Display Pixel Structure With Side Contact Layer for Electron Injection
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Solution Overview
Problem
Display devices face inefficiencies in light emission due to electron traps caused by defects in the sidewalls of light emitting elements, which hinder the effective provision of electrons to the active layer.
Innovation Solution
A display device structure is developed, including a pixel circuit layer, light emitting elements, and specific organic and electrode layers, where a contact layer with reflective material extends along the side surfaces of the light emitting elements to facilitate electron injection by contacting a light transmissive second electrode, thereby preventing electron traps and enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional structure without side-contact is used, then the device structure is simpler, but electron trapping occurs due to defects in the sidewall of light emitting elements
Solution Approach 1:
The contact layer acts as an intermediary component between the second electrode and the light emitting elements. It extends along the side surface to provide an additional electron supply path, mediating the electron transport and preventing electron trapping caused by sidewall defects in the light emitting elements.
Solution Approach 2:
The patent transitions from a conventional top-only electrode contact to a three-dimensional contact structure. The contact layer extends along the side surface of the light emitting elements, adding a vertical/d lateral dimension to the electron supply path, thereby creating multiple electron injection channels.
2Productivity
If the contact layer extends to contact the second electrode, then electron supply to the active layer is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The contact layer is formed in advance during the manufacturing process, extending along the side surface before the final electrode assembly is completed. This preliminary formation of the contact structure facilitates subsequent electron transport and simplifies the overall device assembly by pre-establishing the electron supply pathway.
3Reliability
If the contact layer includes reflective material, then electron transport is enhanced, but light emission may be affected
Solution Approach 1:
The contact layer is positioned specifically along the side surface of the light emitting elements, where it provides reflective properties to enhance electron transport. This localized placement ensures that the reflective function is applied only where needed for electron transport, while minimizing potential interference with the overall light emission from the active layer.
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 configuration effectively prevents electron trapping and improves light emission efficiency by ensuring efficient electron supply to the active layer, thereby enhancing the overall performance of the display device.
Implementation Method 1
a contact layer with reflective material extends along the side surfaces of the light emitting elements to facilitate electron injection
Data Source
AI summary
A display device includes a pixel circuit layer including a base layer and a pixel circuit, a first electrode disposed on the pixel circuit layer, light emitting elements disposed on the first electrode, a second electrode disposed on the light emitting elements, a first organic layer disposed between the light emitting elements, a second organic layer disposed between the light emitting elements and spaced apart from the light emitting elements, and a contact layer disposed between the first organic layer and the second organic layer and contacting a side surface of the light emitting elements.