JPH1096918A - Color reflection type guest-host liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the utilization efficiency of incident light of a color reflection type guest-host liquid crystal display device and to simplify the structure thereof. SOLUTION: This color reflection type guest-host liquid crystal display device has a pair of upper and lower substrates 1, 2, guest-host liquid crystals 3, a quarter- wavelength plate layer 4 and a color reflection layer 5. The substrate 2 on the lower side exists on an incident side and pixel electrodes 6 are formed thereon. The substrate 1 on the upper side exists on an opposite side and counter electrodes 8 are formed thereon. This substrate is joined to the substrate 2 on the lower side via a spacing and matrix-like pixels are regulated between both electrodes 6 and 8 disposed to face each other. The guest-host liquid crystals 3 contain dichromatic dyestuff 10 and are held in the spacing between both substrates. The quarter-wavelength plate layer 4 is interposed between the substrate 1 on the opposite side and the guest-host liquid crystals 3. The color reflection layer 5 is interposed between the substrate 1 on the opposite side and the quarter-wavelength plate layer 4 and reflects the incident light past the quarter-wave plate layer 4 selectively in wavelength in a pixel unit, thereby enabling color display.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a color reflection type guest-host liquid crystal display device. More specifically, the present invention relates to a structure in which a color filter layer and a light reflection layer are integrated.

[0002]

2. Description of the Related Art Liquid crystal display devices have attracted attention instead of CRTs. A display using a liquid crystal is characterized by being thin, lightweight, and low in power consumption, and being easily portable increases the commercial value. However,
A liquid crystal display used for a monitor of a notebook personal computer or a monitor of a video camera is a transmissive type, and thus requires a backlight. Due to the backlight, there is a disadvantage that the thickness of the display is increased and the battery is consumed.
In order to color the transmissive liquid crystal display,
Generally, a micro color filter composed of a set of colored segments corresponding to each pixel is used. In order to apply a color liquid crystal display to various devices in the future, it is important to eliminate disadvantages caused by using a backlight. Therefore, a reflection-type liquid crystal display has recently attracted attention. In this method, external light such as sunlight or indoor light is used, and the reflected light is used to allow a human eye to recognize an image. Since no backlight is used, a liquid crystal display that consumes low power and can display a beautiful full-color image when combined with a micro color filter can be obtained.

There are various types of reflective liquid crystal displays. Among them, a guest-host liquid crystal display device in which a quarter-wave plate layer and a light reflection layer are integrated in a panel is one of the most excellent structures. This reflection type guest-host liquid crystal display device is disclosed in, for example, JP-A-6-222351, and FIG. 5 shows a cross-sectional structure thereof. The reflection type liquid crystal display device 101 includes a pair of upper and lower substrates 102 and 1
03, guest-host liquid crystal 1 containing dichroic dye 105
04, a pair of upper and lower transparent electrodes 106 and 110, a pair of upper and lower alignment layers 107 and 111, a light reflection layer 108, and a quarter-wave plate layer 109. A pair of substrates 1
02 and 103 are made of an insulating material such as glass, quartz and plastic. Also, at least the upper substrate 102 located on the incident side is transparent. A dichroic dye 105 is provided between the pair of substrates 102 and 103.
Is held. The guest host liquid crystal 104 mainly includes nematic liquid crystal molecules 104a. The dichroic dye 105 is a so-called p-type dye having a transition dipole moment substantially parallel to the long axis of the molecule. On the inner surface 102a of the upper substrate 102, although not shown, a switching element composed of a thin film transistor or the like is integrally formed. The transparent electrodes 106 are patterned in a matrix as pixel electrodes, and are driven by corresponding switching elements. Further, the upper substrate 102
Is covered with an alignment layer 107 made of a polyimide resin or the like. The surface of the alignment layer 107 is, for example, subjected to a rubbing treatment, so that the nematic liquid crystal molecules 104a are horizontally aligned. On the other hand, on the inner surface 103a of the lower substrate 103 located on the reflection side, a light reflection layer 108 made of aluminum or the like and a quarter-wave plate layer 109 made of a polymer liquid crystal or the like are formed in this order. Further, on the quarter-wave plate layer 109, a transparent electrode 110 having a solid pattern and serving as a counter electrode and an alignment layer 111 are formed in this order.

Next, the operation of the reflective guest-host liquid crystal display device 101 for monochrome display will be briefly described. In the state where no voltage is applied, the nematic liquid crystal molecules 104a are horizontally aligned and the dichroic dye 1
05 is similarly oriented. When the light incident from the upper substrate 102 side travels to the guest-host liquid crystal 104, a component of the incident light having a vibration plane parallel to the major axis direction of the molecules of the dichroic dye 105 is caused by the dichroic dye 105. Absorbed.
A component of the dichroic dye 105 having a vibration plane perpendicular to the major axis direction of the molecule passes through the guest-host liquid crystal 104,
The light is circularly polarized by the quarter-wave plate layer 109 formed on the surface 103 a of the lower substrate 103, and reflected by the light reflecting layer 108. At this time, the polarization of the reflected light is reversed, passes through the quarter-wave plate layer 109 again, and becomes a component having a vibration plane parallel to the major axis direction of the molecules of the dichroic dye 105. Since this component is absorbed by the dichroic dye 105, a complete black display is obtained. On the other hand, when a voltage is applied, the nematic liquid crystal molecules 104a are vertically oriented along the direction of the electric field, and the dichroic dye 105 is similarly oriented. Light incident from the upper substrate 102 side passes through the guest-host liquid crystal 104 without being absorbed by the dichroic dye 105, and is further reflected by the light reflecting layer 108 without being affected by the quarter-wave plate layer 109. . The reflected light passes through the quarter-wave plate layer 109 again and exits without being absorbed by the guest-host liquid crystal 104.
Therefore, white display is obtained.

[0005]

In the above description, the case where black-and-white display is performed using the reflection type guest-host liquid crystal display device has been described. However, in order to perform full-color display, it is necessary to form a micro color filter in the panel. is there. Conventionally, a reflection type liquid crystal display device has been made full color by using a micro color filter used for a transmission type liquid crystal display device as it is. That is, the light transmission type micro color filter is formed on the inner surface of the incident side substrate. Therefore, it has a structure separated from the light reflection layer formed on the reflection side substrate. Conventional transmissive micro color filters and light reflective layers are separated from each other and have poor transmission and reflection efficiencies, respectively, resulting in low contrast and insufficient brightness. Was a serious drawback.

[0006]

The following means have been taken in order to solve the above-mentioned problems of the prior art. That is, the color reflective guest-host liquid crystal display device according to the present invention basically includes a pair of substrates, a guest-host liquid crystal, a quarter-wave plate layer, and a color reflective layer. One of the substrates is located on the incident side and has an electrode of a predetermined pattern. The other substrate is located on the reflection side and has electrodes of a predetermined pattern formed thereon. The electrodes are joined to the one substrate via a gap and define a matrix-shaped pixel between the two electrodes facing each other. The guest host liquid crystal contains a dichroic dye and is held in the gap. The quarter-wave plate layer is interposed between the other substrate located on the reflection side and the guest-host liquid crystal. As a feature, the color reflection layer is interposed between the substrate on the reflection side and the quarter-wave plate layer, and selectively reflects incident light passing through the quarter-wave plate layer in pixel units. To enable color display.

In one embodiment, a plurality of pixel electrodes patterned in a matrix and switching elements for individually driving the pixel electrodes are integrally formed on the one substrate located on the incident side, and are located on the reflection side. On the other substrate, a solid pattern counter electrode is formed, and an active matrix type pixel is defined between the pixel electrode and the counter electrode facing each other. Further, the color reflection layer is formed of a reflective colored coating film formed by partitioning each pixel along the surface of the other substrate located on the reflection side, and has different wavelength selectivity for each partition. Alternatively, the color reflective layer is formed of a transparent colored film formed for each pixel along the light diffusive reflective surface of the other substrate located on the reflective side, and has a different wavelength selectivity for each partition. . Alternatively, the color reflection layer may be formed integrally as at least a part of the surface of the other substrate located on the reflection side. In some cases, the color reflective layer may contain a fluorescent material. In another embodiment, the color reflection layer includes a wavelength selection element formed for each pixel along a surface of the other substrate located on the reflection side, and a control voltage supplied from the other substrate. , The wavelength selectivity to the incident light changes, and one pixel exhibits a plurality of colored states. The wavelength selection element includes, for example, an optical cell having a parallel plate electrode structure, and when the cell gap changes according to a control voltage, the wavelength selectivity for incident light passing through the optical cell changes. The other substrate located on the reflection side is made of glass,
It is made of a material selected from quartz, ceramic, plastic and metal.

