Display Panel Edge Detection via Optical Film Contrast
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Solution Overview
Problem
The difficulty in monitoring the encapsulation effect of a display module due to the encapsulant covering the edge, making it challenging to determine whether the encapsulant is qualified, as the gray scales on both sides of the edge are close and difficult to distinguish using Automated Optical Inspection (AOI) technology.
Innovation Solution
Incorporating an optical film on the back surface and/or sidewall of the display module, which causes a difference in light reflection intensity, enhancing the contrast and allowing accurate recognition of the edge for effective encapsulant monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulant is provided at the edge of the display module to encapsulate and protect the display module, then reliability is improved, but the encapsulant covers the edge making it difficult to recognize and monitor encapsulation quality
Solution Approach 1:
The patent applies a reference mark with a specific gray scale value (different from both the display module body and encapsulant) at the edge position. This creates visual contrast that enables AOI equipment to distinguish the edge location and monitor encapsulant width and coverage, solving the recognition difficulty while maintaining encapsulation protection.
Solution Approach 2:
The reference mark serves as an intermediary element between the display module body and the encapsulant. It provides a detectable signal that helps AOI equipment identify the edge position and measure encapsulant dimensions without interfering with the encapsulation's protective function.
2Extent of automation
If AOI technology is used to monitor encapsulation effect, then automation is improved, but the similar gray scales on both sides of the edge make detection inaccurate
Solution Approach 1:
By introducing a reference mark with a distinct gray scale value at the edge position, the patent creates a detectable contrast signal that enables AOI equipment to accurately identify edge locations and measure encapsulant dimensions, thereby improving measurement precision while maintaining automated detection.
Solution Approach 2:
The patent changes the gray scale parameter of the reference mark to be different from both the display module body and encapsulant. This parameter modification creates a detectable signal that enhances AOI equipment's ability to precisely locate edges and measure encapsulation quality.
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 optical film improves the contrast between the back surface and sidewall, enabling accurate positioning of the edge and determining the encapsulant's quality, ensuring effective protection against external water vapor and grease.
Implementation Method 1
the optical film causes a light reflection intensity at the back surface of the display module to be different from a light reflection intensity at the sidewall of the display module
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a cover plate and a display module; the cover plate is located on a light-exiting side of the display module; an optical film is provided on a back surface of the display module and/or a sidewall of the display module; an encapsulant is provided at an edge of the display module to encapsulate the edge of the display module with the cover plate. The optical film causes a light reflection intensity at the back surface of the display module to be different from a light reflection intensity at the sidewall of the display module.