CN112509476A - Micro light emitting diode display device - Google Patents

Micro light emitting diode display device Download PDF

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Publication number
CN112509476A
CN112509476A CN202011373084.5A CN202011373084A CN112509476A CN 112509476 A CN112509476 A CN 112509476A CN 202011373084 A CN202011373084 A CN 202011373084A CN 112509476 A CN112509476 A CN 112509476A
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Prior art keywords
voltage
pixel group
display panel
micro
display device
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CN202011373084.5A
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CN112509476B (en
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刘应苍
廖冠咏
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Chuangchuang Display Technology Co ltd
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Chuangchuang Display Technology Co ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • 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]

Abstract

The invention discloses a micro light emitting diode display device which comprises a display panel and a driving circuit. The display panel comprises a plurality of pixel group units arranged side by side along a first direction, and each pixel group unit is provided with a plurality of pixels in an extending mode in a second direction. The driving circuit outputs a first voltage and a second voltage to be transmitted to the pixels of each pixel group unit of the display panel; the display panel has a first side and a second side opposite to each other in a second direction, a first voltage is introduced to the display panel from the first side, a second voltage is introduced to the display panel from the second side, and a voltage difference between the first voltage and the second voltage is positively related to the brightness of one of the connected pixels.

Description

Micro light emitting diode display device
Technical Field
The present invention relates to a display device, and more particularly, to a micro light emitting diode display device.
Background
Micro light emitting diodes (Micro LEDs) are one of the best technologies seen when the world is focusing on future display technologies. In brief, Micro LEDs are a technology for miniaturizing and matrixing LEDs, and millions or even tens of millions of grains smaller than 100 micrometers and thinner than one hair are arranged and placed on a substrate. Compared with the current OLED (organic light emitting diode) display technology, the Micro LED is self-luminous, but the used materials are different, so that the most fatal 'branding' problem of the OLED can be solved, and the Micro LED has the advantages of low power consumption, high contrast, wide color gamut, high brightness, small volume, light weight, thinness, energy conservation and the like. Therefore, various major factories are strived to develop Micro LED technology.
However, while Micro LEDs offer various advantages, there are still some technical obstacles to overcome. For example, in a large-size, high-resolution, high-frequency Micro LED display, the uneven brightness of the driving voltage input to each pixel due to the voltage drop generated by the difference of the pixel position in the panel is still a problem that cannot be ignored in the Micro LED display.
Therefore, it is an important subject of the industry to provide a micro led display device that can overcome the brightness non-uniformity caused by the driving voltage drop and further improve the display quality.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a micro light emitting diode display device capable of improving the uneven brightness caused by the driving voltage drop and further improving the display quality.
To achieve the above objective, a micro led display device according to the present invention includes a display panel and a driving circuit. The display panel comprises a plurality of pixel group units arranged side by side along a first direction, each pixel group unit is provided with a plurality of pixels in an extending mode in a second direction, and the first direction is different from the second direction; the driving circuit is electrically connected with the display panel and outputs a first voltage and a second voltage to be transmitted to the pixels of each pixel group unit of the display panel; the display panel has a first side and a second side opposite to each other in a second direction, a first voltage is introduced to the display panel from the first side, a second voltage is introduced to the display panel from the second side, and a voltage difference between the first voltage and the second voltage is positively related to the brightness of one of the connected pixels.
In one embodiment, the first voltage is greater than the second voltage.
In one embodiment, the first voltage is a driving voltage of the pixel group units, and the second voltage is a common voltage of the pixel group units.
In one embodiment, the first voltage is sequentially transmitted to the pixels of each pixel group unit along the second direction.
In one embodiment, the second voltage is sequentially transmitted to the pixels of each pixel group unit along a direction opposite to the second direction.
In an embodiment, the display panel further includes a plurality of first connection lines extending along the second direction, and the first voltage is transmitted to the pixel group units through the first connection lines.
In one embodiment, the first connecting lines are disposed corresponding to the pixel group units.
In an embodiment, the display panel further includes a plurality of second connection lines extending along a second direction, and the second voltage is transmitted to the pixel group units through the second connection lines along a direction opposite to the second direction.
In one embodiment, the second connecting lines are disposed corresponding to the pixel group units.
In an embodiment, the micro led display device further includes at least one wire, and the second voltage is introduced to the display panel from the second side of the display panel through the at least one wire.
In one embodiment, the at least one conductive line is connected to the second connecting lines.
In an embodiment, the number of the conductive lines is multiple, the pixel group units are divided into a plurality of regions in the first direction, and the conductive lines are arranged corresponding to the regions.
In one embodiment, the number of the conductive wires is multiple, and the conductive wires and the second connecting wires are arranged correspondingly.
In one embodiment, the micro led display device further includes a plurality of data lines, the driving circuit includes a data driving circuit, and the data driving circuit outputs a data signal to the pixel group units through the data lines.
In an embodiment, the micro led display device further includes a plurality of scan lines and a scan driving circuit, the scan driving circuit is electrically connected to the display panel, and the scan driving circuit outputs a scan signal to the pixel group units through the scan lines.
As described above, in the micro light emitting diode display device according to the present invention, the display panel includes a plurality of pixel group units arranged side by side in a first direction, and each of the pixel group units has a plurality of pixels extending in a second direction different from the first direction; the driving circuit outputs a first voltage and a second voltage to be transmitted to the pixels of each pixel group unit of the display panel; and the first voltage output by the driving circuit is led into the display panel from the first side of the display panel, the second voltage output by the driving circuit is led into the display panel from the second side opposite to the first side, and the voltage difference between the first voltage and the second voltage is positively related to the brightness of one of the connected pixels, so that the voltage difference for driving the micro light-emitting diodes in the pixels at different positions of each pixel group unit along the second direction cannot be too large due to the pixels at different positions, and the brightness difference emitted by the micro light-emitting diodes of each pixel group unit is not large, therefore, the uneven brightness phenomenon caused by the voltage drop of the driving voltage of the micro light-emitting diode display device in the prior art can be improved, and the display quality can be improved.
Drawings
Fig. 1 is a schematic diagram of a micro led display device according to an embodiment of the invention.
Fig. 2 is a circuit diagram of four adjacent pixels in two pixel group units of the micro led display device shown in fig. 1.
Fig. 3 is a schematic diagram of driving voltage drops of pixels at different positions in a pixel group unit of a micro led display device in the prior art.
Fig. 4 is a schematic view of a driving voltage drop of each pixel in a pixel group unit of the micro led display device shown in fig. 1.
FIG. 5 is a schematic diagram of driving voltage differences of pixels at different positions in a pixel group unit according to the prior art and the present invention.
FIG. 6 is a schematic diagram of a micro LED display device according to various embodiments of the present invention.
Detailed Description
A micro-led display device according to some embodiments of the present invention will be described with reference to the accompanying drawings, wherein like elements are designated by like reference numerals.
Fig. 1 is a schematic diagram of a micro led display device according to an embodiment of the invention, and fig. 2 is a circuit diagram of four adjacent pixels in two pixel group units of the micro led display device of fig. 1.
Referring to fig. 1 and fig. 2, the micro led display device 1 of the present embodiment is an Active Matrix (Active Matrix) micro led display device, which may include a display panel 11 and a driving circuit 12. In addition, the micro led display device 1 of the present embodiment further includes a scan driving circuit 13.
The display panel 11 is a micro led display panel, which includes a plurality of micro leds, and when the micro leds are driven or lighted, the display panel 11 can display images. The display panel 11 includes a plurality of pixel group units P arranged side by side along a first direction D11～Pn(n is a positive integer greater than 1), each pixel group unit P1～PnA plurality of pixels extend in a second direction D2, and the first direction D1 is different from the second direction D2. In the embodiment, the first direction D1 and the second direction D2 are perpendicular to each other, but not limited thereto, in different embodiments, the first direction D1 and the second direction D2 may not be perpendicular to each other, for example, an included angle therebetween is an acute angle.
Specifically, the pixel group unit P of the present embodiment1～PnArranged side by side along a first direction D1 (here, a horizontal direction) in a display area of the display panel 11, each pixel group unit P1～PnEach including a plurality of pixels arranged along a second direction D2 (vertical direction in this case), and each pixel has at least one micro-pixelA light emitting diode. By pixel group unit P1For example, it includes a pixel P arranged to extend along the second direction D211～P1m(m is a positive integer greater than 1); then, the pixel group unit Pn-2For example, it includes a pixel P arranged to extend along the second direction D2(n-2)1～P(n-2)mAnd so on. Due to the pixel group unit P1～PnArranged side by side along a first direction D1, and each pixel group unit P1～PnEach having m pixels arranged extending in the second direction D2, the display panel 11 has n × m pixels P in total11～Pnm. The pixel P of the display panel 11 of the present embodiment11～PnmThe array is formed of rows (columns, second direction D2) and columns (Row, first direction D1). In addition, the display panel 11 further has a first side a1, a second side a2, a third side A3 and a fourth side a4, the first side a1 is opposite to the second side a2 in the second direction D2, the third side A3 is opposite to the fourth side a4 in the first direction D1, the third side A3 is connected to the first side a1 and the second side a2, and the fourth side a4 is connected to the first side a1 and the second side a 2.
The driving circuit 12 is disposed adjacent to the first side a1 of the display panel 11 and electrically connected to the display panel 11. The driving circuit 12 can output a first voltage VDDAnd a second voltage VSSEach pixel group unit P respectively transmitted to the display panel 111～PnThe plurality of pixels. Wherein the first voltage VDDThe second voltage V is introduced into the display panel 11 from the first side A1 of the display panel 11SSThe first voltage V is introduced into the display panel 11 from the second side A2 of the display panel 11DDAnd a second voltage VSSIs positively correlated to the brightness of the connected one of the pixels. Here, the first voltage VDDAnd a second voltage VSSThe voltage difference of (a) and the brightness of the connected pixel show a positive correlation, that is, the first voltage VDDAnd a second voltage VSSThe larger the voltage difference, the larger the brightness of the pixel; conversely, the first voltage VDDAnd a second voltage VSSWhen the voltage difference ofThe brightness of the pixel is also relatively small.
Specifically, the driving circuit 12 of the present embodiment includes a data driving circuit 121 and a power supply circuit 122. A first voltage VDDAnd a second voltage VSSIs provided by the power supply circuit 122. A first voltage VDDFor driving the pixel group unit P1～PnThe pixels P11～PnmThe light emitting element (i.e., micro light emitting diode) emits light, and the second voltage VSSIs a pixel group unit P1～PnThe pixels P11～PnmAnd a first voltage VDDAnd a second voltage VSSThe light is guided into the display panel 11 from two opposite sides (A1, A2) of the display panel 11. Herein, the first voltage VDDGreater than the second voltage VSS. In the present embodiment, the first voltage VDDE.g. 4.6V, second voltage VSSFor example, -2V, but not limited thereto, in different embodiments, different first voltages V may be provided according to the characteristics of the driven micro-ledsDDAnd a second voltage VSS。
The first voltage V output by the power supply circuit 122 of the present embodimentDDThe first side A1 of the display panel 11 is led into the display panel 11 via a conducting wire C1, and then passes through a plurality of first connecting wires (see C in FIG. 2)q、Cq+1) To the pixel group unit P1～PnThe pixels P11～PnmAnd (6) electrically connecting. Herein, the first voltage VDDSequentially transmitted to each pixel group unit P through each in-plane first connection line along the second direction D21～PnThe plurality of pixels. In addition, the second voltage V output by the power supply circuit 122 of the present embodimentSSThe second side A2 of the display panel 11 is led into the display panel 11 through at least one conductive line C2, and the display panel 11 further includes a plurality of second connection lines (e.g. E in FIG. 2)q、Eq+1) The wires C2 are respectively connected to the second connecting wires and the second voltage VSSThrough the conductive line C2 and the second connecting lines in the planeIs transmitted to each pixel group unit P along the direction opposite to the second direction D21～PnThe plurality of pixels.
In addition, the micro led display device 1 of the present embodiment further includes a plurality of data lines D1～DnThe data driving circuit 121 passes through the data lines D1～DnIs electrically connected to the display panel 11. Therefore, the data driving circuit 121 can pass through the data lines D1～DnRespectively outputting a data signal to the pixel group units P of the display panel 11 along the second direction D21～PnThe pixels P11～Pnm. In addition, the micro led display device 1 may further include a plurality of scan lines S1～SmThe scan driving circuit 13 is disposed adjacent to the third side A3 of the display panel 11, and the scan driving circuit 13 passes through the scan lines S1～SmIs electrically connected to the display panel 11. Therefore, the scan driving circuit 13 can pass through the scan lines S1～SmOutputting a scan signal to the pixel group unit P along the first direction D11～PnThe pixels P11～Pnm. In various embodiments, the scan driving circuit 13 may be disposed adjacent to the fourth side A4 and pass through the scan lines S1～SmIs electrically connected with the display panel 11; alternatively, the scan driving circuit 13 may be divided into two sub-driving circuits, and the two sub-driving circuits are disposed adjacent to the third side A3 and the fourth side a4 of the display panel 11, which is not limited in the present invention. In some embodiments, the data driving circuit 121 and the power supply circuit 122 may be independent driving chips; alternatively, the data driving circuit 121 and the power supply circuit 122 may be integrated into a single driving chip (i.e., the driving circuit 12 is a single chip); alternatively, the driving circuit 12 (the data driving circuit 121 and the power supply circuit 122) and the scan driving circuit 13 may be integrated into one driving chip, which is not limited in the present invention.
Therefore, when the scan driving circuit 13 outputs the scan signal to make the scan lines S1～SmRespectively turn on the pixels P11～PnmThe data driving circuit 121 may be coupled toShould each row of pixel group unit P1～PnThe data signal passes through the data lines D1～DnTo each pixel group unit P1～PnThe power supply circuit 122 can supply the first voltage V to the pixelsDDAnd a second voltage VSSTransmitted from the first side A1 and the second side A2 of the display panel 11 to each pixel group cell P via the in-plane first connecting line and the in-plane second connecting line through the corresponding wires C1, C21～PnTo drive or light the pixel group unit P1～PnThe pixels P11～PnmThe micro light emitting diode can further make the display device display images.
Referring to fig. 2, the detail of the micro led display device 1 of the above embodiment is shown, in which four consecutive pixels P of two adjacent pixel group unitsqr、Pq(r+1)、P(q+1)r、P(q+1)(r+1)The detailed circuit of (1). In FIG. 2, q may be between 1 and n-1 (1. ltoreq. q.ltoreq.n-1), r may be between 1 and m-1 (1. ltoreq. r.ltoreq.m-1)qr、Pq(r+1)And a pixel P(q+1)r、P(q+1)(r+1)Respectively arranged along a second direction D2, pixels Pqr、P(q+1)rAnd a pixel Pq(r+1)、P(q+1)(r+1)Respectively, in a first direction D1. Here, the pixel Pqr、Pq(r+1)、P(q+1)r、P(q+1)(r+1)For example, the circuit structure of 2T1C is taken as an example, but not limited thereto, and in different embodiments, the pixel may be other circuit structures, such as 3T1C, 6T1C, or 7T 1C.
In the present embodiment, the display panel 11 includes a plurality of first connection lines (fig. 2 shows two of the first connection lines C) extending in the second direction D2q、Cq+1) First voltage VDDThrough the first connecting lines (e.g. C)q、Cq+1) To the pixel group units P1～PnThe pixels P11～Pnm. Therefore, the conductive wires C1 in FIG. 1 are respectively connected with the first connecting wires C of FIG. 2q、Cq+1Is connected to connect the firstA voltage VDDAnd transmitting the data to the pixels of the corresponding pixel group unit. Here, the first connection lines are disposed corresponding to the pixel group units (one-to-one correspondence). In addition, the display panel 11 of the embodiment may further include a plurality of second connection lines (fig. 2 shows two second connection lines E) extending along the second direction D2q、Eq+1) Second voltage VSSThrough the second connecting lines (e.g. E)q、Eq+1) Is transmitted to the pixel group units P along the direction opposite to the second direction D21～PnThe pixels P11～Pnm. Therefore, the conductive wires C2 in FIG. 1 are respectively connected with the second connecting wires E in FIG. 2q、Eq+1Is connected to apply a second voltage VSSAnd transmitting the data to the pixels of the corresponding pixel group unit. Here, the second connection lines are disposed corresponding to the pixel group units (one-to-one correspondence).
It should be noted that the "wire", "first connecting line", or "second connecting line" mentioned herein may be a physical conductive line, or a line (e.g., a thin film line) which is formed by a circuit layer or a conductive layer and can conduct an electrical signal, and is not limited.
By pixel PqrFor example, it includes a micro led 21, a driving transistor 22, a switching transistor 23 and a capacitor 24. The driving transistor 22 is used as a driving element of the micro light emitting diode 21, and the source thereof is connected through the first connecting line CqIs connected to a first voltage VDDA drain connected to one end of the micro LED 21, and the other end of the micro LED 21 connected to the other end of the LED via a second connection line EqIs connected to a second voltage VSS. In addition, the gate of the switching transistor 23 and a scan line SrA drain connected to receive the scan signal and a data line DqConnected to receive data signal, and having its source electrically connected to one end of the capacitor 24 and the gate of the driving transistor 22, and the other end of the capacitor 24 connected to the first connection line CqAnd (4) connecting. Thereby, the switching transistor 23 can be driven by the scanning line SrIs turned on by the scanning signal to make the data signal pass through the data line DqThe gate of the drive transistor 22 is input via a switching transistor 23,to turn on the driving transistor 22 to make the first voltage VDDCan pass through the first connecting line CqAnd the driving transistor 22 is transmitted to one end of the micro light emitting diode 21, so that a voltage difference can be formed between the two ends of the micro light emitting diode 21, and the pixel P is formedqrIs turned on to emit light, and the first voltage VDDAnd a second voltage VSSIs positively correlated with the connected pixel PqrThe brightness of (2).
Specifically, the common voltage of the prior art is transmitted to the common electrode layer over the entire surface of the display panel, but the common voltage (the second voltage V) of the present embodiment isSS) Not to the whole common electrode layer, but to the second connecting lines corresponding to the pixel group units, and then to the first voltage V transmitted by the first connecting linesDDSimilarly, a voltage difference can be formed between two ends of the micro light emitting diodes of the pixels of each pixel group unit, so as to drive the micro light emitting diodes to emit light.
Fig. 3 is a schematic diagram showing driving voltage drops of pixels at different positions in a pixel group unit of a micro led display device in the prior art. In the prior art, the data driving circuit outputs the DC driving voltage and the common voltage (also referred to as the first voltage V herein)DDAnd a second voltage VSS) Is from the same side of the display panel (as the first side A1, i.e. the first voltage V shown in FIG. 3)DDAnd a second voltage VSSLocated at the first side a1) into the display panel. In a large-sized display panel, since the length of each connection line corresponding to the pixels of each pixel group unit along the second direction D2 is quite long, when the first voltage V is appliedDDWhen the display panel is introduced, the pixels of each pixel group unit generate voltage drops due to the internal impedance of the connecting wires and the common electrode layer. Therefore, the voltage difference for driving the micro-leds in the pixels at different positions along the second direction D2 in each pixel group unit will be different for the pixels at different positions. As shown in FIG. 3, the farther a pixel is from the signal input terminal A, the voltage difference between two ends of the micro-LED will beThe smaller the size, the uneven brightness of the pixels in each pixel group unit in the vertical direction (the second direction D2) is caused, resulting in the degradation of the display quality.
However, referring to fig. 1 again, in the micro led display device 1 of the present embodiment, the first voltage V output by the power supply circuit 122 of the driving circuit 12DDThe second voltage V outputted by the power supply circuit 122 is introduced into the display panel 11 from the first side A1 of the display panel 11SSIs led into the display panel 11 from the second side a2 of the display panel 11. Therefore, the voltage drop of the driving voltages of the pixels of each pixel group unit can be seen with reference to fig. 4 and 5. Fig. 4 is a schematic view of a driving voltage drop of each pixel in one pixel group unit of the micro led display device of the embodiment of fig. 1, and fig. 5 is a schematic view of a driving voltage difference of pixels at different positions in one pixel group unit in the prior art and the present invention.
In FIG. 4, Vp represents the first voltage VDDIs a positive voltage (here, for example, 4.6V), which passes through the first connection line CqThe light is transmitted from the first side A1 to the second side A2 of the display panel 11; vcom represents the second voltage VSSIs a negative voltage (here, for example, -2V), which passes through the second connection line EqFrom the second side A2 to the first side A1; x represents the xth pixel (m in total) in the second direction D2, and thus m driving transistors 22 and m micro light emitting diodes 21; Δ V1 to Δ Vm represent the voltage difference across the micro-leds 21 of the corresponding pixels; r represents a first connecting line C of a segmentqOr a second connecting line EqThe impedance of (a); i represents the current flowing through the resistance R. It is assumed herein that the characteristics of the driving transistor 22 of each pixel are equal, and the current I flowing through the micro led 21 of each pixel is also equal.
It can be calculated that the voltage difference between the two sides of the driving transistor 22 and the micro led 21 is not substantially different (or even equal) in the pixels at different positions of each pixel group unit in fig. 4. For example, in the pixel where x is 1, the first connection line C connecting the driving transistor 22 is connectedqA second connection line E with a voltage equal to Vp-mIR for connecting the micro-LED 21qThe voltage on the side is equal to Vcom +1/2 xm (m +1) xIR, and the voltage difference is equal to Vp-mIR-Vcom-1/2 xm (m +1) xIR; and in the pixel where x is m, the first connection line C of the driving transistor 22 is connectedqA second connection line E with a voltage equal to Vp-1/2 xm (m +1) xIR for connecting the micro-LED 21qThe voltage on the side is equal to Vcom + mIR, and the voltage difference is still equal to Vp-mIR-Vcom-1/2 xm (m +1) xIR; in other pixels at different positions, the first connecting line CqLateral voltage and second connecting line EqThe voltage difference on the side is not much different from the two positions (x is 1 and x is m).
In a practical embodiment, the first voltage V provided by the power supply circuit 122DDE.g. 4.6V, second voltage VSSFor example, -2V, m for example 100, and IR for example 0.0001V, in one of the pixel group units extending in the second direction D2, the first connection line C of the first pixel (x ═ 1) of the display panel 11qSide and second connecting line EqThe voltage difference (Δ V) on the side is 6.085V, the first connection line C of the pixel at position 1/4 (i.e. the 25 th pixel)qSide and second connecting line EqThe voltage difference (Δ V) at the side is 5.905V; the first connection line C of the pixel at position 1/2 (i.e., the 50 th pixel)qLateral voltage and second connection EqThe voltage difference (Δ V) on the side is 5.84V, and the first connection line C of the last pixel (x ═ m)qSide and second connecting line EqThe voltage difference (Δ V) on the side is 6.085V, which proves that the technology of the present invention can indeed make the driving transistor 22 and the micro-led 21 on both sides (i.e. the first connecting line C)qSide and second connecting line EqSide) of the first voltage, the first voltage V of the pixel at different positions is not reduced due to the difference from the signal input end ADDAnd a second voltage VSSThe difference in voltage of (a) is not large.
As shown in FIG. 5, Δ V is a first connecting line CqSide and second connecting line EqThe voltage difference of the sides. In the conventional method, the voltages (the first voltage and the second voltage) for driving the micro-LEDsVoltage) is introduced into the display panel from the same side of the display panel, and therefore, the farther away from the signal input terminal a, the pixel is subjected to a voltage drop due to the internal impedance of the common electrode layer itself of the common voltage and the connection line of the driving voltage, so that the voltage difference Δ V between the driving transistor 22 and the micro-light emitting diode 21 becomes smaller and smaller, resulting in uneven brightness. However, in the micro-led display device 1 of the present embodiment, the first voltage V is outputted from the power supply circuit 122DDThe second voltage V output by the power supply circuit 122 is introduced into the display panel 11 from the first side A1 of the display panel 11SSThe first voltage V is introduced into the display panel 11 from the second side A2 of the display panel 11DDAnd a second voltage VSSThe voltage difference is positively correlated to the brightness of the connected pixels, and in each pixel group unit P1～PnIn the pixels at different positions along the second direction D2, the driving transistor 22 and the micro light emitting diode 21 are disposed on both sides (i.e., the first connection line C)qSide and second connecting line EqSide) is not much different, and is not smaller (or larger) because of the difference at positions farther from the signal input terminal a. Therefore, the micro led display device 1 of the present embodiment can improve the prior art of each pixel group unit P1～PnThe uneven brightness of the micro light emitting diodes 21 can improve the display quality of the micro light emitting diode display device 1.
FIG. 6 is a schematic diagram of a micro LED display device according to various embodiments of the present invention. Here, in order to avoid the drawing being too complicated, fig. 6 does not show all the components (for example, the pixel group unit and the pixels are not shown).
As shown in fig. 6, the micro-led display device 1a of the present embodiment is substantially the same as the micro-led display device 1 of the previous embodiment in terms of the element composition and the connection relationship of the elements. The difference is that in the micro led display device 1a of the present embodiment, the second voltage V outputted by the power supply circuit 122SSThe light is guided into the display panel 11 from the second side A2 of the display panel 11 through a plurality of wires (e.g., 3 wires C21, C22, C23), and then is transmitted through the second connecting wires in the display areaTo the pixel group units. In addition, the pixel group units of the display panel 11 of the embodiment can be divided into a plurality of regions (e.g., 3 regions Z1, Z2, and Z3) along the first direction D1, and the conductive lines (C21, C22, and C23) are disposed corresponding to the regions (Z1, Z2, and Z3). The present invention is not limited to the above embodiments, and the embodiments may be a one-to-many or many-to-one correspondence.
Specifically, in the present embodiment, the second voltage V transmitted by the conductor C21SSA second voltage V transmitted by the conductor C22 and transmitted to the pixel group unit of the region Z1 via the in-plane corresponding second connection lineSSA second voltage V transmitted by the conductive line C23 and transmitted to the pixel group unit of the region Z2 via the in-plane corresponding second connection lineSSTo the pixel group cell of region Z3 by the in-plane corresponding second connection line. Therefore, although the pixel group units of the display panel 11 still correspond to the second connection lines, the second connection lines respectively corresponding to the three regions Z1, Z2, and Z3 are not connected to each other in the display region. By such a design, the pixels in the three regions Z1, Z2, and Z3 are less likely to generate the uneven brightness phenomenon in the first direction D1. Of course, in different embodiments, the second connection lines in the planes corresponding to the three zones Z1, Z2, and Z3 may also be connected to each other, and the invention is not limited thereto.
In some embodiments, the second voltage V is transmittedSSThe number of the conductive lines may also be equal to the number of the second connection lines or the pixel group units, and the conductive lines are correspondingly connected in a one-to-one manner (i.e., one conductive line corresponds to and is connected to one second connection line and one pixel group unit) so as to transmit the second voltage to each pixel group unit through each conductive line and each corresponding second connection line, which is not limited in the present invention.
In summary, in the micro led display device according to the present invention, the display panel includes a plurality of pixel group units arranged side by side along a first direction, and each pixel group unit has a plurality of pixels extending in a second direction different from the first direction; the driving circuit outputs a first voltage and a second voltage to be transmitted to the pixels of each pixel group unit of the display panel; and the first voltage output by the driving circuit is led into the display panel from the first side of the display panel, the second voltage output by the driving circuit is led into the display panel from the second side opposite to the first side, and the voltage difference between the first voltage and the second voltage is positively related to the brightness of one of the connected pixels, so that the voltage difference for driving the micro light-emitting diodes in the pixels at different positions of each pixel group unit along the second direction cannot be too large due to the pixels at different positions, and the brightness difference emitted by the micro light-emitting diodes of each pixel group unit is not large, therefore, the uneven brightness phenomenon caused by the voltage drop of the driving voltage of the micro light-emitting diode display device in the prior art can be improved, and the display quality can be improved.
The foregoing is by way of example only, and not limiting. It is intended that all equivalent modifications or variations without departing from the spirit and scope of the present invention shall be included in the appended claims.

Claims (15)

1. A micro light emitting diode display device, comprising:
the display panel comprises a plurality of pixel group units arranged side by side along a first direction, wherein each pixel group unit is provided with a plurality of pixels in an extending mode in a second direction, and the first direction is different from the second direction; and
the driving circuit is electrically connected with the display panel and outputs a first voltage and a second voltage to be transmitted to the plurality of pixels of each pixel group unit of the display panel;
the display panel has a first side and a second side opposite to each other in the second direction, the first voltage is introduced to the display panel from the first side, the second voltage is introduced to the display panel from the second side, and a voltage difference between the first voltage and the second voltage is positively correlated to the brightness of one of the connected pixels.
2. The micro-led display device of claim 1, wherein the first voltage is greater than the second voltage.
3. The micro-led display device according to claim 1, wherein the first voltage is a driving voltage of the plurality of pixel group units, and the second voltage is a common voltage of the plurality of pixel group units.
4. The micro-led display device of claim 1, wherein the first voltage is transmitted to the plurality of pixels of each of the pixel group units along the second direction.
5. The micro-led display device of claim 1, wherein the second voltage is transmitted to the plurality of pixels of each of the pixel group units in a direction opposite to the second direction.
6. The micro led display device of claim 1, wherein the display panel further comprises a plurality of first connection lines extending along the second direction, and the first voltage is transmitted to the plurality of pixel group units through the plurality of first connection lines.
7. The micro-led display device according to claim 6, wherein the first connection lines are disposed corresponding to the pixel group units.
8. The micro-led display device of claim 1, wherein the display panel further comprises a plurality of second connection lines extending in the second direction, and the second voltage is transmitted to the plurality of pixel group units through the plurality of second connection lines in a direction opposite to the second direction.
9. The micro-led display device according to claim 8, wherein the second connection lines are disposed corresponding to the pixel group units.
10. The micro-led display device of claim 8, further comprising:
at least one wire through which the second voltage is conducted from the second side of the display panel to the display panel.
11. A micro-led display device according to claim 10, wherein the at least one wire is connected to the plurality of second connection lines.
12. The micro led display device of claim 10, wherein the number of the conductive lines is plural, the pixel group units are divided into a plurality of regions in the first direction, and the conductive lines are disposed corresponding to the regions.
13. The micro-led display device according to claim 10, wherein the number of the wires is plural, and the plurality of wires are disposed corresponding to the plurality of second connection lines.
14. The micro-led display device of claim 1, further comprising:
the driving circuit comprises a data driving circuit, and the data driving circuit outputs a data signal to be transmitted to the pixel group units through the data lines.
15. The micro-led display device of claim 1, further comprising:
a plurality of scan lines; and
and the scanning driving circuit is electrically connected with the display panel and outputs scanning signals to be transmitted to the pixel group units through the plurality of scanning lines.
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