Stretchable Display Panel Functional Pattern Elongation Measurement
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Solution Overview
Problem
Existing display panel manufacturing processes lack a precise method to measure the elongation rate during the bonding of flexible printed circuit boards and display panels, which affects the reliability of the final display device.
Innovation Solution
The display panel design includes a stretchable region with functional patterns arranged in a matrix form, featuring insulating and metal portions, and a conductive adhesive film for bonding with the flexible printed circuit board, allowing for precise measurement of elongation rates through capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a flexible printed circuit board is bonded to the display panel, then the display device can achieve reduced thickness and integrated driving circuits, but the elongation of the display panel during bonding cannot be precisely measured
Solution Approach 1:
The patent introduces a functional pattern as an intermediary element that mediates between the bonding process and measurement requirement. This functional pattern includes a capacitance sensor that indirectly measures elongation by detecting capacitance changes, rather than directly measuring physical dimension changes during bonding. The functional pattern serves as a mediator that converts mechanical deformation into electrical signals for precise measurement.
Solution Approach 2:
The patent replaces direct mechanical measurement methods with an electrical measurement system. Instead of using mechanical gauges or direct dimensional measurement to detect elongation, the invention uses a capacitance-based functional pattern that converts mechanical elongation into electrical capacitance changes. This substitution enables non-contact, high-precision measurement of the display panel elongation during the bonding process.
2Adaptability or versatility
If the display panel is made flexible to enable bonding with the flexible printed circuit board, then integration is improved, but the reliability is compromised due to unmeasured elongation
Solution Approach 1:
The patent implements a feedback mechanism where the capacitance sensor continuously monitors elongation during the bonding process. The measured capacitance changes provide real-time feedback about the display panel's deformation state, allowing for precise control and compensation of elongation effects. This feedback loop ensures that the flexible display panel maintains reliability by enabling accurate measurement and control of elongation throughout the bonding process.
3Ease of manufacture
If traditional bonding processes are used without elongation measurement, then manufacturing is simpler, but the reliability of the final product is reduced
Solution Approach 1:
The patent applies preliminary action by pre-forming the functional pattern with the capacitance sensor on the display panel before the bonding process begins. This pre-prepared measurement system is already in place to detect elongation during bonding, eliminating the need for complex post-bonding measurements or modifications. The preliminary placement of the functional pattern simplifies the overall manufacturing process while ensuring reliable elongation measurement.
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 approach enables precise measurement and consideration of elongation rates during manufacturing, enhancing the reliability and performance of the display device by accurately accounting for stretching during bonding.
Implementation Method 1
precise measurement of elongation rates through capacitance changes
Data Source
AI summary
A display device includes: a display panel divided into a non-display region including a stretchable region and a display region adjacent to the non-display region, and a flexible printed circuit board disposed to overlap the stretchable region and including circuit pads, where the display panel includes: display pads disposed to overlap the stretchable region and electrically connected to the circuit pads at least partially, and a functional pattern disposed to overlap the stretchable region, and spaced apart from the display pads in a plan view. The functional pattern includes an insulating portion, a first metal portion disposed on a first side surface of the insulating portion, and a second metal portion disposed on a second side surface of the insulating portion opposite to the first side surface.