JP2012243201A - Display device with input function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device with input function capable of enhancing accuracy in detecting position information of a peripheral portion of a display area in pen input.SOLUTION: A display device with input function of the present invention comprises: position information reading means for reading position information patterns that represent coordinate positions on a planar surface; and displaying means in which the position information patterns are recorded in a display area constituted of a plurality of pixels and which performs display on the basis of codes read from the position information patterns. The position information patterns are disposed so as to be extended at least from the display area to the peripheral area thereof.

Description

  The present invention relates to a display device with an input function.

  In recent years, portable electronic devices capable of touch panel input and pen input have become widespread. These input methods eliminate the keyboard, maximize the display area, and support display switching while allowing anyone to input with simple operations. Therefore, it has become an indispensable input technology for recent portable electronic devices that are small and require many functions. In particular, the pen input method is an indispensable means for drawing a sign or a picture in the display area because it can be input and operated more accurately and faster than a finger with a pen and paper feel that is familiar to everyday use. . The needs range from personal markets such as games and electronic books to business markets such as tablets and CAD.

  In the future, it is expected to be used much in the field of school education like electronic textbooks. There are many types of conventional pen input systems, such as a resistive film type, an optical type, an ultrasonic type, and an electromagnetic type, but their performance has advantages and disadvantages. The common problem is that the detection means and the mounting structure limit the arrangement of the display body and increase the thickness of the main body (enlargement). In the future, portable electronic devices are becoming thinner and more flexible, and it is difficult to respond to them with conventional technology.

  As a general prior art of touch panel and pen input, there are a resistance film type using a transparent electrode and a capacitance detection type. However, the display contrast is reduced by about 10% depending on the transmittance and reflectance of the transparent electrode. In particular, in portable devices, a reflective display with low power consumption is often used for the purpose of extending the battery life, and a decrease in transmittance of several percent greatly reduces the display quality.

  As a conventional technique for preventing a decrease in display performance, there is an optical type that detects a pen input position using a plurality of LED light sources and a photosensor. However, since this optical type needs to secure an optical path by mounting LEDs and photosensors around the display body, the display area becomes narrow and the thickness of the apparatus increases. In addition, there is an ultrasonic type that detects the position by measuring the return time of the ultrasonic wave. However, like the optical type, there is a problem in that the display area is narrowed and the thickness of the apparatus is increased.

  Patent Document 1 discloses a basic technique of an electromagnetic position detection device. In this technique, a magnetic field generated from an input pen is detected by a plurality of loop antennas, and an antenna substrate is provided below the display body. Patent Document 2 describes a dot pattern forming method of optical means using an image pickup element built in an input pen and a printed position information pattern, and a decoding method thereof. Patent Document 3 describes an example of a note pad sheet having a writing surface and an activation icon on which an encoded position information pattern is formed.

JP-A-63-70326 Japanese Patent No. 3874498 Special table 2003-508843 gazette

  In the above-described conventional technology, the position information pattern indicating the coordinate position on the display area (writing area) is provided in the same area as the display area. For this reason, when handwritten input is performed on the display area using the input pen, a part of the position information pattern is missing from the imaging range of the input pen at the peripheral part of the display area, and the position information is acquired at the peripheral part of the display area. There is a problem that accuracy decreases. In addition to the planar positional deviation, the tilt angle of the input pen relative to the display surface greatly affects reading. If the input pen is greatly tilted with respect to the display surface, the position information pattern of the predetermined area cannot be imaged, and an accurate coordinate position cannot be detected.

  The present invention has been made in view of the above-described problems of the prior art, and provides a display device with an input function that can improve the position information detection accuracy in the periphery of the display area in pen input (handwriting input). This is one of the purposes.

  In the display device with an input function of the present invention, the position information pattern is recorded in a display area including a plurality of pixels, and a position information reading unit including an image sensor that optically reads a position information pattern representing a coordinate position on a plane. Display means for performing display based on a code read from the position information pattern, wherein the position information pattern is extended from at least the display area to its peripheral area. .

  According to this, since the position information pattern is provided at least in the display area and its peripheral area, when the position information pattern is captured by the position information reading means and the coordinate position is read, the peripheral edge of the display area is displayed. Since the position information pattern in the portion is prevented from being interrupted, it is possible to obtain accurate position information by the position information reading means for the peripheral portion of the display area. Further, unlike the conventional case, it is not necessary to secure an optical path by mounting LEDs or photosensors around the display means, so that the display area can be prevented from being narrowed, and an antenna substrate is provided below the display body. Since it is not necessary to provide the device, the apparatus can be thinned.

