Automatic dimming keyboard with multiple PS / 2 channels

Abstract

The utility model discloses a multi PS / 2 channel automatic dimming keyboard, which relates to the technical field of touch control and image display, and comprises a plurality of signal sources, a plurality of level conversion chips, a multi PS / 2 channel automatic dimming module, a PS / 2 channel change-over switch, a manual dimming knob and a photosensitive sensor, through row and column scanning of the keyboard, the key of the action is identified, and the corresponding key information is converted into a 3.3 V PS / 2 signal. Handshake with a computer is completed by detecting a PS / 2 channel reset command and replying a response, action keys are rapidly identified by scanning a keyboard, a signal output mode is determined according to a PS / 2 channel switching switch signal state, a PWM signal is output through a manual dimming knob signal and an external photosensitive sensor signal, and a PWM duty ratio is used for switching on and off the keyboard. The problem that the keyboard brightness can be manually adjusted and automatically adjusted according to ambient light is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of touch control and image display, and in particular to a multi-PS / 2 channel automatic dimming keyboard. Background Art

[0002] In traditional computer systems, each computer is equipped with a keyboard to meet the usage requirements. In the industrial and military fields, a single keyboard is required to control multiple computers in time-sharing or simultaneously. When using a single-channel keyboard hard switch mode to switch multiple computers, because the computer does not support PS / 2 hot switching, the computer must be restarted after the hard switch, which greatly reduces the work efficiency of the personnel. In addition, in order to reduce the light pollution caused by using the keyboard at night, the keyboard is required to not only emit light, but also be dimmable according to the comfort level of the human eye when observing at night. Requirements are put forward for the maximum brightness, minimum brightness, and luminous level of the keyboard, and the brightness can be adjusted manually and automatically according to the ambient light.

[0003] A multi-PS / 2 channel automatic dimming keyboard can realize time-sharing or simultaneous control of multiple computers by a single keyboard, realize hot switching of computer PS / 2, and can manually adjust the keyboard backlight brightness and automatically adjust it according to ambient light. It is urgently needed in the industrial field, especially the military field. Utility Model Content

[0004] In order to solve the above technical problems, a multi-PS / 2 channel automatic dimming keyboard is provided. This technical solution solves the problem of a single keyboard controlling multiple computers in time-sharing or simultaneously proposed in the above background technology, and solves the problem of requiring the maximum brightness, minimum brightness, lighting level, and brightness of the keyboard to be manually adjusted or automatically adjusted according to the ambient light.

[0005] In order to achieve the above objectives, the technical solutions adopted in this utility are:

[0006] A multi-PS / 2 channel automatic dimming keyboard, comprising:

[0007] A plurality of signal sources, wherein the plurality of signal sources are PS / 2 display signals output by a computer motherboard;

[0008] Several level conversion chips, electrically connected to the computer, for converting the level of the PS / 2 signal, converting the 5V TTL signal output by the computer into 3.3V that can be received by the multi-PS / 2 channel automatic dimming module. The number of the level conversion chips is the same as the number of computers;

[0009] A multi-PS / 2 channel automatic dimming module, which is used to receive keyboard key information, identify the active key by scanning the keyboard rows and columns, and convert the corresponding key information into a 3.3V PS / 2 signal. The multi-PS / 2 channel automatic dimming module is used to receive signals from the manual dimming knob and the external photosensor, and output multiple PWM signals through non-linear algorithm conversion for controlling the brightness of the key LEDs;

[0010] A PS / 2 channel switching switch electrically connected to the multi-PS / 2 channel automatic dimming module for outputting a switch signal according to the switch state and transmitting the switch signal to the multi-PS / 2 channel automatic dimming module to determine whether to output multiple PS / 2 signals simultaneously or output a single PS / 2 signal in a time-sharing manner;

[0011] A manual dimming knob electrically connected to the multi-PS / 2 channel automatic dimming module for transmitting the encoder signal of the manual dimming knob to the multi-PS / 2 channel automatic dimming module. The encoder direction determines the change in PWM pulse width, thereby determining whether the brightness increases or decreases.

[0012] A photosensor is used to sense the external ambient light and convert the intensity of the external ambient light into the intensity of the current. After I / U conversion, the current is transmitted to the multi-PS / 2 channel automatic dimming module;

[0013] A plurality of buttons, wherein the plurality of buttons are electrically connected to the multi-PS / 2 channel automatic dimming module and are used to generate button information;

[0014] LEDs are used to provide backlighting for each keyboard key.

