CN114625265A - LED display screen - Google Patents

Abstract

The embodiment of the invention discloses an LED display screen, which comprises: a plurality of LED lamp beads arranged in an array; each LED lamp bead comprises a first capacitor polar plate, a second capacitor polar plate and a first LED light-emitting structure; the first capacitor plate is electrically connected with a first electrode of the first LED light-emitting structure, the second capacitor plate is electrically connected with a second electrode of the first LED light-emitting structure, and at least partial areas of the first capacitor plate and the second capacitor plate are arranged oppositely; the LED display screen further comprises a touch detection module, and the touch detection module is used for collecting currents on two sides of the first capacitor plate and the second capacitor plate and determining a touch position according to the currents. The embodiment of the invention provides a touch screen implementation mode with high precision and simple structure.

Description

LED display

technical field

Embodiments of the present invention relate to display technology, and in particular, to an LED display screen.

Background technique

Small spacing and large size LED display (hereinafter referred to as LED display) has the advantages of light, thin and easy to install, wide application, fast production speed and long service life. With the increasing number of projects, LED displays are used on site, and LED displays are required not only to display functions, but also to have interactive touch functions.

At present, the conventional touch screen method of LED display screen is to add an infrared frame to the periphery of the LED display screen to realize the touch function. The problems of this method are: 1. The display screen needs to add infrared touch components, and the equipment cost is high; 2. Due to the infrared touch components It is a two-dimensional plane, so it cannot be applied to a curved screen; 3. The precision is low, and when multi-touch, the infrared rays may be blocked, resulting in some points not being recognized; 4. It is easily interfered by strong electromagnetic objects, such as transformers, etc. Interference; 5. It is susceptible to strong infrared interference, such as remote control, high temperature objects, incandescent lamps, sunlight and other interference. Therefore, it is an urgent problem to be solved in the industry to provide a touch screen implementation manner with high precision and simple structure.

SUMMARY OF THE INVENTION

The present invention provides an LED display screen, so as to provide an implementation manner of a touch screen with high precision and simple structure.

An embodiment of the present invention provides an LED display screen, including:

LED lamp beads and touch detection modules arranged in multiple arrays;

Each LED lamp bead includes a first capacitor plate, a second capacitor plate and a first LED light-emitting structure; the first capacitor plate is electrically connected to the first electrode of the first LED light-emitting structure, and the second The capacitor electrode plate is electrically connected to the second electrode of the first LED light-emitting structure, and the first capacitor electrode plate and the second capacitor electrode plate are arranged at least partially facing each other;

The touch detection module is electrically connected to the plurality of LED lamp beads arranged in an array, and the touch detection module is used to collect the currents on both sides of the first capacitor plate and the second capacitor plate, and according to the The current determines the touch location.

Optionally, the LED display also includes:

The touch driving module is electrically connected with the LED lamp beads, and is used for inputting high-frequency driving pulses to the first capacitor electrode plate and the second capacitor electrode plate.

Optionally, the LED display also includes:

a display driving module, electrically connected to the LED lamp beads, for inputting display driving pulses to the first capacitor plate and the second capacitor plate, so that the first LED light-emitting structure emits light;

The touch driving module is used for inputting high frequency driving pulses to the first capacitive electrode plate and the second capacitive electrode plate between two adjacent display driving pulses.

Optionally, the frequency of the high-frequency driving pulse input by the touch driving module is greater than or equal to the frequency of the display driving pulse input by the display driving module.

Optionally, the frequency of the high-frequency driving pulse input by the touch driving module is greater than or equal to 10 MHz.

Optionally, the LED display also includes:

The display driving module is multiplexed into the touch driving module.

Optionally, the touch detection module includes a current acquisition unit, a comparison unit and a touch position determination unit;

The current collection unit is electrically connected to the LED lamp beads, and is used for collecting currents on both sides of the first capacitor electrode plate and the second capacitor electrode plate;

The comparison unit is electrically connected to the current acquisition unit and the touch position determination unit, and is configured to compare the current with a preset current threshold, and send the comparison result to the touch position determination unit;

The touch position determination unit is configured to determine the touched LED lamp bead according to the comparison result, and determine the area where the touched LED lamp bead is located as the touch position.

