CN102568418A - Vehicle-mounted display system - Google Patents
Vehicle-mounted display system Download PDFInfo
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- CN102568418A CN102568418A CN2011104562131A CN201110456213A CN102568418A CN 102568418 A CN102568418 A CN 102568418A CN 2011104562131 A CN2011104562131 A CN 2011104562131A CN 201110456213 A CN201110456213 A CN 201110456213A CN 102568418 A CN102568418 A CN 102568418A
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- low voltage
- voltage differential
- differential signal
- lvds
- interface
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Abstract
The invention relates to a vehicle-mounted display system, comprising a host machine with a microprocessor, and a far-end display, wherein the far-end display is internally provided with a display screen, a touch screen, a backlight controller and a voltage stabilizer; the host machine is internally provided with a first LVDS (Low Voltage Differential Signaling) interface; the far-end display is internally provided with a second LVDS interface; the first LVDS interface is connected with the second LVDS interface through an LVDS cable; a video signal end of the display screen, the touch screen and a PWM (Pulse-Width Modulation) signal end of the backlight controller are respectively connected with the second LVDS interface; and a video signal end and a PWM signal end of the microprocessor are connected with the first LVDS interface.
Description
Technical field
The present invention relates to vehicle-mounted demonstration field, particularly relate to a kind of in-vehicle display system.
Background technology
Low Voltage Differential Signal (Low-Voltage Differential Signaling is called for short " LVDS ") is a kind of new technique that current high-performance data transmission is used that satisfies.Because it can make system's supply voltage be low to moderate 2V, so it can also satisfy the following needs of using.The LVDS technology has the Low Voltage Differential Signal and quick transit time of 330mV.This can let product reach from 100Mbps to the high data rate that surpasses 1Gbps.In addition, this low pressure amplitude of oscillation can reduce power consumption and dissipate, and possesses the advantage of differential transfer simultaneously.The LVDS technology is used for the interface communication chipset of simple line driver and receiver physical layer device and more complicated.The multiplexed TTL at a slow speed of the multiplexed reconciliation of channel link chipset signal line is to provide narrow formula high-speed low-power-consumption LVDS interface.These chipsets can significantly be saved the cable and the connector cost of system, and can reduce the required physical space of connector area occupied.The LVDS solution provides new selection for the designer solves the high-speed i/o interface problem.LVDS is that the current and following high band wide data transmission is used the scheme that the every kilomegabit of milliwatt is provided.
Present LCDs generally adopts the LVDS interface; In-vehicle display system is no exception; As shown in Figure 1; In the prior art, only have only between display screen and the main frame on the distal displayed device to link to each other through the LVDS interface, and the touch screen controller on the distal displayed device and backlight controller directly with main frame on microprocessor link to each other.Therefore connection cable is very complicated between distal displayed device and the main frame, makes the reliability that connects reduce.
Summary of the invention
Technical matters to be solved by this invention provides a kind of in-vehicle display system, reduces the connection cable between distal displayed device and the main frame, improves its reliability.
The technical solution adopted for the present invention to solve the technical problems is: a kind of in-vehicle display system is provided; Comprise the main frame and the distal displayed device that have microprocessor; Be provided with display screen, touch-screen control chip, backlight control control chip and voltage stabilizer in the said distal displayed device; Be provided with the first Low Voltage Differential Signal interface in the said main frame; Be provided with the second Low Voltage Differential Signal interface in the said distal displayed device, adopt the Low Voltage Differential Signal cable to connect between the said first Low Voltage Differential Signal interface and the second Low Voltage Differential Signal interface; The pulse width modulating signal end of the vision signal end of said display screen, touch-screen control chip and backlight control chip links to each other with the second Low Voltage Differential Signal interface respectively; The vision signal end of said microprocessor links to each other with the first Low Voltage Differential Signal interface with the pulse width modulating signal end.
Said touch-screen control chip links to each other with the second Low Voltage Differential Signal interface through the I2C bus.
Said Low Voltage Differential Signal cable adopts the PN cable.
Said PN cable links to each other with said voltage stabilizer through inductance, and said P line links to each other with battery through inductance, and the N line is through inductance ground connection.
Beneficial effect
Owing to adopted above-mentioned technical scheme; The present invention compared with prior art; Have following advantage and good effect: the display screen of distal displayed device, touch-screen control chip and backlight control chip all link to each other with the microprocessor of main frame through the LVDS interface among the present invention; Accomplish the power supply of distal displayed screen equipment, adjusting backlight and touch screen data passback simultaneously through LVDS, thereby reduce the connection cable of equipment room, improve reliability and reduce cost.Because LVDS communication robustness, the recovery after can realizing makeing mistakes is handled, owing to adopted the LVDS cable, the Linux of being convenient to transplant drives, and implementation is more flexible.
Description of drawings
Fig. 1 is the connection layout of main frame and distal displayed device in the prior art;
Fig. 2 is a connection layout of the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can do various changes or modification to the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment of the present invention relates to a kind of in-vehicle display system; As shown in Figure 2; Comprise the main frame and the distal displayed device that have microprocessor, be provided with display screen, touch-screen control chip, backlight control chip and voltage stabilizer in the said distal displayed device, be provided with a LVDS interface in the said main frame; Be provided with the 2nd LVDS interface in the said distal displayed device, adopt the LVDS cable to connect between a said LVDS interface and the 2nd LVDS interface; The pulse-length modulation of the vision signal end of said display screen, touch-screen control chip and backlight control chip (being called for short " PWM ") signal end links to each other with the 2nd LVDS interface respectively; The vision signal end of said microprocessor links to each other with a LVDS interface with the pwm signal end.Said LVDS cable adopts the PN cable, and said PN cable links to each other with said voltage stabilizer through inductance, and said P line links to each other with battery through inductance, and the N line is through inductance ground connection.
The present invention uses the LVDS interface to realize various functions, and the LVDS technology has Low Voltage Differential Signal (250mVMIN and 450mVMAX) and the quick transit time of 330mV.This can let product reach from 100Mbps to the high data rate that surpasses 1Gbps.In addition, this low pressure amplitude of oscillation can reduce power consumption and dissipate, and possesses the advantage of differential transfer simultaneously.The LVDS technology is used for the interface communication chipset of simple line driver and receiver physical layer device and more complicated.The multiplexed TTL at a slow speed of the multiplexed reconciliation of channel link chipset signal line is to provide narrow formula high-speed low-power-consumption LVDS interface.These chipsets can significantly be saved the cable and the connector cost of system, and can reduce the required physical space of connector area occupied.
Wherein, said touch-screen control chip links to each other with the 2nd LVDS interface through the I2C bus.I2C (Inter-Integrated Circuit) bus is by the twin wire universal serial bus of PHILIPS company exploitation, is used to connect microcontroller and peripherals thereof, is a kind of bus standard that extensively adopt in microelectronics Control on Communication field.It is a kind of special shape of synchronous communication, and it is few to have an interface line, and control mode is simple, and the device package form is little, and traffic rate is than advantages such as height.The I2C bus is only required two bus lines: a serial data line, another serial time clock line; Each device that is connected to bus can concern the software set address through unique address and the simple main frame/slave that exists always, and main frame can be used as main frame transmitter or main frame receiver; It is a host bus more than, if the initialization simultaneously of two or more main frames, data transmission can prevent that data are destroyed through collision detection and arbitration; 8 bidirectional data transfers bit rate of serial can reach 100kbit/s under mode standard, can reach 400kbit/s under the quick mode, can reach 3.4Mbit/s under the fast mode; The number of chips that is connected to same bus only receives the maximum capacitor 400pF restriction of bus.Because its each byte that sends on the serial data line is necessary for 8, the bytes in that each transmission can be sent is unrestricted.Must be after each byte with a response bit.At first transmission is the most significant digit (MSB) of data; If (for example in-line interrupt service routine) could receive or send next complete data byte after some other functions of confidential completion; Can make clock line keep low level; Force main frame to get into waiting status, data transmission continues after slave is ready to receive next data byte and discharges clock line.
Be not difficult to find, utilize the LVDS cable of transmission video signal, accomplish the power supply of distal displayed screen equipment, adjusting backlight and touch screen data passback simultaneously; Thereby reduce the connection cable of equipment room, improve reliability and reduce cost, because LVDS communication robustness; Recovery after can realizing makeing mistakes is handled; Owing to adopted the LVDS cable, the Linux of being convenient to transplant drives, and implementation is more flexible.
Claims (4)
1. in-vehicle display system; Comprise the main frame and the distal displayed device that have microprocessor; Be provided with display screen, touch-screen control chip, backlight control chip and voltage stabilizer in the said distal displayed device, be provided with the first Low Voltage Differential Signal interface in the said main frame, be provided with the second Low Voltage Differential Signal interface in the said distal displayed device; It is characterized in that, adopt the Low Voltage Differential Signal cable to connect between the said first Low Voltage Differential Signal interface and the second Low Voltage Differential Signal interface; The pulse width modulating signal end of the vision signal end of said display screen, touch-screen control chip and backlight control control chip links to each other with the second Low Voltage Differential Signal interface respectively; The vision signal end of said microprocessor links to each other with the first Low Voltage Differential Signal interface with the pulse width modulating signal end.
2. in-vehicle display system according to claim 1 is characterized in that, said touch-screen control chip links to each other with the second Low Voltage Differential Signal interface through the I2C bus.
3. in-vehicle display system according to claim 1 is characterized in that, said Low Voltage Differential Signal cable adopts the PN cable.
4. in-vehicle display system according to claim 3 is characterized in that, said PN cable links to each other with said voltage stabilizer through inductance, and said P line links to each other with battery through inductance, and the N line is through inductance ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104562131A CN102568418A (en) | 2011-12-30 | 2011-12-30 | Vehicle-mounted display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104562131A CN102568418A (en) | 2011-12-30 | 2011-12-30 | Vehicle-mounted display system |
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| CN102568418A true CN102568418A (en) | 2012-07-11 |
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| CN2011104562131A Pending CN102568418A (en) | 2011-12-30 | 2011-12-30 | Vehicle-mounted display system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280206A (en) * | 2013-04-27 | 2013-09-04 | 惠州市德赛西威汽车电子有限公司 | Method for monitoring vehicle-mounted LVDS (Low Voltage Differential Signaling) link |
| CN104268116A (en) * | 2014-09-24 | 2015-01-07 | 重庆长安汽车股份有限公司 | Communication mode for vehicle-mounted entertainment host and split type touch screen |
| CN105208246A (en) * | 2015-09-30 | 2015-12-30 | 重庆长安汽车股份有限公司 | Display screen parameter adaptive type display screen assembly and control method |
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2011
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| US5815735A (en) * | 1996-04-29 | 1998-09-29 | Compaq Computer Corporation | Portable computer with removable display screen using removably mateable connectors to form the sole supporting interconnection between the computer base portion and display screen structure |
| JPH10282933A (en) * | 1997-04-09 | 1998-10-23 | Hitachi Ltd | Liquid crystal display device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103280206A (en) * | 2013-04-27 | 2013-09-04 | 惠州市德赛西威汽车电子有限公司 | Method for monitoring vehicle-mounted LVDS (Low Voltage Differential Signaling) link |
| CN103280206B (en) * | 2013-04-27 | 2015-10-14 | 惠州市德赛西威汽车电子股份有限公司 | A kind of vehicle-mounted LVDS link monitoring method |
| CN104268116A (en) * | 2014-09-24 | 2015-01-07 | 重庆长安汽车股份有限公司 | Communication mode for vehicle-mounted entertainment host and split type touch screen |
| CN105208246A (en) * | 2015-09-30 | 2015-12-30 | 重庆长安汽车股份有限公司 | Display screen parameter adaptive type display screen assembly and control method |
| CN105208246B (en) * | 2015-09-30 | 2018-06-08 | 重庆长安汽车股份有限公司 | The display screen assembly and control method of display screen parameter adaptive |
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Application publication date: 20120711 |