CN110794995A - Capacitive key display panel, method and electronic equipment - Google Patents

Capacitive key display panel, method and electronic equipment Download PDF

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Publication number
CN110794995A
CN110794995A CN201810871382.3A CN201810871382A CN110794995A CN 110794995 A CN110794995 A CN 110794995A CN 201810871382 A CN201810871382 A CN 201810871382A CN 110794995 A CN110794995 A CN 110794995A
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Prior art keywords
control chip
display
pins
capacitive
pcb
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CN201810871382.3A
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CN110794995B (en
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薛升
黄涛
李奇峰
杨云
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BYD Semiconductor Co Ltd
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BYD Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

The disclosure relates to a capacitive key display panel, a method and an electronic device, which are used for realizing independent control of a touch detection function and a display function of the capacitive key display panel under the condition of using fewer pins of an Integrated Circuit (IC). The capacitive button display panel includes: m keys, wherein M is a positive integer greater than or equal to 1; a display device including a display unit arranged in a (N-1) × N dot matrix form, the display unit arranged in the (N-1) × N dot matrix form being connected to the N input/output ports in a serial manner, wherein N is a positive integer of 2 or more; the capacitive control chip is connected with the N input/output ports through N pins respectively and is connected with the M keys through M pins respectively, and the capacitive control chip is used for driving the display device to display target data when detecting that capacitance changes exist in the M keys; wherein each of the N pins is different from each of the M pins.

Description

Capacitive key display panel, method and electronic equipment
Technical Field
The present disclosure relates to the field of electronic technologies, and in particular, to a capacitive key display panel, a method and an electronic device.
Background
The capacitive key display panel can detect touch operation on keys and correspondingly display functions and parameters corresponding to the touch operation.
In the related art, when a capacitive key display panel is designed by an IC (Integrated Circuit), there are two main ways:
in the first scheme, the IC drives the touch detection function and the display function through the same pins, and then multiplexing control of the touch detection function and the display function is realized in a time-sharing scanning IC mode. In this manner, since the IC drives the touch detection function and the display function through the same pin, when a problem occurs in driving the display function, the driving of the touch detection function may also be affected.
In the second scheme, the IC drives the touch detection function and the display function through different pins. In this manner, if the capacitive key display panel includes a large number of keys and display elements, the touch detection function and the display function may need to be driven by a large number of pins, and the circuit wiring is complicated.
Disclosure of Invention
The invention aims to provide a capacitive key display panel, a method and an electronic device, which are used for realizing independent control of a touch detection function and a display function of the capacitive key display panel under the condition of using fewer IC pins.
In a first aspect, the present disclosure provides a capacitive key display panel, comprising:
m keys, wherein M is a positive integer greater than or equal to 1;
a display device including a display part of an (N-1) × N dot matrix arrangement, the display part of the (N-1) × N dot matrix arrangement being connected to N input/output ports in a serial manner, where N is a positive integer equal to or greater than 2;
the capacitive control chip is respectively connected with the N input/output ports through N pins and respectively connected with the M keys through M pins, and is used for driving the display device to display target data when detecting that capacitance changes exist in the M keys; wherein each of the N pins is different from each of the M pins.
Optionally, the display unit is a light emitting diode, the display unit arranged in an (N-1) × N dot matrix includes N columns of (N-1) rows, wherein anodes of (N-1) display units in an X-th column are respectively connected to an X-th pin of the N pins, cathodes of the (N-1) display units in the X-th column are respectively connected to N-1 pins of the N pins except the X-th pin in a one-to-one correspondence manner, X is a positive integer greater than or equal to 1, and X is less than or equal to N.
Optionally, the M keys, the display device and the capacitive control chip are disposed on a printed circuit board PCB, and the display panel further includes:
the touch panel is arranged right above the PCB and used for receiving key operation;
the capacitance control chip detects capacitance change caused by key operation through an air layer between the PCB and the touch panel.
