JPS6017490A - Color 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] [Field of Application of the Invention] The present invention relates to a color display device, which is, for example, an output device of an electronic computer, and is capable of easily displaying a large number of colors with a small memory capacity. .

[Background of the invention]

In recent years, the number of computers called microcomputers constructed from several large-scale integrated circuits has expanded dramatically. As a result, input/output devices, which are a means of interaction between electronic computers and humans, are desired to have advanced functions and be easy to operate, especially color display devices capable of graphic processing. It is gradually becoming popular because it meets the demands of temperature. A color display device has a memory inside it, and once the information sent from an electronic computer is stored in this memory, the stored information is repeatedly read out and displayed on a round tube or screen.

There is an IJ power rack device that displays on a display device such as a lasma display.

Information is usually stored in a graphic display device by dividing the information to be displayed into picture elements and assigning each picture element to one bit of memory. Therefore, when storing and displaying a white spot image, a memory capacity equal to the number of picture elements is required. In the case of color images, for example, there is a method shown in Japanese Patent Publication No. 51-4887S5. This method divides the memory area to be recorded into areas corresponding to each color component, and divides the graphic information with color information sent from the computer into each color component and stores them in each area of the memory. In this method, each color component is combined during playback to display the color. - The number of colors that can be displayed when the membrane pressure memory is divided into N is limited to 2N colors, including white and black. Therefore, displaying many colors requires a large amount of memory and is expensive. On the other hand, there is the following method shown in Japanese Patent Application No. 52-53071 which can display a large number of colors with a small memory capacity. This method records a plurality of color information in a plurality of registers, stores selection information for selecting the register in a memory for each pixel on the display screen, and stores registers determined by the selection information stored in the memory. choose,
Color information for each picture element is obtained from the color information recorded in the selected register (hereinafter, this method will be referred to as a register selection method). FIG. 1 is a block diagram of a color display device using a register selection method. In FIG. 1, 1 is a control unit 2 is a color display unit;
Wow, 4 is electron! t: Connection line with Li machine (hereinafter referred to as interface), 5 and 6 are terminals, 7 is a buffer circuit, 8 is memory, 9 is an address switching circuit for setting the information storage address of memory 8 (hereinafter referred to as address switching circuit). (abbreviated as circuit), 1
0 is a synchronization circuit, and 11 is an address generation circuit that generates an address signal when reading information stored in the memory 8.

Further, 12A to 12D are registers, 13 is a color selection circuit,
14 is a buffer circuit, 15 is a decoder circuit of the color selection circuit 13, 16 is a register selection circuit of the color selection circuit 13, 17
18 is a deflection circuit, and 19 is a color cathode ray tube. Furthermore, FIG. 2 is a block diagram showing the concept of command words of an electronic computer for controlling the color display device shown in FIG. 1, and is an example of a structure of 16 bits per command. Figure (α) shows a command to designate the coordinates (X, F) of the display screen on the cathode ray tube 19 and data to be recorded at the coordinates, and the phrase (phrase in the figure) shows a command to designate the color.

In FIG. 1, memory 8 includes a core memory.

Although non-semiconductor memories such as disk memories can also be used, the following explanation assumes that a semiconductor random access memory is used. Although it is possible to use other display devices such as a plasma display as the display device of the color display section 2, the description will be made assuming that a color cathode ray tube 19 capable of driving three primary colors (R-G-B) is used.

through the interface 6 connected to the terminal section 5.
A signal corresponding to FIG. 2(h) and a strobe pulse indicating that this signal is being transmitted are transmitted from the electronic computer, and a signal corresponding to FIG. A strobe pulse indicating that this signal is being transmitted is transmitted from the electronic computer.Buffer circuits 7 and 14 output a pulse signal when receiving the strobe pulse.

