Spliced Invisible Light Screen for Projection Uniformity
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Solution Overview
Problem
Conventional invisible light screens in interactive projection systems suffer from insufficient uniformity, leading to incorrect touch signals due to variable distances from the projection plane and inability to uniformly cover the projection area, resulting in excessive darkness.
Innovation Solution
A light screen generating device with a movable carrier module, a first light-emitting module forming a spliced invisible light screen, and a second light-emitting module generating a visible light screen parallel to the invisible light screen, which synchronously adjusts to ensure uniform coverage and flatness of the projection area, using an adjusting mechanism and wireless signal control for lens synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single light-emitting structure is used to generate an invisible light screen, then the device structure is simple, but the light emission uniformity across the projection area is insufficient
Solution Approach 1:
The patent divides the light-emitting structure into multiple first light-emitting structures (first, second, third, and fourth light-emitting structures) that each generate a portion of the invisible light screen. These segmented light-emitting structures work together to achieve uniform light emission across the entire projection area, resolving the contradiction between simplicity and uniformity.
Solution Approach 2:
The patent combines multiple invisible light screens generated by separate light-emitting structures to form a complete invisible light screen that uniformly covers the projection area. This merging approach maintains the simplicity of individual structures while achieving the uniformity of a comprehensive light screen.
2Ease of operation
If the light screen is positioned far from the projection plane, then touching objects can easily interact with the projection plane, but incorrect touching locations are detected
Solution Approach 1:
The patent adjusts the position of the invisible light screen to an optimal distance from the projection plane using an adjusting mechanism. This parameter optimization ensures that the light screen is neither too far (causing detection errors) nor too close (causing light blocking), thereby resolving the contradiction between ease of operation and detection accuracy.
3Measurement precision
If the light screen is positioned close to the projection plane, then accurate touch detection is improved, but reflected light beams are blocked by touching objects
Solution Approach 1:
The adjusting mechanism optimizes the distance between the invisible light screen and the projection plane, finding the optimal position that prevents light beam blocking while maintaining detection accuracy. This resolves the contradiction between accurate touch detection and ease of touching operation.
4Adaptability or versatility
If the invisible light screen alone is used to cover the projection area, then the interaction function is achieved, but the flatness of the projection area cannot be determined
Solution Approach 1:
The patent combines the invisible light screen (for interaction detection) with a visible light screen (for flatness determination). The visible light screen overlaps with the invisible light screen and enables the system to determine projection area flatness, while the invisible light screen maintains the touch interaction function. This merging resolves the contradiction between interaction capability and flatness measurement.
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 enhances light uniformity and flatness of the projection area, preventing incorrect touch signals and ensuring accurate interaction by uniformly covering the projection area, while also allowing synchronized control of the projection and light-emitting modules.
Implementation Method 1
a first light-emitting module including a plurality of first light-emitting structures disposed on the movable carrier module, each first light-emitting structure generating an invisible light screen
Implementation Method 2
a second light-emitting module including a second light-emitting structure that is disposed on the movable carrier module and that generates a visible light screen parallel to and overlapping the spliced invisible light screen
Implementation Method 3
the invisible light screen be reflected by a touching object and to generate reflected light beams
Data Source
AI summary
The present disclosure provides a projection system and a light screen generating device thereof. The light screen generating device includes a movable carrier module, a first light-emitting module, and a second light-emitting module. The first light-emitting module includes a plurality of first light-emitting structures disposed on the movable carrier module. Each of the first light-emitting structures generates an invisible light screen, and the invisible light screens respectively generated by the first light-emitting structures are mated with each other to form a spliced invisible light screen for increasing light emission uniformity. The second light-emitting module includes a second light-emitting structure that is disposed on the movable carrier module and that generates a visible light screen parallel to and overlapping the spliced invisible light screen.