Liquid crystal screen frame, projection ray machine and projector

Abstract

The utility model relates to a liquid crystal screen frame, a projection ray machine and a projector. The liquid crystal screen frame comprises a frame body, the frame body is provided with an installation cavity used for installing a liquid crystal screen, the inner side wall of the installation cavity is provided with a convex pattern group, the convex pattern group comprises a plurality of convex patterns arranged at intervals in the first direction, a groove extending in the second direction is defined between every two adjacent convex patterns, and the first direction and the second direction intersect with each other. The groove extending along the second direction is defined between the two adjacent raised lines, so that stray light emitted by the liquid crystal screen and incident to the inner side wall of the frame body can be shielded by the groove and is reflected for multiple times in the groove to be attenuated, and the part of stray light does not enter a rear optical system any more. And the part of light is prevented from influencing imaging quality.

Description

Technical Field

[0001] The present application relates to the technical field of liquid crystal screen frames, and in particular to a liquid crystal screen frame, a projection optical machine and a projector. Background Art

[0002] In the design of the projection optical machine, the LCD screen needs to be supported and fixed by a screen frame, or in other words, the LCD screen needs to be installed by a screen frame.

[0003] The LCD screen frame in the related art easily causes stray light spots to form on the edge of the effective image finally formed by the projection optical machine, thus affecting the imaging quality. Utility Model Content

[0004] Based on this, it is necessary to provide a LCD screen frame, a projection light machine and a projector to address the problem that the LCD screen frame in the related technology easily causes stray light spots to form on the edge of the effective picture finally formed by the projection light machine, thereby affecting the imaging quality.

[0005] According to one aspect of the present application, a liquid crystal screen frame is provided, the liquid crystal screen frame comprising:

[0006] A frame body, wherein the frame body has a mounting cavity for mounting a liquid crystal screen;

[0007] Wherein, a convex pattern group is provided on the inner side wall of the installation cavity, and the convex pattern group includes a plurality of convex patterns arranged at intervals along the first direction, and a groove extending along the second direction is defined between two adjacent convex patterns;

[0008] The second direction is parallel to the axial direction of the installation cavity, and the first direction and the second direction intersect each other.

[0009] In one embodiment, the frame body includes two side frame plates that are opposite to each other and spaced apart along a third direction, and the mounting cavity is formed between the two side frame plates;

[0010] The inner side walls of both side frame panels are provided with a group of convex patterns;

[0011] The first direction, the second direction and the third direction intersect each other.

[0012] In one embodiment, the intervals between two adjacent convex patterns along the first direction are the same.

[0013] In one embodiment, the distance between two adjacent convex patterns along the first direction is x, and x satisfies the following relationship: 0<x≤1mm.

[0014] In one embodiment, the groove is arranged to be concave outward in an arc shape; and / or

[0015] The convex pattern includes two convex pattern parts which are connected at one end and arranged at an angle, and the groove is formed between two adjacent convex pattern parts in the adjacent convex patterns.

[0016] In one of the embodiments, the LCD screen frame further includes a first side support portion provided on the inner side wall of the installation cavity;

[0017] A first limiting member is also provided on the side frame plate. Along the axial direction of the installation cavity, the first limiting member is opposite to and spaced from the first side support portion so as to limit the liquid crystal screen between the first limiting member and the first side support portion.

[0018] In one embodiment, the LCD screen frame further includes a second side support portion, and the second side support portion and the first side support portion are arranged on the inner side wall of the side frame plate at intervals along the axial direction of the installation cavity;

[0019] A second limiting member is also provided on the side frame plate. Along the axial direction of the mounting cavity, the second limiting member is opposite to and spaced from the second side support portion so as to limit the first Fresnel lens between the second limiting member and the second side support portion.

[0020] In one embodiment, the frame body further includes a bottom frame plate, which is connected between the two side frame plates. The bottom frame plate is provided with at least one vent, which is arranged at least toward the first Fresnel lens.

[0021] According to another aspect of the present application, the present application also provides a projection optical machine, including the above-mentioned liquid crystal screen frame.

[0022] According to another aspect of the present application, the present application also provides a projector, including the above-mentioned projection optical engine.

[0023] The above-mentioned LCD screen frame is provided with a plurality of convex grooves on the inner side wall of the frame body, which are arranged at intervals along the first direction and extend along the second direction. By utilizing the grooves extending along the second direction defined between two adjacent convex grooves, the stray light emitted by the LCD screen and incident on the inner side wall of the frame body can be blocked by the grooves and reflected multiple times in the grooves and then attenuated, so that this part of the stray light will no longer enter the subsequent optical system, thereby avoiding this part of the light affecting the imaging quality. That is, the LCD screen frame of the present application can reduce the stray light spots at the edge of the effective picture finally formed by the projection optical machine, thereby improving the imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 is a front view of a liquid crystal screen frame.

