Glass substrate for stereoscopic display and non-contact operation device provided with the same

Abstract

The present application provides a kind of cheap and can make observer visual confirmation stereoscopic vision image without increasing the number of components stereoscopic display glass substrate and non-contact operation device.Stereoscopic display glass substrate (10) is configured to appear stereoscopic vision image using binocular parallax by the light irradiated.The stereoscopic display glass substrate (10) is provided with the stereoscopic display area (100) configured based on the shape of the image to be stereoscopically displayed with multiple stereoscopic display micro grooves (circular arc micro groove (102)).The stereoscopic display area (100) is configured to enable the observer to visually confirm the stereoscopic vision image at a position away from the substrate surface by at least one of scattering, refraction and reflection of the light irradiated to the multiple stereoscopic display micro grooves.

Description

Technical Field

[0001] The present invention relates to a glass substrate for a stereoscopic display, for example, an operation panel applicable to a non-contact operation device, and a non-contact operation device having the same. Background Technology

[0002] Operating devices typically have a control panel that accepts user input such as pressing buttons, and outputs signals corresponding to the user's pressing of operation buttons, guide markers, etc., on the control panel, thereby causing the electronic device being operated to function. In the past, various developments have been undertaken to improve the convenience and design of control panels, and operating devices have indeed made significant progress.

[0003] However, in recent years, from the perspective of preventing the spread of infectious diseases through contact, the demand for touchless operations that can be performed has increased dramatically.

[0004] Therefore, with a focus on touchless operation devices, most touchless operation devices have previously adopted a structure that includes a stereoscopic vision image for operation guidance that floats up from the control panel toward the user and a detection unit that detects the presence of the operator's fingers.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 10-223102

[0008] Patent Document 2: Japanese Patent Application Publication No. 2012-194617 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, most of the previous touchless operation devices required expensive imaging units such as refractive index distribution lens elements, making it difficult to achieve touchless operation at a low cost.

[0011] Even if the imaging unit is made cheaper, there is still a problem that the number of parts increases because it needs to have a unit that displays the original drawing for guiding the operation and a stereoscopic image reproduction unit for viewing the original drawing in stereo.

[0012] The purpose of this invention is to provide a low-cost glass substrate for stereoscopic display and a non-contact operation device that allows an observer to visually confirm a stereoscopic image without increasing the number of components.

[0013] Technical solutions for solving the problem

[0014] The stereoscopic display glass substrate of this invention is configured to display a stereoscopic image using binocular parallax when illuminated by light. Examples of stereoscopic images include guide marks for operation guidance, images of text information, and images used to improve aesthetics and visual confirmation (decorative patterns, logos, etc.).

[0015] Such stereoscopic display glass substrates are used, for example, to guide the operator's hand in a non-contact operating device. However, they are not limited to this application; they can also be used as protective glass for portable terminals or as decorative glass for the back.

[0016] The glass substrate for stereoscopic display includes a stereoscopic display area having multiple stereoscopic display microgrooves arranged according to the shape of the image to be stereoscopically displayed. This stereoscopic display area is configured such that by causing light irradiated onto the multiple stereoscopic display microgrooves to undergo at least one of scattering, refraction, and reflection, an observer can visually confirm a stereoscopic image at a position away from the substrate surface.

[0017] Typically, light incident on a micro-groove used in a stereoscopic display undergoes directional scattering, refraction, or reflection within a plane perpendicular to the groove. When presenting a stereoscopic image to the operator, one or more of these optical phenomena can be used simultaneously, either scattering, refraction, or reflection.

[0018] Light illuminating the microgroove used in the stereoscopic display undergoes directional scattering, refraction, and reflection within the microgroove, thus becoming bright spots that form the image. These bright spots then reach the observer's left and right eyes as images for the left and right eyes, respectively. By creating this binocular parallax, the observer can visually confirm the stereoscopic image.

[0019] As an example of enabling observers to visually confirm the structure of a stereoscopic image, the principle of a 3D display technology known as arc 3D, which uses directional light scattering, can be cited, but the principle itself is already known.

