JP2005018726A - Transparent coordinate input device and transparent composite material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transparent coordinate input device and a transparent composite material capable of suppressing the deterioration of visual confirmability by the reflection of display light while suppressing interference fringes in an input operation. <P>SOLUTION: A number of ridges 45 extending in one direction are formed on the surface of a first transparent resistance film 31. The ridges 45 are, for example, protruding parts having triangular sectional shapes, and one set of an inclined surface 46a and an inclined surface 46b is alternately formed on the surface of the first transparent resistance film 31. A number of such narrow and slender inclined surfaces 46a and 46b generate extremely minute interference fringes which cannot be visually confirmed by human eyes on the surface of the resistance film 31 or the inclined surfaces 46a and 46b. The interference fringes become minute so as not to be visually confirmable by setting the pitch P of the ridges 45 sufficiently minute, and the presence of the interference fringes is apparently hardly recognized. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a transparent coordinate input device that directly inputs coordinates on a screen and a transparent composite material that constitutes the transparent coordinate input device.

  A portable information terminal typified by a PDA generally includes a coordinate input device for directly operating a display screen such as a liquid crystal display panel with a pen or a finger to select a menu or input data. . Such a coordinate input device is usually formed on a liquid crystal display panel, and is provided with a transparent coordinate input device for pointing and displaying the display of the liquid crystal display panel. As is well known, the transparent coordinate input device of the resistance film type widely used among the transparent coordinate input devices is a glass plate on which a transparent resistive film called ITO (Indium Tin Oxide) is formed on the surface of the liquid crystal display panel, A flexible transparent resin film such as PET (polyethylene terephthalate film) having a similar transparent resistance film formed on the surface is provided on the operation side. And it is a flat panel device made by arranging these two transparent resistive films facing each other with an insulating spacer or the like spaced apart.

  In such a transparent coordinate input device, when the input operation is performed by pressing the surface of the transparent coordinate input device with a pen or a finger, the transparent resin film on the operation side is slightly recessed, and an rainbow colored ring-shaped interference centering on the pressed portion. It is known that streaks occur. When such interference fringes occur, the visibility of the liquid crystal display panel decreases every time the transparent coordinate input device is operated, making it difficult to perform a smooth and comfortable input operation. In particular, since such interference fringes become more prominent as the size of the transparent coordinate input device increases, countermeasures against interference fringes have been strongly desired due to the recent increase in display screen size of portable information terminals.

In view of the current situation as described above, as a conventional countermeasure against interference fringes in a transparent coordinate input device, a transparent coordinate input device in which many fine protrusions are formed on the surface of a transparent resistive film on the liquid crystal display panel side or the operation side is known. . In such a transparent coordinate input device, the light that illuminates the liquid crystal display panel is diffused in multiple directions by fine protrusions formed on the surface of the transparent resistance film, so that the generation of interference fringes is suppressed. (For example, refer to Patent Document 1).
JP-A-8-281856

  However, the transparent coordinate input device in which a large number of fine protrusions are formed on the surface of the transparent resistance film on the liquid crystal display panel side or the operation side as described above, the individual protrusions each function as a fine lens. Many bright spots are formed by the display light of the display panel, and there is a problem that the display is glaring when the liquid crystal display panel is viewed from the outside of the transparent coordinate input device. There is also a problem that the liquid crystal display panel is not able to be observed clearly due to the lens effect of the individual protrusions and is blurred. Such glare and blurring caused by the conventional transparent coordinate input device has been a cause of lowering the visibility of the liquid crystal display panel.

  The present invention has been made in view of the above circumstances, and a transparent coordinate input device and a transparent device capable of suppressing the occurrence of interference fringes and blurring at the time of an input operation and also suppressing a decrease in visibility due to reflection of display light. The object is to provide a composite material.

  In order to achieve the above object, according to the present invention, a first transparent base material on which a first transparent resistance film is formed, and the first transparent base material face each other at an interval, and the first transparent resistance film A second transparent base material on which a second transparent resistance film facing the substrate is formed, and at least one of the first and second transparent resistance films has a plurality of flanges formed at a predetermined pitch. A featured transparent coordinate input device is provided.

  According to such a transparent coordinate input device, since the collar portion has a shape extending long in one direction, blur due to the lens effect does not occur, and an image can be clearly observed. In addition, illuminance unevenness due to the lens effect does not occur, and glare can be effectively prevented.

