JP2005099705A - Reflective substrate and liquid crystal display panel using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflective substrate which is given light directivity to a desired angle and can suppress generation of interference fringes and a liquid crystal display panel using the reflective substrate. <P>SOLUTION: The liquid crystal display panel has liquid crystal sandwiched between a couple of substrates, one of which is a substrate having a resin film, having recessed parts or projection parts 14 in a shape having two orthogonal long and short axes in a pixel, and a reflecting film on the resin film, the recessed parts or projection parts are being arranged so that center points of the recessed parts or projection parts are arranged at lattice points (30, 32, 34, 36, 38, 40, and 42) of a hexagonal close-packed lattice and at least one of center axes (44, 46) as lines connecting six lattice points adjacent to an arbitrary lattice point is nearly parallel to the long-axis direction of the recessed parts or projection parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a reflective substrate for a liquid crystal display panel and a liquid crystal display panel using the reflective substrate.

  Previously, a flat film was used for the reflective film of the liquid crystal panel. However, when a flat reflective film was used, there was a problem that the incident light was specularly reflected by the reflective film, making it difficult to see. . Therefore, in order to make the reflective film have scattering properties, a configuration has been adopted in which irregularities are made of resin and a reflective film is formed thereon. However, there is a new problem that interference fringes are generated depending on the arrangement of the projections and depressions to make it look like a rainbow.

  In order to solve this problem, an uneven portion is provided on the reflective electrode, each lattice point of the square lattice or the close-packed lattice is moved randomly, and a part of the lattice points is randomly removed, and the lattice point position is obtained. A proposal has been made to arrange the center of a concave portion or a convex portion (for example, see Patent Document 1).

  However, in this prior art, since the light directivity to a desired angle cannot be given, the brightness at an easy-to-see angle is still insufficient. Here, terms relating to directions used in this specification are defined with reference to FIG. As shown in FIG. 6A, on the front side of the liquid crystal panel 10, the direction perpendicular to the liquid crystal panel is the normal direction and the viewer is at the lower side of the liquid crystal panel and looks at the liquid crystal panel at 6 o'clock. The direction and the upper side are the 12 o'clock direction. As shown in FIG. 6B, the left hand side is defined as the 9 o'clock direction and the right hand side is defined as the 3 o'clock direction on the assumption that a viewer is viewing the liquid crystal panel at the 6 o'clock direction of the liquid crystal panel.

  In general, when a liquid crystal display panel is used in a reflective type, light is often incident from the 12 o'clock direction of the liquid crystal panel, while it is easy for a viewer to see near the normal direction of the liquid crystal panel. That is, it is considered that increasing the reflected light intensity in the normal direction with respect to the incident light from the 12 o'clock direction leads to an improvement in the brightness of the liquid crystal panel. On the other hand, in the above prior art, since the shape of the concave portion or the convex portion arranged at the lattice point is an isotropic shape such as a circle, the method is assumed under the assumption that light is incident from four directions. Although the reflected light intensity in the line direction can be increased, when the light incident from the 12 o'clock direction is assumed as the center, the reflected light at the normal direction, that is, at an easy-to-see angle, becomes weak.

  In order to solve this problem, a large number of convex portions are formed on the reflective film in an oval dome shape, thereby increasing the reflected light in the direction perpendicular to the major axis of the convex portions, thereby improving the light directivity. Has been proposed (see, for example, Patent Document 2).

JP-A-11-337964 JP 2002-258270 A

But problems remain. In the technique of Patent Document 1, since it is necessary to remove some of the lattice points, the number of flat portions on the reflective substrate increases, and the reflected light in the normal direction increases as the specular reflection component of light increases. Will be lower. Therefore, there is a problem that the light directivity to a desired angle cannot be provided, and the brightness in the normal direction, which is an easy-to-see angle, becomes further dark. Further, the technique of Patent Document 2 has a problem that it is impossible to suppress the generation of interference fringes in which the reflected light looks like a rainbow.

  The problem to be solved by the present invention is that there is no means satisfying both of “providing light directivity at a desired angle” and “suppressing generation of interference fringes”.

