CN113766196A

CN113766196A - A device for extending pixel resolution and projection display system

Info

Publication number: CN113766196A
Application number: CN202010498882.4A
Authority: CN
Inventors: 赵鹏; 陈孟浩; 方元戎
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2021-12-07
Anticipated expiration: 2040-06-04
Also published as: WO2021244400A1

Abstract

The present application discloses a device for extending pixel resolution and a projection display system. The device includes an offset wheel, a compensation wheel and a driver. The offset wheel is used to receive incident light beams and includes a plurality of offset regions; the compensation wheel is arranged on the The outgoing light path of the offset wheel is used to receive the light beam emitted by the offset wheel, and includes a plurality of compensation areas; the driver is connected with the offset wheel and the compensation wheel, and is used for driving the offset wheel and the compensation wheel to rotate; wherein, the offset area Corresponding to the compensation area, the position of the virtual image formed by the incident beam passing through the offset wheel and the compensation wheel in sequence remains unchanged. In the above manner, the present application can eliminate the imaging phase difference, so that the imaging is clear.

Description

Device for expanding pixel resolution and projection display system

Technical Field

The application relates to the technical field of projection display, in particular to a device for expanding pixel resolution and a projection display system.

Background

In the DLP (Digital Light processing) projection display technology, a DMD (Digital Micromirror Device) is a crucial optical element, and directly determines the Resolution of an image, and a display system with 4K Resolution (Pixel value of each line in the horizontal direction reaches or approaches 4096) has become a mainstream display technology at present, but the price of a DMD chip with 4K Resolution is relatively high, and is not suitable for many scenes, so that a Pixel offset Resolution technology is adopted, which realizes image display with higher Resolution than that of an originally adopted DMD chip by offsetting pixels (such as a distance of moving a half Pixel in a directional manner), for example, extending Pixel Resolution can be realized by adopting XPR (Extended Pixel Resolution), so that a low-Resolution dimming Device is used to realize a high-Resolution display effect, however, the current XPR solution has inherent imaging potential differences, which results in unclear imaging.

Disclosure of Invention

The application provides a device and projection display system of extension pixel resolution ratio, can eliminate the formation of image phase difference for the formation of image is clear.

In order to solve the technical problem, the technical scheme adopted by the application is as follows: there is provided an apparatus for extending a pixel resolution, the apparatus for extending a pixel resolution including: the device comprises an offset wheel, a compensation wheel and a driver, wherein the offset wheel is used for receiving an incident light beam and comprises a plurality of offset areas; the compensating wheel is arranged on an emergent light path of the offset wheel, is used for receiving light beams emitted by the offset wheel and comprises a plurality of compensating areas; the driver is connected with the offset wheel and the compensation wheel and is used for driving the offset wheel and the compensation wheel to synchronously rotate; the offset area and the compensation area are correspondingly arranged, and the position of a virtual image formed by the incident light beam sequentially passing through the offset wheel and the compensation wheel is kept unchanged.

In order to solve the above technical problem, another technical solution adopted by the present application is: there is provided a projection display system comprising: a light source and a pixel resolution expanding device, the light source is used for generating a projection light beam; the device for expanding the pixel resolution is arranged on an emergent light path of the light source and is used for expanding the resolution of the projection light beam, wherein the device for expanding the pixel resolution is the device for expanding the pixel resolution.

Through the scheme, the beneficial effects of the application are that: adopt the skew wheel to carry out the deflection to incident beam, because the virtual image that produces from the regional outgoing light beam of different drifts of skew wheel may not be located same level/vertical face, therefore set up a compensation wheel, this compensation wheel has the compensation area who matches with the regional matching of skew in the skew wheel, because the difference that results in of difference between each skew region can be compensated in regional existence of compensation, under the prerequisite of realization extension projection beam resolution, make all from the regional outgoing light beam of skew all be located same level/vertical face in the virtual image that forms behind corresponding compensation area, thereby eliminate the formation of image position difference, help improving the definition of formation of image.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

FIG. 1 is a schematic diagram of the path of an incident beam through a flat panel;

FIG. 2(a) is a schematic diagram of the optical path of light incident on a first region of a turntable;

FIG. 2(b) is a schematic diagram of the light path of light incident on the second region of the turntable;

