×

Data driver and display apparatus including the same

  • US 10,446,107 B2
  • Filed: 12/06/2017
  • Issued: 10/15/2019
  • Est. Priority Date: 08/10/2017
  • Status: Active Grant
First Claim
Patent Images

1. A data driver comprising:

  • a first latch unit for storing a second data;

    a second latch unit coupled to the first latch unit and for storing a first data, wherein the first data is previous to the second data;

    a comparator configured to receive the first data from the second latch unit and the second data from the first latch unit and to output a comparison signal by comparing the received first data with the received second data;

    a level shifter unit coupled to the second latch unit and shifting a level of the first data;

    a digital-analog converter coupled to the level shifter and for converting an output of the level shifter unit into an analog signal;

    an output unit for amplifying or buffering the analog signal of the digital-analog converter and generating a drive current having a current value, the drive current configured to drive a display panel based on a bias signal and the analog signal; and

    a bias unit receiving the comparison signal from the comparator and generating the bias signal based on the comparison signal,wherein the comparator compares one of bits of the first data and the corresponding one of bits of the second data, the comparator outputs the comparison signal having a first logical value when the first data and the second data are equal, the comparator outputs the comparison signal having a second logical value which is different from the first logical value when the first data is not equal to the second data, the output unit comprises a differential amplifier, a tail current of the differential amplifier is adjusted or maintained based on the bias signal and the current value of the drive current is adjusted or maintained based on the tail current, the current value of the drive current has a first current value when the comparison signal has the second logical value, the current value of the drive current has a second current value when the comparison signal has the first logical value, and the second current value is smaller than the first current value bias signal.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×