CN115202602A - Display screen wake-up circuit - Google Patents
Display screen wake-up circuit Download PDFInfo
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- CN115202602A CN115202602A CN202211112761.7A CN202211112761A CN115202602A CN 115202602 A CN115202602 A CN 115202602A CN 202211112761 A CN202211112761 A CN 202211112761A CN 115202602 A CN115202602 A CN 115202602A
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- 230000005540 biological transmission Effects 0.000 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
- G06F3/1454—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
Abstract
The embodiment of the invention discloses a display screen wake-up circuit, which comprises: the host computer end comprises a first filter circuit and a host computer MCU (microprogrammed control Unit), and the first filter circuit is respectively connected with the video signal line and the host computer MCU; the display screen end comprises a second filter circuit and a display screen MCU, and the second filter circuit is respectively connected with the video signal line and the display screen MCU; the first filter circuit is used for filtering a signal returned after the display screen MCU is awakened, the second filter circuit is used for filtering a high-frequency interference signal to prevent the awakening pulse signal from being triggered, and the host MCU is used for generating the awakening pulse signal and transmitting the awakening pulse signal to the display screen end through the first filter circuit and the video signal line in sequence to awaken the display screen MCU. The invention solves the technical problem that a hard wire is additionally arranged to wake up the system screen, and simultaneously ensures that the video signal and the wake-up pulse signal do not exist at the same time and the video signal is not interfered.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a display screen wake-up circuit.
Background
In a vehicle-mounted system with a host and a screen separated from each other, such as a vehicle-mounted entertainment system, a domain controller, an instrument and the like, when a vehicle does not run or locks the vehicle at night, the screen of the system does not need to work, and the system enters a dormant state at the moment so as to save power consumption.
At present, when a screen of a system needs to be woken up, a hard wire needs to be adopted, and a hard wire needs to be led out from a host end to enter a socket connector of the screen so as to enable a wake-up signal to enter the screen to wake up the screen of the system. The method not only adds one more hard wire to cause cost increase, but also the hard wire is easy to be interfered when the whole vehicle is wired, and simultaneously the hard wire needs to add a pair of connectors at the host computer end and the display screen end to cause the structure of the host computer and the screen to be changed.
Therefore, how to wake up the system screen without adding an additional hard wire is a technical problem to be solved urgently.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a display screen awakening circuit, aiming at solving the technical problem that a hard wire needs to be additionally arranged to awaken a system screen in the prior art.
To solve the above problem, an embodiment of the present invention provides a display screen wake-up circuit, which includes:
the host computer end comprises a first filter circuit and a host computer MCU (microprogrammed control Unit), and the first filter circuit is respectively connected with a video signal line and the host computer MCU;
the display screen end comprises a second filter circuit and a display screen MCU, and the second filter circuit is respectively connected with the video signal line and the display screen MCU;
the first filter circuit is used for filtering a signal returned after the display screen MCU is awakened, the second filter circuit is used for filtering a high-frequency interference signal to prevent triggering of an awakening pulse signal, and the host MCU is used for generating the awakening pulse signal and transmitting the awakening pulse signal to the display screen end through the first filter circuit and the video signal line in sequence to awaken the display screen MCU.
Preferably, in the display screen wake-up circuit, the host end further includes a first switch circuit, and the first switch circuit is connected to the host MCU and the first filter circuit, respectively.
More preferably, in the display screen wake-up circuit, the first switch circuit includes: MOS tube Q1 and triode Q2;
the source electrode of the MOS transistor Q1 is connected to a first voltage source, the grid electrode of the MOS transistor Q1 is connected with the collector electrode of the triode, and the drain electrode of the MOS transistor Q1 is connected with the first filter circuit;
and the base electrode of the triode Q2 is connected with the MCU of the host computer, and the emitting electrode is grounded.
Preferably, in the display screen wake-up circuit, the first filter circuit and the second filter circuit are both RC filter circuits.
More preferably, in the display screen wake-up circuit, the first filter circuit includes: a resistor R13 and a capacitor C9;
one end of the resistor R13 is connected with the video signal line, and the other end of the resistor R13 is connected with the host MCU and is grounded through the capacitor C9.
More preferably, in the display screen wake-up circuit, the second filter circuit includes a third filter circuit and a fourth filter circuit;
the third filter circuit is respectively connected with the video signal line and the fourth filter circuit, and the fourth filter circuit is connected with the display screen MCU.
More preferably, in the display screen wake-up circuit, the third filter circuit includes: a resistor R8 and a capacitor C7;
one end of the resistor R8 is connected with the video signal line, and the other end of the resistor R8 is connected with the fourth filter circuit and is grounded through the capacitor C7.
