TWI412961B - Apparatus and method for controlling touch screen - Google Patents

Abstract

An apparatus for controlling a touch screen includes a touch-checking apparatus, a humidity-sensing apparatus, and a humidity-compensating apparatus. The touch-checking apparatus is used for receiving a touch-sensing signal sent from the touch screen, and converting the touch-sensing signal to a touch-operating signal. The touch-operating signal may be used for determining a touching point and a touching manner. The humidity-sensing apparatus is used for sensing an environmental humidity, and generating a humidity-sensing signal. The humidity-compensating apparatus is used for outputting a controlling signal to the touch-checking apparatus, for adjusting a gain during the conversion of the touch-sensing signal to the touch-operating signal.

Description

Touch screen control device and control method

The invention relates to a control device and a control method for an input tool, in particular to a control device and a control method for a touch screen.

Traditional electronic devices, such as electronic dictionaries, mobile phones, personal digital assistants (PDAs), multimedia terminals, etc., often use a keyboard as an input tool to facilitate user input of text and instructions. However, using the keyboard as an input device not only takes up a large volume. And the key of the keyboard and the oxidation of the contacts on the key particles are likely to cause damage to the keyboard.

More and more electronic devices are beginning to use the touch screen as an input device, and the touch screen integrates the input device and the display screen into one body, and has the characteristics of small size and not easy to be damaged. Common touch screens include resistive touch screens, capacitive touch screens, infrared touch screens, and surface acoustic wave touch screens.

When the touch screen is used, when the user touches the screen, a contact is formed between the skin or the finger and the touch screen, and after detecting by the contact detecting device, the controller of the touch screen can calculate the coordinates of the contact; The message of the contact coordinate is transmitted to the relevant processing unit of the electronic device, so that the message input by the user can be determined.

The electrical performance of the touch screen detection device and the screen itself is easily affected by the environment, especially in a high humidity environment, the touch screen of the resistive touch screen, the capacitive touch screen, etc., due to the change of the resistance value and the capacitance value with the humidity, the response sensitivity, Accuracy of contact detection and contact coordinate calculation will cause errors, which seriously affect the working performance of the touch screen and electronic equipment, causing inconvenience to the user.

In view of this, it is necessary to provide a control device that can adapt to the environmental humidity touch screen.

In addition, it is also necessary to provide a control method for a touch screen that can adapt to environmental humidity.

A touch screen control device includes a touch detection device, a humidity detection device, and a humidity compensation device. The touch detection device is configured to receive a touch sensing signal of the touch screen, and convert the touch sensing signal into a touch operation signal to determine a touch manner and a contact coordinate. The humidity detecting device is configured to detect ambient humidity to generate a humidity detecting signal. The humidity compensation device is configured to send a corresponding control signal to the touch detection device according to the humidity detection signal to adjust a gain of the touch detection device when performing signal conversion.

A touch screen control method includes: receiving a touch sensing signal of a touch screen; converting the touch sensing signal into a touch operation signal to determine a touch mode and a contact coordinate; The ambient humidity is detected to obtain a humidity detection signal; the corresponding control signal is generated according to the humidity detection signal; and the gain when the touch sensing signal is converted is adjusted by the control signal.

The above-mentioned touch screen control device and control method appropriately adjust the conversion of the touch sensing signal of the touch screen by measuring the ambient humidity, thereby ensuring the working stability of the touch screen under various humidity conditions, and not appearing due to a large humidity difference. The phenomenon of contact drift.

100‧‧‧Electronic equipment

102‧‧‧ touch screen

104, 200, 400‧‧‧ touch screen control device

106‧‧‧Central Processing Unit

202, 402‧‧‧ display drive

204, 404‧‧‧ touch detection device

208, 408‧‧‧ Humidity compensation device

206, 406‧‧‧ Humidity testing device

412‧‧‧Signal receiving module

414‧‧‧ Humidity-gain correspondence table

416‧‧‧Query Module

418‧‧‧Signal transmission module

302~312, 602~612‧‧‧ touch screen control method flow

1 is a schematic view showing the structure of an electronic device using a touch panel control device of a preferred embodiment.

