JP2002108295A - Active matrix board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the failure that display condition of a block is different with respect to the peripheral areas of the block even though the boundary of the block is supplied with the same potential with that for the peripheral areas when an image is displayed by an active matrix board that conducts a block driving. SOLUTION: In a second block which is supplied with continuity signals later within a horizontal interval, a signal line c on a boundary line between the second block and an adjacent first block is supplied with preliminary polarity reversal signals which reverse polarity of the voltage of a signal line in an own block as preliminary within one horizontal interval, from a reversal signal line 3 by an auxiliary signal line switching element SWc2 that is different from a signal switch element SWc and is controlled by an auxiliary control line 2 which differs from a control line SW2. Thus, the signal line c is beforehand polarity reversed prior to a normal polarity reversal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an active matrix substrate used for a liquid crystal display device and the like.

[0002]

2. Description of the Related Art Conventionally, an active matrix substrate used for a liquid crystal display device or the like has a signal line for supplying a display signal to a pixel and a scanning line for driving a switching element provided for each pixel. An external drive circuit is mounted so as to have the same number of output terminals as the number of signal lines and scanning lines for driving. However, in order to reduce the number of external circuits and the cost of mounting, a method of reducing the number of ICs to half or one third and branching the ICs to select and supply signals by signal line switching elements. Can be considered. Specifically, a signal line switching element is provided at each end of the signal line, and the other ends of these elements are electrically connected to a signal input section for mounting an external circuit. A signal line branching section is provided therebetween. A control line for switching conduction / non-conduction of the element is commonly connected to a control end of the signal line switching element for each of a plurality of blocks, so that signals can be supplied to the signal line in a time-division manner. Such a structure is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-234237, and describes, in addition to the above effects, effects such as easy mounting of a drive circuit on a single side. By the way, in this reference, the scanning line is selected for each block, while the signal line switches adjacent lines by switching elements. However, the effect is the same even if the signal line is set for each block. The circuit configuration can be simplified.

[0003]

In the above structure, when switching between blocks due to the parasitic capacitance of the signal line and the pixel electrode,
There has been a problem that the signal line and the pixel at the boundary of the block are rocked and the boundary is visually recognized. This principle will be described with reference to FIGS.

Here, an example in which a signal having the maximum amplitude is supplied from the output terminals s _{1 to} s ₄ of the signal line driving circuit 1 in order to display the entire screen in black will be described. A scan line g ₁
Is selected while the signal line switching element (SW
a) are connected to control lines SW ₁ and SW ₂
Are sent in sequence. First SW ₁ of the signal line switching element SWa by selection, SWb are turned on. As a result, the signal from the signal line driving circuit 1 is supplied to the signal lines a and b. Since the scanning line g ₁ is selected, it is written to the pixel A _1, B _1. At this time SW ₂ signal line because it is not selected For c, the signal is not supplied to the d. Then SWa SW ₁ becomes unselected, since SWb becomes nonconductive, the signal lines a, b and the pixel A _1, B ₁ is in a state of holding. The SW ₂ is selected signal line switching element SWc, the SWd is turned, the supply signal from the signal line drive circuit 1 is a signal line c, to d, for the scanning line g ₁ is selected, it is The data is written to the pixels C ₁ and D ₁ , respectively.

[0005] Since taking as an example the case where the entire current screen and black display, but the signal line a~d is supplied with the same signal, typically a signal line driver during the selection selected and SW ₂ SW ₁ The signal from circuit 1 is switched.

Incidentally, a parasitic capacitance Csd exists between the pixel electrode and the signal line. FIG. 7 shows C of only pixel B2.
Although sd is described, since Csd is added to each signal line by the number of pixels along the signal line, actually, the capacitance that cannot be ignored compared to the capacitance of the entire signal line is added. Will exist. Here, when the SW ₁ is SW ₂ is selected in the non-selected state, the potential of the signal line c as shown in FIG. 8 is polarity reversed. The signal line b is a pixel electrode (B
2 is linked signal line c and the capacitor through a plurality of pixels) of the signal line direction including the, moreover SW ₁ because a non-selection signal line b by the polarity inversion of the signal line c push-up is the no small potential Can be Since moreover the scanning lines g ₁ this time is the state of being selected, the push-up was potential is supplied to the pixel B _1, while the scanning line g ₁ in this state is switched to the unselected.

Since such an operation is performed in all the scanning lines, only one line corresponding to the signal line b in the display of the entire screen is supplied with a higher voltage than the other pixels. There is a problem that the line is visually recognized as a black line.

By the way, the same thrust occurs at the moment when SW ₂ is not selected and SW ₁ is selected, but the scanning line g ₁
In currently selected for SW ₂ at the next timing is rewritten to the correct potential is selected, there is no display on the problems with the pixel C _1. In addition, when the scanning line g ₁ is not conducting,
The swing due to sd differs depending on the signal line that is capacitively coupled to the pixel, but there is no difference as the effective value of the entire display period.
No problem.

Here, for simplicity, the driving in two blocks has been described. However, for example, when the entire screen is driven in four blocks, three black lines are added at the boundary of each block. Is visually recognized.

[0010]

In order to solve the above-mentioned problems, an active matrix substrate according to the present invention comprises a pixel switching element connected to each of a plurality of pixel electrodes;
A plurality of scanning lines for driving the pixel switching element;
A plurality of signal lines for applying a data signal to the pixel electrode via the pixel switching element, and a signal input unit for supplying the data signal to the signal line and inverting the polarity of the voltage of the signal line; The signal line is divided into blocks according to the timing at which the data signal is supplied within a period, and a signal line branching unit that branches a data signal from the signal input unit to each of the blocks can be switched between conducting and non-conducting. A signal line switching element for turning on / off the supply of a data signal from the signal line branching unit to each of the signal lines, and a conduction signal provided to each of the blocks to supply a conduction signal to the signal line switching element. A control line for switching the conduction / non-conduction of the switching element for each of the blocks according to the supply timing of the data signal; In the matrix substrate, for at least one of at least two adjacent blocks, the control wiring of the adjacent block is supplied with the data signal earlier than the control wiring of the own block within one horizontal period. The signal line in the own block on the boundary line is controlled by receiving the supply of the auxiliary conduction signal by another auxiliary control wiring different from the control wiring of the own block, and controlled by the control wiring of the own block. By a different auxiliary signal line switching element different from the signal line switching element, a pre-run polarity in which the polarity of the signal line voltage of the own block is inverted before the end of the data signal supply to the adjacent block within one horizontal period. It is characterized by receiving an inversion signal.

With the above configuration, the signal line in the own block on the boundary line with the adjacent block inverts the polarity of the voltage of the signal line of the own block as a pre-run by the auxiliary signal line switching element.

Therefore, since the polarity of the signal line can be inverted in advance, the phenomenon that the pixel on the boundary line is written with the fluctuation of the potential as described above and is held over the display period is generated. Will not happen. Therefore, it is possible to reduce the problem that the display state is different from that of the periphery even though the same potential is supplied to the periphery at the boundary of the block.

Further, a conduction signal is supplied to each block in accordance with a predetermined selection order, and another signal line switching element is provided only for a signal line which causes a display problem at this time. Therefore, the area where the signal line switching element is formed can be made large because the unnecessary signal line switching element is not provided. In addition, one control wiring for another signal line switching element may be provided between each block. Therefore, the control signal does not need to be generated excessively, and the wiring is easily formed.

In the active matrix substrate according to the present invention, in addition to the above structure, at least two adjacent signal lines on the boundary between the blocks are connected via the auxiliary signal line switching elements. The same pre-feed polarity inversion signal is supplied to each other, and within one horizontal period, the pre-feed signal is supplied to the signal line of the earlier block of the adjacent block among the adjacent blocks. The supply of the polarity inversion signal is terminated.

According to the above configuration, for example, the same preceding polarity inversion signal is supplied to both signal lines on the boundary line by the auxiliary inversion data supply line connected to both signal lines on the boundary line. Within the horizontal period, the supply of the preceding polarity reversal signal ends before the start of data signal supply to the signal line of the earlier block of the adjacent blocks among the adjacent blocks. Therefore, when this display device has a function of inverting the image horizontally, that is, when the scanning of the image data is performed from both the left and right, and the order of selecting the control wiring may be changed, either block is used first. Even if the signal is supplied, the polarity inversion period due to the supply of the data signal does not overlap with the polarity inversion period of the pre-run. Therefore, in addition to the effect of the above configuration, when the display device has a left-right reversal function of an image by providing the auxiliary signal line switching element on both signal lines at the boundary, that is, Even when scanning is performed from both the left and right and the order of selecting control wiring may be changed, as described above,
Even if the same potential as the surroundings is supplied at the boundary of the block, the problem that the display state is different from the surroundings can be reduced.

Further, according to such a connection method, the auxiliary control wiring and the line for supplying the pre-inversion polarity inversion signal (auxiliary inversion data supply line) can be made common, so that the wiring formation area is not wasted.

Further, in the active matrix substrate according to the present invention, in addition to the above configuration, the auxiliary control wiring is a control wiring of another block to which a conduction signal is supplied earlier than a control wiring of the own block in the horizontal period. It is characterized by having.

According to the above configuration, the auxiliary control wiring includes:
This is a control wiring of another block to which a conduction signal is supplied before the control wiring of the own block in the horizontal period. Therefore, the control wiring can also serve as the auxiliary control wiring. Therefore, in addition to the effects of the above configuration, there is no need to generate a special control signal externally and supply it to another signal line switching element, which complicates an external circuit involved in control signal generation and reduces control wiring. Also, there is no problem in the layout.

In the active matrix substrate according to the present invention, in addition to the above configuration, the auxiliary control wiring is supplied with a conduction signal prior to the control wiring of the own block in the horizontal period. It is characterized by being.

According to the above configuration, the auxiliary control wiring includes:
This is a control wiring of an adjacent block to which a conduction signal is supplied before a control wiring of the own block in the horizontal period. Therefore, the auxiliary control wiring and the control wiring of the adjacent block can be shared. Therefore, in addition to the effect of the above configuration, since the control wiring of another signal line switching element only needs to extend the control wiring of the adjacent block by a small distance, the pattern arrangement is extremely easy.

Further, in the active matrix substrate according to the present invention, in addition to the above configuration, the terminal of the auxiliary signal line switching element which is not connected to the signal line is controlled by the control wiring of the own block. It is characterized in that the signal line switching element is electrically connected to the same signal input portion to which the other terminal not connected to the signal line is connected.

According to the above arrangement, the terminal of the auxiliary signal line switching element which is not connected to the signal line is connected to the signal line of the signal line switching element controlled by the control wiring of the own block. The other terminal is electrically connected to the same signal input section to which it is connected. In other words, the supply source (auxiliary inversion data supply line) that supplies the pre-polarity inversion signal to the auxiliary signal line switching element is the signal input connected to the signal line switching element controlled by the control wiring of the own block. Department. Therefore, the data signal input to the own block from the signal input unit can also serve as the reversal polarity inversion signal of the own block. therefore,
In addition to the effect of the above configuration, the structure is simple because there is no need to provide a signal input section to the other end of the another signal line switching element.

