KR20000028473A - Device for processing on-screen-display function in video system - Google Patents

Abstract

PURPOSE: A device for processing an OSD(On Screen Display) function in a video system is provided to give a stable OSD screen by synchronizing a data transmitting speed of a micom and a data processing speed of an OSD driver. CONSTITUTION: A device for processing an OSD(On Screen Display) function in a video system comprises a storage unit(300), a vertical/horizontal synchronization detector(100), a micom(200), buffer memories(710,720,730), a data distributer(600), a buffer selector(800), an OSD driver(400), and a displayer(500). The storage unit stores preset OSD information or OSD information extracted from a broadcasting signal. The vertical/horizontal synchronization detector detects a vertical/horizontal synchronization signal from a video signal. The micom withdraws the OSD information corresponding to a user's request from the storage unit, and generates an OSD driving control signal, a data distribution control signal, and a buffer selection signal, which are corresponding to the withdrawn OSD information and the vertical/horizontal synchronization signal. The buffer memories temporarily store the OSD information from the micom. The data distributer selectively supplies the OSD information to the buffer memories by the data distribution control signal. The buffer selector selectively outputs the OSD information applied from the buffer memories by the buffer selection signal. The OSD driver processes the applied OSD information by the OSD driving signal, and composes as the OSD screen overlapped on the video signal. The displayer displays the OSD screen.

Description

OS Processing Unit of Imaging Equipment

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on screen display (OSD) of a video system, and more particularly, to an on screen of a video device suitable for preventing OSD screen degradation due to data overflow. It relates to a display device.

As you know, television, high definition television (HDTV), satellite broadcasting receiver, video cassette recorder (VCR) and video compact disc (VCD), etc. The same video device provides an OSD function for the user's convenience, and such an OSD function displays text information about the function when the user wants to use a predetermined function provided by the above-described video devices. Or as a means of facilitating the user's use of the video device by displaying the information screen (i.e., OSD screen) by combining it with a blue-back screen, such as hardware for such an OSD function, i.e., an OSD processing apparatus. Provided by

Hereinafter, a general OSD processing apparatus will be described with reference to FIG. 1.

Referring to FIG. 1, a general OSD processing apparatus includes a vertical and horizontal synchronization detector 100, a microcomputer 200, a storage unit 300, an OSD driver 400, and a display unit 500, and operates as follows. .

First, when a predetermined key signal requesting a predetermined OSD screen is applied to the microcomputer 200 by a user's manipulation, the microcomputer 200 extracts predetermined information from the storage unit 300 in response to the applied key signal. At this time, the vertical and horizontal synchronization detection unit 100 detects the vertical synchronization signal and the horizontal synchronization signal inserted into the image signal, and provides the detected signal to the microcomputer 200.

Accordingly, the microcomputer 200 generates the OSD drive control signal by referring to the synchronization signals provided from the vertical and horizontal sync detectors 100, provides the generated OSD drive control signals to the OSD driver 400, and stores the OSD. The data extracted from the 300 (indicated by a dotted line in FIG. 1) is also provided to the OSD driver 400.

The OSD driver 400 configures an OSD screen based on data provided from the microcomputer 200, and then synthesizes the OSD screen with an image signal applied from an image receiving means (not shown) based on the OSD driving control signal. To provide.

The display unit 500 displays an OSD screen on a blue back screen or an OSD screen on a video signal.

The apparatus of the conventional OSD processing, by the above-described operation process, wants to provide the OSD function provided by the conventional video device, for example, the OSD screen for setting the current time, reservation recording setting and cancellation, channel change, etc. Was performed.

However, with the development of video equipment, its operation becomes complicated, and the service demands of users who are accustomed to advanced services also increase. Therefore, developers of each video equipment strive to enhance user convenience by enhancing the user interface. Doing.

As a result, the interface function is greatly improved not only for video devices developed in recent years such as high-definition televisions, satellite broadcast receivers, and video compact discs, but also for conventional video devices such as TVs and VCRs. 'Teletext' function that provides information service, 'Facsimile service' function that broadcasts information such as letters, figures, photos, etc. on paper, and 'Audio' that broadcasts a combination of high definition still images and high quality voice. It is being developed to provide various services (OSD screens) such as 'Graphics' function, channel ID, program name, program contents, airing time, and 'program guide service' that informs the presence of paid broadcasting.

However, in the above-described service, since the OSD screen configuration is complicated by the increase of the information, the data for configuring the OSD screen, for example, the size, start position and end position, contrast, transparency, The amount of data such as OSD header information having information on color and the like is increased. Also, as the number of channels provided such as satellite broadcasting or cable broadcasting increases, basic information (for example, channel information, program information, etc.) increases.

