KR20000050744A - Pen contact detection apparatus and method - Google Patents

Abstract

PURPOSE: An apparatus for detecting a pen input and a method for the same are provided to reduce a load of a system and display a line at dragging, by determining a pointing mode and a dragging mode at touch of the pen, and detecting a pen input value for each shaft direction by predetermined numbers continuously. CONSTITUTION: An analog/digital converter(220) detects a voltage according to a pen contact onto a touch panel(210), and converts it to digital data at a working mode. A touch control block(230) recognizes an occurrence of an interrupt when a tip is contacted to the touch panel(210), and supplies a voltage to the touch panel(210). The touch control block(230) calculates the digital data from the analog/digital converter(220) to determine a pointing mode and a dragging mode, and outputs the digital data of the analog/digital converter(220) after one of the pointing mode and the dragging mode is determined. A CPU(240) calculates the data stored in the touch control block(230) and then displays a dot and a line on an LCD(250) when an interrupt request signal is generated in the touch control block(230).

Description

Pen input sensing device and method {PEN CONTACT DETECTION APPARATUS AND METHOD}

The present invention relates to an information terminal, and more particularly, to an apparatus and method for detecting a pen input in an information terminal using a pen input device.

In general, as shown in the state transition diagrams of FIGS. 1 and 2, the pen input device generates a tip down interrupt when the tip contacts the touch panel in the Idle mode, transitions to the working mode, and an effective interrupt occurs. If the tip-down interrupt occurs after the transition to the contact mode, there are two types of transitions to the working mode.

As shown in the circuit diagram of FIG. 3, the conventional pen input device includes a touch panel 110 that senses contact of a tip, and an interrupt generator 120 that generates an interrupt when the tip contacts the touch panel 110. And switching control logic 130 for sequentially supplying voltages X + and X− (Y + and Y−) to the touch panel 110 after an interrupt is generated, and as the tip contacts the touch panel 110. An analog / digital converter 140 that senses a voltage and converts it into digital data, and when an interrupt occurs from the FET 120, the switching control logic 130 is controlled to supply voltages X + and X to the touch panel 110. It is composed of the CAPI 160 to supply () + (Y +, Y-) and to analyze the output of the analog-to-digital converter 140 to display on the LCD (150).

The interrupt generator 120 is composed of a FET.

Referring to the operation of the prior art as follows.

When the tip contacts the touch panel 110 in the Idle mode, a current path is formed from the resistor R3 to the ground (Y-) side to generate an interrupt (INT) in the interrupt generator 120, and the CPI 160 is connected to the tip panel. The switching control logic 130 is controlled by switching to the working mode by judging it as a touch input by the interrupt INT and applying the voltages X +, X- (Y +, Y-) to the touch panel 110. It will be supplied sequentially.

In this case, when the switching control logic 130 turns off the FET constituting the interrupt generator 120 and applies voltages X + and X− to the X-axis of the touch panel 110, the analog-to-digital converter 140 The voltage applied to 'Pa (X)' through the channel ch1 is detected and converted into digital data Pd (X) and stored.

Thereafter, when the switching control logic 130 applies voltages Y + and Y− to the Y-axis of the touch panel 110, the analog-to-digital converter 140 is connected to 'Pa (Y)' through the channel ch2. The applied voltage is sensed and converted into digital data Pd (Y) and stored.

Accordingly, when data Pd (X) and Pd (Y) for one coordinate point are formed, the CPI 160 processes them and displays them on the CD 150.

On the other hand, as shown in Fig. 12 (a) (b) is performed in the same process as the flow chart of Figure 4, for example, the case of performing the above operation three times during one scan, it will be described as follows.

That is, when the CAPI 160 detects the interrupt signal INT, the switching control logic 130 applies a voltage to the X axis of the touch panel 110 and operates the analog / digital converter 140 to digitize the X value ( After storing Pd (X), the voltage is applied to the Y-axis by the switching control logic 130 to operate the analog / digital converter 140 to store the digitized Y value Pd (Y).

At the same time, the CSI 160 repeatedly checks the interrupt signal INT and maintains the working mode if it is active.

Therefore, if the above operation is performed three times, the CPI 160 calculates the detection values Pd (x0, y0), Pd (x1, y1), and Pd (x2, y2) to contact the pen position P1 (x , y)) is displayed and the position is displayed on the CD 150.

