TW202303240A - Direct-type backlight module and display thereof - Google Patents

Abstract

The present invention is a direct-type backlight module and display thereof. The display includes a liquid crystal panel and a direct-type backlight module. The direct-type backlight module includes a lamp panel, a plurality of light-emitting elements, a plurality of reflective structures. Each light-emitting element is arranged on the lamp panel. Each reflecting structure system is respectively arranged around one of the light-emitting elements. Each reflecting structure includes a three-dimensional quadrilateral unit and a three-dimensional curved unit. The bottom of each three-dimensional curved unit is provided with an opening. Each light-emitting element is arranged in the opening. The focal point of the curve of each three-dimensional curved surface unit needs to pass through the center line of each light-emitting element in the upward direction. The top of each three-dimensional curved unit forms a quadrilateral. Each three-dimensional quadrilateral unit is set on the top of each reflective structure. Each reflective structure can support a light guide layer, improve the luminous efficiency and luminous uniformity, and reduce the halo effect.

Description

Direct-lit backlight module and its display

The invention relates to a backlight module, in particular to a direct type backlight module and a display thereof.

Liquid crystal display technology is a very important part of today's display technology, and products based on its technology also cover a wide range of applications, such as computers, televisions and mobile phones. The liquid crystal display device is mainly composed of a backlight module and a liquid crystal panel; the backlight module is used to provide a light source, and through an optical element (such as a light guide element), the light is uniformly transformed, and then used by the liquid crystal panel.

The types of backlight modules can be divided into direct-type and edge-type backlight modules according to the location of the light source. The direct-type backlight module is a design in which the light source is placed at the bottom of the module. The direct-type backlight module includes an optical material layer and a direct-type lamp panel. The optical material layer further includes an upper diffusion sheet and an upper brightness enhancement sheet from top to bottom. , Lower brightening sheet, Lower diffusion sheet.

With the effect of the optical material layer, the light source of the direct-lit lamp panel will be evenly distributed behind the liquid crystal panel, so it can obtain better uniformity of light transmission, better color contrast and more light and dark parts than the side-lit lamp panel detail. In addition, the direct-lit backlight module can be further designed with local dimming technology. The local dimming technology mainly arranges the light sources on the backplane in a matrix, and adjusts the current of the light sources individually, and further adjusts the luminance of small blocks; thus, the direct-type backlight module can be adjusted to different degrees in different areas. The effect of brightness changes.

However, the current direct-lit backlight modules have the following problems:

1. The direct-lit backlight module with local dimming technology can improve the picture contrast, but the light and dark junction of a single light source of this type of product often produces a halo effect (halo effect), which in turn affects the viewing experience .

2. In order to increase the performance of reflected light and improve the overall luminance (or brightness, unit: cd/m ² ) of the direct-type backlight module, please refer to Figure 1. The direct-type backlight module 1 includes a frame 10, glue Frame 12, optical material layer 14, light guide layer 16 (or light mixing layer) and direct-type lamp board 18, wherein the plastic frame 12 is arranged around the frame 10, and the direct-type lamp board 18 is arranged on the bottom of the frame 10 on the glue Inside the frame 12, the optical material layer 14 and the light guide layer 16 are stacked sequentially from top to bottom around the top of the plastic frame 12, but the optical material layer 14 and the light guide layer 16 are across the plastic frame 12. Around the top, the optical material layer 14 and the light guide layer 16 have no other supporting points in the middle of the plastic frame 12, so that the optical material layer 14 and the light guide layer 16 are deformed by force (gravity), causing the direct type lamp panel 18 to The light mixing distance OD between the light guide layers 16 is insufficient. In order to solve this problem, please refer to FIG. There is enough light mixing distance OD. That is to say, the overall thickness of the direct-lit backlight module 1 needs to be increased, which is contrary to the thinning design trend of liquid crystal display devices.

3. Please refer to FIG. 3 , there are a plurality of light-emitting elements 180 (usually light-emitting diodes) on the direct-lit lamp panel 18, but the light sources of each light-emitting element 180 are scattered, which makes the light utilization efficiency poor. In order to solve the problem of poor light utilization, as shown in Figures 4 and 5, a three-dimensional reflection structure 19 is arranged around each light-emitting element 180 of the direct-down lamp panel 18, and the light of each light source is concentrated upward through the three-dimensional reflection structure 19 to achieve The purpose of increasing luminous efficiency.

