Abstract: The present invention discloses a light-emitting diode (LED) display driver chip and use thereof, which relates to the cross technical field of an integrated circuit and LED display. Based on an existing chip architecture with dual-latch and PWM, the present invention proposes to apply a modulation method of mixing pulse amplitude modulation (PAM) and pulse width modulation (PWM) to a driver chip architecture, to replace an existing PWM control mode, so as to obtain better uniformity of the image grayscale in a small current mode; and use a DAC small current precision control circuit to obtain a more precise current output, to meet the application performance requirements of ultra-high-density LED display, which can process data to achieve a better driving effect, and meet the application performance requirements of ultra-high-density LED display.

Abstract: The present disclosure discloses a method and system for switched display of a grayscale of a multi-line scan light-emitting diode (LED), and relates to the field of LED display technology. In view of the problems in the prior art that a multi-line scan constant-current source chip has an insufficient refresh rate, a low grayscale level, and a poor low-grayscale effect, the present disclosure provides a method during the display of relatively high grayscales, a display cycle is scrambled. During the display of relatively low grayscales, the grayscales are combined. In the present disclosure, a relatively high refresh rate and a grayscale level can still be ensured in a case of a relatively large quantity of line scans. In addition, in the case of low-grayscale display, the problems such as low-grayscale speckles, slightly dark low-grayscale, and relatively poor low-grayscale linearity are resolved, thereby improving a picture display effect.

Abstract: The present disclosure discloses a method and system for switched display of a grayscale of a multi-line scan light-emitting diode (LED), and relates to the field of LED display technology. In view of the problems in the prior art that a multi-line scan constant-current source chip has an insufficient refresh rate, a low grayscale level, and a poor low-grayscale effect, the present disclosure provides a method during the display of relatively high grayscales, a display cycle is scrambled. During the display of relatively low grayscales, the grayscales are combined. In the present disclosure, a relatively high refresh rate and a grayscale level can still be ensured in a case of a relatively large quantity of line scans. In addition, in the case of low-grayscale display, the problems such as low-grayscale speckles, slightly dark low-grayscale, and relatively poor low-grayscale linearity are resolved, thereby improving a picture display effect.

Abstract: A bandgap reference circuit and a high-order temperature compensation method are disclosed. The bandgap reference circuit includes: a starting circuit, a bias circuit and a high-order compensated bandgap reference voltage generating circuit, where a compensation method of the high-order compensated bandgap reference voltage generating circuit is to perform curvature correction by using a sub-threshold current of a CMOS transistor to obtain a high-order temperature-compensated bandgap reference voltage source circuit. The present circuit has the advantages that a manner not increasing circuit complexity can be adopted for implementation, the accuracy of a bandgap reference source can be greatly improved, and power consumption, chip area and cost are reduced.

Abstract: A bandgap reference circuit and a high-order temperature compensation method are disclosed. The bandgap reference circuit includes: a starting circuit, a bias circuit and a high-order compensated bandgap reference voltage generating circuit, where a compensation method of the high-order compensated bandgap reference voltage generating circuit is to perform curvature correction by using a sub-threshold current of a CMOS transistor to obtain a high-order temperature-compensated bandgap reference voltage source circuit. The present circuit has the advantages that a manner not increasing circuit complexity can be adopted for implementation, the accuracy of a bandgap reference source can be greatly improved, and power consumption, chip area and cost are reduced.