an input device, configured to receive input data, and configured to encode the input data according to a character encoding format to generate first update data;

a display control chip, configured to communicate with the input device for receiving the first update data, and comprising a first memory, wherein the first memory is configured to store a plurality of character images respectively corresponding to a plurality of characters of the character encoding format;

a second memory, configured to store text data; and

a display circuit;

wherein the display control chip is coupled to the second memory and the display circuit, and is configured to use the first update data to update the text data,

wherein when the display control chip reads the text data in the second memory, the display control chip is configured to:

search for a plurality of target images corresponding to the text data from the plurality of character images; and

output first display data to the display circuit according to the plurality of target images, so as to control the display circuit to display a first display picture comprising the plurality of target images.