The position information pattern is provided in a command area set on a side surface or a back surface other than the front surface having the display area, and both, and the command area includes at least one coordinate point of the position information pattern. It is good also as the structure which has come out.
According to this, since the command area includes at least one coordinate point of the position information pattern, it is possible to cope with the selected position deviation of the command area.

In addition, the position information reading unit picks up the position information pattern by using the image pickup element, the light emitting element that emits light toward the position information pattern, and the detection information read by the image pickup element by the image pickup element. It is good also as a structure which reads a pattern optically.
According to this, based on the code obtained by the position information reading means optically reading the position information pattern with the image sensor, it is possible to input to the display area handwritten to the display means. By reading the position information pattern optically, the position information pattern can be read even when the position information reading means is not in contact with the display means.

Further, the position information pattern is a two-dimensional pattern called an M plane, and is a dot pattern provided at an arbitrary position of a matrix intersection of the first virtual line pattern and the second virtual line pattern orthogonal thereto. It may be configured.
According to this, the position of the display area can be accurately grasped using the characteristic (unique value) of the M plane.

The position information pattern may transmit visible light and absorb infrared light.
According to this, since only the position information pattern can be detected except for the background light (image of the display area) of the display means, accurate position information can be obtained. Further, it is possible to read the position information pattern while avoiding a decrease in the SN ratio due to ambient ambient light (such as visible light).

The position information pattern may reflect light in a wavelength region different from that of the image displayed in the display region.
According to this, since only the position information pattern can be detected without the influence of the background light (image of the display area) of the display means, accurate position information of the position information reading means for the display area can be obtained. .

The position information pattern may be identified by polarized reflection.
According to this, for example, by identifying right circularly polarized light, left circularly polarized light, p-polarized light, and s-polarized light that are reflected with different reflectivities, the position of the display means is excluded except for the background light (image of the display area). Since only the information pattern can be detected, accurate position information can be obtained.

Further, the position information pattern may be constituted by an uneven dot pattern.
According to this, the return amount of the reflected light of the light irradiated from the position information reading means is different between the uneven dot pattern and the other planar region. Most of the light diffuses in the dot pattern, but most of the light passes through the planar area. For this reason, the reflected light increases at the dot pattern portion, and bright and good imaging can be performed by the position information reading means.

The display means may be an electrophoretic display element.
According to this, since the display content can be maintained even when power supply from the outside is stopped, a display device with an input function capable of reducing power consumption can be obtained.

The display means may be a nonvolatile display element.
According to this, since the display content can be maintained even when power supply from the outside is stopped, a display device with an input function capable of reducing power consumption can be obtained.

The top view which shows the whole structure of the display apparatus with an input function of this invention. The perspective view which shows the whole structure of a display apparatus with an input function. The figure which shows schematic structure of an electronic pen. FIG. 3 is a diagram illustrating a schematic configuration of a position information pattern in the first embodiment. 1 is a perspective view illustrating a schematic configuration of an input function device according to Embodiment 1. FIG. FIG. 3 is a diagram illustrating a curved state of the display device with an input function according to the first embodiment. FIG. 6 is a diagram illustrating a schematic configuration of a position information pattern in Embodiment 2. FIG. 10 is a diagram illustrating a schematic configuration of a position information pattern in Embodiment 3.

  Embodiments of the present invention will be described below with reference to the drawings. In each drawing used for the following description, the scale of each member is appropriately changed to make each member a recognizable size.

[First Embodiment]
FIG. 1 is a plan view showing the overall configuration of a display device with an input function according to the present invention. FIG. 2 is a perspective view showing the overall configuration of the display device with an input function.
As shown in FIGS. 1 and 2, the display device with an input function 100 includes an electronic pen (position information reading means) 110 and a display main body (display means) 120, and the display device 120 has an electronic function with respect to the display surface. The display device is capable of handwritten input using the pen 110. Here, the position information pattern 16 is used as means for detecting the position information (coordinate value in time variation) of the electronic pen 110 on the display body 120, and the time series data of the contact point of the electronic pen 110 with respect to the display surface of the display body 120 is used. Acquire and display handwritten information.

