Flat Display Dummy Pixel Electrode Reflectivity
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Solution Overview
Problem
High-resolution and large-sized electrophoretic display devices require increased capacitance and improved screen quality, which is not adequately addressed by existing structures, leading to reduced reflectivity and image quality issues.
Innovation Solution
The pixel electrode is extended to cover both the data line and gate line in each pixel region, with a storage electrode providing additional capacitance, and a dummy pixel electrode is used in the peripheral region to enhance reflectivity and reduce assembly defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pixel electrode is extended to cover data line and gate line, then storage capacitance is increased, but device complexity increases
Solution Approach 1:
The pixel electrode is extended to merge with and cover the data line and gate line in the peripheral region, integrating multiple conductive elements into a single continuous structure. This merging approach increases the effective area for charge storage (improving capacitance) while reducing the number of separate components that would otherwise need to be manufactured and assembled, thereby managing device complexity.
2Illumination intensity
If a dummy pixel electrode is formed in the peripheral region, then reflectivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
A dummy pixel electrode is specifically formed in the peripheral region (non-display area) with different properties than the active pixel electrodes. This local modification improves reflectivity in the peripheral region without affecting the main display area, and the dummy electrode serves as a reference structure that simplifies manufacturing alignment rather than increasing precision requirements.
Solution Approach 2:
The dummy pixel electrode is created as a copy or replica of the actual pixel electrode structure in the peripheral region. This copying approach allows the dummy electrode to provide the necessary reflectivity improvement while using the same manufacturing process and materials, thereby not increasing manufacturing precision requirements.
3Object-generated harmful factors
If the pixel electrode covers the data line and gate line, then parasitic capacitance is minimized, but the structure complexity increases
Solution Approach 1:
The pixel electrode is designed to merge with and cover the data line and gate line in the peripheral region, creating a unified conductive structure. This merging eliminates the need for separate connections and reduces the number of interfaces between different conductive elements, thereby minimizing parasitic capacitance while managing structural complexity through integration.
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
This configuration secures sufficient storage capacitance, increases reflectivity, and improves image quality by minimizing parasitic capacitance and kickback voltage, while also reducing assembly defects by maintaining consistent brightness in the peripheral region.
Implementation Method 1
a storage electrode on the first common electrode to provide storage capacitance
Implementation Method 2
extends a pixel electrode disposed in each pixel region of the flat display device such that the pixel electrode covers both a corresponding data line and a corresponding gate line disposed in each pixel region to secure capacitance in each pixel region, and improves reflectivity to improve image quality
Implementation Method 3
An organic electroluminescence display device displays an image using an organic emission layer. A PDP device displays an image using plasma. An electrophoretic device displays an image using charged particles that reflect or absorb light
Data Source
AI summary
A flat display device is provided. The flat display device a substrate divided into an active region for displaying an image and a peripheral region that does not display the image, and includes: a gate line that crosses a data line to define a pixel region in the active region; a thin film transistor in a region near a crossing of the gate line and the data line; a first common electrode in the pixel region; a storage electrode on the first common electrode to provide storage capacitance; a pixel electrode electrically connected with the storage electrode and overlapping the pixel region, the data line, and the gate line; and an ink film covering the active region and the peripheral region, and having microcapsules including charged particles.