As a result, since the data processing speed of the OSD driver 400 is limited, an overflow occurs in which the OSD driver 400 cannot process all of the data provided by the microcomputer 200, thereby degrading the OSD screen. There is a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object thereof is to provide an OSD processing apparatus for an imaging apparatus configured to synchronize the data transfer rate from the microcomputer 200 with the data processing speed of the OSD driver. have.

In order to achieve the above object, in the present invention, in the OSD processing apparatus of the video device to configure the OSD screen to be superimposed on the video signal by processing the on-screen display (OSD) information included in the broadcast signal or preset, A storage unit for storing OSD information or OSD information extracted from the broadcast signal; Vertical and horizontal synchronization detectors for detecting vertical and horizontal synchronization signals from the image signal; A microcomputer for extracting OSD information corresponding to a user's request from the storage unit and generating an OSD driving control signal, a data distribution control signal, and a buffer selection signal corresponding to the extracted OSD information and the vertical and horizontal synchronization signals; A plurality of buffer memories for temporarily storing OSD information provided from the microcomputer; A data distributor selectively providing OSD information provided from the microcomputer to the plurality of buffer memories based on the data distribution control signal; A buffer selector for selectively outputting OSD information applied from the plurality of buffer memories based on the buffer select signal; An OSD driver configured to process the OSD information applied from the buffer selector based on the OSD drive signal and configure an OSD screen superimposed on the video signal; Provided is an OSD processing apparatus of an imaging device including a display unit for displaying the OSD screen.

1 is a block diagram illustrating an OSD processing apparatus of a general video device;

2 is a block diagram illustrating an OSD processing apparatus of an imaging apparatus according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: low noise converter 102: satellite signal receiver

104: local oscillator 106: frequency mixer

110: first low noise converter 112: first satellite signal receiver

114: first local oscillator 116: first frequency mixer

120: second low noise converter 122: second satellite signal receiver

124: first local oscillator 126: first frequency mixer

130: frequency synthesizer 200: satellite broadcasting receiver

210: system control unit 220: tuner and demodulation unit

230: MPEG decoder 240: video and audio signal processing unit

Hereinafter, with reference to the accompanying Figure 2 will be described in detail a preferred embodiment of the present invention.

2 is a block diagram illustrating an OSD processing apparatus of a video device according to the present invention. At this time, in order to help the understanding of the present invention, the same reference numerals are given to the same members having the same configuration and function as those of the conventional OSD processing apparatus shown in FIG. In addition, the signal transmission path is shown by the solid line, and the data transmission path is shown by the dotted line.

Referring to FIG. 2, an OSD processing apparatus of an imaging apparatus according to the present invention uses a data distributor 600, a plurality of buffer memories 710, 720, and 730 and a buffer selector 800 as compared to a conventional OSD processing apparatus. Further, the microcomputer 200 further performs a function of generating a data distribution control signal and a buffer selection signal as compared with the conventional art.

Hereinafter, the function and configuration of each component member added according to the present invention will be described, and the component members that perform substantially the same functions as the prior art, that is, the vertical and horizontal synchronization detectors 100, the storage unit 300, Operation descriptions of the OSD driver 400 and the display unit 500 have been described above and thus will be omitted.

First, the data distributor 600 selectively provides OSD data provided from the microcomputer 200 to the plurality of buffer memories 710, 720, and 730 based on the data distribution control signal provided from the microcomputer 200.

The plurality of buffer memories 710, 720, and 730 are buffer memories having a predetermined storage capacity. The plurality of buffer memories 710, 720, and 730 temporarily store OSD information provided from the data distributor 600 and then provide the stored OSD information to the buffer selector 800. do. In this case, the plurality of buffer memories 710, 720, and 730 are used to alleviate the data transfer speed provided from the microcomputer 200 to the OSD driver 400, and the number of buffer memories corresponds to the data processing of the OSD driver 400. It will be set corresponding to the speed and the data transfer speed in the microcomputer 200. In this embodiment, the case of using three buffer memories is taken as an example.

The buffer selector 800 is based on the buffer select signal provided by the microcomputer 200, and selects one of the buffer memories corresponding to the buffer select signal among the plurality of buffer memories 710, 720, and 730 (ie, 710, 720, and 730). OSD information provided from one) is provided to the OSD driver 400.

The microcomputer 200 generates a data distribution control signal for causing the data distributor 600 to select a buffer memory to provide the OSD information, and provides the generated data distribution control signal to the data distributor 600, and selects a buffer. The controller 600 generates a buffer selection signal for selecting a buffer memory for outputting OSD information, and provides the generated buffer selection signal to the buffer selection unit 800. In this case, the data distribution control signal is an output terminal selection signal of the data divider 600 and is generated in consideration of the storage capacity of the buffer memory, and the buffer selection signal is an input terminal selection signal of the buffer selector 800. Will be generated taking into account the data processing speed.

Hereinafter, a process of operating the OSD processing apparatus of the present invention including the above-described member will be described.

First, when a key signal requesting a predetermined OSD screen is applied to the microcomputer 200 by a user's key manipulation, the microcomputer 200 extracts OSD information corresponding to the key signal from the storage unit 300, and the extracted microcomputer 200 displays the OSD information. A data distribution control signal is generated along with the OSD information and provided to the data distributor 600. In this case, the data distribution control signal is a signal for selecting an output terminal of the data distributor 600, and the data distributor 600 first displays the OSD information provided from the microcomputer 200 based on the data distribution control signal. 710). In addition, the data distribution control signal is generated in consideration of the storage capacities of the buffer memories 710, 720, and 730, and the OSD information corresponding to the storage capacities in the first buffer memory 710 is stored in the first buffer memory 710. At the time point provided, the data distribution control signal will select the second buffer memory 720, and by repeating such a process, the OSD information provided from the microcomputer 200 will be divided into the data distributor 600 based on the data distribution control signal. The first buffer memory 710, the second buffer memory 720, and the third buffer memory 730 are provided through the operation of.

Meanwhile, the buffer selector 800 selects an input terminal connected to the first buffer memory 710 from among the plurality of input terminals based on the buffer selection signal from the microcomputer 200, and inputs the first buffer memory 710 to the first buffer memory 710. OSD information provided from the first buffer memory 710 is provided to the OSD driver 400 through the connected input terminal.

On the other hand, the microcomputer 200 provides the OSD information and the data distribution signal to the data distributor 600 and simultaneously displays the OSD based on the horizontal and vertical synchronization signals of the image signals provided from the vertical and horizontal synchronization detectors 100. The driving control signal is generated and the generated OSD driving control signal is provided to the OSD driver 400, and the OSD driver 400 supplies OSD information provided from the buffer selector 800 based on the OSD driving control signal. It consists of an OSD screen superimposed on a video signal.

As described above, while the OSD driver configures the OSD information stored in the first buffer memory 710 as the OSD screen, the OSD information provided from the microcomputer 200 via the data distributor 600 is stored in the second buffer memory. 720 and the third buffer memory 730 will be sequentially stored. At this time, when the data transfer speed from the microcomputer 200 is faster than the speed at which the OSD driver 800 processes the OSD information, the data storage in the second buffer memory 720 and the third buffer memory 730 is completed. It would be desirable to add buffer memory. In the meantime, when the OSD information provided by the microcomputer 200 may be stored in the second buffer memory 720 only while the OSD driver 800 processes the OSD information, the data transmission speed of the microcomputer 200 may be slow. It might be possible to reduce the buffer memory.

According to the present invention described above, when a large amount of OSD information is transmitted from the microcomputer 200 than the OSD driver 800 can process the OSD information, the excessively transmitted OSD information is sequentially stored in a plurality of buffer memories. After being stored, the OSD driver 800 sequentially processes the information, and then sequentially provides the OSD information stored in the buffer memory, thereby preventing the loss of the OSD information due to overflow, thereby providing a more stable OSD screen. It can work.

Claims (1)

In the OSD processing apparatus of the video device configured to process the OSD (on screen display) information included in the broadcast signal or superimposed on the video signal by processing the OSD (on screen display) information, A storage unit for storing the preset OSD information or the OSD information extracted from the broadcast signal; Vertical and horizontal synchronization detectors for detecting vertical and horizontal synchronization signals from the image signal; A microcomputer for extracting OSD information corresponding to a user's request from the storage unit and generating an OSD driving control signal, a data distribution control signal, and a buffer selection signal corresponding to the extracted OSD information and the vertical and horizontal synchronization signals; A plurality of buffer memories for temporarily storing OSD information provided from the microcomputer; A data distributor selectively providing OSD information provided from the microcomputer to the plurality of buffer memories based on the data distribution control signal; A buffer selector for selectively outputting OSD information applied from the plurality of buffer memories based on the buffer select signal; An OSD driver configured to process the OSD information applied from the buffer selector based on the OSD drive signal and configure an OSD screen superimposed on the video signal; And a display unit for displaying the OSD screen.