Abstract: A display device includes a host, a control unit, and a display unit. The control unit receives host data from the host and then generates input data. The control unit includes first, second, and third memories and an arbiter. The first memory stores the input data to serve as first stored data. The second memory stores second stored data and outputs it for generating output data. The third memory stores third stored data. When the amount of the first stored data is greater than a first threshold value, the arbiter performs a writing operation to write the first stored data into the third memory. When the amount of the second stored data is lower than a second threshold value, the arbiter performs a reading operation to read the third stored data to being written into the second memory. The display unit displays images according to the output data.