KR101359662B1 - Digital pen system - Google Patents

Abstract

The present invention relates to a digital pen system, and the present invention has been made in view of the above problems, an object of the present invention is to form an information pattern on the surface or inside of the display device for writing using a digital pen The present invention provides a digital pen system that emits visible light and infrared rays, thereby eliminating the need for an infrared light source inside the digital pen.
According to an aspect of the present invention, there is provided a display device that physically and electrically separates an information pattern on a surface or an interior thereof, and emits visible light and infrared light to the front surface without being positionally selective; And an image sensor configured to sense an image formed by the infrared rays emitted from the display device being selectively absorbed by an information pattern formed on a surface or inside thereof. And a control unit.

Description

Digital pen system {DIGITAL PEN SYSTEM}

The present invention relates to a digital pen system. More specifically, the digital pen detects an information pattern formed on the surface or inside of the display device to determine position information according to the trace of the digital pen and to display the trace of the digital pen. To a digital pen system.

Digital pen systems generally have a display that can output images in the center, and a touch screen method that can detect the trajectory of the digital pen on the display, or a sensor that can be mounted on the outside to detect the trajectory of the digital pen. Digital pen technologies are being used.

However, in the touch screen method or the method using an external sensing sensor, as the size of the display increases, the unit price of the display increases, power consumption increases rapidly, and accuracy of digital pen trajectory recognition decreases. Accordingly, the encoding pattern including the position information of the surface is formed on the display surface so that it is difficult to judge from a human perspective, and the position of the digital pen is detected by detecting the trace pattern of the digital pen using a digital pen having an optical sensor. Techniques to make decisions are commercially available.

A digital pen using such an encoding pattern has been filed and registered in addition to Korean Patent Application No. 10-2010-7019085 (name of the invention: a method for digitally recording a digital pen and information) (hereinafter referred to as 'prior invention').

The prior art is a digital pen 20 for digitally recording information using the patterned surface 10, which captures an image of the patterned surface 10 while the digital pen 20 is in operation. One or more sensors 23 on the patterned surface 10 and one or more light sources 21 for illuminating the patterned surface 10 when the image is captured by the one or more sensors 23. An optical system comprising: an optical system that is adjustable between two or more image capture states, wherein the two or more image capture states in different geometric arrangements of the one or more sensors 23 and the one or more light sources 21. It is characterized by digitally recording the information using the patterned surface 10 on which the image is captured. Therefore, the accuracy of the handwriting is enhanced because the pattern of the digital pen 20 is tracked by recognizing the information pattern.

However, at least one light source 21 must be provided inside the digital pen, and when the surface 10 for writing using the digital pen is on a display instead of paper, the light source 21 reflected directly from the display surface is an image sensor ( 23) easily saturates or distorts the pattern image.

The present invention has been made in view of the above problems, and an object of the present invention is to form an information pattern on the surface or inside of the display device for writing using a digital pen and to emit visible light and infrared rays inside the display. It is to provide a digital pen system that does not need to have an infrared light source inside the digital pen.

According to an aspect of the present invention, there is provided a display device that physically and electrically separates an information pattern on a surface or an interior thereof, and emits visible light and infrared light to the front surface without being positionally selective; And an image sensor configured to sense an image formed by the infrared rays emitted from the display device being selectively absorbed by an information pattern formed on a surface or inside thereof. And a control unit.

delete

delete

delete

delete

According to the present invention as described above, by forming an information pattern on the surface or the inside of the display device to emit visible light and infrared light, it is not necessary to have an infrared light source inside the digital pen, it is possible to stably write on the display surface There is.

1 is a schematic diagram of a conventional digital pen system.
2 is a perspective view of a digital pen system according to an embodiment of the present invention.
3 is an explanatory diagram of an information pattern according to an embodiment of the present invention;
4 is a schematic diagram of an information pattern according to an embodiment of the present invention;
5 is a cross-sectional view of a digital pen system in accordance with an embodiment of the present invention.
6 is a cross-sectional view of a display device according to an embodiment of the present invention.

Specific features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. It is to be noted that the detailed description of known functions and constructions related to the present invention is omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

A digital pen system and a display device according to the present invention will be described with reference to FIGS. 2 to 6 as follows.

