Backlight unit and display apparatus
By adding boost and buck modules to the backlight drive chip, VLED and internal power modules are provided for Mini-LED backlight design, the problem of wire waste in the prior art is solved and more efficient power utilization and circuit layout are achieved.
Patent Information
- Application Number
- CN202421957242.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-13
AI Technical Summary
In existing Mini-LED backlight designs, the backlight panel needs to consider at least two power supplies, resulting in waste of wire and connectors.
By adding a boost module and a buck module to the backlight driving chip, it is used to provide power to the light emitting unit with VLED and internal power module respectively, the traces on the backlight control board are reduced, and the power supply traces of the light emitting unit are arranged within the trace range of the backlight driving chip.
It effectively reduces the traces on the backlight control board, avoids the traces between the power supply traces of multiple light emitting units, and improves the layout efficiency of the circuit and the utilization rate of the power supply.
Smart Images
Figure CN223022877U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of displays, and in particular, to a backlight unit and a display device. Background Art
[0002] The Chinese full name of Mini-LED is "sub-millimeter light-emitting diode". Mini LED displays can be divided into Mini LED direct display and Mini LED backlight. Mini LED backlight control requires the cooperation of a backlight control chip and a backlight driver chip. Generally, one backlight control chip is required for each screen, and its function is similar to a "total control switch" for controlling the backlight source. The backlight driver chip can be divided into types such as single-channel, 4-channel, 8-channel, 16-channel, etc. One channel corresponds to one partition, and one partition can cover multiple LED lamp beads.
[0003] In the existing Mini-LED backlight design process, the power supply required for the backlight panel includes the forward operating voltage VLED of the LED and the voltage VDD (Virtual Device Driver) required by the Mini-LED driver chip. Among them, the VLED voltage is generated by the main power supply board of the whole machine and is directly input to the lamp board through a connector via the circuit board where the backlight control chip is located. The power supply board outputs 12V (usually 12V, and other voltages are not excluded) voltage to the circuit board where the backlight control chip is located, and is converted into 3.3V (usually 3.3V - 5V) by the DC-DC converter on the circuit board where the backlight control chip is located and then input to the lamp board through a connector. In the above lamp board design process, at least two power supplies, VLED and VDD, need to be considered. After VLED is generated by the power supply board, it reaches the lamp board via the circuit board where the backlight control chip is located. VLED only undergoes a connection conversion on the circuit board where the backlight control chip is located, and no electrical characteristic change adjustment is performed on the circuit board where the backlight control chip is located, which results in waste of wires and connectors. Summary of the Invention
[0004] The present application provides a backlight unit and a display device to solve the technical problem of wire waste existing in the prior art.
[0005] In a first aspect, the present application provides a backlight unit, characterized in that it includes a power supply board, a backlight control board, a backlight driver chip, and a light-emitting unit:
[0006] The power output terminal of the power supply board is connected to the power supply terminal of the backlight control board;
[0007] The power output terminal of the backlight control board is connected to the power supply terminal of the backlight driver chip;
[0008] The power supply terminal of the light-emitting unit is connected to the power output terminal of the backlight driver chip.
[0009] In one embodiment, the backlight driving chip includes a power supply port, a boost module, and a power output port;
[0010] The power supply port is connected to the power output terminal of the backlight control board; the input terminal of the boost module is connected to the power supply port, the output terminal of the boost module is connected to the power output port, and the power output port is connected to the power terminal of the light-emitting unit.
[0011] In one embodiment, the backlight driving chip further includes a buck module, the input terminal of the buck module is connected to the power supply port, and the output terminal of the buck module is connected to the internal power-consuming module.
[0012] In one embodiment, the backlight driving chip further includes an I / O port and a channel port, and the internal power-consuming module includes an I / O interface circuit, a digital logic circuit, and an analog driving circuit;
[0013] The power supply terminal of the I / O interface circuit, the power supply terminal of the digital logic circuit, and the power supply terminal of the analog driving circuit are all connected to the output terminal of the buck module;
[0014] The I / O port is connected to the input terminal of the I / O interface circuit, the output terminal of the I / O interface circuit is connected to the input terminal of the digital logic circuit, the output terminal of the digital logic circuit is connected to the input terminal of the analog driving circuit, the output terminal of the analog driving circuit is connected to the channel port, and the channel port is connected to the driving terminal of the light-emitting unit.
