Reflector, backlight module and television set

[0031] Example one:

[0032] Figure 1 to Figure 3 The schematic diagram of the structure of the backlight module of the present invention is shown.

[0033] among them, figure 1 Is a schematic diagram of an embodiment of the backlight module according to the present invention, figure 2 Yes figure 1 Schematic diagram of the A-A section in the middle, image 3 Yes figure 1 The schematic diagram of the effect of the reflective sheet on the beam shown in.

[0034] Such as Figure 1 to Figure 3 As shown, the present invention also provides a backlight module 100, comprising a diffuser 2 and a reflective sheet, the bottom of the recess 11 of the reflective sheet is provided with a light-emitting element 3, and the open end of the recess 11 faces the Mentioned diffuser.

[0035] The reflective sheet provided by the present invention includes a reflective sheet main body 1, the reflective sheet main body 1 includes a reflective sheet main body bottom 5 and a reflective sheet main body side 4, and the reflective sheet main body bottom 5 is provided with a groove 11.

[0036] In the current LED backlight module, the LED lamp is attached to the plane of the entire backplane, and the bottom and sides of the LED lamp are equipped with flat reflectors. Under certain energy conditions, the flat reflector will affect the LED lamp. The beam has no constraining ability, resulting in a large angle of light and more light scattered around, so the light loss is large. In order to ensure sufficient brightness of the display screen, multiple LED lights need to be installed, which increases the cost of parts. At the same time, the structure of the TV is more complicated, which increases the cost of the whole TV; it is also necessary to expand the mixing distance to make the light effect more uniform, which makes the thickness of the whole TV larger and affects the aesthetics of the product And market competitiveness.

[0037] Generally, the problem of insufficient light mixing distance and low light efficiency is solved by adding a lens to the LED lamp above the reflector. However, this method requires a lot of expensive optical films and increases the procurement cost of parts. Makes the cost of the TV set rises, reducing the market competitiveness of the product.

[0038] In view of the current problems, the present invention proposes a foam type that optimizes the reflective sheet from a planar state to a three-dimensional state.

[0039] In this program, the most critical points are:

[0040] The reflective sheet provided by the present invention includes a reflective sheet main body 1, the reflective sheet main body 1 includes a reflective sheet main body bottom 5 and a reflective sheet main body side 4, and a groove 11 is provided on the reflective sheet main body bottom 5.

[0041] Preferably, the bottom 5 of the reflective sheet body and the groove 11 are integrally formed by foam molding.

[0042] Of course, the bottom 5 of the reflector body and the groove 11 can also be integrally stamped and formed.

[0043] Such as image 3 As shown, the present invention utilizes the contraction of the divergence angle of the light beam by each foaming groove 11 to increase the light efficiency in a small area of ​​each lamp, thereby increasing the light efficiency of the entire backlight.

[0044] After the light emitted by the LED lamp is reflected by the upper diffuser, the ordinary flat reflector will reflect the light back to the diffuser again, but the direction of the light at this time changes, and the divergence direction of the light will change greatly, so the diffuser is partially The received energy will be reduced, so the ordinary flat reflector has less ability to restrain light.

[0045] Such as image 3 As shown, after the light is reflected by the arc-shaped reflector (ie the groove 11), it will return to the diffuser 2 again, but the direction at this time is changed to the opposite direction, and the arc of the groove 11 faces the restraint of the light. The ability is strong, and the light is still constrained in the entire small range. Therefore, the energy received by the light guide plate 2 is relatively large, the brightness of the display screen is higher, the brightness is more uniform, and the overall light efficiency is better, so that it can reduce The light mixing distance of the small backlight module ensures that the brightness of the backlight module is higher and the brightness is more uniform.

[0046] The inventor compares the flat reflective sheet and the three-dimensional foamed reflective sheet.

[0047] Based on a set of actual measurement data, under the condition that the mixing distance, the number of LED lamps, the driving voltage and the current number are the same, the brightness tested by the ordinary reflective sheet is about 260nit, and the foamed reflective sheet is used for the test. The brightness of the same point is about 310nit, which obviously increases the brightness by as much as 20%.

[0048] Therefore, if a foamed reflector is used under certain conditions of brightness requirements, we can meet the brightness requirements by reducing the number of LED lights.

[0049] The light emitted by the LED lamp exists at all angles. When the light is diffusely reflected by the flat reflector, it will be scattered around, so that the light energy received by the light guide plate per unit area will be relatively small.

