Projection Device With Shared Laser Drive for Color-Sequential Emission
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Solution Overview
Problem
Existing projection devices using multiple driving circuits for laser light sources face issues of increased complexity, cost, and electromagnetic interference due to frequent transistor switching, leading to reliability concerns.
Innovation Solution
A simplified projection device design using a single control circuit, one driving circuit, and one switching circuit to manage multiple laser light sources, ensuring sequential light emission to avoid color mixing and reduce electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple driving circuits are used for each laser light source, then each light source can be independently controlled, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple driving circuits into a single shared driving circuit that sequentially drives multiple laser light sources. The control circuit manages the switching between different light sources, allowing one driving circuit to perform the function of multiple circuits, thereby reducing overall device complexity while maintaining independent control capability.
Solution Approach 2:
The single driving circuit is designed to be universal, capable of driving different types of laser light sources (red, green, blue lasers) through sequential activation. This multi-functional approach allows one circuit to replace multiple specialized circuits, reducing complexity while preserving control flexibility.
2Ease of operation
If transistors are frequently switched to control light sources, then light emission control is achieved, but electromagnetic interference increases and reliability decreases
Solution Approach 1:
The patent implements periodic action by sequentially activating different laser light sources in a controlled time sequence rather than continuous operation. The control circuit manages the timing and duration of each light source's activation, reducing the frequency and intensity of transistor switching events, thereby minimizing electromagnetic interference and improving system reliability.
3Manufacturing precision
If multiple driving circuits are used, then precise current control for each light source is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple current control functions into a single driving circuit with centralized current regulation. The control circuit manages the current distribution to different laser light sources sequentially, eliminating the need for multiple independent current control circuits. This reduces component count and manufacturing cost while maintaining precise current control through centralized management.
Data Source
AI summary
A projection device, including: a plurality of light sources having different colors; a first driving circuit configured to supply a first current to the light sources based on a first enable signal and at least one first driving signal; at least one switching circuit configured to turn on or turn off the first current supplied to the light sources based on at least one first switching signal; and a control circuit configured to supply the first enable signal and the at least one first driving signal and supply the at least one first switching signal based on light emission information of the light sources, to enable the light sources to emit light in different light-emitting periods respectively according to the light emission information, wherein the light emission information comprises a light-emitting timing sequence, a light-emitting duration and a rated current.