  The reflective substrate of the present invention is a reflective substrate comprising a resin film provided with a concave or convex part having a shape having two orthogonal axes of a major axis and a minor axis, and a reflective film on the resin film. The center points of the recesses or projections are arranged at the lattice points of a hexagonal close-packed lattice, and the center axis is a line connecting each of the lattice points and six adjacent lattice points, and at least one of the center axes. The recesses or projections are arranged such that two central axes are substantially parallel to the major axis direction of the recesses or projections.

  The reflective substrate of the present invention is characterized in that the lattice points are randomly moved.

  The reflective substrate of the present invention is characterized in that the shape or size of each of the concave or convex portions is randomly changed.

  The liquid crystal display panel of the present invention is a liquid crystal display panel having a plurality of pixels with a liquid crystal sandwiched between a pair of substrates, and one of the pair of substrates has a major axis and a short axis in the pixels. A substrate having a resin film having a concave or convex portion having two axes orthogonal to each other and a reflective film on the resin film, and the central point of the concave or convex portion is arranged at a lattice point of a hexagonal close-packed lattice. A line connecting each of the lattice points and six adjacent lattice points is a central axis, and at least one of the central axes is substantially parallel to the major axis direction of the concave portion or the convex portion. As described above, a concave portion or a convex portion is arranged.

  The liquid crystal display panel according to the present invention is characterized in that one of the major axis direction of the concave portion or the convex portion and the central axis is substantially parallel to the direction of 3: 9.

  The liquid crystal display panel of the present invention is characterized in that the lattice points are randomly moved. Or each shape or magnitude | size in the said recessed part or convex part was changed at random, It is characterized by the above-mentioned.

  The liquid crystal display panel of the present invention is characterized in that a reflective film is formed on a part of the concave portion or convex portion. Furthermore, the reflective film may be strip-shaped.

  According to the present invention, a reflective substrate capable of efficiently reflecting light at a desired angle without causing interference fringes and a liquid crystal display panel using the same can be realized. In addition, the interference fringes can be further reduced by randomly moving the lattice points of the uneven portions. As another solution, interference fringes can be further reduced by randomly changing the shape or size of the concave or convex portions. Furthermore, the reflected light at a desired angle of the liquid crystal panel can be increased by making one central axis out of the major axis direction and the central axis of the concave portion or convex portion substantially parallel to the direction of 3 o'clock 9 o'clock. It was.

A center point of a concave or convex portion having a shape of two major axes of a major axis and a minor axis provided on a reflective substrate is arranged at a lattice point of a hexagonal close-packed lattice, and six lattice points adjacent to the arbitrary lattice point The recesses or projections are arranged so that at least one of the central axes is substantially parallel to the major axis direction of the recesses or projections. The lattice points are moved randomly. As another solution, the shape or size of the concave or convex portions is changed randomly.
Further, when this reflective substrate is used for a liquid crystal display panel, if the viewer is in the 6 o'clock direction of the liquid crystal panel, one central axis of the major axis direction and the central axis of the concave portion or the convex portion is 3 It should be approximately parallel to the 9 o'clock direction.

  FIG. 1 is a diagram showing a first embodiment of a reflective substrate according to the present invention, and FIGS. 2, 3, 4, and 5 are diagrams for explaining the present invention. In FIG. 1, reference numeral 12 denotes a reflective substrate according to the present invention, and a large number of recesses 14 are provided on the reflective substrate.

As shown in FIG. 3 (a), the shape of the recess 14 can be variously selected from 18 rectangles, 20 rectangles with inclined corners, 22 ellipses, and 24 rectangles and circles. It is necessary to have two orthogonal axes, a and a short axis b. In this embodiment, the major axis a is set to about 20 μm and the minor axis b is set to 10 μm. The center 26 of the recess of each shape is the center point. In the drawings of this specification, an example in which the concave portion 14 is an ellipse is shown. Even if the concave portion 14 is formed in the convex portion, the effect on the optical characteristics is almost the same. In addition, since the concave portions can be densely arranged in the present invention, there is no great difference between the concave shape and the convex shape in the actual shape of the reflective substrate. Although the embodiment of the present specification will be described as a concave portion, it should be understood that the present invention includes both a concave portion and a convex portion.
FIG. 3B is a diagram for explaining a cross-sectional shape obtained by cutting the recess 14 on the short axis passing through the center point 26, and the recess 14 is formed on the resin film 28. The depth of the recess is designed to be about 1 μm with respect to the minor axis diameter of about 10 μm. As a result of setting the depth of the recess to 1 μm, the slope angle of the recess is about 1
It is 0 °.
FIG. 3C is a cross-sectional view for explaining the shape when the concave portion 14 is changed to a convex portion. In the case of the convex portion, the convex portion 29 may be formed on the surface of the resin film 28 as shown.

