CN117636791A - Light emitting diode display device - Google Patents
Light emitting diode display device Download PDFInfo
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- CN117636791A CN117636791A CN202310965687.1A CN202310965687A CN117636791A CN 117636791 A CN117636791 A CN 117636791A CN 202310965687 A CN202310965687 A CN 202310965687A CN 117636791 A CN117636791 A CN 117636791A
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- emitting diode
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- display device
- transistor switch
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- 239000000758 substrate Substances 0.000 claims description 33
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 8
- 239000010409 thin film Substances 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 4
- 239000003086 colorant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002096 quantum dot Substances 0.000 description 1
Classifications
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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
-
- 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)
- Led Devices (AREA)
Abstract
The invention provides a light-emitting diode display device, which comprises a system board, a driving power supply circuit unit, a grid circuit unit, a plurality of light-emitting diodes and a power switch unit. Particularly, the power switch unit is provided with a plurality of first transistor switches and at least one second transistor switch which are matched together to control the current conduction of the light emitting diode, the first transistor switches are arranged corresponding to the light emitting diode and are electrically connected with a first electrode of the light emitting diode, the at least one second transistor switch is electrically connected with a second electrode of the light emitting diode, two transistors are utilized to control the current conduction of the light emitting diode, the load quantity of the light emitting diode scanned each time is reduced, the power consumption is reduced, and the display picture quality of an LED screen is improved.
Description
Technical Field
The present invention relates to a display device, and more particularly, to a light emitting diode display device.
Background
Compared with the traditional light emitting component, the Light Emitting Diode (LED) has the advantages of small volume, high brightness, low heat productivity, power saving and the like, and has become the mainstream of lighting and light sources in recent years. The driving method of the conventional LED display device is broadly divided into two types of Passive Matrix (Passive Matrix) addressing driving and Active Matrix (Active Matrix) addressing driving. The Active Matrix addressing driving means that there is an independent display driving circuit in each pixel region.
When the active matrix driving circuit is used as the most basic 2T1C (2 transducer 1 Capacitor) structure, one Transistor (T) is used as an LED current switch of the pixel circuit, and the other Transistor (T) is connected with a voltage source so as to provide stable current for the LED in the scanning time. In the conventional active matrix driving circuit, a transistor (T) is used as an LED current switch of a pixel circuit, however, when a transistor is used as an LED current on switch of each pixel, the number of equivalent Light Emitting Diodes (LEDs) is large during time-sharing scanning due to the influence of capacitive effect, which results in a problem of large power consumption.
In addition, when the led is applied to the display light source, not only is the transfer process time consuming, but also the tolerance problem of the transfer alignment is easily caused due to the miniaturization of the size and the huge amount required in the application, so that the huge amount of transfer becomes an important bottleneck in the commercialization of the current led/micro led. In addition, in the process of transferring the light emitting diode in large quantity, the circuit board used for transferring the bearing is easy to generate deformation or warping due to uneven stress born in the transferring process.
Disclosure of Invention
The invention aims to provide a light-emitting diode display device which can at least reduce the power consumption of a system.
The invention relates to a light-emitting diode display device, which comprises a system board, a driving power supply circuit unit, a grid circuit unit, a plurality of light-emitting diodes and a power switch unit.
The driving power circuit unit is arranged on the system board and is provided with a plurality of power lines which are arranged at intervals along a second direction and extend along a first direction intersecting the second direction.
The grid circuit unit is arranged on the system board and is provided with a first grid circuit and a second grid circuit which are electrically isolated from each other, the first grid circuit is provided with a plurality of first grid lines which are arranged at intervals along the first direction and extend along the second direction, and the second grid circuit is provided with a plurality of second grid lines which are arranged at intervals along the first direction and extend along the second direction.
The light emitting diodes are arranged on the system board and are arranged in rows and columns.
A power switch unit having a plurality of first transistor switches and at least one second transistor switch which are matched together to control the current conduction of the light emitting diode, wherein the first transistor switches are arranged corresponding to the light emitting diode and are electrically connected with a first electrode of the light emitting diode, the at least one second transistor switch is electrically connected with a second electrode of the light emitting diode,
the first transistor switch is also electrically connected with the driving power supply circuit unit and the first grid circuit respectively and used for providing driving current and receiving time sequence signals, and the at least one second transistor switch is also electrically connected with the second grid circuit and used for receiving time sequence signals.
Preferably, the light emitting diode display device of the present invention, wherein the light emitting diodes are arranged in a plurality of strings of diode strings arranged at intervals along the first direction and extending along the second direction, the power switch unit has a plurality of second transistor switches, and each string of the diode strings is correspondingly provided with at least one second transistor switch electrically connected to the light emitting diode of the diode string.
Preferably, the led display device of the present invention includes a plurality of sub-carriers assembled on the system board, each sub-carrier has at least one string of diodes, the leds are disposed on the sub-carrier and arranged on the system board in rows and columns, and the first transistor switch and the second transistor switch are disposed on the sub-carrier.
Preferably, the light emitting diode display device of the present invention further has a ground line, and the driving power circuit unit, the first gate circuit, the second gate circuit, and the ground line are directly disposed on the system board.
Preferably, in the light emitting diode display device of the present invention, the gate of the first transistor switch is electrically connected to the first gate circuit, the source and the drain are respectively electrically connected to the driving power circuit unit and the corresponding light emitting diode, and the gate of the at least one second transistor switch is electrically connected to the second gate circuit.
Preferably, in the light emitting diode display device of the present invention, the gate electrode of the first transistor switch and the gate electrode of the at least one second transistor switch electrically connected to the light emitting diodes of the same string of diodes are electrically connected to the corresponding first gate line and the second gate line, respectively, and the first transistor switch electrically connected to the light emitting diodes arranged in the first direction of the same column is electrically connected to the corresponding power line.
Preferably, the light emitting diode display device of the present invention further has a ground line, the power switching unit has a plurality of second transistor switches respectively corresponding to and electrically connected to each of the light emitting diodes, a source of each of the second transistor switches is electrically connected to a positive electrode of the corresponding light emitting diode, and a drain of the second transistor switch is electrically connected to a negative electrode of the light emitting diode and the ground line.
Preferably, the light emitting diode display device of the present invention, wherein the second transistor switches corresponding to the same string of diode strings are electrically connected to each other and to the ground line.
Preferably, the light emitting diode display device of the present invention, wherein the light emitting diodes of each of the diode strings are electrically connected to each other in a common cathode or common anode manner.
Preferably, the light emitting diode display device of the present invention, wherein the driving power circuit unit further has a driving IC electrically connected to the power line, and the driving IC may be driven for a common cathode or a common anode corresponding to the light emitting diode to control the supply of the driving current to the power line.
Preferably, the light emitting diode display device of the present invention, wherein the system board further comprises a timing control unit electrically connected to the driving power circuit unit and the gate circuit unit, respectively.
Preferably, the light emitting diode display device of the present invention, wherein the sub-carrier has a substrate selected from a glass substrate, a silicon substrate, or a circuit board; and the system board is selected from a silicon substrate, a glass substrate, or a flexible substrate.
Preferably, the light emitting diode display device of the present invention, wherein the light emitting diode is a packaged die.
The invention has the beneficial effects that: by using two transistor switches to control the current conduction of each light emitting diode, each light emitting diode can be regarded as independent, so that the load quantity of the light emitting diode in each scanning is reduced, the power consumption is effectively reduced, and the display picture quality of the LED screen is improved.
Drawings
FIG. 1 is a schematic top view illustrating a first embodiment of a light emitting diode display device of the present invention;
FIG. 2 is a schematic partial top view, aided by the illustration of FIG. 1;
FIG. 3 is a partial top view schematic diagram illustrating a second embodiment of the light emitting diode display device of the present invention;
FIG. 4 is a schematic top view illustrating a third embodiment of the LED display device of the present invention;
FIG. 5 is a schematic partial top view, aided by the illustration of FIG. 4;
fig. 6 is a partial top view schematically illustrating a third embodiment of the light emitting diode display device of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Referring to fig. 1 and 2, a first embodiment of the LED display device of the present invention includes a system board 2, a driving power circuit unit 3, a timing control unit 4, a gate circuit unit 5, a plurality of Light Emitting Diodes (LEDs) 6, a power switch unit 7, and a ground line 8. Fig. 1 is a schematic top view of the first embodiment, and fig. 2 is a schematic diagram of a diode string 60 and a part of the electrical connection structure of the first embodiment.
The system board 2 may be selected from a silicon substrate, a glass substrate, or a flexible substrate.
The driving power circuit unit 3 and the timing control unit 4 are disposed on the system board 2. The driving power circuit unit 3 has a driving IC31 electrically connected to the timing control unit 4, and a plurality of power lines 32 electrically connected to the driving IC31, respectively, the power lines 32 are arranged at intervals along a second direction 12 and extend in the same direction along a first direction 11, and the driving IC31 can receive the timing signal provided from the timing control unit 4 and control the driving current provided to the power lines 32 accordingly. In the present embodiment, the first direction 11 is taken as the Y direction, and the second direction 12 is taken as the X direction, but the present invention is not limited thereto.
The gate circuit unit 5 is disposed on the system board 2, and has a first gate circuit 51 and a second gate circuit 52. The first gate circuit 51 has a first gate signal controller 511 electrically connected to the timing control unit 4, and a plurality of first gate lines G11 to G1n electrically connected to the first gate signal controller 511, respectively, and the second gate circuit 52 has a second gate signal controller 521 electrically connected to the timing control unit 4, and a plurality of second gate lines G21 to G2n electrically connected to the second gate signal controller 521, respectively.
Specifically, the first gate lines G11 to G1n and the second gate lines G21 to G2n extend in the same direction along the second direction 12 and are staggered with each other along the first direction 11. The two adjacent power lines 32 and the first gate line G1 define a set area together, and a plurality of set areas are defined on the system board 2 in a matrix arrangement.
The light emitting diodes 6 are respectively and correspondingly arranged on the surface of the system board 2 in rows and columns at intervals in the arrangement region, so as to form a plurality of diode strings 60 which extend along the second direction 12 and are arranged at intervals along the first direction 11. It should be noted that the light emitting diode 6 may be directly formed on the system board 2 by a semiconductor process; or transferring the unpackaged chips or packaged chips formed on other original epitaxial substrates to the system board 2 in a single chip/chip transfer mode or a single multi-chip/chip transfer mode by a transfer mode; or the led 6 may be formed on another transparent substrate in advance, and then disposed on the system board 2 in a flip-chip manner (i.e. the transparent substrate is opposite to the system board 2 and the transparent substrate is a light-emitting surface). By transferring a plurality of LEDs 6 at a time or transferring all LEDs 6 to be formed on the system board 2 at a time, the time consuming and alignment tolerance problems of mass transfer can be avoided. In addition, when a plurality of leds 6 are transferred at a time, the leds 6 may be configured as a common cathode or a common anode depending on the electrical connection relationship with the system board 2, and the driving IC31 may be driven as a common cathode or a common anode corresponding to the leds 6.
It should be noted that, the light emitting diode 6 may emit light colors of different wavelengths by using different light emitting materials, for example, the light emitting diode 6 may emit at least three light colors of red light (R), blue light (B) and green light (G), respectively; or the led 6 may be made of a short-wave luminescent material (blue or ultraviolet luminescent material) that emits the same light color, and then different light conversion materials, such as fluorescent powder or quantum dots, are disposed on the light emitting surface, and wavelength-converted to emit light colors (such as red light, blue light, green light, etc.) with different wavelengths. The materials and detailed structures of the light emitting diode 6 are well known to those skilled in the art, and thus will not be described in detail.
The power switch unit 7 has a plurality of first transistor switches T1 and a plurality of second transistor switches T2 for controlling the current conduction of the light emitting diode 6.
Specifically, the first transistor switches T1 are respectively disposed corresponding to each of the light emitting diodes 6 and are respectively and electrically connected to a first electrode (not shown) of each of the light emitting diodes 6, and at least one second transistor switch T2 electrically connected to the light emitting diode 6 of the diode string 60 is disposed in each of the diode strings 60. The first transistor switch T1 is further electrically connected to the driving power circuit unit 3 and the first gate circuit 51, respectively, for providing a driving current and receiving a timing signal, and each second transistor switch T2 is further electrically connected to the second gate circuit 52, for receiving a timing signal. In the first embodiment, the power switch unit 7 has a plurality of first transistor switches T1 and second transistor switches T2 respectively corresponding to each of the leds 6.
The first transistor switch T1 and the second transistor switch T2 are Field effect transistors (Field-Effect Transistor, FETs). For example, the first Transistor switch T1 and the second Transistor switch T2 may be Thin Film Transistors (TFTs) and may be directly formed on the system board 2 through a semiconductor process, and the first Transistor switch T1 and the second Transistor switch T2 may be N-type TFTs or P-type TFTs depending on the material of the system board 2. For example, when the system board 2 is a glass substrate and the material deposited on the surface of the system board is Amorphous silicon (Si), the first transistor switch T1 and the second transistor switch T2 may be N-type thin film transistors only; when the material deposited on the surface of the system board 2 is Low Temperature Polysilicon (LTPS), an N-type thin film transistor and a P-type thin film transistor may be alternatively used; when the system board 2 is a silicon substrate, either an N-type thin film transistor or a P-type thin film transistor may be used. Since the materials and the related semiconductor processes of the first transistor switch T1 and the second transistor switch T2 are well known to those skilled in the art, the description thereof will not be repeated.
More specifically, taking the first transistor switch T1 and the second transistor switch T2 as P-type thin film transistors, the light emitting diodes 6 are arranged in rows and columns in the system board 2 at intervals, the first electrode of the light emitting diode 6 is a positive electrode, the second electrode is a negative electrode and a common cathode structure as an example, the electrical connection manner of the light emitting diode 6 is as follows: the positive electrode of each light emitting diode 6 is electrically connected with the drain electrode of the corresponding first transistor switch T1 and the source electrode of the second transistor switch T2 respectively; the sources of the first transistor switches T1 of the light emitting diodes 6 arranged along the first direction 11 (column) are electrically connected to the same corresponding power line 32 for providing a driving current; the gate of the first transistor switch T1 corresponding to the same string of diode strings 60 is electrically connected to the same corresponding first gate line G11, and the gate of the second transistor switch T2 corresponding to the same string of diode strings 60 is electrically connected to the same corresponding second gate line G21 to receive the timing signal; the negative electrode of the light emitting diode 6 and the drain of the corresponding second transistor switch T2 of the same diode string 60 are electrically connected to the ground line 8.
Referring to fig. 1 and 2 again, taking the circuit layout structure shown in fig. 1 as an example, the driving IC31 is an LED driver with time-sharing multi-row constant current scanning (time-multiplexing constant current), and taking the first gate line G11 and the second gate line G21 as an example, when the light emitting diode display device of the present invention is used for time-sharing scanning, the driving IC31 can provide constant current to the power line 32 according to the timing signal received from the timing control unit 4, the first gate line G11 and the second gate line G21 respectively receive the timing signals provided from the first gate signal controller 511 and the second gate signal controller 521, and turn on the corresponding first transistor switch T1 and turn off the second transistor switch T2 connected to the second gate line G21 so as to drive current to the corresponding light emitting diode 6; and then, in conjunction with the second gate signal controller 521, provides another timing signal to the remaining second gate lines G22 to G2n, and turns on the second transistor switch T2 electrically connected to the remaining second gate lines G22 to G2n, so as to disconnect the led 6 with current conduction from the led 6 with no current conduction, so that the number of led 6 loads seen by the driver IC31 at the time (e.g., frame rate=60 hz, time-multiplexing 180scans,1scan time =1/(60×180) =92.59 μs) is 1 led 6 load. Compared with the traditional LED current conduction control with a single transistor as a pixel circuit, the LED load seen by the LED driver at 180scan is 180 LEDs due to the influence of capacitance effect. Therefore, the LED display device of the invention can reduce the equivalent load quantity of the LEDs 6 during time-sharing scanning, thereby effectively reducing power consumption and improving display quality.
When the first and second transistor switches T1 and T2 are N-type thin film transistors, the positive electrode of each light emitting diode 6 is electrically connected to the source electrode of the first transistor switch T1 and the drain electrode of the second transistor switch T2, respectively, the power line 32 is electrically connected to the drain electrode of the first transistor switch T1, and the negative electrode of the light emitting diode 6 and the source electrode of the second transistor switch T2 are electrically connected to the ground line 8. The time-sharing scanning control mode is the same as that described above, and therefore will not be described again.
Referring to fig. 3, a second embodiment of the led display device of the present invention has a structure and electrical connection manner substantially the same as those of the first embodiment, except that the led 6 of the second embodiment is connected to the second transistor switch T2, wherein fig. 3 only shows a partial top view of one of the diode strings 60 and a part of the electrical connection components.
In detail, the second embodiment is the same as the first embodiment, and has a plurality of leds 6 and corresponding first transistor switches T1 electrically connected to the leds 6, wherein the second embodiment has only one second transistor switch T2 in the same diode string 60. That is, all the leds 6 of each diode string 60 are electrically connected to the same second transistor switch T2. As shown in fig. 3, taking the first transistor switch T1 and the second transistor switch T2 as P-type transistors as an example, the positive electrode of each light emitting diode 6 is electrically connected to the drain electrode of the corresponding first transistor switch T1, and the gate electrode of the first transistor switch T1 of the light emitting diode 6 in the same diode string 60 is electrically connected to the same corresponding first gate line G11; the negative electrode of the led 6 is connected to the source electrode of the second transistor switch T2 through an electrical connection wire, the drain electrode of the second transistor switch T2 is electrically connected to the ground line 8 (shown in fig. 1), and the gate electrode of the second transistor switch T2 is electrically connected to a corresponding second gate line G21 to receive the timing signal. The object of the invention is also achieved by having the leds 6 share a second transistor switch T2 as a current conducting switch.
Referring to fig. 2, 4 and 5, a third embodiment of the led display device of the present invention includes the same system board 2, driving power circuit unit 3, timing control unit 4, gate circuit unit 5, led 6, power switch unit 7, and ground line 8 as the first embodiment. The difference between the third embodiment and the first embodiment is that the leds 6 are disposed on the sub-carrier 90, and then the sub-carrier 90 is assembled on the system board 2. Fig. 4 is a schematic top view of the third embodiment, and fig. 5 is a schematic partial electrical connection structure of one of the sub-carrier boards 90 of the third embodiment.
Specifically, each sub-carrier 90 has a substrate 91 and a plurality of led units 92 disposed on the substrate 91.
The substrate 91 may be a glass substrate, a silicon substrate, a circuit board, or the like, and the first transistor switch T1 and the second transistor switch T2 are formed in advance through a semiconductor process. Each group of led units 92 has an led 6, and two first transistor switches T1 and a second transistor switch T2 electrically connected to the led 6 for controlling the current conduction of the led 6.
When the sub-carrier 90 is assembled on the system board 2, the leds 6 are arranged in rows and columns on the system board 2.
Since the related structures, compositions and connection manners of the driving power circuit unit 3, the timing control unit 4, the gate circuit unit 5, the power switch unit 7 and the ground line 8 are the same as those of the first embodiment, the description thereof will not be repeated.
The light emitting diodes 6 on the same substrate 91 may be unpackaged chips or packaged dies, and the light emitting diodes 6 may be configured as a common cathode or a common anode depending on the electrical connection relationship with the substrate 91, and the driving ICs 31 may be driven as a common cathode or a common anode corresponding to the light emitting diodes 6.
In assembly, a plurality of leds 6 formed on another substrate are transferred to a plurality of corresponding substrates 91, the first transistor switch T1 and the second transistor switch T2 are formed on the substrates 91 in advance, and the leds 6 transferred to the substrates 91 are electrically connected to the corresponding first transistor switch T1 and second transistor switch T2 to obtain the sub-carrier 90. Then, the required number of sub-carrier boards 90 are assembled on the system board 2 and then electrically connected with the driving power circuit unit 3, the timing control unit 4, the gate circuit unit 5 and the grounding circuit 8, respectively, so that the light emitting diode display device of the invention can be obtained by using an assembling mode.
Referring to fig. 6, a fourth embodiment of the led display device of the present invention has a structure and electrical connection manner substantially the same as those of the third embodiment, except that the fourth embodiment is used for connecting the leds 6 of the sub-carrier 90 mounted on the system board 2 with the second transistor switch T2. Fig. 6 shows only a part of the electrical connection structure of one of the sub-carrier boards 90 in the fourth embodiment.
In detail, the sub-carrier 90 of the fourth embodiment is the same as the sub-carrier 90 of the third embodiment, and has a plurality of leds 6 and corresponding first transistor switches T1 electrically connected to the leds 6, wherein all the leds 6 on the same sub-carrier 90 of the fourth embodiment share a second transistor switch T2. That is, only one second transistor switch T2 is disposed on each sub-carrier 90, and all the leds 6 are electrically connected to the second transistor switch T2. As shown in fig. 6, taking the first transistor switch T1 and the second transistor switch T2 as P-type transistors as an example, the anodes of the light emitting diodes 6 are respectively electrically connected with the drains of the corresponding first transistor switches T1, and the gates of the first transistor switches T1 of the light emitting diodes 6 arranged in the same row (row) are electrically connected with the same corresponding first gate line G1; the negative electrode of the light emitting diode 6 is connected through an electrical connection wire and then connected to the source electrode of the second transistor switch T2 in parallel, and the second transistor switch T2 is electrically connected with the grounding circuit 8 through the connection wire; the gate of the second transistor switch T2 is electrically connected to a corresponding second gate line G2 to receive the timing signal. The object of the invention is also achieved by having the leds 6 share a second transistor switch T2 as a current conducting switch.
In summary, in the present invention, each led 6 uses 2 transistors (T1, T2) as the switch for controlling the current conduction of the led 6, so that each led 6 with current conduction can be disconnected from the rest leds L not being current-conducted during the time-sharing scanning, so as to reduce the load quantity of the leds 6 during the time-sharing scanning, and effectively reduce the power consumption and improve the display quality of the display. In addition, the LED display device of the present disclosure may further form a plurality of sub-carrier boards 90 provided with a plurality of LEDs 6 in advance by a pre-assembly method, and then assemble the sub-carrier boards 90 to the system board 2, so that the time required for transferring a large number of individual LEDs to the carrier board in the conventional LED display device can be reduced, and the problem of warp deformation caused by uneven stress of the carrier board (e.g. the system board 2) carrying the LEDs in the process of transferring a large number of LEDs can be avoided, which is easier to apply, and the purpose of the present disclosure can be achieved.
However, the foregoing is merely illustrative of the present invention and, as such, it is not intended to limit the scope of the invention, but rather to cover all modifications and variations within the spirit and scope of the present invention as defined by the appended claims and their equivalents.
Claims (13)
1. A light emitting diode display device characterized in that: comprises the following steps of;
a system board;
a driving power circuit unit disposed on the system board and having a plurality of power lines arranged at intervals along a second direction and extending along a first direction intersecting the second direction;
the grid circuit unit is arranged on the system board and is provided with a first grid circuit and a second grid circuit which are electrically isolated from each other, the first grid circuit is provided with a plurality of first grid lines which are arranged at intervals along the first direction and extend along the second direction, and the second grid circuit is provided with a plurality of second grid lines which are arranged at intervals along the first direction and extend along the second direction;
a plurality of light emitting diodes arranged on the system board and arranged in rows and columns; and
A power switch unit having a plurality of first transistor switches and at least one second transistor switch which are matched together to control the current conduction of the light emitting diode, wherein the first transistor switches are arranged corresponding to the light emitting diode and are electrically connected with a first electrode of the light emitting diode, the at least one second transistor switch is electrically connected with a second electrode of the light emitting diode,
the first transistor switch is also electrically connected with the driving power supply circuit unit and the first grid circuit respectively and used for providing driving current and receiving time sequence signals, and the at least one second transistor switch is also electrically connected with the second grid circuit and used for receiving time sequence signals.
2. A light emitting diode display device according to claim 1, wherein: the light emitting diodes are arranged into a plurality of strings of diode strings which are arranged at intervals along the first direction and extend along the second direction, the power switch unit is provided with a plurality of second transistor switches, and each string of diode strings is correspondingly provided with at least one second transistor switch which is electrically connected with the light emitting diode of the diode string.
3. A light emitting diode display device according to claim 2, wherein: the light emitting diode display device further comprises a plurality of sub-carrier plates which are assembled on the system board, each sub-carrier plate is provided with at least one string of diode strings, the light emitting diodes are arranged on the sub-carrier plates to form rows and columns which are arranged on the system board, and the first transistor switch and the second transistor switch are arranged on the sub-carrier plates.
4. A light emitting diode display device according to claim 1, wherein: the light emitting diode display device further has a ground line, and the driving power circuit unit, the first gate circuit, the second gate circuit, and the ground line are directly disposed on the system board.
5. A light emitting diode display device according to claim 2 or 3, wherein: the grid electrode of the first transistor switch is electrically connected with the first grid electrode circuit, the source electrode and the drain electrode are respectively electrically connected with the driving power supply circuit unit and the corresponding light-emitting diode, and the grid electrode of the at least one second transistor switch is electrically connected with the second grid electrode circuit.
6. A light emitting diode display device according to claim 5, wherein: the gates of the first transistor switch and the gates of the at least one second transistor switch electrically connected to the light emitting diodes of the same string of diode strings are electrically connected to the corresponding first gate line and the second gate line, respectively, and the first transistor switch electrically connected to the light emitting diodes arranged in the same column along the first direction is electrically connected to the corresponding power line.
7. A light emitting diode display device according to claim 2 or 3, wherein: the power switch unit is provided with a plurality of second transistor switches which are respectively and correspondingly electrically connected with each light emitting diode, the source electrode of each second transistor switch is electrically connected with the anode of the corresponding light emitting diode, and the drain electrode is electrically connected with the cathode of the light emitting diode and the grounding circuit.
8. A light emitting diode display device according to claim 7, wherein: the second transistor switches corresponding to the same string of diode strings are electrically connected to each other and to the ground line.
9. A light emitting diode display device according to claim 2 or 3, wherein: the light emitting diodes of each string of diode strings are electrically connected to each other in a common cathode or common anode manner.
10. A light emitting diode display device according to claim 9, wherein: the driving power circuit unit is also provided with a driving IC electrically connected with the power line, and the driving IC corresponds to the light emitting diode and is driven by a common cathode or a common anode so as to control the supply of driving current to the power line.
11. A light emitting diode display device according to claim 1, wherein: the system board also comprises a time sequence control unit which is respectively and electrically connected with the driving power supply circuit unit and the grid circuit unit.
12. A light emitting diode display device according to claim 3, wherein: the sub-carrier plate is provided with a substrate, wherein the substrate is selected from a glass substrate, a silicon substrate or a circuit board; and the system board is selected from a silicon substrate, a glass substrate, or a flexible substrate.
13. A light emitting diode display device according to claim 1, wherein: the light emitting diode is a packaged die.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW111132111 | 2022-08-25 | ||
| TW112100082 | 2023-01-03 | ||
| TW112100082A TW202429421A (en) | 2023-01-03 | Luminescent display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117636791A true CN117636791A (en) | 2024-03-01 |
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ID=90017086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310965687.1A Pending CN117636791A (en) | 2022-08-25 | 2023-08-02 | Light emitting diode display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117636791A (en) |
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2023
- 2023-08-02 CN CN202310965687.1A patent/CN117636791A/en active Pending
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