Control method and control device for charging time sharing

Abstract

A control method for charging time sharing in a display apparatus, which includes receiving image data including a plurality of pixel data signals corresponding to a plurality of display driving periods, each display driving period associated with pixel data signals of a respective row of the display apparatus, calculating a plurality of gray variations corresponding to the plurality of display driving periods according to the plurality of pixel data signals, adjusting the plurality of display driving periods to generate a plurality of adjusted display driving periods according to the plurality of gray variations, and generating a gate clock signal according to the plurality of adjusted display driving periods.

What is claimed is: 
     
       1. A control method for charging time sharing in a display apparatus, comprising:
 receiving image data including a plurality of pixel data signals corresponding to a plurality of display driving periods, each display driving period associated with pixel data signals of a respective row of the display apparatus; 
 calculating a plurality of gray variations corresponding to the plurality of display driving periods according to the plurality of pixel data signals; 
 adjusting the plurality of display driving periods to generate a plurality of adjusted display driving periods by comparing the plurality of gray variations; and 
 generating a gate clock signal according to the plurality of adjusted display driving periods, wherein the plurality of adjusted display driving period comprises an adjusted first display driving period and an adjusted second display driving period, an adjusted third display driving period and an adjusted fourth display driving period occurring in order and having different durations, and a total duration of the adjusted first display driving period and the adjusted second display driving period is equal to a total duration of the adjusted third display driving period and the adjusted fourth display driving period. 
 
     
     
       2. The control method of  claim 1 , wherein the step of calculating a plurality of gray variations corresponding to the plurality of display driving periods according to the plurality of pixel data signals comprises:
 for each gray variation corresponding to a respective display driving period, calculating a maximum change of gray voltage levels between the respective pixel data signals corresponding to the respective display driving period and the respective pixel data signals corresponding to a previous display driving period prior to the respective display driving period. 
 
     
     
       3. The control method of  claim 1 , wherein plurality of gray variations corresponding to the plurality of display driving periods are calculated according to the following equation:
   Vs(Tn)=Max{Δ[Xm(Tn−1)→Xm(Tn)],m=1, . . . ,M},n=1, . . . ,N
 
 where Vs(Tn) represents n-th gray variation corresponding to n-th display driving period; Tn represents n-th display driving period; Tn−1 represents a previous display driving period prior to the n-th display driving period; Xm(Tn−1) represents a respective gray voltage level of a respective pixel data signal of m-th column of the display apparatus corresponding to the previous display driving period prior to the n-th display driving period; Xm(Tn) represents a respective gray voltage level of a respective pixel data signal of m-th column of the display apparatus corresponding to the n-th display driving period; Δ(⋅) represents a delta function indicating the difference between respective gray voltage levels; Max (⋅) represents a function indicating taking a maximum of the value in the following parentheses; and n, N, m and M are positive integers, n is between 1 and N, m is between 1 and M. 
 
     
     
       4. The control method of  claim 1 , wherein the step of calculating the plurality of gray variations corresponding to the plurality of display driving periods according to the plurality of pixel data signals comprises:
 calculating a first gray variation of the plurality of gray variations corresponding to a first display driving period of the plurality of display driving periods according to pixel data signals corresponding to the first display driving period and pixel data signals corresponding to a previous display driving period prior to the first display driving period; and 
 calculating a second gray variation of the plurality of gray variations corresponding to a second display driving period of the plurality of display driving periods according to pixel data signals corresponding to the second display driving period and pixel data signals corresponding to the first display driving period, wherein the second display driving period is after the first display driving period. 
 
     
     
       5. The control method of  claim 4 , wherein the step of adjusting the plurality of display driving periods to generate the plurality of adjusted display driving periods by comparing the plurality of gray variations comprises:
 comparing the first gray variation with the second gray variation; and 
 when the first gray variation is greater than the second gray variation, increasing the first display driving period to generate the adjusted first display driving period and decreasing the second display driving period to generate the adjusted second display driving period. 
 
     
     
       6. The control method of  claim 5 , wherein the first display driving period is shorter than the adjusted first display driving period, the second display driving period is longer than the adjusted second display driving period, and the total duration of the first display driving period and the second display driving period is equal to the total duration of the adjusted first display driving period and the adjusted second display driving period. 
     
     
       7. The control method of  claim 1 , wherein the step of adjusting the plurality of display driving periods to generate the plurality of adjusted display driving periods by comparing the plurality of gray variations comprises:
 adjusting the plurality of display driving periods to the plurality of adjusted display driving periods according to a ratio of the plurality of gray variations. 
 
     
     
       8. The control method of  claim 1 , wherein each period of the gate clock signal corresponds to a respective adjusted display driving period of the plurality of adjusted display driving periods. 
     
