EP0366462A2 — Projection type image display apparatus

Claim 1

Independent Claim 128 words

A projection type image display apparatus in which light from a light source (5) is projected onto a no-emissive display portion, and an image of said display portion is then projected onto a predetermined projection surface (6), said display portion comprising a display panel (1) on which a plurality of pixels are arranged in matrix away from each other by a predetermined first spacing, a first microlens array (2a) provided at the side of said display panel (1) facing to said light source, and including a plurality of microlenses arranged away from each other by a predetermined second spacing in positions corresponding to the plurality of pixels on said display panel (1), and said first spacing and said second spacing are selected to be different from each other.

Claim 2

Dependent Claim 128 words

A projection type image display apparatus in which light from a light source (5) is projected onto a no-emissive display portion, and an image of said display portion is then projected onto a predetermined projection surface (6), said display portion comprising a display panel (1) on which a plurality of pixels are arranged in matrix away from each other by a predetermined first spacing, a first microlens array (2a) provided at the side of said display panel (1) facing to said light source, and including a plurality of microlenses arranged away from each other by a predetermined second spacing in positions corresponding to the plurality of pixels on said display panel (1), and said first spacing and said second spacing are selected to be different from each other.

Claim 3

Dependent Claim 52 words

A projection type image display apparatus according to claim 1, further comprising a second microlens array (2b) provided at the side of said display panel (1) facing to said projection surface (6), and including a plurality of microlenses arranged in positions corresponding to the plurality of pixels on said display panel (1).

Claim 4

Dependent Claim 55 words

A projection type image display apparatus according to claim 1 or 2, further comprising a condenser lens (4) provided between said light source (5) and said display portion (1) for focusing the light from said light source (5) on said projection surface side, said first spacing being selected to be larger than said second spacing.

Claim 5

Dependent Claim 45 words

A projection type image display apparatus according to claim 2, wherein said plurality of microlenses of said second microlens array (2b) are spaced apart from each other by a predetermined third spacing, and said third spacing is selected to be smaller than said first spacing.

Claim 6

Dependent Claim 145 words

A projection type image display apparatus according to claim 4, wherein said plurality of pixels are arranged on a first plane surface on said display panel (1); said plurality of microlenses on said first microlens array (2a) are provided on a second plane surface; said plurality of microlenses of said second microlens array (2b) are provided on a third plane surface; where a distance between said first plane surface and said second or third plane surface is t, a refractive index of a substrate of said display panel (1) is n, a distance between said display panel (1) and said projection lens (4) is L, and said first spacing is P₀, pitches P₁ and P₂ of said first and second microlens arrays (2a, 2b) are selected to satisfy the following expressions: P₁ = P₀ {1 + t/ (n·L)} P₂ = P₀ {1 - t/ (n·L)}

Claim 7

Dependent Claim 92 words

A projection type image display apparatus according to claim 5, wherein said plurality of pixels are formed in a first direction and in a second direction intersecting with said first direction; said plurality of microlenses of said first and second microlens arrays (2a, 2b) are provided in said first direction and in said second direction; said plurality of microlenses formed in said second direction are integrated; and said first and second microlens arrays (2a, 2b) include cylindrical lenses spaced away from each other by said predetermined second spacing in said first direction.

Claim 8

Dependent Claim 17 words

A projection type image display apparatus according to claim 5, wherein said cylindrical lenses include semicylindrical lenses.

Claim 9

Dependent Claim 57 words

A projection type image display apparatus including a non-emissive display control member which has a matrix array of controllable pixel elements, and a microlens array adjacent the display control member with a lens spacing arranged in relation to the pixel element spacing for optimum transmission of light from a convergent incident beam through each pixel element/lens pair.

Claim 10

Dependent Claim 57 words

A projection type image display apparatus including a non-emissive display control member which has a matrix array of controllable pixel elements, and a microlens array adjacent the display control member with a lens spacing arranged in relation to the pixel element spacing for optimum transmission of light from a convergent incident beam through each pixel element/lens pair.

Claim 11

Independent Claim 131 words

A device for use in an image projection apparatus for modulating a light beam in accordance with an image to be projected; said device comprising a light control panel having a two-dimensional array of pixel elements whose light transmissivities are controllable by image signals applied thereto, and a lens plate disposed adjacent said light control panel and comprising a two-dimension array of micro lenses arranged in a pattern corresponding to the pattern of pixel elements on the light control panel, but with an inter-lens spacing which differs from the spacing of the pixel element array so that each said pixel and its corresponding microlens are aligned along a respective axis which converges toward the main optical axis of the device, for transmitting a respective part of an incident convergent light beam.

Claim 12

Independent Claim 131 words

A device for use in an image projection apparatus for modulating a light beam in accordance with an image to be projected; said device comprising a light control panel having a two-dimensional array of pixel elements whose light transmissivities are controllable by image signals applied thereto, and a lens plate disposed adjacent said light control panel and comprising a two-dimension array of micro lenses arranged in a pattern corresponding to the pattern of pixel elements on the light control panel, but with an inter-lens spacing which differs from the spacing of the pixel element array so that each said pixel and its corresponding microlens are aligned along a respective axis which converges toward the main optical axis of the device, for transmitting a respective part of an incident convergent light beam.

Projection type image display apparatus

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag