Transparent screen, projection screen and projection display system

Abstract

The light-transmitting screen, projection screen and projection display system of the present patent application, the light-transmitting screen comprises: a main body, one side of which is a light-reflecting display surface for displaying images, and the other side is a light-absorbing surface provided with a dark light-absorbing material for absorbing light irradiated on the light-absorbing surface; a plurality of penetrating portions, which are arranged on the display surface to penetrate the main body; wherein the density of distribution of the plurality of penetrating portions on the display surface is between 30% and 80%, thereby effectively solving the problem of high-contrast display of front projection display, and also solving the problem of achieving high transmittance when viewing from the front and back.

Description

Technical Field

[0001] The present patent application relates to the field of projection imaging technology, and in particular to a light-transmitting screen, a projection screen and a projection display system. Background Art

[0002] The principle of front projection is that the person and the projector are on the same side, and the projected image is projected onto the surface of the front projection screen, and the image is reflected into the human eye before it can be seen. Limited by the special installation method of front projection imaging, the audience cannot see the objects on the back of the screen through the reflective screen. At present, there is a lack of a projection imaging device with high transmittance and high contrast display on the market.

[0003] Due to the requirements of the subway security system, subway screen door advertising displays are not widely popularized, screen door advertising is not prevalent, the surface of the screen doors is mostly left blank or only has safety warning signs pasted on it, the blank transparent area exceeds 85%, and it has not been effectively used.

[0004] Although there are schemes for projecting advertising content on subway screen doors, some projectors are set in the track area, which is humid and easy to damage the projector; moreover, these schemes do not take into account the safety of the screen doors when entering or exiting the subway station. In the projection state, users inside and outside the train cannot see each other and can only see each other when the screen doors are opened. In the case of crowded flow of people, ordinary people will not have time to react and avoid the impact of the flow of people when the screen doors are opened, which can easily cause accidents. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of this patent application is to provide a light-transmitting screen, a projection screen and a projection display system to solve the problems of the prior art.

[0006] To achieve the above objectives and other related objectives, the present patent application provides a light-transmitting curtain, comprising: a main body, one side of which is a light-reflecting display surface for displaying images, and the other side of which is a light-absorbing surface provided with a dark light-absorbing material for absorbing light irradiated on the light-absorbing surface; a plurality of penetrating portions, which are arranged on the display surface so as to penetrate the main body; wherein the density of the distribution of the plurality of penetrating portions on the display surface is between 30% and 80%.

[0007] In one embodiment of the present patent application, the light reflective display surface is coated with a projection reflective material.

[0008] In one embodiment of the present patent application, the RGB color intensity value of the color of the dark material is selected from the following range: R<220, G<220, B<220.

[0009] In one embodiment of the present patent application, the dark material is black.

[0010] In one embodiment of the present patent application, the plurality of penetration portions are holes.

[0011] In one embodiment of the present patent application, the surface gain of the light reflective display surface is greater than 1 times.

[0012] In one embodiment of the present patent application, the plurality of penetration portions are evenly distributed on the display surface.

[0013] In one embodiment of the present patent application, the plurality of penetration portions are distributed in an array on the display surface.

[0014] To achieve the above objectives and other related objectives, the present patent application provides a projection screen, comprising: the light-transmitting screen as described above; and a dimming screen attached to the back of the display surface of the light-transmitting screen, wherein the transparency of the dimming screen is adjustable.

[0015] In one embodiment of the present patent application, the dimming screen is liquid crystal glass.

[0016] To achieve the above objectives and other related objectives, the present patent application provides a projection display system, including: the light-transmitting screen or the projection screen; and a projection device.

[0017] To achieve the above objectives and other related objectives, the present patent application provides a projection display system, comprising: the projection screen, which is covered on one side of the subway platform door corresponding to the platform area, so that the display surface is set toward the platform area; a projection device, which is arranged in the platform area and is configured so that the projection direction is toward the display surface.

[0018] In one embodiment of the present patent application, the projection display system includes: a dimming screen controller, which is electrically connected to the dimming screen and is communicatively connected to a sensing device for sensing the entry and exit of a subway train and generating a corresponding electrical signal.

