Novel display screen backlight LED driving system and circuit

Abstract

The utility model provides a novel display screen backlight LED driving system and circuit, the novel display screen backlight LED driving system comprises an LCD display module and an LCD driving PCBA, the LCD display module comprises two lamp sets, and the LCD driving PCBA comprises two backlight driving units. Two lamp sets and two backlight driving units are arranged, and one lamp set is correspondingly connected with one backlight driving unit. The design of the backlight circuit is optimized again in combination with the characteristics of a side-in backlight circuit, and meanwhile, a driving unit supporting multiple strings of lamps is changed into two driving units supporting few strings of lamps, so that the reliability of the backlight circuit can be improved, redundant design is provided for the backlight circuit, and functional safety requirements are met; the highest point temperature in the display screen is reduced, the product experience is improved, and the product life is prolonged. And the performance requirement on the driving IC is reduced, and cost reduction and universality management of materials are facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of display screens, and in particular to a novel display screen backlight LED driving system and circuit. Background Art

[0002] LCD screens currently play a crucial role in automotive electronics. As the driver's most direct means of obtaining vehicle information, automotive instrument clusters must meet the highest reliability standards. With the increasing focus on functional safety standards, automotive instrument clusters are now required to comply with ISO 26262 ASILB standards. However, the display itself is illuminated by LED strips located on the sides, which then pass through optical film materials such as light guides to ensure the entire display is functioning properly.

[0003] Due to driving voltage requirements, LED light strips typically consist of multiple strings connected in parallel. Traditional designs utilize proximity-based routing for ease of wiring and utilize a single backlight driver IC. This results in the display screen in the vicinity becoming black and missing instrument information if a string of lights fails. Furthermore, a single-driver design can lead to heat concentration, hindering heat dissipation and shortening product lifespan. Utility Model Content

[0004] To solve the above technical problems, the present application provides a new display backlight LED driving system and circuit, which drives two groups of lights respectively through dual backlight driving units to ensure the stability of the display screen.

[0005] In the first aspect, the present application provides a new display screen backlight LED driving system, including an LCD display module and an LCD driving PCBA, wherein the LCD display module includes: an LCD backlight circuit, and the LCD backlight circuit includes: a first lamp group and a second lamp group; the LCD driving PCBA includes: a first backlight driving unit and a second backlight driving unit; the first lamp group is connected to the first backlight driving unit, and the second lamp group is connected to the second backlight driving unit.

[0006] By utilizing two sets of lamps and two backlight drive units, this new device can maintain normal display even if one lamp fails. While the display brightness may decrease due to some lamp failures, the display remains evenly lit. According to ISO 26262, a reduction in backlight brightness is considered a functional degradation, but it does not constitute a functional failure.

[0007] At the same time, the proposed solution reduces the driving capability requirements of the driver IC. This is because a single driver IC solution concentrates heat, which is not conducive to product heat dissipation. A dual driver IC solution disperses power consumption, eliminating concentrated heat generation. Furthermore, because the load is halved, dual driver ICs can achieve a wider operating voltage range and better ripple control.

[0008] As a preferred embodiment, the LCD driver PCBA further includes: a power supply and a power protection unit for supplying power to the first backlight driver unit and the second backlight driver unit.

[0009] As a preferred embodiment, the LCD driver PCBA further includes: a power supply module receiving power provided by the power supply and power protection unit, and transmitting it to a logic control unit; the logic control unit sending a control signal to the first backlight driver unit and the second backlight driver unit.

[0010] The first and second backlight driver units are housed within the LCD driver PCBA. Other modules within the PCBA provide power and control signals to the first and second backlight driver units. These control signals adjust the brightness of the light cluster and other related parameters.

[0011] As a preferred embodiment, the first light group and the second light group are alternately placed on the LCD display module.

[0012] The first light group and the second light group are placed alternately to ensure that when one light group fails and the other light group works normally, the display screen can still be evenly illuminated to prevent the display screen from malfunctioning.