[0015] In one embodiment, both the power output port and the channel port of the backlight driving chip are provided with multiple ones, and the number of the power output ports on the backlight driving chip is associated with the channel ports of the backlight driving chip.
[0016] In one embodiment, the internal power-consuming module further includes a detection circuit and a control circuit;
[0017] The power supply terminal of the detection circuit and the power supply terminal of the control circuit are both connected to the output terminal of the buck module;
[0018] The input terminal of the detection circuit is connected to the output terminal of the analog driving circuit, the output terminal of the detection circuit is connected to the input terminal of the control circuit, and the output terminal of the control circuit is connected to the control terminal of the boost module;
[0019] The output terminal of the detection circuit outputs the voltages of each channel port, and the output terminal of the control circuit outputs an adjustment signal, and the adjustment signal is used to adjust the voltage of the power output port.
[0020] In one embodiment, the backlight control board includes a substrate and a backlight controller located on the substrate;
[0021] The power supply terminal of the backlight controller is connected to the power output terminal of the power supply board, and the power output terminal of the backlight controller is connected to the power supply terminal of the backlight driving chip;
[0022] The substrate is also provided with a ground wire. The ground wire terminal of the power supply board is connected to the grounding terminal of the backlight driving chip through the ground wire laid on the substrate.
[0023] In one embodiment, the backlight driving chip further includes a grounding port. The grounding port is connected to the ground wire on the substrate and is connected to the internal power-consuming module.
[0024] In one embodiment, the backlight unit includes a plurality of backlight driving chips, and the backlight unit further includes a connector; the power output terminal of the backlight control board is connected to the power supply terminal of each backlight driving chip through the connector, and the ground wire on the substrate is connected to the grounding terminal of each backlight driving chip through the connector.
[0025] In a second aspect, the present application provides a display device, which is characterized in that it includes a liquid crystal panel and a backlight unit as described in any one of the above embodiments.
[0026] The present application provides a backlight unit and a display device. The backlight unit includes a power supply board, a backlight control board, a backlight driving chip, and a light-emitting unit: the power output terminal of the power supply board is connected to the power supply terminal of the backlight control board; the power output terminal of the backlight control board is connected to the power supply terminal of the backlight driving chip; the power supply terminal of the light-emitting unit is connected to the power output terminal of the backlight driving chip. Compared with the prior art in which the output terminal of the backlight control board is connected to the power supply terminal of the light-emitting unit, in the present application, the power output terminal of the backlight driving chip is connected to the power supply terminal of the light-emitting unit, and the backlight driving chip provides voltage for the light-emitting unit, reducing the wiring on the backlight control board, and laying out the power supply wiring of the light-emitting unit within the wiring range of the backlight driving chip, avoiding the wiring avoidance between the power supply wirings of multiple light-emitting units. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.
[0028] Figure 1 is a schematic structural diagram of a backlight unit in the prior art;
[0029] Figure 2 is a schematic structural diagram of a backlight unit provided in one embodiment Figure 1 ;
[0030] Figure 3 is a schematic structural diagram of a backlight unit provided in one embodiment Figure 2 ;
[0031] Figure 4Schematic structure of a backlight unit provided in an embodiment Figure 3 ;
[0032] Figure 5 Schematic structure of a backlight unit provided in an embodiment Figure 4 ;
[0033] Figure 6 Schematic structure of a backlight unit provided in an embodiment Figure 5 ;
[0034] Figure 7 Schematic structure of a backlight unit provided in an embodiment Figure 6 。
[0035] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and more detailed descriptions will be given hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Description of Specific Embodiments
[0036] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.