  The ridge part may be formed with a plurality of protrusions having a polygonal cross section composed of a plurality of surfaces inclined at different angles at a predetermined pitch. Such long extending ridges can effectively prevent the occurrence of blur and uneven illumination due to the lens effect.

  The formation pitch of the flanges is preferably set in the range of 100 to 5000 μm. Moreover, it is preferable that the height of the said collar part is set to the range of 0.1-10 micrometers. By setting the formation pitch of the collar part and the height of the collar part in such a range, when the surfaces of the first and second transparent bases are pressed, it is difficult for the human eye to visually recognize many collar parts. Very fine interference fringes are generated. By making the pitch of the collar sufficiently fine, the interference fringes generated in the transparent coordinate input device become so fine that they cannot be visually recognized, and apparently the presence of the interference fringes is hardly recognized.

  When the transparent coordinate input device described above is applied to a liquid crystal display device including a liquid crystal display panel, the visibility of the liquid crystal display device can be improved and an input operation can be performed with a clear display.

  The collar portion may be formed with intermittently protruding protrusions having a polygonal cross section in the extending direction. In addition, the flange portion may extend in a direction inclined at a constant angle with respect to each of the two orthogonal sides that partition the pixels of the liquid crystal display panel. Thereby, generation | occurrence | production of the interference fringe of a liquid crystal display device can be prevented.

  According to the transparent coordinate input device and the transparent composite material of the present invention, since the collar portion extends in one direction, generation of bright spots due to a fine lens effect is suppressed, and illuminance unevenness does not occur. It is possible to effectively prevent glare and blur. In addition, by making the pitch of the collar sufficiently fine, the interference fringes generated in the transparent coordinate input device become so fine that they cannot be visually recognized, and apparently the presence of the interference fringes is hardly recognized.

  Hereinafter, a liquid crystal display device including a transparent coordinate input device (transparent coordinate input switch) will be illustrated as an embodiment of the present invention. FIG. 1 is a sectional view of a liquid crystal display device provided with a transparent coordinate input device of the present invention. The liquid crystal display device 10 includes a front light (illumination device) 11, a liquid crystal display panel 12, and a transparent coordinate input device 13. The front light 11 includes a light guide plate 15 and a light source 16, and an incident surface 15a, an observation surface 15b, and an output surface 15c are formed on the light guide plate 15.

  The light source 16 is a rod-shaped light source provided along the incident surface 15a of the light guide plate 15, and specifically, a light emitting element such as a white LED (Light Emitting Diode) on one end surface or both end surfaces of the rod-shaped light guide. Those provided with are preferably used. However, the light source 16 can be used without any problem as long as it can introduce light into the light incident surface 15a in the light guide plate 15. For example, a light emitting element such as an LED is arranged along the light incident surface 15a of the light guide plate 12. You can also.

  The observation surface 15b of the light guide plate 12 is formed with a number of triangular wave-shaped grooves 17 that change the light introduced from the light source 16 toward the emission surface 15c. The groove 17 formed on the observation surface 15b is composed of a pair of slope portions, one slope is a gentle slope portion 17a, and the other is a reflective surface (steep slope portion) formed at a steeper slope than the gentle slope portion 17a. 17b. The shape of the observation surface 15b is not limited to the above shape, and any shape is possible as long as the light introduced from the incident surface 15a and propagating through the light guide plate 15 can be uniformly guided to the emission surface 15c. Good. Further, an AR lattice layer 18 that provides an antireflection effect is formed on the light exit surface 15 c of the light guide plate 12.

  In the liquid crystal display panel 12, a liquid crystal layer 23 is sandwiched between an upper substrate 21 and a lower substrate 22 that are arranged to face each other, and the liquid crystal layer 23 is provided in a frame shape along the inner peripheral edge of the substrates 21 and 22. The sealing material 24 is used for sealing. A liquid crystal control layer 26 is formed on the inner surface side (lower substrate 22 side) of the upper substrate 21, and illumination light and external light from the front light 11 are applied to the inner surface side (upper substrate 21 side) of the lower substrate 22. A reflective layer 25 having a metal thin film for reflection is formed, and a liquid crystal control layer 27 is formed on the reflective layer 25. The liquid crystal control layers 26 and 27 are configured to include an electrode for driving and controlling the liquid crystal layer 23, an alignment film, and the like, and also include a semiconductor element for switching the electrode. In some cases, a color filter may be provided.

