1753-IB16
1753-IB16
1753-IB16
此前,触摸屏设备采用气隙或屏蔽层来保护触摸传感器不受显示屏噪声耦合至接收电极的影响。不过,这些解决方案会增加厚度和成本(4英寸显示屏的屏蔽层增加了多达1.00美元的成本)。现在,随着设备变得越来越薄,气隙和屏蔽层都被取消,而且触摸传感器采用光学透明胶(OCA)直接连接至显示屏。这就导致传感器的接收电极更靠近噪声较高的VCOM层,从而就会缩短“d”、增加电容,并耦合更多噪声。由于OCA(电介质常量 为3)取代气隙(电介质常量 为1),因此电容会进一步提升。轻薄式产品的下一个发展趋势就是触摸传感器的部分或全部都需要集成在显示屏中,也就是所谓的in-cell(内嵌式触控)、On-cell(外挂式触控)。这样的显示屏集成协议栈会让传感器的接收电极更接近显示屏的VCOM层,从而耦合更多噪声。
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