JPS59146090A - X-y dot matric 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 Field of the Invention This invention relates to an X-Y dot matrix display device.
Especially the multi-split parallel morning drive with a large display screen! ! It-type X-
Concerning Y dot matrix display device.

BACKGROUND OF THE INVENTION There is a line-sequential scanning method in X-Y matrix dynamic drive 1PJJ. This is done by automatically scanning the X electrodes in the X-Y electrode (X-Y matrix screen) 1 in FIG. 1 from the top, that is, from XI to Once each X electrode is selected, each
For each electrode, the Y electrode data on the X electrode, that is, the ON or ON data, is added to the Y electrode IfiY or YM at once to display the screen line by line. FIG. 3 is a timing diagram of signals applied to the X electrode and the Y electrode. The operation shown in FIG. 1 will be briefly explained with reference to FIGS. 1 and 2.

The scanning signal of the X electrode is obtained by inputting the pulse S of the 1/N decorty into a shift register 2 and shifting it with the clock pulse CP1. Then, the wedge circuit 3 reads out the contents of the shift register 2 little by little at the timing of the clock pulse CP2, and applies it to the X electrode.

The display data on each line of the XN poles, that is, the Y electrode data, is obtained by shifting the serial input data DI input to the shift register 4 using the tarlock pulse CP2, and then outputting the data to the latch circuit 5.
By latching with clock pulse CP1 at Y
It can be added to electrodes Y1 to YM all at once.

By the way, the frequencies of these signals rcp+, fOP 2
+ 'S and the repetition frequency tFLM for scanning the X electrodes is frt, M=r −t c p + /N (N: number of X electrodes)=f
The relationship CP27M-N (M: number of Y electrodes) holds true. Here, the repetition frequency fFLn is required to be 3512 or more, which does not cause flickering to the human eye. Now, suppose the size of the display screen is N=64. Assuming the large display screen of M-480, [In order to make L gate ≥ 35, r CP 2 ; Then, generally
For example, in the case of an LCD dot matrix driver, LH5006, HD44
100, etc.) (1) 4tA'lA is i-bar.

Therefore, in the case of such a large screen, it is well known that the frequency can be lowered by dividing the display screen, for example, driving two screens in parallel.

FIG. 3 is a block diagram showing the flow of signals applied to the XY matrix screen 1' when the display screen is divided as described above and driven as two screens in parallel.

Further, FIG. 4 is a timing diagram of signals in the block diagram of FIG. 3. In FIG. 3, as in FIG. 1 described above, the scanning signal @ of the X electrode of the X-Y matrix screen 1' is 1
/N duty pulse S is put into shift register 2,
Obtained by shifting with clock pulse CP1. On the other hand, the display data on each of the X electrodes and the Zunawara Y electric data are divided into serial input data 012, which displays the upper half of the screen, and serial input data 012, which displays the F half of the screen. Each serial input data D11. DI2 is transferred in each shift register 6.8 with a clock pulse CP2 and latched in the latch circuits 7, 9 with a clock pulse CP1.

And each Y? 'ff is added to the pole all at once.

Therefore, if you create a two-split screen like this,
Two pieces of serial input data, DII and DI2, are required. In other words, input data DII and DI2
This means that a separate external circuit is required to supply this. In other words, as shown in FIG.
The drawback was that it required serial conversion.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a multi-divided parallel drive type X-Y dot matrix display device with a large display screen, which allows the circuit to be simplified and miniaturized.

Summary of the Invention Simply put, the present invention is a driver matrix display device that drives an X-Y electrode matrix line-sequentially, comprising:
In devices that divide the display screen into multiple screens,
By placing the data signals for each screen display on a common data bus instead of separate data buses, the X-Y circuit can be simplified by using a common data bus and parallel/serial converter. This is a dot matrix display device.

The above objects and features of the present invention will become clearer from the description of one embodiment with reference to the following drawings.

Embodiment FIG. 6 (This is a block diagram of an embodiment of the present invention.
The features of this embodiment are well illustrated.

That is, a screen in which screen data to be displayed is stored and a parallel 7/' serial converter 18 are connected by a common data bus 17.

The data in the C1 screen data memory 16 is then multiplexed onto the data bus core, and parallel/serial
i converted from parallel to serial by converter 18
Sent to M, f-nrutibrekna 19. In the demultiplexer 19, the serial conversion data is divided into data DI'1 for the upper half screen and data l) I2 for the lower side.

These separated data D11 and DI2+, the third
The signals shown in the figure are sent to the register 6 and the shift register 9, respectively. The subsequent operation is similar to that described in FIG.

As in this embodiment, the data is first taken out from the screen data memory 16h) by the common bus 17, and the data is transferred to parallel//'serial l converters 1B-C.
'By serial conversion, the IJε 3-bit data bus and parallel/serial converter can be shared, and the circuit can be simplified. .

Next, FIG. 7 shows a more specific circuit r8 of the conventional device, and FIG. 8 shows a specific circuit of an embodiment of the present invention, which corresponds to FIG. vinegar.

Further, FIG. 9 shows a timing diagram of signals of the conventional device shown in FIG. 7, and FIG. 10 shows a timing chart of signals of the device of the embodiment of the invention shown in FIG. vinegar.

With reference to FIGS. 8 and 10, the equipment U of this embodiment
The operation of J: will be explained in detail.

4t data D is multiplexed from the screen data memory 16 (FIG. 6) onto the common data bus 17 (FIG. 6).
Ba to 7 are converted into serial data by a parallel/serial converter 18. So, the multiplexed 8 pin 1 ~ signal D B 11%? In the fJ parallel/serial converter 18, bits are selected by the signal aO=Z, and the data is converted into serial data. This signal B converted to serial data is Z'
〔be. Be converted.
I'm scared of the D terminal. These D Noritsubu' 7 r-
The other input terminals of the 1-tubes 22 and 23 are supplied with a L1 pulse C(]2 having a period equal to the switching of the serial conversion data.

11, the clock pulse CP 2 is the inverter 25
is applied directly to the other input terminal of the D2 control flop 22, and the other input terminal of the control flop 233 is directly applied. Therefore, when the signal Z is latched from the flip-flop 22.231 at the falling and rising edges of the [I]J link pulse C1]2, the signals D11' and []I2
14 will be given. Sara (2, this signal 1) l i'
1) - Noritsubufu [21 When the D terminal of the knob 24 is crossed and the clock pulse CP2 is latched at X:l, the number D11 is obtained. Therefore, the data output from the screen data meter (Figure 6) is 11 and 1, respectively.
-half ii! The data can be separated into serial data to be applied to the Y electrodes on the ii side and the lower half screen.

In addition, in the description of each of the above embodiments, in C, the screen is divided into 22 parts, but the screen is not limited to this, but may be divided into 3 parts, 4 parts, or more. The present invention can be applied even when the drive is covered. Even in the case of multi-division parallel drive, it is possible to share the data bus and parallel/serial converter.

Effects of the Invention As described above, according to the present invention, the data signals for each screen display are transferred from the screen data memory to a common bus by transposing the multiple-divided parallel drive type X-Y dot helix display display. Since the data bus and the parallel/serial converter can be used in common, the circuit can be simplified and simplified. Also, this circuit is 1
When integrated and housed in a chip, it also has the effect of reducing the number of terminals in the chip package.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a display section of an X-, Y-driver, L-matrix display device according to the present invention. FIG. 2 is a timing diagram of the signals in the J block diagram shown in FIG. 1. FIG. 3 is a block diagram of a display section of an X-Y dot I hematrix display device using a two-division parallel drive system. FIG. 4 is a timing diagram of the signals in the block diagram shown in FIG. 3. FIG. 5 is a block diagram of a conventional device. 6 is a block diagram of a signal conversion circuit according to an embodiment of the present invention. FIG. 7 is a concrete circuit block diagram of the block diagram shown in FIG. 5. 9 is a more specific circuit block diagram of the block diagram of one embodiment of the present invention shown in FIG. 6. FIG. 9 is a timing chart of signals of the circuit shown in FIG. 7. FIG. These are the timing ports for the signals in the circuit block diagram shown in the figure. In the figure, 1 is the X-Y matrix screen, 2°4 is the jit 1 register, 3.5 is the latch circuit, 1 (3 is the screen data memory, and 17 is the data Bus, 18th floor, Purnrel/'
Serial converter, 19 is Demarbubu 1 Noxa, 22
, 23.24 indicates D Noripno [1 tube].

Claims (1)

[Claims] In a driver 1-axis display device that drives X-Y electrodes 71 helices line-sequentially and that divides the display screen into a plurality of screens, the screen data to be displayed is stored. It comprises a screen delta memory and a second converter for parallel/serial conversion of the screen data in the memory, the screen data memory and the converter are connected by a single bus, and , further comprising a demultiplexer that separates the serial data into the plurality of pieces so that the serial data converted by the converter can be divided and displayed on the plurality of screens. , X-Y dot matrix display device.