FIG. 3 is a schematic structural diagram of an embodiment of an apparatus for extending pixel resolution provided herein;

FIG. 4 is a schematic diagram of the construction of the offset wheel in the embodiment shown in FIG. 2;

FIG. 5 is a schematic view of the construction of the compensating wheel of the embodiment shown in FIG. 2;

FIG. 6 is a schematic diagram illustrating an embodiment of an apparatus for extending pixel resolution provided herein;

FIG. 7(a) is a schematic illustration of the virtual image position formed using a single offset wheel;

FIG. 7(b) is a schematic diagram of a virtual image position formed by using an embodiment of the apparatus for extending pixel resolution provided in the present application;

FIG. 8 is a schematic structural diagram of another embodiment of an apparatus for extending pixel resolution provided herein;

fig. 9 is a schematic structural diagram of an embodiment of a projection display system provided in the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As shown in fig. 1, the flat plate 10 is deflected clockwise by an angle θ along a direction perpendicular to the incident light beam a, the thickness of the flat plate 10 is t, the refractive index of the flat plate 10 is n, after the incident light beam a passes through the flat plate 10, according to the law of refraction, the light beam originally advancing according to the B direction advances along the C direction due to the refraction of the flat plate 10, so that the light beam deflection of Δ y is realized, and the deflection amount Δ y of the incident light beam a is:

therefore, by adjusting the values of Δ y, θ, and t, a quantitative shift of the pixel can be achieved. According to the principle described above, the XPR function can be implemented using a wheel with different thicknesses and/or refractive indices in different positions, as shown in figure 2, a rotating disc 101 rotatable about an axis 105, divided into a first region 102 and a second region 106, said first region 102 and said second region 106 having respectively different refractive indices n₁And n₂And the plane angle of the wavefront with respect to the light ray is theta₁The first region 102 and the second region 106 have different thicknesses t₁And t₂Where 100 is the light exiting the spatial light modulator to the wheel, as shown in FIG. 2(a), the light 100 passes through a thickness t₁After the first region 102, the offset Δ y is formed₁Comprises the following steps:

when the turntable 101 rotates to the second region 106, as shown in FIG. 2(b), the light ray 100 passes through the second region 106 with a thickness t2, and then forms an offset Δ y₂Comprises the following steps:

in summary, when the XPR function is implemented by using a plate wheel structure, since the light repeatedly and alternately passes through the plate regions with different thicknesses or/and different refractive indexes, the light is repeatedly shifted to two positions, thereby implementing different pixel shifts in the time sequence.

However, it is known that when a light beam passes through a flat plate having a thickness t and a refractive index n, the position of a virtual image obtained by inverting the outgoing light beam is displaced from the position of the light source by the refraction of the flat plate, and when the incident angle of the light beam corresponding to the light emitting point is relatively small, sin (θ) is θ, and the amount of displacement is Δ s — t/n.

Therefore, when the flat plate runner structure with a plurality of flat plate areas with different thicknesses or/and different refractive indexes is used for realizing different deviations of light, the formed virtual images can be different in position, if light beams need to be imaged through a lens, the back focal depth of the lens is shorter, the different virtual images can not simultaneously form clear and sharp images on different sub-frame pictures of XPR due to different positions, and the use scene of the rotary XPR device is limited.

This application is based on rotary type XPR device, there is inherent formation of image potential difference to current rotary type XPR's embodiment, set up a compensating wheel through the combination and solve rotary type XPR when using because the regional thickness or the refracting index of a plurality of offsets of offsetting wheel are different, make the produced virtual image of the light beam of outgoing can not be located the problem that the virtual image position that causes appears changing on same level/vertical face, the compensating wheel has the compensation area who matches with the offset area, because the difference that exists in compensation area can compensate between each offset area leads to poor, make all light beams of following the regional outgoing of offset all be located same level/vertical face at the virtual image that forms behind corresponding compensation area, thereby reach the effect of eliminating the formation of image potential difference, thereby rotary type XPR's definition and quality of imaging have been guaranteed. Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of an apparatus for expanding pixel resolution provided in the present application, where the apparatus 30 for expanding pixel resolution includes: a driver 31, an offset wheel 32 and a compensation wheel 33.

