JP2000338463A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the vertical resolution apparently and make a stroke stronger by applying to 2nd source wiring with an applied potential which is an intermediate potential between the potentials applied to two pieces of source wiring and reversed in polarity. SOLUTION: An intermediate potential generating circuit 62 produces an intermediate potential between those of conventional neighbor data output lines 17 from them and reversed in polarity. When the resistance of a resistor 65 is made twice that of a resistor 66, Yn of conventional data output line 17 and the new data output line Zn satisfy a relation Z1=-(Y1+Y2)/2, and an intermediate potential with polarity opposite to that of the conventional data output line 17 is outputted from a new data output line 61. The outputs Y1-Yn of the conventional data output lines 17 are connected with conventional source wiring 3 on a liquid crystal panel, and the outputs Z1-Zn of the new data output lines are connected with source wiring. Thus, a liquid crystal display device can be realized where the vertical resolution is apparently twice as high as the conventional resolution and is strong against a stroke.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring and a structure for a liquid crystal display device, which are high in resolution against crosstalk and capable of displaying an intermediate gradation.

[0002]

2. Description of the Related Art One trend in liquid crystal display devices is to increase the size of a display screen. When increasing the display screen size, there are the following two options regarding the size of the display pixel.

(A) The resolution is the same as before. Therefore, the size of one pixel becomes larger than before.

(B) The size of one pixel is the same as the conventional one. Therefore, the resolution is increased.

In the case of option A, since the size of one pixel is large, for example, when a diagonal line is displayed, the display state is coarse for human beings, and the display contents are difficult to see, such as a noticeable step difference for each pixel. . Therefore, if it is true, it is desired to select the option B. In this case, however, there is a problem that the driving IC for driving the liquid crystal panel must be compatible with a high frequency.

One method of increasing the display resolution without increasing the frequency of driving the liquid crystal panel is disclosed in
9091 has been proposed. FIG. 4 shows a part of the liquid crystal panel described in the publication.

In the figure, 1 is a liquid crystal panel, 2 is TF
T, 3 denotes a source wiring, 4 denotes a gate wiring, 5 denotes a conventional pixel electrode, and 6 denotes a new pixel electrode. The TFT 2 is a TFT that controls driving of the liquid crystal. The source wiring 3 is a wiring for transmitting a display image signal. The gate wiring 4 is a wiring for sequentially scanning the scanning lines and transmitting a signal for displaying an image signal on the source wiring for each horizontal line. The conventional pixel electrode 5 is a pixel electrode that has existed from the conventional design. The new pixel electrode 6 is a newly provided pixel electrode. G ₁ , G ₂ , G ₃ ,... Are gate wirings. S ₁ ,
S _2, S _3, ... is a source _{wiring, P 11, P 12, P} 13 is a conventional pixel electrode 5 in this, ... it is connected through the TFT 2. A new pixel electrode 6 is provided between two conventional pixel electrodes 5 (for example, P ₁₁
And the like N ₁₁ between P _12). N ₁₁ which is a new pixel electrode 6
Are the conventional pixel electrodes 5 on both sides, P ₁₁ , P ₁₂ and TF
It is connected via T2. Therefore, N ₁₁ is polar and P _11, P ₁₂ is a conventional pixel electrode 5 sandwiching the are the same intermediate potential. In Japanese Patent Application Laid-Open No. 2-79091, the vertical resolution is simulated by such a method without increasing the frequency of driving the liquid crystal panel 1 and without increasing the number of signal input terminals from the signal drive circuit board to the liquid crystal panel 1. It is possible to make it twice as large.

Next, FIG. 5 shows a schematic block diagram of a conventional driving IC which does not use the method as disclosed in Japanese Patent Laid-Open No. 2-79091. In the figure, 11 is a shift register, 12
Is a latch, 13 is a DA converter, 14 is an output circuit, 1
5 is a data input line, 16 is an LD (data load) line, 1
7 indicates a data output line.

