CN220913491U - Monolithic liquid crystal projector optical machine and liquid crystal projector - Google Patents

Abstract

The utility model relates to a single-chip liquid crystal projector optical machine and a liquid crystal projector. The single-chip liquid crystal projector comprises: the light source, the light cone, the first Fresnel lens, the liquid crystal light valve, the second Fresnel lens and the lens are sequentially arranged according to the light travelling direction; wherein, the length x and the width y of the light emitting surface of the light source satisfy: x is more than or equal to 14mm and less than or equal to 18mm; y is more than or equal to 10mm and less than 14mm; the length a and the width b of the light incident side end face of the light cone satisfy the following conditions: a is more than or equal to x; b is more than or equal to y; the length c and the width d of the light emitting side end face of the light cone and the length e and the width f of the display area of the liquid crystal light valve satisfy the following conditions: c is more than or equal to e; d is more than or equal to f; the height h of the light cone satisfies: h is more than or equal to 54mm and less than or equal to 64mm; the focal length f1 of the first fresnel lens satisfies: f1 is more than or equal to 70mm and less than or equal to 85mm. The liquid crystal projector has higher brightness, better brightness uniformity and smaller space occupation.

Description

Monolithic liquid crystal projector optical machine and liquid crystal projector

Technical Field

The present utility model relates to a projector, and more particularly to a single-chip liquid crystal projector and a liquid crystal projector.

Background

A projector, also known as a projector, is a device that projects images or video onto a curtain. The single-chip liquid crystal projector is a type of projector, which is matched with other principles, has the advantages of low price, simple manufacture, small volume and light weight, is very convenient to carry, and is one of the main stream products in the projector market at present. The light machine of the monolithic liquid crystal projector comprises a light source, a light cone, a front Fresnel lens, a liquid crystal screen, a rear Fresnel lens, a lens and other components, wherein light emitted by the light source is condensed by the light cone and then irradiates the Fresnel lens, then irradiates the liquid crystal screen, the liquid crystal screen displays images and then converges by the rear Fresnel lens, and a picture is projected on a curtain through the lens. In general, the optical machine of the monolithic liquid crystal projector has a light source with a smaller area and an illumination surface with a larger area, which increases the design difficulty, and in practical design, the display brightness cannot be considered due to the need of reducing the size of the whole machine, which causes the problem that the optical machine of the monolithic liquid crystal projector in the related art has lower display brightness, which also causes poor display effect.

Disclosure of utility model

Accordingly, there is a need to provide a monolithic liquid crystal projector with small size, high display brightness and good display effect, and a liquid crystal projector.

A first aspect of an embodiment of the present application provides a monolithic liquid crystal projector, including: the light source, the light cone, the first Fresnel lens, the liquid crystal light valve, the second Fresnel lens and the lens are sequentially arranged according to the light travelling direction;

Wherein, the length x and the width y of the light emitting surface of the light source satisfy: x is more than or equal to 14mm and less than or equal to 18mm; y is more than or equal to 10mm and less than 14mm;

the length a and the width b of the light incident side end face of the light cone satisfy the following conditions: a is more than or equal to x; b is more than or equal to y;

The length c and the width d of the light emitting side end face of the light cone and the length e and the width f of the display area of the liquid crystal light valve satisfy the following conditions: c is more than or equal to e; d is more than or equal to f;

The height h of the light cone satisfies: h is more than or equal to 54mm and less than or equal to 64mm;

the focal length f1 of the first fresnel lens satisfies: f1 is more than or equal to 70mm and less than or equal to 85mm.

In one embodiment, the length a and width b of the light-entry side end face of the light cone satisfy: x mm is less than or equal to a and less than or equal to (x+1.5) mm; y mm is less than or equal to b is less than or equal to (y+1.5) mm;

The length c and the width d of the light-emitting side end face of the light cone satisfy the following conditions: c is more than or equal to 110mm and less than or equal to 114mm; d is more than or equal to 62mm and less than or equal to 68mm.

In one embodiment, the focal length f2 of the second fresnel lens satisfies: f2 is not less than 120mm and not more than 145mm.

In one embodiment, the first fresnel lens and the second fresnel lens have the same size, and the length D3 and the width D4 of the first fresnel lens and the length c and the width D of the light-emitting side end face of the light cone satisfy: c mm is less than or equal to D3 and less than or equal to (c+5) mm; d mm is less than or equal to D4 and less than or equal to (d+5) mm.

In one embodiment, the light emitting surface of the light source is perpendicular to the horizontal plane, and the optical axis of the light cone is parallel to the horizontal plane.

In one embodiment, the monolithic liquid crystal projector further comprises a reflector, and the reflector is arranged on the optical path between the second Fresnel lens and the lens; the plane of the reflector and the plane of the second Fresnel lens are obliquely arranged.

In one embodiment, the angle α of the optical axis of the lens with respect to the horizontal plane satisfies: alpha is more than or equal to-5 degrees and less than or equal to 5 degrees.

In one embodiment, the light emitting surface of the light source, the light incident side end surface and the light emitting side end surface of the light cone, the first fresnel lens, the liquid crystal light valve and the second fresnel lens are arranged in parallel;

The optical axis of the second Fresnel lens is perpendicular to the optical axis of the lens;

The light source is an LED light source.

In one embodiment, along the light traveling direction, the distance D1 from the light emitting surface of the light source to the light entering surface of the lens is as follows: d1 is more than or equal to 200mm and less than or equal to 220mm;

The reflecting surface length D2 of the reflector meets the following conditions: and D2 is more than or equal to 110mm and less than or equal to 125mm, wherein the length of the reflecting surface is the projection length of the reflecting surface of the reflector on the horizontal plane.

A second aspect of the embodiments of the present application provides a liquid crystal projector, including the above-mentioned monolithic liquid crystal projector.

The single-chip liquid crystal projector has the beneficial effects that:

The length x and width y of the light-emitting surface passing through the light source satisfy: x is more than or equal to 14mm and less than or equal to 18mm, y is more than or equal to 10mm and less than 14mm, and the length a and the width b of the light incident side end face of the light cone satisfy the following conditions: a is larger than or equal to x, and b is larger than or equal to y, so that all light emitted by the light emitting surface of the light source can enter the light cone from the light incident side end surface of the light cone. The length c and width d of the light-emitting side end face of the light cone and the length e and width f of the display area of the liquid crystal light valve satisfy: c is larger than or equal to e, d is larger than or equal to f, namely the size of the liquid crystal light valve is smaller than or equal to the size of the light emitting side end face of the light cone, so that the liquid crystal light valve is entirely exposed in the light rays of the light emitting side of the light cone, and the imaging brightness is higher and the uniformity is better. Further, the height h of the light cone satisfies: h is more than or equal to 54mm and less than or equal to 64mm; the focal length f1 of the first fresnel lens satisfies: by setting the parameters as above, the brightness of the single-chip liquid crystal projector is higher, the brightness uniformity is better, and the space occupation is smaller.

Drawings

FIG. 1 is a schematic diagram of a monolithic liquid crystal projector according to an embodiment of the present application;

Fig. 2 is a schematic diagram of a light cone structure in a monolithic liquid crystal projector according to an embodiment of the present application;

FIG. 3 is a top view of a light cone in a monolithic liquid crystal projector according to an embodiment of the present application;

fig. 4 is a top view of a first fresnel lens in a monolithic liquid crystal projector according to an embodiment of the present application;

FIG. 5 is a top view of a light source in a single-chip liquid crystal projector according to an embodiment of the present application;

Fig. 6 is a schematic diagram of energy distribution on a liquid crystal light valve of a single-chip liquid crystal projector according to an embodiment of the present application.

Reference numerals illustrate:

100. A monolithic liquid crystal projector;

10. A light source; 20. a light cone; 30. a first fresnel lens; 40. a liquid crystal light valve; 50. a second fresnel lens; 60. a lens; 70. a reflective mirror.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

The following describes a monolithic liquid crystal projector and a liquid crystal projector according to an embodiment of the present application with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a monolithic liquid crystal projector according to an embodiment of the present application; fig. 2 is a schematic diagram of a light cone structure in a monolithic liquid crystal projector according to an embodiment of the present application; FIG. 3 is a top view of a light cone in a monolithic liquid crystal projector according to an embodiment of the present application; fig. 4 is a top view of a first fresnel lens in a monolithic liquid crystal projector according to an embodiment of the present application; FIG. 5 is a top view of a light source in a single-chip liquid crystal projector according to an embodiment of the present application; fig. 6 is a schematic diagram of energy distribution on a liquid crystal light valve of a single-chip liquid crystal projector according to an embodiment of the present application.

Referring to fig. 1, a first aspect of an embodiment of the present application provides a monolithic liquid crystal projector 100, including: the light source 10, the light cone 20, the first fresnel lens 30, the liquid crystal light valve 40, the second fresnel lens 50 and the lens 60 are sequentially arranged according to the light traveling direction, wherein the light cone 20 is a quadrangular frustum with a small diameter end facing the light source 10, that is, the light incident side end surface of the light cone 20 is smaller than the light emergent side end surface of the light cone 20.

