Glass display screen structure with fine stripes and side wall peep-proof coating and preparation method of glass display screen structure

Abstract

The invention discloses a glass display screen structure with fine stripes and a side wall peep-proof coating and a preparation method of the glass display screen structure. The glass display screen structure comprises a glass base material, the fine stripes integrally formed on the display surface of the glass base material and the peep-proof coating selectively plated on the side walls of sunken parts of the stripes. The tiny stripes are composed of convex parts and concave parts which are alternately distributed, and the peep-proof coating is made of a high-refractive-index metal oxide. The preparation method comprises the steps of base material pretreatment, photoetching-etching or compression molding of fine stripes, directional vacuum evaporation of the side wall plating layer and post-treatment. Light rays deviating from the front view direction by more than 30 degrees are reflected or absorbed through the side wall plating layers, the visual angle is limited within + / -30 degrees, the problems that an existing attached type peep-proof film is prone to falling off and large in display loss are solved, and the peep-proof film has the advantages of being integrated, high in light transmittance, accurate in peep-proof angle and good in process compatibility; the method is suitable for portable display devices such as mobile phones and tablet computers.

Description

Technical Field

[0001] This invention relates to the field of display screen technology, specifically to a glass display screen structure with fine stripes and a privacy coating on the sidewalls, and its preparation method. Background Technology

[0002] Currently, with the widespread use of portable display devices such as smartphones and tablets, the demand for screen privacy protection is increasing. To address the issue of onlookers peeking at the screen from the side, the mainstream solution on the market is an adhesive privacy screen protector, which limits the viewing angle by setting a micro-visor structure on a thin film substrate. However, this solution has the following inherent drawbacks:

[0003] Poor structural stability: The film layer is separately attached to the screen glass, making it prone to detachment and peeling due to daily friction and bumps. Furthermore, the film layer is easily worn down after long-term use, resulting in a decrease in privacy protection. Display performance loss: The thickness of the attached film layer (usually 0.10-0.3mm) and the bonding gap lead to a 5%-12% reduction in screen transmittance, affecting color reproduction and brightness. Low process compatibility: The attached film needs to be individually cut to match different screen sizes, resulting in high adaptation costs. Summary of the Invention

[0004] To overcome the shortcomings of existing technical solutions, the present invention provides a glass display screen structure with fine stripes and a privacy coating on the sidewalls, and a method for preparing the same, which can effectively solve the problems raised in the background art.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A method for preparing a glass display screen structure with fine stripes and a privacy-protecting coating on the sidewalls includes the following steps:

[0007] Step S1: Provide a glass substrate and perform a cleaning pretreatment on the surface of the glass substrate;

[0008] Step S2: Using photolithography-etching or molding processes, continuous fine stripes are integrally formed on the display surface of the glass substrate. The fine stripes consist of alternating protrusions and depressions.

[0009] Step S3: Selectively deposit an anti-spy coating on the sidewall area of ​​the recessed portion using a directional vacuum evaporation process. The anti-spy coating is made of a high-refractive-index metal oxide.

[0010] Step S4: Perform post-processing on the coated glass substrate to obtain the upper screen glass with integrated privacy protection structure.

[0011] As a further description of the above technical solution, in step S2, the stripe spacing of the fine stripes is 20-100μm, the depression depth of the recess is 10-30μm, and the sidewall inclination angle of the recess is 30°-60°.

[0012] As a further description of the above technical solution, the photolithography-etching process in step S2 specifically includes:

[0013] Photoresist is coated onto the surface of a glass substrate, and a striped photoresist mask is formed by exposure and development through a mask.

[0014] A glass substrate is wet-etched using a hydrofluoric acid-based etching solution to form a trapezoidal cross-section recess.

[0015] Remove the photoresist mask after etching is complete.

[0016] As a further description of the above technical solution, the directional vacuum evaporation process in step S3 specifically includes:

[0017] A shielding fixture is used to cover the upper surface of the protrusion and the bottom surface of the recess, exposing only the sidewall area of ​​the recess.

[0018] The glass substrate is placed in a vacuum evaporation equipment, and titanium oxide or indium tin oxide is used as the evaporation source to deposit a privacy coating with a thickness of 50-200 nm on the side wall area.

[0019] A glass display screen structure with fine stripes and a privacy coating on the sidewalls includes:

[0020] Glass substrate, used as the upper protective substrate for display screens;

[0021] The fine stripe structure is integrally formed on the display surface of the glass substrate and consists of alternating protrusions and depressions.