In FIG. 1, only the data input line 15 and the data output line 17 are shown, and other timing lines and the like are omitted. Also, for simplicity of explanation, monochrome 3 bit (8
(Gradation). The wiring with the diagonal lines and the number 3 indicates that it is 3 bits. Y _{1 to} Y _n are data output lines 17 of the driving IC, which are connected to signal input terminals of the liquid crystal panel 1. Gradation information digital signal to the drive IC is input to the three data input lines 15 from D ₀ to D _2. The input digital signal is transmitted to the shift register 11
Thus, the data is sequentially written to the latches 12 corresponding to the respective source addresses. When the digital signals of all the addresses are written into the latch 12, the digital signals are output to the DA converter 13 with the data load signal of the LD line 16 as a trigger. The DA converter 13 converts the input digital signal into an analog signal corresponding to the gradation information and outputs the analog signal. The output from the DA converter 13 is output to the Y ₁ to Y _n of the final data output line 17 through the output circuit 14.

[0010]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 2-79.
In the method of 091, the potential of the conventional source wiring 3 needs to have the same polarity, and it is impossible to cope with a driving method such as column inversion or dot inversion. For this reason, there is a problem that the margin for the horizontal crosstalk is small. Hereinafter, this will be described.

In general, a liquid crystal used in a liquid crystal display device has a property that its characteristics gradually deteriorate when a direct current is continuously applied. For this reason, in liquid crystal driving, a method is generally adopted in which the polarity of the potential applied to each pixel electrode is reversed for each frame so that the characteristics are hardly deteriorated. In the liquid crystal display device, one screen is rewritten every 1/60 second, but the display of one screen is generally called one frame. There are four methods of inverting the polarity for each frame, which are called frame inversion, column inversion, row inversion, and dot inversion, respectively. Below,
These inversion driving methods will be described. FIG. 6 (a)
From (b) to (a) and (b) in FIG.
1 is a liquid crystal panel, 21 is a pixel electrode, 22 is a pixel electrode 21
Indicates the polarity of the potential. + Is the polarity 2 of the potential of the pixel electrode 21
2 indicates positive and-indicates negative.

FIGS. 6A and 6B show frame inversion. In the first frame, a positive polarity 22 is given to all the pixel electrodes 21 as shown in FIG.
In the second frame, as shown in FIG. 6B, the negative polarity 22 is given to all the pixel electrodes 21 contrary to the first frame. As described above, the method of reversing the polarity 22 of the potential applied to all the pixel electrodes 21 for each frame is frame inversion.

FIGS. 7A and 7B show column inversion. In the first frame, as shown in FIG. 7A, the polarities 22 of the pixel electrodes 21 are provided so as to be reversed for each column. In the second frame, as shown in FIG. 7B, a polarity 22 opposite to that of the first frame is given for each column. As described above, the method of inverting the polarity 22 of the potential applied to the pixel electrode 21 of each column for each frame is column inversion.

FIGS. 8A and 8B show row inversion. In the first frame, as shown in FIG. 8A, the polarity 22 of the pixel electrode 21 is provided for each row so as to be opposite. In the second frame, as shown in FIG. 8B, the polarity 22 opposite to that of the first frame is given for each row. As described above, the method of inverting the polarity 22 of the potential applied to the pixel electrode 21 in each row for each frame is row inversion.

FIGS. 9A and 9B show dot inversion. In the first frame, as shown in FIG. 9A, the polarity 22 is given to each adjacent pixel electrode 21 so that the polarity 22 is reversed (inverse to the upper, lower, left and right pixel electrodes 21). The polarity of the second frame is opposite to that of the first frame.
2 is provided for each pixel electrode 21. As described above, the method of reversing the polarity 22 of the potential applied to each pixel electrode 21 for each frame is dot inversion.

Although the frame inversion is sufficient for the purpose of preventing the deterioration of the liquid crystal, the frame inversion has a disadvantage that it is vulnerable to crosstalk. Here, crosstalk will be described. In FIGS. 10A and 10B, 1 is a liquid crystal panel, 31 is a black display area, 32 is a white display area, and 33 is an area displayed slightly black.

