Display control device and mobile electronic apparatus

摘要

A display control device and technique for controlling displays on a display unit, in which a plurality of display segments are two-dimensionally arranged (e.g. a dot matrix type display unit), is provided. The technique is effectively applicable to a write data latch circuit of a memory for storing display data in the display control device, such as, for example, a liquid crystal display control device, a mobile electronic apparatus, etc. A display drive control technique for controlling a moving picture display mode of a display device is also provided. The display drive control circuit controls a picture display mode of a display device for displaying still pictures and moving pictures to a liquid crystal display device, such as, for example, a dot matrix type display devices, an organic EL display device, etc.

主权项

1. A display control driver on a semiconductor substrate, comprising:
a memory configured to store display data to be displayed on a display panel, the memory comprising
a plurality of memory cells arranged in row and column directions;a plurality of word lines to each of which a number of memory cells in a same row are coupled; anda plurality of bit lines arranged in a direction crossing the word lines and to which input nodes and output nodes are connected; a drive circuit configured to provide drive signals to the display panel according to data read from the memory; a first data holding circuit configured to hold the display data and configured to receive the display data in units of a number of bits and to hold the display data; a second data holding circuit coupled to the first data holding circuit and configured to receive and hold the display data supplied from the first data holding circuit; a control register configured to store a value for deciding a writing mode of the second data holding circuit and the memory, the writing mode including a consecutive writing mode and a collective writing mode; and a transfer circuit coupled between the second data holding circuit and the memory, wherein the transfer circuit is configured to transfer the display data from the second holding circuit to at least a part of the input nodes of the memory specified by the value stored in the control register based on a writing mode, wherein, in the consecutive writing mode, the display data is transferred from the first data holding circuit to the second data holding circuit in units of the number of bits consecutively, and the transfer circuit transfers the display data from the second data holding circuit is transferred to the memory in units of the number of bits consecutively, and wherein, in the collective writing mode, the display data is transferred from the first data holding circuit to the second data holding circuit in units of n times the number of bits collectively, where n is an integer larger than 1, the transfer circuit transfers the display data from the second data holding circuit to memory cells coupled to a same word line of the memory in units of n times the number of bits collectively, and the display data is successively transferred to the first data holding circuit during a same time period in which the display data is transferred from the first data holding circuit to the second data holding circuit collectively.