Optionally, a distance between the capacitive control chip and the touch panel is determined by an area of each of the M keys, a sensitivity parameter of the capacitive control chip, and dielectric constants of the PCB and the touch panel.
Optionally, when the PCB is designed in a single layer, the M keys are disposed on a bottom layer of the PCB, and a distance between the capacitive control chip and the touch panel is a distance obtained by adding a distance between a top layer of the PCB and the touch panel to a thickness of the PCB.
Optionally, when the PCB is designed in a double-layer manner, the M keys are disposed on a top layer of the PCB, and a distance between the capacitive control chip and the touch panel is a distance obtained by adding a thickness of the touch panel to a distance between the top layer of the PCB and the touch panel.
In a second aspect, the present disclosure further provides a capacitive button display method, including:
receiving key operation;
detecting capacitance change caused by the key operation through a capacitive control chip to determine a target key corresponding to the key operation in M keys, wherein the capacitive control chip is respectively connected with the M keys through M pins, and M is a positive integer greater than or equal to 1;
determining a function corresponding to the target key;
according to the function, the display device is driven by the capacitive control chip to display target data, wherein the display device comprises a display part arranged in an (N-1) xN dot matrix mode, the display part arranged in the (N-1) xN dot matrix mode is connected to N input/output ports in a serial mode, the capacitive control chip is respectively connected with the N input/output ports through N pins, each pin of the N pins is different from each pin of the M pins, and N is a positive integer greater than or equal to 2.
Optionally, receiving a key operation, comprising:
receiving key operation through a touch panel, wherein the touch panel is arranged right above a Printed Circuit Board (PCB) comprising the M keys, the display device and the capacitive control chip;
detecting a change in capacitance caused by the key operation by a capacitive control chip, comprising:
and detecting the capacitance change caused by the key operation through an air layer between the PCB and the touch panel by a capacitance control chip.
Optionally, before detecting a capacitance change caused by the key operation through a capacitive control chip, the method further includes:
and setting the distance between the capacitive control chip and the touch panel according to the area of each key in the M keys, the sensitivity parameter of the capacitive control chip and the dielectric constants of the PCB and the touch panel.
In a third aspect, the present disclosure further provides an electronic device including the capacitive key display panel according to any one of the first aspect.
Through the technical scheme, the capacitive key display panel comprises M keys, a display device and a capacitive control chip, wherein the display device comprises display parts arranged in an (N-1) xN dot matrix mode, the (N-1) xN display parts are connected to N input/output ports in a serial mode, then the capacitive control chip is respectively connected with the N input/output ports through N pins and is respectively connected with the M keys through the M pins and used for driving the display device to display target data when the capacitance change of the M keys is detected, and each pin of the N pins is different from each pin of the M pins. That is to say, the capacitive key display panel of the present disclosure can implement independent control of the key detection function and the display function, and drive (N-1) × N display components through N pins, compared with the related art that drive (N-1) × N display components through (N-1) + N pins, the technical scheme of the present disclosure uses fewer pins, greatly reduces the complexity of circuit wiring, and simultaneously, saves the pins of the capacitive control chip, so that the capacitive control chip has more pins to select when implementing other functions.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a block diagram illustrating a capacitive key display panel according to an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating the connection of a light emitting diode according to an exemplary embodiment of the present disclosure;
FIG. 3 is a diagram of a four-digit nixie tube capable of driving a display in an exemplary embodiment of the disclosure;
FIG. 4 is a circuit schematic diagram illustrating a capacitive key display panel according to an exemplary embodiment of the present disclosure;
fig. 5 is a flowchart illustrating a capacitive key display method according to an exemplary embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram illustrating a capacitive key display panel 100 according to an exemplary embodiment of the present disclosure, and referring to fig. 1, the capacitive key display panel 100 in the embodiment of the present disclosure includes:
m keys 101, wherein M is a positive integer greater than or equal to 1;
a display device 102, wherein the display device 102 includes a display unit of an (N-1) × N dot matrix arrangement, the display unit of the (N-1) × N dot matrix arrangement is connected to N input/output ports in a serial manner, N is a positive integer equal to or greater than 2;
the capacitive control chip 103 is connected with the N input/output ports through N pins respectively, and is connected with the M keys 101 through M pins respectively, and is configured to drive the display device 102 to display target data when detecting that capacitance changes exist in the M keys 101; wherein each of the N pins is different from each of the M pins.
