WO2021238906A1

WO2021238906A1 - Backlight structure and lcd display module

Info

Publication number: WO2021238906A1
Application number: PCT/CN2021/095754
Authority: WO
Inventors: 王秋里; 陈雷; 汪志强; 马鑫; 孙川; 姚建峰; 王新宇; 谭丁炀
Original assignee: 京东方科技集团股份有限公司; 北京京东方光电科技有限公司
Priority date: 2020-05-27
Filing date: 2021-05-25
Publication date: 2021-12-02
Also published as: CN111474624A

Abstract

A backlight structure (100) and an LCD display module, the backlight structure (100) comprising: a light guide plate (1); a plurality of light sources (2); a first prism piece (3), the first prism piece (3) and the light guide plate (1) being stacked and spaced apart, and the first prism piece (3) comprising a first substrate (31) and a plurality of first protrusions (32); and a second prism piece (4), the second prism piece (4) and the first prism piece (3) being stacked and spaced apart, the second prism piece (4) being located on a side of the first prism piece (3) far from the light guide plate (1), the second prism piece (4) comprising a second substrate (41) and a plurality of second protrusions (42), and a surface of the second substrate (41) near to the first prism piece (3) being provided with a haze layer (5). Hence, the haze layer (5) can be located on a side of the second prism piece (4) far from the human eyes. Relative to the haze layer (5) being located at the near-eye side, the degree of light divergence is smaller on a fixed receiving surface, and insufficient light homogenization caused by a conventional inverse prism haze layer on the near-eye side, as well as after passing through a magnifying system, the light being close to the contour thereof, thereby causing roughness of image quality can be avoided.

Description

Backlight structure and LCD display module

Cross-references to related applications

This application claims the priority of Chinese patent application No. 202010460358.8 submitted to the China Intellectual Property Office on May 27, 2020, and the disclosed content is incorporated herein by reference.

Technical field

The present disclosure relates to the technical field of LCD display modules, and in particular to a backlight structure and LCD display modules.

Background technique

In related technologies, the directional backlight has the advantages of light output brightness, viewing angle, and forward light brightness. In recent years, it has been used in vehicle high-brightness displays, notebook privacy displays, and VR (Virtual Reality, virtual reality technology) high-brightness. Display and other aspects are more and more used. Inverse prisms and matching LGP (light guide plates) are the most commonly used directional backlight solutions. Haze is often introduced to homogenize the light and play a role in shielding film surface defects and defects. In the inverse prism and matching LGP directional backlight, the haze layer is close to the eye-entry side, and the haze layer is a micron or sub-micron uneven layer to achieve the overall divergence of light at a certain angle, thereby homogenizing the light and reducing The visibility of surface defects such as prism sheet and LGP improves the picture quality. When this directional backlight is applied to an optical visual system (such as VR) with optical magnification, the light diverges from the topography of the haze layer and is magnified, but because it is close to the side of the human eye, the light intensity of the picture becomes higher. Close to the surface morphology of the haze layer, the image quality is very grainy.

Public content

The present disclosure aims to solve at least one of the technical problems existing in the prior art. For this reason, the present disclosure proposes a backlight structure, which can effectively improve the graininess of the haze layer after being amplified by the optical system.

The present disclosure also provides an LCD display module, which includes the above-mentioned backlight structure.

The backlight structure according to the embodiment of the present disclosure includes: a light guide plate; a light source provided on the side of the light guide plate; a first prism sheet, the first prism sheet and the light guide plate are stacked and spaced apart, The first prism sheet includes a first substrate and a plurality of first protrusions, the plurality of first protrusions are provided on a side of the first substrate away from the light guide plate, and each of the first protrusions is The length direction of the side wall of the light guide plate extends, the arrangement direction of the plurality of first protrusions is perpendicular to the extending direction of each of the first protrusions; the second prism sheet, the second prism sheet and The first prism sheets are stacked and spaced apart, the second prism sheet is located on a side of the first prism sheet away from the light guide plate, and the second prism sheet includes a second substrate and a plurality of second substrates. Protrusions, a plurality of the second protrusions are provided on a side of the second substrate away from the first prism sheet, each of the second protrusions extends in the same direction as the first protrusions, The arrangement direction of the plurality of second protrusions is the same as the arrangement direction of the plurality of first protrusions, and a haze layer is provided on the surface of the second substrate close to the first prism sheet.

