JPH03246532A - Reflection type screen - Google Patents

Abstract

PURPOSE:To improve brightness and contrast and to obtain a sharp projected picture by forming the reflecting layer of a high-reflectivity ink on a black plastic film or sheet in a specified pattern by printing or coating. CONSTITUTION:The reflecting layer of a high-reflectivity ink is formed on a black plastic film or sheet in a specified pattern by printing or coating. A high-reflectivity material is preferably used for the reflecting layer to enhance the reflection brightness of a screen and to cover the darkness due to the black part. Accordingly, the black color of the film or sheet as the substrate is partially exposed on the surface. Consequently, the action of a black matrix is emphasized, the reflection brightness is improved, and a high-contrast projected picture is obtained.

Description

[Detailed Description of the Invention] <Industrial Application Field> In recent years, projection televisions using liquid crystal panels, etc. have appeared on the market, but it is necessary to increase the brightness of the light source.
There is a limit and in order to get a bright image on the screen,
There has been an increasing demand for brighter screens with better reflective properties than conventional screens.

The present invention relates to a reflective screen suitable for viewing a projected image of a projection television and a method for manufacturing the same.

<Prior Art> In order to view the projected image reflected on the screen as a bright image, the following is a prior art that improves the light reflection layer on the surface of the screen.

(1) Paste ink filled with AI scales is printed on the surface of the base material to form a light reflective layer (Patent Application No.
No. 236561) (2) A light-reflecting layer formed by printing an ink containing pearl pigment scales made of mica coated with titanium dioxide as a filler on the surface of a base material, (Patent Application No. 1999)
-236562) <Problems to be Solved by the Invention> In a reflective screen, it is possible to improve the reflective brightness and obtain a bright image, as well as improve the contrast.
Obtaining clear images is also an important factor.

According to the prior art described above, although a bright image can be obtained,
No consideration is given to increasing the contrast, and the image is not necessarily satisfactory.

The present invention aims to provide a screen that improves both brightness and contrast so that sharp projected images can be viewed.

<Means for Solving the Problems> The present invention comprises printing and coating a black plastic film or sheet with a highly reflective ink in a predetermined pattern as a light reflecting layer. It features a reflective screen.

<Detailed Description of the Invention> In a reflective screen, the contrast when projecting an image is given by the following equation.

To increase the brightness contrast of the brightest areas on the screen, brighten the projector's light source and
The numerator of the above equation can be made larger, but if this is done, the denominator of the above equation becomes entangled and becomes larger, which does not result in high contrast.

The present inventors believe that in order to increase the contrast on the screen, the area other than the light emitting part should be made matte black, in the same way as the contrast on the CRT of a TV receiver.
In other words, I found out that the denominator of the above equation should be made smaller.

When the area of the black part on the screen surface increases, the area of the part that reflects during projection decreases, resulting in a dark screen.

As a result of extensive studies, it has been found that it is visually preferable to make the black portion 20% and the light reflective layer portion 80% of the screen surface area.

The configuration of the reflective screen according to the present invention will be explained.

A soft P9C (vinyl chloride) resin is suitable for the black plastic film or sheet serving as the screen base material, and a matte black color is desirable.

The amount of plasticizer added to the resin is 40 parts or less in consideration of suitability for printing and coating (hereinafter, in the specification of this application, parts means the amount of plasticizer added = percentage). ) is desirable.

As the light-reflecting layer, a material with high light-reflectivity is desirable in order to increase the reflective brightness of the screen and cover the darkness caused by the black portion.

Since it is necessary to form a predetermined pattern, the ink is suitable for printing and coating suitability, and as a composition with high light reflection, (1) non-leafing type Al scales with a particle size of 5 um to 50 um (average particle size 13 μm) are used. Paste ink as a filler.

(2) An ink containing pearl pigment scales obtained by coating mica with titanium dioxide, with a coverage of 28% and a particle size of 5 μm to 60 μm (average particle size of 30 μm) as a filler.

is appropriate.

