Projection device and display system

Abstract

An embodiment of the present disclosure provides a projection device and a display system. The projection device includes: a light-emitting component, a light conversion component, and a projection lens; the light conversion component includes: a display liquid crystal panel located on the light-emitting side of the light-emitting component and a polarization liquid crystal panel located on the light-emitting side of the display liquid crystal panel; the display liquid crystal panel is configured to alternately emit the light incident on the display liquid crystal panel as the first linearly polarized light corresponding to the first image and the second linearly polarized light corresponding to the second image, and the polarization direction of the first linearly polarized light is the same as the polarization direction of the second linearly polarized light; the polarization liquid crystal panel is configured to alternately emit the first linearly polarized light and the second linearly polarized light incident on the polarization liquid crystal panel as the third linearly polarized light corresponding to the first image and the fourth linearly polarized light corresponding to the second image, and the polarization direction of the third linearly polarized light is perpendicular to the polarization direction of the fourth linearly polarized light; the projection lens is configured to alternately project the third linearly polarized light and the fourth linearly polarized light onto a predetermined area.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to, but are not limited to, the field of display technologies, and in particular, to a projection device and a display system. Background Art

[0002] In recent years, with the rapid development of smart projection, the projection system has broad application potential due to its excellent way of presenting images, and thus has received increasing attention.

[0003] Currently, three-dimensional (3D) projection devices in some technologies usually require multiple projectors to be stacked, and sometimes software is also needed for geometric correction of multiple projectors to achieve the effect. Therefore, 3D projection devices in some technologies have problems such as complex structures, large sizes, poor portability, and high manufacturing costs. Summary of the Invention

[0004] The following is an overview of the subject matter described in detail in this document. This overview is not intended to limit the scope of protection of the claims.

[0005] In a first aspect, embodiments of the present disclosure provide a projection device, including: a light-emitting component, a light conversion component, and a projection lens, where,

[0006] The light-emitting component is configured to generate light;

[0007] The light conversion component includes: a display liquid crystal panel located on the light-emitting side of the light-emitting component and a polarized liquid crystal panel located on the light-emitting side of the display liquid crystal panel. The display liquid crystal panel is configured to alternately emit the light incident on the display liquid crystal panel as first linearly polarized light corresponding to a first image and second linearly polarized light corresponding to a second image, and the polarization direction of the first linearly polarized light is the same as the polarization direction of the second linearly polarized light; the polarized liquid crystal panel is configured to alternately emit the first linearly polarized light and the second linearly polarized light incident on the polarized liquid crystal panel as third linearly polarized light corresponding to the first image and fourth linearly polarized light corresponding to the second image, and the polarization direction of the third linearly polarized light is perpendicular to the polarization direction of the fourth linearly polarized light;

[0008] The projection lens is configured to alternately project the third linearly polarized light and the fourth linearly polarized light onto a predetermined area.

[0009] In a second aspect, embodiments of the present disclosure provide a display system, including: a projection screen and the projection device described in the above embodiments. The projection screen is located on the light-emitting side of the projection lens and is configured to display a first image and a second image.

[0010] The projection device and display system provided by the embodiments of the present disclosure can modulate incident light through a display liquid crystal panel to obtain first linearly polarized light and second linearly polarized light with the same polarization direction that are alternately emitted. By modulating the first linearly polarized light and the second linearly polarized light with the same polarization direction through a polarized liquid crystal panel, third linearly polarized light and fourth linearly polarized light with perpendicular polarization directions that are alternately emitted can be obtained. By projecting the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions that are alternately emitted onto a predetermined area (such as a projection screen or a curtain, etc.) through a projection lens, in this way, polarized 3D projection can be realized. Thus, by applying the display liquid crystal panel and the polarized liquid crystal panel arranged front and back, based on the polarization effect of liquid crystal molecules, a good 3D projection display effect can be achieved with only one projection device. The structure is relatively simple, the size of the 3D projection device can be effectively reduced, the cost of the 3D projection device can be reduced, and the portability of the 3D projection device can be enhanced.

[0011] Other features and advantages of the present disclosure will be described in the following description, and, in part, will be obvious from the description, or will be understood by implementing the present disclosure. Other advantages of the present disclosure can be realized and obtained through the solutions described in the description and the drawings.

[0012] Other aspects can be understood after reading and understanding the drawings and the detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings are used to provide an understanding of the technical solutions of the present disclosure and constitute a part of the description. They are used together with the embodiments of the present disclosure to explain the technical solutions of the present disclosure and do not constitute a limitation to the technical solutions of the present disclosure. The shapes and sizes of the components in the drawings do not reflect the actual proportions, and the purpose is only to schematically illustrate the content of the present disclosure.

[0014] Figure 1 It is a schematic structural diagram of a projection device in an exemplary embodiment of the present disclosure;

[0015] Figure 2 It is another schematic structural diagram of a projection device in an exemplary embodiment of the present disclosure;

[0016] Figure 3 It is a schematic diagram of a Fresnel lens in an exemplary embodiment of the present disclosure;

[0017] Figure 4 It is yet another schematic structural diagram of a projection device in an exemplary embodiment of the present disclosure;

[0018] Figure 5 is Figure 1 The 3D projection principle diagram of the shown projection device;

[0019] Figure 6Schematic structural diagram of a display system in an exemplary embodiment of the present disclosure;

[0020] Figure 7 Optical path schematic diagram of a display system in an exemplary embodiment of the present disclosure.

