CN106656143B - Touch and display driving module and method for eliminating influence of LED on touch key when touch key and LED are shared - Google Patents
Touch and display driving module and method for eliminating influence of LED on touch key when touch key and LED are shared Download PDFInfo
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Abstract
The invention provides a touch and display driving module and a method for eliminating the influence of an LED on a touch key when the touch key is shared with the LED. Wherein the LED has a first pin and a second pin. The method comprises the following steps: coupling the first pin of the LED with the pin of the touch key, and multiplexing in a time-sharing manner; in a first time period, enabling the first pin and the second pin to output the acquired waveform of the touch key, so that when the circuit is in a touch key mode, the touch key is not influenced by the parasitic capacitance of the LED; and in a second time period, the first pin and the second pin are respectively coupled with two ends of the LED driving circuit, so that the circuit is in an LED display driving mode.
Description
Technical Field
The invention relates to the field of touch keys and display driving.
Background
In recent years, with the development of touch technologies, especially capacitive touch technologies, capacitive touch key applications have rapidly increased, and are widely used in various aspects such as household appliances, audio and video equipment, computer peripherals, automobile dashboards and the like instead of mechanical keys.
With the increasing competition of application environments and competitive costs, higher and higher requirements are placed on the integration of PCBs and the functionality of ICs. It is desirable to reduce the BOM cost and the pin count of the IC as much as possible without affecting the key performance. The capacitive touch key is sensitive to the change of a tiny equivalent capacitance, so that the touch key is influenced by the LED when the touch key and the LED are shared, and unstable interference can be caused to the touch key. When the interference is too large, the key can not be distinguished normally.
Therefore, there is a need for an apparatus and method for eliminating the influence of the LED on the touch key when the touch key is used together with the LED.
Disclosure of Invention
In order to eliminate the influence of the LED on the touch key when the touch key is shared with the LED, the invention provides a touch and display driving module and a method.
The touch and display driving module includes: the LED touch screen comprises an LED driving circuit (101), a key compensation circuit (102), a touch key circuit (103), a first Pin Pin1(106) and a second Pin Pin2 (107);
the first Pin Pin1(106) is used as both a touch key Pin and one of two driving pins of the LED, and the first Pin Pin1(106) adopts time division multiplexing to realize the sharing of the touch key Pin and the LED driving Pin;
the second Pin Pin2(107) is the other Pin of the two-end driving pins of the LED;
the touch key circuit (103) is provided with an output end, and the output end of the touch key circuit (103) can be coupled with the touch key and the medium (108) through a first Pin Pin1(106) and is used for outputting the collected touch key information;
the voltage waveform of the output end of the key compensation circuit (102) is consistent with the voltage waveform of the output end of the touch key circuit;
in a first time period, the first Pin Pin1(106) is connected with the output end of the touch key circuit (103), the second Pin Pin2(107) is connected with the output end of the key compensation circuit (102), so that the output waveforms of the first Pin Pin1(106) and the second Pin Pin2(107) are the same, and at the moment, the touch and display driving module is in a touch key mode;
in a second time period, the first Pin1(106) and the second Pin2(107) are respectively connected to two ends of the LED driving circuit, and at this time, the touch and display driving module is in an LED display driving mode.
In one embodiment, the first time period and the second time period evolve alternately.
In one embodiment, the key compensation circuit (102) has an input and the output, the voltage waveforms of the input and the output of the key compensation circuit (102) are identical, the input of the key compensation circuit (102) is coupled with the output of the touch key circuit (103) so that the voltage waveform of the input of the key compensation circuit (102) is identical with the voltage waveform of the output of the touch key circuit (103).
In one embodiment, the key compensation circuit (102) is a voltage follower circuit.
In one embodiment, the touch and display driving module further includes a first switch K1(104) and a second switch K2(105), one end of the first switch being connected to the first pin, one end of the second switch being connected to the second pin;
during the first time period, the other end of the first switch K1(104) is coupled to the output end of the touch key circuit (103), and the other end of the second switch K2(105) is coupled to the output end of the key compensation circuit (102).
