Light Control Module Adjusting LED Frequency to Prevent Flicker
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Solution Overview
Problem
Conventional optical mice experience flicker discomfort and increased power consumption due to the low frequency operation of their light emitting diodes (LEDs) when in standby mode, as the LED frequency matches the photo sensor's low capture frequency, leading to imperceptible flickers.
Innovation Solution
A light control module that adjusts the frequency of the light emitting unit by inserting impulses between successive light emitting operations, ensuring the equivalent frequency remains above 60 Hz, even when the photo sensor operates at low frequencies, thus preventing flickers and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the light emitting unit operates at the same low frequency as the photo sensor in standby mode, then power consumption is reduced, but perceptible flickers are generated causing user discomfort
Solution Approach 1:
The patent applies dynamics by making the light emitting frequency adaptable rather than fixed. The control unit dynamically adjusts the light emitting frequency based on the photo sensor's operating mode (high frequency during normal operation, low frequency during standby). This dynamic adjustment allows the system to optimize both power consumption and flicker prevention across different operational states.
Solution Approach 2:
The patent changes the frequency parameter of the light emitting unit based on operational conditions. During standby mode, when the photo sensor operates at low frequency (e.g., 30 Hz), the control unit inserts additional light emitting impulses to increase the effective frequency to above 60 Hz, eliminating perceptible flickers while maintaining low power consumption.
2Object-affected harmful factors
If the light emitting unit operates at high frequency to prevent flickers, then user comfort is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action by using intermittent light emitting impulses synchronized with the photo sensor's capture cycles. During standby mode, the control unit inserts additional periodic impulses between the regular light emitting cycles, creating a modified periodic pattern that maintains frequency above 60 Hz to prevent flickers while keeping overall power consumption low due to the extended intervals between cycles.
Solution Approach 2:
The system dynamically adjusts the light emitting frequency based on operational state. During normal high-frequency operation, the light emits at the same high frequency as the photo sensor captures. During standby mode, it dynamically inserts additional impulses to maintain flicker prevention while operating at lower overall frequency, optimizing the balance between comfort and power consumption.
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 eliminates perceptible flickers and reduces power consumption by maintaining an acceptable flicker rate while prolonging the life of the light emitting unit, even during low-frequency photo sensor operations.
Implementation Method 1
a light emitting unit (505) emitting light according to an impulse of the second signal
Implementation Method 2
a photo sensor unit (504) executing a capture operation according to an impulse of the first signal
Data Source
AI summary
A light control module appropriate for an optical pointing device. The light control module comprises a processing unit outputting a first signal and a second signal, a photo sensor unit executing a capture operation according to an impulse of the first signal, and a light emitting unit executing a light emitting operation according to an impulse of the second signal, wherein when a frequency value of the first signal is less than a first preset value, at least one impulse is inserted between two successive impulses of the second signal for adjusting a frequency value of the second signal such that an equivalent frequency value corresponding to any two successive impulses of the second signal is greater than a second preset value, thus rendering flickers of the light emitting unit imperceptible.