  The liquid crystal display panel 12 shown in FIG. 1 is of a reflective type, and the display is performed by reflecting the illumination light incident from the front light 11 or external light incident from the outside by the reflection layer 25. As shown in FIG. 2, the reflective layer 25 is a highly reflective metal thin film such as aluminum or silver formed by sputtering or the like on an organic film 25a made of acrylic resin or the like having a concavo-convex shape formed on the surface. And a plurality of concave portions 25c are formed in the reflective film 25b. Furthermore, a planarizing film may be formed on the reflective film 25b with a silicon-based resin or the like in order to planarize the uneven shape on the surface.

  As the shape of the concave portion 25c, a smooth curved surface such as a spherical surface, a shape combining this curved surface and a flat surface, or the like can be applied. By adjusting the inclination angle of the inner surface and the pitch and depth of the concave portions, the liquid crystal It can be set as the reflection layer which has a suitable reflective characteristic according to the design of the electronic device provided with the display panel 12 as a display part. By providing the reflective layer 25 having the surface shape shown in FIG. 2, incident light can be efficiently reflected, and display with higher luminance can be performed. Further, when the incident light is outside light, regular reflection of light is prevented, and a bright and excellent display can be obtained. The liquid crystal display panel 12 may be a transflective type or a transmissive type other than the reflective type, and is not limited.

  Referring to FIG. 1, the transparent coordinate input device 13 includes two transparent composite materials 30a and 30b, and an insulating spacer 35 that separates the transparent composite material 30a and the transparent composite material 30b while maintaining a certain distance. ing. The transparent composite material 30a is composed of a plate-like first transparent base material 32 and a first transparent resistance film 31 covering one surface of the first transparent base material 32, and the transparent composite material 30b is a plate-like second transparent base material. It is comprised from the material 34 and the 2nd transparent resistance film 33 which covers one surface of the 2nd transparent base material 34 so that the 1st transparent resistance film 31 may be faced. The first transparent substrate 32 may be formed of a transparent PC (polycarbonate) resin having a thickness of, for example, about 0.5 to 1.5 mm, for example, about 1.0 mm. The first transparent substrate 32 covers the upper surface of the first transparent substrate 32. 1 The transparent resistance film 31 may be formed of a transparent conductive material such as ITO (indium tin oxide) having a thickness of 0.01 to 0.05 μm, for example, about 0.02 μm.

  The second transparent substrate 34 may be formed of a transparent PET (polyethylene terephthalate) resin having a thickness of about 170 μm, for example. The second transparent resistance film 33 covering the lower surface of the second transparent substrate 34 has a thickness of, for example, What is necessary is just to form from transparent conductive materials, such as about 0.02 micrometer ITO (indium Tin Oxide). An insulating spacer 35 having a thickness of about 100 μm is formed between the first transparent substrate 32 and the second transparent substrate 34, and the first transparent resistance film 31 and the second transparent resistance film 33 are spaced apart from each other at a constant interval. It is separated by.

  The operation principle of such a transparent coordinate input device 13 is as follows. As shown in FIG. 3A, the first transparent resistance film 31 is provided with a pair of electrodes 41a and 41b at both ends in the Y direction in FIG. 3, and the second transparent resistance film 33 is formed in FIG. A pair of electrodes 42a and 42b are formed at both ends in the X direction perpendicular to the Y direction by 90 °. The first transparent resistance film 31 and the second transparent resistance film 33 each have a uniform resistance value in the plane.

  For example, assuming that a point corresponding to S in FIG. 3 is selected by pressing the second transparent base material 34 with a pointing member such as a pen, the first transparent resistance film 31 is curved by the second transparent base material 34. And the second transparent resistance film 33 come into contact with each other at a point S and become electrically conductive. First, coordinates in the X direction are detected by applying a voltage applied between the electrodes 42a and 42b of the second transparent resistance film 33 to the second transparent resistance film 33 between the point S-electrode 42a and between the point S-electrode 42b. A potential gradient is formed in the X direction with resistance values RX1 and RX2 corresponding to the distance. By extracting the potential at the point S from the point S of the first transparent resistance film 31, the coordinate in the X direction at the point S of the transparent coordinate input device 13 is detected.

