CN213754718U

CN213754718U - Computer video signal OSD menu generating circuit

Info

Publication number: CN213754718U
Application number: CN202023292772.7U
Authority: CN
Inventors: 崔凯; 李博
Original assignee: Baoding Sanjin Electronic Technology Co ltd
Current assignee: Baoding Sanjin Electronic Technology Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-07-20
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a computer video signal OSD menu generating circuit, including crystal oscillator circuit, H/V synchronizing signal produces the module, OSD screen display output module and host system, the input of H/V synchronizing signal produces the module is connected to crystal oscillator circuit's output, the input of OSD screen display output module and display is connected respectively to H/V synchronizing signal produces the output of module, the RGB signal connection display's of OSD screen display output module's output input, the electricity is connected between host system and the OSD screen display output module; the main control module is connected with an external keyboard used for inputting control instructions through a USB or PS2 interface, and the output end of the external keyboard is connected with the input end of the main control module. The utility model discloses a HVV synchronizing signal produces the module and carries out the field generation, can generate the HV synchronizing signal of high resolution to signal quality is stable, uses special chip S5D2508A to produce OSD data, and the picture of production is stable lifelike, and the colour is gorgeous.

Description

Computer video signal OSD menu generating circuit

Technical Field

The utility model relates to a computer signal processing technology field, especially a computer video signal OSD menu production circuit.

Background

The OSD menu on the integrated KVM can quickly know the state and the current switching relation of video input signals in real time by looking up the OSD menu, can also quickly switch signal sources and edit the names of input signal sources, and is greatly convenient for operators to operate and manage multiple input signal sources. In the current market, some integrated KVMs have no OSD menu function at all, and for integrated displays with OSD menu function, the generated SOD menus are generally low in resolution ratio, generally 640 × 480, poor in display effect and unstable in display. The SOD menu generating circuit is usually built by using a 74 series chip traditionally, and can be built by using a plurality of chips, and because of differences among devices, signals are transmitted among printed boards to cause loss and interference, so that the generated OSD menu cannot achieve higher resolution and has poorer stability.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that needs solve provides a computer video signal OSD menu production circuit, can produce the high-quality OSD menu interface of high resolution.

In order to solve the technical problem, the utility model adopts the following technical proposal.

A kind of computer video signal OSD menu generating circuit, including the crystal oscillator circuit used for producing H count signal, H/V synchronizing signal generating module used for producing H/V synchronizing signal, OSD screen display output module used for driving the display to display the standard VGA signal and main control module used for controlling each module to coordinate the movements, the carry-out terminal of the crystal oscillator circuit connects the input end of the H/V synchronizing signal generating module, the carry-out terminal of the H/V synchronizing signal generating module connects OSD screen display output module and input end of the display separately, RGB signal that the carry-out terminal of OSD screen display output module outputs connects the input end of the display, the main control module is connected electrically with OSD screen display output module; the main control module is connected with an external keyboard used for inputting control instructions through a USB or PS2 interface, and the output end of the external keyboard is connected with the input end of the main control module.

The above-mentioned computer video signal OSD menu generating circuit, the H/V synchronizing signal generating module includes H line synchronizing signal generating circuit for generating H synchronizing signal and V field synchronizing signal generating circuit for generating 60Hz V synchronizing signal by H synchronizing signal, the input end of the H line synchronizing signal generating circuit is connected with the output end of the crystal oscillator circuit, the output end of the H line synchronizing signal generating circuit is respectively connected with the input ends of the display and the V field synchronizing signal generating circuit, and the output end of the V field synchronizing signal generating circuit is respectively connected with the input ends of the display and the OSD screen display output module.

The OSD display output module comprises an image output circuit for generating OSD analog signals and a switching control circuit for switching a display to display a background image and an OSD menu, wherein the output end of the image output circuit is connected with the input end of the switching control circuit, and the output end of the switching control circuit is connected with the controlled end of the display.

In the circuit for generating the computer video signal OSD menu, the main control module is connected with the input end of the image output circuit through an I2C bus.

Due to the adoption of the technical scheme, the utility model has the following technical progress.

The utility model discloses a HVV synchronizing signal produces the module and carries out the field generation, can generate the HV synchronizing signal of high resolution to signal quality is stable, uses special chip S5D2508A to produce OSD data, and the picture of production is stable lifelike, and the colour is gorgeous.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a circuit diagram of an H/V synchronization signal generation module according to the present invention;

fig. 3 is a circuit diagram of the OSD output module according to the present invention;

fig. 4 is a circuit diagram of the main control module of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

A computer video signal OSD menu generating circuit is shown in figure 1, and comprises a crystal oscillator circuit, an H/V synchronous signal generating module, an OSD screen display output module, a display, a main control module and an external keyboard. The output end of the crystal oscillator circuit is connected with the input end of the H/V synchronous signal generation module, the output end of the H/V synchronous signal generation module is respectively connected with the input ends of the OSD screen display output module and the display, the RGB signal output by the output end of the OSD screen display output module is connected with the input end of the display, the main control module is electrically connected with the OSD screen display output module, and the output end of the external keyboard is connected with the input end of the main control module.

The crystal oscillator circuit is used for generating an H counting signal of a target resolution (1280 1024 60), and the generated counting signal is sent to the H/V synchronous signal generation module to generate an H/V synchronous signal.

The H/V synchronous signal generating module has the main function of generating a set of standard H/V synchronous signals when no external input video source exists and transmitting the set of standard H/V synchronous signals to the OSD screen display output module and the display.

The H/V synchronizing signal generating module comprises an H line synchronizing signal generating circuit and a V field synchronizing signal generating circuit, the H line synchronizing signal generating circuit is used for generating an H synchronizing signal according to an H counting signal of the crystal oscillator circuit, the V field synchronizing signal generating circuit generates a 60Hz V synchronizing signal according to the H synchronizing signal, the input end of the H line synchronizing signal generating circuit is connected with the output end of the crystal oscillator circuit, the output end of the H line synchronizing signal generating circuit is respectively connected with the input ends of the display and the V field synchronizing signal generating circuit, and the output end of the V field synchronizing signal generating circuit is respectively connected with the input ends of the display and the OSD screen display output module.

The utility model provides a circuit diagram of HV synchronizing signal produces module is shown in fig. 2, adopts EPM7064SLC chip, produces the H count signal of target resolution ratio (1280 1024 60) according to the crystal oscillator of input by H line synchronizing signal producing circuit earlier, produces the H synchronizing signal of standard, produces 60 Hz's V synchronizing signal by V field synchronizing signal producing circuit again, exports for OSD screen display output module.

The OSD screen display output module is used for driving the display to display standard VGA signals. The image output circuit is used for generating OSD analog signals, the switching control circuit is used for switching a real background image and an OSD menu of the display, the output end of the image output circuit is connected with the input end of the switching control circuit, and the output end of the switching control circuit is connected with the controlled end of the display.

The utility model provides a circuit diagram of OSD on-screen display output module is shown in FIG. 3, adopts chip S5D2508A, and this chip is dedicated OSD analog signal production chip, produces OSD analog signal data through this chip, then exports the display interface through a set of alternative switching control circuit who constitutes by OPA 875. The chip S5D2508A can also generate an alternative circuit for controlling an analog signal for a high-speed pulse signal, so that the alternative circuit can perform a high-speed switching operation. Thereby outputting a standard VGA display signal to the display.

The main control module is used for controlling the coordination of all modules, is connected to the input end of the image output circuit through an I2C bus, and controls a register in the S5D2508A to set the content, color, size and the like of output OSD data. The OSD menu is connected with an external keyboard through a USB or PS2 interface, and the OSD menu is operated and controlled by receiving data of the external keyboard. The utility model discloses well host system' S circuit diagram is shown in FIG. 4, adopts STC12C5A32S2 singlechip, controls each module work, makes background image and OSD menu high-speed wheel flow display on the display.

The utility model discloses HV synchronizing signal who produces the module high resolution generates HV synchronizing signal, then accomplish the image output of OSD menu through ASIC S5D2508A, main control module realizes the formation of menu through the inside register of I2C bus control S5D2508A, realize the display in turn of background image and OSD menu by OPA875, display control is responsible for by the switching control signal in turn of S5D2508A output.

Claims

1. A computer video signal OSD menu generation circuit, characterized by: the LCD comprises a crystal oscillator circuit for generating an H counting signal, an H/V synchronous signal generating module for generating an H/V synchronous signal, an OSD screen display output module for driving a display to display a standard VGA signal and a main control module for controlling the coordination action of all the modules, wherein the output end of the crystal oscillator circuit is connected with the input end of the H/V synchronous signal generating module; the main control module is connected with an external keyboard used for inputting control instructions through a USB or PS2 interface, and the output end of the external keyboard is connected with the input end of the main control module.

2. The circuit for generating OSD menus of computer video signals as claimed in claim 1, wherein: the H/V synchronizing signal generating module comprises an H line synchronizing signal generating circuit for generating H synchronizing signals and a V field synchronizing signal generating circuit for generating 60Hz V synchronizing signals by the H synchronizing signals, the input end of the H line synchronizing signal generating circuit is connected with the output end of the crystal oscillator circuit, the output end of the H line synchronizing signal generating circuit is respectively connected with the input ends of the display and the V field synchronizing signal generating circuit, and the output end of the V field synchronizing signal generating circuit is respectively connected with the input ends of the display and the OSD screen display output module.

3. The circuit for generating OSD menus of computer video signals as claimed in claim 1, wherein: the OSD screen display output module comprises an image output circuit for generating an OSD analog signal and a switching control circuit for switching a display to display a background image and an OSD menu, wherein the output end of the image output circuit is connected with the input end of the switching control circuit, and the output end of the switching control circuit is connected with the controlled end of the display.

4. A computer video signal OSD menu generation circuit as claimed in claim 3, wherein: the main control module is connected with the input end of the image output circuit through an I2C bus.