KR100629130B1 - Display device and driving circuit, driving unit, and driving method thereof - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a driving circuit, a driving device, and a driving method of a display device which can simplify a wiring pattern or arbitrarily change the displayed gray level for each data.

According to an aspect of the present invention, there is provided a driving circuit of a display device which inputs image data necessary for displaying an image output from a timing controller and outputs an applied voltage to the display device, the gradation voltage generating means being connected to only a ground and a power supply to generate a gray scale voltage; Image data changing means for changing the image data input to the driving circuit into the image data corresponding to the applied voltage, inputting the gradation voltage and the changed image data and selecting the gradation voltage corresponding to the image data to the display device as an applied voltage. A drive circuit for a display device comprising a D / A converter for outputting.

Driving circuit

Description

Display device and its driving circuit, driving device and driving method {DISPLAY DEVICE AND DRIVING CIRCUIT, DRIVING UNIT, AND DRIVING METHOD THEREOF}

1 is a block diagram of a display device of the present invention;

FIG. 2 is an internal block diagram of the column driver in FIG. 1. FIG.

3 is a table showing the gradation characteristics in the present invention.

4 is a block diagram of a display device of the present invention;

5 is a block diagram of a display device of the present invention;

6 is an internal block diagram of the column driver in FIG.

7 is a block diagram of a display device of the present invention;

8 is a block diagram of a display device of the present invention;

9 is a block diagram of a display device of the present invention;

※ Explanation of code for main part of drawing

1: timing controller 2: image data

3: sync signal 4: image data

5: Control signal for column driver 6: Power supply for column driver

7: ground 8: column driver

9: storage means 11: applied voltage

12: control signal for low driver 13: power supply for low driver

14: Low driver 15: Low driver side applied voltage

16 liquid crystal panel 17 resistance

101: D / A converter 102: image data changing means

103: gradation voltage 104: table value

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive circuit, a drive device, and a drive method for use in a display device, and more particularly, to a drive circuit, drive device, and drive method on the column driver side for performing gradation display.

Conventional display apparatuses drive image data, control signals and the like on the display body.

In the drive device for a display device as described above, it is disclosed that all gray scale display can be performed without using a gray scale power source (see Patent Document 1, for example).

[Patent Document 1]

Japanese Patent Application Laid-open No. Hei 7-181925 (pages 5 to 6, Figs. 1 and 2)

According to Patent Literature 1, the gradation power supply required for the gradation number in the display device driving device is replaced with a gradation signal supply unit for supplying a periodic signal having a vibration waveform to display all gradations with one gradation power supply. Therefore, the circuit can be simplified.

특성을 따르도록 결정되어 있어 계조특성을 임의로 변경할 수는 없다. However, in the display device driving apparatus described in Patent Document 1, the relationship between the selected gradation voltage and the corresponding output signal (image data) is

Since it is decided to follow the characteristics, the gradation characteristics cannot be arbitrarily changed.

Accordingly, the present invention has been made to solve the above problems, and by simplifying the wiring pattern, it is possible to design a wiring that can easily consider EMI countermeasures, and to provide a driving method of a liquid crystal display device having a structure that can arbitrarily change the gradation characteristics. It is.

The drive circuit of the display device of the present invention is a drive circuit of a display device that inputs image data required for image display output from a timing controller and outputs an applied voltage to the display device. Gradation voltage generating means for generating, image data changing means for changing the image data input to the driving circuit into image data corresponding to the applied voltage, and inputting the gradation voltage and the changed image data to the image data. And a D / A converter which selects the corresponding gray scale voltage and outputs it to the display device as the applied voltage.

In addition, the drive device of the display device of the present invention is a drive device of a display device that inputs image data required for image display output from a timing controller and outputs an applied voltage to the display device. Gradation voltage generating means for generating a voltage, image data changing means for changing the image data into image data corresponding to the applied voltage, and inputting the gradation voltage and the changed image data and corresponding to the image data. And a D / A converter which selects a gray scale voltage and outputs it to the display device as the applied voltage.

