Diode Temperature Sensor Layout for Display Panels
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Solution Overview
Problem
In electrooptical devices, such as liquid crystal devices, it is challenging to provide a semiconductor sensor with high sensitivity close to the display region due to the presence of signal output circuits and signal lines, which limits the ability to monitor temperature effectively and maintain display performance and lifetime.
Innovation Solution
The electrooptical device incorporates a semiconductor sensor with multiple diode elements disposed along the sides of the display region, connected by electrodes, and configured to avoid overlapping with signal lines, allowing for high sensitivity temperature monitoring while maintaining display flatness and preventing electrical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large-sized semiconductor sensor is disposed near the display region to detect temperature with high sensitivity, then temperature detection sensitivity is improved, but it becomes difficult to provide the sensor due to the presence of signal output circuits and signal lines
Solution Approach 1:
The semiconductor sensor is divided into multiple sensor elements arranged in a matrix configuration. Each sensor element corresponds to a specific region of the display panel, allowing temperature detection across different areas. This segmentation enables the sensor to achieve high detection sensitivity without requiring a single large sensor that would conflict with circuit layouts.
Solution Approach 2:
The sensor elements are arranged in a two-dimensional matrix pattern rather than using a single large sensor area. This dimensional transformation allows the sensor to cover multiple regions effectively while maintaining compatibility with the underlying circuit architecture, resolving the conflict between detection sensitivity and layout constraints.
2Reliability
If a semiconductor sensor is provided close to the display region to monitor temperature effectively, then temperature monitoring capability is improved, but electrical interference with signal lines may occur
Solution Approach 1:
The sensor elements are positioned in regions that are extracted or separated from the main signal line paths. By strategically locating sensor elements in areas minimized for signal line density and utilizing insulating structures, the design extracts the sensor functionality from regions of high electrical interference while maintaining close proximity to the display region for effective temperature monitoring.
Solution Approach 2:
Insulating structures and spacing are introduced as intermediary elements between the sensor elements and the signal lines. These intermediaries electrically isolate the sensor from potential interference sources while maintaining the spatial relationship necessary for accurate temperature sensing near the display region.
3Measurement precision
If multiple sensor elements are disposed along the side of the display region to achieve high sensitivity, then temperature detection accuracy is improved, but the region available for sensor placement is limited
Solution Approach 1:
The sensor is segmented into multiple small sensor elements arranged in a matrix pattern along the display region side. This segmentation allows the sensor to achieve high detection accuracy through multiple measurement points while fitting within the limited available area, as each element occupies a small space but collectively provides comprehensive coverage.
Solution Approach 2:
Sensor elements are strategically positioned in specific local regions where temperature monitoring is most critical. Rather than uniformly distributing sensors across all available space, the design places elements in locations that provide optimal temperature detection accuracy for the display region, making efficient use of the limited placement area.
Data Source
AI summary
In an electrooptical device, a plurality of scanning lines extend between a first side of a display region and a scanning line driving circuit. A semiconductor sensor is provided between the scanning line driving circuit and the first side of the display region, the semiconductor sensor including a sensor semiconductor layer which is on the same layer as a semiconductor layer of a pixel transistor. The semiconductor sensor is a diode temperature sensor, and includes a plurality of diode elements (sensor elements) that are disposed along the first side of the display region and electrodes that electrically connect the plurality of diode elements.