KR0148696B1 - Print circuit for high quality image - Google Patents

Abstract

The present invention compares data between lines to be printed in a color video printer and a printer such as a facsimile that prints using a thermal print head, thereby compensating edges between lines to provide a clearer print screen. About high quality printed circuits

In the thermal transfer printer, two line memories are provided which sequentially write the line data read from the existing line memory.

An adder for adding data read from the two line memories and data read from the existing line memory.

The data adder for controlling the strobe time of the strobe generator by comparing the data added by the adder is provided.

Description

High definition printed circuit

1 is a conventional circuit diagram.

2 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

10: frame memory 20: line memory

30: gradation comparison unit 40: clock generator

50: address generator 60: gradation counter

70: counter part 80: strobe generating part

90: thermal head 100,200: line memory

300,400: Adder 500: Data comparison unit

The present invention compares data between lines to be printed in a color video printer and a printer such as a facsimile that prints using a thermal print head, thereby compensating edges between lines to provide a clearer print screen. It relates to a high quality printed circuit.

Existing devices that provide color clean screens include ink jets, thermal dye dissipation, and laser devices.

Among them, a sublimation thermal transfer printer is a device that provides a high quality print screen at an appropriate price.

Passion machine type printers use heat to transfer ink from an ink sheet to paper or cover film.

Although the thermal transfer method is excellent in the quality of the output color, the voltage drop occurs due to the parasitic resistance inside the thermal transfer head, and due to the voltage drop, the energy applied to the thermal transfer head changes, causing deterioration of image quality. Done.

That is, the conventional sublimation thermal transfer printer has only a function of compensating for deterioration of image quality due to voltage drop inside the thermal transfer head by controlling the strobe time by calculating the number of simultaneous heating dots (DOT) for each gray level. Degradation of image quality could not be avoided by calculating only the number of heating dots for each gray level and printing by adjusting the strobe time for each gray level.

In view of the above, the present invention provides a clearer picture quality by adjusting the strobe time by comparing data between lines and lines, in addition to the function of controlling the strobe time with the number of simultaneous heating dots for each gray level.

The present invention includes two line memories for sequentially writing line data read from an existing line memory in a thermal transfer printer device.

An adder for adding data read from the two line memories and data read from the existing line memory.

And a data comparator for adjusting the strobe time of the strobe generator by comparing the data added by the adder.

As described above, the sublimation thermal transfer printer circuit will be described before describing the present invention in which a clear image quality can be obtained by adjusting the strobe time by comparing data between lines.

1 is a conventional circuit diagram

A circuit for calculating the number of simultaneous heating dots for each gradation of a sublimation thermal transfer printer is shown.

The frame memory 10 stores one frame of one frame of data to be printed, and the line memory 20 receives and stores one line of data stored in the frame memory 20.

The data stored in the line memory 20 is applied to the gradation comparison unit 30, at this time, to the gradation comparison unit 30, and at this time, the gradation comparison unit 30 is applied to the gradation counter 60. Compared with that, binary data for generating heat of the heat generating element of the thermal transfer head 90 is output to the thermal transfer head 90.

Here, the operation of storing and reading the line memory of the line memory unit 20 is controlled by the address data of the address generator 50, and the address generator 50 receives the clock data generated by the clock generator 40 to receive the address data. Will be printed.

The clock data generated by the clock generator 40 is applied to the counter unit 70.

The counter 70 receives the clock data from the clock generator 40 and counts binary data output from the gray level comparator 30.

The counter unit 70 counts the number of simultaneous heating dots for each gray level and applies it to the strobe generator 80.

The strobe generation unit 80 recognizes the dot number calculation output for each gray level of the counter unit 70 to vary the strobe time of the thermal transfer head 90.

This conventional method controls the strobe time by calculating the number of simultaneous heating dots for each gray level, resulting in voltage drop due to parasitic resistance components present in the thermal transfer head, resulting in deterioration of the printed image quality.