[0020] However, those that were previously difficult to apply to decorative purposes such as non-touch control panels or portable terminal devices in conventional curved 3D designs are appropriately applied in this invention.

[0021] Previous curved 3D technology achieved this by creating arc-shaped damage on the main surface of the plastic sheet. However, the scattering caused by the deterioration of the plastic or the fine structure of the damaged surface is significant. In particular, there is the issue of diffuse reflection at the points where the damage intersects.

[0022] Furthermore, previous arc-shaped 3D technology required time and cost in processing to create arc-shaped damage, making it difficult to utilize in industry. Moreover, if directly applied to control panels, the arc-shaped damage itself would be obvious, compromising the aesthetics of the control panel, thus preventing its practical application.

[0023] In contrast, in this invention, the curved 3D technology is appropriately applied to a glass substrate and successfully put into practical use by applying it to touchless operation panels, etc.

[0024] The aforementioned micro-grooves for stereoscopic displays are inconspicuous grooves set on a transparent glass substrate. Unlike damage, the micro-grooves themselves are almost invisible to the operator's eyes. Therefore, the presence of micro-grooves for stereoscopic displays is unlikely to impair the aesthetics.

[0025] The microgroove for stereoscopic display is preferably arc-shaped, but even a curve that includes an arc portion or a shape obtained by combining it with straight lines can appropriately perform the stereoscopic display function. In addition, even if the microgroove for stereoscopic display is composed of only straight lines, only the distance of the stereoscopic image increases or the viewing distance increases, without losing the stereoscopic display function itself.

[0026] Examples of methods for forming microgrooves for stereoscopic displays relative to plate-shaped glass include etching processes such as wet etching or dry etching, and laser-assisted etching processes in which laser processing is used, but are not limited to these.

[0027] In the above structure, there is no need to set up expensive imaging units such as refractive index distribution lens elements for imaging the guide marks used for operation guidance in the air, or stereoscopic image reproduction units for viewing the guide marks in three dimensions.

[0028] In the above structure, it is preferable that the microgroove for stereoscopic display has an etched surface inside. An etched surface refers to a smooth surface obtained through chemical treatment such as etching (with lower surface roughness compared to physical treatment). By having such an etched surface, for example, the surface roughness of the glass can be reduced to about 100 nm, thus preventing diffuse reflection of light and easily achieving directional properties.

[0029] In addition, the preferred configuration is that the microgroove for stereoscopic display has a metal layer at the bottom, and the metal layer reflects at least a portion of visible light.

[0030] By setting up such a metal layer, the reflection of light makes it easy for observers to visually confirm the stereoscopic image.

[0031] In addition, a preferred configuration is to provide a metal layer on the main surface opposite to the main surface where the microgroove for stereoscopic display is provided, wherein the metal layer reflects a portion of the visible light and transmits another portion.

[0032] By employing such a structure, light is colored as it passes through the metal layer, enabling observers to visually confirm a vivid stereoscopic image.

[0033] Alternatively, a non-contact operation device is preferably configured to include at least: the aforementioned stereoscopic display glass substrate; a light source configured to illuminate the stereoscopic display glass substrate; and a detection unit configured to detect the operator's operation on the position of the image on which the guide mark is formed.

[0034] Based on such a non-contact operating device, a touchless operating device with high effectiveness in preventing contact infection can be realized with a simple structure and at low cost.

[0035] Invention Effects

[0036] According to the present invention, a stereoscopic display glass substrate and a non-contact operation device are realized, which are inexpensive and enable an observer to visually confirm a stereoscopic image without increasing the number of components. Attached Figure Description

[0037] Figure 1 This is a diagram illustrating the schematic structure of a touchless operation device according to one embodiment of the present invention.

[0038] Figure 2 This is a diagram illustrating the general structure of a glass substrate used for stereoscopic displays.

[0039] Figure 3 This diagram illustrates an example of laser processing in the manufacturing process of glass substrates for stereoscopic displays.