However, the light guide layer 16 covers the top of each three-dimensional reflective structure 19, causing the light around the light-emitting element 180 to form diffuse reflection light (as shown in FIG. (-12,-4, 4 and 12 mm positions as shown in Figure 7) the light brightness drops a lot (as shown in Figure 8). Therefore, how to make the three-dimensional reflective structures 19 support the light guide layer 16 and reduce the thickness, while improving the luminous efficiency and reducing the halo effect is an urgent problem to be solved at present.

In view of the problems of the prior art, one purpose of the present invention is to design the three-dimensional reflection structure in the direct-light lamp panel, reduce the problem of diffuse reflection light formed by the light guide layer, and adjust the concentrated upward output of the light, and at the same time make each three-dimensional reflection structure support Light guide layer, and reduce the overall thickness, and improve the luminous efficiency, can also reduce problems such as halo effect.

According to one object of the present invention, it is to provide a direct-lit backlight module, which includes a lamp board, a plurality of light-emitting elements, and a plurality of reflective structures. Around a light-emitting element, each reflective structure includes a three-dimensional quadrilateral unit and a three-dimensional curved surface unit, wherein each three-dimensional curved surface unit is provided with an opening at the bottom, and each light-emitting element is accommodated in the center of the opening. The top of each three-dimensional curved surface unit forms a quadrilateral, and each three-dimensional curved surface The focal points of all the curves of the units pass through the centerlines of the light-emitting elements, and the three-dimensional quadrilateral units are arranged on the tops of the three-dimensional curved surface units.

Among them, each three-dimensional curved surface unit is provided with a first curved surface between the central point of the respective light-emitting element and each side of the quadrilateral at the top, and each three-dimensional curved surface unit is from the central point of the respective light-emitting element to each side of the quadrilateral at the top. A second curved surface is respectively provided between any two adjacent first curved surfaces at the corners, and each first curved surface is along the first direction and the second direction from the center point of the light-emitting element to the middle point of each side of the top quadrilateral Symmetrical, and the first direction and the second direction are perpendicular to the plane on the side of the lamp board where the light-emitting element is installed, and each second curved surface is symmetrical to the diagonal of each corner of the quadrilateral from the center point of the light-emitting element to the top.

Wherein, each first curved surface is formed by a three-dimensional curve or a parabola.

Wherein, each second curved surface is formed by a three-dimensional curve or a parabola.

Wherein, the width of the quadrilateral at the top of each three-dimensional curved surface unit is equal to the distance between the center points of any two light-emitting elements.

距離的位置的法線，與發光元件的最大發光角度的延伸線相交的位置為第一相交點，從第一相交點沿法線到燈板設置發光元件的一面之間的距離，亦即為各立體曲面單元之底面到頂面的距離，各立體曲面單元之底面到頂面的距離為第二高度，第一高度係小於第二高度。 Wherein, the distance between the bottom and the top of the three-dimensional quadrilateral unit is the first height. Also, the central point of the light emitting element extends outwards to the width of the quadrilateral along one of the first direction or the second direction.

The normal line of the position of the distance intersects with the extension line of the maximum light-emitting angle of the light-emitting element as the first intersection point, and the distance from the first intersection point along the normal line to the side of the light panel where the light-emitting element is set is The distance from the bottom surface to the top surface of each three-dimensional curved surface unit is the second height, and the first height is smaller than the second height.

Wherein, the intersection point of the center point of the light-emitting element along the normal line to the position of each corner and the horizontal line of the height of each three-dimensional curved surface unit is the second intersection point.

Among them, between each side of the quadrilateral at the top of each three-dimensional curved surface unit and a modification distance from each corner, it is any point on the same level as the first intersection point to the central point of the light-emitting element to form all the three-dimensional surfaces of the first curved surface. The focus of the curve or parabola falls on the center line of the light emitting element.

Wherein, each corner of the quadrilateral at the top of each three-dimensional surface unit extends to any point on the same level as the second intersection point between the modified distances and the center point of the light-emitting element to form the focus of all three-dimensional curves or parabolas on the second curved surface. falls on the centerline of the light emitting element.

Wherein, the modification distance is greater than or equal to 0.1 millimeter (mm).

Wherein, the opening matches the shape of the light-emitting element, and the size of the opening is 0.1 millimeter (mm) outward from the edge of the light-emitting element.

