Method for realizing on screen display

Abstract

The invention discloses a method for realizing on screen display. The method comprises the following steps of: inputting a press key command through an OSD (On Screen Display) interface; computing through an LEON3 microprocessor to obtain OSD pixel data needing to be written into a display memory; writing the OSD pixel data into the display memory through an OSD data controller and a display memory data flow controller in sequence; processing video data input from a video connector by a video input module and writing the video data into the display memory by the display memory data flow controller; and sequentially reading the video data and the OSD pixel data from the display memory by a video output processing module and outputting to a display terminal, wherein the OSD interface adopts a page row design mode and the OSD interface comprises a primary menu bar, secondary menu bars and a bottom edge bar; the primary menu bar comprises a plurality of icon elements and all set items are classified into the different icon elements; and each icon element corresponds to one secondary menu bar, each secondary menu bar comprises the setting items of similar attributes, and the bottom edge bar belongs to an information prompting bar.

Description

Technical field [0001] The present invention relates to the technical field of digital video processing, in particular, to a method for implementing on-screen display of icons and characters. Background technique [0002] OSD (on screen display) is a screen display technology used to display characters, graphics and images on the terminal, providing a friendly man-machine interface to facilitate user interaction with the terminal. On-screen display OSD technology is widely used in the field of industrial control (display the real-time status of various sensors on the display terminal, such as time or temperature, etc.) and the field of consumer electronics (such as the operation interface of TV and digital cameras), especially in the field of consumer electronics Since consumers prefer the gorgeous operating world, various on-screen display technologies have developed rapidly. It can be said that on-screen display technology has gradually become an indispensable technical compone...

AI Technical Summary

Problems solved by technology

However, this method has the disadvantage of not being able to specify a color for each pixel. Later, on the basis of this method, the designer designed a method of merging multiple display buffers to realize multi-color characters. The advantage of character OSD is that it can The hardware requirements are low, and it can be implemented on a low-speed MCU. Usually, LCD monitors and low-end TVs use this method to implement OSD.

[0004] Another method is to transplant the existing graphics library (such as Qt, Mini GUI) to the operating system, and use the operating system to manage the hardware. This method can achieve a more gorgeous OSD interface and is also convenient for porting, but running an operating system requires A high-speed CPU and a memory chip with a larger capacity can only implement OSD in this way in some high-end flat-panel TVs.

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