JP3144466B2 - Reflective display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a reflective display device capable of color display.

[0002]

2. Description of the Related Art A reflection type display device performs display by using reflection of external light. This is roughly divided into visible light and light depending on the presence or absence of external stimulus such as voltage. A state in which light in a part of the wavelength region is reflected and light in another wavelength region is transmitted (hereinafter, referred to as a light reflection state), and a state in which light in the entire wavelength region in visible light is transmitted (hereinafter, light transmission) Using a light-reflective display that can take the
Similarly, depending on the presence or absence or degree of external stimulus, a state in which light in a part of the wavelength region in visible light is absorbed and light in other wavelength regions is transmitted (hereinafter, referred to as a light absorption state), A state in which light in all wavelength regions in light is transmitted (light transmission state)
There is a method using a light-absorbing display that can take the following.

As a light-reflective display, for example, a liquid crystal resin composite in which a liquid crystal and a polymer material are alternately formed in layers as disclosed in Japanese Patent Application Laid-Open No. 6-294952 is known. According to this, a high contrast can be obtained.

FIG. 14 shows an example of a reflection type display device disclosed in Japanese Patent Application Laid-Open No. 6-294952, in which a support plate 11 having a transparent electrode 41 formed on the inner surface and a transparent electrode 42 formed on the inner surface are formed. The liquid crystal resin composite 60 is sandwiched between the light absorbing layer 25 and the supporting plate 12.

The liquid crystal resin composite 60 is formed by alternately forming a liquid crystal and a polymer material in layers in a direction perpendicular to the plate surfaces of the support plates 11 and 12. Due to the difference in the rate, the light of a specific wavelength region in the incident light is reflected and the light of another wavelength region is transmitted according to the principle of the interference filter.

[0006] Since the refractive index of the liquid crystal is changed by the voltage applied between the transparent electrodes 41 and 42, the applied voltage is controlled to change the light transmission state in which the light of the entire wavelength region in the incident light is transmitted. As described above, it is possible to make a transition to a light reflection state in which light in a specific wavelength region is reflected and light in another wavelength region is transmitted, and the reflectance can be changed.

In the example shown in FIG. 14, the liquid crystal resin composite 60 is divided into three display regions having different layer pitches of liquid crystal and polymer material so that color display is possible. In this case, the transparent electrodes 41 and 42 are also formed separately so that the reflectivity of the transparent electrodes 41 and 42 can be controlled independently.

One display pixel 200 is constituted by the three sub-pixels 201, 202, and 203 formed as described above, and the layer pitch of the liquid crystal and the polymer material in the sub-pixels 201, 202, and 203 depends on the respective reflections. The wavelength region is, for example, a red wavelength region (600 to 700 nm),
It is set so as to have a green wavelength region (500 to 600 nm) and a blue wavelength region (400 to 500 nm).
An arbitrary display color can be obtained.

FIG. 16 shows the above-mentioned Japanese Patent Application Laid-Open No. 6-294952.
In another example of the reflection-type display device disclosed in
A display panel 71 having a liquid crystal resin composite 61 interposed between the support plates 13 and 14, a display panel 72 having a liquid crystal resin composite 62 interposed between the support plates 13 and 14, and a liquid crystal resin composite 63 between the support plates 15 and 16. The sandwiched display panel 73 is laminated.

The liquid crystal resin composites 61, 62, and 63 have red, green, and blue wavelength regions as reflection wavelength regions, respectively.
Transparent electrodes 41 and 42 are provided for each so that the reflectance can be controlled independently. Therefore, FIG.
As in the reflective display device of No. 4, an arbitrary display color can be obtained by additive color mixing.

On the other hand, as a light absorption type display, a liquid crystal containing a dichroic dye, a so-called guest-host liquid crystal, and the like are known. The reflective display device used is shown.

FIG. 18 shows a reflection type display device disclosed in Japanese Patent Publication No. Hei 3-501064, in which a support plate 11 having a transparent electrode 41 formed on the inner surface and transparent electrodes 42 and 43 on one and the other surface. And a support plate 13 having a transparent electrode 44 formed on the inner surface and a light reflection layer 20 formed on the outer surface. A guest host liquid crystal is provided between the support plate 11 and the support plate 12. The display bodies 64 and 65 are separated from each other by a partition wall 81 and sandwiched therebetween, and the display bodies 66 and 67 made of guest-host liquid crystal are separated from each other by a partition wall 82 between the support plate 12 and the support plate 13. , Which are pinched.

One display pixel 200 has three sub-pixels 2
01, 202, and 203, and one sub-pixel is formed by laminating two display members, respectively. However, the display members 64 and 67 have an area twice as large as the display members 65 and 66 and are mutually A half area is overlapped, and the display body 65 is overlapped with the display body 67, and the display body 66 is overlapped with the display body 64.

Then, the transparent electrodes 41, 4 can be driven independently of each other by half the area of the display bodies 64, 67, and the display bodies 65, 66 can be driven independently.
2, 43, and 44 are provided separately for each of the sub-pixels 201, 202, and 203.

For example, a guest-host liquid crystal that transmits only red light as the display 64, a guest-host liquid crystal that transmits only blue light as the displays 65 and 66, and a guest that transmits only green light as the display 67. A host liquid crystal is used for each.

In this case, when displaying red, the display bodies 64 and 65 are in the light absorbing state, the display body 66 is in the light transmitting state, the portion of the display body 67 overlapping the display body 64 is in the light transmitting state, A portion overlapping the display body 67 is set to a light absorbing state. At this time, the sub-pixels 201 and 20
2 is displayed in red, and the sub-pixel 203 is displayed in black. The same applies when displaying green or blue.

