Liquid Crystal Display Device with Perpendicular Polarizers
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Solution Overview
Problem
Current transparent LCD devices consume high power to maintain a transparent state and suffer from decreased color reproducibility, leading to image quality degradation.
Innovation Solution
The implementation of a liquid crystal display device with a lower polarizing plate and an upper polarizing plate having perpendicular transmission axes, combined with color filters, allows for a transparent state without power application and enhances color reproducibility by alternating white and colored filters in a matrix arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white pixels are driven to realize an image during the transparent state, then the luminance of the display panel increases, but the color reproducibility of the display panel decreases
Solution Approach 1:
The pixel array is segmented into multiple sub-pixels, each containing a specific color filter (red, green, blue, yellow, cyan, magenta). This segmentation allows each sub-pixel to contribute to color reproduction while collectively maintaining transparency, resolving the contradiction between luminance and color reproducibility.
Solution Approach 2:
Different regions of the display panel have different optical properties. The color filter layer is selectively positioned in certain pixel regions while leaving other regions transparent, allowing local optimization of both color reproduction and transparency characteristics.
2Stability of the object's composition
If the display panel is turned on to maintain a transparent state, then the transparent state is maintained, but the power consumption increases
Solution Approach 1:
The display panel utilizes the natural optical properties of the liquid crystal material and the polarizing plate configuration to maintain transparency without requiring continuous power input. The structure itself provides the transparent state passively, eliminating the need for active power consumption to sustain transparency.
Solution Approach 2:
Instead of using a normally black LCD that requires power to become transparent, this invention inverts the approach by using a configuration that is naturally transparent and only requires power when switching to the display state. The polarizing plates are arranged with perpendicular transmission axes, creating a naturally transparent state.
3Illumination intensity
If a white area is provided in a color filter region to improve optical transmissivity, then the optical transmissivity increases, but the color reproducibility decreases
Solution Approach 1:
The color filter layer is segmented into multiple discrete color filters (red, green, blue, yellow, cyan, magenta) positioned in specific sub-pixel regions. This segmentation allows light transmission through transparent regions while maintaining color reproduction through the filtered regions, avoiding the need for large white areas.
Solution Approach 2:
The display panel employs a composite structure combining transparent regions with colored filter regions in a unified pixel array. This composite approach allows simultaneous achievement of high optical transmissivity through transparent areas and good color reproducibility through selectively positioned color filters.
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 reduces power consumption while maintaining a transparent state and improves display quality by increasing color reproducibility through efficient light transmission and alignment of liquid crystal molecules.
Implementation Method 1
the liquid crystal molecules are configured to change their alignment according to a voltage applied to the liquid crystal layer
Implementation Method 2
a lower polarizing plate configured to have a transmission axis in a first direction; an upper polarizing plate on the liquid crystal layer, the upper polarizing plate including a first polarizing plate and a second polarizing plate, the first polarizing plate having a transmission axis in the first direction, the second polarizing plate having a transmission axis in a second direction perpendicular to the first direction
Implementation Method 3
color filters including a white filter and a colored filter, the white filter overlapping with the first polarizing plate, and the color filter overlapping with the second polarizing plate
Data Source
AI summary
A liquid crystal display (LCD) device, including a lower polarizing plate configured to have a transmission axis in a first direction, a liquid crystal layer on the lower polarizing plate, an upper polarizing plate on the liquid crystal layer, the upper polarizing plate including a first polarizing plate and a second polarizing plate, the first polarizing plate having a transmission axis in the first direction, the second polarizing plate having a transmission axis in a second direction perpendicular to the first direction, and color filters including a white filter and a colored filter, the white filter overlapping with the first polarizing plate, and the color filter overlapping with the second polarizing plate.