Controllable peep-proof device and peep-proof display device

Abstract

The utility model discloses a controllable peep-proof device which comprises a lower transparent substrate and an upper transparent substrate, a transparent electrode which is integrally connected is arranged between the lower transparent substrate and the upper transparent substrate, the transparent electrode comprises a plurality of peep-proof units which are arranged in parallel, and each peep-proof unit is composed of a plane light emitting part and a peep-proof groove. The lower surface of the plane light emitting part is attached to the lower transparent substrate, an opening of the peep-proof groove faces the lower transparent substrate, the peep-proof groove is filled with electrophoresis liquid, the electrophoresis liquid contains light absorption particles with negative electricity, and a transparent insulator is arranged between the upper transparent substrate and the transparent electrode. The anti-peeping display device has the advantages that the anti-peeping state and the sharing state can be switched by using the electrophoresis liquid containing light absorption particles with negative electricity and adopting a simple layer of transparent electrode to enable the charged particles to adsorb the transparent electrode, redundant electrodes and power sources are not used, and the anti-peeping display device is simple in structure, convenient to operate and low in cost. The structure is simple and the preparation cost is low.

Description

Technical Field

[0001] The present invention relates to an anti-peeping device, and in particular to a controllable anti-peeping device 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 becoming more and more closely related to people's lives. Since a liquid crystal display cannot emit light by itself, a backlight module that can provide backlight needs to be configured. Among them, in some special usage scenarios or for the privacy needs of some users, it is not desired that others can see the content on their screens, so the application of anti-peeping screens has emerged. At present, the static anti-peeping of anti-peeping screens is achieved through a grating structure arranged in parallel. At a certain angle, the transmitted light is blocked by the grating and will not exit, such as the anti-peeping film of 3M. There is also a dynamic anti-peeping, that is, the switching between the shared state and the anti-peeping state can be realized. For example, a 3M anti-peeping film is mounted in a common backlight module, and a PDLC, a smectic phase dimming film, etc. are mounted between the 3M anti-peeping film and the display screen. The dimming film is used to switch between the fully transparent state and the scattering state to switch between the privacy state and the shared state. The problems of this solution are that the 3M anti-peeping film is relatively expensive, and the viewing angle difference of the PDLC in the fully transparent state will affect the effect of the privacy state; the driving voltage of the smectic phase dimming film is high and the response speed at low temperature is too slow. And due to the addition of liquid crystal, the cell thickness is significantly increased, which is not conducive to thinning. CN109709738A discloses a controllable anti-peeping device that uses a transparent electrode to attract and repel reflective particles to control the switching between the shared state and the anti-peeping state, but the disadvantage of this solution is that it requires multiple uses of the lithography process, the manufacturing cost is relatively high, and the structure is relatively complex. It not only requires the fabrication of two corresponding electrodes, but also requires an additional power supply. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a controllable anti-peeping device and an anti-peeping display device with a simple structure and good anti-peeping effect.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows: A controllable anti-peeping device includes a lower transparent substrate and an upper transparent substrate. A transparent electrode integrally connected is disposed between the lower transparent substrate and the upper transparent substrate. The transparent electrode includes a plurality of anti-peeping units arranged in parallel. Each anti-peeping unit is composed of a planar light-emitting portion and an anti-peeping groove. The lower surface of the planar light-emitting portion is adhered to the lower transparent substrate. The anti-peeping groove opens towards the lower transparent substrate. The anti-peeping groove is filled with electrophoresis liquid, and the electrophoresis liquid contains negatively charged light-absorbing particles. A transparent insulator is disposed between the upper transparent substrate and the transparent electrode. An electric field control line connected to the display substrate is disposed on the transparent electrode to form a vertical electric field.

[0005] Compared with the prior art, the advantages of the present invention are that by using an electrophoresis solution containing negatively charged light-absorbing particles, a simple single-layer transparent electrode can be used to adsorb charged particles to the transparent electrode to switch between the anti-peeping state and the sharing state, without using redundant electrodes and power sources, and the structure is simple and the cost is low.

