CN102155681A - Light source circuit module with light reflection structure, backlight module and display - Google Patents

Abstract

The invention discloses a light source circuit module with a light reflection structure, a backlight module with the light source circuit module and a display. The light source circuit module comprises a circuit board, a first reflecting layer and a second reflecting layer. The first reflecting layer is formed on one surface of the circuit board and has a first reflectivity. The second reflecting layer is formed on the first reflecting layer to partially cover the first reflecting layer and has a second reflectivity, and the second reflectivity is greater than the first reflectivity. The covering area ratio of the second reflecting layer to the first reflecting layer is changed to achieve the effect of adjusting the reflectivity of the reflecting structure formed by the first reflecting layer and the second reflecting layer, so that the light uniformity provided by the light source circuit module is improved, and the problem that moire is generated due to the fact that light provided by a light source is not uniform in the prior art is solved.

Description

Light source circuit module with light reflection structure, backlight module and display

technical field

The invention relates to a light source circuit module, a backlight module and a display with the light source circuit module, in particular to a light source circuit module, a backlight module and a display with a light reflection structure.

Background technique

With the rapid development of liquid crystal display (Liquid Crystal Display, LCD) manufacturing technology, it has the advantages of light and thin, power saving and no radiation, so that liquid crystal display is widely used in various electronic devices with display requirements, such as personal digital Assistant (Personal Digital Assistant, PDA), notebook computer, digital camera, digital video recorder, computer screen and LCD TV, etc. Since the liquid crystal display panel in the liquid crystal display device is a non-self-illuminating display panel, it needs the light provided by the backlight module to produce the function of displaying images.

With the improvement of light-emitting diode (Light-Emitting Diode, LED) light-emitting technology, the light-emitting power of LED is increasing day by day, so many backlight modules currently use LED as light source. In a smaller display screen, using a smaller number of LEDs can provide sufficient brightness; but in a larger display screen, such as an LCD TV, it must use a larger number of LEDs to provide sufficient brightness for the entire display panel. Adequate backlighting. Taking an LCD TV as an example, the direct-lit backlight module mainly includes a circuit board, a plurality of LED light sources evenly distributed on the circuit board, and a diffusion plate. The light emitted by the plurality of LED light sources enters the diffuser plate, diffuses and mixes the light, and then exits the diffuser plate to provide the uniform backlight required by the liquid crystal module.

However, currently, LCD TVs continue to be designed towards reducing the thickness of the body. In addition to the limited thickness of the liquid crystal module, the thickness of the backlight module is also limited. To reduce the thickness of the backlight module, the thickness of the diffuser plate and the distance between the LED and the diffuser plate bear the brunt. Although the reduction of the thickness of the diffusion plate will affect the light mixing effect, the shortening of the distance between the LED and the diffusion plate has a greater impact, resulting in a rather uneven distribution of light intensity entering the diffusion plate, which makes the effect of the diffusion plate to improve the light distribution limited. The most common The biggest problem is that LCD TVs produce moiré (mura), which makes the display quality of LCD TVs poor.

To solve this problem, there are currently backlight modules coated with reflective materials on the circuit board, so that light can be reflected even in places where there is no light source, so as to improve the problem of uneven distribution of light intensity entering the diffuser plate. Although this method can improve the phenomenon of moiré, since the reflectivity of each part of the circuit board is fixed, and the intensity of light reaching all parts of the circuit board decreases with the increase of the distance from the light source, the light reflected from all parts of the circuit board The intensity also decreases as the distance from the light source increases, so the overall intensity of the light reflected by the circuit board farther away from the light source is still weaker, so that the overall light distribution is still concentrated, and the phenomenon of moiré is still the same. Exist, the improvement effect is limited. Therefore, there is a real need to propose a light-emitting structure that can provide a sufficiently uniform light source under the condition that the thickness of the backlight module is reduced, so as to solve the above-mentioned problems.