[0013] As a preferred embodiment, the first lamp group and the first backlight driving unit, as well as the second lamp group and the second backlight driving unit are connected via an FPC.

[0014] As a preferred embodiment, the first backlight driving unit includes: a first driving chip; the second backlight driving unit includes: a second driving chip.

[0015] Backlight driver ICs (chips) control the backlighting system of liquid crystal displays (LCDs) or other displays, ensuring the brightness and uniformity of the display. They adjust backlight brightness, support PWM (pulse-width modulation) dimming for more efficient brightness control, and provide stable power output to ensure the backlight (such as LEDs) function properly under varying operating conditions.

[0016] As a preferred embodiment, the LCD display module further includes: an LCD display panel placed above the LCD backlight circuit.

[0017] An optical film material such as a light guide plate is provided between the LCD display panel and the LCD backlight circuit. The display of the LCD display panel is displayed by projecting the bright light of the LCD backlight circuit onto the LCD display panel.

[0018] In a second aspect, the present application proposes a novel display backlight LED driving circuit, characterized in that the novel display backlight LED driving circuit comprises: the novel display backlight LED driving system and circuit protection board described in the first aspect, wherein the novel display backlight LED driving system is integrated on the circuit protection board.

[0019] In summary, this application proposes a novel display backlight LED driver system and circuit. The system includes an LCD display module and an LCD driver PCBA. The LCD display module includes two lamp groups, and the LCD driver PCBA includes two backlight driver units. This application provides two lamp groups and two backlight driver units, with each lamp group connected to one backlight driver unit.

[0020] Compared with the prior art, this application has at least the following beneficial effects:

[0021] By optimizing the backlight circuit design based on the characteristics of edge-lit backlight circuits and replacing one driver unit supporting multiple strings with two supporting fewer strings, the reliability of the backlight circuit is improved, redundancy is provided, and functional safety requirements are met. This also reduces the maximum temperature within the display, enhancing the user experience and extending product life. Lowering the performance requirements for the driver IC also contributes to material cost reduction and universal management. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attachment Figure 1 This is a structural diagram of a new display screen backlight LED drive system according to an embodiment of the present utility model.

[0023] Attachment Figure 2 This is a circuit connection diagram of the backlight driving unit and the lamp group shown in an embodiment of the present utility model. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only

[0025] The embodiments of this application are part of the embodiments, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application.

[0026] The following are detailed descriptions of each.

[0027] The terms "first", "second", "third" and "third" in the specification, claims and drawings of this application are used interchangeably.

[0028] "four" and the like are used to distinguish different objects rather than to describe a specific order. In addition, the term "comprise" and any variations thereof are intended to cover non-exclusive inclusions. For example, a system including a series of modules and devices is not limited to the listed modules and devices, but may optionally include modules and devices that are not listed, or may optionally include other modules and devices that are inherent to these systems.

[0029] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] Example 1:

[0031] The present invention provides a novel display backlight LED drive system, which includes an LCD display module and an LCD driver PCBA. The LCD display module includes an LCD backlight circuit, which includes a first lamp group and a second lamp group. The LCD driver PCBA includes a first backlight drive unit and a second backlight drive unit. The first lamp group is connected to the first backlight drive unit, and the second lamp group is connected to the second backlight drive unit.

[0032] As attached Figure 1 The following figure shows a novel display backlight LED driver system, which is applied to a vehicle instrument panel and comprises two main parts: an LCD display module and an LCD driver PCBA. The LCD driver PCBA transmits display information to the LCD display module, which then directly displays the relevant information.

[0033] In an embodiment of the present invention, optionally, the LCD driver PCBA includes: a power supply and a power protection unit for supplying power to the first backlight driver unit and the second backlight driver unit.

