JPS6289086A - Color image display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (a) Field of Application This invention relates to a color image display device that uses a computer to display figures in color. (b) Prior art corresponding to each pixel of a display screen. A frame memory type color image display device may be constructed as shown in FIG. 2 in the past. That is, in FIG. 2, reference numeral 1 denotes a frame memory, which corresponds to each pixel on the display screen and has a storage capacity of n bits (n is a positive integer) for each pixel. This frame memory 1 stores the value of each pixel sent from a control converter (not shown), that is, n-bit pixel data. This frame memo l) 1
The 0 content is read out in rask order when displaying an image, and the read n-bit pixel data is given to a look-up table (LUT) 2 as an address. The lookup table 2 has a storage capacity of 2rL x m x 3 (m is a positive integer) bits, and has a 2n x m bit configuration corresponding to the three primary colors R (red).
and a lookup table 2b with a 2rLxm bit configuration corresponding to G (green) and 2rLxm corresponding to B (blue).
It consists of a look amplifier table 2C with a bit configuration. This lookup table 2 is a rewritable memory and stores color data of 23rrL colors. Then, by addressing the n-bit pixel data,
M-focus color data is outputted from each look-up table 2a, 2b, 2c, respectively, to a corresponding D/A (digital/analog) converter 3a.

3b and 3e convert it into an analog image signal and output it for display. With this method, 2n colors can be displayed simultaneously on one screen.

(c) Problems to be solved by this invention In the above-mentioned device, the image display area is divided into multiple windows (rectangular areas).
In some cases, you may want to set the color display for each window individually on the display screen. In this case, each pixel data of the corresponding windows la, lb, le of the frame memo IJ 1 is read out from the color data of each fixed corresponding area in the lookup table 2, so the pixel data in the frame memory and the display color are read out. The correspondence relationship is fixed, and there was an inconvenience that it could not be set individually for each window.

This invention is a color image display device that can independently set the display color of image data for each of multiple windows set on one screen. It is to provide.

(D) Means for Solving the Problems This invention provides a frame memory that stores pixel data of n bits per pixel, and a frame memory that corresponds pixel by pixel to each of a plurality of windows partitioned into the frame memory. A window management memory having a storage capacity of bits per pixel in which window data of different values are stored for each pixel, and a RAM having a storage capacity of at least m bits/word and 2+i words, A look-up table is provided corresponding to each of the three primary colors in which m-bit color data is stored for each window.

When displaying an image, the contents of the frame memory and the window management memory are simultaneously read out pixel by pixel, the read (k+T'L) bit data χ is provided as an address of the lookup table, and further specified by this address. Outputs color data of three primary colors of each m bit of the corresponding window from the lookup table that has been created. Window data shown in 7 is stored.

Therefore, by giving this window data and 7 pixel data as an address to the lookup memory, the lookup memory address? Can be changed for each window.

(f) Example Is Figure 1 an example of this invention? Reference numeral 11 in the figure is a frame memory, which stores pixels corresponding to one screen together with pixel data of n bits per pixel. This frame memory 11 stores a plurality of arbitrary windows (for example, windows lla, l1l).

11c is divided into sections corresponding to the display screen. On the other hand, in FIG. 1, reference numeral 12 denotes a window management memory, which is provided with a storage area for each pixel corresponding to the storage area for each pixel of the frame memory 11, and has a storage capacity of bits per pixel. are doing. This window management memory 12 stores each pixel belonging to the same window divided in the frame memory 11 and each corresponding pixel? Window data indicating that each window belongs to the same window is stored in the indicated areas. For example, frame memory 11
The windows 12 on the window management memory 12 corresponding to the windows lla, llb, llc, respectively.
a, 12b, and 12c each have a window 12a.

The same window data is stored pixel by pixel in each of 12b and 12c. The n-bit pixel data read from the frame memory 11 and the k (k is a positive integer) bit window data read from the window management memory 12 are given as address data of the look-up table 13.0 Look amplifier Table 13 has 3 primary colors R2G, B
Three lookup tables 13a and 1 corresponding to
3b and 13c. Each of the lookup tables 13a, 13b, 13c is constituted by a RAM having a storage capacity of 7 for 2+1 words and m (m is a positive integer) bits/word.

Each lookup table can be divided into two windows determined by the value of the window data in bits, and each window can independently access pixel data from the frame memory from a control converter (not shown). Corresponding m-bit color data should be written in advance. That is, the display color of image data can be set independently for each window up to 2.0 The types of colors written in the lookup table 2 are 23.
Since there are m colors and the colors can be rewritten independently for each window, 2 color data can be stored independently for each window.

Lookup tables 13a, 13b, 13c
The m-bit color data outputted from the input terminals are given to the corresponding D/A converters 14a, 14b, and 14c, respectively.

Each D/A converter converts digital color data into an analog image signal and outputs it for display in each color R, C, .

When displaying an image, the contents of the frame memory 11 and the window management memory 12 are simultaneously read out in rask order using a synchronized clock signal, and the read (n + k) bits of data are stored in each lookup table 12a, 1
2b, 12c Specify Y-near address.

Each lookup table outputs specified m-bit color data for display. You can display up to 21 different colors simultaneously on the same screen in each window.

(G) Effects This invention allows a plurality of windows to be set on one screen, and a display color corresponding to an image can be set independently for each window. Therefore, the use of color image display is expanded. Multi-window display 7 image processing, C
It can be suitably used in AD systems.

[Brief explanation of drawings]

FIG. 1 is a block diagram of main parts showing an embodiment of the present invention, and FIG. 2 is a block diagram of main parts of a conventional color image display device. 11... Frame memory, 11a, 11b, 11C... Window, 12...
Window management memory, 12a, 12b, 12cm window, 13.13a,
13b, 13c... Lookup table. Patent applicant f Shutomo Electric Industry Co., Ltd. Figure 1 Figure 2

Claims (1)

[Scope of Claims] A frame memory that stores pixel data of n bits per pixel, and a frame memory that corresponds pixel by pixel to each of a plurality of windows partitioned in the frame memory, and has window data having a different value for each window. A window management memory having a storage capacity of k bits per pixel to be stored, and a RAM having a storage capacity of at least m bits/word, 2^k^+^n words, corresponding to the pixel data. and a lookup table provided corresponding to each of the three primary colors, in which m-bit color data is stored for each of the windows, and the contents of the frame memory and the window management memory are simultaneously read pixel by pixel. read, this read (k+
n) bits of data is given as an address of the lookup table, and further m bits of color data of each corresponding window is output from the lookup table specified by this address. Display device.