JPS6378226A - Touch sensor controller - Google Patents

Abstract

PURPOSE:To automatically and precisely detect a position in response to the difference of displayed contents by correcting a touch operation position based on a display timing signal operating a display device and a video signal. CONSTITUTION:A display controller 7 displays data on the display device 8 according to a horizontal synchronizing signal H-SYNC, a vertical synchronizing signal V-SYNC and the video signal VIDEO. A calculation control processor 4 inputs said display timing signals H-SYNC and V-SYNC and the video signal VIDEO through an interface 6. Based on the display timing signals and the video signal the processor 4 calculates the correction quantity and corrects the detection quantity of a touch position detection circuit 2 through the position correction circuit 5. Thus the position in response to the difference of the displayed contents can be recognized automatically and precisely.

Description

[Detailed Description of the Invention] [1 Required] The timing of a display timing signal and a video signal outputted via a display control device for the same display device,
The display area differs depending on the amount of video signal. Therefore, position detection by a touch sensor attached to the front of the display and used for specifying the position also differs depending on the display timing signal and the video signal. Therefore, the touch sensor control device automatically adjusts the position detection of the touch sensor based on the display timing signal and the video signal.

[Industrial application field]

The present invention is attached to the front surface of a CRT display, and by specifying a position on the CRT display by touching it with a human finger, an instruction is given to a computer connected to the CRT display via the CRT display. The present invention relates to touch sensors used in man-machine communication.

[Conventional technology]

Touch sensors perform the same functions as keyboards and light pens by directly touching human fingers, but they are also used as data input devices in man-machine interfaces as interactive devices that are easier to operate than keyboards and light pens. They are used interchangeably.

A conventional example of a control device using such a touch sensor is shown in FIG. FIG. 9 shows an analog touch sensor control device.

The analog touch sensor control device includes a touch sensor 10 consisting of two opposing transparent resistive films 101 and 102;
It has a touch position detection circuit 2a' with a built-in bridge circuit and a differential amplifier, an A/D converter 3a', and a data output circuit 9a, and is connected to the CPU (
(not shown) etc. The touch sensor 10 is a CRT
It is attached to the front of a display (not shown). User is CR
The information displayed on the T display is visually recognized through the touch sensor 10, and a corresponding point on the CRT display is designated by pressing the touch sensor 10 with a finger. Transparent resistive film 10 of the touch sensor due to finger pressure. , 10□ are in contact, X
The resistance ratio changes depending on the pressing point in two directions: the direction and the Y direction. This resistance change in the X direction and the Y direction is detected by the touch position detection circuit 2a' and converted into a digital quantity by the A/D converter 3a/. The data output circuit 9a outputs the digitally converted position data to the CPU via the interface 9b.

As a result, the position of the CRT display can be specified directly by detecting the pressed position on the touch sensor 10, and indirectly by detecting the pressed position on the touch sensor 10.

Such a touch sensor control device recognizes the X and Y coordinates of a touch position on a touch sensor as a coordinate position corresponding to a position on a CRT display surface, and sends data to a CPU.

However, CRTs are sometimes connected to and driven by various so-called personal computers. In this case, the content to be outputted via the personal computer, more specifically via the display control device and displayed on the CRT is determined by the control signals from the display control device, especially the horizontal synchronization signal 1l.
-5YNC1 It varies depending on the display timing signal such as the vertical synchronizing signal V-5YNC, the timing of the video signal VIDEO and the display timing signal, and the length of the video signal. In particular, the display area on the CRT also differs.

Due to these display areas, the position recognition in the touch sensor control device must be different depending on the display area, even when the same point on the touch sensor is touched, for example.

[Problem that the invention seeks to solve]

Adjustment of position recognition associated with such display contents has conventionally been performed by manually adjusting variable resistors for position adjustment in the horizontal and vertical directions.

However, such manual adjustment is troublesome and lacks accuracy. Also,
It is difficult to match such manual adjustment with position recognition by the touch sensor control device.

Furthermore, using a touch sensor with characteristics depending on the displayed content,
Although it is conceivable to use different touch sensor control devices designed to meet such characteristics, there is a problem in that they lack versatility.

In addition to the analog type mentioned above, the touch sensor control device uses a touch sensor composed of a key matrix,
Although there is a digital touch sensor control device that detects coordinate positions in the X and Y directions in a matrix, the above-mentioned problem does not occur. Therefore, the above problem is considered to be unique to analog type touch sensor controlled goggles. However, in the digital type, the touch recognition position is fixed and cannot be adjusted to follow the state of the video signal.