[0025] FIG. 2 is a schematic diagram of the structure in which a liquid crystal screen is arranged on a liquid crystal screen frame.

[0026] FIG. 3 is a schematic diagram showing the structure of the convex pattern on one of the two side frame plates of the liquid crystal screen frame.

[0027] FIG. 4 is a schematic structural diagram of the convex pattern on the other of the two side frame plates.

[0028] FIG. 5 is a front view of the convex pattern on the side frame plate shown in FIG. 4 .

[0029] FIG. 6 is an enlarged view of point A in FIG. 1 .

[0030] FIG. 7 is an enlarged view of point B shown in FIG. 5 .

[0031] FIG. 8 is a bottom view of the LCD screen frame.

[0032] FIG. 9 is a schematic diagram of the structure in which the first Fresnel lens is arranged on the liquid crystal screen frame.

[0033] Description of Figure Numbers:

[0034] 10. LCD screen frame;

[0035] 100, frame body; 110, side frame plate; 111, first side support portion; 112, second side support portion; 113, first stopper; 114, second stopper; 115, convex pattern; 120, bottom frame plate; 121, vent; 130, top frame plate; 131, first top surface support portion; 132, second top surface support portion; 140, mounting cavity;

[0036] 200, LCD screen; 300, first Fresnel lens;

[0037] F1, first direction; F2, second direction. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0039] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0044] In the optical system of the projection light machine, a screen frame is required to support and install the LCD screen 200. From the perspective of the support stability of the LCD screen 200, the ineffective supporting area on the stably fixed LCD screen 200 is relatively small, that is, most of the surroundings of the LCD screen 200 with better fixed stability are supported on the screen frame, and the ineffective supporting area is small. The light emitted from the LCD screen 200 has a certain divergence angle. At this time, some stray light will hit the inner wall of the screen frame, and then reflect and enter the optical element behind. This part of the light will eventually form a stray light spot on the image screen, affecting the image quality.

[0045] The present application provides a liquid crystal screen frame 10, which can weaken the reflection of the light emitted from the liquid crystal screen 200 and irradiated onto the inner wall of the screen frame, thereby reducing the stray light spots on the final imaging picture and improving the imaging quality.

[0046] 1 and 2 , the LCD screen frame 10 provided in the present application includes a frame body 100 , the frame body 100 has an installation cavity 140 for installing a LCD screen 200 , and the LCD screen 200 is disposed in the installation cavity 140 and installed on the frame body 100 .

[0047] Referring to Figures 3, 4 and 5, a convex pattern group is provided on the inner side wall of the installation cavity 140, and the convex pattern group includes a plurality of convex patterns 115 arranged at intervals along the first direction F1. Referring to Figures 6 and 7, a groove extending along the second direction F2 is defined between two adjacent convex patterns 115, wherein the first direction F1 and the second direction F2 intersect with each other.

[0048] It can be understood that, referring to FIG. 8 , FIG. 8 shows the optical path of light irradiating to the liquid crystal screen 200 arranged on the liquid crystal screen frame 10 when no convex pattern group is arranged on the inner side wall. It can be seen that the stray light will enter the subsequent optical components through the reflection of the inner side wall, affecting the imaging quality. After the convex pattern group is arranged, the stray light irradiated to the inner side wall of the screen frame will irradiate the convex pattern group, and the raised part of the convex pattern 115 will reflect light, and the groove part formed between the convex patterns 115 will hardly reflect light. After the light is incident on the groove, it will be reflected by the side wall of the groove for many times, weakening the light energy or even until the part of the light disappears, which can greatly reduce the stray light reflected from the inner side wall of the installation cavity 140. In other words, the reflection surface of the convex pattern group only has the top part area of ​​the stripe protrusion. Compared with the inner side wall in a flat state, the reflection surface area of ​​the convex pattern group is greatly reduced, and the corresponding reflected stray light will also be greatly reduced.

[0049] In some embodiments, the second direction F2 is parallel to the axial direction of the installation cavity 140, that is, the convex pattern 115 extends along the axial direction of the installation cavity 140, and the grooves between two adjacent convex patterns 115 also extend along the second direction F2, so that the light entering the groove can be repeatedly reflected in the groove with a sufficiently long channel, gradually weakening the energy until it disappears. In some embodiments, the extension direction of the convex pattern 115 is not too restricted.

[0050] 3 and 4, the frame body 100 includes two side frame plates 110 that are opposite and spaced apart along the third direction, the mounting cavity 140 is formed between the two side frame plates 110, and the inner side walls of the two side frame plates 110 are provided with a convex pattern group, so that the stray light emitted from both sides of the liquid crystal screen 200 can be weakened and the formation of stray light spots can be reduced. Among them, the first direction F1, the second direction F2 and the third direction intersect each other.

