JPS63502054A - Method and apparatus for producing multicolor display - 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] Background of the Invention: Method and Apparatus for Producing Multicolor Displays field of invention TECHNICAL FIELD This invention relates generally to multicolor display systems, and more particularly to rask scan digital display systems. Increase the number of shades of color that can be displayed simultaneously on a color display Apparatus and method. An improved method of simultaneous displayable color generation described herein is most directly applicable to computer-generated color graphics. However, the concept can also be applied to other video display devices.

This application is filed June 20, 1984, pending U.S. Application No. 622,570. and a continuation in part of PCT Application No. PCT/US85101160.

Description of prior art The field of the invention is color generation for computer-controlled color graphics systems. The discussion of the prior art covers analog and digital improvements. Must include both digital color video circuitry and display equipment. stomach. Computer-controlled color raster graphics systems are analog graphics It can be classified into graphic system and digital graphics system. analog color google In a graphics system, rask information stored in video memory is transferred to an analog camera. Digital to analog converter (DAC) is used to drive the color monitor. Converts digital voltage to analog voltage. digital color graphics system In the system, the rask information stored in the video memory is digitally displayed in digital color. sent to the monitor.

Analog systems are used to generate different shades of color on the monitor screen. Using different voltage levels in an analog monitor color electron gun. analog The analog input voltage to the monitor is typically between 0 and 7/10 volts. each electric By changing the input voltage between 0 and 0.7 volts, different colors can be created. Shade is obtained on analog monitor. Therefore, in theory, an infinite number of colors can be analog You can get it on your monitor. There are two types of digital color graphics systems. Only voltages at levels , i.e. low and high levels, are recognized. Therefore, de If a digital color monitor has m color manpower, then 2'1 color manpower. Combinations are possible.

Analog color graphics systems can generate a large number of colors, but There are problems associated with drift, drift and long rise and fall times. this Problems manifest themselves in the form of color mismatches and bleeding on the screen. . Bleeding is the difference between two adjacent pixels with different colors on the screen. or create undesirable colors between dots. Bleeding is a color voltage signal. This is caused by the long rise and fall times of the signal. 1 of the images on the screen / As resolution increases for a constant screen update rate of 60 seconds, pixel updates The time for (pixel period) decreases.

A pixel period is a screen shot when a color electron beam sweeps across a monitor screen. There is a time required to traverse one pixel (or dot) on the lean. that Therefore, at high image resolution, the electron beam sweeps each pixel on the monitor. Time decreases. On analog monitors, the amount of bleeding increases with image resolution. This causes the edges of the image to blur with undesirable color.

Voltage drift with increasing temperature changes the color on the analog monitor.

Another problem associated with analog color generation is noise.

As the number of color shades per electron gun increases, the voltage level between the next color shade increases. Bell decreases. Therefore, the noise margin should decrease as the number of desired colors increases. Must be. Most of these problems with analog color monitors are minimized. To do this, analog video amplifiers must be rigorously designed with high bandwidth. However, this will be expensive.

On the other hand, digital color graphics systems suffer from color bleeding and voltage There is no problem with the lift issue. Digital color monitors have two logical levels It has a digital bio-amplifier that detects only the signal. Therefore they are easy to design Yes, it is cheap. Digital switching circuits use signals with short rise and fall times. This greatly reduces bleeding.

As a result, a clearer image can be obtained. In addition, you can also send data from the board to the monitor. Lines that transmit digital video signals are prone to noise because the two logic levels are widely spaced. low sensitivity to However, digital color graphics systems There is a limit to the generation of color (there is a limit). This is because only colors can be generated.

To get more colors on a digital monitor, change the color on your digital monitor. IBM's EGA system, which can generate 64 colors, increases the number of color-controlled input lines. It looks like a 6-line color monitor on a system. This method monitors from the video circuit. increases the number of lines extending to the monitor, making the video amplifier circuitry within the monitor more complex .

Another method for generating more colors is called dithering.

This method allows each pair of adjacent pixels on the monitor screen to form one dot on the image. It is intended to represent the These vixels are divided into image frames (generally 1/ dithering by alternating their colors every 60 seconds). This image frame The successive alternations of each frame create a unique color due to the color mixing effect. However, this technology requires additional hardware or firmware to perform the alternation. do. Dithering also causes a reduction in image resolution and flickering of the image.