During the second period, the other end of the first switch K1(104) and the other end of the second switch K2(105) are coupled to the first end and the second end of the LED driving circuit (101), respectively.
In one embodiment, the touch keys are capacitive touch keys.
The invention also provides a method for eliminating the influence of the LED on the touch key when the touch key and the LED are shared, wherein the LED is provided with a first pin and a second pin, and the method is characterized by comprising the following steps:
coupling the first pin of the LED with the pin of the touch key, and multiplexing in a time-sharing manner;
in a first time period, enabling the first pin and the second pin to output the acquired waveform of the touch key, so that when the circuit is in a touch key mode, the touch key is not influenced by the parasitic capacitance of the LED;
and in a second time period, the first pin and the second pin are respectively coupled with two ends of the LED driving circuit, so that the circuit is in an LED display driving mode.
In one embodiment, the method further comprises alternating the first time period and the second time period.
In one embodiment, the touch keys are capacitive touch keys.
Drawings
The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the appended drawings. It is to be noted that the appended drawings are intended as examples of the claimed invention. In the drawings, like reference characters designate the same or similar elements.
FIG. 1 illustrates a touch and display driver module according to an embodiment of the invention;
fig. 2 illustrates a timing diagram of the first Pin1(106) and the second Pin2(107) according to an embodiment of the present invention;
FIG. 3 shows a key compensation circuit according to an embodiment of the invention.
Description of the reference numerals
101 LED drive circuit
102 key compensation circuit
103 touch key circuit
104 first switch K1
105 second switch K2
106 first Pin1
107 second Pin Pin2
108 touch key and medium
T1 first time period
T2 second time period
Detailed Description
The detailed features and advantages of the present invention are described in detail in the detailed description which follows, and will be sufficient for anyone skilled in the art to understand the technical content of the present invention and to implement the present invention, and the related objects and advantages of the present invention will be easily understood by those skilled in the art from the description, claims and drawings disclosed in the present specification.
With the increasing competition of application environments and competitive costs, higher and higher requirements are placed on the integration of PCBs and the functionality of ICs. It is desirable to reduce the BOM cost and the pin count of the IC as much as possible without affecting the key performance. To reduce the pin count of the LED and capacitive touch keys, one of the two pins of the LED may be connected to a pin of the touch key, such as pin1 in fig. 1. The capacitive touch key is very sensitive to the change of a tiny equivalent capacitance, and due to the fact that the pin is shared, the parasitic capacitance of the LED can affect the capacitive touch key, and therefore unstable interference can be caused to the capacitive touch key. When the interference is too large, the key can not be distinguished normally.
FIG. 1 illustrates a touch and display driver module according to an embodiment of the invention. The touch and display driving module includes: the LED touch screen comprises an LED driving circuit (101), a key compensation circuit (102), a touch key circuit (103), a first switch K1(104), a second switch K2(105), a first Pin Pin1(106) and a second Pin Pin2 (107).
To save cost, the first Pin1(106) serves as both a touch key Pin and one of two driving pins of an LED (e.g., a positive Pin of the LED). The first Pin1(106) is time division multiplexed to realize sharing of the touch key Pin and the LED driving Pin, so the first Pin1(106) is also called a shared Pin. The first Pin1(106) is coupled to the first switch K1 (104).
The second Pin2(107) is the other of the two-terminal drive pins of the LED. The second Pin2(107) is coupled to the second switch K2 (105).
An LED driver circuit (101) is for driving an LED, wherein the LED driver circuit has a first terminal and a second terminal.
And the touch key circuit (103) is provided with an output end and is used for outputting the collected touch key information, wherein the touch key circuit (103) can be coupled with the touch key and the medium (108) through the first switch K1(104) and the first Pin Pin1 (106).
