Glossary

通常由非晶硅 (a-Si) 制成,用作有源矩阵 LCD 上每个子像素下面的电荷存储设备的开关。

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U

USB 或 通用串行总线 (Universal Serial Bus)

个人电脑周边设备的一种灵便插口。USB 自动辨识周边设备所需的资源(比如驱动器软件和总 线带宽)。USB 无需用户参预即能运用各种资源。

USB 消除了“外壳恐惧症”——一种由打开电脑外壳安装附加周边设备所引起的害怕 感。USB同样避免了安装新周边设备时对复杂的“中断请求”(IRQ)设置的调整。

USB 清除了“端口拥塞”现象。若无 USB,个人电脑通常限于一台打印机、两个通讯端 口装置(一般是滑鼠和调制解调器),一个增强平行端口附加装置(例如扫描器或视频 照像机),以及一个戏手柄。越来越多的多媒体电脑运用的周边设备每天都出现于市 场。有了USB,多至 127 个装置同时可以运用于一台电脑上。

USB 允许“热插入”。无需关机、插入、重新起动、运行安装系统来安装周边设备。也 无需进行相反程序拔出某一装置。

简而言之,USB 将当今的“插入即怕”变成真正的“插入即用”!

插座 (Hub)

一种通用串行总线装置,为提供通用串行总线另外的连接。

插座是USB“插入即用”结构中的主要部件。下图显示一个典型的插座。插座从用户的角度简 化了USB之连接性,在廉价和简捷的基础上提供了高性能。

插座为带线接头,使USB的多附件特性得以实现。附加点则被称为端口。每一插座将单个附加 点转变成多个附加点。其总结构支持多个插座的相互串联。

插座的上游端口连接插座与主机。插座每一下游端口可与另一插座或功能装置连接。插座能够 检测、附上和拆下于每一下游端口,促使电源向下游装置的输送。每一下游端口皆能单独起 动、设置成全速或慢速。

一个插座由两部份组成:插座控制器和插座中继器。中继器是由规程控制的上游端口和下游端 口之间的枢纽。它也配有重设和暂停/继续信号的硬件支持。控制器提供接口寄存器,促成主 机间的往返通讯。插座具体状态和控制指令允许主机设置某一插座及控制其端口。

装置

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Philips 221E user manual 通常由非晶硅 a-Si 制成,用作有源矩阵 LCD 上每个子像素下面的电荷存储设备的开关。, USB 或 通用串行总线 Universal Serial Bus, 插座 Hub

221E specifications

The Philips 221E is a versatile monitor designed to meet the needs of both casual users and professionals looking for quality functionality. With its sleek design and impressive features, this monitor stands out in a crowded market.

At the heart of the Philips 221E is its 21.5-inch display, which offers a Full HD resolution of 1920 x 1080 pixels. This ensures crisp image quality, making it ideal for various applications ranging from office work to gaming and multimedia consumption. The IPS panel technology used in this monitor provides vibrant colors and wide viewing angles, allowing users to enjoy consistent image quality from different positions.

One of the key features of the Philips 221E is its slim profile and elegant design. Its ultra-narrow bezels enhance the viewing experience by maximizing screen real estate, making it a great choice for multi-monitor setups. The monitor’s compact footprint allows it to fit seamlessly into any workspace, while the adjustable stand offers tilt functionality for optimized viewing comfort.

Philips has incorporated several technologies to reduce eye strain, making the 221E suitable for extended periods of use. The Flicker-Free technology and LowBlue Mode help reduce harmful blue light emissions while minimizing flicker on the screen. These features are crucial for users who spend long hours in front of their monitors, as they help promote better eye health.

Connectivity options are another strong point of the Philips 221E. It comes equipped with multiple video inputs, including VGA and HDMI ports, allowing users to easily connect it to a variety of devices like laptops, desktops, or gaming consoles. This versatility makes it a practical choice for home and office environments.

Additionally, the Philips 221E is energy-efficient, certified with Energy Star ratings, and complies with various environmental standards. It consumes less power without compromising performance, making it an eco-friendly choice.

In summary, the Philips 221E is a feature-rich monitor that excels in image quality, design, and user comfort. With its Full HD resolution, IPS technology, eye-friendly features, and versatile connectivity, it caters to a wide range of needs, making it an excellent investment for anyone seeking a reliable display solution.