| Near-eye displays can be divided into virtual reality(VR)and augmented reality(AR)systems.With the continuous improvement of performance,more and more applications have been made in recent years.But delay is still a key technical issue for near-eye display.The main reasons for the delay are:1.The sensor cannot respond in real time;2.The image signal processing and transmission takes time.Moreover,the performance of the products on the market varies,with delays ranging from 19ms to 30ms.In order to standardize the product market,scientifically and accurately test and evaluate its performance,establish relevant standards,and provide efficient and reliable detection methods for product production,this paper designs and produces a new type of near-eye display delay detection device.For the currently widely used delay detection scheme for near-eye display-using a professional fast camera to shoot the display frame by frame,there are large space occupation,high construction cost,complex data processing algorithm,high operation threshold,and large power consumption Problem,this paper presents a method for real-time scanning,continuous detection,calibration time,and calculation time in the STM32 microcontroller using photodiode detection light intensity data.A method with low cost,fast detection speed,and high time accuracy,high signal-to-noise ratio,high magnification,simple data processing algorithm and other advantages in one near-eye display delay detection device.The results of the device are proved by experiments as follows:1.Before the detection device performs physical detection,first run it on a calibration system,and analyze the obtained waveform diagram to know the self-response delay of the PIN photodiode used is 37μs;the average value of the rise time of the front detection device is 0.785ms,the average value of the fall time is 0.434ms,and the measurement accuracy of system is l μs.2.The signal-to-noise ratio of the output signal of the pre-photoelectric detection amplifier circuit module is 48dB;3.The signal-to-noise ratio of the output signal processed by the noise signal removal module is 71dB;4.The amplification factor of the effective output signal is 61.5dB;5.Through multiple detection and analysis of the data waveform of the device,it can be seen that the average value of the rising time of the overall detection device is 0.856ms and the average value of the falling time is 0.725ms.In the waveform diagram,the delay of the VR device is 24.486ms.The average value of the delay of the VR device processed in the single-chip microcomputer is 26.509ms.The measurement error rate is 8.262%.According to the test results,the design of the new near-eye display delay detection device designed and researched meets the technical indicators of this article and the measured time has the characteristics of high precision and high accuracy.The modular design can also be used when writing programs.Multi-functional testing is performed for different requirements,and the overall device can achieve excellent human-computer interaction. |
