JPS63234767A - Method for driving el panel light source - Google Patents

Abstract

PURPOSE:To realize a printing of which quantity of light is increased and to improve the quality of the printing by dividing lighting data to the light-emitting cells of a EL panel into the column number of a zigzag arrangement and lighting the proper light-emitting cell. CONSTITUTION:In the EL panel, the light-emitting cells D1-D13 are divided into the two columns S1 and S2 in the zigzag state at every odd number and even number and provided. By an input data producing circuit 2, the light- emitting cells of the odd number and the even number are divided according to the arrangement of the light-emitting cells and data which emits the divided light-emitting cells of the even number by synchronously delaying t hours with the rotation of a drum 5 according to the rotary direction H of the drum 5. Thus the input data which the light-emitting cells of the even number are inserted between the light-emitting cells of the odd number is produced on a sensitive substance 14. By a driver 3, the light-emitting elements D1-D13 are lighted according to the input data and the printing is executed by irradiating the luminous lights of them in a line on the photosensitive substance 14 through a cell focusing lens 4.

Description

[Detailed Description of the Invention] [Summary] The present invention provides a method for driving thin film electroluminescence (hereinafter referred to as EL) in which light emitting cells are arranged in a staggered manner.
The data string input to the EL panel is divided into a number of columns in a staggered arrangement, and each data is sent to the EL panel with a predetermined delay time.
By sending the light to the panel, the light is exposed in a line on the photosensitive drum of the printer.

[Industrial application field]

The present invention relates to a method for driving an EL panel light source for an electrophotographic printer, and more particularly to a method for driving an EL panel light source in which light emitting cells of the EL panel are arranged in a staggered manner.

In an electrophotographic printer using an EL panel as a light source, it is desired to increase the amount of light from a light emitting cell in order to improve printing quality and printing speed.

[Conventional technology]

A, B, and C in FIG. 8 show schematic diagrams of conventional cell structures.

Figure A shows a general cell structure, in which light emitting cells a are arranged with a predetermined dot interval W. In such a cell structure, since the area of the light emitting cell a is limited by the dot interval W, the amount of light emitted is also limited.

The cell structure shown in FIG. B has a larger cell area in the rotation direction (vertical direction) in order to increase the amount of light of the light emitting cell a in FIG.

Further, FIG. C is an improved cell arrangement of FIG. B, with a staggered cell structure that increases the light emitting area of the light emitting cells while ensuring the same dot spacing W.

, [Problems to be Solved by the Invention] Even in the cell structure shown in FIG. 8B, which is an improvement on the above-mentioned FIG. When an EL panel with the cell structure shown in Figure C is driven to send data sequentially to the panel and display them at the same time as in the past, as shown in Figure 9, the printing becomes staggered and not in a single line. Uneven areas occur, which deteriorates print quality.

The present invention was created with these points in mind, so it prints a staggered array of light emitting cells with increased light intensity in one line.
It is an object of the present invention to provide a method for driving an EL panel light source that can improve printing quality.

[Means for solving problems]

FIG. 1 shows a principle diagram of a method for driving an EL panel light source according to the present invention, in which light-emitting cells are arranged in multiple rows in a staggered manner in an EL panel 10, and lighting data for the light-emitting cells is divided into the number of rows in a staggered arrangement. An input data creation circuit 2 provides each of the divided data with a predetermined delay time synchronized with the rotational speed of the photosensitive drum, and corresponding to the created data, the corresponding light emitting cell of the EL panel 1 is driven to light up. The light emitted from the EL panel 1, which lights up in response to input data, is focused onto the photoreceptor 14 on the drum 5 through the focusing lens 4 and printed. ing.

[Effect]

FIG. 2 shows an example of the cell structure of an EL panel l in which light emitting cells are arranged in multiple rows in a staggered manner, and the light emitting cells D1 to D13 are arranged in a staggered manner for each odd number and even number. It is divided into columns and arranged.

The input data creation circuit 2 generates odd numbered light emitting cells (Dl, D3...Dl3) corresponding to the arrangement of the light emitting cells shown in FIG.
and even-numbered light-emitting cells (D2.4...Dl2), and the even-numbered light-emitting cells (D2.4...Dl2), which are divided corresponding to the rotational direction H of the drum 5, are synchronized with the rotation of the drum. Create data that emits light by delaying Δ. Note that the time Δ is determined from the drum rotational speed V/1 (distance between Sl and 82). This results in input data on the photoreceptor 14 in which even-numbered light-emitting cells are inserted into gaps between odd-numbered light-emitting cells.

The driver 3 turns on the light emitting elements D1 to D13 of the EL panel l in response to the above input data, and directs the emitted light from the light emitting elements to the photoreceptor 6 via the self-focusing lens 4.
Irradiate in a straight line upwards.

