Laser Scanner Alignment via Piezoelectric Feedback
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Solution Overview
Problem
Image display devices in laser scan systems face misalignment issues due to variations in the reciprocating operation of optical scanners, particularly caused by temperature changes, which require significant computing power to correct and result in distortions in the displayed image.
Innovation Solution
The implementation of a control method that uses a Field Programmable Gate Array (FPGA) and microcomputer to generate drive signals for optical scanners, incorporating a drawing position control unit that adjusts the scanning position based on detection signals from piezoelectric films, ensuring alignment by correcting the counting start position based on differences between detected operation ranges and reference values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If trigonometric functions are used to compensate for scanning mirror speed variations, then image alignment is improved, but computational power requirements increase significantly
Solution Approach 1:
The patent replaces complex trigonometric calculations with simple lookup tables that store pre-calculated correction values. This approach uses minimal computational resources while achieving the same image alignment correction, effectively substituting expensive real-time computation with inexpensive pre-computed data
Solution Approach 2:
The correction values are calculated in advance and stored in lookup tables before the actual scanning operation. This preliminary computation eliminates the need for complex real-time calculations during scanning, reducing computational power requirements while maintaining alignment accuracy
2Stability of the object's composition
If feedback control is performed to maintain constant scanning frequency, then scanning stability is improved, but misalignment occurs due to temperature-induced operation variations
Solution Approach 1:
The patent uses feedback from detection piezoelectric films to monitor the actual scanning operation and dynamically adjusts the drawing position based on detected variations. This feedback mechanism compensates for temperature-induced operation changes while maintaining overall scanning stability
Solution Approach 2:
The patent changes the control parameter from fixed scanning frequency maintenance to dynamic drawing position adjustment. By monitoring actual scanner operation and adjusting drawing positions in real-time, the system adapts to temperature variations without requiring constant frequency stabilization
3Device complexity
If simple feedback control is used to adjust start timing of drive signals, then system complexity is reduced, but misalignment in each scanning line persists due to operation variations
Solution Approach 1:
The patent incorporates feedback from detection piezoelectric films that monitor the actual scanning operation. This feedback enables dynamic adjustment of drawing positions for each scanning line, correcting misalignment caused by operation variations while keeping the overall system relatively simple
Solution Approach 2:
The patent transitions from static start timing adjustment to dynamic drawing position adjustment based on real-time detection of scanning operation variations. This dynamic approach adapts to each scanning line's actual performance, maintaining alignment without requiring complex predictive models
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 effectively prevents misalignment in each scanning line, reducing computational requirements and maintaining image alignment despite variations in scanner operation, thereby ensuring a stable and accurate image display.
Implementation Method 1
an operation of an optical scanner provided with a piezoelectric film is detected by the piezoelectric film
Data Source
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AI summary
An image display device (100) includes: an RGB laser diode (200) configured to output laser light; a horizontal scanner (220) configured to reflect the laser light and perform a reciprocating operation in a horizontal direction; a scanning detection unit (202) configured to detect a forward or reverse operation range and a reciprocating operation range in each line in the horizontal direction; a drawing position control unit (116) configured to determine an image display position in each line based on a difference between the detected operation ranges and a reference value; and a laser driver (140) configured to drive the RGB laser diode (200) based on image data at a timing corresponding to the determined image display position.