OLED Common Electrode Pad Charge Discharge Path
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Solution Overview
Problem
During the manufacturing process of OLED displays, charge accumulation on the common electrode can lead to potential differences and surface peeling issues, affecting the display's quality and performance.
Innovation Solution
The solution involves forming a display device with a common electrode pad and a driving voltage line pad on a substrate, where connectors are used to electrically connect the common electrode pad to the gate line shorting bar, data line shorting bar, and driving voltage line pad, allowing charge movement to another connection channel, and optionally incorporating a discharge member to discharge charges to an outer space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common electrode is formed in OLED display during manufacturing, then the display structure is completed and light emission function is achieved, but charge accumulation occurs on the common electrode causing potential differences and surface peeling
Solution Approach 1:
The patent extracts the harmful charge accumulation from the common electrode by creating alternative charge discharge paths. Connectors are formed between the common electrode pad and ground potential areas, allowing charges to be removed from the common electrode and discharged to external ground, thereby eliminating the harmful effect of charge accumulation while maintaining the common electrode's light emission function
Solution Approach 2:
The patent introduces connectors as intermediary elements between the common electrode pad and ground potential areas. These connectors serve as charge transfer pathways, mediating the removal of charges from the common electrode system. The connectors enable charge flow without requiring direct modification of the common electrode structure itself, thus protecting the display quality while resolving the charge accumulation issue
2Object-generated harmful factors
If additional connectors and discharge members are added to prevent charge accumulation, then charge discharge capability is improved, but device structure becomes more complex
Solution Approach 1:
The patent merges the charge discharge function with existing structural elements. Connectors are integrated into the manufacturing process alongside other display components, and discharge members are positioned to utilize existing ground potential areas. This combining approach allows charge discharge capability to be added without proportionally increasing overall device complexity, as the new elements are merged with the existing structural framework
Solution Approach 2:
The connectors serve multiple functions: they provide charge discharge pathways, maintain electrical connections during manufacturing, and can serve as structural support elements. By making the connectors multi-functional, the patent reduces the need for separate dedicated discharge structures, thereby limiting the increase in device complexity while still achieving effective charge management
Data Source
AI summary
A display device and a method of manufacturing the display device are provided. The display device includes a substrate; a driving voltage line disposed on the substrate; a driving voltage line pad to transmit a driving voltage to the driving voltage line; a driving transistor connected to the driving voltage line; a pixel electrode connected to the driving transistor; a common electrode opposing the pixel electrode; a light emitting member disposed between the pixel electrode and the common electrode; and a common electrode pad disposed on the substrate so as to transmit a common voltage to the common electrode. The common electrode pad and the driving voltage line pad are exposed at a side surface of the substrate.