The display device driving method of the present invention is a driving method of a display device which inputs image data required for image display output from a timing controller and outputs an applied voltage to the display device. Generating a voltage; changing the image data into image data corresponding to the applied voltage; inputting the gray voltage and the changed image data and selecting the gray voltage corresponding to the image data; It is characterized by including the process of outputting to a display apparatus as a voltage.

Embodiment of the invention

Embodiment 1

Hereinafter, with reference to the drawings, a driving circuit, a driving device, and a driving method of the display device according to the first embodiment will be described. 1 is a block diagram of a display device according to one embodiment of the present invention. 1 is a timing controller, 2 is image data, 3 is synchronization signal, 5 is control signal for column driver (hereinafter, control signal (5)), 6 is power for column driver (hereinafter, power (6)), 7 is ground 8 is a column driver, 9 is a storage means, 11 is an applied voltage, 12 is a control signal for a row driver (hereinafter, a control signal 12), 13 is a row driver power supply (hereinafter, a power supply 13), 14 is The row driver, 15 is the applied voltage of the row driver, 16 is the liquid crystal panel.

The timing controller 1 for adjusting the timing receives the image data 2 and the synchronization signal 3 from the outside, and outputs the image data 2 and the control signal 5. The image data 2 is output unchanged by the timing controller 1 and input to the column driver 8. The control signal 5 is also output from the timing controller 1 and input to the column driver 8 in the same manner as the image data 2. The storage means 9 is a storage means for recording a parameter table, and stores a table value set for converting the image data 2 input to the column driver 8. The column driver 8 inputs the image data 2 and the control signal 5 and outputs an applied voltage 11 for driving the display device to the liquid crystal panel 16. The liquid crystal panel 16 is a liquid crystal panel for a liquid crystal display device conventionally used, and is composed of a liquid crystal layer sandwiched between a TFT substrate and a CF substrate.

 The row driver 14 is a control IC that inputs a control signal 12 output from the timing controller 1 and outputs an applied voltage 15 for turning on and off the TFT of the liquid crystal panel 16. The TFT is driven and the liquid crystal layer is oriented by the ON and OFF of the applied voltage 15 output from the row driver 14 to the liquid crystal panel 16. This makes it possible to display an image based on image data. The number of the column driver 8 and the row driver 14 is formed based on the number of pixels of the liquid crystal panel 16.

2 shows an internal block diagram of the column driver 8. 17 is a resistor, 101 is a D / A converter, 102 is image data changing means, 103 is a gradation voltage, and 104 is a table value. As a means for generating the gradation voltage 103, only the power supply voltage 6 and the ground 7 are connected to the resistor 17. Then, the input voltage is divided into resistances equally divided into n equal parts and input to the D / A converter 101 as n-1 gray voltages 103. By using the resistor 17 in this way, it is not necessary to form a plurality of power source voltages and can easily generate a gradation voltage.

In addition, the image data 2 is input to the image data changing means 102 and is changed into the image data 4 by the image data changing means 102 based on the table value 104 input from the storage means 9. And input to the D / A converter 101.

In the D / A converter 101, a desired gradation voltage corresponding to the image data 4 inputted by the image data changing means 102 is selected from the input gradation voltages 103, and the liquid crystal is applied as the applied voltage 11. Output to panel 16. In the D / A converter 101, image data 4 which is a digital signal is converted into an applied voltage 11 which is an analog signal.

The storage means 9 shown in Fig. 1 is provided with a read-only memory, which is characterized in that the contents can be electrically rewritten, such as an EEPROM. In addition, the parameter table is stored in the dedicated memory, and the table value 104 for changing the image data 2 into image data corresponding to the desired gradation characteristics is set and stored. On the other hand, the gradation characteristic refers to the relationship between the image data and the gradation voltage.