[0021] Explanation of reference numerals:

[0022] 11 - Light-emitting component; 12 - Light conversion component; 13 - Projection lens;

[0023] 14 - Display liquid crystal panel; 15 - Polarizing liquid crystal panel; 141 - First array substrate;

[0024] 142 - Color filter substrate; 143 - First liquid crystal layer; 144 - First polarizer;

[0025] 145 - Second polarizer; 151 - Second array substrate; 152 - Transparent substrate;

[0026] 153 - Second liquid crystal layer; 16 - First condenser component; 31 - Central part;

[0027] 32 - Annular part; 111 - Substrate; 112 - Light-emitting element;

[0028] 113 - Collimating light extraction component; 114 - Second condenser component; 17 - Wave plate;

[0029] 61 - Projection screen; 62 - Projection device. Detailed implementation manners

[0030] To make the objectives, technical solutions, and advantages of the present disclosure clearer and more understandable, the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that the implementation manners can be implemented in multiple different forms. Those of ordinary skill in the art to which the present disclosure pertains can easily understand the fact that the manners and contents can be transformed into various forms without departing from the gist and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited only to the contents described in the following implementation manners. Without conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other arbitrarily.

[0031] In the accompanying drawings, sometimes for clarity, the sizes, thicknesses of layers, or regions of the respective components are exaggerated. Therefore, one manner of the present disclosure is not necessarily limited to such sizes, and the shapes and sizes of the components in the drawings do not reflect the true proportions. In addition, the accompanying drawings schematically show ideal examples, and one manner of the present disclosure is not limited to the shapes or values shown in the drawings, etc.

[0032] The ordinal numbers such as "first", "second", "third", etc. in this specification are set to avoid confusion of components, rather than to limit the quantity.

[0033] In this specification, for convenience, terms indicating orientation or positional relationship such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are used to describe the positional relationship of components with reference to the accompanying drawings. This is only for the convenience of describing this specification and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present disclosure. The positional relationship of components changes appropriately according to the directions describing each component. Therefore, it is not limited to the terms described in the specification and can be replaced appropriately according to the circumstances.

[0034] In this specification, unless otherwise clearly specified and limited, the terms "install", "connect", and "couple" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate member, or the communication inside two components. For those of ordinary skill in the art, the meanings of the above terms in the present disclosure can be understood according to the actual situation.

[0035] 3D projection technology sends different images to the left and right eyes of the viewer respectively. After being synthesized by the viewer's brain, the viewer can feel a three-dimensional picture. A projection device, also known as a projector, refers to a device that projects pictures, texts, or videos onto a predetermined area such as a screen, a wall, or a projection screen in a projection manner, so that the viewer can view the picture displayed on the predetermined area such as the screen, the wall, or the projection screen.

[0036] At present, 3D projectors can be mainly divided into three types: shutter 3D projectors, polarized light 3D projectors (also referred to as polarized 3D projectors or polarized 3D projectors) and chromatic aberration 3D projectors. Among them, chromatic aberration 3D projectors mainly use two sets of screens printed with two different colors, and the audience can see the three-dimensional effect through the matching chromatic aberration 3D glasses. For example, taking red and blue glasses as an example, the viewer can only see the red image under the red lens, and the viewer can only see the blue image under the blue lens. The different images seen by the two eyes of the viewer overlap in the brain to present a 3D stereoscopic effect. However, chromatic aberration 3D projectors are prone to inevitable ghosting, and the display effect is very poor. At present, they have basically been replaced by shutter 3D projectors and polarized light 3D projectors. The current shutter 3D projector (also known as DLP 3D projector) is mainly a high-end video glasses designed using shutter 3D display technology, which achieves 3D effect by increasing the refresh rate of the picture. However, the brightness of the shutter 3D projector is poor, which makes the viewer's eyes very easy to fatigue, and the structure of such high-end video glasses is very complicated, and the price is very high, and the battery life is very poor and needs to be charged frequently. For example, the DLP 3D projector is a digital micromirror (DMD) chip containing millions of light reflections, which accurately generates two images on the screen at the same time, and then fuses them through special 3D glasses to act on the left and right eyes respectively. The DMD cost is high, and the special 3D glasses are very complicated and expensive. The current polarized 3D projector is usually superimposed by multiple projectors (for example, two projectors), and a polarizer and corresponding glasses are provided in front of the projection lens. Sometimes, software is also needed to perform geometric correction of multiple projectors (for example, two projectors). There are problems such as complex structure, large size, poor portability, high manufacturing cost, and high precision requirements.

[0037] Figure 1 FIG. 1 is a schematic diagram of a structure of a projection device in an exemplary embodiment of the present disclosure. Figure 1 As shown, the projection device may include: a light emitting component 11, a light conversion component 12 and a projection lens 13, wherein:

[0038] The light emitting component 11 is configured to generate light;

[0039] The light conversion component 12 includes: a liquid crystal display (LCD) panel 14 located on the light-emitting side of the light-emitting component 11 and a polarized liquid crystal panel 15 located on the light-emitting side of the liquid crystal display panel 14. Among them, the liquid crystal display panel 14 is configured to alternately emit the light incident on the liquid crystal display panel 14 as the first linearly polarized light corresponding to the first image (for example, as the left-eye image) and the second linearly polarized light corresponding to the second image (for example, as the right-eye image), and the polarization direction of the first linearly polarized light is the same as the polarization direction of the second linearly polarized light; the polarized liquid crystal panel 15 is configured to alternately emit the first linearly polarized light and the second linearly polarized light incident on the polarized liquid crystal panel 15 as the third linearly polarized light corresponding to the first image and the fourth linearly polarized light corresponding to the second image, and the polarization direction of the third linearly polarized light is perpendicular to the polarization direction of the fourth linearly polarized light;

[0040] The projection lens 13 is configured to alternately project the third linearly polarized light and the fourth linearly polarized light onto a predetermined area.