  Returning to FIG. 1, the concave portion 14 is arranged at the lattice points of the hexagonal close-packed lattice such that the central point 26 of each concave portion shown in FIG. 3A is like a portion 16 surrounded by a dotted line in FIG. Yes. FIG. 1B is an enlarged view of the dotted line portion 16, and a hexagonal close-packed lattice is formed by the lattice points 30, 32, 34, 36, 38, 40, 42, and the seven concave portions 14 are not shown. The center point 26 is arranged at each lattice point. Six lines indicated by solid thin lines connecting the lattice point 30 and the six adjacent lattice points 32, 34, 36, 38, 40, 42 are the central axes, and the lattice points 30 and 32 of the central axes are the central axes. And a central axis 46 connecting the lattice points 30 and 34 are arranged so as to be substantially parallel to the major axis direction of the recess 14.

  FIG. 2A is a cross-sectional view of a liquid crystal display panel using such a reflective substrate 12. A polarizing plate 52 is provided on the upper surface of the upper transparent substrate 48, and an upper transparent electrode 56 is provided on the lower surface. A reflective layer 54 is provided on the upper surface of the transparent substrate 50, and a lower transparent electrode 58 is provided on the reflective layer 54. The substrates 48 and 50 are sealed by the seal portions 60 and 62, and a liquid crystal substance is held in a gap formed by the substrates 48 and 50 and the seal portions 60 and 62, thereby forming a liquid crystal layer 64. A liquid crystal display panel 68 is constituted by these elements. The lower transparent substrate 50 and the reflective layer 54 constitute the reflective substrate 12 of FIG. 1A. When used in a liquid crystal panel, the reflective substrate of FIG. The upper part of 12 is attached at 12 o'clock, the lower part is at 6 o'clock, the right is at 3 o'clock, and the left is at 9 o'clock. Accordingly, the central axes 44 and 46 in FIG. 1B are substantially parallel to the 3 o'clock and 9 o'clock direction.

  Here, at least the lower transparent electrode 58 is divided into a plurality of pixels. Further, it is possible to realize a transmissive / reflective type panel by removing a part of the reflective film for each pixel and placing a backlight or the like on the lower surface of the liquid crystal panel 68 by a normal technique. For the sake of simplicity, the alignment film and the like are not shown in FIG.

FIG. 2 (b) is a cross-sectional view of the reflective substrate 12 according to the present invention, on the lower transparent substrate 50,
A resin film 28 having concave portions and a reflective film 66 on the resin film 28 are provided. The reflective substrate 12 is constituted by these.

  Throughout this specification, similar members are denoted by the same reference numerals.

  As a result of configuring the reflective substrate 12 in this manner, it has been found that according to the present invention, interference fringes become inconspicuous without removing the concave portions 14 on the respective lattice points. This effect is produced because the concave portion is an ellipse or a rectangle having a major axis and a minor axis, or an intermediate shape between the two, and is arranged in a hexagonal close-packed lattice, and at least one center of the central axes. This is probably because the concave portion is arranged so that the axis is substantially parallel to the major axis direction of the concave portion.

5A and 5B are diagrams for explaining light reflection characteristics of a reflective substrate according to the present invention and a liquid crystal display panel using the reflective substrate. FIG. 5A is a diagram for explaining a measurement method, and FIG. It is the characteristic view which measured the display panel.
In FIG. 5A, a sample 74 is a liquid crystal display panel 68 using the reflective substrate 12 of the present invention. The light source 70 is provided at an angle of 30 ° from the normal direction of the sample 74. When measuring the characteristic in the Y axis direction, the position is 30 ° in the 12 o'clock direction, and when measuring the characteristic in the X axis direction, it is 9 o'clock. Provided at 30 ° position. The reflected light intensity is measured by the luminance meter 72. When measuring characteristics in the Y-axis direction, scan the luminance meter from 12 o'clock to 6 o'clock on the liquid crystal panel, and when measuring characteristics in the X-axis direction, scan the luminance meter from 9 o'clock to 3 o'clock. And measure.