This technology can be used to generate up to 136 colors on a digital monitor. .

There are other methods in conventional color monitors that relate to color generation. US Patent No. 24 In No. 31088, Tzego demonstrated that fluorescence emission is selectively produced at different density levels. Color by beam intensity modulation using screen fluorescent mixtures We are proposing a method of occurrence.

In U.S. Patent No. 3,371,153, W, Matsutsuen changed the CRT screen to each color. coated with fluorescent materials with different detection beam energy activity levels A color display system is disclosed. The high voltage accelerating the cathode ray tube A specific color signal that modulates the intensity of the image is described in U.S. Pat. No. 4,214,277. continuous tones using only black and white levels so that the eye perceives a gray image. describes a ``halftone'' technique to represent halftone images. He uses this as an analog monitor digitally subdividing the data pixels into black and white sub-element matrices. more accomplished.

In U.S. Pat. No. 4,383,256, Kurahashi et al. Halftone images are generated by controlling the excitation period according to the image signal amplitude. .

In U.S. Pat. No. 4,340,889, Knight et al. The change allows complete display dimming.

In U.S. Pat. No. 4,467,322, Bell et al. A method for generating different color shades for the landscape and cursor is disclosed. child This method uses intermediate images for each of the three main color electron guns of a digital color monitor. It is the use of pulse width modulation to generate fades. This is the partial width pal uses "hardwired" technology, including a resistive-capacitive circuit to vary the . Since "hardwired" circuits can only be changed manually, this method can display up to three backgrounds per electron gun simultaneously on a digital color monitor. Can generate cursor color shades. Temperature changes are a timing parameter of the circuit. Change the intermediate color shade by changing the data. This method generally uses red, green, and blue (RGB) It is not possible to generate 27 or more simultaneous colors on a digital color monitor. Can not. This only requires manual control of the intermediate shade of each electron gun on the digital monitor. possible, and the intermediate shades for each gun have the same intensity .・ In U.S. Pat. No. 4,516,118, Wahlquist With 6 power lines, up to 64 colors can be generated on a 3-person digital color monitor. Discloses technology that enables He produces over 27 colors on a digital color monitor. This figure shows some possible conversion circuits. Generally everything disclosed in this patent All circuits and their modified circuits can be connected to a 3-person digital color monitor with up to 64 It is possible to generate up to 3 colors that can be displayed simultaneously.

In U.S. Pat. No. 3,725,578, Brown et al. "Halftone amplifier for digital video receivers by using cycle pulses" Discloses "process". However, this technique is a function of the transmission signal bandwidth. It concerns the change in duty cycle of the Nyquist period. This technique is also simple. Concerns only the generation of halftones in color digital color displays . Monochromatic displays do not have a grid between the electron gun and the screen, so A fixed dot period on the screen is not limiting. This patent is a digital color - It is not concerned with the occurrence of multiple colors on monitors, and is not concerned with the occurrence of multiple colors on monitors, and It only concerns a video receiver as opposed to a spray device.

However, none of the above can display many colors simultaneously on a digital display device. Parallel pulse generator with generation and selection means for parallel partial pulse width signals as shown The width modulation method is not used. In addition, all of the above also limit the color range that can be displayed at the same time. Regarding separate intensity control lines of digital display equipment for further expansion Does not use pulse width modulation.

In expensive analog graphics systems and digital color systems Given the drawback of the limited methods available for generating a large number of colors, Digital color without any reduction in image resolution or screen update speed There is a means to generate multiple colors in the digital color system driven by the monitor. requested.

Summary of the invention The main purpose of the water spray invention is to use independent parallel pulse width modulation of each color electron gun. , a large number of colors (e.g. two 62.144 colors) and/or display them simultaneously. That is.

Another object of the invention is to provide raster scan data by parallel pulse width modulation of the intensity control lines. A novel method for controlling the overall intensity of colors produced in digital color display devices The purpose is to provide a method.

