KR101142270B1 - Handwriting input device having the document editting function and method thereof - Google Patents

Abstract

The present invention relates to a handwriting input device having a document editing function and a method thereof, and a technical problem to be solved is to display the text of the first display unit in synchronization with the second display unit, and drag the text of the second display unit to the handwriting display unit. When placed, the text to be edited is enlarged and displayed on the handwriting display unit, so that the text can be easily input and edited.

To this end, the present invention displays an input unit for writing by a user, a writing detecting unit detecting a writing input on the input unit, a writing input on the input unit, and a handwriting display unit formed in the same area as the input unit and detecting the writing unit. At least one text selected from the first display unit displaying the text corresponding to the written handwriting, the second display unit displaying the same text as the text displayed on the first display unit, and the text displayed on the second display unit in synchronization with the first display unit. A drag detection unit that detects that the handwriting display unit has been dragged, and displays the handwriting detected by the handwriting detection unit on the handwriting display unit, converts the handwriting detected by the handwriting detection unit into text, and displays the handwriting display unit on the first display unit and the second display unit, The text dragged from the second display unit to the handwriting display unit is enlarged and displayed. When the home, and starts writing the display, the handwriting input device having a document editing function consisting of a control unit for displaying the edited result to the first display unit and second display unit and a method thereof.

Description

HANDWRITING INPUT DEVICE HAVING THE DOCUMENT EDITTING FUNCTION AND METHOD THEREOF}

The present invention relates to a handwriting input device having a document editing function and a method thereof.

In general, the terms and products of touch panel or touch screen were originally developed for military use. Since then, it has been used for a long time in the military, electronics and IT industries. It has been closely used in real life since early 2000. In the early stages of industrial applications, monitors using a touch interface were mainly employed in kiosks.

As the number of drivers using car navigation has increased since 2000, the demand for touch screens in small information devices has been triggered. From 2007, Apple's "iPhone" and LG's "pradaphone" In addition, smartphones and premium mobile phones have been adopted as display parts for UI (User Interface) enhancement. Touch screens have been adopted in portable mobile devices such as navigation, mobile phones and MP3Ps because of their rapid use in terms of supply and demand.

In addition, the implementation technology (method) of the touch panel / screen is largely divided into a resistive method, a capacitance method, an ultrasonic method, an infrared method, and other methods. Application areas are also distinguished by method. Resistive and capacitive touch panels are commonly used in small portable devices such as smartphones / navigations.

Resistive coatings have traditionally been used in touch mobile phones for their ease of implementation and low cost. In addition, since a method of detecting a change in resistance formed by a predetermined pressure, there is an advantage suitable for the use of a stylus pen.

On the other hand, the capacitive method has traditionally been known to be unsuitable for touch mobile phones, but has recently been applied to touch mobile phones because of its excellent light transmittance and durability. In addition, Samsung Electronics, a huge consumer, recently decided to increase the proportion of capacitive mobile phones from 2010, and Windows 7, the next generation OS that supports multi-touch, was released in late October 2009. Panel growth is expected to stand out.

However, since the capacitive touch panel is a method of directly inputting handwriting by a finger, it is difficult to have a precise pointing device, and moreover, when the touch panel does not have a direction key function, it is very difficult to accurately select and edit between letters.

For example, to modify a specific word in the edit screen, move the cursor before or after the word, drag to select the word, and then enter another word. To modify only a specific letter of the word, Characters must be deleted by moving the cursor forward or backward. Due to the nature of the capacitive method, such elaboration is difficult.

In addition, since the handwriting input function is merely used for input, there is no function for editing such as moving and moving the cursor to add and delete characters, and therefore, always provide the keyboard with the enter key or the space key for handwriting input. There is discomfort.

According to the present invention, when the text of the first display unit is displayed in synchronization with the second display unit, and the text of the second display unit is dragged to the input unit and the handwriting display unit, the text to be edited is enlarged and displayed on the input unit and the handwriting display unit. A handwriting input device having a document editing function capable of easily editing text in a display portion, and a method thereof.

The present invention provides a handwriting input device having a document editing function that can easily edit text displayed on the input unit and the handwriting display unit by various gesture operations, and a method thereof.

According to the present invention, when the second display unit is dragged in the left and right directions, a character located on the left or right side of the character to be edited is displayed on the input unit and the handwriting display unit, so that a text editing function can be easily edited at any time during handwriting input. A handwriting input device having a method and a method thereof are provided.

Handwriting input device having a document editing function according to the present invention comprises an input unit for writing by the user; A handwriting detector for sensing handwriting input to the input unit; A handwriting display unit which displays handwriting inputted to the input unit and is formed in the same area as the input unit; A first display unit which displays text corresponding to the handwriting detected by the handwriting detection unit; A second display unit which displays the same text as the text of the first display unit in synchronization with the first display unit; A drag detection unit to detect whether at least one text is selected from the text displayed on the second display unit and dragged to the handwriting display unit; And a control to enlarge and display the text dragged from the second display unit to the handwriting display unit and to display the editing result on the handwriting display unit, the first display unit, and the second display unit when the text of the handwriting display unit is edited by the input unit. It includes.

The text of the handwriting display unit may be displayed to be enlarged 1.5 to 7 times larger than the corresponding text of the first display unit and the second display unit.

The text of the handwriting display unit may be enlarged by 1.5 to 10 times compared to the corresponding text of the first display unit and the second display unit.

A gesture detecting unit may further include a gesture detecting unit configured to detect a gesture input to the input unit, and the controller may perform editing corresponding to the gesture when the gesture is applied to text of the writing display unit.

The gesture is an operation of dragging the dragged text from the right to the left direction or from the left to the right direction, whereby the dragged text may be deleted.

The gesture is an operation of dragging the text spaced apart from each other in a semicircle shape from right to left or from a semicircle shape from left to right, whereby the spaced text may be connected to each other.

The gesture is an operation of dragging a specific letter of the dragged text from the top to the bottom direction or from the bottom to the top direction, whereby the dragged letter can be deleted.

When the control unit drags the text displayed on the second display unit from the right side to the left side, the text positioned on the right side centering on the text of the handwriting display unit may be displayed on the handwriting display unit.

When the control unit drags the text displayed on the second display unit from left to right, the text located on the left side of the text on the handwriting display unit may be displayed on the handwriting display unit.

The text loaded by the user may be displayed on the first display unit and the second display unit.

The controller may display the writing detected by the writing detection unit on the writing display unit as it is, and convert the writing detected by the writing detection unit to text and display the writing on the first display unit and the second display unit.

The second display unit may be formed below the first display unit, and the input unit and the writing display unit may overlap each other below the second display unit.

A handwriting input method having a document editing function according to the present invention may include a first step of determining whether a handwriting sensing unit detects handwriting through an input unit; If it is determined that the handwriting is detected, a second step of displaying the handwriting through the handwriting display unit and converting the handwriting into text and displaying the handwriting on the first display unit and the second display unit; Determining whether the text of the second display unit is dragged to the handwriting display unit by a drag detection unit; And when the text of the second display unit is dragged onto the handwriting display unit, expanding and displaying the text dragged on the handwriting display unit.

A fifth step of determining whether a gesture detection unit detects a gesture through the input unit; And performing a editing corresponding to the gesture and simultaneously displaying an editing result on the writing display unit, the first display unit, and the second display unit.

The gesture of the fifth step is an operation of dragging the dragged text from the right to the left direction or from the left to the right direction. Accordingly, in the sixth step, the text of the handwriting display unit and the corresponding first display unit and the The text of the second display unit may be deleted.

The gesture of the fifth step is an operation of dragging the text spaced apart from each other into a semicircle shape from right to left or a semicircle shape from left to right. The text may be connected to each other in the first display unit and the second display unit.

The gesture of the fifth step is an operation of dragging a specific letter of the dragged text from the top to the bottom direction or from the bottom to the top direction. Accordingly, in the sixth step, the dragged letter of the writing display unit is deleted, and the corresponding text is deleted. The letters of the first display unit and the second display unit may be deleted.

According to the present invention, when the text of the first display unit is displayed in synchronization with the second display unit, and the text of the second display unit is dragged to the input unit and the handwriting display unit, the text to be edited is enlarged and displayed on the input unit and the handwriting display unit. The text on the display can be easily edited.

The present invention can easily edit the text displayed on the input unit and the handwriting display unit by various gesture operations.

