JP2012256291A - Display device and input system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device with high reliability in which wearing of a position information pattern accompanying a handwriting input is prevented, and further to provide an input system.SOLUTION: A display device 3 capable of displaying handwriting input by using an input device comprises: a display section 35 for displaying the handwriting; and a position information pattern 34a that is disposed at a display surface 35a side of the display section 35 and specifies position information of a tip portion in the input device. The position information pattern 34a is formed inside a transparent layer 34A disposed on the display surface 35a and is constituted by a prism P capable of retro-reflecting illumination light illuminated from the input device.

Description

  The present invention relates to a display device and an input system.

  In recent years, a display device having a thin and lightweight device called electronic paper has been put into practical use. The reflective display system that reflects external light diffusely reduces power consumption compared to self-luminous display devices such as transmissive liquid crystal display devices and EL displays that have a backlight. The display device can be reduced in size and weight.

  A representative example of an electronic paper display device is an electrophoresis display device. In addition, in electronic paper, it is desirable to be able to input handwritten characters using an input device or to intuitively operate a display device. As a thin and lightweight input device suitable for electronic paper, an optically readable position information pattern layer is provided on the display surface of the electronic paper, and the position information pattern is imaged by an imaging unit installed on the pointer. A technique for specifying an indicated position on a display surface of electronic paper is disclosed (for example, see Patent Document 1).

  This input method is an input device suitable for thin and light electronic paper because an input function can be added only by adding a position information pattern layer to the display device. In this display device, an infrared light reflection layer is provided between the position information pattern layer and the display device in order to prevent the display information from being mixed with the position information pattern layer and the position information pattern image. ing.

  Moreover, the technique formed by printing the ink containing the material which retroreflects invisible light as the said positional information pattern is disclosed (for example, refer patent document 2). In this technique, since the reflected light of the position information pattern does not diffuse because the pattern is retroreflected, strong reflected light can be obtained, and at the same time, the viewing angle characteristics are excellent.

JP 2008-21168 A JP 2008-268585 A

  However, in the above prior art, it is necessary to form the pattern on the surface layer in contact with air in order to obtain a predetermined refraction angle in the glass beads as the retroreflective material contained in the pattern. Therefore, the pointer used as the input device comes into direct contact with the pattern. In this case, it is difficult to ensure the strength against the friction caused by the pointer, and the pattern peels off due to the friction of the pointer, resulting in a problem that the reliability of the display device is lowered.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a highly reliable display device and input system in which wear of a position information pattern accompanying handwriting input is prevented.

  In order to solve the above problems, a display device of the present invention is a display device capable of displaying a handwritten handwriting input using an input device, the display unit displaying the handwriting, and the display unit A position information pattern that is provided on a display surface side and defines position information of a tip portion of the input device, and the position information pattern is formed inside a transparent layer provided on the display surface, It is characterized by comprising a prism capable of retroreflecting illumination light illuminated from the input device.

  According to the display device of the present invention, since the position information pattern is composed of the prism formed inside the transparent layer, it is possible to prevent the input device and the position information pattern from coming into direct contact. Therefore, it is possible to prevent the occurrence of a problem that the position information pattern cannot be well defined with the input device due to wear of the position information pattern due to contact with the input device. Therefore, it is possible to provide a highly reliable display device in which wear of the position information pattern due to handwriting input is prevented.

In the display device, it is preferable that the prism is formed by processing a transparent resin substrate constituting the transparent layer, and an air layer is interposed between the prism and the display surface.
According to this configuration, since the transparent layer is formed of the transparent resin substrate, for example, when an external pressure is applied, the transparent layer is bent together with the display unit, and an air layer interposed between the prism and the display unit is secured. Therefore, the retroreflective property generated at the interface between the prism and the air layer can be stably secured.

In the display device, it is preferable that the surface of the transparent layer is subjected to antireflection processing in a region excluding the prism in a plan view.
In general, the anti-reflection process includes an anti-glare process such as a concavo-convex process. Therefore, if the present invention is adopted, it is possible to prevent the diffusion of illumination light by reducing the haze value directly above the prism, and it is possible to generate the retroreflection well while suppressing the light reflection on the entire display surface. it can.

