Pixel Electrode Layout With Selective Etching for Stable LED Connection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in reliably connecting light emitting elements between electrodes, leading to inefficiencies in light emission characteristics and utilization rates.
Innovation Solution
A display device design that includes a first and second electrode with insulating layers of different etch selectivities, allowing for precise alignment and connection of light emitting elements through third and fourth electrodes, enhancing the reliability of electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting elements are connected between electrodes in existing display devices, then light emission function is achieved, but connection reliability is poor leading to unstable emission characteristics
Solution Approach 1:
The insulating layer is divided into multiple regions with different etch selectivities: a first region with first etch selectivity and a second region with second etch selectivity. This segmentation allows different portions of the insulating layer to be selectively removed to expose different areas, enabling precise alignment and reliable connection of light emitting elements to electrodes while maintaining stable emission characteristics.
Solution Approach 2:
Different regions of the insulating layer are assigned different etch selectivities tailored to their specific functions. The first region has etch selectivity optimized for exposing electrode connection areas, while the second region has etch selectivity optimized for other structural requirements. This local differentiation enables precise control over the connection process and improves overall connection reliability.
2Manufacturing precision
If insulating layers with single etch selectivity are used, then manufacturing process is simple, but precise alignment and connection of light emitting elements cannot be achieved
Solution Approach 1:
The insulating layer is segmented into regions with different etch selectivities, where each region can be selectively etched to reveal underlying structures at precise locations. This enables accurate alignment of light emitting elements with electrodes by controlling which regions are exposed during the etching process.
Solution Approach 2:
The etch selectivity parameter of the insulating layer is varied across different regions to achieve precise alignment. By changing the etch selectivity parameter locally, the patent enables selective exposure of electrode areas and precise positioning of light emitting elements without requiring complex alignment mechanisms.
3Productivity
If light emitting elements are densely packed to improve utilization rate, then pixel density increases, but connection reliability decreases
Solution Approach 1:
The insulating layer is segmented into multiple regions with different etch selectivities, enabling precise control over connection formation even when light emitting elements are densely packed. This segmentation allows each element to be accurately aligned and connected to electrodes despite reduced spacing between elements.
Solution Approach 2:
Different regions of the insulating layer have locally optimized etch selectivities that facilitate reliable connection formation in high-density configurations. The local quality variation ensures that connection areas are precisely exposed while maintaining appropriate spacing and alignment for densely packed light emitting elements.
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
The solution stabilizes emission characteristics and enhances the utilization rate of light emitting elements in each pixel, improving the overall performance of the display device.
Implementation Method 1
a liquid crystal display device comprises a liquid crystal which changes its molecular arrangement in response to an applied voltage
Data Source
Figure 1A~2B
Figure 3A~3B
Figure 4A~4B
AI summary
A pixel according to an embodiment of the present disclosure includes: a first electrode and a second electrode spaced apart from each other; a first insulating layer having a first etch selectivity; a first insulating pattern having a second etch selectivity; a light emitting element including a first end and a second end; a second insulating pattern disposed on one area of the light emitting element to expose the first end and the second end of the light emitting element, and having the second etch selectivity; and a third electrode and a fourth electrode electrically connecting the first end and the second end of the light emitting element to the first electrode and the second electrode, respectively.