KR100851637B1 - Apparatus and method for output of linear curve in digital to analog converter - Google Patents

Abstract

The present invention relates to a digital-analog converter, comprising: a linear resistor in which resistors having the same value are arranged in series to output a linear waveform; A linear switch connected to each of the resistors in the linear resistor and outputting a linear waveform with switching for each resistor; And a decoder which receives a linear waveform output from the linear switch, decodes the decoded linear waveform, and outputs the decoded waveform to an SOM device.

Digital-to-Analog Converters, Linear Curves, Arccosine Curves, SOMs, Decoders

Description

Apparatus and method for output of linear curve in digital to analog converter

1 is a block diagram of a system for HDTV using a conventional SOM driver and SOM device.

FIG. 2 is a conceptual diagram of an input data sequence input to the SOM element in FIG. 1. FIG.

3 is a conceptual view illustrating a scanning direction by the SOM device in FIG. 1.

Figure 4 is a block diagram of an arc cosine curve output device of a conventional digital-to-analog converter.

5 is a detailed circuit diagram of FIG.

6 is a waveform diagram of an arc cosine curve output by FIGS. 4 and 5.

7 is a block diagram of a linear curve output device of a digital-to-analog converter according to an embodiment of the present invention.

8 is a block diagram of a linear curve output device of a digital-to-analog converter according to another embodiment of the present invention.

9 is a detailed circuit diagram of the linear resistor and the linear switch in FIGS. 7 and 8;

FIG. 10 is a detailed circuit diagram illustrating a relationship between an arc cosine resistor, an arc cosine switch, a linear resistor, and a linear switch in FIG. 8.

11 is a waveform diagram of a linear curve output by FIGS. 7 and 8.

12 is a flowchart illustrating a linear curve output method of a digital-to-analog converter according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110: arc cosine resistance 120: arc cosine switch

130: linear resistance 140: linear switch

150: control unit 160: multiplexer

170: decoder

The present invention relates to a digital-to-analog converter (DAC), and more particularly, to output a linear curve when driving a spatial optical modulator (SOM) device, and thus, an optimal SOM device in a short time during device development. The present invention relates to a linear-curve output device and method of a digital-to-analog converter capable of finding operating characteristics, thereby reducing device development time and cost.

In general, SOM devices are used for high definition television (HDTV), such as plasma display panels (PDPs) or liquid crystal displays (LCDs). This SOM device is a device for outputting HDTV-quality video, which has 1080 micro mirror cells arranged in a line to scan and display in the horizontal direction, so the SOM device is composed of 9120 X 1080 pixels. In order to scan an image of one frame, 1080 longitudinally arranged data are required.

Figure 1 is a block diagram of a system for HDTV using a conventional SOM driver and SOM device.

As shown in FIG. 1, an SOM element 20 used for image scanning of a general-purpose HDTV; A SOM driver 10 for driving the SOM device; To correct the characteristics of the SOM device 20, a flash memory 40 having a reference table stored therein, a memory 50 for storing image data, and a galvanometer mirror scanner for spraying an image on a screen. scanner 60, converts an array of rows and columns of image data, transfers the image to the SOM driver 10, controls the galvanometer mirror scanner 60, the flash memory 40 and the memory. SOM controller 30 is connected to the 40;

FIG. 2 is a conceptual diagram of an input data sequence input to the SOM device in FIG. 1.

Thus, the input data sequence used for application in a typical HDTV or the like is horizontally aligned.

3 is a conceptual diagram illustrating a scanning direction by the SOM device in FIG. 1.

Thus, the SOM device 20 is arranged to have 1080 micromirror devices in the longitudinal direction, so that the 1080 pieces of image data input as shown in FIG. 2 are processed to be displayed while scanning in the transverse direction.

The scanning method of HDTV is divided into three panel method and one panel method according to the number of electron guns. The three-panel method uses three SOM drivers 10 for each color of RGB (Red Green Blue) and three SOM elements 20, one for each of the SOM drivers 10. In contrast, the one-panel method uses one SOM driver 10 and one SOM element 20.

4 is a block diagram of the arc cosine curve output device of the conventional digital-to-analog converter, showing the configuration of the conventional SOM driver 10, and FIG. 5 is a detailed circuit diagram of FIG.

4 and 5, an arc cosine resistor 11 in which resistors having different values are arranged in series to output an arc cosine waveform; An arc cosine switch (12) connected to respective resistors in the arc cosine resistor (11) and outputting an arc cosine waveform by switching on each resistor; And a decoder 13 for receiving an arc cosine waveform output from the arc cosine switch 12 and decoding the arc cosine waveform to be output to the SOM device 20.

Thus, the arc cosine resistor 11 is composed of 30, 30, 20, 20, 10, ..., 10, 20, 20, 30, 30 ohm resistors as shown in FIG. Gm <1> is connected to a high voltage and Gm <2> is connected to a low voltage.