In the display device, it is preferable that the position information pattern has a plurality of dots, and each dot is constituted by a plurality of the prisms.
According to this configuration, since the position information pattern is composed of a plurality of prisms, it is possible to increase the amount of light reflected to the input device side by retroreflection.

Moreover, in the said display apparatus, it is preferable that the said transparent layer is provided in the said display surface through the contact bonding layer.
According to this configuration, the adhesive layer provided between the transparent layer and the display surface can function as a buffer layer.

  An input system according to the present invention includes the display device described above and an input device that inputs information related to handwriting by handwriting.

  According to the input system of the present invention, since the highly reliable input device is provided in which the wear of the position information pattern due to handwriting input is prevented, the input system itself is also highly reliable.

It is a figure which shows schematic structure of an electronic paper system. It is a block diagram which shows concretely the electric constitution of an electronic paper system. It is a figure which shows schematic structure of a positional information pattern layer. (A), (b) is an enlarged view which shows the principal part of a positional information pattern layer. It is a figure which shows schematic structure of an electrophoresis apparatus. It is a figure which shows the structure of the corner cube prism which concerns on a modification.

  Hereinafter, an embodiment according to an input device, an input system, and an electronic apparatus of the present invention will be described. FIG. 1 is a diagram showing a configuration according to an input system including an input device of the present invention. FIG. 1 shows a schematic configuration of an electronic paper system as an example of an input system.

  As shown in FIG. 1, the electronic paper system 1 includes a housing 2, a display device 3 disposed in an opening 2 a provided in the housing 2, and an input device that inputs predetermined information to the display 3. 4 is provided. The electronic paper system 1 displays an image corresponding to the handwriting on the display device 3 when the user inputs handwritten handwriting on the display device 3 using the input device 4 as described later.

  FIG. 2 is a block diagram specifically showing the electrical configuration of the electronic paper system 1. As shown in FIG. 2, the display device 3 includes a display body module 30, a display body drive control unit 31, a display device control unit 32, and a display device wireless communication unit 33. The display module 30 includes a position information pattern layer 34 and a display unit 35 configured by an electrophoretic display device.

  As shown in FIG. 2, the display module 30 is formed by laminating a position information pattern layer 34 on the upper surface of the display unit 35. The position information pattern layer 34 includes a substrate 34A made of a transparent resin as a base material, and a position information pattern 34a (see FIG. 3) formed on the substrate 34A. The substrate 34A has a property of transmitting the display light (visible light) of the display unit 35.

  The position information pattern 34a is a position information pattern (pattern obtained by encoding position information) using a dot code or the like, and the surface of the display unit 35 provided with the position information pattern 34a by detecting the position information pattern 34a. The position on the top can be defined uniquely. As such a method, for example, JP 2006-277492 A and JP 2006-127081 can be exemplified.

  The input device 4 includes a position detection unit 41 and an input device wireless communication unit 42, and is used for detecting an input operation such as handwritten input by the user on the display device 3. Like the touch pen and the stylus, the input device 4 is configured to be used when the user holds it with a hand. That is, the input device 4 is physically separated from the display device 3.

  In this way, the position detection method for optically reading the position information pattern layer 34 can reduce the component parts of the display device 3 by reducing the input device 4 and the display device 3, thereby reducing the weight and thickness. Therefore, the form of the display device 3 suitable for the electronic paper system 1 can be realized.

  The position detection unit 41 of the input device 4 includes an illumination unit 50, an imaging unit 51, an image processing unit 52, and a position information detection unit 53. The illumination part 50 is comprised from LED or a light bulb arrange | positioned at the front-end | tip of the input device 4, and irradiates the light containing a near infrared ray. When the front end of the input device 4 held by the user indicates the surface of the display unit 35 of the display module 30, the illumination unit 50 applies light to the position information pattern 34a (see FIG. 3) of the position information pattern layer 34. It comes to irradiate.

