Self-Powered Cholesteric Display With Shielded Solar Cell Busbars
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Solution Overview
Problem
Self-powered display devices with opaque or light-transmitting solar cells suffer from significant image quality degradation due to visual color differences and stray light reflections from metal busbars and fingers, leading to reduced overall image quality.
Innovation Solution
A self-powered display device is designed with a cholesteric liquid crystal display module and a solar cell module, where the solar cell module features active and inactive surfaces with a visual color difference of no more than 10 color difference units, and a shielding layer is applied to the inactive surfaces to minimize color discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If metal busbars and fingers are used in the solar cell layer, then power generation efficiency is improved, but image quality deteriorates due to color differences and stray light reflections
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the solar cell layer and the cholesteric liquid crystal layer. This shielding layer specifically covers the metal busbars and fingers, blocking stray light reflections from reaching the display area. The shielding layer acts as a mediator that allows the metal structures to remain for power generation while preventing their harmful optical effects from degrading image quality.
Solution Approach 2:
The shielding layer is applied selectively only to the regions containing metal busbars and fingers, rather than uniformly across the entire solar cell layer. This localized application maintains the necessary metal structures for power generation in those specific areas while preventing stray light reflections only where needed, thus preserving image quality without compromising overall power generation efficiency.
2Illumination intensity
If transparent solar cells are used, then light transmission is improved, but color difference between busbar regions and adjacent regions increases
Solution Approach 1:
The shielding layer serves as an intermediary that compensates for the color differences introduced by transparent solar cells. By covering the metal busbars and fingers with the shielding layer, the color uniformity across the display area is restored, making the busbar regions visually indistinguishable from adjacent regions while maintaining the light transmission properties of transparent solar cells.
3Power
If opaque solar cells are used, then power generation efficiency is improved, but stray light reflections from metal structures degrade display quality
Solution Approach 1:
The shielding layer acts as a mediator that blocks stray light reflections from metal busbars and fingers before they can reach the display area. This intermediary component allows opaque solar cells to maintain their high power generation efficiency while eliminating the harmful stray light reflections that would otherwise degrade display quality.
Solution Approach 2:
The shielding layer converts the harmful stray light reflections from metal structures into a beneficial solution by absorbing or blocking these reflections. The metal busbars and fingers continue to function for power generation, but their harmful optical effects are transformed into an opportunity to enhance display quality through the shielding layer.
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 minimizes visual color differences between active and inactive surfaces, enhancing image quality and user experience by reducing chromatic aberrations and stray light reflections.
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
Implementation Method 3
Stray light beams that penetrate the solar cell layer 2 are subsequently absorbed by the light-absorbing layer 3
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.