In addition, the arc cosine switch 12 is S / W ₂₅₆ , S / W ₂₅₅ , which is connected between the resistance of 30, 30, 20, 20, 10, ..., 10, 20, 20, 30, 30 ohms respectively It consists of S / W ₂₅₄ , S / W ₂₅₃ , ..., S / W ₄ , S / W ₃ , S / W ₂ , and S / W ₁ .

6 is a waveform diagram of an arc cosine curve output by FIGS. 4 and 5.

Therefore, in order to output the waveform of an arc cosine curve as shown in FIG. 6, the resistance train by the arc cosine resistor 11 and the arc cosine switch 12 as shown in FIG. 5 is used. In this case, only the arc cosine curve is satisfied.

A more detailed description of such a conventional driving operation is as follows.

First, only the arc cosine resistor 11 that is a resistor string corresponding to a desired voltage is arranged.

And the arc cosine switch 12 is attached to each end of the resistance string.

Then, the decoder 13 is attached to the next stage to select and drive the desired voltage.

However, this conventional method has a limitation in that voltages other than arc cosine cannot be output.

In the case of the current SOM device, since the mass production is not applied, it is impossible to determine that the device characteristics fit the curve. If you want to output a linear curve to find the optimal SOM device characteristics, you have to redesign, which increases the design time and cost.

The present invention has been made to solve the above problems, an object of the present invention, by outputting a linear curve when driving the SOM device to find the optimal SOM device operating characteristics within a short time during device development time and cost of device development To provide a linear curve output device and a method of the digital-to-analog converter can be reduced.

A linear curve output device of a digital-analog converter according to the present invention for achieving the above object comprises: a linear resistor in which resistors having the same value are arranged in series to output a linear waveform; A linear switch connected to each of the resistors in the linear resistor and outputting a linear waveform with switching for each resistor; And a decoder that receives the linear waveform output from the linear switch, decodes the output, and outputs the decoded linear waveform to the SOM device.

The linear curve output device of the digital-to-analog converter comprises: an arc cosine resistor in which resistors having different values are arranged in series to output an arc cosine waveform; An arc cosine switch connected to respective resistors in the arc cosine resistor and outputting an arc cosine waveform with switching for each resistor; A controller for controlling waveform selection in the multiplexer; And a multiplexer under the control of the controller, the output of the arc cosine switch and the liner switch to select one waveform and output the selected waveform to the decoder. It is characterized by receiving an arc cosine waveform or a linear waveform and decoding it and outputting it to the SOM device.

The linear curve output method of the digital-to-analog converter according to the present invention for achieving the above object comprises: a) determining which waveform to output when the SOM driver is operated; b) if it is determined that the output of the arc cosine waveform in step a, the arc cosine resistance connected in series with the resistors having different values are switched by the arc cosine switch to output the waveform of the arc cosine resistance, the output arc Selecting and decoding a waveform of the cosine resistor; And c) if it is determined that the linear waveform is output in step a, a linear resistor having a series of resistors having the same value is switched by a linear switch to output a waveform of the linear resistor, and the waveform of the output linear resistor is determined. Selecting and decoding; characterized by performing.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be.

In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Next, a linear curve output device and method of a digital-to-analog converter according to the present invention will be described in detail with reference to the accompanying drawings.

First, the linear curve output device and method thereof of the digital-to-analog converter according to the present invention outputs a linear curve when driving the SOM device so that an optimum SOM device operating characteristic can be found within a short time during device development, thereby improving device development time and It is to reduce the cost.

7 is a block diagram of a linear curve output device of a digital-to-analog converter according to an embodiment of the present invention.

As shown in Fig. 7, a linear resistor 130 in which resistors having the same value are arranged in series to output a linear waveform; A linear switch (140) connected to the respective resistors in the linear resistor (130) to output a linear waveform by switching for each resistor; And a decoder 170 that receives the linear waveform output from the linear switch 140 and decodes it and outputs the linear waveform to the SOM device.

FIG. 9 is a detailed circuit diagram of the linear resistor and the linear switch in FIGS. 7 and 8.

Thus, the linear resistor 130 is composed of 10, 10, 10, 10, 10, ..., 10, 10, 10, 10, 10 ohm resistors as shown in FIG. Gm <1> is connected to a high voltage and Gm <2> is connected to a low voltage.

In addition, the arc cosine switch 140 is S / W ₂₅₆ , S / W ₂₅₅ , which is connected between the resistance of 30, 30, 20, 20, 10, ..., 10, 20, 20, 30, 30 ohm, respectively It consists of S / W ₂₅₄ , S / W ₂₅₃ , ..., S / W ₄ , S / W ₃ , S / W ₂ , and S / W ₁ .

FIG. 11 is a waveform diagram of a linear curve output by FIGS. 7 and 8.

