Intelligent panel key backlight control system

Abstract

The utility model relates to the technical field of intelligent panels, and provides an intelligent panel key backlight control system, which comprises a backlight switching device, a key backlight switching master control device, a key operation device and a backlight master control chip, the backlight switching device comprises a key switch-on indicating lamp module, a key switch-off indicating lamp module, a lamp power supply, a first on-off module, a second on-off module and a shunt resistor, the key backlight switch-off master control device comprises a third on-off module and a master control point. And a key signal IO pin of the backlight main control chip is connected with the key operation device. The beneficial effects of the utility model are that the number of IO pins of the backlight main control chip occupied by the indicating lamp module is reduced in the intelligent panel with the button double-color backlight requirement, and a single backlight main control chip can be provided with more buttons with the backlight double-color function, thereby effectively avoiding the problem that the button is not enough when the IO pins of the backlight main control chip are not enough. The cost is high due to the increase of the extended chip; and the extended chip occupies the space of the circuit board.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent panel technical field, specifically to a kind of intelligent panel key backlight control system. BACKGROUND

[0002] Intelligent panel is applied to the operation panel of smart home, such as for controlling room air conditioner, ceiling lamp etc.. Current people's functional requirements to intelligent panel are more and more, and the key of intelligent panel needs to have double-color backlight, as the indicator light of key "on / off", and can be individually adjusted the brightness of two colors of light. For example, when the key of intelligent panel is in the on state, the backlight of this key is white, when the key is in the off state, the backlight of this key is yellow;Key backlight helps user to more easily see character content, and confirms the key position and switch state of home equipment;For example, the character of a key is "air conditioner", when user sees the backlight of this key is white, user knows that this key is on state, and air conditioner starts;When user sees the backlight of this key is yellow, user knows that this key is off state, and air conditioner stops.

[0003] Traditional intelligent panel with double-color backlight, in combination with Figure 1 One key operating device 3 needs to occupy two IO pins of backlight master control chip 4, that is, one IO pin of backlight master control chip 4 is set as key on indicator light module 11, and the other IO pin is set as key off indicator light module 12;IO pin is the signal input and output pin of backlight master control chip. For the intelligent panel with multiple keys, since the IO pin of backlight master control chip occupied by indicator light module is twice the number of keys, the number of IO pins of backlight master control chip occupied by indicator light module is also more and more, which is easy to cause the situation that the IO pin of backlight master control chip is not enough, and the traditional solution is to increase expansion chip, but it will increase the cost of expansion chip and the space occupied by expansion chip on circuit board.

[0004] Therefore, how to reduce the number of IO pins of backlight master control chip occupied by indicator light module in the intelligent panel with double-color backlight demand of key is a technical problem to be solved in the present technical field. INVENTION CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a kind of intelligent panel key backlight control system, reduce the number of IO pins of backlight master control chip occupied by indicator light module in the intelligent panel with double-color backlight demand of key.

[0006] The utility model is implemented as follows: a kind of intelligent panel key backlight control system, comprising:

[0007] Backlight switching device, key operation device, backlight main control chip and key operation device and backlight main control chip;

[0008] The backlight switching device comprises a key-on indicator lamp module, a key-off indicator lamp module, a lamp power supply, a first on-off module, a second on-off module and a shunt resistor.

[0009] The key-off backlight general control device comprises a third on-off module and a general control point.

[0010] The switching signal IO pin of the backlight main control chip is connected with the control end of the first on-off module, the signal input end of the first on-off module is connected with one end of the key-on indicator lamp module, the signal output end of the first on-off module is grounded, the other end of the key-on indicator lamp module is connected with the lamp power supply, one end of the shunt resistor is connected with one end of the key-on indicator lamp module, the other end of the shunt resistor is connected with the lamp power supply, the control end of the second on-off module is connected with one end of the shunt resistor, the signal input end of the second on-off module is connected with one end of the key-off indicator lamp module, the signal output end of the second on-off module is connected with the general control point, and the other end of the key-off indicator lamp module is connected with the lamp power supply.