[0041] In an exemplary embodiment, the predetermined area may include but is not limited to a wall surface, a curtain, or a projection screen, etc. Here, the embodiments of the present disclosure do not make any limitations in this regard.

[0042] In this way, in the projection device provided by the embodiments of the present disclosure, by performing light splitting on the incident light through the liquid crystal display panel, the first linearly polarized light and the second linearly polarized light with the same polarization direction and alternately emitted can be obtained. By performing polarization processing on the first linearly polarized light and the second linearly polarized light with the same polarization direction through the polarized liquid crystal panel, the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions and alternately emitted can be obtained. By projecting the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions and alternately emitted onto a predetermined area (such as a projection screen or a curtain, etc.) through the projection lens, in this way, polarized 3D projection can be realized. Thus, on the light-emitting side of the light-emitting component, by applying the liquid crystal display panel and the polarized liquid crystal panel arranged front and back, based on the liquid crystal polarization effect, a good 3D projection display effect can be achieved only with a set of optical path systems (that is, only one projection device), the structure is relatively simple, the size of the 3D projection device can be effectively reduced, the cost of the 3D projection device can be reduced, the portability of the 3D projection device can be enhanced, and a projection device with a relatively simple structure, a small size, high portability, and a low cost can be realized.

[0043] In an exemplary embodiment, such as Figure 1As shown, the display liquid crystal panel 14 may include: a first array substrate (i.e., a thin film transistor (TFT) substrate) 141 and a color filter (CF) substrate 142 which are arranged in a cell, a first liquid crystal layer 143 located between the first array substrate 141 and the color filter substrate 142, a first polarizer 144 located on a side of the first array substrate 141 away from the first liquid crystal layer 143, and a second polarizer 145 located on a side of the color filter substrate 142 away from the first liquid crystal layer 143, wherein the transmission axis of the first polarizer 144 is perpendicular to the transmission axis of the second polarizer 145. Thus, through the first polarizer 144, the first liquid crystal layer 143, and the second polarizer 145, the light incident on the display liquid crystal panel 14 can be modulated into a first linearly polarized light and a second linearly polarized light with the same polarization direction and alternately emitted.

[0044] In an exemplary embodiment, as Figure 1 shown, the polarized liquid crystal panel 15 may include: a second array substrate 151 and a transparent substrate 152 which are arranged in a cell, and a second liquid crystal layer 153 located between the second array substrate 151 and the transparent substrate 152. It can be seen that compared with the structure of the display liquid crystal panel, the color filter substrate, the first polarizer, and the second polarizer may not need to be provided in the polarized liquid crystal panel.

[0045] In an exemplary embodiment, the material of the transparent substrate may be glass. For example, the transparent substrate may be a glass substrate.

[0046] In an exemplary embodiment, through the second liquid crystal layer, the polarized liquid crystal panel can deflect the polarization direction of one of the first linearly polarized light and the second linearly polarized light alternately incident on the polarized liquid crystal panel by 90°, and keep the polarization direction of the other linearly polarized light unchanged. Thus, the polarized liquid crystal panel can alternately emit a third linearly polarized light and a fourth linearly polarized light with perpendicular polarization directions.

[0047] In an exemplary embodiment, the projection device can switch the working mode of the projection device between the 3D projection mode and the 2D projection mode by controlling the polarization liquid crystal panel to switch between on and off. In this way, the projection device can achieve switchable ordinary 2D projection display and stereoscopic 3D projection display. For example, when the working mode of the projection device is switched to the 2D projection mode, the projection device can turn off the polarization liquid crystal panel. At this time, the projection lens can project the first linearly polarized light and the second linearly polarized light with the same polarization direction to a predetermined area (such as a projection screen or a curtain, etc.). In this way, the projection device can achieve an ordinary 2D projection display effect. For example, when the working mode of the projection device is switched to the 3D projection mode, the projection device can turn on the polarization liquid crystal panel. At this time, the polarization liquid crystal panel can modulate the first linearly polarized light and the second linearly polarized light with the same polarization direction into the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions, and alternately emit them to the projection lens. At this time, the projection lens can project the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions to a predetermined area (such as a projection screen or a curtain, etc.). In this way, the projection device can achieve a 3D projection display effect. It can be seen that the projection device in the embodiments of the present disclosure not only has a simple structure, a small volume, and a low cost, but also can achieve switchable ordinary 2D projection and stereoscopic 3D projection display, and has relatively rich functions.

[0048] In an exemplary embodiment, liquid crystal has optical birefringence characteristics. The refractive indices of the liquid crystal respectively include the ordinary light refractive index no (which can also be called the normal refractive index or the refractive index of the ordinary light) and the extraordinary light refractive index ne (which can also be called the abnormal refractive index or the refractive index of the extraordinary light). For example, one or more of the first liquid crystal layer and the second liquid crystal layer may include: a liquid crystal material with an ordinary light refractive index no of about 1.5 and an extraordinary light refractive index ne of about 1.8.

[0049] In an exemplary embodiment, the material of one or more of the first liquid crystal layer and the second liquid crystal layer may be a nematic liquid crystal material, a cholesteric liquid crystal material, a smectic liquid crystal material, etc. Here, the embodiments of the present disclosure do not make any limitations in this regard. Their common point is that applying an electric field can adjust the optical axis orientation of the liquid crystal molecules to form a liquid crystal grating. By adjusting the magnitude of the applied electric field, the refractive index of the liquid crystal grating can be arbitrarily adjusted, thereby changing the diffraction characteristics of the liquid crystal grating.

[0050] In an exemplary embodiment, the liquid crystal molecules in the first liquid crystal layer may be liquid crystals driven by a vertical electric field. The display liquid crystal panel may further include: a first electrode and a second electrode located on one side or both sides of the first liquid crystal layer. Thus, a vertical electric field can be formed by applying a voltage to the first electrode and the second electrode, so that the liquid crystal molecules in the first liquid crystal layer are deflected under the control of the vertical electric field provided by the first electrode and the second electrode. Thereby, the linearly polarized light in the first direction incident on the first liquid crystal layer from the first polarizer is emitted as linearly polarized light in the second direction.

[0051] In an exemplary embodiment, the first electrode is a common electrode and the second electrode is a pixel electrode; or, the first electrode is a pixel electrode and the second electrode is a common electrode.

[0052] In an exemplary embodiment, the first electrode and the second electrode may include one or more of a monolithic electrode and multiple block electrodes. For example, the first electrode and the second electrode may both be monolithic electrodes. Thus, when a voltage is applied to the first electrode and the second electrode, a uniform vertical electric field can be applied to the first liquid crystal layer, thereby achieving precise control of light by the first liquid crystal layer.

[0053] In an exemplary embodiment, the first electrode and the second electrode may be transparent electrodes made of the same material. For example, the transparent electrode may be made of a transparent conductive oxide material such as indium tin oxide (ITO), indium zinc oxide (IZO), etc. For example, both the first electrode and the second electrode may be formed of ITO material. Thus, the light transmittance of the projection device can be higher.

[0054] In an exemplary embodiment, the display liquid crystal panel may be a vertical electric field type display panel.

[0055] In an exemplary embodiment, the display liquid crystal panel may be a transparent display panel.

[0056] In an exemplary embodiment, the liquid crystal molecules in the second liquid crystal layer may be liquid crystals driven by a vertical electric field. The polarized liquid crystal panel may further include: a third electrode and a fourth electrode located on one side or both sides of the second liquid crystal layer. Thus, a voltage can be applied to the third electrode and the fourth electrode to form a vertical electric field, so that the liquid crystal molecules in the second liquid crystal layer are deflected under the control of the vertical electric field provided by the third electrode and the fourth electrode. Thereby, the first linearly polarized light and the second linearly polarized light with the same polarization direction alternately incident on the second liquid crystal layer are alternately emitted as the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions.

[0057] In an exemplary embodiment, the third electrode is a common electrode and the fourth electrode is a pixel electrode; alternatively, the third electrode is a pixel electrode and the fourth electrode is a common electrode.

[0058] In an exemplary embodiment, the display area (Active Area, AA area) of the polarized liquid crystal panel corresponds to the display area of the display liquid crystal panel, and the size of the display area of the polarized liquid crystal panel can be greater than or equal to the size of the display area of the display liquid crystal panel. In this way, the light emitted by the light-emitting element can be effectively utilized to improve the projection display effect.

[0059] For example, the display liquid crystal panel and the polarized liquid crystal panel can have the same appearance size and functional size. For example, the shapes and sizes of the display liquid crystal panel and the polarized liquid crystal panel are the same, and the shapes and sizes of the display areas in the display liquid crystal panel and the polarized liquid crystal panel are the same. After the display liquid crystal panel and the polarized liquid crystal panel are aligned and bonded, the display area in the polarized liquid crystal panel can correspond to the display area in the display liquid crystal panel. Thus, the first linearly polarized light and the second linearly polarized light with the same polarization direction alternately emitted by the display liquid crystal panel can be provided to the display area in the polarized liquid crystal panel after being modulated by the display area in the display liquid crystal panel, so that the display area in the polarized liquid crystal panel can modulate the alternately emitted first linearly polarized light and second linearly polarized light to realize the alternately emission of the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions.

[0060] In an exemplary embodiment, the refresh frequency of the display liquid crystal panel and the refresh frequency of the polarized liquid crystal panel can be the same. In this way, with the synchronous refresh frequency, it is convenient to realize the interval deflection of the picture and achieve the 3D projection display effect.

[0061] For example, the refresh frequency of the display liquid crystal panel and the refresh frequency of the polarized liquid crystal panel can both be equal to 120 Hz (Hertz), or the refresh frequency of the display liquid crystal panel and the refresh frequency of the polarized liquid crystal panel can both be greater than 120 Hz. In this way, it is convenient to realize the interval deflection of the high-refresh-rate picture and achieve a better 3D projection display effect.

[0062] For example, taking the refresh frequencies of both the display liquid crystal panel and the polarized liquid crystal panel as 120 Hz, the light emitted by the light-emitting element can be modulated into approximately collimated parallel light after passing through a collimating light extraction component (for example, a Fresnel lens, also known as a thread lens). After passing through the display liquid crystal panel with a refresh frequency of 120 Hz, the first linearly polarized light corresponding to the first image (for example, the linearly polarized light corresponding to the left-eye picture) and the second linearly polarized light corresponding to the second image (for example, the linearly polarized light corresponding to the right-eye picture) can be alternately emitted in time division (that is, the display liquid crystal panel alternately emits the first linearly polarized light corresponding to the first image and the second linearly polarized light corresponding to the second image). Among them, the polarization direction of the first linearly polarized light corresponding to the first image (for example, the linearly polarized light corresponding to the left-eye picture) is the same as the polarization direction of the second linearly polarized light corresponding to the second image (for example, the linearly polarized light corresponding to the right-eye picture), and is the same as the light-emitting angle of the second polarizing sheet. The light-emitting time between the first linearly polarized light corresponding to the first image (for example, the linearly polarized light corresponding to the left-eye picture) and the second linearly polarized light corresponding to the second image (for example, the linearly polarized light corresponding to the right-eye picture) can differ by one one-hundred-and-twentieth of a second (i.e., 1 / 120 s). After the first linearly polarized light corresponding to the first image (for example, the linearly polarized light corresponding to the left-eye picture) and the second linearly polarized light corresponding to the second image (for example, the linearly polarized light corresponding to the right-eye picture) are alternately incident on the polarized liquid crystal panel with a refresh frequency of 120 Hz, the polarized liquid crystal panel can deflect the linearly polarized light within the next 1 / 120 s by 90° every 1 / 120 s. Therefore, the polarized liquid crystal panel can deflect only one of the first linearly polarized light corresponding to the first image (for example, the linearly polarized light corresponding to the left-eye picture) and the second linearly polarized light corresponding to the second image (for example, the linearly polarized light corresponding to the right-eye picture) by 90°, without affecting the other of the first linearly polarized light corresponding to the first image (for example, the linearly polarized light corresponding to the left-eye picture) and the second linearly polarized light corresponding to the second image (for example, the linearly polarized light corresponding to the right-eye picture). Next, the polarized liquid crystal panel can emit horizontally and vertically alternating linearly polarized light (that is, the polarized liquid crystal panel can alternately emit a third linearly polarized light and a fourth linearly polarized light with perpendicular polarization directions).Then, the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions can be converged into the projection lens after passing through the first condenser component, so that the projection lens projects the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions onto a predetermined area (such as a projection screen or a curtain, etc.), and then synchronously enters the viewer's glasses. Among them, the angle of one of the left and right lenses of the glasses is parallel to the transmission axis of the second polarizer (POL) in the display liquid crystal panel, and the angle of the other lens of the left and right lenses of the glasses is perpendicular to the transmission axis of the second polarizer (POL) in the display liquid crystal panel. Finally, the left and right eye images can enter the viewer's left and right eyes. Thus, the 3D projection display effect is achieved. In this way, on the light-emitting side of the light-emitting component, through the front and back arrangement of the display liquid crystal panel and the polarized liquid crystal panel, according to the optical characteristics of the polarized liquid crystal panel with a refresh rate of 120 Hz deflecting the 120 Hz image in a time-sharing manner, a 3D projection display with a single light source, a single lens, and a single optical path can be realized.

[0063] In an exemplary embodiment, the polarized liquid crystal panel can be fixedly connected to the light-emitting side of the display liquid crystal panel, and the installation method can include but is not limited to attachment, fixed connection, or spaced arrangement, etc. In this way, by the front and back arrangement of the fixed connection of the display liquid crystal panel and the polarized liquid crystal panel, the optical path of the 3D projector can be reduced, effectively solving the problems of large volume and high cost of the 3D projector.

[0064] In an exemplary embodiment, as Figure 1 and Figure 2 shown, the projection device may further include: a first condenser component 16. Among them, as Figure 1 shown, the first condenser component 16 can be disposed between the polarized liquid crystal panel 15 and the projection lens 13, and is configured to converge the light incident on the first condenser component 16 to the projection lens 13. Or, as Figure 2 shown, the first condenser component 16 can be disposed between the display liquid crystal panel 14 and the polarized liquid crystal panel 15, and is configured to converge the light incident on the first condenser component 16 to the polarized liquid crystal panel 15. In this way, the light utilization rate can be improved, and the 3D projection display effect can be improved.

[0065] In an exemplary embodiment, as Figure 1 shown, the light incident surface of the first condenser component 16 can be a curved surface structure, and the light exit surface of the first condenser component 16 can be a flat surface structure. For example, the first condenser component can be a Fresnel lens. Among them, as Figure 3 shown, the Fresnel lens can include: a central portion 31 corresponding to the circle at the center of the Fresnel zone and an annular portion 32 corresponding to the ring of the Fresnel zone.

[0066] In an exemplary embodiment, taking the first condenser component 16 as a Fresnel lens as an example, as Figure 1As shown, when the first condenser component 16 (i.e., the Fresnel lens) is disposed between the polarized liquid crystal panel 15 and the projection lens 13, for example, the deflection of the liquid crystal molecules in the second liquid crystal layer 153 of the polarized liquid crystal panel 15 is uniform, such that the refractive index of the second liquid crystal layer 153 can be less than the refractive index of the first condenser component 16 (i.e., the Fresnel lens). Thus, the light incident on the first condenser component 16 (i.e., the Fresnel lens) from the transparent substrate 152 in the polarized liquid crystal panel 15 converges on the incident light surface of the first condenser component 16 (i.e., the Fresnel lens). At this time, the first condenser component 16 (i.e., the Fresnel lens) can function as a converging lens, converging the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions alternately emitted from the second liquid crystal layer 153 onto the projection lens 13.

