Mask for preparing light leakage preventing liquid crystal light valve and light leakage preventing liquid crystal light valve thereof

Abstract

The utility model discloses a kind of mask for preparing leakproof light liquid crystal light valve and its leakproof light liquid crystal light valve, its mask is additionally increased auxiliary mask layer on the basis of original main mask layer, so that the black pattern of main mask layer and the full black film of auxiliary mask layer form double light shielding pattern, so even if the black pattern of main mask layer appears light transmission needle eye due to the limitation of printing process, the full black film of auxiliary mask layer can also effectively shield the ultraviolet light emitted by exposure machine, to avoid the appearance of light transmission needle eye on ITO glass, and further avoid the appearance of light transmission needle eye on liquid crystal light valve, prevent the appearance of leaky light bad phenomenon of liquid crystal light valve, maximumly guarantee the display blackness of liquid crystal light valve, improve the light shielding performance of liquid crystal light valve and electric welding goggles or electric welding face guard.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display technology, specifically to a mask for preparing a liquid crystal light valve with anti-leakage and the liquid crystal light valve itself. Background Technology

[0002] As a key component of welding goggles or welding masks, the liquid crystal light valve prevents eye damage from the intense welding light and harmful radiation such as ultraviolet and infrared rays generated by the electric arc, thus preventing photokeratitis. In welding goggles or masks, the liquid crystal light valve and photosensitive device are mounted together on the frame or mask. The liquid crystal light valve acts as a lens, and the photosensitive device senses the intense light generated during welding. When the photosensitive device does not sense the intense light generated during welding, the liquid crystal light valve does not operate, and the entire screen remains transparent. When the photosensitive device senses the intense light generated during welding, the liquid crystal light valve operates, and the entire screen displays black, thus blocking the intense light from harming the eyes. The liquid crystal light valve has extremely high requirements for its display area; its display blackness determines the light transmittance and also the light-blocking performance of the liquid crystal light valve and the welding goggles or welding mask.

[0003] The main production processes for ITO glass substrates in liquid crystal displays (LCDs) include ITO glass cleaning, photoresist coating, exposure, development, acid etching, and the formation of the patterns required for the product. Among all the production processes, the exposure process is a crucial step affecting the black levels of the LCD display. The exposure process uses a mask to expose the photoresist-coated ITO glass. The mask has opaque and transparent areas. The opaque areas (the patterned areas of the mask) correspond to the display areas of the LCD, blocking the passage of ultraviolet light emitted by the exposure machine, preventing ultraviolet light from reaching the photoresist on the ITO glass. The transparent areas (the non-patterned areas of the mask) correspond to the non-display areas of the LCD, allowing ultraviolet light to pass through and enabling it to reach the photoresist on the ITO glass, causing a photochemical reaction.

[0004] Current exposure processes typically use only one photomask, which consists of a layer of black adhesive coated on transparent glass to form a light-blocking pattern (pattern area). This pattern corresponds to the display area of ​​the LCD screen. However, because the pattern area of ​​the photomask is applied to the transparent glass using a screen printing process, it inevitably contains some pinholes. When these pinholes exist, ultraviolet light emitted by the exposure machine will pass through them and react chemically with the photoresist on the ITO glass, resulting in pinholes appearing in the display area of ​​the LCD screen. For non-full-screen displays and ordinary LCD screens where black levels are not critical, these pinholes do not significantly affect the overall display quality. However, for full-screen displays and liquid crystal light valves that have extremely high requirements for display black levels, the presence of light-transmitting pinholes in the display area will affect the display black level of the liquid crystal light valve, causing light leakage at the light-transmitting pinholes. This can lead to the strong light generated by welding passing through these light-transmitting pinholes and causing damage to the human eye. Utility Model Content

[0005] The present invention addresses the problem that existing liquid crystal light valve masks have light-transmitting pinholes that affect the display blackness of the liquid crystal light valve, thus causing light leakage. The present invention provides a mask for manufacturing a light-leakage-proof liquid crystal light valve and the same light-leakage-proof liquid crystal light valve.

