Light leakage prevention display screen and preparation method thereof

Abstract

The invention discloses a light leakage prevention display screen and a preparation method thereof, and belongs to the technical field of display equipment. The light leakage prevention display screen comprises a handwriting film, a glass panel and a sensor which are sequentially stacked. The ink layers are arranged on the edge circle of the front face, the edge circle of the back face and the side face of the glass panel, the handwriting film is bonded to the front face of the glass panel, and the sensor is bonded to the back face of the glass panel. The ink layers are arranged on the front edge circle, the back edge circle and the side face of the glass panel, light of the backlight module can be prevented from penetrating through the upper face and the side face of the glass panel to form scattering, therefore, light leakage of the side face of the display screen is avoided, and the display effect and the use experience of the display screen are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of display equipment, and in particular relates to a light leakage prevention display screen and a preparation method thereof. Background Art

[0002] A display screen is a device or appliance used to display images and colors. It is widely used in mobile phones, computers, monitors, televisions and other devices with image or text display functions. Display screen light leakage refers to the phenomenon of uneven brightness or visible light at the edges or certain areas of the screen when the screen displays a black or dark background. This light leakage phenomenon affects the display effect of the display screen and the user's visual experience.

[0003] In the prior art, ink is usually printed on the back of a glass panel. However, since the glass panel has a certain thickness, the light from the backlight module will pass through the top and sides of the glass panel to scatter, causing light leakage on the display screen. In addition, since the ink has insufficient light-shielding properties, it is often necessary to print multiple times, which is inefficient. Summary of the invention

[0004] In view of the above situation, in order to overcome at least part of the defects of the above prior art, the present invention provides a light leakage prevention display screen and a preparation method thereof.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: The present invention provides a light leakage prevention display screen, comprising: a handwriting film, a glass panel and a sensor which are stacked in sequence, wherein an ink layer is arranged around a front edge, a back edge and a side of the glass panel, the handwriting film is adhered to the front side of the glass panel, and the sensor is adhered to the back side of the glass panel.

[0006] In some embodiments, the ink layer has a thickness of 5 μm to 10 μm.

[0007] In some embodiments, the ink layer is made by printing onto a glass panel using black ink.

[0008] In some embodiments, the black ink includes the following components by weight: 20-30 parts of epoxy acrylate, 20-30 parts of pentaerythritol triacrylate, 3-6 parts of initiator, 5-8 parts of carbon black, and 4-6 parts of palmitic acid-modified barium carbonate.

[0009] In some embodiments, the palmitic acid-modified barium carbonate is prepared by wet surface modification of sodium palmitate and nano-barium carbonate.

[0010] In some embodiments, the initiator is any one or a combination of p-dimethylaminobenzoic acid isooctyl ester, trimethylbenzoyl-diphenylphosphine oxide and 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0011] The present invention also provides a method for preparing a light leakage-proof display screen, comprising: Black ink is printed around the front edge, back edge and side of the glass panel and cured at room temperature. The handwriting film is bonded to the front of the glass panel using optical glue, and the sensor is bonded to the back of the glass panel using optical glue to obtain a light leakage-proof display screen.

[0012] In some embodiments, the method for preparing the black ink comprises: Take epoxy acrylate and pentaerythritol triacrylate, mix them evenly, add palmitic acid-modified barium carbonate, initiator and carbon black, grind for 1h-2h, and obtain black ink.

[0013] In some embodiments, the method for preparing the palmitic acid-modified barium carbonate comprises: Take nano-barium sulfate and add it into water to prepare nano-barium sulfate suspension, raise the temperature to 60-80°C, add sodium palmitate, emulsify at high speed at 3000-4000rpm for 20min-30min, wash with water, filter and dry to obtain palmitic acid modified barium carbonate.

[0014] In some embodiments, the mass ratio of the nano barium sulfate to sodium palmitate is 1:0.2-0.5.

