Composite membrane with special optical architecture

Abstract

A special optical framework composite film comprises a first prismatic lens, a second prismatic lens and a third prismatic lens. The first prismatic lens is provided with a first incident surface facing the light source emergent surface of the light source assembly and a first emergent surface opposite to the first incident surface. The second prismatic lens is provided with a second light incident surface facing the first light emergent surface, a second light emergent surface opposite to the second light incident surface, and a second prism layer and a second atomization layer which are positioned between the second light incident surface and the second light emergent surface and are overlapped with each other. The third prismatic lens is provided with a third incident surface facing the second emergent surface, a third emergent surface opposite to the third incident surface, a third prism layer and a third atomization layer, wherein the third prism layer and the third atomization layer are located between the third incident surface and the third emergent surface and are overlapped, and the haze of the third atomization layer is larger than that of the second atomization layer.

Description

Technical Field

[0001] The invention relates to a composite diaphragm, in particular to a composite diaphragm with a special optical structure. Background Art

[0002] See also Figure 1 and Figure 2 , a conventional backlight module 400 generally includes a light source assembly 401 and a composite film 402. The light source assembly 401 includes a light guide plate 401a, a reflective sheet 401b, and a light source 401c disposed on one side of the light guide plate 401a, and the light guide plate 401a has a light source light emitting surface 401d located at the top. The composite film 402 includes a lower diffusion sheet 402a, a lower prism sheet 402b, and an upper prism sheet 402c, which are stacked in sequence, and the lower diffusion sheet 402a is located between the light source light emitting surface 401d of the light source assembly 401 and the lower prism sheet 402b. The prism parts of the lower prism sheet 402b and the upper prism sheet 402c face away from the light source assembly 401 and face upward, and the extension directions of the prism parts of the lower prism sheet 402b and the upper prism sheet 402c are perpendicular to each other, and an upper haze layer 402d is provided on the bottom surface of the upper prism sheet 402c. The light source 401c provides the light energy required by the entire traditional backlight module 400, and is usually composed of a plurality of LEDs (Light emitting diodes) and arranged into a light bar, that is, a point light source is converted into a line light source, and after being incident on the light guide plate 401a from the side, the light passes through the light guide plate 401a and the reflective sheet 401b below the light guide plate 401a and turns to move upward to become a surface light source, and finally corrects the light travel path through the lower diffusion sheet 402a, the lower prism sheet 402b and the upper prism sheet 402c to achieve the optical effect required by the user. However, in order to achieve the purpose of concealing blemishes, the lower diffusion sheet 402a usually has a larger haze, resulting in the disadvantage of low overall brightness of the conventional backlight module 400. In addition, the conventional backlight module 400 has a larger light output viewing angle, which may not meet the needs of users in some situations. Summary of the invention

[0003] An object of the present invention is to provide a special optical structure composite film that can improve at least one problem in the prior art.

[0004] The special optical structure composite film described in the present invention is suitable for cooperating with a light source component, and the light source component has a light source light emitting surface. The special optical structure composite film includes a first prism sheet, a second prism sheet, and a third prism sheet. The first prism sheet has a first light incident surface facing the light source light emitting surface, and a first light emitting surface opposite to the first light incident surface. The second prism sheet has a second light incident surface facing the first light emitting surface, a second light emitting surface opposite to the second light incident surface, and a second prism layer and a second haze layer located between and overlapping the second light incident surface and the second light emitting surface. The third prism sheet has a third light incident surface facing the second light emitting surface, a third light emitting surface opposite to the third light incident surface, and a third prism layer and a third haze layer located between and overlapping the third light incident surface and the third light emitting surface. The haze of the third haze layer is greater than the haze of the second haze layer.

[0005] In some implementations, the haze of the third atomized layer is 0.5% to 30%, and the haze of the second atomized layer is 1% to 20%.

[0006] In some implementations, the haze of the third atomized layer is 10% to 50%, and the haze of the second atomized layer is 1% to 20%.

