JPS643686A - Large screen display - Google Patents

Large screen display

Info

Publication number
JPS643686A
JPS643686A JP16007787A JP16007787A JPS643686A JP S643686 A JPS643686 A JP S643686A JP 16007787 A JP16007787 A JP 16007787A JP 16007787 A JP16007787 A JP 16007787A JP S643686 A JPS643686 A JP S643686A
Authority
JP
Japan
Prior art keywords
light
blue
lens
screen
green
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16007787A
Other languages
Japanese (ja)
Inventor
Yoshio Hayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP16007787A priority Critical patent/JPS643686A/en
Publication of JPS643686A publication Critical patent/JPS643686A/en
Pending legal-status Critical Current

Links

Landscapes

  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PURPOSE: To control a background color to gray close to black and to improve color contrast by synthesizing a part of blue light reflected by a dichroic mirror and pixel light on a screen. CONSTITUTION: Light from a light source 1 with a reflector is converted into parallel light by a condenser lens 2 and the parallel light is made incident upon a blue clichroic mirror 3 to pass red and green spectrum light components and reflect blue spectrum light. The transmitted red and green light components is made incident upon a liquid crystal light bulb 7 through a polarized beam splitter prism 4 and red and green dichroic filters 6, 5, reflected by a reflector 8 and synthesized again by the prism 4 and the synthesized light is projected to a screen 12 through a lens 9. On the other hand, blue light bent at a right angle by the blue dichroic mirror 3 is extinguished by an iris mechanism 10 through a lens 11a and projected to the screen 12 through a lens 11b. Consequently the background color can be controlled to gray close to black and color contrast can be improved.
JP16007787A 1987-06-26 1987-06-26 Large screen display Pending JPS643686A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16007787A JPS643686A (en) 1987-06-26 1987-06-26 Large screen display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16007787A JPS643686A (en) 1987-06-26 1987-06-26 Large screen display

Publications (1)

Publication Number Publication Date
JPS643686A true JPS643686A (en) 1989-01-09

Family

ID=15707375

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16007787A Pending JPS643686A (en) 1987-06-26 1987-06-26 Large screen display

Country Status (1)

Country Link
JP (1) JPS643686A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5024781A (en) * 1989-11-13 1991-06-18 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane, methanol and a mono- or di-chlorinated C2 or C3 alkane
US5026502A (en) * 1990-05-25 1991-06-25 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichoro-1-fluoroethane; dichlorotrifluoroethane; and alkane or cycloalkane having 5 carbon atoms
US5026501A (en) * 1989-12-22 1991-06-25 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; and dichloromethane
US5049301A (en) * 1989-12-20 1991-09-17 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; and methyl formate
US5085796A (en) * 1990-08-15 1992-02-04 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane, ethanol and a mono- or di-chlorinated C2 or C3 alkane
US5120461A (en) * 1990-08-21 1992-06-09 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; methanol; and alkene having 5 carbon atoms
US5122294A (en) * 1990-11-27 1992-06-16 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; ethanol; and alkene having 5 carbon atoms
US5124063A (en) * 1990-12-20 1992-06-23 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; methanol; and alkane having 5 or 6 carbon atoms
US5124064A (en) * 1990-12-19 1992-06-23 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; ethanol; and alkane having 5 or 6 carbon atoms
US5137651A (en) * 1990-12-19 1992-08-11 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane, 1,2-dichloroethylene, and optionally methanol or ethanol
US5190685A (en) * 1990-08-15 1993-03-02 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane, ethanol and cyclopentane
JPH0736116A (en) * 1993-07-19 1995-02-07 Nippon Avionics Co Ltd Overhead projector

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5024781A (en) * 1989-11-13 1991-06-18 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane, methanol and a mono- or di-chlorinated C2 or C3 alkane
US5049301A (en) * 1989-12-20 1991-09-17 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; and methyl formate
US5026501A (en) * 1989-12-22 1991-06-25 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; and dichloromethane
US5026502A (en) * 1990-05-25 1991-06-25 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichoro-1-fluoroethane; dichlorotrifluoroethane; and alkane or cycloalkane having 5 carbon atoms
US5085796A (en) * 1990-08-15 1992-02-04 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane, ethanol and a mono- or di-chlorinated C2 or C3 alkane
US5190685A (en) * 1990-08-15 1993-03-02 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane, ethanol and cyclopentane
US5120461A (en) * 1990-08-21 1992-06-09 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; methanol; and alkene having 5 carbon atoms
US5122294A (en) * 1990-11-27 1992-06-16 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; ethanol; and alkene having 5 carbon atoms
US5124064A (en) * 1990-12-19 1992-06-23 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; ethanol; and alkane having 5 or 6 carbon atoms
US5137651A (en) * 1990-12-19 1992-08-11 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane, dichlorotrifluoroethane, 1,2-dichloroethylene, and optionally methanol or ethanol
US5124063A (en) * 1990-12-20 1992-06-23 Allied-Signal Inc. Azeotrope-like compositions of 1,1-dichloro-1-fluoroethane; dichlorotrifluoroethane; methanol; and alkane having 5 or 6 carbon atoms
JPH0736116A (en) * 1993-07-19 1995-02-07 Nippon Avionics Co Ltd Overhead projector

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