Abstract:
One embodiment relates to an optical navigation apparatus. The apparatus includes a hole in a surface of the apparatus, a light source providing an illuminating beam through said hole, an imaging system configured to receive light generated by an illuminated portion of a finger placed above said hole and to produce an image from the light at a detector plane, and a tracking sensor array positioned at the detector plane that is configured to detect lateral movement of said finger relative to said hole. In addition, the apparatus includes a lift sensor positioned at the detector plane that is configured to detect lifting of said finger above said surface of the apparatus. Other embodiments, aspects and features are also disclosed.
Abstract:
One embodiment relates to a method of sensing motion of an optical sensor relative to a surface. A first resolution and a second resolution are set. Measurement signals are obtained from a sensor array, and the motion of the optical sensor relative to the surface is tracked using the measurement signals. The tracking of the motion in a first dimension (1002-1010) is performed at the first resolution (1001), and the tracking of the motion in a second dimension (1022-1030) is performed at the second resolution (1021). Another embodiment relates to an optical sensor apparatus for sensing motion relative to a surface, wherein the tracking of the motion is performed at a variable resolution along each of two axes. Other embodiments and features are also disclosed.
Abstract:
One embodiment described relates to an optical displacement sensor for sensing movement of a data input device across a surface (304) by detecting displacement of optical features in a succession of images of the surface (304). The sensor includes a detector having an array (for example, 1502) including a number (N) of sets of photosensitive elements, each set having a number (M) of photosensitive elements, where M is greater than two and not equal to four. Signals from each of the photosensitive elements in a set are electrically coupled or combined with (see, for example, 1202) corresponding photosensitive elements in other sets to produce a total of M independent group signals from M interlaced groups of photosensitive elements. Other embodiments are also described.
Abstract:
One embodiment relates to an optical displacement sensor for sensing transverse displacement of a data input device relative to a surface by determining displacement of optical features in a succession of frames. The sensor includes at least a coherent light source (306), illumination optics (308) to illuminate a portion of the surface (304), imaging optics (310), and a first array (302) of photosensitive elements having a periodic distance. The illuminator and the detector are configured to produce on the first array (302) of photosensitive elements an intensity pattern of light reflected from the illuminated portion of the surface. The intensity pattern comprises a plurality of speckles having an average speckle diameter which is between one half and two times the periodic distance of the array (302).
Abstract:
An example head-mounted display device includes a light projector, an optical assembly arranged to direct light from a light projector to a user, and an actuator module. The optical assembly includes a variable focus lens assembly including a rigid refractive component, a shaper ring defining an aperture, and a flexible lens membrane between the shaper ring and the rigid refractive component and covering the aperture. The refractive component, the shaper ring, and the lens membrane are arranged along an axis. The refractive component and the lens membrane define a chamber containing a volume of fluid. The actuator module is configured to adjust an optical power of the variable focus lens by moving the shaper ring relative to the refractive component along the axis, such that a curvature of the lens membrane in the aperture is modified.
Abstract:
An integrated back light unit can include a light guide plate having a non-uniform distribution of extraction features. The non-uniform distribution of the extraction features can be provided by an extraction-feature-free region in proximity to a light emitting device, and/or by a variable density of the extraction features that changes with distance from the light emitting device. Additionally or alternatively, the light guide unit can include a heterogeneous reflectivity surface that has a different reflectivity at proximity to the light emitting device assembly than at a distal portion of the light guide unit. The different reflectivity may be provided by a specular reflective material, diffusive reflective material, or a light absorbing material. The non-uniform distribution of extraction features and/or the heterogeneous reflectivity surface can be employed to enhance brightness uniformity of the reflective light and/or to control the temperature distribution within the light guide unit.
Abstract:
One embodiment relates to an optical navigation apparatus. The apparatus includes a hole in a surface of the apparatus, a light source providing an illuminating beam through said hole, an imaging system configured to receive light generated by an illuminated portion of a finger placed above said hole and to produce an image from the light at a detector plane, and a tracking sensor array positioned at the detector plane that is configured to detect lateral movement of said finger relative to said hole. In addition, the apparatus includes a lift sensor positioned at the detector plane that is configured to detect lifting of said finger above said surface of the apparatus. Other embodiments, aspects and features are also disclosed.
Abstract:
One embodiment relates to an optical displacement sensor for sensing relative movement between a data input device and a surface (304) by determining displacement of optical features in a succession of frames of the surface. The sensor includes at least a detector, first circuitry, and second circuitry. The detector includes a plurality of photosensitive elements organized in first and second arrays (for example, 1502 and 1504). The first circuitry is configured to combine signals from every M'th element of the first array to generate M group signals, and the second circuitry is configured to combine signals from every M'th element of the second array to generate M' group signals. M and M' are numbers which are different from each other. Other embodiments are also disclosed.
Abstract:
One embodiment relates to an optical displacement sensor for sensing relative movement between a data input device and a surface (304) by determining displacement of optical features in a succession of images of the surface (304) . The sensor includes a plurality of linear comb arrays (LCAs) (502) arranged along an associated axis. Each LCA comprises a row of photosensistive elements parallel to the associated axis. Another embodiment relates to a method of sensing movement of a data input device across a surface (304). An intensity pattern of light reflected from an illuminated portion of the surface (304) is detected using a first plurality of linear comb arrays (LCAs) arranged along a first axis and a second plurality of LCAs arranged along a second axis not parallel to the first axis. Other embodiments are also described.
Abstract:
A head-mounted apparatus include an eyepiece including a variable dimming assembly and a frame mounting the eyepiece so that a user side of the eyepiece faces a towards a user and a world side of the eyepiece opposite the first side faces away from the user. The dynamic dimming assembly selectively modulates an intensity of light transmitted parallel to an optical axis from the world side to the user side during operation. The dynamic dimming assembly includes a variable birefringence cell having multiple pixels each having an independently variable birefringence, a first linear polarizer arranged on the user side of the variable birefringence cell, the first linear polarizer being configured to transmit light propagating parallel to the optical axis linearly polarized along a pass axis of the first linear polarizer orthogonal to the optical axis, a quarter wave plate arranged between the variable birefringence cell and the first linear polarizer.