JPS6292021A - Coordinate input device - Google Patents

Abstract

PURPOSE:To omit a tablet and to simplify both the constitution and control of a coordinate input device by applying successively the white/black inversion to the prescribed coordinates on a liquid crystal display screen. CONSTITUTION:A reflecting plate 2 of a liquid crystal display screen 1 is irradiated by a light emitting element 4 of an input pen 3. While a photodetecting element 6 of the pen 3 receives the light reflected from the element 4. The white/black inversion is applied successively to the prescribed coordinates on the screen 1 through a drive part 8 by the pen 3 with use of the synchronizing signal of a control part 18. The signals produced from said inversion are synchronized with the part 8 and the output change of the pen 3 is detected by a detecting port 9. In such a way, the coordinate can be detected.

Description

[Detailed Description of the Invention] [1 Required] The input pen is provided with a light-emitting element and a light-receiving element that output a signal by reflection from a reflective plate of a liquid crystal display screen, and the predetermined coordinates of the liquid crystal display screen are sequentially inverted in black and white. By doing so, the detection port is configured to detect the coordinates of the input pen that is in contact with a predetermined location on the liquid crystal display screen.

[Industrial application field]

The present invention relates to a coordinate input device for an input pen used in a display device having a liquid crystal display screen, and in particular, the input pen is provided with a light emitting element and a light receiving element for illuminating the reflection plate of the liquid crystal display image 1. The present invention relates to a coordinate input device configured to detect the coordinates of an input pen by sequentially inverting predetermined coordinates on the liquid crystal display screen.

Some display devices equipped with a liquid crystal display screen are configured so that predetermined data can be input and output by specifying an input pen for an image displayed on the display screen.

Such a display device is configured such that -1'3Q coordinates of the display screen specified by an input pen are detected, and data to be input is selected by detecting the coordinates.

Therefore, if such coordinates are detected incorrectly, incorrect data will be input, so it is necessary to accurately detect the specified coordinates, and furthermore, it is necessary to have a simple and inexpensive configuration. Something is desired.

[Conventional technology]

Conventionally, the configuration was as shown in the conventional flowchart of FIG.

As shown in FIG. 5, a tablet 1 is displayed on the liquid crystal display screen 1.
1 is superimposed and the display data sent from the host CPU 6 is controlled by the control unit 13. The data is stored in the storage unit 12 by IO, and the drive unit 17 is configured to display the display data on the liquid crystal display screen using the display data stored in the storage unit 12.

The input pen 10 also includes an oscillator 1 that outputs a predetermined signal.
5 is provided, and the tablet 11 is provided with a detection section 14 that detects the signal.

Therefore, when a predetermined position of the image displayed on the liquid crystal display screen 1 is specified by the input pen 10, the coordinates of the output signal of the input pen 10 are detected by the detection unit 14 via the tablet 11, and the coordinates are detected. The coordinates are
The PU 16 is notified and the display data instructed by the input pen 10 is verified.

Therefore, by bringing the input pen 10 into contact with the image displayed on the liquid crystal display screen 1, predetermined data can be selectively input from the displayed data.

Furthermore, some tablets 11 are configured to use lines of magnetic force and detect coordinates based on changes in the magnetic force when the input pen 10 is brought close to the tablet 11 .

[Problem that the invention seeks to solve]

However, the coordinates 41tl by such a tablet 11
In any case, coordinates may be erroneously detected due to noise from the outside, and in this case there is a problem in which erroneous data is input.

In addition, providing such a tablet 11,
Since it has to be formed so as to overlap the liquid crystal display screen l, the structure of the display screen becomes complicated and it becomes expensive.

[Failure to solve the problem]

FIG. 1 is a diagram explaining the principle of the present invention.

As shown in FIG.
a light emitting element (4) that emits light, and a light receiving element (6) that receives reflected light from the reflector plate (2) via a second optical mechanism (7).
), and a drive unit (8) that sequentially inverts predetermined coordinates of the liquid crystal display screen (1) into black and white;
) Detection port (9) that detects and notifies the located coordinates of
, the black and white inversion drive of the drive unit (8) and the detection port (9).
) is provided with a control unit (8) for controlling the detection to be synchronized with the detection.

With this configuration, the above-mentioned problems are solved.

[For production]

That is, by using an input pen that illuminates the reflection plate of the liquid crystal display screen with a light emitting element and receives the reflected light with a light receiving element, the predetermined coordinates of the liquid crystal display screen are sequentially inverted in black and white, and the detection signal from the inversion is used to detect the input pen. The designated coordinates are detected.

Therefore, there is an advantage that a conventional tablet is not required, the structure is simplified, and false detections due to noise etc. are eliminated.