[0011] The general-off signal IO pin of the backlight main control chip is connected with the control end of the third on-off module, the signal input end of the third on-off module is connected with the general control point, and the signal output end of the third on-off module is grounded.

[0012] The key signal IO pin of the backlight main control chip is connected with the key operation device.

[0013] Further, the first on-off module comprises a first NPN triode and a first resistor, the base of the first NPN triode is connected with one end of the first resistor, one end of the key-on indicator lamp module is connected with the collector of the first NPN triode, the emitter of the first NPN triode is grounded, and the other end of the first resistor is connected with the switching signal IO pin of the backlight main control chip.

[0014] The second on-off module comprises a second NPN triode and a second resistor, the base of the second NPN triode is connected with one end of the second resistor, one end of the key-off indicator lamp module is connected with the collector of the second NPN triode, the emitter of the second NPN triode is connected with the general control point, and the other end of the second resistor is connected with one end of the shunt resistor.

[0015] The third on-off module comprises a third NPN triode and a third resistor, one end of the third NPN triode is connected with one end of the third resistor, the collector of the third NPN triode is connected with the total control point, the emitter of the third NPN triode is grounded, and the other end of the third resistor is connected with the total-off signal IO pin of the backlight master control chip.

[0016] Further, the key-on indicating lamp module comprises a first color light emitting diode and a first current-limiting resistor, one end of the first current-limiting resistor is connected with the collector of the first NPN triode, the other end of the first current-limiting resistor is connected with the negative electrode of the first color light emitting diode, and the positive electrode of the first color light emitting diode is connected with the lamp power supply.

[0017] The key-off indicating lamp module comprises a second color light emitting diode and a second current-limiting resistor, one end of the second current-limiting resistor is connected with the collector of the second NPN triode, the other end of the second current-limiting resistor is connected with the negative electrode of the second color light emitting diode, and the positive electrode of the second color light emitting diode is connected with the lamp power supply.

[0018] Further, the first color light emitting diode emits white light, and the second color light emitting diode emits yellow light.

[0019] Further, the key operation device comprises a key, a pull-up resistor, a debouncing capacitor and a key power supply, one end of the key is connected with the key signal IO pin of the backlight master control chip, the other end of the key is grounded, one end of the pull-up resistor is connected with one end of the key, the other end of the pull-up resistor is connected with the key power supply, one end of the debouncing capacitor is connected with one end of the key, and the other end of the debouncing capacitor is grounded.

[0020] Further, the backlight master control chip is an MCU.

[0021] Further, the key-on indicating lamp module and the key-off indicating lamp module are both more than two and are arranged at the back of the key operation device.

[0022] Further, the key operation device is more than two, each key operation device is provided with one backlight switching device, the number of switching signal IO pins of the backlight master control chip is equal to the number of key operation devices, the number of key-off backlight total control devices is one, and the number of total-off signal IO pins of the backlight master control chip is equal to the number of key-off backlight total control devices.

[0023] Compared with the background art, the technical scheme of the present application has the following beneficial effects:

[0024] The button-on and button-off indicator light modules are uniformly set on the switching signal IO pin of the backlight main control chip by the backlight switching device. This allows the backlight main control chip to control the button-on and button-off indicator light modules with a single IO pin. The illumination states of the button-on and button-off indicator light modules corresponding to a single button are mutually exclusive. The added button-off backlight master control device occupies one IO pin of the backlight main control chip, namely the master-off signal IO pin, and is used to control the illumination state of all button-off indicator light modules. In smart panels that require dual-color backlighting for buttons, this reduces the number of IO pins occupied by the indicator light modules on the backlight main control chip. A single backlight main control chip can be set with more buttons with dual-color backlighting function on the smart panel, effectively avoiding the high cost and board space occupied by expansion chips when there are insufficient IO pins on the backlight main control chip. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the button connections for a traditional smart panel that implements dual-color backlighting in the background technology.

[0027] Figure 2 This is a schematic diagram of the structure of an intelligent panel button backlight control system according to this utility model.

