JP2009070160A - Coordinate input device and handwriting input display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coordinate input device and a handwriting input display device for validating the input of coordinates with an operation member such as a pen or an eraser while invalidating the input of coordinates with the hand of a user. <P>SOLUTION: This coordinate input device is provided with a coordinate input region 30 where a plurality of light receiving parts to which the rays of light emitted by a back light 22 of an LCD panel 21, and reflected from a pen or the hand or the like are made incident are arranged like a matrix. When it is considered that the shape of the region touched with the pen is more fixed than the region touched with the hand of a user, the shape of the region touched with the pen is determined as a valid shape, and whether or not the shape formed of the plurality of light receiving parts which have received the rays of light according as the coordinate input region 30 is touched with an object is the valid shape is decided, and when the shape is valid, the input of coordinates is made valid, and when the shape is invalid, the input of coordinates is made invalid. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical coordinate input device that accepts input of coordinates, and a handwriting input display device including the coordinate input device.

  A coordinate input device such as a tablet or a touch panel accepts input of coordinates by a user. The user of the coordinate input device makes a bar-shaped operation member (hereinafter referred to as a pen) such as a touch pen or a stylus pen approach or come into contact with the coordinate input area of the coordinate input device. Find the coordinates of the position. The obtained coordinates are, for example, a liquid crystal display separate from the coordinate input device, or an object such as a point image or a straight line image on a display screen such as a liquid crystal display panel (LCD panel) laminated integrally with the coordinate input device. Used to display In the following, a coordinate input device that obtains the coordinates of the position where the pen touches (touches) will be exemplified, but the coordinate input device that obtains the coordinates of the position where the pen approaches has a substantially similar configuration. Here, the coordinates of the position touched by the pen are generally the coordinates of the center position of the area touched by the pen.

  By the way, the coordinate input device is similar to the case where the pen touches the coordinate input area, even when an object other than the pen, particularly when the user's hand accidentally touches the coordinate input area, Coordinates may be obtained (hereinafter referred to as erroneous detection). For this reason, useless images may be displayed on the display screen based on erroneously detected coordinates. In addition, although not only a user's hand but a false detection also arises when objects other than a pen accidentally touch a coordinate input area, the false detection regarding a user's hand is demonstrated below.

In view of such circumstances, conventionally, when two touch areas are detected when an object touches the touch panel surface, the comparison result of the areas of both touch areas, or the time change rate of the areas of both touch areas Based on the above, a touch panel device that determines validity / invalidity of a touch area has been proposed (see Patent Document 1).
The touch panel device disclosed in Patent Document 1 has a touch area with a large area or a touch area with a small time change rate of the area by a user's hand, and the touch area with a small area or the time change rate of the area has a small time change rate. A large touch area is assumed to be a pen.

Conventionally, a coordinate input device including an area sensor has been used. The area sensor uses a plurality of light receiving portions arranged in a matrix, and when the pen touches the coordinate input area, light reflected from the pen enters the light receiving portion. The coordinates of the x-axis and the y-axis are associated with each light receiving unit, and the coordinates of the position touched by the pen are obtained based on the coordinates associated with the received light receiving unit.
JP 2006-39686 A

However, in the configuration in which two touch areas are compared as in the touch panel device of Patent Document 1, erroneous detection cannot be prevented when only the user's hand touches by mistake.
Moreover, in the structure which prevents a false detection based on the area of the area | region which the object touched like the touchscreen apparatus of patent document 1, for example, when a user's fingertip touches a coordinate input area, the user's fingertip touched Since the area of the area is small, it cannot be distinguished from the area touched by the pen. In addition, when a flat operation member called an eraser is used instead of a pen, for example, the area touched by one surface of the eraser is large, so that it cannot be distinguished from the area touched by the hand.

Further, conventionally, a coordinate input device including an area sensor has not been prevented from being erroneously detected.
By the way, the area touched by one surface of the pen tip or the eraser has a constant shape as compared with the area touched by the user's hand or fingertip.

  The present invention has been made paying attention to the fact that the shape of the area touched by the operation member is constant, and its main purpose is whether or not the shape formed by the received light receiving portion is an effective shape. The coordinate input by the operation member can be validated while invalidating the coordinate input by the user's hand. A coordinate input device and a handwritten input display device are provided.

  Another object of the present invention is to simplify whether or not the shape formed by the received light receiving portion is an effective shape by comparing the shape formed by the received light receiving portion with a predetermined shape. It is an object of the present invention to provide a coordinate input device that can make a determination.

  Another object of the present invention is to determine whether or not a received light receiving portion is present in a region corresponding to an outer edge portion of a predetermined shape, so that coordinates of an object having a size larger than that of an operation member can be obtained. An object of the present invention is to provide a coordinate input device capable of invalidating input.

  Another object of the present invention is to determine whether or not there are a predetermined number or more of light receiving portions in the region corresponding to the central portion of the predetermined shape, or to receive light existing in the region corresponding to the central portion of the predetermined shape. Provided is a coordinate input device that can invalidate the input of coordinates due to an object having a size smaller than that of an operation member, noise, etc. There is.

  Another object of the present invention is to enable input based on the coordinates associated with the received light receiving unit before determining whether the shape formed by the received light receiving unit is an effective shape. By determining whether or not the coordinates can be obtained and making the input of the coordinates valid when the coordinates are obtained, the input of the coordinates clearly due to the operation member can be easily validated. It is to provide a coordinate input device that can be used.

  Another object of the present invention is to determine whether or not the difference between the maximum value and the minimum value of the coordinates associated with the received light receiving unit is less than a predetermined value, thereby enabling effective input coordinates. It is an object of the present invention to provide a coordinate input device that can easily determine whether or not the above can be obtained.

  Another object of the present invention is to determine whether or not the shape formed by a part of the received light receiving portion is an effective shape, thereby facilitating the calculation easily and efficiently. It is to provide a coordinate input device.

  Still another object of the present invention is to display an image when the shape formed by the received light receiving portion is an effective first shape, and to erase the image when the shape is an effective second shape. Accordingly, an object of the present invention is to provide a coordinate input device and a handwriting input display device that can switch between display and deletion of an image by distinguishing the types of operation members.

  A coordinate input device according to the present invention is configured such that light emitted from a light emitting unit and reflected from an object is incident, and includes a plurality of light receiving units arranged in a matrix, and the light receiving unit receives a coordinate input. In the coordinate input device in which the coordinates are associated with each part, the coordinate input device includes shape determining means for determining whether or not the shape formed by the received light receiving part is an effective shape, and the shape determining means has an effective shape. If it is determined that there is a valid shape, the input of coordinates associated with the light receiving unit that forms the shape determined to be an effective shape is validated.

  In the coordinate input device according to the present invention, the shape determination unit includes a comparison unit that compares a shape formed by the received light receiving unit with a predetermined shape, and according to a comparison result of the comparison unit, It is characterized in that it is determined whether or not the shape formed by the received light receiving portion is an effective shape.

  In the coordinate input device according to the present invention, the comparing means includes presence determining means for determining whether or not the received light receiving portion exists in a region corresponding to an outer edge portion of the predetermined shape, and the shape The determining means determines that the shape formed by the received light receiving portion is an effective shape when the presence determining means determines NO.