[0037] In the drawings, the thicknesses of multiple layers and regions are shown in an enlarged manner to make them clear and easy to describe. When a layer, region, or plate is referred to as being "on" or "adjacent to" another layer, region, or plate, it can be directly on the other layer, region, or plate, or there may be intermediate layers, regions, or plates between them. On the contrary, when a layer, region, or plate is referred to as being "directly on" or "immediately adjacent to" another layer, region, or plate, there may be no intermediate layers, regions, or plates between them. In addition, when a layer, region, or plate is referred to as being "below" another layer, region, or plate, it can be "directly below" the other layer, region, or plate, or there may be intermediate layers, regions, or plates between them. On the contrary, when a layer, region, or plate is referred to as being "directly below" another layer, region, or plate, there may be no intermediate layers, regions, or plates between them.
[0038] For ease of description, in this document, spatial relative terms such as "below", "beneath", "underlying", "above", "overlying", etc. may be used to describe the relationship between one element or component and another as shown in the accompanying drawings. It will be understood that, in addition to the orientation illustrated in the drawings, the spatial relative terms are intended to encompass different orientations of the device during use or operation. For example, in the case where the device shown in the figure is flipped, a device located "below" or "beneath" another device may be placed "above" the other device. Thus, the exemplary term "below" can include both a lower position and an upper position. The device can also be oriented in another direction, and thus the spatial relative terms can be interpreted differently depending on the orientation.
[0039] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. Throughout the specification, when an element is referred to as being "connected" to another element, the element is "directly connected" to the other element or "electrically connected" to the other element with one or more intermediate elements interposed therebetween.
[0040] The terms used herein are for the purpose of describing particular embodiments only and are not limiting. As used herein, the singular form "a" is also intended to include the plural form, unless the context clearly indicates otherwise. It will be further understood that when used in this specification, the terms "comprises" and / or "comprising" 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. Expressions such as "at least one" before a list of elements modify the entire list of elements without modifying the individual elements of the list.
[0041] It should be understood that in the description of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.
[0042] As used herein, the terms "about," "substantially," "approximate," and similar terms include the stated value and mean within an acceptable deviation range for a particular value as determined by one of ordinary skill in the art, taking into account the measurements discussed and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the value. Additionally, when describing embodiments of the present application, the use of "may" refers to "one or more embodiments of the present disclosure." As used herein, the term "use" may be considered a synonym of the term "utilize" respectively.
[0043] An electronic or electrical device and / or any other related device or component according to an embodiment of the present application described herein, such as, for example, an external controller, a timing controller, a data driver, a scan driver, a grayscale voltage generator, a grayscale corrector, and a emission driver, may be implemented using any suitable hardware, firmware (e.g., an application specific integrated circuit), software, or a combination of software, firmware, and hardware known to one of ordinary skill in the art. For example, various components of these devices may be formed on one integrated circuit (IC) chip or on separate IC chips. Additionally, various components of these devices may be implemented on a flexible printed circuit film, a tape carrier package (TCP), a printed circuit board (PCB), or formed on a substrate. Furthermore, various components of these devices may be processes or threads running on one or more processors in one or more computing devices, executing computer program instructions and interacting with other system components to perform the various functions described herein. The computer program instructions are stored in a memory, which may be implemented using a standard memory device such as a random access memory (RAM) in a computing device. The computer program instructions may also be stored in other non-transitory computer-readable media, such as, for example, a CD-ROM or a flash drive, etc. Additionally, one of ordinary skill in the art should recognize that, without departing from the spirit and scope of the present application, the functionality of various computing / electronic devices may be combined or integrated into a single computing / electronic device, or the functionality of a particular computing / electronic device may be distributed over one or more computing / electronic devices.
[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted as having an ideal or overly formal meaning unless expressly defined in this specification.
[0045] The full Chinese name of Mini-LED is "sub-millimeter light-emitting diode". Mini LED displays can be divided into two types: Mini LED direct display and Mini LED backlight. Mini LED backlight control requires the cooperation of a backlight control chip and a backlight driver chip. Generally, one backlight control chip is needed for each screen, and its function is similar to a "main control switch" for controlling the backlight source. Backlight driver chips can be divided into types such as single-channel, 4-channel, 8-channel, and 16-channel. One channel corresponds to one zone, and one zone can cover multiple LED beads.