When the address switching circuit 9 receives the pulse signal from the buffer circuit 7, it records the data transmitted from the computer as shown in FIG. 2 (α) in the memory 8 for each address, that is, for each picture element, and When no signal is received, the data stored in the memory 8 is supplied to the decoder circuit 15 in response to the read address signal from the address generation circuit 11. Note that the synchronization signal generated by the synchronization circuit 10 is transmitted to the deflection circuit 18 of the color display section 2 at the same time as the address generation circuit 11.
Therefore, the reading operation from the memory 8 and the deflection operation by the deflection circuit 18 are synchronized.

On the other hand, when the registers 12A to 12D receive the pulse signal from the buffer circuit 14, they record the signals shown in FIG. 2<b> transmitted from a total of η4 machines.

The contents of color designations A to D shown in FIG. 2(A) are recorded in the registers 12, 4 to 12D, respectively. The decoder 15 decodes the data read from the memory 8 and supplies it to the register selection circuit 16, and the register selection circuit 16 selects the register corresponding to this decoded signal from the register 12A.
-12D and supplies the color information recorded in the selected register to the color synthesis circuit 17. The color synthesis circuit 17 synthesizes the supplied color information and generates red, green, and blue primary color signals for driving the color cathode ray tube 19.

Further, there is a method called a window counter method to reduce the memory capacity, which is different from the register selection method described above. This method will be explained with reference to FIG. FIG. 3 is a perspective view of a window counter type color display device, in which 20 is a color display device, 21 is a perspective view of a window counter type color display device;
is a color cathode ray tube screen. An area 22 surrounded by a broken line on the screen 21 is a feature of the window counter method, and information is displayed only within this area and not around it. This method focuses on the fact that information is rarely displayed in the periphery of the screen 210, and omits the memory in the periphery, and requires memory corresponding to the area excluding area 22, which reduces the memory capacity. You can reduce it by a bit. but,
This window counter method has the following two drawbacks.

1) A boundary is created between the peripheral part of the screen and the information display area 22, and the peripheral part becomes frame-shaped. Therefore, if the color of the displayed characters in the information display area 22 and the color of the peripheral part 21 are the same, the information There is a risk that characters displayed at the end of the display area 22 may be erroneously recognized. In other words, when the characters "1B" are displayed at the edge of the information display area 22, the color of the characters and the color of the surrounding area are 4- (for example, when the characters are written in black on a white background).
There is a risk that "FB" may be mistaken as "3". Furthermore, nowadays, kanji information display is becoming very important, but in the case of kanji display, the outer edge of the single character display area Fl
Since up to i is used for display, the edge of the information display area! li
Missing characters and misidentification become even more noticeable when K kanji is displayed. For example, the character for ``old'' looks like ``1-day.''
“Four” means “F”, “hundred” means “white”, “dan” means “day”
There is a risk that it may look like

2) Depending on the performance of the color graphic display device, distortion may occur on the screen.

In a color cathode ray tube used in a color graphic display device, the power supply that applies voltage to the anode of the cathode ray tube has an internal resistance of several MΩ, so when the beam current fluctuates, the voltage at the anode also fluctuates. Since this voltage is a voltage that accelerates the electron beam, if there is a fluctuation in the voltage, the position where the electron beam reaches on the cathode ray tube surface will fluctuate. If the beam current changes significantly and suddenly, the variation in the reached position becomes noticeable, resulting in distortion of the image displayed on the screen. In the case of the window counter method, there is usually a difference in brightness and color between the frame-shaped periphery and the area 22, and the beam current changes suddenly at the boundary, resulting in screen distortion. Particularly when a home television receiver is used as a color display device, screen distortion becomes extremely noticeable.

[Purpose of the invention]

The present invention eliminates erroneous display of character information and distortion of one screen.
To provide a color display device capable of preventing missing characters.

[Summary of the invention]

According to the present invention, the color information written in the register selected by the register selection means of the register selection method and the color information stored in the register determined as the display color of the peripheral part of the information display area are selected according to the wind pulse. It is characterized by switching.