Contents of the invention

One of the objectives of the present invention is to provide a light source circuit module, which uses multi-layer reflective layers to form a light reflection structure, and uses the area variation of the reflective block with high reflectivity to improve the uniformity of light generated by the light source circuit module.

The light source circuit module of the present invention includes a circuit board, a first reflective layer and a second reflective layer. The circuit board includes a plurality of electrical connection areas, and each electrical connection area can be electrically fixed for a light emitting diode. The first reflective layer is formed on a surface of the circuit board, and the first reflective layer has a first reflectivity. The second reflective layer is formed on the first reflective layer to partially cover the first reflective layer, the second reflective layer has a second reflectivity, the second reflectivity is greater than the first reflectivity, the second The reflective layer includes a plurality of reflective blocks distributed on the first reflective layer, and the area of the reflective blocks increases as the distance between the closest electrical connection regions increases.

Thereby, the area of the reflective block farther away from the multiple electrical connection areas is larger, and the intensity of light reflected by the reflective block is stronger, so it can be used to compensate for the farther away from the multiple electrical connection areas, the light Due to the problem of insufficient distribution, the light source circuit module as a whole can provide a more uniform light source than the light source module in the prior art that only forms a reflective layer with a single reflectivity on the circuit board.

Another object of the present invention is to provide a light source circuit module, which uses multi-layer reflective layers to form a light reflection structure, and uses the area variation of the hollowed-out area with high reflectivity to improve the uniformity of light generated by the light source circuit module.

The light source circuit module of the present invention includes a circuit board, a first reflective layer and a second reflective layer. The circuit board includes a plurality of electrical connection areas, and each electrical connection area can be electrically fixed for a light emitting diode. The first reflective layer is formed on a surface of the circuit board, and the first reflective layer has a first reflectivity. The second reflective layer is formed on the first reflective layer to partially cover the first reflective layer, the second reflective layer has a second reflectivity, the second reflectivity is greater than the first reflectivity, the second The reflective layer includes a plurality of hollowed out areas distributed on the first reflective layer, and the area of the hollowed out areas decreases as the distance between the hollowed out areas and the closest electrical connection area increases.

In this way, the area of the hollowed-out area farther away from the plurality of electrical connection areas is smaller, and the intensity of light reflected by the second reflective layer is stronger, so it can also be used to compensate for areas farther away from the plurality of electrical connection areas, The problem of insufficient light distribution makes the light source circuit module as a whole provide a more uniform light source than the light source module in the prior art that only forms a reflective layer with a single reflectivity on the circuit board.

Another object of the present invention is to provide a backlight module, which adopts the light source circuit module of the present invention to provide a more uniform backlight than the backlight module in the prior art.

The backlight module of the present invention includes a light source circuit module of the present invention and a diffusion plate. The diffusion plate is arranged on the circuit board of the light source circuit module. Since the light source circuit module improves the uniformity of the light provided, as mentioned above, the light entering the diffuser plate is diffused and mixed by the diffuser plate, and then exits the diffuser plate to present a backlight that is better than that of the prior art. The module has a more uniform backlight and avoids the generation of moiré.

Another object of the present invention is to provide a display using the backlight module of the present invention to provide image display with more uniform brightness than the display in the prior art.

The backlight module of the present invention includes a backlight module of the present invention and a display panel. The display panel is arranged on the diffusion plate of the backlight module. Since the backlight module can provide more uniform backlight than the backlight module in the prior art, as mentioned above, the display panel can use the uniform backlight to display high-quality images with more uniform brightness and more saturated colors.

