Sub-Pixel Electrode Layout for Precise LED Alignment in Displays
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Solution Overview
Problem
Existing display devices face challenges in minimizing misalignment of subminiature light emitting diodes, which affects light output efficiency.
Innovation Solution
A display device design where light emitting elements are precisely aligned between electrodes using an electric field, ensuring they are only disposed in a target area to enhance optical efficiency, with a method of fabricating the device that includes forming electrodes and insulating layers to prevent short-circuiting and improve alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are disposed in a large area, then alignment flexibility is improved, but light output efficiency deteriorates due to misalignment
Solution Approach 1:
The patent applies local quality by creating a specific target area with distinct properties (different from surrounding areas) where light emitting elements are intended to be disposed. This target area has specific characteristics that guide precise alignment and disposal of light emitting elements, ensuring they are placed only where needed to maximize light output efficiency and prevent misalignment losses.
2Area of stationary object
If electrode area is reduced, then space utilization is improved, but connection reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining target areas on electrodes before light emitting elements are disposed. These target areas serve as predetermined zones that guide the placement of light emitting elements, ensuring reliable connections are established in advance through proper alignment and positioning, thereby maintaining connection reliability even with reduced overall electrode area.
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 enhances light output efficiency by ensuring light emitting elements are accurately aligned and operated within their designated area, reducing misalignment and increasing the lifespan of the display device.
Implementation Method 1
A first and a second electrode may be provided in an emission area of each sub-pixel, and an electric field may be generated between the first and second electrodes to align light emitting elements in the emission area of each sub-pixel
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A display device may include: a substrate including a display area and a non-display area; and pixels provided on the display area, and each including sub-pixels each including an emission area and a non-emission area. Each of the sub-pixels may include a display element layer including at least one light emitting element that emits light. The display element layer may include: a first electrode and a second electrode spaced apart from each other, the light emitting element disposed therebetween; and connection lines including a first connection line extending in a row direction of the substrate and connected to the first electrode, and a second connection line extending parallel to the first connection line and connected to the second electrode. Two connection lines having a symmetric structure may be disposed in an area between two sub-pixels adjacent to each other in a column direction of the substrate.