KR20220082197A - Malfunction prevention circuit, data driving device including the same, and method of preventing malfunction of data driving device - Google Patents

Abstract

The present embodiment relates to a malfunction prevention circuit, a data driving device including the same, and a method for preventing a malfunction of the data driving device, and more particularly, whether an internal circuit malfunction occurs by detecting the resolution of frame data in the data driving device of the display device. A malfunction prevention circuit for determining and resetting an internal circuit when a malfunction occurs, a data driving device including the same, and a method for preventing a malfunction of the data driving device.

Description

Malfunction prevention circuit, data driving device including same, and method of preventing malfunction of data driving device

The present embodiment relates to a malfunction prevention circuit, a data driving device including the same, and a method for preventing a malfunction of the data driving device.

As information technology develops, the market for display devices, which is a connection medium between users and information, is growing. Accordingly, the use of display devices such as an organic light emitting display (OLED), a liquid crystal display (LCD), and a plasma display panel (PDP) is increasing.

In other words, the display device is widely used in devices such as notebook computers, computer monitors, televisions, smart phones, and automobile dashboards and infotainment systems.

Here, when the battery of the notebook or smart phone deteriorates or an abnormality occurs, the power supplied to the display device may be temporarily unstable. Also, power supplied to the display device may be temporarily unstable even when the vehicle is started.

In this case, a malfunction may occur in an internal circuit of the display device, and the image quality of the display device may deteriorate due to the malfunction of the internal circuit.

Against this background, it is an object of the present invention to provide a technique for detecting the resolution of frame data in a data driving device of a display device to determine whether an internal circuit malfunction has occurred, and to reset the internal circuit when a malfunction occurs.

In order to achieve the above object, in one aspect, the present embodiment receives an input signal including image data and a clock from a data processing apparatus, restores the clock from the input signal, and uses the clock to input the input signal. a clock/data recovery unit for recovering the image data from a signal; Detects the resolution of one frame data included in the image data, compares the resolution of the one frame data with a previously stored reference value, and includes the clock/data restoration unit when the reference value and the resolution of the one frame data are different from each other There is provided a data driving device including a driving controller for transmitting a reset request signal for resetting an internal circuit to the data processing device.

The data driving device receives and stores the image data from the clock/data restoration unit, outputs the one frame data in units of horizontal line data, and outputs an internal signal each time one horizontal line data is output from the one frame data. It may further include a data register that is generated and output to the driving control unit.

The resolution of one frame data is the vertical resolution of the one frame data, and the driving control unit calculates a count value by counting the number of times of input of the internal signal during one frame period corresponding to the one frame data, and uses the count value as the count value. It can be recognized by the vertical resolution of one frame data.

The driving control unit may receive one or more frame start signals from the data processing apparatus to classify the one frame section.

When the count value is greater than the reference value or a preset maximum count value, the driving controller may transmit the reset request signal to the data processing apparatus.

When the driving control unit transmits the reset request signal to the data processing apparatus, the clock/data restoration unit receives a reset signal from the data processing apparatus, and the clock/data restoration unit and the data register are reset by the reset signal. can be

The driving control unit detects two or more resolutions of frame data from the image data before detecting the resolution of the one frame data, compares the two or more resolutions with each other, and when the two or more resolutions are the same as a first value, the first The value may be stored as the reference value.

When a resolution having a second value different from the first value exists among the two or more resolutions, the driving controller may transmit the reset request signal to the data processing apparatus.

In another aspect, the present embodiment provides a malfunction prevention circuit of a data driving device, comprising: a resolution detecting unit configured to detect a resolution of one frame data included in image data; a reference value setting unit for setting and storing a reference value for determining whether the data driving device malfunctions; The resolution of the one frame data is compared with the reference value, and when the resolution of the reference value and the one frame data is different, a malfunction detection signal is output, and when the reference value and the resolution of the one frame data are the same, a malfunction detection signal is not detected. a malfunction detection unit that outputs and when the malfunction detection signal is input, a first level lock state signal is output and transmitted to the data processing apparatus, and when the malfunction detection signal is inputted, a reset request signal that is a second level lock state signal is output and the Provided is a malfunction prevention circuit including a lock state determining unit that is transmitted to a data processing device.

