Display Substrate Ambient Light Sensing With ESD Compensation
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Solution Overview
Problem
Display devices face challenges in automatically adjusting screen brightness based on ambient light conditions, leading to suboptimal visual experiences due to the limitations of existing light sensing technologies.
Innovation Solution
A display substrate incorporating photosensitive transistor units, ESD protection units, and a compensation method that utilizes a reference current and detection current to determine ambient light conditions, allowing for precise adjustment of screen brightness and color temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photosensitive transistor units are used for ambient light detection, then measurement precision is improved, but device complexity increases due to additional ESD protection units and signal lines
Solution Approach 1:
The patent introduces photosensitive ESD protection units as intermediary components between the photosensitive transistor units and the common signal line. These protection units serve as mediators that both protect the sensitive photosensitive transistors from electrostatic discharge and facilitate signal transmission, thereby resolving the contradiction by adding protective functionality without proportionally increasing overall system complexity
Solution Approach 2:
The photosensitive ESD protection units are designed to perform multiple functions: they provide electrostatic discharge protection to the photosensitive transistor units while simultaneously serving as part of the signal transmission path. This multi-functionality reduces the need for separate protection circuits, thereby improving measurement precision without excessively increasing device complexity
2Reliability
If multiple photosensitive transistor units with ESD protection are added, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the photosensitive detection system into multiple independent transistor units, each with its own ESD protection. This segmentation allows each unit to be manufactured and tested independently, improving overall reliability while enabling modular manufacturing processes that can maintain precision requirements through standardized fabrication steps
Solution Approach 2:
The patent employs shading layers with specific optical properties that can be precisely controlled during manufacturing. By optimizing the optical parameters of the shading layers rather than relying solely on geometric precision, the system achieves high reliability in light detection while reducing the stringency of mechanical alignment requirements during fabrication
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 enables accurate ambient light detection and automatic brightness adjustment, enhancing visual performance by ensuring optimal screen brightness and color temperature alignment with the ambient environment.
Implementation Method 1
a plurality of photosensitive transistor units... located in the peripheral region... for detecting the ambient light
Data Source
AI summary
A display substrate includes a base substrate, a plurality of photosensitive transistor units, a plurality of photosensitive ESD protection units, and at least one common signal line. The base substrate includes a display region, a peripheral region located at a periphery of the display region, and a binding region located at a side of the display region. The plurality of photosensitive transistor units, the plurality of photosensitive ESD protection units and the at least one common signal line are located in the peripheral region. The plurality of photosensitive transistor units is connected with binding pins in the binding region through a plurality of signal lines. At least one photosensitive ESD protection unit is connected with, and located between, at least one signal line and the common signal line.