[0034] In an embodiment of the present invention, optionally, the LCD driver PCBA further includes: a power supply module receiving power provided by the power supply and power protection unit, and transmitting the power to a logic control unit; the logic control unit sending a control signal to the first backlight driver unit and the second backlight driver unit.

[0035] The power supply and power protection unit is connected to the power supply module, and the first and second backlight driver units provide power to the entire LCD driver PCBA. The power protection unit is an electronic component or module used to protect the power supply system and connected devices. Its primary function is to prevent damage to circuits and devices caused by power failures, overvoltage, overcurrent, short circuits, and other conditions. It primarily includes the following functions: monitoring power supply voltage to cut off or limit the power supply when the voltage exceeds a set value; monitoring current to automatically limit or cut off the power supply when the current exceeds a safe range; quickly cutting off the power supply in the event of a short circuit to prevent circuit damage and fire risks; monitoring device temperature to prevent failures caused by overheating by automatically reducing power or shutting down the device; and protecting the device from damage caused by transient high-voltage surges (such as lightning strikes and switching operations).

[0036] The power protection unit may be composed of one or more of a fuse, a varistor, a TVS transient diode, a current sensor or a temperature sensor, but is not limited thereto.

[0037] The power supply module is connected to the logic control unit, and the power supply module may include a voltage converter for converting the voltage provided by the power supply into the voltage required by the logic control unit.

[0038] The logic control unit can be a control chip, which may include a microcontroller (MCU), a digital signal processor (DSP), a field programmable gate array (FPGA), or a system-on-chip (SoC). The logic control unit is configured to receive vehicle speed information, fuel consumption information, wheel speed information, or water tank temperature information, and generate control information that is transmitted to the backlight drive unit in real time.

[0039] Backlight driver ICs (chips) control the backlighting system of liquid crystal displays (LCDs) or other displays, ensuring the brightness and uniformity of the display. They adjust backlight brightness, support PWM (pulse-width modulation) dimming for more efficient brightness control, and provide stable power output to ensure the backlight (such as LEDs) function properly under varying operating conditions.

[0040] In the embodiment of the present utility model, optionally, as shown in the attached Figure 2Figure 1 shows the circuit connection diagram between the backlight driver unit and the light cluster. The backlight driver unit includes a backlight driver IC and peripheral circuitry. The backlight driver IC is MPQ3368. The anodes of each light string are connected to the LCD backlight circuit, while the cathodes of each light string are connected to a pin of the driver IC for control. The backlight driver IC receives control information and controls the LCD backlight circuit's display in real time.

[0041] In an embodiment of the present invention, optionally, the first light group and the second light group are alternately placed on the LCD display module.

[0042] In this embodiment, Figure 1 As shown, the first light group is red and the second light group is green. The red and green light groups are placed alternately, and the backlight drive circuit is also divided into two control paths. The number of channels that a single-path drive circuit needs to support is halved.

[0043] Because the red and green light groups are staggered, if one group or driver circuit experiences an error, the other groups or driver circuits will continue to operate. This will cause the overall brightness of the display to decrease due to some lights not lighting up, but the display will still be evenly illuminated. According to ISO 26262, a decrease in backlight brightness is considered a functional degradation, but it does not constitute a functional failure.

[0044] Furthermore, because the entire LCD backlight circuit is split into two, the required driving capability of the driver IC is reduced. Furthermore, because a single driver IC solution concentrates heat, it is not conducive to product heat dissipation. A dual driver IC solution disperses power consumption and eliminates concentrated heat generation. Furthermore, because the load is halved, dual driver ICs can achieve a wider operating voltage range and better ripple control.

[0045] In an embodiment of the present invention, optionally, the first lamp group and the first backlight driving unit, as well as the second lamp group and the second backlight driving unit are connected via an FPC.

[0046] FPC (Flexible Printed Circuit) is a circuit board with a flexible substrate, usually made of materials such as polyester and polyimide. This type of circuit board is thin, flexible, and has high density.

