WO2011099218A1

WO2011099218A1 - Active matrix substrate, liquid crystal panel, liquid crystal display device, and television receiver

Info

Publication number: WO2011099218A1
Application number: PCT/JP2010/072010
Authority: WO
Inventors: 齊藤　裕一
Original assignee: シャープ株式会社
Priority date: 2010-02-15
Filing date: 2010-12-08
Publication date: 2011-08-18

Abstract

Disclosed is an active matrix substrate which is provided with: a data signal line; a scanning signal line (GLi); a transistor connected to the data signal line and the scanning signal line (GLi); and retention capacity wiring (CSLi) which forms a retention capacity with a pixel electrode included in a pixel. Retention capacity wiring signals (CS signals) for driving the retention capacity wiring (CSLi) are supplied to the retention capacity wiring (CSLi) from both the end portions of the retention capacity wiring. Thus, display qualities of a liquid crystal display device are improved.

Description

Active matrix substrate, liquid crystal panel, liquid crystal display device, television receiver

The present invention relates to an active matrix substrate having a storage capacitor wiring and a liquid crystal display device using the same.

Conventionally, in a liquid crystal display device, after a data signal is written to a pixel electrode, a storage capacitor wiring signal (CS signal) is supplied to the storage capacitor wiring (CS line) to raise or lower the pixel electrode potential (pixel potential). The technique which performs is proposed (for example, refer patent document 1).

FIG. 51 is a plan view schematically showing the form of the display device 1000 of Patent Document 1. FIG. In this display device 1000, the sustain signal generation circuits (retention capacitor line drive circuits) 700a and 700b set the voltage of the sustain signal (CS signal) to each pixel for a predetermined time immediately after the application of the data signal to the same pixel is completed. Change by the time. When the data signal is positive, the sustain signal voltage is changed from a low level to a high level, and when the data signal is negative, the sustain signal voltage is changed from a high level to a low level.

Thereby, since the potential of the pixel electrode can be pushed up or pushed down, the power consumption of the data driver 500 can be reduced.

Japanese Patent Publication “Japanese Patent Laid-Open No. 2008-107831 (Publication Date: May 8, 2008)”

However, the conventional configuration has a problem that the display quality of the liquid crystal display device is lowered.

Generally, in the CS line, it is important to reach the target potential (target potential) within the set specified time. This is because the pixel electrode has a storage capacitor formed between the CS line and a slight potential difference between the target potential and the reaching potential affects the pixel potential and the desired display gradation. This is because cannot be obtained.

In the display device of FIG. 51, since one end of the CS line is connected to a CS driver (retention capacitor line driving circuit), the ultimate potential of the CS line is the side closer to the CS driver in one CS line. A distribution is generated on the far side, and this distribution becomes a distribution of pixel potentials. Finally, it is visually recognized as luminance unevenness in the liquid crystal display device, causing a reduction in display quality.

Further, as shown in FIG. 51, in the configuration in which the CS drivers are arranged at both ends of the display device and the adjacent CS lines are connected to the CS drivers on different sides, the output potential of each CS driver is Due to a slight difference or a difference in distance from each CS driver, for example, a periodic luminance change is generated for each line, which is visually recognized as luminance unevenness, causing a reduction in display quality.

In view of the above problems, an object of the present invention is to improve the display quality of a liquid crystal display device.

In order to solve the above problems, an active matrix substrate according to the present invention is provided.
An active matrix substrate comprising a data signal line, a scanning signal line, a transistor connected to the data signal line and the scanning signal line, a pixel electrode included in a pixel, and a storage capacitor line forming a storage capacitor ,
Each storage capacitor line is supplied with a storage capacitor line signal for driving the storage capacitor line from both ends thereof.

According to the above configuration, each storage capacitor wiring is supplied with a storage capacitor wiring signal (CS signal) simultaneously from both ends thereof, for example, compared with the conventional configuration in which a CS signal is supplied from one side, The arrival time of the CS signal in the storage capacitor wiring can be reduced (up to about 75% reduction). Accordingly, the distribution (non-uniformity) of the pixel potential due to the difference between the target potential and the arrival potential in one storage capacitor wiring can be reduced, so that display quality can be improved.

In the active matrix substrate, a plurality of storage capacitor wiring drive circuits that output the storage capacitor wiring signal may be monolithically formed on a glass substrate.

In the active matrix substrate, a plurality of storage capacitor line drive circuits that output the storage capacitor line signals and the scanning signal line drive circuit may be monolithically formed.

Here, conventionally, a plurality of storage capacitor lines are connected to the storage capacitor wiring trunk, and the storage capacitor wiring trunk is connected to the outside outside the display area (peripheral area of the liquid crystal panel).

The number of storage capacitor wiring trunks (N) is determined according to the required display performance. The smaller the N, the smaller the frame size, but from the viewpoint of display performance, many liquid crystal display devices with N = 12 are mass-produced. Has been.

An electric capacity (hereinafter simply referred to as “capacitance”) loaded on such a storage capacitor wiring trunk includes a capacitance formed by the storage capacitor wiring trunk itself with other electrodes and wiring in the liquid crystal panel, and a storage capacitor wiring. Each storage capacitor wiring connected to the trunk is a total of the capacitance formed with other electrodes and wirings, and is particularly affected by the number of storage capacitor wirings connected to the storage capacitor wiring trunk. Therefore, when the number of storage capacitor lines connected to one storage capacitor line trunk increases, the capacity loaded on the storage capacitor line trunk becomes very large. The storage capacitor wiring trunk extends long in the column direction. In such a configuration, the signal potential from the outside is not quickly transmitted to the storage capacitor wiring trunk and the storage capacitor wiring, and there is a problem that in-plane distribution occurs in the pixel potential and display quality is deteriorated. In order to prevent such a problem, a method of reducing the electrical resistance (hereinafter simply referred to as “resistance”) of the storage capacitor wiring trunk by increasing the wiring width of the storage capacitor wiring trunk can be considered. Therefore, the area size of the storage capacitor wiring trunk in the peripheral area of the liquid crystal panel is increased. In particular, when an active matrix substrate is used for a high-speed drive liquid crystal panel, the display quality deteriorates particularly due to signal delay in the storage capacitor wiring trunk.

In this respect, according to the above configuration, the storage capacitor line driving circuit is formed monolithically on the glass substrate, or formed monolithically on the IC substrate together with the scanning signal line driving circuit. Therefore, since the storage capacitor wiring trunk can be omitted, the frame area of the liquid crystal panel can be reduced and the display quality can be prevented from being lowered.

In the active matrix substrate, the storage capacitor line driving circuit for driving the storage capacitor line supplies the storage capacitor line signal to the storage capacitor line that forms the pixel electrode and the storage capacitor, thereby supplying the storage capacitor line signal from the data signal line. A configuration in which the pixel potential written to the pixel electrode is changed in a direction corresponding to the polarity of the pixel potential may be employed.

In the active matrix substrate,
A plurality of pixel electrodes are provided in one pixel region,
In one pixel region, each storage capacitor formed between each pixel electrode and a storage capacitor line corresponding to the pixel electrode may be different from each other.

According to the above configuration, since the storage capacitor is formed between the plurality of pixel electrodes and the storage capacitor wiring corresponding to the pixel electrode, for example, after writing data signals to the two pixel electrodes, By supplying different holding capacitor wiring signals to the holding capacitor wirings corresponding to the electrodes and raising or lowering the pixel electrode potential (pixel potential) by capacitive coupling, the pixel potentials of the pixel electrodes are made different from each other. Can do. Thereby, the sub-pixel including one pixel electrode can be a bright sub-pixel, and the sub-pixel including the other pixel electrode can be a dark sub-pixel. In other words, a pixel division type liquid crystal display device can be realized. In addition, if each storage capacitor formed between each pixel electrode and the storage capacitor wiring corresponding to the pixel electrode is different from each other in one pixel region, the size of each storage capacitor is adjusted. By doing so, it is possible to appropriately adjust the size of the push-up or push-down of each pixel electrode potential, thereby enabling an efficient pixel electrode layout.

In the active matrix substrate,
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
One storage capacitor line driving internal circuit may be configured to supply the storage capacitor line signal to at least one storage capacitor line.

In the active matrix substrate,
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
The retention capacitor line drive internal circuit is provided every other retention capacitor line,
In two adjacent storage capacitor lines, one storage capacitor line is supplied with the storage capacitor line signal output from the storage capacitor line driving internal circuit, and the other storage capacitor line is output from an external signal source. It is also possible to adopt a configuration in which the processed signal is supplied.

As a result, the number of storage capacitor line drive internal circuits can be reduced as compared with a configuration in which one storage capacitor line drive internal circuit is provided corresponding to one storage capacitor line. The frame area can be reduced.

In the active matrix substrate,
In one pixel region, the first and second pixel electrodes, and first and second transistors connected to the scanning signal line,
The first pixel electrode is connected to the data signal line through the first transistor and forms the storage capacitor line and the first storage capacitor, and the second pixel electrode is connected through the second transistor. In addition, the storage capacitor line and the second storage capacitor may be formed while being connected to the data signal line.

In the active matrix substrate,
The extending direction of each data signal line is the column direction,
The first and second pixel regions are arranged in this order in the column direction, and in each pixel region, the first and second pixel electrodes are arranged in this order in the column direction,
The second pixel electrode in the first pixel region and the first pixel electrode in the second pixel region are adjacent to each other, and each pixel electrode forms the same storage capacitor line and storage capacitor. It can also be set as the structure which is.

In the active matrix substrate,
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
Retention target signal is input to each retention capacitor wiring drive internal circuit,
When the scanning signal supplied to the scanning signal line corresponding to the subsequent pixel after the own stage becomes active, the holding capacitor wiring driving internal circuit corresponding to the own pixel captures the above holding target signal and holds it. And
It is also possible to supply the output of the storage capacitor line driving internal circuit corresponding to the pixel of the own stage as the storage capacitor line signal to the storage capacitor line corresponding to the pixel of the own stage.

In the active matrix substrate,
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
Retention target signal is input to each retention capacitor wiring drive internal circuit,
When the scanning signal supplied to the scanning signal line corresponding to the subsequent pixel after the own stage becomes active, the holding capacitor wiring driving internal circuit corresponding to the own pixel captures the above holding target signal and holds it. And
The output of the storage capacitor wiring driving internal circuit corresponding to the pixel of the own stage is transferred to the storage capacitor wiring corresponding to the pixel of the own stage and the storage capacitor wiring corresponding to the pixel of the previous stage before the own stage. It can also be set as the structure supplied as.

In the active matrix substrate,
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
Retention target signal is input to each retention capacitor wiring drive internal circuit,
The storage capacitor wiring drive internal circuit corresponding to its own stage is
A first input unit for inputting a scanning signal to be supplied to a scanning signal line corresponding to a subsequent pixel after the own stage; second and third input units for inputting the holding target signal; and the holding capacitor wiring An output unit for outputting a signal,
When the potential of the retention target signal input to the second input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a high level potential Output signal,
When the potential of the retention target signal input to the third input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a low level potential Output signal,
In the period when the scanning signal input to the first input unit is inactive, the potential of the holding target signal input to the second and / or third input unit may be held.

In the active matrix substrate,
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
Retention target signal is input to each retention capacitor wiring drive internal circuit,
The storage capacitor wiring drive internal circuit corresponding to its own stage is
A first input unit for inputting a scanning signal to be supplied to a scanning signal line corresponding to a subsequent pixel after the own stage; second and third input units for inputting the holding target signal; and the holding capacitor wiring An output unit for outputting a signal,
When the potential of the retention target signal input to the second input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a high level potential Output signal,
When the potential of the retention target signal input to the third input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a low level potential Output signal,
When the scanning signal input to the first input unit becomes inactive and a scanning signal supplied to a scanning signal line corresponding to a pixel after the subsequent pixel becomes active, A configuration in which the potential of the signal to be held input and held in the second input unit and / or the third input unit is lowered may be employed.

In the active matrix substrate,
A fourth and a fifth input unit for inputting the second holding target signal;
When the potential of the retention target signal input to the second input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a high level potential Output signal,
When the potential of the retention target signal input to the third input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a low level potential Output signal,
When the scanning signal input to the first input unit becomes inactive and the scanning signal supplied to the scanning signal line corresponding to the pixel after the subsequent pixel becomes active, the first signal is input. Configuration for lowering the potential of the holding target signal input to and held in the second input unit and / or the third input unit by the second holding target signal input to the four input unit and / or the fifth input unit It can also be.

In the active matrix substrate,
The pixel regions including a plurality of pixel electrodes are arranged in the row and column directions with the extending direction of each data signal line as the column direction, and first and second data signal lines are provided corresponding to one pixel region column. One scanning signal line is provided corresponding to one pixel region row,
A data signal line connected via a transistor to each pixel electrode included in one of two pixel areas adjacent in the column direction, and a pixel signal connected via a transistor to each pixel electrode included in the other of the two pixel areas. Different data signal lines can be used.

Also, the active matrix substrate may be configured to select two adjacent scanning signal lines simultaneously.

In the active matrix substrate, data signals having opposite polarities can be supplied to the first data signal line and the second data signal line.

In the active matrix substrate,
Two pixel electrodes are provided in one pixel region,
One pixel electrode may surround the other pixel electrode.

In the active matrix substrate,
One pixel area is composed of two sub-pixels,
The subpixel including the one pixel electrode may be a dark subpixel having a relatively low luminance, and the subpixel including the other pixel electrode may be a bright subpixel having a relatively high luminance.

In the active matrix substrate,
One pixel electrode is provided in one pixel region,
In one pixel region, a storage capacitor may be formed between the pixel electrode and a storage capacitor line corresponding to the pixel electrode.

In the active matrix substrate, the storage capacitor line includes a first storage capacitor line group driven by a first storage capacitor line signal output from a storage capacitor line driving circuit that drives the storage capacitor line, and an external A second storage capacitor wiring group driven by a second storage capacitor wiring signal output from the signal source can also be used.

In the active matrix substrate,
The (k-2) -th storage capacitor line and the k-th storage capacitor line are supplied with a storage capacitor line signal output from the k-th storage capacitor line driving internal circuit,
A signal output from an external signal source is supplied to the storage capacitor line in the (k-3) th row and the storage capacitor line in the (k-1) th row,
A scanning signal supplied to the (k + 3) -th scanning signal line may be input to the k-th storage capacitor line driving internal circuit.

In the active matrix substrate, the signal output from the external signal source can be a common electrode potential.

In the active matrix substrate, the second storage capacitor wiring signal can be a common electrode potential.

In order to solve the above problems, a liquid crystal display device according to the present invention is provided.
Comprising any of the above active matrix substrates,
By simultaneously supplying a storage capacitor wiring signal for driving the storage capacitor wiring from both ends thereof to each storage capacitor wiring, the pixel potential written from the data signal line to the pixel electrode is changed to the pixel potential. The display is performed by changing the direction according to the polarity.

This liquid crystal panel includes the above active matrix substrate. The present television receiver includes the above-described liquid crystal display device and a tuner unit that receives a television broadcast.

As described above, in the liquid crystal display device using the present active matrix substrate, a storage capacitor wiring signal for driving the storage capacitor wiring is supplied to each storage capacitor wiring simultaneously from both ends thereof. Therefore, the display quality of the liquid crystal display device can be improved.

It is an equivalent circuit diagram which shows a part of liquid crystal panel 113a in the structural example 1 of the liquid crystal panel of this invention. It is a top view which shows the structural example 1 of the liquid crystal panel of this invention. FIG. 3 is a cross-sectional view showing a specific example of a cross section AB in FIG. 2. FIG. 3 is a cross-sectional view showing a specific example of a cross section AC of FIG. 2. FIG. 5 is a cross-sectional view showing another specific example of the cross section AB in FIG. 2. It is a top view which shows the structural example 2 of the liquid crystal panel of this invention. FIG. 7 is a cross-sectional view showing a specific example of a cross section AB in FIG. 6. It is a top view which shows typically one Embodiment of the liquid crystal display device of this invention. It is a figure for demonstrating the basic electric drive method of the liquid crystal display device of this invention. It is a circuit diagram which shows the structural example 1 of the gate and CS driver in the liquid crystal display device of this invention. FIG. 11 is a circuit diagram showing a specific example of a holding circuit constituting the CS driver of FIG. 10. 11 is a timing chart showing various signals input / output in the holding circuit CSDi-1 in FIG. 10 is a timing chart showing various signal waveforms in the pixel Pi of FIG. 9. 10 is a timing chart showing various signal waveforms in the pixel Pi + 1 in FIG. 9. 10 is a circuit diagram showing a configuration of a gate / CS driver in Modification 1. FIG. 12 is a timing chart showing various signal waveforms of a pixel Pi in Modification 1. 12 is a timing chart showing various signal waveforms of a pixel Pi + 1 in Modification 1. 12 is a timing chart showing various signal waveforms of a pixel Pi in Modification 2. 12 is a timing chart showing various signal waveforms of a pixel Pi + 1 in Modification 2. It is a circuit diagram which shows the structural example 2 of the gate and CS driver in the liquid crystal display device of this invention. FIG. 21 is a timing chart showing various signal waveforms of a pixel Pi in the configuration example 2 of FIG. 20. FIG. 21 is a timing chart showing various signal waveforms of a pixel Pi + 1 in the configuration example 2 of FIG. 20. It is a circuit diagram which shows the structural example 3 of the gate and CS driver in the liquid crystal display device of this invention. 24 is a timing chart showing various signal waveforms of a pixel Pp + 2, a pixel Pp + 3, and a pixel Pp + 4 in the configuration example 3 of FIG. It is a top view which shows typically one Embodiment of the liquid crystal display device of this invention. It is a circuit diagram which shows the structural example 4 of the gate and CS driver in the liquid crystal display device of this invention. FIG. 27 is a circuit diagram illustrating a specific example of a holding circuit configuring the CS driver in the configuration example 4 of FIG. 26. 27 is a timing chart showing various signals input / output in the holding circuit CSDi-1 in FIG. 26. (A) And (b) is a figure for demonstrating the operation | movement reliability evaluation method of the amorphous silicon TFT (a-SiTFT) in this Embodiment. (A) And (b) is a graph which shows the operation | movement reliability of the amorphous silicon TFT (a-SiTFT) in this Embodiment. It is a figure explaining the outline of the simulation circuit for verifying the operation reliability of CS driver in the liquid crystal display device of the present invention. It is a figure which shows the waveform of the signal input into a simulation circuit. 27 shows the relationship between the average potential of the nodes netC1 and netC2 and the output potential arrival time in the holding circuit of FIG. It is a circuit diagram which shows the structural example 5 of the gate and CS driver in the liquid crystal display device of this invention. FIG. 35 is a circuit diagram showing a specific example of a holding circuit constituting the CS driver in Configuration Example 5 of FIG. 34. FIG. 35 is a timing chart showing various signals input / output in the holding circuit CSDi-1 in FIG. 34. FIG. The relationship between the average potential of the nodes netC1 and netC2 and the output potential arrival time in the holding circuit of FIG. 35 is shown. It is a circuit diagram which shows the structural example 6 of the gate and CS driver in the liquid crystal display device of this invention. FIG. 39 is a circuit diagram showing a specific example of a holding circuit constituting the CS driver in Configuration Example 6 of FIG. 38. 40 is a timing chart showing various signals input / output in the holding circuit CSDi-1 in FIG. 39 shows the relationship between the average potential of the nodes netC1 and netC2 and the output potential arrival time in the holding circuit of FIG. It is an equivalent circuit diagram which shows a part of structural example 7 of the liquid crystal panel of this invention. It is a top view which shows the structural example 7 of the liquid crystal panel of this invention. It is an equivalent circuit diagram which shows a part of structural example 8 of the liquid crystal panel of this invention. It is a top view which shows the structural example 8 of the liquid crystal panel of this invention. It is an equivalent circuit diagram which shows a part of structural example 9 of the liquid crystal panel of this invention. It is a top view which shows the structural example 9 of the liquid crystal panel of this invention. It is a block diagram explaining the function of the liquid crystal display device of this invention. It is a block diagram explaining the function of the television receiver of this invention. It is a disassembled perspective view which shows the structure of the television receiver of this invention. FIG. 11 is a plan view schematically showing the form of the display device of Patent Document 1.

