Light emitting diode backlight module
By designing a printed circuit with phased or continuous function variation in the light emitting diode backlight module, the problem of uneven brightness of the light emitting diode backlight module is solved, and the uniform brightness of the light emitting diode backlight module is achieved.
Patent Information
- Application Number
- CN202420997614.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The light emitting diode backlight module is wasted due to the wire resistance of the printed circuit, resulting in the smaller the current of the light emitting diodes that are farther away from the power supply, the lower the brightness, and cannot shine evenly.
A printed circuit is designed in which the shapes of the positive and negative branch circuits show a phased or continuous function variation in width, and are vertically connected to the main circuit, so that the resistance is evenly distributed, so that the voltage and current of all light-emitting diodes are voltage and current. Even, ensuring consistency in brightness.
By adjusting the shape and width of the circuit, the uniform brightness of the light emitting diode backlight module is achieved, avoiding the problem of the light emitting diode farther away from the power supply in the prior art.
Smart Images
Figure CN222283532U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a backlight module, in particular to a 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 parallel LEDs will decrease as they are farther away from the positive terminal (or negative terminal) of the power supply. Therefore, the farther the LED is from the positive terminal (or negative terminal) 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 terminal (or negative terminal) 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 a light emitting diode backlight module.
[0006] In order to achieve the above-mentioned purpose of the utility model, the light-emitting diode backlight module provided by the utility model comprises: a printed circuit, comprising a positive end main line circuit, a negative end main line circuit, at least one positive end branch line circuit and at least one negative end branch line circuit, wherein the at least one positive end branch line circuit comprises a positive connection end portion and a positive end portion, the positive connection end portion is electrically connected to the positive end portion and is wider than the positive end portion, the positive connection end portion is electrically connected to the positive end main line circuit, the at least one negative end branch line circuit comprises a negative connection end portion and a negative end portion, the negative connection end portion is electrically connected to the negative end portion and is wider than the negative end portion, the negative connection end portion electrically connected to the negative terminal main line circuit; at least one positive terminal light emitting diode electrically connected between the at least one positive terminal branch circuit and the at least one negative terminal branch circuit; at least one negative terminal light emitting diode electrically connected between the at least one positive terminal branch circuit and the at least one negative terminal branch circuit; and an intermediate light emitting diode electrically connected between the at least one positive terminal branch circuit and the at least one negative terminal branch circuit, wherein the at least one positive terminal light emitting diode is closer to the positive connection end and the negative terminal portion than the intermediate light emitting diode, and the at least one negative terminal light emitting diode is closer to the negative connection end and the positive terminal portion than the intermediate light emitting diode.
[0007] Preferably, the shape of the at least one positive-end branch circuit presents a phased change in width.
[0008] Preferably, the shape of the at least one negative-end branch circuit presents a phased change in width.
[0009] Preferably, the at least one positive-end branch circuit is in the shape of a trapezoid or a triangle.
[0010] Preferably, the at least one negative branch circuit is in the shape of a trapezoid or a triangle.
[0011] Preferably, the shape of the at least one positive-end branch circuit presents a continuous function change in width.
[0012] Preferably, the shape of the at least one negative-end branch circuit presents a continuous function change in width.
[0013] Preferably, the at least one positive-end branch circuit is vertically connected to the positive-end main circuit, and the at least one negative-end branch circuit is vertically connected to the negative-end main circuit.
[0014] Preferably, the printed circuit is a conductive ink material printed circuit.
[0015] Preferably, the printed circuit is a copper foil printed circuit.
[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 invention and achieve the intended purpose of the present invention, please refer to the following detailed description and drawings; in addition, the purpose, characteristics and features of the present invention can be understood more deeply and specifically; however, the drawings are provided only for reference and description and are not intended to limit the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The above and other purposes, features and advantages of the present invention will become more apparent through the detailed description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals in all the accompanying drawings indicate the same parts, and the drawings are not deliberately scaled to the actual size, but the focus is on illustrating the subject matter of the present invention.
[0019] Figure 1 This is a circuit block diagram of the first embodiment of the light emitting diode backlight module of the present invention.
[0020] Figure 2 It is a circuit block diagram of the second embodiment of the light emitting diode backlight module of the utility model.
[0021] Figure 3It is a circuit block diagram of the third embodiment of the light emitting diode backlight module of the utility model.
[0022] Figure 4 The figure is a schematic diagram of calculating the resistance value of a light emitting diode backlight module according to an embodiment of the prior art.
[0023] Figure 5 It is a schematic diagram of an embodiment of calculating the resistance value of the light emitting diode backlight module of the present invention.