  In the coordinate input device according to the present invention, the comparison unit further includes a number determination unit that determines whether or not a predetermined number or more of the received light receiving units exist in a region corresponding to the central part of the predetermined shape. The shape determining unit determines that the shape formed by the received light receiving unit is an effective shape when the presence determining unit determines NO and when the number determining unit is determined to exist. It is made to do so.

  In the coordinate input device according to the present invention, the comparing means determines whether or not the total value of the light receiving amounts of the light receiving portions existing in a region corresponding to the central portion of the predetermined shape is equal to or larger than a predetermined light amount. The shape determination unit is formed by the light receiving unit that receives light when the presence determination unit determines NO and the light amount determination unit determines that the light amount determination unit is greater than or equal to a predetermined light amount. It is characterized in that it is determined that the shape is an effective shape.

  The coordinate input device according to the present invention is configured to determine whether or not input effective coordinates can be obtained based on coordinates associated with the received light receiving unit before the determination by the shape determination unit. When it is determined that the validity determination unit is obtained, the input of the coordinates calculated based on the coordinates associated with the received light receiving unit is validated, and the determination by the shape determination unit is executed. It is characterized by not doing so.

  In the coordinate input device according to the present invention, the validity determination unit determines whether or not a difference between a maximum value and a minimum value of coordinates associated with the received light receiving unit is less than a predetermined value. It is characterized in that it is determined whether or not coordinates with valid input can be obtained.

  The coordinate input device according to the present invention is characterized in that the shape determining means determines whether or not a shape formed by a part of the received light receiving portion is an effective shape. To do.

  In the coordinate input device according to the present invention, the shape determining means determines whether the shape formed by the received light receiving portion is an effective first shape or an effective second shape. It is characterized by being.

  Whether the handwriting input display device according to the present invention has a display screen, includes an optical coordinate input device, and displays an image in an area including the coordinates handwritten to the coordinate input device of the display screen. Or, in the handwritten input display device for erasing the image displayed in the area, the coordinate input device is the coordinate input device of the present invention, and the coordinates input by the coordinate input device on the display screen are valid. An image is displayed in a region including the image, or an image displayed in the region is erased.

  In the handwriting input display device according to the present invention, when the coordinate input device is the coordinate input device of the present invention, and the shape determination unit of the coordinate input device determines that the first shape is effective, the display screen When the coordinate input device displays an image in an area including coordinates for which input is validated, and the shape determination means of the coordinate input device determines that the second shape is valid, the display screen The coordinate input device deletes the image displayed in the area including the coordinates for which the input is valid.

In the present invention, a coordinate input area is formed using a plurality of light receiving units arranged in a matrix, and the shape of the touch area generated when an operation member such as a pen or an eraser touches the coordinate input area. An effective shape is used, and a shape other than this shape (for example, a shape of a touch area that occurs when the user's hand touches the coordinate input area) is set as an invalid shape.
Each of the plurality of light receiving units receives light that is emitted from the light emitting unit and incident on the object when the object (specifically, an operation member, a user's hand, etc.) touches the coordinate input area, and further reflected from the object. Incident. The light emitting unit is, for example, a light emitting panel provided in the coordinate input device or a backlight of an LCD panel provided in the handwriting input display device.
In addition, for example, the coordinates of the x-axis and the y-axis are associated with each of the plurality of light receiving units.

The shape determining means of the coordinate input device determines whether or not the shape formed by the received light receiving part is an effective shape.
When the shape determining means determines that the shape formed by the received light receiving portion is an effective shape, the input of coordinates associated with the light receiving portion forming the shape determined to be an effective shape is effective. Is done.
On the other hand, when the shape determination unit determines that the shape formed by the received light receiving unit is an invalid shape, the coordinate input associated with the light receiving unit forming the shape determined to be an invalid shape is input. It is invalidated.

  The handwriting input display device including the coordinate input device of the present invention displays an image on a display screen in an area including coordinates for which the coordinate input device has validated input, or coordinates for which the coordinate input device has validated input. Erase the image displayed in the containing area. On the other hand, on the display screen, the handwriting input display device does not display an image in an area including coordinates where the coordinate input device invalidates input, and displays in an area including coordinates where the coordinate input device invalidates input. It does not erase the images that have been saved.

In the present invention, in order to determine whether or not the shape formed by the received light receiving unit is an effective shape, the comparison means of the coordinate input device, the shape formed by the received light receiving unit, Compare with a given shape. In this case, as a comparison result of the comparison means, for example, if the result formed by the received light receiving portion is congruent with the predetermined shape, or similar to the predetermined shape, the shape determination means Determines that the shape formed by the received light receiving portion is an effective shape.
That is, by comparing with the reference shape, it can be easily determined whether or not the shape formed by the received light receiving portion is an effective shape.

In the present invention, in order to compare the shape formed by the received light receiving portion with a predetermined shape, the comparison means of the coordinate input device has presence determination means.
The presence determining unit determines whether or not the received light receiving portion exists in a region corresponding to the outer edge portion of the predetermined shape with respect to the shape formed by the received light receiving portion.
When there is no received light receiving portion in the region corresponding to the outer edge portion of the predetermined shape, the shape determining means determines that the shape formed by the received light receiving portion is an effective shape. On the other hand, when the received light receiving portion exists in the region corresponding to the outer edge portion of the predetermined shape, the shape determining means determines that the shape formed by the received light receiving portion is an invalid shape.
In other words, by determining whether or not the shape formed by the received light receiving portion can be included in the central portion of the predetermined shape, it is possible to invalidate the input of coordinates by an object having a size larger than that of the operation member. .

In the present invention, in order to compare the shape formed by the received light receiving portion with a predetermined shape, the comparison means of the coordinate input device has presence determination means and number determination means.
The number determination means determines whether or not a predetermined number or more of the received light receiving portions exist in a region corresponding to the center portion of the predetermined shape with respect to the shape formed by the received light receiving portions.
If there is no received light receiving portion in the region corresponding to the outer edge portion of the predetermined shape, and there are more than a predetermined number of received light receiving portions in the region corresponding to the central portion of the predetermined shape, the shape determining means Determines that the shape formed by the received light receiving portion is an effective shape.

On the other hand, even if there is no received light receiving portion in the region corresponding to the outer edge portion of the predetermined shape, if there are less than a predetermined number of received light receiving portions in the region corresponding to the central portion of the predetermined shape, for example, Since the object smaller in size than the operation member touches the coordinate input area or the light reception of the light receiving unit is erroneously detected due to noise, the shape determining means has an invalid shape formed by the received light receiving unit. Is determined.
That is, with a simple configuration that counts the number of received light receiving portions, it is possible to invalidate the input of coordinates due to an object having a size smaller than the operation member, noise, or the like. Such a configuration is suitable when a light receiving unit that outputs a binary detection result is provided, but may be applied when a light receiving unit that outputs a multi-value detection result is provided.

In the present invention, in order to compare the shape formed by the received light receiving portion with a predetermined shape, the comparison means of the coordinate input device has presence determination means and light amount determination means.
The light amount determination means determines whether or not the total amount of light received by the light receiving portions existing in a region corresponding to the center portion of the predetermined shape is greater than or equal to a predetermined light amount for the shape formed by the received light receiving portion.
There is no received light receiving portion in the region corresponding to the outer edge portion of the predetermined shape, and the total value of the received light amount of the light receiving portions existing in the region corresponding to the central portion of the predetermined shape is greater than or equal to the predetermined light amount. In this case, the shape determining means determines that the shape formed by the received light receiving part is an effective shape.

On the other hand, even if there is no received light receiving portion in the region corresponding to the outer edge portion of the predetermined shape, the total amount of light received by the light receiving portions existing in the region corresponding to the central portion of the predetermined shape is less than the predetermined light amount. In some cases, for example, the object that is smaller than the operating member touches the coordinate input area, or the light received by the light receiving unit is erroneously detected due to noise. It is determined that the shape is correct.
That is, it is possible to invalidate the input of coordinates due to an object having a size smaller than that of the operation member, noise, or the like with a simple configuration in which the amounts of light received by the light receiving units are totaled. Such a configuration is suitable when a light receiving unit that outputs a multi-valued detection result is provided, but may be applied when a light receiving unit that outputs a binary detection result is provided.

In the present invention, in order to make it easy to effectively input the coordinates that are obviously due to the operation member, the validity determination means of the coordinate input device receives the light receiving unit that has received light before the determination by the shape determination means. It is determined whether or not coordinates with valid input can be obtained based on the coordinates associated with.
Since it is not necessary to determine whether or not the shape formed by the received light receiving unit is an effective shape when the input is obtained based on the coordinates associated with the received light receiving unit, The coordinate input device validates the input of coordinates calculated based on the coordinates associated with the received light receiving unit without executing the determination by the shape determining means. That is, based on the coordinates associated with the light receiving unit that has received light, it is possible to easily obtain coordinates for which input is effective.

  On the other hand, based on the coordinates associated with the received light receiving unit, if valid coordinates cannot be obtained, it is necessary to determine whether or not the shape formed by the received light receiving unit is an effective shape. Therefore, by executing the determination by the shape determining means, it is possible to obtain coordinates for which input is effective.

In the present invention, in order to determine whether or not coordinates with valid input can be obtained, the validity determination means of the coordinate input device includes the maximum value and the minimum value of the coordinates associated with the received light receiving unit. It is determined whether or not the difference is less than a predetermined value.
In particular, the difference between the maximum and minimum coordinates associated with the light receiving unit included in the touch area that occurs when the pen touches the coordinate input area is the touch area that occurs when the hand touches the coordinate input area, Or it is very small compared with the difference of the maximum value and minimum value of the coordinate associated with the light-receiving part contained in the area | region which combined both the touch area | region with a pen, and the touch area | region by hand. That is, when the difference between the maximum value and the minimum value of the coordinates associated with the received light receiving unit is less than the predetermined value, it is clear that the touch has been made with the pen.

Therefore, when the difference between the maximum value and the minimum value of the coordinates associated with the received light receiving unit is less than the predetermined value, the validity determination means clearly determines that the input valid coordinates can be obtained. In addition, it is possible to easily validate the input of coordinates that are based on the operation member.
Compared with the calculation to calculate the difference between the maximum and minimum coordinates, the shape is not a valid shape, so it can be determined by the shape determination means. If not executed as much as possible, the amount of calculation can be reduced, the calculation time can be shortened, and coordinate input can be received efficiently.

  In the present invention, the shape determining means determines whether or not the shape formed by a part of the received light receiving portion is an effective shape. That is, a part of the received light receiving part is used for calculation of determination by the shape determining means, and the remaining part is ignored. In this case, the calculation amount can be reduced, the calculation time can be shortened, and the determination can be made more efficiently than the configuration for determining whether or not the shape formed by all of the received light receiving portions is an effective shape. Can do.

In the present invention, for example, the shape of the touch area generated when the pen touches the coordinate input area is set as the effective first shape, and the shape of the touch area generated when the eraser touches the coordinate input area is effective. A shape other than the first shape and the second shape (for example, a shape of a touch area generated when a user's hand touches the coordinate input area) is an invalid shape. That is, the coordinate input device can distinguish between a touch by a pen and a touch by an eraser based on a difference in shape.
When the shape determination unit of the coordinate input device determines that the shape formed by the received light receiving portion is an effective first or second shape, the light receiving portion that forms the shape determined to be an effective shape The input of associated coordinates is validated.

  A handwriting input display device provided with a coordinate input device of the present invention displays an image on a display screen in an area including coordinates in which the coordinate input device validates input with respect to the first shape, and the coordinate input device has a second shape. The image displayed in the area including the coordinates for which the input is valid is deleted. That is, the image display mode and the image erasing mode can be switched by properly using the pen and the eraser. Therefore, since it is not necessary to operate a mode switch, for example, in order to switch between the image display mode and the image erasing mode, the convenience for the user can be improved.

In the case of the coordinate input device according to the present invention, it is determined whether or not the shape formed by the received light receiving unit is an effective shape. If the shape is an effective shape, coordinate input by an operation member such as a pen or an eraser is performed. As a result, the input coordinates can be validated. On the other hand, when the shape formed by the received light receiving unit is an invalid shape, the coordinate input by the user's hand has been performed, and thus the input coordinate can be invalidated.
As a result, it is not necessary to determine whether the input coordinates are valid based on the number of touched areas, the area, and the like, and it is possible to prevent erroneous detection with high accuracy for a coordinate input device including an area sensor. it can.

In the case of the handwriting input display device according to the present invention, an image is displayed on a display screen in an area including coordinates for which input is valid, or an image in this area is erased. Alternatively, erasure can be performed accurately.
On the other hand, since an image is not displayed in an area including coordinates where input is invalidated, or an image in this area is not erased, it is possible to prevent display or erasure of an unnecessary image based on erroneous detection. .

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

Embodiment 1.
FIG. 1 is a perspective view showing an appearance of a handwriting input display device according to Embodiment 1 of the present invention, and FIG. 2 is a block diagram showing a configuration of the handwriting input display device. FIG. 3 is a cross-sectional view schematically showing the arrangement of the LCD panel, area sensor, and backlight provided in the handwriting input display device, and FIG. 4 is a diagram of the coordinate input device provided in the handwriting input display device. It is a front view which shows a coordinate input area typically.
In FIG. 1, reference numeral 1 denotes a handwriting input display device. As shown in FIG. 1, the handwriting input display device 1 includes a display device 2 and a coordinate input device 3 that are integrally provided in a rectangular plate shape in a vertical posture. The pedestal 6 is supported from below.

The pedestal 6 includes a base 61 placed on the floor and two leg portions 62 and 62 erected on the upper surface of the base 61. The leg portions 62 and 62 are the base 61 and the display device. 2 and the coordinate input device 3 are connected, the scanner 51 is fixed to the upper part between the leg parts 62 and 62, and the printer 52 is placed on the upper surface of the base 61 between the leg parts 62 and 62. Further, a plurality of wheels (casters) 611, 611,... For facilitating the movement of the handwriting input display device 1 are arranged on the lower surface of the base 61.
A rectangular display screen 20 is provided on one surface of the display device 2, and the coordinate input device 3 is provided with a coordinate input region 30 so as to overlap the front view front side of the display screen 20.
The scanner 51 is provided with an introduction port 511 for introducing a document and a discharge port 512 for discharging the introduced document.