〔Example〕

The present invention will be explained in detail below with reference to FIGS. 2, 3, and 4. FIG. 2 is a block diagram of an embodiment of the present invention, FIGS. 3(a), 3(b), and 3(c) are explanatory diagrams of the input pen of the present invention, and FIG. 4 is a flowchart of the present invention. The same reference numerals indicate the same objects throughout the figures.

As shown in FIG. 2, the drive section 8 inverts the liquid crystal display screen 1 in black and white in a predetermined order under the control of the control section 18, and sends a signal for black and white inversion in synchronization with the drive section 8 under the control of the control section 18. is detected via the input pen 3, and the coordinates where the input pen 3 is located are sent to the host CPU.
16 is provided, and the other configurations are the same as those described above.

Further, the input pen 3 needs to be configured as shown in FIGS. 3(a), 3(b), and 3(c).

(As shown in FIG. 3(a), the irradiated light from the light emitting element 4 is converged through the lens of the first optical mechanism 5 to a point P protruding from the tip 3A, and the light reflected at the point P is The light is configured to be received by the light receiving element 6 via the lens of the second optical mechanism 7.

Therefore, as shown in (b), by bringing the input pen 3 into contact with the liquid crystal display screen 1, the light emitted from the light emitting element via the first optical mechanism ↓ 5 passes through the deflection plate IC and the glass IB. , the light is rotated by the liquid crystal IE, and further the glass I
The light passes through A and the deflection plate ID and is converged on the reflection plate 2. This converged light is reflected by the reflection plate 2 and reaches the light receiving element 6 via the second optical mechanism 7 along a path opposite to that described above.

In this case, if a voltage is applied to the liquid crystal IE, no optical rotation will occur due to the liquid crystal I, so the light emitted from the light emitting element 4 will be absorbed due to the difference in the polarization axes between the deflection plates IC and ID.
The light does not reach the light receiving element 6.

Furthermore, as shown in (c), the optical axis of the reflected light is g' relative to the optical axis g of the irradiated light in the light reflected by the polarizing plate 1c,
Since the axis of the light reflected by the reflection plate 2 is different from that of the light, it almost never reaches the light receiving element 6.

Therefore, the output signal is obtained by the light receiving element 6 only when no voltage is applied to the liquid crystal IE, and no output signal is obtained when the voltage is applied, so the display state of the liquid crystal display screen 1 is detected by the input pen. be able to.

With this configuration, coordinates can be detected by the operation shown in the flowchart of FIG.

The part (X
, Y) in order from the edge of the liquid crystal display screen 1, scan the entire display screen and read the coordinates. At this time, invert the black and white of the coordinates (X, Y) of the part to be detected, Synchronizing with that, there is a change in the input of the detection port 90, and when the black and white of that coordinate is restored to its original state, synchronized with that, and the input of the detection port is restored to its original state, enter that coordinate with the pen 3. The coordinates can be detected by determining that they are the indicated coordinates.

The above is an embodiment of the coordinate input device according to the present invention.
It is not necessary to perform black-and-white reversal of the display for the entire screen (it can also be performed only for predetermined coordinates to be detected; in this case, there is an advantage that the detection time can be shortened).

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to detect coordinates by inverting the displayed dots on the liquid crystal display screen and detecting the change in the output of the input pen at that time. becomes unnecessary.

Therefore, the configuration and control can be simplified, costs can be reduced, and compared to conventional tufflets,
Erroneous detection due to noise etc. is eliminated, reliability is improved, and the practical effect is on people.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention. FIG. 2 is a block diagram of an embodiment according to the present invention. FIGS. 3(a), 3(b), and 3(c) are explanatory diagrams of the input pen of the present invention. FIG. 4 is a flow chart diagram of the present invention. FIG. 5 shows a conventional block diagram. In the figure, 1 is a liquid crystal display screen, and 2 is a reflector. 3 is an input pen, 4 is a light emitting element. 5 is a first optical mechanism; 6 is a light receiving element. 7 is a second optical mechanism, and 8 is a drive unit. 9 is a detection port, and 18 is a control unit. 7 Kuihe Tsuboto Masuji Soup TIT shell-t-::'-,;,7
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Claims (1)

[Claims] A liquid crystal display screen (1) on which predetermined display data is displayed; and an input pen (3) that inputs the coordinates of the contact point by touching a predetermined point on the liquid crystal display screen (1). ), the input pen (3) includes a light emitting element ( 4), and a light-receiving element (6) that receives the light reflected by the reflection plate (2) via a second optical mechanism (7), and the predetermined coordinates of the liquid crystal display screen (1) are sequentially displayed in black and white. A drive unit (8) for inverting, a detection port (9) for detecting and notifying coordinates based on the output signal of the light receiving element (6) resulting from the black and white inversion, and a detection port (9) for driving and notifying the black and white inversion of the drive unit (8). 9) A coordinate input device characterized by comprising a control unit (18) that controls the detection in synchronization with the detection of the coordinate input device (18).