[0022] An anti-spy coating is selectively deposited on the sidewall region of the recessed portion by directional vacuum evaporation.

[0023] The sidewall tilt angle of the recessed portion is configured such that light emitted from the display panel in the direct viewing direction passes directly through the fine stripes, while light deviating from the direct viewing direction is incident on the surface of the privacy coating and reflected or absorbed.

[0024] As a further description of the above technical solution, the glass substrate is aluminosilicate tempered glass with a thickness of 0.3-0.8 mm.

[0025] As a further description of the above technical solution, the spacing between the fine stripes is 20-100μm, the depth of the recess is 10-30μm, and the inclination angle of the sidewall is 30°-60°.

[0026] As a further description of the above technical solution, the cross-section of the recessed portion is trapezoidal, and the privacy coating only covers the two waist sidewall areas of the trapezoid, without covering the bottom surface of the recessed portion and the upper surface of the protrusion.

[0027] As a further description of the above technical solution, the material of the privacy coating is titanium oxide or indium tin oxide, the coating thickness is 50-200nm, and its refractive index is ≥2.0.

[0028] As a further description of the above technical solution, the optical characteristics of the privacy coating are configured as follows: specular reflection or absorption of incident light rays that deviate from the normal direction of the display surface by more than 30°, so as to limit the viewing angle of the screen to within ±30°.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] The glass display screen structure with fine stripes and a privacy coating on the sidewalls, and its preparation method, of the present invention, have at least one of the following beneficial effects during use:

[0031] 1. Enhanced Durability: The privacy structure is integrally molded with the glass substrate, eliminating the risk of adhesive layer detachment and wear, and ensuring a lifespan consistent with the screen glass. 2. Optimized Display Performance: Eliminating light transmission loss from the adhesive film layer increases screen transmittance by 8%-15%, resulting in color reproduction and brightness closer to the original screen effect. 3. Strong Privacy Stability: The structural parameters of the fine stripes and sidewall coating are consistent, ensuring a privacy angle (visible within ±30° when viewed directly) consistency error of ≤5°. 4. High Process Adaptability: Compatible with existing screen glass photolithography, etching, and vacuum plating processes, enabling mass production and adaptability to display devices of different sizes. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the fine stripe structure on the upper glass surface and the privacy coating on the sidewall of a glass display screen structure with fine stripes and a privacy coating on the sidewall, according to the present invention.

[0033] Figure 2 This is a flowchart illustrating the preparation method of a glass display screen structure with fine stripes and a privacy coating on the sidewalls, according to the present invention.

[0034] Numbering on the map:

[0035] 1. Recessed area; 2. Raised area; 3. Privacy protection coating. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figure 1-2 As shown, the present invention provides a method for preparing a glass display screen structure with fine stripes and a sidewall privacy coating 3, characterized by comprising the following steps:

[0038] Step S1: Provide a glass substrate and perform a cleaning pretreatment on the surface of the glass substrate;

[0039] Aluminosilicate tempered glass with a thickness of 0.5mm was selected as the upper glass substrate, with a substrate thickness of 0.3-0.8mm. Its surface was ultrasonically cleaned and dried to ensure it was free of impurities.

[0040] Step S2: Through photolithography-etching or molding processes, continuous fine stripes are integrally formed on the display surface of the glass substrate. The fine stripes are composed of alternating protrusions 2 and recesses 1.

[0041] When light emitted from the display panel enters the upper glass, the geometry of the fine stripes (recess depth 10-30μm, sidewall tilt angle 30°-60°) acts as a light direction filter. Light propagating approximately perpendicular to the glass surface can pass directly through the gaps in the protrusions 2 and the openings in the recesses 1, penetrating the glass unimpeded to reach the human eye, ensuring image clarity and brightness at normal viewing angles. Light propagating at a smaller angle to the glass surface will inevitably impact the sidewall area of ​​the recesses 1. This structural design ensures that non-directly viewed light cannot "bypass" the sidewalls, creating conditions for subsequent privacy protection.

[0042] Step S3: Using a directional vacuum evaporation process, a privacy shielding layer 3 is selectively deposited on the sidewall region of the recess 1. The privacy shielding layer 3 is made of a high refractive index metal oxide.