[0006] The preparation method of the controllable anti-peeping device of the present invention includes the following steps:

[0007] Step 1: A mold corresponding to the anti-peeping groove is arranged on the upper transparent substrate, and a transparent insulator with a groove corresponding to the cross-sectional shape of the anti-peeping groove is made on the inner surface of the upper transparent substrate;

[0008] Step 2: A layer of transparent electrode is coated on the surface of the transparent insulator to form a flat light-emitting part and an anti-peeping groove;

[0009] Step 3: Fill the anti-peeping groove with an electrophoresis solution containing negatively charged light-absorbing particles;

[0010] Step 4: Cover the lower transparent substrate on the transparent electrode so that the lower surface of the flat light-emitting part is attached to the lower transparent substrate;

[0011] Step 5: Set an electric field control line on the transparent electrode and lead it out for connection with the display substrate.

[0012] The method of the present invention has a simple process, does not require the use of a lithography process, has a low manufacturing cost, and is suitable for large-area roll-to-roll process manufacturing.

[0013] For the anti-peeping display device using the above controllable anti-peeping device, the controllable anti-peeping device can be made into an in-built type and arranged between the backlight module and the display panel, and the electric field control line is electrically connected to the display panel.

[0014] Preferably, a reflective layer can be plated on the inner surface of the lower transparent substrate at a position corresponding to the opening of the anti-peeping groove, and the width of the reflective layer is less than or equal to the width of the opening of the anti-peeping groove. This structure can reflect the light that was originally incident into the electrophoresis solution and absorbed by the negatively charged light-absorbing particles back to the backlight module and then reflected back, so that there is a chance to be emitted, improving the transmittance of the entire device. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the controllable anti-peeping device according to Embodiment 1 of the present invention;

[0016] Figure 2 It is an optical path diagram of the anti-peeping state of the controllable anti-peeping device according to Embodiment 1 of the present invention;

[0017] Figure 3 It is an optical path diagram of the sharing state of the controllable anti-peeping device according to Embodiment 1 of the present invention;

[0018] Figure 4 Schematic diagram corresponding to the completion of Step 1 of the preparation method of the present invention;

[0019] Figure 5 Schematic diagram corresponding to the completion of Step 2 of the preparation method of the present invention;

[0020] Figure 6 Schematic diagram corresponding to the completion of Step 3 of the preparation method of the present invention;

[0021] Figure 7 Schematic diagram corresponding to the completion of Step 4 of the preparation method of the present invention;

[0022] Figure 8 Schematic diagram of the anti-peeping display device of Embodiment 2 of the present invention;

[0023] Figure 9 Optical path diagram of the anti-peeping state of the anti-peeping display device of Embodiment 2 of the present invention;

[0024] Figure 10 Schematic diagram of the controllable anti-peeping device of Embodiment 3 of the present invention;

[0025] Figure 11 Schematic diagram of the controllable anti-peeping device of Embodiment 4 of the present invention. Detailed implementation manners

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] Embodiment 1: As Figures 1 to 3 shown, a controllable anti-peeping device 100 includes a lower transparent substrate 12 and an upper transparent substrate 11. A transparent electrode 13 connected integrally is disposed between the lower transparent substrate 12 and the upper transparent substrate 11. The transparent electrode 13 includes a plurality of anti-peeping units 131 arranged in parallel. Each anti-peeping unit 131 is composed of a planar light-emitting portion 1311 and an anti-peeping groove 1312 in a trapezoidal shape. The lower surface of the planar light-emitting portion 1311 is adhered to the lower transparent substrate 12. The opening of the anti-peeping groove 1312 is trapezoidal with the long side facing the lower transparent substrate 12 and the short side away from the lower transparent substrate 12. The anti-peeping groove 1312 is filled with an electrophoresis solution 14, and the electrophoresis solution 14 contains light-absorbing particles 141 with negative charges. A transparent insulator 15 is disposed between the upper transparent substrate 11 and the transparent electrode 13. The transparent electrode 13 and the lower transparent substrate 12 enclose the electrophoresis solution 14 between the transparent electrode 13 and the lower transparent substrate 12. An electric field control line 132 is disposed on the transparent electrode 13 and is connected to the display substrate 200 to form a vertical electric field.