Each of the M keys 101 may be a capacitive touch key, that is, a touch key operation may be determined by detecting a capacitance change of the key, and the M keys 101 are connected to the M pins of the capacitive control chip 103 in a one-to-one correspondence manner, so that the capacitive control chip 103 may detect a capacitance change existing in the M keys 101 when the touch key operation occurs, and thereby determine a target key corresponding to the touch key operation, that is, determine a target key pressed in the M keys.
The display device 102 includes (N-1) × N display parts, which may be light emitting diodes, etc., and the present disclosure is not limited thereto. In addition, the (N-1) × N display units are arranged in a dot matrix and connected to N input/output ports in a serial manner, so that the capacitive control chip 103 can be connected to the (N-1) × N display units included in the display device 102 through N pins, respectively, to realize independent control of each display unit in the display device 102, thereby realizing driving of the display device 102 to display target data when it is detected that there is a capacitance change in the M keys.
In the serial manner, when the (N-1) × N display elements are arranged in a dot matrix, one end of the (N-1) display elements in each column is connected to the same input/output port, that is, the (N-1) display elements in each column are connected in a serial manner.
Optionally, in this embodiment of the present disclosure, the display components arranged in the (N-1) × N dot matrix array include N columns of (N-1) rows, where positive electrodes of (N-1) display components in an X-th column are respectively connected to an X-th pin of the N pins, negative electrodes of the (N-1) display components in the X-th column are respectively connected to N-1 pins of the N pins except the X-th pin in a one-to-one correspondence manner, X is a positive integer greater than or equal to 1, and X is less than or equal to N.
For example, referring to fig. 2, 42 LEDs in fig. 2 are arranged in a 6 × 7 dot matrix, have 6 rows and 7 columns, and are connected to 7 input/output ports in a serial manner, and are respectively connected to 7 pins, i.e., the LED0 through the LED6, of the capacitive control chip 103 in a one-to-one correspondence.
Specifically, anodes of 6 light emitting diodes in the first row are respectively connected to a first pin LED0 of 7 pins of the capacitive control chip 103, cathodes of the 6 light emitting diodes in the first row are respectively connected to 6 pins LEDs 1 to LEDs 6 of the 7 pins except for the first pin LED0 in a one-to-one correspondence manner, similarly, anodes of 6 light emitting diodes in the second row are respectively connected to a second pin LED1 of the 7 pins of the capacitive control chip 103, and cathodes of the 6 light emitting diodes in the 7 pins except for the second pin LED1 are respectively connected to 6 pins LEDs 0 and LEDs 2 to LEDs 6 in a one-to-one correspondence manner, and so on.
It should be noted that, in fig. 2, the numeral symbol of the cathode of the led indicates the number of the led for distinguishing the led from other leds, and the symbol of the anode of the led indicates the corresponding segment in the nixie tube controlled by the led, for example, referring to fig. 2 and 3, if the four-digit nixie tube shown in fig. 3 is controlled by the circuit connection manner shown in fig. 2, and the symbol of the anode of the led0 in fig. 2 is "a 1", it indicates that the led controls the segment a1 in the nixie tube shown in fig. 3, and so on.
Because the anode and the cathode of each led are respectively connected to two different pins of the capacitive control chip 103 according to the above connection manner, each led can be independently controlled by controlling the level input to the corresponding pin of the capacitive control chip 103, so as to drive the display device 102 to display the target data.
The driving method of the display device 102 in the embodiment of the present disclosure is described in detail below.
