating the response deviation in the subsequent closed-loop correction step.

[0079] For example, when the remeasured capacitance value is between the capacitance values ​​corresponding to orientation angles of 45° and 50° in the mapping lookup table, the current pixel orientation angle can be calculated to be approximately 47° through linear interpolation.

[0080] Furthermore, step S5 includes the following steps: Step S51: Compare the orientation angle after applying the pulse with the expected orientation angle, calculate the difference between the two, and obtain the response deviation. The expected orientation angle is specifically the orientation angle value that the pixel orientation state should reach after applying a voltage pulse at a specific position in the driving sequence through actual testing during the initialization phase. In one embodiment, after re-measuring the orientation angle following the applied pulse, the currently obtained orientation angle value is compared pixel-by-pixel with a pre-set expected orientation angle. The difference between the two is calculated and defined as the pixel's response deviation to the current voltage pulse. The expected orientation angle is determined during the initialization phase through actual sample testing: with the display panel in a standard operating environment and initial state, after applying a voltage pulse at a specific position in the driving sequence to the pixel, the target orientation angle value that the liquid crystal molecules or display medium should achieve in the stable state is recorded and stored, serving as a reference for subsequent comparisons.

[0081] For example, in the initialization test, when a pulse with an amplitude of 5V and a duration of 10μs is applied at the 5th pulse position of the driving sequence, the measured stable pixel orientation angle is 32°, and this 32° is taken as the expected orientation angle corresponding to that position; during normal operation, if the remeasured orientation angle is 30°, the response deviation is -2°.

[0082] Step S52: Adjust the amplitude of the next voltage pulse in the drive sequence according to the sign of the response deviation. If the sign of the response deviation is positive, multiply the amplitude by a reduction factor less than 1. If the sign of the response deviation is negative, multiply the amplitude by an enhancement factor greater than 1. In one embodiment, the amplitude of the next voltage pulse to be applied in the driving sequence is adaptively adjusted according to the sign of the response deviation to compensate for the deviation in pixel orientation response. When the response deviation is positive, it indicates that the current orientation angle is greater than the expected orientation angle, and the pixel response to voltage excitation is too strong. In this case, the amplitude of the next voltage pulse is multiplied by a reduction factor less than 1 to reduce the driving intensity. When the response deviation is negative, it indicates that the current orientation angle is less than the expected orientation angle, and the pixel response is insufficient. In this case, the amplitude of the next voltage pulse is multiplied by an enhancement factor greater than 1 to improve the driving capability.

[0083] For example, if the planned amplitude of the next pulse is 4V, when the response deviation is +1.5°, 0.9 can be selected as the reduction factor to adjust the amplitude to 3.6V; when the response deviation is -1.5°, 1.1 can be selected as the enhancement factor to adjust the amplitude to 4.4V.

[0084] Step S53: Adjust the application time of the next voltage pulse in the drive sequence according to the sign of the response deviation. If the sign of the response deviation is positive, the application time will be delayed by a preset time. If the sign of the response deviation is negative, the application time will be advanced by a time. In one embodiment, in addition to adjusting the voltage pulse amplitude, the timing of the application of the next voltage pulse in the driving sequence is fine-tuned based on the sign of the response deviation, thereby further improving the orientation dynamic process. When the response deviation is positive, it indicates that the pixel response is too fast or too strong. By delaying the application time of the next voltage pulse relative to the originally planned time by a preset amount, the orientation evolution speed is slowed down. When the response deviation is negative, it indicates that the pixel response is too slow or insufficient. Therefore, the application time of the next voltage pulse is advanced to accelerate the pixel orientation change.

[0085] For example, if the original plan was to apply the next pulse 20 μs after the start of the current frame, the application time can be delayed to 25 μs if the response deviation is positive, and advanced to 15 μs if the response deviation is negative.

[0086] Step S54: Update the adjusted amplitude value and application time to the driving sequence, apply the next voltage pulse to the pixel, remeasure the capacitance value and convert it into the orientation angle until the orientation angle deviation is less than the preset convergence threshold.

[0087] In one embodiment, the adjusted voltage pulse amplitude value and application time are updated and written into the driving sequence, and the source driver applies the next voltage pulse to the target pixel according to the updated driving sequence. Subsequently, the pixel thin-film transistor is turned on again in the corresponding gate scan cycle to remeasure the pixel capacitance, and the remeasured capacitance value is converted into a new orientation angle value through a mapping relationship. The closed-loop process of "applying pulse - remeasuring orientation angle - calculating response deviation - adjusting driving parameters" is continuously executed until the deviation between the current orientation angle and the expected orientation angle is less than a preset convergence threshold.

[0088] For example, when the preset convergence threshold is 0.2°, if the remeasured orientation angle is 31.9° and the expected orientation angle is 32.0° after multiple iterations, it is considered that the pixel orientation has met the accuracy requirements, and subsequent adjustments are stopped.

[0089] Of particular importance, step S3, when generating the driving sequence, also includes adjustments based on regional differences: The LCD screen's display panel is divided into several rectangular areas according to row and column coordinates; Allocate a region response parameter storage unit for each rectangular region; After step S5 of each display frame is completed, the response deviation values ​​of all pixels in each rectangular area are counted, the average value is calculated, and the average value is stored as a response parameter in the response parameter storage unit of the corresponding area. When generating the corresponding driving sequence for the target pixel, the response parameters of the rectangular region to which the target pixel belongs are read. If the response parameters are negative, the amplitude of all pulses is increased by a preset increase ratio. If the region response parameters are positive, the amplitude of all pulses is decreased by a preset decrease ratio.

[0090] See Figure 5 This illustration shows the gradual change in pixel orientation state under multiple voltage pulse drives as the pixel grayscale transitions from 50 to 200 using the intelligent driving method described in this invention. In this embodiment, the target orientation angle is 75°, and the driving method employs a closed-loop corrected multi-pulse driving sequence.

[0091] At the initial moment The pixel is in a stable orientation state corresponding to the original grayscale 50. At this time, the pixel orientation angle is about 15°, and the corresponding pixel capacitance value is about 2.8pF. This state is the reference state before the transition drive is applied.

[0092] At any moment Apply a first voltage pulse to the pixel The voltage pulse amplitude is higher than the steady-state driving voltage corresponding to the target grayscale, used to quickly push the pixel orientation state away from the original steady-state region. After application, the pixel orientation angle rapidly increases to approximately 35°, the pixel capacitance increases to approximately 3.4pF, and the change in orientation angle... Approximately +20°. This stage demonstrates the "rapid traction" effect of the initial pulse.

[0093] At any moment Apply a second voltage pulse Since the pixel has already undergone a significant orientation change, the amplitude of the second pulse is reduced based on the remaining orientation deviation. This pulse further increases the pixel orientation angle to approximately 58°, with a pixel capacitance of approximately 4.0 pF, and the orientation angle change... Approximately +23°. This stage demonstrates the control characteristics of compensating for driving force based on remaining orientation requirements.

[0094] At any moment Apply a third voltage pulse At this point, the pixel is close to the target orientation range, and the pulse amplitude continues to decrease to suppress the risk of overshoot. After application, the pixel orientation angle reaches approximately 68°, the pixel capacitance is approximately 4.3pF, and the change in orientation angle is... Approximately +10°. This stage demonstrates fine-grained approximation control.

[0095] At any moment Apply a fourth voltage pulse This pulse has the smallest amplitude and is used only to compensate for the remaining minor deviations, bringing the pixel orientation angle to approximately 72° and the pixel capacitance value to approximately 4.5pF, which is very close to the target orientation angle of 75°. At this point, the remaining deviations enter the preset convergence threshold range, and the drive sequence terminates.

[0096] As can be seen from the above multi-pulse progressive driving process, the pixel orientation state is not achieved in one step by a single voltage jump. Instead, under a closed-loop detection and correction mechanism, the amplitude and timing of subsequent pulses are dynamically adjusted based on the capacitance retest results after each pulse, thus achieving progressive approximation control of the pixel orientation state. This method can significantly improve the grayscale transition speed, avoid overshoot and oscillation caused by traditional step driving, and ensure the final orientation accuracy.

[0097] See Figure 6 The present invention also provides an intelligent driving system 100 for a liquid crystal display screen, used to execute the intelligent driving method for a liquid crystal display screen as described above, the intelligent driving system 100 for the liquid crystal display screen comprising: The charging characteristic detection module 101 is used to record the current decay waveform when the source driver charges the pixel capacitor during the pixel charging process, calculate the charging time constant based on the current decay waveform, and calculate the current pixel capacitance value using the charging time constant and the transistor on-resistance. The orientation angle conversion module 102 is used to convert the current pixel capacitance value into the orientation angle corresponding to the pixel orientation state; The drive sequence generation module 103 is used to compare the current orientation angle with the target orientation angle corresponding to the pre-acquired target grayscale, calculate the orientation angle deviation, and generate a drive sequence containing multiple voltage pulses based on the orientation angle deviation. The pulse application and state retesting module 104 is used to apply the first voltage pulse in the driving sequence to the pixel and retest the capacitance value during the next gate scan, thereby converting it into the corresponding retesting orientation angle. The closed-loop correction control module 105 is used to compare the remeasured orientation angle with the preset expected orientation angle and calculate the response deviation; adjust the amplitude and application time of subsequent voltage pulses in the drive sequence according to the response deviation, and remeasure the orientation angle until the orientation angle deviation converges to the preset target range.

