Rear projection screen and method of producing the same
First Claim
1. A rear projection screen comprising one or more sheet members, wherein a base constituting the last sheet member, through which light transmitted sequentially through the sheet members from the side of a plane of incidence is transmitted last, comprises a transparent material, and a light diffusing layer is provided at a plane of emergence of the last sheet member, the light diffusing layer including a light diffuser and a transparent binder, the transparent binder having a refractive index different from a refractive index of the light diffuser and being at least one of an ultraviolet curable material and a colored material.
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Accused Products
Abstract
A rear projection screen for use in a rear projection image display device comprises one or more sheet members through which light is sequentially transmitted from the side of a plane of incidence of the screen, the last sheet member comprising a transparent material as a base thereof, and a light diffusing layer provided on the side of a plane of emergence of the base. A light diffuser having a refractive index different from that of the base may be dispersed in the base so as to contrive a greater viewing angle. Further, a transperent binder for supporting the light diffuser dispersed in the light diffusing layer or the light diffuser itself may be colored in order to obtain a further enhanced contrast.
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Citations
24 Claims
- 1. A rear projection screen comprising one or more sheet members, wherein a base constituting the last sheet member, through which light transmitted sequentially through the sheet members from the side of a plane of incidence is transmitted last, comprises a transparent material, and a light diffusing layer is provided at a plane of emergence of the last sheet member, the light diffusing layer including a light diffuser and a transparent binder, the transparent binder having a refractive index different from a refractive index of the light diffuser and being at least one of an ultraviolet curable material and a colored material.
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18. A method of producing a rear projection screen comprising one or more sheet members through which light is sequentially transmitted from the side of a plane of incidence of the screen, a lenticular lens array, a light diffusing layer comprising a light diffuser dispersed and supported in a transparent binder. Both the lenticular lens array and the light diffusing layer being provided on the side of a plane of emergence of the last sheet member through which the light is transmitted last, and a light absorbing layer provided between a base constituting the last sheet member and the light diffusing layer, in light non-transmitting areas of the lenticular lens array at the plane of emergence, the method comprising the steps of:
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preparing an ultraviolet-curing resin as a material for the transparent binder of the light diffusing layer; coating a base of the last sheet member with a coating material for forming the light absorbing layer, in light non-transmitting areas of the lenticular lens array, and drying the coating material; coating the entire surface of the lenticular lens array, inclusive of the light non-transmitting areas, with a coating material for forming the light diffusing layer; and curing the coating material for forming the light diffusing layer by irradiation with ultraviolet rays.
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19. A method of producing a rear projection screen comprising one or more sheet members through which light is sequentially transmitted from the side of a plane of incidence of the screen, a lenticular lens array, a light diffusing layer comprising a light diffuser dispersed and supported in a transparent binder, both the lenticular lens array and the light diffusing layer being provided on the side of a plane of emergence of the last sheet member through which the light is transmitted last, and a light absorbing layer provided on the light diffusing layer, in light non-transmitting areas of the lenticular lens array at the plane of emergence, the method comprising the steps of:
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preparing an ultraviolet-curing resin as a material for the transparent binder of the light diffusing layer; coating the base of the last sheet member with a coating material for forming the light diffusing layer, in the entire area of the lenticular lens array inclusive of the light non-transmitting areas; curing the coating material by irradiation with ultraviolet rays; and coating the light non-transmitting areas of the lenticular lens array with a coating material for forming the light absorbing layer, and drying the coating material
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20. A method of producing a rear projection screen comprising one or more sheet members through which light is sequentially transmitted from the side of a plane of incidence of the screen, a lenticular lens array, a light diffusing layer comprising a light diffuser dispersed and supported in a transparent binder, both the lenticular lens array and the light diffusing layer being provided on the side of a plane of emergence of the last sheet member through which the light is transmitted last, and a light absorbing layer provided between a base constituting the last sheet member and the light diffusing layer, in light non-transmitting areas of the lenticular lens array at the plane of emergence, the method comprising the method comprising the steps of;
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preparing an ultraviolet-curing resin as a material for the transparent binder of the light diffusing layer and an utraviolet-curable resin as a material for the light absorbing layer; coating a base of the last sheet member with a coating material for forming the light absorbing layer, in light non-transmitting areas of the lenticular lens array; incompletely curing the coating material by irradiation with ultraviolet rays; coating the entire surface of the lenticular lens array inclusive of the light non-transmitting portions with a coating material for forming the light diffusing layer; and curing simultaneously the coating materials for the light absorbing layer and the light diffusing layer by irradiation with ultraviolet rays.
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21. A method of producing a rear projection screen comprising one or more sheet members through which light is sequentially transmitted from the side of a plane of incidence of the screen, a lenticular lens array, a light diffusing layer comprising a light diffuser dispersed and supported in a transparent binder, both the lenticular lens array and the light diffusing layer being provided on the side of a plane of emergence of the last sheet member through which the light is transmitted last, and a light absorbing layer provided on the light diffusing layer, in light non-transmitting areas of the lenticular lens array at the plane of emergence, the method comprising the steps of:
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preparing an ultraviolet-curing resin as a material for the transparent binder of the light diffusing layer and ultraviolet-curable resin as a material for the light absorbing layer; coating the base of the last sheet member with a coating material for forming the light diffusing layer, in the entire area of the lenticular lens array inclusive of the light non-transmitting area; incompletely curing the coating material for the light diffusing layer by irradiation with ultraviolet rays; coating the light non-transmitting areas of the lenticular lens array with a coating material for forming the light absorbing layer; and curing simultaneously the coating materials for the light diffusing layer and the light absorbing layer by irradiation with ultraviolet rays.
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22. A method of producing a rear projection screen comprising one or more sheet members through which light is sequentially transmitted from the side of a plane of incidence of the screen, a lenticular lens array, and a light diffusing layer comprising a light diffuser dispersed and supported in a transparent binder, both the lenticular lens array and the light diffusing layer being provided on the side of a plane of emergence of the last sheet member through which the light is transmitted last, the method comprising the steps of:
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applying an adhesive to the base of the last sheet member; scattering a second light diffuser having a particle diameter of 30 to 300 μ
m on the adhesive;pressing the second light diffuser to fix the second light diffuser on the base; scattering a first light diffuser having a particle diameter of 0.4 to 10 μ
m;pressing the first light diffuser to fix the first light diffuser on the base; and curing the adhesive.
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24. A rear projection screen comprising three sheet members, wherein a base constituting the last sheet member, through which light transmitted sequentially through the three sheet members from the side of a plane of incidence is transmitted last, comprises a transparent material, and a light diffusing layer is provided at a plane of emergence of the last sheet member, and wherein the three sheet members comprise a first sheet member, a third sheet member and a second sheet member which are arranged in parallel and in that order from the incidence side toward the emergence side of the screen, the first sheet member comprises a Fresnel lens, the third sheet member comprises a lenticular lens array, the second sheet member has a plane of incidence and a plane of emergence each having a geometry of a lenticular lens array, the array directions of the lenticular lens arrays of the second sheet member being substantially orthogonal to the array direction of the lenticular lens array of the third sheet member, a slight diffusing layer is provided at the plane of emergence of the second sheet member, and the third sheet member comprising the lenticular lens array is disposed between the first sheet member and the second sheet member.
Specification