[0067] In an exemplary embodiment, as Figure 2 shown, taking the first condenser component 16 as a Fresnel lens as an example, when the first condenser component 16 (i.e., the Fresnel lens) is disposed between the display liquid crystal panel 14 and the polarized liquid crystal panel 15, for example, the deflection of the liquid crystal molecules in the first liquid crystal layer 143 of the display liquid crystal panel 14 is uniform, such that the refractive index of the first liquid crystal layer 143 can be less than the refractive index of the first condenser component 16 (i.e., the Fresnel lens). Thus, the light incident on the first condenser component 16 (i.e., the Fresnel lens) from the second polarizing sheet 145 in the display liquid crystal panel 14 converges on the incident light surface of the first condenser component 16 (i.e., the Fresnel lens). At this time, the first condenser component 16 (i.e., the Fresnel lens) can function as a converging lens, converging the first linearly polarized light and the second linearly polarized light with the same polarization direction alternately emitted from the second polarizing sheet 145 onto the polarized liquid crystal panel 15.

[0068] In an exemplary embodiment, as Figure 1 shown, the light emitting assembly 11 may include: a substrate substrate 111, a light emitting element 112 disposed on the substrate substrate, and a collimating light extraction component 113 located on the light emitting side of the light emitting element 112. Among them, the light emitting element 112 is configured to generate light; the collimating light extraction component 113 is configured to emit the light incident on the collimating light extraction component 113 as collimated light. Thus, through the collimating light extraction component 113, most of the light emitted by the light emitting element 112 can be collimated and emitted, effectively improving the light utilization rate of the light emitting element 112.

[0069] In an exemplary embodiment, as Figure 1 shown, the incident light surface of the collimating light extraction component 113 is a planar structure, and the light emitting surface of the collimating light extraction component 113 is a curved surface structure. For example, the collimating light extraction component may be a Fresnel lens. Among them, as Figure 3As shown, the Fresnel lens may include a central portion 31 corresponding to a circle at the center of the Fresnel zone and an annular portion 32 corresponding to an annulus of the Fresnel zone.

[0070] In one exemplary embodiment, taking the collimating light extraction component as a Fresnel lens as an example, the light-emitting element may be located at the focal point of the collimating light extraction component (i.e., the Fresnel lens). Here, according to the basic properties of the lens, the light rays emitted from the focal point can be collimated and emitted after passing through the collimating light extraction component (i.e., the Fresnel lens), and the collimation effect is optimal.

[0071] In one exemplary embodiment, the substrate may be a transparent substrate made of a transparent material. For example, the substrate may be a glass substrate. In this way, the light transmittance of the projection device can be higher.

[0072] In one exemplary embodiment, as Figure 1 shown, the light-emitting assembly 11 may further include a second condensing component 114 located between the light-emitting element 112 and the collimating light extraction component 113 and configured to converge the light rays emitted by the light-emitting element 112 to the collimating light extraction component 113.

[0073] In one exemplary embodiment, the shape of the second condensing component may be a part of a sphere, or the shape of the second condensing component may be a part of a cone. For example, as Figure 1 shown, in a plane perpendicular to the substrate 111, the cross-sectional shape of the second condensing component 114 may be an inverted trapezoid. Here, the embodiments of the present disclosure do not limit this.

[0074] In one exemplary embodiment, the surface of the second condensing component on the side close to the collimating light extraction component is coated with a reflective material. For example, the inner sidewall of the second condensing component is coated with a reflective material. In this way, when the large-angle light rays emitted by the light-emitting element are emitted to the surface of the second condensing component coated with the reflective material, they will be reflected back by the coated surface and emitted in the opposite direction again. After a limited number of reflections inside the second condensing component, the light rays emitted by the light-emitting element can only be emitted in a beam with a smaller divergence degree towards the direction close to the collimating light extraction component. In this way, the light efficiency of the light-emitting element can be improved.

[0075] In an exemplary embodiment, the light-emitting element may include a light-emitting diode (LED). For example, an LED with a relatively small size, such as a micro light-emitting diode (Micro LED) or a mini light-emitting diode (Mini LED), may be adopted to enable the light-emitting element to have a high degree of collimation. Among them, the number, size, arrangement manner, etc. of the light-emitting elements in the light-emitting assembly may be set by those skilled in the art according to the actual situation. Here, the embodiments of the present disclosure do not make any limitations in this regard.

[0076] In an exemplary embodiment, as Figure 4 shown, the projection device may further include a wave plate 17, located on the light-emitting side of the polarized liquid crystal panel 15, and configured to alternately emit the third linearly polarized light and the fourth linearly polarized light incident on the wave plate 17 as the first circularly polarized light and the second circularly polarized light, where the rotation directions of the first circularly polarized light and the second circularly polarized light are opposite. For example, the first circularly polarized light may be a right-handed circularly polarized light, and the second circularly polarized light may be a left-handed circularly polarized light.

[0077] In an exemplary embodiment, the wave plate may be a quarter-wave plate (also referred to as a 1 / 4 wave plate).

[0078] In an exemplary embodiment, the angle between the optical axis of the quarter-wave plate and the transmission axis of the second polarizer may be 45° (degrees).

[0079] Figure 5 For Figure 1 the 3D projection schematic diagram of the shown projection device, the following takes the Figure 1 shown projection device as a reference, and takes the light-emitting element as an LED light source and the transparent substrate as a glass substrate as an example, and combines Figure 5 to illustrate the working process of the projection device.