Compared with the aforementioned technology, the light source circuit module of the present invention uses a multi-layer reflective layer to form a light reflective structure, and by changing the ratio of the covered area of the second reflective layer to the first reflective layer, it is possible to adjust The effect of the reflectivity of the reflective structure formed by the second reflective layer is to make the light intensity reflected by the area farther away from the plurality of electrical connection areas stronger, so as to overcome the problem of insufficient light distribution, and then make the light source circuit module As a whole, it can provide more uniform light distribution than the light source module in the prior art that only forms a reflective layer with a single reflectivity on the circuit board. In short, the light source circuit module of the present invention uses the reflective structure with variable reflectivity as a variable or design freedom to improve the uniformity of the backlight, so that the design flexibility of the backlight structure can be increased. The backlight module of the present invention utilizes the light provided by this, diffuses and mixes light through the diffusion plate, and then provides a more uniform backlight than the backlight module in the prior art, effectively suppressing the moiré phenomenon; further, the display of the present invention is Utilize this backlight module to provide high-quality image display with more uniform brightness and more saturated color.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

1 is a top view of a light source circuit module according to a first preferred embodiment of the present invention;

Fig. 2 is a sectional view of the light source circuit module in Fig. 1 along the secant line X-X;

3 is a top view of a light source circuit module according to a second preferred embodiment of the present invention;

Fig. 4 is a sectional view of the light source circuit module in Fig. 3 along the secant line Y-Y;

5 is a schematic cross-sectional view of a backlight module according to a third preferred embodiment of the present invention;

FIG. 6 is a partial cross-sectional view of a display according to a fourth preferred embodiment of the present invention.

Among them, reference signs

1, 3 Light source circuit module 2 Light emitting diode

5 Backlight Module 7 Display

12, 32 Circuit board 14, 34 The first reflective layer

16, 36 Second reflective layer 52 Diffusion plate

72 Display panel 122, 322 Electrical connection area

124, 324 Surfaces 162 Reflection blocks

362 Hollow Out Area 522 Opaque Dots

1222, 3222 electrode pad D distance

Detailed ways

Please refer to Figure 1 and Figure 2, Figure 1 is a top view of a light source circuit module 1 according to a first preferred embodiment of the present invention, Figure 2 is a cross-sectional view of the light source circuit module 1 in Figure 1 along the section line X-X . The light source circuit module 1 includes a circuit board 12 , a first reflective layer 14 and a second reflective layer 16 . The circuit board 12 includes a plurality of electrical connection areas 122 (indicated by boxes), and each electrical connection area 122 may include two electrode pads 1222 on which a light emitting diode 2 is electrically connected and fixed. The first reflective layer 14 is formed on a surface 124 of the circuit board 12 and has a first reflectivity R1. The second reflective layer 16 is formed on the first reflective layer 14 to partially cover the first reflective layer 14 and has a second reflectivity R2 greater than the first reflectivity R1. The second reflective layer 16 includes a plurality of reflective blocks 162, which are distributed on the first reflective layer 14. The area of the reflective blocks 162 increases as the distance D between the closest electrical connection region 122 increases, wherein for convenience In FIG. 2, the reflective block 162 is indicated by hatching. In addition, in this embodiment, the aforementioned distance D can be defined as the distance between the centroid of the reflective block 162 and the centroid of the nearest electrical connection region 122 ; but the present invention is not limited thereto.

Overall, each area on the circuit board 12 has different reflectivity due to the different distribution of the reflective blocks 162, and the reflectivity is jointly contributed by the reflective blocks 162 of the first reflective layer 14 and the second reflective layer 16, For example, the operational definition of the reflectivity of a certain region can be within the region, the area ratio P1 exposed by the first reflective layer 14 multiplied by the first reflectivity R1 and the exposed area ratio of the reflective block 162 of the second reflective layer 16 P2 is multiplied by the sum of the second reflectivity R2 (P1×R1+P2×R2), and its property is an average reflectivity, wherein the setting of the area size should consider the actual area size of the reflective block 162, so as to Avoid distortion of reflectivity calculation caused by improper selection of target area. In this embodiment, since the area of the reflective block 162 farther away from the electrical connection area 122 is larger, the reflectivity of the area on the circuit board 12 farther away from the electrical connection area 122 is larger. In application, the light emitted from the light emitting diode 2 will be partially reflected by other components combined with the light source circuit module 1, such as the light guide plate of the backlight module. farther away. Although the intensity of the light that reaches the farther away from the light emitting diode 2 is weaker, since the reflectivity of the farther area of the circuit board 12 from the light emitting diode 2 or the electrical connection area 122 is greater, it can be reflected relative to its incident light. Strong reflected light can be compensated for this intensity attenuation, so that even if the place is far away from the light-emitting diode 2, the overall reflected light can be maintained above a certain intensity by designing the reflectivity of the place; in other words, the light source The circuit module 1 as a whole can provide relatively uniform light distribution to the outside, which solves the problem in the prior art that the backlight module only forms a reflective layer with a single reflectivity on the circuit board and cannot effectively improve the concentrated distribution of light.

