CN219418467U

CN219418467U - LED display screen control system and display device

Info

Publication number: CN219418467U
Application number: CN202321513355.1U
Authority: CN
Inventors: 于海洋; 胡龙山; 黄志正; 樊磊
Original assignee: Jichuang North Chengdu Technology Co ltd
Current assignee: Jichuang North Chengdu Technology Co ltd
Priority date: 2023-06-14
Filing date: 2023-06-14
Publication date: 2023-07-25
Anticipated expiration: 2033-06-14
Also published as: TWM650787U

Abstract

The application provides a LED display screen control system and display device, this control system includes: the scanning card and the LED drive chip coupled with the scanning card, wherein, integrate in the scanning card: the processor, the buffer, and the signal transmitter, the LED driving chip is integrated with: serial-parallel conversion module, digital module, drive module, and parallel-serial conversion module. The LED driving chip cascade control method can realize cascade connection of the LED driving chip on the basis of improving the integration level and the signal transmission rate of the driving module.

Description

LED display screen control system and display device

Technical Field

The application relates to the technical field of display, in particular to an LED display screen control system and a display device.

Background

A light-emitting diode (LED) is a diode that operates using the principle of recombination of minority carriers and majority carriers in a PN junction. Compared with a liquid crystal display device, the LED display device has low power consumption, high refreshing speed and wide viewing angle, and can be used in strong illumination environment and low-temperature environment. Accordingly, the LED display device is particularly suitable for use as an outdoor display screen for displaying text, images and video.

The LED display device mainly drives an LED lamp panel in an LED display screen through the driving module, but the existing driving module has the defects of large module size, low integration level, easy interference of signal transmission during serial-parallel conversion and the like.

Accordingly, there is a need to provide an improved solution to overcome the above technical problems in the prior art.

Disclosure of Invention

In order to solve the technical problems, the application provides an LED display screen control system and a display device, which can solve the problems of low signal transmission rate and easy interference of transmission and are convenient for realizing chip cascading.

According to a first aspect of the present application, there is provided an LED display screen control system, comprising: a scanning card and an LED driving chip coupled with the scanning card,

the scanning card is integrated with:

the processor is used for carrying out data processing on the received parameter data and the received image data and outputting a driving signal group and a display data group;

a buffer coupled to the processor, receiving the set of drive signals and the set of display data, and outputting a set of serial differential signals;

a signal transmitter coupled with the buffer for transmitting the serial differential signal group to the LED driving chip;

the LED driving chip is integrated with:

the serial-parallel conversion module is used for receiving the serial differential signal group and outputting a parallel driving signal group and a parallel display data group;

the digital module is coupled with the serial-parallel conversion module and is used for processing and encoding the received parallel driving signal group and the parallel display data group;

the driving module is coupled with the digital module and used for receiving the processed parallel driving signal group and the parallel display data group to drive the LED display screen to display images;

and the parallel-serial conversion module is coupled with the digital module, receives the coded parallel driving signal group and the parallel display data group, and outputs a serial differential signal group.

Optionally, the number of the LED driving chips in the LED display screen control system is at least two, and the at least two LED driving chips are arranged in cascade.

Optionally, the scan card is further integrated with:

and the mode switching module is used for outputting one of a first mode switching signal and a second mode switching signal according to a user instruction, wherein the first mode switching signal is used for controlling the scanning card to work in a TTL mode, and the second mode switching signal is used for controlling the scanning card to work in an LVDS mode.

Optionally, the signal transmitter is coupled to the mode switching module, receives one of the first mode switching signal and the second mode switching signal,

the first mode switching signal is used for controlling the signal transmitter to output a parallel driving signal group and a parallel display data group; the second mode switching signal is used for controlling the signal transmitter to output the serial differential signal group.

Optionally, the serial-to-parallel conversion module and the parallel-to-serial conversion module further receive an enable signal, where the enable signal is used to control the serial-to-parallel conversion module and the parallel-to-serial conversion module to be turned on and off so as to control the LED driving chip to switch between the LVDS mode and the TTL mode.

Optionally, the parallel driving signal group and the parallel display data group are TTL signal groups.

Optionally, the serial differential signal group is an LVDS signal group.

Optionally, the serial differential signal group is a mini-LVDS signal group.

According to a second aspect of the present application, there is provided a display device including:

a display screen; and

the LED display control system described in any one of the embodiments of the present application is configured to drive the display according to the parameter data and the image data.

Optionally, the display screen includes an LED display screen, an AMOLED display screen, a micro LED display screen, or a MiniLED display screen.

The beneficial effects of this application include at least:

in the control system, the signal transmitter and the processor are integrated into one scanning card, and the serial-parallel conversion module, the digital module, the parallel-serial conversion module and the driving module are integrated into one LED driving chip, so that the impedance and interference of signals in the transmission process can be reduced, the integration level is improved, the size of the driving module can be reduced, and the display effect of the LED display screen can be improved; in addition, because the serial-parallel conversion module and the parallel-serial conversion module are integrated in each LED driving chip at the same time, the LED driving chips can conveniently realize multi-chip cascading when transmitting the display data set and the driving signal set at high speed in a serial differential signal set format.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 shows a schematic diagram of an LED display control system;

FIG. 2 shows a schematic diagram of another LED display screen control system;

fig. 3 shows a schematic diagram of an LED display control system provided according to a first embodiment of the present application;

fig. 4 shows a schematic diagram of an LED display control system provided according to a second embodiment of the present application;

fig. 5 shows a schematic diagram of an LED display control system provided according to a third embodiment of the present application;

fig. 6 shows a schematic diagram of a display device provided according to an embodiment of the present application.

Reference numerals illustrate:

the LED display screen control system A (control system A) 100, a scan card A10, an LED driving chip A20, a processor A11, a buffer A12, a multi-pin interface A13, a multi-pin interface B21, a buffer B22, an LED driving circuit A23, a buffer C24, a multi-pin interface C25, a control system B200, a scan card B30, an LED driving chip B40, a processor B31, a buffer D32, a serial signal interface 33, a serial-parallel conversion module A41, a buffer E42, an LED driving circuit B43, a control system C300, a scan card C50, a processor C51, a buffer F52, a signal transmitter A53, a mode switching module 54, an LED driving chip C60, a serial-parallel conversion module B61, a digital module A62, a driving module A63, a parallel-serial conversion module B64, and a display screen 400.

Detailed Description

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the accompanying drawings. This application may, however, be embodied in different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

In the description of the present application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments. "and/or" herein is a description of an association relationship of an associated object, meaning that there may be three relationships, e.g., a and/or B, which may represent: a exists alone, A and B exist together, and B exists alone. "plurality" means two or more than two. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

Fig. 1 shows a schematic diagram of an LED display control system, as shown in fig. 1, the LED display control system a (also referred to herein simply as "control system a") 100 includes a scan card a 10 and an LED driving chip a 20, wherein the scan card a 10 is provided with a processor a 11, a buffer a 12 and a multi-pin interface a 13, and the LED driving chip a 20 is provided with a multi-pin interface B21, a buffer B22, an LED driving circuit a 23, a buffer C24 and a multi-pin interface C25. In the control system a 100, signals transmitted between the scan card a 10 and the LED driving chip a 20 and between the cascaded LED driving chips a 20 are single-ended TTL (Transistor-Transistor Logic) signals, and the transmission medium is a multi-core flat cable.

However, each single-ended signal occupies one wire core, so that the number of the wire cores of the flat cable is large, the contact points of connectors between the flat cable and the LED lamp panel module are also large, and the possibility of abnormal display caused by wire core failure or poor contact is increased; in addition, the signal attenuation transmission distance of the TTL signal is limited, so that the control system A100 is not suitable for occasions where long-distance signal transmission is required, and the display effect of the LED display screen is affected due to the low transmission rate of the TTL signal.