[0028] Figure 3 This is a circuit diagram of the backlight switching device in this utility model.

[0029] Figure 4 This is a circuit diagram of the backlight control device with buttons in this utility model.

[0030] Figure 5 This is a circuit diagram of the button operation device in this utility model.

[0031] Figure 6 This is a waveform diagram showing that the duty cycle of the second PWM signal in this invention is less than or equal to the duty cycle of the first PWM signal. Detailed Implementation

[0032] This utility model embodiment provides an intelligent panel button backlight control system. The overall technical concept is as follows:

[0033] Each button on the smart panel is equipped with a backlight switching device. When the power is on, the illumination states of the button-on indicator light module and the button-off indicator light module in the backlight switching device are mutually exclusive. When the button-on indicator light module is lit, the button-off indicator light module is off, and when the button-on indicator light module is off, the button-off indicator light module is lit.

[0034] One backlight switching device occupies one IO pin of a backlight master control chip, realizes that the key open indication lamp module and the key off indication lamp module are controlled by one IO pin of the backlight master control chip, and compared with the prior art, two IO pins are needed to set the key open indication lamp module and the key off indication lamp module, and the indication lamp module of the utility model occupies the number of IO pins of the backlight master control chip is less.

[0035] The luminous brightness of the key open indication lamp module and the key off indication lamp module can be adjusted independently; when one key of the smart panel is in the open state, the key operation device where the key is located sends a signal to the backlight master control chip, the backlight master control chip sends the first PWM signal to the corresponding backlight switching device, the key open indication lamp module corresponding to the key emits light, and the luminous brightness is determined by the duty ratio of the first PWM signal, and the key off indication lamp module corresponding to the key is extinguished; the backlight master control chip simultaneously sends the second PWM signal to the key off backlight general control device, other keys of the smart panel are in the off state, the key operation device where the other keys are located sends a signal to the backlight master control chip, the backlight master control chip sends the continuous low-level signal to the corresponding backlight switching device, so that the key open indication lamp module corresponding to the other keys is extinguished, but the key off indication lamp module emits light, and the luminous brightness of all key off indication lamp modules is determined by the duty ratio of the second PWM signal.

[0036] In order to better understand the above technical solutions, the above technical solutions will be described in detail in combination with the drawings of the specification and specific embodiments.

[0037] Referring to Figures 1 to 6 The preferred embodiment of the utility model.

[0038] A smart panel key backlight control system, comprising:

[0039] The backlight switching device 1, the key off backlight general control device 2, the key operation device 3 and the backlight master control chip 4;

[0040] The backlight switching device 1, comprising: key open indication lamp module 11, key off indication lamp module 12, lamp power supply, first on-off module 13, second on-off module 14 and shunt resistance R0;

[0041] The key off backlight general control device 2, comprising: third on-off module 21 and general control point P;

[0042] The switching signal IO pin 41 of the backlight master control chip 4 is connected with the control end of the first on-off module 13, the signal input end of the first on-off module 13 is connected with one end of the key-on indicating lamp module 11, the signal output end of the first on-off module 13 is grounded, the other end of the key-on indicating lamp module 11 is connected with the lamp power supply, one end of the shunt resistor R0 is connected with one end of the key-on indicating lamp module 11, the other end of the shunt resistor R0 is connected with the lamp power supply, the control end of the second on-off module 14 is connected with one end of the shunt resistor R0, the signal input end of the second on-off module 14 is connected with one end of the key-off indicating lamp module 12, the signal output end of the second on-off module 14 is connected with the total control point P, and the other end of the key-off indicating lamp module 12 is connected with the lamp power supply.

[0043] The total-off signal IO pin 42 of the backlight master control chip 4 is connected with the control end of the third on-off module 21, the signal input end of the third on-off module 21 is connected with the total control point P, and the signal output end of the third on-off module 21 is grounded.

[0044] The key signal IO pin 43 of the backlight master control chip 4 is connected with the key operation device 3.

