Mini LED backlight driving system

Abstract

The utility model provides a Mini LED backlight driving system, which comprises a signal processing module, a backlight driving module and a driving chip, video stream signals are output in two paths through the signal processing module, one path is output to an LCD display screen for video playing, and the other path is output to a lamp panel partition brightness signal obtained by converting the video stream signals. The backlight driving module generates dimming signals corresponding to the light control partition units on the basis of the lamp panel partition brightness signals, the driving chip conducts dimming on the corresponding light control partition units on the basis of the dimming signals, independent dimming can be conducted on each light control partition unit of the partition backlight plate, and partition dimming of the partition backlight plate is achieved. Thus, according to the system, a traditional LCD display system can be quickly upgraded into a Mini LED backlight display system supporting partition light control at low cost, better display brightness and contrast are achieved, and meanwhile energy consumption of the system can be remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display technology, and in particular to a Mini LED backlight driving system. Background Technology

[0002] While traditional LCD monitors can provide good resolution and image clarity, they rely on LED backlighting. Since the backlight outputs a constant power and is always on and provides uniform illumination, it is impossible to control the backlight in different zones. Therefore, they are still insufficient in rendering deep blacks and high-contrast images. Utility Model Content

[0003] The purpose of this invention is to provide a Mini LED backlight driving system that can upgrade a traditional LCD display system to a Mini LED backlight display system that supports local dimming, thereby achieving better display brightness and contrast.

[0004] To solve the above technical problems, this utility model provides a Mini LED backlight driving system, which includes a signal processing module, a backlight driving module connected to the signal processing module, and multiple driving chips connected to the backlight driving module.

[0005] The input terminal of the signal processing module is connected to the display system, receives the video stream signal from the display system, obtains the video brightness signal based on the video stream signal, and converts the video brightness signal into a lamp panel partition brightness signal; the signal processing module has two outputs, one of which forwards the video stream signal to the LCD display screen, and the other output sends the lamp panel partition brightness signal to the backlight driver module;

[0006] The backlight driving module outputs a dimming signal to each of the driving chips based on the brightness signal of the lamp board partition. The multiple dimming signals correspond one-to-one with the multiple light control partition units of the partitioned backlight board.

[0007] Multiple driving chips are connected one-to-one with the light control partition units of the partition backlight panel, and the driving chips adjust the light control partition units based on the dimming signal.

[0008] Optionally, the signal processing module and the backlight driving module communicate with each other via SPI, UART, or I2C protocols.

[0009] Optionally, both the signal processing module and the backlight driving module are configured based on an FPGA chip or a microcontroller.

[0010] Optionally, the signal processing module includes a GW1N-LV9 chip, and the backlight driving module includes a GWIN_LV1 chip.

[0011] Optionally, the Mini LED backlight driving system further includes a power processing module, which converts the power supply voltage into power supply voltages adapted to the signal processing module, the backlight driving module, the driving chip, and the partitioned backlight panel, respectively.

[0012] Optionally, the power processing module includes a TPS54620RHLR chip and a TPS7A7001DDAR chip.

[0013] Optionally, the Mini LED backlight driving system further includes a peripheral interface circuit, which includes a signal input interface circuit, a signal output interface circuit, and a lamp board interface circuit. The signal input interface circuit receives the video stream signal from the display system and transmits it to the signal processing module. The signal processing module forwards the video stream signal to the LCD display screen through the signal output interface circuit. The lamp board interface circuit serves as the output interface for the dimming signal, sending the dimming signal to the driver chip, and also as the power interface for the partitioned backlight panel.

[0014] Optionally, the lamp board interface circuit operates in a single-wire serial manner.

[0015] Optionally, the light control partition unit of the partitioned backlight panel includes multiple LED beads.

[0016] The Mini LED backlight driving system described above uses a signal processing module to output the video stream signal in two paths. One path is output to the LCD screen for video playback, and the other path outputs the converted LED panel brightness signals. The backlight driving module then generates dimming signals corresponding to the local dimming units based on these signals. The driver chip dims the corresponding local dimming units based on these signals, allowing for independent dimming of each local dimming unit on the backlight panel. This enables local dimming of the entire backlight panel. In this way, this system can quickly upgrade a traditional LCD display system to a Mini LED backlight display system supporting local dimming at a relatively low cost, achieving better display brightness and contrast while significantly reducing system energy consumption. Attached Figure Description

[0017] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention. Wherein:

[0018] Figure 1This is a schematic diagram of a Mini LED backlight driving system according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of a signal processing module according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of a backlight driving module according to an embodiment of the present invention;

[0021] Figure 4 This is a circuit diagram of a power processing module according to an embodiment of the present invention;

[0022] Figure 5 This is another circuit diagram of the power processing module according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the signal input port circuit according to an embodiment of the present invention;

[0024] Figure 7 This is a schematic diagram of the signal output port circuit of an embodiment of the present invention;

[0025] Figure 8 This is a schematic diagram of the lamp board interface circuit according to an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, advantages, and features of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the objectives of the embodiments of this utility model. Furthermore, the structures shown in the drawings are often part of the actual structure. In particular, different drawings may emphasize different aspects and sometimes use different scales.

