CN112130797B - Internal and external display switching circuit suitable for notebook - Google Patents
Internal and external display switching circuit suitable for notebook Download PDFInfo
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- CN112130797B CN112130797B CN202011005231.3A CN202011005231A CN112130797B CN 112130797 B CN112130797 B CN 112130797B CN 202011005231 A CN202011005231 A CN 202011005231A CN 112130797 B CN112130797 B CN 112130797B
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- 238000006243 chemical reaction Methods 0.000 claims description 26
- 230000008030 elimination Effects 0.000 claims description 12
- 238000003379 elimination reaction Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000012986 modification Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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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
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
- G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
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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
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention relates to an internal and external display switching circuit suitable for a notebook, and relates to the technical field of computers. According to the invention, the internal display and the external display can be respectively converted into dual-link LVDS signals through mutual coordination among a plurality of parts of circuits, and the LVDS switching module is controlled to switch internal and external displays through the key triggering anti-shake and logic control module outputting switching signals. The invention has simple circuit and high reliability, and realizes the function of strengthening the internal and external display switching of the notebook computer with minimum modification.
Description
Technical Field
The invention relates to the technical field of computers, in particular to an internal and external display switching circuit suitable for a notebook.
Background
Miniaturization and portability of weaponry are the foundation of future development, and the development of a cloud and terminal mode of an information system enables terminal products such as portable notebooks and the like to be widely applied to the information system. The portable notebook can conveniently carry out work by taking the screen and the keyboard, but the screen of the portable notebook can only display local internal display information.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems that: how to make the reinforced notebook have the function of displaying inside and outside.
(II) technical scheme
In order to solve the technical problems, the invention provides an internal and external display switching circuit suitable for a notebook, which comprises an internal display conversion processing module, an external display conversion module, a display switching module, a key triggering shake eliminating and logic control module;
the internal display conversion module is used for converting an internal output signal of the display card, namely a DP signal, into a double-link LVDS interface signal for an internal display screen;
the external display conversion module is used for converting an HDMI signal input from outside into a double-link LVDS signal displayed by the external input;
the display switching module is used for switching the double-chain LVDS signals displayed in the interior and the double-chain LVDS signals input and displayed in the exterior under the control of the switching control signals, and finally outputting the signals to a screen end;
and the key triggering jitter elimination and logic control module is used for performing hardware jitter elimination processing when the key is pressed, and finally transmitting a switching control signal to the display switching module.
Preferably, the internal display conversion module comprises a DP-to-HDMI module and an HDMI-to-LVDS module; the DP-HDMI module is used for converting the DP signal into an HDMI signal; the HDMI-to-LVDS module is used for converting HDMI signals into double-link LVDS signals.
Preferably, the HDMI-to-LVDS module is implemented using an LT8619C chip.
Preferably, the DP-to-HDMI module is realized by a SN75DP139 chip,
preferably, the design of the external display conversion module is consistent with the HDMI-to-LVDS module in the internal display conversion module.
Preferably, the display switching module is implemented by connecting two chips PI3LVDS512 in parallel, and the control pin lines of the two chips and the control signal of the display switching module are formed later, when the control signal is high, the internal display is displayed, and when the control pin is low, the external display is output.
