JP2004326069A - Optical projector, its optical projection display member and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical projection display member capable of improving contrast and display efficiency and sharply reducing manufacturing costs and and shortening manufacturing time and to provide an optical projector capable of increasing display size and improving both of contrast and display efficiency. <P>SOLUTION: The optical projection display member comprises optical focusing structure, an optical panel and an optical absorption layer. The optical focusing structure has a plurality of micro optical focusing elements. The optical absorption layer is arranged between the optical focusing structure and the optical panel and provided with a plurality of optical transmission windows, and each of the optical transmission windows is allowed to correspond to each micro optical focusing element. The optical transmission windows are formed by an optical exposure/development method. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical projection device, an optical projection display member thereof, and a method of manufacturing the same, and more particularly, to an optical projection device having high contrast, an optical projection display member thereof, and a method of manufacturing the same.

  Current displays are showing a tendency to develop in the direction of thinning and enlargement.In such developments, projection displays have characteristics such as thin thickness and large dimensions. It is gradually replacing conventional televisions and becoming one of the mainstream products for display devices. Of the various types of projection displays, the back projection display is the most important.

In the current back projection display, the screen has the following main functional requirements.
(1) The viewing angle of the display is increased to increase the visible range.
(2) Protect the display so that the components inside the display are not affected by external dust or moisture.
(3) The contrast of the display is improved by controlling the reflection of external stray light.

  With the current screen manufacturing technology, the above requirements (1) and (2) can be easily achieved, but in order to achieve the higher effective light transmittance while simultaneously achieving the above requirement (3), the current screen needs to be It does not lead to the ideal effect.

  In general, current back projection display screens are achieved in the manner disclosed in U.S. Pat. No. 2,378,252. As shown in FIGS. 1 and 2, the screen 100 includes a light absorbing material layer 106 between the optical panel 102 and the optical sphere 104, and the light absorbing material layer 106 absorbs external stray light to prevent its reflection. At the same time, the angle of the light beam is enlarged by the optical sphere 104 and the optical panel 102 to increase the visible range.

  However, one innate limitation of this technique is that when incident light is incident at a vertical angle from behind, it can easily pass through the entire screen (as shown in FIG. 1). When a light beam enters at a fixed angle θ, it is easily absorbed by the light absorbing material layer 106, and the transmittance is reduced (as shown in FIG. 2). As can be seen from FIGS. 1 and 2, the larger the incident angle θ of the light beam, the larger the thickness of the light absorbing material layer 106 that faces (L1 in FIG. 1 and L2 in FIG. 2). It greatly reduces the overall efficiency and also affects the overall uniformity of the screen 100. As shown in FIG. 3, in the present technology, the above-described phenomenon cannot be ignored because the incident angle θ at which the light beam irradiates the screen 100 from the optical projection assembly 108 reaches 20 ° to 30 °.

  In order to solve the above problems, an object of the present invention is to provide an optical projection display member that simultaneously improves contrast and display efficiency.

  It is another object of the present invention to provide an optical projection display member that significantly reduces manufacturing cost and manufacturing time.

  In addition, another object of the present invention is to provide an optical projection device that further increases the display size and simultaneously improves the contrast and the display efficiency.

  In order to achieve the above object, the present invention provides an optical projection display member having an optical focusing structure, an optical panel and a light absorbing layer. The optical focusing structure has a plurality of micro optical focusing elements. The light absorbing layer is provided between the optical focusing structure and the optical panel, and includes a plurality of optical transmission windows, each of the plurality of optical transmission windows corresponding to each micro optical focusing element. The optical transmission window is formed by an optical exposure and development method.

  The present invention further provides an optical projection display member having an optical focusing structure and a light absorbing layer. The optical focusing structure includes a plurality of micro optical focusing elements. The light absorption layer has a plurality of optical diffuse reflection windows near a focal point of the optical focusing structure, and each of the plurality of optical diffuse reflection windows corresponds to each micro optical focusing element. The optical diffuse reflection window is formed by an optical exposure and development method.

  Further, in the above-described optical projection display member, an optical diffusion transmission material layer may be formed between the optical focusing structure and the light absorbing layer.

