Optical film and display device using the same

Abstract

Optical films and display devices thereof are provided. An optical film includes a substrate, a first optical layer, a plurality of second optical layers, and a third optical layer. The first optical layer is formed on the substrate, wherein the first optical layer has an optical structure including a plurality of grooves. The second optical layer is formed in the grooves of the optical structure of the first optical layer. The third optical layer covers the first optical layer and the second optical layer. A display device includes a display and the optical film, wherein the optical film is disposed on the display. The display device with the optical film is provided to solve the problem of deteriorated image quality at large viewing angles.

Description

Technical Field

[0001] One embodiment of the present invention relates to an optical thin film and a display device using the optical thin film, and particularly to a wide-viewing-angle optical thin film and a display device using the optical thin film. Background Technology

[0002] In recent years, display devices have been widely used in various electronic products (such as personal computers, laptops, digital cameras, smartphones, tablets, and televisions). Display devices (such as liquid crystal displays (LCDs)) have the problem of degraded image quality at wide viewing angles. For example, when a user views an image displayed on a display device at a wide viewing angle, the image quality may be degraded due to the wide viewing angle. Summary of the Invention

[0003] The embodiments of this disclosure provide an optical thin film to solve the aforementioned problem of degraded image quality at large viewing angles. The optical thin film includes a substrate, a first optical layer, a second optical layer, and a third optical layer. The first optical layer is formed on the substrate, wherein the first optical layer has an optical structure having a plurality of grooves. The second optical layer is formed on the first optical layer. The third optical layer covers the first and second optical layers, wherein the third optical layer has an optical structure having a plurality of grooves. The second optical layer is conformal to the first optical layer, or the second optical layer is composed of a plurality of optical portions located in the grooves.

[0004] In some embodiments, the first optical layer has a first refractive index, the second optical layer has a second refractive index, and the third optical layer has a third refractive index, wherein the second refractive index is greater than the first refractive index and the third refractive index.

[0005] In some embodiments, the first optical layer has a first refractive index, the second optical layer has a second refractive index, and the third optical layer has a third refractive index, wherein the second refractive index is less than the first refractive index and the third refractive index.

[0006] In some embodiments, the optical structure of the first optical layer has a height H t And the second optical layer has a thickness D s , and 0.1H t <D s <0.8H t .

[0007] In some embodiments, the optical structure is a periodic structure.

[0008] In some embodiments, the periodic structure is a sinusoidal structure.

[0009] In some embodiments, the first optical layer, the second optical layer, and the third optical layer are resin layers.

[0010] Another disclosed embodiment provides a display device with an optical thin film to solve the aforementioned problem of degraded image quality at wide viewing angles. The display device includes a display and an optical thin film. The optical thin film is disposed on the display to receive light emitted from the display, wherein the optical thin film includes a substrate, a first optical layer, a second optical layer, and a third optical layer. The first optical layer is formed on the substrate, wherein the first optical layer has an optical structure having a plurality of grooves. A second optical layer is formed on the first optical layer. The third optical layer covers the first and second optical layers, wherein the third optical layer has an optical structure having a plurality of grooves. The second optical layer is conformal to the first optical layer, or the second optical layer is composed of a plurality of optical portions located in the grooves.

[0011] In some embodiments, the first optical layer has a first refractive index, the second optical layer has a second refractive index, and the third optical layer has a third refractive index, wherein the second refractive index is greater than the first refractive index and the third refractive index.

[0012] In some embodiments, the first optical layer has a first refractive index, the second optical layer has a second refractive index, and the third optical layer has a third refractive index, wherein the second refractive index is less than the first refractive index and the third refractive index.

[0013] In some embodiments, the optical structure of the first optical layer has a height H t And the second optical layer has a thickness D s , and 0.1H t <D s <0.8H t .

[0014] In some embodiments, the optical structure is a periodic structure.

[0015] In some embodiments, the periodic structure is a sinusoidal structure.

[0016] In some embodiments, the first optical layer, the second optical layer, and the third optical layer are resin layers.

[0017] In some embodiments, the optical film receives light passing through the third optical layer from the display, and the optical film outputs light from the display through the substrate.

[0018] In some embodiments, the display is a liquid crystal display.