To display yellow, the portion of the display 64 overlapping the display 66 is in a light absorbing state, and the portion of the display 64 overlapping the display 67 is in a light transmitting state.
Is in a light absorbing state, the display 66 is in a light transmitting state, and the display 67 is in a light absorbing state. At this time, the sub-pixel 201 is displayed in red, the sub-pixel 202 is displayed in green, and the sub-pixel 203 is displayed in black. The same applies when displaying magenta or cyan.

When displaying white, the display bodies 64 to 6
If all 7 are in a light transmitting state and display black,
The display bodies 64 to 67 are all in a light absorbing state.

[0019]

However, FIG.
The conventional reflective display device described in (1) has a drawback that, because the brightness of the display is low, the display looks dark and gray in white display. FIG. 15 (A) (B) (C)
(D) shows the reflection type display device of FIG.
4 shows a schematic reflection spectrum when displaying red, yellow, and white.

That is, in the reflection type display device shown in FIG.
When displaying red, it is the display pixel 2 that reflects the red light.
Since only the sub-pixel 201 in 00 is shown, the spectral reflectance is only 33% at the maximum as shown in FIG.
Therefore, even though it is red, it looks only extremely dark red. For green and blue, too, they only look very dark.

In the case of displaying yellow, only the sub-pixel 201 reflects red light and only the sub-pixel 202 reflects green light.
As shown in (C), the spectral reflectance is only 33% at the maximum. Therefore, even though it is yellow, it looks only extremely dark yellow. Similarly, magenta and cyan only look very dark.

When displaying white, as shown in FIG. 15 (D), the white display looks gray because the spectral reflectance is only 33% at the maximum.

On the other hand, in the conventional reflection type display device shown in FIG. 16, the above problem does not occur at least in principle. FIGS. 17 (A), (B), (C), and (D) show FIG.
6 shows a schematic reflection spectrum at the time of displaying black, red, yellow, and white, respectively, of the reflective display device No. 6;

That is, in the reflection type display device of FIG.
In all cases of red, yellow, and white display, the spectral reflectance is ideally 100%, and vivid color display and bright white display can be performed. Further, since the area is not divided for color display, the resolution can be tripled as compared with the reflection type display device of FIG.

However, in the reflection type display device shown in FIG. 16, the display bodies 61 to 63 of each layer are separated by the support plates 12 to 15, and when viewed from an oblique direction, the display bodies 61 to 63 are displayed.
However, since the image of the image No. 3 looks displaced due to parallax, there is a disadvantage that the resolution cannot be increased so much in practice.

In general, when a display is driven by an active element such as a thin film transistor, the aperture ratio per display panel is reduced due to the presence of wiring and the like.
In the reflective display device of No. 6, since the display bodies 61 to 63 of each layer are separated by the support plates 12 to 15, the transmittance of the stacked display panels 71 to 73 is equal to the cube of the aperture ratio per panel. Decrease in proportion to the actual value,
There is the disadvantage of much lower reflectivity.

Further, the reflection type display device shown in FIG. 16 increases the weight due to the large number of support plates, makes it difficult to drive the intermediate display panel 72, and complicates the manufacturing process.
There are drawbacks such as.

FIGS. 19A, 19B, 19C, and 19D are diagrams of FIG.
8 shows a schematic reflection spectrum at the time of displaying black, red, yellow, and white, respectively, of the reflective display device of No. 8;

In the reflective display device shown in FIG. 18, when displaying red, the sub-pixels 201 and 202 are displayed in red, so that the area ratio is 67% at maximum, and FIG.
As shown in (B), the spectral reflectance is 67% at the maximum. This value corresponds to the value shown in FIG.
33% shown in FIG. 17 and FIG. 17 of the reflective display device of FIG.
Although it is an intermediate value from 100% shown in (B), the displayed red color looks relatively bright, and there is no problem in practical use.

Similarly, bright colors can be obtained for green and blue. When displaying white, FIG.
As shown in (D), the spectral reflectance becomes 100%, and a bright white color is displayed.

However, when displaying yellow,
Since only the sub-pixel 201 reflects red light and only the sub-pixel 202 reflects green light, the spectral reflectance is 33% as shown in FIG. 19C.
This value is the same as the value shown in FIG. 15C of the reflective display device in FIG. 14, and therefore, even though it is yellow, it looks only extremely dark yellow. Similarly, magenta and cyan only look very dark.

The reflection type display device shown in FIG. 18 has one less display panel than the reflection type display device shown in FIG. 16, so that the reflectance is reduced due to the aperture ratio when the display is driven by active elements. Can be reduced. Also, parallax due to the display members of each layer being separated by the support plate can be reduced.

However, since the light reflecting layer 20 is provided separately from the display bodies 64 to 67 and the display bodies 64 to 67 are separated from each other, a parallax is generated, so that the parallax is not so small as a whole. Further, a light-absorptive display such as a guest-host liquid crystal does not provide sufficient contrast in practice, and thus has the disadvantage that a vivid color display cannot be obtained.

Therefore, the present invention provides a reflective display device capable of color display, in which parallax is reduced and
It is intended to enable bright and vivid color display.