  The display main body 120 includes a display body 10 and a housing 11 that holds the display body 10. The display 10 can be appropriately selected from an electrophoretic display (hereinafter referred to as “EPD”) having an electrophoretic element as a memory display element, a liquid crystal device, an OLED, and the like. The various display bodies described above require an outer peripheral space called a frame because of the seal structure and mounting of the driving IC. Although not shown, a wireless communication unit, a control unit, a drive control unit, and the like of the display body 10 are mounted in the housing 11.

  The display body 10 is fitted in the housing 11 with its display surface exposed, and handwriting input can be performed with the electronic pen 110 on the display area 5 in which a plurality of pixels are arranged in a matrix on the display surface. It is configured as follows. The display body 10 is provided with a position information pattern 16 that defines two-dimensional coordinates on the display area 5. The position information pattern 16 includes a first dot 16A represented by a black circle and a second dot 16B represented by a linear portion, and a plurality of virtual raster lines (first virtual line pattern) arranged at a predetermined pitch in the X direction. ) By displaying coordinate values by the dots 16A and 16B arbitrarily provided at the intersections of 17A and a plurality of virtual raster lines (second virtual line patterns) 17B arranged at a predetermined pitch in the Y direction, 5 is used as a pattern for obtaining position information. Thereby, when an arbitrary place on each wall surface of the housing 11 is designated by the electronic pen 110, the coordinates of the designated position are obtained based on the position information pattern 16.

  In the present embodiment, not only the portion corresponding to the display area 5 of the display body 10 but also the position information pattern 16 is provided extending from the display area 5 to the surface 11a of the housing 11 corresponding to the peripheral area. In other words, the position information pattern 16 on the display area 5 is extended and provided also on the surface 11 a of the housing 11 on the same plane as the display surface of the display body 10.

  The first dot 16A indicates the code “0”, and the second dot 16B indicates the code “1”. The position information pattern 16 including the first dots 16A and the second dots 16B constitutes, for example, an M plane (overall plane) of 7 rows × 9 columns = 63 dots, and the pitch of each dot 16A, 16B is an XY coordinate. It becomes resolution. The minute unit area A on the M plane corresponds to the imaging area of the electronic pen 110, and the electronic pen 110 optically applies a partial pattern 16a composed of a plurality of first dots 16A and second dots 16B scattered in the minute unit area A. The position information of an arbitrary coordinate position can be obtained by reading the data. Here, the partial pattern 16a is configured in the minute unit area A by a total of 6 dots of 3 vertical dots and 2 horizontal dots. The number and arrangement of each of the dots 16A and 16B in the minute unit region A are arbitrary, and this numerical value obtained by these numbers and positional relationship is calculated by only one on the M plane. Can be used to derive the coordinate position.

  The position information pattern 16 may be formed by directly printing on the display surface (display region 5) of the display body 10 or each wall surface of the housing 11, or a transparent resin film made of a material such as PET. A transparent conductive film in which the position information pattern 16 is formed on one surface side of the film 12 may be pasted.

  At this time, it is important not to affect the display quality and to prevent the display image or the exterior surface from becoming background noise and causing the reading error of the code based on the position information pattern 16 in the electronic pen 110. . As a countermeasure, the position information pattern 16 is formed by using an LED or a laser diode as a light source (light emitting element 43) of the electronic pen 110, which will be described later, and further using ink that transmits visible light and absorbs light in the infrared band. By doing so, it is possible to increase the contrast of the captured image without reducing the transmittance in the visible light region. As a result, it is possible to detect only the position information pattern without the influence of the image (background light) of the display body 10, so that accurate position information can be obtained.

Next, the position information pattern 16 will be described in detail.
As shown in FIGS. 1 and 2, the position information pattern 16 is a two-dimensional series pattern called an M plane, and is arranged at predetermined intersection positions of virtual raster lines 17A and 17B extending in directions intersecting each other. It is composed of a plurality of dots 16A and 16B. That is, the two-dimensional position is uniquely defined from the two-dimensional code obtained by the number and arrangement state of the dots 16A and 16B in the minute unit area A in the position information pattern 16. Here, the designated position (input position) by the electronic pen 110 is determined by the code acquired from the partial pattern 16a in the minute unit area A on the M plane, that is, the electrical signal determined by the number of dots 16A and 16B, the arrangement position, and the like. Any position on the position information pattern 16 is uniquely determined.