However, the conventional technique of distinguishing the idle mode from the working mode or the contact mode reflecting the tip down, as shown in the state transition diagrams of FIGS. 1 and 2, has no problem when the pen input is used as a simple pointing device. In this case, the dragging mode required by the information terminal using the pen input device is not distinguished, and thus the line cannot be smoothed because the correct pen input cannot be processed during dragging.

That is, in the related art, since a pen input value is processed by software, a time gap occurs to process three data in one scan time due to the switching stabilization time of the switching control logic 130 and the conversion time of the analog / digital converter 140. This is a drawback of causing a smooth line in the dragging mode.

Accordingly, the present invention eliminates the load of the system by determining the pointing mode or dragging mode at the time of pen touch and continuously detecting and processing the pen input value a predetermined number of times in each axial direction in order to improve the conventional problem. It is an object of the present invention to provide a pen input sensing device and method invented to smoothly display a line.

1 and 2 are state transition diagrams in the prior art.

3 is a block diagram of a conventional pen input device.

Figure 4 is a flow chart showing the operation of the prior art.

5 is a state transition diagram in the present invention.

6 is a block diagram of an apparatus for practicing the present invention.

FIG. 7 is a circuit diagram illustrating an interface between a touch control block and a touch panel in FIG. 6. FIG.

8 is a detailed block diagram of a touch control block in FIGS. 6 and 7;

9 is an exemplary view illustrating a method of calculating a value Vd for mode conversion.

10 is a flowchart illustrating the operation of the present invention.

FIG. 11 is an operation flowchart for pen input processing in FIG. 10. FIG.

Figure 12 is an exemplary view showing a pen input method of the prior art.

Figure 13 is an exemplary view showing a pen input method of the present invention.

Explanation of symbols on the main parts of the drawings

210: touch panel 220: analog-to-digital converter

230: touch control block 231: switching control unit

232: interrupt detection unit 233: data comparison unit

234: pointing mode determination unit 235: dragging mode determination unit

236: interrupt control unit 237: register unit

In order to achieve the above object, the present invention provides a touch panel for sensing a touch of a tip, an analog / digital converter for sensing a voltage according to a pen contact on the touch panel in a pointing mode and a dragging mode, and converting the voltage into digital data. When the tip touches the touch panel, it recognizes the occurrence of an interrupt and sequentially supplies the voltage in the axial direction to the touch panel, and compares the data obtained from the digital data of the analog / digital converter with a reference value to determine the pointing mode or the dragging mode. And a touch control block for storing digital data in the analog-to-digital converter according to the corresponding mode, and when an interrupt request signal is generated in the touch control block, the pen input data stored in the touch control block is calculated to calculate an LCD image. Consists of CPIs that display dots or lines on It is characterized by.

The touch control block may include an interrupt detection unit for detecting an interrupt (INT) due to a pen touch on the touch panel, a switching control unit for sequentially supplying respective axial voltages of the touch panel when the interrupt (INT) is detected; And a register unit for storing a dragging mode value, a state value by mode determination, and an output data from the analog / digital converter, and a voltage Vd obtained from the output data of the analog / digital converter after detecting the interrupt INT. A data comparator which compares = (ΔL, ΔT) with a specific value, and a pointing mode determiner which determines whether the data is valid by comparing with a pointing mode value stored in the register when the voltage Vd is small from the comparison result; When the voltage Vd is large in the comparison result, it is determined whether the data is valid data by comparing with the dragging mode value DMCR stored in the register unit. Drag mode deciding unit and, when determining the pointing or dragging mode in the mode is characterized in that it consists of an interrupt controller for outputting an interrupt request signal (nIRQ) to ssipiyu (CPU).

In addition, the present invention is to determine the interrupt (INT) generation by the pen touch in order to achieve the above object, and if the interrupt (INT) is generated in the pointing mode by comparing the pen input value and a specific value stored in advance Or determining the dragging mode, comparing the pen input value with a pre-stored specific value according to the determined mode, and determining whether the data is valid data; Characterized in that the steps are carried out repeatedly.

The determining of the mode may include determining a pointing mode when the pen input value is smaller than a predetermined value, and determining a dragging mode when the pen input value is smaller than a predetermined value.

The pen input value may be obtained by continuously detecting a predetermined number of times alternately with respect to each axial direction.

