Optical system control method for reducing VR dynamic blur

Abstract

The application relates to the technical field of virtual reality optical systems, and discloses an optical system control method for reducing VR dynamic blur, which comprises the following steps: arranging an independent liquid crystal light valve in the light path of a display panel, and determining the motion state of the user according to the head motion angular velocity obtained by an inertial measurement unit; when being in a static micro-motion state, the light valve is controlled to be continuously opened; and when being in a dynamic operation state, the light valve is controlled to perform a pulse type switching operation once in each display cycle; the application separates the image generation and the time domain light flux control function in structure, so that the display panel can be focused on efficient imaging, and the dynamic blur can be accurately inhibited by the external light valve; the design effectively avoids the inherent contradiction between power consumption and brightness in the prior art, and can significantly improve the environmental adaptability and the comprehensive experience of the user through closed loop self-calibration and multi-sensory collaborative control.

Description

Technical Field

[0001] The present invention relates to an optical system control method for reducing VR dynamic blur, and belongs to the technical field of virtual reality optical systems. Background Art

[0002] Currently, in the field of virtual reality head-mounted display devices, in order to effectively suppress motion blur caused by the user's head movement and improve visual clarity, the industry generally adopts a low-afterglow display technology. Its core is to shorten the effective display time of each frame by inserting black images between frames to cut off the human eye's visual persistence. This is an effective strategy under traditional optical solutions.

[0003] However, as virtual reality devices have evolved towards thinner and lighter forms in recent years, folded light path optical systems with extremely low light efficiency, namely Pancake optical solutions, have gradually become the mainstream choice in the industry. Although this optical solution significantly optimizes the size and weight of the device, its light transmission rate of less than 20% creates a profound and irreconcilable inherent contradiction with low-afterglow display technology at the physical principle level. The reason is that in low-afterglow mode, the effective light emission time of the display panel is greatly compressed. To maintain acceptable viewing brightness, the panel must be driven at an instantaneous peak power several times that of conventional mode. However, the Pancake optical solution dissipates most of the light energy within the system, which exponentially amplifies the power consumption cost of achieving dynamic and clear vision, ultimately pushing the entire display optical system into a dilemma.

[0004] Specifically, the existing technology has the following deficiencies: 1. The structural dilemma of system energy efficiency, that is, the display panel is forced to bear the time-domain luminous flux modulation function, which it is not good at and is costly, resulting in a large amount of ineffective energy consumption, which seriously restricts the battery life of mobile devices; 2. The fundamental compromise of visual experience, that is, the designer must make a trade-off between dynamic clarity, picture brightness and system power consumption, and cannot provide users with the best visual experience in all scenarios. Especially in applications that require frequent switching between static and dynamic, the sense of fragmentation in the experience is particularly prominent. Therefore, how to achieve high clarity in dynamic scenes and high-brightness stable display in static scenes while adopting optical solutions with lower light efficiency such as Pancake without relying on the display panel itself for high-cost time-domain modulation, and structurally resolve the inherent contradiction between power consumption and performance, has become the technical problem to be solved by the present invention. Summary of the Invention

[0005] The present invention provides an optical system control method for reducing VR motion blur. Its main purpose is to solve the problem of how to avoid requiring the display panel to bear the high cost of time domain modulation function through a new system control method when adopting an optical solution with low light efficiency, thereby structurally resolving the inherent contradiction between dynamic clarity and system power consumption.

[0006] To achieve the above object, the present invention provides an optical system control method for reducing VR motion blur, the method comprising the following steps:

[0007] Step a, instructing the display panel in the virtual reality device to operate in a continuous lighting mode;

[0008] Step b: continuously acquiring angular velocity data representing the user's head movement from an inertial measurement unit of the virtual reality device;

[0009] Step c, based on an angular velocity threshold, determining the acquired angular velocity data as corresponding to a stationary micro-motion state or a dynamic operation state;

[0010] In step d, based on the determination result of step c, a liquid crystal light valve that is independent of the display panel and located in its optical path is asynchronously controlled: if the determination result is a stationary micro-motion state, the liquid crystal light valve is controlled to maintain a fully open transparent state during the frame display period of the display panel; if the determination result is a dynamic operation state, the liquid crystal light valve is controlled to perform a pulse operation of opening and closing once during each frame display period of the display panel.