Another object of the invention is to provide an apparatus for carrying out this new method. , which replaces existing digital color tags with replacement cards or bigyback cards. can be easily added to the traffic system, or as a chip or high can be integrated into a hybrid or programmed into a programmable chip. I can do it.

A further object of the invention is to integrate existing modules into newly created systems. Provides equipment for implementing novel methods that can be easily integrated into wall structures It is to be.

In the method of the invention, each pixel on the screen is The time each primary color is excited by the electron gun produces many new color shades be modified individually to Furthermore, if the intensity control line is on the monitor, it is also the same. control to change the overall intensity of the color of the pixels on the screen.

In general, digital color monitors use arbitrary primary colors in one pixel. The intensity is proportional to the energy imparted to that pixel by the sweeping electron beam.

This energy is used in digital systems when the pixel is exposed to an electron beam. This can be varied by controlling the amount of time that the current is excited. one more pic For a given set of excitation times for each primary color in the cell, one pixel The resulting energy of all three beams at The overall change can be made by controlling the on time in the cluster period. I can do it.

As a function of time, the luminance of a single pixel is For the amount of time that a pixel is not excited for the xel period, the pixel is exposed to the electron beam. It is determined by the ratio of the amount of time that is excited. This ratio makes it possible to use parallel pulse width modulation. select multiple colors and display them simultaneously on the screen, if changed by Is possible. Reduces the time a pixel is excited in one pixel period By decreasing the amount, the eye perceives a darker shade of color. The partial pulse width is It occurs with pulse widths that widen one after the other within a given pixel period. You can. If so used, the linearity for each electron gun The color shade control lets 'i' be the result for each color on the screen. Therefore, the following relationship is obtained as the intensity luminance of

i-k (x/l)y (0≧X≧t), where k is a constant number X - Modulated signal pulse width (seconds) t-pixel period (seconds) y - the total intensity luminance of each color on the screen.This technology is used in digital color monitors. are applied independently to each color electron gun (e.g. red, blue, green or RGB). If so, many colors can be generated. Mathematically, n shades are generated per color electron gun. Preferably, a digital color monitor with m color inputs will have 0111 different inputs. color, thus making the theoretical maximum possible color infinite.

Total energy given to color pixels on screen by color electron gun is the sum of the energy given to that pixel by all color electron guns . This energy is expressed in the form of visible light at a lower intensity than that of time. It can be changed by changing the ratio to the time shown. Therefore, n different The intensity line of a digital color monitor with intensity m color lines ( 1 line), it is possible to generate n(+1+1) colors.

Devices based on the above concepts can be added to or integrated into existing controller circuits. That's easy. Generally additional coded color data lines are numbered one of the pulse width modulated pulses must be selected. Parallel pulse width variation The signal is a high signal that is the product of the dot clock and digital sequential/combinatorial logic. can be generated by using a frequency clock or a dot clock in combinational logic. , or a parallel pulse width modulated signal (n lines) are connected to a multiplexer circuit to output each color and color of the digital color monitor. Select one of the n lines for the intensity line. These multiplexers The input signal is an arbitrary digit (m+1) The digital monitor is driven to generate n colors.

The same technology can be used for example in flat panel color displays, single electron gun color monitors, and and other digital display devices such as other color display devices. can be used. .

These and other objects, features and advantages of the present invention are illustrated in the several drawings. It will become clear after reading the following description of specific embodiments.

Brief description of the drawing Figure 1 is a block diagram of the conventional configuration of a digital color graphics system. Ru. (Prior art) Figure 2 shows a digital color graph with dual port memory. 1 is a block diagram of a conventional configuration of a fix system; FIG. (Conventional technology) Figure 3 shows color table data created with the conventional configuration of Figures 1 and 2. It is a diagram.

FIG. 4 is a timing diagram showing relative signal states for particular color signals.

(Prior Art) Fig. 5 shows a conventional shadow mask CRT, and also shows an electron gun, mask and 2 is an enlarged perspective view, partially broken away, showing expanded details of the relationship between the and mask regions; It is.

Figure 6 shows a color electron beam crossing one pixel in the conventional configuration at full brightness. It is an enlarged view of.

FIG. 7 is a diagram illustrating beam signal states versus time in relation to FIG. 6.

