Semiconductor Pixel Circuit Integrating Light Sensing and Display
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Solution Overview
Problem
Current semiconductor devices lack a combination of high-resolution display and light sensing functions, particularly in a compact and reliable form, which is essential for advanced authentication and touch sensing applications.
Innovation Solution
A semiconductor device is designed with multiple pixels, each incorporating a light-emitting device for display and light-receiving devices for sensing, including visible and infrared light capabilities, along with a specific pixel circuit configuration that allows for efficient light emission and reception, enabling high-resolution imaging and touch sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light-receiving devices are integrated into display pixels, then light sensing function is achieved, but device complexity increases
Solution Approach 1:
The patent combines light-emitting devices and light-receiving devices within the same pixel structure, integrating display and sensing functions into a unified device. This merging approach achieves multifunctionality while managing complexity through shared structural elements and coordinated circuit design.
Solution Approach 2:
Each pixel is designed to perform multiple functions: displaying visual information through light emission and sensing environmental light or touch through light reception. This multi-functionality is achieved by incorporating both light-emitting and light-receiving capabilities within the same pixel circuit architecture.
2Measurement precision
If multiple light-receiving devices are included per pixel, then sensing precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The pixel circuit is divided into multiple functional components including first and second light-receiving devices, each with specific electrodes and connection paths. This segmentation allows for specialized optimization of each component while maintaining overall manufacturing feasibility through modular fabrication processes.
Solution Approach 2:
Different regions of the pixel structure are optimized for different functions: light-emitting regions are optimized for display performance while light-receiving regions are optimized for sensing precision. This local quality differentiation allows each component to perform its specific function at high performance levels without requiring uniform high precision across the entire structure.
3Adaptability or versatility
If integrated light sensing is added to display, then authentication functionality is enhanced, but reliability challenges arise
Solution Approach 1:
The light-receiving devices provide feedback signals based on detected light conditions, enabling authentication functions such as fingerprint recognition or ambient light sensing. This feedback mechanism enhances authentication capability while maintaining reliability through controlled signal processing and validation protocols.
Solution Approach 2:
The device incorporates redundant circuit elements and protective structures in the pixel circuit design to prevent failures before they occur. This includes multiple transistors for signal processing, capacitors for signal stabilization, and structured electrode arrangements that provide fail-safe operation modes.
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 semiconductor device achieves a high-resolution display with integrated light sensing capabilities, enhancing authentication and touch sensing functionalities while maintaining a compact and reliable design.
Implementation Method 1
Light-emitting devices utilizing an electroluminescence (hereinafter, referred to as EL) phenomenon
Implementation Method 2
a first light-receiving device, a second light-receiving device
Data Source
AI summary
A semiconductor device having a light sensing function and including a high-resolution display portion is provided. The semiconductor device includes a plurality of pixels, and the pixels each include first and second light-receiving devices, first to fifth transistors, a capacitor, and a first wiring. One electrode of the first light-receiving device is electrically connected to the first wiring, and the other electrode is electrically connected to one of a source and a drain of the first transistor. One electrode of the second light-receiving device is electrically connected to the first wiring, and the other electrode is electrically connected to one of a source and a drain of the second transistor. The other of the source and the drain of the second transistor is electrically connected to the other of the source and the drain of the first transistor. The other of the source and the drain of the first transistor is electrically connected to one electrode of the capacitor, one of a source and a drain of the third transistor, and a gate of the fourth transistor.