JPH0451217A - Liquid crystal scanning system - Google Patents

Abstract

PURPOSE:To allow interlace scanning and simultaneously a scanning system on two lines by constituting a Y driving means in such a manner that this means can program the 'high' of the scanning signal, i.e. the output thereof by perpendicular data and perpendicular clock. CONSTITUTION:The programmable Y driving means 8 takes in the perpendicular data 6 sent in synchronization with the perpendicular clock 7 by 4 bits each at the fall of the perpendicular clock 7 and takes in the data for 400 lines and thereafter, the driving means outputs the data to scanning signals Y1 to Y400 at the fall of the horizontal clock 4. The scanning sequence and the number of the lines to attain the 'high' among the scanning signals Y1 to Y400 in one horizontal period are freely set in this way.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an information processing device using a liquid crystal display, and in particular to a liquid crystal scanning method suitable for work stages and word processors that display high-definition displays. Regarding.

[Conventional technology]

The scanning method of a liquid crystal display device is described in Hitachi, Data Book, Hitachi, LCS Day Controller/De54 Bar LSA 4 (1988), No. 453, p. 449, (
DATA BOOK HltaahiL CD C
ont, roller / Driver L S
I S IIP.

198a pp, 455-449) K description O! 5K,
Input the data indicating the first line horizontally using p-tsk, -
The system showed the display of the first line, and then shifted the display to the second and third lines according to the horizontal clock. Hereinafter, a conventional liquid crystal display device and its scanning method will be explained in detail using FIGS. 2 and 3.

FIG. 2 is a block diagram of the configuration of a conventional liquid crystal display device, in which 1 is a liquid crystal display device that displays 640 x 400 dots, 2 is display data, 5 is a data latch clock synchronized with the display data, 4 is a horizontal clock, Reference numeral 5 denotes an X driving means, and the X driving means 5 takes in display data 2 for one horizontal line at the falling edge of the data latch clock 5, and then outputs it all at once at the falling edge of the horizontal lock 4. do. It
~X64Q is the output of the X driving means 5 and is panel data. 9 is the liquid crystal panel, 10 is the first line signal, 11 is Y
Drive means, Y1~! 400 is! The output of the driving means is a scanning signal. The X driving means 11 takes in the first line signal 10 at the falling edge of the horizontal clock 4, adds 1 high to the scanning signal Y1, and adds 1 high to the scanning signal Y1 at the subsequent falling edge of the horizontal clock 40.
From scanning signal Y1, scanning signal Y2, scanning signal Y
5 and shift. Figure 3 shows the liquid crystal display device 1 shown in Figure 2.
2 is a timing diagram showing the operation of FIG.

In FIG. 2, the X drive means 5 is 1 as shown in FIG.
Display data 2 is taken in sequentially at the falling edge of data latch clock 2, and the data is read at the subsequent falling edge of horizontal clock 4.
,b data into panel data x1~X64011C
Output. That is, display data 2 and panel data x1
.about.x640 is shifted by one horizontal period, and display data of 640 dots is output from panel data x1 to x640 for one horizontal period. As shown in FIG. 5, the leading line signal 10 is inputted so as to go into a "high" state at the falling edge of the horizontal clock 40 when the X driving means 5 outputs data on the -th line as panel data x1 to x640. Ru. Therefore, the X driving means 11 converts the scanning signal Y1 into panel data x1.
~x640 is set to 1 high state during the horizontal period when it is outputting data on the -th line, and other scanning signals Y2 to Y40
By changing 0 to 10-'' state, the panel data x1 to outputs the data of the second and third lines to the panel data x1 to x640, and the X driving means 11 shifts the data of the second and third lines to the LCD panel 9 by shifting the 1" to the scanning signals Y2 and Y3. By repeating the display, the LCD device 1 displays one screen of 640 x 40 pixels.
It was displaying 0 dots.

[Problem to be solved by the invention]

The above-mentioned prior art does not take into account the interlaced scanning display in which the display is scanned every even line or odd line, or the display of the panel data x1 to x6400 output from the X driving means 5 simultaneously or on two lines.

