Dummy Pad Protrusion for Static Electricity Protection in Array Substrates
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Solution Overview
Problem
In display apparatuses with a chip-on-glass (COG) type mount, the power source line on the array substrate experiences a high voltage drop, leading to potential damage from static electricity, which can flow through data and gate lines and harm the electrostatic diode, thereby affecting the display area.
Innovation Solution
The implementation of an array substrate with dummy pads and driving signal output lines, where the dummy pads have protrusions that induce static electricity into electrostatic capacitors, preventing it from reaching the switching elements and thus protecting the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power source line width is increased to decrease voltage drop, then voltage stability is improved, but static electricity damage risk increases
Solution Approach 1:
An electrostatic capacitor is introduced as an intermediary component between the power source line and the data/gate lines. This capacitor acts as a mediator that captures and stores static electricity charges, preventing them from propagating to sensitive circuits while allowing the power source line to maintain its necessary width for voltage stability.
Solution Approach 2:
The electrostatic capacitor converts the harmful static electricity into a beneficial storage function. By designing the capacitor to be electrically connected to the power source line, the static electricity that would otherwise damage circuits is captured and stored, transforming a harmful effect into a protective mechanism.
2Area of stationary object
If the power source line is disposed between input and output bumps of the chip, then space utilization is improved, but electrostatic diode damage risk increases
Solution Approach 1:
The electrostatic capacitor serves as a protective intermediary positioned in the peripheral area of the array substrate. It intercepts static electricity from the power source line before it can reach the electrostatic diode, enabling the power source line to be optimally positioned between chip bumps for space efficiency while protecting sensitive components.
3Reliability
If dummy pads with protrusions are added to induce static electricity, then protection capability is improved, but device complexity increases
Solution Approach 1:
The dummy pad is segmented with a protrusion portion that extends toward the driving signal output line. This segmentation creates a specific geometric feature that enhances the pad's ability to induce and capture static electricity, improving protection capability while maintaining a relatively simple overall structure.
Solution Approach 2:
The protrusion portion of the dummy pad creates a localized region with enhanced electrostatic induction properties. By concentrating the protective function in this specific local area rather than modifying the entire pad structure, the design achieves improved protection with minimal increase in overall device complexity.
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
This solution effectively reduces the risk of damage to switching elements by redirecting static electricity into capacitors, ensuring stable operation and image display by minimizing voltage drops and protecting the electrostatic diodes.
Implementation Method 1
the dummy pad and a driving signal output line, wherein the dummy pad includes a first protrusion portion protruding from an end portion of the dummy pad along the first direction
Data Source
AI summary
An array substrate includes a substrate, a dummy pad and a driving signal output line. The substrate includes a display area displaying an image, and a peripheral area surrounding the display area. The dummy pad extends along a first direction in the peripheral area of the substrate, and includes a first protrusion portion protruding from an end portion of the dummy pad along the first direction. The driving signal output line extends along a second direction crossing with the first direction, is disposed adjacent to the dummy pad, and provides an external signal. Accordingly static electricity provided to the driving signal output line flows into the dummy pad having the first protrusion portion, so that static electricity may be prevented from flowing into the display area.