The present invention will be explained below using the drawings. 4th 1 is a block diagram showing the first embodiment of the color display device according to the present invention, and is a waveform diagram based on FIG. 5. In FIG. 5, (α) to (d) and (e) to Ch) are shown on the same time axis. A vertical synchronization signal and a horizontal synchronization signal generated by the synchronization circuit 10 are supplied to a deflection circuit 18 and an address generation circuit 11. Figures 5(a) and C! I)
(C) shows the horizontal synchronization signal, and (C) shows the vertical synchronization signal. The address generation circuit 11 is supplied from a circuit that generates a read address signal (hereinafter referred to as 1D pulse) whose period is the time required to horizontally scan one pixel, a horizontal counter that counts 1D pulses, and a synchronization circuit 10. It consists of a vertical counter that counts the horizontal synchronization signals
The counter is used to define one picture element within the information display area, and for example, one picture element is defined as one horizontal counter bit and four vertical color pits (four scanning lines). The 1D pulse is not shown in FIG. 5(h). The output of the address generation circuit 11 is supplied to the address switching circuit 9 and the window pulse generation circuit 23. Wind pulse generation circuit 23
Then, the 1D pulses supplied from the address generation circuit 11 are counted by a predetermined number it from the horizontal synchronizing signal to generate horizontal wind pulses as shown in FIG. 5(C) and <h)K. The wind pulse is determined in advance so that the logic H corresponds to the information display area. This wind pulse is generated by the selection signal generation circuit 24 and the gate circuit 2.
The selection signal generation circuit 24 generates a selection signal for selecting one of the registers 12, 4 to 12D in the area excluding the information display area, that is, in the peripheral fl11.

The selection signal generated by the selection signal generation circuit 24 is supplied to the register selection circuit 28 in the gate circuit 26 of the color selection circuit 25. The gate circuit 26 further includes one of the registers 12A to 12D selected by the register selection circuit 16.
Color information read from two registers is supplied. In response to the selection signal generated by the selection signal generation circuit 24, the register selection circuit 28 selects one of the color information in the registers 12, 4 to 121) and supplies it to the gate 27. The wind pulse supplied from the wind pulse generation circuit 23 to the gate 27 selects either the gate 2, the register selection circuit 2, or the output from the register selection circuit 16, and sends the color information to the color synthesis circuit 17. supply In order to simply explain the operation of the gate circuit 26,
The discussion will proceed assuming that register selection circuit 2B has selected register A. In FIG. 4, the gate 27 is supplied with color information from the register 12A and the register selection circuit 16, and is further supplied with the color information from the wind pulse generation circuit 23.
The gate signal supplied to 7 will be explained as having the same waveform as the wind pulse shown in FIGS.

When the gate signal is logical H, that is, in the information display area, the gate 27 supplies the color information supplied from the register selection circuit 16 to the color synthesis circuit 17, and when the gate signal is logical, that is, in the peripheral area, the color information supplied from the register 12. supply information; The color synthesis circuit 17 synthesizes the supplied color information and generates red, green, and blue primary color signals for driving the color cathode ray tube 19. FIG. 5(f) shows a vertical wind pulse. When the vertical wind pulse is logical, the color information from the register 12A is supplied to the color synthesis circuit in the same way as in the case of the horizontal wind pulse.

Note that the peripheral display colors are registers 1'2 A to 12.
When selecting D, if registers 12A to 12D are selected so that the brightness and color are the same as the background of the information display area, no frame will be generated at the periphery of the color cathode ray tube screen, so the information will not be displayed on the screen. There is no LIT that causes distortion or missing characters in the recorded images.

FIG. 6 shows a second embodiment of the invention.

Components that are the same as those in FIG. 4 are given the same reference numerals.

This embodiment differs from the selection signal generation circuit 2 in the first embodiment.
4 is equivalent to the case where the same register is always selected, and the case where registers 12 and 4 are selected is shown as an example.