[0007] In some embodiments, the third prism layer has a third base, and a third prism portion disposed on one side of the third base and adjacent to the third light emitting surface, and the third haze layer is disposed on the other side of the third base and adjacent to the third light incident surface.

[0008] In some embodiments, the second prism layer has a second base, and a second prism portion disposed on one side of the second base and adjacent to the second light emitting surface, and the second haze layer is disposed on the other side of the second base and adjacent to the second light incident surface.

[0009] In some implementations, the prism tip angle of the first prism sheet is 50 to 120 degrees, the prism tip angle of the second prism sheet is 50 to 120 degrees, and the prism tip angle of the third prism sheet is 50 to 150 degrees.

[0010] In some implementations, the prism tip angle of the third prism sheet minus the prism tip angle of the second prism sheet is -1 to 80 degrees, and the prism tip angle of the third prism sheet minus the prism tip angle of the first prism sheet is -1 to 80 degrees.

[0011] In some embodiments, the first prism sheet further includes a first prism layer and a first haze layer that are located between and overlap the first light incident surface and the first light emitting surface, and the haze of the first haze layer is less than or equal to 20%.

[0012] In some embodiments, the first prism layer has a first base and a first prism portion disposed on one side of the first base and adjacent to the first light incident surface, and the first haze layer is disposed on the other side of the first base and adjacent to the first light emitting surface.

[0013] In some embodiments, the first prism sheet further includes a first prism layer, wherein the first prism layer includes a first base portion adjacent to the first light emitting surface, and a first prism portion disposed on one side of the first base portion and adjacent to the first light incident surface.

[0014] In some implementations, the special optical architecture composite film further includes an upper diffusion sheet disposed at the third light-emitting surface of the third prism sheet, and a haze of the upper diffusion sheet is less than or equal to 50%.

[0015] The beneficial effect of the present invention is that the second fog layer of the second prism sheet and the third fog layer of the third prism sheet, which are designed as dispersed fog layers, can effectively improve the overall average brightness of the backlight module composed of the light source assembly and the special optical structure composite film. In addition, the visible viewing angle of the light output of the backlight module is reduced to meet the needs of users in some situations and improve the optical visual texture of the overall backlight module. Furthermore, due to the design of this dispersed fog layer, the scratches of the second prism sheet and the third prism sheet during the assembly process can be reduced and a blemish-proof effect can be produced to improve the assembly yield of the special optical structure composite film. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0017] Figure 1 It is a side view schematic diagram of a conventional backlight module including a light source component and a composite film in the prior art;

[0018] Figure 2 is another side view schematic diagram of the composite film of the conventional backlight module in the prior art;

[0019] Figure 3 It is a side view schematic diagram of a backlight module composed of a first embodiment of a special optical structure composite film of the present invention and a light source assembly;

[0020] Figure 4 is another side view schematic diagram of the first embodiment viewed from another viewing angle;

[0021] Figure 5 is a side view schematic diagram of a second embodiment of the special optical structure composite film of the present invention and the backlight module composed of the light source assembly;

[0022] Figure 6 is another side view schematic diagram of the second embodiment viewed from another viewing angle;

[0023] Figure 7 This is a light type comparison diagram of the backlight module composed of the first embodiment and the second embodiment and the traditional backlight module in the prior art, wherein the horizontal axis is the viewing angle and the vertical axis is the brightness percentage compared to its own peak brightness. DETAILED DESCRIPTION

[0024] Before the present invention is described in detail, it should be noted that similar components are denoted by the same reference numerals in the following description.

[0025] See also Figure 3 and Figure 4 A first embodiment of the special optical structure composite film 100 of the present invention is suitable for forming a backlight module 300 in conjunction with a light source assembly 200. The light source assembly 200 includes a light guide plate 201 and a reflective sheet 202 stacked in an upper and lower arrangement, and a light source 203 disposed on one side of the light guide plate 201. The light guide plate 201 has a light source light emitting surface 201a located at the top. The special optical structure composite film 100 includes a first prism sheet 1, a second prism sheet 2, and a third prism sheet 3 stacked in sequence. The first prism sheet 1, the second prism sheet 2, and the third prism sheet 3 can be, for example, optical films made of polymer composite materials, and the refractive index can be between 1.4 and 1.7, but is not limited thereto.