  Specifically, the position information pattern 16 constitutes an M plane composed of 15 × 17 bits corresponding to the display area 5, and the position of the intersection of the virtual raster lines 17 </ b> A and 17 </ b> B is the coordinates of the display body 10 (each pixel ). On the M plane, a partial pattern 16 a of 4 × 2 bits is given for each minute unit area A corresponding to the imaging area (window) in the electronic pen 110. Since the partial pattern 16a differs in dot pattern (the number of dots 16A and 16B, the arrangement position, etc.) according to the position of the position information pattern 16, the partial pattern 16a of a predetermined minute unit region A is read by the electronic pen 110. Then, only one value (coordinate position) is obtained in the entire M plane.

Here, the plane size (15 × 17 bits) of the M plane will be described.
When the finite field GF (q) is an M plane having a maximum period length: n, a plane size: n ₁ × n ₂ , and a window size: k ₁ × k ₂ ,

である。

It is.

  Therefore, in the position information pattern 16 of the present embodiment, GF (2) (symbols [0], [1]).

となり、平面サイズｎは１５×１７となる。
したがって、１５×１７ビットのＭ平面となる。

Thus, the plane size n is 15 × 17.
Therefore, the M plane is 15 × 17 bits.

  Thus, in this embodiment, by providing the position information pattern 16, unique coordinate information corresponding to only the coordinates is assigned to each coordinate in the display area 5. The coordinate information is encoded and assigned to a plurality of dots 16A and 16B scattered in the minute unit area A (FIG. 1) in the display area 5, and a partial pattern 16a composed of the plurality of dots 16A and 16B. Is read optically with the electronic pen 110 (FIG. 3), so that arbitrary coordinate position information can be obtained. Here, there may be a case where only the first dot 16A exists in the minute unit area A or a case where only the second dot 16B exists.

  Specifically, a predetermined minute unit area A of the position information pattern 16 is imaged using an electronic pen 110 to be described later, and the numbers and arrangement states of the dots 16A and 16B arranged at arbitrary intersection positions in the area. The digital code is acquired by taking a predetermined number of bits from Since this is a partial code representing a position on the M plane, it is converted into corresponding coordinates by table conversion. In FIG. 1, the positions of three minute unit areas A are surrounded by dotted lines. Therefore, the coordinates of the designated position are uniquely determined by calculating this value backward or comparing the reference table. Then, the data read by the electronic pen 110 is transmitted from the electronic pen 110 to the electronic circuit component (wireless circuit, control unit) on the display body 10 side by wireless or optical communication, and the corresponding pixel in the display body 10 is turned on. Handwriting input is possible.

Next, a schematic configuration of the electronic pen will be described.
FIG. 3 is a diagram showing a schematic configuration of the electronic pen according to the present invention.
As shown in FIG. 3, the electronic pen 110 includes a collimator lens 42, a light emitting element 43, an imaging element 44, an electronic circuit component 45, a battery 46, and the like inside a thin rod-shaped pen type case 41. . As the light emitting element 43, a light emitting diode (LED) or a laser diode (semiconductor laser) is suitable. As the imaging device 44, a CCD camera or a CMOS sensor capable of imaging and recording the partial pattern 16a of the minute unit area A of the position information pattern 16 is used. The light sensitivity of these semiconductor sensors has a peak in the vicinity of 600 nm, and the light emitting element 43 in the infrared region may be used in order to suppress the influence of external light or light of the display image. In this case, background light (display image) other than the position information pattern 16 can be removed by arranging an infrared light transmission filter that transmits infrared light and blocks visible light together with the collimator lens 42. As a result, accurate position information with the electronic pen 110 on the display area 5 in the display body 10 can be obtained.
A pyroelectric element that detects light including infrared rays by the pyroelectric effect may be used.

The electronic circuit component 45 includes image processing means such as a CPU that performs light emission, imaging, and detection calculation processing, a wireless circuit that transmits detection data to the main body, and the like.
The power of the electronic pen 110 is supplied from a battery 46 attached in the pen type case 41.
The light emitting element 43 does not always need to be lit, and the display body 10 is illuminated in a pulsed manner toward the display area 5 from the scanning speed of the electronic pen 110 and the imaging timing of the imaging element 44, etc. The light emission time and power consumption are controlled according to (background luminance).
Here, if the information obtained by the imaging device 44 at the previous illumination is fed back at the next illumination, the SN ratio is further improved.

