CN219370188U - DMD shading sheet - Google Patents

Abstract

The utility model relates to a DMD (digital micromirror device) shading sheet, which comprises a main board and a light hole arranged in the main board, wherein a continuous and sealed shading sheet wall is arranged on the extension edge of the light hole. Through setting up the anti-dazzling screen wall, the structural design of shading prevents useless stray light and gets into the DMD, can prevent like this that the DMD from projecting the stray light on the screen to greatly reduced the severity of light leak makes black picture seem more true, the film effect is better, has improved the competitiveness of projecting apparatus.

Description

DMD shading sheet

Technical Field

The utility model relates to the technical field of projectors, in particular to a DMD shading sheet.

Background

Light leakage of the existing high-brightness projector is a bottleneck in the industry, and the problem or severity or slight light leakage of the high-brightness projector can be caused under a very black picture. The light leakage is due to a number of factors, one of which is the shading of the DMD. Light leakage can be poor in feeling when a user uses the projector, and particularly when the user looks at a black picture, the effect of an original image can be lost.

The light shielding sheet of the DMD in the prior art is a plane, so that part of stray light can be shielded, and the light leakage problem can be slightly reduced. Along with the continuous improvement of brightness, more and more stray light is generated due to the fact that the original DMD shading sheet cannot shade, and the severity of light leakage is also increased. In addition, the existing DMD shading sheet is a sheet, and can emit heat while absorbing stray light, and the sheet is deformed due to uneven heating, so that the best shading effect is not beneficial to maintaining.

Disclosure of Invention

The utility model aims to provide a DMD shading sheet, which solves the problems in the prior art.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a DMD shading sheet comprises a main board and a light hole formed in the main board, wherein a continuous and sealed shading sheet wall is arranged on the extending edge of the light hole.

In the above scheme, the light shielding plate wall is of a rectangular frame-shaped structure with round corners and is perpendicular to the plane of the main board.

Further, the light shielding plate wall is arranged at one side close to the prism; or the light shielding sheet wall is arranged on one side close to the DMD. Or the light shielding sheet walls are arranged on two sides of the extending edge of the light hole of the wall.

In the above scheme, the outside of mainboard is equipped with mounting hole and constant head tank.

In the scheme, black baking varnish is arranged on the surface of the main board.

In addition, the light source further comprises a DMD, wherein a DMD reflecting area is formed in the DMD, and the specification size of the light transmitting hole is larger than or equal to that of the DMD reflecting area.

Compared with the prior art, the utility model has the beneficial effects that: the continuous and sealed light shielding sheet wall is welded on the extension edge of the light hole, so that external stray light is effectively blocked outside the DMD reflecting surface in terms of light absorption; in terms of strength, the anti-dazzling screen wall is used as a supporting surface, so that the overall strength is better; on the heat dissipation, the contact area of the shading sheet wall and the outside is larger, and the heat dissipation effect is better. The shading structure is designed to prevent useless stray light from entering the DMD, so that the DMD can be prevented from projecting the stray light onto a screen, the severity of light leakage is greatly reduced, a black picture looks more real, a film effect is better, and the competitiveness of a projector is improved.

Drawings

The disclosure of the present utility model is described with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the utility model. In the drawings, like reference numerals are used to refer to like parts. Wherein:

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic side view of the present utility model;

FIG. 3 is a schematic view of the structure of the present utility model in embodiment 1;

FIG. 4 is a schematic side view of the structure of the present utility model in embodiment 2;

FIG. 5 is a schematic side view of the structure of the present utility model in embodiment 3;

fig. 6 is a plan view structural diagram of the DMD in embodiment 4 of the present utility model;

fig. 7 is a structural diagram of a combination of a DMD and a DMD mask in embodiment 4 of the present utility model;

fig. 8 is a schematic structural view of the present utility model in practice.

Reference numerals in the drawings: 1-prism, 1-1-prism upper plane, 1-2-prism lens face, 1-3-prism lower plane, 2-shading sheet body, 2-1-mainboard, 2-2-light hole, 2-3-first shading sheet wall, 2-4-second shading sheet wall, 3-DMD, 3-1-DMD reflection area.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the present utility model easy to understand, the present utility model will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic representations which merely illustrate the basic structure of the utility model and therefore show only the structures to which the utility model pertains.

According to the technical scheme of the utility model, a person skilled in the art can propose various alternative structural modes and implementation modes without changing the true spirit of the utility model. Accordingly, the following detailed description and drawings are merely illustrative of the utility model and are not intended to be exhaustive or to limit the utility model to the precise form disclosed.

The technical scheme of the utility model is further described in detail below with reference to the accompanying drawings and examples.

Embodiment 1, as shown in fig. 1 to 3, a DMD light shielding sheet comprises a main board 2-1 and a light hole 2-2 formed in the main board 2-1, wherein continuous and sealed light shielding sheet walls are welded on the extending edges of the light hole 2-2 for shielding the light around the light hole 2-2 and preventing stray light from entering the DMD. According to the requirement, the light shielding sheet wall is of a rectangular frame-shaped structure with round corners and is perpendicular to the plane of the main board 2-1, and the light shielding sheet wall also plays a supporting role.

The anti-dazzling screen wall sets up on the epitaxial limit both sides of wall light trap 2-2, through having increased the anti-dazzling screen wall of both sides, and the stray light is difficult to go into, and when absorbing stray light and generating heat, the anti-dazzling screen wall plays the supporting role, and the setting of anti-dazzling screen wall has increased heat radiating area, prevents that mainboard 2-1 from warping, consequently, its intensity and radiating effect are better.