[Means to solve the problem]

An object of the present invention is to automatically and accurately recognize positions associated with differences in display content using relatively simple means.

FIG. 1 shows a basic block diagram of the touch sensor control device of the present invention.

The analog touch sensor control device includes a touch sensor 1 mounted on the front surface of a display 8, and a touch position detection circuit 2.
, A/D converter 3, calculation side '4111 processor 4
, a position correction circuit 5. Further, the touch sensor control device is connected to a display control device 7 via an interface 6.

The touch sensor 1 is the touch sensor 10 in FIG. 9, the touch position detection circuit 2 is the touch position detection circuit 2a' in FIG. 9, and the A/D converter 3 is the A/D converter 3 in FIG.
This is similar to converter 3a'. These will be explained in detail in Examples.

[For production]

The display control device 7 is shown in FIG. 2 (aHb) and FIG. 3 (a).
Based on the horizontal synchronizing signal H-5YNC1, the vertical synchronizing signal V-5YNC, and the video signal VIDEO shown in (b), the display 8
Display data on top. The arithmetic control processor 4 receives these display timing signals H via the interface 6.
-SYNC, V-5YNC and video signal VIDEO are input.

The time difference 1N between 1-SYNC (horizontal synchronization signal) and the beginning of the video signal VIDEO is from the horizontal start point HD of the display device in FIG. length ff1)
A or the duration tA respectively indicate the horizontal display span 5PN)l in the display of FIG. Also, the vertical synchronization signal V-5YNC and the first raster video signal VIDE
The time difference of 1v from the first data of O is from the vertical starting point VDs in FIG.
Horizontal synchronization signal 1l-5Y until -5YNC is input
Number of NCOs or time between them 1! l indicates the vertical span 5PNv.

The arithmetic control processor 4 calculates the correction amount based on the above parameters, and corrects the detection amount of the touch position detection circuit 2 via the position correction circuit 5. That is, the X-side bias of the touch sensor is adjusted according to the difference between the above-mentioned 1M and the default, and the Y-side bias of the touch sensor is adjusted according to the difference between 1V and the default (FIG. 4). Furthermore, A
Or, based on tA, B, or L8, Y side and Y side gain adjustment is performed.

The above default calculation is performed based on a value that is corrected via the position correction circuit 5 when the reference position on the touch sensor is touched and pressed, A/D converted, and manually entered into the arithmetic control processor 4. .

Horizontal synchronization signal +1-5YNC1 Vertical synchronization signal V-5YN
Since the timing and amount of the C2 video signal VIDEO differ depending on the display control device, the above position correction is performed for these different signals. As a result, the position recognition data of the touch sensor is also position-corrected for the content actually displayed, and is output as data having a one-to-one correspondence with the display content.

Note that the above correction operation is performed only at the time of initial setting.

〔Example〕

FIG. 5 shows a more specific circuit diagram of the touch sensor type '+11 device shown in FIG. 1, and the circuit shown in FIG. 5 and its operation will be described below.

The touch sensor 10 is composed of two transparent electrode films 101° and 10□, and is the same as that shown in FIG.

The bridge and amplifier circuit 2a includes a constant current source 20, bridge resistors 21-24, resistors 25 and 26, a transistor 27, and differential amplifiers 28 and 29. The bridge circuit is connected as shown in the equivalent circuit in FIG. 6, and includes a transparent electrode film 10 that changes depending on the pressing point on the touch sensor 10. , 10□ resistors ROA, ROII are operatively connected to one side of the pre-fuji. The bridge is configured so that when the touch sensor 10 is pressed, the transistor 27 is turned on, and when the touch sensor 10 is released, the transistor 27 is turned off. transistor 2
The start and stop of touch operations can be detected by turning on and off 7. Differential amplifiers 31 and 35 cooperate with peripheral resistors 32, 33i36 and 37, respectively, and convert resistance changes in the X direction and Y direction that vary depending on the pressing point to the constant current source 2.
A current from 0 is differentially input as a voltage, and a voltage signal corresponding to the X-direction and Y-direction coordinate positions is output. A/
The D converter 3 converts these into digital data and outputs them as X-direction position data x and y-direction position data Y to the arithmetic control processor 4a.

