Pixel Connecting Electrodes for Non-Overlapping Light-Emitting Elements
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Solution Overview
Problem
Existing display devices face challenges in arranging light-emitting elements without regard to the layout of pixel electrodes on a semiconductor circuit board, limiting the flexibility and efficiency of light-emitting element connections.
Innovation Solution
A display device design featuring first and second pixel circuit units with non-overlapping light-emitting elements, connected via pixel connecting electrodes that allow for proper connection even if the light-emitting elements do not overlap with the pixel electrodes, along with a method of fabricating this device involving the formation of insulating films, contact holes, and connecting electrodes to facilitate bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light-emitting elements are arranged to overlap with pixel electrodes for direct connection, then connection reliability is improved, but layout flexibility and adaptability deteriorate
Solution Approach 1:
The patent introduces pixel connecting electrodes as intermediary elements between the pixel electrodes and light-emitting elements. These connecting electrodes extend from the pixel electrodes through insulating films to reach and connect with the light-emitting elements, enabling reliable electrical connection even when the light-emitting elements do not directly overlap with the pixel electrodes. This mediator structure resolves the contradiction by maintaining connection reliability while allowing layout flexibility.
Solution Approach 2:
The patent utilizes the third dimension (vertical stacking) by extending connecting electrodes through multiple insulating film layers to connect pixel electrodes with light-emitting elements that are positioned at different vertical levels. This dimensional approach allows the light-emitting elements to be arranged in locations that would not be accessible through planar connections alone, thereby improving both connection reliability and layout flexibility simultaneously.
2Adaptability or versatility
If pixel connecting electrodes are extended to connect non-overlapping light-emitting elements, then layout flexibility is improved, but electrode length and manufacturing complexity increase
Solution Approach 1:
The pixel connecting electrodes are segmented into multiple portions: a first pixel connecting electrode portion extending from the pixel electrode through the first insulating film, and a second pixel connecting electrode portion extending through the second insulating film. This segmentation allows each portion to be optimized independently for its specific function and manufacturing process, reducing overall complexity while maintaining layout flexibility.
Solution Approach 2:
The pixel connecting electrodes serve multiple functions: they provide electrical connection between pixel electrodes and light-emitting elements, act as bonding structures during wafer bonding processes, and enable flexible layout arrangements. By designing a single multi-functional electrode structure, the patent reduces the need for separate specialized components, thereby simplifying the overall device complexity while maintaining adaptability.
Data Source
AI summary
A display device and a method of fabricating the same is provided. A display device includes first and second pixel circuit units spaced apart from each other, a first pixel electrode on the first pixel circuit unit, a second pixel electrode on the second pixel circuit unit, a first light-emitting element electrically connected to the first pixel electrode, and for emitting first light, a second light-emitting element electrically connected to the second pixel electrode, and for emitting second light, a first pixel connecting electrode between the first pixel electrode and the first light-emitting element, and a second pixel connecting electrode between the second pixel electrode and the second light-emitting element, wherein the first pixel electrode overlaps with the first light-emitting element, and wherein the second pixel electrode does not overlap with the second light-emitting element.