In the embodiment of the present disclosure, the display device 102 may be driven to display the target data in a software simulation manner by using the three states of the pins of the capacitive control chip 103, where the three states are: high level, low level and high resistance state. When one light-emitting diode is expected to be turned on, the input/output port connected with the anode of the light-emitting diode can be set to be at a high level through software, the input/output port connected with the cathode of the light-emitting diode is set to be at a low level, and the input/output ports of the anodes and the cathodes of the rest of the light-emitting diodes are set to be at a low level or a high resistance state, so that only 1 light-emitting diode can be turned on in a unit time, and the on-off of each light-emitting diode can be independently controlled.
It should be noted that one implementation manner of software simulation may be: the time T0 for each LED to be turned on is provided by a timer in the capacitive touch chip, the timer is interrupted every T0 time, and the on-off state of each LED is configured in sequence during the interruption. When one round of setting is finished, namely all the light emitting diodes in the display device are driven by scanning, the software is cleared to zero, and the configuration is started from the first light emitting diode again
For example, referring to fig. 2, it is required to control to light the LED0, and the anode of the LED0 is connected to the LED0 pin of the capacitive control chip, and the cathode is connected to the LED1 pin, so that the level input to the LED0 pin is controlled to be high level, and the level input to the LED1 pin is controlled to be low level, so that the LED0 can be lighted.
When the display is started to be driven at the time T, assuming that the control time of each light emitting diode is T0, and the light emitting diode 0 needs to be turned on at the time T, and the anode of the light emitting diode 0 is connected to the pin LED0 of the capacitive control chip, and the cathode of the light emitting diode 0 is connected to the pin LED1, the level input to the pin LED0 can be controlled to be high, and the level input to the pin LED1 is controlled to be low, so that the light emitting diode 0 can be turned on. Meanwhile, all the pins of the LED2, the LED3, the LED4, the LED5 and the LED6 are set to be in a high-resistance state, so that the LEDs except the LED0 are not turned on at the moment T.
Then, the light emitting diode 1 needs to be turned on at the time of T + T0, then pins of all the LEDs 0 to 6 for driving display are set to be in a high-resistance state, then the pin of the LED0 is set to be in a high level, the pin of the LED2 is set to be in a low level, and simultaneously, pins of the LEDs 1, the pins of the LEDs 3, the pins of the LEDs 4, the pins of the LEDs 5 and the pins of the LEDs 6 are all set to be in a high-resistance state, so that the light emitting diodes except the light emitting diode 1 are not turned on. The light emitting diode 2 needs to be turned on at the time of T +2T0, then pins of all LEDs 0 to 6 for driving display are set to be in a high-impedance state, then the pin of LED0 is set to be in a high level, the pin of LED3 is set to be in a low level, and simultaneously, pins of LEDs 1, LED2, LED4, LED5 and LED6 are all set to be in a high-impedance state, so that the light emitting diodes except the light emitting diode 2 are not turned on at the time of T, and so on, when T +42T0, all the light emitting diodes finish scanning, and the next round of driving scanning is executed from the light emitting diode 0 again.
It should be noted that, in the above example, the time length of T0 may be changed by a software program according to the user's requirement for the brightness of the led, for example, T0 may be set to be larger if the brightness of the led is required to be higher. However, it should be understood that in the embodiment of the present disclosure, T0 should not be less than 0.02 second according to the human eye visual retention time, otherwise, the target data seen by the user is not the displayed target data, but only the light emitting diode is controlled to be lit at a single time.
According to the above manner, each of the light emitting diodes arranged in the (N-1) × N dot matrix can be independently controlled by the N pins of the capacitive control chip 103, so as to drive the display device 102 to display target data, compared with the related art in which the display function is driven by the (N-1) + N pins, i.e., (2N +1) pins, the scheme of the embodiment of the present disclosure greatly reduces the number of pins used, and reduces the complexity of circuit wiring.
It should be understood that, in the embodiment of the present disclosure, if the display parts to be controlled cannot be arranged in the (N-1) × N lattice form, the (N-1) × N lattice form arrangement closest to the number of display parts to be controlled may be selected to form the display device 102. For example, if there are 10 display units to be controlled, 12 display units arranged in a 3 × 4 dot matrix may be selected to form the display device 102.