This embodiment will be described below with reference to the drawings. For convenience of explanation, hereinafter, the extending direction of the scanning signal lines is referred to as a row direction, and the extending direction of the data signal lines is referred to as a column direction. However, in the use (viewing) state of the liquid crystal display device provided with the present liquid crystal panel (or the active matrix substrate used therein), the scanning signal line may extend in the horizontal direction or in the vertical direction. Needless to say, it is good. In the drawing showing the liquid crystal panel, the alignment regulating structure is appropriately omitted.

FIG. 8 is a plan view schematically showing one embodiment of the liquid crystal display device 110 of the present invention. The liquid crystal display device 110 mainly uses an active matrix substrate 111, a counter substrate (color filter substrate) 112 bonded to the active matrix substrate 111 using a sealant (not shown), and SOF (system on film) technology. The gate driver 9 and the source driver 11 are mounted on the

polyimide films

8 and 10 and the external substrate 12. Here, the counter substrate 112 is shown using a dotted line in FIG. Note that an alignment film, an alignment control structure, and a liquid crystal material are held between the active matrix substrate 111 and the counter substrate 112, which are omitted in FIG. In addition, the liquid crystal display device 110 includes an optical film such as a polarizing film, a backlight, other optical components, circuit components, a bezel for holding these components in a predetermined position, and the like. Is omitted.

The active matrix substrate 111 shown in FIG. 8 includes a glass substrate 1, a scanning signal line 2, a storage capacitor line 3, a data signal line 4, and a pixel electrode 5 formed on the glass substrate 1. The region on the active matrix substrate 111 can be divided into a display region 6 having a plurality of pixels and a peripheral region 7 around it. The peripheral region 7 is provided with a gate terminal 9 a and a source terminal 11 a, and outputs from the gate driver 9 and the source driver 11 are input to the peripheral regions 7 through wirings in the

polyimide films

8 and 10, respectively. An external substrate 12 is mounted on the polyimide film 10. The peripheral region 7 further includes a CS driver (retention capacitor wiring drive circuit) 13 provided on the glass substrate 1. Control signals and power sources for driving the gate driver 9, the source driver 11, and the CS driver 13 are supplied from the external substrate 12 or the like via wirings (not shown) on the

polyimide films

8, 10 and the glass substrate 1. Supplied.

In the liquid crystal display device 110 of the present invention, the gate driver 9 and the CS driver 13 are arranged in rows at both ends of the liquid crystal display device 110 (the left and right ends in FIG. 8) as shown in FIG. Is provided. Both ends of each scanning signal line 2 are connected to different gate drivers 9, respectively, and both ends of each storage capacitor line 3 are connected to different CS drivers 13, respectively.

Here, each storage capacitor wiring 3 is simultaneously supplied with a storage capacitor wiring signal (CS signal) for driving the storage capacitor wiring 3 from both ends thereof. The storage capacitor wiring signal supplied by the CS driver 13 may have a slight time shift, and a time shift that is not affected by the display quality is allowed. However, the potential change of the storage capacitor wiring signal supplied by each CS driver 13 at both ends has a characteristic that varies in the same polarity direction.

Further, the gate driver 9 and the CS driver 13 may be monolithically formed on the glass substrate 1 or the same IC substrate.

(Configuration example 1 of liquid crystal panel)
FIG. 1 is an equivalent circuit diagram showing a part of a liquid crystal panel 113a in the configuration example 1 of the liquid crystal panel of the present invention. As shown in FIG. 1, the liquid crystal panel 113a includes

data signal lines

4x and 4X extending in the column direction (up and down direction on the paper surface), scanning signal lines 2cd, 2ab, 2ef extending in the row direction (left and right direction on the paper surface), rows, and Pixels (pixel regions) 100 to 105 arranged in the column direction,

storage capacitor lines

3w, 3x, 3y, and 3z, and a common electrode (counter electrode) com are included, and the structure of each pixel is the same. Further, as shown in FIG. 1, the pixel column including the pixels 100 to 102 and the pixel column including the pixels 103 to 105 are adjacent to each other.

In the liquid crystal panel 113a, one data signal line and one scanning signal line are provided corresponding to one pixel, and a storage capacitor wiring shared by both pixels is provided between pixels adjacent in the column direction. Yes. Two

pixel electrodes

5c and 5d provided in the pixel 100, two

pixel electrodes

5a and 5b provided in the pixel 101, and two

pixel electrodes

5e and 5f provided in the pixel 102 are arranged in a line, respectively. Both the two

pixel electrodes

5C and 5D provided on the pixel 103, the two

pixel electrodes

5A and 5B provided on the pixel 104, and the two

pixel electrodes

5E and 5F provided on the pixel 105 are arranged in a line. Has been. The

pixel electrodes

5c and 5C, the

pixel electrodes

5d and 5D, the

pixel electrodes

5a and 5A, the

pixel electrodes

5b and 5B, the

pixel electrodes

5e and 5E, and the

pixel electrodes

5f and 5F are adjacent to each other in the row direction.

Since the structure of each pixel is the same, the following description will be given mainly using the pixel 101 as an example.

In the pixel 101, the pixel electrode 5a (first pixel electrode) is connected to the data signal line 4x via the transistor 15a (first transistor) connected to the scanning signal line 2ab, and the pixel electrode 5b (second pixel electrode). Is connected to the data signal line 4x via the transistor 15b (second transistor) connected to the scanning signal line 2ab, the storage capacitor Cha is formed between the pixel electrode 5a and the storage capacitor line 3x, and the pixel electrode 5b and the storage A storage capacitor Chb is formed between the capacitor wirings 3y, a liquid crystal capacitor Cla is formed between the pixel electrode 5a and the common electrode com, and a liquid crystal capacitor Clb is formed between the pixel electrode 5b and the common electrode com.

Thus, each of the

pixel electrodes

5a and 5b is connected to the same data signal line 4x via the

respective transistors

15a and 15b connected to the same scanning signal line 2ab, and thus the

pixel electrodes

5a and 5b. The same signal potential (data signal) can be directly supplied to each through the

transistors

15a and 15b. Since each of the

pixel electrodes

5a and 5b forms a different

storage capacitor line

3x and 3y and a storage capacitor Cha and Chb, for example, the pixel electrode 5a is set with the potential of the scanning signal line 2ab selected (high level). After the data signal is written to 5b, different holding capacitor wiring signals are supplied to the holding

capacitor wires

3x and 3y, and the pixel electrode potential (pixel potential) is pushed up or pushed down by capacitive coupling, whereby the pixel electrode The pixel potentials of 5a and 5b can be made different. Using such a method, for example, a sub-pixel including the pixel electrode 5a is a bright sub-pixel (a pixel having a relatively high luminance), and a sub-pixel including the pixel electrode 5b is a dark sub-pixel (a pixel having a relatively low luminance). ). Thus, a pixel division type liquid crystal display device can be realized.

FIG. 2 shows a specific configuration of the liquid crystal panel 113a in the first configuration example. FIG. 2 is a plan view showing a configuration example 1 of the liquid crystal panel 113a. In the liquid crystal panel 113a of FIG. 2, the data signal line 4x is provided along the pixel 100 and the pixel 101, and the data signal line 4X is provided along the pixel 103 and the pixel 104. A storage capacitor wiring 3w is provided so as to overlap with one side, and a storage capacitor wiring 3x is provided so as to overlap with the other of the edge portions of the

pixels

100 and 103 and one of the edge portions of the

pixels

101 and 104. A storage capacitor wiring 3y is provided so as to overlap the other of the portions. In addition, a scanning signal line 2cd is arranged so as to cross the central part of the

pixels

100, 103, and a scanning signal line 2ab is arranged so as to cross the central part of the

pixels

101, 104.

Further, in a plan view, in the pixel 100, the

pixel electrodes

5c and 5d are arranged in the column direction between the

storage capacitor lines

3w and 3x, and in the pixel 101, the

pixel electrodes

5a and 5b are arranged between the

storage capacitor lines

3x and 3y. In the pixel 103, the

pixel electrodes

5C and 5D are arranged in the column direction between the

storage capacitor lines

3w and 3x. In the pixel 104, the

pixel electrodes

5A and 5B are arranged in the column direction between the

storage capacitor lines

3x and 3y. Are listed.

In the pixel 101, the source electrode 16ab and the drain electrode 17a of the transistor 15a and the source electrode 16ab and the drain electrode 17b of the transistor 15b are formed on the scanning signal line 2ab. In this manner, the source electrode 16ab is connected to the data signal line 4x also serving as both source electrodes of the

transistors

15a and 15b. The drain electrode 17a is connected to the drain lead wire 18a, the drain lead wire 18a is connected to the capacitor electrode 19a, and the capacitor electrode 19a is connected to the pixel electrode 5a through the contact hole 20a. The drain electrode 17b is connected to the drain lead wire 18b, the drain lead wire 18b is connected to the capacitor electrode 19b, and the capacitor electrode 19b is connected to the pixel electrode 5b through the contact hole 20b.

Here, the capacitor electrode 19a overlaps the storage capacitor wiring 3x via the gate insulating film, and the pixel electrode 5a overlaps the storage capacitor wiring 3x via the gate insulating film and the interlayer insulating film. A storage capacitor Cha (see FIG. 1) is formed. Similarly, the capacitor electrode 19b overlaps the storage capacitor wiring 3y via the gate insulating film, and the pixel electrode 5b overlaps the storage capacitor wiring 3y via the gate insulating film and the interlayer insulating film. A storage capacitor Chb (see FIG. 1) is formed.

Note that the configuration of other pixels (the shape and arrangement of each member and the connection relationship) is the same as that of the pixel 101.

3 is a cross-sectional view taken along the line AB in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line AC in FIG. As shown in these drawings, the liquid crystal panel 113 a includes an active matrix substrate 111, a color filter substrate (counter substrate) 112 facing the active matrix substrate 111, and a liquid crystal layer 114 disposed between the

substrates

111 and 112.

In the active matrix substrate 111, scanning signal lines 2ab and

storage capacitor wirings

3x and 3y are formed on the glass substrate 1, and a gate insulating film 21 made of silicon nitride which is an inorganic material is formed so as to cover them. In the

transistors

15a and 15b, the gate electrode of the transistor is formed integrally with the scanning signal line 2ab, and a part of the scanning signal line 2ab on the glass substrate 1 serves as the gate electrode of the

transistors

15a and 15b. On the gate insulating film 21 in the

transistors

15a and 15b, the semiconductor layer 22ab, the source electrode 16ab in contact with the semiconductor layer 22ab, the

drain electrodes

17a and 17b, the

drain lead wires

18a and 18b, and the

capacitor electrodes

19a and 19b are formed. An interlayer insulating film 23 is formed so as to cover it. Although not shown, the semiconductor layer 22ab includes an intrinsic amorphous silicon layer (i layer) and an n + type amorphous silicon layer (n + layer) doped with phosphorus. The n + layer has a role of a contact layer for electrical connection between a semiconductor material such as an i layer and a metal material such as a source electrode 16ab and

drain electrodes

17a and 17b. Note that in the semiconductor layer 22ab (typically, the channel portion of the transistor) that does not overlap with the source electrode 16ab and the

drain electrodes

17a and 17b, the n + layer is removed by etching or the like, and only the i layer is formed. The interlayer insulating film 23 is made of silicon nitride which is an inorganic material. On the interlayer insulating film 23,

pixel electrodes

5a and 5b made of ITO (indium tin oxide) are formed, and an alignment film (not shown) is formed so as to cover the

pixel electrodes

5a and 5b. Here, in the

contact holes

20a and 20b, the interlayer insulating film 23 is penetrated, whereby the pixel electrode 5a and the capacitor electrode 19a are electrically connected, and the pixel electrode 5b and the capacitor electrode 19b are connected. Electrically connected.

On the other hand, in the color filter substrate 112, a black matrix 32 and a colored layer 33 are formed on a glass substrate 31, and a common electrode (com) 34 is formed thereon, and an alignment film (not shown) is formed so as to cover this. Is formed.

Here, an example of a method for manufacturing the active matrix substrate 111 will be described. This manufacturing method is the same as the manufacturing method of a general active matrix substrate including an amorphous silicon transistor.

First, titanium (Ti), aluminum (Al), and titanium (Ti) are sequentially deposited on a transparent insulating substrate (glass substrate 1 in FIG. 3) such as glass or plastic by sputtering using argon (Ar) gas. Then, a gate metal film (not shown) which is a Ti / Al / Ti laminated film is formed. At this time, the film thickness of titanium is, for example, 100 nm (common to the upper layer side and the lower layer side), and the film thickness of aluminum is, for example, 300 nm. The temperature of the glass substrate 1 when forming the gate metal film is set to 200 to 300.degree.

Subsequently, using a photolithography method, that is, a method of forming a resist pattern film of a photoresist material on the target film and patterning the film using the resist pattern film as a mask, the gate metal film is used to form each transistor. A scanning signal line 2ab that also functions as a gate electrode,

storage capacitor lines

3x, 3y, and the like are formed. For the etching of the gate metal film, for example, a dry etching method mainly using a chlorine gas (Cl ₂ ) gas is used. After completion of the etching, the resist pattern film is removed using a stripping solution containing organic alkali.

In addition to aluminum and titanium, the gate metal film is made of indium tin oxide (ITO), tungsten (W), copper (Cu), chromium (Cr), molybdenum (Mo), aluminum (Al), titanium ( It may be a simple metal such as Ti) or a material containing nitrogen, oxygen, or another metal. The gate metal film may be a single layer using the above materials or may have a stacked structure. For example, the scanning signal line may be a Ti / Cu / Ti laminated film made of titanium and copper, or a Mo / Cu / Mo laminated film made of copper and molybdenum.

As a method for forming the gate metal film, an evaporation method or the like can be used in addition to the sputtering method. The thickness of the gate metal film is not particularly limited. Also, the etching method of the gate metal film is not limited to the dry etching method described above, and a wet etching method using an etchant such as an acid can also be used.

Next, a silicon nitride (SiNx) film that becomes the gate insulating film 21, an amorphous silicon film that becomes the intrinsic amorphous silicon layer (i layer), and an n + type amorphous silicon film that becomes the n + type amorphous silicon layer (n + layer) are formed by plasma CVD ( The film is continuously formed by a chemical vapor deposition method or the like. At this time, the film thickness of the silicon nitride film is, for example, 400 nm, the film thickness of the amorphous silicon film is, for example, 200 nm, and the film thickness of the n + type amorphous silicon film is, for example, 50 nm. The temperature of the glass substrate 1 when these films are formed is 200 to 300 ° C., and the gas for film formation is silane (SiH ₄ ), ammonia (NH ₃ ), hydrogen (H ₂ ) and nitrogen (N ₂ ). ) Etc. are used in appropriate combinations.

Subsequently, the silicon nitride film, the amorphous silicon film, and the n + type amorphous silicon film are patterned into a predetermined shape by photolithography, and the gate insulating film 21, the primary processed amorphous silicon film, and the n + type amorphous silicon film are formed. obtain. For this etching, a dry etching method using, for example, an appropriate combination of chlorine gas (Cl ₂ ) gas, carbon tetrachloride (CF ₄ ) gas, and oxygen (O ₂ ) gas is used. After the etching is completed, the resist pattern film is removed using a stripping solution containing organic alkali.

Next, as in the case of the gate metal film, titanium (Ti), aluminum (Al), and titanium (Ti) are sequentially deposited to form a source metal film (not shown) that is a Ti / Al / Ti laminated film. To do. At this time, the film thickness of titanium is, for example, 100 nm (common to the upper layer side and the lower layer side), and the film thickness of aluminum is, for example, 300 nm. As in the case of the gate metal film, the data signal line 4x, the source electrode 16ab, the

drain electrodes

17a and 17b, the

drain lead wires

18a and 18b, and the

capacitor electrodes

19a and 19b are formed from the source metal film by using the photolithography method. Form. Here, the resist pattern film (not shown) used in the photolithography method is left without being removed for the next step. The material of the source metal film may also be composed of other materials similar to the gate metal film.

Next, the amorphous silicon film and the n + type amorphous silicon film are etched again (channel etching) to obtain an intrinsic amorphous silicon layer (i layer) and an n + type amorphous silicon layer (n + layer), and the semiconductor layer 22ab Get. That is, the resist pattern film used to form the pattern of the data signal line 4x, the source electrode 16ab, the

drain electrodes

17a and 17b, etc. is used as a mask, and an n + type amorphous silicon film and an amorphous silicon film are formed by dry etching. A part of the surface is etched. Thereby, separation between the source electrode 16ab and the

drain electrodes

17a and 17b is performed. Here, the partial surface of the amorphous silicon film is etched for reasons such as removing the n + type amorphous silicon film surely by over-etching.

Next, a silicon nitride film to be the interlayer insulating film 23 is formed so as to cover the data signal line 4x, the source electrode 16ab, the

drain electrodes

17a and 17b, the

drain lead wires

18a and 18b, and the

capacitor electrodes

19a and 19b. Here, the temperature of the glass substrate 1 when the silicon nitride film is formed by plasma CVD is set to 200 to 300 ° C., and the gas for film formation includes silane (SiH ₄ ), ammonia (NH ₃ ), Hydrogen (H ₂ ), nitrogen (N ₂ ), and the like are used in appropriate combination. The film thickness of the silicon nitride film is, for example, 300 nm.

Next, using a photolithography method, the silicon nitride film to be the interlayer insulating film 23 is etched into a predetermined pattern to form the interlayer insulating film 23 and

contact holes

20a and 20b. At this time, a method similar to the etching of silicon nitride to be the gate insulating film 21 can be used.

Next, on the interlayer insulating film 23, for example, an ITO (indium tin oxide) film is formed with a film thickness of about 100 nm by sputtering or the like, and is patterned into a necessary shape by photolithography.

Pixel electrodes

5a and 5b are formed in the pixel region. For etching the ITO film, oxalic acid (HOOC-COOH) or ferric chloride solution can be used.

Next, a solution containing an alignment film material is applied by an inkjet method or the like so as to cover the

pixel electrodes

5a and 5b, thereby forming an alignment film (not shown).

The above-described manufacturing method of the active matrix substrate 111 can be applied to a liquid crystal panel described later. Below, the description is abbreviate | omitted for convenience of explanation.

Incidentally, the cross section AB in FIG. 2 may be configured as shown in FIG. FIG. 5 is a cross-sectional view taken along line AB in another configuration of the liquid crystal panel 113 shown in FIG. In the liquid crystal panel of FIG. 5, a thick gate insulating film 21p and a thin gate insulating film 21q are formed on the glass substrate 1, and a thick interlayer insulating film 23p and a thin interlayer insulating film 23q are formed below the pixel electrode 5a. The gate insulating film 21p is removed in the vicinity of the transistor 15a and the capacitor electrode 19a. The interlayer insulating film 23p and the interlayer insulating film 23q have substantially the same planar shape, and the

contact holes

20a and 20b are removed. By doing so, the effects of reducing various parasitic capacitances and preventing short-circuiting between wirings can be obtained. The film thickness of the gate insulating film 21p can be, for example, 1000 nm, the film thickness of the gate insulating film 21q can be, for example, 400 nm, the film thickness of the interlayer insulating film 23p can be, for example, 2500 to 3000 nm, and the film thickness of the interlayer insulating film 23q can be, for example, 300 nm. . Here, the interlayer insulating film 23p is made of an organic material, and the film thickness has a distribution reflecting the underlying unevenness. The interlayer insulating film 23q and the gate insulating film 21q are silicon nitride films using a plasma CVD method.

The gate insulating film 21p of FIG. 5 may be a silicon nitride film or a silicon oxide film using a plasma CVD method as in the case of the gate insulating film 21q, but an insulating film made of an SOG (spin-on-glass) material. It may be.

For example, the interlayer insulating film 23p, the interlayer insulating film 23q, and the

contact holes

20a and 20b in FIG. 5 can be formed as follows. That is, after forming the transistor 15a, the process up to forming a silicon nitride film to be the interlayer insulating film 23q by plasma CVD is the same as in the case of FIG. 3 and FIG. First, a photosensitive acrylic resin film is formed by a photolithography method using a resist material that contains the resist material, and the silicon nitride film is etched using the photosensitive acrylic resin film as a mask to form an interlayer insulating film 23p, an interlayer insulating film 23q, and a

contact hole

20a, 20b can be obtained. Here, the photosensitive acrylic resin film is not removed, and is used as it is as the interlayer insulating film 23p after heat treatment or the like. Etching of the silicon nitride film at this time can be performed in the same manner as in FIGS.

