TWM658154U - Improved light emitting diode backlight module - Google Patents

Abstract

An improved LED backlight module comprises a printed circuit, a positive-end LED circuit having a positive-end printed resistor circuit, a negative-end LED circuit having a negative-end printed resistor circuit, and a middle LED. The first electrical connection path of the middle light-emitting diode connected to the 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 the positive end light-emitting diode circuit connected to the 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 the 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 the negative end light-emitting diode circuit connected to the negative end of the power supply circuit via the printed circuit and the negative end of the power supply.

Description

Improved LED backlight module

The present disclosure relates to a light emitting diode backlight module, in particular to an improved light emitting diode backlight module.

The LED backlight module has a wide range of applications. For example, it can be placed in a keyboard to make the keyboard a light-emitting keyboard.

The LED backlight module includes many LEDs; however, due to the 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 the distance from the positive terminal (or negative terminal) of the power source increases. Therefore, the farther the LED is from the positive terminal (or negative terminal) of the power source, 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 terminal (or negative terminal) of the power source, the lower the brightness is, causing the LED backlight module to not light up evenly.

For example, in a related art 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.

To solve the above problems, the present disclosure aims to provide an improved LED backlight module.

In order to achieve the above-mentioned purpose of the present disclosure, the improved LED backlight module disclosed in the present disclosure 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, and the improved LED backlight module includes: a printed circuit; at least one positive LED circuit, including a positive LED and a positive printed resistor circuit, wherein the positive LED and the positive printed resistor circuit are electrically connected to the printed circuit; at least one negative LED circuit, including a negative LED and a negative printed resistor circuit, wherein the negative LED and the negative printed resistor circuit are electrically connected to the printed circuit. ; and an intermediate light-emitting diode, which is 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.

Furthermore, in a specific embodiment of the improved LED backlight module disclosed above, 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 is electrically connected to the power supply circuit via the positive power terminal. The negative end main line circuit is electrically connected to the at least one negative end branch line circuit and is electrically connected to the power supply circuit via the negative end of the power supply. The positive end light emitting diode, the positive end printed resistor circuit, the negative end light emitting diode, the negative end printed resistor circuit and the middle light emitting diode are electrically connected to the at least one positive end branch line circuit and the at least one negative end branch line circuit.

Furthermore, in one specific embodiment of the improved LED backlight module disclosed above, the positive-end LED 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.

Furthermore, in one specific embodiment of the improved LED backlight module disclosed above, the negative-end LED 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.

Furthermore, in one specific embodiment of the improved LED backlight module disclosed above, the middle LED is electrically connected between the at least one positive branch circuit and the at least one negative branch circuit.

Furthermore, in a specific embodiment of the improved LED backlight module disclosed above, the middle LED is connected to the positive end of 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 in sequence, and the first electrical connection path is longer than the first electrical connection path of the at least one positive end LED 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 in sequence. The second electrical connection path of the positive end of the power supply circuit; the first electrical connection path of the middle light-emitting diode connected to the negative end of the power supply circuit via the at least one negative end branch circuit, the negative end main line circuit and the negative end of the power supply in sequence 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 negative end of the power supply circuit via the at least one negative end branch circuit, the negative end main line circuit and the negative end of the power supply in sequence.

Furthermore, in a specific embodiment of the improved LED backlight module disclosed above, the printed circuit, the positive-end printed resistor circuit and the negative-end printed resistor circuit are conductive ink material printed circuits.

Furthermore, in one specific embodiment of the improved LED backlight module disclosed above, the printed circuit, the positive-end printed resistor circuit and the negative-end printed resistor circuit are copper foil printed circuits.

Furthermore, in one specific embodiment of the improved LED backlight module disclosed above, the shape of the positive-end printed resistor circuit and the negative-end printed resistor circuit is a continuous straight line bending shape.

Furthermore, in one specific embodiment of the improved LED backlight module disclosed above, the positive-end printed resistor circuit and the negative-end printed resistor circuit are in a continuous curved shape.

The effect of the present disclosure is to make the LED backlight module illuminate evenly.

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.