As a preferable scheme, the outside of the main board 2-1 is provided with mounting holes and positioning grooves, the mounting holes are arranged on two sides and are used for being fixed with the DMD3, and the positioning grooves are semicircular grooves and used for positioning. In addition, the surface of the main board 2-1 is provided with black baking varnish, so that a part of stray light can be absorbed.

In general, by welding a continuous and sealed light shielding sheet wall on the extension edge of the light transmission hole 2-2, external stray light is effectively blocked outside the DMD reflecting surface 3-1 in terms of light absorption; in terms of strength, the anti-dazzling screen wall is used as a supporting surface, so that the overall strength is better; on the heat dissipation, the contact area of the shading sheet wall and the outside is larger, and the heat dissipation effect is better.

Example 2, please refer to fig. 4, differs from example 1 in that: the light shielding plate wall is arranged at one side close to the prism 1, namely the first light shielding plate wall 2-3. The scheme completely blocks the space between the shading sheet body 2 and the lower plane 1-3 of the prism, so that external stray light can not enter the DMD reflecting area from the area.

Example 3, please refer to fig. 5, differs from example 1 in that: the light shielding plate wall is arranged at one side close to the DMD3, namely the second light shielding plate wall 2-4. The scheme completely blocks the space between the anti-dazzling screen body 2 and the DMD3, so that external stray light can not enter the DMD reflecting area from the area.

Embodiment 4 referring to fig. 6 and 7, a DMD light shielding sheet includes a DMD3 in addition to a light shielding sheet body 2. The light shielding sheet body 2 comprises a main board 2-1 and a light transmitting hole 2-2 formed in the main board 2-1, and the DMD3 is provided with a DMD reflecting area 3-1, wherein the specification size of the light transmitting hole 2-2 is larger than or equal to that of the DMD reflecting area 3-1. The size of the light hole 2-2 is large, that is, the size of the light shielding plate wall is also large, the specification size of the light shielding plate wall is larger than or equal to the specification size of the DMD reflection area 3-1, and the whole DMD reflection area 3-1 is wrapped for good light shielding.

In connection with embodiments 1 through 4, the present utility model is implemented with reference to fig. 8.

The working process comprises the following steps: normal light enters from the prism lens surface 1-2 at a certain angle and passes through the prism lower plane 1-3 and the light transmission hole 2-2 to the DMD reflection area 3-1, the DMD3 reflects the received light out through the DMD reflection area 3-1, passes through the prism lower plane 1-3 and the prism upper plane 1-1 and enters the lens to form a picture. In this process, stray light with different directions enters the DMD reflective region 3-1, and the DMD3 reflects received light out through the DMD reflective region 3-1, passes through the prism lower plane 1-3 and the prism upper plane 1-1, and enters the lens to form a picture, wherein the picture is light color or light leakage in a region which is not to be displayed. The main board 2-1, the first light shielding sheet wall 2-3 and the second light shielding sheet wall 2-4 on the light shielding sheet body 2 simultaneously shield external stray light outside the DMD reflection area 3-1, so that the risk of light leakage is reduced. The main board 2-1 of the light shielding sheet body 2, the first light shielding sheet wall 2-3 and the second light shielding sheet wall 2-4 form a whole with better strength. Heating is carried out under the action of absorbing stray light, so that the deformation of the main board 2-1 can be greatly reduced, and the existing action is kept.

In the utility model, the shading structure is designed to prevent useless stray light from entering the DMD3, so that the DMD3 can be prevented from projecting the stray light onto a screen, thereby greatly reducing the severity of light leakage, enabling a black picture to look more real, having better film effect and improving the competitiveness of a projector.

The scheme isolates all the outside of the DMD reflective area 3-1. In other words: the light leakage effect is better, so that the performance requirement of a later-stage high-end product in the industry can be met. The utility model can be applied to the laser fields of laser projectors, stage lamps, special illumination and the like.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. These undisclosed elements are all of the prior art known to those skilled in the art.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims (7)

1. The utility model provides a DMD anti-dazzle screen, includes mainboard (2-1) and sets up light trap (2-2) in mainboard (2-1), its characterized in that: the light shielding plate is characterized in that a continuous and sealed light shielding plate wall is arranged on the extending edge of the light hole (2-2), is of a rectangular frame-shaped structure with a round angle and is perpendicular to the plane of the main board (2-1).

2. The DMD light shield as recited in claim 1 wherein: the shading sheet wall is arranged on one side close to the prism (1).

3. The DMD light shield as recited in claim 1 wherein: the light shielding sheet wall is arranged on one side close to the DMD (3).

4. The DMD light shield as recited in claim 1 wherein: the light shielding sheet walls are arranged on two sides of the extending edge of the wall light holes (2-2).

5. The DMD light shield as recited in claim 1 wherein: and the outer side of the main board (2-1) is provided with a mounting hole and a positioning groove.

6. The DMD light shield as recited in claim 1 wherein: still include DMD (3), DMD reflection area (3-1) has been seted up in DMD (3), its characterized in that: the specification size of the light transmission hole (2-2) is larger than or equal to that of the DMD reflection area (3-1).

7. The DMD light shield as recited in claim 1 wherein: the surface of the main board (2-1) is provided with black baking varnish.