Fig. 2 shows a schematic diagram of another LED display control system, and the above problem is improved, as shown in fig. 2, the control system B200 includes a scan card B30 and an LED driving chip B40, where the scan card B30 is provided with a processor B31, a buffer D32, and a serial signal interface 33, and the LED driving chip B40 is provided with a serial-parallel conversion module a 41, a buffer E42, and an LED driving circuit B43. The serial signal interface 33 provided in the scan card B30 enables the scan card B30 to output the LVDS signal (Low Voltage Differential Signaling, low voltage differential signal) group, and the serial-parallel conversion module a 41 provided on the LED driving chip B40 enables the LED driving chip B40 to receive the LVDS signal group.

In the control system B200, a serial LVDS signal group can be adopted between the scan card B30 and the LED driving chip B40 for data transmission, for example, the 1 st LVDS signal group is transmitted between the scan card B30 and the 1 st LED driving chip B40, the N th LVDS signal group is transmitted between the scan card B30 and the N th LED driving chip B40, N is an integer greater than 1, so that the signals can be transmitted farther and the communication is more stable. However, in the control system B200, only the parallel connection of the plurality of LED driving chips B40 can be realized, but the cascade connection of the plurality of LED driving chips B40 cannot be realized, and the application scenario is limited.

In view of this problem, the control system B200 is further improved in this embodiment, as shown in fig. 3, and the control system C300 provided in this embodiment includes: a scan card C50 and an LED driving chip C60 coupled with the scan card C50. The scan card C50 and the LED driving chip C60 are coupled by a connection line, which supports, for example, both transmission of serial signals and transmission of parallel signals.

In the example shown in fig. 3, the scan card C50 has integrated therein: processor C51, buffer F52, and signal transmitter a 53.

The processor C51 receives the parameter data and the image data sent by the front-end module, and is configured to perform data processing on the received parameter data and image data, output a driving signal group and a display data group, and in the example shown in fig. 3, the processor C51 outputs the driving signal group and the display data group in a TTL signal format. Specifically, the parameter data received by the processor C51 includes, for example, information such as a type of LED driving chip (PWM type driving chip or general type driving chip), a size of a load display area, a total group count of output display data (e.g., RGB data), a scanning mode (e.g., 8-scan, 16-scan, 32-scan, etc.) of the LED lamp panel module, a pixel width and height of the LED lamp panel module, a scanning number, a scanning decoding mode, a driving mode, a data group count, and a routing mode; the image data received by the processor C51 includes, for example, field sync signal data and display data such as RGB data sets.

In some embodiments, the data processing by processor C51 includes: and carrying out at least one of the processes of intercepting, correcting, data rearrangement, gray extraction and the like on the image data according to the received parameter data to obtain the processed image data. The image data interception includes, for example, performing correction according to the size of the on-load display area in the parameter data, for example, performing inverse Gamma (Gamma) correction, brightness correction and/or other corrections such as chromaticity correction, the data rearrangement includes, for example, performing operations of rearranging gray data positions according to a data format required by a column driving chip (for example, a general driving chip or a PWM driving chip) on a rear-end LED driving chip and routing information on the LED display screen, performing splicing and combining, and the gray extraction includes, for example, performing a separation operation according to each bit on the gray data after the correction processing to convert the gray data into a manner of realizing different weights according to different bits. Further, the processor C51 further includes generating a driving signal group corresponding to the LED driving chip C60 according to the aforementioned processed image data, and generating a display data group required to satisfy the LED panel module, wherein the driving signal group includes, for example, a clock signal (CLK), a latch signal (LAT), an enable signal (OE), a row selection signal, etc., the display data group includes, for example, a plurality of RGB data groups, and the LED panel module includes, for example, a circuit board, the LED driving chip C60 disposed on the circuit board, and a plurality of LED beads as display pixels.

It should be understood that the processor C51 in this embodiment may be an integrated comprehensive device capable of implementing the above functions, or may be regarded as a collective term of a plurality of devices or circuit modules respectively implementing the above different functions and simultaneously integrated on the scan card C50, which is not strictly limited in this application.

