OLED Driving Sub-pixels Overlapping Color Pixels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Top emission type organic light emitting display devices face challenges in achieving high color reproducibility and resolution due to limitations in aperture ratio and non-uniformity caused by dead zones between organic thin film patterns, as well as restricted design freedom for driving elements in sub-pixels.
Innovation Solution
The design includes a substrate with sub-pixels arranged in specific orientations and driving elements overlapping multiple sub-pixels, with a 3×2 matrix configuration for driving sub-pixels, allowing for improved integration and design freedom, and a light emitting diode connected to driving elements, enhancing the organic emitting layer's efficiency and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If organic thin film patterns are spaced apart by gaps to prevent shadowing effect, then shadowing effect is reduced, but aperture ratio decreases and dead zones increase
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of sub-pixels to a three-dimensional stacked configuration where driving elements are positioned vertically above sub-pixels. This dimensional change allows driving elements to overlap with multiple sub-pixels in the vertical direction, eliminating the need for lateral gaps while maintaining electrical connectivity and reducing dead zones.
Solution Approach 2:
The patent implements a nested structure where driving elements are positioned within the vertical projection area of multiple sub-pixels. The driving elements are embedded in insulating layers that are stacked above the sub-pixels, creating a nested configuration where the driving circuitry is contained within the footprint of the display area, thereby eliminating lateral gaps between organic thin film patterns.
2Device complexity
If driving elements are integrated within sub-pixel regions, then device complexity is reduced, but design freedom is restricted
Solution Approach 1:
By moving driving elements to a vertical stacking configuration above sub-pixels, the patent frees up lateral design space within sub-pixel regions. This dimensional relocation allows driving elements to be positioned without constraining the lateral arrangement of organic thin film patterns, thereby maintaining design freedom while achieving integration.
Solution Approach 2:
The patent segments the device into distinct functional layers: sub-pixel emission layers at the bottom and driving element layers stacked above. This segmentation allows independent optimization of each layer - sub-pixels can be arranged for optimal light emission while driving elements are positioned for optimal electrical connectivity, enhancing both integration and design freedom.
3Area of stationary object
If top emission type configuration is used to improve aperture ratio, then aperture ratio increases, but color reproducibility and resolution are compromised due to dead zones
Solution Approach 1:
The patent introduces insulating layers as intermediary structures between sub-pixels and driving elements. These insulating layers serve as mediators that allow driving elements to be positioned vertically above sub-pixels without direct contact, enabling the elimination of lateral gaps while maintaining electrical isolation. This intermediary structure facilitates high aperture ratio without compromising color reproducibility.
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 configuration enhances color reproducibility and resolution by optimizing the spacing and arrangement of sub-pixels and driving elements, reducing dead zones and non-uniformity, and allowing for more flexible integration of driving circuits, thereby improving the overall performance of the top emission type OLED device.
Implementation Method 1
an electron of a first electrode and a hole of a second electrode are injected into an emission portion and a light is emitted when an exciton generated by the combination of the electron and the hole transitions from an excited state to a ground state
Data Source
AI summary
An organic light emitting display device can include a plurality of color sub-pixels including first, second and third color sub-pixels, the first and second color sub-pixels disposed along a first direction, and the third color sub-pixel disposed adjacent to the first and second color sub-pixels along a second direction different from the first direction; and a plurality of driving sub-pixels configured to drive light emitting diodes of the color sub-pixels. Also, each of the driving sub-pixels can include a driving transistor and a switching unit, and each and every one of the driving sub-pixels overlapping with at least two color sub-pixels among the plurality of color sub-pixels. In addition, the first, second and third color sub-pixels correspond to a portion of four of the driving sub-pixels, and one of the driving sub-pixels overlaps with three or four corresponding color sub-pixels among the plurality of color sub-pixels.