[0040] Figure 4 This diagram illustrates an example of the etching process in the manufacturing process of a glass substrate for stereoscopic displays.

[0041] Figure 5 This is a diagram illustrating an example of deformation during the etching process in the manufacturing process of a glass substrate for stereoscopic displays.

[0042] Figure 6 This is a diagram illustrating another example of the manufacturing process for a glass substrate used in stereoscopic displays.

[0043] Figure 7 This is a diagram illustrating another example of the manufacturing process for a glass substrate used in stereoscopic displays.

[0044] Figure 8 This is a diagram showing an example of a variation of the guide mark used for operation guidance.

[0045] Figure 9 This is a diagram illustrating an example of a deformation of the structure of a glass substrate for stereoscopic display.

[0046] Figure 10 This is a diagram illustrating an example of a structure in which a metal layer is disposed on a glass substrate for stereoscopic display.

[0047] Figure 11 This diagram illustrates an example of using a stereoscopic display glass substrate for the back glass of a portable terminal device.

[0048] Figure 12 These are diagrams illustrating other examples of the structure of microgrooves used in stereoscopic displays. Detailed Implementation

[0049] Figure 1 (A) represents a schematic diagram of a touchless operation device 30 for a stereoscopic display glass substrate according to an embodiment of the present invention. The touchless operation device 30 is an operation device capable of performing non-contact operations. The touchless operation device 30 includes at least a stereoscopic display glass substrate 10, a light source 12, a sensor 14, and a control unit (not shown) that comprehensively controls the operation of each part of the control device.

[0050] The stereoscopic display glass substrate 10 is a transparent plate and has a stereoscopic display area 100. The stereoscopic display area 100 is configured to scatter light emitted from the light source 12 so that an operator at the viewpoint 40 can see the guide mark image 20 from a position away from the main surface of the stereoscopic display glass substrate 10.

[0051] In this embodiment, a bell-shaped marker is used as a guide marker for stereoscopic display (floating display). The guide marker image 20, which is shaped like a bell, can be seen at a distance D from the main surface of the stereoscopic display glass substrate 10.

[0052] The light source 12 is configured, for example, to illuminate the glass substrate 10 for stereoscopic display with highly directional light, such as LED units. The higher the directionality of the light from the light source 12, the brighter the bright spot pattern constituting the guide mark image 20 appears. Therefore, the appropriate directional light source 12 can be selected according to the brightness required for the guide mark image 20.

[0053] Sensor 14 is configured to detect the presence of an operator's finger at the location where the guide mark image 20 is formed. An infrared sensor can be cited as an example of the structure of sensor 14.

[0054] However, other types of sensors can also be used (e.g., optical sensors that detect the presence of an operator's finger at the measurement location based on the detection state of reflected or transmitted light illuminating the location to be measured).

[0055] Here, use Figure 1(B) will be described in more detail regarding the stereoscopic display area 100 described above. The stereoscopic display area 100 has a plurality of arc-shaped microgrooves 102 (corresponding to the stereoscopic display microgrooves of the present invention) designed according to a given rule based on the shape of the desired guide mark.

[0056] The stereoscopic display area 100 utilizes the light scattering characteristics of multiple arc-shaped micro-grooves 102 to enable stereoscopic viewing of desired guide marks.

[0057] like Figure 1 As shown in (C), this utilizes the principle that the part that meets the condition of being connected to the circle 70 with the straight line 60 connecting the position of the light source 12 and the viewpoint 40 as the axis appears brighter (as the principle of so-called ARC3D (arc 3D), the principle of which was studied by many researchers, led by WTPlummer in 1992).

[0058] Multiple arc-shaped microgrooves 102 disposed in the stereoscopic display area 100 have many... Figure 1 The portion where the circle 70 is connected, as shown in (C), appears brighter to the operator viewing from viewpoint 40. However, even when a straight stereoscopic display micro-groove is used instead of the arc-shaped micro-groove 102, the stereoscopic display function itself is not lost because the portion where the circle 70 is connected appears selectively brighter.

