Projector intelligent focusing design method based on ultrasonic ranging

Abstract

The invention discloses a projector intelligent focusing design method based on ultrasonic ranging. A DMD (Digital Micromirror Device) ray machine is internally provided with an MCU control chip, an ultrasonic ranging module and a focusing motor; one end of the focusing motor is connected with a focusing rod; through detecting a projection distance, the ultrasonic ranging module calculates and obtains the number of steps to be rotated by the focusing motor; and through controlling the motor driving chip, the MCU control chip enables the motor to drive the focusing rod on the DMD ray machine to rotate, and thus, focusing on the DMD ray machine can be completed. According to the projector intelligent focusing design method based on ultrasonic ranging, the cost needed for ultrasonic ranging is low, the system can avoid error operation caused due to vibration or object occlusion during the ranging process through a de-interference technology, the system adjusts the step size to be rotated by motor control through detecting the environment temperature in the case of work, a ray machine apparent focus problem caused by thermal expansion and contraction can be avoided, and the projection picture of the ray machine is kept distinct.

Description

technical field [0001] The invention discloses an intelligent focusing design method for a projector based on ultrasonic ranging, which can be adjusted according to temperature and calibrated on different hardware platforms. Background technique [0002] DLP is the abbreviation of "Digital Light Procession", which is digital light processing, which means that this technology must first process the image signal digitally, and then project the light. It is based on the digital micromirror component developed by TI (Texas Instruments) - DMD (Digital Micromirror Device) to complete the technology of visual digital information display. To be more specific, DLP projection technology uses a digital micromirror wafer (DMD) as the main key processing element to realize digital optical processing. [0003] At present, the existing DLP optomechanics all need to perform focusing processing according to different distances, so a focusing rod is reserved near the optomechanical lens; th...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that micro-projectors have frequent focusing times and manual mechanical focusing is inconvenient, the present invention provides a design method for realizing intelligent focusing of projectors based on ultrasonic ranging, which uses ultrasonic ranging modules and MCU control chips , The motor control circuit forms the focusing system, which can make the micro projector intelligently focus, and the calibration of different platforms only needs to be adjusted through infrared remote control

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