Staggered Light Valve Panel for 3D Printing Surface Smoothness

The light valve panel is divided into a first light valve array substrate and a second light valve array substrate, each with pixel units arranged in arrays. The pixel units are staggered between substrates, with orthographic projections partially overlapping. This segmentation allows each substrate to contribute to different portions of the projected pattern, reducing the stepped contour effect and improving printing accuracy without requiring a complete redesign of the projection system.

The invention transitions from a single-layer pixel array to a multi-layer stacked structure. The pixel units on the first and second substrates are arranged in different positions vertically (along the stacking direction), creating a three-dimensional staggered arrangement. This dimensional change enables finer effective pixel density and smoother projected edges by distributing light modulation across multiple vertical layers.

The pixel array is segmented across two separate substrates instead of being confined to a single substrate. Each substrate carries a portion of the pixel units in a staggered arrangement, which reduces the stepped contour effect and improves surface smoothness. The segmentation allows the complex staggered pattern to be manufactured using standard substrate fabrication processes, rather than requiring a single complex substrate.

The first and second light valve array substrates are combined in a stacked configuration to form a unified light valve panel. The pixel units from both substrates work together to produce the projected pattern, merging their functions to achieve higher effective resolution and smoother edges. This combining approach maintains ease of manufacture by using identical or similar substrate structures that can be produced using the same fabrication processes.

Instead of increasing pixel density within a single substrate plane, the invention adds a vertical dimension by stacking two substrates with staggered pixel arrangements. This three-dimensional arrangement effectively doubles the DPI without requiring each individual substrate to have extremely fine pitch pixels, which would be difficult to manufacture. The vertical stacking provides an additional degree of freedom for achieving high resolution.

The high-DPI requirement is segmented across two substrates rather than concentrated in one. Each substrate can maintain a moderate pixel pitch that is easier to manufacture, while the combined staggered arrangement of both substrates achieves the target high DPI. This segmentation avoids the manufacturing difficulties associated with producing a single substrate with extremely high pixel density.

The projection of multiple exposure patterns is segmented across two light valve array substrates. Each substrate is responsible for modulating light for its assigned pixel units, and the staggered arrangement ensures that the combined output from both substrates creates smooth edges. This segmentation simplifies the control logic compared to attempting to manage all pixels in a single substrate with complex multi-pattern projection.

The light modulation functions of two separate substrates are merged to produce the final projected image. By combining the outputs of both substrates with staggered pixel arrangements, the system achieves smoother edges and higher quality projection without requiring a single complex substrate to handle all the computational and optical complexity of multiple exposure patterns.