Electrowetting Pixel Electrode With Overlapping Storage Capacitor
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Solution Overview
Problem
Electrowetting display panels face challenges in achieving high opening rates and overall display brightness, particularly in bright states, due to the active driving structure and interference textures like moiré from stacked structures.
Innovation Solution
The pixel array substrate is designed with a substrate and multiple pixel units, each including an active device, a pixel electrode with openings, and a storage capacitor that overlaps part of the openings. This configuration ensures that the storage capacitor is shielded by the ink layer in bright states, enhancing the opening rate and display brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an active driving structure with electronic components is used, then the pixel units can be controlled to display, but the opening rate of the display unit is reduced and the structure is easily visible
Solution Approach 1:
The storage capacitor is moved from a lateral arrangement to an overlapping arrangement with the pixel electrode openings, utilizing the vertical dimension (stacking direction) to relocate components. This allows the capacitor to be positioned in the third dimension rather than consuming lateral space, thereby maintaining high opening rates while preserving display control functionality
Solution Approach 2:
The storage capacitor is nested within the vertical space above the substrate, overlapping with the pixel electrode openings. This nesting approach allows the capacitor to occupy vertical space rather than lateral space, enabling both control functionality and high opening rate to coexist
2Adaptability or versatility
If multiple electrowetting display panels are stacked for color display, then color display capability is achieved, but interference textures (moiré) appear and display quality decreases
Solution Approach 1:
By relocating electronic components to the vertical dimension through overlapping arrangements, the lateral periodicity of the display structure is reduced. This dimensional shift minimizes the formation of moiré patterns when multiple panels are stacked, as the interference patterns require lateral periodic structures to form
3Reliability
If the storage capacitor is disposed laterally adjacent to the pixel electrode, then the capacitor can be electrically connected, but the opening rate is reduced due to component placement
Solution Approach 1:
The storage capacitor is arranged to overlap with the pixel electrode openings in the vertical direction rather than being placed laterally adjacent. This vertical stacking maintains electrical connection reliability through proper conductive layer design while eliminating lateral space occupation, thereby preserving high opening rates
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 increases the opening rate of the electrowetting display panel in bright states, thereby improving display brightness and addressing issues related to moiré interference and electronic component placement.
Implementation Method 1
When no voltage is applied, the ink layer is filled with pixel cells. This causes an incident light to be absorbed by the ink layer and pixel units to appear in a dark state.
Implementation Method 2
a voltage is applied to the ink layer to shrink it and a reflective layer below the ink layer is exposed in a display unit, such that the incident light is reflected by the reflective layer
Implementation Method 3
An electrowetting display panel is a display panel that may be applied to e-books and e-papers
Data Source
AI summary
A pixel array substrate including a substrate and multiple pixel units is provided. The pixel units are disposed on the substrate, and each include at least one active device, a pixel electrode and at least one storage capacitor. The pixel electrode is electrically connected to the at least one active device, and has multiple openings. The at least one storage capacitor is electrically connected to the pixel electrode and the at least one active device. The at least on storage capacitor completely overlaps a part of the openings of the pixel electrode. An electrowetting display panel adopting the pixel array substrate is also provided.