Display Panel Alignment Stage With Dual-Thickness Mark Imaging
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Solution Overview
Problem
The existing panel alignment devices for display devices face challenges in accurately recognizing alignment marks due to differing distances between the vision camera and the panel and the driving chip, which lowers the recognition rate and increases alignment time.
Innovation Solution
A panel alignment device with a stage that includes a transmitting portion with varying thickness regions, allowing the vision camera to capture alignment marks through specific regions, and a controller that adjusts the position of the stage and head based on captured image information to align the panel and driving chip accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vision camera is used to capture alignment marks of both the panel and the driving chip, then alignment can be achieved, but the recognition rate of alignment marks is lowered due to different distances between the camera and the objects
Solution Approach 1:
The stage is designed with different thickness regions (first region with first thickness, second region with second thickness greater than the first thickness) to compensate for the different distances between the vision camera and the alignment marks. This local variation in thickness creates different optical path lengths that equalize the effective distance, allowing the vision camera to capture both alignment marks with comparable clarity and recognition rate.
Solution Approach 2:
The stage with varying thickness acts as an intermediary optical element between the vision camera and the alignment marks. By introducing this intermediate structure with controlled thickness variations, the system compensates for the inherent distance differences without requiring multiple cameras or complex mechanical adjustments.
2Measurement precision
If the stage has uniform thickness, then the structure is simple, but the vision camera cannot accurately capture alignment marks at different distances
Solution Approach 1:
The stage transitions from a uniform thickness design to a local quality design where different regions have different thicknesses. The first region has a first thickness and the second region has a second thickness greater than the first thickness, creating localized optical path adjustments that improve alignment mark capture accuracy without requiring a complete redesign of the entire stage structure.
3Reliability
If the alignment process uses a single vision camera position, then the device structure is simple, but the recognition rate decreases due to varying distances to different alignment marks
Solution Approach 1:
The varying thickness regions of the stage serve as an intermediary optical compensator that equalizes the effective distance from the vision camera to alignment marks at different physical locations. This allows a single fixed-position camera to achieve reliable recognition of both alignment marks by compensating for the distance difference through optical path length adjustment.
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 solution improves the recognition rate of alignment marks and reduces alignment time by compensating for distance differences through the use of varying thickness regions in the transmitting portion and precise movement control of the stage and head.
Implementation Method 1
a transmitting portion that includes a first region having a first thickness and a second region having a second thickness greater than the first thickness
Data Source
AI summary
A panel alignment device for a display device includes a stage supporting a panel and including a transmitting portion that includes a first region having a first thickness and a second region having a second thickness greater than the first thickness, a head disposed over the stage and supporting a driving chip, a vision camera which is disposed under the stage, captures a first alignment mark of the panel through the first region, and captures a second alignment mark of the driving chip through the second region, and a controller which controls at least one of a movement and a rotation of each of the stage and the head based on first image information related to a position of the first alignment mark and second image information related to a position of the second alignment mark.