JPS60175136A - Input/output uniting system of written picture - Google Patents

Abstract

PURPOSE:To remove malfunction of a tablet due to refresh noise without reducing accuracy by fixing a driving period of a coordinate input part by a signal synchronized with a synchronizing signal obtained in each picture of a picture output part. CONSTITUTION:A display 2 is controlled by a control part 6 through a display synchronizing circuit 11, tablet clocks from an oscillator 12 are counted by a timer 13 and a prescribed signal is sent to the tablet 1 through a tablet synchronizing circuit 5 at every fixed period to drive the tablet 1. The timer output is generated in a period other than a period generating refresh noise due to a vertical synchronizing signal VS from the display 2.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a stroke input/output device that integrates a tablet and a rasp scan type display, and in particular, to prevent deterioration of the resolution of the tablet due to noise when refreshing the screen of the display. This invention relates to an end face input/output integration method that is avoided.

(2) Background of the technology Voice communication by telephone and other means has become the mainstream for instant mutual communication, but depending on the content you want to convey to the other party,
It is often easier for the other person to understand if you explain using pictures rather than just words. Therefore, combined communication of voice and strokes is being considered. For users who are accustomed to writing on regular paper, the image output screen (display) and coordinate input panel (
Since it is a burden to look at the tablet alternately, it is effective to integrate the display and the tablet.0 Fig. 1 is a block diagram of the tablet of a device that integrates the display and the tablet. In the figure, 1 is a tablet, 2 is a display, 3 is a tablet coil, and 4 is a tablet drive circuit (TBL-DRV).
, 5 is a tablet synchronization circuit (TBL-8YC), 6 is a control unit, 7 is an input vent, 8 is an amplifier (AMP), and 9 is a phase detector (PD).

In FIG. 1, the tablet 1 uses a magnetic field coupling type. The tablet synchronization circuit 5 operates the tablet drive circuit 4 at regular intervals, and the tablet drive circuit 4 causes currents with different phases to flow through the tablet coils 3 to create a magnetic field. This magnetic field is an alternating magnetic field with a different phase for each tablet coil.

The input pen 7 has a coil and detects the voltage corresponding to the alternating magnetic field at the position indicated through the display 2. This voltage is amplified by an amplifier 8 and input to a phase detector 9. The phase detector 9 calculates and outputs an X coordinate value and a Y coordinate value from the phase of the input from the amplifier 8.

Display 2 is EL (Electro-Lumi)
Then, an electric field is applied to the light-emitting body of each pixel to cause it to emit light using a laskscan. Then, screen i 1J is refreshed every - screen. At this time, noise appears in the output of the input ben. Therefore, there is a need for an integrated stroke input/output device that is free from the influence of noise caused by this refresh.

(3) Conventional technology and problems A conventional integrated stroke input/output device will be described below.

Figure 2 is the traditional equal-painting car Hayashi! This is a block diagram regarding synchronization between the a'8p display and the tablet.
In the figure, 1 is a tablet, 2 is a display, 5 is a tablet synchronization circuit (TBL-SYC), 6 is a control unit (CONT), 10 is a timer (TM), 11 is a display synchronization circuit (DSP-SYC), and 12 is a A clock generator, VD is a video signal, DC is a display clock, H8 is a horizontal synchronization signal, vS is a vertical synchronization signal, TC is a tablet controller, and 'T is a timer output.

FIG. 3 is a time chart related to FIG. 2, in which (a) is the vertical synchronization signal, (b) is the noise caused by refreshing the display, and (C) is the timer output, T
D indicates the tablet driving period.0 In the conventional integrated stroke/drawing output method, as shown in FIG. It is controlled by sending a clock DC, a horizontal synchronization signal H8, and a vertical synchronization signal vS, and the timer 10 counts and measures the tablet clock from the oscillator 12 with a frequency unrelated to the display synchronization circuit 11, periodically for a certain period of time. (TD) A signal that becomes L level is sent to the tablet synchronization circuit 5, and the tablet synchronization circuit 5 drives the tablet every time the signal becomes L level.