  As shown in FIGS. 2 and 3, the display device 2 includes a rectangular plate-like LCD panel 21 and a backlight (light emitting unit) 22 that illuminates the LCD panel 21 in its entirety. The side is the display screen 20.

  On the other hand, as shown in FIGS. 2 to 4, the coordinate input device 3 includes an area sensor 31. The area sensor 31 is arranged between the LCD panel 21 and the backlight 22 and is m × n (m, n is a natural number of m, n> 1. In the present embodiment, m = 2000, n = 1000). Each of the light receiving portions 4, 4,... Is used. Each light receiving unit 4 includes a minute optical sensor 41 that outputs a binary or multi-valued detection result corresponding to the amount of received light, and a light shielding unit 42 that is provided integrally with the optical sensor 41. .. Are arranged in a horizontal direction along the display screen 20 with the light sensors 41, 41,... Facing the LCD panel 21 and the light-shielding portions 42, 42,. Are arranged in a matrix of n vertical columns. The separation distance between the light receiving portions 4 and 4 is constant, and in the present embodiment, the light receiving portions 4, 4,... Are arranged at intervals of 0.5 mm.

Since the light emitted from the backlight 22 is blocked by the light blocking portion 42, it does not enter the optical sensor 41 directly.
The coordinate input area 30 is an area of the area sensor 31 on the side of the optical sensors 41, 41,... For this reason, the coordinate input area 30 that is actually touched by the pen P (or the eraser, which will be exemplified below) is the surface of the display screen 20 of the LCD panel 21. However, the LCD panel 21, the area sensor 31, and the backlight 22 are surrounded by a frame on the four sides, and the light receiving units 4 at both ends in the vertical direction are longer than the vertical length of the coordinate input area 30 that the pen P can touch. The separation distance between the light receiving units 4 and 4 is longer than the horizontal width of the coordinate input area 30.

As shown in FIG. 3, the light L1 emitted from the backlight 22 passes between the light receiving portions 4 and 4, passes through the LCD panel 21, and is emitted to the outside. However, when the pen P touches the display screen 20 (that is, the pen P touches the coordinate input area 30), the light L2 emitted from the backlight 22 and transmitted through the LCD panel 21 enters the pen P and is reflected from the pen P. Then, the light enters the optical sensors 41, 41,. Here, incidence of reflected light on the optical sensors 41, 41,... Occurs even if the object touching the coordinate input area 30 is an object other than the pen P, such as an eraser or a user's hand.
Further, since the separation distance between the light receiving portions 4, 4,... Is sufficiently small compared to the size of the tip of the pen P, when the pen P touches, a plurality of adjacent light receiving portions 4, 4,. Only one light receiving unit 4 does not receive light.

As shown in FIG. 4, the coordinates of the x-axis and the y-axis are associated with each light receiving unit 4. Specifically, i and j are assumed to be natural numbers of 1 ≦ i ≦ m and 1 ≦ j ≦ n. Then, coordinates (x _i , y _j ) are associated with the _i-th light receiving unit 4 from the left and the j-th light receiving unit 4 from the top (the light receiving unit 4 indicated by hatching in FIG. 4). In the present embodiment, x coordinates x ₁ = 1, x ₂ = 2,..., X _i = i,... X _m = m, and y coordinates y ₁ = 1, y ₂ = 2 _,. = J,... Y _n = n.
As shown in FIG. 2, the handwriting input display device 1 further includes an information processing unit 100. The information processing unit 100 includes a CPU 10, a ROM 11, a RAM 12, an HDD 13, and an LCD controller 14, and is disposed on the opposite side of the backlight 22 from the illumination side.

  The CPU 10 is a control center of the handwriting input display device 1, uses the RAM 12 as a work area, executes various processes according to the control program and data stored in the ROM 11, and performs handwriting input such as the display device 2 and the coordinate input device 3. The operation of each part of the display device 1 is controlled. For example, the CPU 10 controls a power supply circuit (not shown) of the backlight 22 to turn on / off the backlight 22 and increase / decrease the light emission amount.

  The detection result of the optical sensor 41 of each light receiving unit 4 is given to the CPU 10 from the area sensor 31. More specifically, for example, when a binary optical sensor 41 is used, if a detection signal having a predetermined voltage value is input from the optical sensor 41 to the CPU 10, the CPU 10 determines that the light receiving unit 4 is receiving light. When this detection signal is not input, it is determined that the light receiving unit 4 is not receiving light. On the other hand, when the multi-value optical sensor 41 is used, when a detection signal having a voltage value corresponding to the amount of light received by the optical sensor 41 is input from the optical sensor 41 to the CPU 10, the CPU 10 receives the light receiving unit 4. And the amount of light received by the optical sensor 41 is calculated based on the magnitude of the voltage value of the detection signal. When this detection signal is not input, it is determined that the light receiving unit 4 is not receiving light. .

The LCD controller 14 is for adjusting the voltage to be applied to the liquid crystal of the LCD panel 21, and the CPU 10 controls the operation of the LCD panel 21 via the LCD controller 14 to display an image on the display screen 20. Alternatively, the image displayed on the display screen 20 is deleted.
For example, image data is stored in the HDD 13.

For example, the user of the handwriting input display device 1 inserts a document into the introduction port 511 so that the scanner 51 reads the document.
The scanner 51 reads an image of a document introduced from the introduction port 511 and discharges it from the discharge port 512. Image data obtained by the scanner 51 reading an image of a document is given to the information processing unit 100, and the given image data is stored in the RAM 12. The CPU 10 displays an image based on the image data read from the RAM 12 on the display screen 20.
The user touches the coordinate input area 30 with the pen P while visually recognizing the image displayed on the display screen 20. Alternatively, a configuration may be adopted in which an image is not displayed on the display screen 20 at first, but a blank screen is displayed, and an image is displayed on the screen according to handwriting input by the pen P.

The CPU 10 obtains the coordinates of the position where the pen P touches the coordinate input area 30 based on the detection results of the light receiving units 4, 4,..., And displays a predetermined object (in the area including the obtained coordinates on the display screen 20). For example, a point image) is displayed. That is, the handwriting input display device 1 displays an image in an area including coordinates handwritten by the pen P on the coordinate input device 3 on the display screen 20. Therefore, for example, when the object displayed on the display screen 20 is a point image, the point image is continuously displayed when the user traces the surface of the display screen 20 with the pen P. Etc. are drawn easily.
However, as will be described later, the handwriting input display device 1 is configured not to display an object in an area including coordinates input by the user's hand to the coordinate input device 3 on the display screen 20.

The CPU 10 changes the image data stored in the RAM 12 in accordance with the change of the image displayed on the display screen 20.
Further, the CPU 10 reads out image data stored in the RAM 12 (that is, image data of an image displayed on the display screen 20) and supplies it to the printer 52.
The printer 52 given the image data forms an image on a recording sheet based on the given image data.