The resolution detecting unit receives an internal signal from the data register of the data driving device a plurality of times during one frame period corresponding to the one frame data, counts the number of times of input of the internal signal during one frame period, and calculates a count value, The count value may be recognized as the resolution of the one frame data.

The resolution detecting unit detects two or more resolutions of frame data included in the image data before detecting the resolution of the one frame data, and the reference value setting unit compares the two or more resolutions with each other so that the two or more resolutions are set to a first value. If the same, the first value may be stored as the reference value.

The lock state determining unit receives the internal lock signal from the clock/data restoration unit of the data driving device, and when the malfunction non-detection signal is input, reflects the level of the internal lock signal to determine the level of the lock state signal; When the malfunction detection signal is input, the reset request signal may be output regardless of the level of the internal lock signal.

When the malfunction detection signal is input and the level of the internal lock signal is the first level, the lock state determiner outputs the lock state signal of the first level, the malfunction non-detection signal is input, and the level of the internal lock signal is At the second level, the reset request signal may be output.

In another aspect, the present embodiment provides a method for preventing a malfunction of a data driving apparatus, the method comprising: receiving image data from a data processing apparatus, and detecting a resolution of one frame data included in the image data; comparing a previously stored reference value with the resolution of the one frame data; transmitting a reset request signal for resetting an internal circuit to the data processing apparatus when the resolution of the one frame data is different from the reference value; and resetting the internal circuit by receiving a reset signal from the data processing device.

The method may include, before the detecting, detecting two or more resolutions of frame data in the image data; comparing the two or more resolutions with each other; and if the two or more resolutions are the same as the first value, storing the first value as the reference value.

As described above, according to this embodiment, the data driving device detects the resolution of frame data to determine whether an internal circuit malfunction has occurred, and when a malfunction occurs, a reset request signal is transmitted to the data processing device to quickly reset the internal circuit. Therefore, deterioration of the image quality of the display device due to a malfunction of the internal circuit can be prevented in advance.

1 is a block diagram of a display device according to an embodiment.
2 is a block diagram of a data driving device according to an exemplary embodiment.
3 is a configuration diagram of a driving control unit according to an exemplary embodiment.
4 is a flowchart illustrating a process of setting a reference value in a data driving apparatus according to an exemplary embodiment.
5 is a flowchart illustrating an additional process of setting a reference value in the data driving apparatus according to an exemplary embodiment.
6 is a flowchart illustrating a process of preventing a malfunction in the data driving apparatus according to an exemplary embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is formed between each component. It should be understood that elements may also be “connected,” “coupled,” or “connected.”

1 is a block diagram of a display device according to an embodiment.

Referring to FIG. 1 , the display device 100 may include a display panel 110 , a data driving device 120 , a gate driving device 130 , and a data processing device 140 .

A plurality of data lines DL and a plurality of gate lines GL may be disposed on the display panel 110 , and a plurality of pixels P may be disposed.

The display panel 110 may be a liquid crystal display panel. The display panel 110 may be another type of panel such as an organic light emitting diode (OLED) panel.

The gate driving device 130 may supply a gate driving signal of a turn-on voltage or a turn-on voltage to the gate line GL. When the gate driving signal of the turn-on voltage is supplied to the pixel P, the pixel P is connected to the data line DL. Then, when the gate driving signal of the turn-off voltage is supplied to the pixel P, the connection between the corresponding pixel P and the data line DL is released.

The data driving device 120 may convert the image data RGB received from the data processing device 140 into a data voltage. In addition, a data voltage may be supplied to the data line DL. The data voltage supplied to the data line DL is supplied to the pixel P according to the gate driving signal.

