Display Sensor Alignment via Protective Sheet Opening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in accurately attaching and verifying the position of sensors, such as fingerprint sensors, on the display panel while minimizing light interference and maintaining structural integrity.
Innovation Solution
A display device design featuring a protective sheet with an opening for the sensor, where a pattern made of the same material as the light blocking layer is formed on the display panel to align and inspect the sensor's position, including alignment marks and light blocking layers to prevent light penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensor is attached to the rear side of the display panel through an opening in the protective sheet, then the sensor can be installed for functionality (e.g., fingerprint sensing), but it becomes difficult to accurately verify the attachment position and ensure proper alignment
Solution Approach 1:
Alignment marks are formed on the display panel before sensor attachment. These marks serve as pre-prepared reference indicators that guide the precise positioning of the sensor during the attachment process, enabling accurate verification of the sensor's attachment position through the protective sheet opening
Solution Approach 2:
The alignment marks create a visual reference pattern that can be observed through the protective sheet opening. This allows the attachment position to be verified by comparing the sensor position with the marked reference pattern, effectively creating a copy of the ideal alignment position for verification purposes
2Strength
If the protective sheet is made opaque for protection, then mechanical strength and protection are improved, but light cannot pass through to allow sensor operation and position verification
Solution Approach 1:
The protective sheet is designed with a local opening in the region corresponding to the sensor. This creates a localized transparent area that allows light to pass through for sensor operation and position verification, while the rest of the protective sheet remains opaque to maintain its protective function and mechanical strength
Solution Approach 2:
The protective sheet is segmented into two functional regions: an opaque region for protection and a transparent opening region for sensor operation. This segmentation allows each region to fulfill its specific function - the opaque portion provides mechanical strength and protection, while the transparent opening allows light transmission for sensor functionality
3Manufacturing precision
If alignment marks are added to the display panel for precise sensor positioning, then attachment accuracy is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The alignment marks are formed using the same light blocking layer and manufacturing process that is already used for the display panel's pixel patterns. By merging the alignment mark formation with the existing pixel pattern formation process, no additional manufacturing steps are required, thus avoiding increased device complexity while achieving precise sensor positioning
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
Enhances the accuracy of sensor attachment, allows for easy verification of its position, and reduces light interference, thereby improving the overall performance and reliability of the display device.
Implementation Method 1
a light blocking layer between the substrate and the transistor. The pattern may be made of a same material as the light blocking layer
Data Source
AI summary
A display device includes a display panel, a protective sheet at a rear side of the display panel, the protective sheet including an opening, a sensor in the opening, and a pattern in the display panel, the pattern overlapping the opening.