According to the present invention, when the second display unit is dragged in the left and right directions, a character positioned on the left or right side of the character to be edited is displayed on the input unit and the handwriting display unit, so that the text can be easily edited at any time during the handwriting input.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

1 is a schematic diagram showing an example of a touch panel to which a handwriting input device having a document editing function according to the present invention is applied.

As illustrated in FIG. 1, the touch panel or the touch screen 10 to which the writing input device having a document editing function is applied includes a first display unit 170, a second display unit 180, and an input unit 110 formed in the same area. The handwriting display unit 160 is included. That is, the second display unit 180 is formed under the first display unit 170 of the touch panel or the touch screen 10, and the input unit 110 and the handwriting display unit under the second display unit 180. 160 is formed by overlapping.

The first display unit 170 is an area in which text currently input and edited is displayed, and the second display unit 180 is synchronized with the first display unit 170 so that the same text as that of the first display unit 170 is displayed. This area is displayed. In addition, the first display unit 170 is also an area in which text loaded by a user is displayed. In this case, the second display unit 180 is synchronized with the first display unit 170 and the first display unit 170. The same text as in is displayed.

The input unit 110 is an area in which handwriting or a gesture by a user is input. Since the touch panel 10 is capacitive, the writing and gesture can be performed by a user's finger. Of course, when the touch panel 10 is a resistive method, writing or gesture input by a stylus is also possible. In addition, the handwriting display unit 160 overlapping with the input unit 110 displays the handwriting and gestures by the user. In addition, as will be described again below, the handwriting display unit 160 may display the text of the second display unit 180 for editing.

In this writing, in order to display a specific text on the first display unit 170 and the second display unit 180, a letter, a number, or a special symbol is displayed on the input unit 110 with a hand or a stylus (writing, writing). ).

In addition, the gesture is a picture (drag, drag) a specific pattern on the input unit 110 with a hand or a stylus so that a predetermined function (delete text, concatenation of spaced text, delete letters, etc.) is applied to the selected text. Means.

2 is a block diagram showing the configuration of a handwriting input device having a document editing function according to the present invention.

As shown in FIG. 2, the handwriting input device 100 having a document editing function according to the present invention may include an input unit 110, a handwriting detection unit 120, a gesture detection unit 130, a drag detection unit 140, The controller 150 includes a handwriting display unit 160, a first display unit 170, and a second display unit 180.

The input unit 110 is an area in which handwriting or gestures are input by a user. As described above, handwriting is input to the input unit 110 to input or edit text, or a gesture is input so that a predetermined function is applied to the text.

The handwriting detector 120 detects the handwriting inputted to the input unit 110 and transmits the result to the controller 150.

The gesture detecting unit 130 detects a gesture input to the input unit 110 and transmits the result to the control unit 150.

The drag detection unit 140 detects whether a specific text is dragged from the second display unit 180 to the input unit 110 (that is, the handwriting display unit 160) and is moved, and controls the result of the control unit 150. To pass).

The controller 150 includes a memory 151 in which a handwriting-text data table for handwriting recognition and a gesture-editing command data table for gesture recognition are stored. The controller 150 compares the writing data detected by the writing detection unit 120 with text stored in the memory 151, and converts the writing into text. In addition, the controller 150 compares the gesture data detected by the gesture detector 130 with an edit command stored in the memory 151 and performs a predetermined edit command corresponding to the gesture.

Particularly, the controller 150 displays the specific text dragged and moved to the input unit 110 (that is, the handwriting display unit 160) based on the drag detection signal detected by the drag detection unit 140. The image is enlarged 7 times and displayed on the input unit 110 (ie, the handwriting display unit 160).

The handwriting display unit 160 displays the handwriting according to the handwriting input to the input unit 110. That is, the handwriting display unit 160 displays handwriting by the user as received from the handwriting detection unit 120. In addition, the handwriting display unit 160 may display a gesture as a gesture input to the input unit 110. That is, the handwriting display unit 160 displays the gesture by the user as received by the gesture detection unit 130. Of course, the handwriting display unit 160 may receive and display such handwriting or gestures from the controller 150, or directly receive and display the handwriting sensing unit 120 or the gesture sensing unit 130. As described above, the writing display unit 160 is formed in the same area as the input unit 110.

