JP4068386B2 - Display area identification device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The display area specifying device recognizes that the user has designated the display pattern by designating a display pattern such as an icon displayed on the screen by using a pointing device such as a pointing device. In particular, the present invention relates to a display area specifying device that recognizes a display pattern designated by a user by changing the light intensity of the display pattern with time and detecting the light intensity of the display pattern instructed by the pointing device.
[0002]
[Prior art]
Conventionally, when a user designates a display pattern such as an icon displayed on a screen using an pointing device such as a pointing device, there is a touch panel as a device that recognizes which display pattern is designated. .
[0003]
The touch panel is a display device for identifying that an icon is designated by touching an icon or the like in a specific area on the touch panel with a finger or a specific pointing device. Touch panels are widely used in station ticket machines and bank cash dispensers.
[0004]
FIG. 9 is a functional block diagram of a conventional display area specifying apparatus. As shown in FIG. 9, a touch panel is attached to an LCD (liquid crystal display).
[0005]
The LCD 20 is driven by the LCD drive circuit 40. Under the control of the LCD drive circuit 40, an address is generated by the address generation circuit 30, and a desired image is output from the image memory 10 to the LCD 20.
The touch panel 25 has two transparent resistance films stacked. When the touch panel 25 is touched with a finger or the like, the two touched portions of the resistance film overlap each other. Voltages are applied to the respective resistance films in different directions, and the voltage values detected by the respective resistance films are set to be different depending on the position where the two resistance films overlap. That is, it is possible to detect the position touched on the touch panel 25.
[0006]
[Problems to be solved by the invention]
However, in the conventional display area specifying device using the touch panel, the light transmittance of the touch panel is low, so that there is a problem that the contrast is considerably lower than that of the display area specifying device without the touch panel.
In addition, in a display area specifying device with a small screen such as a portable terminal, a high-resolution display area specifying device is often used in order to secure a display information amount. For example, when a full-dot type LCD capable of realizing high resolution is used in a display area specifying device, it may be difficult to reduce the dot interval, and there is a problem that the contrast is lowered in principle. sell. Therefore, it may not be practical to use a touch panel for a device with a small screen.
[0007]
Accordingly, the present invention has been made to solve the above-described problem, and is intended to improve the contrast of a screen without using a touch panel and to specify a display area that can detect a position designated by a pointing device. An object is to provide an apparatus.
[0008]
[Means for Solving the Problems]
  The display area specifying device of the present invention is
  The screen is divided into multiple display areas, and a unique display pattern is displayed for each display area.Display means to,
  Changing means for temporally changing the light intensity for each display area when displaying this display pattern,
  A measuring means that approaches any of the display areas and measures a temporal change in light intensity in the approached display area;
  Detection for detecting which display area of the display area the measurement means is approaching with reference to the temporal change of the light intensity of the display pattern and the temporal change of the measured light intensity Means,
  With,
The detection means outputs an image immediately before the output of the image when the measurement means measures that the light intensity measured at the time when the image is output falls below a second threshold value. The light intensity measured at the time when the image exceeds the first threshold value and the light intensity measured at the time when the image immediately after the image is output is the first threshold value. The time when the light intensity that falls below the second threshold is measured is detected.
The display area specifying device of the present invention is
A display means for dividing a screen into a plurality of display areas and displaying a unique display pattern for each display area;
Changing means for temporally changing the light intensity for each display area when displaying this display pattern,
A measuring means that approaches any of the display areas and measures a temporal change in light intensity in the approached display area;
Detection for detecting which display area of the display area the measurement means is approaching with reference to the temporal change of the light intensity of the display pattern and the temporal change of the measured light intensity Means,
Comprising
The detection means has a light intensity measured at a time when an image is output being larger than a first threshold value, and a light intensity measured at a time when the next image is output is a second value. When the light intensity measured at the time when the next image is output is smaller than the threshold value and larger than the first threshold value, the light intensity is higher than the second threshold value. It is characterized by detecting the time when it becomes smaller.
[0009]
According to the above configuration, it is possible to specify which display area the user points to with the pointing device on the screen without using the touch panel and without reducing the contrast of the screen.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a display area specifying device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a functional block diagram of a display area specifying device according to an embodiment of the present invention.