As described above, in the present embodiment, since the position information pattern 16 is extended from the display area 5 to the surface 11a of the housing 11 in the peripheral area, a predetermined portion on the periphery of the display area 5 is provided. When specified with the electronic pen 110, a predetermined area of the position information pattern 16 existing over the periphery of the display area 5 and the outer area (partial pattern in the minute unit area A corresponding to the imaging area of the electronic pen 110). ) To calculate the coordinates.
That is, when the peripheral position of the display area 5 is designated (imaged) by the electronic pen 110, the position information pattern 16 at that part is not partially lost, and accurate coordinate position information at the peripheral edge of the display area 5 is acquired. be able to. As a result, a certain position detection accuracy can be obtained by the electronic pen 110 as a whole including the peripheral portion of the display area 5.

  Therefore, the coordinates are calculated while reading the partial pattern 16a in the minute unit area A on the display area 5 with the electronic pen 110, the information is sent to the display body 120 by means of wireless or the like, and the position inputted from the electronic pen 110 By displaying the locus of the pen tip in the display area 5 based on the information, handwriting input becomes possible.

  Further, even when the electronic pen 110 is tilted and the pen tip is directed to the outer housing 11 side instead of the display body 10 side, the partial pattern 16a in the minute unit area A including the periphery of the display area 5 and the outer periphery thereof is read. Accurate coordinate position information can be obtained.

  Further, according to the present embodiment, since the position information pattern 16 is extended to the periphery of the display area 5, the virtual input area is formed by scanning the electronic pen 110 outside the frame of the display area 5. It is possible. This is a very effective function when the image is zoomed up.

  In this way, by increasing the position detection accuracy in the entire display area 5 and providing the entire housing 11 with an input function, it contributes to expanding the usage and application market of the portable device as the display device with an input function 100. . A highly functional device can be obtained while taking advantage of the convenience of handwriting without impairing the thinning of the device body. In addition, it is possible to facilitate analog information input / output with respect to the digital content information input / output system, and to expand the possibility of information processing.

  In the present embodiment, the number of dots 16A and 16B constituting the position information pattern 16 is shown with a small number of dots for the sake of explanation. However, in reality, an M plane composed of a dot pattern of several hundreds × several hundred dots is required. The partial pattern 16a in the minute unit area A also has at least several tens of several tens of dots.

  Specifically, in the actual display area 5, the number of pixels of 256 × 256 or more and the minute unit area A of 6 × 6 dots or more are necessary. The required number of pixels corresponds to the number of dots in the minute unit area A. Further, if more bit number information can be given to one pixel in the position information pattern 16, the size of the minute unit area A, that is, the size of the imaging area by the electronic pen 110 can be further reduced. it can. By doing so, the electronic pen 110 can be miniaturized.

  Further, the dot patterns indicating the codes [0] and “1” are merely examples, and various shapes and combinations can be selected. For example, the codes [0] and “1” are identified by the difference in size and shape of the dots 16A and 16B, the direction of the dots 16A and 16B, or the direction and size by using the triangular dots. [0] and “1” may be identified. It is also possible to use a method such as encoding at a relative position between the virtual raster line and the dot. The shape and type of the dot pattern and the decoding method are not particularly mentioned in this embodiment.

  FIG. 4 is a diagram showing a schematic configuration of the position information pattern in the first embodiment, and shows the position information pattern corresponding to the command key. FIG. 5 is a perspective view illustrating a schematic configuration of the input function device according to the first embodiment. FIG. 6 is a diagram illustrating a curved state of the display device with an input function according to the first embodiment.

  As shown in FIGS. 4 and 5, in this embodiment, two-dimensional coordinates on each wall surface are also applied to each wall surface (Y side surface 11 b, X side surface 11 c, back surface 11 d) other than the front surface 11 a of the housing 11. A position information pattern 16 to be defined is provided. Here, all the position information patterns 16 on each wall surface may be a series of patterns, or individual position information patterns 16 may be provided for each wall surface. For this reason, it may be formed in the same process as the position information pattern 16 on the display area 5 or may be formed in a separate process.

  On each wall surface of the housing 11 where the position information pattern 16 is provided, a plurality of command keys C (C1 to C4) are set for each execution function. Specifically, a command key C1 is set on the front surface 11a of the housing 11, a command key C2 is set on the Y side surface 11b, a command key C3 is set on the X side surface 11c, and a command key C4 is set on the back surface 11d. As the execution function of each command key C1 to C4, for example, the command key C1 is a power switch, the command key C2 is an up / down cursor key, the command key C3 is a screen brightness adjustment key, the command key C4 is a search function key, etc. Can be assigned to. By arranging the command key C that is not frequently used on the side surfaces 11b and 11c and the back surface of the housing 11, the space efficiency of the front surface 11a is improved.

