Light Sensing Capacitor Circuit for Display Panel Laser Detection
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Solution Overview
Problem
Light sensing elements in image displaying apparatuses, such as LCDs, face reduced accuracy due to broad sensitivity to ambient light, leading to noise interference and decreased signal-to-noise ratio when detecting intended light sources like laser pointers.
Innovation Solution
A light sensitive circuit comprising a light sensing capacitor and a driving transistor, with additional switching transistors and capacitors, is integrated into the display panel to enhance light sensing accuracy by increasing capacitance in response to intended light wavelengths, thereby reducing ambient light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light sensing elements with broad bandwidth sensitivity are used, then the device can detect various light sources including ambient light, but the light sensing accuracy decreases due to noise from ambient light sources
Solution Approach 1:
The patent applies local quality by making the light sensing capacitor selectively responsive to specific wavelengths of light rather than having uniform sensitivity across all wavelengths. This is achieved through material selection or structural design of the capacitor that creates wavelength-specific sensitivity, allowing the sensor to ignore ambient light wavelengths while detecting the intended laser wavelength, thus resolving the contradiction between broad adaptability and measurement precision
2Measurement precision
If the light sensing capacitor is made more sensitive to intended light wavelengths, then the signal-to-noise ratio improves, but the device becomes more selective and less responsive to ambient light
Solution Approach 1:
The patent applies parameter changes by modifying the sensitivity characteristics of the light sensing capacitor to specific wavelength parameters. By tuning the capacitor's response to be highly sensitive only to the intended light wavelength (e.g., laser wavelength) and insensitive to other wavelengths (ambient light), the system achieves high signal-to-noise ratio while maintaining appropriate selectivity, effectively resolving the contradiction between precision and adaptability
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 improves light sensing accuracy and signal-to-noise ratio by selectively responding to intended light sources, such as laser pointers, while minimizing the impact of ambient light, thus enhancing the performance of light sensing apparatuses.
Implementation Method 1
a light sensing capacitor configured to sense light, a capacitance of the light sensing capacitor being increased in proportion to an intensity of received light of a predetermined one or more wavelengths
Data Source
AI summary
A light sensitive circuit includes a light sensing capacitor and a driving transistor. The light sensing capacitor is configured to sense light of a predetermined one or more wavelengths. The driving transistor includes a gate electrode electrically connected to the light sensing capacitor and is configured to generate a light sensing current according to a voltage of the gate electrode in the driving transistor. A light sensing accuracy and a light sensing signal to noise ratio (SNR) of the display apparatus including a plurality of such light sensing capacitors may be improved relative to ones that do not include such light sensing capacitors.