JPH1010529A - Liquid crystal display device and information transfer device with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent white display color. SOLUTION: When chromaticity of a required white display of a liquid crystal display device 1 are defined x(FL), y(FL), the chromaticity of a turn-on color of a back light device 3 are x(BL), y(BL), the chromaticity of transmission light of a liquid crystal element 2 when the liquid crystal element 2 is lighted from a rear side by the back light device 3 with equal energy white light are x(LC), y(LC), when the emission characteristics of fluorescent tubes 14a, 14b, 14c, 14d of the back light device 3 are adjusted so as to be satisfied simultaneously with the relations: (x(FL)-x(LC)).(x(BL)-x(FL))>0 and (y(FL)-y(LC)).(y(BL)-y(FL))>0, the excellent white display color is obtained.

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 provided with a liquid crystal element and a backlight device for illuminating the liquid crystal element from the back side thereof, and an information transmission device provided with the liquid crystal display device.

[0002]

2. Description of the Related Art Conventionally, as a liquid crystal display device for displaying an arbitrary image, a system in which a liquid crystal element which is an optical shutter and a backlight device for illuminating the liquid crystal element from the back side are widely used. . In this liquid crystal display device, it is desirable that the lighting color of the liquid crystal display device is white when the liquid crystal layer of the liquid crystal element is in a transmissive state, from the viewpoint of the visibility of display and the visibility of color display.

Therefore, the spectral transmittance of the liquid crystal element constituting the liquid crystal display device and the lighting color of the backlight device are designed to be white. The transmitted light color of a liquid crystal element is determined by a liquid crystal material used, a substrate gap (the thickness of a liquid crystal layer), a transparent electrode, and the like.

For example, in the case of a liquid crystal element using a birefringence mode, the transmittance I of the liquid crystal layer with respect to the transmitted light wavelength is expressed as follows:
a (sin (πΔnd / λ) ² .

Here, a: proportional constant, Δn: birefringence of liquid crystal material, d: thickness of liquid crystal layer, λ: wavelength of transmitted light.

FIG. 11 shows an example of the wavelength dependence of the transmittance of the liquid crystal element. The transmittance of the liquid crystal element is determined by the product of the birefringence Δn of the liquid crystal material and the thickness d of the liquid crystal layer. The chromaticity of the transmitted light is determined at the same time. That is, when the amount of birefringence Δn of the liquid crystal material used is constant, the chromaticity of transmitted light is determined by the thickness d of the liquid crystal layer, and at the same time, the transmittance is also determined.

Further, there are known liquid crystal elements utilizing a birefringence mode, such as a ferroelectric liquid crystal element, an antiferroelectric liquid crystal element, and a bistable liquid crystal disclosed in Japanese Patent Publication No. 1-51818. Nematic liquid crystal device utilizing AS, AS
In the IA DISPLAY '95, p.
-Plane Switching Mode and the like.

[0008]

By the way, in the conventional liquid crystal display device, in order to make the lighting color of the liquid crystal display device white, the color of the transmitted light of the liquid crystal element must also be adjusted to white. The liquid crystal element is adjusted to white by adjusting the color of the transmitted light of the liquid crystal layer by adjusting the birefringence Δn of the liquid crystal material and the thickness d of the liquid crystal layer because the constituent materials such as the transparent electrodes have a small degree of freedom in design. . It is desirable that the transmittance of the liquid crystal element be high.

However, conventionally, the liquid crystal layer of the liquid crystal element has a strong wavelength dependence of the transmittance of the liquid crystal element as shown in FIG. 11, and the product of the birefringence Δn of the liquid crystal material and the thickness d of the liquid crystal layer. (Δnd) is any value (Δnd = 0.1 in the figure)
8, 0.23, 0.275, 0.32), coloration cannot be avoided. For example, in FIG. 11, when Δnd = 0.275, which is the most advantageous for the transmittance of the liquid crystal element, is set, the transmittance on the single wavelength side is reduced, so that the liquid crystal element becomes yellowish.