FIG. 5B shows the reflected light intensity characteristic of the reflective substrate 12 according to the present invention, where the vertical axis represents the reflected light intensity and the horizontal axis represents the reflection angle. Here, the reflected light intensity indicates the relative reflectance with respect to the standard white plate, the reflection angle indicates the angle from the normal direction of the sample, the light source side is negative with respect to the sample normal, and the opposite side to the light source Is positive.
76 is the Y-axis reflected light intensity characteristic, data measured by scanning the luminance meter from 12 o'clock to 6 o'clock direction, 78 is the X-axis reflected light intensity characteristic, and the luminance meter is scanned from 9 o'clock to 3 o'clock direction It is the data measured. Looking at the X-axis characteristic 78, the reflected light intensity rises from about −15 ° from the normal direction of the sample 74, rapidly rises from an angle exceeding 15 °, and peaks at 30 °. Looking at the Y-axis characteristic 76, the reflected light intensity rises from about −20 ° from the normal direction, rises sharply from −15 to −5 °, and becomes substantially flat at an angle of −5 to 10 °, It rises again from around 15 ° and peaks at 30 °.
As is clear from FIG. 5B, the amount of reflected light is clearly different between the X-axis direction and the Y-axis direction. This is the effect that the concave portion is made into an elliptical shape, and the major axis direction of the concave portion is parallel to the direction of 3 o'clock to 9 o'clock. Since the number of reflective surfaces that can reflect the light in the normal direction has increased, the slope parallel to the 12 o'clock direction, that is, the reflective surface that can reflect light from the 9 o'clock direction in the normal direction is This is because it decreased.
This situation indicates that most of the light incident from the 12 o'clock direction is reflected in the normal direction. In actual use, external light when the liquid crystal display panel is used in a reflective type often enters from the 12 o'clock direction of the liquid crystal panel. Therefore, if the reflective substrate of the present invention is used, light in the normal direction is used. It seems that directivity was achieved.

  As described above, according to the reflective substrate 12 of the present invention, it is possible to satisfy both of the two points of “giving light directivity to a desired angle” and “suppressing generation of interference fringes”. Is big.

  FIG. 9 is a diagram for explaining a method of manufacturing the reflective substrate 12 according to the present invention, and illustrates each manufacturing process of the reflective substrate having the recess 14.

  In the process of FIG. 9A, a positive photosensitive first-layer resin film 116 is applied on a transparent substrate 50 such as glass by a spin coating method to a thickness of about 2.5 μm.

  In the step of FIG. 9B, the first resin film 116 of FIG. 9A is exposed and developed using the mask 118. The opening 120 of the mask 118 has an elliptical shape, and when viewed from the top, the elliptical opening 122 is aligned with the lattice points of the hexagonal close-packed lattice. The developed first-layer resin film 124 has a shape in which a portion to be a recess is removed in an elliptical shape.

  Thereafter, in order to obtain transparency of the first-layer resin film 124, the entire surface is irradiated with ultraviolet rays using an exposure apparatus using a high-pressure mercury lamp as a light source. Further, baking is performed at 220 ° C. for 60 minutes in a clean oven to thermally cure the first resin film 124.

  FIG. 9C shows a step of applying a second layer resin film 126, in which a resin having the same material as that of the first layer resin films 116 and 124 is applied by a spin coating method to a thickness of about 2 μm.

  Thereafter, in order to obtain transparency of the second-layer resin film 126, the entire surface is irradiated with ultraviolet rays using an exposure apparatus using a high-pressure mercury lamp as a light source. Further, baking is performed at 220 ° C. for 60 minutes in a clean oven to thermally cure the second layer resin film 126.

FIG. 9D is a view showing a completed resin film 28 having a recess. In the completed state, the recess of the resin film 28 is about 1 μm, and the average thickness of the resin film 28 is about 3.5 to 4.5 μm. When the first resin film 116 is set to about 2.5 μm, a dent of about 1 μm is obtained in the completed state. At this stage, since the concave portions are arranged very densely, there are few flat portions on the resin film 28. Therefore, it has a shape in which continuous wavy irregularities are arranged.

