Image display apparatus

Details Image display apparatus Image display apparatus

1986-12-10

1989-08-15

Moore, David K.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340703, 340721, 340728, G09G 128

Patent

active

048578991

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.

REFERENCES:
patent: 4278973 (1981-07-01), Hughes et al.
patent: 4649380 (1987-03-01), Penna
patent: 4651146 (1987-03-01), Lucash et al.
patent: 4673929 (1987-06-01), Nelson et al.
patent: 4677427 (1987-06-01), Komaksu et al.
patent: 4695835 (1987-09-01), Bugg
patent: 4724431 (1988-02-01), Holtey et al.

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