FIG. 2 is a perspective view of a digital pen system according to an embodiment of the present invention, which forms an information pattern on a surface or inside, and emits visible light and infrared light as shown in the drawing; And an image sensor 210 for detecting infrared rays emitted from the display apparatus 100 and an information pattern formed on the surface layer 110. .

As shown in FIGS. 2 and 3, the display apparatus 100 forms an information pattern in which the position information is encrypted so that the digital pen 200 can determine the position information of the surface of the display apparatus 100. The information pattern includes virtual grid lines 111 and marks 113 formed at regular intervals.

The mark 113 is for enabling the optical device to detect the location information. As shown in FIGS. 4 and 5, the mark 113 is formed at regular intervals around the intersection point of the virtual grid line 111. Each mark 113 has a mark 113 value, and the mark 113 value is at least two different numbers. In addition, the shape of the mark 113 may have various shapes such as a circle, an ellipse, a polygon, a straight line, and one type of the mark 113 may be used for one display apparatus 100. The interval between the intersection point and the mark 113 is

At this time, the value of the mark 113 is determined according to the position where the mark 113 is formed around the intersection point of the virtual grid line 111. The digital pen 200 detects the plurality of marks 113 to determine location information. Referring to FIG. 4, according to the relationship between the intersection point of the virtual grid line 111 and the mark 113, the mark 113 may exist at four positions, and the mark 113 is positioned at the right side of the intersection point as a. When the value of the mark 113 is set to "1", the value of the mark 113 is set to "2", and the value of the mark 113 is set to "3" if it is located on the left side as shown in c. If it is located at the bottom, such as d, the value of the mark 113 may be represented as "4".

In addition, the mark 113 does not always have to be formed on the virtual grid line 111 as described above, but may also be formed in a diagonal direction, and a plurality of marks 113 may be formed at the intersection of one virtual grid line 111. It may be formed to indicate a location. In addition, each mark 113 value may be divided into an x-coordinate code and a y-coordinate code and separated into x-coordinates and y-coordinates to designate a position.

The virtual grid lines 111 are invisible reference lines on the optical film and are formed horizontally and vertically at regular intervals. The distance between the grid lines 111 is preferably about 250 μm to 300 μm. Marks 113 are formed at regular intervals around the intersections of the imaginary grid lines 111, preferably 1/4 to 1/8 of the distance between the grid lines 111, and the intersections of the grid lines 111. It may be formed in four directions on the grid line 111 with respect to the center, but is not limited thereto. One mark 113 may be associated with each intersection of the grid lines 111, but the distance between the marks 113 and the intersection points of the grid lines 111 may be classified into two types, 1/4 and 1/8. It may be associated with two or more marks 113 at the intersection of the grid line 111 of.

In the digital pen 200, the location information is determined using a position where the mark 113 is formed based on the virtual grid line 111 using the plurality of marks 113. For example, when the digital pen 200 detects an encoding pattern having a size of 6 × 6, the 36 marks 113 of 6 pieces in length and width have respective mark 113 values, and each mark 113 value is used. The absolute position information can be determined by the optical device.

When the display apparatus 100 is an LCD, the display apparatus 100 includes a surface layer 110 having an information pattern formed at an upper end thereof, a liquid crystal layer 120, and a backlight unit 130 (back light unit) formed at an lower end thereof. In this case, the mark 113 may be formed on the surface of the surface layer 110 of the display apparatus 100, or may be formed inside the surface layer 110. In case of using the conventional LCD, infrared light may be uniformly emitted throughout the display apparatus 100 by replacing the backlight unit 130 with a light source that emits both visible and infrared rays, or by inserting an infrared emission light source appropriately between the visible light sources. Make sure

When the display apparatus 100 emits light directly from a display cell, such as a PDP or OLED, the phosphor or a constituent material is adjusted to generate infrared rays in the cell. In general, PDPs emit near infrared rays in the range of about 800 to 1000 nm in addition to visible light, and some PDPs use near infrared absorption filters such as phthalocyanine (I) and phthalocyanine (II) to absorb near infrared rays. In the case of PDP, the infrared absorption filter can be removed and used in a digital pen system. The OLED is composed of a plurality of organic layers between two electrodes, and may emit infrared rays by controlling organic compounds of the organic layer.