  Further, as shown in FIG. 3B, the detection of the coordinate in the Y direction is performed at the point S− on the first transparent resistance film 31 by the voltage applied between the electrodes 41a and 41b of the first transparent resistance film 31. A potential gradient is formed in the Y direction with resistance values RY1, RY2 corresponding to the distance between the electrodes 41a and between the point S-electrode 41b. By extracting the potential at the point S from the point S of the second transparent resistance film 33, the coordinate in the Y direction at the point S of the transparent coordinate input device 13 is detected.

  Thus, two-dimensional coordinate information of the pressing point S in the transparent coordinate input device 13 in the X direction and the Y direction is obtained. This so-called analog resistive film type transparent coordinate input device 13 has a feature that if the accuracy of the A / D converter is increased, the coordinate detection accuracy is improved. In addition to the analog resistive film method, the coordinate detection method of the transparent coordinate input device includes, for example, a large number of fine electrodes extending in the XY directions on the first transparent resistive film and the second transparent resistive film, and the contact point of this electrode. A so-called digital detection method may be used in which coordinates are detected from the continuity.

  FIG. 4 is an enlarged perspective view showing the transparent composite material 30a. On the surface of the first transparent resistance film 31, a large number of ridges (wires) 45 extending in one direction are formed. The flange portion 45 is a protrusion having a polygonal cross section, for example, a triangle, and a pair of inclined surfaces 46 a and inclined surfaces 46 b are alternately formed on the surface of the first transparent resistance film 31.

  The height H of the flange 45 may be formed in a cross-sectional triangle of 0.1 to 10 μm, for example, 3 μm, and the pitch P of the flange 45 may be formed at a pitch of 100 to 5000 μm, for example, 1000 μm. If a large number of flanges 45 are formed on the first transparent resistance film 31, the surface of the first transparent resistance film 31 is covered with a large number of long and narrow slopes 46a and 46b extending in a certain direction in the plane. The pitch P of the flange 45 may be set at random. For example, the pitch P of the flange 45 may change in the order of 500 μm, 1000 μm, 600 μm, and 700 μm.

  A large number of such narrow and long slopes 46a and 46b are formed on the surface of the first transparent resistance film 31 when the surface of the second transparent substrate 34 is pressed with an indicating member 49 such as a pen as shown in FIG. That is, extremely fine interference fringes that are difficult to see with human eyes are generated on the inclined surfaces 46a and 46b. By making the pitch P of the flange 45 sufficiently fine, the interference fringes generated in the transparent coordinate input device 13 become so fine that they cannot be visually recognized, and apparently the presence of the interference fringes is hardly recognized. One such interference fringe is generated at 0.25 μm (half wavelength of light). According to the transparent coordinate input device 13 of the present invention, for example, if the pitch P of the flange 45 is 1 mm, the height difference is 2 μm. Ten interference fringes are generated in a width of about 500 μm. Even if 10 interference fringes are generated in a width of about 500 μm, it is extremely difficult for human eyes to observe, and in practice, interference fringes cannot be recognized. The influence of fringes can be reliably eliminated. On the other hand, when the pitch P of the flange 45 is 100 μm or less, it is difficult to form the flange 45 with high accuracy. Therefore, if the pitch P of the flange 45 is set to 100 to 500 μm, it is possible to reliably prevent the presence of interference fringes. Furthermore, if the pitch P of the collar 45 is set at random, it is extremely difficult for human eyes to observe and the interference fringes have various sizes, so the influence of the interference fringes can be more reliably eliminated. .

  On the other hand, since the transparent coordinate input device 13 of the present invention is a surface in which the narrow slopes 46a and 46b extend long in one direction, a fine lens that forms an image at one point is not formed. Conventionally, a large number of fine protrusions each form a fine lens to generate a large number of bright spots, causing unevenness in the illuminance of the illumination light, causing glare. However, such a fine lens does not occur in the transparent coordinate input device 13 of the present invention in which a large number of flange portions 45 extending in one direction are formed on the surface of the first transparent resistance film 31. In addition, a large number of fine protrusions as in the prior art, each of which formed a fine lens and caused blurring, but the transparent portion of the present invention in which a flange 45 extending long in one direction was formed. The coordinate input device 13 can prevent such blurring and observe a clear image.