In this disclosure, many specific details are provided to provide a comprehensive understanding of the embodiments of the present disclosure; however, those skilled in the art will appreciate that the present disclosure can be practiced without one or more of these specific details; in other cases, well-known details are not shown or described to avoid obscuring the features of the present disclosure. The technical content and detailed description of the present disclosure are as follows, and are illustrated with the attached figures.

Please refer to FIG. 1, which is a circuit block diagram of the improved LED backlight module 10 disclosed in the present invention. The improved LED backlight module 10 disclosed in the present invention 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-end light-emitting diode circuit 106 includes a negative-end light-emitting diode 1061 and a negative-end printed resistor circuit 1062; The printed circuit 102 includes a positive-end main line circuit 1021, a negative-end main line circuit 1022, at least one positive-end branch line circuit 1023 (for example, a plurality of positive-end branch line circuits 1023) and at least one negative-end branch line circuit 1024 (for example, a plurality of negative-end branch line circuits 1024); The above-mentioned components are electrically connected to each other.

The improved LED backlight module 10 is applied to a power supply device 20 . The power supply device 20 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 .

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

A positive first electrical connection path PL1 of the middle LED 108 connected to the power supply circuit 22 via the at least one positive branch circuit 1023, the positive main circuit 1021 and the positive power terminal 24 in sequence is longer than a positive second electrical connection path PL2 of the at least one positive LED circuit 104 connected to the power supply circuit 22 via the at least one positive branch circuit 1023, the positive main circuit 1021 and the positive power terminal 24 in sequence; that is, the at least one positive LED circuit 104 is closer to the positive power terminal 24 than the middle LED 108.

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

Therefore, similar to the LED backlight module of the related art, if the positive-end printed resistor circuit 1042 and the negative-end printed resistor circuit 1062 disclosed in the present invention are not provided (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 LED 1041 in series with the positive-end printed resistor circuit 1042, and connects the negative-end LED 1061 in series with the negative-end printed resistor circuit 1062; the present disclosure consumes some voltage drop through the positive-end printed resistor circuit 1042 and the negative-end printed resistor circuit 1062, so that the voltages and currents of the positive-end LED 1041, the negative-end LED 1061, and the middle LED 108 are equal, thereby making the brightness of the positive-end LED 1041, the negative-end LED 1061, and the middle LED 108 the same and the improved LED backlight module 10 can illuminate evenly.

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 made of any material, and preferably printed circuits made of conductive ink materials with higher line resistance.

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 disclosed in 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 disclosed in the present invention; in Figures 2 and 3, the shapes of the positive-end printed resistor circuit 1042 and the negative-end printed resistor circuit 1062 are continuous straight line bend shapes, and the two end points in the figure correspond to the two end points of the positive-end printed resistor circuit 1042 (and the negative-end printed resistor circuit 1062) in Figure 1 respectively.

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 disclosed in the present invention; in Figure 4, the shapes of the positive-end printed resistor circuit 1042 and the negative-end printed resistor circuit 1062 are continuous curved shapes, and the two end points in the figure correspond to the two end points of the positive-end printed resistor circuit 1042 (and the negative-end printed resistor circuit 1062) in Figure 1 respectively.

However, the shapes of the positive-end printed resistor circuit 1042 and the negative-end printed resistor circuit 1062 are not limited to those shown in FIGS. 2 , 3 and 4 , that is, the shapes of the positive-end printed resistor circuit 1042 and the negative-end printed resistor circuit 1062 can be any shapes; 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 resistor element (for example, a surface mount chip resistor).

The effect of the present disclosure is to make the LED backlight module illuminate evenly.

Although the present disclosure has been described with reference to the embodiments of the present disclosure, it should be understood that the present disclosure is not limited to its details; various substitutions and modifications have been proposed in the foregoing description, and a person skilled in the art will think of other substitutions and modifications; therefore, all such substitutions and modifications are intended to be included in the scope of the present disclosure.

10: Improved LED backlight module 20: Power supply device 22: Power supply circuit 24: Positive power supply terminal 26: Negative power supply terminal 102: Printed circuit 104: Positive LED circuit 106: Negative LED circuit 108: Intermediate LED 1021: Positive main line circuit 1022: Negative main line circuit 1023: Positive branch line circuit 1024: Negative branch line circuit 1041: Positive LED 1042: Positive printed resistor circuit 1061: Negative LED 1062: Negative printed resistor circuit NL1: Negative end first electrical connection path NL2: Negative end second electrical connection path PL1: Positive end first electrical connection path PL2: Positive end second electrical connection path

FIG. 1 is a circuit block diagram of the improved LED backlight module disclosed in the present invention.