[0045] The beneficial effects of the technical scheme of the utility model are as follows: the key-on indicating lamp module 11 and the key-off indicating lamp module 12 are uniformly arranged at the switching signal IO pin 41 of the backlight master control chip 4 by the backlight switching device 1, the key-on indicating lamp module 11 and the key-off indicating lamp module 12 are controlled by one IO pin of the backlight master control chip 4, and the light-emitting states of the key-on indicating lamp module 11 and the key-off indicating lamp module 12 corresponding to one key are mutually exclusive; the key-off backlight total control device 2 is additionally arranged, one IO pin of the backlight master control chip 4, namely the total-off signal IO pin 42, is occupied, and the light-emitting states of all key-off indicating lamp modules 12 are controlled; in the intelligent panel with the demand of key double-color backlight, the number of IO pins of the backlight master control chip 4 occupied by the indicating lamp module is reduced, a larger number of keys with the backlight double-color function can be arranged in the intelligent panel by one backlight master control chip 4, and the high cost caused by the increase of the expansion chip and the space of the circuit board occupied by the expansion chip can be effectively avoided.

[0046] In the background art, the expansion chip is specifically a GPIO expansion chip, and the backlight master control chip is an MCU; when the IO pins of the MCU are insufficient, the GPIO expansion chip is arranged to increase the number of IO pins. However, the technical idea of the utility model is to reduce the number of IO pins of the backlight master control chip occupied by the indicating lamp module in the intelligent panel with the demand of key double-color backlight, and a larger number of keys with the backlight double-color function can be arranged in the intelligent panel by one backlight master control chip.

[0047] The on-off module can select a device with switching function such as a triode, a MOS tube, etc. The color of light emitted by the key-on indicator light module 11 and the key-off indicator light module 12 is different. The power for the lamp is +5V.

[0048] Further, the first on-off module 13 comprises a first NPN triode Q1 and a first resistor R1, one end of the first NPN triode Q1 is connected with the first resistor R1, the collector of the first NPN triode Q1 is connected with one end of the key-on indicator light module 11, the emitter of the first NPN triode Q1 is grounded, and the other end of the first resistor R1 is connected with the switching signal IO pin 41 of the backlight master control chip 4.

[0049] The second on-off module 14 comprises a second NPN triode Q2 and a second resistor R2, the base of the second NPN triode Q2 is connected with one end of the second resistor R2, the collector of the second NPN triode Q2 is connected with one end of the key-off indicator light module 12, the emitter of the second NPN triode Q2 is connected with the total control point P, and the other end of the second resistor R2 is connected with one end of the shunt resistor R0.

[0050] The third on-off module 21 comprises a third NPN triode Q3 and a third resistor R3, the base of the third NPN triode Q3 is connected with one end of the third resistor R3, the collector of the third NPN triode Q3 is connected with the total control point P, the emitter of the third NPN triode Q3 is grounded, and the other end of the third resistor R3 is connected with the total-off signal IO pin 42 of the backlight master control chip 4.

[0051] The working principle of the NPN triode as a switch is that when the base is high, the collector and the emitter are turned on, and when the base is low, the collector and the emitter are turned off.

[0052] Further, the key-on indicator light module 11 comprises a first color light-emitting diode LED1 and a first current-limiting resistor R10, one end of the first current-limiting resistor R10 is connected with the collector of the first NPN triode Q1, the other end of the first current-limiting resistor R10 is connected with the negative electrode of the first color light-emitting diode LED1, and the positive electrode of the first color light-emitting diode LED1 is connected with the power for the lamp.

[0053] The key indication light module 12 comprises a second color light emitting diode LED2 and a second current limiting resistor R20, one end of the second current limiting resistor R20 is connected with the collector of the second NPN triode Q2, the other end of the second current limiting resistor R20 is connected with the negative electrode of the second color light emitting diode LED2, and the positive electrode of the second color light emitting diode LED2 is connected with the lamp power supply.

[0054] The light emitting diode has the advantages of energy saving, long service life.