[0035]

In a reflection type display device according to the present invention, a plurality of display pixels are arranged in a plane, and the display pixels are arranged by first, second and third sub-pixels which are respectively juxtaposed. And the first, second, and third sub-pixels are respectively constituted by stacked first-layer and second-layer displays, and each of the displays has presence or absence or degree of external stimulus. A display body that can take a state of reflecting light in a part of the wavelength region in visible light and transmitting light in other wavelength regions and a state of transmitting light in the entire wavelength region of visible light according to And the first, second and third
The reflection wavelength regions of the display of the first layer of the sub-pixels are red, green, and blue wavelength regions, respectively.
The reflection wavelength regions of the display body of the second layer of the sub-pixel are blue, red, and green wavelength regions, respectively.

[0036]

According to the reflective display device of the present invention having the above-described structure, it is possible to display eight colors of red, green, blue, cyan, magenta, yellow, white and black.

Each of the sub-pixels is composed of two stacked sub-pixels.
Since it is composed of one display body, the spectral reflectance is higher than that of the conventional reflection type display device of FIG. 14, and a vivid color display and a bright white display can be achieved.

Further, since the display is laminated in two layers, the parallax due to the separation of the display of each layer is reduced as compared with the conventional reflection type display device of FIG. Further, since the light-reflective display is used and the light-reflective layer is not used, there is no parallax due to the separation of the light-reflective layer and the display, and as a whole, compared with the conventional reflective display of FIG. Parallax is greatly reduced.

Further, since a light-reflective display such as a liquid crystal resin composite in which a liquid crystal and a polymer material are alternately formed in layers is used, the conventional reflection-type display shown in FIG. Higher contrast can be obtained.
Therefore, bright and vivid color display is possible.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIGS. 1 and 2 FIG. 1 shows an example of a reflective display device according to the present invention, and is an example of the first aspect of the present invention.

In the reflection type display device of this example, the display bodies 51, 52, 53 are provided between the support plate 11 having the transparent electrode 41 formed on the inner surface and the support plate 12 having the transparent electrode 42 formed on the inner surface.
Between the support plate 13 having the transparent electrode 43 formed on the inner surface and the support plate 14 having the transparent electrode 44 formed on the inner surface and the light absorbing layer 25 formed on the outer surface. The display cells 51, 52, 53 are stacked on the display cells 151, 52, 53 side and the display cells 152 on the display bodies 54, 55, 56 side.

Each of the display bodies 51 to 56 has a light in a partial wavelength range in the visible light according to the presence or absence or degree of external stimulation such as voltage or current, magnetism, light, heat, and pressure. Reflecting light and transmitting light in other wavelength ranges,
That is, a light-reflecting type, which can take any of a light-reflecting state and a state of transmitting light in the entire wavelength region of visible light, that is, a light-transmitting state, for example, a liquid crystal and a polymer material are supported on the support plate 11. Liquid crystal resin composites alternately formed in layers in a direction perpendicular to the plate surface of Nos. 1 to 14, or cholesteric liquid crystals which are planar aligned are used.

One display pixel 200 includes three sub-pixels 2
01, 202, and 203, and each sub-pixel has a structure in which two display bodies are stacked. That is,
The sub-pixel 201 is formed by the display bodies 51 and 54, and the sub-pixel 202 is formed by the display bodies 52 and 55.
Are constituted by display bodies 53 and 56, respectively.
The transparent electrodes 41, 42, 43 and 44 are connected to the sub-pixels 20 so that the display bodies 51 to 56 can be independently driven.
1, 202, and 203 are provided separately.

For example, the display bodies 51 and 55 are those that reflect red light, the display bodies 52 and 56 are those that reflect green light, and the display bodies 53 and 54 are those that reflect blue light. Is used.

In this case, when displaying red, the display bodies 51, 55 are in a light reflecting state, and the display bodies 52, 53, 5 are displayed.
4, 56 are in a light transmitting state. At this time, the sub-pixel 201
And 202 are displayed in red, and the sub-pixel 203 is displayed in black. The same applies when displaying green or blue.

In the case of displaying yellow, the display bodies 51 and 5
5, 52 and 56 are in a light reflecting state, and the display bodies 53 and 54 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in red, the sub-pixel 202 is displayed in yellow, and the sub-pixel 203 is displayed.
Is displayed in green. The same applies when displaying magenta or cyan.

When displaying white, the display members 51 to 5
When all 6 are in a light reflecting state and display black,
The display bodies 51 to 56 are all in a light transmitting state.

FIGS. 2A, 2B, 2C, and 2D show schematic reflection spectra of the reflective display device of FIG. 1 when displaying black, red, yellow, and white, respectively.

When displaying red, the red pixels are reflected by the sub-pixels 201 and 202 in the display pixel 200, and the area ratio thereof is 67% at the maximum.
As shown in FIG. 1, the spectral reflectance is 67% at the maximum, and FIG.
8 and a bright and vivid color equivalent to that of the reflective display device of No. 8 can be obtained. Similarly, bright and vivid colors can be obtained for green and blue.

In the case of displaying yellow, as shown in FIG. 2C, the spectral reflectance is 67% at the maximum, and a bright and vivid color having a spectral reflectance twice that of the reflective display device of FIG. Color is obtained. Similarly, bright and vivid colors can be obtained for magenta and cyan.

Also when displaying white, as shown in FIG. 2D, the spectral reflectance is 67% at the maximum, and a relatively bright white display can be obtained.

As described above, according to the example of FIG. 1, when red, green, blue, yellow, magenta, cyan, and white are displayed, the spectral reflectance is 67% at the maximum, so that a well-balanced and bright color is displayed. Display becomes possible.

Further, since the display is laminated in two layers, the parallax due to the separation of the display of each layer is reduced as compared with the conventional reflection type display of FIG. Further, since the light-reflective display is used and the light-reflective layer is not used, there is no parallax due to the separation of the light-reflective layer and the display, and as a whole, compared with the conventional reflective display of FIG. Parallax is greatly reduced.

An example of a method of manufacturing the reflection type display device shown in FIG. 1 will be described. First, ITO, SiO ₂ , Zn are applied to support plates 11, 12, 13, 14 made of a transparent insulator such as glass, acrylic resin, polycarbonate resin, or the like.
0: A transparent conductive material such as Al is deposited and photo-etched to form transparent electrodes 41, 42, 43 and 44.

Next, a seal pattern having an opening at one end is formed around the support plate 11, and then a resin spacer having a diameter of 10 μm is sprayed, and the support plate 11 is bonded to the support plate 12 to produce a cell 151. . Similarly, the support plate 13 and the support plate 14 are attached to each other to form the cell 152.

Next, a liquid mixture of the photocurable resin and the liquid crystal is vacuum-injected into the cells 151 and 152. The photocurable resin is a mixture mainly composed of a radical polymerizable monomer such as acrylic, epoxy, urethane and the like, and a photopolymerization initiator such as benzyl, benzophenone and Michler's ketone, and is a resin polymerized by visible light. As liquid crystals, cyanobiphenyl group, phenylbenzoate group, azobenzene group,
A rod-shaped low-molecular liquid crystal material having a phenylcyclohexyl group or the like in its skeleton can be used.

Next, as shown in FIG.
Photomasks 161 and 162 are arranged on both sides of 152,
Argon ion laser beams 101 and 102 having a wavelength of 488 nm are irradiated from both surfaces of the cells 151 and 152 so as to form an angle θ with respect to the plate surface of the support plate.

As a result, interference fringes of the laser beams 101 and 102 are formed inside the mixed liquid of the photo-curable resin and the liquid crystal, and the polymerization reaction of the photo-curable resin proceeds in a bright portion of the interference fringes, so A structure is formed in which molecules and liquid crystal are phase-separated in layers. However, here, it is essential that a layered structure is formed, and the presence or absence of phase separation is not essential. A liquid crystal polymer gel in which a polymerized polymer chain swells in a gel state with liquid crystal may be used.

The layer pitch between the polymer and the liquid crystal can be changed by the incident angle θ of the laser beams 101 and 102. Therefore, the positions of the photomasks 161 and 162 are shifted, and the angles of incidence θ of the laser beams 101 and 102 are changed, and the laser beams 101 and 102 are irradiated three times in total, so that the red, green and blue wavelengths are respectively obtained. It is possible to form three types of display bodies whose regions are reflection wavelength regions.

More specifically, for the cell 151, the first time, only the portion corresponding to the display body 53 is irradiated with laser light at θ = 0 ° to form the display body 53 that reflects blue light. By irradiating a laser beam only at a portion corresponding to the display body 52 at θ = 27 °, a display body 52 that reflects green light is formed.
In the third time, only the portion corresponding to the display body 51 is irradiated with laser light at θ = 39 ° to form the display body 51 that reflects red light. Similarly, for the cell 152, the display bodies 54, 56, and 55 that reflect blue light, green light, and red light, respectively.
Are sequentially formed.

Finally, the cell 151 and the cell 152 are bonded with an optical adhesive, and a black resin is applied as a light absorbing layer 25 on the back surface of the cell 152 to obtain the reflection type display device shown in FIG.

[0062]

Embodiment 2 FIGS. 3 and 4 FIG. 3 shows another example of the reflection type display device of the present invention, and is an example of the second aspect of the present invention.

That is, this example is different from the example of FIG.
The display body 51 reflects the red light, the display body 52 reflects the green light, and the display body 53 reflects the blue light, respectively, and the two stacked display bodies reflect the color lights that are complementary to each other. In this case, the display 54 reflects cyan light, the display 55 reflects magenta light, and the display 56 reflects yellow light.

In this example, when displaying red, the display 51 is in a light reflecting state, and the displays 52 to 56 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in red, and the sub-pixels 202 and 203 are displayed in black. The same applies when displaying green or blue.

When displaying yellow, the display bodies 51 and 5
2 and 56 are in a light reflecting state, and the display bodies 53, 54 and 55 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in red, the sub-pixel 202 is displayed in green, and the sub-pixel 203 is displayed.
Is displayed in yellow. The same applies when displaying magenta or cyan.

When displaying white, the display bodies 51 to 5
When all 6 are in a light reflecting state and display black,
The display bodies 51 to 56 are all in a light transmitting state.

FIGS. 4A, 4B, 4C, and 4D show schematic reflection spectra of the reflection type display device of FIG. 3 when displaying black, red, yellow, and white, respectively.

In the case of displaying yellow, as shown in FIG. 4C, the spectral reflectance is 67% at the maximum, and a bright and vivid color is obtained as in the example of FIG. The same applies to magenta and cyan.

In the case of displaying white, as shown in FIG. 4D, the spectral reflectance becomes 100%, and a white color brighter than the example of FIG. 1 is displayed.

On the other hand, when displaying red,
The sub-pixel 201 in the display pixel 200 reflects the red light.
Therefore, as shown in FIG. 4B, the spectral reflectance is only 33% at the maximum, and a dark display is obtained. The same applies to green and blue. However, generally red,
Since green and blue have high saturation, they look relatively vivid even if the spectral reflectance is low.

