JPH04355815A - Touch screen - Google Patents

Abstract

PURPOSE:To avoid erroneous input and to input multilevel information by detecting coordinates with plural coordinate detection screen layers and correcting erroneous input due to parallax and invalidating coordinate input in areas other than a designated area. CONSTITUTION:In a multilayered coordinate detection screen 1 arranged on a display device, the coordinates of a designating point on the display device are corrected based on the coordinates of first and second layers taken in correspondingly to the interception of both layers. When the coordinates of both layers taken in correspondingly to the interception of 1st and 2nd layers are different, this coordinate input is invalidated, and an operator is prompted to perform both inputs. Information of layers fetched correspondingly to the interception of 1st, 2nd,...n-th layers are obtained as multilevel information. Consequently, coordinates are detected by plural coordinate detection screen layers, and erroneous input due to parallax is corrected, and the coordinate input in areas other than the designated area is invalidated to avoid the erroneous input, and multilevel information can be inputted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch screen that detects coordinates by disposing a coordinate detection screen on a display device.

0002

2. Description of the Related Art Optical touch screens incorporated in the front of CRTs and liquid crystal panels are non-contact, do not reduce screen transmittance, and have good operability because they have little effect on the display screen. This optical touch screen is composed of a light emitting element such as an infrared light emitting element and a light receiving element, and the coordinate detection surface needs to be flat.

Conventionally, when a touch screen is retrofitted to a CRT or the like, it is often impossible to install the curved CRT tube surface and the coordinate detection surface sufficiently close to each other. I tried to touch it with my finger from the front to avoid parallax.

0004

However, as shown in FIG. 5, there is a problem in that when touching with a finger obliquely from the surface of the CRT tube, erroneous input of coordinates occurs due to parallax. Hereinafter, the erroneous input of coordinates due to parallax in FIG. 5 will be briefly explained. In FIG. 5, a CRT tube surface 21 is a fluorescent screen of a CRT on which a screen is displayed.

[0005] The coordinate detection element 22 is one coordinate detection element (coordinate detection element consisting of a set of a light emitting element and a light receiving element) constituting an optical touch screen. CRT tube surface 2
A touch screen having a large number of coordinate detection elements 22 is disposed on the touch screen 1, and when the user presses a target pointing point P on the curved CRT tube surface 21 with a finger from the touch screen as shown in the figure, the CRT tube surface The coordinates of the position of the black circle are detected on the flat touch screen placed on 21. Therefore, in reality, a position shifted by the y coordinate position in the figure is detected in response to the parallax, which results in an erroneous input.

[0006] The present invention aims at correcting/avoiding erroneous input due to parallax and inputting multivalued information by performing coordinate detection in a plurality of layers.

[0007]

[Means for Solving the Problems] Means for solving the problems will be explained with reference to FIG. In FIG. 1, a coordinate detection screen 1 is a screen placed on a display device, and detects a coordinate position blocked by a user.

[0008]

[Operation] As shown in FIG. 1, the present invention detects the captured coordinates of both layers in response to the interruption of the first layer and the second layer on a multi-layer coordinate detection screen 1 arranged on a display device. The coordinates are corrected to the coordinates of the indicated point on the display device. In addition, in response to the blocking of the first and second layers,
When the imported coordinates of both layers are different, the coordinate input is invalidated and re-input is prompted. In addition, in response to the interruption of the first layer, second layer, .

[0009] Therefore, it is possible to perform coordinate detection using multiple coordinate detection screen layers to correct erroneous inputs due to parallax, to avoid erroneous inputs by invalidating coordinate inputs outside the specified area, and to input multivalued information. becomes possible.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure and operation of an embodiment of the present invention will be explained in detail using FIGS. 1 to 4. In FIG. 1, the coordinate detection screen 1 is a screen placed on a display device (not shown), and has a first layer sensor surface, a second layer sensor surface, and so on, and includes a light emitting element 11 that emits infrared rays and an infrared ray The light-receiving elements 12 for detecting that the light is blocked are arranged in a matrix.

The light emitting element 11 is an element such as a light emitting diode that emits infrared light. The light-receiving element 12 is a device (for example, a phototransistor) that receives and detects infrared rays emitted from the light-emitting element 11 and detects a position where the infrared rays are blocked by a user's finger or the like. These light emitting elements 11
About 100 pairs of light receiving elements 12 are arranged in the X direction and the Y direction.

The LED drive circuit 2 sequentially supplies current to the light emitting elements 11 in synchronization with a scan signal to cause them to emit infrared rays. The PTr receive circuit 3 extracts scan data from the signal received by the light receiving element (phototransistor) 12 based on the scan signal from the scan control circuit 4.

