OLED Hole Injection Layer Layout to Block Pixel Crosstalk
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Solution Overview
Problem
The formation of an organic compound material layer excluding the light-emitting layer as a common layer between anode and cathode electrodes in multiple pixels leads to optical crosstalk, deteriorating display quality due to carrier transport between adjacent pixels.
Innovation Solution
A display device with light-emitting elements having different luminescent colors, where the first carrier injection layer is common to all pixels and includes a carrier injection section and a neighboring pixel blocking section to prevent carrier transport between adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an organic compound material layer excluding the light-emitting layer is formed as a common layer between anode and cathode electrodes in multiple pixels, then the number of manufacturing steps is reduced and manufacturing cost is reduced, but optical crosstalk occurs due to carrier transport between adjacent pixels
Solution Approach 1:
The common layer is segmented into a carrier injection section positioned over the light-emitting layer and a neighboring pixel carrier blocking section positioned between adjacent pixels. This segmentation allows the layer to simultaneously provide carrier injection functionality while blocking carrier transport to adjacent pixels, thereby preventing optical crosstalk while maintaining manufacturing efficiency.
Solution Approach 2:
Different regions of the common layer are assigned different functions: the carrier injection section has properties that facilitate carrier injection into the light-emitting layer, while the neighboring pixel carrier blocking section has properties that prevent carrier transport to adjacent pixels. This local differentiation of functional properties resolves the contradiction between providing common carrier injection and preventing optical crosstalk.
2Ease of manufacture
If an organic compound material layer excluding the light-emitting layer is formed as a common layer between anode and cathode electrodes, then manufacturing cost is reduced, but display quality deteriorates due to optical crosstalk
Solution Approach 1:
The common layer is divided into functional sections that simultaneously achieve cost reduction through commonality and display quality through localized carrier blocking. The segmentation enables a single manufacturing process to produce both the carrier injection region and the carrier blocking region, maintaining cost efficiency while preventing optical crosstalk that would degrade display quality.
Solution Approach 2:
The common layer exhibits different local properties: in the carrier injection section it facilitates carrier injection, while in the neighboring pixel regions it blocks carrier transport. This local quality differentiation ensures high display quality by preventing optical crosstalk while maintaining the cost benefits of a common layer structure.
3Device complexity
If a common layer is formed to be common to multiple pixels for carrier transport, then the structure is simplified, but carriers are transported to adjacent pixels causing optical crosstalk
Solution Approach 1:
The common layer is segmented into a carrier injection section and a neighboring pixel carrier blocking section within a single continuous layer structure. This segmentation maintains structural simplicity and manufacturing ease while the blocking section prevents carrier transport to adjacent pixels, thereby eliminating optical crosstalk without increasing device complexity.
Solution Approach 2:
Different regions of the common layer are given different functional qualities: the carrier injection section allows carrier transport to the light-emitting layer, while the neighboring pixel sections block carrier transport to adjacent pixels. This local quality differentiation resolves the contradiction between structural simplicity and prevention of optical crosstalk.
Data Source
AI summary
A display device includes a hole injection layer common to a plurality of light-emitting elements between a light-emitting layer and an anode electrode under the light-emitting layer in the light-emitting element of each pixel. The hole injection layer includes a hole injection section configured to transport positive holes to the light-emitting layer, and a neighboring pixel hole blocking section formed in a portion between the light-emitting elements of adjacent pixels and configured to block transportation of positive holes between the light-emitting elements of the adjacent pixels.