3 shows the relationship between the image data 2 and the gradation voltage 103. This is a gradation characteristic curve showing the relationship with the gradation voltage 103 selected on the basis of the image data 2. For example, as shown in FIG. 3A, when the user sets the desired gradation characteristic to the gradation characteristic B, Vref (d) is selected when the image data is Data (d), and the liquid crystal panel 16 is applied as the applied voltage 11. Will output The gradation characteristic B is linearity in which the relationship between the image data 2 and the gradation voltage is 1: 1, and the image data 2 does not need to be changed by the image data changing means 102.

However, when the user's desired gradation characteristic is set to the nonlinear gradation characteristic A as shown in Fig. 3B and the output voltage Vref (d) is to be outputted, the applied voltage is selected corresponding to the image data 4, so that D The image data 4 input to the / A converter 101 needs to be Data (d). In other words, even when the same applied voltage Vref (d) is output, the gray scale characteristics are different, so that the image data 2 shown in FIG. 3A and the image data 4 shown in FIG. 3B are different values. As described above, the change of the image data 4 is performed by the table value 104 input from the storage means 9 in the image data change means 102 of FIG. For example, the image data changing means 102 changes the image data 2 which was Data (c) into image data 4 which is Data (d) and inputs it to the D / A converter 101. The gradation voltage Vref (d) corresponding to the image data 4 is selected in the D / A converter 101 and output to the liquid crystal panel 16 as the applied voltage 11.

In addition, since the table value of the parameter table can be rewritten arbitrarily, the gray scale characteristic can be changed in accordance with the user's preference, and the applied voltage can be arbitrarily selected from Vref (a) to Vref (g).

The storage means 9 is configured to be connected to the outside of the column driver 8 as shown in FIG. In this case, the table values of the parameter table can be rewritten from the outside, thereby increasing the versatility.

In addition, as shown in FIG. 4, the storage means 9 can also be set as the structure formed in the inside of the column driver 8. As shown in FIG. By setting a large number of table values to form the structure inside, a wiring circuit can be reduced, and a driving circuit can be manufactured at low cost.

As described above, the gray scale voltage generating means is formed in the column driver 8 and the gray scale voltage is generated by connecting to the driving power source and the ground without forming the gray scale power source. As a result, the signal wiring from the timing controller to the column driver is simplified, allowing for EMI countermeasures.

In addition, since the image data changing means 102 is formed in the column driver 8 and has a storage means 9 for storing the table values set for changing the image data, the image data changing means 102 corresponds to the desired applied voltage. The image data can be changed. In addition, since the setting of the table value to be changed to the image data corresponding to the desired applied voltage can be changed, the desired gradation characteristics can be obtained. It is preferable to use the above-mentioned driving circuit, driving device, and driving method for a display device such as a liquid crystal display device. In the driving circuit according to the present embodiment, the gradation characteristics can be arbitrarily changed only by input data having a small gradation voltage or by input data only without inputting the gradation voltage. In addition, the gradation characteristics can be changed and the display quality can be improved with independent and high resolution for each data of R, G, and B. In particular, when mounted on a glass substrate such as COG, the input voltage can be reduced and the area required for wiring can be reduced by reducing the gradation voltage. Moreover, the problem of the voltage drop in the wiring resistance value on glass also disappears.

Embodiment 2

The drive apparatus which concerns on this embodiment is demonstrated using FIG. 5, FIG. Since the same code | symbol as the code | symbol attached in FIG.1, FIG.2 shows the same structure, description is abbreviate | omitted. In addition, description is abbreviate | omitted about the content demonstrated in Embodiment 1. FIG. In the first embodiment, the image data changing means 102 is formed in the column driver 8. In the second embodiment, the image data changing means 102 is formed in the timing controller 1 as shown in FIG. It was set as the structure. In the first embodiment, the image data 2 is output to the column driver 8 without correction in the timing controller 1, but the image controller 2 includes image data changing means 102, and the image data is provided. (2) is changed to image data (4) and output. The output image data 4 is input to the column driver 8.

