Display Device Insulating Layer Segmentation Leakage Current
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Solution Overview
Problem
As the resolution of organic electroluminescence (EL) display devices increases, the proximity of pixels leads to a significant leakage current in the transverse direction, causing adjacent pixels to emit light unintentionally and deteriorating the display quality.
Innovation Solution
The display device incorporates a configuration with a first and second pixel electrode, an insulating layer, a common layer, and light-emitting layers with different emission starting voltages, where the light-emitting layers are arranged such that the region with a higher emission starting voltage is separated from the end portion of the adjacent light-emitting layer to reduce leakage current and unintended light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between pixels is reduced to increase resolution, then the definition of the display device is improved, but leakage current flows between adjacent pixels causing unintended light emission
Solution Approach 1:
The insulating layer is divided into multiple regions including a first insulating region and a second insulating region with different insulating strengths. The first insulating region is positioned between adjacent pixels to block leakage current, while the second insulating region allows normal operation. This segmentation enables the structure to simultaneously achieve high resolution and prevent leakage current-induced light emission.
Solution Approach 2:
Different regions of the insulating layer are assigned different insulating properties tailored to their specific functions. The first insulating region has high insulating strength to prevent leakage current between adjacent pixels, while the second insulating region has lower insulating strength to maintain normal pixel operation. This local differentiation resolves the contradiction between preventing leakage and maintaining display functionality.
2Measurement precision
If the distance between pixels is reduced to increase resolution, then the definition of the display device is improved, but adjacent pixels emit light unintentionally due to leakage current
Solution Approach 1:
The insulating layer is segmented into functional regions with different insulating characteristics. The first insulating region specifically targets leakage current paths between adjacent pixels, while the second insulating region preserves normal pixel function. This segmentation enables high resolution display while maintaining display quality by preventing unintended light emission.
Solution Approach 2:
The insulating layer acts as an intermediary structure between adjacent pixels, with specific regions designed to mediate the electrical interaction. The first insulating region serves as a barrier to prevent leakage current from causing unintended light emission in adjacent pixels, thereby maintaining display quality at high resolutions.
3Use of energy by moving object
If the light-emitting layer is positioned close to the pixel electrode to improve efficiency, then energy efficiency is improved, but leakage current causes unintended light emission in adjacent pixels
Solution Approach 1:
The insulating layer is segmented into regions with different insulating strengths positioned at different locations relative to the pixel electrode. This allows the light-emitting layer to be efficiently positioned near the pixel electrode for high energy efficiency, while the first insulating region prevents leakage current from causing unintended light emission in adjacent pixels.
Solution Approach 2:
Different regions of the insulating layer have different insulating properties tailored to their specific functions. The first insulating region has high insulating strength to prevent leakage current and unintended light emission, while allowing the light-emitting layer to maintain efficient positioning near the pixel electrode for optimal energy efficiency.
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 suppresses unintended light emission by increasing the distance between the light-emitting regions and the adjacent pixel electrodes, thereby reducing the leakage current and enhancing the display quality by preventing unwanted light emission.
Implementation Method 1
a first light-emitting layer arranged on the first common layer, and overlapping the first pixel electrode, a second light-emitting layer arranged on the first common layer, and overlapping the second pixel electrode, and having a lower emission starting voltage than that of the first light-emitting layer
Data Source
AI summary
A display device includes a first pixel electrode, a second pixel electrode arranged in a first direction and spaced apart from the first pixel electrode, an insulating layer having a first opening exposing at least a portion of a top surface of the first pixel electrode and a second opening exposing at least a portion of a top surface of the second pixel electrode, a first common layer arranged on the first pixel electrode, the second pixel electrode, and the insulating layer, a first light-emitting layer arranged on the first common layer, and overlapping the first pixel electrode, a second light-emitting layer arranged on the first common layer, overlapping the second pixel electrode, and having a lower emission starting voltage than that of the first light-emitting layer, and a counter electrode arranged on the first light-emitting layer and the second light-emitting layer.