Electronic-ink display panel with variable storage capacitance
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Solution Overview
Problem
Conventional electronic-ink display panels are limited to black-and-white displays, restricting their applications, and face issues with different total capacitances in sub-pixel units when attempting to show colored images.
Innovation Solution
An electronic-ink display panel design featuring an active matrix substrate with pixel units composed of sub-pixel units having different storage capacitor capacitances, combined with an electronic-ink layer containing ink material patterns of varying thickness, material, and overlap areas, ensuring each sub-pixel unit's total capacitance is equal, allowing for colored image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional electronic-ink display panels use uniform storage capacitors in all sub-pixel units, then the device complexity is low, but the total capacitance varies across sub-pixels preventing colored image display
Solution Approach 1:
The patent applies local quality by making each sub-pixel unit's storage capacitor have a specific capacitance value tailored to its requirements. Different sub-pixel units (e.g., red, green, blue) are assigned different storage capacitor capacitances to compensate for variations in display capacitor capacitance, enabling uniform total capacitance across all sub-pixels while achieving colored image display capability
Solution Approach 2:
The patent changes the capacitance parameter of storage capacitors across different sub-pixel units. By adjusting the capacitance values of storage capacitors in response to varying display capacitor characteristics in different sub-pixels, the total capacitance is equalized across all sub-pixel units, thereby enabling colored image display
2Adaptability or versatility
If the ink material patterns have different thicknesses and materials to achieve color display, then the colored image display is enabled, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by allowing ink material patterns to have different thicknesses and materials in different sub-pixel units. Each sub-pixel's ink layer is locally optimized to achieve the desired color while the storage capacitor design compensates for capacitance variations, balancing color display capability with manufacturing feasibility
3Reliability
If the overlap areas between common electrode and pixel electrodes are adjusted to compensate capacitance, then the total capacitance consistency is achieved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by adjusting the overlap area between the common electrode and pixel electrodes in different sub-pixel units. This local adjustment of electrode geometry provides an additional degree of freedom for capacitance compensation, allowing precise control of display capacitor capacitance to achieve uniform total capacitance across all sub-pixels
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
Enables the display of colored images while maintaining consistent total capacitance across sub-pixel units, overcoming the limitations of previous technologies by compensating capacitances through strategic design of storage and display capacitors.
Implementation Method 1
the capacitance of the storage capacitor compensates the capacitance of the display capacitor constituted by the common electrode, one of the ink material patterns, and the pixel electrode corresponding thereto, so that each of the total capacitances is the same
Implementation Method 2
the charged particles includes positively charged particles and negatively charged particles contained in respective microcapsules with a transparent fluid, wherein the color of the positively charged particles and that of the negatively charged particles are different, such as black and white. When the electric fields between the pixel electrodes and the transparent electrode on the TFT array substrate are varied, the positively charged particles and negatively charged particles of different colors will be moved upwards or downwards in accordance with the direction of the electric fields
Data Source
AI summary
An electronic-ink display panel including an active matrix substrate, a front plane laminate and an electronic-ink layer is provided. The active matrix substrate has multiple pixel units. Each pixel unit includes multiple sub-pixel units, and each sub-pixel unit has a storage capacitor. In the same pixel unit, the capacitance of the storage capacitor of at least one sub-pixel unit is different from those of the storage capacitors of the other sub-pixel units. The front plane laminate is disposed above the active matrix substrate and the electronic-ink layer is disposed between the active matrix substrate and the front plane laminate.