[0027] As used in this invention, the singular forms “a,” “an,” and “the” include plural objects; the term “or” is generally used to include the meaning of “and / or”; the term “a number” is generally used to include the meaning of “at least one”; and the term “at least two” is generally used to include the meaning of “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature. “One end” and “the other end,” as well as “proximal end” and “far end,” generally refer to two corresponding parts, including not only endpoints. The terms “installed,” “connected,” and “joined” should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two elements or the interaction between two elements. Furthermore, as used in this invention, the phrase "one element is disposed on another element" generally only indicates that there is a connection, coupling, cooperation, or transmission relationship between the two elements. This connection, coupling, cooperation, or transmission can be direct or indirect through an intermediate element, and should not be construed as indicating or implying a spatial positional relationship between the two elements. That is, one element can be located arbitrarily inside, outside, above, below, or to one side of the other element, unless otherwise explicitly stated. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Figure 1 This is a schematic diagram of a Mini LED backlight driving system according to an embodiment of the present invention. (See attached diagram.) Figure 1This utility model schematically provides a Mini LED backlight driving system, which includes a signal processing module 20, a backlight driving module 30 connected to the signal processing module 20, and multiple driving chips (not shown) connected to the backlight driving module 30. The input terminal of the signal processing module 20 is connected to the display system 10, receives the video stream signal (video stream data) from the display system 10, extracts the video brightness signal based on the video stream signal, and converts the video brightness signal into a lamp panel partition brightness signal. The format of the video stream signal is, for example, LVDS, MIPI, or HDMI. The signal processing module 20 receives and buffers each frame of video image in the video stream signal. The signal processing module 20 outputs in two ways: one output forwards the video stream signal to the LCD display screen 40, and the other output sends the lamp panel partition brightness signal to the backlight driving module 30. The backlight driving module 30 outputs a dimming signal to each of the driving chips based on the lamp panel partition brightness signal, wherein the multiple dimming signals correspond one-to-one with multiple light control partition units of the partitioned backlight panel 50. That is, the backlight driving module 30 converts the brightness signal of the lamp board partition into multiple dimming signals according to the layout of each dimming partition unit on the partition backlight panel 50, with each dimming signal corresponding to a dimming partition unit. Multiple driving chips are connected one-to-one with the dimming partition units of the partition backlight panel 50. The driving chips dim the dimming of the dimming partition units based on the dimming signals, thereby changing the brightness of the partition backlight panel 50. As those skilled in the art will understand, adjusting the brightness of the partition backlight panel 50 can also achieve the adjustment of the display brightness of the LCD display screen 40. In one embodiment, the dimming partition unit includes multiple LED beads, and the partition backlight panel 50 can be arranged in a partition matrix. For example, the dimming partition units of the partition backlight panel 50 can be arranged in 18 rows and 16 columns, totaling 288 dimming partition units. Each dimming partition includes multiple LED beads connected in series. The driving chips, LED beads, and matching circuits can be integrated onto a single circuit board.

[0029] The Mini LED backlight driving system described above uses a signal processing module 20 to output the video stream signal in two paths. One path is output to the LCD display screen 40 for video playback, and the other path outputs the lamp panel zonal brightness signal converted from the video stream signal. This allows the backlight driving module 30 to generate dimming signals corresponding to the light control zonal units based on the lamp panel zonal brightness signals. The driving chip then dims the corresponding light control zonal units based on the dimming signals, enabling independent dimming of each light control zonal unit of the zonal backlight panel 50, thus achieving zonal dimming of the zonal backlight panel 50. In this way, this system can quickly upgrade a traditional LCD display system to a Mini LED backlight display system 10 that supports zonal dimming at a lower cost, achieving better display brightness and contrast while significantly reducing system energy consumption.

[0030] In one embodiment, the signal processing module 20 and the backlight driving module 30 are connected via SPI, UART or I2C protocols to transmit the brightness signals of the light zones.

[0031] In one embodiment, both the signal processing module 20 and the backlight driving module 30 are configured based on an FPGA chip or a microcontroller. For example, the signal processing module 20 is configured based on a GW1N-LV9 chip (…). Figure 2 As shown), the backlight driver module 30 includes a GWIN_LV1 chip configuration ( Figure 3 (As shown).

[0032] Furthermore, the Mini LED backlight driving system also includes a power processing module 60, which converts the power supply voltage into power supply voltages adapted to the signal processing module 20, the backlight driving module 30, the driver chip, and the partitioned backlight panel 50, respectively. Each module requires a different power supply voltage, and the power processing module 60 performs DC-DC conversion on the power supply voltage to generate a power supply voltage suitable for the corresponding module. For example, the power processing module 60 can convert a 12V power supply voltage into 1.2V, 2.5V, 3.3V, and 5V power supply voltages, which are then output to the corresponding modules for power supply.