The display area specifying device according to the present embodiment includes an image memory 10, an LCD 20, an address generation circuit 30, an LCD drive circuit 40, an image switching circuit 50, a determination circuit 60, an AD conversion circuit 70, a photoelectric conversion circuit 80, and a pointing device. 90.
The image memory 10, the LCD 20, the address generation circuit 30, the LCD drive circuit 40, the image switching circuit 50, the determination circuit 60, the AD conversion circuit 70, and the photoelectric conversion circuit 80 are installed inside a casing such as a terminal.
The LCD 20 also includes a driver 21 that controls the pixels in the screen. Furthermore, the pointing device 90 includes a light receiving unit 92 that detects light and a light guide unit 91 that guides the detected light to the photoelectric conversion circuit 80.
[0011]
The LCD drive circuit 40 generates a frame synchronization signal, a line synchronization signal, and an image data transfer CLK (CLK: clock signal), and outputs the generated signals to the LCD 20. The LCD drive circuit 40 outputs a frame synchronization signal and an image data transfer CLK to the address generation circuit 30. Further, the LCD drive circuit 40 outputs a frame synchronization signal to the image switching circuit 50 and the determination circuit 60.
The image switching circuit 50 counts the frame synchronization signal, and sequentially outputs the head address of each image data to the address generation circuit 30 for each frame. The address generation circuit 30 initializes the address to the address received from the image switching circuit 50 in synchronization with the frame synchronization signal.
Further, the address generation circuit 30 generates an address in synchronization with the frame synchronization signal and the image data transfer CLK. The generated address is input to the image memory 10, and the image data stored in the area of the image memory 10 corresponding to the generated address is output to the driver 21 in the LCD 20 in synchronization with the image data transfer CLK. An image is displayed on the LCD.
Since the address is incremented in synchronization with the image data transfer CLK, a plurality of types of images stored in the image memory 10 can be sequentially displayed on the LCD 20 in synchronization with the display frame of the LCD 20. is there.
[0012]
On the other hand, the light received by the light receiving unit 92 of the pointing device 90 is input to the photoelectric conversion circuit 80 through the light guide unit 91. The photoelectric conversion circuit 80 converts the light intensity into a light intensity signal that is an analog signal, and outputs the light intensity signal to the AD conversion circuit 70.
In the AD conversion circuit 70, the light intensity signal is converted into a digital signal and input to the determination circuit 60 as a light intensity level signal. The determination circuit 60 counts frame synchronization signals in the same manner as the image switching circuit 50, and manages which image is displayed on the LCD 20 among a plurality of types of images.
That is, the determination circuit 60 recognizes which image of the images stored in the image memory 10 is displayed on the LCD 20 and when.
[0013]
The image memory 10 stores image data so that the image displayed on the LCD 20 is divided into a plurality of display areas, and the luminous intensity of the pixels constituting each display area varies with time. An icon or the like designated by the user is arranged for each of the plurality of display areas.
For example, alphabets A to Z are arranged in each display area. In this example, as an example, the image data is prepared in the image memory 10 so that 26 pieces of data from A to Z can be displayed on the LCD 20 in time series. In each image data, the light intensity is set so as to be remarkably low as compared with the other areas in any one of the display areas from A to Z.
[0014]
The user points the light receiving unit 92 of the pointing device 90 to an icon or the like in the image displayed on the LCD 20. Then, the pointing device 90 detects the light intensity of the light emitted from the icon.
[0015]
The detected light intensity is immediately processed in the photoelectric conversion circuit 80 and the AD conversion circuit 70 and input to the determination circuit 60. The determination circuit 60 compares the light intensity detected by the pointing device 90 with the frame synchronization signal from the LCD drive circuit 40.
Since each frame corresponds to an image stored in the image memory 10, the determination circuit 60 can recognize a time change in which each icon displayed on the LCD 20 shines by a frame synchronization signal. Therefore, the determination circuit 60 can identify which display area on the screen is pointed to by the user with the pointing device.
[0016]
As described above, according to the display area specifying device of the present embodiment, it is possible to specify which display area on the screen the user points to with the pointing device without using the touch panel. Become. In addition, since the touch panel is not used, the contrast of the screen is not lowered.
[0017]
Here, the pointing device 90 is connected to the photoelectric conversion circuit 80 via the light guide unit 91, but the light intensity detected by the light receiving unit 92 from the pointing device 90 to the determination circuit 60 inside the housing. May be transmitted by wireless communication such as BT (Bluetooth (registered trademark)). In this case, a transmitting device and a receiving device for performing BT communication are installed in the pointing device 90 and the housing, respectively. In addition, infrared communication may be used instead of BT.
