The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 1989
Filed:
Dec. 10, 1986
Takatoshi Ishii, Tokyo, JP;
ASCII Corporation, Tokyo, JP;
Abstract
An image display apparatus reads color data and attribute data accompanied with the color data from a RAM of a look-up table (LUT) in accordance with each color code read from a video memory (VRAM). The read color data is subjected to a data modification determined by the read attribute data, and a color of each display dot is determined in accordance with the color data obtained as the result of the data modification. According to this image display apparatus, an image and the color thereof can be displayed without storing all the color codes of the image into the VRAM, so that the load on the CPU can be reduced and the image can be displayed at a high speed. The LUT can be omitted by storing, correspondingly to each display dot, display data composed of color data and attribute data in the VRAM. The circuit for effecting the data modification may comprise a plurality of registers and an operation circuit for effecting an operation on data contained in the registers. In this case, the registers and the operation circuit are controlled in accordance with the read attribute data to obtain various display effects such as Gouraud Shading and Phong Shading.