Projector Optical Axis Shifting for Resolution Preservation

The patent introduces an intermediate position between the first and second pixel positions. The optical axis shifting element moves the pixel through this intermediate position rather than directly from the first to the second position. This intermediary step allows the liquid crystal element's transmittance to stabilize at each position, preventing brightness changes from overlapping with adjacent positions and thus maintaining projection resolution while still achieving pixel shifting.

The patent divides the pixel shifting process into multiple segments: moving from the first position to an intermediate position, stabilizing, then moving from the intermediate position to the second position, and stabilizing again. This segmentation of the motion path allows the slow transmittance change of the liquid crystal element to complete at each segment, preventing the harmful overlap of brightness changes that would occur in a direct single-step shift.

The patent applies the voltage to the liquid crystal element in advance before the optical axis shifting element moves to the next position. By the time the optical axis shifting completes the movement, the liquid crystal element has already stabilized its transmittance at the new position. This preliminary action ensures that the slow transmittance response does not cause brightness changes to overlap with adjacent positions.

The intermediate position serves as a mediator that provides sufficient time for the liquid crystal element's slow transmittance change to complete. By stopping at the intermediate position, the system allows the liquid crystal to stabilize before proceeding to the next position, thus reconciling the slow response speed with the need for stable pixel brightness at each position.

The intermediate position acts as a mediator that prevents the harmful brightness change overlap. By routing the optical axis shift through this intermediate position and allowing stabilization at each step, the patent eliminates the direct cause of the harmful effect (simultaneous brightness changes at multiple positions), thereby preserving the resolution enhancement benefit of optical axis shifting.

The patent extracts or separates the brightness change process from the position shifting process by introducing intermediate stopping points. Instead of having brightness changes occur continuously during the shift, the system extracts the stabilization step and places it at each position (including the intermediate position), ensuring that brightness changes are confined to discrete positions rather than overlapping across multiple positions.