Further, since the input and output of the signal line switching element are connected in parallel and only the control wiring is separately connected, it is easy to provide space.

Further, since the signal input section is in a state where a signal of another block is supplied, the polarity has already been inverted, and it is necessary to generate and supply a polarity inversion signal as in the case where it is provided separately. In addition, an increase in the number of components required for signal input can be prevented.

Further, in the active matrix substrate according to the present invention, in addition to the above configuration, the terminal of the auxiliary signal line switching element that is not connected to the signal line is connected to an adjacent signal line across blocks. The signal line switching device is characterized in that it is electrically connected to the same signal input portion to which the other terminal not connected to the signal line is connected.

With the above arrangement, the terminal of the auxiliary signal line switching element which is not connected to the signal line is connected to the signal line of the signal line switching element connected to the adjacent signal line across the block. The other terminal is electrically connected to the same signal input unit to which it is connected. In other words, a supply source (auxiliary inversion data supply line) that supplies a pre-inversion polarity inversion signal to the auxiliary signal line switching element is connected to the signal line switching element connected to an adjacent signal line across blocks. This is the signal input section. Therefore, the data signal input from the signal input unit to the adjacent block can also serve as the reversal polarity inversion signal of the own block. Therefore, in addition to the effect of the above configuration, since the signal level supplied in advance is a normal display signal of the adjacent line, it is often the same or similar to the normal display signal of the signal line. Such a problem is less likely to occur. If it occurs, the signal is different between adjacent lines, that is, it corresponds to a boundary where the display state is switched, and therefore, it is difficult to visually recognize the problem, and there is no problem.

Further, in the active matrix substrate according to the present invention, in addition to the above configuration, the terminal of the auxiliary signal line switching element that is not connected to the signal line is connected to the pixel electrode connected to the signal line. A signal line switching element that supplies a data signal to a pixel to be displayed in the same color and is connected to another signal line located in the adjacent block and located closest to the signal line, which is not connected to the signal line Are electrically connected to the same signal input section to which the terminal is connected.

According to the above configuration, the terminal of the auxiliary signal line switching element that is not connected to the signal line supplies a data signal to a pixel that should display the same color as the pixel electrode connected to the signal line. And the same signal to which the other terminal of the signal line switching element connected to another signal line located closest to the signal line in the adjacent block and not connected to the signal line is connected. It is electrically connected to the input unit. In other words, a supply source (auxiliary inversion data supply line) that supplies a pre-polarity inversion signal to the auxiliary signal line switching element supplies a data signal to a pixel that should display the same color as the pixel electrode connected to the signal line. And the signal input unit connected to the signal line switching element connected to another signal line located in the adjacent block and closest to the signal line. Therefore, the data signal of the same color input to the adjacent block from the signal input unit can also serve as the reversal polarity inversion signal of the own block. Therefore, in addition to the effect of the above configuration, the signal level supplied in advance is the same or similar to the normal display signal of the signal line because the signal level is the normal display signal of the same color of the adjacent line. ,
Problems such as blackening are less likely to occur. If it occurs, the signal is different between adjacent lines, that is, it corresponds to a boundary where the display state is switched, and therefore, it is difficult to visually recognize the problem, and there is no problem.

Further, in the active matrix substrate according to the present invention, in addition to the above configuration, the signal line switching element has a lower resistance when conducting than the auxiliary signal line switching element.

According to the above configuration, the signal line switching element has a lower resistance when conducting than the auxiliary signal line switching element. The auxiliary signal line switching element for inverting the polarity in advance does not need to have a driving ability enough to sufficiently charge, but only needs to invert the polarity to some extent. Therefore, the auxiliary signal line switching element for inverting the polarity in advance does not need to be formed to have the same size as the signal line switching element for supplying the normal polarity inversion signal and large enough to sufficiently reduce the resistance. Therefore, in addition to the effect of the above configuration, the auxiliary signal line switching element can be easily spatially arranged.

The signal line is connected with a high resistance to the polarity reversal side of the pre-run, whereas it is connected to the normal write side with a low resistance. Even if noise or the like is mixed in the signal line, the normal side can obtain an output signal from the signal input unit without being affected. For this reason, display stability is improved.

Also, the load seen from the signal input unit side is multiplied by a plurality when connected by the same signal line switching element, and the signal input unit side is liable to swing due to the opposite polarity, so that the signal input unit is The output may not be correct or the signal input unit may malfunction due to latch-up, depending on the drive capability of the drive IC or the like, but with this structure, the apparent appearance of the signal input unit at the same moment The load is smaller than in the above case, and these problems are solved.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] An embodiment of the present invention will be described with reference to FIGS.
It is as follows.

The active matrix substrate according to the present embodiment is a liquid crystal display device as a display device having scanning lines, signal lines, and pixel electrodes and driven for display in an active matrix system. This is effective for preventing the display crystal from lowering. The equivalent circuit will be described with reference to FIG.

Each of the pixel electrodes is provided with a pixel A ₁ , B ₁ ,... As a data processing section, and a pixel switching element such as a TFT (thin film transistor) (not shown) is connected to the pixel electrode. These pixels are composed of liquid crystal, and they constitute a liquid crystal panel. A liquid crystal display device that displays an image on the liquid crystal panel is constructed. Actually, many signal lines and members corresponding thereto are provided in addition to those shown in the figure, but here, for convenience of explanation, the signal lines are simplified to f ′ , F, a, b, c, d, e, and e ′, and similarly, only _two scanning lines, g ₁ and g ₂ .