[0015] Preferably, the multi-PS / 2 channel automatic dimming module receives the switching signal of the PS / 2 channel switching switch, and determines to output multiple PS / 2 signals at the same time or output a single PS / 2 signal in time-sharing by detecting the different states of the switch. Different PS / 2 signals are transmitted to the computer after passing through the level conversion chip.

[0016] Preferably, when the multi-PS / 2 channel automatic dimming module communicates with the computer through the PS / 2 signal, it needs to wait in real time to detect the reset command from the PS / 2 channels of different computers. When the multi-PS / 2 channel automatic dimming module receives the PS / 2 channel reset command, it immediately responds and completes the PS / 2 channel handshake operation.

[0017] Preferably, the multi-PS / 2 channel automatic dimming module receives keyboard key information, quickly identifies the action key by performing row scanning and column scanning on the keyboard, and converts the key information into the corresponding keyboard key value, encodes it according to the PS / 2 protocol, and based on the encoded PS / 2 signal, determines to output a single PS / 2 signal or output multiple PS / 2 signals at the same time according to the PS / 2 channel switching switch signal state, wherein the PS / 2 signal includes a clock signal and a data signal.

[0018] Preferably, the multi-PS / 2 channel automatic dimming module receives the signal of the manual dimming knob and the automatic dimming signal of the external photosensor, wherein the automatic dimming signal is prioritized by default. If a change in the manual knob dimming signal is detected, the automatic dimming function is shielded and enters the manual dimming mode. If the manual dimming knob switch is turned off, the automatic dimming mode is restored.

[0019] Preferably, the signal of the manual dimming knob is an encoder pulse signal. When the knob is rotated clockwise, a positive phase pulse is output, and the automatic dimming module increases the output PWM duty cycle. When the knob is rotated counterclockwise, a negative phase pulse is output, and the automatic dimming module decreases the output PWM duty cycle. The PWM duty cycle changes nonlinearly according to the brightness requirements, and is used to ensure the maximum brightness, minimum brightness and brightness level of the key backlight.

[0020] Compared with the prior art, the beneficial effects of this invention are:

[0021] The utility model proposes a multi-PS / 2 channel automatic dimming keyboard, which completes the handshake with the computer by waiting for and detecting the reset command and reply response from the PS / 2 channels of different computers in real time, quickly identifies the action key by performing row and column scanning on the keyboard, and determines to output a certain channel or send multiple channels of PS / 2 signal at the same time according to the state of the PS / 2 channel switch signal. By receiving the manual dimming knob signal and the external light sensor signal, the PWM signal is output, and the PWM duty cycle is nonlinearly changed according to the brightness requirement, so as to ensure the linear adjustment of the key backlight brightness, the adjustment level, the maximum brightness and the minimum brightness. The utility model solves the problem of a single keyboard controlling multiple computers in time-sharing or at the same time, and solves the problem of requiring the maximum brightness, minimum brightness, light level and brightness of the keyboard to be manually adjusted or automatically adjusted according to the ambient light. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural block diagram of a multi-PS / 2 channel automatic dimming keyboard proposed in this application. DETAILED DESCRIPTION

[0023] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0024] Reference Figure 1 As shown, a multi-PS / 2 channel automatic dimming keyboard in this practical embodiment includes:

[0025] Some signal sources are PS / 2 display signals output by computer motherboards;

[0026] Several level conversion chips are used to convert the PS / 2 signal level, converting the 5V TTL signal output by the computer into 3.3V that can be received by the multi-PS / 2 channel automatic dimming module. The number of level conversion chips is the same as the number of computers;

[0027] The multi-PS / 2 channel automatic dimming module is electrically connected to the level conversion chip;

[0028] The multi-PS / 2 channel automatic dimming module is electrically connected to the keyboard keys;

[0029] The multi-PS / 2 channel automatic dimming module is electrically connected to the PS / 2 channel switch;

[0030] The multi-PS / 2 channel automatic dimming module is electrically connected to the manual dimming knob;

[0031] The multi-PS / 2 channel automatic dimming module is electrically connected to the external photosensor;

[0032] The multi-PS / 2 channel automatic dimming module is electrically connected to the LED lamp.