The buffer F52 is coupled to the processor C51, receives the driving signal set and the display data set output by the processor C51, and the buffer F52 is configured to buffer the driving signal set and the display data set output by the processor C51, so as to complete data processing and data output operation in cooperation with the processor C51. In the example shown in fig. 3, the buffer F52 outputs the buffered data content in the serial differential signal group format, which is equivalent to performing the parallel-to-serial conversion on the driving signal group and the display data group once, but other embodiments are also possible, for example, the buffer F52 may output the buffered data content in the TTL signal group format in parallel, that is, output the driving signal group and the display data group in parallel.

In the example shown in fig. 3, the serial differential signal group is, for example, an LVDS signal group. In a further preferred embodiment, the serial differential signal group is, for example, a mini-LVDS signal group.

The signal transmitter a 53 is coupled to the buffer F52 for transmitting the serial differential signal set to (e.g., via a flex cable to) the LED driver chip C60. Here, the driving signal group and the display data group are transmitted to the LED driving chip C60 in the LVDS signal group, which is beneficial to reducing the number of the flat cable cores and improving the stability and reliability of transmission. It is understood that the signal transmitter a 53 may be any device capable of transmitting a serial differential signal when turned on or off.

In the example shown in fig. 3, the LED driving chip C60 has integrated therein: serial-to-parallel conversion module B61, digital module a 62, driving module a 63, and parallel-to-serial conversion module B64.

It can be appreciated that in a specific implementation, an LED display screen is composed of a plurality of LED lamp bead arrays, and the plurality of LED lamp beads can be uniformly driven by one LED driving chip C60, or can be jointly driven by a plurality of cascaded LED driving chips, so in the control system C300 of the embodiment of the present application, the number of LED driving chips C60 may be one, or may be at least two. When at least two LED driving chips C60 are present, the at least two LED driving chips C60 are disposed in cascade, and the internal structure of each LED driving chip C60 is the same.

The serial-parallel conversion module B61 receives the serial differential signal group, and is configured to perform serial-parallel conversion on the serial differential signal group from the scan card C50 or the upper LED driving chip C60 to obtain a parallel driving signal group and a parallel display data group, and output the parallel driving signal group and the parallel display data group to the lower module. In this way, signals and data can be transmitted at high speed in the format of serial differential signal groups between the scan card C50 and the LED driving chip C60, and accurate driving of the LED display screen can be realized in the data transmission format of parallel driving signal groups and parallel display data groups inside the LED driving chip C60.

In the embodiment of the present application, the parallel driving signal group and the parallel display data group are, for example, TTL signal groups.

The digital module a 62 is coupled to the serial-parallel conversion module B61 for processing and encoding the received parallel driving signal sets and parallel display data sets. The processed parallel driving signal group and the parallel display data group are signals and data for driving the LED lamp beads corresponding to the current-stage LED driving chip C60, the signals and the data are output to the driving module A63 for display of the current-stage chip, and the signals and the data which need to be transmitted to the next-stage LED driving chip when the encoded parallel driving signal group and the parallel display data group are cascaded by the multi-stage LED driving chip C60 are output to the parallel-serial conversion module B64 so as to be transmitted to the next-stage LED driving chip.

In some embodiments, the processing by digital module a 62 includes: the received data is accessed and the packet is displayed.

In some embodiments, the LED driving chips of different stages may read the encoded values to obtain display data, and the LED driving chips of different stages read the display data of the corresponding stages according to the different encoding. It can be understood that, in the control system C300 when the LED driving chips C60 are cascaded, the digital module a 62 encodes and processes the transmitted data, so that each driving module a 63 can accurately obtain the driving signals and the display data required for driving the corresponding LED lamp beads.

The driving module A63 is coupled with the digital module A62, and receives the processed parallel driving signal group and the parallel display data group to drive the LED display screen to display images.

In the embodiment of the present application, the driving module a 63 includes, for example, a column driving chip, but in other embodiments of the present application, the driving module a 63 may also include a row driving chip (also referred to as a row decoding chip).