Therefore, the spectral reflectance of red, green and blue is 67%, and the spectral reflectance of yellow, magenta and cyan is 3%.
Compared with the reflective display device of FIG. 18 which is 3%, the example of FIG. 3 in which the spectral reflectance of red, green and blue is 33% and the spectral reflectance of yellow, magenta and cyan is 67%. The overall image quality is excellent.

An example of a method of manufacturing the reflection type display device of the example shown in FIG. 3 will be described. Since the basic manufacturing method is the same as in Example 1,
A cell 15 including display elements 54, 55, and 56 that reflect different portions, that is, cyan, magenta, and yellow color light.
2 is shown.

First, in the same manner as in Example 1, a cell 152 into which a liquid mixture of a photocurable resin and a liquid crystal is injected is manufactured. However, a sensitizing dye such as rose bengal or methylene blue is added to the photocurable resin so that the light receiving sensitivity is in the visible light region (400 to 700 nm).

Next, as shown in FIG. 13, photomasks 161 and 162 are arranged on both sides of the cell
The laser beams 101 and 102 are emitted from both sides of the support plate 2 so as to form an angle θ with respect to the plate surface of the support plate. However, in this case, three types of laser beams having different wavelengths are sequentially irradiated with θ = 0 °.

More specifically, for the cell 152, the first time the Ar having a wavelength of 488 nm is applied to a portion corresponding to the display members 54 and 55.
And irradiating a portion corresponding to the display bodies 54 and 56 with Ar + laser light having a wavelength of 515 nm for the second time,
The third time, the wavelength 633 is added to the portion corresponding to the display bodies 55 and 56.
The display bodies 54, 55, and 56 that reflect cyan, magenta, and yellow color lights are formed by irradiating He—Ne laser light of nm.

The display bodies 51, 52, 5 of the cell 151
3 respectively reflect cyan, magenta and yellow color light, and the display members 54, 55 and 56 of the cell 152 are
Red, green, and blue color lights may be respectively reflected. The display 51 reflects cyan, the display 52 displays green, the display 53 displays yellow, the display 54 displays red, the display 55 displays magenta, and the display 56 displays blue light. It may be.

Embodiment 3 FIGS. 5 and 6 FIG. 5 shows another example of the reflection type display device of the present invention, and is an example of the fourth aspect of the present invention.

In this example, two display bodies 51 and 52 are sandwiched between the support plates 11 and 12 in a planar manner.
The two display bodies 53 and 54 are sandwiched between the support plates 13 and 14 in a planar manner, and the display cells 15 and 52 on the display bodies 51 and 52 side are sandwiched.
1 and the display cells 152 of the display bodies 53 and 54 are stacked.

That is, one display pixel 200 is constituted by two sub-pixels 201 and 202, and each sub-pixel has a structure in which two display bodies are stacked. Display body 5
The transparent electrodes 41, 42, 43, and 44 are provided separately for each of the sub-pixels 201 and 202 so that the sub-pixels 201 to 202 can be driven independently.

As described above, in this example, one display pixel 2
Since 00 is composed of two sub-pixels 201 and 202, the resolution can be higher than that of the first and second embodiments.

Then, for example, those that reflect red light are used as the display bodies 51 and 52, those that reflect green light are used as the display body 53, and those that reflect blue light are used as the display body 54.

In this example, when displaying red, the display bodies 51 and 52 are in a light reflecting state, and the display bodies 53 and 54 are in a light transmitting state. At this time, the sub-pixels 201 and 202 are displayed in red.

When displaying green, the display members 51 and 5
2 is in a light transmitting state, the display 53 is in a light reflecting state, and the display 54 is in a light transmitting state. At this time, the sub-pixel 201
Are displayed in green, and the sub-pixel 202 is displayed in black.
The same applies to the case of displaying blue.

When displaying yellow, the display bodies 51 and 5
3 is in a light reflecting state, and the display bodies 52 and 54 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in yellow, and the sub-pixel 202 is displayed in black.

When displaying magenta, the display 5
1 and 53 are in a light transmitting state, and the display bodies 52 and 54 are in a light reflecting state. At this time, the sub-pixel 201 is displayed in black, and the sub-pixel 202 is displayed in magenta.

When displaying cyan, the display body 51,
52 is in a light transmitting state, and the display bodies 53 and 54 are in a light reflecting state. At this time, the sub-pixel 201 is displayed in green, and the sub-pixel 202 is displayed in blue.

When displaying white, the display bodies 51 and 5
3 and 54 are in a light reflecting state, and the display body 52 is in a light transmitting state. When displaying black, all the display bodies 51 to 54 are in a light transmitting state.

FIGS. 6A, 6B, 6C and 6D show schematic reflection spectra of the reflection type display device of FIG. 5 when displaying black, red, yellow and white, respectively.

Red does not look vivid unless it has a higher spectral reflectance than green or blue. In this example, when displaying red, as shown in FIG. 6B, the spectral reflectance becomes 100% at the maximum, and an extremely bright and vivid display can be obtained.

When displaying green, blue, yellow, magenta, cyan, and white, the spectral reflectance is 50%, and a well-balanced, bright, and vivid display is obtained.

It should be noted that green light is used as the display members 51 and 52,
The one that reflects red light as the display body 53 and the one that reflects blue light as the display body 54 is used. The spectral reflectance of green is set to 100%, or blue light is used as the display bodies 51 and 52, and the display body 53 is used. The one that reflects green light and the one that reflects red light as the display body 54 may be used to make the blue spectral reflectance 100%.