[0024] Reference numerals:
[0025] 10: LED backlight module
[0026] 20: Power supply device
[0027] 22: Power supply circuit
[0028] 24: Positive power terminal
[0029] 26: Negative terminal of power supply
[0030] 102: Printed Circuit
[0031] 104: Positive end light emitting diode
[0032] 106: Negative light emitting diode
[0033] 108: Middle LED
[0034] 1021: Positive main line circuit
[0035] 1022: Negative main line circuit
[0036] 1023: Positive branch circuit
[0037] 1024: Negative branch circuit
[0038] 10231: Positive connection end
[0039] 10232: Positive end part
[0040] 10241: Negative connection end
[0041] 10242: Negative terminal
[0042] N1: Negative terminal first zone
[0043] N2: Negative terminal second zone
[0044] N3: Negative terminal third zone
[0045] N4: Negative terminal fourth zone
[0046] N5: Negative terminal fifth zone
[0047] P1: positive end first region
[0048] P2: positive end second region
[0049] P3: positive end third region
[0050] P4: positive end fourth zone
[0051] P5: positive end fifth zone DETAILED DESCRIPTION
[0052] 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.
[0053] Please refer to Figure 1 , which is a circuit block diagram of the first embodiment of the light emitting diode backlight module 10 of the present invention. The light-emitting diode backlight module 10 of the present invention comprises a printed circuit 102, at least one positive-end light-emitting diode 104 (e.g., a plurality of positive-end light-emitting diodes 104), at least one negative-end light-emitting diode 106 (e.g., a plurality of negative-end light-emitting diodes 106) and an intermediate light-emitting diode 108; the printed circuit 102 comprises a positive-end main line circuit 1021, a negative-end main line circuit 1022, at least one positive-end branch line circuit 1023 (e.g., a plurality of positive-end branch line circuits 1023) and at least one negative-end branch line circuit 1024 (e.g., a plurality of negative-end branch line circuits 1024); the at least one positive-end branch line circuit 1023 comprises a positive connection end 10231 and a positive terminal portion 10232, and the at least one negative-end branch line circuit 1024 comprises a negative connection end 10241 and a negative terminal portion 10242; the above-mentioned components are electrically connected to each other.
[0054] The at least one positive LED 104, the at least one negative LED 106, and the middle LED 108 are electrically connected between the at least one positive branch circuit 1023 and the at least one negative branch circuit 1024. The at least one positive branch circuit 1023 is vertically connected to the positive main circuit 1021, and the at least one negative branch circuit 1024 is vertically connected to the negative main circuit 1022. The at least one positive LED 104 is closer to the positive connection end 10231 and the negative terminal portion 10242 than the middle LED 108, and the at least one negative LED 106 is closer to the negative connection end 10241 and the positive terminal portion 10232 than the middle LED 108.
[0055] The positive connection end 10231 is wider than the positive terminal 10232; the negative connection end 10241 is wider than the negative terminal 10242. The shapes of the at least one positive branch circuit 1023 and the at least one negative branch circuit 1024 present a staged change in width (also called a step-like change). The printed circuit 102 is a conductive ink material printed circuit, a copper foil printed circuit or a printed circuit of any material, and a conductive ink material printed circuit with a higher line resistance is preferred.
[0056] The 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 LED backlight module 10 via the positive power terminal 24 and the negative power terminal 26 .
[0057] Similar to the LED backlight module of the prior art, if the shape of the at least one positive branch circuit 1023 and the at least one negative branch circuit 1024 is a straight rectangle, the at least one positive LED 104 and the at least one negative LED 106 will be brighter than the middle LED 108. The utility model changes the shape of the at least one positive end branch circuit 1023 and the at least one negative end branch circuit 1024, so that the resistance near the positive connection end 10231 and the negative connection end 10241 is smaller than the resistance near the positive end portion 10232 and the negative end portion 10242 (the wider the width, the smaller the resistance), so that the voltage of the at least one positive end light emitting diode 104, the at least one negative end light emitting diode 106 and the middle light emitting diode 108 are equal (to be described in detail later) and the current is equal, so that the brightness of the at least one positive end light emitting diode 104, the at least one negative end light emitting diode 106 and the middle light emitting diode 108 is the same and the light emitting diode backlight module 10 can be evenly illuminated.
[0058] Please refer to Figure 2, which is a circuit block diagram of a second embodiment of the light emitting diode backlight module 10 of the present utility model; Figure 2 The components shown are Figure 1 For the sake of simplicity, the same components are not repeated here. Figure 2 As shown, the shape of the at least one positive branch circuit 1023 and the at least one negative branch circuit 1024 is a trapezoid (or a triangle, also called continuous proportional linear change).