Of course, the display device 102 may be formed by selecting 36 display elements in a 6 × 7 matrix array, that is, by reducing 5 columns to a 6 × 2 matrix array in addition to the 6 × 7 matrix array. That is, in the embodiment of the present disclosure, when the display elements to be controlled cannot be arranged in the (N-1) × N dot matrix, a larger (N-1) × N dot matrix arrangement may be selected, which is not limited by the present disclosure as long as the total number of display elements in the (N-1) × N dot matrix arrangement is greater than or equal to the number of display elements to be controlled, and each display element satisfies the above-described connection manner.
Alternatively, the M keys 101, the display device 102 and the capacitive control chip 103 are disposed on a printed circuit board PCB, and the display panel 100 further includes a touch panel disposed directly above the PCB for receiving key operations, so that the capacitive control chip 103 detects capacitance changes caused by the key operations through an air layer between the PCB and the touch panel.
The touch panel may be made of an insulating material, for example, glass or plastic, etc., and the disclosure is not limited thereto. Meanwhile, the shape of the touch panel is not limited in the present disclosure, as long as the capacitive control chip 103 can detect the capacitance change of the corresponding key when the user touches the touch panel.
In the embodiment of the present disclosure, the capacitive control chip 103 is a high-precision (16-bit resolution) capacitive touch chip, for example, a capacitive touch chip with a model number of BF7612AM20, and the like, which is not limited in the present disclosure.
The capacitive control chip 103 detects a capacitance change caused by a key operation through an air layer between the PCB and the touch panel, and if the distance between the capacitive control chip 103 and the touch panel is large, the capacitive control chip 103 may not detect the capacitance change caused by the key operation, and the distance between the capacitive control chip 103 and the touch panel is a key factor in the embodiment of the disclosure.
Optionally, the distance between the capacitive control chip and the touch panel is determined by the area of each of the M keys, the sensitivity parameter of the capacitive control chip, and the dielectric constants of the PCB and the touch panel.
For example, in a general case, the distance between the capacitive control chip and the touch panel may be determined to be 9mm to 15mm, preferably 10mm, according to the area of each of the M keys, the sensitivity parameter of the capacitive control chip, and the dielectric constants of the PCB and the touch panel.
Of course, if the area of each of the M keys is large and the sensitivity of the capacitive control chip is high, that is, the capacitive control chip is a high-precision capacitive control chip, and the dielectric constant of the PCB and the touch panel is large, the distance between the capacitive control chip and the touch panel may also be set to 20mm, and the specific distance between the capacitive control chip and the touch panel is not limited in the disclosure.
In the above manner, the capacitive control chip 103 can detect the capacitance change of the key caused by the key operation through the air layer without using a middle contact element such as a spring or an ITO (Indium tin oxide) film in the related art to realize the direct contact between the key and the touch panel, thereby greatly reducing the manufacturing cost and the assembly difficulty of the capacitive key display panel.
For the above-mentioned PCB integrating the M keys 101, the display device 102 and the capacitive control chip 103, the design manner is different, the arrangement positions of the M keys 101 on the PCB are different, and the distance between the capacitive control chip 103 and the touch panel is also different, which will be further described below.
Optionally, when the PCB is designed in a single layer, the M keys 101 are disposed at a bottom layer of the PCB, and a distance between the capacitive control chip 103 and the touch panel is a distance obtained by adding a distance between a top layer of the PCB and the touch panel and a thickness of the touch panel to the thickness of the PCB.
Optionally, when the PCB is designed in a double-layer manner, the M keys are disposed on a top layer of the PCB, and a distance between the capacitive control chip and the touch panel is a distance obtained by adding a thickness of the touch panel to a distance between the top layer of the PCB and the touch panel.
