Microlens array structure and projection device comprising same

Abstract

The utility model discloses a microlens array structure and a projection device comprising the same, the microlens array structure comprises a field lens array, a pattern array, a projection lens array and a substrate, and the substrate is arranged between the pattern array and the projection lens array. Each sub-field lens in the field lens array, each sub-pattern in the pattern array and each sub-projection lens in the projection lens array are in one-to-one correspondence, the sub-field lenses, the sub-patterns and the sub-projection lenses which correspond to one another jointly form a sub-optical channel, the substrate comprises a first substrate, a second substrate and a light blocking structure, the pattern array is arranged on the light emitting surface of the first substrate, and the light blocking structure is arranged on the light emitting surface of the second substrate. The light blocking structure surrounds the sub optical channels and is provided with a light absorbing layer, a light reflecting layer or a light scattering layer; a diaphragm array is arranged on the light-in surface or the light-out surface of the projection lens array, and each sub-diaphragm of the diaphragm array corresponds to one sub-optical channel. The micro-lens array structure overcomes the problem that stray images are generated when large-angle incident light passes through different optical channels.

Description

Technical Field

[0001] The utility model relates to a projection display, in particular to a microlens array structure and a projection device containing the microlens array structure. Background Art

[0002] The microlens array is an array composed of lenses with a clear aperture and relief depth of micrometers, and each lens forms a separate optical channel. Like traditional lenses, its smallest functional unit can also be a spherical lens, aspherical lens, cylindrical lens, prism, etc. It can also achieve focusing, imaging, beam transformation and other functions at a micro-optical angle. Moreover, due to its small unit size and high integration, it can form many new optical systems and complete functions that traditional optical components cannot complete.

[0003] In the prior art, light incident on a microlens array at a large angle will be imaged through different optical channels, causing crosstalk between different channels and generating stray image problems. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide a microlens array structure and a projection device containing the same, so as to overcome the problem of generating stray images when large-angle incident light passes through different optical channels in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a microlens array structure, including a field lens array, a pattern array, a projection lens array, and a substrate, wherein the field lens array, the pattern array, and the projection lens array are arranged in sequence along the light propagation direction, the substrate is arranged between the pattern array and the projection lens array, each sub-field lens in the field lens array, each sub-pattern in the pattern array, and each sub-projection lens in the projection lens array correspond to each other, and the corresponding sub-field lenses, sub-patterns, and sub-projection lenses together constitute a sub-optical channel, the substrate includes a first substrate, a second substrate, and a light blocking structure, the first substrate and the second substrate are arranged in sequence along the light propagation direction, the pattern array is arranged on the light exiting surface of the first substrate, the light blocking structure surrounds each sub-optical channel, and the light blocking structure has a light absorption layer, a light reflection layer or a light scattering layer; an aperture array is arranged on the light incident surface or the light exiting surface of the projection lens array, and each sub-aperture of the aperture array corresponds to a sub-optical channel.

[0006] Furthermore, the light blocking structure is disposed in the second substrate, and the light blocking structure extends from the light incident surface to the light emitting surface of the second substrate.

[0007] Furthermore, the light blocking structure extends to the light emitting surface of the second substrate.

[0008] Furthermore, the light blocking structure is arranged between the first substrate and the second substrate.

[0009] Furthermore, the sub-pattern includes a light-blocking portion and a light-leaking portion, and the light-blocking portion is a metal film, a metal oxide film or an organic material film.

[0010] Furthermore, the light leakage portion is provided with a color filter.

[0011] Furthermore, the color filters arranged in the light leakage parts of the sub-patterns have the same or different light transmission spectra.

[0012] Furthermore, the light emitting surface of the first substrate and the light incident surface of the second substrate are glued together.

[0013] A projection device comprises a light source, a screen and the above-mentioned microlens array structure arranged between the light source and the screen.

[0014] Beneficial effect: By setting a light-blocking structure in the base, each sub-optical channel is surrounded, and the light propagating in each sub-optical channel is prevented from propagating to other sub-optical channels. At the same time, by setting an aperture array on the light entrance surface or light exit surface of the projection mirror array aperture array, the light from other sub-optical projection channels is prevented from passing through, thereby avoiding crosstalk and stray image problems of different optical channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the microlens array structure of Example 1;

[0016] Figure 2 This is a schematic diagram of gluing the first substrate and the second substrate in Example 1;

[0017] Figure 3 is a schematic diagram of a first substrate in accordance with the first embodiment;

[0018] Figure 4 is a schematic diagram of a second substrate in Example 1;

[0019] Figure 5 is a schematic diagram of the microlens array structure of the second embodiment;

[0020] Figure 6 This is a schematic diagram of gluing the first substrate and the second substrate of Example 2;

