High-transmittance peep-proof device and peep-proof display device

Abstract

The invention discloses a high-transmittance peep-proof device and a peep-proof display device.The peep-proof device comprises an upper substrate at the light emitting end, a lower substrate at the light incident end and a peep-proof structure arranged between the upper substrate and the lower substrate, the peep-proof structure comprises a plurality of light passing cylinders arranged side by side, and each light passing cylinder is a cylinder with one large end and one small end; the large ends of the light-passing columns are connected with the upper substrate, the small ends of the light-passing columns are connected with the lower substrate, shading gaps are formed between the adjacent light-passing columns, and the side walls of the light-passing columns are arranged in the mode that light entering the light-passing columns can only be reflected and cannot be transmitted on the side walls, so that all the light entering the light-passing columns is emitted from the upper substrate at a small angle. On the premise that the peep-proof requirement is met, the transmittance is greatly improved.

Description

Technical Field

[0001] The invention relates to an anti-peeping device, in particular to a high-transmittance anti-peeping device and a preparation method thereof and an anti-peeping display device. Background Art

[0002] In recent years, liquid crystal displays have been widely used in various display devices, and are increasingly closely related to people's lives. Liquid crystal displays, since they cannot emit light by themselves, need to be equipped with a backlight module that can provide backlight. Among them, in all special usage scenarios or some users' privacy needs, they do not want others to see the content on their screens, so there is an application of anti-peep screens. At present, the static anti-peeping of anti-peep screens is achieved by a grating structure arranged in parallel. At a certain angle, the transmitted light is blocked by the grating and will not be emitted, such as 3M's anti-peep film. Anti-peep films are divided into built-in anti-peeping and external anti-peeping, and the principles of the two are similar. External anti-peeping is aimed at different finished displays. The display has a relatively large light emission angle. The principle of ordinary external anti-peeping absorbs all the light at a large angle will produce shortcomings such as insufficient clarity and insufficient brightness. The built-in anti-peeping is integrated in the screen and will not affect the touch sensitivity of the screen. Although the existing traditional anti-peeping structure can achieve an anti-peeping effect at a certain angle, the overall transmittance is low, the overall darker, and the user experience is not good. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a high transmittance anti-peeping device and a preparation method thereof and an anti-peeping display device having a higher transmittance.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a high-transmittance anti-peeping device, comprising an upper substrate at a light-emitting end, a lower substrate at a light-incoming end, and an anti-peeping structure arranged between the upper substrate and the lower substrate, the anti-peeping structure comprising a plurality of light-transmitting cylinders arranged in parallel, the light-transmitting cylinder being a cylinder with one end larger than the other end, the large end of the light-transmitting cylinder being connected to the upper substrate, the small end of the light-transmitting cylinder being connected to the lower substrate, and a light-shielding gap being arranged between adjacent light-transmitting cylinders, part of the light incident on the lower substrate from the light-incoming end enters the light-transmitting cylinder and is emitted from the upper substrate within a range less than or equal to the anti-peeping angle requirement, and the rest of the light is blocked by the light-shielding gap and cannot be emitted from the upper substrate, and the side walls of the light-transmitting cylinder are arranged so that the light entering the light-transmitting cylinder can only be reflected but not transmitted.

[0005] Compared with the prior art, the advantage of the present invention is that through a specially designed structure, all the light incident into the light-transmitting column is reflected at the side wall of the light-transmitting column, while the large-angle light is not absorbed, so that all the light incident into the light-transmitting column is emitted from the upper substrate at a small angle, thereby greatly improving the transmittance while meeting the anti-peeping requirements.

[0006] Preferably, the side wall of the light-transmitting cylinder is arranged so that the light entering the light-transmitting cylinder is totally reflected by the side wall of the light-transmitting cylinder.

[0007] Preferably, extending from the lower substrate to the upper substrate, the angle between the two side walls of the light-transmitting column gradually decreases.

[0008] Preferably, the projection contour line of the side wall of the light-transmitting cylinder is a single straight line and a curve, or a plurality of straight lines and curves.

[0009] Preferably, on the lower substrate, the light-shielding gap is provided with a light-absorbing layer.

