OLED Display Conductive Layer Cross Portions for Color Shift
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As resolution increases in organic light-emitting display apparatus, the overlap of OLEDs, transistors, capacitors, and signal wires leads to various issues such as characteristic differences between pixels and asymmetric color shift phenomena, affecting visibility.
Innovation Solution
The organic light-emitting display apparatus is designed with a conductive layer having extension portions that cross each other, forming cross portions which overlap the emission regions of pixels, and a pixel-defining film that exposes portions of the pixel electrode to define emission regions, ensuring uniform voltage distribution and symmetry across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resolution is increased by arranging OLEDs, transistors, capacitors, and wires in overlapping configurations, then pixel density and display resolution are improved, but characteristic differences between pixels and asymmetric color shift phenomena occur, degrading visibility
Solution Approach 1:
The patent applies asymmetry by intentionally designing the conductive layer pattern to be asymmetric relative to the pixel structure. Specifically, the conductive layer is positioned to overlap only one of the two transistor gates (either the switching transistor gate or the driving transistor gate) while avoiding overlap with the other gate. This asymmetric configuration compensates for the inherent asymmetries in pixel characteristics and reduces color shift phenomena, thereby improving pixel uniformity while maintaining high display resolution.
2Measurement precision
If more pixels are arranged to achieve high resolution, then display detail is improved, but device complexity and manufacturing difficulty increase due to overlapping components
Solution Approach 1:
The patent utilizes the vertical dimension (z-axis) to resolve component overlap issues. By positioning the conductive layer in a different vertical plane between the substrate and the pixel electrode, the design allows horizontal arrangement of multiple pixels at high density while avoiding electrical interference through vertical separation. This dimensional approach enables high pixel density without proportionally increasing manufacturing complexity.
Data Source
AI summary
An organic light-emitting display apparatus in which a plurality of pixels are arranged in a first direction and a second direction crossing the first direction includes: an organic light-emitting device disposed on a substrate, wherein the organic light-emitting device is included in each of the plurality of pixels; a pixel-defining film covering edges of a pixel electrode of the organic light-emitting device and having an opening exposing a portion of the pixel electrode to define an emission region; and a conductive layer between the substrate and the organic light-emitting device. The conductive layer includes first extension portions extending in the first direction and second extension portions extending in the second direction. The emission region of each of the plurality of pixels overlaps one of cross portions where the first extension portions and the second extension portions cross each other.