[0059] Please refer to Figure 3 , which is a circuit block diagram of a third embodiment of the light emitting diode backlight module 10 of the present utility model; Figure 3 The components shown are Figure 1 The same components are shown, and for simplicity, their description is not repeated here. The shapes of the at least one positive branch circuit 1023 and the at least one negative branch circuit 1024 present a continuous function change in width.
[0060] Please refer to Figure 4 , which is a schematic diagram of an embodiment of the resistance value calculation of the light emitting diode backlight module in the prior art. The at least one positive terminal branch circuit 1023 includes a positive terminal first area P1, a positive terminal second area P2, a positive terminal third area P3, a positive terminal fourth area P4 and a positive terminal fifth area P5, and the at least one negative terminal branch circuit 1024 includes a negative terminal first area N1, a negative terminal second area N2, a negative terminal third area N3, a negative terminal fourth area N4 and a negative terminal fifth area N5; since the at least one positive terminal branch circuit 1023 and the at least one negative terminal branch circuit 1024 are rectangular in shape, it can be assumed that the resistance of the positive terminal first area P1, the positive terminal second area P2, the positive terminal third area P3, the positive terminal fourth area P4, the positive terminal fifth area P5, the negative terminal first area N1, the negative terminal second area N2, the negative terminal third area N3, the negative terminal fourth area N4 and the negative terminal fifth area N5 are all 1 unit ohm.
[0061] for Figure 4 For the at least one positive end light emitting diode 104, the area where the current flows through the at least one positive end branch circuit 1023 and the at least one negative end branch circuit 1024 will include the positive end first area P1, the negative end fifth area N5, the negative end fourth area N4, the negative end third area N3, the negative end second area N2 and the negative end first area N1, so the resistance is 1+1+1+1+1+1=6 unit ohms. Figure 4For the at least one negative-end light-emitting diode 106, the area where the current flows through the at least one positive-end branch circuit 1023 and the at least one negative-end branch circuit 1024 will include the positive-end first area P1, the positive-end second area P2, the positive-end third area P3, the positive-end fourth area P4, the positive-end fifth area P5 and the negative-end first area N1, so the resistance value is also 1+1+1+1+1+1=6 unit ohms. Figure 4 For the middle light-emitting diode 108, the area through which the current flows through the at least one positive branch circuit 1023 and the at least one negative branch circuit 1024 will include the positive first area P1, the positive second area P2, the positive third area P3, the negative third area N3, the negative second area N2 and the negative first area N1, so the resistance value is also 1+1+1+1+1+1=6 unit ohms.
[0062] therefore, Figure 4 The at least one positive-end branch circuit 1023 and the at least one negative-end branch circuit 1024 shown in a rectangular shape cannot help the at least one positive-end light-emitting diode 104 and the at least one negative-end light-emitting diode 106 consume more voltage drop, so that the at least one positive-end light-emitting diode 104 and the at least one negative-end light-emitting diode 106 will be brighter than the middle light-emitting diode 108.
[0063] Please refer to Figure 5 , which is a schematic diagram of an embodiment of the resistance value calculation of the light-emitting diode backlight module 10 of the utility model. The at least one positive end branch circuit 1023 includes a positive end first area P1, a positive end second area P2, a positive end third area P3, a positive end fourth area P4 and a positive end fifth area P5, and the at least one negative end branch circuit 1024 includes a negative end first area N1, a negative end second area N2, a negative end third area N3, a negative end fourth area N4 and a negative end fifth area N5; since the at least one positive end branch circuit 1023 and the at least one negative end branch circuit 1024 are in the shape of a trapezoid, and the wider the width, the smaller the resistance, it can be assumed that the positive end first area P 1. The resistances of the positive terminal second area P2, the positive terminal third area P3, the positive terminal fourth area P4, and the positive terminal fifth area P5 are 1, 2, 3, 4, and 5 unit ohms, respectively, and the resistances of the negative terminal first area N1, the negative terminal second area N2, the negative terminal third area N3, the negative terminal fourth area N4, and the negative terminal fifth area N5 are 1, 2, 3, 4, and 5 unit ohms, respectively.
