Electrooptic Apparatus Ionic Impurity Capture Electrode
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Solution Overview
Problem
Existing electrooptic apparatuses, such as liquid crystal and organic EL devices, suffer from display defects like corner staining, display unevenness, and burn-in due to the diffusion of ionic impurities from outside the display region, which are not effectively addressed by current technologies.
Innovation Solution
The electrooptic apparatus incorporates a substrate with a first conductive member and a second conductive member positioned closer to the edge, featuring a second pixel electrode with a non-coupled portion and a coupled portion around the first portion, creating a transverse electric field to capture ionic impurities in specific regions, thereby preventing their diffusion into the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel electrode structure is used, then the device structure is simple, but ionic impurities diffuse from outside the display region causing display defects
Solution Approach 1:
The pixel electrode is divided into multiple independent conductive members (first conductive member, second conductive member, third conductive member) with different electrical coupling configurations. This segmentation allows each member to serve specific functions: the first and third members are electrically coupled to capture ionic impurities, while the second member remains non-coupled to prevent impurity diffusion into the display region.
Solution Approach 2:
The second conductive member acts as an intermediary barrier between the ionic impurity source (outside the display region) and the display region. By being electrically non-coupled to the second conductive member, it creates an electrical potential difference that prevents ionic impurities from diffusing into the display region, serving as a protective mediator.
2Reliability
If no additional conductive members are added, then the device complexity is low, but ionic impurities cause display defects such as corner staining and burn-in
Solution Approach 1:
Different regions of the pixel electrode structure are assigned different electrical coupling properties. The first and third conductive members are electrically coupled to the conductive substrate to create a potential gradient for capturing ionic impurities, while the second conductive member is electrically non-coupled to act as a barrier. This local differentiation of electrical properties enables targeted protection against ionic impurity diffusion.
Solution Approach 2:
The conductive members are configured in advance during manufacturing to create an electrical field that proactively prevents ionic impurity diffusion. The second conductive member is intentionally designed to be electrically non-coupled, creating a potential barrier before ionic impurities can reach the display region, thus preventing display defects before they occur.
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 effectively captures ionic impurities, reducing the occurrence of display defects like corner staining, unevenness, and burn-in, thereby enhancing the reliability and performance of the electrooptic apparatus.
Implementation Method 1
creating a transverse electric field to capture ionic impurities in specific regions
Implementation Method 2
capture ionic impurities in specific regions, thereby preventing their diffusion into the display area
Data Source
AI summary
An electrooptic apparatus includes a substrate, a first conductive member provided on one side of the substrate, a first pixel electrode electrically coupled to the first conductive member, a second conductive member provided on the one side of the substrate, and disposed further close to an edge of the substrate than the first pixel electrode, and a second pixel electrode electrically coupled to the second conductive member. The second pixel electrode includes a first portion not electrically coupled to the second conductive member, and a second portion electrically coupled to the second conductive member and disposed around and spaced apart from the first portion in plan view.