The first display unit 170 displays text corresponding to the handwriting received from the control unit 150. That is, the text detected by the handwriting sensing unit 120 is converted into text corresponding to the control unit 150, and the converted text is displayed on the first display unit 170.

The second display unit 180 is substantially synchronized with the first display unit 170. That is, the second display unit 180 displays text having substantially the same content as the text displayed on the first display unit 170.

3A and 3B are flowcharts illustrating a handwriting input method having a document editing function according to the present invention.

As shown in FIG. 3A, the writing input method having the document editing function according to the present invention comprises the first step S1 to the sixth step S6. That is, in the writing input method having the document editing function according to the present invention, in the first step S1 of determining whether the writing detection unit detects writing through the input unit, if it is determined that the writing is detected, the writing display unit displays the writing through the writing display unit. At the same time, a second step (S2) of converting handwriting into text and displaying it on the first display unit and the second display unit, and a third step (S3) determining whether the text of the second display unit is dragged to the handwriting display unit by the drag detection unit. When the text of the second display unit is dragged onto the handwriting display unit, a fourth step S4 of enlarged display of the text dragged on the handwriting display unit and a fifth step of determining whether the gesture detection unit detects a gesture through the input unit (S5) a sixth step of performing editing corresponding to the gesture and displaying the editing result on the handwriting display unit, the first display unit and the second display unit; And a (S6).

Meanwhile, as illustrated in FIG. 3B, the first step S1 and the second step S2 may be replaced with the first step S1 ′ and the second step S2 ′, respectively. That is, the method may be replaced by a step S1 ′ of determining whether or not the already stored text is loaded instead of detecting handwriting, and a step S2 ′ of displaying the loaded text on the first display unit and the second display unit.

3A and other drawings to be described below, a writing input method having a document editing function according to the present invention will be described in detail. Of course, reference is also made to FIGS. 1 and 2. In addition, the control principal described below is the controller 150.

4A to 4C illustrate an example of a writing input method having a document editing function according to the present invention.

In a first step (S1), the writing is input through the input unit 110 to determine whether the writing detection unit 120 detects the writing. That is, as illustrated in FIG. 4A, when a user writes a predetermined writing through the input unit 110, the writing sensing unit 120 detects this. If it is determined that the writing has been detected, a second step S2 is performed.

In the second step S2, as shown in FIG. 4A, the writing is displayed as it is through the writing display unit 160 overlapping with the input unit 110 and the first display unit 170 and the second display unit ( The converted text is displayed. That is, the controller 150 converts the input handwriting into text and displays the result on the first display unit 170 and the second display unit 180. Here, reference numeral 171 of the first display unit 170 denotes a cursor. As shown in FIG. 4A, text having the same content is displayed on the first display unit 170 and the second display unit 180.

In a third step (S3), as shown in FIG. 4B, the drag detection unit 140 determines whether the text of the second display unit 180 is dragged to the handwriting display unit 160. If it is determined that the specific text of the second display unit 180 is dragged to the handwriting display unit 160, a fourth step S4 is performed. In FIG. 4B, a circular circle means that a user selects a specific text of the second display unit 180 with a finger, and an arrow connected to the round circle means that the specific text is dragged and moved to the handwriting display unit 160. .

In the fourth step S4, as shown in FIG. 4C, the dragged text is enlarged and displayed on the handwriting display unit 160. For example, the text dragged by the handwriting display unit 160 is enlarged and displayed to a size of approximately 1.5 to 7 times. If the magnification is less than 1.5 times, it may be difficult for the user to edit. If the magnification exceeds 7 times, it may be difficult to display all the dragged text on the handwriting display unit 160. In addition, as illustrated in FIG. 4C, the enlarged text may be a font having a predetermined font rather than handwriting. In addition, when the present invention is applied to a general computer instead of a mobile terminal, the text of the handwriting display unit may be enlarged approximately 1.5 to 10 times compared to the corresponding text of the first display unit and the second display unit. That is, in the case of a general computer, since the size of the monitor is relatively larger than that of the mobile terminal, there is no problem even if the size of the enlarged text is relatively larger.

In a fifth step (S5), by inputting a gesture through the input unit 110, the gesture detecting unit 130 determines whether the gesture is detected.

In a sixth step S6, the editing corresponding to the gesture is performed, and the editing result is displayed on the first display unit 170 and the second display unit 180 as well as the handwriting display unit 160.

