JPH06250147A - Liquid crystal display device, device and method for driving the same - Google Patents

Abstract

PURPOSE:To suppress the inversion in white and black occurring at the time viewing a display picture from a horizontal direction as much as possible by supplying any voltage among plural first driving voltages to a liquid crystal display device. CONSTITUTION:This device related to the driving of a digital LCD driver, generating (n) kinds of a first to an (n)-th driving voltages (V1 to Vn) corresponding to (n) kinds of gradations (M1 to Wn) and supplying them to the digital LCD driver is provided with (n) kinds of a first to an (n)-th voltage supply parts (SV1 to SVn). Further, by the first voltage supply part (SV1) generating the first driving voltage (Vl) corresponding to the lowest gradation (Wl), plural first driving voltages (V1) incorporating a regular driving voltage (V10) at the time of driving regurally and an especial driving voltage (V11) being a lower voltage than the regular driving voltage (V10) and a higher voltage than the second driving voltage (V2) are generated. Then, any voltage among plural first driving voltages (V1) is supplied to the liquid crystal display device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, a driving method thereof and a driving device thereof, and more specifically, LC
The present invention relates to a liquid crystal display device having improved viewing angle characteristics of a D (Liquid Crystal Display), a driving device thereof, and a driving method thereof.

[0002]

2. Description of the Related Art A driving device for a liquid crystal display device according to a conventional example will be described below with reference to FIG. A driving device for a liquid crystal display device according to a conventional example has a constant voltage (VT-V
S) is converted into alternating current, and digital LCD is used as drive voltage
As shown in FIG. 27, the device outputs to a driver, and includes an AC conversion unit (1), an amplification unit (2), and a voltage supply unit (3).

The AC converter (1) has resistors (R8, R).
9), inverter (IB), first and second switches (S
W1 and SW2) and converts a constant voltage (VT-VS) into an AC voltage. The amplification section (2) includes an operational amplifier (hereinafter referred to as an operational amplifier) (A0), a resistor (R1).
01, R102, R103), the AC voltage obtained by the AC conversion unit (1) is converted into a digital LCD.
It amplifies to the drive voltage level of the driver.

The voltage supply unit (3) includes operational amplifiers (A1 to A1).
A8) and resistors (R1 to R7), and an amplifier (2)
The AC voltage amplified by is resistance-divided by resistors (R1 to R7), and first to eighth drive voltages (V1 to V8) corresponding to eight kinds of display luminance gradations are supplied to a digital LCD driver (not shown). To supply. In the operation of the device, first, a constant voltage (VT-VS), which is a difference between an applied voltage (VT) given in advance and a reference voltage (VS), is converted into an AC voltage by the AC converter (1). .

That is, the first and second switches (SW
The same clock (CK) is input to (1, SW2). Since the inverter (IV) is connected to the input side of the second switch (SW2), the two switches in the opposite logic. Therefore, when the clock (CK) is at a high level (hereinafter referred to as “H”), the first switch (SW1) is turned on and the second switch (SW) is turned on.
Since 2) is turned off, the constant voltage (VT-VS) is dropped by the resistor (R8) and output to the amplification unit (2), and the clock (CK) is at a low level (hereinafter referred to as "L"). "", The first switch (SW
Since 1) is OFF and the second switch (SW2) is ON, a voltage lower than the voltage when the clock (CK) is “H” is output to the amplification unit (2). Since a voltage having a height difference is supplied every time the clock (CK) is switched, an AC voltage synchronized with the clock (CK) can be obtained.

Next, the AC voltage obtained as described above is amplified by the amplification section (2). That is, the AC voltage input from the AC converter (1) is the resistance (R10
It is input to one input side of the operational amplifier (A0) via 1). The other input side has a reference voltage (V
S) is connected, and the AC voltage is amplified by the operational amplifier (A0). The amplification factor at that time is the resistance (R10
It depends on 2).

Next, the amplified AC voltage is divided by the voltage supply unit (3), and the first to eighth drive voltages (V
1 to V8) are supplied to an LCD driver (not shown). That is, the AC voltage amplified by the amplifier (2) is
The resistance is divided by the resistors (R1 to R7) and output to the operational amplifiers (A1 to A8). These operational amplifiers (A
1 to A8) stabilize each voltage, and the first to eighth drive voltages (V1 to V8) for driving the LCD driver.
Is output to an LCD driver (not shown).

By the driving device of the liquid crystal display device as described above, driving voltages corresponding to eight kinds of gradations are generated and supplied to the LCD driver.

[0009]

However, according to the above-mentioned conventional driving device for a liquid crystal display device, the following problems occur. FIG. 28 is a graph showing the relationship between the drive voltage applied to the LCD driver and the light transmittance of the LCD panel corresponding to the drive voltage. Note that in FIG. 28, V1 to V8 indicate first to eighth drive voltages corresponding to eight types of display gradations (1 gradation to 8 gradations), and w1 to w8 indicate the display screen. The transmittances when viewed from the front are shown and correspond to V1 to V8, respectively. or,
Y1 and Y2 represent transmittances when the display screen is viewed from an angle of 45 ° to the right, and correspond to V1 and V2, respectively.

Generally, as shown in FIG. 28, when the driving voltage is increased, the transmittance when the display screen is viewed from the front is lowered, so that the display image on the LCD panel becomes darker (in the case of a monochrome panel). Is the black color of the displayed image).
However, when viewed from an angle of 45 ° to the right in the horizontal direction, the transmittance () under the first drive voltage (V1) [7.5 V] corresponding to one gradation, which is the lowest gradation, Y1),
Comparing with the transmittance (Y2) under the second drive voltage (V2) corresponding to the second gradation, which is the next lower gradation, the transmittance at Y1 is about 9%. , Y2 has a transmittance of about 3%, the transmittance of Y1 exceeds the transmittance of Y2, and the difference exceeds 5%.

Since such a difference can be confirmed with the naked eye, there is a reversal phenomenon that one gradation, which should originally be darker than two gradations when viewed from the front, looks brighter than two gradations. Occurs. That is, in an image in which there is a black crow in the background of dusk, a crow that should originally be black becomes white when viewed from the side, and the light and dark are reversed like the negative film of the photograph. (Hereinafter, this is called black-and-white reversal).

This black-and-white reversal does not occur in the preferential viewing angle direction described below, but occurs when the viewing angle is swung up, down, left and right around this preferential viewing angle direction as described above. This priority viewing angle direction will be briefly described. Generally, TN (Tw
The liquid crystal display device in the isted Nematic mode has a preferential viewing angle direction. The preferential viewing angle direction is shown in FIG.
As shown in FIG. 9, the direction is determined by the Ravigg's direction on the substrate side and the counter substrate side when aligning the liquid crystal molecules, and the display from that direction sees the ideal transmitted light for the liquid crystal display device. It will be.

Considering the reason for the black-and-white inversion described above, the applied voltage is sufficiently large [V] as shown in FIG.
In the case a), since the long axis direction of the liquid crystal molecules is aligned with the normal direction of the liquid crystal layer (LP) surface, the linearly polarized light component of the light incident from the lower surface of the liquid crystal layer (LP) is along the liquid crystal molecules. , Goes out in the direction normal to the surface of the liquid crystal layer. When viewed from the front (in the normal direction), only a linearly polarized light component generated by causing birefringence by the liquid crystal layer (LP) appears, which is a polarizing plate (PP) provided above the liquid crystal layer (LP). As a result, the light is shielded, so that no light appears and the image looks black as a black and white image.

However, in this case, when viewed obliquely (direction of an angle inclined by θ ° from the normal line direction of the liquid crystal layer surface in the figure), this direction forms an angle θ ° with the optical path of the linearly polarized light. Therefore, an elliptically polarized light component appears in this direction. On the other hand, the polarizing plate (PP) provided above the liquid crystal layer blocks linearly polarized light but transmits elliptically polarized light. In general, the elliptically polarized light component due to the birefringence of light increases as the angle formed with the optical path of linearly polarized light increases. Therefore, when the angle θ ° increases, the light passes through the polarizing plate (PP) and appears to be originally black. Becomes white. It is speculated that this is the cause of black and white reversal.

Further, FIG. 30 shows a conventional applied voltage (7.5).
7 is a graph showing a relationship between a viewing angle range corresponding to V) and a range with a contrast ratio of 10: 1 or more. Here, the viewing angle range is a range in which the contrast ratio is good (10: 1 or more is used as the mean), and black-and-white inversion does not occur and the display image is good. As shown in the figure,
Comparing the conventional viewing angle range corresponding to the applied voltage (7.5 V) and the range of the contrast ratio of 10: 1, the viewing angle range is narrower than the range of the contrast ratio of 10: 1 or more. This is because the viewing angle in the left-right direction is narrowed due to black-and-white inversion when the screen is viewed from the left-right direction (angle direction of 20 ° or more in the left-right direction).

Therefore, when a liquid crystal display device having the drive device is used for a display used for a television, an office automation equipment or the like, or an on-vehicle display used for a navigation system of a passenger car, the display screen is viewed from the side. When it is necessary, there is a problem in image display in that the display image is inverted in black and white, whereby the viewing angle range cannot be sufficiently secured and the viewing angle characteristic is deteriorated.

[0017]

The present invention has been made in view of the above-mentioned problems of the prior art. In a digital LCD driver, a first drive voltage (V1) corresponding to the lowest gradation (w1) is supplied. At this time, the special drive voltage (V1) which is lower than the normal drive voltage (V10) for the normal drive
A second analog drive voltage that is lower than the first analog drive voltage (VA1) in normal driving in the analog LCD driver by supplying a plurality of first drive voltages (V1) including 1). By supplying (VA2), it is possible to improve the viewing angle characteristics by suppressing the black and white reversal that tends to occur when the liquid crystal display is viewed from the side and expanding the viewing angle range as compared with the conventional one. The present invention provides a liquid crystal display device, a driving device and a driving method thereof.

[0018]

[Operation] According to the first driving device of the liquid crystal display device of the present invention, as shown in FIG. 1, n type first to nth voltage supply units (SV1 to SVn) are provided, and The first voltage supply unit (SV1) includes a plurality of first drive voltages including a normal drive voltage (V10) for normal drive and a special drive voltage (V11) lower than the normal drive voltage (V10). Drive voltage (V1) is supplied.

For example, the first voltage supply section (SV1) is provided with a switching selection means (SE1) and an adjustment means (CH1), and the switching selection means (SE1) minimizes a plurality of first drive voltages (V1). It is switched in multiple stages within a range corresponding to the gradation (w1) and any one of them is selected, or the plurality of first drive voltages (V1) are set to the lowest gradation (by the adjusting means (CH1). The normal drive voltage (V10) and the special drive voltage (V11) are generated by being changed evenly within the range corresponding to w1) and selecting one of them.

Therefore, within the range corresponding to the lowest gradation (w1), the normal drive voltage (V10) and the special drive voltage (V1)
1) Among a plurality of first drive voltages (V1) including and,
It becomes possible to select an appropriate drive voltage according to the usage situation. According to the first driving method of the liquid crystal display device of the present invention, when the first driving voltage (V1) corresponding to the lowest gradation (w1) is supplied in steps P1 and P2 of FIG. A normal drive voltage (V10) for normal drive and the normal drive voltage (V10) depending on the usage status of the device.
Any of the plurality of first drive voltages (V1) including the special drive voltage (V11) that is a lower voltage than that is supplied.

Therefore, by supplying the special drive voltage (V11), it is possible to suppress black and white reversal that occurs when the display screen is viewed from the lateral direction as much as possible. The reason will be described later in detail with reference to FIG. Furthermore, according to the first liquid crystal display device of the present invention, as shown in FIG.
, The image display unit (D1) and the drive control unit (D
2) and the drive control unit (D2) is equipped with the drive device of the liquid crystal display device according to the present invention, and the first drive voltage (V
1) is switched in multiple stages, and the normal drive voltage (V10)
And a switching selection means (SE1) for selecting any one of the plurality of first drive voltages (V1) including the special drive voltage (V11).

For this reason, the normal drive voltage (V10) and the special drive voltage (V11) are supplied, so that the normal display is used for the purpose of seeing from the front alone (hereinafter, this state is referred to as the front mode). ) Can supply a normal drive voltage (V10) with a good front contrast ratio, and when it is necessary to view from the lateral direction for viewing by a large number of people (hereinafter, this state is referred to as lateral mode). By supplying the special drive voltage (V11), it becomes possible to suppress black-and-white inversion when viewed from the lateral direction.

Therefore, for example, the first drive voltage (V1) is switched in two steps, one of which is the normal drive voltage (V10).
By setting the other to the special drive voltage (V11), it is possible to support both the front mode and the lateral mode. Further, according to the second liquid crystal display device of the present invention, as shown in FIG. 4, the image display unit (D3) and the drive control unit (D4) are provided, and the drive control unit (D4) includes the present invention. The driving device of the first liquid crystal display device according to the first aspect is mounted, and the first driving device is provided within the range corresponding to the lowest gradation (w1).
Of the normal drive voltage (V10) and the plurality of first drive voltages (V1) including the special drive voltage (V11) by varying the drive voltage (V1) of the first drive voltage (V1) evenly. ) Is provided outside.

Therefore, as in the first liquid crystal display device according to the present invention, the normal drive voltage (V10) and the special drive voltage (V11) are generated, so that the normal drive voltage ( V10) and a special drive voltage (V11) in the lateral mode,
It is possible to prevent black and white reversal when viewed from the horizontal direction.

Further, since it becomes possible to change the first drive voltage (V1) over the entire range within the range corresponding to the lowest gradation (w1), the first liquid crystal display device according to the present invention can be realized. In comparison, fine adjustment of the first drive voltage (V1) becomes possible. Therefore, fine adjustments can be made according to the usage status. Further, according to the second driving device for the liquid crystal display device of the present invention, as shown in FIG. 5, an AC converting means (AK1), an amplifying means (AK2), and an adjusting means (AK).
3) and are provided.

For example, the AC signal converting means (AK1) converts the analog signal voltage (AS) into an AC voltage (VK), and the amplifying means (AK2) amplifies the AC voltage (VK) to a drive level of the liquid crystal display device. The analog drive voltage (VA) is generated, and the amplification rate of the AC voltage (VK) by the amplification means (22) is uniformly changed by the adjustment means (23).

Therefore, the normally supplied first analog drive voltage (VA1) and the first analog drive voltage (V1)
A second analog drive voltage (V) which is lower than A1)
It becomes possible to generate a plurality of analog drive voltages (VA) including A2). Further, according to the third driving device for the liquid crystal display device of the present invention, as shown in FIG. 6, a first analog drive voltage generating means (AK4) and a second analog drive voltage generating means (AK5). And selection means (AK6)
It has and.

For example, based on the analog signal voltage (AS), the first analog drive voltage (VA) for the normal drive by the first analog drive voltage generating means (AK4).
1) is generated, and second analog drive voltage generation means (A
The second analog drive voltage (VA2), which is lower than the first analog drive voltage (VA1), is generated by K5), and the second analog drive voltage (VA2) is generated by the selection means (AK6). Any one of the second analog drive voltage generating means (AK5) is selected.

Therefore, the first analog drive voltage (VA
It is possible to select either 1) or the second analog drive voltage (VA2) according to the usage situation. Further, according to the second driving method of the liquid crystal display device according to the present invention, the analog signal voltage (A
A first analog drive voltage (VA1) for normal drive based on S) and the first analog drive voltage (VA1)
Second analog drive voltage (VA2) that is lower than
A plurality of analog drive voltages (VA) including

Therefore, the first analog drive voltage (VA
The second analog drive voltage (VA) which is lower than 1).
By generating 2), it is possible to suppress black and white reversal that occurs when viewing the display screen from the lateral direction as much as possible. The reason will be described later with reference to FIG. Further, according to the third liquid crystal display device of the present invention, as shown in FIG. 8, the drive control unit (D6) includes an image display unit (D5) and a drive control unit (D6). A second driving device for a liquid crystal display device according to the invention is mounted, and the analog driving voltage (VA) is varied uniformly to obtain a first analog driving voltage (VA1).
An adjusting means (AK6) for selecting any one of a plurality of analog drive voltages (VA) including a second analog drive voltage (VA2) lower than the first analog drive voltage (VA1) is external. It is provided in.

Therefore, as in the second liquid crystal display device according to the present invention, the first analog drive voltage (VA1) and the second analog drive voltage (VA2) are supplied to the front mode. Can supply the first analog drive voltage (VA1) having a good front contrast ratio, and in the lateral mode, by supplying the second analog drive voltage (VA2), image display can be performed from the lateral direction. It is possible to prevent black and white inversion when viewing the section (D5).

Further, within a certain range, it becomes possible to change the second analog drive voltage (VA2) over the entire range, so that the analog drive voltage of the second liquid crystal display device according to the present invention can be changed. Fine adjustment is possible. Therefore, fine adjustments can be made according to the usage status. Furthermore, according to the fourth liquid crystal display device of the present invention, as shown in FIG.
, The image display unit (D7) and the drive control unit (D
8), and the drive control unit (D8) is equipped with the drive device for the third liquid crystal display device according to the present invention, and the analog drive voltage (VA) is switched in multiple steps to produce the first analog signal. Any one of a plurality of analog drive voltages (VA) including a drive voltage (VA1) and a second analog drive voltage (VA2) which is lower than the first analog drive voltage (VA1) is selected. The selection means (AK6) is provided outside.

Therefore, similar to the first liquid crystal display device according to the present invention, the first analog drive voltage (VA1) and the second analog drive voltage (VA2) are supplied to the front mode. Can supply the first analog drive voltage (VA1) having a good front contrast ratio, and can supply the second analog drive voltage (VA2) in the lateral direction mode so that it can be seen from the lateral direction. It is possible to suppress black and white reversal at the time.

For example, the analog drive voltage (VA) is switched in two steps, and one of them is switched to the first analog drive voltage (VA).
In 1), the other is the second analog drive voltage (VA2)
It is possible to correspond to both the front mode and the lateral mode by setting each of the above. The reason why the black-and-white inversion does not occur by lowering the drive voltage will be described below with reference to FIG.

Conventionally, a sufficiently large applied voltage [Va:
For example, 7.5 V] was applied as the first drive voltage (V1), so that the liquid crystal molecules had stood up. However, when an applied voltage [Vb] lower than a sufficiently large applied voltage [Va] is applied, as shown in FIG. 10, the liquid crystal molecules do not stand and the long axis direction of the liquid crystal molecules is normal to the surface of the liquid crystal layer. Since it forms an angle δ ° with the direction, the linearly polarized light component of the light incident from the lower surface of the liquid crystal layer goes out along the liquid crystal molecules in a direction forming an angle δ ° with the normal direction of the surface of the liquid crystal layer.

Then, as compared with the case of the applied voltage [Va] in which the normal direction of the liquid crystal layer surface and the optical path of the linearly polarized light coincided with each other, the optical path of the linearly polarized light component and when viewed obliquely appeared. The angle θ '° with the optical path of the elliptically polarized light component is
The elliptically polarized light component is smaller than that of Eq.
Therefore, the elliptically polarized component is less likely to pass through the polarizing plate (PP) as compared with the case where the applied voltage [Va] is applied, and the black one when viewed from the front looks black when viewed from the oblique direction. Therefore, it is possible to suppress black and white reversal.

For the above reasons, the normal drive voltage (V10) for the normal drive and the first analog drive voltage (VA
Special drive voltage (V11) which is lower than 1) and the second
It can be seen that by applying the analog drive voltage (VA2), the black-and-white inversion that occurs when viewing the display screen from the lateral direction can be suppressed as much as possible.

[0038]

Embodiments of the liquid crystal display device, the driving device and the driving method thereof according to the present invention will be described below in detail with reference to FIGS. 11 to 26. Further, the present liquid crystal display device is particularly effective in normally white with a white screen and TN mode (twist angle of liquid crystal molecules is 90 °) when a drive voltage is not applied and the switching element is off.

(1) First Embodiment Hereinafter, a driving device of a liquid crystal display device according to a first embodiment of the present invention will be described first. The driving device has first to eighth driving modes in which the AC voltage (VK) input to the driving device corresponds to eight kinds of gradations from the lowest gradation of 1 gradation to the highest gradation of 8 gradations. This is a device that divides the voltage (V1 to V8) and outputs it to a digital LCD driver (not shown).

As shown in FIG. 11, the structure of the driving device is a variable resistor (hereinafter referred to as volume) (VR1).
1), the first to sixth resistors (R12 to R17) and the first
-It consists of the 8th operational amplifier (A11-A18). Volume (VR11) and first to sixth resistors (R12 to R)
17) is the basis of the drive voltage, and the potential difference [VK-VS] between the AC voltage (VK) input to the device and the reference voltage (VS) is divided into the first to the eighth by resistance division. The voltage is divided into drive voltages (V1 to V8).

The first to eighth operational amplifiers (A11 to A1)
8) is the generated first to eighth drive voltages (V1 to V).
This is for stabilizing the output of 8). In the operation of the driving device, when an AC voltage (VK) is applied from the outside, the potential difference between the AC voltage (VK) and the reference voltage (VS) is the volume (VR11) and the first to sixth portions. Divided by the resistance ratio of the resistors (R12 to R17) to generate first to eighth drive voltages (V1 to V8), and
The first to eighth drive voltages (V1 to V8) generated by the eighth operational amplifier (A11 to A18) are stabilized,
It is output to a digital LCD driver (not shown).

In each of the divided voltages, the eighth drive voltage (V8) is about 1.8V, the seventh drive voltage (V7) is about 2.7V, and the sixth drive voltage (V6) is about. 3.2V, 5th drive voltage (V5) is about 3.3V, 4th drive voltage (V4) is about 3.5V, 3rd drive voltage (V3) is about 3.7V, 2nd drive The voltage (V2) is about 4.3V, the first
Drive voltage (V1) is about 4.6 to 7.5V.

At this time, the resistor relating to the generation of the first drive voltage (V1) corresponding to one gradation which is the lowest gradation is the volume (VR11), and the resistance value is variable, so that the first The driving voltage (V1) is variable within the range of about 4.6 to 7.5V. As described above, according to the driving device of the liquid crystal display device of the first embodiment of the present invention, for the first driving voltage (V1), the resistance value of the volume (VR11) is changed, It becomes possible to select an appropriate drive voltage in accordance with the use situation within a range (about 4.6 to 7.5 V) corresponding to one gradation.

The liquid crystal display device according to the first embodiment of the present invention will be described below with reference to FIG. As shown in FIG. 12, the liquid crystal display device according to the first embodiment of the present invention includes an LCD display (101), a driving device (102) and an adjusting volume (103).

The LCD display (101) displays an image on itself based on the first to eighth drive voltages (V1 to V8) and has a built-in digital LCD driver. The driving device (102) is a device equipped with the driving device of the liquid crystal display device according to the first embodiment of the present invention, and inputs AC voltage (VK) into itself to drive the first to eighth driving voltages. (V1 to V8) on the LCD display (10
It is output to 1).

The adjusting volume (103) is a variable resistor and corresponds to the volume (VR11) of the driving device of the liquid crystal display device according to the first embodiment of the present invention, and the first driving voltage (V1). Within a range corresponding to one gradation (4.6 to 7.5).
V). The operation of the liquid crystal display device will be described below. First, when an AC voltage (VK) is input to the driving device (102), the driving device (10
The first to eighth drive voltages (V1 to V8) are output from 2) to the LCD display (101).

At this time, since the first drive voltage (V1) is variable by the adjusting volume (103), 1
The feature of the device is that it can be changed within the range corresponding to the gradation (4.6 to 7.5 V). It should be noted that, as shown below, the viewing angle characteristics are improved by lowering the first drive voltage (V1) as compared with the conventional one. FIG.
FIG. 4 is a graph showing the relationship between the voltage applied to the LCD driver and the light transmittance of the LCD panel corresponding to the voltage. In addition, in FIG. 13, V2 to V8 are 2
Applied voltages corresponding to gradations to 8 gradations are shown, and V11 to V15 indicate a plurality of first drive voltages corresponding to 1 gradation.

Further, w2 to w8 indicate transmittances when the display screen is viewed from the front and correspond to V2 to V8, respectively, and w11 to w15 are transmittances when the display screen is viewed from the front. Respectively, and correspond to V11 to V15, and Y11 to Y15 indicate the transmittance when the display screen is viewed from an angle of 45 ° to the right, and correspond to V11 to V15, respectively.

As shown in FIG. 13, the range of the first drive voltage corresponding to one gradation is about 4.6 to 7.5V.
Here, for example, in the range of 4.6 to 7.5 V, the first driving voltage is 5.1, which is lower than the conventional 7.5 V.
When V is applied (V15 in the figure), the corresponding transmittance (Y15) is about 4.2%, which is about 4.3% of the transmittance (Y2) corresponding to two gradations. In comparison, about 0.
Only about 1% difference.

With such a difference, it is almost impossible to discern with the naked eye, so that black and white reversal does not occur when viewed from the angle direction of 45 ° to the left and right. Similarly, when the drive voltages (V11 to V15) in the figure are examined, V11 to V11
In the range up to V13, it may be assumed that black-and-white inversion hardly occurs when viewed from the angle direction of 45 ° to the left and right. The reason for this is that, as described with reference to FIG. 10, by supplying a voltage lower than 7.5 V (for example, 5.1 V of V15 in FIG. 13) at which the liquid crystal molecules almost stand up, the liquid crystal molecules stand sufficiently. It is considered that this is because it is possible to suppress the cause of black-and-white inversion that the elliptically polarized light component in the horizontal direction becomes large. In this way, by applying the first drive voltage (hereinafter referred to as the black-and-white inversion suppression voltage) which is lower than the voltage applied conventionally,
It can be seen that it is possible to suppress black and white reversal.

As described above, according to the liquid crystal display device of the first embodiment of the present invention, as shown in FIG.
LCD display (101) and driving device (102)
The driving device (102) is equipped with the driving device for the liquid crystal display device according to the first embodiment of the present invention, and the first driving voltage (V1) is uniformly changed within a range corresponding to one gradation. The normal drive voltage (V10) and the special drive voltage (V1
The adjustment volume (14A) for selecting any one of the plurality of first drive voltages (V1) including 1) is provided outside.

Therefore, a plurality of first drive voltages (V11
To V15), the normal LC
When the D display is used for the purpose of viewing from the front alone (hereinafter referred to as front mode), the first drive voltage (V
7.5V with a good contrast ratio in the front direction as 1)
In addition, when the display needs to be viewed from the lateral direction (hereinafter, referred to as lateral mode), such as when a large number of people look at one LCD display, black-and-white inversion is performed as the first drive voltage (V1). Since 5.3V, which is one of the inhibition voltages, can be supplied, depending on the case where the application is viewed from the front or when the application is required to be viewed from the side, It will be possible to deal with.

Further, the range corresponding to one gradation (4.6 to
Within 7.5 V, the first drive voltage (V
Since it is possible to change 1), it is possible to make fine adjustments. In terms of viewing angle characteristics, the optimum first drive voltage (V1) that suppresses black-and-white inversion and also secures the contrast ratio is about 5.3V,
Below, experimental results for confirming the effect when particularly 5.3 V is selected as the first drive voltage for suppressing black-and-white inversion will be described with reference to FIGS. 14 to 16.

First, the improvement of the contrast ratio will be described. FIG. 14 is a graph showing the relationship between the viewing angle and the contrast ratio. As shown in FIG. 14, when a conventional applied voltage (7.5 V) is applied, the front direction (left 20
When viewed from the range of 20 ° to 20 ° to the right), the contrast ratio is higher than that in the case where the applied voltage (5.3 V) in each embodiment of the present invention is applied, but in the lateral direction (left 20).
When viewed from a range of more than 20 ° and more than 20 ° to the right), the contrast ratio corresponding to the applied voltage (5.3 V) in each embodiment of the present invention exceeds that of the conventional applied voltage (7.5 V). However, when seen from the lateral direction, the applied voltage (5.3 V) in each example of the present invention is better.

Secondly, the improvement of the viewing angle range will be described. FIG. 15 is a view angle range corresponding to the conventional applied voltage (7.5 V) and the applied voltage (5.3) according to each embodiment of the present invention.
5 is a graph showing a relationship with a viewing angle range corresponding to V). FIG. 16 is a graph showing the relationship between the viewing angle range corresponding to the applied voltage (5.3 V) and the range of the contrast ratio of 10: 1 or more according to each example of the present invention.

As shown in FIG. 15, the viewing angle range corresponding to the applied voltage (5.3 V) according to each embodiment of the present invention is larger than the viewing angle range corresponding to the conventional applied voltage (7.5 V). It is getting wider. Further, as shown in FIG. 16, the viewing angle range corresponding to the applied voltage (5.3 V) according to each embodiment of the present invention is the applied voltage (5.3 V) according to each embodiment of the present invention.
Is almost the same as the contrast ratio range of 10: 1 or more. This is the voltage (7.5
By applying an applied voltage (5.3 V) lower than that of V), the black-and-white reversal that occurs when viewing the screen from the left-right direction (angle direction of 20 ° or more in the left-right direction) is suppressed. It is due to.

As described above, by applying the applied voltage (5.3 V) which is lower than the voltage (7.5 V) that has been conventionally applied, the points such as the contrast ratio and the viewing angle range are reduced. It was confirmed that the viewing angle characteristics were improved compared to the conventional one. In addition, in the drive device according to the present embodiment, the volume (VR11), the first to sixth resistors (R12 to R).
17) and first to eighth operational amplifiers (A11 to A18)
Is an example of the first to nth voltage supply units (SV1 to SVn), and the volume (VR11) is the adjusting means (CH1).
Is an example.

In the liquid crystal display device according to this embodiment, the LCD display (101) has an image display unit (D).
1) and the drive device (102) is an example of a drive control section (D2). Furthermore, the adjustment volume (10
3) is an example of the adjusting means (CH1). In addition, in the drive device of the present embodiment, the first to eighth drive voltages (V1
~ V8) to generate volume (VR11) and first
~ The sixth resistor (R12 to R17) is used for resistance division, but it is also possible to use a capacitor in place of the resistor for capacity division.

(2) Second Embodiment A second embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. Note that items common to the first embodiment will be omitted because they overlap. Hereinafter, a driving device of a liquid crystal display device according to a second embodiment of the present invention will be described first. The device has first to eighth drive voltages corresponding to eight kinds of gradations, which are AC gradations (VK) input to itself, from the lowest gradation of 1 gradation to the highest gradation of 8 gradations. This is a device for dividing into (V1 to V8) and outputting to the digital LCD driver.

As shown in FIG. 17, the structure of the apparatus is as follows.
Changeover switch (SW20), first to third resistors (R
210-R212), 4th-10th resistors (R22-
R28) and the first to eighth operational amplifiers (A21 to A2)
It consists of 8). The changeover switch (SW20), the first to third resistors (R210 to R212), and the fourth to tenth resistors (R22 to R28) are the basis of the drive voltage, and the AC voltage input to the device. (VK) and the reference voltage (V
The potential difference [VK-VS] between S) and S) is divided into first to eighth drive voltages (V1 to V8) by resistance division.

In particular, the changeover switch (SW20), the first
~ The third resistor (R210 to R212) is related to the supply of the first drive voltage (V1), and is connected to the changeover switch (SW2).
0) to the first to third resistors (R210 to R21).
Any one of 2) is selected, and the first to eighth drive voltages (V1 to V8) are determined according to the resistance value of the selected resistor.

The first to eighth operational amplifiers (A21 to
A28) is the generated first to eighth drive voltages (V1 to V1).
This is for stabilizing the output of V8). The operation of the device is such that when an AC voltage (VK) is applied from the outside,
The potential difference between the AC voltage (VK) and the reference voltage (VS) is equal to any one of the first to third resistors (R210 to R212) selected by the changeover switch (SW20) and the fourth voltage. ~ Divided by the resistance ratio of the tenth resistor (R22 ~ R28), the first to eighth drive voltage (V1 ~.
V8) is generated and the first to eighth operational amplifiers (A11 to A11) are generated.
A18) the first to eighth drive voltages (V
1 to V8) are stabilized and output to a digital LCD driver (not shown).

In each of the divided voltages, the eighth drive voltage (V8) is about 1.8V, the seventh drive voltage (V7) is about 2.7V, and the sixth drive voltage (V6) is about 3.2V, 5th drive voltage (V5) is about 3.3V, 4th drive voltage (V4) is about 3.5V, 3rd drive voltage (V3) is about 3.7V, 2nd drive The voltage (V2) is about 4.3V, the first
Drive voltage (V1) is about 5.3V, 6.4V, 7.5V
It is any one of At this time, the first drive voltage (V
When 1) about 5.3V and 6.4V are selected, the second to eighth drive voltages (V2 to V8) are 0.3 and 0.3V, respectively.
It will be reduced by about 0.5V.

At this time, the resistors relating to the generation of the first drive voltage (V1) corresponding to one gradation which is the lowest gradation are
It is one of the third resistors (R210 to R212), and there is room for selection of three types of resistance values. That is, 7.5V is output when R210 is selected, and 6.4V is output when R211 is selected,
5.3V is output when R212 is selected.

As described above, according to the driving device of the liquid crystal display device of the second embodiment of the present invention, the first driving voltage (V1) is in the range corresponding to one gradation (about 4). Within a range of 0.6 to 7.5 V, an appropriate driving voltage (5.3 V,
Any one of 6.4 V and 7.5 V) can be selected according to the usage situation. A liquid crystal display device according to the second embodiment of the present invention will be described below with reference to FIG.

The liquid crystal display device according to the second embodiment of the present invention, as shown in FIG.
1), drive device (112) and adjusting volume (113)
Consists of. The LCD display (111) is the first to the eighth
It displays an image on itself based on the drive voltage (V1 to V8) of the above, and has a built-in digital LCD driver.

The driving device (112) is a device equipped with the driving device of the liquid crystal display device according to the second embodiment of the present invention, and inputs an alternating voltage (VK) to itself to drive the first to eighth driving devices. Drive voltage (V1 to V8) of LCD display (11
It is output to 1). Mode switch (11
3) corresponds to the changeover switch (SW20) of the driving device of the liquid crystal display device according to the second embodiment of the present invention, and corresponds to 5.3.
Of the three types of voltages of V, 6.4V, and 7.5V, an appropriate first drive voltage (V1) is selected according to the usage situation. In addition, the mode selector switch (11
The numbers attached to 3) correspond to the first drive voltage (V1), where "1" is 7.5V and "2" is 6.4V.
"3" corresponds to 5.3V, respectively.

As described in the first embodiment, the first
When 5.3V is selected as the driving voltage (V1) of (1), black-and-white inversion when viewing the LCD display (111) from the lateral direction can be suppressed, and the viewing angle characteristics can be improved. Therefore, as in the first embodiment, in the front mode, for example, the mode selector switch (113)
Is switched to "1" to supply 7.5V having a favorable front contrast ratio as the first drive voltage (V1), and the mode selector switch (113) is set to "3" in the lateral mode.
It is possible to change the first drive voltage (V1) according to the usage situation, such as switching to the above and selecting 5.3V, which is one of the black and white inversion suppression voltages, as the first drive voltage (V1). .

As a result, the LCD display (11
When the main purpose is to see 1) from the front,
Depending on the application required to be viewed from the side,
It becomes possible to support both. Further, since the voltage corresponding to the usage condition is selected by the mode switch (113), when the first drive voltage (V1) is changed by the adjusting volume (103) as in the first embodiment. In comparison, the handling by the user becomes easier.

In the drive unit according to this embodiment, the first to third resistors (R210 to R212) and the fourth resistor are used.
The tenth resistors (R22 to R28) and the first to eighth operational amplifiers (A21 to A28) are examples of the first to nth voltage generation units (SV1 to SVn), and the changeover switch (SW20) is , Switch selection means (SE1). In the liquid crystal display device according to the present embodiment, LC
The D display (111) is an example of the image display unit (D3), and the drive device (112) is an example of the drive control unit (D4). Further, the mode changeover switch (113) is an example of a changeover selection unit (SE1).

Further, in the drive device of this embodiment,
The first to third resistors (R210 to R212) and the fourth to first resistors are used to generate the first to eighth drive voltages (V1 to V8).
The resistors (R22 to R28) of 0 are used for resistance division, but it is also possible to use capacitors instead of resistors for capacitance division. (3) Third Embodiment Hereinafter, a third embodiment of the present invention will be described with reference to FIGS.
Will be described with reference to. Note that items common to the first and second embodiments will be omitted because they overlap.

Hereinafter, first, a driving device of a liquid crystal display device according to a third embodiment of the present invention will be described. The device converts a constant voltage (VK) into an AC voltage, and first to eighth driving corresponding to eight kinds of gradations from the lowest gradation of 1 gradation to the highest gradation of 8 gradations. This is a device that divides the voltage (V1 to V8) and outputs it to a digital LCD driver (not shown).

As shown in FIG. 19, the structure of the driving device comprises an AC conversion section (31), an amplification section (32) and a voltage supply section (33). The AC converter (31) includes a second volume (VR32), a resistor (R38, R39), an inverter (IB31), a first switch and a second switch (SW31, SW31).
SW32) and converts a constant voltage (VK-VS) into an AC voltage.

The amplifier section (32) has an operational amplifier (A3
0) and resistors (R301, R302, R303), and the AC voltage obtained by the AC converter (31) is
It amplifies to the drive voltage level of the LCD driver. The voltage supply unit (33) includes first to eighth operational amplifiers (A31 to A38), a first volume (VR31) and resistors (R31 to R37), and supplies the AC voltage amplified by the amplification unit (32). , Resistors (R1 to R7) are used for resistance division, and the first to the first corresponding to eight types of display brightness gradation
The eighth drive voltage (V1 to V8) is supplied to an LCD driver (not shown).

In the operation of the device, a constant voltage (VK-VS) given in advance is converted into an AC voltage by the AC converter (31). That is, the same clock (C) is applied to the first and second switches (SW31, SW32).
K) has been entered. Since the inverter (IB31) is connected to the input side of the second switch (SW32), the two switches in the opposite logic.

Therefore, when the clock (CK) is at a high level (hereinafter referred to as "H"), the first switch (SW31) is turned on and the second switch (SW) is turned on.
32) is turned off, so constant voltage (VK-VS)
Voltage drop by the amount due to the resistor (R38)
2) and when the clock (CK) is at a low level (hereinafter referred to as “L”), the first switch (SW31) is off and the second switch (S).
Since W32) is turned on, a voltage lower than the voltage when the clock (CK) is "H" is output to the amplification section (32).

Therefore, a voltage having a height difference is supplied every time the clock (CK) is switched, so that an AC voltage synchronized with the clock (CK) can be obtained. At this time, the amplitude of the output AC voltage can be changed by the second volume (VR32). Next, the AC voltage obtained as described above is amplified by the amplification section (32).

That is, the AC voltage input from the AC converter (31) is input to one input side of the operational amplifier (A30) via the resistor (R301). The reference voltage (VS) for driving the liquid crystal is connected to the other input side,
The AC voltage is amplified by the operational amplifier (A30). The amplification factor at that time depends on the resistance (R302). Next, the amplified AC voltage is divided by the voltage supply unit (33), and the first to eighth drive voltages (V1 to V8) are supplied to the LCD driver (not shown).

That is, the AC voltage amplified by the amplification section (32) is resistance-divided by the first volume (VR31) and the resistors (R31 to R37), and the first to eighth
Is output to the operational amplifier (A31 to A38). These first to eighth operational amplifiers (A31 to A38) stabilize respective voltages, and digital LCD drivers (not shown) as first to eighth driving voltages (V1 to V8) for driving the digital LCD driver. Is output to.

In each of the divided voltages, the eighth drive voltage (V8) is about 1.8 V, the seventh drive voltage (V7) is about 2.7 V, and the sixth drive voltage (V6) is about 3.2V, 5th drive voltage (V5) is about 3.3V, 4th drive voltage (V4) is about 3.5V, 3rd drive voltage (V3) is about 3.7V, 2nd drive The voltage (V2) is about 4.3V, the first
Drive voltage (V1) is about 4.6 to 7.5V.

At this time, the resistor relating to the generation of the first drive voltage (V1) corresponding to one gradation which is the lowest gradation is the first volume (VR31), and the resistance value is variable. The first driving voltage (V1) is variable within the range of about 4.6 to 7.5V. As described above, according to the driving device of the liquid crystal display device of the third embodiment of the present invention,
It becomes possible to select an appropriate first drive voltage (V1) in accordance with the use condition within a range (about 4.6 to 7.5 V) corresponding to one gradation.

A liquid crystal display device according to the third embodiment of the present invention will be described below with reference to FIG. As shown in FIG. 12, the liquid crystal display device according to the third embodiment of the present invention comprises an LCD display (101), a driving device (102) and an adjusting volume (103).

The LCD display (101) displays an image on itself based on the first to eighth drive voltages (V1 to V8) and has a built-in LCD driver.
The driving device (102) is a device equipped with the driving device of the liquid crystal display device according to the third embodiment of the present invention, and after converting the constant voltage into the AC voltage, the first to eighth driving voltages ( V
1-V8) to generate an LCD display (101)
Is output to.