[0059] In the so-called curved 3D display technology, a plurality of arc-shaped microgrooves 102 are provided in the stereoscopic display area of ​​the stereoscopic display glass substrate 10. By illuminating them with a light source 12, a stereoscopic image (guide mark image 20) of the desired guide mark shape can be displayed.

[0060] Here, light is incident on multiple arc-shaped micro-grooves 102. When the light is directional and undergoes scattering, refraction, or reflection in each arc-shaped micro-groove 102, the light is strongly radiated from the arc-shaped micro-grooves 102 in a conical direction, and is perceived as a bright spot by the operator at the viewpoint 40.

[0061] Furthermore, it utilizes the phenomenon that a bright spot in an arc shape moves continuously along the arc along with the movement of the viewpoint 40. In the left and right eyes, since the positions of the viewpoint 40 are different, images with different parallaxes are incident on each eye, suggesting that the operator obtains a sense of depth through continuous stereoscopic vision.

[0062] Next, use Figure 2 (A) Figure 2(C) will be described in more detail regarding the stereoscopic display area 100 described above. As shown in these figures, in the stereoscopic display area 100, the arc-shaped microgrooves 102 are each in the form of an arc shape with a given radius and a given angle centered on each of the plurality of points 80 constituting the guide mark to be stereoscopically displayed, in other words, points (pixels) arranged at a given interval along the shape of the guide mark.

[0063] The spacing of the multiple dots 80 constituting the guide mark can be appropriately determined based on the width of the achievable arc-shaped microgroove 102, etc. By setting the dots 80 at intervals of about 0.5 to 20 mm (usually about 0.5 to 1 mm), a guide mark image 20 with a resolution suitable for guiding operations can be formed.

[0064] From this, we can know Figure 1 The distance D shown in (A) is affected by Figure 2 The influence of the radius R of the arc-shaped microgroove 102 shown in (C).

[0065] For example, the larger the radius R, the greater the distance D (depth). Furthermore, the larger the angle (angle of incidence) of the light emanating from the light source 12 relative to the stereoscopic display glass substrate 10, the smaller the distance D (depth). Moreover, even if the operator's viewpoint 40 is effectively changed left or right, the distance D (depth) remains almost unchanged.

[0066] Next, use Figures 3-5 An example of a method for manufacturing a glass substrate 10 for stereoscopic display will be described.

[0067] First, such as Figure 3 (A) and Figure 3 As shown in (B), the laser beam is scanned at a predetermined position for forming an arc-shaped microgroove 102, which is determined by the shape of the desired guide mark, to form a modified line 104 for forming the microgroove.

[0068] There are no limitations on the type and irradiation conditions of a laser beam as long as it can modify the predetermined position of the arc-shaped microgroove 102 in the glass substrate 10 for stereoscopic display to be easily etchable.

[0069] In this embodiment, a laser beam oscillating from a short-pulse laser (e.g., a picosecond laser or a femtosecond laser) is irradiated from the laser head, but gas lasers such as CO2 lasers or other types of lasers may also be used. In this embodiment, the output is controlled such that the average laser energy of the laser beam is approximately 10 μJ to 1000 μJ.

[0070] The modified line 104 formed at the predetermined position of the arc-shaped microgroove 102 is, for example, in the shape of a filament array with multiple filament layers arranged thereon. These multiple filament layers are formed by laser beam pulses (with a beam diameter of about 1 to 10 μm) irradiated from a pulsed laser such as a picosecond laser or a femtosecond laser.

[0071] The shape of the modified line 104 is not limited to a specific shape, as long as it has the property that it is easier to etch than other parts of the glass substrate 10 for stereoscopic display.

[0072] The laser beam preferably has its focusing area appropriately adjusted. Here, the depth of the arc-shaped microgroove 102 is adjusted by appropriately adjusting the focusing area of ​​the laser beam.

[0073] After the modified line 104 is formed through the aforementioned laser processing, an etching process is performed to cause the modified portion to dissolve more rapidly than other parts, such as... Figure 3 As shown in (C), the modified line 104 becomes an arc-shaped microgroove 102.

