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Polarizing light beamsplitter, manufacturing method, and liquid crystal projector using the same

A polarizing beam splitter, polarized light technology, applied in polarizing elements, optics, instruments, etc., can solve the problems of phase difference value deviation, phase difference film discoloration, image quality deterioration, etc., to improve brightness and prevent image quality. The effect of deterioration and improvement of heat resistance

Inactive Publication Date: 2009-08-19
BINIT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the polarizing beam splitter disclosed in the above-mentioned Patent Document 1 can guide the heat of the high-temperature part to the low-temperature part to make the temperature distribution of the flat beam splitter body uniform, but the retardation film is discolored due to the high temperature. (yellowing), burning, deviation of phase difference value, etc., so it cannot solve the problem of deterioration of projected image quality, etc.
[0011] In addition, in recent years, liquid crystal projectors with high brightness, high image quality, and large screen are required. Therefore, the increase in heat protection from optical components such as polarizing beam splitters, discoloration (yellowing), burning, and The deviation of the phase difference value, etc., the problem of deterioration of the projected image quality becomes more serious

Method used

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  • Polarizing light beamsplitter, manufacturing method, and liquid crystal projector using the same
  • Polarizing light beamsplitter, manufacturing method, and liquid crystal projector using the same
  • Polarizing light beamsplitter, manufacturing method, and liquid crystal projector using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] figure 1 It is a figure which shows the structure of the polarizing beam splitter 101 which is 1st Embodiment. in the figure 1 , a cross-sectional view of the polarizing beam splitter 101 is shown. figure 1 The enlarged part in represents a part of the cross section of the retardation film 60 . figure 2 It is a figure which shows the structure of the retardation film 60 of this invention.

[0069] Such as figure 1 As shown, the polarizing beam splitter 101 is composed of a first prism member 10 , a second prism member 20 , a polarization separation film (PBS film) 30 , a cold mirror 40 , a light shielding plate 50 , and a retardation film 60 .

[0070] In addition, the configuration of the polarizing beam splitter 101 is not limited to the configuration using the visor 50 . Other light shielding members may also be used.

[0071] The cross sections of the first prism member 10 and the second prism member 20 are formed in a parallelogram. In the case of a pol...

Embodiment 2

[0104] Figure 7 It is a figure which shows the structure of the polarizing beam splitter 102 which is 2nd Embodiment. in the Figure 7 A cross-sectional view of the polarizing beam splitter 102 is shown in .

[0105] Such as Figure 7 As shown, the polarizing beam splitter 102 is composed of a first prism member 10 , a second prism member 20 , a polarization separation film 30 , a cold mirror 40 , a light shielding plate 50 , a retardation film 60A, and an oxygen blocking layer 70 . In the case of this example, the oxygen barrier layer 70 is arranged on the upper part of the retardation film 60A through the adhesive 80 .

[0106] The retardation film 60A has two layers of polymer materials having liquid crystallinity. For example, the first alignment film 62 formed on the glass substrate 61 , the first liquid crystal polymer material layer 63 stacked on the first alignment film 62 , the second liquid crystal polymer material layer stacked on the first liquid crystal polym...

Embodiment 3

[0113] Figure 10 It is a sectional view showing the configuration of the polarizing beam splitter 103 as the third embodiment. Figure 10 The enlarged view of the X portion in the figure shows a part of the cross section of the retardation film 60B.

[0114] Such as Figure 10 As shown, the polarizing beam splitter 103 is composed of a first prism member 10, a second prism member 20, a polarization separation film 30, a cold mirror 40, a light shielding plate 50, and a retardation film 6OB. In the case of this embodiment, the retardation film 60B is arranged on the first prism member side of the polarization separation film 30 (the upper surface of the polarization separation film 30 ). This retardation film 60B functions as a positive A plate.

[0115] The retardation film 60B is formed by the same formation method as that of the retardation film 60 of the first embodiment described above, or is formed directly on the upper surface of the polarization separation film 30 w...

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Abstract

The invention provides a polarising beam splitter using a phase difference thin film composed of liquid crystal high polymer materials, manufacturing method thereof and a liquid crystal projector using the polarising beam splitter. The polarising beam splitter (101) is composed of a first prism element (10), a second prism element (20), a polarized light separation film (PBS film), a cold mirror (40), an occluder (50) and a phase difference thin film (60). The phase difference thin film (60) is composed of a glass substrate (61), a first alignment film (62) formed on the glass substrate (61), a first liquid crystal high polymer material layer (63) superposed on the first alignment film (62), a second alignment film (64) superposed on the first liquid crystal high polymer material layer (63) and a second liquid crystal high polymer material layer (65) superposed on the second alignment film (64).

Description

technical field [0001] The present invention relates to a polarizing beam splitter (PBS) for splitting an incident light beam from a light source into P-polarized light and S-polarized light and its manufacturing method, and also relates to a liquid crystal projector using the polarized beam splitter. Background technique [0002] A liquid crystal projector has a light source and an optical system composed of a plurality of optical components including a polarizing beam splitter, a liquid crystal panel, and a projection lens. Light from the light source is introduced into the optical system and projected as image light from the projection lens (see of Figure 14 ). [0003] Such as Figure 17 As shown, conventionally, a polarizing beam splitter W used in equipment such as a liquid crystal projector combines a plurality of first prism members 1 and second prism members 2 having a parallelogram in cross-section to form a planar beam splitter body. . The bonding surface of t...

Claims

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Application Information

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IPC IPC(8): G02B27/28G02B5/30G03B21/14
Inventor 森寿彦石原亮深泽一男前山裕行本间孝之
Owner BINIT
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