[0021] Figure 7 is a schematic diagram of the microlens array structure of Example 3;

[0022] Figure 8 This is a schematic diagram of bonding the first substrate, the second substrate, and the light-blocking structure of Example 3;

[0023] Fig. 9 is a schematic diagram of the microlens array structure of the fourth embodiment;

[0024] Fig.10is a schematic diagram of a projection device according to Embodiment 5;

[0025] In the figure: 1-field mirror array; 2-pattern array; 3-projection mirror array; 4-aperture array; 5-first substrate; 6-second substrate; 7-light blocking structure; 8-light source; 9-screen. DETAILED DESCRIPTION

[0026] The utility model is further explained below in conjunction with the accompanying drawings.

[0027] Embodiment 1

[0028] like Figure 1 As shown, a microlens array structure of the utility model comprises a field lens array 1, a pattern array 2, a projection lens array 3 and a substrate. The field lens array 1, the pattern array 2 and the projection lens array 3 are arranged in sequence along the light propagation direction, the substrate is arranged between the pattern array 2 and the projection lens array 3, each sub-field lens in the field lens array 1, each sub-pattern in the pattern array 2 and each sub-projection lens in the projection lens array 3 correspond to each other one by one, and the corresponding sub-field lenses, sub-patterns and sub-projection lenses together constitute a sub-optical channel.

[0029] like Figures 2 to 4 As shown, the substrate includes a first substrate 5, a second substrate 6, and a light blocking structure 7. The first substrate 5 and the second substrate 6 are arranged in sequence along the light propagation direction, and the light exit surface of the first substrate 5 is glued together with the light incident surface of the second substrate 6. The pattern array 2 is arranged on the light exit surface of the first substrate 5, and the sub-pattern of the pattern array 2 includes a light blocking portion and a light leakage portion. The light blocking structure 7 is arranged in the second substrate 6, and the light blocking structure 7 extends from the light incident surface of the second substrate 6 to the light exit surface, and the light blocking structure 7 surrounds each sub-optical channel. In this embodiment, the light blocking structure extends to the light exit surface of the second substrate 6.

[0030] The light blocking structure 7 has a light absorbing layer that can absorb light. The light blocking structure allows large-angle light in the light propagating in the microlens array to be absorbed by the light blocking structure when propagating from the original channel to other channels.

[0031] An aperture array 4 is arranged on the light incident surface of the projection mirror array 3, and each sub-aperture of the aperture array 4 corresponds to a sub-optical channel. The sub-aperture only allows the light from its corresponding sub-optical projection channel to pass through, while preventing the light from other sub-optical projection channels from passing through.

[0032] In this embodiment, the light blocking part of the sub-pattern is a metal film, and the light leaking part of the sub-pattern is a vacuum. The color and intensity of the light propagating in the microlens array will not change.

[0033] Embodiment 2

[0034] like Figure 5 As shown, a microlens array structure of the utility model comprises a field lens array 1, a pattern array 2, a projection lens array 3 and a substrate. The field lens array 1, the pattern array 2 and the projection lens array 3 are arranged in sequence along the light propagation direction, the substrate is arranged between the pattern array 2 and the projection lens array 3, each sub-field lens in the field lens array 1, each sub-pattern in the pattern array 2 and each sub-projection lens in the projection lens array 3 correspond to each other one by one, and the corresponding sub-field lenses, sub-patterns and sub-projection lenses together constitute a sub-optical channel.

[0035] like Figure 6 As shown, the substrate includes a first substrate 5, a second substrate 6, and a light blocking structure 7. The first substrate 5 and the second substrate 6 are arranged in sequence along the direction of light propagation. The pattern array 2 is arranged on the light emitting surface of the first substrate 5, and the light blocking structure 7 is arranged in the second substrate 6. The light blocking structure 7 extends from the light incident surface to the light emitting surface of the second substrate 6, and the light blocking structure 7 surrounds each sub-optical channel.

[0036] The light blocking structure 7 has a light reflecting layer which can reflect light. The light blocking structure enables large-angle light in the light propagating in the microlens array to be reflected by the light blocking structure when propagating from the original channel to other channels.

[0037] An aperture array 4 is arranged on the light incident surface of the projection mirror array 3, and each sub-aperture of the aperture array 4 corresponds to a sub-optical channel. The sub-aperture only allows the light from its corresponding sub-optical projection channel to pass through, while preventing the light from other sub-optical projection channels from passing through.

[0038] In this embodiment, the light-blocking part of the sub-pattern is a metal oxide film, and the light-leaking part of the sub-pattern is provided with a color filter, and the light-transmitting spectrum of the color filter provided in the light-leaking part of each sub-pattern is the same, so that the color and intensity of the light propagating in the microlens array are changed under the action of the color filter.