[0055] Further, the first color light emitting diode LED1 emits white light, and the second color light emitting diode LED2 emits yellow light.

[0056] The light emitting colors of the first color light emitting diode LED1 and the second color light emitting diode LED2 can be other combinations of different colors.

[0057] Further, the key operation device 3 comprises a key SW1, a pull-up resistor R30, a debouncing capacitor C1 and a key power supply, one end of the key SW1 is connected with the key signal IO pin 43 of the backlight master chip 4, the other end of the key SW1 is grounded, one end of the pull-up resistor R30 is connected with one end of the key SW1, the other end of the pull-up resistor R30 is connected with the key power supply, one end of the debouncing capacitor C1 is connected with one end of the key SW1, and the other end of the debouncing capacitor C1 is grounded.

[0058] When the key SW1 is closed, the debouncing capacitor C1 is discharged, the key signal IO pin 43 of the backlight master chip 4 is at low level, and the backlight master chip 4 receives the signal that the key SW1 is in the off state; when the key SW1 is disconnected, the key power supply quickly charges the debouncing capacitor C1, and after the debouncing capacitor C1 is fully charged, the key signal IO pin 43 of the backlight master chip 4 is at high level, and the backlight master chip 4 receives the signal that the key SW1 is in the on state; the key power supply is +3.3V.

[0059] When the key is pressed, due to mechanical vibration, the key may vibrate, causing the backlight master chip to misjudge the key state. By connecting a debouncing capacitor in parallel in the key circuit, the voltage of the capacitor cannot be suddenly changed, when the key is released, the capacitor will be slowly charged, thereby preventing false touch caused by key vibration.

[0060] Further, the backlight master chip 4 is an MCU.

[0061] Further, the key-on indicating light module 11 and the key-off indicating light module 12 are both two or more and are arranged at the back of the key operating device 3 in intervals. The backlight of the key is displayed more clearly, and the user can identify it more easily.

[0062] Further, the key operating device 3 is two or more, each of the key operating device 3 is configured with a backlight switching device 1, the number of switching signal IO pins 41 of the backlight master control chip 4 is equal to the number of the key operating device 3, the number of the key-off backlight master control device 2 is one, and the number of the total-off signal IO pins 42 of the backlight master control chip 4 is equal to the number of the key-off backlight master control device 2.

[0063] For example, the smart panel has six keys, and in the utility model, the key operating device 3 has six, the key signal IO pin 43 of the backlight master control chip 4 has six, the backlight switching device 1 has six, the switching signal IO pin 41 of the backlight master control chip 4 has six, the key-off backlight master control device 2 has only one, and the total-off signal IO pin 42 of the backlight master control chip 4 has one, so the IO pin number of the backlight master control chip 4 occupied by the utility model is thirteen at this time.

[0064] Compared with the background art, in the traditional implementation of the double-color backlight smart panel, the key operating device 3 occupies six IO pins of the backlight master control chip, the key-on indicating light module 11 occupies six IO pins of the backlight master control chip 4, the key-off indicating light module 12 occupies six IO pins of the backlight master control chip 4, and the total IO pin number of the backlight master control chip 4 occupied is eighteen.

[0065] A smart panel key backlight control method using the above smart panel key backlight control system, comprising:

[0066] When the key of the key operating device 3 is pressed, the backlight master control chip 4 sends the key-on signal to the backlight switching device 1, the backlight switching device 1 corresponds to the key operating device 3, the backlight master control chip 4 also sends the key-off indicating light master control light-emitting signal to the key-off backlight master control device 2, the first on-off module 13 becomes the conduction state, the key-on indicating light module 11 emits light, the second on-off module 14 becomes the off state, the key-off indicating light module 12 is extinguished, and the third on-off module 21 is in the conduction state.

[0067] When the key of the key operating device 3 is pressed again, the backlight master control chip 4 sends the key-off signal to the backlight switching device 1, and the backlight master control chip 4 also sends the key-off indicator light total control light-emitting signal to the key-off backlight total control device 2, the first on-off module 13 becomes the off state, the key-on indicator light module 11 is extinguished, the second on-off module 14 becomes the on state, the third on-off module 21 is in the on state, and the key-off indicator light module 12 emits light.