[0074] Here, regarding the etching process in this embodiment, the following is used: Figure 4 (A) and Figure 4 (B) will be explained simply. The aforementioned stereoscopic display glass substrate 10 is etched by being introduced into the etching apparatus 50.

[0075] Here, for example, an etching process based on an etching solution containing hydrofluoric acid and hydrochloric acid is performed. Typically, an etching solution containing approximately 1 to 10% by weight of hydrofluoric acid and 5 to 20% by weight of hydrochloric acid is used, and surfactants are added as needed.

[0076] In the etching apparatus 50, while conveying the stereoscopic display glass substrate 10 by a conveying roller, the etching solution is brought into contact with the main surface of the stereoscopic display glass substrate 10 in the etching chamber 52, thereby performing etching processing on the stereoscopic display glass substrate 10.

[0077] Furthermore, a cleaning chamber for rinsing off the etching solution adhering to the stereoscopic display glass substrate 10 is provided at the rear of the etching chamber 52 in the etching apparatus 50. Therefore, the stereoscopic display glass substrate 10 is discharged from the etching apparatus 50 with the etching solution removed.

[0078] As described above, by appropriately performing laser irradiation modification and etching processes on the locations on the glass substrate 10 for stereoscopic display where the arc-shaped microgrooves 102 are to be formed, fine and smooth arc-shaped microgrooves 102 can be achieved. Moreover, a smooth surface with almost no damage is formed on the surface of the arc-shaped microgrooves 102.

[0079] A representative example of a method for bringing the etching solution into contact with the glass substrate 10 for stereoscopic display is as follows: Figure 4 (B) and Figure 5 As shown in (A), a single-piece and jet-type etching process is performed in each etching chamber 52 of the etching apparatus 50, where etching solution is sprayed onto the glass substrate 10 for stereoscopic display.

[0080] However, etching is not limited to jet etching, such as... Figure 5 As shown in (B), the overflow etching process can also be carried out in an overflow etching chamber 54, where the glass substrate 10 for stereoscopic display is transported while in contact with the overflowing etching solution.

[0081] In addition, such as Figure 5 As shown in (C), an immersion etching method can also be used, in which the single or multiple stereoscopic display glass substrates 10 housed in the carrier are immersed in an etching tank 56 containing etching solution.

[0082] Through the etching process described above, the modified lines 104 at predetermined positions for forming the arc-shaped microgroove 102 dissolve, thus forming the arc-shaped microgroove 102. Using this method, it is possible to form an arc-shaped microgroove 102 with its width minimized to the limit. The width of the arc-shaped microgroove 102 can be appropriately adjusted within a range of approximately 5 μm to 500 μm.

[0083] In this embodiment, the arc-shaped microgroove 102 is made less noticeable by having a width of 500 μm or less. In particular, if the width of the arc-shaped microgroove 102 is 100 μm or less, the arc-shaped microgroove 102 is almost impossible to visually confirm without conscious effort.

[0084] The depth of the arc-shaped microgroove 102 is not limited to a specific range, but it generally has the advantage that the greater the depth, the brighter the guide mark image 20 becomes. On the other hand, it has the disadvantage that the arc-shaped microgroove 102 is easily visible. Therefore, a suitable depth (generally about 1 μm to 100 μm) can be appropriately set according to the application of the non-touch operation device 30.

[0085] In addition, to further improve the production efficiency of the aforementioned stereoscopic display glass substrate 10, it is also possible to... Figure 6 (A) and Figure 6 As shown in (B), a method is adopted to perform laser processing or etching on the glass substrate 200 used for multi-beveling of the glass substrate 10 for stereoscopic display, and then to separate it.

[0086] For example, such as Figure 6 As shown in (A), a glass substrate 200, in which multiple regions of the glass substrate 10 to be used for stereoscopic display are arranged in a matrix of 4 rows × 4 columns, can be divided into 16 glass substrates 10 for stereoscopic display by scribing and breaking.