According to the backlight structure of the embodiment of the present disclosure, by arranging the haze layer on the side of the second prism sheet close to the first prism sheet, the haze layer can be positioned on the side of the second prism sheet away from the human eye, thereby making The degree of light dispersion after passing through the haze layer is better, which can effectively improve the graininess of the haze layer after being magnified by the optical system and improve the picture quality. In addition, the second protrusions on the second prism sheet are located on the side of the second substrate away from the first prism sheet, which facilitates the setting of the haze layer, and the provision of two prism sheets, the first prism sheet and the second prism sheet, can make light The final injection angle meets the demand, and the structure is simple.

According to some embodiments of the present disclosure, the light source includes a plurality of light sources arranged at intervals along the length direction of the side wall of the light guide plate.

According to some embodiments of the present disclosure, the thickness of the first substrate is d1, the thickness of the second substrate is d2, d1≥65 μm, and d2≥65 μm.

In some embodiments of the present disclosure, d1+d2≤250 μm.

In some embodiments of the present disclosure, the thickness of the first substrate and the thickness of the second substrate satisfy: d1=d2.

According to some embodiments of the present disclosure, the cross section of the first protrusion is triangular, and there is one side on the surface of the first substrate away from the light guide plate, and the cross section of the second protrusion is It is triangular, and one side is located on the surface of the second substrate away from the first prism sheet.

In some embodiments of the present disclosure, the first protrusion includes a first surface close to the light source and a second surface away from the light source, and the second protrusion includes a third surface close to the light source and The fourth surface away from the light source, after the light emitted from the light guide plate enters the first prism sheet, it exits from the second surface and enters the second prism sheet, and then from the fourth surface The angle between the first surface and the first substrate is β, the angle between the second surface and the first substrate is α, and the angle between the third surface and the second substrate is α1, The angle between the third surface and the second substrate is α2, the incident angle of the light entering the first prism sheet is θ2, and the corresponding refraction angle is θ3, the light emitted from the first prism sheet is emitted The angle is θ4, the corresponding refraction angle is θ5, the incident angle of the light entering the second prism sheet is θ6, the corresponding refraction angle is θ7, and the exit angle of the light emitted from the second prism sheet is θ8, which corresponds to The refraction angle is θ9, where α1 and β are set angles, the ridgeline between the first surface and the second surface is the first ridgeline, and the third surface and the fourth surface are The ridgeline between the two is the second ridgeline, the distance between the two adjacent first ridgelines is the first set value, and the distance between the two adjacent second ridgelines is the second A set value, the height of the first ridgeline from the first substrate is a first set height value, and the height of the second ridgeline from the second substrate is a second set height value.

In some embodiments of the present disclosure, the first setting value is 24 μm.

In some embodiments of the present disclosure, the second setting value is 16-18 μm.

In some embodiments of the present disclosure, the β is 90°～θ3.

In some embodiments of the present disclosure, the α1 is 90°～θ7.

In some embodiments of the present disclosure, the haze of the haze layer is 20%-40%.

In some embodiments of the present disclosure, the light source is an LED lamp.

The LCD display module according to the embodiment of the present disclosure includes the above-mentioned backlight structure.

According to the LCD display module of the embodiment of the present disclosure, by arranging the haze layer on the side of the second prism sheet close to the first prism sheet, the haze layer can be positioned on the side of the second prism sheet away from the human eye. Therefore, the degree of dispersion of light after passing through the haze layer is better, and the graininess phenomenon of the haze layer after being magnified by the optical system can be effectively improved, and the picture quality is improved. In addition, the second protrusions on the second prism sheet are located on the side of the second substrate away from the first prism sheet, which facilitates the setting of the haze layer, and the provision of two prism sheets, the first prism sheet and the second prism sheet, can make light The final injection angle meets the demand, and the structure is simple.

The additional aspects and advantages of the present disclosure will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present disclosure.

Description of the drawings

The above and/or additional aspects and advantages of the present disclosure will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a perspective view of a backlight structure according to an embodiment of the present disclosure;

Figure 2 is a front view of a backlight structure according to an embodiment of the present disclosure;

FIG. 3 is a partial structural diagram of a first prism sheet of a backlight structure according to an embodiment of the present disclosure;

4 is a schematic diagram of a partial structure of a second prism sheet of a backlight structure according to an embodiment of the present disclosure;

5 is a front view of a backlight structure and a schematic diagram of light paths according to an embodiment of the present disclosure;

Fig. 6 is a front view and a multi-path light path diagram of a backlight structure according to an embodiment of the present disclosure.

Fig. 7 is a schematic diagram of light emitted from a light guide plate of a backlight structure according to an embodiment of the present disclosure;

8 is a schematic diagram of light emitted by the first prism sheet of the backlight structure according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of light emitted from a second prism sheet of a backlight structure according to an embodiment of the present disclosure.

Reference signs:

Backlight structure 100,

Light guide plate 1,

Light source 2,

The first prism sheet 3, the first substrate 31, the first protrusions 32, the first surface 321, the second surface 322, the first ridge line 323,

The second prism sheet 4, the second substrate 41, the second protrusion 42, the third surface 421, the fourth surface 422, the second ridge line 423,

Haze layer 5.

Detailed ways

The embodiments of the present disclosure are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present disclosure, and cannot be understood as a limitation to the present disclosure.

In the description of the present disclosure, it should be understood that the terms "length", "height", "upper", "lower", "front", "rear", "left", "right", etc. indicate the orientation or position The relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore It cannot be understood as a limitation of the present disclosure. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

Hereinafter, a backlight structure 100 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 6.

As shown in FIGS. 1 and 2, the backlight structure 100 according to an embodiment of the present disclosure includes a light guide plate 1, a light source 2, a first prism sheet 3 and a second prism sheet 4.

Specifically, as shown in FIGS. 1 and 2, the light source 2 is provided on the side of the light guide plate 1 and arranged along the length direction of the corresponding side wall of the light guide plate 1. Under the action of the light guide plate 1, light is uniformly emitted from the front surface of the light guide plate 1, as shown in FIG. 1.

The first prism sheet 3 and the light guide plate 1 are stacked and spaced apart. The first prism sheet 3 includes a first substrate 31 and a plurality of first protrusions 32. The plurality of first protrusions 32 are provided on the first substrate 31 away from the guide plate. On one side of the light plate 1, each first protrusion 32 extends along the length direction of the side wall of the light guide plate, as shown in FIG. The extension direction of the first protrusions 32 is vertical, and the first prism sheet 3 can deflect the light emitted from the light guide plate 1 to a certain angle in a direction perpendicular to the light guide plate 1. The second prism sheet 4 and the first prism sheet 3 are stacked and spaced apart. The second prism sheet 4 is located on the side of the first prism sheet 3 away from the light guide plate 1. The second prism sheet 4 includes a second substrate 41 and a plurality of The second protrusion 42, a plurality of second protrusions 42 are provided on the side of the second substrate 41 away from the first prism sheet 3, and the extension direction of each second protrusion 42 is the same as that of the first protrusion 32. The arrangement direction of the second protrusions 42 is the same as the arrangement direction of the plurality of first protrusions 32, and the second prism sheet 4 can deflect the light emitted from the first prism sheet 3 according to the required light direction.

As shown in FIG. 1, a haze layer 5 is provided on the surface of the second substrate 41 close to the first prism sheet 3, so that the haze layer 5 can be located on the side of the second prism sheet 4 far away from the human eye. The haze layer 5 is located near the eye, and the light diverges less on the fixed receiving surface. This can prevent the conventional inverse prism haze layer from causing insufficient light homogenization on the near-eye side, and the light is close to its own contour after passing through the magnification system, which causes the phenomenon of coarse particles of image quality. In the present application, the haze layer 5 is far away from the side of human eyes, and the degree of dispersion of light after passing through the haze layer 5 is a better homogenization effect.

Wherein, the light guide plate 1, the first substrate 31 and the second substrate 32 may be arranged in parallel.

