Method of driving display apparatus and plasma display apparatus

A method of driving a display apparatus, in which a frame comprises n subfields, each subfield has at least an address period to select cells to be displayed and a light period to light the selected cells, and a gradation scale is represented by combining the subfields to be lit among said plural subfields, wherein subfields of Bn brightness and Bn−1 brightness, when a brightness of said n subfields is assumed to be Bi (i=1−n;

• B1≦B2 . . . Bn−1≦Bn), are arranged at an interval of about half a length of said frame, wherein the brightness of each subfield is determined by a number of lit pulses in said light period, and when a total number of sustain pulses in the frame is varied, an original clock frequency, which generates an execute signal at least either in said address period or in said light period, is varied.

A method of driving a display apparatus, in which a frame comprises plural subfields, each subfield has at least an address period to select cells to be displayed and a light period to light the selected cells, and a gradation scale is represented by combining the subfields to be lit among said plural subfields, wherein when a total number of sustain pulses in the frame is varied, an original clock frequency, which generates an execute signal at least either in said address period or said light period, is varied.

A display apparatus displaying a gradation scale by a subfield method in which a frame comprises n subfields, each subfield has at least an address period to select cells to be displayed and a light period to light the selected cells, and the gradation scale is represented by combining subfields to be lit among said n subfields such that subfields of Bn brightness and Bn−1 brightness, when a brightness of said n subfields is assumed to be Bi (i=1−n;

• B1≦B2 . . . Bn−1≦Bn), are arranged at an interval of about half a length of said frame, wherein subfields of Bn−2 brightness and Bn−3 brightness among said n subfields are arranged at the interval of about half the length of said frame so that each of the subfields of the Bn−2 brightness and the Bn−3 brightness is positioned almost at a midpoint between two most brightness-weighted subfields.

A display apparatus displaying a gradation scale by a subfield method in which a frame comprises n subfields, each subfield has at least an address period to select cells to be displayed and a light period to light the selected cells, and the gradation scale is represented by combining subfields to be lit among said n subfields such that subfields of Bn brightness and Bn−1 brightness, when a brightness of said n subfields is assumed to be Bi (i=1−n;

• B1≦B2, . . . Bn−1≦Bn), are arranged at an interval of about half a length of said frame, wherein the brightness of each subfield is determined by a number of sustain pulses in said light period, and when a total number of lit pulses in the frame is varied, an original clock frequency, which generates an execute signal at least either in said address period or in said light period, is varied.

A display apparatus displaying a gradation scale by a subfield method in which a frame comprises plural subfields, each subfield has at least an address period to select cells to be displayed and a light period to light the selected cells, and the gradation scale is represented by combining subfields to be lit among said plural subfields such that when a total number of sustain pulses in the frame is varied, an original clock frequency, which generates an execute signal at least either in said address period or said light period, is varied.