OLED Display Static Electricity Protection via Sacrificial Diodes
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Solution Overview
Problem
Conventional OLED displays are susceptible to breakage of the insulation layer due to external static electricity at the intersections of gate wires and data wires, leading to potential short-circuits.
Innovation Solution
Incorporating data leading diodes and gate leading diodes with island forms, connected to the respective wires, which are designed to break the first insulation layer when external static electricity is applied, thereby preventing the breakdown of the second insulation layer and minimizing short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a conventional OLED display structure with gate wires and data wires crossing is used, then the display device achieves thinness and flexibility, but the insulation layer is susceptible to breakage by static electricity at wire intersections
Solution Approach 1:
The patent introduces leading diodes (data leading diodes and gate leading diodes) that are pre-configured at strategic positions along the data wires and gate wires. These leading diodes are designed to break down first when static electricity strikes, creating a protective mechanism before the static electricity can reach and damage the insulation layer at wire intersections. This preliminary protective action prevents the harmful effects of static electricity from reaching critical components.
Solution Approach 2:
The leading diodes serve as intermediary protective elements between the external static electricity and the insulation layer. When static electricity enters through the data wires or gate wires, the leading diodes act as sacrificial components that absorb and dissipate the electrical energy before it can reach the insulation layer, thereby protecting the overall display structure while maintaining the thin-film design.
2Length of moving object
If the insulation layer is made thinner to reduce device thickness, then flexibility and thinness are improved, but the insulation layer becomes more vulnerable to static electricity breakdown
Solution Approach 1:
The leading diodes are positioned upstream along the wire paths to intercept static electricity before it reaches the thinner insulation layer. By breaking down first, they prevent high-voltage static electricity from acting on the reduced-thickness insulation layer, effectively compensating for the reduced protective capability of the thinner insulation.
Solution Approach 2:
The leading diodes function as intermediary protective components that stand between the external static electricity source and the vulnerable thin insulation layer. They absorb the electrical stress that would otherwise directly impact the thinned insulation layer, enabling the use of thinner insulation without proportionally increasing vulnerability to static electricity damage.
3Reliability
If leading diodes are added to protect against static electricity, then reliability is improved, but device complexity increases
Solution Approach 1:
The leading diodes are integrated into the existing wire structures by being formed on the same substrates and insulating layers as the gate wires and data wires. The data leading diodes are connected to data wires and the gate leading diodes are connected to gate wires, merging the protective function with the existing conductive pathways without requiring separate protective structures.
Solution Approach 2:
The leading diodes serve multiple functions: they act as electrical conduits for normal operation and as protective elements against static electricity. By incorporating these components into the existing wire architecture, the patent achieves short-circuit prevention without adding substantial structural complexity, as the same components serve both signal transmission and protection roles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively protects the second insulation layer from static electricity-induced breakdown, preventing short-circuits between gate and data wires, thus enhancing the reliability and durability of the OLED display.
Implementation Method 1
data leading diodes being configured to induce breakage of the first insulation layer when external static electricity passes through the data wires
Implementation Method 2
induce breakage of the first insulation layer when external static electricity passes through the data wires
Data Source
AI summary
A display device includes a first insulation layer on a substrate, gate wires on the first insulation layer, the gate wires extending in a first direction, a second insulation layer on the gate wires, data wires on the second insulation layer, the data wires extending in a second direction crossing the first direction, pixels at intersection regions of gate wires and data wires, respectively, the pixels being connected to respective gate wires and data wires, and data leading diodes having an island form and connected to the data wires, the data leading diodes being configured to induce breakage of the first insulation layer when external static electricity passes through the data wires.