The gate 27 is supplied with color information from the registers 12 and 4 selected in advance as the display color of the peripheral area and color information from the register selected by the register selection circuit 25 in accordance with the register selection signal from the memory 8. Ru. Furthermore, a wind pulse from the wind pulse generation circuit 23 is supplied to the gate 27 as a gate signal.

When the wind pulse is a logic H indicating an information display area, the color information from the register selected by the register selection circuit 25 is supplied to the color synthesis circuit 17.

If the wind pulse is logically indicating the peripheral area, the color information from the registers 12 and 4 is supplied to the color synthesis circuit 17.

Also in this embodiment, if the color information stored in the registers 12 and 4 is always set as the background color of the information display area, problems such as screen distortion and missing characters can be prevented. It goes without saying that if the colors of the W scenery and the surrounding area are similar in brightness and color, the same effect can be obtained even if they are not necessarily the same.

Further, as shown in FIG. 7, if a register 29 storing peripheral color information is provided at 5 and this register is selected as the peripheral register, the same effect as in the second embodiment can be obtained.

[Background of the invention]

According to the present invention, it is possible to prevent missing characters and erroneous display caused by the peripheral portion of the information display area on the screen forming a frame shape. Furthermore, it is possible to prevent screen distortion due to sudden changes in beam current at the boundary between the information display area and the peripheral area.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a color display device using a conventional register selection method, and FIG. 2 is a 1'lA. FIG. 3 is a perspective view of a conventional window counter type color display and dog play device; FIG. 4 is a block diagram of a color display device showing an embodiment of the present invention; FIG. 5 is a waveform diagram in a color display device according to the invention, FIG. 6 is a block diagram showing another embodiment of the invention, and FIG. 7 is a block diagram showing still another embodiment of the invention. 2・・・・・・・・・・・・・・・・・・・・・・・・
・・・Color display section 8・・・・・・・・・・・・・・・
・・・・・・・・・Memory 12A to 12D...
···register

Claims (1)

[Scope of Claims] t. A color display device having a color synthesis means for synthesizing color signals according to color information for each display unit and outputting the color signal to a color display means connected to the color synthesis means, a plurality of storage means in which various types of color information are recorded in advance; a memory storing a selection signal for selecting one of the storage means for each display unit of the information display area of the color display means; a selection means connected to a storage means for selecting one of the storage means according to the selection signal read from the memory and outputting color information read from the selected storage means; and information on the color display means. Wind pulse generating means for generating a wind pulse for switching between the display area and the peripheral area of the information display area; a predetermined one of the memory means; and a wind pulse generating means connected to the wind pulse generating means and responsive to the wind pulse It is characterized by comprising a gate means for selecting one of the color information read from the one predetermined storage means and the color information read from the storage means selected by the selection means and supplying it to the color synthesis means. color display device. 2. The color display device according to claim 1, wherein the one predetermined storage means is a storage means that stores a background color of display characters in the information display area. 3. In a color display device that has a color synthesis means for synthesizing color signals according to color information for each display unit and outputs the color signal to a color display means connected to the color synthesis means, various color information may be stored in advance. a first storage means selection means for selecting one of the storage means for each information display unit of the color display means; and a first storage means selection means for selecting one of the storage means for each information display unit of the color display means; and information display of the color display means from the storage means. selection signal generation means for generating a second storage means selection signal for selecting one storage means corresponding to the display color of the peripheral portion of the area; and a selection signal generation means connected to the selection signal generation means and connected to the second storage means selection signal a second storage means selection means for selecting a storage means corresponding to the signal from the storage means based on the selection and outputting the color information stored in the storage means; and the information display area of the color display means; wind pulse generation means for generating a wind pulse for switching the peripheral portion; and wind pulse generation means connected to the first and second storage means selection means and the wind pulse generation means and configured to select the first and second storage means according to the wind pulse. A color display device comprising gate means for supplying color information read from the storage means selected by one of the storage means selection means to the color synthesis means.