[0019] Another disclosed embodiment provides a display device. This display device includes a display panel, a backlight module, and an optical film. The backlight module is configured to emit light to the display panel. The optical film is disposed between the display panel and the backlight module to distribute the light emitted from the backlight module. The optical film has a substrate, a first optical layer, a second optical layer, and a third optical layer. The first optical layer is formed on the substrate, wherein the first optical layer has an optical structure having a plurality of grooves. The second optical layer is formed on the first optical layer. The third optical layer covers the first and second optical layers, wherein the third optical layer has an optical structure having a plurality of grooves. The second optical layer is conformal to the first optical layer, or the second optical layer is composed of a plurality of optical portions located in the grooves.

[0020] In some embodiments, the first optical layer has a first refractive index, the second optical layer has a second refractive index, and the third optical layer has a third refractive index, wherein the second refractive index is greater than the first refractive index and the third refractive index.

[0021] In some embodiments, the first optical layer has a first refractive index, the second optical layer has a second refractive index, and the third optical layer has a third refractive index, wherein the second refractive index is less than the first refractive index and the third refractive index.

[0022] In some embodiments, the optical structure of the first optical layer has a height H t And the second optical layer has a thickness D s , and 0.1H t <D s <0.8H t . Attached Figure Description

[0023] The present invention can be more fully understood by reading the following detailed embodiments and referring to the accompanying drawings.

[0024] Figure 1 The present disclosure provides a schematic diagram of a display device based on an embodiment.

[0025] Figure 2 A schematic diagram showing the light distribution from the display to the optical thin film according to embodiments of the present disclosure.

[0026] Figure 3A A schematic diagram showing parameters of contrast modulation (CM) according to embodiments of the present disclosure.

[0027] Figure 3B A schematic diagram showing the modulation contrast curve of the display device and the compensation intensity curve of the side viewing angle of the display device according to an embodiment of the present disclosure.

[0028] Figure 4A schematic diagram of a flowchart illustrating a method for manufacturing an optical thin film according to embodiments of the present disclosure.

[0029] Figures 5A to 5E A schematic diagram showing an intermediate stage in the manufacturing process of optical thin films.

[0030] Figure 6 The present disclosure provides a schematic diagram of a display device based on an embodiment.

[0031] Figure 7 A schematic diagram showing the structure of an optical thin film according to embodiments of the present disclosure.

[0032] Figure 8 A schematic diagram showing the light distribution from the display to the optical thin film according to embodiments of the present disclosure.

[0033] Figure 9 The present disclosure provides a schematic diagram of a display device based on an embodiment.

[0034] [List of Labels in the Attached Image]

[0035] 100: Display device, monitor

[0036] 110: Display panel

[0037] 120, 140: Adhesive layer

[0038] 130: Polarizing layer

[0039] 150, 750: Optical thin films

[0040] 151, 152, 153, 752: Optical layer

[0041] 151a: Trench

[0042] 154: Substrate

[0043] 310, 320: Curves

[0044] 331-339: Pixel Group

[0045] 400: Manufacturing Method

[0046] 410, 420, 430, 440: Steps

[0047] 600, 900: Display devices

[0048] 910: Backlight Module

[0049] CM: Modulated Contrast

[0050] DP: Display

[0051] Ds: Thickness

[0052] Ht: Height

[0053] LB, LB1, LB2, Ls, LSD: Light beams

[0054] PB: Blue Pixel

[0055] PG: Green Pixel

[0056] PR: Red Pixel

[0057] Sd: Average value of the black line

[0058] Sg: Glare Correction Value

[0059] Sh: Average value of the white line

[0060] Λ: Grating period Detailed Implementation

[0061] Specific embodiments of this disclosure are described in more detail below with reference to the accompanying drawings. However, these embodiments are not intended to limit the invention, and the description of operation is not intended to limit the order of implementation. Furthermore, any device with equivalent functionality should fall within the scope of the invention, wherein the structure formed by the rearrangement of elements produces this device. Additionally, the drawings are illustrative only and are not drawn to actual dimensions.

[0062] The terms “first,” “second,” “third,” etc., used in the instruction manual should be understood as identifying units or data described by the same terms, but not as implying a specific order or sequence.

[0063] Figure 1The present disclosure provides a schematic diagram of a display device 100 according to an embodiment. In the display device 100, a display DP having a display panel 110, a first adhesive layer 120, and a polarizing layer 130 are configured to provide an image, and a second adhesive layer 140 and an optical thin film 150 are disposed on the display DP. In this embodiment, the display DP is a liquid crystal display (LCD). For example, the display DP is a twisted nematic (TN) liquid crystal display panel or a super twisted nematic (STN) liquid crystal display panel. However, the present disclosure is not limited thereto. In some embodiments, the display DP may be configured to display images as a plasma display (PDP), an organic light-emitting diode display (OLED), a small-pitch display (MiniLED), a micro-light-emitting diode display (MicroLED), or an electronic paper display.