[0006] To solve the above problems, this utility model is achieved through the following technical solution:

[0007] A mask for fabricating a light-leakage-proof liquid crystal light valve is characterized by comprising a main mask layer and an auxiliary mask layer; the main mask layer consists of a transparent substrate and a black pattern coated on the transparent substrate, wherein the shape of the black pattern corresponds to the shape of the display area of ​​the liquid crystal light valve; the auxiliary mask layer consists of a cutout frame and a completely black film embedded in the cutout holes of the cutout frame, wherein the shape of the completely black film corresponds to the shape of the display area of ​​the liquid crystal light valve; the auxiliary mask layer and the main mask layer are stacked on top of each other, and the completely black film of the auxiliary mask layer and the black pattern of the main mask layer are aligned in their stacking direction.

[0008] In the above scheme, the lower surface of the hollow frame of the auxiliary mask layer is in close contact with the upper surface of the transparent substrate of the main mask layer in its stacking direction, and there is a gap between the all-black film of the auxiliary mask layer and the black pattern of the main mask layer in its stacking direction.

[0009] In the above scheme, the auxiliary mask layer is stacked on top of the main mask layer, that is, the auxiliary mask layer is located on one side of the exposure machine, and the main mask layer is located on the side of the ITO glass.

[0010] The light leakage prevention liquid crystal light valve consists of two upper and lower ITO glass substrates, an annular frame sealant disposed between the upper and lower ITO glass substrates, and liquid crystal injected into the annular frame sealant and located between the upper and lower ITO glass substrates; wherein the upper and lower ITO glass substrates are both prepared using the aforementioned photomask.

[0011] Compared with existing technologies, this invention improves the mask used in the production of liquid crystal light valves by adding an auxiliary mask layer on top of the original main mask layer. This creates a double light-blocking pattern between the black pattern of the main mask layer and the all-black film of the auxiliary mask layer. Even if pinholes appear in the black pattern of the main mask layer due to printing process limitations, the all-black film of the auxiliary mask layer can effectively block the ultraviolet light emitted by the exposure machine, preventing pinholes on the ITO glass and thus preventing light leakage in the liquid crystal light valve. This maximizes the blackness of the liquid crystal light valve and improves the light-blocking performance of the liquid crystal light valve and welding goggles or welding masks. This invention can utilize existing liquid crystal display manufacturing processes, is easy to manufacture and implement, has low production costs, solves the problem of pinholes during the exposure process, and effectively improves the yield rate of liquid crystal light valves. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a mask used to fabricate a liquid crystal light valve that prevents light leakage.

[0013] Figure 2 This is a schematic diagram of a liquid crystal light valve designed to prevent light leakage.

[0014] The diagram is labeled as follows: 1. Main mask layer; 1-1. Transparent substrate; 1-2. Black pattern; 2. Auxiliary mask layer; 2-1. Hollow frame; 2-2. All-black film; 3. ITO glass substrate; 4. Frame adhesive; 5. Liquid crystal. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with specific examples and the accompanying drawings. It should be noted that directional terms mentioned in the examples, such as "up," "down," "middle," "left," "right," "front," and "back," are only for reference to the directions in the accompanying drawings. Therefore, the directions used are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0016] A photomask for fabricating a light-leakage-proof liquid crystal light valve, such as Figure 1 As shown, it consists of two parts: the main mask layer 1 and the auxiliary mask layer 2.