According to an object of the present invention, another display is provided, comprising a liquid crystal panel, an optical material layer, a light guide layer and the aforementioned direct-lit backlight module which are sequentially stacked from top to bottom.

According to the above, each reflective structure can support the light guide layer, and through the shape design of the first curved surface and the second curved surface, each reflective structure can concentrate and emit the light of the light-emitting element upwards. In addition, each reflective structure The body uses each three-dimensional quadrilateral unit system to recycle the light diffused outward by each three-dimensional curved surface unit into each three-dimensional curved surface unit, so as to improve luminous efficiency and uniformity of luminous light, and reduce the halo effect.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

Please refer to FIG. 9 , the present invention is a direct-lit backlight module, including a lamp panel 2, a plurality of light-emitting elements 3, and a plurality of reflective structures 4. The structures 4 are respectively arranged around one of the light-emitting elements 3. Each reflective structure 4 includes a three-dimensional quadrilateral unit 40 and a three-dimensional curved surface unit 42 (as shown in FIGS. 10 and 11 ). Opening 420, each light-emitting element 3 is accommodated in the central position of opening 420, the top of each three-dimensional curved surface unit 42 forms a quadrilateral, and the focus P of all curves of each three-dimensional curved surface unit 42 passes through the center line CL of each light-emitting element 3, and each three-dimensional quadrilateral unit 40 is arranged on the top of each three-dimensional curved surface unit 42, and each three-dimensional quadrilateral unit 40 is recycled in each three-dimensional curved surface unit 42 (as shown in FIG. 12 ) by each three-dimensional curved surface unit 42. 4 It can support the light guide layer, improve the luminous efficiency and luminous uniformity, and reduce the halo effect.

In the present invention, please refer to FIG. 13 , each three-dimensional curved surface unit 42 is respectively provided with a first curved surface 422 between each side of the quadrilateral from the central point O of the respective light emitting element 3 to the top. The first ridgeline 4220 connected between any two first curved surfaces 422 is located at the position of the diagonal line of each three-dimensional curved surface unit 42. At this time, an included angle of 90 degrees will be formed between each first curved surface 422. The light at the joint position of any two first curved surfaces 422 will produce shadows and lines. Therefore, in order to make the joint position of any two first curved surfaces 422 gradually change as slowly as possible, thereby increasing the overall diffusion degree of the reflected light source, and not Because the right angle will cause excessive concentration of light sources, each three-dimensional curved surface unit 42 is respectively provided with a second curved surface 422 between any two adjacent first curved surfaces 422 from the center point O of the respective light emitting element 3 to each corner of the quadrilateral at the top. Curved surface 424, and each first curved surface 422 is symmetrical along the first direction and the second direction from the center point O of the light-emitting element 3 to the middle point of each side of the quadrilateral at the top, and the first direction and the second direction are in the light board 2 The side on which the light-emitting element 3 is placed is perpendicular to the plane, and each second curved surface 424 is symmetrical to the diagonal of each corner of the quadrilateral from the center point O of the light-emitting element 3 to the top.

What needs to be particularly stated here is that the first ridgeline 4220 drawn at the interface between any two first curved surfaces 422 in FIG. The second ridgeline 4240 drawn at the interface position is to express the position of each first curved surface 422 and each second curved surface 424 in the three-dimensional curved surface unit 42. In the actual implementation of the present invention, the first ridgeline 4220 and the second ridgeline do not exist. The reason for the second ridge line 4240 is that all the curves forming the second curved surface 424 are smooth in order to allow all the positions where each first curved surface 422 and each second curved surface 424 intersect. The line L drawn from the middle point of each side to the center point O of the light-emitting element 3 is used to illustrate the geometric relationship of each three-dimensional curved surface unit 42 , and there is no such line L in fact.

D。 In the present invention, as shown in FIG. 14 , each first curved surface 422 is formed by a three-dimensional curve or a parabola. Please refer to FIG. 15 , and each second curved surface 424 is formed by a three-dimensional curve or a parabola. And the width D of the quadrilateral at the top of each three-dimensional curved surface unit 42 is equal to the distance between the center points O of any two light-emitting elements 3, and the diagonal of the quadrilateral at the top of each three-dimensional curved surface unit 42 is

d.