Optionally, the LED display also includes:

a control module, electrically connected to the display driving module, for sending a control signal to the display driving module according to the image signal;

The display driving module is configured to generate a driving signal according to the control signal, and drive the LED lamp beads according to the driving signal, wherein the driving signal includes a display driving pulse and a high-frequency driving pulse.

Optionally, the control module is multiplexed into the touch position determination unit.

Optionally, the LED lamp bead further includes a second LED light-emitting structure and a third LED light-emitting structure;

The second electrode of the second LED light-emitting structure is electrically connected to the second electrode of the first LED light-emitting structure;

The second electrode of the third LED light emitting structure is electrically connected to the second electrode of the first LED light emitting structure.

The LED display screen of the embodiment of the present invention includes a plurality of LED lamp beads, and the LED lamp beads include a first capacitor electrode plate and a second capacitor electrode plate, and the first capacitor electrode plate and the second capacitor electrode plate are respectively connected to the first LED light emitting structure. At least part of the first capacitor plate and the second capacitor plate are disposed facing each other to form an inductive capacitor, and the touch position can be determined by detecting the current change at both ends of the first LED light-emitting structure. In the embodiment of the present invention, only two pole plates are added to the LED lamp beads to realize the detection of the touch position, the structure is simple, the display screen does not need to be changed greatly, and the cost is reduced. Moreover, each LED lamp bead is a pixel point of the LED display screen, and the touch detection of the solution in this embodiment is based on a pixel point, which greatly improves the touch detection accuracy. In addition, the size of the solution in this embodiment is flexible. Since the LED display screen is an assembled screen, this solution does not require an infrared frame, so it can be assembled arbitrarily without being limited by the size of the outer frame. And it supports multi-touch, because the touch point is on the screen body, it will not be unable to touch because the infrared rays are blocked. Since this solution is capacitive sensing, it does not need to directly touch the electrodes, and the capacitance value can also be changed. Therefore, the display screen can be protected by adding outer glass or outer layer glue to protect the LED display without affecting the touch function. Moreover, the algorithm for determining the touch position is simple, and the position of the touch can be known through current feedback, and it is not necessary to calculate the position of the touch point through a complex algorithm, thereby reducing the difficulty of the algorithm.

Description of drawings

1 is a schematic diagram of an LED display screen provided in this embodiment;

FIG. 2 is a schematic diagram of an LED lamp bead provided in this embodiment;

FIG. 3 is a schematic diagram of another LED display screen provided by this embodiment;

4 is a schematic diagram of a module of an LED display screen provided in this embodiment;

5 is a schematic diagram of a module of another LED display screen provided by this embodiment;

6 is a schematic diagram of a module of another LED display screen provided by this embodiment;

FIG. 7 is a schematic diagram of another LED lamp bead provided by this embodiment.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

This embodiment provides an LED display screen. FIG. 1 is a schematic diagram of an LED display screen provided by this embodiment, and FIG. 2 is a schematic diagram of an LED lamp bead provided by this embodiment. Referring to FIG. 1 and FIG. 2 , LED displays include:

A plurality of LED lamp beads 1 and a touch detection module 2 arranged in an array; each LED lamp bead 1 includes a first capacitor plate 10 , a second capacitor plate 20 and a first LED light-emitting structure 30 ; the first capacitor plate 10 It is electrically connected to the first electrode of the first LED light-emitting structure 30, the second capacitor plate 20 is electrically connected to the second electrode of the first LED light-emitting structure 30, and the first capacitor plate 10 and the second capacitor plate 20 are at least partially face setting;

The touch detection module 2 is electrically connected to a plurality of LED lamp beads 1 arranged in an array. The touch detection module 2 is used to collect currents on both sides of the first capacitive electrode plate 10 and the second capacitive electrode plate 20 and determine the touch position according to the current.

The LED lamp beads 1 are arranged in an array, that is, a plurality of LED lamp beads 1 are arranged in the form of an n*m array, wherein both n and m are positive integers greater than or equal to 2. The first capacitor electrode plate 10 and the second capacitor electrode plate 20 are conductive electrode plates. The first LED light-emitting structure 30 may be an LED light-emitting structure of any color, and the first LED light-emitting structure 30 may include a first electrode, a second electrode, and a light-emitting layer disposed between the first electrode and the second electrode. The light-emitting structure applies an electrical signal of a set size, and the first LED light-emitting structure 30 emits light of a set color. The first capacitor electrode plate 10 and the second capacitor electrode plate 20 are disposed in at least part of the area facing each other, and the part facing each other constitutes an inductive capacitor. Exemplarily, the first capacitor electrode plate 20 and the second substrate 20 may be disposed completely in front of each other, and the first capacitor electrode plate 10 and the second capacitor electrode plate 20 form an inductive capacitor.