In fig. 1, 2, 3, and 5, the length x and width y of the light emitting surface (for example, may be rectangular) of the light source 10 satisfy: x is more than or equal to 14mm and less than or equal to 18mm, y is more than or equal to 10mm and less than 14mm. The length a and width b of the light-entering side end face of the light cone 20 satisfy: a is greater than or equal to x, and b is greater than or equal to y. The length c and width d of the light-emitting side end face of the light cone 20 and the length e and width f of the display area of the liquid crystal light valve 40 satisfy: c is greater than or equal to e, and d is greater than or equal to f. The height h of the light cone 20 satisfies: h is more than or equal to 54mm and less than or equal to 64mm. The focal length f1 of the first fresnel lens 30 satisfies: f1 is more than or equal to 70mm and less than or equal to 85mm.

The length x and width y of the light exit surface through the light source 10 satisfy: x is more than or equal to 14mm and less than or equal to 18mm, y is more than or equal to 10mm and less than 14mm, and the length a and the width b of the light incident side end face of the light cone 20 satisfy the following conditions: a is equal to or greater than x, and b is equal to or greater than y, so that all light emitted from the light-emitting surface of the light source 10 can enter the light cone 20 from the light-entering side end surface of the light cone 20. The length c and width d of the light-emitting side end surface of the light cone 20 and the length e and width f of the display area of the liquid crystal light valve 40 satisfy: c is larger than or equal to e, d is larger than or equal to f, namely, the size of the display area (AA area, approximately rectangular) of the liquid crystal light valve 40 is smaller than or equal to the size of the light emitting side end face of the light cone 20, so that the whole display area of the liquid crystal light valve 40 is exposed in the light of the light emitting side of the light cone 20, and the imaging brightness is higher and the uniformity is better. Further, the height h of the light cone 20 satisfies: h is more than or equal to 54mm and less than or equal to 64mm; the focal length f1 of the first fresnel lens 30 satisfies: through the setting of the parameters, the brightness of the single-chip liquid crystal projector 100 is higher, the brightness uniformity is better, and the space occupation is smaller.

In the embodiment of the present application, the light emitting surface of the light source 10 is perpendicular to the horizontal plane, and the optical axis of the light cone 20 is parallel to the horizontal plane. In other words, the optical axis of the light between the light source 10 and the reflector 70 is parallel to the horizontal plane, that is, the single-chip liquid crystal projector 100 is a horizontal projector, and the horizontal projector can reserve a larger heat dissipation space, so as to solve the problems of low display brightness, poor color uniformity, and the like.

Further, the monolithic liquid crystal projector may further include a mirror 70, and the mirror 70 is disposed on an optical path between the second fresnel lens 50 and the lens 60. The plane of the reflective mirror 70 is disposed obliquely to the plane of the second fresnel lens 50. Such as a 45 deg. angled design.

Specifically, the reflector 70 is configured to reflect the first light beam to the lens 60, where the first light beam is emitted from the light source 10 after passing through the light cone 20, the first fresnel lens 30, the liquid crystal light valve 40, and the second fresnel lens 50. The light source 10, the light cone 20, the first fresnel lens 30, the liquid crystal light valve 40, the second fresnel lens 50, and the lens 60 are sequentially disposed according to the light traveling direction, as shown by solid arrows in fig. 1, and along the light traveling direction, the light cone 20 is located at the front side of the light source 10, the first fresnel lens 30 is located at the front side of the light cone 20, the liquid crystal light valve 40 is located at the front side of the first fresnel lens 30, the second fresnel lens 50 is located at the front side of the liquid crystal light valve 40, and the lens 60 is located at the front side of the second fresnel lens 50. Illustratively, the light source 10 is an LED light source, and the center of the light emitting surface of the light source 10, the optical axis of the light cone 20, the center of the first fresnel lens 30, the center of the liquid crystal light valve 40, and the center of the second fresnel lens 50 are coaxially disposed. Further, the light emitting surface of the light source 10, the light incident side end surface and the light emitting side end surface of the light cone 20, the first fresnel lens 30, the liquid crystal light valve 40 and the second fresnel lens 50 are arranged in parallel, the optical axis of the second fresnel lens is perpendicular to the optical axis of the lens 60, and the reflective mirror 70 and the second fresnel lens 50 have a preset included angle.

