Display Electrode Isolation Structure for Pixel Leakage Blocking
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Solution Overview
Problem
Existing display devices face challenges in preventing leakage currents between pixels, which can affect the efficiency and reliability of the display.
Innovation Solution
A display device is designed with a substrate having defined display and non-display areas, featuring pixels with pixel electrodes, light emitting layers, and a common electrode. An insulating layer with a lower and upper insulating layer is positioned between emission areas of the pixels and the non-display area, and a conductive pattern is applied on this insulating layer, receiving a first voltage to block leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-layer insulating structure is used, then the manufacturing process is simpler, but leakage currents between pixels cannot be effectively prevented
Solution Approach 1:
The insulating layer is divided into multiple layers (first insulating layer, second insulating layer, and third insulating layer) with different materials and functions. The first insulating layer provides basic insulation, the second insulating layer enhances barrier properties, and the third insulating layer provides planarization and additional insulation, collectively preventing leakage currents between pixels
Solution Approach 2:
Different insulating layers are made from different materials (e.g., silicon oxide, silicon nitride, organic insulating materials) with complementary properties. This composite structure combines the advantages of each material to achieve superior insulation performance compared to a single-layer structure
2Productivity
If pixel spacing is reduced to increase pixel density, then display resolution improves, but leakage currents between adjacent pixels increase
Solution Approach 1:
Instead of relying solely on horizontal spacing between pixels, the solution extends insulation into the vertical dimension with multiple stacked insulating layers. This multi-layer vertical structure provides enhanced current blocking paths, allowing pixels to be placed closer together horizontally while maintaining reliable electrical isolation through the thickened vertical insulation barrier
3Reliability
If separate electrodes or lines are added to block leakage currents, then leakage prevention improves, but manufacturing complexity and device structure increase
Solution Approach 1:
The multi-layer insulating structure serves multiple functions simultaneously: it provides electrical insulation between pixels, acts as a barrier layer, offers planarization for subsequent processing, and eliminates the need for separate leakage-blocking electrodes or lines. This integrated approach prevents leakage currents while simplifying the overall device structure compared to adding dedicated blocking elements
Data Source
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AI summary
A display device includes a substrate, on which a display area and a non-display area are defined, pixels disposed on the substrate, where the pixels include pixel electrodes disposed in emission areas positioned in the display area, light emitting layers disposed on the pixel electrodes, and a common electrode disposed on the light emitting layers, an insulating layer disposed on the substrate and positioned in a non-emission area between the emission areas of the pixels and the non-display area, and a conductive pattern disposed on the insulating layer to be separated from the pixel electrodes of the pixels, where a first voltage is applied to the conductive pattern. The insulating layer includes a lower insulating layer positioned between the pixel electrodes in the display area, and an upper insulating layer disposed on the lower insulating layer and having a greater area than an upper surface of the lower insulating layer.