[0047] Using this material to connect the backlight drive unit and the light cluster makes the vehicle instrument panel more flexible, allowing for flexible application in different shapes and spaces, and enabling the integration of more circuits within a limited space. Furthermore, compared to traditional rigid circuit boards, FPCs are lighter and thinner, facilitating lightweight product design.

[0048] In an embodiment of the present invention, optionally, the LCD display module further includes: an LCD display panel, placed above the LCD backlight circuit.

[0049] An optical film material such as a light guide plate is provided between the LCD display panel and the LCD backlight circuit. The display of the LCD display panel is displayed by projecting the bright light of the LCD backlight circuit onto the LCD display panel.

[0050] The driver IC controls the brightness of the lamp beads in the lamp group of the LCD backlight circuit, and then controls the LCD display panel to display the corresponding vehicle information.

[0051] Example 2:

[0052] This application proposes a novel display backlight LED driving circuit, characterized in that the novel display backlight LED driving circuit comprises: the novel display backlight LED driving system and a circuit protection board described in Example 1, wherein the novel display backlight LED driving system is integrated on the circuit protection board.

[0053] In summary, this application proposes a novel display backlight LED driver system and circuit. The system includes an LCD display module and an LCD driver PCBA. The LCD display module includes two lamp groups, and the LCD driver PCBA includes two backlight driver units. This application provides two lamp groups and two backlight driver units, with each lamp group connected to one backlight driver unit.

[0054] By optimizing the backlight circuit design based on the characteristics of edge-lit backlight circuits and replacing one driver unit supporting multiple strings with two supporting fewer strings, the reliability of the backlight circuit is improved, redundancy is provided, and functional safety requirements are met. This also reduces the maximum temperature within the display, enhancing the user experience and extending product life. Lowering the performance requirements for the driver IC also contributes to material cost reduction and universal management.

[0055] In several embodiments provided in the present application, it is understood that each box in the flow chart or block diagram can represent a part of a module, program segment or code, and the part of the module, program segment or code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which depends on the functions involved.

[0056] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling an electronic device to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0057] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application by those skilled in the art should be included within the scope of protection of this application.

Claims

1. A new display backlight LED drive system, including an LCD display module and an LCD driver PCBA, characterized in that: The LCD display module includes: an LCD backlight circuit, the LCD backlight circuit includes: a first lamp group and a second lamp group; the LCD driver PCBA includes: a first backlight driving unit and a second backlight driving unit; the first lamp group is connected to the first backlight driving unit, and the second lamp group is connected to the second backlight driving unit.

2. The novel display backlight LED driving system according to claim 1 is characterized in that: The LCD driver PCBA further includes a power supply and a power protection unit for supplying power to the first backlight driver unit and the second backlight driver unit.

3. The novel display backlight LED driving system according to claim 2, characterized in that: The LCD driver PCBA further includes: a power supply module receiving power provided by the power supply and power protection unit and transmitting the power to a logic control unit; the logic control unit sending a control signal to the first backlight driving unit and the second backlight driving unit.

4. The novel display backlight LED driving system according to claim 1, characterized in that: The first light group and the second light group are alternately placed on the LCD display module.

5. The novel display backlight LED driving system according to claim 1 is characterized in that: The first lamp group and the first backlight driving unit are connected as well as the second lamp group and the second backlight driving unit are connected via an FPC.

6. The novel display backlight LED driving system according to claim 1, characterized in that: The first backlight driving unit includes a first driving chip; the second backlight driving unit includes a second driving chip.

7. The novel display backlight LED driving system according to claim 1, characterized in that: The LCD display module further includes: an LCD display panel placed above the LCD backlight circuit.

8. A new display backlight LED driver circuit, characterized in that: The novel display backlight LED driving circuit comprises: the novel display backlight LED driving system and a circuit protection board according to any one of claims 1 to 7, wherein the novel display backlight LED driving system is integrated on the circuit protection board.

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