  FIG. 9E shows a reflective film forming process, in which an aluminum alloy film 66 is formed on the entire surface of the resin film 28 by sputtering. In this way, the reflective substrate 12 shown in FIG. 2B is obtained.

FIG. 4 is a view for more clearly defining the present invention, and a large number of recesses 14 are provided on the reflective substrate 80. As in the case of FIG. 1, the concave portions 14 are arranged at the lattice points of the hexagonal close-packed lattice like the portion 82 surrounded by the dotted line in FIG. FIG. 4B is an enlarged view of the dotted line portion 82, and a hexagonal close-packed lattice is formed by lattice points 84, 86, 88, 90, 92, 94, and 96, and the seven concave portions 14 are not shown. The center point 26 is arranged at each lattice point. What is different from FIG. 1 is the shape of a hexagonal close-packed lattice. 4, the central axis viewed from the lattice point 84 is indicated by six solid thin lines. In FIG. 1B, the central axis 44 connecting the lattice points 30 and 32 of the central axis, 4 is arranged so as to be substantially parallel to the long axis direction of the recess 14, whereas in FIG. 4B, there exists a central axis that is substantially parallel to the long axis direction. Instead, the central axis 100 connecting the lattice points 84 and 92 and the central axis 98 connecting the lattice points 84 and 94 are arranged so as to be substantially parallel to the minor axis direction of the recess 14. On the other hand, FIG. 1B does not have a central axis substantially parallel to the minor axis direction. When the concave portion 14 is arranged as shown in FIG. 4A, it has been found that the interference fringes are conspicuous particularly when viewed from the 6 o'clock 12 o'clock direction.
That is, when arranged in a hexagonal close-packed lattice, it is installed in a parallel direction as a combination of the arrangement of the central axis connecting the central lattice points of the hexagonal close-packed lattice with the surrounding lattice points and the major axis direction of the concave and convex shape having two orthogonal axes. It can be considered that the patterns are arranged in the orthogonal direction, but the interference fringes can be made inconspicuous by installing each in the parallel direction. As described above, the feature of the present invention is that the recesses are arranged at the respective lattice points of the hexagonal close-packed lattice so that at least one of the center axes of the hexagonal close-packed lattice is substantially parallel to the major axis direction of the recess. As shown in FIG. 4, when a hexagonal close-packed lattice in which at least one central axis is substantially parallel to the minor axis direction of the recess is employed, the effect of the present invention does not occur.

  FIG. 7 is a diagram showing a second embodiment of the reflective substrate according to the present invention, in which the lattice points are randomly moved and concave portions are arranged on the respective lattice points. When the lattice points are moved randomly on the reflective substrate 102 as shown in FIG. 7, the effect that the interference fringes become inconspicuous further than in the case of FIG. Such a reflective substrate 102 can be manufactured by the same method as in FIG. 9 only by changing the pattern of the mask 118 in FIG.

  FIG. 8 is a view showing a third embodiment of the reflective substrate according to the present invention, in which each shape or size in the recess is randomly changed. A plurality of types of major axis lengths and minor axis lengths of the recesses were prepared. If there are many types, the interference fringes become inconspicuous. However, in FIG. 8B, the drawing is performed using the concave portions of four types 104, 106, 108, and 110 shown in FIG. 8A. If concave portions whose shapes are randomly changed are arranged on the reflective substrate 112 as shown in FIG. 8B, the interference fringes are less noticeable than in the case of FIG. Occurred. Such a reflective substrate 112 can be manufactured by a method similar to that shown in FIG. 9 only by changing the pattern of the mask 118 shown in FIG.

  As shown in a portion 114 surrounded by a dotted line in FIG. 8B, in the third embodiment, the center point of the concave portion is arranged on a lattice point of a hexagonal close-packed lattice similar to FIG. Further, as in the third embodiment, it is a matter of course that the result may be obtained by changing the shape or size of the recesses and further moving the lattice points randomly as in the second embodiment.

  As described above, according to the present invention, interference fringes are not conspicuous and a bright image can be obtained at a desired angle.

  FIG. 10 is a view showing a fourth embodiment of the reflective substrate according to the present invention, in which a reflective film 66 is formed in a part of the recess 14. In this way, by partially removing the reflective film and forming an opening in the reflective film, a transflective liquid crystal display panel that enables not only reflective display but also transmissive display can be created. At this time, if the reflective film 66 is arranged in a strip shape along the 6 o'clock slope of the recess 14, light from the 12 o'clock direction can be efficiently reflected, and the amount of light of the liquid crystal display panel during reflection is increased. Effect.