Therefore, in order to output the waveform of the linear curve as shown in FIG. 11, the resistor strings of the linear resistor 130 and the linear switch 140 as shown in FIG. 9 are used. In this case, the waveform of the linear curve can be output to find the optimal SOM device operating characteristics.

8 is a block diagram of a linear curve output device of a digital-to-analog converter according to another embodiment of the present invention.

As shown in Fig. 8, an arc cosine resistor 110 in which resistors having different values are arranged in series to output an arc cosine waveform; An arc cosine switch (120) connected to respective resistors in the arc cosine resistor (110) and outputting an arc cosine waveform with switching on each resistor; A linear resistor 130 in which resistors having the same value are arranged in series to output the linear waveform; A linear switch (140) connected to the respective resistors in the linear resistor (130) to output a linear waveform by switching for each resistor; A controller 150 for controlling waveform selection in the multiplexer 160; And a multiplexer 160 which is controlled by the controller 150 and receives the outputs of the arc cosine switch 120 and the linear switch 140, selects one waveform, and outputs one waveform to the decoder 170. And a decoder 170 that receives an arc cosine waveform or a linear waveform output from the multiplexer 160 and decodes the decoded output to the SOM device.

Therefore, the multiplexer 160 receives the output of the arc cosine switch 120 and the linear switch 140 and multiplexes it. In addition, under the control of the controller 150, one waveform from among the arc cosine waveform and the linear waveform is selected and outputted to the decoder 170.

This allows the use of arccosine curves or linear curves as needed.

FIG. 10 is a detailed circuit diagram illustrating a relationship between an arc cosine resistor, an arc cosine switch, a linear resistor, and a linear switch in FIG. 8.

Therefore, the linear resistor 130 may be implemented by only a simple change to the arc cosine resistor 110.

In the case of the current SOM device, it is not possible to determine that the device characteristics are suitable for the curve because it is not mass-produced, but developing a SOM driver for that time causes a problem in time and expense. Therefore, as in the present invention, if the linear output is also possible while maintaining the resistive heat of the arc cosine, it is possible to perform the test in various combinations of the SOM devices so that they can be easily used to find the optimal operating characteristics of the SOM devices. do.

12 is a flowchart illustrating a linear curve output method of a digital-to-analog converter according to an embodiment of the present invention.

First, when the SOM driver is operated (S201), it is determined which waveform to output (S202).

Therefore, if it is determined that the output of the arc cosine waveform, the waveform of the arc cosine resistance switched by the arc cosine switch 120 is selected and decoded (S203).

In addition, when it is determined that the linear waveform is output, the waveform of the linear resistor switched by the linear switch 140 is selected and decoded (S204).

Accordingly, the linear curve output device and method thereof of the digital-to-analog converter according to the present invention outputs a linear curve when driving the SOM device so that an optimum SOM device operating characteristic can be found within a short time during device development, thereby improving device development time and This has the advantage of reducing costs.

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration and various substitutions, modifications within the scope of the technical spirit of the present invention for those skilled in the art to which the present invention pertains. And it will be possible to change, and such substitutions, changes, etc. should be regarded as belonging to the following claims.

As described above, the linear curve output device and the method of the digital-to-analog converter according to the present invention outputs a linear curve when driving the SOM device to find the optimal SOM device operating characteristics in a short time when the device development This can reduce development time and expenses.

Claims (3)

A linear resistor in which resistors having the same value are arranged in series to output a linear waveform; A linear switch connected to each of the resistors in the linear resistor and outputting a linear waveform with switching for each resistor; And A decoder which receives the linear waveform output from the linear switch, decodes the linear waveform, and outputs the decoded waveform to the SOM device; Linear curve output device of a digital-to-analog converter comprising a. The method of claim 1, Linear curve output device of the digital-to-analog converter, An arccosine resistor in which resistors having different values are arranged in series to output an arccosine waveform; An arc cosine switch connected to respective resistors in the arc cosine resistor and outputting an arc cosine waveform with switching for each resistor; A controller for controlling waveform selection in the multiplexer; And A multiplexer which is controlled by the controller, receives the output of the arc cosine switch and the linear switch, selects one waveform, and outputs the selected waveform to the decoder; It is configured to include more And the decoder receives an arc cosine waveform or a linear waveform output from the multiplexer, decodes the decoded waveform, and outputs the decoded waveform to the SOM device. a) determining which waveform to output when the SOM driver is operated; b) if it is determined in step a that the output of the arc cosine waveform, the arc cosine resistance connected in series with the resistors having different values are switched by the arc cosine switch to output the waveform of the arc cosine resistance, the output arc Selecting and decoding a waveform of the cosine resistor; And c) If it is determined that the linear waveform is output in step a, the linear resistors having the same values connected in series are switched by a linear switch to output a waveform of the linear resistance, and the waveform of the output linear resistor is selected. To decode; Linear curve output method of a digital-to-analog converter comprising a.

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