[0050] If you use Figure 1 to Figure 3 In the reflector structure shown, there is a groove 11 in a small area of ​​each LED lamp, and the groove can be obtained by foaming treatment or by other processing means, such as machining.

[0051] Through the restraining effect of the foamed groove 11 on the light exit angle of the light, the utilization efficiency of light energy is effectively improved.

[0052] At the same time, we can also artificially control the distribution of energy in all directions by controlling the shape of the reflector foam (groove 11), which increases the freedom of LED lamp arrangement to a certain extent.

[0053] The freedom of LED lamp arrangement mainly includes the density of LED lamp arrangement, the number of LED lamp arrangement, and the form of LED lamp arrangement. For example, in the existing backlight module, it is restricted by the poor ability of the reflector to restrain the beam. Long light mixing distance and low brightness of the backlight module require more LED lights. However, after adopting the reflective sheet with grooves provided by the present invention, the restriction of the grooves on the beam of the LED lights increases, indicating The intensity of the light received by the screen increases and the brightness increases. Therefore, the number of LED lights can be reduced when the LED lights are arranged, the distance between two adjacent LED lights can be increased, and the arrangement density of the LED lights can be reduced, which can save zero In addition, most of the existing LED layouts are arranged in a square matrix, that is, the number of rows and columns of LED lights are equal, and the distance between the LED lights is also equal, so that the four corners of the display The brightness is low, which affects the viewing effect. After using the reflector provided by the present invention, the arrangement of the LED lights can be in a non-matrix form, that is, the arrangement time interval of the LED lights can be varied, and the LED lights can also be arranged in a rectangular array. , This reduces the design difficulty.

[0054] In the solution provided by the present invention, the groove 11 may also be an ellipsoidal groove.

[0055] Of course, the groove 11 may be a spherical groove.

[0056] Preferably, the groove 11 may also be a truncated trough.

[0057] Preferably, the groove 11 can also be a prism trough.

[0058] Of course, the distributed grooves 11 on the bottom 5 of the reflector body can also be any combination of the above-mentioned shapes, and the specific shape can be selected according to the type and design requirements of the TV.

[0059] Further, a plurality of the grooves 11 are uniformly arranged on the bottom 5 of the reflector body.

[0060] When the grooves 11 are provided on the bottom 5 of the reflector body, a standard matrix distribution can be used, and a regular number of rows and columns can be set so that the grooves 11 are regularly arranged on the reflector 1. Of course, a ring shape can also be used. The reflector is arranged in an array.

[0061] The arrangement of the grooves 11 on the bottom 5 of the reflector body can be uniform or irregular, as long as they can meet the light efficiency requirements of the TV backlight module.

[0062] The foaming arc of the novel reflective sheet provided by the present invention (that is, the arc of the groove 11, which is the arc of the punched groove for an integrally stamped groove 11) has a greater impact on the light mixing distance of the direct-lit LED. In general direct-lit LEDs, if the mixing distance is insufficient, it will cause serious lamp shadows and uneven brightness, while the foamed reflector can solve the problem of insufficient light mixing to a certain extent through its groove 11 , To improve the subjective light shadow problem of ordinary direct-lit LED backlight modules.

[0063] The confinement effect of the groove 11 on the light beam makes the light output of the LED lamp more uniform, which can significantly improve the uneven distribution of brightness and darkness caused by insufficient light mixing distance.

[0064] When the LED lamp is at the bottom of the groove 11, if the arc around the bottom of the groove 11 is different, the number of reflections and the exit angle of the light in the groove are also different.

[0065] reference image 3 It can be seen that when the arc of the groove 11 is larger (that is, the arc transition of the groove is smoother), the number of reflections of light in the groove 11 is more, and the upper opening is also smaller, and the light guide plate 2 partially receives The energy of is larger, which means that the energy is relatively not scattered, and local bright spots and local dark shadows may appear, that is, uneven distribution of light and dark may appear;

[0066] When the arc of the groove 11 is large, the number of times the light is reflected in the groove 11 is less, and the upper opening is also larger, and the energy received by the light guide plate is small, which is equivalent to relatively spreading the energy, which can reduce The transition between dark shadows and bright spots significantly improves the unevenness of light and dark.