The parallel-serial conversion module B64 is coupled to the digital module a 62, and receives the encoded parallel driving signal set and the parallel display data set, and performs parallel-serial conversion to output the serial differential signal set to the next stage LED driving chip.

It can be understood that, because the serial-parallel conversion module B61 and the parallel-serial conversion module B64 are simultaneously disposed in each LED driving chip C60, in the cascade application of a plurality of LED driving chips C60, the present application can also realize high-speed transmission of signals and data between different LED driving chips C60 in the format of serial differential signal groups, and the signal interference is small and the transmission quality is high.

Other examples will be listed below as illustration. It should be noted that the following embodiments follow the reference numerals and part of the content of the foregoing embodiments, wherein the same reference numerals are used to designate the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, reference is made to the foregoing embodiments, and the following embodiments are not repeated.

In a further preferred embodiment, as shown in fig. 4 and 5, the scan card C50 is also integrated with: the mode switching module 54 is configured to output one of a first mode switching signal and a second mode switching signal according to a user instruction, where the first mode switching signal is used to control the scan card C50 to operate in the TTL mode, and the second mode switching signal is used to control the scan card C50 to operate in the LVDS mode. In the example shown in fig. 5, in the TTL mode, the scan card C50 transmits the parallel driving signal group and the parallel display data group (i.e., the TTL signal group) in the TTL signal format to the LED driving chip C60; in the example shown in fig. 4, in the LVDS mode, the scan card C50 transmits a serial differential signal group in the LVDS signal format (i.e., an LVDS signal group) to the LED driving chip C60.

In particular embodiments, the mode switching module 54 is coupled to the signal transmitter a 53, and controls the signal transmitter a 53 to be in different working states by sending the first mode switching signal or the second mode switching signal to the signal transmitter a 53, so as to implement mode switching control on the scan card C50. In some examples, the signal transmitter a 53 is an interface conversion device and receives a serial differential signal group and is capable of outputting the serial differential signal group or outputting a parallel driving signal group and a parallel display data group according to a received control signal (e.g., a first mode switching signal or a second mode switching signal). For example, when the mode switching module 54 sends the first mode switching signal to the signal transmitter a 53, the first mode switching signal controls the signal transmitter a 53 to convert the serial LVDS signal group into a parallel TTL signal group and then transmit the parallel TTL signal group to the LED driving chip C60; when the mode switching module 54 transmits the second mode switching signal to the signal transmitter a 53, the second mode switching signal controls the signal transmitter a 53 to output the serial LVDS signal group to the LED driving chip C60.

It is understood that the first mode switching signal and the second mode switching signal may be signals represented by different levels output by the same signal port of the mode switching module 54, or may be signals represented by the same level output by different signal ports of the mode switching module 54, which is not strictly limited in the embodiment of the present application.

As shown in fig. 4 and 5, the serial-to-parallel conversion module B61 also receives an enable signal EN1, and the parallel-to-serial conversion module B64 also receives an enable signal EN2. The enable signals EN1 and EN2 are used to control the serial-to-parallel conversion module B61 and the parallel-to-serial conversion module B64 to switch the LED driving chip C60 between the LVDS mode and the TTL mode. In the embodiment shown in fig. 4, the enable signal EN1 controls the serial-to-parallel conversion module B61 to turn on the serial-to-parallel conversion function, the enable signal EN2 controls the parallel-to-serial conversion module B64 to turn on the parallel-to-serial conversion function, and the LED driving chip C60 operates in the LVDS mode, and at this time, the LED driving chip C60 receives and outputs a serial LVDS signal group; in the example shown in fig. 5, the enable signal EN1 controls the serial-to-parallel conversion module B61 to turn off the serial-to-parallel conversion function, the enable signal EN2 controls the parallel-to-serial conversion module B64 to turn off the parallel-to-serial conversion function, and the LED driving chip C60 operates in the TTL mode, and the LED driving chip C60 receives and outputs a parallel TTL signal group.

