Display Panel Positioning Areas for Accurate OLED Inkjet Printing
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Solution Overview
Problem
The high reflectivity of metal anodes in organic light-emitting diode display panels and small pixel intervals lead to inaccuracies in determining the relative positions of print head modules and pixels, resulting in printing defects and reduced product yield during inkjet printing.
Innovation Solution
Incorporating auxiliary areas with positioning and non-positioning sub-areas outside the display area, where the positioning sub-areas have light transmittance opposite to the non-positioning areas, to facilitate accurate location determination of display subpixels and prevent printing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If inkjet printing technology is used without fine metal masks, then manufacturing complexity is reduced, but positioning accuracy between print head modules and pixels deteriorates
Solution Approach 1:
The patent introduces auxiliary areas with positioning sub-areas as intermediary structures between the print head modules and the display subpixels. These positioning sub-areas serve as reference markers that facilitate accurate positioning during inkjet printing without requiring fine metal masks, thus resolving the contradiction between reduced manufacturing complexity and maintained positioning accuracy.
Solution Approach 2:
The auxiliary areas with positioning sub-areas are formed in advance on the substrate before the inkjet printing process. This preliminary action establishes reference markers that guide the print head modules, enabling accurate positioning to be achieved without the need for complex fine metal masks during the actual printing process.
2Reliability
If metal anodes with high reflectivity are used, then electrical performance is improved, but positioning accuracy of pixels deteriorates
Solution Approach 1:
The positioning sub-areas in the auxiliary areas serve as intermediary reference structures that are distinct from the metal anodes. These positioning sub-areas provide optical contrast that enables accurate positioning without being affected by the high reflectivity of the metal anode materials, thus maintaining both electrical performance and positioning accuracy.
Solution Approach 2:
The patent applies local quality by creating positioning sub-areas with specific optical properties (different transmittance or reflectivity) in the auxiliary areas, while the display areas maintain their metal anode structure for electrical performance. This localized differentiation allows positioning functions and electrical functions to coexist without interfering with each other.
3Manufacturing precision
If pixel intervals are reduced to increase resolution, then display quality is improved, but positioning accuracy deteriorates
Solution Approach 1:
The patent introduces auxiliary areas as an additional dimensional element outside the display area. These auxiliary areas provide positioning reference structures that are separate from the tightly packed display subpixels, enabling accurate positioning to be achieved in a different spatial dimension without being constrained by the reduced pixel intervals in the display area.
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
The use of auxiliary areas allows for precise location determination of display subpixels, thereby preventing printing defects and improving product yield by ensuring accurate alignment during the printing process.
Implementation Method 1
the positioning sub-area has light transmittance opposite to that of the non-positioning area
Data Source
AI summary
A display panel, a display screen, and an electronic device are disclosed. The display panel includes a plurality of auxiliary areas at least provided on adjoining two sides outside a display area. The auxiliary areas each include a positioning sub-area and a non-positioning sub-area. The positioning sub-area includes a geometric center, and the positioning sub-area has light transmittance opposite to that of a corresponding non-positioning area.