  In the optical projection display member described above, a method of forming an optical transmission window or an optical diffuse reflection window is an exposure and development method. In addition, the position of the optical transmission window or the optical diffuse reflection window changes according to the position of the focused spot after the light beam is applied to the optical focusing structure, and the shape of the optical transmission window or the optical diffuse reflection window is the optical path of the light beam. Corresponding to the shape.

  In addition, the present invention further provides an optical projection device including an optical projection assembly and an optical projection display member, wherein the optical projection assembly is provided to provide an optical image beam, and the optical projection display member is optical. It has a focusing structure, an optical panel, and a light absorbing layer, and is provided for receiving an optical image beam from the optical projection assembly. The optical focusing structure has a plurality of micro optical focusing elements. The light absorbing layer is provided between the optical focusing structure and the optical panel, and includes a plurality of optical transmission windows, each of the plurality of optical transmission windows corresponding to each micro optical focusing element, and further including the plurality of optical transmission windows. The transmission window is formed by an optical exposure and development method.

  The present invention further provides an optical projection device comprising an optical projection assembly and an optical projection display member, wherein the optical projection assembly is provided for providing an optical image beam, and the optical projection display member is provided with an optical focusing device. And a light absorbing layer, and is provided for receiving an optical image beam from the optical projection assembly. The optical focusing structure has a plurality of micro optical focusing elements. The light absorbing layer is near a focal point of the optical focusing structure, and includes a plurality of optical diffuse reflection windows, each of the plurality of optical diffuse reflection windows corresponding to each micro optical focusing element, The optical diffuse reflection window is formed by an optical exposure and development method.

  In the optical projection display member of the present invention, the method of forming the optical transmission window or the optical diffuse reflection window is an exposure and development method. In addition, the position of the optical transmission window or the optical diffuse reflection window changes according to the position of the focused spot after the light beam is applied to the optical focusing structure, and the shape of the optical transmission window or the optical diffuse reflection window is the optical path of the light beam. Corresponding to the shape.

  In addition, the optical projection display member of the present invention may further include an ultra-thin magnifier such as a hologram type or a Fresnel lens type.

  Further, in the method for manufacturing an optical projection display member of the present invention, first, an optical focusing structure is prepared, a plurality of micro optical focusing elements are formed on the optical focusing structure, and then a photosensitive material layer is formed on the optical focusing structure. After forming a plurality of optical window-shaped patterns in the photosensitive material layer by performing exposure and development methods, a part of the photosensitive material layer is removed, and a plurality of optical windows are formed in the photosensitive material layer. Is formed.

  In addition, in the method of manufacturing the optical projection display member of the present invention, the photosensitive material layer is formed by applying a photoresist. In the method of manufacturing an optical projection display member of the present invention, a material layer may be formed on the pattern block, and further, an optical panel may be formed on the material layer and the photosensitive material layer. When the material of the photosensitive material layer contains a light absorbing substance, the material layer is an optically transmissive material layer or an optically diffusely reflective material layer.

  Further, in the method of manufacturing an optical projection display member of the present invention, after forming a material layer on the pattern block, the photosensitive material layer may be removed, and another material layer may be formed on the removed portion. Further, an optical panel may be formed on the material layer.

  In addition, in the method of manufacturing an optical projection display member according to the present invention, the exposing and developing step provides an exposing light source at a predetermined light source use position, and the exposing light source converges on the photosensitive material layer by an optical converging structure. Among them, the photoresist used for the photosensitive material layer is a positive photoresist or a negative photoresist. As a method of removing a part of the photosensitive material layer, the photosensitive material layer which has been already exposed may be removed, or the photosensitive material layer which has not been exposed may be removed.

  As can be seen from the above, according to the optical projection display member of the present invention, the method of forming the optical transmission window or the optical diffuse reflection window is an optical exposure and development method, and the exposure light source is a predetermined light source of the optical projection display member. Since the optical transmission window is located at the position, the shape and the position of the optical transmission window correspond to the optical path after the incident beam is focused on the optical focusing structure, and the wear from which the light from the predetermined light source is unnecessary is minimized, and the display is performed. Efficiency can be greatly improved.

  In addition, since the light absorbing material layer is formed in the predetermined opaque area, stray light from the outside or the optical projection assembly can be effectively absorbed. Further, even when external incident light is incident on the optical projection display member, the incident light can be refracted to the light absorbing material layer by a difference in refractive index, so that the contrast can be greatly improved.