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

FIG. 6 is a block diagram of an apparatus for an embodiment of the present invention, as shown therein, and a touch panel 210 for detecting contact of a tip and a pen contact on the touch panel 210 in a pointing or dragging mode. An analog / digital converter 220 that senses a voltage and converts it into digital data, and when a tip contacts the touch panel 210, recognizes that an interrupt is generated and generates voltages X + and X− in the touch panel 210. Supply Y +, Y- sequentially and calculate the digital data Pd (X, Y) in the analog-to-digital converter 220 to determine a pointing mode or dragging mode, and if the corresponding mode is determined, the analog / digital The touch control block 230 for outputting the digital data Pd (X, Y) from the converter 220, and when the interrupt request signal nIRQ is generated in the touch control block 230, the touch control block 230. Calculate data (Pd (X, Y)) stored in Constitute a ssipiyu 240 to display a point or line on the LCD than 250.

As illustrated in the block diagram of FIG. 8, the touch controller 230 includes an interrupt detector 232 for detecting an interrupt INT caused by a pen contact on the touch panel 210, and the interrupt INT described above. The switching control unit 231 for supplying voltages X +, X- (Y +, Y-) to the touch panel 210, mode values PMCR and DMCR, status values based on mode determination, and analogues. A register unit 237 for storing output data of the digital converter 220 and a voltage Vd = (ΔL, Δ obtained from the output data of the analog / digital converter 220 after detecting the interrupt INT. A data comparison unit 233 for comparing T) to a specific value, and a pointing mode for comparing the pointing mode value PMCR stored in the register unit 237 with the pointing mode value when the voltage Vd is small. The determination unit 234 and the voltage stored in the register unit 237 when the voltage Vd is large as a result of the comparison. A dragging mode determination unit 235 which determines whether the data is valid data compared to the dragging mode value DMCR, and an interrupt control unit which outputs an interrupt request signal nIRQ to the CPI 240 when the pointing mode or the dragging mode is determined. 236).

In the state where the pointing mode determiner 234 determines the pointing mode, when the voltage Vd obtained from the output data of the analog-to-digital converter 220 becomes greater than a specific value, the dragging mode determiner 235 enters the dragging mode. Determine whether valid data is determined.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

The operation of the present invention will be described with reference to the state transition diagram of FIG. 5. When an interrupt INT occurs in the Idle mode, the operation mode changes to the contact mode and digital data Pd sensed by the touch panel 210 in this state. When (X, Y)) is compared with arbitrary data Vd, when the comparison data Vd is large, the transition mode is shifted to the pointing mode, and when the comparison data Vd is small, the transition mode is dragged.

If the comparison data Vd becomes smaller than the digital data Pd (X, Y) in the state determined by the pointing mode, the transition to the dragging mode is performed.

Therefore, the above operation will be described in detail with reference to an example in which three values are processed during one scan time.

First, when the tip contacts the touch panel 210 in the Idle mode, a current path is formed from the resistor R3 to the ground (Y-) side, so the touch control block 230 detects the interrupt INT by the interrupt detector 232. The switching controller 231 which recognizes the transition to the contact mode by the detection of the interrupt INT sequentially supplies the voltages X +, X- (Y +, Y-) to the touch panel 210. .

At this time, if the voltages (X +, X-) (Y +, Y-) are sequentially supplied, as shown in the example of FIG. 13 during one scan time, the data on the X-axis is detected three times consecutively and the data on the Y-axis is 3 It will perform the detection operation in succession.

That is, since the interface between the touch control block 230 and the touch panel 210 is the same as the configuration of FIG. 7, an interrupt INT is generated so that the switching controller 231 generates a voltage X +, on the X axis of the touch panel 210. When X- is supplied, the analog-to-digital converter 230 converts the voltage Pa (X) on the touch panel 210 sensed through the channel ch1 into digital data Pd (X) to convert the touch control block. The operation of transmitting to 230 is performed three times in succession.

Thereafter, when the switching controller 231 applies the voltages Y + and Y- on the Y axis of the touch panel 210, the analog / digital converter 220 detects the voltage Pa (Y) through the channel ch2. ) Is converted into digital data Pd (Y) and transmitted to the touch control block 230 three times in succession.

