Stereoscopic image display device with multilayer functional film structure

Abstract

This invention relates to a stereoscopic image display device that improves the multilayer functional film structure applied to head-up display devices in vehicles and the like, thereby improving ease of manufacturing and uniformity of 3D resolution. According to the present invention, in a multilayer functional film structure applied to a head-up display device, a thick laminated base film is replaced with a glass plate, thereby minimizing the shrinkage and expansion rate of the lenticular lens, improving ease of manufacturing and uniformity of 3D resolution, and ensuring reliability. Furthermore, deformation of the lens layer can be prevented even if the thickness of the lenticular lens forming layer is minimized, and the structure for attaching the lens to the glass plate can be simplified to ensure lens uniformity and improve marketability. In addition, by combining two lenses with different refractive indices, the curvature can be reduced while increasing the height (SAG) of the lenticular lens, thereby eliminating difficulties in the manufacturing process and improving productivity.

Description

Technical Field

[0001] The present invention relates to a stereoscopic video display device having a multilayer functional film structure, and more particularly, to a stereoscopic video display device that improves the multilayer functional film structure applied to a head-up display device (hereinafter referred to as 'HUD device') such as a vehicle, and improves manufacturing convenience and uniformity of 3D resolution.

Background Art

[0002] The content described in this part only provides background information for embodiments of the present invention and does not constitute the prior art.

[0003] The application of head-up display devices has been increasing significantly in order to provide safety and comfort to drivers during driving. Instrument panel information such as vehicle speed, fuel level, engine revolutions per minute, and navigation information are displayed on the head-up display. In addition to such information, more diverse information can be provided through augmented reality applications.

[0004] For example, lane moving direction, hazards, pedestrian positions, and information about buildings ahead can be represented in alignment with objects or panoramas.

[0005] However, in existing head-up display devices, virtual images are displayed at a fixed distance (generally 2.5 m), and the horizontal viewing angle is also small, within 5 degrees. Recently, HUD devices that have improved the virtual image distance to 10 m and increased the horizontal viewing angle to 10 degrees have been developed or launched as prototypes. And there is an increasing demand to further expand the viewing angle to 20 degrees or more.

[0006] To realize this, it is necessary to use large display panels to solve the sunload issue caused by sunlight. However, as the panel size increases, a problem arises in 3D HUDs that use lenticular lenses: the thickness of the base film increases significantly. In addition, ensuring uniformity of the lenticular lens over a large area becomes extremely important.

[0007] On the other hand, if one attempts to manufacture a thick base film, multiple soft molding processes (base film layered structure) are required, which makes it difficult to ensure uniformity of the lenticular lens while also complicating the manufacturing process necessary to ensure 3D image quality.

[0008] Therefore, in order to provide a HUD that employs a large display panel, there was an urgent need to develop a new 3D optical multi-layer film structure that could ensure the uniformity of the lenticular lens while having a thin base film.

[0009] Prior art documents include Patent Document 1: Korean Published Patent Gazette No. 10-2022-0032448 (published March 15, 2022, title of invention: method and apparatus for correcting cross torque).

[0010] The aforementioned background technology cannot necessarily be considered publicly known technology that was disclosed to the general public before the filing of the invention of the embodiments, as it was either possessed by the inventor for the purpose of deriving the embodiments of the present invention or acquired during the derivation process. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Korean Patent Publication No. 10-2022-0032448 (Published March 15, 2022; Title of Invention: Method and Apparatus for Correcting Cross Torque) [Disclosure of the Invention] [Problems that the invention aims to solve]

[0012] To solve the problems of the conventional technology described above, the object of the present invention is to provide a stereoscopic image display device having a multilayer functional film structure that can replace a thick laminated base film with glass to minimize the shrinkage and expansion rate of the lenticular lens and ensure reliability.

[0013] Furthermore, an object of the present invention is to provide a stereoscopic image display device having a multilayer functional film structure that can minimize the thickness of the lenticular lens forming layer, prevent deformation of the lens layer due to load, simplify the structure, and ensure lens uniformity.

[0014] The object of the present invention is to provide a stereoscopic image display device having a multilayer functional film structure that can reduce curvature while forming a large lenticular lens height (SAG) by combining two lenses with different refractive indices, thereby overcoming the difficulties of the manufacturing process.

[0015] The technical problems that this invention aims to solve are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those with ordinary skill in the art to which this invention pertains from the description below. [Means for solving the problem]

[0016] To solve these technical problems, the present invention can be configured to include a backlight unit 10; a display panel 20 disposed in front of the backlight unit 10; and a multilayer 3D optical lens layer 30 disposed in front of the display panel 20, which has a glass substrate 21 front surface and is equipped with a first glass plate 50 and a polymer substrate lenticular lens array 40 for providing stereoscopic images.

