Display Scan Driver Shielding for Oxide Transistor Voltage Stability
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Solution Overview
Problem
Display devices face challenges in preventing threshold voltage shifts in antistatic and lighting circuits, particularly due to the lack of effective protection for oxide-based transistors.
Innovation Solution
Incorporating a shielding layer integral to the driving voltage line that overlaps the antistatic circuit and a DC electrode that overlaps the test transistor, both of which are oxide-based, to prevent threshold voltage shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding layer is added to protect the antistatic circuit, then the threshold voltage stability is improved, but the device complexity increases
Solution Approach 1:
The shielding layer is integrated with the driving voltage line to form a unified structure. The driving voltage line serves dual purposes: providing electrical connection and functioning as a shielding layer to protect the antistatic circuit from external electromagnetic interference, thereby preventing threshold voltage shifts without adding separate protective structures
Solution Approach 2:
The driving voltage line is designed to perform multiple functions simultaneously: it provides electrical power transmission and acts as an electromagnetic shielding layer. This multi-functional design eliminates the need for additional dedicated shielding structures, reducing overall device complexity while maintaining protection effectiveness
2Reliability
If the shielding layer is made continuous, then the protection effectiveness is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The shielding layer is designed with holes at specific positions rather than being completely continuous. These holes are strategically placed to avoid overlapping with transistor semiconductor regions, allowing the shielding layer to maintain protection effectiveness over critical areas while reducing manufacturing complexity and relaxing precision requirements
3Productivity
If the oxide-based transistor is used in the antistatic circuit, then the circuit performance is improved, but the threshold voltage shift occurs more easily
Solution Approach 1:
The shielding layer is positioned to preemptively block external electromagnetic interference before it can reach the oxide-based transistor in the antistatic circuit. This preliminary protective action prevents the accumulation of charges that would cause threshold voltage shifts, allowing the high-performance oxide-based transistor to operate stably
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 shielding layer effectively protects the antistatic and test transistors from voltage shifts, enhancing the stability and performance of the display device.
Implementation Method 1
a shielding layer integral to the driving voltage line to overlap the top of the antistatic circuit
Data Source
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AI summary
A display device comprises a display area comprising a plurality of pixels, and a data line and a gate line electrically connected to the plurality of pixels, a non-display area disposed adjacent to the display area, a plurality of pads disposed on a side of the non-display area, a gate control line electrically connected to at least one of the plurality of pads and that supplies a gate control signal, a driving voltage line electrically connected to at least one of the plurality of pads and that supplies a driving voltage, an antistatic circuit electrically connected to the gate control line, a scan driver that generates a gate signal based on a gate control signal received from the gate control line and that supplies the gate signal to the gate line, and a shielding layer integral to the driving voltage line to overlap the top of the antistatic circuit.