The crosstalk in the frame inversion is
When the background is displayed white and a black pattern is displayed only in the central area as shown in FIG. 10A, the actual display state is such that the upper, lower, left and right areas 33 of the central black area are displayed as shown in FIG. This is a phenomenon in which a white display is originally made, but a slightly black display is made. In the column inversion, when the display is performed as shown in FIG. 10A, the area in the vertical direction is displayed slightly black with respect to the center black display area 31. In the row inversion, when the display is performed as shown in FIG. 10A, the region in the left-right direction is displayed slightly black with respect to the black display region 31.

The reason will be described by taking row inversion as an example. FIG. 11 shows a schematic circuit block diagram of a liquid crystal display device. In this figure, 2 is a TFT, 3 is a source wiring, 4
Denotes a gate wiring, 21 denotes a pixel electrode, 41 denotes a TFT glass substrate, 42 denotes a color filter, and 43 denotes a common electrode. T
The pixel electrode 21 is provided on the FT glass substrate 41. A common electrode 43 is provided below the color filter 42. The potential difference between the common electrode 43 and the pixel electrode 21 controls the orientation of the liquid crystal sandwiched between them and changes the light transmittance. The larger the potential difference is, the blacker the pixel is displayed (the same black display is performed regardless of whether the polarity of the potential difference is negative or positive). The closer the potential difference is to 0 V, the whiter the pixel becomes. Here, a black display area 31 is provided in the center of the liquid crystal panel 1 as shown in FIG. In this figure, reference numeral 51 denotes a row line of interest, 52 denotes a black display area on the row line 51, and 53 denotes a white display area on the row line 51. + Indicates that the polarity 22 of the potential of the pixel electrode 21 is positive, and-indicates that it is negative. Row line 5
Paying attention to 1, in the black display area 52 on the row line 51, the potential difference between the pixel electrode 21 and the common electrode 43 is large. Moreover, the polarity 22 of the potential of the pixel electrode 21 in the black display area 52 is the same because of the row inversion. Therefore, the potential of the common electrode 43 shifts due to the capacitive coupling between the common electrode 43 and the pixel electrode 21. Due to this effect, a small potential difference is generated between the pixel electrode 21 of the white display area 53 which should be originally 0 V and the corresponding common electrode 43.
That is, the display state of the white display area 53 is not completely white. In the column inversion, when the display is performed as shown in FIG. 12A, the vertical region of the black display region 52 which is originally the white display region 32 is displayed slightly black.

On the other hand, in the case of dot inversion, the black display area 31
The polarity 22 of the potential of each pixel electrode 21 of FIG.
As shown by, on the row line 51, it is the opposite of that on both sides. Therefore, the average potential difference of each pixel electrode 21 with respect to the common electrode 43 in the black display region 31 is 0V. Up to now, the horizontal direction has been described, but in the case of dot inversion, the same applies to the vertical direction. Therefore, even if there is capacitive coupling between the common electrode 43 and the pixel electrode 21, the potential of the common electrode 43 does not deviate. That is, no crosstalk occurs.

As described above, dot inversion is the strongest in both vertical crosstalk and horizontal crosstalk.
Despite these advantages, dot inversion requires a high IC driving capability, and thus, this driving method has not always been adopted conventionally. However, it is expected that dot inversion will be increasingly used in the future to satisfy the demand for high display performance from the market.

Here, looking back on the above-mentioned Japanese Patent Application Laid-Open No. 2-79091, as shown in FIG. 4, the polarity 22 of the potential of the conventional source wiring S1 and S2 needs to be the same. Therefore, in the technique of JP-A-2-79091, only frame inversion or row inversion drive can be adopted. Therefore, JP-A-2-79091 has a problem that it is susceptible to horizontal crosstalk.

As another problem, there is a difficulty in control due to the non-linear relationship between the potential difference between the pixel electrode 21 and the common electrode 43 and the light transmittance. Hereinafter, this will be described.

The basic principle of the liquid crystal display device is to change the light transmittance by controlling the alignment of the liquid crystal by the potential difference between the pixel electrode 21 and the common electrode 43 as described above. However, in general, the relationship between the potential difference between the pixel electrode 21 and the common electrode 43 and the light transmittance is generally non-linear as shown in FIG. Thus in Figure 4, even if the potential of the N ₁₁ is a novel pixel electrode 6 in the conventional intermediate pixel electrode 5 a is P ₁₁ and P ₁₂ of the two neighboring display gradation of the pixel from the N ₁₁ occurs prior a is P ₁₁ and not necessarily to be a halftone pixel resulting from P ₁₂ pixel electrode 5.

In the method disclosed in Japanese Patent Application Laid-Open No. 2-79091, it is difficult to make the display gradation of the pixel generated from the new pixel 6 an accurate intermediate gradation between the pixels generated from the adjacent pixel electrodes 5 on both sides. It is.

The present invention has been made in order to solve the above-mentioned problems in the conventional liquid crystal display device. The liquid crystal display device which can increase the vertical resolution without increasing the driving frequency, and is resistant to crosstalk. An apparatus is provided.

The present invention does not provide a new pixel electrode 6 with an intermediate potential of the conventional pixel electrode 5 sandwiching it,
An object of the present invention is to provide a liquid crystal display device which gives a potential for setting a display gray level of a pixel generated from a new pixel electrode 6 to an intermediate level between pixels sandwiching the pixel electrode 6 and displays an accurate intermediate gray level.

[0027]

According to a first aspect of the liquid crystal display device of the present invention, a plurality of parallel source wirings, a plurality of parallel gate wirings orthogonal to the source wirings, a source wiring and a gate wiring are provided. An active matrix type liquid crystal display device comprising a pixel electrode provided corresponding to an intersection, and driving each pixel electrode by a TFT, wherein a second source line and a second source line are provided alternately in the middle of each of the source lines. A second pixel electrode provided corresponding to each intersection of the second source line and the gate line and a potential intermediate between potentials applied to two source lines adjacent to the second source line and having a polarity. A circuit for generating a reverse applied potential and applying the generated potential to the second source wiring.

In a second configuration of the liquid crystal display device of the present invention, a circuit for generating an intermediate potential of the opposite polarity in the first configuration is provided on a signal line drive circuit board connected to a liquid crystal panel.

In a third configuration of the liquid crystal display device of the present invention, a circuit for generating an intermediate potential of the opposite polarity in the first configuration is provided on a liquid crystal panel.

In a fourth configuration of the liquid crystal display device of the present invention, a circuit for generating an intermediate potential of the opposite polarity in the first configuration is provided.
A circuit that calculates and generates an applied voltage in which the gray level of a pixel corresponding to the second source line is intermediate between the gray levels of two pixels corresponding to adjacent two adjacent source lines. It is.

In a fifth configuration of the liquid crystal display device of the present invention, a circuit for calculating and generating an intermediate gradation potential applied to the second source line in the fourth configuration is provided on a liquid crystal panel. is there.

[0032]

Embodiment 1 FIG. 1 is a schematic circuit block diagram showing an example of an embodiment of a liquid crystal display device of the present invention. In the figure, 14 is an output circuit, 17 is a data output line, 61 is a new data output line (also referred to as a second data output line), 62 is an intermediate potential generating circuit, 63 is an operational amplifier, and 64 is a grounded operational amplifier. , 6
5 indicates a resistor, and 66 indicates a resistor.

For simplicity of explanation, monochrome 3 bits
(8 gradations) will be described. Also, the part before the output circuit 14
The details are omitted because they are the same as in the above-mentioned conventional technology. Signal line
The intermediate potential generation circuit 62 provided on the drive circuit board
From the adjacent data output lines 17 on both sides,
Conversely, it is a circuit that generates an intermediate potential. With an intermediate potential
For example, the average potential may be used. Here, the resistor 65
When the resistance value is twice the resistance value of the resistor 66, the conventional data
Y which is the output line 17_nAnd a new data output line 61
The relation of Zn is Z₁=-(Y₁+ Y_Two) / 2 and new
The data output line 61 to the conventional data output line 17 and the opposite polarity
An intermediate potential is output. The circuit shown in FIG.
Since it is provided on the moving circuit board, the conventional data output line 17
Some Y1 to Y_nOutput of the conventional source distribution on the LCD panel
A new data output line 61, Z, connected to line 3₁~
Z_nIs output from a new source line 71 on the liquid crystal panel 1.
(Also referred to as a second source wiring, not shown).
You. As a result, the resolution in the vertical direction is simulated by the conventional 2
Realizes a liquid crystal display device that is twice as strong as crosstalk
Wear. In this description, a monochrome display has been described as an example.
However, in the case of color display, R ₁(Conventional) → G₁(Conventional) →
B₁(Conventional) → R '₁(New) → G '₁(New) → B '
₁(New) → R_Two(Conventional) → G_Two(Conventional) → B_Two(Conventional) →
G '_Two(New) → ... for every 3 blocks
If the structure is repeated as₁And R_Two, G₁And G_Two, B
₁And B_TwoFrom each of the conventional wiring R₁, R_TwoAgainst
The intermediate potential of the opposite polarity is R '₁, G '₁, B '₁Output to
The circuit is provided as follows.

Embodiment 2 FIG. 2 is a schematic circuit block diagram showing an example of an embodiment of the liquid crystal display device of the present invention. In this figure, 1 is a liquid crystal panel, 2 is a TFT, 3 is a conventional source wiring, 4 is a gate wiring, 5 (P ₁₁ , P _21, etc.) are conventional pixel electrodes, 6
(N ₁₁ , N _21, etc.) indicate a new pixel electrode (also referred to as a second pixel electrode), and 71 indicates a new source wiring (also referred to as a second source wiring). In the first embodiment of the connection terminals of the signal line driver circuit board and the liquid crystal panel 1 becomes 2n present need of Y ₁ to Y _n and Z ₁ to Z _n. For this reason, there is a problem that twice as many terminals as in the related art must be provided in the limited space of the liquid crystal panel 1. In order to avoid this problem, in the present embodiment, the intermediate potential generation circuit 62 is provided on the liquid crystal panel 1. The intermediate potential generating circuit 62 is formed at the same time when the TFT 2 is formed on the liquid crystal panel 1. The intermediate potential generation circuit 62 is a conventional source line 3
From the input signals of S1 and S2, an intermediate potential having a polarity opposite to that of the input signals is output to a new source wiring 71. This makes it possible to realize a liquid crystal display device in which the number of terminals for connecting the signal line drive circuit board and the liquid crystal panel 1 is unchanged, the resolution in the vertical direction is twice as large as the conventional one, and the crosstalk is strong.

Embodiment 3 FIG. 3 is a schematic circuit block diagram showing an example of an embodiment of the liquid crystal display device of the present invention. In this figure, 11 is a shift register, 12 is a latch, 13 is a DA converter,
Reference numeral 14 denotes an output circuit, reference numeral 15 denotes a data input line, reference numeral 17 denotes a data output line, reference numeral 81 denotes an intermediate gradation operation circuit, reference numeral 82 denotes a DA converter B, and reference numeral 83 denotes an output circuit B. In this figure, an intermediate gray scale operation circuit 81 for outputting an intermediate gray scale signal from two conventional input signals is composed of a latch 12 and a DA converter 1.
3 are provided. Generally, in a liquid crystal display device,
Since the relationship between the potential difference between the pixel electrode 21 and the common electrode 43 and the light transmittance is nonlinear as shown in FIG.
New source line 7 sandwiched between two conventional source lines 3
Even if an average potential is applied to 1 as an intermediate potential between them,
The display gradation of the pixel connected thereto is not necessarily the gradation intermediate between the adjacent pixels. In order to avoid this problem, in the present embodiment, an arithmetic circuit for optimizing gray scale and displaying an intermediate gray scale is provided in the signal line driving circuit. The operation will be described below.

