TWI813047B - Liquid crystal display device and driving method thereof - Google Patents

Abstract

A liquid crystal display device is provided with: a plurality of pixels with switching elements and liquid crystal capacitors connected to the switching elements; a plurality of scanning lines connected to each switching element and transmitting scanning signals for turning on the switching elements; a plurality of signal lines, It is connected to each switching element and transmits the display signal applied to the liquid crystal capacitor through the switching element; and the signal line driving circuit applies the display signal to each of the plurality of signal lines. A plurality of scan lines and a multi-layer wiring structure. The signal line driving circuit applies display signals with different correction values added to the layers of each scanning line to the corresponding signal lines.

Description

Liquid crystal display device and driving method thereof

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

There is known an active matrix type liquid crystal display device that uses thin film transistors (TFTs) as active elements. A liquid crystal display device has display electrodes, common electrodes and pixels. The pixels include a liquid crystal layer sandwiched between a display electrode and a common electrode. In a liquid crystal display device, by controlling the magnitude of the voltage applied to the display electrode through the TFT, the display gradation can be changed.

Here, if a DC voltage is continuously applied to the liquid crystal used in the liquid crystal display device, deterioration will occur. Therefore, the liquid crystal display device is driven by AC drive that inverts the polarity of the voltage applied to the liquid crystal layer at fixed intervals, for example, every frame. In the case of AC driving, the TFT generates a feed through voltage when it switches from ON to OFF. The voltage applied to the display electrodes is reduced by the feedthrough voltage. Therefore, in order to perform display at an appropriate gradation level, the voltage drop caused by the feedthrough voltage needs to be corrected. In the past, the voltage drop caused by the feed-through voltage was corrected by increasing the common voltage applied to the common electrode by an amount equivalent to the voltage drop of the feed-through voltage.

In addition, in recent years, there has been a further demand for a narrower frame of a display panel of a liquid crystal display device. As a method of narrowing the frame of a display panel, a method is known in which scanning lines for driving TFTs are formed into a multi-layer wiring structure. In the case of a multi-layer wiring structure, even if the same wiring material is used, the degree of completion such as the width of the wiring will vary depending on the conditions under which the wiring is formed. Changes in scan line width, etc. are closely related to changes in feedthrough voltage. That is, in a multi-layer wiring structure, the feedthrough voltage may vary for each layer. Due to the different feedthrough voltages in each layer, the display quality will be reduced, that is, horizontal stripes will be generated during display, or flickering will occur.

[Problem to be solved by the invention]

In the case where the feedthrough voltage is different for each layer, the voltage drop caused by the feedthrough voltage cannot be corrected by changing the common voltage.

This embodiment provides a liquid crystal display device and a driving method thereof that can suppress degradation in display quality even when the scanning lines have a multilayer wiring structure.

A liquid crystal display device of a first aspect, which includes: a plurality of pixels with switching elements and liquid crystal capacitors connected to the switching elements; a plurality of scanning lines connected to each switching element and transmitting scanning signals for turning on the switching elements. ; A plurality of signal lines, connected to each switching element, and transmitting a display signal applied to the liquid crystal capacitor through the switching element; and a signal line driving circuit, applying a display signal to each of the plurality of signal lines. A plurality of scan lines and a multi-layer wiring structure. The signal line driving circuit applies display signals with different correction values added to the layers of each scanning line to the corresponding signal lines.

The driving method of the liquid crystal display device of the second aspect includes: a switching element; a plurality of pixels having liquid crystal capacitors connected to the switching element; and a plurality of scanning lines connected to each switching element and transmitting signals for turning on the switching element. scanning signal; a plurality of signal lines connected to each switching element and transmitting a display signal applied to the liquid crystal capacitor through the switching element; and a signal line driving circuit applying a display signal to each signal line of the plurality of signal lines; and The scanning lines have a multi-layer wiring structure. The driving method of the liquid crystal display device includes: using a signal line driving circuit to apply display signals with different correction values added to the layers of each scanning line to the corresponding signal lines. [Effects of the invention]

According to the embodiment, it is possible to provide a liquid crystal display device and a driving method thereof that can suppress deterioration in display quality even if the scanning lines have a multilayer wiring structure.

