Projector Focus Adjustment Using Distortion Correction Data
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Solution Overview
Problem
Conventional projectors require photo-detection elements and line sensors for focus adjustment, leading to higher costs and larger sizes, and fail to maintain good picture quality when projecting onto non-flat surfaces due to inadequate focus adjustment strategies.
Innovation Solution
A projector with a display element having a pixelated image-forming surface and a projection lens capable of focus adjustment, utilizing distortion correction data to generate corrected images and adjust focus to maximize the focused area on non-flat surfaces, eliminating the need for photo-detection elements and line sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photo-detection elements and line sensors are used for focus adjustment, then focus adjustment accuracy is improved, but device cost and size increase
Solution Approach 1:
The patent extracts the focus adjustment function from the traditional sensor-based system and implements it through software processing of existing image data. The focus adjustment unit uses distortion correction data and image processing to determine optimal focus positions without requiring dedicated photo-detection elements or line sensors, thereby reducing device complexity while maintaining focus adjustment capability
Solution Approach 2:
The patent makes the image processing unit serve multiple functions: it processes images for display, analyzes distortion correction data, determines focus positions, and controls focus adjustment. This multi-functional approach eliminates the need for separate dedicated sensors, reducing device size and cost while maintaining accurate focus adjustment capability
2Measurement precision
If photo-detection elements and line sensors are used for focus adjustment, then focus adjustment accuracy is improved, but device cost increases
Solution Approach 1:
The patent extracts the focus adjustment function from the traditional sensor-based system and implements it through software processing of existing image data. The focus adjustment unit uses distortion correction data and image processing to determine optimal focus positions without requiring dedicated photo-detection elements or line sensors, thereby reducing device cost while maintaining focus adjustment capability
Solution Approach 2:
The patent enables the projector to perform self-diagnosis and self-adjustment for focus optimization. The image processing unit automatically analyzes the projected image and distortion correction data to determine the optimal focus position, eliminating the need for external sensors or manual adjustment mechanisms, thereby reducing device cost and simplifying manufacturing
3Manufacturing precision
If focus is adjusted for a specific region on non-flat surfaces, then picture quality in that region is improved, but the focused region coverage decreases
Solution Approach 1:
The patent implements dynamic focus adjustment that adapts to the projection surface characteristics. The system analyzes distortion correction data to identify regions of interest and dynamically adjusts focus positions to maximize the covered focused area. This dynamic approach allows the system to optimize focus coverage across non-flat surfaces rather than fixing focus on a single point
Solution Approach 2:
The patent changes the focus parameter based on distortion correction data and image analysis. The focus adjustment unit modifies focus positions dynamically according to the projected image characteristics and surface geometry, enabling the system to maintain good picture quality across larger areas of non-flat surfaces by adjusting focus parameters adaptively
Data Source
AI summary
A projector including: a display unit equipped with an image-forming surface made up of a plurality of pixels; a projection lens that is capable of focus adjustment and that projects an image that is formed on the image-forming surface onto a projection surface; a distortion correction processing unit that, on the basis of distortion correction data for correcting distortion of an image projected onto the projection surface, generates a corrected image by enlarging and/or reducing an image indicated by an input video signal and forms the corrected image on the image-forming surface; and a control unit that adjusts the focus of the projection lens on the basis of the distortion correction data such that a focus range on the projection surface is increased.