[0026] The first prism sheet 1 has a first light incident surface 11 located at the bottom and facing the light source light emitting surface 201a, a first light emitting surface 12 located at the top and opposite to the first light incident surface 11, and a first prism layer 13 and a first haze layer 14 located between and overlapping the first light incident surface 11 and the first light emitting surface 12. The first prism layer 13 has a first base 131, and a first prism portion 132 disposed on the bottom surface of the first base 131 and adjacent to the first light incident surface 11. The prism tip angle of the first prism portion 132 of the first prism layer 13 of the first prism sheet 1 is preferably 50 to 120 degrees. In the first embodiment, the prism tip angle of the first prism portion 132 of the first prism layer 13 of the first prism sheet 1 is 90 degrees.

[0027] The first haze layer 14 is disposed on the top surface of the first base portion 131 and is adjacent to the first light emitting surface 12. The haze of the first haze layer 14 is preferably less than or equal to 20%. In the first embodiment, the haze of the first haze layer 14 is 10%. The bottom surface of the first prism portion 132 constitutes the first light incident surface 11, and the top surface of the first haze layer 14 constitutes the first light emitting surface 12.

[0028] The second prism sheet 2 has a second light incident surface 21 located at the bottom and facing the first light emitting surface 12, a second light emitting surface 22 located at the top and opposite to the second light incident surface 21, and a second prism layer 23 and a second haze layer 24 located between and overlapping the second light incident surface 21 and the second light emitting surface 22. The second prism layer 23 has a second base 231, and a second prism portion 232 disposed on the top surface of the second base 231 and adjacent to the second light emitting surface 22. The prism tip angle of the second prism portion 232 of the second prism layer 23 of the second prism sheet 2 is preferably 50 to 120 degrees. In the first embodiment, the prism tip angle of the second prism portion 232 of the second prism layer 23 of the second prism sheet 2 is 60 degrees.

[0029] The second haze layer 24 is disposed on the bottom surface of the second base portion 231 and is adjacent to the second light incident surface 21. The haze of the second haze layer 24 is preferably 1% to 20%. In the first embodiment, the haze of the second haze layer 24 is 10%. The bottom surface of the second haze layer 24 constitutes the second light incident surface 21, and the top surface of the second prism portion 232 constitutes the second light emitting surface 22.

[0030] The third prism sheet 3 has a third light incident surface 31 located at the bottom and facing the second light emitting surface 22, a third light emitting surface 32 located at the top and opposite to the third light incident surface 31, and a third prism layer 33 and a third haze layer 34 located between and overlapping the third light incident surface 31 and the third light emitting surface 32. The third prism layer 33 has a third base 331, and a third prism portion 332 disposed on the top surface of the third base 331 and adjacent to the third light emitting surface 32. The prism tip angle of the third prism portion 332 of the third prism layer 33 of the third prism sheet 3 is preferably 50 to 150 degrees. In the first embodiment, the prism tip angle of the third prism portion 332 of the third prism layer 33 of the third prism sheet 3 is 90 degrees (e.g. Figure 4Preferably, the prism tip angle of the third prism portion 332 of the third prism layer 33 minus the prism tip angle of the second prism portion 232 of the second prism layer 23 is -1 to 80 degrees. For example, in the first embodiment, the prism tip angle (90 degrees) of the third prism portion 332 of the third prism layer 33 minus the prism tip angle (60 degrees) of the second prism portion 232 of the second prism layer 23 is 30 degrees. The prism tip angle of the third prism portion 332 of the third prism layer 33 minus the prism tip angle of the first prism portion 132 of the first prism layer 13 is -1 to 80 degrees. For example, in the first embodiment, the prism tip angle (90 degrees) of the third prism portion 332 of the third prism layer 33 minus the prism tip angle (90 degrees) of the first prism portion 132 of the first prism layer 13 is 0 degree.

