Light Emitting Display Device Anode Separation via Ramp Structures
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Solution Overview
Problem
In high-resolution light emitting display devices, the proximity of adjacent subpixels can lead to anode residual films causing short circuits and backlight bleed due to inadequate separation between anodes.
Innovation Solution
The implementation of a light emitting display device with a substrate featuring alternating first and second ramps on an organic insulating film, where the second ramps have a bumpy pattern, allowing for increased physical distance between anodes and facilitating their separation during the etching process, thereby preventing residual films and ensuring normal anode separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between anodes of adjacent subpixels is reduced to increase resolution, then the resolution is improved, but the anodes cannot be normally separated due to residual film and short circuit occurs
Solution Approach 1:
The organic insulating film is segmented into first ramps and second ramps that are alternately formed corresponding to subpixels. This segmentation creates physical separation structures between adjacent anodes, preventing residual film formation while maintaining high resolution display performance
Solution Approach 2:
The patent introduces a vertical dimension by forming ramps with inclined surfaces instead of maintaining a flat organic insulating film. The first ramps and second ramps create height differences that physically separate adjacent anodes in the vertical direction, solving the separation problem while keeping horizontal pitch small for high resolution
2Measurement precision
If the distance between anodes of adjacent subpixels is reduced to increase resolution, then the resolution is improved, but backlight bleed occurs due to turn-on of adjacent subpixel
Solution Approach 1:
The organic insulating film is divided into first ramps corresponding to emission areas and second ramps corresponding to non-emission areas. This segmentation creates physical barriers that prevent light from adjacent subpixels from bleeding into the current subpixel, while maintaining high resolution
Solution Approach 2:
The second ramps act as intermediary light-blocking structures between adjacent subpixels. These ramps prevent direct light transmission from neighboring emission areas, eliminating backlight bleed while allowing high-resolution pixel arrangement
3Reliability
If alternating first ramps and second ramps are formed on organic insulating film, then anode separation is improved and residual film is prevented, but device structure becomes more complex
Solution Approach 1:
The first ramps and second ramps are merged into a single organic insulating film structure, forming an integrated pattern that provides both emission and non-emission area definitions. This merging simplifies the overall device structure compared to using separate components for each function
Solution Approach 2:
The organic insulating film serves multiple functions simultaneously: it provides the base structure for anode formation, creates physical separation between adjacent anodes through ramp structures, defines emission and non-emission areas, and prevents residual film formation. This multi-functionality reduces the need for additional separate structures
Data Source
AI summary
A light emitting display device can be configured so that a ramp and a bumpy pattern are provided in a first direction in which a horizontal distance between subpixels is small. As a result, the physical distance between anodes of adjacent subpixels can be increased, a normal separation between the anodes of adjacent subpixels is possible, and a mixture of colors between the adjacent subpixels depending on a viewing angle can be prevented.