Projection Device Internal Signal Generation for Gridline Adjustment
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Solution Overview
Problem
Existing projection devices cannot produce image adjustment gridlines without an input signal source, limiting their functionality and user flexibility.
Innovation Solution
A projection device with a signal input unit, image signal generating unit, image adjustment unit, control unit, and projection unit, where the control unit detects the absence of an external signal and generates an image signal to serve as a signal source, allowing the image adjustment unit to produce gridlines for image adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image adjustment function uses a warping chip that requires an external signal source, then the image adjustment can be performed with proper signal synchronization, but the adjustment function becomes unavailable when no external signal source exists
Solution Approach 1:
The patent introduces an intermediary component (signal source generation module) that creates a virtual signal source when external signals are unavailable. This intermediary enables the warping chip to function by providing the necessary clock and synchronization signals internally, thus resolving the contradiction between maintaining adjustment function reliability and reducing signal source dependency.
Solution Approach 2:
The system implements self-service by enabling the projection device to generate its own signal source through the image signal generating unit when external signals are absent. This allows the device to serve itself with the necessary synchronization signals, making the image adjustment function available without external signal dependency.
2Measurement precision
If the warping chip waits for external signal source availability, then signal synchronization is ensured, but adjustment operations are delayed or prevented
Solution Approach 1:
The system dynamically switches between external signal source mode and internal signal source generation mode based on availability. When external signals are present, the system uses them for synchronization; when absent, it automatically transitions to generating internal signals, maintaining both synchronization accuracy and operational flexibility throughout the transition.
Solution Approach 2:
The patent changes the signal source parameter from exclusively external to a conditional state where the system can switch between external and internal generation. This parameter change enables the system to maintain synchronization accuracy by adapting the signal source configuration based on environmental conditions, thereby preserving ease of operation.
Data Source
AI summary
A projection device having a signal input unit, an image signal generating unit, an image adjustment unit, a control unit and a projection unit is provided. The signal input unit receives an external signal. The image signal generating unit generates an image signal. The image adjustment unit generates image adjustment gridlines according to the signal source. The control unit detects the signal input unit, and when the signal input unit does not receive the external signal, the control unit controls the image signal generating unit to generate the image signal to serve as the signal source. The projection unit projects the signal source and the image adjustment gridlines onto a projection plane. The projection device and the method for generating adjustment gridlines of the invention are still capable of generating the image adjustment gridlines in case that an input signal source does not exist.