[0011] Preferably, in the pulse operation, the duration of the opening of the liquid crystal light valve is less than one quarter of the frame display period; after the end of the duration of the opening, the liquid crystal light valve switches to a closed, opaque state during the remaining time of the frame display period.

[0012] Preferably, a self-calibration step for compensating for the response delay of the liquid crystal light valve is further included, which step comprises: sending a square wave drive signal with a certain frequency and duty cycle to the liquid crystal light valve at a non-visual perception timing; using an eye-tracking camera in a virtual reality device to capture the light signal response waveform passing through the liquid crystal light valve; calculating the physical response delay of the liquid crystal light valve by comparing the square wave drive signal and the light signal response waveform; generating a compensation time amount, and adjusting the timing of issuing the opening and closing instructions in the pulse operation according to the compensation time amount.

[0013] Preferably, a comfort adjustment step based on motion disorder is also included, which includes: establishing a historical data queue for storing angular velocity data in the past time period; calculating the information entropy of the data sequence in the historical data queue as an indicator for quantifying the motion disorder; if the information entropy exceeds a comfort index threshold, rendering a dark corner with a gradient boundary in the peripheral area of ​​the display screen, and the range and opacity of the dark corner increase according to the value of the information entropy exceeding the comfort index threshold.

[0014] Preferably, when the determination result of step c switches from the static micro-motion state to the dynamic running state, a visual state smooth transition step is executed, which includes: calling the microphone of the virtual reality device to collect the audio stream of the current environment; calculating one or more sound field characteristic parameters based on the audio stream; determining a transition duration based on the sound field characteristic parameters; , the calculation of transition duration follows the following relationship: ,in, The transition duration of this switch; It is a fixed basic transition duration; is an influence coefficient; is a quantitative value of the sound field instability calculated based on the sound field characteristic parameters; within the transition period, the opening time of the liquid crystal light valve is linearly shortened from the full frame time to the target opening time of the pulse-pure operation.

[0015] Preferably, when the information entropy falls below the comfort index threshold, dark corners with gradual boundaries are removed.

[0016] Preferably, the non-visual perception timing is the period when the eye tracking camera detects the complete blinking process of the user or the black screen period when the virtual reality system switches scenes.

[0017] Preferably, the optical system adopts a Pancake optical solution, and the liquid crystal light valve is arranged between the display panel and the lens group of the Pancake optical solution.

[0018] Preferably, the sound field characteristic parameters include the spectrum centroid and the zero-crossing rate; the influence coefficient The value of is determined by referring to a mapping table stored in the device according to the sound field characteristic parameters, and the mapping table makes the stable sound field environment correspond to the larger Value, dynamic sound field environment corresponds to smaller value.

[0019] Preferably, the angular velocity threshold is set to a value within the range of 3 degrees / second to 10 degrees / second.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention structurally changes the traditional operating mode of VR optical systems. By introducing a liquid crystal light valve that is independent of the display panel and asynchronously controlled by the motion state, it separates the image generation function from the time-domain luminous flux control function in terms of working mechanism. This design allows the display panel to continuously operate in its more energy-efficient mode to focus on image display, while the suppression of motion blur is completed by an external optical valve with lower power consumption. Its function is to avoid the constraints brought about by the existing technology that forces the display panel to operate in a high-power mode to suppress motion blur. When adopting optical solutions with lower light efficiency such as Pancake, the system can present bright and stable image quality in static scenes, and provide a clear and ghost-free visual experience in dynamic scenes.