2 is a schematic structural view of a touch screen control device according to a preferred embodiment.

3 is a flow chart of a control method for controlling a touch screen according to ambient humidity by a touch screen control device according to a preferred embodiment.

4 is a schematic structural view of a touch screen control device according to another preferred embodiment.

FIG. 5 is a schematic diagram showing the correspondence between the ambient humidity set in a preferred embodiment and the gain of the touch detection device.

6 is a flow chart of a control method for controlling the touch screen according to the ambient humidity by the touch screen control device shown in FIG. 4.

Please refer to FIG. 1, which is a schematic structural diagram of an electronic device using the touch screen control device of the preferred embodiment. The electronic device 100 includes a touch screen 102 The touch screen control device 104 and the central processing unit 106.

The touch screen 102 is configured to display a message, such as a text message, a multimedia message, an operation interface, etc., to the user, and provide a user input interface, and accept a user input message, and generate a touch sensing signal according to the touch action of the user, the touch The inductive signal is transmitted to the touch screen control device 104 for processing.

The touch screen control device 104 is configured to provide a display message to the touch screen 102, and simultaneously convert the touch sensing signal transmitted by the touch screen 102 to determine a contact of the user on the touch screen 102 to generate a corresponding touch operation message, where the touch operation message includes touch Point coordinates, user touch methods (such as clicking or double-clicking). The touch screen control device 104 is further configured to appropriately adjust the conversion gain of the touch sensing signal according to the ambient humidity, so that the electronic device 100 can ensure the accuracy of the input message under various humidity conditions.

The central processing unit 106 is configured to provide the touch screen control device 104 with an image message to be displayed by the touch screen 102, and receive the touch operation message sent by the touch screen control device 104, and according to the final message that the user inputs the touch operation message.

As shown in FIG. 2, it is a schematic structural diagram of a touch screen control device of a preferred embodiment. The touch screen control device 200 includes a display driving device 202, a touch detecting device 204, a humidity detecting device 206, and a humidity compensating device 208.

The display driving device 202 is configured to receive the image signal provided by the central processing unit 106 and send a display driving signal to the touch screen 102 to drive the touch screen 102 to display a message, such as a text message, a multimedia message, an operation interface, and the like, to the user.

The touch detection device 204 is configured to receive the touch sensing signal sensed by the touch screen 102 and convert the touch operation signal into a touch operation message that can be processed by the central processing unit 106. The conversion process may include a series of processes such as signal strength measurement, signal amplification, filter denoising, analog/digital (A/D) conversion, touch mode (click/double click) determination, and contact coordinate determination. Wait.

The humidity detecting device 206 is configured to detect the humidity of the surrounding environment to generate a humidity detecting signal, and send the humidity detecting signal to the humidity compensating device 208. The humidity detecting device 206 can be an integrated temperature and humidity sensor of the SHT1x/SHT7x series of Sensirion.

The humidity compensation device 208 is configured to send a corresponding control signal to the touch detection device 204 according to the humidity detection signal generated by the humidity detection device 206, thereby adjusting the gain of the touch detection device 204 during the signal conversion process to generate the touch. The operation signal can adapt to changes in ambient humidity. In the case where the ambient humidity is high, the conductive performance of the touch screen 102 becomes strong, and even if there is only a slight touch on the surface of the touch screen 102, the touch sensing signal sensed by the touch screen 102 is stronger, thereby causing subsequent processing of the touch. Signal saturation distortion occurs when sensing signals. Therefore, based on the humidity detection signal generated by the humidity detecting device 206, the humidity compensation device 208 can generate a corresponding control signal. The control signal is used to reduce the gain of the touch detection device 204 when the ambient humidity is large, and to increase the gain of the touch detection device 204 when the ambient humidity is small, thereby avoiding signal saturation distortion or humidity when the humidity is high. The hourly touch sensitivity is reduced. The generation of the above control signals and their detection for touch The adjustment of the gain of the measuring device 204 can be performed by a Programmable Logic Device (PLD) or an Auto Gain Control (AGC) circuit in the analog circuit.

