Patent ID: 9741319
Date: 2017-08-22
CPC Classifications: G06F,G09G,Y02D

Claim:
1. A memory control device which conducts (i) a writing operation in which data transferred from a host is written in a frame memory and (ii) a reading operation in which the data is read out from the frame memory so as to transfer the data to display control circuitry, the memory control device comprising: determination circuitry that determines, in a case where a readout period from start of the reading operation to end of the reading operation is shorter than a writing period from start of the writing operation to end of the writing operation, whether a distance between (i) a read pointer indicative of a current reading position in the frame memory and (ii) a write pointer indicative of a current writing position in the frame memory is less than a predetermined threshold; and line reading control circuitry that, in a case where the determination circuitry determines that the distance between the read pointer and the write pointer is less than the predetermined threshold, carries out a suspending control of reading out a line of the data which line is next to a line that has already been read, until the distance between the read pointer and the write pointer is not less than the predetermined threshold; wherein the frame memory is a single memory which stores image data corresponding to one frame, and the line reading control circuitry carries out the suspending control by extending a front porch period of a horizontal sync signal which triggers start of a reading operation of each line of the data.