An object of the present invention is to realize interlaced scanning and a scanning method of a display section on two lines at the same time.

[Means to solve the problem]

In order to achieve the above object, the present invention makes it possible to program the "high" level of the scanning signal which is the output of the Y driving means according to the vertical data and the vertical clock.

[Effect]

! The driving means operates to input vertical data Mkl for the number of scanning lines using the vertical clock, and then output it as a scanning signal to the liquid crystal panel using the subsequent horizontal clock.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1, 4 to aI6.
This will be explained using figures.

FIG. 1 is a block diagram of an embodiment of a liquid crystal display device to which the present invention is applied, which displays 640 x 400 dots, 6 is 4-pin Off direct data, 7 is vertical α-tick, and 6 is programmable Y drive means. The programmable Y driving means 8 takes in superimposed data 6 in the -horizontal period and data for 400 lines in the vertical clock 7, and outputs them as scanning signals Y1 to Y400 at the falling edge of the horizontal clock 4. Others, 1-5, 9. X1-X640. ! 1 to Y400 are the same as in FIG. Figure 4 is programmable than Figure 1! Timing chart explaining the operation of the driving means 60), [
Figure 5 shows the liquid crystal that realizes the programmable Y drive means 8! In the block diagram of the driver, 19 is a 160-output OT crystal Y driver, 12 is enable in, 20 is a latch selector, 81 to B40 are the outputs of the latch selector 20 and select signals, and the enable in 12010-1 state is set to vertical clock 7. (startup), latch selector 2 (l take) included, sl
is set to 1 high 1, and then 'high' is shifted sequentially to 82, . . . 340 at the rise or edge of ill [clock 7.
When the enable in is low 1 at the subsequent rise of the vertical clock 7, the select signal S1 is set to 1 high. , when the latch selector 20 sets the select signal $40 to 1 high, it becomes 10-" when the vertical clock O rises and then O falls, and when the horizontal clock 40 falls), it becomes "I".
・It is a signal that becomes "A". 21 is a latch circuit A, which inputs the 1 high 1 state of select signals 31 to 840 to a 4-bit block of vertical data 6 (four pips of vertical data 6). A latch circuit B 22 latches the output of the latch circuit 21 at a falling edge of the horizontal clock 4.

16 is a selection voltage, 17 is a non-selection voltage, and 15 is a liquid crystal drive circuit, which selects and outputs the selection voltage 16 and the non-selection voltage 17 according to the data output from the latch circuit B 220. In this embodiment, the selection voltage 16 is set to @-I, and the non-selection voltage 17 is set to 1.
This will be explained as 0-1.

Figure 6 is Figure 4: LCD with 0160 output! This is an example of a 400-line liquid crystal display device using a driver 19.

The liquid crystal display device 1 shown in FIG. 1 is programmable! As shown in FIG. 4, the driving means 8 takes in the vertical data 6 sent four bits at a time in synchronization with the vertical clock 7 at the falling edge of the vertical clock 7, and takes data for 400 lines. scan signal Y1 at the falling edge of horizontal clock 4).
- Output to Y400. That is, for example, Vc is set so that only the first line is in the 1 high 10 state as the first horizontal data.
When the fl direct data 6 is input and the vertical data 6 is input so that both the third and fourth lines are 1 high and 1 as the second horizontal data, as shown in FIG.
During the Mizuko period, the scanning signal Y1 becomes @I・I”, at that time,
Panel data x1 to x640 outputted by the X driving means 5 are displayed on the =th line of the liquid crystal panel 9, and in the second water period, the scanning signals X5. When X4 is 1 high, the panel data x1 to The data 6 and the vertical clock 7 are used to input the scanning signals Y1 to Y40 into the X driving means 8 in the scanning order.
It becomes possible to freely set the number of lines in which 1 out of 0 is "high".Next, one embodiment of the programmable drive means 8 will be described using FIGS. 5 and 6.

