A backlight strip adapter board, a backlight module and a method

Abstract

This invention discloses a backlight strip adapter board, a backlight module, and a method, comprising: an adapter board body, including a first adapter surface and a second adapter surface opposite to the first adapter surface; the first adapter surface having a first adapter interface corresponding one-to-one with the number and position of the light strips; and the second adapter surface having a second adapter interface connected to a backlight driver board; and an adapter circuit disposed within the adapter board body, connecting the first and second adapter interfaces, and having a plurality of filter capacitors respectively connected to the light strips. This invention, through the adapter board body, enables the first adapter interface to be connected one-to-one with the number and position of the light strips, and connects the second adapter interface to the backlight driver board, further reducing costs and simplifying the manufacturing process. Furthermore, by setting a plurality of filter capacitors respectively connected to the light strips to form a capacitor-inductor filter circuit, it further improves the current spikes of the light strip driving current and prevents current spikes from damaging the light strips.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a backlight strip adapter board, a backlight module, and a method. Background Technology

[0002] Currently, in multi-zone backlight display modules, connecting cables are needed to connect the LED strips and the driver board. However, the more LED strip zones a backlight display module has, the more connecting cables are required, increasing costs and complicating the manufacturing process. Furthermore, in large-size models, the excessive length of the LED strip connecting cables leads to significant line resistance and equivalent inductance, causing current spikes in the LED strip's drive current and potentially damaging the LED strip.

[0003] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a backlight strip adapter board, a backlight module and a method to solve the problems of multiple connection lines and increased cost of backlight display modules, as well as the problem of current spikes in the driving current of the light strip.

[0005] The technical solution of the present invention is as follows:

[0006] A backlight strip adapter board includes:

[0007] The adapter board body includes a first adapter surface and a second adapter surface opposite to the first adapter surface. The first adapter surface is provided with a first adapter interface that corresponds one-to-one with the number and position of the light strips. The second adapter surface is provided with a second adapter interface that connects to the backlight driver board.

[0008] The adapter circuit is located inside the adapter board, connecting the first adapter interface and the second adapter interface, and is provided with a number of filter capacitors that are connected to the light strips one by one.

[0009] In a further embodiment of the present invention, the positive and negative terminals of the light strip are provided with direct-plug pins that are connected to the first adapter interface.

[0010] In a further embodiment of the present invention, the connection end of the first adapter and the light strip adopts a common anode connection method.

[0011] In a further embodiment of the present invention, one end of the filter capacitor is connected to the anode of the light strip, and the other end of the filter capacitor is grounded.

[0012] In a further embodiment of the present invention, the second adapter is connected to the backlight driver board via a flexible flat cable.

[0013] A backlight module, the backlight module comprising at least one backlight strip adapter board as described above, a plurality of light strips connected to the first adapter interface, and a backlight driver board connected to the second adapter interface.

[0014] In a further embodiment of the present invention, the backlight driver board includes a switching transistor and a control module;

[0015] The switching transistor is connected to the control module and the light strip respectively, and is used to conduct according to the control frequency of the control module.

[0016] In a further embodiment of the present invention, the switching transistor is a field-effect transistor.

[0017] A method for suppressing peak current in a backlight strip, applied to the backlight strip adapter board described above, the method comprising:

[0018] Measure the high-frequency current period and the plateau current period of the light strip;

[0019] The capacitance value of the filter capacitor is calculated based on the high-frequency current period and the plateau current period.

[0020] Several filter capacitors are configured and connected to the light strips one by one.

[0021] In a further embodiment of the present invention, the current period of the switching circuit in which the filter capacitor is located is less than the platform current period but greater than the high-frequency current period.

[0022] This invention provides a backlight strip adapter board, comprising: an adapter board body, including a first adapter surface and a second adapter surface opposite to the first adapter surface; the first adapter surface has a first adapter interface corresponding to the number and position of the light strips; the second adapter surface has a second adapter interface connected to a backlight driver board; and an adapter circuit disposed within the adapter board body, connecting the first and second adapter interfaces, and having a plurality of filter capacitors respectively connected to the light strips. This invention, through the adapter board body, enables the first adapter interface to be connected to the number and position of the light strips, and the second adapter interface to be connected to the backlight driver board, thereby eliminating the need for excessive connecting wires between the light strips and the backlight driver board. Only one connecting wire is needed to connect to the backlight driver board through the second adapter interface, further reducing costs and simplifying the manufacturing process. Furthermore, by having a plurality of filter capacitors inside the adapter board respectively connected to the light strips to form a capacitor-inductor filter circuit, this invention further improves the current spikes of the light strip drive current and prevents current spikes from damaging the light strips. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a structural diagram of the backlight module in this invention.