     
       9. The control method of  claim 1 , further comprising at least one of the following:
 generating a start signal according to the gate clock signal; 
 generating an output enable signal corresponding to the plurality of adjusted display driving periods, wherein each period of the output enable signal corresponds to a respective adjusted display driving period of the plurality of adjusted display driving periods; and 
 generating a latch data signal corresponding to the plurality of adjusted display driving periods, wherein each period of the latch data corresponds to a respective adjusted display driving period of the plurality of adjusted display driving periods. 
 
     
     
       10. A control device for charging time sharing, comprising:
 a memory unit for receiving and storing image data, the image data including a plurality of pixel data signals corresponding to a plurality of display driving periods, each display driving period associated with pixel data signals of a respective row of a display apparatus; 
 a calculation unit for calculating a plurality of gray variations corresponding to the plurality of display driving periods according to the plurality of pixel data signals; 
 an adjustment unit for adjusting the plurality of display driving periods to generate a plurality of adjusted display driving periods by comparing the plurality of gray variations, wherein the plurality of adjusted display driving period comprises an adjusted first display driving period and an adjusted second display driving period, an adjusted third display driving period and an adjusted fourth display driving period occurring in order and having different durations, and a total duration of the adjusted first display driving period and the adjusted second display driving period is equal to a total duration of the adjusted third display driving period and the adjusted fourth display driving period; and 
 a control signal generation unit for generating a gate clock signal according to the plurality of adjusted display driving periods. 
 
     
     
       11. The control device of  claim 10 , wherein for each gray variation corresponding to a respective display driving period, the calculation unit calculates a maximum change of gray voltage levels between the respective pixel data signals corresponding to the respective display driving period and the respective pixel data signals corresponding to a previous display driving period prior to the respective display driving period. 
     
     
       12. The control device of  claim 10 , wherein the plurality of gray variations corresponding to the plurality of display driving periods are calculated by the calculation unit according to the following equation:
   Vs(Tn)=Max{Δ[Xm(Tn−1)→Xm(Tn)],m=1, . . . ,M},n=1, . . . ,N
 
 where Vs(Tn) represents n-th gray variation corresponding to n-th display driving period; Tn represents n-th display driving period; Tn−1 represents a previous display driving period prior to the n-th display driving period; Xm(Tn−1) represents a respective gray voltage level of a respective pixel data signal of m-th column of the display apparatus corresponding to the previous display driving period prior to the n-th display driving period; Xm(Tn) represents a respective gray voltage level of a respective pixel data signal of m-th column of the display apparatus corresponding to the n-th display driving period; Δ(⋅) represents a delta function indicating the difference between respective gray voltage levels; Max(⋅) represents a function indicating taking a maximum of the value in the following parentheses; and n, N, m and M are positive integers, n is between 1 and N, m is between 1 and M. 
 
     
     
       13. The control device of  claim 10 , wherein the calculation unit calculates a first gray variation of the plurality of gray variations corresponding to a first display driving period of the plurality of display driving periods according to pixel data signals corresponding to the first display driving period and pixel data signals corresponding to a previous display driving period prior to the first display driving period and calculates a second gray variation of the plurality of gray variations corresponding to a second display driving period of the plurality of display driving periods according to pixel data signals corresponding to the second display driving period and pixel data signals corresponding to the first display driving period, wherein the second display driving period is after the first display driving period. 
     
     
       14. The control device of  claim 13 , wherein the adjustment unit compares the first gray variation with the second gray variation, when the first gray variation is greater than the second gray variation, the adjustment unit increases the first display driving period to generate the adjusted first display driving period and the adjustment unit decreases the second display driving period to generate the adjusted second display driving period. 
     
     
       15. The control device of  claim 14 , wherein the first display driving period is shorter than the adjusted first display driving period and the second display driving period is longer than the adjusted second display driving period, and the total duration of the first display driving period and the second display driving period is equal to the total duration of the adjusted first display driving period and the adjusted second display driving period. 
     
     
       16. The control device of  claim 10 , wherein the adjustment unit adjusts the plurality of display driving periods to the plurality of adjusted display driving periods according to a ratio of the plurality of gray variations. 
     
     
       17. The control device of  claim 10 , wherein each period of the gate clock signal corresponds to a respective adjusted display driving period of the plurality of adjusted display driving periods. 
     
     
       18. The control device of  claim 10 , wherein the control signal generation unit generates at least one of a start signal, an output enable signal and a latch data signal, wherein each period of the output enable signal and the latch data signal corresponds to a respective adjusted display driving period of the plurality of adjusted display driving periods. 
     