The driver 31 is connected with the offset wheel 32 and the compensation wheel 33 and is used for driving the offset wheel 32 and the compensation wheel 33 to rotate; specifically, the driver 31 may drive the offset wheel 32 and the compensation wheel 33 to rotate synchronously at a preset rotation speed after receiving the control instruction, the driver 31 may drive the offset wheel 32 and the compensation wheel 33 simultaneously, or the driver 31 may include two driving devices, one driving device driving the offset wheel 32 and the other driving device driving the compensation wheel 33.

The deflecting wheel 32 is used for receiving an incident light beam, specifically, as shown in fig. 4, the deflecting wheel 32 may be a transparent plastic plate with a refractive index n or other transparent material with a refractive index greater than that of air, and includes a plurality of deflecting regions 321, each of the deflecting regions 321 has a different thickness and/or refractive index, and the number of the deflecting regions 321 is not limited to 4 shown in fig. 4, and may be set according to specific needs.

The compensating wheel 33 is arranged on the emergent light path of the offset wheel 32 and is used for receiving the light beam emitted by the offset wheel 32; specifically, as shown in fig. 5, the compensation wheel 33 includes a plurality of compensation regions 331, each of the compensation regions 331 has a different thickness and/or refractive index, and the number of the compensation regions 331 is not limited to 4 shown in fig. 5, and can be set according to specific requirements. The offset areas 321 are arranged corresponding to the compensation areas 331, the number of the offset areas 321 is matched with that of the compensation areas 331, and the offset wheel 32 and the compensation wheel 33 rotate synchronously, namely the rotating speed of the offset wheel 32 is the same as that of the compensation wheel 32; the incident light beams sequentially pass through the shift wheel 32 and the compensation wheel 33 and then are shifted by a preset shift amount in the vertical direction, and the incident light beams sequentially pass through the shift regions 321 and the corresponding compensation regions 331 to generate the same virtual image position difference, which is the horizontal distance between the virtual image formed by the light beams emitted from each compensation region 331 and the light source generating the incident light beams.

Referring to fig. 6-7, fig. 6 is a schematic structural diagram of an embodiment of the apparatus for expanding pixel resolution provided in the present application, in which an angle between a rotation axis of the offset wheel 61 and a vertical direction is a first preset angle, and an angle between a rotation axis of the compensation wheel 62 and the vertical direction is a second preset angle.

The refractive index or thickness of the plurality of shift regions changes monotonically in the rotational direction of the shift wheel 61 to sequentially shift the incident light beam by a first preset shift amount within a rotational period; the refractive index or thickness of the plurality of compensation regions varies monotonically along the direction of rotation of the compensation wheel 62.

Further, the plurality of offset regions includes a first offset region 611 and a second offset region 612, and the plurality of compensation regions includes a first compensation region 621 and a second compensation region 622. The incident light beam a sequentially passes through the shift wheel 61 and the compensation wheel 62, and the rotation of the shift wheel 61 and the compensation wheel 62 is synchronized, so that the two areas of the two wheels are always consistent, that is, the incident light beam a passes through the first compensation area 621 after passing through the first shift area 611, and the incident light beam a passes through the second compensation area 622 after passing through the second shift area 612.

In a specific embodiment, the compensation wheel 62 is configured to sequentially shift the light beam emitted from the shift wheel 61 by a second predetermined shift amount in a rotation period, and a predetermined shift amount generated when the light beam corresponding to the light-emitting point a1 and the light-emitting point a2 sequentially passes through one of the shift regions and the corresponding compensation region is equal to a sum of the first predetermined shift amount and the second predetermined shift amount, specifically, when an incident angle of the light beam corresponding to the light-emitting point is smaller, since sin (θ) is θ, a first shift amount generated when the light-emitting point a1 corresponding to the incident light beam sequentially passes through the first shift region 611 and the first compensation region 621 is:

the second offset generated after the incident beam sequentially passes through the second offset region 612 and the second compensation region 622 is:

wherein theta is a first preset angle, theta' is a second preset angle, t₁And n₁The thickness and refractive index, t, of the first offset region 611₂And n₂The thickness and refractive index, t, of the second offset region 612₁' and n₁' thickness and refractive index, t ', respectively, of the first compensation region 621 '₂And n'₂The thickness and the refractive index of the second compensation region 622, respectively.

