KR100429796B1 - Display apparatus and method for providing electronic blackboard - Google Patents

Abstract

The present invention relates to a display apparatus and method, and more particularly, to a display apparatus providing an electronic blackboard function of directly generating a graphic by directly touching a CRT screen with an electronic pen equipped with an optical sensor, and superimposing the image on a current image; It is about a method. A display apparatus providing a copyboard function includes an input means for inputting a predetermined character or a figure at a predetermined position of the CRT screen being displayed, and reading the position of the input means from a signal input through the input means in a CRT display. And graphic generating means for generating a graphic signal along the trajectory of the input means and outputting the graphic signal to the CRT. According to the present invention, the CRT screen is directly touched with an electronic pen during the audio / visual education and discussion in a classroom, a conference room, and the like by drawing various figures, characters, etc. while being superimposed on an image signal on a television system to display on a screen. And intensive lectures are available.

Description

Display apparatus and method for providing an electronic blackboard function

The present invention relates to a display apparatus and method, and more particularly, to a display apparatus providing an electronic blackboard function of directly generating a graphic by directly touching a CRT screen with an electronic pen equipped with an optical sensor, and superimposing the image on a current image; It is about a method.

As televisions become larger, they are becoming more popular for audiovisual education and discussion such as lectures and presentations in lecture rooms and meeting rooms. FIG. 1 is a block diagram showing a configuration of a television system having a conventional PC monitor function. A composite video signal (CVBS) and a luminance signal tuned through a tuner 10 may be used to display a first ADC 11. Is converted into a digital signal. The color signal RGB and the vertical / horizontal synchronization signal input from the PC 12 are converted into a digital signal through the second ADC 13. The digital signals output from the first and second ADCs 11 and 13 are stored in the memory 14, and the signal processor 15 processes the digital signals stored in the memory 14 according to a display format. The digital signal processed according to the display format is converted into analog in the DAC 16 and output to the display unit 17.

When such a conventional television system is used for an audiovisual education in a lecture room, a conference room, or the like, the instructor has a problem inconvenient because a separate blackboard has to be described alternately using the television system and the blackboard.

The technical problem to be achieved by the present invention is an electronic blackboard function for effectively performing audiovisual education in a classroom or conference room by generating a graphic by directly touching the CRT screen with an electronic pen equipped with an optical sensor, and displaying the image superimposed on the current image. It is to provide a display device that provides.

Another technical problem to be solved by the present invention is an electronic blackboard for generating a graphic by directly touching a CRT screen with an electronic pen equipped with an optical sensor, and superimposing the image on the current image to effectively perform audiovisual education in a classroom or a conference room. The present invention provides a display method that provides a function.

1 is a block diagram showing the configuration of a television system having a conventional PC monitor function.

2 is a block diagram showing the configuration of a display device for providing a copyboard function according to the present invention.

3 is an external view illustrating an input unit in FIG. 2.

4 is a detailed view of FIG. 3.

5 is a detailed view of the graphic processor of FIG. 2.

6 is a flowchart illustrating an operation of a display method for providing an electronic blackboard function according to the present invention.

According to an aspect of the present invention, there is provided a display apparatus for providing an electronic blackboard function, the apparatus comprising: input means for inputting a predetermined character or figure at a predetermined position of the CRT screen being displayed; And graphic generating means for reading the position of the input means from the signal input through the input means and generating a graphic signal along the trajectory of the input means and outputting the graphic signal to the CRT.

According to another aspect of the present invention, there is provided a display method for providing a copyboard function for solving a technical problem, which includes: (a) checking the CRT screen currently being displayed, and selecting a predetermined position at a predetermined position of the CRT screen. Inputting a character or a figure; And (b) reading an input position from the input signal, generating a graphic signal according to the input trajectory, and outputting the graphic signal to the CRT.

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

FIG. 2 is a block diagram showing a configuration of a display device providing a copyboard function according to the present invention, and includes a tuner 20, a first ADC 21, a PC 22, a second ADC 23, and a memory 24. ), A signal processing unit 25, a DAC 26, a display unit 27, a signal input unit 28, a graphics processing unit 29, and a MUX 30.

3 is an external view of the signal input unit of FIG. 2, and includes a pen handle 28-1, a ball 28-2, and a button 28-3. FIG. 4 is a detailed view of FIG. 3. 28-4, the light sensing unit 28-5, the memory 28-6, the control unit 28-7, and the signal transmission unit 28-8.

FIG. 5 is a detailed view of the graphic processor of FIG. 2, and includes a sample holder (S / H) 29-1, a comparator 29-2, a controller 29-3, and a graphics engine 29-4. do.

Next, the display apparatus providing the copyboard function will be described in detail with reference to FIGS. 2 to 5.

The composite image signal CVBS and the luminance signal tuned through the tuner 20 are converted into digital signals through the first ADC 21.

The color signal RGB and the vertical / horizontal sync signal input from the PC 22 are converted into a digital signal through the second ADC 23.

