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Video display control system
| Details |
Inventors: Nishi, Kazuhiko; Ishii, Takatoshi; Yamashita, Ryozo; Yamaoka, Shigemitsu; Okumura, Takatoshi;
Assignee: ASCII Corp. (Tokyo, JP); Nippon Gakki Seizo Kabushiki Kaisha (Hamamatsu, JP)
Primary Examiner: Curtis; Marshall M.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
A video display control system displays a video image composed of a plurality of display elements on a screen of a video display unit. The system comprises a memory (VRAM) for storing a plurality of color codes each representing at least one display element and a video display controller (VDP). The VDP comprises a mode register for selecting one of normal display and transparency processing modes, display processing circuit for reading the color codes from the VRAM, a backdrop color register for storing a color code such as one representing a backdrop color, a detection circuit for detecting a predetermined color code from the color codes read by the display processing circuit, and a selector controlled by an output of the detection circuit. In the normal display mode, the selector outputs all color codes read by the display processing circuit to the display unit. In the transparency processing mode, the selector outputs the color codes read by the display processing circuit to the display unit when the predetermined color code is not detected, and outputs the color code contained in the backdrop color register to the display unit when the predetermined color code is detected. The VDP further comprises another detection circuit for detecting a second predetermined color code from the color codes outputted from the selector to output a control signal. And if the second predetermined color code is detected in the transparency processing mode, the display unit displays an image in accordance with an external video signal. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a video display control system in which one of color codes can be used either as a color code representative of transparency or as a color code representative of a specific color.
According to one aspect of the present invention, there is provided a video display control system adapted to be connected to a video display unit for displaying a video image composed of a plurality of display elements on a screen of the video display unit comprising: (a) memory means for storing a plurality of color codes each representing at least one of the display elements; and (b) display control means having (i) designating means for designating one of first to Nth display modes (N.
gtoreq.
2); (ii) reading means for reading each of the color codes from the memory means; (iii) first determination means for determining whether each color code read from the memory means coincides with a first predetermined color code to output a first coincidence signal; and (iv) conversion means for converting the color code read from the memory means into a certain color code in response to the first coincidence signal when the designating means designates the first display mode, the certain color code being supplied to the video display unit.
The display control means may further comprise code register means for storing the certain color code.
Also, the display control means may further comprise second determination means for determining whether the color code outputted from the selector means coincides with a second predetermined color code to output a second coincidence signal, and means for feeding an external video signal to the video display unit in response to the second coincidence signal when the designating means designates the first display mode.
According to another aspect of the present invention, there is provided a video display control system adapted to be connected to a video display unit for displaying a video image composed of a plurality of display elements on a screen of the video display unit comprising: (a) memory means for storing a plurality of color codes each representing at least one of the display elements; and (b) display control means having (i) designating means for designating one of first to Nth display modes (N
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