Projection pad incorporating a liquid crystal panel

Claim 2

A projection pad incorporating a transmission type liquid crystal panel (4) for providing a display for projection onto a projection surface, and an axial flow blower (6) for generating an air flow for cooling the panel, characterised in that a space forming an air passageway is provided between the liquid crystal panel and an outer casing (1, 5) of the projection pad by means of protrusions (7) projecting in the direction of the thickness of the liquid crystal panel, and in that a flow path for conveying air within the projection pad is defined by a first port in the outer casing, the axial flow blower, the air passageway and a further port in the outer casing.

Claim 3

A projection pad according to claim 1 charac­terised in that the protrusions are ribs (7a to 7d).

Claim 4

A projection pad according to claim 1 or 2, characterised in that the protrusions are arranged to direct a relatively large proportion of the air flow over a central portion of the liquid crystal panel and a relatively small proportion of the air flow over an outer portion of the liquid crystal panel.

Claim 5

A projection pad according to claim 1, 2 or 3, characterised in that the axial flow blower is arranged to suck in external air and to blow the external air over the liquid crystal panel.

Claim 6

A projection pad according to any of claims 1 to 4, characterised in that a ventilated shield plate (11) is attached to a control circuit (2) of the projection pad for controlling the liquid crystal panel.

Claim 7

A projection pad according to any of claims 1 to 4, characterised in that a remote controller sensor (8) and a control circuit (2) are provided for controlling the liquid crystal panel, and in that the remote controller sensor is an infra-red sensor connected by a wire harness to the control circuit and is thereby placed at a position different from that of the control circuit.

Claim 8

A projection pad characterised by a transmission type liquid crystal panel module (3), a control circuit (2) for controlling said transmission type liquid crystal panel module, an axial flow blower (6), a remote controller sensor (8) and an outer casing (1, 5) as the main constituent elements, in which the trans­mission type liquid crystal panel module is adapted to be placed between a light source and a projection surface whereby the display content on the surface of the liquid crystal panel is projected on said projection surface, and wherein a space in the direction of thickness put between the transmission type liquid crystal panel (4) and the outer casing is formed as a tunnel like space for an air pass way by ribs (7) standing vertically in the direction of the thickness, by which external air is hydro-dynamically communicated through an air path port opened in the outer casing and by way of external air-axial flow blower-tunnel-like space as the air pass way-another air path port.

Claim 9

A projection pad characterised by a transmission type liquid crystal panel module (3), a control circuit (2) for controlling said transmission type liquid crystal panel module, an axial flow blower (6), a remote controller sensor (8) and an outer casing (1, 5) as the main constituent elements, in which the trans­mission type liquid crystal panel module is adapted to be placed between a light source and a projection surface whereby the display content on the surface of the liquid crystal panel is projected on said projection surface, and wherein a space in the direction of thickness put between the transmission type liquid crystal panel (4) and the outer casing is formed as a tunnel like space for an air pass way by ribs (7) standing vertically in the direction of the thickness, by which external air is hydro-dynamically communicated through an air path port opened in the outer casing and by way of external air-axial flow blower-tunnel-like space as the air pass way-another air path port.