[0031] In the first embodiment, the extension directions of the first prism portion 132 and the second prism portion 232 are parallel, and the extension direction of the third prism portion 332 is perpendicular to the extension directions of the first prism portion 132 and the second prism portion 232. However, in other embodiments, the extension directions of the first prism portion 132, the second prism portion 232 and the third prism portion 332 can be adjusted as needed.

[0032] The third haze layer 34 is disposed on the bottom surface of the third base portion 331 and is adjacent to the third light incident surface 31. The haze of the third haze layer 34 is greater than the haze of the second haze layer 24. The haze of the third haze layer 34 may be 10-50%, and in the first embodiment, the haze of the third haze layer 34 is 20%. The bottom surface of the third haze layer 34 constitutes the third light incident surface 31, and the top surface of the third prism portion 332 constitutes the third light emitting surface 32.

[0033] In addition, it should be noted that the haze of the third atomized layer 34 and the second atomized layer 24 can be adjusted according to needs and are different from the first embodiment, but the haze of the third atomized layer 34 is greater than the haze of the second atomized layer 24. For example, in some variant embodiments, the haze of the third atomized layer 34 is 0.5% to 30%, for example, the haze of the third atomized layer 34 can be changed to 15%, or the haze of the third atomized layer 34 can be changed to 10%, and the haze of the second atomized layer 24 can be changed to 5%.

[0034] The first mist layer 14 , the second mist layer 24 , and the third mist layer 34 are, for example, photocurable materials and are formed by a UV coating process, but the present invention is not limited thereto.

[0035] See also Figure 5 and Figure 6A second embodiment of the special optical structure composite film 100 of the present invention is different from the first embodiment in that, in the second embodiment, the first prism sheet 1 omits the first haze layer 14, and the first light-emitting surface 12 is formed by the top surface of the first base 131 of the first prism layer 13 adjacent to the first light-emitting surface 12. The special optical structure composite film 100 further includes an upper diffuser 4 disposed at the third light-emitting surface 32 of the third prism sheet 3, and the haze of the upper diffuser 4 is, for example, 10-60%, preferably, the haze of the upper diffuser 4 is 10% to less than or equal to 50%, and the haze of the upper diffuser 4 in the second embodiment is 50%.

[0036] The following describes the differences between the backlight module 300 formed by the first embodiment and the second embodiment of the present invention and the conventional backlight module 400 in the prior art.

[0037] See also Figure 1 and Figure 2 Specifically, in the conventional backlight module 400 in the prior art, the prism tip angles of the lower prism sheet 402b and the prism tip angles of the upper prism sheet 402c are both 90 degrees. The haze of the lower diffusion sheet 402a is 95% (or above), and the haze of the upper haze layer 402d is 30%.

[0038] The average brightness at each viewing angle of the backlight module 300 formed by the first embodiment is 160% (1.6 times) of the average brightness at each viewing angle of the conventional backlight module 400 in the prior art. The average brightness at each viewing angle of the backlight module 300 formed by the second embodiment is 170% (1.7 times) of the average brightness at each viewing angle of the conventional backlight module 400 in the prior art.

[0039] See also Figure 7 , which is a light type comparison diagram of the backlight module 300 composed of the first embodiment and the second embodiment and the traditional backlight module 400 in the prior art, wherein the horizontal axis is the viewing angle and the vertical axis is the brightness percentage compared to its own peak brightness. From this figure, it can be seen that the main light emission range of the backlight module 300 composed of the first embodiment and the second embodiment is more concentrated in the angle range of the front view area, so the visible viewing angle of the light emission is smaller, thereby meeting the needs of users in some situations and improving the optical visual texture of the overall backlight module 300.

