Display Apparatus Pixel Shifting for Installation Position
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Solution Overview
Problem
Existing display apparatuses face challenges in correctly projecting images across different installation positions without increasing size or manufacturing cost, particularly in rear and hanging projections, due to the need for complex rotation mechanisms or additional circuit elements.
Innovation Solution
A display apparatus with a control system that alternately outputs image signals and shifts pixels by ½ pixel horizontally and vertically, using a birefringence element and polarization control to adjust image projection based on installation position, eliminating the need for rotation mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rotation mechanism is used to rotate the birefringence element for correct image projection in rear and hanging projections, then the image projection accuracy is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces the mechanical rotation mechanism with a control signal-based system. The control signal unit generates signals that control the display element to invert images horizontally or vertically based on installation position, eliminating the need for physical rotation of the birefringence element while maintaining correct image projection accuracy
Solution Approach 2:
The patent changes the control parameters of the display element (horizontal/vertical inversion) based on installation position rather than physically rotating components. By controlling the display element to output inverted images when needed, the system achieves correct projection without mechanical rotation, reducing device complexity
2Manufacturing precision
If additional circuit elements are added to properly map images based on installation position, then the image projection accuracy is improved, but the device complexity and size increase
Solution Approach 1:
The control signal unit serves multiple functions: it controls the pixel shifting unit for high-resolution display, generates horizontal/vertical inversion control signals based on installation position, and coordinates with the display element drive unit. This multi-functional approach eliminates the need for separate circuit elements for each function, reducing overall device complexity
Solution Approach 2:
The patent merges the installation position detection function, image inversion control function, and pixel shifting control function into a single control signal unit. By combining these functions, the system achieves accurate image mapping without adding separate circuit elements, thus reducing device complexity
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
Enables correct image projection across various installation positions, including rear and hanging projections, with a simple structure that maintains cost-effectiveness and avoids the complexity of rotation mechanisms.
Implementation Method 1
a pixel shifting unit outputting an image as light displayed by the display element while shifting the light by a distance of a 1/2 pixel horizontally and a 1/2 pixel vertically on the predetermined frame-by-frame basis
Implementation Method 2
using a birefringence element and polarization control to adjust image projection based on installation position
Data Source
AI summary
An image signal source alternately outputs two types of image signal. A pixel shifting unit outputs an image as light displayed by a display element having a number of pixels corresponding to the image signal while alternately shifting the light by a distance of a ½ pixel horizontally and a ½ pixel vertically. A horizontal display control unit receives the image signal and, in response to an installation position, changes the received image signal so that an image corresponding to any one of the two types of image signal alternately outputted is horizontally shifted by one pixel. A display element drive unit receives the changed image signal and, in response to the installation position, controls the display element so that the display element displays an image obtained by horizontally inverting the image based on the received image signal.