A head up display apparatus for a vehicle includes an imaging unit that generates a projection light beam with display content and includes a transmissive display indication layer with selectively controllable display elements distributed over an area, a matrix backlight that provides backlighting therefor and includes selectively controllable light sources distributed along the transmissive display indication layer, and a collimation array with collimators arranged between a light source and the transmissive display indication layer, and a projection panel in the beam path of the projection light beam generated by the imaging unit for reflecting the projection light beam to a user, the projection panel being arranged in the beam path such that a virtual display image is generated therebehind in the visual field of the user.

Provided are a terminal device and a folding display screen thereof. The folding display screen includes a flexible display panel and an axis-variable folding assembly arranged on a back of the flexible display panel. The axis-variable folding assembly includes a shaft body and magnetic coils positioned to the shaft body. The shaft body includes a flexible outer layer connected to the flexible display panel and a plurality of magnetic beads wrapped by the flexible outer layer. The plurality of magnetic beads are movable relative to each other in a folding motion of the axis-variable folding assembly. Upon a change in a current supplied to the magnetic coils, the magnetic coils can generate a variable magnetic field to adjust an arrangement of the plurality of magnetic beads wrapped by the flexible outer layer.

A transparent display apparatus includes a liquid crystal cell and a Sight source opposite to a side surface of the ceil. The cell Includes a first substrate, first electrodes on the first substrate, a second substrate, a second electrode on the first or second substrata, a liquid crystal layer between the two substrates, signal lines on the first substrate, and a light-shielding pattern on the second substrate. The layer is configured to totally reflect or scatter light from the light source incident to a region, opposite to a first electrode, due to action of an electric field provided by the first and second electrodes. At least one signal line has a bottom surface and a light-reflecting side surface facing the light source, and a slope angle therebetween is acute. The pattern is located in a reflection path after a portion of the light irradiates the light-reflecting side surface.

A current-selectable light-emitting-diode (LED) display includes pixels distributed in an array of rows and columns. The pixels are grouped in mutually exclusive clusters and cluster controllers are connected to each pixel in a cluster of pixels to control the pixels in the cluster to emit light. Each cluster controller comprises a selectable current source. Each of the selectable current sources can include cluster current sources that are responsive to a current-select signal to enable one or more of the cluster current sources. The pixels can include micro-LEDs and the cluster controller can be disposed between the micro-LEDs. The display can be disposed on a display substrate with signal wires. The signal wires can include separate wire segments that are electrically connected through regeneration circuits that regenerate the signals. The display can be an information display or a backlight.

A light module driving method for a illumination device, wherein the illumination device includes a driving unit, a transformation unit, a compensation and calibration unit and a light module, and the driving unit is configured to output a light driving signal according to a source, wherein the transformation unit is coupled to the driving unit and the light module, and the light driving signal is configured to drive a plurality of lighting zones corresponding to a light-emitting diode (LED) module of the light module, wherein the light module driving method includes transforming, by the transformation unit, the light driving signal into a plurality of modulated light driving signals according to the compensation and calibration unit to drive each lighting zone corresponding to the LED module.

In one embodiment, a method for managing visual uniformity in a foldable display includes identifying a hinge angle of the foldable display, the hinge angle indicating a degree to which the foldable display is opened or closed; receiving surface curvature data from a plurality of sensors of the foldable display, the surface curvature data indicating a mechanical state of a surface of the foldable display; accessing a plurality of surface maps stored in a display database of the foldable display, each of the plurality of surface maps indicating one or more display settings associated with a respective mechanical state of the surface of the foldable display; retrieving the one or more display settings from the display database based on the hinge angle and the surface curvature data; and causing a plurality of pixels to illuminate using the one or more display settings.

A method for driving electro-optic displays so as to reduce visible artifacts are described. Such methods include driving extra pixels where the boundary between a driven and undriven area would otherwise lead to artifact by providing paired sets of driving instructions, allowing the undriven area to be driven while maintain the desired (undriven) optical state.

The present invention includes systems and methods for a six-primary color system for display. A six-primary color system increases the number of primary colors available in a color system and color system equipment. Increasing the number of primary colors reduces metameric errors from viewer to viewer. The six-primary color system includes Red, Green, Blue, Cyan, Yellow, and Magenta primaries. The systems of the present invention maintain compatibility with existing color systems and equipment and provide systems for backwards compatibility with older color systems.

An attendance tracking device for keeping a restroom cleaning log includes a radio-frequency, RF, module that periodically sends beacon signals and receives at least one response signal from a mobile device of a user. The tracking device further includes an electrophoretic display having a display controller and memory. The display controller executes a method that includes causing the RF module to periodically send beacon signals, detecting a received response signal from the mobile device, creating an attendance log including time stamp information regarding the presence of the mobile device, and triggering an update of the electrophoretic display to display the attendance log. A mobile device can be adapted to implement or be used in connection with the attendance tracking device. A system includes the attendance tracking device and the mobile device. Methods for operating the attendance tracking device and the mobile device are used to implement attendance tracking.

According to one embodiment, a color changing display includes a housing, a cover cooperatively coupled to the housing, a light panel, and a color display panel. The light panel and the color display panel are positioned between the housing and the cover. The light panel and the colored display panel are each selectively activated to operate in at least one of: a reflective mode, a transmissive mode, and a transflective mode.