As illustrated in FIG. 3, the digital pen 200 may have a pen shape and may detect an infrared ray irradiated by the display apparatus 100 including a sensing unit to recognize an information pattern formed on a surface or inside. Various functions such as communication means, a microphone, and a speaker may be built in the digital pen 200, but when the volume of the digital pen 200 increases or the weight increases, the user's writing feeling may be impaired.

In the case of the conventional digital pen 200, since the infrared light source had to be provided inside the digital pen 200, the power consumption was excessive, the use time was short, the volume was increased, and the weight was increased, so that the grip of the digital pen 200 was not good. Made it impossible. In addition, when the existing digital pen 200 is used for the display, the light emitted from the infrared light source of the digital pen 200 is reflected from the display surface to enter the image sensor 210 due to the glass or film having high reflectance on the display surface. It was difficult for 210 to detect an image accurately due to light saturation.

Accordingly, by removing the infrared light source from the digital pen 200 and adding it to the display apparatus 100, the grip time of the digital pen 200 may be improved and the strategy consumption may be reduced to increase the use time.

Meanwhile, when using the digital pen 200 including an infrared light source, the image sensor 210 determines whether the display apparatus 100 emits a predetermined amount or more of infrared rays, thereby emitting a predetermined amount or more of the infrared rays from the display device 100. If not, the infrared light source may be operated to emit infrared light from the digital pen 200 to operate the image sensor 210, and if the display apparatus 100 emits more than a predetermined amount of infrared light, the infrared light source may not be operated.

Hereinafter will be described the operation and the effects generated in the process according to an embodiment of the present invention made of the above configuration.

First, the display apparatus 100 emits visible light and infrared rays, and when the digital pen 200 is brought into contact with the surface of the display apparatus 100 and contacts the display apparatus 100, the display apparatus 100 is controlled by an infrared light source emitted from the display apparatus 100. An image of the information pattern formed on the surface layer 110 of is continuously detected by the image sensor 210 of the digital pen.

When the user uses writing using the digital pen 200, the image sensor 210 of the digital pen 200 may calculate absolute coordinates by continuously detecting an information pattern formed on the surface or the inside of the display apparatus 100. . The coordinate value may be transmitted to a processor such as a computer or a smartphone outside the digital pen 200, and the processor may calculate the actual coordinate value at which the digital pen 200 is currently located by analyzing the coordinate value. In this case, the analysis of the information pattern can be performed in the digital pen 200 itself, or an external device can be used to reduce the volume of the digital pen.

Therefore, in the case of using the present invention, there is no need to provide an infrared light source inside the digital pen 200, thereby reducing the unit cost of the digital pen 200, reducing the volume, and increasing usable time.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be appreciated by those skilled in the art that numerous changes and modifications may be made without departing from the invention. Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

10: surface 20: digital pen
21: light source 23: sensor
100: display device 110: surface layer
111: imaginary grid 113: Mark
120: liquid crystal 130: backlight unit
200: digital pen 210: image sensor

Claims (5)

A display device which forms physically and electrically separate information patterns on the surface or inside, and emits visible light and infrared rays to the entire surface not positionally selective; And
A digital pen including an image sensor configured to sense an image formed by the infrared rays emitted from the display device being selectively absorbed by an information pattern formed on a surface or inside thereof; Digital pen system comprising a.
The method of claim 1,
The information pattern,
Forming a virtual grid line at regular intervals, at least one mark is formed around the intersection of the virtual grid line, the digital pen system having a mark value according to the position of the intersection of the mark and the virtual grid line.
The method of claim 1,
The digital pen,
Further comprising an infrared light source, the image sensor determines whether the display device emits more than a predetermined amount of infrared rays, if the predetermined amount of infrared light is not emitted from the display device by operating the infrared light source to emit infrared light from the digital pen Digital pen system, characterized in that to operate the image sensor, the display device does not operate the infrared light source if a certain amount of infrared light emitted.
delete delete

Images