Pixel Electrode Contact-Hole Layout for Reliable Display Pixels
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Solution Overview
Problem
Existing display devices face challenges in enhancing reliability and efficiency in pixel design, particularly in the electrical connections and structural integrity of electrodes and pixel electrodes.
Innovation Solution
A display device design featuring a first and second lower electrode with corresponding upper electrodes, each connected through contact holes in insulating layers, allowing direct electrical connections between pixel electrodes and upper electrodes, with transparent and opaque conductive materials used for electrodes and pixel electrodes, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple electrodes and insulating layers are added to improve electrical connections and light emission, then reliability and efficiency are enhanced, but device complexity increases
Solution Approach 1:
The pixel structure is segmented into multiple functional layers including lower electrodes, upper electrodes, and insulating layers with contact holes. Each layer performs a specific function: lower electrodes provide electrical connection to pixel circuits, insulating layers with contact holes enable selective electrical connection, and upper electrodes provide electrical connection to light emitting elements. This segmentation allows reliable electrical connections while maintaining clear functional separation.
Solution Approach 2:
The patent utilizes vertical stacking of electrodes and insulating layers to achieve reliable electrical connections in the thickness direction. By arranging lower electrodes, insulating layers with contact holes, and upper electrodes in a stacked configuration, the patent enables three-dimensional electrical connection paths that improve reliability without increasing planar complexity.
2Illumination intensity
If transparent conductive materials are used for lower electrodes to improve light transmission, then light emission efficiency is enhanced, but electrical conductivity may be reduced compared to opaque conductors
Solution Approach 1:
The patent employs transparent conductive materials for lower electrodes that combine optical transparency with electrical conductivity. The lower electrode is designed as a composite structure that integrates both light transmission capability and sufficient electrical conductivity to reliably connect pixel circuits with light emitting elements, resolving the trade-off between optical and electrical performance.
3Reliability
If contact holes are created in insulating layers to expose lower electrodes, then electrical connection is improved, but manufacturing precision requirements increase
Solution Approach 1:
The insulating layers are formed with contact holes positioned to expose specific portions of lower electrodes before the upper electrodes are formed. This preliminary creation of electrical connection paths through contact holes ensures that subsequent layers can be accurately aligned to these pre-defined connection points, reducing the overall manufacturing precision requirements.
Solution Approach 2:
The insulating layers are designed with localized contact holes at specific positions where electrical connection is required, while maintaining insulation in other areas. This local quality approach allows electrical connection only where needed, simplifying the overall manufacturing process by reducing the number of alignment-critical features across the entire pixel structure.
Data Source
AI summary
A display device may include pixels, each of the pixels including first and second lower electrodes disposed on a substrate; first and second upper electrodes respectively disposed on the first and second lower electrodes; a first insulating layer including a first contact hole exposing a portion of the first lower electrode, and a second contact hole exposing a portion of the second lower electrode; a first pixel electrode disposed on the first insulating layer, and contacting the first lower electrode through the first contact hole; a second pixel electrode disposed on the first insulating layer, and contacting the second lower electrode through the second contact hole; and a light emitting element disposed between the first and second upper electrodes. The first and second pixel electrodes may be respectively and electrically connected with the first and second upper electrodes.