[0043] A high-refractive-index metal oxide coating (such as TiO2 or ITO) deposited only on the sidewall of the recess 1 using a directional vacuum evaporation process serves as the "actuator" for achieving the privacy protection function. The refractive index of this coating is ≥2.0, significantly higher than that of the glass substrate (refractive index approximately 1.5). When light travels from the optically dense medium (glass) to the optically dense medium (coating), strong specular reflection occurs at the interface.

[0044] When light incident at a large angle hits the sidewall coating, it is reflected back into the display panel and cannot escape the glass surface to reach the viewer's eyes. The metal oxide material itself has absorption properties for specific wavelengths of light, which can further dissipate the residual transmitted light energy.

[0045] The tilt angle (30°-60°) of the sidewall of the recess 1 is designed through optical path simulation. This ensures that light rays outside the "critical angle" (i.e., 30° viewing angle) can hit the coating surface at a large incident angle, thereby triggering strong reflection; while direct light rays, due to their small incident angle, hardly interact with the coating and pass directly through.

[0046] Step S4: Perform post-processing on the coated glass substrate to obtain the upper screen glass with integrated privacy protection structure.

[0047] This embodiment utilizes a photomask to precisely replicate fine stripe patterns. Through the isotropic or anisotropic properties of wet etching, trapezoidal grooves with specific angles are etched onto the glass surface. The etching solution ratio (e.g., HF:HNO3:H2O) and etching time directly determine the tilt angle and depth of the sidewalls, forming the technological basis for optical design. Using the principle of vacuum evaporation, metal oxides are vaporized and deposited linearly onto the substrate. With the aid of a masking fixture (physical mask), the height difference of the protrusion 2 structure itself enables selective coverage of the sidewalls only. This is a self-aligned or assisted-aligned micromachining technique that avoids the complex subsequent process of removing the coating from the surface of the protrusion 2.

[0048] The privacy screen structure in this embodiment is integrally molded with the glass substrate, eliminating the risk of adhesive layer detachment and wear, and ensuring a lifespan consistent with the screen glass. Eliminating light transmission loss from the adhesive film layer increases screen transmittance by 8%-15%, resulting in color reproduction and brightness closer to the original screen. The structural parameters of the fine stripes and sidewall coating are consistent, ensuring a privacy angle (visible within ±30° from the front view) consistency error of ≤5°. It is compatible with existing screen glass photolithography, etching, and vacuum plating processes, enabling mass production and adaptation to display devices of different sizes.

[0049] Furthermore, in step S2, the spacing between the fine stripes is 20-100 μm, the depth of the recess 1 is 10-30 μm, and the inclination angle of the sidewall of the recess 1 is 30°-60°.

[0050] Viewing angle (0° ± 30° off the normal direction of the display surface): Light travels in a direction approximately perpendicular to the glass surface and can pass directly through the gaps between the protrusions 2 and the space between the recesses 1 of the fine stripes, reaching the human eye without obstruction and achieving clear visibility.

[0051] Non-viewing angle (deviation from the normal direction > 30°): The direction of light propagation is at a small angle to the side wall of the recess 1, and it will directly illuminate the surface of the privacy coating 3 on the side wall of the recess 1. Since the coating is made of a high refractive index metal oxide material (refractive index n ≥ 2.0), its optical properties cause the incident light to undergo specular reflection (the reflection direction points to the inside of the display panel) or be absorbed by the coating material, and cannot propagate to the non-viewing area outside the glass, thereby blocking the transmission of light from unauthorized viewing angles and realizing the privacy function.

[0052] Meanwhile, the spacing of the fine stripes (20-100μm) matches the pixel spacing of the display device, avoiding grid-like interference on the display screen; the tilt angle (30°-60°) of the side wall of the recessed part 1 is an optical design based on the angle of light incidence, ensuring that light from non-direct viewing angles is accurately incident on the coating area, while light from direct viewing angles avoids the coating, thus balancing privacy protection and display clarity.

[0053] To further clarify, the photolithography-etching process described in step S2 specifically includes:

[0054] Photoresist is coated onto the surface of a glass substrate, and a striped photoresist mask is formed by exposure and development through a mask.

[0055] A glass substrate was wet-etched using a hydrofluoric acid-based etching solution to form a trapezoidal cross-section recess 1;

[0056] Remove the photoresist mask after etching is complete.

