One Sheet Test Device Panel Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the testing of organic light emitting displays formed on a one sheet substrate, lighting failures and short circuits in common wires complicate accurate testing of individual panels, as they affect current characteristics and prevent proper current flow to test devices.
Innovation Solution
A one sheet test device with first and second wires arranged in different directions, voltage application units, and a test unit that measures on-current and off-current of each panel by applying selected voltages and controlling switches to isolate and measure current after stabilization, ensuring accurate testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common wire is used to supply signals to multiple panels on one sheet substrate, then the device complexity is reduced, but measurement precision deteriorates due to current characteristic interference from lighting failures and short circuits
Solution Approach 1:
The patent divides the common wire into multiple independent wire segments, each dedicated to a specific panel. This segmentation isolates the current path for each panel, preventing current characteristic interference from affecting other panels during testing, thereby resolving the contradiction between device complexity and measurement precision
Solution Approach 2:
The patent introduces switching elements as intermediaries between the voltage application unit and individual panels. These switches enable selective connection of each panel to the voltage source, allowing independent testing without requiring a completely separate wiring system for each panel, thus maintaining reasonable device complexity while achieving precise measurement
2Productivity
If panels are tested while in one sheet substrate state using common wires, then productivity is improved by testing multiple panels simultaneously, but measurement precision deteriorates due to mutual interference between panels
Solution Approach 1:
The patent employs dynamic switching control to enable selective activation of individual panels or groups of panels during testing. The switching elements can be controlled to connect or disconnect specific panels from the voltage source, allowing the system to adapt between testing multiple panels simultaneously or individually based on test requirements, thus resolving the contradiction between productivity and measurement precision
Data Source
AI summary
A one sheet test device and a method of testing using the same that can prevent a change of current characteristics due to a failure panel by measuring a current of normal panels except for the failure panel, when testing a one sheet substrate that includes panels, first wires that are arranged in a first direction between and connected to the panels, second wires that are arranged in a second direction different from the first direction between and connected to the panels. The test device includes voltage application units that are connected to the first and second wires, respectively, to apply a selected one of the first voltage and the second voltage to the corresponding wires; and a test unit that controls the voltage application units to measure an on-current and off-current of each of the panels.