Auto Darkening Filter Segmented Liquid Crystal Control
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Solution Overview
Problem
Existing auto darkening filters struggle to achieve higher light-shielding numbers and optimal eye protection while minimizing power consumption.
Innovation Solution
The auto darkening filter incorporates a first and second positive liquid crystal, a negative-phase liquid crystal, and a control circuit system that adjusts voltage and frequency of control signals to achieve higher light-shielding numbers, with a main control circuit coordinating the liquid crystal control circuits and a light control circuit to set and adjust light-shielding darkness based on detected light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the light-shielding number is increased to improve eye protection, then the darkness effect is enhanced, but the power consumption increases
Solution Approach 1:
The liquid crystal assembly is divided into multiple independent liquid crystal units (first positive liquid crystal, second positive liquid crystal, negative-phase liquid crystal) that can be controlled separately. This segmentation allows selective activation of only the necessary liquid crystal units to achieve the required light-shielding number, rather than activating all units simultaneously, thereby reducing overall power consumption while maintaining effective eye protection.
Solution Approach 2:
The control circuit dynamically adjusts the voltage amplitude and frequency of control signals applied to different liquid crystal units based on the detected welding arc intensity and the required light-shielding number. This dynamic control enables the system to use minimum necessary power for each specific protection level, avoiding constant high-power consumption even when maximum shielding is not required.
2Object-affected harmful factors
If the light-shielding number is increased to achieve higher darkness effect, then eye protection is improved, but it becomes difficult to achieve light-shielding number above 13
Solution Approach 1:
By dividing the liquid crystal assembly into multiple independently controllable units with different liquid crystal types (positive and negative-phase), the system can combine their shielding effects additively. This segmentation enables achieving light-shielding numbers above 13 by activating multiple units in series, overcoming the limitation of single liquid crystal units which typically max out around No. 13.
Solution Approach 2:
The patent uses a composite liquid crystal assembly combining different types of liquid crystals (positive liquid crystals and negative-phase liquid crystals) with different optical properties. This composite structure allows the system to achieve higher and more variable light-shielding numbers by controlling the combination and arrangement of different liquid crystal materials, enabling reliable achievement of No. 14-15 and beyond.
3Adaptability or versatility
If the voltage amplitude of control signal is adjusted to change light-shielding number, then the light-shielding number can be changed in range No. 5 to 13, but it is difficult to achieve higher light-shielding number
Solution Approach 1:
The liquid crystal assembly is segmented into multiple controllable units that can be activated in different combinations. This segmentation expands the achievable light-shielding range beyond what a single unit can provide, enabling the system to reliably achieve light-shielding numbers from No. 5 to No. 15 and beyond by selectively activating different numbers and types of liquid crystal units.
Solution Approach 2:
The system changes multiple parameters simultaneously including the number of activated liquid crystal units, the type of liquid crystal units activated (positive or negative-phase), the voltage amplitude, and the frequency of control signals. This multi-parameter control approach enables achieving a broader and more reliable range of light-shielding numbers compared to adjusting only voltage amplitude of a single liquid crystal unit.
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 configuration allows for higher light-shielding numbers and optimized eye protection while reducing power consumption, enabling better eye protection and improved user comfort through adjustable darkness settings.
Implementation Method 1
the liquid crystal in the auto darkening filter typically contains two pieces of positive liquid crystals... The control circuit outputs a square wave signal to the two pieces of positive liquid crystals, thereby instantaneously triggering the liquid crystal
Implementation Method 2
The ultraviolet rays and infrared rays in the welding arc are reflected off; appropriate visible light is projected to the eye ground of the user
Data Source
AI summary
An auto darkening filter, comprising: a first positive liquid crystal (LCD1) a second positive liquid crystal (LCD2); a first liquid crystal control circuit (A) configured to control the first positive liquid crystal (LCD1) and the second positive liquid crystal (LCD2) based on a received control signal; a negative-phase liquid crystal (LCD3) provided between the first positive liquid crystal (LCD1) and the second positive liquid crystal (LCD2); a second liquid crystal control circuit (B) configured to control the negative-phase liquid crystal (LCD3) based on a received control signal; a UV/IR filter configured to filter a welding arc; a light control circuit configured to detect the welding arc, generate a corresponding control signal based on the detected intensity of the welding arc, and output the corresponding control signal to a main control circuit.