JP2012220832A - Laminated type reflective display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated type reflective display panel in which quality of white display and black display is improved.SOLUTION: A laminated type reflective display panel comprises: a plurality of reflective display panels 10 which are laminated on top of each other; and a light absorbing layer 15 provided on a rear surface of the laminated plurality of the reflective display panels. Each of the reflective display panels includes: two substrates 11 and 12 arranged facing each other; two groups of transparent electrodes 13 and 14 formed on the opposing surfaces of the two substrates 11 and 12, respectively, so as to cross each other when viewed from a viewing direction; spacer members 30 formed in a grid-like manner so as to surround each of pixels defined as crossing portions of the two groups of the transparent electrodes, for regulating a distance between the two substrates; and a reflective material layer 17 sealed between the opposing two substrates and having a reflection state varying according to a voltage applied between the transparent electrodes. An aperture ratio regulated by the grid-like spacer members is different in at least one of the reflective display panels.

Description

  The present invention relates to a multilayer reflective display panel.

  In the future, it is expected that electronic paper capable of holding a display even without a power source and capable of electrically rewriting display contents will be rapidly spread. Electronic paper aims to realize ultra-low power consumption that enables memory display even when the power is turned off, a reflective display that is easy on the eyes and does not get tired, and a flexible and thin display body that is flexible like paper. Research is underway. Applications of electronic paper include electronic books, electronic newspapers, electronic posters, and the like.

  Electronic paper is classified into an electrophoresis method, a twist ball method, an electrochemical method, a liquid crystal display, an organic EL display, and the like depending on the display method. The electrophoresis method is a method in which charged particles are moved in air or liquid. The twist ball method is a method of rotating charged particles that are color-coded in two colors. The electrochemical method is a display element having a structure in which a material that is colored, decolored, or discolored by an electrochemical reaction when an electric field is applied is sandwiched between electrodes. An organic EL display (organic electroluminescence display) is a self-luminous display having a structure in which a plurality of thin films made of an organic material are sandwiched between a cathode and an anode. The liquid crystal display is a non-self-luminous display having a structure in which a liquid crystal layer is sandwiched between a pixel electrode and a counter electrode.

  An advantageous method for color display of electronic paper is a liquid crystal method and an electrochemical method. Since these can be switched between a reflection mode and a transmission mode, they can be applied to a multilayer display element. For example, by stacking RGB three-color display panels, the pixel area can be utilized to the maximum, so that a bright, high-contrast, and good-color display is possible. In other methods, since light cannot be set to a transmission mode, when performing color display, it is necessary to divide each pixel by disposing color filters that are colored in three colors on the display surface. For this reason, it is inevitable that the brightness and saturation will be lower than those of the stacked type.

  In a liquid crystal type multilayer reflective display panel, a cholesteric liquid crystal that selectively reflects light in a specific wavelength region by interference reflection is often used. A cholesteric liquid crystal display panel displays an image by setting the cholesteric liquid crystal of each pixel to a planar state in which incident light is reflected, a focal conic state in which incident light is transmitted, and a state in which liquid crystals in those states are mixed. . In the case of performing color display, a blue panel whose reflection dominant wavelength is blue (B) in a planar state, a green panel whose reflection dominant wavelength is green (G), a red panel whose reflection dominant wavelength is red (R), Are stacked. The stacking order is generally the order of the blue panel, the green panel, and the red panel in order from the observation side. When displaying blue, the blue panel is in the planar state, when displaying green, the green panel is in the planar state, and when displaying red, the red panel is in the planar state. When displaying white, all three panels of blue, green, and red are in a planar state.

  Furthermore, in the above multilayer reflective display panel, the blue light that has passed through the first blue panel is light that does not contribute to display and degrades display quality. Similarly, the green light that has passed through the second green panel is light that does not contribute to display and degrades display quality. Therefore, a blue cut filter is provided between the first layer blue panel and the second layer green panel, and a green cut filter is provided between the second layer green panel and the third layer red panel, which does not contribute to display. The display quality is improved by removing unnecessary light.