[0022] 2. The present invention also establishes a closed-loop self-calibration mechanism based on active optical detection. By utilizing existing hardware inside devices such as eye-tracking cameras at times that are not easily perceived by users, the actual light signal response waveform of the liquid crystal light valve under a standard drive signal is captured. By comparing the command signal with the actual response signal, the system can calculate the response delay of the light valve caused by physical factors such as temperature changes or device aging, and generate a compensation amount to adjust the timing of issuing control commands. Through closed-loop feedback, the system can adjust according to changes in the physical characteristics of the light valve, ensuring the performance consistency and reliability of the dynamic blur suppression effect under different environmental conditions and product life cycle.

[0023] 3. The present invention further expands single motion perception to include consideration and regulation of the user's comprehensive experience. On the one hand, when the user switches between motion states, the method can incorporate the audio stream characteristics of the current environment as a basis for judgment, and determine the duration of a smooth transition based on the dynamic or stable characteristics of the sound field environment, thereby transforming the mode switching that may cause visual abruptness into a more natural gradual process. On the other hand, the method can identify motion patterns that may cause discomfort by analyzing the disorder of the user's head movement history data. Without affecting the light valve control logic, it can also render soft dark corners around the image to actively reduce the potential risk of motion sickness. This organic synergy of motion sensing, sound field perception, and visual adjustment methods has established a multi-dimensional control system from bottom-level image quality optimization to high-level comfort assurance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram of the optical system control method for reducing VR motion blur according to the present invention;

[0025] Figure 2 This is a curve diagram comparing the system power consumption of the two operating modes of the present invention at different angular velocities;

[0026] Figure 3 This is a flow chart of the optical system control method for reducing VR motion blur in the present invention.

[0027] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The present invention provides an optical system control method for reducing VR motion blur. The system configuration comprises: an independent liquid crystal light valve is arranged in the optical path of a display panel of a virtual reality device. The light transmittance state of the light valve is managed by a control unit, which is coupled to an inertial measurement unit to receive real-time user head motion data. The system architecture physically separates the image generation function from the time-domain light flux control function, allowing the display panel to operate continuously in a high-efficiency continuous lighting mode, while motion blur suppression is performed asynchronously by the liquid crystal light valve based on the user's motion state.

[0030] The physical structure of the system of the present invention is that the optical path structure of its optical core module includes a display panel, a liquid crystal light valve and a pancake lens group arranged in sequence along the central optical axis, wherein the liquid crystal light valve serves as an independent time-domain light flux modulation element and is composed of ferroelectric liquid crystal or blue phase liquid crystal material with a response time limited to within 1.5 milliseconds. Its physical response time is defined as the sum of the on time for the light flux to rise from 10% to 90% of the steady-state value and the off time for the light flux to fall from 90% to 10% after the device receives a driving signal; the pancake lens group is composed of a lens integrated with a reflective polarizing film and a quarter-wave plate, and another lens with a semi-transparent and semi-reflective film layer, which is used to fold the light path to achieve miniaturization of the device.

[0031] In applications such as high-fidelity simulation training or first-person interaction, which require frequent switching between static and detailed observation and intense dynamic response, to address the technical challenges of existing technologies in visual clarity, image brightness, and system power consumption, this solution implements the following control process: When the user is in a static and slightly moving state, such as staring at the instrument panel readings in a virtual cockpit, the system instructs the display panel to operate in a continuous lighting mode. In this mode, the display panel pixels are continuously illuminated throughout the entire frame display cycle to maximize the light flux; accordingly, the liquid crystal light valve located in its optical path is controlled to maintain a fully open and transparent state, without attenuating the optical path, so as to provide high-brightness display in the static and slightly moving state, facilitating the reading of static information.