[0019] In one embodiment of the present patent application, the projection device is disposed above the subway platform screen door.

[0020] In one embodiment of the present patent application, the projection device is installed above the subway screen door via a hanging bracket.

[0021] In one embodiment of the present patent application, the projection device is a laser projector.

[0022] In one embodiment of the present patent application, the projection device is an ultra short-throw projector with a projection ratio less than 0.5:1.

[0023] As described above, the light-transmitting screen, projection screen and projection display system of the present patent application, the light-transmitting screen comprises: a main body, one side of which has an outer surface that is a light-reflecting display surface for displaying images, and the other side of which is a light-absorbing surface provided with a dark light-absorbing material for absorbing the light irradiated on the light-absorbing surface; a plurality of penetrating portions, which are arranged on the display surface so as to penetrate the main body; wherein the density of distribution of the plurality of penetrating portions on the display surface is between 30% and 80%, thereby effectively solving the problem of high-contrast display of front projection display, and also solving the problem of achieving high transmittance when viewing from the front and back. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a schematic structural diagram of the front side of the light-transmitting curtain in one embodiment of the present patent application.

[0025] Figure 2 Display as Figure 1 Schematic diagram of the structure on the back of the medium-transmittance curtain.

[0026] Figure 3 Shown is a structural schematic diagram of an application scenario of a light-transmitting screen or a projection screen in an embodiment of the present patent application.

[0027] Figure 4 Shown is a side structural schematic diagram of a projection display system in a subway scene according to an embodiment of the present patent application. DETAILED DESCRIPTION

[0028] The following describes the implementation of the present patent application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present patent application from the content disclosed in this specification. The present patent application can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present patent application. It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict.

[0029] The technical solution of this patent application is about the design of a projection display system, especially about the design of a projection screen.

[0030] like Figure 1 and 2 , which shows a schematic structural diagram of the front and back sides of the light-transmitting curtain 1 in one embodiment of the present patent application.

[0031] The light-transmitting screen 1 comprises: a body, which can be in the form of a sheet as shown in the figure, and its size can be set according to actual needs. One side outer surface of the body is a light-reflecting display surface for displaying images.

[0032] The body is provided with a plurality of penetration portions 11, which are arranged on the display surface so as to penetrate the body, that is, penetrate from the display surface to the back thereof. In this embodiment, the plurality of penetration portions 11 are holes, which may be circular in shape, and the hole diameter may be 0.5 to 1.5 mm; the plurality of penetration portions 11 are evenly distributed on the display surface, for example, distributed in an array as shown in the figure.

[0033] The density of the plurality of penetration portions 11 on the display surface is between 30% and 80%, which can be changed in actual design according to the actual environment. The applicant has conducted experiments and found that both high transmittance and high contrast imaging can be achieved within this density range.

[0034] like Figure 1 As shown, optionally, in order to achieve a better effect of both high transmittance and high contrast imaging, the light reflective display surface is coated with a projection reflective material, such as projection paint (which can be light-colored, i.e. white), and the surface gain of the light reflective display surface is more than 1 times, preferably can reach 1.2 times.

[0035] like Figure 2 As shown, the back of the display surface is coated with a dark material that absorbs light, and the RGB color intensity value of the color of the dark material is selected from the following range: R<220, G<220, B<220, and is preferably black. The reflectivity of black is low, and when the observer observes the person or object on the opposite side through the penetrating portion 11 from the back, the observer is less affected by the reflected light.

[0036] Figure 1 The light-transmitting screen 1 shown in the embodiment can be used for projection. To improve the brightness of the display surface, in other embodiments, the present patent application can also provide a projection screen, which includes: the light-transmitting screen; and a dimming screen, which is attached to the back of the display surface of the light-transmitting screen 1, wherein the transparency of the dimming screen is adjustable. Specifically, the light-transmitting screen and the dimming screen can be fixed by bonding with transparent adhesive.

[0037] It should be particularly noted that, in other embodiments, the light-transmitting curtain can be used alone and does not have to be used in combination with the dimming curtain.

