See-through LCD with Polarizer Opening for Light Transmittance
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Solution Overview
Problem
Conventional see-through liquid crystal displays suffer from reduced transmittance of external light due to polarizers on both sides of the display panel.
Innovation Solution
A see-through liquid crystal display apparatus is designed with a first substrate partitioned into image-displaying and light-transmitting regions, featuring a wire-grid polarizer with openings in the light-transmitting region, and a second polarizer with perpendicular polarization axes, reducing the number of elements in the light-transmitting region to enhance transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarizers are placed on both sides of the display panel, then image display capability is improved, but transmittance of external light decreases
Solution Approach 1:
The display panel is divided into a first region for image display and a second region for high transmittance. In the second region, one of the polarizers is removed or replaced with a transparent structure, allowing external light to pass through while the first region maintains both polarizers for proper image display functionality.
Solution Approach 2:
Different regions of the display panel have different optical properties: the first region has both polarizers for image display, while the second region has enhanced transmittance by removing or modifying one polarizer, creating local optimization for different functional requirements.
2Illumination intensity
If the number of elements in the light-transmitting region is reduced, then transmittance is improved, but image display function may be compromised
Solution Approach 1:
The display panel is segmented into functional regions where image display elements (polarizers, liquid crystal, electrodes) are present in the first region but removed or minimized in the second region, allowing each region to optimize for its specific function without compromising the other.
Solution Approach 2:
The patent introduces a spatial dimension by dividing the display panel into multiple regions with different functional configurations, allowing simultaneous optimization of image display and light transmittance in different areas of the same device.
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 configuration improves transmittance by minimizing the number of elements in the light-transmitting region, allowing for better recognition of external backgrounds while maintaining image display capabilities.
Implementation Method 1
a first polarizer on one side of the first substrate; and a second polarizer on one side of the second substrate, wherein at least one of the first polarizer and the second polarizer includes an opening positioned in the second region
Implementation Method 2
The LCD applies an electric field to the liquid crystal layer and thus a direction in which liquid crystal molecules are arranged is changed, thereby allowing a transmittance difference to be perceived on a screen
Data Source
AI summary
A liquid crystal display apparatus includes a first substrate partitioned into a first region which displays an image and a second region through which external light passes, a second substrate facing the first substrate, a liquid crystal layer between the first substrate and the second substrate, a first polarizer on one side of the first substrate, and a second polarizer on one side of the second substrate, wherein at least one of the first polarizer and the second polarizer includes an opening positioned in the second region.