Dual Side View Waveguide LCD Light Bleeding
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Solution Overview
Problem
Transparent displays often suffer from light bleeding, where images intended for one side of the display are visible on the opposite side, causing undesirable optical effects and privacy issues.
Innovation Solution
A dual side view waveguide liquid crystal display is designed with inside and outside transparent layers and liquid crystal pixels, where blocking layers prevent scattered light from propagating through the wrong transparent layer, allowing independent images to be displayed on both sides without light bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent displays are used to display images on one side, then the display transparency is improved, but light bleeding occurs causing images to appear on the opposite side
Solution Approach 1:
The display is segmented into multiple independent transparent layers (first transparent layer, second transparent layer) with blocking layers positioned between them. Each layer can independently display images without light bleeding to other sides, as the blocking layers prevent cross-contamination of light between segments.
Solution Approach 2:
Different regions of the display have different optical properties. The blocking layers are strategically positioned at specific locations between transparent layers to block light in specific directions while maintaining transparency in other regions. This allows local control of light propagation to prevent bleeding while preserving overall transparency.
2Object-generated harmful factors
If blocking layers are added to prevent light bleeding, then light bleeding is reduced, but the device structure becomes more complex
Solution Approach 1:
Multiple functions are merged into the blocking layers, which simultaneously serve as structural support elements and optical blocking elements. The transparent layers are also designed to perform multiple functions including light transmission, image display, and structural integrity, reducing the need for separate components.
Solution Approach 2:
The transparent layers and blocking layers are designed as multi-functional components. The transparent layers not only transmit light but also provide structural support and serve as substrates for liquid crystal pixels. The blocking layers simultaneously block light and maintain the mechanical structure of the display assembly.
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 effectively blocks scattered light, ensuring that images intended for one side of the display do not bleed through to the other side, enhancing privacy and reducing unwanted optical effects, while allowing for distinct images to be displayed on both the inside and outside of the display.
Implementation Method 1
a plurality of inside view liquid crystal (LC) pixels and a plurality of outside view LC pixels disposed within the waveguide
Implementation Method 2
a plurality of outside blocking layers configured to block light scattered in the plurality of inside view LC pixels from propagating through the outside transparent layer
Data Source
AI summary
A dual side view display includes a waveguide with an inside transparent layer and an outside transparent layer spaced apart from and parallel to the inside transparent layer, and a plurality of inside view liquid crystal (LC) pixels and a plurality of outside view LC pixels disposed within the waveguide. The plurality of outside view LC pixels are disposed within the waveguide parallel to and in-plane with the plurality of inside view LC pixels. The plurality of inside LC pixels includes a plurality of outside blocking layers configured to block light scattered in the plurality of inside view LC pixels from propagating through the outside transparent layer. Also, the plurality of outside view LC pixels includes a plurality of inside blocking layers configured to block light scattered in the plurality of outside view LC pixels from propagating through the inside transparent layer.