[0068] When the key of the key operating device 3 is a self-locking key, the key is pressed, the key is in the on state, and the backlight master control chip 4 sends the key-on signal to the backlight switching device 1; the key is pressed again, the key becomes the off state, and the backlight master control chip 4 sends the key-off signal to the backlight switching device 1.

[0069] When the key of the key operating device 3 is a light touch key, each time the key is pressed, a level signal is generated and sent to the backlight master control chip 4, and the backlight master control chip 4 alternately sends the key-on signal and the key-off signal to the backlight switching device 1.

[0070] When the key of the key operating device 3 is in the on state without the need to adjust the brightness of the indicator light, the backlight master control chip 4 sends the high-level signal to the corresponding backlight switching device 1, and simultaneously sends the high-level to the key-off backlight total control device 2, the base of the first NPN triode Q1 is high-level, the first NPN triode Q1 is turned on, the first color light-emitting diode LED1 is powered on to emit white light, the base of the second NPN triode Q2 is low-level, the second NPN triode Q2 is cut off, the second color light-emitting diode LED2 is powered off and extinguished, and the base of the third NPN triode Q3 is high-level, the third NPN triode Q3 remains in the on state.

[0071] When the key of the key operating device 3 is in the off state, the backlight master control chip 4 sends the low-level signal to the corresponding backlight switching device 1, and simultaneously sends the high-level to the key-off backlight total control device 2, the base of the first NPN triode Q1 is low-level, the first NPN triode Q1 is cut off, the first color light-emitting diode LED1 is powered off and extinguished, the base of the second NPN triode Q2 becomes high-level, the second NPN triode Q2 is turned on, the base of the third NPN triode Q3 is high-level, the third NPN triode Q3 remains in the on state, and the second color light-emitting diode LED2 is powered on to emit yellow light.

[0072] Further, the key-on signal is a first PWM signal, the key-off indicator light general control light-emitting signal is a second PWM signal, the key-off signal is a low-level signal, a starting waveform of the first PWM signal is consistent with a starting waveform of the second PWM signal, and a duty cycle of the second PWM signal is less than or equal to a duty cycle of the first PWM signal.

[0073] The first PWM signal sent by the backlight master control chip 4 is used for adjusting the luminance of the key-on indicator light module 11, and the second PWM signal sent by the backlight master control chip 4 is used for adjusting the luminance of the key-off indicator light module 12, so that the demand for separately adjusting the key backlight luminance of the intelligent panel is met.

[0074] The PWM signal is a pulse width modulation signal, which is a digital signal composed of high and low levels, and the time proportion of the high level and the low level can be adjusted, and the proportion of the time of the high level to the signal period is called the duty cycle. In the utility model, the higher the duty cycle of the PWM signal is, the higher the luminance of the indicator light is, and the smaller the duty cycle of the PWM signal is, the dimmer the luminance of the indicator light is.

[0075] The duty cycle of the second PWM signal is less than or equal to the duty cycle of the first PWM signal, that is, when the first PWM signal is at a high level, the second PWM signal can be at a high level or at a low level, and when the first PWM signal is at a low level, the second PWM signal must be at a low level.

[0076] For example, the intelligent panel has six keys, when the first key is in an on state and the other keys are in an off state, the backlight master control chip 4 sends the first PWM signal to the backlight switching device 1 corresponding to the first key, sends a low-level signal to the backlight switching device 1 corresponding to the other keys, and sends the second PWM signal to the key-off backlight general control device 2; the first color light-emitting diode LED 1 corresponding to the first key emits white light, and the second color light-emitting diode LED 2 is extinguished; the first color light-emitting diode LED 1 corresponding to the other keys is extinguished, and the second color light-emitting diode LED 2 emits yellow light. When the first key is in an off state, the backlight master control chip 4 sends a low-level signal to the backlight switching device 1 corresponding to the first key, and the first color light-emitting diode LED 1 corresponding to the first key is extinguished, and the second color light-emitting diode LED 2 emits yellow light.