Preferably, the key triggering debounce and logic control module comprises: the switching key SW1, the isolation diode V1, the hardware anti-shake circuit D3, the D trigger D1, the AND gate D2 and the bypass capacitor C1;
the external trigger signal LCD_SWITCH is connected to a pin 2 of a D3, namely an IN input signal, is connected to a clock input pin of the D1, namely a pin 3 after being output from an output pin 3 of the D3 after being subjected to hardware jitter elimination, outputs a switching control signal, namely a Q signal, from a pin 5 of the D1 to a display switching module, simultaneously outputs the switching control signal to pins 1 and 2 of the D2, and outputs a switching control indicator lamp signal from a pin 4 of the D2 after driving is increased; wherein, D2 plays a role in increasing driving capability, 1 pin and 2 pin of D2 are connected in short circuit and then connected with a switching control signal, a switching control indicator lamp signal is output and used for lighting an external switching indicator lamp of a notebook computer, C1 is placed close to D2 and plays a role in stabilizing power supply input;
preferably, the external trigger signal lcd_switch is active low, when the SWITCH button SW1 is pressed, the lcd_switch signal is low, the IN input signal point position logic of D3 is low after V1 clamping, D3 can filter and shape the pulsed trigger signal into a clean falling edge signal, the clean falling edge signal is output to D1, the preset value PRE of D1 is logic high, when the first power-on or reset is performed, the D1 outputs a Q signal to be logic high, the Q is not logic low according to the logic truth table of D1, the Q non-output is introduced into the D input of D1, the rising edge is generated as the clock signal CLK signal of D1 after SW1 is pressed down, the Q signal is logic low, and the Q is not logic high; after the SW1 is pressed down again, the logic output of the truth table according to the D1 is reversed, and the Q signal output by the D1 is used as a switching control signal to be output to the display switching module, so that the display switching is realized.
Preferably, the hardware jitter removing circuit D3 is a MAX6816 mechanical key hardware jitter removing circuit.
The invention also provides an application of the circuit in the technical field of computers.
(III) beneficial effects
According to the invention, the internal display and the external display can be respectively converted into dual-link LVDS signals through mutual coordination among a plurality of parts of circuits, and the LVDS switching module is controlled to switch internal and external displays through the key triggering anti-shake and logic control module outputting switching signals. The invention has simple circuit and high reliability, and realizes the function of strengthening the internal and external display switching of the notebook computer with minimum modification.
Drawings
FIG. 1 is a schematic diagram of a system implementation framework of the present invention;
FIG. 2 is a circuit diagram of a switching module according to the present invention;
FIG. 3 is a circuit diagram of a key-press triggering debounce module according to the present invention;
fig. 4 is a schematic diagram of a key triggering jitter elimination module according to the present invention.
Detailed Description
For the purposes of clarity, content, and advantages of the present invention, a detailed description of the embodiments of the present invention will be described in detail below with reference to the drawings and examples.
The invention provides an internal and external display switching circuit suitable for a notebook, which comprises an internal display conversion processing module, an external display conversion module, a display switching module and a key triggering jitter elimination and logic control module, wherein the implementation block diagram of the internal and external display switching circuit is shown in figure 1.
The internal display conversion module is used for converting an internal output signal of the display card, namely a DP signal, into a double-link LVDS interface signal for an internal display screen;
the external display conversion module is used for converting an HDMI signal input from outside into a double-link LVDS signal displayed by the external input;
the display switching module is used for switching the double-chain LVDS signals displayed in the interior and the double-chain LVDS signals input and displayed in the exterior under the control of the switching control signals, and finally outputting the signals to a screen end;
and the key triggering jitter elimination and logic control module is used for performing hardware jitter elimination processing when the key is pressed, and finally transmitting a switching control signal to the display switching module.
The internal display conversion module comprises a DP-HDMI module and an HDMI-LVDS module; the display card is generally used for outputting DP signals when outputting the signals, so that display conversion is needed, the DP-to-HDMI module is realized by adopting an SN75DP139 chip and is used for converting the DP signals into HDMI1.4 standard signals, 1920 x 1080@60Hz resolution is supported, and meanwhile, the signal driving capability is increased; the HDMI-to-LVDS module is used for converting HDMI1.4 standard signals to enable the HDMI standard signals to be finally output to a display screen, and the display screen interface is a double-link LVDS interface, so that the signals are required to be finally converted into double-link LVDS signals; the display card internal output signal is converted into an internal display HDMI signal through the DP-HDMI conversion module, and the HDMI-LVDS conversion module converts the internal display HDMI signal into a double-link LVDS signal. The HDMI-to-LVDS module in the circuit is realized by adopting a domestic LT8619C chip of Dragon's company, and converts an internal display HDMI signal into a double-chain LVDS signal of VESA standard.
The function of the external display conversion module is to convert an external input HDMI signal into an LVDS signal, and the design of the external display conversion module is consistent with that of an HDMI-to-LVDS conversion module in the internal display conversion module.
The display switching module has the function of switching the double-link LVDS signals displayed in the interior and the double-link LVDS signals input and displayed in the exterior under the control of the switching control signal so as to realize the switching of the internal display and the external display. The main chip of the display switching module is PI3LVDS512, the chip is a 5-channel multiplexing/demultiplexing analog switch, the highest frequency of the chip is 870MHz, and the signal integrity after switching can be ensured. Meanwhile, the built-in ESD protection circuit of the chip can provide 12KV ESD protection function. The double-link LVDS signals comprise ten pairs of differential pairs including LVDS0[0:3 ]. + -., LVDS0CLK ]. + -., LVDS1[0:3 ]. + -., LVDS1 CLK.+ -., and the display switching module is used for parallelly connecting two PI3LVDS512, so that the double-link LVDS signal switching function can be realized. The control pin wires of the two chips and the control signals of the display switching module are formed later, when the control signals are high, internal display is displayed, and when the control pins are low, external display is output. A specific circuit implementation is shown in fig. 2.
As shown in fig. 3, the key triggering debounce and logic control module includes: the switching key SW1, the isolation diode V1 and the MAX6816 mechanical key hardware jitter elimination circuit D3, the D trigger D1, the AND gate D2 and the bypass capacitor C1;
referring to fig. 3 and 4, a signal lcd_switch is connected to pin 2 of D3, i.e., an IN input signal, after passing through V1, and after being output from output pin 3 of D3 after being subjected to hardware jitter elimination, is connected to clock input pin of D1, i.e., pin 3, and outputs a switching control signal, i.e., a Q signal, from pin 5 of D1 to a display switching module, and simultaneously outputs a switching control signal to pins 1 and 2 of D2, and outputs a switching control indicator signal from pin 4 of D2 after driving is increased; wherein, D2 plays the effect of increasing driving capability, inserts switching control signal after shorting 1, 2 pins of D2, and output switching control pilot lamp signal for the notebook outside switching pilot lamp lights up, and C1 is placed near D2, plays the effect of stable power input.
When the SWITCH button SW1 is pressed, the LCD_SWITCH signal is low, the IN input signal point of D3 is about 0.7V after being clamped by the isolation diode V1, the logic is low, and V1 plays a role IN preventing static electricity and circuit damage caused by too high input voltage due to unreasonable design of an external circuit. D3 can filter and shape the pulse trigger signal into a pure falling edge signal, and output the pure falling edge signal to D1, wherein a preset value PRE of D1 is logic high, when the pulse trigger signal is powered on or reset for the first time, according to a logic truth table of D1, a Q signal is output by D1 and is logic high, a Q non-logic low, a Q non-output is introduced into a D input of D1, a rising edge is generated as a clock signal CLK signal of D1 after SW1 is pressed down and released, a Q signal is output and is logic low, and a Q non-logic high; after the SW1 is pressed down again, the logic output of the truth table according to the D1 is reversed, and the Q signal output by the D1 is used as a switching control signal to be output to the display switching module, so that the display switching is realized.
In summary, after the SW1 is pressed, the trigger signal is sent to the D1 after passing through the D3, and the D1 outputs the switching control signal to the control end of the display switching module, so that the internal and external display switching is realized.
