On-screen display device and on-screen display method thereof

Abstract

The invention relates to an on-screen display device and an on-screen display method thereof, belonging to the technical field of on-screen display. The on-screen display device comprises three modules, i.e. an icon library memory module, a character library memory module and a character index memory module which are used for OSD data storage of the current state, however, a large quantity of OSD static data of other states are stored in an external memory module, thereby significantly saving the memory of the OSD device in on-screen display. Meanwhile, the data of the external memory is transmitted to the memory module by a DMA mode without relying on the MCU, thereby significantly saving OSD device resources. With the combination and application of the on-screen display device and the on-screen display method thereof, the dynamic display or the static display can be realized under the condition with dependence on small-capacity memories.

Description

technical field

[0001] The invention belongs to the technical field of on-screen display, and in particular relates to an on-screen display device and an on-screen display method. Background technique

[0002] On-screen display technology (on-screen display, OSD), that is, the screen menu adjustment method, generally press the Menu (Menu) button to pop up a rectangular menu of information on the display's various adjustment items, through which you can adjust the display's various items. Work indicators including color, pattern, geometry, etc. are adjusted to achieve the best use status. At present, on-screen display technology has been widely used in various occasions such as flat-panel TVs, digital cameras, and DV players.

[0003] In the existing on-screen display device, all OSD data are uniformly stored in an independent memory, and all OSD data are called from one memory. For example, a font library is generally used, which contains all the character lattices to be u...

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