[0017] The main mask layer 1 consists of a transparent substrate 1-1 and black patterns 1-2 coated on the transparent substrate 1-1, wherein the shape of the black patterns 1-2 corresponds to the shape of the display area of ​​the liquid crystal light valve. The transparent substrate 1-1 is a flat plate made of transparent materials such as glass or plexiglass. In a preferred embodiment of this invention, a transparent glass substrate is used for the transparent substrate 1-1 to improve its transparency. The black patterns 1-2 are black adhesives coated on the transparent substrate 1-1 by screen printing. The number of black patterns 1-2 coated on the transparent substrate 1-1 corresponds to the number of ITO glass substrates 3 used to produce the liquid crystal light valve in one go before ITO glass cutting. In a preferred embodiment of this invention, there are multiple black patterns 1-2 coated on the transparent substrate 1-1 (e.g., 12), and these black patterns 1-2 are arranged in a regular matrix (e.g., in a 3x4 matrix), with each black pattern 1-2 corresponding to one ITO glass substrate 3.

[0018] The auxiliary mask layer 2 consists of a hollow frame 2-1 and a full-black film 2-2 embedded in the hollow holes of the hollow frame 2-1. The shape of the full-black film 2-2 matches the shape of the display area of ​​the liquid crystal light valve. The edges of the full-black film 2-2 are connected to the edges of the corresponding hollow holes on the hollow frame 2-1, so that the full-black film 2-2 can completely cover the hollow holes it is embedded in. The hollow frame 2-1 is a frame structure made of non-deformable materials such as wood or plastic, and has hollow holes for mounting the full-black film 2-2. In a preferred embodiment of this utility model, the hollow frame 2-1 is made of wood to reduce production costs. The full-black film 2-2 is a black film. The number of hollow holes on the hollow frame 2-1 for embedding the full-black film 2-2, i.e., the number of full-black films 2-2, is consistent with the number of ITO glass substrates 3 used to produce the liquid crystal light valve in one go before ITO glass cutting. In a preferred embodiment of this utility model, the number of the hollowed-out holes of the hollowed-out frame 2-1, i.e., the number of all-black films 2-2, is multiple (e.g., 12), and these all-black films 2-2 are arranged in a regular matrix (e.g., arranged in 3 rows and 4 columns), with each all-black film 2-2 corresponding to an ITO glass substrate 3.

[0019] The auxiliary mask layer 2 and the main mask layer 1 are stacked on top of each other. In a preferred embodiment of this invention, the auxiliary mask layer 2 is stacked above the main mask layer 1, that is, the auxiliary mask layer 2 is located on the upper layer of the mask, facing the exposure machine side, and the main mask layer 1 is located on the lower layer of the mask, facing the ITO glass side. The lower surface of the cutout frame 2-1 of the auxiliary mask layer 2 is in close contact with the upper surface of the transparent substrate 1-1 of the main mask layer 1 in its stacking direction, and there is a gap between the all-black film 2-2 of the auxiliary mask layer 2 and the black pattern 1-2 of the main mask layer 1 in its stacking direction. When the auxiliary mask layer 2 and the main mask layer 1 are stacked, the all-black film 2-2 of the auxiliary mask layer 2 and the black pattern 1-2 of the main mask layer 1 are directly opposite each other in its stacking direction. The shape of each all-black film 2-2 and the shape of its corresponding black pattern 1-2 are exactly the same as the shape of the display area of ​​the liquid crystal light valve.

[0020] The size of each all-black film 2-2 and its corresponding black pattern 1-2 can be the same as the size of the display area of ​​the liquid crystal light valve. However, considering that in the actual production process, the ultraviolet light emitted by the exposure machine enters from above the mask, there is a certain gap between the all-black film 2-2 of the auxiliary mask layer 2 and the black pattern 1-2 of the main mask layer 1. In the preferred embodiment of this utility model, the edge size of the all-black film 2-2 of the auxiliary mask layer 2 is slightly smaller than the edge size of the black pattern 1-2 of the main mask layer 1. For example, the edge size of the all-black film 2-2 of the auxiliary mask layer 2 is 2mm smaller than the edge size of the black pattern 1-2 of the main mask layer 1.

