Improved light emitting diode backlight module

Abstract

The utility model discloses an improved light-emitting diode backlight module, which comprises a printed circuit, a positive end light-emitting diode circuit with a positive end printed resistance circuit, a negative end light-emitting diode circuit with a negative end printed resistance circuit, and a middle light-emitting diode. The middle light emitting diode is connected to a positive end first electrical connection path of the power supply circuit through the printed circuit and the power supply positive end in sequence, and is longer than a positive end second electrical connection path of the power supply circuit through the printed circuit and the power supply positive end in sequence; the middle light emitting diode is connected to a negative end first electrical connection path of the power supply circuit through the printed circuit and the power supply negative end in sequence, and is longer than a negative end second electrical connection path of the power supply circuit through the printed circuit and the power supply negative end in sequence.

Description

Technical Field

[0001] The utility model relates to a light emitting diode backlight module, and in particular to an improved light emitting diode backlight module. Background Art

[0002] The light emitting diode backlight module has a wide range of applications. For example, it can be arranged in a keyboard to make the keyboard an illuminating keyboard.

[0003] The LED backlight module includes many LEDs; however, due to the wasted voltage drop caused by the line resistance of the printed circuit of the LED backlight module, the voltage of the LEDs connected in parallel will be lower as they are farther away from the positive end (or negative end) of the power supply. Therefore, the farther the LED is from the positive end (or negative end) of the power supply, the smaller the current is. The current of the LED affects the brightness of the LED, so that the farther the LED is from the positive end (or negative end) of the power supply, the lower the brightness is, causing the LED backlight module to be unable to illuminate evenly.

[0004] For example, in a conventional LED backlight module, the LEDs on both sides are closer to the positive power terminal (or negative power terminal) than the LED in the middle, so the LEDs on both sides are brighter than the LED in the middle. Utility Model Content

[0005] In order to solve the above problems, the purpose of the present invention is to provide an improved light emitting diode backlight module.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model provides an improved light-emitting diode backlight module, which is applied to a power supply device, the power supply device includes a power supply circuit, a positive power terminal and a negative power terminal, the improved light-emitting diode backlight module includes: a printed circuit; at least one positive-end light-emitting diode circuit, including a positive-end light-emitting diode and a positive-end printed resistor circuit, wherein the positive-end light-emitting diode and the positive-end printed resistor circuit are electrically connected to the printed circuit; at least one negative-end light-emitting diode circuit, including a negative-end light-emitting diode and a negative-end printed resistor circuit, wherein the negative-end light-emitting diode and the negative-end printed resistor circuit are electrically connected to the printed circuit. A printed circuit; and an intermediate light-emitting diode electrically connected to the printed circuit, wherein a first electrical connection path of the intermediate light-emitting diode connected to a positive end of the power supply circuit via the printed circuit and the positive end of the power supply is longer than a second electrical connection path of the at least one positive-end light-emitting diode circuit connected to a positive end of the power supply circuit via the printed circuit and the positive end of the power supply; and a first electrical connection path of the intermediate light-emitting diode connected to a negative end of the power supply circuit via the printed circuit and the negative end of the power supply is longer than a second electrical connection path of the at least one negative-end light-emitting diode circuit connected to a negative end of the power supply circuit via the printed circuit and the negative end of the power supply.

[0007] Preferably, the printed circuit includes a positive main line circuit, a negative main line circuit, at least one positive branch line circuit and at least one negative branch line circuit, the positive main line circuit is electrically connected to the at least one positive branch line circuit and electrically connected to the power supply circuit via the positive end of the power supply, the negative main line circuit is electrically connected to the at least one negative branch line circuit and electrically connected to the power supply circuit via the negative end of the power supply, the positive light-emitting diode, the positive printed resistor circuit, the negative light-emitting diode, the negative printed resistor circuit and the intermediate light-emitting diode are electrically connected to the at least one positive branch line circuit and the at least one negative branch line circuit.