[0087] Besides the scribing and breaking method, etching can also be used for separation. In the case of separation by etching, after covering the two main surfaces (end surfaces as needed) of the glass substrate 200 with a protective film, the protective film corresponding to the cutting part is removed before etching.

[0088] By using the stereoscopic display glass substrate 10 manufactured by the above method in the non-touch operation device 30, various operation buttons can be made non-touch (contactless).

[0089] Specifically, the guide mark image 20 floats in the air from the stereoscopic display glass substrate 10, allowing for easy touchless operation while being guided by the guide mark image 20 in the air.

[0090] In this way, by achieving smooth touchless operation, the touchless operation device 30 equipped with the 3D display glass substrate 10 can be effectively used as a touchless interface to prevent contact infection.

[0091] By making door switches or light switches in public spaces touchless, a higher level of contact infection prevention can be expected. For example, by making various buttons in elevators or restrooms, which are touched by an uncertain number of people, touchless, the risk of contracting infectious diseases can be reduced.

[0092] In particular, compared to touchless interfaces achieved solely through sensors, the guidance provided by floating markers like 20 makes it easier to determine where to move the finger within the available space, thus enabling a user-friendly touchless interface for people of all ages and genders.

[0093] As in this embodiment, by providing a three-dimensional display glass substrate 10 and a plurality of fine and smooth arc-shaped microgrooves 102 on a transparent glass substrate, the desired air guidance display of the guide mark can be achieved. Moreover, since the operator can hardly see the arc-shaped microgrooves 102 themselves, the presence of the arc-shaped microgrooves 102 will not impair the aesthetics.

[0094] The glass substrate 10 for stereoscopic display is made of glass with excellent chemical resistance, so it will not deteriorate even when wiped with disinfectants such as alcohol or sodium hypochlorite.

[0095] Moreover, glass generally has higher transparency compared to resins, so even when the glass substrate 10 for stereoscopic display is attached to doors or wall materials, their aesthetics will not be compromised.

[0096] Moreover, even when the glass substrate 10 for three-dimensional display is attached to the surface of a glass mirror or a liquid crystal panel, deformation caused by a difference in thermal expansion is not likely to occur because the thermal expansion rate is substantially equal to that of these glasses.

[0097] In the above-described embodiment, an example of manufacturing the glass substrate 10 for three-dimensional display by laser processing and etching has been described, but the manufacturing method of the glass substrate 10 for three-dimensional display is not limited thereto.

[0098] For example, as shown in (A) of Figure 7 to (D) of Figure 7 it is also possible to use a method in which a masking agent 106 having etching liquid resistance is coated on the glass substrate 10 for three-dimensional display, and after removing the masking agent 106 so as to expose only the formation positions of the arc-shaped fine grooves 102, an etching process is performed.

[0099] As the masking agent 106, an acid-resistant resist or acid-resistant film, or a metal mask such as a chromium mask or tungsten mask can be appropriately used. Since the masking agent 106 needs to be peeled off as shown in (D) of Figure 7 after the arc-shaped fine grooves 102 are formed, it is preferable to appropriately select also considering the peelability.

[0100] In the case of using such a masking agent 106, the above-described wet etching can be performed, but the arc-shaped fine grooves 102 can also be formed by performing dry etching.

[0101] Here, since the brightness and depth of the guiding marker image 20 change according to the smoothness of the arc-shaped fine grooves 102 after the etching process, it is preferable to adjust the smoothness of the arc-shaped fine grooves 102 by adjusting the etching process conditions according to the specifications of the desired guiding marker image 20.

[0102] In addition, in the present embodiment, as the guiding marker image 20 for touchless operation, the marker of a calling bell as shown in (A) of Figure 8 is adopted, but the structure of the guiding marker image 20 is not limited thereto.

[0103] For example, numbers indicating the floors of an elevator as shown in (B) of Figure 8 can also be adopted as the guiding marker image 20, and Chinese characters such as "call" as shown in (C) of Figure 8 can also be adopted as the guiding marker image 20.

[0104] In addition, other than this, a marker of a switch for switching on and off lighting, various other characters, icons, pictorial characters, etc. can be used as the guiding marker image 20.

