TWI385467B - Optical projection screen - Google Patents

Description

Optical projection screen

The invention relates to a screen, in particular to an optical projection screen with good light resistance, high black and white contrast, high gain, and a half gain angle of view of up to 175 degrees.

Referring to FIG. 1, the projection screen 1 is generally used in a movie theater, a conference room, a home theater, and a projection light 12 from a projector 11 is presented on the projection screen 1 by means of diffusion or reflection. When the direction of the projection light 12 is fixed and the luminous flux is constant, the ratio of the brightness of the diffused and reflected light beam of the projection screen 1 to the projected light 12 is referred to as the projection screen 1 gain value (Gain). In the horizontal direction, the gain value of the projection screen 1 is gradually decreased from the center outward, and an angle at which the half gain value (Half Gain) is viewed is defined as a half gain angle θ.

Since the general projection screen 1 is easy to diffuse or reflect other light sources around, it is necessary to obtain a better visual effect in a darker environment during projection, but it is difficult for the audience to use a pen and paper for teaching or conference room occasions. The text is therefore further improved by the industry.

Referring to FIG. 2, there is a US Patent No. 6,747,796, which discloses a technique for coating a surface of a body 10 of a projection screen 1 with a layer of micro-glass bead particles 13 using the micro-glass beads. The refracting circular surface of 13 refracts a certain projection light onto the viewer to increase the gain value of the projection screen 1, but also because of its round surface structure, it is easy to refract other external light, so that the half gain angle of the projection screen 1 is about 40 Between ~70 degrees, not only can the viewing angle become narrow, but also cannot be used in a large number of occasions. .

Therefore, the prior art does have the following serious drawbacks:

First, the light resistance is poor

The conventional projection screen 1 is easy to diffuse or reflect other light sources around, so that it is necessary to obtain a better visual effect in a darker environment during projection, so that the light resistance is poor.

Second, the gain is high but the angle of view is narrow

Although the US Patent No. 6,747,796 can improve the gain value of the conventional projection screen 1 to improve its light resistance, it is also easy to refract other external light due to its round surface structure, so that the viewing angle is between 40 and 70 degrees. The value has a significant increase, so the angle of view becomes quite narrow.

Third, the use of the environment is limited

As described above, since the viewing angle is narrow, it is not suitable for use in an audience environment where the audience is scattered. Therefore, the versatility of the projection screen 1 is poor, and it is difficult to meet different usage requirements.

Fourth, low black and white contrast

Due to the reflection and refraction of external light, and the function of increasing color saturation and black-and-white contrast, the images presented are low color saturation and low black and white contrast.

Accordingly, it is an object of the present invention to provide an optical projection screen that has good light resistance, high gain, high color saturation, and a half gain viewing angle of up to 175 degrees.

Thus, the optical projection screen of the present invention comprises a base film, a lens layer, a reflective layer, a surface film, a diffusion layer, a base film, and a second pressure sensitive adhesive layer.

The lens layer is formed on the base film and has a plurality of microlens structures. The reflective layer is formed on the lens layer for reflecting an incident light and changing the angle to a reflected light. The surface film is located on the reflective layer and has a high light transmittance and allows the reflected light to pass through. The diffusion layer is formed on the surface film, and the surface has an unevenness and anti-glare and anti-scratch effect, and the diffusion layer has a plurality of nano-grade black particles. The base film is located at the bottom of the base film and has a coating portion adjacent to the base film and opaque, and a protective portion connected to the coating portion. The pressure sensitive adhesive layer is respectively located between the base film and the base film, and between the reflective layer and the surface film, the pressure sensitive adhesive layer has a high light transmittance for bonding the bottom film and the a base film, and the reflective layer and the surface film.

The beneficial effect of the invention is that the reflective layer changes the angle of incident light from the projector and reflects it as an outgoing light, and expands the reflection angle of the reflected light by the convex mirror principle, and simultaneously increases the gain value, and then uses the surface of the diffusion layer. It has uneven shape, which makes the emitted light diffuse, increases the viewing angle and high color saturation, and can avoid the interference of external light. Therefore, the light resistance is good, the gain is high, and the viewing angle of the half gain value can reach 175 degrees or more. Therefore, high versatility can meet different use occasions.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Referring to Figures 3 and 4, a preferred embodiment of the optical projection screen 200 of the present invention is shown. The preferred embodiment comprises a base film 2, a base film 3 at the bottom of the base film 2, a lens layer 4 formed on the base film 2, and a reflective layer 5 formed on the lens layer 4. a surface film 6 on the reflective layer 5, a diffusion layer 7 formed on the surface film 6, an anti-glare scratch-resistant layer 72 formed on the diffusion layer 7, and two on the base film 2 and The base film 3 and the pressure sensitive adhesive layer 8 between the reflective layer 5 and the surface film 6.

