JP2022072553A - Liquid crystal display device and method for driving the same - Google Patents

Abstract

To provide a liquid crystal display device capable of suppressing deterioration in a display quality even when a scanning line has a multilayered wiring structure, and a method for driving the same.SOLUTION: A liquid crystal display device includes switching elements, a plurality of pixels that are connected to the switching elements and have a liquid crystal capacitance, a plurality of scanning lines that are connected to each of the switching elements and transmit a scanning signal for turning the switching elements ON, a plurality of signal lines that are connected to each of the switching elements and transmit a display signal applied to the liquid crystal capacitance through the switching elements, and a signal line driving circuit for applying the display signal to each of the plurality of signal lines. The plurality of scanning lines have a multilayered wiring structure. The signal line driving circuit applies a display signal obtained by adding different correction values to each layer of the scanning lines to the corresponding signal lines.SELECTED DRAWING: Figure 3

Description

The present embodiment relates to a liquid crystal display device and a driving method thereof.

An active matrix type liquid crystal display device using a thin film transistor (TFT) as an active element is known. The liquid crystal display device has a display electrode, a common electrode, and a pixel. The pixel includes a liquid crystal layer sandwiched between the display electrode and the common electrode. In the liquid crystal display device, the gradation at the time of display can be changed by controlling the magnitude of the voltage applied to the display electrode via the TFT.

Here, the liquid crystal used in the liquid crystal display device deteriorates when a DC voltage is continuously applied. Therefore, the liquid crystal display device is driven by an AC drive that inverts the polarity of the voltage applied to the liquid crystal layer at regular intervals, for example, for each frame. In the case of AC drive, a feedthrough voltage is generated at the timing when the TFT is switched from on to off. Due to the feedthrough voltage, the voltage applied to the display electrode drops. Therefore, in order to display at an appropriate gradation level, it is necessary to correct the voltage drop due to the feedthrough voltage. Conventionally, the voltage drop due to the feedthrough voltage is corrected by increasing the common voltage applied to the common electrode by the amount of the voltage drop corresponding to the feedthrough voltage.

Further, in recent years, there is a demand for further narrowing of the frame of the display panel of the liquid crystal display device. As a method for narrowing the frame of the display panel, a method for forming the scanning line for driving the TFT into a multi-layer wiring structure is known. In the case of a multi-layer wiring structure, even if the same wiring material is used, the performance such as the width of the wiring changes depending on the difference in the conditions for forming the wiring. Changes in the width of the scanning line and the like lead to changes in the feedthrough voltage. That is, in the multilayer wiring structure, the feedthrough voltage may change from layer to layer. Since the feed-through voltage is different for each layer, the display quality deteriorates such as horizontal streaks and flicker during display.

Japanese Unexamined Patent Publication No. 2006-171387

When the feedthrough voltage is different for each layer, the voltage drop due to the feedthrough voltage cannot be corrected by changing the common voltage.

The present embodiment provides a liquid crystal display device capable of suppressing deterioration of display quality even if the scanning lines have a multi-layer wiring structure, and a driving method thereof.

The liquid crystal display device according to the first aspect is connected to a switching element, a plurality of pixels having a liquid crystal capacitance connected to the switching element, and each switching element, and transmits a scanning signal for turning on the switching element. Multiple scanning lines, a plurality of signal lines connected to each switching element and transmitting a display signal applied to the liquid crystal capacitance via the switching element, and a signal for applying a display signal to each of the plurality of signal lines. It is equipped with a line drive circuit. The plurality of scanning lines have a multi-layer wiring structure. The signal line drive circuit applies a display signal to which a correction value different for each layer of the scanning line is added to the corresponding signal line.

The driving method of the liquid crystal display device according to the second aspect is a scanning for turning on a switching element, a plurality of pixels having a liquid crystal capacitance connected to the switching element, and being connected to each switching element. A plurality of scanning lines for transmitting signals, a plurality of signal lines connected to each switching element and transmitting a display signal applied to the liquid crystal capacitance via the switching element, and a plurality of signal lines for transmitting a display signal to each of the plurality of signal lines. A plurality of scanning lines including a signal line driving circuit to be applied are a driving method of a liquid crystal display device having a multi-layer wiring structure, and a correction value different for each layer of scanning lines is applied by the signal line driving circuit. It is provided to apply the added display signal to the corresponding signal line.

