Cholesteric LCD Panel for Local Writing and Partial Erasing
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Solution Overview
Problem
Current cholesteric liquid crystal display devices consume excessive energy due to applying the same voltage to all pixels simultaneously, lacking local control and preventing partial erasing of written positions.
Innovation Solution
An electronic device with a panel comprising intersecting scan and data electrodes and a cholesteric liquid crystal layer, allowing for distinct voltage differences to be applied to specific areas for writing and erasing, enabling local control and partial erasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the same voltage is applied to all pixels simultaneously, then the display can maintain uniform operation, but energy consumption increases and local control is lost
Solution Approach 1:
The patent divides the display panel into multiple regions (writing area and non-writing area) and applies different voltage differences to each region. The writing area receives a first voltage difference while the non-writing area receives a second voltage difference, enabling localized control and reducing overall energy consumption by avoiding uniform voltage application across the entire panel.
Solution Approach 2:
The patent implements local quality by applying different voltage differences to different spatial regions of the display. The writing area receives a first voltage difference optimized for local writing operations, while the non-writing area receives a second voltage difference, allowing each region to operate with appropriate parameters for its specific function.
2Adaptability or versatility
If the same voltage is applied to all pixels simultaneously, then the display structure remains simple, but partial erasing of written positions becomes impossible
Solution Approach 1:
The patent segments the display into writing area and non-writing area, applying different voltage differences to each. This segmentation enables the writing area to receive specialized voltage treatment for erasing operations while the non-writing area maintains its own voltage profile, achieving partial erasing capability without requiring complete system redesign.
Solution Approach 2:
The patent introduces dynamic voltage control where the voltage difference applied to different regions can be adjusted based on operational mode (writing or erasing). The controller dynamically selects appropriate voltage differences for the writing and non-writing areas based on the current operation, enabling versatile functionality including partial erasing.
3Ease of operation
If different voltage differences are applied to writing and non-writing areas, then local control and partial erasing are enabled, but the control system becomes more complex
Solution Approach 1:
The patent implements a controller that can handle multiple functions (writing and erasing operations) using a unified approach of applying different voltage differences to different regions. The same basic mechanism of regional voltage differentiation serves multiple purposes including local control, writing, erasing, and energy saving, reducing the need for separate dedicated circuits for each function.
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
Reduces energy consumption by allowing selective voltage application, achieving local writing and erasing without consuming excessive power.
Implementation Method 1
a cholesteric liquid crystal layer disposed between the plurality of scan electrodes and the plurality of data electrodes
Data Source
AI summary
An electronic device includes a panel. The panel includes a plurality of scan electrodes, a plurality of data electrodes and a cholesteric liquid crystal layer. The plurality of data electrodes and the plurality of scan electrodes are intersected with each other to define a plurality of pixels. The cholesteric liquid crystal layer is disposed between the plurality of scan electrodes and the plurality of data electrodes. In a writing mode, a first voltage difference is applied to at least one pixel disposed in a writing area, and a second voltage difference is applied to at least a portion of the other pixels disposed in a non-writing area. In an erasing mode, a third voltage difference is applied to at least one pixel disposed in an erasing area, where the first voltage difference is different from the second voltage difference, and the first voltage difference is different from the third voltage difference.