The data processing device 140 may supply a control signal to the gate driving device 130 and the data driving device 120 . For example, the data processing apparatus 140 may transmit a gate control signal GCS for starting a scan to the gate driving apparatus 130 .

The data processing device 140 may convert externally input image data to match the data format used by the data driving device 120 , and transmit the converted image data RGB to the data driving device 120 . Also, the data processing device 140 may transmit a data control signal DCS for controlling the data driving device 120 to supply a data voltage to each pixel P. Here, the image data RGB may be divided in units of frame sections. In other words, the image data RGB may include a plurality of frame data. In addition, the frame data may include a plurality of horizontal line data, and the number of the plurality of horizontal line data may be the resolution of the frame data, that is, the vertical resolution.

For example, if the number of horizontal line data included in the frame data is 1080, the resolution of the frame data, that is, the vertical resolution, may be 1080.

In an embodiment, the gate control signal GCS and the data control signal DCS may include a gate start pulse (GSP) indicating a frame period. The data driving device 120 and the gate driving device 130 may classify a frame section according to the frame start signal.

Meanwhile, in an embodiment, the data driving device 120 may detect the resolution of frame data, determine whether a malfunction of the internal circuit has occurred according to the detected resolution, and quickly reset the internal circuit when a malfunction occurs. It is possible to prevent the user from recognizing a malfunction of the display apparatus 100 .

A detailed description of this is as follows.

2 is a block diagram of a data driving apparatus according to an exemplary embodiment.

Referring to FIG. 2 , the data driver 120 includes a clock/data recovery unit 211 , a data register 212 , a shift register unit 213 , a latch unit 214 , an output unit 215 , and a multiplexer ( 216 ) and a driving control unit 217 .

The clock/data recovery unit 211 may receive image data (RGB of FIG. 1 ) and an input signal EPI0/1 including a clock from the data processing apparatus 140 . Here, the input signal EPI0/1 may be in the form of a differential signal, and image data may be included in the input signal EPI0/1 in the form of a data packet.

The clock/data restoration unit 211 may restore a clock from the input signal EPI0/1 and restore image data (DATA_A, DATA_B, and DATA_C of FIG. 2 ) from the input signal using the clock. Here, the image data may be restored in the form of a data packet. For example, the data packet may be formed of 8-bit image data for one channel.

In an embodiment, the clock/data recovery unit 211 may receive a clock training pattern signal from the data processing device 140 before receiving the input signal EPI0/1 from the data processing device 140 , and clock training. Clock training may be performed using the pattern signal.

The clock/data recovery unit 211 that synchronizes the clocks through clock training may generate an internal lock signal Lock_int of a first level and output it to the driving control unit 217 to be described later.

When noise is temporarily introduced into the data driving device 120 , clock synchronization may be broken. In this case, the clock/data recovery unit 211 may generate an internal lock signal Lock_int of the second level and output it to the driving control unit 217 . Here, the first level may be a high voltage level corresponding to the binary number 1, and the second level may be a low voltage level corresponding to the binary number O.

Conversely, the first level may be a low voltage level corresponding to binary 0, and the second level may be a high voltage level corresponding to binary 1.

The data register 212 may receive and store image data from the clock/data recovery unit 211 .

The data register 212 may output image data to the latch unit 214 .

Here, the data register 212 may output frame data included in the image data in units of horizontal line data. In other words, a plurality of horizontal line data included in one frame data may be sequentially output.

In an embodiment, the data register 212 may generate an internal signal Inter_sig each time one horizontal line data is output from the frame data and output it to the driving controller 217 . This internal signal Inter_sig is used when the driving control unit 217 detects the resolution of frame data.

In an embodiment, when power supplied to the display device 100 is unstable or noise is introduced into the data driving device 120 , a malfunction may occur in the data register 212 .

For example, the data register 212 may continuously and repeatedly output the same horizontal line data. In this case, the data register 212 may output more horizontal line data than the actual number of horizontal line data included in the frame data. In addition, the data register 212 may output more internal signals Inter_sig than the actual number to the driving controller 217 .

