3D Display Panel Alignment Marks Between Substrates
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Solution Overview
Problem
In three-dimensional display devices, the alignment of panels is challenging due to the presence of protective materials like silicone resin, which can distort alignment marks and reduce the area available for alignment marks on glass substrates, leading to blurred images and difficulty in focusing, especially when a resin is applied on the glass substrate with a semiconductor chip.
Innovation Solution
A three-dimensional display device design where alignment marks are formed between the substrates of the image display panel and the parallax formation panel, avoiding overlap with protective materials and the picture-frame area, allowing for easy alignment without interference from protective materials and frame narrowing, using notches in black matrix layers and sealing materials that overlap with alignment marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective resin material is applied on the glass substrate with alignment marks, then the semiconductor chip is protected, but the alignment mark becomes distorted and difficult to recognize
Solution Approach 1:
The alignment mark is segmented into two parts: a first alignment mark formed on the glass substrate before resin application, and a second alignment mark formed on the resin surface after application. This segmentation allows the first mark to provide structural reference while the second mark provides visible alignment reference unaffected by resin distortion.
Solution Approach 2:
The second alignment mark formed on the resin surface acts as an intermediary between the distorted first alignment mark and the alignment process. This intermediate mark is not affected by resin irregularities and can be clearly recognized for precise panel alignment.
2Area of stationary object
If the peripheral area (picture-frame) of a display area is narrowed, then the display area is increased, but the area available for placing alignment marks is reduced
Solution Approach 1:
The alignment mark structure is extended into the vertical dimension by creating a two-layer system: the first alignment mark on the glass substrate and the second alignment mark on the resin surface. This dimensional extension allows alignment functionality to be preserved even when the horizontal picture-frame area is minimized.
3Measurement precision
If alignment marks are formed on glass substrates, then alignment can be performed, but the distance between alignment marks increases due to polarizer or adhesion layer, causing focus issues
Solution Approach 1:
The second alignment mark on the resin surface serves as a copy or projection of the first alignment mark's positional information, but presented in a form that is optically accessible and not affected by intervening layers. This copying eliminates focus issues while maintaining alignment accuracy.
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
Enables precise and easy alignment of panels, preventing distortion from protective materials and maintaining image clarity, even with narrowed picture-frames, by positioning alignment marks between substrates and using light-shielding or light-transmitting materials to ensure visibility.
Implementation Method 1
a sealing material that seals a space between the pair of substrates of the image display panel, and the sealing material of the image display panel may overlap with the notch formed in the black matrix layer
Implementation Method 2
the image display panel may be a liquid crystal display panel, and have the pair of substrates and a black matrix layer formed on one of the substrates, and a notch as the alignment mark may be formed at a portion of the black matrix layer
Data Source
AI summary
A three-dimensional display device includes an image display panel that has an alignment mark and a parallax formation panel that has an alignment mark and separates a left-eye image and a right-eye image displayed on the image display panel to enable autostereoscopic vision. At least one of the image display panel and the parallax formation panel has a pair of substrates placed on top of each other, and the alignment mark is formed between the pair of substrates.