[Form used to implement the invention]

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 . In addition, in FIG. 1 , the X direction and the Y direction are defined. The X direction intersects the Y direction. 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 scan lines GL extending in the X direction and a plurality of signal lines SL extending in the Y direction. The scanning line GL is a wiring for transmitting scanning signals. In FIG. 1 , the scan lines GL are numbered GL1, GL2, GL3, . . . in sequence from the top of FIG. 1 . As shown in FIG. 1 , the odd-numbered scan lines GL1 , GL3 , GL5 , . . . are detoured from the left side of the pixel array 10 . The even-numbered scan lines GL2, GL4, GL6, ... are detoured from the right side of the pixel array 10. The signal line SL is a wiring used to transmit display signals. In FIG. 1 , the signal lines SL are numbered SL1, SL2, SL3, . . . in sequence from the left side of FIG. 1 .

FIG. 2A is a cross-sectional view along line 2A-2A in FIG. 1 . FIG. 2B is a cross-sectional view along line 2B-2B in FIG. 1 . As shown in FIGS. 2A and 2B , the scan line GL has a two-layer wiring structure. On the glass substrate GS on which the pixel array 10 is formed, the M1 layer and the M2 layer configured with the scan lines GL are sequentially formed. The M1 layer and the M2 layer are insulated by an interlayer insulating film. Furthermore, as shown in FIG. 2A , the odd-numbered scanning lines GL1, GL3, GL5, ... are divided into two layers and arranged. For example, the scan lines GL1, GL5, GL9, ... are arranged in the lower layer, that is, the M1 layer. In addition, the scanning lines GL3, GL7, GL11, ... are arranged in the upper layer, that is, the M2 layer. Similarly, as shown in FIG. 2B , the even-numbered scanning lines GL2, GL4, GL6, ... are also divided into two layers and arranged. For example, the scan lines GL2, GL6, GL10, ... are arranged in the lower layer, that is, the M1 layer. In addition, the scanning lines GL4, GL8, GL12, ... are arranged in the upper layer, that is, the M2 layer.

Here, as shown in FIGS. 2A and 2B , the wiring widths of the scanning lines GL1, GL2, GL5, and GL6 formed in the M1 layer are shown to be larger than the wiring widths of the scanning lines GL3, GL4, GL7, and GL8 formed in the M2 layer. The wiring width is still wide. This is because the scanning lines of the M1 layer are formed on the glass substrate GS, and the scanning lines of the M2-th layer are formed on the M1 layer. Due to different conditions for forming wiring, even if the same wiring material is used and the wiring is formed to have the same width, there will still be a difference in the degree of completion such as the width of the wiring. In FIGS. 2A and 2B , the difference in the degree of completion when the wiring is formed is shown.

The driver IC 11 is disposed on the lower side of the pixel array 10 . The driver IC 11 is connected to the scanning line GL and the signal line SL. The driver IC 11 can be composed of an IC chip.

FIG. 3 is a block diagram of the liquid crystal display device 1 . As mentioned 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. The pixel PX is arranged in the intersection area of the scanning line GL and the signal line SL.

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

The liquid crystal capacitor 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 on the aforementioned glass substrate GS for each pixel PX. The common electrode CE is formed on a glass substrate arranged to face the glass substrate GS, and is, for example, one transparent electrode facing each of the display electrodes 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 scan line GL, and the drain electrode D is connected to the display electrode DE of the liquid crystal capacitor Clc.

The storage capacitor Cs is connected in parallel with the liquid crystal capacitor Clc. The storage capacitor Cs has the function of suppressing the potential variation occurring in the display electrode DE and maintaining the voltage applied to the liquid crystal layer LC until the next display signal is applied. The storage capacitor Cs is composed of a display electrode DE, a storage electrode (also called a storage capacitor line) AE, and an insulating film IL sandwiched between them.

The driving IC 11 has a scanning line driving circuit 111, a signal line driving circuit 112, a common electrode driving circuit 113, a voltage generating circuit 114, and a control circuit 115.

The scan line driving circuit 111 is electrically connected to the scan line GL. The scanning line driving circuit 111 transmits the scanning signal included in the pixel PX to turn on (ON) or turn off (OFF) the switching element 101 to the pixel array 10 according to the control signal transmitted from the control circuit 115 .

