Liquid Crystal Panel Pixel Shift Overdrive Response
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Solution Overview
Problem
Existing liquid crystal display apparatuses face challenges in response speed due to the time required for liquid crystal molecule orientation changes, and applying overdrive processes to pixel shift technologies is difficult as they require image signals delayed by one frame.
Innovation Solution
An electro-optic apparatus with an optical path shifting element and an image processing unit that divides the frame period into unit periods, allowing for different pixel shift states and performing an overdrive process to compensate for the response characteristics of the electro-optical panel, thereby improving response speed and achieving pseudo-high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an overdrive process is applied to improve response speed, then response time is reduced, but it becomes difficult to apply to pixel shift technologies that require image signals delayed by one frame
Solution Approach 1:
The patent segments the frame period into multiple unit periods and applies different pixel shift states to each unit period. This segmentation allows the overdrive process to be applied independently to each segment without requiring the entire frame to be delayed, thus resolving the contradiction between improving response speed and maintaining compatibility with pixel shift technology.
Solution Approach 2:
The patent performs preliminary actions by storing necessary image signals in memory units and preparing overdrive compensation values in advance for each unit period. This preliminary preparation enables the overdrive process to execute efficiently without requiring full-frame delays, thereby improving response speed while maintaining system compatibility.
2Manufacturing precision
If pixel shift is applied to achieve pseudo-high resolution, then resolution is improved, but response characteristics of the electro-optical panel deteriorate due to the time required for liquid crystal molecule orientation changes
Solution Approach 1:
By dividing the frame period into multiple unit periods with different pixel shift states, the patent enables the electro-optical panel to start responding to each segment immediately rather than waiting for a complete frame delay. This segmentation resolves the contradiction by allowing resolution enhancement through pixel shift while maintaining fast response characteristics.
Solution Approach 2:
The patent dynamically adjusts the pixel shift state for each unit period based on the electro-optical panel's response characteristics. This dynamic approach allows the system to optimize both resolution and response speed by adapting the pixel shift timing to match the panel's actual response behavior, rather than using a static full-frame delay approach.
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
The solution enables faster response times and improved pseudo-resolution by synchronizing pixel shift states with the overdrive process, reducing storage capacity requirements and enhancing the electro-optical panel's response characteristics.
Implementation Method 1
an optical path shifting element that is capable of changing an optical path of light which is emitted from the electro-optical panel
Implementation Method 2
the orientation states of liquid crystal molecules are defined for the respective pixels. Therefore, the transmittance or the reflectance of the pixels is controlled
Data Source
AI summary
A projector includes a liquid crystal panel, an optical path shifting element which is capable of changing the optical path of light emitted from the liquid crystal panel, and an image processing unit. The optical path shifting element performs pixel shift such that light reaches different positions of a display screen in respective first to fourth unit periods acquired by dividing one frame into four parts. The image processing unit includes a conversion unit which converts a high resolution image signal into a low resolution image signal, and generates an output image signal by performing an overdrive process on the low resolution image signal according to a pixel shift state.