Display Pixel Bank Structure for Accurate LED Transfer Positioning
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Solution Overview
Problem
During the transfer process of light emitting devices in display devices, errors occur due to incorrect positioning, which affects the performance and reliability of the display.
Innovation Solution
The display device includes a substrate with a display area and non-display area, featuring a pixel driving circuit, banks, passivation layers, and a black matrix to support and position light emitting devices accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting devices are transferred during manufacturing, then the display device can be assembled, but positioning errors occur during the transfer process
Solution Approach 1:
The patent introduces a bank structure as an intermediary component during the transfer process. The bank serves as a temporary holding structure that receives light emitting devices during transfer and then transfers them to the final pixel electrode position. This intermediary structure enables the transfer process while maintaining positioning accuracy, resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
The bank structure is formed in advance on the substrate before the light emitting devices are transferred. This preliminary action creates a designated receiving structure that guides and positions the light emitting devices during transfer, ensuring accurate positioning from the outset rather than attempting to position devices directly at their final location.
2Manufacturing precision
If multiple layers are added to improve positioning accuracy, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The bank structure serves multiple functions: it acts as a receiving structure during transfer, provides positioning guidance, and serves as a support structure. By making the bank multi-functional, the patent achieves high positioning accuracy without adding numerous separate components, thus improving manufacturing precision while limiting the increase in device complexity.
Solution Approach 2:
The patent combines the positioning function and support function into a single bank structure. Rather than adding separate positioning elements and support elements, the bank integrates both functions, reducing the overall number of components while maintaining positioning accuracy.
Data Source
AI summary
A display device is provided with a substrate, a display area and a non-display area, a pixel driving circuit in a display area on the substrate, a bank on the pixel driving circuit, a first passivation layer on the bank, a light emitting device disposed on the bank and overlapping the bank, a first optical layer surrounding the light emitting device, a second passivation layer on the first optical layer, and a black matrix on the second passivation layer.