JPS62103695A - 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 [Technical Field of the Invention] The present invention relates to a color display device having a paper white display function for displaying characters, two figures, etc. in an information processing device.

[Technical background of the invention and its problems]

In information processing equipment that uses a CRT display device as a display section, it is desirable to provide means for reducing eye fatigue experienced by the operator when visually viewing the CRT display device W. Therefore, a display form called paper white display is used in monochrome CRT display devices.

This controls the display of the entire CRT tube surface in white or a color close to white, and controls and displays the characters and figures to be displayed in black (the background color of the tube surface), making it look like a white paper. By making it look like a black pencil has been written on it, the operator's eye irritation is kept constant and fatigue is reduced. At this time, the casing part (escutcheon) around the tube surface is also CR.
The color is designed to be close to the color emitted by the T phosphor.

On the other hand, in recent years, color display devices that provide operators with a large amount of information accurately through color coding have become popular, but these display devices do not have paper white displays, which can cause operator fatigue. There is.

[Purpose of the invention]

An object of the present invention is to provide a color display device that can easily implement paper white display in color display with a relatively simple configuration, reduce eye fatigue on the operator, and improve the working environment. do.

[Summary of the invention]

In a display device having a bitmap memory having a plurality of memory plane structures, the present invention outputs display data successively outputted from the bitmap memory in synchronization with the display timing during a display period, and During the period, a means to output display data of a specific color and a means to receive each display data,
It has a configuration that includes a palette that outputs display color data according to the bit contents and a means for rewriting each display color data of this palette.This makes it easy to use a color display device with a relatively simple configuration. A paper white display function can be realized, reducing eye fatigue for operators and improving the working environment.

[Embodiments of the invention]

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of main parts according to an embodiment of the present invention.

In the figure, llI:l is a microcomputer (μP) that controls color display control. 2 is a bitmap memory (BMM) that stores color pixel data for one screen, and here four memory planes (PLANE7, PLA
NE2. PLANEs, PLANE4) 2-1
．． 2-z, z-s.

Consists of 2-4. 3-1, 3-2.3-3゜3-
4 is a shift register (SR-1, 5R-2, 5R) that converts the parallel data of each memory plane 2-1, 2-2, 2-3, 2-4 sequentially outputted from the bitmap memory 2 into serial data. -s, 5R-4)
It is. Reference numeral 4 denotes a poder color register (BCR) that holds set values from the microcomputer 1. 5 is the output of the border color register 4 (104-z).

104-2, J o4-s, J o4-4),
Or shift registers 3-1, 3-2, 3-3, 3
This is a selector for selecting one of the outputs of -4 as a display target. 6 is the 4-bit output of selector 5 (ZOS)
This is a pallet that outputs the data stored in the address area using 8 as an address, and the data at each address can be set (written) by the micro combiator IK.
7 is the output C1ot;-y, 1oe;-e of pallet 6
.

, 1o6-o) to a video signal (71117), and 8 is a CRT display that receives the video signal (1OV) output from this amplifier 7 and outputs it as a color image. 9 is a display control unit that generates various signals necessary for display control.

Figure 2 (al is a conceptual diagram showing the structure of the pallet 6;
bl is an explanatory diagram showing the contents of the palette 6.

FIG. 3 is a circuit diagram showing the structure of the amplifier 7. 7-1 is an amplifier for red (R), 7-2 is an amplifier for green (G), and 7-3 is an amplifier for blue (B). It's an amplifier.

Now, the operation of one embodiment will be explained with reference to FIGS. 1 to 3.

The microcomputer 1 sequentially sets 8-bit 8 values corresponding to the colors to be displayed for the entry addresses "oooo" to "1111" in the palette 6.The next pixel data to be displayed is to be displayed. One or more memory planes (PLANE-i (i=1.2°3+'
)). Now, for example, the entry address "oooi" of palette 6 is 100000000.
Set the data of “000” in bitmap memory 2.
1” (zz.

2-2.2-3="O", 2-4="l"), then
This data is displayed in red (R).

On the other hand, during the retrace period (here refers to all data non-display periods except the data display period), the retrace signal 10g is output from the display control section 9, and only during this period the selector 5 controls the poder color register 4. Select output and go to Palette 6
Send to. Therefore, during the retrace period, a color corresponding to the data of the entry address of the palette 6 according to the data contents of the border color register 4 is displayed.

The CRT display 8 is equipped with an overscan function.
During a certain predetermined portion during the flyback period, the output of pallet 6 (1o
e-y, 1oe-e,...