Further, the CPU 10 stores the image data given from the scanner 51 or the image data stored in the RAM 12 in the HDD 13 when the user operates a write button (not shown), for example. The image data stored in the HDD 13 is read from the HDD 13 and stored in the RAM 12 when the user operates a read button (not shown), for example, and an image based on this image data is displayed on the display screen 20.
The object displayed on the display screen 20 is not limited to a point image, and may be a fixed image such as a straight line image, a circular image, a triangular image, or a square image.

  In the present embodiment, as the coordinates of the position touched by the pen P, the coordinates of the center position of the area touched by the pen P are obtained. For this purpose, the CPU 10 calculates the input coordinates (X, Y) based on the x-coordinate and y-coordinate associated with the light receiving units 4, 4,... Received by the touch of the pen P, respectively. The average value X of the maximum value and the minimum value of the x coordinate and the average value Y of the maximum value and the minimum value of the y coordinate are calculated. Here, since the separation distance between the light receiving portions 4 and 4 at both ends in the vertical direction and the horizontal direction is longer than the vertical length and the horizontal width of the coordinate input area 30 that can be touched by the pen P, even if the pen P Even when the extreme end of the coordinate input area 30 is touched, the input coordinates are accurately calculated by the method of calculating the average value for each of the x coordinate and the y coordinate.

However, for example, when the user's hand touches or when the pen P and the hand touch simultaneously, the area touched by the hand is distinguished from the area touched by the pen P, and the area touched by the hand is related. It is necessary to invalidate the input of coordinates.
Further, the optical sensors 41, 41,... Detect only reflected light from the pen P (or an object touching the coordinate input area 30), and do not detect other light (for example, fluorescent light, sunlight, etc.). However, when other light is detected, a detection result as noise is given to the CPU 10, so that it is necessary to invalidate the input of coordinates due to noise.

  In particular, when the operation member is not the pen P but an eraser, it is necessary to invalidate not only an object having a dimension (or an area of a touch area) larger than that of the operation member but also input of coordinates by a small object. However, the procedure for invalidating the input of coordinates by an object larger in size than the operation member may be the same as the procedure for invalidating the input of coordinates related to the area touched by the user's hand, and the size is The procedure for invalidating the input of coordinates by a small object may be the same as the procedure for invalidating the input of coordinates by noise. For this reason, detailed description of these procedures is omitted.

Hereinafter, a configuration in which input of coordinates related to an area touched by the pen P is enabled and input of other coordinates is disabled will be described.
The pen P of the present embodiment has a thin cylindrical shape, and the shape formed by the light receiving portions 4, 4,... That receives light when the pen P touches the coordinate input area 30 is the outer diameter of the pen P. It has a corresponding circular shape. On the other hand, the shape formed by the light receiving parts 4, 4,... That receives light when an object other than the pen P touches the coordinate input area 30, such as the user's hand, fingertip, etc., is a circle corresponding to the outer diameter of the pen P Different from shape.
Hereinafter, a circular shape corresponding to the outer diameter of the pen P is referred to as an effective shape related to the pen P, or simply an effective shape.

  Therefore, when the shape formed by the received light receiving portions 4, 4,... (Hereinafter referred to as the light receiving shape) is an effective shape, the coordinate input by the pen P is performed, and therefore the coordinate input is effective. It can be judged. On the other hand, when the light receiving shape is a shape other than the effective shape, it is possible to determine that the input of coordinates is invalid because the coordinates are input by an object other than the pen P.

Incidentally, each of the received light receiving portions 4, 4,... Corresponds to a pixel forming a light receiving shape. In order to reduce the amount of calculation for determining whether the light-receiving shape is an effective shape and reduce the calculation time, the pixels forming the light-receiving shape are appropriately selected to reduce the amount of data used for the calculation. Thinned out. That is, the detection results of some of the light receiving units 4, 4,... Are used for the determination, and the detection results of the remaining light receiving units 4, 4,. In other words, it is determined whether or not the shape formed by a part of the received light receiving portions 4, 4,... Is an effective shape.
When thinning out the pixels, the pixels in the vertical direction (or the horizontal direction) may be thinned out regularly. For example, the thinning method may be changed between the outer edge portion and the central portion of the light receiving shape.

FIG. 5 is a front view schematically showing a state in which the pen touches the coordinate input area of the coordinate input device according to the first embodiment of the present invention. FIG. 6 shows the coordinate input area of the pen and the user. It is a front view which shows typically the state which touched simultaneously with the hand.
The shape formed by the light receiving parts 4, 4,... Received by touching the pen P corresponds to the light receiving shape PF shown in FIGS. In FIGS. 5 and 6, the light receiving shape PF with thinned pixels is not circular, but has a cross shape having a thickness of two pixels and a length of up to four pixels in the vertical and horizontal directions, respectively. Is shown as Therefore, in the following, an effective shape related to the pen P is shown as a cross shape having a thickness of two pixels and a length of four pixels.

Here, regarding the light receiving shape PF, if the minimum value x _a and the maximum value x _b of the x coordinate of the light receiving shape PF and the minimum value y _a and the maximum value y _b of the y coordinate are set, the minimum value and the maximum value of the x coordinate The difference D _x = x _b −x _a = 4, and the difference D _y = y _b −y _a = 4 between the minimum value and the maximum value of the y coordinate. The coordinates of the center position of the light receiving shape PF are coordinates (X, Y) = (D _x / 2, D _y / 2). If the obtained x-coordinate X (or y-coordinate Y) is not a natural number, the decimal part of the quotient of “D _x / 2” (or “D _y / 2”) is rounded off to a natural number, for example. Also good.
The shape formed by the light receiving portions 4, 4,... Received by the touch of the user's hand corresponds to the light receiving shape HF shown in FIG. The light receiving shape HF is significantly different from the effective shape related to the pen P. Here, the light receiving shape HF has a minimum value x _c (x _c > x _b ), a maximum value x _d , a minimum value y _c (y _a <y _c <y _b ), a maximum value of the x coordinate. _Let y _d (where y _d > y _b ).

As shown in FIG. 5, when only the pen P touches the coordinate input area 30, the difference D _x between the minimum value and the maximum value of the x coordinate is x _b − x _a = 4, and the difference D _y between the minimum value and the maximum value of the y-coordinate is y _b −y _a = 4.
On the other hand, as shown in FIG. 6, when the pen P and the user's hand touch the coordinate input area 30 simultaneously, the minimum value and the maximum value of the x-coordinate for all the received light receiving units 4, 4. The difference D _x between _x and y is x _d −x _a > 4, and the difference D _y between the minimum value and the maximum value of the y coordinate is y _d −y _a > 4.
When only the user's hand touches the coordinate input area 30, the difference D _x between the minimum value and the maximum value of the x coordinate is x _d −x _c > 4 and the difference D _y between the minimum value and the maximum value of the y coordinate is y _d −y _c > 4.

