Matrix led backlight driving system and communication method

Abstract

The application discloses an LED backlight driving system, which comprises an array of a plurality of LED driving chips, wherein at least one first data transmission port and one second data transmission port are arranged on each of the LED driving chips; the LED backlight driving system further comprises a plurality of first signal lines MOSI, and the first data transmission ports of LED driving chips in each row share one first signal line MOSI; the LED backlight driving system further comprises a plurality of second signal lines MISO, and the second data transmission ports of LED driving chips in each row share one second signal line MISO; an enable control port is further arranged on each of the LED driving chips, and the enable control port controls whether the first data transmission port and the second data transmission port receive or transmit data by receiving an enable signal; and the LED backlight driving system further comprises a plurality of third signal lines CS, and the enable control ports of LED driving chips in each column share one third signal line CS.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED backlight, in particular to a matrix LED backlight driving system and a communication method. BACKGROUND

[0002] With the development of display technology, on the basis of traditional LCD display, Mini-LED display, OLED display and Micro-LED display gradually become the three main directions of display technology development. However, among them, the OLED display technology is limited by the material properties, and the pixel ablation problem is still difficult to solve. And the Micro-LED technology still needs to rely on the efficiency of solving the mass transfer technology to make it more cost-effective to be applied to large-size displays. Therefore, in the current situation, the LCD display using the direct type Mini-LED backlight panel is the best display solution. The so-called direct type Mini-LED backlight panel refers to a high-density LED array composed of more fine Mini LED beads (the size is reduced to 100 microns or less), and the entire backlight panel can be divided into multiple backlight partitions, and the number of each backlight partition can be increased from dozens of traditional LEDs to hundreds or even tens of thousands. Therefore, how to drive and control the large number of Mini LED beads to make their luminous brightness better match the display of the liquid crystal panel has become the core problem in the application of Mini-LED backlight panel.

[0003] In the LED driving system in the prior art, using a single bus serial communication link is a selectable efficient LED driving method, that is, the LED driving chip transmits communication data frames in the communication link by connecting step by step. However, when a fault occurs in a certain LED driving chip or transmission line during signal transmission, it may cause the display in this area to appear black screen or screen phenomenon, which seriously affects the viewing experience. Therefore, at present, the breakpoint continuation technology is used to repair the interruption of signal transmission in time and ensure the normal work of the system. The breakpoint continuation technology is realized by redundant design and increasing input and output pins, and the specific implementation manner is as follows: the LED driving chip automatically detects that there is no input for a long time, and the standby pin detects that there is signal input, the LED driving chip will automatically switch to the standby pin to receive data and complete the reception of the signal. Another way is that when the LED driving chip supports bidirectional communication and there is only one bad point on the link, the host computer can detect the fault point through an algorithm, and transmit data in reverse direction, so that all good chips on the link can receive data.

[0004] However, the above solution needs to increase the hardware redundancy design, resulting in the cost rising, in the large-scale application scenario, the cost problem can become the bottleneck of the system application, and the wiring becomes complex. And the host computer needs to detect whether a fault occurs in real time, increasing the software complexity.

[0005] Therefore, it is necessary to provide a new LED backlight driving system in the prior art, which can more effectively solve the abnormal backlight display caused by the failure of the LED driving chip. SUMMARY

[0006] The technical purpose of the present application is to provide a new LED backlight driving system, which can more effectively solve the abnormal backlight display caused by the failure of the LED driving chip.

[0007] Based on the above technical purpose, the present application provides an LED backlight driving system, which comprises an array composed of a plurality of LED driving chips, wherein at least one first data transmission port and one second data transmission port are arranged on each of the LED driving chips.

[0008] The LED backlight driving system further comprises a plurality of first signal lines MOSI, and the first data transmission ports of each row of LED driving chips share one first signal line MOSI.

[0009] The LED backlight driving system further comprises a plurality of second signal lines MISO, and the second data transmission ports of each row of LED driving chips share one second signal line MISO.

[0010] An enable control port is further arranged on each of the LED driving chips, and the enable control port controls whether the first data transmission port and the second data transmission port receive or transmit data by receiving an enable signal; the LED backlight driving system further comprises a plurality of third signal lines CS, and the enable control ports of each column of LED driving chips share one third signal line CS.

[0011] In one embodiment, the first signal line MOSI, the second signal line MISO and the third signal line CS are connected to the host computer, and the host computer transmits the backlight brightness data to the LED backlight driving chips on the same row through the first signal line MOSI.

[0012] In one embodiment, each of the LED driving chips has a plurality of LED driving channel pins, and the LED driving channel pins are used to connect the LED lamp string to directly control the light emission of the LED lamp string.

[0013] In one embodiment, the feedback information emitted by the LED driving chip is read through the second signal line MISO.

