CN1008838B - Be used for producing the calculator display organization of color text and graphics - Google Patents

Abstract

The method and apparatus that provides color character and graphics to show is provided.The present invention includes the bit mapped memory of the drawing pattern information of three storage different colours, but has only a character generator, also comprise other device, the combination that it can be by different colours to be obtaining multiple predetermined color, and with wherein any color videotex or graphics.

Description

Be used for producing the calculator display organization of color text and graphics

In general, the present invention relates to about calculator display organization.Especially relate to and text and the graphics relevant color display system that combines.

In many commercial occasions of using, to show graphics and alphanumeric text usually.If this demonstration that just requires character and graphics both simultaneously be independently again.In order to give prominence to the different graphics that appear at a width of cloth screen displayed with difference, need represent each figure and text with different colours.Prior art utilizes 3 bit mapped memories that the form of text with the red, green and blue look is stored in the different bit mapped memories, equally also shows with 3 bit mapped memory storage graphics.Correspondingly, need 3 character generators to generate the text of different colours under the normal condition.Just there is the unfavorable factor that needs too much hardware and therefore increase the calculator display organization expense in this.

The basic purpose of the present invention provides improved display system.

Another purpose of the present invention provides the improved display system that possesses colored ability.

Another purpose of the present invention provides the improved display system that shows graphics and text with different colours.

This display system comprises 3 bit mapped memories representing the pixel (position) of drawing displayed image in order to storage.Each of these 3 bit mapped memories all is used for showing graphics with a kind of specific color.Other color can be utilized the content of each bit mapped memory, by showing in conjunction with the color in each bit mapped memory.

Text message is stored in the data random access memory (RAM) with the byte form.In addition, characteristic character is stored among the feature RAM.

Mix that ROM (read-only memory) (ROM) receives from some mapped storages among 3 bit mapped memories and the pixel that comes by one, this pixel is represented with signal form.Equally also receive text signal from the data RAM that is coupled to character generator.This character generator storage is used for producing the character signal of the text byte that is stored in above-mentioned data RAM.

Mix ROM and also utilize characteristic signal to provide low-light level demonstration or high brightness to show, or be used for converting text background or graphics color.

The purposes of mixing PROM is to receive colored graphics signal, monochromatic text signal and mode control signal so that produce the representative pixel that is used to show in the demonstration of color CRT, and this CRT can independently can mix ground display color graphics and color text.

As the distinctive novelty of the present invention, in additional claims, will mention especially.Yet this invention itself all can be by understanding with reference to following description and following accompanying drawing well aspect two of structure and operations.

Fig. 1 is a block diagram of the present invention.

Fig. 2 A and 2B are logic diagrams of the present invention.

Fig. 3 is the mode chart of color mix ROM.

With reference now to Fig. 1,, this is a block diagram of the present invention.Bit mapped memory 101,102, the graphics map that 103 storages will show on display screen.Be stored in map in the bit mapped memory 101 with red display, the map that is stored in the bit mapped memory 102 shows that with green the map that is stored in the bit mapped memory 103 shows with blueness.Each bit mapped memory all is a random access memory, and it includes the screen map of 216,000 pixels (720 * 300 pixel).Each storage unit in each bit mapped memory represents that all one will be decided the pixel that color shows to give on monitor.The monochromatic selection needs single flat memory, is one of each display element just.Colored need to select three flat memories, 101,102,103, one planes are used for three kinds of basic colors-red, a certain in the green and basket.When writing colored selection memory, be written in one or several plane at addressable pixel location place, to obtain the color of appointment.When all corresponding pixel in three planes are zero, just show black.A microprocessor (not shown) control writes the content of actual bit mapped storage.When write command, just data are write a pixel.From PCO interface IP address 23 or select the address signal of (RAS/CAS) 6 to carry out addressing from row address selection/column address by 4 pairs of bit mapped memories of address multiplexor selector switch 101,102,103.Each bit mapped memory is made up of the dynamic ram of 8 64K * 1, and their storages are used for not drawing at CRT() last 216,000 pixels that show.The position of some typical graphics of figure ROM16 storage representation, these figures can be shown, that is: diagonal line, cross hatch, zone of getting ready or the like.Pattern control register 18 storage shows the mode signal of replacement operation pattern, the alternative patterns of operation have " or " pattern and distance pattern.Give set output signal according to the state of mode signal that comes self mode control register 18 and selected from figure ROM16.From bit mapped memory 101,102, to read 8 bit data in 103, and this 8 bit data is delivered to the position select 34, digit selector 34 is delivered to bit map register 36 to the position of selecting from each described bit mapped memory.When obtaining allowing signal, transceiver 38 allows to reflex on the data bus 21 from the data bit of bit map register 36.Three low level instruction address bits in the read command are delivered to the pixel of color selector switch to determine to occur in the data byte that returns.Under the situation of memory write operation, the whole byte of the data that send from PCO23 is used to determine the content of the address pixel location that writes bit mapped memory.The write order data byte is used for figure selecting (3 high-order command bits of octet word) with position 0,1 and 2, and position 3 and 4 is used to preserve the operation of waiting until its usefulness, position 5,6 and 7 is used for color selects.Under the colored display mode of figure selecting, position 5 writes red plane, and position 6 writes green color plane, and position 7 writes blue color planes.Therefore, utilize these three positions just can produce 8 kinds of colors.