[0018]
FIG. 2 is a diagram showing an image stored in the image memory area in the image memory shown in FIG. 1 in the display area specifying device according to the first embodiment of the present invention. FIG. 2 shows image data stored in the image memory 10 when 26 letters of the alphabet are displayed on the LCD 20.
The image memory area in the image memory 10 stores 26 types of image data corresponding to the number of letters of the alphabet. Each data is set so as to emit a different light intensity in comparison with all other display areas only in a specific display area.
[0019]
In the present embodiment, images 1 to 26 are stored, and correspond to the first to 26th frames, respectively. In each image, the light intensity of only one alphabet display area is set to be extremely weak compared to the other alphabet display areas. On the contrary, in the 26 images, the light intensity of only one alphabet display area may be set to be extremely strong as compared with the display area of other alphabets.
What is important is that the light intensity of the display area of one alphabet is extremely different from the light intensity of the display areas of the other alphabets. The degree to which the light intensity should be different depends on the sensitivity of the pointing device 90 that detects light. Therefore, the light intensity of one alphabet display region and the display regions of other alphabets are considered in consideration of this sensitivity. The light intensity is determined.
[0020]
FIG. 3 is a diagram showing a soft keyboard screen displayed on the display unit of the LCD shown in FIG.
This soft keyboard screen displays 26 alphabetic characters, and the 26 alphabetic characters are arranged in the same manner as the keyboard layout of the most commonly used keyboard.
[0021]
FIG. 4 is a display diagram in which the stored images shown in FIG. 2 are displayed on the soft keyboard screen for each frame.
[0022]
As shown in FIG. 4, images from image 1 to image 26 stored in the image memory 10 are sequentially displayed on the LCD 20. In the present embodiment, in the image 1, only the display area of the icon “Q” is set to be displayed with zero light intensity, and the other icons from A to P and R to Z are displayed on the normal LCD 20. It is set to emit light with the intensity of emitted light.
[0023]
In the next image 2, only the display area of the icon “A” is set to be displayed with zero light intensity. Here, a display area to be displayed with zero light intensity is set according to each frame in accordance with the keyboard layout of the most commonly used keyboard. The display area with zero light intensity corresponds in order from “Q” in the upper left of the leftmost column to “A” and “Z” below it, and then to the second “W” and “S” in the left column. I will do it.
[0024]
In general, since the LCD can display several tens of frames / second, the time from the first frame to the 26th frame is about 1 second.
[0025]
FIG. 5A shows the case where the pointing device shown in FIG. 1 approaches the alphabet letter A shown in FIG. 4 while all the frames are displayed (also referred to as pointing). It is a figure which shows the light intensity | strength log | history detected by the determination circuit shown.
[0026]
When the user points the alphabet letter A on the soft keyboard screen shown in FIG. 3, the light intensity obtained by the light receiving unit 92 of the pointing device 90 as shown in FIG. It becomes extremely low only at the time when the second frame is displayed on the screen, and at the time when the other frame is displayed on the screen, the light intensity by the light emission of the normal LCD 20 is obtained.
[0027]
This temporal change in light intensity varies depending on the letters of the alphabet to be pointed. For example, when the alphabet letter “Q” is pointed, the light intensity obtained by the light receiving unit 92 of the pointing device 90 is extremely low only at the time when the first frame is displayed.
[0028]
Similarly, when the letter of the alphabet to be pointed is “Z”, it corresponds to the third frame, “W” corresponds to the fourth frame, and “L” corresponds to the 26th frame. The light intensity obtained by the light receiving unit 92 of the pointing device 90 is extremely low.
[0029]
Therefore, if the user continues pointing while the display of all frames is completed, the determination circuit 60 determines that the light intensity level obtained by the light receiving unit 92 of the pointing device 90 is a predetermined threshold value (FIG. 5). It is possible to determine which key the user points to from the type of frame image displayed on the LCD 20 when the threshold value 2) shown in FIG. As described above, according to the display area specifying device of this embodiment, it is possible to determine which key the user has pointed without using the touch panel.
[0030]
In addition to the determination based on the threshold value, it is possible to make a more reliable determination by setting the determination condition together with the fact that the light intensity level has greatly changed at the previous and next frame display timings.