[0025] Figure 2 This is a circuit diagram of the backlight module in this invention.

[0026] Figure 3 This is a current waveform diagram of a lamp strip without a filter circuit in the existing technology.

[0027] Figure 4 This is a waveform diagram of the lamp strip current with the filter circuit added in this invention.

[0028] Figure 5 This is a flowchart of the method for suppressing peak current of backlight strips in this invention.

[0029] The markings in the attached diagram are as follows: 100, backlight strip adapter board; 200, light strip; 300, connecting wire; 400, backlight driver board; 110, first adapter interface; 120, second adapter interface; 210, through-hole pin; C, filter capacitor; P1, control terminal; T, switching transistor. Detailed Implementation

[0030] This invention provides a backlight strip adapter board, a backlight module, and a method. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0031] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of the present invention involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0032] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0033] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0034] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0035] Please also refer to Figure 1 The present invention provides a preferred embodiment of a backlight strip adapter plate.

[0036] like Figure 1 As shown, the present invention provides a backlight strip adapter board 100, comprising: an adapter board body, including a first adapter surface and a second adapter surface opposite to the first adapter surface, the first adapter surface having a first adapter interface 110 corresponding one-to-one with the number and position of the light strips 200, the second adapter surface having a second adapter interface 120 connected to the backlight driver board 400; and an adapter circuit disposed in the adapter board body, connecting the first adapter interface 110 and the second adapter interface 120, and having a plurality of filter capacitors C respectively connected one-to-one with the light strips 200.

[0037] Specifically, the first adapter surface has a plurality of first adapter interfaces 110 corresponding one-to-one with the number and position of the light strips 200 to establish a connection with the light strips 200. Furthermore, a second adapter interface 120 is provided on the second adapter surface opposite the first adapter surface to connect with the backlight driver board 400. An adapter circuit is provided inside the adapter board body to connect the first adapter interface 110 and the second adapter interface 120. By setting up a backlight light strip adapter board 100 to connect multiple light strips 200 to the backlight driver board 400, it is unnecessary to set up too many connecting wires 300 to connect the light strips 200 and the backlight driver board 400. Only one connecting wire 300 is needed to connect the second adapter interface 120 to the backlight driver board 400, further reducing costs and simplifying the process.

[0038] Inside the adapter plate, several filter capacitors C are provided, each connected to a corresponding LED strip 200. Since the connecting line 300 is equivalent to an inductor, the presence of several filter capacitors C inside the adapter plate, each connected to a corresponding LED strip 200, forms a capacitor-inductor filter circuit. The capacitors and inductors form a low-pass filter to improve the current spikes in the driving current of the LED strip 200 and prevent current spikes from damaging the LED strip 200.

[0039] It should be noted that the value of the filter capacitor C is related to the equivalent inductance of the connecting line 300 and the PWM modulation frequency. The specific value will vary depending on the size of the machine (the length of the connecting line 300) and the modulation frequency of the backlight driver board 400. The length of the connecting line 300 determines the inductance value of its equivalent inductance. For example, as... Figure 3 as well as Figure 4 As shown, the inductance of the connecting wire 300 is measured to be L using an inductance tester, and the high-frequency current period T1 and the plateau current period T2 of the LED strip 200 are measured using an oscilloscope. The high-frequency current period T1 is the period of the current spike of the driving current, and the plateau current period T2 is the driving current period required for the LED strip 200. The current period of the transition circuit where the filter capacitor is located is made smaller than the plateau current period and larger than the high-frequency current period. Furthermore, the filter capacitor is adjusted according to the frequency formula. This is so that the filter capacitor C can filter out peak current.

[0040] In one embodiment, the positive and negative terminals of the light strip 200 are provided with through-hole pins 210 that are connected to the first adapter 110.