  As described above, when the object or the like displayed on the liquid crystal display panel 12 by the transparent coordinate input device 13 of the present invention is indicated by the pointing member 49, the first transparent resistance film 31 and the second transparent resistance film 33 are in contact at one point. Then conduct. At that time, the second transparent base material 34 bends downward and interference fringes are generated. However, the interference fringes generated by the inclined surfaces 46a and 46b constituting the fine flange 45 extending long in one direction are applied to the human eye. It can be made so fine that it cannot be recognized. Therefore, the object displayed on the liquid crystal display panel 12 can be clearly observed via the transparent coordinate input device 13 without being obstructed by the interference fringes. In addition, since the slopes 46a and 46b constituting the collar portion 45 are long surfaces extending in one direction, generation of bright spots and blur due to a fine lens effect can be suppressed, and unevenness in illumination intensity of illumination light does not occur. The liquid crystal display panel 12 can be observed with a clear image quality free from glare and blur.

  In forming the flange portion 45, a transparent resin constituting the first transparent base material 32 is injection-molded using a mold that preliminarily represents the outer shape of the flange portion 45, and a first transparent having a flange portion on the surface thereof. If the first transparent resistance film 31 made of ITO is formed on the base material 32, the transparent composite material 30b having a large number of flanges 45 on the surface of the first transparent resistance film 31 can be obtained. Further, the surface of the first transparent substrate is formed flat, the first transparent resistance film is formed thick on the flat first transparent substrate, and the first transparent resistance film is formed by a technique such as etching. You may cut and form many fine collar parts extended in one direction.

  You may form the collar part which makes an interference fringe invisible on the transparent composite material side used as the operation side of a transparent coordinate input device. As shown in FIG. 6, the transparent coordinate input device 51 includes two transparent composite materials 52a and 52b. The transparent composite material 52 a includes a first transparent base material 53 and a first transparent resistance film 54, and the transparent composite material 52 b includes a second transparent base material 55 and a second transparent resistance film 56. Among these, on the surface of the second transparent resistance film 56 of the transparent composite material 52b that is directly pressed by the indicating member 49 or the like, a large number of fine flange portions 57 extending in one direction are formed. Such a flange portion 57 may be a protrusion having a triangular cross section composed of a large number of slanted surfaces 57a and 57b having a narrow width.

  When the surface of the second transparent base material 55 is pressed by the indicating member 49, the collar portion 57 generates extremely fine interference fringes that are difficult to see by human eyes on the surface of the second transparent resistance film 56, that is, the inclined surfaces 57a and 57b. Let By making the pitch of the flanges 57 sufficiently fine, the interference fringes generated in the transparent coordinate input device 51 become so fine that they cannot be visually recognized, and apparently the presence of the interference fringes is hardly recognized. In addition, since the inclined surfaces 57a and 57b constituting the flange portion 57 are long surfaces extending in one direction, generation of bright spots and blurs due to a fine lens effect can be suppressed, and unevenness in illumination intensity of illumination light does not occur. It is possible to effectively prevent glare and blur.

  You may form the collar part which makes an interference fringe invisible in both sets of a transparent composite material. As shown in FIG. 7, the transparent coordinate input device 61 includes two transparent composite materials 62a and 62b. The transparent composite material 62a includes a first transparent base material 63 and a first transparent resistance film 64, and the transparent composite material 62b includes a second transparent base material 65 and a second transparent resistance film 66. On the surfaces of the first transparent resistance film 64 and the second transparent resistance film 66 that are formed on the transparent composite materials 62a and 62b and face each other, a large number of fine flange portions 67 and 68 extending in one direction are formed. The flanges 67 and 68 may be ridges having a triangular cross section composed of a large number of long and narrow slopes 67a and 67b and slopes 68a and 68b.

  When the surface of the second transparent substrate 65 is pressed by the indicating member 49, the flange portions 67 and 68 are applied to the surfaces of the first transparent resistance film 64 and the second transparent resistance film 66, that is, the slopes 67a and 67b and the slopes 68a and 68b. It generates extremely fine interference fringes that are difficult to see with the human eye. By making the pitches of the flanges 67 and 68 sufficiently fine, the interference fringes generated in the transparent coordinate input device 61 become so fine that they cannot be visually recognized, and apparently the presence of the interference fringes is hardly recognized. In addition, since the slopes 67a and 67b and the slopes 68a and 68b constituting the flange portions 67 and 68 are long surfaces extending in one direction, generation of bright spots and blurs due to a fine lens effect can be suppressed, and illumination intensity of illumination light This makes it possible to prevent glare and blur effectively.

