Display control device
AssigneeSharp Kabushiki Kaisha
InventorsJunki ASAI, Kohji MITSUDA
Life of this patent
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Abstract
The display controller (1) includes: a DRAM (31); a SRAM (32) which consumes electric power less than the DRAM (31); an update judging section (61); a secondary compression section (70); and a decompression section (40). In a case where the update judging section (61) has judged that image data is not updated, (i) the secondary compression section (70) compresses image data and then stores compressed image data in the SRAM (32), (ii) the DRAM (31) stops a memory retaining operation, and (iii) the decompression section (40) decompresses the compressed image data and then supplies decompressed data to an LCD (3).
Claims5
A display controller comprising:
- a first memory in which image data received from a host is to be stored;
- a second memory which consumes electric power less than the first memory;
- an update judging section for judging whether or not the image data received from the host is updated;
- a compression section;
- and
- a decompression section,
- the display controller supplying the image data to a display section at a predetermined timing, and
- in a case where the update judging section has judged that the image data received from the host has not been updated,
- the compression section (i) subjecting the image data read out from the first memory to secondary compression, so that secondary compressed data is generated and then (ii) storing the secondary compressed data in the second memory,
- the first memory stopping an memory retaining operation, and
- the decompression section (i) decompressing the secondary compressed data read out from the second memory, so that secondary decompressed data is generated and then (ii) supplying the secondary decompressed data to the display section.
Dependencies are inferred from the claim text.