Liquid crystal display apparatus
AssigneeSeiko Epson Corporation
InventorsMinoru Niimura, Takashi Kimura, Katsumi Tsukada, Hirotsuna Miura
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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.
Claims8
A liquid crystal display apparatus comprising:
- a liquid crystal display panel equipped with a common driving driver and a line driving driver;
- a device that transfers display data to the liquid crystal display panel;
- a semiconductor memory that retains data;
- and
- an interface device for a central processing unit;
- a unified memory architecture that the semiconductor memory retains execution code and data for the central processing unit and display data for the device that transfers display data to the liquid crystal display panel;
- and
- the device that transfers display data to the liquid crystal display panel has a FIFO with a depth of a plurality of words, writes display data read out from a picture display memory region in the unified memory architecture memory into the FIFO, and transfers display data from the FIFO at a timing required by the liquid crystal panel to make a timing of reading out display data from the unified memory architecture region and a timing of transferring display data to the liquid crystal panel asynchronous to each other, whereby a band for the unified memory architecture memory can be effectively used.
A liquid crystal display apparatus comprising:
- a liquid crystal panel equipped with a common driving driver and a line driving driver;
- a device that transfers display data to the liquid crystal panel;
- a semiconductor memory that retains data;
- and
- an interface device for a central processing unit, the liquid crystal display apparatus,
- wherein the semiconductor memory retains a central processing unit execution code and data, and display data for the device that transfers display data to the liquid crystal display panel, the line driving driver has a display data storage memory mounted thereon, and the device that transfers display data to the liquid crystal display panel detects that data in a picture display memory region set in a unified memory architecture memory within the semiconductor memory can be rewritten, obtains display data from the semiconductor memory, and writes the display data in a memory of the line driving driver.
Dependencies are inferred from the claim text.