[0017] Furthermore, the lenticular lens array 40 may be formed by including an adhesion layer 41 provided on the first glass plate 50; a lens layer 43 on which lenticular lenses are continuously arranged in front of the adhesion layer 41; and a protective layer 45 having a lower refractive index than the lens layer 43 and provided on the front of the lens layer 43.

[0018] Furthermore, the lenticular lens array 40 may be formed including an adhesive layer 41 provided on a first glass plate 50; a lens layer 43 on which lenticular lenses are continuously arranged in front of the adhesive layer 41; a protective layer 45 having a lower refractive index than the lens layer 43 and provided on the front of the lens layer 43; and a second glass plate 55 attached to the front of the protective layer 45.

[0019] Furthermore, the adhering layer 41 can be attached to the front surface of the first glass plate 50 in a dot or thin film form using one of the following methods: vapor deposition, printing, or coating.

[0020] Furthermore, the second glass plate 55 can be attached to the front surface of the protective layer 45 in the form of a thin film using either vapor deposition or printing.

[0021] Furthermore, the lenticular lens of the lens layer 43 can be configured to have a semicircular cross-section like "⌒" and be positioned in front of the adhesive layer 41 so as to provide different images to the user's left and right eyes, respectively, in order to provide a three-dimensional image. [Effects of the Invention]

[0022] According to such an invention, by replacing the multilayer functional film structure applied to a HUD device such as a vehicle with a thick laminated base film to minimize the shrinkage and expansion rates of the lenticular lens, it is possible to improve manufacturing convenience and the uniformity of 3D resolution and ensure reliability.

[0023] In addition, even if the thickness of the lenticular lens formation layer is minimized, deformation of the lens layer can be prevented, and the structure of attaching the lens to the glass plate can be simplified to ensure the uniformity of the lens and improve the commerciality.

[0024] And, by combining two lenticular lenses with different refractive indices from each other to form a large height (SAG) of the lenticular lens while reducing the curvature, the difficulty of the manufacturing process can be eliminated and productivity can be improved.

[0025] In addition, the effects of the present invention have various effects such as excellent versatility depending on the embodiments, and such effects can be clearly confirmed in the description part of the embodiments described later.

Brief Description of Drawings

[0026] [Figure 1] It is a schematic cross-sectional view of a stereoscopic video display device having a multilayer functional film structure according to the present invention. [Figure 2] It is a schematic cross-sectional view of a stereoscopic video display device having a multilayer functional film structure according to an embodiment of the present invention. [Figure 3] It is a schematic view showing the refractive index of a stereoscopic video display device having a multilayer functional film structure according to the present invention. [Figure 4] It is a graph comparing the lens shrinkage rates of a stereoscopic video display device having a multilayer functional film structure according to the present invention [Figure 5] It is a graph comparing the LCD surface temperatures of a stereoscopic video display device having a multilayer functional film structure according to the present invention. [Modes for carrying out the invention]

[0027] The advantages and features of the present invention, and the methods for achieving them, will become clear from the examples described in detail with the accompanying drawings. However, the present invention is not limited to the examples presented below and can be embodied in a variety of different forms, including all transformations, equivalents, or substitutes that fall within the spirit and technical scope of the present invention. The examples presented below are provided to ensure that the disclosure of the present invention is complete and to fully inform those who are ordinary skill in the art to which the present invention pertains. Where it is determined that a specific description of the relevant prior art would obscure the essence of the present invention, such detailed description will be omitted. The terminology used in this application is used solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless clearly intended to be otherwise in the context. In this application, terms such as “includes” or “having” are intended to specify the existence of features, figures, stages, operations, components, parts, or combinations thereof described in the specification, and should be understood not to preemptively exclude the existence or possibility of adding one or more other features, figures, stages, operations, components, parts, or combinations thereof. Terms such as “first,” “second,” etc., may be used to describe a variety of components, but the components should not be limited by such terms. Such terms are used solely for the purpose of distinguishing one component from other components. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. In the description with reference to the attached drawings, identical or corresponding components will be assigned the same drawing number, and redundant descriptions thereof will be omitted.

[0028] First, the backlight unit 10 emits a wide-angle light source onto its surface, and the two-dimensional image generated by the picture generation unit (PGU), which is composed of a display panel 20 positioned in front of the backlight unit 10, is transformed and transmitted to the automobile's windshield as a virtual image. The configuration of the backlight unit 10 and the display panel 20 can be applied in various ways according to the requirements of those skilled in the art, and is not limited to any particular configuration.