[0046] In the existing Mini-LED backlight design process, the power supply required for the backlight panel includes the forward operating voltage VLED of the LED and the voltage VDD (Virtual Device Driver) required by the Mini-LED driver chip. Among them, the VLED voltage is generated by the main power supply board of the whole machine and is directly input to the lamp board through a connector via the circuit board where the backlight control chip is located. The power supply board outputs 12V (usually 12V, but other voltages are not excluded) voltage to the circuit board where the backlight control chip is located, and is converted into 3.3V (usually 3.3V - 5V) by the DC-DC converter on the circuit board where the backlight control chip is located and then input to the lamp board through a connector. In the above lamp board design process, at least two power supplies, VLED and VDD, need to be considered. After VLED is generated by the power supply board, it reaches the lamp board via the circuit board where the backlight control chip is located. VLED only undergoes a connection conversion on the circuit board where the backlight control chip is located, and no electrical characteristic change adjustment is performed on the circuit board where the backlight control chip is located, which results in waste of wires and connectors.
[0047] In response to the above technical problems, as Figure 2 shown, the present application proposes a backlight unit 200, which is characterized by including a power supply board 201, a backlight control board 202, a backlight driver chip 203, and a light-emitting unit 204:
[0048] The power output terminal of the power supply board 201 is connected to the power supply terminal of the backlight control board 202;
[0049] The power output terminal of the backlight control board 202 is connected to the power supply terminal of the backlight driver chip 203;
[0050] The power supply terminal of the light-emitting unit 204 is connected to the power output terminal of the backlight driver chip 203.
[0051] The power supply board 201 is an important part of the display driver system, responsible for controlling the power supply aspect of the driving circuit, that is, the turning on and off of the switching tube, and boosting the voltage of the transformer when lighting to provide sufficient driving voltage, and maintaining the stability of the output current during the operation of the circuit. In the backlight unit 200 of the present application, the power supply board 201 provides voltage for the operation of the backlight control board 202, the backlight driving chip 203, and the light-emitting driving of the light-emitting unit 204. In the embodiment of the present application, the output end of the power supply board 201 is connected to the power supply end of the backlight control board 202.
[0052] After processing the voltage provided by the power supply board 201, the backlight control board 202 transmits the voltage from the power output end to the backlight driving chip 203. The backlight driving chip 203 operates under the drive of the voltage and drives the light emission of the light-emitting unit 204. Among them, the light-emitting unit 204 includes a plurality of light-emitting diodes (LEDs). The light emission of the LED requires a positive voltage VLED and a driving voltage VDD. In the present application, both the positive voltage VLED and the driving voltage VDD of the LED are provided by the backlight driving chip 203.
[0053] In the backlight unit provided in the above embodiment, the backlight unit includes a power supply board, a backlight control board, a backlight driving chip, and a light-emitting unit: the power output end of the power supply board is connected to the power supply end of the backlight control board; the power output end of the backlight control board is connected to the power supply end of the backlight driving chip; the power supply end of the light-emitting unit is connected to the power output end of the backlight driving chip. Compared with the prior art in which the output end of the backlight control board is connected to the power supply end of the light-emitting unit, in the present application, the power output end of the backlight driving chip is connected to the power supply end of the light-emitting unit, and the backlight driving chip provides voltage for the light-emitting unit, reducing the traces on the backlight control board, and arranging the power supply traces of the light-emitting unit within the trace range of the backlight driving chip, avoiding the trace avoidance between the power supply traces of multiple light-emitting units.
[0054] In one of the embodiments, as Figure 3 shown, the backlight driving chip 203 includes a power supply port 2031, a boosting module 2032, and a power output port 2033;
[0055] The power supply port 2031 is connected to the power output end of the backlight control board 202; the input end of the boosting module 2032 is connected to the power supply port 2031, the output end of the boosting module 2032 is connected to the power output port 2033, and the power output port 2033 is connected to the power end of the light-emitting unit 204.