According to the present invention, a color reflection layer is used in which a light reflection layer and a color filter layer, which have been conventionally separated separately, are integrated. By using this new color filter, it is possible to provide a reflective display that is bright and has good color purity. The basic idea is that
A color reflection layer is formed on the inner surface of the substrate located on the reflection side, and the substrate itself is colored in three primary colors. The structure is such that a guest-host liquid crystal is bonded to the color reflection substrate. The guest host liquid crystal is a light modulation element that controls gradation and contrast for each of three primary colors corresponding to pixels. In this way, by more clearly separating the wavelength-selective reflection of the incident light and the light modulation of the incident light, it becomes possible to obtain a reflection-type guest-host liquid crystal display device with high utilization efficiency of the incident light.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic partial sectional view showing a first embodiment of a color reflection type guest-host liquid crystal display device according to the present invention. To facilitate understanding,
Only three pixels corresponding to the three primary colors are shown in the figure. The color reflection type guest-host liquid crystal display device basically has a pair of upper and lower substrates 1 and 2,
And a quarter-wave plate layer 4 and a color reflection layer 5. The lower substrate 2 is located on the incident side and has an electrode of a predetermined pattern. In this example, this electrode is the pixel electrode 6 patterned in a matrix. The surface of the pixel electrode 6 is covered with an alignment film 7. The alignment film 7 is made of, for example, a polyimide film and has been subjected to a rubbing treatment in a predetermined direction. The lower substrate 2 is made of a transparent insulating material such as glass or quartz because it is located on the incident side. The pixel electrode 6 is also made of a transparent conductive film such as ITO. On the other hand, the upper substrate 1 is located on the reflection side and has an electrode of a predetermined pattern. In the present embodiment, this electrode is a solid pattern opposite electrode 8. The upper substrate 1 is bonded to the lower substrate 2 via a gap, and defines a matrix of pixels between the opposing electrode 8 and the pixel electrode 6 facing each other.
The surface of the counter electrode 8 is also covered with an alignment film 9 made of a rubbed polyimide film or the like. The guest host liquid crystal 3 contains a black dichroic dye 10 and is held in a gap between the upper and lower substrates 1 and 2. In the present embodiment, the guest-host liquid crystal 3 is horizontally aligned by the action of the alignment films 9 and 7 which are in contact from above and below. Following this, the dichroic dye 10 is also horizontally oriented. Pixel electrode 6
When a signal voltage is applied between the liquid crystal 3 and the counter electrode 8, the guest-host liquid crystal 3 changes to a vertical alignment, and accordingly, the dichroic dye 1
0 is also vertically aligned. The dichroic dye 10 does not absorb incident light in a vertically aligned state, and the incident light is reflected by the color reflection layer 5 for each pixel. It should be noted that the present invention is not limited to the case where the guest-host liquid crystal 3 is horizontally aligned in the initial state, but may employ a vertical alignment. In this case, when a signal voltage is applied between the pixel electrode 6 and the counter electrode 8, the guest-host liquid crystal 3 changes from vertical alignment to horizontal alignment, and the dichroic dye 10 is also switched to horizontal alignment. Be replaced. The quarter-wave plate layer 4 is the substrate 1 located on the reflection side.
And the guest-host liquid crystal 3. Specifically, the quarter-wave plate layer 4 is formed of a uniaxially oriented liquid crystal polymer film or the like, and is formed on the substrate 1. The above-described counter electrode 8 is formed of a solid pattern on the quarter-wave plate layer 4. Since the upper substrate 1 is located on the reflection side, it is not always necessary to use a transparent material. Typically,
The substrate 1 located on the reflection side is made of a material selected from glass, quartz, ceramic, plastic, and metal.