  Since the optical transmission window or the optical diffuse reflection window of the optical projection display member of the present invention can be easily aligned by a simple optical exposure and development principle, the production cost and time can be greatly reduced.

  In addition, since the shape and size of the optical transmission window or the optical diffuse reflection window of the optical projection display member according to the present invention are automatically adjusted according to the change of the incident angle of light, the display size of the optical projection display member increases. Even so, the optical transmission window or the optical diffuse reflection window is still in the optimal transmission or reflection position, and the opening area of the optical transmission window or the optical diffuse reflection window can be kept to a minimum size.

  Furthermore, since the optical projection device of the present invention uses the above-mentioned optical projection display member as a display screen, it is possible to obtain optimal contrast and display efficiency at the same time when the display size is enlarged.

  In the display member according to the present invention, since the method of forming the optical transmission window or the optical diffuse reflection window is an optical exposure method, and the exposure light source is located at a position of a predetermined light source of the display member, the shape and position of the optical transmission window are predetermined. Corresponding to the path of the beam after the beam of the light source is focused on the optical focusing structure, the wear that does not require the light of the predetermined light source can be minimized, and the display efficiency can be greatly improved.

  Further, since the light-absorbing material layer is formed in a predetermined opaque zone, stray light in the outside or the optical projection assembly can be effectively absorbed.Furthermore, even when external incident light is incident on the display member, Since the incident light is refracted by the light absorbing substance layer due to the difference in the refractive index, the contrast can be greatly improved.

  Since the optical transmission window or the optical diffuse reflection window of the display member of the present invention can be easily aligned by a simple optical exposure and development principle, the manufacturing cost and time can be greatly reduced.

  In addition, the shape and size of the optical transmission window or the optical diffuse reflection window of the display member of the present invention are automatically adjusted according to the change of the incident angle. The window or optical diffuse reflection window is in the optimal transmission or reflection position, and the opening area of the optical transmission window or optical diffuse reflection window can be kept to a minimum size.

  Furthermore, the optical projection device according to the present invention uses the display member as a display screen, so that when the display size is enlarged, optimal contrast and display efficiency can be obtained at the same time.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and there are design changes and the like within a range not departing from the gist of the present invention. Are also included in the present invention. Accordingly, the invention is limited by the appended claims.

  In order to further clarify the above objects and features of the present invention, embodiments will be described in detail below with reference to the drawings.

  FIG. 4 is a partial schematic view of a display member according to the present invention. As shown in FIG. 4, the display member 200 includes an optical focusing structure 206, an optical panel 202, and a light absorbing material layer 204 having an optical transmission window 208 formed by an optical exposure and development method.

  Optical panel 202 scatters incident light from one surface from the other surface. The principle of operation is that the difference in the refractive index between the optical panel 202 and the outside air creates a relatively large scattering angle when light exits the surface of the optical panel 202, so that it can achieve the purpose of a wide viewing angle. it can.

  The optical focusing structure 206 includes a plurality of micro optical focusing elements 210. Each micro optical focusing element 210 focuses incident light from one side to the other side and focuses the incident light source to one focal point.

  The light absorbing material layer 204 is located between the optical panel 202 and the optical focusing structure 206 and can absorb unnecessary stray light. In addition, a plurality of optical transmission windows 208 are provided in the light absorbing material layer 204, and the positions of the optical transmission windows 208 correspond to the focal points of the micro optical focusing element 210. The material of the optical transmission window 208 is, for example, air, an optical diffusion transmission material, or an optical transmission material. In addition, the method of forming the optical transmission window 208 is an optical exposure and development method such as an exposure and development method.

  Next, a method for manufacturing the display member 300 according to the present invention will be described in the first embodiment. As shown in FIG. 5A, first, an optical focusing structure 302 having a plurality of micro optical focusing elements 314 is prepared. Next, a photosensitive material layer 304a doped with a light absorbing substance is formed on the optical focusing structure 302. The material of the photosensitive material layer 304a is, for example, a positive photosensitive material, a negative photosensitive material, or a photoresist containing any of the above photosensitive materials.

  Then, an exposure light source (not shown) such as, for example, a UV light source is installed at a predetermined position of the used light source (approximately the position of the optical projection assembly 310 in FIG. 6). The light emission type of the exposure light source is the same as that of the optical projection assembly 310.

