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Wire grid polarization element and projection type display apparatus

一种线栅偏振、显示装置的技术，应用在偏振元件、利用投影装置图像重现器、放映装置等方向，能够解决水分或氧气侵入、易发生腐蚀或氧化等问题

Active Publication Date: 2018-09-25
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal wire grids made of aluminum or aluminum alloys have problems in that they react with moisture or oxygen in the air to easily corrode or oxidize.
[0004] However, in the structure in which the light-transmitting substrate and the cover glass face each other through the spacer like the structure described in Patent Document 1, since the space between the light-transmitting substrate and the cover glass on the outer peripheral side is wide, Therefore, even if it is sealed with a sealant (adhesive), moisture or oxygen may penetrate through the sealant

Method used

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  • Wire grid polarization element and projection type display apparatus
  • Wire grid polarization element and projection type display apparatus
  • Wire grid polarization element and projection type display apparatus

Examples

Experimental program
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Embodiment approach 1

[0027] (Structure of wire grid polarizing element 1)

[0028] figure 1 It is an explanatory diagram showing the appearance of the wire grid polarizing element 1 of the first embodiment of the present invention. figure 2 Yes figure 1 A cross-sectional view of the wire grid polarizing element 1 shown. figure 1 with figure 2 The wire grid polarizing element 1 shown has a translucent first substrate 2 and a metal wire grid 4 formed on one surface 2 a of the first substrate 2. The wire grid 4 is composed of a plurality of thin metal wires 41 arranged in parallel, and the thickness and the space (interval between the thin metal wires 41) of the thin metal wires 41 are, for example, 400 nm or less. In this embodiment, the thickness and space of the thin metal wires 41 are, for example, 100 nm to 200 nm, respectively. In the wire grid 4 constructed in this way, as long as the pitch of the thin metal wires 41 is sufficiently shorter than the wavelength of the incident light, the first c...

Embodiment approach 2

[0043] Figure 4 It is a cross-sectional view of the wire grid polarizing element 1 of the second embodiment of the present invention. In addition, since the basic structure of the present embodiment is the same as that of the first embodiment, the same reference numerals are given to the common parts, and their description is omitted.

[0044] In the first embodiment, the recess 21 is formed on the first substrate 2, but in this embodiment, the recess 31 is formed on the second substrate 3. More specifically, Figure 4 The wire grid polarizing element 1 shown has a light-transmitting first substrate 2 and a metal wire grid 4 formed on one surface 2a of the first substrate 2 as in the first embodiment. The wire grid 4 (the thin metal wire 41) is composed of an alloy containing aluminum as a main component, silver, or an alloy containing silver as a main component. In addition, a translucent second substrate 3 facing one surface 2a of the first substrate 2 is provided, and the sp...

Embodiment approach 3

[0048] Figure 5 It is an explanatory diagram showing an enlarged view of the wire grid 4 of the wire grid polarizing element 1 of the third embodiment of the present invention. In addition, since the basic structure of the present embodiment is the same as that of the first embodiment, the same reference numerals are given to the common parts, and their description is omitted. In the first and second embodiments, the wire grid 4 is formed by only the thin metal wires 41, but it may be like Figure 5 As shown, the present invention is applied to a case where the light absorbing layer 51 of silicon, germanium, or the like is formed at the end of the wire grid 4 on the opposite side of the first substrate 2 (the end of the thin metal wire 41). According to this structure, it is possible to suppress reflection of light incident on the wire grid 4 from the side of the second substrate 3.

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PUM

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Abstract

The invention provides a wire grid polarization element that can reliably seal a space in which the wire grid is formed, and a projection type display apparatus. In a wire grid polarization element (1), a second light transmissing substrate (3) is disposed on one surface (2a) of the first light transmissing substrate (2) on which a metallic wire grid (4) is formed, and on the one surface (2a) of the first substrate (2), a recessed portion (21) is formed in a region overlapping a region where the wire grid (4) is formed in plan view. For this reason, it is possible to secure a space (10) in which the wire grid (4) is disposed between the first substrate (2) and the second substrate (3) without using a spacer. In addition, at the time of sealing the space (10) in which the wire grid (4) is disposed, the first substrate (2) and the second substrate (3) are bonded to each other on the outer side of the recessed portion (21).

Description

Technical field [0001] The present invention relates to a wire grid polarizing element having a metal wire grid and a projection display device. Background technique [0002] The projection display device has a liquid crystal panel, a light source unit that emits light supplied to the liquid crystal panel, and a projection optical system that projects light modulated by the light valve. Polarization is arranged on the optical path from the light source unit to the projection optical system via the liquid crystal panel. element. These polarizing elements often use polarizing elements made of organic materials, but polarizing elements made of organic materials have low heat resistance. Therefore, a structure using a wire grid polarizing element (inorganic polarizing element) in which a metal wire grid made of aluminum or aluminum alloy is formed on a translucent substrate has been proposed. However, metal wire grids made of aluminum or aluminum alloys have a problem in that they ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30H04N9/31
CPCG02B5/3058H04N9/3141H04N9/3105H04N9/3167G02B27/141G03B21/2073G02F1/133528G02F1/1339H04N5/74G02F1/133548
Inventor 大堀光隆赤坂康一郎熊井启友
Owner SEIKO EPSON CORP