Projection Device Light Absorbing Element Stray Light Management
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Solution Overview
Problem
Stray light beams in projection devices using digital micro-mirror technology reduce image quality, and existing solutions like blackening TIR prism surfaces are ineffective and generate heat, potentially damaging components.
Innovation Solution
An imaging module comprising a reflective display element, a prism device with strategically positioned surfaces, and a light absorbing element that directs stray light beams through the prism system for absorption, preventing them from affecting the projected image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If TIR prism surfaces are blackened to absorb stray light beams, then stray light absorption is improved, but heat generation increases causing component damage
Solution Approach 1:
The patent extracts the stray light absorption function from the TIR prism surfaces and relocates it to a separate light absorbing element. This separates the absorption function from the heat-generating surface, allowing effective stray light absorption without the heat generation problem that occurs when prism surfaces are blackened.
Solution Approach 2:
The patent introduces a light absorbing element as an intermediary component between the TIR prism and the stray light beams. This intermediary absorbs the stray light energy without directly exposing the prism surfaces to the full energy load, thereby preventing heat generation in the prism while maintaining effective stray light absorption.
2Object-affected harmful factors
If TIR prism surfaces are blackened to absorb stray light beams, then stray light absorption is improved, but image quality degradation increases
Solution Approach 1:
The patent extracts the stray light absorption function from the TIR prism surfaces and relocates it to a separate light absorbing element. This separates the absorption function from the heat-generating surface, allowing effective stray light absorption without the heat generation problem that occurs when prism surfaces are blackened.
Solution Approach 2:
The patent introduces a light absorbing element as an intermediary component between the TIR prism and the stray light beams. This intermediary absorbs the stray light energy without directly exposing the prism surfaces to the full energy load, thereby preventing heat generation in the prism while maintaining effective stray light absorption.
3Object-affected harmful factors
If TIR prism surfaces are blackened to absorb stray light beams, then stray light absorption is improved, but component reliability decreases
Solution Approach 1:
The patent extracts the stray light absorption function from the TIR prism surfaces and relocates it to a separate light absorbing element. This separates the absorption function from the heat-generating surface, allowing effective stray light absorption without the heat generation problem that occurs when prism surfaces are blackened.
Solution Approach 2:
The patent introduces a light absorbing element as an intermediary component between the TIR prism and the stray light beams. This intermediary absorbs the stray light energy without directly exposing the prism surfaces to the full energy load, thereby preventing heat generation in the prism while maintaining effective stray light absorption.
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
Effectively absorbs stray light beams, enhancing image quality by eliminating their negative impact on the projection device without generating heat, thus protecting the device's components.
Implementation Method 1
The light absorbing element is disposed on a transmission path of the stray light beam exiting the second prism
Implementation Method 2
A stray light beam is incident into the first prism, passes through the third surface and then exits the first prism. Then, the stray light beam is incident into the second prism through the fourth surface
Implementation Method 3
the stray light beam is reflected by the fifth surface and then exits the second prism
Data Source
AI summary
An imaging module includes a reflective display element, a prism device and a light absorbing element. The reflective display element includes a reflective display surface. The prism device includes first and second prisms. The first prism includes first, second and third surfaces. The second prism includes fourth, fifth and sixth surfaces. A stray light beam is incident into the first prism, passes through the third surface and then exits the first prism, then the stray light beam is incident into the second prism through the fourth surface, and then the stray light beam is reflected by the fifth surface and then exits the second prism. The light absorbing element is disposed on a transmission path of the stray light beam exiting the second prism. A projection device including the imaging module is also provided.