According to the backlight structure 100 of the embodiment of the present disclosure, by arranging the haze layer 5 on the side of the second prism sheet 4 close to the first prism sheet 3, the haze layer 5 can be located on the second prism sheet 4 away from human eyes. Therefore, the light is dispersed better after passing through the haze layer 5, which can effectively improve the graininess of the haze layer 5 after being magnified by the optical system, and improve the picture quality. In addition, the second protrusions 42 on the second prism sheet 4 are located on the side of the second substrate 41 away from the first prism sheet 3, which facilitates the arrangement of the haze layer 5, and the arrangement of the first prism sheet 3 and the second prism sheet 4Two prism sheets can make the final emission angle of light meet the demand, and the structure is simple.

Optionally, for example, in the example shown in FIG. 1, a plurality of light sources 2 are arranged on the left side of the light guide plate 1 and arranged at intervals along the length direction of the left side wall of the light guide plate 1 (the front-rear direction as shown in FIG. 1). . The light from the multiple light sources 2 enters the light guide plate 1 from the corresponding side walls of the light guide plate 1.

In some embodiments of the present disclosure, as shown in FIG. 2, the thickness of the first substrate 31 is d1, the thickness of the second substrate 41 is d2, d1≧65 μm, and d2≧65 μm. In this way, the light can be better deflected, and the requirement of the light exit angle of the backlight structure 100 can be met.

Further, d1+d2≤250μm. In the related technology, the LCD for VR, 1000ppi is the mainstream resolution level, and the thickness of the inverse prism substrate is generally 250um to prevent the moiré visible under a 10x magnifying glass. In the present application, making d1+d2≦250 μm can make the thickness and macroscopic size of the backlight structure 100 of the present application smaller than that of the prior art backlight structure, and avoid the increase in the size of the device using the backlight structure 100.

Optionally, the thickness of the first substrate 31 and the thickness of the second substrate 41 satisfy: d1=d2. Therefore, the processing technology of the first substrate 31 and the second substrate 41 can be simplified, and the production efficiency can be improved. Of course, the present disclosure is not limited to this. The thickness of the first substrate 31 and the thickness of the second substrate 41 may also be different. For example, the thickness of the first substrate 31 is greater than the thickness of the second substrate 41, or the thickness of the first substrate 31 is smaller than that of the second substrate. The thickness of the substrate 41.

In some embodiments of the present disclosure, as shown in FIGS. 1 and 2, the cross section of the first protrusion 32 is triangular, and there is one side on the surface of the first substrate 31 away from the light guide plate 1, and the second protrusion 32 The cross section of the ridge 42 is triangular, and one side is located on the surface of the second substrate 41 away from the first prism sheet 3. Therefore, it is convenient for the light to be emitted through the surfaces of the first protrusion 32 and the second protrusion 42 and be deflected, thereby meeting the requirements of the light emitting angle of the backlight structure 100.

Further, as shown in FIGS. 2 to 4, the first protrusion 32 includes a first surface 321 close to the light source 2 and a second surface 322 away from the light source 2, and the second protrusion 42 includes a third surface 421 close to the light source 2. And the fourth surface 422 far away from the light source 2, after the light emitted from the light guide plate 1 enters the first prism sheet 3, it exits from the second surface 322 and enters the second prism sheet 4, and then exits from the fourth surface 422. One surface 321 and the first base; 62 the angle of the plate 31 is β, the angle of the second surface 322 and the first substrate 31 is α, the angle of the third surface 421 and the second substrate 41 is α1, the third surface 421 and the The angle of the second substrate 41 is α2, the incident angle of the light entering the first prism sheet 3 is θ2, the corresponding refraction angle is θ3, the exit angle of the light emitted from the first prism sheet 3 is θ4, and the corresponding refraction angle is θ5 , The incident angle of the light entering the second prism sheet 4 is θ6, the corresponding refraction angle is θ7, the exit angle of the light emitted from the second prism sheet 4 is θ8, and the corresponding refraction angle is θ9,

According to the principle of refraction

sinθ3=sinθ2/n (1)

θ4=θ3-α (2)

sinθ5=n*sinθ4 (3)

θ6=θ5+α (4)

sinθ6=n*sinθ7 (5)

θ8=α2-θ7 (6)

sinθ9=n*sinθ8 (7)

Among them, n is the refractive index of the prism material, α1 and β are set angles, the ridgeline between the first surface 321 and the second surface 322 is the first ridgeline 323, and the third surface 421 and the fourth surface 422 are between The ridgeline of is the second ridgeline 423, the distance between two adjacent first ridgelines 323 is the first set value, and the distance between two adjacent second ridgelines 423 is the second set value Value, the height of the first ridgeline 323 from the first substrate 31 is the first set height value, and the height of the second ridgeline 423 from the second substrate 41 is the second set height value.