A key compensation circuit (102) for reducing or eliminating the effect of the LED on the acquisition of the capacitive touch keys, wherein the key compensation circuit (102) has an input and an output. The output end of the key compensation circuit (102) can be coupled to one end of the LED through the second switch K2(105) and the second Pin Pin2 (107). The key compensation circuit (102) is designed to output the same waveform as the touch key circuit (103) at two ends of the shared LED when a touch key is acquired. If the two ends of the LED output the same waveform, the two ends of the parasitic capacitor of the LED have the same voltage, the parasitic capacitor cannot influence the capacitor of the touch key, and the influence of the LED on the acquisition of the touch key is eliminated.
Since the first Pin1(106) of the present invention is a common Pin for the touch key and the LED display driver, the touch and display driver module needs to be alternately in the touch key mode and the display driver mode.
During the first time period (period T1), the touch and display driving module is in the touch key mode. The first switch K1(104) is connected to the output of the touch key circuit (103), and the second switch K2(105) is connected to the output of the key compensation circuit (102). The input end of the touch key circuit (103) is coupled with the output end of the touch key circuit and used for collecting output voltage of the touch key circuit, and the waveform of the output end of the touch key circuit (103) is kept consistent with that of the input end, so that the waveform of the output end of the key compensation circuit (102) is consistent with that of the output end of the touch key circuit (103). From this, it is understood that the voltage waveforms at both ends of the LED are uniform. This has the advantage that the parasitic capacitance of the LED does not have any effect on the touch key and the dielectric (108).
During a second time period (period T2), the touch and display driving module is in the display driving mode. The first switch K1(104) and the second switch K2(105) are respectively connected to the first terminal and the second terminal of the LED driving circuit.
Fig. 2 illustrates a timing diagram of the first Pin1(106) and the second Pin2(107) according to an embodiment of the present invention. Referring to fig. 1, in the first period (stage T1), the first Pin1(106) is used as a Pin of the touch key, the first Pin1(106) outputs a waveform captured by the touch key, and the first switch K1(104) and the second switch K2(105) of the touch and display driving module are turned to B. In the second period (stage T2), the first Pin1(106) outputs the driving waveform of the LED, and the first switch K1(104) and the second switch K2(105) of the touch and display driving module are turned on a.
FIG. 3 shows a key compensation circuit according to an embodiment of the invention. In one embodiment, the key compensation circuit may be a voltage follower circuit (as shown in fig. 3) or may be another circuit logic, which aims to make both ends of the LED output the same waveform during the phase of collecting the capacitive touch key (T1 phase), so as to eliminate the influence of the LED on collecting the touch key.
The invention provides a touch and display driving module for eliminating the influence of an LED on a touch key when the touch key and the LED are shared, which is characterized by comprising:
the LED touch screen comprises an LED driving circuit (101), a key compensation circuit (102), a touch key circuit (103), a first Pin Pin1(106) and a second Pin Pin2 (107);
the first Pin Pin1(106) is used as both a touch key Pin and one of two driving pins of the LED, and the first Pin Pin1(106) adopts time division multiplexing to realize the sharing of the touch key Pin and the LED driving Pin;
the second Pin Pin2(107) is the other Pin of the two-end driving pins of the LED;
the touch key circuit (103) is provided with an output end, and the output end of the touch key circuit (103) can be coupled with the touch key and the medium (108) through a first Pin Pin1(106) and is used for outputting the collected touch key information;
the voltage waveform of the output end of the key compensation circuit (102) is consistent with the voltage waveform of the output end of the touch key circuit;
in a first time period, the first Pin Pin1(106) is connected with the output end of the touch key circuit (103), the second Pin Pin2(107) is connected with the output end of the key compensation circuit (102), so that the output waveforms of the first Pin Pin1(106) and the second Pin Pin2(107) are the same, and at the moment, the touch and display driving module is in a touch key mode;
in a second time period, the first Pin1(106) and the second Pin2(107) are respectively connected to two ends of the LED driving circuit, and at this time, the touch and display driving module is in an LED display driving mode.