The scan control circuit 4 generates a scan signal according to each operation mode (see modes 1, 2, and 3 in FIG. 3) in response to instructions from the operation mode control section 5,
The detection signal from the PTr receive circuit 3 and the scan signal are compared and converted into coordinate data. The operation mode control unit 5 controls operation modes (modes 1 and 2 in FIG. 3).
, 3).

The processing device interface 6 is an interface for exchanging scan commands and detected coordinate data. Next, the operation of the configuration shown in FIG. 1 will be explained in detail using FIGS. 2A, 2B, and 2C. FIG. 2A shows an example in which a two-layer coordinate detection screen 1 is arranged on a curved display device 7 to correct parallax.

In (a) of FIG. 2, the user blocks the two-layer coordinate detection screen 1 from the upper right to the lower left in the figure with his or her fingertip toward the pointing point P on the curved display device 7. , when the coordinates are detected by the black circle coordinate detection element, the formula (y direction) in which the coordinates of the indicated point P are written on the right side from these two coordinates, y=(h1/h2)×dy...・・・・・・
...... Correct according to (1).

Here, h1 represents the distance between the coordinate detection element of the first layer in the interlayer direction and the display device 7, and h2 represents the distance between the coordinate detection element of the first layer and the coordinate detection element of the second layer in the interlayer direction. dy represents the distance between the first layer coordinate detection element and the second layer coordinate detection element in the y direction. Similarly, the formula in which the coordinates of the indicated point P are written on the right side (x direction),
x=(j1/j2)×dx・・・・・・・・・・・・
...... Correct according to (2).

Here, j1 represents the distance between the coordinate detection element of the first layer in the interlayer direction and the display device 7, and j2 represents the distance between the coordinate detection element of the first layer and the coordinate detection element of the second layer in the interlayer direction. dx represents the distance between the first layer coordinate detection element and the second layer coordinate detection element in the x direction. Through the above processing, the operation mode control section 5 of FIG.
The coordinates detected by the layer coordinate detection element and the second layer coordinate detection element are taken in, and based on these, equation (1),
(2) makes it possible to obtain correct coordinates on the display device 7 with parallax corrected.

It should be noted that the user points 2 points in the direction from the upper right to the lower left in the figure with his or her fingertip toward the pointing point P on the curved display device 7.
The coordinate detection screen 1 consisting of layers is blocked, and the coordinates are detected by the coordinate detection elements of black circles. If these values are different, the coordinates input at this time are invalidated. It then prompts you to re-enter. This invalidates the coordinate values when they protrude from, for example, a rectangular area on the display device 7,
You can avoid mistakes when inputting coordinates.

FIG. 2B shows an example in which two layers of the coordinate detection screen 1 are arranged on the display device 7, and each layer is given different information. In (Ro-1) of Fig. 2, the light shielding object (finger) is
This shows how the coordinate detection elements are inserted between the layers to perform detection. When detected in this first layer, the coordinates are captured here. (Ro-2) in FIG. 2 shows how the light shielding object (finger) is further pressed down and inserted between the coordinate detection elements of the second layer to perform detection. When detected in this second layer, the switch is turned on.

Through the above processing, coordinates are detected on the first layer of the two-layer coordinate detection screen 1 arranged on the display device 7, and a switch is turned on/off on the second layer, for example, when the mouse is clicked. After dragging (moving) the switch to the target position, it is possible to turn off the switch. FIG. 2C shows an example in which a multilayer coordinate detection screen 1 is arranged on the display device 7, and each layer is given quantity information.

(H-1) in FIG. 2 shows that the light shielding object (finger) is
An example will be shown in which the layer information is inserted between the coordinate detection elements of the second layer, the third layer, . (C-2) in FIG. 2 displays a rectangular VOL area on the display device (CRT) 7, and
An example is shown in which the volume is adjusted by inserting a finger between the coordinate detection elements in the OL area as shown in (c-1) of FIG.

Through the above processing, it becomes possible to adjust the volume and the like by associating the amounts with the layers of the multilayer coordinate detection screen 1 on the display device 7. Next, the operation of the configuration of the embodiment of the present invention will be described in detail in accordance with the order shown in the flowchart of FIG. Here, Mode 1: A mode in which diagonal input due to parallax or the like is permitted and input coordinate values are corrected, and it is possible to capture correct coordinates in which errors due to parallax due to curvature of the display device 6 are automatically corrected.

Mode 2: This is a mode in which when the two-layer coordinate detection screen detects different coordinate values (if there is a parallax), the input coordinate values are invalidated and prompting for re-input. It becomes possible to invalidate coordinate values that protrude from the area and prevent erroneous input. Mode 3: A mode in which the multilayer coordinate detection screen is treated as an independent sensor, such as mouse button operation (
(click and drag, etc.) and electronic volume.