Embodiment 4 FIGS. 7 and 8 FIG. 7 shows another example of the reflection type display device of the present invention, and is an example of the fifth aspect of the present invention.

This example is similar to the example of FIG.
Represents red light, the display 52 reflects blue light, and the display 53 reflects green light.
No. 4 is a case where yellow light is reflected so as to reflect color light having a complementary color relationship to the display body 52.

In this example, when displaying red, the display 51 is in a light reflecting state and the displays 52, 53, 54 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in red, and the sub-pixel 202 is displayed in black. The same applies when displaying green or blue.

When displaying yellow, the display bodies 51 and 5
3 and 54 are in a light reflecting state, and the display body 52 is in a light transmitting state. At this time, the sub-pixels 201 and 202 are displayed in yellow.

When displaying magenta, the display 5
1 and 52 are in a light reflecting state, and the display bodies 53 and 54 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in red, and the sub-pixel 202 is displayed in blue.

When displaying cyan, the display body 51,
54 is in a light transmitting state, and the display bodies 52 and 53 are in a light reflecting state. At this time, the sub-pixel 201 is displayed in green, and the sub-pixel 202 is displayed in blue.

When displaying white, the display members 51 to 5
If all 4 are in a light reflecting state and display black,
The displays 51 to 54 are all in a light transmitting state.

Also in this example, since one display pixel 200 is constituted by two sub-pixels 201 and 202, the resolution can be higher than that of the first and second embodiments.

FIGS. 8A, 8B, 8C and 8D show schematic reflection spectra of the reflection type display device of FIG. 5 when displaying red, magenta, yellow and white, respectively.

Yellow does not look bright unless the spectral reflectance is higher than magenta or cyan. In this example,
In the case of displaying yellow, as shown in FIG. 8C, the spectral reflectance becomes 100% at the maximum, and an extremely bright and vivid display can be obtained.

When displaying red, the sub-pixel 201 is displayed in red and its area ratio is 50% at the maximum, so that the spectral reflectance is 50% at the maximum as shown in FIG.
%, And a relatively bright color can be obtained. Similarly, when displaying green, blue, magenta, and cyan, the spectral reflectance is 50% at the maximum and a relatively bright color is obtained.

When displaying white, as shown in FIG. 8 (D), the spectral reflectance in the blue wavelength region (0.4 to 0.5 μm) is only 50% and slightly yellowish. In other wavelength regions, the spectral reflectance becomes 100%, and an extremely bright display is obtained.

It is to be noted that the display member 51 reflects red light, the display member 52 reflects green light, the display member 53 reflects blue light, and the display member 54 reflects magenta light. To 100%, or
Reflecting green light as the display body 51, red light as the display body 52, blue light as the display body 53, and cyan light as the display body 54, the spectral reflectance of cyan is set to 100%. You can also.

In short, by using the display members 52 and 54 that reflect color light having a complementary color relationship to each other, an extremely bright white display can be obtained although coloring is slightly generated.

Embodiment 5 FIGS. 9 and 10 FIG. 9 shows another example of the reflection type display device of the present invention, and is an example of the third aspect of the present invention.

This example is similar to the example shown in FIG.
Is a red light, the display 52 reflects blue light, and the displays 53 and 54 reflect color lights that are complementary to the displays 51 and 52, respectively. Reference numeral 53 denotes a case where cyan light is reflected, and display 54 reflects yellow light.

In this example, when displaying red, the display 51 is in a light reflecting state and the displays 52, 53, 54 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in red, and the sub-pixel 202 is displayed in black.

When displaying green, the display bodies 53, 5
4 is in a light reflecting state, and the display bodies 51 and 52 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in cyan, and the sub-pixel 202 is displayed in yellow.

When displaying blue, the display 52 is in a light reflecting state and the displays 51, 53, 54 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in black, and the sub-pixel 202 is displayed in blue.

When displaying yellow, the display 54 is in a light reflecting state, and the displays 51, 52, 53 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in black, and the display body is displayed in yellow.

When displaying magenta, the display 5
1 and 52 are in a light reflecting state, and the display bodies 53 and 54 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in red, and the sub-pixel 202 is displayed in blue.

When cyan is to be displayed, the display 53 is in a light reflecting state, and the displays 51, 52, 54 are in a light transmitting state. At this time, the sub-pixel 201 is displayed in cyan,
The sub-pixel 202 is displayed in black.

When displaying white, the display bodies 51 to 5
If all 4 are in a light reflecting state and display black,
The displays 51 to 54 are all in a light transmitting state.

Also in this example, since one display pixel 200 is constituted by two sub-pixels 201 and 202, the resolution can be higher than that of the first and second embodiments.

FIGS. 10 (A), 10 (B), 10 (C), and 10 (D) show FIGS.
Green, red, yellow,
4 shows a schematic reflection spectrum when displaying white.

When displaying white, the spectral reflectance is 1
00%, which is superior to the example of FIG. 7 in that brighter white is displayed than in the examples of FIGS. 1 and 5 and no coloring occurs. When displaying red, blue, yellow, magenta, and cyan, the spectral reflectance is 50%, and a well-balanced, bright, and vivid display is obtained.

On the other hand, when displaying green,
Although red and blue are mixed and the saturation is low, the maximum value of the spectral reflectance is 100%, and bright green is displayed.

As the display members 51, 52, 53, and 54, those that reflect blue, green, yellow, and magenta light, or those that reflect green, red, magenta, and cyan light, respectively, are used. It can also be used.

Embodiment 6 FIGS. 11 and 12 FIG. 11 shows another example of the reflective display device of the present invention.
This is an example of the invention of claim 6.