1ot;-o), that is, the display color determined by the data content of the address of the palette 6 specified by the border color register 4. The structure of the pallet 6 at this time is shown in FIG.
-2°103-3, 103-4), each entry consists of 8 bits. The contents of each entry can be rewritten by the microcomputer 1. This 8-bit data 106-7
, 106-6,...ν.

106-0 is assigned to the R, G, and B color signals as shown in Figure 2 (bl), so that when all "o" it is [black] and when all "'1" is [white]. It is connected to the next stage amplifier 7. The structure of this amplifier 7 is shown in Fig. 3. In the figure, amplifier 2-1 is red (R), amplifier 7-2 is green (G), -3 corresponds to blue (B), and the output of pallet 6 is 106-7°10 as shown in the figure.
6-6, . . . , 106-0 are supplied. The output values corresponding to the input states of these signals are R and G.

B color video reconnaissance 107-1, 107-2.1
It is supplied to the CRT display 8 as 07-3. In this example, 256 types of colors can be displayed.

Each display mode including paper white display will be explained below.

A. Paper white display mode... When this mode is specified externally, under the control of the micro combiator 1, the border color register is set to the same value as the initial value of the pit map memory 2 "oooo"
" is set. Also, the entry number of palette 6 "oo
The data “11111111” is set in “oo”, and the data of all “0” is set in the other entries. As a result, the pixel data written in any memory plane of the pit map memory 2 is set. It is displayed in black even if the

Mode 2: When this mode is designated, the same value as the initial value of the pit map memory 2, ``'oooo'', is set in the poder color register 4. Further, data of all "1" is set in the entry "oooo" of the palette 6, and data of all "'0" is set in the next entry "0001".

The contents of other entries remain unchanged. The brain of the pit map memory 2 to which data is written is only one memory plane 2-4, and all data is written to this brain.

Mode 3: When this mode is designated, the same value "oooo" as the initial value of the pit map memory 2 is set in the border color register 4. Also, the data contents of each entry in the palette 6 are all inverted to ``1'' and ``0''. In other words, the entry ``@oooo'' originally had all '
Data of ``0'' is set, and as a result of inversion, all ``1'' results. Further, data of all "1" is set in the entry ``1111'', and as a result of inversion, the data becomes all "'O". As a result, on the Paper White screen, white is displayed as black, black is displayed as white, and other colors are displayed as complementary colors.

Mode 4: When this mode is specified, the border color register 4 is set to the same value "oooo" as the initial value of the pit map memory 2. Also, the entry "oooo" and '1111' of the palette 6 are set. "" is inverted from all "'0" to all "'1" and from all "1" to all "0", and the other colors are not inverted. As a result, on the paper white screen, white is black, black is white,
Other colors are displayed in their it color.

B. Set all l'0' data to the entry of the palette 6 according to the contents of the normal display poder color register 4. Set the data of all '0' to the entry of the palette 6 corresponding to the initial value of the pit map memory 2. is set. Specified values are set in other entries. This causes normal display mode display.

C0 screen protection display When the operator does not operate this device for a certain period of time, or when this device is not accessed from the host side for a certain period of time, the contents of the current palette 6 are saved and a replacement is displayed. and set a specific value depending on that value.

For example, the red (R) part shown in Figure 2(b) is
Anything larger than 10" should be set to '010', and anything smaller should be left as is. Also, the green (G) part is also red (R)
Do the same as. For the blue (B) part, if it is larger than 01", set it to "oi", and if it is smaller than that, leave it as is. Screen protection display can be performed by suppressing the color level at the border. .

Under this display mode, when an operator performs an operation or there is an access from the host side, the saved values are restored.

In the above explanation, we have described the case where the contents of border color register 4 and the initial value of bitmap memory 2 are the same ``0000'', but even if they are different, the operation is the same except that the background color on the screen is different. It is clear that

Next, another embodiment of the present invention will be described with reference to FIG.

The configuration shown in FIG. 4 is particularly different from the configuration of the embodiment shown in FIG.
Pull-down/pull-up resistor 10-J, 1 instead of
0-2, IO-3, 10-4 to each memory plane 2-1, 2-2, 2-3 of bitmap memory 2.
, 2-4, and shift registers 3-1, 3-2, 3-
3.

It is provided between 3 and 4.

With such a configuration, during the retrace period, each memory plane 2-1, 2-2, 2-3 of the bitmap memory 2 is connected by means not shown in the retrace signal 10g.
, 2-4 are set in a floating state. Specifically, for example, each of the memory planes 2-1, 2-2,
2-3.