[0098] Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the application are intended to be included within the invention.

[0099] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A smart driving method for a liquid crystal display screen, characterized in that, Includes the following steps: Step S1: During pixel charging, record the current decay waveform when the source driver charges the pixel capacitor, and calculate the charging time constant based on the current decay waveform; use the charging time constant and the transistor on-resistance to calculate the current pixel capacitance value. Step S2: Convert the current pixel capacitance value into the orientation angle corresponding to the pixel orientation state; Step S3: Compare the current orientation angle with the target orientation angle corresponding to the target grayscale to be acquired, and calculate the orientation angle deviation; based on the orientation angle deviation, a driving sequence of multiple voltage pulses is included; Step S4: Apply the first voltage pulse in the driving sequence to the pixel, and remeasure the capacitance value during the next gate scan, thereby converting it into the corresponding remeasured orientation angle; Step S5: Compare the remeasured orientation angle with the preset expected orientation angle and calculate the response deviation; adjust the amplitude and application time of subsequent voltage pulses in the driving sequence according to the response deviation, and remeasure the orientation angle until the orientation angle deviation converges to the preset target range.

2. The intelligent driving method for a liquid crystal display screen according to claim 1, characterized in that, Step S1, which calculates the charging time constant based on the current decay waveform, includes: When the gate driver turns on the thin-film transistor of a row of pixels, the source driver begins to charge the pixel capacitor through the data line; A current sampling circuit is set at the output of the source driver to continuously record the process of the charging current changing with time, which is recorded as the current decay waveform. The charging time constant is extracted by fitting an exponential function to the current decay waveform; Determine the on-resistance of the transistor in the source drive channel, and divide the charging time constant by the on-resistance to obtain the current pixel capacitance value.

3. The intelligent driving method for a liquid crystal display screen according to claim 2, characterized in that, The specific steps for extracting the charging time constant by fitting the current decay waveform using an exponential function are as follows: The moment when the current reaches its peak value in the current decay waveform is identified as the starting boundary. Starting from the initial boundary, the search proceeds backward. When the rate of change of current is less than the preset rate of change threshold, it is determined that the steady-state region has been entered, and this moment is taken as the termination boundary. The sampled data between the starting boundary and the ending boundary is taken as the effective fitting interval, and the charging time constant is extracted by performing exponential function fitting on the data within the effective fitting interval.

4. The intelligent driving method for a liquid crystal display screen according to claim 3, characterized in that, Step S2 includes the following steps: Step S21: During the initialization phase, control the LCD screen to display a completely black state, and measure and record the capacitance value of the first pixel in the completely black state; Step S22: Control the LCD screen to display a full white state, and measure and record the capacitance value of the second pixel in the full white state; Step S23: Mark the capacitance value of the first pixel as the corresponding orientation angle of zero degrees, and mark the capacitance value of the second pixel as the corresponding orientation angle of ninety degrees; Step S24: Calculate the capacitance value corresponding to the intermediate orientation angle within the range of 0 degrees to 90 degrees according to the preset angle interval, and establish a mapping lookup table from capacitance value to orientation angle; Step S25: During actual operation, the measured pixel capacitance value is searched in the mapping lookup table, and the corresponding orientation angle value is obtained through linear interpolation.

5. The intelligent driving method for a liquid crystal display screen according to claim 4, characterized in that, Step S3 includes the following steps: Step S31: During the initialization phase, a single step voltage pulse is applied to the pixel, and the change curve of the pixel orientation angle over time is recorded by continuous capacitance measurement. Step S32: Perform spectral analysis on the orientation angle variation curve, extract the main frequency components, and calculate the quasi-resonance period; Step S33: Set half of the quasi-resonance period as the pulse interval reference value.