  Each panel has a similar configuration except for the reflection wavelength. In each panel, two transparent substrates on which a plurality of transparent electrodes are formed in parallel are arranged so that the surfaces on which the transparent electrodes are formed are opposed so that the transparent electrodes are orthogonal to each other when viewed from the observation surface. The intersection of the electrodes corresponds to the pixel. The two transparent substrates are bonded to each other so as to have a predetermined gap, and a cholesteric liquid crystal material is filled between the substrates. The two substrates are bonded together after spraying fine particles having a diameter corresponding to the gap on one substrate so that a predetermined gap is formed on the entire surface. A material for making the distance between the substrates such as fine particles a predetermined gap is referred to as a spacer member. In addition to the fine particles, the spacer member may be a columnar spacer that is provided between adjacent electrodes and is a lattice-like structure having an opening in a portion corresponding to a pixel.

  As described above, in the multilayer reflective display panel, white displayed in white display is a color obtained by combining the wavelength components of the three layers of reflected light. Since the cholesteric liquid crystal panel has a wide reflection wavelength band and the reflected light includes light in an extra wavelength region, white is not an achromatic color but has a tinted color. In the multilayer reflective display panel, the black color displayed in black is a color obtained by synthesizing the wavelength components of the scattered light of each layer.

  In display elements (electronic paper) with stacked cholesteric liquid crystal panels, the brightness and contrast ratio of the display surface are improved, and the color purity is improved, especially in white (W) display and black (Bk) display. Yes.

  FIG. 1A is a diagram showing the chromaticity of white (W) display and black (Bk) display in a general laminated cholesteric liquid crystal panel in a CIE color space. FIG. 1B shows the primary colors in color display of blue (B), green (G), red (B), cyan (C), yellow (Y), and magenta (M) in the CIE color space. It is the figure shown by. The CIE chromaticity diagram is a quantitative representation of the color, with the distance from the origin representing the saturation and the direction representing the hue.

  As shown in the drawing, the color of white (W) display is in a position where a * and b * are both in a positive space and are far away from the origin indicated by zero. This means that the color of white (W) display is a green color with a considerably large saturation. Similarly, the color of black (Bk) display is in a position where both a * and b * are in a negative space and not so far from the origin indicated by zero. This means that the black (Bk) display color is a magenta-colored and low-saturation color.

  As described above, in the general laminated cholesteric liquid crystal panel, the color of white (W) display is a color having a large saturation with a green color, and there is a problem that appropriate white display cannot be performed.

  In order to solve this problem, it is conceivable to use widely used color filters. Therefore, a filter that absorbs green (G absorption filter) is introduced between the first-layer blue panel and the second-layer green panel, and light reflected by the green panel is absorbed by the filter, thereby displaying white. Of achromatic color.

  2A is a diagram showing an example of wavelength transmission characteristics of a G absorption filter, and FIG. 2B is a diagram illustrating a G multilayer absorption cholesteric liquid crystal panel with a G absorption filter of FIG. FIG. 6 is a diagram showing the chromaticity of white (W) display and black (Bk) display in the CIE color space in the case of introducing the color.

  As shown in FIG. 2A, two types of G absorption filters P and Q are introduced. The G absorption filter P absorbs light in the wavelength range of 500 nm to 600 nm, has a maximum absorption wavelength of about 550 nm, and a minimum transmittance of 84% (maximum absorption rate of 16%). The G absorption filter P absorbs light in the wavelength range of 500 nm to 600 nm, the maximum absorption wavelength is about 550 nm, and the minimum transmittance is 68% (maximum absorption rate 32%). In other words, the G absorption filter P has an absorptance approximately twice that of the G absorption filter P in the wavelength range of 500 nm to 600 nm.

  In FIG. 2B, OW indicates the position of the white display color when the G absorption filter is not introduced, and OBk indicates the position of the black display color when the G absorption filter is not introduced. In other words, OW and OBk are at the same positions as W and Bk in FIG. PW indicates the position of the white display color when the G absorption filter P is introduced, PBk indicates the position of the black display color when the G absorption filter P is introduced, and QW indicates the case where the G absorption filter Q is introduced QBk indicates the position of the black display color when the G absorption filter Q is introduced.

  As shown in FIG. 2B, by introducing the G absorption filter, the positions of the white display and black display colors are parallel to the green G hue of FIG. 1B from OW and OBk. It can be seen that the amount of movement is in accordance with the absorption rate of the G absorption filter. Specifically, when the G absorption filter P is introduced, the white display color PW becomes a yellowish color, the saturation is lowered, and the black display color PBk is a magenta color. The saturation increases. When the G absorption filter Q is introduced, the white display color QW becomes an orangeish color, the saturation further decreases, and the black display color QBk remains a magenta color. , Saturation further increases.

