Array Substrate Photodiode Structure for Sensitive Large-Size Displays
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Solution Overview
Problem
Current liquid crystal display (LCD) technologies face challenges in enhancing the sensitivity of photosensors and improving their compatibility with large-size display technologies.
Innovation Solution
An array substrate is designed with a photosensitive unit that includes a photodiode structure composed of N-type heavily doped amorphous silicon, amorphous silicon, and P-type heavily doped amorphous silicon layers, along with specific electrode and semiconductor layer configurations, to enhance sensitivity and integration with large-sized devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photosensor structures are used, then manufacturing simplicity is maintained, but sensitivity is insufficient
Solution Approach 1:
The semiconductor layer is segmented into multiple distinct layers with different doping types and concentrations: a first semiconductor layer (N-type heavily doped), a second semiconductor layer (P-type heavily doped), and a third semiconductor layer (intrinsic or lightly doped). This segmentation creates a multi-layered photodiode structure that enhances sensitivity while maintaining manufacturability through standard thin-film deposition processes.
Solution Approach 2:
Different regions of the semiconductor structure are assigned different local qualities through varying doping concentrations and types. The heavily doped regions (first and second semiconductor layers) provide strong charge carrier generation, while the intrinsic or lightly doped third layer provides a high-resistance region for efficient charge separation. This local quality differentiation optimizes photosensor sensitivity without requiring complex overall device architecture.
2Adaptability or versatility
If photosensors are integrated into large-size display technology, then application scenarios are expanded, but compatibility and sensitivity enhancement are challenging
Solution Approach 1:
The photosensor structure is designed with universal compatibility for large-size display integration by using standard thin-film transistor-compatible materials and processes. The multi-layer semiconductor structure serves multiple functions: light detection, charge separation, and signal amplification, making it adaptable to various display sizes and applications while maintaining high sensitivity through the inherent properties of the segmented semiconductor layers.
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 integrates photosensors into large-sized devices, enhancing sensitivity and reducing costs while improving compatibility with large-size display technologies.
Implementation Method 1
a photosensor located between storage capacitor and the switch thin film transistor; wherein the photosensor is a photodiode structure
Data Source
AI summary
In the present disclosure, a photodiode structure is used as a photosensor in an array substrate. The semiconductor structure in the photosensor includes a N-type heavily doped amorphous silicon layer, an amorphous silicon layer, and a P-type heavily doped amorphous silicon layer, thereby realizing the integration of photosensors into large-sized devices, the enhancement of device sensitivity, and the reduction of costs.