Display Active Layer Layout for Photosensitivity and Mobility

Solution Overview

Problem

Current display devices face a challenge in achieving high signal intensity through photosensitization due to the limitations of active layers, where either high photosensitivity or high mobility cannot be simultaneously achieved, leading to weak signal strength.

Innovation Solution

A display device with a substrate layer and an active layer comprising a first body portion, a second body portion, and an additional portion, where the additional portion has a smaller band gap than the first and second body portions, allowing for increased signal intensity and improved performance by reducing the overall band gap of the active layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an active layer formed of amorphous silicon is used, then photosensitive effect is satisfied with high signal strength, but mobility is relatively low and cannot meet high refresh rate requirements

Engineering Contradiction:

Improvephotosensitive functionVSAvoidmobility

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent applies local quality by creating different active layer structures in different regions: the first active layer region uses amorphous silicon for high photosensitivity, while the second active layer region uses a different material composition for high mobility, allowing each region to optimize for its specific function

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by combining amorphous silicon with other semiconductor materials (such as polysilicon or crystalline silicon) in a multi-layer active layer structure, achieving both high photosensitivity from the amorphous silicon region and high mobility from the other material regions

Inventive Principle:

Principle #40Composite materials

2Speed

If an active layer formed of indium gallium zinc oxide is used, then mobility is high for large display with high refresh rate, but signal strength generated by laser irradiation is weak

Engineering Contradiction:

ImprovemobilityVSAvoidsignal strength

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent applies local quality by creating different active layer structures in different regions: the first active layer region uses amorphous silicon for high photosensitivity, while the second active layer region uses a different material composition for high mobility, allowing each region to optimize for its specific function

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by combining amorphous silicon with other semiconductor materials (such as polysilicon or crystalline silicon) in a multi-layer active layer structure, achieving both high photosensitivity from the amorphous silicon region and high mobility from the other material regions

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If photosensitive transistor and display transistor are manufactured by the same process, then manufacturing process is simplified, but both high photosensitive function and high mobility function cannot be achieved simultaneously

Engineering Contradiction:

Improvemanufacturing processVSAvoidphotosensitive function and mobility function

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies local quality by creating different active layer structures in different regions: the first active layer region uses amorphous silicon for high photosensitivity, while the second active layer region uses a different material composition for high mobility, allowing each region to optimize for its specific function

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by combining amorphous silicon with other semiconductor materials (such as polysilicon or crystalline silicon) in a multi-layer active layer structure, achieving both high photosensitivity from the amorphous silicon region and high mobility from the other material regions

Inventive Principle:

Principle #40Composite materials

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 enhances photosensitive performance and signal intensity, addressing the weakness in existing technologies by configuring the active layer with a smaller band gap additional portion, thereby improving the display device's overall performance.

Implementation Method 1

a band gap of the additional portion is smaller than a band gap of the first body portion and a band gap of the second body portion... enhances photosensitive performance and signal intensity

Methodology Applied

Scientific EffectPhotosensitization: Photoelectric Effect

Data Source

PatentUS12132053B2Display device and method of manufacturing the same

Publication Date: 2024.10.29 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

A display device and a method of manufacturing the same are disclosed. The display device includes a substrate layer and an active layer. The active layer includes a first body portion, a second body portion, and an additional portion. The first body portion is disposed on the first substrate area, the additional portion is disposed on the first body portion, the second body portion is arranged on the second substrate area, and the first body portion and the additional portion are not connected to the second body portion, wherein a band gap of the additional portion is smaller than a band gap of the first body portion and a band gap the second body portion.