Methods can include using a doorbell to wirelessly communicate with a remotely located computing device. Doorbells can include a speaker, a microphone, a camera, and a button to sound a chime. A doorbell shipping mode can detect whether the doorbell is electrically coupled to an external power source. Methods can include entering a setup mode or a standby mode in response to detecting electricity from the external power source.

Doorbell communication systems and methods

Displays based on inorganic light-emitting diodes (LED) are considered as the most promising one among the display technologies for the next-generation The chip for LED display bears similar features to those currently in use for general lighting, but it size is shrunk to below 200 microns Thus, the advantages of high efficiency and long life span of conventional LED chips are inherited by miniaturized ones As the size gets smaller, the resolution enhances, but at the expense of elevating the complexity of fabrication In this review, we introduce two sorts of inorganic LED displays, namely relatively large and small varieties The mini-LEDs with chip sizes ranging from 100 to 200 μm have already been commercialized for backlight sources in consumer electronics applications The realized local diming can greatly improve the contrast ratio at relatively low energy consumptions The micro-LEDs with chip size less than 100 μm, still remain in the laboratory The full-color solution, one of the key technologies along with its three main components, red, green, and blue chips, as well color conversion, and optical lens synthesis, are introduced in detail Moreover, this review provides an account for contemporary technologies as well as a clear view of inorganic and miniaturized LED displays for the display community

Mini-LED and Micro-LED: Promising Candidates for the Next Generation Display Technology

In a display apparatus and a driving method thereof, a detector determines whether a timing controller is operated in a three-dimensional (3D) mode or a two-dimensional (2D) mode to output a first or second mode signal according to a result of the determination. A compensator compensates for a gamma value of a 3D image to be increased in response to a first mode signal when the 2D mode is converted to the 3D mode and decreases an increased gamma value to a gamma value for a 2D image in response to a second mode signal when the 3D mode is converted to the 2D mode.

Display apparatus and method of driving the same

A graphics processing system includes a graphics processor and a memory for storing data to be used by and generated by the graphics processor. In a first rendering pass, the graphics processor generates an array of graphics data and stores the generated array of graphics data in the memory. The array of graphics data generated in the first rendering pass is used in a subsequent rendering pass. In the first rendering pass, the graphics processor determines one or more regions of the array of graphics data that have a particular characteristic, and generates information indicative of the one or more regions. In the subsequent rendering pass, the graphics processor uses the information indicative of the one or more regions to control the reading of the array of graphics data when it is to be used in the subsequent rendering pass.

Graphics processing systems

Backlight systems dominate the power requirements of battery-operated hand-held devices with color thin-film transistor (TFT), liquid crystal displays (LCDs). We introduce dynamic luminance scaling of the backlight with appropriate image compensation. Dynamic backlight luminance scaling (DLS) keeps the perceived intensity or contrast of the image as close as possible to the original while achieving significant power reduction. DLS compromises quality of image between power consumption, which fulfills a large variety of user preferences in power-aware multimedia applications. DLS saves 20% to 80% of power consumption of the backlight systems while keeping a reasonable amount of image quality degradation.

DLS: dynamic backlight luminance scaling of liquid crystal display

An LCD (Liquid Crystal Display) is a standard display device for hand-held embedded systems. Today, color TFT (Thin-Film Transistor) LCDs are common even in cost-effective equipments. An LCD display system is composed of an LCD panel, a frame buffer memory, an LCD and frame buffer controller, and a backlight inverter and lamp. All of them are heavy power consumers, and their portion becomes much more dominant when running interactive applications. This is because interactive applications are often triggered by human inputs and thus result in a lot of slack time in the CPU and memory system, which can be effectively used for dynamic power management. In this paper, we introduce low-power LCD display schemes as a system-level approach. We accurately characterize the energy consumption at the component level and minimize energy consumption of each component without appreciable display quality degradation. We develop several techniques such as variable-duty-ratio refresh, dynamic-color-depth control and backlight luminance dimming with brightness compensation or contrast enhancement.

/pdf/low-power-color-tft-lcd-display-for-hand-held-embedded-3wn1orlxps.pdf

Low-power color TFT LCD display for hand-held embedded systems

A memory system is provided with a processor, a main memory, and a flash memory. Performance of the memory system is improved through achievement of speed-up and high data reliability. The memory system includes a nonvolatile memory device and a controller configured to drive a control program to control the nonvolatile memory device. The control program executes a second access operation for the nonvolatile memory device even before a first access operation to the nonvolatile memory device is completed.

Memory system and method of accessing a semiconductor memory device

Thin-film transistor liquid-crystal displays are systems widely used to support full-featured multimedia. For such systems, backlight is a major source of power dissipation. This article introduces a backlight power management framework and explores trade-offs in the extended dynamic-luminance-scaling design space in terms of energy reduction, performance penalty, and image quality.

/pdf/a-backlight-power-management-framework-for-battery-operated-hhz6rwxnp4.pdf

A backlight power management framework for battery-operated multimedia systems

A storage device includes storage media and a controller. The controller includes a de-duplication table that manages hash information for data stored in the storage media, and compares hash information for received write-requested data with hash information managed by the de-duplication table to determine whether the write-requested data is duplicate data.

Hojun Shim

Papers

DLS: dynamic backlight luminance scaling of liquid crystal display

Low-power color TFT LCD display for hand-held embedded systems

Memory system and method of accessing a semiconductor memory device

A backlight power management framework for battery-operated multimedia systems

Storage device and operating method eliminating duplicate data storage