[0010] Preferably, the outer surface of the light absorbing layer is provided with a first reflective layer. This structure can reflect the light originally absorbed by the light shielding gap back when used in a display device, that is, it has a chance to enter the light-transmitting column and then be emitted from the upper substrate, which can further improve the transmittance of the entire device.

[0011] Preferably, the light-shielding gap is filled with air.

[0012] Preferably, the light-transmitting cylinder can be a circularly symmetrical cylinder or an asymmetrical cylinder. Relatively speaking, a circularly symmetrical cylinder is easier to process.

[0013] In addition, the side wall of the light-transmitting cylinder may be provided with a second reflective layer. Such a structure can prevent light incident into the light-transmitting cylinder at a large angle from being transmitted when incident on the side wall, even if the condition of total reflection is not reached.

[0014] The above-mentioned anti-peeping device can be used as an external anti-peeping film of the display device, and can also be used as a built-in anti-peeping film. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the planar structure of the anti-peeping device according to the first embodiment of the present invention;

[0016] Figure 2 This is an optical principle diagram of the anti-peeping device according to the first embodiment of the present invention;

[0017] Figure 3 Schematic diagram of the planar structure of the anti-peeping device according to the second embodiment of the present invention;

[0018] Figure 4 Schematic diagram of the three-dimensional structure of the anti-peeping device according to the second embodiment of the present invention;

[0019] Figure 5 Schematic diagram of the planar structure of the anti-peeping device according to the third embodiment of the present invention;

[0020] Figure 6 Schematic diagram of the planar structure of the anti-peeping device according to the fourth embodiment of the present invention;

[0021] Figure 7 Schematic diagram of the planar structure of the anti-peeping device according to the fifth embodiment of the present invention;

[0022] Figure 8 Schematic diagram of the planar structure of the anti-peeping device according to the sixth embodiment of the present invention;

[0023] Fig. 9 Schematic diagram of the planar structure of the anti-peeping display device according to the seventh embodiment of the present invention;

[0024] Fig.10 This is an optical principle diagram of an anti-peeping display device according to Embodiment 7 of the present invention;

[0025] Fig.11 FIG. 4 is a schematic diagram of the planar structure of an anti-peeping display device according to an eighth embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings.

[0027] Embodiment 1: Figure 1 As shown, a high-transmittance anti-peeping device 100 includes an upper substrate 11 at a light-emitting end, a lower substrate 12 at a light-incoming end, and a plurality of light-transmitting cylinders 15 arranged in parallel between the upper substrate 11 and the lower substrate 12. The light-transmitting cylinder 15 is a circularly symmetrical cylinder with one end larger than the other end. The large end of the light-transmitting cylinder 15 is connected to the upper substrate 11, and the small end of the light-transmitting cylinder 15 is connected to the lower substrate 12. A light-shielding gap 13 is arranged between adjacent light-transmitting cylinders 15. The light-shielding gap 13 is filled with air or a medium with a low refractive index. A light-absorbing layer is arranged on the lower substrate 12 corresponding to the light-shielding gap 13. 14. The side wall of the light-transmitting cylinder is divided into two sections. The angle between the two side walls of the side wall 152 close to the lower substrate 12 is α, and the angle between the two side walls of the side wall 152 close to the upper substrate 11 is β, and β<α; the above-mentioned angles α and β are set to make the light entering the light-transmitting cylinder 15 produce total reflection at the side wall of the light-transmitting cylinder 15, and part of the light incident on the lower substrate 12 from the light incident end enters the light-transmitting cylinder 15 and is emitted from the upper substrate 11 within a range less than or equal to the anti-peeping angle requirement, and the rest of the light is blocked and absorbed by the light-absorbing layer 14 of the shading gap 13 and cannot be emitted from the upper substrate 12.