〔Example〕

FIG. 3 shows a block diagram of an EL panel driving method according to an embodiment of the present invention, and shows a pattern memory section 6 for storing input data, even number data output from the pattern memory section 6, and odd number data. a delay circuit 8 that delays the even number data divided by the even number and odd number division circuit 7 by a predetermined amount; , parallel/combining the odd data output from the odd division circuit 7.
The input data creation circuit 2 is constituted by the serial conversion circuit 9.

It also includes a shift register 10 for arranging the input data combined by the parallel/serial conversion circuit 9 in a line;
The driver 5 is composed of a launch circuit 11 that launches data arranged in a column and outputs it at the same timing, and a drive circuit 12 that lights up a corresponding light emitting element in response to the output data of the latch circuit 11. .

The operation will be explained with reference to the cell structure diagram of the panel in FIG. 5, the data diagram in FIG. 6, and the light emission state of the panel at each timing and an example of printing on the photoreceptor in FIG. 7.

FIG. 5 shows a cell structure diagram of a panel of one embodiment,
Odd-numbered cells and even-numbered cells are arranged in two rows in a staggered manner as shown in the figure, and the spacing between them is a dot pinch! It is.

The pattern memory 6 sequentially stores information on printing patterns, as shown in FIG. 7A. The data output from the pattern memory 6 is divided into odd and even numbers by an odd/even dividing circuit 7 as shown in Figure B. The odd numbers are sent to a parallel/serial conversion circuit 9, and the even numbers are sent to a delay circuit 8.
is output to.

The delay circuit 8 inputs the even number Δ as time = drum rotation speed v/z (interval between Sl and S3 and S4 and 36)
The signal is delayed and output to the parallel/serial conversion circuit 9.

The parallel/serial conversion circuit 9 combines the data in FIG. 6B in the order of input, and as shown in FIG.
Arrange at the timing of For example, at timing t2, data 7, 2, 9, 4, and 11.6 are combined by the parallel/serial converter 9, arranged in a line by the shift register 1O, latched by the latch circuit 11, and then at the same timing. is inputted to the drive circuit 12.

The drive circuit 12 causes the cell to emit light or not to emit light in accordance with the input number data. The light emitting state at that timing is shown in FIG. 7A, and an example of printing is shown in FIG. 7B. Since the spacing between the two cell rows is a dot pinch, in the print row, the even numbered data emitted at t2 is printed between the odd numbered data printed at tl, resulting in high quality data with no unevenness. Perform printing.

Similarly, after t3, the printed example can be made uneven.

FIG. 4 shows a block diagram of an EL panel driving method according to another embodiment of the present invention, in which a parallel/serial conversion circuit 9 is installed between the pattern memory 6 and the odd/even division circuit 7.
Furthermore, a coupling circuit 13 is provided which couples the odd number data output from the even/odd division circuit 7 and the even delay data output from the delay circuit 8, and outputs the output of the coupling circuit 13 to the shift register 10 shown in FIG. It is configured to do this.

The operation is as follows: First, the output data of the pattern memory 6 is converted into parallel/serial data, and then divided into even numbers and odd numbers by the even/odd number division circuit 7, and the divided odd number data is delayed by the delay circuit 8. The even-numbered data thus obtained are combined again in the combining circuit 13 to obtain the data array shown in FIG. 6C.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to print in one line using a staggered array of EL panel light sources with amplified light intensity, which has the effect of improving the printing quality of the printer.

[Brief explanation of the drawing]

FIG. 1 is a principle diagram of an EL panel driving method according to the present invention, FIG. 2 is an example diagram of a light emitting cell structure of an EL panel, and FIG. 3 is a block diagram of an EL panel driving method according to an embodiment of the present invention. Fig. 4 is a block diagram of an EL panel driving method according to another embodiment of the present invention, Fig. 5 is a cell structure diagram of one embodiment, Fig. 6 is a data diagram of one embodiment, and Fig. 7 is one implementation. FIG. 8 is a schematic diagram of a conventional cell structure, and FIG. 9 is a schematic diagram of printing of a conventional staggered arrangement of light emitting cells. In the figure, I is an EL panel, 2 is an input data creation circuit, 3 is a driver, 4 is a self-focusing lens, and 5
is a drum, 6 is a pattern memory, 7 is an even/odd division circuit, 8 is a delay circuit, 9 is a parallel/serial conversion circuit,
10 is a shift register, 11 is a launch circuit, 12 is a drive circuit, 13 is a coupling circuit, and 14 is a photoreceptor. 4 A story about a story n F・D, 770 Figure 3 Ichishota resistance example brown t + l / J plaster rainbow G E= >7- x, q no 5oJ
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Claims (1)

[Claims] An EL panel (
In the electronic printer device of 1) that lights up the light emitting cells to print on the photoreceptor (14) on the photosensitive drum (5), the lighting data for the light emitting cells is divided into a number of columns in a staggered arrangement, and A method for driving an EL panel light source, characterized in that lighting control of the light emitting cells is performed by giving each divided data a predetermined delay time synchronized with the rotational speed of the photosensitive drum.