Laser Projection DLP Timing to Reduce Micro-Mirror Fatigue
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laser projection technologies face challenges in efficiently managing the mechanical fatigue of digital micro-mirrors due to prolonged use, which affects the operational reliability and service life of the DMD, particularly when displaying static or highly duplicated images.
Innovation Solution
Implementing a rotation switching period during the output of blue beams, where the laser source is turned off, and the micro-mirrors in the DMD are flipped between ON and OFF states to alleviate mechanical stress, combined with a power system architecture that controls the laser source and optical engine operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the laser source continuously outputs blue beams and micro-mirrors continuously operate, then projection display continuity is maintained, but mechanical fatigue of micro-mirrors increases
Solution Approach 1:
The patent implements periodic action by introducing a rotation switching period during blue beam output where the laser source is turned off and micro-mirrors are flipped between ON and OFF states. This periodic interruption allows micro-mirrors to rest and perform rotation switching, reducing cumulative mechanical fatigue while maintaining overall projection display functionality through resumption of normal operation in subsequent periods
2Reliability
If micro-mirrors are flipped repeatedly during operation, then mechanical stress is alleviated, but projection display quality may be affected
Solution Approach 1:
The patent applies preliminary action by performing the rotation switching of micro-mirrors during the blue beam output period when the laser source is turned off. This timing ensures that the micro-mirrors complete their rotation switching and return to their proper positions before the laser source is turned on again, thereby maintaining projection display quality while still achieving the benefit of reduced mechanical stress through repeated flipping
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces mechanical fatigue of the micro-mirrors, enhances the operational reliability of the DMD, and extends its service life by allowing micro-mirrors to rest and flip repeatedly, thus maintaining the projection display quality.
Implementation Method 1
The digital micro-mirror device includes a plurality of micro-mirrors, and the plurality of micro-mirrors are configured to flip at different angles due to control of a first drive signal obtained from conversion of an image display signal, so that the illumination beams provided by the laser source are modulated into projection beams
Data Source
AI summary
A laser projection apparatus and a laser projection display method are provided. The laser projection apparatus includes a laser source, an optical engine, a projection lens, and a power system architecture. The power system architecture includes a digital light processing (DLP) control processing portion. The DLP control processing portion is configured to: output a first enable signal and a first luminance adjustment signal to a laser driver circuit and a first drive signal to a digital micro-mirror device, in the first period; output a second enable signal and a second luminance adjustment signal to the laser driver circuit and a second drive signal to the digital micro-mirror device, in the second period. The laser driver circuit is configured to: drive a laser array to emit a primary color beam in the first period, and drive the laser array to be turned off in the second period.