Therefore, when the object touches the coordinate input area 30, the difference D _x between the minimum value and the maximum value of the x coordinate for all the received light receiving parts 4, 4 _{,. xo} = 5) is less than, and, if it is less than the predetermined value difference D _y between the minimum and maximum values of the y-coordinate is the reference D _yo (e.g. D _yo = 5), receiving shape valid shape It is not necessary to determine whether or not there is, and coordinates (X, Y) = (D _x / 2, D _y / 2) are obtained as effective coordinates for input.
Even when D _x <D _xo and D _y <D _yo , when determining the shape, in order to determine the shape, it is more complicated than the calculation for obtaining the differences D _x and D _y in the procedure described later. Since it is necessary to perform calculation, the amount of calculation increases and the calculation time is extended.

Next, a procedure for determining whether or not the light receiving shape is an effective shape will be described.
FIG. 7 is a front view schematically showing a determination matrix used for determining the validity / invalidity of the shape in the coordinate input device according to Embodiment 1 of the present invention.
FIG. 8 is a schematic front view for explaining the validity / invalidity determination of the shape. The light receiving shape F shown in FIG. 8A is a light receiving shape by the touch of the pen P, and the light receiving shape F shown in FIG. 8B is a light receiving shape due to noise, and the light receiving shape shown in FIG. 8C. A shape F is a light receiving shape by a user's hand touch.
Further, FIG. 9 is a schematic front view for explaining scanning of the coordinate input area for determining the validity / invalidity of the shape.

In order to determine whether or not the light receiving shape is an effective shape, the received shape is compared with a predetermined shape. The predetermined shape is a similar shape having a size larger than the effective shape of the pen P. That is, the predetermined shape can include an effective shape related to the pen P in the central portion.
A pixel group corresponding to the predetermined shape is referred to as a determination matrix J in the present embodiment. The determination matrix J is shown in FIG. 7 as a cross shape having a thickness of 4 pixels and a length of 6 pixels at the maximum in the vertical and horizontal directions. The determination matrix J has an outer edge portion JO and a central portion JI surrounded by the outer edge portion JO, and the shape of the central portion JI is an effective shape related to the pen P.
Using such a determination matrix J, the coordinate input area 30 is scanned as shown in FIG.

First, the CPU 10 sets the pixel group corresponding to the pixel group constituting the determination matrix J at the upper left end of the coordinate input area 30 as the target pixel group A, and the pixel group (that is, the determination matrix J) at the outer edge of the target pixel group A. It is determined whether or not at least one light receiving unit 4 corresponding to each pixel in the pixel group corresponding to the outer edge portion JO is receiving light.
It can be seen that the light receiving shape F shown in FIG. 8B is not an effective shape because the four light receiving portions 4, 4,... That is, it is determined that the light receiving shape by the touch of the user's hand is an invalid shape, and the input of coordinates relating to this shape is invalidated.
On the other hand, the light receiving shapes F and F shown in FIGS. 8A and 8C are effective because all the light receiving portions 4, 4,... The shape may be different.

In the configuration using the binary optical sensors 41, 41,..., When it is determined that all the light receiving units 4, 4,... , The number of light receiving portions 4, 4,... Among the light receiving portions 4, 4,... Related to the pixel group at the center of the target pixel group A (that is, the pixel group corresponding to the center portion JI of the determination matrix). Is equal to or greater than a predetermined number (for example, four).
It can be seen that the light receiving shape F shown in FIG. 8C is not an effective shape because only one light receiving portion 4 is received in the central pixel group of the target pixel group A. That is, it is determined that the light receiving shape due to noise is an invalid shape, and the input of coordinates related to this shape is invalidated.

On the other hand, the light receiving shape F shown in FIG. 8A is an effective shape because the four light receiving portions 4, 4,... Receive light in the central pixel group of the pixel group A of interest. Recognize. That is, it is determined that the light receiving shape by the touch of the pen P is an effective shape, and the input of coordinates relating to this shape is enabled.
After the determination for the target pixel group A is completed, the position of one column is shifted to set a new target pixel group A, and the same determination is repeated for the set pixel group until the upper right end is reached. In addition, by shifting the position by one row and setting a new target pixel group A and performing the same determination on the set pixel group until reaching the lower right end, the entire coordinate input area 30 Is determined.

FIG. 9B shows a state where the light receiving shape due to the touch of the pen P is recognized by performing the above scanning. 9B, the light receiving shape F shown in FIG. 9B is not received by all the light receiving portions 4, 4,... In the outer edge portion of the pixel group A of interest, and the central portion of the pixel group A of interest. Since the twelve light-receiving portions 4, 4,... That is, this light receiving shape is a light receiving shape by the touch of the pen P, and the input of coordinates relating to this shape is valid.
After the effective shape is recognized, it is not necessary to scan the area of the coordinate input area 30 that has not yet been scanned. However, when scanning is performed, for example, simultaneous scanning with a plurality of pens P, P,. Coordinate input can be accepted.

By the way, the target pixel group A is set in a state where the entire determination matrix J is included in the coordinate input area 30. For this reason, scanning of the coordinate input area 30 is performed from the coordinates (x _js , y _js ) of the center position of the determination matrix J when the determination matrix J is arranged at the upper left end of the coordinate input area 30. _Are executed up to the coordinates (x _je , y _je ) of the center position of the determination matrix J when the determination matrix J is arranged at the lower right corner of
Hereinafter, the coordinates of the center position of the target pixel group A are referred to as target coordinates.

10 and 11 are flowcharts showing a procedure of object display processing executed by the handwriting input display device according to Embodiment 1 of the present invention.
The CPU 10 determines whether or not at least one of the light receiving units 4, 4,... Has received light (S11). If all the light receiving units 4, 4,. Repeat the process.
When at least one of the light receiving units 4, 4,... Receives light (YES in S11), the CPU 10 determines the difference D _x between the minimum value and the maximum value of the x coordinate for all the received light receiving units 4, 4,. calculates (S12), the difference D _x is equal to or less than the predetermined value D _xo (S13).

When D _x <D _xo (YES in S13), the CPU 10 calculates a difference D _y between the minimum value and the maximum value of the y coordinate for all the received light receiving units 4, 4,... (S14), the difference D _y is equal to or less than the predetermined value D _yo (S15).
If D _y <D _yo (YES in S15), the CPU 10 determines the average value X of the maximum value and the minimum value of the x coordinate and the maximum value of the y coordinate for all the received light receiving units 4, 4,. The coordinates (X, Y) are calculated by calculating the average value Y with the minimum value (S16), and the coordinates (X, Y) on the display screen 20 are set as the effective coordinates (X, Y). ) Is displayed in the area including () (S17).
After completing the process of S17, the CPU 10 returns the process to S11.

If D _x ≧ D _xo (NO in S13) or D _y ≧ D _yo (NO in S15), the CPU 10 substitutes “x _js ” for the x coordinate x _o of the _target coordinate (S18). ), is substituted for "y _js" to the y-coordinate y _o of the attention coordinates (S19).
Then CPU10 is attention coordinates (x _o, y _o) sets the target pixel group A centered position (S31), the light receiving portions 4, 4 corresponding to the outer edge of the target pixel group A set, ... of Then, it is determined whether or not the received light receiving unit 4 exists (S32).
If the received light receiving portion 4 does not exist corresponding to the outer edge portion of the target pixel group A set in S31 (NO in S32), the CPU 10 receives the light receiving portion corresponding to the central portion of the target pixel group A set in S31. Is determined whether there are a predetermined number or more of the received light receiving portions 4, 4,... (S33).

