Scan-Type Image Display Device Rectangular Scan Area Control
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Solution Overview
Problem
Existing scan-type image display devices with two-dimensional light scanning systems require complex structures and control systems to achieve a rectangular scan area, leading to manufacturing difficulties and reduced light utilization efficiency due to the need for large-area optical components and timing control circuits.
Innovation Solution
A scan-type image display device using a first scan unit for one-dimensional laser beam scanning and a second scan unit for another direction, with a scan control unit that equalizes the scan width in both directions, eliminating the need for complex optical systems and timing control circuits, and optimizing light utilization efficiency by maintaining constant scan width across the light receiving surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a correcting optical system is provided to convert the scan area into a rectangular area, then the scan area shape is improved, but the device complexity and manufacturing difficulty increase due to the need for large-area optical components
Solution Approach 1:
The patent extracts the scan width adjustment function from a separate correcting optical system and integrates it directly into the first scanner's control mechanism. By controlling the scan width of the first scanner based on the scan position in the vertical direction, the system achieves rectangular scan area conversion without requiring additional optical components, thus reducing device complexity while maintaining the desired shape correction.
2Shape
If the turn-on timing of the light source is controlled for each line to convert the scan area, then the scan area shape is improved, but the light utilization efficiency decreases due to periods when the light source is turned off
Solution Approach 1:
The patent dynamically adjusts the scan width of the first scanner based on the vertical scan position, transitioning from a fixed scan width approach to a variable scan width control. This dynamic adjustment allows the scan area to be corrected to a rectangular shape while maintaining continuous light emission, as the scan width is adjusted rather than the light source timing being changed, thereby avoiding energy loss.
3Shape
If the turn-on timing control circuit is implemented to convert the scan area, then the scan area shape is improved, but the control circuit complexity increases
Solution Approach 1:
The patent removes the need for a separate turn-on timing control circuit by integrating the scan width adjustment function into the existing scanner control system. By controlling the scan width of the first scanner based on vertical position, the system achieves rectangular scan area conversion without requiring additional timing control hardware, thus reducing overall device complexity.
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
The solution allows for a simple structure to convert the scan area into a rectangular shape with improved light utilization efficiency by maintaining constant scan width, reducing the complexity of optical systems and control circuits, and enhancing the control over scan capabilities.
Implementation Method 1
a first scan unit which performs scan of the laser beam in the one direction by deflecting the laser beam
Implementation Method 2
a second scan unit which performs scan of the laser beam in another direction by deflecting the laser beam
Data Source
AI summary
A scan-type image display device which displays an image by scan of laser beam emitted from a light source in one direction and another direction of a light receiving surface includes: a first scan unit which performs scan of the laser beam in the one direction by deflecting the laser beam; a second scan unit which performs scan of the laser beam in the another direction by deflecting the laser beam; and a scan control unit which equalizes the scan width of the laser beam scan in the one direction by using the first scan unit performed at each position in the another direction within the light receiving surface.