Specifically, when the finger touches the set position of the display screen, the medium between the first capacitor plate 10 and the second capacitor plate 20 changes due to the proximity of the lamp bead at this position, and the capacitance value of the sensing capacitor changes. will change. Since the capacitance value of the sensing capacitor itself is very small, and the change of the capacitance value is relatively small, the brightness of the first LED light emitting structure 30 will not be affected. Whether the LED lamp bead 1 is touched can be determined by detecting the change of the capacitance value on both sides of each lamp bead, and the area where the touched LED lamp bead 1 is located can be determined as the touch position. Exemplarily, it can be determined whether the LED lamp bead 1 is touched by detecting the current change on both sides of the first LED light emitting structure 30 of each LED lamp bead 1, thereby determining the touch position.

The LED display screen of this embodiment can detect the touch position only by adding two pole plates to the LED lamp bead, and the structure is simple, no major changes to the display screen are required, and the cost is reduced. Moreover, each LED lamp bead is a pixel point of the LED display screen, and the touch detection of the solution in this embodiment is based on a pixel point, which greatly improves the touch detection accuracy. In addition, the size of the solution in this embodiment is flexible. Since the LED display screen is an assembled screen, this solution does not require an infrared frame, so it can be assembled arbitrarily without being limited by the size of the outer frame. And it supports multi-touch, because the touch point is on the screen body, it will not be unable to touch because the infrared rays are blocked. Since this solution is capacitive sensing, it does not need to directly touch the electrodes, and the capacitance value can also be changed. Therefore, the display screen can be protected by adding outer glass or outer layer glue to protect the LED display without affecting the touch function. Moreover, the algorithm for determining the touch position is simple, and the position of the touch can be known through current feedback, and it is not necessary to calculate the position of the touch point through a complex algorithm, thereby reducing the difficulty of the algorithm.

Specifically, because the capacitor is sensitive to high-frequency signals, the LED display is also driven by pulses. The LED display is generally equipped with a display driving module. The display driving module inputs display driving pulses to the LED lamp beads, and the display driving pulse can be used as the induction capacitor The touch driving signal directly detects the currents on both sides of the first capacitor plate and the second capacitor plate in the display stage. A separate touch driving module may also be used to input touch driving signals to the first capacitive pad and the second capacitive pad.

FIG. 3 is a schematic diagram of another LED display screen provided by this embodiment. Optionally, referring to FIG. 3 , the LED display screen further includes:

The touch driving module 3 is electrically connected with the LED lamp beads, and is used for inputting high-frequency driving pulses to the first capacitor electrode plate and the second capacitor electrode plate.

Specifically, the frequency of the high-frequency driving pulse input by the touch driving module 3 may be different from the frequency of the display driving signal input by the display driving module, and the frequency of the high-frequency driving pulse may be set according to the needs of the inductive capacitance to ensure high sensitivity of touch detection.

FIG. 4 is a schematic diagram of a module of an LED display screen provided in this embodiment. Optionally, referring to FIG. 4 , the LED display screen further includes:

The display driving module 4 is electrically connected with the LED lamp beads, and is used for inputting display driving pulses to the first capacitor plate 10 and the second capacitor plate 20, so that the first LED light-emitting structure 30 emits light;

The touch driving module 3 is used for inputting high-frequency driving pulses to the first capacitive electrode plate 10 and the second capacitive electrode plate 20 between two adjacent display driving pulses.

Specifically, there is a certain time interval between two adjacent display driving pulses. Ensure that capacitive sensing will not affect the screen display.

Optionally, the frequency of the high-frequency driving pulse input by the touch driving module 3 is greater than or equal to the frequency of the display driving pulse input by the display driving module 4 .

Specifically, since the capacitance is relatively sensitive to high-frequency signals, by setting the frequency of the high-frequency driving pulses to be greater than or equal to the frequency of the display driving pulses, when the finger touches the display screen, the capacitance value of the inductive capacitance changes more, ensuring that the touch detection has a higher performance. high sensitivity.