  As shown in FIG. 2B, by introducing the G absorption filter, the white display color is achromatic, but there is a problem that the saturation of the black display color is increased.

  Further, since the chromaticity changes greatly due to a slight difference in density of the G absorption filter, it is necessary to develop a G absorption filter for fine adjustment of the color of the display, which cannot be easily realized. .

JP 2001-305551 A International Publication (WO) 2007 / 004286A1

  According to the embodiment, a reflective display panel of white display and black display close to an achromatic color is realized.

  According to a first aspect of the present invention, a plurality of laminated reflective display panels, and a light absorption layer disposed on the back surface of the laminated plural reflective display panels, each reflective display panel includes: Two substrates arranged so as to oppose each other, two sets of transparent electrodes formed on the opposing surfaces of the two substrates so as to intersect when viewed from the observation direction, and the intersection of the two sets of transparent electrodes It is formed in a lattice shape so as to surround the pixel with the part as a pixel, and is reflected by a spacer member that defines the distance between the two substrates and a voltage applied between the transparent electrodes sealed between the two opposing substrates. There is provided a multilayer reflective display panel having a reflective material layer whose state changes, and having an aperture ratio defined by a lattice-like spacer member that is different in at least some of the reflective display panels.

  According to the embodiment, a reflective display panel with improved white display and black display quality is realized.

FIG. 1 shows positions in the CIE color space of white (W) display and black (Bk) display chromaticity in a general laminated cholesteric liquid crystal panel, and blue (B) and green (G ), Red (B), cyan (C), yellow (Y), and magenta (M) are diagrams showing trajectories in the CIE color space. FIG. 2 shows an example of wavelength transmission characteristics of a G absorption filter and the chromaticity of white (W) display and black (Bk) display when the absorption filter is introduced into a general laminated cholesteric liquid crystal panel. It is the figure shown by. FIG. 3 is a diagram illustrating a schematic configuration of a display device using the multilayer display panel of the embodiment. FIG. 4 is a diagram illustrating a cross-sectional structure and a spacer shape of the multilayer display panel of the embodiment. FIG. 5 is a diagram showing the chromaticity of white (W) display and black (Bk) display in the CIE color space in the multilayer display panel of the embodiment.

  FIG. 3 is a diagram illustrating a schematic configuration of a display device (device) using the cholesteric liquid crystal according to the embodiment. The display device of the embodiment includes a display panel 10 using cholesteric liquid crystal, a scan electrode drive circuit 41, and a data electrode drive circuit 42.

  FIG. 4 is a diagram showing a cross-sectional structure of the display panel 10 used in the embodiment.

  First, a schematic configuration of a display panel 10 using cholesteric liquid crystal and a display device using the same will be described with reference to FIGS.

  The display panel 10 has a configuration in which three display panels using cholesteric liquid crystal are stacked, the light absorption layer 15 is provided on the back side, and the surface-side functional layer 50 is bonded to the observation surface side with the transparent adhesive layer 18. The surface side functional layer 50 functions as an AG (Anti Glare) layer and a protective film.

  The three laminated panels have the same configuration, and are different in that the reflection dominant wavelengths are 480 nm (blue), 550 nm (green), and 650 nm (red), respectively. Three panels are laminated | stacked in order of a blue panel, a green panel, and a red panel in order from the observation side.

  FIG. 3 shows a case where the display panel 10 is viewed from a direction perpendicular to the substrate. As described above, since the three panels have the same configuration except for the reflection wavelength, in FIG. 3, each part of the panel is shown in common by reference numerals without B, G, R, and common These elements will be described without adding B, G, and R.

  The display panel 10 has a structure in which an upper substrate 11 on which a plurality of parallel scanning electrodes 13 are formed and a lower substrate 12 on which a plurality of parallel data electrodes 14 are formed face each other, and a liquid crystal is filled between the substrates. Have.