More preferably, in the display screen wake-up circuit, the fourth filter circuit includes: a resistor R9 and a capacitor C8;
one end of the resistor R9 is connected with the video signal line through the third filter circuit, and the other end of the resistor R9 is connected with the display screen MCU and is grounded through the capacitor C8.
Preferably, in the display screen wake-up circuit, the display screen end further includes a second switch circuit, and the second switch circuit is connected to the display screen MCU and connected to the video signal line through the second filter circuit.
More preferably, in the display screen wake-up circuit, the second switch circuit includes: MOS transistor Q3 and MOS transistor Q4;
the grid electrode of the MOS tube Q3 is connected with the video signal line through the second filter circuit, the drain electrode of the MOS tube Q3 is connected with the display screen MCU and is connected to a second voltage source, and the source electrode of the MOS tube Q3 is grounded;
and the drain electrode of the MOS tube Q4 is connected with the display screen MCU and is connected with a second voltage source, the grid electrode is connected with the second voltage source, and the source electrode is grounded.
Compared with the prior art, in the display screen wake-up circuit provided by the embodiment of the invention, the host MCU is connected with the display screen MCU through the video signal line, the wake-up pulse signal generated by the host MCU can be directly transmitted to the display screen MCU through the video signal line to wake up the screen of the system, and meanwhile, a filter circuit is respectively added between the host MCU and the video signal line and between the display screen MCU and the video signal line, so that not only can the video signal and the wake-up pulse signal not exist simultaneously, but also the video signal is not interfered.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a circuit block diagram of a prior art for implementing display wakeup;
fig. 2 is a schematic diagram of a circuit for implementing display screen wakeup in the prior art according to an embodiment of the present invention;
fig. 3 is a block diagram of a display screen wake-up circuit according to an embodiment of the present invention;
fig. 4 is a block diagram of a display screen wake-up circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a display screen wake-up circuit according to an embodiment of the present invention;
fig. 6 is a timing diagram of a display wake-up circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
Referring to fig. 1 and fig. 2, fig. 1 is a circuit block diagram of a prior art for implementing display screen wake-up; fig. 2 is a schematic diagram of a circuit for implementing display screen wakeup in the prior art according to an embodiment of the present invention. As shown in fig. 1 and fig. 2, a wake-up signal line is connected between the host MCU101 and the display MCU201, the signal line is led out from the connector J3 of the host end 10 and connected to the connector J4 of the display end 20, and the whole system needs a wiring harness, two connectors and an interface circuit to wake up the screen of the system.
In the specific embodiment shown in fig. 2, when the screen of the system needs to be woken up, the pin MCU-wake up of the host MCU101 outputs a wake-up pulse signal, and the wake-up pulse signal is output to the base of the transistor Q2 through the resistor R4, after the transistor Q2 is turned on, the MOS transistor Q1 is also turned on, at this time, the 5V pulse signal is transmitted to the display screen terminal 20 through the wake-up signal line, the gate of the MOS transistor Q3 is turned on, the drain of the MOS transistor Q3 is turned from high level to low level, the gate of the MOS transistor Q4 is turned from low level, the drain of the MOS transistor Q4 is turned from high level, so that the MOS transistor Q4 is turned off, and at the same time, the source of the MOS transistor Q4 outputs a 3.3V wake-up pulse signal to the pin LCD-wake up of the display MCU201, thereby waking up the display MCU201 to achieve the effect of waking up the screen. Although the circuit can achieve the effect of waking up the screen, the circuit is additionally provided with one hard wire, which results in increased cost, and the hard wire is easily interfered when the whole vehicle is wired, and meanwhile, the hard wire needs to be additionally provided with a pair of connectors at the host end 10 and the display screen end 20, which results in the need of changing the structures of the host and the screen.
Referring to fig. 3 and fig. 4, fig. 3 is a block diagram of a display wake-up circuit according to an embodiment of the present invention; fig. 4 is a block diagram of a display screen wake-up circuit according to an embodiment of the present invention. As shown in fig. 3 and 4, a display screen wake-up circuit includes:
the video signal processing device comprises a host end 10, wherein the host end 10 comprises a first filter circuit 102 and a host MCU101, and the first filter circuit 102 is respectively connected with a video signal line 30 and the host MCU 101;
the display screen end 20, the display screen end 20 includes a second filter circuit 202 and a display screen MCU201, and the second filter circuit 202 is connected to the video signal line 30 and the display screen MCU201 respectively;
the first filter circuit 102 is configured to filter a signal returned after the display screen MCU201 is woken up, the second filter circuit 202 is configured to filter a high-frequency interference signal to prevent a wake-up pulse signal from being triggered, and the host MCU101 is configured to generate the wake-up pulse signal and transmit the wake-up pulse signal to the display screen 20 through the first filter circuit 102 and the video signal line 30 in sequence to wake up the display screen MCU201.
In the display screen wake-up circuit provided by the embodiment of the invention, the host MCU101 is connected with the display screen MCU201 through the video signal line 30, the wake-up pulse signal generated by the host MCU101 can be directly transmitted to the display screen MCU201 through the video signal line 30 to wake up the screen of the system, and meanwhile, a filter circuit is respectively added between the host MCU101 and the video signal line 30 and between the display screen MCU201 and the video signal line 30, so that not only can the video signal and the wake-up pulse signal not exist at the same time, but also the video signal is not interfered.
The Video signal line 30 is led out from a connector J1 of the host end 10 and connected to a connector J2 of the display screen end 20, a pin Video + of a Serializer (Serializer) of the host end 10 is connected with the connector J1 through a capacitor C1, the pin Video-is grounded through a capacitor C3 and a resistor R1 in sequence, and a pin VIN is connected to a voltage signal; a pin Video + of a Deserializer (Deserializer) at the display screen end 20 is connected with the connector J2 through a capacitor C2, the pin Video-is grounded through a capacitor C4 and a resistor R2 in sequence, and a pin VIN is connected with a voltage signal.
The wake-up pulse signal generated by the host MCU101 may be superimposed on the video link, and the wake-up pulse signal wakes up the screen of the system before the video signal works, and when the screen of the system is woken up by the wake-up pulse signal, the host MCU101 stops sending the wake-up pulse signal to ensure that the video signal and the wake-up signal do not exist simultaneously, thereby ensuring that the video signal is not interfered.
In some embodiments, the host terminal 10 further comprises a first switch circuit, and the first switch circuit is configured to be connected to the host MCU101 and the first filter circuit 102 respectively.
Specifically, when the screen of the system needs to be woken up, the first switching circuit is turned on by a wake-up pulse signal generated by the host MCU101, and the wake-up pulse signal may sequentially pass through the first filter circuit 102, the video signal line 30, and the second filter circuit 202 and be transmitted to the display screen MCU201, so as to wake up the screen of the system; after the screen of the system is woken up, the host MCU101 stops generating the wake-up pulse signal, and at the moment, the first switch circuit is switched off, so that the video signal and the wake-up signal are ensured not to exist simultaneously. Before the screen of the system is awakened, the first switch circuit is also in a disconnected state.
In some specific embodiments, as shown in fig. 5, the first switching circuit includes: an MOS tube Q1 and a triode Q2; the source electrode of the MOS transistor Q1 is connected to a first voltage source, the grid electrode of the MOS transistor Q1 is connected with the collector electrode of the triode, and the drain electrode of the MOS transistor Q1 is connected with the first filter circuit 102; the base electrode of the triode Q2 is connected with the host MCU101, and the emitting electrode is grounded.
Specifically, the base of the triode Q2 is connected with the pin MCU _ wake of the host MCU101 sequentially through the resistor R5 and the resistor R4, and the base of the triode Q2 is grounded sequentially through the resistor R5 and the capacitor C6. When the screen of the system needs to be woken up, a wake-up pulse signal generated by the host MCU101 is sent out by the pin MCU _ WAKEUP of the host MCU101 and is output to the base electrode of the triode Q2 through the resistor R4 and the resistor R5 in sequence, after the triode Q2 is conducted, the MOS tube Q1 is also conducted, and at the moment, a 5V pulse signal is superposed on the video signal line 30 and is transmitted to the pin LCD-WAKEUP of the display screen MCU201 through the video signal line 30, so that the purpose of waking up the screen of the system is achieved.
The MOS transistor Q1 in this embodiment is preferably a P-channel MOS transistor, the first voltage source is a 5V voltage source, a body diode is connected between the source and the drain of the MOS transistor Q1, the anode of the body diode is connected to the source of the MOS transistor Q1, and the cathode of the body diode is connected to the drain of the MOS transistor Q1.
It can be understood that the MOS transistor Q1 provided in this embodiment of the present application may be a P-channel MOS transistor or an N-channel MOS transistor, and the type of the MOS transistor Q1 may be selected according to practical applications, which is not specifically limited in this embodiment.