As another example, a number of internal signals Inter_sig greater than the number of times the data register 212 outputs horizontal line data may be output to the driving controller 217 .

The shift register unit 213 may provide the latch enable signal L_enable to the latch unit 214 in response to the shift clock SC and the carry signal Carry Out. Here, the shift register unit 213 may include a plurality of shift registers, one for each channel of the data driver 120 .

The latch unit 214 may latch image data in response to a latch enable signal of the shift register unit 213 and output the latched image data to the output unit 215 . Here, the latch unit 214 may include a plurality of latches, one for each channel of the data driving device 120 .

The output unit 215 may convert the image data of each channel into a data voltage and output it to the multiplexer 216 . Here, the output unit 215 may include a plurality of digital analog converters (DACs) and a plurality of output buffers, one for each channel of the data driving device 120 .

The multiplexer 216 may sequentially output the data voltage of each channel to the display panel 110 .

The driving controller 217 may detect the resolution of frame data included in the image data. Here, the resolution of the frame data may be a vertical resolution.

In an embodiment, the driving controller 217 may calculate the count value by counting the number of times of input of the internal signal Inter_sig input from the data register 212 during a frame period corresponding to frame data. And the count value can be recognized as the resolution of the frame data, that is, the vertical resolution.

Here, the driving control unit 217 may receive one or more frame start signals GSP from the data processing apparatus 140 to classify frame sections.

As described above, the driving control unit 217 that has detected the resolution of the frame data may compare the resolution of the frame data with a pre-stored reference value.

When the reference value and the resolution of the frame data are the same, the driving control unit 217 may transmit the first level lock status signal Lock_status to the data processing apparatus 140 .

In other words, when the data driving device 120 operates normally, the driving controller 217 may transmit the first level lock status signal Lock_status to the data processing device 140 .

When the reference value and the resolution of the frame data are different, the driving control unit 217 may transmit a reset request signal that is a second level lock status signal Lock_status to the data processing device 140 . Here, when the resolution of the reference value and the frame data is different, that is, when the reference value and the count value are different, the data register 212 may output more internal signals than the actual number of horizontal line data included in the frame data.

Accordingly, when the count value is greater than the reference value or the preset maximum count value, the driving controller 217 may transmit a reset request signal to the data processing apparatus 140 .

Meanwhile, in an embodiment, the reference value may be an actual resolution of frame data detected by the driving controller 217 when the data driving device 120 is in a normal state.

The driving controller 217 may detect a resolution for setting a reference value before detecting the resolution of the frame data for determining whether the data driving device 120 malfunctions.

Specifically, the driving controller 217 may detect two or more resolutions of frame data from the image data. In addition, if two or more resolutions are compared with each other and the two or more resolutions are the same as the first value, the first value may be stored as a reference value.

For example, when the resolution of frame data first detected from the image data is 1080 and the resolution of frame data detected secondarily from the image data is also 1080, the driving controller 217 may store 1080 as a reference value.

In order to increase the reliability of the reference value, the driving control unit 217 detects the resolution of the frame data from the image data in the third order, and if the resolution of the frame data detected in the third is 1080 equal to the primary resolution and the secondary resolution, 1080 is used as the reference value. You can also save it.

When the driving control unit 217 sets the reference value, if there is a resolution having a second value different from the first value among two or more resolutions, the driving control unit 217 transmits a reset request signal, which is a second level lock state signal, to the data processing apparatus It can be transmitted to (140).

For example, when the primary resolution is 1080 and the secondary resolution is 1150 , the driving controller 217 may transmit a reset request signal to the data recovery device 140 .

When the driving control unit 217 detects the tertiary resolution when setting the reference value, the primary resolution and the secondary resolution are 1080, and if the tertiary resolution is 1150, the driving control unit 217 sends a reset request signal to the data processing device 140 ) can be transmitted.