[0038] In one embodiment of the present patent application, the dimming screen is a liquid crystal glass, preferably a film-shaped liquid crystal dimming film; the liquid crystal dimming film is a liquid crystal / polymer mixed material injected between two transparent conductive films. In the absence of an electric field, the liquid crystal dimming film is in an opaque state; when an alternating current is applied, the liquid crystal molecules are arranged in an orderly manner, and the electroluminescent dimming film is then converted from an opaque state (OFF state) to a transparent state (ON state). Through the action of the electric field, a rapid conversion from on state to off state, and off state to on state can be achieved. When in an atomized state, the projection screen of the projection device is projected onto the surface of the liquid crystal dimming film for front projection. At this time, the atomized surface can reflect a screen with a brightness of about 40%, and the audience can observe the front projection effect. However, due to the low reflectivity of the liquid crystal dimming film, the front projection imaging effect is extremely poor, the contrast is low, and it is easy to produce a hazy and unclear problem.

[0039] Therefore, in this embodiment of the present patent application, the dimming screen and the light-transmitting screen 1 are overlapped and used, and the dimming screen fills the vacancy of the penetration portion 11 in the atomized state, thereby increasing the brightness reflection by about 10%-20% on the basis of the original display brightness of the light-transmitting screen 1 used alone, thereby achieving a better front projection display effect.

[0040] like Figure 3 As shown, an application scenario is shown in which the light-transmitting curtain 1 (of course, in other embodiments, it can also be the above-mentioned projection screen, that is, a combination of the light-transmitting curtain 1 and the dimming curtain) is projected onto the display surface of the light-transmitting curtain 1 through a projection device 3 (such as a projector).

[0041] The display surface reflects the light from the projection device to display the image to the user A in front. The user B located behind the light-transmitting screen 1 or the projection screen can observe the person or object on the opposite side, such as user A, through the penetration portion 11. Of course, if a projection screen is used, user B can only observe user A when the dimming screen is in a transparent state.

[0042] Preferably, the projection device in the above embodiment is a laser projector. Further preferably, the projection device is an ultra-short-throw projector with a projection ratio of less than 0.5:1.

[0043] The projection screen 2 can be applied to, for example, a subway scene, such as Figure 4 As shown, a side structural diagram of a projection display system applied to a subway scene in an embodiment of the present patent application is shown.

[0044] The system comprises: a projection screen 2 and a projection device 3.

[0045] The projection screen 2 is covered on the subway screen door 4. In this embodiment, the subway screen door 4 has two opposite sides, and the two sides include: a first side facing the subway platform area 5 and a second side facing the track area 6. The projection screen 2 is covered on the first side. Specifically, the outer surface of the dimming screen in the projection screen 2 is covered on the first side.

[0046] The projection screen 2 can be attached to the subway screen door 4 by means of adhesion (for example, by electrostatic adsorption, adhesive, etc.). Preferably, the projection screen 2 can cover the entire glass of the screen door 4.

[0047] The projection device 3 is arranged in the subway platform area 5, and is arranged so that its projection direction is toward the display surface of the projection screen 2; wherein the light-transmitting screen and the dimming screen of the projection screen 2 are sequentially located on the optical path of the outgoing light projected therefrom.

[0048] Since the projection effect of the liquid crystal dimming film is not good, the present application utilizes the projection screen 2, that is, a screen composed of a light-transmitting screen and a dimming screen. The light-transmitting screen is mainly used in the front to achieve a better projection effect. The rear dimming screen becomes opaque when projection is needed to block the penetrating part of the light-transmitting screen to obtain a better projection effect.

[0049] Preferably, the projection device 3 is arranged above the shielding door 4. For example, it can be suspended above the shielding door 4 by a hanging bracket. The projection device 3 can preferably be the aforementioned laser projector, an ultra-short-throw projector with a projection ratio of less than 0.5:1.