[0032] To accurately capture the transition from static observation to dynamic tracking, the system continuously acquires angular velocity data representing the user's head movement from the VR device's inertial measurement unit at a frequency of, for example, no less than 250 Hz. This data stream is transmitted in real time to the control unit via an internal bus. To distinguish the user's physiological tremors or unconscious swaying from actual tracking intentions, the system determines whether the acquired angular velocity data corresponds to a static micro-motion state or a dynamic operation state based on an angular velocity threshold. The angular velocity threshold is set through a deterministic calibration procedure. This procedure includes: in a controlled environment, presenting the subject with a visual target moving along a specific trajectory and gradually increasing their visual angular velocity. Simultaneously, the subject's eye tracking state is monitored using an eye-tracking device. When smooth tracking begins to give way to discontinuous saccadic movements, the head angular velocity at that moment is recorded, and this critical value, for example, a value set in the range of 3 degrees / second to 10 degrees / second, is used as the angular velocity threshold. This procedure provides an objective perceptual psychology basis for setting the threshold, thereby reducing the probability of false mode switching.

[0033] When the instantaneous value of the angular velocity of the user's head exceeds the angular velocity threshold, the system's judgment result is to switch from a static micro-motion state to a dynamic operation state; based on this judgment result, the control unit asynchronously controls the liquid crystal light valve, and performs a pulse operation synchronized with the start time of each frame display cycle of the display panel. Specifically, the pulse operation drives the liquid crystal light valve to switch from a closed opaque state to an open transparent state, and its open duration is set to less than one-quarter of the frame display cycle; after the open duration ends, the liquid crystal light valve is immediately switched back to a closed opaque state and maintained in this state until the start of the next frame cycle; by compressing the effective exposure time of each frame to a short window, this method suppresses the visual persistence of moving images on the user's retina, thereby reducing motion blur. In this way, the improvement of dynamic clarity is achieved by the liquid crystal light valve with lower power consumption, avoiding the technical burden of forcing the display panel to drive at high instantaneous peak power.

[0034] Example 1: In a virtual reality control system for remote operation of heavy equipment in hazardous environments, the present technical solution operates as follows; the system requires the operator to operate a physical excavator in a virtual cockpit. This scenario has dual requirements for visual presentation, namely, a bright image is required when observing static instruments in the cockpit, and a clear field of view without smear is required when monitoring external fast-moving body parts; when the operator's line of sight is focused on the control panel in the virtual cockpit to check parameters, the angular velocity of his head movement is determined by the inertial measurement unit to be lower than a preset angular velocity threshold, and the system operates in a stationary micro-motion state; in this state, the display panel operates in a continuous lighting mode, providing a constant luminous flux for the optical link. At the same time, the independent liquid crystal light valve is controlled to maintain a fully open and transparent state, and no modulation is applied to this luminous flux. The image transmitted to the operator's eyes via the Pancake optical solution maintains the brightness of recognizable fine information.

[0035] When the operator rapidly turns their head to track an external target, causing the angular velocity data to exceed the angular velocity threshold, the system switches to dynamic operation. During this process, the display panel maintains its operating mode, continuing to operate in continuous illumination mode, while the control unit instructs the liquid crystal light valve to perform pulsed operation. Within each frame display cycle, the liquid crystal light valve performs a switching operation with an opening duration less than one-quarter of the frame display period. In this way, the temporal luminous flux modulation function is performed by an independent external optical valve. Motion blur reduction no longer requires changing the operating mechanism of the core light-emitting device, thus circumventing the inherent power consumption and brightness constraints faced by traditional low-afterglow technologies using pancake optical solutions. This mechanism enables the output mode of the optical system to correspond in real time to the operator's head movement profile, and the visual effect switches between static highlight and dynamic clarity according to the movement state. During operation, no matter how the operator's gaze shifts between the instruments in the cabin and the external environment, the visual information obtained maintains the clarity of the corresponding state, aiming to provide the operator with clearer visual information in the corresponding state. The system physically separates image generation and time-domain luminous flux control, allowing both functional components, the display panel and the liquid crystal light valve, to operate within their respective optimized operating ranges. The overall power consumption of the system is therefore effectively controlled, thereby extending the sustainable operation time of mobile virtual reality equipment on industrial sites after a single charge.