[0064] A polarizing layer 130 is disposed on a liquid crystal display panel 110. In this embodiment, a first adhesive layer 120 is disposed between the polarizing layer 130 and the liquid crystal display panel 110 to fix the polarizing layer 130. However, this disclosure is not limited thereto. In some embodiments, the polarizing layer 130 can be fixed to the liquid crystal display panel 110 by using a specific mechanism (e.g., a display frame). Therefore, the first adhesive layer 120 can be omitted.

[0065] An optical thin film 150 is disposed on a polarizing layer 130. In other words, the polarizing layer 130 is disposed between the optical thin film 150 and the liquid crystal display panel 110. Similarly, a second adhesive layer 140 is disposed between the polarizing layer 130 and the optical thin film 150 to fix the optical thin film 150. The optical thin film 150 includes a first optical layer 151, a second optical layer 152, a third optical layer 153, and a substrate 154.

[0066] In some embodiments, the first optical layer 151, the second optical layer 152, and the third optical layer 153 may each be a viscoelastic or elastic adhesive (such as a pressure-sensitive adhesive (PSA), a rubber-based adhesive, and a polysiloxane adhesive). Examples of viscoelastic or elastic adhesives include polyurethane-based adhesives, polysiloxane adhesives, styrene-block-copolymer-based adhesives, (meth)acrylic-block-copolymer-based adhesives, polyvinyl ether-based adhesives, polyolefin-based adhesives, and polymethacrylate-based adhesives.

[0067] In some embodiments, the first optical layer 151, the second optical layer 152, and the third optical layer 153 may be resin layers. Examples of materials for the resin layers may include thermosetting resins or ultraviolet (UV) curable resins formed from (meth)acrylic acid, urethane, (meth)acrylic urethane, epoxy resin, or polyoxymethylene resin.

[0068] A first optical layer 151 is formed on a substrate 154. The first optical layer 151 has an optical structure. In this embodiment, the optical structure is a periodic structure (e.g., a sinusoidal wave structure with troughs). A second optical layer 152 has a plurality of optical portions disposed in the grooves of the first optical layer 151. A third optical layer 153 is formed on the first optical layer 151 and the second optical layer 152. Specifically, the third optical layer 153 covers the first optical layer 151 and the second optical layer 152 and has an optical structure, wherein this optical structure has grooves (corresponding to protrusions in the first optical layer). Figure 1 As shown, the third optical layer 153 is disposed adjacent to the display DP, and the first optical layer 151 is disposed away from the display DP.

[0069] Figure 2 This embodiment of the present disclosure provides a schematic diagram of the light distribution from the display panel (DP) to the optical thin film 150. In this embodiment, the optical thin film 150 addresses the problem of degraded image quality at wide viewing angles. The optical thin film 150 serves as a wide-viewing-angle film to solve the problem of degraded image quality at wide viewing angles.

[0070] like Figure 2 As shown, the optical film 150 receives light rays from the display DP passing through the third optical layer 153, and the optical film 150 outputs light rays from the display DP through the substrate 154. In other words, light rays from the display DP pass through the third optical layer 153 into the optical film 150, and pass through the substrate 154 to exit the optical film 150. For example, light rays Ls at the normal viewing angle of the display DP pass through the third optical layer 153 into the optical film 150, and then the normal viewing angle light rays Ls split into light rays L... SD , where this ray L SD It passes through the substrate 154, exits the optical film 150, and passes through the light L. SD This allows for image quality compensation over wide viewing angles. For example, the side viewing angle L of a display's DP... B The light rays L pass through the third optical layer 153 and enter the optical thin film 150, then pass through the side-view light beam. B Separated into light rays L B1 With L B2 Among them, light L B1 With L B2 It passes through the substrate 154 and exits the optical film 150. The optical film 150 is capable of uniformly separating the light rays Ls at a positive angle into light rays L... SD And significantly reduce light intensity (L) B2 The intensity of the light ray L B2 This corresponds to the orthographic viewing angle of the display device 100. A detailed description of the optical thin film 150 follows.