In one embodiment, the first time period and the second time period evolve alternately.
In one embodiment, the key compensation circuit (102) has an input and the output, the voltage waveforms of the input and the output of the key compensation circuit (102) are identical, the input of the key compensation circuit (102) is coupled with the output of the touch key circuit (103) so that the voltage waveform of the input of the key compensation circuit (102) is identical with the voltage waveform of the output of the touch key circuit (103).
In one embodiment, the key compensation circuit (102) is a voltage follower circuit.
In one embodiment, the touch and display driving module further includes a first switch K1(104) and a second switch K2(105), one end of the first switch being connected to the first pin, one end of the second switch being connected to the second pin;
during the first time period, the other end of the first switch K1(104) is coupled to the output end of the touch key circuit (103), and the other end of the second switch K2(105) is coupled to the output end of the key compensation circuit (102).
During the second period, the other end of the first switch K1(104) and the other end of the second switch K2(105) are coupled to the first end and the second end of the LED driving circuit (101), respectively.
In one embodiment, the touch keys are capacitive touch keys.
The invention also provides a method for eliminating the influence of the LED on the touch key when the touch key and the LED are shared, wherein the LED is provided with a first pin and a second pin, and the method is characterized by comprising the following steps:
coupling the first pin of the LED with the pin of the touch key, and multiplexing in a time-sharing manner;
in a first time period, enabling the first pin and the second pin to output the acquired waveform of the touch key, so that when the circuit is in a touch key mode, the touch key is not influenced by the parasitic capacitance of the LED;
and in a second time period, the first pin and the second pin are respectively coupled with two ends of the LED driving circuit, so that the circuit is in an LED display driving mode.
In one embodiment, the first time period and the second time period alternate.
In one embodiment, the touch keys are capacitive touch keys.
The terms and expressions which have been employed herein are used as terms of description and not of limitation. The use of such terms and expressions is not intended to exclude any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications may be made within the scope of the claims. Other modifications, variations, and alternatives are also possible. Accordingly, the claims should be looked to in order to cover all such equivalents.
Also, it should be noted that although the present invention has been described with reference to the current specific embodiments, it should be understood by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes or substitutions may be made without departing from the spirit of the present invention, and therefore, it is intended that all changes and modifications to the above embodiments be included within the scope of the claims of the present application.
Claims (9)
1. A touch and display driver module for eliminating the influence of LEDs on touch keys when the touch keys are shared by the LEDs, the touch and display driver module comprising:
the LED touch screen comprises an LED driving circuit (101), a key compensation circuit (102), a touch key circuit (103), a first Pin Pin1(106) and a second Pin Pin2 (107);
the first Pin Pin1(106) is used as both a touch key Pin and one of two driving pins of the LED, and the first Pin Pin1(106) adopts time division multiplexing to realize the sharing of the touch key Pin and the LED driving Pin;
the second Pin Pin2(107) is the other Pin of the two-end driving pins of the LED;
the touch key circuit (103) is provided with an output end, and the output end of the touch key circuit (103) can be coupled with the touch key and the medium (108) through a first Pin Pin1(106) and is used for outputting the collected touch key information;
the voltage waveform of the output end of the key compensation circuit (102) is consistent with the voltage waveform of the output end of the touch key circuit;
in a first time period, the first Pin Pin1(106) is connected with the output end of the touch key circuit (103), the second Pin Pin2(107) is connected with the output end of the key compensation circuit (102), so that the output waveforms of the first Pin Pin1(106) and the second Pin Pin2(107) are the same, and at the moment, the touch and display driving module is in a touch key mode;
in a second time period, the first Pin1(106) and the second Pin2(107) are respectively connected to two ends of the LED driving circuit, and at this time, the touch and display driving module is in an LED display driving mode.
