Light Detection Unit for Blinking Light Interference
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Solution Overview
Problem
Existing light sensors struggle to accurately detect illuminance in environments where light blinks at 100 Hz or 120 Hz, such as those with fluorescent lighting, due to interference from blinking light sources.
Innovation Solution
An electro-optical device with a light detection unit that performs multiple detection operations at non-integer multiples of 1/100 or 1/120 second intervals, using a light-receiving sensor and detection circuit to improve precision by minimizing sampling time and avoiding uniform detection intervals that align with blinking periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the light detection unit performs detecting operation at uniform time intervals, then the detection process is simple and easy to implement, but the detection precision deteriorates in environments with blinking light at 100 Hz or 120 Hz
Solution Approach 1:
The patent applies dynamics by making the detection time interval variable rather than fixed. The control unit dynamically adjusts the detection time interval based on the blinking frequency of ambient light, selecting from multiple predetermined intervals to avoid coincidence with light blinking periods. This resolves the contradiction by maintaining operational simplicity through predetermined intervals while achieving high precision through dynamic selection of appropriate intervals.
Solution Approach 2:
The patent changes the parameter of detection time interval to resolve the contradiction. By providing multiple predetermined time intervals and selectively choosing the most appropriate one based on ambient light conditions, the system maintains simplicity of implementation while achieving high detection precision. The parameter change allows the system to adapt to different lighting environments without complex real-time adjustments.
2Productivity
If the detection time interval is set to integer multiple of 1/100 second or 1/120 second, then the detection operation aligns with the blinking period of fluorescent light, but the detection precision deteriorates due to interference from blinking light
Solution Approach 1:
The patent applies preliminary anti-action by proactively selecting detection time intervals that are NOT integer multiples of 1/100 second or 1/120 second. The control unit is pre-programmed with multiple predetermined intervals and automatically selects those that avoid coincidence with fluorescent light blinking periods (100 Hz or 120 Hz). This prevents interference before it occurs, maintaining both detection efficiency and precision.
Solution Approach 2:
The patent uses periodic action with varying periods by providing multiple predetermined detection time intervals. Instead of using a fixed periodic interval that might coincide with light blinking, the system employs different periodic intervals selected based on ambient light conditions. This allows the detection operation to maintain efficiency through regular periodic sampling while avoiding interference from blinking light sources.
3Measurement precision
If multiple detecting operations are performed to improve precision, then the measurement accuracy improves, but the power consumption increases and response time increases
Solution Approach 1:
The patent applies dynamics by making the number of detection operations variable rather than fixed. The control unit dynamically determines the appropriate number of detecting operations based on ambient light conditions and selects from multiple predetermined time intervals. This allows the system to achieve high precision when needed while reducing power consumption by performing fewer operations when conditions permit, thus resolving the contradiction between precision and energy usage.
Solution Approach 2:
The patent changes the parameter of detection operation count and time interval to resolve the contradiction. By providing multiple predetermined combinations of detection counts and time intervals, the system can select the most appropriate configuration for current conditions. This parameter change enables the system to achieve high precision with minimal power consumption by avoiding unnecessary repeated detections when a single well-timed detection suffices.
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 high-precision illuminance detection even in environments with blinking light, improving image quality and reducing power consumption while allowing for longer battery life in electronic devices.
Implementation Method 1
a light-receiving sensor (350P) disposed on the active matrix substrate or the counter substrate to measure illuminance of ambient light of the liquid crystal panel
Data Source
AI summary
An electro-optical device includes: a panel having a display area in which an electro-optical material is interposed between first and second substrates; and a light detection unit disposed on the first or second substrate to detect illuminance of ambient light of the panel, wherein the light detection unit performs a detecting operation plural times at a predetermined time interval, and wherein the predetermined time interval is set to be a value except for an integer multiple of 1/100 sec or 1/120 sec or a value close thereto.