Here, with reference to the following drawings with respect to the fifth step (S5) and the sixth step (S6) will be described.

5A to 5C illustrate another example of a writing input method having a document editing function according to the present invention.

In a fifth step (S5), as shown in FIG. 5A, an operation of dragging the text of the handwriting display unit 160 from right to left as a gesture may be sensed. In FIG. 5A, an arrow pointing to the left direction indicates a drag operation.

Then, a sixth step S6 is performed, and as shown in FIG. 5B, the text of the handwriting display unit 160 is deleted. At the same time, text having the same content is also deleted from the first display unit 170 and the second display unit 180. 5A and 5B, reference numeral 171 denotes a cursor.

In addition, in this situation, if the user writes to the input unit 110, the first step S1 and the second step S2 are performed. For example, as illustrated in FIG. 5C, when a new writing is input to the input unit 110, a first step S1 of detecting the writing by the writing detecting unit 120 is performed, and then the writing display unit 160 is input to the writing unit 160. A second step S2 of displaying the input handwriting and displaying the converted text is performed on the first display unit 170 and the second display unit 180. Therefore, delete the text of the desired part and add new text.

 6A and 6B illustrate another example of a writing input method having a document editing function according to the present invention.

In a fifth step S5, as shown in FIG. 6A, the dragging of the spaced text of the handwriting display unit 160 as a gesture may be sensed in a semicircle shape from right to left. Of course, it is assumed here that the text is already separated.

Then, a sixth step S6 is performed, and as shown in FIG. 6B, spaced texts of the handwriting display unit 160 are connected to each other and displayed. At the same time, the text spaced apart from the first display unit 170 and the second display unit 180 are connected to each other and displayed.

 7A and 7B illustrate another example of a writing input method having a document editing function according to the present invention.

In a fifth step (S5), as shown in FIG. 7A, an operation of dragging a specific single letter of the text of the handwriting display unit 160 from the top to the bottom may be sensed as a gesture.

Then, a sixth step S6 is performed, and as shown in FIG. 7B, the dragged single letter of the text of the handwriting display unit 160 is deleted and displayed. At the same time, the first display unit 170 and the second display unit 180 also display the deleted single letters.

 8A and 8B illustrate another example of a writing input method having a document editing function according to the present invention.

As shown in FIG. 8A, the user may drag the text displayed on the second display unit 180 from the right side to the left side. In the drawing, an arrow pointing to the left means a drag by the user. Then, as shown in FIG. 8B, the text corresponding to the right side of the text displayed on the handwriting display unit 160 is displayed on the handwriting display unit 160, so that the user can easily edit the text. .

 9A and 9B illustrate another example of a writing input method having a document editing function according to the present invention.

As shown in FIG. 9A, the user may drag the text displayed on the second display unit 180 from left to right. In the drawing, the arrow indicates a drag by the user. Then, as shown in FIG. 9B, the text at the position corresponding to the left side of the text displayed on the handwriting display unit 160 is displayed on the handwriting display unit 160, so that the user can easily edit the text. have.

What has been described above is only one embodiment for implementing a writing input device having a document editing function and a method thereof according to the present invention, and the present invention is not limited to the above-described embodiment, and is claimed in the following claims. As will be apparent to those skilled in the art to which the present invention pertains without departing from the gist of the present invention, the technical spirit of the present invention will be described to the extent that various modifications can be made.

1 is a schematic diagram illustrating an example of a touch panel to which a handwriting input device having a document editing function according to the present invention is applied.

2 is a block diagram showing the configuration of a handwriting input device having a document editing function according to the present invention.

3A and 3B are flowcharts illustrating a handwriting input method having a document editing function according to the present invention.

4A to 4C illustrate an example of a writing input method having a document editing function according to the present invention.

5A to 5C illustrate another example of a writing input method having a document editing function according to the present invention.

6A and 6B illustrate another example of a writing input method having a document editing function according to the present invention.

7A and 7B illustrate another example of a writing input method having a document editing function according to the present invention.

8A and 8B illustrate another example of a writing input method having a document editing function according to the present invention.

