CN214752884U - Circuit board and display screen - Google Patents
Circuit board and display screen Download PDFInfo
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- CN214752884U CN214752884U CN202120411773.4U CN202120411773U CN214752884U CN 214752884 U CN214752884 U CN 214752884U CN 202120411773 U CN202120411773 U CN 202120411773U CN 214752884 U CN214752884 U CN 214752884U
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Abstract
The embodiment of the utility model discloses a circuit board and a display screen, wherein the circuit board comprises a printed circuit substrate, and a power circuit module, a constant current control module and a logic circuit module are integrated on the printed circuit substrate; the logic circuit module and the display main board are in transmission connection through a connecting wire; the power circuit module comprises a voltage input end, a first voltage output end and a second voltage output end; the alternating voltage passes through the voltage input end, and the first power level voltage value output by the first voltage output end supplies power to the constant current control module and the logic circuit module respectively; the second power level voltage value output by the second voltage output end supplies power to the power circuit of the constant current control module, so that the external backlight module is driven by the power circuit to perform backlight display. The scheme simplifies the connection of each board card assembly; the assembly cost of the whole machine assembly and the processing difficulty of electromagnetic interference are reduced, and the constant current control efficiency of the whole machine is improved.
Description
Technical Field
The embodiment of the utility model provides a relate to the electron field, especially relate to a circuit board and display screen.
Background
At present, the interior of a liquid crystal display screen is often formed by a plurality of independent board card assemblies, for example, the included board card assemblies mainly comprise a display main board, a power supply board, a logic board, a constant current control board, a display panel, a backlight module, a shell rack and the like. The board card assemblies are connected through connecting lines, and specifically, fig. 1 provides a connection structure diagram of an existing display screen assembly.
The current board card assembly in the liquid crystal display screen is formed and connected in a mode that the following problems exist:
1. when the included independent board card assemblies are connected, connecting wires of all the parts are complex, and the board card assemblies may come from different manufacturers, so that the assembly cost of the whole machine (the liquid crystal display screen) is high, and the manufacture is complex;
2. in the existing structural design, the distance between the logic board and the display main board is far, the connecting wire required by the connection between the logic board and the display main board is long, and the electromagnetic interference of the whole system is difficult to process when the connecting wire is long due to high frequency of communication signals.
3. The independent constant current boards used at present are all provided with special conversion circuits for voltage grade conversion, and when the power supply boards supply power to the independent constant current boards, the power supply boards must pass through the conversion circuits first, so that the whole process has one more stage of power conversion, and the power conversion efficiency of the whole system is low.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a circuit board and display screen to solve the problem that each subassembly exists under the current component form among the liquid crystal display.
In a first aspect, an embodiment of the present invention provides a circuit board, including a printed circuit substrate, on which a power circuit module, a constant current control module and a logic circuit module are integrated;
the logic circuit module and the display main board are in transmission connection through a connecting wire;
the power circuit module includes: a voltage input terminal, a first voltage output terminal and a second voltage output terminal;
after the alternating-current voltage passes through the voltage input end, a first power level voltage value is output through the first voltage output end to respectively supply power to the constant-current control module and the logic circuit module; and outputting a second power level voltage value through the second voltage output end to supply power to a power circuit of the constant current control module, so that the constant current control module drives an external backlight module to perform backlight display through the power circuit.
Optionally, the display main board is connected with the circuit board as an external board card assembly; or, as a display main board circuit module, the display main board circuit module is integrated on the printed circuit substrate and is arranged adjacent to the logic circuit module.
Optionally, the power supply circuit module supplies power to the display main board through a first voltage output end, and switches a power supply state to a state corresponding to a power switch signal when receiving the power switch signal determined by the display main board according to a display requirement, where the power supply state includes: a start-up state and a standby state.
Optionally, the constant current control module includes: a Flexible Flat Cable (FFC) socket,
the FFC plug socket is arranged at the edge of the substrate of the printed circuit substrate and used for plugging a backlight and establishing connection with the backlight module.
Optionally, the power circuit module includes: a flyback transformer, an LLC transformer, a Low Voltage Differential Signaling (LVDS) socket, and a dc output socket;
when the circuit board is externally connected with the display mainboard, the display mainboard is externally connected through an LVDS socket, and the power is supplied to the display mainboard through the first voltage output end through the direct current output socket.
Optionally, the power circuit module is arranged in the middle area of the printed circuit substrate;
the constant current control module comprises a first constant current control circuit and a second constant current control circuit which are respectively arranged at two sides of the power supply circuit;
the logic circuit module is arranged on the upper side of the power circuit module.
In a second aspect, an embodiment of the present invention provides a display screen, including: backlight module and display panel still include the circuit board that above-mentioned first aspect provided.
Optionally, the backlight module is connected with a constant current control module in the circuit board, and backlight brightness/darkness is adjusted under the control of the constant current control module; the constant current control module controls the backlight module through a backlight control signal fed back by the display main board.
Optionally, the display panel is connected to the logic circuit module in the circuit board, and presents a display picture corresponding to the picture display signal when receiving the picture display signal transmitted by the logic circuit module; the logic circuit module is converted into a picture display signal through a display control signal fed back by the display main board.
Optionally, the display main board is integrated on the circuit board, or is connected to the circuit board as a board card assembly of the display screen.
The embodiment of the utility model provides a pair of circuit board and display screen, it is mainly integrated like logic board, power supply board and constant current control panel to original independent design's integrated circuit board subassembly to formed the circuit board that contains logic circuit module, power circuit module and constant current control module, and specifically integrated on the printed circuit base plate that constitutes the circuit board, realized the trinity integration of integrated circuit board subassembly. Compared with the existing connection mode between the independent board card assemblies, the circuit modules or the control modules integrated on the printed circuit board can be directly welded through the wiring on the board, so that the wiring of the board card assemblies is simplified; the assembly cost of the whole machine assembly is reduced, and the rapid transmission of electric signals among different electric modules is ensured; meanwhile, the circuit board formed by integrating the three-in-one board card assembly enhances the signal shielding effect, and the display screen comprising the circuit board greatly reduces the processing difficulty of electromagnetic interference in work; in addition, trinity need not additionally to set up the converting circuit of voltage level conversion among the constant current control module on carrying out the integrated circuit board subassembly basis and forming the circuit board, and the power circuit who contains can directly receive the direct current voltage of power supply circuit module second voltage output, has avoided converting circuit's loss, is favorable to the promotion of constant current control efficiency.
Drawings
FIG. 1 provides a prior art connection structure of a display panel assembly;
fig. 2 is a schematic structural diagram of a circuit board according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of another circuit board according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a display screen according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 2 is a schematic structural diagram of a circuit board according to a first embodiment of the present invention, as shown in fig. 2, the circuit board 1 includes a printed circuit board 10, and a power circuit module 11, a constant current control module 12 and a logic circuit module are integrated on the printed circuit board 10;
the logic circuit module and the display main board 20 are in transmission connection through a connecting wire;
the power supply circuit module 11 includes: a voltage input terminal 110, a first voltage output terminal 111 and a second voltage output terminal 112;
after the alternating voltage passes through the voltage input end 110, a first power level voltage value is output through a first voltage output end 111 to respectively supply power to the constant current control module 12 and the logic circuit module; the second power level voltage value is output through the second voltage output terminal 112 to supply power to the power circuit of the constant current control module 12, so that the constant current control module 12 drives the external backlight module through the power circuit to perform backlight display.
In the present embodiment, the circuit board 1 is equivalent to integrate the original independent logic board, power supply board and constant current control board on the same printed circuit board 10 in a modular form, so as to simplify the connection mode of the independent board card assembly and integrate the same structure. Specifically, the circuit board 1 provided in this embodiment is mainly used as a component in a display screen in practical application, and in the schematic structural diagram shown in fig. 2, when the display main board 20 is used as an external component, it needs to be connected to a logic circuit module on the printed circuit substrate 10 through a connecting wire, and in order to effectively reduce the difficulty of processing electromagnetic interference, the connecting wire and a shielding ground wire on the printed circuit substrate 10 can be preferably routed in parallel.
In this embodiment, compared to the original independent power supply board, the power circuit module 11 integrated on the printed circuit board 10 has a voltage input terminal 110, and the ac voltage provided by the ac power supply system can be accessed through the voltage input terminal 110; meanwhile, the setting of the two voltage output ends is also carried out, namely the power circuit module 11 can directly output the direct-current voltages of two different power levels. The dc voltage of the corresponding power stage output by one of the voltage output terminals can supply power to other circuit modules, control modules or driving modules on the printed circuit substrate 10, such as a logic circuit module and a constant current control module 12; the power circuit in the constant current control module 12 can be supplied with the dc voltage of the corresponding power stage output through the other voltage output terminal.
In this embodiment, compared to the original independent constant current control board, the constant current control module 12 integrated on the printed circuit board 10 does not need to add a dc voltage level conversion circuit-DCDC circuit, and the included power circuit can be directly connected to the second voltage output terminal 112 on the power circuit module 11. When the constant current control module 12 is externally connected with a backlight module, the power circuit can directly receive the dc voltage of the corresponding power level outputted from the voltage output terminal to drive the backlight module to perform backlight display. The structure setting avoids the loss of a DCDC circuit and ensures the improvement of constant current control efficiency.
In the circuit board provided by the embodiment, in the existing connection mode between the independent board card assemblies, the circuit modules or the control modules integrated on the printed circuit board can be directly welded through the routing on the substrate, so that the connection of the board card assemblies is simplified; the assembly cost of the whole machine assembly is reduced, and the rapid transmission of electric signals among different electric modules is ensured; meanwhile, the circuit board formed by integrating the three-in-one board card assembly enhances the signal shielding effect, and the display screen comprising the circuit board greatly reduces the processing difficulty of electromagnetic interference in work; in addition, trinity need not additionally to set up the converting circuit of voltage level conversion among the constant current control module on carrying out the integrated circuit board subassembly basis and forming the circuit board, and the power circuit who contains can directly receive the direct current voltage of power supply circuit module second voltage output, has avoided converting circuit's loss, is favorable to the promotion of constant current control efficiency.
Further, the display main board 20 is connected with the circuit board 1 as an external board card assembly; alternatively, the display main board circuit module is integrated on the printed circuit board 10 and arranged adjacent to the logic circuit module.
For example, the display main board 20 connected to the logic circuit module may be an independent board card assembly, and is connected to the circuit board 1 through a corresponding socket interface on the circuit board 1, and this connection manner effectively shortens the connection distance between the display main board 20 and the logic circuit module, and reduces the difficulty in processing electromagnetic interference generated during operation of a display screen including the circuit board 1.
Similarly, the display main board 20 may also be a display main board circuit module directly integrated on the printed circuit board 10 of the circuit board 1, at this time, the display main board circuit module and the logic circuit module are disposed adjacently on the printed circuit board 10, and preferably, the display main board circuit module is disposed above the logic circuit module. The layout manner is shown in fig. 3, wherein fig. 3 is a schematic structural diagram of a circuit board 1 according to an embodiment of the present invention. It can be seen that the display main board circuit module is disposed above the logic circuit module, and the connection form between the display main board circuit module and the logic circuit module can also achieve the effect of reducing the difficulty in processing the electromagnetic interference generated during the operation of the display screen including the circuit board 1.
Further, the power circuit module 11 supplies power to the display main board 20 through the first voltage output end 111, and when receiving a power switch signal determined by the display main board 20 according to a display requirement, switches the power supply state to a state corresponding to the power switch signal, where the power supply state includes: a start-up state and a standby state.
In this embodiment, the power circuit module 11 can also supply power to the display main board 20, and specifically, can output the power to the display main board 20 through the first voltage output end 111. In addition, there is signal interaction between the power circuit module 11 and the display main board 20, specifically, the display main board 20 may provide a power switch signal to the power circuit module 11, and the power circuit module 11 performs power supply state conversion according to the power switch signal, for example, when the power switch signal points to power off, the power circuit module 11 will be in a power off state. The power switch signal formed by the display main board 20 mainly depends on the display requirement of the display screen corresponding to the power switch signal.
Further, the constant current control module 12 includes: the FFC is inserted into the socket 120,
the FFC socket 120 is disposed on the edge of the printed circuit board 10 for plugging the backlight to connect with the backlight module.
Further, the power circuit module 11 includes: a flyback transformer 114, an LLC transformer 113, an LVDS socket 115, and a dc output socket 116;
when the circuit board 1 is externally connected to the display motherboard 20, the display motherboard 20 is externally connected to the LVDS socket 115, and the display motherboard 20 is powered by the dc output socket 116 through the first voltage output end 111.
It can be understood that the FFC sockets 120 in the constant current control module 12 are disposed on the edge of the printed circuit board 10, so as to conveniently plug the backlight module, and thus the backlight module is connected to the constant current control module 12. The flyback transformer 114 and the LLC transformer 113 included in the power circuit module 11 each play a role in converting an ac voltage into a dc voltage.
In addition, on the basis of the above embodiment, when the display main board 20 is connected to the circuit board 1 in the form shown in fig. 2, the connection is mainly realized through the LVDS socket 115 and the dc output socket 116 in the power circuit module 11, the signal transmission connection between the display main board 20 and the circuit board 1 can be realized through the LVDS socket 115, and the effective power supply from the circuit board 1 to the display main board 20 can be realized through the dc output socket 116. In addition, as can be seen from fig. 2, in the present embodiment, the flyback transformer 114 is disposed below the LLC transformer 113, so as to shorten the arrangement distance between each transformer and the LVDS socket 115 and the dc output socket 116, and the arrangement manner is used to replace the connection based on external wires, thereby achieving the shielding effect of reducing various interference signals.
Further, the power circuit module 11 is disposed in the middle area of the printed circuit board 10;
the constant current control module 12 includes a first constant current control circuit 121 and a second constant current control circuit 122, which are respectively disposed on two sides of the power circuit;
the logic circuit module is arranged on the upper side of the power circuit module 11.
It should be noted that the features further described in this embodiment correspond to another preferred layout form of the modules on the circuit board 1, and an exemplary illustration of this part is given by the structural diagram shown in fig. 3. It can be seen that this layout further subdivides the constant current control module 12 into two parts, namely, the first constant current control circuit 121 and the second constant current control circuit 122, while the power circuit module 11 is disposed in the middle area of the printed circuit substrate 10, and the logic circuit module is disposed in the power circuit module 11.
In addition, it can be seen that the printed circuit board 10 in fig. 3 further integrates a display main board 20 as a display main board circuit module, the display main board 20 is disposed above the logic circuit module, so as to scale the disposition distance between the logic circuit module and the display main board 20, and meanwhile, in this disposition form, the LLC transformer 113 may be disposed above the flyback transformer 114, which is also used to shorten the disposition distance and reduce noise signal interference when the logic circuit module and the display main board 20 perform signal transmission.
Example two
Fig. 4 is a schematic structural diagram of a display screen according to an embodiment of the present invention, as shown in fig. 4, the display screen includes: backlight unit 30, display panel 40, and the utility model provides a circuit board 1, backlight unit 30 is connected with the constant current control module 12 in the circuit board 1, and display panel 40 is connected with the logic circuit module 13 in the circuit board 1.
In this embodiment, the display screen includes the circuit board 1 provided in the first embodiment in addition to the display panel 40 and the backlight module 30 required for display, and meanwhile, the backlight module 30 may be directly connected to the constant current control module 12 through a corresponding socket (e.g., an FFC socket 120) on the circuit board 1, so as to implement backlight display in the display process; the display panel 40 may also be connected to the logic circuit module 13 according to a corresponding socket on the circuit board 1, so as to display the image of the content to be displayed during the display process.
In this embodiment, a display main board 20 required for further optimizing the display screen may be integrated on the circuit board 1, or a board assembly as the display screen may be connected to the circuit board 1.
In practical applications, a plurality of display panels may be connected by electrical wires to form a spliced display panel including a plurality of display panels provided in the present embodiment. The formed spliced screen can be used for meetings, teaching, advertisement putting and the like, or can be used for forming other display products.
Two display screens that provide of this embodiment have contained the utility model discloses above-mentioned embodiment improves the circuit board that forms after the back to original structure, and the trinity integration of integrated circuit board subassembly has been realized to the circuit board that improves. Compared with the existing connection mode between the independent board card assemblies, the circuit modules or the control modules integrated on the printed circuit board can be directly welded through the wiring on the board, so that the wiring of the board card assemblies is simplified; the assembling cost of the display screen during assembling is reduced, and the rapid transmission of electric signals among different electric modules is ensured. Meanwhile, the circuit board formed by integrating the three-in-one board card assembly enhances the signal shielding effect, so that the processing difficulty of electromagnetic interference is greatly reduced during the working of the display screen containing the circuit board; in addition, trinity need not additionally to set up the converting circuit of voltage level conversion among the constant current control module on carrying out the integrated circuit board subassembly basis and forming the circuit board, and the power circuit who contains can directly receive the direct current voltage of power supply circuit module second voltage output, has avoided converting circuit's loss, is favorable to the promotion of constant current control efficiency.
Further, the backlight module 30 adjusts the backlight brightness/darkness under the control of the constant current control module 12; the constant current control module 12 controls the backlight module 30 according to the backlight control signal fed back by the display main board 20.
It can be known that, when the circuit board 1 provided in the first embodiment is adopted in the display panel, the constant current control module 12 associated with the backlight module 30 in the circuit board 1 is not additionally provided with a DCDC conversion circuit, and the backlight brightness can be adjusted by the power circuit module 11 based on the voltage output by the second voltage output terminal 112. It should be noted that there is also a signal line connected between the logic circuit module 12 and the constant current control module 13, and the display main board 20 can feed back the backlight control signal to each backlight partition of the backlight module 30 through the logic circuit module 13, so as to implement the brightness adjustment of the backlight module 30. The layout form effectively avoids the loss of the conversion circuit and is beneficial to the improvement of the constant current control efficiency in the display system.
Further, the display panel 40 presents a display image corresponding to the image display signal when receiving the image display signal transmitted by the logic circuit module 13; the logic circuit module 13 converts the display control signal fed back by the display main board 20 into a picture display signal.
It can be known that, the image display signal of the logic circuit module 13 is output by the display main board 20, and the circuit board 1 provided in the first embodiment of the present invention is adopted in the display screen, so that the processing difficulty of the noise signal (such as an electromagnetic signal) can be reduced by shortening the layout distance or adjusting the wiring form of the connecting wires, thereby ensuring that the transmitted image display signal is more real, and thus improving the display effect of the whole display system.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A circuit board comprises a printed circuit substrate, and is characterized in that a power circuit module, a constant current control module and a logic circuit module are integrated on the printed circuit substrate;
the logic circuit module and the display main board are in transmission connection through a connecting wire;
the power circuit module includes: a voltage input terminal, a first voltage output terminal and a second voltage output terminal;
after the alternating-current voltage passes through the voltage input end, a first power level voltage value is output through the first voltage output end to respectively supply power to the constant-current control module and the logic circuit module; and outputting a second power level voltage value through the second voltage output end to supply power to a power circuit of the constant current control module, so that the constant current control module drives an external backlight module to perform backlight display through the power circuit.
2. The circuit board of claim 1, wherein the display motherboard is connected to the circuit board as an external board card assembly; or, as a display main board circuit module, the display main board circuit module is integrated on the printed circuit substrate and is arranged adjacent to the logic circuit module.
3. The circuit board of claim 1, wherein the power circuit module supplies power to the display motherboard through a first voltage output terminal, and switches a power supply state to a state corresponding to a power switch signal determined by the display motherboard according to a display requirement when receiving the power switch signal, where the power supply state includes: a start-up state and a standby state.
4. The circuit board of claim 1, wherein the constant current control module comprises: a flexible flat cable FFC socket is provided,
the FFC plug socket is arranged at the edge of the substrate of the printed circuit substrate and used for plugging a backlight and establishing connection with the backlight module.
5. The circuit board of claim 1, wherein the power circuit module comprises: the device comprises a flyback transformer, an LLC transformer, a low-voltage differential signal LVDS socket and a direct-current output socket;
when the circuit board is externally connected with the display mainboard, the display mainboard is externally connected through an LVDS socket, and the power is supplied to the display mainboard through the first voltage output end through the direct current output socket.
6. The circuit board of claim 1, wherein the power circuit module is disposed in a middle region of the printed circuit substrate;
the constant current control module comprises a first constant current control circuit and a second constant current control circuit which are respectively arranged at two sides of the power supply circuit;
the logic circuit module is arranged on the upper side of the power circuit module.
7. A display screen, comprising: backlight unit and display panel, its characterized in that still includes: the circuit board of any one of claims 1 to 6,
the backlight module is connected with the constant current control module in the circuit board, and the display panel is connected with the logic circuit module in the circuit board.
8. The display screen of claim 7, wherein the backlight module is controlled by the constant current control module to adjust backlight brightness/darkness;
the constant current control module controls the backlight module through a backlight control signal fed back by the display main board.
9. The display screen of claim 7, wherein the display panel, upon receiving the frame display signal transmitted by the logic circuit module, presents a display frame corresponding to the frame display signal;
the logic circuit module is converted into a picture display signal through a display control signal fed back by the display main board.
10. The display screen according to claim 8 or 9, wherein the display main board is integrated on the circuit board, or is connected with the circuit board as a board assembly of the display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120411773.4U CN214752884U (en) | 2021-02-24 | 2021-02-24 | Circuit board and display screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120411773.4U CN214752884U (en) | 2021-02-24 | 2021-02-24 | Circuit board and display screen |
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| CN214752884U true CN214752884U (en) | 2021-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114664242A (en) * | 2022-04-14 | 2022-06-24 | 深圳创维－Rgb电子有限公司 | Backlight constant-current control circuit and television |
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2021
- 2021-02-24 CN CN202120411773.4U patent/CN214752884U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114664242A (en) * | 2022-04-14 | 2022-06-24 | 深圳创维－Rgb电子有限公司 | Backlight constant-current control circuit and television |
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