JPH0354622A - Coordinate data input device - Google Patents

Abstract

PURPOSE:To accurately obtain coordinate data for parallax correction by forming the data based on the coordinate data generated in a period other than the one immediately after a coordinate indicator tool comes in contact with a coordinate body and the one just before it is separated from the coordinate body. CONSTITUTION:In a mode to fetch the coordinate data, the coordinate data at a position indicated by a pen 10 is detected based on a signal supplied from a tablet 11 while the pen 10 comes in contact with the tablet 11. A timing is supplied to a system controller 1, and also, the coordinate data is supplied to a RAM 4 under the control of the system controller 1. Thus, the coordinate data for parallax correction is formed based on the coordinate data generated in the period other than the one immediately after the coordinate indicator tool comes in contact with the coordinate body and the one just before it is separated from the coordinate body, then, parallax correction is performed. In such a way, accurate position detection can be performed at a stable state where no shaking of the coordinate indicator tool occurs, and the coordinate data for parallax correction can be accurately obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coordinate data input device, and particularly to a coordinate data input device suitable for electronic equipment having a manual handwriting function.

[Summary of the invention]

In this invention, the coordinate data input device has a mode in which coordinate data for parallax correction is taken in to correct parallax, and in this mode, the coordinate indicating tool immediately after touching the coordinate body and when leaving the coordinate body. By forming the coordinate data for parallax correction based on the coordinate data generated in a period other than the immediately preceding period, accurate position detection can be performed under stable conditions where the coordinate indicator does not shake, and accurate parallax correction can be performed. This makes it possible to obtain coordinate data for

[Conventional technology]

Recently, electronic devices having a handwritten character input function are becoming popular. This handwritten character input and display part includes, for example, a stylus pen (hereinafter simply referred to as a pen) 3 for writing and inputting characters, as shown in FIG.
1, a transparent capacitive tablet 32 that detects the position designated by the pen 3l, and a liquid crystal display (hereinafter referred to as LCD) 33 for display.

Note that the tablet 32 and the LCD 33 are each covered with glass 34 on both upper and lower surfaces.

[Problem to be solved by the invention]

As shown in FIG. 5, when the user holds the pen 31 in an inclined state as shown in the figure and brings the tip of the pen 31 into contact with position P1 on the upper glass 34 of the tablet 32, Since parallax occurs when viewed from the user's perspective, the user expects portion P2 of the LCD 33 in FIG. 5 to be lit. However, what actually lights up is part P3, which may be out of alignment. Therefore, parallax correction is essential for electronic devices that have the above-mentioned handwritten character function. In this specification, parallax refers to the difference between the position indicated by the pen 31 as a coordinate indicating tool and the LC visually recognized by the user.
This means the difference from the display position of D33.

Since such a shift is a phenomenon that occurs almost linearly and uniformly over the whole, parallax correction is
This is performed by planar position correction as shown in Japanese Patent No. 187326.

By the way, it is necessary to import coordinate data in order to perform parallax correction, but the timing for importing this coordinate data is generally such that the target point is lit on the LCD 33 and the pen 3
When the tip of the pen 31 is brought into contact with the visible lighting position on the tablet 32 [this operation is referred to as pen down in the specification], the tip of the pen 31 is also released from the tablet 32 [
In the FiA specifications, this operation was referred to as a pen amplifier. However, when the pen is down or up, a pre-position often occurs in the pen 3l, so if the timing of position detection is set to be when the pen is down or up, accurate position detection cannot be expected. There was a problem in that it was not possible to obtain coordinate data for correction. Accordingly, an object of the present invention is to provide a coordinate data manual device that can obtain accurate coordinate data for parallax correction.

[Means to solve the problem]

The present invention is a coordinate data human-powered device that obtains coordinate data using a coordinate pointing tool, and has a mode for taking in coordinate data for parallax correction to correct parallax, and in this mode, the coordinate pointing tool The configuration is such that coordinate data for parallax correction is formed based on coordinate data generated in a period other than immediately after contacting the coordinate body and immediately before leaving the coordinate body.