The adjusting volume (103) is a variable resistor and corresponds to the first volume (VR31) in the driving device of the liquid crystal display device according to the third embodiment of the present invention.
Drive voltage (V1) within the range corresponding to one gradation (4.6
.About.7.5 V). The operation of the liquid crystal display device will be described below. First, when a constant voltage is input to the driving device (102), the driving device (102)
Outputs the first to eighth drive voltages (V1 to V8) to the LCD display (101).

At this time, the first drive voltage (V1) is made variable by the adjusting volume (103), so that the first drive voltage (V1) can be changed within the range corresponding to one gradation (4.6 to 7.5 V). Is the feature of the device. As described above, according to the liquid crystal display device according to the third embodiment of the present invention, as shown in FIG. 12, the driving device (102) and the adjusting volume (103) are provided, and the driving device (102) is provided. In addition, the driving device for the liquid crystal display device according to the third embodiment of the present invention is mounted, and the first drive voltage (V1) is adjusted by the adjusting volume (103) within a range corresponding to one gradation (4.6 to 7). .5
V) is selected.

Therefore, in the front mode, 7.5 V, which has a good front contrast ratio, is selected, and in the lateral mode, the voltage is lower than 7.5 V, which is one of the black and white inversion inhibiting voltages. It becomes possible to select the first drive voltage (V1) according to the usage situation, such as selecting .3V. The first drive voltage (V1) is 5.3V.
The reason why the black-and-white reversal when viewed from the side can be suppressed and the viewing angle characteristic is improved when is selected is already described in the first embodiment, and will not be described.

Further, since it becomes possible to change the first drive voltage (V1) over the entire range within the range corresponding to one gradation, as compared with the first liquid crystal display device according to the present invention. , Fine adjustment is possible. Therefore, fine adjustments can be made according to the usage status. In addition, in the drive device according to the present embodiment, the volume (VR31), the first to sixth
Resistors (R32 to R37) and first to eighth operational amplifiers (A31 to A38) are connected to the first to nth voltage supply units (SV).
1 to SVn), and a volume (VR11)
Is an example of the adjusting means (CH1).

In the liquid crystal display device according to this embodiment, the LCD display (101) has an image display section (D).
3) and the drive device (102) is an example of a drive control unit (D4). Furthermore, the adjustment volume (10
3) is an example of the adjusting means (CH1). Furthermore, in the drive device of the present embodiment, the first to eighth drive voltages (V
1-V8) to generate the first volume (VR31)
Although the resistance division is performed using the and and resistors (R31 to R37), it is also possible to perform the capacitance division by using a capacitor instead of the resistor.

(4) Fourth Embodiment A fourth embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to. Note that items common to the first, second, and third embodiments will be omitted because they overlap. Hereinafter, a driving device of a liquid crystal display device according to a fourth embodiment of the present invention will be described first. The device converts a constant voltage (VK) into an AC voltage, and first to eighth driving corresponding to eight kinds of gradations from the lowest gradation of 1 gradation to the highest gradation of 8 gradations. This is a device that divides the voltage (V1 to V8) and outputs it to a digital LCD driver (not shown).

A driving device for a liquid crystal display device according to the fourth embodiment of the present invention is a device for converting a constant voltage (VK) into an alternating current and outputting it as a driving voltage to a digital LCD driver, and an alternating current converting portion ( 41), an amplification unit (42) and a voltage supply unit (43). The AC converter (41) includes a second volume (VR40), resistors (R401, R402),
Inverter (IB41), first and second switches (SW
41, SW42) and converts a constant voltage (VK-VS) into an AC voltage.

The amplifier section (42) includes an operational amplifier (A4
0) and resistors (R403, R404, R405), the AC voltage obtained by the AC converter (41) is
The amplification is performed up to the drive voltage level of the digital LCD driver. The voltage supply unit (43) includes a changeover switch (SW40), resistors (R411 to R413), resistors (R).
42 to R48) and first to eighth operational amplifiers (A41 to R48).
A48), the AC voltage amplified by the amplification section (42) is resistance-divided by resistors (R1 to R7),
The first to eighth drive voltages (V1 to V8) corresponding to eight kinds of display luminance gradations are supplied to a digital LCD driver (not shown).

Changeover switch (SW40), first to third
The resistors (R411 to R413) and the fourth to tenth resistors (R42 to R48) are the basis of the driving voltage, and the AC voltage (VK) input to the device and the reference voltage (V).
The potential difference [VK-VS] between S) and S) is divided into first to eighth drive voltages (V1 to V8) by resistance division.

Particularly, the changeover switch (SW40), the first
~ The third resistor (R210 to R212) is related to the supply of the first drive voltage (V1), and is connected to the changeover switch (SW2).
0) to the first to third resistors (R411 to R41).
Any one of 3) is selected, and the first to eighth drive voltages (V1 to V8) are determined by the resistance value of the selected resistor.

The first to eighth operational amplifiers (A21 to
A28) is the generated first to eighth drive voltages (V1 to V1).
This is for stabilizing the output of V8). The operation of the device is as follows. First, a constant voltage (VK-V
S) is converted into an AC voltage by the AC converter (41). That is, the first and second switches (SW41, S
The same clock (CK) is input to W42). Since the inverter (IB41) is connected to the input side of the second switch (SW42), the two switches by the opposite logic.

Therefore, when the clock (CK) is "H", the first switch (SW41) is turned on and the second switch (SW42) is turned off, so that the constant voltage (VK-VS) is reached. ) Is reduced in voltage by an amount corresponding to the resistance (R401) and is output to the amplification unit (42). When the clock (CK) is “L”, the first switch (SW41) is turned off, and the second switch Switch (S
Since W42) is turned on, a voltage lower than the voltage when the clock (CK) is "H" is output to the amplification section (42).

Therefore, a voltage having a height difference is supplied every time the clock (CK) is switched, so that an alternating voltage synchronized with the clock (CK) can be obtained. At this time, the amplitude of the output AC voltage can be changed by the volume (VR40). Next, the AC voltage obtained as described above is amplified by the amplification section (42).

That is, the AC voltage input from the AC converter (41) is input to one input side of the operational amplifier (A40) via the resistor (R403). The reference voltage (VS) for driving the liquid crystal is connected to the other input side,
The AC voltage is amplified by the operational amplifier (A40). The amplification factor at that time depends on the resistance (R404). Next, the amplified AC voltage is divided by the voltage supply unit (43), and the first to eighth drive voltages (V1 to V8) are supplied to the LCD driver (not shown).

That is, the AC voltage amplified by the amplifier (42) is the first to third resistors (R411 to R413) selected by the changeover switch (SW20).
And one of the fourth to tenth resistors (R42 to R4).
8) The voltage is divided by the resistance ratio of 8) and each voltage is stabilized by the first to eighth operational amplifiers (A41 to A48).
Drive voltage (V1 to V8) of digital L not shown
It is output to the CD driver.

In each of the divided voltages, the eighth drive voltage (V8) is about 1.8 V, the seventh drive voltage (V7) is about 2.7 V, and the sixth drive voltage (V6) is about 3.2V, 5th drive voltage (V5) is about 3.3V, 4th drive voltage (V4) is about 3.5V, 3rd drive voltage (V3) is about 3.7V, 2nd drive The voltage (V2) is about 4.3V, the first
Drive voltage (V1) is about 5.3V, 6.4V, 7.5V
It is any one of At this time, the first drive voltage (V
When 1) about 5.3V and 6.4V are selected, the second to eighth drive voltages (V2 to V8) are 0.3 and 0.3V, respectively.
It will be reduced by about 0.5V.

At this time, the resistors relating to the generation of the first drive voltage (V1) corresponding to one gradation which is the lowest gradation are
It is one of the third resistors (R210 to R212), and there is room for selection of three types of resistance values. As described above, according to the driving device of the liquid crystal display device of the fourth embodiment of the present invention, the first driving voltage (V1) is in the range corresponding to one gradation (about 4.6 to 7.5V)
Within the appropriate drive voltage (5.3V, 6.4V, 7.5
It becomes possible to select any one of V) according to the use situation.

A liquid crystal display device according to the fourth embodiment of the present invention will be described below with reference to FIG. As shown in FIG. 18, the liquid crystal display device according to the fourth embodiment of the present invention includes an LCD display (111), a driving device (112) and a mode changeover switch (113).

The LCD display (111) displays an image on itself based on the first to eighth drive voltages (V1 to V8) and has a built-in LCD driver.
The driving device (112) is a device equipped with the driving device of the liquid crystal display device according to the fourth embodiment of the present invention, and inputs AC voltage (VK) into itself to drive the first to eighth driving voltages. (V
1 to V8) are output to the LCD display (111).

The mode changeover switch (113) corresponds to the changeover switch (SW20) of the driving device of the liquid crystal display device according to the second embodiment of the present invention, and is 5.3V, 6.4V,
An appropriate first drive voltage (V1) is selected from among three types of voltages of 7.5 V according to the usage situation. The number attached to the mode changeover switch (113) in the figure corresponds to the first drive voltage (V1),
"1" corresponds to 7.5V, "2" corresponds to 6.4V, and "3" corresponds to 5.3V.

The operation of the liquid crystal display device will be described below. First, when a constant voltage is input to the driving device (102), the driving device (112) outputs first to eighth driving voltages (V1 to V8) to the LCD display (101). At this time, the mode changeover switch (113) is used to select an appropriate first drive voltage (V
It is a characteristic of the liquid crystal display device according to the present embodiment that 1) can be selected.

As described in the first embodiment, the first
When 5.3V is selected as the driving voltage (V1) of 1, the black-and-white inversion when viewing the LCD display (111) from the lateral direction can be suppressed, and the viewing angle characteristic is improved. Therefore, as in the first embodiment, in the front mode, for example, the mode changeover switch (113) is switched to "1" and the first drive voltage (V1) is set to 7.5 V, which has a favorable front contrast ratio. In the horizontal mode, the mode selector switch (113) is switched to "2" or "3" to select 5.3V or 6.4V which is the white / black inversion suppression voltage as the first drive voltage (V1). As described above, the first drive voltage (V1) can be changed according to the usage situation.

As a result, the LCD display (11
When the main purpose is to see 1) from the front,
Depending on the application required to be viewed from the side,
It becomes possible to support both. Further, the mode selector switch (113) selects the voltage corresponding to the use condition, so that the adjustment volume (10) is adjusted as in the first embodiment.
Compared with the case where the first drive voltage (V1) is changed in 3), the user can easily handle it.

In the drive unit according to this embodiment, the first to third resistors (R410 to R412) and the fourth resistor are used.
The tenth resistors (R42 to R48) and the first to eighth operational amplifiers (A41 to A48) are examples of the first to nth voltage generation units (SV1 to SVn), and the changeover switch (SW40) is , Switch selection means (SE1). In the liquid crystal display device according to the present embodiment, LC
The D display (111) is an example of an image display unit (D1), and the drive device (112) is an example of a drive control unit (D2). Further, the mode changeover switch (113) is an example of a changeover selection unit (SE1).

Further, in the driving device of this embodiment, the first to eighth driving voltages (V1 to V8) are generated.
-Third resistors (R410 to R412), fourth to tenth
The resistors (R42 to R48) are used for resistance division, but it is also possible to use capacitors instead of resistors for capacity division. (5) Fifth Embodiment Hereinafter, the fifth embodiment of the present invention will be described with reference to FIGS.
Will be described with reference to. It should be noted that items common to the first to fourth examples will be omitted because they overlap.

First, a driving device for a liquid crystal display device according to the fifth embodiment of the present invention will be described below. The device converts an analog signal input to itself into an AC voltage for driving the LCD driver, generates a driving voltage (VA) for driving the LCD driver corresponding to analog, and outputs L (not shown).
The data is output to the CD driver. As shown in FIG. 21, the driving device of the liquid crystal display device according to the fifth embodiment of the present invention includes an AC conversion unit (51) and an amplification unit (52).

The AC converter (51) includes a first volume (VR51), an operational amplifier (A51), first and second switches (SW51, SW52) and an inverter (IB5).
0), which converts an input analog signal (AS) into an AC voltage (VK). Amplification unit (52)
Is composed of an operational amplifier (A52) and includes an AC conversion unit (5
The AC voltage (VK) obtained in 1) is amplified to a level equivalent to LCD driver drive, and the analog compatible L
The drive voltage (VA) for driving the CD driver is generated.

The amplification factor adjusting section (53) is provided with a volume (VR
52) and changes the amplification factor of the amplification section (52). In the operation of the device, first, an analog signal (AS) is input to the AC conversion unit (51) and converted into an AC voltage (VK). That is, the same clock (CK) is applied to the first and second switches (SW51, SW52).
Has been entered. Since the inverter (IB50) is connected to the input side of the second switch (SW52),
Both of them switch in the opposite logic.

Therefore, when the clock (CK) is "H", the first switch (SW51) is ON and the second switch (SW52) is OFF, so that the analog signal (AS) is generated. Without being amplified by the operational amplifier (A51), it is directly output to the amplifier (52),
When the clock (CK) is “L”, the first switch (SW51) is off and the second switch (SW52) is on, so that the operational amplifier (A
51), the clock (C
The voltage higher than the voltage when K) is “H” is higher than
It is output to 2).

Therefore, each time the clock (CK) is switched, a voltage having a height difference is supplied, so that an AC voltage synchronized with the clock (CK) can be obtained. Its amplitude depends on the resistance (R51). Next, the amplification section (52)
As a result, the AC voltage (VK) is amplified to a level equivalent to driving the LCD driver, and a driving voltage (VA) for driving the analog LCD driver is generated.

At this time, the AC voltage obtained by the AC converter (51) is amplified by the operational amplifier (A52) to generate the drive voltage (VA) for driving the LCD driver. The amplification factor is variable, depending on the amplification factor adjusting unit (53), that is, the volume (VR51). That is, it is possible to change the amplification factor of the amplification section (52) by changing the resistance value of the volume (VR52).

FIG. 22 is a supplementary explanatory view for explaining the operation of the drive system. By changing the resistance value of the volume (VR52), the slope of the straight line showing the relationship between the analog signal voltage (AS) and the analog drive voltage (VA) shown in FIG. 22 changes. Therefore, for example, when the amplification factor is reduced, as shown by the dotted line graph in FIG. 22, the same analog signal voltage (AS) is generated as compared with the first analog drive voltage (VA1) generated during normal driving. A low second analog drive voltage (VA2) is generated.

As described above, according to the driving device of the liquid crystal display device of the fifth embodiment of the present invention, the AC conversion section (51), the amplification section (52) and the amplification factor adjustment section (53) are provided. It has. For example, the AC conversion unit (51) converts the analog signal voltage (AS) into an AC voltage (VK), and the amplification unit (52) amplifies the AC voltage (VK) to a drive level of the liquid crystal display device to generate an analog drive voltage. (VA) is generated, and the amplification factor adjusting unit (53) uniformly changes the amplification factor of the AC voltage (VK) by the amplification unit (52).

Therefore, the normally supplied first analog drive voltage (VA1) and the first analog drive voltage (V1)
A second analog drive voltage (V) which is lower than A1)
It becomes possible to generate a plurality of analog drive voltages (VA) including A2). Therefore, for the same reason as in the first to fourth embodiments, by generating the second analog drive voltage (VA2) that is lower than the first analog drive voltage (VA1), the horizontal direction is generated. It is possible to suppress black and white reversal that occurs when looking at the display screen.

A liquid crystal display device according to the fifth embodiment of the present invention will be described below with reference to FIG. As shown in FIG. 23, the liquid crystal display device according to the fifth embodiment of the present invention includes an LCD display (121) and a driving device (1).
22) and the adjusting volume (123).

The LCD display (121) displays an image on itself based on the analog drive voltage (VA), and has an analog LCD driver built therein. The driving device (122) is a device equipped with the driving device of the liquid crystal display device according to the fifth embodiment of the present invention, and inputs the analog signal voltage (AS) to itself and outputs the analog driving voltage (VA). The data is output to the LCD display (121).

The adjusting volume (123) is a variable resistor, corresponds to the volume (VR52) of the driving device of the liquid crystal display device according to the first embodiment of the present invention, and changes the analog drive voltage (VA). It is what makes me. The operation of the liquid crystal display device will be described below. First, when the analog signal voltage (AS) is input to the driving device (122),
LCD display (121) from drive unit (122)
An analog drive voltage (VA) is output to.

At this time, since the analog drive voltage (VA) can be made variable by the adjusting volume (123), it is lower than the first analog drive voltage (VA1) generated during normal driving. It is a feature of the device that it is possible to generate the second analog drive voltage (VA1). As described above, according to the liquid crystal display device of the fifth embodiment of the present invention, as shown in FIG. 12, the LCD display (121), the driving device (122) and the adjusting volume (123) are provided. The driving device (122) is equipped with the driving device of the liquid crystal display device according to the fifth embodiment of the present invention, and has an analog driving voltage (V
A) is uniformly changed by the adjusting volume (123).

Therefore, the first analog drive voltage (VA
1) and a second analog drive voltage (VA2) that is a lower voltage than that are supplied, so that in the front mode, the first analog drive voltage (VA1) having a good front contrast ratio is supplied. The second analog drive voltage (VA2) in the lateral mode.
For the same reason as in the first embodiment, it is possible to suppress black and white reversal when the image display section (41) is viewed from the lateral direction.

Further, the second analog drive voltage (VA
Since 2) can be uniformly changed, fine adjustment can be performed as in the second liquid crystal display device according to the present invention.
Therefore, fine adjustments can be made according to the usage status. In the drive device according to the present embodiment, the AC converter (51) is an example of the AC converter (AK1), and the amplifier (52) is an example of the amplifier (AK2). The amplification factor adjusting unit (53) is an example of adjusting means (AK3).

(6) Sixth Embodiment Hereinafter, a sixth embodiment of the present invention will be described with reference to FIGS.
Will be described with reference to. It should be noted that the common points with the first to fifth embodiments will be omitted because they overlap. Hereinafter, a driving device of a liquid crystal display device according to a sixth embodiment of the present invention will be described first. The device converts an analog signal voltage (AS) input to itself into an AC voltage (VK) for driving the analog LCD driver, and drives the analog LCD driver by driving voltage (V).
A) is generated and output to an analog LCD driver (not shown).

The structure of the device comprises an inversion suppression voltage supply section (67), a normal voltage supply section (68) and a drive voltage selection section (69). The inversion suppression voltage supply unit (67) lowers the amplification factor when the driving voltage applied to the analog LCD driver (not shown) is high to be lower than the amplification factor when the driving voltage is low, thereby performing the first analog driving. Voltage (VA1)
Second analog drive voltage (VA2) that is lower than
And a first AC converter (6
7A) and the first amplification section (67B).

The first AC converter (67A) includes a first inverter (IB61) and switches (SW61, SW6).
2), the first amplifier (61) and the first voltage detector (6)
2) and the analog signal voltage (A
While detecting S) as needed, an AC voltage for driving the analog LCD driver is generated based on the clock (CK) and the analog signal voltage (AS).

The first amplification section (67B) comprises a second amplifier (63) and a second voltage detector (64), and the AC voltage generated by the first AC conversion section (67A). Is amplified to the level of the LCD driver drive. The normal voltage supply unit (68) is an analog L (not shown).
A first AC drive voltage (VA1), which is a drive voltage of a normal level, is generated and supplied with a constant amplification factor of the drive voltage applied to the CD driver. ) And a second amplifier (68B).

The second AC converter (68A) includes a second inverter (IB62) and switches (SW63, SW6).
4) and a third amplifier (65), which generate an AC voltage (VK) for driving an analog LCD driver based on a clock (CK) input to itself and an analog signal voltage (AS). Is. Second amplifier (68
B) is composed of a fourth amplifier (66) and amplifies the AC voltage generated by the second AC converter (68A) to a level for driving an analog LCD driver.

The drive voltage selection section (69) selects either the inversion suppression voltage supply section (67) or the normal voltage supply section (68) in accordance with the use condition, and the analog signal voltage ( AS) and a clock (CK) related to AC voltage conversion of the analog signal voltage (AS) are output to either the inversion suppression voltage supply unit (67) or the normal voltage supply unit (68).

The operation of the device will be described separately when the inversion suppression voltage supply section (67) and the normal voltage supply section (68) are selected. Hereinafter, first, the case where the normal voltage supply unit (68) is selected will be described. First, the switch of the drive voltage selection unit (69) is switched to the normal voltage supply unit (68) side, and the analog signal voltage (AS)
And a clock (CK) related to AC voltage conversion of the analog signal voltage (AS) are input to the normal voltage supply unit (68).

Next, the analog signal voltage (AS) is converted into an AC voltage (VK) by the second AC conversion section (68A) of the normal voltage supply section (68). At this time, the analog signal voltage (AS) output from the drive voltage selection unit (69) is input to both the third amplifier (65) and the third switch (SW63).

Furthermore, the third and fourth switches (SW6
3, the same clock (CK) is input to SW64. The second side is provided on the input side of the fourth switch (SW64).
Inverter (IB62) is connected, so that the two switches with logics opposite to each other. Therefore, when the clock (CK) is "H", the third switch (SW6)
3) is turned on and the fourth switch (SW64) is turned off, so that the voltage amplified by the third amplifier (65) and having a higher level than the analog signal voltage (AS) is the second amplification. Is output to the section (68B), and when the clock (CK) is "L", the third switch (S
W63) is off, and the fourth switch (SW6)
4) is turned on, so analog signal voltage (AS)
Is output at the same level. Therefore, a voltage lower than the voltage when the clock (CK) is “H” is output to the second amplification section (68B). Therefore, a voltage having a height difference is supplied every time the clock (CK) is switched, so that an AC voltage synchronized with the clock (CK) is obtained.

Next, the AC voltage generated by the second AC converter (68A) is amplified to the LCD driver drive level by the second amplifier (68B), that is, the fourth amplifier (66), and is normally driven. Is output as a first analog drive voltage (VA1) to an LCD driver (not shown). As described above, the drive voltage is generated when the normal voltage supply unit (68) is selected.

Secondly, the inversion suppression voltage supply section (6
The case where 7) is selected will be described. First, the switch of the drive voltage selection section (69) is operated by the inversion suppression voltage supply section (6
Switching to the 7) side, the inversion suppression voltage supply section (67) is selected. At this time, the analog signal voltage (AS) and the clock (CK) related to the AC voltage conversion of the analog signal voltage (AS) are input to the inversion suppression voltage supply unit (67).

Next, the analog signal voltage (AS) is converted into the first AC conversion section (67A) of the inversion suppression voltage supply section (67).
Is converted into an AC voltage (VK) by the same operation as the second AC converter (68A). At this time, at the same time, the first voltage detector (62) detects the analog signal voltage (AS) at any time, and the amplification factor of the first amplifier (61) is changed at any time accordingly.

That is, when the voltage of the analog signal voltage (AS) becomes high, the first drive control signal (DS1) is output from the first voltage detector (62) to the first amplifier (61), and in response thereto. The generated drive voltage is substantially the same as the amplification factor at the time of generating the drive voltage generated by the normal voltage supply unit (68) at the correlation as shown in the graph of FIG. The voltage of the first amplifier (6) is satisfied while satisfying the correlation such that the amplification factor is lower than the drive voltage generated by the normal voltage supply unit (68).
It is changed by 1).

Next, the AC voltage generated by the first AC converter (67A) is amplified to the analog LCD driver drive level by the first amplifier (67B), that is, the second amplifier (63), and the second Analog drive voltage (V
A) is output to an LCD driver (not shown). At this time, the AC voltage generated by the first AC converter (67A) is the second amplifier (63) and the second voltage detector (64).
Entered in and.

The second voltage detector (64) detects the AC voltage generated by the first AC converter (67A), and the amplification factor of the second amplifier (63) is changed at any time based on the detected AC voltage. It That is, the analog signal voltage (A
When the voltage of S) becomes high, the second drive control signal (DS) is sent from the second voltage detector (64) to the second amplifier (63).
2) is output, and the drive voltage generated accordingly is
The correlation shown in the graph of FIG. 25, that is, the amplification factor at the time of generating the drive voltage generated by the normal voltage supply unit (68) at the low voltage is almost the same, and at the high voltage, the normal voltage supply unit (68). 2) while satisfying the correlation such that the amplification factor is lower than the drive voltage generated by
Of the amplifier (63).

As described above, the drive voltage is generated when the inversion suppression voltage supply section (67) is selected. As described above, according to the driving device for the liquid crystal display device of the sixth embodiment of the present invention, the normal drive voltage supply unit (68), the inversion suppression voltage supply unit (67), and the drive voltage selection unit. (69) is provided.

For example, the first analog drive voltage (VA1) for the normal drive is generated by the normal drive voltage supply section (68) based on the analog signal voltage (AS),
A second analog drive voltage (VA2) that is lower than the first analog drive voltage (VA1) is generated by the inversion suppression voltage supply unit (67), and the drive voltage selection unit (69).
According to this, either the normal drive voltage supply unit (68) or the inversion suppression voltage supply unit (67) is selected.

Therefore, the normally supplied first analog drive voltage (VA1) and the first analog drive voltage (V1)
A second analog drive voltage (V) which is lower than A1)
Either A2) or A2) can be selected according to the usage situation. Therefore, for the same reason as in the fifth embodiment of the present invention, the second analog drive voltage (VA2), which is lower than the first analog drive voltage (VA1), is generated, so that the second analog drive voltage (VA2) is generated from the lateral direction. It is possible to suppress the black and white reversal that occurs when viewing the display screen as much as possible, and improve the viewing angle characteristics.

A liquid crystal display device according to the sixth embodiment of the present invention will be described below with reference to FIG. As shown in FIG. 26, the liquid crystal display device according to the sixth embodiment of the present invention includes an LCD display (131), a driving device (132) and a mode changeover switch (133).

The LCD display (131) displays an image on itself based on the analog drive voltage (VA) and has a built-in LCD driver. The driving device (132) is a device equipped with the driving device of the liquid crystal display device according to the sixth embodiment of the present invention, and inputs the analog signal voltage (AS) to itself to drive the analog driving voltage (VA).
Is output to the LCD display (131).

The mode changeover switch (133) corresponds to the drive voltage selection section (69) of the drive unit of the liquid crystal display device according to the sixth embodiment of the present invention, and the inversion inhibition voltage supply section (67) of the drive unit. ) And the normal voltage supply unit (68) are selected according to the usage situation. In the operation of the liquid crystal display device, first, when an analog signal voltage (AS) is input to the driving device (132), the driving device (132) outputs the analog driving voltage (VA) to the LCD display (131). .

At this time, the analog drive voltage (VA) is the first analog drive voltage (VA1) generated during normal driving by the mode changeover switch (133) and a voltage lower than the first analog drive voltage (VA1). 2 analog drive voltage (V
It is a feature of the liquid crystal display device that A1) can be selected according to the use situation. As described above, according to the sixth liquid crystal display device of the present invention, the LCD device (131), the driving device (132) and the mode changeover switch (133) are provided, and the driving device (132) is provided.
The driving device for the liquid crystal display device according to the present embodiment is mounted, and the analog driving voltage (VA) is switched in multiple steps to achieve the first
Of the analog drive voltage (VA1) and the second analog drive voltage (VA2) which is lower than the first analog drive voltage (VA1) are externally provided with a mode changeover switch (133). It is provided.

Therefore, as in the fifth liquid crystal display device according to the present invention, the first analog drive voltage (VA1) and the second analog drive voltage (VA1) which is lower than the first analog drive voltage (VA1).
2) and the analog drive voltage (V
A) is switched to two stages, one is a first analog drive voltage (VA1) having a good front-side contrast ratio, and the other is a second analog drive voltage (VA) capable of suppressing black and white inversion.
By setting to 2), respectively, it becomes possible to support both the front mode and the lateral mode.

Further, since the voltage corresponding to the usage condition is selected by the mode changeover switch (133), the user can easily handle the voltage as compared with the case of adjusting with the volume as in the fifth embodiment. In the drive device according to the present embodiment, the inversion suppression voltage supply unit (67) is an example of the second analog drive voltage generation means (AK5), and the normal drive voltage supply unit (68) is the first analog drive voltage. Voltage generation means (A
K4) is an example. The drive voltage selection section (69) is an example of selection means (AK6).

Further, in the liquid crystal display device according to the present embodiment, the LCD display (131) has an image display section (D).
5) and the drive device (132) is an example of a drive control section (D6). Furthermore, the mode changeover switch (133) is an example of a selection means (AK6).

[0149]

As described above, the first aspect of the present invention
According to the driving device of the liquid crystal display device, the n-type first to nth voltage supply units (SV1 to SVn) are provided, and the first voltage supply unit (SV1) is the normal drive voltage (V10). )
And a plurality of first drive voltages (V1) including the special drive voltage (V11).

Therefore, it becomes possible to select an appropriate first drive voltage (V1) according to the usage situation. Also,
According to the first driving method of the liquid crystal display device of the present invention,
Normal drive voltage (V10) depending on the usage status of the device
And a plurality of first drive voltages (V1) including the special drive voltage (V11).

Therefore, it is possible to suppress black and white reversal that occurs when viewing the display screen from the lateral direction as much as possible. Further, according to the first liquid crystal display device of the present invention, the liquid crystal display device according to the present invention includes an image display unit (D1) and a drive control unit (D2), and the drive control unit (D2) drives the liquid crystal display device of the present invention. The device is mounted and the switching selection means (SE1) is provided outside.

Therefore, in the front mode, the normal drive voltage (V10) having a good front contrast ratio is supplied, and in the horizontal mode, the special drive voltage (V1) for suppressing the black and white inversion.
By supplying 1), the optimal 1st
It becomes possible to supply the drive voltage (V1) of. According to the second liquid crystal display device of the present invention, the liquid crystal display device according to the present invention includes an image display unit (D3) and a drive control unit (D4), and the drive control unit (D4) drives the liquid crystal display device of the present invention. The device is mounted and the adjusting means (CH1) is provided outside.

Therefore, as in the first liquid crystal display device according to the present invention, the normal drive voltage (V1
0) can be supplied, and by supplying a special drive voltage (V11) in the lateral direction mode, it becomes possible to suppress black and white reversal when viewed from the lateral direction.
Furthermore, in comparison with the first liquid crystal display device according to the present invention,
Since the drive voltage (V1) can be finely adjusted, fine adjustment can be performed according to the usage situation.

Further, according to the second driving apparatus for the liquid crystal display device of the present invention, it is provided with the AC converting means (AK1), the amplifying means (AK2) and the adjusting means (AK3). Therefore, a plurality of analog drive voltages including the normally supplied first analog drive voltage (VA1) and the second analog drive voltage (VA2) lower than the first analog drive voltage (VA1). It becomes possible to generate (VA).

Further, according to the third driving device for the liquid crystal display device of the present invention, the first analog driving voltage generating means (AK4) and the second analog driving voltage generating means (AK).
5) and a selection means (AK6). Therefore, the normally supplied first analog drive voltage (VA1)
And the second analog drive voltage (VA2), which is lower than the first analog drive voltage (VA1), can be selected according to the use situation.

Furthermore, the second embodiment of the liquid crystal display device according to the present invention.
According to the driving method of (1), a plurality of analog drive voltages (VA) including a first analog drive voltage (VA1) and a second analog drive voltage (VA2) are generated based on the analog signal voltage (AS). There is. Therefore, by generating the second analog drive voltage (VA2), it becomes possible to suppress black and white inversion that occurs when the display screen is viewed from the lateral direction.

Further, according to the third liquid crystal display device of the present invention, it is provided with the image display section (D5) and the drive control section (D6), and the drive control section (D6) has the third aspect of the present invention. The driving device for the liquid crystal display device of No. 2 is mounted, and adjusting means (AK
3) is provided outside. Therefore, similar to the second liquid crystal display device according to the present invention, the first analog drive voltage (VA1) and the second analog drive voltage (VA2) are supplied, so that in the front mode, The second analog drive voltage (V1) that supplies the first analog drive voltage (VA1) and suppresses white / black inversion in the horizontal mode.
A2) can be supplied.

Further, as with the second liquid crystal display device according to the present invention, since fine adjustment is possible, fine adjustment can be made according to the usage situation. Further, according to the fourth liquid crystal display device of the present invention, the image display unit (D7) and the drive control unit (D8) are provided, and the drive control unit (42) has the third liquid crystal display of the present invention. A drive device for a display device is mounted, the analog drive voltage (VA) is switched in multiple stages, and a plurality of analog drive voltages including a first analog drive voltage (VA1) and a second analog drive voltage (VA2). Selection means (AK6) for selecting any one of (VA)
Is provided outside.

Therefore, similar to the first liquid crystal display device according to the present invention, the first analog drive voltage (VA1) is supplied in the front mode and the second analog drive voltage (VA1) is supplied in the lateral mode.
By supplying the analog drive voltage (VA2) of the above, it becomes possible to support both the front mode and the lateral mode.

[Brief description of drawings]

FIG. 1 is a principle diagram of a first driving device of a liquid crystal display device according to the present invention.

FIG. 2 is a flowchart illustrating a first driving method of the liquid crystal display device according to the present invention.

FIG. 3 is a principle diagram of a first liquid crystal display device according to the present invention.

FIG. 4 is a principle diagram of a second liquid crystal display device according to the present invention.

FIG. 5 is a principle diagram of a driving device of a second liquid crystal display device according to the present invention.

FIG. 6 is a principle diagram of a driving device of a third liquid crystal display device according to the present invention.

FIG. 7 is a flowchart illustrating a second driving method of the liquid crystal display device according to the present invention.

FIG. 8 is a principle view of a third liquid crystal display device according to the present invention.

FIG. 9 is a principle diagram of a fourth liquid crystal display device according to the present invention.

FIG. 10 is a diagram illustrating an operation of the driving method of the liquid crystal display device according to the present invention.

FIG. 11 is a configuration diagram of a driving device of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 12 is a configuration diagram of a liquid crystal display device according to first and third embodiments of the present invention.

FIG. 13 is a first supplementary explanatory diagram of the liquid crystal driving method according to the first embodiment of the present invention.

FIG. 14 is a second supplementary explanatory diagram of the liquid crystal driving method according to the first embodiment of the present invention.

FIG. 15 is a third supplementary explanatory diagram of the liquid crystal driving method according to the first embodiment of the present invention.

FIG. 16 is a fourth supplementary explanatory diagram of the liquid crystal driving method according to the first embodiment of the present invention.

FIG. 17 is a configuration diagram of a driving device of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 18 is a configuration diagram of a liquid crystal display device according to second and fourth embodiments of the present invention.

FIG. 19 is a configuration diagram of a driving device of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 20 is a configuration diagram of a driving device of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 21 is a configuration diagram of a driving device of a liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 22 is a supplementary explanatory diagram of the driving device of the liquid crystal display device according to the fifth embodiment of the present invention.

FIG. 23 is a configuration diagram of a liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 24 is a configuration diagram of a driving device of a liquid crystal display device according to a sixth embodiment of the present invention.

FIG. 25 is a supplementary explanatory diagram of a driving device of a liquid crystal display device according to a sixth embodiment of the present invention.

FIG. 26 is a configuration diagram of a liquid crystal display device according to a sixth embodiment of the present invention.

FIG. 27 is a configuration diagram of a drive device of a liquid crystal display device according to a conventional example.

FIG. 28 is a first explanatory diagram of a problem of the conventional example.

FIG. 29 is a second explanatory diagram of the problem of the conventional example.

FIG. 30 is a third explanatory diagram of the problem of the conventional example.

Claims (12)

[Claims] 1. A method for driving a digital LCD driver, wherein n kinds of first to nth driving voltages (V1 to Vn) corresponding to n kinds of gradations (w1 to wn) are generated to generate the digital LCD driver. For generating a first drive voltage (V1) corresponding to the lowest gray level (w1) and including n types of first to nth voltage supply units (SV1 to SVn). The first voltage supply unit (SV1) is
The normal drive voltage (V10) for normal drive and a special drive voltage (V1) that is lower than the normal drive voltage (V10) and higher than the second drive voltage (V2).
A liquid crystal display device characterized by generating a plurality of first drive voltages (V1) including 1) and supplying any one of the plurality of first drive voltages (V1) to the liquid crystal display device. Drive. 2. The first voltage supply unit (SV1) switches a plurality of first driving voltages (V1) in multiple stages within a range corresponding to the lowest gradation (w1), A switching selection means (SE1) for selecting any one of a driving voltage (V10) and a plurality of first driving voltages (V1) including the special driving voltage (V11), and a plurality of selected first driving voltages (SE1). 2. The drive device for a liquid crystal display device according to claim 1, comprising a supply means (KY1) for supplying a drive voltage (V1) to the liquid crystal display device. 3. The first voltage supply unit (SV1) uniformly changes the plurality of first drive voltages (V1) within a range corresponding to the lowest gray level (w1), and the normal drive voltage (SV1). V1
0) and a plurality of first drive voltages including the special drive voltage (V11).
Adjusting means (CH1) for selecting any one of the driving voltages (V1) and a supplying means (KY2) for supplying the selected plurality of first driving voltages (V1) to the liquid crystal display device. The drive device for the liquid crystal display device according to claim 1. 4. A driving method for a digital LCD driver, wherein n kinds of first to nth driving voltages (V1 to Vn) corresponding to n kinds of gradations (w1 to wn) are generated to generate the digital LCD driver. A method of driving a liquid crystal display device for supplying a first driving voltage (V1) corresponding to the lowest gray level (w1) to a normal driving voltage (V1) for normal driving.
0) and a first drive voltage (V1) including a special drive voltage (V11) that is lower than the normal drive voltage (V10). Driving method of display device. 5. An image display section (D1) and a drive control section (D
2), wherein the drive control unit (D2) is equipped with the drive device of the liquid crystal display device according to any one of claims 1 and 2, and has the lowest gradation (w1).
The first drive voltage (V1) is switched in multiple stages within a range corresponding to the first drive voltage (V1) including the normal drive voltage (V10) and the special drive voltage (V11). The liquid crystal display device is characterized in that the switching selection means (SE1) for selecting any of the above is provided outside. 6. An image display section (D3) and a drive control section (D
4) is provided, the drive control unit (D4) is provided with the drive device of the liquid crystal display device according to claim 1 or 3, and the drive control unit (D4) includes the drive device in the range corresponding to the lowest gradation (w1). The first driving voltage (V1) is uniformly changed to a plurality of first driving voltages (V1) including the normal driving voltage (V10) and the special driving voltage (V11).
The liquid crystal display device, wherein the adjusting means (CH1) for selecting any one of the above is provided outside. 7. Based on the analog signal voltage (AS),
A device for generating an analog driving voltage (VA) for driving an analog LCD driver and supplying the analog driving voltage (VA) to the analog LCD driver, which is an AC conversion means (AK1) for converting an analog signal voltage (AS) into an AC voltage (VK). An amplifying unit (AK2) for amplifying the AC voltage (VK) to a drive level of the liquid crystal display device to generate an analog drive voltage (VA); and amplifying the AC voltage (VK) by the amplifying unit (22). A driving device for a liquid crystal display device, comprising an adjusting means (AK3) for changing the rate. 8. Based on the analog signal voltage (AS),
A device for generating an analog drive voltage (VA) for driving an analog LCD driver and supplying the analog drive voltage to the analog LCD driver, which is a first analog drive voltage for normal drive based on an analog signal voltage (AS). A first analog drive voltage generation means (AK4) for generating (VA1), and a second analog drive voltage lower than the first analog drive voltage (VA1) based on the analog signal voltage (AS) Second analog drive voltage generation means (AK5) for generating a voltage (VA2), the first analog drive voltage generation means (AK4), and second
2. A drive device for a liquid crystal display device, comprising: a selection unit (AK6) for selecting one of the analog drive voltage generation unit (AK5). 9. The second analog drive voltage generation means (AK5) detects the analog signal voltage (AS) at any time and outputs the drive control signal (D) to the AC voltage generation means (AK52).
Voltage detection means (AK51) for outputting D) and AC voltage generation means (AK52) for generating a second analog drive voltage (VA2) based on the drive signal (DD).
9. The drive device for a liquid crystal display device according to claim 8, comprising: 10. A method of generating an analog drive voltage (VA) for driving an analog LCD driver based on the analog signal voltage (AS) and supplying the analog drive voltage (VA) to the analog LCD driver, the analog signal voltage (AS) A plurality of analog drives including a first analog drive voltage (VA1) for normal drive based on the above and a second analog drive voltage (VA2) lower than the first analog drive voltage (VA1) A method for driving a liquid crystal display device, which comprises generating a voltage (VA). 11. An image display section (D5) and a drive control section (D
6) and the drive control section (D6) is equipped with the drive device of the liquid crystal display device according to claim 8 or 9, and the analog drive voltage (VA) is switched in multiple stages. , The first analog drive voltage (VA1),
Second voltage which is lower than the analog drive voltage (VA1) of
The liquid crystal display device, wherein the switching selection means (AK6) for selecting any one of a plurality of analog drive voltages (VA) including the analog drive voltage (VA2) is provided outside. 12. An image display section (D7) and a drive control section (D
8) is provided, and the drive device of the liquid crystal display device according to claim 7 is mounted on the drive control unit (D8), and the analog drive voltage (VA) is varied evenly to provide the first analog signal. The adjustment for selecting one of a plurality of analog drive voltages (VA) including a drive voltage (VA1) and a second analog drive voltage (VA2) which is lower than the first analog drive voltage (VA1) A liquid crystal display device characterized in that means (AK3) is provided outside.