According to the embodiment, it is possible to provide a liquid crystal display device capable of suppressing deterioration of display quality even if the scanning lines have a multi-layer wiring structure, and a driving method thereof.

FIG. 1 is a layout diagram of a liquid crystal display device according to an embodiment. FIG. 2A is a sectional view taken along line 2A-2A of FIG. FIG. 2B is a sectional view taken along line 2B-2B of FIG. FIG. 3 is a block diagram of the liquid crystal display device. FIG. 4 is a diagram showing a pixel configuration. FIG. 5 is a diagram showing a signal waveform when the liquid crystal display device is driven. FIG. 6 is a diagram showing a driving method of the liquid crystal display device of the embodiment. FIG. 7A is a diagram showing the arrangement of the average value of the display electrode voltage for each pixel when the positive electrode is driven in the driving method of the liquid crystal display device of the embodiment. FIG. 7B is a diagram showing the arrangement of the average value of the display electrode voltage for each pixel when the negative electrode is driven in the driving method of the liquid crystal display device of the embodiment. FIG. 8 is a flowchart showing a method of calculating a correction value of a display signal. FIG. 9A is a diagram showing a measurement pattern of group a. FIG. 9B is a diagram showing a measurement pattern of group b. FIG. 10 is a diagram showing a driving method of the liquid crystal display device of the modified example.

Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a layout diagram of the liquid crystal display device 1 according to the embodiment. The liquid crystal display device 1 includes a pixel array 10 and a driver integrated circuit (IC) 11. Further, in FIG. 1, the X direction and the Y direction are defined. The X direction and the Y direction intersect. The X direction is, for example, the horizontal direction of the liquid crystal display device 1. The Y direction is, for example, the vertical direction of the liquid crystal display device 1.

The pixel array 10 is provided with a plurality of scanning lines GL, each extending in the X direction, and a plurality of signal lines SL, each extending in the Y direction. The scanning line GL is a wiring for transmitting a scanning signal. In FIG. 1, the scanning lines GL are numbered GL1, GL2, GL3, ..., In order from the top of FIG. As shown in FIG. 1, the odd-numbered scanning lines GL1, GL3, GL5, ... Are drawn from the left side of the pixel array 10. The even-numbered scanning lines GL2, GL4, GL6, ... Are drawn from the right side of the pixel array 10. The signal line SL is wiring for transmitting a display signal. In FIG. 1, the signal lines SL are numbered SL1, SL2, SL3, ..., In order from the left in FIG.

FIG. 2A is a sectional view taken along line 2A-2A of FIG. FIG. 2B is a sectional view taken along line 2B-2B of FIG. As shown in FIGS. 2A and 2B, the scanning line GL has a two-layer wiring structure. The M1 layer and the M2 layer on which the scanning lines GL are arranged are formed in this order on the glass substrate GS on which the pixel array 10 is formed. The M1 layer and the M2 layer are insulated by an interlayer insulating film. Then, as shown in FIG. 2A, the odd-numbered scanning lines GL1, GL3, GL5, ..., Are arranged in two layers. For example, the scanning lines GL1, GL5, GL9, ... Are arranged in the lower M1 layer. Further, the scanning lines GL3, GL7, GL11, ... Are arranged in the upper M2 layer. Similarly, as shown in FIG. 2B, the even-numbered scanning lines GL2, GL4, GL6, ... Are also arranged in two layers. For example, the scanning lines GL2, GL6, GL10, ... Are arranged in the lower M1 layer. Further, the scanning lines GL4, GL8, GL12, ... Are arranged in the upper M2 layer.

