Browse Prior Art Database

Dissolving Resolving Display Means

IP.com Disclosure Number: IPCOM000089301D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 3 page(s) / 41K

Publishing Venue

IBM

Related People

Havender, JW: AUTHOR

Abstract

Dissolve-resolve displays can be used to catch attention in show windows, conferences and exhibits, etc. When the display of a message dissolves at high speed, a scintillation effect is exhibited which is very eye catching. This article provides an implementation of such displays.

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Dissolving Resolving Display Means

Dissolve-resolve displays can be used to catch attention in show windows, conferences and exhibits, etc. When the display of a message dissolves at high speed, a scintillation effect is exhibited which is very eye catching. This article provides an implementation of such displays.

The display mechanism itself can be implemented in various ways without affecting the substance of the dissolve-resolve mechanism. For example, Fig. 1 shows a CRT, an adapter, and a buffer memory which contains an image of such display. There is one-to-one mapping between positions on the face of the display and positions in the buffer. The function of the adapter is to scan the buffer memory in synchronism with the raster scan of the display so that the result is that an "image" of the buffer is continuously displayed on the screen of the CRT.

The buffer memory can also be accessed randomly by the dissolve-resolve mechanism in order to read from or store into the buffer memory.

The dissolve-resolve mechanism to be described can be implemented in "random" logic, but we will consider here an implementation employing a microcomputer for control and execution of the procedure to be described.

The program first loads the image to be dissolved into the buffer. Then two positions in the buffer are randomly chosen, and their contents are interchanged. Then, another two points are chosen, etc. The process is repeated some number of times, chosen so that it runs one-half the time chosen for one cycle of the dissolve-resolve display.

Fig. 2 shows a random number generator comprising a shift register. This method of generating "random" numbers is well known in the field of logic design, and the example shown in Fig. 2, having 16 stages, with positions 16, 14, 13 and 11 being exclusive ORed ( ) to position 1, is one of many conf...