[0015] The beneficial effects achieved by the present invention are as follows: By setting an ink layer around the front edge, back edge and sides of the glass panel, it is possible to prevent the light from the backlight module from passing through the top and sides of the glass panel and scattering, thereby preventing light leakage from the sides of the display screen and improving the display effect and user experience of the display screen.

[0016] Adding palmitic acid-modified barium carbonate to the ink can improve the light-shielding effect of the ink, and at the same time improve the fluidity of the ink, so that the carbon black is evenly dispersed in the ink, thereby improving the light-shielding property of the ink layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a light leakage prevention display screen according to an embodiment of the present invention.

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0021] In view of the deficiencies in the prior art mentioned in the background technology, refer to Figure 1 A first aspect of an embodiment of the present invention provides an anti-light leakage display screen, comprising: a handwriting film, a glass panel and a sensor stacked in sequence, an ink layer is arranged around the front edge, a back edge and a side of the glass panel, the handwriting film is bonded to the front side of the glass panel, and the sensor is bonded to the back side of the glass panel.

[0022] The handwriting film is in direct contact with the user, and its main function is to allow the user to perform handwriting or touch input while maintaining the clarity and sensitivity of the display. The glass panel is made of high-transmittance material to reduce the loss of light during transmission and improve display clarity and brightness. The sensor can detect the user's touch and convert it into digital signals for further processing. These signals can be transmitted to the device's processor to perform corresponding operations.

[0023] By setting an ink layer around the front edge, back edge and sides of the glass panel, it is possible to prevent the light from the backlight module from passing through the top and sides of the glass panel and scattering, thereby preventing light leakage from the sides of the display screen and improving the display effect and user experience of the display screen.

[0024] In some embodiments, the thickness of the ink layer is 5 μm-10 μm. Since the thicker the ink layer is, the better the light shielding effect of the ink layer is, and the ink layer is less likely to solidify, on the other hand, the thinner the ink layer is, the worse the light shielding effect of the ink layer is, and the easier the ink layer is to solidify, by setting the thickness of the ink layer to 5 μm-10 μm, the ink layer can have a better light shielding effect and a shorter solidification time.

[0025] In some embodiments, the ink layer is made of black ink by printing on the glass panel. The black ink can be more accurately covered on the glass panel by printing, so as to avoid the black ink affecting the display effect of the display screen.

[0026] In some embodiments, the black ink includes the following components by weight: 20-30 parts of epoxy acrylate, 20-30 parts of pentaerythritol triacrylate, 3-6 parts of initiator, 5-8 parts of carbon black, and 4-6 parts of palmitic acid-modified barium carbonate.

[0027] Among them, epoxy acrylate has strong adhesion and fast curing speed. As a substrate for black ink, it can improve the adhesion of the ink and reduce the curing time. Pentaerythritol triacrylate can be used as a diluent to adjust the viscosity of the ink and can also participate in the curing of epoxy acrylate to further improve the adhesion of the ink. The initiator can initiate the polymerization and cross-linking reaction of epoxy acrylate and pentaerythritol triacrylate. Carbon black has good tinting power and can provide a rich black. Adding palmitic acid-modified barium carbonate to the ink can improve the light-shielding effect of the ink and improve the fluidity of the ink, so that the carbon black is evenly dispersed in the ink, thereby improving the light-shielding property of the ink layer.

[0028] In some embodiments, the palmitic acid-modified barium carbonate is prepared by wet surface modification of sodium palmitate and nano-barium carbonate. Since palmitic acid is insoluble in water at room temperature, sodium palmitate can be prepared by adding palmitic acid to a sodium hydroxide solution and stirring for a period of time, thereby facilitating surface modification of nano-barium carbonate.

