Patterned Retarder Alignment for 3D Display Crosstalk
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Solution Overview
Problem
Existing image display devices using the glasses type method for 3D image display suffer from degraded visibility and luminance issues due to crosstalk and moiré patterns, especially when viewing 2D images, and the use of black stripes to improve 3D visibility leads to reduced luminance and visibility of 2D images.
Innovation Solution
An image display device with a patterned retarder comprising alternating first and second retarders aligned to divide 3D images into polarization components, positioned at the center of pixels on odd or even horizontal lines, eliminating the need for separate black stripe patterns, which enhances 3D visibility without compromising 2D image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If black stripes are formed in patterned retarder regions to improve 3D image visibility, then the upward/downward viewing angle widens and crosstalk is reduced, but moiré patterns are generated and 2D image visibility is degraded
Solution Approach 1:
The patent shifts the black stripe pattern from the retarder layer to the backlight unit layer, changing the spatial dimension and layer position where the pattern exists. This dimensional change allows the pattern to serve its 3D function without interacting with the pixel structure to create moiré, as it is now positioned before the liquid crystal layer rather than within or after it.
Solution Approach 2:
The patent introduces a new component structure - the backlight unit with integrated black stripe pattern - that acts as an intermediary element between the light source and the liquid crystal layer. This intermediary structure provides the necessary optical function for 3D display while isolating the moiré-causing interaction from the pixel-retarder interface.
2Reliability
If black stripes are formed in patterned retarder regions to improve 3D image visibility, then the viewing angle widens, but the luminance of 2D image is drastically degraded
Solution Approach 1:
By relocating the black stripe pattern to the backlight unit layer rather than the retarder layer, the patent changes the optical path interaction. The pattern now affects light before it enters the liquid crystal modulation layer, allowing for more efficient light utilization and reduced luminance loss during 2D display while maintaining the viewing angle expansion function for 3D display.
Solution Approach 2:
The patent applies the black stripe pattern locally and selectively in the backlight unit, positioning it specifically to control light distribution for 3D viewing angles without uniformly degrading the overall luminance. The pattern is strategically placed to achieve its function while minimizing impact on general image brightness.
3Reliability
If the size of black matrixes and black stripes is increased to widen viewing angle, then the upward/downward viewing angle increases, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the black stripe pattern from the complex retarder-pixel interface system and places it in the simpler backlight unit structure. This separation removes the pattern from the critical alignment zone where it would interact with pixel structures, thereby reducing alignment complexity and manufacturing difficulty while preserving the viewing angle function.
Solution Approach 2:
By moving the pattern to a different layer dimension (backlight unit layer instead of retarder layer), the patent eliminates the need for precise lateral alignment with pixels, as the pattern now operates in a different spatial plane. This dimensional relocation simplifies the manufacturing process and reduces alignment requirements.
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 provides improved 3D visibility with a wider viewing angle and maintains 2D image luminance and quality by eliminating crosstalk and moiré patterns, allowing for better image display without the side effects of black stripe patterns.
Implementation Method 1
a patterned retarder 5 for converting polarization characteristics of light incident on polarization glasses 6 on a display panel 3
Implementation Method 2
a patterned retarder including a first retarder and a second retarder which are arranged line by line, the patterned retarder dividing a 3D image from the image display panel into a first polarization component and a second polarization component
Data Source
AI summary
An image display device including an image display panel configured to display a 2D image and a 3D image, a driving circuit configured to apply a data voltage of a 2D data format or a data voltage of a 3D data format to the image display panel, a controller configured to control the driving circuit in a 2D mode for displaying the 2D image or a 3D mode for displaying the 3D image, and a patterned retarder including a first retarder and a second retarder that are arranged line by line, the patterned retarder configured to divide the 3D image from the image display panel into a first polarization component and a second polarization component, the patterned retarder being aligned so that boundary portions of the first and second retarders are positioned in a center of pixels positioned on odd-numbered horizontal lines or even-numbered horizontal lines of the image display panel.