An electronic device is disclosed herein that includes an infrared light source to emit infrared light, a rolling shutter sensor, and at least one processor. The at least one processor is to: cause the rolling shutter sensor to output a first signal corresponding to a first frame of image data during exposure to the infrared light, reset the rows of the rolling shutter sensor at a same time, cause the rolling shutter sensor to output a second signal corresponding to a second frame of image data without exposure to the infrared light from the infrared light source, determine a difference between the first signal and the second signal to generate an ambient infrared free frame, and recognize a face based on the ambient infrared free frame.

A display panel includes a first substrate in which first, second and third pixel areas and a light blocking area are defined, and a second substrate. The first substrate includes a base layer, a first wavelength conversion layer disposed under the base layer, a second wavelength conversion layer disposed under the base layer, an optical layer disposed under the base layer, a first partition layer disposed between the first and second wavelength conversion layers and including a first layer including a same material as that of the optical layer and a second layer spaced apart from the base layer with the first layer interposed therebetween, and a second partition layer disposed between the second wavelength conversion layer and the optical layer.

An object is to provide an optical element in which a wavelength dependence of reflection is small, a light guide element including the optical element, and an image display device including the light guide element. The optical element includes a plurality of cholesteric liquid crystal layers having different selective reflection center wavelengths, in which the cholesteric liquid crystal layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction, and in a case where a length over which the optical axis rotates by 180 in the in-plane direction is set as a single period, a permutation of lengths of selective reflection center wavelengths and a permutation of lengths of the single periods match each other in the cholesteric liquid crystal layers.

A transparent display panel is provided, including a liquid crystal cell, a chromic material and a trigger component. The liquid crystal cell includes an array substrate and a first transparent substrate disposed opposite each other. A liquid crystal layer is arranged between the array substrate and the first transparent substrate. The chromic material is arranged at a side of the first transparent substrate away from the array substrate. The trigger component is connected to the chromic material for enabling the chromic material to perform a reversible change between a transparent state and a colored state.

An apparatus for a combined camera system is described herein. The apparatus includes an adjustable infrared (IR) pass filter. A passband of the adjustable infrared (IR) pass filter is electrically adjusted. The apparatus also includes a rolling shutter sensor. An adjustable filter is to implement a global shutter and a rolling shutter sensor global reset.

A lighting device includes a light source, a light reflecting unit, and a light diffusing unit. The light reflecting unit is arranged on an exit side of a light exit path with respect to the light source to reflect at least a part of a light emitted from the light source and transmit a part of the light. The light reflecting unit has an angle selecting property such that a reflectance of a light having a small incident angle becomes higher than a reflectance of a light having a large incident angle. The light diffusing unit is arranged between the light source and the light reflecting unit in the light exit path to diffuse the light.

An imaging device is disclosed. The device comprises an image sensor configured to capture image data and a filter. The filter is configured to selectively control a range of wavelengths of light entering the image sensor. The filter comprises a liquid crystal structure configured to pass the range of wavelengths in a first configuration and reflect the range of wavelengths in a second configuration. The device further comprises a controller in communication with the image sensor and the filter. The controller is configured to adjust the filter from the first configuration to the second configuration in response to an environmental lighting condition.

A camera system includes an image sensor assembly and a tunable optical element. The tunable optical element is a gradient index (GRIN) lens created from a polymer dispersed liquid crystal and a coupled control element. The GRIN lens is tunable by applying an electric field to the optical element via a control element. The control element applies a voltage differential to the optical element inducing an electric field which changes the polarization of the PDLC within the optical element. The electrodes of the control element can include sheet resistors with a radially dependent voltage drop. The refractive index of the GRIN lens is dependent on the polarization of the liquid crystals within the optical element. Applying the electric field to the tunable element changes the optical properties of the grating.

A monochrome display is converted into a color display by including an electrically controllable planar color filter plate switchable between primary colors and operating the display in a color field sequential mode. Hence the requirement for a color switchable illumination source is eliminated. For example the illumination source may be a white OLED, an illumination type which, in combination with a microlens array, has proven well suited for directional displays. Further the need for a color mask is eliminated, thereby eliminating problems of moiree interference with a microlens array and further eliminating problems of diffraction patterns in infrared images captured through the display for example for observer tracking purposes. The electrically controllable planar color filter plate may comprise two wavelength dependent wave retarders and two liquid crystal cells.

An electric response infrared reflection device and a preparation method thereof. The device comprises three light-transmitting conductive substrates which are oppositely arranged. Two adjacent light-transmitting conductive substrates of the three light-transmitting conductive substrates are respectively packaged to form a first adjusting area and a second adjusting area. Both the first adjusting area and the second adjusting area are filled with liquid crystal layers. Each of the liquid crystal layers comprises a mixed liquid crystal material. The mixed liquid crystal material comprises a chiral nematic phase liquid crystal, a monomer, a photoinitiator, and a chiral dopant. The spiral direction of the chiral nematic phase liquid crystal in the first adjusting area is opposite to the spiral direction of the chiral nematic phase liquid crystal in the second adjusting area, so that the total reflection of an infrared band can be implemented.