That is, the threshold value (threshold value 1) is set to a light intensity slightly lower than the light intensity corresponding to normal light emission. When the light intensity detected by the light receiving unit 92 of the pointing device 90 becomes smaller than the threshold value 2, at the frame display timing before and after the frame corresponding to the light intensity below the threshold value 2, the light receiving unit 92 If the detected light intensity exceeds the threshold value 1, it is determined that the frame corresponding to the light intensity below the threshold value 2 is designated by the user.
[0031]
On the other hand, the light receiving unit 92 of the pointing device 90 is slightly closer to the LCD 20 and falls below the threshold 2 except when the threshold is below the threshold 2 at a certain frame and exceeds the threshold 1 at the preceding and succeeding frames. In other words, it is assumed that the user is instructing an icon with a will. By setting two threshold values in this way, it becomes possible to more reliably identify the user's pointing.
[0032]
Further, the threshold value 1 and the threshold value 2 are set to 80% and 20% of the light intensity of the backlight of the LCD 20, for example. However, the present invention is not limited to this, and the threshold value 1 and the threshold value 2 are determined in consideration of the performance of the light receiving unit 92 of the pointing device 90, the performance of the LCD 20, or the environment in which this apparatus is used. May be.
[0033]
FIG. 5 (B) shows the case where the pointing device shown in FIG. 4 approaches the alphabet letter A shown in FIG. It is a figure which shows the light intensity | strength log | history detected by the determination circuit.
[0034]
In the example shown in FIG. 5B, the light intensity level is larger than the threshold value 1 at the first frame display timing and the third frame display timing, but at the second frame display timing. Smaller than 2 (threshold value 1> threshold value 2). As a result, it is determined that the alphabet letter A, which is displayed in black in the second frame, is pointed.
[0035]
On the other hand, the change in the light intensity level after the fourth frame display timing when the light receiving portion 92 of the pointing device 90 is separated from the LCD 20 changes beyond the threshold value 1 or the threshold value 2. In the frame, the threshold value is 2 or less, and the frame before and after the threshold value 2 frame is not changed to the threshold value 1 or more.
As described above, in such a case, even if the value falls below the threshold value 2, it is not recognized that the alphabetic character corresponding to the frame is intentionally selected by the user.
By providing hysteresis to the threshold value in this way, it is possible to detect only a sudden change in light intensity level in a short time and to identify the user's pointing more reliably.
[0036]
In addition, during the period from the first frame to the 26th frame, it is desirable that the light receiving unit 92 of the pointing device 90 is brought close to the alphabet that the user wants to select.
By the way, the shorter the display period from the first frame to the 26th frame is, the less time it takes for the user to bring the light receiving unit 92 of the pointing device 90 closer to the alphabet that the user wants to select.
Therefore, the more the number of frames that can be displayed per unit time, that is, the faster the response speed, the easier the operation is for the user. It is desirable to use an organic EL (electroluminescent panel) or the like as a display device that is easier for the user to operate.
[0037]
FIG. 6 is a diagram showing an image stored in the image memory area in the image memory shown in FIG. 1 in the display area specifying device according to the second embodiment of the present invention. FIG. 6 shows image data stored in the image memory 10 when 26 letters of the alphabet are displayed on the LCD 20, and the number of images and the number of frames are 13.
FIG. 7 is a display diagram in which each stored image shown in FIG. 6 is displayed on the soft keyboard screen for each frame.
Each image shown in FIG. 6 is the soft keyboard image of FIG. 3, where only one row or column in one row direction or column direction emits a different light intensity compared to all other display areas. Is set to
[0038]
In the present embodiment, images 1 to 13 are stored in the image memory 10 and correspond to the first to thirteenth frames, respectively. As shown in FIG. 7, the first frame includes only the light intensity of the first column of the soft keyboard image of FIG. 3, that is, the alphabet letters “Q”, “A”, and “Z”. It is set to be extremely weak compared to the display area. For example, the light intensity of “Q”, “A”, and “Z” is set to zero. In the second frame, only the light intensity in the second column of the soft keyboard image is set to be extremely weak compared to other display areas. In the 10th frame, the light intensity in the 10th column is set to be extremely weak from the 11th frame, in comparison with the other display areas, only in the light intensity of the row portion.