6. The intelligent driving method for a liquid crystal display screen according to claim 5, characterized in that, Step S3 also includes the following steps: Step S34: Compare the current orientation angle with the target orientation angle corresponding to the target grayscale to be acquired, and calculate the orientation angle deviation; Step S35: Determine the number of voltage pulses in the driving sequence based on the magnitude of the orientation angle deviation. Set the amplitude of the first voltage pulse to be higher than the steady-state voltage corresponding to the target gray level, and set the amplitude of subsequent voltage pulses according to the decreasing rule to obtain the voltage pulse amplitude sequence. Step S36: Arrange the application times of each voltage pulse amplitude sequence according to the pulse interval reference value to form a driving sequence containing multiple voltage pulses.

7. The intelligent driving method for a liquid crystal display screen according to claim 6, characterized in that, In step S35, the amplitude of each voltage pulse is set as follows: During initialization, test pulses of different amplitudes are applied to the pixels, and the response speed and overshoot of the pixel orientation state under each amplitude are recorded. The maximum amplitude with fast response and no overshoot is selected as the amplitude of the first voltage pulse. Based on the angle of rotation of the pixel orientation state after the first pulse is applied, calculate the additional driving force required to reach the target orientation angle, and set the amplitude of the second voltage pulse to the voltage value corresponding to the additional driving force. Starting from the third voltage pulse, the remaining deviation is calculated based on the actual orientation angle measured after the previous pulse is applied, and the current pulse amplitude is set as the driving voltage corresponding to the remaining deviation. When the remaining deviation is less than the preset threshold, no further pulses are generated, and the voltage pulse amplitude sequence is completed.

8. The intelligent driving method for a liquid crystal display screen according to claim 7, characterized in that, Step S4 includes the following steps: Step S41: Apply voltage pulses from the driving sequence to the target pixel via the source driver, start a timer while applying the pulses, and stop applying the pulses when the timer reaches the duration of the pulse. Step S42: Wait until the next gate scan cycle arrives, the gate driver turns on the thin film transistor of the pixel in that row, and calculates the capacitance value to obtain the remeasured capacitance value after the pulse is applied; Step S43: Look up the remeasured capacitance value in the mapping lookup table and obtain the remeasured orientation angle after applying the pulse through linear interpolation.

9. The intelligent driving method for a liquid crystal display screen according to claim 8, characterized in that, Step S5 includes the following steps: Step S51: Compare the orientation angle after applying the pulse with the expected orientation angle, calculate the difference between the two, and obtain the response deviation. The expected orientation angle is specifically the orientation angle value that the pixel orientation state should reach after applying a voltage pulse at a specific position in the driving sequence through actual testing during the initialization phase. Step S52: Adjust the amplitude of the next voltage pulse in the drive sequence according to the sign of the response deviation. If the sign of the response deviation is positive, multiply the amplitude by a reduction factor less than 1. If the sign of the response deviation is negative, multiply the amplitude by an enhancement factor greater than 1. Step S53: Adjust the application time of the next voltage pulse in the drive sequence according to the sign of the response deviation. If the sign of the response deviation is positive, the application time will be delayed by a preset time. If the sign of the response deviation is negative, the application time will be advanced by a time. Step S54: Update the adjusted amplitude value and application time to the driving sequence, apply the next voltage pulse to the pixel, remeasure the capacitance value and convert it into the orientation angle until the orientation angle deviation is less than the preset convergence threshold.

10. An intelligent driving system for a liquid crystal display screen, characterized in that, For performing the intelligent driving method for a liquid crystal display screen as described in claim 1, the intelligent driving system for the liquid crystal display screen includes: The charging characteristic detection module is used to record the current decay waveform when the source driver charges the pixel capacitor during the pixel charging process, calculate the charging time constant based on the current decay waveform, and calculate the current pixel capacitance value using the charging time constant and the transistor on-resistance. The orientation angle conversion module is used to convert the current pixel capacitance value into the orientation angle corresponding to the pixel orientation state; The drive sequence generation module is used to compare the current orientation angle with the target orientation angle corresponding to the pre-acquired target grayscale, calculate the orientation angle deviation, and generate a drive sequence containing multiple voltage pulses based on the orientation angle deviation. The pulse application and state retest module is used to apply the first voltage pulse in the driving sequence to the pixel and retest the capacitance value during the next gate scan, thereby converting it into the corresponding retest orientation angle. The closed-loop correction control module is used to compare the remeasured orientation angle with the preset expected orientation angle and calculate the response deviation; adjust the amplitude and application time of subsequent voltage pulses in the drive sequence according to the response deviation, and remeasure the orientation angle until the orientation angle deviation converges to the preset target range.

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