[0080] As Figure 5As shown, the light emitted by the LED light source first passes through the first polarizer of the display liquid crystal panel and can be changed into horizontally polarized light. Then, it passes through the first liquid crystal layer located between the first array substrate (also known as the TFT substrate) and the color filter substrate (also known as the CF substrate) of the display liquid crystal panel. The horizontally polarized light can be deflected by 90° and is emitted by the second polarizer of the display liquid crystal panel (that is, the display liquid crystal panel alternately emits the first linearly polarized light corresponding to the first image and the second linearly polarized light corresponding to the second image with the same polarization direction). Then, through the time-division deflection effect of the second liquid crystal layer located between the second array substrate of the polarized liquid crystal panel and the transparent substrate (for example, a glass substrate), the polarized liquid crystal panel can alternately emit vertically polarized light and horizontally polarized light in a time-division manner (that is, the polarized liquid crystal panel alternately emits the third linearly polarized light and the fourth linearly polarized light with perpendicular polarization directions), thereby achieving the effect of left and right eye polarized 3D display. Thus, the projection device provided by the embodiments of the present disclosure, through the front and rear arranged display liquid crystal panel and polarized liquid crystal panel, can achieve a good 3D projection display effect with only one set of optical path systems (that is, only one projection device), has a relatively simple structure, can minimize the volume of the 3D projector optical engine, reduce the optical path of the 3D projector optical engine, can effectively reduce the size of the 3D projection device, can reduce the cost of the 3D projection device, can enhance the portability of the 3D projection device, and realizes a projection device with a relatively simple structure, a small size, high portability and a low cost.

[0081] In an exemplary embodiment, the projection device may be a projection optical engine.

[0082] In an exemplary embodiment, the projection device may be: any product or component with display and projection functions such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a navigator, etc. Here, the embodiments of the present disclosure do not limit the type of the projection device. Other essential components of the projection device should be understood by those of ordinary skill in the art and will not be elaborated here, nor should they be regarded as a limitation to the present disclosure.

[0083] In addition, the projection device in the embodiments of the present disclosure may further include other necessary components and structures in addition to the above-mentioned light-emitting components, display liquid crystal panels and polarized liquid crystal panels, etc., such as pixel driving circuits, etc. Those skilled in the art can design and supplement accordingly according to the type of the display panel, which will not be elaborated here.

[0084] The embodiments of the present disclosure also provide a display system. Figure 6 It is a schematic structural diagram of the display system in the exemplary embodiments of the present disclosure, as Figure 6As shown, the display system may include: a projection screen 61 and the projection device 62 in one or more of the above embodiments. Among them, the projection screen 61 is located on the light-emitting side of the projection lens 13 and is configured to display a first image and a second image. Here, Figure 6 The shown display system is schematically illustrated with Figure 1 the structure of the shown projection device.

[0085] Figure 7 is a schematic optical path diagram of the display system in an exemplary embodiment of the present disclosure. Below, taking Figure 1 the structure of the shown projection device as a reference, taking the refresh frequency of the liquid crystal panel and the refresh frequency of the polarized liquid crystal panel as 120 Hz as an example, in combination with Figure 7 the working process of the display system in an exemplary embodiment of the present disclosure will be described.

[0086] As Figure 7As shown, the light emitted by the light-emitting element 112 can be modulated into approximately collimated parallel light after passing through the collimating light-gathering component 113 (e.g., a Fresnel lens). After passing through the display liquid crystal panel 14 with a refresh rate of 120 Hz, it can alternately emit the first linearly polarized light corresponding to the left-eye image and the second linearly polarized light corresponding to the right-eye image at different times. Among them, the polarization directions of the first linearly polarized light corresponding to the left-eye image and the second linearly polarized light corresponding to the right-eye image are the same (e.g., both the first linearly polarized light and the second linearly polarized light are horizontally polarized light). Next, the first linearly polarized light corresponding to the left-eye image and the second linearly polarized light corresponding to the right-eye image alternately enter the polarized liquid crystal panel 15 with a refresh rate of 120 Hz. The polarized liquid crystal panel 15 can deflect the linearly polarized light within the next 1 / 120 s by 90° every 1 / 120 s. Therefore, the polarized liquid crystal panel 15 can only deflect the first linearly polarized light corresponding to the left-eye image or the second linearly polarized light corresponding to the right-eye image by 90°, without affecting the other. Thus, the polarized liquid crystal panel 15 can alternately emit linearly polarized light that alternates horizontally and vertically at different times, that is, the polarized liquid crystal panel 15 can alternately emit the third linearly polarized light (e.g., vertically polarized light) corresponding to the left-eye image and the fourth linearly polarized light (e.g., horizontally polarized light) corresponding to the right-eye image at different times. Then, the vertical third linearly polarized light (e.g., vertically polarized light) corresponding to the left-eye image and the horizontal fourth linearly polarized light (e.g., horizontally polarized light) corresponding to the right-eye image can be converged onto the projection lens 13 through the first light-gathering component 16, and then projected onto the projection screen 61 through the projection lens 13. After the projection light is diffusely reflected by the projection screen 61, it can enter the viewer's glasses synchronously. Among them, the angle of the left lens in the viewer's glasses is parallel to the transmission axis of the second polarizer (POL) in the display liquid crystal panel, and the angle of the right lens of the glasses is perpendicular to the transmission axis of the second polarizer (POL) in the display liquid crystal panel. Finally, through the viewer's glasses, the left-eye and right-eye images can enter the viewer's left and right eyes. Thus, a 3D projection display effect is achieved. In this way, through the front-to-back arranged display liquid crystal panel and polarized liquid crystal panel, according to the optical characteristics of the polarized liquid crystal panel with a refresh rate of 120 Hz deflecting the 120 Hz image at different times, a 3D projection display system with a single light source, a single lens, and a single optical path can be realized.

[0087] For the technical details not disclosed in the embodiments of the display system of the present disclosure, those skilled in the art can refer to the description in the embodiments of the projection device of the present disclosure for understanding, and will not be elaborated here.

