Projection Apparatus Light Source Drive for 3D Heat Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In DLP projection systems, the generation of excessive heat during three-dimensional image projection due to bright synchronization pulses and liquid crystal response times leads to larger heat radiation units, compromising stable operation.
Innovation Solution
A projection apparatus with multiple light-emitting elements that control light emission states for color image formation, synchronization, and off-states to minimize heat generation, using a light source drive unit to manage the emission of light for left-eye and right-eye images, and a projection unit to switch between optical images based on input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If bright synchronization pulses are projected during 3D image projection, then synchronization signal visibility is improved, but heat generation increases
Solution Approach 1:
The patent applies periodic action by controlling light-emitting elements to operate in discrete cycles: activating only during color image formation periods and synchronization periods, then entering off-state periods. This periodic operation allows the system to generate bright synchronization pulses when needed while periodically reducing heat generation through off-states, resolving the contradiction between illumination intensity and temperature control.
Solution Approach 2:
The patent implements dynamics by making the light emission state variable rather than static. The light-emitting elements dynamically switch between on-state (during color image and synchronization periods) and off-state (during off-state periods), allowing the system to adapt brightness and heat generation levels according to operational requirements, thereby resolving the contradiction between synchronization pulse brightness and heat control.
2Reliability
If all light-emitting elements are activated during synchronization periods, then synchronization signal quality is improved, but heat generation and temperature increase
Solution Approach 1:
The patent uses periodic action by structuring the operation into distinct periods: color image formation periods with full light emission for high-quality images, brief synchronization periods with selective light emission for synchronization signals, and off-state periods with all elements off to reduce heat. This periodic structure ensures synchronization signal quality during designated periods while controlling overall heat generation through the off-state periods.
Solution Approach 2:
The patent applies segmentation by dividing the light-emitting elements into groups that can be independently controlled. During synchronization periods, only specific light-emitting elements corresponding to the synchronization signal wavelength are activated, while other elements remain off. This segmentation allows high-quality synchronization signals to be generated with minimal heat generation from selective element activation.
3Reliability
If continuous light emission is used for stable projection, then projection stability is maintained, but heat generation increases requiring larger heat radiation units
Solution Approach 1:
The patent resolves this contradiction through periodic action by implementing cycles of light emission followed by off-states. The projection operates in stable periods (color image formation and synchronization periods) where light is emitted, then transitions to off-state periods where all light-emitting elements are turned off to reduce heat generation. This periodic on-off operation maintains projection stability during active periods while controlling heat generation through rest periods.
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 approach significantly reduces heat generation by ensuring all light-emitting elements are in an off-state during synchronization periods and between them, lowering temperature and improving luminous efficiency, thus enhancing the stability and efficiency of three-dimensional image projection.
Implementation Method 1
a plurality of different types of light-emitting elements configured to emit light of different wavelength ranges
Implementation Method 2
a micromirror element forms an optical image by the overall pixels by a modulating operation of reflecting light from a projection light source in the direction of the projection optical system
Implementation Method 3
The light component which has not been reflected in the direction of the projection optical system, so-called off light is applied to a nonreflecting part set in advance to be converted into heat
Data Source
AI summary
A light emission state of each of the plurality of different types of light-emitting elements is controlled in accordance with i) a color image formation period in which a color image is formed by using light emitted from the different types of light-emitting elements, ii) a synchronization period in which at least two different types of light-emitting elements are simultaneously driven to output a synchronization signal synchronized with projection timing of a left-eye image or a synchronization signal synchronized with projection timing of a right-eye image, and iii) off-state periods between which the synchronization period is interposed, and in which all the light-emitting elements are in the off-state.