[0040] In summary, the present invention can effectively improve the overall average brightness of the backlight module 300 composed of the light source assembly 200 and the special optical structure composite film 100 through the design of the second haze layer 24 of the second prism sheet 2 and the third haze layer 34 of the third prism sheet 3. In addition, the light output visual angle of the backlight module 300 is reduced to meet the needs of users in some situations and improve the optical visual texture of the overall backlight module 300. Furthermore, due to the design of the dispersed haze layer, the second prism sheet 2 and the third prism sheet 3 can be less scratched during the assembly process and a blemish-proof effect can be produced to improve the assembly yield of the special optical structure composite film 100.

[0041] The above are merely embodiments of the present invention and should not be used to limit the scope of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention still fall within the scope of the present invention.

Claims

1. A special optical structure composite film, suitable for use with a light source assembly, wherein the light source assembly has a light source light emitting surface, characterized in that: The special optical structure composite film comprises: A first prism sheet having a first light incident surface facing the light emitting surface of the light source, and a first light emitting surface opposite to the first light incident surface; A second prism sheet having a second light incident surface facing the first light emitting surface, a second light emitting surface opposite to the second light incident surface, and a second prism layer and a second haze layer located between and overlapping the second light incident surface and the second light emitting surface; as well as The third prism sheet has a third light incident surface facing the second light emitting surface, a third light emitting surface opposite to the third light incident surface, and a third prism layer and a third haze layer located between and overlapping the third light incident surface and the third light emitting surface. Wherein, the haze of the third atomized layer is greater than the haze of the second atomized layer.

2. The special optical structure composite film according to claim 1, characterized in that: The haze of the third atomized layer is 0.5% to 30%, and the haze of the second atomized layer is 1% to 20%.

3. The special optical structure composite film according to claim 1, characterized in that: The haze of the third atomized layer is 10% to 50%, and the haze of the second atomized layer is 1% to 20%.

4. The special optical structure composite film according to claim 1, characterized in that: The third prism layer has a third base and a third prism portion disposed on one side of the third base and adjacent to the third light emitting surface. The third haze layer is disposed on the other side of the third base and adjacent to the third light incident surface.

5. The special optical structure composite film according to claim 1, characterized in that: The second prism layer has a second base and a second prism portion disposed on one surface of the second base and adjacent to the second light emitting surface. The second haze layer is disposed on the other surface of the second base and adjacent to the second light incident surface.

6. The special optical structure composite film according to claim 1, characterized in that: The prism tip angle of the first prism sheet is 50 to 120 degrees, the prism tip angle of the second prism sheet is 50 to 120 degrees, and the prism tip angle of the third prism sheet is 50 to 150 degrees.

7. The special optical structure composite film according to claim 6, characterized in that: The prism tip angle of the third prism sheet minus the prism tip angle of the second prism sheet is -1 to 80 degrees, and the prism tip angle of the third prism sheet minus the prism tip angle of the first prism sheet is -1 to 80 degrees.

8. The special optical structure composite film according to claim 1, characterized in that: The first prism sheet further comprises a first prism layer and a first haze layer which are located between the first light incident surface and the first light emitting surface and overlap with each other, and the haze of the first haze layer is less than or equal to 20%.

9. The special optical structure composite film according to claim 8, characterized in that: The first prism layer has a first base and a first prism portion disposed on one surface of the first base and adjacent to the first light incident surface. The first haze layer is disposed on the other surface of the first base and adjacent to the first light emitting surface.

10. The special optical structure composite film according to claim 1, characterized in that: The first prism sheet further comprises a first prism layer, wherein the first prism layer comprises a first base portion adjacent to the first light emitting surface, and a first prism portion disposed on one side of the first base portion and adjacent to the first light incident surface.

11. The special optical structure composite film according to claim 10, characterized in that: The special optical structure composite film further comprises an upper diffusion sheet arranged at the third light-emitting surface of the third prism sheet, and the haze of the upper diffusion sheet is less than or equal to 50%.

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