[0039] Embodiment 3

[0040] like Figure 7 As shown, a microlens array structure of the utility model comprises a field lens array 1, a pattern array 2, a projection lens array 3 and a substrate. The field lens array 1, the pattern array 2 and the projection lens array 3 are arranged in sequence along the light propagation direction, the substrate is arranged between the pattern array 2 and the projection lens array 3, each sub-field lens in the field lens array 1, each sub-pattern in the pattern array 2 and each sub-projection lens in the projection lens array 3 correspond to each other one by one, and the corresponding sub-field lenses, sub-patterns and sub-projection lenses together constitute a sub-optical channel.

[0041] like Figure 8As shown, the substrate includes a first substrate 5, a second substrate 6, and a light blocking structure 7. The first substrate 5 and the second substrate 6 are arranged in sequence along the light propagation direction. The pattern array 2 is arranged on the light emitting surface of the first substrate 5. The light blocking structure 7 is arranged between the first substrate 5 and the second substrate 6. One end of the light blocking structure 7 is bonded to the light emitting surface of the first substrate 5, and the other end is bonded to the light incident surface of the second substrate 6. The light blocking structure 7 surrounds each sub-optical channel.

[0042] The light blocking structure 7 has a light scattering layer and a light reflecting layer which can refract the light regularly. The light blocking structure enables the light with a large angle among the light propagating in the microlens array to be deflected toward the original channel by the light blocking structure when propagating from the original channel to other channels.

[0043] An aperture array 4 is arranged on the light incident surface of the projection mirror array 3, and each sub-aperture of the aperture array 4 corresponds to a sub-optical channel. The sub-aperture only allows the light from its corresponding sub-optical projection channel to pass through, while preventing the light from other sub-optical projection channels from passing through.

[0044] In this embodiment, the light-blocking portion of the sub-pattern is an organic material film, and a color filter is provided on the light-leaking portion of the sub-pattern. The color filters provided on the light-leaking portions of each sub-pattern have different light transmittance spectra, so that the color and intensity of light propagating in the microlens array change under the action of the color filter, and the color and intensity of light in each sub-optical channel change differently.

[0045] Embodiment 4

[0046] like Fig. 9 As shown, the difference between the fourth embodiment and the first embodiment is that the aperture array 4 is arranged on the light exit surface of the projection mirror array 3.

[0047] Embodiment 5

[0048] like Fig.10 As shown, a projection device of the present invention comprises a light source 8, a screen 9 and the microlens array structure in the above-mentioned embodiment 1 arranged between the light source 8 and the screen 9.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A microlens array structure, comprising a field lens array, a pattern array, a projection lens array, and a substrate, wherein the field lens array, the pattern array, and the projection lens array are sequentially arranged along the light propagation direction, the substrate is arranged between the pattern array and the projection lens array, each sub-field lens in the field lens array, each sub-pattern in the pattern array, and each sub-projection lens in the projection lens array correspond to each other, and the corresponding sub-field lenses, sub-patterns, and sub-projection lenses together constitute a sub-optical channel, characterized in that: The substrate includes a first substrate, a second substrate, and a light blocking structure. The first substrate and the second substrate are arranged in sequence along the light propagation direction. The pattern array is arranged on the light exit surface of the first substrate. The light blocking structure surrounds each sub-optical channel. The light blocking structure has a light absorption layer, a light reflection layer or a light scattering layer. An aperture array is arranged on the light entrance surface or the light exit surface of the projection mirror array, and each sub-aperture of the aperture array corresponds to a sub-optical channel.

2. A microlens array structure according to claim 1, characterized in that: The light blocking structure is arranged in the second substrate, and the light blocking structure extends from the light incident surface to the light emitting surface of the second substrate.

3. A microlens array structure according to claim 2, characterized in that: The light blocking structure extends to the light emitting surface of the second substrate.

4. The microlens array structure according to claim 1, characterized in that: The light blocking structure is arranged between the first substrate and the second substrate.

5. The microlens array structure according to claim 1, characterized in that: The sub-pattern includes a light blocking portion and a light leaking portion, and the light blocking portion is a metal film, a metal oxide film or an organic material film.

6. A microlens array structure according to claim 5, characterized in that: The light leakage part is provided with a color filter.

7. A microlens array structure according to claim 6, characterized in that: The color filters arranged in the light leakage parts of each sub-pattern have the same or different light transmission spectra.

8. The microlens array structure according to claim 1, characterized in that: The light emitting surface of the first substrate and the light incident surface of the second substrate are glued together.

9. A projection device, characterized in that: The invention comprises a light source, a screen and a microlens array structure as claimed in any one of claims 1 to 8 arranged between the light source and the screen.

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