The final exit angle of the light is θ9. When θ9=α2, the light exits perpendicular to the prism surface. Therefore, the corresponding α2 can be adjusted according to the required light exit angle direction to achieve the same effect of non-gradual inverse prism backlight and gradient inverse prism backlight. Light effect.

In addition, after the material of the light guide plate 1 is determined, θ2 can be determined, and α can be obtained through the first setting value, the first setting height value, β and the above (1)-(7), so that the first convexity can be set reasonably. Starting from 32, so as to meet the requirements of the light-emitting angle of the backlight structure 100. In addition, in order to avoid too much stray light, as shown in Figure 5, the rightmost light, optionally, β can be 90°～θ3. It is understandable that β can vary between 90° and θ3, and 90 can be selected. An angle value between ° and θ3. This can better ensure that the light output angle meets the demand.

In addition, α2 can be obtained according to the second setting value, the second setting height value, α1, α, and the above (1)-(7), so that the second protrusion 42 can be reasonably set to meet the light output angle of the backlight structure 100 Require. In addition, in order to avoid too much stray light, as shown in Figure 5, the leftmost ray, optionally, α1 can be 90°～θ7. It is understandable that α1 can be changed between 90° and θ7, and 90 can be selected. An angle value between ° and θ7. This can better ensure that the light output angle meets the demand.

Optionally, the first set value is 24 μm. The second setting value is 16 to 18 μm. This can avoid the moiré phenomenon. Among them, the second set value can be 16.5 μm, 17 μm, 17.5 μm, or the like.

In addition, when the first setting value is 24 μm, in order to keep the height of the first prism sheet 3 and the second prism sheet 4 the same as the height of the conventional inverse prism, the inclination angle of the prism α=30° calculated according to the above formula; According to α=30° and vertical emission, α2=approximately 56° calculated according to formulas (1)-(7).

It should be noted that the appropriate solutions obtained according to formulas (1)-(7) are the design ideas of this scheme.

Optionally, the haze of the haze layer 5 is 20%-40%. As a result, the uniformity of the light dispersion after passing through the haze layer 5 can be improved, and the picture quality can be improved.

Optionally, the light source 2 is an LED lamp. The LED lamp has the advantages of energy saving, long life, can work in a high-speed state, good shock resistance, etc., so that the life span and working reliability of the backlight structure 100 can be improved.

The light deflection of the backlight structure 100 according to the embodiment of the present disclosure will be described below with reference to FIGS. 7-9, where the same θ9 and α2 are taken as an example for description.

Figure 7 is the tracking result after the light passes through the light guide plate 1; Figure 8 is the light exit result after the light passes through the first prism sheet 3, the light emitted from the light guide plate 1 is deflected by a certain angle in the direction perpendicular to the light guide plate 1; 9 is the light output result after the light passes through the second prism sheet 4, and the light exits substantially perpendicular to the light guide plate 1.

The LCD display module according to the embodiment of the present disclosure includes the above-mentioned backlight structure 100 and the LCD display screen, the LCD display screen and the backlight structure 100 are stacked, and the LCD display screen is located on the side of the second prism sheet 4 away from the first prism sheet 3 , The backlight structure 100 can provide a light source for the LCD display screen.

According to the LCD display module of the embodiment of the present disclosure, by arranging the haze layer 5 on the side of the second prism sheet 4 close to the first prism sheet 3, the haze layer 5 can be located on the side of the second prism sheet 4 away from people. One side of the eye, so that the light is dispersed better after passing through the haze layer 5, which can effectively improve the graininess of the haze layer 5 after being magnified by the optical system, and improve the picture quality. In addition, the second protrusions 42 on the second prism sheet 4 are located on the side of the second substrate 41 away from the first prism sheet 3, which facilitates the arrangement of the haze layer 5, and the arrangement of the first prism sheet 3 and the second prism sheet 4Two prism sheets can make the final emission angle of light meet the demand, and the structure is simple.