[0050] In one embodiment of the present patent application, the system further includes: a dimming curtain controller, electrically connected to the dimming curtain, and communicatively connected to a sensing device for sensing the entry and exit of a subway train and generating a corresponding electrical signal, which can be arranged in a track area or a platform area. The sensing device may include a sensor, such as a position sensor arranged on the platform, which may be realized by a photoelectric light sensor, an infrared retro-reflector, a magnetic induction sensor, an ultrasonic sensor, etc.; it may also be a speed sensor (such as a linear velocity sensor or an angular velocity sensor) arranged on the train, etc., which is wirelessly connected to the dimming curtain controller connected to the wireless signal transceiver circuit of the same communication protocol by connecting to a wireless signal transceiver circuit (such as WiFi, Zigbee, NB-IOT, Lora, GPRS, 3G / G / G, etc.).

[0051] For example, when the train has not entered the station, the dimming screen is not powered on and is in an opaque state. It blocks the penetrating part of the light-transmitting screen behind the light-transmitting screen. At this time, the projection device 3 projects content such as advertisements on the light-transmitting screen; when the train enters the station, the dimming screen controller can generate an electrical signal to power on the dimming screen and control it to be transparent or opaque. When it changes to transparent, people in the train and on the platform can observe the situation inside and outside the train from each other and react in advance to avoid accidents caused by crowded flow of people when the shielding door 4 is opened.

[0052] In summary, the light-transmitting screen, projection screen and projection display system of the present patent application, the light-transmitting screen comprises: a main body, one side of which has an outer surface that is a light-reflecting display surface for displaying images, and the other side of which is a light-absorbing surface provided with a dark light-absorbing material for absorbing light irradiated on the light-absorbing surface; a plurality of penetrating portions, which are arranged on the display surface to penetrate the main body; wherein the density of distribution of the plurality of penetrating portions on the display surface is between 30% and 80%, thereby effectively solving the problem of high-contrast display of front projection display, and also solving the problem of achieving high transmittance when viewing from the front and back.

[0053] The above embodiments are merely illustrative of the principles and effects of this patent application, and are not intended to limit this patent application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of this patent application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in this patent application should still be covered by the claims of this patent application.

Claims

1. A projection display system, characterized in that: include: The projection screen comprises: a light-transmitting screen and a dimming screen; one side of the outer surface of the body of the light-transmitting screen is a light-reflecting display surface for displaying images, and the other side is a light-absorbing surface provided with a dark material for absorbing light irradiated on the light-absorbing surface; the projection screen is covered on a side of a subway screen door corresponding to a platform area, so that the display surface is arranged toward the platform area; A projection device is provided in the platform area, and is arranged so that the projection direction faces the display surface; A dimming screen controller, electrically connected to the dimming screen, and communicatively connected to a sensing device for sensing the entry and exit of a subway train and generating a corresponding electrical signal; Wherein, the light reflective display surface is coated with a projection reflective material; the surface gain of the light reflective display surface is more than 1 times; The light-transmitting screen further comprises: a plurality of penetration parts, which penetrate the body and are arranged on the display surface; the density of the plurality of penetration parts distributed on the display surface is between 30% and 80%; the plurality of penetration parts are evenly distributed on the display surface; The dimming screen is attached to the back of the display surface of the light-transmitting screen; the transparency of the dimming screen is adjustable; the dimming screen is liquid crystal glass, and the dimming screen fills the vacancy of the penetration part of the light-transmitting screen in the atomized state.

2. The projection display system according to claim 1, characterized in that: The RGB color intensity value of the color of the dark material is selected from the following ranges: R<220, G<220, B<220.

3. The projection display system according to claim 1, characterized in that: The dark material is black.

4. The projection display system according to claim 1, characterized in that: The plurality of penetrations are holes.

5. The projection display system according to claim 1, characterized in that: The plurality of penetration portions are distributed in an array on the display surface.

6. The projection display system according to claim 1, characterized in that: The projection device is arranged above the subway screen door.

7. The projection display system according to claim 6, characterized in that: The projection device is arranged above the subway screen door through a hanging bracket.

8. The projection display system according to claim 1, characterized in that: The projection device is a laser projector.

9. The projection display system according to claim 1, characterized in that: The projection device is an ultra-short-throw projector with a projection ratio of less than 0.5:1.

Images