Referring to FIG. 3, it is a flow chart of a control method for controlling the touch screen according to the ambient humidity of the touch screen control device of the preferred embodiment.

Step 302, after the system is initialized, the touch detection device 204 performs the conversion of the touch sensing signal with a predetermined initial gain.

In step 304, the humidity detecting device 206 detects the ambient humidity and generates a humidity detecting signal to be sent to the humidity compensating device 208.

Step 306, the humidity compensation device 208 compares the received humidity detection signal with a predetermined first threshold to determine whether the humidity detection signal is greater than a predetermined first threshold. The first threshold corresponds to the predetermined first humidity, and thus the comparison determines whether the ambient humidity is greater than a predetermined high humidity value.

Step 308, if the comparison result of the humidity compensation device 208 in step 306 is that the ambient humidity is greater than the predetermined humidity high value, the humidity compensation device 208 sends a decrease gain control signal to the touch detection device 204 to reduce the gain of the touch detection device 204.

Step 310, if the comparison result of the humidity compensation device 208 in step 306 is that the ambient humidity is less than the predetermined humidity high value, the humidity compensation device 208 compares the humidity detection signal sent by the humidity detecting device 206 with a predetermined second threshold to determine Whether the humidity detection signal is less than a predetermined second threshold. The second threshold corresponds to the predetermined second humidity, so that the environment can be determined by the comparison Whether the degree is less than the predetermined low humidity value.

Step 312, if the comparison result of the humidity compensation device 208 in step 310 is that the ambient humidity is less than the predetermined humidity low value, the humidity compensation device 208 sends an increase gain control signal to the touch detection device 204 to increase the gain of the touch detection device 204.

Step 314, if the comparison result of the humidity compensation device 208 in step 310 is that the ambient humidity is greater than the predetermined humidity low value, the humidity compensation device 208 sends a normal operation control signal to the touch detection device 204, so that the touch detection device 204 is still in the initial state. Set the gain to convert the touch sensing signal.

The touch screen control device and the control method appropriately adjust the conversion of the touch sensing signal of the touch screen by measuring the ambient humidity, and appropriately reduce the gain when the humidity is high and the conductive performance of the touch screen is strong, and when the humidity is low and the conductive performance of the touch screen is weak. Appropriately increase the gain, so as to ensure the stability of the touch screen under various humidity conditions, and the phenomenon of "contact drift" does not occur due to the large difference in humidity.

In other embodiments, the humidity compensation device 208 can also be used to classify the ambient humidity and adjust the gain of the touch detection device 204 to different degrees depending on the result of the classification to obtain a more accurate result.

Please refer to FIG. 4 , which is a schematic structural diagram of a touch screen control device according to another preferred embodiment. The touch screen control device 400 can control the conversion of the touch screen sensing signals with different levels of gain according to the classification of the ambient humidity. The touch screen control device 400 includes a display driving device 402, a touch detecting device 404, and a wet Degree detecting device 406 and humidity compensating device 408.

The display driving device 402 is configured to receive the image signal provided by the central processing unit 106 and send the display driving signal to the touch screen 102 to drive the touch screen 102 to display a message, such as a text message, a multimedia message, an operation interface, and the like, to the user.

The touch detection device 404 is configured to receive the touch sensing signal sensed by the touch screen 102, and convert the touch operation signal into a touch operation signal that can be processed by the central processing unit 106, such as analog/digital (A/D) conversion.

The humidity detecting device 406 is configured to detect the humidity of the surrounding environment to generate a humidity detecting signal, and send the humidity detecting signal to the humidity compensating device 408. Preferably, the humidity detecting device 406 can adopt an integrated temperature and humidity sensor of the SHT1x/SHT7x series of Sensirion.