[0036] Example 2: In order to quantitatively characterize the comprehensive performance of the optical system control method of the present invention in terms of dynamic blur suppression, image brightness maintenance and system power consumption control, a test platform consisting of a programmable rotating pan-tilt head, a high dynamic range luminance meter, a high-precision power analyzer and a high-speed industrial camera was constructed; the platform fixed a Pancake optical VR headset that integrated the independent liquid crystal light valve of the present invention on the rotating pan-tilt head to reproduce the angular velocity of the user's head movement, and the high-speed camera, luminance meter and power analyzer synchronously recorded its dynamic image response time, eyepiece center brightness and overall system power consumption.

[0037] The experiment set up two operating modes for comparison. The first was a control group, which used low-persistence display technology. The display panel itself was driven in pulse mode and the instantaneous power was increased to compensate for brightness. The second was a solution group based on the present invention. The display panel operated in continuous light emission mode, and an independent external liquid crystal light valve performed asynchronous pulse operation based on angular velocity data. In this solution, the angular velocity threshold for state determination was set to 5 degrees / second. This setting aims to balance the visual system's immediate response to motion with its insensitivity to physiological tremors. The angular velocity test sequence of the experiment covered the range of 0 degrees / second to 120 degrees / second. In the experiment, the pan-tilt head drove the VR headset at a preset angular velocity and operated stably at various speed steps to collect data. The key performance indicators of the two operating modes are recorded in Table 1.

[0038] Table 1: Comparison of performance indicators of the two operating modes at different angular velocities.

[0039]

[0040] The data in Table 1 shows that in a stationary, micro-motion state of less than 5 degrees / second, the system power consumption of the solution group of the present invention is lower than that of the control group, while the center brightness is approximately 60% higher. When the angular velocity exceeds the threshold and enters a dynamic operation state, the dynamic blur index of the solution group of the present invention is at a similar level to that of the control group, while its system power consumption at 120 degrees / second is only about 55% of that of the control group, and its center brightness still has an advantage. This data phenomenon arises from the structure of the solution of the present invention. That is, by separating the time domain modulation function from the display panel, the system can suppress dynamic blur without significantly increasing the instantaneous drive power of the display panel.

[0041] Example 3: This example combines Figures 1 to 3 , the optical system control method for reducing VR motion blur is described. Figure 1As shown in the figure, the core control process and auxiliary control system of the optical system control method for reducing VR motion blur are shown. The core control process includes the inertial measurement unit (IMU) continuously acquiring the angular velocity data of the user's head movement, and then determining the motion state. According to the angular velocity threshold, it is determined to be a static micro-motion state or a dynamic operation state. In the static micro-motion state, the liquid crystal light valve maintains full opening within the frame period to provide a high-brightness display. In the dynamic operation state, the liquid crystal light valve performs pulse switching within each frame period to suppress motion blur. The display panel operates in a constant light-emitting mode. The liquid crystal light valve is independent of the display panel and is responsible for time-domain light flux modulation. Finally, The optical system output through the Pancake lens group presents optimized vision; the auxiliary control system includes a closed-loop self-calibration mechanism to compensate for the physical response delay of the liquid crystal light valve, the eye-tracking camera captures the light signal response waveform, and the standard drive signal is used to send a square wave signal to the light valve, thereby generating a compensation time amount to adjust the timing of issuing instructions in the pulse operation; the auxiliary control system also includes a historical data queue to store angular velocity data in the past time period, and adjust the comfort level based on the motion disorder to reduce the potential risk of motion sickness. The motion disorder is quantified and the discomfort risk is evaluated by calculating the information entropy. If the information entropy exceeds the threshold, soft dark corners are rendered.

[0042] like Figure 2 As shown in the figure, the system power consumption (W) of the control group (low afterglow technology) and the solution of the present invention at different head movement angular velocities (degrees / second) is compared through a curve graph. The dotted line in the figure represents the system power consumption of the control group, and the solid line represents the system power consumption of the solution of the present invention. It can be seen that at the same angular velocity, the system power consumption of the solution of the present invention is significantly lower than that of the control group.

