1.5 Basic Definitions

Pixel – One dot of color data on an LCD.

Refresh Rate — Defined in Hertz (Hz), the rate at which the LCD panel frame is being redrawn per second.

Resolution – Defined in horizontal by vertical dimensions, this refers to the number of pixels a certain display panel contains. For example, a QVGA LCD panel that is 320x240 pixels has a horizontal pixel count of 320 and a vertical pixel count of 240.

Pixel Clock (PCLK) – LCD panels use this signal to synchronize the sampling of incoming color data. The clock signal needs to be faster for higher resolutions so that all pixels of a frame can be clocked.

Frame Buffer – Volatile memory where pixel color data is stored for the purposes of refreshing an LCD screen of a certain resolution.

Pixel Throughput – Speed at which a pixel can be redrawn. The time to draw an entire frame would be pixel throughput multiplied by the LCD screen resolution.

Color Depth – Defines how many possible colors a pixel can be drawn. Commonly represented in bits per pixel (bpp), a common color depth is 16 bpp, where the color data is represented in a 565 RGB color format. In this format, 565 represents 5 red, 6 green, and 5 blue color bits.

Bluetooth® Low Energy Stack – Layered protocol managing the wireless communication of Bluetooth LE devices.

Bluetooth® Low Energy Central – A Bluetooth LE device that initiates a connection with a Bluetooth LE peripheral by scanning for advertisements and making connection requests.

Bluetooth® Low Energy Peripheral – A Bluetooth LE device that advertises its presence to be discovered and connected to by a Bluetooth LE central device.