In this case, when the voltages Pa (X) and Pa (Y) on the X and Y axes of the touch panel 210 are sensed three times, the touch control block 230 determines that the data comparator 233 is an analog / digital converter ( The voltage Vd obtained from the data value Pd (X, Y) at 220 is compared with a specific value for mode determination.

Accordingly, when the voltage Vd is smaller than the specific value, the state transitions to the pointing mode. When the voltage Vd is greater than the specific value, the state transitions to the dragging mode, and the transition mode is the state of the register unit 237. It is stored in a register (STATUS REGISTER).

In this case, when the transition to the pointing mode is performed, the pointing mode determination unit 234 transfers the data value Vd obtained from the digital data Pd (X, Y) of the analog / digital converter 220 to the register unit 237. It is determined whether the data is valid by comparing with the stored mode value PMCR.

Accordingly, when it is determined that the valid data is determined, the interrupt controller 236 transmits an interrupt request signal nIRQ to the CPI 240, and the CPI 240 reads a state value stored in the register 237 to determine a mode, and then the data. (Pd (X, Y)) is read and arithmetic processed to display on the LCD 250.

In addition, in the case of the transition to the dragging mode, the dragging mode determination unit 235 transfers the data value Vd obtained from the digital data Pd (X, Y) of the analog-to-digital converter 220 to the register unit 237. It is determined whether the valid data is compared with the stored mode value DMCR.

Therefore, when it is determined that the valid data is determined, when the interrupt controller 236 transmits the interrupt request signal nIRQ to the CPI 240, the CPI 240 stores data Pd (X, Y) stored in the register 237. After reading and processing the operation is displayed on the CD (250).

The above operation is performed in the same process as the operation flowcharts of FIGS. 10 and 11.

On the other hand, the data (Vd) for determining the transition mode and valid data is the touch control block 230 that receives the output data (Pd (X, Y)) of the analog-to-digital converter 220 is shown in the example of FIG. It is calculated by the method as shown.

That is, the analog / digital converter 220 digitally converts the voltage Pa (X, Y) sensed on the touch panel 210 to 'P0 (X0, Y0) and P1 (X1, Y1)' at predetermined intervals. Assuming that is obtained, the voltage Vd is obtained by obtaining the distance variable ΔL and the time variable ΔT through the following operation.

At this time, the analog-to-digital converter 220 performs a digital conversion in 1024 steps if the 10-bit analog-to-digital converter, it can operate in the dragging mode when three or more digital conversions.

When the input scan time to the touch panel 210 is about 100 Hz, assuming that 1 scan time is 10 ms and 5 scan time is basically required for the display of one point, while the tip down interrupt INT is valid, If the T 'value is more than 50ms, dragging mode can be executed.

Here, the 'L' and 'T' values vary depending on the size of the touch panel 210, and one scan time is affected by the conversion time of the analog / digital converter 220.

That is, when the pointing mode is determined, the distance variable ( ) Or time variable ( If) increases, it determines the transition to the dragging mode.

As described in detail above, the present invention eliminates the load of the system by performing pen input detection and mode discrimination in a separate touch control block and continuously performing a predetermined number of times in succession for each axis direction. This has the effect of smoothly displaying lines of poetry.

The present invention can achieve the accuracy of picture information management and handwriting recognition in an information terminal using a pen input device.

Claims (2)

A touch panel that senses touch of the tip, an analog / digital converter that senses the voltage according to the pen touch on the touch panel and converts it into digital data in the pointing mode and the dragging mode, and an interrupt (INT) when the tip touches the touch panel. Recognizing the occurrence of) and sequentially supplying the voltage in the axial direction to the touch panel, and determines the pointing or dragging mode by comparing the data (Vd) obtained from the digital data from the analog-to-digital converter with a reference value The digital data from the analog / digital converter according to the present invention is valid, and if the interrupt request signal (nIRQ) is generated in the touch control block, the pen input data stored in the touch control block is calculated and It consists of CPU, which displays dots or lines on the LCD. Pen input detection apparatus. A first step of determining an interrupt (INT) generation by the pen touch; a second step of determining whether the interrupt (INT) is generated in a pointing mode or a dragging mode; and a pen input value according to the mode determined above Comparing the previously stored reference value to determine whether the data is valid data, and if it is determined as valid data, performing a fourth step of displaying on the screen of the display device repeatedly.