TWM553821U - Optical film and display equipment - Google Patents

Description

Optical film and display device

The present invention relates to an optical film and display device, and more particularly to an optical film capable of producing a high collimating light source and a display device applied thereto.

LCD monitors are used in a wide range of applications, including cell phones, PDAs, car monitors, notebook computers, computer screens, and LCD TVs. However, the TFT-LCD (Thin Film Transistor-Liquid Crystal) display is a non-emission display. In addition to the liquid crystal panel that controls the display of the screen, an external backlight module is required to provide a planar light source. As for the conventional edge-lit backlight module, the light guide plate is used to form a planar light source. In addition to the light source, the light guide plate and the reflective sheet, the main component usually includes two prism sheets which are perpendicular to each other and disposed on the two. a two-diffusion sheet (Diffuser) in which the two light-collecting prism sheets are interposed between the upper and lower surfaces of the light-collecting prism sheet. The light-collecting prism sheet is generally referred to as a BEF (Brightness Enhancement Film), and its function is to limit the light-emitting limit angle. The majority of the light is emitted at a frontal viewing angle of ±22 to 25 degrees, and the rest of the light is retroreflected and recycled to achieve a light collecting and brightening effect, and the diffusing film has a diffused and uniform function to reduce brightness (luminance). ) Non-uniformity and obscuring optical defects such as the Moiré pattern.

In addition, the traditional use of microlens concentrating to improve the transflective backlight light utilization technology, or the use of grating diffraction color spectroscopy technology to replace the traditional dye absorption color filter to improve the light utilization technology, or A 3D display is used to produce a binocular vision misalignment using a cylindrical lens diaphragm. However, a common requirement of such known technologies lies in a high-precision straight-surface backlight, however, a conventional liquid crystal display backlight The full width at half maximum of the module light field is about 30 to 50 degrees, while the structure of the high collimation backlight technology known to provide a high collimated backlight is too complicated and difficult to process, which is not conducive to mass production.

Therefore, the object of the present invention is to provide an optical film of a highly collimated light source and a display device to be applied.

The optical film of the present invention comprises an light-in layer, a light-emitting layer, and an intermediate layer between the light-in layer and the light-emitting layer. The intermediate layer has a plurality of channel portions and a plurality of partition portions, the channel portions and the partition portions are staggered with each other, each channel portion having a first end portion facing the light entrance layer and facing the light exit layer a second end portion, each of the partition portions having a third end portion facing the light incident layer, and a fourth end portion facing the light exit layer, the first end portion and the third end portion being The light incident layer is shielded by the contact, and the second end portion and the fourth end portion are shielded by the light exiting layer.

Another technical means of the present invention is that the width of each of the first ends is less than the width of each of the second ends.

Yet another technical means of the present invention is that the width of each of the third ends is greater than the width of each of the fourth ends.

A further technical means of the present invention is that the optical film further comprises a plurality of reflecting members respectively disposed at the third end of the partition.

Another technical means of the present invention is that the refractive index of the channel portion is greater than the refractive index of the partition portion.

Yet another technical means of the present invention is to have air in each partition.

Still another technical means of the present invention is that each of the partitions further has a side surface facing the adjacent passage portion, and both the side surface and the third end portion have a reflecting function.

Another technical means of the novel is in the channel There is air inside the department.

The display device of the present invention comprises an optical film, a light source, an optical plate, and a display panel, wherein the optical plate receives the light generated by the light source and converts it into a planar light source, the optical film The light entrance layer faces the optical plate, and the light exit layer faces the display panel.

The beneficial effect of the novel is that, with the above design, the FWHM (Full Width Half Maximum) degree of the light field can be greatly reduced.

2‧‧‧Optical diaphragm

21‧‧‧Into the light layer

22‧‧‧Lighting layer

23‧‧‧Intermediate

231‧‧‧Channel Department

232‧‧‧Departure

233‧‧‧ first end

234‧‧‧second end

235‧‧‧ third end

236‧‧‧ fourth end

237‧‧‧ side

24‧‧‧reflector

3‧‧‧Light source

4‧‧‧Optical board

5‧‧‧ display panel

1 is a cross-sectional view showing a first preferred embodiment of the optical film of the present invention; FIG. 2 is a cross-sectional view showing a second preferred embodiment of the optical film of the present invention; and FIG. 3 is a cross-sectional view showing the novel A preferred embodiment of the display device.

The related features and technical details of the present invention will be apparent from the following detailed description of the preferred embodiments. It should be noted that, before the detailed description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1 , a first preferred embodiment of the optical film 2 of the present invention comprises an light-in layer 21 , a light-emitting layer 22 , and an intermediate layer 23 between the light-in layer 21 and the light-emitting layer 22 . . The intermediate layer 23 has a plurality of channel portions 231 and a plurality of partition portions 232. The channel portions 231 and the partition portions 232 are alternately arranged, and each channel portion 231 has a first end portion facing the light-in layer 21 233, and a second end portion 234 facing the light-emitting layer 22, each partition portion 232 has a third end portion 235 facing the light-incident layer 21, and a fourth end portion 236 facing the light-emitting layer 22, The first end portion 233 and the third end portion 235 are shielded by the light-incident layer 21, and the second end portion 234 and the fourth end portion 236 are shielded by the light-emitting layer 22.

Wherein, the width of each of the first end portions 233 is smaller than the width of each of the second end portions 234, and the width of each of the third end portions 235 is greater than the width of each of the fourth end portions 236. Therefore, the channel portion 231 may be gradually widened from the light entrance layer 21 toward the light exit layer 22, and the partition portion 232 may gradually appear from the light entrance layer 21 toward the light exit layer 22. Narrowed form.

In addition, the optical film 2 further includes a plurality of reflecting members 24 respectively disposed at the third end portion 235 of the partition portion 232. Therefore, after the light passes through the light entering layer 21, a part of the light is reflected by the reflecting member 24 and cannot pass through the partitioning portion 232, and another part of the light passes through the relatively narrow first portion. The end portion 233 is transferred through the channel portion 231, passes through the wider first end portion 233, and finally passes through the light exit layer 22. Since the first end portion 233 is relatively narrow, only light having a relatively straight angle can be passed, and light having a relatively divergent angle is easily reflected by the reflecting member 24 on the third end portion 235. Thereby, the FWHM (Full Width Half Maximum) degree of the light field can be greatly reduced.

Furthermore, in this embodiment, the refractive index of the channel portion 231 is greater than the refractive index of the partition portion 232, so that the channel portion 231 becomes an optically dense medium, and the partition portion 232 becomes a light-dissipating medium. When light is transmitted in the channel portion 231, at the boundary between the optically dense medium and the light-diffusing medium, the effect of total reflection is easily generated, and light is prevented from being refracted into the partition portion 232, causing energy dissipation. The condition may be that the partition portion 232 has air, the passage portion 231 is a plastic material such as PET or PMMA, and the passage portion 231 made of PET or PMMA is a light-tight medium, compared with the The air in the partition 232 is a light-dissipating medium.

Referring to FIG. 2, a second preferred embodiment of the optical film 2 of the present invention is different from the first preferred embodiment in that, in the embodiment, the partition portion 232 further has a channel portion facing the channel portion. The side surface 237 of the 231 has a reflecting function, and the third end portion 235 has a reflecting function, and the channel portion 231 has air therein.

After the light passes through the light-into-layer 21, a part of the light is reflected by the third end 235 and cannot pass through the partition 232, and another part of the light passes through the relatively narrow first The end portion 233 is transferred through the channel portion 231, passes through the wider first end portion 233, and finally passes through the light exit layer 22. Since the first end portion 233 is relatively narrow, only light having a relatively straight angle can pass, and light having a relatively divergent angle is easily reflected by the third end portion 235 having a reflecting function. The FWHM (Full Width Half Maximum) degree of the light field is greatly reduced.

Furthermore, the partitioning portion 232 of the embodiment may be made of a high reflectivity material or a surface coated with a high reflectivity coating. Therefore, the side surface 237 and the third end end. The portions 235 all have a reflecting function, and when the light is transmitted in the channel portion 231, the side surface 237 is reflected by the side surface 237 due to its reflection function, thereby preventing light from being refracted into the partition portion 232, resulting in The escape of energy. At this time, the present embodiment does not utilize the principle of total reflection at the boundary between the optically dense medium and the optically-sparing medium, but simply utilizes the high reflectivity substance or the high reflectance coating of the partition portion 232 itself. Therefore, in this embodiment, the air portion in the channel portion 231 can be adopted. Different from the first embodiment, the partition portion 232 has air, and the channel portion 231 is a plastic such as PET or PMMA. The shape of the material.

Referring to FIG. 3, a preferred embodiment of the display device of the present invention includes the optical film 2, a light source 3, an optical plate 4, and a display panel 5. Wherein the optical plate 4 receives the light source 3 The light-emitting layer 21 of the optical film 2 faces the optical plate 4, and the light-emitting layer 22 of the optical film 2 faces the display panel 5. In this embodiment, the optical plate 4 is in the form of a light guide plate for application to the side-entry backlight module. In addition, if applied to the direct-lit backlight module, the optical plate 4 is a diffuser plate. .

In summary, the present invention provides an optical film 2 of a highly collimated light source and a display device to be applied. The first end portion 233 is narrower, so that only a relatively straight angle of light can pass. The light having a relatively divergent angle is easily reflected by the reflection member 24 on the third end portion 235 or the third end portion 235 having a reflection function, and cannot enter the partition portion 232. The FWHM (Full Width Half Maximum) degree of the light field is greatly reduced, so the purpose of the present invention can be achieved.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent change and modification made by the novel patent application scope and the novel description content, All remain within the scope of this new patent.

2‧‧‧Optical diaphragm

21‧‧‧Into the light layer

22‧‧‧Lighting layer

23‧‧‧Intermediate

231‧‧‧Channel Department

232‧‧‧Departure

233‧‧‧ first end

234‧‧‧second end

235‧‧‧ third end

236‧‧‧ fourth end

24‧‧‧reflector

Claims (9)

An optical film comprising: an light-in layer; a light-emitting layer; and an intermediate layer between the light-in layer and the light-emitting layer, the intermediate layer having a plurality of channel portions and a plurality of partitions, the channel And the partition portion is staggered with each other, each channel portion has a first end portion facing the light entrance layer, and a second end portion facing the light exit layer, each partition portion having a surface facing the light entrance layer a third end portion, and a fourth end portion facing the light exiting layer, the first end portion and the third end portion are covered by the light incident layer, the second end portion and the first end portion The four ends are shielded by the contact of the light exiting layer. The optical film of claim 1, wherein the width of each of the first ends is less than the width of each of the second ends. The optical film of claim 1, wherein the width of each of the third ends is greater than the width of each of the fourth ends. The optical film of claim 1, wherein the optical film further comprises a plurality of reflecting members respectively disposed at the third end of the partition. The optical film of claim 4, wherein the channel portion has a refractive index greater than a refractive index of the partition. The optical film of claim 5, wherein each partition has air therein. The optical film of claim 1, wherein each partition further has a side facing the adjacent passage portion, the side and the side The third end has a reflection function. The optical film of claim 7, wherein the channel portion has air therein. A display device, comprising: an optical film, a light source, an optical plate, and a display panel according to any one of claims 1 to 8, wherein the optical plate receives light generated by the light source And converting into a planar light source, the light-incoming layer of the optical film faces the optical plate, and the light-emitting layer faces the display panel.