[0077] The duty cycle of the second PWM signal is less than or equal to the duty cycle of the first PWM signal, and specifically, when the duty cycle of the first PWM signal is 100%, the light-emitting height of the first color light-emitting diode LED1 is maximum, and the duty cycle of the second PWM signal can be freely adjusted between 0-100%, so that the light-emitting brightness adjustment range of the second color light-emitting diode LED2 is maximum; when the duty cycle of the first PWM signal is 50%, the light-emitting brightness of the first color light-emitting diode LED1 is halved, and the duty cycle of the second PWM signal can be freely adjusted between 0-50%, so that the light-emitting brightness adjustment range of the second color light-emitting diode LED2 is halved; when the duty cycle of the first PWM signal is 20%, the light-emitting brightness of the first color light-emitting diode LED1 is further reduced, and the duty cycle of the second PWM signal can be freely adjusted between 0-20%, so that the light-emitting brightness adjustment range of the second color light-emitting diode LED2 is further reduced. When the duty cycle of the second PWM signal is fixed at 20%, the duty cycle of the first PWM signal can be changed between 20-100%. The independent dimming of the first color light-emitting diode LED1 and the second color light-emitting diode LED2 is realized.

[0078] When the key backlight is fully on, the user can more easily see the key character content, at this time, the light-emitting brightness of the key-on indicating lamp module 11 and the key-off indicating lamp module 12 reaches maximum, and the duty cycles of the first PWM signal and the second PWM signal are both 100%.

[0079] When the key backlight is fully off, the light-sensitive user can avoid the interference of the backlight of the intelligent panel and improve sleep. At this time, the key-on indicating lamp module 11 and the key-off indicating lamp module 12 do not emit light, and the duty cycles of the first PWM signal and the second PWM signal are both 0%.

[0080] When the key backlight is energy-saving, the user can conveniently find the keys of the intelligent panel in a pitch-black environment. At this time, the light-emitting brightness of the key-on indicating lamp module 11 and the key-off indicating lamp module 12 is reduced, for example, the duty cycles of the first PWM signal and the second PWM signal are both 50%.

[0081] Although the specific embodiments of the present application are described above, those skilled in the art should understand that the specific embodiments described are only illustrative, and are not intended to limit the scope of the present application, and equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present application should be covered within the scope of the claims of the present application.

Claims

1. An intelligent faceplate key backlighting control system, characterized by, The application relates to a backlight switching device, a key-operated backlight-off general control device, a key-operated device and a backlight master control chip. The backlight switching device comprises a key-on indicating lamp module, a key-off indicating lamp module, a lamp power supply, a first on-off module, a second on-off module and a shunt resistor. The key-off backlight general control device comprises a third on-off module and a general control point. The switching signal IO pin of the backlight master control chip is connected with the control end of the first on-off module, the signal input end of the first on-off module is connected with one end of the key-on indicating lamp module, the signal output end of the first on-off module is grounded, the other end of the key-on indicating lamp module is connected with the lamp power supply, one end of the shunt resistor is connected with one end of the key-on indicating lamp module, the other end of the shunt resistor is connected with the lamp power supply, the control end of the second on-off module is connected with one end of the shunt resistor, the signal input end of the second on-off module is connected with one end of the key-off indicating lamp module, the signal output end of the second on-off module is connected with the general control point, and the other end of the key-off indicating lamp module is connected with the lamp power supply. The general-off signal IO pin of the backlight master control chip is connected with the control end of the third on-off module, the signal input end of the third on-off module is connected with the general control point, and the signal output end of the third on-off module is grounded. The key signal IO pin of the backlight master control chip is connected with the key-operated device. The first on-off module comprises a first NPN triode and a first resistor, the base of the first NPN triode is connected with one end of the first resistor, the collector of the first NPN triode is connected with one end of the key-on indicating lamp module, the emitter of the first NPN triode is grounded, and the other end of the first resistor is connected with the switching signal IO pin of the backlight master control chip.