[0028] As Figure 1As shown, the width D of the planar light-emitting portion 1311 and the opening width W of the anti-peeping groove 1312 satisfy the following condition: D / W = tanα, where α is the anti-peeping angle required by the design.

[0029] The specific working principle of this embodiment is as follows: In the initial state, the light-absorbing particles 141 in the electrophoresis liquid 14 are in a disordered state. When the anti-peeping state is normally used, the electric field between the transparent electrode 13 and the display substrate 200 is adjusted to be positive pressure on the transparent electrode 13, and the light-absorbing particles 141 in the electrophoresis liquid 14 are adsorbed on the inner side wall of the trapezoidal anti-peeping groove 1312 of the anti-peeping unit 131. Then, the anti-peeping groove 1312 is no longer light-transmissive, and the side wall of the trapezoidal anti-peeping groove 1312 has a full-absorption characteristic, and the light incident on the side wall 13121 of the anti-peeping groove 1312 will be absorbed. As Figure 2 shown, the light rays 01 and 02 that do not enter the electrophoresis liquid 14 pass through the lower transparent substrate 12 and the planar light-emitting portion 1311 of the anti-peeping unit 131 and enter the transparent insulator 15. If the light ray angle is small, it directly passes through the transparent insulator 15 and the upper transparent substrate 11 and exits. If the angle is large, it is incident on the side wall 13121 of the anti-peeping groove 1312. Since the side wall 13121 adsorbs the light-absorbing particles 141, total absorption will occur, and the controllable anti-peeping device 100 presents an anti-peeping state.

[0030] As Figure 3 shown, the electric field between the transparent electrode 13 and the display substrate 200 is adjusted to be negative pressure on the transparent electrode 13, and the light-absorbing particles 141 in the electrophoresis liquid 14 are pushed away from the transparent electrode and no longer adsorbed on the inner side wall. At this time, the light rays 01 and 02 pass through the lower transparent substrate 12 and the planar light-emitting portion 1311 of the anti-peeping unit 131 and enter the transparent insulator 15. If the light ray angle is small, it directly passes through the transparent insulator 15 and the upper transparent substrate 11 and exits. If the angle is large, the light rays 03 and 04 are incident on the side wall 13121 of the anti-peeping groove 1312. Since the side wall 13121 does not adsorb the light-absorbing particles 141, the light rays 03 and 04 have a certain probability of penetrating the anti-peeping groove 1312 and the electrophoresis liquid 14, passing through the transparent insulator 15 and the upper transparent substrate 11 and exiting. The controllable anti-peeping device 100 presents a sharing state, and the transmittance is higher than that of ordinary anti-peeping devices.

[0031] The specific process flow of the preparation method of the controllable anti-peeping device 100 in this embodiment is as follows: The lower transparent substrate 12 and the upper transparent substrate 11 are transparent optical materials, which can be PET, PC, PMMA, but are not limited thereto. The transparent insulator 15 can be deionized water, silica gel, UV glue and other electrically insulating liquids or colloids with optical properties, but is not limited thereto. The electrophoresis solution 14 is an electrolyte similar to that in electronic ink, and its function is to provide a medium for charged particles to move freely. The light-absorbing particles 141 are microspheres made of pigments or fuels and resins, and carry negative charges. The transparent electrode 13 is a transparent conductive material such as ITO.

[0032] First, a corresponding mold is arranged on the upper transparent substrate 11 to make the transparent insulator 15 with a trapezoidal groove structure, as Figure 4 shown; on this basis, a layer of transparent electrode 13 is coated, as Figure 5 shown; then, the electrophoresis solution 14 containing negatively charged light-absorbing particles 141 is filled in the trapezoidal groove, as Figure 6 shown; then the lower transparent substrate 12 is covered to protect the electrophoresis solution 14 and the transparent electrode 13, as Figure 7 shown; finally, an electric field control line 132 is arranged and led out on the transparent electrode 13.

[0033] The controllable anti-peeping device 100 in this embodiment is an internal anti-peeping film, which can be included in products or components with display functions such as display panels, monitors, laptop computers, tablet computers, mobile phones, digital photo frames, and navigators.