In the description of the present disclosure, it should be noted that, unless otherwise clearly defined and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, they can be fixed or detachable. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present disclosure can be understood in specific situations.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described by the examples or examples are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present disclosure have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and modifications can be made to these embodiments without departing from the principle and purpose of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

Claims

A backlight structure, including:

Light guide plate

A light source, which is arranged on the side of the light guide plate;

The first prism sheet, the first prism sheet and the light guide plate are stacked and spaced apart, the first prism sheet includes a first substrate and a plurality of first protrusions, and the plurality of first protrusions are arranged on On a side of the first substrate away from the light guide plate, each of the first protrusions extends along the length direction of the side wall of the light guide plate, and the arrangement direction of the plurality of first protrusions is the same as that of each The extension direction of each of the first protrusions is vertical;

The second prism sheet, the second prism sheet and the first prism sheet are stacked and spaced apart, the second prism sheet is located on the side of the first prism sheet away from the light guide plate, and the first prism sheet The two prism sheet includes a second substrate and a plurality of second protrusions, the plurality of second protrusions are provided on a side of the second substrate away from the first prism sheet, and each of the second protrusions The extending direction of the first protrusion is the same, the arrangement direction of the plurality of second protrusions is the same as the arrangement direction of the plurality of first protrusions, and the second substrate is close to the first A haze layer is provided on the surface of the prism sheet.
The backlight structure of claim 1, wherein the light source comprises a plurality of light sources arranged at intervals along the length direction of the side wall of the light guide plate.
The backlight structure according to claim 1, wherein the thickness of the first substrate is d1, and the thickness of the second substrate is d2, d1≧65 μm, and d2≧65 μm.
The backlight structure of claim 2, wherein d1+d2≤250μm.
4. The backlight structure of claim 2, wherein the thickness of the first substrate and the thickness of the second substrate satisfy: d1=d2.
The backlight structure according to claim 1, wherein the cross-section of the first protrusion is triangular, and there is one side on the surface of the first substrate away from the light guide plate, and the second protrusion The cross section of is triangular, and there is one side on the surface of the second substrate away from the first prism sheet.
The backlight structure according to claim 4, wherein the first protrusion includes a first surface close to the light source and a second surface away from the light source, and the second protrusion includes a first surface close to the light source. On three sides and the fourth side far away from the light source, the light emitted from the light guide plate enters the first prism sheet, then exits from the second surface and enters the second prism sheet, and then from the The fourth surface is emitted, the angle between the first surface and the first substrate is β, the angle between the second surface and the first substrate is α, and the angle between the third surface and the second substrate Is α1, the angle between the third surface and the second substrate is α2, the incident angle of light entering the first prism sheet is θ2, and the corresponding refraction angle is θ3. The exit angle of the light is θ4, the corresponding refraction angle is θ5, the incident angle of the light entering the second prism sheet is θ6, the corresponding refraction angle is θ7, and the exit angle of the light exiting the second prism sheet is θ8, the corresponding refraction angle is θ9, where α1 and β are set angles, the ridgeline between the first surface and the second surface is the first ridgeline, and the third surface and the second surface are The ridgeline between the four sides is the second ridgeline, the distance between two adjacent first ridgelines is the first set value, and the distance between two adjacent second ridgelines Is the second set value, the height of the first ridgeline from the first substrate is the first set height value, and the height of the second ridgeline from the second substrate is the second set The height value.
The backlight structure of claim 6, wherein the first set value is 24 μm.
The backlight structure according to claim 6, wherein the second setting value is 16-18 μm.
The backlight structure according to claim 6, wherein the β is 90° to θ3.
The backlight structure according to claim 6, wherein the α1 is 90° to θ7.
The backlight structure according to any one of claims 1-10, wherein the haze of the haze layer is 20%-40%.
The backlight structure according to any one of claims 1-10, wherein the light source is an LED lamp.
An LCD display module, comprising the backlight structure according to any one of claims 1-12.