  To detect the position where the input device 4 is touching the display unit 35 of the display module 30, the light irradiated from the illumination unit 50 and reflected by the position information pattern 34a formed on the display unit 35 is optically detected. The position detection method to read is adopted. Specifically, the input device 4 is configured such that the imaging unit 51 captures the reflected light from the position information pattern 34a in a state where the tip portion indicates the surface of the display unit 35 of the display module 30 while being held by the user. It has become. The input device 4 can detect the position on the top surface of the display unit 35 at the tip of the input device 4 by processing the image information captured by the imaging unit 51.

  The imaging unit 51 is configured by an imaging element (CCD) disposed at a substantially distal end of the input device 4. The imaging unit 51 images a predetermined area of the position information pattern layer 34 and converts it into an electrical signal, and transmits the converted electrical signal to the image processing unit 52. An imaging optical system (not shown) for forming an image of the display surface on the imaging surface of the imaging device is provided near the entrance where the light enters the imaging unit 51, and light in the wavelength band of infrared light. The filter member which permeate | transmits only is provided. As a result, the imaging unit 51 can capture an image based on the position information pattern 34 with a high S / N ratio.

  3 is a diagram showing a schematic configuration of the position information pattern layer 34, FIG. 3A is a diagram showing a cross-sectional configuration, and FIG. 3B is a diagram showing a planar configuration. As shown in FIG. 3A, the position information pattern layer 34 is provided on the upper surface of the display unit 35 via the adhesive layer 70. The adhesive layer 70 preferably has a refractive index substantially equal to that of the display unit 35.

  The position information pattern 34a is composed of a corner cube prism P formed inside the substrate 34A. The corner cube prism has an air layer K that is a space in which air is stored between the upper surface of the display unit 35, that is, the display surface 35a. As shown in FIG. 3B, the corner cube prism P is composed of an outer surface of a triangular pyramid formed by combining three planes that reflect light at right angles to each other. Predetermined light incident on the prism surface is reflected three times on a flat surface, and as a result, the light is reflected in a direction that is turned 180 degrees from the direction in which the light originally entered (retroreflectivity). That is, the corner cube prism P has a characteristic of retroreflecting light.

  The size of the corner cube prism P is, for example, about 30 μm on one side. The corner cube prism P is directly formed on the substrate 34A by using, for example, press working or nanoimprint technology.

  Since the corner cube prism P is formed inside the substrate 34A, even when the input device 4 is in contact with the surface of the position information pattern layer 34, direct contact is prevented. That is, it is possible to prevent the occurrence of a problem that the position information pattern 34a is worn due to contact with the input device 4.

Claim 2
By the way, the position information pattern layer 34 may be pressed and deformed by contact with the input device 4. Since the substrate 34A constituting the position information pattern layer 34 has flexibility, for example, even when the substrate 34A is bent together with the display unit 35 by an external pressure by the input device 4, it is between the corner cube prism P and the display unit 35. An intervening air layer K is secured. Therefore, the retroreflective property generated at the interface between the corner cube prism P and the air layer can be stably secured.

  Further, the adhesive layer 70 provided between the position information pattern layer 34 and the display portion 35 can function as a buffer layer. Thereby, damage to the position information pattern layer 34 and the display unit 35 due to external pressure can be reduced.

  When the position information pattern layer 34 is pressed, the adhesive layer 70 may enter the space under the corner cube prism P, and there is a possibility that an air layer cannot be secured under the corner cube prism P. In this case, the refractive index at the interface of the corner cube prism P changes, and the retroreflection characteristics change.

  Therefore, in this embodiment, a sufficient height d1 of the space for securing the air layer K under the corner cube prism P is ensured. That is, even when the position information pattern layer 34 is deformed, the substrate 34A having a thickness capable of forming the corner cube prism P is used so that the air layer K can be secured in the space. For example, if the thickness of the substrate 34A is 0.5 mm, the display unit 35 can be prevented from being damaged due to the pressing of the input device 4, and the air layer K can be secured as described above.

