PDLC Display Backside Dimming Panel for Ghost Image Suppression
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Solution Overview
Problem
Display devices using polymer dispersed liquid crystals suffer from unwanted reflection on the backside due to linearly polarized light, leading to ghost images and reduced display quality.
Innovation Solution
A display device design incorporating a dimming panel with guest-host liquid crystals and a specific alignment of dichroic dye molecules to absorb linearly polarized light, preventing reflection on a glass member by aligning guest molecules parallel to the absorption axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a glass member is provided on the backside of the display panel, then structural support and protection are improved, but unwanted reflection and ghost images occur due to linearly polarized light
Solution Approach 1:
The patent applies a dimming panel with linearly polarized light-absorbing properties on the backside of the display panel. This dimming panel converts the harmful reflection into benefit by selectively absorbing the linearly polarized light that causes ghost images, while maintaining structural support function of the glass member
Solution Approach 2:
The dimming panel serves as an intermediary layer between the display panel and the glass member. It mediates the interaction of light with the glass member, absorbing problematic polarized light before it can reflect and create ghost images, while allowing the glass member to maintain its structural function
2Illumination intensity
If polymer dispersed liquid crystals are used in the display panel, then high transmittance is achieved, but ghost images and reduced display quality occur due to backside reflection
Solution Approach 1:
The dimming panel with polarized light-absorbing properties converts the harmful backside reflection that degrades display quality into a beneficial solution by selectively absorbing the polarized light components responsible for ghost images, while preserving the high transmittance characteristic of the polymer dispersed liquid crystal display panel
Solution Approach 2:
The dimming panel is specifically positioned on the backside of the display panel where the problem of backside reflection occurs. It provides localized light absorption functionality precisely where needed, without affecting the overall high transmittance performance of the display panel
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
Prevents ghost images and enhances display quality by minimizing backside reflections, improving visibility regardless of ambient light conditions.
Implementation Method 1
a dimming panel with guest-host liquid crystals and a specific alignment of dichroic dye molecules to absorb linearly polarized light
Implementation Method 2
absorb linearly polarized light, preventing reflection on a glass member by aligning guest molecules parallel to the absorption axis
Data Source
AI summary
According to one embodiment, a display device includes a display panel including a polymer dispersed liquid crystal containing a polymer and a liquid crystal molecule in a display area which displays an image, a light source unit provided along an edge portion of the display panel, a glass member located on a side opposite to an observation position of the display panel, and a dimming panel located between the display panel and the glass member and having a guest-host liquid crystal in a dimming area which overlaps the display area. An initial alignment direction of the liquid crystal molecule in the display panel is parallel to an absorption axis in the dimming panel.