The color reflection layer 5 which is a characteristic element of the present invention is interposed between the reflection-side substrate 1 and the quarter-wave plate layer 4,
Incident light that has passed through the quarter-wave plate layer 4 is wavelength-selectively reflected in pixel units to enable color display. In the present embodiment, the color reflective layer 5 is formed of a reflective colored coating film 5a formed for each pixel along the surface of the substrate 1 located on the reflective side, and has different wavelength selectivity for each section. doing. In some cases, the color reflection layer 5 may be integrally formed as at least a part of the surface of the substrate 1 located on the reflection side. Specifically, the surface of the substrate 1 may be colored or dyed along the divisions into three primary colors. In the present embodiment, a colored coating film 5a formed on the surface of the substrate 1 is used. The colored coating film 5a is made of printing ink or the like, and is divided into three primary colors for each section corresponding to a pixel. In the present embodiment, the three primary colors of the colored coating film 5a are red,
Green and blue (RGB) are adopted. Instead of this, it goes without saying that the three primary colors of yellow, cyan, and magenta (YCM) may be adopted. As described above, in the present invention, the color reflection layer 5 which is a reflection type color filter is used in place of the conventional transmission type micro color filter. In brief, the color reflective layer 5 may be formed by dividing a layer similar to that used for printing or coloring of plastic into sections to form three primary colors. That is, the color reflection layer 5 reflects only the three primary colors (for example, RGB) and absorbs the other colors. Therefore, the transmittance does not have to be a problem unlike the conventional transmission type micro color filter. In the present invention, since the substrate 1 located on the reflection side does not need to be transparent, plastic or ceramic may be used as a constituent material. Therefore, the reflection substrate 1 having high reflection efficiency can be easily formed even with a complicated shape by pressing or the like.

The color reflection type guest-host liquid crystal display device according to the first embodiment has a so-called active matrix structure. That is, a plurality of pixel electrodes 6 patterned in a matrix and switching elements for individually driving these are integrally formed on the surface of the substrate 2 located on the incident side. In the present embodiment, this switching element comprises the thin film transistor 11. On the other hand, a counter electrode 8 of a solid pattern is formed on the upper substrate 1 located on the reflection side, and an active matrix type pixel is defined between the pixel electrode 6 and the counter electrode 8 facing each other. The thin film transistor 11 has a bottom gate structure, and a gate electrode G is formed on the surface of the substrate 2 by patterning. A gate insulating film 12 is formed so as to cover the gate electrode G. On the gate insulating film 12, a semiconductor thin film 13 made of polycrystalline silicon or the like patterned in an island shape is formed. Semiconductor thin film 13
An etching stopper 14 is formed on the substrate so as to match the gate electrode G. The signal wiring 15 is connected to the source region S of the semiconductor thin film 13, and the corresponding pixel electrode 6 is connected to the drain region D. Note that a flattening film 16 is interposed between the pixel electrode 6 and the thin film transistor 11. The pixel electrode 6 is electrically connected to the drain region D of the thin film transistor 11 via a contact hole opened in the flattening film 16.

As described above, in the present embodiment, the thin film transistor 11 and the pixel electrode 6 are formed on the incident side substrate 2 while the quarter wavelength plate layer 4 and the counter electrode 8 are formed on the reflection side substrate 1.
Is formed. In particular, the quarter-wave plate layer 4 can be formed over the entire surface of the substrate 1, and the manufacturing process is simplified. Therefore, separation for each pixel is performed on the incident side substrate 2 without the color reflection layer 5. That is, pixel separation is performed using the pixel electrodes 6 formed in a matrix. Accordingly, in this embodiment of the active matrix type, the pixel electrode 6 is formed on the substrate 2 on the incident side to perform pixel separation, while the substrate 1 on the reflection side is one quarter of the counter electrode 8 and the color reflection layer 5. The wavelength plate layer 4 is entirely formed. An advantage of this structure is that a driving substrate of a normal transmission type active matrix display device can be used as it is as the incident side substrate 2. Since the color reflection layer 5 and the quarter-wave plate layer 4 may be formed only on the counter substrate side, the equipment is simplified. By bonding the opposing substrate 1 and the driving substrate 2 and enclosing the guest host liquid crystal 3 in the gap between them, the color reflection type guest host liquid crystal display device is assembled. Note that the present invention is not limited to this, and the substrate on which the thin film transistor 11 and the pixel electrode 6 are formed may be the reflection side, and the substrate 1 on which the counter electrode 8 is formed may be the incident side. However, in this case, the quarter-wave plate layer 4 must be formed on the pixel electrode 6 side. In this case, the quarter-wave plate layer 4 is interposed between the pixel electrode 6 and the thin film transistor 11, and it is necessary to open a contact hole in the quarter-wave plate layer. Therefore, the manufacturing process is somewhat complicated.

