Dichroic Liquid Crystal Viewing Angle Control Cell

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Solution Overview

Problem

Existing LCD devices cannot actively control or switch between wide and narrow viewing angles, limiting user flexibility and display performance.

Innovation Solution

Incorporating a viewing angle control cell with a dichroic liquid crystal layer between substrates, where the tilt angle of liquid crystal molecules is controlled by an electric field to adjust light absorption, allowing switching between wide and narrow viewing angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a wide viewing angle LCD device is used, then the viewing angle is wide, but the viewing angle cannot be switched or controlled

Engineering Contradiction:

Improveviewing angle controlVSAvoiddevice structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent embeds a control cell containing dichroic liquid crystal molecules within the LCD device structure. The control cell is positioned between the backlight unit and the liquid crystal layer, allowing the dichroic liquid crystal to modulate light transmission based on its molecular orientation controlled by electric fields, thereby enabling viewing angle switching without adding external components

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent utilizes the ability of dichroic liquid crystal molecules to change their light absorption properties by altering their tilt angle through electric field control. By applying different voltages to the control cell electrodes, the molecular orientation changes, which dynamically adjusts the light transmission characteristics and enables switching between wide and narrow viewing angle modes

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If dichroic liquid crystal is used to control viewing angle, then viewing angle switching is enabled, but light absorption properties must be modified

Engineering Contradiction:

Improvedisplay mode switchingVSAvoidenergy consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent employs periodic voltage application to the control cell to switch between different viewing angle modes. The liquid crystal molecules respond to alternating electric fields by reorienting their tilt angles, enabling dynamic switching between wide and narrow viewing angle modes through time-dependent electric field control

Inventive Principle:

Principle #19Periodic action

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 dynamic switching between wide and narrow viewing angles by modifying the light absorption properties of the dichroic liquid crystal molecules, enhancing display mode flexibility and performance.

Implementation Method 1

the tilt angle of the liquid crystal molecules is controlled such that off-angle light is decreased to implement a narrow viewing angle mode

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

the tilt angle of liquid crystal molecules is controlled by an electric field to adjust light absorption

Methodology Applied

Scientific EffectLiquid crystal tilt angle control: Electric Field

Data Source

PatentUS7626656B2LCD device for switching display mode between wide viewing angle and narrow viewing angle and method employing control cell for controlling tilt angle of molecules of dichroic liquid crystal layer therein

Publication Date: 2009.12.01 LG DISPLAY CO LTD

AI summary

A liquid crystal display (LCD) device for switching a display mode between a wide viewing angle and a narrow viewing angle includes an LCD panel including an array substrate, a color filter substrate, and a liquid crystal layer formed between inner surfaces of the array substrate and the color filter substrate, and a viewing angle control cell adjacent to the LCD panel, the viewing angle control cell including a lower substrate on which a first electrode is formed, an upper substrate on which a second electrode is formed, and a dichroic liquid crystal layer interposed between the upper substrate and the lower substrate.