Optical Sensing Circuit Complementary Color Compensation
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Solution Overview
Problem
Conventional optical sensing circuits face challenges in accurately determining the color of mixed light sources, requiring multiple light sensing elements and complex algorithms, which increases circuit complexity and errors when dealing with ambient white light or multiple color inputs.
Innovation Solution
An optical sensing circuit comprising a capacitor, a light sensing unit, a compensation unit, and a switching element, where the light sensing unit and compensation unit are configured to sense complementary colors, allowing the switching element to read the capacitor voltage for color determination, reducing the complexity by using only three sensors for six colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional light sensing elements are used to correctly determine mixed light colors, then color determination accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the color sensing function into three independent sensing elements (red, green, blue) that each detect specific color components. By segmenting the sensing function and using complementary color compensation, the system can determine mixed light colors accurately without requiring a separate sensing element for every possible color combination.
Solution Approach 2:
Each light sensing element serves multiple functions: it detects its primary color component and also provides compensation information for complementary colors. The red sensing element compensates for cyan, green compensates for magenta, and blue compensates for yellow, allowing a single element to perform both detection and compensation roles.
2Measurement precision
If more light sensing elements are added to handle various color inputs, then color determination accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses only three light sensing elements (red, green, blue) segmented to detect primary color components, rather than using multiple elements for each possible color. This segmentation approach reduces the total number of sensing elements required while maintaining accurate color determination through computational compensation.
Solution Approach 2:
The patent changes the approach from hardware-based color detection (using separate sensing elements for each color) to a parameter-based solution where the same three sensing elements detect different color parameters (primary colors and their complementary colors) through algorithmic processing of the electrical signals.
3Illumination intensity
If conventional optical sensing circuits are used with ambient white light, then basic light detection is achieved, but signal-to-noise ratio decreases
Solution Approach 1:
The patent implements a feedback mechanism where the electrical signals from the three light sensing elements are processed to compensate for ambient white light effects. The compensation unit uses the detected signals to calculate and subtract the ambient light component, providing feedback that improves the signal-to-noise ratio and reliability of color determination.
Solution Approach 2:
The patent applies preliminary anti-action by using the compensation unit to preemptively counteract the harmful effect of ambient white light before it degrades the measurement. The system calculates the ambient light contribution from the three sensing elements and subtracts it in advance, preventing the signal-to-noise ratio from decreasing.
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
This solution effectively determines the color of mixed light sources with reduced circuit complexity and increased signal-to-noise ratio, minimizing errors caused by ambient white light, and achieving accurate color identification with fewer sensors.
Implementation Method 1
When the light source of a specific light color illuminates the optical sensing circuit, a light leakage current will be generated when the a-Si TFT element is turned off
Data Source
AI summary
An optical sensing circuit including a capacitor, a light sensing unit, a compensation unit, and a switching element is provided. The light sensing unit, the compensation unit, and the switching element are electrically connected to the capacitor. The light sensing unit senses the light of a first color. The compensation unit senses the light of a second color complementary to the first color. When a light illuminates the light sensing unit and the compensation unit, a first light component of the light corresponding to the first color causes the light sensing unit to generate a first current, and a second light component of the light corresponding to the second color causes the compensation unit to generate a second current, which reduces the amount of the charging or the discharging current when the first current charges or discharges the capacitor whose voltage is read as information for determining light color.