The signal line driving circuit 112 is electrically connected to the signal line SL. The signal line driving circuit 112 receives control signals and display data from the control circuit 115 . The signal line driving circuit 112 transmits the display signal corresponding to the display data to the pixel array 10 according to the control signal. The display signal is a voltage signal with a gradation level corresponding to the display data. The signal line driving 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 the difference in completion level of each layer caused by the difference in completion level of the scanning line having a multi-layer wiring structure. Difference in feedthrough voltage.

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

The voltage generating circuit 114 generates a voltage used in the scanning line driving circuit 111, a voltage used in the signal line driving circuit 112, and a voltage used in the common electrode driving circuit 113, which are used in the operation of the liquid crystal display device 1. Various voltages are required, and these voltages are supplied to the corresponding circuits.

The control circuit 115 systematically controls the operation of the liquid crystal display device 1 . The control circuit 115 receives display data DT and 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 transmits the generated control signals to the corresponding circuits.

Next, the operation of the liquid crystal display device 1 will be described. When the liquid crystal display device 1 displays an image, the display data DT and the control signal CNT are input to the control circuit 115 . The display data DT is data indicating 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, vertical synchronization signals and horizontal synchronization signals. The control circuit 115 transmits the vertical synchronization signal and the horizontal synchronization signal to the scan line driving circuit 111 at each predetermined time. In addition, the control circuit 115 transmits the vertical synchronization signal and the horizontal synchronization signal to the signal line driving circuit 112 at each predetermined time. Furthermore, the control circuit 115 transmits the display data to the signal line driving circuit 112 .

The scanning line driving circuit 111 transmits a scanning signal for turning on the switching element 101 via the scanning line GL every time it receives a horizontal synchronization signal. Thereby, in synchronization with the horizontal synchronization signal, the switching elements 101 are turned on column by column in the order of the scanning lines GL1, GL2, ....

The signal line driving circuit 112 decodes the display data and generates a display signal having an amplitude corresponding to the gradation level displayed by the display data. Then, the signal line driving circuit 112 transmits a display signal for one column via the signal line SL every time it receives the horizontal synchronization signal. When the switching element 101 is turned on, the display signal is applied to the display electrode DE of the corresponding pixel PX. Thereby, 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 can be applied to the liquid crystal layer LC of the corresponding pixel PX. Liquid crystals have the characteristic that their transmittance changes depending on the magnitude of the applied voltage. Therefore, for example, the light transmittance of the backlight disposed on the back surface of the glass substrate GS changes according to the voltage applied to the liquid crystal capacitor Clc. Therefore, each pixel PX transmits light with brightness corresponding to the gradation level. In this way, image display is performed on the liquid crystal display device 1 .

In addition, a voltage with the same magnitude as the liquid crystal capacitor Clc is applied to the storage capacitor Cs. The storage capacitor Cs suppresses the potential variation occurring in the display electrode DE and maintains the voltage applied to the liquid crystal layer LC until the next display signal is applied.

Here, liquid crystal has characteristics that deteriorate if a DC voltage is continuously applied. Therefore, the signal line driving circuit 112 performs AC driving 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. The fixed interval is, for example, an interval for receiving vertical synchronization signals, that is, one frame interval.

FIG. 5 is a diagram showing signal waveforms when the liquid crystal display device 1 is driven. FIG. 5 shows the scanning signals and display electrode voltages of the display scanning lines GL1 to GL5 in order from the top (when driven by the positive electrode and when driven by the negative electrode). In addition, in FIG. 5 , it is assumed that display signals corresponding to the same gradation level are applied to the pixels PX in each column.