It should be added that since the reflective blocks 162 are discretely distributed, the introduction of the aforementioned average reflectance is only for the convenience of analysis and understanding of the light reflective structure formed by the first reflective layer 14 and the second reflective layer 16, and does not limit this embodiment. In this example, the reflective block 162 and the first reflective layer 14 form a homogeneous reflective structure. In addition, the reflected light after multiple reflections or light transmission itself is usually accompanied by intensity attenuation. If the attenuation is obvious, in practice, the area of the reflection block 162 should be increased to compensate for the attenuation.

In addition, in this embodiment, the first reflectivity R1 is greater than or equal to 30% and less than or equal to 98%, and the second reflectivity R2 is greater than or equal to 90% and less than or equal to 100%. When selecting materials to match the first reflective layer 14 With the second reflective layer 16, it should still be noted that the second reflectivity R2 should be greater than the first reflectivity R1, such as selecting the material of the first reflective layer 14 to include metal or metal compound, such as barium sulfate (reflectivity about 98%) ), the material of the second reflective layer 16 can be correspondingly selected as silver powder (reflectivity greater than 99%); but the present invention is not limited thereto. Also, the first reflective layer 14 and the second reflective layer 16 can be coated on the circuit board 12 sequentially by printing, but the present invention is not limited thereto, for example, they can be arranged on the circuit board 12 with sheets .

Please refer to FIG. 3 and FIG. 4, FIG. 3 is a top view of a light source circuit module 3 according to a second preferred embodiment of the present invention, and FIG. 4 is a cross-sectional view of the light source circuit module 3 in FIG. 3 along the secant line Y-Y . The light source circuit module 3 includes a circuit board 32 , a first reflective layer 34 and a second reflective layer 36 . The circuit board 32 includes a plurality of electrical connection areas 322 (areas indicated by boxes), and each electrical connection area 322 includes two electrode pads 3222 on which a light emitting diode 2 is electrically connected and fixed. The first reflective layer 34 is formed on a surface 324 of the circuit board 32 and has a first reflectivity R1. The second reflective layer 36 is formed on the first reflective layer 34 to partially cover the first reflective layer 34 and has a second reflectivity R2 greater than the first reflectivity R1. The second reflective layer 36 includes a plurality of hollowed-out areas 362 distributed on the first reflective layer 34. The area of the hollowed-out areas 362 decreases as the distance D between the closest electrical connection area 322 increases. In FIG. 3 , the hollow area 362 is indicated by hatching, and the first reflective layer 34 exposed in the hollow area 362 is not otherwise indicated. Likewise, in this embodiment, the aforementioned distance D can be defined as the distance from the centroid of the hollowed out area 362 to the centroid of the nearest electrical connection area 322 ; but the invention is not limited thereto.