The image data 2 is changed into the image data 4 based on the table value 104 inputted to the image data changing means 102 provided in the timing controller 1 and input from the storage means 9, and the column driver ( 8) to D / A converter 101.

6 shows an internal block diagram of the column driver 8. As a means for generating the gradation voltage, only the power supply voltage 6 and the ground 7 are connected to the resistor 17. Then, the input voltage is divided into resistances equally divided into n equal parts and input to the D / A converter 101 as n-1 gray voltages 103.

In the D / A converter 101, a desired gradation voltage corresponding to the image data 4 inputted by the image data changing means 102 included in the timing controller 1 is selected from the input gradation voltages 103. It outputs to the liquid crystal panel 16 as an applied voltage 11.

As shown in FIG. 5, the storage means 9 is configured to be connected to the outside of the timing controller 1. In this case, the table value 104 of the parameter table can be rewritten from the outside, thereby increasing the versatility.

In addition, as shown in FIG. 7, the storage means 9 may have a structure formed inside the timing controller 1. In the case of forming therein, an arbitrary gradation characteristic can be selected by setting a large number of table values. In addition, it is possible to manufacture a driving circuit at low cost, for example, to reduce wiring.

The configuration and driving method of the driving apparatus other than the one provided with the image data changing means 102 in the timing controller 1 are the same as those in the first embodiment.

As described above, the gray scale voltage generating means is formed in the column driver 8 and the gray scale voltage is generated by connecting to the driving power source and the ground without forming the gray scale power source. Therefore, signal wiring from the timing controller 1 to the column driver 8 is simplified, so that EMI countermeasures can be taken into account.

In addition, since the image data changing means 102 is formed in the timing controller 1 and has a storage means 9 for storing the table value 104 set for changing the image data 2, the structure is provided. The image data 4 corresponding to the desired applied voltage can be changed.

In addition, since the setting of the table value 104 to be changed to the image data 4 corresponding to the desired applied voltage 11 can be changed, the desired gradation characteristics can be obtained.

Embodiment 3

The structure of the drive apparatus which concerns on this embodiment is demonstrated using FIG. Since the same code | symbol as the code | symbol attached in FIG.1, FIG.2 shows the same structure, description is abbreviate | omitted. In addition, description is abbreviate | omitted about the content demonstrated in Embodiment 1, 2.

In the second embodiment, the image data changing means 102 is formed in the timing controller 1. In the third embodiment, as shown in FIG. 8, the data is changed between the timing controller 1 and the column driver 8. As shown in FIG. It was made into a structure. The image data 2 output from the timing controller 1 is input to the image data changing means 102. The image data changing means 102 changes the image data 2 into the image data 4 based on the table value input from the storage means 9. The image data 4 is input to the column driver 8. And this image data 4 is input into the D / A converter 101 formed in the column driver 8 as shown in FIG.

The storage means 9 is configured to be connected to the outside of the image data changing means 102 as shown in FIG. In this case, the table value 104 of the parameter table can be rewritten from the outside, thereby increasing the versatility.

In addition, as shown in FIG. 9, the storage means 9 can also have a structure formed inside the image data changing means 102. As shown in FIG. In the case of forming therein, an arbitrary gradation characteristic can be selected by setting a large number of table values. In addition, it is possible to manufacture a driving circuit at low cost, for example, to reduce wiring.

The configuration and driving method of the drive apparatus except for the one provided with the image data changing means 102 between the timing controller 1 and the D / A converter 101 are the same as those in the first and second embodiments.

As described above, the gray scale voltage generating means is formed in the column driver 9 and the gray scale voltage is generated by connecting to the driving power source and the ground without forming the gray scale power source. Therefore, signal wiring from the timing controller 1 to the column driver 8 is simplified, so that EMI countermeasures can be taken into account.

In addition, since the image data changing means 102 is formed in the timing controller 1 and has a storage means 9 for storing the table value 104 set for changing the image data 2, the structure is provided. The image data 4 corresponding to the desired applied voltage 11 can be changed.

In addition, since the setting of the table value 104 to be changed to the image data 4 corresponding to the desired applied voltage 11 can be changed, the desired gradation characteristics can be obtained.

The drive circuit of the display device of the present invention is a drive circuit of a display device that inputs image data required for image display output from a timing controller and outputs an applied voltage to the display device. Gradation voltage generating means for generating, image data changing means for changing the image data input to the driving circuit into image data corresponding to the applied voltage, and inputting the gradation voltage and the changed image data to the image data. And a D / A converter which selects the corresponding gradation voltage and outputs it to the display device as the applied voltage. Therefore, signal wiring from the timing controller to the column driver is simplified, and EMI countermeasures can be considered. The image data corresponding to the desired applied voltage can be changed.

In addition, the drive device of the display device of the present invention is a drive device of a display device that inputs image data required for image display output from a timing controller and outputs an applied voltage to the display device. Gradation voltage generating means for generating a voltage, image data changing means for changing the image data into image data corresponding to the applied voltage, and the gradation corresponding to the image data by inputting the gradation voltage and the changed image data. Since the D / A converter selects the voltage and outputs it to the display device as the applied voltage, signal wiring from the timing controller to the column driver is simplified, and EMI countermeasures can be taken into account. Can be changed to image data corresponding to the. In addition, it is preferable to use this drive device for display devices, such as a liquid crystal display device.

The display device driving method of the present invention is a driving method of a display device which inputs image data required for image display output from a timing controller and outputs an applied voltage to the display device. Generating a voltage; changing the image data into image data corresponding to the applied voltage; inputting the gray voltage and the changed image data and selecting the gray voltage corresponding to the image data; Since the process of outputting to a display apparatus as a voltage was provided, it can change into image data corresponding to a desired applied voltage.

Claims (9)

In a driving circuit of a display device for inputting image data required for image display output from a timing controller and outputting an applied voltage to the display device, A gradation voltage generating means connected to only a ground and a power supply to generate a gradation voltage; Image data changing means for changing the image data input to the driving circuit into image data corresponding to the applied voltage by a table value corresponding to a nonlinear gradation characteristic; And a D / A converter for inputting the gradation voltage and the changed image data, selecting the gradation voltage corresponding to the image data, and outputting the applied gradation voltage to the display device as the applied voltage. A driving device of a display device for inputting image data required for image display output from a timing controller and outputting an applied voltage to the display device. A gradation voltage generating means connected to only a ground and a power supply to generate a gradation voltage; Image data changing means for changing the image data into image data corresponding to the applied voltage by a table value corresponding to a nonlinear gradation characteristic; And a D / A converter for inputting the gradation voltage and the changed image data, selecting the gradation voltage corresponding to the image data, and outputting the applied gradation voltage to the display device as the applied voltage. The method of claim 2, And said image data changing means is provided in said timing controller. The method of claim 2, And said image data changing means is provided between said timing controller and said D / A converter. The method according to any one of claims 2 to 4, And said image data changing means comprises storage means for storing table values set for changing image data. The method of claim 5, And said storage means makes it possible to arbitrarily change the gradation characteristics. A display device comprising the drive device according to any one of claims 2 to 4 and a display panel.  In the driving method of the display apparatus which inputs image data required for image display output from a timing controller, and outputs an applied voltage to a display apparatus, Generating a gradation voltage by connecting only to ground and a power supply; Changing the image data into image data corresponding to the applied voltage by a table value corresponding to a nonlinear gradation characteristic; And inputting the gradation voltage and the changed image data, selecting the gradation voltage corresponding to the image data, and outputting the applied gradation voltage to the display device as the applied voltage. The method of claim 8, And the step of changing the image data includes setting a table value for changing the image data.

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