FIG. 8 shows color electrons crossing one pixel subject to modulation conditions according to the present invention. It is an enlarged view of a beam.

FIG. 9 is a diagram related to FIG. 8, showing beam signal states versus time.

FIG. 10 shows a first embodiment of a digital color graphics system according to the present invention. It is a block diagram.

FIG. 11 shows a second embodiment of the digital color graphics system according to the present invention. It is a block diagram.

Figure 12 shows the parallel pulse width modulation generation and multiplication associated with Figures 10 and 11. FIG. 2 is a detailed block diagram of an embodiment of a multiplexer circuit.

Figure 13 shows a pulse width modulation circuit using a high frequency crystal oscillator based on the concept of the present invention. FIG. 3 is a circuit diagram of an example of a circuit.

FIG. 14 shows the relative signal state when multicolor shades are generated based on the concept of the present invention. FIG.

FIG. 2 is a circuit diagram of another example of a pulse width modulation circuit.

FIG. 16 shows a pulse diagram using a hybrid digital delay line based on the concept of the present invention. FIG. 7 is a circuit diagram of another example of the width modulation circuit.

FIG. 17 is a diagram showing an example of the configuration of a video memory in any of the above embodiments. It is.

Detailed description of the preferred embodiment Figure 1 shows the conventional configuration of a digital color graphics system for later comparison. FIG. Central processing unit (CPU) controlled by program memory 2 ) 1 is in communication with the video controller 4. Video controller 4 is video Clean memory 3 is contacted and this is displayed on the screen of digital color monitor 11. Contains information to be displayed. This video controller can also be accessed from the CPUI. Receive updated information for the video screen memory 3. video controller 4 sends serial color information to the red, green, and blue (RGB) lines of monitor 11 and vertically. direct and horizontal synchronization information on lines V and H, respectively. The dot clock generator 9 Dot clock pulses of a specific frequency to the video controller, and more A low frequency clock pulse is given to the CPU1. RGB line is dot clock frequency Serial information in wave numbers is supplied to the monitor 11. The frequency of the dot clock is Determines the number of pixels traversed when scanning across the screen. dot One new color is defined on the RGB lines during each cycle of the clock.

Since the RGB line connected to the monitor 11 is a digital line, there are two sets of voltages. Only the logical value of can be transferred on each line. This is a model with three RGB lines. Limits the number of colors that can be transferred to Nita 11 to a maximum of 23 (or 8 colors) do. Given intensity control, 24 or 16 colors can be transferred to a color monitor. .

Figure 2 is a block diagram showing another conventional configuration of a digital color graphics system. This is a diagram. The CPU 21, which is controlled by the program memory 22, stores system data. It is connected to a video controller 24 via a bus 25. CPU21 and video controller The controller 24 is a dual port monitor used for screen refresh updates. Time division access is performed to the video memory (also called rusk memory) 23. child Time division control is performed by multiplexer 26 on the address lines. Dis The play controller 24 outputs data from the rask memory 23 to the buffer 27. Synchronization is controlled from a synchronization circuit 30 (also called a synchro path). video memory Readings from 23 occur between initialization sync pulses by controller 24.

When the CPU 21 wants to write new information to the memory 23, it is switched by the CPU signal. available. The data output from buffer 27b is output from parallel in converter 28. converted to serial and shifted serially at the dot clock frequency. dot black During each cycle of clock 29, one new color is added to the four digital lines red, green, and blue. and intensity (RGBI) conditions. This RGB I digital model A total of 24 or 16 colors can be generated for the monitor.

FIG. 3 is a table of all colors available on an RGB digital color monitor.

Figure 4 shows the relative signal state for any primary color on an RGBI digital monitor. FIG.

Time periods T1 to T5 are pixel periods.

The red signal can be arbitrarily changed from low to high for low and high states of the intensity signal. maximum le Minance is applied to periods T2 and T4 where both the color and intensity bits are logic 1. It occurs when When the intensity line is low and the red light is high, as in T5, the brightness changes. A low red or dark shade of red is obtained.

