OLED Display Panel Leakage Barrier Control Line
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light-emitting display panels face lateral leakage current issues due to the high conductivity of the hole transport layer, leading to reduced signal voltage and blurred display images.
Innovation Solution
Incorporating a leakage barrier control line that generates a potential barrier within the carrier layer to hinder lateral carrier flow, using materials with specific work functions to form Schottky junctions or heterojunctions, and strategically placing leakage barrier control branches to reduce lateral diffusion between adjacent sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple organic layers are continuously evaporated onto the OLED panel without using shadow mask, then manufacturing complexity is reduced and productivity is improved, but lateral leakage current occurs through the hole transport layer causing display quality degradation
Solution Approach 1:
The patent introduces a leakage barrier control line as an intermediary element between adjacent sub-pixels. This control line generates a potential barrier that blocks the lateral leakage current through the hole transport layer, effectively preventing the harmful current flow while maintaining the shadow mask-free manufacturing process
Solution Approach 2:
The patent modifies the electrical parameters by introducing a controlled potential barrier through the leakage barrier control line. By changing the potential landscape in the hole transport layer, the patent creates regions of high potential that block lateral carrier flow, thus preventing leakage current while maintaining the simplified manufacturing process
2Object-affected harmful factors
If a leakage barrier control line is introduced to block lateral carrier flow, then lateral leakage current is reduced and display quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the device structure by introducing discrete leakage barrier control lines at specific locations between adjacent sub-pixels. This segmentation approach allows the potential barrier to be created only where needed to block lateral leakage, rather than requiring a comprehensive complex structure across the entire device
Solution Approach 2:
The patent applies local quality by positioning leakage barrier control lines specifically at the interfaces between adjacent sub-pixels where lateral leakage occurs. The potential barrier is created locally at these critical positions rather than uniformly across the entire device, minimizing the increase in device complexity while effectively addressing the leakage problem
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
Effectively controls lateral leakage current, enhancing display image clarity and chromaticity by creating potential barriers that block carrier flow, allowing for higher pixel density and reduced manufacturing complexity without the need for shadow masks.
Implementation Method 1
the leakage barrier control line will generate a potential barrier inside the first-type carrier layer that hinders a lateral flow of the first-type carrier
Implementation Method 2
using materials with specific work functions to form Schottky junctions or heterojunctions
Data Source
AI summary
A display panel includes: a substrate; a first electrode layer disposed on one side of the substrate; a pixel definition layer with a plurality of opening structures disposed on one side of the first electrode layer facing away from the substrate, where the opening structure exposes part of first electrodes. The barrier control gate is then disposed on the pixel definition layer. The first-type carrier layer, then is the light-emitting layer, the second-type carrier layer, and finally the second electrode layer, are sequentially deposit on the display panel as formed above.