In the embodiment of the present application, the length a and the width b of the light incident side end face of the light cone 20 satisfy: x mm is less than or equal to a and less than or equal to (x+1.5) mm, y mm is less than or equal to b and less than or equal to (y+1.5) mm. As described above, the size of the light-incident side end surface of the light cone 20 needs to be equal to or slightly larger than the size of the light-emitting surface of the light source 10 to ensure that all light emitted from the light-emitting surface of the light source 10 enters the light cone 20 from the light-incident side end surface of the light cone 20, and on the other hand, if the difference between the size of the light-incident side end surface of the light cone 20 and the size of the light-incident surface of the light source 10 is greater than 1.5mm, the brightness is reduced, and the size of the light cone 20 is increased, which is not beneficial to miniaturization of the whole volume. Therefore, by making x mm.ltoreq.a.ltoreq.x+1.5 mm and y mm.ltoreq.b.ltoreq.y+1.5 mm, not only the volume can be reduced but also the luminance can be made higher.

Further, the length c and width d of the light-emitting side end face of the light cone 20 satisfy: c is more than or equal to 110mm and less than or equal to 114mm, d is more than or equal to 62mm and less than or equal to 68mm. In the embodiment of the present application, the size of the light emitting side end face of the light cone 20 may be selected according to the size of the liquid crystal light valve 40, as described above, the size of the liquid crystal light valve 40 is smaller than or equal to the size of the light emitting side end face of the light cone 20, so that the liquid crystal light valve 40 is entirely exposed in the light of the light emitting side of the light cone 20, and on the other hand, if the size of the light emitting side end face of the light cone 20 is too large, the brightness is low. And the imaging brightness is higher and the uniformity is better by enabling the c of 110mm to be less than or equal to 114mm and the d of 62mm to be less than or equal to 68mm.

In the embodiment of the present application, further, the focal length f2 of the second fresnel lens 50 satisfies: the size of f1 is not smaller than 70mm and not larger than 85mm, and f2 is not smaller than 120mm and not larger than 145mm, and the size of f1 of the first Fresnel lens 30 is not smaller than 70mm, so that the brightness of the single-chip liquid crystal projector 100 is higher and more uniform.

Further, with continued reference to fig. 1, along the light traveling direction, the distance D1 (i.e., d1+d2) from the light exit surface of the light source 10 to the light entrance surface of the lens 60 satisfies: d1 is more than or equal to 200mm and less than or equal to 220mm. Here, for convenience of illustration, the distance D1 is represented by the lengths d1+d2 of the two self-path segments.

The reflection surface length D2 of the mirror 70 satisfies: 110mm < D2 > 125mm, wherein the length of the reflecting surface is the length of the projection of the reflecting surface of the reflector 70 on the horizontal plane.

When D1 is less than 200mm or greater than 220mm, the brightness of the single-chip liquid crystal projector 100 is significantly reduced, because the light reflected by the reflector 70 has a light path with a necked-in middle along its propagation path, and when the light satisfies the condition that D1 is less than or equal to 200mm and less than or equal to 220mm, the light incident surface of the lens 60 is located exactly at the necked-in position of the light path, so that the light spot formed on the lens 60 is smaller, and the brightness is higher, in other words, if D1 satisfies the above condition, the lens 60 is actually located in the position range with the smallest formed light spot, thereby improving the brightness.

On the other hand, if the reflecting surface length D2 of the reflecting mirror 70 is smaller than 110mm, the problem of brightness decrease may occur, and if D2 is larger than 125mm, the effect of brightness improvement is not obvious, and an excessively large space is also occupied, which is disadvantageous for volume miniaturization.

In the embodiment of the present application, referring to fig. 1, 3 and 4, the first fresnel lens 30 and the second fresnel lens 50 have the same size, and the length D3 and the width D4 of the first fresnel lens 30 and the length c and the width D of the light emitting side end face of the light cone 20 satisfy: d3 And D4 is more than or equal to D. In this way, the first fresnel lens 30 and the second fresnel lens 50 can fully utilize the light emitted from the light emitting side of the light cone 20.

Further, the length D3 and the width D4 of the first fresnel lens 30 satisfy the length c and the width D of the light-emitting side end face of the light cone 20: c mm is less than or equal to D3 and less than or equal to (c+5) mm, D mm is less than or equal to D4 and less than or equal to (d+5) mm. If the difference between the dimensions of the first fresnel lens 30 and the second fresnel lens 50 and the light-emitting side end surface of the light cone 20 is greater than 5mm, the brightness of the single-chip liquid crystal projector 100 may be reduced.