Meanwhile, in an embodiment, the driving control unit 217 may receive an internal lock signal Lock_int from the clock/data restoration unit 211 . In addition, when the reference value and the resolution of the frame data are the same, the level of the lock status signal Lock_status may be determined by reflecting the level of the internal lock signal Lock_int. When the reference value and the resolution of the frame data are different, the reset request signal may be transmitted to the data processing apparatus 140 regardless of the level of the internal lock signal Lock_int.

When the level of the internal lock signal (Lock_int) input to the driving control unit 217 is the first level in a situation where the reference value and the resolution of the frame data are the same, the driving control unit 217 transmits the first level lock state signal to the data processing device ( 140) can be transmitted.

When the level of the internal lock signal (Lock_int) input to the driving control unit 217 is the second level in a situation where the reference value and the resolution of the frame data are the same, the driving control unit 217 transmits the reset request signal that is the second level of the lock state signal. The data may be transmitted to the data processing device 140 .

As described above, when the driving control unit 217 transmits the reset request signal to the data processing device 140 , the data processing device 140 may generate a reset signal and transmit it to the clock/data recovery unit 211 .

When the clock/data recovery unit 211 receives the reset signal, the internal circuits of the data driving device 120 including the clock/data recovery unit 211 and the data register 211 may be reset. Here, the reset signal may be a signal in which the first level or the second level continues for a predetermined time.

After the internal circuit of the data driving device 120 is reset, the data processing device 140 transmits a set value data signal CFG, a clock training pattern signal, etc. for initial setting of the data driving device 120 to the clock/data recovery unit. It can be transmitted to (211).

Through this, the data driving device 120 can restore the internal circuit to a normal state.

In an embodiment, the driving control unit 217 may repeatedly perform the process of determining whether an internal circuit malfunction occurs according to the resolution of the frame data in units of frame data of the image data. Here, the driving control unit 217 may receive one or more frame start signals GSP from the data processing device 140 to classify a frame period of frame data, and a frame start signal GSP instructing a start of new frame data. ) is received, the previously calculated count value may be initialized.

The above driving control unit 217 includes the following configuration.

3 is a block diagram of a driving control unit according to an exemplary embodiment.

Referring to FIG. 3 , the driving control unit 217 may include a resolution detection unit 310 , a reference value setting unit 320 , a malfunction detection unit 330 , and a lock state determination unit 340 .

The resolution detector 310 detects the resolution of frame data included in the image data.

Specifically, the resolution detector 310 may calculate the count value cnt_value by counting the number of times of input of the internal signal Inter_sig input from the data register 212 during the frame period corresponding to the frame data. In addition, the count value cnt_value may be detected with the resolution of the frame data, that is, the vertical resolution.

Here, the resolution detecting unit 310 may receive one or more frame start signals GSP from the data processing apparatus 140 to classify a frame section of frame data, and a frame start signal GSP instructing a start of new frame data. ) is received, the previously calculated count value may be initialized.

The resolution detection unit 310 may output the resolution of the frame data to the reference value setting unit 320 and the malfunction detection unit 330 .

The reference value setting unit 320 may set and store a reference value (ref_value) for determining whether the data driving device 120 malfunctions.

The reference value setting unit 320 may store the first value as the reference value when the resolution of two or more frame data detected by the resolution detection unit 310 is the same as the first value.

Specifically, when the resolution detecting unit 310 detects the resolution of the first frame data, the reference value setting unit 320 may store the resolution of the first frame data as a temporary reference value.

Thereafter, when the resolution detection unit 310 outputs the resolution of the second frame data to the reference value setting unit 320 and the malfunction detection unit 330 , the reference value setting unit 320 may output a temporary reference value to the malfunction detection unit 330 . have.

The malfunction detection unit 330 receiving the temporary reference value and the resolution of the second frame data may compare the temporary reference value and the resolution of the second frame data. In addition, when the temporary reference value and the resolution of the second frame data are the same, the malfunction detection unit 330 may output the malfunction non-detection signal nor_chk to the reference value setting unit 320 and the lock state determination unit 340 .

