Display Panel Test Pad Unit Disable Mechanism
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Solution Overview
Problem
Existing display panel technologies lack efficient mechanisms for disabling test pads after a test period, which can lead to increased component size, manufacturing costs, and reduced portability due to misalignment issues between test pads and flexible circuit boards.
Innovation Solution
A display panel design featuring a test pad unit with first pads for transmitting test signals and second pads for disabling the first pads, along with an auxiliary pad that ensures all pads are disabled by applying a common disable voltage, even in cases of misalignment, using a flexible circuit board with a lead terminal portion connected to the test pad unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If test pads are continuously enabled after test period, then ease of operation is improved, but power consumption increases and reliability decreases
Solution Approach 1:
The test pads are enabled only during the test period and automatically disabled afterward through periodic control signals. The disable voltage is applied after the test period to turn off the test pads, ensuring they operate only when needed and remain disabled during normal display operation.
2Ease of manufacture
If alignment tolerance between test pads and flexible circuit board is increased, then ease of manufacture is improved, but reliability of voltage application deteriorates
Solution Approach 1:
The auxiliary pad is预先 designed with an extended surface area in the second direction to compensate for potential misalignment. This preliminary structural preparation ensures that even if alignment varies during manufacturing, the disable voltage can still be reliably applied to the test pads through the auxiliary pad's extended contact area.
3Reliability
If auxiliary pad surface area is extended, then reliability of voltage application is improved, but area of stationary object increases
Solution Approach 1:
The auxiliary pad's surface area is selectively extended only in the second direction (alignment direction) where misalignment compensation is needed, while maintaining compact dimensions in other directions. This localized extension provides the necessary reliability improvement with minimal increase in overall pad unit area.
Data Source
AI summary
A display panel includes a display unit including a plurality of pixels, and a test pad unit having a plurality of pads configured to transmit a test signal to the display unit during a test period, the plurality of pads being disabled after the test period is completed, the test pad unit including a plurality of first pads that transmit the test signal, applied from outside during the test period, to the display unit, and a plurality of second pads and an auxiliary pad that disable the plurality of first pads when the test period is completed.