CN115148149A - LED (light-emitting diode) row tube and LED display screen - Google Patents

LED (light-emitting diode) row tube and LED display screen Download PDF

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Publication number
CN115148149A
CN115148149A CN202210952411.5A CN202210952411A CN115148149A CN 115148149 A CN115148149 A CN 115148149A CN 202210952411 A CN202210952411 A CN 202210952411A CN 115148149 A CN115148149 A CN 115148149A
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China
Prior art keywords
unit
output
tube
led
channel
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CN202210952411.5A
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Chinese (zh)
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张汉儒
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Chipone Technology Beijing Co Ltd
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Chipone Technology Beijing Co Ltd
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Priority to CN202210952411.5A priority Critical patent/CN115148149A/en
Publication of CN115148149A publication Critical patent/CN115148149A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides an LED (light emitting diode) row tube and an LED display screen, which relate to the technical field of display screens, and the LED row tube comprises: the device comprises a capacitor unit, a buffer unit and at least one travelling pipe channel; the row tube channel comprises an output current MOS tube, a switch unit and a control module; when the output current MOS tube is closed, the switch unit is opened, and the output end of the buffer unit and the first end of the capacitor unit are connected with the output end of the travelling tube channel through the opened switch unit and are used for setting the shadow eliminating potential of the travelling tube channel. According to the LED row tube, the capacitor unit is added, so that at least one channel can be set to eliminate the shadow potential by using the capacitor, the problems of complex circuit design and high power consumption are solved, the cost is reduced, and the effect of improving the image quality by the LED coupling phenomenon is improved.

Description

LED (light-emitting diode) row tube and LED display screen
Technical Field
The invention relates to the technical field of display screens, in particular to an LED (light emitting diode) row tube and an LED display screen.
Background
The smear phenomenon is a technical problem which is difficult to solve in the industry, is closely related to the LED display screen smear elimination technology, and can affect the quality of a displayed picture if the LED display screen current smear elimination effect is poor. In general LED tubulation in the existing market, all set up the vanishing module alone at every passageway generally, the realization of tubulation vanishing voltage draws a period of time to close through the tubulation basically, draws and draws vanishing potential float, perhaps operational amplifier (buffer) to vanishing potential to thereby reach the vanishing voltage and solve the smear problem. The shadow eliminating module is independently arranged in each channel in the scheme, and the problems of complex circuit design, high power consumption and high cost exist.
Disclosure of Invention
The invention aims to provide an LED (light emitting diode) row tube and an LED display screen, which are used for relieving the technical problems of complex circuit design and high cost in the prior art.
In a first aspect, an embodiment of the present application provides an LED tube, including: the device comprises a capacitor unit, a buffer unit and at least one row pipe channel;
the travelling tube channel comprises an output current MOS tube, a switch unit and a control module; when the output current MOS tube is closed, the switch unit is opened, and the output end of the buffer unit and the first end of the capacitor unit are connected with the output end of the row tube channel through the opened switch unit and are used for setting the shadow elimination potential of the row tube channel.
In one embodiment, the first end of the control module is an input end of the tubulation channel; the second end of the control module is connected with the first end of the output current MOS tube and is used for controlling the on and off of the output current MOS tube; the third end of the control module is connected with the first end of the switch unit and is used for controlling the switch unit to be switched on and off; and the second end of the switch unit and the second end of the output current MOS tube are both connected with the output end of the travelling tube channel.
In one embodiment, when the output current MOS transistor is turned on, the switching unit is turned off, the output current MOS transistor is turned on, and the output of the column channel is the output of the output current MOS transistor.
In one embodiment, the buffer unit includes an operational amplifier, the positive pole of the operational amplifier is the VUPDN input terminal, the negative pole of the operational amplifier is connected to the output terminal of the operational amplifier, and the output of the operational amplifier is the output of the buffer unit.
In one embodiment, the output current MOS transistor is an N-type field effect transistor; the buffer unit further comprises a first output unit; the negative electrode of the operational amplifier is a VUPnPn input end, the positive electrode of the operational amplifier is connected with the first end of the first output unit, and the first end of the first output unit is used as the output end of the buffer unit.
In one embodiment, the output current MOS transistor is a P-type field effect transistor; the buffer unit further comprises a second output unit; the negative electrode of the operational amplifier is a VUPnPn input end, the positive electrode of the operational amplifier is connected with the first end of the second output unit, the first end of the second output unit is used as the output end of the buffer unit, and the second end of the second output unit is grounded.
In one embodiment, the second terminal of the capacitor unit is grounded, or the second terminal of the capacitor unit is connected to a power supply.
In a second aspect, an embodiment of the present application provides an LED display screen, which includes an LED lamp panel and a row tube in any one of the above-mentioned first aspects.
The invention provides an LED (light emitting diode) row tube and an LED display screen, wherein the LED row tube comprises: the device comprises a capacitor unit, a buffer unit and at least one row pipe channel; the row tube channel comprises an output current MOS tube, a switch unit and a control module; when the output current MOS tube is closed, the switch unit is opened, the output end of the buffer unit and the first end of the capacitor unit are connected with the output end of the travelling tube channel through the opened switch unit, and the switch unit is used for setting the shadow eliminating potential of the travelling tube channel. This LED tubulation can make at least one passageway utilize this electric capacity to carry out the setting of vanishing electric potential through increasing the electric capacity unit, has alleviated the problem that circuit design is complicated, the consumption is great, has realized simplifying the circuit, the effect of cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a conventional LED row tube structure;
fig. 2 is a schematic structural diagram of an LED row tube according to an embodiment of the present invention;
fig. 3 is a circuit connection diagram of an LED row tube according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a first buffer unit according to an embodiment of the present invention;
fig. 5 is a schematic circuit structure diagram of a second buffer unit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a third buffer unit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an LED display panel with a common anode applied according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an LED display panel with a common cathode according to an embodiment of the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
In the general LED drive tube in the market at present, a shadow eliminating module is generally arranged on each channel independently, as shown in fig. 1, shadow eliminating voltage of the drive tube is basically realized by closing the drive tube, pulling the drive tube for a period of time to close, pulling the drive tube to a shadow eliminating potential to float, or buffering (buffer) the drive tube to the shadow eliminating potential so as to achieve the shadow eliminating voltage and solve the problem of smear. That is to say, the above scheme is realized by independently arranging the shadow eliminating module in each channel, and the problems of complex circuit design, high power consumption and high cost exist.
Based on this, the embodiment of the invention provides an LED (light emitting diode) row tube and an LED display screen, so as to solve the technical problems of complex design, high power consumption and high cost of an LED row tube circuit in the prior art.
To facilitate understanding of the present embodiment, first, a detailed description is given of an LED tube disclosed in the present embodiment, referring to a schematic structural diagram of an LED tube shown in fig. 2, where the LED tube mainly includes: a capacitor unit 110, a buffer unit 120 and at least one row pipe channel.
The row tube channel comprises a switch unit 131, a control module 132 and an output current MOS tube 133; when the output current MOS 133 is turned off, the switch unit 131 is turned on, and both the output end of the buffer unit 120 and the first end of the capacitor unit 110 are connected to the output end of the row tube channel through the turned-on switch unit 131, so as to set the shadow eliminating potential of the row tube channel.
In one embodiment, the first end of the control module is an input end of the travelling pipe channel; the second end of the control module is connected with the first end of the output current MOS tube and is used for controlling the on and off of the output current MOS tube; the third end of the control module is connected with the first end of the switch unit and is used for controlling the switch unit to be switched on and off; and the second end of the switch unit and the second end of the output current MOS tube are both connected with the output end of the travelling tube channel.
In this embodiment, the number of the row tube channels may be one, that is, each channel uses one capacitor unit and one buffer unit; the number of the row tube channels can also be 2 to N, and at the moment, the N row tube channels can also share one capacitor unit and one buffer unit.
Referring to a specific example shown in fig. 3, the LED row tube includes N +1 row tube channels, and the input ends of the row tube channels are respectively: IN0, IN1, 8230, 8230INN; the output ends of the tube-moving channels are respectively: OUT0, OUT1, 8230A, OUTN (N is an integer of at least 0); each LED row tube channel comprises a switch unit, a control module and an output current MOS tube, and in addition, the LED row tube further comprises a buffer unit and a capacitor unit.
The first end of the control module is the input end of the row pipe channel (corresponding to IN 0-INN IN FIG. 3); the second end of the control module is connected with the first end of the output current MOS tube and used for controlling the on and off of the output current MOS tube; the third end of the control module is connected with the first end of the switch unit and is used for controlling the switch unit to be switched on and off; the second end of the switch unit and the second end of the output current MOS tube are both connected with the output ends (corresponding to OUT 0-OUTN in FIG. 3) of the row tube channels; the third terminal of the switch unit is connected with the output terminal of the buffer unit (i.e. the first terminal of the capacitor unit).
As a specific example, the switching unit may be a field effect transistor (NMOS, PMOS) or a transmission gate. The type of the output current MOS tube can be NMOS or PMOS.
In this embodiment, other structures except the capacitor unit may be disposed on a chip, and the capacitor unit is connected to a corresponding PIN of the chip; in another embodiment, the capacitor unit may be packaged inside the chip.
That is, the output ends of the N +1 tubulation channels can be coupled to an LED array, and the LED array can be a common-anode type LED array or a common-female type LED array.
In this embodiment, when the output current MOS transistor of a certain channel is turned off, the switch unit in the channel is turned on, and at this time, the output of the row of transistor channels is the shadow elimination voltage.
When the output current MOS tube of the channel is conducted and the switch unit in the channel is closed, the output end of the row tube channel outputs the output end voltage of the output current MOS tube.
Namely: when the output current MOS tube is closed, the switch unit is opened, the buffer unit and the capacitor unit are connected with the output end of the travelling tube channel through the opening switch unit and the like, and are used for providing a vanishing voltage for the output ends of the channel and the like, so that a vanishing function is provided for the LED array connected with the output end.
In an embodiment, referring to the schematic circuit structure of the first buffer unit shown in fig. 4, the buffer unit includes an operational amplifier, the positive electrode of the operational amplifier is a VUPDN input terminal, the negative electrode of the operational amplifier is connected to an output terminal of the operational amplifier, and an output of the operational amplifier is an output of the buffer unit. The buffer unit can be applied to the condition that the output current MOS tube is an N-type field effect tube or a P-type field effect tube.
In another embodiment, when the output current MOS transistor is an N-type field effect transistor, referring to the schematic circuit structure of the second buffer unit 50 shown in fig. 5, the buffer unit may further include a first output unit 510; the negative electrode of the operational amplifier is a VUPnPn input end, the positive electrode of the operational amplifier is connected with the first end of the first output unit, and the first end of the first output unit is used as the output end of the buffer unit. In another embodiment, when the output current MOS transistor is a P-type field effect transistor, referring to the schematic circuit structure of the third buffer unit 60 shown in fig. 6, the buffer unit may further include a second output unit 610; the negative electrode of the operational amplifier is a VUPnPN input end, the positive electrode of the operational amplifier is connected with the first end of the second output unit, the first end of the second output unit is used as the output end of the buffer unit, and the second end of the second output unit is grounded.
As a specific example, the first output unit may be a PMOS transistor, the second output unit may be an NMOS transistor, and the two output units are connected to an operational amplifier in the manner shown in fig. 5 and 6, respectively, to form a second buffer unit 50 and a third buffer unit 60. It should be noted that, in a specific example, different buffer units (buffers) are required to be set according to different types of output MOS, which is specifically represented as: when the output current MOS transistor is an NMOS, the first buffer unit or the second buffer unit (fig. 4 or fig. 5) may be used; when the output current MOS transistor is a PMOS, the first buffer unit or the third buffer unit (fig. 4 or fig. 6) may be used. And the power consumption of the second buffer unit and the third buffer unit is less than that of the first buffer unit.
In one embodiment, the second terminal of the capacitor unit is grounded, or the second terminal of the capacitor unit is connected to a power supply. It should be noted that, the second end of the capacitor unit may also be connected to a voltage regulator with strong driving force.
The invention provides an LED (light emitting diode) row tube, which comprises: the device comprises a capacitor unit, a buffer unit and at least one row pipe channel; the row tube channel comprises an output current MOS tube, a switch unit and a control module; when the output current MOS tube is closed, the switch unit is opened, and the output end of the buffer unit and the first end of the capacitor unit are connected with the output end of the travelling tube channel through the opened switch unit and are used for setting the shadow eliminating potential of the travelling tube channel. This LED tubulation can make at least one passageway utilize this electric capacity to carry out the setting of vanishing electric potential through increasing the electric capacity unit, has alleviated the problem that circuit design is complicated, the consumption is great, has realized simplifying the circuit, the effect of cost is reduced. The scheme simplifies the circuit design, reduces the power consumption, can effectively improve the high-low gray coupling of the LED, and further improves the picture quality.
In addition, this application embodiment still provides an LED display screen, including the LED lamp plate and the LED capable pipe that provides in any one above-mentioned embodiment. As a specific example, referring to fig. 7, in the common anode application, each of the plurality of column dies may use a capacitor (each of the plurality of column dies includes a plurality of column channels), or a capacitor PIN of each of the plurality of column dies may be connected to a capacitor. Referring to fig. 8, in a common cathode application, one capacitor may be used per can chip (each can chip includes multiple can channels), or a capacitor PIN of a plurality of the row tube chips can be connected with a capacitor together.
The invention provides an LED (light emitting diode) row tube, which comprises: the device comprises a capacitor unit, a buffer unit and at least one row pipe channel; the row tube channel comprises an output current MOS tube, a switch unit and a control module; when the output current MOS tube is closed, the switch unit is opened, the output end of the buffer unit and the first end of the capacitor unit are connected with the output end of the travelling tube channel through the opened switch unit, and the switch unit is used for setting the shadow eliminating potential of the travelling tube channel. According to the LED travelling tube, the capacitor unit is added, so that at least one channel can be set to eliminate the shadow potential by using the capacitor, the circuit design is simplified, the occupied area is saved, the power consumption is reduced, the high-low gray coupling of the LED can be effectively improved, and the picture quality is improved.
The above description is intended to be illustrative of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Those of ordinary skill in the art will understand that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
In the description of the present disclosure, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and, therefore, should not be taken as limiting the present disclosure.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.
In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present disclosure can be understood as a specific case by a person of ordinary skill in the art.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of a, B, and C, and may mean including any one or more elements selected from the group consisting of a, B, and C.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.

Claims (8)

1. An LED light pipe, comprising: the device comprises a capacitor unit, a buffer unit and at least one row pipe channel;
the row tube channel comprises an output current MOS tube, a switch unit and a control module; when the output current MOS tube is closed, the switch unit is opened, and the output end of the buffer unit and the first end of the capacitor unit are connected with the output end of the travelling tube channel through the opened switch unit and are used for setting the shadow eliminating potential of the travelling tube channel.
2. The LED row tube of claim 1, wherein the first end of the control module is an input end of the row tube channel;
the second end of the control module is connected with the first end of the output current MOS tube and is used for controlling the output current MOS tube to be opened and closed;
the third end of the control module is connected with the first end of the switch unit and is used for controlling the switch unit to be switched on and off;
and the second end of the switch unit and the second end of the output current MOS tube are both connected with the output end of the travelling tube channel.
3. The LED row tube of claim 1, wherein when the output current MOS tube is turned on, the switch unit is turned off, and the output of the row tube channel is the output of the output current MOS tube.
4. The LED row tube of claim 1, wherein said buffer unit comprises an operational amplifier, wherein an anode of said operational amplifier is a VUPDN input, a cathode of said operational amplifier is connected to an output of said operational amplifier, and an output of said operational amplifier is an output of said buffer unit.
5. The LED row tube of claim 4, wherein the output current MOS tube is an N-type field effect tube; the buffer unit further comprises a first output unit; the negative electrode of the operational amplifier is a VUPnPN input end, the positive electrode of the operational amplifier is connected with the first end of the first output unit, and the first end of the first output unit is used as the output end of the buffer unit.
6. The LED row tube of claim 4, wherein the output current MOS tube is a P-type field effect transistor; the buffer unit further comprises a second output unit; the negative electrode of the operational amplifier is a VUPnPn input end, the positive electrode of the operational amplifier is connected with the first end of the second output unit, the first end of the second output unit is used as the output end of the buffer unit, and the second end of the second output unit is grounded.
7. The LED light tube as claimed in claim 1, wherein the second end of the capacitor unit is grounded, or the second end of the capacitor unit is connected to a power supply.
8. An LED display screen, characterized in that, includes LED lamp plate and the LED tubulation of any one of claims 1-7.
CN202210952411.5A 2022-08-09 2022-08-09 LED (light-emitting diode) row tube and LED display screen Pending CN115148149A (en)

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CN202210952411.5A CN115148149A (en) 2022-08-09 2022-08-09 LED (light-emitting diode) row tube and LED display screen

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Application Number Priority Date Filing Date Title
CN202210952411.5A CN115148149A (en) 2022-08-09 2022-08-09 LED (light-emitting diode) row tube and LED display screen

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115294928A (en) * 2022-10-08 2022-11-04 成都利普芯微电子有限公司 Shadow elimination circuit, line driving circuit and display screen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115294928A (en) * 2022-10-08 2022-11-04 成都利普芯微电子有限公司 Shadow elimination circuit, line driving circuit and display screen

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