That is, the eleventh frame is the first column of the soft keyboard image of FIG. 3, that is, only the light intensity of alphabet letters “Q”, “W”,. Set to be extremely weak.
In this way, each image is stored in the image memory area of the image memory 10. The frames taken out from the image memory are 13 frames in one cycle. In this embodiment, all alphabetic characters are set to have extremely low light intensity twice during one cycle.
[0039]
FIG. 8 is a diagram illustrating a light intensity history detected by the determination circuit illustrated in FIG. 1 when the pointing device illustrated in FIG. 1 approaches the alphabet letter X illustrated in FIG.
When the user points the alphabet letter X on the soft keyboard screen shown in FIG. 3, the light intensity obtained by the light receiving unit 92 of the pointing device 90 as shown in FIG. And it becomes extremely low only at the time when the 13th frame is displayed on the screen, and at the time when the other frames are displayed on the screen, the light intensity by the light emission of the normal LCD 20 is obtained.
[0040]
This temporal change in light intensity varies depending on the letters of the alphabet to be pointed. For example, when the alphabet letter “Q” is pointed, the light intensity obtained by the light receiving unit 92 of the pointing device 90 is extremely low only at the time when the first frame and the eleventh frame are displayed.
[0041]
Similarly, when the letter of the alphabet to be pointed is “Z”, it is the first frame and the 13th frame, when it is “W”, it is the second frame and the 11th frame, and when it is “L”, it is the 10th frame. The light intensity obtained by the light receiving unit 92 of the pointing device 90 is extremely low only at times corresponding to the frame and the twelfth frame, respectively.
[0042]
Therefore, if the user continues pointing while the display of all frames is completed, the determination circuit 60 determines that the light intensity level obtained by the light receiving unit 92 of the pointing device 90 is a predetermined threshold value (FIG. 8). It is possible to determine which key the user points to from the type of the frame image displayed on the LCD 20 when the threshold value 2) shown in FIG.
[0043]
In addition to the determination based on the threshold value, it is possible to make a more reliable determination by setting the determination condition together with the fact that the light intensity level has greatly changed at the previous and next frame display timings. This is the same as the case where the determination is made with reference to the threshold value 1 and the threshold value 2 in the first embodiment shown with reference to FIGS. 5 (A) and 5 (B).
[0044]
As described above, in order to identify the display area pointed to by the user, when two changes in light intensity of row and column are set in one cycle, one light intensity in one cycle as in the first embodiment. The number of frames that need to be stored in the image memory 10 can be reduced as compared with the case of the change due to. In the case of the present embodiment, it is possible to identify the display area pointed to by the user with half the number of frames as compared to the first embodiment.
[0045]
If the number of frames in one cycle is small, the time for one cycle can be short. Therefore, a short period of one cycle has the same effect as an increase in the number of frames that can be displayed per unit time.
That is, as compared with the first embodiment, the display area specifying device of the present embodiment reduces the time that the user needs to keep the light receiving unit 92 of the pointing device 90 close to the alphabet that the user wants to select. Is possible. Therefore, it is easier for the user to operate.
[0046]
Further, the present embodiment is different from the first embodiment in that a display area (alphabetic characters in the example of the present embodiment) at two intersecting positions of rows and columns is specified. Therefore, if the arrangement of the display areas is different, generally the number of frames required to identify a specific display area is different.
[0047]
For example, if alphabets are arranged in 5 rows and 6 columns or 4 rows and 7 columns (which are of course the same even if the numbers of rows and columns are reversed), they are required for one cycle. The number of frames is 11 frames. This is smaller than the number of frames (13 frames) required for one period by the alphabet arrangement in the soft keyboard image shown in FIG.
[0048]
In general, since the sum of the number of rows and the number of columns is the number of frames, if the arrangement of the display areas is set so that this sum is minimized, the time for one cycle is minimized when the number of display areas is constant. . Therefore, the display area specification of the present embodiment requires less time for the user to point, and is easier for the user to use.
[0049]
A portable terminal is required to reduce the size of the terminal, but if a soft keyboard is used, many of the key devices can be omitted, and there is an effect that it is possible to contribute to size reduction.
[0050]
The present invention is not limited to the embodiment described above, and can be implemented with various modifications within the technical scope thereof.
