Hole Injection Layer Conductivity Patterning for Pixel Leakage Control
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Solution Overview
Problem
The manufacture of display devices with a dividing area where a hole transport layer and a hole injection layer are not formed is complicated and time-consuming.
Innovation Solution
A display device manufacturing method where the hole injection layer is treated with a treatment liquid to alter its electrical conductivity, forming a common layer with distinct conductivity portions for the light-emitting elements, simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dividing area where hole transport layer and hole injection layer are not formed is provided between pixels, then current leakage between pixels is suppressed, but the manufacture becomes complicated and time-consuming
Solution Approach 1:
The patent applies local quality by creating a dividing area with different electrical conductivity properties. Specifically, the hole injection layer in the dividing area is treated to have lower electrical conductivity compared to the light-emitting regions, allowing the same layer structure to serve dual purposes: current injection in light-emitting areas and current blocking in dividing areas.
Solution Approach 2:
The patent changes the electrical conductivity parameter of the hole injection layer in the dividing area through treatment with specific solutions or plasma processing. This parameter change allows the hole injection layer to function as both a current injection layer in light-emitting regions and a current blocking layer in dividing areas, eliminating the need for separate structural layers.
2Reliability
If a dividing area where hole transport layer and hole injection layer are not formed is provided between pixels, then current leakage between pixels is suppressed, but manufacturing time increases
Solution Approach 1:
The patent merges the functions of current injection and current blocking into a single hole injection layer by applying local treatment. This eliminates the need for separate dividing area structures, reducing the number of manufacturing steps while maintaining current leakage suppression functionality.
Solution Approach 2:
The hole injection layer serves multiple functions: it acts as a current injection layer in light-emitting regions and as a current blocking layer in dividing areas. This multi-functionality reduces the overall device complexity and manufacturing time while maintaining reliability.
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
Facilitates the manufacture of display devices by reducing process complexity and suppressing current leakage and color mixing between adjacent light-emitting elements, thereby enhancing display performance and reducing power consumption.
Implementation Method 1
treating the hole injection layer with a treatment liquid to change electrical conductivity of at least a portion of the hole injection layer
Data Source
AI summary
A display device manufacturing method of manufacturing a display device including a plurality of light-emitting elements in each of which an anode, a hole injection layer, a light-emitting layer, and a cathode are layered in this order, the hole injection layer being provided in common in the plurality of light-emitting elements, and the method including treating the hole injection layer with a treatment liquid to change conductivity of at least a portion of the hole injection layer.