9A and 9B illustrate another example of a writing input method having a document editing function according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: touch panel

100; Handwriting input device having a document editing function according to the present invention

110; An input unit 120; Handwriting detector

130; Gesture detection unit 140; Drag detector

150; A controller 160; Handwriting

170; First display unit 180; Second display part

Claims (17)

An input unit to which handwriting by a user is input; A handwriting detector for sensing handwriting input to the input unit; A handwriting display unit which displays handwriting inputted to the input unit and is formed in the same area as the input unit; A first display unit which displays text corresponding to the handwriting detected by the handwriting detection unit; A second display unit which displays the same text as the text of the first display unit in synchronization with the first display unit; A drag detection unit to detect whether at least one text is selected from the text displayed on the second display unit and dragged to the handwriting display unit; And, A control unit which enlarges and displays the text dragged from the second display unit to the handwriting display unit and displays the edit result on the handwriting display unit, the first display unit, and the second display unit when the text of the handwriting display unit is edited by the input unit; Handwriting input device having a document editing function, characterized in that made. The method of claim 1, The handwriting display device having a document editing function, wherein the text of the handwriting display unit is enlarged and displayed 1.5 to 7 times larger than the corresponding text of the first display unit and the second display unit. The method of claim 1, And the text of the handwriting display unit is enlarged by 1.5 to 10 times compared to the corresponding text of the first display unit and the second display unit. The method of claim 1, A gesture detecting unit for detecting a gesture input to the input unit is further provided, And the controller is configured to perform editing corresponding to the gesture when the gesture is applied to the text of the handwriting display unit. The method of claim 4, wherein The gesture is an operation of dragging the dragged text from the right to the left direction or from the left to the right direction, whereby the dragged text is deleted. The method of claim 4, wherein The gesture is an operation of dragging text spaced apart from each other into a semicircle shape from right to left or from semicircle shape from left to right, whereby the spaced texts are connected to each other. Input device. The method of claim 4, wherein And the gesture is an operation of dragging a specific letter of the dragged text from the top to the bottom direction or from the bottom to the top direction, whereby the dragged letter is deleted. The method of claim 1, The control unit And dragging the text displayed on the second display unit from the right side to the left side, the text positioned on the right side of the text on the handwriting display unit is displayed on the handwriting display unit. The method of claim 1, The control unit And dragging the text displayed on the second display unit from the left side to the right side, the text located on the left side of the text on the handwriting display unit is displayed on the handwriting display unit. The method of claim 1, And a text loaded by a user on the first display unit and the second display unit. The method of claim 1, The controller may display the writing detected by the writing detection unit on the writing display unit as it is, and convert the writing detected by the writing detection unit into text and display the writing on the first display unit and the second display unit. Handwriting input device with a function. The method of claim 1, And the second display unit is formed below the first display unit, and the input unit and the handwriting display unit overlap each other under the second display unit. A first step of determining whether the writing detection unit detects writing through the input unit; If it is determined that the handwriting is detected, a second step of displaying the handwriting through the handwriting display unit and converting the handwriting into text and displaying the handwriting on the first display unit and the second display unit; Determining whether a text of the second display unit is dragged to the handwriting display unit by a drag detection unit; And, And when the text of the second display unit is dragged onto the handwriting display unit, a fourth step of enlarging and displaying the dragged text on the handwriting display unit. The method of claim 13, A fifth step of determining whether a gesture detection unit detects a gesture through the input unit; And, And a sixth step of performing an edit corresponding to the gesture and displaying an edit result on the handwriting display unit, the first display unit, and the second display unit. . The method of claim 14, The gesture of the fifth step is an operation of dragging the dragged text from right to left direction or from left to right direction, Accordingly, in the sixth step, the text input function having the document editing function of deleting the text of the handwriting display unit and the text of the first display unit and the second display unit corresponding thereto. The method of claim 14, The gesture of the fifth step is an operation of dragging the text spaced apart from each other in a semicircle shape from right to left or semicircle shape from left to right, Accordingly, in the sixth step, the text editing function may be connected to each other, wherein the texts separated from each other are connected to each other, and the first and second display parts corresponding to each other are connected to each other. Having a handwriting input method. The method of claim 14, The gesture of the fifth step is an operation of dragging a specific letter of the dragged text from top to bottom or from bottom to top, Accordingly, in the sixth step, the dragged letters of the writing display unit are deleted, and the letters of the first display unit and the second display unit are also deleted.

Images