OLED Display Device Reducing Parasitic Capacitance via Low Dielectric Insulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Active matrix OLEDs suffer from parasitic capacitance issues due to their complex structure, which deteriorates display quality and increases power consumption as display area and resolution increase.
Innovation Solution
A display device is designed with a photosensor including a semiconductor layer, input and output terminals, and a controller that adjusts the pixel electrode input based on the photosensor's output, utilizing an interlayer insulating layer with a low dielectric constant to reduce parasitic capacitance between the transparent electrode layer and the gate and data wiring lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If active matrix OLED structure with multiple transistors and wiring lines is used to achieve high resolution and large screen, then display area and resolution are improved, but parasitic capacitance increases deteriorating display quality
Solution Approach 1:
The patent changes the dielectric constant parameter of the insulating layer by selecting materials with lower dielectric constants (such as organic insulating materials instead of traditional inorganic materials). This parameter change directly reduces the parasitic capacitance formed between wiring lines and electrodes, resolving the contradiction between large display area and parasitic capacitance accumulation.
2Manufacturing precision
If multiple wiring line layers and transistors are arranged in each pixel to control emission, then high resolution is achieved, but parasitic capacitance between wiring lines increases power consumption
Solution Approach 1:
The patent reduces power consumption by changing the dielectric parameter of the insulating layer. Lower dielectric constant materials reduce capacitive coupling between adjacent wiring lines, thereby reducing the energy required to charge and discharge parasitic capacitances during operation, which directly addresses the power consumption issue in high-resolution displays.
3Ease of manufacture
If traditional inorganic insulating materials are used in interlayer, then manufacturing process is simple, but dielectric constant is high increasing parasitic capacitance
Solution Approach 1:
The patent employs composite material strategies by using organic insulating materials or composite structures that combine organic and inorganic layers. These materials provide lower dielectric constants while maintaining manufacturability through established coating techniques such as spin coating, slot die coating, or spray coating, thus resolving the contradiction between manufacturing simplicity and parasitic capacitance reduction.
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 solution effectively reduces parasitic capacitance, improving the display device's quality and reducing power consumption by compensating for transistor deterioration and adjusting data voltage accordingly.
Implementation Method 1
a photosensor arranged on the substrate... an output terminal electrically connected to the semiconductor layer... a controller controls an input to the pixel electrode based on an output of the photosensor
Implementation Method 2
utilizing an interlayer insulating layer with a low dielectric constant to reduce parasitic capacitance between the transparent electrode layer and the gate and data wiring lines
Data Source
AI summary
The invention provides a display device including an insulating substrate, a photosensor formed on the insulating substrate and including a semiconductor layer, an input terminal and an output terminal electrically connected to the semiconductor layer, a first insulating layer formed on the photosensor, a pixel electrode, an organic layer, and a common electrode layer sequentially formed on the first insulating layer, and a controller that controls an input to the pixel electrode based on an output of the photosensor.