CN219715791U - Incremental light-homogenizing integrated highlight diaphragm and backlight module - Google Patents

Abstract

The utility model provides an increment light-homogenizing integrated highlight film and a backlight module, which comprise a substrate (10) and an optical structure (20), wherein the optical structure (20) is a periodic triangular pyramid grating structure; each triangular pyramid grating structure performs random up-down and left-right structure dithering along the grating direction, namely random period dithering is performed by taking the central period of the grating as the center, and random height dithering is performed by taking the central height of the grating as the center. The highlight film ensures the optical effect and simultaneously eliminates bad optical phenomena generated in the application process when the highlight film is attached to other films or devices; meanwhile, the high-brightness film adjusts the optical fiber part with a large emergent angle caused by scattering emitted by the backlight to emergent light with a small angle, so that the display light intensity within a certain small angle range of the front view angle is enhanced. The high-brightness film has low generation cost and wide application range.

Description

Incremental light-homogenizing integrated highlight diaphragm and backlight module

Technical Field

The utility model relates to the technical field of optical elements, in particular to an increment and light homogenizing integrated highlight diaphragm and a backlight module.

Background

In recent years, with the development of display technology, requirements of some display devices for viewing angle and brightness are increasing, for example: VR display devices, privacy display devices, in-screen fingerprint display devices, etc., all require higher brightness at small angle viewing angles on the screen of the display device. The collimation backlight can collimate large-angle light to the front view angle, and meanwhile, the brightness of the front view angle is improved, and the brightness of a large viewing angle is reduced. At present, a conventional collimation backlight scheme adopts a wedge-shaped light guide plate, the backlight module consists of a light source, the wedge-shaped light guide plate, a reverse prism sheet and a reflecting sheet, wherein the wedge-shaped light guide plate comprises a light inlet surface, a first light outlet surface, a second light outlet surface and a third light outlet surface, a part of light of the light source on one side of the light inlet surface is vertically emitted from the third light outlet surface, so that the wedge-shaped light guide plate generates light leakage, serious light loss is caused, the light loss is related to the height ratio between the third light outlet surface and the light inlet surface, the light utilization rate of the backlight module is seriously influenced, and the light utilization rate of the backlight module is low.

In addition, other existing technical modes, such as the existing DBEF (reflective polarization brightness enhancement film) series, are adopted, so that the cost is high and the use difficulty is high.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model aims to provide an incremental light-homogenizing integrated highlight film which enhances the brightness in a low-cost mode, eliminates bad optical phenomena such as adsorption, interference patterns, rainbow patterns, newton rings and the like generated when the film is attached to other films or devices in the application process, and solves the problem of low brightness of the traditional backlight structure.

Another object of the present utility model is to provide a backlight module using the above-mentioned highlight film.

The aim of the utility model is achieved by the following technical scheme:

an increment even light integration's highlight diaphragm, its characterized in that: the optical structure is a periodic triangular pyramid grating structure; each triangular pyramid grating structure performs random up-down and left-right structure dithering along the grating direction, namely random period dithering is performed by taking the central period of the grating as the center, and random height dithering is performed by taking the central height of the grating as the center.

In a preferred embodiment of the present utility model, the substrate is any one of PET, PC, PMMA, COP, PE, PI, CPI, TAC, PEN; the base material comprises two thicknesses of a plate and a diaphragm, wherein the thickness range of the plate is 250 mu m-2 mm, and the thickness range of the diaphragm is 25 mu m-250 mu m.

In a preferred embodiment of the present utility model, the optical structure is made of any one of UV-cured acrylate resin material, UV-cured and thermally-cured epoxy resin material, UV-cured silica gel material; the transmittance of the optical structural material is 90-95%, and the refractive index is 1.45-1.62.

In a preferred embodiment of the present utility model, the triangular pyramid apex angle of the optical structure is 80 ° to 90 °, the center period is 21 to 25 μm, and the center height is 10 to 15 μm.

In a preferred embodiment of the utility model, the optical structure has the same period and height jitter amplitude, and the range of period or height jitter is two or three of 1 μm, 1.5 μm or 2 μm.

In the preferred scheme of the utility model, the total area of the dithering structure in the optical structure accounts for 10% -40% of the total area of the highlight film structure.

In a preferred embodiment of the present utility model, a light homogenizing structure is disposed on a side surface of the substrate away from the optical structure, where the surface roughness of the light homogenizing structure isRa0.2～Ra1.5, and the even light structure has 5 to 25 percent of different haze. The light homogenizing structure is an antiglare optical structure (AG), and any one of particle light homogenizing structures and light homogenizing structures with directivity are coatedThe uniform light structure is obtained by any one of Beads coating, matte coating and micro-nano structure molding.

The utility model provides a high bright diaphragm of increment even light integration's backlight unit, application, its characterized in that: the light guide plate, the highlight film, the lower prism sheet, the upper prism sheet and the diffusion sheet are sequentially arranged from bottom to top, the highlight film is directly arranged between the light guide plate and the lower prism sheet, and the optical structure of the highlight film faces towards the light guide plate.