[0014] Other features and advantages of the present application will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the application. The purposes and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0016] Figure 1 is a schematic diagram of the LED backlight driving system structure of the present application; DETAILED DESCRIPTION

[0017] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0018] It should be understood that when an element or layer is referred to as being "on", "adjacent", "connected to" or "coupled to" another element or layer, it can be directly on, adjacent, connected or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly adjacent", "directly connected to" or "directly coupled to" another element or layer, then there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application. Similarly, a second element, component, region, layer or section discussed below could be termed a first element, component, region, layer or section without departing from the teachings of the present application.

[0019] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and / or

[0020] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0021] Example 1

[0022] As Figure 1 The LED backlight driving system of the present embodiment includes an array of a plurality of LED driving chips, wherein each of the LED driving chips is provided with at least one first data transmission port and one second data transmission port.

[0023] Each of the LED driving chips has a plurality of LED driving channel pins for connecting LED lamp strings to directly control the light emission of the LED lamp strings.

[0024] The LED backlight driving system further includes a plurality of first signal lines MOSI, and the first data transmission ports of LED driving chips in each row share one first signal line MOSI.

[0025] The LED backlight driving system further includes a plurality of second signal lines MISO, and the second data transmission ports of LED driving chips in each row share one second signal line MISO.

[0026] Each of the LED driving chips is further provided with an enable control port, which controls whether the first data transmission port and the second data transmission port receive or transmit data by receiving an enable signal. Meanwhile, the LED backlight driving system further comprises a plurality of third signal lines CS, and the enable control ports of LED driving chips in each column share a third signal line CS.

[0027] The first signal line MOSI, the second signal line MISO and the third signal line CS are connected to an upper host, the upper host transmits backlight brightness data to the LED backlight driving chips in the same row through the first signal line MOSI, and simultaneously transmits an enable signal to the LED backlight driving chips in the same column through the third signal line CS. For example, when the upper host needs to transmit backlight brightness data to the LED driving chips in the first row and the first column, the backlight brightness data needs to be transmitted to the LED driving chips in the first row through the first signal line MOSI0, and simultaneously the enable signal needs to be transmitted to the LED driving chips in the first column through the third signal line CS, so that only the LED driving chips in the first row and the first column receive the backlight brightness data.

[0028] Similarly, in the embodiment, the upper host can also transmit backlight brightness data to a plurality of first signal lines MOSI simultaneously, and can also transmit an enable signal to a plurality of third signal lines CSI simultaneously.

[0029] In the embodiment, when the upper host needs to read feedback information from a certain LED driving chip, the LED driving chip is selected by the above-mentioned method, and the feedback information emitted by the LED driving chip is read through the second signal line MISO. The feedback information includes fault states such as over-temperature, over-heating, over-voltage, under-voltage, short circuit and open circuit. Alternatively, when the processing capacity of the upper host is limited, the second data transmission port can also be configured to be in a high resistance state, and once the chip has a corresponding fault, the voltage of the second signal line MISO will be actively pulled down. The upper host can detect the low voltage, and can know that the chip in the row has a corresponding fault state.

[0030] Alternatively, in the embodiment, the second signal line MISO can also be omitted, that is, the function of the host is relatively simple, and only data needs to be sent to the LED driving chip. In this way, the wiring of MISO can be omitted, and the complexity of the board-level wiring can be reduced.

[0031] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An LED backlight driving system, characterized in that: The LED backlight driving system includes an array composed of a plurality of LED driving chips, wherein each of the LED driving chips is provided with at least one first data transmission port and one second data transmission port; The LED backlight driving system further includes a plurality of first signal lines MOSI, and the first data transmission ports of each row of LED driving chips share one first signal line MOSI; The LED backlight driving system further includes a plurality of second signal lines MISO, and the second data transmission ports of each row of LED driving chips share one second signal line MISO; Each of the LED driver chips is further provided with an enable control port, which controls whether the first data transmission port and the second data transmission port receive or transmit data by receiving an enable signal; The LED backlight driving system further includes a plurality of third signal lines CS, and the enable control ports of each column of LED driving chips share one third signal line CS.

2. The LED backlight driving system according to claim 1, wherein: The first signal line MOSI, the second signal line MISO and the third signal line CS are all connected to a host computer. The host computer transmits backlight brightness data to the LED backlight driver chip on the same row through the first signal line MOSI.

3. The LED backlight driving system according to claim 1, wherein: Each of the LED driver chips has a plurality of LED driver channel pins, and the LED driver channel pins are used to connect to an LED light string to directly control the light emission of the LED light string.

4. The LED backlight driving system according to claim 1, wherein: The feedback information sent by the LED driver chip is read through the second signal line MISO.

5. An LED backlight panel, wherein the LED backlight panel uses the LED backlight driving system according to any one of claims 1 to 4 to drive an LED light string to emit light.

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