[0051]
【The invention's effect】
According to the display area specifying device of the present invention, it becomes possible to specify which display area the user points to with the pointing device on the screen without using the touch panel, and the contrast of the screen is reduced. It becomes possible to make things disappear.
[Brief description of the drawings]
FIG. 1 is a functional block diagram of a display area specifying device according to an embodiment of the present invention.
FIG. 2 is a diagram showing an image stored in an image memory area in the image memory shown in FIG. 1 in the display area specifying device according to the first embodiment of the present invention.
3 is a diagram showing a soft keyboard screen displayed on the display unit of the LCD shown in FIG. 1. FIG.
FIG. 4 is a display diagram in which each stored image shown in FIG. 2 is displayed on the soft keyboard screen for each frame.
5A is detected by the determination circuit shown in FIG. 1 when the pointing device shown in FIG. 1 approaches the alphabet letter A shown in FIG. 4 while all frames are displayed. FIG.
(B) In the case where the pointing device shown in FIG. 1 approaches the alphabet letter A shown in FIG. 4 and the pointing device leaves immediately after falling below the threshold value 2, the determination circuit shown in FIG. The figure which shows the light intensity | strength log | history detected.
6 is a diagram showing an image stored in an image memory area in the image memory shown in FIG. 1 in the display area specifying device according to the second embodiment of the present invention. FIG.
FIG. 7 is a display diagram in which each stored image shown in FIG. 6 is displayed on the soft keyboard screen for each frame.
8 is a diagram showing a light intensity history detected by the determination circuit shown in FIG. 1 when the pointing device shown in FIG. 1 approaches the alphabet letter X shown in FIG. 7;
FIG. 9 is a functional block diagram of a conventional display area specifying device.
[Explanation of symbols]
10 Image memory
20 LCD
21 Driver
30 Address generation circuit
40 LCD drive circuit
50 Image switching circuit
60 judgment circuit
70 AD converter circuit
80 photoelectric conversion circuit
90 pointing devices
91 Light guide
92 Light receiver

Claims (6)

A display means for dividing a screen into a plurality of display areas and displaying a unique display pattern for each display area;
Changing means for temporally changing the light intensity for each display area when displaying this display pattern,
A measuring means that approaches any of the display areas and measures a temporal change in light intensity in the approached display area;
Detection for detecting which display area of the display area the measurement means is approaching with reference to the temporal change of the light intensity of the display pattern and the temporal change of the measured light intensity Means,
Equipped with,
The detection means outputs an image immediately before the image is output when the measurement means measures that the light intensity measured at the time when the image is output falls below a second threshold value. Measured at the time when the light intensity measured at the time when the image exceeds the first threshold value, which is larger than the second threshold value , and the image immediately after the image is output is output been if the light intensity exceeds the first threshold value, the display region specifying device, wherein the light intensity detecting the measured time falls below the second threshold. A display means for dividing a screen into a plurality of display areas and displaying a unique display pattern for each display area;
Changing means for temporally changing the light intensity for each display area when displaying this display pattern,
A measuring means that approaches any of the display areas and measures a temporal change in light intensity in the approached display area;
Detection for detecting which display area of the display area the measurement means is approaching with reference to the temporal change of the light intensity of the display pattern and the temporal change of the measured light intensity Means,
Equipped with,
The detecting means has a light intensity measured at a time when an image is output being larger than a first threshold value, and a light intensity measured at a time when the next image is output is the first intensity . If the light intensity measured at the time when the next image is output is larger than the first threshold, the second threshold is smaller than the second threshold, and the second threshold is smaller than the first threshold. A display area specifying device that detects a time when the light intensity becomes lower than a threshold value of 2. The changing means periodically changes the light intensity distribution for the position on the screen, changes the light intensity of each display region only once in one period, and all changes in one period. display area specifying device according the to claim 1 or claim 2, characterized in that varying the history of the temporal change in light intensity of the display area of the. The changing means periodically changes the light intensity distribution for the position on the screen, changes the light intensity of each display region only once for each row and column in one cycle, and 3. The display area specifying device according to claim 1, wherein the history of temporal changes in the light intensity of all the display areas is made different during one period. The measuring means is a pointing device, a display area specifying device according to any one of claims 1 to 4, characterized in that it comprises a light receiving means for receiving light. The display means has a screen with an organic EL ( electroluminescent panel The display area specifying device according to any one of claims 1 to 5, wherein

Images