CN113516943A

CN113516943A - Control device and method of LED array and LED display screen

Info

Publication number: CN113516943A
Application number: CN202110928201.8A
Authority: CN
Inventors: 苗娇娇; 杨伟生; 陈育新; 冯俊杰; 高岩
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2021-10-19

Abstract

The invention discloses a control device and a control method of an LED array and an LED display screen, wherein the LED array comprises m x n LED lamp beads and m +1 buses, two ends of each lamp bead are respectively connected to different buses, and m is more than or equal to n; the control device further includes: the controller, m +1 bus are connected respectively on the controller, and the controller output high level, low level or high resistance state to the operating condition of control LED lamp pearl, in order to show the character of waiting to show. According to the LED array control device and method and the LED display screen, the two ends of each LED lamp bead of the m x n LED array are respectively connected to the m +1 different buses, so that the number of IO interfaces is saved, and the driving cost of the LED array is greatly reduced.

Description

Control device and method of LED array and LED display screen

Technical Field

The invention belongs to the technical field of LED display, and particularly relates to a control device and method of an LED array and an LED display screen.

Background

An LED is a kind of semiconductor diode, which is called a light emitting diode for short, and can convert electrical energy into light energy. The light emitting diode is composed of a P pole and an N pole which are combined together, and has one-way conductivity, when forward voltage is applied to the light emitting diode, holes injected into an N area from a P area and electrons injected into the P area from the N area are respectively recombined with the electrons in the N area and the holes in the P area within a few micrometers near a PN junction, and spontaneous emission fluorescence is generated. Electrons and holes in different semiconductor materials are in different energy states. The more energy is released, the shorter the wavelength of light is emitted. Diodes emitting red, green or yellow light are commonly used.

LEDs have been applied to all aspects of life, and become one of the most commonly used electronic components in life. In general, the LED driving method is to drive the anode or cathode of the LED by using an open-drain MOS transistor, and control the condition 1 according to a signal. However, this driving method has the following disadvantages: the utilization rate of the IO port is insufficient.

Disclosure of Invention

In order to solve the technical problems mentioned in the background art, the invention provides a control device and method of an LED array and an LED display screen, which aim to solve the technical problem that the utilization rate of an IO port is insufficient when the existing LED array is driven in a row and column driving mode.

In order to achieve the above purpose, the specific technical scheme of the control device and method for the LED array and the LED display screen of the invention is as follows:

the control device of the LED array comprises m × n LED lamp beads and m +1 buses, wherein two ends of each lamp bead are respectively connected to different buses, and m is more than or equal to n; the control device further includes:

the controller, m +1 bus are connected respectively on the controller, and the controller output high level, low level or high resistance state to the operating condition of control LED lamp pearl, in order to show the character of waiting to show.

Furthermore, the input end of the ith LED lamp bead in the LED array is connected with the ith bus, and the output end of the ith LED lamp bead is connected with the (i + 1) th bus.

Furthermore, in the ith row in the LED array, the input ends of the LED lamp beads from the 1 st column to the (i-1) th column are respectively connected with the 1 st bus to the (i-1) th bus, and the output ends are connected with the (i + 1) th bus.

Furthermore, in the ith row in the LED array, the input ends of the LED lamp beads from the (i + 1) th column to the nth column are respectively connected with the (i + 1) th bus to the (n + 1) th bus, and the output ends are connected with the ith bus.

Furthermore, the controller comprises a main control chip, an IO interface of the main control chip is respectively connected with a tri-state driving circuit for outputting a high level, a low level or a high resistance state, each bus is respectively connected with an output end of the tri-state driving circuit, and the tri-state driving circuit comprises a P-type metal oxide semiconductor effect transistor and an N-type metal oxide semiconductor effect transistor which are connected in series.

Furthermore, the controller also comprises a memory and a shift latch, wherein the input end of the memory receives a signal of the information to be displayed, the output end of the memory is connected with the input end of the shift latch, the output end of the shift latch is connected with the main control chip, and the memory sends the signal of the information to be displayed to the main control chip through the shift latch.

Further, the controller further comprises a counter, an address controller and a master-slave controller, the counter is used for receiving external synchronous clock signals and then respectively outputting the signals to the address controller, the master-slave controller, the read-write controller and the synchronous controller, the output end of the master-slave controller is respectively connected with the input ends of the address controller and the read-write controller, the output end of the synchronous controller is respectively connected with the input ends of the read-write controller and the shift latch, and the memory is respectively used for receiving address signals output by the address controller and read-write signals output by the read-write controller.