[0029] In some embodiments, the initiator is any one or a combination of p-dimethylaminobenzoic acid isooctyl ester, trimethylbenzoyl-diphenylphosphine oxide and 2-hydroxy-2-methyl-1-phenyl-1-propanone. P-dimethylaminobenzoic acid isooctyl ester, trimethylbenzoyl-diphenylphosphine oxide and 2-hydroxy-2-methyl-1-phenyl-1-propanone all have good photoinitiation efficiency and can efficiently initiate the polymerization and crosslinking reaction of epoxy acrylate and pentaerythritol triacrylate.

[0030] A second aspect of an embodiment of the present invention provides a method for preparing a light leakage-proof display screen, comprising: Black ink is printed around the front edge, back edge and side of the glass panel and cured at room temperature. The handwriting film is bonded to the front of the glass panel using optical glue, and the sensor is bonded to the back of the glass panel using optical glue to obtain a light leakage-proof display screen.

[0031] Optical adhesive has high adhesion and high transparency, and can firmly adhere the handwriting film and sensor to the front and back of the glass panel respectively, while maintaining a high clarity of the display.

[0032] In some embodiments, the method for preparing the black ink comprises: Take epoxy acrylate and pentaerythritol triacrylate, mix them evenly, add palmitic acid-modified barium carbonate, initiator and carbon black, grind for 1h-2h to obtain black ink. Grinding can make carbon black better dispersed in epoxy acrylate and pentaerythritol triacrylate, make the carbon black in the ink more closely bonded with epoxy acrylate and pentaerythritol triacrylate, thereby improving the durability of the ink.

[0033] In some embodiments, the method for preparing the palmitic acid-modified barium carbonate comprises: Take nano-barium sulfate and add it into water to prepare nano-barium sulfate suspension, raise the temperature to 60-80°C, add sodium palmitate, emulsify at high speed at 3000-4000rpm for 20min-30min, wash with water, filter and dry to obtain palmitic acid modified barium carbonate.

[0034] Among them, high-speed emulsification can make sodium palmitate and nano-barium sulfate fully contact, adsorb and coat under the action of liquid shear force, thereby realizing the modification of barium carbonate by sodium palmitate. It should be noted that the reaction temperature is 60℃-80℃. When the temperature is low, there is a large amount of water on the surface of nano-barium sulfate particles, which will affect the effect of palmitic acid adsorbing on the surface of nano-barium sulfate; when the temperature is high, the thermal motion between molecules intensifies and the reaction rate will accelerate.

[0035] In some embodiments, the mass ratio of the nano-barium sulfate to sodium palmitate is 1:0.2-0.5. If the mass ratio of the nano-barium sulfate to sodium palmitate is too small, the amount of palmitic acid coated on the surface of the nano-barium sulfate is small, and the modification effect is not good. If the mass ratio of the nano-barium sulfate to sodium palmitate is too large, it is easy to cause adhesion between the nano-barium sulfates, resulting in the aggregation of the nano-barium sulfate, which reduces the modification effect. Therefore, the mass ratio of the nano-barium sulfate to sodium palmitate is set to 1:0.2-0.5.

[0036] The present invention will be further described below by way of specific embodiments.

[0037] The experimental methods in the following examples are conventional methods unless otherwise specified; the experimental materials used in the following examples are purchased from commercial channels unless otherwise specified.

[0038] Example 1 Nano-barium sulfate was added into water to prepare a nano-barium sulfate suspension, the temperature was raised to 60° C., sodium palmitate was added, the mass ratio of nano-barium sulfate to sodium palmitate was 1:0.2, high-speed emulsification was performed at 3000 rpm for 20 min, the mixture was washed with water, filtered, and dried to obtain palmitic acid-modified barium carbonate.

[0039] According to weight, 20 parts of epoxy acrylate and 20 parts of pentaerythritol triacrylate were taken and mixed evenly, and 4 parts of palmitic acid-modified barium carbonate, 3 parts of initiator and 5 parts of carbon black were added, and the mixture was ground for 1 hour to obtain black ink.