距離的位置的法線，與發光元件3的最大發光角度(如圖16所示)的延伸線相交的位置為第一相交點CP1，從第一相交點CP1沿法線到燈板2設置發光元件3的一面之間的距離，亦即為各立體曲面單元42之底面到頂面的距離，各立體曲面單元42之底面到頂面的距離為第二高度H2，且第一高度H1係小於第二高度H2。 In the present invention, please refer to FIG. 14 again, the distance between each three-dimensional quadrilateral unit 40 from the bottom to the top is the first height H1, and the central point O of the light emitting element 3 is outward along one of the first direction or the second direction. extends to the width D of the quadrilateral

The normal line of the position of the distance intersects with the extension line of the maximum light-emitting angle of the light-emitting element 3 (as shown in FIG. 16 ) is the first intersection point CP1, and the light is set from the first intersection point CP1 to the lamp panel 2 along the normal line The distance between one side of the element 3, that is, the distance from the bottom surface to the top surface of each three-dimensional curved surface unit 42, the distance from the bottom surface to the top surface of each three-dimensional curved surface unit 42 is the second height H2, and the first height H1 is smaller than the second height H1. Height H2.

In the present invention, between each side of the quadrilateral at the top of each three-dimensional curved surface unit 42 and a modification distance MD from each corner, it is any point on the same level as the first intersection point CP1 to the center point O of the light emitting element 3 The focal points P of all the three-dimensional curves or parabolas forming the first curved surface 422 fall on the center line CL of the light emitting element 3, so that the light emitted by the light emitting element 3 is projected on any position of the first curved surface 422, and the light will emit light in parallel The direction of the centerline CL of the element 3 projects out.

In the present invention, please refer to FIG. 15 again, the intersection point of the center point O of the light-emitting element 3 along the normal line to the position of each corner, and the horizontal line of the height of each three-dimensional curved surface unit 42 is the second intersection point CP2 . And each corner of the quadrilateral at the top of each three-dimensional curved surface unit 42 extends to any point on the same level as the second intersection point CP2 between the modified distance MD to all the three-dimensional curves of the second curved surface 424 formed by the center point O of the light emitting element 3 Or the focus P of the parabola falls on the center line CL of the light emitting element 3, so that the light emitted by the light emitting element 3 is projected to any position of the second curved surface 424, and the light will be projected in a direction parallel to the center line CL of the light emitting element 3 .

In the present invention, the modification distance MD is greater than or equal to 0.1 millimeter (mm). The opening 420 matches the shape of the light emitting element 3 , and the size of the opening 420 is 0.1 millimeter (mm) outward from the edge of the light emitting element 3 .

In order to further understand that the present invention can indeed improve the brightness of light around each reflective structure 4, an optical simulation is performed with the direct-type backlight module of the present invention and the traditional direct-type backlight module of the same size, please refer to the figure As shown in 17, each reflective structure 4 of the traditional direct-type backlight module has only the first curved surface 422, and there is no three-dimensional quadrilateral unit 40, each traditional reflective structure 4 is in the first direction (X of the surface of the lamp panel 2 axis direction) at about 15, 48, 81, and 114 millimeters, and the edges of the traditional reflection structures 4 in the second direction (the Y-axis direction of the surface of the lamp panel 2) are also at about 15, 48 millimeters , 81, and 114 millimeters, as shown in FIG. 18 , the brightness of the edges of each reflective structure 4 in the first direction and the second direction is approximately less than the relative brightness of 0.4, and the overall average relative brightness is 0.63.

Please refer to Fig. 19, and the edges of each reflective structure 4 of the present invention in the first direction (the X-axis direction of the surface of the lamp panel 2) are also approximately located at positions of 15, 48, 81, and 114 millimeters, and The edges of each reflective structure 4 in the second direction (the Y-axis direction of the surface of the lamp panel 2) are also approximately located at positions of 15, 48, 81, and 114 millimeters, as shown in FIG. The brightness of the edge in the first direction and the second direction is about 0.4 times greater than the relative brightness, and the overall average relative brightness is 0.69, which is about 11% higher than the traditional direct-lit backlight module. In other words, the present invention can indeed improve the traditional direct-lit backlight module. Type backlight module problem.

