Projector Guide Image Focus Adjustment Pattern
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Solution Overview
Problem
Existing projectors face difficulties in adjusting the focus of tilted projections, as the focus depth is shallower at the image's edges compared to the center, leading to blurring issues when adjusting focus based on central menu screens.
Innovation Solution
A projector design that includes a guide image with a focus adjustment pattern in the peripheral zone on the tilt direction side, allowing for easy focus adjustment of tilted projections by using a larger focus adjustment pattern and auxiliary patterns on the guide image, which can be recognized easily and adjusted without switching screens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If focus adjustment is performed with reference to the menu screen displayed in the central portion of the screen, then the focus in the central portion can be achieved, but the focus depth in the end portion on the tilt direction side becomes insufficient causing image blurring
Solution Approach 1:
The patent places the focus adjustment pattern specifically in the peripheral zone on the tilt direction side where the focus depth is shallowest and most critical. This localized approach ensures that the most difficult-to-focus area receives dedicated attention, allowing the projector to achieve uniform focus across the entire screen including the problematic peripheral regions
2Measurement precision
If a separate focus adjustment screen is used, then accurate focus adjustment can be achieved, but the operation complexity increases requiring screen switching
Solution Approach 1:
The patent combines the focus adjustment pattern with the guide image that is already displayed during installation. The focus adjustment pattern is integrated into the peripheral zone of the guide image, allowing users to perform both image positioning and focus adjustment in a single view without switching between different screens or modes
3Ease of operation
If the focus adjustment pattern is placed in the central portion of the screen, then it is easy to recognize, but it cannot address the focus depth issue in the peripheral zone on the tilt direction side
Solution Approach 1:
The patent deliberately places the focus adjustment pattern asymmetrically in the peripheral zone on the tilt direction side rather than in the central portion. This asymmetric positioning strategically targets the area with the shallowest focus depth, ensuring that the pattern serves its primary function of enabling accurate focus adjustment in the most critical region
Data Source
AI summary
A projector according to an aspect includes a light source device, a light modulation device adapted to modulate light from the light source device to form image light, a projection optical system adapted to perform tilted projection of the image light input from the light modulation device to display an image, and a guide display section adapted to display a guide image used for fitting the image projected by the projection optical system to a screen, the guide image is provided with a focus adjustment pattern forming area disposed in a central portion in a direction perpendicular to a tilt direction in a peripheral zone on the tilt direction side, and a focus adjustment pattern is formed in the focus adjustment pattern forming area.