CN111326105A

CN111326105A - LED display device capable of reducing wiring and driving mode thereof

Info

Publication number: CN111326105A
Application number: CN202010365520.8A
Authority: CN
Inventors: 杨秋强; 沈奕; 郑清交; 吕岳敏
Original assignee: Shantou Goworld Display Plant Ii Co ltd; Shantou Goworld Display Co Ltd; Shantou Goworld Display Technology Co Ltd
Current assignee: Shantou Goworld Display Plant Ii Co ltd; Shantou Goworld Display Co Ltd; Shantou Goworld Display Technology Co Ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2020-06-23

Abstract

The invention relates to an LED display device capable of reducing wiring and a driving mode thereof, and the LED display device comprises a driving board, wherein the driving board is provided with a driving circuit, the driving circuit comprises a plurality of row driving wires and a plurality of column driving wires, each column driving wire and each row driving wire are intersected with each other to form a plurality of intersections, each intersection is provided with a first welding position and a second welding position, the first welding position comprises a first welding pad and a second welding pad, the first welding pad is connected out by the row driving wire of the corresponding intersection, the second welding pad is connected out by the column driving wire positioned at one side of the corresponding intersection, and an N pole and a P pole of a first LED are respectively welded with the first welding pad and the second welding pad; the second welding position comprises a third welding pad and a fourth welding pad, the third welding pad is connected out by a row driving wire of a corresponding intersection, the fourth welding pad is connected out by a column driving wire at the other side of the corresponding intersection, and a P pole and an N pole of the second LED are respectively welded with the third welding pad and the fourth welding pad; the LED display device is driven in a frame-by-frame mode, and the doubling of LED pixel rows can be realized under the condition of not increasing row driving lines.

Description

LED display device capable of reducing wiring and driving mode thereof

Technical Field

The invention relates to the technical field of display, in particular to an LED display device with reduced wiring and a driving mode thereof.

Background

The LED display device generally includes a driving board and an LED (light emitting diode) as a light emitting pixel, the driving board is generally provided with a plurality of row driving lines and a plurality of column driving lines which intersect with each other, the LED is disposed at an intersection of the row driving lines and the column driving lines (one intersection is generally provided with one LED), and two pins, an N pole and a P pole, of the LED are respectively connected with the row driving lines and the column driving lines at the intersection. However, as the display resolution is increased, more and more row driving lines are required for such a display device, and especially when such a display device is designed as a color display, the number of LEDs is increased by at least 3 times, and more row driving lines are required, which causes difficulty in designing a driving board.

Disclosure of Invention

The invention aims to solve the technical problem of providing an LED display device with reduced wiring and a driving method thereof, which can realize doubling of LED pixel rows without increasing row driving wires, improve display resolution and reduce wiring, thereby reducing the design difficulty of a driving board. The technical scheme is as follows:

the utility model provides a reduce LED display device who walks line, includes the drive plate, and the drive plate is equipped with drive circuit, and drive circuit includes many row drive wires and many row drive wires, and each row drive wire intercrossing constitute a plurality of crosspoints that the array was arranged, its characterized in that: each intersection is provided with a first welding position and a second welding position, and a first LED and a second LED are welded on the first welding position and the second welding position respectively; the first welding position comprises a first welding pad and a second welding pad, the first welding pad is connected out by a row driving wire of a corresponding intersection point, the second welding pad is connected out by a column driving wire at one side of the corresponding intersection point, and an N pole and a P pole of the first LED are respectively welded with the first welding pad and the second welding pad; the second welding position comprises a third welding pad and a fourth welding pad, the third welding pad is connected out by a row driving wire of a corresponding intersection, the fourth welding pad is connected out by a column driving wire at the other side of the corresponding intersection, and a P pole and an N pole of the second LED are respectively welded with the third welding pad and the fourth welding pad.

In the LED display device, the driving board may be a PCB, or may be a circuit board made of other materials, such as a glass board provided with a thin film circuit or a polyimide film provided with a thin film circuit; the number of row drive lines is typically 8, 16, 32, 64, the number of column drive lines is not limited; the first LED and the second LED are arranged on the driving board in a soldering tin mode and are electrically connected with circuits of the driving board, and the first LED and the second LED are used as light emitting pixels of the LED display device.

The invention also provides a driving mode of the LED display device, which is characterized in that: the LED display device is driven in a frame-by-frame mode, and each frame is divided into a first half frame and a second half frame; the first half frame comprises a plurality of first time intervals tau 1, different first time intervals tau 1 correspond to different row driving lines, in each first time interval tau 1, a first voltage V1 is applied to the corresponding row driving line, other row driving lines are in a floating state, a second voltage V2 is applied to the column driving line, and the definition of delta V1= V2-V1 is that delta V1 is more than or equal to 0; the second half frame comprises a plurality of second time intervals τ 2, different second time intervals τ 2 correspond to different row driving lines, within each second time interval τ 2, the corresponding row driving line is applied with a third voltage V3, other row driving lines are in a floating state, and the column driving line is applied with a fourth voltage V4, defining Δ V2= V4-V3, and Δ V2 is less than or equal to 0.

Generally, the first period (or the second period) corresponds to each row driving line in sequence so as to perform progressive scanning on the driving plates, and the first period and the second period may be interleaved with each other (at this time, the first field and the second field are cut), or the first period constitutes a continuous first field first and the second period constitutes a continuous second field second. The frequency F of the frame is generally greater than or equal to 60Hz, the lengths of the first period τ 1 and the second period τ 2 are generally 1/2FM, and M is the number of row driving lines. Any row drive line with either V1 or V3 applied should be kept floating.

According to the LED display device and the driving method thereof, the characteristics of forward conduction (light emitting) and reverse non-conduction of the LED are utilized, two LEDs with opposite directions are arranged at a cross point, a first LED is driven in a first time interval tau 1 corresponding to a row driving line and a second LED is driven in a second time interval tau 2 corresponding to the row driving line by inputting positive and negative voltages, one driving line can simultaneously drive two pixel rows, so that doubling of the LED pixel rows can be realized under the condition that the row driving line is not increased, the display resolution can be improved, the wiring is reduced, and the design difficulty of the driving board is reduced.

In order to reduce the crosstalk between the column driving lines, it is preferable that the first LED and the second LED have a uniform threshold voltage Vth; and within any one of the first period τ 1 or the second period τ 2, the polarity difference of V2 or V4 applied to different column driving lines is less than 2 Vth. The range of V2 or V4 applied to different column drive lines is Max (V2) -Min (V2), or Max (V4) -Min (V4).

Generally, a threshold voltage difference between LEDs of less than 0.2V can be considered a uniform threshold voltage; alternatively, although there is a slight difference in threshold voltage between the individual LEDs of the same structure, the same material, or the same emission color, they are considered to have a uniform threshold voltage.

More preferably, within either the first period τ 1 or the second period τ 2, Δ V1 ≧ Vth-0.4 (V), Δ V2 ≦ - (Vth-0.4 (V)). This may be done in order to reduce voltage differences between different column drive lines.

More preferably, the first LED and the second LED are LEDs having the same emission color. This ensures that the first LED has a uniform threshold voltage with respect to the second LED.

In a more preferred embodiment, the first LED and the second LED are blue LEDs. The first LED and the second LED may be provided with a color conversion layer, such as a quantum dot coating, to realize colorization.

In a preferred embodiment, the first LED or the second LED corresponding to each row driving line is defined as a pixel row, and for any pixel row, the corresponding first LED or second LED has a uniform threshold voltage Vth, and within any first period τ 1 or second period τ 2, the difference between the polarities of V2 or V4 applied to different column driving lines is less than 2Vth of the first LED or second LED of the pixel row corresponding to τ 1 or τ 2.

In order to reduce the voltage range difference between different column driving lines, the LEDs of the same pixel row are LEDs with the same luminous color. This reduces voltage differences between different column drive lines.

Alternatively, the LEDs in the same pixel row may be blue LEDs or green LEDs, and may also be red LEDs or yellow LEDs. To uniform the threshold, the voltage difference between the data lines is reduced, the threshold voltage of the blue or green LED is typically 3.2V-3.6V; the threshold voltage of a red LED or a yellow LED is generally around 2V.