Figure 5 is a perspective view of a typical shadow mask cathode ray tube (CRT). A portion of the screen has been cut away and expanded to make it easier to see. electron beam 4 3 is generated from each of the three collar electron guns 42 at the neck of this tube. thin hole A shadow mask 44, which is a perforated metal electrode, is close to and aligned with the screen. The holes 47 in the mask are arranged so that one screen is formed for each primary color dot 46. This corresponds to three groups of three fluorescent dots on 45. Electron gun alignment The electron beam 43 is focused at a point 48 at the center of the shadow mask aperture and then From this point, each beam diverges so that it is incident on each primary color dot. be. Beam sweep consists of conventional line and field scanning coils with external deflection This is done by the yoke 49. These electron beams are digital color graphics It is activated by a digital video amplifier that receives a signal from the circuit.

A pixel window 46 swept by an electron beam 43 according to conventional methods The details are shown in Figure 6. The electron beam 43 covers all pixels shown at 51 in FIG. excited over the entire range. When this beam sweeps the aperture 47 in the mask 44, The phosphor 46 on the screen emits light. Thin cross-hatched section 50 is maximum excitation It shows the point where the maximum luminance is reached. Digital that drives the electron beam The amplifier (not shown) is operating at full bias voltage due to its high intensity line. do.

FIG. 8 is a similar diagram of a beam sweep, but during a vixel period in accordance with the present invention. This shows the case where the beam intensity changes. In Figure 9, the pulse width modulation is set to 52. It shows. The color signal is y1/3 of the pixel period (pixel window ) is logically high, and the period 273 is low. ing.

It is assumed that the intensity line signal is at the middle and high levels of this vixel period.

By exciting the phosphor in a period shorter than the pixel period, The energy given to will decrease. This reduces the luminance of the phosphor. Lower the color shade. The coarse crosshatching area 34 in Figure 9 is the result. shows the luminance of the

FIG. 10 shows a digital color graphic system arranged according to the principles of the present invention. FIG. 2 is a block diagram of one embodiment of a stem. Figure 1 and system elements It can be seen that they are generally similar. hardware for achieving the improvements of the present invention; Changed parts are indicated by 0. Parallel pulse width variable E (PWM) generator selector circuit [10] is added, and the dot clock generator 9 in Fig. 1 is high in Fig. 10. Modified for generation of frequency clock [109]. Parallel PWM generator select The converter circuit (110) receives the data line from the parallel-to-serial converter [108]. Let's go. Converter [108] is a video screen to be displayed on the screen Parallel color pixel information is received from memory 103. Parallel PWM generator selector The circuit [110] receives the high frequency clock in this case from the dot clock generator (109). Driven by lock. The circuit (110) is connected to other circuits from the video controller 104. control information is also received.

The clock driving the circuit (110) is synchronized with the dot clock and this In the embodiment, it is rKJ times the dot clock. The coefficient rKJ is required per electron gun. Depends on the number of color shades. For an example of this parallel PWM circuit, please refer to the color -The number of color shades per line is (2 + 1).

FIG. 11 shows another implementation of a digital color graphics system according to the present invention. FIG. 2 is an example block diagram. This embodiment is generally similar to FIG. same as before Hardware changes for improvements are indicated in [ ]. For the system in Figure 2 The changes made are primarily to the synchropath module 30. The circuit shown in Figure 11 The module is a parallel PWM generator, selector and synchro path (210). It has been changed to . This module [210] is a parallel-series converter 208 or receive serial color information from palette selector memory. palette select The target memory is used when all generated colors should not be displayed at the same time. Often used in place of column-to-series converter 208. Module (210) receives blanking and video information from video controller 204. Ru.

The dot clock generator (209) is a dot clock generator for circuit modules 204 and 208. Generates a lock. This also provides a high frequency clock for the novel circuit (209) of the present invention. cause a problem. The dot clock and this high frequency clock are used to input data to a digital monitor. Digital color generates (2 + 1) shades of color for each color. It is rKJ times the dot clock.

FIG. 12 is a block diagram of one example of a control circuit based on the principles of the present invention. This time The circuit corresponds to the circuit module (110) in FIG. 10 and (210) in FIG. Ru.

Figure 12 shows the PWM day latch 312, parallel PWM signal generation circuit 314, digital PWM signal selection circuits 316-322 for each color control input to the monitor, and It consists of PWM signal line drivers (LD) 324, 326, 228°330.

