CN211150068U - Display screen and driving circuit thereof - Google Patents
Display screen and driving circuit thereof Download PDFInfo
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- CN211150068U CN211150068U CN202020014299.7U CN202020014299U CN211150068U CN 211150068 U CN211150068 U CN 211150068U CN 202020014299 U CN202020014299 U CN 202020014299U CN 211150068 U CN211150068 U CN 211150068U
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Abstract
The utility model discloses a drive circuit and display screen of display screen. Wherein, the display screen includes a plurality of display module assemblies, and this drive circuit includes: the display module comprises a plurality of power supply channels and a plurality of display modules, wherein the plurality of power supply channels comprise a first power supply channel and a second power supply channel, the first power supply channel is used for providing working voltage for the display modules, the second power supply channel is used for providing preset voltage for at least one display module, the preset voltage is smaller than the working voltage, at least one end of the first power supply channel and at least one end of the second power supply channel are grounded, the display module comprises a plurality of lamp beads, and the lamp beads are in common anode connection or common cathode connection; the switch is arranged between one pole of at least one display module of the display screen and the plurality of power supply channels; and the controller is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel to supply power to the display module. The utility model provides an among the prior art display screen under the condition that does not use for a long time easy moist technical problem that leads to the display screen to break down.
Description
Technical Field
The utility model relates to a display field particularly, relates to a drive circuit and display screen of display screen.
Background
At present, a control circuit inside an L ED display driving constant-current chip is usually designed according to normal light emission of L ED, the minimum value of the constant current is milliampere IV which is more than or equal to 0.5 mA., but the application of the display screen is more and more extensive along with L ED, the unit pixel density of the L ED display screen is higher and higher, lamp beads in a L ED display module are smaller and smaller, the packaging material of the chip is more and more easily affected by damp due to a small-volume lamp tube, particularly, the L ED display screen is applied to each enterprise and public institution, the display screen is often turned off for a long time to cause the display module to be affected by damp and a light-emitting chip to be affected by damp, and further cause the whole display screen to be damaged.
Aiming at the problem that a L ED display module is easy to break down due to the fact that an L ED display screen is easy to be wet under the condition of not being used for a long time in the prior art, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a drive circuit and display screen of display screen to solve L ED display screen among the prior art at least and lead to L ED display module group to break down in the easy humidity under the condition that does not use for a long time technical problem.
According to the utility model discloses an aspect provides a drive circuit of display screen, and the display screen includes a plurality of display module assemblies, and drive circuit includes: the display module comprises a plurality of power supply channels and a plurality of display modules, wherein the plurality of power supply channels comprise a first power supply channel and a second power supply channel, the first power supply channel is used for providing working voltage for the display modules, the second power supply channel is used for providing preset voltage for at least one display module, the preset voltage is smaller than the working voltage, at least one end of the first power supply channel and at least one end of the second power supply channel are grounded, the display module comprises a plurality of lamp beads, and the lamp beads are in common anode connection or common cathode connection; the switch is arranged between one pole of at least one display module of the display screen and the plurality of power supply channels; and the controller is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel to supply power to the display module.
Further, the controller includes: the control register is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel; and the driving controller is used for controlling the power supply voltages of the plurality of power supply channels.
Further, the second power supply channel includes: and each power supply sub-channel corresponds to different preset voltage.
And further, the second power supply channel is a power supply channel, the driving controller is also connected with the control register, the control register outputs the currently required target preset voltage to the driving controller, and the driving controller supplies power to the display module through the second power supply channel according to the target preset voltage.
Furthermore, the driving circuit further comprises a timer, the timer is further used for recording the time length of the display screen in the closed state, and the control register is further used for controlling the switch to select the second power supply channel under the condition that the time length is greater than the preset time length.
Further, the control register is also used to determine whether the display screen is in an off state by detecting whether the main memory of the display screen is refreshed.
Further, under the condition that the lamp beads are connected in a common anode mode, the anodes of the lamp beads are connected with a power supply, and the cathodes of the lamp beads are connected with the first power supply channel or the second power supply channel through the switches.
Further, under the condition that the lamp beads are connected in a common cathode mode, the anodes of the lamp beads are connected into the first power supply channel or the second power supply channel through the switches and then connected into the power supply, and the cathodes of the lamp beads are grounded in a common mode.
Furthermore, the current provided by the second power supply channel for the display module is 0.1-0.4 uA.
Furthermore, the plurality of electron supply channels are three electron supply channels, and the currents provided by the three electron supply channels for the display module are respectively 0.1uA, 0.2uA and 0.3 uA.
Further, the preset voltage corresponding to the red chip of the display module is 1.8V, and the current corresponding to the preset voltage is 0.2 uA.
Furthermore, the preset voltage corresponding to the green chip of the display module is 1.3V, and the current corresponding to the preset voltage is 0.2 uA.
Furthermore, the preset voltage corresponding to the blue chip of the display module is 1.7V, and the current corresponding to the preset voltage is 0.4 uA.
According to an aspect of the embodiments of the present invention, there is provided a display screen, which includes the driving circuit of the display screen.
The embodiment of the utility model provides an in the display screen is in the closed condition, the display module assembly power supply for the display screen according to default voltage, wherein, default voltage is less than display module assembly's operating voltage, above-mentioned scheme is through supplying power for display module assembly according to the default voltage that is less than operating voltage for display module assembly under the condition that the display screen is closed, thereby can not light display module assembly and generate heat through weak electric current, and then reach damp-proof effect through generating heat of display module assembly, L ED display screen among the prior art has been solved and has been leaded to L ED display module assembly to break down in the easy humidity under the condition of not using for a long time.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
FIG. 1 is a schematic diagram of a driving circuit of a display panel according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an alternative driver circuit according to an embodiment of the present application; and
fig. 3 is a schematic diagram of an alternative driver circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such system, article, or apparatus.
Example 1
According to the embodiment of the present invention, an embodiment of a driving circuit of a display screen is provided, fig. 1 is a schematic diagram of a driving circuit of a display screen according to the embodiment of the present application, and as shown in fig. 1, the driving circuit includes:
the display module comprises a plurality of power supply channels, a plurality of light emitting diodes and a plurality of light receiving diodes, wherein the plurality of power supply channels comprise a first power supply channel 11 and a second power supply channel 12, the first power supply channel is used for providing working voltage for the display module, the second power supply channel is used for providing preset voltage for at least one display module, the preset voltage is smaller than the working voltage, at least one end of the first power supply channel and at least one end of the second power supply channel are grounded, the display module comprises a plurality of light beads, and the light beads are in common anode connection or common cathode connection;
the switch 13 is arranged between one pole of at least one display module of the display screen and the plurality of power supply channels;
and the controller 14 is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel to supply power to the display module.
The display screen comprises a plurality of display modules, each display module comprises a plurality of lamp beads, the two power supply channels are connected in the same mode, for L ED with a common anode, the power supply channels are arranged between the cathodes of the lamp beads of the display modules and the ground (the connection mode of the common anode is shown in figure 1), for the common cathode channels, the power supply channels are arranged between a power supply and the anodes of the lamp beads, and the cathodes of the lamp beads are grounded in common.
The working voltage of the display module is used for representing the voltage which can enable the lamp beads to be lightened and normally emit light, the preset voltage is smaller than the working voltage, the preset voltage is not enough to drive the lamp beads to be lightened, and the lamp beads do not emit light under the preset voltage.
After the preset voltage is provided for the display module, the current corresponding to the preset voltage can be generated, the lamp beads are difficult to point due to the fact that the preset voltage is smaller than the working voltage of the display module, and correspondingly, the current generated by the preset voltage is weak, and the current for starting the lamp beads is difficult to start.
It should be noted that the display module of this embodiment may be all the display modules of the display screen, or some of the display modules. The power supply for the display modules of the display screen according to the preset voltage can be unified power supply for all the display modules, can also be respectively power supply for different display modules, can also be power supply for only part of the display modules, and the preset voltage for supplying power for all the display modules can be the same or different; the display module of the display screen can be supplied with power according to the preset voltage, or can be supplied with power for a single display module respectively, and the preset voltage of each display module can be the same or different.
The preset voltage is smaller than the working voltage of the display module, so that when the display module is powered according to the preset voltage, the display module is not driven to emit light, but the preset voltage is converted into micro heat energy inside the display module, and the display module is enabled not to be damped. Because predetermine the voltage and can not light the lamp pearl, nevertheless can make the lamp pearl in the display module assembly give off the heat, when predetermineeing the voltage promptly, the lamp pearl is luminous not, only produces the heat, therefore can play dampproofing effect. And when playing dampproofing effect, because it is less to predetermine the voltage, be not enough to drive the lamp pearl luminous, consequently can not consume too high power.
It should be noted that the display screen may further include a battery, and when the display screen is powered off, the battery supplies power to the display screen. Because the power consumption of the display screen in the moisture-proof mode is smaller, the common battery can support the display screen to start the second power supply channel for moisture protection in a longer time.
Above-mentioned scheme is through setting up the switch to control the switch through the controller, thereby can switch between first power supply channel and second power supply channel, not only can satisfy the demand that the display screen normally worked, can also reach damp-proofing effect, solved L ED display screen among the prior art and wet the technical problem who leads to L ED display module to break down easily under the condition of not using for a long time.
As an alternative embodiment, the controller comprises: the control register is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel; and the driving controller is used for controlling the power supply voltages of the plurality of power supply channels.
According to the scheme, the switch is controlled through the control register, so that the switch can be switched between the first power supply channel and the second power supply channel, the power supply voltage of the plurality of power supply channels is controlled through the driving controller, different voltages are provided for the display module through the first power supply channel and the second power supply channel, the normal working requirement of the display screen can be met, and a damp-proof effect can be achieved.
As an alternative embodiment, the second power supply channel comprises: and each power supply sub-channel corresponds to different preset voltage.
Specifically, because the environmental humidity of different positions, different moments all probably is different, consequently required dampproofing dynamics is also different, and then makes the required target preset voltage of different moments also different. In the above scheme, the second power supply channel for providing the damp-proof preset voltage for the display module comprises a plurality of power supply channels, and each power supply channel corresponds to different preset voltages, so that different sub power supply channels can be selected according to the currently required target preset voltage.
In an alternative embodiment, fig. 2 is a schematic diagram of an alternative driving circuit according to an embodiment of the present application, and the scheme is described with reference to fig. 2 in this example by using a connection manner in which a lamp bead is a common anode. One end OUT1-OUTN of the switch in the driving circuit is used for indicating the cathode of the connected lamp beads (not shown in the figure), and the anodes of the lamp beads are connected with the power supply (not shown in the figure). The other end of the switch is used for being connected into different contacts through control, so that the lamp beads are connected into different power supply channels. The power supply channel comprises a working channel (namely the first power supply channel) and a micro current channel 1, a micro current channel 2 and a micro current channel 3 (namely the plurality of sub power supply channels, in the embodiment, three sub power supply channels are taken as an example for explanation), the switch is controlled by the control register, when the display screen normally works, the switch is connected to the working channel, the constant current selection driving controller provides working voltage corresponding to the lamp beads for the lamp beads in the display module, when the display screen enters a damp-proof mode, the control register determines target preset voltage according to the environmental humidity, and the control switch is connected to at least one of the three micro current channels according to the target preset voltage.
To be more specific, for example, the preset voltage corresponding to the micro current channel 1 is 0.1, the preset voltage corresponding to the micro current channel 2 is 0.4, and the preset voltage corresponding to the micro current channel 3 is 0.7. If the preset target voltage determined by the control register according to the current humidity is 0.4, the control register is connected to the micro-current channel 2 to provide corresponding voltage for the lamp beads.
As an optional embodiment, the second power supply channel is a power supply channel, and the driving controller is further connected to the control register, wherein the control register outputs a currently required target preset voltage to the driving controller, and the driving controller supplies power to the lamp bead through the second power supply channel according to the target preset voltage.
Specifically, because the environmental humidity of different positions, different moments all probably is different, consequently required dampproofing dynamics is also different, and then makes the required target preset voltage of different moments also different. In the above scheme, only one second power supply channel for providing damp-proof preset voltage for the lamp beads is provided, but the preset voltage output by the power supply channel can be continuously controlled through the control register.
In an alternative embodiment, fig. 3 is a schematic diagram of an alternative driving circuit according to an embodiment of the present application, and the example still uses a connection mode in which a lamp bead is a common anode to describe the above scheme with reference to fig. 3. One end OUT1-OUTN of the switch in the driving circuit is used for indicating the cathode of the connected lamp beads (not shown in the figure), and the anodes of the lamp beads are connected with the power supply (not shown in the figure). The other end of the switch is used for accessing different contacts, so that the lamp beads are accessed into different power supply channels. The power supply channel comprises a working channel (namely the first power supply channel) and a current-converting micro-current channel (namely the second power supply channel), the switch receives control of the control register, the switch is connected into the working channel when the display screen works normally, the constant-current selective drive controller provides working voltage corresponding to lamp beads for the lamp beads in the display module, the current-converting micro-current channel is connected into the current-converting micro-current channel when the display screen enters a damp-proof mode, the control register determines target preset voltage according to environment humidity and outputs the target preset voltage to the constant-current selective drive controller, and the constant-current selective drive controller outputs corresponding voltage to the lamp beads.
For example, if the preset target voltage determined by the control register according to the current humidity is 0.4, the control switch is connected to the variable current micro-current channel and outputs the determined target preset voltage to the constant current selection driving controller, and the constant current selection driving controller can supply power to the display module according to the target preset voltage.
As an optional embodiment, the control register further includes a timer, the timer is further configured to record a duration that the display screen is in the off state, and the control register is further configured to control the switch to select the second power supply channel when the duration is greater than a preset duration.
When the display screen is in the off state, the time length of the display screen is longer than the preset time length, and the time length of the display module not started is longer than the preset time length, so that the display module is easily affected by the environmental humidity, and the display module is affected by damp. Under this kind of condition, supply power for display module according to preset voltage to make the lamp pearl in the display module assembly can generate heat, and then play damp-proof effect.
As an alternative embodiment, the control register is further arranged to determine whether the display screen is in the off state by detecting whether the main memory of the display screen is refreshed.
When the display screen is in a closed state, no power consumption exists, the display screen is connected with a power supply but does not display pictures, the display screen is not bright, and because a RAM (Random Access Memory) is arranged on a control card of the display screen, the RAM is used for directly exchanging data with a control chip on the control card of the display screen to control the display screen to display images, the data in the RAM of the display screen is not refreshed when the display screen is in the closed state. In this embodiment, when the data in the RAM of the display screen is no longer refreshed, the check bit in the RAM is designated data, and when the check bit read by the control register into the RAM is designated data, it is determined that the data in the RAM of the display screen is no longer refreshed, and the display screen is in an off state. It can be understood that when the display screen is in the off state, the data in the RAM of the display screen is not refreshed any more, or the RAM of the display screen is detected to be in the power-off state.
In an alternative embodiment, the control register may determine whether the data in the RAM is refreshed by detecting a check bit in the RAM of the display screen to determine whether the display screen is turned on, and if the data in the RAM of the display screen is not refreshed, the control register determines that the display screen is in a turned-off state and is not turned on, and if the data in the RAM of the display screen is refreshed, the control register indicates that the display screen is turned on. The driving circuit can be provided with a timer, the timer starts timing after the display screen is closed, the display screen keeps timing when being in a closed state, and the timing is stopped when the display screen is opened so as to obtain the duration of the display screen when being in the closed state.
It should be noted that the power supply of the display screen can be switched, but the switching of the power supply does not affect the timing of the duration of the display screen being in the off state. For example, the display screen is connected to a 220V power grid when not powered off, and is connected to a backup battery in case of power off. The display screen is not powered off after being closed, the timer starts timing after the display screen is closed, at a certain moment after the display screen is closed, the worker powers off the display screen, the display screen is switched to be powered by the battery, however, as long as the display screen is not restarted, namely, the lamp beads of the display screen are not lightened again, the timer does not interrupt or count again, but continues timing.
As an optional embodiment, under the condition that the lamp beads are connected in a common anode mode, the anodes of the lamp beads are connected to the power supply, and the cathodes of the lamp beads are connected to the first power supply channel or the second power supply channel through the switches.
As an optional embodiment, under the condition that the lamp beads are connected in common with the cathode, the anode of the lamp beads is connected to the first power supply channel or the second power supply channel through the switch and then connected to the power supply, and the cathodes of the lamp beads are grounded in common.
As an optional embodiment, the current provided by the second power supply channel for the display module is 0.1-0.4 uA.
As an optional embodiment, the plurality of electron supply channels are three electron supply channels, and the currents provided by the three electron supply channels for the display module are 0.1uA, 0.2uA and 0.3uA respectively.
As an optional embodiment, the preset voltage corresponding to the red chip of the display module is 1.8V, and the current corresponding to the preset voltage is 0.2 uA.
As an optional embodiment, the preset voltage corresponding to the green chip of the display module is 1.3V, and the current corresponding to the preset voltage is 0.2 uA.
As an optional embodiment, the preset voltage corresponding to the blue chip of the display module is 1.7V, and the current corresponding to the preset voltage is 0.4 uA.
Example 2
According to the embodiment of the utility model provides a display screen is provided, this display screen includes the drive circuit of the display screen in embodiment 1. Through the drive circuit of this display screen, when the display screen is in the off-state, drive circuit can be according to the display module assembly power supply of default voltage for the display screen, and wherein, default voltage is less than the operating voltage of display module assembly.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
It should be noted that, in each embodiment, when the display screen is in the off state, the display screen is powered according to a preset voltage, where the preset voltage is smaller than the operating voltage of the display screen (bead), which may be embodied that when the display screen is in the off state, the display screen is not lit, but the temperature of the display screen may be detected to be higher than the temperature of the display screen after the display screen is normally cooled, for example, the external temperature, within a period of time.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (14)
1. The utility model provides a drive circuit of display screen which characterized in that, the display screen includes a plurality of display module assemblies, drive circuit includes:
the display module comprises a plurality of display modules, a plurality of power supply channels and a plurality of control modules, wherein the plurality of power supply channels comprise a first power supply channel and a second power supply channel, the first power supply channel is used for providing working voltage for the display modules, the second power supply channel is used for providing preset voltage for at least one display module, the preset voltage is smaller than the working voltage, at least one end of the first power supply channel and at least one end of the second power supply channel are grounded, the display module comprises a plurality of lamp beads, and the lamp beads are in common anode connection or common cathode connection;
the switch is arranged between one pole of at least one display module of the display screen and the plurality of power supply channels;
and the controller is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel to supply power to the display module.
2. The circuit of claim 1, wherein the controller comprises:
the control register is used for controlling the switch to be communicated with the first power supply channel or the second power supply channel;
a drive controller for controlling supply voltages of the plurality of supply channels.
3. The circuit of claim 1, wherein the second power channel comprises:
and each power supply sub-channel corresponds to different preset voltage.
4. The circuit of claim 2, wherein the second power supply channel is one power supply channel,
the driving controller is further connected with the control register, the control register outputs a currently required target preset voltage to the driving controller, and the driving controller supplies power to the display module through the second power supply channel according to the target preset voltage.
5. The circuit of claim 2, wherein the driving circuit further comprises a timer, the timer is further configured to record a duration of the display screen in the off state, and the control register is further configured to control the switch to select the second power channel if the duration is greater than a preset duration.
6. The circuit of claim 5, wherein the driver circuit is further configured to determine whether the display screen is in an off state by detecting whether a main memory of the display screen is refreshed.
7. The circuit of claim 1, wherein when the lamp beads are connected in common anode, the anodes of the lamp beads are connected in common to a power supply, and the cathodes of the lamp beads are connected to the first power supply channel or the second power supply channel through the switch.
8. The circuit of claim 1, wherein when the lamp beads are connected in a common cathode, the anode of the lamp beads is connected to the first power supply channel or the second power supply channel through the switch and then connected to a power supply, and the cathodes of the lamp beads are connected to a common ground.
9. The circuit according to claim 1, wherein the second power supply channel supplies a current of 0.1-0.4 uA to the display module.
10. The circuit of claim 3, wherein the plurality of electron supply channels are three electron supply channels, and the currents supplied by the three electron supply channels to the display module are 0.1uA, 0.2uA and 0.3uA, respectively.
11. The circuit according to claim 1, wherein the preset voltage corresponding to the red chip of the display module is 1.8V, and the current corresponding to the preset voltage is 0.2 uA.
12. The circuit according to claim 1, wherein the preset voltage corresponding to the green chip of the display module is 1.3V, and the current corresponding to the preset voltage is 0.2 uA.
13. The circuit according to claim 1, wherein the preset voltage corresponding to the blue chip of the display module is 1.7V, and the current corresponding to the preset voltage is 0.4 uA.
14. A display panel characterized in that it comprises a driving circuit of a display panel according to any one of claims 1 to 13.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020014299.7U CN211150068U (en) | 2020-01-02 | 2020-01-02 | Display screen and driving circuit thereof |
| PCT/CN2020/139923 WO2021136143A1 (en) | 2020-01-02 | 2020-12-28 | Display screen driving method and driving circuit, and display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020014299.7U CN211150068U (en) | 2020-01-02 | 2020-01-02 | Display screen and driving circuit thereof |
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| CN211150068U true CN211150068U (en) | 2020-07-31 |
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| CN202020014299.7U Active CN211150068U (en) | 2020-01-02 | 2020-01-02 | Display screen and driving circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021136143A1 (en) * | 2020-01-02 | 2021-07-08 | 广州视源电子科技股份有限公司 | Display screen driving method and driving circuit, and display screen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021136143A1 (en) * | 2020-01-02 | 2021-07-08 | 广州视源电子科技股份有限公司 | Display screen driving method and driving circuit, and display screen |
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