The base film 3 has a coating portion 31 adjacent to the base film 2 and opaque, and a protective portion 32 connected to the coating portion 31. The coating portion 31 can prevent the incident light 91 from penetrating through the base film 2 to cause light loss, and avoid the light from the back surface of the optical projection screen 200 from affecting the projection effect. At the same time, the protection portion 32 has a non-stick stain. The advantages of cleaning. A plurality of microlens structures 41 having a continuous arc shape are formed on the surface of the lens layer 4, and the pitch of the center positions of the adjacent two arcs is 10 μm to 100 μm.

The reflective layer 5 is made of a high reflectivity metal material and is selected from the group consisting of silver and aluminum highly reflective materials and having a thickness ranging from 10 nm to 100 nm. In this embodiment, the material of the reflective layer 5 is selected from the group consisting of silver, but not limited thereto, all of the high reflectivity metals should be included in the range. Because of the shape of the microlens structure 41, the reflective layer 5 is capable of reflecting the incident light 91 and changing the angle to an outgoing light 92 while increasing the gain value of the outgoing light 92.

The surface film 6 has a high light transmittance and allows the emitted light 92 to be permeable. The surface of the diffusion layer 7 has irregularities and irregularities, and has black particles 71 having a majority of nanometer order and accounting for 0.1% to 1% by volume. The anti-glare scratch-resistant layer 72 The anti-glare scratch-resistant layer 72 is applied to the surface of the diffusion layer 7 by a microstructure forming technique, and the surface is also uneven. When the outgoing light 92 passes through the diffusion layer 7, the black-and-white contrast and color saturation of the emitted light 92 can be adjusted by taking the percentage of the volume occupied by the black particles 71 to meet different needs. In addition, the uneven surface of the anti-glare scratch-resistant layer 72 is used to diffuse and emit the emitted light 92, and the viewing angle is increased, and the external light can be simultaneously reduced into the diffusion layer 7 to avoid external light interference, and has scratch resistance. effect.

In particular, if the ratio of the black particles 71 is too large (>1%), the emitted light 92 becomes relatively dim, and if the ratio of the black particles 71 is too small (<0.1%), the emitted light 92 will The proportion and size of the nano-grade black particles 71 in FIG. 3 are only for convenience of labeling and description, and are not drawn in actual proportion and size.

The pressure sensitive adhesive layer 8 is located between the base film 3 and the base film 2, and between the reflective layer 5 and the surface film 6, and also has high light transmittance for facilitating adhesion and formation of the multilayer film. .

Since the base film 3, the base film 2 and the surface film 6 are all made of a flexible material, the optical projection screen 200 of the present invention can be bent and retracted, is easy to be stored, carried, and can be assembled into a variety of aspects. Used in response to different environments.

Referring to FIG. 5, a gain/view data comparison diagram is shown. Before the description, it should be noted that in the horizontal direction, the gain value of the optical projection screen 200 gradually decreases from the center outward, and a half-gain value can be defined. The angle of Half Gain) is a half gain angle of view.

Here, in FIG. 5, the X axis represents the angle of view, and the Y axis represents the gain value. According to the measured results of the inventor of the present invention, the general optical screen, when the gain is increased, the viewing angle is relatively gradually reduced. For example, at the gain value of 4, the half gain viewing angle is only about 30 degrees (±15 degrees). However, the structural design of the optical projection screen 200 of the present invention can increase the gain value to 3.5, but the half gain viewing angle can still reach 175 degrees (±87.5 degrees) or more.

As can be seen from the above description, the preferred embodiment of the optical projection screen 200 of the present invention does have the following advantages:

First, anti-scratch and good light resistance

The surface of the anti-glare scratch-resistant layer 72 of the present invention has an anti-scratch effect on the unevenness of the unevenness, and can reduce the entry of external light into the diffusion layer 7 to avoid interference of external light, so that the light resistance is good.

Second, the gain value is high, the picture contrast and color saturation are good

The optical projection screen 200 of the present invention can increase the gain value of the outgoing light 92 by using the reflective layer 5, and cooperate with the nano-scale black particles 71 incorporated in the diffusion layer 7, so that the outgoing light 92 has a bright black-and-white contrast. And color saturation.