This new circuit consists of ``digital inputs'' that are logically combined to form a ``sink input'' signal. Video-related signals such as "Display Enable" and "Cursor Enable" handle. For the embodiment shown in FIG. 12, this new circuit also provides parallel PWM generation. It includes a high frequency clock circuit (309) that drives the circuit (310). This new In a typical circuit modification example, a high frequency clock is used to generate parallel PWM signals. A dot clock can be used instead. Other examples of changes include A dot clock is generated from the circuit 314 instead of the generator (309). sink input is logically combined with the selected parallel PWM signal in driver LD. Rai The driver output is connected to a digital color monitor (not shown) via RGB I line 12. (without) input. The embodiment of FIG. 12 has four RGBI lines 12. It's something that's true.

However, this circuit can be expanded to include six-person power or other configurations of digital circuits. -Can be used with a monitor.

The code PWM data in the PWM latch circuit 312 is transferred to the above-mentioned parallel-to-serial converter. Enter from.

FIG. 3 is a detailed diagram of another example digital circuit. In this example, the 4x dot clock has a high frequency. It has been selected as a wave clock.

Clock generator 430 generates a high frequency digital clock signal, which 433 into an inverted clock and a non-inverted clock. these two The clock of the 74AS164 shift register 331 and 432 A state machine 429 consisting of a D gate 334 is driven. This state is better The cycle has a repetition rate equal to 1/4 of the high frequency clock.Duty cycle generates parallel trains of pulses (parallel PWM signals) with varying pulses. Therefore, average The repetition rate of the column PWM signal is equal to the repetition rate of the dot clock. In this example The duty cycles of 6 parallel PWM signals are 25%, 37.5%, and 50%, respectively. , 67.5%, 75% and 87.5%. These parallel pulses are four 8× 1 multiplexer 335-338. These multiplexers are parallel P Functions as a WM selector.

Pulses with 0% and 100% duty cycle are connected to the respective multiplexers 4 44 and 446 to logic low (GND) and high (Vcc) levels, respectively. It is generated by

The desired duty cycle pulse width is determined by a PWM latch (latch not shown). is selected for each pixel period by select line 448 provided by Ru.

These select lines address four 8X1 multiplexers. Respectively Select from the multiplexer for the cursor and display enable conditions. Conditioned by the "sink" input line. The output of these line drivers is This is a pulse width modulated RGB I signal 12. These PWM RGBI line 1 2 drives a digital color monitor with 8 lines per color control line; That is, in this example, 4096 colors that can be displayed simultaneously are generated.

This circuit uses components from the commercially available 74AS series.

However, this circuit can be created using any circuit technology and components. . This circuit is made with a custom or semi-custom chip or chipset. You can also do that. It can also be integrated into programmable chips or hybrids. I can also do it.

The circuit of FIG. 13 can generate even more colors with slight modifications. Also This applies to different digital colors with different digital color power and image resolution. Can be used to drive a color monitor. This monitor has a high image resolution Then, the high frequency clock frequency reaches a very high limit. to avoid this Dot clocks and digital instead of high frequency clocks and shift registers A method using a delay line will be explained.

FIG. 14 is a timing diagram providing relative signal states in comparison to FIG.

In this case, the high frequency clock is assumed to be twice that of the dot clock for the example in Figure 13. Set. The pixel excitation intensity is changed in steps of 25% increase. 5 shades per color line and thus on an RGBI digital monitor. This produces a total of 625 simultaneously displayable colors.

Figure 15 is a detailed diagram of a parallel PWM circuit using a digital delay line and dot clock. It is. Dot clock 509 drives digital delay device 544. This example Then, the digital substitution device 544 applies three equally spaced delays to the outputs DO, Di, and D2. taps and outputs /Do, /D1 and D2 have complementary delay taps. . These six outputs are logically connected to the dot clock at gates 545-549. The combination now produces the desired parallel PWM signal. These pulses are dot clocks has the same period as , and the duty cycle is varied by a variable width pulse. has a file. These PWM signals drive the digital color monitor and output 4096 Generate colors that can be displayed simultaneously.

In general, if a digital delay device has p taps, the color line equivalent It is possible to generate (p+2) shades. digital color monitor has 0 color control inputs (including the intensity control line, if any). If so, you can generate (p+2) (0+1) colors in total and monitor them. can be displayed simultaneously on the screen.

Currently, the digital replacement device has a pX1 multiplexer circuit and p taps. It is available in hybrid form to include a digital delay element. Such a di A digital delay device is used, one for each color control line, in the novel circuit of the present invention. You can build a road.

Figure 16 details an example of a parallel PWM circuit using a hybrid digital delay device. shows. The hybrid digital delay device ff1650-653 has an output “ΔD” ``Four lines each to select one of the 16 delayed outputs'' It has a These delay devices are connected to the dot clock at the CK large input. Game -) 662-669 and a 2x1 multiplexer are connected after this, and the signal “ IY" is output. For each video color control line by desired color value This digital delay device produces one of sixteen delayed clock outputs.

The delayed dot clock output is gated to Y of multiplexers 654-657. Generates a proper PWM signal on one output. Game) 658-661 has 0 strength signal on the output. Used to give a blank number. Select line is video screen Updated for every pixel above.

The PWM output from the multiplexer is the "sink" input signal in the 670 described above. gated to drive the RGBI digital video line. The example in Figure 16 is Emit up to 1048 colors that can be displayed simultaneously on a digital RGBI color monitor It is possible to live. The circuit of FIG. 16 is only one example of the technique of the present invention. . This can be easily expanded to produce more colors on different digital monitors. You can display different colors on the monitor (e.g. 6-color digital monitor). The example in Figure 16 assumes the screen resolution is 640x200. A 14 MHz dot clock is used for the monitor. However, this This technique allows more images to be displayed on screens with different resolutions using different dot clocks. Can be used to generate colors. Figure 17 shows an example of the configuration of video memory. . This is display apple memory 100 and palette memory or palette register. 101. These memories store data from memory 100 in the palette memory. 101. However, the CPU is 101 You can contact. However, the CPU communicates with either memory ( read/write). Display apple memory 100 is rxJ bit 2x rows in palette memory l:I 101 with width 'y' and 'y' bit width. applications can be addressed. Y is greater than X. Palette memory 101 outputs data corresponding to the color intensity of each primary color to be displayed on the monitor. Ru. Therefore, in addition to the combination of 2Y colors in a group, any 2x colors in a group can be displayed simultaneously. You can. This type of memory organization provides memory savings.

From the example above, we can see that a significant increase in the number of color shades that can be displayed simultaneously is due to hardware It can be seen that this is possible without significantly increasing the cost of A. mentioned here A common system of communications is associated with computer-generated sets. However, it is not limited to this.

The common signal can of course come from other storage media, or from real-time transmission. But that's fine.

Also, this memory can display all colors simultaneously even if it is not configured as above. . In conventional technology, video memory is divided into display apple memory and palette memory. It shows that it can be divided.

This takes up all the video memory required unless all colors are displayed simultaneously. This makes it possible to make it smaller. Display apple memory is palette memo ・Which one stores bits/words larger than the display pull memory? Point out. The palette memory is then used to select the desired color.

While particular embodiments of the invention have been shown and described, many changes and modifications will occur to those skilled in the art. Obviously, this is possible without departing from the broader scope of the invention. attached The purpose of the claims is to cover all such claims that come within the true spirit and scope of the invention. It is about embracing change and change.

Engraving (no changes to the content) ~ cI: Re CO~ Engraving (no changes to the content) Engraving (no changes to the content) FIG-/4 Engraving (no changes to the content) Engraving (no changes to the content) Procedural amendment Cj5 rejected Maki, May 19, 1986

Claims (14)