Next, the operation of the color reflection type guest-host liquid crystal display device will be described with reference to FIG. The incident light that has passed through the effective aperture of the pixel electrode 6 enters the guest-host liquid crystal 3 containing the dichroic dye 10. Dichroic dye 10
Are horizontally oriented. The vibration component of the incident light parallel to the major axis of the molecule of the dichroic dye 10 is absorbed by the dichroic dye 10. On the other hand, a vibration component orthogonal to the long axis of the molecule of the dichroic dye 10 passes through the guest-host liquid crystal 3 without being absorbed,
It reaches the quarter-wave plate layer 4. After that, the light is selectively reflected by the color reflection layer 5, passes through the quarter-wave plate layer 4 again, and returns to the layer of the guest-host liquid crystal 3. At this point, the direction of oscillation of the reflected light is 90 ° due to the action of the quarter-wave plate layer 4.
Rotate. The rotated vibration direction coincides with the major axis direction of the molecules of the dichroic dye 10 and is absorbed. Thereby, a black display is obtained. On the other hand, when the orientation state of the guest-host liquid crystal 3 is switched from the horizontal orientation to the vertical orientation, the dichroic dye 10 is also vertically oriented accordingly. In this case, the incident light is wavelength-selectively reflected by the color reflection layer 5 for each pixel without being absorbed by the guest-host liquid crystal 3 or affected by the quarter-wave plate layer 4. Thereby, a desired full-color display can be obtained.

FIG. 2 is a schematic partial sectional view showing a second embodiment of the color reflection type guest-host liquid crystal display device according to the present invention. Basically, it is the same as the first embodiment shown in FIG. 1, and the corresponding parts are denoted by the corresponding reference numerals to facilitate understanding. The different point is that the color reflection layer 5 is formed of a translucent colored film 5c which is formed for each pixel along the light diffusive reflection surface 5b of the substrate 1 located on the reflection side. It has the nature. That is, in the present embodiment, the substrate 1 is made of a ceramic or the like, and the surface thereof is originally a light diffusing reflective surface 5b. Using this as it is, a translucent colored film 5c is formed on the reflection surface 5b. The color reflection layer 5 can be easily obtained by combining the reflection surface 5b and the colored film 5c. As the coloring film 5c, for example, a color photoresist in which an RGB dye or pigment is dispersed can be used. Since the color photoresist can be easily patterned by exposure and development, the colored film 5c partitioned into RGB can be easily formed. In some cases, if a fluorescent substance is contained in the colored film 5c, a reflective guest-host liquid crystal display device with higher luminance can be obtained.

FIG. 3 is a schematic partial sectional view showing a third embodiment of the color reflection type guest-host liquid crystal display device according to the present invention. Basically, it has the same structure as that of the first embodiment shown in FIG. 1, and corresponding parts are denoted by corresponding reference numerals to facilitate understanding. In this embodiment, the color reflection layer 5 has a laminated structure of the reflection layer 5c, the scattering layer 5d, and the coloring film 5e. The reflection layer 5c is made of, for example, an aluminum deposition film and has a mirror surface. The scattering layer 5d is an optical film in which transparent fine particles are dispersed in a transparent resin. The refractive indices of the transparent resin and the transparent fine particles are greatly different, and have excellent light diffusing properties with respect to incident light and reflected light.
The coloring film 5e has the same structure as a micro color filter used in a color transmission type guest-host liquid crystal display device, and is colored RGB for each pixel.

FIG. 4 is a schematic partial sectional view showing a fourth embodiment of the color reflection type guest-host liquid crystal display device according to the present invention. Parts corresponding to those in the first embodiment shown in FIG. 1 are denoted by corresponding reference numerals to facilitate understanding. In the present embodiment, the color reflection layer 5 is the substrate 1 on the reflection side.
The wavelength selectivity 51 for the incident light changes in accordance with the control voltage supplied from the substrate 1 and is divided into a plurality of colored states in one pixel. Present. The wavelength selection element 51 includes an optical cell 52 having a parallel plate electrode structure. When the cell gap changes according to the control voltage, the wavelength selectivity for incident light passing through the optical cell 52 changes. Thus, for example, RGB wavelength components can be selected within one pixel. The optical cell 52 is a cavity provided for each pixel.
And parallel plate-type control electrodes 53 and 5 on both sides thereof.
4 are provided. One control electrode 53 is divided for each pixel, and is provided in the surface of the substrate 1. For example, a desired control electrode 53 can be obtained by using a silicon wafer as the substrate 1 and selectively implanting impurities into the surface thereof. The cavity of the optical cell 52 has a deformable planarizing film 5.
5. The other control electrode 54 is solidly patterned on the flattening film 55. When a voltage is applied between the pair of parallel-plate control electrodes 53 and 54, a bending deformation occurs due to an electrostatic attraction between the two, and the cell gap of the cavity changes. Therefore, the wavelength selectivity due to multiple reflection in the cell 52 changes according to the cell gap. Therefore, the wavelength of the reflected light can be selected according to the control voltage. The color reflection layer 5 and the quarter-wave plate layer 4 composed of such a wavelength selection element 51 are provided with an intermediate glass plate 56.
Are separated from each other. As described above, in the present embodiment, a dynamically changing wavelength selection element 51 is used instead of a fixed color filter as the color reflection layer 5.
By changing the control voltage within one pixel, RG
It is possible to selectively output the three colors B. Therefore, instead of forming one pixel with three dots as in the first to third embodiments, it is possible to output three colors with one pixel.

