Mainboard of all-in-one machine

Abstract

The utility model relates to a mainboard of an all-in-one machine. The all-in-one machine mainboard comprises an LVDS signal generator, an LVDS connector, a first power supply circuit, a second power supply circuit and a power supply selection circuit which are arranged on the mainboard, the LVDS signal generator is electrically connected with a signal pin of the LVDS connector and provides an LVDS signal for the LVDS interface display screen connected to the LVDS connector through a cable; the first power supply circuit and the second power supply circuit are electrically connected with the input end of the power supply selection circuit respectively so as to provide a first voltage power supply and a second voltage power supply for the power supply selection circuit; the output end of the power supply selection circuit is electrically connected with a power supply pin of the LVDS connector, and provides a first voltage power supply or a second voltage power supply for an LVDS interface display screen which is connected with the LVDS connector through a cable. The all-in-one machine mainboard can provide various power supplies for the LVDS interface display screen, can support the adaptation of various LVDS interface display screens, and avoids the risks of revision or non-support and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic computers, in particular to an all-in-one computer mainboard. Background Art

[0002] LVDS (Low-Voltage Differential Signaling) is a differential signal technology with low power consumption, low bit error rate, low crosstalk and low radiation. The core of LVDS technology is to transmit data at high speed with an extremely low voltage swing, which can achieve point-to-point or one-to-many connections. Its transmission medium can be a copper PCB connection or a balanced cable.

[0003] Among the digital signals output by the liquid crystal display driver board, in addition to including RGB data signals, it also includes signals such as line synchronization, field synchronization, and pixel clock. Among them, the highest frequency of the pixel clock signal can exceed 28 MHz. When using a TTL interface, the data transmission rate is not high, the transmission distance is short, and the anti-electromagnetic interference (EMI) ability is also relatively poor, which will have a certain impact on RGB data; in addition, the TTL multi-channel data signals are transmitted in the form of a cable. The total number of cables reaches dozens of channels, which is not only inconvenient to connect, but also not suitable for the trend of ultra-thinness. Using an LVDS output interface to transmit data can solve these problems and achieve high-speed, low-noise, long-distance, and high-accuracy transmission of data.

[0004] An all-in-one computer (English: All-in-One PC, abbreviated as "AIO") is a desktop computer that integrates a microprocessor, a mainboard, a hard disk, a screen, speakers, a video lens, a display, etc. into one. In the usage scenario of an all-in-one computer, a display screen using an LVDS interface is often used. However, when display screen manufacturers make display screens using an LVDS interface, some manufacturers make the internal power supply of low-power display screens 3.3V, and some make it 5V.

[0005] This adds difficulties to the design and production of an all-in-one computer mainboard that adapts to an LVDS interface display screen, because generally only one power supply is reserved for the LVDS interface display screen when designing the all-in-one computer mainboard, but customers who purchase the all-in-one computer mainboard sometimes frequently replace the display screen that adapts to different LVDS interfaces. This leads to risks such as motherboard design revisions or non-support. Summary of the Invention

[0006] Therefore, the purpose of the utility model is to provide an all-in-one computer mainboard that provides multiple power supplies to an LVDS interface display screen.

[0007] To achieve the above object, the utility model provides an all-in-one main board, including: an LVDS signal generator, an LVDS connector, a first power circuit, a second power circuit, and a power selection circuit provided on the main board; the LVDS signal generator is electrically connected to the signal pins of the LVDS connector to provide an LVDS signal to an LVDS interface display screen connected to the LVDS connector through a cable; the first power circuit and the second power circuit are respectively electrically connected to the input end of the power selection circuit to provide a first voltage power supply and a second voltage power supply to the power selection circuit; the output end of the power selection circuit is electrically connected to the power pins of the LVDS connector to provide a first voltage power supply or a second voltage power supply to an LVDS interface display screen connected to the LVDS connector through a cable.

[0008] Wherein, the power selection circuit is a single-pole double-throw switch.

[0009] Wherein, the power selection circuit is a three-pin jumper structure and a matching jumper cap.

[0010] Wherein, it further includes a third power circuit, the third power circuit is electrically connected to the input end of the power selection circuit to provide a third voltage power supply to the power selection circuit; the output end of the power selection circuit is electrically connected to the power pins of the LVDS connector to provide a first voltage power supply, a second voltage power supply or a third voltage power supply to an LVDS interface display screen connected to the LVDS connector through a cable.

[0011] Wherein, the power selection circuit is a multiplexer.

[0012] Wherein, the LVDS signal generator is a chip LT7911D.

[0013] Wherein, the LVDS signal generator is electrically connected to the signal pins of the LVDS connector via a common-mode inductor.

[0014] Wherein, the first voltage power supply is 3.3V.

[0015] Wherein, the second voltage power supply is 5V.

[0016] Wherein, the second power circuit includes an NMOS transistor and a PMOS transistor; the gate of the NMOS transistor is electrically connected to a switch signal, the drain of the NMOS transistor is electrically connected to the 5V standby power supply on the main board, and the source of the NMOS transistor is electrically connected to the ground; the gate of the PMOS transistor is electrically connected to the drain of the NMOS transistor, the drain of the PMOS transistor is used as the output end of the second voltage power supply, and the source of the PMOS transistor is electrically connected to the 5V power supply on the main board.

[0017] In summary, the all-in-one motherboard of the present utility model can provide multiple power supplies to the LVDS interface display screen, support the adaptation of multiple LVDS interface display screens, and avoid risks such as board modification or non-support. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solutions and other beneficial effects of the present utility model will become obvious through the detailed description of the specific embodiments of the present utility model in conjunction with the accompanying drawings. In the drawings,

[0019] Figure 1 is the circuit block diagram of a preferred embodiment of the all-in-one motherboard of the present utility model;

[0020] Figure 2 is the schematic diagram of the LVDS interface of a preferred embodiment of the all-in-one motherboard of the present utility model;

[0021] Figure 3 is the schematic diagram of the jumper structure and jumper cap of a preferred embodiment of the all-in-one motherboard of the present utility model;

[0022] Figure 4A and Figure 4B is the schematic diagram of the peripheral circuit of the LVDS interface of a preferred embodiment of the all-in-one motherboard of the present utility model;

[0023] Figure 5 is the schematic diagram of the power supply circuit of a preferred embodiment of the all-in-one motherboard of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Referring to Figure 1 , which is the circuit block diagram of a preferred embodiment of the all-in-one motherboard of the present utility model. The all-in-one motherboard of the present utility model includes: an LVDS signal generator, an LVDS connector, a first power supply circuit, a second power supply circuit, and a power supply selection circuit provided on the motherboard. Other general configurations on the motherboard such as the CPU and memory are not described in detail here.

[0025] Referring to Figure 2 , which is the schematic diagram of the LVDS interface of a preferred embodiment of the all-in-one motherboard of the present utility model. The LVDS interface on the motherboard is used to connect to the LVDS interface display screen. The LVDS interface has various signal pins (PINs) for transmitting data signals to the display screen, and a power supply pin for transmitting the power supply EDP_PWR to the display screen, mainly used to supply power to the internal circuit of the display screen.

[0026] The LVDS signal generator, such as the chip LT7911D, is used to convert the video-related signals of the all-in-one host into LVDS signals. The LVDS signal generator is electrically connected to the signal pins of the LVDS connector, thereby providing LVDS signals to the LVDS interface display screen connected to the LVDS connector through a cable.

[0027] In this preferred embodiment, two optional power supplies are added to the main board of the present utility model, which are controlled by switches or jumpers. By adding jumpers or single-pole double-throw switches, the voltage level at the LVDS display interface can be selected between 3.3V and 5V.

[0028] The first power supply circuit and the second power supply circuit are respectively electrically connected to the input end of the power supply selection circuit to provide the first voltage power supply and the second voltage power supply to the power supply selection circuit; the output end of the power supply selection circuit is electrically connected to the power supply pin of the LVDS connector to provide the first voltage power supply or the second voltage power supply to the LVDS interface display connected to the LVDS connector through a cable, specifically, it can be 3.3V and 5V commonly used for LCD displays. For the two voltage selection requirements, the power supply selection circuit can specifically be a single-pole double-throw switch.

[0029] See Figure 3 , which is a schematic diagram of the jumper structure and jumper cap of a preferred embodiment of the main board of the all-in-one machine of the present utility model. In this preferred embodiment, the power supply selection circuit is a three-pin jumper structure and a matching jumper cap, which can provide the first voltage power supply of 3.3V and the second voltage power supply of 5V to the LCD display.

[0030] The first voltage power supply P3V3 provided by the first power supply circuit on the main board is connected to pin 3 of the jumper structure, and the second voltage power supply +5V_LVDS0 provided by the second power supply circuit on the main board is connected to pin 1 of the jumper structure. Through the cooperation of the jumper cap, it is selected to connect either pin 2 and pin 3 or pin 1 of the jumper structure, so as to output the power supply EDP_PWR outward through pin 2, and finally output it to the display through the LVDS interface.

[0031] In this preferred embodiment, only dual power supply selection is made. In fact, triple power supply or multiple power supply selection can be made. The number of pins (PINs) of the jumper cap structure can be increased or a multi-way switch can be replaced. For example, if it is desired to provide a third voltage selection for the LVDS interface display, the main board of the all-in-one machine of the present utility model can further include a third power supply circuit. The third power supply circuit is electrically connected to the input end of the power supply selection circuit to provide a third voltage power supply to the power supply selection circuit; the output end of the power supply selection circuit is electrically connected to the power supply pin of the LVDS connector to provide the first voltage power supply, the second voltage power supply or the third voltage power supply to the LVDS interface display connected to the LVDS connector through a cable. A selection is made among the first voltage power supply, the second voltage power supply or the third voltage power supply through a matching multi-way switch.

[0032] See Figure 4A and Figure 4B, which is a schematic diagram of the peripheral circuit of the LVDS interface in a preferred embodiment of the main board of the all-in-one machine of the present utility model. In this preferred embodiment, the LVDS signal generator is electrically connected to the signal pins of the LVDS connector via a common-mode inductor. The signal provided by the LVDS signal generator is subjected to noise reduction processing by the common-mode inductor and then provided to the LVDS interface, and finally supplied to the display screen.

[0033] See Figure 5 , which is a schematic diagram of the power supply circuit in a preferred embodiment of the main board of the all-in-one machine of the present utility model. The various power supplies provided by the main board of the all-in-one machine of the present utility model to the display screen of the LVDS interface can be configured to be sourced from the power supply circuit on the main board. For example, as Figure 5 shown, in this preferred embodiment, the second power supply circuit that provides the second voltage power supply +5V_LVDS0 includes an NMOS transistor and a PMOS transistor; the gate of the NMOS transistor is electrically connected to the switch signal LVDS_ENPVCC / I2C_ADDR, the drain of the NMOS transistor is electrically connected to the 5V standby power supply P5VSB on the main board, and the source of the NMOS transistor is electrically connected to the ground; the gate of the PMOS transistor is electrically connected to the drain of the NMOS transistor, the drain of the PMOS transistor serves as the output terminal of the second voltage power supply to output +5V_LVDS0, and the source of the PMOS transistor is electrically connected to the 5V power supply P5V on the main board. Among them, the NMOS serves as a switching transistor to generate an enabling signal LCDVDD_EN1 and input it to the PMOS gate to control the generation of the +5V_LVDS0 power supply.

[0034] In summary, the main board of the all-in-one machine of the present utility model can provide multiple power supplies to the display screen of the LVDS interface, can support the adaptation of multiple LVDS interface display screens, and avoid risks such as board modification or non-support.

[0035] As described above, for those of ordinary skill in the art, various corresponding changes and deformations can be made according to the technical solutions and technical concepts of the present utility model, and all such changes and deformations should fall within the protection scope of the appended claims of the present utility model.

Claims

1. An all-in-one motherboard, characterized in that: include: An LVDS signal generator, an LVDS connector, a first power supply circuit, a second power supply circuit, and a power supply selection circuit are arranged on the mainboard; The LVDS signal generator is electrically connected to the signal pin of the LVDS connector to provide an LVDS signal to the LVDS interface display screen connected to the LVDS connector via a cable; the first power supply circuit and the second power supply circuit are electrically connected to the input end of the power selection circuit respectively to provide the first voltage power supply and the second voltage power supply to the power selection circuit; the output end of the power selection circuit is electrically connected to the power pin of the LVDS connector to provide the first voltage power supply or the second voltage power supply to the LVDS interface display screen connected to the LVDS connector via a cable.

2. The integrated mainboard according to claim 1, characterized in that: The power selection circuit is a single-pole double-throw switch.

3. The integrated mainboard according to claim 1, characterized in that: The power selection circuit is a three-pin jumper structure and a matching jumper cap.

4. The integrated mainboard according to claim 1, wherein: It also includes a third power supply circuit, which is electrically connected to the input end of the power selection circuit to provide a third voltage power supply to the power selection circuit; the output end of the power selection circuit is electrically connected to the power pin of the LVDS connector to provide the first voltage power supply, the second voltage power supply or the third voltage power supply to the LVDS interface display connected to the LVDS connector via a cable.

5. The integrated mainboard according to claim 4, characterized in that: The power selection circuit is a multi-way switch.

6. The integrated mainboard according to claim 1, wherein: The LVDS signal generator is a chip LT7911D.

7. The integrated computer motherboard according to claim 1, characterized in that: The LVDS signal generator is electrically connected to the signal pin of the LVDS connector via a common mode inductor.

8. The integrated mainboard according to claim 1, characterized in that: The first voltage power supply is 3.3V.

9. The integrated computer motherboard according to claim 1, wherein: The second voltage power supply is 5V.

10. The integrated computer motherboard according to claim 1, wherein: The second power supply circuit includes an NMOS tube and a PMOS tube; the gate of the NMOS tube is electrically connected to a switching signal, the drain of the NMOS tube is electrically connected to a 5V standby power supply on the mainboard, and the source of the NMOS tube is electrically connected to the ground; the gate of the PMOS tube is electrically connected to the drain of the NMOS tube, the drain of the PMOS tube serves as the output end of the second voltage power supply, and the source of the PMOS tube is electrically connected to the 5V power supply on the mainboard.

Images