The gate insulating film 21p in FIG. 5 is an insulating film formed from an SOG (spin-on-glass) material, and a film obtained by applying a solution containing the SOG material, heat treatment, or the like is patterned using a photolithography method. Is obtained.

Similarly, the interlayer insulating film 23p may be an insulating film formed of, for example, an SOG (spin-on glass) material, and an acrylic resin, an epoxy resin, or a polyimide is added to the gate insulating film 21p or the interlayer insulating film 23p. At least one of a resin, a polyurethane resin, a novolac resin, and a siloxane resin may be included.

(Configuration example 2 of liquid crystal panel)
Here, the holding capacitors Cha and Chb may be formed by the configuration shown in FIG. FIG. 6 is a plan view showing a configuration example 2 of the liquid crystal panel of the present invention. In the liquid crystal panel 113b of FIG. 6, in the pixel 101,

contact electrodes

26a and 26b and

contact holes

27a and 27b are further provided with respect to the liquid crystal panel 113a of the configuration example 1 of FIG. Here, the

contact electrodes

26a and 26b are formed in the same layer as the

drain lead wires

18a and 18b. The drain electrode 17a of the transistor 15a is connected to the pixel electrode 5a through the drain lead-out wiring 18a and the contact hole 27a, and the pixel electrode 5a is connected to the capacitor electrode 19a through the contact hole 20a. Here, the capacitor electrode 19a overlaps the storage capacitor wiring 3x via the gate insulating film, and the pixel electrode 5a overlaps the storage capacitor wiring 3x via the gate insulating film and the interlayer insulating film. Thus, a holding capacitor Cha (see FIG. 1) is formed.

Similarly, the drain electrode 17b of the transistor 15b is connected to the pixel electrode 5b via the drain lead line 18b and the contact hole 27b, and the pixel electrode 5b is further connected to the capacitor electrode 19b via the contact hole 20b. The capacitor electrode 19b overlaps with the storage capacitor line 3y via the gate insulating film, and the pixel electrode 5b overlaps with the storage capacitor line 3y via the gate insulating film and the interlayer insulating film. A storage capacitor Chb (see FIG. 1) is formed.

FIG. 7 is a cross-sectional view taken along the line AB of FIG. As shown in FIG. 7, the capacitor electrode 19a is formed in the same layer as the drain lead wire 18a and the contact electrode 26a, overlaps the storage capacitor wire 3x via the gate insulating film 21, and the pixel electrode 5a via the contact hole 20a. Connected to. Similarly, the capacitor electrode 19d of the pixel 100 overlaps the storage capacitor wiring 3x via the gate insulating film 21, and is connected to the pixel electrode 5d via the contact hole 20d. As a result, a storage capacitor Cha (see FIG. 1) is formed between the capacitor electrode 19a and the storage capacitor line 3x, and a storage capacitor Chd (see FIG. 1) is formed between the capacitor electrode 19d and the storage capacitor line 3x. The According to this configuration, compared to the configuration example 1 shown in FIG. 2, the drain lead-out

wirings

18a, 18b and the like do not cross over the

entire pixel electrodes

5a, 5b, so that the aperture ratio as a liquid crystal display device is improved. Is particularly suitable.

Next, a driving method of the liquid crystal display device 110 of the present invention will be described. FIG. 9 is a diagram for explaining a basic electrical driving method of the liquid crystal display device 110 shown in FIG. The liquid crystal display device 110 includes a display unit 41, a display control circuit 42, a source driver (data signal line driving circuit) 43, and a gate / CS driver (scanning signal line / holding capacity wiring driving circuit) 44. . The display unit 41 includes n source lines (data signal lines), m gate lines (scanning signal lines), m + 1 CS lines (retention capacitor lines), and m × n pixels. Is provided. In FIG. 9, source lines SL1, SLj (j is an integer from 1 to n), SLj + 1, SLn, gate lines GL1, GL2, GLi (i is an integer from 1 to m), GLi + 1, GLm, The pixels P1, P2, Pi, Pi + 1, Pm arranged corresponding to the intersection of the source line and the gate line, and the CS lines CSL0, CSL1, CSLi-1, CSLi, CSLi + 1, CSLm-1, CSLm, etc. are described. ing. Further, as shown in FIG. 9, the pixel Pi is composed of two subpixels, a subpixel PAi and a subpixel PBi. The same applies to the pixels P1, P2, Pi + 1, and Pm. In the liquid crystal display device 110, for example, m = 1080 and n = 5760, but the present invention is not limited to this. Further, the liquid crystal display device 110 may include a capacitor wiring trunk 47 (described later), which is not shown here.

The display control circuit 42 receives a data signal DAT and a timing control signal TS sent from the outside, receives a digital video signal DV, a source start pulse signal SSP for controlling the timing of displaying an image on the display unit 41, and a source A source control signal SCTL such as a clock signal, a gate start pulse signal GSP, and a gate control signal GCTL such as a gate clock signal are output.

The source driver 43 receives the digital video signal DV, the source start pulse signal SSP for controlling the timing of displaying an image on the display unit 41, and the source control signal SCTL such as the source clock signal from the display control circuit 42, In order to charge the liquid crystal capacitance of each pixel in the display unit 41, a driving data signal is supplied to each source line SL1 to SLn.

The gate / CS driver 44 receives the gate start pulse signal GSP and the gate control signal GCTL output from the display control circuit 42, supplies a gate signal (scanning signal) to each gate line, and supplies a CS signal to each CS line. (Holding capacity wiring signal) is supplied. Here, the gate line and the CS line are driven sequentially, and no interlaced scanning is performed. That is, the gate lines are sequentially driven in order from GL1 to GLm.

In the present embodiment, the gate / CS driver 44 is provided in a row at both ends of the liquid crystal display device 110 (in FIG. 9, the left and right ends of the drawing). Therefore, the gate signal is input to both ends of the gate line GLi, and the CS signal is input to both ends of the CS line CLi.

9 schematically shows driving of the liquid crystal display device 110 by the source driver 43, the gate / CS driver 44, and the display control circuit 42 included in the liquid crystal display device 110. The source driver 43, the gate / CS driver 44, and the like. The power supply, wiring, and other control signals for driving are omitted. Further, wiring for applying a signal potential to the common electrode (com) is also omitted.

(Configuration example 1 of CS driver)
Since the two gate / CS drivers 44 shown in FIG. 9 have the same configuration, one of them will be described below as an example. FIG. 10 is a circuit diagram showing a configuration example 1 of the gate / CS driver 44 in the liquid crystal display device 110 of the present invention. The gate driver 45 is mounted on a polyimide film (not shown) using SOF (system on film) technology. The polyimide film is connected to the glass substrate 1 (see FIG. 8) with an ACF (anisotropic conductive film), and the wiring (not shown) in the polyimide film is connected to a gate terminal (not shown) on the glass substrate 1. ing. The gate driver 45 is composed of a gate driver IC (not shown), and may be divided and mounted on a plurality of polyimide films as shown in FIG. The CS driver 46 is formed integrally (monolithic) on the glass substrate 1. That is, the CS driver 46 is monolithically formed on an active matrix substrate 111 (see FIG. 8) using amorphous silicon as a transistor. The gate driver 45 and the CS driver 46 are provided in a row at both ends of the liquid crystal display device 110 (the left and right ends in FIG. 10). Note that the gate driver 45 may also be formed integrally (monolithically) on the glass substrate 1. Further, the gate driver 45 and the CS driver 46 may be formed integrally (monolithically) on the IC substrate. Since the two gate drivers 45 and CS drivers 46 provided at both ends of the liquid crystal display device 110 have the same configuration, only one gate driver 45 and CS driver 46 will be described below.

In FIG. 10, i and m are shown as even numbers. The gate driver 45 receives the gate start pulse signal GSP and the gate control signal GCTL output from the display control circuit 42, and outputs a drive voltage signal (gate signal) to each of the gate lines GL1 to GLm + 2. Here, the gate lines GLm + 1 and GLm + 2 are gate lines (dummy gate lines) not directly related to the charge control of the pixels, and the gate line GLm + 2 transmits a necessary signal to the CS driver 46. Further, m in the figure is an even number, that is, in the present configuration example 1, the gate lines excluding the dummy gate lines are an even number. However, the present invention is not limited to this. As another configuration example, the number of gate lines excluding dummy gate lines may be an odd number. In that case, the configuration of FIG. The number of gate lines and dummy gate lines may be adjusted.

An even-numbered CS line (second holding capacitor wiring group) such as CSL0, CSL2, CSLi-2, CSLi, CSLi + 2, CSLm-2, CSLm has a signal COM (second holding capacitor) supplied to the capacitor wiring trunk 47. Wiring signal) is supplied by wiring branches. CS drivers represented by CSD1, CSD3, CSDi-1, CSDi + 1, CSDm-1, etc. for odd-numbered CS lines (first storage capacitor wiring group) such as CSL1, CSL3, CSLi-1, CSLi + 1, CSLm-1 An output signal (first holding capacitor wiring signal) of an internal circuit (holding capacitor wiring driving internal circuit; hereinafter also referred to as “holding circuit”) constituting 46 is supplied. That is, the holding circuit is provided corresponding to every other line (odd row) for all the CS lines. However, as another form, the holding circuit may be provided corresponding to every other line (even rows) for all CS lines. In each CS driver configuration described below, the output signal of the holding circuit is the “first holding capacitor wiring signal”, the CS line to which the first holding capacitor wiring signal is input is the “first holding capacitor wiring group”, and the external A signal output from the first signal source and supplied to the capacitor wiring trunk 47 is expressed as a “second storage capacitor wiring signal”, and a CS line to which the second storage capacitor wiring signal is input is expressed as a “second storage capacitor wiring group”. it can. In the following description, the holding circuit CSDi-1 or the like will be described as an example of the holding circuit of the present invention, but the same applies to holding circuits in other stages.

As shown in FIG. 10, the CS driver 46 includes a plurality of holding circuits, includes terminals for receiving signals SEL1, SEL2, VDD, and VSS from the outside, and includes a selection wiring 46a, a selection wiring 46b, The above signals are received through the potential side power supply line 46H and the low potential side power supply line 46L, and the output (gate signal) of the gate driver 45 is received. As an example, the holding circuit CSDi-1 includes terminals sel1, sel2, vdd, and vss for receiving signals SEL1, SEL2, VDD, and VSS from the outside, and includes a selection wiring 46a and a selection wiring. The above signals are received through the high potential side power supply line 46H and the low potential side power supply line 46L. The holding circuit CSDi-1 includes an input terminal s. The input terminal s is connected to the gate line GLi + 2 and receives the output (gate signal) of the gate driver 45. The output (CS signal) of the holding circuit CSDi-1 is input to the CS line CSLi-1 via the output terminal cs. In addition, a terminal here refers to the point on a circuit, and in the actual device form, the corresponding terminal shape for a connection may be provided, and it does not need to be provided. The term “terminal” as used herein may be a single point on the corresponding wiring. In this specification, the term terminal is used in the same manner.

According to the above configuration, the CS signal CSli-1 output from each holding circuit CSDi-1 is simultaneously supplied to both ends of the CS line CSLi-1, and the display control circuit 42 is connected to both ends of the CS line CSLi-1. Are simultaneously supplied to the CS line CSLi + 1, and CS signals output from the holding circuits CSDi + 1 are simultaneously supplied to both ends of the CS line CSLi + 1. Therefore, the arrival time of the CS signal on the CS line can be reduced as compared with the conventional configuration (see FIG. 51) in which the CS signal is supplied from one end side. Accordingly, the distribution (non-uniformity) of the pixel potential due to the difference between the target potential and the arrival potential in one CS line can be reduced, so that display quality can be improved.

In addition, although it is thought that the same problem (brightness nonuniformity) as a CS line arises also about a gate line, the CS line has to give more importance to the potential reached than the gate line. This is because the pixel potential is subject to fluctuations mainly due to the capacitance Cgd (capacitance between the gate and drain (pixel electrodes)) parasitic to the transistor, but this fluctuation can usually be stabilized by providing a CS line. This is because the fluctuation of the pixel potential due to the above does not become a big problem.

FIG. 11 is a circuit diagram showing a specific example of the holding circuit constituting the CS driver 46. As shown in FIG. Taking the holding circuit CSDi-1 as an example, the holding circuit CSDi-1 includes four transistors MS1, MS2, MG, and MH. Here, these transistors are amorphous silicon TFTs formed on a glass substrate.

The terminals s (first input unit), sel1 (second input unit), sel2 (third input unit), vdd, and vss of the holding circuit CSDi-1 are external signals S, SEL1 (holding target signals), SEL2 (holding target signal), VDD, and VSS are input, and a CS signal is output from the terminal cs.

The transistor MS1 has a gate electrode connected to the terminal s of the holding circuit CSDi-1, a source electrode connected to the terminal sel1 of the holding circuit CSDi-1, and a drain electrode connected to the node netC1. The transistor MG has a gate electrode connected to the node netC1, a source electrode connected to the terminal vdd, and a drain electrode connected to the output terminal cs.

The transistor MS2 has a gate electrode connected to the terminal s of the holding circuit CSDi-1, a source electrode connected to the terminal sel2 of the holding circuit CSDi-1, and a drain electrode connected to the node netC2. The transistor MH has a gate electrode connected to the node netC2, a source electrode connected to the output terminal cs, and a drain electrode connected to the terminal vss.

FIG. 12 is a timing chart showing various signals input / output in the holding circuit CSDi-1. Here, the holding circuit CSDi-1 in FIG. 10 is cited as an example of the holding circuit. In FIG. 12, the horizontal axis represents time, the vertical axis represents potential, and the upper side of the paper represents the positive direction. In particular, with respect to the time on the horizontal axis, vertical lines are inserted every 1H (horizontal scanning period) as an indication of timing. Regarding the potential on the vertical axis, the GND level as the reference potential and the COM as the potential of the common electrode (com) are also shown. The same description applies to timing charts described later. The liquid crystal display device 110 of the present embodiment is driven at a frame rate of 120 Hz, for example, 1H (horizontal scanning period) is 7.4 μs, 2H is 14.8 μs, and 1F (frame, vertical scanning period) is 8 Although the time is 3 ms, the present invention is not limited to this.

FIG. 12 shows waveforms of signals S, SEL1, SEL2, VDD, VSS, netC1, netC2, and CS. In the figure, V (netC1) and V (netC2) represent the potentials of the nodes netC1 and netC2, respectively, and CS represents the CS signal output from the terminal cs of the holding circuit CSDi-1. The signal S represents a signal branched from the gate line GLi + 2 and input to the terminal s. In the following description, as in the case of netC1 and netC2, when a signal or potential of a specific part such as a wiring or a node is expressed, the wiring and the node name are enclosed in parentheses and V is added in front. May be expressed.

The waveform of the signal S changes with a period of one frame (vertical scanning period). Here, the high potential state is set once per frame for a period of 2H (horizontal scanning period). In other periods, the potential is low. The potential at the high potential is expressed as Vgh, and the potential at the low potential is expressed as Vgl. The signal waveforms of SEL1 and SEL2 alternately repeat a high potential state and a low potential state every frame. In SEL1 and SEL2, the potential when the potential is high is Vselh, and the potential when the potential is low is Vsell. SEL1 and SEL2 are 180 degrees out of phase with each other. Although not shown in the drawing, the timing at which the potentials of SEL1 and SEL2 are changed is desirably set in a blanking period, which is a period during which no potential is written to the pixel electrode so as not to affect the display. . The potentials of VDD and VSS are constant, and the respective values are expressed as Vcsh and Vcsl. As shown in FIG. 12, the CS signal varies between values Vcsh and Vcsl.

Here, the operation of the holding circuit CSDi-1 will be described with reference to FIG. 11 as well. S plays the role of a start pulse of the holding circuit CSDi-1, and the gate line GLi + 2 corresponding to the pixel at the latter stage after the own stage. When the signal potential (gate signal) becomes active (selected), the potential of the signal S rises from Vgl to Vgh, the transistors MS1 and MS2 are turned on, and the potentials of the nodes netC1 and netC2 are SEL1 and SEL2, respectively. Approaches the potential of. When 2H elapses after S becomes Vgh, when the potential of S again decreases to Vgl, the transistors MS1 and MS2 are turned off, and the potentials of the nodes netC1 and netC2 are the transistors MS1, MS2 regardless of the potentials of SEL1 and SEL2. It is held at the potential when MS2 is turned off.

Since the phases of SEL1 and SEL2 are shifted by 180 °, one of the nodes netC1 and netC2 has a high state (selected state) and the other has a low state (non-selected state). Correspondingly, one of the transistors MG and MH is selected and the other is not selected. The potential of the output CS signal changes according to the potentials of the nodes netC1 and netC2, but since the terminal cs is connected to the CS line of the display unit and charging takes time, the change is more gradual than the nodes netC1 and netC2. Become. The potential of the CS signal is substantially stabilized in the vicinity of the potential of Vcsh or Vcsl after a predetermined time has elapsed according to the selection / non-selection state of the transistors MG and MH. Since the nodes netC1 and netC2 function as holding units, even if the potentials of SEL1 and SEL2 change, the potentials are held until the next change of the potential of S, that is, for approximately one frame time. As a result, the CS signal Is maintained.

As a specific example, in the first and second frames that are continuous, in the first frame, when S becomes Vgh at time t1, the transistors MS1 and MS2 are turned on, the terminal sel1 and the node netC1 become conductive, and the node netC1 Increases, the terminal sel2 and the node netC2 become conductive, and the potential of the node netC2 decreases. The transistor MG is turned on by the high potential of the node netC1, and the transistor MH is turned off by the low potential of the node netC2, so that the potential of the CS signal approaches the potential Vcsh of VDD.

In the second frame, when S becomes Vgh at time t1 + 1F, the transistors MS1 and MS2 are turned on, the terminal sel1 and the node netC1 are turned on, the potential of the node netC1 is lowered, the terminal sel2 and the node netC2 are turned on, and the node The potential of netC2 increases. The transistor MG is turned off by the low potential of the node netC1, and the transistor MH is turned on by the high potential of the node netC2, so that the potential of the CS signal approaches the potential Vcsl of VSS.

The holding circuit CSDi-1 repeats the operations of the first and second frames alternately.

More precisely, the potentials of the nodes netC1 and netC2 are both in the range of the values Vselh and Vsel, but depending on the circuit configuration and transistor characteristics, the potentials of the nodes netC1 and netC2 completely reach Vselh and Vsel. There are things that do not. In particular, when the transistor is an amorphous silicon TFT, the charging capability is insufficient due to low mobility, and the potentials of the nodes netC1 and netC2 may not reach sufficiently.

FIG. 13 is a timing chart showing various signal waveforms in the pixel Pi shown in FIG. 9, and corresponds to the even-numbered gate lines GLi. FIG. 14 is a timing chart showing various signal waveforms in the pixel Pi + 1, which corresponds to the odd-numbered gate line GLi + 1. Note that i is an even number. In FIG. 13 and FIG. 14, as in FIG. 12, especially with respect to the time on the horizontal axis, vertical lines are inserted every 1H (horizontal scanning period) as an indication of timing. Regarding the potential on the vertical axis, the potential GND as the reference potential and the COM as the potential of the common electrode (com) are also shown. The same applies to the subsequent timing charts. The first and second frames in FIGS. 13 and 14 correspond to the first and second frames in FIG. 12, respectively, and time t2 is a time 2H before time t1. That is, (time t2) = (time t1-2H). In the following, an example of signal changes in the pixel Pi, the pixel Pi + 1 and the periphery thereof will be described, but the same applies to the pixels in the other stages and the periphery thereof except for the overall timing shift due to the sequential scanning of each stage. is there.

In FIG. 13, V (GLi) indicates the potential of the gate line GLi, V (SLj) indicates the potential of the source line SLj, V (CSLi-1) indicates the potential of the CS line CSLi-1, and V (CSLi-1). ) Indicates the potential of the CS line CSLi, and V (PAi) and V (PBi) indicate the pixel potentials of the sub-pixels PAi and PBi, respectively. As shown in FIG. 9, the charge of the pixel Pi having the sub-pixels PAi and PBi is controlled by the gate line GLi, the source line SLj, and the CS lines CSLi-1 and CSLi. The source line SLj may be an arbitrary line, and j can be arbitrarily determined in the range of 1 to n.