The device further comprises a brightness detection module, wherein the brightness detection module is used for acquiring the brightness of each character segment in the character to be displayed;

the controller is used for allocating two LED lamp beads of which the same ends are connected in parallel on the same bus to serve as target LED lamp beads for displaying that the brightness of the character segments in the characters to be displayed is smaller than a preset brightness threshold value when the brightness of the character segments in the acquired characters to be displayed is smaller than the preset brightness threshold value, and controlling the target LED lamp beads to be turned on in a time sequence mode.

A method of controlling an LED array, comprising the steps of:

acquiring the brightness of each character segment of a time sequence lightening character to be displayed in real time;

judging whether the brightness of each character segment in the character to be displayed is smaller than a preset brightness threshold value or not;

if a character segment with the brightness smaller than a preset brightness threshold value exists in the character to be displayed, two LED lamp beads with the same ends connected in parallel on the same bus are redistributed to serve as target LED lamp beads for displaying the character segment with the brightness smaller than the preset brightness threshold value in the character to be displayed, and the target LED lamp beads are controlled to be lightened in a time sequence.

An LED display screen comprises an LED array and a control device of the LED array.

The control device and method of the LED array and the LED display screen have the following advantages that: according to the control device and method for the LED array and the LED display screen, provided by the invention, the two ends of each LED lamp bead of the m x n LED array are respectively connected to the different m +1 buses, so that the number of IO interfaces is saved, the driving cost of the LED array is greatly reduced, when the brightness of a certain character section displayed by an LED is lower, the two LED lamp beads can be simultaneously lightened to display the character section with lower brightness, and the brightness of the LED array when the character is displayed is improved.

Drawings

Fig. 1 is a display driving circuit of a first embodiment of an LED array according to an embodiment of the present invention;

FIG. 2 is a display driving circuit of a second embodiment of an LED array according to the present invention;

FIG. 3 is a circuit diagram of a tri-state driver circuit of the present invention;

FIG. 4 is a timing diagram of a scan driving a second embodiment of an LED array according to the present invention;

fig. 5 is a control flowchart of a method for controlling an LED array according to an embodiment of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The conventional LED array mostly adopts a row-column driving scheme of a common cathode and a common anode to display characters, generally, when the LED array displays the characters, the characters are divided into a plurality of character sections, and LED lamp beads corresponding to the character sections are controlled to be lightened in a time sequence scanning driving mode to realize character display.

In view of this, the LED lamp beads are connected to different buses by adopting an LED series-parallel connection mode, so that the number of the buses is reduced, the number of IO interfaces is reduced, and the driving cost of the LED array is reduced. As shown in fig. 1, in the technical solution of this embodiment, an LED array includes m × n LED lamp beads and m +1 buses, where two ends of each lamp bead are respectively connected to different buses, where m is greater than or equal to n, and m and n are integers; the control device further includes:

Specifically, the value of m is at least 2, the control device of the LED array can be suitable for 5 × 5 LED arrays or 6 × 7 LED arrays, and the number and the arrangement mode of the LED lamp beads can be determined according to actual conditions.

According to the control device of the LED array, the controller outputs three different states to control the different states of the LED array, so that the LED array is effectively controlled.

In this embodiment, the input end of the ith LED lamp bead in the LED array is connected with the ith bus, and the output end of the ith LED lamp bead is connected with the (i + 1) th bus.

Furthermore, in the ith row in the LED array, the input ends of the LED lamp beads from the 1 st column to the i-1 st column are respectively connected with the 1 st bus to the i-1 st bus, and the output ends are all connected with the (i + 1) th bus; in the ith row in the LED array, the input ends of the LED lamp beads from the (i + 1) th column to the nth column are respectively connected with the (i + 1) th bus to the (n + 1) th bus, and the output ends are connected with the ith bus.

As shown in fig. 1, the following description will take an LED array of 4 × 4 as an example:

the input terminal of the LED0 in row 1 and column 1 is connected to the bus L0, the output terminal is connected to the bus L1, the input terminal of the LED5 in row 2 and column 2 is connected to the bus L1, and the output terminal is connected to the bus L2; the input terminal of the row 3, column 3 LED10 is connected to bus L2, and the output terminal is connected to bus L3; the row 4, column 4 LED15 has its input connected to bus L3 and its output connected to bus L4.