In a conventional liquid crystal display device in which such a liquid crystal element is combined with a backlight device for illuminating the liquid crystal element from the back side with general white light, the lighting color becomes yellow and the display quality is extremely poor. It will be.

Accordingly, an object of the present invention is to provide a liquid crystal display device capable of obtaining a good white display color and an information transmitting device provided with the liquid crystal display device.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a liquid crystal element having a liquid crystal sandwiched between a pair of substrates, and a backlight device for illuminating the liquid crystal element from the back side. , The desired chromaticity of white display of the liquid crystal display device is defined as x (FL), y (F
L), the chromaticity of the lighting color of the backlight device is x (B
L), y (BL), and the chromaticity of transmitted light of the liquid crystal element when the liquid crystal element is illuminated from the back side with equal energy white light by the backlight device is x (LC), y (LC).
{X (FL) −x (LC)} · {x (BL) −x (F
L)｝> 0 and {y (FL) −y (LC)} · {y (BL) −y (F
L)｝> 0 is simultaneously satisfied.

[0013] Further, when the backlight device illuminates from the rear side with white light of equal energy, the chromaticity of the transmitted light of the liquid crystal element and the chromaticity of the lighting color of the backlight device have a complementary color relationship. It is characterized by having.

Further, when the backlight device illuminates the liquid crystal element from the back side with equal energy white light, the chromaticity of the transmitted light of the liquid crystal element is x (LC), y (LC), z (LC).
= 1−x (LC) −y (LC), and the chromaticity of the lighting color of the backlight device is x (BL), y (BL), z (BL).
= 1−x (BL) −y (BL), z (LC) / x (LC)> 1, and z (BL) / x (BL) <z (LC) / x (LC) z (LC) / x (LC) <1 and z (BL) / x (BL)> z (LC) / x (LC).

Further, an information transmitting apparatus according to the present invention includes a graphic controller for outputting an image data signal and a scanning method signal, a scanning signal control circuit for outputting scanning line address data and a scanning method signal, a display data and a scanning method. It is characterized by including an information signal control circuit for outputting a signal and any one of the liquid crystal display devices described above.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic sectional view showing a liquid crystal display device according to a first embodiment of the present invention. The liquid crystal display device 1 includes a transmission type liquid crystal element 2 utilizing a birefringence mode.
And a backlight device 3 for illuminating the liquid crystal element 2 from the back side. The liquid crystal element 2 and the backlight device 3 are held by a main body 4.

As shown in FIG. 2, the liquid crystal element 2 includes a pair of glass substrates 6a and 6b opposed to each other between the polarizing plates 5a and 5b. Transparent electrodes 7a and 7b made of ITO
And rubbed alignment films 8a and 8b are formed, respectively. Between the transparent electrodes 7a and 7b and the alignment films 8a and 8b, Ta is used as a short prevention layer between the transparent electrodes 7a and 7b.
₂ O ₅ or the like of the insulating film 9a, 9b are formed.

The glass substrates 6a and 6b are separated from the spherical spacer beads 10 by a predetermined substrate gap (for example, 1.0 μm).
m), and a chiral smectic liquid crystal 11 having bistability with respect to an electric field is injected between the glass substrates 6a and 6b. The transparent electrodes 7a and 7b are arranged in a matrix, and a pixel is formed by the intersection. The rubbing directions of the alignment films 8a and 8b are processed so as to be parallel and the same direction. Also,
Polarizing plate 5 located on the observation side (upper side in the figure) of liquid crystal element 2
A protection plate 12 is attached above “a”.

As shown in FIG. 3, the backlight device 3 comprises a square light guide 13 and fluorescent tubes 14a, 14b, 14c, 14d arranged on each side of the light guide 13.
The reflectors 15a, 15b, 15c, and 15d are provided on the back of the fluorescent tubes 14a, 14b, 14c, and 14d. Further, a diffusion plate and a diffusion reflection plate (not shown) are arranged on both surfaces of the light guide 13, respectively.

A blue phosphor ((SrCaBaMg) ₅ (Pr) (not shown) is provided in the fluorescent tubes 14a, 14b, 14c, and 14d.
O) ₃ Cl: Eu), green phosphor (LaPO ₄ : Ce: T)
b), and a red phosphor (Y ₂ O ₃ : Eu) is mixed and applied. The ratio of these phosphors is determined by the following formula according to the substrate gap (the thickness of the liquid crystal layer) of the liquid crystal element 2. (1),
Adjustments are made to satisfy (2), (3), (4), (5), and (6).

That is, in the present invention, the chromaticity of the desired white display of the liquid crystal display device 1 is x (FL), y (FL), and the chromaticity of the lighting color of the backlight device 3 is x (BL), y (BL). ),
When the chromaticity of the transmitted light of the liquid crystal element 2 when the liquid crystal element 2 is illuminated by the backlight device 3 from the back side with equal energy white light is x (LC), y (LC), ｛x (FL) − x (LC)｝ · {x (BL) −x (FL)｝> 0 (1) {y (FL) −y (LC)} · {y (BL) −y (FL)}> 0 ( 2) so that the fluorescent tubes 14a, 14b, 14
The light emission characteristics of c and 14d are adjusted (details will be described later).

Further, when the liquid crystal element 2 is illuminated by the backlight device 3 from the back side with white light of equal energy, the chromaticity of the transmitted light of the liquid crystal element 2 is represented by x (LC), y (LC), z
(LC) = 1−x (LC) −y (LC), and the chromaticity of the lighting color of the backlight device 3 is x (BL), y (BL), z
When (BL) = 1−x (BL) −y (BL), z (LC) / x (LC)> 1 (3) z (BL) / x (BL) <z (LC) / x (LC) ... (4) or z (LC) / x (LC) <1 ... (5) z (BL) / x (BL)> z (LC) / x (LC) ... (6) And the fluorescent tubes 14a, 14b, 14c, 14
d is adjusted, and the chromaticity of the transmitted light of the liquid crystal element 2 when the liquid crystal element 2 is illuminated by the backlight device 3 with the equal energy white light from the back side is x (LC), y.
(LC), the chromaticity of the lighting color of the backlight device 3 is represented by x (B
L) and y (BL), the emission of the fluorescent tubes 14a, 14b, 14c and 14d is such that the values of y (LC) / x (LC) and y (BL) / x (BL) are substantially equal. The characteristics are adjusted (details will be described later).

Further, when the liquid crystal element 2 is illuminated from the back side with the equal energy white light by the backlight device 3, the chromaticity of the transmitted light of the liquid crystal element 2 and the chromaticity of the lighting color of the backlight device 3 are different. Complementary colors are set.

The transparent electrode 7 of the liquid crystal element 2 described above
Writing is performed by applying a driving waveform for driving the chiral smectic liquid crystal 11 as shown in FIG. 4 between a and 7b, for example. In this figure, (a) is a scanning selection signal, a selection pulse having a pulse width ΔT, an erase pulse having a pulse width of 2.5ΔT immediately before the selection pulse, and a pulse width 1 / 2ΔT immediately after the selection pulse. (B) is a scanning non-selection signal of 0 V,
(C) is an information signal for bright display, and has a pulse width ΔT.
, And an auxiliary pulse having a pulse width of 1 / 2ΔT before and after the selection pulse. (D) is an information signal for dark display, and the polarity of the bright display signal in (c) is inverted. It is. In this figure, 1H represents one horizontal scanning period, and ΔT represents a selection period.

The liquid crystal display device 1 according to the present embodiment is configured as described above, and includes the transparent electrode 7 of the liquid crystal element 2.
A predetermined driving waveform is applied between a and 7b to drive the chiral smectic liquid crystal 11, so that the display color of the liquid crystal element 2 is changed to white display (the liquid crystal layer of the chiral smectic liquid crystal 11 is in a transmissive state), and the backlight is applied from the back side. FIG.
The chromaticity (x, y) of the transmitted light of the liquid crystal element 2 when illuminated with the equal energy white light having the spectral characteristics shown in (2) was (0.29, 0.33). Note that the chromaticity of the transmitted light of the liquid crystal element 2 is calculated from the spectral transmittance, and in the present embodiment, the substrate gap between the glass substrates 6a and 6b (the thickness of the liquid crystal layer) is 1.0 μm.

Further, in the liquid crystal display device 1 described above,
A predetermined driving waveform is applied between the transparent electrodes 7a and 7b of the liquid crystal element 2 to drive the chiral smectic liquid crystal 11, and the display color of the liquid crystal element 2 is changed to white display (the liquid crystal layer of the chiral smectic liquid crystal 11 is in a transmission state). The chromaticity (x, y) of the transmitted light of the liquid crystal element 2 when illuminated by the backlight device 3 having the chromaticity (x, y) of the lighting color (x, y) of (0.31, 0.34) from the back side is At (0.29, 0.33), the transmitted light looked good white.

In this embodiment, in addition to the liquid crystal element 2 having a substrate gap (thickness of the liquid crystal layer) of 1.0 μm, the substrate gap (thickness of the liquid crystal layer) is 0.8 μm each.
m, 1.3 μm, 1.5 μm, and 1.8 μm liquid crystal elements (other structures are the same as the liquid crystal element 2 described above), and the display colors of these liquid crystal elements are displayed in white as described above. (The liquid crystal layer is in a transmissive state), and the chromaticity (x, y) of the transmitted light of each liquid crystal element when illuminated by the backlight device 3 with equal energy white light from the back side is shown in Table 1 and FIG. The result was as follows. The chromaticity (x, y) of the transmitted light of each liquid crystal element was calculated from the spectral transmittance.

[0029]

[Table 1] In addition, the display color of these liquid crystal elements is changed to white display (the liquid crystal layer is in a transmissive state), and the backlight device 3 whose chromaticity (x, y) of the lighting color is (0.31, 0.34) from the back side. The chromaticity (x, y) of the transmitted light of each liquid crystal element at the time of illumination was as shown in Table 2.

[0030]

[Table 2] Next, the lighting color of the backlight device 3 is changed (the lighting color is changed by adjusting the molecular weights of the blue, green, and red phosphors applied to the fluorescent tubes 14a, 14b, 14c, and 14d described above). Was observed), and the display color appearance of the liquid crystal element 2 having a substrate gap (the thickness of the liquid crystal layer) of 1.0 μm was observed. At this time, a figure such as a triangle or a rectangle was displayed in black and white on the liquid crystal element 2 and the appearance of display colors in white display of the liquid crystal element 2 was observed under indoor lighting.
The result was as shown in the figure.

[0031]

[Table 3] In Table 3 and FIG. 7, ○ indicates white, Δ indicates slightly colored white, and X indicates not white.

From these results, it is considered that the chromaticity of white display desirable for the liquid crystal display device 1 is in the following range.

Chromaticity of white display (x, y) = (0.30 ±
0.03, 0.35 ± 0.03) However, this result is based on the display pattern (pictures, number of colors, etc.) used during observation, application, individual difference of observer (gender, age, nationality, etc.), lighting conditions, etc. And it is not limited to this range.

Based on the above results, the substrate gap (the thickness of the liquid crystal layer) was set to 0.8 μm and 1.0 μm, respectively.
When the chromaticity of each liquid crystal element of μm, 1.3 μm, 1.5 μm, and 1.8 μm and the chromaticity of the lighting color of the backlight device were combined, and the appearance of the display color of each liquid crystal element when displaying white was observed. As shown in Table 4 and FIG. 8, the result that the white display color was good in all the combinations was obtained.
In FIG. 8, black circles indicate the chromaticity of each liquid crystal element, and black triangles indicate the corresponding chromaticity of the lighting color of each backlight device.

[0035]

[Table 4] From the results shown in Table 4, the liquid crystal display device 1 according to the present embodiment sets the chromaticity of the desired white display of the liquid crystal display device 1 to x (F
L), y (FL), the chromaticity of the lighting color of the backlight device 3 is x (BL), y (BL), and the illuminance of the liquid crystal element 2 when the backlight device 3 illuminates from the back side with white light of equal energy. When the chromaticity of the transmitted light is x (LC), y (LC),
Equations (1) and (2) described above are satisfied.

Also, from the results shown in FIG. 8, in the liquid crystal display device 1 according to the present embodiment, the substrate gap (the thickness of the liquid crystal layer) is 0.8 μm, 1.0 μm, 1.3 μm,
The chromaticity of each of the 1.5 μm and 1.8 μm liquid crystal elements is substantially aligned on a straight line, and the straight line passes near the origin of the chromaticity diagram.
If the chromaticity of each liquid crystal element is x (LC), y (LC),
The slope of this straight line is approximately y (LC) / x (LC). The chromaticity of each liquid crystal element is determined by the substrate gap (the thickness of the liquid crystal layer).
Moves from blue to yellow on this straight line as this line becomes larger, and this straight line is in a desirable range of white display (chromaticity (x, y) of white display = (0.30 ± 0.03, 0. 35 ±
0.03)). Further, the chromaticities of the lighting colors of the respective backlight devices are arranged substantially on a straight line, and if the chromaticities of the lighting colors of the backlight devices are x (BL) and y (BL), the inclination of the straight lines is approximately y (BL). ) / X (BL). Then, the slope of the straight line of the chromaticity of the liquid crystal element (y (LC) / x
(LC)) and the slope (y (BL) / x (BL)) of the straight line of the chromaticity of the lighting color of the backlight device are substantially equal.

Further, from the results shown in FIG. 8, the liquid crystal display device 1 according to the present embodiment shows that the chromaticity of the transmitted light of the liquid crystal element when illuminated with the equal energy white light from the back side by the backlight device is obtained. x (LC), y (LC), z (LC) =
1−x (LC) −y (LC), the chromaticity of the lighting color of the backlight device is x (BL), y (BL), z (BL) = 1−1
When x (BL) −y (BL), the above-described equation (3) is used.
(4), (5), and (6) are satisfied.

Accordingly, the chromaticity of the transmitted light of the liquid crystal element when illuminated with the equal energy white light from the back side by the backlight device and the chromaticity of the lighting color of the backlight device have a complementary color relationship. For example, by using a backlight device of a yellow display for a liquid crystal element of a blue display and a backlight device of a blue display for a liquid crystal element of a yellow display, each liquid crystal element can be changed according to a substrate gap (thickness of a liquid crystal layer). A desired white display color can be obtained by compensating for the chromaticity change.

Next, in the liquid crystal display device according to the second embodiment of the present invention, a transmission type liquid crystal element sandwiching a chiral nematic liquid crystal is used. This chiral nematic liquid crystal is prepared by adding a nematic liquid crystal composition (for example, manufactured by Chisso Corporation; trade name: KN-4000) to an optically active agent (for example,
Merck Co., Ltd .; trade name: S-811) was added, and the helical pitch P was set to 3.4 μm.

This liquid crystal element has a structure in which I
A transparent electrode made of TO is formed, and a polyimide alignment film (for example, manufactured by Nissan Chemical Industries, Ltd .; trade name: SE-314)
After forming 0), a rubbing treatment was performed. The pair of glass substrates was bonded via spacer beads so that the rubbing directions were antiparallel, and the substrate gap (the thickness of the liquid crystal layer) was set to 2.0 μm. At this time, the pretilt angle was 4 degrees, and the initial orientation was π twist orientation.

The backlight device arranged on the back side of the liquid crystal element is the same as in the first embodiment.

Also in this embodiment, in addition to the liquid crystal element having the above-mentioned substrate gap (thickness of liquid crystal layer) of 2.0 μm, each of the substrate gaps (thickness of liquid crystal layer) is 1.3.
Liquid crystal devices having a thickness of 1.7 μm, 1.7 μm, and 2.4 μm were manufactured.
At this time, the chiral nematic liquid crystal adjusts the helical pitch P by adjusting the addition amount of the optically active agent,
The ratio d / P to the substrate gap (the thickness of the liquid crystal layer) d is d / P.
P ≒ 0.6. The initial orientation was a π twist orientation.

Then, for example, FIG.
Are applied under the following conditions.

In the driving waveform of FIG. 9, V _reset = ± 1
5v, V _select = V _non-select = ± 2v, pulse width Δt
When a refresh scan of 1/100 duty was performed under a drive condition of = 2 ms, a uniform orientation of 0 twist was formed, and a "bright" display was obtained. Also, V _select
When driven under the same conditions except that = 0 v was set, 2π twist alignment was formed and “dark” was displayed, and the contrast at this time was about 50.

Table 5 shows the chromaticity of the transmitted light of each liquid crystal element when each liquid crystal element having the above-mentioned substrate gap (thickness of the liquid crystal layer) was illuminated from the back side with equal energy white light by a backlight device. It is a measurement result of (x, y). The chromaticity (x, y) of the transmitted light of each liquid crystal element was calculated from the spectral transmittance.

[0046]

[Table 5] In addition, when the lighting color of the backlight device was adjusted for these liquid crystal elements in the same manner as in the first embodiment, it was confirmed that good white display colors were obtained for all combinations.

FIG. 10 is a block diagram showing the configuration of an information transmission device including the above-described liquid crystal display device 1 according to the present invention. The information transmission device 30 includes the above-described liquid crystal display device 1, a drive control unit 31, and a graphic controller 3.
I have two.

The drive control unit 31 includes the scanning signal application circuit 3
3, an information signal application circuit 34, a scanning signal control circuit 35, an information signal control circuit 36, and a drive control circuit 37. The scanning signal control circuit 35 and the information signal control circuit 36
, Image data, a scanning method signal (AH / DL signal), and the like are input from the graphic controller 32 via the drive control circuit 37. The image data is converted into scanning line address data and display data by a scanning signal control circuit 35 and an information signal control circuit 36, respectively, and the scanning method signal is directly input to a scanning signal applying circuit 33 and an information signal applying circuit 34. You. The scanning signal applying circuit 33 applies a scanning signal having a waveform determined by the scanning method signal to the transparent electrode (scanning electrode) 7a of the liquid crystal display device 1 determined by the scanning line address data. It is controlled so as to apply a white or black display content sent by display data to the transparent electrode (signal electrode) 7b of the device 1 and an information signal having a waveform determined by two of a scanning method signal, and is constituted by a large number of pixels. An image is displayed on the screen. The SYNC signal is a signal for synchronizing the drive controller 31 and the graphic controller 32.

As described above, since the information transmitting device 30 according to the present embodiment includes the above-described liquid crystal display device 1 according to the present invention, a good white display color can be obtained.
High-quality display can be performed.

[0050]

As described above, in the liquid crystal display device according to the present invention, good display colors can be obtained without being affected by the substrate gap of the liquid crystal element (thickness of the liquid crystal layer), so that the display quality can be improved. Can be improved.

Further, in the information transmission device provided with the liquid crystal display device according to the present invention, the liquid crystal display device can obtain a good white display color, and can perform high-quality display over the entire screen. it can.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a liquid crystal element of the liquid crystal display device according to the present invention.

FIG. 3 is a schematic sectional view showing a backlight device of the liquid crystal display device according to the present invention.

FIG. 4 is a diagram showing an example of a driving waveform for driving a liquid crystal.