[0021] In the exposure process of ITO glass for liquid crystal light valves: First, a mask is placed on ITO glass coated with photoresist, with the lower surface of the mask in contact with the upper surface of the ITO glass. Then, the exposure machine is started to emit ultraviolet light (UV light). Although the UV light emitted by the exposure machine will enter the ITO glass through the auxiliary mask layer 2 and the main mask layer 1, the UV light emitted by the exposure machine cannot directly pass through the double light-blocking pattern (the all-black film 2-2 of the auxiliary mask layer 2 and the black pattern 1-2 of the main mask layer 1) and thus cannot directly enter the ITO glass to react with the photoresist on the ITO glass, thereby forming a display area on the ITO glass. Compared to traditional single-layer black patterns, the double-shielded pattern, with its all-black film 2-2, can block the light-transmitting pinholes on the black pattern 1-2, thereby preventing ultraviolet light emitted by the exposure machine from entering the ITO glass through these pinholes. This prevents light-transmitting pinholes from appearing on the ITO glass and the liquid crystal light valve made from it, thus avoiding light leakage and improving the blackness of the liquid crystal light valve.

[0022] A liquid crystal light valve fabricated using the above-mentioned photomask, such as Figure 2As shown, the liquid crystal light valve mainly consists of two ITO glass substrates 3, an adhesive 4 disposed between the two ITO glass substrates 3, and liquid crystal 5 poured into the adhesive 4 and located between the two ITO glass substrates 3. Both the upper and lower ITO glass substrates 3 of this liquid crystal light valve are fabricated using the aforementioned photomask.

[0023] It should be noted that although the embodiments described above are illustrative, they are not intended to limit the present invention. Therefore, the present invention is not limited to the specific embodiments described above. Any other embodiments obtained by those skilled in the art under the guidance of the present invention without departing from its principles are considered to be within the protection scope of the present invention.

Claims

1. A photomask used to prepare a liquid crystal light valve with anti-leakage properties, characterized in that, The system includes a main mask layer (1) and an auxiliary mask layer (2). The main mask layer (1) consists of a transparent substrate (1-1) and a black pattern (1-2) coated on the transparent substrate (1-1), wherein the shape of the black pattern (1-2) is consistent with the shape of the display area of ​​the liquid crystal light valve. The auxiliary mask layer (2) consists of a cutout frame (2-1) and a full-black film (2-2) embedded in the cutout hole of the cutout frame (2-1), wherein the shape of the full-black film (2-2) is consistent with the shape of the display area of ​​the liquid crystal light valve. The auxiliary mask layer (2) and the main mask layer (1) are stacked on each other, and the full-black film (2-2) of the auxiliary mask layer (2) and the black pattern (1-2) of the main mask layer (1) are directly opposite each other in their stacking direction.

2. The mask for fabricating a light-leakage-proof liquid crystal light valve according to claim 1, characterized in that, The lower surface of the cutout frame (2-1) of the auxiliary mask layer (2) is in close contact with the upper surface of the transparent substrate (1-1) of the main mask layer (1) in its stacking direction, and there is a gap between the all-black film (2-2) of the auxiliary mask layer (2) and the black pattern (1-2) of the main mask layer (1) in its stacking direction.

3. The mask for fabricating a light-leakage-proof liquid crystal light valve according to claim 1, characterized in that, The auxiliary mask layer (2) is stacked on top of the main mask layer (1), that is, the auxiliary mask layer (2) is located on the side of the exposure machine, and the main mask layer (1) is located on the side of the ITO glass.

4. A light-leakage-proof liquid crystal light valve, comprising upper and lower ITO glass substrates (3), an annular frame sealant (4) disposed between the upper and lower ITO glass substrates (3), and liquid crystal (5) poured into the annular frame sealant (4) and located between the upper and lower ITO glass substrates (3); characterized in that, Both the upper and lower ITO glass substrates (3) are prepared using the mask as described in claim 1.

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