[0056] Since the VLED is the power supply for LED lighting, the required current is usually very large (usually 13~60V), while the voltage supplied by the power board 201 to the backlight driver chip 203 through the backlight control board 202 is usually small (usually 3.3V - 5V). Therefore, a boost module 2032 is added to the backlight driver chip 203 to process the voltage through the boost module 2032 and output VLED that can ensure the normal operation of the light-emitting unit 204.
[0057] Specifically, the backlight driver chip 203 is connected to the power output terminal of the backlight control board 202 through the power supply port 2031 to obtain power; then, after being boosted by the boost module 2032, it provides VLED for the light-emitting unit 204 from the power output port 2033. The boost module 2032 can not only increase the voltage but also has functions such as filtering and voltage stabilization to provide a stable and appropriate voltage for the positive electrode of the light-emitting unit.
[0058] In one embodiment, the backlight driver chip 203 further includes a buck module 2034. The input end of the buck module 2034 is connected to the power supply port 2031, and the output end of the buck module 2034 is connected to the internal power consumption module 2035.
[0059] The backlight driver chip 203 is used to drive the light-emitting unit 204, and the internal power consumption module 2035 is the general term for other modules required for the internal implementation of the backlight driver chip to achieve driving. Usually, the working voltage required by the internal power consumption module 2035 is not large. Therefore, after processing the obtained power supply through the buck module 2034, it supplies power to the internal power consumption module 2035.
[0060] The internal power consumption module 2035 includes circuits or electronic components such as an oscillator OSC and undervoltage lockout UVLO required for the normal operation of the backlight driver chip.
[0061] In the backlight unit provided by the above embodiment, a buck module is added inside the backlight driver chip to meet the power consumption requirements of the internal power consumption module, so that all the power consumption of the backlight driver chip can be satisfied with only one input for the normal operation of the backlight driver chip. Wiring on the backlight driver chip can effectively reduce the jumper design between different backlight driver chips.
[0062] In one embodiment, as Figure 4 shown, the backlight driver chip 203 further includes an I / O port 2036 and a channel port 2037, and the internal power consumption module 2035 includes an I / O interface circuit 3501, a digital logic circuit 3502, and an analog drive circuit 3503;
[0063] The power supply terminals of the I / O interface circuit 3501, the power supply terminals of the digital logic circuit 3502, and the power supply terminals of the analog drive circuit 3503 are all connected to the output terminal of the buck module 2034;
[0064] The I / O port 2036 is connected to the input terminal of the I / O interface circuit 3501. The output terminal of the I / O interface circuit 3501 is connected to the input terminal of the digital logic circuit 3502. The output terminal of the digital logic circuit 3502 is connected to the input terminal of the analog drive circuit 3503. The output terminal of the analog drive circuit 3503 is connected to the channel port 2037, and the channel port 2037 is connected to the drive terminal of the light-emitting unit 204.
[0065] Among them, the I / O port 2036 is used for data transmission, and transmits the acquired data to the I / O interface circuit 3501. The data is processed by the digital logic circuit 3502 and the analog drive circuit 3503 in sequence, and the drive voltage is output to the channel port 2037. The channel port 2037 is connected to the drive terminal of the light-emitting unit 204. For example, if the light-emitting unit includes LED lamp beads, the channel port 2037 is connected to the negative electrode of the LED lamp bead to drive the LED to emit light.
[0066] In the backlight unit provided by the above embodiment, the drive data is acquired by the I / O port to drive the light-emitting unit. The buck module provides the working power supply for the drive circuit in the internal power-consuming module, ensuring the drive stability of the light-emitting unit. And due to the existence of the buck module, the drive is completed inside the backlight drive chip, reducing the wiring complexity between the circuits inside the backlight unit.
[0067] In one of the embodiments, there are multiple power output ports 2033 and multiple channel ports 2037 on the backlight drive chip 203. The number of the power output ports 2033 on the backlight drive chip is associated with the channel ports 2037 of the backlight drive chip.
