Vehicle-mounted MINI display screen LD backlight system

Abstract

The utility model belongs to the technical field of display screen backlight, particularly relates to a vehicle-mounted MINI display screen LD backlight system, and aims to solve the problems that the brightness of a traditional LCD central control screen is generally low, the brightness is obviously not enough when a driver drives in the daytime, the driving navigation of the driver is influenced, and the like. In order to solve the problem that a high-end new energy vehicle intends to use MINILED backlight to serve as a central control screen at present, the utility model provides the following scheme that the central control screen comprises a backlight plate, a plurality of driving IC chips are arranged on the backlight plate, a plurality of lamp beads are connected to the plurality of driving IC chips, and the lamp beads are uniformly distributed on the backlight plate. Compared with a traditional side-in type vehicle-mounted screen, the contrast ratio of the MINILED direct-down type vehicle-mounted screen adopting the LD technology can reach 10 W to 1, the brightness easily breaks through 1000 nit, and compared with a traditional vehicle-mounted screen backlight of a PM vehicle-mounted driving framework, the power consumption of a vehicle-mounted driving screen driven by AM is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of display screen backlight, in particular to a vehicle-mounted MINI display screen LD backlight system. Background Art

[0002] With the development of society, many display screens are put into use in cars. The hollow platform of the car is set up. The MINI car screen is designed under the trend of more and more intelligent car market and more and larger in-car display screens. It is necessary to make the car screen high-brightness and high-contrast requirements.

[0003] The brightness of traditional LCD central control screens is generally low. When driving during the day, the brightness is obviously not enough, which affects the driver's driving navigation, etc. High-end new energy vehicles are currently intending to use MINILED backlights for central control screens. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the brightness of the traditional LCD central control screen is generally low. When driving during the day, it is obviously felt that the brightness is not enough, which affects the driver's driving navigation, etc. High-end new energy vehicles currently intend to use MINILED backlight as the central control screen, and a vehicle-mounted MINI display LD backlight system is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A vehicle-mounted MINI display screen LD backlight system comprises a backlight board, on which a plurality of driver IC chips are arranged, and each of the plurality of driver IC chips is connected with a plurality of lamp beads, which are evenly arranged on the backlight board.

[0007] Preferably, a plurality of the driver IC chips form an AM architecture, where AM refers to Active Matrix. The front-end TCON sends brightness data, the mid-end MCU parses the brightness data and converts the data into a dedicated protocol for the AM driver chip, and the terminal AM driver chip starts working after receiving the corresponding drive signal, outputting a dimming PWM waveform or a DC waveform to adjust the light-emitting mode of the lamp bead.

[0008] Preferably, one driver IC chip in the AM architecture controls 4-8 areas.

[0009] Preferably, a plurality of the driver IC chips are connected in series step by step.

[0010] Preferably, a transparent shell is provided on the top of the backlight panel, a plurality of elastic rods are fixedly mounted on the top of the backlight panel, trapezoidal blocks are fixedly mounted on the elastic rods, a plurality of mounting holes are opened on the transparent shell, and the trapezoidal blocks cooperate with the mounting holes.

[0011] In the utility model, the beneficial effects of the vehicle-mounted MINI display LD backlight system are:

[0012] Compared with the traditional side-entry car screen, the MINILED direct-type car screen using LD technology can achieve a contrast ratio of 10W:1, and the brightness can easily exceed 1000nit.

[0013] Compared with the traditional PM vehicle-mounted driving architecture vehicle-mounted screen backlight, the AM-driven vehicle-mounted driving screen has lower power consumption.

