Segmented Liquid Crystal Modulator Reducing Cross-Talk

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing liquid crystal modulation devices face challenges with electrical cross-talk and power consumption due to capacitive coupling in large area polarization control panels, which affect optical performance and response times.

Innovation Solution

A segmented polarization control panel is divided into subsegments that are driven synchronously and out-of-phase, with waveforms mirrored about a common electrode, reducing electrical cross-talk and allowing current flow between subsegments to minimize power consumption and response times.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a large area polarization control panel is used, then the display area is increased, but electrical cross-talk and power consumption increase due to capacitive coupling

Engineering Contradiction:

Improvedisplay areaVSAvoidpower consumption

Core Design Contradiction:

Area of stationary objectVSLoss of energy

Solution Approach 1:

The polarization control panel is divided into multiple independently addressable segments. Each segment can be driven with opposite polarity waveforms, allowing charge to be confined within segments rather than redistributing across the entire large area panel. This segmentation reduces capacitive coupling effects and power consumption while maintaining large display area.

Inventive Principle:

Principle #1Segmentation

2Area of stationary object

If a large area polarization control panel is used, then the display area is increased, but response times increase due to charge redistribution across the common electrode

Engineering Contradiction:

Improvedisplay areaVSAvoidresponse time

Core Design Contradiction:

Area of stationary objectVSLoss of time

Solution Approach 1:

By segmenting the panel into independently controlled regions, charge redistribution is limited to within each segment rather than across the entire large area. This reduces the time constant for charge redistribution and improves response times while maintaining large display area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Opposite polarity waveforms are applied alternately to different segments, creating a periodic charge redistribution pattern that prevents cumulative charge buildup and reduces the overall response time for the large area panel.

Inventive Principle:

Principle #19Periodic action

3Loss of energy

If segments are driven with opposite polarity waveforms, then power consumption is reduced, but electrical cross-talk may increase

Engineering Contradiction:

Improvepower consumptionVSAvoidelectrical cross-talk

Core Design Contradiction:

Loss of energyVSObject-generated harmful factors

Solution Approach 1:

The harmful capacitive coupling effect is extracted and isolated to specific segment boundaries. By carefully designing the segment structure and drive waveforms, the cross-talk is contained and managed rather than allowing it to propagate across the entire panel, thus reducing overall power consumption while controlling cross-talk.

Inventive Principle:

Principle #2Taking out (Extraction)

4Reliability

If the panel is divided into subsegments with mirrored waveforms, then optical performance is improved, but device complexity increases

Engineering Contradiction:

Improveoptical performanceVSAvoiddrive circuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Adjacent subsegments are merged into larger segments that share common electrodes. This merging reduces the total number of independent drive circuits needed while maintaining the optical performance benefits of mirrored waveforms. The complexity is reduced by combining control functions at the segment level rather than requiring independent control of each subsegment.

Inventive Principle:

Principle #5Merging (Combining)

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

This approach yields identical optical responses for each subsegment, reducing power consumption by approximately half and decreasing response times by 20-50%, while minimizing charge redistribution across the common electrode.

Implementation Method 1

Split segmented liquid crystal modulator

Methodology Applied

Scientific EffectLiquid crystal modulation: Liquid Crystals

Implementation Method 2

polarization control panel

Methodology Applied

Scientific EffectPolarization control: Polarisation

Implementation Method 3

allowing current on the common electrode to flow between the subsegments reducing power

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 4

electrical cross-talk associated with capacitive coupling to a common electrode

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Data Source

PatentUS8913205B2Split segmented liquid crystal modulator

Publication Date: 2014.12.16 REALD INC

AI summary

Disclosed is a segmented liquid crystal modulator panel apparatus and method for driving the same that overcomes electrical cross-talk associated with capacitive coupling to a common electrode. Each modulator segment may be divided into subsegments and driven substantially synchronously and out-of-phase. The field-polarity insensitive LC materials yield a substantially identical optical response for each subsegment, while allowing current on the common electrode to flow between the subsegments, thereby reducing power consumption and decreasing response times.