Display Device Measurement Pad for Bonding Interval Detection
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Solution Overview
Problem
Existing display devices face challenges in easily measuring the bonding intervals between pads and chip pads, which affects the electrical connection characteristics and the overall performance of the display device.
Innovation Solution
A display device configuration that includes a substrate with a pixel and a first measurement pad, where the first measurement pad has a first electrode, a second electrode separated from the first electrode by an insulating layer, and a first chip pad disposed on the insulating layer, allowing for the measurement of bonding intervals without damaging the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical cutting is used to measure bonding intervals, then measurement accuracy is improved, but device damage occurs and productivity decreases
Solution Approach 1:
The patent replaces the mechanical cutting method with an electrical measurement method. Instead of physically cutting the display panel to measure bonding intervals, the invention uses a measurement pad with electrodes that apply voltage and measure electrical properties (capacitance, impedance, or resistance) to non-destructively determine the bonding interval between pads and chip pads.
Solution Approach 2:
The patent introduces a measurement pad as an intermediary component. This measurement pad includes a first electrode on the substrate, a second electrode on an insulating layer, and a first chip pad on the insulating layer, forming a capacitor that serves as a mediator to indirectly measure the bonding interval through electrical characteristics without direct physical contact or damage to the bonding interface.
2Adaptability or versatility
If measurement pads are electrically connected to pixels, then device functionality is improved, but measurement reliability deteriorates due to interference
Solution Approach 1:
The patent segments the pads into two distinct functional groups: measurement pads that are electrically isolated from pixels and dedicated solely to measurement functions, and pixel-connected pads that maintain electrical connection to pixels for display functionality. This segmentation prevents measurement interference while preserving device functionality.
Solution Approach 2:
The patent extracts the measurement function from the pixel circuit system by creating separate measurement pads that are not electrically connected to pixels. The measurement pad forms an independent capacitor structure that can be measured without affecting or being affected by pixel operations, thereby eliminating measurement interference.
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 configuration enables easy measurement of bonding intervals between pads and chip pads, improving the electrical connection characteristics and allowing for more accurate prediction of bonding intervals in all display panels without the need for physical cutting.
Implementation Method 1
an insulating layer disposed between the first electrode and the second electrode
Implementation Method 2
a first measurement pad disposed on the substrate, and including a first electrode disposed on the substrate, a second electrode disposed on the first electrode, and electrically separated from the first electrode
Data Source
AI summary
A display device includes: a substrate, a pixel disposed on the substrate, and a first measurement pad disposed on the substrate. The first measurement pad includes: a first electrode disposed on the substrate, a second electrode disposed on the first electrode, and electrically separated from the first electrode, and an insulating layer disposed between the first electrode and the second electrode.