The digital signals output from the first and second ADCs 21 and 23 are stored in the memory 24, and the signal processor 25 processes the digital signals stored in the memory 24 according to a display format.

The digital signal processed according to the display format is converted into analog in the DAC 26 and output to the display unit 27.

Looking at the screen output to the display unit 27, the user inputs the desired characters and figures through the signal input unit 28 in the desired position. In the present invention, the signal input unit 28 will be described with reference to the electronic pen as an example as shown in FIG. 3. The pen input 28-1 of the signal input unit 28 shown in FIG. 3 is configured to be operated by a user as if holding a general pen, and the ball 28-2 is in contact with a screen and the user operates the same. Will rotate. The button 28-3 is pressed by the user to select a desired function (color, width, brightness, etc.) when using the electronic pen.

When the user contacts the electronic pen with the display unit 27, the ball 28-2 rotates and the switching unit 28-4 operates to inform the controller 28-7 of the operation of the electronic pen.

The light detector 28-5 detects light of characters and figures input to the display unit 27 and outputs the light as an electrical signal. The light detector 28-5 includes a light receiving element such as a photodiode, and the meaning of detecting light of letters and figures is the same as detecting the position of the electronic pen.

The memory 28-6 stores an optical signal sensed by the light detector 28-5 and control data selected or selected by the user.

The control unit 28-7 performs a function consistent with the function selection signal input by the button 28-3. The user may select color, width (brightness), brightness, and the like of characters and figures input by the electronic pen, and the controller 28-7 controls color, width, brightness, and the like in response to the selection signal. In the present invention, the control unit 28-7 provided in the electronic pen does not necessarily have to be provided, and the function of the control unit 28-7 provided in the electronic pen is performed by the control unit 29-3 of the graphic processing unit 29. can do.

The signal transmitter 28-2 transmits the detected optical signal to the graphic processor 29 according to the selected control signal. In this case, the signal transmitter 28-2 may transmit an optical signal through a cable to a wired line or wirelessly transmit an optical signal through an infrared ray.

The optical signal input to the graphic processor 29 by wire or wirelessly is sampled by the S / H 29-1, held for one clock, and output.

The comparator 29-2 compares the optical signal input by the electronic pen with the one clock delayed optical signal output from the S / H 29-1, and outputs a pen position reading signal.

The image display on the CRT display unit 27 always seems to emit light due to the light emission of the phosphor and the afterimage, and the afterimage effect on the human eye, but in fact, it is scanned once every 16.7 ms (1 Field). It emits light. The light signal transmitted from the light detector 28-5 is most strongly detected when the scan line passes, and only the afterimage of the phosphor is finely detected. The comparator 29-2 senses the intensity of light and compares the horizontal / vertical synchronization signal of the currently displayed screen with the vertical position and the pixel clock of the image to determine the horizontal position and output a position determination signal. do. The position determination signal enables accurate determination of the position and movement of the electronic pen with the optical sensor on the current display unit 27.

The pen position reading signal output from the comparator 29-2 generates a graphic signal by the graphic engine 29-4 by the horizontal synchronizing signal H / vertical synchronizing signal V / clock CLK of the original screen. do. The graphics engine 29-4 generates and outputs a graphic signal along the trajectory of the pen position.

The controller 29-3 controls the graphics engine 29-4 to output the graphic on / off, width, color, etc. in a desired state by reading the touch state of the switching unit 28-4 attached to the electronic pen. Then, a reset signal for clearing a character or a figure drawn by the electronic pen is generated.

The MUX 30 is a signal overlapping unit, and superimposes the image signal currently being displayed and the graphic signal generated by the graphics engine 29-4 by using a fast blanking (F / B) signal and outputs it to the display unit 27. .

The graphic signal generated in the image signal of the display unit 27 may be stored in a memory (not shown) and connected to a printer (not shown) to print.

6 is a flowchart illustrating an operation of a display method for providing a copyboard function according to the present invention. 61) sensing the light of characters and figures input by the electronic pen and converting the light into an electrical signal (62), comparing the light signal held by the S / H with the current light signal and detecting an amount of change in light intensity (63), reading the position of the electronic pen according to the detected light intensity change amount (64), generating a graphic according to the detected position of the electronic pen (65), and superimposing the generated graphic on the original screen And display 66 of steps.

Next, a display method for providing the copyboard function will be described in detail.

The user first checks the currently displayed screen (step 60).

If the current screen is a screen desired by the user, input desired letters and figures on the screen using an electronic pen (step 61). The electronic pen is composed of a pen handle 28-1, a ball 28-2, and a button 28-3. When the electronic pen is grabbed by the pen handle 29-1 and inputs the desired characters and figures, the electronic pen 28-2 is used. Is rotated, and a signal is transmitted. The button 28-3 attached to the electronic pen inputs a control signal (color, width, brightness, etc.) selectable by the user.