Third, the perspective is large and highly versatile and easy to store and carry

When the outgoing light 92 of the optical projection screen 200 passes through the convex mirror principle of the reflective layer 5 and the uneven surface of the diffusing layer 7 and the anti-glare scratch-resistant layer 72, the emitted light 92 is diffused to the outside. It becomes larger, so whether the viewer is located directly in front of the optical projection screen 200 or scattered in a large angle orientation, it can be clearly viewed, and at the same time, by resisting light The advantage of sex, regardless of whether the environment is bright or not, is not affected. In addition, the base film 3, the base film 2, and the surface film 6 are all made of a flexible material, which can be bent and wound, and is easy to store and carry.

In summary, the optical projection screen 200 of the present invention reflects the incident light 91 from the projector into an outgoing light 92 by using the reflective layer 5, and the emitted light 92 increases the gain value and enlarges the reflection angle via the reflective layer 5. The surface of the diffusion layer 7 and the anti-glare scratch-resistant layer 72 is further uneven, so that the emitted light is diffused, the viewing angle is increased, and interference of external light is avoided, so that the light resistance is good, the gain is high, and half The viewing angle of the gain value can reach 175 degrees or more, and the diffusion layer 7 has the better black-and-white contrast and saturation of the emitted light 92, and can provide an increased viewing angle, anti-light, and scratch resistance, so that the present invention can be achieved. The purpose.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

200‧‧‧ optical projection screen

6‧‧‧Surface film

2‧‧‧base film

7‧‧‧Diffusion layer

3‧‧‧ base film

71‧‧‧Black particles

31‧‧‧ Paint Department

72‧‧‧Anti-glare scratch resistant layer

32‧‧‧Protection Department

8‧‧‧pressure layer

4‧‧‧ lens layer

91‧‧‧Incoming light

41‧‧‧Microlens structure

92‧‧‧Out of light

5‧‧‧reflective layer

1 is a perspective view showing the use of a conventional projection screen; FIG. 2 is a cross-sectional view showing a surface of a body of the projection screen coated with a plurality of microglass beads; FIG. 3 is a perspective view illustrating the optical body of the present invention DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT; FIG. 4 is a cross-sectional view showing the structure of each layer of the preferred embodiment; and FIG. 5 is a data diagram illustrating the function of the preferred embodiment.

200‧‧‧ optical projection screen

6‧‧‧Surface film

2‧‧‧base film

7‧‧‧Diffusion layer

3‧‧‧ base film

71‧‧‧Black particles

31‧‧‧ Paint Department

72‧‧‧Anti-glare scratch resistant layer

32‧‧‧Protection Department

8‧‧‧ Pressure sensitive adhesive

4‧‧‧ lens layer

91‧‧‧Incoming light

41‧‧‧Microlens structure

92‧‧‧Out of light

5‧‧‧reflective layer

Claims (7)

An optical projection screen comprising: a base film; a lens layer formed on the base film and having a plurality of microlens structures; a reflective layer coated on the lens layer and utilizing a convex mirror reflection principle to make an incident light Reflecting and forming a wider angle of reflected light; a surface film on the reflective layer having a high transmittance and allowing the reflected light to pass through; a diffusion layer formed on the surface film and having an uneven surface The diffusion layer is doped with a plurality of nano-grade black particles for improving black contrast and color saturation; a base film is located at the bottom of the base film, and the base film has an adjacent opaque film and is opaque a coating portion, and a protective portion connected to the coating portion; and a second pressure sensitive adhesive layer between the base film and the base film, and between the reflective layer and the surface film, the pressure sensitive adhesive layer has a high light transmittance for bonding the base film and the base film, and the reflective layer and the surface film. The optical projection screen of claim 1, wherein the lens layer has a microlens structure of a plurality of continuous arc shapes, and a center of the adjacent two arcs has a pitch of 10 μm to 100 μm. The optical projection screen of claim 1, wherein the black particles of the diffusion layer account for 0.1% to 1% by volume. The optical projection screen according to item 1 of the patent application scope also includes An anti-glare scratch-resistant layer is formed on the surface of the diffusion layer by a microstructure forming technique, and the surface of the anti-glare scratch-resistant layer is uneven. The optical projection screen of claim 2, wherein the reflective layer is made of a high reflectivity metal and has a thickness ranging from 10 nm to 100 nm. The optical projection screen of claim 5, wherein the reflective layer is made of a material selected from the group consisting of silver or aluminum. According to the optical projection screen of claim 6, wherein the base film, the base film and the surface film are made of a flexible material, which can be bent and wound, and is easy to be stored and carried.