[0088] Although the embodiments disclosed in the present disclosure are as above, the above content is only an embodiment adopted for the convenience of understanding the present disclosure and is not intended to limit the present disclosure. Any person skilled in the art within the scope of the present disclosure may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the present disclosure. However, the scope of patent protection of the present disclosure shall still be subject to the scope defined by the appended claims.

Claims

1. A projection device, characterized in that, Comprising: A light-emitting component, a light conversion component, and a projection lens, wherein, The light-emitting component is configured to generate light; The light conversion component includes a display liquid crystal panel on the light-emitting side of the light-emitting component and a polarizing liquid crystal panel on the light-emitting side of the display liquid crystal panel. The refresh frequencies of the display liquid crystal panel and the polarizing liquid crystal panel are the same and are greater than or equal to 120 Hz. Wherein, The display liquid crystal panel is configured to alternately emit the light incident on the display liquid crystal panel as the first linearly polarized light corresponding to the first image and the second linearly polarized light corresponding to the second image in a time-sharing manner. The polarization direction of the first linearly polarized light is the same as that of the second linearly polarized light and is the same as the light-emitting angle of the second polarizer; The light-emitting time difference between the first linearly polarized light corresponding to the first image and the second linearly polarized light corresponding to the second image is 1 / 120 s; The polarizing liquid crystal panel is configured to deflect the linearly polarized light within the next 1 / 120 s by 90° every 1 / 120 s, and only deflect one of the first linearly polarized light corresponding to the first image and the second linearly polarized light corresponding to the second image by 90°, without affecting the other of the first linearly polarized light corresponding to the first image and the second linearly polarized light corresponding to the second image. Thus, the first linearly polarized light and the second linearly polarized light incident on the polarizing liquid crystal panel are alternately emitted as the third linearly polarized light corresponding to the first image and the fourth linearly polarized light corresponding to the second image in a time-sharing manner. The polarization direction of the third linearly polarized light is perpendicular to that of the fourth linearly polarized light; The projection device is configured to control the switching between on and off of the polarizing liquid crystal panel to control the switching of the working mode of the projection device between the 3D projection mode and the 2D projection mode; The projection lens is configured to alternately project the third linearly polarized light and the fourth linearly polarized light to a predetermined area when the working mode of the projection device is switched to the 3D projection mode; Or, when the working mode of the projection device is switched to the 2D projection mode, project the first linearly polarized light and the second linearly polarized light to the predetermined area.

2. The device according to claim 1, characterized in that, The display liquid crystal panel includes a first array substrate and a color filter substrate arranged in a cell, a first liquid crystal layer located between the first array substrate and the color filter substrate, a first polarizer located on the side of the first array substrate away from the first liquid crystal layer, and a second polarizer located on the side of the color filter substrate away from the first liquid crystal layer. Wherein, the transmission axis of the first polarizer is perpendicular to the transmission axis of the second polarizer; The polarizing liquid crystal panel includes a second array substrate and a transparent substrate arranged in a cell, and a second liquid crystal layer located between the second array substrate and the transparent substrate.

3. The device according to claim 1 or 2, characterized in that The display area of the polarizing liquid crystal panel corresponds to the display area of the display liquid crystal panel, and the size of the display area of the polarizing liquid crystal panel is greater than or equal to the size of the display area of the display liquid crystal panel.

4. The device according to claim 1, characterized in that, Further comprising: A first condenser component, located between the polarizing liquid crystal panel and the projection lens, is configured to converge the light incident on the first condenser component to the projection lens; Alternatively, it is located between the display liquid crystal panel and the polarizing liquid crystal panel and is configured to converge the light incident on the first condenser component to the polarizing liquid crystal panel.

5. The device according to claim 4, characterized in that, Wherein, The light incident surface of the first condenser component is a curved surface structure, and the light exit surface of the first condenser component is a flat surface structure.

6. The device according to claim 5, characterized in that, The light-emitting component includes: a substrate, a light-emitting element disposed on the substrate, and a collimating light-extracting component located on the light exit side of the light-emitting element. Among them, the collimating light-extracting component is configured to emit the light incident on the collimating light-extracting component as collimated light.

7. The device according to claim 6, characterized in that, The light incident surface of the collimating light-extracting component is a flat surface structure, and the light exit surface of the collimating light-extracting component is a curved surface structure.

8. The device according to claim 7, characterized in that, One or more of the first condenser component and the collimating light-extracting component are Fresnel lenses. The Fresnel lens includes: a central portion corresponding to a circle at the center of the Fresnel zone and an annular portion corresponding to an annulus of the Fresnel zone.

9. The device according to claim 6, wherein The light-emitting component further includes: a second condenser component, located between the light-emitting element and the collimating light-extracting component, and is configured to converge the light emitted by the light-emitting element to the collimating light-extracting component.

10. The device according to claim 9, wherein, The shape of the second condenser component is a part of a sphere or a part of a cone, and a reflective material is coated on the side of the second condenser component close to the collimating light-extracting component.

11. The device according to claim 1, characterized in that, Further included: A wave plate, located on the light exit side of the polarizing liquid crystal panel, is configured to alternately emit the third linearly polarized light and the fourth linearly polarized light incident on the wave plate as a first circularly polarized light and a second circularly polarized light, wherein the rotation directions of the first circularly polarized light and the second circularly polarized light are opposite.

12. The device according to claim 11, characterized in that, The wave plate is a quarter-wave plate.

13. A display system, characterized in that, Including: A projection screen and the projection device according to any one of claims 1 to 12, wherein the projection screen is located on the light exit side of the projection lens and is configured to display a first image and a second image.

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