[0051] In some embodiments, as shown in FIG. 5 , the spacing between two adjacent convex patterns 115 along the first direction F1 is the same, that is, the multiple stripes in the stripe group are evenly arranged, which can improve the stability of the grooves between two adjacent stripes to repeated reflection of stray light, improve the effect of weakening stray light, and improve imaging quality.

[0052] In some embodiments, the distance x between two adjacent convex patterns 115 satisfies the following relationship: 0<x≤1mm. It can be understood that the multiple stripes of the stripe group can be arranged non-uniformly, and the distance between two adjacent stripes can be less than or equal to 1mm, so that the stripe group can play an effect of weakening stray light. In some embodiments, the distance between two adjacent stripes can be set to 0.1mm, 0.15mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, 0.9mm, etc.

[0053] In some embodiments, as shown in FIG. 7 , the groove is concave outward in an arc shape, or in other words, the cross section of the convex pattern 115 is arc-shaped, so that the side wall of the groove is arc-shaped.

[0054] In some embodiments, the convex 115 includes two convex 115 parts connected at one end and arranged at an angle, and the groove is formed between two adjacent convex 115 parts of the adjacent convex 115. That is, the cross section of the convex 115 is triangular, and stray light is irradiated onto the convex 115, repeatedly reflected between two adjacent convex 115 parts of the adjacent two convex 115, and gradually attenuated.

[0055] Referring to FIG. 1 and FIG. 2 , the LCD screen frame 10 further includes a first side support portion 111 disposed on the inner side wall of the installation cavity 140, and a first stopper 113 is further disposed on the side frame plate 110. Along the axial direction of the installation cavity 140, the first stopper 113 and the first side support portion 111 are arranged opposite and spaced apart to limit the LCD screen 200 between the first stopper 113 and the first side support portion 111, so as to achieve the installation and fixation of the LCD screen 200. A plurality of first stoppers 113 are provided, and the LCD screen 200 can be limited at multiple positions to improve its limiting and fixing effect. In some embodiments, the first side support portion 111 extends along the first direction F1, and cooperates with the inner side wall to make the LCD screen 200 abut against the first side support portion 111 and the inner side wall, so as to limit the LCD screen 200, improve the fixing stability of the LCD screen 200, and the arrangement of the stripe group can weaken the stray light, so that the stray light will not be more due to the larger supporting area, which will affect the final imaging quality.

[0056] Referring to FIG. 3 and FIG. 9 , the LCD screen frame 10 further includes a second side support portion 112, which is arranged on the inner side wall of the side frame plate 110 at intervals with the first side support portion 111 along the axial direction of the installation cavity 140. The side frame plate 110 is further provided with a second stopper 114, which is arranged opposite to and at intervals with the second side support portion 112 along the axial direction of the installation cavity 140, so as to limit the first Fresnel lens 300 between the second stopper 114 and the second side support portion 112. It can be understood that the LCD screen frame 10 of the present application is used to simultaneously install the LCD screen 200 and the first Fresnel lens 300, and the light emitted by the LCD screen 200 is transmitted to the first Fresnel lens 300 and then to other optical components for imaging. The stray light emitted by the LCD screen 200 is irradiated on the inner side wall, and the stray light is attenuated by the stripe group and then transmitted to the first Fresnel lens 300, and then to other optical components.

[0057] The first Fresnel lens 300 is used to converge the light emitted from the liquid crystal screen 200 and transmit it to the subsequent optical components.

[0058] The LCD screen frame 10 is equipped with the LCD screen 200 and the first Fresnel lens 300 at the same time, which can improve the assembly accuracy between the LCD screen 200 and the first Fresnel lens 300, so that the resolution of the final image is better. In addition, combined with the arrangement of the stripe group on the inner wall, the stray light entering the first Fresnel lens 300 is greatly weakened, thereby improving the imaging quality of the projection optical machine.

[0059] Referring to FIGS. 1 to 4 and 8 , the frame body 100 further includes a bottom frame plate 120, which is connected between the two side frame plates 110. The bottom frame plate 120 is provided with at least one vent 121, which is arranged at least toward the first Fresnel lens 300. This allows the first Fresnel lens 300 mounted on the LCD screen frame 10 to be well ventilated, thereby preventing the surface from swell due to temperature changes, thereby affecting imaging. In some embodiments, since the LCD screen 200 and the first Fresnel lens 300 are arranged in the mounting cavity 140 of the frame body 100, the LCD screen 200, the first Fresnel lens 300 and the frame body 100 limit a cavity, and the vent 121 is arranged to be connected to the cavity to ventilate the cavity, thereby ventilating the LCD screen 200 and the first Fresnel lens 300 toward the side of the LCD screen 200.

