Phase Modulation Liquid Crystal Panel Signal Correction
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Solution Overview
Problem
As pixel pitch narrows in liquid crystal panels, increased voltage differences between adjacent pixels lead to disclination, making it difficult to perform normal phase modulation and diffraction, resulting in modulation deviations and reduced modulation efficiency.
Innovation Solution
A lighting apparatus and projector system that includes a phase modulation liquid crystal panel, a modulation signal corrector, and an application voltage generator, which corrects pixel modulation signals based on peripheral pixel signals to reduce deviation and achieve desired modulation amounts by generating appropriate application voltages for each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel pitch is narrowed to increase resolution, then image quality is improved, but voltage difference between adjacent pixels increases causing disclination and modulation failure
Solution Approach 1:
The patent applies preliminary action by measuring the actual voltage applied to each pixel and calculating correction values before phase modulation. The correction value calculation unit computes the difference between desired and actual voltages in advance, and the correction value application unit pre-applies these corrections to the pixel signals, ensuring accurate phase modulation despite voltage differences caused by narrow pixel pitch
Solution Approach 2:
The patent implements feedback by measuring the actual voltage applied to each pixel and using this information to calculate correction values. The correction values are derived from the difference between desired and actual voltages, creating a closed-loop system that compensates for voltage deviations and ensures reliable phase modulation
2Measurement precision
If voltage difference between adjacent pixels is increased, then signal differentiation is improved, but disclination occurs and diffraction performance deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the voltage applied to each pixel based on its actual characteristics. The system measures the actual voltage for each pixel, calculates the deviation from the desired voltage, and applies correction values to optimize the voltage parameter, thereby preventing disclination while maintaining signal differentiation
Solution Approach 2:
The patent implements local quality by applying individualized correction values to each pixel based on its specific voltage characteristics. Instead of uniform treatment, the system measures and corrects the voltage for each pixel independently, ensuring that each pixel operates at its optimal voltage level and preventing local disclination issues
3Speed
If phase modulation is performed with voltage deviations, then modulation speed is maintained, but modulation accuracy and diffraction efficiency decrease
Solution Approach 1:
The patent applies preliminary action by calculating and applying correction values to pixel signals before phase modulation occurs. This pre-correction ensures that the desired voltage is accurately applied to each pixel, maintaining both modulation speed and accuracy without requiring post-modulation adjustments
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 phase modulation at the desired amount in phase modulation liquid crystal panels, improving modulation efficiency by correcting pixel signals and voltages to account for voltage differences between adjacent pixels.
Implementation Method 1
a phase modulation liquid crystal panel that includes a plurality of pixels, the phase modulation liquid crystal panel modulating a phase of light from the light source for each of the pixels
Implementation Method 2
phase modulation liquid crystal panel
Data Source
AI summary
A lighting apparatus according to the disclosure includes: a light source; a phase modulation liquid crystal panel that includes a plurality of pixels, the phase modulation liquid crystal panel modulating a phase of light from the light source for each of the pixels; a modulation signal corrector that performs signal correction that corrects a pixel modulation signal for a target pixel among the plurality of pixels on the basis of a pixel modulation signal for at least one peripheral pixel that is located around the target pixel to reduce a deviation amount relative to a desired amount of modulation for the target pixel; and an application voltage generator that generates an application voltage to be applied to each of the pixels on the basis of the pixel modulation signal having been corrected by the modulation signal corrector.