The humidity compensation device 408 is configured to send a corresponding control signal to the touch detection device 404 according to the humidity detection signal generated by the humidity detection device 406, thereby adjusting the gain of the touch detection device 404 when performing signal conversion, and generating the touch operation signal. Can adapt to changes in environmental humidity. The humidity compensation device 408 includes a signal receiving module 412, a humidity-gain correspondence table 414, an inquiry module 416, and a signal transmission module 418.

The signal receiving module 412 is configured to receive the humidity detecting signal sent by the humidity detecting device 406, and send the humidity detecting signal to the query module 416 for sending the corresponding query command to the humidity-gain correspondence table 414.

The humidity-gain correspondence table 414 stores a correspondence table between the preset environmental humidity and the gain value. According to the query instruction transmitted by the query module 416, The humidity-gain correspondence table 414 returns a gain value corresponding to the humidity detection signal to the query module 416.

The query module 416 is configured to send a query command to the humidity-gain correspondence table 414 according to the received humidity detection signal, and perform an inquiry in the humidity-gain correspondence table 414 to obtain a gain value that should be controlled corresponding to the humidity. The query module 416 is further configured to transmit the gain value returned by the humidity-gain correspondence table 414 to the signal sending module 418.

The signal sending module 418 is configured to send a corresponding control signal to the touch detecting device 404 according to the gain value transmitted by the query module 416 to adjust the gain of the touch detecting device 404 when performing signal conversion.

Referring to FIG. 5, it is a schematic diagram of the correspondence relationship between the ambient humidity and the gain set by the humidity-gain correspondence table 414 in a preferred embodiment. When the ambient humidity is high, since the conductive property of the touch screen becomes strong, a slight touch may be sensed and a strong touch sensing signal is generated, so that the gain of the touch detecting device 404 is set small; and when the ambient humidity is low, The conductive performance of the touch screen becomes weak, and the user may need a strong touch to be sensed, so that the gain of the touch detecting device 404 is set to be large. With the above arrangement, it is possible to prevent the user from operating with different touch forces under different environmental humidity conditions, thereby maintaining operational consistency.

Please refer to FIG. 6 , which is a flow chart of a control method for controlling the touch screen according to the ambient humidity by the touch screen control device shown in FIG. 4 .

Step 602, the humidity detecting device 406 detects the ambient humidity and generates a humidity detecting The signal is sent to the humidity compensation device 408.

Step 604, the signal receiving module 412 of the humidity compensation device 408 receives the humidity detection signal, and transmits the humidity detection signal to the query module 416.

In step 606, the query module 416 sends a query command to the humidity-gain correspondence table 414 according to the received humidity detection signal to query the humidity-gain correspondence table 414 for the gain value corresponding to the ambient humidity.

In step 608, the humidity-gain correspondence table 414 returns the query result to the query module 416, thereby obtaining a corresponding gain value.

In step 610, the query module 416 sends the queried gain value to the signal sending module 418.

Step 612, the signal sending module 418 sends a corresponding control signal to the touch detecting device 404 according to the received gain value to adjust the gain of the touch detecting device 404 when performing signal conversion.

The above touch screen control device and control method classify the ambient humidity by measuring the environmental humidity, and control the conversion gain of the touch sensing signal for the touch screen according to different levels of the ambient humidity, and convert when the ambient humidity is at a high level and the touch screen is highly conductive. The gain is small, and the conversion gain is large when the ambient humidity is at a low level and the conductive performance of the touch screen is weak, so that the stability of the touch screen can be accurately controlled under various humidity conditions.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and is familiar with the present invention. The equivalent modifications or changes made by the person in charge of the case in the spirit of the creation of the case shall be included in the scope of the following patent application.