In some specific embodiments, as shown in fig. 5, the first filter circuit 102 and the second filter circuit 202 are both RC filter circuits. Specifically, the first filter circuit 102 includes: a resistor R13 and a capacitor C9; one end of the resistor R13 is connected with the video signal line 30, and the other end is connected with the host MCU101 and is grounded through the capacitor C9. The RC filter circuit formed by the resistor R13 and the capacitor C9 can filter the returned signal.
In some specific embodiments, as shown in fig. 5, the second filter circuit 202 includes a third filter circuit and a fourth filter circuit; the third filter circuit is respectively connected with the video signal line 30 and the fourth filter circuit, and the fourth filter circuit is connected with the display screen MCU201. Specifically, the third filter circuit includes: a resistor R8 and a capacitor C7; one end of the resistor R8 is connected to the video signal line 30, and the other end is connected to the fourth filter circuit and grounded through the capacitor C7; the fourth filter circuit includes: a resistor R9 and a capacitor C8; one end of the resistor R9 is connected with the video signal line 30 through the third filter circuit, and the other end of the resistor R9 is connected with the display screen MCU201 and is grounded through the capacitor C8.
The second filter circuit 202 is a second-order RC circuit, and is composed of a third filter circuit and a fourth filter circuit, and the second filter circuit 202 can filter out some high-frequency interference signals, so as to ensure that the screen of the system is not triggered by mistake when in a sleep state.
In some specific embodiments, the display screen terminal 20 further includes a second switch circuit, and the second switch circuit is connected to the display screen MCU201 and is connected to the video signal line 30 through the second filter circuit 202. Specifically, when the screen of the system is in a sleep state, the second switch circuit is in a disconnected state; when the screen of the system needs to be woken up, when a wake-up pulse signal generated by the host MCU101 enters the display screen end 20 through the video signal line 30, the second switch circuit is turned on, and at this time, the wake-up pulse signal can be transmitted to the pin LCD-WAKEUP of the display screen MCU201 through the second switch circuit, so that the purpose of waking up the screen of the system is achieved.
In some gunns embodiments, as shown in fig. 5, said second switch circuit comprises: MOS tube Q3 and MOS tube Q4; the gate of the MOS transistor Q3 is connected to the video signal line 30 through the second filter circuit 202, the drain is connected to the display screen MCU201 and is connected to a second voltage source, and the source is grounded; the drain electrode of the MOS tube Q4 is connected with the display screen MCU201 and is connected to a second voltage source, the grid electrode is connected to the second voltage source, and the source electrode is grounded.
Specifically, the gate of the MOS transistor Q3 is connected to the resistor R9 and the capacitor C8, and is grounded through the capacitor C8, the drain is connected to the display screen MCU201 and is connected to the second voltage source through the resistor R12, and the source is grounded; the grid electrode of the MOS tube Q4 is connected with the drain electrode of the MOS tube Q3 and is connected to a second voltage source through a resistor R12, the drain electrode is connected with the display screen MCU201 and is connected to the second voltage source through a resistor R10, and the source electrode is grounded.
When the screen of the system needs to be woken up, after a wake-up pulse signal generated by the host MCU101 enters the display screen end 20 through the video signal line 30, the MOS tube Q3 is conducted, meanwhile, the low level of the grid of the MOS tube Q4 is cut off, and the source of the MOS tube outputs a wake-up pulse signal of a second voltage source to a pin LCD-WAKEUP of the MUC of the display screen, so that the purpose of waking up the screen of the system is achieved; when the screen of the system is in a water state of 2815639, the MOS tube Q3 is disconnected, the MOS tube Q4 is connected, the grid of the MOS tube Q4 outputs a low level to a pin LCD-WAKEUP of the display screen MUC, and the screen of the system is in a sleep state.
In this embodiment, the MOS transistor Q3 and the MOS transistor Q4 are preferably N-channel MOS transistors, the second voltage source is a 3.3V voltage source, and a body diode is connected between the source and the drain of each of the MOS transistor Q3 and the MOS transistor Q4.
It can be understood that the MOS transistors Q3 and Q4 may be P-channel MOS transistors or N-channel MOS transistors, and the types of the MOS transistors Q3 and Q4 may be selected according to practical applications, which is not specifically limited in this embodiment.