Optionally, the frequency of the high-frequency driving pulse input by the touch driving module 3 is greater than or equal to 10 MHz, so that when a finger touches the display screen, the capacitance value of the inductive capacitor changes more, ensuring high sensitivity of touch detection.

Optionally, the display driving module 4 is multiplexed into the touch driving module 3 . That is, the display driving module 4 has the function of the touch driving module 3, and the display driving module 4 can input display driving pulses to the LED lamp beads, and can also input high-frequency driving pulses to the LED lamp beads.

Specifically, the display driving module 4 can input high-frequency driving pulses to the first capacitive electrode plate 10 and the second capacitive electrode plate 20 at the time interval between two adjacent display driving pulses, and there is no need to separately set the touch driving module 3, The cost is reduced, and the display screen is guaranteed to have a smaller volume.

FIG. 5 is a schematic block diagram of another LED display screen provided in this embodiment. Optionally, referring to FIG. 5 , the touch detection module 2 includes a current acquisition unit 21 , a comparison unit 22 and a touch position determination unit 23 ;

The current collection unit 21 is electrically connected to the LED lamp beads, and is used for collecting currents on both sides of the first capacitor electrode plate 10 and the second capacitor electrode plate 20;

The comparison unit 22 is electrically connected with the current acquisition unit 21 and the touch position determination unit 23, and is used for comparing the current with a preset current threshold, and sending the comparison result to the touch position determination unit 23;

The touch position determination unit 23 is configured to determine the touched LED lamp bead according to the comparison result, and determine the area where the touched LED lamp bead is located as the touch position.

Specifically, when a finger or other object touches the display screen, during the touch sensing time period, due to the change in the capacitance value of the sensing capacitor caused by the touch, the currents on both sides of the first capacitive pad 10 and the second capacitive pad 20 will change. becomes smaller, the comparison unit 22 compares the current at both ends of each of the first capacitor plate 10 and the second capacitor plate 20 with a preset current threshold, and when the current is less than the preset current threshold, determines that the LED lamp bead is touched , and determine the area where multiple touched LED lamp beads are located as the touch position. The preset current threshold can be determined according to the currents on both sides of the first capacitive substrate 10 and the second capacitive electrode plate 20 when no finger or object touches the display screen.

In addition, when a finger or other object touches the display screen, during the touch sensing time period, the current on both sides of the first capacitive electrode plate 10 and the second capacitive electrode plate 20 in the LED lamp bead at the touch position will be smaller than that at the untouched position The comparison unit 22 can also compare the currents of the respective LED lamp beads, and determine the touch position according to the comparison results.

FIG. 6 is a schematic diagram of a module of another LED display screen provided in this embodiment. Optionally, referring to FIG. 6 , the LED display screen further includes:

The control module 5 is electrically connected to the display driving module 4, and is used for sending a control signal to the display driving module 4 according to the image signal;

The display driving module 4 is used for generating a driving signal according to the control signal, and driving the LED lamp beads according to the driving signal, wherein the driving signal includes a display driving pulse and a high-frequency driving pulse.

Optionally, referring to FIG. 6 , the control module 5 is multiplexed as a touch position determination unit. That is, the control module 5 not only has the function of sending a control signal to the display driving module 4 according to the image signal, but also has the function of a touch position determination unit. The comparison unit 22 sends the comparison result to the control module 5, and the control module 5 determines the touched LED lamp bead according to the comparison result, and determines the area where the touched LED lamp bead is located as the touch position. By arranging the control module 5 to be multiplexed as a touch position determination unit, there is no need to additionally set a touch position determination unit, which reduces the cost and ensures that the display screen has a small volume.

FIG. 7 is a schematic diagram of another LED lamp bead provided in this embodiment. Optionally, referring to FIG. 7 , the LED lamp bead further includes:

the second LED light emitting structure 60 and the third LED light emitting structure 70;

The second electrode of the second LED light-emitting structure 60 is electrically connected to the second electrode of the first LED light-emitting structure 30;

The second electrode of the third LED light emitting structure 70 is electrically connected to the second electrode of the first LED light emitting structure 30 .