In the preferred scheme of the utility model, the backlight module adopts an LED light source, and the side surface of one side of the light guide plate, which is far away from the highlight film, is provided with the reflecting sheet.

A display device, characterized in that: the backlight module in the display device is applied to the highlight film.

The utility model has the following technical effects:

according to the utility model, through random up-down and left-right structural dithering along the grating direction in the optical structure, the optical effect is ensured, and meanwhile, the bad optical phenomena such as adsorption, interference patterns, rainbow patterns, newton rings and the like generated when the highlight film is attached to other films or devices in the application process are eliminated; when the highlight film is applied to a backlight module of a display device, the optical fiber part with a large emergent angle caused by scattering emitted by backlight can be adjusted to emergent light with a small angle through a specific optical structure, so that the display light intensity in a certain small angle range of a front view angle is enhanced.

Compared with the prior DBEF series products, the highlight film has low production cost and small use difficulty, and is convenient for use in different fields.

Drawings

Fig. 1 is a schematic structural diagram of a backlight module in the background art.

Fig. 2 is a schematic structural diagram of a highlight film according to an embodiment of the present utility model.

FIG. 3 is a cross-sectional view of a highlighting membrane according to an embodiment of the present utility model.

Fig. 4 is a schematic structural diagram of an optical structure of a highlight film according to an embodiment of the present utility model.

FIG. 5 is a cross-sectional view of an optical structure of a highlight film according to an embodiment of the present utility model.

Fig. 6 is a schematic structural diagram of a backlight module according to an embodiment of the utility model.

Fig. 7 is a cross-sectional view of a backlight module according to an embodiment of the utility model.

Fig. 8 is a physical diagram of a highlight film according to an embodiment of the present utility model.

1, a light source; 2. a wedge-shaped light guide plate; 3. a reverse prism sheet; 4. a reflection sheet; a. a light incident surface; b. a first light-emitting surface; c. a second light-emitting surface; d. a third light-emitting surface; 10. a substrate; 20. an optical structure; 21. a first region; 22. a second region; 23. a third region; 30. a light homogenizing structure; 100. a light guide plate; 200. highlighting the membrane; 300. a lower prism sheet; 400. an upper prism sheet; 500. a diffusion sheet; 600. a reflection sheet; 700. an LED light source.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Example 1

As shown in fig. 2 to 5: an increment even light integration's highlight diaphragm, its characterized in that: comprising a substrate 10 and an optical structure 20, wherein the substrate 10 is made of any one of PET, PC, PMMA, COP, PE, PI, CPI, TAC, PEN materials; the substrate 10 includes both a plate material having a thickness in the range of 250 μm to 2mm (1 mm is preferable in this embodiment) and a membrane having a thickness in the range of 25 μm to 250 μm (125 μm is preferable in this embodiment).

The optical structure 20 is a periodic triangular pyramid grating structure; as shown in fig. 3: the triangular pyramid apex angle r of the optical structure 20 is 80 ° to 90 ° (85 ° in this embodiment is preferred), the center period m is 21 to 25 μm (23 μm in this embodiment is preferred), and the center height n is 10 to 15 μm (12.5 μm in this embodiment is preferred). The optical structure 20 is made of any one of a UV-cured acrylate resin material, a UV-cured and thermally-cured epoxy resin material, and a UV-cured silicone material; the transmittance of the material of the optical structure 20 is 90% to 95% (93% in this embodiment, preferably), and the refractive index is 1.45 to 1.62 (1.53 in this embodiment). Each triangular pyramid grating structure performs random up-down and left-right structure dithering along the grating direction, namely random period dithering with the central period m of the grating as the center and the range of 1 mu m, 1.5 mu m or 2 mu m is performed, and random height dithering with the central height n of the grating as the center and the range of 1 mu m, 1.5 mu m or 2 mu m is performed; meanwhile, the random period jitter and the random height jitter have the same amplitude and the jitter range comprises two or three of 1 μm, 1.5 μm or 2 μm, namely the random period jitter range is 1 μm and 1.5 μm, the random height jitter range is 1 μm and 1.5 μm, the random period jitter range is 1 μm, 1.5 μm and 2 μm, and the random height jitter range is 1 μm, 1.5 μm and 2 μm. The total area of the dither structure in the optical structure accounts for 10% -40% (preferably 25% in this embodiment) of the total area of the highlight film structure.

The mold of the optical structure 20 is manufactured by carving hard rolls, specifically: engraving a copper roller according to an angle design to prepare a required mould roller, wherein after the hard roller is engraved, the hard roller can be used as a mould to produce a membrane by means of UV nanoimprint or thermoforming nanoimprint; or the soft mold can be manufactured by a hard roller through UV nanoimprint or thermoforming nanoimprint.

The side surface of the substrate 10 far away from the optical structure 20 is provided with a light homogenizing structure 30, that is, the highlight film has a front-back double-sided structure, and a triangular pyramid grating structure on the front surface and a light homogenizing structure 30 on the back surface can be defined. The surface roughness of the dodging structure 30 isRa0.2～Ra1.5 (preferred in this embodiment)Ra1.0 With a haze of 5% to 25% of the light homogenizing structure 30. The light uniformizing structure 30 is any one of an antiglare optical structure (AG), a coated particle light uniformizing structure, a light uniformizing structure with directivity (an antiglare optical structure, a coated particle light uniformizing structure, a light uniformizing structure with directivity all adopt a structure common in the art, as will be understood by those skilled in the art), and the light uniformizing structure 30 adopts any one of a Beads coating, a material coating, and a micro-nano structure moldingOne way is obtained.

The processing method of the optical structure 10 and the dodging structure 30 is any one of roll-to-roll UV nanoimprinting, roll-to-flat UV nanoimprinting, roll-to-roll thermoforming imprinting, roll-to-roll optical coating and the like; the adopted UV light source comprises a single-band LED light source, a compound-band mercury lamp light source and the like.

Example 2

As a further optimization of the scheme of the present utility model, the highlighting film described in example 1 can be applied to a backlight of various displays including TFT-LCD, OLED, QLED, etc., on the basis of the scheme of example 1.

Example 3

As a further optimization of the scheme of the present utility model, as shown in fig. 6 to 7, a backlight module with integrated incremental dodging, applying the highlighting film as described in embodiment 1, is characterized in that: the light guide plate 100, the highlight film 200, the lower prism sheet 300, the upper prism sheet 400 and the diffusion sheet 500 are sequentially included from bottom to top, the highlight film 200 is directly placed between the light guide plate 100 and the lower prism sheet 300, and the optical structure 20 of the highlight film 200 faces the light guide plate 100; no adhesive is needed between the highlight film 200 and the lower prism sheet 300 for fixing and bonding, as shown in fig. 6: the ribs of the lower prism sheet 300 and the upper prism sheet 400 face one side of the diffusion sheet 500 and the ribs between the lower prism sheet 300 and the upper prism sheet 400 are perpendicular to each other.

The backlight module adopts the LED light source 700, and the side surface of the light guide plate 100 far away from the highlight film 200 is provided with the reflecting sheet 600.

Claims (6)

1. An increment even light integration's highlight diaphragm, its characterized in that: comprises a substrate (10) and an optical structure (20), wherein the optical structure (20) is a periodic triangular pyramid grating structure; each triangular pyramid grating structure performs random up-down and left-right structure dithering along the grating direction, namely performs random period dithering by taking the central period of the grating as the center, and performs random height dithering by taking the central height of the grating as the center;

the optical structure (20) has the same period and height jitter amplitude, and the range of period or height jitter is two or three of 1 μm, 1.5 μm or 2 μm;

the total area of the dithering structures in the optical structure (20) accounts for 10% -40% of the total area of the highlight film structure.

2. The incremental light homogenizing integrated highlighting membrane of claim 1, wherein: the substrate (10) is made of any one of PET, PC, PMMA, COP, PE, PI, CPI, TAC, PEN materials; the substrate (10) comprises two thicknesses of a plate and a membrane, wherein the thickness of the plate ranges from 250 mu m to 2mm, and the thickness of the membrane ranges from 25 mu m to 250 mu m.

3. An incremental light homogenizing integrated highlighting membrane according to claim 1 or 2, wherein: the triangular pyramid vertex angle of the optical structure (20) is 80-90 degrees, the center period is 21-25 mu m, and the center height is 10-15 mu m.

4. The incremental light homogenizing integrated highlighting membrane of claim 1, wherein: a light homogenizing structure (30) is arranged on one side surface of the substrate (10) far away from the optical structure (20), and the surface roughness of the light homogenizing structure (30) is as followsRa 0.2～Ra1.5, and the light homogenizing structure (30) has haze of 5-25%.

5. A backlight module using the highlighting film as recited in claim 3, wherein: the light guide plate comprises a light guide plate (100), a highlight film (200), a lower prism sheet (300), an upper prism sheet (400) and a diffusion sheet (500) from bottom to top in sequence, wherein the highlight film (200) is directly placed between the light guide plate (100) and the lower prism sheet (300), and an optical structure (20) of the highlight film (200) faces towards the light guide plate (100).

6. A backlight module using the highlighting film as recited in claim 4, wherein: the light guide plate comprises a light guide plate (100), a highlight film (200), a lower prism sheet (300), an upper prism sheet (400) and a diffusion sheet (500) from bottom to top in sequence, wherein the highlight film (200) is directly placed between the light guide plate (100) and the lower prism sheet (300), and an optical structure (20) of the highlight film (200) faces towards the light guide plate (100).