Pixel Electrode Protrusion Layout to Prevent Display Color Mixing
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Solution Overview
Problem
Existing display devices face issues with misalignment of light-emitting elements and color mixing, leading to defects and reduced image quality.
Innovation Solution
The display device incorporates pixel electrodes with protrusions aligned with light-emitting elements, a planarization layer, and a common electrode, along with a reflective metal layer to prevent misalignment and color mixing, using a manufacturing method that includes laser irradiation and photoresist patterning to form precise pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting elements are arranged on pixel electrodes without protrusions, then the device structure is simpler, but misalignment of light-emitting elements occurs leading to color mixing
Solution Approach 1:
The pixel electrode is segmented into a first pixel electrode and a second pixel electrode that are disposed adjacent to each other. The first pixel electrode includes a protrusion that extends toward the second pixel electrode, creating distinct alignment zones. This segmentation allows the light-emitting element to be precisely positioned on the protrusion, preventing misalignment and color mixing while maintaining a relatively simple overall structure.
Solution Approach 2:
The protrusion is formed in advance on the first pixel electrode before the light-emitting element is disposed. This preliminary structural feature serves as a pre-established alignment guide that ensures the light-emitting element is correctly positioned during the manufacturing process, thereby preventing misalignment and color mixing issues.
2Area of stationary object
If adjacent pixel electrodes are positioned close together, then the display area is increased, but color mixing between adjacent pixels occurs
Solution Approach 1:
The pixel electrode is segmented into a first pixel electrode and a second pixel electrode that are disposed adjacent to each other. The first pixel electrode includes a protrusion that extends toward the second pixel electrode, creating distinct alignment zones. This segmentation allows the light-emitting element to be precisely positioned on the protrusion, preventing misalignment and color mixing while maintaining a relatively simple structure.
Solution Approach 2:
The protrusion creates a localized region with distinct geometric characteristics that serves as an alignment reference. This local structural feature ensures that the light-emitting element is correctly positioned only in the specific area where it should emit light, preventing light from spilling into adjacent pixel regions and causing color mixing.
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
This design prevents misalignment of light-emitting elements, reduces step defects, and prevents color mixing, enabling high-quality image display with controlled light-emitting element density and adaptability to various pixel sizes.
Implementation Method 1
a wavelength conversion layer disposed between the banks and overlapping each of the light-emitting areas in a plan view
Data Source
AI summary
A display device includes pixel electrodes disposed on a substrate, at least one light-emitting element disposed on each of the pixel electrodes, a planarization layer disposed on the pixel electrodes and filling a space between the at least one light-emitting element, and a common electrode disposed on the planarization layer and the at least one light-emitting element. Each of the light-emitting elements is arranged perpendicular to a top face of each of the pixel electrodes, at least one of the pixel electrodes includes a protrusion protruding toward an adjacent one of the pixel electrodes, and the protrusion overlaps the light-emitting element in a plan view.