In the embodiment of the present application, the angle α of the optical axis of the lens 60 with respect to the horizontal plane satisfies-5.ltoreq.α.ltoreq.5 °.

Fig. 6 illustrates a schematic diagram showing the energy distribution on the liquid crystal light valve 40, in which the horizontal axis represents the length dimension (mm) of the liquid crystal light valve 40, the vertical axis represents the light intensity on the liquid crystal light valve 40, and the light intensity at the M point (point located at the edge position in the liquid crystal light valve 40) is approximately 40% of the light intensity at the N point (point located at the center position in the liquid crystal light valve 40) as seen in the figure. As can be seen from this, in the monolithic liquid crystal projector 100 according to the embodiment of the application, the luminance of the monolithic liquid crystal projector 100 is high.

A second aspect of the present application provides a liquid crystal projector, including the above-mentioned monolithic liquid crystal projector 100. The structure, function, working principle, etc. of the single-chip liquid crystal projector 100 have been described in detail in the foregoing, and are not described here again.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A monolithic liquid crystal projector comprising: the light source, the light cone, the first Fresnel lens, the liquid crystal light valve, the second Fresnel lens and the lens are sequentially arranged according to the light travelling direction;

Wherein, the length x and the width y of the light emitting surface of the light source satisfy: x is more than or equal to 14mm and less than or equal to 18mm; y is more than or equal to 10mm and less than 14mm;

The length a and the width b of the light incident side end face of the light cone satisfy the following conditions: a is more than or equal to x; b is more than or equal to y;

The length c and the width d of the light emitting side end face of the light cone and the length e and the width f of the display area of the liquid crystal light valve satisfy the following conditions: c is more than or equal to e; d is more than or equal to f;

the height h of the light cone satisfies: h is more than or equal to 54mm and less than or equal to 64mm;

The focal length f1 of the first fresnel lens satisfies: f1 is more than or equal to 70mm and less than or equal to 85mm.

2. The single-sheet liquid crystal projector as defined in claim 1, wherein the length a and the width b of the light entrance side end face of the light cone satisfy: x mm is less than or equal to a and less than or equal to (x+1.5) mm; y mm is less than or equal to b is less than or equal to (y+1.5) mm;

The length c and the width d of the light emitting side end face of the light cone satisfy the following conditions: c is more than or equal to 110mm and less than or equal to 114mm; d is more than or equal to 62mm and less than or equal to 68mm.

3. The single-piece liquid crystal projector of claim 1, wherein the focal length f2 of the second fresnel lens satisfies: f2 is not less than 120mm and not more than 145mm.

4. The single-chip liquid crystal projector according to claim 1, wherein the first fresnel lens and the second fresnel lens have the same size, and the length D3 and the width D4 of the first fresnel lens and the length c and the width D of the light-emitting side surface of the light cone satisfy: c mm is less than or equal to D3 and less than or equal to (c+5) mm; d mm is less than or equal to D4 and less than or equal to (d+5) mm.

5. The single-chip liquid crystal projector according to any one of claims 1-4, wherein the light emitting surface of the light source is perpendicular to a horizontal plane, and the optical axis of the light cone is parallel to the horizontal plane.

6. The single-piece liquid crystal projector of claim 5, further comprising a mirror disposed in an optical path between the second fresnel lens and the lens; and the plane of the reflector and the plane of the second Fresnel lens are obliquely arranged.

7. The single-chip liquid crystal projector according to claim 6, wherein the angle α between the optical axis of the lens and the horizontal plane satisfies: alpha is more than or equal to-5 degrees and less than or equal to 5 degrees.

8. The single-chip liquid crystal projector according to claim 6, wherein the light-emitting surface of the light source, the light-incident side surface and the light-emitting side surface of the light cone, the first fresnel lens, the liquid crystal light valve, and the second fresnel lens are disposed in parallel;

the optical axis of the second Fresnel lens is perpendicular to the optical axis of the lens;

the light source is an LED light source.

9. The single-chip liquid crystal projector according to claim 8, wherein a distance D1 from the light emitting surface of the light source to the light entering surface of the lens along the light traveling direction is as follows: d1 is more than or equal to 200mm and less than or equal to 220mm;

The reflecting surface length D2 of the reflector meets the following conditions: and D2 is more than or equal to 110mm and less than or equal to 125mm, wherein the length of the reflecting surface is the projection length of the reflecting surface of the reflector on the horizontal plane.

10. A liquid crystal projector comprising a monolithic liquid crystal projector according to any one of claims 1-9.