When an arbitrary place on each of the command keys C1 to C4 is designated with the electronic pen 110, the coordinates of the designated position are obtained based on the position information pattern 16 provided on each of the command keys C1 to C4. Here, the command keys C <b> 1 to C <b> 4 set in an arbitrary area where the position information pattern 16 on each wall surface is present only need to include at least one coordinate point of the position information pattern 16. If the command area includes at least one coordinate point of the position information pattern, it is possible to cope with the selected position deviation of the command area.
Further, since the command keys C1 to C4 do not require mechanical contacts, they can be easily formed into a free shape by printing, pasting a seal or the like.

  The position information pattern 16 and the appearance of the command keys C1 to C4 can be identified by selecting inks having different reflection wavelengths or using an optical filter. Further, instead of the command keys C1 to C4, it is possible to arrange a further display body as an icon. By adopting a configuration in which the command key C and icon can be input with the electronic pen 110, a smooth input operation can be performed without placing or changing the electronic pen during handwritten input. This has a high effect of not impairing the user's thinking and working speed.

  In addition, when a pen input is made on the back surface 11d, a function expansion such as input to the back surface of an object appearing in the video displayed in the display area 5 can be considered. For example, a three-dimensional man-machine interface is realized in which a person behind is shooting while a soccer game is being executed on the display main body 120. In order to realize such an input means using a conventional touch panel or pen input means, there are problems in securing the arrangement space of the members and increasing the cost. Since there are almost no additional parts and the position information pattern 16 can be added at the final stage of the manufacturing process, the manufacturing management is facilitated at a low thickness and at a low cost.

  Moreover, as shown in FIG. 6, the display main body 120 may be made into the structure which has flexibility, and it is suitable when using it with a bending attitude | position.

Further, by performing optical processing such as polarization and scattering on the position information pattern 16, it is possible to identify the image of the display area 5 and the position information pattern 16. For optical processing such as polarization and scattering, a multilayer film, a photonic crystal, a MOS eye structure, or the like can be selected.
Examples of position information patterns subjected to polarization processing and scattering processing will be described below.

FIG. 7 is a diagram illustrating a schematic configuration of a position information pattern in the second embodiment.
As shown in FIG. 7, the position information pattern 18 in the present embodiment is different from the previous embodiment in that it has polarization characteristics.
The position information pattern 18 in the present embodiment is an arbitrary intersection among intersection points of a plurality of virtual raster lines 17A arranged at a predetermined pitch in the X direction and a plurality of virtual raster lines 17B arranged at a predetermined pitch in the Y direction. The first dots 18A and the second dots 18B are arranged at the locations. The first dot 18A is a polarization pattern that reflects right circularly polarized light, and represents the code [1]. The second dot 18B is a polarization pattern that reflects left circularly polarized light, and represents the code [0]. The position information pattern 18 constituted by the first dots 18A and the second dots 18B reflects light in a wavelength region different from the image displayed in the display region 5, and is formed by printing using a cholesteric material. It is possible. Or you may form by sticking the substance and material which have birefringence like a mica.

  The light 50 from the light emitting element 43 provided in the electronic pen 110 becomes right polarized light by the polarizing filter 51 provided on the front surface side of the light emitting element 43, irradiates the position information pattern 18, and is reflected by the first dot 18A. Is done. The reflected light 52 returns to the electronic pen 110 as right polarized light and is read by the image sensor 44.

  On the other hand, the light 50 irradiated to the region where the position information pattern 18 does not exist is specularly reflected and changed to left polarized light. The reflected light 53 is cut by the polarizing filter 51 and does not reach the image sensor 44. In this way, the display surface and the position information pattern 18 can be identified.

In addition, if the angle of the electronic pen 110 with respect to the display surface is specified, it is possible to discriminate using P-polarized light and S-polarized light without using circularly polarized light. In this case, the position information pattern can be formed with a photonic crystal or a dielectric multilayer film.
Further, a reflective polarization pattern using a wire grid or the like can be formed by the same patterning.

