Voltage Regulator for LCD Precision Adjustment
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Solution Overview
Problem
Existing voltage regulation methods for liquid crystal display apparatuses face increased errors as the desired potential difference between voltage levels becomes larger, making precise adjustment challenging, especially when using methods that adjust both voltage and current simultaneously.
Innovation Solution
A voltage regulator comprising a level shifting circuit, a voltage-to-current converting circuit, and an adder-subtracter circuit, which allows for precise adjustment of the potential difference by varying the current direction and magnitude, and using a resistance element to generate an adjustment voltage, thereby reducing errors across a wider adjustment range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback is performed to the bias current of the differential output amplifier based on comparison of reference voltage and center voltage of AC signal, then the center potential of AC signal can be adjusted, but the adjustment error becomes larger as the desired potential difference becomes larger
Solution Approach 1:
The patent divides the voltage adjustment process into two independent steps: first adjusting the center voltage of the AC signal to the reference voltage, and then adjusting the potential difference between the center voltage and output voltage. This segmentation allows each adjustment to be performed with small, precise steps rather than one large adjustment, thereby reducing cumulative errors while achieving a wide adjustment range.
Solution Approach 2:
The patent performs the center voltage adjustment as a preliminary action before the potential difference adjustment. By first establishing the center voltage at the reference voltage level, the system creates a stable baseline from which the second adjustment can be made with higher precision, reducing the overall adjustment error.
2Adaptability or versatility
If the voltage level between both ends of a resistor is increased to achieve larger desired potential difference, then the adjustment range is extended, but the setting error becomes larger
Solution Approach 1:
The patent segments the voltage adjustment into two independent adjustment mechanisms: one for center voltage and one for potential difference. This allows the system to achieve large overall voltage differences without requiring large individual adjustment steps, thereby maintaining precision even when the total adjustment range is large.
Solution Approach 2:
The patent employs dynamic adjustment where the second adjustment amount is determined based on the first adjustment amount and the desired potential difference. This dynamic approach allows the system to adaptively control the adjustment steps, ensuring precision is maintained across the entire adjustment range rather than being fixed.
3Ease of operation
If both center voltage and potential difference are adjusted simultaneously, then the adjustment process is simplified, but the cumulative error increases
Solution Approach 1:
The patent segments the adjustment process into two distinct sequential steps: first adjusting the center voltage to the reference voltage, then adjusting the potential difference. While this appears more complex than simultaneous adjustment, it actually improves precision by preventing cumulative errors from large simultaneous adjustments, and the control unit automates the process to maintain ease of operation.
Solution Approach 2:
The patent employs feedback mechanisms where the second adjustment amount is determined based on the first adjustment amount and the desired potential difference. This feedback control ensures that each adjustment step is precisely controlled, reducing cumulative errors while maintaining an automated process that remains easy to operate.
Data Source
AI summary
A voltage regulator 10 includes: a level shifting circuit unit 14 shifting a first voltage, which is a voltage level of a first power source 12, to a target value of a second voltage to output the shifted first voltage; a voltage-to-current converting circuit unit 20 varying a magnitude of an output current to output the current while changing a direction of a current using a variable power source 22 varying a voltage to larger and smaller values than a center voltage of an arbitrarily variable voltage range; and an adder-subtracter circuit unit 32 having a first terminal on one side, the first terminal being connected to an output terminal of the level shifting circuit unit, and a second terminal on the other side, the terminal being connected to a resistance element disposed between the second terminal and an output terminal, the resistance element allowing an output current of the voltage-to-current converting circuit unit to flow therethrough as a bias current, wherein a second voltage V2 is output from an output terminal 42.