[0071] Assuming the optical structure of the first optical layer 151 has a height H t Each optical portion of the second optical layer 152 has a thickness D. s In embodiments of this disclosure, the design height H t With thickness D S To satisfy the relationship: 0.1H t <D s <0.8H t Furthermore, the first optical layer 151 has a first refractive index n1, the second optical layer 152 has a second refractive index n2, and the third optical layer 153 has a third refractive index n3. In some embodiments of this disclosure, the second refractive index n2 is greater than the first refractive index n1 and the third refractive index n3. In some embodiments, the second refractive index n2 is less than the first refractive index n1 and the third refractive index n3.

[0072] Reference Figure 3A and Figure 3B According to embodiments of this disclosure, Figure 3A A schematic diagram showing the parameters of contrast modulation (CM), and Figure 3BThis is a schematic diagram showing the modulation contrast curve 310 of the display device 100 and the compensation intensity curve 320 of the side viewing angle of the display device 100. (See diagram below.) Figure 3A As shown, red pixels PR, green pixels PG, and blue pixels PB are arranged in a matrix, wherein this matrix includes pixel groups 331-339, each containing one column of red pixels PR, one column of green pixels PG, and one column of blue pixels PB. To calculate the modulation contrast, pixel groups 331, 333, 335, 337, and 339 are enabled, and pixel groups 332, 334, 336, and 338 are disabled. In embodiments of this disclosure, the modulation contrast can be represented by the equation described later:

[0073] in

[0074] like Figure 3B As shown, the modulation contrast and the compensation intensity for the side viewing angle of the display device 100 are related to the thickness D of the second optical layer 152. s .

[0075] For example, when the thickness D of the second optical layer 152 s In essence, it is equal to 0.25H. t At that time, the modulation contrast of the display device 100 is essentially equal to 0.6. When the thickness D of the second optical layer 152... s Increased to be substantially equal to H t At this time, the modulation contrast of the display device 100 is essentially equal to 0.3. In other words, when the thickness D of the second optical layer 152... s When the contrast is increased, the modulation contrast of the display device 100 decreases, and therefore the single words or letters displayed by the display device 100 may become blurry.

[0076] To give another example, when the thickness D of the second optical layer 152 s Essentially equivalent to 0.25H t At that time, the compensation intensity for the side viewing angle of the display device 100 is approximately 0.2. When the thickness D of the second optical layer 152... s Increased to be substantially equivalent to 0.75H t At that time, the compensation intensity for the side viewing angle of the display device 100 is essentially equal to the maximum value of approximately 0.65. In other words, at 0.25H... t up to 0.75H t In the section, when the thickness D of the second optical layer 152 s As the thickness D increases, the image quality of the display device 100 at wide viewing angles also improves. Next, when the thickness D of the second optical layer 152 increases... s Increased to be substantially equal to H t At that time, the compensation intensity of the side viewing angle of the display device 100 is reduced to 0.3.

[0077] Therefore, in embodiments of the present invention, the design height H is... t With thickness D s To satisfy the relationship: 0.1H t <D s <0.8H t This balances the compensation intensity for the side viewing angles of the CM and the display device 100. In other words, when the aforementioned relationship is achieved, the user can obtain better image quality with a wider viewing angle.

[0078] In this embodiment, the grating period Λ is designed to be 4 micrometers (μm), the first refractive index n1 of the first optical layer 151 is designed to be 1.49, the second refractive index n2 of the second optical layer 152 is designed to be 1.65, the third refractive index n3 of the third optical layer 153 is designed to be 1.5, and the thickness D is... s Designed for 0.5H t However, the embodiments disclosed herein are not limited thereto.

[0079] Figure 4 This is a schematic flowchart of a method 400 for manufacturing an optical thin film 150, according to an embodiment of the present disclosure. In the manufacturing method 400, as... Figure 5A As shown, initial step 410 involves forming substrate 154. Substrate 154 may be a resin layer. Examples of materials for the resin layer may include thermosetting or UV-curable resins formed from (meth)acrylic acid, ethyl carbamate, (meth)acrylic polyurethane, epoxy resin, or polysiloxane. Next, as... Figure 5B As shown, step 420 involves forming a first optical layer 151 on a substrate 154. In some embodiments, the material of the first optical layer 151 may be deposited on the substrate 154, followed by a manufacturing process such as photolithography, engraving, embossing, transfer printing, or printing on the material of the first optical layer 151 to form a periodic structure (e.g., a sine wave) of the first optical layer 151, wherein the first optical layer 151 has a plurality of trenches 151a.

[0080] Then, step 430 involves forming a second optical layer 152 in the trench 151a of the first optical layer 151. For example... Figure 5C As shown, when the material of the second optical layer is deposited on the first optical layer 151, the second optical layer 152 conforms to the first optical layer 151. In this embodiment, as... Figure 5D As shown, because the material of the second optical layer 152 has a low viscosity (e.g., the viscosity of the material of the second optical layer 152 is less than 30 cps), the second optical layer 152 separates into multiple optical parts after a certain time period.

[0081] Next, as Figure 5EAs shown, step 440 involves forming a third optical layer 153 on top of the first optical layer 151 and the second optical layer 152 to cover the first optical layer 151 and the second optical layer 152.

[0082] Understandably, the optical thin film 150 is provided to address the problem of degraded image quality at large viewing angles (side views). The optical thin film 150 is designed to include at least a first optical layer 151 having a first refractive index n1, a second optical layer 152 having a second refractive index n2, and a third optical layer 153 having a third refractive index n3. In some embodiments of this disclosure, the second refractive index n2 is greater than the first refractive index n1 and the third refractive index n3. In some embodiments, the second refractive index n2 is less than the first refractive index n1 and the third refractive index n3. The second optical layer 152 is formed in a trench of the first optical layer 151, and the thickness D of the second optical layer 152 is... s With the height H of the trench t The design satisfies the relation: 0.1H t <D s <0.8H t To balance the compensation intensity of CM and side view. At the same time, the image quality of the side view is not degraded.

[0083] Figure 6 A schematic diagram of a display device 600 according to an embodiment of this disclosure is provided. The display device 600 is similar to the display 100, but differs in that the optical film 150 is arranged vertically. Specifically, the substrate 154 is located adjacent to the second adhesive layer 140, and the third optical layer 153 is located away from the second adhesive layer 140. Although the optical film 150 is vertically inverted, its function is not affected by this arrangement. Therefore, the image quality of the display device 600 is as good as that of the display device 100.

[0084] Figure 7 A schematic diagram of the structure of an optical thin film 750 according to an embodiment of the present disclosure. The optical thin film 750 includes a first optical layer 151, a second optical layer 752, a third optical layer 153, and a substrate 154. The optical thin film 750 is similar to the optical thin film 150, but differs in that the second optical layer 152, which contains grooves in the first optical layer 151, is replaced by a second optical layer 752, wherein this second optical layer 752 is conformally formed with the first optical layer 151.

[0085] The optical thin film 750 functions similarly to the optical thin film 150. For example, as... Figure 8As shown, the optical thin film 750 receives light rays from the display DP passing through the third optical layer 153, and the optical thin film 750 outputs light rays from the display DP passing through the substrate 154. In other words, light rays from the display DP pass through the third optical layer 153 into the optical thin film 750, and then pass through the substrate 154 and exit the optical thin film 750. Specifically, light rays Ls at the positive viewing angle of the display DP pass through the third optical layer 153 into the optical thin film 750, and then the positive viewing angle light rays Ls split into light rays L... SD , where this ray L SD It passes through the substrate 154, exits the optical film 750, and passes through the light L. SD This achieves image quality compensation for wide viewing angles. To give another example, the light intensity L at the side viewing angle of the display's display (DP)... B The light rays pass through the third optical layer 153 and enter the optical thin film 750, then pass through the side-view light L. B Separated into light rays L B1 With L B2 Among them, light L B1 With L B2 The light passes through the substrate 154 and exits the optical film 750. The optical film 750 is capable of uniformly separating the light rays Ls at a positive viewing angle into light rays L. SD Furthermore, it significantly reduces the light intensity L corresponding to the positive viewing angle of the display device 100. B2 The intensity. A detailed description of the optical thin film 750 follows.

[0086] Assuming the optical structure of the first optical layer 151 has a height H t The second optical layer 752 has a thickness D s In embodiments of this disclosure, height H t With thickness D S The design satisfies the relationship: 0.1H t <D s <0.8H t Furthermore, the first optical layer 151 has a first refractive index n1, the second optical layer 752 has a second refractive index n2, and the third optical layer 153 has a third refractive index n3. Similar to the optical thin film 150, the second refractive index n2 is greater than the first refractive index n1 and the third refractive index n3, or the second refractive index n2 is less than the first refractive index n1 and the third refractive index n3.

[0087] The manufacturing method of the optical thin film 750 is similar to that of the manufacturing method 400 of the optical thin film 150, but the difference is that the optical thin film 750 has a high viscosity (for example, the viscosity of the material of the second optical layer 752 is greater than or equal to 30 cps), and therefore the optical thin film 750 maintains a shape conformal to the first optical layer when a certain period of time has elapsed.