It should be noted that, in the embodiment of the present disclosure, one surface of the PCB directly facing the touch panel is a top layer of the PCB, and one surface of the PCB back to the touch panel is a bottom layer of the PCB, when the PCB adopts a single-layer design, the capacitive control chip 103 is usually disposed on the bottom layer of the PCB, which is convenient for the capacitive control chip 103 to perform wiring and placing components when implementing other functions, and due to the single-layer design, the M keys 101 can only be disposed on the bottom layer of the PCB.
The capacitive keypad display of the present disclosure is described below in a complete embodiment.
Referring to fig. 4, the keys K1-K7 are seven keys, and the key 201 is a capacitive control chip, which can detect the capacitance change of the seven keys K1-K7 and drive the display device 202 to display the target data.
202 is a four-bit nixie tube, since one bit of the nixie tube is composed of eight light emitting diodes, the four-bit nixie tube includes 32 light emitting diodes, if a spacer for spacing the first two bits and the last two bits of the nixie tube is added, the four-bit nixie tube includes 34 light emitting diodes in total, that is, if 34 light emitting diodes need to be controlled, then 42 light emitting diodes arranged in a 6 × 7 dot matrix closest to the 34 light emitting diodes can be selected to form the display device.
It should be understood that 34 of the 42 leds are leds corresponding to a four-digit nixie tube, and the remaining 8 leds can be used as indicator lights according to the user's requirements, for indicating the fault information of the capacitive key display panel, etc., and the function of the remaining 8 leds is not limited by the present disclosure.
According to the mode shown in fig. 4, the four-digit nixie tube 202 is connected to the PB 0-PB 6 pins (i.e., the LED 0-LED 6 pins) of the capacitive control chip 201 through seven input/output ports 0-7 in a one-to-one correspondence manner, and the K1-K7 keys are connected to the PC1 pin and the PD 2-PD 7 pins of the capacitive control chip 201 in a one-to-one correspondence manner, so that the capacitive control chip 201 can independently control the display function and the key detection function through different pins, and the key detection function and the display function are not affected by each other.
In addition, 203 is a power filter circuit for filtering out interference and ripple in the power supply. 204 is a data input/output filter circuit for filtering out interference and ripples of RXD and TXD pins of the capacitive control chip 201. 205 is an indicator light, which can be used to indicate the usage of the capacitive key chip LED 0-LED 7 pins, etc., and the disclosure is not limited thereto. 206 is a buzzer circuit of the display panel, and the buzzer circuit 206 may emit a warning sound according to a user operation to warn the user of an erroneous operation. The circuit principles and specific connection structures of the above-mentioned circuits 203, 204, 205 and 206 are the same as those in the related art, and the detailed description of the disclosure is omitted here.
Based on the same inventive concept, referring to fig. 5, the present disclosure further provides a capacitive key display method, including the steps of:
step S401, receiving key operation;
step S402, detecting capacitance change caused by the key operation through a capacitive control chip to determine a target key corresponding to the key operation in M keys, wherein the capacitive control chip is respectively connected with the M keys through M pins, and M is a positive integer greater than or equal to 1;
step S403, determining a function corresponding to the target key;
step S404, according to the function, a display device is driven by the capacitive control chip to display target data, wherein the display device comprises a display component arranged in an (N-1) xN dot matrix manner, the display component arranged in the (N-1) xN dot matrix manner is connected to N input/output ports in a serial manner, the capacitive control chip is respectively connected with the N input/output ports through N pins, each pin of the N pins is different from each pin of the M pins, and N is a positive integer greater than or equal to 2.
Optionally, receiving a key operation, comprising:
receiving key operation through a touch panel, wherein the touch panel is arranged right above a Printed Circuit Board (PCB) comprising the M keys, the display device and the capacitive control chip, and touch detection areas of the touch panel correspond to the positions of the M keys on the PCB one by one;
detecting a change in capacitance caused by the key operation by a capacitive control chip, comprising:
and detecting the capacitance change caused by the key operation through an air layer between the PCB and the touch panel by a capacitance control chip.
Optionally, before detecting a capacitance change caused by the key operation through a capacitive control chip, the method further includes:
and setting the distance between the capacitive control chip and the touch panel according to the area of each key in the M keys, the sensitivity parameter of the capacitive control chip and the dielectric constants of the PCB and the touch panel.