  4A and 4B are diagrams illustrating the configuration of the display surface of the display device 3, in which FIG. 4A illustrates a cross-sectional configuration and FIG. 4B illustrates a planar configuration. The display device 3 is subjected to anti-glare treatment (unevenness treatment) in order to prevent light reflection on the surface, like a general display module. In the present embodiment, as shown in FIG. 4A, a concavo-convex portion 34B by anti-glare processing is formed on the surface side (the side opposite to the display portion 35) of the substrate 34A constituting the position information pattern layer 34.

  Here, since the anti-glare processing surface also diffuses the infrared light illuminated by the illumination unit 50 of the input device 4, the light reaching the imaging unit 51 of the input device 4 via the corner cube prism P also diffuses. As a result, the amount of light decreases and the detection accuracy of the position information pattern 34a decreases.

  Therefore, the substrate 34A according to the present embodiment forms the uneven portion 34B only in a region that does not overlap the corner cube prism P in plan view. That is, while reducing the haze value in the formation area A1 of the corner cube prism P and increasing the haze value of the non-formation area A2 of the corner cube prism P, while suppressing light reflection on the entire display screen of the display device 3, Retroreflection at the position information pattern layer 34 can be favorably generated.

  In the present embodiment, since the corner cube prism P is employed as the position information pattern 34a as described above, the illumination light emitted from the input device 4 (illumination unit 50) is retroreflected to cause the tip of the input device 4 to move. The imaging unit 51 provided in the unit can capture an image with high brightness.

  The image processing unit 52 extracts the component of the position information pattern 34a in the position information pattern layer 34 by digitally processing the image indicated by the electric signal sent from the image pickup unit 51 and sends it to the position information detection unit 53. It is. The position information detection unit 53 can acquire position information by using the above-described method from the arrangement characteristics of the position information pattern 34a.

  In addition, the position detection unit 41 transmits the position information acquired by the position information detection unit 53 to the input device wireless communication unit 42. The input device wireless communication unit 42 can transmit the received position information to the display device 3 side by a wireless method.

  Based on such a configuration, the input device 4 detects information (for example, coordinates) related to the position in contact with the display surface (display unit 35) of the display body module 30 based on the position information pattern layer 34, and the detected position coordinates. Information can be output from the input device wireless communication unit 42 to the display device control unit 32 via the display device wireless communication unit 33. On the other hand, the display device 3 can control the display state of the display unit 35 via the display body drive control unit 31 based on the position coordinate information detected by the position detection unit 41 by the display device control unit 32.

  Therefore, in the electronic paper system 1 according to the present embodiment, the trajectory when the input device 4 moves while contacting the display module 30 is displayed on the display unit 35, and the state of handwriting input or the like is displayed on the display unit 35 as needed. It can be displayed.

  FIG. 5 is a diagram showing a schematic configuration of the electrophoresis apparatus constituting the display unit 35. In FIG. 5, illustration of the adhesive layer 70 for attaching the position information pattern layer 34 to the display unit 35 is omitted. As shown in FIG. 5, the display unit 35 fixes a microcapsule 65 provided between a pair of electrodes including the pixel electrode 23 and the transparent electrode 24, and fixes the microcapsule 65 between the electrodes 23 and 24. And a binder layer 61. The microcapsule 65 contains an electrophoretic dispersion liquid 60 including the liquid phase dispersion medium 26 and the electrophoretic particles 25.

  In the present embodiment, the electrophoretic device converts the electrophoretic dispersion liquid 60 into microcapsules 65, thereby facilitating the handling, simplifying the manufacturing process, and displaying by the uneven distribution of the electrophoretic particles 25. To prevent non-uniformity.

