Wiring Method for Checking Wirings of Organic Electroluminescent Display
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Solution Overview
Problem
Existing methods for power-on testing and aging of organic electroluminescent displays, particularly those using the Chip On Glass (COG) method, are unable to connect anodes and cathodes to a power supply without extending leads to the edges, making it difficult to test and age COG displays effectively.
Innovation Solution
A new wiring method where cathode and anode check lines are extended from the sides of organic electroluminescent displays, connecting to a power contact block, allowing for series or parallel connections without needing to extend leads from integrated circuit pins, enabling power-on testing and aging by cutting only the back cover over the power contact block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If leads of anodes and cathodes are extended to the edges of displays for power-on testing and aging, then connection to power supply is achieved, but this method cannot be applied to COG displays where leads cannot be extended
Solution Approach 1:
The check lines are segmented into two distinct types: anode check lines extending from anode ends and cathode check lines extending from cathode ends. This segmentation allows each type of check line to be independently routed to appropriate power contact blocks, enabling power supply connection for COG displays without extending leads from integrated circuit pins.
2Productivity
If the back cover is cut or hole is dug to expose anode and cathode for testing, then power-on testing and aging can be performed, but the process becomes complex and time-consuming
Solution Approach 1:
The check lines are pre-fabricated during the manufacturing process, extending from the display edges to the back cover. Power contact blocks are pre-positioned on the back cover at locations that will be exposed by minimal cutting. This preliminary preparation eliminates the need for complex post-assembly modifications and enables rapid power-on testing and aging.
3Productivity
If entire-sheet power-on testing and aging are performed on substrate glass containing multiple displays, then mass testing is achieved, but the back cover must be extensively cut or holes dug through
Solution Approach 1:
Multiple displays on the substrate glass share common power contact blocks through the main check lines. The anode check lines and cathode check lines from multiple displays are merged into shared power supply paths, allowing entire-sheet power-on testing and aging to be performed by exposing only the power contact block regions rather than individually accessing each display.
4Ease of manufacture
If check lines are fabricated separately, then wiring functionality is achieved, but additional fabrication costs are incurred
Solution Approach 1:
The check lines are merged with the existing transparent electrode layers (ITO or IZO) used for display operation. The same conductive material and deposition processes are used to create both the display electrodes and the check lines, eliminating separate fabrication steps and reducing material and manufacturing costs.
Data Source
AI summary
A wiring method for checking wirings of an organic electroluminescent display, in which a plurality of organic electroluminescent displays are arranged and encapsulated on a large piece of glass substrate, a power contact block with a main checking wiring is arranged at one side of the glass substrate, the cathode and the anode of the display which is at the centre are connected to said main checking wirings through an electrically conductive cathode checking wiring and an electrically conductive anode checking wiring, respectively. The main checking wirings connect the plurality of displays to the power contact block in series or parallel at a side of the glass substrate, wherein said cathode checking wiring may be connected to the cathode from any side of the display, then be wired and extended out, said anode checking wiring may be wired and extended out from other one side other than the anode end side which is connected to the integrate circuit for the display, and the anode checking wiring is only is connected to other end of the anode.