[Effect]

In the mode for importing coordinate data for parallax correction, the coordinate data for parallax correction is generated based on coordinate data generated in a period other than immediately after the coordinate pointing tool contacts the coordinate body and immediately before leaving the coordinate body. This allows parallax correction to be performed. As a result, accurate position detection can be performed under stable conditions in which the coordinate pointing device does not shake, and accurate coordinate data for parallax correction can be obtained. [Embodiment] Hereinafter, an embodiment in which the present invention is applied to an electronic device having a handwritten character function will be described with reference to FIGS. 1 to 4. In the configuration shown in FIG. 1, the system controller l. In addition to controlling the entire system, it also performs various processes such as formatting and maintaining coordinate data for parallax correction, parallax correction during handwritten character input, and recognition of handwritten character input. A bidirectional bus line 2 is connected to this system controller 1. The bus line 2 includes a ROM 3, a RAM 4, a microprocessor 5 for a counter counter, an LCD controller 6,
Video RAM 7, tablet controller 8, etc. are connected. The ROM 3 stores various system programs including, for example, a parallax correction program. The ROM 3 also stores a kana-kanji conversion dictionary, handwritten input recognition + dictionary, etc. The sampled coordinate data is loaded into the RAM 4.

The microprocessor 5 counts the pulses output from the oscillation circuit, thereby not only counting time but also representing data such as time, time, date, etc. The LCD controller 6 controls the drive of the LCD 9 under the control of the system controller 1 based on various data supplied from the RAM 4, ROM 3, video RAM 7, etc. By this LCD controller 6, L
Letters, numbers, symbols, etc. are displayed on CD9.

The tablet controller 8 detects pen-down timing and pen-up timing. In addition, in the coordinate data acquisition mode, while the pen 10 is in contact with the tablet 11, the coordinate data of the position indicated by the pen 10 is acquired based on the signal supplied from the tablet l-11. is detected. The above timing is supplied to the system controller 1, and the coordinate data is supplied to the RAM 4 under the control of the system controller 1.

A switch (not shown) is provided at the tip of the pen 10, and pen-down and pen-up are detected by this switch. In other words, when pen down and pen up,
By turning the switch on and off, pen-down and pen-up signals are supplied to the tablet controller 8, and pen-down and pen-up are detected.

The tablet 11 is of a capacitive type, and the position specified by the pen 10 is detected.
Although the tablet 11 is of a capacitive type in this embodiment, the tablet 11 is not limited to this, and may be a pressure sensitive type or one that performs position detection magnetically. Although not shown,
The upper and lower surfaces of the LCD 9 and the tablet 11 are covered with glass, as in the conventional case.

The circuit operation and control operation will be explained based on the flowchart in FIG. 4.

In step 101, when a predetermined key (not shown) is operated, the power is turned on and a mode is entered for importing coordinate data for parallax correction. In this mode, the system controller
And the display on the LCD 9 is @ by the LCD controller 6.
be controlled. That is, under the control of the system controller l, the contents of the ROM 3 are read out and the contents of the LCD controller 6 are read out.
is supplied to Then, the LCD controller 6 selects [1
As shown in Figure 3, the screen of the LCD 9 that is currently being
Hold it as you would when writing, and align the tip with the center of the cross. ” is displayed 12. In step 102, pen down is detected. That is, the user points the tip of the ben 10 to the cross 13 in the display 12.
When the pen 10 is centered, a switch provided on the pen 10 is turned on and a signal indicating contact is supplied to the tablet controller 8, thereby detecting that the pen is down.
At this time, a pen down detection signal is supplied from the tablet controller 8 to the system controller 1. The system controller 1 causes the microprocessor 5 to perform a timer count of, for example, 2 seconds based on this pen down detection signal. After this, proceed to step 103. In step 103, in order not to import the coordinate data of the unstable period Td immediately after the pen down shown in FIG.
For example, it enters a standby state for 0.1 seconds.

That is, under the control of the system controller 1, the microprocessor 5 performs a timer count of 0.1 seconds. When this standby state ends, the process proceeds to step 104.

In step 104, the coordinate data obtained by the tablet l1 and the tablet controller 8 are loaded into the RAM 4 under the control of the system controller 1. After this, the process proceeds to step 105.

In step 105, pen-up is detected. That is, when the user releases the tip of Ben 10 from tablet 11, the switch provided in pen 10 is turned off, a signal indicating that Ben 10 has separated from tablet 11 is supplied to tablet controller 8, and the pen is turned off. Up is detected. At this time, a pen-up detection signal is supplied from the tablet controller 8 to the system controller 1. The system controller I terminates the timer count being performed by the microprocessor 5 based on this pen-up detection signal, and also stores the coordinate data in the RAM 4.
Stop importing to. The loading of the coordinate data into the RAM 4 starts after the end of the standby time, that is, the period Td immediately after the pen-down shown in FIG. 2, and continues until the pen-up is detected. In this case, since the RAM 4 has a limited capacity, old coordinate data that has exceeded a certain period of time is erased in order, so it is stored in a so-called ring buffer type R.
AM4, and coordinate data for a certain period of time is always held until pen-up. after that,
Proceed to step 106. Further, if pen-up is not detected, the process returns to step 104.