[0105] In addition, a touchless operation device 30 can be configured as follows: instead of a single guide mark image 20, multiple guide mark images 20 are displayed simultaneously at multiple locations, and processing corresponding to the guide mark image 20 at the detected position of the operator's finger is performed.

[0106] For example, by being able to input the floor number using 10 or more guide markers like 20, the touchless operation device 30 can be used as an elevator operation device.

[0107] In the above embodiment, the operator can see the guide mark image 20 by using transmitted light from the light source 12, but a structure that uses not only transmitted light but also reflected light can also be adopted.

[0108] In addition, it can also be like Figure 9 As shown in (A), the arc-shaped microgroove 102 of the stereoscopic display glass substrate 10 is configured such that the cover glass 108 covers the microgroove. In this case, a filler (adhesive, etc.) with a desired refractive index can be filled into the space formed by the cover glass 108 and the arc-shaped microgroove 102. For example, if a material with a higher refractive index than glass is used as the filler, the same optical effect as when a convex portion is arranged in the groove portion can be obtained.

[0109] By using such a cover glass 108, the dustproof and dirt-prevention effects of the arc-shaped micro-groove 102 can be improved. Therefore, it is possible to prevent the undesirable situation of directional light scattering failing to occur in the arc-shaped micro-groove 102 over time.

[0110] In addition, such as Figure 9 As shown in (B), arc-shaped microgrooves 102 can also be provided on both sides of the glass substrate 10 for stereoscopic display. With this structure, the arc-shaped microgrooves 102 can be prevented from intersecting and can be arranged more closely. As a result, the number of intersections of the arc-shaped microgrooves 102 is reduced, diffuse reflection is less likely to occur, and thus directivity can be improved.

[0111] Similarly, as Figure 9 As shown in (C), by stacking the glass substrate 10 for stereoscopic display, it is also possible to prevent the arc-shaped microgrooves 102 from intersecting and to arrange them more closely. At this time, if the glass substrate 10 for stereoscopic display is made ultra-thin, the number of layers can also be increased.

[0112] like Figure 9 (B) and Figure 9 As shown in (C), when the arc-shaped microgroove 102 is set on different planes, the arc-shaped microgroove 102 can also be set in a way that reproduces the bi-ocular parallax (motion parallax) of mutually orthogonal directions on the first and second planes.

[0113] By employing such a structure, it is possible to display stereoscopic images with bi-ocular parallax (motion parallax) in both vertical and horizontal directions. For example, not only in scenes where the viewpoints 40 of the left and right eyes differ in the left-right direction (horizontal direction), but also in scenes where the viewpoints 40 of the left and right eyes differ in the vertical direction (vertical direction) (e.g., scenes where the face is tilted or lying down), the operator can also obtain a sense of stereoscopic depth and see a stereoscopic image.

[0114] In addition, such as Figure 10 As shown in (A), a metal layer 110 can also be provided at the bottom of the arc-shaped microgroove 102. By configuring such a metal layer 110 to reflect at least a portion (e.g., about 70%) of visible light, it is possible to allow an observer to visually confirm the stereoscopic image while reflecting light incident from the outside.

[0115] In addition, such as Figure 10 As shown in (B), a metal layer 112 can also be provided on the main surface opposite to the main surface in the glass substrate 10 for stereoscopic display where the arc-shaped microgrooves 102 are provided. By configuring the metal layer 112 to reflect a portion of visible light and allow the other portion to pass through (for example, reflecting about 30% and allowing about 70% to pass through), an observer can visually confirm the stereoscopic image formed by the light passing through the metal layer 112. Such stereoscopic images generally tend to be viewed with more vivid colors.

[0116] As an example of a method for forming the aforementioned metal layers 110 and 112, vapor deposition processes such as non-conductive vacuum metallization can be cited. However, metal layers 110 and 112 can also be formed by other film-forming processes including electroless plating or coating.

[0117] Examples of materials that can be used for the metal layers 110 and 112 include chromium, tungsten, or their alloys. In addition, indium alloys can also be used to form the metal layers 110 and 112 appropriately.