First, the first frame in FIG. 13 will be described. It is assumed that the potential (gate signal) of the gate line GLi rises at time t2. The potential (data signal) of the source line SLj is switched between a higher potential side and a lower potential side than COM for each frame on the basis of the potential COM of the common electrode (com), but a detailed potential is a video signal to be displayed. It depends on. The first frame shows a case where the potential of the source line SLj is on the positive side (plus polarity) from COM. Since the holding circuit CSDLi-1 starts operation at the timing when the gate line GLi + 2 becomes active (selected state) (see FIG. 12), the potential of the CS line CSLi-1 changes in potential at time t2 + 2H (= time t1). To start. Here, as shown in FIG. 12, since the potential of SEL1 input to the holding circuit CSDLi-1 is a high potential, the potential of the CS line CSLi-1 changes to the positive side.

As shown in FIG. 10, since the CS line CSLi is connected to the capacitor wiring trunk 47 and a constant potential (COM) is supplied, there is no potential change of the CS line CSLi.

In the sub-pixel PAi, since the potential of the gate line GLi is high (Vgh) from time t2 to t2 + 2H, the potential (data signal) of the source line SLj is directly written. After time t2 + 2H, the potential of the gate line GLi becomes a low potential (Vgl), so that the corresponding transistor is turned off, and charging / discharging is not performed. That is, the subpixel PAi is in a floating state. Here, as shown in FIG. 9, in the sub-pixel PAi, since the storage capacitor is formed (capacitive coupling) between the pixel electrode and the CS line CSLi-1, the potential of the sub-pixel PAi is turned off by the transistor. Later, under the influence of the potential fluctuation (low potential → high potential) of the CS line CSLi-1, it rises to the positive side. The magnitude ΔV of the change in the pixel potential due to the capacitive coupling drive is given by ΔV = (Vcsh−Vcsl) × K. Here, K = CCS / (CCS + CLC), and CCS and CLC are respectively the pixel electrode of the corresponding sub-pixel (here, PAi), the CS line (here, CSLi-1), and the common electrode (com) ) Are substantially formed (retention capacitors and liquid crystal capacitors, respectively). Here, the capacitor that is substantially formed means that, for example, the CS line has a capacitor electrode, and a storage capacitor may be formed between the pixel electrode and the CS line via the capacitor electrode. It is. The same applies to K in the equation described later.

In the sub-pixel PBi, a storage capacitor is formed between the pixel electrode and the CS line CSLi. However, since the potential of the CS line CSLi is constant, in the floating state after time t2 + 2H (after the transistor is turned off). The pixel potential does not change.

Next, the second frame will be described. The potential of the gate line GLi rises at time t2 + 1F. In the second frame, the potential of the source line SLj is more negative (minus polarity) than COM. Further, as shown in FIG. 12, since the potential of SEL2 input to the holding circuit CSDLi-1 is a high potential, the potential of the CS line CSLi-1 changes to the negative side.

From time t2 + 1F to t2 + 1F + 2H, since the potential of the gate line GLi is high (Vgh), the potential (data signal) of the source line SLj is directly written into the sub-pixels PAi and PBi. After time t2 + 1F + 2H, since the potential of the gate line GLi becomes a low potential (Vgl), the corresponding transistor is turned off and charging / discharging is not performed. That is, the subpixel PAi is in a floating state. Here, as shown in FIG. 9, in the sub-pixel PAi, since the storage capacitor is formed (capacitive coupling) between the pixel electrode and the CS line CSLi-1, the potential of the sub-pixel PAi is turned off by the transistor. Later, under the influence of the potential fluctuation (high potential → low potential) of the CS line CSLi-1, it falls to the negative side. The magnitude ΔV of the change in potential of the sub-pixel PAi at this time is given by (Vcsh−Vcsl) × K, as in the first frame.

In the subpixel PBi, a storage capacitor is formed between the pixel electrode and the CS line CSLi. However, since the potential of the CS line CSLi is constant, the subpixel PBi is in a floating state after time t2 + 1F + 2H (after the transistor is turned off). The pixel potential does not change.

The write (charge) operation of the data signal potential in the pixel Pi repeats the operations of the first and second frames.

According to the above operation, the potentials of the subpixels PAi and PBi can be made different from each other even though the data signals are supplied to the subpixels PAi and PBi from the same source line SLj at the same timing. Therefore, in the display mode in which the liquid crystal display device is normally black, the subpixel PAi can be the bright subpixel and the subpixel PBi can be the dark subpixel due to the potential difference with the potential COM of the common electrode (com). Thus, a pixel division type liquid crystal display device can be realized.

Next, the potential change in the pixel Pi + 1 corresponding to the odd-numbered gate line GLi + 1 will be described with reference to FIG.

In FIG. 14, V (GLi + 1) indicates the potential of the gate line GLi + 1, V (SLj) indicates the potential of the source line SLj, V (CSLi) indicates the potential of the CS line CSLi, and V (CSLi + 1) indicates the CS line. CSLi + 1 indicates the potential, and V (PAi + 1) and V (PBi + 1) indicate the pixel potentials of the sub-pixels PAi + 1 and PBi + 1, respectively.

As shown in FIG. 9, the pixel Pi + 1 having the sub-pixels PAi + 1 and PBi + 1 is controlled to be charged by the gate line GLi + 1, the source line SLj, and the CS lines CSLi and CSLi + 1. Note that j can be arbitrarily determined in the range of 1 to n.

The first frame shows a case where the potential (data signal) of the source line SLj is on the positive side (positive polarity) with respect to COM.

Since the holding circuit CSDLi + 1 starts operating at the timing when the gate line GLi + 4 becomes active (selected state), the potential of the CS line CSLi + 1 starts to change at time t2 + 4H. Here, as shown in FIG. 12, since the potential of SEL1 input to the holding circuit CSLi + 1 is high, the potential of the CS line CSLi + 1 changes to the positive side.

As described above, since the CS line CSLi is connected to the capacitor wiring trunk 47 and is supplied with a constant potential (COM), there is no potential change of the CS line CSLi.

From time t2 + 1H to t2 + 3H, since the potential of the gate line GLi + 1 is high (Vgh), the potential (data signal) of the source line SLj is directly written into the sub-pixels PAi + 1 and PBi + 1. After the time t2 + 3H, the potential of the gate line GLi + 1 becomes a low potential (Vgl), so that the corresponding transistor is turned off and charging / discharging is not performed. That is, the subpixel PBi + 1 is in a floating state. Here, as shown in FIG. 9, in the subpixel PBi + 1, since a storage capacitor is formed (capacitive coupling) between the pixel electrode and the CS line CSLi + 1, the potential of the subpixel PBi + 1 is changed after the transistor is turned off. Under the influence of the potential fluctuation (low potential → high potential) of the CS line CSLi + 1 at the time t2 + 4H, it rises to the positive side. The magnitude ΔV of the potential change of the sub-pixel PBi + 1 at this time is given by ΔV = (Vcsh−Vcsl) × K.

Note that in the subpixel PAi + 1, a storage capacitor is formed between the pixel electrode and the CS line CSLi. However, since the potential of the CS line CSLi is constant, in the floating state after time t2 + 3H (after the transistor is turned off). The pixel potential does not change.

Next, the second frame will be described. The potential of the gate line GLi + 1 rises at time t2 + 1F + 1H. In the second frame, the potential of the source line SLj is more negative (minus polarity) than COM. As shown in FIG. 12, since the potential of SEL2 input to the holding circuit CSDLi + 1 is a high potential, the potential of the CS line CSLi + 1 changes to the negative side.

From time t2 + 1F + 1H to t2 + 1F + 3H, since the potential of the gate line GLi + 1 is high (Vgh), the potential (data signal) of the source line SLj is directly written to the subpixels PAi + 1 and PBi + 1. After time t2 + 1F + 3H, the potential of the gate line GLi + 1 is low (Vgl), so that the corresponding transistor is turned off and charging / discharging is not performed. That is, the subpixel PBi + 1 is in a floating state. Here, as shown in FIG. 9, in the subpixel PBi + 1, since a storage capacitor is formed (capacitive coupling) between the pixel electrode and the CS line CSLi + 1, the potential of the subpixel PBi + 1 is changed after the transistor is turned off. Under the influence of the potential fluctuation (high potential → low potential) of the CS line CSLi + 1, it falls to the negative side. The magnitude ΔV of the change in potential of the sub-pixel PBi + 1 at this time is given by (Vcsh−Vcsl) × K, as in the first frame.

Note that in the subpixel PAi + 1, a storage capacitor is formed between the pixel electrode and the CS line CSLi + 1. However, since the potential of the CS line CSLi + 1 is constant, in the floating state after the time t2 + 1F + 3H (after the transistor is turned off). The pixel potential does not change.

The write (charge) operation of the data signal potential in the pixel Pi + 1 repeats the operations of the first and second frames.

According to the above operation, the potentials of the subpixels PAi + 1 and PBi + 1 can be made different from each other even though the data signal is supplied to the subpixels PAi + 1 and PBi + 1 at the same timing from the same source line SLj. Therefore, in the display mode in which the liquid crystal display device is normally black, the subpixel PAi + 1 can be a dark subpixel and the subpixel PBi + 1 can be a bright subpixel due to a potential difference with the potential COM of the common electrode (com). Thus, a pixel division type liquid crystal display device can be realized.

As described above, in the liquid crystal display device 110 of the present invention, the liquid crystal panel 113a is provided on the glass substrate 1 with a CS driver (holding capacity wiring driving circuit) composed of a plurality of holding circuits (holding capacity wiring driving internal circuits), and holding. The CS line (retention capacitor line) has an output from the holding circuit or an output obtained by dividing a signal supplied to the retention capacitor line trunk at the same time. Input as a storage capacitor wiring signal). According to this configuration, since the arrival time of the CS signal in the CS line can be reduced, the distribution (nonuniformity) of the pixel potential due to the difference between the target potential and the arrival potential in one CS line can be reduced. Display quality can be improved.

Here, the storage capacitor wiring trunk is DC driven with a constant potential (for example, COM) input from the outside, and is not AC driven. Therefore, the storage capacitor wiring trunk can reduce the wiring width. This is because the signal delay in the storage capacitor wiring trunk and the storage capacitor wiring hardly affects the display. Further, since the holding circuit can be constituted by four TFTs as shown in FIG. 11, the circuit configuration of the CS driver can be simplified. Furthermore, since the wiring for transmitting the signals SEL1, SEL2, VDD, and VSS for driving the holding circuit may be thin, the area occupied by the CS driver on the active matrix substrate can be reduced. The reason why these wirings may be thin is that, due to the circuit configuration, the line capacitance of the selection wiring 46a and the selection wiring 46b for transmitting the signals SEL1 and SEL2 can be reduced, and the signals SEL1 and SEL2 are in the blanking period. This is because the potential is changed only in the case of VDD and VSS may be constant. Therefore, according to the above configuration, since a circuit and a wiring for supplying a CS signal to the CS line can be manufactured with a small occupied area, the frame of the liquid crystal panel and the liquid crystal display device including the liquid crystal panel can be reduced.

(Modification 1)
Next, a first modification of the gate / CS driver 44 of the first configuration example will be described. In the above configuration example 1, the potential (scanning signal) of the gate line GLi is set to a high potential (Vgh) only during the period of 2H (horizontal scanning period), and the data signal is supplied to the corresponding pixel. However, the high potential period may be set to, for example, 1H or 3H or more according to standards such as the required size, resolution, and frame rate of the liquid crystal display device. In the case where the high potential period is set to 1H, a pixel division type liquid crystal display device can be realized even if the gate signal input to the holding circuit CSDi-1 is GLi + 1. FIG. 15 is a circuit diagram of the gate / CS driver showing this configuration, and FIGS. 16 and 17 are timing charts showing various signal waveforms in the pixels Pi and Pi + 1 when the gate / CS driver of FIG. 15 is applied. It is.

According to the configuration of the first modification, for the pixel Pi, as shown in FIG. 16, the potential of the sub-pixel PAi changes in the potential of the CS line CSLi-1 at time t2 + 1H (low potential → high potential) in the first frame. The magnitude of ΔV rises to the positive side by the magnitude of ΔV, and is affected by the potential fluctuation (high potential → low potential) of the CS line CSLi-1 at time t2 + 1F + 1H in the second frame. Just go down to the negative side. Note that the potential of the sub-pixel PBi does not change in the floating state after the transistor is turned off, as in FIG. Thereby, the subpixel PAi can be a bright subpixel and the subpixel PBi can be a dark subpixel.

For the pixel Pi + 1, as shown in FIG. 17, the potential of the sub-pixel PBi + 1 is affected by the potential fluctuation (low potential → high potential) of the CS line CSLi + 1 at time t2 + 3H in the first frame, and the magnitude of ΔV It rises to the positive side, and in the second frame, it is affected by the potential fluctuation (high potential → low potential) of the CS line CSLi + 1 at time t2 + 1F + 3H, and falls to the negative side by the magnitude of ΔV. Note that the potential of the subpixel PAi + 1 does not change in the floating state after the transistor is turned off, as in FIG. Thereby, the subpixel PAi + 1 can be a dark subpixel, and the subpixel PBi + 1 can be a bright subpixel.

(Modification 2)
Next, a second modification of the gate / CS driver 44 of the first configuration example will be described. In the second modification, the potentials of the signals SEL1 (holding target signal) and SEL2 (holding target signal) shown in FIG. 12 are inverted. That is, in the first frame, SEL1 is set to a low potential (Vsel), SEL2 is set to a high potential (Vselh), and in the second frame, SEL1 is set to a high potential (Vselh), and SEL2 is set to a low potential (Vsel). Thereby, although not shown, the potential change of the CS signal shown in FIG. 12 is reversed. 18 and 19 are timing charts showing various signal waveforms in the pixels Pi and Pi + 1 when the CS signal is used.

Regarding the pixel Pi, in the first frame, as shown in FIG. 18, since the potential of the gate line GLi is high (Vgh) from time t2 to t2 + 2H, the potential (data signal) of the source line SLj is subpixel PAi. , PBi is directly written, and after time t2 + 2H, the potential of the gate line GLi becomes a low potential (Vgl), so that the corresponding transistor is turned off, and charging / discharging is not performed and the floating state is entered. When the subpixel PAi is in a floating state, the potential of the subpixel PAi drops to the negative side by the magnitude of ΔV due to the influence of the potential fluctuation (high potential → low potential) of the CS line CSLi-1. In the sub-pixel PBi, a storage capacitor is formed between the pixel electrode and the CS line CSLi. However, since the potential of the CS line CSLi is constant, in the floating state after time t2 + 2H (after the transistor is turned off). The pixel potential does not change.

In the second frame, since the high and low levels of the potentials of the source line SLj and the CS line CSLi-1 are reversed from those in the first frame, the potential of the subpixel PAi is changed after the transistor is turned off. Under the influence of (low potential → high potential), it rises to the positive side by the magnitude of ΔV. In the sub-pixel PBi, the pixel potential does not change because the potential of the CS line CSLi is constant as in the first frame.

According to the above operation, the subpixel PAi can be a dark subpixel and the subpixel PBi can be a bright subpixel.

For the pixel Pi + 1, in the first frame, as shown in FIG. 19, since the potential of the gate line GLi + 1 is high (Vgh) from time t2 + 1H to t2 + 3H, the potential (data signal) of the source line SLj is subpixel PAi + 1. , PBi + 1 is directly written, and after time t2 + 3H, the potential of the gate line GLi + 1 becomes a low potential (Vgl), so that the corresponding transistor is turned off, charging and discharging are not performed, and the floating state is entered. When the pixel PBi + 1 is in the floating state, the potential of the sub-pixel PBi + 1 is pushed down to the negative side by the magnitude of ΔV due to the influence of the potential fluctuation (high potential → low potential) of the CS line CSLi + 1. Note that in the subpixel PAi + 1, a storage capacitor is formed between the pixel electrode and the CS line CSLi. However, since the potential of the CS line CSLi is constant, in the floating state after time t2 + 3H (after the transistor is turned off). The pixel potential does not change.

In the second frame, the high and low levels of the potentials of the source line SLj and the CS line CSLi + 1 are reversed from those in the first frame. Therefore, the potential of the subpixel PBi + 1 is changed after the transistor is turned off. Under the influence of (high potential), it pushes up to the positive side by ΔV. In the sub-pixel PAi + 1, the pixel potential does not change because the potential of the CS line CSLi is constant as in the first frame.

Thereby, the subpixel PAi + 1 can be a bright subpixel and the subpixel PBi + 1 can be a dark subpixel.

In the above configuration, in order to set the pixel potentials in the bright subpixel and the dark subpixel to the same level as the pixel potentials in the bright subpixel and the dark subpixel by the driving shown in FIGS. Further, the amplitude of the potential (data signal) of the source line SLj in FIG. 14 must be increased on average, which may increase the heat generation of the source driver. Further, due to the heat resistance of the source driver against heat generation, it becomes disadvantageous in manufacturing a large-sized liquid crystal display device, and the power consumption of the liquid crystal display device increases. Therefore, in order to improve the display quality of the liquid crystal display device and reduce the frame, in addition to achieving heat resistance and low power consumption, the above-described configurations of FIGS. 13 and 14 are preferable.

Also in the configurations of the first and second modifications shown above, the arrival time of the CS signal in the CS line can be shortened, so that the distribution of the pixel potential due to the difference between the target potential and the arrival potential in one CS line (Non-uniformity) can be reduced, and display quality can be improved. Further, since a circuit and wiring for supplying a signal to the CS line can be manufactured with a small occupied area, the frame of the liquid crystal display device can be reduced.

(Modification 3)
In the configuration example 1 and the

modifications

1 and 2 described above, the transistors constituting the

transistors

15a and 15b and the CS driver 13 on the glass substrate 1 use amorphous silicon as the semiconductor layer. However, the present invention is not limited to this, and the above semiconductor layer may include a microcrystalline silicon film, another crystalline silicon film, or a metal oxide semiconductor film. Further, the semiconductor layer described above may have a two-layer structure or a multilayer structure of an intrinsic layer and a low-resistance contact layer as in the case of an amorphous silicon TFT.

Here, the microcrystalline silicon film is a silicon film having a mixed state of a crystalline phase composed of microcrystalline grains and an amorphous phase. A polycrystalline silicon film is composed of a crystal phase and a few crystal grain boundaries between them, and has a very high crystallization rate. The metal oxide semiconductor film is specifically a Zn—O based semiconductor (ZnO) film, an In—Ga—Zn—O based semiconductor (IGZO) film, an In—Zn—O based semiconductor (IZO) film, A metal oxide semiconductor film such as a Zn—Ti—O based semiconductor (ZTO) film is known and contains zinc (Zn), indium (In), gallium (Ga) or the like as a main component as a constituent metal element. There are many.

When these materials are used, a transistor having higher mobility than that of an amorphous silicon transistor can be formed. Therefore, if a CS driver like the present invention is formed on a glass substrate as in the present invention, the frame of the liquid crystal display device can be formed. This is useful because it can be made smaller. In particular, it is desirable for the present invention to use a high mobility TFT having a saturation mobility of 1 cm ² / V · s or more.

Note that the CS driver 46 of Configuration Example 1 and

Modifications

1 and 2 thereof may be formed integrally (monolithically) on the glass substrate 1 together with the gate driver. In particular, in the third modification, it is desirable to form a gate / CS driver using a high mobility TFT having a saturation mobility of 1 cm ² / V · s or more. Since the CS driver shares the signal line, internal circuit, and internal node necessary for driving, and the terminal for mounting the gate driver on the polyimide film is not required, the frame is further narrowed. Can do.

These are the same in the following configuration examples and variations thereof.

