Laser Projector Scanner Curved Screen Focus and Touch Noise
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Solution Overview
Problem
Conventional projection devices face challenges in projecting sharp, clean images on curved screens and achieving effective touch recognition, as they often result in out-of-focus images due to screen position and noise interference from infrared lights.
Innovation Solution
A laser projector that utilizes a scanner with a light synthesis system, infrared light emitting device, and a detector to project images and recognize touch inputs simultaneously, using circularly polarized infrared light to enhance reflectivity and reduce noise, allowing for clear image projection on curved surfaces and improved touch recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional projector uses a light source and projection lens to display images on a screen, then an image can be projected, but the image becomes out of focus when the screen is curved or at different positions
Solution Approach 1:
The patent replaces the conventional projection lens system with a scanner-based optical system. Instead of using a fixed focal length lens that requires precise positioning, the invention uses a scanner to dynamically control the projection of laser beams pixel by pixel onto the screen. This mechanical-to-optical substitution eliminates the focus-quality limitation imposed by fixed optical paths, enabling clear images on curved or variably positioned screens.
2Adaptability or versatility
If a projector wants to add touch recognition capability, then interactive functionality is improved, but the device size and complexity increase
Solution Approach 1:
The patent integrates touch recognition functionality into the existing projection system by utilizing the scanner and optical path for dual purposes. The same optical system that projects images also detects touch interactions through infrared reflection analysis. This multi-functional integration allows the projector to perform both image display and touch sensing without adding separate dedicated touch detection hardware, thereby minimizing the increase in device complexity.
Solution Approach 2:
The invention merges the projection function and touch detection function into a unified system. The scanner serves both to project image pixels and to sense touch positions by detecting reflected infrared light. By combining these functions in a single integrated architecture rather than separate systems, the patent achieves touch recognition capability while controlling the overall device complexity.
3Measurement precision
If a detector detects all infrared lights, then detection coverage is improved, but noise interference increases and touch recognition accuracy decreases
Solution Approach 1:
The patent applies local quality filtering by analyzing the spatial distribution and temporal characteristics of detected infrared signals. Instead of uniformly detecting all infrared lights, the system selectively identifies and processes signals that match the characteristics of touch-induced reflections. The detector focuses on specific spatial regions and temporal patterns associated with touch events, while filtering out background infrared noise from other sources.
Solution Approach 2:
The system uses feedback mechanisms to distinguish touch signals from noise. By continuously monitoring the infrared detection patterns and comparing them against expected touch signal characteristics, the system can identify and reject noise signals. The feedback loop allows real-time adjustment of detection parameters to maintain high touch recognition accuracy even in the presence of varying infrared background conditions.
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 enables the projection of clear images on curved screens while enhancing touch recognition rates by filtering out noise infrared lights and using a small-sized scanner for efficient image and touch input detection.
Implementation Method 1
a scanner configured to project the light to the entire area of the screen, moving in zigzag
Implementation Method 2
an infrared light emitting device configured to emit an infrared light to the screen
Implementation Method 3
a detector configured to detect a position of the reflected light
Implementation Method 4
a light synthesis system configured to synthesize colored light based on image information including color information for each pixel
Data Source
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AI summary
There are disclosed a laser projector configured to project an image to a back side of a screen and to detect a touch input, comprising a light source configured to irradiate at least one of red, green and blue lights, an infrared light emitting device configured to emit an infrared light to the screen, a light synthesis system configured to synthesize image information comprising color information for each pixel with the light irradiated from the light source so as to emit the synthesized light, a scanner configured to project the synthesized light toward the screen for each pixel, a detector configured to detect an infrared light reflected by an object approaching the screen, and a controller configured to control operations of the light source, the infrared light emitting device and the scanner and to recognize touch input based on the information detected by the detector, such that the laser projector that may perform the projection of the image to the screen and the touch recognition simultaneously may be provided, only to be small-sized.