Mechanical switching device of LCD light valve

Abstract

The invention discloses a mechanical switching device of a liquid crystal display (LCD) light valve, the LCD light valve comprises an upper glass substrate, a lower glass substrate and a liquid crystal box clamped between the upper glass substrate and the lower glass substrate, and light enters from the upper glass substrate and exits from the lower glass substrate after passing through the liquid crystal box. The mechanical switching device comprises a glass plate, and the glass plate is attached to the incident surface of the upper glass substrate; the glass plate is longer than the upper glass substrate; the width of the glass plate is greater than that of the upper glass substrate; the thickness of the glass plate is greater than or equal to 0.4 mm; and the glass plate is made of optical glass with an amorphous structure. According to the invention, the loss of the LCD light valve in a certain probability in the projector assembly process can be reduced to zero, and raw materials and workpiece replacement time are saved. Meanwhile, the direct liquid cooling technology is adopted to cool the LCD light valve, the practical problem of how to simply and efficiently assemble the LCD light valve with peripheral materials can be effectively solved, and the direct liquid cooling technology can really and effectively generate value on domestic projectors.

Description

Technical Field

[0001] The present invention relates to the field of projectors, and particularly to a mechanical transfer device for an LCD light valve. Background Art

[0002] Refer to Figure 2 As shown, due to the particularity of the mechanical and electrical structures of the LCD light valve, the length (such as in the vertical screen) or width (such as in the horizontal screen) of the upper glass substrate 21 must be smaller than that of the lower glass substrate 23 (usually 3 - 6 mm smaller), because the driving ICs of the TFT array and the FPC cable connected to the external circuit need to be bonded on the lower glass substrate 23 ( Figure 2 as shown by 24 in the figure is the FPC cable). The part of the lower glass substrate 23 that is larger (or "greater") than the upper glass substrate 21 (refer to the shaded area 231 in Figure 2 the figure), because the thickness is usually in the range of 0.15 - 0.5 mm and is brittle, has a certain probability of damage (such as from a few per thousand to a few percent) during the production and assembly process of the projector. When mechanical damages such as broken corners or fractures occur in the area 231 of the lower glass substrate 23, the LCD light valve cannot display images normally, and it cannot be repaired. At the same time, replacing parts is also time-consuming.

[0003] Secondly, the brightness of domestic LCD projectors is getting higher and higher now, and people are constantly trying to use direct liquid cooling to dissipate heat from the LCD light valve. Currently, the light in the projector optical path must enter from the upper glass substrate of the LCD light valve, that is, from the color film side, and exit from the lower glass substrate, that is, the TFT side, otherwise serious image trailing will occur (the specific mechanism is common knowledge in the industry and will not be elaborated). If direct liquid cooling is used, if the outer wall surface of the lower glass substrate contacts the liquid, the heat dissipation effect is not stronger than that of traditional air cooling (the specific mechanism will not be elaborated). If the surface of the upper glass substrate contacts the liquid, currently in the industry, no simple, effective and low-cost installation and fixing method for the LCD light valve has been found, because the frame of the LCD light valve (the part around the display window) is very narrow, usually only about 0.8 - 1.2 mm, and it is very difficult to achieve sealed anti-leakage with the metal bracket / plastic bracket for installing the LCD light valve, because the bonding area is too small, resulting in far from enough bonding force. Whether it is the thermal expansion and contraction pressure of the cooling liquid at rest or the dynamic vibration and impact during transportation, the sealing reliability is not high, and the basic delivery quality for mass production cannot be achieved at all. Summary of the Invention

[0004] A mechanical adapter device for an LCD light valve provided by the present invention. In the present invention, a glass plate is attached to the surface of the upper glass substrate. When the LCD light valve is installed, the structural device for fixing the LCD light valve (such as common structural forms like plastic brackets, metal brackets, card slots, etc.) only needs to contact the glass plate, and there is no need to have substantial contact with the upper glass substrate and the lower glass substrate. Therefore, the LCD light valve is not subject to additional complex stresses, eliminating the loss of the LCD light valve during the projection machine manufacturing process.