The second LED light-emitting structure 60 and the third LED light-emitting structure 70 both include a first electrode, a second electrode, and a light-emitting layer disposed between the first electrode and the second electrode. The second LED light-emitting structure 60 , the third LED light-emitting structure 70 and the first LED light-emitting structure 30 may have the same light-emitting color to form LED lamp beads of the same color. The second LED light-emitting structure 60 , the third LED light-emitting structure 70 and the first LED light-emitting structure emit light. The light-emitting colors of the structures 30 can also be different to form colored LED lamp beads. The second electrode of the second LED light emitting structure 60 and the second electrode of the third LED light emitting structure 70 are both electrically connected to the second electrode of the first LED light emitting structure 30 , and the first electrode of the second LED light emitting structure 60 and the third LED The first electrode of the light-emitting structure 70 and the first electrode of the first LED light-emitting structure 30 are respectively used for inputting a driving signal corresponding to each light-emitting structure to drive the corresponding light-emitting structure to emit light.

Optionally, the first LED light-emitting structure 30 , the second LED light-emitting structure 60 and the third LED light-emitting structure 70 have different light-emitting colors.

Exemplarily, the first LED light emitting structure 30 , the second LED light emitting structure 60 and the third LED light emitting structure 70 may be one of a red light emitting structure, a green light emitting structure and a blue light emitting structure, respectively.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

1. An LED display screen, comprising:

the LED lamp beads are arranged in a plurality of arrays, and the touch detection module is arranged in the arrays;

each LED lamp bead comprises a first capacitor polar plate, a second capacitor polar plate and a first LED light-emitting structure; the first capacitor plate is electrically connected with a first electrode of the first LED light-emitting structure, the second capacitor plate is electrically connected with a second electrode of the first LED light-emitting structure, and at least partial areas of the first capacitor plate and the second capacitor plate are arranged oppositely;

the touch detection module is electrically connected with the LED lamp beads arranged in the plurality of arrays and used for collecting currents on two sides of the first capacitor plate and the second capacitor plate and determining a touch position according to the currents.

2. The LED display screen of claim 1, further comprising:

and the touch driving module is electrically connected with the LED lamp bead and is used for inputting high-frequency driving pulses to the first capacitor plate and the second capacitor plate.

3. The LED display screen of claim 2, further comprising:

the display driving module is electrically connected with the LED lamp beads and used for inputting display driving pulses to the first capacitor plate and the second capacitor plate to enable the first LED light-emitting structure to emit light;

the touch driving module is used for inputting high-frequency driving pulses to the first capacitor plate and the second capacitor plate between two adjacent display driving pulses.

4. The LED display screen of claim 3, wherein:

the frequency of the high-frequency driving pulse input by the touch driving module is greater than or equal to the frequency of the display driving pulse input by the display driving module.

5. The LED display screen of claim 4, wherein:

the frequency of the high-frequency driving pulse input by the touch driving module is greater than or equal to 10 MHz.

6. The LED display screen of claim 3, wherein:

and the display driving module is multiplexed as the touch driving module.

7. The LED display screen of claim 1 or 6, wherein:

the touch detection module comprises a current acquisition unit, a comparison unit and a touch position determination unit;

the current collecting unit is electrically connected with the LED lamp beads and is used for collecting currents on two sides of the first capacitor plate and the second capacitor plate;

the comparison unit is electrically connected with the current acquisition unit and the touch position determination unit and is used for comparing the current with a preset current threshold value and sending a comparison result to the touch position determination unit;

the touch position determining unit is used for determining the touched LED lamp beads according to the comparison result and determining the area where the touched LED lamp beads are located as the touch position.

8. The LED display screen of claim 7, further comprising:

the control module is electrically connected with the display driving module and used for sending a control signal to the display driving module according to an image signal;

the display driving module is used for generating a driving signal according to the control signal and driving the LED lamp bead according to the driving signal, wherein the driving signal comprises a display driving pulse and a high-frequency driving pulse.

9. The LED display screen of claim 8, wherein:

the control module is multiplexed as the touch position determination unit.

10. The LED display screen of claim 1, wherein:

the LED lamp bead further comprises a second LED light-emitting structure and a third LED light-emitting structure;

the second electrode of the second LED light-emitting structure is electrically connected with the second electrode of the first LED light-emitting structure;

the second electrode of the third LED light-emitting structure is electrically connected with the second electrode of the first LED light-emitting structure.

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