[0033] In one embodiment, the power processing module 60 is configured based on the TPS54620RHLR chip and the TPS7A7001DDAR chip to convert the power supply voltage into multiple different supply voltages. For example, Figure 4 The circuit based on the TPS54620RHLR chip can convert 12V voltage to internal 5V voltage. Figure 5The circuit based on the TPS7A7001DDAR chip can convert 5V to 3.3V. It should be noted that, to meet the needs of other power supply voltages, multiple circuits based on the TPS7A7001DDAR chip can be configured. By adjusting the parameters of the corresponding components, the conversion of 5V to other power supply voltages can be achieved. For example, two additional circuits based on the TPS7A7001DDAR chip can be configured to convert 5V to 1.2V and 5V to 2.5V.

[0034] Furthermore, the Mini LED backlight driving system also includes peripheral interface circuitry, comprising a signal input interface circuit 71, a signal output interface circuit 72, and a lamp board interface circuit 73. The signal input interface circuit 71 receives the video stream signal (LVDS, MIPI, or HDMI format) from the display system 10 and transmits it to the signal processing module 20. The signal processing module 20 forwards the video stream signal to the LCD display screen 40 via the signal output interface circuit 72. The lamp board interface circuit 73 is connected to the partition backlight panel 50. The lamp board interface circuit 73 serves as an output interface for dimming signals, sending the dimming signals to the driver chip, and as a power interface for the partition backlight panel 50, supplying power to the partition backlight panel 50. The lamp board interface circuit 73 operates in a single-wire serial manner, thereby transmitting the dimming signals to the driver chip. (See also...) Figure 6 and Figure 7 For example, the signal input interface circuit 71 is configured as a connector with 30 pins (J4), and the signal output port is configured as a connector with 30 pins (J5). See also Figure 8 For example, the lamp board interface circuit 73 is configured with two connectors (J6 and J70), each connector having 30 pins. One connector is used to transmit a dimming signal to the backlight driver module 30, and the other connector transmits a power signal to the partition backlight board 50.

[0035] Although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the technical solutions of the present invention based on the disclosed technical content, or equivalent embodiments can be modified accordingly, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A Mini LED backlight driving system, characterized in that, It includes a signal processing module, a backlight driving module connected to the signal processing module, and multiple driver chips connected to the backlight driving module: The input terminal of the signal processing module is connected to the display system, receives the video stream signal from the display system, obtains the video brightness signal based on the video stream signal, and converts the video brightness signal into a lamp panel partition brightness signal; the signal processing module has two outputs, one of which forwards the video stream signal to the LCD display screen, and the other output sends the lamp panel partition brightness signal to the backlight driver module; The backlight driving module outputs a dimming signal to each of the driving chips based on the brightness signal of the lamp board partition. The multiple dimming signals correspond one-to-one with the multiple light control partition units of the partitioned backlight board. Multiple driving chips are connected one-to-one with the light control partition units of the partition backlight panel, and the driving chips adjust the light control partition units based on the dimming signal.

2. The Mini LED backlight driving system according to claim 1, characterized in that, The signal processing module and the backlight driving module communicate with each other via SPI, UART or I2C protocols.

3. The Mini LED backlight driving system according to claim 1, characterized in that, Both the signal processing module and the backlight driving module are configured based on FPGA chips or microcontrollers.

4. The Mini LED backlight driving system according to claim 3, characterized in that, The signal processing module includes a GW1N-LV9 chip, and the backlight driving module includes a GWIN_LV1 chip.

5. The Mini LED backlight driving system according to claim 1, characterized in that, The Mini LED backlight driving system also includes a power processing module, which converts the power supply voltage into power supply voltages adapted to the signal processing module, the backlight driving module, the driving chip, and the partitioned backlight panel.

6. The Mini LED backlight driving system according to claim 5, characterized in that, The power processing module includes a TPS54620RHLR chip and a TPS7A7001DDAR chip.

7. The Mini LED backlight driving system according to claim 1, characterized in that, The Mini LED backlight driving system also includes peripheral interface circuits, which include signal input interface circuits, signal output interface circuits, and lamp board interface circuits. The signal input interface circuit receives the video stream signal from the display system and transmits it to the signal processing module. The signal processing module forwards the video stream signal to the LCD display screen through the signal output interface circuit. The lamp board interface circuit serves as the output interface for the dimming signal, sending the dimming signal to the driver chip, and also serves as the power interface for the partitioned backlight panel.

8. The Mini LED backlight driving system according to claim 7, characterized in that, The lamp board interface circuit operates in a single-wire serial manner.

9. The Mini LED backlight driving system according to claim 1, characterized in that, The light control zone unit of the partitioned backlight panel includes multiple LED beads.

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