Abstract: Display data read out from a picture display memory region within a UMA memory is written in a FIFO, and display data is transferred from the FIFO at a timing required by a liquid crystal panel, wherein a timing of reading out display data from the UMA region and a timing of transferring display data to the liquid crystal panel are made asynchronous to each other. Also, upon detection of writing in a display data region, display data for one picture frame is transferred to the liquid crystal panel, whereby the reduction in the bandwidth for CPU's memory accesses to the UMA is prevented, and the reduction in the overall power consumption of the display system is realized.

Abstract: A mobile phone 10 in accordance with the present invention includes a host CPU 11, a display engine 12 and a liquid crystal display device 13. Also, the display engine 12 is equipped with a host interface 14, a command interrupt logic circuit 15, a data processing section 16 and a liquid crystal drive apparatus 17. Upon reception of video images or the like, the host CPU 11 is connected to the data processing section 16, and upon completion of reception of video images, the host CPU 11 is connected to the liquid crystal drive apparatus 17 such that higher level functions can be added while maintaining the conventional host interface.

Abstract: A semiconductor memory is used to retain execution code and data for a CPU and display data for a liquid crystal controller, also used as a temporary work memory to be used when moving picture data such as MPEG is subject to a decoding process, and also used to retain decoded moving picture data.

Abstract: Display data read out from a picture display memory region within a UMA memory is written in a FIFO, and display data is transferred from the FIFO at a timing required by a liquid crystal panel, wherein a timing of reading out display data from the UMA region and a timing of transferring display data to the liquid crystal panel are made asynchronous to each other. Also, upon detection of writing in a display data region, display data for one picture frame is transferred to the liquid crystal panel, whereby the reduction in the bandwidth for CPU's memory accesses to the UMA is prevented, and the reduction in the overall power consumption of the display system is realized.

Abstract: A printing paper detection apparatus, which may be embodied in a printer, detects a paper feed amount of printing paper by performing an image recognition process on image data for the printing paper. Such a printer is equipped with a print head, a head shift mechanism section, a light emitting section, a paper feed mechanism section, an image sensor section, and a control apparatus. The image recognition process is performed on image data of the printing paper to thereby detect the paper feed amount.

Abstract: A mobile phone 10 in accordance with the present invention includes a host CPU 11, a display engine 12 and a liquid crystal display device 13. Also, the display engine 12 is equipped with a host interface 14, a command interrupt logic circuit 15, a data processing section 16 and a liquid crystal drive apparatus 17. Upon reception of video images or the like, the host CPU 11 is connected to the data processing section 16, and upon completion of reception of video images, the host CPU 11 is connected to the liquid crystal drive apparatus 17 such that higher level functions can be added while maintaining the conventional host interface.