In AC driving, 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. 4 generates a feedthrough voltage when the switching element 101 is turned off. By feeding through the voltage, a voltage drop occurs in the display electrode voltage. When the off period of the switching element 101 is much longer than the on period, the voltage obtained by subtracting the feedthrough voltage from the average value of the display electrode voltages becomes the average value of the voltages actually applied to the liquid crystal layer LC. Due to the influence of such feed-through voltage, a difference will occur in the absolute value of the average value of the voltage applied to the liquid crystal layer LC during positive driving and negative driving. That is, the voltage applied to the liquid crystal layer during positive electrode driving is lower than the original voltage, and the voltage applied to the liquid crystal layer during negative electrode driving is higher than the original voltage. The difference in voltage applied to the liquid crystal layer LC during positive driving and negative driving causes flickering of one frame period. Here, if the feed-through voltage is fixed during all levels, the influence of the voltage drop caused by the feed-through voltage can be corrected by increasing the common voltage by the amount of the feed-through voltage in advance.

On the contrary, when the scanning signal has rounding distortion due to the influence of the resistance and capacitance of the scanning line GL, the voltage after turning off the switching element 101 is higher than the case where the scanning signal does not have rounding distortion. Therefore, the feedthrough voltage decreases. 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 smaller than the wiring width of the scanning lines GL1, GL2 and GL5 of the M1 layer, the wiring resistance of the scanning lines GL3 and GL4 is high. Wiring resistance for scan lines GL1, GL2, and GL5. Therefore, as shown in FIG. 5 , circular distortion may occur in the scanning signals of scanning lines GL3 and GL4. Assuming that circular distortion occurs in the scanning signals of scanning lines GL3 and GL4, as shown in Figure 5, the feedthrough voltage in the horizontal period corresponding to scanning lines GL3 and GL4 is lower than the horizontal period corresponding to scanning lines GL1, GL2 and GL5. feedthrough voltage. As a result, the average value of the voltage applied to the liquid crystal layer LC in the horizontal periods corresponding to the scanning lines GL3 and GL4 will be higher than that in other horizontal periods. Differences in voltage applied to the liquid crystal layer LC appear as lateral stripes during display during one frame. In addition, just like when the scanning signal has no circular distortion, the difference in voltage applied to the liquid crystal layer LC during positive driving and negative driving appears as a flicker within one frame period. However, in the horizontal period corresponding to the scanning lines GL1, GL2, and GL5 and the horizontal period corresponding to the scanning lines GL3 and GL4, the magnitude of the feedthrough voltage is different. Therefore, for example, even if the common voltage is increased in conjunction with the feedthrough voltage in the horizontal periods corresponding to the scanning lines GL1, GL2, and GL5, flicker in the horizontal periods corresponding to the scanning lines GL3 and GL4 cannot be suppressed.

FIG. 6 is a diagram showing a driving method of the liquid crystal display device according to the embodiment. In the embodiment, the difference in the feedthrough voltage of each layer caused by the difference in completion level of the layers of each scanning line GL having a multi-layer wiring structure is corrected in units of layer groups of each scanning line GL. Specifically, the signal line driving 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 the average value of the display electrode voltage of the group a of the pixels PX connected to the scanning line GL of the M1 layer. In addition, "b" in FIG. 6 is the average value of the group b of the pixels PX connected to the scanning line GL of the M2 layer. In group b, by further adding a correction value to the originally applied display signal, the average value of the display electrode voltage is reduced by the difference in the feedthrough voltage of each layer. In this state, by subtracting feedthrough voltages of different sizes from the average value of the display electrode voltages of group a and the average value of the display electrode voltages of group b, when a display corresponding to the same step level is applied When the signal is generated, the average value of the voltage applied to the liquid crystal layer LC is fixed 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 PX in the driving method of the liquid crystal display device according to the embodiment. FIG. 7A shows the arrangement of the average value of the display electrode voltage when driven in the positive electrode, and FIG. 7B shows the arrangement of the average value of the display electrode voltage in the case of negative electrode driving. "a" in FIGS. 7A and 7B means a group of pixels PX connected to the scanning line GL of the M1 layer, that is, the average value of the group a. "b" means the average value of the group b of the pixels PX connected to the scanning line GL of the M2 layer. As shown in FIGS. 7A and 7B , every two columns 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 group a and group b. The process of FIG. 8 can be implemented, for example, when manufacturing the liquid crystal display device 1 .

