Charge-Distributing Counter for Accurate Ambient Light Pulse Counting
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Solution Overview
Problem
Conventional ambient light sensors have poor accuracy in sensing ambient light intensity, leading to discomfort for users due to inadequate screen brightness adjustments.
Innovation Solution
A counter with a charge distributing circuit, including a first capacitor, current supplying component, operational amplifier, and phase switch circuits, which accurately counts pulse waves without requiring high-speed operational amplifiers, enabling precise ambient light intensity measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ambient light sensors are used, then the device complexity is low, but the measurement precision of ambient light intensity is poor
Solution Approach 1:
The patent segments the counting process into two distinct phases using two separate switch circuits: a first switch circuit for counting rising edges of the operation amplified signal, and a second switch circuit for counting falling edges. This segmentation allows each circuit to specialize in one direction of signal transition, improving counting accuracy while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The patent introduces two capacitors as intermediary energy storage elements: a first capacitor that stores charge during the rising edge counting phase, and a second capacitor that stores charge during the falling edge counting phase. These capacitors act as intermediaries that accumulate electrical charge proportionally to the light intensity, enabling precise measurement without requiring complex high-speed operational amplifiers
2Measurement precision
If high-speed operational amplifiers are used to accurately count pulse waves, then the measurement precision improves, but the use of energy increases and device complexity increases
Solution Approach 1:
The patent replaces expensive, high-power high-speed operational amplifiers with simpler, low-power components including standard operational amplifiers, capacitors, and switch circuits. The system uses readily available components that consume minimal energy, achieving the same pulse wave counting accuracy through a different architectural approach that doesn't rely on high-speed amplification
Solution Approach 2:
The patent extracts the high-speed amplification function from the operational amplifier and replaces it with a dedicated charge distributing circuit consisting of capacitors and switch circuits. This extraction allows the operational amplifier to operate at lower speeds with reduced energy consumption, while the counting function is handled by the specialized charge distribution mechanism
3Measurement precision
If high-speed operational amplifiers are used to accurately count pulse waves, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent segments the counting process into two distinct phases using two separate switch circuits: a first switch circuit for counting rising edges of the operation amplified signal, and a second switch circuit for counting falling edges. This segmentation allows each circuit to specialize in one direction of signal transition, improving counting accuracy while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The patent introduces two capacitors as intermediary energy storage elements: a first capacitor that stores charge during the rising edge counting phase, and a second capacitor that stores charge during the falling edge counting phase. These capacitors act as intermediaries that accumulate electrical charge proportionally to the light intensity, enabling precise measurement without requiring complex high-speed operational amplifiers
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 counter effectively adjusts screen brightness by accurately counting pulse waves, improving user comfort by accurately measuring ambient light intensity.
Implementation Method 1
The current supplying component includes an optoelectronic component. The optoelectronic component is configured to convert light energy irradiated through the optoelectronic component into the current.
Data Source
AI summary
A counter is provided. A charge distributing circuit includes a first switch, a second switch, a third switch, a fourth switch, a third capacitor and a fourth capacitor. A first terminal of the first switch and a first terminal of the third switch are connected to a first input terminal of an operational amplifier. A second terminal of the first switch is connected to a first terminal of the third capacitor and a first terminal of the fourth switch. A second terminal of the third switch is connected to a first terminal of the fourth capacitor and a first terminal of the second switch. A second terminal of the third capacitor and a second terminal of the fourth capacitor are grounded. A second terminal of the second switch and a second terminal of the fourth switch are coupled to a reference voltage.