[0057] Positive photoresist was spin-coated onto the surface of a glass substrate at a spin speed of 3000 r / min, resulting in a film thickness of 1.5 μm. A fine stripe mask (50 μm period, 45° inclination angle of the trapezoidal waist of the recessed part) was exposed using an ultraviolet lithography machine (wavelength 365 nm) for 20 s. After development with a developer, a stripe-shaped photoresist mask was obtained.

[0058] The glass was wet etched using a hydrofluoric acid mixed etching solution (HF:HNO3:H2O=1:3:6) at an etching temperature of 25℃ and an etching time of 80s, forming trapezoidal fine stripes with a depth of 20μm. After etching, the photoresist mask was removed, and the glass was cleaned and dried.

[0059] To further clarify, the directional vacuum evaporation process described in step S3 specifically includes:

[0060] A shielding fixture is used to cover the upper surface of the protrusion 2 and the bottom surface of the recess 1, exposing only the side wall area of ​​the recess 1;

[0061] The glass substrate is placed in a vacuum evaporation equipment, and titanium oxide or indium tin oxide is used as the evaporation source to deposit a privacy coating with a thickness of 50-200 nm on the side wall area.

[0062] Fabrication of the shielding fixture: A high-temperature resistant PET film is used to cover the bottom surface of the protrusions 2 and the recesses 1 on the glass surface, exposing only the sidewall area of ​​the recesses 1. Directional vacuum evaporation: The glass is placed in a vacuum evaporation apparatus, and the vacuum level is evaporated to 5×10⁻⁻⁻⁶. 4 Pa, using titanium oxide as the evaporation source, with an evaporation rate of 0.1 nm / s, deposited a privacy coating 3 with a thickness of 100 nm; after evaporation, remove the shielding fixture.

[0063] Finally, the glass surface is plasma polished (200W power, 30s) to remove residual impurities, resulting in the upper screen glass with an integrated privacy protection structure.

[0064] A glass display screen structure with fine stripes and a privacy coating 3 on the sidewalls includes:

[0065] Glass substrate, used as the upper protective substrate for display screens;

[0066] The fine stripe structure is integrally formed on the display surface of the glass substrate and consists of alternating protrusions 2 and recesses 1.

[0067] The privacy coating 3 is selectively deposited on the side wall area of ​​the recessed portion 1 by directional vacuum evaporation.

[0068] The sidewall tilt angle of the recessed portion 1 is configured such that light emitted from the display panel in the direct viewing direction passes directly through the fine stripes, while light deviating from the direct viewing direction is incident on the surface of the privacy coating 3 and is reflected or absorbed.

[0069] In this embodiment, the direction of light rays viewed directly (0°±30°) is approximately perpendicular to the glass surface, propagating in a straight line along the opening area of ​​the recess 1 or the gap of the protrusion 2, without contacting or minimally contacting the sidewall area, and directly penetrating the glass to reach the user's eyes. Large-angle light rays (>30°) propagate at a smaller angle to the glass surface, constrained by the geometry of the recess 1, and inevitably incident on the sidewall area of ​​the recess 1. When large-angle light rays irradiate the privacy coating 3 on the sidewall area, due to the high refractive index characteristics of the coating (n≥2.0), the light undergoes specular reflection at the glass-coating interface or is absorbed by the coating material, preventing it from passing through the glass surface, thus blocking the propagation of light from non-viewing angles. By directly integrating the privacy function into the upper glass body of the screen, without the need for additional film layers, structural integration is achieved.

[0070] It should be further noted that the glass substrate is aluminosilicate tempered glass with a thickness of 0.3-0.8 mm.

[0071] Compared to soda-lime glass, aluminosilicate glass has higher mechanical strength and scratch resistance; after chemical tempering, the surface compressive stress layer is deeper, significantly improving impact resistance and bending resistance.

[0072] Furthermore, the spacing between the fine stripes is 20-100 μm, the depth of the recess 1 is 10-30 μm, and the inclination angle of the sidewall is 30°-60°.

[0073] Ensure that incident light rays outside 30° of the normal can strike the sidewall coating at a large angle (close to grazing) to induce strong reflection; while direct light rays pass through at a steep angle and do not come into contact with the coating.

[0074] Furthermore, the recessed portion 1 has a trapezoidal cross-section, and the privacy coating 3 only covers the two sidewall areas of the trapezoid, without covering the bottom surface of the recessed portion 1 or the upper surface of the protrusion 2.