The input signals D _{0 to} D ₂ are supplied to the shift register 11
5 is the same as the conventional signal line drive circuit of FIG. In the present embodiment, an intermediate gray scale operation circuit 81 for calculating an intermediate gray scale of adjacent outputs is provided at the output stage of the latch 12. Since this arithmetic circuit is a logic circuit that outputs one 3-bit data from two 3-bit data inputs, it can be realized within the range of the related art. However, the use of three bits here is merely an example, and any number of bits may be used. The output of the arithmetic circuit is input to the DA converter B82, its output via the output circuit B83, and output to new data output lines Z ₁ to Z _n. Z _{1 to} Z _n are connected to a new source wiring 71 of the panel.

According to this method, the intermediate gradation calculation circuit 81
Is appropriately determined, the non-linear relationship between the potential difference between the common electrode 43 and the pixel electrode 21 and the light transmittance is corrected, and the intermediate gradation potential of the adjacent conventional data output line 17 is output as a new data output. It becomes possible to output to the line 61. As a result, it is possible to realize a liquid crystal display device in which the resolution in the vertical direction is twice as large as that of the related art and which can display an accurate halftone.

[0038]

According to the liquid crystal display device of the present invention, the applied potential of the new wiring is the potential opposite to the polarity of the conventional wiring for transmitting the display signals adjacent to each other. Is provided, the vertical resolution can be artificially doubled as compared with the related art, and the resistance to crosstalk can be increased.

According to the liquid crystal display device of the present invention, a circuit for generating a new potential applied to a data output line from a potential applied to a conventional data output line is provided on a signal line drive circuit board connected to a liquid crystal panel. As a result, the vertical resolution can be doubled in a pseudo manner, and the crosstalk can be further enhanced.

According to the liquid crystal display device of the present invention, a circuit for generating a new applied potential of the source wiring from the applied potential of the conventional source wiring is provided on the liquid crystal panel, so that the circuit from the signal line driving circuit board to the liquid crystal panel is provided. Without increasing the number of signal input terminals of the conventional technology.
It can be doubled and can be more resistant to crosstalk.

According to the liquid crystal display device of the present invention, the arithmetic circuit for calculating the applied potential of the intermediate gradation from the applied potential of the conventional data output line to the new data output line is connected to the signal line connected to the liquid crystal panel. By providing on the drive circuit board,
Absorbs the non-linear relationship between the potential difference between the pixel electrode and the common electrode and the light transmittance, and outputs the applied potential of the intermediate gradation between adjacent data output lines to a new data output line. An intermediate gradation can be displayed.

According to the liquid crystal display device of the present invention, the arithmetic circuit for calculating the applied potential of the intermediate gray scale from the applied potential of the conventional source wiring to the new source wiring is provided on the liquid crystal panel. Absorb the non-linear relationship between the potential difference between the pixel electrode and the common electrode and the light transmittance without increasing the number of signal input terminals from the drive circuit board to the liquid crystal panel.
The applied potential of the intermediate gray scale of the adjacent source wiring can be output to a new data output line, and the intermediate gray scale can be displayed more accurately than before.

[Brief description of the drawings]

FIG. 1 is a schematic circuit block diagram illustrating an example of an embodiment of a liquid crystal display device of the present invention.

FIG. 2 is a schematic circuit block diagram illustrating an example of an embodiment of a liquid crystal display device of the present invention.

FIG. 3 is a schematic circuit block diagram illustrating an example of an embodiment of a liquid crystal display device of the present invention.

FIG. 4 is a schematic circuit block diagram showing a part of a conventional liquid crystal display device.

FIG. 5 is a schematic circuit block diagram of a conventional liquid crystal display device.

