Display Pixel Bank-Electrode Layout With Single-Mask Light Guiding
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Solution Overview
Problem
Current display devices face challenges in increasing light emission efficiency and reducing manufacturing costs, particularly due to the complexity and cost associated with the number of masks required in the manufacturing process.
Innovation Solution
A display device design that includes a plurality of pixels with a first bank and electrodes made of conductive polymer, which also includes scattering materials, to guide light emission efficiently and reduce the number of masks needed by simultaneously forming these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple separate masks are used to form the first bank and electrodes, then the manufacturing precision and component separation are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the formation of the first bank and first/second electrodes into a single mask patterning step. The mask pattern includes openings that simultaneously define the light emission regions (first bank) and the electrode positions, eliminating the need for separate masking processes and reducing overall device complexity while maintaining manufacturing precision.
Solution Approach 2:
The single mask serves multiple functions: it defines the light emission regions for the first bank, positions the first electrode, and positions the second electrode. This multi-functional approach reduces the number of masking steps required while ensuring precise alignment and separation of all components.
2Reliability
If conventional materials are used for electrodes and banks, then the electrical conductivity is sufficient, but the light emission efficiency and light guiding capability are reduced
Solution Approach 1:
The patent employs composite materials for the first bank and electrodes that combine conductive properties with light-guiding capabilities. The material composition is designed to maintain sufficient electrical conductivity for electrode function while incorporating optical properties that enhance light emission efficiency and direct light toward the front surface of the display device.
Solution Approach 2:
The material properties are optimized locally: the composite material provides different functional characteristics in different regions or aspects. The material maintains electrical conductivity where needed for current flow while providing enhanced light guiding and emission properties in regions where light interaction occurs, achieving both electrical reliability and optical efficiency.
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 approach enhances light emission efficiency by directing light towards the front surface and simplifies the manufacturing process by reducing the number of masks, thereby lowering costs.
Implementation Method 1
The first bank, the first electrode, and the second electrode may include a scattering material dispersed in the conductive polymer
Data Source
AI summary
A display device includes a plurality of pixels, a first bank defining light emission regions of the plurality of pixels, a first electrode and a second electrode which are spaced apart from each other in each of the light emission regions, and a plurality of light emitting elements disposed between the first electrode and the second electrode. The first bank, the first electrode, and the second electrode include a same material.