In order to solve the above problem, the strobe time is adjusted by using the number of simultaneous heating dots for each gray level, and the strobe time is adjusted by comparing data between one line and the line to obtain a clearer print screen.

2 is a circuit diagram of the present invention.

While the line data stored in the frame memory 10 is stored in the line memory 20, the data stored in the line meromyo 20 is applied to the thermal transfer head 90 as binary data to the gradation comparator 30.

In the sublimation type thermal transfer printer, in which the strobe generation unit 88 adjusts the strobe time of the thermal transfer head 90 to the value obtained by counting binary data of the gradation comparison unit 30 by the counter unit 70.

A line memory 100 for reading and storing line data stored in the line memory 20,

A line memory 200 for reading and storing line data stored in the line memory 100,

Adders 300 and 400 for adding data read from the line memories 20 and 200, respectively;

The data comparator 500 compares the addition data of the adders 300 and 400 and applies the data to the strobe generator 80.

Let's look at this in detail.

The line data transmitted from the frame memory 10 that stores one screen of image data to be printed is transferred to the line memory 20 through the parallel data bus.

The clock generator 40 applies a clock to the address generator 50 that outputs address data, and the data transmitted to the line memory 20 is line memory 20 according to the address value generated by the address generator 50 according to the clock. ).

After reading the data stored in the line memory 20, the gray level comparison unit 30 compares the level with the reference level, and outputs previous data for generating the heating elements of the thermal transfer head 90 to perform gray level printing.

Since this operation is a general operation of a conventional sublimation thermal transfer printer, a detailed description thereof will be omitted.

In the address generator 50 of the present invention, the address is generated as much as one line of data so that one line of data can be stored in the line memory 20.

Then, the stored data can be repeatedly read 255 times (if the input data is 8 bits).

The line memory 100 stores data stored in the line memory 20 when reading the data of the line memory 20.

When data is stored in the line memory 20, the data stored in the line memory 100 is stored in the line memory 200.

Accordingly, data to be printed currently is stored in the line memory 20, and previously printed data is stored in the line memory 200.

In this way, the timing of the line memory 20 and the line memory 200 becomes the same.

The previously printed data stored in the line memory 200 is applied to the adder 300 so that the data obtained by adding the entire data is outputted, and the data to be printed stored in the line memory 20 is applied to the adder 400 and the entire data. The data obtained by adding is output.

The data added by the adders 300 and 400 is input to the data comparator 500 to compare each other's data, and the comparison data of the data comparator 500 is applied to the strobe generator 80 to generate the strobe time. To be variable.

Accordingly, the strobe generator 80 adjusts the strobe time according to the number of heating dots for each gray level generated by the counter 70, while comparing the data applied from the data comparator 500, that is, the data comparator 500 between lines. The strobe time is adjusted according to the comparison data applied from the line, that is, the data comparison between the lines.

As described above, the present invention adjusts the strobe time using the number of heating dots for each gray level, and compares data between one line and the line, and adjusts the strobe time to obtain a clear print screen by compensating for deterioration and edge of image quality.

Claims (1)

The grayscale comparison unit 30 outputs binary data to the thermal transfer head 90 by comparing the line data of the line memory 20 storing the line data of the frame memory 10 with the comparison reference level. In the thermal transfer type printer circuit in which the strobe generation unit 80 adjusts the strobe time of the thermal transfer head 90 in accordance with the output of the counter unit 70 that counts the output of the line unit 30, the line memory 20. A line memory 100 for reading and storing the data stored in the line memory, a line memory 200 for reading and storing the data stored in the line memory 100, and an adder for adding previous printing data stored in the line memory 200 ( 300, the adder 400 for adding the data to be printed stored in the line memory 20 and the addition data of the adders 300 and 400 are compared to the strobe generator 80 as a strobe time adjustment signal. Visible key high-quality printed circuit, characterized in that the connection configuration in which the data comparator 500. The