In the embodiment of the present invention, the first voltage source is preferably a 5V voltage source, and the second voltage source is preferably a 3.3V voltage source. Wherein, this application need send triode Q2 through the awakening pulse signal that host computer MCU101 produced, and become 5V awakening pulse signal through handling and give the screen of system, this application so not directly transmits with 3.3V, its main objective is because automobile body part transmission signal of telecommunication amplitude selects 5V level to be better than 3.3V anti-jamming effect, and 5V awakening pulse signal can become a 3.3V pulse and direct transmission to display screen MCU201 department through level conversion at the screen end, display screen MCU201 is awaken the back up, alright open screen end power, serializer and deserializer just begin power supply and communication this moment, thereby guaranteed that the video transmission of screen can not overlap with the awakening signal of screen, and then guaranteed the integrality of video transmission signal.
Referring to fig. 6, fig. 6 is a timing diagram of a display wake-up circuit according to an embodiment of the invention. As shown in fig. 6, after the wake-up pulse signal generated by the host MCU101 is transmitted to the LCD-wake position of the pin of the display MCU201 from the MCU _ wake position, the display MCU201 is woken up, and then the power is supplied to the pin VIN of the Serializer (Serializer) and the pin VIN of the Deserializer (Deserializer), respectively, so that the chip starts to operate, and after the chip completes initialization, the chip starts to transmit the video signal, and at this time, the wake-up pulse signal is at a low level and does not function, and the video signal is not affected.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A display screen wake-up circuit, comprising:
the host computer end comprises a first filter circuit and a host computer MCU (microprogrammed control Unit), and the first filter circuit is respectively connected with a video signal line and the host computer MCU;
the display screen end comprises a second filter circuit and a display screen MCU, and the second filter circuit is respectively connected with the video signal line and the display screen MCU;
the first filter circuit is used for filtering a signal returned after the display screen MCU is awakened, the second filter circuit is used for filtering a high-frequency interference signal to prevent an awakening pulse signal from being triggered, and the host MCU is used for generating the awakening pulse signal and transmitting the awakening pulse signal to the display screen end through the first filter circuit and the video signal line in sequence to awaken the display screen MCU.
2. The display screen wake-up circuit according to claim 1, wherein the host terminal further comprises a first switch circuit, and the first switch circuit is configured to be connected to the host MCU and the first filter circuit, respectively.
3. The display screen wake-up circuit of claim 2, wherein the first switching circuit comprises: MOS tube Q1 and triode Q2;
the source electrode of the MOS tube Q1 is connected to a first voltage source, the grid electrode of the MOS tube Q1 is connected with the collector electrode of the triode, and the drain electrode of the MOS tube Q1 is connected with the first filter circuit;
and the base electrode of the triode Q2 is connected with the MCU of the host computer, and the emitting electrode is grounded.
4. The display screen wake-up circuit according to claim 1, wherein the first filter circuit and the second filter circuit are both RC filter circuits.
5. The display screen wake-up circuit according to claim 4, wherein the first filter circuit comprises: a resistor R13 and a capacitor C9;
one end of the resistor R13 is connected with the video signal line, and the other end of the resistor R13 is connected with the host MCU and is grounded through the capacitor C9.
6. The display screen wake-up circuit of claim 4, wherein the second filter circuit comprises a third filter circuit and a fourth filter circuit;
the third filter circuit is respectively connected with the video signal line and the fourth filter circuit, and the fourth filter circuit is connected with the display screen MCU.
7. The display screen wake-up circuit according to claim 6, wherein the third filter circuit comprises: a resistor R8 and a capacitor C7;
one end of the resistor R8 is connected with the video signal line, and the other end of the resistor R8 is connected with the fourth filter circuit and is grounded through the capacitor C7.
8. The display wake-up circuit according to claim 6, wherein the fourth filter circuit comprises: a resistor R9 and a capacitor C8;
one end of the resistor R9 is connected with the video signal line through the third filter circuit, and the other end of the resistor R9 is connected with the display screen MCU and is grounded through the capacitor C8.
9. The display screen wake-up circuit according to claim 1, wherein the display screen end further comprises a second switch circuit, and the second switch circuit is connected with the display screen MCU and connected with the video signal line through the second filter circuit.
10. The display wake-up circuit according to claim 9, wherein the second switching circuit comprises: MOS tube Q3 and MOS tube Q4;
the grid electrode of the MOS tube Q3 is connected with the video signal line through the second filter circuit, the drain electrode of the MOS tube Q3 is connected with the display screen MCU and connected to a second voltage source, and the source electrode of the MOS tube Q3 is grounded;
and the drain electrode of the MOS tube Q4 is connected with the display screen MCU and is connected with a second voltage source, the grid electrode is connected with the second voltage source, and the source electrode is grounded.
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| CN202211112761.7A CN115202602B (en) | 2022-09-14 | 2022-09-14 | Display screen wake-up circuit |
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| CN115202602B (en) | 2023-12-15 |
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