Amplifier Circuit Buffer Stabilization Feedback
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Solution Overview
Problem
In liquid crystal display devices, buffer amplifiers experience variations due to transistor characteristics, leading to fluctuations in display brightness as voltage varies, necessitating stabilization of input signals to minimize voltage deviations.
Innovation Solution
An amplifier circuit with a buffer amplifier, a first switch, a first capacitor, and a second switch, where the first capacitor is charged with the potential difference between the input and output signals, and the input signal is supplied to the capacitor's second terminal, allowing the buffer amplifier to receive a voltage derived from the signal difference, enabling correction of the input signal level to stabilize the output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buffer amplifier is used to increase current supplying capability, then the signal stabilization is improved, but the output voltage varies due to transistor characteristics
Solution Approach 1:
The patent implements a feedback mechanism where the output voltage of the buffer amplifier is fed back through a feedback transistor (Q3) to the input side. This feedback loop automatically adjusts the input signal based on the actual output voltage, compensating for transistor characteristic variations and maintaining consistent output voltage across different devices and operating conditions.
Solution Approach 2:
The patent applies preliminary action by adding a predetermined voltage offset to the input signal before it enters the buffer amplifier. This pre-adjustment compensates for expected voltage drops or variations in the buffer amplifier, ensuring that the final output voltage remains stable and consistent despite transistor characteristic variations.
2Adaptability or versatility
If transistor characteristics vary, then the buffer amplifier performance changes, but display brightness becomes inconsistent
Solution Approach 1:
The feedback transistor (Q3) monitors the output voltage and adjusts the input signal accordingly, creating a self-regulating system that maintains consistent display brightness regardless of transistor characteristic variations. This feedback mechanism ensures that the buffer amplifier adapts to different transistor parameters while delivering uniform output voltage for consistent display performance.
Solution Approach 2:
The patent changes the input voltage parameter dynamically based on the output voltage feedback. By adjusting the input voltage offset according to actual operating conditions, the system compensates for transistor parameter variations and maintains consistent display brightness across different devices and operating states.
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 stabilizes the input signal level, compensating for buffer amplifier deviations and maintaining consistent display brightness by adjusting the input signal based on the signal difference, thereby reducing voltage variations and improving display quality.
Implementation Method 1
a first capacitor having a first terminal connected to the input terminal of the buffer amplifier and a second terminal connected to an output terminal of the buffer amplifier
Data Source
AI summary
An amplifier circuit and display device utilizing the amplifier circuit are provided. The amplifier circuit comprises a buffer amplifier which stabilizes an input signal and outputs a stabilized output signal. By supplying to the input terminal of the buffer amplifier, a voltage derived by adding a difference between the input signal and the output signal to the input signal, it is possible to change the input signal level in accordance with the deviation of the buffer amplifier, which allows correction of the output level to a suitable level.