JPS60205587A - Discharge display panel driving system - 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 The present invention relates to a driving method for an external electrode type discharge display panel, so-called a plasma display panel.

This plasma display panel (FDP)
It is abbreviated as ), a plurality of generally transparent column electrode groups parallel to each other and a plurality of mutually parallel generally opaque row electrode groups are arranged in a matrix shape, and an ionizable gas is interposed between the two electrode groups. Let me! A method is generally known in which the intersections of three selected row electrodes and selected column electrodes are displayed by discharging and emitting light.

In the above-mentioned FDP, by controlling electrode selection of the row electrode group and the column electrode group in accordance with the input signal, an optical image corresponding to the input signal can be displayed.

For example, one electrode group 1 of the row electrode group or the column electrode group, for example, each electrode of the row electrode group, is sequentially and time-divisionally selectively scanned, and the other electrode group 11, for example, the column electrode group, is scanned in synchronization with the scanning. By controlling the selection based on the input signal while maintaining the above, an optical image corresponding to the input signal can be displayed on the FDP surface. In an external electrode type FDP, it is necessary to drive with an alternating current voltage, and the drive signal applied to the row electrode group and the column/electrode group includes a high A-wave pulse called a toggle pulse.

Fig. 1 shows a conventional example, in which a 5x7 character font, a 5x1 underline cursor, and a 32
It is constructed so that eight rows of digits can be displayed.

The signal generated from the 4MHz crystal oscillator (0, S, C) 7 is counted by the read counter (R, C) 6.
It generates an address signal a for readout of 8 bits and 8 bits and an address signal for a character generator (C, a) 9, and also generates data and a black signal Cf for scanning PDP row electrodes.

Input to shift register (S, R) 4. The shift register (S, R) 4 has 8 rows and 8 lines = 64 parallel signal output terminals, each of which is connected to 64 row electrode drivers (R, D) 2, and its output is Connected to the row electrode of PDPI. Therefore shift register (8,1)
The signal input to 4 is input to P by the row electrode driver (R, 1) 2.
It is converted into a voltage sufficient to drive the DPI and input to the PDPI, and the 64 rows 'tJt poles of 8 rows of the PDPI are
Scanning is performed sequentially and time-divisionally at a period of 0 μs. Therefore, one screen is displayed at a cycle of approximately 12.5rn8 (80Hz). In addition, data d consisting of 7 bits and 7 bits for displaying an optical image corresponding to the above-mentioned scanning in p:op 1 is passed through the control circuit 11.
t rel. The save address in RAM 10 is designated by a cursor counter (C, C) 14 that designates the cursor position and an 8-bit address e. i<AMiof
The data written in cw is read out by the read address signal arc, converted into a character signal by the character generator (C, G) 9, and then sent to the shift register (8,
R) Input to 5. Shift register (S, R) 5 is 32
It has digits x 5 = 160 parallel signal output terminals, each of which is connected to a column electrode driver (C, L)) a, whose output is connected to a PDPIO column electrode. Therefore, the data signal sent to the shift register (8, R) 5 is converted into a voltage sufficient to drive the PDPI by the column electrode driver (C, D) 3 and input to the PDPI, and the scanning of the poles is applied to each row'. Prints 160 data signals for 32 digits at the right timing.
Add. On the other hand, on the display screen of a PDP display device consisting of 8 lines of 32 digits, an underline cursor indicating the position where data will be written next is an address signal a for reading.
It is turned on by inputting the output signal of the comparator (q12) to the cursor display control circuit 8, which is generated when the logic of the write address signal e and the write address signal e match. The drive signal applied to the row electrode group and the column electrode group is the toggle signal φ(
250 KHz) to the toggle driver 115 to obtain toggle pulses Tφ, Tφ. Therefore, since the underline cursor is also toggled by 250KHz high-frequency toggle pulses Tφ and T-, like the character display, its display brightness is also the same as the other character display brightness, and when many characters are displayed, The problem was that it was difficult to distinguish the position of the underline cursor.