In FIG. 5, the liquid crystal Y driver 19 can be realized by, for example, a Hitachi liquid crystal driver HD46107, and the latch selector 19 sets the enable input 12 at 10-'' at the rising edge of the vertical clock 7, and sets the select signal S1 to 1 high. 1. As a result, the 4-pin O1l direct data 6 inputted in synchronization with the rise of the vertical clock 70 is transferred to the latch circuit 21 (
Z) Input 17& to the first block (1 to 4 of latch circuit 21 in the figure) at the falling edge of vertical clock 7, and then sequentially -
At the rising edge of direct clock 7, select signal S2...840
and 1 high", and the vertical data 6 is sequentially sent to the latch circuit 2.
1, the latch selector 20 receives the select signal S
40 is set to 1 high", and the enable act 14 is set to 10-" at the subsequent fall of the vertical clock 7, that is,
When 160 bits of data are input, if enable out 14 is set to 10-1, then the result is as follows. The data entered into the latch circuit 21 by IR is taken into the latch circuit 822 at the falling edge of the horizontal clock 4, and its output is 1 high, 10
According to the data contents of ``-'', for ``high'', the liquid crystal drive circuit 15 sets the selection voltage 16 to ``1 high'', and for ``low''.
is converted into a 10-'' non-selection voltage 17 by the liquid crystal drive circuit 15 and output as a scanning signal for 160 lines. FIG. This is an example of connection to the liquid crystal panel 9, which can be realized using three liquid crystal Y drivers 19.Since the enable in 12 of the liquid crystal Y driver 191 is always connected to 10-'', the internal latch is activated by the horizontal clock 4. When the selector 20 is cleared to 1 and %vertical data 6 is sequentially fetched and 160 bits are fetched, the enable out 14 is set to 10-1.
2 starts operating from the next vertical clock 7, takes in vertical data 6, takes 160 bits from the 161st line to the 320th line), and when data from the 520th line is taken in, the enable act 142 is set to 10-. Set it to 1,
The liquid crystal Y driver 193 starts operating and takes in vertical data 6, and takes in the data from the 321st line to the fourth line.After that, when the horizontal clock is input, the falling edge of the horizontal clock causes a fatal crash at the 400th line. scanning signal Y1~
In addition to outputting to Y400, each liquid crystal Y driver 191,
The latch selectors 20 of 192 and 195 are cleared and the enable is set to 141. 142 is set to "1 high", it becomes possible to input data for the next scanning period.

〔Effect of the invention〕

In the present invention, since the line of the selected voltage state of the scanning signal outputted by the X driving means can be freely set, interlaced scanning in which even-numbered lines and odd-numbered lines are scanned can be realized. Furthermore, the number of lines that are simultaneously brought into the selected voltage state during the horizontal period can be set to a plurality of lines.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the OX crystal display device of the present invention, FIG. 2 is a block diagram of a conventional liquid crystal display device, and FIG. 3 is a timing chart showing the operation of the liquid crystal display device shown in FIG. 4 diagrams are programmable for 1141 diagrams! Timing chart showing the operation of the driving means, Figure 5 is programmable! A block diagram of a liquid crystal Y driver as an embodiment of the driving means,
Figure 6 is the liquid crystal shown in Figure 5! FIG. 2 is a block diagram of a 400-line liquid crystal display device using a driver. 1...Liquid crystal display device, 2...Display data, 3...
Data latch clock, 4...Horizontal clock, 5...
・X driving means, 6... Vertical data, 7... Vertical clock, 6... Programmable! Driving means, 9...Liquid crystal panel, XI to X640-...Panel day/, Yl
~N400~ Scanning signal, 10-... Leading line signal, 11... , 17... non-selection voltage, 19
...Liquid crystal Y driver, 20...Latch selector, 2
1...Latch circuit A122...Latch circuit wtB. Figure 10

Claims (1)

[Scope of Claims] 1. An X driving means that takes in display data from a liquid crystal panel and outputs one horizontal portion of display data to the liquid crystal panel, and displays the display data output from the X driving means on the liquid crystal panel. 1. A liquid crystal display device comprising Y driving means for instructing a line to be scanned, characterized in that the operation of said Y driving means is programmable. 2. The liquid crystal scanning method according to claim 1, in which writing is performed using integer bit data and a clock.