CN112130797A - Internal and external display switching circuit suitable for notebook computer - Google Patents
Internal and external display switching circuit suitable for notebook computer Download PDFInfo
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- CN112130797A CN112130797A CN202011005231.3A CN202011005231A CN112130797A CN 112130797 A CN112130797 A CN 112130797A CN 202011005231 A CN202011005231 A CN 202011005231A CN 112130797 A CN112130797 A CN 112130797A
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- 239000003990 capacitor Substances 0.000 claims description 3
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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
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- 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
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Abstract
The invention relates to an internal and external display switching circuit suitable for a notebook computer, and relates to the technical field of computers. The invention can respectively convert the internal display and the external display into dual-link LVDS signals through the mutual cooperation of a plurality of circuits, and the key triggers the jitter elimination and logic control module to output the switching signal to control the LVDS switching module to switch the internal display and the external display. The circuit of the invention is simple and has high reliability, and the function of switching the internal display and the external display of the reinforced notebook computer is realized with the minimum change.
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 computer.
Background
Miniaturization and portability of weaponry are the basis of future development, and development of a cloud + 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 being provided with a screen and a keyboard, but the screen of the portable notebook can only display local internal display information at present.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to enable the reinforced notebook to have the function of internal and external display.
(II) technical scheme
In order to solve the technical problem, the invention provides an internal and external display switching circuit suitable for a notebook computer, which comprises an internal display processing conversion 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 internal output signals of the display card, namely DP signals, into dual-link LVDS interface signals for internal display and screens;
the external display conversion module is used for converting an externally input HDMI signal into an externally input and displayed double-link LVDS signal;
the display switching module is used for switching the internally displayed double-link LVDS signals and the externally input and displayed double-link LVDS signals under the control of a switching control signal and finally outputting the signals to a screen end;
the key triggering jitter elimination and logic control module is used for monitoring that the key is pressed down, performing hardware jitter elimination processing 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-to-HDMI module is used for converting a DP signal into an HDMI signal; the HDMI-to-LVDS module is used for converting the HDMI signal into a double-link LVDS signal.
Preferably, the HDMI-to-LVDS module is implemented by using an LT8619C chip.
Preferably, the DP to HDMI module is implemented by using an SN75DP139 chip,
preferably, the external display conversion module is designed in accordance 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, control pin lines of the two chips and a control signal of the display switching module are formed afterwards, when the control signal is high, an internal display is displayed, and when the control pin is low, an external display is output.
Preferably, the key triggering jitter elimination and logic control module includes: the switching key SW1, the isolating diode V1, the hardware jitter elimination circuit D3, the D trigger D1, the AND gate D2 and the bypass capacitor C1;
an external trigger signal LCD _ SWITCH is connected to a pin 2 of D3, namely an IN input signal, after passing through V1, is connected to a clock input pin of D1, namely a pin 3, after being output from an output pin 3 of D3 after hardware jitter elimination, is connected to a pin 5 of D1, outputs a switching control signal, namely a Q signal, to a display switching module, simultaneously outputs the switching control signal to pins 1 and 2 of D2, and outputs a switching control indicator lamp signal from a pin 4 of D2 after increasing drive; the D2 has the function of increasing the driving capability, the 1 pin and the 2 pin of the D2 are connected with the switching control signal after being short-circuited, the switching control indicator light signal is output and used for lighting the external switching indicator light of the notebook, and the C1 is arranged close to the D2 and has the function of stabilizing the power supply input;
preferably, the external trigger signal LCD _ SWITCH is active low, when the SWITCH SW1 is pressed, the LCD _ SWITCH signal is low, the IN input signal point logic of D3 is low after being clamped by V1, D3 can filter and shape the pulsating trigger signal into a pure falling edge signal, the pure falling edge signal is output to D1, the preset value PRE of D1 is logic high, when the external trigger signal LCD _ SWITCH is first powered on or reset, according to the logic truth table of D1, the Q signal output by D1 is logic high, the Q signal is logic low, the Q non-output is introduced into the D input of D1, after SW1 is pressed and released, the rising edge is generated as the clock signal CLK of D1, the Q signal is logic low, and the Q non is logic high; after the SW1 is pressed again, the logic output is reversed according to the truth table of the D1, and the Q signal output by the D1 is output to the display switching module as a switching control signal, so that the display switching is realized.
Preferably, the hardware debounce circuit D3 is a MAX6816 mechanical key hardware debounce circuit.
The invention also provides an application of the circuit in the technical field of computers.