[0068] The backlight drive chip 203 is used to drive the light-emitting unit 204 to emit light. The light-emitting unit 204 includes light-emitting devices, such as LED lamp beads. Usually, there are multiple light-emitting devices in one light-emitting unit 204, and the multiple light-emitting devices are grouped. There are multiple channel ports 2037 in the backlight drive chip 203. The output of each channel port 2037 is controlled by the output of the analog drive circuit 3503. Each channel port 2037 corresponds to a light-emitting partition, and one light-emitting partition can cover one group. As Figure 5 shown, the backlight drive chip 203 has 4 channel ports 2037, and each channel port 2037 is connected to the drive terminal of the light-emitting unit 204.
[0069] The power output port 2033 is connected to the power terminal of the light-emitting unit 204 and provides VLED for the light-emitting unit 204. The VLEDs of all groups of light-emitting devices in the light-emitting unit 204 can be the same or different. Therefore, multiple power output ports 2033 can be provided in the backlight driving chip 203. The number of power output ports 2033 can be set by comprehensively considering the volume of the backlight driving chip, the routing, and the number of channel ports. For example, when the number of channel ports 2037 is large and the required VLED is small, to reduce the volume of the driving IC, only the minimum number of power output ports 2033 that meet the driving requirements can be retained. When the number of channel ports 2037 is small and the required VLED is large, the number of power output ports 2033 can be appropriately increased as an alternative.
[0070] In the backlight unit provided by the above embodiment, when setting the number of power output ports, the volume of the backlight driving chip, the routing, and the number of channel ports are comprehensively considered.
[0071] In one embodiment, as Figure 6 shown, the internal power consumption module 2035 further includes a detection circuit 3504 and a control circuit 3505;
[0072] The power supply terminal of the detection circuit 3504 and the power supply terminal of the control circuit are both connected to the output terminal of the buck module 2034;
[0073] The input terminal of the detection circuit 3504 is connected to the output terminal of the analog driving circuit 3503, the output terminal of the detection circuit 3504 is connected to the input terminal of the control circuit 3505, and the output terminal of the control circuit 3505 is connected to the control terminal of the boost module 2302;
[0074] The output terminal of the detection circuit 3504 outputs the voltage of each channel port 2037, and the output terminal of the control circuit 3505 outputs an adjustment signal, and the adjustment signal is used to adjust the voltage of the power output port 2033.
[0075] The detection circuit 3504 and the control circuit 3505 are used to detect the voltage output by the analog driving circuit 3503 to each channel port 2037, and adjust the VLED output by the power output port 2033 based on this voltage. Specifically, the detection circuit 3504 can monitor the voltage of the output pin of the backlight driving chip 203 (i.e., the channel port 2037) in real time, and adjust the output voltage of the power output port 2033 on the premise of ensuring the stable output current of the analog driving circuit, so as to ensure that the output voltage is at the minimum value that can work normally.
[0076] In the backlight unit provided by the above embodiments, through the detection circuit and the control circuit, combined with the driving voltage of each light-emitting unit, the VLED of the light-emitting unit is accurately controlled, and the power consumption can be effectively reduced while ensuring the normal light emission of the light-emitting unit.
[0077] In one embodiment, the backlight control board includes a substrate and a backlight controller located on the substrate;
[0078] The power supply terminal of the backlight controller is connected to the power output terminal of the power supply board, and the power output terminal of the backlight controller is connected to the power supply terminal of the backlight driving chip;
[0079] The substrate is also provided with a ground wire, and the ground wire terminal of the power supply board is connected to the ground terminal of the backlight driving chip through the ground wire laid on the substrate.
[0080] The power supply board is connected to the ground terminal of the backlight controller and the ground terminal of the backlight driving chip through the ground wire laid on the substrate, without other wiring and processing devices, saving the area of the backlight control board.
[0081] In one embodiment, the backlight driving chip 203 further includes a ground port, the ground port is connected to the ground wire on the substrate, and the ground port is connected to the internal power consumption module 2035.
[0082] The ground voltage is obtained for the internal power consumption module through the ground port, improving the safety of the backlight driving chip.
[0083] In one embodiment, as Figure 7 shown, the backlight unit includes a plurality of backlight driving chips 203, and the backlight unit further includes a connector 205; the power output terminal of the backlight control board 202 is connected to the power supply terminal of each backlight driving chip 203 through the connector 205, and the ground wire on the substrate is connected to the ground terminal of each backlight driving chip 203 through the connector 205.