(CS driver configuration example 2)
FIG. 20 is a circuit diagram showing a configuration example 2 of the gate / CS driver 48 in the liquid crystal display device 110 of the present invention. For convenience, the same reference numerals are given to the same components as those in the first configuration example, and the description thereof is omitted. The gate driver 45 is mounted on the polyimide film using SOF (system on film) technology. The polyimide film is connected to the glass substrate 1 (see FIG. 8) with an ACF (anisotropic conductive film), and the wiring (not shown) in the polyimide film is connected to a gate terminal (not shown) on the glass substrate 1. ing. The gate driver 45 is composed of a gate driver IC (not shown), and may be divided and mounted on a plurality of polyimide films as shown in FIG. The CS driver 49 is integrally formed (monolithic) on the glass substrate 1. That is, the CS driver 49 is monolithically formed on an active matrix substrate 111 (see FIG. 8) using amorphous silicon as a transistor. Unlike the configuration example 1, the gate / CS driver 48 of the configuration example 2 does not include a capacitor wiring trunk. In FIG. 20, i is described as an even number. The gate driver 45 and the CS driver 49 are provided in a row at both ends of the liquid crystal display device 110 (the left and right ends in FIG. 20). Note that the gate driver 45 may also be formed integrally (monolithically) on the glass substrate 1. Further, the gate driver 45 and the CS driver 49 may be integrally formed (monolithic) on the IC substrate. Since the two gate drivers 45 and the CS drivers 49 provided at both ends of the liquid crystal display device 110 have the same configuration, only one gate driver 45 and the CS driver 49 will be described below.

Unlike the gate / CS driver 44 of the configuration example 1 shown in FIG. 10, the CS driver 49 includes a plurality of holding circuits CSD0 to CSDm individually provided corresponding to all the CS lines CSL0 to CSLm. It is configured to include. In the following description, the holding circuit CSDi-1 and the like will be described as an example of the holding circuit of the present invention, but the same applies to holding circuits in other stages.

The CS driver 49 includes terminals for receiving signals SEL1, SEL2, VDD, and VSS from the outside, and each of the above-described components via the selection wiring 46a, the selection wiring 46b, the high potential side power supply line 46H, and the low potential side power supply line 46L. A signal is received and an output (gate signal) of the gate driver 45 is received. As an example, the holding circuit CSDi-1 includes terminals sel1, sel2, vdd, and vss for receiving signals SEL1, SEL2, VDD, and VSS from the outside, and includes a selection wiring 46a and a selection wiring. The above signals are received through the high potential side power supply line 46H and the low potential side power supply line 46L. The holding circuit CSDi-1 includes an input terminal s. The input terminal s is connected to the gate line GLi + 2 and receives the output (gate signal) of the gate driver 45. The output (CS signal) of the holding circuit CSDi-1 is input to the CS line CSLi-1 via the output terminal cs. Note that the CS line CSLi-1 has both ends connected to the holding circuits CSDi-1 of the CS drivers 49 provided at both ends of the liquid crystal display device 100, respectively. Are simultaneously supplied with the output (CS signal) of each holding circuit CSDi-1 from both ends thereof.

Also, the even-numbered holding circuit and the odd-numbered holding circuit are alternately switched between the input SEL1 and SEL2. For example, in FIG. 20, i is described as an even number, and in the odd-stage holding circuit CSDi-1, the signal SEL2 is input to the terminal sel1 and the signal SEL1 is input to the terminal sel2. In the even-stage holding circuit CSDi, the signal SEL1 is input to the terminal sel1, and the signal SEL2 is input to the terminal sel2. Other circuit configurations such as the size and connection of the transistors constituting the holding circuit are the same as those in the first configuration example.

FIGS. 21 and 22 are timing charts showing various signal waveforms in the pixels Pi and Pi + 1 when the CS signal is used.

Regarding the pixel Pi, in the first frame, as shown in FIG. 21, since the potential of the gate line GLi is high (Vgh) from time t2 to t2 + 2H, the potential (data signal) of the source line SLj is subpixel. Directly written in PAi and PBi, and after time t2 + 2H, the potential of the gate line GLi becomes a low potential (Vgl), so that the corresponding transistor is turned off, charging and discharging are not performed, and a floating state is entered. When the subpixel PAi is in a floating state, the potential of the subpixel PAi rises by the magnitude of ΔV to the positive side due to the influence of the potential fluctuation (low potential → high potential) of the CS line CSLi-1. On the other hand, when the sub-pixel PBi is in a floating state, the potential of the sub-pixel PBi is pushed down by the magnitude of ΔV to the negative side due to the influence of the potential fluctuation (high potential → low potential) of the CS line CSLi.

In the second frame, the high and low levels of the potentials of the source line SLj and the CS lines CSLi-1 and CSLi are reversed from those in the first frame, so that the potential of the sub-pixel PAi is set to the level of the CS line CSLi-1 after the transistor is turned off. Under the influence of the potential fluctuation (high potential → low potential), the voltage drops to the negative side by the magnitude of ΔV, and the potential of the sub-pixel PBi becomes the potential fluctuation (low potential → high potential) of the CS line CSLi after the transistor is turned off. ) To the positive side by ΔV.

According to the above operation, the subpixel PAi can be a bright subpixel and the subpixel PBi can be a dark subpixel.

Regarding the pixel Pi + 1, in the first frame, as shown in FIG. 22, since the potential of the gate line GLi is high (Vgh) from time t2 + 1H to t2 + 3H, the potential (data signal) of the source line SLj is subpixel. Directly written in PAi + 1 and PBi + 1, and after time t2 + 3H, since the potential of the gate line GLi becomes low potential (Vgl), the corresponding transistor is turned off, charging and discharging are not performed, and the floating state is entered. When the pixel PAi + 1 is in a floating state, the potential of the sub-pixel PAi + 1 is pushed down by the magnitude of ΔV to the negative side due to the influence of the potential fluctuation (high potential → low potential) of the CS line CSLi. On the other hand, when the pixel PBi + 1 is in a floating state, the potential of the sub-pixel PBi + 1 rises by the magnitude of ΔV to the positive side due to the influence of the potential fluctuation (low potential → high potential) of the CS line CSLi + 1.

In the second frame, since the high and low levels of the potentials of the source line SLj, CS line CSLi, and CS line CSLi + 1 are reversed from those in the first frame, the potential of the subpixel PAi + 1 is the potential of the CS line CSLi after the transistor is turned off. Under the influence of the fluctuation (low potential → high potential), it rises to the positive side by ΔV. The potential of the sub-pixel PBi + 1 is affected by the potential fluctuation (high potential → low potential) of the CS line CSLi + 1 after the transistor is turned off, and falls to the negative side by the magnitude of ΔV.

Thereby, the sub-pixel PAi + 1 can be a dark sub-pixel and the sub-pixel PBi + 1 can be a bright sub-pixel.

According to the second configuration example, the liquid crystal panel 113a has a CS driver (retention capacitor line drive circuit) including a plurality of retention circuits (retention capacitor line drive internal circuits) on the glass substrate 1, and each CS line (retention capacitor). At the same time, outputs from the holding circuits are input to the wiring) as CS signals (retention capacitor wiring signals). According to this configuration, since the arrival time of the CS signal in the CS line can be reduced, the distribution (nonuniformity) of the pixel potential due to the difference between the target potential and the arrival potential in one CS line can be reduced. Display quality can be improved. Further, since the holding circuit can be configured by four TFTs as shown in FIG. 11, the circuit configuration can be simplified. Further, since the wiring for transmitting the signals SEL1, SEL2, VDD, and VSS for driving the holding circuit may be thin, an area occupied on the substrate of the holding circuit can be reduced. The reason why these wirings may be thin is that, due to the circuit configuration, the line capacitance of the selection wiring 46a and the selection wiring 46b for transmitting the signals SEL1 and SEL2 can be reduced, and the signals SEL1 and SEL2 are in the blanking period. This is because the potential is changed only in the case of VDD and VSS may be constant.

Therefore, according to the second configuration example, since the circuit and the wiring for supplying the CS signal to the CS line can be manufactured with a small occupied area, the frame of the liquid crystal display device can be reduced.

Note that the CS driver 49 of Configuration Example 2 and the CS driver 46 of Configuration Example 1 described above are formed integrally (monolithically) on the glass substrate 1. In such a case, since the holding circuit (CSDi-1 or the like) constituting the CS driver includes a transistor having a large channel width, a defect such as a film residue is more likely to occur than a pixel transistor. Easy to influence rate. In this regard, since the CS driver 46 of the configuration example 1 described above has a smaller number of holding circuits than the CS driver 49 of the configuration example 2, the reduction in the yield rate in the manufacturing process due to the provision of the CS driver is suppressed. And the area occupied by the CS driver can be reduced. For this reason, the liquid crystal display device 110 of the present invention is more advantageous for narrowing the frame than the CS driver 49 of Configuration Example 2 provided with the CS driver 46 of Configuration Example 1.

On the other hand, the CS driver 49 of the configuration example 2 and the CS driver 46 of the configuration example 1 described above are formed and integrated with the gate driver on a semiconductor substrate or the like for forming the gate driver. The gate / CS driver may be mounted on a polyimide film. According to this configuration, the non-defective rate of the gate / CS driver is hardly affected by the number of holding circuits in the CS driver, and compared with the case where the CS driver is formed on the glass substrate, the non-defective rate of manufacturing the liquid crystal panel. Can be improved. Therefore, in addition to improving the display quality of the liquid crystal display device and narrowing the frame, it is preferable to adopt the above-described configuration in order to improve the manufacturing quality rate of the liquid crystal panel. In particular, the above configuration is suitable for the CS driver 49 like the present configuration example 2 having a large number of holding circuits.

(Configuration example 3 of CS driver)
FIG. 23 is a circuit diagram showing a configuration example 3 of the gate / CS driver 50 in the liquid crystal display device 110 of the present invention. For convenience, the same reference numerals are given to the same components as those in the first configuration example, and the description thereof is omitted. The gate driver 45 is mounted on the polyimide film using SOF (system on film) technology. The polyimide film is connected to the glass substrate 1 (see FIG. 8) with an ACF (anisotropic conductive film), and the wiring (not shown) in the polyimide film is connected to a gate terminal (not shown) on the glass substrate 1. ing. The gate driver 45 is composed of a gate driver IC (not shown), and may be divided and mounted on a plurality of polyimide films as shown in FIG. The CS driver 51 is integrally formed on the glass substrate 1. That is, the CS driver 51 is monolithically formed on an active matrix substrate 111 (see FIG. 8) using amorphous silicon as a transistor. The gate driver 45 and the CS driver 51 are provided in a row at both ends of the liquid crystal display device 110 (in FIG. 23, the left and right ends of the drawing). Note that the gate driver 45 may also be formed integrally (monolithically) on the glass substrate 1. Further, the gate driver 45 and the CS driver 51 may be formed integrally (monolithically) on the IC substrate. Since the two gate drivers 45 and CS drivers 51 provided at both ends of the liquid crystal display device 110 have the same configuration, only one gate driver 45 and CS driver 51 will be described below.

The CS driver 51 of the configuration example 3 includes a plurality of holding circuits provided every four CS lines, and one holding circuit is connected to two CS lines. Further, every other CS line is connected to the capacitor wiring trunk 47. Specifically, as shown in FIG. 23, the CS line CSLp is connected to the capacitor wiring trunk 47, the CS line CSLp + 1 is connected to the holding circuit CSDp + 3, the CS line CSLp + 2 is connected to the capacitor wiring trunk 47, and the CS line CSLp + 3. Is connected to the holding circuit CSDp + 3, the CS line CSLp + 4 is connected to the capacitor wiring trunk 47, the CS line CSLp + 5 is connected to the holding circuit CSDp + 7, the CS line CSLp + 6 is connected to the capacitor wiring trunk 47, and the CS line CSLp + 7 is connected to the holding circuit CSDp + 7. It is connected to the. Each CS line is connected to the holding circuit or the capacitor wiring trunk 47 at both ends.

In the following description, a holding circuit CSDp + 3 and the like will be described as an example of the holding circuit of the present invention, but the same applies to holding circuits in other stages.

FIG. 24 is a timing chart showing various signal waveforms in the pixel Pp + 1, the pixel Pp + 2, the pixel Pp + 3, and the pixel Pp + 4. Hereinafter, changes in the pixel potentials in the first frame will be described. In FIG. 24, p is a multiple of 4.

In the sub-pixel PAp + 1 in the pixel Pp + 1, since the potential of the CS line CSLp that is capacitively coupled is constant (COM), the potential written in the active period of the gate line GLp + 1 is held. In the subpixel PBp + 1, when the potential of the gate line GLp + 1 rises at time t2 + 1H, a positive side (plus polarity) data signal is supplied, and the potential of the subpixel PAp + 1 becomes plus polarity. When the potential of the gate line GLp + 1 falls at time t2 + 3H, the subpixel PBp + 1 enters a floating state, and then the potential of the gate line GLp + 6 rises, and the potential of the CS line CSLp + 1 changes to the high potential Vcsh. , Push up to the positive side. Thereby, the subpixel PAp + 1 is a dark subpixel, and the subpixel PBp + 1 is a bright subpixel.

In the sub-pixel PAp + 2 in the pixel Pp + 2, when the potential of the gate line GLp + 2 rises at time t2 + 2H, a positive side (plus polarity) data signal is supplied via the source line SLj, and the potential of the sub-pixel PAp + 2 becomes plus polarity. . When the potential of the gate line GLp + 2 falls at time t2 + 4H, the sub-pixel PAp + 2 enters a floating state. Thereafter, at time t2 + 6H, the potential of the gate line GLp + 6 rises, and the potential of the CS line CSLp + 1 changes to the high potential Vcsh. The potential of the subpixel PAp + 2 rises to the positive side. In the subpixel PBp + 2, since the potential of the CS line CSLp + 2 is constant, the potential written in the active period of the gate line GLp + 2 is held. Thereby, the sub-pixel PAp + 2 becomes a bright sub-pixel, and the sub-pixel PBp + 2 becomes a dark sub-pixel.

In the sub-pixel PAp + 3 in the pixel Pp + 3, since the potential of the CS line CSLp + 2 that is capacitively coupled is constant (COM), the potential written in the active period of the gate line GLp + 3 is held. In the subpixel PBp + 3, when the potential of the gate line GLp + 3 rises at time t2 + 3H, a positive side (plus polarity) data signal is supplied, and the potential of the subpixel PBp + 3 becomes plus polarity. When the potential of the gate line GLp + 3 falls at the time t2 + 5H, the subpixel PBp + 3 enters a floating state, and then the potential of the gate line GLp + 6 rises, and the potential of the CS line CSLp + 3 changes to the high potential Vcsh. , Push up to the positive side. Thereby, the sub-pixel PAp + 3 is a dark sub-pixel, and the sub-pixel PBp + 3 is a bright sub-pixel.

In the subpixel PAp + 4 in the pixel Pp + 4, when the potential of the gate line GLp + 4 rises at time t2 + 4H, a positive-side (plus polarity) data signal is supplied, and the potential of the subpixel PAp + 4 becomes plus polarity. When the potential of the gate line GLp + 4 falls at time t2 + 6H, the sub-pixel PAp + 4 enters a floating state, and then the potential of the gate line GLp + 6 rises and the potential of the capacitively coupled CS line CSLp + 3 changes to the high potential Vcsh. The subpixel PAp + 4 is pushed up to the positive side. In the subpixel PBp + 4, since the potential of the CS line CSLp + 4 is constant, the potential written in the active period of the gate line GLp + 4 is held. Thereby, the sub-pixel PAp + 4 becomes a bright sub-pixel, and the sub-pixel PBp + 4 becomes a dark sub-pixel.

Therefore, also in this configuration example 3, since the circuit and wiring for giving a signal to the CS line can be produced with a small occupied area, the frame of the liquid crystal panel and the liquid crystal display device including the same can be made small.

The CS driver 51 of the configuration example 3 includes a plurality of holding circuits provided every four CS lines, and one holding circuit is connected to two CS lines. The CS driver 51 may have one holding circuit connected to two or more CS lines.

Further, the CS driver 51 of the configuration example 3 is formed integrally (monolithically) on the glass substrate 1, but as a first modification, the CS driver 51 is formed on a semiconductor substrate or the like for forming a gate driver. The driver 51 is formed integrally with a gate driver, and the integrated gate / CS driver may be mounted on a polyimide film.

FIG. 25 shows an embodiment of the liquid crystal display device 110b according to the first modification of the third configuration example. As shown in the figure, the gate / CS driver 50 b is formed integrally (monolithically) on the same semiconductor substrate and mounted on the polyimide film 8. An output terminal (not shown) of the CS driver 51b in the gate / CS driver 50b is connected to the plurality of storage capacitor wirings 3 by a lead wiring 91 having a branch. This branching is performed in the peripheral area 7 in the vicinity of the display area 6. Here, since the lead-out wiring 91 has a branch, the number of the lead-out wirings 91 can be reduced, and the frame of the liquid crystal display device 110b can be effectively reduced. Since the yield rate of the gate / CS driver 50b using the semiconductor process is high, the yield rate of the liquid crystal display device can be improved as compared with the case where the CS driver is formed on the glass substrate.

Therefore, the first modification of the configuration example 3 as described above has the effect of improving the display quality, narrowing the frame, and improving the good manufacturing rate of the liquid crystal display device in the pixel division type liquid crystal display device using the capacitive coupling method. This is particularly useful.

(Configuration example 4 of CS driver)
FIG. 26 is a circuit diagram showing a configuration example 4 of the gate / CS driver 52 in the liquid crystal display device 110 of the present invention. For convenience, the same reference numerals are given to the same components as those in the first configuration example, and the description thereof is omitted. The gate driver 45 is mounted on the polyimide film using SOF (system on film) technology. The polyimide film is connected to the glass substrate 1 (see FIG. 8) with an ACF (anisotropic conductive film), and the wiring (not shown) in the polyimide film is connected to a gate terminal (not shown) on the glass substrate 1. ing. The gate driver 45 is composed of a gate driver IC (not shown), and may be divided and mounted on a plurality of polyimide films as shown in FIG. The CS driver 53 is integrally formed on the glass substrate 1. That is, the CS driver 53 is monolithically formed on an active matrix substrate 111 (see FIG. 8) using amorphous silicon as a transistor. The gate driver 45 and the CS driver 53 are provided in a row at both ends (the left and right ends in FIG. 26) of the liquid crystal display device 110, respectively. Note that the gate driver 45 may also be formed integrally (monolithically) on the glass substrate 1. Further, the gate driver 45 and the CS driver 53 may be formed integrally (monolithically) on the IC substrate. Since the two gate drivers 45 and the CS driver 53 provided at both ends of the liquid crystal display device 110 have the same configuration, only one gate driver 45 and the CS driver 53 will be described below.

Similarly to the above configuration example 1, in FIG. 26, i is described as an even number, and the signal COM supplied to the capacitor wiring trunk 47 is wired to the CS lines of even rows such as CSL0, CSL2, CSLi, and CSLm. Are simultaneously supplied from both ends. The odd number CS lines such as CSL1, CSL3, CSLi-1, and CSLm-1 have an internal circuit constituting the CS driver 53 represented by CSD1, CSD3, CSDi-1, CSDm-1, etc. Circuit; hereinafter, also referred to as “holding circuit”) is supplied simultaneously from both ends. That is, the holding circuit is provided corresponding to every other line (odd row) for all the CS lines. However, as another form, the holding circuit may be provided corresponding to every other line (even rows) for all CS lines. In the following description, the holding circuit CSDi-1 and the like will be described as an example of the holding circuit of the present invention, but the same applies to holding circuits in other stages.

The CS driver 53 includes a plurality of holding circuits, and includes terminals for receiving external signals SEL1, SEL2, SEL3, SEL4, VDD, and VSS, and includes a selection wiring 46a, a selection wiring 46b, and a selection wiring 46c. The above signals are received through the selection wiring 46d, the high potential side power supply line 46H, and the low potential side power supply line 46L, and the output (gate signal) of the gate driver 45 is received. For example, the holding circuit CSDi-1 includes terminals sel1 to sel4 (generically referred to as sel in FIG. 26) for receiving signals SEL1 to SEL4, VDD and VSS from the outside, vdd and vss, a selection wiring 46a, a selection wiring 46b, The above signals are received via the selection wiring 46c, the selection wiring 46d, the high potential side power supply line 46H, and the low potential side power supply line 46L. The holding circuit CSDi-1 includes input terminals s1 and s2. The input terminal s1 is connected to the gate line GLi + 2 and receives the output (gate signal) of the gate driver 45. The input terminal s2 is connected to the gate line GLi + 4 and receives the output (gate signal) of the gate driver 45. The output (CS signal) of the holding circuit CSDi-1 is input to the CS line CSLi-1 via the output terminal cs.

