A retina scanning type display apparatus includes a scanning portion, a deflection member, and a light flux diameter expanding element. An incidence angle range in a first incidence direction with respect to an eye from the deflection member is broader than an incidence angle range in a second incidence direction, and, in the light flux diameter expanding element, an expanding magnification of light flux diameter in a first expanding direction, which corresponds to the first incidence direction, is greater than an expanding magnification of light flux diameter in a second expanding direction, which corresponds to the second incidence direction. In addition, in the scanning mirror, a width in a first scanning direction, which corresponds to the first expanding direction, is narrower than a width in a second scanning direction, which corresponds to the second expanding direction.

An image projection apparatus (1) joins a plurality of display images displayed by scanning a plurality of light beams, as if there is no seam between them, thereby displaying a large-sized high-quality image. The image projection apparatus (1) includes a MEMS mirror device (11), a MEMS mirror control unit (13), and a laser beam detector (19). The MEMS mirror control unit (13) makes the laser beam detector (19) irradiated with a first light beam (L1), and at this time adjusts a position of a first display image (18a) on the basis of a difference between a detection signal output from a first light sensor (191) and a detection signal output from a second light sensor (192); the MEMS mirror control unit (13) makes a first light reception surface and a second light reception surface irradiated with a second light beam (L2), and at this time adjusts a position of a second display image (18b) on the basis of a difference between a detection signal output from the first light sensor (191) and a detection signal output from the second light sensor (192).

Devices and methods are described herein to measure optical power in scanning laser projectors. In general, the devices and methods utilize a filter component and photodiode to measure optical power being generated by at least one laser light source, with the filter component configured to at least partially compensate for the non-uniform electric current response of the photodiode. Such a configuration facilitates accurate optical power measurement using only one photodiode, and thus can facilitate accurate optical power measurement in a relatively compact device and with relatively low cost.

This image display apparatus includes a plurality of laser beam source portions outputting laser beams of a plurality of color components different from each other, a synthesized beam generation portion synthesizing the laser beams of the plurality of color components, a control portion controlling the outputs of the laser beam source portions, and a driving current correction portion estimating a variation in the threshold current of each of the laser beam source portions and correcting a driving current on the basis of the estimated variation in the threshold current.

Devices and methods are described herein that use a first solid figure element, a polarizing beam splitter, and a second solid figure element to reduce speckle in projected images. Specifically, laser light is generated and split into two portions having orthogonal polarizations. The first portion of laser light is internally reflected off at least three internal faces of the second solid figure element and is then spatially recombined with the second portion of laser light in the first solid figure element. The difference in path length followed by the two portions generates a temporal incoherence in the recombined laser light beam, and that temporal incoherence reduces speckle in the projected image.

A display control device includes: a receiver configured to receive an image signal; a measurer configured to measure the number of vertical scanning lines and horizontal scanning time of the image signal; a table generator configured to generate a provisional signal table when data measured by the measurer has not been retained in a previously prepared signal table; a detector configured to detect data for regulating an active display region of an image, from the image signal; and an updater configured to update the provisional signal table, based on a detection result by the detector.

A scan display system includes a picture receiving unit, a scan needle, a picture display screen having first and second opposing surfaces, and a driving unit. The picture receiving unit is configured to receive picture data and transmits the picture data to the scan needle. The driving unit is configured to perform a picture scanning process by moving the scan needle to scan in a horizontal direction relative to the first of the picture display screen at a predetermined frequency. The scan needle is configured to emit light, representative of the picture data, to the first surface of the picture display screen to project image lines, each image line being formed by the scan needle during the scan. The picture display screen is configured to receive the emitted light on the first surface and display an image comprising the image lines on the second surface.

An image display device includes: an RGB laser diode configured to output laser light; a horizontal scanner configured to reflect the laser light and perform a reciprocating operation in a horizontal direction; a scanning detection unit configured to detect a forward or reverse operation range and a reciprocating operation range in each line in the horizontal direction; a drawing position control unit configured to determine an image display position in each line based on a difference between the detected operation ranges and a reference value; and a laser driver configured to drive the RGB laser diode based on image data at a timing corresponding to the determined image display position.

A scanning projector and method is provided that that uses at least one multi-stripe laser to generate the laser light for the scanned image. Specifically, the multi-stripe laser includes at least a first laser element and a second laser element formed together on a semiconductor die. The first laser element is configured to output a first laser light beam, and the second laser element is configured to output a second laser light beam. At least one scanning mirror is configured to reflect the first laser light beam and the second laser light beam, and a drive circuit is configured to provide an excitation signal to excite motion of the at least one scanning mirror. Specifically, the motion is excited such that the at least one scanning mirror reflects the first laser light beam and the second laser light beam in a raster pattern of scan lines.

A display system includes a display screen with at least one servo feedback mark in each of a plurality of display regions, and a plurality of subsystems each subsystem configured to generate an image on an associated display region. Each subsystem generate a plurality of scanning beams including an excitation beam and a servo beam, a beam scanning module, a servo feedback detector, and a controller. The beam scanning module includes a resonant scanning mirror configured to scan the scanning beams along a first scanning direction and a linear scanning mirror to scan the scanning beams along a second scanning direction. The controller is configured to receive image data, to modulate the excitation beam in accordance with the image data, and to control timing of modulation of the excitation beam based on the monitor signal to align the modulation with corresponding pixel positions on the display screen.