Stereoscopic Display Substrate Alignment and Brightness Uniformity
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Solution Overview
Problem
Conventional liquid crystal display devices for stereoscopic image display suffer from image quality deterioration due to displacement between joined transparent substrates, leading to brightness variations and reduced opening ratios, especially when the light-shielding widths are enlarged.
Innovation Solution
The proposed image display device features a matrix arrangement of unit pixels with first- and second-viewpoint pixels, where the substrates are designed such that light-shielding areas have edge sections facing each other, defined by aperture areas, to maintain optimal brightness distribution even with substrate displacement, and employs optical path distribution units like cylindrical lenses or parallax barriers to direct light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-shielding widths are enlarged to improve image quality, then brightness uniformity improves, but opening ratio decreases
Solution Approach 1:
The light-shielding areas are segmented into multiple sections arranged in a matrix pattern, with each section having edge portions that face corresponding sections on the opposite substrate. This segmentation allows the light-shielding function to be distributed across multiple smaller elements rather than requiring a single large light-shielding width, thereby maintaining brightness uniformity while preserving a higher opening ratio.
Solution Approach 2:
The light-shielding areas are designed with specific asymmetric configurations where edge sections face each other across the substrate gap, creating optimized light distribution patterns. This asymmetric arrangement allows for improved brightness uniformity without requiring symmetric enlargement of light-shielding widths that would reduce the opening ratio.
2Ease of manufacture
If substrates are joined with displacement, then manufacturing ease improves, but image quality deteriorates due to brightness variations
Solution Approach 1:
The light-shielding areas are pre-configured with facing edge sections that create a compensatory effect. When substrate displacement occurs during manufacturing, the specific geometric arrangement of these edge portions naturally compensates for the misalignment, maintaining brightness uniformity despite the displacement. This beforehand cushioning design allows easier substrate joining without compromising image quality.
Solution Approach 2:
The design changes the geometric parameters of the light-shielding areas, specifically configuring the edge sections to face each other at specific orientations. This parameter change creates a system where brightness uniformity becomes less sensitive to substrate displacement, allowing for easier manufacturing while maintaining image quality.
3Adaptability or versatility
If parallax barrier is used for glassless stereoscopic display, then stereoscopic image perception improves, but viewable area and brightness are reduced
Solution Approach 1:
The patent transitions from a conventional single-substrate parallax barrier approach to a multi-dimensional configuration with multiple substrates having light-shielding areas arranged in specific three-dimensional spatial relationships. The facing edge sections of light-shielding areas create additional spatial dimensions for light control, enabling stereoscopic display while improving viewable area and brightness compared to traditional approaches.
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
This configuration ensures consistent brightness across the display, preventing image quality deterioration from substrate displacement and allowing for a high opening ratio without increasing light-shielding widths, while also enabling cost-effective manufacturing with parallax barriers.
Implementation Method 1
an optical path distribution unit arranged on the second substrate... distributes the light which has passed through the first-viewpoint pixel and the light which has passed through the second-viewpoint pixel in different directions
Implementation Method 2
each of the first-viewpoint pixel and the second-viewpoint pixel transmits light, which has passed though one of the first aperture areas, through the optical element and emits the light through one of the second aperture areas
Data Source
AI summary
An image display device includes a first substrate on which first aperture areas are formed, a second substrate on which second aperture areas are formed, an optical element, a plurality of unit pixels each including a first-viewpoint pixel for displaying an image for a first viewpoint and a second-viewpoint pixel for displaying an image for a second viewpoint, an optical path distribution unit, and a plurality of light-shielding areas including edge sections facing each other in a first direction, one of the edge sections being defined by one of the first aperture areas, the other of the edge sections being defined by one of the second aperture areas, and the one of the edge sections and the other of the edge sections being parallel, under a condition that the first substrate and the second substrate are joined together with positions thereof in the first direction being aligned.