In order to form the light reflecting layer in a predetermined pattern, a patterned plate is used as a printing plate for ink printing.

Examples of patterns include a regular pattern where the areas where ink is not printed are grid-like (hatched areas) as shown in Figure 2, and patterns where the areas where ink is printed are random as shown in Figure 3. Although it is possible, the pattern is not limited to these. However, in this case, the aperture ratio (the ratio of the area of the part where ink is printed to the total surface area of the screen) is required to be about 80%.

In addition, after forming the light reflection layer, if necessary, in order to protect the surface and stabilize the clear viewing angle, an OP varnish containing silica powder or the like may be coated to correspond to the light reflection layer. Also good.

<Function> Since the screen according to the present invention has the black color of the plastic film or sheet as the base material partially exposed on the surface, it functions as a black matrix, and the contrast can be improved during image projection.

<Example><Example1> Black PVC film (23 parts,
A light reflective layer was formed on the surface of the screen (manufactured by Riken Vinyl) using the ink and printing conditions shown below to prepare a screen sample.

(Sample No. 4) A1 paste ink salt vinyl acetate resin 20 parts by weight AI paste 7 〃MEK/) Luene-1/1
73 〃 Total 100 ・Printing conditions: grid engraving gravure plate with cell depth of 45 μm; aperture ratio: 80%;
The A1 paste is 708 manufactured by Toyo Aluminum Co., Ltd.
Using ON, finely pulverize in a ball mill for 48 hours,
The distribution of 0 particle sizes with an average particle size of 13 μm is 7 μm to 44 μm.
It was μm.

<Example 2> Example 1 except that the ink shown below was used.
A screen sample was obtained in the same manner. (Sample No. 5) ・Pearl pigment ink Salt vinyl acetate resin 20 parts by weight Pearl pigment
25 〃MEK/) Luen = 1/1
55 Total 100 〃 The pearl pigment is (manufactured by Merck Co., Ltd., Merck Japan Co., Ltd.)
) Titanium dioxide coverage rate 28%, particle size 10 μm ~ 60 μm
m was used.

<Comparative Example> For comparison with the screen according to the present invention, the following sample was prepared.

(Sample No. 1) White PVC film (23 parts, made by Riken Vinyl) only.

(Sample No. 2) Transparent beads (made of glass, particle size 100 μm) were arranged on the negative side on the surface of Sample No. 1.

(Sample No. 3) A light reflecting layer was formed on the surface of Sample No. 1 in the same manner as in Example 2.

The optical properties of Samples 1 to 5 described above were examined in a dark place and a bright place, respectively. The results are shown in Table 1.2 below.

Table 1: Dark place (Lux 245) Table: Bright place (Lux 19) As can be seen from Tables 1 and 2, the screen according to the present invention (Sample No. 4.5) is different from the conventional technology (Sample No. 4.5).
, 1 to 3), there is a marked improvement in reflected brightness and contrast.

<Effects of the Invention> As explained above, according to the screen according to the present invention, a projected image with high reflected luminance and high contrast can be obtained.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view showing a reflective screen according to the present invention, and FIGS. 2 and 3 are explanatory views showing examples of patterns of a light-reflecting layer.

Claims (1)

[Claims] 1) A reflective screen characterized by forming a predetermined pattern of highly reflective ink as a light reflective layer on a black plastic film or sheet by printing and coating it. . 2) As an ink with high light reflectivity, the particle size is 5 μm to 50 μm.
2. The reflective screen according to claim 1, characterized in that a paste ink containing non-leafing type Al scales of m (average particle diameter 13 μm) as a filler is used. 3) As a highly light-reflective ink, pearl pigment scales are made by coating mica with titanium dioxide, with a coverage rate of 28%.
2. The reflective screen according to claim 1, wherein an ink containing a filler having a particle size of 5 μm to 60 μm (average particle size of 30 μm) is used.