3D Shutter Glasses Power Circuit Without Feedback Control
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Solution Overview
Problem
Shutter type glasses apparatuses for 3D stereoscopic displays face challenges in reducing weight, material costs, and power consumption, leading to shorter battery discharge times due to increased circuit components and complexity.
Innovation Solution
A glasses apparatus with a shutter glasses unit, synchronous signal receiving unit, DC/DC converter unit, and control unit that uses a PWM signal to control the DC/DC converter and shutter glasses driving unit, eliminating the need for a feedback control circuit and reducing the number of circuit components, thereby minimizing weight, material costs, and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feedback control circuit is used to control the DC/DC converter unit, then the output DC voltage can be regulated, but the number of circuit components increases causing increased weight and material costs
Solution Approach 1:
The patent extracts and removes the feedback control circuit from the glasses apparatus, eliminating the circuit components that cause weight increase. Instead of using a complex feedback control system, the invention uses a simple PWM signal from a control unit to directly control the DC/DC converter unit, achieving voltage regulation without the additional weight of feedback control components.
Solution Approach 2:
The patent changes the control parameter approach from feedback-based voltage regulation to PWM duty cycle control. By varying the PWM signal parameters (duty ratio) generated by the control unit, the DC/DC converter unit can regulate its output voltage without requiring additional feedback control circuitry, thus reducing the number of components and overall weight.
2Reliability
If a feedback control circuit is used to control the DC/DC converter unit, then the output DC voltage can be regulated, but the number of circuit components increases causing increased material costs
Solution Approach 1:
The patent extracts and removes the feedback control circuit from the glasses apparatus, eliminating the circuit components that cause material cost increase. Instead of using a complex feedback control system, the invention uses a simple PWM signal from a control unit to directly control the DC/DC converter unit, achieving voltage regulation without the additional material costs of feedback control components.
Solution Approach 2:
The patent replaces expensive feedback control circuit components with a simpler, more cost-effective PWM control approach. The control unit generates PWM signals that directly control the DC/DC converter, eliminating the need for costly feedback control circuitry while maintaining voltage regulation functionality, thus reducing material costs for mass production.
3Reliability
If a feedback control circuit is used to control the DC/DC converter unit, then the output DC voltage can be regulated, but the power consumption increases reducing battery discharge time
Solution Approach 1:
The patent extracts and removes the feedback control circuit from the glasses apparatus, eliminating the power consumption associated with feedback control components. By using a simple PWM signal from a control unit to directly control the DC/DC converter unit, the system achieves voltage regulation with minimal power consumption, thereby extending battery discharge time.
Solution Approach 2:
The patent uses periodic PWM signals to control the DC/DC converter unit instead of continuous feedback control. The PWM signal periodically switches the converter on and off with a fixed duty ratio, regulating the output voltage through periodic action rather than continuous power-consuming feedback control, thus reducing overall power consumption and extending battery life.
4Reliability
If the number of circuit components is increased for feedback control, then the output DC voltage can be regulated, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the feedback control circuit from the glasses apparatus, significantly reducing the number of circuit components. By using a simple PWM signal from a control unit to directly control the DC/DC converter unit, the system achieves voltage regulation with minimal circuit complexity, eliminating the need for additional feedback control components.
Solution Approach 2:
The control unit in the patent serves multiple functions: it generates the PWM signal for DC/DC converter control and also controls the shutter glasses driving unit. This multi-functionality reduces the need for separate dedicated control circuits, thereby reducing overall device complexity while maintaining effective voltage regulation.
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 results in a lighter, cost-effective glasses apparatus with extended battery discharge time by using a fixed duty ratio PWM signal and eliminating the need for a feedback control circuit, reducing power consumption and component count.
Implementation Method 1
a DC/DC converter unit converting a DC voltage provided from a battery
Implementation Method 2
a control unit which controls the DC/DC converter unit to apply the converted DC voltage to the shutter glasses driving unit by supplying of a PWM signal to the DC/DC converter unit
Data Source
AI summary
Glasses apparatus interlocking with a 3D display device is provided. The glasses apparatus includes a shutter glasses unit, a synchronous signal receiving unit receiving a synchronous signal from the 3D display device, a shutter glasses which drives unit driving the shutter glasses unit, a DC/DC converter unit which converts converting a DC voltage provided from a battery, and a control unit which controls the DC/DC converter unit to apply the converted DC voltage to the shutter glasses driving unit through supplying of a PWM signal to the DC/DC converter unit and controlling the shutter glasses driving unit, which is driven by the applied DC voltage, to turn on/off the shutter glasses unit according to the synchronous signal.