LCD High-Voltage Test via DC-DC Converter Merging
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Solution Overview
Problem
The existing methods for performing high-voltage stress tests on liquid crystal displays (LCDs) require a separate testing device and connector, increasing manufacturing costs due to the need for a dedicated high-voltage supply and connector circuit.
Innovation Solution
A testing device with a voltage converting unit comprising resistors and an input connector that uses a switching unit to output a ground voltage from an external power source, eliminating the need for a separate high-voltage supplier and connector circuit by integrating the voltage conversion within the LCD panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate testing device and connector are used to generate high voltage for HVS test, then the HVS test can be performed on LCD, but the manufacturing cost increases due to additional hardware requirements
Solution Approach 1:
The patent merges the high voltage generation function into the existing DC-DC converter by utilizing its internal resistors and switching unit. Instead of requiring a separate testing device, the DC-DC converter's voltage conversion capability is leveraged to generate the necessary high voltage for HVS testing, thereby eliminating additional hardware and reducing manufacturing costs.
Solution Approach 2:
The DC-DC converter is designed to serve dual purposes: its primary function of converting external power to supply power for gate driver and data driver, and a secondary function of generating high voltage for HVS testing. This multi-functionality eliminates the need for dedicated separate testing equipment, reducing overall system complexity and manufacturing cost.
2Reliability
If a separate connector is added to connect testing device to LCD, then high voltage can be supplied for testing, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the high voltage supply function with the existing DC-DC converter circuitry. The switching unit and resistors within the DC-DC converter are configured to generate high voltage without requiring separate connector circuits, thereby simplifying the overall device structure and reducing complexity.
Solution Approach 2:
The DC-DC converter utilizes its own internal components (switching unit, resistors) to generate the high voltage needed for HVS testing. This self-service capability eliminates the need for external testing devices and their associated connectors, reducing device complexity and the number of components required.
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 allows for cost-effective high-voltage testing of LCDs without the need for additional hardware, reducing manufacturing costs and simplifying the testing process.
Implementation Method 1
The voltage converting unit includes a DC/DC converter
Implementation Method 2
The power supplier includes a switching unit to output a ground voltage to the terminal when power is applied from an external power source
Data Source
AI summary
A testing device for performing a high-voltage test on a liquid crystal display is provided. The testing device includes a voltage converting unit, an input connector, and a power supplier. The voltage converting unit includes a plurality of resistors between an output terminal and a ground terminal. The input connector includes a terminal connected to one node of the plurality of resistors. The power supplier includes a switching unit to output a ground voltage to the terminal when power is applied from an external power source.