  The collar portion that makes the interference fringes invisible may have a shape that extends while being curved. As shown in FIG. 8, the transparent composite material 71 includes a transparent base material 72 and a transparent resistance film 73. On the surface of the transparent resistance film 73, a large number of fine ridges 74 having a triangular cross section and extending in a curved manner are formed. Such a collar 74 generates very fine interference fringes that are difficult to see with human eyes. By sufficiently narrowing the formation pitch of the flanges 74, the interference fringes become so fine that they cannot be visually recognized, and apparently the presence of the interference fringes is hardly recognized. In addition, since the collar portion 74 extends in one direction and is composed of a curved fine surface, generation of bright spots and blur due to a fine lens effect is suppressed, and unevenness in illumination light illumination does not occur. It is possible to effectively prevent glare and blur.

  The collar portion that makes the interference fringes invisible may be a narrow curved surface that extends long in one direction. As shown in FIG. 9, the transparent composite material 81 includes a transparent base material 82 and a transparent resistance film 83. On the surface of the transparent resistance film 83, a large number of fine ridges 84 having a curved surface with a semi-elliptical cross section are formed. By making the formation pitch of the flanges 84 sufficiently fine, the interference fringes become so fine that they cannot be visually recognized, and apparently the presence of the interference fringes is hardly recognized. Further, in this embodiment, since the collar portion 84 is curved and extended in one direction, the occurrence of interference fringes can be effectively prevented when applied to a liquid crystal display device.

  The collar portion that makes the interference fringes invisible may be a narrow curved surface that extends long in one direction. As shown in FIG. 10, the transparent composite material 91 includes a transparent base material 92 and a transparent resistance film 93. On the surface of the transparent resistance film 93, a large number of fine ridges 94 having a triangular cross section and a curved top are formed. Such a collar 94 generates extremely fine interference fringes that are difficult to see with human eyes. By making the formation pitch of the flanges 94 sufficiently fine, the interference fringes become so fine that they cannot be visually recognized, and apparently the presence of the interference fringes is hardly recognized. In addition, since the collar portion 94 extends in one direction, generation of bright spots and blur due to a fine lens effect is suppressed, and unevenness in illumination intensity of illumination light does not occur, and glare and blur are effectively prevented. It becomes possible to prevent.

  The flange portion that makes the interference fringes invisible may be formed with intermittent protrusions having a rectangular cross section in the extending direction. As shown in FIG. 11, a large number of fine ridges 102 having a rectangular cross section are formed on the surface of the transparent composite material 101. The flanges 102 are intermittently formed with a certain length in the extending direction of the flanges 102 indicated by the arrow L in the figure, and fine gaps 103 are formed between the individual flanges 102. Further, the flanges 102 adjacent to each other in the direction orthogonal to the arrow L are formed so as to be shifted by a half width of the length in the extending direction of each flange 102. It is preferable that the extending direction L of such a flange 102 is inclined at a certain angle θ with respect to the extending direction E of the edges constituting the pixels of the liquid crystal display panel.

  The interference fringes generated in the flange 102 are so fine that they cannot be visually recognized, and apparently the presence of the interference fringes is hardly recognized. By inclining the extending direction L of the flange 102 with respect to the extending direction E of the edges constituting the pixels of the liquid crystal display panel at a constant angle θ, the interference fringes can be made even more invisible. In addition, as shown in FIG. 12, the flanges 105 adjacent to each other in the direction orthogonal to the arrow L are formed while the flanges 105 are intermittently formed in a certain length in the extending direction indicated by the arrow L in the drawing. The transparent composite material 107 may be formed so as to be aligned with each other.

  As shown in FIG. 13, on the surface of the transparent composite material 111, fine ridges 112 having a triangular cross section are formed intermittently at a constant length in the extending direction indicated by the arrow L in the figure, and the arrow L and For example, four ridges 112 adjacent to each other in the orthogonal direction may be formed together. Further, as shown in FIG. 14, a fine ridge part 122 having a triangular cross section is extended on the surface of the transparent composite material 121 in the extending direction indicated by an arrow L in the figure so as to intermittently form fine streaks 123. Anyway.

  In the above-described embodiment, an example in which a front light is provided as an illumination device that illuminates the liquid crystal display panel has been described, but a backlight may be used as the illumination device. As shown in FIG. 15, in this embodiment, a backlight 130 is provided as an illumination device that illuminates the liquid crystal display panel 12. The backlight 130 includes a light source 131 having a built-in light emitting element, a light guide plate 132 that introduces light from the light source 131 into the inside from the side end surface 132a and emits light from the light source 131 propagating through the light emitting surface 132b. And a lens sheet 133 formed on the light exit surface 132b of the light guide plate 132.