[0029] Furthermore, it is desirable that the backlight unit 10 be composed of a high-brightness backlight having a divergence angle of 10 degrees or less so that the image can be seen properly even under strong sunlight.

[0030] The present invention arranges a 3D optical lens layer 30 on the front of the display panel 20 to minimize the contraction or expansion rate of the lenticular lens array 40 in response to heat generated by the backlight unit 10 and sunlight, thereby improving the uniformity of the HUD 3D resolution provided to vehicles and the like.

[0031] To this end, a multilayer 3D optical lens layer 30 is installed on the front surface of the glass substrate 21 of the display panel 20, comprising a first glass plate 50 and a polymer substrate lenticular lens array 40 for providing a three-dimensional image. By positioning it to block heat transfer to the lenticular lens array 40 through the display panel, the rate of contraction or expansion of the lenticular lens array 40 due to the backlight unit 10 and sunlight can be minimized.

[0032] The lenticular lens array 40 is formed by including an adhesion layer 41 for fixing to one surface of a first glass plate 50 that is in contact with the glass substrate 21 of the display panel 20, as shown in Figure 1; a lens layer 43 on which lenticular lenses are continuously arranged in front of the adhesion layer 41; and a protective layer 45 having a lower refractive index than the lens layer 43 and provided on the front of the lens layer 43.

[0033] At this time, it is desirable that the lens layer 43 on which the lenticular lenses are arranged be made as thin as possible relative to the first glass plate 50, while also simplifying the structure so as to prevent deformation of the lens layer due to loads such as the protective layer and the second glass plate described later, thereby ensuring uniformity in the arrangement of the lenticular lenses.

[0034] Furthermore, the present invention also includes the formation of the lenticular lens array 40 as shown in Figure 2, comprising an adhesive layer 41 provided on a first glass plate 50, a lens layer 43 on which lenticular lenses are continuously arranged in front of the adhesive layer 41, a protective layer 45 having a lower refractive index than the lens layer 43 and provided on the front of the lens layer 43, and a second glass plate 55 attached to the front of the protective layer 45.

[0035] Therefore, the degree of contraction or expansion of the lenticular lens array 40 due to heat from sunlight is minimized to improve the uniformity of the HUD's 3D resolution.

[0036] Here, the adhering layer 41 can be attached to the front surface of the first glass plate 50 in a dot or thin film form by thin film treatment using one of the following methods: vapor deposition, printing, or coating.

[0037] The aforementioned adhesive layer 41 can be attached to the first glass plate 50 by using a transparent UV curing agent and irradiating it with ultraviolet light by operating an ultraviolet lamp at a certain distance away from the surface of the first glass plate 50. The ultraviolet light will pass through the transparent first glass plate, harden the UV curing agent, and the lens layer 43 can be attached to the first glass plate 50.

[0038] Furthermore, the lenticular lenses, which are uniformly arranged on the lens layer 43, are configured to provide a three-dimensional image by having a semicircular cross-section like "⌒" and being arranged in a fixed pattern that is continuously repeated on the front surface of the adhesive layer 41, so as to provide different images to the user's left and right eyes, respectively.

[0039] The lenticular lens exhibits an effect similar to that of a continuous, repeating arrangement of convex lenses, with the long-diameter horizontal cross-section arranged in the adhesive layer 41. It is desirable to configure the lenticular lens so that the overall short-diameter length is high while maintaining a small curvature, even if the long-diameter length is less than or equal to 2 to 3 times the short-diameter length of the arc shape.

[0040] Furthermore, a transparent protective layer 45 is attached to the front surface of the lenticular lens in the form of a thin film using one of the following methods: vapor deposition, printing, or coating. By using a UV curing agent and operating an ultraviolet lamp at a certain distance from the surface of the first glass plate 50 to irradiate it with ultraviolet light, the ultraviolet light penetrates the transparent first glass plate, hardening the UV curing agent and fixing the protective layer 45 to the front surface of the lenticular lens.

[0041] The protective layer 45 improves the surface density of the lens layer 43, preventing the moiré phenomenon in which the image transmitted through the lenticular lens is distorted into a wave pattern, thereby improving the uniformity of the 3D image.

[0042] In other words, in a lenticular lens having a semicircular shape, the change in curvature at the valley portion is relatively larger than the change in curvature at the apex portion, resulting in a difference in the amount of light transmitted between the vicinity of the apex and the valley portion of the lenticular lens, which causes moiré patterns in 3D images. However, by forming a protective layer 45 with a refractive index lower than the refractive index of the valley portion of the lenticular lens on the front surface of the lens layer 43, the uniformity of 3D resolution is improved.