FIG. 27 is a circuit diagram showing a specific example of the holding circuit constituting the CS driver 53 in the present configuration example 4. Taking the holding circuit CSDi-1 as an example, the holding circuit CSDi-1 includes six transistors MS1, MS2, MT1, MT2, MG, and MH. Here, it is an amorphous silicon TFT formed on a glass substrate.

Terminals s1 (first input unit), s2, sel1 (second input unit), sel2 (third input unit), sel3 (fourth input unit), sel4 (fifth input unit), vdd of the holding circuit CSDi-1 , Vss are input signals S1, S2, SEL1 (holding target signal), SEL2 (holding target signal), SEL3 (second holding target signal), SEL4 (second holding target signal), VDD, and VSS, respectively. Then, the CS signal is output from the terminal cs.

The transistor MS1 has a gate electrode connected to the terminal s1 of the holding circuit CSDi-1, a source electrode connected to the terminal sel1 of the holding circuit CSDi-1, and a drain electrode connected to the node netC1. The transistor MG has a gate electrode connected to the node netC1, a source electrode connected to the terminal vdd, and a drain electrode connected to the output terminal cs.

The transistor MS2 has a gate electrode connected to the terminal s1 of the holding circuit CSDi-1, a source electrode connected to the terminal sel2 of the holding circuit CSDi-1, and a drain electrode connected to the node netC2. The transistor MH has a gate electrode connected to the node netC2, a source electrode connected to the output terminal cs, and a drain electrode connected to the terminal vss.

The transistor MT1 has a gate electrode connected to the terminal s2 of the holding circuit CSDi-1, a source electrode connected to the terminal sel3 of the holding circuit CSDi-1, and a drain electrode connected to the node netC1. The transistor MT2 has a gate electrode connected to the terminal s2 of the holding circuit CSDi-1, a source electrode connected to the terminal sel4 of the holding circuit CSDi-1, and a drain electrode connected to the node netC2.

FIG. 28 is a timing chart showing various signals input / output in the holding circuit CSDi-1. Here, the difference from FIG. 12 shown in the configuration example 1 will be mainly described.

S2 in FIG. 28 is a signal delayed by 2H from S1. Furthermore, the input signals SEL3 and SEL4 added in the present configuration example 4 have the same phase as SEL1 and SEL2, respectively, and alternately repeat a high potential state and a low potential state for each frame. When the high potential in SEL1 and SEL2 is Vselh1, the low potential is Vsel1, the high potential in SEL3 and SEL4 is Vselh2, and the low potential is Vsel2, Vselh1> Vselh2 and Vsel1 = Vcell2 are set. That is, SEL3 and SEL4 differ from SEL1 and SEL2 only in the potential in the high potential state. Although not shown, it is desirable that the timings at which the potentials of SEL3 and SEL4 change are set during a blanking period, which is a period during which no potential is written to the pixel electrode.

In the holding circuit of Configuration Example 4, roughly, when S2 becomes a high potential state at a time delayed by 2H from S1, the transistors MT1 and MT2 are turned on, whereby the potentials of the nodes netC1 and netC2 are changed. The operation of reducing the potential to SEL3 and SEL4 is performed.

Specifically, in the first and second frames that are continuous, in the first frame, when the potential of S1 changes from Vgl to Vgh at time t1, the transistors MS1 and MS2 are turned on, and the potentials of the nodes netC1 and netC2 Are directed to Vselh1 (high potential) and Vcell1 (low potential), respectively, and the state is maintained after the potential is reached. Next, at time t1 + 2H, the potential of S1 becomes Vgl and the potential of S2 becomes Vgh, so that the transistors MS1 and MS2 are turned off, the transistors MT1 and MT2 are turned on, and the signals SEL3 and SEL4 are applied to the nodes netC1 and netC2. Entered. As a result, the potential of the node netC1 is lowered from Vselh1 to Vselh2 and held.

In the second frame, at time t1 + 1F, when the potential of S1 changes from Vgl to Vgh, the transistors MS1 and MS2 are turned on, and the potentials of the nodes netC1 and netC2 are directed toward Vcell1 (low potential) and Vselh1 (high potential), respectively. The state is maintained after reaching the potential. Next, at time t1 + 1F + 2H, the potential of S1 becomes Vgl and the potential of S2 becomes Vgh, so that the transistors MS1 and MS2 are turned off, the transistors MT1 and MT2 are turned on, and the signals SEL3 and SEL4 are supplied to the nodes netC1 and netC2. Entered. As a result, the potential of the node netC2 is lowered from Vselh1 to Vselh2 and held.

The change in the potentials of the nodes netC1 and netC2 is related to the operation reliability (threshold stability) of the transistors in the CS driver.

FIG. 30 is a graph showing the operational reliability of the amorphous silicon TFT (a-Si TFT) used in this embodiment. The test method used here is generally called a transistor bias temperature stress test (BTS test). As a test method, a method of alternately applying a long-time stress application and a short-time characteristic measurement under a predetermined environmental temperature was adopted. In the stress application, as shown in FIG. 29A, the stress voltage applied to the gate electrode G of the transistor is DC (direct current), the drain electrode D is 0 V (GND), and the source electrode S is 0.1 V in voltage. A voltage of V stress was applied to the gate electrode. In the characteristic measurement, as shown in FIG. 29B, the drain electrode D was set to 0 V (GND), the source electrode S was swept at a voltage of 10 V, and the gate electrode G was swept within a range of Vg = −20 to 30 V. Note that both stress application and characteristic measurement were performed in a dark room at an environmental temperature of 25 ° C.

FIG. 30 shows the result of examining the threshold shift of the transistor, which is particularly remarkable in the amorphous silicon TFT. 30A shows the result in the case of positive bias stress (positive bias applied to the gate electrode), and FIG. 30B shows the result in the case of negative bias stress (negative bias applied to the gate electrode). ing. In both cases, the horizontal axis represents the stress time (sec: second), and the vertical axis represents the threshold shift amount (change amount) (V) from before the stress application. The threshold shift is particularly noticeable in the case of a positive bias stress. When V stress is +5 V, the shift amount is smaller than the others, but as the V stress increases, the shift amount increases. The larger the threshold shift amount, the lower the operation reliability. This indicates that suppressing the voltage applied to the gate electrode of the transistor on the average improves the operation reliability of the transistor. . Further, the threshold value shifts in the opposite direction to the positive bias stress in the negative bias stress, but the magnitude is much smaller than the positive bias stress. This indicates that the operation reliability of the amorphous silicon TFT (a-Si TFT) is more likely to cause a decrease in operation reliability when the plus bias is applied than when the minus bias is applied.

In the above configuration examples 1 to 3, the gate electrodes of the transistors MG and MH provided in the holding circuit in the CS driver are connected to the nodes netC1 and netC2, respectively, and are alternately set to a constant high potential state every 1F (frame time) ( The positive bias state) and the low potential state (negative bias state) are repeated. In the CS drivers in the above configuration examples 1 to 3 and the present configuration example 4 as well, since amorphous silicon TFTs are used as transistors, it is necessary to consider the operational reliability especially in consideration of the potentials of the nodes netC1 and netC2.

From the result shown in FIG. 30, in the positive bias state, the lower the potential of the gate electrodes of the transistors MG and MH, that is, the potentials of the nodes netC1 and netC2, the better the reliability of operation of the CS driver. There is a concern that it takes longer time for CS to reach a predetermined voltage (Vcsh or Vcsl), which affects display quality. That is, the operational reliability and display quality of the CS driver are in a trade-off relationship.

In the CS driver 53 of the above configuration example 4, in each positive bias state, the potentials of the nodes netC1 and netC2 are two stages, and these potentials are lowered from the middle. When the output from the holding circuit (CS signal) reaches a predetermined voltage to some extent, the potential is lowered in the middle to lower the average potential of the nodes netC1 and netC2 in each positive bias state, and the operation of the CS driver Reliability can be increased. This was verified by circuit simulation (SPICE simulation) using an electronic computer.

FIG. 31 is a diagram for explaining the outline of the simulation circuit. The simulation circuit 61 includes a circuit unit 62 that generates a voltage source and a signal source, a holding circuit unit 63, and a load unit 64. The load section 64 has a resistance R0 of 50Ω and a capacitance C0 of 50 pF connected in 10 stages as shown in the figure, and assumes a value assuming a CS line of a large liquid crystal display device. In this simulation, only one holding circuit unit is provided, which directly corresponds to the fact that the holding circuit unit is provided on one side in an actual liquid crystal display device. However, since this simulation relatively evaluates the reliability of various holding circuits under the same setting conditions, it can be applied even when there are holding circuit portions on both sides of the liquid crystal display device.

As the input waveforms, considering the rounding of waveforms, S1 and S2 are models that linearly change from 0% to 100% or from 100% to 0% in 1 μs as shown in FIG. Other main simulation conditions are as follows. Similar numerical values were used in the simulation of the configuration example 1 as a reference (REF). As the TFT characteristics, the characteristics of the amorphous silicon TFT produced by the method shown in the configuration example 1 of the present invention are used by making a SPICE model. The saturation mobility of the amorphous silicon TFT used here is about 0.4 cm ² / Vs.
<Simulation conditions in Configuration Example 4>
1H (horizontal scanning period): 7.4 μs
1F (frame): 8.3 ms
-Channel length L of transistors MG, MH, MS1, MS2, MT1, MT2: all 4 μm
・ Channel width of transistors MG and MH: 7000 μm each
-Channel width of transistors MS1 and MS2: 50 μm each
-Channel width of transistors MT1 and MT2: 50 μm each
・ Vselh1: 35V
・ Vcell1: -6V
・ Vselh2: condition (influence on average potential of nodes netC1 and netC2)
・ Vcell2: -6V
・ Vgh: 35V
・ Vgl: -6V
・ Vcsh: 9.7V
・ Vcsl: 5.7V
COM (potential of counter electrode): 7.7V
<Simulation conditions in REF (Configuration Example 1)>
・ Vselh: condition (influence on average potential of nodes netC1 and netC2)
・ Vcell: -6V
Vselh1, Vsel1, Vselh2, and Vcell2 are not used. Others are the same as in Configuration Example 4. In Configuration Example 4, Vselh2 is used for Vselh2 and in REF (Configuration Example 1), and the results of simulation are shown in Table 1.

Using the results of Table 1, FIG. 33 shows the relationship between the average potential of the nodes netC1 and netC2 and the arrival time of the output potential. The potential changes of the nodes netC1 and netC2 are 180 ° out of phase with each other, and the positive bias state and the negative bias state are alternately switched every 1F (frame time).

FIG. 33 shows the relationship between the average potential and the output potential arrival time when the node netC1 or netC2 is in the positive bias state. Here, the average potential is a value obtained by averaging the potential of the node netC1 or netC2 over a time period during which a positive bias is applied to the node netC1 or netC2 (approximately one frame time). The arrival time is defined as the time required for the potential of the output CS signal to reach 99% from COM (the potential of the counter electrode).
(Vcsh−Vcom) × 0.99 + Vcom (netC1)
Or
(Vcsl−Vcom) × 0.99 + Vcom (netC2)
Defined as the time to become. When the node netC1 is in the positive bias state, the output signal CS moves in a direction in which the potential is increased. When the node netC2 is in the positive bias state, the CS signal moves in a state in which the potential is lowered. Is different. Note that Vcom is COM (the potential of the counter electrode). The CS signal is monitored immediately after the output of the holding circuit 63 in FIG.

FIG. 33 shows the relationship between the configuration example 4 and the configuration example 1 for each of the nodes netC1 and netC2. However, the configuration example 4 is better for both the nodes netC1 and netC2. In the case of the configuration example 4, the average voltage of the node netC1 or the netC2 is lowered with respect to the predetermined arrival time. For example, the average voltage of the node netC1 or netC2 can be lowered by about 1 V in the configuration example 4 compared to the configuration example 1 even when the arrival time is 200 μs.

In the fourth configuration example, the average voltage of the nodes netC1 and netC2 can be lowered in this way because the potentials of the nodes netC1 and netC2 are lowered in the middle in the respective positive bias states. Immediately after the nodes netC1 and netC2 are in the positive bias state, a relatively high potential is applied to the nodes netC1 and netC2 in order to change the CS signal quickly. By providing a relatively low potential to netC1 and netC2, the arrival time can be shortened efficiently. Therefore, even in the same arrival time, the average potential of the nodes netC1 and netC2 in each positive bias state can be lowered, and the operation reliability of the holding circuit and the CS driver can be improved. Therefore, it can be seen that the operational reliability of the CS driver of Configuration Example 4 can be improved. Therefore, even when an amorphous silicon TFT is used as a transistor, display quality and operation reliability can be improved, and the frame of the liquid crystal display device can be reduced.

(CS Driver Configuration Example 5)
FIG. 34 is a circuit diagram showing Configuration Example 5 of the gate / CS driver 54 in the liquid crystal display device 110 of the present invention. The configuration example 5 differs from the configuration example 4 in a mechanism for lowering the potentials of the nodes netC1 and netC2 in the plus bias state. For convenience, the same reference numerals are given to the same components as those in the first to fourth configuration examples, and the description thereof is omitted. The gate driver 45 is mounted on the polyimide film using SOF (system on film) technology. The polyimide film is connected to the glass substrate 1 (see FIG. 8) with an ACF (anisotropic conductive film), and the wiring (not shown) in the polyimide film is connected to a gate terminal (not shown) on the glass substrate 1. ing. The gate driver 45 is composed of a gate driver IC (not shown), and may be divided and mounted on a plurality of polyimide films as shown in FIG. The CS driver 55 is integrally formed on the glass substrate 1. That is, the CS driver 55 is monolithically formed on an active matrix substrate 111 (see FIG. 8) using amorphous silicon as a transistor. Each of the gate driver 45 and the CS driver 55 is provided in a row at both ends of the liquid crystal display device 110 (in FIG. 34, left and right ends on the paper surface). Note that the gate driver 45 may also be formed integrally (monolithically) on the glass substrate 1. Further, the gate driver 45 and the CS driver 55 may be formed integrally (monolithically) on the IC substrate. Since the two gate drivers 45 and CS drivers 55 provided at both ends of the liquid crystal display device 110 have the same configuration, only one gate driver 45 and CS driver 55 will be described below.

The CS driver 55 includes a plurality of holding circuits provided every other line (even rows or odd rows). The CS driver 55 includes terminals for receiving signals SEL1, SEL2, VDD, and VSS from the outside, and each of the above-described components via the selection wiring 46a, the selection wiring 46b, the high potential side power supply line 46H, and the low potential side power supply line 46L. Receive a signal. For example, the holding circuit CSDi-1 includes terminals sel1, sel2, vdd, and vss for receiving signals SEL1, SEL2, VDD, and VSS from the outside, and includes a selection wiring 46a, a selection wiring 46b, a high-potential side power supply line 46H, The above signals are received via the potential side power supply line 46L. The holding circuit CSDi-1 includes input terminals s1 and s2. The input terminal s1 is connected to the gate line GLi + 2 and receives the output (gate signal) of the gate driver 45. The input terminal s2 is connected to the gate line GLi + 4 and receives the output (gate signal) of the gate driver 45. The output (CS signal) of the holding circuit CSDi-1 is input to the CS line CSLi-1 via the output terminal cs. Note that the CS line CSLi-1 has both ends connected to the holding circuits CSDi-1 of the CS drivers 55 provided at both ends of the liquid crystal display device 100, respectively. Are simultaneously supplied with the output (CS signal) of each holding circuit CSDi-1 from both ends thereof.

FIG. 35 is a circuit diagram showing a specific example of the holding circuit constituting the CS driver 55 in the present configuration example 5. Taking the holding circuit CSDi-1 as an example, the holding circuit CSDi-1 includes eight transistors MS1, MS2, MG, MH, MT1, MT2, MU1, and MU2. Here, it is an amorphous silicon TFT formed on a glass substrate.

The terminals s1 (first input unit), s2, sel1 (second input unit), sel2 (third input unit), vdd, and vss of the holding circuit CSDi-1 are respectively supplied with external signals S1, S2, and SEL1 (holding). Target signal), SEL2 (holding target signal), VDD, and VSS are input, and a CS signal is output from the terminal cs.

The transistor MS1 has a gate electrode connected to the terminal s1 of the holding circuit CSDi-1, a source electrode connected to the terminal sel1 of the holding circuit CSDi-1, and a drain electrode connected to the node netC1. The transistor MG has a gate electrode connected to the node netC1, a source electrode connected to vdd, and a drain electrode connected to the output terminal cs.

The transistor MT1 has a gate electrode connected to the terminal s2 of the holding circuit CSDi-1, a source electrode connected to the terminal sel1 of the holding circuit CSDi-1, and a drain electrode connected to the node netC1 and the source electrode of the transistor MU1. .

The transistor MT2 has a gate electrode connected to the terminal s2 of the holding circuit CSDi-1, a source electrode connected to the terminal sel2 of the holding circuit CSDi-1, and a drain electrode connected to the node netC2 and the source electrode of the transistor MU2. .

The transistor MU1 has a gate electrode connected to the terminal s2 of the holding circuit CSDi-1, a source electrode connected to the drain electrode of the transistor MT1 and the node netC1, and a drain electrode connected to the drain electrode of the transistor MH and the terminal vss. .

The transistor MU2 has a gate electrode connected to the terminal s2 of the holding circuit CSDi-1, a source electrode connected to the drain electrode of the transistor MT2 and the node netC2, and a drain electrode connected to the drain electrode of the transistor MH and the terminal vss. .

FIG. 36 is a timing chart showing various signals input / output in the holding circuit CSDi-1. Here, the difference from FIG. 12 shown in the configuration example 1 will be mainly described.

In the holding circuit of Configuration Example 5, generally, the transistors MT1, MT2, MU1, and MU2 are turned on when S2 is in a high potential state at a time delayed by 2H from S1, thereby the nodes netC1, An operation of lowering the potential of netC2 is performed.

Specifically, in the first and second frames that are continuous, in the first frame, when the potential of S1 changes from Vgl to Vgh at time t1, the transistors MS1 and MS2 are turned on, and the potentials of the nodes netC1 and netC2 Are directed to Vselh1 (high potential) and Vcell1 (low potential), respectively, and the state is maintained after the potential is reached. Next, since S2 becomes Vgh at time t1 + 2H, the transistors MT1, MT2, MU1, and MU2 are turned on, and the nodes netC1 and netC2 are electrically connected to VSS. As a result, the potential of the node netC1 is lowered from Vselh1 to Vselh1 'and held.

In the second frame, at time t1 + 1F, when the potential of S1 changes from Vgl to Vgh, the transistors MS1 and MS2 are turned on, and the potentials of the nodes netC1 and netC2 are directed toward Vcell1 (low potential) and Vselh1 (high potential), respectively. The state is maintained after reaching the potential. Next, at time t1 + 1F + 2H, since S2 becomes Vgh, the transistors MT1, MT2, MU1, and MU2 are turned on, and the nodes netC1 and netC2 are electrically connected to VSS. As a result, the potential of the node netC2 is lowered from Vselh1 to Vselh1 'and held.

The simulation in Configuration Example 5 was performed in the same manner as in Configuration Example 4. The simulation conditions in Configuration Example 5 are as follows.
<Simulation conditions in Configuration Example 5>
1H (horizontal scanning period): 7.4 μs
1F (frame): 8.3 ms
-Channel length L of transistors MG, MH, MS1, MS2, MT1, MT2, MU1, and MU2: all 4 μm
・ Channel width of transistors MG and MH: 7000 μm each
-Channel width of transistors MS1 and MS2: 50 μm each
-Channel widths of the transistors MT1 and MT2: conditions (influencing the average potential of the nodes netC1 and netC2)
-Channel widths of transistors MU1 and MU2: conditions (influence on average potential of nodes netC1 and netC2)
・ Vselh1: 35V
・ Vcell1: -6V
・ Vgh: 35V
・ Vgl: -6V
・ Vcsh: 9.7V
・ Vcsl: 5.7V
COM (potential of counter electrode): 7.7V
<Simulation conditions in REF (Configuration Example 1)>
・ Vselh: condition (influence on average potential of nodes netC1 and netC2)
・ Vcell: -6V
・ Vselh1, Vsel1, Vselh2, and Vcell2 are not used. ・ Similar to REF (Configuration Example 1) shown in Configuration Example 4. Simulation is performed by changing the channel width of transistors MT1 and MT2 and the channel width of transistors MU1 and MU2. The results are summarized in Table 2.

Using the results in Table 2, FIG. 37 shows the relationship between the average potentials of the nodes netC1 and netC2 and the output potential arrival time, as in FIG.

FIG. 37 shows the relationship between the configuration examples 5 and REF (configuration example 1) for each of the nodes netC1 and netC2. However, in both cases of the nodes netC1 and netC2, the case of the configuration example 5 is shown. Tends to be plotted on the left side of the configuration example 1, that is, in the case of the configuration example 5, the average voltage of the node netC1 or netC2 is lowered with respect to a predetermined arrival time. Become. For example, the average voltage of the node netC1 or netC2 can be lowered by about 1 V in the configuration example 5 compared to the configuration example 1 even when the arrival time is 200 μs.

As shown in FIG. 37, according to the present configuration example 5, the operational reliability of the CS driver can be improved as in the above configuration example 4. Further, in the present configuration example 5, since SEL3 and SEL4 that are necessary in the configuration example 4 are not required as signals input to the holding circuit, the frame in the liquid crystal display device can be further reduced. Therefore, even when an amorphous silicon TFT is used as a transistor, display quality and operation reliability can be improved, and the frame of the liquid crystal display device can be reduced.

(Configuration example 6 of CS driver)
FIG. 38 is a circuit diagram showing Configuration Example 6 of the gate / CS driver 56 in the liquid crystal display device 110 of the present invention. The configuration example 6 differs from the configuration example 5 in the timing of lowering the potentials of the nodes netC1 and netC2 in the plus bias state. For convenience, the same reference numerals are given to the same components as those in the first to fifth configuration examples, and the description thereof is omitted. The gate driver 45 is mounted on the polyimide film using SOF (system on film) technology. The polyimide film is connected to the glass substrate 1 (see FIG. 8) with an ACF (anisotropic conductive film), and the wiring (not shown) in the polyimide film is connected to a gate terminal (not shown) on the glass substrate 1. ing. The gate driver 45 is composed of a gate driver IC (not shown), and may be divided and mounted on a plurality of polyimide films as shown in FIG. The CS driver 57 is integrally formed on the glass substrate 1. That is, the CS driver 57 is monolithically formed on an active matrix substrate 111 (see FIG. 8) using amorphous silicon as a transistor. The gate driver 45 and the CS driver 57 are provided in a row at both ends of the liquid crystal display device 110 (in FIG. 38, the left and right ends of the page). Note that the gate driver 45 may also be formed integrally (monolithically) on the glass substrate 1. Further, the gate driver 45 and the CS driver 57 may be integrally formed (monolithic) on the IC substrate. Since the two gate drivers 45 and the CS driver 57 provided at both ends of the liquid crystal display device 110 have the same configuration, only one gate driver 45 and the CS driver 57 will be described below.

The CS driver 57 includes a plurality of holding circuits provided every other line (even rows or odd rows). The CS driver 57 includes terminals for receiving signals SEL1, SEL2, VDD, and VSS from the outside. The CS driver 57 is connected via the selection wiring 46a, the selection wiring 46b, the high potential side power supply line 46H, and the low potential side power supply line 46L. Receive each signal. For example, the holding circuit CSDi-1 includes terminals sel1, sel2, vdd, and vss for receiving signals SEL1, SEL2, VDD, and VSS from the outside, and includes a selection wiring 46a, a selection wiring 46b, a high-potential side power supply line 46H, The above signals are received via the potential side power supply line 46L. The holding circuit CSDi-1 includes input terminals s1 and s2. The input terminal s1 is connected to the gate line GLi + 2 and receives the output (gate signal) of the gate driver 45. The input terminal s2 is connected to the gate line GLi + 6 and receives the output (gate signal) of the gate driver 45. The output (CS signal) of the holding circuit CSDi-1 is input to the CS line CSLi-1 via the output terminal cs. The CS line CSLi-1 is connected to the holding circuit CSDi-1 of each CS driver 57 provided at both ends of the liquid crystal display device 100, respectively, so that the CS line CSLi-1 Are simultaneously supplied with the output (CS signal) of each holding circuit CSDi-1 from both ends thereof.

FIG. 39 is a circuit diagram showing a specific example of the holding circuit constituting the CS driver 57 in the present configuration example 6. Taking the holding circuit CSDi-1 as an example, the holding circuit CSDi-1 includes eight transistors MS1, MS2, MG, MH, MT1, MT2, MU1, and MU2. Here, it is an amorphous silicon TFT formed on a glass substrate.

FIG. 40 is a timing chart showing various signals input / output in the holding circuit CSDi-1. Here, the difference from FIG. 12 shown in the configuration example 1 will be mainly described.

In the holding circuit of Configuration Example 6, generally, the transistors MT1, MT2, MU1, and MU2 are turned on when S2 becomes a high potential state at a time delayed by 2H from S1, thereby the nodes netC1, An operation of lowering the potential of netC2 is performed.

Specifically, in the first and second frames that are continuous, in the first frame, when the potential of S1 changes from Vgl to Vgh at time t1, the transistors MS1 and MS2 are turned on, and the potentials of the nodes netC1 and netC2 Are directed to Vselh1 (high potential) and Vcell1 (low potential), respectively, and the state is maintained after the potential is reached. Next, at time t1 + 4H, since S2 changes from Vgl to Vgh, the transistors MT1, MT2, MU1, and MU2 are turned on, and the nodes netC1 and netC2 are electrically connected to VSS. As a result, the potential of the node netC1 is lowered from Vselh1 to Vselh1 'and held.

In the second frame, at time t1 + 1F, when the potential of S1 changes from Vgl to Vgh, the transistors MS1 and MS2 are turned on, and the potentials of the nodes netC1 and netC2 are directed toward Vcell1 (low potential) and Vselh1 (high potential), respectively. The state is maintained after reaching the potential. Next, at time t1 + 1F + 4H, since S2 changes from Vgl to Vgh, the transistors MT1, MT2, MU1, and MU2 are turned on, and the nodes netC1 and netC2 are electrically connected to VSS. As a result, the potential of the node netC2 is lowered from Vselh1 to Vselh1 'and held.

Table 3 summarizes the results of simulations under conditions of the channel widths of the transistors MT1 and MT2 and the channel widths of the transistors MU1 and MU2.

Using the results in Table 3, FIG. 41 shows the relationship between the average potential of the nodes netC1 and netC2 and the output potential arrival time, as in FIG. The simulation conditions in the configuration example 6 are the same as those in the configuration example 5.

FIG. 41 shows the relationship between the configuration examples 6 and REF (configuration example 1) for each of the nodes netC1 and netC2. However, in both cases of the nodes netC1 and netC2, the case of the configuration example 6 is shown. Tends to be plotted on the left side of the configuration example 1, that is, in the case of the configuration example 6, the average voltage of the node netC1 or netC2 is lowered for a predetermined arrival time. Become. For example, the average voltage of the node netC1 or netC2 can be reduced by about 2V in the configuration example 6 compared to the configuration example 1 even when the arrival time is 200 μs.

As shown in FIG. 41, according to the present configuration example 6, the operational reliability of the CS driver can be improved as in the above configuration examples 4 and 5. Further, in the present configuration example 6, compared to the configuration examples 4 and 5, the average voltage of the node netC1 or netC2 can be lowered even in the same arrival time, and thus the reliability of the CS driver is further improved.

For this reason, in the configuration example 6, the potential drop timings of the nodes netC1 and netC2 are delayed by 2H from the case of the configuration example 5. As a result, the high potential period of the nodes netC1 and netC2 immediately after the nodes netC1 and netC2 are in the positive bias state is lengthened, and the arrival time of the output potential is shortened. On the other hand, the influence on the average potential at this time is only slightly increased because the time of one frame is very long. Therefore, the same arrival time can be obtained with a lower average potential. Therefore, according to the present configuration example 6, the operational reliability of the CS driver can be improved as compared with the configuration example 5. Therefore, even when an amorphous silicon TFT is used as a transistor, display quality and operation reliability can be improved, and the frame of the liquid crystal display device can be reduced.

As shown in the configuration example 6, in the positive bias state, the timing for lowering the potentials of the nodes netC1 and netC2 can be arbitrarily determined within a predetermined range.

Note that as a modification of the configuration examples 4 to 6, the potentials of the nodes netC1 and netC2 in the plus bias state may be lowered in multiple stages or continuously, instead of in two stages, and the holding circuit, CS The operation reliability of the driver can be improved.

By the way, the configuration (configuration examples 1 to 6) of each CS driver described above is not limited to the liquid crystal panel (configuration example 1) as shown in FIGS. 1 and 2, but can be applied to various forms of liquid crystal panels. Can do. Hereinafter, other configuration examples (configuration examples 7 and 8) of the present liquid crystal panel will be described.

(Configuration example 7 of liquid crystal panel)
FIG. 42 is an equivalent circuit diagram showing a part of the liquid crystal panel 113c in the configuration example 7 of the liquid crystal panel of the present invention. The difference between the liquid crystal panel 113c of FIG. 42 and the liquid crystal panel 113a of FIG. 1 is that two data signal lines are provided corresponding to one pixel column, and pixels adjacent to each other in the column direction are connected to different data signal lines. The other points are the same. Further, in the present liquid crystal panel 113c, one data signal line and one scanning signal line are provided corresponding to one pixel, and a storage capacitor line shared between adjacent pixels in the column direction is provided. have.

First, the structure of each pixel will be described using the pixel 101 as an example.

In the pixel 101, the pixel electrode 5a (first pixel electrode) is connected to the data signal line 4y (second data signal line) via the transistor 15a (first transistor) connected to the scanning signal line 2ab. 5b (second pixel electrode) is connected to the data signal line 4y (second data signal line) via the transistor 15b (second transistor) connected to the scanning signal line 2ab, and the pixel electrode 5a and the storage capacitor line 3x. A storage capacitor Cha is formed between the pixel electrode 5b and the storage capacitor wiring 3y, a storage capacitor Chb is formed between the pixel electrode 5a and the common electrode com, and a liquid crystal capacitor Cla is formed between the pixel electrode 5b and the common electrode com. A liquid crystal capacitor Clb is formed.

Next, the

pixels

100 and 102 adjacent to the pixel 101 in the column direction (up and down direction on the paper surface) will be described. The formation of the storage capacitor and the liquid crystal capacitor is the same as that of the pixel 101, but each

pixel electrode

5c, 5d, 5e 5f is connected to the data signal line 4x (first data signal line) via the

respective transistors

15c, 15d, 15e, and 15f. In this way, the data signal lines to be connected are alternately switched in pixels adjacent in the column direction.

Further, each of the

pixel electrodes

5a and 5b of the pixel 101 forms a different

storage capacitor wiring

3x and 3y and a storage capacitor Cha and Chb, respectively. Therefore, for example, after writing respective data signals to the

pixel electrodes

5a and 5b, different holding capacitor wiring signals are supplied to the holding

capacitor wirings

3x and 3y to increase the pixel electrode potential (pixel potential) by capacitive coupling or By performing the push-down, the pixel potentials (effective voltages) of the

pixel electrodes

5a and 5b can be made different. By using such a method, for example, a subpixel including the pixel electrode 5a can be a positive subpixel having a positive polarity, and a subpixel including the pixel electrode 5b can be a dark subpixel having a negative polarity. Thus, a pixel division type liquid crystal display device can be realized.

For the signals of adjacent data signal lines, the polarity of the data signal supplied to the data signal line is inverted every frame period, and two data signals corresponding to the same pixel column are used in the same horizontal scanning period. If a data signal having a reverse polarity is supplied to the two adjacent

data signal lines

4y and 4X while supplying a data signal having a reverse polarity to the

lines

4x and 4y, the column direction (up and down direction on the paper surface), the row direction (paper surface) Since the polarities of pixels adjacent to each other in the left-right direction are opposite to each other, so-called dot inversion driving is performed to improve display quality. However, basically, in this embodiment, the polarity arrangement of the signal of the data signal line may be any.

FIG. 43 shows a specific configuration of the liquid crystal panel 113c in Configuration Example 7. FIG. 43 is a plan view showing Configuration Example 7 of the liquid crystal panel 113c. 43, data signal

lines

4x and 4y are provided along the left and right of the pixel 100 and the pixel 101, and data signal

lines

4X and 4Y are provided along the left and right of the pixel 103 and the pixel 104. A storage capacitor wiring 3w is provided so as to overlap with one of the edge portions of the

pixels

100 and 103, and a storage capacitor wiring 3x is provided so as to overlap with the other of the edge portions of the

pixels

100 and 103 and one of the edge portions of the

pixels

101 and 104. The storage capacitor wiring 3y is provided so as to overlap the other of the edge portions of the

pixels

101 and 104. In addition, a scanning signal line 2cd is arranged so as to cross the central part of the

pixels

101, 104.

Further, in a plan view, in the pixel 100, the

pixel electrodes

5c and 5d are arranged in the column direction between the

storage capacitor lines

3w and 3x, and in the pixel 101, the

pixel electrodes

5a and 5b are arranged between the

storage capacitor lines

3x and 3y. In the pixel 103, the

pixel electrodes

5C and 5D are arranged in the column direction between the

storage capacitor lines

3w and 3x. In the pixel 104, the

pixel electrodes

5A and 5B are arranged in the column direction between the

storage capacitor lines

3x and 3y. Are listed.

In the pixel 101, the source electrode 16ab and the drain electrode 17a of the transistor 15a and the source electrode 16ab and the drain electrode 17b of the transistor 15b are formed on the scanning signal line 2ab. In this way, the source electrode 16ab is connected to the data signal line 4y also serving as both source electrodes of the

transistors

Here, the capacitor electrode 19a overlaps the storage capacitor wiring 3x via the gate insulating film, and the pixel electrode 5a overlaps the storage capacitor wiring 3x via the gate insulating film and the interlayer insulating film. A storage capacitor Cha (see FIG. 42) is formed. Similarly, the capacitor electrode 19b overlaps the storage capacitor wiring 3y via the gate insulating film, and the pixel electrode 5b overlaps the storage capacitor wiring 3y via the gate insulating film and the interlayer insulating film. A storage capacitor Chb (see FIG. 42) is formed.

The configuration of other pixels (the shape, arrangement, and connection relationship of each member) is the same as that of the pixel 101. However, as described above, the connection between the data signal line and the pixel electrode is either left or right. .

In the present embodiment, the CS driver and the holding circuit may be any of the CS driver and the holding circuit in the above configuration examples 1 to 6, respectively.

The present liquid crystal panel 113c is suitable for a high-speed driving panel having a frame rate of 240 Hz (4 × speed), 360 Hz (6 × speed), and the like, and is also suitable for a 3D liquid crystal display device that performs 3D (stereoscopic) image display using the panel.

The arrangement of pixel electrodes and data signal lines as shown in FIG. 42 or FIG. 43, that is, two data signal lines are provided for one pixel column arranged in the column direction, and adjacent pixels in the column direction are alternately left and right. The arrangement in which the data signal is obtained from the data signal line is selected by selecting two scanning signal lines at the same time in driving and sequentially scanning, so that each pixel is compared with the case where the scanning signal lines are sequentially scanned one by one. It is known that the time for charging the electrode to the potential of the data signal line (pixel charging time) can be doubled. Therefore, the pixel is not insufficiently charged, and such an arrangement of the pixel electrode and the data signal line is suitable for the above-described high-speed drive panel.

If such an arrangement is applied to, for example, a liquid crystal panel having a pixel division method based on a capacitance division method, the frame is greatly increased. The reason is that in the conventional capacity division system, a large number of storage capacitor wirings are connected to the storage capacitor wiring trunk and an AC (alternating current) signal is transmitted, so that signal delay in the storage capacitor wiring trunk is likely to occur. This is because it has a large effect on display, and if it is intended to cope with higher speed, the line width of the storage capacitor wiring trunk must be significantly increased.

However, if a liquid crystal panel having a pixel division method based on a capacitive division method is manufactured using a CS driver having a plurality of holding circuits as in the present configuration example 7, the AC (alternating current) signal is held so as to be transmitted. Since no capacity wiring trunk is used, the frame is hardly enlarged. Therefore, in the high-speed drive panel, the configuration example 7 is particularly effective in reducing the frame.

(Configuration example 8 of liquid crystal panel)
FIG. 44 is an equivalent circuit diagram showing a part of the liquid crystal panel 113d in the configuration example 8 of the liquid crystal panel of the present invention. As shown in FIG. 44, in the present liquid crystal panel 113d,

data signal lines

4x and 4X extending in the column direction (up and down direction in the figure),

scanning signal lines

2c and 2a extending in the row direction (left and right direction in the figure), and rows. And

pixels

100, 101, 103, 104 arranged in the column direction,

storage capacitor lines

3a, 3c, and a common electrode (counter electrode) com, and the structure of each pixel is the same.

In the present liquid crystal panel 113d, one data signal line, one scanning signal line, and one storage capacitor line are provided corresponding to one pixel. In addition, one pixel includes two pixel electrodes, one of which surrounds the other, the pixel 100 includes a pixel electrode 5d and a pixel electrode 5c surrounding the pixel electrode, and the pixel 101 includes the pixel electrode 5b and A pixel electrode 5a surrounding the pixel electrode 5a and a pixel electrode 5C surrounding the pixel electrode 5D are provided. The pixel 104 includes a pixel electrode 5B and a pixel electrode 5A surrounding the pixel electrode 5A. .

In the pixel 101, the pixel electrode 5a is connected to the data signal line 4x via the transistor 15a connected to the scanning signal line 2a, and the pixel electrode 5b is connected to the data signal via the transistor 15b connected to the scanning signal line 2a. The storage capacitor Cha is formed between the pixel electrode 5a and the storage capacitor wiring 3a, the liquid crystal capacitor Cla is formed between the pixel electrode 5a and the common electrode com, and the liquid crystal capacitor is connected between the pixel electrode 5b and the common electrode com. Clb is formed.

Thus, each of the

pixel electrodes

5a and 5b is connected to the same data signal line 4x via the

respective transistors

15a and 15b connected to the same scanning signal line 2ab, and thus the

pixel electrodes

transistors

15a and 15b. Since the pixel electrode 5a forms the storage capacitor line 3a and the storage capacitor Cha, for example, after writing a data signal to the

pixel electrodes

5a and 5b, the storage capacitor line signal is changed, thereby causing capacitive coupling. By raising or lowering the pixel electrode potential (pixel potential), the pixel potentials of the

pixel electrodes

5a and 5b can be made different. By using such a method, for example, the sub-pixel including the pixel electrode 5a can be a dark sub-pixel, and the sub-pixel including the pixel electrode 5b can be a bright sub-pixel. Thus, a pixel division type liquid crystal display device can be realized.

FIG. 45 shows a specific configuration of the liquid crystal panel 113d in the present configuration example 8. FIG. 45 is a plan view showing Configuration Example 8 of the liquid crystal panel 113d. In the liquid crystal panel 113d of FIG. 45,

transistors

15a and 15b are arranged in the vicinity of the intersection of the data signal line 4x and the scanning signal line 2a, and a rectangular pixel electrode is formed in the pixel region defined by the

data signal lines

4x and 4X. 5b and a rectangular pixel electrode 5a surrounding the same are arranged, and the storage capacitor wiring 3a extends in the row direction across the pixel electrode 5a. The shape of the

pixel electrodes

5a and 5b is not particularly limited as long as one pixel electrode surrounds the other pixel electrode.

In the pixel 101, the source electrode 16ab and the drain electrode 17a of the transistor 15a and the source electrode 16ab and the drain electrode 17b of the transistor 15b are formed on the scanning signal line 2a. In this manner, the source electrode 16ab is connected to the data signal line 4x also serving as both source electrodes of the

transistors

15a and 15b. The drain electrode 17a is connected to the drain lead wire 18a, the drain lead wire 18a is connected to the capacitor electrode 19a, and the capacitor electrode 19a is connected to the pixel electrode 5a through the contact hole 20a. The drain electrode 17b is connected to the drain lead wiring 18b, and the drain lead wiring 18b is connected to the pixel electrode 5b through the contact hole 20b.