  The liquid crystal display panel 12 may be of a transmissive or transflective type so that light emitted from the backlight 130 can be transmitted to an observer. Further, polarizing plates 134 and 135 are formed on at least one of the observation surface side and the backlight side of the liquid crystal display panel 12. The liquid crystal display panel 12 and the transparent coordinate input device 13 may be bonded with, for example, a transparent double-sided tape 136.

  In addition, the transparent composite material is provided with a collar portion on the surface of the transparent composite material by forming a collar portion on the transparent base material constituting the transparent composite material and forming a transparent resistance film on the transparent base material. Alternatively, a collar may be formed on the transparent resistive film itself, and the collar may be provided on the surface of the transparent composite material. Further, an intermediate material in which a collar portion is formed between the transparent substrate and the transparent resistance film may be formed, and the collar portion may be provided on the surface of the transparent composite material. The buttocks may be formed at a random pitch.

FIG. 1 is a cross-sectional view showing a liquid crystal display device which is an embodiment of the transparent coordinate input device of the present invention. FIG. 2 is an enlarged perspective view showing a reflective layer of the liquid crystal display device. FIG. 3 is an explanatory diagram showing a mechanism for specifying input coordinates of the transparent coordinate input device. FIG. 4 is an enlarged perspective view showing the transparent composite material of the present invention. FIG. 5 is a cross-sectional view showing the operation of the transparent coordinate input device of the present invention. FIG. 6 is a cross-sectional view showing another embodiment of the transparent coordinate input device of the present invention. FIG. 7 is a cross-sectional view showing another embodiment of the transparent coordinate input device of the present invention. FIG. 8 is an enlarged perspective view showing another embodiment of the transparent composite material of the present invention. FIG. 9 is an enlarged perspective view showing another embodiment of the transparent composite material of the present invention. FIG. 10 is an enlarged perspective view showing another embodiment of the transparent composite material of the present invention. FIG. 11 is a cross-sectional view showing another embodiment of the transparent coordinate input device of the present invention. FIG. 12 is an enlarged perspective view showing another embodiment of the transparent composite material of the present invention. FIG. 13 is an enlarged perspective view showing another embodiment of the transparent composite material of the present invention. FIG. 14 is an enlarged perspective view showing another embodiment of the transparent composite material of the present invention. FIG. 15 is a sectional view showing another embodiment of the transparent coordinate input device of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid crystal display device 12 Liquid crystal display panel 13 Transparent coordinate input device 30a, 30b Transparent composite material 31 1st transparent resistive film 32 1st transparent base material 33 2nd transparent resistive film 34 2nd transparent base material 35 Insulating spacer 45 ridge part 130 Backlight

Claims (8)

  A first transparent base material on which the first transparent resistance film is formed, and a second transparent base film on which the second transparent resistance film facing the first transparent resistance film is formed facing the first transparent base material with a space therebetween A transparent coordinate input device comprising: a base material; and a plurality of eaves portions formed at a predetermined pitch on at least one of the first and second transparent resistance films.   2. The transparent coordinate input device according to claim 1, wherein a plurality of protrusions having a polygonal cross section composed of a plurality of surfaces inclined at different angles are formed on the flange portion at a predetermined pitch.   The transparent coordinate input device according to claim 1, wherein a formation pitch of the collar portion is set in a range of 100 to 5000 μm.   The transparent coordinate input device according to any one of claims 1 to 3, wherein the height of the collar portion is set in a range of 0.1 to 10 µm.   A liquid crystal display device comprising: the transparent coordinate input device according to claim 1; and a liquid crystal display panel.   A transparent composite comprising a transparent base material and a transparent composite film having a transparent resistance film formed on the surface of the transparent base material, wherein a plurality of ridges are formed at a predetermined pitch on the surface of the transparent composite material Wood.   2. The transparent coordinate input device according to claim 1, wherein the collar portion is formed by intermittently forming protrusions having a polygonal cross section in an extending direction thereof.   The liquid crystal display device according to claim 5, wherein the flange extends in a direction inclined at a constant angle with respect to each of the two orthogonal sides defining the pixel of the liquid crystal display panel.

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