In a more preferable scheme, the pixel rows may be divided into a first pixel row and a second pixel row which are sequentially and alternately arranged, the first pixel row includes blue LEDs and green LEDs which are sequentially and alternately arranged, and the second pixel row includes red LEDs and yellow LEDs which are sequentially and alternately arranged. Therefore, the LEDs with four colors can be uniformly arranged, so that the LED display device can display an ultra-wide color gamut range, and the voltage range difference between different column driving wires can be kept small.

The LED display device and the driving method thereof utilize the characteristics of forward conduction (light emitting) and reverse non-conduction of the LED, two LEDs with opposite directions are arranged at a cross point, a first LED is driven in a first time interval tau 1 corresponding to a row driving line and a second LED is driven in a second time interval tau 2 corresponding to the row driving line by inputting positive and negative voltages, and one driving line can simultaneously drive two pixel rows, so that the doubling of the LED pixel rows can be realized under the condition of not increasing the row driving line, the display resolution can be improved, the wiring can be reduced, and the design difficulty of the driving board can be reduced.

Drawings

Fig. 1 is a schematic structural view of an LED display device according to a preferred embodiment of the present invention.

Fig. 2 is a partially enlarged view of fig. 1.

Fig. 3 is a driving circuit diagram of the LED display device shown in fig. 1.

Detailed Description

As shown in fig. 1 and fig. 2, the LED display device with reduced routing lines includes a driving board, the driving board is provided with a driving circuit 1, the driving circuit 1 includes a plurality of row driving lines 11 and a plurality of column driving lines 12, each column driving line 12 and each row driving line 11 intersect with each other to form a plurality of intersections arranged in an array, each intersection is provided with a first welding position 13 and a second welding position 14, and the first welding position 13 and the second welding position 14 are respectively welded with a first LED15 and a second LED 16; the first welding position 13 comprises a first welding pad 131 and a second welding pad 132, the first welding pad 131 is connected by the row driving line 11 of the corresponding intersection, the second welding pad 132 is connected by the column driving line 12 at one side of the corresponding intersection, and the N pole and the P pole of the first LED are respectively welded with the first welding pad 131 and the second welding pad 132; the second bonding site 14 includes a third bonding pad 141 and a fourth bonding pad 142, the third bonding pad 141 is connected by the row driving line 11 of the corresponding intersection, the fourth bonding pad 142 is connected by the column driving line 12 at the other side of the corresponding intersection, and the P pole and the N pole of the second LED are respectively bonded to the third bonding pad 141 and the fourth bonding pad 142.

The driving method of the LED display device comprises the following steps: the LED display device is driven in a frame-by-frame mode, and each frame is divided into a first half frame and a second half frame; the first half frame comprises a plurality of first time intervals τ 1, different first time intervals τ 1 correspond to different row driving lines 11, within each first time interval τ 1, a first voltage V1 is applied to the corresponding row driving line 11, other row driving lines 11 are in a floating state, a second voltage V2 is applied to the column driving line 12, Δ V1= V2-V1, and Δ V1 is greater than or equal to 0; the second half frame includes a plurality of second time periods τ 2, different second time periods τ 2 correspond to different row driving lines 11, within each second time period τ 2, the corresponding row driving line 11 is applied with the third voltage V3, other row driving lines 11 are in a floating state, and the column driving line 12 is applied with the fourth voltage V4, defining Δ V2= V4-V3, and Δ V2 is less than or equal to 0.

The frequency F of the frame is generally greater than or equal to 60Hz, the lengths of the first period τ 1 and the second period τ 2 are generally 1/2FM, and M is the number of row driving lines. Any row drive line with either V1 or V3 applied should be kept floating.

In the present embodiment, the first LED or the second LED corresponding to each row driving line 11 is defined as a pixel row, and for any pixel row, the corresponding first LED or second LED has a uniform threshold voltage Vth; and within any one of the first period τ 1 or the second period τ 2, the polarity difference of V2 or V4 applied on the different column driving lines 12 is less than 2 Vth; within either the first period τ 1 or the second period τ 2, there is Δ V1 ≧ Vth-0.4 (V), Δ V2 ≦ - (Vth-0.4 (V)).