  In particular, in the present invention, the center point of the concave portion is arranged at the lattice point of the hexagonal close-packed lattice, and the arbitrary central axis is arranged in parallel with the major axis direction of the concave portion and in the direction parallel to the 3 o'clock to 9 o'clock direction. Therefore, if the reflective film is disposed in a band shape, the reflective film can be efficiently disposed on the slope of each recess at 6 o'clock.

  The reflective substrate on which the band-shaped reflective film arranged in FIG. 10 is arranged is a reflective film arrangement that places importance on the reflection characteristics, but FIG. 11 shows an example of a reflective film arrangement that places importance on the transmission characteristics. In FIG. 11, as in FIG. 10, the reflective film 66 is disposed in a strip shape on the slope of the recess 14 in the 6 o'clock direction, but the area where the reflective film 66 is disposed is reduced and the opening of the reflective film is increased. The emphasis is on transmission characteristics. As described above, the reflection and transmission characteristics can be controlled by controlling the arrangement area of the reflection film.

It is a figure which shows the 1st Example of the reflective substrate by this invention. 1 is a cross-sectional view of a liquid crystal display panel and a reflective substrate according to the present invention. It is a figure explaining the shape of a recessed part. It is a figure for defining the present invention more clearly. It is a figure explaining the light reflection characteristic of the reflective substrate by this invention, and the liquid crystal display panel using this reflective substrate. It is a figure which defines the term regarding the direction used in this specification. It is a figure which shows the 2nd Example of the reflective substrate by this invention. It is a figure which shows the 3rd Example of the reflective substrate by this invention. It is a figure explaining the manufacturing method of the reflective board | substrate 12 of this invention. It is a figure which shows the 4th Example of the reflective substrate by this invention. It is a figure which shows the 4th Example of the reflective substrate by this invention.

Explanation of symbols

a major axis b minor axis 14 concave portion 29 convex portion 28 resin film 66 reflective film 26 central point 30, 32, 34, 36, 38, 40 of concave portion lattice point 44, 46 central axis 12 reflective substrate 68 liquid crystal display panel

Claims (9)

A resin film provided with a concave portion or a convex portion having a shape having two orthogonal axes of a major axis and a minor axis;
A reflective substrate provided on the substrate with a reflective film on the resin film,
The center point of the concave or convex portion is arranged at a lattice point of a hexagonal close-packed lattice,
A line connecting each arbitrary lattice point and six adjacent lattice points is a central axis,
At least one central axis of the central axes is substantially parallel to the major axis direction of the concave portion or the convex portion,
The reflective board | substrate characterized by arrange | positioning the said recessed part or convex part.   The reflective substrate according to claim 1, wherein the lattice points are randomly moved.   The reflective substrate according to claim 1, wherein the shape or size of each of the concave portion or the convex portion is randomly changed. A liquid crystal display panel having a plurality of pixels with a liquid crystal sandwiched between a pair of substrates,
Of the pair of substrates, one substrate is a substrate provided with a resin film provided with a concave or convex portion having a shape in which the major axis and the minor axis are orthogonal to each other in the pixel, and a reflective film on the resin film. ,
The center point of the concave or convex portion is arranged at a lattice point of a hexagonal close-packed lattice,
A line connecting each arbitrary lattice point and six adjacent lattice points is a central axis,
At least one central axis of the central axes is substantially parallel to the major axis direction of the concave portion or the convex portion,
A liquid crystal display panel comprising the concave portion or the convex portion.   5. The liquid crystal display panel according to claim 4, wherein one central axis of the major axis direction of the concave portion or the convex portion and the central axis is substantially parallel to the direction of 3 o'clock to 9 o'clock.   The liquid crystal display panel according to claim 4, wherein the lattice points are randomly moved.   The liquid crystal display panel according to claim 4, wherein the shape or size of each of the concave portion or the convex portion is randomly changed. The liquid crystal display panel according to claim 4, wherein the reflective film is formed on a part of the concave portion or the convex portion.   The liquid crystal display panel according to claim 8, wherein the reflective film has a strip shape.

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