The present invention eliminates these drawbacks, and the number of discharges during the cursor display period (frequency 'l'- of the high frequency toggle pulse,
The present invention provides a driving method for a discharge display panel, characterized in that the brightness of the cursor display is made brighter than the brightness of the character display by increasing the cursor display.

FIG. 2 is a diagram showing an embodiment of the PDP driving method according to the present invention, which drives a PDPI having a display capacity of 32 columns and 8 lines as shown in FIG. FIG. 2 is a diagram of a toggle pulse generating section of the device. The row electrode group of PDP 1 is 4 as shown in FIG.
MHz crystal oscillator (o, s, c)? , read counter (R, 8) 6, shift register (8, R) 4.
The signals generated by the circuit composed of the row electrode drivers (R, D) 2 are scanned in a time-division manner sequentially at a period of about 200 μs.

In addition, data for displaying an optical image corresponding to the above-mentioned scanning is also sent to the control circuit (C) 11 random circuit shown in FIG.
Access memory (RAM) 10, character generator (C, G) 9. Read counter 1. c)6.
An address switching circuit (A, 8) 13 that switches the address signal between writing and reading, and a shift register (
S, , R) 5% and digit electrode drivers (C, D) 3 are configured, and 160 data signals for 32 digits are applied to the circuit at the timing of scanning each row electrode of J) PDPI. The underline cursor is an address mark for reading.
Comparator (output signal of Q12 (ゝ1L
The cursor is turned on by inputting the "level" to the cursor display control circuit 8.The output signal of the comparator 12 is also connected to the toggle signal switching section 16 as shown in FIG.
φ' can be selected at %1 W level at L" level. φ is the normal toggle frequency (250 KHz), and φ' is supplied with a signal of 500 KHz' or higher frequency than 250 KHz. φ or φI is a toggle pulse T-,' with a peak of approximately 150 cm by the toggle pulse generator 15.
l'*tT-'.

It is converted into T-' and applied to the row electrode driver and column electrode driver.

Figure 3 shows the toggle pulses Tφ (Tφ') and Tφ (Tφ) applied to the row electrode driver and column driver when an underline cursor is displayed at an arbitrary digit in the first row. The toggle pulse of the underline display period of the 18th line, that is, the digit of the monster bird in the 1st line, is synchronized with T:
'or tiT*', synchronization T of the toggle pulse in other rows, that is, the normal character display period; or Tφ
Unlike, the display brightness of the underline cursor is also brighter than the display brightness of other characters.

In other words, the toggle pulse frequency during the period during which the underline cursor is lit is a character such as a number, letter, or symbol.
The display brightness of the underline cursor is bright because the toggle pass frequency during the display period is higher than F with good display quality.
A DP display device is obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional embodiment. FIG. 2 and FIG. 3 are diagrams showing the configuration and waveforms of the toggle pulse generator in one practice of the present invention. 1...PDP, 2...Row electrode driver & 3...Digit IE pole driver, 4. Death...
...Shift register, 6...Readout counter, 7...Crystal oscillator. 8...Cursor guard control circuit, 9...
Character generator, 10...Random-
Access-Memory, 11...Control lE
'lK, 12... Comparator, 13...
... Address switching circuit, 14 ... Cursor counter, 15 ... Toggle pulse generation section, 16.
...Toggle signal switching section. Porridge 1 old

Claims (1)

[Claims] A discharge display panel in which a column electrode group and a row electrode group are provided so as to face each other at a predetermined interval and substantially perpendicular to each other, and a space surrounded by the predetermined interval is filled with an ionizable gas. A discharge in which one electrode group of the column electrode groups is sequentially scanned in a time-division manner, and the other electrode group is selectively controlled by an input signal corresponding to the scanning to display a character and a cursor for specifying the display position at an arbitrary position. Driving a discharge display board, characterized in that, in the display board driving method, the 4 degree of the cursor display is made brighter than the w1 degree of the character display by increasing the number of discharges during the cursor display period. method.