Abstract: An electronic device having a video circuit for driving a display (100), the video circuit comprising one or more working registers (240) and a reset circuit (220, 230). The working register or registers (240) store video parameters of the display (100) and, optionally, the video circuit may be associated with one or more video synchronization signal (210). The reset circuit (220, 230) receives a periodic signal, such as the video synchronization signal or signals (210), and provides predetermined video parameters to the working register or registers (240) of the video circuit in response to receiving the periodic signal.

Abstract: Portable devices (100) that include displays (102) and are used in widely ranging ambient light conditions use selectable or adjustable optoelectronic input/output compensation functions to drive their displays. According to certain embodiments, a camera (122) or a light sensor (120) is used to measure the ambient light level, and an optoelectronic input/output compensation function that is specifically chosen based on the measured ambient light condition is used to drive the display. Furthermore, according to certain embodiments, the optoelectronic input/output compensation function is selected based on whether a display backlight (230) is turned on or off.

Abstract: An ionizer includes an alternating current (AC) voltage source having an output outputting a waveform with a positive half-cycle and a negative half-cycle, an electrode electrically coupled to the output of the AC voltage source, a reference proximate the electrode and a sensing circuit. The sensing circuit includes a return current nulling node electrically coupled to the output of the AC voltage source and the reference, a ground node separately electrically coupled to ground, a positive ion current sensor and a negative ion current sensor. The positive ion current sense node is configured to output a positive ion signal proportionate to a sensed positive ion current. The negative ion current sense node is configured to output a negative ion signal proportionate to a sensed negative ion current.

Abstract: A display device including a plurality of display elements (500) arranged in a matrix, each display element including a display pixel (510) coupled to a switch (530), each display element including an addressable latch (540) having an output coupled to a controlling input of the switch, the addressable latch having a row address input (532) and a column address input (556). In one mode of operation, at least some display elements are activated at a first rate, and other display elements are activated at a second rate less than the first refresh rate by selectively addressing the display elements.

Abstract: The preferred embodiments of the present invention provide a system and method for reducing the battery power required by a handheld device (300) that incorporates a graphical display (301). Graphical display (301), display drivers (307), LCD controller (403) and a memory (405) are optimized such that several pixels of information may be clocked simultaneously when the device is operating in a partial display mode. The optimized circuitry reduces the required refresh clock frequency (411) and thus the current drain on a device battery (319) thereby improving device operation time.

Abstract: A field emission display (100) includes a cathode plate (104) having a plurality of electron emitters (112), ballast resistors (118), an anode plate (120) having an anode (124), and a scan mode control circuit (130). The scan mode control circuit (130) is coupled to a video control circuit (160) via a scan mode switching circuit (150). The scan mode control circuit (130) cooperates with the scan mode switching circuit (150) and the video control circuit (160) to automatically switch between a single scan mode of operation and a multi-scan mode of operation.

Abstract: A method for controlling an emission current (134) in a field emission display (100) includes measuring an emission current (134), measuring a portion of the plurality of pixels receiving emission current (134) as a percentage of the plurality of pixels on the anode (138) to define a set point, comparing measured value to set point value and adjusting gate voltage to cause emission current to approach set point value. A field emission display (100) includes a control circuit (111), which has an analog-to-digital converter (150), a current controller (154), as display timing controller (151) and a gate voltage source (158). Analog-to-digital converter (150) is designed to be connected to power supply (146). Gate voltage source (158) is connected to gate extraction electrode (126) and applies thereto the offset voltage, which is manipulated by current controller (154) in response to an output signal (152) of analog-to-digital converter (150) and an output signal of display timing controller (151).