Referring to fig. 7, fig. 7 is a schematic diagram illustrating a virtual image position formed by using a single shift wheel and the apparatus for extending pixel resolution according to the present embodiment. When the XPR function is implemented using a single deflecting wheel, as shown in fig. 7(a), the positions of virtual images formed by the light beams passing through different regions of the deflecting wheel do not lie on the same vertical plane. That is, since the light beam passes through the offset regions with different thicknesses or different refractive indexes, when different offsets of the light beam are realized, the virtual image is formed in different positions.

As shown in fig. 7(B), when the XPR function is implemented by using the device for expanding pixel resolution of the present embodiment, a virtual image formed by light beams emitted after an incident light beam sequentially passes through the first offset region 611 and the first compensation region 621 at the light-emitting point a1 is denoted as B1, and a first position difference generated by the position of the virtual image B1 with respect to the position of the light-emitting point a1 is:

a virtual image formed by the incident light beam of the light-emitting point a2 passing through the second offset region 612 and the light beam emitted from the second compensation region 622 in sequence is denoted as B2, and a second position difference of the virtual image B2 with respect to the light-emitting point a2 is:

wherein, it is not equal to satisfy to realize that the first offset of XPR functional requirement is not equal with the second offset, and satisfy that the dotted line position does not change and require that first position difference is equal with the second position difference, can discover through the equation, as long as first predetermined angle theta is different with second predetermined angle theta', just can guarantee under the condition of delta s1 is delta s2, satisfy delta x1 and delta x2 inequality, do not change under the prerequisite of virtual image position promptly, realize the XPR function.

In another specific embodiment, as shown in fig. 8, the second predetermined angle is 0 °, i.e. the rotation axis of the compensation wheel 62 coincides perfectly with the vertical direction; the first offset is equal to a first preset offset, i.e. the compensating wheel 62 does not offset the light beam emitted from the offset wheel 61; the first offset region 611 has the same thickness as the second compensation region 622, the first offset region 611 has the same refractive index as the second compensation region 622, the second offset region 612 has the same thickness as the first compensation region 621, and the second offset region 612 has the same refractive index as the first compensation region 621, that is, the offset wheel 61 and the compensation wheel 62 are the same wheel, and there is only a difference in the angle of the rotation axis.

The incident light beam A passes through the offset wheel 61 to obtain a light beam B, different offset areas enable the incident light beam to have different offset and different virtual image positions, the light beam B further passes through the compensation wheel 62, and due to the fact that the rotating shaft of the compensation wheel 62 is completely horizontal, the light beam B does not offset after passing through the compensation wheel 62, and only the position of a formed virtual image is changed; when the incident light beam passes through two regions of the shift wheel 61 and the compensation wheel 62, since the regions are both thick and thin regions with matched refractive indexes, the virtual images are positioned in the same position, and since the compensation wheel 62 does not generate an additional shift to the light beam, the shift amount generated when the light beam passes through different regions is different. This embodiment uses two wheels to realize the skew to incident beam, and the thickness, refracting index and the axis of rotation of two wheels are different with vertical direction's contained angle, can realize the pixel extended function under the prerequisite that the virtual image position remains unchanged.

It will be appreciated that it is also possible to set the second predetermined angle to 0 °, i.e. the axis of rotation of the offset wheel is perfectly coincident with the vertical; the preset offset is equal to a second preset offset, namely the offset wheel does not offset the incident beam; as in the previous embodiment, the offset and compensation wheels are identical wheels, differing only in the angle of the axis of rotation. Incident beam does not produce the skew after passing the skew wheel, and the emergent beam further passes the compensation wheel, and different compensation regions make the light beam of incident have different offsets, but because the light beam of incident when two regions through skew wheel and compensation wheel, the region of process all is one thick one thin, two regions of refracting index assorted, therefore the position of virtual image is unanimous, can keep realizing the pixel extension function under the unchangeable prerequisite in the virtual image position.

Referring to fig. 9, fig. 9 is a schematic structural diagram of an embodiment of a projection display system provided in the present application, where the projection display system 90 includes: a light source 91 and a pixel resolution expanding device 92, wherein the light source 91 is used for generating a projection light beam; the pixel resolution expansion device 92 is disposed on the light emitting path of the light source 91, and is used for expanding the projection light beam, and the pixel resolution expansion device 92 is the pixel resolution expansion device in the above embodiment.