     
       19. A control method for charging time sharing in a display apparatus, comprising:
 receiving image data including a plurality of pixel data signals corresponding to a plurality of display driving periods, each display driving period associated with pixel data signals of a respective row of the display apparatus; 
 calculating a plurality of gray variations corresponding to the plurality of display driving periods according to the plurality of pixel data signals; 
 adjusting the plurality of display driving periods to generate a plurality of adjusted display driving periods by comparing the plurality of gray variations, comprising:
 comparing a first gray variation corresponding to a first display driving period of the plurality of display driving periods with a second gray variation corresponding to a second display driving period of the plurality of display driving periods, wherein the second display driving period is neighboring to the first display driving period; and 
 when the first gray variation is greater than the second gray variation, increasing the first display driving period to generate an adjusted first display driving period and decreasing the second display driving period to generate an adjusted second display driving period; and 
 
 generating a gate clock signal according to the plurality of adjusted display driving periods. 
 
     
     
       20. A control device for charging time sharing, comprising:
 a memory unit for receiving and storing image data, the image data including a plurality of pixel data signals corresponding to a plurality of display driving periods, each display driving period associated with pixel data signals of a respective row of a display apparatus; 
 a calculation unit for calculating a plurality of gray variations corresponding to the plurality of display driving periods according to the plurality of pixel data signals; 
 an adjustment unit for adjusting the plurality of display driving periods to generate a plurality of adjusted display driving periods by comparing the plurality of gray variations; and 
 a control signal generation unit for generating a gate clock signal according to the plurality of adjusted display driving periods; 
 wherein the adjustment unit compares a first gray variation corresponding to a first display driving period of the plurality of display driving periods with a second gray variation corresponding to a second display driving period of the plurality of display driving periods, wherein the second display driving period is neighboring to the first display driving period, and when the first gray variation is greater than the second gray variation, the adjustment unit increases the first display driving period to generate an adjusted first display driving period and the adjustment unit decreases the second display driving period to generate an adjusted second display driving period. 
 
     
     
       21. A control method for charging time sharing in a display apparatus, comprising:
 receiving image data including a plurality of pixel data signals corresponding to a plurality of display driving periods, each display driving period associated with pixel data signals of a respective row of the display apparatus;   calculating a plurality of gray variations corresponding to the plurality of display driving periods according to the plurality of pixel data signals;   adjusting the plurality of display driving periods to generate a plurality of adjusted display driving periods according to the plurality of gray variations; and   generating a gate clock signal according to the plurality of adjusted display driving periods to sequentially drive the rows of pixels of the display one row by one row, wherein in each of the adjusted display driving periods, a single row of pixels of the display panel are turned on.   
     
     
       22. A control device for charging time sharing, comprising:
 a memory unit for receiving image data including a plurality of pixel data signals corresponding to a plurality of display driving periods, each display driving period associated with pixel data signals of a respective row of the display apparatus;   a calculation unit for calculating a plurality of gray variations corresponding to the plurality of display driving periods according to the plurality of pixel data signals;   an adjustment unit for adjusting the plurality of display driving periods to generate a plurality of adjusted display driving periods according to the plurality of gray variations; and   a control signal generation unit for generating a gate clock signal according to the plurality of adjusted display driving periods to sequentially drive the rows of pixels of the display one row by one row, wherein in each of the adjusted display driving periods, a single row of pixels of the display panel are turned on.   
     
     
       23. A control method for charging time sharing in a display apparatus, comprising:
 obtaining pixel data signals of respective row of the display apparatus; and 
 generating a plurality of adjusted display driving periods according to the plurality of pixel data signals; and 
 wherein the plurality of adjusted display driving periods comprises an adjusted first display driving period and an adjusted second display driving period, an adjusted third display driving period and an adjusted fourth display driving period occurring in order and having different durations, and a total duration of the adjusted first display driving period and the adjusted second display driving period is equal to a total duration of the adjusted third display driving period and the adjusted fourth display driving period. 
 
     
     
       24. A control device for charging time sharing, comprising:
 a memory unit for obtaining pixel data signals of respective row of the display apparatus; and 
 an adjustment unit for generating a plurality of adjusted display driving periods according to the plurality of pixel data signals; 
 wherein the plurality of adjusted display driving period comprises an adjusted first display driving period and an adjusted second display driving period, an adjusted third display driving period and an adjusted fourth display driving period occurring in order and having different durations, and a total duration of the adjusted first display driving period and the adjusted second display driving period is equal to a total duration of the adjusted third display driving period and the adjusted fourth display driving period. 
 