  As the liquid phase dispersion medium 26, an organic solvent having a relatively high insulating property can be used. Examples of the organic solvent include aromatic hydrocarbons such as toluene, xylene and alkylbenzene, aliphatic hydrocarbons such as pentane, hexane and octane, alicyclic hydrocarbons such as cyclohexane and methylcyclohexane, and methylene chloride. , Halogenated hydrocarbons such as chloroform, carbon tetrachloride, 1,2-dichloroethane, various mineral oils such as silicon oil, fluorine oil, olive oil and vegetable oils, higher fatty acid esters, etc. It can be used by mixing.

  As the electrophoretic particles 25, organic or inorganic pigment particles or composites containing these can be used. In the present embodiment, two types of particles capable of displaying white and black are used as the electrophoretic particles 25.

  The pixel electrode 23 is formed on the first substrate 11, and the transparent electrode 24 is formed on the second substrate 12. That is, the first substrate 11 and the second substrate 12 face each other and sandwich the microcapsule 65, the binder layer 61, the pixel electrode 23, and the transparent electrode 24.

  The first substrate 11 may be either flexible or hard, but is preferably flexible. By using the first substrate 11 having flexibility, the display unit 35 having flexibility is obtained. Thereby, an electrophoresis apparatus useful for constructing the flexible electronic paper system 1 can be obtained. The first substrate 11 is made of an insulating material. Examples of such an insulating material include polyimide, polyether ether ketone, polyethylene naphthalate, polyether sulfone, polyethylene terephthalate, and polyethylene. These can be used alone or in combination of two or more.

  A plurality of pixel electrodes 23 are provided on one inner surface (the upper surface in FIG. 5) of the first substrate 11. Each pixel electrode 23 functions as one electrode for applying a voltage to the electrophoretic dispersion liquid 60 in the microcapsule 65. Examples of the constituent material of the pixel electrode 23 include metals such as aluminum, nickel, cobalt, platinum, gold, silver, copper, molybdenum, titanium, and tantalum, or alloys containing these, and one of these is used. Species or a combination of two or more can be used.

  On the other hand, the transparent electrode 24 is disposed on the lower surface (the lower surface in FIG. 5) of the second substrate 12 provided to face the first substrate 11. The second substrate 12 is preferably flexible in the same manner as the first substrate 11, and examples of the constituent material thereof include various cellulose resins, polyethylene terephthalate (PET), and polyethylene naphthalate (PEN). And various resin materials such as polyester resin, polyethylene resin, polystyrene resin, polyvinyl chloride resin, polycarbonate (PC), polyethersulfone (PES), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), and the like. Of these, one or two or more of these can be used in combination.

  The second substrate 12 and the transparent electrode 24 are both light-transmitting, preferably substantially transparent (colorless transparent, colored transparent or translucent). Thereby, as described later, the state of the electrophoretic particles 25 in the electrophoretic dispersion liquid 60, that is, the information displayed on the display unit 35 can be easily recognized visually.

As a constituent material of the transparent electrode 24, for example, in addition to conductive metal oxides such as indium tin oxide (ITO), fluorine-doped tin oxide (FTO), indium oxide (IO), tin oxide (SnO ₂ ), Examples thereof include conductive resins such as polyacetylene, conductive resins containing conductive metal fine particles, and the like, and one or more of these can be used in combination. The pixel electrode 23 described above can also be configured using such a material.

  Examples of the binder material constituting the binder layer 61 include polyethylene, chlorinated polyethylene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, polypropylene, ABS resin, methyl methacrylate resin, vinyl chloride resin, Vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride acrylate copolymer, vinyl chloride-methacrylic acid copolymer, vinyl chloride-acrylonitrile copolymer, ethylene-vinyl alcohol-chloride Vinyl copolymers, propylene-vinyl chloride copolymers, vinylidene chloride resins, vinyl acetate resins, polyvinyl alcohol, polyvinyl formal, cellulose resins and other thermoplastic resins, polyamide resins, polyacetals, polycarbonates, polyethylene terephthalates Polymers such as poly (butylene terephthalate), polybutylene terephthalate, polyphenylene oxide, polysulfone, polyamideimide, polyaminobismaleimide, polyethersulfone, polyphenylenesulfone, polyarylate, grafted polyfinylene ether, polyetheretherketone, polyetherimide Fluorine-based resins such as fluorinated ethylene, polyfluorinated ethylene propylene, tetrafluoroethylene-perfluoroalkoxyethylene copolymer, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, polytrifluoroethylene chloride, and fluororubber Silicone resin such as silicone resin and silicone rubber, and other resin materials such as methacrylic acid-styrene copolymer, polybutylene, methyl methacrylate-butadiene-styrene copolymer Gerare can be used singly or in combination of two or more of them.