Here, as shown in FIGS. 2A and 2B, the wiring width of the scanning lines GL1, GL2, GL5, and GL6 formed in the M1 layer is the wiring of the scanning lines GL3, GL4, GL7, and GL8 formed in the M2 layer. It is shown wider than the width. This is because the scanning lines of the M1 layer are formed on the glass substrate GS, whereas the scanning lines of the M2 layer are formed on the M1 layer. Due to the difference in the conditions for forming the wiring, even if the same wiring material is used and the same width is tried to be formed, there is a difference in the workmanship such as the width of the wiring. 2A and 2B show the difference in workmanship during the formation of this wiring.

The driver IC 11 is arranged at a position below the pixel array 10. The driver IC 11 is connected to the scanning line GL and the signal line SL. The driver IC 11 may be composed of an IC chip.

FIG. 3 is a block diagram of the liquid crystal display device 1. As described above, the pixel array 10 is provided with a plurality of scanning lines GL1, GL2, ... Extending in the X direction, and a plurality of signal lines SL1, SL2, ... Extending in the Y direction. Pixels PX are arranged in the intersection region of the scanning line GL and the signal line SL.

FIG. 4 is a diagram showing the configuration of the pixel PX. One pixel PX has a liquid crystal capacity Clc, a switching element 101, and a storage capacity Cs.

The liquid crystal capacity Clc is composed of a display electrode DE, a common electrode CE, and a liquid crystal layer LC. The display electrode DE is a transparent electrode such as ITO, and is formed for each pixel PX on the above-mentioned glass substrate GS. The common electrode CE is formed on a glass substrate arranged so as to face the glass substrate GS, and is, for example, one transparent electrode facing each display electrode DE. The liquid crystal layer LC is a layer of liquid crystal sandwiched between the display electrode DE and the common electrode CE.

The switching element 101 is, for example, a thin film transistor (TFT). When the switching element 101 is a TFT, the source electrode S of the TFT is connected to the signal line SL, the gate electrode G is connected to the scanning line GL, and the drain electrode D is connected to the display electrode DE of the liquid crystal capacitance Clc.

The storage capacity Cs is connected in parallel to the liquid crystal capacity Clc. The storage capacity Cs has a function of suppressing the potential fluctuation generated in the display electrode DE and holding the voltage applied to the liquid crystal layer LC until the next display signal is applied. The storage capacity Cs is composed of a display electrode DE, a storage electrode (also referred to as a storage capacity line) AE, and an insulating film IL sandwiched between them.

The driver IC 11 includes a scanning line drive circuit 111, a signal line drive circuit 112, a common electrode drive circuit 113, a voltage generation circuit 114, and a control circuit 115.

The scan line drive circuit 111 is electrically connected to the scan line GL. The scanning line drive circuit 111 sends a scanning signal for turning on or off the switching element 101 included in the pixel PX to the pixel array 10 based on the control signal sent from the control circuit 115.

The signal line drive circuit 112 is electrically connected to the signal line SL. The signal line drive circuit 112 receives control signals and display data from the control circuit 115. The signal line drive circuit 112 sends a display signal corresponding to the display data to the pixel array 10 based on the control signal. The display signal is a voltage signal having a gradation level corresponding to the display data. The signal line drive circuit 112 of the embodiment includes a correction value memory 112a. The correction value memory 112a is a non-volatile memory such as a flash memory for storing a correction value for correcting a difference in feed-through voltage for each layer due to a difference in the performance of scanning lines having a multilayer wiring structure.

The common electrode drive circuit 113 is connected to the common electrode CE and the storage electrode AE. The common electrode drive circuit 113 generates a common voltage, and supplies this common voltage to the common electrode CE and the storage electrode AE in the pixel array 10.

The voltage generation circuit 114 transmits various voltages necessary for the operation of the liquid crystal display device 1, such as the voltage used in the scanning line drive circuit 111, the voltage used in the signal line drive circuit 112, and the voltage used in the common electrode drive circuit 113. Generate and supply these voltages to the corresponding circuit.

The control circuit 115 comprehensively controls the operation of the liquid crystal display device 1. The control circuit 115 receives the display data DT and the control signal CNT from the outside. The control circuit 115 generates various control signals based on the display data DT and the control signal CNT, and sends the generated control signals to the corresponding circuit.