In FIG. 3, S1 starts inputting coordinates using the coordinate detection screen 1 of FIG. S2 determines the mode. This determines which of the above-mentioned mode 1, mode 2, and mode 3 is set. Corresponding to mode 1, mode 2, mode 3, S3 to S5, S
11 to S15 or S21 to S25.

In the case of mode 1: First layer data is loaded in S3, second layer data is loaded in S4, and coordinates are corrected based on the two sets of data in S5. The correction of the coordinates is performed by substituting j1, j2, dx, h1, h2, and dy into the following equations x=(j1/j2)×dx y=(h1/h2)×dy described above. These corrected (x, y) are used as coordinate input values and are notified to a processing device or the like.

[0026] In the case of mode 2: The first layer data is imported in S11, the second layer data is imported in S12, and it is determined in S13 whether the data in the first layer and the second layer are the same, and YES (same).
If so, the coordinate input is validated and data processing is performed in S14, and if NO (different), the coordinate input is invalidated and re-input is prompted in S15, and the steps from S1 onwards are repeated. Through the above processing, the coordinate input of a rectangular area on the display device 7, for example, can be input by inputting the coordinates only when the data in the first layer and the second layer are the same, and by prompting the input again as invalid when they are different. You can prevent erroneous input by importing only

[0027] In the case of mode 3: the first layer data is fetched in S21, the first data is processed in S22, it is determined whether or not there is second layer data in S23, and YES (second layer data is present). When , the second layer data is imported in S24,
In S25, the second layer data is processed, and on the other hand, if NO (the second
(no layer data), do nothing. As a result, you can perform mouse clicks (using the first layer data) and dragging (using the second layer data) as shown in FIG. 1st layer data, 2nd layer data
It becomes possible to use the layer data, the third layer data, and the nth layer data for the volume.

FIG. 4 shows an external view of an embodiment of the present invention. This shows an example in which the first and second layer coordinate detection screens 1 are arranged on a TV monitor using a CRT, which is a display device 7. By placing the flat coordinate detection screen 1 on the surface of the curved display device 7 and performing the processing corresponding to the mode 1, mode 2, or mode 3 described above, corrected and accurate coordinate values can be captured. display device 7
It is possible to invalidate coordinate inputs protruding from the upper rectangular area, or to block the rectangular area (electronic volume, VOL) on the display device 7 with a finger to directly operate the volume.

[0029]

[Effects of the Invention] As explained above, according to the present invention,
Because the system uses a configuration in which coordinate detection is performed using multiple coordinate detection screen layers, the curved CRT screen of a CRT device and the touch screen cannot be made parallel to each other, creating a gap between the two, resulting in errors due to parallax. The system can also correct erroneous inputs due to the parallax, invalidate coordinate inputs outside the specified area to avoid erroneous inputs, and input multivalued information.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of the operation of the present invention.

FIG. 3 is a flowchart explaining the operation of the present invention.

FIG. 4 is an external view of an embodiment of the present invention.

FIG. 5 is an explanatory diagram of the prior art.

[Explanation of symbols]

1: Coordinate detection screen 11: Light emitting element 12: Light receiving element 2: LED drive circuit 3: PTr receive circuit 4: Scan control circuit 5: Operation mode control section 6: Processing device interface 7: Display device

Claims (3)

[Claims] Claim 1: A touch screen that detects coordinates by placing a coordinate detection screen on a display device, the touch screen having a plurality of layers of coordinate detection screens (1) arranged on the display device,
In response to the interruption of the first and second layers of the multi-layered coordinate detection screen (1), these coordinates are captured and corrected to the coordinates of the indicated point on the display device based on the coordinates of both layers. A touch screen characterized by the following configuration. 2. A touch screen that detects coordinates by arranging a coordinate detection screen on a display device, wherein a plurality of layers of coordinate detection screens (1) are arranged on the display device,
These coordinates are captured in response to the interruption of the first and second layers of the multi-layered coordinate detection screen (1), and when the coordinates of both layers are different, the coordinate input is invalidated and prompts for re-input. A touch screen characterized by being configured as follows. 3. A touch screen that detects coordinates by arranging a coordinate detection screen on a display device, wherein a plurality of layers of coordinate detection screens (1) are arranged on the display device,
The coordinates of the first layer, second layer, etc. of these multiple layers of coordinate detection screen (1) are captured in response to the interruption of the nth layer, and the layer information is configured to be multi-valued information. Features a touch screen.