  The plurality of scanning electrodes 13 and the plurality of data electrodes 14 are transparent electrodes and are arranged so as to be orthogonal when viewed from a direction perpendicular to the substrate, and a region where the scanning electrodes 13 and the data electrodes 14 intersect is a pixel region. Become. Accordingly, the plurality of pixel electrodes are arranged in a matrix. A sealing material 16 is provided between the upper substrate 11 and the lower substrate 12 so as to surround the pixel region, and an internal space surrounded by the sealing material 16 is filled with a cholesteric liquid crystal material to form a liquid crystal layer 17. Reference numeral 20 is an injection port for filling the internal space surrounded by the sealing material 16 with the cholesteric liquid crystal material, and is sealed after the injection of the cholesteric liquid crystal material.

  The scan electrode drive circuit 41 is mounted with a general-purpose STN driver IC having a TCP (tape carrier package) structure, for example, and drives the plurality of scan electrodes 13. The output terminal of the scan electrode drive circuit 41 is connected to the plurality of scan electrodes 13 by wiring 43 formed in the flexible circuit. The data electrode drive circuit 42 is mounted with a general-purpose STN driver IC having a TCP structure, and drives the plurality of data electrodes 14. The output terminal of the data electrode driving circuit 42 is connected to the plurality of running data electrodes 14 by wiring 44 formed in the flexible circuit. Although a circuit for supplying power and control signals to the scan electrode drive circuit 41 and the data electrode drive circuit 42 is provided, illustration is omitted. Although it is possible to provide three scan electrode drive circuits 41 according to the three panels, one scan electrode drive circuit 41 is provided and the scan electrodes 13 of the three panels are driven in common. Is also possible.

  A modification in which the data electrode 14 is formed on the upper substrate 11 and the scanning electrode 13 is formed on the lower substrate 12 is also possible.

  The liquid crystal material is a cholesteric liquid crystal obtained by adding 10 to 40% by weight of a chiral material to a nematic liquid crystal mixture. The addition ratio of the chiral material 0 is a value when the total amount of the nematic liquid crystal component and the chiral material is 100% by weight. The color of the reflected light and other various characteristics are determined by the mixing ratio of the nematic liquid crystal component and the chiral material.

  As the nematic liquid crystal component, known components can be used, but in order to relatively reduce the driving voltage of the liquid crystal layer 22, it is desirable that the dielectric anisotropy Δε is 20 ≦ Δε ≦ 50. The refractive index anisotropy Δn of the cholesteric liquid crystal is preferably 0.18 ≦ Δn ≦ 0.24. When the refractive index anisotropy Δn is smaller than this range, the reflectivity of the liquid crystal layer 17 in the planar state becomes low. On the other hand, if the refractive index anisotropy Δn is larger than this range, the scattering reflection of the liquid crystal layer 17 in the focal conic state increases, and the viscosity also increases, so the response speed decreases.

  The upper substrate 11 and the lower substrate 12 are formed of a transparent base material. Examples of such a substrate include glass or a resin base material. For example, glass substrates such as quartz glass, soda glass, borosilicate glass, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), polysulfone (PSF), ZEONOR, ZEONEX And cyclone resins represented by product brands such as Arton (manufactured by JSR).

  The scan electrode 13 and the data electrode 14 can be formed of a known material, for example, indium tin oxide (ITO) is typical, but other indium zinc oxide (IZO), tin oxide, and the like. An oxide-based transparent conductive film such as an electrode, an electrode in which a metal such as silver formed into an elongated fiber is arranged in a network structure, a metal electrode such as aluminum or silicon, or a photoconductive film such as amorphous silicon can be used. .

  In the case of a display panel using cholesteric liquid crystal as a reflective layer, an insulating film and an alignment film for controlling the alignment of liquid crystal molecules (both not shown) are coated on the transparent electrode as a functional film. Preferably it is. The insulating film has a function of preventing a short circuit between the opposing electrodes and improving the reliability of the display panel as a gas barrier layer. For the alignment film, organic films such as polyimide resin, polyamideimide resin, polyetherimide resin, polyvinyl butyral resin, and acrylic resin, and inorganic materials such as silicon oxide and aluminum oxide can be used.

  In the display panel 10 of the embodiment, the liquid crystal layer 17 is applied with a voltage between the scanning electrode 13 and the data electrode 14, so that for each pixel, a planar state that reflects incident light and a focal conic state that transmits incident light. Can be set.