A three-state gate is interposed at the output end of memory plane 2-4, and the gate is connected to the output end of memory plane 2-1.2-2゜2-3.2-4 by retrace signal 108 from display control section 9. and resistance 10-1゜10-2, 10-3, IO
-4 are connected to shift registers 3-1, J-2,
This can be easily achieved by insulating between the input ends of 3-3 and 3-4. As a result, the output level of each memory plane 2-1, 2-2, 2-j, 2-4 varies depending on the pull-down or pull-up state (Vaa level/GND level). -3, 10
2-4 is determined, and the same effect as when outputting the specific value set in the border color register 4 is achieved in the case where the switching is performed by the selector 5 shown in FIG. Other operations are the same as those in the above-described embodiment, so their explanation will be omitted here.

By using the above-mentioned pallet configuration,
Paper white display in color display can be easily realized with a simple configuration. As a result, eye fatigue for the operator can be reduced, and a favorable working environment can be realized.

〔Effect of the invention〕

As detailed above, according to the present invention, in a display bag having a bitmap memory having a plurality of memory plane structures, the bitmap memory is read out in synchronization with the display timing during the display period. output the displayed data,
During the blanking period, means for outputting display data of a specific color, a palette for receiving each display data and outputting display color data according to the bit contents, and means for rewriting each display color data of this palette. By adopting the configuration, it is possible to easily realize a paper white display function in a color display device with a relatively simple configuration, which reduces eye fatigue for the operator and improves the working environment. I can do it.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 (
al is a conceptual diagram showing the structure of the palette in the above embodiment; bl is a diagram for explaining the contents of the palette;
FIG. 3 is a circuit diagram showing the configuration of the amplifier in the above embodiment, and FIG. 4 is a block diagram showing another embodiment of the present invention. 1... Microcomputer (μP), 2... Bit map memory (BMM), PLANEz. PLANEz, PLANEJ, PLANEJ...
Memory plane, 3-1.3-2.3-3.3-4...
・Shift register (SR-1, 5R-2. 5R-s, 5R-4), 4...Poder color register (BCR), s...Selector, 6...Palette, 7...Amplifier , 8... CRT display, 9... display control unit, 10-1, 10-2, 1θ-3, 10-
4...Pull-down/pull-up resistor. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3

Claims (10)

[Claims] (1) A bitmap memory that stores display data and has a structure of multiple memory planes; during the display period, display data read from the bitmap memory is output in synchronization with the display timing; during the retrace period, the display data is read out from the bitmap memory; A means for outputting a display deco of a specific color, a palette for receiving each of the display data outputted by the means and outputting display color data according to the bit contents thereof, and means for rewriting each display color data of this palette. A color display device comprising: (2) The color display device according to claim 1, wherein the rewriting of each display color data of the palette is executed according to a mode specification. (3) The display data of a specific color output during the retrace period is held in a rewritable state.
Color display device as described in section. (4) The color display device according to claim 1, wherein the display data output during the flyback period and the initial value of the bitmap memory have the same data content. (5) Selectively set white data as the display color data of the palette specified by the display data output during the retrace period, the initial value of the bitmap memory, or both, and other 3. The color display device according to claim 2, wherein black data is selectively set as display color data of the palette. (6) Selectively set white data as the display color data of the palette specified by the display data output during the retrace period, the initial value of the bitmap memory, or both, and 3. The color display device according to claim 2, wherein display color data of a palette in which white data is set during display mode is selectively replaced with black data. (7) Selectively set white data as the display color data of the palette specified by the display data output during the retrace period, the initial value of the bitmap memory, or both, and In a display mode, display color data of a palette where white data is set is selectively replaced and set with black data, and display color data of other palettes is selectively set by bit inversion. Color display device according to scope 2. (8) Write the display data to only one specific memory plane of the bitmap memory, selectively set black data as the display color data of the palette specified by the output data of the memory plane, and Claim 2, wherein white data is selectively set as the display color data of the palette specified by the display data output during the flyback period, the initial value of the bitmap memory, or both. Color display device as described in section. (9) In the display state, when there is no operator operation for a certain period of time, the display color data on the palette is checked, and if the display color data exceeds a predetermined level, it is written at a predetermined level. 2. The color display device according to claim 1, wherein the color display device returns to its original level when an operator performs an operation. (10) In the display state, when there is no access from the host device for a certain period of time, the display color data of the palette is checked, and if the display color data exceeds a predetermined level, a predetermined 2. The color display device according to claim 1, wherein the color display device rewrites the level to the original level and returns to the original level when access from a host device occurs.