[0067] The backlight module provided in this embodiment has the following beneficial effects:

[0068] In a small area of ​​each LED lamp, the light-emitting angle of the LED lamp is restricted by the groove, which effectively improves the light energy utilization rate. At the same time, it is also possible to control the distribution of energy in various directions by controlling the shape of the groove, which increases the freedom of arrangement of the LED lights to a certain extent. The restraining effect of the groove on the light source can also solve the problem of insufficient light mixing to a certain extent, and change the subjective lamp shadow problem existing in ordinary direct-lit backlight modules.

[0069] Such as Figure 4 Shown is a projection view of the longitudinal section of the groove 11 (that is, in the xy plane).

[0070] In the technical solution provided by the present invention, the most critical part is: the shape and size of the eggshell three-dimensional reflector (ie the groove 11), and the three-dimensional reflector (the shape of the groove 11) satisfies the ellipsoid in the xyz-Cartesian coordinates The equation of the system:

[0071] a -2 x 2 +b -2 y 2 +c -2 z 2 = 1 (1)

[0072] In formula (1), a is the long axis of the ellipsoid in the xy plane, b is the short axis of the ellipsoid in the xy plane, and c is the polar radius of the ellipsoid.

[0073] In this embodiment, the polar radius of the ellipsoid is b (that is, the depth of the groove 11), and the open end surface of the ellipsoid is circular, that is, the long axis a and the short axis c are equal in the xy plane,

[0074] Therefore, the above formula (1) can be written as

[0075] a -2 x 2 +b -2 y 2 +a -2 z 2 =1 (2)

[0076] While keeping the relative proportions of a and b unchanged, the sizes of a and b can be stretched to match the assembly requirements of backlight modules of different sizes.

[0077] In the process of realizing the present invention, through multiple simulation experiments, a better ratio and value of a and b are obtained. Figure 4 In the structure, LED lights can be installed at point A.

[0078] Embodiment two:

[0079] The present invention also provides a television (not shown in the figure), which includes the aforementioned backlight module 100.

[0080] In view of the problems existing in the current TV backlight module, the present invention proposes a foaming solution that optimizes the reflective sheet from a planar state to a three-dimensional state.

[0081] In this program, the most critical points are:

[0082] The reflective sheet provided by the present invention includes a reflective sheet body 1, and a groove 11 is provided at the bottom 5 of the reflective sheet body.

[0083] Preferably, the bottom 5 of the reflective sheet body and the groove 11 are integrally formed by foam molding.

[0084] Such as image 3 As shown, the present invention utilizes the contraction of the divergence angle of the light beam by each foaming groove 11 to increase the light efficiency in a small area of ​​each lamp, thereby increasing the light efficiency of the entire backlight.

[0085] After the light emitted by the LED lamp is reflected by the upper diffuser, the ordinary flat reflector will reflect the light back to the diffuser again, but the direction of the light at this time changes, and the divergence direction of the light will change greatly, so the diffuser is partially The received energy will be reduced, so the ordinary flat reflector has less ability to restrain light.

[0086] Such as image 3 As shown, after the light is reflected by the arc-shaped reflector (ie the groove 11), it will return to the diffuser 2 again, but the direction at this time is changed to the opposite direction, and the arc of the groove 11 faces the restraint of the light. The ability is strong, and the light is still confined in the entire small range. Therefore, the energy received by the light guide plate 2 is relatively large, the brightness of the display screen is higher, the brightness is more uniform, and the overall light effect is better.

[0087] The inventor compares the flat reflective sheet and the three-dimensional foamed reflective sheet.

[0088] Based on a set of actual measurement data, under the condition that the mixing distance, the number of LED lamps, the driving voltage and the current number are the same, the brightness tested by the ordinary reflective sheet is about 260nit, and the foamed reflective sheet is used for the test. The brightness of the same point is about 310nit, which obviously increases the brightness by as much as 20%.

[0089] Therefore, if a foamed reflector is used under certain conditions of brightness requirements, we can meet the brightness requirements by reducing the number of LED lights.

[0090] The light emitted by the LED lamp exists at all angles. When the light is diffusely reflected by the flat reflector, it will be scattered around, so that the light energy received per unit area of ​​the light guide plate will be relatively small.

[0091] If you use Figure 1 to Figure 3 In the reflector structure shown, there is a groove 11 in a small area of ​​each LED lamp, and the groove can be obtained by foaming treatment or by other processing means, such as machining.