It is understood that the enable signals EN1 and EN2 may be the same signal or different signals, which is not strictly limited in the embodiment of the present application. In addition, the enable signals EN1 and EN2 may be, for example, served as mode switching signals (including the first mode switching signal and the second mode switching signal) output by the mode switching module 54, or obtained after appropriate logic conversion according to the mode switching signals.

It can be appreciated that, based on the control system C300 shown in fig. 3, in the control system C300 shown in fig. 4 and 5, the cascade form of the LED driving chip C60 can be switched between the TTL mode and the LVDS mode according to the requirement, so that the control system C300 can be suitable for more application scenarios.

Further, as shown in fig. 6, the embodiment of the application further discloses a display device, including: a display 400 and a control system C300 as shown in any of the embodiments of the present application. The control system C300 is configured to drive the display 400 according to the parameter data and the image data.

In this embodiment, an LED bead array with M rows and N columns is disposed on the display screen 400, where the LED bead array includes a plurality of LED beads arranged in rows and columns, and M, N is a positive integer greater than 1. Each LED lamp bead comprises an anode and a cathode, and when a forward voltage is applied between the anode and the cathode of the LED lamp bead, the LED lamp bead is lightened. In the display screen 400, a plurality of LED lamp beads are respectively used as pixel units. It is understood that each pixel in display screen 400 may include one or more pixel elements. For example, when displaying a color image, three LED beads may be used to display color components of red, green, and blue (RGB), respectively, each of which generates light of a corresponding color according to its own light emission characteristics, or an additional filter may be used to generate light of a corresponding color.

Illustratively, the display screen 400 includes an LED (Light Emitting Diode ) display screen, an AMOLED (Active-matrix organic light-emitting diode) display screen, a micro LED display screen, or a MiniLED display screen.

In summary, in the embodiment of the application, in the control system, the signal transmitter and the processor are integrated into one scanning card, and the serial-parallel conversion module, the digital module, the parallel-serial conversion module and the driving module are integrated into one LED driving chip, so that the impedance and the interference of signals in the transmission process can be reduced, the integration level is improved, the size of the driving module can be reduced, and the display effect of the LED display screen can be improved; in addition, because the serial-parallel conversion module and the parallel-serial conversion module are integrated in each LED driving chip at the same time, the LED driving chips can conveniently realize multi-chip cascading when transmitting the display data set and the driving signal set at high speed in a serial differential signal set format.

Finally, it should be noted that: it is apparent that the above examples are only examples for clearly illustrating the present application and are not limiting to the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are intended to be within the scope of the present application.

Claims

1. An LED display screen control system, comprising: the scanning card and the LED driving chip coupled with the scanning card are characterized in that,

the scanning card is integrated with:

the LED driving chip is integrated with:

2. The LED display screen control system of claim 1, wherein the number of LED driver chips in said LED display screen control system is at least two, the at least two LED driver chips being arranged in cascade.

3. The LED display control system of claim 1, wherein said scan card further has integrated therein:

4. The LED display control system of claim 3, wherein the signal transmitter is coupled to the mode switching module to receive one of the first mode switching signal and the second mode switching signal,

5. The LED display screen control system of claim 3, wherein the serial-to-parallel conversion module and the parallel-to-serial conversion module further receive an enable signal for controlling the serial-to-parallel conversion module and the parallel-to-serial conversion module to be turned on and off to control the LED driving chip to switch between LVDS mode and TTL mode.

6. The LED display screen control system of any of claims 1-5, wherein the parallel drive signal group and the parallel display data group are TTL signal groups.

7. The LED display screen control system of any of claims 1-5, wherein the serial differential signal group is an LVDS signal group.

8. The LED display screen control system of claim 7, wherein said serial differential signal group is a mini-LVDS signal group.

9. A display device, comprising:

a display screen;

the LED display control system of any one of claims 1-8, for driving the display according to parameter data and image data.

10. The display device of claim 9, wherein the display screen comprises an LED display screen, an AMOLED display screen, a micro LED display screen, or a MiniLED display screen.