Dissimilar Color Filter Offsets Reduce Moire in Multi-Display Systems
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Solution Overview
Problem
Multi-layer display systems experience moire interference due to interactions between color filters, leading to reduced image clarity and increased weight and cost, as existing solutions using diffusers compromise image quality and form factor.
Innovation Solution
Dissimilar color filter arrangements on different displays, combined with other moire-reducing techniques like diffusers or refractive elements, are used to eliminate or significantly reduce moire interference without sacrificing display resolution and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If diffusers are used to reduce moire interference, then moire interference is reduced, but image clarity deteriorates and system complexity increases
Solution Approach 1:
The patent applies parameter changes by offsetting the color filters in the second display layer relative to the first layer by sub-pixel distances. This parameter modification (position offset) disrupts the periodic interference pattern that causes moire effects while preserving the optical path for clear image transmission, thus reducing moire interference without compromising image clarity.
Solution Approach 2:
The patent introduces a new dimension of control by using color filter offsets in the sub-pixel dimension rather than relying on diffusive optics. This dimensional approach (offsetting by fractions of pixel dimensions) provides a more precise method to eliminate moire interference without the blurring effect of diffusers, maintaining image sharpness while addressing the harmful interference.
2Object-affected harmful factors
If diffusers are used to reduce moire interference, then moire interference is reduced, but device complexity increases
Solution Approach 1:
The patent extracts the moire interference reduction function from the optical path by implementing it through color filter pattern design rather than inserting physical diffusing elements. This extraction eliminates the need for additional diffuser components, polarizer adjustments, and stiffener substrates, thereby reducing device complexity while still achieving moire interference reduction.
Solution Approach 2:
The patent uses the color filter layer itself as an intermediary element to reduce moire interference through strategic offsetting, rather than introducing separate diffuser components. This intermediary approach (using existing color filters with modified positioning) achieves the desired effect without adding the complexity of specialized diffuser patterns and associated structural requirements.
3Adaptability or versatility
If conventional stacked displays are used, then three-dimensional display capability is achieved, but moire interference occurs
Solution Approach 1:
The patent modifies the positional parameters of color filters in the stacked display configuration. By offsetting the color filters in the second layer relative to the first layer by sub-pixel distances, the patent maintains the three-dimensional display capability while changing the spatial parameters to eliminate the periodic alignment that causes moire interference patterns.
Solution Approach 2:
The patent introduces asymmetry in the color filter arrangement between the two display layers. The color filters in the second layer are positioned asymmetrically relative to the first layer, with horizontal and vertical offsets that break the symmetry responsible for moire interference, while still maintaining the stacked configuration necessary for three-dimensional display functionality.
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 effectively eliminates moire interference, maintaining high image resolution and contrast while reducing the complexity and weight of the display system, providing a more aesthetically pleasing and cost-effective solution.
Implementation Method 1
moire interference occurs. The moire interference is caused by interactions between the color filters within the layers when projected onto the viewer's retina
Data Source
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Figure 4A
AI summary
A multi-display system (e.g., a display including multiple display panels) includes at least first and second displays (e.g., display panels or display layers) arranged substantially parallel to each other in order to display three-dimensional (3D) features to a viewer(s). The first and second displays have different color filter patterns, respectively, as viewed from a point of view of a viewer of the display device, in order to reduce moiré interference.