JPH0437921A - Analog touch panel controller - Google Patents

Abstract

PURPOSE:To always detect the correct pushed positions of a touch panel by switching selectively the parameters for calculation of pushed positions in accordance with change in the lapse of time, the environmental change, etc. CONSTITUTION:A CPU 1 scans whether a touch panel 2 is pushed or not every fixed time. If so, the CPU 1 detects the pushed position of the panel 2 by means of a parameter based on the position data inputted through an A/D converter 3. Then the CPU 1 confirms the pushed part of an image shown on a display device 4 and then displays the part through the input processing. The parameter used for detection of the pushed position is changed into a parameter stored in an application program in response to a parameter switching instruction. Thus the correct pushed positions can always by detected on the panel 2 despite change in the lapse of time, the environmental change, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an analog touch panel control device that detects a pressed position when an analog touch panel is used.

[Prior Art] Conventionally, when detecting a pressed position using an analog touch panel, the pressed position was calculated according to fixed parameters stored on a system control ROM (read-on memory).

[Problem to be solved by the invention]

However, due to the way they are used, small computer devices such as handheld terminals are often used in harsh environments such as outdoors.On the other hand, in order to improve the man-machine interface, the above devices also have a touch panel as one of the input devices. In this case, when an analog touch panel is used, its characteristics may change greatly depending on the operating environment such as temperature and humidity.At this time, the detection of the pressed position may be difficult. This had the disadvantage that it would go awry, making accurate data entry impossible.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, to enable selection and switching of parameters for calculating the pressed position in response to changes in the analog touch panel over time, environmental changes, etc., and to always detect the correct pressed position. An object of the present invention is to provide an analog touch panel control device.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a device for detecting the pressed position of an analog touch panel, which stores in advance standard conversion parameters for converting the output of the touch panel into position data of the pressed X and Y positions. a first storage means for converting into the position data, a second storage means for storing in advance conversion parameters for converting into the position data but having contents different from the standard conversion parameters, and changing the conversion parameters to be used. and an instruction means for instructing the first instruction according to the instruction of the instruction means.
The present invention is characterized by comprising a control means for selectively switching between and using the conversion parameter of the first self-standard of the storage means and the conversion parameter of the second storage means.

[Function] In the present invention, the parameter for detecting the pressed position of the analog touch panel is stored in the application program in response to a parameter switching instruction, and the parameter is changed to a certain parameter. The correct pressed position can always be detected regardless of changes.

【Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of the configuration of a handy terminal having a plug-in touch panel according to an embodiment of the present invention. here,
1 is a CPU (Central Processing Unit) that controls the entire system; 2 is an analog touch panel, which is placed, for example, directly above the display 4; 3 is an A/D (analog-digital) converter, which converts the analog output of the touch panel 2 into a digital value. 5 is a power supply control circuit that monitors and controls the power supply of the system. 6 is a battery that is the power source of the system. A main memory 7 stores application programs including parameters, user data, etc., and is made up of, for example, RAM (random access memory). 8 is a system ROM (read only memory) in which control programs and fixed parameters are stored, and 9 is a printer that prints out the processing results of the CPU. IO is a parameter change switch for inputting an instruction to change a parameter.

In the above configuration, the touch panel 2 and the display 4 are arranged adjacent to each other, and based on the control program in the system ROMg, the CPU scans whether or not the touch panel 2 is pressed at regular intervals. If it is detected that the A/D
Based on position data input through the converter 3, the pressed position is detected using parameters, and which part of the image being displayed on the display 4 is pressed is recognized and displayed. Performs input processing.

FIG. 2 shows the procedure of the pressed position detection control operation according to the embodiment of the present invention. The CPU reads out the digital output value of the A/D converter 3 at regular intervals to check whether it is pressed or not. If it determines that it has been pressed, it sets it to X direction detection in step SIO and performs A/D conversion. Read the output value from device 3. In step Sll, it is checked whether there is an instruction to change the position conversion parameter in the X direction by the switch 10. If the change is not instructed, the standard parameter value on the system ROMg is used in step S12, and if the change is instructed, the standard parameter value on the system ROMg is used. In step 513, the parameter values on the application program are used, and in step S14, the output value of the A/D converter 3 is converted into X position data.

Next, in step S15, the detection is set in the Y direction, and the A/
In step S16, where the output value from the D converter 3 is read, it is checked whether there is an instruction to change the position conversion parameter in the Y direction by the switch 10, and if the change is not instructed,
In step S17, the conversion parameters on the system ROMg are read, and if a change is instructed, step S17
1g, the conversion parameters on the application program are read, and in step S19, the eight values of the A/D converter 3 are converted into Y position data.

Based on the converted X and Y data values, it is determined which part displayed on the display 4 is being pressed, and data input processing such as code conversion is performed.

As a specific example of the above-mentioned parameter change instruction, in the above embodiment, the parameter change switch 1O is selected by the operator, but the present invention is not limited to this. Of course, a switch equipped with a sensor for changing the change instruction may also be used. Further, the parameters are not limited to two types, fixed and changed, but may be configured so that a plurality of parameters can be changed in multiple stages.

〔Effect of the invention〕

As explained above, according to the present invention, even if the value output from the touch panel changes due to changes in the environment of the analog touch panel or changes over time, the pressed position can be determined by using the conversion parameters on the application program. The effect of being able to read correctly can be obtained. Furthermore, when the need arises to replace a touch panel or when a touch panel with the same characteristics as the one used at the time of manufacture is not available, the present invention can be used to replace a part of the application program without changing the system ROM. This has the advantage that it can be handled simply by changing the . Furthermore, the present invention has the advantage that even if there are large manufacturing variations when attaching a touch panel and a display device, it can be easily accommodated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a configuration example of a handy terminal having an analog touch panel according to an embodiment of the present invention, and FIG. 2 is a flowchart showing a pressed position detection processing procedure according to an embodiment of the present invention. 1...cpu. 2... Analog touch panel, 3... A/D converter, 4... Display unit, 5... Power supply control circuit, 6... Power supply battery, 7... Main memory, 8... - System ROM, 9... Printer, 10... Parameter change switch, 11... Bus.

Claims (1)

[Claims] 1) A device for detecting a pressed position on an analog touch panel, comprising: a device that stores in advance standard conversion parameters for converting the output of the touch panel into position data of the pressed X and Y positions; a second storage means that stores in advance conversion parameters that are conversion parameters for converting into the position data but whose content is different from the standard conversion parameters; and a second storage means that instructs to change the conversion parameters to be used. and control means for selectively switching between the standard conversion parameters of the first storage means and the conversion parameters of the second storage means in response to instructions from the instruction means. An analog touch panel control device characterized by: