Gate Driver Contact Pad Sharing for Static Discharge
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Solution Overview
Problem
Conventional gate driving apparatuses for LCDs suffer from substantial static electricity accumulation, which degrades the performance of display devices due to electric charges accumulating in or near source, drain, gate lines, or gate insulating films when using amorphous silicon TFTs.
Innovation Solution
A gate driving apparatus with a plurality of stages, each stage including first and second output lines, where the first output lines transmit gate signals to pixels and the second output line transmits signals to preceding stages, sharing a contact pad, and incorporating a pull-up unit, pull-down unit, and storage voltage line to manage gate signals and reduce static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If amorphous silicon TFTs are used to build the gate driver directly on the glass substrate, then the device complexity and manufacturing cost are reduced, but substantial amounts of electric charges accumulate in or near source or drain lines, gate lines, or gate insulating films, generating static electricity that degrades display device performance
Solution Approach 1:
The patent extracts and removes accumulated electric charges from the gate driving apparatus by introducing a discharge path through the pull-down unit. This allows static electricity that would otherwise accumulate in the gate lines, source/drain lines, or gate insulating films to be discharged, thereby resolving the harmful effect while maintaining the integrated gate driver structure on the glass substrate.
Solution Approach 2:
The patent introduces a storage voltage line as an intermediary element between the pull-up unit and the contact pad. This storage voltage line serves as a mediator to manage and control the flow of electric charges, enabling the system to handle static electricity accumulation by providing a controlled discharge path through the pull-down unit without disrupting the overall gate driving function.
2Ease of manufacture
If multiple amorphous silicon TFTs are disposed in the gate driver, then the gate driving apparatus can be integrated directly on the glass substrate, but electric charges accumulate in source or drain lines and gate insulating films, generating static electricity
Solution Approach 1:
The patent introduces dynamic charge management to the previously static gate driver structure by implementing a pull-up unit and pull-down unit that can actively control and adjust electric charge levels. This dynamic system allows the gate driver to adaptively manage static electricity generation by discharging accumulated charges through the pull-down unit, thereby maintaining the manufacturing simplicity of direct integration while eliminating the harmful static electricity effect.
Solution Approach 2:
The patent changes the electrical parameters of the gate driver by introducing variable voltage control through the pull-up and pull-down units. By dynamically adjusting the voltage levels and charge states in the gate lines and source/drain lines, the system can prevent and discharge static electricity accumulation, thereby resolving the contradiction between easy manufacturing integration and static electricity generation.
3Quantity of substance
If the gate driver is integrated directly on the glass substrate using amorphous silicon TFTs, then manufacturing cost and product size are reduced, but performance of the display device is substantially degraded due to static electricity
Solution Approach 1:
The patent converts the harmful effect of static electricity accumulation into a beneficial outcome by implementing a discharge mechanism. The pull-down unit is specifically designed to detect and discharge accumulated electric charges from the gate lines and source/drain lines, thereby transforming the potential harm of static electricity into a protective function that maintains display device performance while preserving the compact integrated structure.
Solution Approach 2:
The storage voltage line acts as an intermediary that mediates between the charge-generating components (amorphous silicon TFTs in source/drain lines) and the discharge path (pull-down unit). This intermediary structure allows for controlled management of electric charges, enabling the compact integrated design to maintain high reliability by preventing static electricity from degrading display device performance.
Data Source
AI summary
Provided are a gate driving apparatus and a display device including the same. The gate driving apparatus includes a plurality of stages arranged sequentially, each stage is adapted to output a gate signal and including first output lines and a second output line, wherein the first output lines are electrically connected to a gate line corresponding to each of the stages and are adapted to transmit the gate signal to a plurality of pixels coupled to the gate line, the second output line is adapted to transmit the gate signal to a preceding stage of each of the stages, and the first output lines and the second output line share one contact pad.