3D Display Panel Alignment Using Color Pattern Verification
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Solution Overview
Problem
Conventional three-dimensional display devices using liquid crystal parallax barrier panels face challenges in achieving accurate alignment between the liquid crystal display panel and the parallax barrier panel, leading to image quality degradation due to alignment errors, increased costs from the need for multiple cameras, and a larger display region to accommodate alignment mark blurring, which results in a larger picture frame and higher manufacturing costs.
Innovation Solution
A method for aligning a liquid crystal display panel with a liquid crystal parallax barrier panel using a single alignment mark and a single camera, where the alignment is refined using a white pattern with specific color and width relationships to eliminate θ shift and displacement errors, allowing for precise bonding without traditional alignment marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alignment marks are used to align the liquid crystal display panel with the parallax barrier panel, then alignment can be achieved, but alignment accuracy is insufficient leading to θ shift and displacement errors
Solution Approach 1:
The patent uses color patterns (white, black, blue) in the alignment mark that change appearance based on viewing angle and distance. By observing the color changes and tilt of the pattern when bringing eyes close to the screen, the system can detect and correct alignment errors in the lateral direction and θ direction, achieving sub-pixel level alignment accuracy.
Solution Approach 2:
The patent adds a new dimension to alignment verification by requiring the observer to bring their eyes close to the screen to observe the alignment mark pattern. This close-up observation dimension allows detection of θ shift and lateral displacement that cannot be detected by conventional distance-based alignment methods.
2Measurement precision
If the display region is made larger to accommodate alignment mark blurring, then alignment mark visibility is improved, but the picture frame becomes larger and manufacturing costs increase
Solution Approach 1:
The patent performs alignment verification at the actual observation distance (close to the screen) before final bonding. By using the color pattern alignment mark that can be clearly observed when eyes are brought close, the system achieves accurate alignment without needing to enlarge the display region to accommodate blurring at distance.
3Manufacturing precision
If multiple cameras are used to achieve accurate alignment, then alignment accuracy is improved, but manufacturing costs and device complexity increase
Solution Approach 1:
The patent uses a single camera to capture the alignment mark pattern, and the system automatically analyzes the color changes and tilt of the pattern to determine alignment errors. The alignment mark itself provides the verification information needed, eliminating the need for multiple cameras or complex external verification systems.
4Ease of manufacture
If traditional alignment marks are used, then alignment process is simple, but alignment accuracy is insufficient leading to image quality degradation
Solution Approach 1:
The patent uses a color pattern alignment mark (white center, black or blue outer ring) that changes appearance based on viewing angle and distance. This color-based approach maintains the simplicity of using an alignment mark while providing additional information (color tilt, pattern distortion) that enables sub-pixel level alignment accuracy through optical observation.
Data Source
AI summary
In a three-dimensional image display device using a liquid crystal parallax barrier panel, a liquid crystal display panel is first roughly aligned with the liquid crystal parallax barrier panel using an alignment mark. Subsequently, a white pattern for two pixels is formed in the center of a screen. When an observer's eyes are brought close to the screen, a blue pattern is generated in the center, and a white pattern is generated on both sides of the blue pattern. The relationship between a width d1 of the blue pattern and a width d2 of the white pattern is d1=2d2, and the tilt of the blue pattern is set in a predetermined range, so that necessary alignment accuracy can be secured.