[0014] Compared with the traditional PM vehicle-mounted drive architecture vehicle-mounted screen backlight, the temperature rise of the LED driver chip driven by AM vehicle-mounted drive will be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : The average current timing of the AM-driven lamp beads in the utility model;

[0016] Figure 2 : The average current timing of the traditional PM-driven lamp beads;

[0017] Figure 3 :VF curve of a domestic MINILED lamp bead;

[0018] Figure 4 : Layout diagram of traditional PM lamp drive integrated board;

[0019] Figure 5 : Layout diagram of the AM lamp drive integrated board in the utility model;

[0020] Figure 6 : Multiple driver IC chips in the utility model are connected in series step by step;

[0021] Figure 7 : A structural diagram of a backlight panel, a plurality of driver IC chips, and a transparent shell in the second embodiment;

[0022] Figure 8 :In this embodiment 2 Figure 7 A magnified view of the structure of part A.

[0023] In the figure: 1. backlight panel; 2. driver IC chip; 3. transparent shell; 4. mounting hole; 5. elastic rod; 6. trapezoidal block; 7. positioning hole; 8. positioning rod. DETAILED DESCRIPTION

[0024] The technical solution of this embodiment will be clearly and completely described below in conjunction with the drawings in this embodiment. Obviously, the described embodiment is only a part of this embodiment, rather than all of the embodiments.

[0025] Embodiment 1

[0026] Reference Figure 1-Figure 6 A vehicle-mounted MINI display LD backlight system includes a backlight panel 1, on which a plurality of driver IC chips 2 are arranged, and each of the plurality of driver IC chips 2 is connected with a plurality of lamp beads, which are evenly arranged on the backlight panel 1, and the driver IC chip 2 is an AM small chip.

[0027] In this embodiment, a plurality of the driver IC chips 2 form an AM architecture, where AM refers to Active Matrix. The front-end TCON sends brightness data, the mid-end MCU analyzes the brightness data and converts the data into a dedicated protocol for the AM driver chip, and the terminal AM driver chip starts working after receiving the corresponding drive signal, outputting a dimming PWM waveform or a DC waveform to adjust the light-emitting mode of the lamp bead.

[0028] In this embodiment, one driver IC chip 2 in the AM architecture controls 4 to 8 areas.

[0029] In this embodiment, a plurality of the driver IC chips 2 are connected in series step by step.

[0030] In this embodiment, we assume that I=17.5mA corresponds to a voltage of 2.82V, and 4I equals 70mA, corresponding to a voltage of 3.08V.

[0031] Figure 1 :The power consumption of a single lamp bead is W=UIT, W=17.5*2.82T=49.35T;

[0032] Figure 2 :The power consumption of a single lamp bead W=U*4I*(T / 4)=3.08*70*(T / 4)=53.9T;

[0033] Therefore, the power consumption of AM is lower than that of PM under the same average current. The relatively low power consumption of vehicle backlight is more conducive to the environment of automotive electronics.

[0034] join Figure 4 : One PM architecture driver IC can control 384 partitions, so the corresponding IC temperature will be very high.

[0035] join Figure 5 :The driver IC of AM architecture controls 4 or 8 zones, and is evenly arranged on the light board, so the temperature rise is relatively good. The temperature inside the vehicle system will also be relatively good; The improvement of this case is: The driver IC of AM architecture controls 4 or 8 zones, and is evenly arranged on the light board, so the temperature rise is relatively good.

[0036] In this embodiment, currently mass-produced car manufacturers mainly use PM architecture backlight chips. The present utility model mainly uses AM backlight drive architecture.

[0037] In this embodiment, some car manufacturers such as Ideal, Changan, Cadillac, etc. have already used this technology, but they still use the four-scan or multi-scan backlight mode of the PM architecture. The main problem caused by this mode is that the IC is highly utilized. For example, if a 384-zone vehicle-mounted project only uses one, it is difficult to solve the problem of local temperature rise of one IC. Secondly, high-frequency refresh will also cause DCDC howling and EMI problems.