One block (referred to as a first block) is constituted by the signal lines f ', f, a, and b. Another block (referred to as a second block) is constituted by the signal lines c, d, e, and e ′. In the present embodiment, a configuration of two blocks will be described. However, it is not limited to this. That is, in the present embodiment, the configuration is two blocks as in the conventional example, but the same applies to the case of a larger number of blocks.

The signal lines f ', f, a, b, c, d,
Signal line switching elements (SWa, SWb, SWc, SWd, etc.) are provided at the ends of e and e 'as shown in the figure, and the other ends of these elements serve as signal input sections for mounting an external circuit. The signal line driving circuit 1 (driver IC) is electrically connected, and a signal line branching unit 7 is provided between the signal line driving circuit 1 and the signal line switching element.
The signal line switching element can be constituted by a CMOS transistor, and in some cases, an NMOS transistor. Further, the signal line branching unit 7 can be configured by branching wiring.

These signal line switching elements are electrically connected to output lines s ₁ , s ₂ , s ₃ , and s ₄ extending from the output end of the signal line driving circuit 1, respectively. To the control terminal such as the signal line switching element SWa is controlled wire SW ₁ and SW ₂ switches conduction and non-conduction of the signal line switching elements are connected in common to each of a plurality of blocks, by switching to such An image signal (data signal) from the signal line driving circuit 1 is supplied to the signal line in a time division manner as a display signal.

That is, a signal line or a scanning line is divided into blocks, and if a signal line is used, a certain scanning line is selected (one selection period of a scanning line, one horizontal period), and if it is a scanning line, one vertical line is used. The period to which the signal is applied is switched over time so that the data signal and the scanning signal are sequentially applied to each block by dividing the period. Among them,
In this embodiment mode, a signal line is divided into blocks, one selection period of a scanning line is time-divided, and a block to which a signal is applied is switched with time so that a data signal is sequentially applied to each block. I have. When the scanning lines are divided into blocks, one vertical period may be time-divided, and the block to which the signal is applied may be switched over time so that the scanning signal is sequentially applied to each block.

The signal line driving circuit 1 for performing such block driving is provided with n sampling circuits (not shown). If the number of blocks is two as described above, the number of signal lines is 2n because it is the product of them.

In the signal line driving circuit 1, n shift pulses are generated by the shift register and sequentially supplied to the n shift pulses. As n data signals are sequentially input to the signal line driving circuit 1, the data signals are input to and held by the n sampling circuits at each timing of the sampling pulse.

These data signals are output from each sampling circuit to one end of all the signal line switching elements connected to the signal lines via the signal line branching unit 7 at the timing indicated by the predetermined control signal. This is, for example, a data signal for the first block.

At the same time, the data signal sent during this time is input to and held by each of the n sampling circuits at each timing of a new sampling pulse generated by the shift register. These data signals are output from the respective sampling circuits to the one ends of all the signal line switching elements connected to the signal lines via the signal line branching unit 7 at the next predetermined timing. This is, for example, a data signal for the second block.

The data signal output from the signal line driving circuit 1 passes through each signal line switching element (SWa, etc.) only when the pulse of the conduction signal of the control lines SW ₁ and SW ₂ is on (high). Is supplied to the corresponding signal line. Therefore, within one horizontal period, as shown in FIG. 2, _first, only the control wiring SW1 is turned on to supply the data signal only to the first block (the block including the signal line b). supplying a data signal only to the (block including a signal line c) the second block is turned on only the control line SW _2. In this manner, block driving of the signal line is performed.

The conduction signal (pulse) supplied to the control lines SW ₁ and SW ₂ and supplied from each control line to each signal line switching element is supplied as follows, for example. That is, the clock CLK is generated by a PLL (phase-locked loop) oscillator. This clock CLK
The horizontal synchronization signal HSY synchronized with the image signal is counted by a horizontal counter, and each decoder creates each pulse based on the value of the counter. Each decoder is set to a predetermined value in advance, and outputs each pulse according to the value. Predetermined value, such as s _1, etc. g _2, and each pixel,
Individual parameters such as SWa are determined and optimized.

FIG. 2 shows how the signal lines are driven in this embodiment. In the figure, SW _P is a drive waveform of the auxiliary control wiring 2. In the present embodiment, the data signal applied to the signal line is frame-inverted and line-inverted, which is the same in any of the embodiments described later. The difference from the conventional example shown in FIG. 7 is that the signal lines b and c corresponding to the boundaries of the blocks are controlled by the auxiliary control wiring 2 which is another control wiring in parallel with the normal signal line switching elements SWb and SWc. The auxiliary signal line switching elements SWb2 and SWc2 are connected. Prior to the timing of supplying a regular data signal (display signal) to the signal line, the auxiliary control wiring 2 is selected. At this time, a signal having a polarity opposite to that of the signal of the previous frame is supplied to the inverted signal line 3 (auxiliary inverted data supply line). As a result, the polarity of the signal line can be inverted in advance as the polarity inversion of the pre-run. This solves the above-described problem in that the last signal line of the previous block swings and the boundary is visually recognized due to the polarity inversion when the subsequent block is selected.

The auxiliary control wiring 2 is also connected to the control wiring SW ₁
And it can be driven in the same circuit configuration as that of SW _2. Further, the signal supplied from the inversion signal line 3 is an original signal of the polarity inversion for determining the polarity of the output, which is the source of the signal applied to the signal line in the signal line driving circuit 1 (V
ref) or a signal having a waveform whose voltage value is appropriately increased or decreased.

More specifically, the polarity reversal timing of the pre-run is described as follows. The start timing and the end timing of the normal polarity reversal period for supplying the data signal on the signal line b are Sb and Sb, respectively.
Eb. Similarly, the start time and the end time of the normal polarity inversion period for supplying the data signal on the signal line c are Sc and Ec, respectively. The start time and the end time of the polarity inversion period of the pre-line preceding the normal polarity inversion period for supplying the data signal on the signal line b are Sbp and Ebp, respectively. Similarly, on the signal line c, the start timing and the end timing of the polarity reversal period of the pre-line preceding the normal polarity reversal period for supplying the data signal are Scp and Ecp, respectively. This definition is the same in other embodiments.

At this time, in the present embodiment, since the auxiliary control line 2 is common to the signal line b and the signal line c,
= Ecp. Further, since the inversion signal line 3 is also common, the signal line b has a structure in which a reversal polarity reversal signal for reversing the polarity of the preamble of the signal line c is also input from the inversion signal line 3 to the signal line b. ing. For this reason, in order to properly perform the normal polarity inversion of the signal line b, it is necessary that the timings do not overlap, so that Ebp ≦ Sb. That is, Ecp = Ebp ≦ Sb.

More specifically, since a potential different from that written from the inversion signal line 3 is applied to the signal line at a regular timing, the swing corresponding to this potential difference is applied to the endmost signal line of the previous block. However, this potential difference is sufficiently small as compared with the inversion of the polarity of the display signal, and is often invisible to the naked eye. If this poses a problem, it is preferable to supply an inversion signal corresponding to the halftone to the inversion signal line 3 so as to minimize the swing in the halftone where visibility becomes highest.

Further, since the auxiliary signal line switching element for the pre-run is provided on both signal lines (b and c) at the boundary, this display device has a function of inverting the image horizontally, that is, the image data. Is performed from both the left and right sides, and the selection order of SW1 and SW2 may be interchanged, the above effect can be realized. According to the connection method as shown in FIG.
Since the control wiring and the inversion signal line of SWc2 are commonly used as shown in 2 and 3 in FIG.

By the way, if only the above-mentioned effect is to be obtained, it is conceivable to supply an inverted signal by previously driving the normal control wiring and the signal line as a whole instead of providing another signal line switching element. .

On the other hand, in the structure according to the present embodiment, since the pre-inversion is performed by using a signal different from the normal polarity inversion signal, it is possible to suppress an increase in power consumption required for the polarity inversion of all lines. Also, a driver IC as the signal line driving circuit 1 does not need to have a very large driving capability. The structure of the present embodiment is advantageous in this respect. Further, as described above, since the original signal (Vref) of the polarity inversion for determining the polarity of the output from the signal line driving circuit 1 can be given to the inverted signal line 3, it is necessary to create the inverted signal. Nor. When a predetermined inverted signal that is not a completely inverted black signal is required as described above,
A method of supplying a signal to the counter electrode or fixing it to the ground potential is also effective.

When there are three or more blocks,
Another auxiliary control wiring 2 and inverted signal line 3 at the boundary of each block may be connected inside or outside the panel, and the signal input section to the panel may be provided at one place.

[Second Embodiment] The following will describe another embodiment of the present invention with reference to FIGS. For convenience of explanation, members having the same functions as the members shown in the drawings of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the present embodiment, as shown in FIG. 3 which is an equivalent circuit, when the timings at which the normal display signals are supplied are compared among the signal lines b and c corresponding to the boundaries of the blocks, Only in the signal line c to which the regular display signal is supplied, in parallel with the regular signal line switching element SWc,
The auxiliary signal line switching element SWc2 controlled by the auxiliary control wiring 2 is connected. Prior to the timing of supplying a regular display signal to the signal line, the auxiliary control wiring 2 which is another control wiring is selected. At this time, a signal having a polarity opposite to that of the signal of the previous frame is supplied to the inverted signal line 3.

FIG. 4 shows how the signal lines are driven in this embodiment. In the figure, SW _P is a drive waveform of the auxiliary control wiring 2. In the structure of the present embodiment, different from the first embodiment, it is also possible to select the auxiliary control wiring 2 and supply an inversion signal from the SWc2 during the normal write timing of the first block. This eliminates the need for a certain period of time for supplying the polarity inversion signal, so that the normal signal supply period of each block can be maximized. Even if they are selected at the same time, the inversion signal is supplied from the inversion signal line 3 different from the signal line driving circuit 1 and the signal line b
Since c and c are electrically separated from each other, they do not affect the output of the signal line driving circuit 1 nor the normal writing performed via the signal line b.

That is, in the present embodiment, the auxiliary control wiring 2 and the inverted signal line 3 are not connected to the signal line b.
It is connected only to the signal line c. For this reason, the polarity reversal timing of the pre-run of the signal line c may overlap the normal polarity reversal timing of the signal line b. After the signal line b is oscillated by the polarity inversion of the pre-run of the signal line c, the polarity may be inverted when the normal polarity inversion timing of the signal line b exists completely or partially. Therefore, in this embodiment, Ecp <Eb.