[0034] Embodiment 2: As Figure 8 shown, the display device 400 includes a backlight module 300, the controllable anti-peeping device 100 of Embodiment 1, and a display panel 200. The controllable anti-peeping device 100 is arranged between the backlight module 300 and the display panel 200 and can be adhered by an optically transparent adhesive.

[0035] As Figure 9 shown, in this embodiment, a reflective layer 16 is plated at a position corresponding to the long bottom side of the trapezoid on the lower transparent substrate 12, and the width of the reflective layer 16 is less than or equal to the width of the opening of the anti-peeping groove 1312. When the controllable anti-peeping device 100 presents an anti-peeping state, the light 06 that was originally incident into the electrophoresis solution 14 and absorbed by the light-absorbing particles 141 can be reflected back to the backlight module 300 and then reflected back, so there is a chance to exit, improving the transmittance of the entire device.

[0036] Embodiment 3: As Figure 10 shown, other structures and features of the controllable anti-peeping device 100 are the same as those in Embodiment 1 or Embodiment 2, except that the two side edges of the isosceles trapezoid are arcs recessed towards the inside of the anti-peeping groove 1312.

[0037] Embodiment 4: AsFigure 11 As shown, the other structures and features of the controllable anti-peeping device 100 are the same as those in the first embodiment or the second embodiment, except that the cross-sectional shape of the anti-peeping groove 1312 is replaced from an isosceles trapezoid to an isosceles triangle with the opening as the base.

[0038] The description of the cross-sectional shape of the anti-peeping groove 1312 in the above embodiments is only some examples. The cross-sectional shape of the anti-peeping groove 1312 of the present invention is not limited to the above embodiments. For example, the isosceles trapezoid can also be a non-isosceles trapezoid, the equilateral triangle can also be a non-equilateral triangle, and the cross-sectional shape of the anti-peeping groove 1312 can also be other geometric shapes.

Claims

1. A controllable anti-peeping device, comprising a lower transparent substrate and an upper transparent substrate. A transparent electrode integrally connected is arranged between the lower transparent substrate and the upper transparent substrate. The transparent electrode includes a plurality of anti-peeping units arranged in parallel. It is characterized in that, The anti-peeping unit consists of a planar light-emitting part and an anti-peeping groove. The lower surface of the planar light-emitting part is adhered to the lower transparent substrate. The anti-peeping groove opens towards the lower transparent substrate. The anti-peeping groove is filled with an electrophoretic solution containing light-absorbing particles with negative charges. A transparent insulator is provided between the upper transparent substrate and the transparent electrode. An electric field control line is provided on the transparent electrode and is connected to the display substrate to form a vertical electric field.

2. The controllable anti-peeping device according to claim 1, characterized in that, The width of the planar light-emitting part and the opening width of the anti-peeping groove satisfy the following condition: width of planar light-emitting part / opening width of anti-peeping groove = tan(anti-peeping angle).

3. The controllable anti-peeping device according to claim 1 or 2, characterized in that, The cross-sectional shape of the anti-peeping groove is an isosceles trapezoid with the opening of the anti-peeping groove as the lower base.

4. The controllable anti-peeping device according to claim 3, wherein The two side edges of the isosceles trapezoid are arcs that are concave towards the inside of the anti-peeping groove.

5. A controllable anti-peeping device according to claim 1 or 2, characterized in that, The cross-sectional shape of the anti-peeping groove is an isosceles triangle with the opening of the anti-peeping groove as the base.

6. An anti-peeping display device, comprising a backlight module, a display panel, and an anti-peeping device disposed between the backlight module and the display panel, characterized in that, The anti-peeping device is the controllable anti-peeping device described in any one of claims 1 to 5, and the electric field control line is electrically connected to the display panel.

7. The anti-peeping display device according to claim 6, wherein, A reflective layer is plated on the inner surface of the lower transparent substrate corresponding to the position of the opening of the anti-peeping groove, and the width of the reflective layer is less than or equal to the opening width of the anti-peeping groove.

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