Next, the operation of the liquid crystal display device 1 will be described. When the image is displayed on the liquid crystal display device 1, the display data DT and the control signal CNT are input to the control circuit 115. The display data DT is data representing the gradation level of each pixel constituting the image. The control circuit 115 generates a control signal from the control signal CNT. The generated control signals are, for example, a vertical sync signal and a horizontal sync signal. The control circuit 115 sends the vertical synchronization signal and the horizontal synchronization signal to the scanning line drive circuit 111 at predetermined timings, respectively. Further, the control circuit 115 sends the vertical synchronization signal and the horizontal synchronization signal to the signal line drive circuit 112 at predetermined timings. Further, the control circuit 115 sends the display data to the signal line drive circuit 112.

The scanning line drive circuit 111 sends a scanning signal that turns on the switching element 101 via the scanning line GL each time the horizontal synchronization signal is received. As a result, the switching element 101 is turned on one by one in the order of the scanning lines GL1, GL2, ... In synchronization with the horizontal synchronization signal.

The signal line drive circuit 112 decodes the display data and generates a display signal having an amplitude corresponding to the gradation level represented by the display data. Then, each time the signal line drive circuit 112 receives the horizontal synchronization signal, the signal line drive circuit 112 sends a display signal for one line via the signal line SL. When the switching element 101 is turned on, the display signal is applied to the display electrode DE of the corresponding pixel PX. As a result, a voltage corresponding to the difference between the display electrode voltage corresponding to the display signal and the common voltage applied to the common electrode CE is applied to the liquid crystal layer LC of the corresponding pixel PX. The liquid crystal has a characteristic that the transmittance changes according to the magnitude of the applied voltage. Therefore, for example, the light transmittance of the backlight arranged on the back surface of the glass substrate GS changes depending on the voltage applied to the liquid crystal capacity Clc. As a result, each pixel PX transmits light having a brightness corresponding to the gradation level. In this way, the image is displayed on the liquid crystal display device 1.

Further, a voltage having the same magnitude as that of the liquid crystal capacity Clc is applied to the storage capacity Cs. The storage capacity Cs suppresses the potential fluctuation that occurs in the display electrode DE, and the voltage applied to the liquid crystal layer LC is maintained until the next display signal is applied.

Here, the liquid crystal has a characteristic that it deteriorates when a DC voltage is continuously applied. Therefore, the signal line drive circuit 112 performs AC drive that inverts the polarity of the voltage applied to the liquid crystal layer LC, that is, the polarity of the display signal applied to the display electrode DE at regular intervals. This fixed interval is, for example, a one-frame interval that is an interval for receiving a vertical synchronization signal.

FIG. 5 is a diagram showing a signal waveform when the liquid crystal display device 1 is driven. FIG. 5 shows the scanning signal of the scanning lines GL1-GL5 and the display electrode voltage (during positive electrode drive and negative electrode drive) in order from the top. Further, in FIG. 5, it is assumed that a display signal corresponding to the same gradation level is applied to the pixel PX of each row.

In the AC drive, a feedthrough voltage is generated when the switching element 101 is turned off due to the parasitic capacitance between the gate electrode G and the display electrode DE of the switching element (TFT) 101 of the pixel PX shown in FIG. The feedthrough voltage causes a voltage drop in the display electrode voltage. When the off period is sufficiently longer than the on period of the switching element 101, the voltage obtained by subtracting the feedthrough voltage from the average value of the display electrode voltage becomes the substantial average value of the voltage applied to the liquid crystal layer LC. Due to the influence of such a feedthrough voltage, the absolute value of the average value of the voltage applied to the liquid crystal layer LC differs between the positive electrode drive and the negative electrode drive. That is, the voltage applied to the liquid crystal layer is lower than the original voltage when the positive electrode is driven, and the voltage applied to the liquid crystal layer is higher than the original voltage when the negative electrode is driven. The difference in voltage applied to the liquid crystal layer LC between when the positive electrode is driven and when the negative electrode is driven appears as flicker with a cycle of one frame. Here, if the feedthrough voltage is constant over all horizontal periods, the effect of the voltage drop due to the feedthrough voltage can be corrected by increasing the common voltage by the feedthrough voltage.

