Projection Light Source Module Shunt Circuit Redundancy
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Solution Overview
Problem
Laser diode strings used in projection apparatuses have inconsistent service lives, leading to malfunction and disruption of light beam production, affecting projection quality.
Innovation Solution
A light source module with a shunt module and control circuit that provides shunt paths to redirect current to functioning light-emitting elements, ensuring continuous illumination even if some elements malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If laser diode string is used as light source, then service life and power saving are improved, but projection quality deteriorates when laser diode malfunctions
Solution Approach 1:
The light-emitting element string is divided into multiple portions (first, second, third light-emitting portions) with different numbers of light-emitting elements. Each portion can be independently controlled through shunt circuits, allowing the system to segment the light source into functional units that can operate independently when others fail.
Solution Approach 2:
The patent changes the parameter of light-emitting element configuration by having different numbers of elements in different portions (first, second, third portions have different quantities). This parameter variation ensures that when some elements fail, the remaining portions can still provide sufficient illumination, maintaining projection quality while extending effective service life.
2Illumination intensity
If light-emitting elements are connected in series, then brightness is improved, but reliability deteriorates when one element malfunctions
Solution Approach 1:
The series-connected light-emitting elements are segmented into multiple portions, with shunt circuits provided for each portion. When elements in one portion fail, the shunt circuit bypasses that portion, allowing current to continue flowing through other portions, thus maintaining continuous operation while preserving overall brightness.
Solution Approach 2:
Shunt circuits act as intermediary components that provide alternative current paths. When light-emitting elements malfunction, the shunt circuits mediate by redirecting current around the failed elements, ensuring continuous operation without completely disrupting the lighting function.
3Reliability
If shunt circuits are added to light source module, then reliability is improved, but device complexity increases
Solution Approach 1:
The shunt module is segmented into multiple shunt circuits corresponding to different light-emitting portions. Each shunt circuit is relatively simple in structure, but collectively they provide comprehensive redundancy. This segmented approach distributes the complexity across multiple simple units rather than requiring one complex protection circuit.
Solution Approach 2:
The patent optimizes the parameters of the shunt circuits by configuring them with different resistance values or connection points based on the specific requirements of each light-emitting portion. This parameter optimization ensures that the shunt circuits provide effective redundancy while minimizing their impact on overall system complexity and power consumption.
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
This solution maintains projection quality and optical performance by ensuring the light-emitting element string can still provide a light beam despite malfunctioning elements, effectively extending the service life and brightness of the light source module.
Implementation Method 1
The shunt module includes a first shunt circuit, a second shunt circuit, and a third shunt circuit. The first shunt circuit is connected in parallel with the first light-emitting portion to form a pair of first connection nodes on the light-emitting element string, and is adapted to provide a first shunt path.
Data Source
AI summary
A projection apparatus and a light source module are provided. The light source module includes a light-emitting element string, a shunt module, and a control circuit. A first shunt circuit, a second shunt circuit, and a third shunt circuit of the shunt module are coupled to the light-emitting element string, and are adapted to provide a first shunt path, a second shunt path or a third shunt path, such that the light-emitting element string is still maintained to normally work when a light-emitting element/light-emitting elements is/are malfunctioned.