  Subsequently, the exposure light source is driven to emit light. This light beam enters the optical focusing structure 302 at an incident angle θ (as indicated by the arrow in the figure), and forms a focused spot on the photosensitive material layer 304a by the focusing action of the micro-optical focusing element 314. A portion of the photosensitive material layer 304a is exposed. The shape of this portion corresponds to the optical path of the exposure light source.

  Thereafter, as shown in FIG. 5B, the exposed photosensitive material layer 304a is removed to form a photosensitive material layer having a plurality of openings 306a and serving as a light absorbing material layer 304b.

  Next, as shown in FIG. 5C, an optically transmissive material layer is formed in the opening 306a to form an optically transmissive window 306b. Alternatively, the optical transmission window 306b may be directly made of air. After that, the optical panel 308 is formed on the optical transmission window 306b and the light absorbing material layer 304b. Thus, the production of the display member 300 is completed.

  As shown in FIG. 6, when the display member 300 of the present invention and the optical projection assembly 310 are combined, an optical projection device 312 according to the present invention is obtained. The optical projection assembly 310 provides the image beam required by the optical projection device 312. The optical projection assembly 310 includes, for example, a light valve and a projection lens that generate an image, and the image generated by the light valve enters the display member 300 at an angle of the cone through the projection lens. Alternatively, the optical projection assembly 310 may be configured with only a light valve that produces an image beam. In addition, the display member 300 can receive a light ray within the range of the angle of the cone-shaped body, and displays optical information included in the light ray.

  In the process of forming the optical transmission window 306b according to the present invention, the patterning effect is achieved by the light rays generated by the exposure light source in the optical projection assembly 310, and the light emitting type of the exposure light source and the optical projection assembly 310 are used. Since the light source is similar and the irradiation angle is similar to the irradiation angle of the optical projection assembly 310, the optical path of the light beam emitted by the exposure light source is similar to the optical projection assembly 310, and therefore the optical transmission window 304b is also the optical projection assembly. It corresponds to the shape of the light path of the light source of the solid 310.

  One preferred embodiment of the present invention, for example, takes the exposure light source so that its area is approximately equal to the effective area of the light valve and makes the position of this exposure light source approximately equal to the location of the light valve. . By using the projection lens, the magnification of the exposure light source is made substantially equal to the magnification when the light valve is originally used. In this manner, since the exposure beam applied to each position of the display member 300 becomes substantially equal to the image beam when the light valve is used, the position and size of the optical transmission window 304b formed by the exposure light source are Is equal to the position and size required for the image beam when using.

  Further, the position of the optical transmission window 304b is automatically adjusted according to the difference in the angle of the incident light beam. For this reason, the minimum window opening area can be maintained even in the situation where the focused light has the maximum transmission effect.

  As can be seen from the above, since the position and shape of the optical transmission window on this display member are both optimal, the optical projection device using this display member also has the optimal contrast and display efficiency.

  7A to 7E show a manufacturing flowchart of the display member according to the second embodiment of the present invention.

  First, as shown in FIG. 7A, an optical focusing structure 402 including a plurality of micro optical focusing elements 412 is prepared. Next, a photosensitive material layer 404a such as a positive photosensitive material layer or a negative photosensitive material layer is formed on the optical focusing structure 402.

  Thereafter, an exposure light source (not shown) such as, for example, a UV light source is installed at a predetermined position of the used light source (approximately the position of the optical projection assembly 310 shown in FIG. 6). The emission type of the exposure light source is the same as the type of the optical projection assembly 310, for example, a point light source.

  Next, the exposure light source is driven to generate a light beam, and the light beam (as indicated by the arrow in the figure) is made incident on the optical focusing structure 402 at an incident angle θ, and the focusing action of the micro-optical focusing element 412 causes the photosensitive material to emit light. A focused spot is formed on the layer 404a, and the photosensitive material layer 404a in this portion is exposed. The shape of this portion corresponds to the optical path of the exposure light source.

  Thereafter, as shown in FIG. 7B, the unexposed photosensitive material layer 404a is removed to form a photosensitive material layer 404b in a region 404c where the optical focusing structure 402 is exposed. Subsequently, as shown in FIG. 7C, a light-absorbing material layer 406 is formed over the region 404c.