On the other hand, when the scanning signal is blunted due to the influence of the resistance and capacitance of the scanning line GL, the voltage at which the switching element 101 is turned off becomes higher than when the scanning signal is not blunted. Therefore, the feedthrough voltage becomes low. For example, as shown in FIGS. 2A and 2B, when the wiring width of the scanning lines GL3 and GL4 of the M2 layer is narrower than the wiring width of the scanning lines GL1, GL2 and GL5 of the M1 layer, the wiring of the scanning lines GL3 and GL4 The resistance is higher than the wiring resistance of the scanning lines GL1, GL2, and GL5. Therefore, as shown in FIG. 5, the scanning signals of the scanning lines GL3 and GL4 may be dull. Assuming that the scanning signals of the scanning lines GL3 and GL4 are dull, as shown in FIG. 5, the feedthrough voltage in the horizontal period corresponding to the scanning lines GL3 and GL4 corresponds to the scanning lines GL1, 2 and GL5. It will be lower than the feedthrough voltage during the horizontal period. As a result, the average value of the voltage applied to the liquid crystal layer LC in the horizontal period corresponding to the scanning lines GL3 and GL4 becomes higher than in the other horizontal periods. The difference in the voltage applied to the liquid crystal layer LC appears as a horizontal streak during display within one frame period. Further, the difference in the voltage applied to the liquid crystal layer LC between the positive electrode drive and the negative electrode drive appears as a flicker with a one-frame cycle, as in the case where the scanning signal is not dull. However, the magnitude of the feedthrough voltage differs between the horizontal period corresponding to the scanning lines GL1, GL2, and GL5 and the horizontal period corresponding to the scanning lines GL3 and GL4. Therefore, for example, even if the common voltage is increased according to the feedthrough voltage in the horizontal period corresponding to the scanning lines GL1, GL2, and GL5, the flicker in the horizontal period corresponding to the scanning lines GL3 and GL4 is not suppressed.

FIG. 6 is a diagram showing a driving method of the liquid crystal display device of the embodiment. In the embodiment, the difference in the feedthrough voltage for each layer due to the difference in the performance of each layer of the scanning line GL having the multilayer wiring structure is corrected for each layer of the scanning line GL. Specifically, the signal line drive circuit 112 adds a correction value to the display signal corresponding to the gradation level applied to the display electrode DE every two horizontal periods. “A” in FIG. 6 is an average value of the display electrode voltage of the group a, which is a group of pixels PIX connected to the scanning line GL of the M1 layer. Further, "b" in FIG. 6 is an average value of group b, which is a group of pixels PIX connected to the scanning line GL of the M2 layer. In group b, the average value of the display electrode voltage is reduced by the difference of the feedthrough voltage for each layer by further adding the correction value to the display signal to be originally applied. In this state, a feedthrough voltage of a different magnitude is subtracted from the average value of the display electrode voltage of group a and the average value of the display electrode voltage of group b, so that a display signal corresponding to the same gradation level is applied. At this time, the average value of the voltage applied to the liquid crystal layer LC becomes constant regardless of the layer of the scanning line GL.

7A and 7B are diagrams showing the arrangement of the average value of the display electrode voltage for each pixel PIX in the driving method of the liquid crystal display device of the embodiment. FIG. 7A shows the arrangement of the average value of the display electrode voltage when the positive electrode is driven, and FIG. 7B shows the arrangement of the average value of the display electrode voltage when the negative electrode is driven. “A” in FIGS. 7A and 7B means that it is the average value of group a, which is a group of pixels PIX connected to the scanning line GL of the M1 layer. “B” means that it is the average value of group b, which is a group of pixels PIX connected to the scanning line GL of the M2 layer. As shown in FIGS. 7A and 7B, every two rows form the same group.