[0038] In this embodiment, AM small chips are used. The natural advantage of this chip is that it can be evenly distributed in different areas of the light board. And a small chip basically only has 4 or 8 partitions. The relative power consumption is very low. Therefore, the temperature rise of the entire backlight panel 1, including the IC inside, is very good. Secondly, AM does not need to consider the chip utilization problem, so a high refresh rate is not required. The DC dimming mode can also be used, and there is no concept of fast switching of MOS tubes. Therefore, DCDC howling and EMI problems can be solved. This solution can also reduce the power consumption of the entire backlight. In the PM driver chip mode, the backlight panel 1 has PMOS as a switch for scanning switching. Because this runs a large current, plus the internal resistance of the MOS tube itself, it will consume part of the power consumption. Secondly, the multi-scan solution is time-sharing multiplexing. Ensure that the average current of the lamp bead remains unchanged, but the time is shortened, so only the peak current can be pulled. According to the VF characteristics of the lamp bead, the voltage will be based on the voltage corresponding to the maximum current. Then the power consumption of the lamp bead at this time is relatively high compared to the power consumption under low current, so the power consumption of the entire backlight panel 1 using the PM architecture will be high. Because AM is directly driven, the voltage and current are highly matched per unit time, so the power consumption is lower.

[0039] In this embodiment, because the temperature is evenly distributed on the lamp board, the temperature rise of the chip will be much lower than the driving temperature rise of the PM. The power consumption is explained in detail in the first few pictures of my fourth point. One driver of the AM architecture has 4 or 8 areas, which are mainly evenly arranged on the lamp board in a cascade manner. The first chip receives the driving signal from the control board, and then the second driver chip receives the control signal from the first chip, and so on, until the last control chip sends the signal back to the MCU on the control board. A communication loop is achieved.

[0040] Embodiment 2

[0041] Reference Figure 7-Figure 8A vehicle-mounted MINI display LD backlight system includes a backlight panel 1, a plurality of driver IC chips 2 are arranged on the backlight panel 1, a plurality of lamp beads are connected to the plurality of driver IC chips 2, the lamp beads are evenly arranged on the backlight panel 1, the driver IC chips 2 are small AM chips, a transparent shell 3 is arranged on the top of the backlight panel 1, a plurality of elastic rods 5 are fixedly installed on the top of the backlight panel 1, a trapezoidal card block 6 is fixedly installed on the elastic rod 5, a plurality of mounting card holes 4 are opened on the transparent shell 3, and the trapezoidal card block 6 cooperates with the mounting card hole 4; the elastic rod 5 provides elasticity for the trapezoidal card block 6 so that the trapezoidal card block 6 is clamped with the mounting card hole 4, so that the transparent shell 3 can be easily disassembled and assembled.

[0042] In this embodiment, a plurality of positioning rods 8 are fixedly mounted on the bottom of the transparent shell 3 , a plurality of positioning holes 7 are opened on the backlight plate 1 , and the positioning rods 8 cooperate with the positioning holes 7 to prevent the transparent shell 3 from shifting during installation.

[0043] The above is only a preferred specific implementation of this embodiment, but the protection scope of this embodiment is not limited to this. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of this embodiment within the technical scope disclosed in this embodiment, which should be covered by the protection scope of this embodiment.

Claims

1. A vehicle-mounted MINI display screen LD backlight system, comprising a backlight panel (1), characterized in that: The backlight panel (1) is provided with a plurality of driver IC chips (2), each of the plurality of driver IC chips (2) is connected to a plurality of lamp beads, and the lamp beads are evenly arranged on the backlight panel (1); the plurality of driver IC chips (2) form an AM architecture; One driver IC chip (2) in the AM architecture controls 4 to 8 areas.

2. The vehicle-mounted MINI display screen LD backlight system according to claim 1, characterized in that: The driver IC chip (2) is an AM small chip.

3. The vehicle-mounted MINI display screen LD backlight system according to claim 1, characterized in that: A plurality of the driver IC chips (2) are connected in series step by step.

4. The vehicle-mounted MINI display LD backlight system according to claim 1, characterized in that: A transparent shell (3) is arranged on the top of the backlight panel (1), a plurality of elastic rods (5) are fixedly mounted on the top of the backlight panel (1), a trapezoidal card block (6) is fixedly mounted on the elastic rod (5), a plurality of mounting card holes (4) are opened on the transparent shell (3), and the trapezoidal card blocks (6) match the mounting card holes (4).

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