GRAY COUNTER AND IMAGE SENSOR INCLUDING THE SAME

An image sensor includes a pixel sensor that senses an incident light and outputs a sampling signal of an analog shape, a sampler that compares the sampling signal and a ramp signal and outputs a comparison signal being time-axis length information, and a gray counter that counts a length of the comparison signal in synchronization with a clock signal and outputs a digital value. The gray counter includes a first flip-flop that divides the clock signal by 2 and generates a first gray code signal, a second flip-flop that delays a first data signal being a four-divided signal of the clock signal and outputs a second gray code signal, and a third flip-flop that delays the second gray code signal being two-divided and outputs a third gray code signal. 一种图像传感器包括：像素传感器，所述像素传感器感测入射光并且输出具有模拟形状的采样信号；采样器，其将所述采样信号和斜坡信号进行比较，并且输出作为时间轴长度信息的比较信号；以及格雷计数器，所述格雷计数器与时钟信号同步地计数所述比较信号的长度，并且输出数字值。所述格雷计数器包括：第一触发器，所述第一触发器将所述时钟信号以2进行分频，并且生成第一格雷码信号；第二触发器，所述第二触发器使作为所述时钟信号的四分频信号的第一数据信号延迟，并且输出第二格雷码信号；以及第三触发器，所述第三触发器使被二分频的所述第二格雷码信号延迟，并且输出第三