[0028] The opening width of the light-transmitting column 15 on the lower substrate 12 is D1, and the width of the light-absorbing layer 14 is D2. The width of the light-shielding gap 13 of the upper substrate 11 is D3. D3 is the minimum spacing in the manufacturing process, which can be 0. The smaller D3 is, the higher the transmittance is. The width of D2 is also related to D3. According to the refractive index of the lower substrate 12 and the light-transmitting column 15, the angle range of the light entering the light-transmitting column 15 can be calculated, assuming it to be ±θ. H1 is the maximum height at which a light ray that can be emitted after one reflection can be incident. It is calculated that the angle of the light ray emitted after a deflection of 2 / α is within the required range for anti-peeping. H2+H1 is the lowest height at which light can be emitted within the anti-peeping range without being deflected. β is 2 / α, in order to allow the light incident on the side wall to have a certain deflection and ensure that the brightness is not too dispersed.

[0029] The optical principle of this embodiment is as follows Figure 2 As shown. The incident light 04 is absorbed when it enters the light absorbing layer 14 of the light-shielding gap 13. When the incident light enters the long cylinder 15 from the lower bottom edge 151 of the light-transmitting cylinder 15, there are three situations: the light 01 has a smaller angle and is incident on the upper side wall 153, deflecting to a smaller angle, while the light 02 is incident on the lower side wall 152, and after a reflection and deflection angle of 2 / α, it can be emitted and is within the scope of the anti-peeping requirements. The light 03 with a larger angle is incident on the lower side wall 152, and after reflection, it will be reflected again, and it will be emitted after being deflected again. Since the light-shielding gap 13 between the light-transmitting cylinders 15 is filled with air, the refractive index is 1. Assuming that the refractive index of the light-transmitting cylinder 15 is 1.53, and the total reflection angle with air is 40.8 degrees, the light 01, 02, and 03 incident from the bottom edge 151 can all be totally reflected and will not penetrate. The light-transmitting cylinder 15 corrects the light within the incident angle range of ±θ to a small angle, so that the angle of the emitted light is within the required range of anti-peeping. Because the large-angle light is not absorbed, the transmittance of the anti-peeping device of the present invention is higher than that of the traditional anti-peeping device.

[0030] Embodiment 2: Figure 3 and Figure 4 As shown, other structures are the same as those in the first embodiment, except that the side wall of the light-transmitting column 15 is a single linear side wall.

[0031] Embodiment 3: Figure 5 As shown, the other structures are the same as those in the first embodiment, except that the side wall of the light-transmitting cylinder 15 is an asymmetric linear straight line. If the anti-peeping requirement is asymmetric, the long cylinder 15 can also be an asymmetric structure. Light rays 09 and 010 with the same angle are reflected by side walls with different angles, and the emission angles are different.

[0032] Embodiment 4: Figure 6As shown, other structures are the same as those in the first embodiment, except that the side wall of the light-transmitting column 15 is a side wall composed of multiple linear straight lines. This structure can correct the light to be more collimated and obtain a better anti-peeping effect.

[0033] Embodiment 5: Figure 7 As shown, other structures are the same as those in the first embodiment, except that the side walls of the light-transmitting column 15 are arc-shaped side walls, which can also correct the light to be more collimated, thereby obtaining a better anti-peeping effect.

[0034] Embodiment six: Figure 8 As shown, other structures are the same as those of the above four embodiments, except that a first reflective layer 16 is provided on the outer surface of the light absorbing layer 14 .

[0035] Embodiment 7: An anti-peeping display device, which uses the anti-peeping device of the present invention as an external anti-peeping film, can be used in products or components with display functions including display panels, monitors, laptop computers, tablet computers, mobile phones, digital photo frames, navigators, etc. Fig. 9 As shown, the anti-peeping display device 001 includes a display panel 200, an anti-peeping device 100 and an optically transparent adhesive 300. The optically transparent adhesive 300 is a transparent optical adhesive such as OCA. The optically transparent adhesive 300 can also be replaced by an air layer.

[0036] Embodiment 8: An anti-peeping display device, using the anti-peeping device of the present invention as a built-in anti-peeping film, such as Fig.10 As shown, the display device 002 includes a display panel upper plate 301, an anti-peeping device 100, a display panel lower plate 302 and an optically transparent adhesive 300. The anti-peeping device 100 is located between the display panel upper plate 301 and the display panel lower plate 302, and is bonded using the optically transparent adhesive 300, which is a transparent optical adhesive such as OCA.