In this example, four display bodies 51, 52, 53, and 54 are sandwiched between support plates 11 and 12 in a plane, and four display bodies 55 and 55 are provided between support plates 13 and 14.
56, 57, and 58 are arranged side by side and sandwiched, and the display body 5
This is the case where the display cells 151 on the 1-54 side and the display cells 152 on the display bodies 55-58 side are stacked.

That is, one display pixel 200 is constituted by four sub-pixels 201, 202, 203, and 204, and each sub-pixel has a structure in which two display bodies are stacked. The transparent electrodes 41, 42, 43, and 44 are provided separately for each of the sub-pixels 201, 202, 203, and 204 so that the display bodies 51 to 58 can be independently driven.

For example, the display bodies 51 and 56 emit red light, the display bodies 52 and 57 emit green light, and the display bodies 53 and 5 emit light.
5 and 58 reflect blue light, respectively, and the display body 54 reflects yellow light which is complementary to the display body 58 overlapping therewith.

In this example, when displaying red, the display bodies 51 and 56 are in a light reflecting state, and the display bodies 52, 53 and
54, 55, 57, and 58 are in a light transmitting state. At this time, the sub-pixels 201 and 202 are displayed in red, and the sub-pixel 2
03 and 204 are displayed in black.

When displaying green, the display bodies 52, 5
7 is in a light reflecting state, and the display bodies 51, 53, 54, 55,
56 and 58 are in a light transmitting state. At this time, the sub-pixel 20
1, 204 are displayed in black, and the sub-pixels 202, 203 are displayed in green.

When displaying blue, the display bodies 53, 5
5 and 58 are in a light reflecting state, and the display bodies 51, 52, 54,
56 and 57 are in a light transmitting state. At this time, the sub-pixel 20
1, 203, and 204 are displayed in blue, and the sub-pixel 202 is displayed.
Is displayed in black.

When displaying yellow, the display bodies 51 and 5
2, 54, 56, 57 are in a light reflecting state,
55 and 58 are in a light transmitting state. At this time, the sub-pixel 20
1 is displayed in red, the sub-pixels 202 and 204 are displayed in yellow, and the sub-pixel 203 is displayed in green.

When displaying magenta, the display 5
1, 53, 56, 58 are in a light reflecting state,
54, 55, and 57 are in a light transmitting state. At this time, the sub-pixels 201 and 202 are displayed in red, and the sub-pixels 203 and 2 are displayed.
04 is displayed in blue.

When cyan is displayed, the display 52,
55, 57, 58 are in a light reflecting state, and the display bodies 51, 5
3, 54, 56 are in a light transmitting state. At this time, the sub-pixels 201 and 204 are displayed in blue, and the sub-pixels 202 and 20 are displayed.
3 is displayed in green.

When displaying white, the display units 51 to 5
If all 8 are in the light reflecting state and display black,
The display bodies 51 to 58 are all in a light transmitting state.

FIGS. 12 (A), (B), (C) and (D) show FIG.
1 shows a schematic reflection spectrum of a reflective display device of one example when displaying red, blue, yellow, and white, respectively.

In the case of displaying yellow, as shown in FIG. 12C, the spectral reflectance becomes a high value of 75%,
A bright and vivid display can be obtained. Also in the case of displaying blue, which is a complementary color of yellow, as shown in FIG. 12B, the spectral reflectance has a high value of 75%.

When displaying white, FIG.
As shown in (D), the spectral reflectance is as high as 75% and is excellent in that no coloring occurs.

When displaying red, the sub-pixel 201,
202 is displayed in red, and its area ratio is 50% at the maximum. Therefore, as shown in FIG.
0%, and a relatively bright color is obtained. Also when displaying green, magenta, and cyan, the spectral reflectance is 50%, and a relatively bright color can be obtained.

It is to be noted that a material that reflects magenta light as the display body 54 and a light that reflects green light as the display body 58, respectively, or a cyan light as the display body 54 and a display body 58
The one that reflects red light can also be used.

[0137]

As described above, according to the present invention, not only parallax is reduced, but also bright and vivid color display becomes possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first example of a reflective display device of the present invention.

FIG. 2 is a diagram showing a schematic reflection spectrum at the time of displaying black, red, yellow, and white of the reflective display device of FIG. 1;

FIG. 3 is a sectional view showing a second example of the reflective display device of the present invention.

FIG. 4 is a diagram showing a schematic reflection spectrum at the time of displaying black, red, yellow, and white of the reflective display device of FIG. 3;

FIG. 5 is a sectional view showing a third example of the reflective display device of the present invention.

6 is a diagram showing a schematic reflection spectrum at the time of displaying black, red, yellow, and white of the reflective display device of FIG. 5;

FIG. 7 is a sectional view showing a fourth example of the reflective display device of the present invention.

8 is a diagram showing a schematic reflection spectrum of the reflective display device of FIG. 7 when displaying red, magenta, yellow, and white.

FIG. 9 is a sectional view showing a fifth example of the reflective display device of the present invention.

FIG. 10 shows the reflection type display device of FIG.
FIG. 4 is a diagram illustrating a schematic reflection spectrum when displaying white.

FIG. 11 is a sectional view showing a sixth example of the reflective display device of the present invention.

12 is a diagram showing a schematic reflection spectrum at the time of displaying red, blue, yellow, and white of the reflective display device of FIG. 11;

FIG. 13 is a diagram for explaining an example of the method of manufacturing the reflective display device of the present invention.