In the LED lamp beads in the first row, the i +1 columns of lamp beads comprise three, namely, the three are respectively an LED 1-an LED3, the output ends of the LEDs 1-the LED3 are connected to a bus L0, and the input ends of the LEDs are respectively connected to a bus L1-a bus L3.

In the LED lamp beads in the second row, the lamp beads in the i-1 column comprise one LED4, the input end of the LED4 is connected to the bus L0, and the output end of the LED4 is connected to the bus L2; the i + 1-column lamp beads comprise two lamps which are respectively an LED6 and an LED7, the output ends of the LED6 and the LED7 are connected to a bus L1, and the input ends of the LED6 and the LED7 are connected to a bus L2 and a bus L3 respectively.

In the third row of LED lamp beads, the i-1 column of lamp beads comprises two, namely an LED8 and an LED9, the output ends of the LED8 and the LED9 are connected to a bus L3, and the input ends of the LED8 and the LED9 are connected to a bus L0 and a bus L1 respectively; the i +1 lamp beads include 1, are LED11, and the input of LED11 is connected on bus L3, and the output of LED11 is connected on bus L2.

In the fourth row of LED lamp beads, the i-1 columns of lamp beads comprise three, namely, LEDs 12-LEDs 14, the output ends of the LEDs 12-LEDs 14 are connected to a bus L4, and the input ends of the LEDs are connected to a bus L0-a bus L2.

As shown in fig. 1, the LED array according to the embodiment of the present invention needs 5 IO interfaces, and outputs different levels through the IO interfaces, so that the light emitting diodes are respectively turned on. The buses L0, L1, L2, L3, and L4 are used as a sequence of numbers, and a corresponding number is zero to represent a low output level, a corresponding number is a high output level, and a corresponding letter Z represents a high impedance output state. For example, the bus L0 outputs a high level, the bus L1 outputs a low level, and the buses L2-L4 output a high impedance state, the corresponding sequence is [10zzz ], and at this time, the led0 is lit; the control relationship of the IO port to the LED array is as follows:

the [10zzz ] corresponds to the LED0 lamp bead being on; the [01zzz ] corresponds to the LED1 lamp bead and is bright; [0z1zz ] corresponding to the LED2 is on; [0zz1z ] corresponding to the LED3 lamp beads are on; the [1z0zz ] corresponds to the LED4 and is on; [ z10zz ] corresponding to the LED5 is on; the [ z01zz ] corresponds to the LED6 and is on; [ z0z1z ] corresponding to the LED7 is on; the [1zz0z ] corresponds to the LED8 and is on; [ z1z0z ] corresponding to the LED9 is on; [ zz10z ] is corresponding to the LED 10; [ zz01z ] is corresponding to the LED 11; [1zzz0] corresponding to the LED12 lamp beads are on; [ z1zz0] corresponding to the LED13 is on; [ zz1z0] is corresponding to the LED14 lamp beads and is bright; [ zzz10] corresponds to LED15 lamp bead bright.

In this embodiment, the controller includes a main control chip, an IO interface of the main control chip is connected to the tri-state driving circuit, respectively, and is configured to output a high level, a low level, or a high resistance state, each bus is connected to an output terminal of the tri-state driving circuit, the tri-state driving circuit includes a P-type metal oxide semiconductor effect transistor and an N-type metal oxide semiconductor effect transistor connected in series, and different states of the LED port are controlled by different states of the P-type metal oxide semiconductor effect transistor and the N-type metal oxide semiconductor effect transistor, so as to achieve a purpose of controlling the driving circuit. The main control chip can be a single chip microcomputer, and outputs high level, low level or high resistance state in a time sequence mode, so that the LED array is controlled.

Specifically, the controller further comprises a memory and a shift latch, wherein the input end of the memory receives a signal of the information to be displayed, the output end of the memory is connected with the input end of the shift latch, the output end of the shift latch is connected with the main control chip, and the memory sends the signal of the information to be displayed to the main control chip through the shift latch.

Further, the device also comprises a brightness detection module used for obtaining the brightness of each character segment in the character to be displayed;

As shown in fig. 2, the output terminals of the LED1 and the LED2 are connected in parallel to the bus L0, and the output [011zz ] of the main control chip can be simultaneously lighted to display the same character segment; the output ends of the LED4 and the LED5 are connected in parallel on the bus L2, and the output [110zz ] of the main control chip can be lightened simultaneously to display the same character segment; the output ends of the LED6 and the LED7 are connected in parallel on a bus L1, and the output [ z011z ] of the main control chip can be simultaneously lightened to display the same character segment; the output ends of the LED8 and the LED9 are connected in parallel on a bus L3, and the output [11z0z ] of the main control chip can be simultaneously lightened to display the same character segment; the output ends of the LED12 and the LED13 are connected in parallel on a bus L4, and the output [11zz0] of the main control chip can be simultaneously lightened to display the same character segment; the output terminals of the LED14 and the LED15 are connected in parallel to the bus L4, and the output of the main control chip zz110 can be simultaneously lighted to display the same character segment.

In fig. 4, Seg0-Seg2 correspond to the output signals of buses L0-L2, and at this time, it is displayed that [10Z ] corresponds to the lighting of LED0, and then [011] corresponds to the lighting of LED1 and LED 2.

As shown in fig. 5, an embodiment of the present invention further provides a method for controlling an LED array, including the following steps:

According to the control method of the LED array, when the fact that the brightness of a certain character segment is smaller than the preset brightness threshold value is detected, two LED lamp beads of which the same ends are connected in parallel on the same bus are selected to be simultaneously lightened, and therefore the brightness of the character segment is improved.

The invention also provides an LED display screen which comprises an LED array and the control device of the LED array.

Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The control device of the LED array is characterized in that the LED array comprises m × n LED lamp beads and m +1 buses, two ends of each lamp bead are respectively connected to different buses, wherein m is larger than or equal to n; the control device further includes:

2. The control device of the LED array according to claim 1, wherein an input terminal of an i x i-th LED bead in the LED array is connected to an i-th bus, and an output terminal of the i x i-th LED bead is connected to an i + 1-th bus.

3. The control device of the LED array according to claim 2, wherein in the ith row of the LED array, the input ends of the LED lamp beads from the 1 st column to the (i-1) th column are respectively connected with the 1 st bus to the (i-1) th bus, and the output ends are respectively connected with the (i + 1) th bus.

4. The control device of the LED array according to claim 3, wherein in the ith row of the LED array, the input ends of the LED lamp beads from the (i + 1) th column to the nth column are respectively connected with the (i + 1) th bus to the (n + 1) th bus, and the output ends are all connected with the ith bus.

5. The apparatus of claim 1, wherein the controller comprises a main control chip, the IO interface of the main control chip is connected to the tri-state driving circuit for outputting high level, low level or high resistance, each bus is connected to the output of the tri-state driving circuit, and the tri-state driving circuit comprises a P-type mosfet and an N-type mosfet connected in series.

6. The LED array control device of claim 5, wherein the controller further comprises a memory and a shift latch, an input end of the memory receives a signal of the information to be displayed, an output end of the memory is connected with an input end of the shift latch, an output end of the shift latch is connected with the main control chip, and the memory sends the signal of the information to be displayed to the main control chip through the shift latch.

7. The apparatus of claim 6, wherein the controller further comprises a counter, an address controller, and a master-slave controller, the counter is configured to receive an external synchronous clock signal and output the signal to the address controller, the master-slave controller, the read-write controller, and the synchronous controller, the output terminal of the master-slave controller is connected to the input terminals of the address controller and the read-write controller, the output terminal of the synchronous controller is connected to the input terminals of the read-write controller and the shift latch, and the memory is configured to receive the address signal output by the address controller and the read-write signal output by the read-write controller.

8. The apparatus of claim 7, further comprising a brightness detection module, wherein the brightness detection module is configured to obtain brightness of each character segment in the character to be displayed;

9. A control method of the control device of the LED array according to claim 8, comprising the steps of:

if a character segment with the brightness smaller than a preset brightness threshold value exists in the character to be displayed, two LED lamp beads with the same ends connected in parallel on the same bus are redistributed to serve as target LED lamp beads of the character segment, and the target LED lamp beads are controlled to be lightened in time sequence.

10. LED display screen, characterized in that it comprises an LED array and a control device for the LED array according to any of claims 1-8.