An X-side gain adjuster 51 and a Y-side gain adjuster 5 are provided between the differential amplifiers 31 and 35 and the A/D converter 3, respectively.
3 is connected. Furthermore, the X-side gain adjuster 51 and the X-side gain adjuster 53 are connected to resistors 852 and 5 connected to the line to which the base input sides of the differential amplifiers 31 and 35 are input.
The outputs of an X-side bias adjuster 55 and a Y-side bias adjuster 58 are connected in parallel with 4. Resistors 56, 57,
59 and 60 are connected. These regulators and related circuits constitute the position correction circuit 5.

Gain adjusters 51, 53, bias adjusters 55, 5
8 are digital gain adjustment setting values GX, GY, and bias adjustment setting values BX, BY, which are all sent from the arithmetic control processor 4a, for example, similar to the D/A converter.
It outputs an analog voltage according to the voltage.

7(a)(b) and FIG. 8(a)(b) show one of the specific examples of FIGS. 2(a)(b) and 3(a)(b). In this example, horizontal synchronization frequency fH=1
5.75KIlz,, LH=9.9 μS-, tA=3
9.7μs, A = 640 dots, vertical synchronization frequency fv = 60.1145Hz, tv = 1.505
m5, tm = 12.698 m5°B = 200 horizontal synchronization lines (H).

Adjustments are made as follows.

First, as shown in FIG. 4, the optimum gain/bias value X in the touch sensor area. , adjust Fi51 to Yo
, 53, 55, and 58 are initialized.

Next, (HDs, VDs), (HDs, VDe
), (lIDe, VDs), (1!De, VD
e), (lIDm, VDs), (HDs, VDm)
A test video signal that outputs certain data is output on the touch sensor screen at the 6 coordinates of .

In the test signal output state, first the coordinates (lIDm, VD
Touch m). This means that the X coordinate bias point in the current test signal is set in the internal arithmetic control processor. Similarly, the coordinates (HDs,
By touching VDn+), the Y coordinate bias point is set in the internal arithmetic control processor. Then, by touching the coordinates (IIDs, VDs), the saturation gain values of the X and Y coordinates are set in the arithmetic control processor.

The above settings and the current test signal status (tH + tA + tv + j8 in Figures 2 and 3)
Based on this, various default values for gain and bias adjustment are stored in a non-volatile memory within the arithmetic and control processor.

After this adjustment (usually done at the time of shipment), the touch position recognition will adjust the pre-stored default values to different display timing signals and video signals.
Based on this, the arithmetic control processor calculates the correction and automatically adjusts it.

The touch sensor control device in FIG. 5 is as shown in FIGS. 7(a) and (b).
, the display timing signal and video signal VIDEO with parameters different from those shown in FIGS. 8(a) and 8(b) are also adjusted in the same manner as described above.

The above-described alignment work can be performed not only in the initial state but also when position recognition becomes incorrect due to temperature, aging, etc.

〔Effect of the invention〕

As described above, according to the present invention, touch position recognition can be automatically performed in accordance with different display timing signals and video signals. Further, according to the present invention, it is possible to correct errors in position detection and correction of errors in position recognition, and accurate position recognition becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a principle block diagram of the touch sensor control device of the present invention, and FIGS. 2(a), (b) and 3(a) and (b) show the display timing signal and video signal on the display device of FIG. Figure 4 is a diagram showing the timing of Figure 1 and the display contents on the display unit. FIG. 5 is a diagram showing the position correction of the touch sensor according to the embodiment of the present invention. I+1 device circuit diagram, Figure 6 is a bridge circuit diagram in the touch position detection circuit in Figure 5, Figures 7 (a) (b) and 8 (aHb) are Figure 2 (
FIG. 9 is a block diagram of a conventional touch sensor control device. (Explanation of symbols) 1... Touch sensor, 2... Touch position detection circuit, 3... A/D converter, 4... Arithmetic control processor, 5... Position correction circuit, 6... interface,
7...Display control device, 8...Display device, 51,
53... Gain adjuster, 55, 58... Bias adjuster.

Claims (1)

[Claims] 1. Two opposing transparent electrode films (10_1, 10_2)
In the touch sensor control device, the position of the screen of the display device is specified via a touch sensor (1) that is attached to the front surface of the display device and taken out as a resistor according to the touch operation position. A touch sensor control characterized in that a touch operation position on the touch sensor is corrected in advance based on a display timing signal (H-SYNC, V-SYNC) for operating a display device and a video signal (VIDEO). Device.