FIG. 8 is a flowchart showing a method of calculating a correction value of a display signal. The correction value of the display signal can be obtained by measuring the difference between the average values of the display electrode voltages of the a group and the b group. The process of FIG. 8 may be performed, for example, at the time of manufacturing the liquid crystal display device 1.

In step S1, the operator starts the display of the measurement pattern of the a group by the liquid crystal display device 1. FIG. 9A is a diagram showing a measurement pattern of group a. As shown in FIG. 9Aa, in the measurement pattern of group a, the pixel PIX belonging to group a is turned on and the pixel PIX belonging to group b is turned off. It is assumed that the display data of the pixel PIX in the lit state is display data representing the same intermediate gradation level. Further, it is assumed that the display signal applied to the pixel PIX in the non-lighting state is display data representing the same black level. The non-lighting condition is used to eliminate the effects of different groups. The display data representing the intermediate gradation level is used as the lighting state because the intermediate gradation level has a characteristic that the transmittance is changed by a change in a smaller potential than the minimum gradation level and the maximum gradation level. This is because it has. Of course, display data other than the intermediate gradation level may be used as the lighting state.

In step S2, the operator operates the common voltage generated by the common electrode drive circuit 113 so that the flicker is minimized while observing the display of the liquid crystal display device 1. As described above, when the common voltage is not operated, the difference in the voltage applied to the liquid crystal layer between the positive electrode drive and the negative electrode drive appears as flicker. The operator operates a common voltage so that this flicker disappears. The value of the common voltage operated in step S2 is input to, for example, a personal computer as the value of the common voltage of the group a. The operation of the common voltage may be performed automatically. That is, the common electrode drive circuit 113 may operate the common voltage so that the flicker of the pixel PIX of the group a between the positive electrode drive and the negative electrode drive is minimized.

In step S3, the operator starts the display of the measurement pattern of the b group by the liquid crystal display device 1. FIG. 9B is a diagram showing a measurement pattern of group b. As shown in FIG. 9B, in the measurement pattern of group b, the pixel PIX belonging to group a is turned off and the pixel PIX belonging to group b is turned on. The gradation level in the lighting state and the non-lighting state is the same as the measurement pattern of group a.

In step S4, the operator operates the common voltage generated by the common electrode drive circuit 113 so that the flicker is minimized while observing the display of the liquid crystal display device 1. The value of the common voltage operated in step S4 is input to, for example, a personal computer as the value of the common voltage of the group b. The operation of the common voltage may be performed automatically. That is, the common electrode drive circuit 113 may operate the common voltage so that the flicker of the pixel PIX of the group b between the positive electrode drive and the negative electrode drive is minimized.

In step S5, the personal computer calculates the difference between the common voltage of the group a and the common voltage of the group b. If the feedthrough voltage is the same in the group a and the group b, the value of the common voltage at which the flicker disappears becomes the same. That is, the difference between the common voltage of the group a and the common voltage of the group b becomes the difference between the feedthrough voltage of the group a and the feedthrough voltage of the group b as it is. Then, the personal computer stores the difference value of the common voltage, that is, the difference value of the feedthrough voltage in the correction value memory 112a of the liquid crystal display device 1 as the correction value. After that, the process of FIG. 8 ends.

After the processing of FIG. 8, the signal line drive circuit 112 adds a correction value to the display signal corresponding to the original gradation level applied to the display electrode DE when displaying the pixels corresponding to the group b. The average value of the display electrode voltage in the group b is made lower than the average value of the display electrode voltage in the group a by the difference in the feed-through voltage for each group of the scanning line layers.

As described above, according to the embodiment, the influence of the difference in feedthrough voltage due to the difference in the performance of each layer of the scanning line having the multilayer wiring structure is the average value of the display electrode voltage for each group of the layers of the scanning line. It is corrected by the control of. As a result, even if the scanning line has a multi-layer wiring structure, deterioration of display quality is suppressed.