[0017]

As described above, according to the present invention,
By using a color reflection layer in which a reflection plate layer and a color filter layer are integrated in a color reflection type guest-host liquid crystal display device, it becomes possible to greatly improve the utilization efficiency of incident light. Therefore, a bright screen with good contrast can be realized.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a first embodiment of a color reflection type guest-host liquid crystal display device according to the present invention.

FIG. 2 is a partial sectional view showing a second embodiment.

FIG. 3 is a partial sectional view showing a third embodiment.

FIG. 4 is a partial cross-sectional view showing a fourth embodiment.

FIG. 5 is a partial sectional view showing an example of a conventional reflection type guest-host liquid crystal display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Substrate, 2 ... Substrate, 3 ... Guest host liquid crystal, 4 ... Quarter wave plate layer, 5 ... Color reflective layer, 6 ... Pixel electrode, 8 ...
Counter electrode, 10: dichroic dye, 11: thin film transistor

Claims (9)

[Claims] An electrode having a predetermined pattern formed on an incident side; and an electrode having a predetermined pattern formed on a reflection side, wherein the one substrate is interposed with a gap. The other substrate that defines a matrix pixel between the two electrodes that are joined and facing each other, the guest-host liquid crystal that contains a dichroic dye and is held in the gap, and the other substrate that is positioned on the reflection side. A quarter-wave plate layer interposed between the guest-host liquid crystal and a quarter-wave plate layer between the reflection-side substrate and the quarter-wave plate layer;
A color reflection type guest-host liquid crystal display device comprising: a color reflection layer that selectively reflects the wavelength of incident light passing through the quarter-wave plate layer on a pixel-by-pixel basis to enable color display. 2. A plurality of pixel electrodes patterned in a matrix and switching elements for individually driving the pixel electrodes are integrated on the one substrate located on the incident side.
2. The color reflection device according to claim 1, wherein a solid pattern counter electrode is formed on the other substrate located on the reflection side, and an active matrix type pixel is defined between the pixel electrode and the counter electrode facing each other. Type guest host liquid crystal display device. 3. The color reflection layer is made of a reflective colored coating formed by partitioning each pixel along the surface of the other substrate located on the reflection side, and has a different wavelength selectivity for each partition. The color reflection type guest-host liquid crystal display device according to claim 1. 4. The color reflection layer is formed of a translucent colored film that is formed for each pixel along the light-diffusing reflection surface of the other substrate located on the reflection side, and has a different wavelength for each of the sections. 2. The color reflection type guest-host liquid crystal display device according to claim 1, which has selectivity. 5. The color reflection type guest-host liquid crystal display device according to claim 1, wherein the color reflection layer is integrally formed as at least a part of the surface of the other substrate located on the reflection side. 6. The color reflection type guest-host liquid crystal display device according to claim 1, wherein the color reflection layer contains a fluorescent substance. 7. The color reflection layer includes a wavelength selection element formed for each pixel along the surface of the other substrate located on the reflection side, and a control voltage supplied from the other substrate. 2. The color reflection type guest-host liquid crystal display device according to claim 1, wherein the wavelength selectivity with respect to the incident light changes in accordance with the condition, and one pixel exhibits a plurality of colored states. 8. The wavelength selection element according to claim 7, wherein the wavelength selection element comprises an optical cell having a parallel plate electrode structure, and when the cell gap changes according to a control voltage, the wavelength selectivity for incident light passing through the optical cell changes. Color reflective guest-host liquid crystal display. 9. The color reflection type guest-host liquid crystal display device according to claim 1, wherein the other substrate located on the reflection side is made of a material selected from glass, quartz, ceramic, plastic and metal.