Liquid Crystal Phase Modulator Polarity Segmentation
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Solution Overview
Problem
Phase modulating liquid crystal displays face issues with voltage offsets leading to unwanted phase shifts and artifacts in 3D scene reconstruction due to capacitive crosstalk and leakage currents, affecting the focusing capability and image quality.
Innovation Solution
A controllable device with a modulator matrix of liquid crystal cells using pairs of voltage values of positive and negative polarity, applied alternately to prevent phase offsets, and a control unit to dynamically adjust polarity area sizes and positions for optimal image reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional voltage inversion schemes are used in phase modulating liquid crystal displays, then amplitude modulation artifacts are reduced, but phase offsets and unwanted artifacts appear due to capacitive crosstalk and leakage currents
Solution Approach 1:
The display is divided into polarity areas where adjacent areas have opposite voltage polarities. This segmentation approach isolates the effects of capacitive crosstalk and leakage currents to local regions, preventing them from causing global phase offsets while maintaining the benefits of voltage inversion for artifact reduction.
Solution Approach 2:
Different polarity areas are assigned different voltage polarities locally, allowing the system to compensate for capacitive crosstalk and leakage currents in a localized manner. This enables phase correction to be applied specifically where needed without affecting the entire display uniformly.
2Duration of action of stationary object
If voltage polarity is alternated to prevent image sticking and chemical degradation, then display longevity is improved, but phase shifts occur affecting 3D scene reconstruction quality
Solution Approach 1:
The display matrix is segmented into multiple polarity areas that maintain different voltage polarities over time. This allows continuous operation with alternating voltages for longevity while maintaining phase uniformity within each polarity area, as the segmentation prevents capacitive crosstalk from causing phase shifts.
Solution Approach 2:
The system dynamically adjusts voltage parameters including polarity assignment and voltage magnitude based on detected phase offsets. This allows the display to maintain both longevity through voltage alternation and phase uniformity through adaptive parameter adjustment.
3Device complexity
If larger polarity areas are used to reduce the number of polarity transitions, then device complexity is reduced, but phase offsets increase at area boundaries affecting image quality
Solution Approach 1:
The polarity area configuration is made dynamic rather than static. The system can adjust the number, size, and arrangement of polarity areas based on the specific display content and detected phase offset patterns, optimizing the balance between complexity and phase uniformity for different operating conditions.
Solution Approach 2:
The system adjusts polarity area parameters such as area size, shape, and voltage magnitude to minimize phase offsets at boundaries. By dynamically changing these parameters, the system maintains low device complexity while preserving phase uniformity across the display.
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 reduces unwanted phase offsets and enhances image quality by ensuring phase values between neighboring pixels are independent of voltage polarities, allowing for sharp and accurate 3D image reconstruction across various display types and sizes.
Implementation Method 1
a modulator matrix having a plurality of liquid crystal (LC) modulator cells each being adapted to modulate a phase value of light passing through said liquid crystal modulator cell depending on a voltage which is applied to said liquid crystal modulator cell
Data Source
AI summary
A controllable device for phase modulation of coherent light comprises a modulator matrix having a plurality of liquid crystal modulator cells each being adapted to modulate a phase value of light passing through a liquid crystal modulator cell depending on a voltage, which is applied to the liquid crystal modulator cell; at least one polarity area of said modulator matrix including at least one liquid crystal modulator cell; at least one storage unit for storing at least one pair of voltage values of which one has a positive and the other has a negative polarity for the liquid crystal modulator cells, whereby the pair of voltage values corresponds to a predetermined phase value; and a control unit for selectively applying one pair of voltage values to one liquid crystal modulator cell.