[0060] The frame body 100 further includes a top frame plate 130, which is connected to the bottom frame plate 120 between the two side frame plates 110 at intervals along the first direction F1. It can be understood that the top frame plate 130, the bottom frame plate 120 and the two side frame plates 110 together define the above-mentioned installation cavity 140 for installing the liquid crystal screen 200. The top frame plate 130 is provided with a first top surface support portion 131 adjacent to the first side surface support portion 111. The first top surface support portion 131 is used to abut against and limit the liquid crystal screen 200 to improve the fixing stability of the liquid crystal screen 200. In some embodiments, the first top surface support portion 131 and the first side surface support portion 111 are connected to abut against the liquid crystal screen 200 together to limit the liquid crystal screen 200.

[0061] In some embodiments, the top frame plate 130 is further provided with a second top surface supporting portion 132 adjacent to the second side surface supporting portion 112 , and the second top surface supporting portion 132 is used to abut against and limit the first Fresnel lens 300 to improve the fixing stability of the first Fresnel lens 300 .

[0062] The present application also provides a projection optical machine, including the above-mentioned LCD screen frame 10. In one embodiment, the projection optical machine also includes a light source, and a focusing rod, a second Fresnel lens, a heat-insulating glass, a LCD screen 200, a first Fresnel lens 300 and a lens arranged in sequence along the propagation direction of the light beam emitted by the light source to form a projector that magnifies the image through projection. The LCD screen 200 controls the amount of light of different colors to pass according to the input signal to achieve the desired image, and the light emitted by the LCD screen 200 is then transmitted to the lens after passing through the first Fresnel lens 300 to obtain the desired image.

[0063] The present application also provides a projector, comprising the above-mentioned projection optical machine.

[0064] The LCD screen frame 10 of the present application defines a groove between two adjacent convex grooves 115 on the inner wall of the frame body 100, so that most of the stray light irradiated to the inner wall is reflected back and forth in the groove and gradually weakened, and a small part is directly reflected onto the first Fresnel lens 300 through the raised part of the convex groove 115, which relatively weakens the reflection of the stray light, reduces the stray light spots on the final imaging picture, and improves the imaging quality.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A liquid crystal screen frame, characterized in that: The LCD screen frame comprises: A frame body, wherein the frame body has a mounting cavity for mounting a liquid crystal screen; Wherein, a convex pattern group is provided on the inner side wall of the installation cavity, and the convex pattern group includes a plurality of convex patterns arranged at intervals along the first direction, and a groove extending along the second direction is defined between two adjacent convex patterns; The second direction is parallel to the axial direction of the installation cavity, and the first direction and the second direction intersect each other.

2. The LCD screen frame according to claim 1, characterized in that: The frame body comprises two side frame plates which are arranged opposite to each other and spaced apart along a third direction, and the mounting cavity is formed between the two side frame plates; The inner side walls of the two side frame plates are both provided with the convex pattern group; The first direction, the second direction and the third direction intersect each other.

3. The LCD screen frame according to claim 1, characterized in that: The distances between two adjacent convex patterns along the first direction are the same.

4. The LCD screen frame according to claim 1, characterized in that: The distance between two adjacent convex patterns along the first direction is x, and x satisfies the following relationship: 0<x≤1mm.

5. The LCD screen frame according to claim 1, characterized in that: The groove is arranged to be concave outward in an arc shape; and / or The convex pattern includes two convex pattern portions which are connected at one end and arranged at an angle, and the groove is formed between two adjacent convex pattern portions in the adjacent convex patterns.

6. The LCD screen frame according to claim 1, characterized in that: The LCD screen frame also includes a first side support portion provided on the inner side wall of the installation cavity; The frame body includes a side frame plate, and a first limiting member is also provided on the side frame plate. Along the axial direction of the installation cavity, the first limiting member is opposite to and spaced from the first side support portion to limit the LCD screen between the first limiting member and the first side support portion.

7. The LCD screen frame according to claim 6, characterized in that: The LCD screen frame further includes a second side support portion, which is arranged on the inner side wall of the side frame plate at intervals from the first side support portion along the axial direction of the installation cavity; A second limiting member is also provided on the side frame plate. Along the axial direction of the mounting cavity, the second limiting member is opposite to and spaced from the second side support portion so as to limit the first Fresnel lens between the second limiting member and the second side support portion.

8. The LCD screen frame according to claim 7, characterized in that: The frame body further comprises a bottom frame plate, wherein the bottom frame plate is connected between the two side frame plates, and at least one vent is formed on the bottom frame plate, wherein the vent is at least arranged toward the first Fresnel lens.

9. A projection optical machine, characterized in that: It comprises a liquid crystal screen frame as described in any one of claims 1-8.

10. A projector, characterized in that: Comprising a projection light machine as claimed in claim 9.

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