A device and methods, the device comprising: a photo detector comprising a waveguide; two metal layers connected to the photo detector; a measurement device connected between the two metal layers, for measuring an electric parameter between the two metal layers, said electric parameter indicative of an amount of light propagating through the waveguide; and a voltage source connected between the two metal layers, wherein applying voltage between the two metal layers changes a refraction index of the waveguide, thereby affecting a phase of light propagating through the waveguide, and wherein the voltage to be applied is determined in accordance with the resistance measured by the resistance measurement device.

A technique for tuning a silicon photonics (SiP) based nested (parent/child) Mach-Zehnder modulator (MZM). The technique includes a sequence of applying dither tones on individual arms of the child MZMs, observing changes in the output of the MZM, and adjusting the MZM until reaching the null points for the child MZMs and the quad point for the parent MZM.

An optical modulator includes a substrate having an electro-optic effect, an optical waveguide formed on the substrate, a modulation part which modulates light waves propagating through the optical waveguide, and a light receiving element which detects the light waves propagating through the optical waveguide. As the modulation part, a first modulation part and a second modulation part, which respectively modulate light waves into which input light branches, are provided. As the light receiving element, a light receiving element for the first modulation part and a light receiving element for the second modulation part are provided. The light receiving elements are disposed such that their positions in a light propagation direction are shifted from each other by an amount corresponding to one light receiving element, or more.

A display panel and an electronic device are disclosed. The display panel includes a display area and a functional area. The functional area includes a first switch transistor, a second switch transistor, a sensing transistor, and a sensing capacitor. Specifically, an upper plate of the sensing capacitor is a transparent plate. The functional area can also serve a displaying function while performing color temperature sensing, gas sensing, or laser sensing, which increases an aperture ratio and transmittance of the display panel, so that an overall visual effect of the display panel is improved.

A dual screen display device, dual screen display method, and electronic equipment are described. The device includes a first display unit and a second display unit, a light receiving surface of the first display unit being arranged opposite to a light receiving surface of the second display unit; a backlight module unit, arranged between the light receiving surface of the first display unit and the light receiving surface of the second display unit; a light source unit, used for emitting illumination light to the backlight module unit; and a first polarization filtering unit and a second polarization filtering unit, arranged on the light receiving surface of the first display unit and the light receiving surface of the second display unit respectively.

A display having a variably controlled backlight and/or driver is disclosed. The backlight includes a first light source that emits light within a first spectral power distribution and has a first radiant power output. A second light source emits light within a second spectral power distribution matched to an optical filter for producing a perceived chromaticity and luminosity matching the perceived display appearance without the optical filter.

A light blocking screen includes a liquid crystal array mounted to a window. The liquid crystal array has a plurality of liquid crystal (LC) pixels, each of which is selectively darkenable. A controller is operatively connected to the liquid crystal array and configured to darken a set of the LC pixels, such that the darkened set of LC pixels limits light passage through the window in one or more selected areas. The LC pixels need not limit light passage through the entire window. The controller may determine a location of a glare source relative to the window and a location of a user proximate the window, and then darken the set of the LC pixels in an area between the glare source and the user, such that the glare source is limited from shining onto the user. The screen may be incorporated into vehicles or buildings.

A display may include a color filter layer, a liquid crystal layer, and a thin-film transistor layer. A camera window may be formed in the display to accommodate a camera. The camera window may be formed by creating a notch in the thin-film transistor layer that extends inwardly from the edge of the thin-film transistor layer. The notch may be formed by scribing the thin-film transistor layer around the notch location and breaking away a portion of the thin-film transistor layer. A camera window may also be formed by grinding a hole in the display. The hole may penetrate partway into the thin-film transistor layer, may penetrate through the transistor layer but not into the color filter layer, or may pass through the thin-film transistor layer and partly into the color filter layer.

Configurations for display stacks of an electronic device and methods for mitigating crosstalk are disclosed. The display stack may include a transceiver module, which may be located under or behind the display. The transceiver module may include a transmitter module, which may provide polarized light from the transmitter that may suppress module crosstalk. The transceiver module also may include a receiver module, which may include polarization control elements and an analyzer for differentiating between a target signal and a crosstalk signal. The polarization control on both the transmitter module and receiver module sides may suppress the crosstalk signals, which may be due to the reflections between and within the elements of the display stack and resulting from positioning the transceiver module behind the display.

A liquid crystal display device includes an array substrate, a liquid crystal layer, and a color filter substrate facing the array substrate through the liquid crystal layer. The color filter substrate includes a carbon light-shielding layer, an organic pigment light-shielding layer, and color filters formed such that the organic pigment light-shielding layer overlaps with at least one of the color filters in a direction perpendicular to a substrate plane. The array substrate includes a first light sensor that detects light which passes through any of the color filters without passing through the organic pigment light-shielding layer in the direction perpendicular to the substrate plane. The array substrate further includes a second light sensor that detects light which passes through the organic pigment light-shielding layer and any of the color filters in the direction perpendicular to the substrate plane.