Pixel Unit Structure with Barrier Layer Capacitor for High Aperture Ratio
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Solution Overview
Problem
The existing pixel unit structures in liquid crystal displays face a trade-off between maintaining a high aperture ratio and low manufacturing costs, as the addition of a storage capacitor to stabilize the pixel electrode potential reduces the aperture ratio and increases manufacturing complexity.
Innovation Solution
A pixel unit structure is designed with a thin film transistor and a first barrier layer opposite to the drain region, forming a capacitor with the drain region to provide storage capacitance without reducing the aperture ratio, and an optional second barrier layer is added to reduce light-induced drain current, maintaining the aperture ratio while simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a storage capacitor is added to stabilize pixel electrode potential, then potential stability is improved, but aperture ratio is reduced
Solution Approach 1:
The patent merges the storage capacitor function with the barrier layer structure. The barrier layer serves dual purposes: preventing light-induced current in the active layer and providing capacitor electrode functionality. By combining these functions into a single integrated structure, the patent avoids the need for separate capacitor components that would reduce aperture ratio.
Solution Approach 2:
The barrier layer is designed to perform multiple functions simultaneously: it acts as a light-shielding barrier to prevent carrier generation in the active layer, serves as a capacitor electrode for potential stabilization, and maintains structural integrity of the pixel unit. This multi-functionality eliminates the need for additional dedicated capacitor structures.
2Reliability
If a storage capacitor is added to stabilize pixel electrode potential, then potential stability is improved, but manufacturing complexity is increased
Solution Approach 1:
The storage capacitor is integrated into the existing barrier layer structure rather than being added as a separate component. The barrier layer and capacitor electrodes are formed as part of the same manufacturing process sequence, reducing the number of discrete manufacturing steps and simplifying the overall fabrication process.
Solution Approach 2:
The barrier layer is formed at an early stage in the manufacturing process, before subsequent electrode and insulating layer deposition. This preliminary formation of the capacitor structure allows subsequent layers to be built upon it without requiring additional complex alignment or fabrication steps.
3Reliability
If barrier layers are added to reduce light-induced drain current, then current stability is improved, but manufacturing complexity is increased
Solution Approach 1:
The light-shielding barrier layer and capacitor electrode are merged into a single integrated structure. This barrier layer is formed using the same manufacturing processes as other conductive layers in the device, eliminating the need for separate barrier layer fabrication steps and reducing overall manufacturing complexity.
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 configuration allows for a high aperture ratio in the pixel unit structure while keeping manufacturing costs low by integrating the barrier layers and reducing the drain electrode current, thus enhancing the display's potential stability and efficiency.
Implementation Method 1
a capacitor is formed between the first barrier layer and the drain region of the active layer
Implementation Method 2
an optional second barrier layer is added to reduce light-induced drain current
Data Source
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AI summary
The invention discloses a pixel unit structure, an array substrate and a display device and relates to the technical field of liquid crystal displays. The pixel unit structure has a storage capacitor and has a high aperture ratio and a low manufacturing cost of the pixel unit. The pixel unit structure comprises a thin film transistor (TFT) and a first barrier layer, wherein the first barrier layer is opposite to a drain region of an active layer of the TFT, and is connected to a common electrode of an array substrate, thereby a capacitor can be formed between the first barrier layer and the drain region of the active layer.