Vertical Scanner Control for Scanning Image Display Synchronization
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Solution Overview
Problem
Scanning-type image display devices face challenges in synchronizing horizontal and vertical scanning due to manufacturing errors and environmental changes, leading to image distortion and undisplayable frames, especially when the resonance frequency of scanners deviates from the refresh rate or is affected by temperature and illumination.
Innovation Solution
A scanning-type image display device with a vertical scanner control section that puts the vertical scanner on standby after horizontal scanning completes and restarts it in synchronization with the horizontal scanning start signal of the next frame, ensuring reliable synchronization of horizontal and vertical scanning, even with discrepancies in scan line numbers and fluctuating scanning frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the resonance frequency of the scanner is adjusted to match the refresh rate, then scanning synchronization is improved, but manufacturing precision becomes difficult to achieve due to temperature and illumination changes
Solution Approach 1:
The patent implements a feedback mechanism where the actual scanning frequency is detected and compared with the target frequency, and the driving frequency is adjusted based on the detected frequency to maintain synchronization. This closed-loop control compensates for frequency drift caused by temperature and illumination changes without requiring precise manufacturing.
Solution Approach 2:
The patent changes the operating parameters dynamically by adjusting the driving frequency of the scanner based on detected frequency deviations. This allows the system to adapt to environmental changes and maintain synchronization despite manufacturing tolerances.
2Measurement precision
If the scanning frequency is increased to achieve higher resolution, then image quality is improved, but synchronization stability deteriorates due to frequency drift
Solution Approach 1:
The feedback mechanism continuously monitors the actual scanning frequency and adjusts the driving frequency to maintain the correct relationship between horizontal and vertical scanning, even at high frequencies. This ensures synchronization stability while enabling high-resolution display.
3Manufacturing precision
If the resonance point of the mirror is precisely adjusted during manufacturing, then scanning accuracy is improved, but the system becomes sensitive to temperature and illumination changes
Solution Approach 1:
The patent transitions from a static resonance point adjustment to a dynamic frequency adjustment system. The driving frequency is continuously adapted based on environmental conditions and actual scanning performance, making the system robust to manufacturing variations and environmental changes.
Solution Approach 2:
The feedback mechanism detects frequency drift caused by environmental changes and compensates by adjusting the driving frequency, allowing the system to maintain accuracy without being overly sensitive to manufacturing precision or environmental variations.
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 solution ensures favorable display quality with no image distortion and prevents undisplayable frames by synchronizing horizontal and vertical scanning, effectively addressing manufacturing errors and environmental changes.
Implementation Method 1
drives a mirror supported by a torsion spring or the like with electrostatic force or the like
Implementation Method 2
scan light by causing the mirror to travel in a reciprocating motion via the interaction of the electrostatic force and the restoring force of the spring
Implementation Method 3
drives a mirror supported by a torsion spring or the like with electrostatic force or the like
Implementation Method 4
restarts the vertical scanning by the vertical scanner in synchronization with an input timing of the horizontal scanning start signal
Data Source
AI summary
A scanning-type image display device includes: a light source section; a horizontal scanner; a vertical scanner, and a vertical scanner control section in such manner that, when a discrepancy occurs between a target scan line number and a scannable line number, and when a difference obtained by subtracting of the target scan line number from the scannable line number is a positive value, the vertical scanner control section controls the vertical scanner so as to put vertical scanning on standby within a time range from a point of time at which horizontal scanning is completed in a first frame to a point of time at which a horizontal scanning start signal corresponding to a vertical synchronizing signal of the video signal in a second frame is input, and restarts the vertical scanning in synchronization with an input timing of the horizontal scanning start signal.