6A and 6B are diagrams showing a change in polarity of a potential of a pixel electrode for each frame in a frame inversion method in a conventional liquid crystal display device, and FIG. 6A is a diagram showing a first frame; FIG. 6B shows the second frame.

7A and 7B are diagrams showing a change in the polarity of the potential of the pixel electrode for each frame in a column inversion method in a conventional liquid crystal display device, and FIG. 7A is a diagram showing a first frame; FIG. 7B shows the second frame.

8A and 8B are diagrams showing a change in polarity of a potential of a pixel electrode for each frame in a row inversion method in a conventional liquid crystal display device, and FIG. 8A is a diagram showing a first frame; FIG. 8B shows the second frame.

FIG. 9 is a diagram showing a change in polarity of a potential difference between pixel electrodes for each frame in a dot inversion method in a conventional liquid crystal display device for each frame, and FIG. 9A is a diagram showing a first frame; FIG. 9B shows the second frame.

FIG. 10 is a diagram illustrating crosstalk in frame inversion in a conventional liquid crystal display device.

FIG. 11 is a schematic circuit block diagram showing a conventional liquid crystal display device.

FIG. 12 is a diagram illustrating a potential difference between a common electrode and a pixel electrode in a row inversion method and a dot inversion method.

FIG. 13 is a diagram showing a relationship between a potential difference between a common electrode and a pixel electrode and light transmittance.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 TFT 3 Source wiring 4 Gate wiring 5 Conventional pixel electrode 6 New pixel electrode 11 Shift register 12 Latch 13 DA converter 14 Output circuit 15 Data input line 16 LD line 17 Data output line 21 Pixel electrode 22 Polarity 31 Black Display area 32 White display area 33 Area displayed slightly black 41 TFT glass substrate 42 Color filter 43 Common electrode 51 Row line 52 Black display area 53 White display area 61 New data output line 62 Intermediate potential generation circuit 63 Operational amplifier 64 Ground 65 resistor 66 resistor 71 new source wiring 81 halftone arithmetic circuit 82 DA converter B 83 output circuit B

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) G09G 3/20 623 G09G 3/36 3/36 G02F 1/136 500 F term (Reference) 2H092 GA60 NA01 2H093 NA16 NA43 NA53 NC12 NC13 NC22 NC26 NC34 ND06 ND15 ND20 ND52 NE07 5C006 AA11 AC21 AC26 AF43 BB16 BC11 BF25 FA36 5C080 AA10 BB06 DD07 DD10 EE29 FF11 GG12 JJ01 JJ02 JJ03 JJ05 JJ06 5C094 AA05 AA04 EA03 DB09 CA03 DB01

Claims (5)

[Claims] A plurality of parallel source wirings, a plurality of parallel gate wirings orthogonal to the source wirings, and a pixel electrode provided at each intersection of the source wirings and the gate wirings. An active matrix type liquid crystal display device in which a pixel electrode is driven by a TFT, wherein a second source line alternately provided in the middle of each of the source lines, and an intersection of the second source line and the gate line And an applied potential having a polarity opposite to that of the applied potential of the second pixel electrode provided corresponding to the second source wiring and the potential applied between the two source wirings adjacent to the second source wiring. A liquid crystal display device comprising: a circuit for applying a voltage to the second source line. 2. The liquid crystal display device according to claim 1, wherein a circuit for generating the intermediate potential of the opposite polarity is provided on a signal line driving circuit board connected to a liquid crystal panel. 3. The liquid crystal display device according to claim 1, wherein a circuit for generating the intermediate potential of the opposite polarity is provided on a liquid crystal panel. 4. The circuit for generating an intermediate potential of the opposite polarity, wherein a gray level of a pixel corresponding to the second source line is intermediate between gray levels of two pixels corresponding to adjacent two adjacent source lines. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a circuit that calculates and generates an applied voltage that provides a gray scale of the following. 5. The liquid crystal display device according to claim 4, wherein a circuit for calculating and generating a potential of an intermediate gradation applied to said second source wiring is provided on a liquid crystal panel.