Matrix type LED backlight driving system and communication method

Abstract

The invention discloses an LED backlight driving system which comprises an array composed of a plurality of LED driving chips, and each LED driving chip is provided with at least one first data transmission port and a second data transmission port. The LED backlight driving system further comprises a plurality of first signal lines MOSI, and the first data transmission ports of the 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 the LED driving chips in each row share one second signal line MISO. Each LED driving chip is also provided with an enabling control port, and the enabling control port controls whether the first data transmission port and the second data transmission port receive or transmit data by receiving an enabling signal; the LED backlight driving system further comprises a plurality of third signal lines CS, and the enabling control ports of each column of LED driving chips share one third signal line CS.

Description

Technical Field

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

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

[0003] In the existing LED driving system, using a single-bus serial communication link (chain) is an optional and efficient LED driving method. The so-called single-bus serial communication link means that the LED driving chip passes the communication data frame one by one in the communication link in a cascaded manner. However, when a certain LED driving chip or transmission line fails during the signal transmission process, it may cause a black screen or a flower screen phenomenon in the display of this area, seriously affecting the viewing experience. Therefore, at the present stage, the technology of resuming data transmission from breakpoint is proposed to timely repair the signal transmission interruption and ensure the normal operation of the system. The technology of resuming data transmission from breakpoint is realized through redundant design and increasing input / output pins. The specific implementation method is as follows: The LED driving chip automatically detects that there is no input for a long time, and at the same time, when the spare pin detects a signal input, the LED driving chip will automatically switch to the spare pin to receive data and complete the signal reception. Another method is that when the LED driving chip supports two-way communication and there is only one bad point on the link, after the host computer detects the fault point through an algorithm, it can transmit data in reverse, so that all good chips on the link can receive the data.

[0004] However, the above solution requires adding hardware redundancy design, resulting in increased costs. In large-scale application scenarios, the cost issue may become a bottleneck for system applications, and at the same time, it will make the wiring complex. And it is necessary for the host computer to detect in real time whether a fault occurs, increasing software complexity.

[0005] Therefore, in the prior art, there is a need for a new LED backlight driving system that can more effectively solve the abnormal backlight display caused by the failure of the LED driving chip. Summary of the Invention

[0006] The technical object to be achieved by the present invention is to provide a new LED backlight driving system that can more effectively solve the abnormal backlight display caused by the failure of the LED driving chip.

[0007] Based on the above technical object, the present invention provides an LED backlight driving system. The LED backlight driving system includes an array composed of multiple LED driving chips, and at least one first data transmission port and one second data transmission port are provided on each of the LED driving chips.

[0008] The LED backlight driving system further includes multiple 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 includes multiple second signal lines MISO, and the second data transmission ports of each row of LED driving chips share one second signal line MISO.

[0010] Each of the LED driving chips is further provided with an enable control port, 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 includes multiple 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 all connected to the host computer, and the host computer transports 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 multiple LED driving channel pins, and the LED driving channel pins are used to connect to an LED string to directly control the light emission of the LED string.

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

[0014] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the written description, claims and drawings hereof. Brief Description of the Drawings

[0015] The drawings are provided to facilitate a further understanding of the present invention, and constitute a part of the description, and together with the embodiments of the present invention are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0016] Figure 1 is a schematic structural view of the LED backlight driving system of the present invention; Detailed Embodiments

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention 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 to", "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on", "directly adjacent to", "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Thus, the first element, component, region, layer or part discussed below may be denoted as the second element, component, region, layer or part without departing from the teachings of the present invention. And when discussing the second element, component, region, layer or part, it does not necessarily mean that the present invention necessarily has the first element, component, region, layer or part.

[0019] Spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. may be used herein for convenience of description to describe the relationship of one element or feature shown in the figure with other elements or features. It should be understood that, in addition to the orientation shown in the figure, the spatial relationship terms are also intended to include different orientations of the device in use and operation. For example, if the device in the attached drawing is flipped, then an element or feature described as "under other elements" or "beneath them" or "under it" will be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "beneath" can include both the upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are to be interpreted accordingly.

[0020] The purpose of the terms used herein is only to describe specific embodiments and is not a limitation of the present invention. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, specify the presence of the 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. As used herein, the term "and / or" includes any and all combinations of the related listed items.

[0021] Example 1

[0022] As Figure 1 shown in the schematic structural diagram of the LED backlight driving system of the present embodiment, the LED backlight driving system of the present invention includes an array composed of a plurality of LED driving chips, and at least one first data transmission port and one second data transmission port are provided on each of the LED driving chips.

[0023] Each of the LED driving chips has a plurality of LED driving channel pins, and the LED driving channel pins are used to connect an LED string to directly control the light emission of the LED string.

[0024] The LED backlight driving system further includes a plurality of first signal lines MOSI, and the first data transmission ports of the 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 the 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, 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. Meanwhile, 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.

[0027] The first signal line MOSI, the second signal line MISO and the third signal line CS are all connected to the host computer. The host computer transmits backlight brightness data to the LED backlight driving chips on the same row through the first signal line MOSI. Meanwhile, the host computer transmits an enable signal to the LED backlight driving chips on the same column through the third signal line CS. For example, when the host computer needs to transmit backlight brightness data to the LED driving chip in the first row and the first column, it is necessary to transmit the backlight brightness data to the LED driving chips in the first row through the first signal line MOSI0, and at the same time transmit an enable signal 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 this embodiment, the host computer can also transmit backlight brightness data to the first signal line MOSI of multiple rows at the same time, and can also transmit an enable signal to the third signal line CSI of multiple rows at the same time through the host computer.

[0029] In this embodiment, when the host computer needs to read feedback information from a certain LED driving chip, the LED driving chip is also selected in the same way as above, and the feedback information sent by the LED driving chip is read through the second signal line MISO. The feedback information includes fault states such as over-temperature, over-heat, over-voltage, under-voltage, short circuit, and open circuit. Optionally, when the processing capacity of the host computer is limited, the second data transmission port can also be configured to be in a high-impedance state. Once a corresponding fault occurs in the chip, the voltage of the second signal line MISO will be actively pulled low, and the host computer can detect the low voltage and know that there is a corresponding fault state in this row of chips.

[0030] Optionally, in this embodiment, the second signal line MISO can also be omitted, that is, the function of the host computer is relatively simple and only needs to send data to the LED driving chip, so that the routing of MISO can be omitted and the complexity of the board-level routing can be reduced.

[0031] As described above, the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various 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 multiple LED driving chips, and at least one first data transmission port and one second data transmission port are provided on each of the LED driving chips; 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; One enable control port is further provided 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 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 the host computer, and the host computer transmits backlight brightness data to the LED backlight driving chips 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 driving chips has a plurality of LED driving channel pins, and the LED driving channel pins are used to connect an LED lamp string to directly control the light emission of the LED lamp string.

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

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

Images