  Next, as shown in FIG. 7D, the remaining photosensitive material layer 404b is removed to form an opening 408a. Subsequently, as shown in FIG. 7E, an optically transparent material layer is formed in the opening 408a to form an optically transparent window 408b. The material of the optical transmission window 408b is, for example, an optical diffusion transmission material or an optical transmission material. In addition, the optical transmission window 408b may be directly made of air. After that, the optical panel 410 is formed on the optical transmission window 408b and the light absorbing material layer 406. Thus, the production of the display member 400 is completed.

  Further, when the stray light is incident on the display members 300 and 400 of the present invention, the incident angle and the predetermined incident angle are different, so that the light absorbing material layers 304b and 406 absorb the stray light, and the display members 300 and 400 display an image. In this case, a more favorable contrast is obtained without receiving interference of stray light.

  In addition, although the present invention has been described with reference to a display member having an optical transmission window as an example, the present invention is not limited to this, and may be changed to a display member having an optical diffuse reflection window. As shown in FIG. 8A, after completing the opening 306a or the opening 408a in the above step, the display member 500 of the present invention forms the optical diffusion / reflection material layer 506 in the openings 306a and 408a. The display member 500 can be obtained.

  In this embodiment, the path through which the light rays travel is incident on the micro-optical focusing element 508 of the optical focusing structure 502 from the optical paths 1, 2, and 3, and is focused on the optical diffuse reflection material layer 506 through the micro-optical focusing element 508. . Thereafter, the optically diffusive reflective material layer 506 reflects the light paths 1, 2, 3 and refracts further through the optical focusing structure 502 (ie, light paths 4, 5, 6, 7, 8, 9).

  In addition, as shown in FIG. 8B, when the optical paths 1, 2, and 3 are incident on the optical focusing structure 502 at an incident angle θ, the position of the optical diffuse reflection material layer 506 is automatically adjusted to the incident angle θ during manufacturing. Since the light paths 1, 2, and 3 that are incident at the incident angle θ are not absorbed by the light-absorbing material layer 504, the display efficiency can be maintained more favorably.

  Further, as shown in FIG. 9, the display member 300 of the present invention may include an ultra-thin magnifying mirror 316 which is an optical member for improving the brightness and uniformity of the projected light beam. The type of the ultra-thin magnifying glass 316 is, for example, a hologram or a Fresnel lens type.

  Further, when external stray light is incident on the display member 500 of the present invention, the incident angle is different from the predetermined incident angle, so that the light is absorbed by the light absorbing material layer 504, and when the display member 500 displays an image, It has a more favorable contrast without being affected by stray light.

  In addition, in the display member according to the present invention, an optical diffusion material layer may be formed between the optical focusing structure and the optical transmission window. The formation method is, for example, to apply an optical diffusion transmission material layer on the optical focusing structure, and then apply a photoresist. Thereafter, when an optical transmission window is formed by the above-described optical exposure and development method, a structure according to another embodiment of the display member of the present invention is completed. In addition, in this embodiment, an optical panel can be formed to obtain a structure of a display member according to still another embodiment.

1 is a schematic diagram showing a part of a conventional display screen. 2 is a schematic diagram showing a light source incident on the display screen of FIG. 1 at an angle θ. 1 is a schematic view showing a conventional optical projection device. It is the schematic which shows some display members of this invention. 3 is a manufacturing flowchart of a display member according to the first embodiment of the present invention. 3 is a manufacturing flowchart of a display member according to the first embodiment of the present invention. 3 is a manufacturing flowchart of a display member according to the first embodiment of the present invention. 1 is a schematic diagram illustrating an optical projection device according to an embodiment of the present invention. 6 is a flowchart for manufacturing a display member according to a second embodiment of the present invention. 6 is a flowchart for manufacturing a display member according to a second embodiment of the present invention. 6 is a flowchart for manufacturing a display member according to a second embodiment of the present invention. 6 is a flowchart for manufacturing a display member according to a second embodiment of the present invention. 6 is a flowchart for manufacturing a display member according to a second embodiment of the present invention. 13 is a schematic view showing a part of a display member according to a third embodiment of the present invention. 8B is a schematic diagram illustrating a light source incident on the display member of FIG. 8A at an angle θ. 5 is a schematic view of another embodiment of the optical projection device according to the first embodiment of the present invention.