(III) advantageous effects
The invention can respectively convert the internal display and the external display into dual-link LVDS signals through the mutual cooperation of a plurality of circuits, and the key triggers the jitter elimination and logic control module to output the switching signal to control the LVDS switching module to switch the internal display and the external display. The circuit of the invention is simple and has high reliability, and the function of switching the internal display and the external display of the reinforced notebook computer is realized with the minimum change.
Drawings
FIG. 1 is a schematic diagram of a system implementation framework of the present invention;
FIG. 2 is a circuit diagram of a display switch module according to the present invention;
FIG. 3 is a circuit diagram of a key-triggered jitter reduction module according to the present invention;
fig. 4 is a schematic diagram of a key-triggered jitter elimination module according to the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The internal and external display switching circuit suitable for the notebook computer comprises an internal display processing conversion module, an external display conversion module, a display switching module and a key triggering jitter elimination and logic control module, and an implementation block diagram of the internal and external display switching circuit is shown in fig. 1.
The internal display conversion module is used for converting internal output signals of the display card, namely DP signals, into dual-link LVDS interface signals for internal display and screens;
the external display conversion module is used for converting an externally input HDMI signal into an externally input and displayed double-link LVDS signal;
the display switching module is used for switching the internally displayed double-link LVDS signals and the externally input and displayed double-link LVDS signals under the control of a switching control signal and finally outputting the signals to a screen end;
the key triggering jitter elimination and logic control module is used for monitoring that the key is pressed down, performing hardware jitter elimination processing and finally transmitting a switching control signal to the display switching module.
The internal display conversion module comprises a DP to HDMI conversion module and an HDMI to LVDS conversion module; the DP-to-HDMI module is realized by adopting an SN75DP139 chip and is used for converting the DP signal into an HDMI1.4 standard signal, supporting 1920 x 1080@60Hz resolution and increasing signal driving capability; the HDMI-to-LVDS module is used for converting an HDMI1.4 standard signal to finally output the signal to a display screen, and an interface of the display screen is a double-link LVDS interface, so that the signal needs to be finally converted into a double-link LVDS signal; the internal output signal of the display card is converted into an internal display HDMI signal through the DP-to-HDMI conversion module, and the internal display HDMI signal is converted into a double-link LVDS signal through the HDMI-to-LVDS conversion module. The HDMI-to-LVDS module in the circuit is realized by adopting a domestic LT8619C chip of the dragon communication company, and an internal display HDMI signal is converted into a double-link LVDS signal of the VESA standard.
The external display conversion module has the function of converting an externally input HDMI signal into an LVDS signal, and the design of the external display conversion module is consistent with that of the HDMI-to-LVDS module in the internal display conversion module.
The display switching module has the function of switching the internally displayed double-link LVDS signals and the externally input displayed double-link LVDS signals under the control of the switching control signal so as to realize the switching of internal and external display. The main chip of the display switching module is PI3LVDS512, the chip is a 5-channel multiplexing/demultiplexing analog switch, the highest passing frequency of the chip is 870MHz, and the integrity of the switched signals can be guaranteed. Meanwhile, the built-in ESD protection circuit of the chip can provide an ESD protection function of 12 KV. The double-link LVDS signals comprise ten pairs of differential pairs of LVDS0[0:3] +/-, LVDS0CLK +/-, LVDS1[0:3] +/-, LVDS1CLK +/-, and the display switching module is used for connecting two pieces of PI3LVDS512 in parallel, so that the double-link LVDS signal switching function can be realized. The control pin lines of the two chips and the control signal of the display switching module are formed, when the control signal is high, the internal display is displayed, and when the control pin is low, the external display is output. The specific circuit implementation is shown in fig. 2.
As shown in fig. 3, the key-triggered jitter elimination and logic control module includes: a switching key SW1, an isolation diode V1, a MAX6816 mechanical key hardware jitter elimination circuit D3, a D trigger D1, an AND gate D2 and a bypass capacitor C1;
referring to fig. 3 and 4, the signal LCD _ SWITCH is connected to the pin 2 of D3, i.e., IN input signal, after passing through V1, and is connected to the clock input pin of D1, i.e., pin 3, after being output from the output pin 3 of D3 after hardware jitter is removed, and outputs the switching control signal, i.e., Q signal, to the display switching module from the pin 5 of D1, and outputs the switching control signal to the pins 1 and 2 of D2, and outputs the switching control indicator light signal from the pin 4 of D2 after increased driving; the D2 has the function of increasing the driving capability, the 1 and 2 pins of the D2 are connected with the switching control signal after being short-circuited, the switching control indicator light signal is output and used for turning on the external switching indicator light of the notebook, and the C1 is placed close to the D2 and has the function of stabilizing the power supply input.