[0075] The bottom surface of the recessed part 1 is uncoated, allowing some light at a small angle to pass through from the bottom; the upper surface of the raised part 2 is uncoated, ensuring the light transmittance from the front.

[0076] Furthermore, the privacy coating 3 is made of titanium oxide or indium tin oxide, with a coating thickness of 50-200 nm and a refractive index ≥2.0.

[0077] High refractive index materials ensure that light deviating from the viewing angle is efficiently reflected or absorbed, resulting in a significant privacy protection effect. A thickness of 50-200nm is easily and precisely controlled through vacuum evaporation, and it adheres firmly to the glass substrate.

[0078] Furthermore, the optical properties of the privacy coating 3 are configured such that incident light rays deviating from the normal direction of the display surface by more than 30° are specularly reflected or absorbed, thereby limiting the viewing angle of the screen to within ±30°.

[0079] It achieves a quantifiable privacy standard, meaning that the content can only be seen within an approximately 60° angle directly in front of the screen, while onlookers on either side see a black screen or a blurry image.

[0080] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for preparing a glass display screen structure with fine stripes and a privacy coating on the sidewalls, characterized in that, Includes the following steps: Step S1: Provide a glass substrate and perform a cleaning pretreatment on the surface of the glass substrate; Step S2: Using photolithography-etching or molding processes, continuous fine stripes are integrally formed on the display surface of the glass substrate. The fine stripes consist of alternating protrusions and depressions. Step S3: Selectively deposit an anti-spy coating on the sidewall area of ​​the recessed portion using a directional vacuum evaporation process. The anti-spy coating is made of a high-refractive-index metal oxide. Step S4: Perform post-processing on the coated glass substrate to obtain the upper screen glass with integrated privacy protection structure.

2. The preparation method according to claim 1, characterized in that, In step S2, the spacing between the fine stripes is 20-100 μm, the depth of the recess is 10-30 μm, and the inclination angle of the sidewall of the recess is 30°-60°.

3. The preparation method according to claim 1, characterized in that, The photolithography-etching process described in step S2 specifically includes: Photoresist is coated onto the surface of a glass substrate, and a striped photoresist mask is formed by exposure and development through a mask. A glass substrate is wet-etched using a hydrofluoric acid-based etching solution to form a trapezoidal cross-section recess. Remove the photoresist mask after etching is complete.

4. The preparation method according to claim 1, characterized in that, The directional vacuum evaporation process described in step S3 specifically includes: A shielding fixture is used to cover the upper surface of the protrusion and the bottom surface of the recess, exposing only the sidewall area of ​​the recess. The glass substrate is placed in a vacuum evaporation equipment, and titanium oxide or indium tin oxide is used as the evaporation source to deposit a privacy coating with a thickness of 50-200 nm on the side wall area.

5. A glass display screen structure with fine stripes and a privacy coating on the sidewalls, characterized in that, Prepared by the preparation method according to any one of claims 1 to 4, comprising: Glass substrate, used as the upper protective substrate for display screens; The fine stripe structure is integrally formed on the display surface of the glass substrate and consists of alternating protrusions and depressions. An anti-spy coating is selectively deposited on the sidewall region of the recessed portion by directional vacuum evaporation. The sidewall tilt angle of the recessed portion is configured such that light emitted from the display panel in the direct viewing direction passes directly through the fine stripes, while light deviating from the direct viewing direction is incident on the surface of the privacy coating and reflected or absorbed.

6. The glass display screen structure according to claim 5, characterized in that, The glass substrate is aluminosilicate tempered glass with a thickness of 0.3-0.8 mm.

7. The glass display screen structure according to claim 5, characterized in that, The spacing between the fine stripes is 20-100 μm, the depth of the recess is 10-30 μm, and the inclination angle of the sidewall is 30°-60°.

8. The glass display screen structure according to claim 5, characterized in that, The recessed portion has a trapezoidal cross-section, and the privacy coating only covers the two sidewall areas of the trapezoid, without covering the bottom surface of the recessed portion or the upper surface of the protrusion.

9. The glass display screen structure according to claim 5, characterized in that, The privacy shield coating is made of titanium oxide or indium tin oxide, with a coating thickness of 50-200 nm and a refractive index ≥2.

0.

10. The glass display screen structure according to claim 5, characterized in that, The optical properties of the privacy coating are configured such that incident light rays deviating from the normal direction of the display surface by more than 30° are specularly reflected or absorbed, thereby limiting the viewing angle of the screen to within ±30°.

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