Bit mapped memory 101,102,103 output signal at first is cushioned device 104,105, and 106 bufferings are cushioned device 107,108 then again, 109 bufferings; Last these output signals are in bit shift register 110,111, become serial signal in 112, and this serial signal are sent to text mixing PROM123.

The text that data RAM 115 storages will show on CRT.The storage of data and to read be to carry out under the control of CRTC116.Secondly, read from data RAM 125, the text of representing with signal form is sent to character generator 119.Then, the output signal of character generator 119 is sent to text mixing PROM123.

With reference now to Fig. 2 A and 2B,, with the monochromatic display packing generation text of standard.The text display code is in data RAM 115, and corresponding feature (that is: flicker, anti-phase demonstration, blank or the like) is stored among the feature RAM114.Feature RAM114 and data RAM 115 are stored octet separately.Cathode ray tube controller 116 is by controlling the addressing to data RAM115 to the mode of data RAM 115 sending order addresses.The output of data RAM 115 is stored in the data register 118, and the output of feature RAM114 is stored in the feature register 117.The output of data register 118 is sent to character generator 119, and this output is to deliver to character generator 119 with the form of data byte.4 grating signals from cathode ray tube controller 116 also are sent to character generator 119 to realize the addressing to each character horizontal line.The output of character generator 119 is sent to shift register 121.Register 121 be will be used for the text signal that shows of CRT change the serial shift register of serial signal into.It has same function with the shift register 110,111 and 112 that is used for colored demonstration.

Signal VIDEOI-lR from shift register 121 is sent to driver 131, and driver 131 is converted to VIDEOD+00 with this vision signal and then it is stored in the register 113.3 characteristic signal INVRSE+lR from feature register 120 are arranged, LOWINT+lR and CuRSOR+lR; These signals are sent to and produce signal INVRSE+00, the driver 122 of LOWINT+00 and CuRSOR+00.

In the standard operation that this computer system graphics is selected, the drawing pattern information that shows on screen will be stored in bit mapped memory 101,102 and 103.The point of all redness is stored in the bit mapped memory 101, and the point of all greens is stored in the bit mapped memory 102, and the point of all bluenesss is stored in the bit mapped memory 103.By a redness, green and blueness combines, and just can produce several different colors outside basic color.Bit mapped memory 101,102 and 8 outputs of 103 are stored in their impact dampers separately-and to be used for red impact damper be A104, and being used for green impact damper and being A105 and being used for blue impact damper is A106.These bytes are sent to successively and are used for red impact damper B107, are used for green impact damper B108 and are used among the blue impact damper B109.These data bytes are sent to and are used for red shift register 110 then, are used for green shift register 111 and are used for blue shift register 112; These shift registers produce colour signal VIDRED+00 separately, VIDGRN+00 and VIDBLu+00, and these signals deposit register 113 in the rise time of Dot Clock signal DOTCLK+lD then.From the color output signal VIDRED+lD of register 113, VIDGRN+lD and VIDBLu+lD are sent to the address entry terminal of ROM (read-only memory) 123 then.In addition, inversion signal INVRSE+00, low brightness signal LOWINT+00 and video signal VIDEO D+lF also are sent to the Input Address terminal of ROM123.What be sent to ROM123 Input Address terminal also has: text display signal TEXTON+00, differentiate (Palate) signal PALATE+00 and drawing signal GRAFIC+lD, graphics signal GRCFIC+lD is from mode register 18, and this mode register 18 is under the control of microprocessor 124, send number by primary memory 125 to it by means of data bus 21.When text display signal TEXTON was high level, the text that allows to receive showed on color CRT 130.Distinguishing signal PALATE+00 selects a kind of this text that shows in two kinds of colors, and graphics signal GRAFIC+lD activates the graphics that is used for demonstration on color CRT 130.Then, the output signal REDVID+00 of ROM123, GRNVID+00 and BLuVID+00 stored in the register 126 in the rise time of Dot Clock signal DOTCLK+lD.And then when show allowing the DSPEND+00 signal to be high level, from the output signal REDOuT+00 of register 126, GRNOuT+00 and BLuOuT+00 by they separately AND gate 127,128,129 and by gating.Correspondingly, from AND circuit 127,128,129 color output signal (being signal REDOuT+lG, GRNOuT+lG and BLuOuT+lG) then shows on the screen of color CRT 130.Demonstration permission signal its duration of DSPEN8+00(by the CRTC116 generation is the level demonstration time that light beam passes through the CRT130 surface) also be stored in the register 126 to produce demonstration permission signal DSPEND+00.