[Claims] 1. Identify the constituent color shade components of each pixel of the color image to be displayed. a memory device that stores a plurality of digital words of coded data and receives said digital word from this memory device, and reads it accordingly. a color shade component that generates a plurality of component signals each corresponding to one of the constituent color shade components; - a signal generator and, in response to said component signal, said component at a corresponding pixel location; Generates pixels with color and shade determined by a combination of signals. a graphic display method consisting of a display device that operates to , the expected relationship is established for the color shade component of the pixel to be displayed. A pulse generator for generating multiple pulses each having different characteristics. of the above pulses in response to the color component limited portion of the input digital word, respectively. a plurality of color component selection devices operative to select a corresponding one of the color component selection devices; an apparatus operative to generate said component signals in response to selected pulses; An improved color signal generator comprising: 2. The graphic display system according to claim 1, wherein the pulse The pulse generators have different pulse widths. 3. The graphic display system according to claim 2, wherein the pulse Each pulse generated by the width generator is passed through a pair of shift registers and the multiple shift registers. Multiple variable duty cycle pulses, each forming one of several pulses simultaneously Logic gates are now generated. 4. The graphic display system according to claim 2, wherein the pulse The clock generator delays the input clock pulse by different scheduled times to generate the plurality of pulses. Multiple digital delay lines that generate pulses with different pulse widths and their Contains logic circuits related to this. 5. The graphic display system according to claim 2, wherein the display Each digital word has a first color component that identifies the first color component of the corresponding pixel. at least three data bits forming a minute limit and a second color of said pixel; at least three data bits forming a second color component confine identifying the component; , forming a third color component defining portion identifying a third component of said pixel. and 3 data bits. 6. The graphic display system according to claim 2, wherein the display The digital word is a first color component limit that identifies the first color component of the corresponding pixel. at least three data bits forming a fixed area and a second color component for that pixel; at least three data bits forming a second color component confine identifying the color component; at least one color component defining a third color component defining a third color component of the pixel. 3 data bits and a color intensity component qualifier that identifies the intensity of that pixel. at least 12 binary data bits comprising at least 3 data bits forming a Consists of. 7. Identify the constituent color shade components of each pixel of the color image to be displayed. a memory device that stores a plurality of digital words of coded data and transfer these digital words to the above memory device and transfer these digital words to the above memory device. each of the constituent color shade components, respectively. a color signal generating device that generates a plurality of corresponding component signals, and each of the component signals described above; determined by the combination of the above color component signals to the corresponding pixel position in response to a display device operative to generate color shades; A large number of color shades are produced in the following stages in the graphic display method. How to live. Different colors each have a predetermined relationship to the color components of the color shade to be displayed. generating a plurality of pulses having specific characteristics; of the plurality of pulses corresponding to each color component limited portion of the digital word. selecting individual ones within and using them to generate component signals. has a color shade corresponding to the digital word using the component signal; The stage of generating and displaying pixels. 8. Claims wherein each of the plurality of pulses has a different pulse width. The method described in Section 7. 9. The plurality of pulses are generated simultaneously with different duty cycles. 9. The method according to claim 8, wherein 10. The pulse has multiple digital pulses for generating pulses with different pulse widths. Claim 7 is generated using a delay line and associated logic circuitry. How to put it on. 11. The digital word includes a first color component identifying the first color component of the corresponding pixel. At least three data bits forming one color component confinement and the pixel's at least three data forming a second color component limit identifying a second color component; a third color component limiter that identifies the third color component of the pixel; at least nine binary data bits forming at least three data bits; 8. The method according to claim 7, comprising: 12. The digital word includes a first color component identifying the first color component of the corresponding pixel. At least three data bits forming one color component confinement and the pixel's at least three data forming a second color component limit identifying a second color component; tapit and a third color component limiter that identifies the third color component of the pixel. at least three data bits to form and a color identifying the intensity of that pixel and at least 3 data bits forming an intensity component limit. 3. A method as claimed in claim 2, comprising binary data pits. 13. The graphic display method according to claim 2, wherein the Each digital word has a first color that identifies the first color component of the corresponding pixel. - at least three data bits forming a component confinement and a second type of the pixel; at least three data bits forming a second color component confine identifying the color component; and a third color component limiter that identifies the third color component of the pixel. at least 8 binary data bits including at least 2 data bits Become. 14. The digital word includes a first color component identifying the first color component of the corresponding pixel. At least three data bits forming one color component confinement and the pixel's at least three data forming a second color component limit identifying a second color component; a third color component limiter that identifies the third color component of the pixel; at least 8 binary data bits forming at least 2 data bits; 8. The method of claim 7, comprising: