CN112509476B - Micro light emitting diode display device - Google Patents

Micro light emitting diode display device Download PDF

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Publication number
CN112509476B
CN112509476B CN202011373084.5A CN202011373084A CN112509476B CN 112509476 B CN112509476 B CN 112509476B CN 202011373084 A CN202011373084 A CN 202011373084A CN 112509476 B CN112509476 B CN 112509476B
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voltage
display panel
pixel group
display device
micro
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CN112509476A (en
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刘应苍
廖冠咏
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PlayNitride Inc
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PlayNitride Inc
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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 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 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. Briefly, 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 fatal 'branding' problem of the OLED can be solved, and the Micro LED display technology 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 factories strive 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 in the industry to provide a micro light emitting diode display device, which can overcome the uneven brightness caused by the voltage drop of the driving voltage, and further improve the display quality.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a micro light emitting diode display device capable of improving the brightness unevenness 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 connection 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 connection 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 diagram illustrating 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 D1 1 ～P n (n is a positive integer greater than 1), each pixel group unit P 1 ～P n A plurality of pixels are extended in a second direction D2, and the first direction D1 is different from the second direction D2. In the present 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 also be not perpendicular to each other, for example, an included angle therebetween is an acute angle.
Specifically, the pixel group unit P of the present embodiment 1 ～P n Arranged 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 P 1 ～P n Each of the pixels includes a plurality of pixels arranged along a second direction D2 (here, a vertical direction), and each of the pixels has at least one micro light emitting diode. By pixel group unit P 1 For example, it includes pixels P arranged to extend along the second direction D2 11 ～P 1m (m is a positive integer greater than 1); then, the pixel group unit P n-2 For example, it includes pixels P arranged to extend along the second direction D2 (n-2)1 ～P (n-2)m And so on. Due to the pixel group unit P 1 ～P n Arranged side by side along a first direction D1, and each pixel group unit P 1 ～P n Each having m pixels extending along the second direction D2, the display panel 11 has n × m pixels P 11 ～P nm . The pixel P of the display panel 11 of the present embodiment 11 ～P nm The display panel is arranged in a matrix shape including rows (Column, second direction D2) and columns (Row, first direction D1). In addition, the display panel 11 further has a first side A1 and a second sideA2, 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 A2.
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 V DD And a second voltage V SS Each pixel group unit P respectively transmitted to the display panel 11 1 ～P n The plurality of pixels. Wherein the first voltage V DD The second voltage V is introduced into the display panel 11 from the first side A1 of the display panel 11 SS Is conducted from the second side A2 of the display panel 11 to the display panel 11, and a first voltage V is applied DD And a second voltage V SS Is positively correlated to the brightness of the connected one of the pixels. Here, the first voltage V DD And a second voltage V SS The voltage difference of (a) and the brightness of the connected pixel show a positive correlation, that is, the first voltage V DD And a second voltage V SS The larger the voltage difference, the larger the brightness of the pixel; conversely, the first voltage V DD And a second voltage V SS The brightness of the pixel is relatively small when the voltage difference is 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 V DD And a second voltage V SS Is provided by the power supply circuit 122. A first voltage V DD For driving the pixel group unit P 1 ～P n The pixels P 11 ～P nm The light emitting element (i.e., micro light emitting diode) emits light, and the second voltage V SS Is a pixel group unit P 1 ～P n The pixels P 11 ～P nm And a first voltage V DD And a second voltage V SS The display panel 11 is correspondingly led in from two opposite side edges (A1, A2) of the display panel 11. Herein, the first voltage V DD Greater than the second voltage V SS . In the present embodiment, the first voltage V DD E.g. 4.6V, second voltage V SS For example, -2V, but not limited thereto, in different embodiments, different first voltages V can be provided according to the characteristics of the driven micro-leds DD And a second voltage V SS 。
The first voltage V output by the power supply circuit 122 of the present embodiment DD The first side A1 of the display panel 11 is led into the display panel 11 through a conducting wire C1, and then a plurality of first connecting wires (see C in FIG. 2) are arranged in the display area q 、C q+1 ) To the pixel group unit P 1 ～P n The pixels P 11 ～P nm And (6) electrically connecting. Herein, the first voltage V DD Sequentially transmitted to each pixel group unit P along the second direction D2 through each first connection line in the plane 1 ～P n The plurality of pixels. In addition, the second voltage V output by the power supply circuit 122 of the present embodiment SS The 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 of FIG. 2) q 、E q+1 ) The conducting wires C2 are respectively connected with the second connecting wires, and the second voltage V SS Is transmitted to each pixel group unit P in the direction opposite to the second direction D2 through the conductive line C2 and the second connection lines in the plane 1 ～P n The pixels of (a).
In addition, the micro led display device 1 of the present embodiment further includes a plurality of data lines D 1 ～D n The data driving circuit 121 passes through the data lines D 1 ～D n Is electrically connected to the display panel 11. Thus, the data driving circuit 121 can pass through the data lines D 1 ～D n Respectively outputting a data signal to the pixel group units P of the display panel 11 along the second direction D2 1 ～P n The pixels P 11 ～P nm . In addition, the micro led display device 1 may further include a plurality of scan lines S 1 ～S m The scan driving circuit 13 is disposed adjacent to the third side A3 of the display panel 11, and the scan driving circuit13 passing through the scan lines S 1 ～S m Is electrically connected to the display panel 11. Therefore, the scan driving circuit 13 can pass through the scan lines S 1 ～S m Outputting a scanning signal to the pixel group unit P along the first direction D1 1 ～P n The pixels P 11 ～P nm . In various embodiments, the scan driving circuit 13 may be disposed adjacent to the fourth side A4 and pass through the scan lines S 1 ～S m Is 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 correspondingly 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 S 1 ～S m Respectively turn on the pixels P 11 ～P nm In this case, the data driving circuit 121 may correspond to each row of the pixel group units P 1 ～P n The data signal passes through the data lines D 1 ～D n To each pixel group unit P 1 ～P n The power supply circuit 122 can supply the first voltage V to the pixels DD And a second voltage V SS Is transmitted from the first side A1 and the second side A2 of the display panel 11 to each pixel group unit P via the in-plane first connecting line and the in-plane second connecting line via the corresponding wires C1 and C2 1 ～P n To drive or light the pixel group unit P 1 ～P n The pixels P 11 ～P nm The micro light emitting diode can further make the display device display images.
Referring to FIG. 2, two phases of the micro LED display device 1 of the above embodiment are described in detailFour consecutive pixels P of the adjacent pixel group unit qr 、P q(r+1) 、P (q+1)r 、P (q+1)(r+1) The detailed circuit of (1). In FIG. 2, q can be between 1 and n-1 (1. Ltoreq. Q.ltoreq.n-1), r can be between 1 and m-1 (1. Ltoreq. R.ltoreq.m-1) qr 、P q(r+1) And a pixel P (q+1)r 、P (q+1)(r+1) Respectively arranged along a second direction D2, pixels P qr 、P (q+1)r And a pixel P q(r+1) 、P (q+1)(r+1) Respectively arranged along the first direction D1. Here, the pixel P qr 、P q(r+1) 、P (q+1)r 、P (q+1)(r+1) For example, a 2T1C circuit architecture is taken as an example, but not limited thereto, and in different embodiments, the pixel may have other circuit architectures, such as 3T1C, 6T1C, or 7T1C.
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 D2 q 、C q+1 ) First voltage V DD Through the first connecting lines (e.g. C) q 、C q+1 ) To the pixel group units P 1 ～P n The pixels P 11 ～P nm . Therefore, the conductive wires C1 in FIG. 1 are respectively connected with the first connecting wires C of FIG. 2 q 、C q+1 Is connected to apply a first voltage V DD And 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 of the second connection lines E) extending along the second direction D2 q 、E q+1 ) Second voltage V SS Through the second connecting lines (e.g. E) q 、E q+1 ) Is transmitted to the pixel group units P along the direction opposite to the second direction D2 1 ～P n The pixels P 11 ～P nm . Therefore, the conductive wires C2 in fig. 1 are respectively connected with the second connection wires E of fig. 2 q 、E q+1 Is connected to apply a second voltage V SS And transmitting the data to the pixels of the corresponding pixel group unit. Here, the second connecting lines and the pixel group unitsThe same is set correspondingly (one-to-one correspondence).
It should be noted that the "conductive line", "first connection line", or "second connection 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 thereto.
By pixel P qr For 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 C q Is connected to a first voltage V DD A drain connected to one end of the micro-LED 21, and the other end of the micro-LED 21 connected to a second connection line E q Is connected to a second voltage V SS . In addition, the gate of the switching transistor 23 and a scanning line S r A drain connected to receive the scan signal and a data line D q Connected to receive data signals, and having a 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 C q And (4) connecting. Thereby, the switching transistor 23 can be driven by the scanning line S r Is turned on by the scanning signal to make the data signal pass through the data line D q The gate of the driving transistor 22 is inputted via the switching transistor 23 to turn on the driving transistor 22 to make the first voltage V DD Can pass through the first connecting line C q And 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 formed qr Is turned on to emit light, and the first voltage V DD And a second voltage V SS Is positively related to the connected pixel P qr The 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 is SS ) 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 lines DD Similarly, 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) DD And a second voltage V SS ) Is formed by the same side of the display panel (as the first side A1, the first voltage V shown in FIG. 3) DD And a second voltage V SS Is located at the first side A1) leading into the display panel. In the large-sized display panel, since the length of the connection lines corresponding to the pixels of each pixel group unit along the second direction D2 is quite long, when the first voltage V is applied DD When the display panel is introduced, the pixels of each pixel group unit generate voltage drop due to the internal impedance of the connecting lines 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 the pixel is from the signal input end a, the smaller the voltage difference between the two ends of the micro light emitting diode is, which causes the uneven brightness of the pixels in each pixel group unit in the vertical direction (the second direction D2), 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 12 DD The 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 11 SS Is 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 diagram of a driving voltage drop of each pixel in a pixel group unit of the micro LED display device of FIG. 1, and FIG. 5 is a schematic diagram of a prior art and a prior art according to the present inventionThe driving voltage difference of the pixels at different positions in one pixel group unit is shown.
In FIG. 4, vp represents the first voltage V DD Is a positive voltage (here, for example, 4.6V), which passes through the first connection line C q The display panel 11 is conveyed from the first side A1 to the second side A2; vcom represents the second voltage V SS Is a negative voltage (here, for example, -2V), which passes through the second connection line E q The second side A2 is conveyed 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 voltage differences across the micro-leds 21 of the corresponding pixels; r represents a first connecting line C of a segment q Or a second connecting line E q The 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 of x =1, the first connection line C of the driving transistor 22 is connected q A second connection line E for connecting the micro-LEDs 21 and having a voltage equal to Vp-mIR q The voltage on the side is equal to Vcom +1/2 x m (m + 1) x IR, and the voltage difference is equal to Vp-mIR-Vcom-1/2 x m (m + 1) x IR; and in the pixel of x = m, the first connection line C of the drive transistor 22 is connected q A second connection line E with voltage equal to Vp-1/2 xm (m + 1) xIR for connecting the micro-LED 21 q The voltage on the side is equal to Vcom + mIR, and the voltage difference is still equal to Vp-mIR-Vcom-1/2 x m (m + 1) x IR; in other pixels at different positions, the first connecting line C q Lateral voltage and second connection line E q The voltage difference on the side is not much different from the two positions (x =1 and x = m).
In a practical embodiment, the first voltage V provided by the power supply circuit 122 DD E.g. 4.6V, second voltage V SS For example, -2v, m for example 100, ir for example 0.0001V, the first connecting line C of the first pixel (x = 1) of the display panel 11 in one of the pixel group units extending in the second direction D2 q Side and second connecting line E q The first connection line C of the pixel at the position where the voltage difference (DeltaV) on the side is 6.085V,1/4 (i.e., the 25 th pixel) q Side and second connecting line E q The voltage difference (Δ V) at the side is 5.905V; the first connection line C of the pixel at the 1/2 position (i.e., the 50 th pixel) q Lateral voltage and second connection E q The voltage difference (Δ V) on the side is 5.84V, and the first connection line C of the last pixel (x = m) q Side and second connecting line E q The voltage difference (Δ V) between the two sides is 6.085V, which proves that the technique of the present invention can indeed make the driving transistor 22 and the micro-led 21 both sides (i.e. the first connecting line C) q Side and second connecting line E q Side), the difference of the voltages is not smaller due to the difference farther from the signal input terminal A, and the first voltage V of the pixel at different positions is not smaller DD And a second voltage V SS The difference in voltage of (c) is not large.
As shown in FIG. 5, Δ V is a first connecting line C q Side and second connecting line E q The voltage difference of the sides. In the conventional method, the voltages (the first voltage and the second voltage) for driving the micro leds are introduced into the display panel from the same side of the display panel, so that the pixels at the positions farther from the signal input end a will generate voltage drops due to the internal impedance of the common electrode layer itself of the common voltage and the connecting line of the driving voltage, so that the voltage difference Δ V between the driving transistor 22 and the micro leds 21 will be smaller and smaller, resulting in uneven brightness. However, in the micro light emitting diode display device 1 of the present embodiment, the first voltage V outputted from the power supply circuit 122 is applied DD The 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 11 SS A first voltage V is introduced into the display panel 11 from the second side A2 of the display panel 11 DD And a second voltage V SS Is positively related to the brightness of the connected pixels, in each pixel group unit P 1 ～P n Along the secondIn the pixels at different positions in the direction D2, the driving transistor 22 and the micro light emitting diode 21 are disposed on both sides (i.e., the first connecting line C) q Side and second connecting line E q Side) 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 pixel group units P in the prior art 1 ～P n The 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 from being too complicated, fig. 6 does not show all the components (for example, the pixel group unit and the pixel 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 122 SS The 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 to the pixel group units through the second connecting wires in the display area. In addition, the pixel group units of the display panel 11 of the present 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 wire C21 SS A second voltage V transmitted by the wire C22 via the pixel group unit in the region Z1 via the corresponding second connecting wire SS The second voltage V transmitted by the wire C23 is transmitted to the pixel group unit of the area Z2 through the corresponding second connecting wire in the plane SS Pixel group sheet transferred to the area Z3 through the in-plane corresponding second connection lineA meta. Therefore, although the pixel group units of the display panel 11 still have 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. With such a design, the pixels in the three regions Z1, Z2, and Z3 are less likely to have uneven brightness in the first direction D1. Of course, in different embodiments, the second connection lines in the corresponding planes of 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 transmitted SS The 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 connected in a one-to-one correspondence (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 be included within the spirit and scope of the present invention, which is defined in the appended claims.

Claims (14)

1. A micro light emitting diode display device, comprising:
the display device comprises a display panel, a first light source and a second light source, wherein the display panel comprises a plurality of pixel group units which are 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; 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 related to the brightness of one of the connected pixels;
wherein the first voltage is a driving voltage of the pixel, and the second voltage is a common voltage of the pixel;
in each pixel group unit, the voltage difference of the pixels adjacent to the first side or the second side is greater than that of the pixels in the middle area.
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 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.
4. 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.
5. 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.
6. The micro-led display device according to claim 5, wherein the first connection lines are disposed corresponding to the pixel group units.
7. 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.
8. The micro-led display device of claim 7, wherein the second connection lines are disposed corresponding to the pixel group units.
9. The micro-led display device of claim 7, 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.
10. The micro-led display device of claim 9, wherein the at least one wire is connected to the plurality of second connection lines.
11. The micro led display device of claim 9, 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.
12. The micro-led display device of claim 9, wherein the number of the conductive lines is a plurality of conductive lines, and the plurality of conductive lines are disposed corresponding to the plurality of second connection lines.
13. 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.
14. The micro light emitting diode 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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