[0043] like Figure 3As shown in the figure, this figure describes an optical system control method for reducing VR motion blur based on motion and visual sensors (such as IMU and eye tracking cameras) worn on the user's head. The P1 module performs motion perception and judgment, processes IMU data and determines the core state; the angular velocity data is written into the D1 historical data queue for reading by the P4 comfort adjustment module. The P4 module analyzes the discomfort risk based on the motion history data and outputs a dark corner rendering instruction; the light signal response waveform is captured by the eye tracking camera and written into the P3 closed-loop self-calibration module. The P3 module measures and compensates for the light valve response delay online, which reads the D2 The compensation parameter library is written into the compensation time quantity to the P2 light valve control module. The P2 module generates and adjusts the switching instructions of the light valve. When the state is determined to switch from static micro-motion to dynamic operation, the P5 smooth transition control module is triggered. This module determines the transition duration according to the sound field environment, obtains the audio characteristics from the ambient sound field through the audio stream collected by the microphone, and reads the influence coefficient k from the D3 sound field mapping relationship table to determine the transition duration. The transition duration controls the P2 light valve control module to adjust the light valve opening time. The light valve control instructions of the P2 module ultimately act on the optical system (liquid crystal light valve and Pancake lens group).

[0044] Example 4: To address changes in the response characteristics of the liquid crystal light valve due to operating conditions or aging, the system integrates a closed-loop self-calibration procedure. This procedure is triggered at a non-visual perception time and sends a square wave drive signal with a certain frequency and duty cycle to the liquid crystal light valve. At the same time, it instructs the eye tracking camera to switch to a raw data mode to linearly record changes in light flux. The procedure analyzes the collected light signal response waveform to determine the minimum light flux in its stable state. With the highest luminous flux , and calculate the opening response delay accordingly Delayed response to shutdown ,in is defined as the luminous flux from Rise to The time required, is defined as the luminous flux from Down to The time required; eventually, the system generates a compensation time , whose value is given by the formula The compensation time is calculated and, in the subsequent dynamic operation state, the timing of issuing the pulse operation instruction is advanced accordingly, so that the physical switching action of the light valve is accurately aligned with the refresh period of the display frame.

[0045] In order to cope with the visual discomfort that may be caused by excessive disorder in the user's head movement pattern, the system also includes a comfort adjustment step based on the analysis of historical movement data; this step establishes a historical data queue for storing the angular velocity data collected for a preset time period of 2 seconds. This queue is a first-in-first-out buffer with a fixed length; the system periodically calculates the information entropy of the data sequence in this queue to quantify the degree of movement disorder. The calculation process is: divide the angular velocity values ​​in the queue into Preset discrete intervals, statistics fall in each interval The proportion of samples within , and then according to the formula Calculating information entropy ;like If the value exceeds a preset comfort index threshold, the system will render a dark corner with a gradient boundary in the peripheral area of ​​the display screen. The range and opacity of the dark corner are The value exceeds the threshold value. When the value drops below this threshold, vignetting is removed to restore the full effective field of view. Through the aforementioned self-calibration and comfort adjustment steps, the system not only suppresses motion blur in its initial state, but also maintains its performance stability and user visual comfort under different working conditions and long-term use through closed-loop adaptive control.

[0046] In the comfort adjustment step, the generation of the two parameters, vignetting range and opacity, follows a quadratic function procedure driven by super-threshold information entropy. Specifically, the procedure first determines a saturation entropy increment based on user feedback in a dedicated calibration scenario. , which represents the entropy value that exceeds the threshold when the user reports significant discomfort. Then, the program will calculate the super-threshold information entropy in real time. Normalize it and get a dimensionless exercise intensity factor Finally, based on this factor, the maximum vignetting range of the system is preset , for example, set it to 25% of the field of view height and the maximum opacity For example, if it is set to 0.8, the specific parameters of the dark corners that should be rendered in the current frame are calculated. The function relationship is: dark corner range ; Vignette Opacity .

[0047] Example 5: In order to establish a quantitative relationship between the sound field environment and the duration of the visual mode transition, the relevant parameters in this technical solution are determined by a set of offline calibration procedures; the procedure establishes a standardized audio sample library containing a variety of typical sound field environment recordings, and calculates the two sound field characteristic parameters of the spectrum center and zero crossing rate for each audio sample in the library. According to a preset weighting function, the function linearly combines the normalized spectrum center and zero crossing rate with a weight of 6:4, thereby combining these two characteristic parameters into a single sound field instability quantification value At the same time, human factors engineering experts specify an ideal transition time for each type of sound field environment. , and using the specified Value, audio sample calculated value and a fixed base transition duration , through the formula Inversely solve the influence coefficient The value of each audio sample The corresponding The values ​​are stored together in the mapping table in the device.

[0048] In the actual operation of the device, when the judgment result switches from the static micro-motion state to the dynamic operation state, the system calls the microphone to collect the ambient audio stream and calculates the real-time Value, and refer to the aforementioned mapping relationship table based on this value to determine the influence coefficient , and then calculate the transition duration of the switch During this transition period, the opening time of the liquid crystal light valve is linearly shortened from the full-frame time to the target opening time of the pulse operation; when the judgment result switches back from the dynamic operation state to the static micro-motion state, the system adopts a fixed and shorter transition period, during which the opening time of the liquid crystal light valve is linearly restored from the target opening time of the pulse operation to the full-frame time. This two-way transition mechanism transforms the sensory abruptness caused by the change of visual mode into a smooth and natural process.

[0049] In the visual state smooth transition step, it is used to calculate the transition duration Basic transition time and influence coefficient These two key parameters are determined through regression analysis results of a standardized user experience research procedure; the procedure is based on the quantitative value of the sound field instability for each type of sound field environment in the standardized audio sample library. Representation, presenting a statistically significant group of subjects, for example, a sample size N ≥ 30, with multiple discrete durations For example, the visual mode switching is performed from 0.1 seconds to 2.5 seconds with a step length of 0.1 seconds, and the subjects are asked to rate the naturalness of each switching process on a seven-point Likert scale. Subsequently, the procedure will select the duration with the highest average score for each type of sound field environment as its objective optimal transition duration. , thus obtaining a set of data point pairs Finally, by performing the least squares linear regression analysis on this set of data points, the fitting line is obtained. The intercept is , the slope is And solidify these two parameters in the device's mapping relationship table D3.

[0050] Example 6: In this embodiment, after the virtual reality device is activated for the first time or a firmware update is performed, the system executes a set of standardized pre-calibration and verification procedures to establish a baseline for key control parameters and configure a fault-tolerant mechanism; the procedure guides the user into a dedicated calibration scene, which contains a visual target moving along a preset trajectory. When the target moves at a reference angular velocity, the system drives the liquid crystal light valve at multiple different pulse operation on-times and records the user's binary selection feedback on clarity and brightness. Based on the feedback data, the system determines an on-time that strikes a balance between clarity and brightness perception, and sets it as the target on-time for pulse operation in subsequent dynamic operation states.