When there are a predetermined number or more of the received light receiving parts 4, 4,... (YES in S33), since the target pixel group A has an effective shape, the CPU 10 receives the light receiving parts 4, 4, corresponding to the target pixel group A. ... Of the received light receiving parts 4, 4,... By calculating an average value X of the maximum and minimum values of the x coordinate and an average value Y of the maximum and minimum values of the y coordinate, respectively. X, Y) is calculated (S34), and the calculated coordinate (X, Y) is used as an effective coordinate, and the object is displayed in the area including the coordinate (X, Y) on the display screen 20 (S35).
After completing the process of S35, the CPU 10 returns the process to S11.

The light receiving unit 4 corresponding to the central part of the target pixel group A set in S31 or when the received light receiving unit 4 exists corresponding to the outer edge portion of the target pixel group A set in S31 (YES in S32). , 4,..., When there are less than a predetermined number of received light receiving parts 4, 4,... (NO in S33), the target pixel group A is not an effective shape, and the CPU 10 It is determined whether or not the x coordinate x _o is smaller than “x _je ” (S 36). If x _O <x _je (YES in S 36), the coordinate of interest has not reached the right end, so the x coordinate x _o is incremented by “1” (S37), and the process proceeds to S31.

Since the case of x _O = x _je (NO in S36), attention coordinates has reached the right end, y coordinate y _o of interest coordinates determines whether "y _je" is smaller than (S38), y _O < If it is y _je (YES in S38), the coordinate of interest has not reached the lower end, so “x _js ” is substituted for x coordinate x _o (S39), and y coordinate _yo is incremented by “1”. (S40), the process proceeds to S31.
If y _O = y _je (NO in S38), the target coordinate has reached the lower right end (that is, the scanning of the coordinate input area 30 has ended), and the process returns to S11.

The CPU 10 in the object display process as described above functions as a shape determination unit. The CPU 10 in S32 and S33 functions as a comparison unit, the CPU 10 in S32 functions as a presence determination unit, and the CPU 10 in S33 functions as a number determination unit. Further, the CPU 10 in S13 and S15 functions as a validity determination unit.
In S17 and S35, the object may be deleted instead of displayed. In this case, whether the object is displayed or deleted is determined by, for example, the user operating a display / erase switching button (not shown).
Further, S32 and S33 may be executed in the reverse order of this order.

In the configuration using the multi-value optical sensors 41, 41,..., When it is determined that all the light receiving units 4, 4,. The CPU 10 determines whether or not the total light reception amount of the light receiving units 4, 4,... Related to the central pixel group of the target pixel group A is greater than or equal to a predetermined light amount.
The light receiving shape F shown in FIG. 8C is an effective shape because the total amount of light received by the light receiving portions 4, 4,... In the central pixel group of the target pixel group A is less than a predetermined light amount. I understand that there is no. That is, it is determined that the light receiving shape due to noise is an invalid shape, and the input of coordinates related to this shape is invalidated.

  On the other hand, the light receiving shape F shown in FIG. 8A is effective because the total amount of light received by the light receiving units 4, 4,... It turns out that it is a shape. That is, it is determined that the light receiving shape by the touch of the pen P is an effective shape, and the input of coordinates relating to this shape is enabled. However, even with the light receiving shape as shown in FIG. 8 (a), if the detection results of the individual light receiving portions 4, 4,... Are very small, the total amount of received light is less than the predetermined amount of light and the shape is invalid. The

  In the object display processing when the multi-value optical sensors 41, 41,... Are used, the total light reception amount of the light receiving units 4, 4,. What is necessary is just to determine whether it is more than a predetermined light quantity. In this case, the CPU 10 in S33 functions as a light amount determination unit. In S33, before calculating the total value of received light amount, two or more received light receiving units 4, 4,... Among the light receiving units 4, 4,. It may be determined whether or not it exists, and if it does not exist, it may be determined that the total amount of received light is less than a predetermined light amount without calculating the total amount of received light. Further, of the light receiving portions 4, 4,... Corresponding to the central portion of the target pixel group A, the light receiving amounts of the light receiving portions 4, 4,. A total value may be calculated.

  The handwriting input display device 1 as described above can validate the coordinate input by the pen P while invalidating the coordinate input by the user's hand, noise, and the like with a simple procedure.

Embodiment 2. FIG.
The handwriting input display device 1 according to the present embodiment has substantially the same configuration as the handwriting input display device 1 according to the first embodiment, but the coordinate input area 30 selects whether to display or erase an object. The determination is made according to whether the pen P touches or the eraser touches.
The eraser of the present embodiment is a rectangular flat plate whose longitudinal length and lateral width are sufficiently longer than the outer diameter of the pen P, and the light receiving units 4, 4,... That receive light when the eraser touches the coordinate input area 30. The shape formed by is a rectangular shape corresponding to the length and width of the eraser. Hereinafter, a rectangular shape corresponding to the size of the eraser is referred to as an effective shape related to the eraser, or simply an effective shape.

Therefore, the determination procedure for determining whether the light receiving shape is an effective shape related to the eraser is to use the determination matrix J as the determination matrix JE corresponding to the eraser, and to determine the predetermined values D _xo , D _yo , the predetermined number, the predetermined light amount, etc. If the numerical value corresponding to is replaced, the procedure for determining whether or not the light receiving shape is an effective shape related to the pen P is exactly the same.
FIG. 12 is a front view schematically showing a basic form of a determination matrix used for determining the validity / invalidity of a shape in the coordinate input device according to the second embodiment of the present invention. FIG. It is a front view which shows typically the determination matrix used for determination of the validity / invalidity of a shape.
Since the pen P has a circular shape, the effective shape related to the pen P is not limited to the inclination of the pen P in the coordinate input area 30 and is substantially constant. However, since the effective shape related to the eraser is rectangular, it is necessary to use a different determination matrix JE depending on the inclination in the coordinate input area 30 of the eraser.

The basic shape of the determination matrix JE is shown in FIG. 12 as a rectangular shape having a vertical length of 11 pixels and a horizontal width of 6 pixels. The determination matrix JE has an outer edge portion JO and a central portion JI surrounded by the outer edge portion JO. The shape of the central portion JI is an effective shape related to the eraser (specifically, the vertical length of nine pixels and the pixel 4). A rectangular shape having a horizontal width).
In the present embodiment, such a determination matrix JE and four types of determination matrices JE ₀ , JE ₄₅ , JE _{90 in which} the determination matrix JE is inclined at 45 °, 90 °, and 135 ° in the coordinate input area 30, respectively. , JE ₁₃₅ , an object erasure process is executed.

  The object erasure process is substantially the same as the object display process of the first embodiment, but in S16 and S34, coordinates input associated with all the light receiving units 4, 4,... Included in the area touched by the eraser are input. The difference is that, in S17 and S35, the image displayed in the area including the coordinates validated in S16 and S34 is erased. That is, on the display screen 20, the image displayed in the rectangular area touched by the eraser is deleted.