2. The touch and display driver module of claim 1, wherein the first time period and the second time period alternate when the touch key is shared with the LED to eliminate the effect of the LED on the touch key.
3. The touch and display driver module for eliminating the effect of LEDs on a touch key when the touch key is shared by LEDs according to claim 1, wherein the key compensation circuit (102) has an input and the output, the voltage waveforms of the input and the output of the key compensation circuit (102) are identical, the input of the key compensation circuit (102) is coupled to the output of the touch key circuit (103) such that the input of the key compensation circuit (102) is identical to the voltage waveform of the output of the touch key circuit (103).
4. The touch and display driver module for eliminating the effect of LEDs on a touch key when the touch key is shared with the LEDs of claim 3, wherein the key compensation circuit (102) is a voltage follower circuit.
5. The touch and display driving module for eliminating an influence of an LED on a touch key when the touch key is used in common with the LED of claim 1, further comprising a first switch K1(104) and a second switch K2(105), one end of the first switch being connected to the first pin, one end of the second switch being connected to the second pin;
during the first time period, the other end of the first switch K1(104) is coupled to the output end of the touch key circuit (103), and the other end of the second switch K2(105) is coupled to the output end of the key compensation circuit (102);
during the second period, the other end of the first switch K1(104) and the other end of the second switch K2(105) are coupled to the first end and the second end of the LED driving circuit (101), respectively.
6. The touch and display driver module for eliminating the effect of the LED on the touch key when the touch key is shared with the LED according to claim 1, wherein the touch key is a capacitive touch key.
7. A method for eliminating an LED effect on a touch key when the touch key is shared by the LED, wherein the LED has a first pin and a second pin, the method comprising:
coupling the first pin of the LED with the pin of the touch key, and multiplexing in a time-sharing manner;
in a first time period, enabling the first pin and the second pin to output the acquired waveform of the touch key, so that when the circuit is in a touch key mode, the touch key is not influenced by the parasitic capacitance of the LED; and
and in a second time period, the first pin and the second pin are respectively coupled with two ends of the LED driving circuit, so that the circuit is in an LED display driving mode.
8. The method of claim 7, wherein the first time period and the second time period alternate when the touch key is shared with the LED for eliminating the effect of the LED on the touch key.
9. The method for eliminating the influence of the LED on the touch key when the touch key is shared by the LED according to claim 7, wherein the touch key is a capacitive touch key.
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| CN201610933859.7A CN106656143B (en) | 2016-10-31 | 2016-10-31 | Touch and display driving module and method for eliminating influence of LED on touch key when touch key and LED are shared |
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| CN108617051B (en) * | 2018-05-09 | 2020-04-07 | 新茂国际科技股份有限公司 | Touch sensing and LED control circuit for capacitive touch screen |
| CN110187784B (en) * | 2019-06-06 | 2020-06-23 | 珠海普林芯驰科技有限公司 | LED driving and touch sensing module, LED driving and touch sensing method and computer readable storage medium |
| CN112562578A (en) * | 2020-12-08 | 2021-03-26 | 苏州健微工业技术有限公司 | LED and LCD display driving circuit supporting integrated touch key function |
| CN113054982B (en) * | 2021-03-25 | 2022-04-12 | 深圳前海维晟智能技术有限公司 | Capacitive touch key circuit with LED display device multiplexing control pin |
| CN114679165B (en) * | 2022-05-30 | 2022-09-13 | 深圳贝特莱电子科技股份有限公司 | Touch key module and suspended touch key device |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A touch and display driving module and method for eliminating the influence of LED on touch buttons when shared with LED Granted publication date: 20200424 Pledgee: Luwan Sub branch of Bank of Shanghai Co.,Ltd. Pledgor: SINO WEALTH MICROELECTRONICS Co.,Ltd. Registration number: Y2024310000766 |