  Based on such a configuration, the display unit 35 changes the distribution state of the electrophoretic particles 25 by applying a voltage to the electrophoretic dispersion liquid 60 in the microcapsule 65 by the electrodes 23 and 24, thereby displaying the display unit. It is supposed to function as. Specifically, in the present embodiment, the distribution state of the electrophoretic particles 25 in the microcapsule 65 is changed by moving the black and white electrophoretic particles 25 to the first substrate 11 and the second substrate 12 side, respectively. Black or white display can be performed for each pixel.

  By the way, since the infrared light irradiated by the illumination unit 50 is also reflected by the display unit 35, the reflected light of the infrared light from the display unit 35 is added to the image captured by the imaging unit 51 in addition to the position information pattern layer 34. May be included.

  Specifically, the electrophoretic display device constituting the display unit 35 according to the present embodiment includes white particles and black particles as the electrophoretic particles 25 as described above, and is configured to be capable of monochrome display. In general, since white particles are made of a material having a wide light reflection wavelength range such as titania, not only visible light but also infrared light that is a detection wavelength region of the position information pattern 34a is reflected. In addition, the reflected light of the display unit 35 passes through the position information pattern layer 34 and enters the imaging unit 51. As described above, the amount of imaging light detected by the image sensor of the imaging unit 51 varies depending on the display state of the display unit 35, and may cause noise when extracting the component of the position information pattern 34a.

  On the other hand, in the display device 3 according to the present embodiment, since the position information pattern 34a of the position information pattern layer 34 is composed of the corner cube prism as described above, the brightness of reflected light is high due to retroreflection. It becomes. Therefore, even when the light incident on the imaging unit 51 includes reflected light of infrared light from the electrophoretic particles 25 (white particles), the reflected light from the position information pattern layer 34 has higher luminance. By determining the brightness of the captured image, the components of the position information pattern 34a can be extracted satisfactorily.

  Subsequently, the operation of the electronic paper system 1 of the present embodiment will be described. Note that in this description, the operation of performing handwritten input on the display unit 35 using the input device 4 that is a feature of the present invention will be mainly described.

  When the input device 4 held by the user is moved on the display unit 35, the display unit 35 is irradiated with light including infrared rays from the illumination unit 50 provided at the tip of the input device 4. At this time, the light in the infrared wavelength region irradiated from the illumination unit 50 is imaged by the imaging unit 51 of the input device 4 as reflected light from the position information pattern 34 a of the position information pattern layer 34 stacked on the display unit 35. .

  At this time, the reflected light includes a component reflected by the electrophoretic particles 25 as noise. In the present embodiment, as described above, the reflected light from the position information pattern 34a has high luminance due to retroreflection, so that the light amount difference is increased. By increasing the size, noise can be removed from the image captured by the image capturing unit 51, and the component of the position information pattern 34a can be captured well.

  Further, in the present embodiment, although anti-glare processing is performed, the display device is configured by reducing the haze value in the formation area A1 of the corner cube prism P and increasing the haze value in the non-formation area A2 of the corner cube prism P. Thus, retroreflection on the position information pattern layer 34 can be favorably generated while suppressing light reflection on the entire display screen 3.

  The imaging unit 51 transmits the captured image to the image processing unit 52. The image processing unit 52 digitally processes an image indicated by the electrical signal sent from the imaging unit 51 to extract a drawing pattern indicated by the position information pattern 34 a, and transmits the extracted result to the position information detection unit 53. The position information detection unit 53 extracts a code string from the feature of the drawing pattern arrangement, decodes the code string, and acquires position information. That is, the input device 4 can detect information (for example, coordinates) related to the position where the tip of the input device 4 is in contact with the display unit 35. The input device 4 can output the detected position coordinate information from the input device wireless communication unit 42 to the display device control unit 32 via the display device wireless communication unit 33.

  The position detection unit 41 transmits the position information acquired by the position information detection unit 53 to the input device wireless communication unit 42. The input device wireless communication unit 42 transmits the received position information to the display device wireless communication unit 33 of the display device 3 by a wireless method. Thus, in this embodiment, since the position coordinate information by the input device 4 can be output to the display device 3 side by a wireless method, it is not necessary to connect the input device 4 and the display device 3 with wiring. Therefore, it is possible to prevent the occurrence of problems such as entanglement of wiring when handwritten input is performed on the display device 3, and high operability can be obtained.

  The display device 3 outputs the position information acquired from the input device 4 to the display device control unit 32 via the display device wireless communication unit 33. The display device control unit 32 controls the display state of the display unit 35 via the display body drive control unit 31 based on the position coordinate information detected by the position detection unit 41.

  Specifically, the display body drive control unit 31 controls the voltage applied between the pixel electrode 23 and the transparent electrode 24 corresponding to the acquired position coordinate information in the display unit 35, and the electrophoretic particles in the microcapsule 65. By moving 25, the handwritten handwriting input by the user using the input device 4 can be displayed on the display unit 35.

  As described above, according to the electronic paper system 1 according to the present embodiment, even when the input device 4 is in contact with the surface of the position information pattern layer 34, the corner cube prism formed inside the substrate 34A. Direct contact between P and the input device 4 is prevented. Therefore, the position information pattern 34a is worn out, and the reliability is high in that the occurrence of the problem that the position information cannot be acquired is prevented.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of invention, it can change suitably. For example, in the above-described embodiment, the case where each of the position information patterns 34a is configured by one corner cube prism P has been described. However, as illustrated in FIG. The information pattern 34a may be configured. According to this configuration, the amount of detection light reflected to the input device 4 side by the position information pattern 34a can be increased, and position information based on the position information pattern 34a can be detected with high accuracy.

  In the above embodiment, the case where an electrophoretic display device is provided as the display unit 35 of the display device 3 has been described as an example, but the present invention is not limited to this. For example, an organic electroluminescence device or a liquid crystal display device may be used as the display unit 35.

DESCRIPTION OF SYMBOLS 1 ... Electronic paper system, 3 ... Display apparatus, 4 ... Input device, K ... Air layer, P ... Corner cube prism, 34a ... Position information pattern, 34 ... Position information pattern layer, 34B ... Concave-convex part (antireflection process), 35 ... display unit, 35a ... display surface, 50 ... illumination unit, 51 ... imaging unit, 70 ... adhesive layer, A1 ... formation region, A2 ... non-formation region

Claims (6)

A display device capable of displaying handwritten handwriting input using an input device,
A display unit for displaying the handwriting;
A position information pattern that is provided on the display surface side of the display unit and defines position information of a tip portion of the input device;
The display device, wherein the position information pattern is formed in a transparent layer provided on the display surface, and is configured by a prism capable of retroreflecting illumination light illuminated from the input device.   The display device according to claim 1, wherein the prism is formed by processing a transparent resin substrate constituting the transparent layer, and an air layer is interposed between the prism and the display surface.   The display device according to claim 1, wherein the surface of the transparent layer is subjected to antireflection processing in a region excluding the prism in a plan view.   The display device according to claim 1, wherein the display device includes the plurality of position information patterns, and each of the position information patterns includes a plurality of the prisms.   The display device according to claim 1, wherein the transparent layer is provided on the display surface via an adhesive layer. A display device according to any one of claims 1 to 5,
An input system comprising: an input device that inputs information related to handwriting by handwriting.

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