[0084] In Figure 7 , the connector 205 is a device with few inputs and many outputs. The connector 205 divides the driving data data, driving voltage, and GND output by the backlight control board 202 into multiple paths, providing data data, driving power supply, and GND for a plurality of backlight driving chips 203 to drive the light-emitting units 204 connected to each backlight driving chip 203 to emit light.
[0085] In the backlight unit provided by the above embodiments, the driving data and driving voltage are provided for a plurality of backlight driving chips through the connector.
[0086] Combined with the backlight unit provided by the above embodiments, the present application further provides a display device, and the display device includes a liquid crystal panel and the backlight unit as described in any one of the above embodiments.
Claims
1. A backlight unit, characterized in that: Including power board, backlight control board, backlight driver chip and light-emitting unit: The power output terminal of the power board is connected to the power supply terminal of the backlight control board; The power output terminal of the backlight control board is connected to the power supply terminal of the backlight driving chip; The power supply end of the light emitting unit is connected to the power output end of the backlight driving chip.
2. The backlight unit according to claim 1, characterized in that: The backlight driving chip includes a power supply port, a boost module and a power output port; The power supply port is connected to the power output end of the backlight control panel; the input end of the boost module is connected to the power supply port, the output end of the boost module is connected to the power output port, and the power output port is connected to the power end of the light-emitting unit.
3. The backlight unit according to claim 2, characterized in that: The backlight driving chip further comprises a step-down module, an input end of the step-down module is connected to the power supply port, and an output end of the step-down module is connected to an internal power module.
4. The backlight unit according to claim 3, characterized in that: The backlight driver chip further includes an I / O port and a channel port, and the internal power module includes an I / O interface circuit, a digital logic circuit and an analog drive circuit; The power supply end of the I / O interface circuit, the power supply end of the digital logic circuit and the power supply end of the analog drive circuit are all connected to the output end of the step-down module; The I / O port is connected to the input end of the I / O interface circuit, the output end of the I / O interface circuit is connected to the input end of the digital logic circuit, the output end of the digital logic circuit is connected to the input end of the analog drive circuit, the output end of the analog drive circuit is connected to the channel port, and the channel port is connected to the drive end of the light-emitting unit.
5. The backlight unit according to claim 4, characterized in that: The backlight driver chip is provided with a plurality of power output ports and channel ports, and the number of the power output ports on the backlight driver chip is associated with the channel ports of the backlight driver chip.
6. The backlight unit according to claim 4, characterized in that: The internal power consumption module also includes a detection circuit and a control circuit; The power supply end of the detection circuit and the power supply end of the control circuit are both connected to the output end of the step-down module; The input end of the detection circuit is connected to the output end of the analog drive circuit, the output end of the detection circuit is connected to the input end of the control circuit, and the output end of the control circuit is connected to the control end of the boost module; The output end of the detection circuit outputs the voltage of each channel port, and the output end of the control circuit outputs an adjustment signal, and the adjustment signal is used to adjust the voltage of the power output port.
7. The backlight unit according to any one of claims 1 to 6, characterized in that: The backlight control panel comprises a substrate and a backlight controller located on the substrate; The power supply end of the backlight controller is connected to the power output end of the power board, and the power output end of the backlight controller is connected to the power supply end of the backlight driving chip; A ground wire is also provided on the substrate, and the ground wire end of the power board is connected to the ground end of the backlight driving chip through the ground wire laid on the substrate.
8. The backlight unit according to claim 7, characterized in that: The backlight driving chip further comprises a grounding port, the grounding port is connected to a grounding line on the substrate, and the grounding port is connected to an internal power module.
9. The backlight unit according to claim 7, characterized in that: The backlight unit includes multiple backlight driver chips, and the backlight unit also includes a connector; the power output end of the backlight control board is connected to the power supply end of each backlight driver chip through the connector, and the ground wire on the substrate is connected to the ground end of each backlight driver chip through the connector.
10. A display device, characterized in that: The invention comprises a liquid crystal panel and the backlight unit as claimed in any one of claims 1 to 9.