     
     
       25. A control method for a display apparatus, comprising:
 generating a plurality of adjusted display driving periods according to gray variance associated with a plurality of pixel data signals, each of the adjusted display driving periods corresponding to a respective row of the display apparatus; and   driving the respective row of the display apparatus according to the corresponding one of the adjusted display driving periods;   wherein the plurality of adjusted display driving periods comprise a first group of adjusted display driving periods occurring consecutively and a second group of adjusted display driving periods occurring consecutively, the first group of adjusted display driving periods comprises an adjusted first display driving period and an adjusted second display driving period, the second group of adjusted display driving periods comprises an adjusted third display driving period and an adjusted fourth display driving period, wherein the adjusted first display driving period, the adjusted second display driving period, the adjusted third display driving period and the adjusted fourth display driving period occurring in order and having different durations, and a total duration of the adjusted first display driving period and the adjusted second display driving period is equal to a total duration of the adjusted third display driving period and the adjusted fourth display driving period, the second group of adjusted display driving periods having a same total number of adjusted display driving periods as that of the first group of adjusted display driving periods, and a total duration of the first group of adjusted display driving periods is equal to a total duration of the second group of adjusted display driving periods.   
     
     
       26. The control method of claim 25, further comprising:
 generating a gate clock signal according to the plurality of adjusted display driving periods.   
     
     
       27. A control device of a display apparatus, comprising:
 an adjustment unit for generating a plurality of adjusted display driving periods according to gray variance associated with a plurality of pixel data signals, each of the adjusted display driving periods corresponding to a respective row of the display apparatus; and   a control signal generation unit for driving the respective row of the display apparatus according to the corresponding one of the adjusted display driving periods;   wherein the plurality of adjusted display driving periods comprise a first group of adjusted display driving periods occurring consecutively and a second group of adjusted display driving periods occurring consecutively, the first group of adjusted display driving periods comprises an adjusted first display driving period and an adjusted second display driving period, the second group of adjusted display driving periods comprises an adjusted third display driving period and an adjusted fourth display driving period, wherein the adjusted first display driving period, the adjusted second display driving period, the adjusted third display driving period and the adjusted fourth display driving period occurring in order and having different durations, and a total duration of the adjusted first display driving period and the adjusted second display driving period is equal to a total duration of the adjusted third display driving period and the adjusted fourth display driving period, the second group of adjusted display driving periods having a same total number of adjusted display driving periods as that of the first group of adjusted display driving periods, and a total duration of the first group of adjusted display driving periods is equal to a total duration of the second group of adjusted display driving periods.   
     
     
       28. The control device of claim 27, wherein the control signal generation unit generates a gate clock signal to drive the respective row of the display apparatus according to the plurality of adjusted display driving periods. 
     
     
       29. A control method for charging time sharing in a display apparatus, comprising:
 generating a plurality of adjusted display driving periods by comparing a plurality of gray variations corresponding to the plurality of display driving periods for driving a respective row of the display apparatus, wherein the adjusted display driving periods depend upon the plurality of gray variations corresponding to the plurality of display driving periods, respectively; and wherein the plurality of gray variations comprise a first gray variation corresponding to a first display driving period of the plurality of display driving periods and a second gray variation corresponding to a second display driving period of the plurality of display driving periods, wherein the second display driving period is neighboring to the first display driving period; and   comparing the first gray variation corresponding to the first display driving period with the second gray variation corresponding to the second display driving period, when the first gray variation is greater than the second gray variation, increasing the first display driving period to generate an adjusted first display driving period and decreasing the second display driving period to generate an adjusted second display driving period.   
     
     
       30. The control method of claim 29, further comprising:
 generating a gate clock signal according to the plurality of adjusted display driving periods.   
     
     
       31. A control device for charging time sharing in a display apparatus, comprising:
 an adjustment unit for generating a plurality of adjusted display driving periods by comparing a plurality of gray variations corresponding to the plurality of display driving periods for driving a respective row of the display apparatus,   wherein the adjusted display driving periods depend upon a plurality of gray variations corresponding to the plurality of display driving periods, respectively; and   wherein the plurality of gray variations comprise a first gray variation corresponding to a first display driving period of the plurality of display driving periods and a second gray variation corresponding to a second display driving period of the plurality of display driving periods, wherein the second display driving period is neighboring to the first display driving period; and   wherein the adjustment unit compares the first gray variation corresponding to the first display driving period with the second gray variation corresponding to the second display driving period, when the first gray variation is greater than the second gray variation, the first display driving period is increased to generate an adjusted first display driving period by the adjustment unit and the second display driving period is decreased to generate an adjusted second display driving period by the adjustment unit.   
     
     
       32. The control device of claim 31, wherein the control signal generation unit generates a gate clock signal to drive the respective row of the display apparatus according to the plurality of adjusted display driving periods.