In the above-mentioned conventional tilted person output integration method, the display 2
Since the synchronization of the tablet 1 and the synchronization of the tablet 1 are unrelated, as shown in FIG. 3, noise N due to refreshing synchronized with the vertical synchronization signal vS of the display 2 occurs during the tablet drive period TD, causing the tablet 1 to malfunction. Sometimes I end up doing it. It is possible to remove this noise by applying a filter to the output of the input pen, but in that case, the amount of hardware increases accordingly, and the detection accuracy also deteriorates, which is difficult to do. .

(4) Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional art and to provide an integrated stroke input/output method that eliminates malfunctions of the tablet due to refresh noise without deteriorating accuracy through simple improvements. It is in.

(5) Structure of the Invention According to the present invention, in a stroke input/output device that integrates a coordinate input section and an image output section that performs display by rask scan and is refreshed every screen, the image output Each screen is characterized by having a clock means for receiving a synchronization signal for each screen of the unit and generating a periodic signal synchronized with the synchronization signal, and determining a driving period of the coordinate input unit based on the periodic signal. This is achieved by providing an integrated input/output system.

(6) Examples of the invention Examples of the present invention will be described below.

FIG. 4 is a block diagram of the synchronization between the display and tablet of the integrated stroke input/output system according to the embodiment of the present invention, in which 1 is the tablet, 2 is the display,
5 is a tablet synchronization circuit (TBL-8￥C), 6 is a control unit (C0NT), and 11 is a display synchronization circuit (DS
P-8YC), 12 is the clock generator, 13 is the timer (
TM), VD is the video signal, DC is the display clock, H8 is the horizontal synchronization signal, vS is the vertical synchronization signal, TC is the tablet synchronization signal, and T is the timer output. This is a chart in which (a) shows a vertical synchronization signal, (b) shows noise due to display refresh, (c) Ifi timer output, and TD shows a tablet driving period.

In the image input/output integrated device according to the embodiment of the present invention shown in FIG. 4, the timer TM is different from that in FIG.

In FIG. 4, the timer counts the tablet clock from the generator 12 and periodically sends a signal that becomes L level for a fixed period (TD) to the tablet synchronization circuit 5, but the vertical synchronization of the display As shown in FIG. 5, the count value is controlled by the signal so that the timer output T becomes L level while avoiding the period in which refresh noise N occurs. Therefore, no refresh noise occurs when the tablet is driven.

(7) Effects of the Invention As described above, according to the present invention, malfunctions of the tablet due to refresh noise can be eliminated without deteriorating accuracy by a simple improvement of synchronizing the timer output with the vertical synchronization signal of the display. There is an effect that it can be done.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a @-type tablet that integrates a display and a tablet, Fig. 2 is a block diagram of synchronization of the conventional integrated stroke input/output system, and Fig. 3 is a time chart related to Fig. 2. FIG. 4 is a block diagram of the synchronization of the equal image input/output integration system according to the embodiment of the present invention, and FIG. 5 is a time chart regarding FIG. 4. 91. In the drawings. 1 is a tablet, 2 is a display, 3 is a tablet coil, 4 is a tablet drive circuit, 5 is a tablet synchronization circuit, 6 is a control unit, 7 is an input pen, and 8 is an amplifier'! ', 9 is a phase detector, 10 and 13 are timers, 11 is a display synchronization circuit, 12 is an oscillator, V
D is a video signal, DC is a display clock, H8 is a horizontal synchronization signal, vS#'i vertical synchronization signal, TC is a tablet clock, T is a timer output, and N is a refresh noise. Agent Patent Attorney Hiroshi Matsuoka Hiro Shibe 2[1′! fr-3 Kunifu April Monthly Book 5 mlρ Io /ρ 1ρ

Claims (1)

[Claims] In a stroke input/output device that integrates a coordinate input section and an image output section that performs display by rask scan and is refreshed for each screen, a synchronization signal for each screen of the image output section is received and synchronized with the synchronization signal. 1. A stroke input/output integrated system, comprising: a timer for generating a periodic signal, the periodic signal determining a driving period of the coordinate input section.