[Embodiment 3] Still another embodiment of the present invention is described below with reference to FIG. For convenience of explanation, members having the same functions as the members shown in the drawings of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the present embodiment, as shown in FIG. 5 which is an equivalent circuit, a signal line c corresponding to a boundary of a block selected later is provided with a regular signal line switching element SW.
parallel is c, the auxiliary signal line switching element SWc2 are connected, the input and output of these two switching elements in common, the auxiliary control wiring SWc2 is connected to the control wire SW ₁ of the first block. Signal line c, prior to the timing for supplying a normal data signal to the signal line, SWc2 the selection period of the first block is turned, the output s ₁ from the time the signal line drive circuit 1 (driver IC) is already Since a signal having a polarity opposite to the polarity of the signal of the previous frame is supplied, blackening is prevented in the same manner as described above.

In this structure, another signal line switching element S
Since the inverted signal line 3, the auxiliary control wiring 2, and its signal input portion are not newly required for Wc2, the design is easy in area and the structure is simple. Also, there is no need to separately create a signal for reversing the polarity of the pre-run.

Here, SWc2 is designed to be smaller than SWc. The auxiliary signal line switching element SWc2 for inverting the polarity in advance does not need to have a driving ability enough to sufficiently charge, and only needs to invert the polarity to some extent. There is no need to design. For this reason, two signal line switching elements are provided per signal line.
Also in the present embodiment, which must be arranged individually, it is easy to spatially arrange. Furthermore, even if noise or the like is mixed in the signal line on the polarity inversion side, it is connected to the polarity inversion side with a high resistance, while the regular writing side is connected with a low resistance. Side can obtain an output signal from the signal line driving circuit 1 without being affected,
The display stability is improved.

Further, the load viewed from the signal line drive circuit 1 side is multiplied by a plurality when connected by the same signal line switching element, and the driver is liable to swing because of the opposite polarity, so that the signal line drive Depending on the drive capability of the circuit 1, the output may not be correct or the latch-up may occur to cause the operation failure of the signal line driving circuit 1, but in this structure, the apparent load of the signal line driving circuit 1 at the same moment is Smaller than in the above case, these problems are solved.

In the present embodiment, similarly to the second embodiment, the driving waveform is as shown in FIG. 4, and Ecp <Eb.

[Fourth Embodiment] The following will describe another embodiment of the present invention with reference to FIG. For convenience of explanation, members having the same functions as the members shown in the drawings of the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the present embodiment, as shown in FIG. 6 which is an equivalent circuit, a signal line c corresponding to a boundary in a block selected later is provided with a regular signal line switching element SWc.
And in parallel, the control lines has a signal line connected switching elements SWc2 is located in a control line SW ₁ of the first block, the signal line driver circuit 1 (driver IC) side corresponding to the input, the adjacent across the block It is connected to the output s ₄ of the signal line drive circuit 1 corresponding to the input signal line b to. Since the level of the signal supplied for inverting the polarity of the signal line c in advance is a normal display signal of the signal line b which is an adjacent line, it may be the same or similar to the normal display signal of the signal line c. In many cases, problems such as black line hardly occur. If it occurs, the signal is different between adjacent lines, that is, it corresponds to a boundary where the display state is switched, and therefore, it is difficult to visually recognize the problem, and there is no problem.

However, in the case of a display device compatible with color display, the adjacent signal line (b) generally corresponds to a pixel of a color different from that of the signal line (c). In this case, The signal levels of adjacent lines are not necessarily similar.
Therefore, the input side of the auxiliary signal line switching element SWc2 is preferably connected to the signal line corresponding to the pixel of the same color as the pixel corresponding to the signal line c and located in the adjacent block and located closest to the signal line c. . According to this structure, since the signal level supplied for inverting the polarity in advance is a normal display signal of the adjacent signal line of the same color, it may be the same or similar to the normal display signal of the signal line. In many cases, the problem of blackening does not occur. If it occurs, the signal is different between adjacent lines, that is, it corresponds to a boundary where the display state is switched, and therefore, it is difficult to visually recognize the problem, and there is no problem.

In the present embodiment, similarly to the second embodiment, the driving waveform is as shown in FIG. 4, and Ecp <Eb.

The active matrix substrate according to the present invention includes a plurality of pixel electrodes formed on the substrate, a pixel switching element individually connected to the pixel electrode, and a plurality of scans for driving the pixel switching element. A plurality of signal lines connected to a pixel electrode via the pixel switching element, a plurality of signal line switching elements each having one end individually connected to the plurality of signal lines, and a plurality of signal line switching elements. A signal input portion electrically connected to an end, a signal line branch portion provided between the signal input portion and the signal line switching element, and commonly connected to a plurality of the signal line switching elements for each block. A block and an adjacent block in an active matrix substrate having a control wiring for switching between conduction and non-conduction of the signal line switching element. The signal line on the boundary with the block is connected to the signal line switching element controlled by the control wiring of the own block, and is also connected to another signal line switching element controlled by another control wiring. May be configured.

Further, in the active matrix substrate according to the present invention, in the above configuration, the control line of the adjacent block is supplied with a conduction signal earlier than the control line of its own block within the horizontal period. May be connected to a signal line switching element controlled by a control wiring of the own block, and may also be connected to another signal line switching element controlled by another control wiring.

Further, in the active matrix substrate according to the present invention, in the above structure, the another control wiring is a control wiring of another block to which a conduction signal is supplied earlier than the control wiring of the own block in the horizontal period. It may be configured as follows.

Further, in the active matrix substrate according to the present invention, in the above structure, the another control wiring is supplied with a conduction signal earlier than the control wiring of the own block in the horizontal period. May be configured.

Further, in the active matrix substrate according to the present invention, in the above configuration, the other end of the another signal line switching element is the same as the other end of the signal line switching element controlled by the control wiring of the own block. You may comprise so that it may be electrically connected to the signal input part.

Further, in the active matrix substrate according to the present invention, in the above structure, the other end of the another signal line switching element is connected to the other end of the signal line switching element connected to an adjacent signal line across the block. You may comprise so that it may be electrically connected to the same signal input part.

Further, in the active matrix substrate according to the present invention, in the above configuration, the other end of the another signal line switching element supplies a signal to a pixel which should display the same color as a pixel electrode connected to the signal line. And is electrically connected to the same signal input portion as the other end of the signal line switching element connected to another signal line located in the adjacent block and closest to the signal line. Is also good.

In the active matrix substrate according to the present invention, in the above configuration, the signal line switching element may have a lower resistance when conducting than the another signal line switching element.

[0077]

As described above, in the active matrix substrate of the present invention, at least one of at least two adjacent blocks has a control wiring of an adjacent block earlier than a control wiring of its own block within one horizontal period. In the block to which the data signal is supplied, the signal line in the own block on the boundary with the adjacent block is controlled by receiving the supply of the auxiliary conduction signal through another auxiliary control wiring different from the control wiring of the own block. By another auxiliary signal line switching element different from the signal line switching element controlled by the control wiring of the own block, before the end of the data signal supply to the adjacent block within one horizontal period, as a pre-line. And a supply of a pre-row polarity inversion signal for inverting the polarity of the signal line voltage of the own block.

As a result, since the polarity of the signal line can be inverted in advance, the pixel on the boundary line is written in a state where the potential has fluctuated as described above, and this is held over the display period. Does not occur. Therefore, it is possible to reduce an inconvenience that the display state is different from that of the periphery even when the same potential is supplied to the periphery of the block.

In the active matrix substrate according to the present invention, in addition to the above-described structure, at least two signal lines adjacent to each other on a boundary between the blocks are connected via the auxiliary signal line switching elements. The same pre-feed polarity inversion signal is supplied to each other, and within one horizontal period, the pre-feed signal is supplied to the signal line of the earlier block of the adjacent block among the adjacent blocks. This is a configuration in which the supply of the polarity inversion signal ends.

Thus, no matter which block receives the supply of the data signal first, the polarity inversion period due to the supply of the data signal does not overlap with the polarity inversion period of the preceding row. Therefore, in addition to the effect of the above configuration, even when the scanning of the image data is performed from both the left and right, and the selection order of the control wiring may be changed, as described above, the same potential as the surroundings is obtained at the boundary of the block. However, it is possible to reduce the problem that the display state is different from that of the surroundings despite the supply of the information.

In the active matrix substrate according to the present invention, in addition to the above configuration, the auxiliary control line is a control line of another block to which a conduction signal is supplied earlier than the control line of the own block in the horizontal period. There is a certain configuration.

Thus, the control wiring can also serve as the auxiliary control wiring. Therefore, in addition to the effect of the above configuration,
There is no need to generate a special control signal externally and supply it to another signal line switching element, which eliminates the need for complicated control circuits and the layout of control wiring. Play.

In the active matrix substrate according to the present invention, in addition to the above configuration, the auxiliary control wiring is supplied with a conduction signal prior to the control wiring of the own block in the horizontal period. The configuration is as follows.

Thus, the auxiliary control wiring and the control wiring of the adjacent block can be shared. Therefore, in addition to the effect of the above configuration, since the control wiring of another signal line switching element only needs to extend the control wiring of the adjacent block by a small distance, the arrangement of the pattern is extremely easy. Play.

In the active matrix substrate according to the present invention, in addition to the above configuration, the terminal of the auxiliary signal line switching element which is not connected to the signal line is controlled by the control wiring of the own block. This is a configuration in which the terminal of the signal line switching element that is not connected to the signal line is electrically connected to the same signal input unit to which the terminal is connected.

Thus, the data signal input to the own block from the signal input unit can also serve as the reversal signal of the own block. Therefore, in addition to the effect of the above configuration, there is no need to provide a signal input portion to the other end of the another signal line switching element, so that the structure is simple.

In the active matrix substrate according to the present invention, in addition to the above configuration, the terminal of the auxiliary signal line switching element that is not connected to the signal line is connected to an adjacent signal line across blocks. In this configuration, the terminal of the connected signal line switching element that is not connected to the signal line is electrically connected to the same signal input unit to which the terminal is connected.

Thus, the data signal input to the adjacent block from the signal input unit can also serve as the pre-polarity inverted signal of the own block. Therefore, in addition to the effect of the above configuration, since the signal level supplied in advance is a normal display signal of the adjacent line, it is often the same or similar to the normal display signal of the signal line. This has the effect that the problem is more unlikely to occur.

Further, in the active matrix substrate according to the present invention, in addition to the above configuration, the terminal of the auxiliary signal line switching element that is not connected to the signal line is connected to the pixel electrode connected to the signal line. A signal line switching element that supplies a data signal to a pixel to be displayed in the same color and is connected to another signal line located in the adjacent block and located closest to the signal line, which is not connected to the signal line Are electrically connected to the same signal input unit to which the terminals are connected.

As a result, the data signal of the same color input to the adjacent block from the signal input unit can also serve as the reversal polarity inversion signal of the own block. therefore,
In addition to the effect of the above configuration, since the signal level supplied in advance is the same display signal of the same color on the adjacent line, it is more often the same or similar to the normal display signal of the signal line, and the black line This brings about an effect that the problem such as formation becomes more difficult to occur.

Further, in the active matrix substrate of the present invention, in addition to the above configuration, the signal line switching element has a lower resistance when conducting than the auxiliary signal line switching element.