Please refer to FIG. 21 , the present invention is a kind of display, including a direct type backlight module 5, a light guide layer 6, an optical material layer 7 and a liquid crystal panel 8, wherein the light guide layer 6 is arranged on the direct type backlight module 5 The side of the light-emitting element 3 projecting light, the optical material layer 7 is stacked on the side of the light guide layer 6 facing away from the direct type backlight module 5, and the liquid crystal panel 8 is arranged on the optical material layer 7 facing away from the light guide Layer 6 side.

In the present invention, the optical material layer 7 may also include an upper diffusion sheet, an upper brightness enhancement sheet, a lower brightness enhancement sheet, and a lower diffusion sheet from top to bottom as described in the prior art. One side of the direct-type backlight module 5 is incident into the light guide layer 6, and the light is uniformly diffused by the light guide layer 6 and then emitted from the surface of the light guide layer 6, and again the light is uniformly distributed by the upper diffuser and the lower diffuser. Spread out. However, the directivity of the light emitted through the upper and lower diffusers is poor, while the upper and lower brightness enhancement sheets are used to correct the direction of the light and condense the light to increase the use efficiency of the light after it is emitted from the diffusion plate, and the upper brightness enhancement sheet, The refraction of the lower brightness-enhancing sheet is perpendicular to the direction of the reflected light, which concentrates the light to increase the brightness.

To sum up, with the shape design of each three-dimensional curved surface unit 42, each reflective structure 4 can concentrate and emit the light of the light emitting element 3 upwards, and use each three-dimensional quadrilateral unit 40 to make the edges of each three-dimensional curved surface unit 42 outward The diffused light is recycled into each three-dimensional curved surface unit 42, which improves the luminous efficiency and uniformity of light emission, and reduces the halo effect. In addition, each three-dimensional quadrilateral unit 40 can support the light guide layer and the optical material layer, without additional plastic frames and The height of the frame does not increase the overall thickness, which meets the requirements of thinning liquid crystal displays.

The above detailed description is a specific description of the feasible embodiments of the present invention, but the foregoing embodiments are not intended to limit the patent scope of the present invention, and any equivalent implementation or change that does not depart from the technical spirit of the present invention shall be included in In the patent scope of this case.

D:對角線寬度 H1:第一高度 H2:第二高度 CP1:第一相交點 CP2:第二相交點 5:直下式背光模組 6:導光層 7:光學材料層 8:液晶面板 1: Direct-type backlight module 10: Frame 12: Plastic frame 14: Optical material layer 16: Light guide layer 18: Direct-type lamp board 180: Light-emitting element 19: Three-dimensional reflection structure OD: Light mixing distance 2: Light board 3: Light-emitting element 4: reflective structure 40: three-dimensional quadrilateral unit 42: three-dimensional curved surface unit 420: opening P: focus CL: center line O: center point 422: first curved surface 4220: first ridgeline 424: second curved surface 4240: second Ridge L: Line D: Width

D: diagonal width H1: first height H2: second height CP1: first intersection point CP2: second intersection point 5: direct type backlight module 6: light guide layer 7: optical material layer 8: liquid crystal panel

FIG. 1 is a schematic cross-sectional view of a conventional direct-lit backlight module. FIG. 2 is a schematic cross-sectional view of another conventional direct-lit backlight module. FIG. 3 is a schematic diagram of light projection of a conventional direct-lit backlight module. FIG. 4 is a schematic diagram of light projection of another conventional direct-lit backlight module. FIG. 5 is a schematic diagram of the appearance of the three-dimensional reflection structure in FIG. 4 . FIG. 6 is a schematic diagram of light projection in FIG. 5 . FIG. 7 is a schematic diagram of the measurement position of the direct type backlight module in FIG. 5 . FIG. 8 is a schematic diagram of the brightness of the direct type backlight module shown in FIG. 7 . Fig. 9 is an exploded schematic view of the three-dimensional appearance of the present invention. FIG. 10 is a schematic diagram of light projection of the reflective structure of the present invention. Fig. 11 is a schematic diagram of the three-dimensional appearance of the reflective structure of the present invention. Fig. 12 is an exploded schematic view of the reflective structure of the present invention. FIG. 13 is a schematic top view of the reflective structure of the present invention. Fig. 14 is a schematic diagram of a curve of the first curved surface of the present invention. Fig. 15 is a schematic diagram of the maximum light-emitting angle of the light-emitting element of the present invention. Fig. 16 is a schematic diagram of a curve of the second curved surface of the present invention. FIG. 17 is a schematic diagram of a measurement position of a conventional direct-lit backlight module. FIG. 18 is a schematic diagram of the luminous intensity distribution of the conventional direct-lit backlight module in FIG. 17 . FIG. 19 is a schematic diagram of the measuring position of the direct type backlight module of the present invention. FIG. 20 is a schematic diagram of the luminous intensity distribution of the conventional direct-lit backlight module of FIG. 18 . Fig. 21 is a schematic diagram of stacking of the liquid crystal display of the present invention.

2: light board

3: Light emitting element

4: Reflection structure

420: opening

5: Direct type backlight module

Claims (10)

A direct-lit backlight module, comprising: a light board; a plurality of light-emitting elements arranged on one side of the light panel; and A plurality of reflective structures, each of which is respectively arranged around one of the light-emitting elements, and each of which respectively includes: A three-dimensional curved surface unit, the bottom of the three-dimensional curved surface unit is provided with an opening, each of the light-emitting elements is accommodated in the central position of the opening, the top of each of the three-dimensional curved surface units forms a quadrangle, and the focal points of all the curves of each of the three-dimensional curved surface units pass through each of the three-dimensional curved surface units Lighting element centerline; and A three-dimensional quadrilateral unit, each of the three-dimensional quadrilateral units is arranged on the top of each of the three-dimensional curved surface units, and each of the three-dimensional quadrilateral units is used to recycle the light diffused outwardly by each of the three-dimensional curved surface units into each of the three-dimensional curved surface units. The direct-lit backlight module as described in claim 1, wherein each three-dimensional curved surface unit is provided with a first curved surface between each side of the quadrilateral from the center point of the respective light-emitting element to the top, and each three-dimensional curved surface unit is formed by its own From the center point of the light-emitting element to each corner of the quadrilateral at the top, a second curved surface is respectively provided between any two adjacent first curved surfaces, and each first curved surface is from the center point of the light-emitting element to each side of the quadrilateral at the top The middle point of the side is symmetrical along the first direction and the second direction, and the first direction and the second direction are perpendicular to the plane on the side where the light-emitting element is installed on the lamp board, and each second curved surface is a quadrilateral from the center point of the light-emitting element to the top The diagonals of the corners are symmetrical. The direct-lit backlight module according to claim 2, wherein each first curved surface is formed by a three-dimensional curve or a parabola. The direct type backlight module according to claim 3, wherein each second curved surface is formed by a three-dimensional curve or a parabola. The direct-lit backlight module according to claim 3, wherein the width of the quadrilateral at the top of each three-dimensional curved surface unit is equal to the distance between the centers of any two light-emitting elements. The direct-lit backlight module according to claim 3, wherein the distance between the bottom and the top of the three-dimensional quadrilateral unit is a first height, and the central point of the light-emitting element extends outward along one of the first direction or the second direction to the width of the quadrilateral

The normal line of the position of the distance intersects with the extension line of the maximum light-emitting angle of the light-emitting element as the first intersection point, and the distance from the first intersection point along the normal line to the side of the light panel where the light-emitting element is set is The distance from the bottom surface to the top surface of each three-dimensional curved surface unit is the second height, and the first height is smaller than the second height. The direct type backlight module according to claim 3, wherein the intersection point between the center point of the light-emitting element and the horizontal line of the height of each three-dimensional curved surface unit along the normal line to the position of each corner is the second intersection point. The direct-lit backlight module as described in claim 3, wherein the distance between each side of the quadrilateral at the top of each three-dimensional curved surface unit and a modification distance from each corner is any point on the same level as the first intersection point to the light emitting The focal points of all three-dimensional curves or parabolas formed by the center point of the element on the first curved surface fall on the center line of the light-emitting element. The direct-lit backlight module as described in Claim 3, wherein each corner of the quadrilateral at the top of each three-dimensional curved surface unit extends to any point on the same level as the second intersection point to the central point of the light-emitting element between the decoration distance The focal points of all solid curves or parabolas on the second curved surface fall on the central line of the light-emitting element. A display comprising: The direct-lit backlight module as described in any one of claim items 1 to 9; A light guide layer is arranged on the side where the light-emitting elements of the direct-lit backlight module project light; An optical material layer is stacked on the side of the light guide layer facing away from the reflective structure; A liquid crystal panel is arranged on the side of the optical material layer facing away from the light guide layer.

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