Light of characters and figures input by the electronic pen is sensed, converted into electrical signals, and transmitted to the graphic processor 29 (step 62). Transmission of the signal may be transmitted by wire through a cable or wirelessly through infrared.

The amount of change in light intensity is detected by comparing the optical signal held one clock by the S / H 29-1 with the current optical signal (step 63). The image display on the CRT display unit 27 always seems to emit light due to the light emission of the phosphor and the afterimage, and the afterimage effect on the human eye, but in fact, it is scanned once every 16.7 ms (1 Field). It emits light. The light signal transmitted from the light detector 28-5 is most strongly detected when the scan line passes, and only the afterimage of the phosphor is finely detected. The comparator 29-2 detects the amount of change in light intensity in this way.

The position of the electronic pen is read based on the detected amount of light intensity change (step 64). The comparator detects the amount of change in the light intensity, compares the horizontal / vertical synchronization signal of the currently displayed screen, determines the horizontal position by comparing the vertical position and the pixel clock of the image, and outputs a position determination signal. The position determination signal enables accurate determination of the position and movement of the electronic pen with the optical sensor on the current display unit 27.

The graphic is generated according to the detected position of the electronic pen (step 65). The pen position readout signal output from the comparator 29-2 is used by the graphic engine 29-4 by the horizontal sync signal H / vertical sync signal V / clock CLK of the original screen. Generates a graphic signal according to the pen position output in the -2). That is, the graphics engine 29-4 generates and outputs a graphic arc along the trajectory of the pen position.

The generated graphic and the original screen are overlaid and displayed (step 66). The MUX 30 is a signal overlapping unit, and superimposes the image signal currently being displayed and the graphic signal generated by the graphics engine 29-4 by using a fast blanking (F / B) signal and outputs it to the display unit 27. .

The present invention is not limited to the above-described embodiments and can be modified by those skilled in the art within the spirit of the invention.

As described above, according to the present invention, a CRT screen is directly touched with an electronic pen during the audio / visual education and discussion in a classroom, a conference room, and the like, drawing various shapes, characters, etc. and being superimposed on an image signal in a television system and displayed on the screen. In this way, effective and focused lectures are possible.

Claims (14)

In a CRT display, Input means for inputting a predetermined character or figure at a predetermined position of the CRT screen being displayed; And And graphic generating means for reading the position of the input means from the signal input through the input means and generating a graphic signal along the trajectory of the input means and outputting the graphic signal to the CRT. The display apparatus according to claim 1, further comprising overlapping means for superimposing and outputting the graphic signal generated by the graphic generating means on the CRT screen being displayed. The method of claim 1, wherein the input means A switching unit for switching the presence / absence of the input means; A light detector for detecting an optical signal from the CRT to which the character or figure is input and converting the optical signal into an electrical signal; And And a control unit controlling an input color, width, brightness, and transmission of the electrical signal by the external selection signal. The display apparatus of claim 1, wherein the signal input unit is connected to the display apparatus by wire or wirelessly. The method of claim 1, wherein the input means Display device characterized in that it is formed in the shape of a pen having a ball, a handle, a button. The method of claim 1, wherein the graphic generating means A sample / holder for sampling and holding the optical signal transmitted from the input means; A position determination unit comparing the output signal of the sample / holder with the current optical signal to determine the position of the input means; And a graphic generator for generating a graphic according to the trajectory input by the input means at the determined position. The method of claim 6, wherein the position determining unit And determining the position of the input means by comparing the change in intensity of the optical signal. The display apparatus according to claim 1, wherein the graphic signal superimposed on the screen displayed on the CRT screen is connected to a printer and printable. In the CRT display method, (a) checking the CRT screen currently being displayed and inputting a predetermined character or figure at a predetermined position of the CRT screen; And (b) reading an input position from the input signal, and generating a graphic signal according to the input trajectory and outputting the graphic signal to the CRT. 10. The method of claim 9, before outputting the generated graphic signal to the CRT. and (c) superimposing the graphic signal on the CRT screen being displayed. The method of claim 9, wherein step (a) is performed by a predetermined input means. (a-1) determining, by the input unit, whether or not the user touches the CRT screen to determine whether or not the operation is performed; (a-2) detecting an optical signal from an inputted CRT and converting the optical signal into an electrical signal; And (a-3) transmitting the converted optical electrical signal by wire or wirelessly. 12. The method of claim 11, wherein in the inputting of the figure and the character of the step (a), And selecting and inputting an input color, a width, a brightness, and the optical electrical signal transmission of the input means from the outside. The method of claim 9, wherein step (b) (b-1) sample and hold the input optical signal for a predetermined clock; (b-2) comparing a current optical signal with the sampled and held optical signal to determine the position of the input graphic and character; And (b-3) generating a graphic of an input figure and a character according to the determined position. The method of claim 13, wherein in step (b-2) And comparing the intensity change of the optical signal to determine the position of the input graphic or character.