[0008] Preferably, the positive-end light-emitting diode and the positive-end printed resistor circuit are connected in series with each other and are electrically connected between the at least one positive-end branch circuit and the at least one negative-end branch circuit.

[0009] Preferably, the negative-end light-emitting diode and the negative-end printed resistor circuit are connected in series with each other and are electrically connected between the at least one positive-end branch circuit and the at least one negative-end branch circuit.

[0010] Preferably, the middle light emitting diode is electrically connected between the at least one positive branch circuit and the at least one negative branch circuit.

[0011] Preferably, the first electrical connection path of the positive end of the intermediate light-emitting diode connected to the power supply circuit via the at least one positive-end branch circuit, the positive-end main circuit and the positive end of the power supply is longer than the second electrical connection path of the positive end of the at least one positive-end light-emitting diode circuit connected to the power supply circuit via the at least one positive-end branch circuit, the positive-end main circuit and the positive end of the power supply; the first electrical connection path of the negative end of the intermediate light-emitting diode connected to the power supply circuit via the at least one negative-end branch circuit, the negative-end main circuit and the negative end of the power supply is longer than the second electrical connection path of the negative end of the at least one negative-end light-emitting diode circuit connected to the power supply circuit via the at least one negative-end branch circuit, the negative-end main circuit and the negative end of the power supply.

[0012] Preferably, the printed circuit, the positive-end printed resistor circuit and the negative-end printed resistor circuit are printed circuits made of conductive ink material.

[0013] Preferably, the printed circuit, the positive end printed resistance circuit and the negative end printed resistance circuit are copper foil printed circuits.

[0014] Preferably, the positive-end printed resistance circuit and the negative-end printed resistance circuit are in a continuous straight-line bending shape.

[0015] Preferably, the positive-end printed resistance circuit and the negative-end printed resistance circuit are in a continuous curved shape.

[0016] The utility model has the effect of making the light emitting diode backlight module illuminate evenly.

[0017] In order to further understand the technology, method and effect of the present disclosure and achieve the intended purpose of the present disclosure, please refer to the following detailed description and drawings; in addition, the purpose, characteristics and features of the present disclosure can be understood more deeply and specifically; however, the drawings are provided for reference and description only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other purpose features and advantages of the utility model will become clearer through the specific description of the preferred embodiments of the utility model shown in the accompanying drawings. The same reference numerals indicate the same parts in all the accompanying drawings, and the drawings are not deliberately scaled to the actual size, and the focus is on illustrating the main purpose of the utility model.

[0019] Figure 1 This is a circuit block diagram of the improved light emitting diode backlight module of the utility model.

[0020] Figure 2 It is a diagram of a first embodiment of the shape of a positive-end printed resistor circuit and a negative-end printed resistor circuit of the utility model.

[0021] Figure 3 It is a diagram of a second embodiment of the shape of the positive-end printed resistor circuit and the negative-end printed resistor circuit of the utility model.

[0022] Figure 4 It is a diagram of a third embodiment of the shape of the positive-end printed resistor circuit and the negative-end printed resistor circuit of the utility model.

[0023] Reference numerals:

[0024] 10: Improved LED backlight module

[0025] 20: Power supply device

[0026] 22: Power supply circuit

[0027] 24: Positive power terminal

[0028] 26: Negative terminal of power supply

[0029] 102: Printed Circuit

[0030] 104: Positive end light emitting diode circuit

[0031] 106: Negative LED circuit

[0032] 108: Middle LED

[0033] 1021: Positive main line circuit

[0034] 1022: Negative main line circuit

[0035] 1023: Positive branch circuit

[0036] 1024: Negative branch circuit

[0037] 1041: Positive LED

[0038] 1042: Positive end printed resistor circuit

[0039] 1061: Negative LED

[0040] 1062: Negative end printed resistor circuit

[0041] NL1: Negative terminal first electrical connection path

[0042] NL2: Negative terminal second electrical connection path

[0043] PL1: positive terminal first electrical connection path

[0044] PL2: Positive end second electrical connection path DETAILED DESCRIPTION

[0045] In this specification, many specific details are provided to provide a thorough understanding of the specific embodiments of the utility model; however, those skilled in the art should know that the purpose of the utility model can still be achieved without one or more of these specific details; in other cases, well-known details are not shown or described to avoid blurring the main technical features of the utility model. The detailed description and technical content of the utility model are described as follows with the accompanying drawings, but the attached drawings are only provided for reference and explanation, and are not used to limit the utility model.

[0046] Please refer to Figure 1 , which is a circuit block diagram of the improved light emitting diode backlight module 10 of the present invention. The improved LED backlight module 10 of the utility model comprises a printed circuit 102, at least one positive LED circuit 104 (e.g., a plurality of positive LED circuits 104), at least one negative LED circuit 106 (e.g., a plurality of negative LED circuits 106) and an intermediate LED 108; the at least one positive LED circuit 104 comprises a positive LED 1041 and a positive printed resistor circuit 1042; the at least one negative LED circuit 106 comprises a negative LED 1061 and a negative printed resistor circuit 1062; the printed circuit 102 comprises a positive main line circuit 1021, a negative main line circuit 1022, at least one positive branch line circuit 1023 (e.g., at least two positive branch line circuits 1023) and at least one negative branch line circuit 1024 (e.g., at least two negative branch line circuits 1024); the above-mentioned components are electrically connected to each other.

[0047] The improved LED backlight module 10 is applied to a power supply device 20 , which includes a power supply circuit 22 , a positive power terminal 24 and a negative power terminal 26 . The power supply circuit 22 supplies power to the improved LED backlight module 10 via the positive power terminal 24 and the negative power terminal 26 .

[0048] The positive end main line circuit 1021 is electrically connected to the power supply circuit 22 via the positive power supply terminal 24, and the negative end main line circuit 1022 is electrically connected to the power supply circuit 22 via the negative power supply terminal 26. The positive end light emitting diode 1041 and the positive end printed resistor circuit 1042 are connected in series with each other and are electrically connected between the at least one positive end branch circuit 1023 and the at least one negative end branch circuit 1024, and the positive end printed resistor circuit 1042 can be disposed at the anode or cathode of the positive end light emitting diode 1041. The negative end light emitting diode 1061 and the negative end printed resistor circuit 1062 are connected in series with each other and are electrically connected between the at least one positive end branch circuit 1023 and the at least one negative end branch circuit 1024, and the negative end printed resistor circuit 1062 can be disposed at the anode or cathode of the negative end light emitting diode 1061. The middle light emitting diode 108 is electrically connected between the at least one positive branch circuit 1023 and the at least one negative branch circuit 1024 .

[0049] The first electrical connection path PL1 of the middle light-emitting diode 108 connected to a positive end of the power supply circuit 22 via the at least one positive-end branch circuit 1023, the positive-end main circuit 1021 and the positive power terminal 24 is longer than the second electrical connection path PL2 of the at least one positive-end light-emitting diode circuit 104 connected to a positive end of the power supply circuit 22 via the at least one positive-end branch circuit 1023, the positive-end main circuit 1021 and the positive power terminal 24; that is, the at least one positive-end light-emitting diode circuit 104 is closer to the positive power terminal 24 than the middle light-emitting diode 108.

[0050] The first electrical connection path NL1 of the middle light-emitting diode 108 connected to a negative end of the power supply circuit 22 via the at least one negative-end branch circuit 1024, the negative-end main circuit 1022 and the negative power supply terminal 26 in sequence is longer than the second electrical connection path NL2 of the at least one negative-end light-emitting diode circuit 106 connected to a negative end of the power supply circuit 22 via the at least one negative-end branch circuit 1024, the negative-end main circuit 1022 and the negative power supply terminal 26 in sequence; that is, the at least one negative-end light-emitting diode circuit 106 is closer to the negative power supply terminal 26 than the middle light-emitting diode 108.