The projection Display system 90 in this embodiment uses the device 92 for expanding the pixel resolution that corrects the imaging potential difference, and realizes a higher Display resolution while ensuring low cost, and the projection Display system 90 can be applied to a 3LCD (Liquid Crystal Display) Display system and an LCOS (Liquid Crystal on Silicon) Display system to realize pixel expansion.

The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.

Claims

1. a device for extending pixel resolution, is characterized in that, comprises:

an offset wheel for receiving the incident beam, including a plurality of offset areas;

a compensation wheel, arranged on the outgoing light path of the deflection wheel, for receiving the light beam emitted by the deflection wheel, including a plurality of compensation areas;

a driver, connected with the offset wheel and the compensation wheel, for driving the offset wheel and the compensation wheel to rotate;

Wherein, the offset area and the compensation area are set correspondingly, and the position of the virtual image formed after the incident light beam passes through the offset wheel and the compensation wheel in sequence remains unchanged.

2. The device for extending pixel resolution according to claim 1, wherein,

The offset wheel and the compensation wheel rotate synchronously, and the incident light beam passes through the shift wheel and the compensation wheel in sequence, and is shifted by a preset offset amount in the vertical direction, and the incident light beam sequentially passes through the offset wheel and the compensation wheel. The position difference generated after passing through the offset area and the corresponding compensation area is the same, wherein the position difference is the difference between the virtual image formed by the light beams exiting from each compensation area and the light source generating the incident light beam horizontal distance between.

3. The device for extending pixel resolution according to claim 2, wherein,

The refractive index or thickness of the plurality of offset regions changes monotonically along the rotation direction of the offset wheel, so as to sequentially offset the incident light beam by a first preset offset amount within the rotation period, and the offset wheel The angle between the rotation axis of the compensating wheel and the vertical direction is the first preset angle; the refractive index or thickness of the plurality of compensation regions changes monotonically along the rotation direction of the compensating wheel, and the rotation axis of the compensating wheel is perpendicular to the vertical direction. The angle between the directions is a second preset angle, wherein the first preset angle is different from the second preset angle.

4. The device for extending pixel resolution according to claim 3, wherein,

The compensating wheel is further used for sequentially shifting the outgoing beam of the shifting wheel by a second preset offset amount within the rotation period, and the preset offset amount is equal to the first preset offset amount and the second preset offset.

5. The device for extending pixel resolution according to claim 3, wherein,

The second preset angle is 0°, and the preset offset is equal to the first preset offset.

6. The device for extending pixel resolution according to claim 3, wherein,

The plurality of offset regions include a first offset region and a second offset region, and the plurality of compensation regions include a first compensation region and a second compensation region.

7 . The device for extending pixel resolution according to claim 6 , wherein the first position difference generated after the incident beam passes through the first offset area and the first compensation area in sequence is: 7 .

The second position difference generated after the incident beam passes through the second offset area and the second compensation area in sequence is:

The first position difference is equal to the second position difference, t ₁ and n ₁ are the thickness and refractive index of the first offset region, respectively, and t ₂ and n ₂ are the second offset, respectively The thickness and refractive index of the region, t' ₁ and n' ₁ are the thickness and refractive index of the first compensation region, respectively, and t' ₂ and n' ₂ are the thickness and refractive index of the second compensation region, respectively.

8 . The device for extending pixel resolution according to claim 7 , wherein the first offset generated by the incident light beam passing through the first offset area and the first compensation area in sequence is: 8 .

The second offset generated by the incident beam passing through the second offset area and the second compensation area in sequence is:

Wherein, θ is the first preset angle, and θ' is the second preset angle.

9. The device for extending pixel resolution according to claim 6, wherein,

The first offset region and the second compensation region have the same thickness and refractive index, and the second offset region and the first compensation region have the same thickness and refractive index.

10. A projection display system, comprising: a light source and a device for extending pixel resolution, the light source is used to generate a projection beam; the device for extending pixel resolution is arranged on the outgoing light path of the light source, For extending the resolution of the projection beam, the device for extending pixel resolution is the device for extending pixel resolution according to any one of claims 1-9.