[0051] In the subsequent stages of this calibration scenario, the system presents a series of visual contents with different degrees of motion disorder, whose motion history data corresponds to a set of pre-calculated information entropy values ​​covering a range from low to high. Value; the system collects active feedback from users to determine the information entropy that causes visual discomfort The critical point of the value is determined, and the critical point is set as the comfort index threshold of the user; this procedure provides an objective and personalized setting basis for the intensity of dynamic blur suppression and the triggering conditions of comfort adjustment; the pre-procedure also includes self-test and fault-tolerant strategy configuration for key sensors; the system checks the working status of the inertial measurement unit and the microphone at startup. If the signal interruption of the inertial measurement unit is detected or the data quality is lower than a preset signal-to-noise ratio threshold, the control system locks the liquid crystal light valve in a fully open transparent state, so that the device maintains operation in a static micro-motion display mode; if the microphone signal is detected to be interrupted, the system will use a fixed basic transition time when executing the visual state smooth transition step. , without enabling dynamic adjustment based on sound field characteristic parameters; by executing this pre-procedure, the device establishes a reliable parameter baseline for subsequent adaptive control and pre-configures the fault-tolerant strategy of key sensors, thereby improving the safety of the entire optical system control method in practical applications.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. An optical system control method for reducing VR motion blur, characterized in that: The method comprises the following steps: Step a, instructing the display panel in the virtual reality device to operate in a continuous lighting mode; Step b: continuously acquiring angular velocity data representing the user's head movement from an inertial measurement unit of the virtual reality device; Step c, based on an angular velocity threshold, determining the acquired angular velocity data as corresponding to a stationary micro-motion state or a dynamic operation state; In step d, based on the determination result of step c, a liquid crystal light valve is asynchronously controlled, which is independent of the display panel and located in its optical path. If the determination result is a stationary micro-motion state, the liquid crystal light valve is controlled to maintain a fully open, transparent state during a frame display period of the display panel. If the determination result is a dynamic operation state, the liquid crystal light valve is controlled to perform a pulse operation of opening and closing once during each frame display period of the display panel. The method further includes a self-calibration step for compensating for a response delay of the liquid crystal light valve, the step comprising: sending a square wave drive signal having a predetermined frequency and duty cycle to the liquid crystal light valve at a non-visually perceptible timing; utilizing an eye-tracking camera within a virtual reality device to capture a light signal response waveform passing through the liquid crystal light valve; calculating a physical response delay of the liquid crystal light valve by comparing the square wave drive signal with the light signal response waveform; generating a compensation time quantity, and adjusting the timing of issuing open and close instructions in a pulse operation based on the compensation time quantity; When the result of the determination in step c switches from the static micro-motion state to the dynamic running state, a visual state smooth transition step is executed, which includes: calling the microphone of the virtual reality device to collect the audio stream of the current environment; calculating the sound field characteristic parameters of the spectrum center and zero crossing rate based on the audio stream; determining a transition duration based on the sound field characteristic parameters. , the calculation of transition duration follows the following relationship: ,in, The transition duration of this switch; It is a fixed basic transition duration; is an influence coefficient; is a quantitative value of the sound field instability calculated based on the sound field characteristic parameters; within the transition period, the opening time of the liquid crystal light valve is linearly shortened from the full frame time to the target opening time of the pulse-pure operation.

2. The optical system control method for reducing VR motion blur according to claim 1, characterized in that: In pulse operation, the duration of the opening of the liquid crystal light valve is less than a quarter of the frame display period; after the opening duration ends, the liquid crystal light valve switches to a closed, opaque state for the remaining time of the frame display period.

3. The optical system control method for reducing VR motion blur according to claim 1, characterized in that: It also includes a comfort adjustment step based on motion disorder, which includes: establishing a historical data queue for storing angular velocity data in a past time period; calculating the information entropy of the data sequence in the historical data queue as an indicator for quantifying the motion disorder; if the information entropy exceeds a comfort index threshold, rendering a dark corner with a gradient boundary in the peripheral area of ​​the display screen, and the range and opacity of the dark corner increase according to the value of the information entropy exceeding the comfort index threshold.

4. The optical system control method for reducing VR motion blur according to claim 3, characterized in that: When the information entropy falls below the comfort index threshold, dark corners with gradient boundaries are removed.

5. The optical system control method for reducing VR motion blur according to claim 2, characterized in that: The non-visual perception timing refers to the period when the eye tracking camera detects the user's complete blink process or the black screen period when the virtual reality system switches scenes.

6. The optical system control method for reducing VR motion blur according to claim 1, characterized in that: The optical system adopts a Pancake optical solution, and the liquid crystal light valve is arranged between the display panel and the lens group of the Pancake optical solution.

7. The optical system control method for reducing VR motion blur according to claim 1, characterized in that: The angular velocity threshold is set to a value in the range of 3 degrees / second to 10 degrees / second.

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