公开(公告)号：US20150348487A1

公开(公告)日：2015-12-03

申请号：US14501432

申请日：2014-09-30

Applicant: Apple Inc.

Inventor： Fenghua Zheng ,  Andrew P. Aitken

IPC: G09G3/36

CPC classification number: G09G3/3611 ,  G09G2310/08 ,  G09G2330/027 ,  G09G2330/04

Abstract: Display driver circuitry loads data into display pixels. A regulator produces a power supply voltage for display driver circuitry that is measured by a monitor circuit. The monitor circuit asserts a mode selection signal in response to detection of a drop in power supply voltage during a power-down event. The display driver circuitry contains mode selection circuitry that is controlled by the mode selection signal. The mode selection circuit allows a controlled parallel driver shutdown sequence. During normal operation, the mode selection signal is deasserted and the display driver circuitry loads image data for the display into the display pixels. When the mode selection signal is asserted, mode selection circuitry and other circuitry in the display driver circuitry continue to operate during the power down so as to load safe data into the display pixels to avoid damaging the display when the display has been powered off.

Abstract translation: 显示驱动电路将数据加载到显示像素中。 调节器产生由监视器电路测量的显示驱动器电路的电源电压。 响应于在断电事件期间检测到电源电压的下降，监视电路断言模式选择信号。 显示驱动器电路包含由模式选择信号控制的模式选择电路。 模式选择电路允许控制的并行驱动器关机顺序。 在正常操作期间，模式选择信号被断言，并且显示驱动器电路将显示器的图像数据加载到显示像素中。 当模式选择信号被断言时，显示驱动器电路中的模式选择电路和其他电路在掉电期间继续运行，以便将安全数据加载到显示像素中，以避免当显示器被断电时损坏显示器。