The reference value setting unit 320 may store the temporary reference value as a reference value after confirming that a signal for not detecting a malfunction for the resolution of the second frame data is input.

The reference value setting unit 217 may set the reference value based on a result of comparing the temporary reference value and the resolution of the third frame data in the malfunction detection unit 330 in order to increase the reliability of the reference value.

Specifically, after the malfunction detection unit 330 outputs a non-malfunction signal with respect to the resolution of the second frame data, the malfunction detection unit 330 may compare the temporary reference value with the resolution of the third frame data. When the resolution of the temporary reference value and the third frame data is the same, the malfunction detection unit 330 may output a malfunction detection signal to the reference value setting unit 320 and the lock state determination unit 340 .

The reference value setting unit 320 may store the temporary reference value as a reference value after confirming that a signal for not detecting a malfunction for the resolution of the third frame data is input.

On the other hand, when the resolution of the temporary reference value and the second frame data is different, or the resolution of the temporary reference value and the third frame data is different, the malfunction detection unit 330 sets the reference value setting unit 320 and the lock state for the malfunction detection signal abnor_chk. It can output to the unit 340 .

In this case, the internal circuit of the data driving device 120 may be initialized, and the reference value setting unit 320 repeats the above process after storing the resolution of the third frame data or the resolution of the fourth frame data as a temporary reference value. You can set a reference value by doing it. Here, the reference value setting unit 320 may receive one or more frame start signals GSP to classify a frame section of each frame data.

The malfunction detection unit 330 may compare the resolution of one frame data received from the resolution detection unit 310 with a reference value received from the reference value setting unit 320 .

As a result of the comparison, when the resolution of one frame data is different from the reference value, the malfunction detection unit 330 may output a malfunction detection signal.

When the reference value and the resolution of one frame data are the same, the malfunction detection unit 330 may output a malfunction detection signal. Here, the malfunction detection signal and the malfunction detection signal may be signals having different voltage levels. For example, the malfunction detection signal may be a first level signal, and the malfunction non-detection signal nor_chk may be a second level signal.

Meanwhile, the malfunction detection unit 330 may compare a temporary reference value with the resolution of two or more frame data before comparing the reference value with the resolution of one frame data. In addition, the erroneous operation detection signal or the erroneous operation non-detection signal may be output with respect to the temporary reference value and the resolution of two or more frame data.

When a malfunction detection signal is input from the malfunction detection unit 330 , the lock status determiner 340 may output a first level lock status signal Lock_status and transmit it to the data processing device 140 .

In other words, when the data driving device 120 operates normally, the lock status determiner 340 may transmit the first level lock status signal to the data processing device 140 .

When a malfunction detection signal is input from the malfunction detection unit 330 , the lock status determiner 340 may output a reset request signal that is a second level lock status signal Lock_status and transmit it to the data processing device 140 . When the lock state determiner 340 transmits a reset request signal to the data processing device 140 , the internal circuit of the data driving device 120 may be reset. In other words, the data driving device 120 may be reset.

Meanwhile, in an embodiment, the lock state determiner 340 may receive an internal lock signal Lock_int from the clock/data restore unit 211 .

Here, when a malfunction detection signal is received from the malfunction detection unit 330 , the lock state determiner 340 may determine the level of the lock state signal by reflecting the level of the internal lock signal Lock_int.

When a malfunction detection signal is received from the malfunction detection unit 330 , the lock state determiner 340 may transmit a reset request signal to the data processing apparatus 140 irrespective of the level of the internal lock signal.

When the level of the internal lock signal input to the lock state determiner 340 is the first level in a situation in which the malfunction detection signal is received, the lock state determiner 340 transmits the first level lock state signal to the data processing apparatus ( 140) can be transmitted.