[0033] Specifically, the level conversion chips are Texas Instruments' TXS0102DCTR chips, which implement bidirectional level conversion, converting the 5V TTL signal output by the computer into 3.3V that can be received by the multi-PS / 2 channel automatic dimming module. The number of level conversion chips is the same as the number of computers.

[0034] The multi-PS / 2 channel automatic dimming module uses ST's STM32F103C8T6 MCU, which is used to receive keyboard key information. By scanning the rows and columns of the keyboard, the occupied keys are identified. The number of MCU IO pins occupied by M key information is A+B (the product of A and B is M).

[0035] The multi-PS / 2 channel automatic dimming module receives information from the PS / 2 channel switch and determines whether to output multiple PS / 2 signals at the same time, or output a single PS / 2 signal in time-sharing mode. The PS / 2 channel switch has N+1 positions, where position N is the output of the Nth channel and position N+1 is the simultaneous output of all channels.

[0036] When the multi-PS / 2 channel automatic dimming module communicates with the computer through the PS / 2 signal, it needs to wait and detect the reset command from the PS / 2 channel of different computers in real time. Once the PS / 2 channel automatic dimming module receives the reset command of a certain computer PS / 2 channel, it will respond immediately and complete the handshake operation of the PS / 2 channel.

[0037] The multi-PS / 2 channel automatic dimming module is used to receive signals from the manual dimming knob and the external light sensor, and output multiple PWM signals through nonlinear algorithm conversion to control the brightness of the key LED;

[0038] The manual dimming knob is the RE1108CJ1-V03-4919 encoder from Linjiwei. When the knob is rotated clockwise, it outputs a positive phase pulse, and the automatic dimming module increases the output PWM duty cycle. When the knob is rotated counterclockwise, it outputs a negative phase pulse, and the automatic dimming module decreases the output PWM duty cycle.

[0039] The photosensor is the LXD / GB5-A1DPH from Shenzhen Longxinda Company, placed in a position where external ambient light can directly penetrate. The photosensor is used to sense the external ambient light and convert the intensity of the external ambient light into the intensity of the current. After the I / U conversion, it is sent to the multi-PS / 2 channel automatic dimming module;

[0040] Furthermore, the method for implementing the automatic dimming keyboard of this solution includes the following steps:

[0041] Step 1: Detect reset commands from different computer PS / 2 channels. When receiving a reset command from a certain computer PS / 2 channel, respond immediately to complete the handshake operation of the PS / 2 channel.

[0042] Step 2: Get the key information, remove the key jitter through the delay program, scan the keyboard column to determine whether there is a key pressed in the column, then scan the keys line by line to determine the specific action key, and convert the key action information into the corresponding key value;

[0043] Step 3: Obtain the PS / 2 channel switch status, and determine whether to output multiple PS / 2 signals simultaneously or output a single PS / 2 signal in a time-sharing manner based on different switch states;

[0044] Step 4: If step 3 is a multi-channel simultaneous output state, the key value generated in step 2 is output to multiple channels. If step 3 is a certain channel output state, the key value generated in step 2 is output to this channel. The output signal is a 3.3V clock and data signal.

[0045] Step 5: Detect the signals of the manual dimming knob and the external light sensor. The automatic dimming signal takes priority. Once a change in the manual dimming signal is detected, the automatic dimming function is disabled and the system enters the manual dimming mode. To restore the automatic dimming mode, turn off the manual dimming knob.

[0046] Step 6: Based on the logic of step 5, after conversion by nonlinear algorithm, multiple PWM signals are controlled and output to control the brightness of the key LEDs.

[0047] Step 7: Return to step 1.