The external trigger signal LCD _ SWITCH is low and effective, when the SWITCH key 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 the V1 plays a role IN preventing the circuit damage caused by overhigh input voltage due to static electricity and unreasonable external circuit design. D3 can filter and shape the pulsating trigger signal into a pure falling edge signal, output the pure falling edge signal to D1, the preset value PRE of D1 is logic high, after first power-on or reset, according to the logic truth table of D1, the Q signal output by D1 is logic high, the Q is not logic low, the Q is not output and is introduced into the D input of D1, after SW1 is pressed down and released, the rising edge is generated to be used as the clock signal CLK of D1, the output Q signal is logic low, and the Q is logic high; after the SW1 is pressed again, the logic output is reversed according to the truth table of the D1, and the Q signal output by the D1 is output to the display switching module as a switching control signal, so that the display switching is realized.
In summary, after the SW1 is pressed down, 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, thereby realizing the switching between the internal display and the external display.
The invention can realize the function of adding a display to the screen of the notebook computer, so that the screen can be switched to display external input display information, thereby realizing the switching of internal and external display, ensuring that the reinforced notebook computer has the capability of displaying external input besides displaying local content, and the display resolution of the local input and the external input can reach 1920 x 1080. By utilizing the function, the reinforced notebook can play a role of a display in the special application fields of vehicle-mounted and airborne and the like, so that space and weight resources are saved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An internal and external display switching circuit suitable for a notebook computer is characterized by comprising an internal display processing conversion 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 internal output signals of the display card, namely DP signals, into dual-link LVDS interface signals for internal display and screens;
the external display conversion module is used for converting an externally input HDMI signal into an externally input and displayed double-link LVDS signal;
the display switching module is used for switching the internally displayed double-link LVDS signals and the externally input and displayed double-link LVDS signals under the control of a switching control signal and finally outputting the signals to a screen end;
the key triggering jitter elimination and logic control module is used for monitoring that the key is pressed down, performing hardware jitter elimination processing and finally transmitting a switching control signal to the display switching module.
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-to-HDMI module is used for converting a DP signal into an HDMI signal; the HDMI-to-LVDS module is used for converting the HDMI signal into a double-link LVDS signal.
3. The circuit of claim 2, wherein the HDMI-to-LVDS module is implemented with an LT8619C chip.
4. The circuit of claim 2, wherein the DP to HDMI block is implemented using an SN75DP139 chip.
5. The circuit of claim 2, wherein the external display conversion module is designed in accordance with 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 connecting two chips PI3LVDS512 in parallel, and control pins of the two chips and a control signal of the display switching module are configured to display an internal display when the control signal is high and output an external display when the control pin is low.
7. The circuit of claim 1, wherein the key-activated debounce and logic control module comprises: the switching key SW1, the isolating diode V1, the hardware jitter elimination circuit D3, the D trigger D1, the AND gate D2 and the bypass capacitor C1;
an external trigger signal LCD _ SWITCH is connected to a pin 2 of D3, namely an IN input signal, after passing through V1, is connected to a clock input pin of D1, namely a pin 3, after being output from an output pin 3 of D3 after hardware jitter elimination, is connected to a pin 5 of D1, outputs a switching control signal, namely a Q signal, to a display switching module, simultaneously outputs the switching control signal to pins 1 and 2 of D2, and outputs a switching control indicator lamp signal from a pin 4 of D2 after increasing drive; the D2 has the function of increasing the driving capability, the 1 and 2 pins of the D2 are connected with the switching control signal after being short-circuited, the switching control indicator light signal is output and used for turning on the external switching indicator light of the notebook, and the C1 is placed close to the D2 and has the function of stabilizing the power supply input.
8. The circuit of claim 7, wherein the external trigger signal LCD _ SWITCH is active low, when the SWITCH SW1 is pressed, the LCD _ SWITCH signal is low, after being clamped by V1, the IN input signal point of D3 is low, D3 can filter and shape the pulsating trigger signal into a pure falling edge signal, and output the pure falling edge signal to D1, the preset value PRE of D1 is logic high, when being first powered on or reset, according to the logic truth table of D1, D1 outputs a Q signal of logic high and a Q not of logic low, the Q not output is introduced to the D input of D1, after being pressed down SW1 to release, a rising edge is generated as the clock signal CLK of D1, and the Q signal is logic low and is logic high; after the SW1 is pressed again, the logic output is reversed according to the truth table of the D1, and the Q signal output by the D1 is output to the display switching module as a switching control signal, so that the display switching is realized.
9. The circuit of claim 7, wherein the hardware debounce circuit D3 is a MAX6816 mechanical key hardware debounce circuit.
10. Use of a circuit according to any of claims 1 to 9 in the field of computer technology.
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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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