[0092] Through the restraining effect of the foamed groove 11 on the light exit angle of the light, the utilization efficiency of light energy is effectively improved.

[0093] At the same time, we can also artificially control the distribution of energy in all directions by controlling the shape of the reflector foam (groove 11), which increases the freedom of LED lamp arrangement to a certain extent.

[0094] In the solution provided by the present invention, the groove 11 may also be an ellipsoidal groove.

[0095] Of course, the groove 11 may be a spherical groove. .

[0096] Preferably, the groove 11 may also be a truncated trough.

[0097] Preferably, the groove 11 can also be a prism trough.

[0098] Of course, the distributed grooves 11 on the bottom 5 of the reflector body can also be any combination of the above-mentioned shapes, and the specific shape can be selected according to the type and design requirements of the TV.

[0099] Further, a plurality of the grooves 11 are uniformly arranged on the bottom 5 of the reflector body.

[0100] When the grooves 11 are provided on the bottom 5 of the reflector body, a standard matrix distribution can be used, and a regular number of rows and columns can be set so that the grooves 11 are regularly arranged on the reflector 1. Of course, a ring shape can also be used. The reflector is arranged in an array.

[0101] The arrangement of the grooves 11 on the bottom 5 of the reflector body can be uniform or irregular, as long as they can meet the light efficiency requirements of the TV backlight module.

[0102] The foaming arc of the novel reflective sheet provided by the present invention (that is, the arc of the groove 11) has a greater impact on the light mixing distance of the direct-lit LED. In general direct-lit LEDs, if the mixing distance is insufficient, it will cause serious lamp shadows and uneven brightness, while the foamed reflector can solve the problem of insufficient light mixing to a certain extent through its groove 11 , To improve the subjective light shadow problem of ordinary direct-lit LED backlight modules.

[0103] The confinement effect of the groove 11 on the light beam makes the light output of the LED lamp more uniform, which can significantly improve the uneven distribution of brightness and darkness caused by insufficient light mixing distance.

[0104] When the LED lamp is at the bottom of the groove 11, if the arc around the bottom of the groove 11 is different, the number of reflections and the exit angle of the light in the groove are also different.

[0105] Preferably, the light-emitting element 3 is a light-emitting diode (ie, an LED lamp).

[0106] Of course, the light-emitting element 3 of the present invention can also be other types of light sources.

[0107] In this embodiment, a reflective sheet with an ellipsoidal groove is used to make the light emitted by the LED lamp have a stronger binding force. In 3D technology, it is necessary to present a three-dimensional effect in the area on the display screen. Dynamic control, for example, at a certain moment, the upper half of the display screen is displayed, and the lower half is dark. In a very short time, another video signal is displayed through the lower half, and the upper half is at the same time. The dark shadow state, so that the two signals enter the left and right eyes of the viewer separately without the human eye noticing, and together they synthesize an image with a three-dimensional effect. Of course, the screen can also be divided into upper, middle, and lower parts for separate control. This requires good mutual interference immunity between the various parts of the backlight module, that is, when a certain area is needed for imaging, other areas are in a better dark state, forming a good contrast with the imaging area, otherwise it is in a dark state The contrast between the area and the imaging area is not large, which will seriously interfere with the viewer's attention and reduce the resolution of the 3D display.

[0108] The reflective sheet with an ellipsoidal groove provided in this embodiment makes the light emitted by the LED lamp more restrictive. If the upper half of the display screen needs to be displayed, the upper half of the LED lamp is controlled The upper half of the display has good brightness. At this time, since the lower LED of the backlight module is turned off, the light beam of the upper LED will not interfere with the dark shadow of the lower half of the display, making the display The top half and the bottom half form a good contrast, which improves the viewer's resolution of the display.

[0109] After adopting the reflective sheet with grooves provided by the present invention, coupled with the low response time of the LED light source itself, it can better meet the requirements of 3D display for dynamic control of the backlight module area, and improve the contrast of the dynamic area and the viewer For the resolution of the display, improve the user experience.