Here, the capacitor electrode 19a overlaps the storage capacitor wiring 3a via the gate insulating film, and the pixel electrode 5a overlaps the storage capacitor wiring 3a via the gate insulating film and the interlayer insulating film. A storage capacitor Cha (see FIG. 44) is formed.

On the other hand, the pixel electrode 5b is not provided with a capacitor electrode or a storage capacitor wire, and is not provided with a storage capacitor by the storage capacitor wire. Since the pixel electrode 5b is a bright pixel, considering the VT curve (liquid crystal applied voltage-panel transmittance curve) of the liquid crystal panel, even if the potential of the pixel electrode 5b slightly changes between frames, the influence of the display luminance change Is difficult to appear. Further, in the present configuration example 8, since the storage capacitor using the storage capacitor wiring is not provided for one of the sub-pixels, the number of CS driver outputs (CS signals) can be reduced and the configuration of the CS driver can be simplified. It is more advantageous to narrow the frame.

Incidentally, each of the liquid crystal panels shown in the configuration examples 1 to 7 has a configuration in which each of a plurality of pixel electrodes formed in one pixel region forms a storage capacitor line and a storage capacitor. The present invention is not limited to this, and as shown in Structural Example 8, it is sufficient that at least one pixel electrode in one pixel electrode forms a storage capacitor line and a storage capacitor. For example, in a configuration in which two pixel electrodes (5a, 5b) are formed in one pixel region, only one pixel electrode (5a) forms a storage capacitor line and a storage capacitor. Also in this configuration, after a data signal is written to one of the pixel electrodes (5a), a storage capacitor wiring signal is supplied to the storage capacitor wiring to raise or lower the pixel electrode potential (pixel potential) by capacitive coupling. Thus, the pixel potential of the pixel electrode (5a) can be changed. Therefore, since one pixel can be composed of a bright subpixel and a dark subpixel, a pixel division type liquid crystal display device can be realized.

Further, in each of the liquid crystal panels of the present invention shown in structural examples 1 to 7, a storage capacitor wiring shared by both pixels is provided between pixels adjacent in the column direction, but this embodiment is not limited thereto. Instead, in each of the liquid crystal panels of the present invention shown in Structural Examples 1 to 7, a storage capacitor wiring that is substantially shared by both pixels may be provided between pixels adjacent in the column direction. In other words, in the present invention, it is sufficient if there is a storage capacitor wiring that is substantially shared and has a feature such that the same signal is given to both pixels corresponding to pixels adjacent in the column direction. It may consist of books.

(Configuration example 9 of liquid crystal panel)
FIG. 46 is an equivalent circuit diagram showing a part of the liquid crystal panel 113e in the configuration example 9 of the liquid crystal panel of the present invention. As shown in FIG. 46, in the present liquid crystal panel 113e, the

data signal lines

4x and 4X extending in the column direction (vertical direction in the figure), and the

scanning signal lines

2c, 2d, and 2a extending in the row direction (horizontal direction in the figure). 2b, pixels 100 to 107 arranged in the row and column directions,

storage capacitor lines

3c, 3d, 3a, and 3b, and a common electrode (counter electrode) com, and the structure of each pixel is the same.

In the present liquid crystal panel 113e, one data signal line, one scanning signal line, one storage capacitor line, and one pixel electrode are provided corresponding to one pixel. Since the structure of each pixel is the same, the following description will be given mainly using the pixel 102 as an example.

In the pixel 102, the pixel electrode 5a is connected to the data signal line 4x via the transistor 15a connected to the scanning signal line 2a, a storage capacitor Cha is formed between the pixel electrode 5a and the storage capacitor line 3a, and the pixel electrode 5a. A liquid crystal capacitor Cla is formed between the common electrodes com.

FIG. 47 shows a specific configuration of the liquid crystal panel 113e in the present configuration example 9. FIG. 47 is a plan view showing Configuration Example 9 of the liquid crystal panel 113e. In the liquid crystal panel 113e of FIG. 47, the transistor 15a is disposed near the intersection of the data signal line 4x and the scanning signal line 2a, and the pixel electrode 5a is disposed in the pixel region defined by the

data signal lines

4x and 4X. The storage capacitor line 3a extends in the row direction across the pixel electrode 5a.

In the pixel 102, the semiconductor layer 22a, the source electrode 16a of the transistor 15a, and the drain electrode 17a are formed on the scanning signal line 2a. The drain electrode 17a is connected to the drain lead wire 18a, the drain lead wire 18a is connected to the capacitor electrode 19a, and the capacitor electrode 19a is connected to the pixel electrode 5a through the contact hole 20a.

Here, the capacitor electrode 19a overlaps the storage capacitor wiring 3a via the gate insulating film, and the pixel electrode 5a overlaps the storage capacitor wiring 3a via the gate insulating film and the interlayer insulating film. A storage capacitor Cha (see FIG. 46) is formed.

According to the present configuration example 9, since the pixel electrode 5a forms the storage capacitor line 3a and the storage capacitor Cha, for example, after writing the data signal to the pixel electrode 5a, the storage capacitor line signal is changed, The pixel electrode potential (pixel potential) can be pushed up or pushed down by capacitive coupling. Therefore, since the drive voltage of the source driver 11 (see FIG. 8) can be lowered, the power consumption of the liquid crystal display device 110 can be reduced.

It should be noted that the “polarity of the potential” in the present application means a potential not less than a reference potential (plus) or not more than a reference potential (minus). Here, the reference potential may be Vcom (common potential) which is the potential of the common electrode (counter electrode) or any other potential. Further, in each of the liquid crystal panels of the present invention shown in the configuration examples 1 to 9, the polarity arrangement of a large number of data signal lines may be any arrangement, and all adjacent data signal lines may have opposite polarities. The polarity of the data signal lines may be reversed every two lines, and the effect of the present invention is not affected by the polarity arrangement of the data signal lines. There is an effect.

(Example configuration of a television receiver)
Finally, a configuration example of the television receiver of the present invention will be described. Hereinafter, a configuration example when the liquid crystal display device of the present invention is applied to a television receiver will be described. Here, the liquid

crystal display devices

110 and 110b are represented as a liquid crystal display device 800. FIG. 48 is a block diagram showing a configuration of a liquid crystal display device 800 for a television receiver. The liquid crystal display device 800 includes a liquid crystal display unit 84, a Y / C separation circuit 80, a video chroma circuit 81, an A / D converter 82, a liquid crystal controller 83, a backlight drive circuit 85, a backlight 86, A microcomputer 87 and a gradation circuit 88 are provided. The liquid crystal display unit 84 includes a liquid crystal panel and a source driver and a gate driver for driving the liquid crystal panel.

In the liquid crystal display device 800 configured as described above, first, a composite color video signal Scv as a television signal is input from the outside to the Y / C separation circuit 80, where it is separated into a luminance signal and a color signal. These luminance signals and color signals are converted into analog RGB signals corresponding to the three primary colors of light by the video chroma circuit 81, and further, the analog RGB signals are converted into digital RGB signals by the A / D converter 82. . This digital RGB signal is input to the liquid crystal controller 83. The Y / C separation circuit 80 also extracts horizontal and vertical synchronization signals from the composite color video signal Scv input from the outside, and these synchronization signals are also input to the liquid crystal controller 83 via the microcomputer 87.

The liquid crystal display unit 84 receives a digital RGB signal from the liquid crystal controller 83 at a predetermined timing together with a timing signal based on the synchronization signal. The gradation circuit 88 generates gradation potentials for the three primary colors R, G, and B for color display, and these gradation potentials are also supplied to the liquid crystal display unit 84. In the liquid crystal display unit 84, a driving signal (data signal = signal potential, scanning signal, etc.) is generated by an internal source driver, gate driver, or the like based on the RGB signal, timing signal, and gradation potential, and these driving signals are used. Based on the signal, a color image is displayed on the internal liquid crystal panel. In order to display an image by the liquid crystal display unit 84, it is necessary to irradiate light from behind the liquid crystal panel in the liquid crystal display unit. In the liquid crystal display device 800, the backlight drive is performed under the control of the microcomputer 87. The circuit 85 drives the backlight 86, so that light is irradiated to the back surface of the liquid crystal panel. The microcomputer 87 controls the entire system including the above processing. The video signal (composite color video signal) input from the outside includes not only a video signal based on television broadcasting but also a video signal captured by a camera, a video signal supplied via an Internet line, and the like. The liquid crystal display device 800 can display images based on various video signals.

When an image based on television broadcasting is displayed on the liquid crystal display device 800, as shown in FIG. 49, a tuner unit 90 is connected to the liquid crystal display device 800, whereby the present television receiver 601 is configured. The tuner unit 90 extracts a signal of a channel to be received from a received wave (high frequency signal) received by an antenna (not shown), converts it to an intermediate frequency signal, and detects the intermediate frequency signal, thereby detecting the television signal. A composite color video signal Scv as a signal is taken out. The composite color video signal Scv is input to the liquid crystal display device 800 as described above, and an image based on the composite color video signal Scv is displayed by the liquid crystal display device 800.

FIG. 50 is an exploded perspective view showing an example of the configuration of the present television receiver. As shown in the figure, the present television receiver 601 includes a first casing 801 and a second casing 806 in addition to the liquid crystal display device 800 as its constituent elements. It is configured to be sandwiched between one housing 801 and a second housing 806. The first housing 801 is formed with an opening 801a through which an image displayed on the liquid crystal display device 800 is transmitted. The second housing 806 covers the back side of the liquid crystal display device 800, is provided with an operation circuit 805 for operating the liquid crystal display device 800, and a support member 808 is attached below. Yes.

The present invention is not limited to the above-described embodiments, and those obtained by appropriately modifying the above-described embodiments based on common general technical knowledge and combinations thereof are also included in the embodiments of the present invention.

The active matrix substrate and the liquid crystal panel including the active matrix substrate of the present invention are suitable for a liquid crystal television, for example.

5, 5a to 5f, 5A to 5F Pixel electrode 6 Display area 7

Peripheral area

9, 9a, 45 Gate driver (scanning signal line drive circuit)
11, 43 Source driver (data signal line drive circuit)
13, 46, 49, 51, 53, 55, 57 CS driver (retention capacitor wiring drive circuit)
44, 48, 50, 52, 54, 56 Gate / CS driver (scanning signal line driving circuit / holding capacity wiring driving circuit)
41 Display unit 42 Display control circuit CSD holding circuit (holding capacity wiring drive internal circuit)
15a to 15f, 15A to

12F Transistor

4, 4x, 4X, 4y, 4Y Source line (data signal line)
4x, 4X source line (first data signal line)
4y, 4Y source line (second data signal line)
2, 2ab, 2cd, 2ef, 2a, 2c gate lines (scanning signal lines)
3, 3w, 3x, 3y, 3z, 3a, 3b, 3c, 3d CS line (retention capacitor wiring)
111 Active matrix substrate 112 Counter substrate (color filter substrate)
113a, 113b, 113c, 113d Liquid crystal panel 100 to 105 Pixel 110 Liquid crystal display device 601 Television receiver VDD signal VSS signal COM Common electrode potential (holding capacity wiring signal, second holding capacity wiring signal)
s, s1 terminals (first input section)
sel1 terminal (second input section)
sel2 terminal (3rd input part)
sel3 terminal (4th input part)
sel4 terminal (5th input part)
SEL, SEL1, SEL2 signals (holding target signals)
SEL3, SEL4 signal (second holding target signal)
CS CS signal (holding capacitor wiring signal, first holding capacitor wiring signal)

Claims

An active matrix substrate comprising a data signal line, a scanning signal line, a transistor connected to the data signal line and the scanning signal line, a pixel electrode included in a pixel, and a storage capacitor line forming a storage capacitor ,
An active matrix substrate, wherein a storage capacitor wiring signal for driving the storage capacitor wiring is supplied to each storage capacitor wiring from both ends thereof.
2. The active matrix substrate according to claim 1, wherein the plurality of storage capacitor wiring drive circuits for outputting the storage capacitor wiring signal are monolithically formed on a glass substrate.
2. The active matrix substrate according to claim 1, wherein the plurality of storage capacitor line drive circuits for outputting the storage capacitor line signals and the scanning signal line drive circuit are formed monolithically.
The storage capacitor wiring driving circuit that drives the storage capacitor wiring supplies the storage capacitor wiring signal to the storage capacitor wiring that forms the pixel electrode and the storage capacitor, thereby causing the pixel potential written from the data signal line to the pixel electrode. The active matrix substrate according to claim 1, wherein the direction is changed in a direction corresponding to the polarity of the pixel potential.
A plurality of pixel electrodes are provided in one pixel region,
2. The active matrix substrate according to claim 1, wherein the storage capacitors formed between the pixel electrodes and the storage capacitor lines corresponding to the pixel electrodes are different from each other in one pixel region. .
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
2. The active matrix substrate according to claim 1, wherein one storage capacitor line driving internal circuit supplies the storage capacitor line signal to at least one storage capacitor line.
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
The retention capacitor line drive internal circuit is provided every other retention capacitor line,
In two adjacent storage capacitor lines, one storage capacitor line is supplied with the storage capacitor line signal output from the storage capacitor line driving internal circuit, and the other storage capacitor line is output from an external signal source. The active matrix substrate according to claim 1, wherein the processed signal is supplied.
In one pixel region, the first and second pixel electrodes, and first and second transistors connected to the scanning signal line,
The first pixel electrode is connected to the data signal line through the first transistor and forms the storage capacitor line and the first storage capacitor, and the second pixel electrode is connected through the second transistor. 2. The active matrix substrate according to claim 1, wherein the active matrix substrate is connected to the data signal line and forms the storage capacitor line and the second storage capacitor.
The extending direction of each data signal line is the column direction,
The first and second pixel regions are arranged in this order in the column direction, and in each pixel region, the first and second pixel electrodes are arranged in this order in the column direction,
The second pixel electrode in the first pixel region and the first pixel electrode in the second pixel region are adjacent to each other, and each pixel electrode forms the same storage capacitor line and storage capacitor. The active matrix substrate according to claim 1, wherein:
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
Retention target signal is input to each retention capacitor wiring drive internal circuit,
When the scanning signal supplied to the scanning signal line corresponding to the subsequent pixel after the own stage becomes active, the holding capacitor wiring driving internal circuit corresponding to the own pixel captures the above holding target signal and holds it. And
2. The active matrix according to claim 1, wherein an output of the storage capacitor line driving internal circuit corresponding to the pixel of the own stage is supplied as a storage capacitor line signal to the storage capacitor line corresponding to the pixel of the second stage. substrate.
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
Retention target signal is input to each retention capacitor wiring drive internal circuit,
When the scanning signal supplied to the scanning signal line corresponding to the subsequent pixel after the own stage becomes active, the holding capacitor wiring driving internal circuit corresponding to the own pixel captures the above holding target signal and holds it. And
The output of the storage capacitor wiring driving internal circuit corresponding to the pixel of the own stage is transferred to the storage capacitor wiring corresponding to the pixel of the own stage and the storage capacitor wiring corresponding to the pixel of the previous stage before the own stage. The active matrix substrate according to claim 1, wherein the active matrix substrate is supplied as:
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
Retention target signal is input to each retention capacitor wiring drive internal circuit,
The storage capacitor wiring drive internal circuit corresponding to its own stage is
A first input unit for inputting a scanning signal to be supplied to a scanning signal line corresponding to a subsequent pixel after the own stage; second and third input units for inputting the holding target signal; and the holding capacitor wiring An output unit for outputting a signal,
When the potential of the retention target signal input to the second input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a high level potential Output signal,
When the potential of the retention target signal input to the third input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a low level potential Output signal,
2. The potential of the hold target signal input to the second and / or third input unit is held during a period when the scanning signal input to the first input unit is inactive. An active matrix substrate as described in 1.
The storage capacitor line driving circuit for driving the storage capacitor line includes a plurality of storage capacitor line driving internal circuits for supplying the storage capacitor line signal to the storage capacitor line,
Retention target signal is input to each retention capacitor wiring drive internal circuit,
The storage capacitor wiring drive internal circuit corresponding to its own stage is
A first input unit for inputting a scanning signal to be supplied to a scanning signal line corresponding to a subsequent pixel after the own stage; second and third input units for inputting the holding target signal; and the holding capacitor wiring An output unit for outputting a signal,
When the potential of the retention target signal input to the second input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a high level potential Output signal,
When the potential of the retention target signal input to the third input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a low level potential Output signal,
When the scanning signal input to the first input unit becomes inactive and a scanning signal supplied to a scanning signal line corresponding to a pixel after the subsequent pixel becomes active, 2. The active matrix substrate according to claim 1, wherein the potential of the holding target signal input and held in the second input unit and / or the third input unit is lowered.
A fourth and a fifth input unit for inputting the second holding target signal;
When the potential of the retention target signal input to the second input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a high level potential Output signal,
When the potential of the retention target signal input to the third input unit when the scanning signal input to the first input unit becomes active, the storage capacitor line having a low level potential Output signal,
When the scanning signal input to the first input unit becomes inactive and the scanning signal supplied to the scanning signal line corresponding to the pixel after the subsequent pixel becomes active, the first signal is input. The potential of the holding target signal input to and held in the second input unit and / or the third input unit is lowered by the second holding target signal input to the 4 input unit and / or the fifth input unit. The active matrix substrate according to claim 13.
The pixel regions including a plurality of pixel electrodes are arranged in the row and column directions with the extending direction of each data signal line as the column direction, and first and second data signal lines are provided corresponding to one pixel region column. One scanning signal line is provided corresponding to one pixel region row,
A data signal line connected via a transistor to each pixel electrode included in one of two pixel areas adjacent in the column direction, and a pixel signal connected via a transistor to each pixel electrode included in the other of the two pixel areas. 2. The active matrix substrate according to claim 1, wherein the data signal line is different.
The active matrix substrate according to claim 15, wherein two adjacent scanning signal lines are simultaneously selected.
16. The active matrix substrate according to claim 15, wherein data signals having opposite polarities are supplied to the first data signal line and the second data signal line.
Two pixel electrodes are provided in one pixel region,
The active matrix substrate according to claim 1, wherein one pixel electrode surrounds the other pixel electrode.
One pixel area is composed of two sub-pixels,
19. The sub-pixel including the one pixel electrode is a dark sub-pixel having a relatively low luminance, and the sub-pixel including the other pixel electrode is a bright sub-pixel having a relatively high luminance. An active matrix substrate as described in 1.
One pixel electrode is provided in one pixel region,
2. The active matrix substrate according to claim 1, wherein a storage capacitor is formed between the pixel electrode and a storage capacitor line corresponding to the pixel electrode in one pixel region.
The storage capacitor line includes a first storage capacitor line group driven by a first storage capacitor line signal output from a storage capacitor line driving circuit that drives the storage capacitor line, and a second storage capacitor line that is output from an external signal source. 2. The active matrix substrate according to claim 1, comprising a second storage capacitor wiring group driven by a storage capacitor wiring signal.
The (k-2) -th storage capacitor line and the k-th storage capacitor line are supplied with a storage capacitor line signal output from the k-th storage capacitor line driving internal circuit,
A signal output from an external signal source is supplied to the storage capacitor line in the (k-3) th row and the storage capacitor line in the (k-1) th row,
12. The active matrix substrate according to claim 11, wherein a scanning signal supplied to a scanning signal line in the (k + 3) th row is input to the kth storage capacitor line driving internal circuit.
The active matrix substrate according to claim 7, wherein the signal output from the external signal source is a common electrode potential.
The active matrix substrate according to claim 21, wherein the second storage capacitor wiring signal is a common electrode potential.
An active matrix substrate according to any one of claims 1 to 24,
By simultaneously supplying a storage capacitor wiring signal for driving the storage capacitor wiring from both ends thereof to each storage capacitor wiring, the pixel potential written from the data signal line to the pixel electrode is changed to the pixel potential. A liquid crystal display device, characterized in that display is performed by changing the orientation in accordance with the polarity.
A liquid crystal panel comprising the active matrix substrate according to any one of claims 1 to 24.
A television receiver comprising: the liquid crystal display device according to claim 25; and a tuner unit that receives a television broadcast.