[0064] for Figure 5For the at least one positive end light emitting diode 104, the area where the current flows through the at least one positive end branch circuit 1023 and the at least one negative end branch circuit 1024 will include the positive end first area P1, the negative end fifth area N5, the negative end fourth area N4, the negative end third area N3, the negative end second area N2 and the negative end first area N1, so the resistance is 1+5+4+3+2+1=16 unit ohms. Figure 5 For the at least one negative-end LED 106, the area where the current flows through the at least one positive-end branch circuit 1023 and the at least one negative-end branch circuit 1024 will include the positive-end first area P1, the positive-end second area P2, the positive-end third area P3, the positive-end fourth area P4, the positive-end fifth area P5 and the negative-end first area N1, so the resistance is 1+2+3+4+5+1=16 unit ohms. However, for Figure 5 For the middle light-emitting diode 108, the area where the current flows through the at least one positive branch circuit 1023 and the at least one negative branch circuit 1024 will include the positive first area P1, the positive second area P2, the positive third area P3, the negative third area N3, the negative second area N2 and the negative first area N1, so the resistance is only 1+2+3+3+2+1=12 unit ohms.
[0065] therefore, Figure 5 The at least one positive end branch circuit 1023 and the at least one negative end branch circuit 1024 shown in the trapezoidal shape can help the at least one positive end LED 104 and the at least one negative end LED 106 consume more voltage drop, so that the voltage and current of the at least one positive end LED 104, the at least one negative end LED 106 and the middle LED 108 are equal, so that the brightness of the at least one positive end LED 104, the at least one negative end LED 106 and the middle LED 108 is the same and the LED backlight module 10 can be evenly illuminated. Furthermore, Figure 5 The shape of the at least one positive branch circuit 1023 and the at least one negative branch circuit 1024 may be a trapezoidal shape or a shape that presents a step-wise change in width (such as Figure 1 ), triangular, or with a continuous function variation in width (such as Figure 3 shown).
[0066] In summary, the utility model changes the resistance value by changing the line width to replace the actual resistance element (such as the surface mount chip resistor), and the utility model has the effect of making the light emitting diode backlight module illuminate uniformly.
[0067] 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. A light emitting diode backlight module, characterized in that: Include: A printed circuit, comprising a positive terminal main line circuit, a negative terminal main line circuit, at least one positive terminal branch line circuit and at least one negative terminal branch line circuit, wherein at least one of the positive terminal branch line circuits comprises a positive connection end and a positive terminal portion, the positive connection end portion is electrically connected to the positive terminal portion and is wider than the positive terminal portion, the positive connection end portion is electrically connected to the positive terminal main line circuit, the negative terminal branch line circuit comprises a negative connection end and a negative terminal portion, the negative connection end portion is electrically connected to the negative terminal portion and is wider than the negative terminal portion, and the negative connection end portion is electrically connected to the negative terminal main line circuit; At least one positive-end light-emitting diode, electrically connected between at least one of the positive-end branch circuits and at least one of the negative-end branch circuits; At least one negative-end light-emitting diode is electrically connected between at least one of the positive-end branch circuits and at least one of the negative-end branch circuits; and an intermediate light emitting diode, electrically connected between at least one of the positive branch circuits and at least one of the negative branch circuits, Among them, at least one of the positive-end LEDs is closer to the positive connection end and the negative end than the middle LED, and at least one of the negative-end LEDs is closer to the negative connection end and the positive end than the middle LED.
2. The light emitting diode backlight module according to claim 1, characterized in that: in, The shape of at least one of the positive-end branch circuits presents a phased change in width.
3. The light emitting diode backlight module according to claim 1, characterized in that: in, The shape of at least one of the negative branch circuits presents a phased change in width.
4. The light emitting diode backlight module according to claim 1, characterized in that: in, The shape of at least one of the positive-end branch circuits is a trapezoid or a triangle.
5. The light emitting diode backlight module according to claim 1, characterized in that: in, At least one of the negative branch circuits is in the shape of a trapezoid or a triangle.
6. The light emitting diode backlight module according to claim 1, characterized in that: in, The shape of at least one of the positive-end branch circuits presents a continuous functional change in width.
7. The light emitting diode backlight module according to claim 1, characterized in that: in, The shape of at least one of the negative branch circuits presents a continuous function change in width.
8. The light emitting diode backlight module according to claim 1, characterized in that: in, At least one of the positive-end branch circuits is vertically connected to the positive-end main circuit, and at least one of the negative-end branch circuits is vertically connected to the negative-end main circuit.
9. The light emitting diode backlight module according to claim 1, characterized in that: in, The printed circuit is a conductive ink material printed circuit.
10. The light emitting diode backlight module according to claim 1, characterized in that: in, The printed circuit is a copper foil printed circuit.