Abstract: For obtaining both high brightness under condition of small-sized and simplified structure and suppression of increase in temperature of liquid crystal display elements and polarizing elements, in a liquid crystal display apparatus, comprising: a liquid crystal display element 2 for converting light from a light source into display picture depending on a driving signal; an optical projection system 1b containing a first optical element 1a and for projecting said light signal toward an object of projection; exit side polarizing elements 3b; a holding member 6 for holding them with the liquid crystal display element 2; and cooling medium 5; incident side polarizing elements 3a, wherein, a space is defined by either one of the incident side polarizing elements 3a and the liquid crystal display element 2, the first optical element 1a, between the liquid crystal display element 2 and the first optical element 1a, and the holding member 6, and said space is filled up with the cooling medium 5.

Abstract: A display apparatus having a reflecting type light valve which has a light incidence/reflection surface, a drive circuit which drives the reflecting type light valve by supplying an image signal, a cooling system which cools at least the reflecting type light valve with cooling fluid, and a partition wall which partitions a space in the display apparatus into a cooling fluid side and a light incidence/reflection side. The reflecting type light valve forms a part of the partition wall, and the light incidence/reflection surface faces the light incidence/reflection side and a part opposite to the light incidence/reflection surface of the reflecting type light valve is cooled by the cooling system.

Abstract: A display device, such as a reflecting type liquid crystal projector, in which dust is prevented from becoming attached to a reflecting type light valve, such as a liquid crystal panel, and an improvement in cooling effect are attained. The device has a structure having a partition wall for forming an enclosed space including at least an incidence/emission optical system of the reflecting type light valve. The reflecting type light valve is provided in the partition wall such that a light incidence/emission surface of the light valve faces into the side of the enclosed space. A part opposite to the light incidence/emission surface of the reflecting type light valve faces outside the enclosed space. In a structure where a cooling arrangement or a thermal conductive partition wall is connected to the part opposite to the light incidence emission surface, the cooling effect is further improved.

Abstract: For obtaining both high brightness under condition of small-sized and simplified structure and suppression of increase in temperature of liquid crystal display elements and polarizing elements, in a liquid crystal display apparatus, comprising: a liquid crystal display element 2 for converting light from a light source into display picture depending on a driving signal; an optical projection system 1b containing a first optical element 1a and for projecting said light signal toward an object of projection; exit side polarizing elements 3b; a holding member 6 for holding them with the liquid crystal display element 2; and cooling medium 5; incident side polarizing elements 3a, wherein, a space is defined by either one of the incident side polarizing elements 3a and the liquid crystal display element 2, the first optical element 1a, between the liquid crystal display element 2 and the first optical element 1a, and the holding member 6, and said space is filled up with the cooling medium 5.

Abstract: In order to prevent dust from sticking to the LCD panel, to prevent the LCD panel from being heated and to suitably adjust the position of the LCD panel, a duct is provided between cooling means for a light source and cooling means for a LCD panel to send cooling air from the LCD panel side to the light source side. Therefore, a light incidence/reflection plane of the LCD panel is disposed in an almost hermetically closed space and an optical path from an integrator lens to the LCD panel is formed in the almost hermetically closed space.

Abstract: For obtaining both high brightness under condition of small size and simplified structure, and for achieving suppression of increase in temperature of liquid crystal display elements and polarizing elements in a liquid crystal display apparatus, a liquid crystal display element converts light from a light source into a display picture depending on a driving signal, and an optical projection system contains a first optical element and projects a light signal toward an object of projection. A space is defined by an incident side polarizing element or the liquid crystal display element, the first optical element and a holding member, and the space is filled up with a cooling medium.

Abstract: In order to prevent dust from sticking to the LCD panel, to prevent the LCD panel from being heated and to suitably adjust the position of the LCD panel, a duct is provided between cooling means for a light source and cooling means for a LCD panel to send cooling air from the LCD panel side to the light source side. Therefore, a light incidence/reflection plane of the LCD panel is disposed in an almost hermetically closed space and an optical path from an integrator lens to the LCD panel is formed in the almost hermetically closed space.