102‧‧‧ touch screen

106‧‧‧Central Processing Unit

200‧‧‧ touch screen control device

202‧‧‧Display drive

204‧‧‧Touch detection device

206‧‧‧Humidity detecting device

208‧‧‧Humidity compensation device

Claims (11)

A touch screen control device includes a touch detection device, configured to receive a touch sensing signal of a touch screen, and convert the touch sensing signal into a touch operation signal to determine a touch mode and a contact coordinate; The touch screen control device further includes a humidity detecting device and a humidity compensation device; the humidity detecting device is configured to detect the ambient humidity to generate a humidity detecting signal; the humidity compensating device is configured to send a corresponding control signal to the touch detecting according to the humidity detecting signal And a device for adjusting a gain of the touch detection device when converting the touch sensing signal into a touch operation signal. The control device for a touch screen according to claim 1, wherein the humidity compensation device is configured to first compare the humidity detection signal with a predetermined first threshold to determine whether the ambient humidity is higher than a predetermined humidity. a value; if the result of the first comparison indicates that the ambient humidity is higher than a predetermined high humidity value, the humidity compensation device sends a first control signal to the touch detection device to reduce the gain of the touch detection device when performing signal conversion. . The control device for a touch screen according to claim 2, wherein: the humidity compensation device is configured to: when the result of the first comparison indicates that the ambient humidity is lower than a predetermined high humidity value, the humidity detection signal and the predetermined number The second threshold is subjected to a second comparison to determine whether the ambient humidity is lower than a predetermined low humidity value; if the result of the second comparison indicates that the ambient humidity is lower than the predetermined low humidity value, the humidity compensation device sends the second control signal to The touch detection device increases the gain of the touch detection device when performing signal conversion. The control device for a touch screen according to claim 3, wherein: if the result of the second comparison indicates that the ambient humidity is higher than a predetermined low humidity value, the humidity compensation device transmits a third control signal to the touch detection device. To control the touch detection device to perform signal conversion with normal gain. The control device for a touch screen according to claim 1, wherein the humidity compensation device further comprises a humidity-gain correspondence table for storing a correspondence between the preset environmental humidity and the gain value. relationship. The touch screen control device of claim 5, wherein the humidity compensation device further comprises a message receiving module, an inquiry module and a message sending module; the message receiving module is configured to receive the humidity detecting device for transmitting The humidity detecting signal is configured to send a query instruction to the humidity-gain correspondence table according to the humidity detecting signal received by the message receiving module to query a gain value corresponding to the ambient humidity, and the humidity is - The query result returned by the gain correspondence table is transmitted to the signal sending module; the signal sending module sends a corresponding control signal to the touch detecting device according to the query result. A touch screen control method includes: receiving a touch sensing signal of a touch screen; converting the touch sensing signal into a touch operation signal to determine a touch mode and a contact coordinate; and detecting an environmental humidity to obtain a humidity detection signal; and detecting the humidity according to the humidity The signal generates a corresponding control signal; the control signal is used to adjust the gain when the touch sensing signal is converted into the touch operation signal. The method for controlling a touch screen according to claim 7 of the patent application, wherein: The method includes: first comparing the humidity detection signal with a predetermined first threshold to determine whether the ambient humidity is higher than a predetermined high humidity value; if the result of the first comparison indicates that the ambient humidity is higher than a predetermined high humidity value, A first control signal is generated to reduce the gain when converting the touch sensing signal. The method for controlling a touch screen according to claim 8 , wherein the method further comprises: if the result of the first comparison indicates that the ambient humidity is lower than a predetermined high humidity value, the humidity detection signal and the predetermined second threshold Performing a second comparison to determine whether the ambient humidity is lower than a predetermined low humidity value; if the result of the second comparison indicates that the ambient humidity is lower than the predetermined low humidity value, generating a second control signal to improve conversion of the touch sensing The gain at the time of the signal. The method for controlling a touch screen according to claim 9 , further comprising: if the result of the second comparison indicates that the ambient humidity is higher than a predetermined low humidity value, generating a third control signal to control the conversion The gain when the touch sensing signal is maintained is a normal value. The method for controlling a touch screen according to claim 7, wherein: the method further comprises: querying, according to the humidity detection signal, a gain value corresponding to the ambient humidity in a predetermined humidity-gain correspondence table; and transmitting the corresponding value according to the gain value. Control signal The gain of the touch sensing signal is adjusted by the control signal.