[0043] The protective layer 45 is composed of a composition having a refractive index lower than that of the lenticular lens, and is molded while filling the valleys of the lenticular lens, thereby reducing the curvature even when the height of the lenticular lens is increased, thereby improving manufacturing convenience and the uniformity of 3D resolution.

[0044] Furthermore, as shown in Figure 3, the protective layer 45 filling the valley portion of the lenticular lens does not induce changes in the height (SAG) and curvature of the lenticular lens, so it does not matter if the protective layer 45 is formed to protrude from the apex of the lenticular lens.

[0045] The protective layer 45 is a composition in which transparent silicone (LSR; Liquid Silicone Rubber) with a light transmittance of 94% or more, a UV curing agent, and polyurethane acrylate are mixed in a ratio of approximately 3:6:1. Preferably, the polyurethane acrylate particles are mixed to have a size of 5 μm to 20 μm, and the present invention also includes a mixture of UV curing agent and polyurethane acrylate in a ratio of approximately 8:2.

[0046] A transparent second glass plate 55 is attached to the front surface of the protective layer 45. The second glass plate 55 has a thickness of at least 0.1 to 2T and is configured such that an adhesive layer, provided on one surface in the form of a thin film using either vapor deposition or printing, is attached to the front surface of the protective layer 45.

[0047] Therefore, the lenticular lens array 40 positioned in front of the first glass plate 50 can minimize the rate of contraction or expansion of the lenticular lens array 40 in response to heat from sunlight, thanks to the second glass plate 55.

[0048] Figure 4 is a graph comparing the shrinkage rates of an existing polymer synthetic resin film and a lenticular lens provided on a glass plate in response to heat generated by the backlight unit 10 and sunlight, showing that the 3D optical lens layer 30 configured as in the present invention has a low shrinkage rate.

[0049] Figure 5 is a graph showing the time it takes for the temperatures of the existing polymer synthetic resin material film and the first glass plate 50 to reach the surface temperature of the glass substrate 21 of the display panel 20. It can be seen that the temperature of the first glass plate 50, configured as in the present invention, reaches its temperature later than that of the polymer synthetic resin material film, thus improving reliability.

[0050] Therefore, the concept of the present invention should not be limited to the embodiments described above, and not only the claims described later, but also all scopes equivalent to or equivalently modified from these claims, fall within the scope of the concept of the present invention. [Explanation of symbols]

[0051] 10 Backlight 20 display panels 21 Glass substrate 30 3D Optical Lens Layers 40 Lenticular Lens Arrays 41 Adhesion layer 43 Lens layer 45 Protective layer 50 First glass plate 55. Second glass plate

Claims

1. Backlight unit 10; A display panel 20 positioned in front of the backlight unit 10; and The display panel 20 has a multilayer 3D optical lens layer 30 positioned on the front of the glass substrate 21, which includes a first glass plate 50 and a polymer substrate lenticular lens array 40, provided to deliver a stereoscopic image. A stereoscopic image display device having a multilayer functional film structure as described in feature 1.

2. The lenticular lens array 40 is Adhesion layer 41 provided on the first glass plate 50; A lens layer 43 in which lenticular lenses are continuously arranged on the front surface of the aforementioned adhesion layer 41; and Formed including a protective layer 45 provided on the front surface of the lens layer 43, having a refractive index lower than that of the lens layer 43; A stereoscopic image display device having a multilayer functional film structure as described in claim 1.

3. The lenticular lens array 40 is Adhesion layer 41 provided on the first glass plate 50; A lens layer 43 in which lenticular lenses are continuously arranged on the front surface of the aforementioned adhesion layer 41; A protective layer 45 having a refractive index lower than that of the lens layer 43 and provided on the front surface of the lens layer 43; and Formed including a second glass plate 55 attached to the front surface of the protective layer 45; A stereoscopic image display device having a multilayer functional film structure as described in claim 1.

4. The aforementioned adhesive layer 41 is The material is attached to the front surface of the first glass plate 50 in a dot or thin film form using one of the following methods: vapor deposition, printing, or coating. A stereoscopic image display device having a multilayer functional film structure according to claim 2 or 3.

5. The second glass plate 55 is The protective layer 45 is formed by adhering it to the front surface in the form of a thin film using either vapor deposition or printing. A stereoscopic image display device having a multilayer functional film structure as described in claim 3.

6. The lenticular lens of the lens layer 43 is To provide a three-dimensional image, a semicircular cross-section, such as a "⌒", is placed on the front surface of the adhesive layer 41, providing different images to the user's left and right eyes, respectively. A stereoscopic image display device having a multilayer functional film structure according to claim 2 or 3.

Images