Transparent Conductive Layer for OLED Signal-to-Noise Ratio
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Solution Overview
Problem
Existing OLED display devices face challenges in improving the signal-to-noise ratio of sensing signals, particularly in integrated fingerprint identification and touch control functions.
Innovation Solution
A display panel design that includes a display functional layer, a functional electrode layer located outside the display functional layer, and a transparent conductive layer electrically coupled to the functional electrode layer. The transparent conductive layer consists of a metal layer and a transparent metal oxide conductive layer, with the latter being thicker than the former, and is structured to enhance the signal-to-noise ratio without adversely affecting the display function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If functions such as fingerprint identification or touch control are integrated in an OLED display screen, then the display device gains additional functionality, but the signal-to-noise ratio of the sensing signal deteriorates
Solution Approach 1:
The patent segments the sensing system into two distinct layers: the display functional layer and the functional electrode layer. By separating the sensing electrodes from the display structure, the patent achieves both integrated functionality and improved signal-to-noise ratio, as the sensing signals are no longer interfered with by display elements
Solution Approach 2:
The patent moves the sensing electrodes from the traditional in-plane configuration within the display layer to an out-of-plane configuration by placing them on a separate functional electrode layer. This dimensional transition allows the sensing signals to be detected perpendicular to the display plane, effectively isolating them from display-related noise and improving measurement precision
2Measurement precision
If the transparent conductive layer uses a thicker transparent metal oxide conductive layer than metal layer, then the signal-to-noise ratio improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a quantitative parameter relationship: the thickness of the transparent metal oxide conductive layer should be greater than that of the metal layer. This parameter change optimizes the electrical properties and signal-to-noise ratio while providing clear manufacturing guidelines to control the thickness ratio
Solution Approach 2:
The patent employs a composite transparent conductive layer structure combining metal layer and transparent metal oxide conductive layer. This composite structure leverages the advantages of both materials: the metal layer provides high conductivity while the thicker transparent metal oxide layer enhances signal detection and maintains optical transparency, collectively improving signal-to-noise ratio
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 proposed solution effectively improves the signal-to-noise ratio of sensing signals, enhances touch accuracy, and maintains the display functionality by utilizing a transparent conductive layer with specific thickness ratios and structural configurations.
Implementation Method 1
a transparent conductive layer located at a side of the functional electrode layer away from the display functional layer and electrically coupled to the functional electrode layer, the transparent conductive layer at least including a metal layer and a transparent metal oxide conductive layer
Implementation Method 2
Organic Light-Emitting Diode (OLED) display devices have become a promising next-generation display technology
Data Source
AI summary
The present disclosure provides a display panel, a manufacturing method thereof, and a display device. The display panel includes: a display functional layer; a functional electrode layer located at a side of the display functional layer; and a transparent conductive layer located at a side of the functional electrode layer away from the display functional layer and electrically coupled to the functional electrode layer, the transparent conductive layer at least including a metal layer and a transparent metal oxide conductive layer, and a thickness of the transparent metal oxide conductive layer being greater than a thickness of the metal layer.