[0110] In the first set of simulation experiments, a 42-inch LCD screen is taken as an example, such as Figure 5 , Image 6 As shown, a=17mm and b=12mm are selected according to the size of the backlight module. The simulation results show that the uniformity and anti-interference ability of this solution are both good. among them Figure 5 It is a schematic diagram of the light effect of all the lights, Figure 5 The picture on the left is the brightness of the LCD screen with all the lights on, and the right is the illuminance. Figure 5 The figure on the left shows that the backlight uniformity of this solution is good. Image 6 It is a schematic diagram of the light effect of half of the lights, by Image 6 As you can see on the left, the upper brightness is clearly distinguished from the lower brightness, and the backlight contrast is better, which can significantly improve the contrast of the 3D display, improve the requirements for dynamic control of the backlight module area, and improve the contrast and resolution of the dynamic area.

[0111] In the second set of simulation experiments, a 42-inch LCD screen is taken as an example, such as Figure 7 , Figure 8 As shown, a=8mm and b=13mm are selected according to the size of the backlight module, and the simulation results show that the uniformity and anti-interference ability of this solution are good. among them Figure 7 It is a schematic diagram of the light effect of all the lights, Figure 7 The picture on the left is the brightness of the LCD screen with all the lights on, and the right is the illuminance. Figure 7 The figure on the left shows that the backlight uniformity of this solution is good. Figure 8 It is a schematic diagram of the light effect of half of the lights, by Figure 8 As you can see on the left, the upper brightness is clearly distinguished from the lower brightness, and the backlight contrast is better, which can significantly improve the contrast of the 3D display, improve the requirements for dynamic control of the backlight module area, and improve the contrast and resolution of the dynamic area.

[0112] In the third set of simulation experiments, taking a 42-inch LCD screen as an example, the inventor used a dish-shaped (ie truncated cone-shaped) three-dimensional reflector with an upper bottom radius of 5mm, a lower bottom radius of 7mm, and a depth of 13mm. The simulation structure is as follows Picture 9 , Picture 10 Shown, where Picture 9 It is a schematic diagram of the light effect of all the lights, Picture 9 The picture on the left is the brightness of the LCD screen with all the lights on, and the right is the illuminance. Picture 9 The picture on the left shows that the backlight uniformity of this solution is poor. Picture 10 It is a schematic diagram of the light effect of half of the lights, by Picture 10 The picture on the left shows that the upper brightness and the lower brightness have more mixed areas, and the backlight contrast is not good.

[0113] The above three sets of experimental data show that the shape and size ratio of the groove 11 provided by this solution are superior to other solutions in terms of backlight uniformity and anti-interference.

[0114] In summary, the new reflective sheet with groove structure provided by the present invention is suitable for 3D TVs. After adopting the technical scheme of the present invention, the contrast of 3D TV display can be significantly improved, and the requirements for dynamic control of the backlight module area are improved. Dynamic area contrast and resolution.

[0115] After adopting the technical solution provided by the present invention, the utilization rate of the light source in the backlight module is significantly improved, the number of LED lamps can be greatly reduced, and the cost of parts procurement and the cost of the complete TV set can be reduced. At the same time, the three-dimensional foamed reflector makes use of the contraction of the light divergence angle of each foaming groove 11 to enhance the light effect in a small area of ​​each LED lamp, thereby making the entire light effect of the TV set. It can increase, improve user experience, enhance the market competitiveness and added value of products, and bring more benefits to production enterprises.

[0116] At the same time, the solution provided by the present invention also shortens the light mixing distance, reduces the thickness of the backlight module, and at the same time greatly reduces the thickness of the entire TV set, which is more suitable for manufacturing ultra-thin TV sets.

[0117] In addition, the technical solution can better meet the requirements of 3D display for dynamic control of the backlight module area, improve the contrast and resolution of the dynamic area, and improve the overall performance of the 3D TV.

[0118] In summary, the technical solution provided by the present invention has significantly improved the comprehensive competitiveness of TV products and has made significant progress.

[0119] The television provided by the present invention has the following technical effects: in a small area of ​​each LED lamp, the light-emitting angle of the LED lamp is restricted by the groove, which effectively improves the light energy utilization rate. At the same time, it is also possible to control the distribution of energy in various directions by controlling the shape of the groove, which increases the freedom of arrangement of the LED lights to a certain extent. The restraining effect of the groove on the light source can also solve the problem of insufficient light mixing to a certain extent, change the subjective light shadow problem of ordinary direct-lit backlight modules, and make the TV set thinner, more beautiful in appearance, and can be compared It satisfies the requirements of 3D display for dynamic control of the backlight module area, improves the contrast and resolution of the dynamic area, and improves the overall performance of the 3D TV. .