Display apparatus and pixel voltage driving method thereof

Abstract

A display apparatus includes a pixel array, a data line and a data driver. The pixel array has adjacent first and second pixels disposed in different rows. The data line transmits first and second pixel voltages to be written into the first and second pixels respectively. The first and second pixel voltages are employed to illustrate a same frame. The data driver is utilized for generating the first and second pixel voltages furnished to the data line based on input image data. The data driver includes a voltage analysis unit and a voltage setting unit. The voltage analysis unit is used for calculating a voltage difference between the first and second pixel voltages, and for comparing the voltage difference with a preset value so as to generate a control signal. The voltage setting unit is utilized for setting the voltage of the data line according to the control signal.

1 . A pixel voltage driving method for use in a display apparatus having adjacent first and second pixels disposed in different rows, the pixel voltage driving method comprising:
 providing a first pixel voltage and a second pixel voltage to be written into the first and second pixels respectively, wherein the first and second pixel voltages are employed to illustrate a same frame;   calculating a voltage difference between the first and second pixel voltages, and comparing the voltage difference with a preset value for generating a comparison result; and   performing a pixel voltage driving operation for writing the second pixel voltage into the second pixel according to the comparison result.   
     
     
         2 . The pixel voltage driving method of  claim 1 , wherein the preset value is a voltage difference between a highest pixel voltage and a lowest pixel voltage. 
     
     
         3 . The pixel voltage driving method of  claim 1 , wherein the preset value is half a voltage difference between a highest pixel voltage and a lowest pixel voltage. 
     
     
         4 . The pixel voltage driving method of  claim 1 , wherein the step of performing the pixel voltage driving operation for writing the second pixel voltage into the second pixel according to the comparison result comprises:
 if the voltage difference being less or not greater than the preset value, retaining a voltage of a data line electrically connected to the first and second pixels in the display apparatus to be around the first pixel voltage during an interval after writing the first pixel voltage into the first pixel and before furnishing the second pixel voltage to the second pixel.   
     
     
         5 . The pixel voltage driving method of  claim 1 , wherein the step of performing the pixel voltage driving operation for writing the second pixel voltage into the second pixel according to the comparison result comprises:
 if the voltage difference being greater or not less than the preset value, setting a voltage of a data line electrically connected to the first and second pixels in the display apparatus to be a reference voltage during an interval after writing the first pixel voltage into the first pixel and before furnishing the second pixel voltage to the second pixel.   
     
     
         6 . The pixel voltage driving method of  claim 5 , wherein the reference voltage is a ground voltage. 
     
     
         7 . The pixel voltage driving method of  claim 5 , wherein the reference voltage is an intermediate voltage between a highest pixel voltage and a lowest pixel voltage. 
     
     
         8 . The pixel voltage driving method of  claim 1 , wherein the step of performing the pixel voltage driving operation for writing the second pixel voltage into the second pixel according to the comparison result comprises:
 if the voltage difference being greater or not less than the preset value, setting a voltage of a data line electrically connected to the first and second pixels in the display apparatus to be a first reference voltage during a first interval after writing the first pixel voltage into the first pixel, and setting the voltage of the data line to be a second reference voltage different from the first reference voltage during a second interval after the first interval and before furnishing the second pixel voltage to the second pixel;   wherein the first and second reference voltages are two intermediate voltages between a highest pixel voltage and a lowest pixel voltage.   
     
     
         9 . The pixel voltage driving method of  claim 1 , further comprising writing the first pixel voltage into the first pixel, wherein the step of calculating the voltage difference between the first and second pixel voltages, and comparing the voltage difference with the preset value for generating the comparison result is performed prior to writing the first pixel voltage into the first pixel. 
     
     
         10 . The pixel voltage driving method of  claim 1 , further comprising writing the first pixel voltage into the first pixel, wherein the step of calculating the voltage difference between the first and second pixel voltages, and comparing the voltage difference with the preset value for generating the comparison result is performed after writing the first pixel voltage into the first pixel. 
     
     
         11 . A display apparatus, comprising:
 a pixel array having adjacent first and second pixels disposed in different rows;   a data line, electrically connected to the first and second pixels, for transmitting a first pixel voltage and a second pixel voltage to be written into the first and second pixels respectively, wherein the first and second pixel voltages are employed to illustrate a same frame; and   a data driver, electrically connected to the data line, for generating the first and second pixel voltages based on input image data, the data driver comprising:
 a voltage analysis unit, for calculating a voltage difference between the first and second pixel voltages, and for comparing the voltage difference with a preset value so as to generate a control signal; and 
 a voltage setting unit, electrically connected to the voltage analysis unit and the data line, for setting a voltage of the data line according to the control signal. 
   
     
     
         12 . The display apparatus of  claim 11 , wherein if the voltage difference is greater or not less than the preset value, the voltage setting unit is utilized for setting the voltage of the data line to be a reference voltage according to the control signal during an interval after writing the first pixel voltage into the first pixel and before furnishing the second pixel voltage to the data line. 
     
     
         13 . The display apparatus of  claim 12 , wherein the reference voltage is an intermediate voltage between a highest pixel voltage and a lowest pixel voltage. 
     
     
         14 . The display apparatus of  claim 11 , wherein if the voltage difference is greater or not less than the preset value, the voltage setting unit is utilized for setting the voltage of the data line to be a first reference voltage according to the control signal during a first interval after writing the first pixel voltage into the first pixel, and for setting the voltage of the data line to be a second reference voltage different from the first reference voltage according to the control signal during a second interval after the first interval and before furnishing the second pixel voltage to the data line, wherein the first and second reference voltages are two intermediate voltages between a highest pixel voltage and a lowest pixel voltage. 
     
     
         15 . The display apparatus of  claim 11 , wherein if the voltage difference is less or not greater than the preset value, the voltage setting unit is utilized for retaining the voltage of the data line to be around the first pixel voltage according to the control signal during an interval after writing the first pixel voltage into the first pixel and before furnishing the second pixel voltage to the data line. 
     
     
         16 . The display apparatus of  claim 11 , wherein the preset value is a voltage difference between a highest pixel voltage and a lowest pixel voltage. 
     
     
         17 . The display apparatus of  claim 11 , wherein the preset value is half a voltage difference between a highest pixel voltage and a lowest pixel voltage. 
     
     
         18 . The display apparatus of  claim 11 , further comprising:
 a scan driver, electrically connected to the first and second pixels, for providing a first scan signal and a second scan signal for controlling writing operations of the first and second pixels respectively.   
     
     
         19 . The display apparatus of  claim 11 , wherein the voltage analysis unit calculates the voltage difference between the first and second pixel voltages, and compares the voltage difference with the preset value for generating the control signal during an interval prior to writing the first pixel voltage into the first pixel. 
     
     
         20 . A pixel voltage driving method for use in a display apparatus having adjacent first and second pixels disposed indifferent rows, the pixel voltage driving method comprising:
 providing a first pixel voltage and a second pixel voltage to be written into the first and second pixels respectively, wherein the first and second pixel voltages are employed to illustrate a same frame;   performing a pixel voltage driving operation for writing the second pixel voltage into the second pixel when a voltage difference between the first and second pixel voltages is smaller than a preset value.