[Modification example]
A modification of the embodiment will be described. In the above-described embodiment, the influence of the difference in feedthrough voltage due to the difference in performance between layers of the scanning line having the multilayer wiring structure is corrected by controlling the average value of the display electrode voltage for each group. On the other hand, when the difference in brightness between groups due to the influence of the difference in feedthrough voltage due to the difference in the performance of each layer of the scanning line having a multi-layer wiring structure is remarkable and a large horizontal streak or the like occurs, FIG. The brightness may be corrected by the display electrode voltage itself as described above. In this case, the measurement patterns shown in FIGS. 9A and 9B can be used for measuring the luminance. For example, it is displayed by the measurement pattern of FIG. 9A and the brightness of each pixel of the group a is measured, and is displayed by the measurement pattern of FIG. 9B and the brightness of each pixel of the group b is measured. Then, the amplitude value of the display signal of the b group in which the difference between the brightness of each pixel of the group a and the brightness of each pixel of the group b becomes zero is obtained, and the amplitude value of this display signal is the correction value as the correction value. It is stored in the memory 112a. When displaying the pixels corresponding to the group b, the signal line drive circuit 112 adds a correction value to the display signal corresponding to the original gradation level applied to the display electrode DE, so that the display electrode voltage in the group b is displayed. Is changed by the difference of the feed-through voltage rather than the display electrode voltage in the group a. In this way, even if the scanning line has a multi-layer wiring structure, deterioration of display quality is suppressed.

Further, in the embodiment, the scanning line has a two-layer structure. The scanning line may have a multi-layer structure of three or more layers. In this case as well, the scanning lines are grouped by layer. Then, the correction value is stored in the correction value memory 112a for each group.

The present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent elements are deleted can be extracted as an invention.

1 ... liquid crystal display device, 10 ... pixel array, 101 ... switching element, Clc ... liquid crystal capacity, DE ... display electrode, CE ... common electrode, GL ... scanning line, SL ... signal line, 111 ... scanning line drive circuit, 112 ... Signal line drive circuit, 112a ... Correction value memory, 113 ... Common electrode drive circuit, 114 ... Voltage generation circuit, 115 ... Control circuit.

Claims (5)

A plurality of pixels having a switching element and a liquid crystal capacity connected to the switching element, and
A plurality of scanning lines connected to each of the switching elements and transmitting a scanning signal for turning on the switching element.
A plurality of signal lines connected to each of the switching elements and transmitting a display signal applied to the liquid crystal capacitance via the switching element, and a plurality of signal lines.
A signal line drive circuit that applies the display signal to each of the plurality of signal lines,
Equipped with
The plurality of scanning lines have a multi-layer wiring structure and have a multi-layer wiring structure.
The signal line drive circuit is a liquid crystal display device that applies the display signal to which a correction value different for each layer of the scanning line is applied to the corresponding signal line. The signal line drive circuit inverts the polarity of the display signal at regular intervals, and the signal line drive circuit reverses the polarity of the display signal at regular intervals.
The correction value is calculated based on the average value of the display signals applied to the liquid crystal capacity at regular intervals.
The liquid crystal display device according to claim 1. The signal line drive circuit inverts the polarity of the display signal at regular intervals, and the signal line drive circuit reverses the polarity of the display signal at regular intervals.
The correction value is calculated based on the amplitude of the display signal applied to the liquid crystal capacity at regular intervals.
The liquid crystal display device according to claim 1. The liquid crystal display device according to any one of claims 1 to 3, wherein the correction value is a correction value corresponding to a difference in feedthrough voltage for each layer of the scanning line. A plurality of pixels having a switching element and a liquid crystal capacitance connected to the switching element, and a plurality of scanning lines connected to each of the switching elements and transmitting a scanning signal for turning on the switching element, respectively. A plurality of signal lines connected to the switching element and transmitting a display signal applied to the liquid crystal capacitance via the switching element, and a signal line drive circuit for applying the display signal to each of the plurality of signal lines. The plurality of scanning lines are a method for driving a liquid crystal display device having a multi-layer wiring structure.
A method for driving a liquid crystal display device, comprising applying the display signal to which a correction value different for each layer of the scanning line is added to the corresponding signal line by the signal line driving circuit.

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