Based on the same inventive concept, the present disclosure further provides an electronic device including any one of the above capacitive key display panels.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A capacitive key display panel, comprising:
m keys, wherein M is a positive integer greater than or equal to 1;
a display device including a display part of an (N-1) × N dot matrix arrangement, the display part of the (N-1) × N dot matrix arrangement being connected to N input/output ports in a serial manner, where N is a positive integer equal to or greater than 2;
the capacitive control chip is respectively connected with the N input/output ports through N pins and respectively connected with the M keys through M pins, and is used for driving the display device to display target data when detecting that capacitance changes exist in the M keys; wherein each of the N pins is different from each of the M pins.
2. The display panel according to claim 1, wherein the display elements are light emitting diodes, the display elements in the (N-1) × N dot matrix arrangement include N columns and (N-1) rows, wherein positive electrodes of (N-1) display elements in an X-th column are respectively connected to an X-th pin of the N pins, negative electrodes are respectively connected to N-1 pins of the N pins except the X-th pin in a one-to-one correspondence, X is a positive integer equal to or greater than 1, and X is equal to or less than N.
3. The display panel of claim 1, wherein the M keys, the display device and the capacitive control chip are disposed on a printed circuit board PCB, the display panel further comprising:
the touch panel is arranged right above the PCB and used for receiving key operation;
the capacitance control chip detects capacitance change caused by key operation through an air layer between the PCB and the touch panel.
4. The display panel of claim 3, wherein a distance between the capacitive control chip and the touch panel is determined by an area of each of the M keys, a sensitivity parameter of the capacitive control chip, and dielectric constants of the PCB and the touch panel.
5. The display panel of claim 4, wherein when the PCB is a single layer design, the M keys are disposed on a bottom layer of the PCB, and a distance between the capacitive control chip and the touch panel is a distance obtained by adding a distance between a top layer of the PCB and the touch panel and a thickness of the touch panel to a thickness of the PCB.
6. The display panel of claim 4, wherein when the PCB is a dual-layer design, the M buttons are disposed on a top layer of the PCB, and a distance between the capacitive control chip and the touch panel is a distance obtained by adding a thickness of the touch panel to a distance between the top layer of the PCB and the touch panel.
7. A capacitive button display method, the method comprising:
receiving key operation;
detecting capacitance change caused by the key operation through a capacitive control chip to determine a target key corresponding to the key operation in M keys, wherein the capacitive control chip is respectively connected with the M keys through M pins, and M is a positive integer greater than or equal to 1;
determining a function corresponding to the target key;
according to the function, the display device is driven by the capacitive control chip to display target data, wherein the display device comprises a display part arranged in an (N-1) xN dot matrix mode, the display part arranged in the (N-1) xN dot matrix mode is connected to N input/output ports in a serial mode, the capacitive control chip is respectively connected with the N input/output ports through N pins, each pin of the N pins is different from each pin of the M pins, and N is a positive integer greater than or equal to 2.
8. The method of claim 7, wherein receiving a key operation comprises:
receiving key operation through a touch panel, wherein the touch panel is arranged right above a Printed Circuit Board (PCB) comprising the M keys, the display device and the capacitive control chip;
detecting a change in capacitance caused by the key operation by a capacitive control chip, comprising:
and detecting the capacitance change caused by the key operation through an air layer between the PCB and the touch panel by a capacitance control chip.
9. The method of claim 8, further comprising, prior to detecting a change in capacitance caused by the key operation by a capacitive control chip:
and setting the distance between the capacitive control chip and the touch panel according to the area of each key in the M keys, the sensitivity parameter of the capacitive control chip and the dielectric constants of the PCB and the touch panel.
10. An electronic device comprising the capacitive key display panel according to any one of claims 1 to 6.
CN201810871382.3A 2018-08-02 2018-08-02 Capacitive key display panel, method and electronic equipment Active CN110794995B (en)

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