FIG. 5 is a diagram illustrating spectral characteristics of equal energy white light of a backlight device.

FIG. 6 is a diagram showing chromaticity of transmitted light of the liquid crystal element according to the present invention.

FIG. 7 is a diagram illustrating the chromaticity of a display color during white display according to the present invention.

FIG. 8 is a diagram showing chromaticity of transmitted light of a liquid crystal element according to the present invention and lighting colors of a backlight device.

FIG. 9 is a diagram showing an example of a driving waveform for driving a liquid crystal.

FIG. 10 is a block diagram showing a configuration of an information transmission device according to the present invention.

FIG. 11 is a diagram showing an example of the relationship between the transmittance of a liquid crystal layer and the wavelength.

[Description of Signs] 1 Liquid crystal display device 2 Liquid crystal element 3 Backlight device 5a, 5b Polarizer 6a, 6b Glass substrate (substrate) 7a, 7b Transparent electrode 8a, 8b Alignment film 11 Liquid crystal (chiral smectic liquid crystal) 13 Light guide 14a, 14b, 14c, 14d Fluorescent tube 30 Information transmission device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jun Iba 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (10)

[Claims] 1. A liquid crystal display device comprising: a liquid crystal element having a liquid crystal interposed between a pair of substrates; and a backlight device for illuminating the liquid crystal element from the back side. To x (FL),
y (FL), the chromaticity of the lighting color of the backlight device is x
(BL), y (BL), and the chromaticity of transmitted light of the liquid crystal element when the liquid crystal element is illuminated with white light of equal energy from the back side by the backlight device is x (LC), y (L).
C), {x (FL) −x (LC)} · {x (BL) −x (F
L)｝> 0 and {y (FL) −y (LC)} · {y (BL) −y (F
L) The following condition is satisfied simultaneously:｝> 0. 2. The chromaticity of the transmitted light of the liquid crystal element and the chromaticity of the lighting color of the backlight device when the backlight device is illuminated with equal energy white light from the back side from the back side have a complementary color relationship. The liquid crystal display device according to claim 1. 3. The chromaticity of the transmitted light of the liquid crystal element when illuminated from the back side with equal energy white light by the backlight device is x (LC), y (LC), z (LC) = 1.
-X (LC) -y (LC), where the chromaticity of the lighting color of the backlight device is x (BL), y (BL), z (BL) = 1.
When -x (BL) -y (BL), z (LC) / x (LC)> 1 and z (BL) / x (BL) <z (LC) / x (LC) or z ( The liquid crystal display device according to claim 1, wherein LC) / x (LC) <1 and z (BL) / x (BL)> z (LC) / x (LC). 4. The illuminance of transmitted light of the liquid crystal element is x (LC), y (LC) when illuminated by the backlight device with equal energy white light from the back side, and the lighting color of the backlight device. The chromaticity of x (BL) and y (BL) is defined as: y (LC) / x (LC) is substantially equal to y (BL) / x (BL). The liquid crystal display device according to the item. 5. The liquid crystal display device according to claim 1, wherein the liquid crystal element transmits light in a birefringent mode. 6. The liquid crystal according to claim 1, wherein the light source of the backlight device is formed by mixing a blue phosphor, a green phosphor, and a red phosphor at a predetermined ratio and applying the mixture to a fluorescent tube. Display device. 7. The liquid crystal display device according to claim 1, wherein the liquid crystal is a chiral smectic liquid crystal. 8. The liquid crystal display according to claim 1, wherein the liquid crystal is a nematic liquid crystal. 9. The liquid crystal display device according to claim 1, wherein the liquid crystal is a chiral nematic liquid crystal. 10. A graphic controller for outputting an image data signal and a scanning method signal, a scanning signal control circuit for outputting scanning line address data and a scanning method signal, and an information signal control circuit for outputting display data and a scanning method signal. An information transmission device, comprising: the liquid crystal display device according to claim 1.