[0005] The specific technical solution adopted by the present invention is as follows:

[0006] A mechanical adapter device for an LCD light valve, wherein the LCD light valve includes an upper glass substrate, a lower glass substrate, and a liquid crystal cell sandwiched between the upper glass substrate and the lower glass substrate. Light enters from the upper glass substrate and exits from the lower glass substrate after passing through the liquid crystal cell;

[0007] The mechanical adapter device includes a glass plate, and the glass plate is attached to the incident surface of the upper glass substrate; the length of the glass plate is greater than the length of the upper glass substrate; the width of the glass plate is greater than the width of the upper glass substrate; the thickness of the glass plate ≥ 0.4 mm; the material of the glass plate is an optical glass with a non-crystalline structure.

[0008] Preferably, when the glass plate is attached to the incident surface of the upper glass substrate, a transparent optical adhesive or an ultraviolet adhesive is used for bonding and curing.

[0009] The beneficial effects of the present invention are as follows:

[0010] 1. In the present invention, a glass plate is attached to the surface of the upper glass substrate, and the LCD light valve is installed inside the projector through the glass plate. When the LCD light valve is installed, there is no substantial contact with the upper glass substrate and the lower glass substrate, and it is not subject to additional complex stresses, eliminating the loss of the LCD light valve during the projection machine manufacturing process. The present invention can reduce the loss of the LCD light valve during the projection machine assembly process with a certain probability to zero, saving raw materials and replacement part working hours.

[0011] 2. When the glass plate of the present invention is attached to the incident surface of the upper glass substrate, a transparent optical adhesive or an ultraviolet adhesive is used for bonding and curing, which can easily achieve automated production, and the increased comprehensive cost is extremely low.

[0012] 3. The present invention can be simply and conveniently connected to a metal bracket that adopts a liquid cooling heat dissipation method. A sealed cavity for filling a cooling liquid is formed between the metal bracket and the glass plate. The cooling liquid is in contact with the glass plate. Although the glass plate has a large thermal resistance in the thickness direction, if the projector outputs a luminous flux of 1000 lumens, the ANSI uniformity is 80%, the glass plate thickness is 0.5-0.7mm, the material is H-K9L, the thermal conductivity is 1.2w / m·k, and the LCD light valve is 4.5 inches, the glass plate (thickness direction) only increases by 2-3℃ during heat transfer, and has no essential effect on the heat dissipation effect of the LCD light valve. Therefore, the product that uses direct liquid cooling technology to cool the LCD light valve can effectively solve the practical problem of how to achieve simple and efficient assembly of the LCD light valve with surrounding materials, so that the direct liquid cooling technology can truly and effectively create value on domestic projectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural schematic diagram of the mechanical switching device of the LCD light valve of the present invention;

[0015] Figure 2 A schematic diagram of the appearance (including side view) of an LCD light valve;

[0016] Figure 3 This is a schematic diagram of the common installation methods of LCD light valves in existing domestic LCD projectors;

[0017] Figure 4 for Figure 3 Schematic diagram of the completed assembly;

[0018] Figure 5 It is a schematic diagram of the present invention applied to direct liquid cooling of LCD light valves.

[0019] Description of the above-mentioned reference numerals:

[0020] 1. Glass plate, 21. Upper glass substrate, 22. Liquid crystal box, 23. Lower glass substrate, 231. Area, 24. FPC cable, 3. Plastic bracket, 31. Inverted, 4. Metal bracket, 5. Coolant. DETAILED DESCRIPTION

[0021] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not have any restrictive effect on the protection scope of the present invention.

[0022] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0023] It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0024] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0025] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "install", "connect", "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Embodiment 1

[0027] See Figure 1As shown in the figure (the arrow in the figure represents the direction of the light of the projector), the mechanical switching device of the LCD light valve provided in this embodiment includes an upper glass substrate 21, a lower glass substrate 23 and a liquid crystal box 22 sandwiched between the upper glass substrate 21 and the lower glass substrate 23. Light is incident from the upper glass substrate 21, and is emitted from the lower glass substrate 23 after passing through the liquid crystal box 22. It should be particularly noted that a piece of glass having main microstructures such as a color filter array, a black frame (BM array), and a common electrode (IT0) on the inner wall surface is defined as the upper glass substrate 21 in the industry, and correspondingly, a piece of glass having main microstructures such as a TFT array on the inner wall surface is defined as the lower glass substrate 23 in the industry.

[0028] The present embodiment provides a mechanical switching device for an LCD light valve, comprising a glass plate 1, wherein the glass plate 1 is in contact with an incident surface of an upper glass substrate 21, the length of the glass plate 1 is greater than the length of the upper glass substrate 21; the width of the glass plate 1 is greater than the width of the upper glass substrate 21; the thickness of the glass plate 1 is ≥0.4 mm, and the material of the glass plate 1 is optical glass with an amorphous structure.

[0029] See also Figure 3 , Figure 4 The common installation method of the LCD light valve of the existing domestic LCD projector is shown. This structural design is very simple and universal. In fact, it is to use plastic (such as ABS, ABS+PC and other materials) after injection molding. Because of its low rigidity, it has a certain deformation elasticity or ductility under external force. After the plastic bracket 3 is properly stretched and deformed, the LCD light valve is inserted into the undercut 31 (the number of undercuts 31 is usually 3-4) to achieve the installation of the LCD light valve, and then the plastic bracket 3 is installed inside the projector. However, in the process of the projector, it is always impossible to avoid mechanical damage such as broken corners and fragmentation of the lower glass substrate 23 (i.e., area 231), which causes physical damage to the LCD light valve, and it is also time-consuming to replace the parts.

[0030] In this embodiment, after a glass plate 1 is attached to the surface of the upper glass substrate 21, the LCD light valve is installed inside the projector through the glass plate 1. Figure 3 , Figure 4 In the common installation method and structure shown in the figure, the undercut 31 only needs to clamp the glass plate 1, and does not need to have substantial contact with the upper glass substrate 21 and the lower glass substrate 23. The LCD light valve is not subject to additional complex stresses, such as thermal expansion and contraction of the plastic bracket 3, and impacts such as transportation, which prevents the loss of the LCD light valve during the projector process. This embodiment reduces the loss of the LCD light valve to zero with a certain probability during the projector assembly process, saving raw materials and labor hours for replacement. Furthermore, if the glass plate 1 has abnormalities such as broken corners and local damage to the edges, it has no effect on the image quality of the projector and can still be delivered to the market.

[0031] When the LCD light valve is installed inside the projector through the glass plate 1 in this embodiment, a card slot matching the glass plate 1 can be set inside the projector, or the glass plate 1 can be snapped into a plastic bracket 3 similar to the existing one through the existing reverse buckle 31, and then the plastic bracket 3 is installed inside the projector, and no specific limitation is made.

[0032] Preferably in this embodiment, when the glass plate 1 is attached to the incident surface of the upper glass substrate 21, a transparent optical adhesive (also known as OCA in the industry) or an ultraviolet adhesive (UV adhesive) is used for bonding and curing, which can very easily realize automated production, and the increased comprehensive cost is extremely low (for example, the size of the upper glass substrate 21 of the 3.5-inch LCD light valve of BOE is 80.9mm * 48.31mm, the glass plate 1 is selected as a domestic H-K9L glass with a size of 85mm * 53mm and a thickness of 0.7mm, and the increased cost is less than one yuan, while the purchase price of this LCD light valve is as high as 65 yuan). Compared with the labor cost caused by damaging the LCD light valve and then causing the replacement part process, it is still cost-effective.

[0033] Embodiment 2

[0034] As described above, for the direct liquid cooling heat dissipation method of the LCD light valve, the industry has not yet found a simple, effective and low-cost LCD light valve installation and fixing method (there are many liquid cooling invention innovations in the industry, but no actual products have been put on the market, but there are indeed false propaganda liquid cooling products). See Figure 5 As shown, 4 in the figure is a metal bracket and 5 is a coolant. This type of design is also the basic production form of direct liquid cooling. Generally speaking, it is a necessary way for the surface of the upper glass substrate 21 to contact the liquid (because the heat dissipation effect of the surface of the lower glass substrate 23 contacting the liquid is not significant). Obviously, because the bonding area between the upper glass substrate 21 and the metal bracket 4 is too small, reliable anti-leakage cannot be achieved, and thus there is no meaning of mass production at all. In this embodiment, the metal bracket 4 is connected to the glass plate 1 (simply bonded with silicone rubber), and first, the problem of the bonding area can be easily solved, and then the reliability of anti-leakage is achieved.

