DND Driver Architecture Spatial Grouping for High Refresh Rates
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Solution Overview
Problem
Holographic projection systems face challenges in achieving high system refresh rates due to the limitations of existing DND reprogramming rates, which are insufficient for large-scale optically-tiled displays, resulting in limited viewing angles and inadequate data throughput.
Innovation Solution
A DND driver architecture that groups second line drivers spatially to serve blocks of DND elements, allowing for increased system refresh rates by reducing the time constant and enabling 100% fill factor without missing rows or columns, and includes additional routing resources to connect drivers efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the DND array size is increased to achieve larger display area, then the display area is improved, but the data throughput requirement increases significantly
Solution Approach 1:
The patent divides the large DND array into multiple smaller tiles that can be independently controlled and updated. This segmentation allows the system to manage data throughput requirements for each tile separately, reducing the peak data rate needed compared to updating a single large array, while still achieving a large overall display area through optical tiling of multiple smaller physical chips.
2Productivity
If the reprogramming rate is increased to achieve higher refresh rates, then the system refresh rate is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a spatial dimension to the driver architecture by distributing drivers across the chip area rather than concentrating them at edges. This allows parallel actuation of multiple DND rows simultaneously, achieving high refresh rates (100 kHz+) without requiring excessively complex sequential scanning mechanisms.
Solution Approach 2:
The patent embeds driver circuits directly within the DND array structure, with drivers positioned underneath the DND elements they control. This nested arrangement reduces the distance between drivers and DNDs, minimizing signal propagation delays and enabling faster reprogramming rates while keeping the overall device footprint compact.
3Adaptability or versatility
If the pitch is decreased to achieve larger projection angle, then the projection angle is improved, but the manufacturing precision requirement increases
Solution Approach 1:
By dividing the display into multiple tiles with moderate pitch values, the system achieves large overall projection angles through the geometric arrangement of tiles rather than requiring extremely small pitch values. This segmentation approach maintains manufacturability while achieving the desired viewing angles.
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 solution achieves refresh rates exceeding 100 kHz, enabling high-speed holographic visualization systems with improved reliability and reduced chip area requirements, suitable for large-scale displays like 5×5 optically-tiled systems.
Implementation Method 1
Each DND comprises a movable optically reflective nano-mirror for reflecting an incoming light wave
Implementation Method 2
Light waves diffracted at one nano-mirror will spread out in all directions
Implementation Method 3
interfere with light waves diffracted at other nano-mirrors
Implementation Method 4
a mechanical spring allowing the nano-mirror to move
Implementation Method 5
at least two electrodes for actuating the nano-mirror. These electrodes are biased via the corresponding driver circuit in order to actuate the desired movement of the nano-mirror
Data Source
AI summary
A DND chip is disclosed. In one aspect, the chip includes a 2D DND array of DND elements logically arranged in rows and columns, and a DND driver architecture for actuating the DND elements. The DND driver has a set of first drive lines along the rows and a set of second drive lines along the columns, a set of first line drivers for each biasing one line from the set of first drive lines and a set of second line drivers for each biasing a line from the set of second drive lines. A plurality of second line drivers are spatially grouped together to serve a block of DND elements, and that plurality of second line drivers are spatially covered substantially completely by at least some DND elements of the block of DND elements. A holographic visualization system including the DND chip is provided.