[0088] Figure 9A schematic diagram of a display device 900 according to an embodiment of the present disclosure is provided. The display device 900 includes a display panel 110, a first adhesive layer 120, a polarizing layer 130, an optical thin film 150, and a backlight module 910. In this embodiment, the optical thin film 150 is disposed between the backlight module 910 and the display panel 110, and therefore the light provided to the display panel 110 through the backlight module 910 can be distributed through the optical thin film 150 to achieve high front brightness and better backlight quality.

[0089] While considerable detail has been described with reference to the specific embodiments described herein, other embodiments may also exist. Therefore, the concept and scope of the appended claims should not be limited to the description of the embodiments contained herein. Various modifications or variations that can form the structure of the invention will be apparent to those skilled in the art without departing from the scope or concept of the invention. Based on the foregoing, if any modifications or variations of the invention fall within the scope of the following claims, the invention is intended to cover such modifications and variations.

Claims

1. An optical thin film, characterized in that, The optical thin film contains: One substrate; A first optical layer is formed on the substrate, wherein the first optical layer has an optical structure comprising a plurality of trenches; A second optical layer is formed on the first optical layer; as well as A third optical layer covers the first optical layer and the second optical layer, wherein the third optical layer has an optical structure including a plurality of grooves; The second optical layer is composed of multiple optical components located in the grooves; The first optical layer has a first refractive index, the second optical layer has a second refractive index, and the third optical layer has a third refractive index, wherein the second refractive index is less than the first refractive index and the third refractive index; The thickness of the second optical layer is less than the height of the plurality of trenches; The optical structure of the first optical layer has a height H t And the second optical layer has the thickness D s And 0.1H t <D s <0.8H t .

2. The optical thin film as described in claim 1, characterized in that, The optical structure is a periodic structure.

3. The optical thin film as described in claim 2, characterized in that, The periodic structure is a sinusoidal structure.

4. The optical thin film as described in claim 1, characterized in that, The first optical layer, the second optical layer and the third optical layer are resin layers.

5. A display device, characterized in that, The display device includes: A monitor; and An optical thin film is disposed on the display and receives light emitted from the display, wherein the optical thin film comprises: One substrate; A first optical layer is formed on the substrate, wherein the first optical layer has an optical structure comprising a plurality of trenches; A second optical layer is formed on the first optical layer; and A third optical layer covers the first optical layer and the second optical layer, wherein the third optical layer has an optical structure including a plurality of grooves; The second optical layer is composed of multiple optical components located in the grooves; The first optical layer has a first refractive index, the second optical layer has a second refractive index, and the third optical layer has a third refractive index, wherein the second refractive index is less than the first refractive index and the third refractive index; The thickness of the second optical layer is less than the height of the plurality of trenches; The optical structure of the first optical layer has a height H t And the second optical layer has the thickness D s And 0.1H t <D s <0.8H t .

6. The display device as claimed in claim 5, characterized in that, The optical structure is a periodic structure.

7. The display device as claimed in claim 6, characterized in that, The periodic structure is a sinusoidal structure.

8. The display device as claimed in claim 5, characterized in that, The first optical layer, the second optical layer and the third optical layer are resin layers.

9. The display device as claimed in claim 5, characterized in that, The optical film receives light passing through the third optical layer from the display, and the optical film outputs light passing through the substrate from the display.

10. The display device as claimed in claim 5, characterized in that, The display is an LCD.

11. A display device, characterized in that, The display device includes: A display panel; A backlight module configured to emit light to the display panel; and An optical film is disposed between the display panel and the backlight module, and the optical film is used to distribute light emitted from the backlight module, wherein the optical film comprises: One substrate; A first optical layer is formed on the substrate, wherein the first optical layer has an optical structure comprising a plurality of trenches; A second optical layer is formed on the first optical layer; and A third optical layer covers the first optical layer and the second optical layer, wherein the third optical layer has an optical structure including a plurality of grooves; The second optical layer is composed of multiple optical components located in the grooves; The first optical layer has a first refractive index, the second optical layer has a second refractive index, and the third optical layer has a third refractive index, wherein the second refractive index is less than the first refractive index and the third refractive index; The thickness of the second optical layer is less than the height of the plurality of trenches; The optical structure of the first optical layer has a height H t And the second optical layer has the thickness D s And 0.1H t <D s <0.8H t .

Images