The invention can realize the function of adding a display to the screen of the notebook, so that the screen can be switched to display external input display information, thereby realizing the switching between internal and external display, ensuring that the reinforced notebook has the capability of displaying external input besides displaying local content, and the local and external input display resolutions can reach 1920 x 1080. By utilizing the function, the reinforced notebook can play the role of a display in the special application fields of vehicle-mounted, vehicle-mounted and the like, thereby saving space and weight resources.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (9)
1. The internal and external display switching circuit suitable for the notebook is characterized by comprising an internal display conversion processing module, an external display conversion module, a display switching module and a key triggering jitter elimination and logic control module;
the internal display conversion module is used for converting an internal output signal of the display card, namely a DP signal, into a double-link LVDS interface signal for an internal display screen;
the external display conversion module is used for converting an HDMI signal input from outside into a double-link LVDS signal displayed by the external input;
the display switching module is used for switching the double-chain LVDS signals displayed in the interior and the double-chain LVDS signals input and displayed in the exterior under the control of the switching control signals, and finally outputting the signals to a screen end;
the key triggering anti-shake and logic control module is used for performing hardware anti-shake processing when the key is monitored to be pressed down, and finally transmitting a switching control signal to the display switching module;
the key triggering jitter elimination and logic control module comprises: the switching key SW1, the isolation diode V1, the hardware anti-shake circuit D3, the D trigger D1, the AND gate D2 and the bypass capacitor C1;
the external trigger signal LCD_SWITCH is connected to a pin 2 of a D3, namely an IN input signal, is connected to a clock input pin of the D1, namely a pin 3 after being output from an output pin 3 of the D3 after being subjected to hardware jitter elimination, outputs a switching control signal, namely a Q signal, from a pin 5 of the D1 to a display switching module, simultaneously outputs the switching control signal to pins 1 and 2 of the D2, and outputs a switching control indicator lamp signal from a pin 4 of the D2 after driving is increased; wherein, D2 plays the effect of increasing driving capability, inserts switching control signal after shorting 1, 2 pins of D2, and output switching control pilot lamp signal for the notebook outside switching pilot lamp lights up, and C1 is placed near D2, plays the effect of stable power input.
2. The circuit of claim 1, wherein the internal display conversion module comprises a DP to HDMI module, an HDMI to LVDS module; the DP-HDMI module is used for converting the DP signal into an HDMI signal; the HDMI-to-LVDS module is used for converting HDMI signals into double-link LVDS signals.
3. The circuit of claim 2, wherein the HDMI-to-LVDS module is implemented using a LT8619C chip.
4. The circuit of claim 2, wherein the DP to HDMI module is implemented using a SN75DP139 chip.
5. The circuit of claim 2, wherein the external display conversion module is designed to be identical to the HDMI-to-LVDS module in the internal display conversion module.
6. The circuit of claim 1, wherein the display switching module is implemented by two chips PI3LVDS512 connected in parallel, and control pins of the two chips and a control signal of the display switching module are configured later, and when the control signal is high, an internal display is displayed, and when the control pin is low, an external display is output.
7. The circuit of claim 1 wherein the external trigger signal lcd_switch is active low, the lcd_switch signal is active low when the SWITCH button SW1 is pressed, the IN input signal point of D3 is active low after clamping by V1, D3 filters and shapes the pulsed trigger signal to a clean falling edge signal, the clean falling edge signal is output to D1, the preset value PRE of D1 is active high, the D1 output Q signal is active high when the SWITCH button SW1 is first powered up or reset, the Q is not active low, the Q is active low when the SWITCH button SW1 is pressed to be released to generate a rising edge as the clock signal CLK signal of D1, the Q is active low, and the Q is not active high; after the SW1 is pressed down again, the logic output of the truth table according to the D1 is reversed, and the Q signal output by the D1 is used as a switching control signal to be output to the display switching module, so that the display switching is realized.
8. The circuit of claim 1, wherein the hardware debounce circuit D3 is a MAX6816 mechanical key hardware debounce circuit.
9. Use of a circuit according to any one of claims 1 to 8 in the field of computer technology.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011005231.3A CN112130797B (en) | 2020-09-22 | 2020-09-22 | Internal and external display switching circuit suitable for notebook |
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| CN202011005231.3A CN112130797B (en) | 2020-09-22 | 2020-09-22 | Internal and external display switching circuit suitable for notebook |
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| CN112130797B true CN112130797B (en) | 2024-01-30 |
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