The CPU 10 executes the object display process for the determination matrix J corresponding to the pen P, and if the input of valid coordinates is not detected, the CPU 10 executes the object deletion process for the determination matrix JE ₀ corresponding to the eraser and inputs the valid coordinates. Is not detected, the object erasure process is executed for the determination matrix JE ₄₅ . Thereafter, the CPU 10 executes the same processing for the determination matrices JE ₉₀ and JE ₁₃₅ .
Accordingly, when an effective coordinate input is detected when the object display process is executed, the object is displayed on the display screen 20, and when an effective coordinate input is detected when the object deletion process is executed, the object is displayed. The image displayed on the screen 20 is deleted.

  Other parts corresponding to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The handwriting input display device 1 as described above uses the effective shape related to the pen P as the effective first shape and uses the effective shape related to the eraser as the effective second shape, and receives the light receiving unit 4. , 4,..., 4,... Are judged to be valid first shapes or valid second shapes, and if they are valid first shapes, an image is displayed and valid. If the shape is the second shape, the image is erased. Moreover, the handwriting input display device 1 does not display or erase an image when neither the effective first shape nor the effective second shape is present.

Therefore, the user can easily switch between displaying and erasing an image by properly using the pen P and the eraser. In addition, it is possible to prevent unnecessary image display and erasure due to an object other than the pen P and the eraser touching the coordinate input area 30.
In addition, if the angle at which the determination matrix JE is tilted is not in increments of 45 °, for example, in increments of 30 °, more accurate determination is possible.

It is a perspective view which shows the external appearance of the handwriting input display apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the handwriting input display apparatus which concerns on Embodiment 1 of this invention. It is a cross-sectional view which shows typically arrangement | positioning of the LCD panel with which the handwriting input display apparatus which concerns on Embodiment 1 of this invention, an area sensor, and a backlight are provided. It is a front view which shows typically the coordinate input area of the coordinate input device with which the handwriting input display apparatus which concerns on Embodiment 1 of this invention is provided. It is a front view which shows typically the state which the pen touched the coordinate input area | region of the coordinate input device which concerns on Embodiment 1 of this invention. It is a front view which shows typically the state which the pen and the user's hand touched simultaneously in the coordinate input area of the coordinate input device which concerns on Embodiment 1 of this invention. It is a front view which shows typically the determination matrix used for determination of the validity / invalidity of a shape in the coordinate input device which concerns on Embodiment 1 of this invention. It is a typical front view explaining the determination of the validity / invalidity of the shape in the coordinate input device which concerns on Embodiment 1 of this invention. It is a typical front view explaining the scanning of the coordinate input area | region for determining the validity / invalidity of a shape in the coordinate input device which concerns on Embodiment 1 of this invention. It is a flowchart which shows the procedure of the object display process performed with the handwriting input display apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows the procedure of the object display process performed with the handwriting input display apparatus which concerns on Embodiment 1 of this invention. It is a front view which shows typically the basic form of the determination matrix used for determination of the validity / invalidity of a shape in the coordinate input device concerning Embodiment 2 of this invention. It is a front view which shows typically the determination matrix used for the valid / invalid determination of a shape in the coordinate input device which concerns on Embodiment 2 of this invention.

Explanation of symbols

1 Handwritten input display device 10 CPU
20 Display screen 22 Backlight (light emitting part)
3 Coordinate input device 4 Light receiving part L2 light (light reflected from the object)
P Pen (object)

Claims (11)

The light emitted from the light emitting part and reflected from the object is incident, and includes a plurality of light receiving parts arranged in a matrix,
In the coordinate input device in which coordinates are associated with each of the light receiving units in order to accept input of coordinates,
A shape determining means for determining whether or not the shape formed by the received light receiving portion is an effective shape;
When the shape determining means determines that the shape is an effective shape, the input of coordinates associated with the light receiving unit forming the shape determined to be an effective shape is enabled. Coordinate input device. The shape determination means includes
Comparing means for comparing the shape formed by the received light receiving portion with a predetermined shape;
2. The coordinate input device according to claim 1, wherein it is determined whether or not the shape formed by the received light receiving portion is an effective shape according to a comparison result of the comparison means. . The comparison means includes presence determination means for determining whether or not the received light receiving portion exists in a region corresponding to the outer edge portion of the predetermined shape,
3. The shape determination unit according to claim 2, wherein when the presence determination unit determines NO, the shape formed by the received light receiving unit is determined to be an effective shape. The coordinate input device described. The comparison means further includes a number determination means for determining whether or not there are a predetermined number or more of the received light receiving portions in an area corresponding to the central portion of the predetermined shape,
The shape determining means determines that the shape formed by the received light receiving portion is an effective shape when the presence determining means determines NO and when the number determining means is determined to exist. The coordinate input device according to claim 3, wherein the coordinate input device is configured as follows. The comparison unit further includes a light amount determination unit that determines whether or not a total light reception amount of the light receiving unit existing in an area corresponding to a central portion of the predetermined shape is equal to or greater than a predetermined light amount.
The shape determining unit determines that the presence determining unit determines NO, and when the light amount determining unit determines that the light amount determining unit is greater than or equal to a predetermined light amount, the shape formed by the received light receiving unit is an effective shape. The coordinate input device according to claim 3, wherein the coordinate input device is determined. Before the execution of the determination by the shape determination means, it comprises an effective determination means for determining whether or not an input valid coordinate is obtained based on the coordinates associated with the received light receiving unit,
When it is determined that the validity determining means can be obtained, the input of coordinates calculated based on the coordinates associated with the received light receiving unit is validated, and the determination by the shape determining means is not executed. The coordinate input device according to any one of claims 1 to 5, wherein   Whether the valid determination means obtains coordinates for which input is valid by determining whether or not a difference between a maximum value and a minimum value of coordinates associated with the received light receiving unit is less than a predetermined value. The coordinate input device according to claim 6, wherein it is determined whether or not.   8. The shape determination unit according to claim 1, wherein the shape determination means determines whether or not a shape formed by a part of the received light receiving portion is an effective shape. The coordinate input device described in one.   The shape determining means is configured to determine whether or not the shape formed by the received light receiving portion is an effective first shape or an effective second shape. Item 9. The coordinate input device according to any one of Items 1 to 8. Has a display screen,
Equipped with optical coordinate input device,
In the handwriting input display device that displays an image in an area including coordinates input by handwriting on the coordinate input device of the display screen or erases an image displayed in the area,
The coordinate input device is the coordinate input device according to any one of claims 1 to 9,
The handwriting input display device, wherein the coordinate input device of the display screen displays an image in an area including coordinates for which input is valid, or erases the image displayed in the area . The coordinate input device is a coordinate input device according to claim 9,
When the shape determining means of the coordinate input device determines that the first shape is valid, the coordinate input device of the display screen displays an image in a region including the coordinates for which the input is valid,
When the shape determining unit of the coordinate input device determines that the second shape is valid, the image displayed on the display screen in the area including the coordinates for which the coordinate input device has validated input is erased. The handwritten input display device according to claim 10, wherein

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