[0048] To sum up, the advantages of this utility are: this utility proposes a multi-PS / 2 channel automatic dimming keyboard, which completes the handshake with the computer by waiting for and detecting the reset commands and reply responses from the PS / 2 channels of different computers in real time, quickly identifies the action keys by scanning the rows and columns of the keyboard, and determines to output a certain channel or send multiple channels of PS / 2 signals at the same time according to the switch signal state of the PS / 2 channel. By receiving the manual dimming knob signal and the external photosensor signal, the PWM signal is output, and the PWM duty cycle changes nonlinearly according to the brightness requirements to ensure the linear adjustment of the key backlight brightness, the adjustment level, the maximum brightness and the minimum brightness, which solves the problem of a single keyboard controlling multiple computers in time-sharing or at the same time, and solves the problem of requiring the maximum brightness, minimum brightness, light level and brightness of the keyboard to be manually adjusted or automatically adjusted according to the ambient light.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-PS / 2 channel automatic dimming keyboard, characterized in that: include: A plurality of signal sources, wherein the plurality of signal sources are PS / 2 display signals output by a computer motherboard; Several level conversion chips, electrically connected to the computer, for converting the level of the PS / 2 signal, converting the 5V TTL signal output by the computer into 3.3V that can be received by the multi-PS / 2 channel automatic dimming module. The number of the level conversion chips is the same as the number of computers; A multi-PS / 2 channel automatic dimming module, which is used to receive keyboard key information, identify the active key by scanning the keyboard rows and columns, and convert the corresponding key information into a 3.3V PS / 2 signal. The multi-PS / 2 channel automatic dimming module is used to receive signals from the manual dimming knob and the external photosensor, and output multiple PWM signals through non-linear algorithm conversion for controlling the brightness of the key LEDs; A PS / 2 channel switching switch electrically connected to the multi-PS / 2 channel automatic dimming module for outputting a switch signal according to the switch state and transmitting the switch signal to the multi-PS / 2 channel automatic dimming module to determine whether to output multiple PS / 2 signals simultaneously or output a single PS / 2 signal in a time-sharing manner; A manual dimming knob electrically connected to the multi-PS / 2 channel automatic dimming module for transmitting the encoder signal of the manual dimming knob to the multi-PS / 2 channel automatic dimming module. The encoder direction determines the change in PWM pulse width, thereby determining whether the brightness increases or decreases. A photosensor is used to sense the external ambient light and convert the intensity of the external ambient light into the intensity of the current. After I / U conversion, the current is transmitted to the multi-PS / 2 channel automatic dimming module; A plurality of buttons, wherein the plurality of buttons are electrically connected to the multi-PS / 2 channel automatic dimming module and are used to generate button information; LEDs are used to provide backlighting for each keyboard key.

2. The multi-PS / 2 channel automatic dimming keyboard according to claim 1, characterized in that: The multi-PS / 2 channel automatic dimming module receives the switch signal of the PS / 2 channel switching switch, and determines whether to output multiple PS / 2 signals simultaneously or output a single PS / 2 signal in a time-sharing manner by detecting the different states of the switch. The different PS / 2 signals are transmitted to the computer after passing through the level conversion chip.

3. The multi-PS / 2 channel automatic dimming keyboard according to claim 1, characterized in that: When the multi-PS / 2 channel automatic dimming module communicates with the computer via the PS / 2 signal, it needs to wait in real time to detect the reset command from the PS / 2 channels of different computers. When the multi-PS / 2 channel automatic dimming module receives the PS / 2 channel reset command, it immediately responds to complete the PS / 2 channel handshake operation.

4. The multi-PS / 2 channel automatic dimming keyboard according to claim 1, characterized in that: The multi-PS / 2 channel automatic dimming module receives keyboard key information, quickly identifies the action key by performing row and column scanning on the keyboard, converts the key information into the corresponding keyboard key value, encodes it according to the PS / 2 protocol, and based on the encoded PS / 2 signal and the PS / 2 channel switching switch signal state, determines to output a single PS / 2 signal or simultaneously output multiple PS / 2 signals, wherein the PS / 2 signal includes a clock signal and a data signal.

5. The multi-PS / 2 channel automatic dimming keyboard according to claim 1, characterized in that: The multi-PS / 2 channel automatic dimming module receives the signal of the manual dimming knob and the automatic dimming signal of the external photosensor. Among them, the automatic dimming signal is prioritized by default. If a change in the manual knob dimming signal is detected, the automatic dimming function is shielded and the manual dimming mode is entered. If the manual dimming knob switch is turned off, the automatic dimming mode is restored.

6. The multi-PS / 2 channel automatic dimming keyboard according to claim 1, characterized in that: The signal of the manual dimming knob is an encoder pulse signal. When the knob is rotated clockwise, a positive phase pulse is output, and the automatic dimming module increases the output PWM duty cycle. When the knob is rotated counterclockwise, a negative phase pulse is output, and the automatic dimming module decreases the output PWM duty cycle. The PWM duty cycle changes nonlinearly according to the brightness requirements, and is used to ensure the maximum brightness, minimum brightness and brightness level of the key backlight.

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