[0118] By allowing light to pass through or be reflected by the metal layers 110 and 112, such as Figure 11 As shown, the stereoscopic display glass substrate 10 is used as decorative glass for the portable terminal device 90, enabling the observer to visually confirm stereoscopic images such as colored logos.

[0119] In the case of using transmitted light instead of reflected light, for example, by appropriately adjusting the light illumination by combining louvers in a surface light source or prism sheets or light guide plates in a point light source, it is possible to form... Figure 11 The stereoscopic image shown.

[0120] In the above embodiment, an arc-shaped microgroove 102 was described as a microgroove for stereoscopic display (line drawing or image forming), but an arc-shaped microgroove 102 can also be used. Figure 12 (A) and Figure 12 The line 105 is shown in (B).

[0121] The scribing line 105 is essentially constructed by dividing the arc-shaped microgroove 102. Dividing the arc-shaped microgroove 102 laterally and staggering the divided grooves longitudinally offers advantages in terms of compacting the arc-shaped scribing within a rectangular frame. Arranging them in a grid pattern prevents the formation of intersections that are difficult to selectively illuminate. Furthermore, since the scribing line 105 is housed within a rectangular frame, it is easier to control the light distribution characteristics.

[0122] As the number of such lines 105 increases, the process becomes complicated if they are formed by physical methods such as cutting plotters. However, by using chemical processes such as etching, the lines 105 can be formed more easily.

[0123] It should be considered that the description of the above embodiments is illustrative in all respects and is not limiting. The scope of the invention is not defined by the above embodiments, but by the scope of the patent claims. Furthermore, the scope of the invention includes all modifications within the meaning and scope equivalent to the scope of the patent claims.

[0124] Label Explanation

[0125] 10: Glass substrate for stereoscopic display

[0126] 12: Light source

[0127] 14: Sensors

[0128] 20: Guide marker image

[0129] 30: Touchless operating device

[0130] 100: Guide mark formation area

[0131] 102: Arc-shaped microgroove

[0132] 110, 112: Metal layer.

Claims

1. A glass substrate for stereoscopic display, configured to display a stereoscopic image using binocular parallax by means of illuminated light, characterized in that... The glass substrate for the stereoscopic display is a transparent plate. The stereoscopic display glass substrate has a stereoscopic display area, which is provided with a plurality of stereoscopic display microgrooves arranged according to the shape of the image to be stereoscopically displayed. The stereoscopic display area is configured to cause light irradiated onto the plurality of stereoscopic display micro-grooves to undergo at least one of scattering, refraction, and reflection, thereby enabling an observer to visually confirm a stereoscopic image at a position away from the substrate surface. The microgroove for the stereoscopic display has a metal layer at the bottom, the metal layer being configured to reflect at least a portion of visible light.

2. A glass substrate for stereoscopic display, configured to display a stereoscopic image using binocular parallax by means of illuminated light, characterized in that... The glass substrate for the stereoscopic display is a transparent plate. The stereoscopic display glass substrate has a stereoscopic display area, which is provided with a plurality of stereoscopic display microgrooves arranged according to the shape of the image to be stereoscopically displayed. The stereoscopic display area is configured to cause light irradiated onto the plurality of stereoscopic display micro-grooves to undergo at least one of scattering, refraction, and reflection, thereby enabling an observer to visually confirm a stereoscopic image at a position away from the substrate surface. A metal layer is provided on the main surface opposite to the main surface where the microgroove for stereoscopic display is provided. The metal layer is configured to reflect part of visible light and transmit another part.

3. The glass substrate for stereoscopic display according to claim 1 or 2, characterized in that, The microgrooves used for the stereoscopic display have etched surfaces inside.

4. A non-contact operating device, comprising at least: Glass substrate for stereoscopic display according to any one of claims 1 to 3; A light source, configured to illuminate the glass substrate for the stereoscopic display; and The detection unit is configured to detect the observer's action on the position of the image on which the stereoscopic display is formed.

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