JPS6173994A - Crt 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] [Industrial Field of Application] This invention is applicable to a computer used as a display device for an electronic computer, etc.
Regarding the RT display device, the distance between the display control device and the CRT display device that controls the CRT display device can be remote without the total image quality t1''.
'RT display device Vc flashes.

[Conventional technology]

For example, an example of this type of CRT display device is shown in FIG.
There was a construction shown in Figure 4.

Figure 3 shows 2 work and Figure 4 shows 3, and (1) is a buffer memo.
, (2) t'! Colorman Bucheeple S (81B D
/A converter, (4) is transmission cable s (5) B C
The RT 7' chair display device (6) is a companion display i1i control device except for the CRT display device (5).

With the configuration Vc2 shown in FIG. 3, the CRT display device 1c
? Analog outputs are sent as inputs to D/A converters (8) corresponding to red (R), back fBJ, and green (G) for displaying dot colors. The input n bits of this D/A converter (8) are given from the color map table (2).

This color map table (2) K is R in advance,
All luminance information for the three colors G and B is retained.
CRT display installation (buffer 1 memory (1) corresponding to 5 inch display screen) VC to CRT display 1 inch
Address m focus of the column map table is stored at the address corresponding to the dot in f(5).

In this way, the color map table address of the color to be displayed is given to the buffer memory (1) corresponding to the display screen, and the 19 color map table 1 is read out fLD/A.
CRT display equipment through a converter! (5) VC
The color you want to display will be displayed.

Unfortunately, the color map table (2) shown in Figure 4 is completely deleted, and the brightness information for each color is stored in the buffer memory (1). : The signal is input directly to the D/A converter.

[Problem that the invention seeks to solve]

The above (4-component conventional CRT display device (5) is connected to the display control device (6) by a transmission cable (4). This transmission cable (4) is, for example, 5 (, '2V, 7C2V).
Uses equivalent coaxial cable.

In modern graphic display devices, the dot resolution of the display screen has also increased, and the video frequency for the CRT display has increased to 50 to 100 Mllz29. Display device (5)
The distance between the display control device ffi (6) and the display control device ffi (6) is several meters, and in such a case, the voltage value of the video output is attenuated in proportion to the total distance between them due to the characteristics of the coaxial cable. For example, if a 5L'Δ coaxial cable is used, there is an attenuation of about 604B/1 (m) at s 50 MHz.

In addition, as shown in Fig. 5, lines (#
a) and (71b), there was a problem that the brightness would be different. f'L is the horizontal line <, lb) is 1
The vertical line (2a) is output for one line, but the vertical line (2a) is for one dot, and as shown in Figure 6, the video output value is higher than the video output value (Vli) for the horizontal line (7!b). The video output f[(V,) for line (la) of
There is a difference in signal transmission due to waveform differences and frequency differences.

As mentioned above, as long as coaxial cables are used for all purposes, attenuation of the voltage value of the video output is inevitable, and increasing the distance between the display control device and the CRT display device increases the attenuation. This type of computing system has limited freedom of movement.

In order to solve all the above-mentioned problems with this invention,
To obtain a CRT display device which has a high degree of freedom fC in an electronic computer system by increasing the distance IQ between the display control device and the CRT display device with extremely little attenuation of the PITEO output signal 1 using Lfc. The purpose is to

[Rounding method to solve problems]

A CRT display device according to the present invention is a CRT display device according to the present invention.
Karamap table 2 and D/A on the display device side
An optical fiber transmission section is used to arrange converters and the like and to electrically connect the display control device side.

[Effect]

The display control device side converts the video frequency into a digital signal of a lower frequency, and this digital signal is sent to the all-optical fiber transmission section and sent to the color map table on the CRT display device side as shown in block diagram ``T''. In Figure 1C2, the buffer memory (6) is the same as the conventional one, but one memory cycle iCN pixel (1 pixel bit) is read in parallel according to the total video signal frequency. part, α is Transminc α3), optical fiber cable Q4),
In the optical fiber transmission section consisting of receiver 051, after receiver o5), the CRT display device is kept waiting on the tray side, that is, the color map table (16) is selected for full time division output of multiple color map tables (16). It includes a selector Uη and a D/A converter 08).

On the other hand, the buffer memory (6
), parallel/serial converter (Isao, Transminc (
It consists of alcohol.

In FIG. 1, a plurality of parallel/serial converters (12j
Pass through all. In this case, M-pixels are processed in parallel in a time-division manner in the parallel/serial conversion section. Optical fiber transmission section (19
) The frequency is sufficient for VC. By the way, for example 1
When transmitting at a video frequency of 00 MHz, 1t cycle 8
00 n8 and read out 80 pixels in 8 pixels in parallel, the parallel/serial converter (if you have 4 layers in parallel, the frequency sent to the CR display device side is 2
Processed at 5 MHz. O Then CRT display device□
The serial data for n 7tM pixels sent to the □□ side becomes the address of the color man button α6), and the red @) is sent to this output.

There are n pits for each of the back (B) and green (G) components. Here M
Time-division processing is performed on t-An pixels, which are then selected according to the video frequency by a selector Q7) and are finally input to a D/A converter (E).

The flow of this data is shown in Figure 2, where @11 reads fLfc data from the buffer memory (6) in parallel with M pixels, and A6 parallel/serial converters (6 parallel/serial converters) The data is shown in -.This data is sent to address n1 of color map table α6).
Output data 1R11c of the color map table is shown. The data selected by the selector +117) for one dot of video frequency in parallel processing is the data input to the D/A converter (G).

The output of this D/AK converter (to) becomes the output.

In the above process, a digital signal with a lower frequency than the video frequency is transmitted to the CRT display device (16) through an optical fiber transmission section (llt-m), and the CRT display device is placed at the back of the device (2) and the color map table (16 )'
k "threat" and finally becomes a video signal.

By conveniently using optical fiber cables, the display control device (21) and C
The distance between the RT display devices (a) can be extended.

2. In the above embodiment, the CRT display device shown in FIG. 1 has a color map table (16) on the back side.
and selector (b), but the gradation is low (D/A
Converter (if there are few input bits) the video signal is 5
CRT display device VC's below 0 MHz? In addition, the color map table α6J is also connected to the display control device (2
It would also be possible to arrange it on the 11 side and make the hardware configuration of the CRTf1 spray device W2 side into a subsystem.

〔Effect of the invention〕

In accordance with the above two aspects of the present invention, the first step is to connect the CRT display device and the display-side Cl41 device using the original fiber transmission section,
Moreover, since the D/A converter is placed on the side of the CRT display device, the #c ratio of the video output signal is extremely small, and the total distance between the CRT display device and the display control device is extended. This kind of electronic computing system increases the degree of freedom that it is possible to use.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall structure of a CRT display device according to an embodiment of the present invention, and FIG. Figures 3 and 4 are block diagrams showing an example of the configuration of a conventional CRT display device; vertical. FIG. 6 is a graph showing the difference in video output between the vertical and horizontal lines. In the figure, (6) is the buffer memory, (parallel μ parallel/serial converter, α~ is the transmitter, 0 clause is the fiber cable, μs) is the receiver SOB) is the column map table, ri is the selector, (g) is the D/A conversion number,
(1) 2 is the optical fiber transmission section, 2 is the CRT display device, +211 is the display control device #''''C.

Claims (2)

[Claims] (1) A CRT display device that displays arbitrary colors on the screen via a display control device, characterized in that an optical fiber transmission section is provided for transmitting digital signals from the display control device to the CRT display device. CR
T display device. (2) On the display control device side, there is a buffer memory that stores data, a parallel/serial converter that converts the data read from this memory to a frequency lower than the original video frequency, and an output from this converter. a transmitter for transmitting the digital signal transmitted through the optical fiber cable; a receiver for receiving the digital signal transmitted through the optical fiber transmission section on the CRT display side; a color map table; 2. The CRT display device according to claim 1, further comprising a selector for selecting the output of the map table, and a D/A converter for converting the digital signal selected by the selector into an analog signal.