When the level of the internal lock signal input to the lock state determiner 340 is the second level in a situation in which the malfunction detection signal is received, the lock state determiner 340 transmits the reset request signal that is the second level of the lock state signal. The data may be transmitted to the data processing device 140 .

As described above, the data driving device 120 according to an embodiment may determine whether an internal circuit malfunction occurs by detecting the resolution of frame data. In addition, when a malfunction occurs, the internal circuit can be quickly reset by transmitting a reset request signal to the data processing device 140 . Accordingly, deterioration of the image quality of the display apparatus 100 due to a malfunction of the data driving apparatus 120 can be prevented in advance.

Hereinafter, a process of setting a reference value in the data driving device 120 and a process of preventing an erroneous operation will be described.

4 is a flowchart illustrating a process of setting a reference value in the data driving apparatus according to an embodiment, and FIG. 5 is a flowchart illustrating an additional process of setting a reference value in the data driving apparatus according to an embodiment.

Referring to FIG. 4 , the data driving apparatus 120 may first detect the resolution of the first frame data from the image data ( S410 ).

In addition, the data driving device 120 may secondarily detect the resolution of the second frame data (S420).

The data driving device 120 compares the primary resolution and the secondary resolution, and when the primary resolution and the secondary resolution are different, the data driving device 120 may transmit a reset request signal, which is a second level lock state signal, to the data processing device 140 . There is (S440, S450). In addition, the data driving device 120 may reset the internal circuit through the reset signal received from the data processing device 140 , and re-execute the step S410 .

On the other hand, if the primary resolution and the secondary resolution are the same as the first value, the data driving device 120 transmits the first level lock state signal to the data processing device 140 , and stores the first value as a reference value. There is (S460, S470).

After the step S460, the data driving device 120 may thirdly detect the resolution of the third frame data as shown in FIG. 5 (S510).

In addition, the secondary resolution and the tertiary resolution identical to the primary resolution may be compared ( S520 ).

If the secondary resolution and the tertiary resolution are different from each other, steps S440 and S450 may be performed.

When the secondary resolution and the tertiary resolution are the same as the first value, the data driving device 120 may maintain the first level lock state signal and store the first value as a reference value as shown in S470 of FIG. 4 ( S530 ). ).

6 is a flowchart illustrating a process of preventing a malfunction in a data driving device according to an embodiment.

The data driving device 120 having set the reference value as shown in FIG. 4 or 5 may detect the resolution of one frame data and compare the resolution of the one frame data with the reference value (S610 and S620).

As a result of the comparison, if the resolution of one frame data and the reference value are the same, the data driving device 120 may transmit the first level lock state signal to the data processing device 140 ( S630 and S640 ). In addition, the data driving device 120 may re-implement the steps S610 to S630 for the next frame data.

When the resolution of one frame data and the reference value are different from each other in step S630 , the day driving device 120 may transmit a reset request signal, which is a second level lock state signal, to the data processing device 140 ( S650 ).

The data driving device 120 may receive a reset signal from the data processing device 140 and may reset an internal circuit through the reset signal (S660). Here, the reset signal may be a signal in which the first level or the second level continues for a predetermined time.

The data driving device 120 resetting the internal circuit may receive the set value data signal CFG, the clock training pattern signal, and the like from the data processing device 140 to restore the internal circuit to a normal state.

The data driving device 120 may repeat the above process in units of frame data of image data.

Claims (15)