FIG. 14 is a cross-sectional view illustrating an example of a conventional reflective display device.

15 is a diagram showing a schematic reflection spectrum at the time of displaying black, red, yellow, and white of the reflective display device of FIG. 14;

FIG. 16 is a cross-sectional view showing another example of a conventional reflective display device.

17 is a diagram showing a schematic reflection spectrum at the time of displaying black, red, yellow, and white of the reflective display device of FIG. 16;

FIG. 18 is a cross-sectional view showing still another example of a conventional reflective display device.

19 is a diagram showing a schematic reflection spectrum at the time of displaying black, red, yellow, and white of the reflective display device of FIG. 18;

[Explanation of symbols]

11, 12, 13, 14 Support plate 41, 42, 43, 44 Transparent electrode 51, 52, 53, 54, 55, 56, 57, 58 Display body 25 Light absorbing layer 151, 152 Display cell 200 Display pixel 201, 202 , 203, 204 sub-pixel

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-294952 (JP, A) JP-A-9-68702 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1347 G02F 1/1335

Claims (6)

(57) [Claims] A plurality of display pixels are arranged in a plane, and the display pixels are arranged side by side.
, The first, second, and third sub-pixels are respectively formed by stacked first-layer and second-layer displays, and each of the displays is provided with an external stimulus. Depending on the presence or absence or degree of light, a state in which light in some wavelength regions in visible light is reflected and light in other wavelength regions is transmitted, and a state in which light in all wavelength regions in visible light is transmitted The first, second, and third sub-pixels have reflection wavelength regions of the first-layer display member, which are red, green, and blue wavelength regions, respectively.
A reflective display device, wherein the reflection wavelength regions of the display body of the second layer of the first, second, and third sub-pixels are blue, red, and green wavelength regions, respectively. 2. A display apparatus comprising: a plurality of display pixels arranged in a plane;
The first, second, and third sub-pixels are each composed of two stacked display bodies, and each of the display bodies is configured according to the presence or absence or degree of external stimulus. It is composed of a display body that can reflect light in a part of the wavelength region of visible light and transmit light in other wavelength regions, and can transmit light in the entire wavelength region of visible light. At the same time, the reflection wavelength regions of one of the first, second, and third sub-pixels are red, green, and blue wavelength regions, respectively, and the first, second, and third sub-pixels A reflection type display device in which the other display body has a reflection wavelength region of cyan, magenta, and yellow wavelength regions, respectively. 3. A plurality of display pixels are arranged in a plane, the display pixels are constituted by first and second sub-pixels juxtaposed respectively, and the first and second sub-pixels are respectively stacked. Done 2
The display body reflects light in a part of the wavelength region in visible light and transmits light in the other wavelength region according to the presence or absence or degree of external stimulus. State and a state in which light in the entire wavelength region of visible light can be transmitted, and the reflection wavelength region of one of the first and second sub-pixels is:
The wavelength ranges of the first and second colors of red, green, and blue are respectively set, and the reflection wavelength ranges of the other display bodies of the first and second sub-pixels are the first and second colors, respectively. A reflection type display device in which a wavelength region of a color having a complementary color relationship to the wavelength region is set. 4. A plurality of display pixels are arranged in a plane, the display pixels are constituted by first and second sub-pixels juxtaposed respectively, and the first and second sub-pixels are respectively stacked. Done 2
The display body reflects light in a part of the wavelength region in visible light and transmits light in the other wavelength region according to the presence or absence or degree of external stimulus. State and a state in which light in the entire wavelength region of visible light can be transmitted, and the reflection wavelength region of one of the first and second sub-pixels is:
The wavelength ranges of the first color of red, green, and blue are respectively set, and the reflection wavelength ranges of the other display bodies of the first and second sub-pixels are the second and third of the red, green, and blue, respectively. Third
Reflection type display device having a wavelength range of the color. 5. A plurality of display pixels are arranged in a plane, and the display pixels are constituted by first and second sub-pixels juxtaposed respectively, and the first and second sub-pixels are respectively stacked. Done 2
The display body reflects light in a part of the wavelength region in visible light and transmits light in the other wavelength region according to the presence or absence or degree of external stimulus. A first sub-pixel, one of the first sub-pixel, the other display, and a second sub-pixel. The reflection wavelength region of one of the display members is a wavelength region of a different color among red, green, and blue, respectively, and the reflection wavelength region of the other display member of the second sub-pixel is
A reflection type display device in which a wavelength region of a color having a complementary color relationship to a color of a reflection wavelength region of one display of the second sub-pixel is set. 6. A plurality of display pixels are arranged in a plane, and the display pixels are constituted by first, second, third, and fourth sub-pixels which are respectively juxtaposed, and the first, second, and The third and fourth sub-pixels are each composed of two stacked display elements, and each of the display elements has a partial wavelength range in visible light according to the presence or absence or degree of external stimulus. And a display body that can take a state of reflecting light of another wavelength region and a state of transmitting light of all wavelength regions in visible light, and a first, second, and second display member. The reflection wavelength regions of one display body of the three sub-pixels are red, green, and blue wavelength regions, respectively, and the reflection wavelength regions of the other display body of the first, second, and third sub-pixels are respectively Blue, red, and green wavelength regions
The reflection wavelength region of one of the display bodies of the sub-pixels is a wavelength region of any one of red, green, and blue.
A reflection type display device wherein the reflection wavelength region of the other display body of the sub-pixel is a wavelength region of a color complementary to the color of the reflection wavelength region of the one display body of the fourth sub-pixel.