Tilted Pixel Offset Device Stray Light Management
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Solution Overview
Problem
In non-telecentric optical system projectors, stray light is generated due to direct reflection of light from the pixel offset device into the projection lens, degrading image quality by reducing pixel resolution.
Innovation Solution
A pixel offset device with a tilted transparent panel is positioned between the light valve and the projection lens, where the panel's transparent surface is tilted with respect to the light valve's active surface, preventing stray light from reaching the projection lens by reflecting it towards a light-absorbing heat dissipation component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pixel offset device is disposed between the light valve and the projection lens to increase pixel quality, then pixel resolution is improved, but stray light is generated that degrades image quality
Solution Approach 1:
The patent extracts the harmful reflection function from the pixel offset device by tilting the transparent panel. The transparent panel is tilted at a specific angle (e.g., 45 degrees) relative to the optical axis, causing reflected light to be directed away from the projection lens toward a light-absorbing heat dissipation component, thereby separating the useful pixel offset function from the harmful stray light generation
Solution Approach 2:
The patent converts the harmful reflection of light off the transparent panel into a beneficial effect by directing the reflected light toward a light-absorbing heat dissipation component. The tilt angle is specifically designed to redirect what would otherwise be stray light into a controlled path that absorbs the energy and prevents image degradation
2Object-generated harmful factors
If the transparent panel is tilted to prevent stray light reflection, then stray light is reduced, but the structural complexity of the pixel offset device increases
Solution Approach 1:
The patent merges multiple functions into the tilted transparent panel: it serves as both the pixel offset mechanism (vibrating to enhance resolution) and the stray light redirector (tilted to direct reflection away from the lens). The frame structure is designed to simultaneously provide mechanical support and define the tilt angle, combining structural and optical functions in a single integrated component
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 design effectively prevents stray light from entering the projection lens, thereby enhancing image quality and maintaining high pixel resolution by ensuring that the reflected illumination beam does not contribute to the projected image.
Implementation Method 1
the transparent surface is tilted with respect to the active surface such that the transparent surface reflects a portion of the illumination beam from the light source module and the reflected illumination beam is not transmitted toward the projection lens
Data Source
AI summary
A projector includes a light source module and an optical engine. The light source module provides an illumination beam. The optical engine includes a light valve, a projection lens, and a pixel offset device. The light valve has an active surface, and the active surface converts the illumination beam into an image beam and reflects the image beam. The projection lens projects the image beam from the projector. The pixel offset device is located between the light valve and the projection lens and includes a frame and a transparent panel, the transparent panel is disposed in the frame and includes a transparent surface, the transparent panel is disposed on the transmission path of the illumination beam and the transmission path of the image beam, the frame is configured to drive the transparent panel to vibrate, and the transparent surface is tilted with respect to the active surface.