Explanation of reference numerals

1, 2, 3, 4, 5, 6, 7, 8, 9 light path
100 screen
102, 202, 308, 410 optical panel
104 optical sphere
106, 204, 304b, 406, 504 Light absorbing material layer
108, 310 Optical projection assembly
110, 312 Optical projection device
200, 300, 400, 500 Display members
206, 302, 402, 502 Optical focusing structure
208, 306b, 408b Optical transmission window
210, 314, 412, 508 micro optical focusing element
304a, 404a, 404b photosensitive material layer
306b, 408b opening
316 ultra-thin magnifier
404c area
506 Optical diffuse reflection material layer θ Incident angle

Claims (8)

An optical focusing structure having a plurality of micro optical focusing elements,
A light absorbing layer near the focal point of the optical focusing structure, each light emitting layer corresponding to each of the plurality of micro optical focusing elements, and having a plurality of optical windows formed by an optical exposure method, Comprising,
An optical projection display member characterized by the above-mentioned. The position of the plurality of optical windows changes with the position of the spot focused after the incident beam irradiates the optical focusing structure, and the shape of the plurality of optical windows is such that the incident beam is focused on the optical focusing structure. Corresponding to the shape of the optical path after
2. The optical projection display member according to claim 1, wherein a material of the optical window is one selected from the group consisting of air, an optical diffusion transmission material, an optical transmission material, and an optical diffusion reflection material. An optical projection assembly for providing an optical image beam;
An optical projection display member for receiving an optical image beam from the optical projection assembly,
The optical projection display member,
An optical focusing structure having a plurality of micro optical focusing elements,
A light absorbing layer near the focal point of the optical focusing structure, each light emitting layer corresponding to each of the plurality of micro optical focusing elements, and having a plurality of optical windows formed by an optical exposure method, An optical projection device comprising: The position of the plurality of optical windows changes with the position of the spot focused after the incident beam irradiates the optical focusing structure, and the shape of the plurality of optical windows is such that the incident beam is focused on the optical focusing structure. Corresponding to the shape of the optical path after
4. The optical projection device according to claim 3, wherein the material of the optical window is one selected from the group consisting of air, an optical diffusion transmission material, an optical transmission material, and an optical diffusion reflection material. Providing an optical focusing structure having a plurality of micro optical focusing elements formed thereon;
Forming a photosensitive material layer near the focal point of the optical focusing structure;
Performing an optical exposure and development method to form a plurality of first patterns on the photosensitive material layer,
Removing a portion of the photosensitive material layer to form a plurality of first pattern blocks in the photosensitive material layer;
Forming a first material layer on the plurality of first pattern blocks. A method for manufacturing an optical projection display member, comprising:   The material of the photosensitive material layer includes a light absorbing substance, and the material of the first material layer is one selected from the group consisting of air, an optically diffuse transmission material, an optically transparent material, and an optically diffusely reflective material. 6. The method for producing an optical projection display member according to claim 5, wherein The step of the optical exposure development method,
After generating an exposure beam by an exposure light source, project the exposure beam onto the photosensitive material layer, and the angle of the exposure beam is substantially equal to the angle of the beam of the source of the actual optical projection display image, or
A beam is generated by an exposure light source, the beam generates an exposure beam through an exposure projection lens, and then the exposure beam is projected onto the photosensitive material layer, and the angle of the exposure beam is the source of the actual optical projection display image. Approximately equal to the angle of the beam of
6. The method for manufacturing an optical projection display member according to claim 5, wherein: Removing the photosensitive material layer to form a plurality of second pattern blocks;
Forming a second material layer on the plurality of second pattern blocks;
Further comprising
The material of the second material layer is one selected from the group consisting of a light absorbing substance, air, an optical diffusion transmission material, an optical transmission material, and an optical diffusion reflection material, and the material of the second material layer is a light absorption material. When containing a substance, the material of the first material layer is one selected from the group consisting of air, an optical diffusion transmission material, an optical transmission material, and an optical diffusion reflection material,
When the material of the second material layer is one selected from the group consisting of air, an optical diffusion transmission material, an optical transmission material, and an optical diffusion reflection material, the material of the first material layer includes a light absorbing material. ,
6. The method for producing an optical projection display member according to claim 5, wherein: