OLED Panel Terminal Protection Layout Against Static Electricity
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Solution Overview
Problem
In OLED panels, the proximity of panel terminals to circuits under the semiconductor chip makes them susceptible to static electricity during the mounting process, potentially damaging the transistors.
Innovation Solution
A display device with a semiconductor chip mounted in a frame region around the display panel, featuring a staggered arrangement of peripheral circuits (diode connection protection and panel inspection circuits) corresponding to panel terminals, which are positioned to protect and inspect pixels before the chip is mounted, ensuring uniform protection resistance against static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If circuits are disposed under the semiconductor chip to narrow the frame region, then the frame region is reduced and device integration is improved, but the distance between panel terminals and circuits becomes short making circuits susceptible to static electricity damage
Solution Approach 1:
The patent divides the circuits into two functional groups: protection circuits (diode connections) positioned close to panel terminals to intercept static electricity, and inspection/load circuits positioned farther away. This segmentation allows the protection circuits to handle the static electricity threat while the main circuits remain protected, resolving the contradiction between compact layout and static electricity susceptibility.
Solution Approach 2:
The patent introduces protection circuits as intermediary elements between the panel terminals and the main circuits. These protection circuits act as a buffer that intercepts static electricity before it reaches the vulnerable transistors in the inspection and load circuits, enabling the circuits to be positioned closer to terminals without increasing damage risk.
2Reliability
If protection circuits are added between panel terminals and main circuits, then static electricity protection is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent merges the protection circuit functionality with the existing circuit architecture by using diode connections that are integrated into the same pixel structure. The protection circuits share power supply lines and structural elements with the main circuits, reducing the overall complexity increase despite adding protection functionality.
Solution Approach 2:
The protection circuits are designed to serve multiple functions: they protect against static electricity, maintain normal pixel operation during display mode, and enable inspection operations. This multi-functionality reduces the need for separate dedicated protection structures, thereby limiting the increase in device complexity.
3Reliability
If diode connections are used for protection circuits, then static electricity protection effectiveness is improved, but manufacturing precision requirements increase due to reverse connection risks
Solution Approach 1:
The patent connects both the anode and cathode of each protection diode to power supply lines (ELVDD or ELVSS) that maintain stable potentials. This equipotential connection approach ensures that even if the diode orientation varies slightly during manufacturing, the protection function remains effective because the diode operates within a controlled potential difference range.
Data Source
AI summary
A display device (1) includes a semiconductor chip (2) and a video protection circuit (3) mounted in a frame region (8) of a display panel (6), the display panel (6) includes a plurality of panel terminals (14R, 14G, and 14B) arranged in accordance with a staggered arrangement, and the video protection circuit (3) includes a plurality of diode connection protection circuits (15R, 15G, and 15B) arranged in accordance with a staggered arrangement to correspond to the plurality of panel terminals (14R, 14G, and 14B), respectively.