Accordingly, it is necessary to previously form the auxiliary signal line switching element for inverting the polarity to have the same size as the signal line switching element for supplying the normal polarity inversion signal, and to increase the resistance so as to sufficiently reduce the resistance. Absent. Therefore, in addition to the effect of the above configuration, there is an effect that the auxiliary signal line switching element can be easily spatially arranged.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration example of an equivalent circuit of an active matrix substrate.

FIG. 2 is an explanatory diagram showing a timing chart of driving using the active matrix substrate of FIG. 1;

FIG. 3 is an explanatory diagram illustrating a configuration example of an equivalent circuit of an active matrix substrate.

FIG. 4 is an explanatory diagram showing a timing chart of driving using the active matrix substrate of FIG. 3;

FIG. 5 is an explanatory diagram illustrating a configuration example of an equivalent circuit of an active matrix substrate.

FIG. 6 is an explanatory diagram showing a configuration example of an equivalent circuit of an active matrix substrate.

FIG. 7 is an explanatory diagram showing a configuration example of an equivalent circuit of a conventional active matrix substrate.

FIG. 8 is an explanatory diagram showing a timing chart of driving using a conventional active matrix substrate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Signal line drive circuit (signal input part) 2 Auxiliary control wiring 3 Inversion signal line (auxiliary inversion data supply line) 7 Signal line branch part a, b, c, d, e, e ', f, f' signal line g _1, g ₂ scan lines _{A 1, B 1, C 1} , D 1, A 2, B 2, C 2, D 2
Pixels _{s 1, s 2, s 3} , s 4 output lines SW _1, SW ₂ control lines SWa, SWb, SWc, SWd signal line switching element SWb2, SWc2 auxiliary signal line switching element SW _P subsidiary conduction signal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 642 G09G 3/20 642A 680 680G F term (Reference) 2H093 NA32 NA33 NC22 NC23 NC27 NC34 ND05 ND49 ND50 5C006 AC27 AC28 AF71 BB14 BB16 BC03 BC12 BC20 BF03 BF22 BF26 BF31 FA22 FA43 FA51 5C080 AA10 BB05 DD05 DD22 DD27 FF11 JJ02 JJ04

Claims (8)

[Claims] 1. A pixel switching element connected to each of a plurality of pixel electrodes, a plurality of scanning lines for driving the pixel switching element, and a plurality of data signals applied to the pixel electrode via the pixel switching element. And a signal input unit for supplying the data signal to the signal line and inverting the polarity of the voltage of the signal line, wherein the signal line is blocked according to the timing at which the data signal is supplied within one horizontal period. A signal line branching unit that branches the data signal from the signal input unit into each of the blocks;
A signal line switching element that switches on / off the supply of a data signal from the signal line branching section to each of the signal lines by being switched between conduction and non-conduction, and a conduction signal provided to each of the blocks, and a conduction signal is supplied to the signal line switching element. An active matrix substrate having a supply line and a control line for switching the conduction / non-conduction of the signal line switching element for each block according to the supply timing of the data signal; and for at least one of at least two adjacent blocks, For a block to which the control signal of the adjacent block is supplied with the data signal earlier than the control line of the own block within one horizontal period, the signal line in the own block on the boundary line with the adjacent block is A separate auxiliary control wiring different from the control wiring By the auxiliary signal line switching element different from the signal line switching element controlled by the control wiring of the own block, which is controlled by receiving the supply, from the end of the data signal supply to the adjacent block within one horizontal period An active matrix substrate, characterized in that the active matrix substrate is supplied with a pre-inversion polarity inversion signal for inverting the polarity of the signal line of the own block as a pre-execution. 2. The two signal lines on at least two adjacent blocks, which are on the boundary of the blocks, are supplied with the same preceding polarity reversal signal through the auxiliary signal line switching elements. The supply of the preceding polarity reversal signal is completed by the start of the data signal supply to the signal line of the earlier block of the adjacent block within the one horizontal period. 2. The active matrix substrate according to 1. 3. The active matrix substrate according to claim 1, wherein said auxiliary control wiring is a control wiring of another block to which a conduction signal is supplied earlier than a control wiring of the own block in a horizontal period. 4. The auxiliary control line is supplied with a conduction signal earlier than the control line of the own block in a horizontal period.
4. The active matrix substrate according to claim 3, wherein the active matrix substrate is a control wiring of an adjacent block. 5. The terminal of the auxiliary signal line switching element which is not connected to the signal line is connected to the signal line switching element controlled by the control wiring of the own block.
5. The active matrix substrate according to claim 1, wherein the terminal not connected to the signal line is electrically connected to the same signal input portion to which the terminal is connected. 6. A terminal of the auxiliary signal line switching element which is not connected to a signal line is not connected to a signal line of a signal line switching element connected to an adjacent signal line straddling a block. The active matrix substrate according to claim 1, wherein the active matrix substrate is electrically connected to the same signal input portion to which the other terminal is connected. 7. A terminal of the auxiliary signal line switching element, which is not connected to the signal line, supplies a data signal to a pixel to be displayed in the same color as a pixel electrode connected to the signal line, and supplies the data signal to an adjacent pixel. In the same signal input section as the terminal not connected to the signal line is connected to the signal line switching element connected to another signal line located closest to the signal line in the block. The active matrix substrate according to any one of claims 1 to 4, wherein the active matrix substrate is electrically connected. 8. The active matrix substrate according to claim 1, wherein said signal line switching element has a lower resistance when conducting than said auxiliary signal line switching element.