CN216212275U - Liquid crystal display driving circuit and liquid crystal display module - Google Patents
Liquid crystal display driving circuit and liquid crystal display module Download PDFInfo
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- CN216212275U CN216212275U CN202122762169.9U CN202122762169U CN216212275U CN 216212275 U CN216212275 U CN 216212275U CN 202122762169 U CN202122762169 U CN 202122762169U CN 216212275 U CN216212275 U CN 216212275U
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Abstract
The utility model discloses a liquid crystal display driving circuit and a liquid crystal display module, which comprise a driving board substrate PCB, wherein the driving board substrate PCB is provided with an HDMI-to-MIPI circuit, the HDMI-to-MIPI circuit comprises an HDMI connector and an HDMI-to-MIPI chip, and the HDMI-to-MIPI chip is connected with a liquid crystal display MIPI interface connector; wherein: the HDMI-to-MIPI chip adopts an LT6911UXC chip, an HDMI signal pin of the HDMI connector is connected to the input end of the LT6911UXC chip, and the output end of the LT6911UXC chip directly outputs MIPI signals. According to the utility model, only one chip is needed, so that the HDMI directly drives the MIPI screen after passing through the chip, and an additional MCU is not needed, thereby greatly saving the cost of the whole transfer circuit, and improving the reliability and signal integrity of the circuit.
Description
Technical Field
The utility model relates to the technical field of liquid crystal screen drive circuits, in particular to a liquid crystal screen drive circuit and a liquid crystal display module.
Background
MIPI (Mobile Industry Processor Interface) is an abbreviation of Mobile Industry Processor Interface, is a high-speed signal Interface, and is increasingly used in high-resolution liquid crystal screens. Meanwhile, the liquid crystal screen with the MIPI interface is widely applied to various products. In the prior art, the MIPI screen driven by the equipment with the HDMI is basically realized through two times of switching, namely, switching from HDMI to RGB, then switching from RGB to MIPI, or switching from HDMI to LVDS, then switching from LVDS to MIPI, and meanwhile, a single MCU is needed to configure the two switching chips, so that the cost is too high, more PCB area is occupied, and meanwhile, the integrity and reliability of signals are influenced after multiple times of switching.
For example, chinese patent publication is CN 208506421U's utility model, this utility model provides a HDMI changes MIPI mouth and takes TFT liquid crystal display module of USB electric capacity touch interface, including TFT liquid crystal screen and the PCB board of lower extreme thereof, the TFT liquid crystal screen pass through FPC and be connected with the PCB board, the TFT liquid crystal screen MIPI interface has, the PCB board on be equipped with liquid crystal drive. The PCB is also provided with an HDMI to MIPI circuit and an I2C to USB chip. HDMI changes MIPI circuit include master control MCU, HDMI interface connector, HDMI changes RGB chip, RGB changes MIPI chip, HDMI interface connector passes through the pin and changes RGB chip, RGB changes MIPI chip and be connected with the MIPI interface of TFT LCD screen through RGB changes MIPI chip connection in proper order, master control MCU changes the MIPI chip with RGB and is connected. Contain the HDMI in this patent and change RGB chip, RGB changes MIPI chip, needs solitary MCU to dispose these two kinds of switching chips, and the cost is too high to can occupy more PCB area, simultaneously, all influential to signal integrality and reliability after many times of switching.
Accordingly, a liquid crystal panel driving circuit is provided to solve the above problems of the related art.
SUMMERY OF THE UTILITY MODEL
The present invention provides a liquid crystal display driving circuit and a liquid crystal display module, so as to solve the problems in the prior art, reduce the circuit complexity, and ensure the integrity and reliability of signals.
In order to achieve the purpose, the utility model provides the following technical scheme:
according to a first aspect of the utility model, a liquid crystal screen driving circuit is provided, which comprises a driving board substrate PCB, wherein an HDMI-to-MIPI circuit is arranged on the driving board substrate PCB, the HDMI-to-MIPI circuit comprises an HDMI connector and an HDMI-to-MIPI chip, one end of the HDMI connector is connected with the HDMI-to-MIPI chip, and the other end of the HDMI-to-MIPI chip is connected with a liquid crystal screen MIPI interface connector; wherein: the HDMI-to-MIPI chip adopts an LT6911UXC chip, an HDMI signal pin of the HDMI connector is connected to the input end of the LT6911UXC chip, and the output end of the LT6911UXC chip directly outputs MIPI signals.
Optionally, the LT6911UXC chip embeds one MCU.
Optionally, the HDMI connector is a standard HDMI connector, a MINI-HDMI connector, or a Micro HDMI connector.
Optionally, a power circuit module is arranged on the driving board substrate PCB. Furthermore, the power circuit module is connected with the HDMI-to-MIPI chip and the liquid crystal screen MIPI interface connector, and provides power for the HDMI-to-MIPI chip and the liquid crystal screen MIPI interface connector.
According to a second aspect of the present invention, there is provided a liquid crystal display module, comprising: the liquid crystal display comprises a liquid crystal display and a liquid crystal display driving circuit used for driving the display, wherein the liquid crystal display driving circuit adopts the liquid crystal display driving circuit.
Compared with the prior art, the utility model has the beneficial effects that:
in the liquid crystal screen driving circuit, the HDMI to MIPI chip is adopted, so that the HDMI directly drives the MIPI screen after passing through the HDMI to MIPI chip, an additional MCU is not needed, the cost of the whole transfer circuit is greatly saved, and the reliability and the signal integrity of the circuit are improved.
Drawings
Fig. 1 is a structural diagram of a liquid crystal panel driving circuit according to an embodiment of the present invention.
Fig. 2 is a structural diagram of a liquid crystal panel driving circuit according to a preferred embodiment of the present invention.
Fig. 3 is a design diagram of an HDMI-to-MIPI chip in a liquid crystal display driving circuit according to an embodiment of the present invention.
Fig. 4 is a design diagram of an HDMI connector in a liquid crystal display driving circuit according to an embodiment of the present invention.
Fig. 5 is a design diagram of a liquid crystal screen MIPI interface in a liquid crystal screen driving circuit according to an embodiment of the present invention.
Fig. 6 is a design diagram of a power circuit module in a liquid crystal display driving circuit according to an embodiment of the utility model.
In the figure: 100. a drive board substrate PCB; 200. an HDMI connector; 300. HDMI to MIPI chip; 400. a liquid crystal screen MIPI interface connector; 500. and a power circuit module.
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the prior art, one chip is used to complete the conversion from HDMI to RGB (for example, IT66021FN in conjunction with yang), then one chip is used to complete the conversion from RGB to MIPI (for example, SSD2828 in solomon), and meanwhile, one MCU is needed to configure/coordinate the two chips, and the total worker needs 3 chips. In this embodiment, only one chip is needed to implement the switching operation from HDMI to MIPI.
As shown in fig. 1, to solve the above problem, in an embodiment of the present invention, a liquid crystal display driving circuit is provided, including a driving board substrate PCB board 100, the driving board substrate PCB board 100 is further provided with an HDMI to MIPI circuit, the HDMI to MIPI circuit includes an HDMI connector 200 and an HDMI to MIPI chip 300, the HDMI connector 200 is connected to the HDMI to MIPI chip 300, one side of the HDMI to MIPI chip 300 is connected to a liquid crystal display MIPI interface connector 400, wherein the HDMI to MIPI chip 300 adopts an LT6911UXC chip, an HDMI signal passing through the HDMI connector 200 is connected to the LT6911UXC chip, and a standard HDMI input signal directly outputs an MIPI signal after passing through the LT6911UXC chip.
This embodiment adopts an HDMI to change MIPI chip (LT6911UXC chip), replaces the problem of two switchovers among the prior art for the HDMI interface directly drives MIPI interface screen behind an HDMI changes MIPI chip, and does not need extra MCU, saves whole switching circuit cost greatly, promotes circuit reliability and signal integrality.
Fig. 2 is a schematic diagram of a liquid crystal panel driving circuit in a preferred embodiment of the present invention, in which the liquid crystal panel driving circuit of the HDMI-to-MIPI interface includes a driving board substrate PCB100 for carrying the whole driving circuit, and the driving board substrate PCB100 is provided with an HDMI-to-MIPI chip 300. The driving board substrate PCB100 is further provided with a power circuit module 500, and the power circuit module 500 provides power for the HDMI-to-MIPI chip 300 and the liquid crystal screen MIPI interface connector 400. Specifically, the HDMI to MIPI chip 300 converts HDMI signal processing from the HDMI connector 200 into an MIPI signal, and outputs the MIPI signal to the liquid crystal screen through the liquid crystal screen MIPI interface connector 400, the HDMI to MIPI chip 300 is used for protocol conversion and time sequence control of HDMI and MIPI, and meanwhile, the power supply circuit module 500 is connected with the HDMI to MIPI chip 300 and the liquid crystal screen MIPI interface connector 400, so as to provide power for the HDMI to MIPI chip 300 and provide power for the liquid crystal screen through the liquid crystal screen MIPI interface connector 400.
As shown in fig. 3, which is a design example of an HDMI to MIPI chip in an embodiment of the present invention, the HDMI to MIPI chip 300 employs an LT6911UXC chip, the LT6911UXC chip is packaged by QFN64, and the embedded MCU is used to configure the chip and MIPI initialization code, and supports HDMI2.0 input, 8LANEmipi output, and supports a maximum resolution of 2K × 2K. Specifically, referring to fig. 3, in the present embodiment, the standard HDMI input signal is connected to pins 2(HDMI clock signal TMDS _ CLK-), 3(HDMI clock signal TMDS _ CLK +), 5(HDMI data signal TMDS _ data0-), 6(HDMI data signal TMDS _ data0+), 8(HDMI data signal TMDS _ data1-), 9(HDMI data signal TMDS _ data1+), 11(HDMI data signal TMDS _ data2-), 12(HDMI data signal TMDS _ data2+), 15(DDC clock line), and 16(DDC data line) of the LT6911UXC chip.
After MIPI protocol conversion is performed inside the IC, MIPI signals are directly output via pins 35(MIPI data signal _ data0+), 36(MIPI data signal _ data0-), 37(MIPI data signal _ data1+), 38(MIP data signal I _ data1-), 39(MIPI clock signal _ clk +), 40(MIPI clock signal _ clk-), 41(MIPI data signal _ data2+), 42(MIPI data signal _ data2-), 43(MIPI data signal _ data3+), 44(MIPI data signal _ data3-), and the like of LT6911 UXC. The software parts involved in this chip can all adopt the prior art.
As shown in fig. 4, which is a diagram illustrating a design embodiment of an HDMI connector according to an embodiment of the present invention, further, the HDMI connector may be a standard HDMI, MINI-HDMI or Micro HDMI. Wherein the HDMI signal pins 1(HDMI clock signal TMDS _ CLK-), 3(HDMI clock signal TMDS _ CLK +), 4(HDMI data signal TMDS _ data0-), 6(HDMI data signal TMDS _ data0+), 7(HDM I data signal TMDS _ data1-), 9(HDMI data signal TMDS _ data1+), 10(HDMI data signal TMDS _ data2-), 12(HDMI data signal TMDS _ data2+), 15(DDC clock line), 16 (HDMI DDC data line) are respectively connected to pins 2(HDMI clock signal TMDS _ CLK-), 3(HDMI clock signal TMDS _ CLK +), 5(HDMI data signal S _ 0-), 6(HDMI data signal S _ data 4 +), 8(HDMI data signal TMDS _ 1-), 9(HDMI data signal TMDS _ 1+), 11 (TMDS _ data signal TMDS _ 48312-), TMDS _ data (TMDS _ data _ 3525-), 3(HDMI data _ data-) of the switching chip LT 1UXC chip LT 1 of FIG. 1, 15(DDC clock line), 16(DDC data line).
As shown in fig. 5, which is a diagram of a design embodiment of a liquid crystal screen MIPI interface in an embodiment of the present invention, further, in this embodiment, a 4lane MIPI signal is used, and a 30PIN-0.5MM ZIF connector is used as a connector.
As shown in fig. 6, which is a diagram of a design embodiment of a power circuit module according to an embodiment of the present invention, the power circuit module includes two DC/DC circuits, an output terminal of one of the DC/DC circuits is a 3.3V output terminal, an output terminal of the other DC/DC circuit is a 1.2V output terminal, both the output terminals are connected to an LT6911UXC chip, and meanwhile, the 3.3V output terminal is further connected to a liquid crystal panel connector. Further, two DC/DC circuits generate 3.3V and 1.2V to supply LT6911UXC chips as in FIG. 1, wherein 3.3V is also supplied to the liquid crystal panel for use through the liquid crystal panel connector as in FIG. 4.
In another embodiment, based on the liquid crystal panel driving circuit in the above embodiments, there is provided a liquid crystal display module, including: the liquid crystal display panel comprises a liquid crystal display panel and a liquid crystal display panel driving circuit, wherein the liquid crystal display panel driving circuit adopts the liquid crystal display panel driving circuit in any embodiment. The HDMI to MIPI chip 300 of the lcd panel driving circuit processes and converts the HDMI signal from the HDMI connector 200 into an MIPI signal, and outputs the MIPI signal to the lcd panel through the lcd panel MIPI interface connector 400.
In a preferred embodiment, the liquid crystal panel is a TFT liquid crystal panel, and the TFT liquid crystal panel is connected to the driving board substrate PCB100 of the liquid crystal panel driving circuit. The TFT liquid crystal screen is provided with an MIPI interface, and the MIPI interface is connected with a liquid crystal screen MIPI interface connector 400 of the liquid crystal screen driving circuit, so that a liquid crystal display module is formed. Of course, in other embodiments, the liquid crystal display further includes a necessary power module to provide a corresponding power for the liquid crystal display.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (10)
1. A liquid crystal screen driving circuit comprises a driving board substrate PCB, wherein an HDMI-to-MIPI circuit is arranged on the driving board substrate PCB, and the liquid crystal screen driving circuit is characterized in that the HDMI-to-MIPI circuit comprises an HDMI connector and an HDMI-to-MIPI chip, one end of the HDMI connector is connected with the HDMI-to-MIPI chip, and the other end of the HDMI-to-MIPI chip is connected with a liquid crystal screen MIPI interface connector; wherein: the HDMI-to-MIPI chip adopts an LT6911UXC chip, an HDMI signal pin of the HDMI connector is connected to the input end of the LT6911UXC chip, and the output end of the LT6911UXC chip directly outputs MIPI signals.
2. The liquid crystal screen driving circuit according to claim 1, wherein an MCU is embedded in the LT6911UXC chip.
3. The LCD panel driving circuit of claim 1, wherein the HDMI connector is a standard HDMI connector, a MINI-HDMI connector or a Micro HDMI connector.
4. The liquid crystal display driving circuit according to claim 1, wherein the liquid crystal display MIPI interface connector is a 30PIN-0.5MM ZIF connector.
5. The liquid crystal display driving circuit according to claim 1, wherein a power circuit module is disposed on the driving board substrate PCB.
6. The LCD panel driving circuit of claim 5, wherein the power circuit module is connected to the HDMI-to-MIPI chip and the LCD panel MIPI interface connector to provide power to the HDMI-to-MIPI chip and the LCD panel MIPI interface connector.
7. The LCD panel driving circuit as claimed in claim 6, wherein the power circuit module comprises two DC/DC circuits, one of the DC/DC circuits has a 3.3V output, the other DC/DC circuit has a 1.2V output, both outputs are connected to the LT6911UXC chip, and the 3.3V output is also connected to the LCD panel connector.
8. A liquid crystal display module includes: the liquid crystal display and the liquid crystal display driving circuit for driving the liquid crystal display are characterized in that the liquid crystal display driving circuit adopts the liquid crystal display driving circuit of any one of claims 1 to 7.
9. The liquid crystal display module of claim 8, wherein the liquid crystal panel is a TFT liquid crystal panel.
10. The liquid crystal display module of claim 9, wherein the TFT liquid crystal panel has an MIPI interface.
Priority Applications (1)
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CN202122762169.9U CN216212275U (en) | 2021-11-12 | 2021-11-12 | Liquid crystal display driving circuit and liquid crystal display module |
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CN202122762169.9U CN216212275U (en) | 2021-11-12 | 2021-11-12 | Liquid crystal display driving circuit and liquid crystal display module |
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CN216212275U true CN216212275U (en) | 2022-04-05 |
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