OLED Substrate Functional Patterns for Crosstalk Reduction
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Solution Overview
Problem
Existing OLED display devices suffer from pixel crosstalk due to transverse current leakage, leading to reduced color purity, increased power consumption, and decreased display quality, caused by p-type doping which reduces transverse resistance.
Innovation Solution
A display substrate with functional patterns of varying resistance values between the organic light-emitting layer and the anode, where sub-pixels with different colors have distinct driving voltages, and the resistance of these patterns is adjusted to maintain close actual driving voltages and reduce transverse current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If p-type doping is applied to the hole transport layer, then hole injection capability is improved and driving voltage is reduced, but transverse resistance decreases significantly causing transverse current leakage and pixel crosstalk
Solution Approach 1:
The patent applies different doping concentrations of p-type dopants to different sub-pixel regions (red, green, blue) based on their specific driving voltage requirements. The hole transport layer is divided into multiple regions with locally optimized doping concentrations, allowing each sub-pixel to achieve optimal hole injection while maintaining proper current confinement boundaries
Solution Approach 2:
The patent changes the doping concentration parameter of the hole transport layer to optimize both hole injection capability and transverse resistance. By adjusting the doping concentration, the patent achieves a balance between reducing driving voltage and preventing transverse current leakage that causes pixel crosstalk
2Productivity
If p-type doping is applied to reduce interface barrier, then hole injection capability increases, but transverse current flows to adjacent sub-pixels causing sneak lightening and color purity reduction
Solution Approach 1:
The patent implements local quality optimization by assigning different doping concentrations to different sub-pixel regions. This creates locally optimized hole transport characteristics that enhance injection capability where needed while maintaining current confinement boundaries that prevent transverse leakage to adjacent sub-pixels
Solution Approach 2:
The hole transport layer is segmented into multiple doped regions corresponding to different sub-pixels. Each segment has optimized doping characteristics that prevent current spreading between segments, thereby eliminating the sneak lightening effect while maintaining high hole injection capability in each region
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 solution effectively controls transverse current leakage between sub-pixels, improving pixel crosstalk issues and maintaining consistent driving voltages across sub-pixels, thereby enhancing color purity and reducing power consumption.
Implementation Method 1
a material doping concentration of the first functional pattern is higher than that of the second functional pattern
Data Source
AI summary
The present disclosure provides a display substrate and a display device. The display substrate comprises a base substrate and an anode, an organic light-emitting layer and a cathode formed on the base substrate sequentially, wherein the display substrate further comprises a plurality of functional patterns formed between the organic light-emitting layer and the anode, the plurality of functional patterns is divided into different types based on colors of a plurality of sub-pixels, and each type of the plurality of functional patterns is disposed in a region of the sub-pixel with a color corresponding to the type; the plurality of sub-pixels with different colors has different driving voltages, and a resistance value of each type of the plurality of the functional patterns in a direction perpendicular to the organic light-emitting layer is controlled to decrease as the driving voltage of the sub-pixel with the color corresponding to the type increases.