Electro-optical Device Pixel Shift Gradation Control
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Solution Overview
Problem
The subfield driving method for liquid crystal elements in electro-optical devices, when combined with pixel shift technology, results in a decrease in the number of gradation levels expressible by the pixel, leading to reduced image resolution.
Innovation Solution
An electro-optical device incorporating an optical path shift element, a determining unit, and a designation signal generating unit that adjusts the optical path and designates the on-state or off-state of pixels to maintain or enhance gradation levels, allowing the pixel to express higher gradation levels by shifting the optical path for different unit periods and determining the difference in gradation levels to generate appropriate designation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel shift technology is applied to increase resolution, then image resolution is improved, but the number of gradation levels expressible by the pixel decreases
Solution Approach 1:
The display period is divided into multiple unit periods, each containing multiple subfields. By segmenting the control into different time units (unit periods vs. subfields), the system can apply pixel shift at the unit period level while maintaining full gradation control within each subfield, thus resolving the contradiction between resolution enhancement and gradation level preservation
Solution Approach 2:
The patent dynamically adjusts the optical path position based on the unit period timing, shifting the optical path for different unit periods while maintaining the ability to control gradation levels within each subfield. This dynamic control allows simultaneous achievement of resolution improvement through pixel shift and gradation level maintenance through subfield-based voltage control
2Measurement precision
If the display period is divided into unit periods with fewer subfields, then pixel shift can be applied to improve resolution, but the gradation control capability is reduced
Solution Approach 1:
The patent introduces a temporal dimension to the control structure by creating multiple unit periods within a display period, where each unit period can be assigned to different optical path positions. This dimensional expansion allows the system to achieve both resolution improvement through spatial shifting and maintain gradation control through temporal segmentation
Data Source
AI summary
An electro-optical device includes an optical path shift element that changes a path of light by a first and second period including α SFs; a determining unit that determines whether or not a difference between a first gradation displayed for the first period and a second gradation displayed for the second period is larger than a threshold value; and a designation signal generating unit that generates a designation signal designating an on or off-state of the pixel for the SFs, in a case where a result of the determination is negative, the designation signal designates the on or off-state of the pixel so that the pixel displays a display gradation for the first and second period based on at least one of the first and second gradation, and each of the first, second, and display gradation is a gradation expressible by the on or off-state for the 2α SFs.