[0051] Therefore, similar to the LED backlight module of the related art, if the positive-end printed resistance circuit 1042 and the negative-end printed resistance circuit 1062 disclosed in the present invention are not present (that is, if the positive-end LED 1041 and the negative-end LED 1061 are directly connected between the at least one positive-end branch circuit 1023 and the at least one negative-end branch circuit 1024), the positive-end LED 1041 and the negative-end LED 1061 will be brighter than the middle LED 108. The present disclosure connects the positive-end light-emitting diode 1041 in series with the positive-end printed resistance circuit 1042, and connects the negative-end light-emitting diode 1061 in series with the negative-end printed resistance circuit 1062; the present disclosure consumes some voltage drop through the positive-end printed resistance circuit 1042 and the negative-end printed resistance circuit 1062, so that the voltages and currents of the positive-end light-emitting diode 1041, the negative-end light-emitting diode 1061 and the middle light-emitting diode 108 are equal, thereby making the brightness of the positive-end light-emitting diode 1041, the negative-end light-emitting diode 1061 and the middle light-emitting diode 108 the same and the improved light-emitting diode backlight module 10 can illuminate evenly.

[0052] The printed circuit 102 , the positive end printed resistor circuit 1042 and the negative end printed resistor circuit 1062 are printed circuits made of conductive ink materials, copper foil printed circuits or printed circuits of any material, and printed circuits made of conductive ink materials with higher line resistance are preferred.

[0053] Please refer to Figure 2 , which is a diagram of a first embodiment of the shape of the positive end printed resistor circuit 1042 and the negative end printed resistor circuit 1062 of the present invention; please refer to Figure 3 , which is a diagram of a second embodiment of the shape of the positive end printed resistor circuit 1042 and the negative end printed resistor circuit 1062 of the present invention; Figure 2 and Figure 3 In the figure, the positive end printed resistor circuit 1042 and the negative end printed resistor circuit 1062 are in the shape of continuous straight line bending shapes, and the two end points in the figure correspond to Figure 1 The two ends of the positive end printed resistor circuit 1042 (and the negative end printed resistor circuit 1062).

[0054] Please refer to Figure 4 , which is a diagram of a third embodiment of the shape of the positive end printed resistor circuit 1042 and the negative end printed resistor circuit 1062 of the present invention; Figure 4 In the figure, the positive end printed resistor circuit 1042 and the negative end printed resistor circuit 1062 are in a continuous curved shape, and the two end points in the figure correspond to Figure 1 The two ends of the positive end printed resistor circuit 1042 (and the negative end printed resistor circuit 1062).

[0055] However, the shapes of the positive end printed resistor circuit 1042 and the negative end printed resistor circuit 1062 are not limited to Figure 2 , Figure 3 and Figure 4 As shown, the shape of the positive-end printed resistor circuit 1042 and the negative-end printed resistor circuit 1062 can be any shape; the positive-end printed resistor circuit 1042 and the negative-end printed resistor circuit 1062 increase the resistance value (for example, increase 20 ohms to 30 ohms) by increasing the line length and reducing the line width to replace the actual resistance element (for example, surface mount chip resistor).

[0056] The utility model has the effect of making the light emitting diode backlight module illuminate evenly.

[0057] However, the above is only a preferred embodiment of the utility model, and it cannot limit the scope of implementation of the utility model. That is, all equivalent changes and modifications made according to the claims of the utility model should still fall within the scope of the patent coverage of the utility model and are intended to be protected. The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The utility model can also have many other embodiments. Without departing from the spirit and essence of the utility model, technicians familiar with the field can make various corresponding changes and deformations according to the utility model, but these corresponding changes and deformations should fall within the scope of protection of the claims of the utility model.

