Data driver and display apparatus including the same
First Claim
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.
1 Assignment
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Accused Products
Abstract
A data driver includes a latch unit configured to store sequential first data and second data, a comparator configured to receive the first data and the second data from the latch unit and to output a comparison signal by comparing the received first data with the received second data, a digital-analog converter configured to output an analog signal corresponding to the first data from the latch unit, an output unit configured to provide 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 configured to adjust, set or maintain the bias signal based on the comparison signal. The current value is based on the bias signal.
6 Citations
13 Claims
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1. A data driver comprising:
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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 Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of driving a display panel including gate lines, data lines and pixels connected to the gate lines and the data lines, the pixels being in a matrix including rows and columns, the method comprising:
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first data configured to drive pixels of an i-th (i being a natural number equal to or greater than
1) row of the display panel;storing second data configured to drive pixels of an (i+1)-th row of the display panel; generating a comparison signal; level shifting a level of the first data; converting an output of the level shifted first data into an analog signal; amplifying or buffering the analog signal and generating a drive current having a current value using a differential amplifier to drive pixels of the (i+1)-th row of the display panel based on a bias signal and the analog signal; and generating the bias signal based on the comparison signal, wherein; generating the comparison signal comprises; comparing one of bits of the first data and the corresponding one of bits of the second data; outputting the comparison signal having a first logical value when the first data and the second data are equal; and outputting 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, 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, when amplifying or buffering the analog signal and generating a drive 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. - View Dependent Claims (11, 12, 13)
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Specification