FIG. 8 is a diagram illustrating a schematic configuration of a position information pattern in the third embodiment.
As shown in FIG. 8, the position information pattern 19 in the present embodiment is different from the previous embodiment in that the position information pattern 19 is composed of dots having uneven surfaces.
The dot 19 </ b> A is composed of an uneven surface of several tens to several hundreds of microns formed on the display surface of the display body 10 and the surface of the housing 11 using chemical polishing or the like. The surface other than the dots 19A is a flat surface (plane 62). Therefore, when the light 60 from the light emitting element 43 of the electronic pen 110 is irradiated to the dots 19 </ b> A having the uneven surface, most of the dots 19 </ b> A of the position information pattern 19 are diffused and partially transmitted. Here, it is preferable to make the uneven surface so that the reflected light at the dot 19A is close to the Gaussian distribution.

  On the other hand, most of the light 60 irradiated on the plane 62 from the electronic pen 110 is transmitted, and a part of the light 60 is reflected in a direction symmetrical to the incident angle. However, if the incident angle of the light 60 emitted from the electronic pen 110 is large with respect to the normal direction of the surface on which the position information pattern 19 is formed, the surface 62 may be totally reflected. For this reason, the total reflected light reflected back in the irradiation direction of the incident light 60, that is, the amount of light returning to the electronic pen 110 is greatly different between the dot 19A and the plane 62, and the reflected light from the dot 19A is more flat. More than the reflected light from 62. Therefore, the dot 19 </ b> A of the position information pattern 19 is detected (captured) as a bright image by the image sensor 44 in the electronic pen 110 described above.

  In the first and second embodiments described above, the position information patterns 18 and 19 can be easily formed using patterning, etching, or the like without providing a new member. For this reason, the position information patterns 18 and 19 formed in the display area and the peripheral area can be formed seamlessly. The patterning of the position information patterns 18 and 19 can be formed not only on the display area 5 of the display body 10 and the front surface 11a of the housing 11 but also on the side surfaces 11b and 11c and the back surface 11d of the housing 11, The formation area (input range) of the position information pattern 16 can be extended to the entire surface of the housing 11.

  As described above, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the examples. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

  For example, in the previous embodiment, an electrophoretic display device using an electrophoretic element has been adopted as the display body 10, but the present invention is not limited to this, and a non-volatile display device can be used. Accordingly, the display content can be maintained even when power supply from the outside is stopped, so that a display device with an input function capable of reducing power consumption can be obtained.

5 ... display area, 10 ... display body, 11a ... front surface, 11b ... side surface, 11d ... back surface, 16, 18, 19 ... position information pattern, 16A, 19A ... dot, 17A ... virtual raster line (first virtual line pattern) , 17B ... virtual raster line (second virtual line pattern), 43 ... light emitting element, 44 ... imaging element, 50, 60 ... light, 52, 53 ... reflected light, 62 ... plane, 100 ... display device with input function, 110 ... Electronic pen (position information reading means), 120 ... Display body (display means)

Claims (10)

Position information reading means including an image pickup device that optically reads a position information pattern representing a coordinate position on a plane;
The position information pattern is recorded in a display area composed of a plurality of pixels, and includes display means for performing display based on a code read from the position information pattern,
The display device with an input function, wherein the position information pattern is extended from at least the display area to a peripheral area thereof. The position information pattern is provided in a command area set on a side surface or a back surface other than the front surface having the display area, and both, and the command area includes at least one coordinate point of the position information pattern. The display device with an input function according to claim 1. The position information reading means is
An image sensor that images the position information pattern;
A light emitting element that emits light toward the position information pattern;
3. The display device with an input function according to claim 1, wherein the position information pattern is optically read by the image pickup device based on the detection data read by the image pickup device. The position information pattern is a two-dimensional pattern called an M plane, and is constituted by a dot pattern provided at an arbitrary position of a matrix intersection between a first virtual line pattern and a second virtual line pattern orthogonal to the first virtual line pattern. The display device with an input function according to claim 1, wherein the display device has an input function. 5. The display device with an input function according to claim 1, wherein the position information pattern transmits visible light and absorbs infrared light. The display device according to claim 1, wherein the position information pattern reflects light in a wavelength region different from that of an image displayed in the display region. The display device with an input function according to claim 1, wherein the position information pattern is identified by polarization reflection. The display device with an input function according to any one of claims 1 to 6, wherein the position information pattern is configured by an uneven dot pattern. The display device with an input function according to any one of claims 1 to 8, wherein the display means is an electrophoretic display device. The display device with an input function according to claim 1, wherein the display unit is a non-volatile display device.

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