  Therefore, as shown in FIG. 4A, the blue panel faces the upper substrate 11B on which a plurality of parallel scanning electrodes 13B are formed and the lower substrate 12B on which a plurality of parallel data electrodes 14B are formed. The liquid crystal layer 17B is formed by arranging and filling the liquid crystal between the substrates. A sealing material 16B is provided between the upper substrate 11B and the lower substrate 12B so as to surround the pixel region, and an internal space surrounded by the sealing material 16B is filled with a cholesteric liquid crystal material to form a blue liquid crystal layer 17B. The As will be described later, the blue liquid crystal layer 17B is partitioned by columnar spacers 30B.

  Similarly, in the green panel, an upper substrate 11G on which a plurality of parallel scanning electrodes 13G are formed and a lower substrate 12G on which a plurality of parallel data electrodes 14G are formed face each other, and a liquid crystal is filled between the substrates. The liquid crystal layer 17G is formed. A sealing material 16G is provided between the upper substrate 11G and the lower substrate 12G so as to surround the pixel region, and an internal space surrounded by the sealing material 16G is filled with a cholesteric liquid crystal material to form a green liquid crystal layer 17G. The

  Further, the red panel has an upper substrate 11R on which a plurality of parallel scanning electrodes 13R are formed and a lower substrate 12R on which a plurality of parallel data electrodes 14R are formed facing each other, and a liquid crystal is filled between the substrates. The liquid crystal layer 17R is formed. A sealing material 16R is provided between the upper substrate 11R and the lower substrate 12R so as to surround the pixel region, and an internal space surrounded by the sealing material 16R is filled with a cholesteric liquid crystal material to form a red liquid crystal layer 17R. The

  The blue panel, the green panel, and the red panel exhibit a reflection spectrum of blue, green, and red, respectively, when in a reflective state, and the respective reflection dominant wavelengths are 480 nm (blue), 550 nm (green), and 650 nm (red). It is.

  The first blue panel and the second green panel are bonded by a blue cut filter 21 having an adhesive function. The green panel of the second layer and the red panel of the third layer are bonded by a green cut cut filter 22 having an adhesive function.

  As described above, in order to keep the thickness (cell gap) of the liquid crystal layer 17 uniform, spherical spacers made of resin or inorganic oxide are dispersed over the entire display surface. Then, a columnar spacer (spacer member) 30 as shown in FIG. 4B is formed in the layer. The columnar spacers 30B, 30G and 30R of each panel have a shape similar to that of the columnar spacer 30 shown in FIG. 4B, but the aperture ratio of at least one panel is different.

  The columnar spacer 30 has a height corresponding to the cell gap and is formed as a wall surrounding the pixel region. In other words, the columnar spacer 30 is a wall extending between the scanning electrodes 13 and the data electrodes 14. The columnar spacer 30 is formed by lithography, for example.

  The columnar spacer 30 has a notch 31 in a part of the wall, and is connected to an adjacent pixel through the notch 31. The liquid crystal material is filled by a pumping method in which the space between the two substrates is evacuated and the injection port 20 is immersed in the liquid crystal material held in the container to fill the space between the substrates with the liquid crystal material. Is called. The notch 31 is provided for the liquid crystal material to pass through the pixel region. Note that when the liquid crystal material is filled in a dropping manner, it is not necessary to provide the notch 31.

  The cell gap d of the liquid crystal layer 17 is preferably in the range of 2 μm ≦ d ≦ 8 μm. If the cell gap d is smaller than this range, the reflectivity of the liquid crystal layer 17 in the planar state is lowered, and if it is larger than this range, it is necessary to increase the driving voltage.

  In general, the ratio of the area surrounded by the columnar spacers 30 to the area per pixel is referred to as the aperture ratio. In conventional stacked cholesteric liquid crystal panels, the columnar spacers 30 of the three panels have the same shape and the same aperture ratio.

  On the other hand, in the panel 10 of the embodiment, the aperture ratio of the green panel is made smaller than the aperture ratios of the blue panel and the red panel. Specifically, the aperture ratio of the blue panel and the red panel is 87%, and the aperture ratio of the green panel is 80%. This reduces the green reflected light when the liquid crystal material of the green panel is in the planar state, and reduces the green light during white display. Since the light incident on the columnar spacer 30 is transmitted as it is and absorbed by the light absorption layer 15, it is equivalent to the case where the liquid crystal material of the green panel is set in the focal conic state, and the green light during white display does not change.

  FIG. 5 is a diagram showing the chromaticity of white (W) display and black (Bk) display in the CIE color space in the multilayer display panel of the embodiment. As apparent from the comparison with FIG. 2B, the chromaticity of the white (W) display is similar to the chromaticity PW when the G absorption filter P is introduced, but the black (Bk) display. The chromaticity is about the same as the chromaticity OBk when the G absorption filter is not introduced. In other words, the color of white (W) display is a low saturation color with yellow, and the color of black (Bk) display is a low saturation color with magenta. Therefore, the multilayer display panel of the embodiment has both low chromaticity in white (W) display and black (Bk) display, and can perform color display with high display quality.

  The example in which the white (W) display color has a large green saturation has been described, but the configuration of the embodiment can be similarly applied to a case where the white (W) display color exhibits another color. . For example, when the white (W) display color is blue or red, the aperture ratio of the blue panel or the red panel is made smaller than the aperture ratio of the other panels. Further, when the color of white (W) display is yellow, the aperture ratio of the green panel and the red panel is made smaller than the aperture ratio of the blue panel. In this case, the aperture ratio of the green panel may be different from that of the red panel, for example, the aperture ratio of the green panel is made smaller than the aperture ratio of the red panel. When the white (W) display color is cyan, the aperture ratio of the green panel and the blue panel is made smaller than the aperture ratio of the red panel. When the white (W) display color is magenta, the aperture ratio of the red panel and the blue panel is made smaller than that of the green panel.

  As described above, a display panel using cholesteric liquid crystal has been described as an example. However, other materials can be used as long as the reflective material layer performs display by switching between a light transmitting state and a light reflecting state. is there. Specifically, reflective liquid crystal materials other than cholesteric liquid crystals, electrochromic materials, and electrodeposition materials can be used. Among such materials, since the liquid crystal material has a large scattering when transmitting light, a large effect can be obtained in a laminated display panel in which a plurality of display panels are bonded.

  Although the embodiment has been described above, all examples and conditions described herein are described for the purpose of helping understanding of the concept of the invention applied to the invention and the technology. It is not intended to limit the scope of the invention, and the construction of such examples in the specification does not indicate the advantages and disadvantages of the invention. Although embodiments of the invention have been described in detail, it should be understood that various changes, substitutions and modifications can be made without departing from the spirit and scope of the invention.

DESCRIPTION OF SYMBOLS 11 Upper substrate 12 Lower substrate 13 Scan electrode 14 Data electrode 15 Light absorption layer 16 Sealing material 17 Liquid crystal layer 30 Columnar spacer (spacer member)
41 Scan electrode drive circuit 42 Data electrode drive circuit

Claims (5)

A plurality of laminated reflective display panels;
A light absorption layer disposed on the back surface of the plurality of laminated reflective display panels,
Each reflective display panel
Two substrates arranged to face each other;
Two sets of transparent electrodes formed on the opposing surfaces of the two substrates so as to intersect when viewed from the observation direction;
A spacer member that defines the distance between the two substrates, which is formed in a lattice shape so as to surround the pixel, with the intersection of the two sets of transparent electrodes as a pixel,
A reflective material layer that is sealed between the two substrates facing each other and changes a reflection state by a voltage applied between the transparent electrodes,
The multilayer reflective display panel, wherein an aperture ratio defined by the lattice-like spacer member is different in at least a part of the reflective display panels. Comprising three laminated reflective display panels;
Reflective dominant wavelengths of the reflective material layers of the three reflective display panels are blue, green, and red in order from the observation surface side,
2. The multilayer reflective display panel according to claim 1, wherein the aperture ratio of the panel whose reflection main wavelength is green is smaller than the aperture ratio of the panel whose reflection main wavelengths are blue and red. A blue cut filter layer disposed between the blue and green panels having a reflection dominant wavelength;
The multilayer reflective display panel according to claim 1, further comprising a green cut filter layer disposed between the green and red panels having a reflection main wavelength.   4. The multilayer reflective display panel according to claim 1, wherein the lattice-shaped spacer member has a cutout portion that connects adjacent pixels. 5.   The multilayer reflective display panel according to claim 1, wherein the reflective material layer includes cholesteric liquid crystal.

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