[0041] Specifically, such as Figure 1As shown, each partition of the light strip 200 has a direct-plug pin 210 on its positive and negative terminals, and the first adapter 110 has a direct-plug female socket that is compatible with the direct-plug pin 210. The light strip 200 is connected to the first adapter 110 through the direct-plug pin 210, thereby improving the efficiency of wiring and further reducing the number of connecting wires 300 to reduce costs.

[0042] In one embodiment, the first adapter 110 and the connection end of the light strip 200 adopt a common anode connection method.

[0043] Specifically, such as Figure 1 as well as Figure 2 As shown, the light strip 200 is composed of a number of light-emitting diodes. The light strips 200 in the same section are connected by a common anode, and the common anode terminal of the light strip 200 is connected to the first adapter 110. By adopting a common anode connection method, the number of anode connection points of the light strip 200 is reduced, thereby further simplifying the circuit connection and simplifying the process flow.

[0044] In one embodiment, one end of the filter capacitor C is connected to the anode of the light strip 200, and the other end of the filter capacitor C is grounded.

[0045] Specifically, such as Figure 1 as well as Figure 2 As shown, the filter capacitor C is located at the first adapter 110 corresponding to the light strip 200. One end of the filter capacitor C is connected to the anode of the light strip 200, and the other end is grounded. It should be noted that the closer the filter capacitor C is to the light strip 200, the better the filtering effect. However, if the filter capacitor C is located at the backlight driver board 400, i.e., at the connection point between the second adapter 120 and the backlight driver board 400, the filter capacitor C has no filtering effect on the light strip 200. Since the filter capacitor C mainly eliminates the peak current of the light strip 200, if the filter capacitor C is located at the backlight driver board 400, the connection line 300 between it and the light strip 200 will be longer, and therefore, the filtering effect of the filter capacitor C will be worse.

[0046] In one embodiment, the second adapter 120 is connected to the backlight driver board 400 via a flexible flat cable.

[0047] Specifically, the second adapter 120 is equipped with a flexible flat cable connector adapted to the flexible flat cable. The second adapter 120 is connected to the flexible flat cable through the flexible flat cable connector. Similarly, the backlight driver board is equipped with a flexible flat cable connector adapted to the flexible flat cable. The backlight driver board 400 is connected to the flexible flat cable through the flexible flat cable connector, so that the second adapter 120 is connected to the backlight driver board 400. By setting the backlight strip adapter board 100, only one connecting line 300 is needed to establish a connection between the light strip 200 and the backlight driver board, further reducing production costs and simplifying the process.

[0048] The present invention also provides a backlight module, the backlight module including the backlight strip adapter board 100 as described above, a plurality of light strips 200 connected to the first adapter interface 110, and a control board connected to the second adapter interface 120.

[0049] Since the backlight module provided by the present invention includes the backlight strip adapter board 100 of the above-mentioned technical solution, the backlight module provided by the present invention has all the beneficial effects of the backlight strip adapter board 100, which will not be elaborated here.

[0050] like Figure 2 As shown, the light strips 200 in different zones are arranged in parallel, and the number of light-emitting diodes in each light strip 200 in each zone is not limited. Multiple first adapter interfaces 110 are provided on the first adapter surface of the adapter board, and each first adapter interface 110 corresponds one-to-one with a light strip 200 in each zone. The routing of the light strips 200 is adjusted by the adapter circuit inside the adapter board so that the routing of the light strips 200 leads out from the second adapter interface 120, and the second adapter interface 120 is connected to the backlight driver board 400.

[0051] In one embodiment, the backlight driver board 400 includes a switching transistor T and a control module; the switching transistor T is connected to the control module and the light strip 200 respectively, and is used to turn on according to the control frequency of the control module.

[0052] Specifically, such as Figure 2As shown, the switching transistor T is a field-effect transistor (FET). The gate of the switching transistor T is connected to the output terminal P1 of the control module, the source of the switching transistor T is grounded, and the drain of the switching transistor T is connected to the lamp strip 200. A pulse of a specified frequency is output from the output terminal P1 to control the switching frequency of the switching transistor T, thereby controlling the current of the lamp strip 200. It should be noted that different pulse duty cycles result in different conduction times for the switching transistor T, and consequently, different currents in the lamp strip 200 connected to the switching transistor T. Each section of the lamp strip 200 corresponds one-to-one with the backlight driver board 400. By setting different control frequencies for each backlight driver board 400, different lamp strips 200 in each section can receive different currents, thus enabling the lamp strips 200 to flash in various ways.