In step S1, the operator starts displaying the measurement pattern of group a through the liquid crystal display device 1. FIG. 9A is a diagram showing a measurement pattern of group a. As shown in FIG. 9A , in the measurement mode of group a, the pixel PX belonging to group a is set to the lit state, and the pixel PX belonging to group b is set to the unlit state. It is assumed that the display data of the pixel PX set to the lighted state displays the same intermediate gradation level. In addition, it is assumed that the display signal applied to the pixel PX in the unlit state displays display data with the same black level. The unlit state is used to exclude the influence of different groups. The reason why the lighting state uses the display data showing the intermediate level is because the liquid crystal has the following characteristics, that is, compared with the lowest level and the maximum level, the intermediate level is Small changes in potential cause changes in transmittance. Of course, as the lighting state, display data other than the intermediate gradation level can also be used.

In step S2, while observing the display of the liquid crystal display device 1, the operator operates the common voltage generated by the common electrode driving circuit 113 in a manner that minimizes flicker. As mentioned above, when the common voltage is not operated, the difference in voltage applied to the liquid crystal layer during positive driving and negative driving causes flickering. The operator operates the common voltage in such a way that the flicker cannot be seen. 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 group a. Furthermore, common voltage operation can also be performed automatically. That is, the common electrode driving circuit 113 may operate the common voltage so that the flicker of the pixel PX of group a is minimized between the positive electrode driving time and the negative electrode driving time.

In step S3, the operator starts displaying the measurement pattern of group b through the liquid crystal display device 1. FIG. 9B is a diagram showing the measurement pattern of group b. As shown in FIG. 9B , in the measurement mode of group b, it is assumed that the pixel PX belonging to group a is set to the unlit state, and the pixel PX belonging to group b is set to the lit state. 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, while observing the display of the liquid crystal display device 1, the operator operates the common voltage generated by the common electrode driving circuit 113 so that the flicker is minimized. The value of the common voltage operated in step S4 is input into, for example, a personal computer as the value of the common voltage of group b. Furthermore, common voltage operation can also be performed automatically. That is, the common electrode driving circuit 113 can also operate the common voltage in such a manner that the flicker of the pixel PX of group b is minimized between the positive electrode driving period and the negative electrode driving period.

In step S5, the personal computer calculates the difference between the common voltage of group a and the common voltage of group b. If the feedthrough voltages in group a and group b are the same, the values of the common voltages that cause no visible flicker are the same. That is, the difference between the common voltage of group a and the common voltage of group b directly becomes the difference between the feed-through voltage of group a and the feed-through voltage of group b. Then, the personal computer causes the correction value memory 112a of the liquid crystal display device 1 to store the difference in the common voltage, that is, the value of the difference in the feed-through voltage as a correction value in the correction value memory 112a. Then, the process of FIG. 8 ends.

After the processing in FIG. 8 , when displaying the pixels corresponding to group b, the signal line driving circuit 112 adds a correction value to the display signal corresponding to the original gradation level applied to the display electrode DE. The average value of the display electrode voltages of group b is compared to the average value of the display electrode voltages of group a, thereby reducing the difference in the feedthrough voltage of each group of layers of scan lines.

As described above, according to the embodiment, the feedthrough voltage caused by the difference in completion level of each scanning line layer in a multi-layer wiring structure can be corrected by controlling the average value of the display electrode voltage of each group of scanning line layers. The impact of the difference. Thereby, even if the scanning line has a multi-layer wiring structure, degradation of display quality can be suppressed. [Modification]

Modifications of the embodiment will be described. In the aforementioned embodiment, by controlling the average value of the display electrode voltages of each group, the influence of the difference in the feedthrough voltage caused by the difference in the completion degree of the layers of each scanning line having a multi-layer wiring structure is corrected. On the other hand, when the brightness difference of each group is obvious due to the influence of the difference in feed-through voltage caused by the difference in the degree of completion of each scan line layer in a multi-layer wiring structure, and large lateral stripes are generated, it can also be used. As shown in Figure 10, the brightness is corrected by displaying the electrode voltage itself. In this case, when measuring the brightness, the measurement mode shown in FIG. 9A and FIG. 9B can be used. For example, the display is performed in the measurement mode of FIG. 9A and the brightness of each pixel of group a is measured. In addition, the display is performed in the measurement mode of FIG. 9B and the brightness of each pixel of group b is measured. Then, the amplitude value of the display signal of group b is found where the difference between the brightness of each pixel of group a and the brightness of each pixel of group b becomes zero, and the amplitude value of the display signal is stored in the correction value memory as a correction value. 112a. When displaying the pixels corresponding to the group b, the signal line driving circuit 112 adds a correction value to the display signal corresponding to the original gradation level applied to the display electrode DE, thereby changing the display electrode voltage in the group b. Change the difference in feedthrough voltage compared to the display electrode voltage in group a. In this way, even if the scanning line has a multi-layer wiring structure, degradation of display quality can be suppressed.

