Adapter Device for Display Test Voltage Compensation
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Solution Overview
Problem
During screen lighting tests, the logic input voltage VDD supplied to a printed circuit board (PCB) in display devices like LCDs and OLEDs is not constant due to voltage drops across adapter boards and cables, requiring manual adjustments with a multimeter, which is inconvenient.
Innovation Solution
An adapter device with a voltage conversion circuit, feedback circuit, and compensation circuit that compares the test voltage with a reference voltage and generates a compensation voltage to maintain a stable logic input voltage, eliminating the need for manual adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual adjustment with multimeter is used to maintain constant logic input voltage, then voltage stability is improved, but operation convenience deteriorates
Solution Approach 1:
The adapter device performs automatic voltage compensation through an integrated feedback mechanism. The feedback circuit continuously monitors the logic input voltage and automatically adjusts the compensation voltage without requiring manual intervention with multimeters, making the system self-regulating while maintaining voltage stability
Solution Approach 2:
The feedback circuit compares the actual logic input voltage with a reference voltage and generates compensation signals accordingly. This closed-loop feedback mechanism automatically corrects voltage deviations caused by load changes, eliminating the need for manual measurement and adjustment
2Device complexity
If adapter board and adapter cable are used to supply voltage, then device complexity is reduced, but voltage stability deteriorates due to voltage drops
Solution Approach 1:
The compensation circuit proactively generates a compensation voltage that counteracts the expected voltage drops across the adapter board and cable. By anticipating and compensating for these losses before they affect the logic input voltage, the system maintains stable voltage delivery through the existing adapter infrastructure without adding complex voltage regulation hardware
Solution Approach 2:
The compensation circuit acts as an intermediary element that injects an additional voltage component to offset the voltage drops introduced by the adapter board and cable. This mediator circuit allows the simple adapter structure to deliver stable voltage by dynamically compensating for its own inherent voltage losses
3Reliability
If manual voltage adjustment is performed for each frame switching, then voltage stability is improved, but test efficiency deteriorates
Solution Approach 1:
The feedback circuit operates continuously to monitor and maintain logic input voltage stability throughout the entire test process, including during frame switching transitions. This continuous automatic adjustment eliminates the need for repeated manual interventions, maintaining voltage stability while enabling uninterrupted high-speed frame switching and improving overall test throughput
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 adapter device ensures a constant logic input voltage across different loads, simplifying the screen lighting test process by automatically adjusting the voltage, thereby improving test efficiency and reducing manual intervention.
Implementation Method 1
a voltage conversion circuit disposed on the adapter board and connected to the voltage input terminal and configured to convert the voltage of the external power supply received at the voltage input terminal into a test voltage
Implementation Method 2
a feedback circuit connected to the voltage conversion circuit and configured to compare the test voltage with a reference voltage to provide feedback data
Implementation Method 3
a compensation circuit connected to the feedback circuit and the adapter board, and configured to generate a compensation voltage based on the feedback data and apply the compensation voltage to the adapter board to compensate for the test voltage
Data Source
AI summary
An adapter device for test, including: an adapter board having a voltage input terminal connected to an external power supply and an output terminal connected to a terminal to be tested; a voltage conversion circuit disposed on the adapter board and connected to the voltage input terminal and configured to convert the voltage of the external power supply received at the voltage input terminal into a test voltage to be supplied to the terminal to be tested; a feedback circuit connected to the voltage conversion circuit and configured to compare the test voltage with a reference voltage to provide feedback data; and a compensation circuit connected to the feedback circuit and the adapter board, and configured to generate a compensation voltage based on the feedback data and apply the compensation voltage to the adapter board to compensate for the test voltage.