Electro-Optical Substrate Sensor Circuit Isolation
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Solution Overview
Problem
In electro-optical devices, the electrical characteristics of sensor elements, such as diode elements for temperature detection, are not properly achieved due to issues with current paths and resistive elements on large substrates that are divided into smaller substrates, leading to inaccurate temperature detection and other sensor element performance problems.
Innovation Solution
A substrate configuration with specific terminal and resistive element arrangements allows for accurate measurement of sensor elements by isolating current paths and using a sensor drive circuit to manage voltage and current, ensuring proper operation of sensor elements on smaller substrates derived from larger mother substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mounting terminals are electrically connected by a resistive element to protect circuit elements from static electricity, then static electricity protection is improved, but current paths for sensor element testing are created causing measurement errors
Solution Approach 1:
The patent divides the substrate into multiple regions: a first region containing pixel areas and mounting terminals, and a second region containing sensor elements and their dedicated terminals. This segmentation isolates the sensor element circuit from the resistive elements connecting mounting terminals, preventing unwanted current paths while maintaining static electricity protection for the pixel circuitry.
Solution Approach 2:
The patent introduces dedicated mounting terminals (first terminal, second terminal, third terminal) as intermediaries specifically for sensor element connections. These dedicated terminals provide isolated access points for sensor testing, separating the sensor element circuit path from the resistive element paths used for static electricity protection of the pixel circuitry.
2Ease of manufacture
If a large substrate is divided into smaller substrates, then manufacturing flexibility is improved, but sensor element performance deteriorates due to unwanted current paths through resistive elements
Solution Approach 1:
The patent segments the substrate into distinct functional regions: a first region for pixel areas with mounting terminals, and a second region for sensor elements with dedicated terminals. This segmentation allows the substrate to be divided into smaller substrates while maintaining isolated, functional circuit paths for sensor elements that are not affected by resistive elements used for static electricity protection in the pixel region.
Solution Approach 2:
The patent applies different electrical connection strategies to different regions: the first region uses resistive elements for static electricity protection, while the second region uses dedicated low-resistance paths for sensor element operations. This local differentiation ensures that sensor elements maintain proper electrical characteristics even when the substrate is divided into smaller pieces.
3Reliability
If sensor elements are provided on substrates with existing resistive elements for static electricity protection, then comprehensive protection is improved, but sensor element functionality deteriorates due to conflicting current paths
Solution Approach 1:
The patent segregates the substrate into a first region containing pixel areas with resistive elements for static electricity protection, and a second region containing sensor elements with dedicated mounting terminals. This spatial segmentation ensures that current paths for sensor element testing do not intersect with resistive elements, eliminating measurement errors while maintaining comprehensive static electricity protection for the pixel circuitry.
Solution Approach 2:
The patent extracts the sensor element circuit from the pixel circuit region and places it in a separate second region with dedicated terminals. This extraction removes the sensor element path from the resistive element network used for static electricity protection, allowing independent optimization of both functions without interference.
Data Source
AI summary
A substrate for an electro-optical device includes a first mounting terminal and a second mounting terminal connected to a sensor element. The substrate for an electro-optical device includes a first resistive element including a first end electrically connected to the first mounting terminal and a second end electrically connected to the second mounting terminal, a second resistive element including a first end electrically connected to the first resistive element and a second end electrically connected to the second mounting terminal, and a third mounting terminal electrically connected to the second end of the first resistive element and the first end of the second resistive element.