[0035] In this embodiment, although the heat transfer ability of the glass plate 1 in the thickness direction is not good, for example, the projector outputs a light flux of 1000 lumens (the heat power can be known), the ANSI uniformity is 80% (the quantitative distribution of the heat quantity can be known), the thickness of the glass plate 1 is 0.5 - 0.7 mm, the thermal conductivity is 1.2 w / m·k, the material is H-K9L, the LCD light valve is 4.5 inches (the heat transfer cross-section can be known), the temperature increase of the glass plate 1 (in the thickness direction) due to the increase in conduction thermal resistance is only 2 - 3 °C (compared with the case where the incident surface of the upper glass substrate 21 is directly in contact with the coolant 5). This has no essential impact on the heat dissipation effect of the LCD light valve. Therefore, for products that use the direct liquid cooling technology to cool the LCD light valve, this embodiment can effectively solve the practical problem of how to simply and efficiently assemble the LCD light valve with surrounding materials, achieve reliable anti-leakage, and enable the direct liquid cooling technology to truly and effectively generate value on domestic projectors.

[0036] In addition, refer to a light valve heat dissipation device and a fully sealed LCD projection optical machine disclosed in CN113376939A. Its core innovation is to bond sapphire glass to the surface of the LCD light valve to facilitate the heat transfer of the LCD light valve, that is, through the relatively high in-plane thermal conductivity of the sapphire glass, the heat of the LCD light valve is transferred to the periphery of the sapphire glass and then to the structural support (similar to Figure 5 the metal support 4 in ), and the heat of the LCD light valve is quickly diffused into the air through the structural support. This is essentially different from the present invention. First, the glass plate 1 of the present invention is not an expensive crystal (currently, sapphire glass is obtained by cutting a wafer into a rectangular form, and because the Fresnel loss is too large, an anti-reflection film must be coated. The size of the light valve of domestic single LCD projectors is particularly large. Due to cost reasons, the market acceptance of sapphire glass is very low, resulting in poor practicability), but ordinary optical glass, and it does not have the in-plane long-distance (such as from the center to the edge of the display window) heat transfer ability. At the same time, the present invention provides a simple and efficient solution for the assembly of the LCD light valve to the metal support 4 in the direct liquid cooling method to solve problems such as damage and anti-leakage during the installation of the LCD light valve.

[0037] It should be noted that in this article, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0038] In this article, specific examples are used to illustrate the principles and implementation methods of the present invention. The descriptions of the above examples are only used to help understand the method and its core idea of the present invention. The above is only the preferred implementation method of the present invention. It should be noted that due to the limited nature of literal expression and the objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, shall all be regarded as the protection scope of the present invention.

Claims

1. A mechanical adapter device for an LCD light valve, the LCD light valve comprising an upper glass substrate (21), a lower glass substrate (23), and a liquid crystal cell (22) sandwiched between the upper glass substrate (21) and the lower glass substrate (23), light entering from the upper glass substrate (21) and exiting from the lower glass substrate (23) after passing through the liquid crystal cell (22), characterized in that: The mechanical adapter device comprises a glass plate (1), the glass plate (1) being in contact with the incident surface of the upper glass substrate (21); the length of the glass plate (1) is greater than the length of the upper glass substrate (21); the width of the glass plate (1) is greater than the width of the upper glass substrate (21); the thickness of the glass plate (1) ≥ 0.4 mm; the material of the glass plate (1) is an optical glass with a non-crystalline structure.

2. The mechanical adapter device of an LCD light valve according to claim 1, characterized in that, When the glass plate (1) is in contact with the incident surface of the upper glass substrate (21), it is bonded and cured using a transparent optical adhesive or an ultraviolet adhesive.

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