Claims

1. An improved light emitting diode backlight module, applied to a power supply device, the power supply device comprising a power supply circuit, a positive power terminal and a negative power terminal, characterized in that: The improved light emitting diode backlight module comprises: a printed circuit; At least one positive-end light-emitting diode circuit, comprising a positive-end light-emitting diode and a positive-end printed resistor circuit, wherein the positive-end light-emitting diode and the positive-end printed resistor circuit are electrically connected to the printed circuit; At least one negative-end light-emitting diode circuit, comprising a negative-end light-emitting diode and a negative-end printed resistor circuit, wherein the negative-end light-emitting diode and the negative-end printed resistor circuit are electrically connected to the printed circuit; and a middle light emitting diode electrically connected to the printed circuit, Among them, the first electrical connection path of the middle light-emitting diode connected to a positive end of the power supply circuit via the printed circuit and the positive end of the power supply is longer than the second electrical connection path of at least one positive-end light-emitting diode circuit connected to a positive end of the power supply circuit via the printed circuit and the positive end of the power supply; the first electrical connection path of the middle light-emitting diode connected to a negative end of the power supply circuit via the printed circuit and the negative end of the power supply is longer than the second electrical connection path of at least one negative-end light-emitting diode circuit connected to a negative end of the power supply circuit via the printed circuit and the negative end of the power supply.

2. The improved light emitting diode backlight module according to claim 1, wherein: in, The printed circuit includes a positive main line circuit, a negative main line circuit, at least one positive branch line circuit and at least one negative branch line circuit. The positive main line circuit is electrically connected to at least one of the positive branch line circuits and is electrically connected to the power supply circuit via the positive end of the power supply. The negative main line circuit is electrically connected to at least one of the negative branch line circuits and is electrically connected to the power supply circuit via the negative end of the power supply. The positive light-emitting diode, the positive printed resistor circuit, the negative light-emitting diode, the negative printed resistor circuit and the intermediate light-emitting diode are electrically connected to at least one of the positive branch line circuits and at least one of the negative branch line circuits.

3. The improved light emitting diode backlight module as claimed in claim 2, characterized in that: in, The positive-end light-emitting diode and the positive-end printed resistor circuit are connected in series with each other and are electrically connected between at least one of the positive-end branch circuits and at least one of the negative-end branch circuits.

4. The improved light emitting diode backlight module as claimed in claim 3, characterized in that: in, The negative-end light-emitting diode and the negative-end printed resistance circuit are connected in series with each other and are electrically connected between at least one of the positive-end branch circuits and at least one of the negative-end branch circuits.

5. The improved light emitting diode backlight module as claimed in claim 4, characterized in that: in, The middle light emitting diode is electrically connected between at least one of the positive branch circuits and at least one of the negative branch circuits.

6. The improved light emitting diode backlight module as claimed in claim 5, characterized in that: in, The first electrical connection path of the positive end of the intermediate light-emitting diode connected to the power supply circuit via at least one positive branch circuit, the positive main circuit and the positive end of the power supply is longer than the second electrical connection path of the positive end of the intermediate light-emitting diode connected to the power supply circuit via at least one positive branch circuit, the positive main circuit and the positive end of the power supply; the first electrical connection path of the negative end of the intermediate light-emitting diode connected to the power supply circuit via at least one negative branch circuit, the negative main circuit and the negative end of the power supply is longer than the second electrical connection path of the negative end of the intermediate light-emitting diode connected to the power supply circuit via at least one negative branch circuit, the negative main circuit and the negative end of the power supply.

7. The improved light emitting diode backlight module as claimed in claim 6, characterized in that: in, The printed circuit, the positive end printed resistance circuit and the negative end printed resistance circuit are printed circuits made of conductive ink material.

8. The improved light emitting diode backlight module as claimed in claim 6, characterized in that: in, The printed circuit, the positive end printed resistance circuit and the negative end printed resistance circuit are copper foil printed circuits.

9. The improved light emitting diode backlight module as claimed in claim 1, characterized in that: in, The positive-end printed resistance circuit and the negative-end printed resistance circuit are in the shape of continuous straight-line bending shapes.

10. The improved light emitting diode backlight module as claimed in claim 1, characterized in that: in, The positive-end printed resistance circuit and the negative-end printed resistance circuit are in a continuous curved shape.

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