In step 106, of the coordinate data loaded into the RAM 4, only the coordinate data during the stable period Ts excluding the period Tu immediately before pen-up is read out. As a result, accurate position detection can be performed under a stable condition in which the Ben 10 does not shake, and accurate coordinate data for parallax correction can be obtained.

In other words, as shown in Figure 2, the point in time when the pen is down is defined as time to, and the coordinate data at the time when the pen is down is (
(
Xu, Yu).

Then, with the pen-up time t2 as a reference, a point 1 second before, for example, is time t1, and a point 0.5 seconds before, for example, is time to. 5. In this case, the period Td is the period immediately after pen-down, the period Tu is the period immediately before pen-up, and from time t1 to time to. The period up to 5 is considered to be a stable period TS in which the pen 10 is not affected by shaking when the pen is up or down. Therefore, in the system controller 1, from the time t1 held in the RAM 4 to the time tO. Based on the coordinate data of the stable period Ts up to 5, the average value is determined, and this average value forms the coordinate data for parallax correction. Then, the average value of the coordinate data is stored in the register as coordinate data for parallax correction. If the time from pen down to pen up is less than the preset time, the time from time t1 to time tO. The value of the coordinate data of the center time within the stable period Ts up to 5 may be adopted, or the user may be made to repeat the same action. The system controller 1 uses the coordinate data obtained as described above as data for parallax correction. In other words, when switching from parallax correction mode to handwritten character input mode, parallax correction is performed by adding or subtracting the coordinate data for parallax correction described above to the coordinate data detected from the tablet 11. The LCD 9 at the position is driven and lit. As a result, the parallax-corrected handwritten characters and symbols are displayed on the screen of the LCD 9, making it easier for the user to input and recognize characters. Note that the method of obtaining coordinate data is not limited to the above-mentioned example; for example, coordinate data of an appropriate time within the stable period Ts may be adopted, or coordinate data of an appropriate time within the stable period Ts may be adopted. Decisions may be made by majority vote. Further, in this embodiment, the combination of the tablet 11 and the LCD 9 is described, but the present invention is not limited to this, and for example, the combination with a CRT can be similarly applied. Also, in this example,
Although this article describes an electronic device with an integrated handwritten character input function, it is not limited to this, and can be applied to all non-integrated pointing devices. Since the tablet 11 LCD 9 has a laminated structure with glass interposed in between, misalignment may occur between the coordinates of both tablets 11 and LCD 9 due to misalignment when the tablet 11 and LCD 9 are attached. However, according to the present invention, highly accurate position detection is possible without deteriorating the accuracy of position detection. In other words, the coordinate data on the LCDQ is
Since each corresponds to the coordinate data of the tablet 11 with a deviation, this deviation can be used as the correction amount for parallax correction. Therefore, LCD9 and tablet1
Even if there is a misalignment when fitting the parts together, the misalignment can be absorbed and highly accurate position detection can be performed. [Effects of the Invention] According to the coordinate data input device according to the present invention, in the mode of importing coordinate data for parallax correction, the coordinate indicating tool is operated during a period other than immediately after contacting the coordinate body and immediately before leaving the coordinate body. Since the coordinate data for parallax correction is generated based on the coordinate data generated in This has the effect of making it possible to perform accurate parallax correction. Further, even if the tablet and the LCD are glued together in a misaligned state, the accuracy of position detection is not impaired, and highly accurate position detection is possible, and there is an effect that the misalignment between the tablet and the LCD can be absorbed.

[Brief explanation of drawings]

Figure 1 is a block diagram of an embodiment of the present invention, Figure 2 is a diagram explaining the period during which coordinate data is captured, Figure 3 is a diagram of the LCD screen in parallax correction mode, and Figure 4 is a diagram of the LCD screen in parallax correction mode. Flowchart explaining import of coordinate data, No. 5
The figure is a diagram for explaining the conventional technology. Explanation of main symbols in the drawings 10, 31: Stylus Ben, 11, 32: Tablet, Td, Tu: Period, TS: Stable period.

Claims (1)

[Scope of Claims] A coordinate data input device that obtains coordinate data using a coordinate indicating device, the device having a mode for capturing coordinate data for parallax correction for correcting parallax, and in the above mode, the above coordinate indicating device is provided. A coordinate data input device characterized in that coordinate data for parallax correction is formed based on coordinate data generated in a period other than immediately after a tool contacts a coordinate body and immediately before it leaves the coordinate body.