[0040] Black ink is printed around the front edge, back edge and side of the glass panel and cured at room temperature. The handwriting film is bonded to the front of the glass panel using optical glue, and the sensor is bonded to the back of the glass panel using optical glue to obtain a light leakage-proof display screen.

[0041] The thickness of the ink layer is 5 μm.

[0042] Example 2 Nano-barium sulfate was added into water to prepare a nano-barium sulfate suspension, the temperature was raised to 80° C., sodium palmitate was added, the mass ratio of nano-barium sulfate to sodium palmitate was 1:0.5, high-speed emulsification was performed at 4000 rpm for 30 min, the mixture was washed with water, filtered, and dried to obtain palmitic acid-modified barium carbonate.

[0043] According to weight, 30 parts of epoxy acrylate and 30 parts of pentaerythritol triacrylate were taken and mixed evenly, and 6 parts of palmitic acid-modified barium carbonate, 6 parts of initiator and 8 parts of carbon black were added, and ground for 2 hours to obtain black ink.

[0044] Black ink is printed around the front edge, back edge and side of the glass panel and cured at room temperature. The handwriting film is bonded to the front of the glass panel using optical glue, and the sensor is bonded to the back of the glass panel using optical glue to obtain a light leakage-proof display screen.

[0045] The thickness of the ink layer is 10 μm.

[0046] Example 3 The method is consistent with Example 1, except that the mass ratio of nano barium sulfate to sodium palmitate is 1:0.5.

[0047] Example 4 The same as Example 1, except that the thickness of the ink layer is 10 μm.

[0048] Example 5 The method is consistent with Example 2, except that the mass ratio of nano-barium sulfate to sodium palmitate is 1:0.2.

[0049] Example 6 The same as Example 2, except that the thickness of the ink layer is 5 μm.

[0050] Comparative Example 1 The same as Example 1, the difference is that the ink layer is only provided around the back edge of the glass panel.

[0051] Comparative Example 2 The same as Example 1, except that the black ink does not include palmitic acid-modified barium carbonate.

[0052] Display light leakage test: The light leakage-proof display screens of the above-mentioned Examples 1-6 and Comparative Example 2 are tested for light transmittance, specifically as follows: the light leakage-proof display screen is installed on a display device (such as a mobile phone, a television), the display device is started, and the display device is observed to see if there is light leakage. If light leakage is found, the test result is unqualified; if no light leakage is found, the test result is qualified. The test results are shown in Table 1.

[0053] Table 1

[0054] It can be seen from Table 1 that in Comparative Example 1, since the ink layer is only arranged around the back edge, the light of the backlight module will pass through the top and sides of the glass panel to form scattering, causing light leakage on the display screen. By arranging the ink layer around the front edge, the back edge and the sides of the glass panel, the light of the backlight module can be prevented from passing through the top and sides of the glass panel to form scattering, thereby preventing light leakage on the sides of the display screen.

[0055] Ink layer light transmittance test: The light transmittance test of the ink layer in the light leakage prevention display screen of the above-mentioned Examples 1-6 and Comparative Example 1 is carried out as follows: the light leakage prevention display screen is installed on a display device (such as a mobile phone, a television), the display device is started, and it is observed whether light can be clearly seen passing through the printed ink layer. If light can be seen passing through, the test result is unqualified; if light cannot be seen passing through, the test result is qualified. The test results are shown in Table 2.

[0056] Table 2

[0057] It can be seen from Table 2 that palmitic acid-modified barium carbonate is not added to the black ink of Comparative Example 2. When the thickness of the ink layer is 5 μm, light will pass through the ink layer, resulting in light leakage. By adding palmitic acid-modified barium carbonate to the ink, the light-shielding effect of the ink can be improved.

[0058] Ink adhesion test: The adhesion test of the black ink prepared in the above Examples 1-6 and Comparative Example 2 was performed as follows: Referring to GB / T9286-1998, black ink was applied to the substrates respectively. After curing at room temperature, several small squares of 4mm×4mm were scratched with a knife, and then taped and torn off at 90°. The adhesion of the ink was evaluated by the test surface grade of the scratch test. The test results are shown in Table 3.

