Patterned Electrode Light Path Control for Display Devices
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Solution Overview
Problem
Switchable light shielding films used in display devices face limitations in luminance and temperature-dependent performance, particularly at low temperatures, which affect their ability to control viewing angles effectively.
Innovation Solution
A light path control device with a patterned electrode and a planar heating element is introduced, featuring a light conversion layer with a dispersing liquid and suspended particles, where the electrode is patterned to enhance aperture ratio and luminance, and the heating element stabilizes particle movement across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switchable light shielding film uses electrical behavior particles dispersed in solvent to block or open light path, then viewing angle control mode can be switched, but luminance is reduced in share mode where light path should be opened
Solution Approach 1:
The electrode is divided into multiple independent pattern portions (first pattern portions and second pattern portions) that can be independently controlled. This segmentation allows selective activation of heating regions to improve luminance in specific areas while maintaining viewing angle control functionality across different modes.
Solution Approach 2:
Different regions of the light conversion layer are provided with different local qualities through the patterned electrode structure. The first and second pattern portions create localized heating zones that selectively adjust particle distribution in specific areas, enabling improved luminance in share mode while maintaining private mode functionality in other regions.
2Adaptability or versatility
If switchable light shielding film relies on particle behavior in solvent, then viewing angle control is achieved, but performance varies with ambient temperature especially at low temperatures
Solution Approach 1:
The invention changes the temperature parameter by introducing a heating element that can actively heat the light conversion layer. This parameter change compensates for low-temperature effects on particle behavior, ensuring reliable viewing angle control across different ambient temperatures by maintaining optimal temperature conditions for particle movement.
Solution Approach 2:
The electrode serves multiple functions: it controls the electrical behavior of particles for viewing angle control and simultaneously functions as a heating element to maintain temperature. This multi-functionality ensures reliable performance across temperature variations while maintaining the core viewing angle control capability.
3Illumination intensity
If patterned electrode is used to improve aperture ratio, then luminance is enhanced, but device structure becomes more complex
Solution Approach 1:
The patterned electrode structure serves dual purposes: it patterns the electric field to control particle behavior for viewing angle control, and simultaneously patterns the heating distribution to enhance luminance. This multi-functionality achieves luminance improvement without requiring separate heating elements, thereby limiting the increase in device complexity.
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 ensures improved luminance and optical profile, maintains effective viewing angle control across temperature variations, and enhances switching speed between light-blocking and light-transmitting modes, particularly in low-temperature environments.
Implementation Method 1
blocks or opens a light path through dispersion and condensation of particles using electrical behavior particles dispersed in a solvent
Implementation Method 2
a planar heating element to stabilize movement of the electrical behavior particles even at low temperatures
Data Source
AI summary
A display device includes a light path control device comprising a first substrate, a first electrode disposed above the first substrate, a second substrate disposed on the first substrate, a second electrode disposed below the second substrate, and a light conversion layer disposed between the first electrode and the second electrode and comprising a partition wall portion and a containing portion alternately disposed with each other.