a clock/data recovery unit for receiving an input signal including image data and a clock from the data processing apparatus, recovering the clock from the input signal, and recovering the image data from the input signal using the clock;
Detects the resolution of one frame data included in the image data, compares the resolution of the one frame data with a previously stored reference value, and includes the clock/data restoration unit when the reference value and the resolution of the one frame data are different from each other A driving control unit that transmits a reset request signal for resetting an internal circuit to the data processing device
A data driving device comprising a. The method of claim 1,
The image data is received and stored from the clock/data restoration unit, the one frame data is output in units of horizontal line data, and an internal signal is generated every time one horizontal line data is output from the one frame data. Data register output to drive control unit
A data driving device further comprising a. 3. The method of claim 2,
The resolution is a vertical resolution of the one frame data, and the driving control unit calculates a count value by counting the number of times of input of the internal signal during one frame period corresponding to the one frame data, and uses the count value as the one frame data A data driving device that recognizes the vertical resolution of 4. The method of claim 3,
The driving control unit receives one or more frame start signals from the data processing device to classify the one frame section. 4. The method of claim 3,
The driving control unit transmits the reset request signal to the data processing device when the count value is greater than the reference value or a preset maximum count value. 3. The method of claim 2,
When the driving control unit transmits the reset request signal to the data processing apparatus, the clock/data restoration unit receives a reset signal from the data processing apparatus, and the clock/data restoration unit and the data register are activated by the reset signal. A data driver that is reset. The method of claim 1,
The driving control unit detects two or more resolutions of frame data from the image data before detecting the resolution of the one frame data, compares the two or more resolutions with each other, and when the two or more resolutions are the same as a first value, the first A data driving device for storing 1 value as the reference value. 8. The method of claim 7,
The driving control unit transmits the reset request signal to the data processing apparatus when a resolution having a second value different from the first value exists among the two or more resolutions. In the malfunction prevention circuit of a data driving device,
a resolution detector for detecting a resolution of one frame data included in the image data;
a reference value setting unit for setting and storing a reference value for determining whether the data driving device malfunctions;
The resolution of the one frame data is compared with the reference value, and when the resolution of the reference value and the one frame data is different, a malfunction detection signal is output, and when the reference value and the resolution of the one frame data are the same, a malfunction detection signal is not detected. a malfunction detection unit that outputs and
When the malfunction detection signal is input, a first level lock status signal is output and transmitted to the data processing apparatus. When the malfunction detection signal is input, a reset request signal that is a second level lock status signal is outputted to the data Lock status determination unit that transmits to the processing unit
A malfunction prevention circuit comprising a. 10. The method of claim 9,
The resolution detecting unit receives an internal signal from the data register of the data driving device a plurality of times during one frame period corresponding to the one frame data, counts the number of times the internal signal is input during one frame period, and calculates a count value; A malfunction prevention circuit for recognizing the count value as a resolution of the one frame data. 10. The method of claim 9,
The resolution detecting unit detects two or more resolutions of frame data included in the image data before detecting the resolution of the one frame data, and the reference value setting unit compares the two or more resolutions with each other so that the two or more resolutions are set to a first value. is the same, the malfunction prevention circuit for storing the first value as the reference value. 10. The method of claim 9,
The lock state determining unit receives an internal lock signal from the clock/data restoration unit of the data driving device, and when the malfunction non-detection signal is input, reflects the level of the internal lock signal to determine the level of the lock state signal; , a malfunction prevention circuit for outputting the reset request signal regardless of the level of the internal lock signal when the malfunction detection signal is input. 13. The method of claim 12,
When the malfunction detection signal is input and the level of the internal lock signal is the first level, the lock state determiner outputs the lock state signal of the first level, the malfunction non-detection signal is input, and the level of the internal lock signal If the second level, the malfunction prevention circuit outputs the reset request signal. A method for preventing malfunction of a data driving device, the method comprising:
receiving image data from a data processing apparatus and detecting a resolution of one frame data included in the image data;
comparing a previously stored reference value with the resolution of the one frame data;
transmitting a reset request signal for resetting an internal circuit to the data processing apparatus when the resolution of the one frame data is different from the reference value; and
Receiving a reset signal from the data processing device to reset the internal circuit
A method of preventing malfunction of a data driving device comprising a. 15. The method of claim 14, wherein prior to the detecting step
detecting two or more resolutions of frame data from the image data;
comparing the two or more resolutions with each other; and
If the two or more resolutions are the same as the first value, storing the first value as the reference value
A method of preventing malfunction of the data driving device further comprising a.

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