Referring to fig. 3, in the present embodiment, the pixel rows may be divided into a first pixel row 117 and a second pixel row 118 which are sequentially alternated, and the first pixel row 117 includes a blue LED and a green LED (threshold voltage V) which are sequentially alternated_th1About 3.4V), the second pixel row 118 includes sequentially alternating red and yellow LEDs (threshold voltage V)_th2About 2V). This allows the LEDs of the four colors to be uniformly arranged, so that the LED display device can display an ultra-wide color gamut range, and the voltage range between different column driving lines 12 can be kept small.

In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and the equivalent or simple change of the structure, the characteristics and the principle described in the present patent idea is included in the protection scope of the present patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a reduce LED display device who walks line, includes the drive plate, and the drive plate is equipped with drive circuit, and drive circuit includes many row drive wires and many row drive wires, and each row drive wire intercrossing constitute a plurality of crosspoints that the array was arranged, its characterized in that: each intersection is provided with a first welding position and a second welding position, and a first LED and a second LED are welded on the first welding position and the second welding position respectively; the first welding position comprises a first welding pad and a second welding pad, the first welding pad is connected out by a row driving wire of a corresponding intersection point, the second welding pad is connected out by a column driving wire at one side of the corresponding intersection point, and an N pole and a P pole of the first LED are respectively welded with the first welding pad and the second welding pad; the second welding position comprises a third welding pad and a fourth welding pad, the third welding pad is connected out by a row driving wire of a corresponding intersection, the fourth welding pad is connected out by a column driving wire at the other side of the corresponding intersection, and a P pole and an N pole of the second LED are respectively welded with the third welding pad and the fourth welding pad.

2. The utility model provides a reduce LED display device's of walking line drive mode which characterized in that: the LED display device is driven in a frame-by-frame mode, and each frame is divided into a first half frame and a second half frame; the first half frame comprises a plurality of first time intervals tau 1, different first time intervals tau 1 correspond to different row driving lines, in each first time interval tau 1, a first voltage V1 is applied to the corresponding row driving line, other row driving lines are in a floating state, a second voltage V2 is applied to the column driving line, and the definition of delta V1= V2-V1 is that delta V1 is more than or equal to 0; the second half frame comprises a plurality of second time intervals τ 2, different second time intervals τ 2 correspond to different row driving lines, within each second time interval τ 2, the corresponding row driving line is applied with a third voltage V3, other row driving lines are in a floating state, and the column driving line is applied with a fourth voltage V4, defining Δ V2= V4-V3, and Δ V2 is less than or equal to 0.

3. The driving method of the LED display device with reduced routing of claim 2, wherein: the first LED and the second LED have a uniform threshold voltage Vth; and within any one of the first period τ 1 or the second period τ 2, the polarity difference of V2 or V4 applied to different column driving lines is less than 2 Vth.

4. The driving method of the LED display device with reduced routing of claim 3, wherein: within either the first period τ 1 or the second period τ 2, Δ V1 ≧ Vth-0.4 (V), Δ V2 ≦ - (Vth-0.4 (V)).

5. The driving method of the LED display device with reduced routing of claim 3, wherein: the first LED and the second LED are LEDs with the same light emitting color.

6. The driving method of the LED display device with reduced routing of claim 5, wherein: the first LED and the second LED are blue LEDs.

7. The driving method of the LED display device with reduced routing of claim 2, wherein: the first LED or the second LED corresponding to each row driving line is defined as a pixel row, and for any pixel row, the corresponding first LED or second LED has a uniform threshold voltage Vth, and within any first period tau 1 or second period tau 2, the range of V2 or V4 applied to different column driving lines is less than 2Vth of the first LED or second LED of the pixel row corresponding to tau 1 or tau 2.

8. The driving method of the LED display device with reduced routing of claim 7, wherein: and the LEDs in the same pixel row are the LEDs with the same light emitting color.

9. The driving method of the LED display device with reduced routing of claim 7, wherein: the pixel rows may be divided into first pixel rows including blue LEDs and green LEDs alternately arranged in sequence and second pixel rows including red LEDs and yellow LEDs alternately arranged in sequence.