[0037] from Fig.11 It can be seen that when the anti-peeping device with the first reflective layer 16 added to the first embodiment is used as an external anti-peeping film, part of the light 05 that was originally absorbed can be reflected back to the display panel 200. This part of the light has a certain probability of being emitted through the light-transmitting column 15, thereby improving the transmittance of the entire device. If it is used as a built-in anti-peeping film, the reflective film carried by the lower plate 302 of the display panel and the backlight can both realize the reflection function.

[0038] In the above embodiment, in order to prevent light incident into the light-transmitting cylinder at a large angle from being transmitted when incident on the side wall even if the total reflection condition is not reached, a second reflective layer may be provided on the side wall of the light-transmitting cylinder.

[0039] This solution adopts a production method that combines Roll to Roll, UV coating and POP. Roll to Roll is a roll-to-roll process that can achieve large-scale production, and "Prism on Prism" (POP) is a processing method for making composite brightening films. The upper substrate 11 and the lower substrate 12 are transparent optical materials, which can be PET, PC, PMMA, but are not limited to them. The light-transmitting column 15 is ordinary anti-peeping white glue or other transparent colloids with optical properties. The light-shielding gap 13 can be filled with air or a transparent colloid with a low refractive index and optical properties that forms total reflection with the light entering the light-transmitting column 15. The absorption layer 14 is ordinary black glue with a high absorption rate.

Claims

1. A high-transmittance anti-peeping device, comprising an upper substrate at a light-emitting end, a lower substrate at a light-incoming end, and an anti-peeping structure arranged between the upper substrate and the lower substrate, characterized in that: The anti-peeping structure includes a plurality of light-transmitting cylinders arranged in parallel, wherein the light-transmitting cylinder is a cylinder with one end larger than the other end, the larger end of the light-transmitting cylinder is connected to the upper substrate, the smaller end of the light-transmitting cylinder is connected to the lower substrate, and a light-shielding gap is arranged between adjacent light-transmitting cylinders, part of the light incident from the light-entering end to the lower substrate enters the light-transmitting cylinder and is emitted from the upper substrate within a range less than or equal to the anti-peeping angle requirement, and the remaining part is blocked by the light-shielding gap and cannot be emitted from the upper substrate, and the side wall of the light-transmitting cylinder is arranged so that the light entering the light-transmitting cylinder can only be reflected but not transmitted by the side wall of the light-transmitting cylinder.

2. The high-transmittance anti-peeping device according to claim 1, characterized in that The side wall of the light-transmitting cylinder is arranged so that the light entering the light-transmitting cylinder is totally reflected on the side wall of the light-transmitting cylinder.

3. The high-transmittance anti-peeping device according to claim 2, characterized in that Extending from the lower substrate to the upper substrate, the angle between the two side walls of the light-transmitting column gradually decreases.

4. The high-transmittance anti-peeping device according to claim 3, characterized in that The projection contour line of the side wall of the light-transmitting cylinder is a single straight line or a single curve or a straight line with multiple line segments or a curve with multiple line segments.

5. The high-transmittance privacy protection device according to claim 1, characterized in that On the lower substrate, the light-shielding gap is provided with a light-absorbing layer.

6. The high-transmittance privacy protection device according to claim 5, characterized in that The outer surface of the light absorbing layer is provided with a first reflecting layer.

7. The high-transmittance privacy protection device according to claim 1, characterized in that The light-shielding gap is filled with air.

8. The high-transmittance privacy protection device according to claim 1, characterized in that The light-transmitting cylinder is a circularly symmetrical cylinder.

9. An anti-peeping display device, comprising an anti-peeping device and a display panel arranged on the light incident side of the anti-peeping device, characterized in that The anti-peeping device is the anti-peeping device described in any one of claims 1 to 8.

10. An anti-peeping display device, comprising an anti-peeping device, a display panel lower plate arranged on the light incident side of the anti-peeping device, and a display panel upper plate arranged on the light emitting side of the anti-peeping device, characterized in that The anti-peeping device is the anti-peeping device described in any one of claims 1 to 8.

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