2. The intelligent faceplate key backlighting control system of claim 1, wherein, The second on-off module comprises a second NPN triode and a second resistor, the base of the second NPN triode is connected with one end of the second resistor, the collector of the second NPN triode is connected with one end of the key-off indicating lamp module, the emitter of the second NPN triode is connected with the general control point, and the other end of the second resistor is connected with one end of the shunt resistor. The third on-off module comprises a third NPN triode and a third resistor, the base of the third NPN triode is connected with one end of the third resistor, the collector of the third NPN triode is connected with the general control point, the emitter of the third NPN triode is grounded, and the other end of the third resistor is connected with the general-off signal IO pin of the backlight master control chip. The key-on indicating lamp module comprises a first color light-emitting diode and a first current-limiting resistor, one end of the first current-limiting resistor is connected with the collector of the first NPN triode, the other end of the first current-limiting resistor is connected with the negative electrode of the first color light-emitting diode, and the positive electrode of the first color light-emitting diode is connected with the lamp power supply.

3. The intelligent faceplate key backlighting control system of claim 2, wherein, ​ The key off indicating light module comprises a second color light emitting diode and a second current limiting resistor, one end of the second current limiting resistor is connected with the collector of the second NPN triode, the other end of the second current limiting resistor is connected with the negative electrode of the second color light emitting diode, and the positive electrode of the second color light emitting diode is connected with the lamp power supply.

4. The intelligent faceplate key backlighting control system of claim 3, wherein, The first color light emitting diode emits white light, and the second color light emitting diode emits yellow light.

5. The intelligent faceplate key backlighting control system of claim 1, wherein, The key operation device comprises a key, a pull-up resistor, a debouncing capacitor and a key power supply, one end of the key is connected with the key signal IO pin of the backlight master chip, the other end of the key is grounded, one end of the pull-up resistor is connected with one end of the key, the other end of the pull-up resistor is connected with the key power supply, one end of the debouncing capacitor is connected with one end of the key, and the other end of the debouncing capacitor is grounded.

6. The intelligent faceplate key backlighting control system of claim 1, wherein, The backlight master chip is an MCU.

7. The intelligent faceplate key backlighting control system of claim 1, wherein, The key off indicating light module and the key off indicating light module both have two or more and are arranged at intervals on the back of the key operation device.

8. The intelligent faceplate key backlighting control system of claim 1, wherein, The key operation device has two or more, each key operation device is provided with a backlight switching device, the number of switching signal IO pins of the backlight master chip is equal to the number of key operation devices, the number of key off backlight master control devices is one, and the number of total off signal IO pins of the backlight master chip is equal to the number of key off backlight master control devices. The key off indicating light module comprises a second color light emitting diode and a second current limiting resistor, one end of the second current limiting resistor is connected with the collector of the second NPN triode, the other end of the second current limiting resistor is connected with the negative electrode of the second color light emitting diode, and the positive electrode of the second color light emitting diode is connected with the lamp power supply. The first color light emitting diode emits white light, and the second color light emitting diode emits yellow light. The key operation device comprises a key, a pull-up resistor, a debouncing capacitor and a key power supply, one end of the key is connected with the key signal IO pin of the backlight master chip, the other end of the key is grounded, one end of the pull-up resistor is connected with one end of the key, the other end of the pull-up resistor is connected with the key power supply, one end of the debouncing capacitor is connected with one end of the key, and the other end of the debouncing capacitor is grounded. The backlight master chip is an MCU. The key off indicating light module and the key off indicating light module both have two or more and are arranged at intervals on the back of the key operation device. The key operation device has two or more, each key operation device is provided with a backlight switching device, the number of switching signal IO pins of the backlight master chip is equal to the number of key operation devices, the number of key off backlight master control devices is one, and the number of total off signal IO pins of the backlight master chip is equal to the number of key off backlight master control devices.

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