In this embodiment, each region on the circuit board 32 has a different reflectivity due to the different distribution of the hollowed out region 362, and the reflectivity is also jointly contributed by the first reflective layer 34 and the second reflective layer 36, a certain The operational definition of the reflectivity of the region can also be calculated based on the ratio of the exposed areas of the first reflective layer 34 and the second reflective layer 36, as described in the foregoing first preferred embodiment about the reflectivity, no longer repeat. In this embodiment, because the area of the hollowed-out area 362 farther away from the electrical connection area 122 is smaller, in other words, the proportion of the second reflective layer 36 covering the first reflective layer 34 in this area is relatively high. The reflectivity of the area farther from the electrical connection area 322 is greater. It is added that in the first preferred embodiment, the light source circuit module 1 changes the area of the reflective block 162 to increase the proportion of the second reflective layer 16 covering the first reflective layer 14, thereby achieving the purpose of controlling the reflectivity; In the second preferred embodiment, the light source circuit module 3 changes the area of the hollow area 362 to increase the proportion of the second reflective layer 36 covering the first reflective layer 34 , which can also achieve the purpose of controlling the reflectivity. In short, both of them achieve the purpose of controlling the reflectivity by changing the ratio of the exposed area of the first reflective layer 14, 34 and the second reflective layer 16, 36, so the basic spirit of the technical means of the two is the same. Therefore, other descriptions about the first reflective layer 34 and the second reflective layer 36 can refer to the relevant descriptions in the aforementioned first preferred embodiment, and will not be repeated here.

Please refer to FIG. 5 , which is a partial cross-sectional view of a backlight module 5 according to a third preferred embodiment of the present invention. The backlight module 5 includes the aforementioned light source circuit module 1 and a diffuser plate 52. The diffuser plate 52 is arranged on the circuit board 12. For the description of the components of the light source circuit module 1, please refer to the above-mentioned first preferred embodiment. In addition, for the convenience of description, in FIG. 5 , the path of the light emitted from the light emitting diode 2 is represented by a dotted line, including paths such as refraction and reflection.

As shown in FIG. 5 , not all of the light emitted from the LED 2 directly enters the diffusion plate 52 , and at least part of it is reflected by the diffusion plate 52 and travels toward the circuit board 12 . The reflected light will be reflected by the light reflection structure formed by the first reflective layer 14 and the second reflective layer 16, and only part of the light reflected twice can enter the diffuser plate 52, and the rest will be absorbed by the diffuser plate 52. Reflection, the light reflected multiple times can reach the area far away from the light emitting diode 2 . In this way, the diffusion plate 52 can not only receive the light near the light emitting diode 2, but also receive the light reflected by the first reflective layer 14 and the second reflective layer 16 away from the light emitting diode 2, so the diffuser plate 52 receives The incident light is more uniform than the backlight module of the known point light source, and the light distribution received by the diffuser plate 52 is also more uniform than the known backlight module which only forms a reflective layer with a single reflectivity on the circuit board, and then the diffuser plate 52 can provide more uniform It is known that the backlight module has a more uniform backlight; in other words, the backlight module of the present invention can not only alleviate the moiré phenomenon, but also greatly improve the uniformity of the backlight by designing the change degree of the reflectivity of the light reflection structure.

In addition, in this embodiment, the diffuser plate 52 can also include a plurality of opaque dots 522, which can block the amount of light entering the diffuser plate 52, so as to reduce the difference between the intensity of light entering from each area on the surface of the diffuser plate 52, It also contributes to the uniformity of the backlight provided by the backlight module 5 . Also, if the opaque dots 522 are made of reflective materials, the light reflected by the opaque dots 522 can be further transmitted to the area farther away from the light emitting diode 2, so as to increase the light reflected by the light reflection structure farther away from the light emitting diode 2 The intensity of the backlight module 5 can also further improve the uniformity of the backlight provided by the backlight module 5 . It is supplemented that the backlight module of the present invention is not limited to the light source circuit module 1 as the light source providing device in practice, and the embodiments of the various light source circuit modules mentioned above or their deformations and combinations can be used as the light source of the backlight module of the present invention. Provide the device.

