Array Substrate Protective Layer for DC Voltage Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display devices suffer from afterimages due to residual direct current voltage (R-DC), which affects display quality by causing image retention when the initial image is displayed for a long time.
Innovation Solution
An array substrate with a protective layer comprising a high resistance first layer and a low resistance second layer is used between the first and second electrodes, allowing for rapid release of DC voltage and minimizing afterimages without reducing the orientation force of the liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single protective layer is used between the pixel electrode and common electrode, then the device structure is simple, but residual DC voltage accumulates causing afterimages
Solution Approach 1:
The protective layer is divided into two distinct layers: a first protective layer with high resistance (10^12 to 10^16 Ωcm) and a second protective layer with low resistance (10^8 to 10^12 Ωcm). This segmentation allows the high resistance first layer to maintain orientation force while the low resistance second layer rapidly releases residual DC voltage, thereby reducing afterimages without compromising device simplicity
Solution Approach 2:
Different regions of the protective layer structure are assigned different resistance characteristics. The first protective layer (closer to pixel electrode) has high resistance to preserve orientation force, while the second protective layer (closer to common electrode) has low resistance to release residual DC voltage. This local differentiation of properties resolves the contradiction between maintaining orientation force and reducing afterimages
2Reliability
If the resistance of the protective layer is reduced to release DC voltage, then afterimages are reduced, but the orientation force of the liquid crystal molecules is weakened
Solution Approach 1:
The protective layer is segmented into two functional layers with different resistance values. The first protective layer maintains high resistance to preserve orientation force, while the second protective layer provides low resistance for rapid DC voltage release. This segmentation allows both contradictory requirements to be satisfied in different parts of the same component
Solution Approach 2:
The protective layer structure exhibits local quality differentiation where the first protective layer has high resistance characteristics for orientation maintenance, and the second protective layer has low resistance characteristics for DC voltage release. This local property assignment resolves the contradiction between orientation force and DC release speed
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 afterimages and maintains high orientation force, improving display quality by swiftly releasing residual DC voltage through the low resistance layer while maintaining the high orientation force of the polyimide-based orientation film.
Implementation Method 1
a second layer having a second resistance value, wherein the second resistance value is less than the first resistance value
Implementation Method 2
maintaining the high orientation force of the polyimide-based orientation film
Data Source
AI summary
An array substrate includes a first substrate, a thin film transistor disposed on the first substrate, a first electrode located on the first substrate, a protective layer located on the first electrode, and a second electrode located on the protective layer, wherein the protective layer includes a first layer and a second layer, the first layer has a first resistance value, the second layer has a second resistance value, the first layer is located between the first electrode and the second layer, and the second resistance value is less than the first resistance value.