Miniaturized projection optical engine structure

Abstract

The invention discloses a miniaturized projection optical engine structure, which comprises a light source, a light cup holder above the light source, a honeycomb array lens which is arranged above the light cup holder and clings to the light cup holder, a heat insulation polarization glass group and an LCD (Liquid Crystal Display) display panel, the light source, the light cup holder, the honeycomb type array lens, the heat insulation polarization glass set and the LCD display panel are parallel to one another, geometric center point normal lines coincide, light emitted by the light source passes through the light cup and the lens, local light is collimated and converged, the angle is adjusted, highly-uniform light spots are formed, stray light is eliminated, and the display effect is good. According to the invention, the size of an optical engine in the projector is significantly reduced, and the light uniformity and the native contrast are significantly improved.

Description

Technical Field

[0001] This invention relates to a projection optical engine, and more particularly to a miniaturized projection optical engine structure. Background Technology

[0002] Traditional projection optical engines typically use compound eye lenses or light bars as core homogenizing devices. A compound eye lens consists of a pair of arrayed lenses that achieve uniform illumination by splitting the light emitted from the light source into multiple sub-beams and superimposing them. However, it has the following drawbacks: the system length is relatively long, which is not conducive to the miniaturization of the entire device; there is gap loss during the superposition of sub-beams; there is room for improvement in light energy utilization; and the ability to suppress stray light is limited, which affects the contrast of the final image.

[0003] While light rods achieve uniform light distribution through multiple internal reflections, their relatively compact structure presents several challenges: the length of the light rod is related to the entrance beam aperture and F-number, further reducing its size sacrifices uniformity; internal reflections result in energy loss and stray light issues, hindering contrast improvement. Therefore, current technologies cannot perfectly balance high luminous efficiency, high uniformity, and high contrast within an ultra-small volume. Summary of the Invention

[0004] Purpose of the invention: The purpose of this invention is to provide a miniaturized projection optical engine structure that is small in size and has high luminous efficiency, high uniformity and high contrast.

[0005] Technical solution: The miniaturized projection optical engine structure of the present invention includes a light source, a light cup holder above the light source, a honeycomb array lens attached to the light cup holder above the light cup holder, a heat-insulating polarizing glass group, and an LCD display panel. The light source, light cup holder, honeycomb array lens, heat-insulating polarizing glass group, and LCD display panel are all parallel to each other and their geometric center point normals coincide.

[0006] Preferably, the light source is an LED white light source.

[0007] Preferably, the honeycomb array lens is composed of a plurality of small hexagonal lenses arranged in a seamless, densely packed manner.

[0008] Preferably, the light cup holder is composed of a plurality of regular hexagonal light cups arranged in the densest possible order.

[0009] Preferably, each hexagonal light cup corresponds to the position of each hexagonal microlens on the honeycomb array lens, and their axes coincide.

[0010] Preferably, the light cup holder is an aluminum light cup holder with a smooth inner surface.

[0011] Preferably, a heat sink is provided close to the lower part of the light source.

[0012] Preferably, the heat-insulating polarizing glass assembly includes heat-insulating glass and a polarizing filter, wherein the polarizing filter is disposed on the surface of the heat-insulating glass emission surface, and the heat-insulating glass and the polarizing filter are of the same size.

[0013] Preferably, the light-receiving size of the LCD display screen is the same as the size of the heat-insulating polarizing glass assembly.

[0014] Preferably, the light source consists of multiple independently controllable sub-light sources.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. The size of the optical engine is significantly reduced; 2. The light uniformity is significantly improved; 3. The original light contrast is significantly improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the lens arrangement of the present invention;

[0018] Figure 3 This is a schematic diagram of the lens focal length of the present invention. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0020] As shown in the attached figure, the miniaturized projection optical engine structure of the present invention includes a heat sink 1, an LED white light source 2, a honeycomb light cup holder 3, a honeycomb array lens 4, heat-insulating glass 5, and an LCD display panel 6.

[0021] The light beam emitted by the light source is initially collimated by the light cup holder before entering the honeycomb array lens. For example... Figure 2 As shown, the substrate material of this array lens is optical plastic, and its light-emitting surface is densely covered with regular hexagonal convex lens units. Each hexagonal unit has a side length of 'a' and an area of:

[0022]

[0023] The radius of the inscribed circle is equal to the apothem of the regular hexagon.

[0024]

[0025] The area of ​​the inscribed circle is:

[0026]

[0027] Fill rate R2:

[0028]

[0029] Each unit converges and adjusts the angle of the local beam. The beam integrated by the honeycomb array lens has high uniformity and collimation. The focal length of each lens unit collimates a portion of the beam passing through the aperture cup. The dense honeycomb structure efficiently "segments and reshapes" the entire large-aperture incident beam into an outgoing beam with good collimation characteristics.

[0030] Let the focal length of the hexagonal honeycomb lens be f3, the length of the aperture cup be d2, and the distance from the light source to the lens be H2. To achieve the highest luminous efficiency, f3 = d2 ≈ H2. Compared to traditional compound eye lens groups, if the focal length of the lens group is the same, the volume is reduced by approximately 33%. This light beam is then imaged onto the pixel surface of the LCD display panel through heat-insulating glass. The heat-insulating glass ensures that the shape and size of the illumination spot perfectly match the panel. A polarizer is located on the light-emitting surface of the heat-insulating glass, converting natural light into S-polarized light for use by the LCD panel.

Claims

1. A miniaturized projection optical engine structure, characterized in that, The light source (2), the light cup holder (3) above the light source (2), the honeycomb array lens (4) above the light cup holder (3) and closely attached to the light cup holder (3), the heat-insulating polarizing glass group (5), and the LCD display panel (6) are all parallel to each other and their geometric center points coincide.

2. The miniaturized projection optical engine structure according to claim 1, characterized in that, The light source (2) is an LED white light source.

3. The miniaturized projection optical engine structure according to claim 1, characterized in that, The honeycomb array lens (4) is composed of multiple hexagonal microlenses arranged in a seamless, densely packed manner.

4. The miniaturized projection optical engine structure according to claim 1, characterized in that, The light cup holder (3) is composed of multiple regular hexagonal light cups arranged in the densest possible order.

5. The miniaturized projection optical engine structure according to claim 4, characterized in that, Each of the regular hexagonal light cups corresponds to the position of each regular hexagonal microlens on the honeycomb array lens (4), and their axes coincide.

6. The miniaturized projection optical engine structure according to claim 4, characterized in that, The light cup holder (3) is an aluminum light cup holder with a smooth inner surface.

7. The miniaturized projection optical engine structure according to claim 1, characterized in that, The lower part of the light source (2) is fitted with a heat sink (1).

8. The miniaturized projection optical engine structure according to claim 1, characterized in that, The heat-insulating polarizing glass assembly (5) includes heat-insulating glass and a polarizing plate. The polarizing plate is disposed on the surface of the heat-insulating glass emission surface, and the heat-insulating glass and the polarizing plate are the same size.

9. The miniaturized projection optical engine structure according to claim 1, characterized in that, The light-receiving size of the LCD display screen (6) is the same as that of the heat-insulating polarizing glass assembly (5).

10. The miniaturized projection optical engine structure according to claim 1, characterized in that, The light source (2) consists of multiple independently controllable sub-light sources.

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