Cholesteric Self-Powered Display With Busbar Color Masking
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Solution Overview
Problem
Self-powered displays using cholesteric liquid crystal and solar cells suffer from significant visual color discrepancies due to busbars and fingers, leading to degraded image quality, especially when displaying black images.
Innovation Solution
Implement a shielding layer on the busbars with a width less than or equal to 50 μm and a visual color difference (ΔE) of 10 units, using materials like dark ink or adhesive tape, to minimize perceptible color differences between active and inactive surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If busbars and fingers are used in the solar cell layer, then power generation efficiency is improved, but image quality deteriorates due to color discrepancies and stray light reflection
Solution Approach 1:
An optical compensation layer is introduced between the solar cell layer and the cholesteric liquid crystal layer to act as an intermediary element. This layer compensates for the optical path differences caused by busbars and fingers, reducing their visual impact and improving image quality without affecting power generation efficiency.
Solution Approach 2:
The optical compensation layer is designed with specific optical properties that alter the perception of color and light reflection. By adjusting the refractive index and thickness of this layer, the visual appearance of busbars and fingers is modified to reduce color discrepancies and improve overall image quality.
2Power
If the solar cell layer is made opaque for high-efficiency power generation, then power generation efficiency is improved, but display quality deteriorates due to inability to provide black images
Solution Approach 1:
The solar cell layer is segmented into different regions with different transparency characteristics. The active areas maintain opacity for high power generation efficiency, while the inactive areas (where busbars and fingers are located) have modified optical properties to allow better light control for displaying black images.
Solution Approach 2:
Different regions of the solar cell layer are given different optical qualities. The regions under busbars and fingers are treated differently from the active solar cell regions, allowing local optimization of both power generation and display quality in different areas of the display device.
3Reliability
If transparent conductive materials are used for busbars and fingers, then electrical conductivity is improved, but visual color difference increases when displaying black images
Solution Approach 1:
The optical compensation layer serves as an intermediary that masks the visual impact of transparent conductive materials used in busbars and fingers. This layer compensates for the optical differences, reducing the visible color contrast between areas with and without busbars while maintaining the electrical conductivity benefits of transparent materials.
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
Enhances image quality by reducing visual chromatic aberrations, ensuring a color difference of less than 10 units, thereby improving the viewing experience.
Implementation Method 1
a portion of the light beams will be reflected by the cholesteric liquid crystal layer 1, as perceived by the human eye
Implementation Method 2
another portion of the incident light beams traverses the cholesteric liquid crystal layer 1 and is absorbed by the solar cell layer 2
Data Source
AI summary
A self-powered display device includes a display module and a power module. The display module is a cholesteric liquid crystal display module, and the power module is a solar cell module. The display module allows light to enter the power module from the front side, and the power module generates electricity upon receiving the light to provide the necessary energy for the display module to show images. The power module has multiple active areas and multiple inactive areas between the active areas. When the width of the inactive area is less than or equal to 50 μm, the human eye will have difficulty discerning the width of the inactive area. Additionally, a shielding layer can be placed on the inactive area to ensure that the visual color difference (ΔE) between the inactive area and the active area does not exceed 10 color difference units, thereby improving the image quality.