Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Reexamination Certificate
1996-04-26
2001-04-10
Lao, Lun-Yi (Department: 2778)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
C345S182000, C345S182000, C345S182000, C348S552000, C348S558000, C348S569000
Reexamination Certificate
active
06215467
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a display control apparatus and method for a display, and a display apparatus comprising the display control apparatus and, more particularly, to a display control apparatus and method suitable for display control of a display apparatus having a dot matrix display.
A display control apparatus, which receives television input signals of the NTSC, PAL, SECAM systems, and the like, and computer input signals from a personal computer, a workstation, and the like, and displays the input signal on a display apparatus, is known.
In recent years, a so-called OSD (on-screen display) technique that makes a display for facilitating various kinds of adjustment processing is known. An operator can easily perform various kinds of adjustment processing (e.g., brightness, contrast, and the like of the display screen) of the display apparatus by operating various operation keys of the display apparatus while observing the OSD.
On the other hand, a so-called P&P (Plug and Play) display interface, which directly receives an analog input signal (CRT signal) input from various kinds of host computers to a CRT display apparatus, and converts it into a signal that can be displayed on a stand-alone type liquid crystal display apparatus, is known. The P&P interface is a very effective interface upon replacement of the CRT display apparatus with the stand-alone type liquid crystal display apparatus.
In the above-mentioned P&P interface, a demand has arisen for realization of a multisync P&P interface, which can cope with various input signals from, e.g., a personal computer, workstation, TV, VTR, and the like, and can also cope with a change in display mode (display resolution) of a personal computer. However, upon realization of such multisync P&P interface, since an input signal from a host computer has a resolution and dot clocks different from those of an input signal from a TV, VTR, or the like, these input signals and the OSD data cannot be simply selectively output.
When the OSD data is superimposed on image data, it is strongly demanded to always display the OSD data on the screen to have the same size independently of the resolution.
SUMMARY OF THE INVENTION
The present invention has been made in consideration of the above-mentioned problems, and has as its object to provide a display control method and apparatus, and a display apparatus, which can appropriately display OSD data in correspondence with display states with different image resolutions and dot clocks.
In order to achieve the above object, a display control apparatus according to an embodiment of the present invention comprises the following arrangement. That is, there is provided a display control apparatus having a plurality of different display modes for displaying a plurality of types of image signals corresponding to different resolutions and dot clocks, comprising: discrimination means for displaying a display mode of a currently displayed image signal; selection means for selecting OSD data to be displayed on the basis of the display mode discriminated by the discrimination means; input means for inputting the OSD data selected by the selection means in place of the currently displayed image data; and output means for outputting the OSD data input by the input means in the display mode of the image signal.
Preferably, the OSD data has font sizes and shapes corresponding to respective display modes, and the selection means selects the OSD data so as to obtain an appropriate character size and shape in each display mode. In this manner, driving condition differences in various display modes can be absorbed, and the OSD data can be stably displayed.
Preferably, the font size and shape are determined on the basis of a dot clock speed in each display mode and an input speed of the OSD data by the input means. In this manner, even when the image of the OSD data is enlarged or reduced in size in correspondence with dot clock differences of the display modes, OSD data having a font size and shape corresponding to the enlarged or reduced size is used to maintain a desired size and shape.
Preferably, the OSD data has display contents corresponding to respective display modes, and the selection means selects the OSD data having appropriate display contents in each display mode. In this manner, appropriate operations can be attained in the respective display modes.
Preferably, the plurality of display modes include a first display mode for displaying at least a composite video signal, and a second display mode for displaying a computer CRT signal. In this manner, the display control apparatus having typical display modes with different driving formats and a broad application range can be provided.
When the OSD data is displayed in the first display mode, the output means preferably performs, for the input OSD data, the same processing as processing that is performed for an RGB signal obtained by converting the composite video signal, and outputs the processed OSD data.
With the above-mentioned arrangement, in the display control apparatus having a plurality of different display modes for displaying a plurality of types of image signals corresponding to different resolutions and dot clocks, OSD display operations matching the respective display modes can be attained. Such operations are attained as follows. The discrimination means discriminates the display mode of the currently displayed image signal, and the selection means selects OSD data to be displayed on the basis of the display mode discriminated by the discrimination means. When the input means inputs the selected OSD data in place of the currently displayed image data, the output means outputs the input OSD data in the display mode of the image signal displayed immediately therebefore.
For this reason, OSD data matching an input signal from a host computer or an input signal from a TV, VTR, or the like can be appropriately output, and a multisync P&P interface can be realized.
It is another object of the present invention to provide a display control apparatus which can display OSD data with a predetermined size independently of the display resolution of an input signal.
In order to achieve the above object, in another embodiment of the present invention, there is provided a display control apparatus comprising: enlargement means for enlarging the number of horizontal pixels of image data up to the number of pixels that can be displayed by a display; interpolation means for interpolating the number of vertical lines of the image data processed by the enlargement means to obtain the number of pixels that can be displayed by the display; and display processing means for performing processing for adding predetermined display data to the image data processed by the interpolation means, and supplying sum data to the display.
According to the present invention, data can be displayed on a dot matrix display in the maximum possible enlarged scale in correspondence with various resolutions, and OSD data can always be displayed to have a predetermined size.
Other objects and features of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.
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Inoue Kenji
Nakajima Tatsuya
Sawada Masayuki
Shibamiya Yoshikazu
Suga Kazumi
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Lao Lun-Yi
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