In addition, 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, the layers are also grouped per scan line. Furthermore, the correction value is stored in the correction value memory 112a for each group.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the essential contents at the implementation stage. In addition, each embodiment can also be combined and implemented as appropriate, and in this case, a combined effect can be obtained. Furthermore, the above-mentioned embodiments include various inventions, and various inventions can be extracted by combinations selected from the plurality of disclosed constituent elements. For example, the problem can be solved even by deleting some constituent elements from all the constituent elements shown in the embodiments, and if the effect can be obtained, the constitution with the deleted constituent elements can be extracted as the invention.

1: Liquid crystal display device 10: Pixel array 11: Driver integrated circuit (IC) 101:Switching element 111:Scan line driver circuit 112: Signal line driver circuit 112a: Correction value memory 113: Common electrode drive circuit 114: Voltage generation circuit 115:Control circuit AE: Accumulation electrode Clc: liquid crystal capacitor CE: common electrode CNT: control signal Cs: storage capacitance DE: display electrode DT: display data GL: scan line GS: glass substrate IL: insulating film LC: liquid crystal layer M1, M2: layer PX: pixel SL: signal line

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

10: Pixel array

111:Scan line driver circuit

112: Signal line driver circuit

112a: Correction value memory

113: Common electrode drive circuit

114: Voltage generation circuit

115:Control circuit

CNT: control signal

DT: display data

GL1, GL2: scan line

PX: pixel

SL1, SL2: signal line

Claims (5)

A liquid crystal display device, which is provided with: a plurality of pixels with switching elements and liquid crystal capacitors connected to the switching elements; a plurality of scanning lines connected to each of the switching elements and transmitting scanning signals for turning on the switching elements; A plurality of signal lines, connected to each of the aforementioned switching elements, and transmitting a display signal applied to the aforementioned liquid crystal capacitor through the aforementioned switching element; and a signal line drive circuit, applying the aforementioned display signal to each of the plurality of aforementioned signal lines; The scan line has a multi-layer wiring structure; the signal line driving circuit applies the display signal with different correction values added to each layer of the scan line to the corresponding signal line. Such as the liquid crystal display device of claim 1, wherein the aforementioned signal line driving circuit inverts the polarity of the aforementioned display signal at regular intervals, and the aforementioned correction value is based on the average value of the aforementioned display signal applied to the aforementioned liquid crystal capacitor at regular intervals. calculated. The liquid crystal display device of claim 1, wherein the signal line driving circuit inverts the polarity of the display signal at regular intervals, and the correction value is determined based on the amplitude of the display signal applied to the liquid crystal capacitor at regular intervals. Calculate. The liquid crystal display device of any one of claims 1 to 3, wherein the correction value is a correction value corresponding to a difference in feedthrough voltage of each layer of the scanning line. A driving method of a liquid crystal display device, the liquid crystal display device is provided with: a plurality of pixels with switching elements and liquid crystal capacitors connected to the switching elements; a plurality of scanning lines connected to each of the switching elements and transmitting signals to turn on the switches a scanning signal of the element; a plurality of signal lines, connected to each of the aforementioned switching elements, and transmitting a display signal applied to the aforementioned liquid crystal capacitor through the aforementioned switching element; and a signal line drive circuit, applying to each of the plurality of aforementioned signal lines The aforementioned display signal; and the plurality of aforementioned scanning lines have a multi-layer wiring structure, the driving method of the liquid crystal display device includes: through the aforementioned signal line driving circuit, applying the aforementioned display signal to which a different correction value is added to each layer of the aforementioned scanning line Corresponding to the aforementioned signal line.