OLED Barrier Layer Blocks Charge Leakage Between Adjacent Anodes
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Solution Overview
Problem
High-resolution OLED displays face challenges due to light leakage caused by charge sharing between adjacent sub-pixels, leading to uneven light emission and reduced display effectiveness, especially at low currents.
Innovation Solution
Incorporating a barrier layer on the pixel definition layer between adjacent anodes to block electrical charges from entering into the cathode layer of neighboring sub-pixels, preventing charge leakage and enhancing display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between light emitting units is decreased to increase resolution, then the display resolution is improved, but light leakage occurs between adjacent sub-pixels
Solution Approach 1:
The patent introduces a barrier layer that segments the common layer into isolated regions for each sub-pixel. This segmentation prevents charge carriers from migrating between adjacent sub-pixels, thereby eliminating light leakage while maintaining high resolution displays with closely spaced light emitting units.
Solution Approach 2:
The barrier layer acts as an intermediary structure between adjacent sub-pixels. It physically blocks the migration path of charge carriers through the common layer, preventing unwanted charge sharing and light leakage between neighboring sub-pixels while allowing each sub-pixel to function independently.
2Adaptability or versatility
If different light emitting materials are used for R, G, and B colors with different turn-on voltages, then color display capability is improved, but charge leakage between sub-pixels occurs due to voltage differences
Solution Approach 1:
The barrier layer segments the common layer into electrically isolated regions for each sub-pixel. This segmentation ensures that charge carriers generated in one sub-pixel cannot migrate to adjacent sub-pixels with different turn-on voltages, preventing light leakage while preserving the ability to display different colors with their respective voltage requirements.
Solution Approach 2:
The barrier layer serves as an intermediary that blocks charge carrier migration between sub-pixels with different turn-on voltages. It prevents charge leakage caused by voltage differences between R, G, and B sub-pixels while allowing each sub-pixel to operate at its optimal voltage for color emission.
3Use of energy by moving object
If low current is used to emit light from a sub-pixel, then energy consumption is reduced, but light leakage from adjacent sub-pixels becomes more noticeable
Solution Approach 1:
The barrier layer segments the common layer into isolated regions, preventing charge carrier migration between sub-pixels. This segmentation ensures that when one sub-pixel operates at low current to reduce energy consumption, adjacent sub-pixels cannot receive leaked charges and emit unwanted light, thereby maintaining display quality at low power levels.
Solution Approach 2:
The barrier layer acts as an intermediary that blocks charge leakage paths between sub-pixels. When a sub-pixel operates at low current, the barrier layer prevents charges from migrating to adjacent sub-pixels, ensuring that energy-saving low current operation does not result in visible light leakage from neighboring pixels.
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 barrier layer effectively prevents charge leakage, improving the display effect of OLED panels by ensuring accurate and uniform light emission across sub-pixels, even at varying current levels.
Implementation Method 1
a barrier layer 206 disposed on the pixel definition layer 202 between any two of the anodes 207, 208 adjacent to each other. The barrier layer 206 is configured to block an electrical charge released by one of the two adjacent anodes 207, 208 from entering into a light emitting unit in a cathode layer 205 corresponding to the other of the two adjacent anodes
Data Source
AI summary
An organic light emitting diode (OLED) display panel and a method for manufacturing the OLED display panel are provided. The OLED display panel includes a thin film transistor layer, an anode layer, a pixel definition layer, a cathode layer, and a barrier layer. The barrier layer is disposed on the pixel definition layer between any two adjacent anodes. The barrier layer blocks an electrical charge released by one of the two adjacent anodes from entering into a region in the cathode layer corresponding to the other of the two adjacent anodes.