ROM123 also produces feature video signal ATTVID+00.ATTVID+00 represents the High brightness characteristics from the text of ROM123.

Now come the ROM123 in 2B with the aid of pictures and 3 again, when some address signal that is sent to ROM123 when being legal, the result that colored graphics and monochromatic text are mixed has mutually produced color text, and it can mix with the demonstration of drawing, and also can not mix with the demonstration of drawing.The TEXTON signal is selected the textual portions of ROM123; And the GRAFIC signal is selected the graphics part.Therefore as shown in Figure 3, when the TEXTON signal be " 0 " and GR AF IC S signal when being " 0 ", there is not the demonstration of graphics or text.When TEXTON is " 1 " and GRAFICS during for " 0 ", can show redness or green text.This selection is made by the PALATE signal.When PALATE for " 0 " and TEXTON for " 1 " while GRAFICS equals " 0 ", just show green text.In a similar fashion preceding two signals are done identical setting and PALATE when equaling " 1 ", will show red text.

And then, text can be mixed mutually with graphics, and text and graphics can be used selected color showing.For example, if the TEXTON signal is that " 1 " and GRAFICS signal are " 1 ", just can select to show green or red text and graphics for " 0 " or for " 1 " according to PALATE.When PALATE was " 0 ", text was used green the demonstration, when PALATE is " 1 ", and the text red display, the demonstration of graphics and PALATE have nothing to do and it can represent color by following truth table.

By the various combination of VIDRED, VIDGRN, VIDBLu and other signal, can concoct color.Therefore, graphics can be with 8 kinds of color showings, and text can be with 4 kinds of color showings.The color of each text can be with high-luminance colour or low-light level color showing.

The explanation of following truth table: be sent in response in the various signals of ROM123, how select to be used for 8 kinds of colors that graphics shows, wherein " 1 " expression signal be vacation for true " 0 " expression signal.

VIDRED VIDGRN VIDBLu is color as a result

000 is black

001 indigo plants

010 is green

011 green grass or young crops

100 is red

101 fuchsins

110 Huangs

111 is white

Claims (2)

1, on the cathode ray tube screen of a calculator display organization, carry out the painted circuit of selectivity of figure and character, it is characterized in that:

A. first address memory (101,102,103), it is handled in its each unit and the corresponding first group of bit of a pixel that will show on cathode ray tube screen, this first group of bit represented the particular color of the corresponding pixel that will be shown, on behalf of first group of signal of the first group of bit that stores in one of them addressed location, first memory (101,102,103) will send out;

B. character generator, its produces second group of signal represent the bit figure, the character that will show with formation;

C. second address memory (123), it is handled in each unit and the corresponding second group of bit of a pixel that will show on cathode ray tube screen, this second group of bit represented the color of the pixel that will be shown, and on behalf of the 3rd group of signal of the color of the pixel that will show, second memory (123) will send out at once;

D. coupled circuit (110,112,121,131), it is coupled to the address input end of second memory (123) to first group of signal and second group of signal.

2, the circuit of claim 1 is characterised in that a signal source (18), the graphical display manipulation on its starter cathode ray tube screen, and second memory receives this signal at its another address input end.

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