Please refer to FIG. 6 , which is a partial cross-sectional view of a display 7 according to a fourth preferred embodiment of the present invention. The display 7 includes the aforementioned backlight module 5 and a display panel 72, and the display panel 72 is arranged on the diffuser plate 52. For the description of the backlight module 5, please refer to the relevant description in the aforementioned third preferred embodiment, and will not repeat them here. . As shown in FIG. 6 , the backlight module 5 diffuses and mixes light through the diffuser plate 52 to provide fairly uniform backlight to the display panel 72 (light paths are indicated by dotted lines). Thereby, the display panel 72 of the display 7 of the present invention can utilize the uniform backlight provided by the backlight module 5 to display more uniform brightness and color than the known display with a light reflection structure that only forms a reflective layer with a single reflectivity on the circuit board. More saturated high-quality images. It is supplemented that the backlight module of the display of the present invention is not limited to the backlight module 5 in FIG. in the display of the present invention.

Compared with the aforementioned technology, the light source circuit module of the present invention uses multi-layer reflective layers to form a light reflective structure with varying reflectivity, so that the farther away from the plurality of electrical connection areas, the stronger the intensity of reflected light, so that the light source The circuit module as a whole can provide more uniform light distribution than the light source module in the prior art which only forms a reflective layer with a single reflectivity on the circuit board. In short, the light source circuit module of the present invention uses a reflective structure with variable reflectivity as a variable or design freedom to improve the uniformity of the backlight, thereby increasing the design flexibility of the backlight structure. The backlight module of the present invention utilizes the light source module to provide more uniform backlight than the backlight module in the prior art, and effectively suppress the moiré phenomenon. The display of the present invention utilizes the backlight module to provide high-quality image display with more uniform brightness and more saturated color.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. circuit of light sources module is characterized in that it comprises:

One circuit board comprises a plurality of electrical connections zone, and each is electrically connected the zone can be electrically fixing for a light emitting diode;

One first reflecting layer is formed on the surface of this circuit board, and this first reflecting layer has one first reflectivity; And

One second reflecting layer, be formed on this first reflecting layer partly to hide this first reflecting layer, this second reflecting layer has one second reflectivity, this second reflectivity is greater than this first reflectivity, this second reflecting layer comprises a plurality of reflection blocks, be distributed on this first reflecting layer, the area of this reflection block is along with increasing and increase with its nearest distance that is electrically connected between the zone.

2. circuit of light sources module according to claim 1 is characterized in that, this first reflectivity is more than or equal to 30% and smaller or equal to 98%.

3. circuit of light sources module according to claim 1 is characterized in that, this second reflectivity is more than or equal to 90% and smaller or equal to 99%.

4. circuit of light sources module according to claim 1 is characterized in that the material in this first reflecting layer comprises metal or metallic compound.

5. circuit of light sources module according to claim 1 is characterized in that, the material in this first reflecting layer is a barium sulfate.

6. circuit of light sources module according to claim 1 is characterized in that the material in this second reflecting layer comprises metal or metallic compound.

7. circuit of light sources module according to claim 1 is characterized in that, the material in this second reflecting layer is a silver powder.

8. circuit of light sources module is characterized in that it comprises:

One circuit board comprises a plurality of electrical connections zone, and each is electrically connected the zone can be electrically fixing for a light emitting diode;

One first reflecting layer is formed on the surface of this circuit board, and this first reflecting layer has one first reflectivity; And

One second reflecting layer, be formed on this first reflecting layer partly to hide this first reflecting layer, this second reflecting layer has one second reflectivity, this second reflectivity is greater than this first reflectivity, this second reflecting layer comprises a plurality of hollow outs zone, be distributed on this first reflecting layer, the area in this hollow out zone is along with increasing and reduce with its nearest distance that is electrically connected between the zone.

9. backlight module is characterized in that it comprises:

One according to claim 1 each described circuit of light sources module to the claim 8; And

One diffuser plate is arranged on this circuit board.

10. display is characterized in that it comprises:

One backlight module according to claim 9; And

One display floater is arranged on this diffuser plate.

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