[0053] It should be noted that since the connecting line 300 is equivalent to an inductor, and the current across the equivalent inductor cannot change abruptly, if the duty cycles of the LED strips 200 in some zones are inconsistent, and the switching transistor T with the smaller duty cycle turns off faster than the one with the larger duty cycle, the current in the LED strips 200 of the already turned-off zones will surge into the LED strips 200 of the remaining zones that are still on, causing current spikes in the LED strips 200 of the on-state zones, which can damage the LED strips 200. Therefore, by providing several filter capacitors C connected one-to-one with the LED strips 200, the current spikes in the LED strips 200 are filtered out, thereby preventing the LED strips 200 from being damaged due to current spikes.

[0054] The present invention also provides a method for suppressing peak current of backlight strip 200, comprising:

[0055] S100, Measure the high-frequency current period T1 and the platform current period T2 of the light strip 200.

[0056] Specifically, the high-frequency current period T1 is the current peak of the light strip 200, and the plateau period T2 is the current required for normal operation of the light strip 200. Figure 3 As shown, before the filter capacitor C was added, the current spike of the light strip 200 was measured to be 386mA using an oscilloscope.

[0057] S200. Calculate the capacitance value of the filter capacitor C based on the high-frequency current period T1 and the platform current period T2.

[0058] Specifically, if it is necessary to filter out the current spikes of the light strip 200, the current period of the transition circuit where the filter capacitor C is located needs to be less than the plateau current period and greater than the high-frequency current period. That is, the modulation period of the light strip 200 should be less than the plateau current period T2 and greater than the high-frequency current period T1. According to the frequency formula... , so that the filter capacitor .

[0059] S300: Several filter capacitors C are respectively connected to the light strip 200 one-to-one. By further providing several filter capacitors C inside the adapter plate, each connected to the light strip 200, a capacitor-inductor filter circuit is formed. The capacitors and inductors form a low-pass filter to improve the current spikes in the driving current of the light strip 200 and prevent current spikes from damaging the light strip 200. Figure 4 As shown, after adding a filter capacitor, the peak current drops to 296mA. This is specifically illustrated in an embodiment of a backlight strip adapter board, and will not be repeated here.

[0060] In summary, the backlight strip adapter board provided by the present invention includes: an adapter board body, comprising a first adapter surface and a second adapter surface opposite to the first adapter surface, the first adapter surface having a first adapter interface corresponding one-to-one with the number and position of the light strips, and the second adapter surface having a second adapter interface connected to a backlight driver board; and an adapter circuit disposed within the adapter board body, connecting the first adapter interface and the second adapter interface, and having a plurality of filter capacitors respectively connected to the light strips one-to-one. The present invention, through the adapter board body, enables the first adapter interface to be connected one-to-one with the number and position of the light strips, and enables the second adapter interface to be connected to the backlight driver board, thereby eliminating the need for excessive connecting wires between the light strips and the backlight driver board. Only one connecting wire is needed to connect to the backlight driver board through the second adapter interface, further reducing costs and simplifying the manufacturing process. Furthermore, the present invention, by having a plurality of filter capacitors inside the adapter board respectively connected to the light strips one-to-one, forms a capacitor-inductor filter circuit, further improving the current spikes of the light strip driving current and preventing current spikes from damaging the light strips.

[0061] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A backlight strip adapter board, characterized in that, The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface.

2. The backlight strip adapter plate of claim 1, wherein, The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface.

3. The backlight strip adapter plate of claim 1, wherein, The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface.

4. A backlight module, characterized in that, The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface.

5. The backlight module of claim 4, wherein, The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface.

6. The backlight module of claim 5, wherein, The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface.

7. A method for suppressing the peak current of a backlight bar, applied to the backlight bar adapter of any one of claims 1 to 3, characterized in that, The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface.

8. The method of claim 7, wherein the method further comprises: The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip adapter plate according to any one of claims 1 to 3, a plurality of lamp strips connected with the first adapter interface, and a backlight drive plate connected with the second adapter interface. The backlight module comprises at least one backlight lamp strip

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