FIG. 2 is a diagram showing a first embodiment of the shapes of the positive-end printed resistor circuit and the negative-end printed resistor circuit of the present disclosure.

FIG. 3 is a diagram showing a second embodiment of the shapes of the positive-end printed resistor circuit and the negative-end printed resistor circuit of the present disclosure.

FIG. 4 is a diagram of a third embodiment of the shapes of the positive-end printed resistor circuit and the negative-end printed resistor circuit of the present disclosure.

10: Improved LED backlight module

20: Power supply device

22: Power supply circuit

24: Positive power terminal

26: Negative power terminal

102: Printed circuit

104: Positive-end LED circuit

106: Negative LED circuit

108: Middle light-emitting diode

1021: Positive main line circuit

1022: Negative main line circuit

1023: Positive branch circuit

1024: Negative branch circuit

1041: Positive-end light-emitting diode

1042: Positive end printed resistor circuit

1061: Negative light-emitting diode

1062: Negative printed resistor circuit

NL1: Negative end first electrical connection path

NL2: Negative end second electrical connection path

PL1: Positive end first electrical connection path

PL2: Positive end second electrical connection path

Claims (10)

An improved LED backlight module 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, and the improved LED backlight module includes: A printed circuit; At least one positive LED circuit, including a positive LED and a positive printed resistor circuit, wherein the positive LED and the positive printed resistor circuit are electrically connected to the printed circuit; At least one negative LED circuit, including a negative LED and a negative printed resistor circuit, wherein the negative LED and the negative printed resistor circuit are electrically connected to the printed circuit; and A middle light-emitting diode is electrically connected to the printed circuit, wherein the first electrical connection path of the middle light-emitting diode connected to a positive end of the power supply circuit sequentially through the printed circuit and the positive end of the power supply is longer than the 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 sequentially through 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 sequentially through the printed circuit and the negative end of the power supply is longer than the 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 sequentially through the printed circuit and the negative end of the power supply. An improved LED backlight module as described in claim 1, wherein the printed circuit includes a positive main circuit, a negative main circuit, at least one positive branch circuit and at least one negative branch circuit, the positive main circuit is electrically connected to the at least one positive branch circuit and electrically connected to the power supply circuit via the positive end of the power supply, the negative main circuit is electrically connected to the at least one negative branch circuit and electrically connected to the power supply circuit via the negative end of the power supply, the positive LED, the positive printed resistor circuit, the negative LED, the negative printed resistor circuit and the intermediate LED are electrically connected to the at least one positive branch circuit and the at least one negative branch circuit. An improved LED backlight module as described in claim 2, wherein the positive-end LED 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. An improved LED backlight module as described in claim 3, wherein the negative-end LED 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. An improved LED backlight module as described in claim 4, wherein the middle LED is electrically connected between the at least one positive branch circuit and the at least one negative branch circuit. The improved LED backlight module as described in claim 5, wherein the first electrical connection path of the positive end of the middle LED 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 source is longer than the first electrical connection path of the at least one positive end LED 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 source. The positive end second electrical connection path; the negative end first electrical connection path of the middle 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 in sequence is longer than the negative end second electrical connection path 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 in sequence. An improved LED backlight module as described in claim 6, wherein the printed circuit, the positive-end printed resistor circuit and the negative-end printed resistor circuit are printed circuits made of conductive ink materials. An improved LED backlight module as described in claim 6, wherein the printed circuit, the positive-end printed resistor circuit and the negative-end printed resistor circuit are copper foil printed circuits. The improved LED backlight module as described in claim 1, wherein the shape of the positive end printed resistor circuit and the negative end printed resistor circuit is a continuous straight line bend shape. The improved LED backlight module as described in claim 1, wherein the shape of the positive-end printed resistor circuit and the negative-end printed resistor circuit is a continuous curved shape.

Images