[0059] Table 3

[0060] Among them, level 0 means that the cutting edge is completely smooth without any peeling, and level 1 means that a small amount of coating has fallen off at the intersection of the cuts, and the total damaged cutting area cannot be significantly greater than 5%. It can be seen from Table 3 that the adhesion of Comparative Example 2 without the addition of palmitic acid-modified barium carbonate is poor.

[0061] Fluidity test: The black ink prepared in the above Examples 1-6 and Comparative Example 2 was tested for fluidity, as follows: Refer to the national standard GB / T14624.3-2008 to characterize the fluidity of ink. Take 1 mL of ink and put it in the fluidity tester. Cover it with a glass sheet and put a weight on it. Read the number after 15 minutes. Use a ruler to measure the expanded diameter of the sample. The diameter indicates the fluidity.

[0062] Table 4

[0063] It can be seen from Table 4 that the fluidity of Comparative Example 2 is poor, which is 13 mm lower than that of Example 1. This shows that adding palmitic acid-modified barium carbonate can improve the fluidity of the ink, help to evenly disperse carbon black in the ink, and improve the light-shielding property of the ink layer.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the protection scope of the present invention.

Claims

1. A light leakage prevention display screen, characterized in that: include: A handwriting film, a glass panel and a sensor are stacked in sequence, an ink layer is arranged around the front edge, the back edge and the side of the glass panel, the handwriting film is bonded to the front of the glass panel, and the sensor is bonded to the back of the glass panel.

2. The light leakage prevention display screen according to claim 1, characterized in that: The thickness of the ink layer is 5 μm-10 μm.

3. The light leakage prevention display screen according to claim 1, characterized in that: The ink layer is made by printing black ink onto a glass panel.

4. The light leakage prevention display screen according to claim 3, characterized in that: The black ink comprises the following components by weight: 20-30 parts of epoxy acrylate, 20-30 parts of pentaerythritol triacrylate, 3-6 parts of initiator, 5-8 parts of carbon black and 4-6 parts of palmitic acid-modified barium carbonate.

5. The light leakage prevention display screen according to claim 4, characterized in that: The palmitic acid-modified barium carbonate is prepared by wet surface modification of sodium palmitate and nano-barium carbonate.

6. The light leakage prevention display screen according to claim 3, characterized in that: The initiator is any one or a combination of p-dimethylaminobenzoic acid isooctyl ester, trimethylbenzoyl-diphenylphosphine oxide and 2-hydroxy-2-methyl-1-phenyl-1-propanone.

7. The method for preparing a light leakage-proof display screen according to any one of claims 1 to 6, characterized in that: include: Black ink is printed around the front edge, back edge and side of the glass panel and cured at room temperature. The handwriting film is bonded to the front of the glass panel using optical glue, and the sensor is bonded to the back of the glass panel using optical glue to obtain a light leakage-proof display screen.

8. The preparation method according to claim 7, characterized in that: The preparation method of the black ink comprises: Take epoxy acrylate and pentaerythritol triacrylate, mix them evenly, add palmitic acid-modified barium carbonate, initiator and carbon black, grind for 1h-2h, and obtain black ink.

9. The preparation method according to claim 8, characterized in that: The preparation method of the palmitic acid-modified barium carbonate comprises: Take nano-barium sulfate and add it into water to prepare nano-barium sulfate suspension, raise the temperature to 60-80°C, add sodium palmitate, emulsify at high speed at 3000-4000rpm for 20min-30min, wash with water, filter and dry to obtain palmitic acid modified barium carbonate.

10. The preparation method according to claim 9, characterized in that: The mass ratio of the nano barium sulfate to sodium palmitate is 1:0.2-0.5.

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